A calibratable micro-thermal protector

Abstract

The utility model discloses a calibratable miniature thermal protector relates to miniature thermal protector technical field, including the casing, the casing both ends are equipped with two connecting cables, two connecting cables one end is linked with two arc metal sheets that are arranged in the casing respectively, arc metal sheet one side is equipped with the lock temperature fine adjustment subassembly with locking piece, and the redundancy trigger component is equipped between two arc metal sheets, the temperature sensor is still equipped with in the casing inboard, the utility model discloses a concentric circle arc fatigue compensation groove is arranged to arc metal sheet outer ring, improves the fatigue resistance of arc metal sheet, and through the lock temperature fine adjustment subassembly that " heat conduction screw + C type elastic sheet + arc metal sheet " constitutes, has realized the field action temperature fine adjustment, and through the ratchet groove - pawl one - way locking piece, avoids the temperature run - lost that screw backoff leads.

Description

Technical Field

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

[0002] A caliable miniature thermal protector is a miniaturized overheat protection switch that is commonly used in space-constrained applications such as motors, transformers, and battery packs.

[0003] Existing calibrable miniature thermal protectors have certain problems in use. On the one hand, the bimetallic strip in the miniature thermal protector undergoes repeated heating and cooling, resulting in mechanical fatigue and gradual relaxation of internal stress. This causes the operating point to drift towards the low-temperature side, leading to false tripping before the equipment reaches the dangerous temperature, or delayed tripping when it is actually overheating. On the other hand, the high current density of the contacts in miniature products concentrates arcing energy. Under long-term overload or inductive load, the silver contacts are very prone to melting and welding. Once the contacts stick together, the protector loses its breaking capacity, and the motor windings or lithium battery pack will operate without protection until they burn out.

[0004] Based on this, a calibrable miniature thermal protector is now provided, which can eliminate the drawbacks of existing devices. Utility Model Content

[0005] The purpose of this invention is to provide a calibrable miniature thermal protector to solve the problems in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A calibrable miniature thermal protector includes a housing with two connecting cables at both ends. One end of each connecting cable is connected to two arc-shaped metal plates respectively disposed inside the housing. A temperature-locking fine-tuning component with a locking element is provided on one side of each arc-shaped metal plate. A redundant triggering component is provided between the two arc-shaped metal plates. A temperature sensor is also provided inside the housing.

[0007] Based on the above technical solutions, this utility model also provides the following optional technical solutions: In one alternative: heat-conducting grids are symmetrically arranged on both sides of the housing, and a positioning sleeve for installing the temperature-locking fine-tuning component is provided on the inner wall of the housing.

[0008] In one alternative: one end of the arc-shaped metal sheet is fixed to the housing, the other end of the arc-shaped metal sheet is provided with a conductive contact, the outer ring surface of the arc-shaped metal sheet is provided with a plurality of fatigue compensation grooves, and a C-shaped spring is provided on one side of the fatigue compensation groove, the position of the C-shaped spring matching the positioning sleeve.

[0009] In one alternative: the temperature-locking fine-tuning assembly includes a heat-conducting screw threaded onto a positioning sleeve, one end of the heat-conducting screw abutting against a C-shaped spring, and the other end of the heat-conducting screw having a hexagonal countersunk nut, with an elastic washer provided between the hexagonal countersunk nut and the housing.

[0010] In one alternative: the locking element includes a ratchet groove provided on the outside of the hexagonal countersunk nut, a pawl provided on one side of the ratchet groove, a U-shaped spring piece provided at one end of the pawl, and one end of the U-shaped spring piece being fixed to the outside of the housing by a fixing block.

[0011] In one alternative: the redundant triggering assembly includes a mounting base disposed between two arc-shaped metal plates, one end of the mounting base being fixed to the inner wall of the housing, and the other end of the mounting base being provided with an electromagnet. The mounting base is symmetrically provided with two mounting plates, and a trigger element is slidably mounted on the mounting plates.

[0012] In one alternative embodiment: the trigger includes a push rod slidably mounted on the mounting plate, an iron plate is provided at the end of the push rod near the electromagnet, a limiting ring is provided on the push rod, and a spring is provided between the limiting ring and the mounting plate.

[0013] In one alternative: the housing is made of ceramic, engineering plastic or bakelite material.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model improves the fatigue resistance of the arc-shaped metal sheet by setting concentric arc fatigue compensation grooves on the outer ring of the arc-shaped metal sheet. At the same time, the temperature-locking fine-tuning component composed of "thermal conductive screw + C-type spring + arc-shaped metal sheet" realizes the fine-tuning of the on-site operating temperature. And the ratchet-pawl one-way locking component avoids the temperature loss caused by screw retraction.

[0015] 2. This utility model sets up an electromagnet-push rod redundant triggering component between two arc-shaped metal plates. When the temperature sensor detects that the temperature exceeds the set threshold, the electromagnet circuit is disconnected, the electromagnet is released from its attraction to the push rod, and the push rod, under the action of the spring, pushes open the conductive contacts on the two arc-shaped metal plates, thus avoiding the situation of "not disconnecting when it should" caused by the contact sticking together. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the arc-shaped metal sheet in this utility model.

[0018] Figure 3 This is a schematic diagram of the temperature-locking fine-tuning component in this utility model.

[0019] Figure 4 This is a schematic diagram of the redundant triggering component in this utility model.

[0020] Figure reference numerals: 100, housing; 101, heat-conducting grid; 102, positioning sleeve; 200, connecting cable; 300, arc-shaped metal sheet; 301, conductive contact; 302, fatigue compensation groove; 303, C-shaped spring; 400, temperature-locking fine-tuning component; 401, heat-conducting screw; 402, hexagonal countersunk nut; 403, elastic washer; 404, ratchet groove; 405, pawl; 406, U-shaped spring; 407, fixing block; 500, redundant triggering component; 501, mounting base; 502, electromagnet; 503, mounting plate; 504, push rod; 505, iron sheet; 506, limit ring; 507, spring; 600, temperature sensor. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] In one embodiment, such as Figure 1 and Figure 2 As shown, a calibrable miniature thermal protector includes a housing 100. Two connecting cables 200 are located at both ends of the housing 100. One end of each cable 200 is connected to two arc-shaped metal plates 300 respectively disposed within the housing 100. A temperature-locking fine-tuning component 400 with a locking element is located on one side of each arc-shaped metal plate 300. A redundant trigger component 500 is located between the two arc-shaped metal plates 300. A temperature sensor 600 is also located inside the housing 100. In use, when the circuit is working normally, the two arc-shaped metal plates 300... Contact is formed to create a circuit. When the ambient temperature or equipment temperature exceeds the set value, the two arc-shaped metal plates 300 automatically disconnect, thereby breaking the circuit and protecting the equipment. The temperature-locking fine-tuning component 400 can fine-tune the disconnection temperature of the arc-shaped metal plates 300. When the temperature sensor 600 detects that the temperature inside the housing 100 exceeds the set value, the redundant trigger component 500 will force the two arc-shaped metal plates 300 to open, avoiding the situation where the two arc-shaped metal plates 300 "should not disconnect" due to contact adhesion.

[0023] In one embodiment, such as Figure 2 As shown, heat-conducting grilles 101 are symmetrically arranged on both sides of the housing 100, and a positioning sleeve 102 for installing the temperature-locking fine-tuning component 400 is provided on the inner wall of the housing 100. The heat-conducting grilles 101 improve the protector's temperature sensitivity to the external environment.

[0024] In one embodiment, such as Figure 2As shown, one end of the arc-shaped metal sheet 300 is fixed to the housing 100, and the other end of the arc-shaped metal sheet 300 is provided with a conductive contact 301. The outer ring surface of the arc-shaped metal sheet 300 is provided with several fatigue compensation grooves 302. A C-shaped spring piece 303 is provided on one side of the fatigue compensation groove 302. The position of the C-shaped spring piece 303 matches the positioning sleeve 102. During normal use, the conductive contact 301 on the arc-shaped metal sheet 300 is in contact with the inner ring of another arc-shaped metal sheet 300 to keep the circuit connected. When the temperature exceeds the set value, the arc-shaped metal sheet 300 bounces up under the action of temperature stress, causing the conductive contact 301 to separate from the other arc-shaped metal sheet 300, thereby breaking the circuit. The fatigue compensation groove 302 can improve the fatigue resistance of the arc-shaped metal sheet 300.

[0025] In one embodiment, such as Figure 3 As shown, the temperature-locking fine-tuning assembly 400 includes a heat-conducting screw 401 threaded onto the positioning sleeve 102. One end of the heat-conducting screw 401 abuts against a C-shaped spring 303, and the other end of the heat-conducting screw 401 is provided with a hexagonal countersunk nut 402. An elastic washer 403 is provided between the hexagonal countersunk nut 402 and the housing 100. The locking component includes a ratchet 404 provided on the outside of the hexagonal countersunk nut 402. A pawl 405 is provided on one side of the ratchet 404. A U-shaped spring 406 is provided at one end of the pawl 405. One end of the U-shaped spring 406 is fixed to the outside of the housing 100 by a fixing block 407. In use, by rotating the heat-conducting screw 401, the pressure of the heat-conducting screw 401 on the C-shaped spring 303 is adjusted, thereby realizing the fine-tuning of the operating temperature of the arc-shaped metal sheet 300. At the same time, the pawl 405 and the ratchet 404 prevent the heat-conducting screw 401 from disengaging, thus preventing temperature loss.

[0026] In one embodiment, such as Figure 4 As shown, the redundant trigger assembly 500 includes a mounting base 501 disposed between two arc-shaped metal plates 300. One end of the mounting base 501 is fixed to the inner wall of the housing 100, and the other end of the mounting base 501 is provided with an electromagnet 502. Two mounting plates 503 are symmetrically arranged above and below the mounting base 501. A trigger element is slidably mounted on the mounting plate 503. The trigger element includes a push rod 504 slidably mounted on the mounting plate 503. An iron plate 505 is provided at the end of the push rod 504 near the electromagnet 502, and a limiting ring 506 is provided on the push rod 504. A spring 507 is provided between the limiting ring 506 and the mounting plate 503. When the protector is working normally, the electromagnet 502 is energized and attracts the two push rods 504. When the temperature sensor 600 detects that the temperature inside the housing 100 exceeds the set value, the circuit of the electromagnet 502 is disconnected, releasing its attraction to the iron plate 505. Under the action of the spring 507, the push rods 504 forcefully push the two arc-shaped metal plates 300 apart, avoiding the situation where the two arc-shaped metal plates 300 "should not break" due to contact sticking.

[0027] In one embodiment, the housing 100 is made of ceramic material, engineering plastic material, or bakelite material. Ceramic material, engineering plastic material, or bakelite material has good insulation and heat resistance, so it can provide good insulation between the above-mentioned components and the outside world when the power is on normally.

[0028] The above embodiment discloses a calibrable miniature thermal protector. By setting a concentric arc fatigue compensation groove 302 on the outer ring of the arc-shaped metal sheet 300, the fatigue resistance of the arc-shaped metal sheet 300 is improved. At the same time, the temperature-locking fine-tuning component 400, composed of "thermal conductive screw 401 + C-type spring 303 + arc-shaped metal sheet 300", realizes on-site temperature fine-tuning. The ratchet groove 404-pawl 405 one-way locking component prevents temperature loss caused by the thermal conductive screw 401 uncoiling. By setting a redundant trigger component 500, when the protector is working normally, the electromagnet 502 is in the energized state and attracts two push rods 504. When the temperature sensor 600 detects that the temperature inside the housing 100 exceeds the set value, the circuit of the electromagnet 502 is disconnected, releasing its attraction to the iron sheet 505. Under the action of the spring 507, the push rods 504 forcefully push the two arc-shaped metal sheets 300 apart, avoiding the situation where the two arc-shaped metal sheets 300 "should not break" due to contact adhesion.

[0029] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A calibrable miniature thermal protector, comprising a housing (100) having two connecting cables (200) at both ends of the housing (100), characterized in that, One end of each of the two connecting cables (200) is connected to two arc-shaped metal plates (300) respectively disposed inside the housing (100). A temperature-locking fine-tuning component (400) with a locking element is provided on one side of the arc-shaped metal plate (300). A redundant trigger component (500) is provided between the two arc-shaped metal plates (300). A temperature sensor (600) is also provided inside the housing (100).

2. The calibrable miniature thermal protector according to claim 1, characterized in that, The housing (100) has symmetrical heat-conducting grids (101) on both sides, and the inner wall of the housing (100) has a positioning sleeve (102) for installing the temperature-locking fine-tuning component (400).

3. A calibrable miniature thermal protector according to claim 1, characterized in that, One end of the arc-shaped metal sheet (300) is fixed on the housing (100), and the other end of the arc-shaped metal sheet (300) is provided with a conductive contact (301). The outer ring surface of the arc-shaped metal sheet (300) is provided with several fatigue compensation grooves (302). A C-shaped spring (303) is provided on one side of the fatigue compensation groove (302), and the position of the C-shaped spring (303) matches the positioning sleeve (102).

4. A calibrable miniature thermal protector according to claim 1, characterized in that, The temperature-locking fine-tuning assembly (400) includes a thermally conductive screw (401) threaded onto a positioning sleeve (102). One end of the thermally conductive screw (401) abuts against a C-type spring (303), and the other end of the thermally conductive screw (401) is provided with a hexagonal countersunk nut (402). An elastic washer (403) is provided between the hexagonal countersunk nut (402) and the housing (100).

5. A calibrable miniature thermal protector according to claim 1, characterized in that, The locking component includes a ratchet (404) provided on the outside of the hexagonal countersunk nut (402), a pawl (405) provided on one side of the ratchet (404), a U-shaped spring (406) provided at one end of the pawl (405), and one end of the U-shaped spring (406) fixed to the outside of the housing (100) by a fixing block (407).

6. A calibrable miniature thermal protector according to claim 1, characterized in that, The redundant triggering assembly (500) includes a mounting base (501) disposed between two arc-shaped metal plates (300). One end of the mounting base (501) is fixed to the inner wall of the housing (100), and the other end of the mounting base (501) is provided with an electromagnet (502). The mounting base (501) is symmetrically provided with two mounting plates (503) on its upper and lower sides, and a trigger element is slidably mounted on the mounting plate (503).

7. A calibrable miniature thermal protector according to claim 6, characterized in that, The trigger includes a push rod (504) slidably mounted on the mounting plate (503). The push rod (504) has an iron plate (505) at one end near the electromagnet (502). A limiting ring (506) is provided on the push rod (504). A spring (507) is provided between the limiting ring (506) and the mounting plate (503).

8. A calibrable miniature thermal protector according to claim 1, characterized in that, The housing (100) is made of ceramic, engineering plastic or bakelite.

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