Solenoid valve

Abstract

The utility model provides an electromagnetic valve which comprises a valve body assembly, a valve core assembly, a valve core assembly and a valve core assembly. The piston assembly is arranged in the circulation cavity and comprises a piston sleeve and a piston, the piston is movably connected with the piston sleeve, the piston sleeve and the piston are matched to form a piston cavity, the piston is arranged corresponding to the valve port, and the piston can move relative to the valve port to block or open the valve port; the one-way valve assembly and the piston assembly are arranged in a split mode, the one-way valve assembly is fixed to the end, facing the valve port, of the piston, the one-way valve assembly is provided with a balance hole, the two ends of the balance hole communicate with the connecting pipe and the piston cavity correspondingly, and the one-way valve assembly can block or open the balance hole and is arranged to be in one-way conduction in the direction from the connecting pipe to the piston cavity. According to the technical scheme, the problem that in the prior art, a piston of an electromagnetic valve is difficult to machine can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to solenoid valve technical field, specifically, a solenoid valve. BACKGROUND

[0002] At present, solenoid valve usually includes pilot valve assembly, valve body assembly and piston assembly, valve body assembly is connected in the pipeline, piston assembly has movable piston, pilot valve assembly moves relative to valve port of valve body assembly through control piston to block or open valve port, realizes the control to fluid on-off.

[0003] In the prior art, the piston assembly has a piston cavity, and a balance structure is further arranged on the piston to communicate a chamber of the valve body assembly with the piston cavity, so that the fluid in the chamber of the valve body assembly enters the piston cavity to increase the pressure inside the piston cavity. Furthermore, a one-way valve is arranged on the piston to control the flow direction of the fluid at the balance hole. The one-way valve is usually arranged in an integrated structure with the piston, which makes the one-way valve structure difficult to process subsequently, resulting in high processing cost of the piston. SUMMARY

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

[0005] The utility model provides a solenoid valve, solenoid valve includes: valve body assembly has the flow through cavity, the flow through cavity has the valve port, the valve port is connected with the connecting pipe, piston assembly is arranged in the flow through cavity, and piston assembly includes piston cover and piston, and piston is movably connected with piston cover, and piston cover and piston cooperate and form piston cavity, and piston is corresponded to the valve port and is arranged, and piston can move relative to the valve port to block or open the valve port, one-way valve assembly is fixed on the end of piston towards the valve port and is separated from piston assembly, one-way valve assembly has balance hole, and both ends of balance hole are communicated with connecting pipe and piston cavity respectively, one-way valve assembly can block or open balance hole, and one-way valve assembly is arranged as one-way conduction from connecting pipe to piston cavity.

[0006] By applying the technical scheme of the present application, the fluid in the flow through cavity can enter the piston cavity through the balance hole and the one-way valve assembly to adjust the pressure in the piston cavity. Furthermore, by arranging the one-way valve assembly in a structure separated from the piston, the piston and the one-way valve assembly can be processed separately and then assembled, which simplifies the complexity of the piston and reduces the processing difficulty of the balance hole and the remaining one-way conduction structure on the one-way valve assembly, improves the overall production efficiency and reduces the processing cost of the solenoid valve.

[0007] Further, the valve port comprises a first valve port and a second valve port, the first valve port is communicated with the first connecting pipe, the second valve port is communicated with the second connecting pipe, the piston comprises a first piston and a second piston, the first piston is arranged corresponding to the first valve port, the second piston is arranged corresponding to the second valve port, and the end of the first piston and the end of the second piston are both provided with a one-way valve assembly.

[0008] Further, the one-way valve assembly comprises a one-way valve seat and a one-way valve core, the one-way valve seat has a one-way valve port, the one-way valve port is communicated with the balance hole, the one-way valve core is movably arranged in the one-way valve seat to block or open the one-way valve port, and a flow-through structure is arranged on the side wall of the one-way valve seat.

[0009] Further, an annular connecting boss is arranged on the outer side wall of the one-way valve seat, the piston comprises a piston barrel and a piston plate connected with each other, the piston plate is arranged at one end of the piston barrel, a connecting hole is arranged on the end face of the piston plate towards the piston barrel, and the connecting boss is arranged in the connecting hole.

[0010] Further, the end face of the connecting boss is coplanar with the end face of the piston plate towards the piston sleeve, and the end face of the connecting boss and the end face of the piston plate towards the piston sleeve are laser-welded.

[0011] Further, the piston further comprises a sealing gasket, the sealing gasket is sealingly matched with the valve port, one end of the piston assembly towards the corresponding valve port has a mounting boss, the sealing gasket is sleeved on the mounting boss, and the sealing gasket is fixedly connected with the piston through the mounting boss.

[0012] Further, the mounting boss has a through hole, one end of the through hole is communicated with the balance hole.

[0013] Further, the mounting boss is integrally formed with the one-way valve assembly.

[0014] Further, the mounting boss is integrally formed with the piston.

[0015] Further, a pad is further sleeved on the mounting boss, and the sealing gasket is arranged between the pad and the piston plate.

[0016] Further, the flow-through structure comprises a plurality of flow-through holes, and the plurality of flow-through holes are annularly and spacedly arranged on the side wall of the one-way valve seat.

[0017] Further, the diameter of the smallest cross section of the balance hole is less than or equal to 1mm. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings constituting a part of the specification of the application are used to provide a further understanding of the present application, the schematic embodiments of the present application and the explanations thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 The utility model provides a structure schematic drawing of the electromagnetic valve in the closed valve state shows;

[0020] Figure 2 The utility model provides a structure schematic drawing of the electromagnetic valve in the open valve state shows;

[0021] Figure 3 The utility model provides a structure schematic drawing of the piston and one -way valve subassembly assembly shows in first embodiment of the utility model;

[0022] Figure 4 The utility model provides a structure schematic drawing of the piston shows in first embodiment of the utility model;

[0023] Figure 5 The utility model provides a structure schematic drawing of the one -way valve subassembly shows in first embodiment of the utility model;

[0024] Figure 6 The utility model provides a structure schematic drawing of the piston and one -way valve subassembly assembly shows in second embodiment of the utility model;

[0025] Figure 7 The utility model provides a structure schematic drawing of the piston shows in second embodiment of the utility model;

[0026] Figure 8 The utility model provides a structure schematic drawing of one -way valve subassembly shows in second embodiment of the utility model;

[0027] Figure 9 The utility model provides a structure schematic drawing of one -way valve subassembly shows in second embodiment of the utility model.

[0028] Among them, the above-mentioned drawing includes following figure marks:

[0029] 01, first connecting pipe, 02, second connecting pipe, 03, first capillary, 04, second capillary,

[0030] 100, valve body subassembly, 101, flow cavity, 111, first valve port, 112, second valve port,

[0031] 200, piston subassembly, 201, piston cavity, 210, first piston, 220, second piston, 230, piston sleeve, 240, balance hole, 250, one -way valve subassembly, 251, one -way valve seat, 2511, one -way valve port, 2512, connecting boss, 2513, flow hole, 2514, limit section, 252, one -way valve core, 260, piston cylinder, 270, piston plate, 271, connecting hole, 272, perforation, 280, sealing washer, 281, pad, 290, installation boss, 291, through -hole,

[0032] 300 pilot valve assembly; 301 pilot valve cavity; 310 pilot valve seat; 320 sleeve; 330 first check valve; 340 second check valve. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0034] As Figure 1 With Figure 2 The utility model embodiment provides a kind of electromagnetic valve, and electromagnetic valve includes valve body assembly 100, piston assembly 200 and check valve assembly 250.Wherein, valve body assembly 100 has flow passage 101, flow passage 101 has valve port, and valve port is communicated with connector tube.Piston assembly 200 is arranged in flow passage 101, and piston assembly 200 includes piston sleeve 230 and piston, piston is movably connected with piston sleeve 230, piston sleeve 230 cooperates with piston to form piston cavity, piston is arranged corresponding valve port, and piston can move relative to valve port to block or open valve port.Check valve assembly 250 is fixed at the end of piston towards valve port and is separate from piston assembly 200, and check valve assembly 250 has balance hole 240, two ends of balance hole 240 are communicated with connector tube and piston cavity 201 respectively, check valve assembly 250 can block or open balance hole 240, and check valve assembly 250 is arranged as one-way conduction from connector tube to piston cavity.

[0035] The technical solutions of the present application can be used to adjust the pressure in the piston cavity 201 by allowing the fluid in the flow passage 101 to enter the piston cavity 201 through the balance hole 240 and the check valve assembly 250, and by setting the check valve assembly 250, the flow direction of the fluid can be controlled to prevent leakage of the fluid in the piston cavity 201 and prevent the electromagnetic valve from failing to seal. In the present application, the check valve assembly 250 is also arranged to be connected separately from the piston, so that the piston and the check valve assembly 250 can be machined separately and then assembled, which simplifies the complexity of the piston and reduces the machining difficulty of the balance hole 240 and the remaining one-way conduction structure on the check valve assembly 250, improves the overall production efficiency and reduces the machining cost of the electromagnetic valve.

[0036] Specifically, the balance hole 240 is coaxially arranged with the valve port, so that the balance hole 240 is opposite to the valve port, so that the fluid at the valve port flows into the balance hole 240, and the fluid flow at the balance hole 240 is ensured.

[0037] Specifically, in the present application, the valve port includes a first valve port 111 and a second valve port 112, the first valve port 111 is communicated with the first connecting pipe 01, the second valve port 112 is communicated with the second connecting pipe 02, the piston includes a first piston 210 and a second piston 220, the first piston 210 is arranged corresponding to the first valve port 111, and the second piston 220 is arranged corresponding to the second valve port 112. In this way, the electromagnetic valve can have two pistons moving simultaneously opposite to the first valve port 111 and the second valve port 112 when the valve is closed and opened, and when the fluid flows bidirectionally along the two connecting pipes, one of the first piston 210 and the second piston 220 is the same as the flow direction of the fluid, so as to ensure the opening speed and the sealing performance when the valve is closed. At the same time, the end of the first piston 210 and the end of the second piston 220 are provided with a one-way valve assembly 250, so that the balance hole 240 can be closer to one end of the first connecting pipe 01 or the second connecting pipe 02, so that the high-pressure fluid can enter the piston cavity 201 more quickly, so as to improve the response speed of the electromagnetic valve.

[0038] Specifically, the piston sleeve 230 can be sleeved on the outside of the first piston 210 and the second piston 220, or the first piston 210 and the second piston 220 can be sleeved on the outside of the piston sleeve 230, as long as the movable connection of the piston and the piston sleeve can be realized.

[0039] Further, the end of the first piston 210 towards the first valve port 111 has a first valve opening end face, and when the first piston 210 blocks the first valve port 111, the first valve opening end face has a gap with the inner wall of the flow passage 101; the end of the second piston 220 towards the second valve port 112 has a second valve opening end face, and when the second piston 220 blocks the second valve port 112, the second valve opening end face has a gap with the inner wall of the flow passage 101. Through the above arrangement, when the first piston 210 opens the first valve port 111 and the second piston 220 blocks the second valve port 112, after the fluid enters the flow passage 101 through the first valve port 111, the fluid can enter the gap between the second valve opening end face and the inner wall of the flow passage 101, so as to provide a driving force to the second piston 220 moving away from the second valve port 112, so as to realize the opening of the electromagnetic valve; when the second piston 220 opens the second valve port 112 and the first piston 210 blocks the first valve port 111, after the fluid enters the flow passage 101 through the second valve port 112, the fluid can enter the gap between the first valve opening end face and the inner wall of the flow passage 101, so as to provide a driving force to the first piston 210 moving away from the first valve port 111, so as to realize the opening of the electromagnetic valve.

[0040] Further, the elastic member can be arranged between the first piston 210 and the second piston 220, and the elastic member can provide elastic force for the first piston 210 and the second piston 220 to move away from each other, so as to improve the movement performance of the first piston 210 and the second piston 220.

[0041] Specifically, the one-way valve assembly 250 comprises a one-way valve seat 251 and a one-way valve core 252, the one-way valve seat 251 has a one-way valve port 2511, the one-way valve port 2511 is communicated with the balance hole 240, and the one-way valve core 252 is movably arranged in the one-way valve seat 251 to block or open the one-way valve port 2511. Through the above arrangement, the balance hole 240 can be blocked or opened through the cooperation of the one-way valve port 2511 and the one-way valve core 252, so that the one-way valve port 2511 and the one-way valve core 252 can be set to a standard size, without the need to adjust the size of the one-way valve core 252 according to the hole diameter of the balance hole 240, thereby improving the standardization of the electromagnetic valve parts.

[0042] Specifically, the side wall of the one-way valve seat 251 is provided with a flow-through structure, when the one-way valve core 252 opens the one-way valve port 2511, the one-way valve port 2511 is communicated with the flow-through structure to communicate the piston cavity 201 and the flow-through cavity 101. The flow-through structure can be provided as a hole structure or a groove structure to realize the flow-through of the fluid. Preferably, it can be provided as a hole structure to improve the structural strength of the one-way valve seat 251.

[0043] In the present application, the outer side wall of the one-way valve seat 251 is annularly provided with a connecting boss 2512, the piston comprises a piston barrel 260 and a piston plate 270 connected with each other, the piston plate 270 is arranged at one end of the piston barrel 260, the end face of the piston plate 270 towards one side of the piston barrel 260 is provided with a connecting hole 271, and the connecting boss 2512 is arranged in the connecting hole 271. In this way, the one-way valve seat 251 can be provided with a positioning basis, and at the same time, the movement of the one-way valve seat 251 can be limited by the connecting hole 271, so as to ensure the stability of the installation of the one-way valve seat 251.

[0044] Further, the end face of the connecting boss 2512 and the end face of the piston plate 270 towards one side of the piston sleeve 230 are coplanar, and the end face of the connecting boss 2512 and the end face of the piston plate 270 towards one side of the piston sleeve 230 are laser-welded to stabilize the connection strength of the one-way valve assembly 250 and the piston, and at the same time, the coplanar arrangement of the end face of the connecting boss 2512 and the end face of the piston plate 270 towards one side of the piston sleeve 230 can also provide a welding basis for the connecting boss 2512 and the piston plate 270, thereby facilitating welding.

[0045] In the present application, the piston further comprises a sealing gasket 280, the sealing gasket 280 is in sealing cooperation with the valve port, the piston assembly 200 has a mounting boss 290 at one end thereof facing the corresponding valve port, the sealing gasket 280 is sleeved on the mounting boss 290, and the sealing gasket 280 is fixedly connected with the piston through the mounting boss 290. By arranging the sealing gasket 280, soft sealing can be formed between the piston and the valve port, and the sealing gasket 280 can fill the gap between the piston and the valve port through deformation, thereby improving the sealing performance of the electromagnetic valve when the valve is closed.

[0046] Specifically, the mounting boss 290 has a through hole 291, one end of the through hole 291 is in communication with the balance hole 240, so that the fluid can enter the balance hole 240 through the mounting boss 290.

[0047] Referring to Figures 3 to 5 In the first embodiment of the present application, the mounting boss 290 is integrally formed with the one-way valve assembly 250, specifically, the mounting boss 290 is integrally formed with the one-way valve seat 251, and the piston plate 270 is provided with a through hole 272 coaxially arranged with the connecting hole 271, and the mounting boss 290 is arranged in the through hole 272. In this way, the balance hole 240 and the through hole 291 can be conveniently machined, the through hole 291 and the balance hole 240 can use the same positioning basis during machining, the coaxiality of the balance hole 240 and the through hole 291 is ensured as much as possible, and the flow capacity of the fluid is ensured.

[0048] Referring to Figures 6 to 9 In the second embodiment of the present application, the mounting boss 290 is integrally formed with the piston, specifically, the mounting boss 290 is integrally formed with the piston plate 270. In this way, the one-way valve assembly 250 and the piston are in a split structure, the one-way valve assembly 250 and the piston are machined in a split manner, the machining of the balance hole 240 by the tool passing through the through hole 291 is avoided, the machining difficulty of the balance hole 240 is reduced, and the machining precision of the balance hole 240 is ensured.

[0049] Further, the balance hole 240 is arranged on the end face of the one-way valve seat 251. In this way, the end face of the one-way valve seat 251 can be directly machined by the tool to form the balance hole 240, the tool is prevented from penetrating into the one-way valve seat 251, the size deviation and tool loss caused by tool runout are reduced, the machining efficiency is improved, and the machining difficulty of the balance hole 240 is further reduced.

[0050] Referring to Figure 8 In the second embodiment of the present application, a one-way valve assembly 250 is provided, and the one-way valve port 2511 of the one-way valve assembly 250 is a straight hole, so as to be conveniently machined and formed. Figure 8As shown, in the second embodiment of the present application, a one-way valve assembly 250 is further provided, a one-way valve port 2511 of the one-way valve assembly 250 is a tapered hole, an inner diameter of the tapered hole gradually increases in a direction away from the balance hole 240, so as to adapt to a one-way valve core 252, and improve the sealing performance of the one-way valve assembly 250.

[0051] In some feasible embodiments of the present application, the mounting boss 290 is further sleeved with a pad 281, the sealing pad 280 is arranged between the pad and the piston plate 270, and the mounting boss 290 fixes the pad 281 and the sealing pad 280 by riveting, so as to fix the sealing pad 280, ensure the stability of the installation of the sealing pad 280, prevent the sealing pad 280 from moving, and ensure that the sealing pad 280 can stably seal the valve port.

[0052] Specifically in the present application, the flow structure includes a plurality of flow holes 2513, and the plurality of flow holes 2513 are annularly and spacedly arranged on the side wall of the one-way valve seat 251. In this way, the flow holes 2513 can realize the flow of fluid, and compared with the setting form of the flow grooves in the prior art, the annular and spaced arrangement of the flow holes 2513 on the side wall of the one-way valve seat 251 can also ensure the structural strength of the one-way valve seat 251 as much as possible, reduce the deformation of the one-way valve seat 251 in the machining process, and ensure the cooperation effect of the one-way valve seat 251 and the one-way valve core 252.

[0053] Preferably, the diameter of the smallest cross section of the balance hole 240 is less than or equal to 1 mm. When the diameter of the balance hole 240 is greater than 1 mm, the diameter of the balance hole 240 is too large, the speed of fluid entering the piston cavity 201 is too large when the electromagnetic valve is in the closed valve state, the pressure in the piston cavity 201 cannot be maintained in a small range, and the electromagnetic valve closed valve failure is prone to occur. Specifically, the diameter of the balance hole 240 can be selected as 0.5 mm, 0.7 mm, 0.8 mm or 1 mm.

[0054] Further, the electromagnetic valve further has a pilot valve assembly 300, the pilot valve assembly 300 has a pilot valve seat 310 and a sleeve 320, a pilot valve cavity 301 is formed between the pilot valve seat 310 and the sleeve 320, the pilot valve seat 310 is arranged on the valve body assembly 100, and the pilot valve cavity 301 is capable of communicating with the piston cavity 201 through the pilot valve seat 310. The pilot valve seat 310 is further provided with a first one-way valve 330 and a second one-way valve 340, the first one-way valve 330 is unidirectionally sealed from the pilot valve cavity 301 to the first connecting pipe 01 and unidirectionally communicated from the first connecting pipe 01 to the pilot valve cavity 301; the second one-way valve 340 is unidirectionally sealed from the pilot valve cavity 301 to the second connecting pipe 02 and unidirectionally communicated from the second connecting pipe 02 to the pilot valve cavity 301. Specifically, when the first one-way valve 330 is in the unidirectional communication state, the second one-way valve 340 is in the unidirectional sealing state, and when the first one-way valve 330 is in the unidirectional sealing state, the second one-way valve 340 is in the unidirectional communication state. In the present application, a first capillary tube 03 is arranged between the first one-way valve 330 and the first connecting pipe 01 to connect the first connecting pipe 01 and the first one-way valve 330; a second capillary tube 04 is arranged between the second one-way valve 340 and the second connecting pipe 02 to connect the second connecting pipe 02 and the second one-way valve 340.

[0055] Specifically, the pilot valve assembly 300 has an open state and a closed state arranged oppositely, when the pilot valve assembly 300 is in the open state, the pilot valve cavity 301 is capable of communicating with one of the first connecting pipe 01 or the second connecting pipe 02; when the pilot valve assembly 300 is in the closed state, neither the first connecting pipe 01 nor the second connecting pipe 02 communicates with the pilot valve cavity 301.

[0056] Referring to Figure 1 and Figure 2 As shown in the figure, in the process of switching the electromagnetic valve from the closed state to the open state, the switching action of the electromagnetic valve is as follows:

[0057] When the fluid flows from the first pipe 01 to the second pipe 02, the pressure in the first pipe 01 is greater than the pressure in the second pipe 02, at this time the pilot valve assembly 300 can switch to the open state, the first one-way valve 330 is closed, the first pipe 01 is not communicated with the pilot valve chamber 301, the second one-way valve 340 is opened, the second pipe 02 can be communicated with the pilot valve chamber 301 through the second one-way valve 340, so that the piston chamber 201 can be communicated with the second pipe 02, the pressure in the piston chamber 201 is reduced, at this time the pressure in the first pipe 01 is greater than the pressure in the piston chamber 201, the first piston 210 is driven by the pressure in the first pipe 01 greater than the elastic force of the piston chamber 201 and the elastic member, the first piston 210 moves away from the first valve port 111, the first valve port 111 is opened, the fluid enters the flow passage 101, and enters the interval between the second valve opening end face and the flow passage 101, the second piston 220 is driven by the fluid pressure greater than the pressure in the piston chamber 201 and the elastic force of the elastic member, the second piston 220 can move away from the second valve port 112 under the driving of the pressure difference, the second valve port 112 is opened, and the piston assembly 200 switches to the conductive state, so that the fluid can flow from the first pipe 01 to the second pipe 02 through the flow passage 101.

[0058] When the fluid flows from the second pipe 02 to the first pipe 01, the pressure in the second pipe 02 is greater than the pressure in the first pipe 01, at this time the pilot valve assembly 300 can switch to the open state, the second one-way valve 340 is closed, the second pipe 02 is not communicated with the pilot valve chamber 301, the first one-way valve 330 is opened, the first pipe 01 can be communicated with the pilot valve chamber 301 through the first one-way valve 330, so that the piston chamber 201 can be communicated with the first pipe 01, the pressure in the piston chamber 201 is reduced, at this time the pressure in the second pipe 02 is greater than the pressure in the piston chamber 201, the second piston 220 is driven by the pressure in the second pipe 02 greater than the elastic force of the piston chamber 201 and the elastic member, the second piston 220 moves away from the second valve port 112, the second valve port 112 is opened, the fluid enters the flow passage 101, and enters the interval between the first valve opening end face and the flow passage 101, the first piston 210 is driven by the fluid pressure greater than the pressure in the piston chamber 201 and the elastic force of the elastic member, the first piston 210 can move away from the first valve port 111 under the driving of the pressure difference, the piston assembly 200 switches to the conductive state, so that the fluid can flow from the second pipe 02 to the first pipe 01 through the flow passage 101.

[0059] Referring to Figure 1 With Figure 2 As shown in the figure, the electromagnetic valve switches from the open state to the closed state, and the switching action of the electromagnetic valve is as follows:

[0060] The pilot valve assembly 300 is switched to the closed state, neither the first connector pipe 01 nor the second connector pipe 02 is in communication with the pilot valve cavity 301, the fluid in the flow cavity 101 flows into the piston cavity 201 through the balance structure on the first piston 210 or the second piston 220, the pressure in the piston cavity 201 increases, the pressure matching elastic member of the piston cavity 201 exerts pressure on the first piston 210 and the second piston 220, the first piston 210 moves towards the first valve port 111, the second piston 220 moves towards the second valve port 112, the piston assembly 200 blocks the first valve port 111 through the first piston 210 and blocks the second valve port 112 through the second piston 220, neither the first connector pipe 01 nor the second connector pipe 02 is in communication with the flow cavity 101.

[0061] The application also provides a machining method of the electromagnetic valve, the electromagnetic valve being the electromagnetic valve described above, the machining method comprising: step one: machining the balance hole 240 on the one-way valve assembly 250; and step two: assembling the one-way valve assembly 250 and the piston assembly 200. In this way, by machining the balance hole on the split one-way valve assembly 250 and then assembling the one-way valve assembly 250 and the piston assembly 200, the complexity of the piston can be simplified, the machining difficulty of the balance hole 240 on the one-way valve assembly 250 and the remaining one-way flow structure can be reduced, and the overall production efficiency can be improved, so as to reduce the machining cost of the electromagnetic valve.

[0062] Specifically, the one-way valve seat 251 has a limiting section 2514 at one end facing the piston cavity 201, the inner diameter of the limiting section 2514 gradually decreases in the direction facing the piston cavity 201, and the limiting section 2514 is deformed and riveted into a center axial direction under the pressure of the outside through the side wall of the one-way valve seat 251 to limit the movement of the one-way valve core 252. In the first embodiment of the application, when assembling the one-way valve assembly 250 and the piston, the mounting boss 290 needs to be inserted into the perforation 272, the connecting boss 2512 and the piston plate 270 are welded, the one-way valve core 252 is placed in the one-way valve seat 251, the limiting section 2514 is machined, the sealing gasket 280 is sleeved on the mounting boss 290, and the side wall of the mounting boss 290 is deformed by riveting to fix the mounting boss 290 and the sealing gasket 280. In this way, when the connecting boss 2512 and the piston plate 270 are welded, the heat of the welding will not cause thermal deformation of the one-way valve core 252. Through the above arrangement, the bearing area of the one-way valve assembly 250 can be increased during assembly, the riveting strength can be improved, and the one-way valve core 252 can be prevented from falling off after reciprocating impact.

[0063] Further, before riveting the mounting boss 290 and the gasket 280, a tool needs to be arranged to support the one-way valve on the side of the connecting boss 2512 away from the mounting boss 290. In this way, the risk of the welded connection between the connecting boss 2512 and the piston being separated when the mounting boss 290 is riveted can be reduced, and the stability of the installation of the one-way valve assembly 250 can be ensured.

[0064] In the second embodiment of the present application, the mounting boss 290 is integrally formed with the piston. When the one-way valve assembly 250 is assembled with the piston, the gasket 280 needs to be sleeved on the mounting boss 290 first, and then the connecting boss 2512 is inserted into the through hole 272 after the mounting boss 290 and the gasket 280 are riveted, and the connecting boss 2512 and the piston plate 270 are welded, and then the one-way valve core 252 is placed in the one-way valve seat 251, and the limiting section 2514 is processed. In this way, the force of riveting the mounting boss 290 can be prevented from being transmitted to the one-way valve assembly 250, so that the one-way valve seat 251 or the one-way valve core 252 of the one-way valve assembly 250 is not damaged, such as deformation or cracks, the performance of the one-way valve assembly 250 during use can be ensured, and the service life of the one-way valve assembly 250 can be improved.

[0065] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0066] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application unless otherwise specifically stated. It will be further understood that the drawings, which are included for illustrative purposes only, show parts having particular dimensions supplied by way of example and not of limitation. Techniques, methods, and apparatus known to those of ordinary skill can not be discussed in detail because such techniques, methods, and apparatus are considered to be part of the patent art. In all examples shown and discussed herein, any specific values are to be interpreted as illustrative only and not as a limitation. Other examples of the exemplary embodiments can therefore have different values. It is to be noted that like reference numerals and letters refer to like items in the drawings and, as a result, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0067] In the description of the utility model, it is understood that the orientation words such as '' front, back, up, down, left, right '' '' horizontal, vertical, perpendicular, horizontal '' and '' top, bottom '' and the like indicated orientation or positional relationship is usually based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, in the absence of the opposite statement, these orientation words do not indicate and imply that the device or element indicated must have a particular orientation or be constructed and operated in a particular orientation, therefore can not be understood as the limitation of the protection scope of the utility model;The orientation words '' inside, outside '' refer to the inside and outside relative to the contour of each component.

[0068] For the convenience of description, spatial relative terms such as '' above'', '' above'', '' upper surface'', '' upper '' and the like can be used here to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawing. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawing. For example, if the device in the drawing is inverted, the device described as '' above '' or '' above '' other devices or structures will be positioned '' below '' or '' below '' other devices or structures. Thus, the exemplary term '' above '' can include both '' above '' and '' below '' orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used here is interpreted accordingly.

[0069] In addition, it should be noted that the use of '' first'', '' second '' and the like to limit parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore can not be understood as the limitation of the protection scope of the utility model.

[0070] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model, for those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. An electromagnetic valve characterized by comprising: The electromagnetic valve comprises: a valve body assembly (100) having a flow cavity (101) with a valve port communicated with a connecting pipe; a piston assembly (200) arranged in the flow cavity (101), the piston assembly (200) comprising a piston sleeve (230) and a piston, the piston being movably connected with the piston sleeve (230), the piston sleeve (230) and the piston cooperating to form a piston cavity (201), the piston being arranged corresponding to the valve port and capable of moving relative to the valve port to block or open the valve port; a one-way valve assembly (250) arranged separately from the piston assembly (200) and fixed at an end of the piston facing the valve port, the one-way valve assembly (250) having a balance hole (240) communicated at two ends with the connecting pipe and the piston cavity (201), the one-way valve assembly (250) being capable of blocking or opening the balance hole (240) and being arranged to be unidirectionally communicated from the connecting pipe to the piston cavity (201).

2. The electromagnetic valve according to claim 1, characterized by The valve port comprises a first valve port (111) communicated with a first connecting pipe (01) and a second valve port (112) communicated with a second connecting pipe (02), the piston comprises a first piston (210) arranged corresponding to the first valve port (111) and a second piston (220) arranged corresponding to the second valve port (112), and the end of the first piston (210) and the end of the second piston (220) are both provided with the one-way valve assembly (250).

3. The electromagnetic valve according to claim 1, characterized by The one-way valve assembly (250) comprises a one-way valve seat (251) and a one-way valve core (252), the one-way valve seat (251) has a one-way valve port (2511) communicated with the balance hole (240), the one-way valve core (252) is movably arranged in the one-way valve seat (251) to block or open the one-way valve port (2511), and a flow structure is arranged on the side wall of the one-way valve seat (251), the one-way valve port (2511) being communicated with the flow structure when the one-way valve core (252) opens the one-way valve port (2511).

4. The electromagnetic valve according to claim 3, characterized by An annular connecting boss (2512) is arranged on the outer side wall of the one-way valve seat (251), the piston comprises a piston cylinder (260) and a piston plate (270) connected with each other, the piston plate (270) is arranged at one end of the piston cylinder (260), an end face of the piston plate (270) facing one side of the piston cylinder (260) is provided with a connecting hole (271), and the connecting boss (2512) is arranged in the connecting hole (271).

5. The electromagnetic valve according to claim 4, characterized by An end surface of the connecting boss (2512) is coplanar with an end surface of the piston plate (270) on a side facing the piston sleeve (230), and the end surface of the connecting boss (2512) and the end surface of the piston plate (270) on the side facing the piston sleeve (230) are laser-welded.

6. The electromagnetic valve according to claim 1, characterized by The piston further comprises a sealing gasket (280) in sealing fit with the valve port, and the piston assembly (200) is provided with a mounting boss (290) on an end thereof facing the corresponding valve port, the sealing gasket (280) is sleeved on the mounting boss (290), and the sealing gasket (280) is fixedly connected with the piston through the mounting boss (290).

7. The electromagnetic valve according to claim 6, characterized by The mounting boss (290) has a through hole (291), and one end of the through hole (291) communicates with the balance hole (240).

8. The electromagnetic valve according to claim 6, characterized by The mounting boss (290) is integrally formed with the one-way valve assembly (250).

9. The electromagnetic valve according to claim 6, characterized by The mounting boss (290) is integrally formed with the piston.

10. The electromagnetic valve according to claim 6, characterized by The mounting boss (290) is further sleeved with a pad, and the sealing gasket (280) is arranged between the pad and an end surface of the piston on a side facing the valve port.

11. The electromagnetic valve according to claim 3, characterized by The flow-through structure comprises a plurality of flow-through holes (2513) arranged annularly and at intervals on the side wall of the one-way valve seat (251).

12. The electromagnetic valve according to claim 1, characterized by The balance hole (240) has a minimum diameter of less than or equal to 1 mm in cross section.

Images