A bidirectional pilot-operated solenoid valve

Abstract

This invention discloses a bidirectional pilot-operated solenoid valve comprising: a valve body having a first inflow port and a second outflow port, and a main valve seat and a main valve chamber formed between the first and second ports; a main valve core dividing the main valve chamber into a pilot chamber and a guide chamber; a first inflow channel, a first outflow channel, a second inflow channel, and a second outflow channel; and a secondary valve core for synchronously opening and closing the first and second outflow channels. When the secondary valve core is closed, the pilot chamber introduces high-pressure side pressure through the first or second inflow channel, pushing the main valve core to contact the main valve seat, thereby closing the guide chamber. When the secondary valve core is open, the pilot chamber releases pressure to the low-pressure side through the first or second outflow channel, and the main valve core is pushed upward by the fluid to separate from the main valve seat, thereby opening the guide chamber. This invention solves the problem that traditional pilot-operated solenoid valves are difficult to use in bidirectional flow paths.

Description

Technical Field

[0001] This invention relates to the field of solenoid valves, and more specifically to a bidirectional pilot-operated solenoid valve. Background Technology

[0002] A pilot valve is a component that controls a device by adjusting the pressure or flow of fluid. It is widely used in industrial automation, automotive braking, and hydraulic systems.

[0003] Traditional pilot-operated solenoid valves have an inflow channel that introduces pressure from the primary pressure side into the pilot chamber and an outflow channel that releases pressure from the pilot chamber to the secondary pressure side. They are also equipped with a secondary valve to control the opening and closing of the outflow channel. Therefore, although traditional pilot-operated solenoid valves can seal the flow on the primary pressure side, they cannot seal the reverse flow from the secondary pressure side. In bidirectional flow paths, the use of pilot valves is limited. Summary of the Invention

[0004] To overcome the above-mentioned shortcomings, the present invention aims to provide a bidirectional pilot-operated solenoid valve.

[0005] To achieve the above objectives, the technical solution adopted by the present invention includes:

[0006] The valve body has a first port for fluid inflow and a second port for fluid outflow, as well as a main valve seat and a main valve chamber formed between the first port and the second port; the main valve core divides the main valve chamber into a pilot chamber and a guide chamber, and is capable of contacting or separating the main valve seat to control the opening and closing of the guide chamber; A first inflow channel and a first outflow channel, the first inflow channel allowing fluid in the first port to flow to the pilot chamber, the first outflow channel allowing fluid in the pilot chamber to flow to the second port; a second inflow channel and a second outflow channel, the second inflow channel allowing fluid in the second port to flow to the pilot chamber, the second outflow channel allowing fluid in the pilot chamber to flow to the first port; The secondary valve core is used to synchronize the opening and closing of the first and second outflow channels. When the secondary valve core is closed, the pilot chamber introduces high-pressure side pressure through the first or second inflow channel, pushing the main valve core to contact the main valve seat, thereby closing the guide chamber. When the secondary valve core is open, the pilot chamber releases pressure to the low-pressure side through the first or second outflow channel, and the main valve core is pushed upward by the fluid to separate from the main valve seat, thereby opening the guide chamber.

[0007] This application addresses the two flow directions of fluid by incorporating a first flow channel and a second flow channel within the valve body. This allows the valve to reliably open or seal when the fluid flows in either the forward or reverse direction, overcoming the limitation of traditional pilot valves that can only seal in one direction. Furthermore, this application utilizes only the auxiliary valve core to control the synchronous opening and closing of the first and second outflow channels, thereby controlling the valve's opening or sealing. This approach features high response efficiency and low energy consumption.

[0008] In the preferred embodiment of the bidirectional pilot-operated solenoid valve described above, the first inflow channel and the second inflow channel are interconnected and connected to the pilot chamber through the first confluence channel.

[0009] In the preferred embodiment of the above-mentioned bidirectional pilot-operated solenoid valve, the first outflow channel is connected to the second outflow channel and is connected to the first confluence channel through the second confluence channel. The auxiliary valve core controls the synchronous opening and closing of the first outflow channel and the second outflow channel by controlling the opening and closing of the second confluence channel.

[0010] In the preferred embodiment of the above-mentioned bidirectional pilot-operated solenoid valve, a first check valve is provided in the first inflow channel, and a second check valve is provided in the first outflow channel.

[0011] In the preferred embodiment of the above-mentioned bidirectional pilot-operated solenoid valve, a third check valve is provided in the second inflow channel, and a fourth check valve is provided in the second outflow channel.

[0012] In the preferred embodiment of the above-mentioned bidirectional pilot-operated solenoid valve, the check valve is one of an umbrella-shaped check valve, a swing check valve, or a ball check valve.

[0013] In the preferred embodiment of the above-mentioned bidirectional pilot-operated solenoid valve, the main valve core includes a sleeve portion nested in the main valve chamber, a diaphragm fixed by the sleeve portion to separate the main valve chamber, and an elastic member disposed in the inner cavity of the sleeve portion to press against the back of the diaphragm; wherein, an annular groove is provided on the side of the sleeve portion, the annular groove is connected to the inner cavity of the sleeve portion through at least one air hole, and the first inflow channel and the second inflow channel are connected to the inner cavity of the sleeve above the diaphragm through the annular groove and the air hole.

[0014] In the preferred embodiment of the above-mentioned bidirectional pilot-operated solenoid valve, the main valve core further includes a rigid valve disc and a sealing ring. The rigid valve disc is installed on the bottom surface of the diaphragm. The end face of the rigid valve disc that contacts the main valve seat is provided with an annular sealing groove. The sealing ring is nested in the sealing groove. When the flow guiding chamber is closed, the sealing ring is deformed by bidirectional pressure.

[0015] In the preferred embodiment of the above-mentioned bidirectional pilot-operated solenoid valve, the secondary valve core is an electromagnetically driven valve. Attached Figure Description

[0016] Figure 1 This is the main view of the present invention. Figure 1 ; Figure 2 This is the main view of the present invention. Figure 2 ; Figure 3 Cross-sectional view of the present invention Figure 1 ; Figure 4 Cross-sectional view of the present invention Figure 2 ; Figure 5 Cross-sectional view of the present invention Figure 3 ; Figure 6 Cross-sectional view of the present invention Figure 4 ; Figure 7 Cross-sectional view of the present invention Figure 5 ; Figure 8 Cross-sectional view of the present invention Figure 6 ; In the figure: valve body 1, first port 11, second port 12, main valve seat 13, main valve chamber 14, pilot chamber 141, guide chamber 142, main valve core 2, sleeve part 21, annular groove 211, air hole 212, diaphragm 22, elastic element 23, rigid valve disc 24, sealing ring 25, first inflow channel 31, first outflow channel 32, second inflow channel 41, second outflow channel 42, auxiliary valve core 5, first manifold channel 6, second manifold channel 7, first check valve 81, second check valve 82, third check valve 83, fourth check valve 84. Detailed Implementation

[0017] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0018] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "front," and "rear," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] like Figures 1 to 8 As shown, the bidirectional pilot-operated solenoid valve of the present invention includes: a valve body 1 having a first port 11 for fluid inflow and a second port 12 for fluid outflow, and a main valve seat 13 and a main valve chamber 14 formed between the first port 11 and the second port 12; a main valve core 2 dividing the main valve chamber 14 to form a pilot chamber 141 and a guide chamber 142, and capable of contacting or separating the main valve seat 13 to control the opening and closing of the guide chamber 142; a first inflow channel 31 and a first outflow channel 32, the first inflow channel 31 allowing fluid in the first port 11 to flow to the pilot chamber 141, and the first outflow channel 32 allowing fluid in the pilot chamber 141 to flow to the second port 12; a second inflow channel 41 and a second outflow channel 42, the second inflow channel 41 and the ... The inlet channel 41 allows fluid in the second port 12 to flow to the pilot chamber 141, and the second outlet channel 42 allows fluid in the pilot chamber 141 to flow to the first port 11. The auxiliary valve core 5 is an electromagnetically driven valve used to synchronize the opening and closing of the first outlet channel 32 and the second outlet channel 42. When the auxiliary valve core 5 is closed, the pilot chamber 141 introduces high-pressure side pressure through the first inlet channel 31 or the second inlet channel 41, pushing the main valve core 2 to contact the main valve seat 13, thereby closing the guide chamber 142. When the auxiliary valve core 5 is open, the pilot chamber 141 releases pressure to the low-pressure side through the first outlet channel 32 or the second outlet channel 42, and the main valve core 2 is pushed upward by the fluid to separate from the main valve seat 13, thereby opening the guide chamber 142.

[0021] See Figures 1 to 3 The valve body 1 has a first port 11 and a second port 12 connected through the main valve chamber 14. The main valve seat 13 is located at the end of the first port 11. The main valve core 2 is installed in the main valve chamber 14. The main valve core 2 horizontally divides the main valve chamber 14 into an upper pilot chamber 141 and a lower guide chamber 142. By contacting or separating the main valve seat 13 with the bottom end of the main valve core 2, the flow chamber 142 connected by the first port 11 and the second port 12 can be controlled to open or close.

[0022] See Figures 3 to 8 The valve body 1 has a first inflow channel 31 and a second outflow channel 42 connected to the first port 11, and a second inflow channel 41 and a first outflow channel 32 connected to the second port 12. The first inflow channel 31 and the first outflow channel 32 are the first path, and the second inflow channel 41 and the second outflow channel 42 are the second path.

[0023] When the fluid flows from the first port 11 to the second port 12, the first port 11 is the high-pressure side and the second port 12 is the low-pressure side. By controlling the secondary valve core 5 to close, the first outflow channel 32 and the second outflow channel 42 are blocked. The high-pressure fluid in the first port 11 enters the pilot chamber 141 through the first inflow channel 31. The high-pressure fluid acting on the pilot chamber 141 can counteract the fluid pressure discharged through the main valve seat 13, causing the main valve core 2 to press against the main valve seat 13, thereby blocking the guide chamber 142 and closing the valve. By controlling the secondary valve core 5 to open, the blockage of the first outflow channel 32 and the second outflow channel 42 is released. Since the second port 12 is the low-pressure side, the high-pressure fluid in the pilot chamber 141 is discharged into the second port 12 through the first outflow channel 32. This causes the fluid pressure discharged through the main valve seat 13 to push the main valve core 2 upward, thereby opening the guide chamber 142 and opening the valve.

[0024] When the fluid flows from the second port 12 towards the first port 11, the second port 12 is the high-pressure side and the first port 11 is the low-pressure side. By controlling the secondary valve core 5 to close, the first outflow channel 32 and the second outflow channel 42 are blocked. The high-pressure fluid in the second port 12 enters the pilot chamber 141 through the second inflow channel 41. The high-pressure fluid acting on the pilot chamber 141 can counteract the fluid pressure discharged through the main valve seat 13, causing the main valve core 2 to press against the main valve seat 13, thereby blocking the guide chamber 142 and closing the valve. By controlling the secondary valve core 5 to open, the blockage of the first outflow channel 32 and the second outflow channel 42 is released. Since the first port 11 is the low-pressure side, the high-pressure fluid in the pilot chamber 141 is discharged through the first outflow channel 32, causing the fluid pressure discharged through the main valve seat 13 to push the main valve core 2 upward, thereby opening the guide chamber 142 and opening the valve.

[0025] This application addresses the flow direction of the fluid by providing a first flow channel and a second flow channel within the valve body 1. This ensures that the valve can reliably open or seal when the fluid flows in either the forward or reverse direction, overcoming the limitation of traditional pilot valves that can only seal in one direction. Furthermore, this application utilizes only the auxiliary valve core 5 to control the synchronous opening and closing of the first outflow channel 32 and the second outflow channel 42, thereby controlling the opening or sealing of the valve. This approach features high response efficiency and low energy consumption.

[0026] In one or more embodiments, the first inflow channel 31 and the second inflow channel 41 are connected to each other and are connected to the pilot chamber 141 through the first confluence channel 6; the first outflow channel 32 and the second outflow channel 42 are connected to each other and are connected to the first confluence channel 6 through the second confluence channel 7; the auxiliary valve core 5 controls the synchronous opening and closing of the first outflow channel 32 and the second outflow channel 42 by controlling the opening and closing of the second confluence channel 7.

[0027] See Figures 3 to 8 The first inflow channel 31 and the second inflow channel 41 are independent of each other within the valve body 1. After being connected within the valve body 1, they are connected to the pilot chamber 141 through a single first manifold 6. The first outflow channel 32 and the second outflow channel 42 are also independent of each other within the valve body 1. After being connected within the valve body 1, they are connected to the first manifold 6 through a single second manifold 7. The sealing part of the auxiliary valve core 5 can control the opening or sealing of the second manifold 7 to control the connection and disconnection between the second manifold 7 and the first manifold 6. This arrangement optimizes the internal flow channels of the valve body 1, reduces the processing difficulty of the inflow and outflow channels, and ensures normal fluid flow within each channel.

[0028] In one or more embodiments, a first check valve 81 is provided in the first inflow channel 31, and a second check valve 82 is provided in the first outflow channel 32; a third check valve 83 is provided in the second inflow channel 41, and a fourth check valve 84 is provided in the second outflow channel 42.

[0029] See Figures 4 to 7 The first check valve 81 allows fluid in the first port 11 to enter the pilot chamber 141 unidirectionally through the first inflow channel 31. The second check valve 82 allows fluid in the pilot chamber 141 to flow unidirectionally through the first outflow channel 32 to the second port 12. The third check valve 83 allows fluid in the second port 12 to enter the pilot chamber 141 unidirectionally through the second inflow channel 41. The fourth check valve 84 allows fluid in the pilot chamber 141 to flow unidirectionally through the second outflow channel 42 to the first port 11. Based on the directional isolation structure of the four check valves, the problem of bidirectional leakage can be completely eliminated, ensuring that the pilot valve of this application can adapt to the flow of bidirectional fluid.

[0030] In one or more embodiments, the check valve is one of an umbrella check valve, a swing check valve, or a ball check valve. See also Figures 4 to 7 The diagram shows that the first check valve 81, the second check valve 82, the third check valve 83, and the fourth check valve 84 have an umbrella-shaped structure. It can be understood that the shape of the above four check valves is not specifically limited and can be selected according to actual production needs.

[0031] In one or more embodiments, the main valve core 2 includes a sleeve portion 21 nested within the main valve chamber 14, a diaphragm 22 fixed by the sleeve portion 21 to separate the main valve chamber 14, and an elastic member 23 disposed in the inner cavity of the sleeve portion 21 to press against the back of the diaphragm 22; wherein, an annular groove 211 is provided on the side of the sleeve portion 21, the annular groove 211 communicates with the inner cavity of the sleeve portion 21 through at least one air hole 212, and the first inflow channel 31 and the second inflow channel 41 communicate with the inner cavity of the sleeve above the diaphragm 22 through the annular groove 211 and the air hole 212.

[0032] See Figure 3 , Figure 6 The main valve core 2 includes a sleeve portion 21, a diaphragm 22, and an elastic element 23. The sleeve portion 21 horizontally clamps the diaphragm 22, and the elastic element 23 is disposed in the space above the diaphragm 22 within the inner cavity of the sleeve portion 21. When the main valve core 2 is installed in the main valve chamber 14 of the valve body 1, the sleeve portion 21 is pressed against the inner wall of the main valve chamber 14. An annular groove 211 is formed on the outer periphery of the sleeve portion 21. The inner wall of the annular groove 211 is connected to the space above the diaphragm 22 through an air hole 212. That is, the annular groove 211, the air hole 212, and the space above the diaphragm 22 of the sleeve portion 21 together form a pilot chamber 141, and the space below the diaphragm 22 of the sleeve portion 21 forms a flow guiding chamber 142. See also Figure 3 , Figure 6 The vent 212 has multiple vents that are evenly distributed along the central axis of the sleeve portion 21, allowing the fluid to flow into or out of the inner cavity of the sleeve portion 21 evenly, improving the uniformity of the fluid pressure acting on the surface of the diaphragm 22, and improving the sealing effect of the main valve core 2 on the main valve seat 13.

[0033] In one or more embodiments, the main valve core 2 further includes a rigid valve disc 24 and a sealing ring 25. The rigid valve disc 24 is mounted on the bottom surface of the diaphragm 22. The end face of the rigid valve disc 24 that contacts the main valve seat 13 is provided with an annular sealing groove. The sealing ring 25 is nested in the sealing groove. When the flow guiding chamber 142 is closed, the sealing ring 25 is deformed by bidirectional pressure. See also Figure 3 , Figure 6 The cross-section of the annular sealing groove at the bottom of the rigid valve disc 24 is T-shaped or inverted conical, which allows the sealing ring 25 to be more securely nested at the bottom of the rigid valve disc 24, thereby improving the sealing strength between the main valve core 2 and the main valve seat 13.

[0034] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A bidirectional pilot-operated solenoid valve, characterized in that, include: The valve body has a first port for fluid inflow and a second port for fluid outflow, as well as a main valve seat and a main valve chamber formed between the first port and the second port; The main valve core divides the main valve chamber into a pilot chamber and a flow guiding chamber, and can contact or separate the main valve seat to control the opening and closing of the flow guiding chamber; A first inflow channel and a first outflow channel, the first inflow channel allowing fluid in the first port to flow to the pilot chamber, and the first outflow channel allowing fluid in the pilot chamber to flow to the second port; A second inflow channel and a second outflow channel, the second inflow channel allowing fluid in the second port to flow to the pilot chamber, and the second outflow channel allowing fluid in the pilot chamber to flow to the first port; The secondary valve core is used to synchronize the opening and closing of the first and second outflow channels. When the secondary valve core is closed, the pilot chamber introduces high-pressure side pressure through the first or second inflow channel, pushing the main valve core to contact the main valve seat, thereby closing the guide chamber. When the secondary valve core is open, the pilot chamber releases pressure to the low-pressure side through the first or second outflow channel, and the main valve core is pushed upward by the fluid to separate from the main valve seat, thereby opening the guide chamber.

2. The bidirectional pilot-operated solenoid valve according to claim 1, characterized in that: The first inflow channel and the second inflow channel are interconnected and connected to the pilot chamber through the first confluence channel.

3. The bidirectional pilot-operated solenoid valve according to claim 2, characterized in that: The first outflow channel is connected to the second outflow channel and is connected to the first confluence channel through the second confluence channel. The auxiliary valve core controls the synchronous opening and closing of the first outflow channel and the second outflow channel by controlling the opening and closing of the second confluence channel.

4. The bidirectional pilot-operated solenoid valve according to claim 1, characterized in that: A first check valve is provided in the first inflow channel, and a second check valve is provided in the first outflow channel.

5. The bidirectional pilot-operated solenoid valve according to claim 1, characterized in that: A third check valve is provided in the second inflow channel, and a fourth check valve is provided in the second outflow channel.

6. The bidirectional pilot-operated solenoid valve according to claim 4 or 5, characterized in that: The check valve is one of an umbrella check valve, a swing check valve, or a ball check valve.

7. The bidirectional pilot-operated solenoid valve according to claim 1 or 2, characterized in that: The main valve core includes a sleeve portion nested inside the main valve chamber, a diaphragm fixed by the sleeve portion to divide the main valve chamber, and an elastic member disposed in the inner cavity of the sleeve portion to press against the back of the diaphragm; wherein, an annular groove is formed on the side of the sleeve portion, the annular groove is connected to the inner cavity of the sleeve portion through at least one air hole, and the first inflow channel and the second inflow channel are connected to the inner cavity of the sleeve above the diaphragm through the annular groove and the air hole.

8. The bidirectional pilot-operated solenoid valve according to claim 7, characterized in that: The main valve core also includes a rigid valve disc and a sealing ring. The rigid valve disc is installed on the bottom surface of the diaphragm. The end face of the rigid valve disc that contacts the main valve seat is provided with an annular sealing groove. The sealing ring is nested in the sealing groove. When the flow guiding chamber is closed, the sealing ring is deformed by bidirectional pressure.

9. The bidirectional pilot-operated solenoid valve according to claim 1, characterized in that: The secondary valve core is an electromagnetically driven valve.

Images