28results about How to "Avoid reverse flow" patented technology

The utility model discloses a rotary valve structure of a dust cup of a dust collector, which comprises an outer dust cup, a plurality of first cavities are arranged in the outer dust cup, a first communication hole is arranged on a partition plate, and the outer dust cup is provided with a first dust discharge port corresponding to a dust discharge channel of a base station of the dust collector; and the inner dust cup is rotationally connected to the partition plate and provided with a second communicating hole and a second dust discharging opening, and a linkage piece corresponding to a rotary guide groove in the dust collector base station is arranged on the outer side of the inner dust cup. The outer dust cup and the inner dust cup form a rotary valve structure, so that when the dust collector host and a base station are assembled in a butt joint manner, the linkage piece is matched with the rotary guide groove to rotate the inner dust cup, each dust collection cavity and a corresponding filtering structure are blocked, and dust is prevented from flowing reversely when garbage in the dust cups is discharged and recycled; and dust, hair and dirt with different particle sizes intercepted by the dust collection cavities are discharged respectively, dirt and garbage blockage in the dust discharge channel is avoided, and therefore it is guaranteed that the dust collector is used neatly, conveniently and efficiently.

The utility model discloses an anti-backfire three-pipe injection type cutting torch, and belongs to the technical field of welding tools. The rear connecting body comprises an oxygen connector and a fuel gas connector; the cutting torch and the oxygen connector can be communicated with the cutting torch through a cutting oxygen pipe and an oxygen pipe respectively, the gas connector is communicated with the cutting torch through a gas pipe, fire stopping pipes and fire arresting valves are arranged in the oxygen connector and the gas connector, the fire stopping pipes are located on the front sides of the fire arresting valves, the fire stopping pipes are used for resisting tempering, and the fire arresting valves are used for preventing gas backflow. Gas can pass through the fire stopping pipe, but the fire stopping pipe can stop flames, so that the flames can be quickly prevented from flowing back to a gas supply system when backfire occurs, and the backfire phenomenon is resisted; the safety guarantee is further increased through the fire-retardant valve, the gas can be prevented from reversely flowing backwards from the cutting torch under any condition, it is ensured that the gas flow direction can be cut off even under the abnormal condition, and potential risks are avoided.

The invention provides a device capable of collecting and detecting a liquid sample in a time sequence, which comprises a noninvasive liquid sample collecting and sensing detection module, the non-invasive liquid sample collection and sensing detection module comprises a liquid sample flow channel in a Tesla valve form, a liquid sample inlet communicated with an inlet of a reverse channel of the liquid sample flow channel, and a liquid sample outlet communicated with an outlet of the reverse channel of the liquid sample flow channel; the liquid storage cavities are respectively communicated with each curve section of the liquid sample flow channel in the Tesla valve form, and electrodes of the electrochemical sensor are arranged close to the bottom ends of the liquid storage cavities. According to the device capable of collecting and detecting the liquid samples in the time sequence, the liquid storage cavities connected to the Tesla valve in series can effectively prevent liquid from flowing reversely through the design of the structure and the length, sweat detection of different time sequences can be achieved through the characteristic that the reverse flowing speed of the Tesla valve is low, and data changes of sweat are analyzed.

This application relates to the field of air conditioning technology, specifically providing a heat exchanger, an outdoor air conditioning unit, and an air conditioner, aiming to solve the problem that heat exchangers cannot simultaneously meet the flow path requirements of cooling and heating modes. The heat exchanger includes: a first main pipe comprising two branch main pipe sections; at least two sets of heat exchange tube groups, each set of heat exchange tube groups correspondingly connected to a branch main pipe section, including a first sub-tube group and a second sub-tube group, the first sub-tube group including a first branch pipe group and a second branch pipe group; a first control valve disposed between a first connection node of the first sub-tube group and a branch main pipe section and a second connection node of the second sub-tube group and a branch main pipe section; multiple second main pipes correspondingly connected to each set of heat exchange tube groups; second control valves disposed between a third connection node of the first branch pipe group and a second main pipe and a fourth connection node of the second branch pipe group and a second main pipe; and refrigerant distributors respectively connected to the multiple second main pipes. This solution can have different refrigerant flow paths in different modes.

The utility model relates to the technical field of hydraulic one-way valves, and discloses an SAE flange type stacked one-way valve, which comprises an equipment main body, the equipment main body comprises an SAE flange plate, and one end of the SAE flange plate is provided with a screw through hole; the valve element is arranged to be responsible for controlling flowing of liquid, closing and opening are achieved through contact with the limiting ring, the size is small, the manufacturing process is simple, the spring is arranged, oil liquid is controlled to pass through through the restoring force of the spring, the valve element can be rapidly closed, and when the valve element is closed, a closed environment is formed between the valve element and the limiting ring; oil can only flow in one direction, certain opening pressure is achieved, reverse flowing of fluid is prevented, a sealing ring is arranged, after the fixing plug screw is in threaded connection with the inner wall of the liquid outlet pipe, the fixing plug screw and the valve seat can be fastened through the sealing ring, the sealing performance is enhanced, the structure is simple, the occupied space is small, and the cost is saved; the practicability of the device is effectively enhanced.

The utility model discloses a current switching circuit, which comprises software interlocking control, forced cut-off control, MOS (Metal Oxide Semiconductor) drive and dual power supply switching, the software interlocking control circuit controls the MOS driving circuit through two output ends, and the forced cut-off control circuit is connected with the MOS driving circuit through an input end; the MOS driving circuit comprises two driving circuits which are respectively corresponding to two paths of power supplies. According to the utility model, large current switching is optimized, the stability is high, and compared with a relay, the service life is longer and safer; anti-backflow protection and anti-reverse connection protection are arranged, so that one-way flow of current is ensured; software interlocking ensures single-path power supply output, and misoperation is avoided; the power supply has the functions of self-turn-off and forced turn-off when the microcontroller fails, adapts to different power requirements, and is low in cost and high in reliability.

The utility model discloses a desulfurizing tower valve convenient to control flow, which relates to the technical field of desulfurizing tower valves and comprises a main body, the inside of the main body is fixedly connected with two ends of a fixed plate, the inside of the fixed plate is fixedly connected with the tail end of a push rod, the front end of the push rod is fixedly connected with a movable plate, and a through hole is arranged on the fixed plate. The device is provided with a flow control structure, when the device is used, gas enters the device from the left side of a main body, and at the moment, a push rod in a fixed plate can be started through a controller to drive a moving plate in front of the push rod to move in the fixed plate; the through holes are blocked through movement of the moving plate so as to control the flow of gas, meanwhile, the moving mechanism can be started to drive the front push plate to move, and due to the fact that the push plate and the through holes in the body are arranged in a staggered mode, when the distance between the push plate and the interior of the body is larger, the flow speed is higher, and the flow can be better controlled; by means of the structure, the flow can be better controlled.

The utility model provides an unmanned ship power supply equalization circuit and a device thereof, the unmanned ship power supply equalization circuit comprises control circuits which are respectively corresponding to a plurality of groups of lithium batteries in number and are connected, the control circuits are arranged in parallel, each control circuit comprises an external N-channel MOSFET and an ideal diode control chip, and the external N-channel MOSFET is connected with the ideal diode control chip. The ideal diode control chip is connected to a grid electrode of the external N-channel MOSFET, and the ideal diode control chip is used for controlling conduction and reverse connection and disconnection of the external N-channel MOSFET. The unmanned ship power supply device comprises the unmanned ship power supply equalization circuit. According to the utility model, the batteries can provide different currents or currents with small voltage difference under the condition that the voltage difference is large or small, balanced power supply is carried out, and the endurance time can be prolonged under the condition that the capacity of a single battery is not increased.

The utility model relates to the technical field of switch cabinets, and discloses a high-low voltage switch cabinet heat radiation structure comprising a switch cabinet body, the front surface of the switch cabinet body is provided with an upper ventilation opening and a lower ventilation opening, the front surface of the switch cabinet body is provided with a dust cover, and the dust cover is located on the front surfaces of the ventilation openings. The lower end of the switch cabinet body is provided with an air exhaust assembly, the air exhaust assembly is located right behind the lower ventilation opening, the front end of the air exhaust assembly is communicated with the ventilation openings, and the rear end of the air exhaust assembly is connected with a flow guide assembly. According to the utility model, due to the arrangement of the diversion assembly, the windward area of the diversion member can be matched with the area of the inner cavity of the ventilation opening under the cooperation of the exhaust assembly, so that the downward projection surface of the switch cabinet can be rapidly filled with the entered airflow at the lower end of the switch cabinet through the diversion groove, and the airflow filled in the switch tube can rise simultaneously; therefore, the effect of preventing the barrier from blocking the airflow to enable the airflow to flow reversely is achieved.

The invention relates to the technical field of valves, and discloses a wet dust removal system water seal check valve inner water seal anti-breakdown device which comprises a valve body, the valve body is communicated with a water supplementing pipe and a water draining pipe, an air inlet pipe is fixedly installed on the valve body and penetrates through the side wall of the valve body, and the valve body is communicated with an air outlet pipe corresponding to the air outlet end of the air inlet pipe. A first support located at the end of the air outlet pipe is fixedly installed in the valve body, a first telescopic rod is fixedly installed on the first support, and a cover used for sealing the end of the air inlet pipe is fixedly installed at the end, away from the first support, of the first telescopic rod. A partition plate is fixedly installed in the valve body, and a protective cylinder coaxial with the cover is fixedly installed on the partition plate. The liquid seal valve has the beneficial effects that after the lower cavity in the valve body is filled with purified water, the purified water cannot flow in the valve body, so that the liquid level cannot incline or generate agitation when the valve body vibrates and inclines, it is guaranteed that the cover is located below the liquid level all the time, and the stability of liquid seal is guaranteed.

The invention discloses a float valve tray with high efficiency and mass transfer rate, and relates to the technical field of trays, the float valve tray is used for being mounted in a separation tower, the float valve tray comprises a tray, a plurality of mounting holes are formed in the tray, and float valves capable of moving up and down are arranged in the mounting holes of the tray; the floating valve comprises a valve body and a valve cover, the interior of the valve body is hollow, the hollow valve body is communicated with the mounting hole, and a plurality of rectangular through holes are formed in the radial surface of the valve body; a plurality of circular through holes are formed in the radial surface of the valve body, and the section size of the circular through holes is smaller than that of the rectangular through holes. The valve has the effect of accurately controlling fluid circulation.

The utility model relates to the technical field of ventilation vertical holes, in particular to a ventilation vertical hole with an air control function, which comprises a ventilation barrel with an upper opening and a lower opening, a plurality of ventilation openings are uniformly and annularly arranged on a barrel body of the ventilation barrel at intervals in the circumferential direction, sliding doors capable of being opened and closed in a sliding manner are arranged on the inner sides of the ventilation openings, and outward opening doors capable of being opened and closed are hinged to the outer sides of the ventilation openings; a top plate is arranged at an upper opening of the ventilating barrel; wherein the ventilator body is provided with a limiting piece used for limiting the opening angle of the outward opening door. According to the utility model, the outward opening door can be opened, and then the sliding door is opened according to the ventilation demand, that is, when the ventilation demand is changed, the change of the ventilation demand can be adapted through the opening and closing degree of the sliding door, so that the technical problem that the air volume of other places of a mine cannot meet the demand is solved.

The utility model discloses a lemon air pressure sprays medicine and mist drop integration device belongs to medicine and mist drop technical field, a lemon air pressure sprays medicine and mist drop integration device, including storage kettle, fixedly connected in the handle of storage kettle lateral wall and integrative in the outer thread interface of storage kettle top mouth part, the outer thread interface is detachably connected with the internal thread cover, the top end inboard fixedly connected with the cover of top opening formula structure setting of internal thread cover, the bottom end lead -through connection of cover has the plastic pipe of extending to the inboard of storage kettle, the inner chamber bottom of cover integrative has the pressure relief chamber, and the top end of pressure relief chamber is provided with the pressure relief mouth, the inboard of pressure relief chamber is installed with first return spring, the top end of first return spring is connected with the sealing ball for sealing pressure relief mouth, it does not need manual pressure, and the labor intensity of manual in the operation process is reduced.

The invention relates to the technical field of aerospace equipment, in particular to a propellant adjusting device which comprises a main shell, an adjusting part and a driving part, the main shell is provided with a working cavity, an inlet and an outlet, the inlet and the outlet are communicated with the working cavity, the inlet and the outlet are communicated through a communicating cavity, and the main shell is provided with a sliding part in the working cavity; the adjusting part comprises an adjusting head and a penetrating rod which are connected with each other, the penetrating rod penetrates through the sliding part in a sliding mode, the penetrating rod can slide relative to the sliding part and adjust the opening degree of the communicating cavity, a first movable sealing part and a second movable sealing part are arranged between the penetrating rod and the sliding part, and the first movable sealing part and the second movable sealing part are arranged in the sliding direction of the penetrating rod in a spaced mode; a discharging cavity is formed between the penetrating rod and the sliding part and located between the first movable sealing piece and the second movable sealing piece, the sliding part is provided with a discharging hole communicating with the discharging cavity, and the driving piece is used for driving the penetrating rod to slide. According to the propellant adjusting device provided by the invention, the sealing performance between the main shell and the adjusting part is further improved, and reliable supply of the propellant is ensured.

This invention discloses a high-pressure hot water thermal energy storage phase change constant-pressure system and method for compressed air energy storage power stations, belonging to the field of compressed air energy storage. It includes an atmospheric pressure cold water storage tank, at least one high-pressure hot water storage tank, an energy storage heat exchanger, an energy release heat exchanger, a cold water circulation pump, and a constant-pressure system. A steam space is reserved at the top of the high-pressure hot water storage tank. The constant-pressure system includes a condenser and a high-pressure hot water buffer tank. The constant-pressure system maintains the pressure stability inside the high-pressure hot water storage tank by condensing steam and buffering pressure fluctuations. During energy release, the hot water is driven by the steam pressure inside the high-pressure hot water storage tank, eliminating the need for a hot water circulation pump. This invention, through cold and hot water separation, steam phase change constant-pressure design, and a pump-free design, significantly reduces the number and pressure levels of high-pressure hot water storage tanks, lowers equipment investment, and simultaneously improves thermal storage temperature and system efficiency, providing an efficient and economical solution for the large-scale application of compressed air energy storage power stations.

A deep tillage and fertilization machine includes a deep tillage component for deep tillage of soil, a fertilizer output component for outputting liquid fertilizer, and a gear transmission component respectively connected to the deep tillage component and the fertilizer output component, wherein the gear transmission component is connected to a power device to obtain power, and is characterized in that: the fertilizer output component is connected to the deep tillage component to form a material guide passage, and the material guide passage guides the fertilizer output from the fertilizer output component into the deep tillage soil as the deep tillage component moves. When the present invention performs deep tillage on the soil, the fertilizer is introduced into the soil layer from top to bottom as the deep tillage component goes deeper, forming deep fertilization along the deep tillage path of the soil, combining the deep tillage and deep fertilization structures together, realizing the synchronous action of deep tillage and deep fertilization, improving the reliability, efficiency and automation level of deep tillage and deep fertilization, improving the mixing effect of soil and fertilizer, extending the duration of soil fertility, and providing a high-quality soil environment for crops.

The utility model discloses a compressor, and relates to the technical field of compressor exhaust, the compressor comprises a compressor body, a main exhaust pipe, a one-way exhaust assembly and a pressure relief assembly, the compressor body is provided with an exhaust system; the main exhaust pipe is arranged on the outer wall of the compressor body and communicates with the exhaust system; the one-way exhaust assembly is arranged at the end, away from the compressor body, of the main exhaust pipe and communicates with the main exhaust pipe; the pressure relief assembly is arranged on the periphery of the main exhaust pipe and communicates with the main exhaust pipe. According to the technical scheme, the problem that surge is generated when an existing compressor operates is solved.

This utility model discloses a burr-removing device for hardware processing, relating to the field of hardware grinding technology. It includes a fixed base plate, a support frame mounted on the top of the fixed base plate, and a pneumatic telescopic rod slidably connected to the top of the support frame. The output end of a drive motor is equipped with a position adjustment mechanism for adjusting the position of the grinding component. This burr-removing device rotates the output end of the drive motor, causing a threaded rod to rotate. A movable block is threadedly connected to the outer side of the threaded rod, and a slider is connected to the bottom end of the movable block. Therefore, the slider can move the pneumatic telescopic rod and the grinding component, allowing the position of the grinding component to be flexibly adjusted according to the grinding requirements of the hardware. Simultaneously, during grinding, the position of the hardware can be finely adjusted by adjusting the position of the limiting plate through the grinding component. The hardware can move and adjust its position within the range inside the placement groove.

The invention relates to a breeding boar semen quality detection sampler and a quality detection device, and belongs to the technical field of breeding boar semen quality detection. Comprising a negative pressure generation chamber and a positive pressure generation chamber; the N samplers are provided with standard accommodating cavities and compensation accommodating cavities; the standard accommodating cavity is communicated with the positive pressure generating chamber; the compensation accommodating cavity is communicated with the negative pressure generation chamber; the standard accommodating cavity and the compensation accommodating cavity are in one-way communication; and the volumes V1 of the standard cavities of the N samplers are equal. The volume V1 of the standard containing cavity of each sampler is accurately controlled, so that the consistency of the amount of semen sampled and dropped each time is ensured, and the influence of manual operation on a detection result is reduced. By arranging the sampler groups with different heights, different layers of the seminal fluid of the breeding boar after precipitation and layering are sampled, the overall quality of the seminal fluid of the breeding boar can be comprehensively reflected, and interference of a layering phenomenon on a detection result is avoided.

This invention discloses a rotary valve structure for a vacuum cleaner dust cup, comprising: an outer dust cup with multiple first cavities inside, a first connecting hole on a partition, and a first dust discharge port corresponding to the dust discharge channel of the vacuum cleaner base station; and an inner dust cup rotatably connected to the partition, with a second connecting hole and a second dust discharge port, and a linkage component on the outer side of the inner dust cup corresponding to a rotating guide groove on the vacuum cleaner base station. This invention, through the outer and inner dust cups forming a rotary valve structure, allows the inner dust cup to rotate in conjunction with the rotating guide groove during assembly of the vacuum cleaner main unit and the base station. This rotation blocks the dust collection cavities and their corresponding filter structures, preventing backflow of dust during dust cup discharge and recycling, which could contaminate the filter structure. It also allows for the separate discharge of dust, hair, and other dirt of different particle sizes trapped in each dust collection cavity, preventing blockage of the dust discharge channel and ensuring the cleanliness, convenience, and efficiency of the vacuum cleaner.

The present invention provides an emergency power supply management circuit for a single three-phase electric meter and a single three-phase electric meter. The circuit includes a power management chip, including an LDO constant current charging module, a boost module and a diode D2; a voltage stabilizing unit, including capacitors C4 and C5, for stabilizing the LDO output voltage; a supercapacitor, for storing the energy required for emergency power supply; and an MCU, which is the power consumption end of the emergency power supply management circuit and is used for controlling and monitoring the electric meter. The present invention can effectively provide a stable voltage output when the power supply is interrupted, ensuring the stable operation and rapid response of the system in an emergency.

The utility model provides a check valve, a motor system and a vehicle. The check valve comprises a shell, and an inlet and an outlet are formed in the two ends of the shell correspondingly; the movable part is rotationally connected into the shell and is provided with an opening position and a closing position; and the non-return part is movably arranged in the shell, and the non-return part can be matched with the movable part, so that the movable part rotates from the opening position to the closing position, reverse flowing of fluid is prevented, and the action reliability of the non-return valve is guaranteed.

The utility model relates to the field of check valve equipment, disclose a railway locomotive is with board type filter dust check valve, including valve shell, the front surface fixed mounting of valve shell has the reinforcing rib, the inside of valve shell is provided with check assembly, check assembly is used for the check protection effect of water flow in the valve shell, the inner wall of valve shell still is provided with mounting assembly, mounting assembly is used for the installation of check assembly's supplementary. In the utility model, through the mutual cooperation of check plate, ring spring, installation rod and other spare parts in the equipment, ensure the sealing property and fluency of flow channel opening and closing, the elastic drive mechanism of ring spring makes check plate open automatically when the forward water flow, resets quickly when the reverse water flow, response sensitive and check reliable, the cooperation of installation rod, vice pole and mounting seat, guarantee the stability of check plate rotation, effectively prevent fluid reverse flow, guarantee the one -way flow safety of railway locomotive fluid pipeline system.

The utility model relates to the technical field of automobile valve manufacturing, in particular to a one-way valve and a two-way stop valve of an automobile thermal management system, which comprise a valve casing, a valve cavity arranged in the valve casing, a first annular limit retaining edge arranged in the valve cavity, a runner outlet arranged at one end of the valve cavity, and a runner inlet arranged at the other end of the valve cavity. The limiting cover is arranged at one end, corresponding to the flow channel outlet, of the valve cavity; a second annular limiting blocking edge is arranged on the periphery of the valve plug, the valve plug is movably arranged in the valve cavity and limited between the first annular limiting blocking edge and the limiting cover, the second annular limiting blocking edge is limited by the first annular limiting blocking edge in the process that the valve plug moves towards the flow channel inlet, and a sealing ring is hooped on the valve plug. The sealing ring abuts against the side, close to the first annular limiting blocking edge, of the second annular limiting blocking edge. The spring abuts against the valve plug and applies elastic force towards the inlet direction of the flow channel to the valve plug. Abnormal sound and damage caused by impact between the valve element and the valve body in the using process can be reduced.

The utility model discloses an activating device for producing drinking water, and belongs to the technical field of water treatment equipment. The utility model discloses an activation device for producing drinking water, which comprises an activation box, the diversion pipeline is fixedly mounted in the activation box, and two ends of the diversion pipeline penetrate through the activation box and are connected with a water inlet pipe and a water outlet pipe; the at least one group of permanent magnet array part is fixedly mounted on the flow guide pipeline and is used for forming a uniform and strong magnetic field environment, and a high-performance permanent magnet array is combined with the magnetic field enhancing part, so that water flow is subjected to strong and uniform magnetic field action when passing through, a hydrogen bond network among water molecules is effectively changed, and a water molecule cluster becomes small; and the spiral channel prolongs the retention time of the water flow in the magnetic field, enhances the interaction between water molecules and the magnetic field, and further improves the magnetization effect.

The utility model discloses a continuous wet-type crushing and ball-milling system which comprises a grinding machine and a ball mill, a feeding device is arranged at the upper part of a grinding cylinder of the grinding machine, a transmission grinding device is arranged in the grinding cylinder, and the grinding machine grinds materials through a blade tool bit; a transmission ball-milling device is arranged in a ball-milling barrel of the ball mill and comprises a stirring rod, the periphery of the stirring rod is filled with ball-milling beads, a double-layer screen plate is arranged below the stirring rod, and the ball mill conducts ball-milling treatment on materials through the stirring rod and the ball-milling beads. According to the utility model, a mechanochemical shearing-ball milling mixed extraction technology is applied to natural plant extraction, a seamless continuous process from material crushing to extraction is realized through the grinder and the ball mill, the grinding and extraction efficiency and effect are remarkably improved, meanwhile, large-scale continuous production is supported, the safety and reliability of the production process are guaranteed, and the production cost is reduced. And the operation complexity and cost are reduced, and the requirements of modern production are better met.

The utility model provides an intelligent mobile direct-current power supply system, which belongs to the technical field of standby power supplies and comprises a charging part and a power storage part electrically connected with the charging part, an ampere meter is mounted in the charging part, an ampere meter and a voltmeter are mounted in the power storage part, and the charging part comprises at least one charging module. The input end of the charging module is connected with an alternating current input unit, the output end of the charging module is connected with a direct current power supply line, the other end of the direct current power supply line is connected with a control bus, a bus voltmeter and a direct current monitoring module are installed on the control bus, and the power storage part comprises a storage battery which is connected with the control bus of the charging part through a connecting wire. The charging part and the power storage part are respectively integrated in the moving mechanism, and the two parts can be independently operated or quickly combined to adapt to various scenes, so that the flexibility and the reliability of the mobile direct-current power supply system are remarkably improved, and the limitation that a traditional integrated power supply cannot be used in a split manner is solved.

The utility model provides an improved stable air delivery device for air compressors, which comprises a plurality of air compressors, the plurality of air compressors are connected to a branch air cylinder through an air storage delivery system, the air storage delivery system comprises a plurality of independent air storage delivery units in one-to-one correspondence with the plurality of air compressors, each air storage delivery unit comprises an air storage tank, and the air storage tank is connected with the branch air cylinder. The air inlet end of the air storage tank is communicated with the air outlet end of the corresponding air compressor through a first branch pipeline, the air outlet end of the air storage tank is communicated with the branch air cylinder through a second branch pipeline, and a check valve is arranged on the second branch pipeline. Compared with the prior art, the air compressor control system has the advantages that the independent air storage tanks are arranged for the multiple air compressors respectively, any number of air compressors can be started according to production requirements, work of the air compressors does not interfere with one another, air supply stability is kept, and a certain damping effect can be achieved; in addition, the check valve is arranged on the second branch pipe behind the air storage tank, reverse flowing of airflow can be prevented, and the air supply stability of the air compressor is further improved.