Direct-current self-homing electromagnet
By setting up dynamic iron cores and magnetic steel in the fixed iron core cavity of the DC electromagnet, a closed magnetic circuit is formed, and an electromagnetic coil was set on the outside of the motor core at the second end of the electromagnet to form an electromagnetic circuit. There are problems with insufficient closing power and high energy consumption in technology, which realizes higher return to closed force and driving force, while reducing energy consumption.
Patent Information
- Application Number
- CN202421058095.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-05-15
AI Technical Summary
When relocating, existing DC solenoids rely solely on the spring elastic force, resulting in insufficient relocation closure force, and the compression spring requires greater electromagnetic power, resulting in an increase in the volume of the solenoid and an increase in energy consumption.
Design a kind of DC & Return electromane, and to set up a dynamic iron core in the cavity of the fixed iron core, use the same mutually exclusive performance to install the magnetic steel on both sides of the first end of the motor core in the cavity. Form the closed magnetic circuit to enhance the closing force of the return position; set the electromagnetic coil of the nested on the outside of the motor core at the second end of the cavity to form an electromagnetic circuit to increase the driving force.
Increasing the closure and driving force of the electromagnetic magnet, the output of the drive current, reducing energy consumption, saving costs, and enhancing the service life and reliability.
Smart Images
Figure CN222421515U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of electromagnets, and in particular relates to a direct current self-homing electromagnet. Background Art
[0002] A DC electromagnet is an electromagnetic actuator that converts electromagnetic energy into mechanical energy to drive a mechanical device to complete a certain action. When the existing DC electromagnet is not powered on, it simply relies on the elastic force of the spring to return the electromagnet to its original position. In addition, the closing force of the electromagnet will be affected by the hardness of the spring. The higher the hardness of the spring, the greater the closing force of the electromagnet.
[0003] If the DC electromagnet needs to be used in an application scenario with a relatively large return closing force or a large initial driving force, for example, in the application of power system switch switching, a certain holding force is required on the normally closed node of the switch, then the hardness of the spring needs to be increased. Since the electromagnetic power generated by the electromagnet compresses the spring in the process of driving the output power element to output the driving force, the increase in the hardness of the spring also means that a larger electromagnetic power is needed to pull the spring, so the volume of the electromagnet needs to be made very large accordingly. The increase in the volume of the electromagnet is not only not conducive to installation in a limited space, but also increases the difficulty of manufacturing, increases the cost of production and processing, and increases the difficulty of subsequent transportation and maintenance; in addition, due to the increase in the hardness of the spring, the greater the pressure required when compressing the spring, and the greater the electromagnetic power of the electromagnet offset by the spring, resulting in the electromagnet driving the output power element to output The driving force will be reduced, in order to compensate for the reduced driving force, it is necessary to increase the electromagnetic power generated by the electromagnetic coil, and it is necessary to increase the electromagnetic drive current, which further causes an increase in current consumption and energy consumption. Utility Model Content
[0004] The utility model provides a direct current self-returning electromagnet to solve the problems that the return of the existing direct current electromagnet is insufficient due to the simple reliance on spring support, the output driving force is reduced due to the compression of the spring, and the energy consumption is increased due to the increase of the driving current.
[0005] The technical solution adopted by the utility model is:
[0006] A DC self-homing electromagnet comprises a fixed iron core, a moving iron core, a magnetic steel, a homing spring assembly and an electromagnetic coil; the moving iron core, the magnetic steel and the electromagnetic coil are installed in a cavity of the fixed iron core; the magnetic steel is installed at a first end of the cavity and is located on both sides of the moving iron core, and the electromagnetic coil is installed at a second end of the cavity and is nested outside the moving iron core; the homing spring assembly is connected to the fixed iron core, and is used to drive the moving iron core to move along the cavity;
[0007] The moving iron core is configured as follows: when the electromagnetic coil is energized, the moving iron core, the electromagnetic coil, the magnetic steel and the fixed iron core form an electromagnetic circuit, and the moving iron core can move toward the second end; when the electromagnetic coil is de-energized, the moving iron core can move toward the first end under the action of the return spring assembly to achieve return, and the moving iron core, the magnetic steel and the fixed iron core form a closed magnetic circuit.
[0008] A DC self-homing electromagnet of the present application also has the following additional technical features:
[0009] The moving iron core has a first abutting end along the axial direction that can move toward the first end and can abut against the first end, and a second abutting end that can move toward the second end and abut against the second end; the first abutting end is connected to a push-pull member arranged outside the cavity, and the moving iron core can provide traction to the push-pull member when the second abutting end moves toward the second end.
[0010] The push-pull member has a connection end extending into the cavity for connecting with the first abutting end of the moving iron core, and a transmission end arranged outside the cavity for outputting the magnetic force of the electromagnet.
[0011] The return spring assembly includes a self-return spring, which is sleeved on the outside of the push-pull member, one end of the self-return spring in the extension direction abuts against the transmission end of the push-pull member, and the other end of the self-return spring in the extension direction abuts against the outer wall of the fixed iron core.
[0012] The return spring assembly also includes an auxiliary spring, and an auxiliary spring is connected between the second abutting end of the moving iron core and the inner wall of the cavity; the auxiliary spring can provide a driving force for the moving iron core to move toward the first end.
[0013] The fixed iron core has a positioning hole corresponding to the push-pull member, through which the connecting end of the push-pull member can extend into the cavity and connect with the first abutting end of the moving iron core to form a moving channel for the push-pull member to be linked with the moving iron core.
[0014] A sleeve is also sleeved on the outside of the push-pull member, the self-returning spring is sleeved outside the sleeve, one end of the sleeve in the axial direction can pass through the positioning hole and be connected to the moving iron core, and the other end of the sleeve in the axial direction is connected to the transmission end.
[0015] The length of the moving iron core in the axial direction is not less than the length of the magnetic steel, so that a partial area of the moving iron core can be inserted into the electromagnetic coil; the length of the moving iron core perpendicular to the axial direction is less than the spacing between the magnetic steels on both sides to form a moving gap, so that the moving iron core can move along the axial direction.
[0016] The fixed iron core is formed into a ring-shaped structure so that there is a closed space inside the fixed iron core, and the electromagnetic circuit and the closed circuit can form a closed loop in the closed space.
[0017] The length of the moving iron core in the axial direction is not less than the length of the electromagnetic coil in the axial direction, so that the moving iron core forms a transverse closed magnetic circuit in the cavity of the fixed iron core.
[0018] Due to the adoption of the above technical solution, the beneficial effects achieved by the utility model are as follows:
[0019] 1. By arranging a moving iron core in the cavity of the fixed iron core, the magnetic steel is installed on both sides of the moving iron core at the first end in the cavity by utilizing the mutual repulsion of the same poles, and the magnetic steel, the moving iron core and the fixed iron core form a closed magnetic circuit. The magnetic field induction force formed by the closed magnetic circuit can further enhance the return closing force of the moving iron core running toward the first end, which is greater than the return closing force generated by the elastic force of the traditional spring, thereby avoiding the phenomenon of insufficient return closing force achieved by the traditional spring elastic force alone;
[0020] By arranging an electromagnetic coil nested on the outside of the moving iron core at the second end of the cavity, it can be achieved that when power is turned on, an electromagnetic circuit is formed between the electromagnetic coil, the moving iron core, the fixed iron core and the magnetic steel. The magnetic force generated by the electromagnetic coil can break the closed magnetic circuit at the first end, so that the moving iron core moves to the second end, and the moving iron core has a driving force formed by the addition of the magnetic force generated by the electromagnetic coil and the magnetic force generated by the magnetic steel, thereby making the driving force of the electromagnet higher, reducing the output of the driving current, reducing the copper wire diameter of the electromagnetic coil, reducing energy consumption, saving costs, and enhancing service life and reliability.
[0021] 2. As a preferred embodiment of the present utility model, the moving iron core has a first abutting end and a second abutting end; the first abutting end is connected to a push-pull member arranged outside the cavity, and the moving iron core can provide traction to the push-pull member when the second abutting end moves toward the second end.
[0022] The first abutting end of the moving iron core can abut against the first end of the cavity, so that the moving iron core can keep the electromagnet in a reset state under the joint action of the magnetic steel and the reset elastic component described below, and the second abutting end can abut against the second end of the cavity, so that the moving iron core can be tightly attached to one end and have a strong self-holding force, thereby further improving the electromagnetic reset closing force compared with the traditional electromagnet; and the first abutting end is connected to a push-pull piece, which is located on the outside of the fixed iron core, which can avoid the traditional location on the inside of the fixed iron core. The push-pull piece is limited by the internal space of the fixed iron core and can only move inside the fixed iron core.
[0023] 3. As a preferred embodiment of the present invention, the DC self-homing electromagnet also includes an auxiliary spring.
[0024] The auxiliary spring is located between the second abutment end and the cavity, and can further assist the self-returning spring described below in exerting an elastic force on the moving iron core, thereby enhancing the returning closing force when the moving iron core moves toward the first end to achieve return, thereby avoiding the phenomenon of insufficient returning closing force achieved by relying solely on the elastic force of the spring in the traditional way.
[0025] 4. As a preferred embodiment of the present invention, a self-returning spring is connected between the connecting end and the transmission end of the push-pull member, and the self-returning spring can provide a self-returning spring force for the moving iron core to move toward the first end.
[0026] The push-pull member serves as a component for power output, and its connecting end needs to extend into the cavity to connect with the moving iron core, and its transmission end is used to connect with external equipment or components to output the power of the electromagnet; the self-returning spring arranged between the connecting end and the transmission end can provide the moving iron core with a self-returning spring force to move toward the first end, thereby further improving the return closing force.
[0027] 5. As a preferred embodiment of the present utility model, a sleeve is sleeved on the outer side of the push-pull member, and the self-returning spring is sleeved outside the sleeve.
[0028] The outer side of the push-pull member can be directly connected to the self-returning spring, or the self-returning spring can be arranged on the outer side of the push-pull member through a sleeve. The purpose of providing the sleeve between the push-pull member and the self-returning spring is to increase the connection strength between the moving iron core and the push-pull member and ensure that sufficient pressure strength is generated. The sleeve can support the push-pull member, and the sleeve can only slide along the axial direction of the positioning hole, thereby limiting the push-pull member in the radial direction, improving the positioning accuracy between the push-pull member and the moving iron core, so that the push-pull member can operate stably and effectively ensure the stable output of the push-pull force. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:
[0030] Figure 1 This is a schematic diagram of the main structure of a DC self-homing electromagnet in one embodiment of the utility model;
[0031] Figure 2 This is a top view of a DC self-homing electromagnet according to one embodiment of the utility model;
[0032] Figure 3 for Figure 2 AA cross-sectional view;
[0033] Figure 4 for Figure 2 A cross-sectional view of BB;
[0034] Figure 5 It is a schematic diagram of a moving iron core of a DC self-homing electromagnet moving toward a first end to homing in one embodiment of the utility model;
[0035] Figure 6 It is a schematic diagram of a moving iron core of a DC self-homing electromagnet moving toward the second end in one embodiment of the utility model;
[0036] In the figure,
[0037] 1 fixed iron core, 2 moving iron core, 3 magnetic steel, 4 electromagnetic coil, 5 first end, 6 second end, 7 first abutting end, 8 second abutting end, 9 auxiliary spring, 10 push-pull member, 11 self-returning spring, 12 sleeve. DETAILED DESCRIPTION
[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.
[0039] In addition, in the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.
[0040] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0041] In the present utility model, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "implementation method", "example", "one embodiment", "example" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.
[0042] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in the form of examples in conjunction with the accompanying drawings.
[0043] The utility model relates to a DC self-homing electromagnet, such as Figure 1-6 As shown, it comprises a fixed iron core 1, a moving iron core 2, a magnetic steel 3 and an electromagnetic coil 4; the moving iron core 2, the magnetic steel 3 and the electromagnetic coil 4 are installed in the cavity of the fixed iron core 1; the magnetic steel 3 is installed at the first end 5 of the cavity and is located on both sides of the moving iron core 2, and the electromagnetic coil 4 is installed at the second end 6 of the cavity and is nested outside the moving iron core 2;
[0044] The moving iron core 2 is configured as follows: when the electromagnetic coil 4 is energized, the moving iron core 2, the electromagnetic coil 4, the magnetic steel 3 and the fixed iron core 1 form an electromagnetic circuit, and the moving iron core 2 can move toward the second end 6; when the electromagnetic coil 4 is de-energized, the moving iron core 2 can move toward the first end 5 to return to its original position, and the moving iron core 2, the magnetic steel 3 and the fixed iron core 1 form a closed magnetic circuit.
[0045] like Figure 1As shown, in the initial stage of the electromagnet, that is, before the electromagnet does work, the moving iron core 2 is attracted to the first end of the fixed iron core 1 in the X direction by the magnetic induction force of the magnetic field of the magnet 3, and the moving iron core 2 is pushed toward the first end of the guide cavity by the magnetic induction force of the magnetic field formed by the auxiliary spring 9 and the magnets 3 on both sides. Because the magnet 3 is a permanent magnet, the moving iron core 2 can be tightly attached to the first end and has a strong self-retaining force.
[0046] like Figure 6 As shown, when the electromagnetic coil 4 is energized, the electromagnetic coil 4, the fixed iron core 1, the magnetic steel 3, and the moving iron core 2 form an electromagnetic circuit, and direct current is passed through the electromagnetic coil 4. According to Ampere's law, the moving iron core 2 is subjected to a magnetic force T toward the Y axis as shown in the figure, so that the moving iron core 2 moves toward the Y axis, that is, the second end 6 of the cavity moves. At this time, the driving force exerted on the moving iron core 2 includes the sum of the magnetic force T generated by the electromagnetic coil 4 and the magnetic field induction force generated by the electromagnetic circuit, thereby increasing the driving force output by the electromagnet and avoiding the traditional phenomenon of reduced driving force caused by the compression spring. In addition, due to the increase in the driving force, the driving current of the electromagnetic coil 4 can be further reduced while maintaining the original required power, thereby avoiding the current consumption of the electromagnetic coil 4 and reducing the wire diameter of the copper wire of the electromagnetic coil 4, thereby saving energy and reducing energy consumption.
[0047] like Figure 5 As shown, when the electromagnetic coil 4 is powered off, the magnetic force generated by the electromagnetic coil 4 will disappear, and the movable iron core 2 can be driven to move toward the X-axis under the action of the return elastic force of the return spring assembly described below, that is, the first end 5 of the cavity moves to realize the return of the electromagnet. At this time, the return closing force on the movable iron core 2 includes the sum of the magnetic field induction force generated by the closed magnetic circuit formed by the fixed iron core 1, the magnetic steel 3 and the movable iron core 2, the return elastic force of the return spring assembly and the driving force of the auxiliary spring 9 described below, thereby improving the return closing force and avoiding the phenomenon that the traditional return closing force is insufficient by relying solely on the support of the spring. Compared with conventional electromagnets, the self-closing force of the electromagnet is improved, the driving current of the electromagnet is smaller, and the size of the electromagnet is smaller. It has great market prospects in occasions where volume limitation and small current driving are required; it can better meet the needs of occasions requiring a larger returning closing force, and the returning function is more stable. Moreover, in the present application, when the electromagnet returns to its original position, there is no need to pass a reverse current through the electromagnetic coil 4. Only a forward direct current needs to be passed to realize the movement of the moving iron core 2. When a reverse current is passed, the moving iron core 2 does not move. When returning to its original position, it is only necessary to stop the applied current. It is more cost-effective for occasions with frequent actions and high-speed switching of the electromagnet state.
[0048] It is worth noting that the definition of Ampere's law is: hold the energized solenoid with your right hand, with your four fingers pointing in the direction of the current, then the end pointed by your thumb is the N pole of the energized solenoid. Figure 6In the position shown, the four fingers of the right hand are facing outwards to hold the spiral wire, and the thumb is pointing to the Y axis. Since the magnet 3 is a universal permanent magnet with the magnetic characteristics of the NS pole magnetic circuit, the direction of the magnetic field it generates is from the N pole to the S level; the magnets 3 on the upper and lower sides of the moving iron core 2 of the cavity have the property of repelling each other with the same poles. The bottom of the upper magnet 3 is the N pole and the top is the S level, and the top of the lower magnet 3 is the N pole and the bottom is the S level, so Figure 5 The direction of the magnetic field in the closed magnetic circuit shown is clockwise, as shown in Figure 6 The direction of the magnetic field formed by the electromagnetic loop shown is counterclockwise.
[0049] In summary, by arranging the moving iron core 2 in the cavity of the fixed iron core 1, the magnetic steel 3 is installed on both sides of the moving iron core 2 at the first end 5 in the cavity by utilizing the mutual repulsion performance of the same level, and the magnetic steel 3, the moving iron core 2 and the fixed iron core 1 form a closed magnetic circuit. The magnetic field induction force formed by the closed magnetic circuit can further enhance the return closing force of the moving iron core 2 toward the first end 5. Compared with the traditional return closing force generated by the elastic force of the spring, it is greater, thereby avoiding the phenomenon of insufficient return closing force achieved by simply relying on the elastic force of the spring in the traditional way; by arranging the moving iron core 2 at the second end 6 of the cavity The electromagnetic coil 4 nested on the outside of the moving iron core 2 can form an electromagnetic circuit among the electromagnetic coil 4, the moving iron core 2, the fixed iron core 1 and the magnetic steel 3 when power is turned on. The magnetic force generated by the electromagnetic coil 4 can break the closed magnetic circuit and weaken the magnetic field of the closed magnetic circuit, so that the moving iron core 2 has a driving force formed by the addition of the magnetic force generated by the electromagnetic coil 4 and the magnetic force generated by the magnetic steel 3, thereby making the driving force of the electromagnet higher, reducing the output of the driving current, reducing the copper wire diameter of the electromagnetic coil 4, reducing energy consumption, saving costs, and enhancing service life and reliability.
[0050] As a preferred embodiment, Figure 3 As shown, the moving iron core 2 has a first abutting end 7 that can move toward the first end 5 and abut against the first end 5 along the axial direction, and a second abutting end 8 that can move toward the second end 6 and abut against the second end 6; the first abutting end 7 is connected to a push-pull member 10 arranged outside the cavity, and the moving iron core 2 can provide traction to the push-pull member 10 when the second abutting end 8 moves toward the second end 6.
[0051] The first abutting end 7 of the moving iron core 2 can abut against the first end 5 of the cavity, so that the moving iron core 2 can keep the electromagnet in the reset state under the joint action of the magnetic steel 3 and the self-resetting spring 11 described below, and the second abutting end 8 can abut against the second end 6 of the cavity, so that the moving iron core 2 can be tightly attached to one end and have a strong self-retaining force, thereby further improving the electromagnetic reset closing force compared with the traditional electromagnet; and the first abutting end 7 is connected to a push-pull member 10, which is located on the outside of the fixed iron core 1, and the moving iron core is located on the inside of the fixed iron core 1 and is limited by the internal space of the fixed iron core 1 and can only move inside the fixed iron core 1.
[0052] As a preferred embodiment, the push-pull member 10 has a connecting end extending into the cavity for connecting with the first abutting end 7 of the moving iron core 2, and a transmission end arranged outside the cavity for outputting the magnetic force of the electromagnet.
[0053] The push-pull member 10 is a component for power output, and its connecting end needs to extend into the cavity to connect with the moving iron core 2, and its transmission end is used to connect with external equipment or components to output the power of the electromagnet.
[0054] The connection method between the moving iron core 2 and the push-pull member 10 is not limited by the present application, and any one of the following embodiments may be adopted:
[0055] Implementation method 1: Figure 3 As shown, the push-pull member 10 includes a first push-pull member 10 and a second push-pull member 10; wherein, the first push-pull member 10 adopts a U-shaped structure, and the first push-pull member 10 serves as a transmission end for directly connecting the push-pull member 10 with external equipment or parts, and the first push-pull member 10 has a connecting hole that runs through the longitudinal direction of the first push-pull member 10, and it is convenient to connect with external equipment or parts through the connecting hole to output the power of the electromagnet; wherein, the second push-pull member 10 is connected to the side of the first push-pull member 10 facing the moving iron core 2, and the second push-pull member 10 serves as the connecting end for connecting the push-pull member 10 with the moving iron core 2, and can realize linkage with the moving iron core 2, thereby driving the push-pull member 10 to output a driving force outward through the moving iron core 2.
[0056] In this embodiment, the second push-pull member 10 adopts a bolt, which includes a bolt head and a bolt rod. The bolt rod can be installed in the middle position of the first push-pull member 10, and the bolt head is located on the side away from the moving iron core 2. The bolt rod can extend into the cavity and connect with the first abutment end 7 of the moving iron core 2. The moving iron core 2 is provided with a threaded hole corresponding to the bolt rod and threadedly connected to the bolt rod. The bolt rod is installed in the threaded hole and threadedly connected to the moving iron core 2. A self-returning spring 11 is sleeved on the outer side of the bolt rod, one end of the self-returning spring 11 abuts against one side of the first push-pull member 10, and the other end of the self-returning spring 11 abuts against the outer wall of the fixed iron core 1 facing the first push-pull member 10. When the moving iron core 2 moves toward the second end 6, the self-returning spring 11 described below is compressed, and the moving iron core 2 drives the push-pull member 10 to move toward the Y axis to realize the output of the driving force. After the electromagnetic coil 4 is powered on and the current disappears, the moving iron core 2 moves toward the first end 5 under the action of the return elastic force of the self-returning spring 11. The magnetic induction force generated by the closed magnetic field can be combined with the return elastic force of the self-returning spring 11 to synthesize the return closing force, thereby improving the return closing force and avoiding the problem of insufficient return closing force caused by the traditional return closing force relying only on spring support.
[0057] Embodiment 2: The connecting end of the push-pull member 10 is connected to the first abutting end 7 of the moving iron core 2 to form an integrated structure. This embodiment has high installation accuracy requirements for the moving iron core 2 and the fixed iron core 1 to ensure that the positioning holes described below correspond to the positions of the push-pull member 10.
[0058] As a preferred embodiment, Figure 2 and Figure 3 As shown, the return spring assembly includes a self-return spring 11; the self-return spring 11 is sleeved on the outside of the push-pull member 10, one end of the self-return spring 11 in the extension direction abuts against the transmission end of the push-pull member 10, and the other end of the self-return spring 11 in the extension direction abuts against the outer wall of the fixed iron core 1.
[0059] The self-returning spring 11 is located on the outside of the push-pull member 10, with one end abutting against the transmission end of the push-pull member 10 and the other end abutting against the outer wall of the fixed iron core 1 facing the push-pull member 10. During the process of the push-pull member 10 being driven by the moving iron core 2 to move toward the fixed iron core 1, the return elastic force generated by the self-returning spring 11 can be compressed to form the return closing force of the electromagnet.
[0060] As a preferred embodiment, Figure 1 and Figure 3 As shown, the DC self-homing electromagnet also includes an auxiliary spring 9, and an auxiliary spring 9 is connected between the second abutting end 8 of the moving iron core 2 and the inner wall of the cavity; the auxiliary spring 9 can provide a driving force for the moving iron core 2 to move toward the first end 5.
[0061] The auxiliary spring 9 is located between the second abutment end 8 and the cavity, and can further assist the self-returning spring 11 described below in exerting an elastic force on the moving iron core 2, thereby enhancing the returning closing force when the moving iron core 2 moves toward the first end 5 to achieve return, thereby avoiding the phenomenon of insufficient returning closing force achieved by relying solely on the elastic force of the spring in the traditional way.
[0062] The connection method between the moving iron core 2 and the auxiliary spring 9 is not limited by the present application, and any of the following embodiments may be adopted:
[0063] Implementation method 1: Figure 3 As shown, a mounting cavity is provided at the second abutting end 8 of the moving iron core 2 facing the second end 6 of the cavity, and the mounting cavity extends a certain length along the axial direction but does not penetrate the moving iron core 2, and the shape of the mounting cavity of the moving iron core 2 is matched with the auxiliary spring 9, so that a partial area of the auxiliary spring 9 can be embedded in the mounting cavity, so the moving iron core 2 can cover a part of the auxiliary spring 9, so that part of the auxiliary spring 9 is hidden in the moving iron core 2, thereby improving the connection strength between the auxiliary spring 9 and the moving iron core 2, and shortening the space between the second abutting end 8 of the moving iron core 2 and the second end 6 of the cavity, thereby increasing the moving distance of the moving iron core 2 relative to the second end 6 of the cavity to a certain extent, and realizing the increase of the moving distance of the pushing member, and being able to appropriately reduce the volume of the fixed iron core 1 under the condition of the same moving distance, so as to be more suitable for occasions with space limitations.
[0064] Embodiment 2: An auxiliary spring 9 is connected between the end surface of the second abutting end 8 of the moving iron core 2 and the end surface of the second end 6 of the cavity, one end of the auxiliary spring 9 in the extension direction is abutted and connected to the second end 6 of the cavity, and the other end of the auxiliary spring 9 in the extension direction is abutted and connected to the end surface of the second abutting end 8 of the moving iron core 2. In this way, auxiliary springs 9 of different radial sizes can be selected, which is easy to install and disassemble.
[0065] As a preferred embodiment, the fixed iron core 1 has a positioning hole corresponding to the push-pull member 10, through which the connecting end of the push-pull member 10 can extend into the cavity and connect with the first abutting end 7 of the moving iron core 2, so as to form a moving channel for the push-pull member 10 to be linked with the moving iron core 2.
[0066] like Figure 3 As shown, the positioning hole passes through the side of the fixed iron core 1 facing the push-pull member 10, so that the push-pull member 10 can pass through the positioning hole to connect with the moving iron core 2 in the cavity, and the moving iron core 2 drives the push-pull member 10 to move along the moving channel formed by the positioning hole. If a sleeve 12 is provided on the outside of the push-pull member 10, the sleeve 12 moves along the moving channel together with the push-pull member 10.
[0067] As a preferred embodiment, Figure 3As shown, a sleeve 12 is also sleeved on the outside of the push-pull member 10, and the self-returning spring 11 is sleeved outside the sleeve 12. One end of the sleeve 12 in the axial direction can pass through the positioning hole and be connected to the moving iron core 2, and the other end of the sleeve 12 in the axial direction is connected to the transmission end.
[0068] The outer side of the push-pull member 10 can be directly connected to the self-returning spring 11, or the self-returning spring 11 can be arranged on the outer side of the push-pull member 10 through a sleeve 12. The purpose of arranging the sleeve 12 between the push-pull member 10 and the self-returning spring 11 is to increase the connection strength between the moving iron core 2 and the push-pull member 10 and ensure that sufficient pressure strength is generated. The sleeve 12 can support the push-pull member 10, and the sleeve 12 can only slide along the axial direction of the positioning hole, thereby limiting the push-pull member 10 in the radial direction, improving the positioning accuracy between the push-pull member 10 and the moving iron core 2, so that the push-pull member 10 can operate stably and effectively ensure the stable output of the push-pull force.
[0069] As a preferred embodiment, Figure 3 As shown, the length of the moving iron core 2 in the axial direction is not less than the length of the magnetic steel 3, so that a partial area of the moving iron core 2 can be inserted into the electromagnetic coil 4; the length of the moving iron core 2 perpendicular to the axial direction is less than the spacing between the magnetic steels 3 on both sides to form a moving gap, thereby reducing the resistance of the moving iron core 2 to move between the magnetic steels 3 on both sides.
[0070] Since the magnetic steel 3 is distributed at the first end 5 of the cavity, and the electromagnetic coil 4 is distributed at the second end 6 of the cavity, the magnetic steel 3 and the electromagnetic coil 4 are kept in a parallel distribution state in the cavity, and the moving iron core 2 is located in the middle of the cavity, that is, between the first end 5 and the second end 6. Since the moving iron core 2 can form an electromagnetic circuit with the electromagnetic coil 4 only when it is inserted into the electromagnetic coil 4, the length of the moving iron core 2 needs to exceed the length of the magnetic steel 3 so that the second abutting end 8 of the moving iron core 2 can enter the electromagnetic coil 4. Figure 3 As shown, a moving gap is formed between the magnets 3 on both sides and the moving iron core 2, that is, the distance between the magnet 3 and the moving iron core 2 is greater than zero. This arrangement ensures that the moving iron core 2 will not contact the magnet 3, and the moving iron core 2 will not contact and generate friction with the magnet 3 when moving left and right in the cavity, thereby reducing the resistance to movement.
[0071] Furthermore, if Figure 4 As shown, the width of the electromagnetic coil exceeds the width of the fixed iron core and protrudes beyond the fixed iron core. It is made of a hollow frame inside an insulating material and a wire wound on the frame. The moving iron core 2 is non-contactly inserted into the middle hole of the electromagnetic coil 4, and the moving iron core 2 can move axially along the middle hole of the electromagnetic coil 4.
[0072] Furthermore, the moving iron core 2 may be cylindrical or rectangular in shape, and the specific shape is not limited by the present application. It is made of pure iron that is easily magnetized and has the characteristic of no residual magnetism.
[0073] As a preferred embodiment, the fixed iron core 1 forms a closed structure so that the interior of the fixed iron core 1 has a closed space, and the electromagnetic circuit and the closed circuit can form a closed loop in the closed space.
[0074] The fixed iron core 1 is made of soft iron or silicon steel that is easily magnetized and loses its magnetism. The fixed iron core 1 adopts a closed structure so that the fixed iron core 1 forms a closed loop, such as Figure 1 and Figure 3 As shown, in the present embodiment, the fixed iron core 1 adopts a rectangular structure, and a positioning hole is provided along the X-axis direction on the side of the fixed iron core 1 facing the push-pull member 10, and a closed space, i.e., a cavity, is formed inside the fixed iron core 1, which can accommodate the magnetic steel 3, the moving iron core 2 and the electromagnetic coil 4, and can also ensure that the closed loop and the electromagnetic loop form a closed loop in the closed space, which is beneficial to enhancing the strength of the magnetic field, improving the return closing force and the push-pull force; wherein the positioning hole opened in the fixed iron core 1 is opened on the side and is used to pass the push-pull member 10 for power output, and therefore will not affect the closed loop of the magnetic circuit of the closed loop and the electromagnetic circuit.
[0075] As a preferred embodiment, Figure 3 As shown, the axial length of the moving iron core 2 is not less than the axial length of the electromagnetic coil 4 , so that the moving iron core 2 forms a transverse closed magnetic circuit in the cavity of the fixed iron core 1 .
[0076] The axial length of the moving iron core 2 is not less than the axial length of the electromagnetic coil 4, which means that the magnetic steel 3 and the electromagnetic coil 4 are arranged side by side inside the cavity. In order to prevent the moving iron core 2 from not being affected by the magnetic force generated by the magnetic steel 3 during the movement to the Y direction, the length of the moving iron core 2 along the transverse direction of the cavity needs to be greater than the length of the electromagnetic coil 4 along the transverse direction of the cavity. This can enable the moving iron core 2 to form a transverse closed magnetic circuit on one side of the cavity close to the second end, and also to form a transverse closed magnetic circuit on one side of the cavity close to the first end, thereby generating a magnetic field induction force in the X-axis or Y-axis direction, so that the moving iron core 2 is displaced along the X-axis or Y-axis.
[0077] Furthermore, the shape of the magnetic steel 3 can be a rectangular, semicircular or other shaped permanent magnet, and is not limited by the present application.
[0078] Furthermore, a mounting hole for connecting to an external device is reserved on the outer peripheral side of the fixed iron core 1 .
[0079] The parts not described in the present invention can be realized by adopting or drawing on the existing technology.
[0080] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.
[0081] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.
Claims
1. A DC self-homing electromagnet, characterized in that: It comprises a fixed iron core, a moving iron core, a magnetic steel, a return spring assembly and an electromagnetic coil; the moving iron core, the magnetic steel and the electromagnetic coil are installed in the cavity of the fixed iron core; the magnetic steel is installed at the first end of the cavity and is located on both sides of the moving iron core, and the electromagnetic coil is installed at the second end of the cavity and is nested outside the moving iron core; the return spring assembly is connected to the fixed iron core and is used to drive the moving iron core to move along the cavity; The moving iron core is configured as follows: when the electromagnetic coil is energized, the moving iron core, the electromagnetic coil, the magnetic steel and the fixed iron core form an electromagnetic circuit, and the moving iron core can move toward the second end; when the electromagnetic coil is de-energized, the moving iron core can move toward the first end under the action of the return spring assembly to achieve return, and the moving iron core, the magnetic steel and the fixed iron core form a closed magnetic circuit.
2. A DC self-homing electromagnet according to claim 1, characterized in that: The moving iron core has a first abutting end along the axial direction that can move toward the first end and can abut against the first end, and a second abutting end that can move toward the second end and abut against the second end; the first abutting end is connected to a push-pull member arranged outside the cavity, and the moving iron core can provide traction to the push-pull member when the second abutting end moves toward the second end.
3. A DC self-homing electromagnet according to claim 2, characterized in that: The push-pull member has a connection end extending into the cavity for connecting with the first abutting end of the moving iron core, and a transmission end arranged outside the cavity for outputting the magnetic force of the electromagnet.
4. A DC self-homing electromagnet according to claim 3, characterized in that: The return spring assembly includes a self-return spring, which is sleeved on the outside of the push-pull member, one end of the self-return spring in the extension direction abuts against the transmission end of the push-pull member, and the other end of the self-return spring in the extension direction abuts against the outer wall of the fixed iron core.
5. A DC self-homing electromagnet according to claim 4, characterized in that: The return spring assembly also includes an auxiliary spring, and an auxiliary spring is connected between the second abutting end of the moving iron core and the inner wall of the cavity; the auxiliary spring can provide a driving force for the moving iron core to move toward the first end.
6. A DC self-homing electromagnet according to claim 5, characterized in that: The fixed iron core has a positioning hole corresponding to the push-pull member, through which the connecting end of the push-pull member can extend into the cavity and connect with the first abutting end of the moving iron core to form a moving channel for the push-pull member to be linked with the moving iron core.
7. A DC self-homing electromagnet according to claim 6, characterized in that: A sleeve is also sleeved on the outside of the push-pull member, the self-returning spring is sleeved outside the sleeve, one end of the sleeve in the axial direction can pass through the positioning hole and be connected to the moving iron core, and the other end of the sleeve in the axial direction is connected to the transmission end.
8. A DC self-homing electromagnet according to claim 1, characterized in that: The length of the moving iron core in the axial direction is not less than the length of the magnetic steel, so that a partial area of the moving iron core can be inserted into the electromagnetic coil; the length of the moving iron core perpendicular to the axial direction is less than the spacing between the magnetic steels on both sides to form a moving gap, so that the moving iron core can move along the axial direction.
9. A DC self-homing electromagnet according to claim 1, characterized in that: The fixed iron core is formed into a ring-shaped structure so that there is a closed space inside the fixed iron core, and the electromagnetic circuit and the closed circuit can form a closed loop in the closed space.
10. A DC self-homing electromagnet according to claim 1, characterized in that: The length of the moving iron core in the axial direction is not less than the length of the electromagnetic coil in the axial direction, so that the moving iron core forms a transverse closed magnetic circuit in the cavity of the fixed iron core.