One-way valve, pilot valve assembly and two-way solenoid valve

Abstract

The utility model provides a one -way valve, pilot valve subassembly and two -way electromagnetic valve, one -way valve includes valve body structure, stop structure and sealed ball, stop structure sets up one end of valve body structure, the other end of valve body structure has one -way mouth, sealed ball activity sets up in the cavity of valve body structure, to open and close one -way mouth, stop structure is limited to sealed ball to the movement of far -away one -way mouth direction, wherein, sealed ball closes one -way mouth, the diameter ratio of one -way mouth and sealed ball adhesion place and sealed ball's diameter is 3:8~5:8. Limit the diameter ratio of one -way mouth and sealed ball adhesion place and sealed ball's diameter in above -mentioned range, when sealed ball closes one -way mouth, the surface of sealed ball and the inner surface of one -way mouth can better contact, thereby has improved the sealing effect of one -way valve.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and more specifically, to a one-way valve, a pilot valve assembly, and a two-way solenoid valve. Background Technology

[0002] Some solenoid valves have a check valve installed inside them to perform specific functions. Due to space limitations, the check valve installed inside the solenoid valve cannot be too complex and usually adopts a relatively simple structure. Such a check valve has poor sealing performance when closed, affecting its performance. Utility Model Content

[0003] This invention provides a one-way valve, a pilot valve assembly, and a two-way solenoid valve to solve the problem of poor sealing performance of one-way valves.

[0004] To address the aforementioned problems, according to one aspect of this utility model, some embodiments of this utility model provide a one-way valve, including a valve body structure, a stop structure, and a sealing ball. The stop structure is disposed at one end of the valve body structure, and the other end of the valve body structure has a one-way port. The sealing ball is movably disposed within the cavity of the valve body structure to open and close the one-way port. The stop structure limits the movement of the sealing ball away from the one-way port. When the sealing ball closes the one-way port, the ratio of the diameter of the contact point between the one-way port and the sealing ball to the diameter of the sealing ball is 3:8 to 5:8.

[0005] In some embodiments, the end of the one-way opening facing the sealing ball has a concave surface, and the diameter of the concave surface gradually decreases in the direction in which the sealing ball faces the one-way opening; when the sealing ball closes the one-way opening, the outer surface of the sealing ball and the concave surface are in contact.

[0006] In some embodiments, the end of the one-way opening facing the sealing ball has a sealing cone surface, the diameter of which gradually decreases in the direction of the sealing ball toward the one-way opening; when the sealing ball closes the one-way opening, the outer surface of the sealing ball is tangent to the sealing cone surface, and the cone angle of the sealing cone surface is 100°~140°.

[0007] In some embodiments, the valve body structure has an opening at one end away from the one-way port, and the stop structure is an annular retaining ring, which is fixed inside the opening of the valve body structure.

[0008] In some embodiments, the valve body structure has a limiting step in the opening, and the end face of the annular retaining ring abuts against the limiting step; the annular retaining ring and the valve body structure are interference-fitted, or the annular retaining ring and the valve body structure are welded.

[0009] In some embodiments, the inner end of the annular retaining ring has a rounded corner or a chamfer.

[0010] In some embodiments, the sidewall of the valve body structure has a plurality of flow holes distributed circumferentially, each of the flow holes communicating with a cavity within the valve body structure, and the sum of the flow areas of the plurality of flow holes being greater than or equal to the flow area of ​​the one-way port.

[0011] In some embodiments, the valve body structure has an opening, one end of which is connected to the one-way port, and the other end of which is connected to the outside of the one-way valve. The flow area of ​​the opening is smaller than the flow area of ​​the one-way port.

[0012] In some embodiments, the valve body structure has a material reservoir at one end, the material reservoir being connected to the end of the opening away from the one-way port, and the diameter of the material reservoir being larger than the diameter of the opening.

[0013] According to another aspect of the present invention, a pilot valve assembly is provided, the pilot valve assembly including a pilot valve seat, a capillary tube and the aforementioned one-way valve, the pilot valve seat having a pilot valve channel and a mounting groove, the end of the pilot valve channel having an openable and closable pilot valve port, the one-way valve being installed in the mounting groove, and one end of the capillary tube being installed in the mounting groove; wherein, when the one-way port of the one-way valve is open, the one-way port and the channel in the capillary tube are in communication.

[0014] In some embodiments, at least a portion of the one-way valve extends into the capillary tube, and the area between the outer peripheral surface of the one-way valve and the inner peripheral surface of the capillary tube is a capillary channel. The sidewall of the valve body structure has a plurality of flow holes distributed circumferentially, and each flow hole communicates with the cavity inside the valve body structure and the capillary channel. The flow area of ​​the capillary channel is greater than or equal to the sum of the flow areas of the plurality of flow holes, and the sum of the flow areas of the plurality of flow holes is greater than or equal to the flow area of ​​the one-way port.

[0015] According to another aspect of the present invention, a bidirectional solenoid valve is provided, the bidirectional solenoid valve comprising a main valve assembly, a piston assembly and the aforementioned pilot valve assembly; The main valve assembly has a piston chamber, a first valve port and a second valve port disposed opposite to each other, the first valve port being connected to a first connecting pipe, and the second valve port being connected to a second connecting pipe. The piston assembly is movably disposed within the piston chamber. When the piston assembly is in a blocking state, it blocks the first valve port and the second valve port. When the piston assembly is in a conducting state, the first valve port and the second valve port are connected. The pilot valve seat is installed on the main valve assembly. The pilot valve assembly includes two check valves and two capillary tubes. The two capillary tubes are a first capillary tube and a second capillary tube, respectively. The first capillary tube is connected to the first connecting pipe, and the second capillary tube is connected to the second connecting pipe. When the pilot valve port of the pilot valve seat is open, the pilot valve channel and the piston chamber are connected, and one of the first capillary tube and the second capillary tube is connected to the pilot valve channel in one direction through the corresponding one-way valve, and the piston assembly is in the conducting state; when the pilot valve port is closed, the pilot valve channel and the piston chamber are not connected, and the piston assembly is in the blocking state.

[0016] In some embodiments, the main valve assembly has an outer valve chamber located outside the piston assembly and the piston chamber, the piston assembly comprising: Both the first piston and the second piston are movably disposed within the piston chamber. The first piston is used to open and close the first valve port, and the second piston is used to open and close the second valve port. The end of the first piston has a first channel for communicating with the outer valve chamber, and the end of the second piston has a second channel for communicating with the outer valve chamber. An elastic element is disposed between the first piston and the second piston, the elastic element providing an elastic force that pushes the first piston and the second piston away from each other; A third check valve and a fourth check valve are provided. The third check valve is installed inside the first piston, and the fourth check valve is installed inside the second piston. The third check valve is used to connect the first channel and the piston chamber in one direction, and the fourth check valve is used to connect the second channel and the piston chamber in one direction.

[0017] In some embodiments, the third check valve and the fourth check valve have the same structure. The third check valve includes a valve body structure, a stop structure, and a sealing ball. The stop structure is disposed at one end of the valve body structure, and the other end of the valve body structure has a one-way port. The sealing ball is movably disposed within the cavity of the valve body structure to open and close the one-way port. The stop structure limits the movement of the sealing ball away from the one-way port. The valve body structure has an opening, one end of which communicates with the one-way port, and the other end of which communicates with the first channel. The first piston has a mating groove, and the end of the valve body structure with the opening is fixed in the mating groove by welding or interference fit.

[0018] In this check valve, a sealing ball is movably disposed within the cavity of the valve body structure to open and close the one-way port. A stop structure limits the movement of the sealing ball away from the one-way port. When the sealing ball closes the one-way port, the ratio of the diameter of the contact area between the one-way port and the sealing ball to the diameter of the sealing ball is 3:8 to 5:8. By limiting the ratio of the diameter of the contact area between the one-way port and the sealing ball to the diameter of the sealing ball to the diameter of the sealing ball, the surface of the sealing ball and the inner surface of the one-way port can make better contact when the sealing ball closes the one-way port, thereby improving the sealing effect of the check valve. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 A schematic diagram of a one-way valve provided in an embodiment of the present invention is shown; Figure 2 A schematic diagram of the valve body structure in the one-way valve provided in an embodiment of the present invention is shown; Figure 3 A schematic diagram of a one-way valve provided in an embodiment of the present invention is shown; Figure 4 A schematic diagram of the pilot valve assembly provided in an embodiment of the present invention is shown; Figure 5 A schematic diagram of a bidirectional solenoid valve provided in an embodiment of the present invention is shown; Figure 6 Another schematic diagram of a bidirectional solenoid valve provided in an embodiment of the present invention is shown; Figure 7 A schematic diagram of a portion of the structure of a two-way solenoid valve is shown.

[0020] The above figures include the following reference numerals: 100. Check valve; 101. Check port; 110. Valve body structure; 111. Limiting step; 112. Flow hole; 113. Opening; 114. Material reservoir; 120. Stop structure; 130. Sealing ball; 200, Pilot valve assembly; 201, Capillary channel; 210, Pilot valve seat; 211, Pilot valve passage; 221, First capillary tube; 222, Second capillary tube; 300. Main valve assembly; 301. Piston chamber; 302. First valve port; 303. Second valve port; 311. First connecting pipe; 312. Second connecting pipe; 321. Outer valve chamber; 400 Piston assembly; 410 First piston; 411 First channel; 412 Mating groove; 420 Second piston; 421 Second channel; 430 Elastic element; 440 Third check valve; 450 Fourth check valve. Detailed Implementation

[0021] The technical solutions in at least one embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one embodiment is merely illustrative and is not intended to limit this application or its applications. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application.

[0022] like Figures 1 to 3 As shown, an embodiment of this utility model provides a one-way valve, including a valve body structure 110, a stop structure 120, and a sealing ball 130. The stop structure 120 is disposed at one end of the valve body structure 110, and the other end of the valve body structure 110 has a one-way port 101. The sealing ball 130 is movably disposed in the cavity of the valve body structure 110 to open and close the one-way port 101. The stop structure 120 limits the movement of the sealing ball 130 away from the one-way port 101. When the sealing ball 130 closes the one-way port 101, the ratio of the diameter of the contact point between the one-way port 101 and the sealing ball 130 to the diameter of the sealing ball 130 is 3:8 to 5:8.

[0023] The diameter of the contact point between the one-way port 101 and the sealing ball 130 is the diameter of the circle formed by the one-way port 101 and the sealing ball 130 at the contact point, or the minimum diameter of the annular area formed at the contact point.

[0024] In this one-way valve, a sealing ball 130 is movably disposed within the cavity of the valve body structure 110 to open and close the one-way port 101. A stop structure 120 limits the movement of the sealing ball 130 away from the one-way port 101. By limiting the ratio of the diameter of the contact point between the one-way port 101 and the sealing ball 130 to the diameter of the sealing ball 130 within the aforementioned range, when the sealing ball 130 closes the one-way port 101, the surface of the sealing ball 130 and the inner surface of the one-way port 101 can make better contact, thereby improving the sealing effect of the one-way valve. In one embodiment, the ratio of the diameter of the contact point between the one-way port 101 and the sealing ball 130 to the diameter of the sealing ball 130 is 1:2.

[0025] like Figure 1As shown, in some embodiments, the end of the one-way port 101 facing the sealing ball 130 has a concave surface, the diameter of which gradually decreases in the direction of the sealing ball 130 towards the one-way port 101; when the one-way port 101 is closed, the outer surface of the sealing ball 130 and the concave surface are in contact. The concave surface of the end of the one-way port 101 facing the sealing ball 130 matches the outer surface of the sealing ball 130. Thus, when the one-way port 101 is closed, the outer surface of the sealing ball 130 and the concave surface are in contact, improving the sealing effect.

[0026] like Figure 2 As shown, in some embodiments, the end of the one-way port 101 facing the sealing ball 130 has a sealing cone surface, the diameter of which gradually decreases in the direction of the sealing ball 130 toward the one-way port 101. When the one-way port 101 is closed by the sealing ball 130, the outer surface of the sealing ball 130 is tangent to the sealing cone surface, and the cone angle of the sealing cone surface is 100°~140°. Thus, when the one-way port 101 is closed by the sealing ball 130, the outer surface of the sealing ball 130 and the sealing cone surface remain in contact to ensure a sealing effect. The cone angle of the sealing cone surface is 100°~140°, so the contact position between the outer surface of the sealing ball 130 and the sealing cone surface is located in the middle of the sealing cone surface, further improving the sealing effect.

[0027] like Figure 1 As shown, the valve body structure 110 has an opening at the end away from the one-way port 101, and the stop structure 120 is an annular retaining ring, which is fixed inside the opening of the valve body structure 110. Installing the annular retaining ring at the end of the valve body structure 110 away from the one-way port 101 does not cause deformation of the valve body structure 110 and does not affect its performance.

[0028] like Figure 2 As shown, the valve body structure 110 has a limiting step 111 inside its opening, and the end face of the annular retaining ring abuts against the limiting step 111. The limiting step 111 limits the depth to which the annular retaining ring is inserted into the opening of the valve body structure 110. In some embodiments, the annular retaining ring and the valve body structure 110 are interference-fitted. Alternatively, in some embodiments, the annular retaining ring and the valve body structure 110 are welded.

[0029] In some embodiments, the inner diameter of the annular retaining ring is less than or equal to the radius of the sealing ball 130. This prevents the sealing ball 130 from being too small and getting stuck in the inner hole of the annular retaining ring.

[0030] In some embodiments, the annular retaining ring has a radial symmetry plane perpendicular to its axial direction, which divides the annular retaining ring into two symmetrical parts. This allows for installation of the annular retaining ring without needing to distinguish direction; either end of the annular retaining ring can be inserted into the opening of the valve body structure 110, improving assembly efficiency.

[0031] like Figure 1 As shown, the inner end of the annular retaining ring has a rounded or chamfered corner. This removes burrs from the inner end of the annular retaining ring, preventing burrs from damaging the sealing ball 130.

[0032] like Figure 1 and Figure 2 As shown, the sidewall of the valve body structure 110 has multiple flow holes 112 distributed circumferentially. Each flow hole 112 communicates with a cavity within the valve body structure 110, and the sum of the flow areas of the multiple flow holes 112 is greater than or equal to the flow area of ​​the one-way port 101. When the one-way port 101 is open, the one-way port 101 and each flow hole 112 are connected. The fact that the sum of the flow areas of the multiple flow holes 112 is greater than or equal to the flow area of ​​the one-way port 101 prevents the multiple flow holes 112 from affecting the fluid flow within the one-way valve.

[0033] like Figure 3 As shown, in some embodiments, the valve body structure 110 has an opening 113. One end of the opening 113 communicates with the one-way port 101, and the other end of the opening 113 communicates with the outside of the one-way valve. The flow area of ​​the opening 113 is smaller than that of the one-way port 101. Thus, when the one-way port 101 of the one-way valve is open, the fluid in the opening 113 flows at a small flow rate. This one-way valve is suitable for installation between two chambers. When the one-way port 101 of the one-way valve is open, the pressure balance between the two chambers is achieved through the opening 113. In these embodiments, the opening and closing of the fluid passage is achieved by the cooperation of the large-diameter one-way port 101 with the sealing ball 130, and the small flow rate of the fluid passage is achieved by the small-diameter opening 113. This facilitates improved stability and sealing performance of the one-way port 101, facilitates flow control, and reduces the length of the opening 113, thereby facilitating the machining of the smaller-diameter opening 113.

[0034] like Figure 3 As shown, the valve body structure 110 has a material receiving groove 114 at one end. The material receiving groove 114 is connected to the end of the opening 113 away from the one-way port 101. The diameter of the material receiving groove 114 is larger than the diameter of the opening 113. When the end of the valve body structure 110 with the opening 113 is connected to other structures by welding, excess solder may clog the small-diameter opening. By providing the material receiving groove 114, excess solder enters into the material receiving groove 114. Since the diameter of the material receiving groove 114 is larger than the diameter of the opening 113, the solder will not clog the opening after entering the material receiving groove 114. Furthermore, the material receiving groove 114 can further reduce the length of the opening 113, solving the problem of the difficulty in processing the slender opening 113.

[0035] like Figure 4As shown, this utility model also provides a pilot valve assembly 200, which includes a pilot valve seat 210, a capillary tube, and the aforementioned one-way valve 100. The pilot valve seat 210 has a pilot valve channel 211 and a mounting groove. The end of the pilot valve channel 211 has an openable and closable pilot valve port. The one-way valve 100 is installed in the mounting groove, and one end of the capillary tube is installed in the mounting groove. When the one-way port 101 of the one-way valve 100 is open, the one-way port 101 and the channel in the capillary tube are connected. When the one-way port 101 of the one-way valve 100 is closed, the one-way port 101 and the channel in the capillary tube are not connected.

[0036] At least a portion of the one-way valve 100 extends into the capillary tube. The area between the outer peripheral surface of the one-way valve 100 and the inner peripheral surface of the capillary tube is the capillary channel 201. The sidewall of the valve body structure 110 has a plurality of flow holes 112 distributed circumferentially. Each flow hole 112 is connected to the cavity and the capillary channel 201 inside the valve body structure 110. The flow area of ​​the capillary channel 201 is greater than or equal to the sum of the flow areas of the plurality of flow holes 112, and the sum of the flow areas of the plurality of flow holes 112 is greater than or equal to the flow area of ​​the one-way port 101.

[0037] Since the flow area of ​​the capillary channel 201 is greater than or equal to the sum of the flow areas of the multiple flow holes 112, and the sum of the flow areas of the multiple flow holes 112 is greater than or equal to the flow area of ​​the one-way port 101, this avoids the flow of fluid being affected by the small flow area and ensures smooth flow of fluid.

[0038] like Figures 5 to 7As shown, this application also provides a bidirectional solenoid valve, which includes a main valve assembly 300, a piston assembly 400, and a pilot valve assembly 200. The main valve assembly 300 has a piston chamber 301, a first valve port 302 and a second valve port 303 disposed opposite to each other. The first valve port 302 is connected to a first connecting pipe 311, and the second valve port 303 is connected to a second connecting pipe 312. The piston assembly 400 is movably disposed within the piston chamber 301. When the piston assembly 400 is in a blocked state, it blocks the first valve port 302 and the second valve port 303. When the piston assembly 400 is in a conducting state, the first valve port 302 and the second valve port 303 are connected. A pilot valve seat 210 is mounted on the main valve assembly 300. The pilot valve assembly 200 includes two check valves 100 and two capillary tubes. The two capillaries are a first capillary 221 and a second capillary 222. The first capillary 221 is connected to the first connecting pipe 311, and the second capillary 222 is connected to the second connecting pipe 312. When the pilot valve port of the pilot valve seat 210 is open, the pilot valve channel 211 and the piston chamber 301 are connected. One of the first capillary 221 and the second capillary 222 is connected to the pilot valve channel 211 in one direction through the corresponding one-way valve 100, and the piston assembly 400 is in a conducting state. When the pilot valve port is closed, the pilot valve channel 211 and the piston chamber 301 are not connected, and the piston assembly 400 is in a blocked state.

[0039] In some embodiments, the piston assembly 400 includes: a first piston 410 and a second piston 420, both movably disposed within a piston chamber 301. The first piston 410 is used to open and close a first valve port 302, and the second piston 420 is used to open and close a second valve port 303. The end of the first piston 410 has a first channel 411 for communicating with an external valve chamber, and the end of the second piston 420 has a second channel 421 for communicating with an external valve chamber. An elastic member 430 is disposed between the first piston 410 and the second piston 420, and the elastic member 430 provides an elastic force that keeps the first piston 410 and the second piston 420 away from each other. A third one-way valve 440 and a fourth one-way valve 450 are also included. The third one-way valve 440 is installed within the first piston 410, and the fourth one-way valve 450 is installed within the second piston 420. The third one-way valve 440 is used to unidirectionally connect the first channel 411 and the piston chamber 301, and the fourth one-way valve 450 is used to unidirectionally connect the second channel 421 and the piston chamber 301.

[0040] Among them, through the third one-way valve 440, the first channel 411, the second channel 421 and the fourth one-way valve 450, when the first valve port 302 and the second valve port 303 are opened, the piston chamber 301 and the cavity outside the piston chamber 301 are connected to achieve pressure balance.

[0041] The third check valve 440 and the fourth check valve 450 have the same structure. For example... Figure 7As shown, the third one-way valve 440 includes a valve body structure 110, a stop structure 120, and a sealing ball 130. The stop structure 120 is disposed at one end of the valve body structure 110, and the other end of the valve body structure 110 has a one-way port 101. The sealing ball 130 is movably disposed within the cavity of the valve body structure 110 to open and close the one-way port 101. The stop structure 120 limits the movement of the sealing ball 130 away from the one-way port 101. The valve body structure 110 has an opening 113, one end of which communicates with the one-way port 101, and the other end of which communicates with the first channel 411. The first piston 410 has a mating groove 412, and the end of the valve body structure 110 with the opening 113 is fixed in the mating groove 412 by welding or interference fit, thus achieving reliable fixation of the valve body structure 110.

[0042] In some embodiments, the valve body structure 110 has one end with an opening 113 fixed to a mating groove 412 by welding. The end of the valve body structure 110 has a material receiving groove 114, which communicates with the end of the opening 113 away from the one-way port 101. The diameter of the material receiving groove 114 is larger than the diameter of the opening 113, and the material receiving groove 114 is used to receive solder. During welding, excess solder may clog the small-diameter opening. By providing the material receiving groove 114, excess solder enters the material receiving groove 114. Since the diameter of the material receiving groove 114 is larger than the diameter of the opening 113, the solder will not clog the opening after entering the material receiving groove 114.

[0043] In some embodiments, during the process of the bidirectional solenoid valve switching from the closed state to the open state, the switching action of the piston assembly 400 is as follows: When fluid flows from the first connector 311 to the second connector 312, the pressure in the first connector 311 is greater than the pressure in the second connector 312. The pilot valve assembly 200 switches to the open state, the one-way valve 100 in the first capillary tube 221 closes, and the first capillary tube 221 is not connected to the pilot valve passage 211. The one-way valve 100 in the second capillary tube 222 opens, and the pilot valve passage 211 connects to the second capillary tube 222. The piston chamber 301 connects to the second capillary tube 222 through the pilot valve passage 211, and the pressure in the piston chamber 301 decreases. At this time, the pressure in the first connector 311 is greater than the pressure in the piston chamber 301, and the pressure on the first piston 410 from the first connector 311 is greater than the pressure from the piston chamber 301. The pressure of the elastic element 430; the first piston 410 moves away from the first valve port 302, and the first valve port 302 opens; the fluid main valve assembly 300 enters the outer valve chamber 321 and enters the gap between the second piston 420 and the inner wall of the outer valve chamber 321, providing pressure to the second piston 420 in the direction away from the second valve port 303; the pressure of the fluid at the end of the second piston 420 is greater than the fluid pressure in the piston chamber 301 and the pressure of the elastic element 430, and the second piston 420 moves away from the second valve port 303 under the drive of the pressure difference, and the second valve port 303 opens; the piston assembly 400 switches to the conducting state, and the fluid flows from the first connecting pipe 311 to the second connecting pipe 312.

[0044] When fluid flows from the second connector 312 to the first connector 311, the pressure in the second connector 312 is greater than the pressure in the first connector 311; the pilot valve assembly 200 switches to the open state, the one-way valve 100 in the second capillary tube 222 closes, and the second capillary tube 222 is not connected to the pilot valve passage 211; the one-way valve 100 in the first capillary tube 221 opens, and the pilot valve passage 211 connects to the first capillary tube 221; the piston chamber 301 connects to the first capillary tube 221, and the pressure in the piston chamber 301 decreases; at this time, the pressure in the second connector 312 is greater than the pressure of the fluid in the piston chamber 301, and the second piston 420 experiences a greater pressure from the second connector 312 than from the fluid in the piston chamber 301 and a greater elastic force. The pressure of the elastic element 430 is greater than the sum of the pressure in the piston chamber 301 and the pressure of the elastic element 430. Driven by the pressure difference, the first piston 410 moves away from the first valve port 302, and the first valve port 302 opens. The piston assembly 400 switches to the conducting state, and the fluid flows from the second connecting pipe 312 to the first connecting pipe 311.

[0045] Specifically, a balance channel is provided between the piston chamber 301 and the outer valve chamber 321 to connect them. With this arrangement, when the valve is closed, the fluid in the outer valve chamber 321 can enter the piston chamber 301 through the balance channel, preventing the piston chamber 301 from becoming congested and affecting valve closure. During this process, when fluid flows from the first connector 311 to the second connector 312, the pressure in the first connector 311 is greater than the pressure in the second connector 312. The first piston 410 experiences greater pressure and moves before the second piston 420, opening the first valve port 302. Similarly, when fluid flows from the second connector 312 to the first connector 311, the pressure in the second connector 312 is greater than the pressure in the first connector 311. The second piston 420 experiences greater pressure and moves before the first piston 410, opening the second valve port 303. This allows the fluid to flow into the main valve assembly 300 more quickly. The passage in the third check valve 440 and the first passage 411 form an openable and closable balanced passage; the passage in the fourth check valve 450 and the second passage 421 form an openable and closable balanced passage.

[0046] Furthermore, since the first piston 410 and the second piston 420 share the elastic element 430, the arrangement space for the elastic element 430 is larger. This allows the use of an elastic element with lower stiffness, reducing the force difference of the elastic element 430 and making the operation of the elastic element 430 more reliable. When the piston assembly 400 is in a blocked state, the elastic force of the elastic element 430 is smaller, which can also reduce the pressure difference that the first piston 410 or the second piston 420 needs to overcome to generate movement, improve the response speed of the piston assembly 400, and thus improve the opening response speed of the solenoid valve and enhance the performance of the solenoid valve.

[0047] In some embodiments, during the process of the bidirectional solenoid valve switching from the open state to the closed state, the switching action of the piston assembly 400 is as follows: When the pilot valve assembly 200 switches to the closed state, neither the first capillary tube 221 nor the second capillary tube 222 is connected to the pilot valve channel 211. The fluid in the outer valve chamber 321 flows into the piston chamber 301 through the balance channel, increasing the pressure in the piston chamber 301. The pressure of the fluid in the piston chamber 301 on the first piston 410 and the second piston 420, combined with the pressure of the elastic element 430 on the first piston 410 and the second piston 420, causes the first piston 410 to move toward the first valve port 302 and the second piston 420 to move toward the second valve port 303. When the piston assembly 400 switches to the blocking state, the first piston 410 blocks the first valve port 302 and the second piston 420 blocks the second valve port 303. Neither the first connecting pipe 311 nor the second connecting pipe 312 is connected to the outer valve chamber 321.

[0048] In the above process, when the fluid flows from the first connector 311 to the second connector 312, the pressure of the fluid in the second connector 312 on the second piston 420 is relatively small, and the second piston 420 will first block the second valve port 303; when the fluid flows from the second connector 312 to the first connector 311, the pressure of the fluid in the first connector 311 on the first piston 410 is relatively small, and the first piston 410 will first block the first valve port 302. Thus, during the valve closing process, the first piston 410 or the second piston 420, moving along the fluid flow direction, can quickly block the main valve assembly 300, improving the sealing effect of the piston assembly 400. Furthermore, the elastic force of the elastic element 430 is relatively large at this time, improving the reliability of valve closing.

[0049] Specifically, the minimum flow area of ​​a balance channel is smaller than the minimum flow area of ​​a one-way valve 100. With the above settings, when the piston assembly 400 is in the conducting state, since the flow capacity of the balance channel is less than the flow capacity of the one-way valve 100 when it is open, the pressure in the piston chamber 301 can be guaranteed to be less than the pressure in the outer valve chamber 321, so as to ensure the reliability of valve opening.

[0050] In some embodiments, the pilot valve assembly 200 further includes a housing and a valve core assembly. The pilot valve seat 210 and the housing cooperate to form an upper valve chamber, which communicates with the piston chamber 301. The first capillary tube 221 and the second capillary tube 222 communicate with the upper valve chamber through an openable / closable pilot valve passage 211. The valve core assembly is movably disposed within the upper valve chamber and can block or open the pilot valve passage 211, allowing the pilot valve assembly 200 to switch between an open and closed state. Thus, the valve core assembly can control whether the first capillary tube 221 and the second capillary tube 222 are connected to the piston chamber 301 by controlling the pilot valve passage 211, improving the control effect of the pilot valve assembly 200 and thereby increasing the response speed of the solenoid valve.

[0051] The above descriptions are merely some embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0052] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification.

[0053] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0055] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0056] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0057] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

Claims

1. A one-way valve, characterized in that, The valve includes a valve body structure (110), a stop structure (120), and a sealing ball (130). The stop structure (120) is disposed at one end of the valve body structure (110), and the other end of the valve body structure (110) has a one-way port (101). The sealing ball (130) is movably disposed in the cavity of the valve body structure (110) to open and close the one-way port (101). The stop structure (120) limits the movement of the sealing ball (130) away from the one-way port (101). When the sealing ball (130) closes the one-way port (101), the ratio of the diameter of the contact point between the one-way port (101) and the sealing ball (130) to the diameter of the sealing ball (130) is 3:8 to 5:

8.

2. The one-way valve according to claim 1, characterized in that, The one-way opening (101) has a concave surface at one end facing the sealing ball (130), and the diameter of the concave surface gradually decreases in the direction of the sealing ball (130) facing the one-way opening (101); when the sealing ball (130) closes the one-way opening (101), the outer surface of the sealing ball (130) and the concave surface are in contact.

3. The one-way valve according to claim 1, characterized in that, The one-way port (101) has a sealing cone surface at one end facing the sealing ball (130), and the diameter of the sealing cone surface gradually decreases in the direction of the sealing ball (130) facing the one-way port (101); when the sealing ball (130) closes the one-way port (101), the outer surface of the sealing ball (130) is tangent to the sealing cone surface, and the cone angle of the sealing cone surface is 100°~140°.

4. The one-way valve according to claim 1, characterized in that, The valve body structure (110) has an opening at one end away from the one-way port (101), and the stop structure (120) is an annular retaining ring, which is fixed inside the opening of the valve body structure (110).

5. The one-way valve according to claim 4, characterized in that, The valve body structure (110) has a limiting step (111) in the opening, and the end face of the annular retaining ring abuts against the limiting step (111); the annular retaining ring and the valve body structure (110) are interference fit, or the annular retaining ring and the valve body structure (110) are welded.

6. The one-way valve according to claim 4, characterized in that, The inner end of the annular retaining ring has a rounded corner or a chamfer.

7. The one-way valve according to claim 1, characterized in that, The sidewall of the valve body structure (110) has a plurality of flow holes (112) distributed in the circumferential direction. Each flow hole (112) is connected to the cavity inside the valve body structure (110). The sum of the flow areas of the plurality of flow holes (112) is greater than or equal to the flow area of ​​the one-way port (101).

8. The one-way valve according to claim 1, characterized in that, The valve body structure (110) has an opening (113), one end of which is connected to the one-way port (101), and the other end of which is connected to the outside of the one-way valve. The flow area of ​​the opening (113) is smaller than the flow area of ​​the one-way port (101).

9. The one-way valve according to claim 8, characterized in that, The valve body structure (110) has a material reservoir (114) at one end, which is connected to the end of the opening (113) away from the one-way port (101). The diameter of the material reservoir (114) is larger than the diameter of the opening (113).

10. A pilot valve assembly (200), characterized in that, The pilot valve assembly (200) includes a pilot valve seat (210), a capillary tube, and a one-way valve (100) according to any one of claims 1 to 7. The pilot valve seat (210) has a pilot valve channel (211) and a mounting groove. The end of the pilot valve channel (211) has an openable and closable pilot valve port. The one-way valve (100) is installed in the mounting groove, and one end of the capillary tube is installed in the mounting groove. When the one-way port (101) of the one-way valve (100) is open, the one-way port (101) is connected to the channel in the capillary tube.

11. The pilot valve assembly (200) according to claim 10, characterized in that, At least a portion of the one-way valve (100) extends into the capillary tube. The area between the outer peripheral surface of the one-way valve (100) and the inner peripheral surface of the capillary tube is a capillary channel (201). The sidewall of the valve body structure (110) has a plurality of flow holes (112) distributed circumferentially. Each flow hole (112) is connected to the cavity in the valve body structure (110) and the capillary channel (201). The flow area of ​​the capillary channel (201) is greater than or equal to the sum of the flow areas of the plurality of flow holes (112), and the sum of the flow areas of the plurality of flow holes (112) is greater than or equal to the flow area of ​​the one-way port (101).

12. A bidirectional solenoid valve, characterized in that, The bidirectional solenoid valve includes a main valve assembly (300), a piston assembly (400), and a pilot valve assembly (200) as described in claim 10. The main valve assembly (300) has a piston chamber (301), a first valve port (302) and a second valve port (303) disposed opposite to each other, the first valve port (302) is connected to a first connecting pipe (311), and the second valve port (303) is connected to a second connecting pipe (312). The piston assembly (400) is movably disposed within the piston chamber (301). When the piston assembly (400) is in a blocking state, it blocks the first valve port (302) and the second valve port (303). When the piston assembly (400) is in a conducting state, the first valve port (302) and the second valve port (303) are connected. The pilot valve seat (210) is installed on the main valve assembly (300). The pilot valve assembly (200) includes two check valves (100) and two capillaries. The two capillaries are a first capillary (221) and a second capillary (222). The first capillary (221) is connected to the first connecting pipe (311), and the second capillary (222) is connected to the second connecting pipe (312). When the valve port of the valve seat (210) is open, the valve channel (211) and the piston chamber (301) are connected, and one of the first capillary (221) and the second capillary (222) is connected to the valve channel (211) in one direction through the corresponding check valve (100), and the piston assembly (400) is in the conducting state; when the valve port is closed, the valve channel (211) and the piston chamber (301) are not connected, and the piston assembly (400) is in the blocking state.

13. The bidirectional solenoid valve according to claim 12, characterized in that, The main valve assembly (300) has an outer valve chamber located outside the piston assembly (400) and the piston chamber (301), the piston assembly (400) comprising: The first piston (410) and the second piston (420) are movably disposed within the piston chamber (301). The first piston (410) is used to open and close the first valve port (302), and the second piston (420) is used to open and close the second valve port (303). The end of the first piston (410) has a first channel (411) for communicating with the outer valve chamber, and the end of the second piston (420) has a second channel (421) for communicating with the outer valve chamber. An elastic element (430) is disposed between the first piston (410) and the second piston (420), the elastic element (430) providing an elastic force that keeps the first piston (410) and the second piston (420) away from each other; A third check valve (440) and a fourth check valve (450) are provided. The third check valve (440) is installed inside the first piston (410), and the fourth check valve (450) is installed inside the second piston (420). The third check valve (440) is used to connect the first channel (411) and the piston chamber (301) in one direction, and the fourth check valve (450) is used to connect the second channel (421) and the piston chamber (301) in one direction.

14. The bidirectional solenoid valve according to claim 13, characterized in that, The third check valve (440) and the fourth check valve (450) have the same structure. The third check valve (440) includes a valve body structure (110), a stop structure (120), and a sealing ball (130). The stop structure (120) is disposed at one end of the valve body structure (110), and the other end of the valve body structure (110) has a one-way port (101). The sealing ball (130) is movably disposed in the cavity of the valve body structure (110) to open and close the one-way port (101). The stop structure (120) is disposed at the other end of the valve body structure (110). 0) Limit the movement of the sealing ball (130) away from the one-way port (101); the valve body structure (110) has an opening (113), one end of the opening (113) is connected to the one-way port (101), and the other end of the opening (113) is connected to the first channel (411); the first piston (410) has a mating groove (412), and the end of the valve body structure (110) with the opening (113) is fixed in the mating groove (412) by welding or interference fit.

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