Thermal protector fast in disconnection and high in bearing capacity

Abstract

The utility model relates to a thermal protector which is fast in disconnection and strong in bearing capacity. The thermal protector is mainly used for over-temperature rise and over-current protection of a refrigeration compressor or other motors. The heating device comprises a pin, a cover plate, a movable contact spring, a bimetallic strip, a first static pin, a second static pin, a heating body, a third static pin and a base, the two ends of the heating body are welded to the first static pin and the second static pin respectively, one end of the movable contact spring is electrically connected with the first static pin, the other end of the movable contact spring is matched with the third static pin, the pin is electrically connected with the third static pin, and the bimetallic strip is arranged on the base. The heating device is structurally characterized in that a loading cavity used for installing the heating body is formed in the base, a limiting table used for placing the heating body is arranged at the bottom of the loading cavity, the heating body is a spiral heating body or a planar heating body, and when the heating body is the spiral heating body, the limiting table is of a plurality of semicircular protruding structures. When the heating body is a planar heating body, the limiting table is arranged to be of a structure with two strip-shaped protrusions.

Description

Technical Field

[0001] The utility model relates to a thermal protector with fast disconnection and strong load-bearing capacity, which is mainly used for over-temperature rise and over-current protection of refrigeration compressors or other motors. Background Art

[0002] At present, all refrigeration compressors are equipped with a thermal protector, which is mainly used for over-temperature rise and over-current protection of refrigeration compressors. The thermal protector in the prior art forms a protective circuit that is electrically connected in normal conditions and disconnected in abnormal conditions through the three components of the pin, the static pin (including contacts), the moving reed component (including contacts), and the heating wire component; the thermal protector is provided with a heating wire and a bimetallic strip. When the refrigerator compressor is blocked or the voltage is unstable, the current increases. When the heat generated by the heating wire reaches the set action temperature of the bimetallic strip, the thermal protector can be activated to disconnect the electrical circuit. When the thermal protector reaches the set recovery temperature, the bimetallic strip can be reset and the electrical circuit can be connected again.

[0003] The thermal protector in the prior art has a base structure as follows: Figure 1 As shown, in addition to the limit platform 9-2, an energy collecting platform 9-3 is also provided in the center of the loading cavity 9-1 of the base 9. Setting the energy collecting platform 9-3 in the center of the loading cavity 9-1 will result in the following defects: 1. Since the heating element 7 is surrounded in the loading cavity 9-1 outside the energy collecting platform 9-3, most of the heat energy generated by the current passing through the heating element 7 is absorbed by the energy collecting platform 9-3 and the surrounding area of ​​the loading cavity 9-1, and a small part of the heat energy is absorbed by the bimetallic strip 4 above the heating element 7, so that it takes a long time to reach the set temperature value of the bimetallic strip 4, and thus the disconnection time of the protector is long. 2. Due to the long power-on time, the heat energy generated by the heating element 7 is mostly concentrated in the surrounding area of ​​the energy collecting platform 9-3 and the loading cavity 9-1, and the long-term operation of the thermal protector affects the service life and load-bearing capacity of the heating element 7. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a thermal protector with a reasonable structural design, fast disconnection and strong load-bearing capacity.

[0005] The technical solution adopted by the utility model to solve the above-mentioned problems is: the thermal protector with fast disconnection and strong load-bearing capacity comprises a pin, a cover plate, a movable spring, a bimetallic strip, a static foot one, a static foot two, a heating element, a static foot three and a base, the two ends of the heating element are respectively welded to the static foot one and the static foot two, one end of the movable spring is electrically connected to the static foot one, the other end of the movable spring cooperates with the static foot three, the pin is electrically connected to the static foot three, and its structural feature is: a loading cavity for installing the heating element is provided on the base, a limiting platform for placing the heating element is provided at the bottom of the loading cavity, the heating element is a spiral heating element or a planar heating element, when the heating element is a spiral heating element, the limiting platform is arranged in the form of a plurality of semicircular protrusion structures, when the heating element is a planar heating element, the limiting platform is arranged in the form of two strip-shaped protrusion structures.

[0006] Furthermore, the loading cavity is arranged in a concave circular structure.

[0007] Furthermore, the pins are arranged on the cover plate, and the movable spring, bimetallic strip, static pin one, static pin two, heating element and static pin three are all arranged in a cavity formed by the cover plate and the base.

[0008] Furthermore, the heating element, the bimetallic strip and the movable spring strip are arranged in sequence from bottom to top.

[0009] Furthermore, the contact of the moving spring piece and the contact of the stationary foot three form an energized circuit which is electrically connected in normal state and disconnected in abnormal state.

[0010] Compared with the prior art, the utility model has the following advantages: by eliminating the energy collecting platform inside the loading cavity, the heat energy generated by the heating element is quickly and effectively conducted to the bimetallic strip, thereby accelerating the sudden jump of the bimetallic strip and achieving a faster power-off protection effect.

[0011] When the resistance of the heating element and the set temperature of the bimetallic strip remain unchanged, when the refrigeration compressor fails, the current disconnection time of the thermal protector without an energy gathering platform is shorter than that of the thermal protector with an energy gathering platform; specifically, a heating element with the same cross-sectional area and resistance value is more resistant to impact when the overcurrent time is short than that when the overcurrent time is long, which relatively improves the heating element's ability to resist load-bearing impact and its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a thermal protector base in the prior art.

[0013] Figure 2 It is a three-dimensional structural schematic diagram of a thermal protector according to an embodiment of the utility model.

[0014] Figure 3 It is a schematic diagram of the explosion structure of the thermal protector of Example 1 of the utility model.

[0015] Figure 4 It is a three-dimensional structural schematic diagram of the base of Example 1 of the utility model.

[0016] Figure 5 It is a schematic diagram of the explosion structure of the thermal protector of Example 2 of the utility model.

[0017] Figure 6 It is a schematic diagram of the three-dimensional structure of the base of Example 2 of the utility model.

[0018] In the figure: pin 1, cover plate 2, moving spring 3, bimetallic strip 4, static pin 1 5, static pin 2 6, heating element 7, static pin 3 8, base 9,

[0019] Loading chamber 9-1, limiting platform 9-2, energy gathering platform 9-3. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0021] Example

[0022] See also Figures 2 to 6 As shown, it should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, if there are references to terms such as "upper", "lower", "left", "right", "middle" and "one" in this specification, they are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship, without substantially changing the technical content, should also be regarded as the scope of the implementation of the utility model.

[0023] Example 1 (such as Figure 2 , 3 -4).

[0024] The thermal protector with fast disconnection and strong load-bearing capacity in this embodiment includes a pin 1, a cover plate 2, a movable reed 3, a bimetallic strip 4, a static pin 1 5, a static pin 2 6, a heating element 7, a static pin 3 8 and a base 9. The two ends of the heating element 7 are respectively welded to the static pin 1 5 and the static pin 2 6, one end of the movable reed 3 is electrically connected to the static pin 1 5, the other end of the movable reed 3 cooperates with the static pin 3 8, and the pin 1 is electrically connected to the static pin 3 8.

[0025] The pin 1 in this embodiment is arranged on the cover plate 2, and the movable reed 3, the bimetallic strip 4, the static pin 1 5, the static pin 2 6, the heating element 7, and the static pin 3 8 are all arranged in a cavity formed by the cover plate 2 and the base 9. The heating element 7, the bimetallic strip 4 and the movable reed 3 are arranged in sequence from bottom to top, and the contact of the movable reed 3 and the contact of the static pin 3 8 constitute an energized circuit which is electrically connected in normal state and disconnected in abnormal state.

[0026] The base 9 in this embodiment is provided with a loading cavity 9-1 for installing the heating element 7. The loading cavity 9-1 is a concave circular structure. The bottom of the loading cavity 9-1 is provided with a limiting platform 9-2 for placing the heating element 7. The heating element 7 is a spiral heating element or a planar heating element. When the heating element 7 is a spiral heating element, the limiting platform 9-2 is provided with a plurality of semicircular raised structures.

[0027] When the spiral heating element is installed in the loading cavity 9-1 provided with a plurality of semicircular protrusion structures, the heat energy generated when the spiral heating element is energized and generates heat is no longer absorbed by the energy collecting platform 9-3 in the loading cavity 9-1, but directly radiates the heat energy to the bimetallic strip 4 above, thereby accelerating the accumulation of heat energy of the bimetallic strip 4 and achieving a sudden jump to the set temperature value.

[0028] The thermal protector with fast disconnection and strong load-bearing capacity is connected to the compressor through the three-core terminal of the compressor. Just insert the pin 1 into the three-core terminal of the compressor; at the same time, the connecting plug of the static pin 2 6 is used as the power connection; then insert the starter into the three-core terminal of the compressor and make an electrical connection, and then it can be put into normal use. When the grid voltage is too high or too low or the refrigeration system fails, the bimetallic strip 4 is deformed by heat, pushing the contact of the moving reed 3 away from the contact of the static pin 3 8, and the thermal protector is activated, thereby cutting off the above-mentioned protective circuit, thereby protecting the compressor motor.

[0029] Example 2 (such as Figure 2 , 5 -6).

[0030] The thermal protector with fast disconnection and strong load-bearing capacity in this embodiment includes a pin 1, a cover plate 2, a movable reed 3, a bimetallic strip 4, a static pin 1 5, a static pin 2 6, a heating element 7, a static pin 3 8 and a base 9. The two ends of the heating element 7 are respectively welded to the static pin 1 5 and the static pin 2 6, one end of the movable reed 3 is electrically connected to the static pin 1 5, the other end of the movable reed 3 cooperates with the static pin 3 8, and the pin 1 is electrically connected to the static pin 3 8.

[0031] The pin 1 in this embodiment is arranged on the cover plate 2, and the movable reed 3, the bimetallic strip 4, the static pin 1 5, the static pin 2 6, the heating element 7, and the static pin 3 8 are all arranged in a cavity formed by the cover plate 2 and the base 9. The heating element 7, the bimetallic strip 4 and the movable reed 3 are arranged in sequence from bottom to top, and the contact of the movable reed 3 and the contact of the static pin 3 8 constitute an energized circuit which is electrically connected in normal state and disconnected in abnormal state.

[0032] The base 9 in this embodiment is provided with a loading cavity 9-1 for installing the heating element 7. The loading cavity 9-1 is a concave circular structure. A limiting platform 9-2 for placing the heating element 7 is provided at the bottom of the loading cavity 9-1. The heating element 7 is a spiral heating element or a planar heating element. When the heating element 7 is a planar heating element, the limiting platform 9-2 is provided with two strip-shaped protruding structures.

[0033] When the planar heating element is loaded into the loading cavity 9-1 provided with two strip-shaped protrusion structures, the heat energy generated when the planar heating element is energized and generates heat is no longer absorbed by the energy collecting platform 9-3 in the loading cavity 9-1, but directly radiates the heat energy to the bimetallic strip 4 above, thereby accelerating the accumulation of heat energy of the bimetallic strip 4 and achieving a sudden jump to the set temperature value.

[0034] The thermal protector with fast disconnection and strong load-bearing capacity is connected to the compressor through the three-core terminal of the compressor. Just insert the pin 1 into the three-core terminal of the compressor; at the same time, the connecting plug of the static pin 2 6 is used as the power connection; then insert the starter into the three-core terminal of the compressor and make an electrical connection, and then it can be put into normal use. When the grid voltage is too high or too low or the refrigeration system fails, the bimetallic strip 4 is deformed by heat, pushing the contact of the movable spring piece 3 to separate from the contact of the static pin 3 8, and the thermal protector is activated, thereby cutting off the above-mentioned protective circuit, thereby protecting the compressor motor.

[0035] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the utility model. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the utility model are included in the protection scope of the utility model patent. Technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. A thermal protector with fast disconnection and strong load-bearing capacity, comprising a plug pin (1), a cover plate (2), a movable spring (3), a bimetallic strip (4), a static foot 1 (5), a static foot 2 (6), a heating element (7), a static foot 3 (8) and a base (9), wherein two ends of the heating element (7) are respectively welded to the static foot 1 (5) and the static foot 2 (6), one end of the movable spring (3) is electrically connected to the static foot 1 (5), the other end of the movable spring (3) is mutually matched with the static foot 3 (8), and the plug pin (1) is electrically connected to the static foot 3 (8), characterized in that: The base (9) is provided with a loading cavity (9-1) for mounting a heating element (7); the bottom of the loading cavity (9-1) is provided with a limiting platform (9-2) for placing the heating element (7); the heating element (7) is a spiral heating element or a planar heating element; when the heating element (7) is a spiral heating element, the limiting platform (9-2) is provided with a plurality of semicircular protruding structures; when the heating element (7) is a planar heating element, the limiting platform (9-2) is provided with two strip-shaped protruding structures.

2. The thermal protector with fast disconnection and strong load-bearing capacity according to claim 1 is characterized in that: The loading chamber (9-1) is arranged in a concave circular structure.

3. The thermal protector with fast disconnection and strong load-bearing capacity according to claim 1 is characterized in that: The plug pin (1) is arranged on the cover plate (2), and the movable spring (3), the bimetallic strip (4), the first static pin (5), the second static pin (6), the heating element (7), and the third static pin (8) are all arranged in a cavity formed by the cover plate (2) and the base (9).

4. The thermal protector with fast disconnection and strong load-bearing capacity according to claim 1 is characterized in that: The heating element (7), the bimetallic strip (4) and the movable spring strip (3) are arranged in sequence from bottom to top.

5. The thermal protector with fast disconnection and strong load-bearing capacity according to claim 1 is characterized in that: The contact of the moving spring (3) and the contact of the stationary foot three (8) form an energized circuit which is electrically connected in normal conditions and disconnected in abnormal conditions.

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