31results about How to "Adjust working pressure" patented technology

The invention discloses a two-way pressure relief valve. A branch pipeline with a branch valve is arranged on a main pipeline, wherein the branch pipeline is connected in parallel with a main valve, and a pressure reducing bin with a plurality of pressure reducing valve blocks are connected in series in the branch pipeline. By arranging the pressure relief branch pipeline connected in parallel with the main pipeline, auxiliary two-way pressure relief and flat pressing functions are realized after the main pipeline is closed. Through the pressure reducing bin connected in series in the branch pipeline, the buffer pressure reducing effect is achieved. Through the flexible pressure reducing valve blocks, certain deformation is generated when the two-way pressure relief valve is impacted by pressure to support liquid discharging. By adjusting the number of pressure reducing valve blocks, the working pressure of the pressure reducing bin can be adjusted. Through the different spacing between the pressure reducing valve blocks, the pressure can be reduced differentially in a progressive mode. Compared with an existing pressure relief valve, the two-way pressure relief valve has the simple structure, small size, small use limit and high reliability, can effectively reduce and smooth the bidirectional surge pressure in a transportation pipeline, and has high practicability and wide applicability.

The invention discloses a self-cleaning chemical raw material extraction device capable of effectively adjusting internal pressure intensity, which comprises a device shell, an electric heating pipe, a main stirring rod, a rubber piston and a cleaning plate; a limiting frame is welded and fixed on the device shell, a reciprocating screw rod is in threaded connection with a connecting plate, and the connecting plate is in screw connection with a push rod; a rubber piston is connected to the bottom end of the push rod through a screw, the rubber piston is slidably connected into the ventilation barrel, a fixing shaft is rotationally connected into the device shell, a lower rotating plate is welded and fixed to the fixing shaft, and a cam is connected to the fixing shaft through a screw. According to the self-cleaning type chemical raw material extraction device capable of effectively adjusting the internal pressure intensity, the cleaning plate is arranged, and a cam can drive the cleaning plate on a sliding plate to reciprocate up and down in the device shell under the gravity action of the sliding plate, so that self-cleaning work can be effectively carried out in time, and the working efficiency and the use diversity of the device are effectively improved.

The invention relates to an extrusion-type textile flexibility dewatering method and a device. The device comprises a dewatering container, a movable pressing plate, a dynamical system and an electric control system. According to the characteristics of different textiles, a dewatering pressure curve is written, and then the dewatering pressure curve is preset in the electric control system; after the dynamical system receives a dewatering pressure curve signal sent by the electric control system, the dewatering pressure curve preset by the electric control system is used for controlling the movable pressing plate to move along the dewatering container so as to cause the movable pressing plate to extrude textile and discharge water extruded from the textile via the dewatering hole of the dewatering container; thus, flexibility dewatering can be effectively carried out on textile, and the textile can be protected from being easily damaged, which is favourable for developing industrial scour industry.

The invention relates to a mechanical pressure regulation type electric pressure cooker. The electric pressure cooker comprises a pot main body, an electric control system and a pot cover arranged on the pot main body, wherein the pot main body comprises a shell, a heater arranged in the shell and an inner pot arranged on the heater; the mechanical pressure regulation type electric pressure cooker is characterized by further comprising a signal switch which is electrically connected with the electric control system, and the signal switch is movably arranged on the shell through a regulating mechanism; and a lever which can amplify the displacement of the heater is arranged in a space below the heater, a fixed pivot point is arranged at the middle part of the lever, a lever arm at the head end of the lever is used for sensing the displacement of the heater, and the lever arm at the tail end of the lever is used for triggering the signal switch. By the adoption of the technical scheme, the mechanical pressure regulation type electric pressure cooker has the advantages and characteristics that the structure is simple and working pressure in the pot can be adjusted freely and conveniently, therefore the mechanical pressure regulation type electric pressure cooker can be applied to electric pressure cooker products.

The invention discloses an electric automobile battery heat preservation structure. A battery comprises an outer shell, a battery module arranged in the outer shell, a liquid cooling water pipe set arranged on the lower side of the battery module and connected with a cooling source through a water inlet pipe connector and a water outlet pipe connector, and a supporting beam used for supporting thebattery module is arranged on the edge of the bottom of the outer shell. The liquid cooling water pipe set comprises liquid cooling water pipes arranged side by side and reinforcing components used for improving the bending strength of the liquid cooling water pipes, the upper side of the liquid cooling water pipe set is tightly attached to the lower side face of the battery module, a heat insulation gap is formed between the lower side of the liquid cooling water pipe set and the outer shell, and each reinforcing component comprises a supporting protrusion attached to the supporting beam. The heat insulation effect between the liquid cooling water pipe and the outer shell can be effectively improved, heat conduction between the liquid cooling water pipe and the outer shell is avoided, tight attachment between the liquid cooling water pipe and the battery module can be ensured, and therefore the heat preservation effect on the battery is improved.

The invention discloses a load system of a hydrostatic transmission device detecting platform. The load system is structurally characterized in that a circuit A and a circuit B are connected in parallel to form a loading pump feed circuit, each of the circuit A and the circuit B is formed by series connection of two one-way valves, an oil tank, a one-way hydraulic pump and the loading pump feed circuit are serially connected to form a closed circuit, and two ends of a loading pump are communicated with middle positions of the circuit A and the circuit B respectively. In order to protect the whole circuit, a pilot-operated relief valve is connected in parallel in front of the loading pump feed circuit; in order to regulate oil pressure of the whole circuit and working pressure of the loading pump, an electro-hydraulic pilot-operated proportional relief valve is serially connected behind the loading pump feed circuit. The load system has the advantages that the loading pump can rotate forwards and backwards directly without stopping the one-way hydraulic pump, and a solenoid valve is sensitive in response and less in consumption.

The invention discloses a two-way pressure relief valve. A branch pipeline with a branch valve is arranged on a main pipeline, wherein the branch pipeline is connected in parallel with a main valve, and a pressure reducing bin with a plurality of pressure reducing valve blocks are connected in series in the branch pipeline. By arranging the pressure relief branch pipeline connected in parallel with the main pipeline, auxiliary two-way pressure relief and flat pressing functions are realized after the main pipeline is closed. Through the pressure reducing bin connected in series in the branch pipeline, the buffer pressure reducing effect is achieved. Through the flexible pressure reducing valve blocks, certain deformation is generated when the two-way pressure relief valve is impacted by pressure to support liquid discharging. By adjusting the number of pressure reducing valve blocks, the working pressure of the pressure reducing bin can be adjusted. Through the different spacing between the pressure reducing valve blocks, the pressure can be reduced differentially in a progressive mode. Compared with an existing pressure relief valve, the two-way pressure relief valve has the simple structure, small size, small use limit and high reliability, can effectively reduce and smooth the bidirectional surge pressure in a transportation pipeline, and has high practicability and wide applicability.

A safe valve function can be obtained by pressing an elastic body into a hole of a container containing a hydrogen storing alloy or the like. A relief valve comprises an elastic body (4) joined to a hole (3) of a container (1) and a retaining plate (6) for pressing the elastic body and has a structure in which when the pressure of hydrogen or the like in the container (1) rises, gas or the like is released to the outside from between an outer surface (3a) of the hole (3) and the elastic body (4) via an escape hole (5) for the gas or the like of the retaining plate (6).

The invention relates to a full-automatic double-workbench plate wiping machine. The full-automatic double-workbench plate wiping machine comprises a machine table, a motion controller, a truss, a first workbench, a second workbench and a plate wiping device. The motion controller is arranged in the machine table; the truss is transversely and fixedly arranged at the upper end of the machine table, and the plate wiping device is arranged on the truss and can move along the truss; the first workbench and the second workbench are longitudinally arranged at the upper end of the machine table side by side and can longitudinally move to the position below the truss; the first workbench, the second workbench and the plate wiping device are all controlled by the programmable motion controller; and the plate wiping device provides downward adjustable working pressure through a needle type air cylinder. Compared with the prior art, the double workbenches of the full-automatic double-workbench plate wiping machine can conduct plate wiping, and COB plate wiping work can be rapidly and stably completed with high quality.

The invention provides a device and method for detecting the seed metering performance of an air suction seed metering device, and relates to the field of seed metering device detection. The device comprises a driving mechanism for driving a to-be-detected seed metering device to operate, a first bracket for mounting the seed metering device, and a second bracket for mounting a seed guide pipe; a power output shaft of the driving mechanism is connected with a connector used for being in butt joint with a seed-metering shaft of a seed-metering device, a negative pressure source of the driving mechanism is connected with an air pipe used for being in butt joint with the seed-metering device, a first sensor and a second sensor are arranged on the second support at intervals, the first sensor is used for obtaining the seed-metering interval and number of an outlet of the seed-metering device, and the second sensor is used for acquiring the seeding interval and quantity after being guided by the seed guide pipe. The seed-metering device and the seed guide pipe are jointly monitored, the seed falling distribution condition of the outlet of the seed-metering device and the seed falling distribution condition of the outlet of the seed guide pipe are respectively obtained through the sensors, operation of collecting data in field test sowing is avoided, denoising is performed on performance detection of the seed-metering device according to the seed falling condition of the outlet of the seed guide pipe, and the detection precision is improved.

The invention belongs to the technical field of a regulating valve, in particular to a supermicro-pressure self-operated pressure regulating valve. The supermicro-pressure self-operated pressure regulating valve comprises a valve body, a valve rod, an executing mechanism, a pressure guide pipe and a spring I, wherein the valve rod penetrates through a plate I above the valve body and is connectedwith the executing mechanism; an outer ring of the executing mechanism communicates with the valve body through the pressure guide pipe, and the executing mechanism is connected with the plate I through a rod I; the valve rod penetrates through a thin film in the executing mechanism and extends out from the upper end face of the executing mechanism, and the upper end of the valve rod penetrates through a supporting plate and is fixedly connected with a plate II; the supporting plate is fixedly connected on the plate I through a rod II, the plate II is arranged in an inner ring of the supporting plate, and the spring I is arranged above the plate II; a press plate is arranged at the upper end of the spring I, and a plate III is arranged at the upper end of the press plate and is connected on the rod II through a bolt; and a regulating bolt is arranged at the central position of the plate III. The spring I is arranged above the executing mechanism, so that the working pressure of the self-operated pressure regulating valve is conveniently regulated.

The invention provides a cavitation device for preparing a palm oil-based submicron emulsion. The cavitation device comprises a stator, a rotor, ultrasonic transducers and a rotating shaft, wherein the stator is provided with a feeding port, a discharging port and an oxidizing agent conveying pipe, the rotating shaft is installed in the stator, the rotor is arranged in the stator, the rotor is fixedly connected with the rotating shaft, blades are distributed on the rotor, and cavitation holes are distributed in the blades. According to the invention, palm oil is used as a dispersion phase and deionized water is used as a continuous phase to prepare an oil-in-water submicron emulsion; a crude emulsion enters the stator, liquid flow in a stator cavitation cavity is coupled with rotor vibration to achieve a strong cavitation effect; through combination of an ultrasonic probe, hydraulic cavitation and ultrasonic cavitation, cavitation efficiency is improved, energy input is much lower; and thus, the device has great potential in the aspect of emulsion preparation.

The invention discloses a movable cleaning device for a precise mechanical part and with a good using effect. The movable cleaning device comprises a shell, a liquid storage tank and a cleaning tank. Stand columns are symmetrically arranged on the top of the shell left and right. Rolling wheels with foot brakes are arranged at the bottoms of the stand columns. The liquid storage tank, an oil pump, a filter, an air compressor, a storage battery and a push rod are sequentially arranged on the top of the shell from right to left. The movable cleaning device is light in structure, convenient to move and good in cleaning effect. An air gun can be used for conducting pretreatment on the precise mechanical part, purging treatment is conducted on the precise mechanical part, the treated precise mechanical part is further cleaned through an oil gun, and the cleaning effect is accordingly improved. By means of the oil gun, the cleaning fluid ejected out of the oil gun has certain injection pressure, and the precise mechanical part is effectively cleaned.

The invention discloses a novel small-flue induced draught system. The novel small-flue induced draught system comprises a hearth flue, a jet flow induced draught device, an air heating control unit connected with the control end of the jet flow induced draught device, and a closed loop hearth pressure control unit connected between a hearth and the control end of the jet flow induced draught device, wherein the hearth flue and the jet flow induced draught device are connected in sequence. The air heating control unit heats external compressed air and outputs the air to the jet flow induced draught device, and the closed loop hearth pressure control unit adjusts working pressure of the jet flow induced draught device according to the hearth pressure in real time. The novel small-flue induced draught system uses the compressed air of the air heating control unit as a power and uses the jet flow induced draught device to perform induced draught to a small flue, and the problem that the system is free of high temperature resistance, blades are abraded and dust sticks on the blades by means of an induced draught motor is solved. In addition, the closed loop hearth pressure control unit can adjust the working pressure of the jet flow induced draught device in real time.

The invention discloses an automatic condensation water return system which is characterized in that a condensation water recovery tank is connected with a boiler through a deaerator; the deaerator comprises a deaeration head and a water storage tank; the deaeration head is connected with the condensation water recovery tank through a steam pipeline; the bottom of the water storage tank is provided with a communicating pipeline; the bottom of the condensation water recovery tank communicates with the bottom of the deaerator through the communicating pipeline; an electric valve is arranged in the middle of the communicating pipeline; the top of the condensation water recovery tank is provided with an automatic pressure regulating device; the automatic pressure regulating device is used for regulating the steam pressure of the condensation water recovery tank through a pressure regulating valve; the side end of the condensation water recovery tank is provided with a liquid level meter. By using the automatic condensation water return system, the self working pressure of the condensation water recovery tank can be regulated, and the pressure difference between the condensation water recovery tank and the deaerator is made artificially, so that the automatic control of liquid levels of the condensation water recovery tank and the deaerator can be realized; and the deaerator head is used for carrying out thermal deaeration on reverse-osmosis water entering the deaeration head by virtue of flash vaporization steam generated by returned condensation water, and the communicating pipeline is used for returning condensation water to the deaerator, so that the equipment fault is reduced, water and electricity are saved, and equipment operation safety is greatly improved.

The invention relates to an extrusion-type textile flexibility dewatering method and a device. The device comprises a dewatering container, a movable pressing plate, a dynamical system and an electric control system. According to the characteristics of different textiles, a dewatering pressure curve is written, and then the dewatering pressure curve is preset in the electric control system; afterthe dynamical system receives a dewatering pressure curve signal sent by the electric control system, the dewatering pressure curve preset by the electric control system is used for controlling the movable pressing plate to move along the dewatering container so as to cause the movable pressing plate to extrude textile and discharge water extruded from the textile via the dewatering hole of the dewatering container; thus, flexibility dewatering can be effectively carried out on textile, and the textile can be protected from being easily damaged, which is favourable for developing industrial scour industry.

A safe valve function can be obtained by pressing an elastic body into a hole of a container containing a hydrogen storing alloy or the like. A relief valve comprises an elastic body (4) joined to a hole (3) of a container (1) and a retaining plate (6) for pressing the elastic body and has a structure in which when the pressure of hydrogen or the like in the container (1) rises, gas or the like is released to the outside from between an outer surface (3a) of the hole (3) and the elastic body (4) via an escape hole (5) for the gas or the like of the retaining plate (6).

The invention discloses printing equipment capable of conveniently adjusting printing pressure. The printing equipment comprises a horizontal stable bottom frame, a horizontal top plate is fixedly connected to the top of the horizontal stable bottom frame through a high-altitude plate, basic guide wheels are fixedly connected to the two sides of the bottom of the horizontal top plate, a printing paper roller adjusting device is fixedly connected to the right side of the inner wall of the horizontal stable bottom frame, and the bottom of the inner wall of the horizontal stable bottom frame is fixedly connected with an ink roller pressure adjusting device. The invention relates to the technical field of printing equipment. According to the printing equipment capable of conveniently adjustingthe printing pressure and the adjusting mode, the printing paper roller adjusting device is arranged, the height of a rolling wheel frame can be adjusted by starting an adjusting motor and adjustingthe relative positions of threaded blocks, then the tensioning degree of a paper tape is adjusted, operation is very easy, the adjusting stroke is relatively long, pressure adjustment is relatively accurate, and the motor is used for driving, workers can operate the equipment rapidly and smoothly.

The invention discloses an automatic condensation water return system which is characterized in that a condensation water recovery tank is connected with a boiler through a deaerator; the deaerator comprises a deaeration head and a water storage tank; the deaeration head is connected with the condensation water recovery tank through a steam pipeline; the bottom of the water storage tank is provided with a communicating pipeline; the bottom of the condensation water recovery tank communicates with the bottom of the deaerator through the communicating pipeline; an electric valve is arranged in the middle of the communicating pipeline; the top of the condensation water recovery tank is provided with an automatic pressure regulating device; the automatic pressure regulating device is used for regulating the steam pressure of the condensation water recovery tank through a pressure regulating valve; the side end of the condensation water recovery tank is provided with a liquid level meter. By using the automatic condensation water return system, the self working pressure of the condensation water recovery tank can be regulated, and the pressure difference between the condensation water recovery tank and the deaerator is made artificially, so that the automatic control of liquid levels of the condensation water recovery tank and the deaerator can be realized; and the deaerator head is used for carrying out thermal deaeration on reverse-osmosis water entering the deaeration head by virtue of flash vaporization steam generated by returned condensation water, and the communicating pipeline is used for returning condensation water to the deaerator, so that the equipment fault is reduced, water and electricity are saved, and equipment operation safety is greatly improved.

The invention discloses a cinnamon press-packing machine and relates to the technical field of mechanical equipment manufacturing. The cinnamon press-packing machine comprises a machine frame, a pressing basket mounted on the machine frame, and a pressing head positioned above the pressing basket; and the pressing head is connected with a piston rod in a hydraulic driving cylinder fixedly mounted on the machine frame, and the hydraulic driving cylinder is connected with a hydraulic station through an oil pipe. The machine frame is mounted on a wagon balance, and a pressure sensor connected with a weight monitor is mounted on the wagon balance. The cinnamon press-packing machine can solve the problems that the cinnamon press-packing machine is high in maintenance cost and low in production efficiency.

The invention relates to a dual-working-condition gas generating agent powder column. The gas generating agent is installed in a heat-insulating sleeve. The center of the gas generating agent is provided with a high-burning-velocity drug strip, and the surface of the gas generating agent is provided with an inner ring. The combustion-supporting groove and the outer ring combustion-supporting groove, a liner is provided at the side where the side of the gas generating agent is in contact with the heat insulating sleeve. The gas generating agent grain under dual working conditions starts to burn simultaneously from the surface of the gas generating agent, the surface of the combustion-supporting groove and the surface of the high-burning rate grain, and the burning surface shows a slow decreasing trend, and this trend lasts for a long time. The invention is used in a missile servo power device, and has the advantages of low combustion temperature, long duration of slowing down tendency of the combustion surface, multi-stage charge and multi-working-condition pressure through a single combustion rate charge, and the like.

The invention discloses a large-space efficient fire-extinguishing device. The large-space efficient fire-extinguishing device comprises a water storage tank, a high pressure water pump, a high pressure water delivery pipe and a water spray pipe which are sequentially connected in series, and further comprises a water mist spray nozzle which is connected with the end part of the water spray pipe, wherein the water mist spray nozzle comprises a base, and a nozzle body provided with a spray nozzle hole and arranged on the base; a hollow cylindrical cavity is arranged inside the nozzle body; a conical surface is arranged at the top of the cavity; the spray nozzle hole is formed in the vertex of the conical surface; an atomizing core comprising a core seat and a core body is arranged in the cavity; the core seat is in a racetrack shape and is connected with the cavity through threads; the core body is arranged on the core seat and is cylindrical; a blind hole is formed in the top of the core body; a first conical surface matched with the side wall of the conical surface of the cavity and at least two diversion grooves formed in a staggered way along the periphery of the blind hole are formed in the top surface of the core body on the periphery of the blind hole; one end of each diversion groove is communicated with the blind hole; the other end of each diversion groove is communicated with the cavity. The large-space efficient fire-extinguishing device is better in suffusion effect, small in water consumption, good in atomization effect and high in fire extinguishing efficiency.

The invention provides a hydraulic control system for a lifting oil cylinder of an under-pressure operation machine. The hydraulic control system comprises a main reversing valve, a descending brake valve, an ascending brake differential valve, the lifting oil cylinder, a pilot handle, a remote pressure regulating valve, a differential selection valve and a pressure reducing valve. A hydraulic oiltank is connected with a hydraulic pump, the hydraulic pump is connected with the main reversing valve and the pressure reducing valve, the pressure reducing valve is connected with the pilot handleand the differential selection valve, the pilot handle is connected with the main reversing valve, the main reversing valve is connected with the descending brake valve and the ascending brake differential valve, the descending brake valve and the ascending brake differential valve are both connected with the lifting oil cylinder, the main reversing valve and the ascending brake differential valveare both connected with the hydraulic oil tank, the differential selection valve is connected with the ascending brake differential valve, and the remote pressure regulating valve is connected with the main reversing valve. The hydraulic control system for the lifting oil cylinder of the under-pressure operation machine is low in manufacturing cost and short in cargo period, has multiple functions of reversing, braking, differential motion, pressure regulation and the like, is low in maintenance and repair cost, and can be suitable for various complex well conditions.

The invention provides a fully-hydraulic reverse braking clutch system, and belongs to the technical field of hydraulic pressure. The fully-hydraulic reverse braking clutch system solves the problem that the power cut-off time is difficult to control in the brake process of an existing braking system. The fully-hydraulic reverse braking clutch system comprises an oil pump, a braking valve, a brakeand a speed change gear; the braking valve communicates with the oil pump through a first oil inlet way, the braking valve communicates with the brake through a first working oil way, the braking valve controls the brake to conduct reverse braking, and a hydraulic-control reversing valve is arranged between the first oil inlet way and the brake; and a second oil inlet of the hydraulic-control reversing valve communicates with the first oil inlet way through a second oil inlet way, a second working oil opening communicates with a power cut-off control oil opening of the speed change gear through a second working oil way, the control oil opening communicates with the first working oil way, and when the pressure of the first working oil way is descended to the set value of the hydraulic-control reversing valve, the hydraulic-control reversing valve reverses to enable the second oil inlet way to communicate with the second working oil way. According to the fully-hydraulic reverse brakingclutch system, power can be cut off under the appropriate time in the brake process, and the driving comfort and safety of a vehicle are improved.

The invention relates to a fully automatic dual-workbench board wiping machine, which includes a machine platform, a motion controller, a truss, a first workbench, a second workbench and a board wiping device. The motion controller is placed inside the machine platform. , the truss is transversely fixed on the upper end of the machine platform, the wiping device is placed on the truss, the wiping device can move along the truss, the first workbench and the second workbench The first workbench and the second workbench can be longitudinally moved to the bottom of the truss; the first workbench, the second workbench and the wiping device are all composed of Controlled by a programmable motion controller, the wiper device provides downward adjustable working pressure through a needle cylinder. Compared with the existing technology, the present invention can perform board wiping operations on two workbenches and complete the COB board wiping work quickly, stably and with high quality.

The invention discloses a load system of a hydrostatic transmission device detecting platform. The load system is structurally characterized in that a circuit A and a circuit B are connected in parallel to form a loading pump feed circuit, each of the circuit A and the circuit B is formed by series connection of two one-way valves, an oil tank, a one-way hydraulic pump and the loading pump feed circuit are serially connected to form a closed circuit, and two ends of a loading pump are communicated with middle positions of the circuit A and the circuit B respectively. In order to protect the whole circuit, a pilot-operated relief valve is connected in parallel in front of the loading pump feed circuit; in order to regulate oil pressure of the whole circuit and working pressure of the loading pump, an electro-hydraulic pilot-operated proportional relief valve is serially connected behind the loading pump feed circuit. The load system has the advantages that the loading pump can rotate forwards and backwards directly without stopping the one-way hydraulic pump, and a solenoid valve is sensitive in response and less in consumption.

The invention provides a fully-hydraulic reverse braking clutch system, and belongs to the technical field of hydraulic pressure. The fully-hydraulic reverse braking clutch system solves the problem that the power cut-off time is difficult to control in the brake process of an existing braking system. The fully-hydraulic reverse braking clutch system comprises an oil pump, a braking valve, a brakeand a speed change gear; the braking valve communicates with the oil pump through a first oil inlet way, the braking valve communicates with the brake through a first working oil way, the braking valve controls the brake to conduct reverse braking, and a hydraulic-control reversing valve is arranged between the first oil inlet way and the brake; and a second oil inlet of the hydraulic-control reversing valve communicates with the first oil inlet way through a second oil inlet way, a second working oil opening communicates with a power cut-off control oil opening of the speed change gear through a second working oil way, the control oil opening communicates with the first working oil way, and when the pressure of the first working oil way is descended to the set value of the hydraulic-control reversing valve, the hydraulic-control reversing valve reverses to enable the second oil inlet way to communicate with the second working oil way. According to the fully-hydraulic reverse brakingclutch system, power can be cut off under the appropriate time in the brake process, and the driving comfort and safety of a vehicle are improved.

The invention relates to a double-working-condition gas generator propellant grain. A gas generator propellant is contained in a wrapping sleeve. The middle of the surface of the gas generator propellant is provided with a sharp combustion supporting groove. An inner ring combustion supporting groove and an outer ring combustion supporting groove are sequentially arranged outside the sharp combustion supporting groove. A lining layer is arranged at the contact portion between the side face of the gas generator propellant and the wrapping sleeve. The double-working-condition gas generator propellant grain starts combustion on the surface of the gas generator propellant and the surface of the combustion supporting groove at the same time, the combustion surface is large in the early stage, the combustion surface tends to be reduced after 12 seconds, and the combustion surface tends to be stable after 16 seconds. The double-working-condition gas generator propellant grain is used for a guided missile servo power device and has the advantages of being low in combustion temperature, changeable in combustion surface, capable of achieving double-working-condition pressures of two-graded charge through single-combustion-rate charge and the like.

The invention discloses a novel small-flue induced draught system. The novel small-flue induced draught system comprises a hearth flue, a jet flow induced draught device, an air heating control unit connected with the control end of the jet flow induced draught device, and a closed loop hearth pressure control unit connected between a hearth and the control end of the jet flow induced draught device, wherein the hearth flue and the jet flow induced draught device are connected in sequence. The air heating control unit heats external compressed air and outputs the air to the jet flow induced draught device, and the closed loop hearth pressure control unit adjusts working pressure of the jet flow induced draught device according to the hearth pressure in real time. The novel small-flue induced draught system uses the compressed air of the air heating control unit as a power and uses the jet flow induced draught device to perform induced draught to a small flue, and the problem that the system is free of high temperature resistance, blades are abraded and dust sticks on the blades by means of an induced draught motor is solved. In addition, the closed loop hearth pressure control unit can adjust the working pressure of the jet flow induced draught device in real time.