Two-way solenoid valve

Abstract

This invention provides a bidirectional solenoid valve, comprising a main valve assembly, a piston assembly, and a guide structure. The main valve assembly has a piston chamber, a first valve port, and a second valve port. The piston assembly includes a first piston, a second piston, and an elastic element. The first and second pistons are arranged opposite to each other and are movably disposed within the piston chamber. The first piston is used to open and close the first valve port, and the second piston is used to open and close the second valve port. The elastic element is disposed between the first and second pistons, providing an elastic force that keeps the first and second pistons apart. The guide structure is disposed between the first and second pistons, and the elastic element is sleeved on the guide structure, which guides the extension and retraction of the elastic element. Because the guide structure guides the extension and retraction of the elastic element, the elastic element does not bend laterally, ensuring the normal operation of the bidirectional solenoid valve.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and more specifically, to a bidirectional solenoid valve. Background Technology

[0002] The main valve assembly of the bidirectional solenoid valve contains two pistons, each controlling the opening and closing of a valve port. An elastic element is installed between the two pistons, providing a resilient force that keeps them apart. When the valve port is opened, the two pistons move closer together, compressing the elastic element. During compression, the elastic element may bend laterally and become stuck between the piston and the main valve assembly, causing the bidirectional solenoid valve to malfunction. Utility Model Content

[0003] This invention provides a bidirectional solenoid valve to solve the problem that the elastic element in a bidirectional solenoid valve is prone to lateral bending.

[0004] To address the aforementioned problems, according to one aspect of this utility model, a bidirectional solenoid valve is provided. The bidirectional solenoid valve includes a main valve assembly, a piston assembly, and a guide structure. The main valve assembly has a piston chamber, a first valve port, and a second valve port. The piston assembly includes a first piston, a second piston, and an elastic element. The first piston and the second piston are disposed opposite to each other and are movably disposed within the piston chamber. The first piston is used to open and close the first valve port, and the second piston is used to open and close the second valve port. The elastic element is disposed between the first piston and the second piston, providing an elastic force that pushes the first piston and the second piston away from each other. The guide structure is disposed between the first piston and the second piston, and the elastic element is sleeved on the guide structure, which guides the extension and retraction of the elastic element.

[0005] In some embodiments, the guide structure is a cylindrical structure, and one end of the guide structure is fixed to the first piston or the second piston.

[0006] In some embodiments, the first piston includes a first cylinder and a first plug disposed at one end of the first cylinder. The first plug is used to open and close the first valve port. The first plug has an assembly groove. One end of the guide structure is fixed to the assembly groove. The guide structure and a portion of the elastic element are both located inside the first cylinder. One end of the elastic element abuts against the first plug.

[0007] In some embodiments, the guide structure is a cylindrical structure, and the sidewall of the guide structure has a plurality of through-flow grooves, which are distributed circumferentially along the guide structure.

[0008] In some embodiments, the first piston includes a first cylinder and a first plug disposed at one end of the first cylinder, the first plug being used to open and close the first valve port; the second piston includes a second cylinder and a second plug disposed at one end of the second cylinder, the second plug being used to open and close the second valve port; the guide structure has a first end and a second end opposite to each other, the first end of the guide structure is fixedly connected to the first plug, and the second end of the guide structure extends into the second cylinder.

[0009] In some embodiments, when the piston assembly is in a blocked state, it blocks the first valve port and the second valve port; when the piston assembly is in a conducting state, the first valve port and the second valve port are connected. The distance between the first end and the second end of the guide structure is B, and when the piston assembly is in the maximum conducting position, the distance between the first end of the guide structure and the second plug is D, where B < D.

[0010] In some embodiments, when the piston assembly is in the blocked state, the distance between the first end of the guide structure and the second cylinder is A; A < 80% D < B.

[0011] In some embodiments, the bidirectional solenoid valve further includes a pilot valve assembly mounted on the main valve assembly. The pilot valve assembly has a connecting channel and a pilot valve channel. The connecting channel is connected to the piston chamber. The end of the pilot valve channel has an openable and closable pilot valve port. When the pilot valve port is open, the pilot valve channel and the connecting channel are connected. When the pilot valve port is closed, the pilot valve channel and the connecting channel are not connected.

[0012] In some embodiments, the first valve port is connected to a first connecting pipe, and the second valve port is connected to a second connecting pipe; the pilot valve assembly includes a pilot valve seat, two capillary tubes, and two one-way valves. The pilot valve seat has a communicating channel, a pilot valve channel, and a mounting groove. The pilot valve seat is mounted on the main valve assembly, the one-way valve is mounted in the mounting groove, and one end of the capillary tube is mounted in the mounting groove; wherein, when the one-way port of the one-way valve is open, the one-way port is connected to the corresponding channel in the capillary tube; the two capillary tubes are a first capillary tube and a second capillary tube, the first capillary tube is connected to the first connecting pipe, and the second capillary tube is connected to the second connecting pipe;

[0013] When the pilot valve port of the pilot valve seat is open, one of the first capillary tube and the second capillary tube is unidirectionally connected to the pilot valve channel through the corresponding one-way valve, and the piston assembly opens the first valve port and the second valve port; when the pilot valve port is closed, the pilot valve channel and the connecting channel are not connected, and the piston assembly closes the first valve port and the second valve port.

[0014] In some embodiments, the main valve assembly has an outer valve chamber located outside the piston chamber, and both the first valve port and the second valve port are in communication with the outer valve chamber when open; the end of the first piston has a first channel communicating with the first connecting pipe, and the end of the second piston has a second channel communicating with the second connecting pipe; the piston assembly further includes a third check valve and a fourth check valve, the third check valve being installed inside the first piston and the fourth check valve being installed inside the second piston; the third check valve is used to connect the first channel and the piston chamber in one direction, and the fourth check valve is used to connect the second channel and the piston chamber in one direction.

[0015] The bidirectional solenoid valve includes a main valve assembly, a piston assembly, and a guide structure. The piston assembly includes a first piston, a second piston, and an elastic element. The guide structure is positioned between the first and second pistons, and the elastic element is fitted onto the guide structure. The guide structure guides the extension and retraction of the elastic element. Because the guide structure guides the extension and retraction of the elastic element, the elastic element does not bend laterally, ensuring the normal operation of the bidirectional solenoid valve. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of a bidirectional solenoid valve provided in an embodiment of the present invention is shown;

[0018] Figure 2 It shows Figure 1 A schematic diagram of the first piston and guide structure in the middle;

[0019] Figure 3 A schematic diagram of the bidirectional solenoid valve provided in an embodiment of the present invention when the valve port is closed is shown.

[0020] Figure 4 A schematic diagram of the bidirectional solenoid valve provided in an embodiment of the present invention when the valve port is opened is shown.

[0021] The above figures include the following reference numerals:

[0022] 100. Check valve;

[0023] 200, Pilot valve assembly; 210, Pilot valve seat; 211, Pilot valve passage; 221, First capillary tube; 222, Second capillary tube;

[0024] 300. Main valve assembly; 301. Piston chamber; 302. First valve port; 303. Second valve port; 311. First connecting pipe; 312. Second connecting pipe; 321. Outer valve chamber; 353. Conical chamber;

[0025] 400, Piston assembly; 410, First piston; 411, First channel; 412, First cylinder; 413, First plug; 414, Assembly groove; 420, Second piston; 421, Second channel; 422, Second cylinder; 423, Second plug; 430, Elastic element; 440, Third check valve; 450, Fourth check valve;

[0026] 500, guide structure; 501, flow channel. Detailed Implementation

[0027] The technical solutions in at least one embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one embodiment is merely illustrative and is not intended to limit this application or its applications. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application.

[0028] like Figures 1 to 4 As shown, an embodiment of this utility model provides a bidirectional solenoid valve, which includes a main valve assembly 300, a piston assembly 400, and a guide structure 500. The main valve assembly 300 has a piston chamber 301, a first valve port 302, and a second valve port 303. The piston assembly 400 includes a first piston 410, a second piston 420, and an elastic element 430. The first piston 410 and the second piston 420 are arranged opposite to each other and are movably disposed within the piston chamber 301. The first piston 410 is used to open and close the first valve port 302, and the second piston 420 is used to open and close the second valve port 303. The elastic element 430 is disposed between the first piston 410 and the second piston 420, and provides an elastic force that keeps the first piston 410 and the second piston 420 away from each other. The guide structure 500 is disposed between the first piston 410 and the second piston 420, and the elastic element 430 is sleeved on the guide structure 500, which guides the extension and retraction of the elastic element 430.

[0029] The bidirectional solenoid valve includes a main valve assembly 300, a piston assembly 400, and a guide structure 500. The piston assembly 400 includes a first piston 410, a second piston 420, and an elastic element 430. The guide structure 500 is disposed between the first piston 410 and the second piston 420. The elastic element 430 is sleeved on the guide structure 500, and the guide structure 500 guides the extension and retraction of the elastic element 430. Because the guide structure 500 guides the extension and retraction of the elastic element 430, the elastic element 430 will not bend laterally, ensuring the normal operation of the bidirectional solenoid valve.

[0030] In some embodiments, the guide structure 500 is a cylindrical structure, and one end of the guide structure 500 is fixed to the first piston 410 or the second piston 420. The elastic element 430 is a spring, and the spring and the outer peripheral surface of the guide structure 500 are in clearance fit. The guide structure 500 is a cylindrical structure, and one end of the guide structure 500 is fixed, which can better guide the spring and prevent the spring from bending during the extension and contraction process.

[0031] like Figure 1 and Figure 2 As shown, the first piston 410 includes a first cylinder 412 and a first plug 413 disposed at one end of the first cylinder 412. The first plug 413 is used to open and close the first valve port 302. The first plug 413 has an assembly groove 414. One end of the guide structure 500 is fixed to the assembly groove 414. The guide structure 500 and a portion of the elastic member 430 are both located inside the first cylinder 412. One end of the elastic member 430 abuts against the first plug 413. The assembly groove 414 accurately defines the position of the guide structure 500, ensuring the assembly accuracy of the guide structure 500. One end of the guide structure 500 is welded to the inner wall of the assembly groove 414.

[0032] In some embodiments, the guide structure 500 is a cylindrical structure, and the sidewall of the guide structure 500 has a plurality of through flow grooves 501, which are distributed circumferentially along the guide structure 500. In this way, the fluid in the piston chamber 301 can flow through the plurality of flow grooves 501, avoiding the guide structure 500 from obstructing the fluid flow.

[0033] In some embodiments, the first piston 410 includes a first cylinder 412 and a first plug 413 disposed at one end of the first cylinder 412. The first plug 413 is used to open and close the first valve port 302. The second piston 420 includes a second cylinder 422 and a second plug 423 disposed at one end of the second cylinder 422. The second plug 423 is used to open and close the second valve port 303. The guide structure 500 has a first end and a second end opposite to each other. The first end of the guide structure 500 is fixedly connected to the first plug 413, and the second end of the guide structure 500 extends into the second cylinder 422. Regardless of whether the first valve port 302 and the second valve port 303 are in an open or closed state, the second end of the guide structure 500 extends into the second cylinder 422. In this way, the guide structure 500 has sufficient length to guide the elastic element 430 and ensure the guiding effect.

[0034] like Figure 3 and Figure 4 As shown, when the piston assembly 400 is in the blocking state, it blocks the first valve port 302 and the second valve port 303. When the piston assembly 400 is in the conducting state, the first valve port 302 and the second valve port 303 are connected. The distance between the first end and the second end of the guide structure 500 is B. When the piston assembly 400 is in the maximum conducting position, the distance between the first end of the guide structure 500 and the second plug 423 is D, where B < D. This dimensional relationship between B and D prevents the guide structure 500 from being too long, thus preventing the guide structure 500 from pressing against the end of the second piston 420 and affecting valve opening when the piston assembly 400 is in the conducting state.

[0035] In some embodiments, when the piston assembly 400 is in a blocked state, the distance between the first end of the guide structure 500 and the second cylinder 422 is A; A < 80% D < B. The limitation of the dimensional relationship between A, D, and B avoids the guide structure 500 from being too short, ensuring that the guide structure 500 has sufficient length, thereby ensuring the guiding effect on the elastic member 430.

[0036] In some embodiments, the bidirectional solenoid valve further includes a pilot valve assembly 200, which is mounted on the main valve assembly 300. The pilot valve assembly 200 has a communicating channel and a pilot valve channel 211, which communicates with the piston chamber 301. The end of the pilot valve channel 211 has an openable and closable pilot valve port. When the pilot valve port is open, the pilot valve channel 211 and the communicating channel are connected; when the pilot valve port is closed, the pilot valve channel 211 and the communicating channel are not connected. The action of the pilot valve assembly 200 causes a change in the fluid pressure on the piston assembly 400, thereby controlling the action of the piston assembly 400. The main valve assembly 300 has a conical cavity 353, which communicates with the piston chamber 301, and the communicating channel connects the conical cavity 353 and the piston chamber 301.

[0037] like Figure 1As shown, the first valve port 302 is connected to the first connecting pipe 311, and the second valve port 303 is connected to the second connecting pipe 312; the pilot valve assembly 200 includes a pilot valve seat 210, two capillary tubes, and two one-way valves 100. The pilot valve seat 210 has a connecting channel, a pilot valve channel 211, and a mounting groove. The pilot valve seat 210 is installed in the main valve assembly 300, and the one-way valve 100 is installed in the mounting groove. One end of the capillary tube is installed in the mounting groove. When the one-way port of the one-way valve 100 is open, the one-way port and the corresponding channel in the capillary tube are connected. The two capillary tubes are respectively the first capillary tube, the first valve seat 210, the second valve port 302, the second valve port 303, the second valve port 303, and the second valve port 304. The first capillary tube 221 and the second capillary tube 222 are connected. The first capillary tube 221 is connected to the first connecting pipe 311, and the second capillary tube 222 is connected to the second connecting pipe 312. When the pilot valve port of the pilot valve seat 210 is open, one of the first capillary tube 221 and the second capillary tube 222 is connected to the pilot valve channel 211 through the corresponding one-way valve 100, and the piston assembly 400 opens the first valve port 302 and the second valve port 303. When the pilot valve port is closed, the pilot valve channel 211 and the connecting channel are not connected, and the piston assembly 400 closes the first valve port 302 and the second valve port 303.

[0038] Furthermore, the main valve assembly 300 has an outer valve chamber 321 located outside the piston chamber 301. When the first valve port 302 and the second valve port 303 are open, they are both connected to the outer valve chamber 321. The end of the first piston 410 has a first channel 411 connected to the first connecting pipe 311, and the end of the second piston 420 has a second channel 421 connected to the second connecting pipe 312. The piston assembly 400 also includes a third check valve 440 and a fourth check valve 450. The third check valve 440 is installed inside the first piston 410, and the fourth check valve 450 is installed inside the second piston 420. The third check valve 440 is used to connect the first channel 411 and the piston chamber 301 in one direction, and the fourth check valve 450 is used to connect the second channel 421 and the piston chamber 301 in one direction.

[0039] In some embodiments, during the process of the bidirectional solenoid valve switching from the closed state to the open state, the switching action of the piston assembly 400 is as follows:

[0040] When fluid flows from the first connector 311 to the second connector 312, the pressure in the first connector 311 is greater than the pressure in the second connector 312. The pilot valve assembly 200 switches to the open state, the one-way valve 100 in the first capillary tube 221 closes, and the first capillary tube 221 is not connected to the pilot valve passage 211. The one-way valve 100 in the second capillary tube 222 opens, and the pilot valve passage 211 connects to the second capillary tube 222. The piston chamber 301 connects to the second capillary tube 222 through the pilot valve passage 211, and the pressure in the piston chamber 301 decreases. At this time, the pressure in the first connector 311 is greater than the pressure in the piston chamber 301, and the pressure on the first piston 410 from the first connector 311 is greater than the pressure from the piston chamber 301. The pressure of the elastic element 430; the first piston 410 moves away from the first valve port 302, and the first valve port 302 opens; the fluid main valve assembly 300 enters the outer valve chamber 321 and enters the gap between the second piston 420 and the inner wall of the outer valve chamber 321, providing pressure to the second piston 420 in the direction away from the second valve port 303; the pressure of the fluid at the end of the second piston 420 is greater than the fluid pressure in the piston chamber 301 and the pressure of the elastic element 430, and the second piston 420 moves away from the second valve port 303 under the drive of the pressure difference, and the second valve port 303 opens; the piston assembly 400 switches to the conducting state, and the fluid flows from the first connecting pipe 311 to the second connecting pipe 312.

[0041] When fluid flows from the second connector 312 to the first connector 311, the pressure in the second connector 312 is greater than the pressure in the first connector 311; the pilot valve assembly 200 switches to the open state, the one-way valve 100 in the second capillary tube 222 closes, and the second capillary tube 222 is not connected to the pilot valve passage 211; the one-way valve 100 in the first capillary tube 221 opens, and the pilot valve passage 211 connects to the first capillary tube 221; the piston chamber 301 connects to the first capillary tube 221, and the pressure in the piston chamber 301 decreases; at this time, the pressure in the second connector 312 is greater than the pressure of the fluid in the piston chamber 301, and the second piston 420 experiences a greater pressure from the second connector 312 than from the fluid in the piston chamber 301 and a greater elastic force. The pressure of the elastic element 430 is greater than the sum of the pressure in the piston chamber 301 and the pressure of the elastic element 430. Driven by the pressure difference, the first piston 410 moves away from the first valve port 302, and the first valve port 302 opens. The piston assembly 400 switches to the conducting state, and the fluid flows from the second connecting pipe 312 to the first connecting pipe 311.

[0042] Specifically, a balance channel is provided between the piston chamber 301 and the outer valve chamber 321 to connect them. With this arrangement, when the valve is closed, the fluid in the outer valve chamber 321 can enter the piston chamber 301 through the balance channel, preventing the piston chamber 301 from becoming congested and affecting valve closure. During this process, when fluid flows from the first connector 311 to the second connector 312, the pressure in the first connector 311 is greater than the pressure in the second connector 312. The first piston 410 experiences greater pressure and moves before the second piston 420, opening the first valve port 302. Similarly, when fluid flows from the second connector 312 to the first connector 311, the pressure in the second connector 312 is greater than the pressure in the first connector 311. The second piston 420 experiences greater pressure and moves before the first piston 410, opening the second valve port 303. This allows the fluid to flow into the main valve assembly 300 more quickly. The passage in the third check valve 440 and the first passage 411 form an openable and closable balanced passage; the passage in the fourth check valve 450 and the second passage 421 form an openable and closable balanced passage.

[0043] Furthermore, since the first piston 410 and the second piston 420 share the elastic element 430, the arrangement space for the elastic element 430 is larger. This allows the use of an elastic element with lower stiffness, reducing the force difference of the elastic element 430 and making the operation of the elastic element 430 more reliable. When the piston assembly 400 is in a blocked state, the elastic force of the elastic element 430 is smaller, which can also reduce the pressure difference that the first piston 410 or the second piston 420 needs to overcome to generate movement, improve the response speed of the piston assembly 400, and thus improve the opening response speed of the solenoid valve and enhance the performance of the solenoid valve.

[0044] In some embodiments, during the process of the bidirectional solenoid valve switching from the open state to the closed state, the switching action of the piston assembly 400 is as follows:

[0045] When the pilot valve assembly 200 switches to the closed state, neither the first capillary tube 221 nor the second capillary tube 222 is connected to the pilot valve channel 211. The fluid in the outer valve chamber 321 flows into the piston chamber 301 through the balance channel, increasing the pressure in the piston chamber 301. The pressure of the fluid in the piston chamber 301 on the first piston 410 and the second piston 420, combined with the pressure of the elastic element 430 on the first piston 410 and the second piston 420, causes the first piston 410 to move toward the first valve port 302 and the second piston 420 to move toward the second valve port 303. When the piston assembly 400 switches to the blocking state, the first piston 410 blocks the first valve port 302 and the second piston 420 blocks the second valve port 303. Neither the first connecting pipe 311 nor the second connecting pipe 312 is connected to the outer valve chamber 321.

[0046] In the above process, when the fluid flows from the first connector 311 to the second connector 312, the pressure of the fluid in the second connector 312 on the second piston 420 is relatively small, and the second piston 420 will first block the second valve port 303; when the fluid flows from the second connector 312 to the first connector 311, the pressure of the fluid in the first connector 311 on the first piston 410 is relatively small, and the first piston 410 will first block the first valve port 302. Thus, during the valve closing process, the first piston 410 or the second piston 420, moving along the fluid flow direction, can quickly block the main valve assembly 300, improving the sealing effect of the piston assembly 400. Furthermore, the elastic force of the elastic element 430 is relatively large at this time, improving the reliability of valve closing.

[0047] Specifically, the minimum flow area of ​​a balance channel is smaller than the minimum flow area of ​​a one-way valve 100. With the above settings, when the piston assembly 400 is in the conducting state, since the flow capacity of the balance channel is less than the flow capacity of the one-way valve 100 when it is open, the pressure in the piston chamber 301 can be guaranteed to be less than the pressure in the outer valve chamber 321, so as to ensure the reliability of valve opening.

[0048] In some embodiments, the pilot valve assembly 200 further includes a housing and a valve core assembly. The pilot valve seat 210 and the housing cooperate to form an upper valve chamber, which communicates with the piston chamber 301. The first capillary tube 221 and the second capillary tube 222 communicate with the upper valve chamber through an openable / closable pilot valve passage 211. The valve core assembly is movably disposed within the upper valve chamber and can block or open the pilot valve passage 211, allowing the pilot valve assembly 200 to switch between an open and closed state. Thus, the valve core assembly can control whether the first capillary tube 221 and the second capillary tube 222 are connected to the piston chamber 301 by controlling the pilot valve passage 211, improving the control effect of the pilot valve assembly 200 and thereby increasing the response speed of the solenoid valve.

[0049] The above descriptions are merely some embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0050] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification.

[0051] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0052] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0053] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0054] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0055] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

Claims

1. A bidirectional solenoid valve, characterized in that, The bidirectional solenoid valve includes a main valve assembly (300), a piston assembly (400), and a guide structure (500). The main valve assembly (300) has a piston chamber (301), a first valve port (302), and a second valve port (303). The piston assembly (400) includes a first piston (410), a second piston (420), and an elastic element (430). The first piston (410) and the second piston (420) are arranged opposite to each other and are movably disposed within the piston chamber (301). The first piston (410) is used to open and close the first valve port (302), and the second piston (420) is used to open and close the first valve port (302). The piston (420) is used to open and close the second valve port (303). The elastic element (430) is disposed between the first piston (410) and the second piston (420). The elastic element (430) provides an elastic force that keeps the first piston (410) and the second piston (420) away from each other. The guide structure (500) is disposed between the first piston (410) and the second piston (420). The elastic element (430) is sleeved on the guide structure (500). The guide structure (500) guides the extension and retraction of the elastic element (430).

2. The bidirectional solenoid valve according to claim 1, characterized in that, The guide structure (500) is a cylindrical structure, and one end of the guide structure (500) is fixed to the first piston (410) or the second piston (420).

3. The bidirectional solenoid valve according to claim 1, characterized in that, The first piston (410) includes a first cylinder (412) and a first plug (413) disposed at one end of the first cylinder (412). The first plug (413) is used to open and close the first valve port (302). The first plug (413) has an assembly groove (414). One end of the guide structure (500) is fixed to the assembly groove (414). The guide structure (500) and a part of the elastic member (430) are both located inside the first cylinder (412). One end of the elastic member (430) abuts against the first plug (413).

4. The bidirectional solenoid valve according to claim 1, characterized in that, The guide structure (500) is a cylindrical structure, and the side wall of the guide structure (500) has a plurality of through flow grooves (501), which are distributed circumferentially along the guide structure (500).

5. The bidirectional solenoid valve according to claim 1, characterized in that, The first piston (410) includes a first cylinder (412) and a first plug (413) disposed at one end of the first cylinder (412), the first plug (413) being used to open and close the first valve port (302); the second piston (420) includes a second cylinder (422) and a second plug (423) disposed at one end of the second cylinder (422), the second plug (423) being used to open and close the second valve port (303); the guide structure (500) has a first end and a second end opposite to each other, the first end of the guide structure (500) being fixedly connected to the first plug (413), and the second end of the guide structure (500) extending into the second cylinder (422).

6. The bidirectional solenoid valve according to claim 5, characterized in that, When the piston assembly (400) is in the blocking state, it blocks the first valve port (302) and the second valve port (303). When the piston assembly (400) is in the conducting state, the first valve port (302) and the second valve port (303) are connected. The distance between the first end and the second end of the guide structure (500) is B. When the piston assembly (400) is in the maximum conducting position, the distance between the first end of the guide structure (500) and the second plug (423) is D, where B < D.

7. The bidirectional solenoid valve according to claim 6, characterized in that, When the piston assembly (400) is in the blocked state, the distance between the first end of the guide structure (500) and the second cylinder (422) is A; A < 80% D < B.

8. The bidirectional solenoid valve according to claim 1, characterized in that, The bidirectional solenoid valve further includes a pilot valve assembly (200), which is installed on the main valve assembly (300). The pilot valve assembly (200) has a connecting channel and a pilot valve channel (211). The connecting channel is connected to the piston chamber (301). The end of the pilot valve channel (211) has an openable and closable pilot valve port. When the pilot valve port is open, the pilot valve channel (211) is connected to the connecting channel. When the pilot valve port is closed, the pilot valve channel (211) is not connected to the connecting channel.

9. The bidirectional solenoid valve according to claim 8, characterized in that, The first valve port (302) is connected to a first connecting pipe (311), and the second valve port (303) is connected to a second connecting pipe (312); The pilot valve assembly (200) includes a pilot valve seat (210), two capillaries, and two one-way valves (100). The pilot valve seat (210) has a connecting channel, a pilot valve channel (211), and a mounting groove. The pilot valve seat (210) is mounted on the main valve assembly (300), and the one-way valve (100) is mounted in the mounting groove. One end of the capillary is mounted in the mounting groove. When the one-way port of the one-way valve (100) is open, the one-way port is connected to the corresponding channel in the capillary. The two capillaries are a first capillary (221) and a second capillary (222). The first capillary (221) is connected to the first connecting pipe (311), and the second capillary (222) is connected to the second connecting pipe (312). When the pilot valve port of the pilot valve seat (210) is open, one of the first capillary tube (221) and the second capillary tube (222) is unidirectionally connected to the pilot valve channel (211) through the corresponding one-way valve (100), and the piston assembly (400) opens the first valve port (302) and the second valve port (303); when the pilot valve port is closed, the pilot valve channel (211) and the connecting channel are not connected, and the piston assembly (400) closes the first valve port (302) and the second valve port (303).

10. The bidirectional solenoid valve according to claim 9, characterized in that, The main valve assembly (300) has an outer valve chamber (321) located outside the piston chamber (301), which communicates with the outer valve chamber (321) when the first valve port (302) and the second valve port (303) are open; the end of the first piston (410) has a first channel (411) communicating with the first connecting pipe (311), and the end of the second piston (420) has a second channel (421) communicating with the second connecting pipe (312). (400) also includes a third one-way valve (440) and a fourth one-way valve (450), the third one-way valve (440) being installed in the first piston (410) and the fourth one-way valve (450) being installed in the second piston (420), the third one-way valve (440) being used to connect the first channel (411) and the piston chamber (301) in one direction, and the fourth one-way valve (450) being used to connect the second channel (421) and the piston chamber (301) in one direction.

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