Miniature sealed temperature-sensitive thermal protector

Abstract

The utility model belongs to the technical field of thermal protectors, and particularly relates to a miniature sealed temperature-sensitive thermal protector. Comprising a protective shell, a static contact piece is arranged at the bottom end of the inner side of the protective shell, a movable contact piece is arranged above the static contact piece, and a movable contact block is fixedly arranged on the lower end face of the movable contact piece. According to the utility model, through the arrangement of the insulating power-off assembly, the separation distance between the movable contact block and the static contact piece can be reduced, so that the time for separating and contacting the movable contact block and the static contact piece is shortened, and the sensitivity of the thermal protection function of the device is improved; the separated movable contact block and the static contact piece are insulated, so that the situation that current flows between the movable contact block and the static contact piece due to the fact that the separation distance between the movable contact block and the static contact piece is short and the current between the movable contact block and the static contact piece is large can be avoided, and the device cannot thoroughly cut off power of protection equipment; therefore, the protection effect of equipment protected by the device is poor.

Description

Technical Field

[0001] This utility model relates to the field of thermal protector technology, specifically a miniature sealed temperature-sensitive thermal protector. Background Technology

[0002] A thermal protector consists of two different alloy pieces combined together. When an electric current flows through them, they heat up. Because the two alloys have different coefficients of thermal expansion, they inevitably bend in one direction, causing the contacts to separate and cutting off the power. This protects the electrical equipment. A thermal protector can also be called a temperature control switch, thermostat, thermal protection switch, or temperature switch.

[0003] Currently, commonly used thermal protectors separate the assembled alloy plates by a short distance to cut off power to electrical equipment in order to improve the temperature sensitivity of the equipment. While this does improve the thermal protector's sensitivity to the temperature of the equipment, the separation distance between the two alloy plates can be further shortened. In addition, if the current of the equipment is large, an electric arc may be generated between the two alloy plates that are separated by a short distance. As a result, current still flows between the two alloy plates that are separated by a short distance, and the power cut-off of the equipment is incomplete, thus making the protection effect of the thermal protector on the protected equipment poor.

[0004] Therefore, we propose a miniature, hermetically sealed, temperature-sensitive thermal protector to solve the above problems. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a miniature sealed temperature-sensitive thermal protector, which solves the problems mentioned in the background section.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0009] A miniature sealed temperature-sensitive thermal protector includes a protective shell. A stationary contact is disposed at the bottom inner side of the protective shell. A movable contact is disposed above the stationary contact. A movable contact block is fixedly disposed on the lower end face of the movable contact. The movable contact block is attached to the upper end face of the stationary contact. A metal sheet is disposed below the movable contact. An insulating power-off component is disposed on one side of the stationary contact. The insulating power-off component is used to separate the movable contact block from the stationary contact and to insulate the current flowing between the movable contact block and the stationary contact.

[0010] Furthermore, the insulating power-off assembly includes two fixed plates, a winding wheel rotatably disposed between the two fixed plates, and levers fixedly disposed at both ends of the winding wheel. Each fixed plate has a lever groove, and the levers at both ends of the winding wheel pass through the lever grooves on the two fixed plates respectively.

[0011] Furthermore, each of the fixing plates is fixedly provided with a fixing block, the fixing block is provided with a placement groove, the placement groove is provided with a limit groove, and the placement groove is provided with a helical spring.

[0012] Furthermore, limiting rods are fixedly provided at both ends of the helical spring. The limiting rod at one end of the helical spring is inserted into the limiting groove inside the placement groove, and the limiting rod at the other end of the helical spring is abutted on the lever that passes through the fixed plate.

[0013] Furthermore, one end of the fixing block is provided with a threaded hole, and a bolt is connected to the threaded hole by a thread. Insulating adhesive is wound on the winding wheel, and a connecting strip is fixedly provided at the end of the insulating adhesive away from the winding wheel. The end of the connecting strip away from the insulating adhesive is fixedly connected to the metal sheet.

[0014] Furthermore, a conductive sheet is fixedly provided at one end of the movable contact piece, and the end of the conductive sheet away from the movable contact piece passes through the protective shell. A support block is fixedly provided at the bottom inner side of the protective shell, and the metal sheet is fixedly provided on the upper surface of the support block.

[0015] Furthermore, the upper surface of the protective shell is provided with a shell cover, and positioning holes are provided at the four corners of the upper surface of the shell cover.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, this utility model provides a miniature sealed temperature-sensitive thermal protector, which has the following advantages:

[0018] This invention, through the setting of the insulating power-off component, not only reduces the separation distance between the moving contact block and the stationary contact piece, thereby shortening the separation and contact time between the moving contact block and the stationary contact piece and improving the sensitivity of the device's thermal protection function, but also, by insulating the separated moving contact block and the stationary contact piece, avoids the current flowing between the moving contact block and the stationary contact piece due to the close separation distance and the large current between them. This would prevent the device from completely cutting off the power to the protected equipment, thus resulting in poor protection of the protected equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2This is a schematic diagram of the overall internal structure of the protective shell of this utility model;

[0021] Figure 3 This is an exploded view of the present invention;

[0022] Figure 4 This is an exploded view of the insulating power-off component of this utility model;

[0023] Figure 5 This is a perspective view of the connection between the moving contact piece and the conductive piece of this utility model.

[0024] In the diagram: 1. Protective shell; 2. Stationary contact piece; 3. Moving contact piece; 30. Moving contact block; 4. Metal sheet; 5. Insulated power-off assembly; 501. Fixing plate; 502. Rewinding reel; 503. Lever; 504. Lever groove; 505. Fixing block; 506. Placement groove; 507. Limiting groove; 508. Helical spring; 509. Bolt; 510. Insulating adhesive; 511. Connecting strip; 6. Conductive sheet; 7. Support block; 8. Shell cover. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example

[0027] like Figure 1-5 As shown in the figure, a miniature sealed temperature-sensitive thermal protector according to one embodiment of the present invention includes a protective shell 1. A stationary contact 2 is provided at the bottom inner side of the protective shell 1. A movable contact 3 is provided above the stationary contact 2. A movable contact block 30 is fixedly provided on the lower end surface of the movable contact 3. The movable contact block 30 is attached to the upper end surface of the stationary contact 2. A metal sheet 4 is provided below the movable contact 3. An insulating power-off component 5 is provided on one side of the stationary contact 2. The insulating power-off component 5 is used to separate the movable contact block 30 from the stationary contact 2 and to insulate the current flowing between the movable contact block 30 and the stationary contact 2.

[0028] like Figure 4As shown, the insulating power-off assembly 5 includes two fixed plates 501, with a winding wheel 502 rotatably mounted between the two fixed plates 501. A lever 503 is fixedly mounted at both ends of the winding wheel 502. Each fixed plate 501 has a lever groove 504, through which the levers 503 at both ends of the winding wheel 502 pass. Each fixed plate 501 has a fixed block 505, with a placement groove 506. A limiting groove 507 is formed within the placement groove 506, and a helical spring 508 is placed within the placement groove 506. Limiting rods are fixedly mounted at both ends of the helical spring 508. One limiting rod of the helical spring 508 is inserted into the limiting groove 507 inside the placement groove 506, while the other limiting rod of the helical spring 508 rests on the lever 503 passing through the fixed plate 501. One end of the fixing block 505 is provided with a threaded hole, and a bolt 509 is threadedly connected in the threaded hole. Insulating adhesive 510 is wound on the winding wheel 502. A connecting strip 511 is fixedly provided at the end of the insulating adhesive 510 away from the winding wheel 502. The end of the connecting strip 511 away from the insulating adhesive 510 is fixedly connected to the metal sheet 4.

[0029] The installation of the insulating power-off component 5 not only reduces the separation distance between the moving contact block 30 and the stationary contact piece 2, thereby shortening the separation and contact time between the moving contact block 30 and the stationary contact piece 2 and improving the sensitivity of the thermal protection function of the device, but also prevents current from flowing between the moving contact block 30 and the stationary contact piece 2 due to the close separation distance between them and the large current between them. This would result in incomplete power-off of the protected equipment and poor protection effect of the protected equipment.

[0030] The lever 503, the slot 504, the fixing block 505, the placement slot 506, the limiting slot 507, the helical spring 508, and the limiting rods at both ends of the helical spring 508 work together to automatically rewind the insulating adhesive 510. In addition, the bolt 509 is used to restrict the helical spring 508 within the placement slot 506, thereby preventing the helical spring 508 from jumping out of the placement slot 506 when the limiting rods at both ends of the helical spring 508 are under force.

[0031] A conductive sheet 6 is fixedly disposed at one end of the movable contact 3. The end of the conductive sheet 6 away from the movable contact 3 passes through the protective shell 1. A support block 7 is fixedly disposed at the bottom inner side of the protective shell 1. The metal sheet 4 is fixedly disposed on the upper surface of the support block 7. A shell cover 8 is disposed on the upper surface of the protective shell 1. Positioning holes are provided at the four corners of the upper surface of the shell cover 8.

[0032] The cover 8 and the protective shell 1 form a sealed space, which can protect the components located inside the protective shell 1.

[0033] The cover 8 and the positioning hole make the cover 8 easy to remove, which makes it easy to inspect and maintain the internal components of the protective shell 1. The support block 7 supports the metal sheet 4.

[0034] The working principle of this practical application is as follows:

[0035] When the temperature at the location of the thermal protector rises to the predetermined temperature protection value, the metal sheet 4 bends due to heat. During the bending process, the metal sheet 4 moves the insulating adhesive 510 towards the moving contact block 30 via the connecting belt 511. During this movement, the winding wheel 502 rotates, releasing the insulating adhesive 510 wound on the winding wheel 502. The rotation of the winding wheel 502 drives the lever 503 to rotate within the lever groove 504. The rotation of the lever 503 drives the helical spring 508 to rotate via the limit rod mounted on it. When the insulating adhesive 510 passes between the moving contact block 30 and the stationary contact piece 2, the moving contact block 30 separates from the stationary contact piece 2, thus breaking the circuit and protecting the corresponding electrical appliances. The equipment will not overheat and be damaged, and there will be no current flow between the moving contact block 30 and the stationary contact piece 2. When the temperature at the location of the thermal protector drops to a certain value, the metal piece 4 will gradually return to its original state. During the recovery process, the tension on the insulating adhesive 510 gradually decreases, and the helical spring 508 pushes the lever 503 back to its original position through its own elastic characteristics. During the recovery process, the lever 503 will drive the winding wheel 502 to rotate, thereby restoring the winding wheel 502 to its original position. During the rotation of the winding wheel 502, the insulating adhesive 510 passing between the moving contact block 30 and the stationary contact piece 2 will be wound up, thereby restoring the contact state between the moving contact block 30 and the stationary contact piece 2.

[0036] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A miniature sealed temperature-sensitive thermal protector, comprising a protective shell (1), characterized in that: A stationary contact piece (2) is provided at the bottom inner side of the protective shell (1). A movable contact piece (3) is provided above the stationary contact piece (2). A movable contact block (30) is fixedly provided on the lower end face of the movable contact piece (3). The movable contact block (30) is attached to the upper end face of the stationary contact piece (2). A metal sheet (4) is provided below the movable contact piece (3). An insulating power-off assembly (5) is provided on one side of the stationary contact piece (2). The insulating power-off assembly (5) is used to separate the movable contact block (30) from the stationary contact piece (2) and to insulate the current flowing between the movable contact block (30) and the stationary contact piece (2).

2. The miniature sealed temperature-sensitive thermal protector according to claim 1, characterized in that: The insulating power-off assembly (5) includes two fixed plates (501) fixedly disposed, and a winding wheel (502) is rotatably disposed between the two fixed plates (501). A lever (503) is fixedly disposed at both ends of the winding wheel (502). A slot (504) is provided on each of the fixed plates (501). The levers (503) at both ends of the winding wheel (502) pass through the slots (504) on the two fixed plates (501) respectively.

3. A miniature sealed temperature-sensitive thermal protector according to claim 2, characterized in that: Each of the fixed plates (501) is fixedly provided with a fixing block (505), and the fixing block (505) is provided with a placement groove (506). The placement groove (506) is provided with a limit groove (507), and the placement groove (506) is provided with a helical spring (508).

4. A miniature sealed temperature-sensitive thermal protector according to claim 3, characterized in that: Limiting rods are fixedly provided at both ends of the helical spring (508). The limiting rod at one end of the helical spring (508) is inserted into the limiting groove (507) inside the placement groove (506), and the limiting rod at the other end of the helical spring (508) is abutted on the lever (503) that passes through the fixed plate (501).

5. A miniature sealed temperature-sensitive thermal protector according to claim 3, characterized in that: One end of the fixing block (505) is provided with a threaded hole, and a bolt (509) is threadedly connected in the threaded hole. Insulating adhesive (510) is wound on the winding wheel (502). A connecting strip (511) is fixedly provided at the end of the insulating adhesive (510) away from the winding wheel (502). The end of the connecting strip (511) away from the insulating adhesive (510) is fixedly connected to the metal sheet (4).

6. A miniature sealed temperature-sensitive thermal protector according to claim 1, characterized in that: A conductive sheet (6) is fixedly provided at one end of the movable contact (3). The end of the conductive sheet (6) away from the movable contact (3) passes through the protective shell (1). A support block (7) is fixedly provided at the bottom of the inner side of the protective shell (1). The metal sheet (4) is fixedly provided on the upper surface of the support block (7).

7. A miniature sealed temperature-sensitive thermal protector according to claim 1, characterized in that: The upper end face of the protective shell (1) is provided with a shell cover (8), and positioning holes are provided at the four corners of the upper end face of the shell cover (8).

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