Solenoid valve

Abstract

The utility model provides an electromagnetic valve which comprises a valve body assembly, a first valve port and a second valve port, the valve body assembly is provided with a circulation cavity, the first valve port and the second valve port are oppositely arranged, the first valve port is connected with a first connecting pipe, and the second valve port is connected with a second connecting pipe; the piston assembly is movably arranged in the circulation cavity so as to block or open the first valve port and the second valve port, and the piston assembly is provided with a piston cavity; the pilot valve assembly is arranged on the valve body assembly and used for controlling pressure in the piston cavity, the pilot valve assembly is provided with a pilot valve seat and a pilot valve cavity, the pilot valve cavity is communicated with the piston cavity, the pilot valve seat is provided with a flow channel structure, the pilot valve assembly is further provided with a first flow channel and a second flow channel, and the flow channel structure is communicated with the first flow channel, the second flow channel and the pilot valve cavity. The side, connected with the first connecting pipe, of the pilot valve seat and the side, connected with the second connecting pipe, of the pilot valve seat are symmetrically arranged along the plane where the axis of the pilot valve seat is located. By means of the technical scheme, the problem that in the prior art, a pilot valve assembly is complex in machining can be solved.

Description

Technical Field

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

[0002] The solenoid valve in the prior art generally includes a valve body assembly, a piston assembly and a pilot valve assembly. The valve body assembly has a valve port, which is used to communicate with the system pipeline. The piston assembly is arranged in the valve body assembly and is used to block or open the valve port to control the flow of the fluid. The pilot valve assembly can control the pressure on both sides of the piston assembly so that the piston assembly moves due to the pressure difference to block or open the valve port.

[0003] The pilot valve assembly in the prior art usually includes a pilot valve seat, which is used to connect the valve body assembly and the piston assembly. However, the overall structure of the solenoid valve and the flow path of the fluid are relatively complex. Multiple connection structures and flow structures need to be set on the pilot valve seat to achieve fluid connectivity, which will result in a relatively complex structure of the pilot valve seat. During the processing of the pilot valve seat, multiple positioning references need to be set when performing openings and other structures, resulting in a cumbersome processing process and affecting the overall manufacturing efficiency of the solenoid valve. Utility Model Content

[0004] The utility model provides a solenoid valve to solve the problem of complex processing of a pilot valve component in the prior art.

[0005] The utility model provides a solenoid valve, which comprises: a valve body assembly having a circulation cavity, the valve body assembly having a first valve port and a second valve port which are arranged oppositely, the first valve port, the circulation cavity and the second valve port being connected in sequence, the first valve port being connected to a first connecting pipe, and the second valve port being connected to a second connecting pipe; a piston assembly which is movably arranged in the circulation cavity, the piston assembly having a sealing end, the sealing end being able to move relative to the first valve port and the second valve port to block or open the first valve port and the second valve port, the piston assembly having a piston cavity; a pilot valve assembly which is arranged on the valve body assembly, the pilot valve assembly being used to control the pressure in the piston cavity, the pilot valve assembly The component comprises a pilot valve seat and a pilot valve cavity, the pilot valve cavity is connected with the piston cavity, a flow channel structure is arranged on the pilot valve seat, the pilot valve assembly further comprises a first flow channel and a second flow channel, the flow channel structure is respectively connected with the first flow channel, the second flow channel and the pilot valve cavity, one end of the first flow channel is used to be connected with the first connecting pipe, the other end of the first flow channel is connected with the pilot valve cavity through the flow channel structure, one end of the second flow channel is used to be connected with the second connecting pipe, the other end of the second flow channel is connected with the pilot valve cavity through the flow channel structure, along the plane where the axis of the pilot valve seat is located, the side of the pilot valve seat connected with the first connecting pipe and the side of the pilot valve seat connected with the second connecting pipe are symmetrically arranged with each other.

[0006] Furthermore, the pilot valve seat has a first communicating hole and a second communicating hole which are interconnected, one end of the first communicating hole is connected to the pilot valve cavity, the other end of the first communicating hole is connected to the side wall of the second communicating hole, and the two ends of the second communicating hole are respectively used to communicate with the first flow channel and the second flow channel, and the first communicating hole and the second communicating hole cooperate to form a flow channel structure.

[0007] Furthermore, the pilot valve assembly has a relatively set open state and a closed state, and the solenoid valve also includes a control assembly. When the pilot valve assembly is in the open state, the control assembly can control one of the first connecting pipe and the second connecting pipe to be connected to the pilot valve cavity, and the sealing end opens the first valve port and the second valve port; when the pilot valve assembly is in the closed state, the pilot valve cavity is not connected to the first connecting pipe and the second connecting pipe, and the sealing end blocks the first valve port and the second valve port.

[0008] Further, the control component includes: a first one-way valve, which is arranged between the first connecting pipe and the pilot valve chamber, and the first one-way valve is unidirectionally conducted from the second connecting hole to the direction of the first connecting pipe; a second one-way valve, which is arranged between the second connecting pipe and the pilot valve chamber, and the second one-way valve is unidirectionally conducted from the second connecting hole to the direction of the second connecting pipe; wherein, when the pilot valve assembly is switched to an open state, the first one-way valve connects the pilot valve chamber with the first flow channel, and the pilot valve chamber is not connected with the second flow channel, or, the second one-way valve connects the pilot valve chamber with the second flow channel, and the pilot valve chamber is not connected with the first flow channel.

[0009] Furthermore, a first mounting hole and a second mounting hole are provided on the pilot valve seat, the first mounting hole is used to install the first one-way valve, the second mounting hole is used to install the second one-way valve, and the first mounting hole and the second mounting hole are respectively provided at two ends of the second connecting hole.

[0010] Further, the first one-way valve has a first one-way valve core and a first one-way valve seat, and the first one-way valve seat is connected to the second connecting hole at one end thereof facing the guide valve seat, and the first one-way valve core is movably arranged in the first one-way valve seat, and the first one-way valve core can move toward one end of the first one-way valve seat toward the second connecting hole to block or open the first flow channel; the second one-way valve has a second one-way valve core and a second one-way valve seat, and the second one-way valve seat is connected to the second connecting hole at one end thereof facing the guide valve seat, and the second one-way valve core is movably arranged in the second one-way valve seat, and the second one-way valve core can move toward one end of the second one-way valve seat toward the second connecting hole to block or open the second flow channel.

[0011] Further, the outer diameter of the first one-way valve core is matched with the inner diameter of the first one-way valve seat, and the outer diameter of the second one-way valve core is matched with the inner diameter of the second one-way valve seat.

[0012] Furthermore, a connection structure is provided between the first one-way valve core and the second one-way valve core to fixedly connect the first one-way valve core and the second one-way valve core.

[0013] Furthermore, the solenoid valve also includes a first capillary and a second capillary, one end of the first capillary is connected to the first connecting pipe, and the other end is connected to the second connecting hole, the first capillary forms a first flow channel, one end of the second capillary is connected to the second connecting pipe, and the other end is connected to the second connecting hole, the second capillary forms a second flow channel.

[0014] Furthermore, the pilot valve seat is provided with a first plug hole and a second plug hole, the first plug hole is used to insert the first capillary tube, the second plug hole is used to insert the second capillary tube, and the first plug hole and the second plug hole are respectively arranged at two ends of the second connecting hole.

[0015] Furthermore, a first diameter-changing structure is provided on the first capillary tube, and the first diameter-changing structure is a flaring structure or a tapered structure, and the inner diameter of one end of the first capillary tube connected to the pilot valve seat is larger than the inner diameter of the middle pipeline of the first capillary tube; a second diameter-changing structure is provided on the second capillary tube, and the second diameter-changing structure is a flaring structure or a tapered structure, and the inner diameter of one end of the second capillary tube connected to the pilot valve seat is larger than the inner diameter of the middle pipeline of the second capillary tube.

[0016] Furthermore, the first capillary tube has a first main body tube and a first transfer tube which are interconnected, and the two ends of the first transfer tube are respectively connected to the pilot valve seat and the first main body tube, and the first main body tube has a first diameter-changing structure, and the first diameter-changing structure is a flaring structure; the second capillary tube has a second main body tube and a second transfer tube which are interconnected, and the two ends of the second transfer tube are respectively connected to the pilot valve seat and the second main body tube, and the second main body tube has a second diameter-changing structure, and the second diameter-changing structure is a flaring structure.

[0017] Furthermore, the first capillary tube has a first main body tube and a first transfer tube which are interconnected, and the two ends of the first transfer tube are respectively connected to the pilot valve seat and the first main body tube, and the first transfer tube has a first diameter-changing structure, which is a tapered structure; the second capillary tube has a second main body tube and a second transfer tube which are interconnected, and the two ends of the second transfer tube are respectively connected to the pilot valve seat and the second main body tube, and the second transfer tube has a second diameter-changing structure, which is a tapered structure.

[0018] By applying the technical solution of the utility model, the flow channel structure set on the pilot valve seat of the solenoid valve can be used to connect the first flow channel, the second flow channel and the pilot valve cavity respectively, so as to realize the connection function of the pilot valve seat. Specifically, the pilot valve seat is set to a symmetrical structure along the axis, that is, the pilot valve seat and the flow channel structure on the pilot valve seat are set to a symmetrical structure, so that it is convenient to use a fixture to clamp the pilot valve seat when processing the flow channel structure on the pilot valve seat, and it is convenient to position and process the pilot valve seat on the pilot valve seat, so as to facilitate the processing of the flow channel structure and the molding of the pilot valve seat, simplify the processing flow of the pilot valve seat, reduce the processing difficulty, and the symmetrical setting of the pilot valve seat is also conducive to improving the installation efficiency between the pilot valve seat and other components, and improving the overall manufacturing efficiency of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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:

[0020] Figure 1 The structure schematic diagram of the solenoid valve provided by the utility model when the fluid flows from the first connecting pipe to the second connecting pipe and the piston assembly is in a conducting state is shown;

[0021] 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;

[0022] Figure 3 Shows Figure 1 A partial enlarged view of the middle A;

[0023] 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 an open state;

[0024] 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;

[0025] Figure 6 Shows Figure 4 A partial enlarged view of point B in the middle;

[0026] Figure 7 The schematic diagram of the structure of the pilot valve seat provided by the utility model is shown;

[0027] Figure 8 It shows a schematic diagram of the structure of the cooperation between the pilot valve seat and the piston assembly provided by the utility model;

[0028] Fig. 9 The structure diagram of the piston assembly provided by the first embodiment of the utility model is shown;

[0029] Fig.10 A schematic structural diagram of a piston assembly provided in the second embodiment of the utility model is shown.

[0030] The above drawings include the following reference numerals:

[0031] 1. First takeover; 2. Second takeover;

[0032] 100, circulation chamber; 200, piston chamber; 300, pilot valve chamber;

[0033] 10. Valve body assembly; 101. First valve port; 102. Second valve port;

[0034] 20. Piston assembly;

[0035] 21. first piston; 201. first valve opening end surface;

[0036] 22. second piston; 202. second valve opening end surface;

[0037] 23. Piston sleeve; 24. Elastic member;

[0038] 30. pilot valve assembly; 301. first flow channel; 302. second flow channel; 303. pilot valve port;

[0039] 31. First one-way valve; 311. First one-way valve core; 312. First one-way valve seat;

[0040] 32. Second one-way valve; 321. Second one-way valve core; 322. Second one-way valve seat;

[0041] 33. Shell;

[0042] 34, pilot valve seat; 341, first mounting hole; 342, second mounting hole; 343, straight hole; 344, broken line flow channel; 347, first plug hole; 348, second plug hole;

[0043] 35. valve core assembly; 36. first communicating hole; 37. second communicating hole;

[0044] 41. a first capillary tube; 411. a first transfer tube; 412. a first main body tube;

[0045] 42. A second capillary tube; 421. A second transfer tube; 422. A second main tube. DETAILED DESCRIPTION

[0046] 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.

[0047] like Figures 1 to 9As shown, an 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 circulation chamber 100, and the valve body assembly 10 has a first valve port 101 and a second valve port 102 arranged opposite to each other. The first valve port 101, the circulation chamber 100 and the second valve port 102 are connected in sequence, the first valve port 101 is connected to a first connecting pipe 1, and the second valve port 102 is connected to a second connecting pipe 2. The piston assembly 20 is movably arranged in the circulation chamber 100, and the piston assembly 20 has a sealing end, which can move relative to the first valve port 101 and the second valve port 102 to block or open the first valve port 101 and the second valve port 102, and the piston assembly 20 has a piston chamber 200. The pilot valve assembly 30 is arranged on the valve body assembly 10. The pilot valve assembly 30 is used to control the pressure in the piston chamber 200. The pilot valve assembly 30 has a pilot valve seat 34 and a pilot valve chamber 300. The pilot valve chamber 300 is connected to the piston chamber 200. A flow channel structure is arranged on the pilot valve seat 34. The pilot valve assembly 30 also has a first flow channel 301 and a second flow channel 302. The flow channel structure is respectively connected to the first flow channel 301, the second flow channel 302 and the pilot valve chamber 300. One end of the first flow channel 301 is used to communicate with the first connecting pipe 1, and the other end of the first flow channel 301 is connected to the pilot valve chamber 300 through the flow channel structure. 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 chamber 300 through the flow channel structure. Along the plane where the axis of the pilot valve seat 34 is located, the side of the pilot valve seat 34 used to connect to the first connecting pipe 1 and the side of the pilot valve seat 34 used to connect to the second connecting pipe 2 are symmetrically arranged.

[0048] By applying the technical solution of the utility model, the flow channel structure provided on the pilot valve seat 34 of the solenoid valve can respectively connect the first flow channel 301, the second flow channel 302 and the pilot valve cavity 300, so as to realize the connection function of the pilot valve seat 34. Specifically, the pilot valve seat 34 is arranged along the axis, and the pilot valve seat 34 is arranged as a symmetrical structure, that is, the pilot valve seat 34 and the flow channel structure on the pilot valve seat 34 are arranged as symmetrical structures, so that it is convenient to clamp the pilot valve seat 34 with a fixture when processing the flow channel structure on the pilot valve seat 34, and it is convenient to position and process the pilot valve seat 34 on the pilot valve seat 34, so as to facilitate the processing of the flow channel structure and the molding of the pilot valve seat 34, simplify the processing flow of the pilot valve seat 34, reduce the processing difficulty, and the symmetrical arrangement of the pilot valve seat 34 is also conducive to improving the installation efficiency between the pilot valve seat 34 and other components, and improving the overall manufacturing efficiency of the solenoid valve.

[0049] Specifically, refer to Figure 3 , Figure 6 and Figure 7As shown, the pilot valve seat 34 has a first communicating hole 36 and a second communicating hole 37 that are connected to each other. One end of the first communicating hole 36 is connected to the pilot valve cavity 300, and the other end of the first communicating hole 36 is connected to the side wall of the second communicating hole 37. The two ends of the second communicating hole 37 are respectively used to communicate with the first flow channel 301 and the second flow channel 302. The first communicating hole 36 and the second communicating hole 37 cooperate to form a flow channel structure. Through the above arrangement, the flow channel structure formed by the first communicating hole 36 and the second communicating hole 37 can connect the pilot valve cavity 300, the first flow channel 301 and the second flow channel 302, and the second communicating hole 37 can be set to extend in a straight line, and the two ends are respectively used for communication, that is, only one processing is required on the pilot valve seat 34 for the structure that connects the first flow channel 301 and the second flow channel 302, which reduces the processing difficulty and improves the production efficiency.

[0050] Specifically, the axis of the first communicating hole 36 may be arranged to intersect with the perpendicular midline of the second communicating hole 37 , so as to facilitate the positioning of the first communicating hole 36 and the second communicating hole 37 .

[0051] In the present application, the pilot valve assembly 30 has an open state and a closed state that are relatively set, and the solenoid valve also includes a control assembly. When the pilot valve assembly 30 is in the open state, the control assembly can control one of the first connecting pipe 1 and the second connecting pipe 2 to communicate with the pilot valve cavity 300, and the sealing end opens the first valve port 101 and the second valve port 102; when the pilot valve assembly 30 is in the closed state, the pilot valve cavity 300 is not connected with the first connecting pipe 1 and the second connecting pipe 2, and the sealing end blocks the first valve port 101 and the second valve port 102. Through the above settings, the control assembly can control the communication state of the first flow channel 301 and the second flow channel 302 with the pilot valve cavity 300 when the pilot valve assembly 30 is in the open state, so as to realize the control function of the pilot valve assembly 30.

[0052] Specifically, the pilot valve assembly 30 further includes a housing 33, a pilot valve seat 34 and a valve core assembly 35. The pilot valve seat 34 is disposed on the piston assembly 20, and the pilot valve seat 34 and the housing 33 cooperate to form a pilot valve cavity 300, and an end of the first communication hole 36 away from the second communication hole 37 forms a pilot valve port 303, and the first flow channel 301 and the second flow channel 302 are both connected to the pilot valve cavity 300 through the pilot valve port 303. The valve core assembly 35 is movably disposed in the pilot valve cavity 300, and the valve core assembly 35 can block or open the pilot valve port 303, so that the pilot valve assembly 30 is switched between an open state and a closed state.

[0053] Specifically, the control assembly includes a first one-way valve 31 and a second one-way valve 32. The first one-way valve 31 is arranged between the first connecting pipe 1 and the pilot valve chamber 300, and the first one-way valve 31 is unidirectionally connected to the direction of the first connecting pipe 1 by the second connecting hole 37. The second one-way valve 32 is arranged between the second connecting pipe 2 and the pilot valve chamber 300, and the second one-way valve 32 is unidirectionally connected to the direction of the second connecting pipe 2 by the second connecting hole 37. 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 to 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 to 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.

[0054] Specifically, Figure 7 As shown, the pilot valve seat 34 is provided with a first mounting hole 341 and a second mounting hole 342, the first mounting hole 341 is used to install the first one-way valve 31, the second mounting hole 342 is used to install the second one-way valve 32, and the first mounting hole 341 and the second mounting hole 342 are respectively arranged at both ends of the second connecting hole 37. Specifically, in the present application, the first mounting hole 341 and the second mounting hole 342 are respectively arranged at both ends of the second connecting hole 37, and are respectively used to accommodate the first one-way valve 31 and the second one-way valve 32, which can facilitate the positioning and installation of the first one-way valve 31 and the second one-way valve 32, and can ensure the stability of the installation. In addition, it can also facilitate the processing and positioning of the first mounting hole 341 and the second mounting hole 342, and facilitate the processing of the pilot valve seat 34.

[0055] Reference Figure 3 and Figure 6As shown, the first one-way valve 31 has a first one-way valve core 311 and a first one-way valve seat 312, and the first one-way valve seat 312 is connected to the pilot valve chamber 300 at one end facing the second connecting hole 37, and the first one-way valve core 311 is movably arranged in the first one-way valve seat 312, and the first one-way valve core 311 can move toward one end of the first one-way valve seat 312 toward the second connecting hole 37 to block or open the second connecting hole 37; the second one-way valve 32 has a second one-way valve core 321 and a second one-way valve seat 322, and the second one-way valve seat 322 is connected to the pilot valve chamber 300 at one end facing the second connecting hole 37, and the second one-way valve core 321 is movably arranged in the second one-way valve seat 322, and the second one-way valve core 321 can move toward one end of the second one-way valve seat 322 toward the second connecting hole 37 to block or open the second connecting hole 37. Through the above arrangement, the first one-way valve core 311 and the second one-way valve core 321 can realize the control of the second communicating hole 37 being connected to the first flow channel 301 or the second flow channel 302 .

[0056] Specifically, in the present application, the outer diameter of the first one-way valve core 311 is matched with the inner diameter of the first one-way valve seat 312, and the outer diameter of the second one-way valve core 321 is matched with the inner diameter of the second one-way valve seat 322. That is, there is a clearance fit between the first one-way valve core 311 and the first one-way valve seat 312, and between the second one-way valve core 321 and the second one-way valve seat 322, and the first one-way valve core 311 can move in the first one-way valve seat 312 under the drive of the fluid, and the second one-way valve core 321 can move in the second one-way valve seat 322 under the drive of the fluid.

[0057] Furthermore, a plurality of first openings are annularly spaced apart on the side wall of the first one-way valve seat 312, and the first openings are connected to the first flow channel 301. When the first one-way valve core 311 moves toward the second connecting hole 37 and blocks the second connecting hole 37 under the drive of the fluid, the plurality of first openings cannot be connected to the pilot valve chamber 300 through the second connecting hole 37; when the first one-way valve core 311 moves away from the second connecting hole 37 and opens the second connecting hole 37 under the drive of the fluid, the plurality of first openings are connected to the pilot valve chamber 300 through the second connecting hole 37, thereby realizing the one-way conduction of the first one-way valve 31 toward the first connecting pipe 1. A plurality of second openings are arranged at annular intervals on the side wall of the second one-way valve seat 322, and the second openings are connected to the second flow channel 302. When the second one-way valve core 321 moves toward the second connecting hole 37 and blocks the second connecting hole 37 driven by the fluid, the plurality of second openings cannot be connected to the pilot valve chamber 300 through the second connecting hole 37; when the second one-way valve core 321 moves away from the second connecting hole 37 and opens the second connecting hole 37 driven by the fluid, the plurality of second openings are connected to the pilot valve chamber 300 through the second connecting hole 37, thereby realizing the one-way conduction of the second one-way valve 32 toward the second connecting pipe 2.

[0058] In some feasible embodiments of the present application, a connection structure is provided between the first one-way valve core 311 and the second one-way valve core 321 to fix the first one-way valve core 311 and the second one-way valve core 321. Through the above arrangement, the consistency of the actions of the first one-way valve core 311 and the second one-way valve core 321 during the switching process is improved. Specifically in the present application, Figure 8 As shown, the piston assembly 20 includes a first piston 21, a second piston 22, a piston sleeve 23 and an elastic member 24. The piston sleeve 23 is disposed in the circulation chamber 100, the first piston 21 and the second piston 22 are both movably disposed in the piston sleeve 23, the end of the first piston 21 away from the second piston 22 forms a first sealing end, the first end of the second piston 22 away from the first piston 21 forms a second sealing end, the first piston 21, the second piston 22 and the inner wall of the piston sleeve 23 cooperate to form a piston chamber 200, the elastic member 24 is disposed between the first piston 21 and the second piston 22, and the elastic member 24 can provide the first piston 21 and the second piston 22 with an elastic force to move away from each other. The piston chamber 200 can be connected to the pilot valve chamber 300 through the flow channel structure.

[0059] Specifically, the connection structure provided between the first one-way valve core 311 and the second one-way valve core 321 may be a rigid connection member such as a connection rod.

[0060] Furthermore, the flow channel structure further includes a communication channel, one end of which is communicated with the pilot valve chamber 300 , and the other end of which is communicated with the piston chamber 200 .

[0061] Reference Fig. 9 As shown, in the first embodiment of the present application, a straight hole 343 is provided on the pilot valve seat 34 , and the straight hole 343 forms a connecting channel to connect the pilot valve chamber 300 with the piston chamber 200 . Such a configuration has a simple structure and is convenient for processing the pilot valve seat 34 .

[0062] refer to Fig.10 As shown, in the second embodiment of the present application, a zigzag flow channel 344 is provided on the pilot valve seat 34, and the zigzag flow channel 344 forms a connecting channel. One end of the zigzag flow channel 344 is connected to the pilot valve cavity 300, and the other end is connected to the pilot valve cavity 300. The port of the zigzag flow channel 344 away from one end of the pilot valve cavity 300 is coaxially arranged with the outer periphery of the pilot valve seat 34 to facilitate the processing and positioning of the zigzag flow channel 344. The port of the zigzag flow channel 344 close to one end of the pilot valve cavity 300 is not coaxial with the outer periphery of the pilot valve seat 34 to avoid the pilot valve port 303.

[0063] 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.

[0064] 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 a configuration is conducive to guiding 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 cavity, thereby reducing the flow resistance.

[0065] In a feasible embodiment of the present application, when the solenoid valve switches from a closed state to an open state, the switching action of the piston assembly 20 is as follows:

[0066] Reference Figures 1 to 3As 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. When the pilot valve assembly 30 is switched to the open state, the first one-way 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 one-way 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 through the connecting channel and the pilot valve chamber 300, 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, and the pressure on the first piston 21 from the first connecting pipe 1 is greater than the pressure on the piston chamber 200 and Due to the pressure of the elastic member 24, the first piston 21 moves 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 on 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 sum of the pressure in the piston chamber 200 and the pressure of the elastic member 24, the second piston 22 can move away from the second valve port 102 under the drive of 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.

[0067] Reference Figures 4 to 6 As 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, and when 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, and the second flow channel 302 is not connected to the pilot valve chamber 300, and the first one-way valve 31 on the first flow channel 301 is opened, and the pilot valve chamber 300 is connected to the first flow channel 301, and the piston chamber 200 can be connected to the first flow channel 301 through the connecting channel and the pilot valve chamber 300, and 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, and the pressure on the second piston 22 by the second connecting pipe 2 is greater than the pressure on the piston chamber 200 and Due to the pressure of the elastic member 24, the second piston 22 moves in the 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 the direction away from the first valve port 101. The pressure of the fluid applied to the end of the first piston 21 is greater than the sum of the pressure in the piston chamber 200 and the pressure of the elastic member 24. The first piston 21 can move in the direction away from the first valve port 101 under the drive of the pressure difference, the first valve port 101 opens, the piston assembly 20 switches to the conduction state, and the fluid can flow from the second connecting pipe 2 to the first connecting pipe 1 through the circulation chamber 100.

[0068] Specifically, there is a balance channel between the piston chamber 200 and the circulation chamber 100 to connect the piston chamber 200 and the circulation chamber 100. Through the above arrangement, when the valve is closed, the fluid in the circulation chamber 100 can enter the piston chamber 200 through the balance channel to avoid the piston chamber 200 from being suffocated and affecting the valve closing. In the above process, 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, and the first piston 21 is subjected to a greater pressure, and the first piston 21 will open the first valve port 101 before the second piston 22; 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, and the second piston 22 is subjected to a greater pressure, and the second piston 22 will open the second valve port 102 before the first piston 21, so that the fluid can flow into the valve body assembly 10 faster.

[0069] 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:

[0070] Reference Figures 1 to 6 As shown, the pilot valve assembly 30 is switched to a 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 a blocked state, the first piston 21 blocks the first valve port 101, the second piston 22 blocks the second valve port 102, and the first connecting pipe 1 and the second connecting pipe 2 are not connected to the circulation chamber 100.

[0071] Further, the solenoid valve further includes a first capillary tube 41 and a second capillary tube 42, one end of the first capillary tube 41 is connected to the first connecting pipe 1, and the other end is connected to the second connecting hole 37, the first capillary tube 41 forms a first flow channel 301, one end of the second capillary tube 42 is connected to the second connecting pipe 2, and the other end is connected to the second connecting hole 37, the second capillary tube 42 forms a second flow channel 302. By providing the first capillary tube 41, the first connecting pipe 1 can be connected to the pilot valve chamber 300, and the second capillary tube 42 can be connected to the second connecting pipe 2 and the pilot valve chamber 300, so as to meet the circulation of the fluid.

[0072] In this application, if Figure 7As shown, the pilot valve seat 34 is provided with a first plug hole 347 and a second plug hole 348, the first plug hole 347 is used to insert the first capillary tube 41, the second plug hole 348 is used to insert the second capillary tube 42, and the first plug hole 347 and the second plug hole 348 are respectively arranged at both ends of the second connecting hole 37. Through the above arrangement, it is possible to facilitate the connection between the first capillary tube 41 and the second capillary tube 42 and the pilot valve seat 34, and by respectively arranging the first plug hole 347 and the second plug hole 348 at both ends of the second connecting hole 37, it is possible to provide a positioning basis for the processing of the first plug hole 347 and the second plug hole 348, so as to facilitate the processing of the first plug hole 347 and the second plug hole 348, and further improve the processing efficiency of the pilot valve seat 34.

[0073] Specifically in the present application, a first diameter-reducing structure is provided on the first capillary tube 41, and the first diameter-reducing structure is a flaring structure or a tapering structure, and the inner diameter of one end of the first capillary tube 41 used for connecting with the pilot valve seat 34 is larger than the inner diameter of the middle pipeline of the first capillary tube 41; a second diameter-reducing structure is provided on the second capillary tube 42, and the second diameter-reducing structure is a flaring structure or a tapering structure, and the inner diameter of one end of the second capillary tube 42 used for connecting with the pilot valve seat 34 is larger than the inner diameter of the middle pipeline of the second capillary tube 42. Through the above-mentioned configuration, by providing the first diameter-reducing structure and the second diameter-reducing structure, the pilot valve seat 34 can be adapted to the first capillary tube 41 and the second capillary tube 42 of various specifications, thereby improving the standardization degree of the pilot valve seat 34.

[0074] In one embodiment of the present application, the first capillary 41 has a first body tube 412 and a first transfer tube 411 that are interconnected, and the two ends of the first transfer tube 411 are respectively connected to the pilot valve seat 34 and the first body tube 412, and the first body tube 412 has a first diameter-changing structure, which is a flaring structure; the second capillary 42 has a second body tube and a second transfer tube 421 that are interconnected, and the two ends of the second transfer tube 421 are respectively connected to the pilot valve seat 34 and the second body tube 422, and the second body tube 422 has a second diameter-changing structure, which is a flaring structure. Through the above arrangement, the first transfer tube 411 and the second transfer tube 421 can play a connecting role, which facilitates the first capillary 41 and the second capillary 42 to connect to the pilot valve seat 34, and can make the first capillary 41 and the second capillary 42 of different sizes fit the same pilot valve seat 34, so that when processing and producing solenoid valves of different specifications, there is no need to process a plurality of pilot valve seats 34 of different sizes, thereby improving the processing efficiency of the solenoid valve.

[0075] In another embodiment of the present application, refer to Figure 6As shown, the first capillary tube 41 has a first main body tube 412 and a first transfer tube 411 which are interconnected, and the two ends of the first transfer tube 411 are respectively connected to the pilot valve seat 34 and the first main body tube 412, and the first transfer tube 411 has a first diameter-changing structure, which is a tapered structure; the second capillary tube 42 has a second main body tube 422 and a second transfer tube 421 which are interconnected, and the two ends of the second transfer tube 421 are respectively connected to the pilot valve seat 34 and the second main body tube 422, and the second transfer tube 421 has a second diameter-changing structure, which is a tapered structure. Through the above arrangement, the processing and forming of the first capillary tube 41 and the second capillary tube 42 can be facilitated, and the pilot valve seats 34 of different sizes can be adapted by only replacing the first transfer tube 411 and the second transfer tube 421.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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), the valve body assembly (10) having a first valve port (101) and a second valve port (102) arranged opposite to each other, the first valve port (101), the circulation cavity (100) and the second valve port (102) being connected in sequence, the first valve port (101) being connected to a first connecting pipe (1), and the second valve port (102) being connected to a second connecting pipe (2); A piston assembly (20) is movably arranged in the circulation chamber (100), the piston assembly (20) having a sealing end, the sealing end being movable relative to the first valve port (101) and the second valve port (102) to block or open the first valve port (101) and the second valve port (102), the piston assembly (20) having a piston chamber (200); A pilot valve assembly (30) is arranged on the valve body assembly (10), the pilot valve assembly (30) is used to control the pressure in the piston chamber (200), the pilot valve assembly (30) comprises a pilot valve seat (34) and a pilot valve chamber (300), the pilot valve chamber (300) is communicated with the piston chamber (200), a flow channel structure is arranged on the pilot valve seat (34), the pilot valve assembly (30) further comprises a first flow channel (301) and a second flow channel (302), the flow channel structure is communicated with the first flow channel (301), the second flow channel (302) and the pilot valve chamber (300), the first One end of the flow channel (301) is used to communicate with the first connecting pipe (1), and the other end of the first flow channel (301) is connected to the pilot valve chamber (300) through the flow channel structure. 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 chamber (300) through the flow channel structure. Along the plane where the axis of the pilot valve seat (34) is located, the side of the pilot valve seat (34) connected to the first connecting pipe (1) and the side of the pilot valve seat (34) connected to the second connecting pipe (2) are symmetrically arranged.

2. The solenoid valve according to claim 1, characterized in that: The pilot valve seat (34) has a first communicating hole (36) and a second communicating hole (37) which are connected to each other. One end of the first communicating hole (36) is connected to the pilot valve chamber (300), and the other end of the first communicating hole (36) is connected to the side wall of the second communicating hole (37). The two ends of the second communicating hole (37) are respectively used to communicate with the first flow channel (301) and the second flow channel (302). The first communicating hole (36) and the second communicating hole (37) cooperate to form the flow channel structure.

3. The solenoid valve according to claim 2, characterized in that: The pilot valve assembly (30) has an open state and a closed state that are relatively arranged. The solenoid valve also includes a control assembly. When the pilot valve assembly (30) is in the open state, the control assembly can control one of the first connecting pipe (1) and the second connecting pipe (2) to communicate with the pilot valve cavity (300), and the sealing end opens the first valve port (101) and the second valve port (102); when the pilot valve assembly (30) is in the closed state, the pilot valve cavity (300) is not in communication with the first connecting pipe (1) and the second connecting pipe (2), and the sealing end blocks the first valve port (101) and the second valve port (102).

4. The solenoid valve according to claim 3, characterized in that: The control component comprises: a first one-way valve (31), the first one-way valve (31) being arranged between the first connecting pipe (1) and the pilot valve chamber (300), the first one-way valve (31) being unidirectionally conducted from the second communicating hole (37) toward the first connecting pipe (1); a second one-way valve (32), the second one-way valve (32) being arranged between the second connecting pipe (2) and the pilot valve chamber (300), the second one-way valve (32) being unidirectionally conducted from the second communicating hole (37) to the second connecting pipe (2); Wherein, 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).

5. The solenoid valve according to claim 4, characterized in that: The pilot valve seat (34) is provided with a first mounting hole (341) and a second mounting hole (342); the first mounting hole (341) is used for mounting the first one-way valve (31); the second mounting hole (342) is used for mounting the second one-way valve (32); the first mounting hole (341) and the second mounting hole (342) are respectively arranged at two ends of the second connecting hole (37).

6. The solenoid valve according to claim 4, characterized in that: The first one-way valve (31) comprises a first one-way valve core (311) and a first one-way valve seat (312); one end of the first one-way valve seat (312) facing the second communicating hole (37) is connected to the pilot valve chamber (300); the first one-way valve core (311) is movably arranged in the first one-way valve seat (312); the first one-way valve core (311) can move toward one end of the first one-way valve seat (312) facing the second communicating hole (37) to block or open the second communicating hole (37); The second one-way valve (32) comprises a second one-way valve core (321) and a second one-way valve seat (322); one end of the second one-way valve seat (322) facing the second connecting hole (37) is connected to the pilot valve chamber (300); the second one-way valve core (321) is movably arranged in the second one-way valve seat (322); the second one-way valve core (321) can move toward one end of the second one-way valve seat (322) facing the second connecting hole (37) to block or open the second connecting hole (37).

7. The solenoid valve according to claim 6, characterized in that: The outer diameter of the first one-way valve core (311) is matched to the inner diameter of the first one-way valve seat (312), and the outer diameter of the second one-way valve core (321) is matched to the inner diameter of the second one-way valve seat (322).

8. The solenoid valve according to claim 6, characterized in that: A connection structure is provided between the first one-way valve core (311) and the second one-way valve core (321) so as to fixedly connect the first one-way valve core (311) and the second one-way valve core (321).

9. The solenoid valve according to claim 2, characterized in that: The solenoid valve further comprises a first capillary tube (41) and a second capillary tube (42); one end of the first capillary tube (41) is connected to the first connecting tube (1), and the other end is connected to the second connecting hole (37); the first capillary tube (41) forms the first flow channel (301); one end of the second capillary tube (42) is connected to the second connecting tube (2), and the other end is connected to the second connecting hole (37); the second capillary tube (42) forms the second flow channel (302).

10. The solenoid valve according to claim 9, characterized in that: The pilot valve seat (34) is provided with a first plug hole (347) and a second plug hole (348); the first plug hole (347) is used for inserting the first capillary tube (41); the second plug hole (348) is used for inserting the second capillary tube (42); the first plug hole (347) and the second plug hole (348) are respectively arranged at two ends of the second connecting hole (37).

11. The solenoid valve according to claim 9, characterized in that: The first capillary tube (41) is provided with a first diameter-changing structure, the first diameter-changing structure is a flaring structure or a tapering structure, and the inner diameter of one end of the first capillary tube (41) used for connecting with the pilot valve seat (34) is larger than the inner diameter of the middle pipeline of the first capillary tube (41); the second capillary tube (42) is provided with a second diameter-changing structure, the second diameter-changing structure is a flaring structure or a tapering structure, and the inner diameter of one end of the second capillary tube (42) used for connecting with the pilot valve seat (34) is larger than the inner diameter of the middle pipeline of the second capillary tube (42).

12. The solenoid valve according to claim 11, characterized in that: The first capillary tube (41) comprises a first main body tube (412) and a first transfer tube (411) which are interconnected, and two ends of the first transfer tube (411) are respectively connected to the pilot valve seat (34) and the first main body tube (412), and the first main body tube (412) has the first diameter-changing structure, which is a flaring structure; the second capillary tube (42) comprises a second main body tube (422) and a second transfer tube (421) which are interconnected, and two ends of the second transfer tube (421) are respectively connected to the pilot valve seat (34) and the second main body tube (422), and the second main body tube (422) has the second diameter-changing structure, which is a flaring structure.

13. The solenoid valve according to claim 11, characterized in that: The first capillary tube (41) comprises a first main body tube (412) and a first transfer tube (411) which are interconnected, and two ends of the first transfer tube (411) are respectively connected to the pilot valve seat (34) and the first main body tube (412), and the first transfer tube (411) has the first diameter-changing structure, which is a tapered structure; the second capillary tube (42) comprises a second main body tube (422) and a second transfer tube (421) which are interconnected, and two ends of the second transfer tube (421) are respectively connected to the pilot valve seat (34) and the second main body tube (422), and the second transfer tube (421) has the second diameter-changing structure, which is a tapered structure.

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