High-voltage safety protection device of oxygen generator and protection method of high-voltage safety protection device

Abstract

The invention relates to a high-pressure safety protection device of an oxygen generator and a protection method thereof.The high-pressure safety protection device of the oxygen generator comprises a piston cylinder arranged in a machine shell, a first air outlet and a second air outlet in the piston cylinder are communicated with a distribution valve in the machine shell, the distribution valve is communicated with two groups of molecular sieves in the machine shell through an air inlet pipeline, and the first air outlet and the second air outlet are communicated with the molecular sieves in the machine shell. A pressure release valve is arranged on the molecular sieve; a pumping assembly is arranged in the machine shell and comprises a reciprocating part and a driving structure, and the driving structure can drive the reciprocating part to do reciprocating action, so that gas is conveyed to the distribution valve through the first gas outlet and the second gas outlet; an adjusting assembly is further arranged in the machine shell and connected with the driving structure, and when the exhaust rate of the molecular sieve and the pressure release valve is smaller than the gas conveying rate of the piston barrel, the adjusting assembly can adjust the driving structure, so that the movement stroke of the reciprocating part is adjusted, and the situation that the pressure intensity in the molecular sieve is gradually increased is avoided; and the oxygen generator is prevented from exploding.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oxygen generator, in particular to a high-pressure safety protection device of an oxygen generator and a protection method thereof. BACKGROUND

[0002] With the gradual enhancement of people's demand for health, oxygen therapy has entered people's life, oxygen can effectively adjust the physiological state of the body, correct the disease of hypoxia, at the same time, the rich oxygen can improve people's demand for modern high-quality life comfort, therefore, the oxygen generator gradually enters the ordinary family and life, office and entertainment environment.

[0003] When the oxygen generator is working, if the oxygen outlet is blocked, high pressure will occur in the oxygen generator, which is specifically manifested as the increase of the pressure in the molecular sieve; at present, the existing oxygen generator uses a pressure relief valve to protect the oxygen generator from high pressure, when the pressure in the molecular sieve reaches a certain value, the pressure relief valve will automatically open to release pressure; however, the pressure relief valve has hysteresis when used, which can easily lead to the failure of timely release of overpressure, at this time, the oxygen production rate of the oxygen generator is greater than the discharge rate, the pressure in the molecular sieve is in a state of cumulative increase, which can cause the explosion of the molecular sieve, resulting in low safety performance of the oxygen generator. SUMMARY

[0004] The purpose of the present application is to provide a high-pressure safety protection device of an oxygen generator and a protection method thereof to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: A high-pressure safety protection device of an oxygen generator, comprising: A piston cylinder is arranged in the casing, a first gas outlet and a second gas outlet on the piston cylinder are in communication with a distribution valve arranged in the casing, the distribution valve is in communication with two groups of molecular sieves arranged in the casing through two groups of gas inlet pipelines, and a pressure relief valve is arranged on the molecular sieve; A pumping assembly is arranged in the casing, the pumping assembly comprises a reciprocating member and a driving structure, the reciprocating member is sealingly and slidingly arranged in the piston cylinder, and the driving structure is actuated to drive the reciprocating member to reciprocate, so as to transport compressed gas to the distribution valve through the first gas outlet and the second gas outlet; An adjusting assembly is further arranged in the casing, the adjusting assembly is connected with the driving structure, and when the exhaust rate of the molecular sieve and the pressure relief valve is less than the gas conveying rate of the piston cylinder, the adjusting assembly can adjust the driving structure, so as to adjust the movement stroke of the reciprocating member.

[0006] The high-pressure safety protection device of the oxygen generator has the advantages that the first chamber is arranged in the piston cylinder, the second chambers are arranged on the left and right sides of the first chamber, and the moving pieces are arranged in the second chambers.

[0007] The high-pressure safety protection device of the oxygen generator has the advantages that the moving piece comprises a moving plug which is sealingly and slidingly arranged in the second chamber, the moving plug is slidingly connected with a fixed rod arranged in the second chamber, a spring is sleeved on the fixed rod, one end of the spring is abutted against the bottom of the piston cylinder, and the other end of the spring is abutted against the moving plug.

[0008] The high-pressure safety protection device of the oxygen generator has the advantages that the reciprocating piece comprises a piston disc which is slidingly arranged in the piston cylinder, a piston rod is arranged on the piston disc, a reciprocating plate is arranged at the middle segment position of the piston rod, and a sliding groove is formed in the side of the reciprocating plate away from the piston cylinder.

[0009] The high-pressure safety protection device of the oxygen generator has the advantages that the driving structure comprises a rotating rod which is rotatably arranged in the shell, a rotating disc is coaxially arranged on the rotating rod, a work-shaped piece is slidingly arranged on the rotating disc, a sliding rod is arranged on the work-shaped piece, the sliding rod is slidingly arranged in the sliding groove, and the work-shaped piece is hingedly connected with a lifting sleeve which is sleeved on the rotating rod.

[0010] The high-pressure safety protection device of the oxygen generator has the advantages that the adjusting assembly comprises a sleeving ring which is rotatably connected with the lifting sleeve, and the sleeving ring is fixedly connected with a motorized telescopic rod arranged in the shell.

[0011] The high-pressure safety protection device of the oxygen generator has the advantages that the adjusting assembly comprises a sleeving ring which is rotatably connected with the lifting sleeve, and the sleeving ring is fixedly connected with a motorized telescopic rod arranged in the shell. Step one: the motor is started, the rotating rod drives the rotating disc to continuously rotate in the same direction under the cooperation of the gear set, in the process, the sliding rod cooperates with the sliding groove to drive the reciprocating plate to drive the piston disc to reciprocate, so as to transport compressed gas to the distribution valve through the first gas outlet and the second gas outlet; Step two: the distribution valve distributes gas to the two groups of molecular sieves through the gas pipeline, and in the distribution process, the pressure sensor monitors the pressure in the molecular sieve in real time; Step three: when the pressure sensor detects that the pressure is too large, the motorized telescopic rod acts, pulls the sleeving ring to drive the lifting sleeve to descend, so that the sliding rod is close to the axis of the rotating disc, thereby shortening the movement stroke of the reciprocating plate, reducing the gas conveying rate of the piston cylinder, and preventing the pressure in the molecular sieve from continuously increasing.

[0012] Compared with the prior art, the high-pressure safety protection device of the oxygen generator has the advantages that By setting the piston cylinder, the piston cylinder has high pumping effect by cooperation between the driving structure and the reciprocating part, which can continuously and quickly pump air to the distribution valve, thereby improving the overall oxygen production efficiency of the oxygen generator. Meanwhile, by setting the adjusting assembly, when the internal pressure of the molecular sieve increases to a certain value, the pressure relief valve opens to release pressure, and at the same time, the pressure sensor can monitor the pressure inside the molecular sieve in real time. Once it is monitored that the gas input rate is greater than the exhaust rate, there is a risk of continuous accumulation of internal pressure of the molecular sieve, the pressure sensor will drive the adjusting assembly to act, thereby reducing the gas input rate of the piston cylinder, so that the exhaust rate of the oxygen generator matches the gas input rate, so as to maintain the internal pressure of the molecular sieve within a safe range, thereby improving the use safety of the oxygen generator. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic view of the high-pressure safety protection device of the oxygen generator.

[0014] Figure 2 It is a structural schematic view of the other side of the high-pressure safety protection device of the oxygen generator.

[0015] Figure 3 It is a structural schematic view of the cooperation between the adjusting assembly and the piston cylinder in the high-pressure safety protection device of the oxygen generator.

[0016] Figure 4 It is a structural schematic view of the cooperation between the piston cylinder and the reciprocating part in the high-pressure safety protection device of the oxygen generator.

[0017] Figure 5 It is a structural schematic view of the inside of the piston cylinder in the high-pressure safety protection device of the oxygen generator.

[0018] Figure 6 It is a structural schematic view of the cooperation between the adjusting assembly and the driving structure in the high-pressure safety protection device of the oxygen generator.

[0019] Figure 7 It is a structural schematic view of the adjusting assembly in the high-pressure safety protection device of the oxygen generator.

[0020] In the figure: 1, the machine shell; 2, the molecular sieve; 3, the piston cylinder; 301, the first air inlet; 302, the second air inlet; 303, the first air outlet; 304, the second air outlet; 305, the first chamber; 306, the second chamber; 4, the motor; 5, the electric telescopic rod; 6, the gear set; 7, the rotating rod; 8, the rotating disc; 801, the through slot; 9, the air inlet pipeline; 10, the piston rod; 11, the reciprocating plate; 1101, the sliding groove; 12, the I-shaped piece; 1201, the sliding rod; 13, the distribution valve; 1301, the gas input pipeline; 14, the piston disc; 15, the moving plug; 1501, the through hole; 16, the fixed rod; 17, the spring; 18, the hinged rod; 19, the lifting sleeve; 20, the sleeving ring. Detailed Implementation

[0021] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0022] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0023] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented even without certain specific details. In some instances, methods, means, and elements well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0024] Please see Figures 1-7 In this embodiment of the invention, a high-pressure safety protection device for an oxygen generator includes: A piston cylinder 3 is installed inside the housing 1. The first air outlet 303 and the second air outlet 304 on the piston cylinder 3 are connected to a distribution valve 13 installed inside the housing 1. The distribution valve 13 is connected to two sets of molecular sieves 2 installed inside the housing 1 through two sets of air inlet pipes 9. The molecular sieves 2 are equipped with pressure relief valves. For details, please refer to Figure 3 , Figure 4 , Figure 5 The piston cylinder 3 is also provided with a first air inlet 301 and a second air inlet 302.

[0025] Specifically, the first air inlet 301, the second air inlet 302, the first air outlet 303, and the second air outlet 304 are all connected to the piston cylinder 3 through a one-way valve, so that the piston cylinder 3 can normally receive outside air through the first air inlet 301 or the second air inlet 302, and then the air supplied to the piston cylinder 3 is delivered to the distribution valve 13 through the first air outlet 303 or the second air outlet 304.

[0026] The aforementioned distribution valve 13 is connected to two sets of molecular sieves 2 through the air inlet pipe 9. The air supplied to the distribution valve 13 by the piston cylinder 3 will undergo nitrogen and oxygen separation in the distribution valve 13 and enter the molecular sieve 2, ultimately resulting in a high concentration of oxygen.

[0027] For details, please refer to Figure 5, the piston cylinder 3 is provided with a first chamber 305, and the left and right sides of the first chamber 305 are respectively provided with a second chamber 306, and the two groups of second chambers 306 are respectively provided with a moving piece; The moving piece comprises a moving plug 15 sealingly and slidingly arranged in the second chamber 306, the moving plug 15 is slidingly connected with a fixed rod 16 arranged in the second chamber 306, a spring 17 is sleeved on the fixed rod 16, one end of the spring 17 abuts against the bottom of the piston cylinder 3, and the other end abuts against the moving plug 15; Preferably, the above-mentioned fixed rod 16 is equidistantly arranged in three groups around the circumferential direction of the piston cylinder 3, and the springs 17 on the three groups of fixed rods 16 are always in a compressed state, and the two groups of moving plugs 15 have a tendency to move close to each other, so that in the initial state, the two groups of moving plugs 15 are in close contact with the first chamber 305.

[0028] The casing 1 is provided with a pumping assembly, the pumping assembly comprises a reciprocating piece and a driving structure, the reciprocating piece is sealingly and slidingly arranged in the piston cylinder 3, and the driving structure can drive the reciprocating piece to reciprocate, so that compressed gas is transported to the distribution valve 13 through the first gas outlet 303 and the second gas outlet 304; The reciprocating piece comprises a piston disc 14 slidingly arranged in the piston cylinder 3, the piston disc 14 is provided with a piston rod 10, a middle segment position of the piston rod 10 is provided with a reciprocating plate 11, and a sliding groove 1101 is formed in the side of the reciprocating plate 11 away from the piston cylinder 3; It should be noted that the diameter of the above-mentioned first chamber 305 is smaller than the diameter of the second chamber 306, a through hole 1501 is formed in the moving plug 15, and the diameter of the piston disc 14 is the same as that of the first chamber 305; When the piston disc 14 is driven to slide to the left in the first chamber 305 (refer to Figure 5 Description), the left side air is compressed, the air in the left part of the first chamber 305 enters the second chamber 306 through the through hole 1501, and then is transported to the distribution valve 13 through the first gas outlet 303, accompanied by the continuous movement of the piston disc 14, the piston disc 14 is in close contact with the moving plug 15, and drives the moving plug 15 to slide to the left synchronously, at this time, the through hole 1501 is blocked by the piston disc 14, and the spring 17 is further compressed, and by sliding the moving plug 15 in the large-diameter second chamber 306, the gas can be quickly transported to the distribution valve 13 for subsequent gas distribution work of the distribution valve 13; At the same time, the first chamber 305 space on the right side of the piston disc 14 is increased, and the ambient air is supplemented into the right chamber through the second air inlet 302, and when the piston disc 14 is driven to slide to the right side, the piston cylinder 3 delivers gas to the distribution valve 13 through the second air outlet 304, and the piston cylinder 3 is supplemented with air through the second air inlet 302; under the cooperation of the first air outlet 303 and the second air outlet 304, gas can be continuously and quickly pumped to the distribution valve 13, thereby improving the speed of subsequent oxygen production.

[0029] Specifically, please refer to Figure 2 , Figure 3 , Figure 6 , Figure 7 , the driving structure includes a rotating rod 7 rotatably installed in the shell 1, the rotating rod 7 is coaxially fixed with the output shaft of the motor 4 fixedly installed on the shell 1 through a gear set 6, and a rotating disc 8 is coaxially arranged on the rotating rod 7, a workpiece 12 is slidably arranged on the rotating disc 8, a slide rod 1201 is arranged on the workpiece 12, the slide rod 1201 is slidably arranged in the sliding groove 1101, and the workpiece 12 is hinged to the lifting sleeve 19 sleeved on the rotating rod 7 through the hinge rod 18. Specifically, the workpiece 12 is slidably arranged in the through groove 801 along the diameter direction of the rotating disc 8, and the gear set 6 includes a driving gear and a driven gear, the driving gear is coaxially fixed with the output shaft of the motor 4, and the driven gear is coaxially fixed with the rotating rod 7.

[0030] In the initial state, the distance between the workpiece 12 and the axis of the rotating disc 8 is maximum, and due to the cooperation of the adjusting assembly in the shell 1, the position of the workpiece 12 can always remain unchanged at the current position, and the reciprocating plate 11 is located at the middle position of the piston cylinder 3 (at this time, the piston disc 14 is located at the middle position of the first chamber 305, as shown in the state of Figure 5 When oxygen production is performed, the motor 4 is started, and then the motor 4 can drive the rotating rod 7 and the rotating disc 8 to continuously rotate in the same direction under the cooperation of the gear set 6, in this process, the slide rod 1201 on the workpiece 12 slides in the sliding groove 1101, and simultaneously drives the reciprocating plate 11 to reciprocate along the axial direction of the piston cylinder 3, so that the piston cylinder 3 can alternately deliver gas to the distribution valve 13 through the first air outlet 303 and the second air outlet 304; subsequently, the air entering the molecular sieve 2 through the distribution valve 13 will be treated by the molecular sieve 2 to discharge high-concentration oxygen.

[0031] However, in the actual oxygen production and oxygen exhaust process, the oxygen exhaust pipeline inside the oxygen generator will be blocked, at this time, the pressure inside the molecular sieve 2 will gradually increase, when the internal pressure of the molecular sieve 2 reaches a certain value, the pressure relief valve on the molecular sieve 2 will automatically open to release pressure; at the same time, the pumping rate of the distribution valve 13 has not decreased, if the sum of the exhaust rate of the pressure relief valve and the exhaust rate of the exhaust pipeline is less than the gas conveying rate of the distribution valve 13 at this time, the pressure inside the molecular sieve 2 will be in a state of continuous increase, resulting in an explosion.

[0032] In the embodiment of the present application, when the above-mentioned situation occurs, the gas conveying rate of the distribution valve 13 can be reduced by adjusting the adjusting assembly, so that the gas conveying rate of the distribution valve 13 matches the sum of the exhaust rate of the pressure relief valve and the exhaust rate of the exhaust pipeline, thereby avoiding the continuous increase of the pressure inside the molecular sieve 2, to ensure the safety of the oxygen generator.

[0033] In detail, please refer to Figure 2 , Figure 3 , Figure 6 , Figure 7 , the adjusting assembly is connected with the driving structure, when the exhaust rate of the pressure relief valve and the exhaust rate of the exhaust pipeline are less than the gas conveying rate of the piston cylinder 3, the adjusting assembly can adjust the driving structure, thereby adjusting the movement stroke of the reciprocating member; The adjusting assembly comprises a sleeve ring 20 rotatably connected with the lifting sleeve 19, the sleeve ring 20 is fixedly connected with the electric telescopic rod 5 arranged in the cabinet 1, and the electric telescopic rod 5 is controlled by the pressure sensor arranged on the molecular sieve 2 (not shown in the figure); In combination with the above, in the initial state, the electric telescopic rod 5 is in the stretched state, the sleeve ring 20 forces the lifting sleeve 19 to approach the rotating disc 8, at this time, under the connection of the fixed-length hinged rod 18, the distance between the workpiece 12 and the axis of the rotating disc 8 is maximum, so that when the rotating disc 8 rotates, the movement stroke of the reciprocating plate 11 is maximum.

[0034] When the pressure sensor detects that the gas conveying rate of the distribution valve 13 does not match the overall exhaust rate of the oxygen generator, the pressure sensor will send a signal to the electric telescopic rod 5 to make the electric telescopic rod 5 retract, forcing the sleeve ring 20 to pull down the lifting sleeve 19, so that the workpiece 12 approaches the axis of the rotating disc 8 along the through groove 801, thereby shortening the movement stroke of the reciprocating plate 11, reducing the pumping amount of the piston cylinder 3 to the distribution valve 13, and then reducing the gas conveying rate of the distribution valve 13, in combination with the pressure relief of the pressure relief valve, so that the internal pressure of the molecular sieve 2 does not continuously increase, thereby protecting the oxygen generator and avoiding the situation that the internal pressure of the oxygen generator is too large and an explosion occurs.

[0035] The application further provides a method for the high-pressure safety protection device of the oxygen generator. Step one: start the motor 4, under the cooperation of the gear set 6, the rotating rod 7 drives the rotating disc 8 to rotate continuously in the same direction, in the process, the sliding rod 1201 cooperates with the sliding groove 1101 to drive the reciprocating plate 11 to drive the piston disc 14 to move reciprocally, thereby delivering the compressed gas to the distribution valve 13 through the first gas outlet 303 and the second gas outlet 304; Step two: the distribution valve 13 distributes the gas to the two groups of molecular sieves 2 through the gas delivery pipeline 1301, in the distribution process, the pressure sensor monitors the pressure in the molecular sieve 2 in real time; Step three: when the pressure sensor detects that the pressure is too large, the electric telescopic rod 5 acts, pulls the sleeved ring 20 to drive the lifting sleeve 19 to descend, so that the sliding rod 1201 is close to the axis of the rotating disc 8, thereby shortening the movement stroke of the reciprocating plate 11, reducing the gas delivery rate of the piston cylinder 3, and preventing the pressure in the molecular sieve 2 from continuously increasing.

[0036] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and the present application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the foregoing description, and all changes falling within the meaning and range of equivalency of the essential elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be regarded as limiting the claims to which they belong.

[0037] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A high-pressure safety protection device for an oxygen generator, comprising: A piston cylinder (3) is installed inside the housing (1). The first air outlet (303) and the second air outlet (304) on the piston cylinder (3) are connected to a distribution valve (13) installed inside the housing (1). The distribution valve (13) is connected to two sets of molecular sieves (2) installed inside the housing (1) through two sets of air inlet pipes (9). The molecular sieves (2) are equipped with pressure relief valves. The feature is that: A pumping assembly is provided inside the housing (1). The pumping assembly includes a reciprocating component and a drive structure. The reciprocating component is sealed and slidably disposed inside the piston cylinder (3). When the drive structure is activated, it can drive the reciprocating component to reciprocate, thereby delivering compressed gas to the distribution valve (13) through the first air outlet (303) and the second air outlet (304). An adjustment component is also provided inside the housing (1). The adjustment component is connected to the drive structure. When the exhaust rate of the molecular sieve (2) and the pressure relief valve is less than the gas delivery rate of the piston cylinder (3), the adjustment component can adjust the drive structure, thereby adjusting the motion stroke of the reciprocating component.

2. The high-pressure safety protection device for an oxygen generator according to claim 1, characterized in that, The piston cylinder (3) is provided with a first chamber (305), and a second chamber (306) is provided on the left and right sides of the first chamber (305). The two sets of second chambers (306) are respectively provided with moving parts.

3. The high-pressure safety protection device for an oxygen generator according to claim 2, characterized in that, The movable component includes a movable plug (15) that is slidably disposed in the second chamber (306). The movable plug (15) is slidably connected to a fixed rod (16) disposed in the second chamber (306). A spring (17) is sleeved on the fixed rod (16). One end of the spring (17) abuts against the bottom of the piston cylinder (3), and the other end abuts against the movable plug (15).

4. The high-pressure safety protection device for an oxygen generator according to claim 2, characterized in that, The reciprocating component includes a piston disc (14) slidably disposed in the piston cylinder (3), a piston rod (10) is disposed on the piston disc (14), a reciprocating plate (11) is disposed at the middle section of the piston rod (10), and a groove (1101) is provided on the side of the reciprocating plate (11) away from the piston cylinder (3).

5. The high-pressure safety protection device for an oxygen generator according to claim 4, characterized in that, The drive structure includes a rotating rod (7) rotatably mounted in the housing (1), a turntable (8) coaxially mounted on the rotating rod (7), a I-shaped part (12) slidably mounted on the turntable (8), a slide rod (1201) mounted on the I-shaped part (12), the slide rod (1201) slidably mounted in the slide groove (1101), and the I-shaped part (12) is hinged to the lifting sleeve (19) sleeved on the rotating rod (7) through a hinge rod (18).

6. The high-pressure safety protection device for an oxygen generator according to claim 5, characterized in that, The adjustment assembly includes a sleeve ring (20) rotatably connected to the lifting sleeve (19), and the sleeve ring (20) is fixedly connected to an electric telescopic rod (5) disposed in the housing (1).

7. A method for a high-pressure safety protection device for an oxygen generator, characterized in that, The high-pressure safety protection device for an oxygen generator according to claim 1 includes the following steps: Step 1: Start the motor (4). With the cooperation of the gear set (6), the rotating rod (7) drives the turntable (8) to rotate continuously in the same direction. During this process, the slide rod (1201) cooperates with the slide groove (1101) to drive the reciprocating plate (11) to drive the piston disc (14) to move back and forth, thereby delivering compressed gas to the distribution valve (13) through the first air outlet (303) and the second air outlet (304). Step 2: The distribution valve (13) distributes gas to the two sets of molecular sieves (2) through the gas pipeline (1301). During the distribution process, the pressure sensor monitors the pressure inside the molecular sieves (2) in real time. Step 3: When the pressure sensor detects that the pressure is too high, the electric telescopic rod (5) is activated, pulling the sleeve ring (20) to drive the lifting sleeve (19) to descend, so that the slide rod (1201) is close to the axis of the turntable (8), thereby shortening the movement stroke of the reciprocating plate (11), reducing the gas delivery rate of the piston cylinder (3), and preventing the pressure inside the molecular sieve (2) from continuously increasing.

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