阅读说明：本技术 纯温度型热保护器 (Pure temperature type thermal protector ) 是由 汪文瀚 汪兆龙 李健伟 卞开友 汪兆年 黄晓飞 于 2020-04-13 设计创作，主要内容包括：本发明提供了一种纯温度型热保护器,包括外壳、一端设置有动触点的弹簧片和固定于外壳底部的底板,所述外壳与所述底板之间设置有第一绝缘层；所述弹簧片固定于所述外壳内,所述底板上设置有与所述动触点配合的静触点；所述底板与所述弹簧片之间固定有双金属片；所述外壳内设置有第二绝缘层,所述第二绝缘层用于在动触点和静触点断开的状态下防止双金属片连通动触点和静触点的电路。本发明提供的超薄自持型热保护器整体厚度较小。(The invention provides a pure temperature type thermal protector which comprises a shell, a spring piece and a bottom plate, wherein one end of the spring piece is provided with a movable contact, the bottom plate is fixed at the bottom of the shell, and a first insulating layer is arranged between the shell and the bottom plate; the spring piece is fixed in the shell, and the bottom plate is provided with a fixed contact matched with the movable contact; a bimetallic strip is fixed between the bottom plate and the spring piece; and a second insulating layer is arranged in the shell and is used for preventing the bimetallic strip from communicating the circuits of the movable contact and the fixed contact when the movable contact and the fixed contact are disconnected. The ultrathin self-supporting thermal protector provided by the invention is smaller in overall thickness.)

1. A pure temperature type thermal protector is characterized by comprising a shell (5), a spring piece (2) with one end provided with a movable contact (1) and a bottom plate (7) fixed at the bottom of the shell, wherein a first insulating layer is arranged between the shell and the bottom plate;

the spring piece is fixed in the shell, and a fixed contact (8) matched with the movable contact is arranged on the bottom plate;

a bimetallic strip (4) is fixed between the bottom plate and the spring piece;

and a second insulating layer is arranged in the shell and is used for preventing the bimetallic strip from communicating the circuits of the movable contact and the fixed contact when the movable contact and the fixed contact are disconnected.

2. A protector according to claim 1, wherein the second insulating layer is disposed between the bimetal and the spring plate;

preferably, the first insulating layer is an insulating paper (6), and the second insulating layer is an insulating film (3).

3. A pure temperature type thermal protector according to claim 1, characterized in that the bottom plate is provided with a positioning groove (7-1), the bimetal and the second insulating layer are arranged in the positioning groove, a protrusion (2-1) is arranged on the spring plate corresponding to the bimetal, and the protrusion is arranged on one side of the spring plate close to the bimetal;

preferably, the bimetallic strip is arc-shaped, and the opening of the arc is towards the outer shell;

a space is reserved between the edge of the bimetallic strip and the positioning groove;

the protruding portion is in contact with the second insulating layer;

the protruding part abuts against the bimetallic strip or has a distance with the bimetallic strip.

4. A pure temperature type thermal protector according to claim 1, wherein a boss (7-3) is provided on the bottom plate, a positioning column (7-2) is provided on the boss, and the bimetallic strip is fixed on the positioning column;

a bulge (2-1) is arranged on the spring piece corresponding to the position of the bimetallic strip, and the bulge is positioned on one side of the spring piece close to the bimetallic strip;

preferably, the protruding portion is in contact with the second insulating layer;

the protruding part abuts against the bimetallic strip or has a distance with the bimetallic strip.

5. A pure temperature type thermal protector according to claim 3 or 4, characterized in that the top of the outer shell is provided with a welding boss (5-1), and the end of the bimetallic strip not provided with the moving contact is welded with the welding boss.

6. A pure temperature type thermal protector is characterized by comprising a shell (5), a spring piece (2) with one end provided with a movable contact (1) and a bottom plate (7) fixed at the bottom of the shell, wherein a first insulating layer is arranged between the shell and the bottom plate;

the spring piece is fixed in the shell, and a fixed contact (8) matched with the movable contact is arranged on the shell;

a bimetallic strip (4) is fixed between the shell and the spring piece;

and a second insulating layer is arranged in the shell and is used for preventing the bimetallic strip from communicating the circuits of the movable contact and the fixed contact when the movable contact and the fixed contact are disconnected.

7. A protector according to claim 6, wherein the second insulating layer is provided between the bimetal and the spring plate;

preferably, the first insulating layer is an insulating paper (6), and the second insulating layer is an insulating film (3).

8. A protector according to claim 6, characterized in that the casing is provided with a positioning slot (7-1), the bimetal and the second insulating layer are arranged in the positioning slot, and the spring plate is provided with a protrusion (2-1) corresponding to the bimetal, the protrusion being located on one side of the spring plate close to the bimetal.

Preferably, the bimetallic strip is arc-shaped, and the opening of the arc is towards the bottom plate;

a space is reserved between the edge of the bimetallic strip and the positioning groove;

the protruding portion is in contact with the second insulating layer;

the protruding part abuts against the bimetallic strip or has a distance with the bimetallic strip.

9. A pure temperature type thermal protector according to claim 6, characterized in that the housing is provided with a boss (7-3) on which a positioning post (7-2) is provided, the bimetal being fixed on the positioning post;

and a bulge (2-1) is arranged on the spring piece corresponding to the position of the bimetallic strip, and is positioned on one side of the spring piece close to the bimetallic strip.

Preferably, the protruding portion is in contact with the second insulating layer;

the protruding part abuts against the bimetallic strip or has a distance with the bimetallic strip.

10. A pure temperature type thermal protector according to claim 8 or 9, wherein a welding boss (5-1) is provided on the base plate, and an end of the bimetal not provided with the moving contact is welded with the welding boss.

Technical Field

The invention relates to the technical field of thermal protectors, in particular to a pure temperature type thermal protector.

Background

The thermal protector is the electrical apparatus component commonly used, the security of circuit can be directly influenced to the good or bad of its performance, in the current thermal protector design, the electric current all is through the bimetallic strip, utilizes the bimetallic strip temperature change to produce the purpose that the characteristic of deformation reaches high temperature open circuit, this kind of thermal protector, the circular telegram electric current is big more, the increase that corresponds the electric current needs the thickness of the spring leaf of thermal protector big more, consequently, the inner space of thermal protector casing also corresponds the increase. It can be seen that the existing thermal protectors suffer from at least the following disadvantages:

1. for a large-current thermal protector, the required spring piece is large in thickness and high in cost, and the large-thickness spring piece acts relatively slowly when being heated and deformed, so that the sensitivity is relatively low;

2. for a large-current thermal protector, the required spring piece is large in thickness, and the whole thickness of the thermal protector is large.

Disclosure of Invention

The present invention aims to provide a pure temperature type thermal protector to solve at least one of the above technical problems.

One technical scheme of the application is as follows: a pure temperature type thermal protector comprises a shell, a spring piece with a movable contact at one end and a bottom plate fixed at the bottom of the shell, wherein a first insulating layer is arranged between the shell and the bottom plate; the spring piece is fixed in the shell, and the bottom plate is provided with a fixed contact matched with the movable contact; a bimetallic strip is fixed between the bottom plate and the spring piece; and a second insulating layer is arranged in the shell and is used for preventing the bimetallic strip from communicating the circuits of the movable contact and the fixed contact when the movable contact and the fixed contact are disconnected.

Preferably, the second insulating layer is disposed between the bimetal and the spring plate.

Preferably, the first insulating layer is an insulating paper, and the second insulating layer is an insulating film.

Preferably, a positioning groove is formed in the bottom plate, the bimetallic strip and the second insulating layer are arranged in the positioning groove, a protruding portion is arranged on the spring piece corresponding to the bimetallic strip, and the protruding portion is located on one side, close to the bimetallic strip, of the spring piece; preferably, the bimetallic strip is arc-shaped, and the opening of the arc is towards the outer shell; a space is reserved between the edge of the bimetallic strip and the positioning groove; the protruding portion is in contact with the second insulating layer; the protruding part abuts against the bimetallic strip or has a distance with the bimetallic strip.

Preferably, a boss is arranged on the bottom plate, a positioning column is arranged on the boss, and the bimetallic strip is fixed on the positioning column; the spring plate is provided with a protruding part corresponding to the position of the bimetallic strip, and the protruding part is positioned on one side of the spring plate close to the bimetallic strip.

Preferably, the protruding portion is in contact with the second insulating layer; the protruding part abuts against the bimetallic strip or has a distance with the bimetallic strip.

Preferably, a welding boss is arranged at the top of the shell, and one end of the bimetallic strip, which is not provided with the moving contact, is welded with the welding boss.

The pure temperature type thermal protector is characterized in that the pure temperature type thermal protector is arranged in the casing, the bimetallic strip is arranged in the casing, and the bimetallic strip is arranged in the casing. It can be seen that the existing thermal protector has at least the following advantages:

1. for a large-current thermal protector, the required spring piece is small in thickness and low in cost, and the small spring piece can act relatively quickly when being heated and deformed, so that the sensitivity is relatively high;

2. for a large-current thermal protector, the required spring piece thickness is small, and the overall thickness of the thermal protector is small.

Another technical scheme of the application is as follows: a pure temperature type thermal protector comprises a shell, a spring piece with a movable contact at one end and a bottom plate fixed at the bottom of the shell, wherein a first insulating layer is arranged between the shell and the bottom plate; the spring piece is fixed in the shell, and a fixed contact matched with the movable contact is arranged on the shell; a bimetallic strip is fixed between the shell and the spring piece; and a second insulating layer is arranged in the shell and is used for preventing the bimetallic strip from communicating the circuits of the movable contact and the fixed contact when the movable contact and the fixed contact are disconnected.

Preferably, the second insulating layer is disposed between the bimetal and the spring plate.

Preferably, the first insulating layer is an insulating paper, and the second insulating layer is an insulating film.

Preferably, the shell is provided with a positioning groove, the bimetallic strip and the second insulating layer are arranged in the positioning groove, a protruding part is arranged on the spring piece corresponding to the bimetallic strip, and the protruding part is located on one side, close to the bimetallic strip, of the spring piece.

Preferably, the bimetallic strip is arc-shaped, and the opening of the arc is towards the bottom plate; a space is reserved between the edge of the bimetallic strip and the positioning groove; the protruding portion is in contact with the second insulating layer; the protruding part abuts against the bimetallic strip or has a distance with the bimetallic strip.

Preferably, a boss is arranged on the shell, a positioning column is arranged on the boss, and the bimetallic strip is fixed on the positioning column; the spring plate is provided with a protruding part corresponding to the position of the bimetallic strip, and the protruding part is positioned on one side of the spring plate close to the bimetallic strip.

Preferably, the protruding portion is in contact with the second insulating layer; the protruding part abuts against the bimetallic strip or has a distance with the bimetallic strip.

Preferably, a welding boss is arranged on the bottom plate, and one end of the bimetallic strip, which is not provided with the moving contact, is welded with the welding boss.

The pure temperature type thermal protector is characterized in that the pure temperature type thermal protector is arranged in the casing, the bimetallic strip is arranged in the casing, and the bimetallic strip is arranged in the casing. It can be seen that the existing thermal protector has at least the following advantages:

1. for a large-current thermal protector, the required spring piece is small in thickness and low in cost, and the small spring piece can act relatively quickly when being heated and deformed, so that the sensitivity is relatively high;

2. for a large-current thermal protector, the required spring piece thickness is small, and the overall thickness of the thermal protector is small.

3. The boss is arranged on the bottom plate, the bimetallic strip is arranged on the shell, the fixing of the bimetallic strip and the welding of the spring piece cannot affect each other during production, the welding process of the spring piece can be carried out outside the shell, and the bimetallic strip is assembled with the shell fixed with the thermistor after the welding is finished.

Drawings

FIG. 1 is a schematic view showing the internal structure of a pure temperature type thermal protector according to example 1;

FIG. 2 is a schematic view showing the internal structure of the pure temperature type thermal protector of embodiment 2;

FIG. 3 is a schematic view showing the internal structure of the pure temperature type thermal protector of embodiment 3;

FIG. 4 is a schematic view showing the internal structure of the pure temperature type thermal protector of embodiment 4;

reference numbers in the figures: the device comprises a movable contact 1, a spring piece 2, a convex part 2-1, an insulating film 3, a bimetallic strip 4, a shell 5, a welding boss 5-1, insulating paper 6, a bottom plate 7, a positioning groove 7-1, a positioning column 7-2, a boss 7-3 and a fixed contact 8.

Detailed Description

The invention is further illustrated by the following figures and examples.