Thermal tripping structure and circuit breaker

Abstract

The utility model discloses a thermal tripping structure, which comprises a tripping bimetallic strip capable of being bent by heating, a draw bar and a heating element, the tripping bimetallic strip is connected with the heating element, and the draw bar is rotatably arranged on one side of the tripping bimetallic strip; the temperature compensation bimetallic strip can be heated to bend; the temperature compensation bimetallic strip is arranged on the traction rod and corresponds to the tripping bimetallic strip in position; when the heating element emits heat, the tripping bimetallic strip is heated to bend towards the temperature compensation bimetallic strip to touch the temperature compensation bimetallic strip and push the traction rod to rotate. The thermal tripping structure and the circuit breaker are scientific and reasonable in structure, when the environment temperature is high, the tripping bimetallic strip is deformed and bent by a certain angle, and meanwhile, the temperature compensation bimetallic strip is bent by the same angle towards the same direction to compensate the bending of the tripping bimetallic strip, so that the thermal tripping characteristic of the circuit breaker is not influenced by the environment temperature.

Description

TECHNICAL FIELD

[0001] The utility model relates to low voltage electrical apparatus technical field, concretely relates to a thermal trip structure and circuit breaker. BACKGROUND

[0002] Circuit breaker refers to the switch device that can be connected, carried and disconnected under the current of normal circuit condition and can be connected, carried and disconnected under the current of abnormal circuit condition within the specified time. The traditional thermal magnetic circuit breaker has overload and short circuit protection function and can protect the line and power supply equipment from being damaged. The overload protection function of the thermal magnetic circuit breaker is realized by the bimetallic strip. When the circuit is overloaded, the bimetallic strip is heated and bent forward to push the traction rod of the circuit breaker to unlock the operating mechanism and disconnect the circuit. Because the bimetallic strip will be bent and deformed due to temperature change, if the environmental temperature changes greatly, the thermal magnetic circuit breaker will malfunction and cannot accurately realize the overload protection under temperature change. SUMMARY

[0003] To solve the above problems, the purpose of the utility model is to provide a thermal trip structure and circuit breaker which can make the thermal trip characteristics of the circuit breaker not affected by the environmental temperature.

[0004] The purpose of the utility model is realized by the following technical scheme:

[0005] A thermal trip structure, comprising a trip bimetallic strip capable of being bent by heat, a traction rod and a heating element, the trip bimetallic strip is connected with the heating element, and the traction rod is rotationally arranged on one side of the trip bimetallic strip; further comprising a temperature compensation bimetallic strip capable of being bent by heat, the temperature compensation bimetallic strip is installed on the traction rod and corresponds to the position of the trip bimetallic strip; when the heating element is heated, the trip bimetallic strip is heated and bent towards the temperature compensation bimetallic strip, touches the temperature compensation bimetallic strip and pushes the traction rod to rotate.

[0006] A flange is arranged at the lower end of the traction rod, and an avoiding slot for avoiding the bending of the temperature compensation bimetallic strip is arranged at the upper end; the long strip-shaped plate is in a stepped shape, the lower end is fixed on the flange, and the upper end is in a cantilever structure and located in the avoiding slot.

[0007] An adjusting screw pointing to the temperature compensation bimetallic strip is installed on the trip bimetallic strip; when the heating element is heated, the adjusting screw can touch the temperature compensation bimetallic strip and push the traction rod to rotate under the driving of the trip bimetallic strip.

[0008] The utility model also provides a circuit breaker, which comprises a circuit breaker shell and a trip mechanism for disconnecting a circuit and is installed in the circuit breaker shell, and the thermal trip structure is arranged on the circuit breaker shell, the traction rod is rotationally installed in the circuit breaker shell and is connected with the trip mechanism, and the traction rod can rotate and push the trip mechanism to trip and unlock under the driving of the trip bimetallic strip to disconnect the circuit.

[0009] Two groups of thermal tripping structures are arranged side by side in the circuit breaker shell.

[0010] The utility model discloses scientific and reasonable structure, when environmental temperature is high, and the deformation of the thermal tripping structure will occur, and the certain angle of bending, and the temperature compensation bimetallic strip will also bend the same angle to the same direction, and the bending of the thermal tripping structure is compensated, and the thermal tripping characteristic of circuit breaker is not influenced by environmental temperature. BRIEF DESCRIPTION OF DRAWINGS

[0011] The structure of the utility model will be further explained in detail below in combination with the drawings.

[0012] Figure 1 It is the structural diagram of circuit breaker of the utility model.

[0013] Figure 2 It is the structural diagram of thermal tripping structure of the utility model.

[0014] Figure 3 It is the schematic diagram of temperature compensation bimetallic strip installation on the traction rod of the utility model.

[0015] Figure 4 It is the structural diagram of traction rod of the utility model.

[0016] As shown in the figure: 1-thermal tripping structure, 2-circuit breaker shell, 3-temperature compensation bimetallic strip, 4-traction rod, 41-flange, 42-avoiding groove, 5-tripping mechanism, 6-heating element, 7-adjusting screw, 8-mounting bracket. DETAILED DESCRIPTION

[0017] The implementation of the utility model will be explained by specific embodiments below, and the person skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in the specification. The described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0018] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, the term "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium.For the ordinary skill in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.It needs to explain that the term "include", "contain" or any other variant is intended to cover non-exclusive inclusion, so that the process, method, article or equipment containing a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes the elements inherent in such process, method, article or equipment. Embodiment 1

[0019] As Figures 1-3 shown, the embodiment provides a circuit breaker, which is a thermal magnetic circuit breaker, in addition to including the conventional components of the circuit breaker, the circuit breaker housing 2 and the trip mechanism 5 installed in the circuit breaker housing 2 for breaking the circuit, it also includes two sets of thermal trip structures installed side by side in the circuit breaker housing 2, each set of thermal trip structure includes a trip bimetallic strip 1, a temperature compensation bimetallic strip 3, a traction rod 4, a heating element 6 and an adjusting screw 7.The trip bimetallic strip 1 and the temperature compensation bimetallic strip 3 are both plate bodies composed of two layers of metal materials, iron sheet layer and copper sheet layer, and will bend towards the side of the iron sheet layer when heated.The iron sheet layer of the trip bimetallic strip 1 and the temperature compensation bimetallic strip 3 are both towards the side of the traction rod 4, that is, they will all bend towards the same side (the side of the traction rod 4) after being heated.

[0020] The trip bimetallic strip 1 is vertically arranged, and the lower end of the trip bimetallic strip 1 is fixedly installed in the circuit breaker housing 2.

[0021] The traction rod 4 is transversely arranged and rotatably installed between the trip mechanism 5 and the trip bimetallic strip 1, and the traction rod 4 is also linked with the trip mechanism 5, and can push the trip mechanism 5 to operate the operating mechanism of the circuit breaker to break the circuit by counterclockwise rotation.

[0022] The heating element 6 is a metal heat-conducting plate fixed in the circuit breaker housing 2, one end of the heating element 6 is connected with the lower end of the trip bimetallic strip 1 as a whole, and the other end is connected with a wire or a metal conducting sheet and is fixed and pressed in the circuit breaker housing 2.To improve the heat conduction speed, the heating element 6 and the trip bimetallic strip 1 are fixed as a whole in the connection mode of wide panel to wide panel, that is, the lower end of the trip bimetallic strip 1 and the end of the heating element 6 are both wide panel structures, parallel to each other and attached together.

[0023] The temperature compensation bimetallic strip 3 is a ladder-shaped long strip plate, the lower end 31 of the temperature compensation bimetallic strip 3 is fixed on the traction rod 4, and the upper end 32 of the temperature compensation bimetallic strip 3 is a cantilever structure and corresponds to the position of the upper end of the tripping bimetallic strip 1.

[0024] The adjusting screw 7 is screwed in the preset screw hole at the upper end of the tripping bimetallic strip 1, and the rod part of the adjusting screw 7 penetrates the upper end of the tripping bimetallic strip 1 and points to the upper end 32 of the temperature compensation bimetallic strip 3. When the tripping bimetallic strip 1 is bent due to heat, the adjusting screw 7 can move with the tripping bimetallic strip 1 towards the temperature compensation bimetallic strip 3, and the rod part of the adjusting screw 7 can push the temperature compensation bimetallic strip 3 to rotate with the traction rod 4.

[0025] Working principle:

[0026] When the ambient temperature is high, the tripping bimetallic strip 1 will deform and bend at a certain angle. At the same time, the cantilever structure 32 at the upper end of the temperature compensation bimetallic strip 3 will also bend at the same angle in the same direction, compensating for the bending of the tripping bimetallic strip 1, so that the traction rod 4 will not be pushed by the tripping bimetallic strip 1, avoiding the occurrence of false tripping, and making the thermal tripping characteristics of the circuit breaker not affected by the ambient temperature.

[0027] When the circuit breaker is overloaded, the temperature of the heating element 6 rises, and the temperature of the tripping bimetallic strip 1 fixed therewith also rises. After the tripping bimetallic strip 1 is heated, it bends towards the traction rod 4. When the adjusting screw 7 hits the upper end 32 of the temperature compensation bimetallic strip 3, it pushes the temperature compensation bimetallic strip 3 to rotate towards the tripping mechanism 5 and synchronously drives the traction rod 4 to rotate counterclockwise (towards the tripping mechanism 5), so that the tripping mechanism 5 trips and unlocks the operating mechanism of the circuit breaker, and the circuit breaker trips to break the overload current. Embodiment 2

[0028] In order to further optimize the structure, the following settings are added based on embodiment 1.

[0029] As shown in Figure 4 The lower end of the traction rod 4 is provided with a flange 41, and the upper end is provided with an avoiding slot 42 for avoiding the bending of the temperature compensation bimetallic strip 3; the lower end 31 of the temperature compensation bimetallic strip 3 is fixed on the flange 41 by riveting, welding or embedding, and the upper end of the temperature compensation bimetallic strip 3 is located in the avoiding slot 42. Embodiment 3

[0030] The difference between this embodiment and embodiment 1 or 2 is that.

[0031] The thermal tripping structure further comprises a mounting bracket 8, the mounting bracket 8 is fixedly installed in the circuit breaker housing 2; and the lower end of the tripping bimetallic strip 1 is fixed on the mounting bracket 8.

[0032] The other parts not described in detail of the utility model are the conventional technology known by the person skilled in the art.

[0033] It should be noted that the terms "comprising", "containing" or any other variant is intended to cover non-exclusive inclusion, so that the process, method, article or equipment containing a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0034] The protection scope of the utility model is not limited to the technical solutions disclosed in the specific embodiments, and any modification, equivalent replacement, improvement, etc. of the above embodiments according to the technical essence of the utility model falls within the protection scope of the utility model.

Claims

1. A heat-release structure, comprising a heat-bendable bimetallic strip (1), a traction rod (4), and a heating element (6), wherein the bimetallic strip (1) is connected to the heating element (6), and the traction rod (4) is rotatably disposed on one side of the bimetallic strip (1); characterized in that: The heat compensation bimetallic strip (3) is installed on the traction rod (4) and corresponds to the position of the tripping bimetallic strip (1); when the heating element (6) generates heat, the tripping bimetallic strip (1) is heated to bend towards the heat compensation bimetallic strip (3) and push the traction rod (4) to rotate.

2. The thermal trip structure of claim 1, wherein: The heating element (6) is integrally connected with the lower end of the tripping bimetallic strip (1); the upper end of the tripping bimetallic strip (1) corresponds to the position of the upper end of the heat compensation bimetallic strip (3).

3. The thermal trip structure of claim 1, wherein: The lower end of the traction rod (4) is provided with a flange (41), and the upper end is provided with an avoiding groove (42) for avoiding the bending of the heat compensation bimetallic strip (3); the heat compensation bimetallic strip (3) is a stepped long strip plate, the lower end of which is fixed on the flange (41), and the upper end is a cantilever structure and located in the avoiding groove (42).

4. The thermal trip structure of claim 3, wherein: The lower end of the heat compensation bimetallic strip (3) is fixed on the flange (41) by riveting, welding or embedding.

5. The thermal trip structure of claim 1, wherein: The tripping bimetallic strip (1) and the heat compensation bimetallic strip (3) are both plate bodies composed of two layers of different materials, which will bend when heated.

6. The thermal trip structure of claim 5, wherein: The tripping bimetallic strip (1) and the heat compensation bimetallic strip (3) are both plate bodies composed of iron sheet layer and copper sheet layer, which will bend towards the iron sheet layer side when heated, and the iron sheet layers of the tripping bimetallic strip (1) and the heat compensation bimetallic strip (3) are both towards the side where the traction rod (4) is located.

7. The thermal trip structure of claim 1, wherein: The tripping bimetallic strip (1) is provided with an adjusting screw (7) pointing to the heat compensation bimetallic strip (3); when the heating element (6) generates heat, the adjusting screw (7) can touch the heat compensation bimetallic strip (3) and push the traction rod (4) to rotate under the driving of the tripping bimetallic strip (1).

8. A circuit breaker comprising a circuit breaker housing (2) and a trip mechanism (5) mounted in the circuit breaker housing (2) for interrupting an electric circuit, characterized in that: The circuit breaker housing (2) is further provided with the thermal tripping structure according to any one of claims 1-7, the traction rod (4) is rotatably installed in the circuit breaker housing (2) and connected with the tripping mechanism (5), the traction rod (4) can rotate and push the tripping mechanism (5) to trip and unlock under the driving of the tripping bimetallic strip (1), and the circuit is broken.

9. The circuit breaker of claim 8, wherein: Two groups of thermal tripping structures are installed side by side in the circuit breaker housing (2).

10. The circuit breaker of claim 8, wherein: The thermal tripping structure further comprises a mounting bracket (8), the mounting bracket (8) is fixedly installed in the circuit breaker housing (2); and the lower end of the tripping bimetallic strip (1) is fixed on the mounting bracket (8).

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