CN218152623U

CN218152623U - Gas distribution valve

Info

Publication number: CN218152623U
Application number: CN202221841278.8U
Authority: CN
Inventors: 黎曹阳
Original assignee: Ningbo Zhihe Pneumatic Technology Co ltd
Current assignee: Ningbo Zhihe Pneumatic Technology Co ltd
Priority date: 2022-07-15
Filing date: 2022-07-15
Publication date: 2022-12-27
Anticipated expiration: 2032-07-15

Abstract

The utility model discloses a gas distribution valve, gas distribution valve includes: the valve body is provided with a sliding channel, an air inlet channel, at least one working channel, an exhaust channel, a piston cavity and a pilot channel communicated with the air inlet channel, and the pilot channel is communicated with the piston cavity. And the piston assembly is connected with the wall of the piston cavity in a sealing way. The valve core assembly is connected with the sliding channel in a sliding mode and comprises a valve rod, a sliding sealing piece, an on-off sealing piece and an elastic piece, the valve rod abuts against the piston assembly under the elastic force of the elastic piece, the sliding sealing piece is connected with the joint surface of the sliding channel in an elastic sealing mode, the on-off sealing piece is movable between the air inlet channel and the air exhaust channel, and the on-off sealing piece seals the air inlet channel or the air exhaust channel when the valve rod slides to a preset position. And the electromagnetic assembly is arranged on the valve body. The piston assembly has good operation stability and the service life of the gas distribution valve is long.

Description

Gas distribution valve

Technical Field

The utility model belongs to the technical field of the solenoid valve technique and specifically relates to a gas distribution valve is related to.

Background

The oxygen generator is used for separating oxygen in the air so as to improve the concentration of the output or stored oxygen. The oxygen generator comprises a molecular sieve for separating oxygen and other gases, a gas distribution valve and a gas storage device which are arranged on the molecular sieve, and a compressor connected with the gas distribution valve, wherein the gas input by the compressor is introduced into the molecular sieve by the gas distribution valve, and the residual gas after the oxygen is separated from the molecular sieve is discharged to the atmosphere through the gas distribution valve.

Chinese patent CN202122294408.2 discloses a gas distribution valve, an oxygen generation component and an oxygen generator, wherein the gas distribution valve comprises: the valve body is provided with a sliding channel, an air inlet channel, at least one working channel, an exhaust channel and a pilot channel, wherein the air inlet channel, the working channel and the exhaust channel are sequentially distributed and are communicated with the sliding channel. And the valve core assembly is connected to the sliding channel in a sliding mode and comprises a valve rod, a diaphragm, a sealing piece and an elastic piece, and the edge of the diaphragm is fixed by the valve body in a sealing mode. A pilot cavity is formed between the diaphragm and the valve body and is communicated with the pilot channel. The sealing element is movably arranged in the sliding channel, the elastic element is abutted against the valve body, and the sealing element has the tendency of separating the exhaust channel from the working channel under the action of the elastic force of the elastic element. And a pilot assembly mounted on the valve body.

The valve core assembly adopts the reciprocating elastic deformation movement of the diaphragm made of elastic materials to be used as the driving force of the valve rod. However, the elastic membrane is subjected to a large force during the reciprocating movement and can be damaged after a period of operation, so that the whole gas distribution valve fails, and the oxygen generator cannot work normally, and therefore improvement is needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a gas distribution valve.

The utility model discloses the technical scheme who adopts: a gas distribution valve comprising:

the valve body is provided with a sliding channel, an air inlet channel, at least one working channel, an exhaust channel, a piston cavity and a pilot channel communicated with the air inlet channel, wherein the air inlet channel, the working channel, the exhaust channel and the piston cavity are sequentially distributed at intervals and are communicated with the sliding channel, and the pilot channel is communicated with the piston cavity;

the piston assembly is connected with the piston cavity in a sliding mode and is in sealing connection with the cavity wall of the piston cavity;

the valve core assembly is connected with the sliding channel in a sliding mode and comprises a valve rod, a sliding sealing element, an on-off sealing element and an elastic element, the sliding sealing element is installed on the valve rod, the elastic element is elastically abutted against the valve rod, the valve rod abuts against the piston assembly under the action of elastic force of the elastic element, the sliding sealing element is elastically and hermetically connected with a joint surface of the sliding channel, the on-off sealing element is movably arranged between the air inlet channel and the air outlet channel, and the on-off sealing element seals the air inlet channel or the air outlet channel when the valve rod slides to a preset position;

and the electromagnetic assembly is arranged on the valve body and used for controlling the on-off of the pilot channel and the piston cavity.

In one embodiment, the valve rod peripheral wall is concavely formed with one or more first air guide grooves and second air guide grooves, the valve rod is sleeved with the on-off sealing member, the first air guide grooves extend from the on-off sealing member to the air inlet channel direction, and the second air guide grooves are distributed on the surface of the valve rod between the sliding sealing member and the on-off sealing member.

In an embodiment, the valve rod includes a baffle portion, a first guide portion and a second guide portion protruding from the back on two sides of the baffle portion, and a sliding portion extending from the first guide portion, the first air guide groove is distributed in the first guide portion, the second air guide groove is distributed in the second guide portion, the on-off sealing member includes a first sealing gasket and a second sealing gasket, the first sealing gasket is sleeved on the first guide portion and abutted against the baffle portion, the second sealing gasket is sleeved on the second guide portion and abutted against the baffle portion, and the sliding sealing member is assembled on the sliding portion.

In one embodiment, the sliding seal includes a mounting body and a sealing rib projecting obliquely from the mounting body, the sealing rib extending toward a side of the on-off seal.

In an embodiment, the valve body includes a seat body, a valve cover mounted on the seat body, and a mounting bracket connected to the seat body in an inserting manner, a piston cavity is formed between the valve cover and the mounting bracket, the air inlet channel, the working channel, the exhaust channel, and the pilot channel are disposed on the seat body, the mounting bracket is configured with an air guide channel communicated with the working channel and the exhaust channel, and the valve core assembly is slidably connected to the air guide channel.

In an embodiment, the mounting bracket includes a pipe body portion, a flange portion disposed at one end of the pipe body portion, and a partition portion disposed at the other end of the pipe body portion, the air guide channel penetrates through the flange portion to the partition portion, a via hole communicating the exhaust channel with the air guide channel is disposed on the outer peripheral wall of the pipe body portion, the valve cover is crimped to the flange portion and forms the piston cavity with the flange portion, the seat body is provided with an air guide hole penetrating through the partition plates of the intake channel and the working channel, one end of the valve core assembly is inserted into the air guide hole, and the on-off sealing member is movable between the partition portion and the partition plate where the air guide hole is located.

In one embodiment, the seat body includes a planar installation surface, an installation surface intersecting with the installation surface, and a stepped hole recessed from the installation surface, the installation frame is assembled to the seat body from the stepped hole, the intake passage, the working passage, and the exhaust passage are recessed from the installation surface and intersect with the stepped hole, and the air guide hole is a part of the stepped hole.

In one embodiment, the piston assembly comprises a piston frame and a piston sealing ring sleeved on the piston frame, the piston sealing ring is connected with the cavity wall of the piston cavity in a sealing manner, and an air outlet of the pilot channel is over against the middle of the piston frame.

In one embodiment, the piston frame is provided with a sliding column which is connected with the valve body in an inserting way.

In one embodiment, the valve body is provided with two working channels and two exhaust channels which are symmetrically distributed on two sides of the air inlet channel, and the piston assembly, the valve core assembly and the electromagnetic assembly are symmetrically assembled on the valve body.

After the structure is adopted, compared with the prior art, the utility model the advantage that has is: the piston assembly is pushed by air pressure to move when the pilot channel is opened, and pushes the valve core assembly to overcome the elastic force of the elastic piece to move, so that the on-off sealing piece seals the air inlet channel. The electromagnetic assembly controls the pilot channel to be closed, the valve core assembly moves under the elastic force action of the elastic piece and pushes the piston assembly to move and reset, so that the on-off sealing piece opens the air inlet channel and closes the exhaust channel, the piston assembly is good in operation stability, and the service life of the gas distribution valve is long.

Drawings

The invention will be further described with reference to the following figures and examples:

fig. 1 is a first angle structure diagram of the gas distribution valve of the present invention.

Fig. 2 is a second angle structure diagram of the gas distribution valve of the present invention.

Fig. 3 is a schematic cross-sectional structural view of the gas distribution valve of the present invention.

Fig. 4 is an enlarged schematic view of a structure at a in fig. 3.

Fig. 5 is a schematic structural diagram of the valve core assembly of the present invention.

Fig. 6 is a schematic structural diagram of the valve rod of the present invention.

In the figure: a valve body 10; an intake passage 11; a working channel 12; an exhaust passage 13; a slide channel 14; a pilot passage 15; a base 16; air vents 161; a fitting hole 162; a mounting face 163; a support plate 164; a valve cover 17; a mounting frame 18; a body portion 181; a slide hole 1811; a flange portion 182; the partition 183; a via hole 1831; a piston chamber 19; an electromagnetic assembly 20; a valve core assembly 30; a valve stem 31; a baffle portion 311; the first guide portion 312; a second guide portion 313; a first gas-guiding groove 314; a second gas-guiding groove 315; an on-off seal 32; a first gasket 321; a second gasket 322; a sliding seal 33; an elastic member 34.

Detailed Description

The following description is only a preferred embodiment of the present invention, and does not limit the scope of the present invention.

Embodiments, as shown in fig. 1 to 6, the utility model discloses a gas distribution valve, the gas distribution valve includes valve body 10, sliding connection in the piston assembly of valve body 10, case subassembly 30 and install in the electromagnetism subassembly 20 of valve body 10, and valve body 10 is the rigid frame piece, and it can adopt plastic material to make.

Specifically, the valve body 10 is provided with a sliding channel 14, an air inlet channel 11, at least one working channel 12, an air outlet channel 13, a piston cavity 19 and a pilot channel 15 communicated with the air inlet channel 11, the working channel 12, the air outlet channel 13 and the piston cavity 19 are distributed at intervals in sequence and are all communicated with the sliding channel 14, and the pilot channel 15 is communicated with the piston cavity 19. The air inlet channel 11, the working channel 12 and the air outlet channel 13 are all communicated with the sliding channel 14, the valve core assembly 30 is connected to the sliding channel 14 in a sliding mode, and in the sliding process of the valve core assembly 30, the valve core assembly 30 can block the air inlet channel 11 from the working channel 12 and can communicate the air outlet channel 13 with the working channel 12; alternatively, the spool assembly 30 may block the exhaust passage 13 from the working passage 12 and communicate the intake passage 11 with the working passage 12.

The valve core assembly 30 can be closed at the channel port of the exhaust channel 13 to block the exhaust channel 13 from the working channel 12; alternatively, the spool assembly 30 is closed at a stepped surface of the slide channel 14, which is located between the exhaust channel 13 and the working channel 12 to block the exhaust channel 13 from the working channel 12. Based on the same principle, the valve core assembly 30 can block the air inlet channel 11 and the working channel 12, and the description is omitted.

The piston assembly is slidably connected to the piston cavity 19, wherein the piston assembly is hermetically connected with the cavity wall of the piston cavity 19. Specifically, the piston cavity 19 is a straight hole structure, the piston assembly moves along the axial direction of the piston cavity 19, and the piston assembly divides the piston cavity 19 into two movably-variable chambers to push the valve core assembly 30 to linearly reciprocate.

The valve core assembly 30 comprises a valve rod 31, a sliding sealing piece 33 installed on the valve rod 31, an on-off sealing piece 32 and an elastic piece 34 elastically abutted to the valve rod 31, the valve rod 31 abuts to the piston assembly under the elastic force action of the elastic piece 34, the sliding sealing piece 33 is in elastic sealing connection with the combining surface of the sliding channel 14, the on-off sealing piece 32 moves between the air inlet channel 11 and the air outlet channel 13, and the on-off sealing piece 32 is used for sealing the air inlet channel 11 or the air outlet channel 13 when the valve rod 31 slides to a preset position. The solenoid assembly 20 is used for controlling the connection and disconnection between the pilot channel 15 and the piston cavity 19, and specifically, the solenoid assembly 20 opens the pilot channel 15 in the power-on condition and blocks the pilot channel 15 in the power-off condition.

The valve rod 31 and the piston assembly abut against each other to realize mutual abutting movement, so that the valve core assembly 30 moves back and forth along the central line of the sliding channel 14. The on-off seal 32 moves with the valve stem 31 and moves in the slide passage 14, so that the on-off seal 32 blocks the working passage 12 from the exhaust passage 13 or the intake passage 11 during the movement. In the initial state, the elastic member 34 abuts against the valve body 10, and the on-off seal 32 tends to separate the exhaust passage 13 and the working passage 12 by the elastic force of the elastic member 34. That is, in the initial non-operating state, the air pressure in the piston chamber 19 is low, the valve rod 31 pushes the piston assembly to move toward the solenoid assembly 20 by the elastic force of the elastic member 34, and the on-off sealing member 32 blocks the exhaust passage 13 and the working passage 12, so that the exhaust passage 13 and the working passage 12 are in a blocked state, and the intake passage 11 and the working passage 12 are in a communicated state.

When the electromagnetic assembly 20 is powered off and blocks the pilot channel 15, the piston cavity 19 is communicated with the pressure relief channel, so that the air pressure in the piston cavity 19 is reduced, and the valve rod 31 separates the exhaust channel 13 from the working channel 12 under the elastic force of the elastic piece 34, so that the air in the air inlet channel 11 enters the working channel 12 along the sliding channel 14 and then enters the molecular sieve. When the electromagnetic assembly 20 is electrically conducted to the pilot channel 15, pressure gas in the air inlet channel 11 enters the piston cavity 19 along the pilot channel 15, the piston assembly moves towards one side of the valve core assembly 30 under the action of air pressure, the valve rod 31 moves against the elastic force of the elastic piece 34 under the action of thrust of the piston assembly, the on-off sealing piece 32 separates the air inlet channel 11 from the working channel 12, the working channel 12 is communicated with the exhaust channel 13, and waste gas generated by the gas separator is discharged through the exhaust channel 13. The remagnetizing assembly 20 is powered off to block the pilot channel 15, and the operation is repeated in a circulating mode, so that the circulating operation of the gas separator is realized.

Therefore, the plug assembly is moved by the air pressure when the pilot passage 15 is opened, and pushes the valve spool assembly 30 to move against the elastic force of the elastic member 34, thereby causing the on-off sealing member 32 to close the intake passage 11. The electromagnetic assembly 20 controls the pilot channel 15 to be closed, the valve core assembly 30 moves under the action of the elastic force of the elastic piece 34 and pushes the piston assembly to move and reset, and therefore the on-off sealing piece 32 opens the air inlet channel 11 and closes the air outlet channel 13, the operation stability of the piston assembly is good, and the service life of the gas distribution valve is long.

The valve rod 31 is a movable member sliding on the valve body 10, and the moving position thereof controls the opening and closing of the corresponding passage. The valve rod 31 has one or more first air guide grooves 314 and second air guide grooves 315 formed in a recessed manner in an outer circumferential wall of the valve rod 31, the on-off sealing member 32 is sleeved on the valve rod 31, the first air guide grooves 314 extend from the on-off sealing member 32 in a direction toward the air intake passage 11, and the second air guide grooves 315 are distributed on a surface of the valve rod 31 between the sliding sealing member 33 and the on-off sealing member 32. The on-off sealing member 32 is used for controlling the on-off of the air inlet channel 11 and the air outlet channel 13, the valve rod 31 is connected with the valve body 10 in a sliding mode, and the first air guide groove 314 and the second air guide groove 315 can maintain the matching accuracy between the valve rod 31 and the sliding channel 14 and can also maintain the smooth air circulation. The first air guide groove 314 and the second air guide groove 315 are respectively distributed on both sides of the on-off sealing member 32, so that air can circulate along the first air guide groove 314 or the second air guide groove 315 when the on-off sealing member 32 is in an unsealed state. Alternatively, the valve rod 31 is an integral stepped shaft-shaped structure, the sliding seal 33 is connected to one end of the valve rod 31, and the on-off seal 32 is sleeved on the valve rod 31 and limited at the stepped shaft.

Specifically, the valve rod 31 includes a baffle portion 311, a first guide portion 312 and a second guide portion 313 protruding from two opposite sides of the baffle portion 311, and a sliding portion extending from the first guide portion 312, wherein the first air guide groove 314 is distributed on the first guide portion 312, and the second air guide groove 315 is distributed on the second guide portion 313.

The first guide portion 312 and the second guide portion 313 protrude from both sides of the baffle portion 311 to form a stepped shaft structure, and the first guide portion 312 and the second guide portion 313 have a shaft-like structure and axes thereof are overlapped. The first air guide groove 314 extends from the baffle portion 311 to an end portion of the first guide portion 312, and the second air guide groove 315 extends from the flange portion to the second guide portion 313 so that a passage is formed in outer peripheral walls of the first guide portion 312 and the second guide portion 313. The number of the first air guiding grooves 314 and the number of the second air guiding grooves 315 may be one or more, for example, the first guiding portions 312 are distributed in the form of air guiding grooves similar to a spline structure. The shapes of the first air guide groove 314 and the second air guide groove 315 can be flexibly adjusted according to the air guide area and the matching structure, for example, the first air guide groove 314 and the second air guide groove 315 are arranged into a V-shaped groove, a rectangular groove, a fan-shaped groove and other structures.

. The on-off sealing member 32 includes a first packing 321 and a second packing 322, the first packing 321 is sleeved on the first guide portion 312 and abuts against the baffle portion 311, the second packing 322 is sleeved on the second guide portion 313 and abuts against the baffle portion 311, and the sliding sealing member 33 is assembled on the sliding portion. The baffle portion 311 is protruded in a step shape, and the first sealing gasket 321 and the second sealing gasket 322 are respectively located at both sides of the baffle portion 311. When the first packing 321 abuts against the valve body 10, the first packing 321 blocks the working passage 12 and the exhaust passage 13, and the second packing 322 is spaced apart from the intake passage 11 to communicate the intake passage 11 with the working passage 12. On the contrary, the second packing 322 blocks the working channel 12 and the intake channel 11, and the first packing 321 is spaced apart from the exhaust channel 13 to communicate the exhaust channel 13 with the working channel 12. The baffle portion 311 supports the first gasket 321 and the second gasket 322, respectively, to maintain the sealing reliability and the sealing property of the first gasket 321 and the second gasket 322. Alternatively, a catching groove is formed at the intersection of the first guide portion 312 and the baffle portion 311, and the first packing 321 is defined in the catching groove. Optionally, a catching groove is formed at the intersection of the second guide portion 313 and the baffle portion 311, and the second gasket 322 is defined in the catching groove.

One end of the elastic member 34 abuts against the valve body 10, and the other end abuts against the valve rod 31. Optionally, a support plate 164 is disposed in the intake passage 11, and the elastic member 34 is configured as a compression spring, one end of which abuts against the support plate 164 and the other end of which abuts against the valve stem 31, so that the elastic force is directed toward the piston assembly.

The sliding seal 33 is used for sealing the space between the exhaust channel 13 and the piston chamber 19 of the valve rod 31, and is used for sealing the gap between the valve rod 31 and the sliding channel 14, so that the sliding smoothness of the valve core assembly 30 is maintained, and the controllability of an airflow channel is maintained. In one embodiment, the sliding seal 33 includes a mounting body and a seal rib projecting obliquely from the mounting body, the seal rib extending toward the side of the on-off seal 32. The cross section of the sliding seal 33 is approximately a V-shaped structure in which the opening of the sliding seal 33 is directed toward the on-off seal 32 side to elastically deform the sliding seal 33 by the air pressure on the intake passage 11 side and maintain the seal of the seal valve stem 31 and the sliding passage 14.

The sliding passage 14 may be provided in the valve body 10 to form a passage structure, and the passage structure may be directly opened in the valve body 10 or may be formed by combining a plurality of components constituting the valve body 10. In one embodiment, the valve body 10 includes a seat body 16, a valve cover 17 mounted on the seat body 16, and a mounting frame 18 inserted into the seat body 16. The base 16 is a hollow structure, and the mounting frame 18 is fixed to the base 16 by inserting so that the two are fixed together. Specifically, the holder body 16 is provided with a fitting hole 162 extending from one end to the other end of the holder body 16, the mounting bracket 18 is inserted into the fitting hole 162 and mounted to the holder body 16, and the mounting bracket 18 and the holder body 16 together form the slide passage 14. The valve cover 17 is connected to the seat 16 and closes the opening of the sliding channel 14, a piston cavity 19 is formed between the valve cover 17 and the mounting frame 18, and the sliding seal 33 is sleeved on the valve rod 31 to block the gas communication channel between the sliding channel 14 and the piston cavity 19, so that the valve rod 31 pushes the piston assembly to move.

The air inlet channel 11, the working channel 12, the air outlet channel 13 and the pilot channel 15 are arranged on the seat body 16, the mounting frame 18 is provided with an air guide channel communicated with the working channel 12 and the air outlet channel 13, and the valve core assembly 30 is connected to the air guide channel in a sliding manner. The center lines of the working channel 12 and the exhaust channel 13 are intersected with the center line of the air guide channel, so that one of the valve core assembly 30 can be communicated when sliding along the air guide channel.

The mounting bracket 18 includes a body portion 181, a flange portion 182 provided at one end of the body portion 181, and a partition portion 183 provided at the other end of the body portion 181, and an air guide passage extends from the flange portion 182 to the partition portion 183. The air guide passage traverses the entire mounting bracket 18 to form a thin-walled tubular structure, and the air guide passage forms a stepped bore structure. Wherein, the flange part 182 is located at one end of the body part 181, and the flange part 182 is bent and protruded outwards from the outer circumferential wall of the body part 181. The pipe body part 181 is inserted into the seat body 16 until the flange part 182 abuts against the seat body 16, and the mounting position accuracy is high. The valve cover 17 is assembled on the seat body 16 and pressed on the flange part 182 to fix the mounting frame 18, and the piston cavity 19 is formed between the valve cover 17 and the flange part 182, so that the assembly is convenient.

The outer peripheral wall of the pipe body portion 181 is provided with a through hole 184 communicating the air discharge passage 13 and the air guide passage, and the spool assembly 30 is slidably connected to the air guide passage. The seat body 16 has an air guide hole 161 formed through a partition between the intake passage 11 and the working passage 12, and the air guide hole 161 and the slide hole 1811 are parallel to each other. One end of the valve core assembly 30 is inserted into the air guide hole 161, and the on-off sealing member 32 is movable between the partition 183 and the partition where the air guide hole 161 is located, so that the on-off sealing member 32 seals the sliding hole 1811 or the air guide hole 161, thereby controlling the corresponding air flowing direction.

For example, the through holes 184 are configured as a hole structure penetrating through the tube body 181, wherein the number of the through holes 184 is two or more, so as to increase the flow area of the gas flow. Optionally, the vias 184 are evenly distributed around the centerline of the body portion 181. The first guide portion 312 slides in the slide hole 1811 of the body portion 181 and communicates the working passage 12 and the exhaust passage 13 through the first air guide groove 314. On the contrary, the second guide portion 313 slides in the air guide hole 161 of the seat 16, and communicates the working channel 12 and the air inlet channel 11 through the second air guide groove 315.

Seat 16 is used to connect a gas distribution valve to the molecular sieve assembly to provide air to the molecular sieve assembly. Alternatively, the intake passage 11, the working passage 12 and the exhaust passage 13 may be connected to the molecular sieve assembly through connected pipes to improve installation flexibility. Alternatively, the seat 16 is directly mounted to the surface of the molecular sieve assembly, wherein the seat 16 includes a planar mounting surface, a mounting surface 163 intersecting the mounting surface, and a mounting hole 162 recessed from the mounting surface, and the mounting block 18 is mounted to the seat 16 from the mounting hole 162. The intake passage 11, the working passage 12, and the exhaust passage 13 are recessed from the mounting surface 163 and intersect the mounting hole 162, and the air-guide hole 161 is a part of the mounting hole 162.

The assembly surface 163 is attached to the surface of the molecular sieve assembly, and the junction surface has good sealing performance. Optionally, a concave sealing groove is disposed on the assembling surface 163, and an on-off sealing element 32 is installed in the sealing groove to improve the sealing effect between the seat body 16 and the molecular sieve assembly. The openings of the air inlet channel 11, the working channel 12 and the air outlet channel 13 are all arranged on the assembling surface 163, and the assembling effect is good.

The piston assembly is slidably connected to the piston cavity 19, wherein the piston assembly comprises a piston frame and a piston sealing ring sleeved on the piston frame, the piston sealing ring is hermetically connected with the cavity wall of the piston cavity 19, and an air outlet of the pilot channel 15 is opposite to the middle part of the piston frame. The piston frame is a rigid structural part and is used for supporting the piston sealing ring. Preferably, the piston frame is of a plate-shaped structure, a groove is formed in the peripheral wall of the piston frame, and the piston sealing ring is sleeved and limited in the groove. The air outlet of the pilot channel 15 is over against the middle part of the piston frame to improve the stress balance of the piston frame.

Preferably, the piston holder is provided with a sliding post, which is inserted into the valve body 10. The sliding column is of a convex structure, correspondingly, the valve body 10 is provided with a convex guide pipe or a guide convex rib and other guide mechanisms, and the sliding column is inserted in the guide mechanisms so as to improve the moving stability and the guiding reliability of the piston assembly.

Preferably, the piston seal ring and the sliding seal 33 have substantially the same structure, except that the installation direction of the piston seal ring is opposite to that of the movable seal, that is, the sealing rib of the piston seal ring extends towards the direction away from the mounting frame 18, and the tail end of the sealing rib is elastically attached to the cavity wall of the piston cavity 19, so that the sealing rib is closely attached to the cavity wall of the piston cavity 19 under the action of the gas output from the gas guide channel, and the sealing effect is good.

On the basis of the above embodiment, the gas distribution valve may be configured with a single working channel 12 and exhaust channel 13, or two or more groups of working channels 12 and exhaust channels 13 may be provided and share the same intake channel 11, so that the gas distribution component can alternately separate gas, thereby improving gas separation efficiency. The air inlet channel 11, the working channel 12 and the air outlet channel 13 all form a group of air flow channels and are positioned on the same straight line, the two groups of air flow channels are intersected with the air inlet channel 11, and the intersection angle can be flexibly set, for example, the two groups of air flow channels are positioned on the same straight line; the two sets of airflow channels intersect at a specified angle to accommodate different configurations. The multiple groups of airflow channels form an alternate operation mode of the gas distribution component, and the gas separation efficiency is improved. Optionally. The working channel 12 and the exhaust channel 13 are both provided with two and symmetrically distributed at two sides of the air inlet channel 11 to improve the stability of structural installation and the balance of stress, and accordingly, the piston assembly, the valve core assembly 30 and the electromagnetic assembly 20 are symmetrically assembled on the valve body 10.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application. Other structures and principles are the same as those of the prior art, and are not described in detail herein.

Claims

1. A gas distribution valve, comprising:

the valve body is provided with a sliding channel, an air inlet channel, at least one working channel, an exhaust channel, a piston cavity and a pilot channel communicated with the air inlet channel, wherein the air inlet channel, the working channel, the exhaust channel and the piston cavity are sequentially distributed at intervals and are all communicated with the sliding channel, and the pilot channel is communicated with the piston cavity;

the valve core assembly is slidably connected with the sliding channel and comprises a valve rod, a sliding sealing element, an on-off sealing element and an elastic element, the sliding sealing element is arranged on the valve rod, the elastic element is elastically abutted against the valve rod, the valve rod is abutted against the piston assembly under the action of elastic force of the elastic element, the sliding sealing element is elastically and hermetically connected with a joint surface of the sliding channel, the on-off sealing element is movably arranged between the air inlet channel and the exhaust channel, and the on-off sealing element seals the air inlet channel or the exhaust channel when the valve rod slides to a preset position;

2. The gas distribution valve of claim 1, wherein the valve stem has a peripheral wall that is recessed to form one or more first and second gas guide grooves, the on-off sealing member is disposed on the valve stem, the first gas guide groove extends from the on-off sealing member toward the gas inlet channel, and the second gas guide groove is disposed on a surface of the valve stem between the sliding sealing member and the on-off sealing member.

3. The gas distribution valve of claim 2, wherein the valve stem comprises a baffle portion, a first guide portion and a second guide portion protruding from two sides of the baffle portion in a back direction, and a sliding portion extending from the first guide portion, the first gas guide grooves are distributed in the first guide portion, the second gas guide grooves are distributed in the second guide portion, the on-off sealing member comprises a first sealing gasket and a second sealing gasket, the first sealing gasket is sleeved on the first guide portion and abutted against the baffle portion, the second sealing gasket is sleeved on the second guide portion and abutted against the baffle portion, and the sliding sealing member is assembled on the sliding portion.

4. The gas distribution valve of claim 1, wherein the sliding seal includes a mounting body and a sealing rib projecting obliquely from the mounting body, the sealing rib extending toward a side of the on-off seal.

5. The gas distribution valve of claim 1, wherein the valve body comprises a seat body, a valve cover mounted on the seat body, and a mounting frame connected to the seat body in a plugging manner, a piston cavity is formed between the valve cover and the mounting frame, the air inlet channel, the working channel, the exhaust channel, and the pilot channel are disposed on the seat body, the mounting frame is configured with an air guide channel communicated with the working channel and the exhaust channel, and the valve core assembly is slidably connected to the air guide channel.

6. The gas distribution valve of claim 5, wherein the mounting bracket includes a body portion, a flange portion disposed at one end of the body portion, and a partition portion disposed at the other end of the body portion, the gas channel extends from the flange portion to the partition portion, a through hole is disposed on the outer peripheral wall of the body portion to communicate the gas exhaust channel with the gas channel, the valve cover is pressed against the flange portion and forms the piston cavity with the flange portion, the seat body is provided with a gas guide hole penetrating through a partition of the gas inlet channel and the working channel, one end of the valve core assembly is inserted into the gas guide hole, and the on-off sealing member is movable between the partition portion and the partition where the gas guide hole is located.

7. The gas distribution valve of claim 6, wherein the seat body includes a planar mounting surface, a mounting surface intersecting the mounting surface, and a stepped bore recessed from the mounting surface, the mounting bracket being mounted to the seat body from the stepped bore, the inlet passage, working passage, and exhaust passage being recessed from the mounting surface and intersecting the stepped bore, the gas vent being part of the stepped bore.

8. The gas distribution valve of claim 1, wherein the piston assembly comprises a piston frame and a piston sealing ring sleeved on the piston frame, the piston sealing ring is connected with the chamber wall of the piston chamber in a sealing manner, and the gas outlet of the pilot channel faces the middle part of the piston frame.

9. The gas distribution valve according to claim 8, wherein the piston holder is provided with a sliding post, which is plugged into the valve body.

10. The gas distribution valve according to any one of claims 1 to 9, wherein the valve body is provided with two working channels and two exhaust channels which are symmetrically distributed on both sides of the gas inlet channel, and the piston assembly, the valve core assembly and the electromagnetic assembly are symmetrically assembled on the valve body.