Temperature-adjustable thermal protector

Abstract

A shell is arranged on a bottom plate assembly, and a pressure plate, a double-piece movable contact assembly, an elastic connecting piece, a plurality of static contact assemblies, a temperature adjusting threaded rod, a threaded inner sleeve and a support are all arranged in an internal space formed by the shell and the bottom plate assembly. The static contact assembly is arranged on a bottom plate of the bottom plate assembly, the threaded inner sleeve is fixed to the center of the bottom plate of the bottom plate assembly, the pressing disc is located above the double-piece movable contact assembly, one end of the temperature adjusting threaded rod sequentially penetrates through the pressing disc and the double-piece movable contact assembly to be in threaded connection with the threaded inner sleeve, and the other end of the temperature adjusting threaded rod is in threaded connection with the temperature adjusting threaded rod. The pre-pressure adjusting device is used for adjusting downward pre-pressure applied to the double-piece movable contact assembly. According to the utility model, the threaded inner sleeve and the temperature adjusting threaded rod are added on the basis of the existing protector structure, and the downward pre-pressure applied to the bimetallic strip is adjusted by adjusting the screwing depth of the temperature adjusting threaded rod, so that the bimetallic strip reaches an ideal operating temperature point; and the action temperature difference of the same batch of protectors can be maintained within a certain temperature difference range, so that the temperature regulation process is greatly simplified, and the quality stability and the production efficiency of the protectors are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a temperature-adjustable thermal protector and belongs to the technical field of power electronics. BACKGROUND

[0002] The thermal protector is an important safety protection device, which is widely used in motors, transformers, electrical equipment and electrical equipment, and can prevent and limit abnormal conditions caused by overload, short circuit or failure by monitoring the working state of the equipment, so as to ensure the safe operation of the equipment. The working principle of the thermal protector is mainly based on the thermal effect of current and the deformation characteristics of the bimetallic strip.

[0003] However, the existing thermal protector has some defects in the actual production and application process. First, as a high-power thermal protector, when an arc is generated by a large current, it will cause impact and ablation to the spring structure inside the protector, which is easy to cause the protector to fail prematurely. Secondly, when the original structure of the thermal protector is calibrated, a certain pressure is applied downward through three pressure slots on the protector, which is then applied to the bimetallic strip to pre-press it to reach the ideal action temperature point. However, this temperature calibration method cannot ensure that the downward pressure on the three pressure slots is uniform, which is easy to cause uneven force on the thermal bimetallic strip, resulting in temperature dispersion (large temperature difference in the same batch), and this temperature adjustment method is complicated to operate, which is not conducive to mass production in the workshop. These problems limit the performance and reliability of the thermal protector, and further technical improvement and innovation are needed to solve them. SUMMARY

[0004] To solve the problems in the prior art, the utility model provides a temperature-adjustable thermal protector for realizing circuit protection.

[0005] The main technical scheme adopted in the utility model is as follows:

[0006] The adjustable temperature thermal protector comprises a shell, a pressure disc, a double-leaf movable contact assembly, an elastic connecting piece, a static contact assembly, an adjustable temperature threaded rod, a threaded inner sleeve, a bottom plate assembly and a support, wherein the shell is arranged on the bottom plate assembly, the pressure disc, the double-leaf movable contact assembly, the elastic connecting piece, a plurality of static contact assemblies, the adjustable temperature threaded rod, the threaded inner sleeve and the support are arranged in an internal space formed by the shell and the bottom plate assembly, the static contact assembly is arranged on a bottom plate of the bottom plate assembly, the threaded inner sleeve is fixed at a center position of the bottom plate of the bottom plate assembly, the pressure disc is located above the double-leaf movable contact assembly, one end of the adjustable temperature threaded rod is sequentially threaded through the pressure disc and the double-leaf movable contact assembly and is screwed with the threaded inner sleeve, so as to adjust a downward pre-pressing force applied to the double-leaf movable contact assembly, the elastic connecting piece is arranged between the threaded inner sleeve and the double-leaf movable contact assembly, movable contacts in the double-leaf movable contact assembly correspond to static contacts in the static contact assembly in a one-to-one manner, the support is welded on the bottom plate of the bottom plate assembly, and a top end of a supporting frame of the support is clamped with the double-leaf movable contact assembly.

[0007] Preferably, the double-leaf movable contact assembly comprises a bimetallic sheet, a heating sheet and a plurality of movable contacts, the plurality of movable contacts are uniformly arranged on a bottom surface of the heating sheet in a circumferential direction, the bimetallic sheet is arranged above the heating sheet and contacts a side of the heating sheet away from the movable contacts, threaded through holes are arranged at center positions of the bimetallic sheet and the heating sheet, and are used for being screwed with the adjustable temperature threaded rod.

[0008] Preferably, a threaded through hole is arranged at a center position of the pressure disc, and is used for being screwed with the adjustable temperature threaded rod.

[0009] Preferably, the static contact assembly comprises a plurality of connecting seats and a plurality of static contacts, the plurality of connecting seats are uniformly arranged on the bottom plate of the bottom plate assembly in a circumferential direction, and the plurality of static contacts are arranged on the connecting seats in a one-to-one manner.

[0010] Preferably, an insulating protective sleeve is further arranged at the center position of the bottom plate assembly, and the insulating protective sleeve surrounds the elastic connecting piece and the threaded inner sleeve.

[0011] Beneficial effects: the adjustable temperature thermal protector has the following advantages:

[0012] (1) In the utility model, the temperature calibration mode is changed, the threaded inner sleeve and the adjustable temperature threaded rod are added on the basis of the existing protector structure, the downward pre-pressing force applied to the bimetallic sheet is adjusted by adjusting the screwing depth of the adjustable temperature threaded rod, so that the ideal action temperature point is reached, the action temperature difference of the same batch of protectors can be maintained within a certain temperature difference range, the temperature adjustment process is greatly simplified, and the quality stability and production efficiency of the protector are improved.

[0013] The utility model discloses a protection sleeve is arranged outside the elastic connecting piece, solved the failure problem of protection ware use process because of the elastic connecting piece ablation, greatly prolonged the service life of protection ware BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the whole structure explosion schematic drawing of example 1;

[0015] Figure 2 It is the partial section schematic drawing of example 1;

[0016] In the drawing: shell 1, pressure disc 2, double piece dynamic contact point assembly 3, bimetallic strip 3-1, heating piece 3-2, dynamic contact 3-3, elastic connecting piece 4, static contact point assembly 5, connecting seat 5-1, static contact 5-2, temperature adjusting screw rod 6, threaded inner sleeve 7, bottom plate assembly 8, bottom plate 8-1, insulation protection sleeve 9, support 10, support frame 10-1. DETAILED DESCRIPTION

[0017] In order to make the personnel in the technical field better understand the technical scheme in the present application, the technical scheme in the example of the present application is described clearly and completely below, obviously, the described example is only a part of the present application, not all the examples. Based on the example in the present application, all other examples obtained by the person skilled in the art without creative labor should belong to the scope of the present application. Example 1

[0018] The adjustable temperature thermal protector comprises a shell 1, a pressing disc 2, a double-leaf movable contact assembly 3, an elastic connecting piece 4, a static contact assembly 5, an adjustable temperature threaded rod 6, a threaded inner sleeve 7, a bottom plate assembly 8 and a support 9, wherein the shell 1 is arranged on the bottom plate assembly 8, the pressing disc 2, the double-leaf movable contact assembly 3, the elastic connecting piece 4, the static contact assembly 5, the adjustable temperature threaded rod 6, the threaded inner sleeve 7 and the support 9 are arranged in the internal space formed by the shell 1 and the bottom plate assembly 8, the static contact assembly 5 is arranged on the bottom plate 8-1 of the bottom plate assembly 8, the threaded inner sleeve 7 is fixed at the center position of the bottom plate 8-1 of the bottom plate assembly 8, the pressing disc 2 is located above the double-leaf movable contact assembly 3, one end of the adjustable temperature threaded rod 6 is sequentially threaded through the pressing disc 2 and the double-leaf movable contact assembly 3 and is screwed with the threaded inner sleeve 7, for adjusting the downward pre-pressing force applied to the double-leaf movable contact assembly 3, the elastic connecting piece 4 is arranged between the threaded inner sleeve 7 and the double-leaf movable contact assembly 3, the movable contact 3-3 in the double-leaf movable contact assembly 3 corresponds to the static contact 5-2 in the static contact assembly 5 in a one-to-one manner, the support 10 is welded on the bottom plate 8-1 of the bottom plate assembly 8, and the top end of the supporting frame 10-1 of the support 10 is clamped with the double-leaf movable contact assembly 3. In the embodiment 1, the clamping mode of the support 10 and the double-leaf movable contact assembly 3 belongs to the prior art, and therefore is not described in detail.

[0019] In the embodiment 1, the double-leaf movable contact assembly 3 comprises a bimetallic sheet 3-1, a heating sheet 3-2 and a plurality of movable contacts 3-3, the plurality of movable contacts 3-3 are uniformly arranged on the bottom surface of the heating sheet 3-2 in a circumferential direction, the bimetallic sheet 3-1 is arranged above the heating sheet 3-2 and contacts the side of the heating sheet 3-2 away from the movable contacts 3-3, and threaded through holes are arranged at the center positions of the bimetallic sheet 3-1 and the heating sheet 3-2 for screwing with the adjustable temperature threaded rod 6.

[0020] In the embodiment 1, a threaded through hole is arranged at the center position of the pressing disc 2 for screwing with the adjustable temperature threaded rod 6.

[0021] In the embodiment 1, the static contact assembly 5 comprises a plurality of connecting seats 5-1 and a plurality of static contacts 5-2, the plurality of connecting seats 5-1 are uniformly arranged on the bottom plate 8-1 of the bottom plate assembly 8 in a circumferential direction, and the plurality of static contacts 5-2 are arranged on the connecting seats 5-1 in a one-to-one manner. In the embodiment 1, the connecting seat 5-1 comprises a convex column and a ceramic sheet, the convex column is sintered on the bottom plate 8-1 through glass powder and penetrates the bottom plate 8-1, the ceramic sheet is sleeved on the convex column respectively, and the static contact 5-2 is welded on the top end of the convex column. The structure is the prior art, and therefore is not described in detail. The existing connecting seat capable of realizing static contact installation can be used.

[0022] In the embodiment 1, in order to protect the elastic connecting piece 4 from the impact and ablation of the electric arc during the operation, an insulating protective sleeve 9 is arranged at the center position of the bottom plate assembly 8, and the elastic connecting piece 4 and the threaded inner sleeve 7 are both enclosed in the insulating protective sleeve 9. In the embodiment 1, the insulating protective sleeve 9 is preferably a ceramic protective sleeve, and the elastic connecting piece is preferably a spring.

[0023] In the embodiment 1, the number of the moving contact and the stationary contact is preferably three.

[0024] The temperature calibration mode of the utility model is as follows:

[0025] The center position of the pressure plate 2 and the double-piece moving contact assembly 3 is provided with a threaded through hole with the same size as the threaded inner sleeve 7, the temperature adjusting threaded rod 6 is connected with the threaded inner sleeve 7 at the center of the bottom plate 8-1 by passing through the pressure plate 2 and the double-piece moving contact assembly 3 in sequence, the downward pre-pressing force applied to the bimetallic strip 3-1 is adjusted by adjusting the tightening depth of the temperature adjusting threaded rod 6, so that the ideal action temperature point is reached.

[0026] The above is only the preferred embodiment of the utility model, and it should be pointed out that for the ordinary skilled in the art, without departing from the principle of the utility model, a number of improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection range of the utility model.

Claims

1. A temperature-adjustable thermal protector, characterized by comprising: The application relates to a contactor, which comprises a shell, a pressing disc, a double-leaf movable contact assembly, an elastic connecting piece, a static contact assembly, a temperature-adjusting threaded rod, a threaded inner sleeve, a bottom plate assembly and a support, wherein the shell is arranged on the bottom plate assembly, the pressing disc, the double-leaf movable contact assembly, the elastic connecting piece, a plurality of static contact assemblies, the temperature-adjusting threaded rod, the threaded inner sleeve and the support are arranged in an internal space formed by the shell and the bottom plate assembly, the static contact assembly is arranged on a bottom plate of the bottom plate assembly, the threaded inner sleeve is fixed at a central position of the bottom plate of the bottom plate assembly, the pressing disc is located above the double-leaf movable contact assembly, one end of the temperature-adjusting threaded rod is sequentially threaded through the pressing disc and the double-leaf movable contact assembly and is screwed with the threaded inner sleeve, so as to adjust a downward pre-pressing force applied to the double-leaf movable contact assembly, the elastic connecting piece is arranged between the threaded inner sleeve and the double-leaf movable contact assembly, the movable contacts in the double-leaf movable contact assembly correspond to the static contacts in the static contact assembly one by one, the support is welded on the bottom plate of the bottom plate assembly, and a top end of a supporting frame of the support is clamped with the double-leaf movable contact assembly.

2. The temperature-regulatable thermal protector according to claim 1, characterized in that, The double-leaf movable contact assembly comprises a bimetallic sheet, a heating sheet and a plurality of movable contacts, the movable contacts are uniformly arranged on a bottom surface of the heating sheet in a circumferential direction, the bimetallic sheet is arranged above the heating sheet and contacts a side of the heating sheet away from the movable contacts, threaded through holes are arranged at central positions of the bimetallic sheet and the heating sheet and are used for being screwed with the temperature-adjusting threaded rod.

3. The temperature-regulatable thermal protector according to claim 1, wherein A threaded through hole is arranged at a central position of the pressing disc and is used for being screwed with the temperature-adjusting threaded rod.

4. The temperature-regulatable thermal protector according to claim 1, wherein The static contact assembly comprises a plurality of connecting seats and a plurality of static contacts, the connecting seats are uniformly arranged on the bottom plate of the bottom plate assembly in a circumferential direction, and the static contacts are arranged on the connecting seats one by one.

5. A temperature-regulated thermal protector according to any one of claims 1-4, characterized in that, An insulating protective sleeve is further arranged at a central position of the bottom plate assembly and surrounds the elastic connecting piece and the threaded inner sleeve.

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