One-way self-recovery electromagnet
By designing the closed chamber structure and the low-level high-level control of the electromagnet, the problem of the electromagnet's movement of the core in harsh environments is solved, and the stable locking and automatic reset functions are realized in harsh environments. Improves the service life and stability of the equipment.
Patent Information
- Application Number
- CN202411553221.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2024-12-13
AI Technical Summary
Existing electromagnets are susceptible to oxidation and corrosion in harsh environments, resulting in the movement of the moving iron core not moving smoothly and unable to effectively maintain locking or resetting, affecting the normal use of the equipment.
A one-way self-repellent solenoid is designed, adopting a closed chamber structure, the inner core and the moving iron core are connected by elastic parts, the outer side of the spool is wound, and the solenoid is controlled by low-level and high-level connection components. The working state ensures that it remains locked when powered on and automatically reset when powered off.
It effectively avoids external erosion, improves the service life and stability of the electromagnet, ensures the smooth movement and automatic reset function of the moving iron core in harsh environments, and ensures the normal operation of the equipment.
Smart Images
Figure CN119132786A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field related to electromagnets, and in particular to a one-way self-resetting electromagnet. Background Art
[0002] An electromagnet is a device that generates electromagnetism when electricity is applied. A conductive winding that matches its power is wound around the outside of the iron core. This coil with current passing through it has magnetism like a magnet. It is also called an electromagnet, and the effect of an electromagnet is usually used in switches.
[0003] The existing electromagnetic lock for rail transit platform safety door, application number CN201220644897.8, consists of four parts: power part, execution part, detection device, protection and installation device; the electromagnetic armature is installed in the inner cavity of the electromagnetic body to make reciprocating motion; the electromagnetic body is fixed on the lower cover; the upper cover and the lower cover are respectively installed at the two ends of the shell with bolts; the micro switch is fixed on the mounting plate with bolts, and the mounting plate is fixed inside the shell; the linear bearing is installed in the hole of the upper cover, the moving iron core is inserted in the linear bearing, and the limit shock pad is located between the limit plate and the linear bearing. It can be seen that the electromagnetic core set at a single end pulls the iron core on one side to move, and when powered on, the moving iron core moves downward to disengage from the lock core, thereby opening the lock. It is not applicable in some scenarios that need to be powered on and kept closed. It can be seen that the spring works in a condition that is not relatively closed. If it works under some complex and harsh conditions, the moving iron core and spring will be oxidized and corroded, losing their original elasticity, and there is no way to reset the moving iron core well.
[0004] Another example is the electromagnetic door lock used in a microwave oven. If a door lock made of a general electromagnet is used, it will often be corroded by oil smoke, water vapor, and dust, and may be improperly used, and the elasticity of the spring will fail, making the moving iron core move unsmoothly, unable to be pushed out or returned in time, which will cause the microwave oven door to be unable to be used normally. For example, after the heating is completed, the door cannot be opened normally, or the door is opened by mistake before the heating is completed. Furthermore, the electromagnetic door lock of the microwave oven needs to keep the door lock in a normally closed state when the power is on. It only takes a moment to restart the moving iron core to move quickly, and then keep it attracted in a low-level state, that is, the door is normally closed. Summary of the invention
[0005] The object of the present invention is to provide a one-way self-resetting electromagnet to overcome the deficiencies in the prior art.
[0006] In order to achieve the above object, the present invention provides the following technical solutions: A one-way self-resetting electromagnet comprises a yoke, a bobbin is fixedly provided on the inner side wall of the yoke, a closed chamber is provided inside the bobbin, a fixed iron core is fixedly provided in the closed chamber, a moving iron core is slidably provided in the closed chamber, the fixed iron core is equipped with an elastic member, the elastic member is arranged in the closed chamber, the moving iron core is movably connected to the fixed iron core through the elastic member, the fixed iron core is a ring structure, one end of the moving iron core passes through the fixed iron core and the yoke, a coil is wound around the outside of the bobbin, a pin electrically connected to the coil is fixedly provided on the bobbin, and a connecting component connected to a low level or a high level is welded to the pin.
[0007] To further explain, an upper cover is fixedly provided at the bottom of the yoke, the upper cover and the yoke form a winding chamber, the bobbin is arranged in the winding chamber, one end of the bobbin also passes through the upper cover to extend outward, and the bobbin is fixedly connected to the upper cover.
[0008] To further explain, the bobbin is a sleeve-like structure, one end of the bobbin is provided with an opening, and the end of the opening of the bobbin is also extended outward along the edge to be integrally formed with a sealed cover plate, the yoke is provided with a through hole for the moving iron core to pass through, the end of the bobbin provided with the opening covers the through hole, and the sealed cover plate is sealed and fixedly connected to the inner wall of the yoke.
[0009] To further explain, the yoke iron is provided with a through hole for the moving iron core to pass through, and a sealed iron ring is fixedly provided at the through hole, and the sealed iron ring abuts against the moving iron core.
[0010] To further explain, the side wall of the spool is provided with a positioning cover plate, which is fixedly connected to the inner wall of the upper cover, and the positioning cover plate is integrally formed and extended with a connecting portion, which is embedded and fixedly connected to the upper cover, and the pin is fixedly arranged on the connecting portion.
[0011] To further explain, the elastic part is a spring, the moving iron core and the fixed iron core are provided with outer steps, the spring is sleeved on the moving iron core and the fixed iron core, the two ends of the spring are respectively abutted against the outer steps provided on the moving iron core and the fixed iron core, and the fixed iron core includes an extension rod, which passes through the fixed iron core and the armature.
[0012] To further explain, there are at least two pins, and the connecting components include a low-level connecting wire, a common wire and a high-level connecting wire. The low-level connecting wire and the high-level connecting wire are welded to the same pin, and the common wire is welded to one of the pins separately. One end of the low-level connecting wire, the common wire and the high-level connecting wire are all fixedly connected to a connecting plug.
[0013] To further elaborate, a resistor is connected in series with the low level connection line.
[0014] To further explain, a limiting truncated cone is arranged on the moving iron core, and a conical recessed hole corresponding to the limiting truncated cone is arranged in the fixed iron core.
[0015] Compared with the prior art, the present invention has the following beneficial effects: The yoke iron of the present invention is formed into an integral structure, which increases the reliability of the structure. The internal movable part is controlled in a predetermined space and is provided with a closed bobbin. The moving iron core and the spring are arranged in the closed bobbin, which can effectively avoid the erosion of external oil smoke, water vapor and dust, and improve the service life. The traditional wiring process is changed to a wire welding process by optimizing the PIN pin structure of the bobbin to increase efficiency and improve quality. The wire connected to the electromagnet coil is equipped with two energized circuits, which can start the high level of the coil and then switch to a low level to maintain it. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention ignoring the coil; Figure 3 The cross-sectional view of the spool is ignored for the present invention; Figure 4 It is a schematic diagram of the structure of the connection assembly of the present invention.
[0017] Notes on the attached drawings: 1. Yoke; 2. Bobbin; 3. Moving iron core; 4. Fixed iron core; 5. Extension rod; 6. Outer step; 7. Spring; 8. Sealed cover; 9. Positioning cover; 10. Upper cover; 11. Sealed iron ring; 12. Connecting part; 13. Pin; 14. High-level connecting line; 15. Low-level connecting line; 16. Common line; 17. Resistor; 18. Connecting plug; 19. Limiting cone; 20. Conical recess; 21. Coil. DETAILED DESCRIPTION
[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.
[0019] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. When the number of an element is referred to as "plurality", it may be any number of two or more. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.
[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.
[0021] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings: like Figure 1-4 As shown, in this embodiment, a one-way self-resetting electromagnet is provided. The present invention is more suitable for use in an environment with relatively harsh environment, rich in oil smoke, water vapor or dust, including the scenario of use in the door lock of a microwave oven. The present invention includes a yoke 1, and a bobbin 2 is fixedly provided on the inner wall of the yoke 1. The bobbin 2 is a sleeve-shaped structure, and a cylindrical closed chamber is provided inside the bobbin 2. A fixed iron core 4 is fixedly provided in the closed chamber, and a moving iron core 3 is slidably provided in the closed chamber. In this embodiment, the fixed iron core 4 and the moving iron core 3 are preferably made into a structure with a circular cross-section, so that the moving iron core 3 can move in the closed chamber.
[0022] The fixed iron core 4 is equipped with an elastic member, and the elastic member is arranged in a closed chamber. The elastic member preferably uses a spring 7. In order to ensure the reliability of the spring 7, one end of the spring 7 can be optionally fixedly connected to the fixed iron core 4. In this embodiment, the moving iron core 3 and the fixed iron core 4 are provided with an outer step 6, and the spring 7 is sleeved on the moving iron core 3 and the fixed iron core 4. The two ends of the spring 7 are respectively abutted against the outer step 6 provided on the moving iron core 3 and the fixed iron core 4. The moving iron core 3 is movably connected to the fixed iron core 4 through the spring 7. Specifically, after the moving iron core 3 is pulled out after being excited by the external coil 21, it can be reset and retracted by the above-mentioned spring 7. The fixed iron core 4 is preferably an annular structure to facilitate the moving iron core 3 to pass through and be pushed outward. One end of the moving iron core 3 passes through the fixed iron core 4 and the yoke 1. A coil 21 is wound around the outside of the bobbin 2. The bobbin 2 is fixed with a pin 13 electrically connected to the coil 21. The pin 13 is welded with a connecting component that connects a low level or a high level. The coil 21 is energized and excited through the pin 13 and the connecting component to control one end of the moving iron core 3 to be pushed outward to limit the door lock, thereby achieving the normally closed state of the door lock when the power is on.
[0023] In this embodiment, an upper cover 10 is fixedly provided at the bottom of the yoke 1, and the upper cover 10 and the yoke 1 are arranged to form a winding chamber, and the bobbin 2 is arranged in the winding chamber. The winding chamber specifically does not refer to an enclosed space, but a place that limits the winding range of the coil 21. One end of the bobbin 2 also extends outward through the upper cover 10. A nearly circular hole groove is provided in the middle of the upper cover 10 to facilitate the installation of the positioning cover plate 9 (mentioned below), which can further limit the relative position of the bobbin 2 on the yoke 1 to ensure that the moving iron core 3 moves in a vertical linear direction when moving, which helps to guide the movement of the moving iron core 3; improve the overall reliability of the present invention and the stability of the movement of the moving iron core 3; after positioning, the bobbin 2 is also fixedly connected to the upper cover 10.
[0024] In this embodiment, the fixed iron core 4 includes an extension rod 5, which needs to penetrate the fixed iron core 4 and the armature to limit the door lock on the outer side of the yoke 1, so an opening is set at one end of the bobbin 2, and the extension rod 5 is convenient to be ejected outward through this opening. The end of the bobbin 2 with the opening is also extended outward along the edge and is integrally formed with a sealed cover plate 8. The yoke 1 is provided with a through hole for the moving iron core 3 to pass through. The end of the bobbin 2 with the opening is covered at the through hole, and the sealed cover plate 8 is sealed and fixedly connected to the inner side wall of the yoke 1, thereby ensuring that the inside of the bobbin 2 is a relatively closed space. Preferably, a limiting cone 19 is provided on the moving iron core 3, and the limiting cone 19 is specifically provided at the root of the extension rod 5, and a conical recessed hole 20 corresponding to the limiting cone 19 is also provided in the fixed iron core 4. Under the control of the conical recessed hole 20 and the limiting cone 19, the extension rod 5 can be stopped after being extended to the right position. At the same time, the conical recessed hole 20 provided in the fixed iron core 4 can help reduce the need for guiding when the moving iron core 3 is extended to avoid severe collision.
[0025] In this embodiment, the yoke 1 is provided with a through hole for the moving iron core 3 to pass through, and a sealed iron ring 11 is fixedly provided at the through hole. Preferably, the sealed iron ring 11 abuts against the moving iron core 3 (that is, the extension rod 5). Furthermore, a protective lubricating oil can be applied to the abutting portion between the sealed iron ring 11 and the moving iron core 3 to reduce friction.
[0026] In this embodiment, the side wall of the spool 2 is provided with a positioning cover plate 9, and the positioning cover plate 9 is fixedly connected to the inner wall of the upper cover 10. The positioning cover plate 9 is integrally formed and extended with a connecting portion 12, and the connecting portion 12 is embedded and fixedly connected to the upper cover 10. The pin 13 is fixedly arranged on the connecting portion 12, and the pin 13 is electrically connected to the connecting component.
[0027] There are at least two pins 13, and two pins 13 are preferably used in this embodiment. The connection assembly includes a low-level connection line 15, a common line 16, and a high-level connection line 14. The low-level connection line 15 and the high-level connection line 14 are welded to the same pin 13, and the common line 16 is welded to one of the pins 13. One end of the low-level connection line 15, the common line 16, and the high-level connection line 14 are fixedly connected to a connection plug 18. The pins 13 connected to the low-level connection line 15 and the high-level connection line 14 will switch to select one of the connection lines. The low-level connection line 15 is connected in series with a resistor 17.
[0028] The working principle is that the common line 16 and one of the connecting lines form a loop for the coil 21 and the power supply. During this period, the coil 21 will work at two different levels due to the switching of the connecting line. The electromagnet coil 21 is started by connecting the high-level connecting line 14 (high power); after starting to the end (that is, the extension rod 5 is pushed out in place), the low-level connecting line 15 is energized. After 200ms of power-on, the external circuit disconnects the high-level connecting line 14, and the low-level connecting line 15 is connected for a long time (low power). In the energized state, the extension rod 5 will be pushed out to realize the closure of the door lock, and the door of the microwave oven is closed and cannot be opened, ensuring that the door is not opened when the microwave oven is used normally. In the power-off state, the extension rod 5 is reset and retracted under the action of the spring 7 to realize the normal opening of the door lock, and the door of the microwave oven can be opened normally.
[0029] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered as within the scope of this specification. For ordinary technicians in this field, they can make several modifications and improvements without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.
Claims
1. One-way self-resetting electromagnet, characterized by: It includes a yoke, a bobbin is fixedly provided on the inner side wall of the yoke, a closed chamber is provided inside the bobbin, a fixed iron core is fixedly provided in the closed chamber, a moving iron core is slidably provided in the closed chamber, the fixed iron core is equipped with an elastic part, the elastic part is arranged in the closed chamber, the moving iron core is movably connected to the fixed iron core through the elastic part, the fixed iron core is a ring structure, one end of the moving iron core passes through the fixed iron core and the yoke, a coil is wound around the outside of the bobbin, a pin electrically connected to the coil is fixedly provided on the bobbin, and a connecting component connected to a low level or a high level is welded to the pin.
2. The one-way self-resetting electromagnet according to claim 1, characterized in that: An upper cover is fixedly arranged at the bottom of the yoke, and the upper cover and the yoke are arranged to form a winding chamber. The bobbin is arranged in the winding chamber, and one end of the bobbin also passes through the upper cover to extend outward, and the bobbin is fixedly connected to the upper cover.
3. The one-way self-resetting electromagnet according to claim 1, characterized in that: The bobbin is a sleeve-shaped structure with an opening at one end. The end of the opening of the bobbin is extended outward along the edge and is integrally formed with a sealed cover plate. The yoke is provided with a through hole for the moving iron core to pass through. The end of the bobbin with the opening covers the through hole, and the sealed cover plate is sealed and fixedly connected to the inner wall of the yoke.
4. The one-way self-resetting electromagnet according to claim 1, characterized in that: The yoke iron is provided with a through hole for the moving iron core to pass through, and a sealed iron ring is fixedly arranged at the through hole, and the sealed iron ring abuts against the moving iron core.
5. The one-way self-resetting electromagnet according to claim 1, characterized in that: The side wall of the spool is sleeved with a positioning cover plate, which is fixedly connected to the inner wall of the upper cover. The positioning cover plate is integrally formed and extended with a connecting portion, which is embedded and fixedly connected to the upper cover, and the pin is fixedly arranged on the connecting portion.
6. The one-way self-resetting electromagnet according to claim 1, characterized in that: The elastic part is a spring, the moving iron core and the fixed iron core are provided with outer steps, the spring is sleeved on the moving iron core and the fixed iron core, the two ends of the spring are respectively in contact with the outer steps provided on the moving iron core and the fixed iron core, and the fixed iron core includes an extension rod, which passes through the fixed iron core and the armature.
7. The one-way self-resetting electromagnet according to claim 1, characterized in that: There are at least two pins, and the connecting components include a low-level connecting wire, a common wire and a high-level connecting wire. The low-level connecting wire and the high-level connecting wire are welded to the same pin, and the common wire is welded to one of the pins separately. One end of the low-level connecting wire, the common wire and the high-level connecting wire are fixedly connected to a connecting plug.
8. The one-way self-resetting electromagnet according to claim 7, characterized in that: The low level connection line has a resistor in series.
9. The one-way self-resetting electromagnet according to claim 1, characterized in that: A limiting truncated cone is arranged on the moving iron core, and a conical concave hole corresponding to the limiting truncated cone is arranged in the fixed iron core.