Solenoid valve

Abstract

The utility model provides an electromagnetic valve, which comprises a valve body assembly, a valve element, a valve element, a valve element, a valve element and a valve element, and is characterized in that a first valve port and a second valve port are arranged at two ends of the circulation cavity; the piston assembly is arranged in the circulation cavity and provided with a piston cavity, a first piston and a second piston which are oppositely arranged, the first piston can move relative to the first valve port so as to block or open the first valve port, the second piston can move relative to the second valve port so as to block or open the second valve port, and the piston assembly is further provided with an elastic piece. The elastic piece is arranged in the piston cavity, one end of the elastic piece is connected with the first piston, and the other end of the elastic piece is connected with the second piston and used for providing elastic force away from the first piston and the second piston. The pilot valve assembly is arranged on the valve body assembly and provided with a pilot valve cavity, and the pilot valve cavity communicates with the piston cavity and is used for adjusting the pressure in the piston cavity. By means of the technical scheme, the problem that in the prior art, the using effect is poor when a piston of an electromagnetic valve opens or blocks a valve port can be solved.

Description

Technical Field

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

[0002] The solenoid valve in the prior art usually includes a pilot valve assembly, a piston assembly and a valve body assembly. The valve body assembly is used to connect with the pipeline. The valve body assembly has a valve port. The piston assembly is arranged in the valve body assembly. The piston assembly has a piston cavity. The piston cavity is provided with an elastic member and a piston. The pilot valve assembly is connected with the piston cavity. The pilot valve assembly can control the pressure inside the piston cavity, so that the piston moves relative to the valve port under the drive of the elastic member and the pressure to block or open the valve port, thereby controlling the on-off of the fluid pipeline. However, in the process of the piston assembly, when the elastic member overcomes the pressure of the fluid to push the piston to block the valve port, if the pressure of the fluid on the piston is large, the piston may not block the valve port in place, causing leakage at the valve port; in the process of the elastic member overcoming the pressure of the fluid to push the piston to open the valve port, if the pressure of the fluid on the piston is small, the piston may not open the valve port in time, affecting the reaction speed of the solenoid valve and the use effect of the solenoid valve. Utility Model Content

[0003] The utility model provides a solenoid valve to solve the problem that the piston of the solenoid valve in the prior art has a poor use effect in the process of opening or blocking a valve port.

[0004] The utility model provides a solenoid valve, which comprises: a valve body assembly, which has a circulation cavity, and two ends of the circulation cavity have a first valve port and a second valve port which are arranged oppositely; a piston assembly, which is arranged in the circulation cavity, and the piston assembly has a piston cavity, and the piston assembly has a first piston and a second piston which are arranged oppositely, the first piston is arranged corresponding to the first valve port, and the first piston can move relative to the first valve port to block or open the first valve port, the second piston is arranged corresponding to the second valve port, and the second piston can move relative to the second valve port to block or open the second valve port, the piston assembly also has an elastic member, the elastic member is arranged in the piston cavity, one end of the elastic member is connected to the first piston, and the other end of the elastic member is connected to the second piston, and the elastic member is used to provide an elastic force to move the first piston and the second piston away from each other; a pilot valve assembly, which is arranged on the valve body assembly, and the pilot valve assembly has a pilot valve cavity, and the pilot valve cavity is connected to the piston cavity and is used to adjust the pressure in the piston cavity.

[0005] Furthermore, the first valve port is connected to a first connecting pipe, the second valve port is connected to a second connecting pipe, the pilot valve assembly has a pilot valve cavity, the pilot valve cavity is connected to the piston cavity, the pilot valve assembly also has a first flow channel and a second flow channel, one end of the first flow channel is connected to the first connecting pipe, the other end of the first flow channel is connected to the pilot valve cavity, one end of the second flow channel is used to communicate with the second connecting pipe, the other end of the second flow channel is connected to the pilot valve cavity, the pilot valve assembly has a relatively set open state and a closed state, when the pilot valve assembly is in the open state, one of the first connecting pipe and the second connecting pipe is connected to the pilot valve cavity, the first piston opens the first valve port, and the second piston opens the second valve port; when the pilot valve assembly is in the closed state, the first piston blocks the first valve port, and the second piston blocks the second valve port.

[0006] Furthermore, a balancing channel is provided between the piston chamber and the circulation chamber to connect the piston chamber and the circulation chamber, and a minimum circulation area of ​​the balancing channel is respectively smaller than a minimum circulation area of ​​the first flow channel and a minimum circulation area of ​​the second flow channel.

[0007] Furthermore, the piston assembly also includes a piston sleeve, a first piston and a second piston are arranged in the piston sleeve, the first piston and the second piston can move along the extension direction of the piston sleeve, the outer wall of the first piston and the inner wall of the piston sleeve and the outer wall of the second piston and the inner wall of the piston sleeve are all sealed, and the first piston, the second piston and the piston sleeve form a piston cavity.

[0008] Furthermore, a limiting structure is provided between the first piston and the second piston to limit the positions of the first piston and the second piston moving toward each other.

[0009] Furthermore, an opening is provided on the inner wall of the limiting boss, and the piston cavity is communicated with the pilot valve cavity through the opening.

[0010] Furthermore, the first piston has a first valve opening end surface at one end facing the first valve port, and when the first piston blocks the first valve port, there is a gap between the first valve opening end surface and the inner wall of the circulation chamber; the second piston has a second valve opening end surface at one end facing the second valve port, and when the second piston blocks the second valve port, there is a gap between the second valve opening end surface and the inner wall of the circulation chamber.

[0011] Furthermore, a first sealing gasket is provided on a side of the first piston close to the first valve port, and a second sealing gasket is provided on a side of the second piston close to the second valve port.

[0012] Furthermore, the first sealing gasket is provided with a first matching section, the outer diameter of which gradually increases along the side away from the first valve port, and the second sealing gasket is provided with a second matching section, the outer diameter of which gradually increases along the side away from the second valve port.

[0013] Furthermore, a first mounting boss is provided on the end surface of the first piston close to the first valve port, the first sealing gasket is sleeved on the first mounting boss, and a first mounting block is also provided on the side of the first sealing gasket close to the first valve port, the first mounting block is fixedly connected to the first mounting boss, or the end of the first mounting block away from the first sealing gasket is limitedly matched with the first mounting boss to fix the first sealing gasket; a second mounting boss is provided on the side of the second piston close to the second valve port, the second sealing gasket is sleeved on the second mounting boss, and a second mounting block is also provided on the side of the second sealing gasket close to the second valve port, the second mounting block is fixedly connected to the second mounting boss, or the end of the second mounting block away from the second sealing gasket is limitedly matched with the second mounting boss to fix the second sealing gasket.

[0014] Furthermore, the outer diameter of the first mounting block gradually increases from the first valve port to the second valve port, and the outer diameter of the second mounting block gradually increases from the second valve port to the first valve port.

[0015] By applying the technical solution provided by the utility model, the two ends of the circulation chamber are provided with a first valve port and a second valve port which are arranged opposite to each other. When the solenoid valve is in the process of opening, the pilot valve assembly controls the pressure in the piston chamber to drop, and the pressure of the fluid on the high-pressure side is greater than the sum of the elastic force of the elastic member and the pressure of the fluid in the piston chamber on the first piston or the second piston. The fluid on the high-pressure side can overcome the elastic force of the elastic member and push one of the first piston or the second piston to open the corresponding first valve port or the second valve port, and the fluid can enter the circulation chamber, and the other of the first piston and the second piston can open the corresponding first valve port or the second valve port under the drive of the fluid; when the solenoid valve is in the process of closing, the pilot valve assembly controls the pressure in the piston chamber to rise, and the pressure of the fluid on the high-pressure side or the low-pressure side will be less than the sum of the elastic force of the elastic member and the pressure of the fluid in the piston chamber on the first piston or the second piston. Under the push of the elastic member, the first piston moves toward the first valve port to block the first valve port, and the second piston moves toward the second valve port to block the second valve port, and the fluid cannot pass through the valve body assembly. During the process of opening and closing the solenoid valve, because the first piston and the second piston share the elastic part, the arrangement space of the elastic part is larger, so that an elastic part with smaller stiffness can be used, reducing the force difference of the elastic part, and making the action of the elastic part more reliable: when the solenoid valve is opening, the length of the elastic part is longer, and the elastic force of the elastic part is smaller at this time, so that the fluid can overcome the elastic force of the elastic part and facilitate the opening of the solenoid valve; when the solenoid valve is closing, the elastic part is compressed and the length is shorter. At this time, the elastic force of the elastic part is larger, so that the elastic part can overcome the pressure of the fluid and facilitate the closing of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 The structure schematic diagram of the solenoid valve provided by the utility model is shown when the fluid flows from the first connecting pipe to the second connecting pipe and the piston assembly is in a conducting state;

[0018] Figure 2 The structure schematic diagram of the solenoid valve provided by the utility model is shown when the fluid flows from the first connecting pipe to the second connecting pipe and the piston assembly is in a blocking state;

[0019] Figure 3 Shows Figure 1 A partial enlarged view of the middle A;

[0020] Figure 4 The structure schematic diagram of the solenoid valve provided by the utility model is shown when the fluid flows from the second connecting pipe to the first connecting pipe and the piston assembly is in a blocking state;

[0021] Figure 5 The structure schematic diagram of the solenoid valve provided by the utility model is shown when the fluid flows from the second connecting pipe to the first connecting pipe and the piston assembly is in a blocking state;

[0022] Figure 6 Shows Figure 4 A partial enlarged view of point B in the middle;

[0023] Figure 7 The schematic diagram of the structure of the piston assembly provided by the utility model is shown.

[0024] The above drawings include the following reference numerals:

[0025] 1. First takeover; 2. Second takeover;

[0026] 100, circulation chamber; 200, piston chamber; 300, pilot valve chamber;

[0027] 10. Valve body assembly; 101. First valve port; 102. Second valve port;

[0028] 20. Piston assembly;

[0029] 21, first piston; 211, first sealing gasket; 2111, first matching section; 212, first mounting boss; 213, first mounting block; 201, first valve opening end surface;

[0030] 22, second piston; 221, second sealing gasket; 2211, second matching section; 222, second mounting boss; 223, second mounting block; 202, second valve opening end surface;

[0031] 23. Piston sleeve; 234. Position limiting boss; 24. Elastic member;

[0032] 30. pilot valve assembly; 301. first flow channel; 302. second flow channel;

[0033] 31. First one-way valve; 32. Second one-way valve;

[0034] 41. First capillary; 42. Second capillary. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0036] like Figures 1 to 7 As shown, the embodiment of the utility model provides a solenoid valve, which includes a valve body assembly 10, a piston assembly 20 and a pilot valve assembly 30. The valve body assembly 10 has a flow chamber 100, and the two ends of the flow chamber 100 have a first valve port 101 and a second valve port 102 arranged oppositely. The piston assembly 20 is arranged in the circulation chamber 100, and the piston assembly 20 has a piston chamber 200. The piston assembly 20 has a first piston 21 and a second piston 22 arranged opposite to each other. The first piston 21 is arranged corresponding to the first valve port 101, and the first piston 21 can move relative to the first valve port 101 to block or open the first valve port 101. The second piston 22 is arranged corresponding to the second valve port 102, and the second piston 22 can move relative to the second valve port 102 to block or open the second valve port 102. The piston assembly 20 also has an elastic member 24, which is arranged in the piston chamber 200. One end of the elastic member 24 is connected to the first piston 21, and the other end of the elastic member 24 is connected to the second piston 22. The elastic member 24 is used to provide an elastic force to move the first piston 21 and the second piston 22 away from each other. The pilot valve assembly 30 is arranged on the valve body assembly 10, and the pilot valve assembly 30 has a pilot valve chamber 300, which is connected to the piston chamber 200 and is used to adjust the pressure in the piston chamber 200.

[0037] By applying the technical solution provided by the utility model, the two ends of the circulation chamber 100 are provided with a first valve port 101 and a second valve port 102 which are arranged opposite to each other. When the solenoid valve is in the process of opening, the pilot valve assembly 30 controls the pressure in the piston chamber 200 to drop. The pressure of the fluid on the high-pressure side is greater than the sum of the elastic force of the elastic member 24 and the pressure of the fluid in the piston chamber 200 on the first piston 21 or the second piston 22. The fluid on the high-pressure side can overcome the elastic force of the elastic member 24 and push one of the first piston 21 or the second piston 22 to open the corresponding first valve port 101 or the second valve port 102. The fluid can enter the circulation chamber 100, and the first piston 2 1 and the other of the second pistons can open the corresponding first valve port 101 or the second valve port 102 under the drive of the fluid; when the solenoid valve is in the process of closing, the pilot valve assembly 30 controls the pressure in the piston chamber 200 to rise, and the pressure of the high-pressure side fluid or the low-pressure side fluid will be less than the sum of the elastic force of the elastic member 24 and the pressure of the fluid in the piston chamber 200 on the first piston 21 or the second piston 22. Under the push of the elastic member 24, the first piston 21 moves toward the first valve port 101 to block the first valve port 101, and the second piston 22 moves toward the second valve port 102 to block the second valve port 102, and the fluid cannot pass through the valve body assembly 10. During the process of opening and closing the solenoid valve, because the first piston 21 and the second piston 22 share the elastic member 24, the arrangement space of the elastic member 24 is larger, so that an elastic member with smaller stiffness can be used to reduce the force difference of the elastic member 24, and make the action of the elastic member 24 more reliable: when the solenoid valve is opening, the length of the elastic member 24 is longer, and the elastic force of the elastic member 24 is smaller at this time, so that the fluid can overcome the elastic force of the elastic member 24 and facilitate the opening of the solenoid valve; when the solenoid valve is closing, the elastic member 24 is compressed and the length is shorter. At this time, the elastic force of the elastic member 24 is larger, so that the elastic member 24 can overcome the pressure of the fluid and facilitate the closing of the solenoid valve.

[0038] Specifically in one embodiment of the present application, the elastic member 24 is a spring.

[0039] In the present application, the first valve port 101 is connected to the first connecting pipe 1, and the second valve port 102 is connected to the second connecting pipe 2. The pilot valve assembly 30 has a pilot valve cavity 300, and the pilot valve cavity 300 is connected to the piston cavity 200. The pilot valve assembly 30 also has a first flow channel 301 and a second flow channel 302. One end of the first flow channel 301 is connected to the first connecting pipe 1, and the other end of the first flow channel 301 is connected to the pilot valve cavity 300. One end of the second flow channel 302 is used to communicate with the second connecting pipe 2, and the other end of the second flow channel 302 is connected to the pilot valve cavity 300. The pilot valve assembly 30 has a relatively set open state and a closed state. When the pilot valve assembly 30 is in the open state, one of the first connecting pipe 1 and the second connecting pipe 2 is connected to the pilot valve cavity 300, the first piston 21 opens the first valve port 101, and the second piston 22 opens the second valve port 102; when the pilot valve assembly 30 is in the closed state, the first piston 21 blocks the first valve port 101, and the second piston 22 blocks the second valve port 102. With the above arrangement, no matter what the flow direction of the fluid in the first connecting pipe 1 and the second connecting pipe 2 is, one of the first piston 21 and the second piston 22 can block the corresponding first valve port 101 or the second valve port 102 along the flow direction of the fluid, so that the movement direction of the first piston 21 or the second piston 22 is the same as the flow direction of the fluid, thereby improving and ensuring the sealing reliability of the piston assembly 20, and the piston assembly 20 can block the first valve port 101 and the second valve port 102 at the same time, and two cut-off structures can be set on the flow path of the fluid to further ensure the sealing effect of the solenoid valve when closing the valve, thereby ensuring the sealing performance of the solenoid valve.

[0040] In the present application, the pilot valve assembly 30 further includes a first one-way valve 31 and a second one-way valve 32. In some embodiments of the present application, the first one-way valve 31 is arranged on the first flow channel 301, and the first one-way valve 31 is unidirectionally connected from the pilot valve chamber 300 to the direction of the first connecting pipe 1, and the second one-way valve 32 is arranged on the second flow channel 302, and the second one-way valve 32 is unidirectionally connected from the pilot valve chamber 300 to the direction of the second connecting pipe 2. Among them, when the pilot valve assembly 30 is switched to the open state, the first one-way valve 31 connects the pilot valve chamber 300 with the first flow channel 301, and the pilot valve chamber 300 is not connected with the second flow channel 302; or, the second one-way valve 32 connects the pilot valve chamber 300 with the second flow channel 302, and the pilot valve chamber 300 is not connected with the first flow channel 301. Through the above arrangement, when the fluid flows from the first connecting pipe 1 to the second connecting pipe 2, after the pilot valve assembly 30 switches to the open state, the first one-way valve 31 is closed, the first flow channel 301 is not connected to the pilot valve chamber 300, the second one-way valve 32 is opened, and the second flow channel 302 can be connected to the pilot valve chamber 300; when the fluid flows from the second connecting pipe 2 to the first connecting pipe 1, after the pilot valve assembly 30 switches to the open state, the second one-way valve 32 is closed, the second flow channel 302 is not connected to the pilot valve chamber 300, the first one-way valve 31 is opened, and the first flow channel 301 can be connected to the pilot valve chamber 300.

[0041] Specifically, the solenoid valve also includes a first capillary 41 and a second capillary 42, one end of the first capillary 41 is connected to the first connecting pipe 1, and the other end is connected to the pilot valve assembly 30, the first capillary 41 has a first flow channel 301, one end of the second capillary 42 is connected to the second connecting pipe 2, and the other end is connected to the pilot valve assembly 30, and the second capillary 42 has a second flow channel 302.

[0042] In some other embodiments of the present application, the first one-way valve 31 can be arranged on the first connecting pipe 1 and located upstream of the first flow channel 301, and the second one-way valve 32 can be arranged on the second connecting pipe 2 and located upstream of the second flow channel 302 to achieve control of the fluid flow direction.

[0043] In some other embodiments of the present application, the first one-way valve 31 and the second one-way valve 32 may both be disposed on the pilot valve assembly 30 to achieve control over the flow direction of the fluid.

[0044] Specifically, the first piston 21 has a first valve opening end face 201 at one end facing the first valve port 101, and when the first piston 21 blocks the first valve port 101, there is a gap between the first valve opening end face 201 and the inner wall of the circulation chamber 100; the second piston 22 has a second valve opening end face 202 at one end facing the second valve port 102, and when the second piston 22 blocks the second valve port 102, there is a gap between the second valve opening end face 202 and the inner wall of the circulation chamber 100. Through the above-mentioned arrangement, when the first piston 21 opens the first valve port 101 and the second piston 22 blocks the second valve port 102, after the fluid enters the circulation chamber 100 through the first valve port 101, the fluid can enter the gap between the second valve opening end face 202 and the inner wall of the circulation chamber 100, so as to provide the second piston 22 with a driving force to move away from the second valve port 102, so as to realize the opening of the solenoid valve; when the second piston 22 opens the second valve port 102 and the first piston 21 blocks the first valve port 101, after the fluid enters the circulation chamber 100 through the second valve port 102, the fluid can enter the gap between the first valve opening end face 201 and the inner wall of the circulation chamber 100, so as to provide the first piston 21 with a driving force to move away from the first valve port 101, so as to realize the opening of the solenoid valve.

[0045] Furthermore, the first piston 21 has a first valve opening section at one end away from the second piston 22, and the side wall of the first valve opening section forms a first valve opening end face 201. The outer diameter of the first valve opening section can gradually increase in the direction away from the first valve port 101. The second piston 22 has a second valve opening section at one end away from the first piston 21, and the side wall of the second valve opening section forms a second valve opening end face 202. The outer diameter of the second valve opening section can gradually increase in the direction away from the second valve port 102. Such an arrangement can guide the fluid between the first valve opening end face 201 and the second valve opening end face 202 and the inner wall of the circulation chamber, which is beneficial to reducing flow resistance.

[0046] In a feasible embodiment of the present application, when the solenoid valve switches from the closed state to the open state, the switching action of the piston assembly 20 is as follows:

[0047] Reference Figures 1 to 3 As shown, when the fluid flows from the first connecting pipe 1 to the second connecting pipe 2, the pressure in the first connecting pipe 1 is greater than the pressure in the second connecting pipe 2, the pilot valve assembly 30 is switched to the open state, the first check valve 31 on the first flow channel 301 is closed, the first flow channel 301 is not connected to the pilot valve chamber 300, the second check valve 32 on the second flow channel 302 is opened, the pilot valve chamber 300 is connected to the second flow channel 302, the piston chamber 200 can be connected to the second flow channel 302, the pressure in the piston chamber 200 is reduced, at this time the pressure in the first connecting pipe 1 is greater than the pressure in the piston chamber 200, the pressure on the first piston 21 from the first connecting pipe 1 is greater than the pressure in the piston chamber 200 and the elastic member 24 Pressure, the first piston 21 moves in the direction away from the first valve port 101, the first valve port 101 is opened, the fluid enters the circulation chamber 100, and enters the gap between the second valve opening end face 202 and the circulation chamber 100, providing pressure to the second piston 22 in the direction away from the second valve port 102, the pressure applied to the end of the second piston 22 by the fluid is greater than the pressure in the piston chamber 200 and the pressure of the elastic member 24, the second piston 22 can move in the direction away from the second valve port 102 driven by the pressure difference, the second valve port 102 is opened, the piston assembly 20 is switched to the conducting state, and the fluid can flow from the first connecting pipe 1 to the second connecting pipe 2 through the circulation chamber 100.

[0048] Reference Figures 4 to 6As shown, when the fluid flows from the second connecting pipe 2 to the first connecting pipe 1, the pressure in the second connecting pipe 2 is greater than the pressure in the first connecting pipe 1, the pilot valve assembly 30 is switched to the open state, the second one-way valve 32 on the second flow channel 302 is closed, the second flow channel 302 is not connected to the pilot valve chamber 300, the first one-way valve 31 on the first flow channel 301 is opened, the pilot valve chamber 300 is connected to the first flow channel 301, the piston chamber 200 can be connected to the first flow channel 301, the pressure in the piston chamber 200 is reduced, at this time the pressure in the second connecting pipe 2 is greater than the pressure in the piston chamber 200, the pressure on the second piston 22 from the second connecting pipe 2 is greater than the pressure of the piston chamber 200 and the elastic member 24 The second piston 22 moves in a direction away from the second valve port 102, the second valve port 102 opens, the fluid enters the circulation chamber 100, and enters the gap between the first valve opening end face 201 and the circulation chamber 100, providing pressure to the first piston 21 in a direction away from the first valve port 101. The pressure applied to the end of the first piston 21 by the fluid is greater than the pressure in the piston chamber 200 and the pressure of the elastic member 24. The first piston 21 can move in a direction away from the first valve port 101 driven by the pressure difference, the first valve port 101 opens, the piston assembly 20 switches to the conducting state, and the fluid can flow from the second connecting pipe 2 to the first connecting pipe 1 through the circulation chamber 100.

[0049] Specifically, there is a balancing channel between the piston chamber 200 and the circulation chamber 100 to connect the piston chamber 200 and the circulation chamber 100. The minimum flow area of ​​the balancing channel is smaller than the minimum flow area of ​​the first flow channel 301 and the second flow channel 302, that is, the minimum flow area of ​​the balancing channel is smaller than the minimum flow area of ​​the first one-way valve 31 and the second one-way valve 32. Through the above arrangement, when the valve is closed, the fluid in the circulation chamber 100 can enter the piston chamber 200 through the balancing channel to avoid the piston chamber 200 from holding air and affecting the valve closing. When the valve is opened, since the flow capacity of the balancing channel at the minimum flow area is smaller than the minimum flow area of ​​the first one-way valve 31 and the second one-way valve 32, it can ensure that the pressure in the piston chamber 200 is smaller than the pressure in the circulation chamber 100, so as to ensure the reliability of the valve opening.

[0050] In a feasible embodiment of the present application, when the solenoid valve switches from the open state to the closed state, the switching action of the piston assembly 20 is as follows:

[0051] Reference Figures 1 to 6As shown, the pilot valve assembly 30 is switched to the closed state, the first flow channel 301 and the second flow channel 302 are not connected to the pilot valve chamber 300, the fluid in the circulation chamber 100 flows into the piston chamber 200 through the balance channel, the pressure in the piston chamber 200 increases, the pressure of the piston chamber 200 on the first piston 21 and the second piston 22 cooperates with the pressure of the elastic member 24 on the first piston 21 and the second piston 22, so that the first piston 21 moves toward the first valve port 101, and the second piston 22 moves toward the second valve port 102, the piston assembly 20 is switched to the blocking state, the first piston 21 blocks the first valve port 101, the second piston 22 blocks the second valve port 102, and the first pipe 1 and the second pipe 2 are not connected to the circulation chamber 100. Among them, the valve port corresponding to the pipe for circulating low-pressure fluid is closed first.

[0052] like Figure 7 As shown, specifically in the present application, the piston assembly 20 further includes a piston sleeve 23, a first piston 21 and a second piston 22 are arranged in the piston sleeve 23, the first piston 21 and the second piston 22 can move along the extension direction of the piston sleeve 23, the outer wall of the first piston 21 and the inner wall of the piston sleeve 23, and the outer wall of the second piston 22 and the inner wall of the piston sleeve 23 are all sealed, and the first piston 21, the second piston 22 and the piston sleeve 23 surround a piston cavity 200. Through the above arrangement, the sealing performance of the piston cavity 200 can be guaranteed, and the stability of the solenoid valve during the opening and closing process can be guaranteed.

[0053] In one embodiment of the present application, a sealing ring is disposed between the outer wall of the first piston 21 and the second piston 22 and the inner wall of the piston sleeve 23 .

[0054] Specifically, there is a limiting structure between the first piston 21 and the second piston 22 to limit the position of the first piston 21 and the second piston 22 moving toward each other. By setting the limiting structure, the relative position of the first piston 21 and the second piston 22 can be limited when the piston assembly 20 is switched to the conducting state, ensuring the stable movement of the first piston 21 and the second piston 22.

[0055] In some feasible embodiments of the present application, the limiting structure includes a limiting boss 234, and the limiting boss 234 is arranged on the inner wall of the sealing sleeve. Through the above arrangement, the two end surfaces of the limiting boss 234 arranged opposite to each other can limit the displacement of the first piston 21 and the second piston 22 to limit the stroke of the first piston 21 and the second piston 22.

[0056] In some other embodiments of the present application, the end surfaces of the first piston 21 and the second piston 22 facing each other cooperate with each other to form a limiting structure, so as to reduce the overall volume of the piston assembly 20, which is conducive to the miniaturization of the solenoid valve.

[0057] In some other embodiments of the present application, a limiting protrusion may also be provided on the side walls of the first piston 21 and the second piston 22, and the limiting protrusion may form a limiting structure, through which the two oppositely arranged end surfaces of the piston sleeve 23 cooperate with the limiting protrusion to limit the relative position of the first piston 21 and the second piston 22 when the piston assembly 20 switches to the conducting state.

[0058] In some other embodiments of the present application, the pilot valve assembly 30 is plugged into the piston sleeve 23, and at least part of the pilot valve assembly 30 is inserted into the piston sleeve 23. The pilot valve assembly 30 forms a limiting structure to limit the relative position of the first piston 21 and the second piston 22 when the piston assembly 20 is switched to the conducting state.

[0059] Furthermore, an opening is provided on the inner wall of the limiting boss 234, and the piston cavity 200 is connected with the pilot valve cavity 300 through the opening. In this way, the channel connecting the pilot valve cavity 300 and the piston cavity 200 can avoid the first piston 21 and the second piston 22, and there is no need to set a separate connecting space, which can reduce the overall volume of the piston assembly 20 and is conducive to the miniaturization of the solenoid valve.

[0060] Specifically in the present application, a first sealing gasket 211 is provided on the side of the first piston 21 close to the first valve port 101, and a second sealing gasket 221 is provided on the side of the second piston 22 close to the second valve port 102. By providing the first sealing gasket 211 and the second sealing gasket 221, a soft sealing fit can be formed between the piston assembly 20 and the valve body assembly 10, thereby improving the sealing performance of the piston assembly 20.

[0061] Specifically, the first sealing gasket 211 is provided with a first matching section 2111, and the outer diameter of the first matching section 2111 gradually increases along the side away from the first valve port 101, and the second sealing gasket 221 is provided with a second matching section 2211, and the outer diameter of the second matching section 2211 gradually increases along the side away from the second valve port 102. Through the above arrangement, when the first matching section 2111 is matched with the first valve port 101, and when the second matching section 2211 is matched with the second valve port 102, the side walls of the first matching section 2111 and the second matching section 2211 can form a sealing surface, thereby increasing the sealing area between the first sealing gasket 211 and the first valve port 101 and between the second sealing gasket 221 and the second valve port 102, improving the sealing effect of the first sealing gasket 211 and the second sealing gasket 221, and reducing the internal leakage of the solenoid valve.

[0062] Further in the present application, a first mounting boss 212 is provided on the end surface of the first piston 21 close to the first valve port 101, and the first sealing gasket 211 is sleeved on the first mounting boss 212. A first mounting block 213 is also provided on the side of the first sealing gasket 211 close to the first valve port 101, and the first mounting block 213 is fixedly connected to the first mounting boss 212, or the end of the first mounting block 213 away from the first sealing gasket 211 is limitedly matched with the first mounting boss 212 to fix the first sealing gasket 211; a second mounting boss 222 is provided on the side of the second piston 22 close to the second valve port 102, and the second sealing gasket 221 is sleeved on the second mounting boss 222. A second mounting block 223 is also provided on the side of the second sealing gasket 221 close to the second valve port 102, and the second mounting block 223 is fixedly connected to the second mounting boss 222, or the end of the second mounting block 223 away from the second sealing gasket 221 is limitedly matched with the second mounting boss 222 to fix the second sealing gasket 221. Specifically, the first mounting block 213 can be riveted to the end face of the first mounting boss 212 close to the first valve port 101, and the second mounting block 223 can be riveted to the end face of the second mounting boss 222 close to the second valve port 102 to ensure the stability of the installation of the first sealing gasket 211 and the second sealing gasket 221.

[0063] Furthermore, the outer diameter of the first mounting block 213 gradually increases from the first valve port 101 to the second valve port 102, and the outer diameter of the second mounting block 223 gradually increases from the second valve port 102 to the first valve port 101. Through the above arrangement, when the fluid flows to the first mounting block 213 through the first valve port 101 and flows to the second mounting block 223 through the second valve port 102, the first mounting block 213 and the second mounting block 223 can guide the fluid, so that the fluid flows evenly to the circulation cavity 100, which is convenient for the circulation of the fluid.

[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0065] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0066] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0067] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0068] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0069] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A solenoid valve, characterized in that: The solenoid valve comprises: A valve body assembly (10) having a circulation cavity (100), wherein two ends of the circulation cavity (100) have a first valve port (101) and a second valve port (102) arranged opposite to each other; A piston assembly (20) is arranged in the circulation chamber (100), the piston assembly (20) having a piston chamber (200), the piston assembly (20) having a first piston (21) and a second piston (22) arranged opposite to each other, the first piston (21) being arranged corresponding to the first valve port (101), the first piston (21) being able to move relative to the first valve port (101) to block or open the first valve port (101), the second piston (22) being arranged corresponding to the second valve port (102), the second piston (22) being able to move relative to the first valve port (101) to block or open the first valve port (101), The plug (22) is capable of moving relative to the second valve port (102) to block or open the second valve port (102). The piston assembly (20) further comprises an elastic member (24). The elastic member (24) is arranged in the piston cavity (200). One end of the elastic member (24) is connected to the first piston (21), and the other end of the elastic member (24) is connected to the second piston (22). The elastic member (24) is used to provide an elastic force to move the first piston (21) and the second piston (22) away from each other. A pilot valve assembly (30) is arranged on the valve body assembly (10). The pilot valve assembly (30) has a pilot valve chamber (300). The pilot valve chamber (300) is communicated with the piston chamber (200) and is used to adjust the pressure in the piston chamber (200).

2. The solenoid valve according to claim 1, characterized in that: The first valve port (101) is connected to a first connecting pipe (1), the second valve port (102) is connected to a second connecting pipe (2), the pilot valve assembly (30) comprises a pilot valve chamber (300), the pilot valve chamber (300) is connected to the piston chamber (200), the pilot valve assembly (30) further comprises a first flow channel (301) and a second flow channel (302), one end of the first flow channel (301) is connected to the first connecting pipe (1), the other end of the first flow channel (301) is connected to the pilot valve chamber (300), one end of the second flow channel (302) is connected to the second connecting pipe (2), the other end of the second flow channel (302) is connected to the pilot valve chamber (300), One end is in communication with the pilot valve cavity (300), and the pilot valve assembly (30) has an open state and a closed state that are relatively arranged. When the pilot valve assembly (30) is in the open state, one of the first connecting pipe (1) and the second connecting pipe (2) is in communication with the pilot valve cavity (300), the first piston (21) opens the first valve port (101), and the second piston (22) opens the second valve port (102); when the pilot valve assembly (30) is in the closed state, the first piston (21) blocks the first valve port (101), and the second piston (22) blocks the second valve port (102).

3. The solenoid valve according to claim 2, characterized in that: A balancing channel is provided between the piston chamber (200) and the circulation chamber (100) to connect the piston chamber (200) and the circulation chamber (100), and a minimum circulation area of ​​the balancing channel is respectively smaller than a minimum circulation area of ​​the first flow channel (301) and a minimum circulation area of ​​the second flow channel (302).

4. The solenoid valve according to claim 1, characterized in that: The piston assembly (20) further comprises a piston sleeve (23), wherein the first piston (21) and the second piston (22) are arranged in the piston sleeve (23), wherein the first piston (21) and the second piston (22) are movable along the extension direction of the piston sleeve (23), wherein the outer wall of the first piston (21) and the inner wall of the piston sleeve (23) as well as the outer wall of the second piston (22) and the inner wall of the piston sleeve (23) are sealed, and the first piston (21), the second piston (22) and the piston sleeve (23) enclose the piston chamber (200).

5. The solenoid valve according to claim 4, characterized in that: A limiting structure is provided between the first piston (21) and the second piston (22) to limit the positions of the first piston (21) and the second piston (22) moving toward each other.

6. The solenoid valve according to claim 4, characterized in that: An opening is provided on the side wall of the piston sleeve (23), and the piston chamber (200) is connected to the pilot valve chamber (300) through the opening.

7. The solenoid valve according to claim 1, characterized in that: One end of the first piston (21) facing the first valve port (101) has a first valve opening end surface (201); when the first piston (21) blocks the first valve port (101), a gap exists between the first valve opening end surface (201) and the inner wall of the circulation chamber (100); The second piston (22) has a second valve opening end surface (202) at one end facing the second valve port (102). When the second piston (22) blocks the second valve port (102), there is a gap between the second valve opening end surface (202) and the inner wall of the circulation chamber (100).

8. The solenoid valve according to claim 1, characterized in that: A first sealing gasket (211) is provided on a side of the first piston (21) close to the first valve port (101), and a second sealing gasket (221) is provided on a side of the second piston (22) close to the second valve port (102).

9. The solenoid valve according to claim 8, characterized in that: The first sealing gasket (211) is provided with a first fitting section (2111), and the outer diameter of the first fitting section (2111) gradually increases along a side away from the first valve port (101); the second sealing gasket (221) is provided with a second fitting section (2211), and the outer diameter of the second fitting section (2211) gradually increases along a side away from the second valve port (102).

10. The solenoid valve according to claim 8, characterized in that: A first mounting boss (212) is arranged on the end surface of the first piston (21) close to the first valve port (101), the first sealing gasket (211) is sleeved on the first mounting boss (212), a first mounting block (213) is also arranged on one side of the first sealing gasket (211) close to the first valve port (101), the first mounting block (213) is fixedly connected to the first mounting boss (212), or an end of the first mounting block (213) away from the first sealing gasket (211) is limitedly matched with the first mounting boss (212) to fix the first sealing gasket (211); A second mounting boss (222) is provided on a side of the second piston (22) close to the second valve port (102), and the second sealing gasket (221) is sleeved on the second mounting boss (222). A second mounting block (223) is also provided on a side of the second sealing gasket (221) close to the second valve port (102), and the second mounting block (223) is fixedly connected to the second mounting boss (222), or an end of the second mounting block (223) away from the second sealing gasket (221) is limitedly matched with the second mounting boss (222) to fix the second sealing gasket (221).

11. The solenoid valve according to claim 10, characterized in that: The outer diameter of the first mounting block (213) gradually increases in the direction from the first valve port (101) to the second valve port (102), and the outer diameter of the second mounting block (223) gradually increases in the direction from the second valve port (102) to the first valve port (101).

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