Solenoid valve

Abstract

The utility model provides an electromagnetic valve, which comprises a valve body component, a flow cavity is arranged in the valve body component, two valve ports are respectively arranged at two opposite ends of the flow cavity along the extending direction, and the two valve ports are communicated with connecting pipes; the piston assembly is arranged in the circulation cavity and comprises a piston sleeve and two pistons, the two pistons are arranged in the extending direction of the circulation cavity, a piston cavity is formed between the piston sleeve and the two pistons, the pistons can move relative to the piston sleeve to block or open the corresponding valve ports, and a piston cavity is formed between the piston sleeve and the two pistons; the ends, matched with the valve port, of the two pistons are each provided with a balance structure, and the connecting pipe can be communicated with the piston cavity through the balance structures. By means of the technical scheme, the problem that in the prior art, when an electromagnetic valve is closed, the response speed is low 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 is usually used to control the on-off of fluid, and the solenoid valve usually comprises a valve body assembly, a valve assembly and a piston assembly, the valve body assembly is connected in the pipeline, the piston assembly has a movable piston, the piston moves relative to the valve port of the valve body assembly to block or open the valve port, thereby realizing the control of the on-off of fluid. The piston assembly has a piston cavity, the valve assembly is communicated with the piston cavity and controls the pressure inside the piston cavity, and the piston can be driven to move when the pressure inside the piston cavity changes.

[0003] The valve assembly in the prior art usually has a balance structure, which introduces the fluid inside the valve body assembly into the piston cavity to increase the pressure inside the piston cavity, drives the piston to move towards the valve port to block the valve port, and realizes the closing of the valve. However, since the valve assembly is usually arranged in the middle of the valve body assembly, the balance structure is usually located inside the chamber of the valve body assembly, and the pressure inside the chamber of the valve body assembly is usually smaller than the pressure of the valve inlet pipe, so that the pressure inside the piston cavity cannot be increased in time when the valve is closed, the closing time of the valve is prolonged, and the response speed of the solenoid valve is reduced. SUMMARY

[0004] The utility model provides a solenoid valve to solve the problem of slow response speed of the solenoid valve in the prior art when the valve is closed.

[0005] The utility model provides a solenoid valve, the solenoid valve includes: valve body assembly has the flow passage, the flow passage is along the two ends of relative arrangement of extension direction and is provided with two valve ports respectively, two valve ports all are communicated with the pipe joint, piston assembly is set up in the flow passage, and piston assembly includes piston sleeve and two pistons, two pistons are arranged along the extension direction of flow passage, and the piston cavity is formed between piston sleeve and two pistons, and the piston can move relative to piston sleeve to block or open corresponding valve port, and the piston cavity is formed between piston sleeve and two pistons, wherein, two pistons are all provided with balance structure on the end portion that cooperates with valve port, and the pipe joint can be communicated with the piston cavity through the balance structure.

[0006] Further, the balance structure includes a balance hole, which is arranged on the end portion of the piston and coaxially arranged with the flow passage.

[0007] Further, the flow area of the valve port is S1, the flow area of the balance hole is S2, and 0.1≤S2 / S1≤0.2.

[0008] Further, the balance structure further includes a one-way valve assembly, which is arranged at the balance hole, and the one-way valve assembly is unidirectional to the piston cavity from the pipe joint.

[0009] Further, the piston comprises a piston barrel and a piston cover connected with each other, the piston cover is arranged at the end of the piston barrel, the piston cover is provided with a balance hole, the one-way valve assembly comprises a one-way valve seat and a one-way valve core, the one-way valve seat is arranged on the side of the piston cover close to the piston cavity, the one-way valve core is movably arranged in the one-way valve seat, the one-way valve core is used for blocking or opening the balance hole, the side wall of the one-way valve seat is provided with a flow passage structure, when the one-way valve core opens the balance hole, the balance hole is communicated with the piston cavity through the flow passage structure.

[0010] Further, the one-way valve seat has a limiting section, the limiting section is arranged on the side of the one-way valve seat away from the piston cover, and the limiting section is used for limiting the movement of the one-way valve core away from the piston cover.

[0011] Further, the side wall of the one-way valve seat close to the limiting section is annularly and spacedly provided with a plurality of flow grooves, and the flow grooves form the flow passage structure.

[0012] Further, the piston cover is further provided with a one-way valve port, the one-way valve port is communicated with the balance hole, the one-way valve port is located on the side of the balance hole close to the piston cavity, and the one-way valve port comprises a tapered hole, and the inner diameter of the tapered hole gradually increases away from the balance hole.

[0013] Further, the piston further comprises a sealing gasket, the sealing gasket is in sealing cooperation with the valve port, one end of the piston towards the corresponding valve port is provided with a mounting boss, the sealing gasket is sleeved on the mounting boss, a fixing structure is arranged between the mounting boss and the sealing gasket, the fixing structure is used for fixing the sealing gasket, the mounting boss is provided with a through hole, and one end of the through hole is communicated with the balance hole.

[0014] Further, the one-way valve seat is integrally formed with the piston.

[0015] By applying the technical scheme of the present application, the electromagnetic valve can move the two pistons relative to the two valve ports at the same time when closing and closing the valve, when the fluid flows bidirectionally along the two connecting pipes, one of the two pistons is the same as the flow direction of the fluid, so as to ensure the opening speed and the sealing performance when closing the valve. By arranging the balance structure on the end of the two pistons cooperating with the valve port, the balance structure can be closer to the valve port and the connecting pipe, so that one of the balance structures is closer to the high pressure area, so that the high pressure fluid can enter the piston cavity more quickly, the pressure in the piston cavity can be quickly increased when closing the valve, the response speed of the piston when closing the valve is improved, the electromagnetic valve can be closed more quickly, and the use effect of the electromagnetic valve is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of the present application form a part of the present application, the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation to the present application. In the drawings:

[0017] Figure 1 The structure schematic view of the electromagnetic valve in the closed valve state is shown;

[0018] Figure 2 The structure schematic view of the electromagnetic valve in the open valve state is shown;

[0019] Figure 3 The structure schematic view of the piston is shown;

[0020] Figure 4 The structure schematic view of the piston is shown; Figure 3 The local enlarged view of A in the structure schematic view of the piston is shown;

[0021] Figure 5 The structure schematic view of the piston and the sealing gasket assembly is shown.

[0022] Among them, the above-mentioned drawings include the following reference signs:

[0023] 01, first connecting pipe; 02, second connecting pipe; 03, first capillary; 04, second capillary;

[0024] 100, valve body assembly; 101, flow cavity; 111, first valve port; 112, second valve port;

[0025] 200, piston assembly; 201, piston cavity; 210, first piston; 220, second piston; 230, piston sleeve; 240, balance hole; 250, one-way valve assembly; 251, one-way valve seat; 2511, limiting section; 2512, flow-through groove; 252, one-way valve core; 260, piston barrel; 270, piston cover; 271, one-way valve port; 2711, straight hole; 2712, tapered hole; 280, sealing gasket; 281, gasket block; 290, mounting boss; 291, through hole;

[0026] 300, pilot valve assembly; 301, pilot valve cavity; 310, pilot valve seat; 320, sleeve; 330, first one-way valve; 340, second one-way valve. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be apparently and completely described in combination with 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 at least one exemplary embodiment is actually only illustrative, and is by no means 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.

[0028] As Figure 1 shown, the utility model embodiment provides a kind of electromagnetic valve, and electromagnetic valve includes valve body assembly 100 and piston assembly 200.Wherein, valve body assembly 100 has flow passage 101, and two valve ports are respectively provided with two valve ports in the two ends of flow passage 101 along extension direction, and two valve ports are communicated with connecting pipe.Two pistons are arranged along the extension direction of flow passage 101, and piston assembly 200 is arranged in flow passage 101, and piston assembly 200 includes piston sleeve 230 and two pistons, two pistons are arranged along the extension direction of flow passage 101, and piston sleeve 230 and two pistons form piston cavity 201, and two pistons correspond to two valve ports respectively, and piston can be moved relative to piston sleeve 230 to block or open corresponding valve port, and piston sleeve 230 and two pistons form piston cavity 201.Two pistons are all provided with balance structure on the end portion matched with valve port, and connecting pipe can be communicated with piston cavity 201 by balance structure.

[0029] The technical scheme of the present application, electromagnetic valve can have two pistons simultaneously relative to two valve ports when closing valve and closing valve, when fluid flows along two connecting pipes bidirectionally, one of two pistons will be the same as the flow direction of fluid, so as to ensure the speed of opening valve and sealing performance when closing valve.By setting balance structure on the end portion of two pistons matched with valve port, balance structure can be closer to valve port and connecting pipe, so that one of balance structure can be closer to high pressure area, so that high pressure fluid can enter piston cavity 201 faster, so that the pressure in piston cavity 201 can rise rapidly when closing valve, improve the response speed of piston when closing valve, so that electromagnetic valve can be closed faster, ensure the use effect of electromagnetic valve.

[0030] Referring to Figures 3 to 5 As shown, balance structure includes balance hole 240, and balance hole 240 is arranged on the end portion of piston, and the communication between piston cavity 201 and outside can be realized by balance hole 240, and fluid can enter piston cavity 201 by balance hole 240.

[0031] Preferably, balance hole 240 can also be arranged coaxially with flow passage 101, so as to improve the smoothness of fluid flow.

[0032] In the present application, the flow area of the valve port is S1, the flow area of the balance hole 240 is S2, and 0.1≤S2 / S1≤0.2. When S2 / S1 is greater than 0.2, the flow area of the balance hole 240 is too large, and in the state of the electromagnetic valve opening, the high-pressure fluid entering the piston cavity 201 will increase, and the piston may move. When S2 / S1 is less than 0.1, the flow area of the balance hole 240 is too small, and in the closed state, the flow performance of the fluid is poor, and the high-pressure fluid cannot enter the piston cavity 201 quickly, which affects the closing speed of the electromagnetic valve. Specifically, by setting 0.1≤S2 / S1≤0.2, the flow of the fluid entering the piston cavity 201 can be ensured to be appropriate, and the normal action of the piston will not be affected. Specifically, S2 / S1 can be set to 0.1, 0.15 or 0.2.

[0033] Further, the balance structure further comprises a one-way valve assembly 250, which is arranged at the balance hole 240 and is unidirectional to the piston cavity 201. In this way, the one-way valve assembly 250 can limit the flow direction of the fluid at the balance hole 240, prevent the fluid in the piston cavity 201 from leaking to the low-pressure direction, and ensure the opening and closing effect of the electromagnetic valve.

[0034] Specifically, the piston comprises a piston barrel 260 and a piston cover 270 connected to each other, the piston cover 270 is arranged at the end of the piston barrel 260, the balance hole 240 is arranged on the piston cover 270, 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 is arranged on the side of the piston cover 270 close to the piston cavity 201, the one-way valve core 252 is movably arranged in the one-way valve seat 251, the one-way valve core 252 is used to block or open the balance hole 240, and the side wall of the one-way valve seat 251 is provided with a flow structure. When the one-way valve core 252 opens the balance hole 240, the balance hole 240 communicates with the piston cavity 201 through the flow structure. In this way, when the fluid enters the one-way valve seat 251 through the balance hole 240, it can push the one-way valve core 252 to move away from the balance hole 240, so that the flow structure communicates with the balance hole 240, so as to realize the communication between the piston cavity 201 and the flow cavity 101.

[0035] In some feasible embodiments of the present application, the one-way valve seat 251 has a limiting section 2511, the inner diameter of the limiting section 2511 gradually decreases away from the balance hole 240, and the limiting section 2511 is arranged on the side of the one-way valve seat 251 away from the piston cover 270, so as to limit the movement of the one-way valve core 252 away from the piston cover 270.

[0036] Further, the side wall of the one-way valve seat 251 near the limiting section 2511 is provided with a plurality of flow grooves 2512 in an annular interval, and the flow grooves 2512 form a flow structure. By setting the flow structure as a groove structure, the machining of the one-way valve seat 251 can be facilitated, and the machining difficulty can be reduced. In other embodiments of the present application, the flow structure can also be set as a hole structure and the like, as long as the flow effect can be achieved.

[0037] Specifically, the limiting section 2511 can be directly riveted by the side wall of the one-way valve seat 251, that is, the side wall of the one-way valve seat 251 is extruded in the direction of the center axis, so that the one-way valve seat 251 is deformed, and then the limiting section 2511 is riveted.

[0038] Further, the piston cover 270 also has a one-way valve port 271, the one-way valve port 271 is communicated with the balance hole 240, and the one-way valve port 271 is located on the side of the balance hole 240 close to the piston cavity 201. Through the above setting, the balance hole 240 can be plugged or opened by the cooperation of the one-way valve port 271 and the one-way valve core 252, so that the one-way valve port 271 and the one-way valve core 252 can be set as standard size, without adjusting the size of the one-way valve core 252 according to the hole diameter of the balance hole 240, improving the standardization of the electromagnetic valve parts. Figure 4 As shown in the figure, the one-way valve port 271 has a straight hole 2711 and a tapered hole 2712 which are communicated with each other, the tapered hole 2712 is located on the side of the straight hole 2711 away from the balance hole 240, and the inner diameter of the tapered hole 2712 gradually increases in the direction away from the balance hole 240, so as to improve the adaptability of the one-way valve core 252 and the one-way valve port 271, and improve the sealing performance at the one-way valve port 271.

[0039] Specifically, the piston further includes a sealing gasket 280, the sealing gasket 280 is sealingly matched with the valve port, by setting the sealing gasket 280, the soft sealing between the piston and the valve port can be formed, and the sealing gasket 280 can fill the gap between the piston and the valve port through deformation, so as to improve the sealing performance of the electromagnetic valve when the valve is closed. The end of the piston towards the corresponding valve port has a mounting boss 290, the sealing gasket 280 is sleeved on the mounting boss 290, and a fixing structure is arranged between the mounting boss 290 and the sealing gasket 280, the fixing structure is used for fixing the sealing gasket 280, so as to ensure the stability of the sealing gasket 280, prevent the sealing gasket 280 from moving, and ensure that the sealing gasket 280 can stably seal with the valve port.

[0040] Specifically, the fixing structure can include a pad 281, the pad 281 is arranged on the side of the sealing gasket 280 away from the piston cover 270, and the mounting boss 290 rivets the pad 281 and the sealing gasket 280, that is, the side wall of the mounting boss 290 is extruded in the direction away from the center axis, so that the mounting boss 290 is deformed, and then the pad 281 and the sealing gasket 280 are fixed.

[0041] Further, the mounting boss 290 has a through hole 291, one end of the through hole 291 being communicated with the balance hole 240, so that the fluid can enter the balance hole 240 through the mounting boss 290.

[0042] In an embodiment of the present application, the one-way valve seat 251 is integrally formed with the piston, and such arrangement can ensure the stability of the installation of the one-way valve seat 251 and reduce the installation error of the one-way valve seat 251.

[0043] With reference to Figure 1 and Figure 2 illustrated, the valve port provided in the present application includes oppositely arranged first valve port 111 and second valve port 112, the first valve port 111 and the second valve port 112 being oppositely arranged at two sides of the flow cavity 101, the connecting pipe including first connecting pipe 01 and second connecting pipe 02, the first connecting pipe 01 being arranged at the first valve port 111 and communicated with the first valve port 111, the second connecting pipe 02 being arranged at the second valve port 112 and communicated with the second valve port 112.

[0044] The piston includes first piston 210 and second piston 220, the first piston 210 being arranged corresponding to the first valve port 111, and the second piston 220 being arranged corresponding to the second valve port 112. The first piston 210 has a first valve opening end face at one end thereof facing the first valve port 111, 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 cavity 101; the second piston 220 has a second valve opening end face at one end thereof facing the second valve port 112, 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 cavity 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 cavity 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 cavity 101 to provide a driving force to the second piston 220 to move 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 cavity 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 cavity 101 to provide a driving force to the first piston 210 to move away from the first valve port 111, so as to realize the opening of the electromagnetic valve.

[0045] Further, the first piston 210 and the second piston 220 can be further provided with elastic members, and the elastic members provide elastic force to 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.

[0046] 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.

[0047] 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.

[0048] 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:

[0049] When 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 does not communicate with the pilot valve chamber 301, the second one-way valve 340 is opened, the second pipe 02 can communicate with the pilot valve chamber 301 through the second one-way valve 340, so the piston chamber 201 can communicate with the second pipe 02, the fluid in the piston chamber 201 enters the second pipe 02 on the low pressure side through the pilot valve chamber 301, 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 subjected to a pressure from 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, providing a pressure to the second piston 220 away from the second valve port 112, the end of the second piston 220 is subjected to a fluid pressure greater than the pressure in the piston chamber 201 and the pressure 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, and the fluid can flow from the first pipe 01 to the second pipe 02 through the flow passage 101.

[0050] When 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 does not communicate with the pilot valve chamber 301, the first one-way valve 330 is opened, the first pipe 01 can communicate with the pilot valve chamber 301 through the first one-way valve 330, so the piston chamber 201 can communicate with the first pipe 01, the fluid in the piston chamber 201 enters the first pipe 01 on the low pressure side through the pilot valve chamber 301, 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 subjected to a pressure from 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, providing a pressure to the first piston 210 away from the first valve port 111, the end of the first piston 210 is subjected to a fluid pressure greater than the pressure in the piston chamber 201 and the pressure 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, and the fluid can flow from the second pipe 02 to the first pipe 01 through the flow passage 101.

[0051] Referring to Figure 1 WithFigure 2 As shown, during the switching of the electromagnetic valve from the open state to the closed state, the switching action of the electromagnetic valve is as follows:

[0052] The pilot valve assembly 300 switches to the closed state, neither the first connector pipe 01 nor the second connector pipe 02 communicates 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 the second piston 220 blocks the second valve port 112, neither the first connector pipe 01 nor the second connector pipe 02 communicates with the flow cavity 101.

[0053] 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 of example embodiments in accordance with the present application. 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.

[0054] 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 is to be understood that the drawings are not necessarily to scale as the dimensions of the parts shown are for the purpose of providing an illustration of the example embodiments. Technical, methods, and apparatus known to those of ordinary skill in the art can not be discussed in detail herein but should be considered as if the discussion were incorporated herein. In the examples shown and discussed herein, any specific values are to be interpreted as illustrative only and not as a limitation of the example embodiments. Thus, other example embodiments of the example embodiments can have different values. It is noted that like numbers and letters refer to like elements throughout the several views of the drawings and, as such, no further discussion with regard thereto is needed.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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) has a flow cavity (101), two valve ports are arranged at two ends of the flow cavity (101) respectively, and two pipes are communicated with the valve ports; A piston assembly (200) is arranged in the flow cavity (101), the piston assembly (200) comprises a piston sleeve (230) and two pistons, the two pistons are arranged along the extension direction of the flow cavity (101), a piston cavity (201) is formed between the piston sleeve (230) and the two pistons, the two pistons correspond to the two valve ports respectively, and the pistons can move relative to the piston sleeve (230) to block or open the corresponding valve ports; Wherein, the end of the two pistons matched with the valve ports is provided with a balance structure, and the pipe can be communicated with the piston cavity (201) through the balance structure.

2. The electromagnetic valve according to claim 1, characterized by The balance structure comprises a balance hole (240), the balance hole (240) is arranged at the end of the piston, and is coaxially arranged with the flow cavity (101).

3. The electromagnetic valve according to claim 2, characterized by The flow area of the valve port is S1, the flow area of the balance hole (240) is S2, and 0.1≤S2 / S1≤0.

2.

4. The electromagnetic valve according to claim 2, characterized by The balance structure further comprises a one-way valve assembly (250), the one-way valve assembly (250) is arranged at the balance hole (240), and the one-way valve assembly (250) is unidirectionally communicated from the pipe to the piston cavity (201).

5. The electromagnetic valve according to claim 4, characterized by The piston comprises a piston cylinder (260) and a piston cover (270) connected with each other, the piston cover (270) is arranged at the end of the piston cylinder (260), the balance hole (240) is arranged on the piston cover (270), 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) is arranged on the side of the piston cover (270) close to the piston cavity (201), the one-way valve core (252) is movably arranged in the one-way valve seat (251), the one-way valve core (252) is used for blocking or opening the balance hole (240), and a flow structure is arranged on the side wall of the one-way valve seat (251), when the one-way valve core (252) opens the balance hole (240), the balance hole (240) is communicated with the piston cavity (201) through the flow structure.

6. The electromagnetic valve according to claim 5, characterized by The one-way valve seat (251) has a limiting section (2511), the limiting section (2511) is arranged on the side of the one-way valve seat (251) away from the piston cover (270), and the limiting section (2511) is used for limiting the movement of the one-way valve core (252) away from the piston cover (270).

7. The electromagnetic valve according to claim 6, characterized by A plurality of flow grooves (2512) are annularly and spacedly arranged on the side wall of the one-way valve seat (251) close to the limiting section (2511), and the flow grooves (2512) form the flow structure.

8. The electromagnetic valve according to claim 5, characterized by The piston cover (270) further has a one-way valve port (271) in communication with the balance hole (240), the one-way valve port (271) is located on the side of the balance hole (240) close to the piston cavity (201), and the one-way valve port (271) comprises a tapered hole (2712) with an inner diameter gradually increasing away from the balance hole (240).

9. The electromagnetic valve according to claim 2, characterized by The piston further comprises a sealing gasket (280) in sealing fit with the valve port, one end of the piston towards the corresponding valve port has a mounting boss (290), the sealing gasket (280) is sleeved on the mounting boss (290), a fixing structure is arranged between the mounting boss (290) and the sealing gasket (280), the fixing structure is used for fixing the sealing gasket (280), and the mounting boss (290) has a through hole (291) in communication with the balance hole (240) at one end.

10. The electromagnetic valve according to claim 5, characterized by The one-way valve seat (251) is integrally formed with the piston.

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