A circuit breaker

Abstract

The utility model relates to a kind of circuit breaker, belong to switch electric appliance technical field.It include shell, terminal and temperature measuring component, the terminal is arranged in shell, the temperature measuring component is arranged below the terminal and is attached with terminal, the temperature measuring component includes insulating shell, characterized by: at least one mounting portion is provided on the terminal, the insulating shell is equipped with the fixed portion corresponding with mounting portion towards mounting portion side, and the fixed portion is fixed in mounting portion.Advantages: since being provided with the limiting slot for limiting temperature measuring component on shell, thus provides installation condition for temperature measuring component, since overall structure is very compact and concise, thus can avoid occupying space or generating interference influence to other parts.

Description

Technical Field

[0001] This utility model belongs to the field of switchgear technology, specifically relating to a circuit breaker. Background Technology

[0002] Circuit breakers are used in power distribution systems to distribute electrical energy and protect circuits. The contact condition at the terminals of molded case circuit breakers, such as the screw tightening torque, significantly affects the temperature rise of the terminals, especially for molded case circuit breakers with higher rated current. Poor contact can cause the internal temperature of the circuit breaker to be too high, easily leading to overload tripping. In severe cases, it can cause damage to the terminals and internal components, rendering the circuit breaker unusable and even causing circuit burnout. The essence of the aforementioned terminal temperature rise is the uncontrolled increase in contact resistance, leading to an increase in the Joule thermal index and causing local thermal collapse. In kilovolt-level voltages, a seemingly insignificant loose screw can often pose a catastrophic risk. IEC 60947-1's mandatory requirement for terminal temperature rise testing may be due to safety considerations, including the aforementioned factors. Based on the above, continuous real-time monitoring of terminal temperature to detect abnormal temperature rises and prevent thermal runaway accidents caused by poor contact, abnormal torque, etc., is of positive significance. Utility Model Content

[0003] The objective of this invention is to provide a circuit breaker that facilitates continuous, accurate, and reliable real-time monitoring of terminal temperature in an intelligent manner, thereby preventing thermal runaway accidents caused by factors such as poor contact and abnormal torque, and that helps maintain the simplicity and compactness of the structure, thus avoiding space occupation or interference with other components.

[0004] The present invention accomplishes its objective as follows: a circuit breaker includes a housing, terminals, and a temperature measuring component. The terminals are disposed within the housing, and the temperature measuring component is disposed below and in contact with the terminals. The temperature measuring component includes an insulating outer shell. The key feature is that at least one mounting portion is provided on the terminals, and the insulating outer shell has a fixing portion adapted to the mounting portion on the side facing the mounting portion, and the fixing portion is fixed within the mounting portion.

[0005] Preferably, the temperature measuring component further includes a temperature measuring probe and a connecting wire. The temperature measuring probe is installed inside an insulating housing. One end of the connecting wire is connected to the temperature measuring probe, and the other end of the connecting wire is connected to a processing unit for acquiring the temperature data of the terminal block and implementing an alarm and / or cutting off the power supply to the circuit breaker when the temperature data is abnormal.

[0006] Preferably, the insulating shell includes a body, inside which a cavity is formed, the temperature probe is installed in the cavity, and the fixing part is disposed on the side of the body facing the mounting part, the fixing part being inserted and fixed to the mounting part.

[0007] Preferably, the mounting portion is a hole or boss formed on the terminal block, and the fixing portion is a flange or boss cavity formed on the body of the insulating housing and corresponding to the hole and the boss respectively, forming a mutually compensating relationship.

[0008] Preferably, when the mounting part is a hole, the fixing part is a flange, and when the mounting part is a boss, the fixing part is a boss cavity; the number of holes or bosses is adapted to the number of flanges or boss cavities, and the number of flanges or boss cavities is one or more.

[0009] Preferably, the temperature probe is interference-fitted with the cavity.

[0010] Preferably, the insulating shell is made of an insulating material, such as elastic rubber or silicone, and the temperature probe is a thermistor or thermocouple.

[0011] Preferably, the insulating shell has a rectangular cross-sectional shape.

[0012] Preferably, a limiting groove is provided on the housing and at the corresponding temperature measuring component position, and the temperature measuring component is limited by the limiting groove after being installed on the circuit breaker.

[0013] The technical solution provided by this utility model provides installation conditions for the temperature measuring component by setting a limiting groove on the housing for limiting the position of the temperature measuring component. After the temperature measuring component is installed in the housing, it is limited by the cooperation between the terminal and the limiting groove, which helps the temperature measuring component to continuously, accurately and reliably monitor the temperature of the terminal in a smart way, thereby avoiding thermal runaway accidents caused by factors such as poor contact and abnormal torque. Since the overall structure is very compact and simple, it avoids occupying space or interfering with other parts. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the assembly structure of this utility model; Figure 2 for Figure 1 A schematic diagram of the assembled assembly; Figure 3 for Figure 1 and Figure 2 The diagram shows the assembly of the temperature measuring component and the wiring terminals. Detailed Implementation

[0015] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this invention should be considered within the scope of protection of this invention.

[0016] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0017] Please see Figure 1 and Figure 2 The diagram shows a housing 1, a terminal block 2, and a temperature measuring component 3. The terminal block 2 is disposed inside the housing 1, and the temperature measuring component 3 is disposed below and attached to the terminal block 2. The temperature measuring component 3 includes an insulating shell 31. The terminal block 2 is provided with at least one mounting portion 21, and the insulating shell 31 is provided with a fixing portion 313 adapted to the mounting portion 21 on the side facing the mounting portion 21. The fixing portion 313 is fixed inside the mounting portion 21.

[0018] Please see Figure 3 A mounting part 21 is provided on the aforementioned terminal 2, and the aforementioned temperature measuring component 3 is installed on the downward-facing side of the terminal 2 at the position corresponding to the mounting part 21.

[0019] Depend on Figure 1 and Figure 3 As shown, in this embodiment, the aforementioned temperature measuring component 3 for measuring the temperature of the terminal 2 is arranged horizontally below the terminal 2. This arrangement is based on the premise that there is a pair of mounting parts 21, which will be mentioned below. Furthermore, it takes into account that horizontally mounting the temperature measuring component 3 can reduce or shorten the heat transfer path between it and the terminal 2, so as to ensure the accuracy and timeliness of the temperature measurement of the terminal 2.

[0020] Please pay attention. Figure 3 And combined Figure 1 The aforementioned temperature measuring component 3 includes an insulating housing 31, a temperature measuring probe 32, and a connecting wire 33. The temperature measuring probe 32 is installed inside the insulating housing 31. One end of the connecting wire 33 is connected to the temperature measuring probe 32, and the other end of the connecting wire 33 is connected to a processing unit 4 for acquiring the temperature data of the aforementioned terminal 2 and for implementing an alarm and / or cutting off the power supply of the aforementioned circuit breaker when the temperature data is abnormal. Figure 1 (Show) connection.

[0021] See you later Figure 3 The aforementioned insulating shell 31 includes a body 311, inside which a cavity 312 is formed. The aforementioned temperature probe 32 is installed in the cavity 312. The body 311 is provided with a fixing part 313 adapted to the aforementioned mounting part 21 on the side facing the aforementioned terminal 2. The fixing part 313 is inserted and fixed to the mounting part 21.

[0022] The aforementioned mounting portion 21 is a hole or boss formed on the aforementioned terminal 2, and the aforementioned fixing portion 313 is a flange or boss cavity (also called a groove or hole) formed on the body 311 of the aforementioned insulating housing 31 and corresponding to the aforementioned hole and boss respectively, forming a mutually compensating relationship. In this embodiment, the latter is chosen, that is, a hole and a pair of holes serve as the mounting portion 21, and correspondingly, a flange and a pair of flanges 313 serve as the fixing portion. In this embodiment, the hole serving as the mounting portion 21 is a blind hole, and the size of the blind hole is slightly smaller than the size of the flange, thereby forming an interference fit between the temperature sensing element 3 and the terminal 2, ensuring reliable fixation between the temperature sensing element 3 and the terminal 2. Conversely, if the hole is changed to a boss, and the flange is changed to a boss cavity accordingly, then the boss cavity is also in the form of a blind hole, and the two, namely the boss cavity and the boss, form an interference fit.

[0023] In this embodiment, the aforementioned temperature probe 32 is fixed to the cavity 312 by thermally conductive adhesive. The thermally conductive adhesive can be thermally conductive epoxy adhesive or thermally conductive silicone adhesive. The thermally conductive adhesive can fill the gap between the temperature probe 32 and the adhesive 312 and form a heat transfer path with high efficiency, so as to improve the heat exchange speed between the terminal 2 and the temperature measuring component 3, thereby ensuring the timeliness and accuracy of the temperature measurement of the terminal 2 by the temperature measuring component 3.

[0024] As can be seen from the above description: when the aforementioned mounting part 21 is a hole, the aforementioned fixing part 313 is a flange; and when the aforementioned mounting part 21 is a boss, the aforementioned fixing part is a boss cavity. The number of the aforementioned holes or bosses is adapted to the number of the aforementioned flanges or boss cavities. In this embodiment, the number of the aforementioned flanges or boss cavities is multiple, and these multiple are a pair. According to common sense, the aforementioned mounting part 21 can also be one or three, and the corresponding fixing part 31 can also be one or three. However, the applicant needs to clarify that although this embodiment selects a pair of mounting parts 21 and a pair of fixing parts 313, it does not exclude one or three. Therefore, any design that changes the quantity should be considered within the scope of the technical content disclosed in this utility model.

[0025] In this embodiment, the aforementioned temperature probe 32 is interference-fitted with the aforementioned cavity 312.

[0026] The aforementioned insulating shell 31 is made of insulating material, which is elastic rubber, but can also be silicone. The aforementioned temperature probe 32 is a thermistor, but can also be a thermocouple.

[0027] In this embodiment, the cross-sectional shape of the aforementioned insulating shell 31 is rectangular, and thus the aforementioned limiting groove 11 is adapted to the rectangle. The rectangular structure allows the temperature measuring component 3 to fit better with the terminal 2, which is beneficial to improving the reliability of the connection between the temperature measuring component 3 and the terminal 2, and at the same time, it is beneficial to ensure the fitting effect of the temperature measuring component 3 and the limiting groove 11 of the shell 1, that is, to better limit the temperature measuring component 3.

[0028] In this embodiment, and by Figure 1 As shown, a limiting groove 11 is provided on the aforementioned housing 1 at a position corresponding to the temperature measuring component 3. The limiting groove 11 is an embedded groove adapted to the shape of the aforementioned insulating housing 31. After the temperature measuring component 3 is installed on the circuit breaker, it is limited by the limiting groove 11.

[0029] During the service and operation of the circuit breaker, the temperature of terminal 2 is measured by the temperature sensing component 3. Since the connecting wire 33 of the temperature sensing component's structural system is connected to the processing unit 4, the processing unit 4 acquires the temperature data of terminal 2 and alarms and / or controls the circuit breaker to cut off power when the temperature data is abnormal. In other words, when the temperature data of terminal 2 is abnormal, the processing unit 4 issues an alarm, allowing maintenance personnel to promptly detect the abnormal temperature data and reduce line losses caused by overheating of terminal 2. When the temperature data of terminal 2 is abnormal, the processing unit 4 can also control the circuit breaker to cut off power to prevent fires caused by overheating of terminal 2. Of course, when the temperature data of terminal 2 is abnormal, the processing unit 4 can simultaneously issue an alarm and control the circuit breaker to cut off power to improve the circuit breaker's intelligence level and safety performance. Preferably, the processing unit 4 can store the temperature data of terminal 2 and record abnormal temperature data events. The processing unit 4 can also upload abnormal temperature data and issue remote alarms.

[0030] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A circuit breaker, comprising a housing (1), terminals (2), and a temperature sensing component (3), wherein the terminals (2) are disposed within the housing (1), and the temperature sensing component (3) is disposed below and in contact with the terminals (2), the temperature sensing component (3) comprising an insulating outer shell (31), characterized in that: The terminal block (2) is provided with at least one mounting part (21), and the insulating shell (31) is provided with a fixing part (313) adapted to the mounting part (21) on the side facing the mounting part (21), and the fixing part (313) is fixed inside the mounting part (21).

2. A circuit breaker according to claim 1, characterized in that: The temperature measuring component (3) also includes a temperature measuring probe (32) and a connecting wire (33). The temperature measuring probe (32) is installed inside the insulating housing (31). One end of the connecting wire (33) is connected to the temperature measuring probe (32), and the other end of the connecting wire (33) is connected to a processing unit (4) for acquiring the temperature data of the terminal (2) and implementing an alarm and / or cutting off the power supply of the circuit breaker when the temperature data is abnormal.

3. A circuit breaker according to claim 2, characterized in that: The insulating shell (31) includes a body (311) with a cavity (312) inside the body (311). The temperature probe (32) is installed in the cavity (312). The fixing part (313) is located on the side of the body (311) facing the mounting part (21) and is inserted and fixed to the mounting part (21).

4. A circuit breaker according to claim 3, characterized in that: The mounting part (21) is a hole or boss formed on the terminal block (2), and the fixing part (313) is a flange or boss cavity formed on the body (311) of the insulating shell (31) and corresponding to the hole and the boss respectively, forming a mutually compensating relationship.

5. A circuit breaker according to claim 4, characterized in that: When the mounting part (21) is a hole, the fixing part (313) is a flange, and when the mounting part (21) is a boss, the fixing part is a boss cavity; the number of holes or bosses is adapted to the number of flanges or boss cavities, and the number of flanges or boss cavities is one or more.

6. A circuit breaker according to claim 3, characterized in that: The temperature probe (32) is interference-fitted with the cavity (312).

7. A circuit breaker according to claim 2, characterized in that: The insulating shell (31) is made of an insulating material, which is elastic rubber or silicone, and the temperature probe (32) is a thermistor or thermocouple.

8. A circuit breaker according to any one of claims 1 to 7, characterized in that: The insulating shell (31) has a rectangular cross-sectional shape.

9. A circuit breaker according to claim 1, characterized in that: A limiting groove (11) is provided on the housing (1) at the position corresponding to the temperature measuring component (3), and the temperature measuring component (3) is limited by the limiting groove (11) after being installed on the circuit breaker.

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