Control electromagnetic valve

Abstract

The utility model provides a control electromagnetic valve which comprises a main valve and a guide valve, and the main valve comprises a valve body, a main valve core, a guide sleeve, a main valve spring, a piston and an end cover. A first channel and a second channel are formed in the inner side of the valve body, the first channel comprises a large-diameter part and a small-diameter part, the main valve element, the guide sleeve, the main valve spring and the piston are all located in the large-diameter part, and the end cover is located at one end of the valve body. The valve body is provided with a containing part, a third channel and a fourth channel. An air inlet of the third channel is communicated with the air inlet end of the first channel, an air outlet of the third channel is communicated with the air inlet end of the containing part, the air outlet end of the containing part is communicated with an air inlet of the fourth channel, and an air outlet of the fourth channel is communicated with an air hole in the guide sleeve. The guide valve comprises an electromagnet assembly, an upper guide valve ejector rod, a lower guide valve ejector rod, a first guide spring and a guide valve element. The guide valve element moves up and down so that the third channel and the fourth channel can be communicated and closed. The working performance and reliability of the electromagnetic valve can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power system valves, especially a control solenoid valve. Background Art

[0002] With the rapid development of the aerospace industry, various technologies involved in the rocket field have also advanced by leaps and bounds. Especially for solenoid valves, during the startup and shutdown phases of a liquid oxygen-methane engine, solenoid valves are required to open and close to control the opening and closing of the downstream propellant control valve, thereby achieving the on-off of the propellant and the combustion chamber. Due to their advantages such as high pressure, large diameter, fast response, and high reliability, solenoid valves can effectively ensure that liquid rocket engines complete the startup and shutdown processes in sequence. In addition, solenoid valves can also be used to control the on-off of other gas circuits in the engine.

[0003] Currently, the pilot valve push rod assembly in solenoid valves adopts an integrated design. Since the pilot valve push rod assembly and the pilot valve spool are rigid components, during the cooperation process between the pilot valve push rod assembly and the pilot valve spool, it is extremely easy for the pilot valve push rod assembly and the pilot valve spool to be damaged, reducing the sealing performance of the pilot valve spool, seriously affecting the product reliability, and shortening the service life of the solenoid valve.

[0004] There is an urgent need to provide a control solenoid valve that can avoid damage to the pilot valve push rod assembly and the pilot valve spool during the working process, improve the working performance and reliability of the valve, and extend the service life of the solenoid valve. Summary of the Invention

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a control solenoid valve. This solenoid valve can avoid damage to the pilot valve push rod assembly and the pilot valve spool due to repeated contact during the working process, and can also improve the working performance and reliability of the valve, and extend the service life of the solenoid valve.

[0006] The utility model provides a control solenoid valve, which includes a main valve and a pilot valve.

[0007] The main valve includes a valve body, a main valve spool, a guide sleeve, a main valve spring, a piston, and an end cap.

[0008] The inner side of the valve body has a first channel for gas flow and a second channel that is connected to the first channel and has a different extending direction. The first channel includes a large-diameter part and a small-diameter part. The main valve spool, the guide sleeve, the main valve spring, and the piston are all located in the large-diameter part, and the end cap is located at one end of the valve body.

[0009] A receiving portion, a third channel and a fourth channel are provided at a part of the valve body radially away from the first channel; an air inlet of the third channel communicates with an air inlet end of the first channel at the small-diameter part, an air outlet of the third channel communicates with an air inlet end of the receiving portion, an air outlet end of the receiving portion communicates with an air inlet of the fourth channel, and an air outlet of the fourth channel communicates with an air hole on the guide sleeve.

[0010] The pilot valve includes an electromagnet assembly, an upper pilot valve push rod, a lower pilot valve push rod, a first guide spring and a pilot valve spool. The upper pilot valve push rod and the lower pilot valve push rod are both located inside the electromagnet assembly. The lower end of the upper pilot valve push rod is connected to the upper end of the first guide spring, the lower end of the first guide spring is connected to the upper end of the lower pilot valve push rod, the lower end of the lower pilot valve push rod is used to be connected to the pilot valve spool, and the pilot valve spool is located inside the receiving portion. The pilot valve spool is controlled to move up and down by the energization and de-energization of the electromagnet assembly, so as to open or close the third channel and the fourth channel.

[0011] When the pilot valve is opened, the gas medium passes through the air inlet end of the small-diameter part, sequentially passes through the third channel, the receiving portion, the fourth channel, and the air hole, and then pushes the piston to move towards the side away from the end cover to drive the main valve spool to move along the axial direction of the first channel, so that one end of the main valve spool abuts against the transition part of the large-diameter part towards the small-diameter part, thereby completing the closing of the main valve.

[0012] In the same embodiment, first concave portions and a first annular groove recessed towards each other are respectively provided at both ends of the main valve spool along the axial direction of the first channel. A first seal and a second seal respectively matching the shapes of the first concave portions and the first annular groove are provided in the first concave portions and the first annular groove.

[0013] In the same embodiment, the outer shape of the guide sleeve is a U-shaped structure. The open end of the U-shaped structure extends towards the main valve spool. An air hole communicating with the fourth channel is provided at the closed end of the U-shaped structure. Among them, a limiting table surface for restricting the movement of the piston sleeve is formed at the transition part of the inner side wall of the U-shaped structure towards the closed end.

[0014] In the same embodiment, the piston includes a convex column and a guide column integrally formed. One end of the convex column extends towards the main valve spool, and the other end is connected to one end of the guide column. A second concave portion for fixing one end of the main valve spring is provided at the other end of the guide column.

[0015] In the same embodiment, a second annular groove is provided on the outer circumference of the guide post along the guide post, and a third seal is provided in the second annular groove. The inner side of the third seal is arranged in the second annular groove, and the outer side of the third seal abuts against the inner wall of the guide sleeve.

[0016] In the same embodiment, the pilot valve is fixed to the main valve through a lock nut on the outer side of the main valve, and the axis of the pilot valve is perpendicular to the axis of the main valve; a cylindrical rubber bowl for exhausting gas is provided on the outer circumference of one end of the pilot valve close to the lock nut.

[0017] In the same embodiment, a limiting platform and a second guiding spring are provided at one end of the pilot valve spool away from the lower pilot valve push rod. Among them, both the limiting platform and the second guiding spring are located in the accommodating part. One end of the second guiding spring abuts against the bottom of the accommodating part, and the other end abuts against the lower end face of the limiting platform.

[0018] In the same embodiment, an exhaust valve is further included. The exhaust valve includes an exhaust housing and an exhaust valve seat. An exhaust hole communicating with the first channel is provided on the exhaust valve seat. The exhaust housing is located outside the valve body. The exhaust valve seat is arranged inside the first channel and between the main valve spool and the piston. The exhaust valve seat is used to discharge the gas entering the first channel from the second channel to the outside of the valve body through the exhaust housing after passing through the inner cavity of the exhaust base.

[0019] In the same embodiment, a third annular groove and a fourth seal matching the third annular groove are provided at the part where the inner wall of the valve body abuts and coincides with the exhaust valve seat. The third annular groove is concave along the inner wall of the valve body toward the side away from the exhaust valve seat. The inner side of the fourth seal abuts against the outer wall of the exhaust valve seat, and the outer side of the fourth seal is located in the third annular groove.

[0020] In the same embodiment, annular fixing grooves for fixing the first guiding spring are respectively provided at the ends of the upper pilot valve push rod and the lower pilot valve push rod close to each other.

[0021] Compared with the prior art, the present utility model has at least one of the following beneficial effects:

[0022] The solenoid valve provided by the embodiment of the present utility model consists of a main valve and a pilot valve, and a first guiding spring is arranged between the upper pilot valve push rod and the lower pilot valve push rod. When the upper pilot valve push rod and the lower pilot valve push rod move, the first guiding spring plays a buffering role, which can avoid hard contact between the lower pilot valve push rod and the pilot valve spool during long-term use, thus preventing damage to each other, ensuring the integrity of the lower pilot valve push rod and the pilot valve spool, facilitating the stable sealing performance of the pilot valve spool, thereby improving the working performance and reliability of the valve and extending the service life of the solenoid valve.

[0023] It should be understood that the above general description and the following specific embodiments are only exemplary and explanatory, and they do not limit the scope of what the present utility model intends to claim. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following drawings are part of the specification of the present utility model, which illustrate the exemplary embodiments of the present utility model. The attached drawings, together with the description of the specification, are used to explain the principle of the present utility model.

[0025] Figure 1 It is a schematic structural diagram of the cross-section of the solenoid valve in the embodiment of the present utility model;

[0026] Figure 2 It is a left view of the solenoid valve in the embodiment of the present utility model.

[0027] Description of the reference numerals:

[0028] 1 valve body 2 main valve spool

[0029] 3 guide sleeve 4 main valve spring

[0030] 5 piston 6 end cover

[0031] 7 first channel 8 second channel

[0032] 9 accommodating part 10 third channel

[0033] 11 fourth channel 12 electromagnet assembly

[0034] 13 upper pilot valve push rod 14 lower pilot valve push rod

[0035] 15 first guiding spring 16 pilot valve spool

[0036] 17 rubber cup 18 exhaust housing

[0037] 19 exhaust valve seat 20 exhaust hole DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The various exemplary embodiments of the present utility model will be described in detail below. This detailed description should not be construed as a limitation on the present utility model, but rather as a more detailed description of certain aspects, characteristics, and implementation schemes of the present utility model.

[0039] Without departing from the scope or spirit of the present utility model, various improvements and changes can be made to the specific embodiments of the description of the present utility model, which are obvious to those skilled in the art. Other embodiments obtained from the description of the present utility model are obvious to those skilled in the art. The description and embodiments of this application are merely exemplary.

[0040] The upper and lower positions of this application refer to the upper and lower positions when the solenoid valve of the embodiment of this application is placed in the orientation as shown in Figure 1 That is, the pilot valve is on the upper side and the main valve is on the lower side. It should not be deliberately confused about the upper and lower positions or make a restrictive interpretation or distortion of the concepts of upper and lower by adjusting the placement state of the product, thereby causing the protection scope of this application to be inappropriately reduced.

[0041] As shown in Figure 1 and Figure 2 The present utility model provides a control solenoid valve, which includes a main valve and a pilot valve.

[0042] The main valve includes a valve body 1, a main valve spool 2, a guide sleeve 3, a main valve spring 4, a piston 5, and an end cap 6. Inside the valve body 1, there is a first channel 7 for gas flow and a second channel 8 that is connected to the first channel 7 and has a different extending direction. The first channel 7 includes a large-diameter part and a small-diameter part. The main valve spool 2, the guide sleeve 3, the main valve spring 4, and the piston 5 are all located inside the large-diameter part, and the end cap 6 is located at one end of the valve body 1.

[0043] A receiving portion 9, a third channel 10, and a fourth channel 11 are provided in a part of the valve body 1 radially away from the first channel 7. The intake port of the third channel 10 is connected to the intake end of the first channel 7, the outlet port of the third channel 10 is connected to the intake end of the receiving portion 9, the outlet end of the receiving portion 9 is connected to the intake port of the fourth channel 11, and the outlet port of the fourth channel 11 is connected to the air hole on the guide sleeve 3.

[0044] The pilot valve includes an electromagnet assembly 12, an upper pilot valve push rod 13, a lower pilot valve push rod 14, a first guiding spring 15, and a pilot valve spool 16. The upper pilot valve push rod 13 and the lower pilot valve push rod 14 are both located inside the electromagnet assembly 12. The lower end of the upper pilot valve push rod 13 is connected to the upper end of the first guiding spring 15, and the lower end of the first guiding spring 15 is connected to the upper end of the lower pilot valve push rod 14 (along the axial direction of the pilot valve push rod 14). The lower end of the lower pilot valve push rod 14 is used to be connected to the pilot valve spool 16. The pilot valve spool 16 is located inside the receiving portion 9 and makes the third channel 10 and the fourth channel 11 conduct and close by moving up and down.

[0045] When the pilot valve opens, the gas medium passes through the intake end of the small-diameter part and successively through the third channel 10, the accommodating part 9, the fourth channel 11, and the air hole (provided in the guide sleeve and located on the limiting platform of the fixed main valve spring 4), and then pushes the piston 5 to move away from the end cover 6, so as to drive the main valve spool 2 to move along the axial direction of the first channel 7, making one end of the main valve spool 2 abut against the transition part from the large-diameter part to the small-diameter part, thus completing the closing of the main valve.

[0046] Specifically, a control solenoid valve provided in an embodiment of the present invention consists of a main valve and a pilot valve. By arranging a first guiding spring 15 between the upper pilot valve push rod 13 and the lower pilot valve push rod 14 in this application of the solenoid valve, when the upper pilot valve push rod 13 and the lower pilot valve push rod 14 move, the first guiding spring 14 can play a buffering role, avoiding hard contact between the lower pilot valve push rod 14 and the pilot valve spool 16 during long-term use, which may cause damage to each other, ensuring the integrity of the lower pilot valve push rod 14 and the pilot valve spool 16, being beneficial to the stable sealing performance of the pilot valve spool 16, thereby improving the working performance and reliability of the valve and prolonging the service life of the solenoid valve.

[0047] In the same embodiment, when the main valve is opened and closed, in order to reduce the leakage of the gas medium from the gaps between the main valve spool 2 and the transition part from the large-diameter part to the small-diameter part and between the main valve spool 2 and the exhaust valve seat 19, for example, on both ends of the main valve spool 2 along the axial direction of the first channel 10, there are respectively a first concave part and a first annular groove that are concave towards each other's side. A first sealing member and a second sealing member that match the shapes of the first concave part and the first annular groove are respectively provided in the first concave part and the first annular groove.

[0048] In this embodiment, in order to facilitate the fixation of the guide sleeve 3 and at the same time facilitate the gas to exert pressure on the main valve spool 2, for example, the outer shape of the guide sleeve 3 is a U-shaped structure. The open end of the U-shaped structure extends towards the main valve spool 2. There is an air hole on the closed end of the U-shaped structure that communicates with the fourth channel 11 (the gas coming out of the air hole exerts pressure on the piston to make the piston move leftward, that is, move towards the inlet side). Among them, the transition part of the inner side wall of the U-shaped structure to the closed end forms a limiting table surface.

[0049] In addition, the piston 5 includes a raised column and a guide column. To make the structure of the piston 5 stable, for example, the raised column and the guide column are integrally formed. To facilitate the contact between the piston 5 and the main valve spool 2 and at the same time facilitate the fixing of the main valve spring 4, for example, one end of the raised column extends toward the side of the main valve spool 2, and the other end is connected to one end of the guide column. The other end of the guide column is provided with a second concave portion for fixing one end of the main valve spring 4. One end of the main valve spring 4 is located in the second concave portion, and the other end abuts against the limiting table surface of the guide sleeve. When the main valve is opened and the pilot valve is closed, the medium at the inlet compresses the spool and the piston against the main valve spring, putting the main valve spring in a compressed state. The main valve spring can slow down the direct impact of the piston on the guide sleeve table surface; when the main valve is closed and the pilot valve is opened, the gas (the gas entering the large-diameter part of the first channel through the guide sleeve) and the main valve spring together exert a force on the piston toward the main spool, so that the spool reliably closes the inlet.

[0050] In addition, to prevent gas from leaking through the gap between the guide column and the guide sleeve 9, for example, a second annular groove is provided on the outer side of the guide column along the circumferential direction of the guide column. A third seal is provided in the second annular groove. The inner side of the third seal is arranged in the second annular groove, and the outer side of the third seal abuts against the inner wall of the guide sleeve.

[0051] To facilitate the installation and disassembly of the pilot valve and the main valve, for example, the pilot valve is fixed to the main valve through a lock nut on the outside of the main valve, and the axis of the pilot valve is perpendicular to the axis of the main valve. To facilitate the rapid discharge of the gas that pushes the piston 5 to move from the valve body, for example, a cylindrical rubber bowl 17 for exhausting gas is provided on the circumferential outer side of one end of the pilot valve close to the lock nut. When exhausting, the gas passes through the gas outlet of the fourth channel 11, the gas inlet of the fourth channel 11, the inner cavity of the accommodating part 9, and the inner cavity formed by the upper pilot valve push rod 13 and the lower pilot valve push rod 14 in sequence and then enters the rubber bowl 17 through the housing of the electromagnet assembly 12 (the housing is provided with a pore path communicating with the rubber bowl 17). The two sides of the rubber bowl 17 expand away from the axis side of the rubber bowl 17, so that the gas is discharged. To facilitate the discharge of the gas and prevent external gas from entering the valve body through the rubber bowl 17, for example, the rubber bowl 17 is a cylinder that gradually expands from the center to both sides.

[0052] In the same embodiment, when the pilot valve spool 16 contacts the bottom of the accommodating part 9, to buffer the pressure between the two, for example, a limiting table and a second guide spring are provided at one end of the pilot valve spool 16 away from the lower pilot valve push rod 14. Among them, both the limiting table and the second guide spring are located in the accommodating part 9. One end of the second guide spring abuts against the bottom of the accommodating part 9, and the other end abuts against the lower end surface of the limiting table.

[0053] In addition, the control solenoid valve of the present application further includes an exhaust valve. The exhaust valve includes an exhaust housing 18 and an exhaust valve seat 19. An exhaust hole 20 communicating with the first channel 7 is provided on the exhaust valve seat 19, and the exhaust housing 18 is located outside the valve body. The exhaust valve seat 19 is disposed inside the first channel 7 and between the main valve spool 2 and the piston 5. The exhaust valve seat 19 is used to discharge the gas entering the first channel 7 from the second channel 8 to the outside of the valve body through the exhaust housing 18 after passing through the inner cavity of the exhaust base 19.

[0054] In addition, in order to reduce the leakage of gas from the gap between the parts where the inner wall of the valve body 1 abuts and coincides with the exhaust valve seat 19, for example, a third annular groove and a fourth seal member matching the third annular groove are provided on the part where the inner wall of the valve body 1 abuts and coincides with the exhaust valve seat 19. The third annular groove is recessed on the inner wall of the valve body away from the exhaust valve seat 19. The inner side of the fourth seal member abuts against the outer wall of the exhaust valve seat 19, and the outer side of the fourth seal member is located in the third annular groove.

[0055] In this embodiment, in order to effectively fix the first guiding spring 15, for example, annular fixing grooves for fixing the first guiding spring 15 are provided at the ends of the upper pilot valve push rod 13 and the lower pilot valve push rod 14 close to each other. The annular fixing grooves can prevent the two ends of the first guiding spring 15 from having radial movement, which is beneficial for the first guiding spring 15 to apply all its elastic force on the upper pilot valve push rod 13 and the lower pilot valve push rod 14, enabling the upper pilot valve push rod 13 and the lower pilot valve push rod 14 to obtain a quick response.

[0056] In addition, the main valve spool 2 adopts a high-pressure impact-resistant composite spool design. The main valve spool 2 can achieve two-way sealing with the valve body 1 and the exhaust valve seat 19, which can meet both high-pressure working conditions and repeated movement impact working conditions, reduce the structural complexity, and can also reduce the product weight.

[0057] The rubber cup 17 is made of non-metallic material, which simplifies the product structure and reduces the product weight at the same time, meeting the design concept of lightweight for rocket engine products.

[0058] In the solenoid valve of the embodiment of the present application, the main path medium flow (along the axial direction of the first channel) direction is consistent with the movement direction of the main valve spool. By reducing the number of dynamic seal O-rings (a seal formed by the cooperation of the third seal member and the second annular groove on the piston), the friction between the piston and the guide sleeve is reduced, and the valve responds faster during repeated movement, ensuring that the downstream propellant control valve opens and closes on time, and improving the working reliability of the engine.

[0059] The pilot valve is a pilot-operated solenoid valve. The electromagnet assembly 12 is designed in a generalized manner. The electromagnet assembly 12 and the main valve body are connected by left and right nuts (lock nuts). During the assembly process, the installation direction of the electromagnet assembly can be freely rotated, facilitating the application of the product to various spatial structures. At the same time, when the main valve is in good performance, the electromagnet assembly can be quickly replaced without affecting the performance of the whole valve. In addition, the electromagnet assembly 12 is also suitable for being used in combination with the main valves of other products.

[0060] As Figure 1 shown, when the backpressure chamber of the main valve spool 2 is high-pressure gas, the piston 5 pushes the main valve spool 2 to move leftward, and the valve body 1 and the main valve spool 2 achieve sealing, and the inlet-outlet channel (the first channel intakes air and the second channel discharges air) is closed; conversely, the main valve spool 2 moves rightward, and the main valve spool 2 and the exhaust valve seat 19 achieve sealing, and the inlet-outlet channel is opened.

[0061] In addition, when the main valve spool 2 moves leftward, the valve body 1 and the main valve spool 2 achieve sealing, the inlet-outlet channel is closed, and the outlet-exhaust port channel (the first channel is connected through the exhaust port, and the gas is discharged from the first channel through the exhaust port) is opened; conversely, when the main valve spool 2 moves rightward, the main valve spool 2 and the exhaust valve seat 19 achieve sealing, the inlet-outlet channel is opened, and the outlet-exhaust port channel is closed.

[0062] As Figure 1 shown, when the electromagnet assembly 12 is powered off, the pilot valve spool 16 moves upward under the action of the spring force (the elastic force of the second spring), and the lower valve seat is opened (the lower end surface of the pilot valve 2 is separated from the inner lower surface of the accommodating part 9, and the upper end surface of the pilot valve spool 16 is in contact with the inner upper surface of the accommodating part 9), and the inlet high-pressure gas communicates with the backpressure chamber of the main valve spool 2 (the part between the piston and the guide sleeve). When the electromagnet is powered on, the pilot valve spool moves downward, and the upper valve seat is opened (the lower end surface of the pilot valve spool 16 is in contact with the inner lower surface of the accommodating part 9, and the upper end surface of the pilot valve spool 16 is separated from the inner upper surface of the accommodating part 9), cutting off the connection between the inlet high-pressure gas and the backpressure chamber of the main valve spool. The gas in the backpressure chamber of the main valve spool sequentially passes through the air outlet of the fourth channel 11, the air inlet of the fourth channel 11, the accommodating cavity 9, the inner cavity formed by the upper pilot valve push rod and the lower pilot valve push rod, and then enters the rubber bowl 17 through the shell of the electromagnet assembly (the shell is provided with a pore path communicating with the rubber bowl 17). The rubber bowl 17 is stressed and expands on both sides away from the axis of the rubber bowl 17, thereby discharging the gas.

[0063] The above is only a schematic specific embodiment of the present invention. Without departing from the concept and principle of the present invention, any equivalent changes and modifications made by any person skilled in the art shall fall within the scope of protection of the present invention.

Claims

1. A control solenoid valve, characterized in that , including main valve and pilot valve, The main valve comprises a valve body, a main valve core, a guide sleeve, a main valve spring, a piston and an end cover. The valve body has a first channel for gas circulation and a second channel connected to the first channel and extending in a different direction. The first channel includes a large diameter portion and a small diameter portion. The main valve core, the guide sleeve, the main valve spring and the piston are all located in the large diameter portion. The end cover is located at one end of the valve body. An accommodating portion and a third channel and a fourth channel connected to the accommodating portion are provided at a portion of the valve body radially away from the first channel; an air inlet of the third channel is communicated with an air inlet end of the first channel located at a small diameter portion, an air outlet of the third channel is communicated with an air inlet end of the accommodating portion, an air outlet end of the accommodating portion is communicated with an air inlet of the fourth channel, and an air outlet of the fourth channel is communicated with an air hole on the guide sleeve; The pilot valve comprises an electromagnet assembly, an upper pilot valve push rod, a lower pilot valve push rod, a first guide spring, and a pilot valve spool; the upper pilot valve push rod and the lower pilot valve push rod are both located inside the electromagnet assembly, the lower end of the upper pilot valve push rod is connected to the upper end of the first guide spring, the lower end of the first guide spring is connected to the upper end of the lower pilot valve push rod, and the lower end of the lower pilot valve push rod is used to connect to the pilot valve spool; the pilot valve spool is located in the accommodating portion, and the pilot valve spool is controlled to move up and down by turning the electromagnet assembly on and off to connect or close the third channel and the fourth channel; When the pilot valve is opened, the gas medium passes through the third channel, the accommodating portion, the fourth channel, and the air hole in sequence through the air inlet end of the small diameter portion, and then pushes the piston to move to the side away from the end cover to drive the main valve spool to move along the axial direction of the first channel, so that one end of the main valve spool abuts against the transition portion from the large diameter portion to the small diameter portion, thereby completing the closing of the main valve.

2. The control solenoid valve according to claim 1, characterized in that , along the axial direction of the first channel, the two ends of the main valve core are respectively provided with a first recessed portion and a first annular groove that are recessed toward each other, and the first recessed portion and the first annular groove are respectively provided with a first seal and a second seal that match the shape of the first recessed portion and the first annular groove.

3. The control solenoid valve according to claim 1, characterized in that The guide sleeve has a U-shaped structure, the open end of the U-shaped structure extends toward the side of the main valve core, and the closed end of the U-shaped structure is provided with the air hole connected to the fourth channel, wherein the transition part from the inner side wall of the U-shaped structure to the closed end forms a limit table for limiting the movement of the piston sleeve.

4. The control solenoid valve according to claim 1, characterized in that The piston includes a raised column and a guide column that are integrally formed. One end of the raised column extends toward the side of the main valve core, and the other end is connected to one end of the guide column. The other end of the guide column is provided with a second recessed portion for fixing one end of the main valve spring.

5. The control solenoid valve according to claim 4, characterized in that A second annular groove is provided on the guide column along the circumferential outer side of the guide column, a third sealing member is provided in the second annular groove, the inner side of the third sealing member is arranged in the second annular groove, and the outer side of the third sealing member abuts against the inner wall of the guide sleeve.

6. The control solenoid valve according to claim 1, characterized in that The pilot valve is fixed to the main valve on the outside of the main valve through a locking nut, and the axis of the pilot valve is perpendicular to the axis of the main valve; a cylindrical rubber bowl for exhaust is provided on the circumferential outside of one end of the pilot valve close to the locking nut.

7. The control solenoid valve according to claim 1, characterized in that A limit platform and a second guide spring are provided at one end of the pilot valve core away from the lower pilot valve push rod, wherein the limit platform and the second guide spring are both located in the accommodating portion, one end of the second guide spring abuts against the bottom of the accommodating portion, and the other end abuts against the lower end surface of the limit platform.

8. The control solenoid valve according to claim 1, characterized in that , also includes an exhaust valve, which includes an exhaust housing and an exhaust valve seat, the exhaust valve seat is provided with an exhaust hole connected to the first channel, the exhaust housing is located on the outside of the valve body, the exhaust valve seat is arranged inside the first channel and is located between the main valve core and the piston, the exhaust valve seat is used to discharge the gas entering the first channel from the second channel through the inner cavity of the exhaust base through the exhaust housing to the outside of the valve body.

9. The control solenoid valve according to claim 8, characterized in that A third annular groove and a fourth sealing member matching the third annular groove are provided at the portion where the inner wall of the valve body abuts and overlaps with the exhaust valve seat. The third annular groove is recessed along the inner wall of the valve body toward the side away from the exhaust valve seat. The inner side of the fourth sealing member abuts against the outer wall of the exhaust valve seat, and the outer side of the fourth sealing member is located in the third annular groove.

10. The control solenoid valve according to claim 1, characterized in that The upper pilot valve push rod and the lower pilot valve push rod are respectively provided with an annular fixing groove for fixing the first guide spring at their ends close to each other.

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