Two-position four-way electromagnetic valve

Abstract

The utility model relates to the technical field of electromagnetic valves, and discloses a two-position four-way electromagnetic valve which comprises a valve body, a first valve element and a second valve element, the first valve element and the second valve element are each provided with a hollow portion with the upper end and the lower end communicated, and the valve body is provided with a first valve cavity, a second valve cavity, an air inlet, a first working opening, a second working opening and an exhaust opening. The first valve cavity comprises a first sliding cavity, a first piston cavity and a first communicating cavity which are communicated with one another, the first sliding cavity is communicated with the air inlet, the first communicating cavity is communicated with the first working port, and the first valve element comprises a first upper valve rod, a first piston part and a first lower valve rod which are sequentially arranged; the first upper valve rod is in sliding fit with the first sliding cavity, and the first piston part is in sliding fit with the first piston cavity; according to the two-position four-way electromagnetic valve, the problem that the coil power, the working pressure and the flow of an existing two-position four-way valve cannot be obtained at the same time is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to solenoid valve technical field, concretely relates to a two-position four-way solenoid valve. BACKGROUND

[0002] The valve core action of the existing two-position four-way valve must overcome the medium pressure whether it is direct-acting or pilot, and the valve core action resistance is increased. In the case of large differential pressure, in order to ensure the normal work of the valve, the power of starting is increased, but it will cause the service life of the device to be greatly reduced, or the flow capacity is limited by sacrificing the valve core stroke, which causes the coil power, the working pressure and the flow of the valve to be unable to be obtained at the same time. SUMMARY

[0003] The utility model discloses a two-position four-way solenoid valve, which aims to solve at least one of the above problems in the prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A two-position four-way solenoid valve, comprising a valve body, a first valve core and a second valve core, the first valve core and the second valve core both have a hollow part with upper and lower ends being communicated, the valve body is provided with a first valve cavity, a second valve cavity, an air inlet, a first working port, a second working port and an air outlet;

[0006] The first valve cavity comprises a first sliding cavity, a first piston cavity and a first communication cavity which are communicated with each other, the first sliding cavity is communicated with the air inlet, the first communication cavity is communicated with the first working port, the first valve core comprises a first upper valve rod, a first piston part and a first lower valve rod which are arranged in sequence, the first upper valve rod is in sliding fit with the first sliding cavity, the first piston part is in sliding fit with the first piston cavity, the first lower valve rod is located in the first communication cavity, a first spring is sleeved on the first lower valve rod, and the first spring is arranged between the first piston part and the lower end wall of the first communication cavity;

[0007] The second valve cavity comprises a second sliding cavity, a second piston cavity and a second communication cavity which are communicated with each other, the second sliding cavity is communicated with the air outlet, the second communication cavity is communicated with the second working port, the second valve core comprises a second lower valve rod, a second piston part and a second upper valve rod which are arranged in sequence, the second lower valve rod is in sliding fit with the second sliding cavity, the second piston part is in sliding fit with the second piston cavity, the second upper valve rod is located in the second communication cavity, a second spring is sleeved on the second upper valve rod, and the second spring is arranged between the second piston part and the upper end wall of the second communication cavity;

[0008] The upper communication hole is arranged between the first sliding cavity and the second communication cavity, the middle communication hole is arranged between the high-pressure cavity of the first piston cavity and the high-pressure cavity of the second piston cavity, and the lower communication hole is arranged between the first communication cavity and the second sliding cavity.

[0009] The first valve core and the second valve core are hollow structures, the hollow part of the two valve cores is a gas path, the first valve core comprises a first upper valve rod, a first piston part and a first lower valve rod arranged in sequence, the second valve core comprises a second lower valve rod, a second piston part and a second upper valve rod arranged in sequence, the piston part and the gas path are integrated on the first valve core and the second valve core as a whole, compared with the existing solid valve core with a gas path around the valve core, the hollow valve core has a larger diameter, a stronger conduction capacity, a simple internal gas path, a small resistance to gas, a small medium resistance to valve core movement and a faster response. The design has smaller movement resistance and a faster response, reduces the spring force for sealing and resetting, transfers the force borne by the spring to the valve core wall, and achieves a balance between the coil power, the working pressure and the flow of the valve. The piston, the valve core, the piston cavity and the gas path are integrated, the space is used efficiently, the volume of the valve body is reduced, the material cost is reduced, and the structure is simple and convenient to process. The electromagnetic valve has a simple and reliable structure, is convenient to install and maintain, has a small size and can work for a long time. The first working port and the second working port can be supplied with gas in the case of power-off and power-on.

[0010] Further, in order to provide a pilot structure, the valve body is provided with a pilot magnetic head mounting position, a pilot inlet gas path and a pilot outlet gas path, the pilot magnetic head mounting position is connected with a pilot electromagnetic head (not shown in the figure), two ends of the pilot inlet gas path are respectively communicated with the inlet and the pilot magnetic head mounting position, and two ends of the pilot outlet gas path are respectively communicated with the pilot magnetic head mounting position and the first piston cavity.

[0011] Further, the upper sealing structure and the lower sealing structure are arranged between the two ends of the first valve core and the valve body and between the two ends of the second valve core and the valve body. When the high-pressure inlet is connected with the first working port and the second working port, the inlet can be self-sealed, and the sealing performance is enhanced to prevent leakage.

[0012] Further, in order to achieve a high sealing effect, the upper sealing structure and the lower sealing structure each comprise a sealing gasket groove, and a sealing gasket is arranged in the sealing gasket groove.

[0013] Furthermore, to increase the reliability of the end face seal, both the upper and lower sealing structures include an upper sealing ring and a lower sealing ring with a triangular cross-section. The upper and lower sealing rings are respectively disposed at both ends of the first valve chamber and the second valve chamber, and the upper and lower sealing rings are respectively mated with the corresponding sealing gaskets.

[0014] Furthermore, in order to facilitate the installation of the second valve core, the second spring and the valve body, and to facilitate the forming of the pilot air intake path and the pilot air exhaust path, the upper end of the valve body is provided with an upper mounting groove, the second valve cavity is connected to the upper mounting groove, a pilot upper cover is installed in the upper mounting groove, and the second spring is disposed between the pilot upper cover and the second piston part.

[0015] The pilot air intake path includes a first air intake path and a second air intake path that are interconnected. The pilot magnetic head mounting position and the first air intake path are both formed on the pilot upper cover. The first air intake path is connected to the pilot magnetic head mounting position. The second air intake path is formed on the valve body and is connected to the air inlet.

[0016] Furthermore, to improve the sealing performance between the pilot cover and the second valve chamber, the pilot air intake path, and the pilot air outlet path, the upper mounting groove is provided with a first sealing ring groove, a second sealing ring groove, and a third sealing ring groove. The first sealing ring groove is coaxially arranged around the second air intake path, and a first sealing ring is provided in the first sealing ring groove. The second sealing ring groove is coaxially arranged around the pilot air outlet path, and a second sealing ring is provided in the second sealing ring groove. The third sealing ring groove is coaxially arranged around the second valve chamber, and a third sealing ring is provided in the third sealing ring groove.

[0017] Furthermore, to facilitate the installation of the first valve core, the first spring, and the valve body, a lower mounting groove is provided at the lower end of the valve body. The lower end of the first valve cavity is connected to the lower mounting groove. A lower cover is installed in the lower mounting groove, and the first spring is disposed between the lower cover and the first piston portion.

[0018] Furthermore, in order to improve the sliding sealing effect between the piston part and the piston chamber, the outer periphery of the first piston part and the second piston part is provided with a piston sealing ring groove, and a piston sealing ring is provided in the piston sealing ring groove.

[0019] Furthermore, in order to improve the sliding sealing effect between the valve stem and the sliding cavity, valve stem grooves are provided on the outer periphery of both the first upper valve stem and the second lower valve stem, and valve stem sealing rings are provided in the valve stem grooves.

[0020] The beneficial effects of this utility model are as follows: Traditional valve cores are all solid structures with a small air passage between the solid valve core and the valve body. In this technical solution, both the first and second valve cores have hollow sections connected at their upper and lower ends. Both valve cores are designed as hollow structures, with the hollow section serving as the air passage. The first valve core includes a first upper valve stem, a first piston section, and a first lower valve stem arranged in sequence, and the second valve core includes a second lower valve stem, a second piston section, and a second upper valve stem arranged in sequence. The piston section and air passage are integrated integrally into the first and second valve cores. Compared with the existing solid valve core design with air passages around it, the hollow valve core of this technical solution has a larger diameter, stronger conductivity, and a simpler internal air passage, resulting in less resistance to gas and less resistance to the medium during valve core movement, leading to a faster response. This design has lower movement resistance, faster response, and reduces the spring force used for sealing and resetting, transferring the force that the spring should bear to the valve core tube wall, thus achieving a balance between coil power, valve working pressure, and flow rate. This technical solution integrates the piston, valve core, piston chamber, and air passage, making efficient use of space, reducing valve body volume, lowering material costs, and offering a simple structure and easy processing. The solenoid valve in this solution employs a simple and reliable structure, making it easy to install, maintain, and operate for extended periods. It can supply air to both the first and second working ports simultaneously, regardless of whether power is on or off. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a top view of the structure of this utility model;

[0023] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at point AA;

[0024] Figure 4 for Figure 3 A magnified schematic diagram of the partial structure at point A in the middle;

[0025] Figure 5 for Figure 2 Schematic diagram of the cross-sectional structure at point BB;

[0026] Figure 6 This is a cross-sectional view of the valve body in this utility model;

[0027] Figure 7 This is a schematic diagram of the structure of the first valve core and the second valve core in this utility model;

[0028] Figure 8 This is a schematic diagram of the structure in which the air inlet and the second working port are connected in this utility model;

[0029] In the diagram: Valve body 1; First valve core 2; First upper valve stem 2.1; First piston part 2.2; First lower valve stem 2.3; Second valve core 3; Second lower valve stem 3.1; Second piston part 3.2; Second upper valve stem 3.3; Hollow part 4; Air inlet 5; First working port 6; Second working port 7; Exhaust port 8; First sliding chamber 9; First piston chamber 10; First connecting chamber 11; First spring 12; Second sliding chamber 13; Second piston chamber 14; Second connecting chamber 15; Second spring 16; Upper 17. Middle connecting hole; 18. High pressure chamber; 19. Lower connecting hole; 20. Pilot head mounting position; 21. Pilot air inlet passage; 22. First air inlet passage; 22.1. Second air inlet passage; 22.2. Pilot exhaust passage; 23. Sealing gasket groove; 24. Upper sealing ring; 25. Lower sealing ring; 26. Upper mounting groove; 27. Pilot upper cover; 28. First sealing ring groove; 29. ​​Second sealing ring groove; 30. Lower mounting groove; 31. Lower cover; 32. Piston sealing ring groove; 33. Valve stem groove; 34. Third sealing ring groove; 35. Detailed Implementation

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is used to help understand this utility model, but does not constitute a limitation on this utility model.

[0031] Example 1:

[0032] like Figures 1-8 As shown, this embodiment provides a two-position four-way solenoid valve, including a valve body 1, a first valve core 2 and a second valve core 3. Both the first valve core 2 and the second valve core 3 have a hollow part 4 with the upper and lower ends connected. The valve body 1 is provided with a first valve chamber, a second valve chamber, an air inlet 5, a first working port 6, a second working port 7 and an exhaust port 8.

[0033] The first valve chamber includes a first sliding chamber 9, a first piston chamber 10, and a first connecting chamber 11 that are interconnected. The first sliding chamber 9 is connected to the air inlet 5, and the first connecting chamber 11 is connected to the first working port 6. The first valve core 2 includes a first upper valve stem 2.1, a first piston part 2.2, and a first lower valve stem 2.3 arranged sequentially. The first upper valve stem 2.1 is slidably engaged with the first sliding chamber 9, the first piston part 2.2 is slidably engaged with the first piston chamber 10, and the first lower valve stem 2.3 is located in the first connecting chamber 11. A first spring 12 is sleeved on the first lower valve stem 2.3, and the first spring 12 is disposed between the first piston part 2.2 and the lower end wall of the first connecting chamber 11.

[0034] The second valve chamber includes a second sliding chamber 13, a second piston chamber 14, and a second connecting chamber 15 that are interconnected. The second sliding chamber 13 is connected to the exhaust port 8, and the second connecting chamber 15 is connected to the second working port 7. The second valve core 3 includes a second lower valve stem 3.1, a second piston part 3.2, and a second upper valve stem 3.3 arranged sequentially. The second lower valve stem 3.1 is slidably engaged with the second sliding chamber 13, and the second piston part 3.2 is slidably engaged with the second piston chamber 14. The second upper valve stem 3.3 is located in the second connecting chamber 15, and a second spring 16 is sleeved on the second upper valve stem 3.3. The second spring 16 is disposed between the second piston part 3.2 and the upper end wall of the second connecting chamber 15.

[0035] An upper connecting hole 17 is provided between the first sliding cavity 9 and the second connecting cavity 15, a middle connecting hole 18 is provided between the high pressure cavity 19 of the first piston cavity 10 and the second piston cavity 14, and a lower connecting hole 20 is provided between the first connecting cavity 11 and the second sliding cavity 13.

[0036] Traditional valve cores are solid structures with a small air passage between the solid valve core and the valve body 1. In this technical solution, both the first valve core 2 and the second valve core 3 have a hollow section 4 with the upper and lower ends connected. Both valve cores are designed as hollow structures, with the hollow section 4 serving as the air passage. The first valve core 2 includes a first upper valve stem 2.1, a first piston section 2.2, and a first lower valve stem 2.3 arranged in sequence. The second valve core 3 includes a second lower valve stem 3.1, a second piston section 3.2, and a second upper valve stem 3.3 arranged in sequence. The piston section and air passage are integrated into the first valve core 2 and the second valve core 3. Compared with the existing solid valve core design with air passages around it, the hollow valve core of this technical solution has a larger air passage, stronger conductivity, a simpler internal air passage, less resistance to gas, less resistance to medium movement, and a faster response. This design features lower motion resistance and faster response, reducing the spring force required for sealing and resetting, thus transferring the force that the spring should bear to the valve core wall. This achieves a balance between coil power, valve operating pressure, and flow rate. This technical solution integrates the piston, valve core, piston chamber, and air passage, efficiently utilizing space, reducing valve body size, lowering material costs, and offering a simple structure and easy manufacturing. The solenoid valve in this technical solution adopts a simple and reliable structure, making it easy to install, maintain, and operate for extended periods. It can supply air to both the first working port 6 and the second working port 7, regardless of whether power is supplied or not.

[0037] Example 2:

[0038] This embodiment is an optimization based on the above embodiment 1.

[0039] To provide a pilot structure that facilitates the driving of the valve core without increasing the power of the electromagnet, the valve body 1 is provided with a pilot magnetic head mounting position 21, a pilot air inlet passage 22, and a pilot air outlet passage 23. The valve body 1 is connected to the pilot electromagnetic head (not shown in the figure) through the pilot magnetic head mounting position 21. The two ends of the pilot air inlet passage 22 are respectively connected to the air inlet 5 and the pilot magnetic head mounting position 21. The two ends of the pilot air outlet passage 23 are respectively connected to the pilot magnetic head mounting position 21 and the first piston chamber 10.

[0040] Example 3:

[0041] This embodiment is an optimization based on the above embodiment 1.

[0042] Both ends of the first valve core 2 and the valve body 1 are provided with upper sealing structures and lower sealing structures, respectively. When the high-pressure air inlet 5 is connected to the first working port 6 and the second working port 7, it can self-seal, enhancing the sealing performance and preventing leakage.

[0043] Example 4:

[0044] This embodiment is an optimization based on the above embodiment 3.

[0045] To achieve a high sealing effect, both the upper and lower sealing structures include a sealing gasket groove 24, and a sealing gasket (not shown in the figure) is provided in the sealing gasket groove 24.

[0046] Example 5:

[0047] This embodiment is an optimization based on the above embodiment 4.

[0048] To increase the reliability of the end face seal, both the upper and lower sealing structures include an upper sealing ring 25 and a lower sealing ring 26 with a triangular cross-section. The upper sealing ring 25 and the lower sealing ring 26 are respectively disposed at both ends of the first valve chamber and the second valve chamber, and the upper sealing ring 25 and the lower sealing ring 26 are respectively mated with the corresponding sealing gasket (not shown in the figure).

[0049] Example 6:

[0050] This embodiment is an optimization based on the above embodiment 2.

[0051] To facilitate the installation of the second valve core 3, the second spring 16 and the valve body 1, and to facilitate the forming of the pilot air intake passage 22 and the pilot air outlet passage 23, the upper end of the valve body 1 is provided with an upper mounting groove 27. The second valve cavity is connected to the upper mounting groove 27. A pilot upper cover 28 is installed in the upper mounting groove 27. The second spring 16 is located between the pilot upper cover 28 and the second piston part 3.2.

[0052] The pilot air intake passage 22 includes a first air intake passage 22.1 and a second air intake passage 22.2 that are interconnected. The pilot magnetic head mounting position 21 and the first air intake passage 22.1 are both formed on the pilot upper cover 28. The first air intake passage 22.1 is connected to the pilot magnetic head mounting position 21. The second air intake passage 22.2 is formed on the valve body 1 and is connected to the air intake port 5.

[0053] Example 7:

[0054] This embodiment is an optimization based on the above embodiment 6.

[0055] To improve the sealing performance between the pilot cover and the second valve chamber, the pilot air intake passage 22, and the pilot air outlet passage 23, the upper mounting groove 27 is provided with a first sealing ring groove 29, a second sealing ring groove 30, and a third sealing ring groove 35. The first sealing ring groove 29 is coaxially arranged around the second air intake passage 22.2, and a first sealing ring (not shown in the figure) is provided in the first sealing ring groove 29; the second sealing ring groove 30 is coaxially arranged around the pilot air outlet passage 23, and a second sealing ring (not shown in the figure) is provided in the second sealing ring groove 30; the third sealing ring groove 35 is coaxially arranged around the second valve chamber, and a third sealing ring (not shown in the figure) is provided in the third sealing ring groove 35.

[0056] Example 8:

[0057] This embodiment is an optimization based on the above embodiment 1.

[0058] To facilitate the installation of the first valve core 2, the first spring 12 and the valve body 1, the lower end of the valve body 1 is provided with a lower mounting groove 31. The lower end of the first valve cavity is connected to the lower mounting groove 31. A lower cover 32 is installed in the lower mounting groove 31. The first spring 12 is located between the lower cover 32 and the first piston part 2.2.

[0059] Example 9:

[0060] This embodiment is an optimization based on the above embodiment 1.

[0061] To improve the sliding sealing effect between the piston part and the piston chamber, the outer periphery of the first piston part 2.2 and the second piston part 3.2 is provided with a piston sealing ring groove 33, and a piston sealing ring (not shown in the figure) is provided in the piston sealing ring groove 33.

[0062] Example 10:

[0063] This embodiment is an optimization based on the above embodiment 1.

[0064] To improve the sliding seal between the valve stem and the sliding cavity, valve stem grooves 34 are provided on the outer periphery of the first upper valve stem 2.1 and the second lower valve stem 3.1, and valve stem sealing rings (not shown in the figure) are provided in the valve stem grooves 34.

[0065] Working principle: When the coil of the pilot solenoid head is de-energized, the moving iron core of the pilot solenoid head descends, sealing the crater at the mounting point of the pilot solenoid head. The pilot air intake passage 22 and the pilot air outlet passage 23 are disconnected. The high-pressure chamber 19 of the first piston chamber 10 is disconnected from the air inlet 5. Under the action of the first spring 12 and the second spring 16, the medium in the high-pressure chamber 19 of the first piston chamber 10 and the second piston chamber 14 is discharged to the atmosphere through the vent of the pilot solenoid head. The first valve core 2 and the second valve core 3 remain in their initial state. Figure 3 As shown, its air inlet 5 is connected to the first working port 6; when the coil of the pilot electromagnetic head is energized, the moving iron core of the pilot electromagnetic head is raised, and the pilot air inlet passage 22 and the pilot air outlet passage 23 are connected. The medium passes through the air inlet 5, the pilot air inlet passage 22 and the pilot air outlet passage 23 in sequence to reach the high-pressure chamber 19 of the first piston chamber 10. Since the high-pressure chamber 19 of the first piston chamber 10 and the second piston chamber 14 is connected through the middle connecting hole 18, the medium in the high-pressure chamber 19 will push the first valve core 2 and the second valve core 3 to move in opposite directions respectively, such as Figure 8 As shown, the air inlet 5 is connected to the second working port 7.

[0066] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A two-position four-way solenoid valve, characterized in that: It includes a valve body, a first valve core and a second valve core, both of which have a hollow portion with the upper and lower ends connected. The valve body is provided with a first valve chamber, a second valve chamber, an air inlet, a first working port, a second working port and an exhaust port. The first valve chamber includes a first sliding chamber, a first piston chamber, and a first connecting chamber that are interconnected. The first sliding chamber is connected to the air inlet, and the first connecting chamber is connected to the first working port. The first valve core includes a first upper valve stem, a first piston part, and a first lower valve stem arranged in sequence. The first upper valve stem is slidably engaged with the first sliding chamber, and the first piston part is slidably engaged with the first piston chamber. The first lower valve stem is located in the first connecting chamber, and a first spring is sleeved on the first lower valve stem. The first spring is disposed between the first piston part and the lower end wall of the first connecting chamber. The second valve chamber includes a second sliding chamber, a second piston chamber, and a second connecting chamber that are interconnected. The second sliding chamber is connected to the exhaust port, and the second connecting chamber is connected to the second working port. The second valve core includes a second lower valve stem, a second piston part, and a second upper valve stem arranged in sequence. The second lower valve stem is slidably engaged with the second sliding chamber, and the second piston part is slidably engaged with the second piston chamber. The second upper valve stem is located in the second connecting chamber, and a second spring is sleeved on the second upper valve stem. The second spring is disposed between the second piston part and the upper end wall of the second connecting chamber. An upper connecting hole is provided between the first sliding cavity and the second connecting cavity, a middle connecting hole is provided between the high-pressure chambers of the first piston cavity and the second piston cavity, and a lower connecting hole is provided between the first connecting cavity and the second sliding cavity.

2. A two-position four-way solenoid valve according to claim 1, characterized in that: The valve body is provided with a pilot magnetic head mounting position, a pilot air intake passage and a pilot air outlet passage. The two ends of the pilot air intake passage are respectively connected to the air inlet and the pilot magnetic head mounting position, and the two ends of the pilot air outlet passage are respectively connected to the pilot magnetic head mounting position and the first piston chamber.

3. A two-position four-way solenoid valve according to claim 1, characterized in that: The first valve core has an upper sealing structure and a lower sealing structure between its two ends and the valve body, and the second valve core has an upper sealing structure and a lower sealing structure between its two ends and the valve body.

4. A two-position four-way solenoid valve according to claim 3, characterized in that: Both the upper sealing structure and the lower sealing structure include a sealing gasket groove, and a sealing gasket is provided in the sealing gasket groove.

5. A two-position four-way solenoid valve according to claim 4, characterized in that: Both the upper and lower sealing structures include an upper sealing ring and a lower sealing ring with a triangular cross-section. The upper and lower sealing rings are respectively disposed at both ends of the first valve chamber and the second valve chamber, and the upper and lower sealing rings are respectively connected to the corresponding sealing gaskets.

6. A two-position four-way solenoid valve according to claim 2, characterized in that: The upper end of the valve body is provided with an upper mounting groove, the second valve chamber is connected to the upper mounting groove, a pilot cover is installed in the upper mounting groove, and the second spring is disposed between the pilot cover and the second piston. The pilot air intake path includes a first air intake path and a second air intake path that are interconnected. The pilot magnetic head mounting position and the first air intake path are both formed on the pilot upper cover. The first air intake path is connected to the pilot magnetic head mounting position. The second air intake path is formed on the valve body and is connected to the air inlet.

7. A two-position four-way solenoid valve according to claim 6, characterized in that: The upper mounting groove is provided with a first sealing ring groove, a second sealing ring groove and a third sealing ring groove. The first sealing ring groove is coaxially arranged around the second air intake passage and contains a first sealing ring. The second sealing ring groove is coaxially arranged around the first air outlet passage and contains a second sealing ring. The third sealing ring groove is coaxially arranged around the second valve cavity and contains a third sealing ring.

8. A two-position four-way solenoid valve according to claim 1, characterized in that: The lower end of the valve body is provided with a lower mounting groove, the lower end of the first valve cavity is connected to the lower mounting groove, a lower cover is installed in the lower mounting groove, and the first spring is disposed between the lower cover and the first piston part.

9. A two-position four-way solenoid valve according to claim 1, characterized in that: The outer periphery of the first piston portion and the second piston portion is provided with a piston sealing ring groove, and a piston sealing ring is provided in the piston sealing ring groove.

10. A two-position four-way solenoid valve according to claim 1, characterized in that: Both the first upper valve stem and the second lower valve stem have valve stem grooves on their outer periphery, and valve stem sealing rings are provided in the valve stem grooves.

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