Electromagnet and electromagnetic valve

Abstract

The utility model belongs to the technical field of electromagnetic valves, and discloses an electromagnet and an electromagnetic valve. The electromagnet comprises an electromagnetic coil, a bottom plate, a movable iron core, a static iron core and a permanent magnet, the electromagnetic coil is provided with an inner hole penetrating in the axial direction of the electromagnetic coil, the bottom plate is arranged at the bottom of the electromagnetic coil, the movable iron core and the static iron core are both arranged in the inner hole, the movable iron core is located at the axial end of the static iron core and penetrates through the bottom plate, and the movable iron core can move relative to the static iron core; an elastic piece is arranged between the movable iron core and the static iron core, and the permanent magnet is arranged outside the movable iron core in a sleeving mode and abuts against the position between the electromagnetic coil and the bottom plate. When the electromagnetic valve needs to be opened, positive electricity can be connected firstly, after the valve is opened stably, the electromagnetic coil is directly powered off, the movable iron core and the static iron are still in an attraction state by means of the magnetic force of the permanent magnet, the electromagnetic valve is still in an opening state, the power-on state does not need to be kept all the time, energy is effectively saved, and the problem of performance failure of the electromagnetic valve caused by long-time power-on is solved. And when the electromagnetic valve needs to be closed, negative electricity is directly introduced.

Description

Technical Field

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

[0002] Solenoid valves are widely used fluid control components. An electromagnet is provided in the solenoid valve to control the on-off of the passage. The electromagnet mainly includes an electromagnetic coil, a moving iron core, a static iron core, and an elastic member disposed between the moving iron core and the static iron core. The opening and closing of the solenoid valve are completed through the movement of the moving iron core. Currently, the general electromagnet is of a long-time power-on mode, that is, when the electromagnetic coil is energized to generate magnetic force, after overcoming the elastic force, the moving iron core moves to be attracted to the static iron core; after power-off, the magnetic force disappears, and the elastic member resets to make the moving iron core return to its original position. Therefore, when the solenoid valve is in use, the electromagnetic coil needs to be continuously energized to maintain the attraction between the moving iron core and the static iron core, increasing energy consumption, and the electromagnetic coil generates serious heat during long-term power-on, easily burning the coil, and ultimately resulting in the failure of the solenoid valve performance.

[0003] Therefore, there is an urgent need to provide an electromagnet and a solenoid valve to solve the above problems. Summary of the Utility Model

[0004] One object of the utility model is to provide an electromagnet, which can effectively save energy and solve the problem of the failure of the solenoid valve performance caused by long-term power-on.

[0005] Another object of the utility model is to provide a solenoid valve, which can effectively save energy and solve the problem of the failure of the solenoid valve performance caused by long-term power-on.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] The electromagnet includes:

[0008] The electromagnetic coil is provided with an inner hole axially penetrating therethrough;

[0009] The bottom plate is disposed at the bottom of the electromagnetic coil;

[0010] The moving iron core and the static iron core are both disposed in the inner hole. The moving iron core is located at one axial end of the static iron core and penetrates through the bottom plate. The moving iron core can move relative to the static iron core, and an elastic member is disposed between the moving iron core and the static iron core;

[0011] The permanent magnet is sleeved outside the moving iron core and abuts between the electromagnetic coil and the bottom plate.

[0012] As an optional solution, it further includes a sealing seat. The sealing seat is partially accommodated in the inner hole. The moving iron core and the static iron core are accommodated in the sealing seat, and a sealing ring is disposed between the static iron core and the sealing seat.

[0013] As an alternative solution, a sealing groove is formed on the circumferential side wall of the static iron core, and the sealing ring is accommodated in the sealing groove.

[0014] As an alternative solution, a first stepped groove is provided on the circumferential side of the static iron core, and the bottom of the first stepped groove can abut against the sealing seat.

[0015] As an alternative solution, it further includes a bracket, the bracket is embedded at the top of the electromagnetic coil, and the top end of the static iron core passes through the bracket and is fixedly connected to the bracket.

[0016] As an alternative solution, a second stepped groove is provided on the circumferential side wall of the static iron core, and the bottom of the second stepped groove can abut against the bottom surface of the bracket.

[0017] As an alternative solution, the bracket and the bottom plate are connected to form an integrally formed structure.

[0018] As an alternative solution, the electromagnetic coil includes:

[0019] A skeleton, on which the inner hole is formed;

[0020] Two insertion pieces, which are arranged on the skeleton at intervals;

[0021] An enameled wire, which is wound around the skeleton, and two free ends of the enameled wire are respectively connected to the corresponding insertion pieces;

[0022] A housing, which covers the skeleton and the enameled wire, and part of the insertion pieces protrude outside the housing.

[0023] As an alternative solution, the side of the housing extends downward to the bottom plate to form an extension section, and a receiving groove is defined between the extension section and the bottom of the housing. The permanent magnet is embedded in the receiving groove and supported on the upper side of the bottom plate.

[0024] A solenoid valve, including the above-mentioned electromagnet.

[0025] Advantages of the present utility model:

[0026] The utility model provides an electromagnet. When a positive current is applied to the electromagnetic coil, the magnetic field generated by the electromagnetic coil and the magnetic field generated by the permanent magnet have the same direction. The two magnetic fields are superimposed, strengthening the magnetic field between the moving iron core and the static iron core. After the static iron core is magnetized, a magnetic suction force is generated, causing the moving iron core to move towards the static iron core and engage with it against the elastic force of the elastic member. When the electromagnetic coil is powered off, under the action of the magnetic field of the permanent magnet, the magnetic suction force generated by the magnetization of the static iron core is still greater than the elastic force of the elastic member, and the moving iron core still remains engaged with the static iron core. When a negative current is applied to the electromagnetic coil, the direction of the magnetic field generated by the electromagnetic coil is opposite to the direction of the magnetic field generated by the permanent magnet, which will cancel out the magnetic force generated by the permanent magnet. The magnetic suction force generated after the static iron core is magnetized will decrease and become less than the elastic force of the elastic member. At this time, the elastic member will push the moving iron core to move and disengage from the static iron core. Therefore, in actual use, when it is necessary to open the solenoid valve, a positive current can be applied first. After the valve is opened stably, the electromagnetic coil can be directly powered off. Relying on the magnetic force of the permanent magnet, the moving iron core still remains engaged with the static iron core, and the solenoid valve still remains open, enabling the solenoid valve to have a self-holding function for the working position. There is no need to keep the power-on state all the time, effectively saving energy and avoiding the problem of performance failure of the solenoid valve caused by long-term power-on. When it is necessary to close the solenoid valve, a negative current can be directly applied.

[0027] The utility model also provides a solenoid valve. By setting the above-mentioned electromagnet, it can effectively save energy and solve the problem of performance failure of the solenoid valve caused by long-term power-on. Description of the Drawings

[0028] Figure 1 is a schematic structural diagram of the electromagnet provided by the utility model;

[0029] Figure 2 is a cross-sectional view of the electromagnet provided by the utility model;

[0030] Figure 3 is a cross-sectional view of the electromagnet provided by the utility model when a positive current is applied;

[0031] Figure 4 is a cross-sectional view of the electromagnet provided by the utility model when it is powered off;

[0032] Figure 5 is a cross-sectional view of the electromagnet provided by the utility model when a reverse current is applied.

[0033] In the figure:

[0034] 10. Electromagnetic coil; 11. Skeleton; 111. Inner hole; 12. Insertion piece; 13. Enameled wire; 14. Outer shell; 15. Extension section; 16. Accommodation groove; 20. Base plate; 30. Moving iron core; 40. Static iron core; 41. Sealing groove; 42. First stepped groove; 43. Second stepped groove; 50. Elastic member; 60. Permanent magnet; 70. Sealing seat; 80. Sealing ring; 90. Bracket. Detailed implementation manners

[0035] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only parts related to the present utility model are shown in the drawings, rather than all structures.

[0036] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above and over", and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and under", and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0038] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0039] This embodiment provides an electromagnet, which can be applied to a solenoid valve. Specifically, as Figure 1 and Figure 2As shown in the figure, the electromagnet includes an electromagnetic coil 10, a bottom plate 20, a moving iron core 30, a stationary iron core 40, an elastic member 50, and a permanent magnet 60. An inner hole 111 penetrating along its axial direction is provided on the electromagnetic coil 10. The bottom plate 20 is disposed at the bottom of the electromagnetic coil 10. Both the moving iron core 30 and the stationary iron core 40 are disposed in the inner hole 111. The moving iron core 30 is located at one axial end of the stationary iron core 40 and penetrates through the bottom plate 20. The moving iron core 30 can move relative to the stationary iron core 40. An elastic member 50 is provided between the moving iron core 30 and the stationary iron core 40. The permanent magnet 60 is sleeved outside the moving iron core 30 and abuts between the electromagnetic coil 10 and the bottom plate 20. Among them, the elastic member 50 can be selected as a return spring, and the return spring can apply a thrust to the moving iron core 30 in a direction away from the stationary iron core 40.

[0040] Combined with Figures 3 to 5 , the working process of the electromagnet will be described in detail. Among them, the solid line with an arrow represents the direction of the magnetic force line of the permanent magnet 60, and the dashed line with an arrow represents the direction of the magnetic force line of the electromagnetic coil 10. As Figure 3 shown, when the electromagnetic coil 10 is energized with positive electricity, the direction of the magnetic force line of the permanent magnet 60 is the same as that of the electromagnetic coil 10, that is, the magnetic fields generated by the electromagnetic coil 10 and the permanent magnet 60 are in the same direction. The two magnetic fields are superimposed, strengthening the magnetic field between the moving iron core 30 and the stationary iron core 40. After the stationary iron core 40 is magnetized, a magnetic suction force is generated, causing the moving iron core 30 to move towards the stationary iron core 40 and engage with it against the elastic force of the elastic member 50. As Figure 4 shown, when the electromagnetic coil 10 is powered off, under the action of the magnetic field of the permanent magnet 60, the magnetic suction force generated by the magnetization of the stationary iron core 40 is still greater than the elastic force of the elastic member 50, and the moving iron core 30 still remains engaged with the stationary iron core 40. As Figure 5 shown, when the electromagnetic coil 10 is energized with negative electricity, the direction of the magnetic force line of the permanent magnet 60 is opposite to that of the electromagnetic coil 10, that is, the magnetic field directions generated by the electromagnetic coil 10 and the permanent magnet 60 are opposite, which will cancel the magnetic force generated by the permanent magnet 60. The magnetic suction force generated after the stationary iron core 40 is magnetized will decrease and be less than the elastic force of the elastic member 50. At this time, the elastic member 50 will push the moving iron core 30 to move and disengage from the stationary iron core 40.

[0041] Therefore, in actual use, when it is necessary to open the solenoid valve, positive electricity can be first applied. After the valve opening is stable, the electromagnetic coil 10 can be directly powered off. Relying on the magnetic force of the permanent magnet 60, the moving iron core 30 still remains engaged with the stationary iron core 40, and the solenoid valve still remains in the open state, enabling the solenoid valve to have a self-holding function for the working position. There is no need to keep the power-on state all the time, achieving effective energy saving and avoiding the problem of solenoid valve performance failure caused by long-term power-on. When it is necessary to close the solenoid valve, negative electricity can be directly applied.

[0042] In an alternative embodiment, as Figure 2As shown, the electromagnet further includes a sealing seat 70. The sealing seat 70 is a tubular thin-walled structure. Part of the sealing seat 70 is accommodated in the inner hole 111. The moving iron core 30 and the static iron core 40 are accommodated in the sealing seat 70. A sealing ring 80 is provided between the static iron core 40 and the sealing seat 70. And the part of the sealing seat 70 located outside the inner hole 111 is used to cooperate with the valve body of the solenoid valve. With the above arrangement, by jointly squeezing the sealing ring 80 by the sealing seat 70 and the static iron core 40, the waterproof function can be achieved, and the sealing performance of the electromagnet can be guaranteed.

[0043] Further, as Figure 2 shown, a sealing groove 41 is formed on the circumferential side wall of the static iron core 40. The sealing ring 80 is accommodated in the sealing groove 41. The sealing groove 41 provides an installation space for the sealing ring 80 and at the same time ensures good sealing performance.

[0044] In an alternative embodiment, as Figure 2 shown, a first stepped groove 42 is provided on the circumferential side of the static iron core 40. The bottom of the first stepped groove 42 can abut against the sealing seat 70, ensuring the axial positioning of the static iron core 40, and thus ensuring the relative position stability between the static iron core 40 and the sealing seat 70.

[0045] In an alternative embodiment, as Figure 1 and Figure 2 shown, the electromagnet further includes a bracket 90. The bracket 90 is embedded at the top of the electromagnetic coil 10. The top end of the static iron core 40 passes through the bracket 90 and is fixedly connected to the bracket 90. Among them, the connection method includes but is not limited to forms such as welding and riveting. Thus, the stability of the static iron core 40 can be guaranteed, and the compactness of the overall structure of the electromagnet can be guaranteed.

[0046] In an alternative embodiment, as Figure 2 shown, a second stepped groove 43 is further provided on the circumferential side wall of the static iron core 40. After the top end of the static iron core 40 passes through the bracket 90, the bottom of the second stepped groove 43 can abut against the bottom surface of the bracket 90, further ensuring the axial positioning of the static iron core 40, and thus ensuring the relative position stability between the static iron core 40 and the bracket 90.

[0047] In an alternative embodiment, as Figure 1 shown, the bracket 90 is an inverted U-shaped structure. The bracket 90 is connected to the bottom plate 20 to form an integrally formed structure and surrounds the outside of the electromagnetic coil 10. The integral molding of the bracket 90 and the bottom plate 20 reduces the cost of part production, saves the assembly links between multiple parts, and is more firm and durable in structure. In other alternative embodiments, the connection method between the bracket 90 and the bottom plate 20 can also be forms such as welding, riveting, and screw connection, which are not specifically limited herein.

[0048] Combined with Figure 1 and Figure 2, the electromagnetic coil 10 includes a bobbin 11, an enameled wire 13, a housing 14, and two inserts 12. An inner hole 111 is formed in the bobbin 11. The two inserts 12 are arranged on the bobbin 11 at intervals. The enameled wire 13 is wound around the bobbin 11. The two free ends of the enameled wire 13 are respectively connected to the corresponding inserts 12. The housing 14 covers the bobbin 11 and the enameled wire 13, and part of the insert 12 protrudes outside the housing 14, so that the exposed insert 12 can be more conveniently connected to external devices. The cross-sectional shape of the bobbin 11 is configured to be similar to a "work" - shaped structure. In this way, after the enameled wire 13 is wound around the middle position of the bobbin 11, the axial movement of the enameled wire 13 can be restricted by both ends of the bobbin 11, playing a role in positioning the enameled wire 13. The housing 14 can be a covering resin shell formed by an injection molding process, thus ensuring the tightness of the covering of the bobbin 11 and the enameled wire 13, and further ensuring a good insulation effect.

[0049] In an alternative embodiment, as Figure 2 shown, a side edge of the housing 14 extends downward to a bottom plate 20 to form an extension section 15. A receiving groove 16 is defined between the extension section 15 and the bottom of the housing 14. A permanent magnet 60 is embedded in the receiving groove 16 and supported on the upper side of the bottom plate 20. After the permanent magnet 60 is embedded in the receiving groove 16, the extension section 15 provides radial limitation for the permanent magnet 60, and the bottom surface of the housing 14 and the bottom plate 20 jointly provide axial limitation for the permanent magnet 60, thus ensuring the stability of the relative position of the permanent magnet 60 and making the overall structure of the electromagnet more compact.

[0050] This embodiment also provides a solenoid valve, which includes a valve body and the above - mentioned electromagnet. The electromagnet is arranged on the valve body and is used to control the on - off of the passage on the valve body. Among them, the specific structure and working principle of the valve body belong to the prior art and will not be elaborated here.

[0051] In actual use, when the solenoid valve needs to be opened, a positive current can be first applied. After the valve opening is stable, the electromagnetic coil 10 is directly powered off. Relying on the magnetic force of the permanent magnet 60, the moving iron core 30 still remains attracted to the static iron, and the solenoid valve still remains in the open state, enabling the solenoid valve to have a position self - holding function. There is no need to keep the power - on state all the time, achieving effective energy conservation and avoiding the problem of solenoid valve performance failure caused by long - term power - on. When the solenoid valve needs to be closed, a negative current can be directly applied.

[0052] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. An electromagnet, characterized in that include: The electromagnetic coil (10) is provided with an inner hole (111) penetrating along its axial direction; A bottom plate (20) is arranged at the bottom of the electromagnetic coil (10); The moving iron core (30) and the static iron core (40) are both arranged in the inner hole (111); the moving iron core (30) is located at one axial end of the static iron core (40) and penetrates the bottom plate (20); the moving iron core (30) is movable relative to the static iron core (40); and an elastic member (50) is arranged between the moving iron core (30) and the static iron core (40); A permanent magnet (60) is sleeved outside the moving iron core (30) and abuts between the electromagnetic coil (10) and the bottom plate (20).

2. The electromagnet according to claim 1, characterized in that It also includes a sealing seat (70), wherein the sealing seat (70) is partially accommodated in the inner hole (111), the moving iron core (30) and the static iron core (40) are accommodated in the sealing seat (70), and a sealing ring (80) is provided between the static iron core (40) and the sealing seat (70).

3. The electromagnet according to claim 2, characterized in that A sealing groove (41) is provided on the circumferential side wall of the static iron core (40), and the sealing ring (80) is accommodated in the sealing groove (41).

4. The electromagnet according to claim 2, characterized in that A first stepped groove (42) is provided on the circumferential side of the static iron core (40), and the groove bottom of the first stepped groove (42) can abut against the sealing seat (70).

5. The electromagnet according to claim 1, characterized in that It also includes a bracket (90), wherein the bracket (90) is embedded in the top of the electromagnetic coil (10), and the top end of the static iron core (40) is passed through the bracket (90) and fixedly connected to the bracket (90).

6. The electromagnet according to claim 5, characterized in that A second stepped groove (43) is provided on the circumferential side wall of the static iron core (40), and the groove bottom of the second stepped groove (43) can abut against the bottom surface of the bracket (90).

7. The electromagnet according to claim 5, characterized in that The bracket (90) is connected to the bottom plate (20) to form an integrally formed structure.

8. The electromagnet according to any one of claims 1 to 7, characterized in that: The electromagnetic coil (10) comprises: A frame (11), wherein the inner hole (111) is provided on the frame (11); Two inserts (12) are arranged on the frame (11) at intervals; An enameled wire (13) is wound around the frame (11), and two free ends of the enameled wire (13) are respectively connected to corresponding inserts (12); The outer shell (14) is covered on the frame (11) and the enameled wire (13), and part of the insert (12) is protruding outside the outer shell (14).

9. The electromagnet according to claim 8, characterized in that The side edge of the housing (14) extends downward to the bottom plate (20) to form an extension section (15), and a receiving groove (16) is defined between the extension section (15) and the bottom of the housing (14). The permanent magnet (60) is embedded in the receiving groove (16) and supported on the upper side of the bottom plate (20).

10. A solenoid valve, characterized in that: Comprising an electromagnet as described in any one of claims 1-9.

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