CN215262134U

CN215262134U - Temperature measuring structure of switch electric appliance

Info

Publication number: CN215262134U
Application number: CN202120502062.8U
Authority: CN
Inventors: 葛伟骏; 王艳杨
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2021-03-09
Filing date: 2021-03-09
Publication date: 2021-12-21
Anticipated expiration: 2031-03-09

Abstract

The utility model provides a temperature measurement structure of switching device, including the temperature measurement unit, the temperature measurement unit includes first casing and heat-conducting element, first casing sets up side by side with switching device along switching device's thickness direction, be equipped with the circuit board in first casing and the temperature sensor who is connected with the circuit board, be equipped with the hole of dodging that is used for dodging heat-conducting element on the first casing, the hole of dodging and the cooperation of temperature sensor on the first casing are inserted to heat-conducting element's one end, heat-conducting element's the other end inserts switching device and with heat transfer to temperature sensor, through heat-conducting element with switching device's temperature transfer to temperature sensor, when switching device leads to the temperature to rise owing to the contact resistance increase, the circuit board passes through the temperature that temperature sensor gathered switching device, avoid the temperature to continue to rise and lead to switching device to burn out.

Description

Temperature measuring structure of switch electric appliance

Technical Field

The utility model relates to a low-voltage apparatus field especially relates to a temperature measurement structure of switching device.

Background

In a low-voltage distribution system, a switching device is often used for protecting the safety of a power supply circuit, and the application is very wide. However, in the normal operation process of the protection circuit, due to the contact resistance between the contact and the contact of the switching device, the contact resistance between the wiring terminal and the external lead and the resistance of other parts, heat is generated when current flows through the switching device, and particularly when poor contact is caused between the wiring terminal and the external lead due to various reasons, the temperature is rapidly increased, and the internal overcurrent protection element of the switching device is not operated, so that the electric device is often burnt, and therefore, the temperature of the switching device needs to be detected in real time to prevent burning.

Although the temperature sensor can be fixed on the shell by glue or other methods when the temperature of the existing switch electric appliance is detected, the temperature sensor and the contact of the switch electric appliance or the wiring terminal of the wiring board are in the same chamber; alternatively, the temperature sensor is glued or otherwise fixed to the switching device contacts or terminal block, but still suffers from the following disadvantages:

(1) the glue connection is unstable, whether the temperature sensor is firmly adhered or not cannot be ensured in the operation process, the detection accuracy of the temperature detection mode is difficult to guarantee theoretically, and the cost of the temperature sensor is high;

(2) the assembly difficulty is high, when the temperature sensor and the control circuit board are electrically connected by adopting a wire and the like to measure the temperature of the multi-pole switch electric appliance, the wiring is complex, the assembly difficulty is high, and the production efficiency is reduced;

(3) the dielectrical property is poor, so that the temperature sensor and the wiring board are in a common cavity or are in direct contact, the temperature measuring system is a weak current system, the main circuit power system of the switching apparatus is usually strong current, and if insulation protection is not performed in place, fluctuation of the power system is often accompanied with instantaneous overvoltage, the temperature measuring system is broken down, the product function is lost, even an electrical fire is caused, and the life and property safety of people can be endangered.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide a temperature measurement structure of switching device of simple structure, security height, simple to operate, suitability are strong.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a temperature measurement structure of switching device, including the temperature measurement unit, the temperature measurement unit includes first casing and heat-conducting element, first casing sets up side by side with switching device along switching device's thickness direction, be equipped with the circuit board in first casing and the temperature sensor who is connected with the circuit board, be equipped with the hole of dodging that is used for dodging heat-conducting element on the first casing, the hole of dodging and the cooperation of temperature sensor on the first casing are inserted to heat-conducting element's one end, heat-conducting element's the other end inserts switching device and with heat transfer to temperature sensor.

Preferably, the switching device comprises a second housing provided with an insulating channel for accommodating the heat conducting element.

Preferably, be equipped with binding post in the second casing, the outer wall of insulating passageway constitutes the cavity that is used for holding binding post, and the other end of heat-conducting element inserts insulating passageway and binding post contact cooperation.

Preferably, the switch device comprises one or more switch devices, when the switch device comprises a plurality of switch devices, the switch devices are arranged side by side along the thickness direction of the switch device, and the insulation channels of the switch devices are coaxially arranged.

Preferably, one end of the insulating channel of the switching device is protruded to form an insertion block, and the other end of the insulating channel is recessed to form an insertion groove matched with the insertion block for being matched with the adjacent switching device.

Preferably, the switch device comprises a plurality of switch devices, the switch devices are arranged side by side along the thickness direction of the switch devices, the switch devices comprise a first switch device and at least one second switch device, and the at least one second switch device is arranged between the first switch device and the first shell; the insulation channel of the second switch electric appliance is of a through hole structure, the insulation channel of the first switch electric appliance is of a counter bore structure, and the heat conduction element penetrates through at least one second switch electric appliance and then is inserted into the counter bore structure of the first switch electric appliance.

Preferably, the switching device is respectively provided with a wiring terminal corresponding to the incoming line end and a wiring terminal corresponding to the outgoing line end, the temperature measuring unit comprises two heat conducting elements, one of the heat conducting elements is matched with the wiring terminal corresponding to the incoming line end of the switching device, and the other heat conducting element is matched with the wiring terminal corresponding to the outgoing line end of the switching device.

Preferably, the circuit board further comprises a driving circuit, and the driving circuit is connected with an operating mechanism of the switching device.

Preferably, the heat conducting element comprises a transmission part and a sensing part which are vertically connected, the transmission part is inserted into the switching device, and the sensing part is arranged opposite to the temperature sensor.

Preferably, the wiring terminal comprises a wiring board, a wiring frame and a wiring screw, the wiring board comprises a limiting part and a wire pressing part connected with the limiting part, and the wiring frame is sleeved on the wire pressing part; the heat conduction element is a copper sheet, the heat conduction element is located above the limiting portion corresponding to the wiring terminal, and the side face of the heat conduction element is opposite to the wiring frame.

The utility model discloses a temperature measurement structure of switching device transmits the temperature of switching device to temperature sensor through heat conduction element, and when switching device leads to the temperature to rise because contact resistance increases, the circuit board passes through the temperature that temperature sensor gathered switching device, avoids the temperature to continue to rise and leads to switching device to burn out.

In addition, the heat conducting element can transfer heat of a plurality of switching devices and a plurality of wiring terminals, and has the characteristics of small part number and low cost.

In addition, the outer wall of the insulating channel for accommodating the heat conducting element forms a part of the cavity for accommodating the wiring terminal, the insulating channel can play a role in insulating and protecting the heat conducting element, and heat generated by the wiring terminal can be transferred to the heat conducting element through the insulating channel, so that the heat can be transferred more quickly.

Drawings

FIG. 1 is one side of the explosion diagram of the temperature measurement structure of the switch electric appliance of the present invention;

FIG. 2 is the other side of the explosion diagram of the temperature measurement structure of the switch electric appliance of the present invention;

FIG. 3 is a partial enlarged view of FIG. 2 in accordance with the present invention;

FIG. 4 is a partial sectional view of the temperature measuring structure of the switching device of the present invention;

fig. 5 is a schematic structural view of the heat conducting element of the present invention;

FIG. 6 is a schematic view of the overall structure of the switch device and the temperature measuring device of the present invention;

fig. 7 is a schematic structural diagram of the temperature measuring device of the present invention.

Detailed Description

As shown in fig. 1-2, the utility model discloses a temperature measurement structure of switching device, including the temperature measurement unit, the temperature measurement unit includes first casing 100 and heat-conducting element 200, first casing 100 sets up side by side with switching device 300 along the thickness direction of switching device 300, be equipped with circuit board 110 in first casing 100 and the temperature sensor 120 of being connected with circuit board 110, be equipped with the hole of dodging (not shown in the figure) that dodges that is used for dodging heat-conducting element 200 on first casing 100, the hole of dodging on first casing 100 is passed to the one end of heat-conducting element 200 and temperature sensor 120 cooperates, the other end of heat-conducting element 200 inserts switching device 300 and transmits the heat to temperature sensor 120.

The utility model discloses a temperature measurement structure of switch electrical apparatus, the temperature with switch electrical apparatus 300 through heat conduction element 200 transmits to temperature sensor 120, when switch electrical apparatus 300 leads to the temperature to rise because contact resistance increases, circuit board 110 passes through temperature sensor 120 and gathers switch electrical apparatus 300's temperature, avoids the temperature to continue to rise and leads to switch electrical apparatus 300 to burn out.

The following describes a specific embodiment of the temperature measurement structure of the switching device according to the present invention with reference to the embodiments shown in fig. 1 to 7. The utility model discloses a temperature measurement structure of switching device is not limited to the description of following embodiment.

As shown in fig. 1-2, the utility model discloses a temperature measurement structure of switching device includes the temperature measurement unit, the temperature measurement unit includes first casing 100 and heat-conducting element 200, first casing 100 sets up side by side with switching device 300 along the thickness direction of switching device 300, be equipped with circuit board 110 in first casing 100 and the temperature sensor 120 of being connected with circuit board 110, be equipped with the hole of dodging that is used for dodging heat-conducting element 200 on first casing 100, the hole of dodging and the contact cooperation of temperature sensor 120 on first casing 100 are inserted to the one end of heat-conducting element 200, the other end of heat-conducting element 200 inserts the position that generates heat that switching device 300 is close to switching device, with heat transfer to temperature sensor 120.

As shown in fig. 1, the temperature measuring structure of the switch electric appliance of the present invention includes a temperature measuring unit and at least one switch electric appliance 300, the temperature measuring unit includes a first casing 100, the circuit board 110 is disposed in the first casing 100, and the first casing 100 is disposed side by side with the switch electric appliance 300 along the thickness direction of the switch electric appliance 300. The two-pole circuit breaker comprises two switching devices 300, wherein each of the two switching devices 300 is provided with two wiring terminals 310, and the two wiring terminals 310 correspond to a wire inlet end and a wire outlet end respectively; two heat conducting elements 200 are arranged on one circuit board 110, one heat conducting element 200 is in contact fit with wiring terminals 310 of corresponding wire inlet ends of at least two switching appliances 300, the other heat conducting element 200 is in contact fit with wiring terminals 310 of corresponding wire outlet ends of at least two switching appliances 300, and the wiring terminals 310 of the wire inlet ends of all the switching appliances 300 transmit temperature through one heat conducting element 200, and similarly, the wiring terminals 310 of the corresponding wire outlet ends transmit temperature through the other heat conducting element 200, so that an independent heat conducting element 200 is not required to be independently and correspondingly arranged on each switching appliance 300, the circuit board has the characteristics of less part number and low cost, and one switching appliance 300, two or more than two switching appliances 300 can be suitable for use, and the circuit board has the characteristic of strong adaptability. Preferably, the temperature measuring unit is particularly suitable for the case of multiple switching devices 300, and the temperature measuring unit is inserted into the avoiding holes of the multiple switching devices 300 at a time through the heat conducting element 200 to be matched with the temperature sensor 120.

Specifically, the temperature measuring unit of the temperature measuring device of this embodiment is used for measuring a two-pole circuit breaker, that is, includes two switching devices 300, the two-pole circuit breaker is respectively connected to different poles, and each pole circuit breaker is composed of one switching device 300, that is, includes two switching devices 300. Of course, the temperature measuring unit can also be used for a single-pole or three-pole or more circuit breaker, and all belong to the protection scope of the present invention. The switching apparatus 300 includes a second housing 320, and a contact system (not shown in the figure), an operating mechanism (not shown in the figure), an overcurrent protection device (not shown in the figure), a terminal 310 corresponding to a wire inlet end, and a terminal 310 corresponding to a wire outlet end, which are respectively disposed in the second housing 320, where the two terminals 310 are respectively disposed at two ends of the switching apparatus 300, the terminal 310 at one end can be seen in fig. 1, and the terminal 310 at the other end can be seen in fig. 2, the contact system is connected to a corresponding circuit through the two terminals 310, the corresponding circuit is turned on to supply power to a load when the contact system is closed, the overcurrent protection device is used to drive the operating mechanism to trip when the circuit has faults such as overload and short circuit, and the operating mechanism is used to break the circuit to protect the circuit. It is understood that the protection function may be implemented by other devices instead of the overcurrent protection device, and is not limited in particular.

As shown in fig. 5, the second housing 320 is provided with an insulating channel 330 for accommodating the heat conducting element 200, since the circuit board 110 is weak current and the switching device 300 is strong current, the insulating channel 330 can ensure the insulation protection of the heat conducting element 200, and prevent the switching device 300 from breaking down the temperature measuring device due to transient overvoltage caused by voltage fluctuation, which may result in product failure or fire, and the insulating channel 330 can limit the heat conducting element 200 for installation and fixation.

Further, the insulating channel 330 is disposed on one side of the connection terminal 310, the outer wall of the insulating channel 330 forms a cavity for accommodating the connection terminal 310, and the other end of the heat conducting element 200 is inserted into the insulating channel 330 to contact with the connection terminal 310, so that the insulating channel 330 can not only play a role of insulating and protecting the heat conducting element 200, but also can transfer heat to the heat conducting element 200 through the insulating channel 330, thereby improving the sensitivity of temperature measurement. In addition, when the switching device 300 normally works, heat is generated by passing current, and if the connection terminal 310 is welded loosely during the assembling process or the connection terminal 310 is in poor contact with an external lead, the local contact resistance is increased, and the temperature at the position is increased. Therefore, the two heat conducting elements 200 are respectively matched with the two wiring terminals 310, so that the temperature of the switching device 300 can be comprehensively monitored, and the switching device has the characteristic of low cost. It can be understood that the temperature measuring unit may also only be provided with one heat conducting element 200, and only transmit the heat of the connecting terminal 310 corresponding to the incoming line end, or the heat of the connecting terminal 310 corresponding to the outgoing line end, or increase the number of the heat conducting elements 200, for example, for monitoring the temperature of the contact system, such as the contact with the fixed contact of the contact system, or the contact with the moving contact when the moving contact is closed, which all belong to the protection scope of the present invention.

Further, when a plurality of switching devices 300 are included, the switching devices 300 are arranged side by side along the thickness direction of the switching devices 300, the insulating channels 330 of the switching devices 300 are coaxially arranged, and the heat conducting element 200 can sequentially pass through the insulating channels 330 and then be inserted into the insulating channel 330 at the tail end, so that the switching devices 300 can share one heat conducting element 200, and each switching device 300 is not required to be independently and correspondingly provided with an independent heat conducting element 200.

Specifically, one temperature measuring unit of this embodiment is simultaneously used for measuring a plurality of switching devices 300, the plurality of switching devices 300 include a first switching device 300A and at least one second switching device 300B, the first switching device 300A is disposed at an interval with the first casing 100, the at least one switching device 300 is disposed between the first switching device 300A and the first casing 100, the insulating channel 330 of the second switching device 300B is a through hole structure, the insulating channel 330 of the first switching device 300A is a counterbore structure, the heat conducting element 200 traverses through the at least one second switching device 300B and then is inserted into the counterbore structure of the first switching device 300A for limiting and matching, and the counterbore structure is used for pushing one end of the heat conducting element 200 away from the temperature sensor 120. It can be understood that the number of the switching devices 300 is N, and N is greater than or equal to 2, the number of the second switching devices 300B is N-1, the number of the first switching devices 300A is 1, it is not necessary to distinguish through holes and counter bores, the first switching devices 300A may also be through holes, and the opening far away from the first housing 100 side is sealed by a cover.

Further, one end of each of the insulating channels 330 of the at least two switching devices 300 is protruded to form an insertion block 331, and the other end of each of the insulating channels 330 is recessed to form an insertion slot 332 engaged with the insertion block 331 of the other insulating channel 330. By inserting the insertion block 331 into the insertion slot 332 for fitting, not only a limiting function can be achieved, but also the extra surface of the insertion block 331 can increase the creepage distance from the heat conducting element 200 to the terminal 310, and further increase the insulation protection effect.

Preferably, the second housing 320 is composed of an upper housing 320A and a lower housing 320B which are oppositely arranged, the insulation passage 330 is composed of an upper passage 330A of the upper housing 320A and a lower passage 330B of the lower housing 320B, and the insertion groove 332 and the insertion block 331 are also arranged at two ends of the upper passage 330A and the lower passage 330B, which can also play a role in increasing creepage distance.

Preferably, the first housing 100 is provided with insertion grooves 332 respectively engaged with the insertion blocks 331 or insertion blocks 331 engaged with the insertion grooves 332, and if the insulation passage 330 protrudes toward the outermost second housing 320, the insulation passage 330 of the outermost second housing 320 is provided with insertion grooves 332 engaged with the insertion blocks 331; if the insulation passage 330 protrudes away from the outermost second housing 320, the insulation passage 330 of the outermost second housing 320 is provided with an insertion block 331 fitted into the insertion groove 332.

As shown in fig. 5, the heat conducting element 200 of the present embodiment is made of a metal material or a non-metal material with low cost and good heat conducting performance, the heat conducting element 200 is in an L-shaped structure, the heat conducting element 200 includes a transmitting portion 210 and an induction portion 220 which are vertically connected, the induction portion 220 is disposed opposite to the temperature sensor 120, the outermost switch appliance 300, that is, the housing of the first switch appliance 300A, pushes the transmitting portion 210 of the heat conducting element 200 away from one end of the temperature sensor 120, so that the induction portion 220 of the heat conducting element 200 close to one end of the temperature sensor 120 is pressed against the temperature sensor 120, the induction portion 220 and the temperature sensor 120 can be tightly attached together, the heat conducting element 200 can be a simple metal plate, also be an alloy or a non-metal, and has good temperature conducting performance, the transmitting portion 210 receives and transmits heat, and the induction portion 220 is in contact with the temperature sensor, because the temperature-sensing element 200 has good thermal conductivity, the temperatures of the transmission part 210 and the sensing part 220 are consistent, and the temperature sensor 120 can sense the temperature in the switch apparatus 300 through the temperature-sensing element 200 and then transmit data to the circuit board. It can be understood that the sensing portion 220 and the temperature sensor 120 may not be in contact with each other, for example, a heat conductive material such as a heat conductive silica gel is disposed between the sensing portion 220 and the temperature sensor 120, which all belong to the protection scope of the present invention.

Preferably, the transmission part 210 is inserted into the switching device 300, two sides of one end of the transmission part 210, which is far away from the sensing part 220, are respectively provided with an inclined introduction surface 211, the introduction surfaces 211 can facilitate the insertion of the heat conducting element 200 into the insulating channel 330, and the sensing part 220 is arranged opposite to the temperature sensor 120, which can accelerate the heat transfer. Preferably, the heat conducting element 200 is a copper sheet.

As shown in fig. 3, the two terminals 310 of the switching apparatus 300 are substantially the same in structure, each terminal 310 includes a terminal block and a terminal frame 311 covering the terminal block, a terminal screw (not shown) is disposed on the terminal frame 311, the terminal screw can fix an external conductor between the terminal block and the terminal frame 311 by screwing, and the heat conducting element 200 is engaged with a terminal base and the terminal block corresponding to the terminal block 310.

Specifically, the wiring board includes the wiring portion that becomes T font structure, and wiring portion includes spacing portion 312 and the line ball portion 313 of being connected with spacing portion 312, and the internal diameter of wire frame 311 is less than the width of spacing portion 312 and is greater than the width of line ball portion 313, and wire frame 311 overlaps on line ball portion 313 with spacing portion 312 spacing cooperation, heat-conducting element 200 is located the top of the spacing portion 312 that corresponds binding post 310, and heat-conducting element 200's side sets up with wire frame 311 relatively, and the space below spacing portion 312 not only can be left in this position, and the external conductor of being convenient for inserts in wire frame 311, can reach the distance of wiring board near moreover, can receive temperature variation more soon. In addition, the width of the position-limiting portion 312 is large, so that the temperature transmission between the position-limiting portion 312 and the heat-conducting element 200 is faster. It is understood that the present embodiment shows only one structure of the connection terminal 310, and the connection terminal 310 has various structures, which are not particularly limited herein.

As shown in fig. 7, the circuit board 110 further includes a driving circuit 130 connected to an operating mechanism of the switching apparatus 300, a driving mechanism is further disposed in the first housing 100, the circuit board 110 collects a temperature of the switching apparatus 300 through the temperature sensor 120, when the temperature reaches a certain value, the driving circuit 130 can drive the operating mechanism through the driving mechanism to break the contact system, so as to break the circuit, the driving mechanism may be an electromagnetic trip, the operating mechanism of the switching apparatus 300 is driven to trip through a linkage shaft, the driving mechanism may also be an electric mechanism including a motor, and the driving gear is driven by the motor to trip the operating mechanism of the switching apparatus 300. It is understood that an alarm unit (not shown) such as a buzzer and/or an indicator light may be further provided, the circuit board 110 may be connected to the driving circuit 130 and the alarm unit at the same time, the driving circuit 130 and the alarm unit may be integrated on the circuit board 110, or only one of the driving circuit 130 and the alarm unit may be selected for connection. Adopt drive circuit 130 and alarm unit simultaneously, alarm unit can be used to instruct tripping operation reason because the temperature is too high, rather than trouble such as overload and short circuit, only adopts alarm unit and does not set up drive circuit 130 time, then only has alarming function, reminds the user to inspect, and does not have automatic tripping's function, all belongs to the utility model discloses a protection range. The switching device of this embodiment may also be a circuit breaker with a remote control function, and the circuit board 110 also functions to control the circuit breaker with the remote control function.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. The utility model provides a temperature measurement structure of switching apparatus, includes temperature measurement unit, its characterized in that: the temperature measuring unit comprises a first shell (100) and a heat conducting element (200), the first shell (100) is arranged side by side with the switching electric appliance (300) along the thickness direction of the switching electric appliance (300), a circuit board (110) and a temperature sensor (120) connected with the circuit board (110) are arranged in the first shell (100), an avoiding hole used for avoiding the heat conducting element (200) is formed in the first shell (100), one end of the heat conducting element (200) is inserted into and penetrates through the avoiding hole in the first shell (100) to be matched with the temperature sensor (120), and the other end of the heat conducting element (200) is inserted into the switching electric appliance (300) to transfer heat to the temperature sensor (120).

2. The temperature measuring structure of the switching apparatus according to claim 1, wherein: the switching device (300) comprises a second housing (320), the second housing (320) being provided with an insulating channel (330) for accommodating the heat conducting element (200).

3. The temperature measuring structure of the switching apparatus according to claim 2, wherein: be equipped with binding post (310) in second casing (320), the outer wall of insulating passageway (330) constitutes the cavity that is used for holding binding post (310), and the other end of heat-conducting element (200) inserts insulating passageway (330) and binding post (310) contact cooperation.

4. The temperature measuring structure of the switching apparatus according to claim 2, wherein: the switch comprises one or more switch electrical appliances (300), when the switch electrical appliances (300) are included, the switch electrical appliances (300) are arranged side by side along the thickness direction of the switch electrical appliances (300), and the insulation channels (330) of the switch electrical appliances (300) are coaxially arranged.

5. The temperature measuring structure of the switching apparatus according to claim 4, wherein: one end of an insulation channel (330) of the switch electric appliance (300) is protruded to form an insertion block (331), and the other end of the insulation channel (330) is sunken to form an insertion groove (332) matched with the insertion block (331) and used for being matched with the adjacent switch electric appliance.

6. The temperature measuring structure of the switching apparatus according to claim 2, wherein: the switch cabinet comprises a plurality of switch electric appliances (300), wherein the switch electric appliances (300) are arranged side by side along the thickness direction of the switch electric appliances (300), the switch electric appliances (300) comprise a first switch electric appliance (300A) and at least one second switch electric appliance (300B), and the at least one second switch electric appliance (300B) is arranged between the first switch electric appliance (300A) and a first shell (100); the insulation channel (330) of the second switch electric appliance (300B) is of a through hole structure, the insulation channel (330) of the first switch electric appliance (300A) is of a counter bore structure, and the heat conduction element (200) penetrates through at least one second switch electric appliance (300B) and then is inserted into the counter bore structure of the first switch electric appliance (300A).

7. The temperature measuring structure of the switching apparatus according to claim 4, wherein: the switch electric appliance (300) is respectively provided with a wiring terminal (310) corresponding to a wire inlet end and a wiring terminal (310) corresponding to a wire outlet end, the temperature measuring unit comprises two heat conducting elements (200), one heat conducting element (200) is matched with the wiring terminal (310) corresponding to the wire inlet end of the switch electric appliance (300), and the other heat conducting element (200) is matched with the wiring terminal (310) corresponding to the wire outlet end of the switch electric appliance (300).

8. The temperature measuring structure of the switching apparatus according to claim 1, wherein: the circuit board (110) further comprises a driving circuit (130), and the driving circuit (130) is connected with an operating mechanism of the switching device (300).

9. The temperature measuring structure of the switching apparatus according to claim 1, wherein: the heat conducting element (200) comprises a transmission part (210) and a sensing part (220) which are vertically connected, the transmission part (210) is inserted into the switch electric appliance (300), and the sensing part (220) is arranged opposite to the temperature sensor (120).

10. The temperature measuring structure of the switching apparatus according to claim 3, wherein: the wiring terminal (310) comprises a wiring board, a wiring frame (311) and a wiring screw, the wiring board comprises a limiting part (312) and a wire pressing part (313) connected with the limiting part (312), and the wiring frame (311) is sleeved on the wire pressing part (313); the heat conducting element (200) is a copper sheet, the heat conducting element (200) is located above the limiting portion (312) of the corresponding wiring terminal (310), and the side face of the heat conducting element (200) is opposite to the wiring frame (311).