Closing resistor device and circuit breaker

Abstract

The utility model relates to the technical field of circuit breakers, in particular to a closing resistor device and a circuit breaker. The closing resistor device comprises a first fixed baffle plate, a second fixed baffle plate, a resistor string, a fracture assembling assembly and a second insulating rod. The resistor string comprises a first insulating rod, a movable plate and a plurality of resistor discs; the two ends of the first insulating rod are connected with the first fixed baffle and the second fixed baffle, the first insulating rod is sleeved with the movable plate and the resistor discs, and the movable plate is located between any two resistor discs. One end of the second insulating rod is fixedly connected with the fracture assembling component, and the other end of the second insulating rod penetrates through the movable plate and is movably connected with the second fixed baffle plate; the movable plate can slide in the axial direction of the second insulating rod, and the fracture assembling assembly can drive the second fixed baffle to slide in the axial direction of the second insulating rod. The closing resistor device can improve the stress condition of the resistor disc, reduce or avoid stress concentration, prolong the service life, reduce potential safety hazards and save cost.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a closing resistor device and a circuit breaker. Background Technology

[0002] Currently, closing resistor devices are easily affected by impacts or vibrations during transportation, and there will be certain assembly errors during assembly. In addition, the closing resistor devices will experience certain thermal expansion during the opening and closing operation.

[0003] Based on existing closing resistor devices, during transportation, assembly, and operation (opening and closing), the closing resistor device is prone to wear and cracking of the resistor element due to local stress concentration, which shortens the service life of the closing resistor device, increases safety hazards, and increases costs.

[0004] Therefore, there is an urgent need to design a closing resistor device and circuit breaker to solve the above technical problems. Utility Model Content

[0005] The primary objective of this invention is to provide a closing resistor device that can improve the stress distribution on the resistor element, reduce or avoid stress concentration, extend service life, reduce safety hazards, and save costs.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a closing resistor device, comprising:

[0008] First fixed baffle and second fixed baffle;

[0009] A resistor string, comprising a first insulating rod, a movable plate, and multiple resistive elements; the two ends of the first insulating rod are connected to a first fixed baffle and a second fixed baffle, the movable plate and the resistive elements are both sleeved on the first insulating rod, and the movable plate is located between any two of the resistive elements;

[0010] A fracture assembly assembly, wherein the fixed end of the fracture assembly assembly is connected to the first fixed baffle, and the movable end of the fracture assembly assembly is connected to the second fixed baffle;

[0011] The second insulating rod has one end fixedly connected to the fracture assembly assembly, and the other end of the second insulating rod passes through the movable plate and is movably connected to the second fixed baffle. The movable plate can slide along the axial direction of the second insulating rod, and the movable end of the fracture assembly assembly can drive the second fixed baffle to slide along the axial direction of the second insulating rod.

[0012] As an optional technical solution for the closing resistor device, the resistor string is configured as two, and the first insulating rod and the second insulating rod of the two resistor strings are arranged in a triangular shape.

[0013] As an optional technical solution for the closing resistor device, the movable plate has two first through holes and one second through hole. The first through hole is configured to pass through the first insulating rod, and the second through hole is configured to pass through the second insulating rod.

[0014] As an optional technical solution for the closing resistor device, the movable plate includes an integrally formed first connecting part and a second connecting part, and the first connecting part and the second connecting part are coaxially arranged;

[0015] The first through hole is provided in the first connecting part, and the second through hole is provided in the second connecting part, with the first connecting part and the second connecting part transitioning by an arc.

[0016] As an optional technical solution for the closing resistor device, a first bushing is provided inside the first fixed baffle, a second bushing is provided in the second through hole, the first insulating rod passes through the first bushing, and the second insulating rod passes through the second bushing.

[0017] As an optional technical solution for the closing resistor device, the closing resistor device further includes a connecting plate and a first fixing member. One end of the connecting plate is connected to the break assembly. A third through hole is provided on the connecting plate. The second insulating rod passes through the third through hole. At least two first fixing members are provided. At least two first fixing members are screwed onto the second insulating rod. At least two first fixing members are placed on both sides of the connecting plate and abut against the connecting plate.

[0018] As an optional technical solution for the closing resistor device, the connecting plate is provided with a fourth through hole, and the closing resistor device also includes a second fixing member. One end of the second fixing member passes through the fourth through hole and is connected to the break assembly assembly to fix the connecting plate on the break assembly assembly.

[0019] As an optional technical solution for the closing resistor device, the connecting plate includes an integrally formed third connecting part and a fourth connecting part. The third through hole is disposed in the third connecting part, and the fourth through hole is disposed in the fourth connecting part. The third connecting part and the fourth connecting part are transitioned by a right angle or a rounded corner. The fourth connecting part is arc-shaped on the side facing the break assembly to adapt to the outer peripheral surface of the break assembly.

[0020] As an optional technical solution for the closing resistor device, a fifth through hole is provided on the second fixed baffle, and a third bushing is provided in the fifth through hole, with the end of the second insulating rod away from the connecting plate passing through the third bushing.

[0021] As an optional technical solution for the closing resistor device, the closing resistor device further includes multiple conductive plates, wherein two conductive plates are disposed between two adjacent resistor pieces on a resistor string, each pair of conductive plates extends to the adjacent resistor string, and the two conductive plates are placed on both sides of one resistor piece in the adjacent resistor string, and the two conductive plates are respectively connected to both sides of the resistor piece, so that the resistor pieces on the two resistor strings are connected in series and form a series circuit;

[0022] A first insulating pad is provided between two conductive plates placed between two adjacent resistor pieces on the same resistor string; a second insulating pad is provided between the first fixing baffle and the resistor piece, and / or between the second fixing baffle and the resistor piece.

[0023] As an optional technical solution for the closing resistor device, a first support portion is provided on the first insulating pad, and a second support portion is provided on the second insulating pad. The opposite sides of the first support portion are in contact with the resistor pieces located on both sides of the first insulating pad, and one side of the second support portion is in contact with the resistor piece near the first fixed baffle or near the second fixed baffle.

[0024] The second objective of this invention is to provide a circuit breaker that can improve the stress condition of the resistor element, reduce or avoid stress concentration, extend service life, and reduce safety hazards.

[0025] To achieve this objective, the present invention adopts the following technical solution:

[0026] This utility model provides a circuit breaker, including an arc-extinguishing chamber and a closing resistor device as described in any of the above optional technical solutions, wherein the closing resistor device is selectively connected in series with the arc-extinguishing chamber.

[0027] The beneficial effects of this utility model include at least the following:

[0028] This invention provides a closing resistor device, which includes a first fixed baffle, a second fixed baffle, a resistor string, a break assembly assembly, and a second insulating rod. The resistor string includes a first insulating rod, a movable plate, and multiple resistive elements. Both ends of the first insulating rod are connected to the first and second fixed baffles. The movable plate and resistive elements are both sleeved on the first insulating rod, with the movable plate positioned between any two resistive elements. The fixed end of the break assembly assembly is connected to the first fixed baffle, and the movable end is connected to the second fixed baffle. One end of the second insulating rod is fixedly connected to the break assembly assembly, and the other end passes through the movable plate and is movably connected to the second fixed baffle. The movable plate can slide along the axial direction of the second insulating rod, and the movable end of the break assembly assembly can drive the second fixed baffle to slide along the axial direction of the second insulating rod.

[0029] As described above, resistive elements are installed on both sides of the movable plate, and the movable plate and resistive elements are sleeved on the first insulating rod. The two ends of the first insulating rod are respectively inserted into and fixed to the first and second fixed baffles. One end of the second insulating rod is fixedly connected to the break assembly assembly, and the other end is movably connected to the second fixed baffle. Thus, during the opening or closing process of the break assembly assembly, the movable end of the break assembly assembly can drive the second fixed baffle to move along the axial direction of the second insulating rod, giving the second fixed baffle a certain amount of movement offset. This improves the stress distribution and reduces or avoids stress concentration. During the transportation and assembly of this closing resistor device, when the resistive elements are subjected to external impact or vibration, the movable plate can slide along the axial direction of the second insulating rod under the thrust of the resistive elements. That is, the movable plate has a certain amount of movement offset, which can compensate to a certain extent for the displacement of the resistive elements caused by vibration, assembly errors, and thermal expansion during operation. This reduces or avoids stress concentration, improves the stress distribution of the closing resistor device, extends its service life, reduces safety hazards, and achieves cost savings.

[0030] This utility model also provides a circuit breaker that can improve the stress condition of the resistor element, reduce or avoid stress concentration, extend service life, and reduce safety hazards. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0032] Figure 1This is a front view of the closing resistor device provided in this embodiment of the utility model;

[0033] Figure 2 yes Figure 1 A cross-sectional view of the closing resistor device along the AA direction;

[0034] Figure 3 yes Figure 2 A magnified view of a section at point B in the middle;

[0035] Figure 4 yes Figure 2 A magnified view of a section at point C;

[0036] Figure 5 yes Figure 2 A magnified view of a section at point D;

[0037] Figure 6 This is a front view of the movable plate provided in this embodiment of the utility model;

[0038] Figure 7 This is a front view of the connecting plate provided in this embodiment of the utility model;

[0039] Figure 8 This is a front view of the first insulating pad provided in this embodiment of the utility model;

[0040] Figure 9 This is a side view of the first insulating pad provided in this embodiment of the utility model;

[0041] Figure 10 This is a front view of the second insulating pad provided in this embodiment of the utility model;

[0042] Figure 11 This is a side view of the second insulating pad provided in this embodiment of the utility model.

[0043] Figure Labels

[0044] 100. Resistor string; 110. First fixed baffle; 1101. First bushing; 120. Second fixed baffle; 1201. Third bushing; 130. First insulating rod; 140. Movable plate; 1401. First through hole; 1402. Second through hole; 1403. Second bushing; 1404. First connecting part; 1405. Second connecting part;

[0045] 150. Resistor element;

[0046] 200. Fragment assembly; 210. Connecting plate; 2101. Third through hole; 2102. Fourth through hole; 2103. Third connecting part; 2104. Fourth connecting part; 220. First fastener; 230. Second fastener;

[0047] 300. Second insulating rod;

[0048] 400. Conductive plate;

[0049] 500, First insulating pad; 510, Seventh through hole; 520, First stepped portion; 530, Second stepped portion; 540, First support portion;

[0050] 600, Second insulating pad; 610, Eighth through hole; 620, Third step; 630, Second support. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0053] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0054] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0055] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0056] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0057] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0058] This embodiment provides a closing resistor device that can improve the stress condition of the resistor element, reduce or avoid stress concentration, extend service life, reduce safety hazards, and save costs.

[0059] like Figures 1-5As shown, the closing resistor device mainly includes a first fixed baffle 110, a second fixed baffle 120, a resistor string 100, a break assembly assembly 200, and a second insulating rod 300. The resistor string 100 includes a first insulating rod 130, a movable plate 140, and multiple resistive elements 150. Both ends of the first insulating rod 130 are connected to the first fixed baffle 110 and the second fixed baffle 120. The movable plate 140 and the resistive elements 150 are both sleeved on the first insulating rod 130, with the movable plate 140 positioned between any two resistive elements 150. The fixed end of the break assembly assembly 200 is connected to the first fixed baffle 110, and the movable end of the break assembly assembly 200 is connected to the second fixed baffle 120. One end of the second insulating rod 300 is fixedly connected to the break assembly assembly 200, and the other end of the second insulating rod 300 passes through the movable plate 140 and is movably connected to the second fixed baffle 120; the movable plate 140 can slide along the axial direction of the second insulating rod 300, and the movable end of the break assembly assembly 200 can drive the second fixed baffle 120 to slide along the axial direction of the second insulating rod 300.

[0060] Based on the above design, in this embodiment, resistive elements 150 are provided on both sides of the movable plate 140, and the movable plate 140 and resistive elements 150 are sleeved on the first insulating rod 130. Simultaneously, both ends of the first insulating rod 130 are respectively inserted into and fixed to the first fixed baffle 110 and the second fixed baffle 120. One end of the second insulating rod 300 is fixedly connected to the break assembly assembly 200, and the other end is movably connected to the second fixed baffle 120. Thus, during the opening or closing process of the break assembly assembly 200, the movable end of the break assembly assembly 200 can drive the second fixed baffle 120 to move along the axial direction of the second insulating rod 300, giving the second fixed baffle 120 a certain amount of movement offset, thereby improving the stress distribution and reducing or avoiding stress concentration. During the transportation and assembly of the closing resistor device, when the resistor piece 150 is subjected to a certain external impact or vibration, the movable plate 140 can slide along the axial direction of the second insulating rod 300 under the thrust of the resistor piece 150. That is, the movable plate 140 has a certain amount of movement offset, which can compensate for the displacement, assembly error and thermal expansion caused by vibration of the resistor piece 150 during operation to a certain extent. This reduces or avoids stress concentration, improves the stress condition of the closing resistor device, extends its service life, reduces safety hazards, and achieves the goal of saving costs.

[0061] Optionally, in this embodiment, there are two resistor strings 100, each with a first insulating rod 130 threaded through it. The two first insulating rods 130 and one second insulating rod 300 are arranged in a triangle. This utilizes the stability of the triangle to reduce the risk of damage or even breakage of the resistor element 150 due to vibration, thus extending its service life and saving costs.

[0062] like Figures 1-2 , Figure 6 As shown, in this embodiment, the movable plate 140 has two first through holes 1401 and one second through hole 1402. The first through hole 1401 is configured to allow the first insulating rod 130 to pass through, and the second through hole 1402 is configured to allow the second insulating rod 300 to pass through. The first through hole 1401 facilitates the passing of the movable plate 140 and the first insulating rod 130, and the second through hole 1402 facilitates the passing of the movable plate 140 and the second insulating rod 300, thereby improving assembly efficiency.

[0063] like Figure 6 As shown, exemplarily, the movable plate 140 in this embodiment includes an integrally formed first connecting portion 1404 and a second connecting portion 1405. The first connecting portion 1404 and the second connecting portion 1405 are coaxially arranged. A first through hole 1401 is provided in the first connecting portion 1404, and a second through hole 1402 is provided in the second connecting portion 1405. This can improve the stability of the movable plate 140 under stress and reduce or avoid local stress concentration. The area of ​​the first connecting portion 1404 is smaller than the area of ​​the second connecting portion 1405, saving materials and reducing costs.

[0064] Meanwhile, the first connecting part 1404 and the second connecting part 1405 are connected by an arc shape, which not only facilitates work assembly and reduces the occurrence of workers' arms being scratched, but also adapts to the shape of the circular resistor piece 150 to prevent short circuits.

[0065] Furthermore, such as Figures 1-2 , Figure 5As shown, in this embodiment, a first bushing 1101 is provided inside the first fixed baffle 110, and a second bushing 1403 is provided in the second through hole 1402. The first insulating rod 130 passes through the first bushing 1101, and the second insulating rod 300 passes through the second bushing 1403. The arrangement of the first bushing 1101 and the second bushing 1403 can reduce the friction between the movable plate 140 and the first insulating rod 130 and the second insulating rod 300, thereby improving the smoothness of the sliding of the movable plate 140 and ensuring that the movable plate 140 can move quickly when the resistor 150 is subjected to external force vibration, reducing or avoiding stress concentration in the resistor 150. In addition, the arrangement of the first bushing 1101 and the second bushing 1403 can also play a certain guiding role for the first insulating rod 130 and the second insulating rod 300.

[0066] like Figures 2-3 , Figure 7 As shown, in this embodiment, the closing resistor device further includes a connecting plate 210 and a first fixing member 220. One end of the connecting plate 210 is connected to the break assembly 200. A third through hole 2101 is provided on the connecting plate 210. The second insulating rod 300 passes through the third through hole 2101. At least two first fixing members 220 are provided. At least two first fixing members 220 are screwed onto the second insulating rod 300. At least two first fixing members 220 are placed on both sides of the connecting plate 210 and abut against the connecting plate 210.

[0067] The connection plate 210 improves the convenience and reliability of connecting the second insulating rod 300 to the break assembly 200. Specifically, the connection plate 210 has a fourth through hole 2102, and the closing resistor device also includes a second fixing member 230. One end of the second fixing member 230 passes through the fourth through hole 2102 and connects to the break assembly 200 to fix the connection plate 210 to the break assembly 200. The second fixing member 230 can be a bolt, screw, or other similar component. The second fixing member 230 facilitates the disassembly and maintenance of the connection plate 210, improving the efficiency of subsequent disassembly and maintenance work.

[0068] The first fixing member 220 is located on both sides of the connecting plate 210. The first fixing member 220 is fastened to the second insulating rod 300 by screwing, thereby realizing the fixed connection between the second insulating rod 300 and the connecting plate 210 and preventing displacement or loosening of the second insulating rod 300 during use. Optionally, the first fixing member 220 can be set as a nut, and one, two, or three nuts can be set on both sides of the connecting plate 210.

[0069] like Figure 7As shown, the connecting plate 210 includes an integrally formed third connecting portion 2103 and a fourth connecting portion 2104. A third through hole 2101 is provided in the third connecting portion 2103, and a fourth through hole 2102 is provided in the fourth connecting portion 2104. The third connecting portion 2103 and the fourth connecting portion 2104 are transitioned by a right angle or a rounded corner, which not only saves material for the connecting plate 210 but also avoids interference between the connecting plate 210 and the second insulating rod 300. Furthermore, the fourth connecting portion 2104 is arc-shaped on the side facing the break assembly assembly 200 to fit the outer peripheral surface of the break assembly assembly 200, improving the ease and stability of assembly of the connecting plate 210 and avoiding interference between the connecting plate 210 and the break assembly assembly 200.

[0070] like Figure 2 As shown, in this embodiment, a fifth through hole is provided on the second fixed baffle 120, and a third bushing 1201 is provided in the fifth through hole. The end of the second insulating rod 300 away from the connecting plate 210 passes through the third bushing 1201. This can improve the smoothness of the movement of the second fixed baffle 120 and avoid interference and friction between the second insulating rod 300 and the second fixed baffle 120 during the movement. This ensures that the second fixed baffle 120 can slide quickly along the axial direction of the second insulating rod 300 during the closing and opening of the break assembly 200, thereby improving the stress condition of the closing resistor device.

[0071] like Figure 2 and Figure 4 As shown, in this embodiment, the closing resistor device further includes multiple conductive plates 400. Two conductive plates 400 are disposed between two adjacent resistor pieces 150 on a resistor string 100. Each pair of conductive plates 400 extends to the adjacent resistor string 100, and the two conductive plates 400 are positioned on both sides of one resistor piece 150 in the adjacent resistor string 100. The two conductive plates 400 are respectively connected to both sides of the resistor piece 150, so that the resistor pieces 150 on the two resistor strings 100 are connected in series to form a series circuit. A first insulating pad 500 is disposed between the two conductive plates 400 placed between two adjacent resistor pieces 150 on the same resistor string 100; a second insulating pad 600 is disposed between the first fixed baffle 110 and the resistor piece 150, and / or between the second fixed baffle 120 and the resistor piece 150.

[0072] The first insulating pad 500 is used to insulate two adjacent resistor pieces 150 on the same resistor string 100, and the second insulating pad 600 is used to insulate the first fixed baffle 110 from the resistor piece 150, or the second fixed baffle 120 from the resistor piece 150, thereby preventing short circuits and improving the safety performance of the closing resistor device.

[0073] By connecting the conductive plate 400 and the resistor piece 150 as described above, the resistor pieces 150 on the two resistor strings 100 can be electrically connected in series to form a series circuit. Of course, in some optional embodiments, there can be multiple resistor strings 100. It is understood that no matter how many resistor strings 100 are set, a series circuit can be formed by using the above-described connection method between the conductive plate 400 and the resistor piece 150, which improves versatility and allows operators to set the appropriate number of resistor strings 100 according to actual needs.

[0074] like Figure 2 , Figures 8-11 As shown, in this embodiment, the conductive plate 400 has a sixth through hole for the first insulating rod 130 to pass through, and the first insulating pad 500 has a seventh through hole 510 for the first insulating rod 130 to pass through. A first step portion 520 and a second step portion 530 are respectively provided around the seventh through hole 510 on both sides of the first insulating pad 500. The first step portion 520 and the second step portion 530 are respectively embedded in the sixth through hole of the conductive plate 400 that contacts both sides of the first insulating pad 500. The second insulating pad 600 has an eighth through hole 610 for the first insulating rod 130 to pass through, and a third step portion 620 is provided on one side of the second insulating pad 600. The third step portion 620 is embedded in the sixth through hole of the conductive plate 400 that contacts the second insulating pad 600.

[0075] By setting the first step portion 520 and the second step portion 530 on the first insulating pad 500, and setting the third step portion 620 on the second insulating pad 600, the first insulating pad 500 and the second insulating pad 600 can play a certain limiting role on their respective embedded conductive plates 400, thereby ensuring that the conductive plates 400, the first insulating pad 500, the resistor sheet 150, and the second insulating pad 600 can always be concentrically set, improving the stability and reliability of the closing resistor device.

[0076] like Figures 8-11 As shown, in this embodiment, a first support portion 540 is provided on the first insulating pad 500, and a second support portion 630 is provided on the second insulating pad 600. The opposite sides of the first support portion 540 are in contact with the resistor pieces 150 located on both sides of the first insulating pad 500, and one side of the second support portion 630 is in contact with the resistor piece 150 near the first fixed baffle 110 or near the second fixed baffle 120.

[0077] Specifically, in this embodiment, the opposite sides of the first support portion 540 protrude from the end face of the first insulating pad 500. Since the second support portion 630 is located at the beginning and end of the resistor string 100, the second support portion 630 only contacts one resistor piece 150. Therefore, only one side of the second support portion 630 needs to protrude from the end face of the second insulating pad 600, and the other side of the second support portion 630 is flush with the end face of the second insulating pad 600, which facilitates the assembly of the resistor string 100.

[0078] When the resistor 150 cracks due to overload, the first support part 540 and the second support part 630 can provide some support for the resistor 150, improve the protection of the resistor 150, reduce the collision between resistors 150, and extend the service life.

[0079] Optionally, in this embodiment, both the first support portion 540 and the second support portion 630 are semi-enclosed structures, saving materials and reducing costs. For example, the arc length of the first support portion 540 can be set to 1 / 4 to 1 / 2 of the circumference of the first insulating pad 500, and the arc length of the second support portion 630 can be set to 1 / 4 to 1 / 2 of the circumference of the second insulating pad 600.

[0080] This embodiment also provides a circuit breaker, which includes an arc-extinguishing chamber (not shown in the figure) and the above-mentioned closing resistor device, wherein the closing resistor device is selectively connected in series with the arc-extinguishing chamber.

[0081] Specifically, in this embodiment, the closing resistor device is typically connected in series with the arc-extinguishing chamber. During the circuit breaker's closing process, the current first passes through the closing resistor device and then through the arc-extinguishing chamber. When the main contacts close, the closing resistor device is short-circuited, and the current flows directly through the arc-extinguishing chamber.

[0082] The closing resistor and the arc-extinguishing chamber are usually installed in the same porcelain bushing or in a nearby location to facilitate their connection and coordination. Furthermore, their structure and dimensions need to be designed and selected based on the rated current and voltage level of the circuit breaker.

[0083] Since the circuit breaker includes the aforementioned closing resistor device, it can improve the stress condition of the resistor 150, reduce or avoid stress concentration, extend service life, reduce safety hazards, and achieve the goal of saving costs.

[0084] Obviously, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0085] Note that in the description of this specification, the references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A closing resistor device, characterized in that, include: First fixed baffle (110) and second fixed baffle (120); A resistor string (100) includes a first insulating rod (130), a movable plate (140), and a plurality of resistor pieces (150); the two ends of the first insulating rod (130) are connected to the first fixed baffle (110) and the second fixed baffle (120); the movable plate (140) and the resistor pieces (150) are both sleeved on the first insulating rod (130), and the movable plate (140) is located between any two resistor pieces (150); A fracture assembly assembly (200) is provided, wherein the fixed end of the fracture assembly assembly (200) is connected to the first fixed baffle (110), and the movable end of the fracture assembly assembly (200) is connected to the second fixed baffle (120). The second insulating rod (300) has one end fixedly connected to the break assembly assembly (200), and the other end of the second insulating rod (300) passes through the movable plate (140) and is movably connected to the second fixed baffle (120). The movable plate (140) can slide along the axial direction of the second insulating rod (300), and the movable end of the break assembly assembly (200) can drive the second fixed baffle (120) to slide along the axial direction of the second insulating rod (300).

2. The closing resistor device according to claim 1, characterized in that, The resistor strings (100) are configured as two, and the first insulating rod (130) and the second insulating rod (300) of the two resistor strings (100) are arranged in a triangle.

3. The closing resistor device according to claim 2, characterized in that, The movable plate (140) has two first through holes (1401) and one second through hole (1402). The first through hole (1401) is configured to pass through the first insulating rod (130), and the second through hole (1402) is configured to pass through the second insulating rod (300).

4. The closing resistor device according to claim 3, characterized in that, The movable plate (140) includes an integrally formed first connecting part (1404) and a second connecting part (1405), and the first connecting part (1404) and the second connecting part (1405) are coaxially arranged. The first through hole (1401) is provided in the first connecting part (1404), and the second through hole (1402) is provided in the second connecting part (1405). The first connecting part (1404) and the second connecting part (1405) are connected by an arc.

5. The closing resistor device according to claim 3, characterized in that, The first fixed baffle (110) is provided with a first bushing (1101), the second through hole (1402) is provided with a second bushing (1403), the first insulating rod (130) passes through the first bushing (1101), and the second insulating rod (300) passes through the second bushing (1403).

6. The closing resistor device according to claim 1, characterized in that, The closing resistor device further includes a connecting plate (210) and a first fixing member (220). One end of the connecting plate (210) is connected to the break assembly (200). A third through hole (2101) is provided on the connecting plate (210). The second insulating rod (300) passes through the third through hole (2101). At least two first fixing members (220) are provided. At least two first fixing members (220) are screwed onto the second insulating rod (300). At least two first fixing members (220) are placed on both sides of the connecting plate (210) and abut against the connecting plate (210).

7. The closing resistor device according to claim 6, characterized in that, The connecting plate (210) is provided with a fourth through hole (2102), and the closing resistor device further includes a second fixing member (230). One end of the second fixing member (230) passes through the fourth through hole (2102) and is connected to the break assembly (200).

8. The closing resistor device according to claim 7, characterized in that, The connecting plate (210) includes an integrally formed third connecting part (2103) and a fourth connecting part (2104). The third through hole (2101) is disposed in the third connecting part (2103), and the fourth through hole (2102) is disposed in the fourth connecting part (2104). The third connecting part (2103) and the fourth connecting part (2104) are transitioned by a right angle or a rounded corner. The fourth connecting part (2104) is arc-shaped on the side facing the fracture assembly (200) to fit the outer peripheral surface of the fracture assembly (200).

9. The closing resistor device according to claim 7, characterized in that, The second fixed baffle (120) has a fifth through hole, and a third bushing (1201) is provided in the fifth through hole. The end of the second insulating rod (300) away from the connecting plate (210) passes through the third bushing (1201).

10. The closing resistor device according to claim 2, characterized in that, The closing resistor device further includes multiple conductive plates (400), wherein two conductive plates (400) are disposed between two adjacent resistor pieces (150) on a resistor string (100), each pair of conductive plates (400) extends to the adjacent resistor string (100), and the two conductive plates (400) are placed on both sides of one resistor piece (150) in the adjacent resistor string (100), and the two conductive plates (400) are respectively connected to both sides of the resistor piece (150), so that the resistor pieces (150) on the two resistor strings (100) are connected in series and form a series circuit; A first insulating pad (500) is provided between two conductive plates (400) placed between two adjacent resistor pieces (150) on the same resistor string (100); a second insulating pad (600) is provided between the first fixing baffle (110) and the resistor piece (150), and / or between the second fixing baffle (120) and the resistor piece (150).

11. The closing resistor device according to claim 10, characterized in that, The first insulating pad (500) is provided with a first support portion (540), and the second insulating pad (600) is provided with a second support portion (630). The opposite sides of the first support portion (540) are in contact with the resistive sheet (150) located on both sides of the first insulating pad (500), and one side of the second support portion (630) is in contact with the resistive sheet (150) near the first fixed baffle (110) or near the second fixed baffle (120).

12. A circuit breaker, characterized in that, It includes an arc-extinguishing chamber and a closing resistor device according to any one of claims 1-11, wherein the closing resistor device is selectively connected in series with the arc-extinguishing chamber.

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