274results about How to "Realize on-off" patented technology

The invention discloses an automatic testing device and method universally used for multiple bus processor modules. The automatic testing device comprises a power supply unit, wherein the power supply unit is connected with an industrial personal computer, a programmable oscilloscope, a programmable power supply and a signal acquisition subdevice; the industrial personal computer is connected with an equipment access box, an equipment adapter box is respectively connected with a multimeter and a digital I / O (Input / Output) control panel, the power supply input end of the equipment adapter box is connected with the power supply output end of the programmable power supply; the industrial personal computer is connected with the programmable oscilloscope, the programmable power supply and a communication board; and the programmable oscilloscope and the programmable power supply are connected with the equipment adapter box. The invention mainly realizes portable mechanical loading of different types of different bus processor modules, automatic loading of closed test programs, automatic testing of performances and breakage and short circuit property tests of all pins of the module. By using test hardware of the automatic testing device and matching developed test software, automatic recognition of the processor modules, automatic loading of the closed test programs, real-time display of performance test results, report output and other functions can be realized.

The DC mixed contactor reliability lifetime experiment dynamic feature testing analysis system relates to the DC mixed contactor reliability lifetime experiment dynamic feature testing analysis device, in order to solve the problem of the existing contactor reliability lifetime experiment testing device that the experimental data is incomplete acquisition, inaccurate, and unable to collect and transmit real-time for the data. The invention includes front-end processing module, data acquisition module, data transmission module, upper position computer and LCD display and keyboard, and the signal output of the front-end processing module connecting with the signal input of the data acquisition module, the data output of the data acquisition module connecting with the data input of the data transmission module, the data transmission end of the data transmission module connecting with the upper position computer and LCD display and keyboard. The invention achieves the full automation of the experiment, improves the precision of data analysis; it can completely and fully analyze the data.

The invention provides an automatic testing system of a non-linear thermal parameter of a high-power microwave device and a testing method thereof. The testing system comprises a control circuit module and a microwave circuit module. During a testing process, a vector network analyzer provides a signal source; connection with a correlated port of a microwave testing system is realized; and an MFC program is compiled by using a Microsoft Visual Studio 2012 to control a control circuit part of the system and obtain and display instrument testing data. With the Labview, adata collection program is complied for a six-port amplitude and phase testing module reserved in the system, thereby realizing automatic testing of a non-linear thermal parameter of a high-power microwave device. According to the invention, automatic switching of the testing circuit is realized; and in the testing system, the interface is reserved for the six-port amplitude and phase testing module, so that the cost of phase and amplitude testing of the high-power microwave device is reduced. An objective of automatic testing of a non-linear thermal parameter of a high-power microwave device within a broadband of 2G to 18G can be achieved. The system and method have characteristics of broadband, great convenience, rapidness, and high accuracy.

The invention provides a microfluidic valve and a microfluidic chip. The microfluidic valve comprises a base, a sleeve, a rotor and micro-columns, wherein the base is provided with micropores; the sleeve is arranged on the base; the rotor is rotatablely sheathed on one end of the sleeve away from the base; the rotor, sleeve and base are matched to form a stirring cavity; the micropores can be communicated with the stirring cavity; and the micro-columns are arranged on the rotor and positioned in the stirring cavity, and can seal the micropores. The microfluidic valve provided by the invention can implement the on-off state of the micropores on the base through the rotation of the rotor, and can also implement stirring and mixing on the liquid in the stirring cavity; and therefore, the microfluidic valve has the functions of flow path on-off and fluid stirring, thereby reducing the number of components installed on the microfluidic chip and further being convenient for assembly.

The invention discloses a high-voltage direct-current circuit breaker based on double switches. The high-voltage direct-current circuit breaker comprises a semi-conductor switch tube, a switch tube control optocoupler, a switch tube control resistor, an isolation power supply, a relay control resistor, a relay control optocoupler and a double-pole double-throw relay. The semi-conductor switch tube is connected with a positive end of a high-voltage direct-current power transmission line in series. The double-pole double-throw relay has two accesses, one access is connected with the positive end of the high-voltage direct-current power transmission line in series and connected behind the semi-conductor switch tube in cascade mode, and the other access is connected with a negative end of the high-voltage direct-current power transmission line in series. The output ends of the two accesses of the double-pole double-throw relay are respectively the output positive end and the output negative end of the high-voltage direct-current power transmission line. Connection and disconnection of the semi-conductor switch tube are controlled by the switch tube control optocoupler, and connection and disconnection of the two accesses of the double-pole double-throw relay are controlled by the relay control optocoupler. The circuit breaker is small in size, fast in connection and disconnection, free of leakage current and safe and reliable to use.

The invention discloses a temperature control unit based on shape memory alloy. One end of the temperature limiter shape memory alloy of a temperature control switch of the temperature control unit is bonded to a heat conduction top cover, and the other end of the temperature limiter shape memory alloy is connected with an insulating sheet. A first conducting strip is bonded below the insulating sheet, and a base of the temperature control switch is formed by integrally connecting a cylindrical hollow structure and a bottom disc. The insulating sheet, the first conducting strip and the temperature limiter shape memory alloy are arranged in the cylindrical hollow structure. The cylindrical surface of the base is provided with an opening, and a conducting strip of the temperature control switch is embedded into the opening. The base of the temperature control switch is an insulator, the bottom of the first conducting strip in a temperature limiter is provided with a round piece, the bottom of the first conducting strip is connected with a lever, and the lever is connected with a button of a temperature control unit application device. The temperature limiter shape memory alloy is one-way shape memory alloy. By means of the shape memory alloy, the temperature control unit has the advantages of being high in stability, simple, safe, high in control precision, high in response speed and the like.

The invention discloses a household intelligent controller and a control method thereof. The household intelligent controller comprises a master control chip (1), an infrared sensor (2), a counter (3), a timer (12) and an alternating-current touch switch (4), wherein the infrared sensor (2), the counter (3), the timer (12) and the alternating-current touch switch are electrically connected with the master control chip (1), and the infrared sensor (2) is two pairs of infrared transmission receivers. The controller also comprises a light sensor (13), and the light sensor (13) is electrically connected with the master control chip (1). The household intelligent controller can effectively judge whether people exist in a room or not, and the intelligent control over indoor electrical equipment or power supplies is realized. The intelligent degree is high, the practicality is strong, and the reliability of the controller is very high through accurate count and control. In addition, with the arrangement of the timer and the light sensor, the regulation flexibility of the controller is increased, and the controller is more intelligent and energy-saving. The on and off of the power supplies within a certain time is realized.

The invention discloses a vehicle detector, a method for intermittent and variable-frequency power supply, and a method for reducing the power consumption of a wireless transceiver module, and relates to the technical field of vehicle detection. According to the vehicle detector provided by the invention, a microcontroller controls a power supply control chip through a power control pin to realize on-off and on-off frequency change of a magnetic resistance sensor and an ADC module and further realize intermittent and variable-frequency power supply to the magnetic resistance sensor. Thus, high-accuracy vehicle speed detection under high-frequency ADC sampling is ensured, and the situation in which waste of power is caused due to the adoption of high-frequency intermittent power supply when a vehicle has not arrived is avoided. According to the vehicle detector provided by an embodiment of the invention, the power consumption is reduced through intermittent power supply and variable-frequency power supply, and the accuracy of vehicle arrival detection signals is improved through variable-frequency power supply. In addition, by distributing the time length of timed data uploading to each vehicle detector, the power consumption of wireless transceiver modules is greatly reduced, and the battery life and the effective working time of the vehicle detectors are prolonged.

The invention provides a water supply device, a refrigerator and an ice maker with the same. The water supply device comprises a water storing part and a water pumping part; the water pumping part is provided with a water pump; the water inlet end of the water pump is connected with a water pumping pipeline; the water outlet end of the water pump is connected with a water supply pipeline; the water pumping pipeline is connected with the internal part of the water storing part; and a one-way valve is arranged in the water pumping pipeline. A one-way valve is arranged in the water pumping pipeline connected with the water bump according to the water supply device provided by the invention, so the one-way valve can respond to the change of working state of water pump immediately without being influenced by other factors. Therefore, the on and off of water in the water pumping pipeline is more effectively and accurately implemented for preventing from over-flowing of water. The refrigerator and the ice maker provided by the invention are provided with the above water supply system, which can effectively prevent water from overflowing out of the ice maker. Consequently, the safety and reliability of ice making system of the refrigerator and the ice maker are improved.

The invention discloses a mobile terminal antenna device, and relates to the technical field of communication antennas. The mobile terminal antenna device comprises a first radiator; the first radiator is connected with the first signal output end of a processor through a signal source; one end of a second radiator is connected with the first radiator through a switch circuit, and the other end ofthe second radiator is grounded through a first active switch; and the second signal output end and the third signal output end of the processor are connected with the control signal input ends of the switch circuit and the first active switch respectively. Through the tuning design of a multi-antenna body by the switch circuit, the design that the parasitic frequency band is tunable, the antennaradiators are reconfigurable and multiple antennas are compatible in a low-radiation environment is realized, and multiple tunable schemes can be provided in a parasitic antenna and reconfigurable radiator mode, so that the broadband / multi-frequency design of the antennas and the near-distance high-isolation design of the multiple antennas are realized.

The invention discloses a high-pressure waste energy recovery hydraulic turbine test stand and control method thereof, which belongs to the field of measuring equipment. The relevant experiment platform and the control method thereof are provided for a high-pressure waste energy recovery hydraulic turbine. The test stand mainly comprises the hydraulic turbine, a generator, an inverter motor, a high-pressure piston pump, a relief valve, an electric control valve, a heating device, a turbine flow meter, a temperature sensor, a pressure transmitter, a pressure gauge, a pool and a torque tachometer. Compared with an ordinary test stand, the high-pressure waste energy recovery hydraulic turbine test stand has the advantages that automatic relevant component control and automatic information collection are realized; pressure, flow and other parameters are adjustable in a turbine running process; the working condition of the turbine can be efficiently recorded and the working characteristics are analyzed; and the research and the development of the novel high-pressure waste energy recovery hydraulic turbine are convenient.

The invention provides an intelligent self-priming pump. The intelligent self-priming pump comprises a power input end, a main winding branch circuit and a secondary winding branch circuit. The main winding branch circuit and the secondary winding branch circuit are connected to the power input end in parallel. The secondary winding branch circuit comprises a secondary winding coil L2 and a working capacitor C and is formed by connecting the working capacitor C and the secondary winding coil L2 in series. The main winding branch circuit comprises a main winding coil L1. The intelligent self-priming pump is characterized by further comprising a control circuit; a relay KM is arranged on the control circuit; a normally-open contact of the relay KM is connected to the power input end of the pump so as to control power on-off of the pump. By using the intelligent self-priming pump, on-off of the pump can be controlled through a water level switch; and moreover, the functions of automatically turning off the pump and preventing the pump from getting stuck in the absence of water are achieved.

The invention relates to the technical field of electromagnetic emission, in particular to a micro reluctance coilgun projectile firing rate control method based on a switching sequence. A motion state curve of projectiles in a coil magnetic field is obtained through finite element analysis of electromagnetic emission, the projectile speed corresponding to each time point is obtained through the motion state curve, a control pulse is output by a single chip microcomputer to control a fully controlled switching device, so that a transmission circuit is controlled to be connected or disconnected, the purpose of controlling generation and disappearance of a coil magnetic field is achieved, motion time of the projectiles in the coil magnetic field is controlled, and the purpose of controllingthe projectile outlet speed is achieved.

The invention discloses a piston type pneumatic control valve. The piston type pneumatic control valve comprises a valve body, wherein the valve body is provided with step blind holes and is internally provided with a valve seat; the valve seat is internally provided with a valve rod; the valve rod is provided with a sealing ring groove which is internally provided with a K-shaped sealing ring to realize sealing between the valve seat and the valve rod; an air inlet cavity is formed between the upper surface of the valve rod and the inner surface of a valve cover; the stressing area of the air inlet cavity to the upper end surface of the valve rod is larger than that of an input port to the lower end surface of the valve rod. Due to the structure, the working air pressure for enabling the valve rod to move downwards is low, and due to low air pressure, and the friction force and the wearing to the valve rod are reduced, so that the service life of a moving part is greatly prolonged. The piston type pneumatic control valve is mainly used for braking systems of railway vehicles, can realize connection and disconnection of the pipeline by fine adjustment to the air inlet pressure of a control port, and has the advantages of simple structure, reliable sealing and stable working performance; According to the technical scheme disclosed by the invention, all sealing pieces are respectively made of materials with high-temperature resistance and low-temperature resistance, and the requirement on long-time and normal use of the railway vehicles under the condition of severe environment can be met.

The invention relates to the technical field of adjusting valves, and provides a transverse-mounting type pneumatic piston executing mechanism of an angular travel adjusting valve. The transverse-mounting type pneumatic piston executing mechanism comprises a box body, wherein a first air cylinder is connected with a second air cylinder through the box body, the two ends of a piston rod respectively penetrate into the first air cylinder and the second air cylinder, and are connected with a first piston body and a second piston body, a first fork part and a second fork part which are arranged opposite to each other are arranged at one end of a shift fork body, the other end of the shift fork body is connected with a rotary shaft, the piston rod is positioned between the first fork part and the second fork part, two slide block bodies are respectively embedded into the corresponding fork openings, a slide block pin penetrates through a block spin connecting hole and a slide block pin connecting hole to connect the slide block bodies and the piston rod, and a clutch manual operation mechanism comprises a worm gear, an eccentric sleeve, a worm, a worm shaft and a hand wheel. The transverse-mounting type pneumatic piston executing mechanism has the advantages that the operation can be switched to the manual operation when the automatic control of the executing mechanism fails, and the operation is switched to the automatic control after the failure is eliminated; the opening degree position of the adjusting valve can be monitored, and the accuracy is high.

The invention relates to a temperature sensing bulb temperature control device. The temperature sensing bulb temperature control device comprises an air valve and a temperature sensing bulb. The temperature sensing bulb is filled with inert gas. The make-and-break state of refrigerant inside the air valve is adjusted through change of the temperature and volume of the inert gas, so that temperature adjustment is achieved. A temperature control mechanism is arranged at the upper end of the air valve. A valve element bracket is arranged above a first vent hole. A transmission rod pushes a steelball under the effect that the transmission rod is subjected to the gas pressure inside the valve so that the make-and-break state of the first vent hole and a second vent hole can be achieved. A fixing ring is in close contact with the transmission rod through a compression spring. By means of a membrane piece, the gas pressure change inside the temperature sensing bulb is transmitted to a transmission piece, and then, the transmission rod is controlled to move up and down through the compression spring. The temperature sensing bulb temperature control device is reasonable in structure and ingenious in design; the electric power is not used; the constant temperature can be adjusted and maintained automatically; the device is safe and convenient to use; the technical problems that in existing refrigeration equipment, a temperature control device is unreasonable in structure, the constant temperature cannot be adjusted automatically, and the temperature control device is unsafe to use are solved; and for the prior art, the good market prospect and development space are achieved.

The invention provides an opto-electronic hybrid system realizing quantum coherence. The system comprises a fixed cavity mirror, a movable cavity mirror and a charge body; an optical cavity provided with cold atom cloud is formed between the fixed cavity mirror and the movable cavity mirror, and the movable cavity mirror is filled with charge; probe light is injected into the optical cavity; the charge body forms capacitive coupling with the movable cavity mirror; a current generator is electrically connected with the charge body so as to inject charge. Quantity of injected charge is regulated so as to control coulomb force between the charge body and the charge on the movable cavity mirror, then the movable cavity mirror is controlled to move relative to the fixed cavity mirror, and intensity of a cavity field generated in the optical cavity due to external action is changed, as a consequence, a quantized cavity field serving a control field is changed, then interaction between the probe light and atoms in the atom cloud is regulated coherently according to the change of the cavity field intensity, and storage / retrieval of information included in the probe light in the cold atoms or on / off of a probe light transmission path is realized. The system has the advantage of high integration of electronic control, has a cavity quality regulation function and realizes quantum memory by cavity induced transparency.

The invention belongs to the technical field of lamp bases, and solves the problems that the prior GU24 lamp base has inconvenient wire replacement, and when the wire is pulled by external force, electrode contact pieces can be easily pulled to move and influence the electric connection with the lamp head. The GU24 pushing-handle switch lamp base comprises a base shell (3), wherein a front blocking piece (1) of the base shell (3) is provided with two slotted holes (2), and the internal side of the front blocking piece (1) is respectively provided with a first electrode contact piece (4) and a second electrode contact piece (5) which are arranged beside the slotted holes (2). The front blocking piece (1) is provided with a moving contact piece (6), the first electrode contact piece (4) is provided with a fixed contact piece (7), the base shell (3) is provided with a slotted hole (8), a pushing rod (9) is arranged in the slotted hole (8), the pushing rod (9) is provided with a clamping slot (10), and the clamping slot (10) is clamped on the moving contact piece (6). The lamp base is provided with a switch, and has simple and compact structure, small size and strong switched-on currents.

The invention discloses a passive adjustable temperature control switch which comprises a box cover, a temperature control mechanism, a support assembly, a metal switch pressing piece and a box body, wherein the temperature control mechanism comprises a membrane box and a vertically arranged adjusting shaft; a supporting frame is fixedly connected to the lower portion of the temperature control mechanism; the metal switch pressing piece is installed on a supporting frame supporting plate in a sleeved mode, and one end of the metal switch pressing piece stretches out of the supporting frame; a pressing piece protruding upwards and abutting against the side face of the supporting frame is arranged in the metal switch pressing piece; the membrane box is a gas expansion type temperature sensing membrane box and comprises an upper membrane, a lower membrane, an upper shaft and a lower shaft, the disc-shaped metal upper membrane is buckled with a cavity of the lower membrane oppositely, the edge of the upper membrane and the edge of the cavity of the lower membrane are sealed and connected together, and a formed sealing inner cavity is filled with gas media; the upper shaft on the top of the upper membrane is fixedly connected with the lower end of the adjusting shaft; the lower end of the lower shaft on the lower portion of the lower membrane abuts against the upper end face of the metal switch pressing piece on the supporting frame. The passive adjustable temperature control switch is not affected by network voltage large-amplitude fluctuation, small in size, low in manufacturing cost, convenient to install and capable of accurately controlling the temperature, and a power supply is not needed to be equipped in addition.

The invention relates to an intelligent medical warming blanket which comprises a blanket body, heat transfer wires, heating wires, a high temperature wire and a controller. The blanket body is provided with a wire outlet hole; two heat transfer wires are arranged in parallel in the blanket body; the two heat transfer wires are led out of the wire outlet hole to be connected with the controller; a plurality of threading slots are uniformly distributed in the blanket body; one heating wire is inserted in each threading slot; each heating wire is provided with a connection terminal; the connection terminals are respectively connected in parallel to cathodes of the heat transfer wires and one high temperature wire in a staggered manner; a temperature sensor is fixedly arranged on the heating wires; the sensor is connected with the controller by two transmission wires. The controller in the medical warming blanket carries out analysis and distribution on temperature data acquired by the temperature sensor by a singlechip and a control circuit, so that a function of realizing intelligent heating of the medical warming blanket is expanded; and the temperature sensor is in physical contact with the heating wires, so that the temperature can be directly acquired and the data is fed back to a temperature controller.

The invention discloses a sludge dewatering device. The sludge dewatering device comprises a tank body, wherein a lifting drum is arranged at the middle position of the upper end of the tank body in apenetrating manner; an upper locating bearing matched with the lifting drum is arranged at the upper end of the tank body; a charging barrel is connected to the lower end of the lifting drum; the bottom of the charging barrel is fixedly welded with the lifting drum; a water outlet hole is formed in the side face of the charging barrel; a sludge filtering screen clings to the inner wall of the charging barrel where the water outlet hole is located; the inner wall of the upper end of the charging barrel is fixedly connected with the lifting drum by a connecting rod. The sludge dewatering devicedisclosed by the invention has the advantages of simple and reasonable structure, convenience in handling, convenience in device maintenance and high practicality; dewatering treatment of sludge is effectively realized and sludge removal is also facilitated.

The invention provides a one-way valve and an automatic intermittent pumping system and method with the one-way valve. The one-way valve comprises an upper connector, a valve cover, a middle connectorand a lower connector which are coaxially connected in a screwed mode in sequence. The upper connector, the valve cover, the middle connector and the lower connector are coaxially connected in a screwed mode to form a revolving body structure with an axial hollow channel, and oil liquid flows through the axial hollow channel of the hollow revolving body. A valve seat, a valve element and a protective sleeve are arranged in the axial hollow channel, wherein the head of the valve element can be in contact with the valve seat in a setting mode, the tail of the valve element is fixedly connectedto one end of a reset spring, the other end of the reset spring is fixedly connected with an electromagnet, and the electromagnet is arranged in the protective sleeve. The electrified electromagnet slides in the protective sleeve and drives the valve element to be set or away from the valve seat through the reset spring, so that the axial hollow channel is in a blocked state or a smooth state. Thereset spring can control the opening pressure of the one-way valve, so that the opening pressure is kept within a small range, and flow change and even back pressure backflow caused by overlarge opening pressure are avoided.

The invention provides a passive temperature control fluid path on-off switch. The on-off switch is arranged on a fluid pipeline pipe wall, and a through-flow hole is formed in the fluid pipeline pipe wall. The on-off switch comprises a cylindrical side wall and an end cover, wherein the cylindrical side wall is fixed on the fluid pipeline pipe wall, the end cover is buckled on the top end of the cylindrical side wall, a limiting space is formed among the cylindrical side wall, the end cover and the fluid pipeline pipe wall and is filled with thermal deformation filler, a heater is arranged in the thermal deformation filler, a central through hole is formed in the end cover, a cut-off hole is formed in the thermal deformation filler, and the cut-off hole in the thermal deformation filler, the central through hole in the end cover and the through-flow hole in the fluid pipeline pipe wall form a fluid path. According to the passive temperature control fluid path on-off switch provided by the invention, switching between on and off of the fluid path is realized by utilizing the opening and the closing of the cut-off hole; realization of the switching between on and off does not need outside interference, so that the switch has the passive characteristic; the reliability is high, the structure is simple, and routing inspection and daily maintenance are not needed.

The invention provides a remotely controllable switch gear, which comprises a switch control module, a wireless communication module and a switch module, wherein the wireless communication module is a GSM (global system for mobile communications) module, a CDMA (code division multiple access) module, a Bluetooth module, a ZigBee module, a WiFi (wireless fidelity) module, a UMB (ultra-mobile broadband) module or an NFC (near field communication) module; the switch control module is capable of opening, closing or switching a switch of the switch module; the remotely controllable switch gear also comprises a switch detection module, and therefore the detection information of the switch module can be obtained and a switch control action can be optimized according to the detection information. By adopting the remotely controllable switch gear, the existing sockets, plugs or conduction cables can become remotely controllable sockets, plugs or conduction cables. According to the switch gear provided by the invention, power on and power off can be realized without contact, and is realized at any indoor position and even at a long distance, and therefore people are greatly facilitated, and electricity safety is realized better.

An automatic reset switch comprises a base, a middle plate, a button, a rocker, a rotor, a spring, and a spring rod, wherein the base is fixedly connected with the middle plate; the button is connected with the middle plate in a sliding mode; the rocker is arranged on the base; the rocker is provided with a first guide block and a second guide block, and a guide groove is formed between the first guide block and the second guide block; the rotor is located between the middle plate and the button; the spring abuts in the middle of the rotor and the middle plate; the rotor is provided with a sliding block and two pressing blocks; the sliding block is arranged in a penetrating mode in the middle plate and is accommodated inside the guide groove; the two pressing blocks are arranged in a penetrating mode in the middle plate and is located at two ends of the rocker; and the spring rod is located between the base and the middle plate, one end is connected with the middle plate and the other end is connected with the rocker. According to the automatic reset switch, the button is pressed through simple mechanical matching, the rotor drives the pressing blocks to press downwardly to enable the rocker to rotate, on and off of the power supply are realized, the assembly process is simplified, and the production efficiency is improved.

The invention belongs to the field of electromagnetic control fluid, and relates to an electromagnetic valve for fluid flow control. The electromagnetic valve comprises a valve body which is provided with an inlet and an outlet. The valve body is connected with a core tube assembly which is sleeved with a plastic package assembly. The core tube assembly comprises a core tube, a movable magnetic core and a reset spring. A static magnetic core is arranged at the upper end of the core tube. The movable magnetic core is located in the core tube, and a sealing plug used for sealing the outlet of the valve body is arranged at the lower end of the core tube. The reset spring is located in a spring insertion groove in the movable magnetic core, and the upper end of the reset spring is connected with the static magnetic core in a contact mode. The two-position two-way electromagnetic valve used for controlling an engine oil line is simple in structure, and connection and disconnection of the oil line are achieved through connection and disconnection of a coil; the two-position two-way electromagnetic valve used for controlling the engine oil line is good in sealing effect through a conical seal, the two-position two-way electromagnetic valve can bear impact caused by repeated opening and closing of the electromagnetic valve, and the service life of the two-position two-way electromagnetic valve is long.

The invention discloses a two-position four-way rotary reversing valve. The two-position four-way rotary reversing valve comprises a valve body, a valve element arranged in the valve body, a valve cover for fixing the valve element in the valve body, and a pressing spring; the valve body includes a baseplate, and a valve element mounting cylinder projected from a mounting surface of the baseplate to be far from the mounting surface; four oil ports P, T, A and B are formed in the baseplate; a large end of the valve element is inserted in the valve element mounting cylinder, and a small end is exposed out of the valve element mounting cylinder; a blocking convex block is arranged on the large end surface of the valve element; the outer diameter of the middle section of the valve element is smaller than the outer diameter of the large end thereof for annularly coating the pressing spring on the middle section; a limiting convex block is outwards projected on the outer wall of the small end of the valve element; the valve cover covers the valve element mounting cylinder for axially fixing the valve element in the valve element mounting cylinder; the valve cover is provided with a through hole for penetrating through the small end of the valve element; and the inner wall of the through hole is outwards projected with an arc limiting space corresponding to the limiting convex block.

The invention relates to an upper install ball valve, whose element is vertical to the water direction or the axle of water tube, wherein the invention has high control accuracy, stable property, and low rotation torque, while its idle rotation torque is not higher than 0.5N-m (0.05kgf-m); and the invention has high property than common ball valve, whose pressure resistance is improved from 1.6MPa to 3.5MPa. The inventive ball valve element is mounted on the valve body.

The invention relates to an extractor hood. The extractor hood comprises a shell, a touch control switch and an indication panel. The touch control switch and the indication panel are oppositely arranged and are located on the two sides of the shell correspondingly. The touch control switch comprises a key circuit board, a plurality of trigger pieces arranged on the key circuit board, and a plurality of conductive execution pieces corresponding to the trigger pieces in a one-to-one manner. The key circuit board is provided with a touch induction circuit. The trigger pieces sense the control actions on the indication panel side and output corresponding manipulation signals. The touch induction circuit correspondingly receives different manipulation signals and output different control signals. The conductive execution pieces receive the different control signals and execute the corresponding control actions. The extractor hood can achieve the isolated-space touch control switch on-off state control, and the touch control sensitivity is high.

The invention relates to the technical field of radio frequency electromechanical system, and discloses an electrostatic push-pull type mono-crystal silicon beam radio frequency micro-electromechanical system switch comprising a switch movable portion and a switch immovable portion; the switch movable portion is formed by a top layer mono-crystal silicon of SOI, upper sides of two ends of the switch movable portion is respectively provided with a lower electrode and a contact; the switch immovable portion is fixedly connected with the top layer mono-crystal silicon of SOI, lower sides of two ends of the switch immovable portion and the position corresponding to the lower electrode of the switch movable portion are provided with upper electrodes, lower sides of two ends of the switch immovable portion and the position corresponding to the contact of the switch movable portion are provided with transmission wires; the upper electrodes and the lower electrodes form a push-pull type structure by respectively applying voltage to the upper electrodes and the lower electrodes of two ends in order to contact or disconnect the transmission wires and the contacts, thus realizing the switch movement. Usage of the invention can reduce the drive voltage, prolong the service life of the switch and make RF MEMS become products more likely.