An overload switch

Abstract

The utility model discloses an overload switch, including the base and upper cover of buckle connection, movable contact piece, bimetallic strip, binding post, connecting piece, button, movable contact piece and bimetallic strip are located in the base, movable contact piece one end is equipped with the installation portion of fixed in the base, and the other end is equipped with movable contact point, button bottom is equipped with the push rod, and the push rod bottom is equipped with the positioning hole, and the positioning hole is inlayed and is equipped with the spring, movable contact piece top is equipped with the positioning boss, and the spring bottom end is sleeved in the positioning boss outside, and movable contact piece top abuts at the spring bottom end, bimetallic strip's first end is fixed in the base, and second end is equipped with static contact point, the utility model can effectively limit the fixing of spring, avoid the risk that spring produces and fall off, guarantee movable contact piece stress even, and prevent arc disturbance through arc baffle, prevent metal splashing, fusion welding and short circuit, reduce fire hazard greatly, guarantee equipment safe operation.

Description

Technical Field

[0001] This utility model relates to the field of overload switch technology, and specifically to an overload switch. Background Technology

[0002] An overload switch, as a circuit protection device, typically breaks the circuit by causing the contacts to separate due to the thermal deformation of a bimetallic strip. A traditional overload switch generally includes components such as a base, top cover, moving contact, bimetallic strip, terminals, and a push button. The moving contact is linked to the push button lever by a spring, and one end of the bimetallic strip is connected to the stationary contact, while the other end is connected to the circuit via a connecting piece.

[0003] For example, Chinese Patent Publication No. CN223181000U discloses an overload protection switch, belonging to the field of switch technology. The overload protection switch includes: a housing; a ratchet button assembly disposed in the housing; an elastic contact piece, one end of which is mounted on the housing, and the other end of which has a contact portion abutting against the ratchet button assembly; a bimetallic strip, the first end of which is mounted on the housing, and the second end of which has a stationary contact detachably connected to the contact portion; and a reset linkage member rotatably disposed in the housing, the reset linkage member having a connecting arm and a reset arm, the connecting arm for connecting the contact portion, and the reset arm for connecting the second end of the bimetallic strip. The overload protection switch provided in this application has reliable overload protection performance and a stable and reliable overload protection switch function.

[0004] However, existing overload switch designs, such as those described above, have the following key drawbacks:

[0005] 1. Spring positioning structure missing:

[0006] The spring at the bottom of the push button lever directly abuts against the surface of the moving contact, lacking an effective limiting mechanism between them. Long-term operation or vibration can easily cause the spring to shift radially or even fall off, resulting in uneven force on the moving contact, affecting the accuracy of contact separation / closure, and reducing the reliability of the switch.

[0007] 2. Insufficient arc isolation:

[0008] There is no physical isolation barrier between the stationary contact and the adjacent metal connecting piece. When the contact interrupts a large current, the generated high-temperature arc may directly propagate to surrounding conductive components, causing metal spatter, component welding, or insulation failure, posing a short circuit and fire hazard.

[0009] Therefore, there is an urgent need for an overload switch structure that can simultaneously solve the problems of spring positioning stability and arc isolation. Utility Model Content

[0010] The present invention provides an overload switch to solve the problems mentioned in the background art.

[0011] To achieve the above objectives, this utility model provides the following technical solution:

[0012] An overload switch includes a base and a top cover that are snapped together, a moving contact, a bimetallic strip, a terminal block, a connecting piece, and a button, wherein the moving contact and the bimetallic strip are disposed within the base;

[0013] One end of the movable contact piece is provided with a mounting part fixed in the base, and the other end is provided with a movable contact.

[0014] The button has a push rod at its bottom, and a positioning hole is provided at the bottom of the push rod, with a spring embedded in the positioning hole;

[0015] The movable contact piece is provided with a positioning boss at the top, the bottom end of the spring is sleeved on the outside of the positioning boss, and the top of the movable contact piece abuts against the bottom end of the spring;

[0016] The first end of the bimetallic strip is fixed inside the base, and the second end is provided with a stationary contact; one side of the first end of the bimetallic strip is connected to the connecting piece.

[0017] The base has an arc-blocking plate on its inner bottom surface, and the arc-blocking plate is spaced between the stationary contact and the connecting piece.

[0018] Preferably, the mounting portion extends with connecting pins that extend beyond the base.

[0019] Preferably, the end of the connecting piece away from the bimetallic strip is connected to the terminal block.

[0020] Beneficial effects

[0021] The overload switch provided in this embodiment of the utility model has at least one of the following technical effects:

[0022] 1. Improved Spring Positioning Reliability: By setting a positioning boss on the top of the moving contact, the bottom end of the spring is precisely fitted onto its exterior, forming a radial constraint. This structure effectively limits the radial displacement of the spring during operation, avoids the risk of detachment, ensures uniform force on the moving contact, and significantly improves the consistency of contact separation / closure and the switch life.

[0023] 2. Enhanced Arc Isolation Capability: An arc-damping plate is added to the inner bottom surface of the base, vertically spaced between the stationary contact and the connecting piece. When the contact breaks and an arc is generated, the arc-damping plate physically blocks the arc from spreading to the connecting piece, preventing metal splashing, welding, and short circuits, significantly reducing fire hazards and ensuring safe operation of the equipment.

[0024] 3. High structural integration: The positioning boss and moving contact piece are integrally molded, and the arc-blocking plate and base are integrated. No additional assembly parts are required. While improving functionality, the structure remains simple and production costs are reduced. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0027] Figure 3 This is a schematic diagram of the connection structure between the moving contact, spring, and push rod of this utility model.

[0028] The correspondence between the labels and component names in the attached figures is as follows:

[0029] 1. Base; 2. Moving contact; 21. Mounting part; 211. Connecting pin; 22. Moving contact; 23. Positioning boss; 3. Bimetallic strip; 31. Stationary contact; 4. Terminal block; 5. Connecting piece; 6. Button; 61. Push rod; 611. Positioning hole; 7. Spring; 8. Arc damper. Detailed Implementation

[0030] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] To avoid excessive and unnecessary details, well-known structures or functions will not be described in detail in the following embodiments.

[0034] like Figure 1-3 The diagram shown is a structural schematic of an overload switch according to a preferred embodiment of the present invention.

[0035] In this embodiment, the device includes a base 1 and a top cover that are fastened together. The base 1 internally houses: a movable contact piece 2, a bimetallic strip 3, a terminal block 4, a connecting piece 5, and a button 6. The movable contact piece 2 and the bimetallic strip 3 are disposed within the base 1. One end of the movable contact piece 2 has a mounting portion 21 fixed within the base 1, and the other end extends into a cantilever and has a movable contact point 22. The button 6 has a push rod 61 at its bottom, and a positioning hole 611 is formed at the bottom of the push rod 61, with a spring 7 embedded within the positioning hole 611. The top of the movable contact piece 2 is punched... The press-formed part has a positioning boss 23. The bottom end of the spring 7 is tightly fitted onto the outer circumference of the positioning boss 23, and the top of the moving contact piece 2 abuts against the bottom end of the spring 7. The first end of the bimetallic strip 3 is fixed inside the base 1, and the second end extends out to provide a stationary contact point 31. One side of the first end of the bimetallic strip 3 is connected to the connecting piece 5. An arc-blocking plate 8 is integrally injection-molded on the inner bottom surface of the base 1. The arc-blocking plate 8 is spaced apart and vertically arranged between the stationary contact point 31 and the connecting piece 5 to form a physical barrier. Figure 2 (As shown).

[0036] In this embodiment, the mounting part 21 extends with a connection pin 211, which extends out of the base 1 and forms the external circuit interface of the moving contact 2.

[0037] In this embodiment, the end of the connecting piece 5 away from the bimetallic strip 3 is connected to the terminal 4 to realize the electrical connection between the bimetallic strip 3 and the external wire.

[0038] The overload switch of this utility model can be installed, connected or set in a common mechanical way, and can be implemented as long as it can achieve its beneficial effect.

[0039] All technologies not described in detail in this utility model are known technologies. Those skilled in the art can easily implement this utility model based on their understanding of this specification, and the contents shown in the accompanying drawings are part of this specification.

[0040] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. An overload switch, comprising a base (1) and a top cover that are snapped together, a moving contact (2), a bimetallic strip (3), a terminal block (4), a connecting piece (5), and a button (6), characterized in that: The movable contact piece (2) and the bimetallic piece (3) are disposed inside the base (1); The movable contact piece (2) has a mounting part (21) fixed in the base (1) at one end and a movable contact (22) at the other end; The button (6) has a push rod (61) at the bottom, and a positioning hole (611) is opened at the bottom of the push rod (61), and a spring (7) is embedded in the positioning hole (611); The movable contact piece (2) has a positioning boss (23) on its top, the bottom end of the spring (7) is sleeved on the outside of the positioning boss (23), and the top of the movable contact piece (2) abuts against the bottom end of the spring (7); The first end of the bimetallic strip (3) is fixed inside the base (1), and the second end is provided with a stationary contact (31); one side of the first end of the bimetallic strip (3) is connected to the connecting piece (5); The base (1) has an arc-blocking plate (8) on its inner bottom surface, and the arc-blocking plate (8) is spaced between the stationary contact (31) and the connecting piece (5).

2. The overload switch according to claim 1, characterized in that: The mounting part (21) extends with a connection pin (211) that extends outside the base (1).

3. The overload switch according to claim 1, characterized in that: The end of the connecting piece (5) away from the bimetallic strip (3) is connected to the terminal block (4).

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