45results about How to "Highly integrated design" patented technology

The invention discloses a satellite-borne AIS and ADS-B integrated receiver based on a micro-nano satellite. The satellite-borne AIS and ADS-B integrated receiver sysstem comprises an antenna module,a radio frequency front end module and a digital signal processing module composed of a high-speed analog / digital converter and a system-on-chip SoC, and And synchronous receiving and efficient processing of the AIS and ADS- B signals are achieved. The receiver receives the mixed signals of AIS and ADS-B and performs RF filtering amplification on the signals.; the obtained signal is sent to a signal processing unit and is sampled by a high-speed analog / digital converter; the message is input into a SoC platform to carry out digital down conversion, signal separation and decimation filtering, and frame header burst detection, frequency offset estimation, signal demodulation, data decoding and other processing are carried out on the obtained message and then CRC (Cyclic Redundancy Check) iscarried out, and finally the required AIS (Automatic Identification System) and ADS-B data are obtained. The integrated receiving design is adopted, the size and weight of on-satellite loads and the power consumption of a receiver are effectively reduced, high integration is achieved, and the method is more suitable for being applied to micro-nano satellites.

The invention discloses a small-sized high-pressure self-locking valve. The small-sized high-pressure self-locking valve comprises a valve seat, a valve body, permanent magnets, a valve element, coils, magnetism isolation spacers, a filter, an inlet joint and a casing; the valve seat, the valve body, the valve element, the magnetism isolation spacers, the filter and the inlet joint are sequentially connected with one another from left to right; the valve body adopts a welding integral structure and comprises a lower base, magnetism isolation limiting flanges, magnetism conductive sleeves, magnetism isolation rings and an upper base which are sequentially welded with one another from left to right; the permanent magnets are mounted on the outer sides of bosses of the magnetism conductive sleeves of the valve body respectively; the coils are arranged at grooves formed in the outer sides of the valve body; the casing is in a cylinder shape and is assembled by being matched with the upper base and the lower base of the valve body; regulation spacers are symmetrically arranged on two sides of the valve element; the left ends of the regulation spacers are abutted against the valve seat; and the right ends of the regulation spacers are abutted against the magnetism isolation limiting flanges and the magnetism conductive sleeves respectively. Through adoption of the small-sized high-pressure self-lock valve, magnetic circuit design is highly integrated, the service life of the valve is prolonged, and the sealing performance of the valve is improved.

The invention provides an electric cooker, a cooker cover and a covering plate fixing mechanism of the electric cooker. The covering plate fixing mechanism comprises a left locking block, a locking block spring, a lever, a connecting rod and a right locking block, wherein the left locking block and the right locking block are arranged oppositely; one end of the lever is hinged with one end of the connecting rod; a first side face of the other end of the lever props against the left locking block; the other end of the connecting rod is hinged with the right locking block; the linkage connection in opposite movement directions between the left locking block and the right locking block is realized through the connecting rod and the lever; and the locking block spring is arranged in the movement direction of the left locking block and props against a second side face of the other end of the lever. According to the covering plate fixing mechanism, because of the double hinging of the lever and the connecting rod, the synchronous linkage of the left locking block and the right locking block in opposite directions is realized. The detachable fixation of a covering plate is realized through the covering plate fixing mechanism of the electric cooker and the cooker cover.

The invention relates to an FPGA-based radar signal processing teaching platform and a working method thereof. The platform comprises a display control computer, a radar echo simulation module, a radar signal processing module and an oscilloscope. The working method comprises the steps that radar signal configuration information is set through the display control computer and sent to the radar echo simulation module; the radar echo simulation module generates a corresponding radar echo intermediate frequency signal according to the configuration information; the radar signal processing modulereceives a radar echo intermediate frequency signal; radar detection target signals are extracted through processing and sent to the display control computer to be processed to obtain a simulation oscillogram; the oscilloscope displays waveforms of radar echo intermediate frequency signals and waveforms of the radar detection target signals, and the simulation oscillogram obtained by the display control computer is compared with the oscillogram displayed by the oscilloscope. Parameter configuration is flexible and simple, the radar signal processing process is visual, radar signal processing methods are diversified, and the requirements of different teaching users can be met.

The invention relates to the technical field of electric vehicle warning tone systems, in particular to an electric vehicle low speed warning tone system based on a vehicle-mounted acoustic navigationsystem. The electric vehicle low speed warning tone system comprises a CAN circuit, an MCU circuit and a DSP circuit; the CAN circuit is used for real-time acquisition of an electric vehicle traveling speed, the MCU circuit is used for determining that when the driving speed is lower than preset speed, a control signal is output, and the DSP circuit performs audio decoding processing on pre-stored warning tone data according to the control signal, and outputs a warning audio signal. According to the electric vehicle low speed warning tone system based on the vehicle-mounted acoustic navigation system, the electric vehicle low speed warning tone system is integrated into a conventional vehicle-mounted acoustic navigation system, compared with an existing independently arranged low speed warning tone system, the integration level is higher, cost is lower, complexity in system design is reduced, and more energy conservation is achieved.

The invention discloses a three-dimensional daisy chain topology by aiming at multi-load DDRX (Double Data Rate) interconnection. By use of the topology, the nonideal effect of an interconnection linkcan be lowered, and signal transmission quality is improved. On the basis of the three-dimensional space structure of the DDRX, two classes of routing layers, including a routing layer A and a routing layer B, are alternately arranged in the DDRX, wherein the routing layer A and the routing layer B are independently next to a surface layer and a bottom layer; and a signal flows through each loadthrough the routing layer A and the routing layer B in sequence, and the effective combination of a through hole and a transmission line in the three-dimensional DDRX space are utilized for reducingthe length of each load branch line so as to effectively reduce reflection among multiple load branch lines, reduce the influence of an nonideal effect and improve signal transmission quality. In addition, processing is carried out through a through hole backdrill and keep out to further reduce the own nonideal effect of the through hole.

The invention relates to a transformer isolation driving method with an adjustable space width range and duty ratio. A first-way transformer isolation circuit and a second-way transformer isolation circuit connected with each other are adopted to output drive signals with a 0% to 100% duty ratio; each transformer isolation circuit comprises a totem-pole circuit for enhancing the drive capability of input drive signals; a pulse transformer connected with an output end of the totem-pole circuit through a circuit, and is used for performing signal isolation on the drive signals with enhanced drive capability; output ends of the pulse transformers of two ways of transformer isolation circuits are connected with a first resistor in series respectively through a first triode, and the output endsof the pulse transformers of two ways of transformer isolation circuits are further connected to a grid electrode and a source electrode of a switching tube MOSFET respectively. According to the transformer isolation driving method with the adjustable space width range and duty ratio provided by the invention, two ways of transformer isolation circuits are adopted, so that the drive signals withthe 0% to 100% duty ratio can be output; and the transformer isolation driving method has high integration level and meets the requirements of the space exploration field.

The invention discloses an excavation vertical frame lifting and placing vehicle. The excavation vertical frame lifting and placing vehicle comprises a vehicle main body, guide rails, vertical frame bearing trolleys and lifting devices; a stretchable platform is installed at the upper end of the vehicle main body in a stretchable mode, and a jacking mechanism is connected to the stretchable platform; and the lifting devices are used for lifting a vertical frame and sending the lifting frame to the vertical frame bearing trolleys; the vertical frame bearing trolleys are installed on the guide rails and can transversely move so as to convey the vertical frame along the guide rails, the vertical frame bearing trolleys are connected with translation driving mechanisms, and the translation driving mechanisms can drive the vertical frame placed on the vertical frame bearing trolleys to transversely move and can convey the vertical frame to the position above the jacking mechanism in the retraction state. The excavation vertical frame lifting and placing vehicle has the advantages that the integration degree is high, the installation automation degree is high, the erection efficiency of the vertical frame is high, the manual operation is reduced, and the potential safety hazard of construction is reduced.

The invention provides an AC charging pile controller based on a K64 single-chip microcomputer and an MQX operating system. The controller comprises a main control board, a signal interface board, a power source board, a mother board and a cabinet, wherein the main control board is further provided with a USB interface, a CAN interface, an RS485 interface, an Ethernet interface, multiple wirelesscommunication board interfaces and a man-machine interaction board interface. The controller is advantaged in that in the device type selection aspect, industrial stable reliable commonly-used large-factory chips are selected, in the principle and PCB design aspect, multi-orientation optimization is carried out for EMC and reliability problems, the aspects of the controller are greatly improved, and functions and reliability are greatly improved.

The invention discloses a power supply circuit for a cable comprehensive test. The power supply circuit comprises a negative polarity high-voltage power supply circuit which comprises a first adjustable high-frequency alternating-current power supply, a first high-frequency high-voltage transformer, a first resistor group, a first capacitor group, a first light-operated semiconductor switch group and a first high-voltage silicon stack group; the positive polarity high-voltage power supply circuit comprises a second adjustable high-frequency alternating-current power supply, a second high-frequency high-voltage transformer, a second resistor group, a second capacitor group, a second light-operated semiconductor switch group and a second high-voltage silicon stack group; the voltage-dividing coupling unit comprises a third resistor group and a third capacitor group; the dielectric loss measuring unit comprises a divider resistor group, a current transformer, an acquisition card and an industrial personal computer; and the current transformer is electrically connected with one end of the cable to be detected. The technical problems that a mechanical switch in an existing topology circuit is large in reversing noise, poor in high-voltage resistance and low in circuit integration degree, consequently, the actual operation efficiency is poor, and the comprehensive requirement for detection of various states cannot be met can be solved.

The invention provides an ammonia spraying grating intelligent optimization and adjustment system and method for an SCR denitration device and belongs to the technical field of control over atmospheric pollutants discharged by coal-fired boilers. The ammonia spraying grating intelligent optimization and adjustment system for the SCR denitration device comprises a flue gas flow distribution detection system, a flue gas distribution concentrated sampling system I, a flue gas analyzer I, an ammonia spraying grating, a catalyst layer, a flue gas distribution concentrated sample system II, a flue gas analyzer II and an intelligent control system. The flue gas flow distribution detection system, the flue gas distribution concentrated sampling system I and the flue gas analyzer I are arranged in an SCR inlet flue, the ammonia spraying grating and the catalyst layer are arranged in an SCR reactor in sequence, and the flue gas distribution concentrated sample system II and the flue gas analyzer II are arranged in an SCR outlet flue. By means of the ammonia spraying grating intelligent optimization and adjustment system and method for the SCR denitration device, intelligent control over ammonia spraying optimization and adjustment, and wireless transmission for flue gas low detection and ammonia spraying flow detection are achieved, the ammonia spraying amount is controlled in the whole process, excessive ammonia spraying is effectively avoided, the testing efficiency and data effectiveness are improved, and the whole system is high in design integrity and portability.

The invention belongs to the technical field of mechanical test equipment and method, and relates to a double-tool-rest reliability test device based on combined loading. The double-tool-rest reliability test device comprises two tool rests, a double-tool-rest mounting table device, a combined loading device, a control cabinet, a data acquisition box, and a control console. The two tool rests are mounted on the double-tool-rest mounting table device, and are driven by a servo motor to move along a guide rail. The combined loading device is disposed on the double-tool-rest mounting table device and arranged between the two tool rests, and are used for applying a load to the two tool rests at the same time and detecting the performance of the tool rests. Switching between an ordinary tool bit loading mode and a dynamic tool bit loading mode is realized by means of hierarchical automatic switching, wherein ordinary tool bit loading is based on a direction-adjustable piezoelectric ceramic loading mechanism, and dynamic tool bit loading is based on the mutual support principle of two dynamic tool bits and a bending moment and vibration loading structure. The working conditions of two tool rests are detected simultaneously by one set of image detection mechanism, and the device has a high degree of integration and automation.

The invention discloses a wearable fracture reduction and rehabilitation robot control system and method. The wearable fracture reduction and rehabilitation robot control system comprises an upper computer software module, a communication module, a force sensor module, an embedded driver module and a motor module. A mechanism kinematics forward and inverse solution algorithm and a trajectory planning algorithm are embedded in the upper computer software module, a multi-thread communication mode of RS485 serial communication and USB-to-CAN bus communication is adopted, hardware of the embedded driver module is composed of a control circuit and a driving circuit, and a power supply chip, a driving chip, a communication chip and a control chip are integrated on the same control circuit board. The control system driver is high in hardware design integration level, and the requirements for miniaturization and convenience are met; meanwhile, the development difficulty is low, and an upper computer can issue a control instruction through a simple serial port protocol; the driver adopts a driving and control integrated design, and the motor bottom layer control real-time performance is high; and integrated control of fracture reduction and rehabilitation can be realized.

The invention discloses a high pressure water pump. The high pressure water pump comprises a pump body, and a left end cover is fixedly installed at the left end of the pump body and a right end coveris fixedly installed at the right end of the pump body. A piston body is slidably connected into the pump body. A left pump case is fixedly installed on the left side of the left end cover, and a left sealing cover is fixedly installed at the left end of the left pump case. A right pump case is fixedly installed on the right side of the right end cover, and a right sealing cover is fixedly installed at the right end of the right pump case. A left connecting rod is fixedly installed at the left end of the piston body, and a right connecting rod is fixedly installed at the right end of the piston body. A left piston is arranged at the left end of the left connecting rod, and a right piston is arranged at the right end of the right connecting rod. A P oil port and a T oil port are formed inthe outer side surface of the pump body. The piston body is internally provided with a control component for controlling the piston body to move left and right in a mounting hole. The high pressure water pump is simple in structure and small in size, and can control the automatic back and forth movement of the piston body without electric control.

The invention belongs to the field of multi-frequency-band antennas, particularly relates to a miniaturized wide-beam multi-frequency fusion receiving and transmitting integrated Beidou antenna based on bent oscillators, and aims to solve the problems that an existing multi-frequency-band Beidou antenna is complex in structure, low in low-elevation gain, poor in circular polarization axial ratio and low in positioning precision. According to the antenna, a Beidou antenna feed circuit sends out corresponding radio frequency signals through a B1 / B2 / B3 radio frequency port, an L radio frequency port and an S radio frequency port; the S radio frequency port is arranged at the center of the Beidou antenna feed circuit, and the B1 / B2 / B3 radio frequency port and the L radio frequency port are symmetrically arranged at two side edges of the Beidou antenna feed module by taking the S radio frequency port as a center; and an antenna array comprises a first bent array, a second bent array, a third bent array and a fourth bent array, and the bent arrays are selectively and symmetrically distributed around the S radio frequency port as the center at a set distance and a set angle and are used for receiving / transmitting corresponding radio frequency signals. The miniaturized wide-beam multi-frequency integrated receiving and transmitting Beidou antenna is realized through sharing of the bent array and left and right-hand circular polarization.

The invention proposes a design method for converting a PCI bus into an ISA and an APB bus, and solves the problem that a processor in an embedded computer system cannot simultaneously access devices conforming to the ISA parallel bus protocol. The technical scheme that the present invention takes comprises: PCI bus interface 1 receives the PCI bus configuration instruction from PCI bus, sends described PCI bus configuration instruction to PCI instruction analysis control module 2; PCI instruction analysis control module 2 from PCI bus configuration instruction The register address and register storage address are resolved and sent to the PCI bus configuration register module 3; the PCI configuration register processing module 3 writes the register address into the PCI control register corresponding to the register storage address in the PCI bus configuration register module 3.

The invention relates to a harmonic suppression metasurface energy collector which is characterized by comprising a metasurface unit layer, a grounding layer and a radio frequency output layer which are sequentially arranged from top to bottom, wherein a plurality of metasurface units are periodically arranged on the metasurface unit layer; the metasurface units are the same in structure, and each metasurface unit comprises a dielectric substrate and a metal layer arranged on the dielectric substrate; umbrella-hook-shaped groove structures used for achieving incident wave absorption and L-shaped groove structures used for achieving harmonic suppression are etched on the metal layer; a vertical conductive through hole penetrating through the metasurface unit layer is formed in each umbrella-hook-shaped groove structure, and each metasurface unit is connected with a feed network arranged on the radio frequency output layer after passing through the grounding layer through each conductive through hole, and the collected radio frequency energy is transmitted to the feed network for radio frequency synthesis, so that all energy is converged to one place to be exported. The harmonic suppression metasurface energy collector can be widely applied to the field of rectification antenna design.

The invention relates to the technical field of open unmanned supermarkets, and discloses a construction method of a self-service unmanned intelligent selling shop, which comprises a selling central control system, system connection and shop installation, the selling central control system adopts a mode of an Android system and a lower computer, and an electronic system is divided into three standard modules: an upper computer, the lower computer and a PLC servo motor. The Android mainboard adopts an ARM framework SOC chip design, onboard 4G full-network communication is achieved, the goods channel control mainboard adopts an STM32 single-chip microcomputer design, and a conveying system is executed by a servo motor controlled by a PLC. According to the construction method of the self-service unmanned intelligent selling shop, an electronic system is divided into three standard modules including the upper computer, the lower computer and the PLC servo motor, the design integration degree is high, adaptation is flexible, the comprehensive research and development manufacturing cost is low, the construction method is suitable for various selling scenes, functional standardized accessories are applied, adaptation is flexible, transportation is convenient, maintenance is easy, and the shop opening time is greatly shortened.

An integrated three-dimensional liquid cooling pipe network flow distribution device comprises a distribution assembly, at least one flow adjusting assembly, a liquid supply adapter and a liquid return adapter, the distribution assembly comprises a liquid supply collection cavity and a liquid return collection cavity, the liquid supply collection cavity comprises a plurality of liquid supply ports used for being connected with an integrated pipe network, and the liquid return collection cavity comprises a plurality of liquid return ports connected with the integrated net pipe; the liquid supply adapter is connected with the distribution assembly and is communicated with the liquid supply collecting cavity, and the liquid return adapter is connected with the distribution assembly and is communicated with the liquid return collecting cavity; and the flow adjusting assembly is connected to the distribution assembly. The flow distribution device has the beneficial effects that the flow distribution and liquid cooling pipe network integrated design can be realized, the requirement of a radar distribution pipe network on the array space is reduced, and the light, thin and high-integration design of the array is realized; and through the flow regulation assembly, flow regulation of the integrally formed liquid cooling pipe network can be realized.

The invention discloses a high-pressure water pump. A cylinder is included. At least three piston holes are sequentially formed in the right end of the cylinder with the axis of the cylinder as the center at equal intervals. A piston body is in sliding connection in each piston hole. A right end cover is fixedly arranged at the right end of the cylinder, water pumping assemblies are arranged in the right end cover, and each water pumping assembly is driven by the piston body corresponding to the water pumping assembly. A flow distribution shaft is arranged at the center position of the left end of the cylinder, a left end cover is fixedly arranged at the left end of the flow distribution shaft, and the flow distribution shaft is rotationally connected with a flow distribution disc. A firstflow distribution hole and a second flow distribution hole are formed in the right end face of the flow distribution disc. A cavity is formed in each piston hole, and an oil hole is formed in the left end face of the cylinder. The outer side of the cylinder is rotationally connected with a rotation barrel, and the left end of the rotation barrel is fixedly connected with the flow distribution disc. The integral design of the high-pressure water pump is highly integrated, space and components are saved, pressure output is free of pause, pulsation cannot be generated, and in addition, electriccontrol is not needed.

The invention discloses a high-pressure water pump which comprises a pump body. An left-right through installation hole is formed in the pump body, a left end cover is fixedly installed at the left end of the pump body, a right end cover is fixedly installed at the right end of the pump body, a left pump shell is fixedly installed on the left side of the left end cover, and a right pump shell is fixedly installed on the right side of the right end cover. The installation hole is provided with a piston body moving left and right, the left end of the piston body is provided with a left connecting rod which penetrates through the left end cover to stretch into the left pump shell, the right end of the piston body is provided with a right connecting rod which penetrates through the right end cover to stretch into the right pump shell, the left end of the left connecting rod is provided with a left piston, the right end of the right connecting rod is provided with a right piston, the left end of the left pump shell is provided with a left inlet one-way valve and a left outlet one-way valve, and the right end of the right pump shell is provided with a right inlet one-way valve and a right outlet one-way valve. The outer side face of the pump body is provided with a port P1, a port T1, a port P2 and a port T2. A control assembly is arranged in the installation hole. The high-pressurewater pump is simple in structure, small in size, simple in driving way and free of electric control.

The invention discloses a reaction cup grabbing and placing device for an immunity analyzer, and belongs to the field of in-vitro diagnosis medical instruments. A reaction cup grabbing and placing device for an immunity analyzer comprises a fixing box, the output end of a motor penetrates through the outer wall of the fixing box, extends into the fixing box and is sleeved with a cam, the left end of an output shaft of the motor is sleeved with a notch disc, and a limiting inclined rod is arranged at the front end of the left side of a rocker arm; a plurality of arc-shaped grooves are annularly formed in the outer wall of the bottom surface of the arc-shaped block at equal intervals, a plurality of square grooves are annularly formed in the outer wall of the bottom surface of the arc-shaped block at equal intervals, an ejector rod is rotationally connected into a groove in the lower side of the front end of an adjusting rod through a pin shaft, and the structures are tightly matched, so that the device can continuously clamp a reaction cup and move in a reversing manner; the clamping efficiency is improved, the arc-shaped grabbing and releasing rod can grab and release the reaction cup stably and quickly, it is ensured that an instrument operates reliably and quickly, manpower and material resources are effectively saved, and cross contamination is avoided.

The invention discloses a double-plunger supercharger. The double-plunger supercharger comprises a machine body, wherein a mounting hole is formed in the machine body; a port P and a port T which communicate with the mounting hole are formed in the side surface of the machine body; a left end cover is mounted on the left side of the machine body, and a right end cover is mounted on the right sideof the machine body; the left end cover comprises a left body; a left first convex column is arranged on the left body; a left second convex column is arranged at the right end of the left first convex column; the right end cover comprises a right body; a right first convex column is arranged on the right body; a right second convex column is arranged at the left end of the right first convex column; a cylinder sleeve is slidably connected in the mounting hole; a power piston is slidably connected in the cylinder sleeve; a left piston cavity is formed between the left end of the power piston and the left second convex column in the cylinder sleeve, and a right piston cavity is formed between the right end of the power piston and the right second convex column in the cylinder sleeve; a leftpump assembly is arranged in the left end cover; and a right pump assembly is arranged in the right end cover. The double-plunger supercharger is highly integrated in integral design, space and partsare saved, moreover, oil ways are reduced, control is simple, and in addition, electric control is not required.

The invention relates to a method for realizing take-off-landing-movement of a lunar probe, belonging to the technical field of take-off and landing of a lunar probe. The capillary gap reserved in the forming process of the structural plate is used as the flow pipeline of the thermal control working medium to realize the reuse of the structural plate and the heat pipe; multiple thrusters are arranged to provide the lunar probe for take-off and soft landing on the lunar surface The thrust in the process, and the control in the flight process, realize the integrated design of the propulsion and control functions; the three-dimensional design of the thermal control multi-layer spacer layer improves its thermal insulation performance, so that the detector can adapt to a lower ambient temperature; The active control of the motor realizes that the lunar probe can withstand the impact of multiple landing buffers; the control motor is used to control the extension and rotation of the landing buffer mechanism to realize the movement of the lunar probe.

The invention discloses a reciprocating plunger pump, which comprises a pump body, and the pump body is provided with mounting holes penetrating left and right; the left end of the pump body is fixedly installed with a left end cover, and the right end is fixedly installed with a right end cover; the left end A left pump casing is fixedly installed on the left side of the cover, and a right pump casing is fixedly installed on the right side of the right end cover; the mounting hole is provided with a piston body that moves left and right, and the left end of the piston body is provided The left connecting rod that enters the left pump casing, the right end is provided with the right connecting rod that passes through the right end cover and extends into the right pump casing, the left end of the left connecting rod is provided with a left piston, and the right end of the right connecting rod is provided with a right piston; The left end of the left pump casing is provided with a left inlet check valve and a left outlet check valve, and the right end of the right pump casing is provided with a right inlet check valve and a right outlet check valve; There are P1 port, T1 port, P2 port and T2 port; the installation hole is provided with a control component; the reciprocating plunger pump not only has a simple structure and a small volume, but also has a simple driving method and does not require electronic control.

The invention discloses a double-plunger supercharger, which comprises a machine body, a mounting hole is arranged in the body, a P port and a T port communicated with the mounting hole are arranged on the side of the body; the left side of the body is installed There is a left end cover, and a right end cover is installed on the right side; the left end cover includes a left body, the left body is provided with a left post, and the right end of the left post is provided with a left two post; the right end cover includes a right body, a right The body is provided with a right convex column, and the left end of the right convex column is provided with a right two convex column; a cylinder liner is slidably connected in the installation hole; a power piston is slidably connected in the cylinder liner; A left piston chamber is formed between the left end of the power piston and the two left convex posts, and a right piston chamber is formed between the right end of the power piston and the two right convex posts; Pump assembly; the double plunger supercharger is not only highly integrated in overall design, saving space and parts, but also reduces oil passages, simple control, and no need for electric control.

The invention provides a phase shifter and a base station antenna. The phase shifter comprises a substrate, a fixed circuit and a phase shift circuit, wherein the fixed circuit and the phase shift circuit are arranged on the substrate; the fixed circuit comprises an input end and an output end which are separated from each other; the two ends of the phase shift circuit are coupled with the input end and the output end respectively; and the phase shift circuit can rotatably switch the coupling connection position between the phase shift circuit and the input end and the coupling connection position between the phase shift circuit and the output end relative to the substrate. According to the phase shifter provided by the invention, the coupling connection positions between the phase shifting circuit and the input end / the output end can be switched by driving the phase shifting circuit to rotate, so that the circuit length from the input end to the output end is adjusted, and phase adjustment from the input end to the output end is realized; the overall structure is simple and compact, other spaces around the phase shifter are not occupied in the phase shifting adjustment process, and miniaturization design is achieved; and the overall layout of a base station antenna can be simplified when the phase shifter is applied to the base station antenna, and the design integration degree of the antenna is improved so that antenna miniaturization can be achieved.

The invention discloses an air compressor. The air compressor comprises a machine body, wherein at least three axial holes are formed in the machine body, a left end cover is fixedly arranged on the left side of the machine body, and a right machine shell is fixedly arranged on the right side of the machine body; a piston body is slidably connected in each axial hole, and the right side of each piston body is provided with a piston rod in an extending mode; pumping assemblies corresponding to the axial holes in one-to-one correspondence are arranged in the left end cover; the right side of themachine body is provided with a first concave spherical groove, and the right machine shell is provided with a second concave spherical groove; oil holes are formed in the machine body; the side surface of the right machine shell is provided with a P port and a T port; a rotating block is rotationally connected in the right machine shell, a rotating groove is formed in the left end of the rotating block in the direction perpendicular to the inclined plane, and a flow distribution shaft is rotationally connected in the rotating groove; and the lateral surface of the outer circumference of theflow distribution shaft is provided with a convex edge in the radial direction, and the right end of each piston rod is hinged to the convex edge through a ball. The air compressor has the advantagesthat the structure is compact, the overall design is highly integrated, a motor is not needed, electric instability factors are avoided, the air compressor can work for a long time, and the service life is long.

The invention discloses an air compressor, which comprises a body, and the body is provided with left and right through installation holes; the left end of the body is fixedly installed with a left end cover, and the right end is fixedly installed with a right end cover; the left side of the left end cover is The left pump casing is fixedly installed, and the right pump casing is fixedly installed on the right side of the right end cover; the installation hole is provided with a piston body that moves left and right, and the left end of the piston body is provided with a Inside the left connecting rod, the right end is provided with the right connecting rod that passes through the right end cover and extends into the right pump housing, the left end of the left connecting rod is provided with a left piston, and the right end of the right connecting rod is provided with a right piston; the left pump The left end of the casing is provided with a left-inlet one-way valve and a left-outlet one-way valve, and the right end of the right pump casing is provided with a right-inlet one-way valve and a right-outlet one-way valve; the outer surface of the body is provided with a P1 port, T1 port, P2 port, T2 port; control components are arranged in the installation holes; the air compressor is not only simple in structure, small in size, but also simple in driving mode, without electronic control.

The invention relates to a harmonic suppression metasurface energy collector, which is characterized in that it comprises: a metasurface unit layer, a grounding layer and a radio frequency output layer arranged sequentially from top to bottom; the metasurface unit layer is arranged periodically There are several metasurface units; each of the metasurface units has the same structure, including a dielectric substrate and a metal layer arranged on the dielectric substrate, and the metal layer is etched with an umbrella-shaped groove for realizing incident wave absorption structure and an L-shaped slot structure for realizing harmonic suppression; each said umbrella hook-shaped slot structure is internally provided with a vertical conductive via hole that runs through said metasurface unit layer, and each said metasurface unit passes through each said conductive via The hole passes through the ground layer and is connected to the feed network provided on the radio frequency output layer, and transmits the collected radio frequency energy to the feed network for radio frequency synthesis, so that all the energy is gathered in one place and exported. The invention can be widely used in the field of rectenna design.