Integrated control valve for pressure swing adsorption gas system

Abstract

The present invention discloses an integrated control valve for a pressure swing adsorption gas path system, comprising a valve body with concave cavities at both ends, a valve sleeve is detachably installed in each concave cavity to form a ventilation cavity located at the bottom of the concave cavity, the ventilation cavities at both ends of the valve body are connected through a connecting hole, the connecting port of each ventilation cavity and the connecting hole is a first valve port, a connecting channel connected to the ventilation cavity is provided on the valve sleeve, the connecting port of the connecting channel and the ventilation cavity is a second valve port, the valve body is provided with an air inlet connected to the connecting hole, each ventilation cavity is connected to an air inlet and outlet connected to the outside of the valve body, each connecting channel is connected to an exhaust hole connected to the outside of the valve body, a driving mechanism is installed in each valve sleeve, and the driving mechanism is connected to a valve sheet located in the ventilation cavity that can selectively cover and close the first valve port and the second valve port. The present invention has the advantages of low cleanliness requirements for the gas source, stable and reliable operation, low failure rate, simple and compact structure, easy manufacture and installation, simple maintenance, low cost, etc.

Description

Technical Field

[0001] The invention relates to the technical field of compressed air purification equipment, and in particular to an integrated control valve for a pressure swing adsorption gas path system. Background Art

[0002] In the field of compressed air purification, due to its special air intake requirements, it is often necessary for the air intake and exhaust to have a reversing function. For example, Figure 1 The figure shows a typical pressure swing adsorption gas circuit system used in existing compressed space purification and treatment equipment. The working process and principle of the 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, 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, the first solenoid valve 1 and the fourth solenoid valve 4 are opened, and the gas source enters the first adsorption tower 100 through the first solenoid valve 1. The first adsorption tower 100 is filled with adsorbent. Most of the purified gas enters the downstream and is provided to the gas-using equipment, and a small part (about 16% to 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) for backblowing (or When the second adsorption tower 200 is working, the first solenoid valve 1 and the fourth solenoid valve 4 are closed, the second solenoid valve 2 and the third solenoid valve 3 are opened, and the gas source enters the second adsorption tower 200 through the second solenoid valve 2. The second adsorption tower 200 is filled with adsorbent. Most of the purified gas enters the downstream and is provided to the gas-using equipment. A small part (about 16% to 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 back-blow (or analyze, regenerate) the impurity gas trapped in the adsorbent in the previous cycle. After the back-blow gas passes through the first adsorption tower 100, the tail gas is emptied through the third solenoid valve 3. The first gas circuit and the second gas circuit work alternately, so that the gas source alternately passes through the first adsorption tower 100 and the second adsorption tower 200 for purification. At the same time, when one adsorption tower is working, the other adsorption tower is fed with back-blow gas to regenerate the adsorbent.

[0003] In the existing pressure swing adsorption gas circuit system, each valve is connected by a pipeline. The pipeline connection is cumbersome, inconvenient to install and maintain, and there are many fault points. The number of solenoid valves is also large, and the cost is high. In addition, each adsorption tower is a container with bottom inlet and top outlet, that is, the air inlet and outlet of the adsorption tower are respectively arranged at the two ends of the adsorption tower. In order to match this air inlet and outlet structure and method, the air inlet and outlet of the dryer also need to be distributed at the two ends of the adsorption tower, which will increase the overall height of the compressed air treatment equipment, resulting in a large equipment volume and occupying a lot of space.

[0004] from Figure 1 From the gas circuit principle of the pressure swing adsorption gas circuit system shown in the figure, it can be found that the inlet and outlet gas control gas circuit can be simplified to a two-position five-way solenoid valve structure, such as Figure 2 The double-control two-position five-way valve shown in the figure has port 1 as the air inlet, ports 2 and 4 are connected to the first adsorption tower 100 and the second adsorption tower 200 respectively, and ports 3 and 5 are directly emptied. At present, some manufacturers directly use this two-position five-way valve as the air inlet and outlet control valve. Although this solution is low-cost, the biggest problem is that the valve core of the existing two-position five-way solenoid valve is a sliding valve structure, which has relatively high requirements for the air source (i.e., the cleanliness of the gas entering port 1 is relatively high), so it is generally only suitable for installation in a control loop with a relatively clean air source. As the air inlet source of the pressure swing adsorption gas circuit system has relatively many impurities (including oil, water and dust, etc.), if the standard two-position five-way solenoid valve is directly used in the main gas circuit, it is very easy to cause valve core jamming and other phenomena, with a high failure rate and a short service life. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an integrated control valve for a pressure swing adsorption gas system which has low requirements on the cleanliness of the gas source, stable and reliable operation, low failure rate, simple and compact structure, easy manufacture and installation, simple maintenance, and low cost.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] An integrated control valve for a pressure swing adsorption gas path system comprises a valve body with concave cavities at both ends, each concave cavity is detachably installed with a valve sleeve to form a ventilation cavity located at the bottom of the concave cavity, the ventilation cavities at both ends of the valve body are connected through a connecting hole, the connecting port of each ventilation cavity and the connecting hole is a first valve port, the valve sleeve is provided with a connecting channel connected to the ventilation cavity, the connecting port of the connecting channel and the ventilation cavity is a second valve port, the valve body is provided with an air inlet connected to the connecting hole, each ventilation cavity is connected with an air inlet and outlet connected to the outside of the valve body, each connecting channel is connected with an exhaust hole connected to the outside of the valve body, a driving mechanism is installed in each valve sleeve, the driving mechanism is connected with a valve sheet located in the ventilation cavity and driven by the driving mechanism to selectively cover and close the first valve port and the second valve port.

[0008] As a further improvement of the above technical solution:

[0009] The driving mechanism includes a piston and a countersunk hole provided on the valve sleeve, the piston is installed in the countersunk hole from the open end of the countersunk hole and slides linearly with the countersunk hole, the piston and the bottom of the countersunk hole form a first inner cavity, the valve body or the valve sleeve is detachably mounted with an end plate for sealing the open end of the countersunk hole, the countersunk hole between the piston and the end plate is a second inner cavity, the end plate is provided with a gas inlet and outlet hole for gas to enter and exit the second inner cavity, the connecting channel is composed of a ventilation cavity, a first through hole connecting the first inner cavity and the ventilation cavity, and a second through hole connecting the first inner cavity and the exhaust hole, the valve plate is connected to the piston by a detachable connecting mechanism passing through the first through hole, and the piston is connected with an elastic mechanism for forcing the piston to move away from the first through hole.

[0010] The detachable connection mechanism comprises a connection portion arranged on the valve plate and a connection hole arranged on the piston, and the connection portion is inserted into the connection hole.

[0011] The piston has a connecting rod portion extending toward the ventilation cavity, the connecting hole is arranged on the connecting rod portion, and the range of linear sliding of the piston in the counterbore enables the extended end of the connecting rod portion to extend into and out of the ventilation cavity.

[0012] The elastic mechanism comprises a spring, the spring is sleeved on the outside of the connecting rod, and two ends of the spring are respectively connected to the piston and the bottom surface of the countersunk hole.

[0013] The valve sleeve is provided with two sealing rings for sealing the gap between the valve sleeve and the concave cavity. The two sealing rings are arranged at intervals along the depth direction of the concave cavity. The second through hole is located between the two sealing rings. The exhaust hole is connected to the gap between the valve sleeve and the concave cavity between the two sealing rings.

[0014] The opening end of the cavity is provided with a positioning sink, the valve sleeve is provided with a positioning boss abutting against the positioning sink, and the end plate is connected to the valve body through a fastener and presses the positioning boss onto the positioning sink.

[0015] The connecting hole is a straight hole connecting the bottom surfaces of the two concave cavities.

[0016] The air inlet and all the air outlets are arranged on one side of the valve body, and all the air inlet and outlet holes are located on the other side of the valve body.

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

[0018] The integrated control valve for the pressure swing adsorption gas path system of the present invention integrates various control mechanisms and channels on the valve body. When used in the pressure swing adsorption system, it can greatly reduce the connection pipelines, avoid the problem of redundant pipeline connections, make installation and maintenance easier, reduce the failure rate, and have good aesthetics. The overall size of the integrated control valve is small, and it occupies less space, which is conducive to reducing manufacturing costs. At the same time, the valve plate adopts a fitting and covering method to close the first valve port or the second valve port, which has good sealing performance, low requirements on the precision of parts and assembly precision, low requirements on the cleanliness of the gas source, and stable and reliable operation with low failure rate. The integrated control valve also has the advantages of simple and compact structure, easy manufacture and assembly, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The schematic diagram of an existing pressure swing adsorption gas circuit system using multiple solenoid valves.

[0020] Figure 2 The schematic diagram of the existing pressure swing adsorption gas circuit system using a double-controlled two-position five-way valve is shown in FIG.

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the integrated control valve used in the pressure swing adsorption gas system.

[0022] Figure 4 It is a schematic diagram of the main structure of an integrated control valve used in a pressure swing adsorption gas system.

[0023] Figure 5 for Figure 4 Schematic diagram of the AA cross-sectional structure.

[0024] Legend:

[0025] 1. Valve body; 11. Concave cavity; 111. Positioning sink; 13. Connecting hole; 14. Air inlet; 15. Air inlet and outlet holes; 16. Air exhaust hole; 2. Valve sleeve; 21. Connecting passage; 211. First through hole; 212. Second through hole; 22. Sink; 23. First inner cavity; 24. Second inner cavity; 26. Positioning boss; 3. Ventilation cavity; 4. Valve plate; 41. Connecting part; 5. Piston; 51. Connecting hole; 52. Connecting rod; 6. End plate; 61. Gas inlet and outlet holes; 7. Spring; 8. Sealing ring; 101. First valve port; 102. Second valve port. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 3 to 5As shown, the integrated control valve for the pressure swing adsorption gas path system of this embodiment includes a valve body 1 with concave cavities 11 at both ends, a valve sleeve 2 is detachably installed in each concave cavity 11 to surround a ventilation cavity 3 located at the bottom of the concave cavity 11, the ventilation cavities 3 at both ends of the valve body 1 are connected through a connecting hole 13, and the connecting port of each ventilation cavity 3 and the connecting hole 13 is a first valve port 101, a connecting channel 21 connected to the ventilation cavity 3 is provided on the valve sleeve 2, and the connecting port of the connecting channel 21 and the ventilation cavity 3 is a second valve port 102, the valve body 1 is provided with an air inlet 14 connected to the connecting hole 13, each ventilation cavity 3 is connected to an air inlet and outlet 15 connected to the outside of the valve body 1, and each connecting channel 21 is connected to an exhaust pore 16 connected to the outside of the valve body 1, and a driving mechanism is installed in each valve sleeve 2, and the driving mechanism is connected to a valve plate 4 located in the ventilation cavity 3 and driven by the driving mechanism to selectively cover and close the first valve port 101 and the second valve port 102.

[0028] The integrated control valve for a pressure swing adsorption gas circuit system is suitable for the intake and exhaust control of the pressure swing adsorption gas circuit system. When in use, the two inlet and outlet air holes 15 are respectively connected to the two adsorption towers of the pressure swing adsorption gas circuit system. The adsorption tower that needs to work is defined as adsorption tower A, and the other adsorption tower is defined as adsorption tower B. The unit composed of the valve sleeve 2, ventilation cavity 3, driving mechanism and valve plate 4 corresponding to the inlet and outlet air holes 15 connected to the adsorption tower A is the first control unit, and the unit composed of the valve sleeve 2, ventilation cavity 3, driving mechanism and valve plate 4 corresponding to the inlet and outlet air holes 15 connected to the adsorption tower B is the second control unit. When adsorption tower A is required to perform adsorption work, the driving mechanism of the first control unit drives the valve plate 4 to close the second valve port 102 and open the first valve port 101; the driving mechanism of the second control unit drives the valve plate 4 to open the second valve port 102 and close the first valve port 101; gas is introduced from the air inlet 14, and the gas enters the connecting hole 13, and enters the adsorption tower A through the first valve port 101, the ventilation cavity 3, and the inlet and outlet holes 15 of the first control unit in sequence; after being treated by the adsorption tower A, the gas is discharged from the exhaust gas path of the pressure swing adsorption gas path system and supplied to the downstream gas-using equipment; during the adsorption work of the adsorption tower A, when the adsorption tower B needs to perform back-flushing work, the gas treated by the adsorption tower A is introduced into the adsorption tower B through the throttle valve part of the exhaust gas path of the pressure swing adsorption gas path system, and then is discharged through the inlet and outlet holes 15, the ventilation cavity 3, the second valve port 102 and the exhaust hole 16 of the second control unit in sequence.

[0029] The integrated control valve integrates various control mechanisms and channels on the valve body 1. When used in a pressure swing adsorption system, it can greatly reduce the number of connecting pipelines, avoid the problem of redundant pipeline connections, make installation and maintenance easier, reduce the failure rate, and have good aesthetics. The overall size of the integrated control valve is small, and it occupies less space, which is conducive to reducing manufacturing costs. At the same time, the valve plate 4 uses a fitting covering method to close the first valve port 101 or the second valve port 102, which has good sealing performance, low requirements on the precision of parts and assembly precision, and low requirements on the cleanliness of the gas source. It works stably and reliably with a low failure rate. The integrated control valve also has the advantages of simple and compact structure, easy manufacture and assembly, and low cost.

[0030] In this embodiment, the driving mechanism includes a piston 5 and a countersunk hole 22 provided on the valve sleeve 2. The piston 5 is installed into the countersunk hole 22 from the open end of the countersunk hole 22 and slides linearly with the countersunk hole 22. The piston 5 and the bottom of the countersunk hole 22 form a first inner cavity 23. The valve body 1 or the valve sleeve 2 is detachably mounted with an end plate 6 that seals the open end of the countersunk hole 22. The countersunk hole 22 between the piston 5 and the end plate 6 is a second inner cavity 24. The end plate 6 is provided with a gas inlet and outlet hole 61 for gas to enter and exit the second inner cavity 24. The connecting channel 21 is composed of a ventilation cavity 3, a first through hole 211 connecting the first inner cavity 23 and the ventilation cavity 3, and a second through hole 212 connecting the first inner cavity 23 and the exhaust hole 16. The valve plate 4 is connected to the piston 5 by a detachable connecting mechanism passing through the first through hole 211. The piston 5 is connected with an elastic mechanism for forcing the piston 5 to move away from the first through hole 211. The piston 5 can be driven to move close to the first through hole 211 by passing the driving gas source into the second inner cavity 24 through the gas inlet and outlet hole 61. When the second inner cavity 24 is not fed with the gas source, the piston 5 will move away from the first through hole 211 under the action of the elastic mechanism, thereby realizing the control of the reciprocating motion of the piston 5. The driving mechanism has a simple and compact structure, is easy to manufacture and assemble, and works stably and reliably.

[0031] In this embodiment, the detachable connection mechanism includes a connection portion 41 provided on the valve plate 4 and a connection hole 51 provided on the piston 5, and the connection portion 41 is inserted into the connection hole 51. The connection portion 41 can reciprocate in the connection hole 51, thereby realizing the movement of the valve plate 4 relative to the piston 5. The connection and disassembly of the valve plate 4 and the piston 5 can be completed by a simple plug-in operation. This kind of movable connection mechanism has the advantages of simple and compact structure, low cost, and easy manufacturing and assembly.

[0032] In this embodiment, the piston 5 has a connecting rod portion 52 extending toward the ventilation chamber 3, and the connecting hole 51 is provided on the connecting rod portion 52. The piston 5 slides linearly in the counterbore 22 within a range such that the extended end of the connecting rod portion 52 can extend into and out of the ventilation chamber 3. The piston 5 is provided with the connecting rod portion 52 and is connected in coordination with the connecting portion 41, which can increase the length of the connecting hole 51, so that the connecting portion 41 and the connecting hole 51 have a longer coordination length, which is beneficial to improving the movement stability of the valve plate 4, and at the same time, the connecting rod portion 52 plays a role in pushing the valve plate 4 to move.

[0033] In this embodiment, the elastic mechanism includes a spring 7, which is sleeved outside the connecting rod 52, and the two ends of the spring 7 are respectively connected to the piston 5 and the bottom surface of the counterbore 22. This elastic mechanism has a simple structure, low cost, easy manufacture and assembly, and stable and reliable operation.

[0034] In this embodiment, two sealing rings 8 are installed on the valve sleeve 2 to seal the gap between the valve sleeve 2 and the concave cavity 11. The two sealing rings 8 are arranged at intervals along the depth direction of the concave cavity 11. The second through hole 212 is located between the two sealing rings 8, and the exhaust hole 16 is connected to the gap between the valve sleeve 2 and the concave cavity 11 between the two sealing rings 8. This assembly structure and method has the advantages of good sealing performance and easy manufacturing and assembly.

[0035] In this embodiment, the opening end of the cavity 11 is provided with a positioning sink 111, the valve sleeve 2 is provided with a positioning boss 26 that abuts against the positioning sink 111, and the end plate 6 is connected to the valve body 1 through a fastener and presses the positioning boss 26 onto the positioning sink 111. Not only is the valve sleeve 2 easy to install, but it also has a simple and compact structure and good installation stability.

[0036] In this embodiment, the connecting hole 13 is a straight hole connecting the bottom surfaces of the two concave cavities 11, and is easy to process and manufacture.

[0037] In this embodiment, the air inlet 14 and all the air outlets 16 are arranged on one side of the valve body 1, and all the air inlet and outlet holes 15 are arranged on the other side of the valve body 1. This facilitates processing and manufacturing, helps to reduce the size of the valve body 1, and ensures the structural strength of the valve body 1.

[0038] The above is only a 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, improvements and changes 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 control valve for a pressure swing adsorption gas circuit system, characterized in that: The invention comprises a valve body (1) having concave cavities (11) at both ends, a valve sleeve (2) being detachably mounted in each concave cavity (11) to form a vent cavity (3) located at the bottom of the concave cavity (11), the vent cavities (3) at both ends of the valve body (1) being connected via a connecting hole (13), the connecting opening between each vent cavity (3) and the connecting hole (13) being a first valve opening (101), the valve sleeve (2) being provided with a connecting channel (21) connected to the vent cavity (3), the connecting opening between the connecting channel (21) and the vent cavity (3) being The valve body (1) is provided with an air inlet hole (14) connected to the communication hole (13), each vent cavity (3) is connected to an air inlet and outlet hole (15) connected to the outside of the valve body (1), each communication channel (21) is connected to an air exhaust hole (16) connected to the outside of the valve body (1), and each valve sleeve (2) is installed with a driving mechanism, the driving mechanism is connected to a valve plate (4) located in the vent cavity (3) and driven by the driving mechanism to selectively cover and close the first valve port (101) and the second valve port (102); The driving mechanism comprises a piston (5) and a countersunk hole (22) provided on the valve sleeve (2); the piston (5) is inserted into the countersunk hole (22) from the open end of the countersunk hole (22) and linearly slides with the countersunk hole (22); the piston (5) and the bottom of the countersunk hole (22) form a first inner cavity (23); an end plate (6) for sealing the open end of the countersunk hole (22) is detachably mounted on the valve body (1) or the valve sleeve (2); the countersunk hole (22) between the piston (5) and the end plate (6) is a second inner cavity (24); and the end plate (6) is provided with a There is a gas inlet and outlet hole (61) for gas to enter and exit the second inner cavity (24); the connecting channel (21) is composed of a ventilation cavity (3), a first through hole (211) connecting the first inner cavity (23) and the ventilation cavity (3), and a second through hole (212) connecting the first inner cavity (23) and the exhaust hole (16); the valve plate (4) is connected to the piston (5) via a detachable connecting mechanism passing through the first through hole (211); and the piston (5) is connected to an elastic mechanism for forcing the piston (5) to move away from the first through hole (211).

2. The integrated control valve for a pressure swing adsorption gas circuit system according to claim 1, characterized in that: The detachable connection mechanism comprises a connection portion (41) provided on the valve plate (4) and a connection hole (51) provided on the piston (5), wherein the connection portion (41) is inserted into the connection hole (51).

3. The integrated control valve for a pressure swing adsorption gas circuit system according to claim 2, characterized in that: The piston (5) has a connecting rod portion (52) extending toward the ventilation chamber (3); the connecting hole (51) is provided on the connecting rod portion (52); and the piston (5) slides linearly in the counterbore (22) within a range such that the extended end of the connecting rod portion (52) can extend into and out of the ventilation chamber (3).

4. The integrated control valve for a pressure swing adsorption gas circuit system according to claim 3, characterized in that: The elastic mechanism comprises a spring (7), the spring (7) being sleeved on the outside of the connecting rod portion (52), and the two ends of the spring (7) being respectively connected to the piston (5) and the bottom surface of the counterbore (22).

5. The integrated control valve for a pressure swing adsorption gas circuit system according to claim 1, characterized in that: Two sealing rings (8) are mounted on the valve sleeve (2) to seal the gap between the valve sleeve (2) and the concave cavity (11); the two sealing rings (8) are arranged at intervals along the depth direction of the concave cavity (11); the second through hole (212) is located between the two sealing rings (8); and the exhaust hole (16) is connected to the gap between the valve sleeve (2) and the concave cavity (11) between the two sealing rings (8).

6. The integrated control valve for a pressure swing adsorption gas circuit system according to claim 1, characterized in that: The opening end of the concave cavity (11) is provided with a positioning depression (111), the valve sleeve (2) is provided with a positioning boss (26) abutting against the positioning depression (111), and the end plate (6) is connected to the valve body (1) via a fastener and presses the positioning boss (26) onto the positioning depression (111).

7. The integrated control valve for a pressure swing adsorption gas circuit system according to any one of claims 1 to 6, characterized in that: The connecting hole (13) is a straight hole connecting the bottom surfaces of the two concave cavities (11).

8. The integrated control valve for a pressure swing adsorption gas circuit system according to any one of claims 1 to 6, characterized in that: The air inlet (14) and all the air outlet holes (16) are arranged on one side of the valve body (1), and all the air inlet and outlet holes (15) are located on the other side of the valve body (1).

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