Solenoid valve

Abstract

The utility model relates to the technical field of electromagnetic valves, in particular to a magnetic valve which comprises a valve body, an inlet and an outlet are formed in the valve body, and a valve port and a valve cavity are formed in the valve body. The diaphragm assembly is installed at the position of the valve port and seals the valve cavity, and the diaphragm assembly can move in the valve cavity and open / close the valve port so as to control connection / disconnection between the inlet and the outlet; the electromagnetic assembly is installed in the valve cavity and used for controlling connection and disconnection between the valve cavity and the outlet. The filtering assembly comprises a first-stage filtering unit and a second-stage filtering unit, the first-stage filtering unit is arranged at the inlet, and the second-stage filtering unit is arranged between the first hole and the second hole; wherein the filtering precision of the secondary filtering unit is greater than that of the primary filtering unit. The service life of the electromagnetic valve can be prolonged.

Description

Technical Field

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

[0002] Solenoid valve is an industrial device that uses electromagnetic principle to achieve precise control of media. When current passes through the internal coil of the solenoid valve, a magnetic field is generated to affect the valve core inside the valve, thereby controlling the opening and closing of the valve, thereby regulating the on-off and flow of the medium. At present, solenoid valves are commonly used in automation systems, such as household appliances, industrial production and construction projects, which can achieve efficient and precise media management.

[0003] However, the components of existing solenoid valves, especially the valve core and seals, will be worn out due to frequent switching, which will affect the life of the equipment. Regular maintenance is required to ensure stable operation, which consumes a lot of manpower and material resources. Utility Model Content

[0004] Based on this, it is necessary to provide a solenoid valve with a long service life.

[0005] In order to solve the above technical problems, this application provides the following technical solutions:

[0006] A solenoid valve, comprising: a valve body, the valve body is provided with an inlet and an outlet, and the valve body has a valve port and a valve cavity; a diaphragm assembly, installed at the valve port and sealing the valve cavity, and the diaphragm assembly can move in the valve cavity and open / close the valve port to control the on / off between the inlet and the outlet; wherein the diaphragm assembly is provided with a first hole, a second hole and a third hole, the first hole is connected to the inlet, the second hole connects the first hole with the valve cavity, and the third hole is connected to the outlet; an electromagnetic assembly is installed in the valve cavity, and is used to open and close the third hole to control the on / off between the valve cavity and the outlet; a filter assembly, comprising a primary filter unit and a secondary filter unit, the primary filter unit is arranged at the inlet, and the secondary filter unit is arranged between the first hole and the second hole; wherein the filtering accuracy of the secondary filter unit is greater than the filtering accuracy of the primary filter unit.

[0007] In one embodiment, the primary filter unit includes a first filter screen and a second filter screen. Along the flow direction of the medium, the second filter screen is located in front of the first filter screen, and the mesh size of the second filter screen is smaller than the mesh size of the first filter screen.

[0008] It can be understood that the first filter and the second filter can cooperate to filter impurities in the medium in the solenoid valve and perform preliminary filtration on the medium entering the inlet, thereby reducing impurities in the medium flowing into the solenoid valve, reducing the impact of excessive impurities on the inside of the solenoid valve, and increasing the service life of the valve body.

[0009] In one embodiment, the mesh diameter of the second filter is D, and D≥0.18 mm.

[0010] It is understandable that since the filter cannot be too fine, otherwise it will limit the flow of the medium flowing into the solenoid valve, the mesh diameter of the second filter is set to D≥0.18mm. This setting can filter the medium flowing into the solenoid valve without affecting the working efficiency of the solenoid valve.

[0011] In one embodiment, the secondary filter unit includes a third filter screen, which is installed between the first hole and the second hole, and the diameter of the mesh of the third filter screen is smaller than the diameter of the mesh of the first filter screen or the second filter screen.

[0012] It is understandable that the third filter screen can be provided to filter finer impurities for the solenoid valve, thereby preventing the diaphragm assembly from being blocked and affecting the operation of the solenoid valve.

[0013] In one embodiment, the diaphragm assembly includes a diaphragm and a pressure plate, wherein the diaphragm is fixed in the valve cavity and can deform in response to external force and open and close the valve port; the pressure plate is mounted on the diaphragm and moves under the drive of the diaphragm;

[0014] The first hole is formed on the diaphragm and is located outside the valve port, and the second hole and the third hole are both formed on the pressure plate.

[0015] In one embodiment, the number of the first holes is set to be multiple, and the multiple first holes are arranged at intervals along the circumference of the diaphragm.

[0016] It can be understood that setting the number of the first holes to be multiple can reduce the probability of the first holes being blocked when the solenoid valve is working, thereby improving the working efficiency of the solenoid valve.

[0017] In one of the embodiments, a filter cavity is formed between the diaphragm and the pressure plate in the circumference of the diaphragm, the third filter screen is installed in the filter cavity, and the first hole and the second hole are both connected to the filter cavity.

[0018] It is understandable that the filter chamber is provided to accommodate the medium filtered by the third filter screen, so as to better flow the medium into the second hole and improve the working efficiency of the solenoid valve.

[0019] In one of the embodiments, a flow restrictor is installed at the inlet.

[0020] In one embodiment, the electromagnetic assembly includes a coil, a fixed iron core, a movable iron core and a sealing member, the fixed iron core is fixed on the valve body, and the sealing member is installed on the movable iron core;

[0021] After the coil is energized, the movable iron core and the fixed iron core are magnetized and attracted to each other, and the movable iron core moves toward the fixed iron core and is attracted to the fixed iron core to open the third hole.

[0022] In one embodiment, the electromagnetic assembly further includes a reset member, which is installed between the fixed iron core and the movable iron core, and one end of the reset member is limited to the fixed iron core, and the other end is limited to the movable iron core, for resetting the movable iron core after movement.

[0023] It is understandable that providing a reset member can help the movable iron core to quickly reset after movement, which can effectively save the working time of the electromagnetic component and improve work efficiency.

[0024] Compared with the prior art, the present application filters the medium by setting a filter assembly. Since a primary filter unit and a secondary filter unit are set, most of the impurities in the medium of the solenoid valve are filtered. In addition, the present application sets a diaphragm assembly to adjust the medium in the valve body. Since most of the impurities are filtered, the second hole and the third hole on the diaphragm assembly are not easy to be blocked. Therefore, the aperture of the second hole and the third hole is small. Due to the small aperture, the medium pressure passing through the diaphragm assembly will also be reduced accordingly, thereby improving the service life of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a schematic diagram of the structure of the solenoid valve provided in this application.

[0027] Figure 2 An exploded schematic diagram of the solenoid valve provided for this application.

[0028] Figure 3 A top view of the solenoid valve provided in this application.

[0029] Figure 4 Provided for this application Figure 3Cross-sectional view at AA in the middle.

[0030] Figure 5 This is an exploded view of the diaphragm and pressure plate provided for this application.

[0031] The meanings of the reference numerals of the components are as follows:

[0032] 100, solenoid valve; 10, valve body; 11, inlet; 12, outlet; 13, valve port; 14, valve cavity; 15, flow restrictor; 16, flow limiting diaphragm; 20, diaphragm assembly; 21, first hole; 22, second hole; 23, third hole; 24, diaphragm; 241, diaphragm through hole; 25, pressure plate; 251, mounting groove; 26, filter cavity; 30, electromagnetic assembly; 31, coil; 311, mounting cavity; 32, fixed Fixed iron core; 33, movable iron core; 331, first accommodating chamber; 332, lug; 34, sealing member; 341, second accommodating chamber; 35, reset member; 36, magnetic isolation tube; 361, receiving chamber; 37, magnetic conductor; 371, through hole; 372, connecting hole; 40, filter assembly; 41, primary filter unit; 42, secondary filter unit; 43, first filter screen; 44, second filter screen; 45, third filter screen. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0034] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0038] See also Figures 1 to 5The present application provides a solenoid valve 100, which includes a valve body 10, a diaphragm assembly 20, an electromagnetic assembly 30 and a filter assembly 40. The valve body 10 is provided with an inlet 11 and an outlet 12, and the valve body 10 has a valve port 13 and a valve cavity 14; the diaphragm assembly 20 is provided with a first hole 21, a second hole 22 and a third hole 23, the first hole 21 is connected to the inlet 11, the second hole 22 connects the first hole 21 to the valve cavity 14, the third hole 23 is connected to the outlet 12, and the diaphragm assembly 20 is installed at the valve port 13 and seals the valve cavity 14. , and the diaphragm assembly 20 can move in the valve cavity 14 and open / close the valve port 13 to control the on / off between the inlet 11 and the outlet 12; the electromagnetic assembly 30 is installed in the valve cavity 14, and is used to open and close the third hole 23 to control the on / off between the valve cavity 14 and the outlet 12; the filter assembly 40 includes a primary filter unit 41 and a secondary filter unit 42, the primary filter unit 41 is arranged at the inlet 11, and the secondary filter unit 42 is arranged between the first hole 21 and the second hole 22, and the filtering accuracy of the secondary filter unit 42 is greater than the filtering accuracy of the primary filter unit 41. In this way, the medium is filtered by setting the filter assembly 40, and most of the impurities in the medium of the valve body 10 are filtered due to the setting of the primary filter unit 41 and the secondary filter unit 42. Furthermore, since the diaphragm assembly 20 is provided to adjust the medium in the valve body 10, since most of the impurities are filtered, the second hole 22 and the third hole 23 on the diaphragm assembly 20 are not easy to be blocked, so the apertures of the second hole 22 and the third hole 23 are relatively small. Due to the small apertures, the medium pressure received by the diaphragm assembly 20 will also be reduced accordingly, and then the pressure received by the diaphragm assembly 20 will also be reduced accordingly, thereby improving the service life of the solenoid valve 100. At the same time, the reduction of the first hole 21 and the second hole 22 will reduce the water pressure received by the electromagnetic assembly 30, so the electromagnetic force provided by the electromagnetic assembly 30 can also be reduced, thereby reducing the power of the electromagnetic assembly 30 to reduce costs.

[0039] In one embodiment, if Figure 2 As shown, a flow limiter 15 is installed at the inlet 11, and a flow limiting diaphragm 16 is installed on the flow limiter 15. The flow limiting diaphragm 16 will be deformed after being squeezed. The deformed flow limiting diaphragm 16 cooperates with the flow limiter 15 to change the flow channel size of the inlet 11, thereby limiting the flow of the inlet 11 or controlling the flow size.

[0040] like Figures 2 to 4 As shown, the diaphragm assembly 20 includes a diaphragm 24 and a pressure plate 25. The diaphragm 24 is fixed in the valve cavity 14 and can deform in response to external force and open and close the valve port 13. The pressure plate 25 is installed on the diaphragm 24 and moves driven by the diaphragm 24. The first hole 21 is opened on the diaphragm 24 and is located on the outside of the valve port 13. The second hole 22 and the third hole 23 are both opened on the pressure plate 25.

[0041] Furthermore, the number of the first holes 21 is set to be multiple, and the multiple first holes 21 are arranged at intervals along the circumference of the diaphragm 24. In this way, the number of the first holes 21 is set to be multiple, which reduces the probability of the first holes 21 being blocked when the solenoid valve 100 is working, thereby improving the working efficiency of the solenoid valve 100.

[0042] In this embodiment, a mounting groove 251 is formed on the pressing plate 25 , and a diaphragm through hole 241 is formed on the diaphragm 24 corresponding thereto. The mounting groove 251 and the diaphragm through hole 241 are used to cooperate with each other to mount the diaphragm 24 on the pressing plate 25 .

[0043] like Figure 2 As shown, the electromagnetic assembly 30 includes a coil 31, a fixed iron core 32, a movable iron core 33, a seal 34 and a reset member 35, wherein the fixed iron core 32 is fixed to the valve body 10, and the seal 34 is installed on the movable iron core 33. The reset member 35 is installed between the fixed iron core 32 and the movable iron core 33, and one end of the reset member 35 is limited to the fixed iron core 32, and the other end is limited to the movable iron core 33, for resetting the movable iron core 33 after movement. In this way, the reset member 35 can help the movable iron core 33 to quickly reset after movement, which can effectively save the working time of the electromagnetic assembly 30 and improve work efficiency. A first accommodating chamber 331 is provided on the movable iron core 33, and the first accommodating chamber 331 is used to install and connect the reset member 35. The movable core 33 is provided with a lug 332 on the end surface away from the fixed core, and the seal 34 is provided with a second accommodating cavity 341 corresponding to the lug 332. The seal 34 is connected to the lug 332 through the second accommodating cavity 341, so that the seal 34 is installed on the movable core 33. The seal 34 is used to control the opening / closing of the third hole 23.

[0044] After the coil 31 is energized, the movable iron core 33 and the fixed iron core 32 are magnetized and attracted to each other, and the movable iron core 33 moves toward the fixed iron core 32 and is attracted to the fixed iron core 32, thereby opening the third hole 23. When the coil 31 is de-energized, the reset member 35 is reset, thereby driving the movable iron core 33 to reset, thereby closing the third hole 23. In this way, the electromagnetic assembly 30 can control the opening / closing of the third hole 23.

[0045] Furthermore, the electromagnetic assembly 30 also includes a magnetic isolation tube 36 and a magnetic conductor 37. The magnetic isolation tube 36 is used to reduce the magnetic flux leakage generated when the fixed iron core 32 and the movable iron core 33 are working, and the magnetic conductor 37 is used to transfer the magnetic energy generated when the coil 31 is working. The magnetic conductor 37 is provided with a plurality of through holes 371, and the through holes 371 are used to cooperate with external fasteners to install the magnetic conductor 37 on the valve body 10.

[0046] Furthermore, the coil 31 is formed with a through-mounted installation cavity 311, the magnetic isolation tube 36 is installed in the installation cavity 311, and the magnetic isolation tube 36 is provided with a receiving cavity 361, and the fixed iron core 32 and a part of the movable iron core 33 are received in the receiving cavity 361. The magnetic conductor 37 is provided with a connecting hole 372 corresponding to the installation cavity 311, and an external fastener is provided in the connecting hole 372, and the fixed iron core 32 is fixedly connected to the external fastener in the connecting hole 372 by a threaded structure or a snap-fit ​​structure.

[0047] In one embodiment, the reset member 35 may be configured as a spring or a component with elastic function, such as a polyurethane component, rubber, or the like.

[0048] like Figures 2 to 4 As shown, the primary filter unit 41 includes a first filter screen 43 and a second filter screen 44. Along the flow direction of the medium, the second filter screen 44 is located in front of the first filter screen 43, and the mesh aperture of the second filter screen 44 is smaller than the mesh aperture of the first filter screen 43. In this way, the first filter screen 43 and the second filter screen 44 can cooperate to filter the impurities of the medium in the solenoid valve 100, and perform preliminary filtration on the medium entering the inlet 11, thereby reducing the impurities in the medium flowing into the solenoid valve 100, reducing the impact of excessive impurities on the inside of the solenoid valve 100, and improving the service life of the valve body.

[0049] Specifically, since the filter cannot be too fine, otherwise it will limit the flow of the medium flowing into the solenoid valve 100, the mesh diameter D of the second filter 44 is set to D≥0.18mm. With this setting, the medium flowing into the solenoid valve 100 can be filtered without affecting the working efficiency of the solenoid valve 100.

[0050] The secondary filter unit 42 includes a third filter 45, which is installed between the first hole 21 and the second hole 22, and the diameter of the mesh of the third filter 45 is smaller than the diameter of the mesh of the first filter 43 or the second filter 44, that is, the filtering accuracy of the third filter 45 is greater than the filtering accuracy of the first filter 43 or the second filter 44. In this way, the third filter 45 can filter finer impurities for the solenoid valve 100, prevent the diaphragm assembly 20 from being blocked, and affect the operation of the solenoid valve 100.

[0051] Furthermore, a filter cavity 26 is formed between the diaphragm 24 and the pressure plate 25 in the circumferential direction of the diaphragm 24, the third filter screen 45 is installed in the filter cavity 26, and the first hole 21 and the second hole 22 are both connected to the filter cavity 26. In this way, the filter cavity 26 can accommodate the medium filtered by the third filter screen 45, so as to better flow the medium into the second hole 22, thereby improving the working efficiency of the solenoid valve 100.

[0052] like Figure 4As shown, the third hole 23 and the table surface on the side of the outlet 12 close to the seal 34 are set in a cone shape, so that the contact area between the diaphragm 24 and one end of the outlet 12, and the seal 34 and one end of the third hole 23 is reduced, thereby improving work efficiency.

[0053] The working principle of the solenoid valve 100 is described below:

[0054] First, the medium enters the inlet 11, is filtered by the first filter 43 and the second filter 44, and flows into the flow limiter 15. The flow limiter 15 is provided with a flow limiting diaphragm 16 that will deform after being squeezed. After the deformation, the flow channel size of the inlet 11 changes, and the medium flows into the valve port 13 through the changed flow channel, and then flows into the first hole 21. After being filtered by the third filter 45, it flows into the second hole 22. After flowing out of the second hole 22, the medium enters the valve cavity 14.

[0055] When the coil 31 is powered on, the seal 34 moves toward the fixed core 32 under the drive of the movable core 33, and opens the third hole 23 to allow the medium in the valve cavity 14 to flow. Under the pressure in the valve cavity 14, the medium flows through the third hole 23 and into the outlet 12, and then flows out of the solenoid valve 100 through the outlet 12.

[0056] When the coil 31 is not powered, the seal 34 seals the third hole 23 , and the pressure plate 25 drives the diaphragm 24 to move toward the seal 34 under the action of the medium pressure, and opens the outlet 12 , so that the medium directly flows into the outlet 12 and then flows out of the solenoid valve 100 through the outlet 12 .

[0057] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A solenoid valve, characterized in that: The solenoid valve comprises: A valve body, wherein the valve body is provided with an inlet and an outlet, and the valve body is provided with a valve port and a valve cavity; a diaphragm assembly installed at the valve port and sealing the valve cavity, and the diaphragm assembly can move in the valve cavity and open / close the valve port to control the on / off between the inlet and the outlet; wherein the diaphragm assembly is provided with a first hole, a second hole and a third hole, the first hole is connected to the inlet, the second hole connects the first hole to the valve cavity, and the third hole is connected to the outlet; An electromagnetic component, installed in the valve cavity, used to open and close the third hole to control the connection between the valve cavity and the outlet; The filter assembly includes a primary filter unit and a secondary filter unit, wherein the primary filter unit is arranged at the inlet, and the secondary filter unit is arranged between the first hole and the second hole; wherein the filtering accuracy of the secondary filter unit is greater than the filtering accuracy of the primary filter unit.

2. The solenoid valve according to claim 1, characterized in that: The primary filter unit includes a first filter screen and a second filter screen. Along the flow direction of the medium, the second filter screen is located in front of the first filter screen, and the mesh aperture of the second filter screen is smaller than the mesh aperture of the first filter screen.

3. The solenoid valve according to claim 2, characterized in that: The mesh diameter of the second filter is D, where D≥0.18 mm.

4. The solenoid valve according to claim 2, characterized in that: The secondary filter unit includes a third filter screen installed between the first hole and the second hole, and the diameter of the mesh of the third filter screen is smaller than the diameter of the mesh of the first filter screen or the second filter screen.

5. The solenoid valve according to claim 4, characterized in that: The diaphragm assembly includes a diaphragm and a pressure plate. The diaphragm is fixed in the valve cavity and can deform in response to external force and open and close the valve port. The pressure plate is installed on the diaphragm and moves under the drive of the diaphragm. The first hole is formed on the diaphragm and is located outside the valve port, and the second hole and the third hole are both formed on the pressure plate.

6. The solenoid valve according to claim 4, characterized in that: The number of the first holes is set to be multiple, and the multiple first holes are arranged at intervals along the circumference of the diaphragm.

7. The solenoid valve according to claim 5, characterized in that: A filter cavity is formed between the diaphragm and the pressure plate in the circumferential direction of the diaphragm, the third filter screen is installed in the filter cavity, and the first hole and the second hole are both connected to the filter cavity.

8. The solenoid valve according to claim 1, characterized in that: A flow restrictor is installed at the inlet.

9. The solenoid valve according to claim 1, characterized in that: The electromagnetic assembly includes a coil, a fixed iron core, a movable iron core and a sealing member, wherein the fixed iron core is fixed on the valve body, and the sealing member is installed on the movable iron core; After the coil is energized, the movable iron core and the fixed iron core are magnetized and attracted to each other, and the movable iron core moves toward the fixed iron core and is attracted to the fixed iron core to open the third hole.

10. The solenoid valve according to claim 9, characterized in that: The electromagnetic assembly also includes a reset member, which is installed between the fixed iron core and the movable iron core, and one end of the reset member is limited to the fixed iron core, and the other end is limited to the movable iron core, for resetting the movable iron core after movement.

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