856 results about "Back pressure" patented technology

The invention discloses a system and method for testing flow, displacement and hydraulic power of a main valve element. The system comprises two displacement sensors, a tested balance valve and a hydraulic testing assembly. A main valve core and a pilot valve core of the tested balance valve are coaxially and oppositely arranged; the two displacement sensors are coaxially fixed with the main valve core and the control piston respectively; the hydraulic test assembly detects the pressure of an oil return port A, a load oil port B, a feedback spring cavity pressure measuring port Pc and a pilot oil inlet X through pressure sensors; the load pressure, the pilot pressure and the oil return back pressure are controlled through a main load oil way, a pilot control oil way and an oil return back pressure oil way respectively, and meanwhile the flow of the oil return is measured through a flow meter. According to the invention, the flow, displacement and hydraulic force of the main valve core under different working conditions can be synchronously and dynamically measured.

The invention discloses a method for evaluating forced vibration stress of a blisk, which relates to the technical field of aero-engines and comprises the following steps: constructing a single-sector finite element model of the blisk and a multi-stage single-channel model of a gas compressor, and carrying out modal analysis containing prestress to obtain a Campbell graph of the blisk, a dangerous mode and a dangerous rotating speed; the method comprises the following steps: calculating steady flow fields of different back pressures at dangerous rotating speeds to obtain working points, respectively carrying out nonlinear harmonic method oscillation flow field calculation and nonlinear harmonic method static interference unsteady flow field calculation at the working points to respectively obtain aerodynamic damping and wake excitation, carrying out dot product on the wake excitation and a dangerous mode to obtain modal force, and carrying out nonlinear harmonic method oscillation flow field calculation and nonlinear harmonic method static interference unsteady flow field calculation on the modal force. And calculating forced vibration complex stress response by adopting a modal force method based on the aerodynamic damping and the modal force so as to obtain real stress response and maximum vibration stress thereof. The blisk forced vibration stress assessment method provided by the invention has important engineering significance for improving the design level and test guidance capability of the blisk.

The invention provides a compressor pressure relief structure, a compressor and an air conditioner. The compressor pressure relief structure comprises a first-stage compression assembly and a second-stage compression assembly. A first pressure relief channel is formed in the partition plate assembly, an assembly avoiding groove and a second pressure relief channel are formed in the second-stage air cylinder, at least part of structure of an opening and closing element is arranged in the assembly avoiding groove, and the opening and closing element can move in the assembly avoiding groove and the second pressure relief channel so that the second pressure relief channel can be communicated with or disconnected from the first pressure relief channel; the opening and closing element comprises a first end and a second end which are opposite to each other, the first end is opposite to the first pressure relief channel so as to bear the gas pressure of the first pressure relief channel, the second-stage air cylinder is further provided with a first back pressure channel, and the first back pressure channel can introduce exhaust gas of the compressor into the assembly avoiding groove; and the pressure acts on the second end so as to apply pressure to the second end. According to the compressor, the technical problem that in the prior art, a rivet pressure relief valve plate structure is adopted for a compressor, and flutter occurs can be solved.

The invention discloses a self-adaptive test system and method for a hydraulic power unit, and the system comprises a test bench which is provided with a fixing tool for fixing the tested hydraulic power unit; the oil tank unit is arranged in the test bed and is used for supplying oil to and pumping oil from the tested hydraulic power unit; and the counterweight test unit is arranged in the test bench, the counterweight test unit comprises a counterweight module, and the counterweight module is connected with a working oil port of a tested hydraulic power unit through a first oil path. The device is simple in structure, directly simulates the real gravity load borne by the hydraulic execution mechanism through the counterweight module, and can accurately test the lifting and descending dynamic performance and the pressure maintaining internal leakage characteristic of the power unit under the load condition. The problems that a traditional back pressure method cannot truly simulate the gravity load, and descending speed control and energy recovery performance are difficult to evaluate are effectively solved.

The embodiment of the invention relates to the technical field of steam turbine cold end optimization, in particular to an air cooling unit spray cooling cooperative control method and device, equipment and a medium. And the spraying cooling amount needed for achieving the target back pressure is calculated based on a thermodynamic characteristic model, so that a feedforward spraying water amount control scheme is formulated, the predicted working condition and the spraying scheme are comprehensively considered, the rotating speed of the air cooling fan is optimized and set through a decision optimization model, and cooperative control over the fan and a spraying system is achieved. By means of the method, advanced and accurate control over the spraying water amount and the rotating speed of the draught fan is achieved. The collaborative optimization strategy ensures that the system can operate in an economic mode under different working conditions, that is to say, on the premise of meeting the backpressure constraint, the overall economic operation level of the system is remarkably improved while safe and efficient operation of a unit is ensured by weighing the fan power consumption cost and the spraying water consumption cost.

The invention discloses a hydrogen compressor test device and a test method.The test device comprises a gas storage bottle set, two inlet buffer tanks, two testers, two outlet buffer tanks and a back pressure valve which are sequentially communicated through pipelines, and the inlet buffer tanks and the testers are connected in parallel; outlets of the back pressure valves are communicated to the two groups of inlet buffer tanks, and the two groups of back pressure valves are arranged in parallel; the pipe diameters of the inlet pipelines and the outlet pipelines corresponding to the inlets and the outlets of the two groups of testing machines are different, so that the displacement is controlled according to the pressure. The system has the characteristics of wide working condition, high pressure, large discharge capacity, automatic control and gas recovery, can monitor performance parameters such as temperature, pressure, discharge capacity and the like in a platform operation process in real time, meets the requirements of various hydrogen energy compressor type tests, predelivery tests and scientific research tests, and provides support for design, simulation and performance evaluation of a unit.

The invention relates to the technical field of thermal power generation, in particular to a closed circulation cold end optimization method, device and system, and the method comprises the following steps: obtaining the historical operation data of a unit from a power plant monitoring information system, the data comprises circulating water flow, circulating water inlet temperature, circulating water outlet temperature, condenser backpressure water pump motor current, generator power, medium and low pressure heat supply steam flow, condenser steam-water temperature and condenser water inlet and outlet pressure; s2, performing abnormal value processing on the data obtained in the step S1, namely screening out an abnormal value, and repairing and filling the abnormal value by using an interpolation method; based on the actual condition of the power plant, the unit load and the steam admission amount of the condenser are fitted through a large amount of historical data in the step S2; the total power for starting different numbers of circulating water pumps and fans and the water flow corresponding to the circulating water pumps are determined according to the historical data in the step S2; respectively establishing a condenser model and a cooling tower model; constructing a circulating cooling system model, coupling the condenser model and the cooling tower model, carrying out iterative calculation until convergence or reaching the maximum number of iterations, and obtaining the condenser outlet water temperature, the cooling tower outlet water temperature, the condenser back pressure, the vacuum degree and the power generation power; fitting a correction coefficient curve by referring to the technical specification of a power plant and combining the historical data in the step S2 with the condenser backpressure-generated power correction coefficient graph; and calculating the generated power and the net output power according to the unit load and the auxiliary machine consumption, and outputting an auxiliary machine configuration scheme corresponding to the maximum net power.

The invention relates to the technical field of non-electrical variable control or regulation systems, and discloses an exhaust gas aftertreatment flow channel back pressure dynamic regulation method, which comprises the following steps: acquiring a supply source phase reference signal and establishing cyclic mapping; a fluid channel pressure signal pulse range change rate is extracted to determine a feed-forward factor; determining a pressure signal trough interval as an action window; determining a reference amplitude based on the feedback deviation and using a feed-forward factor for compensation to determine a target adjustment instruction; the adjusting mechanism is driven to move in the action window, so that the response peak value is locked in the trough interval, the adjusting action is locked in the low-energy phase, kinetic energy intervention of fluid pulses on the adjusting mechanism is avoided, and mechanical abrasion is reduced; pulse characteristic feed-forward compensation is utilized to enable an adjusting instruction to sense the trend of a flow field, the response speed is increased while a signal is smoothed, and pressure balance under the transient working condition is maintained.

The invention relates to the technical field of automatic control, and discloses an automatic control method and system for bearing grease injection. The method comprises the steps that weight data in the grease injection process are collected, a weight change curve is obtained after filtering, and the flow pulsation amplitude is calculated; when flow pulsation is abnormal, pump cavity volume and pipeline impedance parameters are obtained, pump speed correction is calculated based on pressure feedback, the pump rotating speed is adjusted, and preliminary stable flow is obtained; the state of the servo system is monitored based on the initial stable flow, if the resonance peak value exceeds the limit, servo parameters are optimized, the pumping pressure is adjusted in combination with a temperature compensation mechanism, and a compensation pressure signal is obtained; the overshoot of the pressure signal is evaluated, if the overshoot exceeds the limit, the control parameters are adjusted, the pressure deviation is corrected, a final grease injection instruction is generated in combination with backpressure suppression, precise grease injection is executed, and the weight accumulation change is monitored to judge the completion state; and the deviation between the actual total grease injection amount and the target amount is calculated, the current parameter is recorded as the initial set value of next grease injection if the precision reaches the standard, and the control precision of the grease injection process is improved.

This invention relates to the field of compressor technology, specifically to a pump body assembly, a compressor, and an air conditioner. The pump body assembly includes a cylinder and an oil guiding structure. A partition is fitted onto one side of the cylinder, and a cylinder head is fitted onto the other side. The cylinder has a vane groove for mounting a vane. A first oil groove extending axially along the cylinder is provided on the side wall of the vane groove. An oil hole is provided on the partition, opposite to the side of the vane away from the cylinder head, and the oil hole communicates with the first oil groove. The oil guiding structure guides lubricating oil to the oil hole, allowing the lubricating oil to flow into the first oil groove. A back pressure cavity is formed between the side of the vane away from the partition and the cylinder head. The oil guiding structure also guides lubricating oil into the back pressure cavity, providing a force to the vane relative to the partition. According to the technical solution of this invention, the back pressure cavity provides back pressure to the vane, balancing the axial impact of the lubricating oil in the oil hole on the vane, resulting in a more balanced axial force on the vane and thus reducing wear on the vane's end face.

The invention relates to the technical field of injection control, and particularly discloses a pressure optimization control method and system for a multi-nozzle steam injector. Basic structure parameters and operation parameters of all nozzles of the multi-nozzle steam ejector are obtained firstly, then the critical ejection ratio is calculated according to the basic structure parameters, the steam margin coefficient is obtained according to the operation parameters and the preset critical pressure, then the turbulence intensity factor and the pressure fluctuation coefficient are obtained by combining the critical ejection ratio and the steam margin coefficient, and the fluctuation coefficient is compared with the preset threshold value; if the comparison exceeds the threshold value, the opening degree is calculated and adjusted according to the real-time flow deviation and the pressure balance degree, the opening degree of each nozzle is adjusted after the back pressure change sensitivity coefficient is corrected, the flow and the pressure are balanced, and coupling interference is reduced.

The invention discloses end cover back-to-back pressure test detection equipment and method, and relates to the technical field of detection. The equipment comprises a detection tool, a pressing mechanism, a posture adjusting mechanism and a traction mechanism, the detection tool comprises an outer supporting structure and a test winding drum. Connecting flanges are arranged at the two ends of the test winding drum. The pressing mechanisms are symmetrically arranged at the two ends of the test winding drum and can support and push the end cover to be tested; the posture adjusting mechanism is arranged corresponding to the pressing mechanism and can adjust the end cover to be tested to be parallel to the connecting flange; the traction mechanism is arranged corresponding to the pressing mechanism, can move along with the pressing mechanism and applies traction force towards the pressing mechanism to the side face of the to-be-tested end cover. The device can reduce the operation difficulty, improve the installation precision, enhance the sealing effect, and ensure the pressure detection accuracy.

The invention provides a plastic pipe service life test method and device, and the method comprises the steps: filling a low-level water tank and a circulation test pipeline communicated with the low-level water tank with a test solution, injecting the test solution into a high-level water tank communicated with the low-level water tank, and enabling the interior of the high-level water tank to have a preset test solution initial volume; wherein the high-level water tank is higher than the low-level water tank by a preset height, and a gas phase space is formed at the top of the high-level water tank; charging compressed gas into the gas-phase space to enable the gas-phase space of the high-level water tank to have preset pressure so as to apply back pressure to the test solution in the low-level water tank; under the back pressure condition, heating the test solution in the low-level water tank to a target test temperature; the backpressure condition and the target test temperature are maintained, and the service life of the plastic pipe sample in the circulation test pipeline is tested. Through the integrated structure and process design, the system is in a stable high-temperature and high-pressure test state, the energy utilization efficiency is improved, the operation cost is reduced, and the test efficiency is improved.

A hydraulic retarder pneumatic control system based on an electromagnetic valve comprises an air source and an oil pool shell, the air source is sequentially connected with a pilot valve and a first inlet of a pneumatic valve in series, and the air source is further communicated with a second inlet of the pneumatic valve; an outlet of the pneumatic valve is connected in series with at least two parallel solenoid valves, outlets of the solenoid valves are connected in series with a quick discharge valve, and a first outlet of the quick discharge valve is communicated with the oil pool shell. Through reasonable arrangement of component structures and design of a pilot valve, no back pressure resistance exists during starting, the reversing resistance is small, and the system response time is greatly prolonged; and meanwhile, the electromagnetic valve is located behind the pneumatic valve, so that the starting backpressure is small, the starting power is small, quick response of work of the retarder is integrally achieved, the work response time is shortened, the cost is reduced, the overall stability of the system is improved, and the service life is prolonged.

The invention provides an adsorption pressure return type blowout control method, which comprises the following steps: intervening when well control abnormity occurs at the beginning (such as overflow precursor), compounding a methane adsorbent and a conventional drilling fluid additive to prepare high-density composite well control fluid, and injecting the high-density composite well control fluid into a shaft by a special device at a position 100-200m below a wellhead according to preset displacement and pressure parameters. According to the method, bubbles in a shaft are adsorbed through an adsorbent, the slippage speed and the gas phase volume fraction are reduced, and the synergistic effect of static pressure constraint and active adsorption is achieved. Therefore, back pressure fluctuation can be stabilized in the early stage of gas cut, gas column expansion and pressure rising are limited, the risk of pressure leakage and secondary eruption is reduced, the purpose of preventing or restraining blowout is achieved, and the gas cut blowout prevention device is suitable for complex working conditions such as fractured stratums, deep water, high temperature and high pressure and narrow-density windows.

The utility model relates to an asphalt emptying system which comprises an underground emptying groove, an asphalt storage groove, a nitrogen pipeline, a breathing pipeline and an asphalt emptying header pipe, the nitrogen pipeline, the breathing pipeline and the asphalt emptying header pipe are arranged on the upper portion of the underground emptying groove, an extrusion pipeline is arranged on the lower portion of the underground emptying groove, and the other end of the extrusion pipeline is connected with the asphalt storage groove. The nitrogen pipeline, the breathing pipeline, the asphalt emptying header pipe and the extrusion pipeline are all provided with electromagnetic valves, all the electromagnetic valves are connected with a liquid level recording interlocking alarm instrument and a pressure recording control instrument, and a gas sealing bottom valve is arranged at the connecting position of the extrusion pipeline and the underground emptying groove. The maintenance time is shortened, the workload of operators is reduced, a large amount of investment, operation cost, operation cost and maintenance cost are saved, operation is simplified, maintenance is very convenient, nitrogen serving as back pressure is prevented from being discharged, and the safety of the system is improved.

The invention discloses a fuel injection control method, device and equipment and a medium. The method comprises the steps that the injection back pressure during fuel injection of an engine is determined according to working condition parameters of the engine; the actual injection pressure is determined according to the injection demand pressure and the injection back pressure during fuel injection of the engine; according to the method, by introducing a dynamic compensation mechanism of the injection back pressure, the effective injection pressure difference can be accurately reflected, the control precision and the system robustness under the working condition of the small oil amount are remarkably improved, and the control precision and the system robustness under the working condition of the small oil amount are improved. And in an engine platform upgrading or multi-mode operation scene, whole machine rack calibration does not need to be carried out again, the development cost is greatly reduced, and the adaptability and engineering efficiency of fuel injection control are improved.

The wire stirring friction material adding device with the back pressure supporting function comprises a material adding part and a supporting part, the material adding part comprises a static shaft shoulder and a stirring shaft which are arranged together in an inserted mode, a spiral channel is formed between a spiral rod and the static shaft shoulder, and a wire feeding hole communicated with the spiral channel is formed in the static shaft shoulder; the supporting part comprises a thrust ball bearing installed on the shaft shoulder, a bearing structure installed on the thrust ball bearing and a back pressure supporting structure installed on the bearing structure. The bearing structure is detachably mounted on a shaft washer of the thrust ball bearing; a supporting shaft of the backpressure supporting structure is installed on the hanging rod in a sliding mode, and the supporting shaft is rotationally sleeved with a supporting roller. According to the wire stirring friction material adding device, the bearing mechanism and the back pressure supporting structure can be detached from the material adding part together, so that the wire stirring friction material adding device can conduct conventional workpiece machining, after the bearing structure and the back pressure supporting structure are installed, material adding machining can be conducted on a workpiece needing back pressure supporting, and collapse of a corresponding area is avoided.

The utility model discloses a positive pressure shaft seal system for a steam turbine, which comprises the steam turbine, a heat exchanger, a low pressure section seal and a high pressure section seal, the steam turbine is a back pressure type steam turbine, the steam turbine comprises a cylinder and a rotor, the cylinder is connected with a steam inlet pipe and a steam exhaust pipe, the rotor is arranged in the cylinder, and two ends of the rotor are connected with a main shaft. Low-pressure section seals and high-pressure section seals are installed on the main shaft, the low-pressure section seals on the two sides are both connected with steam leakage connecting pipes, the steam leakage connecting pipes on the two sides are both connected with a heat exchanger, and a circulating water pipeline, a condensate water pipeline and an atmosphere exhaust pipe are further installed on the heat exchanger. The shaft end steam leakage amount of the steam turbine is effectively reduced, the working steam amount consumed by the shaft seal steam extractor for establishing negative pressure is reduced, the internal pressure of the heat exchanger is positive, a water seal does not need to be arranged, and the civil engineering cost is effectively reduced.

The invention provides a fuel cell system and a humidification control method thereof. The fuel cell system comprises an electric pile, a humidifier and an air pipeline, wherein the air pipeline comprises a dry air inlet header pipe, an air pile inlet pipeline, a dry air bypass, an air return pipeline, a backpressure pipeline and a bypass pipeline; one end of the air return pipeline is connected with an air outlet of the galvanic pile, and the other end is connected with a return air inlet of the humidifier; one end of the backpressure pipeline is connected with a backflow air outlet of the humidifier, and the other end is communicated with external atmosphere; two ends of the bypass pipeline are connected with an air return pipeline and a backpressure pipeline; a first throttle valve is arranged in the dry air inlet main pipe; a second throttle valve is arranged in the dry air bypass; a third throttle valve is arranged in the air return pipeline; and a fourth throttle valve is arranged in the bypass pipeline. In this way, when humidification is needed, the opening degree of the first throttle valve and the third throttle valve can be increased, the opening degree of the second throttle valve and the fourth throttle valve can be reduced, the water supplementing requirement of the humidifier is lowered, and the problems in the prior art are solved.

The present application relates to the technical field of power hardware processing and manufacturing, and particularly relates to a cross arm production process. The process comprises: after a fluid-incompressible pressure-maintaining rigid boundary is constructed by pressing a main hydraulic cylinder, starting a microseismic device to directionally inject high-frequency mechanical microseismic kinetic energy into the cross arm; synchronously extracting a back pressure feedback value in a sealed loop and monitoring a dynamic attenuation slope thereof in real time; when the slope is detected to be flat and to be in an attenuation stagnation of internal stress release, under a timing safety interlock protection mechanism for executing confirmation of mechanical wave calming, triggering a high-frequency electrically-controlled proportional overflow valve to execute millisecond-level transient micro-pressure relief and extremely fast pressure reconstruction, so as to provide a transient volume yielding space for metal lattice rearrangement; and finally completing final state confirmation when the absolute value of the back pressure is stabilized at a zero rebound threshold. The present application can solve or at least alleviate the secondary rebound problem caused by lattice distortion residual strain energy accumulation in the forming of thick-walled metal components, and improve the production quality of the cross arm.

A pneumatic clutch control device of a railway vehicle comprises an air supply pipeline and a two-position three-way electromagnetic valve. The air supply pipeline is communicated between a main air reservoir of the railway vehicle air compression system and an air inlet of the pneumatic clutch; two ports of the two-position three-way electromagnetic valve are communicated with the air supply pipeline, and the other port of the two-position three-way electromagnetic valve is introduced into external atmosphere; a pressure switch I is arranged on the air supply pipeline between the two-position three-way electromagnetic valve and the pneumatic clutch; the set value of the pressure switch I is greater than the minimum value of the normal working pressure of the pneumatic clutch; a non-backpressure one-way valve and a pressure stabilizing air cylinder are sequentially arranged on the air supply pipeline between the main air cylinder and the two-position three-way electromagnetic valve; the pressure stabilizing air cylinder is provided with a second pressure switch, and the set value of the second pressure switch is larger than the maximum value of normal working pressure of the pneumatic clutch. And the controller can receive signals of the first pressure switch and the second pressure switch so as to control the two-position three-way electromagnetic valve. The boosting time of the clutch air cavity is shortened, friction plate loss in the boosting process is reduced, and the pressure is more stable when the pneumatic clutch works.

The invention relates to the related technical field of mechanical equipment and tools, in particular to a locking type quick nut which is composed of a nut petal A, a nut petal B, a back pressure plate, a locking screw, a handle, a pin, a stable support, a wave-shaped reset spring and the like, can quickly move relative to the screw, can lock the screw, is free of assembly time, stable, flexible, reliable, convenient and efficient to use and high in practicability.

The present application relates to the technical field of energy utilization, and particularly to a combined heat and power generation system capable of efficiently and flexibly heating by means of dual-unit combined supply, comprising a high backpressure unit and a conventional unit, and further comprising a first-stage heating unit, a second-stage heating unit, a third-stage heating unit, and a fourth-stage heating unit. In the present application, four stages of different heating units are provided and are simultaneously communicated with a conventional backpressure unit and the high backpressure unit, and a low-pressure cylinder crossover pipe heating mode and a low-pressure cylinder zero-output heating mode are flexibly selected on the basis of the total steam consumption demand of the third-stage and fourth-stage heater in combination with the real-time electric load condition of the conventional backpressure unit, so that the heating load of the units can be adjusted more flexibly; and when an electric load is determined, the external heating loads of the conventional and high backpressure units can fluctuate between -50% and +50%, and a high thermal-electric decoupling capability is realized.

An electric compressor includes a housing, refrigerant inlet port, a refrigerant outlet port, an inverter section, a motor section, a compression device and a front cover. The housing defines an intake volume and a discharge volume. The refrigerant inlet port is coupled to the housing and is configured to introduce the refrigerant to the intake volume. The compression device is a scroll-type compression device configured to compress the refrigerant. The refrigerant outlet port is coupled to the housing and is configured to allow compressed refrigerant to exit the scroll-type electric compressor from the discharge volume. The electric compressor including a scroll backpressure system, located at least partially, within a compression device body.

A construction machine includes a relief valve that opens to limit a pressure of a pump discharge line that is a line between a main pump and a direction switching valve, a back pressure generation mechanism that is disposed on a return line that is a line connected to a tank and generates a back pressure in the return line, and an air bleed line that connects the relief valve and a portion downstream from the back pressure generation mechanism in the return line.

The application provides a device and method for simulating low-efficiency water drive thick oil viscosity reduction composite drive enhanced oil recovery, which comprises an injection system, a three-dimensional large-size sand filling model, a multi-well back pressure measurement and control system and a multi-well flow metering system. The injection system is connected to the three-dimensional large-size sand filling model, and fluid is injected into the three-dimensional large-size sand filling model which can simulate well pattern mode. The multi-well back pressure measurement and control system is connected to the three-dimensional large-size sand filling model, and the formation pressure is set. The multi-well flow metering system is connected to the three-dimensional large-size sand filling model, and the output fluid is metered. The device and method for simulating low-efficiency water drive thick oil viscosity reduction composite drive enhanced oil recovery can meet the enhanced oil recovery experiments of water drive, polymer drive, viscosity reduction drive, viscosity reduction composite drive and the like of three-dimensional large-scale heterogeneous reservoir models under different well pattern modes, and has important significance for the enhanced oil recovery of low-efficiency water drive thick oil reservoirs.

This invention provides an electric valve that ensures the valve core is seated when the valve is closed without using a spring with a large force. The electric valve includes: a valve body having a valve chamber, a valve port, and a valve seat; a valve shaft inserted into the valve chamber; a valve core connected to the valve shaft; and a valve shaft drive unit that drives the valve shaft to bring the valve core closer to or further away from the valve seat. The valve body has an inner wall forming a back pressure chamber on the side opposite to the valve port and separated from the valve core. A sealing member is disposed between the valve shaft and the inner wall. The electric valve includes a force generating unit that generates an axial force transmitted from the sealing member to the valve core when the valve core is seated on the valve seat.

The utility model provides a kind of compressor and refrigeration equipment, compressor includes: shell, shell includes air inlet cavity and exhaust cavity;Compression mechanism, be located in air inlet cavity, compression mechanism includes dynamic disc and static disc assembly, dynamic disc and static disc assembly form compression cavity, static disc assembly includes exhaust passage, compression cavity can be communicated with exhaust cavity by exhaust passage;First back pressure cavity, be located in the side of static disc assembly away from dynamic disc, and can be communicated with compression cavity;Support frame, be located in air inlet cavity, and located in the side of dynamic disc away from static disc assembly, for supporting dynamic disc;Second back pressure cavity, be located between dynamic disc and support frame, at least one of first back pressure cavity, exhaust passage and exhaust cavity is communicated with second back pressure cavity, to reduce the friction between dynamic disc and support frame, significantly reduce friction power consumption, improve the sealing between static disc assembly and dynamic disc spiral tooth, it is favorable to improve the energy efficiency of compressor.

The variable-capacity compressor comprises a first air cylinder, a second air cylinder and a partition plate, the second air cylinder is provided with a second sliding piece and a variable-capacity cavity, the partition plate is provided with a pressure relief opening, the pressure relief opening is communicated with the variable-capacity cavity, and the first air cylinder is provided with a valve groove and a pressure relief channel opposite to the pressure relief opening. The pressure relief channel is located between the valve groove and the pressure relief opening, at least part of the structure of the pressure relief valve is arranged in the valve groove, and the pressure relief valve can move in the valve groove and the pressure relief channel so that the pressure relief channel can be communicated with or disconnected from the pressure relief opening. The pressure relief valve comprises a first end and a second end which are opposite to each other, the first end is opposite to the pressure relief opening so as to bear the pressure of the pressure relief opening, the first air cylinder is further provided with a back pressure channel, and the back pressure channel can introduce fluid in the shell cavity so as to apply pressure to the second end. According to the invention, the problems of noise, jittering and the like generated when the variable-capacity compressor is started after long-time low-temperature standing can be solved.