solenoid valve

Abstract

The utility model relates to an electromagnetic valve, including casing, the coil former with core body placement hole who arranges in the casing and with casing fixed connection, the first core body and the second core body who arranges in core body placement hole, one of first core body and second core body is fixedly connected with casing, first core body and second core body respectively have the first end face and the second end face that can mutually shape cooperation, the second core body is equipped with the guide hole that extends from the second end face and removes the first end face along the axial direction, first core body has the guide protruding portion that protrudes from the first end face and can be guided to move to the guide hole. This design assembly is simpler, is favorable to reduce the complexity of manufacturing process, improves assembly efficiency, reduces cost, and in the assembly process is not easy to introduce the impurity or the deformation, improves the service life of electromagnetic valve.

Description

Technical Field

[0001] This utility model relates to an electromagnetic valve. Background Technology

[0002] Solenoid valves, as automated actuators that control fluid flow through electromagnetic force, are widely used in various fields such as industrial automation, environmental protection equipment, medical instruments, and home appliances due to their advantages such as rapid response, high control precision, and compact structure.

[0003] Currently, most solenoid valves require a guide tube to guide the valve core during assembly, and the guide tube is welded to the stationary core for sealing to ensure the valve body's internal tightness. This assembly method not only increases the complexity of the manufacturing process but may also lead to low assembly efficiency, increased costs, and the potential introduction of impurities or deformation during welding, affecting the solenoid valve's service life. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an improved solenoid valve with a longer service life and lower manufacturing cost.

[0005] To solve the above-mentioned technical problems, this utility model provides a solenoid valve, which includes:

[0006] -case,

[0007] - Coil frame, the coil frame is housed inside the housing and fixedly connected to the housing, the coil frame has core mounting holes.

[0008] - A first core and a second core are placed inside the core mounting hole, and the first core or the second core is fixedly connected to the housing.

[0009] In this invention, the first core and the second core each have a first end face and a second end face that can be shaped to fit each other. The second core has a guide hole extending axially away from the first end face from the second end face, and the first core has a guide protrusion protruding from the first end face and capable of being guided and moved relative to the guide hole. With this design, the guiding movement between the cores is achieved through the guide protrusion of the first core and the guide hole of the second core. Therefore, the core guide tube can be eliminated, and welding between the first core and the core guide tube and riveting of the core guide tube for valve installation are avoided. Assembly is simpler, reducing manufacturing complexity, improving assembly efficiency, reducing costs, and minimizing the introduction of impurities or deformation during assembly, thus extending the service life of the solenoid valve.

[0010] According to a preferred embodiment of this utility model, the first core is fixedly connected to the housing, and a sealing ring is placed between the first core and the coil frame. The first core has a protruding guide protrusion and is heavier than the second core. Therefore, it is preferable to use the heavier first core as the stationary iron core, so that the moving iron core is lighter and the response speed of the solenoid valve can be improved. By placing the sealing ring, the solenoid valve can be further sealed to prevent leakage of liquid or gas media.

[0011] More preferably, the guide protrusion has a thinned section at its connection with the first end face to improve magnetic resistance. This design reduces the cross-sectional area of ​​the protrusion at the connection, thereby increasing magnetic resistance. More preferably, the thinned section is formed as follows: the first core has a third end face on the axially opposite side of the first end face, and the first core includes a discharge hole extending axially from the third end face to the guide protrusion, the depth of which is greater than the axial distance from the third end face to the first end face. This design reduces the radial cross-sectional area of ​​the thinned section, increases its magnetic resistance, and makes it easier for the thinned section to achieve magnetic saturation. Therefore, magnetic field lines rarely enter the interior of the guide protrusion, avoiding large radial magnetic attraction between the guide protrusion and the second core, reducing wear between the guide protrusion and the guide hole, and improving the overall service life of the solenoid valve. As an alternative, the middle thinning section can also take other forms, such as removing material from the outside of the middle thinning section, removing material from both the inside and outside simultaneously, or drilling holes along the radial direction, as long as the radial cross-sectional area of ​​the middle thinning section can be reduced and the magnetic resistance of the middle thinning section can be increased.

[0012] More preferably, a valve nozzle fixedly connected to the coil frame is provided at the axial end of the housing. The second core has a cavity structure, and a sealing gasket is placed inside the cavity structure. The sealing gasket abuts against the valve nozzle when the solenoid valve is closed, and abuts against the guide protrusion when the solenoid valve is open. This design enables axial movement of the sealing gasket and the closing and opening of the solenoid valve. The cavity structure can further reduce the weight of the second core and improve the response speed of the solenoid valve.

[0013] More preferably, the gasket has a pressure balancing gap on its radially outer side, connecting the two axially opposite surfaces of the gasket. This design balances the pressure on the upper and lower sides of the gasket when it moves upward or downward, ensuring that the solenoid valve can close or open normally.

[0014] More preferably, the guide protrusion is provided with a connecting hole for connecting the cavity structure and the discharge port. Adding the connecting hole enables the solenoid valve to function as a 2-position 3-way valve. Alternatively, the connecting hole can be omitted, in which case the solenoid valve is a 2-position 2-way valve.

[0015] According to a preferred embodiment of this utility model, the valve nozzle and the coil frame are integrally formed. The valve nozzle can also be fixedly connected to the coil frame by means of threaded connection, adhesive bonding, etc., but integral forming is preferred. The coil frame is usually made of plastic. Integral forming is convenient for processing, eliminates some assembly steps, and provides good sealing performance.

[0016] According to a preferred embodiment of the present invention, the first core and the second core have a first stepped surface and a second stepped surface on their radially outer sides, respectively, and a spring is disposed between the first stepped surface and the second stepped surface. This design allows the first core and the second core to guide the spring, and makes machining on the radially outer sides more convenient, thus reducing production costs. Alternatively, the spring can be placed in other positions, such as between the first end face and the second end face.

[0017] According to a preferred embodiment of the present invention, the solenoid valve has a bottom cover made of magnetically conductive material that is fixedly connected to the housing and the coil frame. In this invention, the connection between the bottom cover and the coil frame has an axially outwardly extending protrusion. The magnetically conductive, outwardly extending protrusion can increase the magnetic induction intensity near the valve nozzle, making the magnetic field lines more uniformly distributed and stronger in the first or second core, thereby improving the magnetic attraction force and its stability between the first and second cores. Attached Figure Description

[0018] The preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. The preferred embodiments do not limit the overall concept of the present invention.

[0019] Figure 1 This is a cross-sectional view of a solenoid valve in the prior art;

[0020] Figure 2 This is a cross-sectional view of a preferred embodiment of the present invention.

[0021] In this utility model, unless otherwise specified, "axial", "radial" and "circumferential" are all relative to the solenoid valve core. Detailed Implementation

[0022] Figure 1 This illustrates a prior art solenoid valve, comprising a housing 3', a coil frame 4' fixedly mounted to the housing and having a core mounting hole, a core guide tube 9' disposed in the core mounting hole, and a first core 1' welded to the core guide tube 9'. Figure 1 The middle is the fixed iron core), and the second core 2' is axially slidably installed in the core guide tube 9'. Figure 1The first core 1' and the second core 2' are a moving iron core (or armature), a spring 5' placed between the first core 1' and the second core 2', and a valve 6' fixed by riveting the core guide tube 9'. The bottom of the second core 2' also has a cavity structure, in which a sealing gasket 7' is placed. The sealing gasket 7' has a pressure balancing gap designed on its radial outer side to balance the pressure difference between the upper and lower surfaces of the sealing gasket 7'. When the solenoid valve coil is de-energized, no magnetic attraction is generated between the first core 1' and the second core 2'. The second core 2' moves downward under the action of the spring 5', and the sealing gasket 7' blocks the valve nozzle 6', playing a sealing and buffering role. At this time, the outer channel 61' on the radially outer side of the valve nozzle 6' and the inner channel 62' on the radially inner side are disconnected by the sealing gasket 7'. The outer channel 61' is connected to the through hole in the center of the first core through the pressure balance gap of the sealing gasket 7'. When the solenoid valve is energized, a magnetic attraction is generated between the first core 1' and the second core 2'. The second core 2' moves upward against the elastic force of the spring 5', driving the sealing gasket 7' to move upward. The bottom end of the first core 1' hits the sealing gasket 7', and the through hole at its bottom end is blocked. The sealing gasket 7' again plays a sealing and buffering role. At this time, the outer channel 61' and the inner channel 62' of the valve nozzle 6' are connected, and neither is connected to the middle channel of the first core 1'. The solenoid valve thus realizes the 2-position 3-way function. However, this type of solenoid valve requires the core guide tube 9' to guide the valve core during assembly, and the core guide tube 9' needs to be welded and sealed to the fixed iron core to ensure the internal sealing of the valve body. Furthermore, the installation of the valve nozzle also requires riveting the core guide tube 9'. This not only increases the complexity of the manufacturing process but may also lead to low assembly efficiency and increased costs. Moreover, impurities or deformation can easily be introduced during welding, affecting the sealing performance and service life of the solenoid valve. In addition, the welding between the core guide tube 9' and the first core 1' requires high-level processing skills, which to some extent limits the mass production capacity and product consistency of the solenoid valve.

[0023] Figure 2 A preferred embodiment of the present invention is shown. For example... Figure 2 As shown, the solenoid valve designed according to this utility model includes a housing 3, a coil frame 4 with a core mounting hole fixedly connected to the housing 3 and housed within the housing 3, a first core 1 and a second core 2 housed within the core mounting hole, and one of the first core 1 and the second core 2 (…). Figure 2 The first core 1 is fixedly connected to the housing 3. The first core 1 and the second core 2 respectively have a first end face 11 and a second end face 21 that can be shaped to fit each other. In this utility model, the second core 2 is provided with a guide hole 22 extending axially away from the first end face 11 from the second end face 21. The first core 1 has a guide protrusion 12 that protrudes from the first end face 11 and can be guided and moved relative to the guide hole 22. This design is consistent with... Figure 1Compared with existing technologies, the guidance between the cores is achieved through the guide protrusion 12 of the first core 1 and the guide hole 22 of the second core 2. The valve nozzle 6 can be fixedly connected to the coil frame 4 by methods such as threaded connection, adhesive bonding, interference fit, and integral molding. Therefore, the core guide tube 9' can be eliminated, and the welding of the first core 1 and the core guide tube 9' and the riveting of the core guide tube 9' for installing the valve nozzle 6 are also avoided. The assembly is simpler, which helps to reduce the complexity of the manufacturing process, improve assembly efficiency, reduce costs, and is less likely to introduce impurities or deformation during the assembly process, thus improving the service life of the solenoid valve.

[0024] In this embodiment, as Figure 2 As shown, the first core 1 is fixedly connected to the housing 3, i.e., the first core 1 is a fixed iron core, and the second core 2 is a moving iron core. A sealing ring 10 is placed between the first core 1 and the coil frame 4. In other embodiments, the first core 1 can also be a moving iron core, the second core 2 can be a stationary iron core, and the sealing ring 10 can be placed between the second core 2 and the coil frame 4. The first core 1 has a protruding guide protrusion 12 and is heavier than the second core 2. Therefore, it is preferable to use the heavier first core 1 as the stationary iron core, so that the moving iron core is lighter and the response speed of the solenoid valve can be improved. By placing the sealing ring 10, the solenoid valve can be further sealed to prevent leakage of liquid or gas media.

[0025] like Figure 2 As shown, the guide protrusion 12 has a thinned section 121 at its connection with the first end face 11, which improves magnetic resistance. In this embodiment, the first core 1 has a third end face 13 on the axially opposite side of the first end face 11. The first core 1 includes a discharge hole 14 extending axially from the third end face 13 to the guide protrusion 12. The depth of the discharge hole 14 is greater than the axial distance from the third end face 13 to the first end face 11. This design reduces the radial cross-sectional area of ​​the thinned section 121, improves the magnetic resistance of the thinned section 121, and makes it easier for the thinned section 121 to achieve magnetic saturation. Therefore, the magnetic field lines are more likely to concentrate in the upper part of the first core 1 and rarely enter the interior of the guide protrusion 12, avoiding a large radial magnetic attraction between it and the second core 2, reducing wear between the guide protrusion 12 and the guide hole 22, and improving the service life of the entire solenoid valve. In other embodiments, the middle thinning section 121 that increases magnetic resistance can also take other forms, such as removing material from the outside of the middle thinning section 121, removing material from both the inside and outside at the same time, or drilling holes along the radial direction, as long as the radial cross-sectional area of ​​the middle thinning section 121 can be reduced and the magnetic resistance of the middle thinning section 121 can be increased.

[0026] like Figure 2As shown, a valve nozzle 6, which is fixedly connected to the coil frame 4, is provided at the axial end of the housing 3. The second core 2 has a cavity structure 23, in which a sealing gasket 7 is placed. The sealing gasket abuts against the valve nozzle 6 when the solenoid valve is closed, and abuts against the guide protrusion 12 when the solenoid valve is open. This design enables the axial movement of the sealing gasket 7 and the closing and opening of the solenoid valve. The cavity structure 23 can further reduce the weight of the second core 2 and improve the response speed of the solenoid valve.

[0027] More preferably, the sealing gasket 7 has a pressure balancing gap 71 on its radially outer side, connecting the two axially opposite surfaces of the sealing gasket 7. This allows the pressure on the upper and lower sides of the sealing gasket 7 to be balanced when the sealing gasket 7 moves upward or downward, ensuring that the solenoid valve can close or open normally.

[0028] More preferably, the guide protrusion 12 is provided with a connecting hole 16 that connects the cavity structure 23 and the discharge hole 14. When the solenoid valve coil is de-energized, no magnetic attraction is generated between the first core 1 and the second core 2. The second core 2 moves downward under the action of the spring 5 until the sealing gasket 7 abuts against the valve nozzle 6. The sealing gasket 7 plays a role in sealing and buffering. At this time, the outer channel 61 on the radially outer side of the valve nozzle 6 and the inner channel 62 on the radially inner side are disconnected by the sealing gasket 7. The outer channel 61 is connected to the connecting hole 16 in the center of the first core 1 through the pressure balance gap 71 of the sealing gasket 7. When the solenoid valve is energized, a magnetic attraction is generated between the first core 1 and the second core 2. The second core 2 moves upward against the elastic force of the spring 5, driving the sealing gasket 7 to move upward. The bottom end of the first core 1 hits the sealing gasket 7, and the bottom end of the connecting hole 16 is blocked. The sealing gasket 7 plays a role in sealing and buffering again. At this time, the outer channel 61 and the inner channel 62 are connected, but neither is connected to the connecting hole 16. The solenoid valve thus realizes the function of 2 positions and 3 turns.

[0029] In other embodiments, the guide protrusion 12 may not have a connecting hole 16. Accordingly, the de-energization and energization of the solenoid valve control the disconnection and connection of the outer channel 61 and the inner channel 62. The solenoid valve thus becomes a 2-position 2-way valve. The surface area of ​​the bottom end of the guide protrusion 12 is also increased, which helps to reduce the impact pressure of the guide protrusion 12 on the sealing gasket 7 when the solenoid valve is opened, and improves the service life of the sealing gasket 7.

[0030] More preferably, such as Figure 2 As shown, the valve nozzle 6 and the coil frame 4 are integrally formed. Figure 1In the prior art shown, the valve nozzle 6' is fixedly connected to the solenoid valve by riveting the core guide tube 9'. After removing the core guide tube 9', the valve nozzle 6 can be directly connected to the coil frame 4 by means of threaded connection, adhesive bonding, integral molding, etc. The integral molding method is preferred. The material of the coil frame 4 is usually plastic. The integral molding method is convenient for processing, eliminates some assembly steps, and has good sealing performance.

[0031] More preferably, such as Figure 2 As shown, the first core 1 and the second core 2 have a first stepped surface 15 and a second stepped surface 24 on their radially outer sides, and a spring 5 is placed between the first stepped surface 15 and the second stepped surface 24. This design allows the first core 1 and the second core 2 to guide the spring 5, and makes machining on the radially outer sides easier, thus reducing production costs. In other embodiments, the spring 5 can also be placed in other locations, such as between the first end face 11 and the second end face 21.

[0032] More preferably, such as Figure 2 As shown, the solenoid valve has a bottom cover 8 made of magnetically conductive material that is fixedly connected to the housing 3 and the coil frame 4. The connection between the bottom cover 8 and the coil frame 4 has an axially outward (i.e.,...) Figure 2 The protrusion 81 extends from the lower part of the solenoid valve. Through the magnetically conductive, outwardly extending protrusion 81, the magnetic induction intensity at the lower part of the solenoid valve near the valve nozzle 6 can be increased, causing the magnetic field lines to... Figure 2 The second core 2 is more evenly distributed and has higher strength, which improves the magnetic attraction and stability between the first core 1 and the second core 2.

[0033] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

[0034] List of reference numerals

[0035] 1, 1' First Core

[0036] 11 First end face

[0037] 12 Guide protrusions

[0038] 13 Third end face

[0039] 14 Material removal hole

[0040] 15 First step surface

[0041] 16 Connecting holes

[0042] 2, 2' Second Core

[0043] 21 Second end face

[0044] 22 Guide Hole

[0045] 23. Cavity structure

[0046] 24 Second Step Surface

[0047] 3, 3' Shell

[0048] 4' Coil Bore

[0049] 5' spring

[0050] 6' valve nozzle

[0051] 61, 61' External Channel

[0052] 62' inner passage

[0053] 7' Sealing Gasket

[0054] 71 Pressure balance gap

[0055] 8.8' bottom cover

[0056] 81 Protrusion

[0057] 9' Core Guide Tube

[0058] 10 Sealing rings

Claims

1. A solenoid valve, comprising: -Shell (3), - Coil frame (4), wherein the coil frame (4) is disposed inside the housing (3) and fixedly connected to the housing (3), and the coil frame (4) has a core mounting hole. - A first core (1) and a second core (2) are placed in the core placement hole, wherein the first core (1) or the second core (2) is fixedly connected to the housing (3). The first core (1) and the second core (2) have a first end face (11) and a second end face (21) that can fit together in shape. The second core (2) has a guide hole (22) extending axially away from the first end face (11) from the second end face (21). The first core (1) has a guide protrusion (12) that protrudes from the first end face (11) and can be guided to move relative to the guide hole (22).

2. The solenoid valve according to claim 1, characterized in that, The first core (1) is fixedly connected to the housing (3), and a sealing ring (10) is placed between the first core (1) and the coil frame (4).

3. The solenoid valve according to claim 2, characterized in that, The guide protrusion (12) has a thinned section (121) at the connection with the first end face (11) to improve magnetic resistance.

4. The solenoid valve according to claim 3, characterized in that, The first core (1) has a third end face (13) on the axially opposite side of the first end face (11). The first core (1) includes a material removal hole (14) extending axially from the third end face (13) toward the guide protrusion (12). The depth of the material removal hole (14) is greater than the axial distance from the third end face (13) to the first end face (11).

5. The solenoid valve according to claim 4, characterized in that, A valve nozzle (6) is provided at the axial end of the housing (3) and is fixedly connected to the coil frame (4). The second core (2) has a cavity structure (23) and a sealing gasket (7) is placed in the cavity structure (23). The sealing gasket (7) abuts against the valve nozzle (6) when the solenoid valve is closed and abuts against the guide protrusion (12) when the solenoid valve is open.

6. The solenoid valve according to claim 5, characterized in that, The sealing gasket (7) has a pressure balance gap (71) on its radially outer side that connects the two axially opposite surfaces of the sealing gasket (7).

7. The solenoid valve according to claim 5, characterized in that, The guide protrusion (12) has a connecting hole (16) that connects the cavity structure (23) and the discharge hole (14).

8. The solenoid valve according to claim 5, characterized in that, The valve nozzle (6) is integrally formed with the coil frame (4).

9. The solenoid valve according to claim 1, characterized in that, The first core (1) and the second core (2) have a first step surface (15) and a second step surface (24) on their radial outer sides, respectively, and a spring (5) is provided between the first step surface (15) and the second step surface (24).

10. The solenoid valve according to claim 1, characterized in that, The solenoid valve has a bottom cover (8) made of magnetic material that is fixedly connected to the housing (3) and the coil frame (4), wherein the bottom cover (8) has an axially outwardly extending protrusion (81) at the connection between the bottom cover (8) and the coil frame (4).

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