Self-reset current overload protection device

Abstract

The utility model discloses a self-reset current overload protection device, which comprises a shell, a first conductive piece, a second conductive piece and a driving piece, and is characterized in that the first conductive piece is fixedly arranged on the shell; the second conductive part is rotatably arranged on the shell and located on one side of the first conductive part, a plurality of contacts are arranged on the circumferential wall of the second conductive part in a protruding mode, and the contacts are arranged in the circumferential direction of the first conductive part at intervals. The second conductive piece rotates to enable the plurality of contacts to be in contact with or separated from the first conductive piece in sequence; the driving part is in transmission connection with the second conductive part so as to drive the second conductive part to rotate. According to the technical scheme, when one contact is damaged, other contacts can continue to be used, and normal use of the device is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of overload protection, in particular to a self-resetting current overload protection device. Background Art

[0002] Self-resetting overcurrent protection devices are crucial protective devices in power systems, primarily designed to prevent equipment damage and potential safety hazards caused by excessive current in the circuit. These devices automatically disconnect the circuit when an overcurrent is detected and automatically restore power after the fault is resolved, eliminating the need for human intervention. This significantly improves the safety and reliability of the circuit system. Self-resetting overcurrent protection devices are widely used in a variety of fields, including industrial production, building power systems, and household appliances.

[0003] Existing self-resetting current overload protection devices typically utilize a design with fixed contacts and a single moving contact. When an overcurrent is detected, the moving contact is driven apart from the fixed contact by a spring or electromagnetic force, thereby disconnecting the circuit. However, this design has several significant drawbacks: First, the single moving contact is susceptible to wear due to frequent operation, reducing the device's service life. Second, the traditional linear motion contact mechanism can become stuck or experience poor contact after long-term use, affecting device reliability. Finally, existing designs make it difficult to automatically replace contacts. Damage to a contact often necessitates replacing the entire device, increasing maintenance costs. Utility Model Content

[0004] The main purpose of the utility model is to provide a self-resetting current overload protection device, which aims to solve the problem that when the contacts of the overload protection device in the prior art are damaged, the entire device often needs to be replaced, which increases maintenance costs.

[0005] To achieve the above-mentioned purpose, the self-resetting current overload protection device proposed in the utility model includes a shell, a first conductive member, a second conductive member and a driving member, the first conductive member is fixedly mounted on the shell; the second conductive member is rotatably provided on the shell and is located on one side of the first conductive member, a plurality of contacts are protruding from the peripheral wall of the second conductive member, the plurality of contacts are arranged at intervals in the circumferential direction of the first conductive member, and the rotation of the second conductive member can make the plurality of contacts contact or separate with the first conductive member in turn; the driving member is transmission-connected to the second conductive member to drive the second conductive member to rotate.

[0006] Optionally, the second conductive member has a rotation axis;

[0007] The cross section of the second conductive member in a plane perpendicular to the rotation axis is circular;

[0008] The plurality of contacts are distributed equidistantly on the peripheral wall of the second conductive member.

[0009] Optionally, each of the contacts protrudes from the peripheral wall surface of the second conductive member at the same height.

[0010] Optionally, the surface of each contact is a convex arc surface.

[0011] Optionally, the first conductive part includes a fixed part, a conductive part and an elastic part, the fixed part is fixedly mounted on the shell, the conductive part is slidably provided on the fixed part, the conductive part has a contact surface for contacting the contact, the elastic part is provided between the fixed part and the conductive part, and the elastic part is used to apply an elastic force to the conductive part so that the contact surface elastically abuts against the contact.

[0012] Optionally, the fixing portion is provided with a mounting groove, and two opposite groove side walls of the mounting groove are respectively provided with sliding grooves, and the sliding grooves extend in the depth direction of the mounting groove;

[0013] The conductive portion includes a body and a sliding portion, the contact surface is formed on the body, the sliding portion is connected to the side of the body facing away from the contact surface, the sliding portion extends into the mounting groove, and sliding protrusions are provided on both sides of the sliding portion, the two sliding protrusions correspond to the two sliding grooves one by one, and the sliding protrusions can be slidably inserted into the corresponding sliding grooves;

[0014] One end of the elastic portion is connected to the bottom wall of the mounting groove, and the other end is connected to the sliding portion.

[0015] Optionally, the sliding portion is arranged in a rod shape, the elastic portion is a spring, a part of the spring structure is sleeved on the sliding portion, and one end of the spring away from the bottom wall of the installation groove abuts against the sliding protrusion.

[0016] The self-resetting current overload protection device of the present utility model, through the innovative design of a rotatable second conductive member and multiple contacts, effectively solves the problems in the prior art of easy wear of a single contact, low reliability of the linear motion mechanism, and difficulty in achieving automatic replacement. Specifically, the provision of multiple contacts on the second conductive member enables the automatic rotation of the contacts, greatly extending the overall service life of the device; the rotatable design replaces the traditional linear motion mechanism, improving long-term reliability; at the same time, the configuration of multiple contacts allows the second conductive member to be controlled by the drive member to rotate to the next contact position when one contact is worn, thus achieving automatic replacement of the contacts without having to replace the entire device, thereby significantly reducing maintenance costs. In addition, this rotary design can also achieve a smoother contact and separation process, reduce arc generation, and further improve the safety and stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0018] Figure 1 This is a structural diagram of an embodiment of the self-resetting current overload protection device of the utility model;

[0019] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0020] Description of Figure Numbers:

[0021] 1. Shell; 2. First conductive member; 21. Fixed portion; 212. Mounting groove; 213. Slide groove; 22. Conductive portion; 221. Main body; 221a. Contact surface; 222. Sliding portion; 223. Sliding protrusion; 23. Elastic portion; 3. Second conductive member; 4. Contact.

[0022] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, the descriptions of "first", "second", etc. in this utility model are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, "and / or" in the full text includes three solutions. Taking A and / or B as an example, it includes technical solution A, technical solution B, and technical solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, and must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0026] The utility model provides a self-resetting current overload protection device.

[0027] In the embodiment of the present utility model, Figure 1 and Figure 2 As shown, the self-resetting current overload protection device includes a shell 1, a first conductive member 2, a second conductive member 3 and a driving member. The first conductive member 2 is fixedly mounted on the shell 1; the second conductive member 3 is rotatably provided on the shell 1 and is located on one side of the first conductive member 2. A plurality of contacts 4 are protruding from the peripheral wall of the second conductive member 3. The plurality of contacts 4 are arranged at intervals in the circumferential direction of the first conductive member 2. The rotation of the second conductive member 3 can make the plurality of contacts 4 contact or separate with the first conductive member 2 in sequence; the driving member is transmission-connected to the second conductive member 3 to drive the second conductive member 3 to rotate.

[0028] Specifically, the housing 1 is the outer structure of the entire device, used to accommodate and protect the various components inside. The housing 1 can be made of insulating materials, such as engineering plastics or other suitable insulating materials to ensure electrical safety.

[0029] The first conductive part 2 is fixedly mounted on the shell 1 and is an important part of current conduction. The first conductive part 2 can be made of a highly conductive metal material, such as copper or copper alloy, to ensure good conductive performance. The second conductive part 3 can rotate in the shell 1 and is located on one side of the first conductive part 2. A plurality of contacts 4 are protruding from the peripheral wall of the second conductive part 3, and these contacts 4 are spaced apart in the circumferential direction of the first conductive part 2. The second conductive part 3 can be a cylindrical or disc-shaped structure, and the material should also be a highly conductive metal. The contacts 4 can be made of wear-resistant and high-temperature resistant alloy materials, such as silver alloy or copper-tungsten alloy.

[0030] The driving member is in transmission connection with the second conductive member 3 and is used to drive the second conductive member 3 to rotate. The driving member can be a motor, a stepping motor or other types of driving devices, which can accurately control the rotation angle and speed of the second conductive member 3.

[0031] When the second conductive member 3 rotates, the plurality of contacts 4 can sequentially contact or separate from the first conductive member 2. This design enables the device to connect and disconnect the circuit, thereby achieving the purpose of overload protection.

[0032] It can be understood that the self-resetting current overload protection device of the technical solution of the present invention effectively solves the problems of easy wear of a single contact 4, low reliability of the linear motion mechanism, and difficulty in automatic replacement in the prior art by adopting an innovative design of a rotatable second conductive member 3 and multiple contacts 4. Specifically, the provision of multiple contacts 4 on the second conductive member 3 realizes the automatic rotation of the contacts 4, greatly extending the overall service life of the device; the rotatable design replaces the traditional linear motion mechanism, improving the reliability of long-term use; at the same time, the configuration of multiple contacts 4 makes it possible to control the second conductive member 3 to rotate to the next contact 4 position when one contact 4 is worn through the drive member, realizing the automatic replacement of the contacts 4 without replacing the entire device, thereby significantly reducing maintenance costs. In addition, this rotary design can also achieve a smoother contact and separation process, reduce the generation of arcs, and further improve the safety and stability of the device.

[0033] Optionally, the second conductive member 3 has a rotation axis;

[0034] The cross section of the second conductive member 3 in a plane perpendicular to the rotation axis is circular;

[0035] The plurality of contacts 4 are distributed equidistantly on the peripheral wall of the second conductive member 3 .

[0036] Specifically, this rotation axis is the centerline of rotation of the second conductive member 3, which determines the plane and direction of rotation of the second conductive member 3. The cross-section of the second conductive member 3 in a plane perpendicular to the rotation axis is circular. This means that if we cut it perpendicular to the rotation axis, the cross-section will be a circle. This design ensures the balance and stability of the second conductive member 3 during rotation. The circular cross-section can be solid or hollow. Finally, the multiple contacts 4 are evenly spaced around the circumference of the second conductive member 3. This even distribution not only ensures that each contact 4 has equal use opportunities, helping to even out wear and extend the life of the entire device, but also provides operational convenience and precision. Specifically, because the contacts 4 are evenly spaced, the second conductive member 3 only needs to rotate the same angle each time a contact 4 is switched. This means that the driver can achieve both circuit opening and closing by controlling a fixed rotation angle. For example, if there are eight evenly spaced contacts 4, a 45-degree rotation can switch from one contact 4 to the next. This design greatly simplifies the control logic and improves operational precision and reliability. In practical applications, the switching between power-off and conduction can be easily achieved by precisely controlling the rotation angle of the driver, making the entire overload protection process more precise and controllable.

[0037] Optionally, each of the contacts 4 protrudes from the peripheral wall surface of the second conductive member 3 at the same height.

[0038] The “same height” ensures the consistency of all contacts 4 when contacting the first conductive member 2. This means that no matter which position the second conductive member 3 rotates to, the currently working contact 4 can maintain the same contact pressure and contact area with the first conductive member 2.

[0039] The advantage of this design is that it not only ensures reliable and consistent electrical connections but also simplifies the design and manufacturing process of the device. By ensuring that each contact 4 has the same protruding height, the contact pressure is evenly distributed, reducing the risk of localized overheating and uneven wear, thereby extending the service life of the entire device. Furthermore, this design improves product consistency and reliability, reducing the complexity of production and quality control. In actual operation, it ensures stable and consistent electrical performance every time the contacts 4 are switched, providing a key guarantee for the long-term stable operation of the device.

[0040] Optionally, the surface of each of the contacts 4 is a convex arc surface. This shape can be understood as a portion of the surface of a small sphere. During the contact and separation process of the contacts 4, the sliding of the convex arc surface can play a certain self-cleaning role, helping to remove oxides or other impurities that may accumulate on the contact surface. Compared with planar contact, convex arc surface contact can make the stress more evenly distributed, reduce local high pressure points, and thus reduce the wear of the contacts 4. When disconnecting the circuit, the convex arc surface design helps to control the generation and extinction of the arc, which can reduce the damage of the arc to the surface of the contact 4.

[0041] Optionally, the first conductive part 2 includes a fixed part 21, a conductive part 22 and an elastic part 23, the fixed part 21 is fixedly mounted on the shell 1, the conductive part 22 is slidably provided on the fixed part 21, the conductive part 22 has a contact surface 221a for contacting the contact 4, the elastic part 23 is provided between the fixed part 21 and the conductive part 22, and the elastic part 23 is used to apply an elastic force to the conductive part 22 so that the contact surface 221a elastically abuts against the contact 4.

[0042] The fixing portion 21 can be a solid metal block directly fixed to the housing 1. The conductive portion 22 can be designed as a metal sheet that can slide on the fixing portion 21, and its surface has been specially treated to improve conductivity and wear resistance. The elastic portion 23 can be one or more compression springs, or other elastic structures, such as an elastic metal sheet.

[0043] The fixed portion 21 provides a stable foundation, while the combination of the slidable conductive portion 22 and the elastic portion 23 imparts system adaptability and reliable contact force. This structure effectively addresses various potential errors and variations, such as manufacturing errors, thermal expansion, and vibration, while maintaining good electrical contact. Furthermore, the elastic abutment design helps reduce wear on the contacts 4, extending the lifespan of the entire device. Furthermore, this structure facilitates maintenance and replacement: if necessary, the conductive portion 22 or the elastic portion 23 can be replaced without replacing the entire first conductive member 2.

[0044] Optionally, the fixing portion 21 is provided with a mounting groove 212, and two opposite side walls of the mounting groove 212 are respectively provided with a sliding groove 213, and the sliding groove 213 extends in the depth direction of the mounting groove 212;

[0045] The conductive portion 22 includes a body 221 and a sliding portion 222. The contact surface 221a is formed on the body 221. The sliding portion 222 is connected to the side of the body 221 facing away from the contact surface 221a. The sliding portion 222 extends into the mounting groove 212. Sliding protrusions 223 are provided on both sides of the sliding portion 222. The two sliding protrusions 223 correspond to the two sliding grooves 213 one-to-one. The sliding protrusions 223 can be slidably inserted into the corresponding sliding grooves 213.

[0046] One end of the elastic portion 23 is connected to the bottom wall of the mounting groove 212 , and the other end is connected to the sliding portion 222 .

[0047] Specifically, through the cooperation between the sliding groove 213 and the sliding protrusion 223, the movement of the conductive portion 22 is precisely limited to a predetermined direction, effectively avoiding the risk of tilting or getting stuck. At the same time, this design also facilitates adjustment and maintenance. For example, the contact pressure can be changed by adjusting the preload of the elastic portion 23.

[0048] Optionally, the sliding portion 222 is rod-shaped, and the elastic portion 23 is a spring. A portion of the spring is sleeved onto the sliding portion 222, with the end of the spring distal from the bottom wall of the mounting slot 212 abutting against the sliding protrusion 223. Specifically, the elastic portion 23 is designed as a spring, a common and effective elastic element. This sleeve arrangement not only saves space but also ensures that the spring remains well-positioned during compression and release, avoiding the risk of spring deflection or detachment.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A self-resetting current overload protection device, characterized in that: include: Housing (1); A first conductive member (2) is fixedly mounted on the housing (1); A second conductive member (3) is rotatably provided on the housing (1) and is located on one side of the first conductive member (2); a plurality of contacts (4) are protruding from a peripheral wall of the second conductive member (3); the plurality of contacts (4) are spaced apart in a circumferential direction of the first conductive member (2); and the second conductive member (3) is rotated so that the plurality of contacts (4) can sequentially contact or separate with the first conductive member (2); A driving member is in transmission connection with the second conductive member (3) to drive the second conductive member (3) to rotate.

2. The self-resetting current overload protection device according to claim 1, characterized in that: The second conductive member (3) has a rotation axis; The cross section of the second conductive member (3) in a plane perpendicular to the rotation axis is circular; The plurality of contacts (4) are distributed at equal intervals on the peripheral wall of the second conductive member (3).

3. The self-resetting current overload protection device according to claim 2, characterized in that: The height of each contact (4) protruding from the peripheral wall surface of the second conductive member (3) is the same.

4. The self-resetting current overload protection device according to claim 2, characterized in that: The surface of each contact (4) is a convex arc surface.

5. The self-resetting current overload protection device according to claim 1, characterized in that: The first conductive member (2) comprises a fixed portion (21), a conductive portion (22) and an elastic portion (23); the fixed portion (21) is fixedly mounted on the housing (1); the conductive portion (22) is slidably arranged on the fixed portion (21); the conductive portion (22) has a contact surface (221a) for contacting the contact (4); the elastic portion (23) is arranged between the fixed portion (21) and the conductive portion (22); the elastic portion (23) is used to apply an elastic force to the conductive portion (22) so that the contact surface (221a) elastically abuts against the contact (4).

6. The self-resetting current overload protection device according to claim 5, characterized in that: The fixing portion (21) is provided with a mounting groove (212), and two opposite groove side walls of the mounting groove (212) are respectively provided with sliding grooves (213), and the sliding grooves (213) extend in the depth direction of the mounting groove (212); The conductive portion (22) includes a body (221) and a sliding portion (222), the contact surface (221a) is formed on the body (221), the sliding portion (222) is connected to the side of the body (221) facing away from the contact surface (221a), the sliding portion (222) extends into the mounting groove (212), and sliding protrusions (223) are provided on both sides of the sliding portion (222), the two sliding protrusions (223) correspond to the two sliding grooves (213) one by one, and the sliding protrusions (223) can be slidably inserted into the corresponding sliding grooves (213); One end of the elastic portion (23) is connected to the bottom wall of the installation groove (212), and the other end is connected to the sliding portion (222).

7. The self-resetting current overload protection device according to claim 6, characterized in that: The sliding portion (222) is arranged in a rod shape, the elastic portion (23) is a spring, a part of the spring structure is sleeved on the sliding portion (222), and one end of the spring away from the bottom wall of the installation groove (212) is in contact with the sliding protrusion (223).

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