Passive built-in temperature measuring circuit breaker and method

Abstract

The application relates to the technical field of circuit breakers, in particular to a passive built-in temperature measuring circuit breaker and a method, which comprises a moving contact and a static contact matched with the moving contact, further comprises a driving rod connected with the moving contact through multiple groups of elastic structures, the driving rod is connected with an operating mechanism of the circuit breaker, the operating mechanism can drive the driving rod to drive the moving contact to move towards the static contact, and the driving rod and the moving contact move relatively after the moving contact contacts the static contact; in the closing process, the moving contact and the static contact are connected first, and then the arc-shaped contact piece contacts the moving contact, while in the opening process, the arc-shaped contact piece and the moving contact are separated first, and then the moving contact and the static contact are separated, so that the electric arc generated between the moving contact and the static contact in the closing and opening processes can be effectively avoided from interfering with the temperature measuring function, the stability of temperature-related signal acquisition and transmission is ensured, and the problem of false early warning is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field related to circuit breakers, and in particular to a passive built-in temperature measuring circuit breaker and method. Background Art

[0002] Passive internal temperature-sensing circuit breakers utilize a thermistor (such as a sensor) placed near the contacts within the arc extinguishing chamber. Temperature is measured based on changes in resistance or thermoelectric potential caused by temperature changes, without relying on an external power source. This allows for timely contact temperature monitoring, preventing overheating failures and ensuring the safe and reliable operation of the circuit breaker and power system. When an abnormal temperature rise occurs within the circuit breaker, such as an increase in contact resistance leading to a temperature rise, the passive internal temperature-sensing device can quickly detect the temperature change and issue a timely warning signal. Most circuit breaker failures are closely related to the contact system, such as contact wear, poor contact, and arc erosion. These issues often leave visible marks on the moving contacts and cause abnormal temperature rises. By monitoring the moving contact temperature, these potential fault indicators can be detected promptly.

[0003] Temperature measurement methods generally include non-contact and contact methods. The non-contact method places the sensor near the moving contact, rather than directly in contact with it. The sensor is spaced a certain distance from the moving contact, forcing heat to radiate from the surface of the moving contact to the surrounding space before being conducted to the sensor. Thermal resistance and energy loss occur during both thermal radiation and air conduction, causing the sensor to take longer to receive heat and generate a temperature change, resulting in slower response. Furthermore, the greater the distance between the sensor and the moving contact, the more pronounced the attenuation of the thermal radiation energy during transmission, which can lead to errors in the temperature measurement results. In actual circuit breaker operation, contact temperature measurement, by placing the sensor in direct contact with the moving contact, allows for relatively timely and efficient temperature monitoring. However, the high temperature and strong electromagnetic field characteristics of the arc during circuit breaker opening and closing can easily cause electromagnetic interference to the temperature measurement module, leading to unstable signal acquisition and transmission, inaccurate data, and potentially false alarms. Furthermore, the instantaneous high temperatures and charged particles caused by the arc can affect or damage the contact temperature measurement structure, resulting in inaccurate temperature measurements and a shortened service life. Summary of the Invention

[0004] The object of the present invention is to provide a passive built-in temperature measuring circuit breaker and method to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a passive built-in temperature-measuring circuit breaker, comprising a moving contact and a static contact adapted to the moving contact, and further comprising: a driving rod connected to the moving contact via multiple sets of elastic structures, the driving rod being connected to an operating mechanism of the circuit breaker, the operating mechanism being capable of driving the driving rod to move the moving contact toward the static contact, and when the moving contact contacts the static contact, the driving rod and the moving contact undergo relative movement; a plurality of arc-shaped contact pieces, equidistantly distributed along the circumference of the moving contact, adapted to the moving contact, and each connected to a set of boosting mechanisms, the boosting mechanisms being triggered when the driving rod and the moving contact undergo relative movement, driving the plurality of arc-shaped contact pieces to perform a closing action and contact the moving contact; the arc-shaped contact pieces are also connected to a temperature-measuring mechanism.

[0006] As a further solution of the present invention, the central axes of the driving rod, the moving contact and the static contact coincide with each other, and when the driving rod and the moving contact move relative to each other, the plurality of arc-shaped contact pieces move radially along the moving contact.

[0007] As a further solution of the present invention: after the plurality of arc-shaped contact pieces are switched from an open state to a closed state, a ring structure can be formed, and the moving contact is enclosed inside.

[0008] As a further solution of the present invention: a first protrusion and a second protrusion are respectively formed on the driving rod and the moving contact, the elastic structure includes a vertical rod fixed on the first protrusion and a first spring sleeved on the outer circumference of the vertical rod, and the vertical rod is slidingly connected to the second protrusion, and the two ends of the first spring are respectively connected to the first protrusion and the second protrusion.

[0009] As a further solution of the present invention: the boosting mechanism includes a sliding structure connecting the vertical rod and a telescopic structure connecting the sliding structure and the arc-shaped contact piece. The vertical rod can drive the arc-shaped contact piece to move radially along the moving contact through the sliding structure and the telescopic structure.

[0010] As a further solution of the present invention: the sliding structure includes a guide plate fixed to the moving contact, the guide plate is provided with a guide groove, a slider is slidably engaged in the guide groove, the bottom of the slider is hinged with a connecting rod, and the connecting rod is hinged to the horizontal arm fixed on the vertical pole, and the telescopic structure is installed on the upper part of the slider.

[0011] As a further further scheme of the present application: the telescopic structure comprises a guide cylinder fixed to the upper part of the slider and a telescopic rod slidingly sleeved with the guide cylinder, the guide cylinder is internally provided with a second spring, one end of the second spring is connected with the first end of the telescopic rod, the other end is connected with the inner wall of the guide cylinder, and the tail end of the telescopic rod is fixedly connected with the arc-shaped contact piece.

[0012] As a further further scheme of the present application: the temperature measuring mechanism comprises a ring body and a sensor installed on the ring body, and further comprises a conduction structure arranged between the arc-shaped contact piece and the sensor; the conduction structure comprises a first heat-conducting piece fixed to the sensor, the first heat-conducting piece is connected with the arc-shaped contact piece through a sliding connecting piece, and the first heat-conducting piece is provided with a sliding groove.

[0013] As a further further scheme of the present application: the sliding connecting piece comprises a second heat-conducting piece slidingly arranged in the sliding groove and capable of sliding up and down relative to the first heat-conducting piece, and a third heat-conducting piece slidingly sleeved with the second heat-conducting piece, the third heat-conducting piece is fixed with the arc-shaped contact piece.

[0014] A temperature measuring method of the passive built-in temperature measuring circuit breaker, when the closing, the moving contact is butt jointed with the static contact, the moving contact and the driving rod are relatively moved, and the boosting mechanism is triggered, the boosting mechanism drives the arc-shaped contact pieces to perform the closing action and contact with the moving contact, and the sensor measures the temperature of the moving contact through the conduction structure and the arc-shaped contact piece.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the present application arranges a plurality of arc-shaped contact pieces adapted to the moving contact around the moving contact. During the closing process, the moving contact is first connected to the static contact to conduct the circuit, and then the relative movement between the driving rod and the moving contact is utilized to enable the boosting mechanism to drive the plurality of arc-shaped contact pieces to close, and the arc-shaped contact pieces are in contact with the moving contact, so that the temperature measuring mechanism can effectively measure the temperature using the arc-shaped contact pieces. On the contrary, during the opening process, the driving rod and the moving contact first move relative to each other, so that the boosting mechanism drives the plurality of arc-shaped contact pieces to open, and the arc-shaped contact pieces are separated from the moving contact, and then the moving contact is separated from the static contact. Therefore, during the closing process, the moving contact and the static contact are connected first, and the arc-shaped contact pieces are in contact with the moving contact later. However, during the opening process, The arc contact is separated from the moving contact first, and the moving contact is separated from the static contact later, which can effectively avoid the arc generated between the moving contact and the static contact during the closing and opening process to interfere with the temperature measurement function, ensure the stability of temperature-related signal acquisition and transmission, avoid false alarm problems, and at the same time prevent the arc from burning the temperature measuring arc contact structure, thereby improving the service life of the temperature measuring mechanism and ensuring the accuracy of temperature measurement; in addition, since multiple arc contacts have the function of performing opening and closing actions, each time the circuit is opened, multiple arc contacts open and separate from the moving contact, which can avoid long-term contact between the arc contacts and the moving contact, and can effectively cut off the continuous transfer of heat to the arc contacts, so that the arc contacts have the opportunity to dissipate heat, avoid excessive accumulation of heat in the arc contacts, and reduce the risk of damage to the arc contacts due to overheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of an embodiment of a passive built-in temperature measuring circuit breaker;

[0017] Figure 2 This is a schematic diagram of the connection between the temperature measuring mechanism and the arc-shaped contact piece in one embodiment of a passive built-in temperature measuring circuit breaker;

[0018] Figure 3 This is a schematic diagram of the connection between the arc-shaped contact piece and the boosting mechanism in one embodiment of a passive built-in temperature measuring circuit breaker;

[0019] Figure 4 This is a structural schematic diagram of an elastic structure in an embodiment of a passive built-in temperature measuring circuit breaker;

[0020] Figure 5 This is a schematic diagram of a closed state of multiple arc-shaped contacts in one embodiment of a passive built-in temperature measuring circuit breaker;

[0021] Figure 6 This is an exploded diagram of the structure of the boosting mechanism in one embodiment of a passive built-in temperature measuring circuit breaker;

[0022] Figure 7 for Figure 6Schematic diagram of the structure from another angle.

[0023] In the figure: 1. moving contact; 2. static contact; 3. driving rod; 4. first protrusion; 5. second protrusion; 6. vertical rod; 7. first spring; 8. cross arm; 9. guide plate; 10. slider; 11. connecting rod; 12. second spring; 13. arc-shaped contact piece; 14. guide cylinder; 15. telescopic rod; 16. ring body; 17. sensor; 18. first heat-conducting member; 19. second heat-conducting member; 20. third heat-conducting member. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0026] See also Figure 1-Figure 7 In an embodiment of the present invention, a passive built-in temperature measuring circuit breaker includes a moving contact 1 and a static contact 2 adapted to the moving contact 1, and also includes: a driving rod 3 connected to the moving contact 1 through multiple groups of elastic structures, the driving rod 3 is connected to the operating mechanism of the circuit breaker, the operating mechanism can drive the driving rod 3 to drive the moving contact 1 toward the static contact 2, when the moving contact 1 contacts the static contact 2, the driving rod 3 and the moving contact 1 move relative to each other; a plurality of arc-shaped contact pieces 13 are equidistantly distributed along the circumference of the moving contact 1, adapted to the moving contact 1, and each is connected to a group of boosting mechanisms, the boosting mechanisms are triggered when the driving rod 3 and the moving contact 1 move relative to each other, driving the plurality of arc-shaped contact pieces 13 to perform a closing action and contact the moving contact 1; the arc-shaped contact pieces 13 are also connected to a temperature measuring mechanism.

[0027] The circuit breaker further includes conventional structures that are mature in the prior art, such as a housing, an arc extinguishing chamber, and other basic installation components.

[0028] It should be noted that the operating mechanism, i.e., the mechanism that controls the opening and closing actions of the circuit breaker, is also called the "operating mechanism". It is an important component of the circuit breaker. Its main function is to realize the opening and closing operations of the circuit breaker by storing and releasing energy. As for its specific working principle, this application will not go into details. In this application, when closing the circuit, the operating mechanism can drive the driving rod 3 to rise. Accordingly, the driving rod 3 drives the moving contact 1 to rise through the elastic structure, so that the moving contact 1 approaches the static contact 2. Furthermore, the closing process is divided into two stages: in the first stage, the driving rod 3 drives the moving contact 1 to start rising until The moving contact 1 is in contact with the static contact 2. During this stage, the moving contact 1 and the driving rod 3 do not move relative to each other, and the two remain relatively stationary. At this time, the circuit is conductive. In the second stage, the driving rod 3 continues to rise. The moving contact 1 is in contact with the static contact 2, so that the moving contact 1 remains stationary. The driving rod 3 and the moving contact 1 move relative to each other. The elastic structure prompts the boosting mechanism to move. The boosting mechanism causes the multiple arc-shaped contact pieces 13 to perform a closing action until the arc-shaped contact pieces 13 are in close contact with the moving contact 1, so that the temperature measuring mechanism can perform effective temperature measurement through the arc-shaped contact pieces 13 during the operation of the circuit breaker.

[0029] It should be noted that, in the present application, a plurality of arc-shaped contact pieces 13 adapted to the moving contact 1 are provided around the moving contact 1. During the closing process, the moving contact 1 is first connected to the static contact 2 to conduct the circuit. Then, the relative movement between the driving rod 3 and the moving contact 1 is utilized to enable the boosting mechanism to drive the plurality of arc-shaped contact pieces 13 to perform the closing action. The arc-shaped contact pieces 13 contact the moving contact 1, thereby enabling the temperature measuring mechanism to effectively measure the temperature using the arc-shaped contact pieces 13. On the contrary, during the opening process, the driving rod 3 and the moving contact 1 first undergo relative movement. The boosting mechanism drives multiple arc-shaped contact pieces 13 to perform the opening action, and the arc-shaped contact pieces 13 are separated from the moving contact 1, and then the moving contact 1 is separated from the static contact 2; therefore, during the closing process, the moving contact 1 and the static contact 2 are connected first, and the arc-shaped contact pieces 13 are in contact with the moving contact 1 later, while during the opening process, the arc-shaped contact pieces 13 are separated from the moving contact 1 first, and the moving contact 1 and the static contact 2 are separated later, thereby effectively avoiding the adverse effects of the arc generated between the moving contact 1 and the static contact 2 on the temperature measurement results during the closing and opening processes.

[0030] In addition, multiple arc-shaped contact pieces 13 equidistantly distributed along the circumference can form multiple contact points with the surface of the moving contact 1, which can more comprehensively obtain the temperature information of the surface of the moving contact 1, avoid errors caused by single-point measurement, improve the accuracy and reliability of temperature measurement, and form a redundant temperature measurement mechanism.

[0031] Secondly, compared with the single-point measurement method, since multiple arc-shaped contact pieces 13 achieve contact with the moving contact 1 through a closing action (similar to applying a certain clamping force to the moving contact 1), the multi-point contact method of multiple arc-shaped contact pieces 13 enhances the connection stability with the moving contact 1 to a certain extent, and can reduce the loosening or position deviation of the temperature measuring components caused by factors such as equipment vibration, thereby improving the stability of temperature measurement.

[0032] Please refer again Figure 4 The central axes of the driving rod 3, the moving contact 1 and the static contact 2 coincide with each other. When the driving rod 3 and the moving contact 1 move relative to each other, the multiple arc-shaped contact pieces 13 move radially along the moving contact 1.

[0033] After the plurality of arc-shaped contact pieces 13 are switched from an open state to a closed state, a ring structure can be formed, and the moving contact 1 is enclosed inside.

[0034] Since the multiple arc-shaped contact pieces 13 can perform opening and closing actions, each time the circuit breaker is opened, the multiple arc-shaped contact pieces 13 open and separate from the moving contact 1. On the one hand, this can avoid the adverse effects on temperature measurement caused by the generation of electric arcs. On the other hand, it can avoid long-term contact between the arc-shaped contact pieces 13 and the moving contact 1, effectively cutting off the continuous transfer of heat to the arc-shaped contact pieces 13, giving the arc-shaped contact pieces 13 an opportunity to dissipate heat, avoiding excessive accumulation of heat in the arc-shaped contact pieces 13, and reducing the risk of damage to the arc-shaped contact pieces 13 due to overheating.

[0035] Please refer again Figure 4 A first protrusion 4 and a second protrusion 5 are respectively formed on the driving rod 3 and the moving contact 1. The elastic structure includes a vertical rod 6 fixed on the first protrusion 4 and a first spring 7 sleeved on the outer periphery of the vertical rod 6. The vertical rod 6 is slidingly connected to the second protrusion 5, and the two ends of the first spring 7 are respectively connected to the first protrusion 4 and the second protrusion 5.

[0036] In the second stage of closing, as the driving rod 3 continues to move upward, the vertical rod 6 will slide relative to the second protrusion 5, the distance between the first protrusion 4 and the second protrusion 5 will be shortened, and the first spring 7 will be gradually compressed. During this process, the vertical rod 6 will drive the boosting mechanism to move, causing the multiple arc-shaped contact pieces 13 to perform the closing action.

[0037] Please refer again Figure 2 、 Figure 3 、 Figure 6 as well as Figure 7, the boosting mechanism comprises a sliding structure connected with the vertical rod 6 and a telescopic structure connected with the sliding structure and the arc-shaped contact piece 13, the vertical rod 6 can drive the arc-shaped contact piece 13 to move along the radial direction of the movable contact 1 through the sliding structure and the telescopic structure. The sliding structure comprises a guide plate 9 fixed with the movable contact 1, the guide plate 9 is provided with a guide groove, a sliding block 10 is slidably embedded in the guide groove, the bottom of the sliding block 10 is hingedly connected with a connecting rod 11, and the connecting rod 11 is hingedly connected with a cross arm 8 fixed on the vertical rod 6, and the telescopic structure is installed on the upper part of the sliding block 10.

[0038] In the second stage of closing, when the movable contact 1 and the driving rod 3 move relatively, the vertical rod 6 and the cross arm 8 push the sliding block 10 to move along the length direction of the guide plate 9 (i.e. the radial direction of the movable contact 1) through the connecting rod 11, and then the sliding block 10 slides close to the movable contact 1, so that the arc-shaped contact pieces 13 perform closing action and contact the movable contact 1 to start temperature measurement, realizing the effect that the movable contact 1 and the static contact 2 are connected first and then the arc-shaped contact pieces 13 contact the movable contact 1. In the opening process, the first spring 7 rebounds to make the movable contact 1 and the driving rod 3 move relatively again (in the opposite direction of the closing process), and then the cross arm 8 pulls the sliding block 10 to slide away from the movable contact 1 through the connecting rod 11 until the arc-shaped contact pieces 13 are separated from the movable contact 1, realizing the effect that the arc-shaped contact pieces 13 are separated from the movable contact 1 first and then the movable contact 1 and the static contact 2 are separated.

[0039] The telescopic structure comprises a guide cylinder 14 fixed on the upper part of the sliding block 10 and a telescopic rod 15 slidably sleeved with the guide cylinder 14, the guide cylinder 14 is provided with a second spring 12, one end of the second spring 12 is connected with the first end of the telescopic rod 15, the other end is connected with the inner wall of the guide cylinder 14, and the tail end of the telescopic rod 15 is fixedly connected with the arc-shaped contact piece 13.

[0040] In detail, when the sliding block 10 slides on the guide plate 9 close to the movable contact 1, after the arc-shaped contact pieces 13 contact the movable contact 1, with the continuous sliding of the sliding block 10, the telescopic rod 15 slides relatively with the guide cylinder 14, the second spring 12 is compressed, and then under the elastic supporting force of the second spring 12, the arc-shaped contact pieces 13 and the movable contact 1 can be effectively maintained in close contact during temperature measurement, which provides guarantee for accurate temperature measurement and reduces the problems of loosening or position deviation caused by vibration during closing and opening, thereby improving the stability of temperature measurement function.

[0041] Please refer to Figure 5-Figure 7The temperature measuring mechanism includes a ring body 16 and a sensor 17 installed on the ring body 16, and also includes a conductive structure arranged between the arc-shaped contact piece 13 and the sensor 17; the conductive structure includes a first heat-conducting member 18 fixed on the sensor 17, the first heat-conducting member 18 is connected to the arc-shaped contact piece 13 through a sliding connection, and the first heat-conducting member 18 is provided with a slide groove.

[0042] The sliding connection member includes a second heat conducting member 19 slidably disposed in the sliding groove and capable of sliding up and down relative to the first heat conducting member 18 , and a third heat conducting member 20 slidably fitted with the second heat conducting member 19 . The third heat conducting member 20 is fixed to the arc-shaped contact piece 13 .

[0043] Furthermore, when the temperature of the moving contact 1 rises, the temperature will be transferred to the first heat conducting member 18 through the third heat conducting member 20 and the second heat conducting member 19 in sequence, and the sensor 17 is used to monitor the temperature of the first heat conducting member 18 in real time to reflect the temperature of the moving contact 1 and realize the temperature measurement function; when the moving contact 1 and the arc-shaped contact piece 13 are displaced in the vertical direction, the second heat conducting member 19 will slide relative to the first heat conducting member 18, and when the multiple arc-shaped contacts 13 are performing expansion or closing actions, the second heat conducting member 19 will slide relative to the third heat conducting member 20, so that the sensor 17 can smoothly perform temperature monitoring under the premise that the arc-shaped contacts 13 can move normally; it should be emphasized that the arc-shaped contacts 13, the first heat conducting member 18, the second heat conducting member 19 and the third heat conducting member 20 need to be made of suitable heat-conducting materials. This application does not make specific restrictions on this. In the specific implementation, it is necessary to ensure that there is a sufficiently large contact surface between each other to ensure heat transfer efficiency and improve temperature measurement accuracy.

[0044] Further, the purpose of the conductive structure is to fix the position of the sensor 17, fix the connection line between the power supply and the signal processing device and shorten the distance, reduce the line loss in the process of power transmission, and the wiring of the sensor 17 can be optimized to be away from the strong electromagnetic field area, reduce the influence of electromagnetic interference on power transmission and signal, and at the same time, it can also ensure that the sensor 17 is in a proper energy acquisition position to ensure energy acquisition efficiency. Of course, the conductive structure can also be replaced by a flexible heat-conducting sheet, but the bending direction and shape of the flexible heat-conducting sheet may change during the movement of the arc-shaped contact piece 13, which may cause changes in heat conduction performance, resulting in unstable temperature measurement. The first heat-conducting piece 18, the second heat-conducting piece 19 and the third heat-conducting piece 20 are arranged between the arc-shaped contact piece 13 and the sensor 17, and the heat conduction effect is guaranteed under the premise of reasonable selection of materials and effective control of heat conduction area. Compared with the flexible heat-conducting sheet, the stability of each bending action is better, and the heat conduction performance does not change, thereby ensuring the stability and accuracy of temperature measurement.

[0045] As another embodiment of the application, a temperature measurement method of the passive built-in temperature measurement circuit breaker is also proposed. When the moving contact 1 is connected with the static contact 2, the moving contact 1 moves relative to the driving rod 3 and triggers the boost mechanism, which drives the multiple arc-shaped contact pieces 13 to perform the folding action and contact with the moving contact 1. The sensor 17 measures the temperature of the moving contact 1 through the conductive structure and the arc-shaped contact piece 13.

[0046] It is apparent for those skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, and the application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be considered as exemplary and non-limiting, and the scope of the application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the application. Any reference signs in the claims should not be considered as limiting the claims involved.

[0047] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A passive built-in temperature measuring circuit breaker, comprising a moving contact and a stationary contact adapted to the moving contact; characterized in that: Also includes: A driving rod connected to the moving contact through multiple sets of elastic structures, the driving rod is connected to the operating mechanism of the circuit breaker, and the operating mechanism can drive the driving rod to drive the moving contact to move toward the static contact. When the moving contact contacts the static contact, the driving rod and the moving contact move relative to each other; a plurality of arc-shaped contact pieces are equidistantly distributed along the circumference of the moving contact, adapted to the moving contact, and each is connected to a group of boosting mechanisms, which are triggered when the driving rod and the moving contact move relative to each other, driving the plurality of arc-shaped contact pieces to perform a closing action and contact the moving contact; the arc-shaped contact pieces are also connected to Temperature measuring mechanism; a first protrusion and a second protrusion are respectively formed on the driving rod and the moving contact, the elastic structure includes a vertical rod fixed on the first protrusion and a first spring sleeved on the outer circumference of the vertical rod, and the vertical rod is slidably connected to the second protrusion, and the two ends of the first spring are respectively connected to the first protrusion and the second protrusion; the boosting mechanism includes a sliding structure connecting the vertical rod and a telescopic structure connecting the sliding structure and the arc-shaped contact piece, and the vertical rod can drive the arc-shaped contact piece to move radially along the moving contact through the sliding structure and the telescopic structure.

2. A passive built-in temperature measuring circuit breaker according to claim 1, characterized in that: The central axes of the driving rod, the moving contact and the static contact coincide with each other. When the driving rod and the moving contact move relative to each other, the plurality of arc-shaped contact pieces move in a radial direction of the moving contact.

3. The passive built-in temperature measuring circuit breaker according to claim 1, characterized in that: After the plurality of arc-shaped contact pieces are switched from an open state to a closed state, a ring structure can be formed, and the moving contact is enclosed inside.

4. The passive built-in temperature measuring circuit breaker according to claim 1, characterized in that: The sliding structure includes a guide plate fixed to the moving contact, a guide groove is provided on the guide plate, a slider is slidably engaged in the guide groove, a connecting rod is hinged at the bottom of the slider, and the connecting rod is hinged to the horizontal arm fixed to the vertical pole, and the telescopic structure is installed on the upper part of the slider.

5. The passive built-in temperature measuring circuit breaker according to claim 4, characterized in that: The telescopic structure includes a guide cylinder fixed to the upper part of the slider and a telescopic rod slidably fitted with the guide cylinder. A second spring is provided in the guide cylinder, one end of the second spring is connected to the head end of the telescopic rod, and the other end is connected to the inner wall of the guide cylinder. The tail end of the telescopic rod is fixedly connected to the arc-shaped contact piece.

6. The passive built-in temperature measuring circuit breaker according to claim 1, characterized in that: The temperature measuring mechanism includes a ring body and a sensor mounted on the ring body, and also includes a conductive structure arranged between the arc-shaped contact piece and the sensor; the conductive structure includes a first heat-conducting member fixed on the sensor, the first heat-conducting member is connected to the arc-shaped contact piece through a sliding connection, and the first heat-conducting member is provided with a sliding groove.

7. The passive built-in temperature measuring circuit breaker according to claim 6, characterized in that: The sliding connection member includes a second heat conducting member slidably disposed in the sliding groove and capable of sliding up and down relative to the first heat conducting member, and a third heat conducting member slidably fitted with the second heat conducting member, wherein the third heat conducting member is fixed to the arc-shaped contact piece.

8. A temperature measurement method for a passive built-in temperature measurement circuit breaker according to claim 1, characterized in that: When closing the circuit breaker, after the moving contact and the static contact are docked, the moving contact and the driving rod move relative to each other, prompting the booster mechanism to be triggered. The booster mechanism drives multiple arc-shaped contact pieces to perform the closing action and contact the moving contact. The sensor measures the temperature of the moving contact through the conductive structure and the arc-shaped contact pieces.

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