1263 results about "Relief valve" patented technology

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 an air source heat pump unattended control method and system, and relates to the field of equipment control, and the method comprises the steps: predicting a load demand according to an environment parameter and a building load parameter, and calculating a target water supply temperature based on the load demand; sorting the heat pump units according to the equipment operation duration parameters, distributing a temperature deviation value for each heat pump unit, and calculating the target water supply temperature and the temperature deviation value corresponding to the heat pump unit to obtain the personalized set temperature of each heat pump unit; a starting instruction sequence is generated according to a preset starting condition and the personalized set temperature, and after the water return pressure parameter reaches a preset parameter threshold value after the circulating water pump is started, all the heat pump units are sequentially started according to the personalized set temperature sequence; and a make-up pump and a pressure release valve are controlled according to the return water pressure parameter and the liquid level parameter, and the temperature deviation value of each heat pump unit is adjusted according to the change of the environment parameter and the building load parameter. By implementing the method, the balance of equipment loads in the multi-unit system can be improved.

The present application relates to pipeline system damping and noise reduction technical field, provide a kind of active noise cancellation pressure relief valve, comprising: valve body, with the liquid inlet cavity and pressure relief cavity being communicated are formed;Bypass pipe, with liquid inlet cavity is communicated;Piezoelectric actuator and pressure relief component, pressure relief component includes adjusting piece, pressure relief elastic piece and pressure relief valve core, pressure relief valve core and pressure relief elastic piece are set in pressure relief cavity, adjusting piece is movably arranged on valve body, piezoelectric actuator is arranged on adjusting piece, pressure relief elastic piece is pressed between piezoelectric actuator and pressure relief valve core;Piezoelectric actuator is configured to drive pressure relief elastic piece, to eliminate the transient noise caused by pulsating pressure when pressure relief valve core moves.The active noise cancellation pressure relief valve provided by the present application introduces active noise cancellation technology into the active noise cancellation pressure relief valve pulsating noise control by arranging piezoelectric actuator, can be adjusted by pressure relief elastic piece The force exerted on the pressure relief valve core can eliminate the transient noise caused by pulsating pressure when the pressure relief valve core moves.

The utility model discloses a powder dredging valve which comprises a valve body connected with a stock bin shell through a connecting piece, the left side of the valve body is communicated with an energy storage device, and the lower portion of the valve body is communicated with a pressure release valve. A valve cover connected with the valve port is arranged in the valve body in a sliding mode, and a thin film which drives the valve cover to move downwards and controls the valve port to be opened after pressure relief of the pressure relief valve is installed in the valve body. A gas source connector is arranged on a valve body passage communicated with the energy storage device, and a gas source conveying pipeline for conveying gas into the energy storage device is mounted at the gas source connector; an exhaust port is formed in a valve body passage opposite to the air source interface, the exhaust port is communicated with an air cylinder through a control air pipe, and the air cylinder is connected with a pressure release valve and controls the pressure release valve to be opened; a nozzle matched with the energy storage device to blow away blocked materials is formed in the connecting piece extending into the material bin shell; according to the utility model, the energy storage device communicated with the valve body is matched with the pressure release valve, so that air is introduced into the stock bin at a certain frequency, blocked materials are dredged, and the blanking efficiency is improved.

The utility model discloses a power battery pack anti-collision box body device with thermal runaway protection. The power battery pack anti-collision box body device comprises a box body for placing a power battery module (8), a front-back buffer structure (1), a passive anti-collision plate, a thermal runaway control device (3), a displacement damping plate (4), a partition plate (5), a cover plate (9), a built-in liquid cooling plate (6) and a phase change material plate (7). According to the device, the design of a front-back buffer structure, a passive anti-collision plate and a displacement damping plate is adopted, so that side edge protection and bottom edge protection measures are provided for the power battery module; according to the utility model, the design of the thermal runaway control device is adopted, so that thermal runaway control is provided for the power battery module; when the vehicle is in use, a refrigerant and a deoxidant in the execution module are triggered to operate together, batteries in the subareas are rapidly refrigerated and rapidly extinguished, a one-way pressure release valve is opened to discharge high-temperature and high-pressure gas, and a vehicle alarm device is started to remind people in the vehicle and around the vehicle to get away immediately, so that the life and property safety of people is protected, and an important role is played.

The invention relates to the technical field of automobile interior noise control, in particular to an automobile pressure release valve noise control method based on a local resonance acoustic superstructure. The method comprises the steps of obtaining basic data of a target vehicle; carrying out multi-working-condition noise testing based on the basic data of the target vehicle, and determining a main noise frequency; a main radiation source of pressure release valve noise is positioned based on the main noise frequency, and a key path of noise propagation in a vehicle is analyzed; extracting a noise main peak frequency based on the main noise frequency, the main radiation source and the key path, and determining a core noise reduction frequency band; setting a noise reduction target based on the core noise reduction frequency band; constructing a three-dimensional finite element model of the acoustic superstructure based on the basic form of the superstructure; inputting the acoustic superstructure part into the three-dimensional finite element model for simulation analysis; and a simulation analysis result is compared with an initial test result of the target vehicle, a noise reduction effect is analyzed, and the superstructure part is optimized. The sound absorption and insulation structure for specific frequency noise can be designed according to noise sources at the positions of different vehicle types.

An on-frame space portion (14) is formed on a revolving frame (5), the on-frame space portion (14) being surrounded on the front, back, left and right sides by a foot part (4A1) of a lower boom (4A) configuring part of a working mechanism (4), an engine (7) serving as a power source, a cab (9), and a cover member (10), a fuel tank (11) and an operating oil tank (12) serving as a right-side structure. An accumulator (15) and a relief valve (20) are arranged in the on-frame space portion (14). On top of that, the relief valve (20) is located in a position higher than a line connecting part (15A) of the accumulator (15).

The invention belongs to the technical field of volatile organic compound treatment, and particularly discloses an adsorption tank for high-concentration VOCs waste gas treatment, which comprises a tank body for containing activated carbon and treating VOCs waste gas introduced into the tank body; the separation device is arranged in the tank body and is used for dividing the tank body into a plurality of areas, so that the VOCs waste gas can flow through the interior of the tank body along a specified path; the gas inlet pipe is vertically and fixedly inserted into the inner wall of the bottom of the tank body in a penetrating manner and is used for introducing VOCs waste gas into the tank body. Through the double-layer adsorption structure of the main carbon layer and the partition carbon layer, when the main carbon layer is close to saturation, VOCs are temporarily stored by using the partition carbon layer, and VOCs emission in a monitoring-switching gap is avoided; meanwhile, in the desorption process, nitrogen is subjected to closed-loop circulation, a safety valve pressure relief outlet is connected into a system low-pressure area, no VOCs are discharged into the atmosphere in the whole process, the atmosphere pollution defect of an existing device is overcome, and the enterprise environmental protection punishment risk is reduced.

This application provides a control device, method, electronic device, and storage medium for extraction pressure and flow rate, including: a first end of a first electromagnetic pump and a first end of a second electromagnetic pump are both connected to a first end of a flow meter; a second end of the flow meter is connected to a water tank; and the second ends of the first and second electromagnetic pumps are both connected to a first end of a heating boiler module. A water delivery pipe between the second ends of the first and second electromagnetic pumps and the first end of the heating boiler module is connected to the first ends of a first and second pinhole pressure relief valve module, respectively; the second ends of both the first and second pinhole pressure relief valve modules are connected to the water tank. The second end of the heating boiler module is connected to the first end of an extraction solenoid valve, and the second end of the extraction solenoid valve is connected to an extraction head. An extraction pressure sensor is installed between the extraction solenoid valve and the extraction head to ensure sufficient flow rate and water flow for effective and stable coffee extraction.

The utility model relates to the technical field of chemical reagent experiments, in particular to a flask with an explosion-proof function, which comprises a safety plug, the bottom end of the safety plug vertically penetrates through an opening at the top end of a thin bottle neck, a ball bottle body is arranged at the bottom end of the thin bottle neck, and a pressure relief through pipe is arranged on the outer wall of one side of the ball bottle body. And a pressure relief valve obliquely penetrates through the interior of the pressure relief through pipe, one side of the outer portion of the ball bottle body is sleeved with a first protective net sleeve, and one side of the first protective net sleeve is connected with a second protective net sleeve in an adsorption mode. According to the improved flask and the safety plug, automatic pressure adjustment is achieved, a controllable pressure relief channel is formed, the sealing performance and the safety are balanced, the relative positions of the pressure relief valve and the pressure relief hole are changed, high-pressure gas can be conveniently diffused and discharged in a fan shape through the pressure relief hole, the impact force and danger of gas injection are reduced, meanwhile, the pressure relief valve has a reset mechanism, and the safety performance is improved. The first protective net sleeve and the second protective net sleeve can effectively intercept large glass fragments generated when the bottle body is broken, and the large glass fragments are prevented from splashing to hurt people.

Disclosed is a pressure relief valve with inlet and outlet ports, to hold pressure from outlet until a set pressure is achieved at the inlet. The valve has a valve member located between the inlet and outlet ports, movable between an open position to allow a fluid flow between the ports, and closed position to prevent fluid flow. Inlet pressure acts on the valve member to increase its closing force. Provided is a movable sensing spindle in fluid communication with the inlet pressure and a reference pressure, the sensing spindle having a first position, and a second position. Increased pressure difference between the inlet pressure and reference toward the set pressure moves the sensing spindle to eventually acts on the valve member to move it away from it's sealing position and thus provide an opening for fluid to flow from the inlet to the outlet.

The utility model relates to the field of hydrogen storage and distribution, in particular to a hydrogen single-path skid-mounted frame which comprises a frame body, a main pipeline, a rear end pipeline and an emptying pipeline are installed on the frame body, and a stop valve, a needle valve, a first pressure gauge and a first-stage pressure reducing valve are sequentially installed on the main pipeline. The rear-end pipeline is connected with the first-stage pressure reducing valve, a second-stage pressure reducing valve, a ball valve, a pressure release valve, a flow control meter and a second pressure gauge are sequentially installed on the rear-end pipeline, the main pipeline and the rear-end pipeline are both connected with an emptying pipeline, and a one-way valve is installed on the emptying pipeline; an inlet of the main pipeline and an outlet of the rear-end pipeline are connected with purging pipelines; and angle valves are mounted on the purging pipelines. A nitrogen purging pipeline is additionally arranged, the cleanliness of gas in the pipeline can be kept, meanwhile, a pressure release valve is arranged, the first-stage pressure reducing valve and the second-stage pressure reducing valve can be prevented from being damaged, rear end valves can be prevented from being damaged by high-pressure gas, the gas can be exhausted into the atmosphere in time, and safety is enhanced.

This invention provides a fire-fighting water pipeline flow regulation device, comprising an inlet pipe, a shut-off valve for controlling the flow of pressurized water within the pipe, an adjustable filter connected to a flow regulator with a cross-sectional area, and an outlet pipe connected to the other end of the flow regulator. Hose connector end caps are fixedly installed at the ends of the inlet and outlet pipes, and an automatic pressure relief valve with upper and lower chambers is installed at the end of the hose connector end cap. This device addresses the problems of unadjustable flow and pressure, failure to automatically drain residual water leading to accelerated pipe corrosion, and lack of filtration causing blockages. It enables manual adjustment of flow and pressure within the pipe, automatic drainage of residual water, and filtration and anti-blockage of pressurized water within the pipe.

A pressure relief valve that is spring-activated or utilizes a burst disk is described for preventing pipe bursts in a building plumbing system. A control valve system and method for preventing pipe bursts utilizing the pressure relief valve are also described. Also described are spring-activated control valve cartridges and control valve systems utilizing spring-activated control valve cartridges that prevent pipe bursts when installed building plumbing systems. Further described are methods for preventing pipe bursts in building plumbing systems comprising the step of disposing a relief valve or spring-activated cartridge according to the disclosure in a building plumbing system.

In a fuel supply system that supplies gaseous fuel to the engine of a vehicle, the fluid pressure of the discharged gaseous fuel can be adjusted by electronic control, and the fluid pressure of the gaseous fuel can be safely released in the event of a malfunction such as a power supply failure. [Solution] In a fuel supply system 100 that supplies gas fuel to an engine 6, the system includes an electronically controlled regulator 3 that reduces the introduced gas fuel to a set pressure and discharges it, a pressure sensor 7 that detects the fluid pressure of the gas fuel after reduction, and a normally open electromagnetic relief valve 8 provided downstream of the pressure regulating valve of the electronically controlled regulator 3. The electromagnetic relief valve 8 opens when the fluid pressure detected by the pressure sensor 7 reaches a pressure threshold or when the system is not energized, releasing the gas fuel outside the system.

The embodiment of the invention discloses a thermal runaway management method and system.The thermal runaway management system comprises a venturi tube and an exhaust valve, the exhaust valve is arranged on the upstream of the venturi tube, the upstream of the venturi tube communicates with the interior of a battery pack, the downstream of the venturi tube communicates with the exterior of the battery pack, and the venturi tube and the active control exhaust valve work cooperatively; when thermal runaway is detected, the exhaust valve is quickly opened, high-temperature and high-pressure gas in the battery pack is efficiently exhausted by utilizing a Venturi tube effect, and meanwhile, a multi-sensor real-time monitoring and feedback mechanism is combined, so that the response speed and the exhaust efficiency of thermal runaway management are remarkably improved, and thermal runaway diffusion is effectively inhibited; the problems that a traditional pressure release valve is lagged in response and depends on internal pressure are solved, and meanwhile the problems that in a traditional scheme, a battery pack is low in exhaust efficiency, lack of effective cooling dilution and high in secondary combustion risk are solved.

The application provides a coupling system and a control method for improving the variable load rate of a secondary reheat unit integrated with a medium-temperature energy storage, wherein the medium-temperature energy storage system is connected with the high-pressure cylinder outlet through a high-pressure cylinder outlet steam extraction valve during the energy storage process, is connected with the deaerator outlet through a pressure relief valve, is connected with the feed water pump outlet through a deaerator outlet regulating valve during the energy release process, and is connected with the boiler feed water inlet through a pipeline, so as to form a secondary reheat unit integrated with the medium-temperature energy storage; and a load splitting method is provided, which splits the whole unit load instruction into a medium-temperature energy storage system load instruction and a secondary reheat unit boiler coordination system load instruction, and the medium-temperature energy storage system load instruction is realized through high-pressure cylinder exhaust valve opening degree control and deaerator outlet regulating valve opening degree control in the load decreasing and increasing processes; through the coupling system and the load splitting method, the time-space transfer of the unit energy in the variable load process is realized, the variable load rate of the secondary reheat unit is improved, and the flexibility of the unit is enhanced.

A steering system of a commercial vehicle includes a mounting bracket that has a jacket tube disposed inside a fixed mounting tube, a bracket portion connected at a first end to a fluid cylinder, and a second end connected to a pivot part at a first point. The fixed mounting tube has friction flaps. The fluid cylinder has a first end fixed to the mounting bracket, and a second end connected to the pivot part at a second point. When a handle, connected to the fixed mounting tube, is rotated from the closed position to the open position, the friction flaps loosen and permit the mounting bracket to slide relative to the fixed mounting tube. Rotation of the handle also causes a relief valve of the fluid cylinder to open, permit the fluid cylinder to change its length, and permit the pivot part to pivot about the second point.

The utility model relates to the technical field of aluminum ladle liners, and discloses an aluminum ladle liner structure, a liner body is arranged in a ladle body, a sealing cover plate is arranged at the top of the ladle body, a pressure relief valve is fixedly connected to the top of the sealing cover plate, and a spiral guide plate with a plurality of air outlet holes is arranged in the liner body, so that the pressure relief valve is fixedly connected to the top of the sealing cover plate. During work, an external air pump injects gas into the cavity of the spiral flow guide plate through the heat-resistant gas injection pipe and the air inlet channel, the gas is sprayed out of the air outlet holes to push molten aluminum to flow, the spiral flow guide plate guides the molten aluminum to do spiral motion, and a spiral flow field is formed; the spiral flow field and a flow field generated by gas injection are mutually overlapped, axial and radial flow of molten aluminum is strengthened, stirring dead angles are effectively reduced, the molten aluminum circulates more sufficiently in the ladle, stirring is more uniform, temperature distribution of the molten aluminum is optimized, surface solidification of the molten aluminum is avoided, and the quality of the molten aluminum is improved.

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.

The application can relate to the technical field of aero-engine and aero-engine control system, and particularly relates to a pressure pulse resistant pressurization shutoff device and method. The device comprises a main shutoff valve assembly and a pulse pressure relief valve assembly. The pulse pressure relief valve assembly is arranged in a main valve central cavity in the main shutoff valve assembly, a sensing cavity of the pulse pressure relief valve assembly is in communication with a control cavity of the main shutoff valve assembly, an axial blind hole is arranged in the pulse pressure relief valve close to the sensing cavity, a radial pressure relief through hole in communication with the axial blind hole is arranged in the pulse pressure relief valve, a radial main through hole in communication with the central cavity is arranged in the main valve of the main shutoff valve assembly, and the pulse pressure relief valve in the pulse pressure relief valve assembly can slide along the main valve central cavity. When the pressure relief through hole is in communication with the main through hole, pulse pressure relief is realized. The pressurization shutoff device of the fuel regulating mechanism can meet the pressurization shutoff function, can reduce metering fuel pressure pulsation during engine start-stop stage, and has little influence of control cavity fuel pressure pulsation on the function performance. The device has been used in a certain type of aero-engine and has good effect.

This application discloses a retraction device, relating to the field of fully mechanized coal mining technology. The device includes: a main support; and a retraction assembly, which is located inside the main support. The retraction assembly includes an outer frame, a hydraulic cylinder, and a traction rope. This application replaces the traditional long wire rope traction of a winch with a short-distance traction rope driven by a hydraulic cylinder. Combined with a pulley block structure and a closed outer frame design, it significantly shortens the exposed section of the wire rope. Coupled with the overload protection mechanism of the pressure relief valve, it reduces the scope of rope breakage accidents from the source, lowering the risk of injury from slippage caused by wire rope breakage. Simultaneously, it enables single-person remote control operation using a remote control component, eliminating the high-intensity labor of multiple workers repeatedly carrying long wire ropes. Furthermore, the closed structure of the device allows for parallel operation at adjacent workstations, significantly improving the continuity and overall efficiency of retraction, and is particularly suitable for the safe and efficient retraction needs of heavy supports under complex roof pressure conditions.

The utility model discloses a pressure relief valve calibrator for a transformer, and relates to the technical field of transformers, in particular to the pressure relief valve calibrator for the transformer, which comprises a base cylinder, a butt joint cylinder and a U-shaped limiting plate, a gear concentric with the output end of the servo motor is installed at the output end of the servo motor and meshed with a rack rod through teeth, a guide ring is installed on the side face, away from the teeth, of the rack rod, a guide rod is installed on the inner wall of the base cylinder, and a supporting rod is installed at the top of the rack rod. The pressure relief valve calibrator for the transformer has the effects of conveniently limiting the position of the pressure relief valve and preventing the position of the pressure relief valve from deviating during calibration, through cooperation of a gear and a rack rod, a plurality of arc-shaped limiting blocks can conveniently and synchronously move to limit the position of the pressure relief valve, the stability of limiting the position of the pressure relief valve is improved, and the calibration accuracy of the pressure relief valve is improved. And the purpose of improving the practicability is achieved.

This invention relates to the field of gas pipeline safety protection equipment, and discloses a pipeline overcurrent and overpressure protection device, a flame arrester, and a rectifier. The device includes: a housing with an inlet at one end and an outlet at the other end, containing a first cavity and a second cavity, with a first hole and a second hole formed between the first and second cavities; a sealing element slidably disposed within the housing, one end connected to a first spring; and a pressure relief valve disposed on the side wall of the housing, its inner end extending to the second hole for controlling the opening and closing of the second hole. When the upstream gas pressure of the housing exceeds a preset downstream gas pressure value, the sealing element, pushed by the airflow, overcomes the force of the first spring and seals the first hole, maintaining a sealed state and cutting off downstream gas delivery. This pipeline overcurrent and overpressure protection device is integrated into the flame arrester and rectifier, enabling flame arrest and rectification while also cutting off gas delivery in the event of overpressure or overcurrent in the pipeline.

The utility model belongs to the technical field of air-conditioning oil pumps, and particularly relates to an air-conditioning compressor oil pump with a pressure release valve structure, which comprises a main pump body, an oil inlet is arranged on one side of the main pump body, a pressure release valve is fixedly connected with one side of the main pump body and one side of the oil inlet, the main pump body can be conveniently fixed through a fastening opening, and internal threads are arranged, so that the pressure release valve is convenient to use. And the pressure release valve can be conveniently connected with an external pipe fitting. Through the arrangement of the pressure release valve, the oil pressure can be effectively released, so that the use safety of the oil pump is ensured.

An elevation-dependent surgical pneumatic cutting system is provided. The system includes an absolute pressure sensor for sensing an ambient pressure. The system also includes a pressure drive chamber that receives pressurized air, a supply outlet supplies pressurized air to a pneumatic vitrectomy handpiece and a relief exhaust line exhausts pressurized air. A proportional relief valve is in communication with the relief exhaust line. The pressurized air is exhausted through the proportional relief valve when a supplied air pressure, sensed by a line pressure sensor, exceeds a threshold opening pressure. The threshold opening pressure and an open position are set based on feedback from the absolute pressure sensor indicative of the ambient pressure, whereby the threshold opening pressure of the proportional valve and the open position of the proportional relief valve are variable based on the sensed ambient pressure.

This invention discloses a low-temperature melting and filtering device for waste sulfur and its operating method. The device includes a crushing device, a screening device, a conveying device, and a sulfur melting kettle connected in sequence. The sulfur melting kettle is equipped with a heating device and a cooling device. The kettle lid is equipped with a feed valve, a nitrogen filling valve, a tail gas valve, a pressure gauge, a level gauge, a first thermometer, and a pressure relief valve. The nitrogen filling valve is connected to a nitrogen source through a gas pipe. The tail gas valve is connected to an absorption tower through a pipeline, and a first exhaust pump is installed on the pipeline. The bottom of the kettle has a discharge hole. The pressure relief valve is connected to a waste liquid collection tank externally through an overflow pipe. The top of the conveying device is connected to a feed auger, the top of the feed valve is connected to a temporary storage cylinder, and the top of the temporary storage cylinder is connected to the feed auger. The bottom of the kettle has a hinged discharge gate that can seal the discharge hole. The discharge gate has a liquid extraction hole, the top of which has a filter screen, and the bottom of which is connected to a discharge valve. The device and method of this invention have the characteristics of high thermal efficiency and sufficient safety redundancy.

The application relates to the technical field of component detection, and discloses an analysis and detection equipment based on a creatine sodium finished product, which comprises a detection mounting table, a telescopic assembly, a rotating assembly, a power assembly, a temporary storage assembly, a mixing pretreatment equipment and an analysis and detection equipment; the temporary storage assembly comprises a compression bag, a flexible liquid inlet, a one-way valve and a pressure relief valve; through the flexible compression bag and the one-way valve structure of the temporary storage assembly, the application realizes pressure-free injection of the sample, avoids poor liquid inlet or early liquid leakage caused by air pressure imbalance, adopts a servo motor and a speed reducer in cooperation with the power assembly, realizes accurate indexing in cooperation with the rotating assembly, ensures that the temporary storage assembly is stably aligned with the liquid outlet position, realizes controllable pressure liquid outlet through mechanical extrusion of the telescopic assembly, realizes stable sample delivery, non-deviation and uniform flow, and realizes smooth connection with the mixing pretreatment equipment, so that the creatine sodium detection precision and efficiency are greatly improved, and the structure is stable and reliable and easy to maintain.

The utility model discloses a pressure vacuum relief valve which comprises an electromagnetic driving head, a sealing cover, a valve plate and a valve body, the electromagnetic driving head is arranged at the end of the valve body, a valve port is arranged in the middle of the valve body, the valve plate is arranged in the valve port, a connector is arranged at the bottom of the valve body, and the sealing cover capable of being opened laterally is arranged on the outer side of the valve port. The top of the valve body is provided with the sealing cover which is automatically opened and closed through the electric push rod, the valve port can be sealed through the sealing cover, the valve plate which is automatically opened and closed through the electromagnetic driving head is arranged in the valve port, and the sealing effect is greatly improved through double-layer sealing of the valve plate and the sealing cover. The valve plate is arranged in the valve body, the electromagnetic driving head is arranged at the end of the valve body, intelligent control over the valve plate is facilitated through the electromagnetic driving head, and the first sealing ring is arranged on the side of the sealing cover.

According to the heating and ventilation system provided by the invention, the refrigerant leaked in the indoor units is conveyed to the heat source side pipeline through the pressure relief pipeline communicating with the heat source side pipeline and the indoor side pipeline, so that when the refrigerant block valve of any indoor unit is closed, the refrigerant is blocked; according to the heating and ventilation system, the pressure relief valve corresponding to the indoor unit can be opened through the pressure relief pipeline corresponding to the indoor unit to discharge refrigerants leaked in the indoor unit and the indoor side pipeline to the heat source side pipeline, the pipe explosion phenomenon of the indoor unit and the indoor side pipeline due to refrigerant accumulation is avoided, and the use safety of the heating and ventilation system is improved.