A sealed thermal protector

Abstract

The present invention discloses a sealed thermal protector, comprising: a protector substrate, a heat exhaust pipe group and a heated driving component, a sealing box is fixedly installed on the surface of the protector substrate, and a support plate located inside the sealing box is fixedly installed on the surface of the protector substrate, a main electric control board is rotatably installed on the top of the support plate, the heated driving component is fixedly installed on the inner side of the protector substrate and the top is opposite to the bottom surface of the main electric control board, and the surface of the protector substrate is provided with an access electrode and a support plate, and the end of the access electrode is electrically connected to the end of the main electric control board. In the present invention, by setting a new sealed conduction structure, the corrosion-resistant heat exhaust pipe group efficiently conducts the external environment temperature to the inside of the heated driving component, realizes the thermal expansion of the medium inside the heated driving component, thereby pushing the main electric control board to deflect, realizes the disconnection control of the access electrode and the first output electrode, realizes the separation of the temperature sensing structure and the circuit breaker control structure, and ensures the sealing effect of the protector substrate.

Description

Technical Field

[0001] The invention relates to the technical field of thermal protectors, in particular to a sealed thermal protector. Background Art

[0002] Thermal protectors, also known as temperature control switches and temperature protectors, are devices used to prevent electrical equipment from being damaged due to overclocking. In order to prevent the thermal protector from being damaged due to external impacts during use, some thermal protectors are designed to be sealed. In the current electrical and electronic industries, thermal protectors are used as basic safety devices in motors, transformers, circuit breakers and various electronic components to prevent serious consequences such as fires, mechanical failures and circuit damage caused by overheating of equipment. However, there is a significant problem in the design and application of traditional thermal protectors - poor sealing effect.

[0003] Traditional thermal protectors mainly sense the temperature of equipment or components through direct contact with the external environment for heat conduction. Although this design method is simple and direct, it has many disadvantages. First, due to the large heat exchange area between the thermal protector and the external environment, it is easily affected by external environmental temperature fluctuations, resulting in inaccurate temperature perception, which in turn affects the response speed and accuracy of the thermal protector.

[0004] In addition, factors such as humidity and corrosive gases in the external environment can penetrate into the thermal protector through unsealed interfaces or gaps, causing corrosion to key components such as thermal-sensing jumpers. As the core component of the thermal protector, the thermal-sensing jumper is usually made of bimetallic strips or thermistors. These materials are prone to chemical changes when exposed to corrosive environments for a long time, resulting in performance degradation or even failure. Once the thermal-sensing jumper is damaged, the thermal protector will not be able to accurately monitor the temperature of the equipment and cut off the power supply when necessary, thus losing its due protective function. Summary of the invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0006] To this end, the technical solution adopted by the present invention is: a sealed thermal protector, comprising: a protector substrate, a heat exhaust pipe group and a heat receiving drive component, a sealing box is fixedly installed on the surface of the protector substrate, and a support plate located inside the sealing box is fixedly installed on the surface of the protector substrate, a main electric control board is rotatably installed on the top of the support plate, the heat receiving drive component is fixedly installed on the inner side of the protector substrate and the top end faces the bottom surface of the main electric control board, an access electrode and a support plate are provided on the surface of the protector substrate, and the end of the access electrode is electrically connected to the end of the main electric control board;

[0007] The heat exhaust pipe group includes a heat conduction plate, a heating tube and a temperature recovery seat, and a return pipe and a conduction pipe connected between the heat conduction plate and the temperature recovery seat, one end of the heat conduction plate is fixedly installed on the inner side of the heating tube, and the surface of the heat conduction plate is provided with a heat conduction fin located on the inner side of the heating tube, the inner side of the conduction pipe is provided with a capillary tube, and the surface of the temperature recovery seat is fixedly installed with a heat dissipation fin; the heat receiving drive component includes a hot cylinder seat, a piston top pin, a heated seat and an electric heating coil sleeved on the outer side of the hot cylinder seat, the surface of the protector substrate is provided with a control electrode electrically connected to the electric heating coil, the inner side of the hot cylinder seat is filled with a thermal expansion medium for soaking the heated seat, the bottom end of the piston top pin is slidably installed on the inner side of the hot cylinder seat, and the top end of the piston top pin is used to support the main electric control board.

[0008] In a preferred example, the present invention can be further configured as follows: a first lead-out electrode (102) and a second lead-out electrode are provided on the surface of the protector substrate, the first lead-out electrode and the second lead-out electrode are located in the same vertical direction and are symmetrically arranged with respect to the surface of the main electric control board.

[0009] In a preferred example, the present invention can be further configured as follows: the heat conducting plate is fixedly mounted on the bottom surface of the hot cylinder seat, and a thermal grease layer is provided between the bottom surface of the heated seat and the top surface of the heat conducting plate.

[0010] In a preferred example, the present invention can be further configured as follows: the heating tubes, the temperature return seat, the reflux tubes and the conduction tubes are in two groups and are symmetrically arranged on both sides of the heat conducting plate, and the heat conducting plate and the heating seat are metal components.

[0011] In a preferred example, the present invention can be further configured as follows: the inner sides of the heating tube and the temperature recovery seat are filled with a working medium, the working medium is a phase-change liquid, the inner side of the conduction tube is provided with a reflux gap between the capillaries, and the cross-section and surface of the capillaries are provided with a number of densely distributed capillary holes.

[0012] In a preferred example, the present invention can be further configured as follows: the conduction pipe is arranged obliquely and its two ends are respectively connected to the heating pipe and the temperature return seat, and the reflux pipe is in a zigzag structure.

[0013] In a preferred example, the present invention can be further configured as follows: the electric heating coil on the surface of the hot cylinder seat is arranged in a spiral winding, the hot cylinder seat is a ceramic or metal component, and the top surface of the heated seat is provided with a plurality of wing rods located inside the hot cylinder seat.

[0014] In a preferred example, the present invention can be further configured as follows: the thermal expansion medium is one of alcohol or kerosene, and the bottom end of the piston top pin is provided with a piston that matches the inner diameter of the thermal cylinder seat.

[0015] The beneficial effects achieved by the present invention are:

[0016] 1. In the present invention, by setting a new sealed conduction structure, the corrosion-resistant heat exhaust pipe group efficiently conducts the external environmental temperature to the inside of the heated driving component, realizes the thermal expansion of the medium inside the heated driving component, thereby pushing the main electric control board to deflect, realizes the disconnection control of the access electrode and the first output electrode, realizes the separation of the temperature sensing structure and the circuit breaker control structure, and ensures the sealing effect of the protector substrate.

[0017] 2. In the present invention, the external ambient temperature is sensed by the heat conduction plate to heat the working medium inside the heating tube and the hot cylinder seat synchronously, and the capillary tube inside the heating tube performs the capillary traction effect of the heat flow and introduces the heat into the temperature return seat for heat dissipation and reflux, thereby realizing rapid cooling and heating of the heat conduction plate, and the heat conduction plate is reheated by the working device or the ambient temperature and then transferred to the heated driving component again, thereby sensing the working device temperature in real time.

[0018] 3. In the present invention, by connecting the electric heating coil on the surface of the hot cylinder seat with the control electrode, the high-power line between the input electrode and the first output electrode can be independently controlled through the low-power circuit line of the electric heating coil, and high-power electrical appliances can be controlled. It has a high carrying capacity and can carry high current loads. It is suitable for various electrical equipment, or through the connection of the electric heating coil with various protection circuits, the practicality of the thermal protector is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the surface structure of a protector substrate according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of a heat exhaust pipe group and a heat receiving drive component according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of a heat exhaust pipe group according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the exploded structure of a heat exhaust pipe group according to an embodiment of the present invention;

[0024] Figure 6 A schematic diagram of a cross-sectional structure of a hot cylinder seat according to an embodiment of the present invention;

[0025] Figure 7 The figure is a schematic diagram of the cross-sectional structure of a return pipe and a conduction pipe according to an embodiment of the present invention.

[0026] Reference numerals:

[0027] 100, protector substrate; 110, sealing box; 120, support plate; 130, main electric control board; 101, access electrode; 102, first output electrode; 103, second output electrode; 104, control electrode;

[0028] 200, heat exhaust pipe group; 210, heat conduction plate; 220, heating pipe; 230, temperature return seat; 240, reflux pipe; 250, conduction pipe; 260, capillary tube; 211, heat conduction fin; 231, heat dissipation fin; 251, reflux gap;

[0029] 300, heated driving assembly; 310, hot cylinder seat; 320, piston top pin; 330, heated seat; 340, thermal expansion medium. DETAILED DESCRIPTION

[0030] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0031] It is to be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention.

[0032] A sealed thermal protector provided by some embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0033] Combination Figure 1-Figure 7 As shown, a sealed thermal protector provided by the present invention comprises: a protector substrate 100, a heat exhaust pipe group 200 and a heat receiving drive component 300, a sealing box 110 is fixedly mounted on the surface of the protector substrate 100, and a support plate 120 located inside the sealing box 110 is fixedly mounted on the surface of the protector substrate 100, a main electric control board 130 is rotatably mounted on the top of the support plate 120, the heat receiving drive component 300 is fixedly mounted on the inner side of the protector substrate 100 and the top end faces the bottom surface of the main electric control board 130, an access electrode 101 and a support plate 120 are provided on the surface of the protector substrate 100, and the end of the access electrode 101 is electrically connected to the end of the main electric control board 130;

[0034] The heat exhaust pipe group 200 includes a heat conducting plate 210, a heating pipe 220, a temperature recovery seat 230, and a return pipe 240 and a conduction pipe 250 connected between the heat conducting plate 210 and the temperature recovery seat 230. One end of the heat conducting plate 210 is fixedly installed on the inner side of the heating pipe 220, and the surface of the heat conducting plate 210 is provided with a heat conducting fin 211 located on the inner side of the heating pipe 220. A capillary tube 260 is provided on the inner side of the conduction pipe 250, and a heat dissipation fin 231 is fixedly installed on the surface of the temperature recovery seat 230. The heat-receiving drive assembly 300 includes a hot cylinder seat 310, a piston top pin 320, a heated seat 330 and an electric heating coil sleeved on the outside of the hot cylinder seat 310. The surface of the protector substrate 100 is provided with a control electrode 104 electrically connected to the electric heating coil. The inner side of the hot cylinder seat 310 is filled with a thermal expansion medium 340 for soaking the heated seat 330. The bottom end of the piston top pin 320 is slidably installed on the inner side of the hot cylinder seat 310, and the top end of the piston top pin 320 is used to support the main electric control board 130.

[0035] In this embodiment, the surface of the protector substrate 100 is provided with a first lead-out electrode 102 and a second lead-out electrode 103 , which are located in the same vertical direction and are symmetrically arranged with respect to the surface of the main electric control board 130 .

[0036] In this embodiment, the heat conducting plate 210 is fixedly mounted on the bottom surface of the hot cylinder seat 310 , and a thermal grease layer is provided between the bottom surface of the heated seat 330 and the top surface of the heat conducting plate 210 .

[0037] In this embodiment, the heating tube 220, the temperature recovery seat 230, the reflux tube 240 and the conduction tube 250 are in two groups and are symmetrically arranged on both sides of the heat conducting plate 210. The heat conducting plate 210 and the heating seat 330 are metal components.

[0038] Specifically, the temperature of the surface of the working device is sensed through the heat conducting plate 210 and the heat receiving seat 330 , and the heat is conducted to the inside of the heating tube 220 and the inside of the hot cylinder seat 310 .

[0039] In this embodiment, the inner side of the heating tube 220 and the temperature recovery seat 230 is filled with a working medium, which is a phase-change liquid. The inner side of the conduction tube 250 is provided with a reflux gap 251 located between the capillaries 260, and the cross-section and surface of the capillaries 260 are provided with a plurality of densely distributed capillary holes.

[0040] Specifically, the heating tube 220 is exposed to the heat source, and this end forms an evaporation section. In the evaporation section, the working medium (such as water, ethanol, ammonia or other low-boiling point liquid) begins to evaporate after being heated. Evaporation is an endothermic process, so it effectively absorbs heat from the heat source. The evaporated working medium (steam) forms bubbles or a steam layer, and the pressure in the evaporation section increases. The capillary 260 is used to transport the evaporated steam to the condensation section of the temperature return seat 230. Since the temperature of the phase change medium inside the temperature return seat 230 is relatively low, the steam begins to condense into liquid. After the liquid condenses, it refluxes along the reflux gap 251 or the inner side of the capillary 260, and quickly transfers a large amount of heat during the phase change of the working medium (usually a cycle from liquid to gas and then back to liquid), thereby quickly cooling the heat conduction plate 210.

[0041] In this embodiment, the conduction pipe 250 is arranged obliquely and its two ends are respectively connected to the heating pipe 220 and the temperature return seat 230, and the return pipe 240 is in a zigzag structure.

[0042] Specifically, by utilizing the directions of the return pipe 240 and the conduction pipe 250 , the condensate can be quickly refluxed inside the return pipe 240 , and the steam can be quickly raised inside the conduction pipe 250 , thereby improving the heat conduction effect.

[0043] In this embodiment, the electric heating coil on the surface of the hot cylinder seat 310 is arranged in a spiral winding manner. The hot cylinder seat 310 is a ceramic or metal component. The top surface of the heated seat 330 is provided with a plurality of wing rods located inside the hot cylinder seat 310.

[0044] Furthermore, the thermal expansion medium 340 is one of alcohol and kerosene, and the bottom end of the piston top pin 320 is provided with a piston matched with the inner diameter of the thermal cylinder seat 310 .

[0045] Specifically, when the thermal protector is in use, the external control circuit can be connected by controlling the electrode 104 to control the temperature of the thermal expansion medium 340 to push out the piston pin 320, thereby disconnecting the temperature recovery seat 230 and the first output electrode 102, and performing remote control.

[0046] The working principle and use process of the present invention:

[0047] When using the sealed thermal protector, the bottom surface of the heat conducting plate 210 is attached to the surface of the working electrical device, and the input electrode 101 and the first output electrode 102 are connected to the working electrical device and its input current respectively, so that the current of the working electrical device is controlled to be on and off through the sealed thermal protector. During operation, the surface temperature of the working electrical device is sensed by the heat conducting plate 210, and the heat conducting plate 210 conducts the high temperature to the heating seat 330 in real time, and the heat expansion medium 340 is heated by the heating seat 330, and the piston push pin 320 is pushed by its thermal expansion effect, so that the contact between the main electric control board 130 and the first output electrode 102 is separated, and then the circuit path between the input electrode 101 and the first output electrode 102 is disconnected, so as to realize overheat protection of the working electrical device; wherein, the high temperature alarm circuit can also be connected to the main electric control board 130 through the second output electrode 103, so as to provide an alarm prompt under high temperature state;

[0048] After the heat conducting plate 210 is heated, the heat of the heat conducting plate 210 can be quickly transferred to the heat dissipation fins 231 through the heat pipe structure formed by the heating pipe 220, the temperature return seat 230, the return pipe 240 and the conduction pipe 250. The heat of the heat conducting plate 210 and the heat receiving seat 330 is quickly reduced by heat exchange with the airflow, so that the piston ejector pin 320 retreats, and the end of the main electric control board 130 and the surface of the first output electrode 102 return to the contact state; and when the heat receiving seat 330 has not reached the set temperature and the piston ejector pin 320 has no obvious ejection effect, the temperature of the working device can be sensed in real time;

[0049] When the thermal protector is in use, the external control circuit can be connected through the control electrode 104. The control circuit can be a remote control circuit, an intelligent temperature sensing circuit, etc. When it is necessary to cut off the current of the working electrical device, the electric heating coil on the surface of the hot cylinder seat 310 can be energized and heated through the control circuit, the thermal expansion medium 340 can be controlled to heat up and the piston push pin 320 can be pushed out, so as to realize the disconnection of the temperature recovery seat 230 and the first output electrode 102, and remote control can be performed to improve the practicality of the thermal protector.

[0050] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A sealed thermal protector, characterized in that: include: A protector substrate (100), a heat exhaust pipe group (200) and a heat receiving drive component (300), wherein a sealing box (110) is fixedly mounted on the surface of the protector substrate (100), and a support plate (120) located inside the sealing box (110) is fixedly mounted on the surface of the protector substrate (100), a main electric control board (130) is rotatably mounted on the top end of the support plate (120), the heat receiving drive component (300) is fixedly mounted on the inside of the protector substrate (100) with the top end facing the bottom surface of the main electric control board (130), an access electrode (101) and a support plate (120) are provided on the surface of the protector substrate (100), and an end of the access electrode (101) is electrically connected to an end of the main electric control board (130); The heat exhaust pipe group (200) comprises a heat conduction plate (210), a heating pipe (220) and a temperature return seat (230), and a return pipe (240) and a conduction pipe (250) connected between the heat conduction plate (210) and the temperature return seat (230); one end of the heat conduction plate (210) is fixedly mounted on the inner side of the heating pipe (220), and a heat conduction fin (211) located on the inner side of the heating pipe (220) is provided on the surface of the heat conduction plate (210); a capillary tube (260) is provided on the inner side of the conduction pipe (250); and a heat dissipation fin (231) is fixedly mounted on the surface of the temperature return seat (230); The heat-receiving drive assembly (300) comprises a hot cylinder seat (310), a piston top pin (320), a heated seat (330), and an electric heating coil sleeved on the outside of the hot cylinder seat (310); a control electrode (104) electrically connected to the electric heating coil is provided on the surface of the protector substrate (100); a heat expansion medium (340) for soaking the heated seat (330) is filled on the inside of the hot cylinder seat (310); the bottom end of the piston top pin (320) is slidably mounted on the inside of the hot cylinder seat (310), and the top end of the piston top pin (320) is used to support the main electric control board (130); A first lead-out electrode (102) and a second lead-out electrode (103) are provided on the surface of the protector substrate (100); the first lead-out electrode (102) and the second lead-out electrode (103) are located in the same vertical direction and are arranged symmetrically with respect to the surface of the main electric control board (130); The inner sides of the heating tube (220) and the temperature return seat (230) are filled with a working medium, the working medium being a phase-change liquid, the inner side of the conduction tube (250) is provided with a reflux gap (251) located between the capillaries (260), and the cross section and surface of the capillaries (260) are provided with a plurality of densely distributed capillary holes.

2. A sealed thermal protector according to claim 1, characterized in that: The heat conducting plate (210) is fixedly mounted on the bottom surface of the hot cylinder seat (310), and a heat conducting grease layer is provided between the bottom surface of the heated seat (330) and the top surface of the heat conducting plate (210).

3. A sealed thermal protector according to claim 1, characterized in that: The heating tube (220), the temperature return seat (230), the reflux tube (240) and the conduction tube (250) are provided in two groups and are symmetrically arranged on both sides of the heat conduction plate (210); the heat conduction plate (210) and the heating seat (330) are metal components.

4. A sealed thermal protector according to claim 1, characterized in that: The conduction pipe (250) is arranged obliquely and its two ends are respectively connected to the heating pipe (220) and the temperature return seat (230); the return pipe (240) is in a zigzag structure.

5. A sealed thermal protector according to claim 1, characterized in that: The electric heating coil on the surface of the hot cylinder seat (310) is arranged in a spiral winding manner, and the top surface of the heated seat (330) is provided with a plurality of wing rods located inside the hot cylinder seat (310).

6. A sealed thermal protector according to claim 1, characterized in that: The bottom end of the piston top pin (320) is provided with a piston matching the inner diameter of the hot cylinder seat (310).

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