One-way self-recovery electromagnet

Abstract

The utility model discloses a one-way self-resetting electromagnet which comprises a yoke, a bobbin fixedly arranged on the inner side wall of the yoke, a closed cavity arranged in the bobbin, a fixed iron core fixedly arranged in the closed cavity, a movable iron core arranged in the closed cavity in a sliding mode, an elastic piece arranged on the fixed iron core and arranged in the closed cavity. The movable iron core is movably connected with the fixed iron core through an elastic piece, the fixed iron core is of an annular structure, one end of the movable iron core penetrates through the fixed iron core and the yoke, a coil is wound around the outer side of the bobbin, the bobbin is fixedly provided with a contact pin electrically connected with the coil, and the contact pin is welded with a connecting assembly communicated with a low level or a high level; according to the utility model, erosion of external oil smoke, water vapor and dust can be effectively avoided, and the service life is prolonged; by optimizing the structure of inserting the PIN into the bobbin and changing the wire welding process, the efficiency is improved, the quality is improved, the wire connected out of the electromagnet coil is provided with two electrified loops, and the high level of the coil can be started and then switched to the low level to be kept.

Description

Technical Field

[0001] The utility model relates to the technical field related to electromagnets, in particular to a one-way self-resetting electromagnet. Background Art

[0002] An electromagnet is a device that generates electromagnetic fields when electricity is applied. A conductive winding of appropriate power is wound around an iron core. This coil, carrying current, becomes magnetic, like a magnet. It is also called an electromagnet, and its effect is often used in switches.

[0003] The existing electromagnetic lock for rail transit platform security doors, application number CN201220644897.8, consists of four parts: a power unit, an actuator, a detection device, and a protection and mounting device. The electromagnetic armature is mounted within the inner cavity of the electromagnet body, reciprocating. The electromagnet body is fixed to the lower cover. The upper and lower covers are bolted to either end of the housing. A microswitch is bolted to a mounting plate, which is fixed to the interior of the housing. A linear bearing is mounted within a hole in the upper cover, the moving iron core is inserted into the linear bearing, and a limit damping pad is located between the limit plate and the linear bearing. It can be seen that the electromagnetic core, located at one end, pulls the iron core on one side to move. When powered, this causes the moving iron core to move downward, disengaging the lock cylinder and unlocking the lock. This is not applicable in scenarios where the lock needs to remain closed while powered. It can be seen that the spring works in a relatively closed condition. 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 solenoid door lock used in microwave ovens. Using a conventional electromagnet is often subject to corrosion from oil smoke, moisture, and dust. Improper use can also lead to spring failure, resulting in the movable core moving unevenly, unable to be ejected or retracted in a timely manner, and causing the microwave door to malfunction. For example, the door may not open properly after heating is complete, or it may be accidentally opened before heating is complete. Furthermore, the solenoid door lock of a microwave oven must maintain a normally closed position when powered on. Simply restarting the lock allows the movable core to move rapidly, and then maintains a low-voltage state to close the door, effectively locking it to its normally closed position. Summary of the Invention

[0005] The purpose of the utility model is to provide a one-way self-resetting electromagnet to overcome the deficiencies in the prior art.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A one-way self-resetting electromagnet 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, and a pin electrically connected to the coil is fixedly provided on the bobbin, and the pin is welded with a connecting component connecting a low level or a high level.

[0008] To further explain, an upper cover is fixedly provided at the bottom of the yoke, and the upper cover and the yoke form a winding chamber. The bobbin is arranged in the winding chamber, and one end of the bobbin also extends outward through the upper cover, and the bobbin is fixedly connected to the upper cover.

[0009] To further explain, the bobbin is a sleeve-shaped 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 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, and the end of the bobbin with the opening is covered at the through hole, and the sealed cover plate is sealed and fixedly connected to the inner wall of the yoke.

[0010] To further elaborate, 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.

[0011] To further explain, the side wall of the spool is provided with a positioning cover, which is fixedly connected to the inner wall of the upper cover. The positioning cover is integrally formed and extended with a connecting portion, which is embedded and fixedly connected to the upper cover, and the pin is fixedly set on the connecting portion.

[0012] 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 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.

[0013] To further explain, there are at least two pins, and the connecting components include a low-level connecting line, a common line and a high-level connecting line. The low-level connecting line and the high-level connecting line are welded to the same pin, and the common line is welded to one of the pins separately. One end of the low-level connecting line, the common line and the high-level connecting line are all fixedly connected to a connecting plug.

[0014] To further elaborate, the low-level connection line is connected in series with a resistor.

[0015] To further elaborate, a limiting truncated cone is provided on the moving iron core, and a conical recessed hole corresponding to the limiting truncated cone is provided in the fixed iron core.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The utility model has an integrated yoke structure, which increases the reliability of the structure. The internal movable parts are controlled in a predetermined space and are provided with a sealed bobbin. The moving iron core and the spring are arranged in the sealed bobbin, which can effectively avoid the erosion of external oil smoke, water vapor and dust, thereby increasing the service life.

[0018] The traditional wiring process is changed to a wire welding process by optimizing the spool PIN pin structure to increase efficiency and improve quality. The wire connected to the electromagnet coil is equipped with two energized circuits, which can start the coil at a high level and then switch to a low level to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the utility model ignoring the coil;

[0021] Figure 3 This is a cross-sectional view of the utility model ignoring the spool;

[0022] Figure 4 This is a schematic diagram of the connection component structure of the present utility model.

[0023] Description of the accompanying drawings:

[0024] 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

[0025] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] 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 also be an element centered thereon. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may also be an element centered thereon. When the number of an element is referred to as having "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 do not represent the only implementation method.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended solely for the purpose of describing specific embodiments and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings:

[0029] like Figure 1-4 As shown, in this embodiment, a one-way self-resetting electromagnet is provided. The utility model is more suitable for use in harsh environments, environments with a lot of oil smoke, water vapor or dust, including scenarios where it is used in the door lock of a microwave oven. The utility model 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.

[0030] The fixed iron core 4 is equipped with an elastic part, which is arranged in a closed chamber. The elastic part 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 in contact with the outer steps 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 so that the moving iron core 3 can 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 push outward to limit the door lock, thereby realizing the normally closed state of the door lock when the power is on.

[0031] 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 utility model 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.

[0032] In this embodiment, the fixed core 4 includes an extension rod 5. The extension rod 5 needs to pass through the fixed core 4 and the armature to restrict the door lock on the outside of the yoke 1. Therefore, an opening is provided at one end of the spool 2, and the extension rod 5 can be easily ejected outward through this opening. The end of the spool 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 core 3 to pass through. The end of the spool 2 with the opening is covered at the through hole. The sealed cover plate 8 is sealed and fixedly connected to the inner side wall of the yoke 1, thereby ensuring that the interior of the spool 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 extended into place and then stopped. At the same time, the conical recessed hole 20 provided in the fixed iron core 4 can help reduce the need for correction when the moving iron core 3 is extended to avoid violent collisions.

[0033] 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.

[0034] In this embodiment, the side wall of the spool 2 is provided with a positioning cover plate 9, which 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, which is embedded and fixedly connected to the upper cover 10. The pin 13 is fixedly set on the connecting portion 12, and the pin 13 is electrically connected to the connecting component.

[0035] There are at least two pins 13, and in this embodiment, two pins 13 are preferably used. 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 soldered to the same pin 13, while the common line 16 is soldered to a separate pin 13. One end of each of the low-level connection line 15, the common line 16, and the high-level connection line 14 is 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 connect to one of the connection lines. The low-level connection line 15 is connected in series with a resistor 17.

[0036] The operating principle is as follows: Common line 16 and one of the connecting lines form a loop between coil 21 and the power supply. During this time, due to the switching of the connecting lines, coil 21 operates at two different voltage levels. The electromagnet coil 21 is activated by connecting the high-level connecting line 14 (high power). After fully activated (i.e., when the extension rod 5 is pushed out), the low-level connecting line 15 is energized. After 200ms of energization, the external circuit disconnects the high-level connecting line 14, while the low-level connecting line 15 remains connected (low power). When powered on, the extension rod 5 is pushed out, closing the door lock and preventing it from opening, ensuring that the door cannot be opened during normal use. When powered off, the extension rod 5 is reset by the spring 7, returning the door lock to its normal state, allowing the microwave oven door to open normally.

[0037] The technical features of the above-described embodiments can be combined in any manner. To simplify the description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there are no contradictions in the combination of these technical features, they should be considered to be within the scope of this specification. For those skilled in the art, without departing from the concept of the utility model, they can also make several variations and improvements, which fall within the scope of protection of the utility model. Therefore, the scope of protection of this utility model patent shall be based on the appended 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, and a pin electrically connected to the coil is fixedly provided on the bobbin, and the pin is welded with a connecting component connected to a low level or a high level.

2. The one-way self-resetting electromagnet according to claim 1, characterized in that: An upper cover is fixedly provided at the bottom of the yoke, and the upper cover and the yoke form a winding chamber. The bobbin is arranged in the winding chamber, and one end of the bobbin also extends outward through the upper cover, 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 and is integrally formed with a sealed cover. The yoke is provided with a through hole for the moving iron core to pass through. The end of the bobbin with the opening is covered with the through hole, and the sealed cover 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 provided with a positioning cover, which is fixedly connected to the inner wall of the upper cover. The positioning cover is integrally formed and extended with a connecting portion, which is embedded and fixedly connected to the upper cover, and the pin is fixedly set 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 line, a common line and a high-level connecting line. The low-level connecting line and the high-level connecting line are welded to the same pin, and the common line is welded to one of the pins separately. One end of the low-level connecting line, the common line and the high-level connecting line are all 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 provided on the moving iron core, and a conical concave hole corresponding to the limiting truncated cone is provided in the fixed iron core.

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