70 results about "Pressure decrease" patented technology

The disclosure relates to a leak detection system for a pneumatic braking system of a vehicle. The pneumatic braking system has a control unit, a pneumatic circuit, and an air tank configured to supply pneumatic pressure to the pneumatic circuit. The pneumatic circuit has a plurality of valves configured to be individually controlled by the control unit. The link detection system includes program code configured, when executed by a processor, to individually control the valves of the pneumatic circuit so as to isolate a sub-circuit of the pneumatic circuit. The leak detection module is configured to monitor a pressure in the pneumatic circuit for leaks, wherein the leak detection module detects a leak in the sub-circuit if the pressure decreases while the sub-circuit is isolated.

An air pressure management device includes: a temperature conversion air pressure calculation unit that calculates a temperature conversion air pressure based on acquired temperature and air pressure of a tire; an air pressure decrease rate calculation unit that calculates an air pressure decrease rate from a change in the temperature conversion air pressure for a predetermined period, the rate indicating a declining trend of the air pressure; an air pressure decrease rate threshold value setting unit that sets an air pressure decrease rate threshold value corresponding to an acquired thermal history amount using a threshold value table, the threshold value table specifying the air pressure decrease rate threshold value associated with the thermal history amount regarding the tire; and a first determination unit that determines whether the air pressure is abnormal based on the calculated air pressure decrease rate and the set air pressure decrease rate threshold value.

A grapple hydraulic cylinder may comprise a barrel body, a piston-rod assembly, a cap operably connected to the barrel body, and a pressure relief system. The pressure relief system may be operably connected to a rod side chamber and a cap side chamber. The pressure relief system may comprise a first valve and a second valve. The second valve may be a relief valve configured to open upon the cap side chamber reaching a determined pressure and moving hydraulic fluid from the cap side chamber to the rod side chamber while the first valve simultaneously maintains the locked position. Pressure in the cap side chamber is reduced, and pressure in the rod side chamber increases. A similar configuration may be utilized to move hydraulic fluid from the rod side chamber to the cap side chamber to reduce pressure in the rod side chamber.

The application is a gradually expanding high-pressure hydrogen pressure reducing valve, comprising: a first valve body with an air inlet; a second valve body fixed on the top of the first valve body, with a pressure reducing cavity between the first valve body and the second valve body; an air outlet on the second valve body; a guide in the pressure reducing cavity; a valve core through the guide; a first elastic member with a spring seat between the bottom of the valve core; an adjusting mechanism on the top of the second valve body, suitable for adjusting the limit stroke of the valve core; a plurality of pressure reducing channels on the surface of the valve core; the pressure reducing channels comprise N pressure reducing grooves connected in a head-to-tail manner, the two connected pressure reducing grooves are arranged in an inclined manner, the first pressure reducing groove to the Nth pressure reducing groove, and the width and depth of the pressure reducing grooves gradually increase; the pressure reducing channels are used for reducing the pressure of hydrogen, and the pressure of high-pressure hydrogen can be reduced to the use range by using a one-stage pressure reducing structure, the structure is simple and compact, small in size, light in weight, and good in reliability.

A manufacturing apparatus includes a chamber, a pressure reducing device, and a return pipe. The pressure reducing device is configured to reduce the pressure in the chamber. The return pipe includes a first opening, a conduit, and a second opening. The first opening and the second opening are respectively and independently open to the interior of the chamber. The first opening is connected to an exterior body. The conduit connects the first opening and the second opening. The conduit is configured to once draw gas in the exterior body out of the chamber when the pressure in the chamber is reduced, and return the drawn gas into the chamber.

The utility model relates to a pressure reducing valve device with a waterproof function, which comprises a valve body, an oxygen bottle connector is arranged at the opening end of the valve body, a connecting part is arranged between the oxygen bottle connector and the valve body, and the valve body and the oxygen bottle connector are fixedly connected through the connecting part. When the pressure of oxygen in an external oxygen bottle is reduced, the pressure in the oxygen bottle connector is reduced, at the moment, the spring pushes the valve element to move towards the oxygen bottle connector, the bottom end of the air hole is driven to move synchronously, and when the bottom end of the air hole moves to be communicated with the alarm pipeline, the water-proof sealing structure is closed. Therefore, gas can be discharged into the alarm pipeline through the air hole, penetrates through the one-way valve and then is discharged from the bottom end of the alarm pipeline, bubbles are formed underwater, a user is reminded of insufficient oxygen pressure, and the problem that the underwater welding quality can be seriously affected due to the fact that the oxygen pressure is insufficient and a welding rod cannot be fully combusted is avoided as much as possible.

This technology provides a way to determine the state of air control valves and flow paths used in vehicle brakes without requiring any special operation. [Solution] The state determination device 100 is a state determination device 100 that determines the state of at least one of an air control valve and a flow path used in a vehicle brake, and the air control valve includes an acquisition unit 110 that discharges air at an output pressure corresponding to the input pressure, which is the pressure of the introduced air, into a supply flow path to the brake cylinder, acquires first measured values ​​of the input pressure and output pressure at one or more timings during the pressure-increasing period when the input pressure increases, and acquires second measured values ​​of the input pressure and output pressure at one or more timings during the pressure-reducing period when the input pressure decreases, a calculation unit 120 that calculates the difference between at least one of the input pressure and output pressure during the pressure-increasing period and the pressure-reducing period based on the first measured value and the second measured value, and a determination unit that determines the state of at least one of the air control valve and the flow path according to the difference.

To improve the environmental performance of a Wankel-type internal combustion engine and improve rotation performance.SOLUTION: A rotational force is obtained by using pressure when combustion pressure is maximum, so that the combustion pressure can be received as strongly as possible in a desired direction. The pressure decreases as a combustion chamber volume increases, and the pressure decreases as a temperature decreases. Thus, in a Wankel-type internal combustion engine, a large area of a plane for receiving the combustion pressure in a normal rotation direction is achieved, and other faces are served as faces concentric about a rotor center which do not hinder the rotation. When the vicinity of an apex of a face facing a reverse rotation direction which hinders the rotation is hidden behind a rotor housing, a value of receiving the combustion pressure in the normal rotation direction becomes maximum, at which ignition is performed. Since fuel injection timing is set slightly before the ignition for the purpose of not generating HC, there is no time for mixing as a mixed gas, which allows a combustion under the presence of spots. Also, since the fuel is injected in a small volume, the ignition is facilitated even under a significant lean state.SELECTED DRAWING: Figure 1

The invention relates to a pressure maintaining experiment method and system for detecting leakage of a soot blowing system. The method comprises the following steps that S1, a soot blowing steam electric isolation door, an inlet door and a drainage door are opened; s2, the system control valve pressure is set to be a first preset pressure value, drainage operation is carried out, and a first time period is timed; s3, after timing is finished, the control valve pressure of the system is reduced to a second preset pressure value, and after a second time period is delayed, the water blowing and draining valve is closed; s4, closing the isolation door, completely closing the override of the control valve of the system, carrying out a pressure maintaining test, and timing for a third time period; s5, monitoring the pressure change in the system in real time, and determining the final pressure value of the system; s6, judging the state of the system according to the pressure change data in the system; when the final pressure value is larger than the preset pressure threshold value, the system does not leak; if the final pressure value is reduced to 0, the system breaks down. Compared with the prior art, the method has the advantages of timely detection, high reliability and the like.

A method for determining properties of hydraulic fractures from measurements of pressure in a well made after stopping pumping fracturing fluid into the well (shut in) includes determining a first time after shut in whereinafter a decrease in measured pressure is caused by fluid leak off in a fracture. A second time after shut in is determined whereinafter the decrease in pressure is caused by fluid leak off, fracture growth and fluid pressure equilibration in the fracture. A third time after shut in is determined whereinafter the decrease in pressure is caused by fluid leak off, fracture growth, fluid pressure equilibration in the fracture and pressure drop in a near wellbore zone. Values of fluid efficiency, minimum stress and net pressure which are determined result in a calculated pressure with respect to time matching the pressure measurements within a predetermined threshold.

An alert system for use with a subsea infrastructure is presented. The alert system 400 includes a pressure detection apparatus 410 connectable to the subsea infrastructure 405; a signalling device; and a release mechanism 420 operable between a locked state in which the signalling device is attached to the alert system, and an unlocked state in which the signalling device is released from the alert system. The alert system 400 releases the signalling device upon detection of a pressure variation at a point of interest on the subsea infrastructure above a first threshold value when the pressure variation is due to an increase in pressure, or below a second threshold value when the pressure variation is due to a decrease in pressure. Also presented is a method of monitoring a subsea infrastructure using the alert system.

An interface bonding failure test method, system, storage medium and program product, relate to the field of testing or analyzing materials by means of determining chemical or physical properties of materials, in the method, the interface bonding state between the pole piece coating and the current collector is evaluated by performing a single loading and unloading cycle. In the loading stage, a first resistance value is measured when the pressure reaches a preset target detection pressure, and then the pressure is continuously increased to a preset peak pressure (the pressure is greater than the target detection pressure but less than the yield strength of the current collector). In the unloading stage, a second resistance value is measured when the pressure decreases back to the preset target detection pressure. By comparing the difference between the two resistance values with a preset hysteresis threshold, the interface bonding state is determined: if the difference is greater than the threshold, it is determined that there is interface bonding failure. The present application is used to reduce the difficulty of identifying overpressure risk and defining the best roll pressure process window.

A leak control system (26) for an evacuation system (12) of an insufflation system (1), for controlling leakage of insufflating gas from a vessel (5) of a subject being insufflated. An evacuation conduit (20) connects a Venturi vacuum creating device (14) to the vessel (5) through a pressure relief valve (27) operable from a closed state to an open state in response to a pressure drop across the pressure relief valve (27) in the direction of the arrow A exceeding a predefined pressure drop value. The vacuum creating device (14) is operable in response to a signal from a pressure sensor (10) detecting pressure in the cavity (5) exceeding a predefined pressure value for applying a vacuum to the evacuating conduit (20) to increase the pressure drop across the pressure relief valve (27) to the predefined pressure drop value, for in turn operating the pressure relief valve (27) into the open state. On the pressure in the vessel (5) being reduced below the predefined pressure value, the vacuum creating device (14) is deactivated, and the pressure relief valve (27) transitions into the closed state, thereby preventing further leakage of insufflating gas though the Venturi vacuum creating device (14).

The invention discloses a full-premixing gas water heating equipment control method and device, equipment and a medium. When the current rotating speed of a fan reaches the maximum rotating speed of the fan and flame ion flow is smaller than or equal to a current threshold value, the pressure difference between the air pressure of a premixer and the gas pressure of the premixer is reduced, and a corrected pressure difference value is obtained; the opening degree of the gas proportional valve is adjusted, so that the pressure difference value between the air pressure and the gas pressure is equal to the corrected pressure difference value, and due to the fact that the corrected pressure difference value is smaller than the pressure difference value obtained through calculation based on the current rotating speed of the draught fan, when the air pressure is reduced, the pressure difference value is also reduced, and the gas pressure needing to be reduced is reduced; the reduction range of the opening degree of the gas proportional valve is reduced, the problem that smoke exceeds the standard or flames out due to excessive reduction of the opening degree of the gas proportional valve is avoided, and the environment-friendly performance and the operation stability of the full-premixing gas water heating equipment are improved.

A partition wall for dividing an aircraft cabin into individual sections, having at least one opaque air passage for enabling a pressure reduction between the sections through the partition wall. The wall also includes a frame and at least one stress-free planar element which is inserted into the frame. The at least one air passage is formed by a structure, a suspension in the frame, or both.

The invention relates to a method for controlling the valve (60) of a pressure relief valve (50) of a fluid device (10) of a vehicle, comprising the steps of providing (62) the pressure relief valve (50), which is configured to trigger a pressure reduction of the fluid in at least one fluid branch (42, 44) of the fluid device (10) when the valve is in the open position, the pressure reduction of which depends on an opening time of the pressure relief valve (50), and performing (64) a pressure reduction process (66) to reduce the fluid pressure (p) in the fluid branch, with a first pressure reduction step (68) comprising opening (70) the pressure relief valve (50) with a predetermined first opening time (t1), wherein during the pressure reduction process (66) and subsequently after the first pressure reduction step (68), the fluid pressure (p) in the fluid branch (42) reduced by the pressure reduction of the first pressure reduction step (68) is detected (72). 44),A comparison (76) of the detected fluid pressure (p) with a target fluid pressure (ps) and a specification (78) of a second opening time (80) to be applied for a subsequent second pressure reduction step (80) when the pressure relief valve (50) is opened, depending on the comparison (76), are performed. The invention further relates to a method for pressure reduction (84), a pressure relief valve (50), and a fluid device (10).

This invention relates to a drive system for a vehicle, the vehicle being at least partially powered by hydrogen (H2), the drive system comprising: a storage tank (1) for liquid hydrogen (H2) having a tank heating device (6); and an operation and consumption prediction module (10) configured to determine the amount of hydrogen (H2) required to reach a driving destination. vor ); and a control unit (12) for the tank heating device (6). The drive system of the present invention is characterized by having a pressure prediction module (11) configured to determine the desired target pressure (p) in the tank (1) to be reached upon arrival at the destination. End The required amount of hydrogen (H2) consumed (consumption) ges ), wherein the control unit (12) is configured to input the demand (consumption) vor ) and consumption (consumption) ges The two are compared with each other, and the consumption (consumption) is recorded. ges ) is greater than or equal to the demand (consumption) vor In the event of a shortage of water, the tank heating device is shut down (6), while the demand (consumption) is reduced. vor ) greater than the consumption (consumption) ges In the event of [a situation where] the tank heating device (6) is activated. Furthermore, the present invention relates to a method for controlling the consumption (consumption) in a pressure prediction module (11). ges This method performs model-based calculations. The drive system can be applied to vehicles.

The invention relates to a regulator (2) for compressed gas comprising: a body (4) having a gas inlet (6), a gas outlet (8) and a gas passage (10) fluidly interconnecting the gas inlet (6) and the gas outlet (8); a pressure reducer (14) having a shut-off device and a movable component in the gas passage (10), the movable component being operatively connected to the shut-off device and defining, together with the body (4), a regulation chamber (14.6) downstream of the shut-off device; a pressure relief device (16) in the gas passage (10) downstream of the regulation chamber (14.6); and a flow restrictor (22) in the gas passage (10) upstream of the shut-off device, the flow restrictor (22) being sized to reduce the gas pressure at the gas outlet (8) below a maximum pressure value when the pressure relief device (16) is open and the shut-off device is open.

The invention provides a work machine with improved convenience. An air compressor (10) is provided with a tank section (20), a compression section (40), and a control section (100). The tank part (20) stores compressed air. The compression unit (40) delivers compressed air to the tank unit (20). The control unit (100) includes a pressure sensor (108) that detects the pressure inside the tank unit (20). The control unit (100) is capable of executing a compression unit diagnostic control for diagnosing whether or not maintenance of the compression unit (40) is necessary on the basis of the driving time of the compression unit (40) and the pressure of the tank unit (20), and a tank unit diagnostic control for diagnosing whether or not maintenance of the compression unit (40) is necessary. The tank diagnosis control diagnoses whether or not maintenance of the tank (20) is necessary on the basis of the elapsed time from the point in time at which driving of the compression unit (40) is stopped and the amount of pressure reduction of the tank (20).

The invention relates to a brake system, comprising at least two wheel brake cylinders (RZ1-4), at least one electrically driven pressure supply (DV), at least one liquid storage tank (VB), at least one electronically controlled regulating device (ECU), at least two switching valves (SVi = 1-4), each of the at least two wheel brake cylinders (RZ1-4) is part of a separate wheel circuit (RK1-4), and the electrically driven pressure supply (DV) is at least used for establishing a pressure increase (Pauf) and a pressure decrease (Pab) in the wheel brake cylinders (RZ1-4), each wheel brake cylinder (RZ1-4) being connected to a switching valve (SVi = 1-4) via a respective hydraulic connection line. The switching valve (SVi = 1-4) is used for disconnecting and connecting the hydraulic connection of the corresponding wheel brake cylinder (RZ1-4) to at least one further hydraulic main line, the switching valve (SVi = 1-4) is connected or can be connected to at least the pressure supply (DV) via the at least one further hydraulic main line, and the switching valve (SVi = 1-4) is a normally open two-position two-way valve, according to the invention, at least the hydraulic connection line (HLRK1-4) and the wheel brake cylinder (RZ1-4) connected to the hydraulic connection line (HLRK1-4) are parts of a wheel circuit (RK1-4), and at least one switching valve (SVi = 1-4) or all switching valves (SVi = 1-4) do not have a check valve or do not have a check valve connected in parallel with the switching valve (SVi = 1-4), providing various measures alone or in combination, the switching valve (SVi = 1-4) is prevented from being closed when the pressure (Pab) is reduced through the switching valve (SVi = 1-4).

[Problem] To provide a lift generating device for an aircraft and a thrust generating device for an aircraft that are capable of generating lift and thrust, respectively, using dynamic pressure which is generated when a disc member is rotated. [Solution] A lift generating device (10) for an aircraft comprises: a circular or annular disc member (11); a rotational drive mechanism (12) that rotationally drives a disc member (11); a lift generating mechanism (13) that generates lift (F) with dynamic pressure which is generated in the vicinity of an upper surface of the disc member (11) when the disc member (11) is rotationally driven; an annular pressure reduction chamber (14) that is formed by the disc member (11) and a disc body (6) in a region in the vicinity of a lower surface of the disc member (11); a plurality of sealing means (15A, 15B) that seal the pressure reduction chamber (14) such that air does not enter therein; a vacuum pump (16) that is capable of reducing the pressure inside the pressure reduction chamber (14) to a preset reduced-pressure state; and a plurality of thrust bearing means (17) that are provided inside the pressure reduction chamber (14) and between the disc member (11) and the disc body (6).

This utility model relates to the field of seat cushion technology and discloses a slow-rebound spring breathable seat cushion, including a base, a flexible pad on the top of the base, a fitting groove at the top of the base, and several ventilation grooves at the bottom of the base. Several first mounting grooves are formed on the inner wall of the fitting grooves, and a fixing cylinder is fixedly installed on the inner wall of each of the first mounting grooves. When a person sits on the flexible pad, the pressure causes the sleeve and piston rod to move downwards. Part of the pressure is discharged to the outside through the ventilation grooves, and part flows into the ventilation holes through the connecting holes to reduce the stuffiness near the flexible pad and achieve breathability. At the same time, the spring is compressed and stores energy, which can disperse the pressure. After the pressure decreases, the spring releases energy and resets, and the piston rod simultaneously resets upwards. The space inside the fixing cylinder expands to form a negative pressure, and outside air enters through the ventilation grooves at the bottom of the base and is drawn in through the through holes of the fixing cylinder to replenish it. Finally, the flexible pad returns to its initial shape, achieving a slow-rebound effect and avoiding instantaneous bounce.

The present invention discloses an electromagnetic valve device with pressure reduction and quick start, comprising a valve body, a driving coil, a valve core assembly and a closing spring. The valve core assembly comprises a moving iron core, a main sealing cover and a limiting sleeve fixed on the moving iron core. A pressure relief port is provided on the main sealing cover. The moving iron core and the main sealing cover can be relatively moved a certain distance and a limiting structure is provided between the two. When the driving coil is energized, the moving iron core rises and moves under the action of electromagnetic force, and drives the limiting sleeve to overcome the spring force and generate displacement between the moving iron core and the main sealing cover, first opening the pressure relief port, and then the moving iron core drives the main sealing cover to move upward synchronously through the limiting structure, thereby reopening the main valve port. When the electromagnetic valve device of the present invention is energized, the pressure relief port is first opened to relieve pressure, and after the pressure is reduced, the main valve port can be easily opened to obtain a higher working pressure, thereby achieving pressure reduction and quick start, reducing production costs, and improving the market competitiveness of the product.

The utility model provides a kind of hydraulic damping device of anti-leakage, including main cylinder body and the main piston of sliding installation in the main cylinder body, the main piston separates the inner cavity of the main cylinder body into first cavity and second cavity, pressure reducing valve is installed in the first cavity, the pressure reducing valve includes the pressure reducing cylinder body being placed in the first cavity and the pressure reducing piston of sliding installation in the pressure reducing cylinder body, one end of the pressure reducing cylinder body is provided with pressure reducing hole, the inner cavity of the pressure reducing cylinder body is communicated with the first cavity by the pressure reducing hole, the pressure reducing piston is used to open and close the pressure reducing hole;When the pressure in the first cavity is too large, hydraulic oil will push away the pressure reducing piston and enter the pressure reducing cylinder body by the pressure reducing hole, so that the pressure of the first cavity is reduced;A kind of hydraulic damping device of anti-leakage provided by the utility model overcomes the defect that existing hydraulic damping device is prone to oil leakage.

A pressure regulator designed to reduce high incoming vapor pressure to a lower, outlet vapor pressure.

The utility model relates to the technical field of flue pressure regulation and control, in particular to a flue pressure fluctuation releaser which comprises a flue communicated with a boiler, a notch is formed in the flue, a flexible sealing cover is arranged at the notch in a sealing mode, a buffering cavity is formed in the flexible sealing cover, and when pressure in the flue changes, the buffering cavity is communicated with the notch. And a buffer cavity in the flexible sealing cover becomes larger or smaller so as to reduce pressure fluctuation in the flue. According to the utility model, the pressure fluctuation in the flue is effectively relieved. When a boiler runs, pressure fluctuation generated by combustion can cause pressure change in a flue. According to the device, through the buffer cavity in the flexible sealing cover, an extra space can be provided for containing part of flue gas when the pressure is increased, so that the increasing speed of the pressure in the flue is reduced. On the contrary, when the pressure is reduced, the flexible sealing cover can be pressed into the flue, more space is occupied, and the reduction speed of the negative pressure or the influence of the negative pressure is reduced.

A fine bubble generating nozzle may include a nozzle unit and a baffle. The nozzle unit may include: an inlet; a pressure decreasing portion configured to decrease a pressure of a gas-dissolved pressurized water introduced from the inlet; a first collision chamber disposed downstream of the pressure decreasing portion and including a first collision wall with which the gas-dissolved pressurized water introduced from the pressure decreasing portion collides so that a flow direction of the gas-dissolved pressurized water changes; a second collision chamber disposed downstream of the first collision chamber and including a second collision wall with which the gas-dissolved pressurized water having flowed through the first collision chamber collides so that the flow direction of the gas-dissolved pressurized water changes; and an outlet. The baffle may be disposed outside of the nozzle unit and is disposed at a position facing the outlet.

To provide a tire pressure reduction detection system, a tire pressure reduction detection method, and a program that can suppress the decrease in accuracy of pressure reduction detection of pneumatic tires caused by changes in the type of pneumatic tire. [Solution] The tire pressure reduction determination system comprises: a first acquisition processing unit 51A that acquires the rotational speed of a tire mounted on a vehicle 1A; a second acquisition processing unit 54A that acquires the resonant frequency of the tire based on the acquired rotational speed; a replacement determination processing unit 58A that determines whether the difference between the acquired resonant frequency and a reference frequency exceeds a first determination value; and a change processing unit 59 that changes a threshold used in the pressure reduction determination process that determines whether the tire is depressurized or not when it is determined that the difference between the resonant frequency and the reference frequency exceeds the first determination value.

The application relates to a stable pressure relief self-resetting pressure relief structure arranged on a shell, which comprises a front cover, a movable piece and an elastic element, the front cover is fixedly installed on the shell, a sliding hole is arranged on the front cover, the movable piece penetrates through the sliding hole and can slide along the axial direction of the movable piece, the size of the two ends of the movable piece is larger than the radial size of the sliding hole, the elastic element is arranged along the axial direction of the movable piece, one end of the elastic element is in abutting fit with the front cover, the other end of the elastic element is in abutting fit with one end of the movable piece, the elastic element is linked with the movable piece, the front cover is further provided with an exhaust hole and a pressure relief hole which are in communication with the inside and outside of the shell, when the movable piece is in a natural state, one end of the movable piece closes the pressure relief hole, when the movable piece moves axially, the pressure relief hole is opened. The application can automatically relieve pressure when the pressure is high, can automatically reset when the pressure is reduced, can keep a relatively stable pressure state in the shell, has high reliability, good stability and is not prone to failure.

The utility model discloses a fixture for gluing a mask substrate, and belongs to the field of mask plate gluing. The fixture for gluing the mask substrate comprises a base with a placement groove, first sealing rings are arranged at the four corners in the placement groove in a surrounding mode, supporting columns are arranged in the middles of the interiors of the four first sealing rings, first air exhaust cavities are formed in the supporting columns, and communicating cavities are formed in the base in a surrounding mode. The fixture solves the problem that the lower end of a whole mask substrate of an existing fixture is uniformly adsorbed by one sealing ring, the error-tolerant rate is poor, the interior of the containing groove is divided into four areas, the four areas conduct independent adsorption and assist with one another, the pressure of the adsorption position is continuously detected through the pressure sensor in the adsorption process, and the adsorption efficiency is improved. And after the pressure is reduced, the piston head at the lower end of the second sealing ring longitudinally slides to provide additional adsorption force for adsorption.