An integrated inlet and outlet valve and pressure swing adsorption gas circuit system

Abstract

The present invention discloses an integrated inlet and outlet valve and a pressure swing adsorption gas circuit system. The integrated inlet and outlet valve includes a valve body, the valve body is provided with an air inlet, an air outlet, an exhaust port, a first inlet and reverse blowing port, and two gas path control units. The gas path control unit includes a first gas inlet and outlet and a second gas inlet and outlet. The first gas inlet and outlet is connected to the air outlet through a first one-way valve. The second gas inlet and outlet can be selectively communicated with the air inlet and the exhaust port through a first control valve. The exhaust port is provided with an on-off control mechanism. The first inlet and reverse blowing port is respectively connected to the first gas inlet and outlet of each gas path control unit through a second one-way valve. The valve body is further provided with a pressure equalization control component. The pressure swing adsorption gas circuit system includes two adsorption towers and the integrated inlet and outlet valve, and the integrated inlet and outlet valve is connected to the two inlet and outlet ends of the two adsorption towers. The present invention has the advantages of greatly reducing the connecting pipelines, being simple in installation and maintenance, having a compact structure, occupying less space, having a low manufacturing cost and a low failure rate, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air purification equipment, and particularly relates to an integrated air inlet and outlet valve and a pressure swing adsorption gas circuit system. Background Art

[0002] In the field of compressed air purification, due to its special inlet requirements, it is often necessary to have a commutation function for air inlet and discharge. For example, Figure 1 The figure shows a typical pressure swing adsorption gas circuit system adopted by existing compressed air purification treatment equipment. The working process and principle of this pressure swing adsorption gas circuit system are as follows: The first solenoid valve 1 and the fourth solenoid valve 4 cooperate with each other to form a first gas circuit loop, and the second solenoid valve 2 and the third solenoid valve 3 cooperate with each other to form a second gas circuit loop. When the first adsorption tower 100 is working, the second solenoid valve 2 and the third solenoid valve 3 are closed, and the first solenoid valve 1 and the fourth solenoid valve 4 are opened. The air source enters the first adsorption tower 100 through the first solenoid valve 1. The first adsorption tower 100 is filled with an adsorbent. Most of the purified gas enters the downstream to be supplied to the gas-using equipment, and a small part (about 16% - 20%) enters the second adsorption tower 200 through the throttle valve 5 (the gas pressure after passing through the throttle valve 5 is approximately equal to the atmospheric pressure) to backflush (or desorb, regenerate) the impurity gas trapped in the adsorbent in the previous cycle. After the backflush gas passes through the second adsorption tower 200, the tail gas is emptied through the fourth solenoid valve 4; when the second adsorption tower 200 is working, the first solenoid valve 1 and the fourth solenoid valve 4 are closed, and the second solenoid valve 2 and the third solenoid valve 3 are opened. The air source enters the second adsorption tower 200 through the second solenoid valve 2. The second adsorption tower 200 is filled with an adsorbent. Most of the purified gas enters the downstream to be supplied to the gas-using equipment, and a small part (about 16% - 20%) enters the first adsorption tower 100 through the throttle valve 5 (the gas pressure after passing through the throttle valve 5 is approximately equal to the atmospheric pressure) to backflush (or desorb, regenerate) the impurity gas trapped in the adsorbent in the previous cycle. After the backflush gas passes through the first adsorption tower 100, the tail gas is emptied through the third solenoid valve 3. The above-mentioned first gas circuit loop and the second gas circuit loop work alternately, so that the air source alternately passes through the first adsorption tower 100 and the second adsorption tower 200 for purification, and at the same time, when one adsorption tower is working, the other is passed through with backflush gas for adsorbent regeneration.

[0003] To avoid the impact of pressure mutation on the downstream gas-using equipment and to slow down the pulverization phenomenon of the adsorbent in the first adsorption tower 100 and the second adsorption tower 200 due to pressure mutation, a pressure equalization stage is added before the switching of the air inlet between the first adsorption tower 100 and the second adsorption tower 200: For example, after the adsorbent in the second adsorption tower 200 is fully regenerated, the fourth solenoid valve 4 is closed in advance, so that the pressure in the second adsorption tower 200 gradually rises from atmospheric pressure to the working pressure, and then the first solenoid valve 1 is closed, and at the same time, the second solenoid valve 2 and the third solenoid valve 3 are opened.

[0004] However, in the existing pressure swing adsorption gas circuit system, the valves are connected by pipelines. The pipeline connection is cumbersome, inconvenient for installation and maintenance, and there are many fault points. Each adsorption tower is a container with gas inlet from the bottom and outlet from the top, that is, the gas inlet end and the gas outlet end of the adsorption tower are respectively arranged at the upper and lower ends of the adsorption tower. To match this gas inlet and outlet structure and method, the gas inlet end and the gas outlet end of the dryer also need to be distributed at both ends of the adsorption tower, which will increase the overall height of the compressed air treatment equipment, resulting in a large equipment volume and much occupied space. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an integrated gas inlet and outlet valve that can greatly reduce the connecting pipelines, is simple for installation and maintenance, has a compact structure, occupies less space, has a low manufacturing cost, and a low failure rate. Correspondingly, the present invention also provides a pressure swing adsorption gas circuit system using the integrated gas inlet and outlet valve.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] An integrated gas inlet and outlet valve, comprising a valve body, the valve body is provided with a gas inlet, a gas outlet, an exhaust port, a first inlet and reverse blowing port, and two gas path control units. The gas path control unit includes a first gas inlet and outlet and a second gas inlet and outlet. The first gas inlet and outlet is connected to the gas outlet through a first one-way valve that only allows gas to flow unidirectionally from the first gas inlet and outlet to the gas outlet. The second gas inlet and outlet can be selectively communicated with the gas inlet and the exhaust port through a first control valve. The exhaust port is provided with an on-off control mechanism. The first inlet and reverse blowing port is respectively connected to the first gas inlet and outlet of each gas path control unit through a second one-way valve that only allows gas to flow unidirectionally from the first inlet and reverse blowing port to the first gas inlet and outlet. The valve body is also provided with an equalizing control assembly that can control the communication and disconnection between the gas outlet and the first inlet and reverse blowing port.

[0008] For the above integrated gas inlet and outlet valve, preferably, the first control valve includes a first valve housing, a first piston installed in the first valve housing, a first valve plate connected to the first piston, and a first driving assembly for driving the first piston to reciprocate linearly. The first valve housing is detachably installed in an inner cavity provided on the valve body and encloses a first ventilation cavity. The first ventilation cavity is provided with a first valve port communicated with the second gas inlet and outlet, a second valve port communicated with the gas inlet, and a third valve port communicated with the exhaust port. The first valve plate is located in the first ventilation cavity and can be driven by the reciprocating linearly moving first piston to selectively close the second valve port and the third valve port.

[0009] For the above integrated inlet and outlet valve, preferably, the valve body is further provided with a second inlet and reverse blowing port for being connected in parallel with the first inlet and reverse blowing port to a reverse blowing air source, the second inlet and reverse blowing port is connected to the exhaust port through a second control valve, and the second control valve is used to control the on-off of the second inlet and reverse blowing port and the exhaust port.

[0010] For the above integrated inlet and outlet valve, preferably, the second control valve includes a second valve housing, a second piston installed in the second valve housing, a second valve plate connected to the second piston, and a second driving component for driving the second piston to reciprocate linearly. The first valve housing is detachably installed in an inner cavity provided on the valve body and encloses a second ventilation cavity. The second ventilation cavity is provided with a fourth valve port, a fifth valve port, and a sixth valve port communicated with the second inlet and reverse blowing port. The third valve port is communicated with the exhaust port through the fourth valve port, the second ventilation cavity, and the fifth valve port in sequence. The second valve plate is located in the second ventilation cavity and can be driven by the reciprocating linearly moving second piston to selectively close the fourth valve port and the sixth valve port. The second control valve also serves as an on-off control mechanism for the exhaust port.

[0011] For the above integrated inlet and outlet valve, preferably, the valve body is provided with a first hole, a second hole, and a third hole extending from the outside of the valve body to the inside of the valve body. The valve body is installed with plugs for blocking the ends of the first hole, the second hole, and the third hole. The third hole communicates the first hole and the second hole. The first hole and the second hole are respectively communicated with the first ventilation cavities of two air path control units, and the communication ports of the first hole and the second hole with the first ventilation cavity serve as the third valve ports of the corresponding air path control units. The third hole is communicated with the second ventilation cavity, and the communication port of the third hole with the second ventilation cavity serves as the fourth valve port.

[0012] For the above integrated inlet and outlet valve, preferably, the valve body is provided with a first channel and a second channel that penetrate the valve body and are arranged side by side. Two sealing plates for closing the two ends of the first channel and the second channel are detachably installed on the valve body. The valve body is provided with a fourth hole and a fifth hole extending from the outside of the valve body to the inside of the valve body. The fourth hole and the fifth hole respectively serve as the first air inlets and outlets of two air path control units. The fourth hole communicates one end of the first channel and the second channel at the same time. The fifth hole communicates the other end of the first channel and the second channel at the same time. The first one-way valves of two air path control units are installed at intervals in the first channel between the fourth hole and the fifth hole, and the first channel between the first one-way valves of two air path control units serves as a first common cavity. The air outlet is communicated with the first common cavity. The second one-way valves of two air path control units are installed at intervals in the second channel between the fourth hole and the fifth hole, and the second channel between the second one-way valves of two air path control units serves as a second common cavity. The first inlet and reverse blowing port is communicated with the second common cavity.

[0013] The above integrated inlet and outlet valve, preferably, the pressure equalizing control assembly includes a ventilation passage connecting the air outlet and the first inlet and reverse blowing port, and a throttle valve located in the ventilation passage and a on-off control valve for controlling the on-off of the ventilation passage are installed on the valve body.

[0014] The above integrated inlet and outlet valve, preferably, a silencer and a drain port are provided at the exhaust port.

[0015] As a general technical concept, the present invention also provides a pressure swing adsorption gas path system, including two adsorption towers, the adsorption towers having two inlet and outlet ends, and further including the above integrated inlet and outlet valve, and the first gas inlet and outlet and the second gas inlet and outlet of the two gas path control units in the integrated inlet and outlet valve are respectively connected to the two inlet and outlet ends of the two adsorption towers.

[0016] The above pressure swing adsorption gas path system, preferably, the two inlet and outlet ends of the adsorption tower are located at the same end of the adsorption tower.

[0017] Compared with the prior art, the advantages of the present invention are as follows:

[0018] The integrated inlet and outlet valve of the present invention integrates the first one-way valve, the second one-way valve, the first control valve and the on-off control mechanism of the two gas path control units on the valve body. When used in a pressure swing adsorption system, it can greatly reduce the connecting pipelines, avoid the problem of cumbersome pipeline connection, make installation and maintenance more convenient, reduce the failure rate, have good aesthetics, and the overall size of the integrated inlet and outlet valve is small, occupying less space, which is beneficial to reducing the manufacturing cost. At the same time, the integrated inlet and outlet valve can realize the functions of air inlet, air outlet and pressure equalization, and can meet the requirements of the pressure swing adsorption gas path system.

[0019] The pressure swing adsorption gas path system of the present invention also has the advantages of the integrated inlet and outlet valve due to adopting the integrated inlet and outlet valve of the present invention. Brief Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the principle of the existing pressure swing adsorption gas path system.

[0021] Figure 2 It is a schematic diagram of the principle of the pressure swing adsorption gas path system of the present invention.

[0022] Figure 3 It is a three-dimensional structure schematic diagram of the integrated inlet and outlet valve.

[0023] Figure 4 It is a front view structure schematic diagram of the integrated inlet and outlet valve.

[0024] Figure 5 It is a right view structure schematic diagram of the integrated inlet and outlet valve.

[0025] Figure 6It is a schematic top view structure diagram of an integrated inlet and outlet valve.

[0026] Figure 7 It is Figure 6 the schematic A-A cross-sectional structure diagram in

[0027] Figure 8 It is Figure 6 the schematic B-B cross-sectional structure diagram in

[0028] Figure 9 It is Figure 6 the schematic C-C cross-sectional structure diagram in

[0029] Figure 10 It is a schematic left view structure diagram of an integrated inlet and outlet valve.

[0030] Figure 11 It is Figure 10 the schematic D-D cross-sectional structure diagram in

[0031] Legend description:

[0032] 1. Valve body; 11. Inlet port; 12. Outlet port; 13. Exhaust port; 14. First inlet and reverse purge port; 15. Second inlet and reverse purge port; 21. First gas inlet and outlet; 22. Second gas inlet and outlet; 31. First check valve; 32. Second check valve; 41. First control valve; 411. First valve housing; 412. First piston; 413. First valve plate; 414. First ventilation cavity; 415. First valve port; 416. Second valve port; 417. Third valve port; 42. Second control valve; 421. Second valve housing; 422. Second piston; 423. Second valve plate; 424. Second ventilation cavity; 425. Fourth valve port; 426. Fifth valve port; 427. Sixth valve port; 50. Sealing plate; 51. First channel; 52. Second channel; 53. First common cavity; 54. Second common cavity; 2. Throttle valve; 3. On-off control valve; 4. Silencer; 5. Drain port; 100. Adsorption tower; 101. First hole; 102. Second hole; 103. Third hole; 104. Fourth hole; 105. Fifth hole. Detailed implementation manners

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Embodiment 1:

[0035] As Figures 2 to 11As shown in the figure, the integrated intake and exhaust valve of this embodiment includes a valve body 1. The valve body 1 is provided with an air inlet 11, an air outlet 12, an exhaust port 13, a first inlet and reverse blowing port 14, and two gas path control units. The gas path control unit includes a first gas inlet and outlet 21 and a second gas inlet and outlet 22. The first gas inlet and outlet 21 is connected to the air outlet 12 through a first one-way valve 31 that only allows gas to flow unidirectionally from the first gas inlet and outlet 21 to the air outlet 12. The second gas inlet and outlet 22 can be selectively connected to the air inlet 11 and the exhaust port 13 through a first control valve 41. The exhaust port 13 is provided with an on-off control mechanism. The first inlet and reverse blowing port 14 is respectively connected to the first gas inlet and outlet 21 of each gas path control unit through a second one-way valve 32 that only allows gas to flow unidirectionally from the first inlet and reverse blowing port 14 to the first gas inlet and outlet 21. The valve body 1 is further provided with a pressure equalization control component that can control the connection and disconnection between the air outlet 12 and the first inlet and reverse blowing port 14.

[0036] This integrated intake and exhaust valve is applicable to the intake and exhaust control of a pressure swing adsorption gas path system. When in use, the first gas inlet and outlet 21 and the second gas inlet and outlet 22 of the two gas path control units are respectively connected to two adsorption towers of the pressure swing adsorption gas path system. Define the adsorption tower that needs to work as tower A, and the other adsorption tower as tower B. The gas path control unit connected to tower A is the first gas path control unit, and the gas path control unit connected to tower B is the second gas path control unit. When tower A needs to perform adsorption work, make the first control valve 41 of the first gas path control unit connect the second gas inlet and outlet 22 and the air inlet 11, and introduce the gas source from the air inlet 11. The gas will pass through tower A, the first gas inlet and outlet 21, and the first one-way valve 31 and be discharged from the air outlet 12, thus realizing the adsorption work of tower A. When tower B needs to perform regeneration work, make the first control valve 41 of the second gas path control unit connect the second gas inlet and outlet 22 and the exhaust port 13, and introduce the regeneration gas from the first inlet and reverse blowing port 14. The regeneration gas will pass through the second one-way valve 32 of the second gas path control unit, the second gas inlet and outlet 22, tower B, and the first gas inlet and outlet 21 and be discharged from the exhaust port 13, thus realizing the reverse blowing regeneration work of tower B. When pressure equalization is required after tower B is fully regenerated, make the pressure equalization control component connect the air outlet 12 and the first inlet and reverse blowing port 14. A part of the dry gas processed by tower A will pass through the pressure equalization control component to the first inlet and reverse blowing port 14, and enter tower B through the second one-way valve 32 of the second gas path control unit. At the same time, make the on-off control mechanism close the exhaust port 13 so that the gas entering tower B cannot be discharged until the pressure in tower B rises to the working pressure, and then the subsequent state of switching to tower B for work can be carried out.

[0037] The integrated inlet and outlet valve integrates the first one-way valve 31, the second one-way valve 32, the first control valve 41 and the on-off control mechanism of two gas path control units on the valve body 1. When used in a pressure swing adsorption system, it can greatly reduce the connecting pipelines, avoid the problem of cumbersome pipeline connection, make installation and maintenance more convenient, reduce the failure rate, have good aesthetics, and the overall size of the integrated inlet and outlet valve is small, occupying less space, which is beneficial to reducing the manufacturing cost. At the same time, the integrated inlet and outlet valve can realize the functions of air intake, air outlet and pressure equalization, and can meet the requirements of the pressure swing adsorption gas path system.

[0038] In this embodiment, the first control valve 41 includes a first valve housing 411, a first piston 412 installed in the first valve housing 411, a first valve plate 413 connected to the first piston 412, and a first driving assembly for driving the first piston 412 to reciprocate linearly. The first valve housing 411 is detachably installed in the inner cavity provided on the valve body 1 and encloses a first ventilation cavity 414. The first ventilation cavity 414 is provided with a first valve port 415 communicating with the second gas inlet and outlet 22, a second valve port 416 communicating with the air inlet 11, and a third valve port 417 communicating with the exhaust port 13. The first valve plate 413 is located in the first ventilation cavity 414 and can be driven by the reciprocating linear motion of the first piston 412 to selectively close the second valve port 416 and the third valve port 417. The first control valve 41 is installed in the inner cavity provided on the valve body 1 in a detachable manner. The first control valve 41 can be separately manufactured and assembled and then installed on the valve body 1, and the manufacturing and assembly are very simple. Moreover, the first control valve 41 is installed in the inner cavity provided on the valve body 1, which is beneficial to improving the structural compactness. The above first driving assembly can adopt the form of a gas source driving the first piston 412 to move unidirectionally and a spring driving the first piston 412 to return, or other existing methods such as a cylinder directly driving the first piston 412 to reciprocate linearly.

[0039] In this embodiment, the valve body 1 is further provided with a second inlet and backwashing air port 15 which is connected in parallel with the first inlet and backwashing air port 14 to the backwashing air source. The second inlet and backwashing air port 15 is connected to the exhaust port 13 through a second control valve 42. The second control valve 42 is used to control the on-off of the second inlet and backwashing air port 15 and the exhaust port 13. The second inlet and backwashing air port 15 and the first inlet and backwashing air port 14 are connected in parallel to the backwashing air source and communicate with each other. During backwashing regeneration, the second control valve 42 can disconnect the second inlet and backwashing air port 15 and the exhaust port 13 to ensure that the gas from the backwashing air source only enters the first inlet and backwashing air port 14. During pressure equalization, the second control valve 42 can connect the second inlet and backwashing air port 15 and the exhaust port 13 to allow the gas from the backwashing air source to be discharged from the exhaust port 13. Since the backwashing air source usually comes from the tail gas of the oxygen generator, which is nitrogen-rich gas, and this gas is the regeneration gas of the oxygen generator and needs to be discharged in time. If the nitrogen-rich gas is not discharged in time, it may cause incomplete regeneration of the oxygen generator and result in consequences such as reduced oxygen concentration. Therefore, this solution can enable the pressure swing adsorption gas circuit system to equalize pressure without affecting the discharge of external nitrogen-rich gas.

[0040] In this embodiment, the second control valve 42 includes a second valve housing 421, a second piston 422 installed in the second valve housing 421, a second valve plate 423 connected to the second piston 422, and a second driving assembly for driving the second piston 422 to reciprocate linearly. The first valve housing 411 is detachably installed in the inner cavity provided on the valve body 1 and encloses a second ventilation cavity 424. The second ventilation cavity 424 is provided with a fourth valve port 425, a fifth valve port 426, and a sixth valve port 427 communicating with the second inlet and reverse blowing port 15. The third valve port 417 is communicated with the exhaust port 13 through the fourth valve port 425, the second ventilation cavity 424, and the fifth valve port 426 in sequence. The second valve plate 423 is located in the second ventilation cavity 424 and can be driven by the reciprocating linear motion of the second piston 422 to selectively close the fourth valve port 425 and the sixth valve port 427. The second control valve 42 also serves as the on-off control mechanism for the exhaust port 13. The second control valve 42 is detachably installed in the inner cavity provided on the valve body 1. The second control valve 42 can be separately manufactured, assembled, and then installed on the valve body 1, which is very simple in manufacturing and assembly. Moreover, the second control valve 42 is installed in the inner cavity provided on the valve body 1, which is beneficial to improving the structural compactness. The above-mentioned second driving assembly can adopt the form of a gas source driving the second piston 422 to move unidirectionally and a spring driving the second piston 422 to reset, or other existing methods such as a cylinder directly driving the second piston 422 to reciprocate linearly. The above-mentioned second control valve 42 can selectively close the fourth valve port 425 and the sixth valve port 427. When the fourth valve port 425 is closed, the exhaust port 13 is disconnected from the third valve port 417, thereby preventing the gas from being discharged during the pressure equalization of the adsorption tower. At the same time, the exhaust port 13 is communicated with the second inlet and reverse blowing port 15. When the sixth valve port 427 is closed, the exhaust port 13 is communicated with the third valve port 417, so that the gas can be discharged during the regeneration of the adsorption tower. At the same time, the exhaust port 13 is disconnected from the second inlet and reverse blowing port 15. Thus, it can be seen that the second control valve 42 takes into account the functions of controlling the on-off of the second inlet and reverse blowing port 15 and the exhaust port 13, and the on-off of the exhaust port 13, while meeting the process sequence requirements, which can save the number of valves or control mechanisms, improve the structural simplicity and compactness, and reduce the cost.

[0041] In this embodiment, the valve body 1 is provided with a first hole 101, a second hole 102 and a third hole 103 extending from the outside of the valve body 1 to the inside of the valve body 1. A plug for blocking the ends of the first hole 101, the second hole 102 and the third hole 103 is installed on the valve body 1. The third hole 103 communicates with the first hole 101 and the second hole 102. The first hole 101 and the second hole 102 respectively communicate with the first ventilation cavities 414 of two air path control units, and the communication ports of the first hole 101 and the second hole 102 with the first ventilation cavity 414 serve as the third valve ports 417 of the corresponding air path control units. The third hole 103 communicates with the second ventilation cavity 424, and the communication port of the third hole 103 with the second ventilation cavity 424 serves as the fourth valve port 425. This installation structure is convenient for manufacturing and assembling.

[0042] In this embodiment, the valve body 1 is provided with a first channel 51 and a second channel 52 that penetrate the valve body 1 and are arranged side by side. Two sealing plates 50 for closing the two ends of the first channel 51 and the second channel 52 are detachably installed on the valve body 1. The valve body 1 is provided with a fourth hole 104 and a fifth hole 105 extending from the outside of the valve body 1 to the inside of the valve body 1. The fourth hole 104 and the fifth hole 105 respectively serve as the first air inlets and outlets 21 of two air path control units. The fourth hole 104 simultaneously communicates with one end of the first channel 51 and the second channel 52, and the fifth hole 105 simultaneously communicates with the other end of the first channel 51 and the second channel 52. The first one-way valves 31 of the two air path control units are spaced and installed in the first channel 51 between the fourth hole 104 and the fifth hole 105, and the first channel 51 between the first one-way valves 31 of the two air path control units serves as the first common cavity 53. The air outlet 12 communicates with the first common cavity 53. The second one-way valves 32 of the two air path control units are spaced and installed in the second channel 52 between the fourth hole 104 and the fifth hole 105, and the second channel 52 between the second one-way valves 32 of the two air path control units serves as the second common cavity 54. The first inlet and reverse blowing port 14 communicates with the second common cavity 54. This installation structure is convenient for manufacturing and assembling, and forms a first common cavity 53 that connects the first one-way valves 31 of the two air path control units and the air outlet 12, and a second common cavity 54 that connects the second one-way valves 32 of the two air path control units and the first inlet and reverse blowing port 14, simplifies the air path, reduces the complexity of the air path, and is beneficial to improving the structural simplicity and compactness of the integrated air inlet and outlet valve. The above-mentioned sealing plates 50 are preferably installed on the valve body 1 by screws, and a sealing ring is provided between the sealing plates 50 and the valve body 1 to ensure the sealing performance.

[0043] In this embodiment, the pressure equalizing control assembly includes a ventilation passage connecting the air outlet 12 and the first inlet and reverse blowing air outlet 14. A throttle valve 2 located in the ventilation passage and an on-off control valve 3 for controlling the on-off of the ventilation passage are installed on the valve body 1. The on-off control valve 3 can control the connection and disconnection of the ventilation passage, and thus select whether to pass the gas that has passed through the adsorption tower and reaches the air outlet 12 to the first inlet and reverse blowing air outlet 14 for pressure equalization. The throttle valve 2 is used to control the pressure and flow rate of the gas.

[0044] Preferably, a fourth hole 104 extending from the outside to the inside of the valve body 1 is provided on the valve body 1, and a plug for blocking the end of the fourth hole 104 is installed on the valve body 1. The fourth hole 104 serves as the first inlet and reverse blowing air outlet 14. A fifth hole 105 extending from the outside to the inside of the valve body 1 is provided on the valve body 1. The throttle valve 2 and the on-off control valve 3 are installed in the fifth hole 105, and the on-off control valve 3 also blocks the end of the fifth hole 105. The fifth hole 105 communicates with the first ventilation cavity 414 and the fourth hole 104. Using this structure to form the ventilation passage and the installation of the throttle valve 2 and the on-off control valve 3 not only simplifies the manufacturing and assembly, but also makes the overall structure of the integrated inlet and outlet valve simple and compact.

[0045] In this embodiment, a silencer 4 and a drain port 5 are provided at the exhaust port 13. Among them, the silencer 4 can reduce the noise during gas emission, and the drain port 5 can discharge the liquid water separated out by the pressure swing adsorption gas path system.

[0046] Embodiment 2:

[0047] Figure 2 The pressure swing adsorption gas path system of this embodiment is also shown, which includes two adsorption towers 100. The adsorption tower 100 has two inlet and outlet ends, and also includes the integrated inlet and outlet valve of Embodiment 1. The first gas inlet and outlet 21 and the second gas inlet and outlet 22 of the two gas path control units in the integrated inlet and outlet valve are respectively connected to the two inlet and outlet ends of the two adsorption towers 100.

[0048] Since the pressure swing adsorption gas path system adopts the integrated inlet and outlet valve of Embodiment 1, it also has the advantages of this integrated inlet and outlet valve.

[0049] In this embodiment, the two inlet and outlet ends of the adsorption tower 100 are located at the same end of the adsorption tower 100. This is beneficial to reducing the overall size and volume of the equipment and reducing the occupied space.

[0050] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art of this technology, the improvements and transformations obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An integrated intake and exhaust valve, characterized in that: It includes a valve body (1), the valve body (1) is provided with an air inlet (11), an air outlet (12), an exhaust port (13), a first inlet and reverse blowing port (14) and two gas path control units. The gas path control unit includes a first gas inlet and outlet (21) and a second gas inlet and outlet (22). The first gas inlet and outlet (21) is connected to the air outlet (12) through a first one-way valve (31) that only allows gas to flow unidirectionally from the first gas inlet and outlet (21) to the air outlet (12). The second gas inlet and outlet (22) is selectively connected to the air inlet (11) and the exhaust port (13) through a first control valve (41). The exhaust port (13) is provided with an on-off control mechanism. The first inlet and reverse blowing port (14) is respectively connected to the first gas inlet and outlet (21) of each gas path control unit through a second one-way valve (32) that only allows gas to flow unidirectionally from the first inlet and reverse blowing port (14) to the first gas inlet and outlet (21). The valve body (1) is further provided with a pressure equalizing control component that can control the connection and disconnection between the air outlet (12) and the first inlet and reverse blowing port (14).

2. The integrated intake and exhaust valve according to claim 1, characterized in that: The first control valve (41) includes a first valve housing (411), a first piston (412) installed in the first valve housing (411), a first valve plate (413) connected to the first piston (412), and a first driving component for driving the first piston (412) to reciprocate linearly. The first valve housing (411) is detachably installed in an inner cavity provided on the valve body (1) and encloses a first ventilation cavity (414). The first ventilation cavity (414) is provided with a first valve port (415) communicating with the second gas inlet and outlet (22), a second valve port (416) communicating with the air inlet (11), and a third valve port (417) communicating with the exhaust port (13). The first valve plate (413) is located in the first ventilation cavity (414) and can be driven by the reciprocating linear motion of the first piston (412) to selectively close the second valve port (416) and the third valve port (417).

3. The integrated intake and exhaust valve according to claim 2, characterized in that: The valve body (1) is further provided with a second inlet and reverse blowing port (15) for being connected in parallel with the first inlet and reverse blowing port (14) to an anti-blowing air source. The second inlet and reverse blowing port (15) is connected to the exhaust port (13) through a second control valve (42). The second control valve (42) is used to control the on-off between the second inlet and reverse blowing port (15) and the exhaust port (13).

4. The integrated intake and exhaust valve according to claim 3, characterized in that: The second control valve (42) includes a second valve housing (421), a second piston (422) installed in the second valve housing (421), a second valve plate (423) connected to the second piston (422), and a second driving assembly for driving the second piston (422) to reciprocate linearly. The first valve housing (411) is detachably installed in an inner cavity provided on the valve body (1) and encloses a second ventilation cavity (424). The second ventilation cavity (424) is provided with a fourth valve port (425), a fifth valve port (426), and a sixth valve port (427) communicating with the second inlet and back-blowing port (15). The third valve port (417) is communicated with the exhaust port (13) through the fourth valve port (425), the second ventilation cavity (424), and the fifth valve port (426) in sequence. The second valve plate (423) is located in the second ventilation cavity (424) and can be driven by the second piston (422) reciprocating linearly to selectively close the fourth valve port (425) and the sixth valve port (427). The second control valve (42) also serves as an on-off control mechanism for the exhaust port (13).

5. The integrated inlet and outlet valve according to claim 4, wherein: The valve body (1) is provided with a first hole (101), a second hole (102), and a third hole (103) extending from the outside of the valve body (1) to the inside of the valve body (1). The valve body (1) is installed with plugs for blocking the ends of the first hole (101), the second hole (102), and the third hole (103). The third hole (103) communicates the first hole (101) and the second hole (102). The first hole (101) and the second hole (102) are respectively communicated with the first ventilation cavities (414) of two gas path control units, and the communication ports of the first hole (101) and the second hole (102) with the first ventilation cavities (414) serve as the third valve ports (417) of the corresponding gas path control units. The third hole (103) is communicated with the second ventilation cavity (424), and the communication port of the third hole (103) with the second ventilation cavity (424) serves as the fourth valve port (425).

6. The integrated inlet and outlet valve according to claim 1, wherein: The valve body (1) is provided with a first channel (51) and a second channel (52) that penetrate through the valve body (1) and are arranged side by side. Two sealing plates (50) that detachably mount on the valve body (1) and close both ends of the first channel (51) and the second channel (52) are provided. The valve body (1) is provided with a fourth hole (104) and a fifth hole (105) that extend from the outside of the valve body (1) to the inside of the valve body (1). The fourth hole (104) and the fifth hole (105) serve as the first gas inlets and outlets (21) of two gas path control units respectively. The fourth hole (104) communicates with one end of both the first channel (51) and the second channel (52) simultaneously. The fifth hole (105) communicates with the other end of both the first channel (51) and the second channel (52) simultaneously. The first one-way valves (31) of the two gas path control units are spaced and installed in the first channel (51) between the fourth hole (104) and the fifth hole (105), and the first channel (51) between the first one-way valves (31) of the two gas path control units serves as a first common chamber (53). The air outlet (12) communicates with the first common chamber (53). The second one-way valves (32) of the two gas path control units are spaced and installed in the second channel (52) between the fourth hole (104) and the fifth hole (105), and the second channel (52) between the second one-way valves (32) of the two gas path control units serves as a second common chamber (54). The first inlet and reverse blowing port (14) communicates with the second common chamber (54).

7. The integrated air inlet and outlet valve according to claim 1, characterized in that: The pressure equalizing control assembly includes a ventilation channel connecting the air outlet (12) and the first inlet and reverse blowing port (14). A throttle valve (2) located in the ventilation channel and a on-off control valve (3) for controlling the on-off of the ventilation channel are installed on the valve body (1).

8. The integrated air inlet and outlet valve according to claim 1, characterized in that: The exhaust port (13) is provided with a muffler (4) and a drain port (5).

9. A pressure swing adsorption gas path system includes two adsorption towers (100). The adsorption tower (100) has two air inlet and outlet ends, characterized in that: It further includes the integrated air inlet and outlet valve according to any one of claims 1 to 8. The first gas inlets and outlets (21) and the second gas inlets and outlets (22) of the two gas path control units in the integrated air inlet and outlet valve are respectively connected to the two air inlet and outlet ends of the two adsorption towers (100).

10. The pressure swing adsorption gas path system according to claim 9, characterized in that: The two air inlet and outlet ends of the adsorption tower (100) are located at the same end of the adsorption tower (100).

Images