Impact-resistant current-limiting resistor

Abstract

The utility model discloses an anti-impact current-limiting resistor, and relates to the field of resistors, the anti-impact current-limiting resistor comprises a shell, a resistor disc, a connecting pressing block and a filling layer, the shell is of a structure with an upper opening and is provided with a first accommodating cavity; the resistor disc is placed in the first accommodating cavity, and the periphery of the resistor disc abuts against the inner wall of the first accommodating cavity; the two connecting pressing blocks are located in the first containing cavity, one ends of the two connecting pressing blocks are electrically connected with the two ends of the resistor disc respectively, and the other ends of the two connecting pressing blocks are exposed out of the opening of the shell; and the filling layer is formed in the first accommodating cavity, is in contact with the surface of the resistor disc and is used for fixing and protecting the resistor disc in the first accommodating cavity. According to the invention, the working stability of the resistor in the application of the circuit breaker can be improved, and the service life is prolonged.

Description

Technical Field

[0001] This application relates to the field of resistor technology, and in particular to an impact-resistant current-limiting resistor. Background Technology

[0002] In the application of impact-resistant current-limiting resistors, the resistor element, as the core conductive component, directly affects the resistor's operational reliability due to its installation stability within the housing. In existing technologies, the resistor element is typically placed within the housing cavity, but a gap often exists between the resistor element and the inner wall of the cavity, lacking effective structural constraint. When the circuit breaker is in operation (opening or closing) or when there is vibration or impact in the external environment, the resistor element is prone to shaking and displacement within the cavity. This can not only lead to loosening of the electrical connection between the resistor element and connecting components but also cause structural damage to the resistor element itself due to continuous mechanical stress, thereby affecting the overall stability and service life of the resistor. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes an impact-resistant current-limiting resistor, which can improve the operating stability of the resistor in circuit breaker applications and extend its service life.

[0004] This application provides an impact-resistant current-limiting resistor, comprising:

[0005] A housing, wherein the housing has an opening at the top and is provided with a first receiving cavity;

[0006] A resistor is placed in the first receiving cavity, and the outer periphery of the resistor abuts against the inner wall of the first receiving cavity;

[0007] Two connecting blocks are provided and located in the first receiving cavity. One end of each connecting block is electrically connected to both ends of the resistor, and the other end protrudes from the opening of the housing.

[0008] A filling layer is formed within the first receiving cavity and contacts the surface of the resistor sheet, serving to fix and protect the resistor sheet within the first receiving cavity.

[0009] The impact-resistant current-limiting resistor according to the embodiments of this application has at least the following beneficial effects: the first receiving cavity of the housing forms a fitting structure with the resistor piece, the outer periphery of the resistor piece directly abuts against the inner wall of the receiving cavity, and two connecting pressure blocks located in the receiving cavity are electrically connected to both ends of the resistor piece respectively, and the filling layer fills the receiving cavity and is in close contact with the surface of the resistor piece. The abutment between the outer periphery of the resistor piece and the inner wall of the receiving cavity forms an initial constraint, reducing the lateral sway space of the resistor piece during vibration and impact. Combined with the filling of the gap by the filling layer and the fixing of the resistor piece, the resistor piece is stably limited, avoiding loosening of the electrical connection between the connecting pressure blocks and the resistor piece due to displacement, and also reducing damage to the resistor piece caused by continuous mechanical stress, thereby effectively improving the working stability of the resistor in circuit breaker applications and extending its service life.

[0010] According to some embodiments of this application, the housing is further provided with a second receiving cavity. There are two second receiving cavities and they communicate with the first receiving cavity. The two second receiving cavities are respectively located below the two ends of the resistor sheet. A fixing block is provided in the second receiving cavity. The upper surface of the fixing block is flush with the bottom of the first receiving cavity. The connecting pressure block passes through the end of the resistor sheet through a connector and is fixed to the corresponding fixing block.

[0011] According to some embodiments of this application, the connecting block and the fixing block are made of copper, and the connecting block and the fixing block are in contact with the upper and lower surfaces of the corresponding ends of the resistor sheet, respectively.

[0012] According to some embodiments of this application, the housing is further provided with a third receiving cavity. There are two third receiving cavities and they communicate with the first receiving cavity. The two third receiving cavities are respectively located on the outer side of the two ends of the resistor. The connecting pressure block is partially housed in the first receiving cavity and electrically connected to the corresponding end of the resistor. The other part is housed in the third receiving cavity and protrudes from the opening of the housing.

[0013] According to some embodiments of this application, the length of the third receiving cavity is less than the length of the first receiving cavity along the width direction of the housing.

[0014] According to some embodiments of this application, the filling layer simultaneously covers the portions of the resistor sheet and the connecting block located in the first receiving cavity.

[0015] According to some embodiments of this application, the resistor sheet is flat and has a serpentine, meandering structure, and the resistor sheet is made of constantan alloy.

[0016] According to some embodiments of this application, the housing is made of glass fiber material.

[0017] According to some embodiments of this application, the filler layer is a mixture of cementitious material and resin material.

[0018] According to some embodiments of this application, the housing is provided with mounting holes around its perimeter for docking with external connecting components.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0020] Additional aspects and advantages of this application will become apparent and readily understood in conjunction with the following description of the embodiments, in which:

[0021] Figure 1 A schematic diagram of the structure of an impact-resistant current-limiting resistor provided in some embodiments of this application;

[0022] Figure 2 An exploded view of a shock-resistant current-limiting resistor provided in some embodiments of this application;

[0023] Figure 3 A cross-sectional view of a shock-resistant current-limiting resistor provided in some embodiments of this application;

[0024] Figure 4 The diagram shows the structure of the housing provided for some embodiments of this application.

[0025] The attached icons are numbered as follows:

[0026] Housing 100; First receiving cavity 110; Second receiving cavity 120; Third receiving cavity 130; Mounting hole 140; Resistor 200; Connecting pressure block 300; Filling layer 400; Fixing block 500. Detailed Implementation

[0027] The embodiments of this application are described in detail below. Examples of the 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 application, and should not be construed as limiting this application.

[0028] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and 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 application.

[0029] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0030] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0031] In the application of impact-resistant current-limiting resistors, the resistor element, as the core conductive component, directly affects the resistor's operational reliability due to its installation stability within the housing. In existing technologies, the resistor element is typically placed within the housing cavity, but a gap often exists between the resistor element and the inner wall of the cavity, lacking effective structural constraint. When the circuit breaker is in operation (opening or closing) or when there is vibration or impact in the external environment, the resistor element is prone to shaking and displacement within the cavity. This can not only lead to loosening of the electrical connection between the resistor element and connecting components but also cause structural damage to the resistor element itself due to continuous mechanical stress, thereby affecting the overall stability and service life of the resistor.

[0032] Based on this, this application provides an impact-resistant current-limiting resistor to solve the aforementioned technical problems. The technical solutions proposed in this application will now be described in detail one by one.

[0033] Reference Figures 1 to 4 This application provides an impact-resistant current-limiting resistor, comprising: a housing 100, a resistive sheet 200, connecting blocks 300, and a filling layer 400. The housing 100 has an open top and a first receiving cavity 110. The resistive sheet 200 is placed in the first receiving cavity 110, and the outer periphery of the resistive sheet 200 abuts against the inner wall of the first receiving cavity 110. Two connecting blocks 300 are provided and located in the first receiving cavity 110. One end of each connecting block 300 is electrically connected to both ends of the resistive sheet 200, and the other end protrudes from the opening of the housing 100. The filling layer 400 is formed in the first receiving cavity 110 and contacts the surface of the resistive sheet 200, for fixing and protecting the resistive sheet 200 in the first receiving cavity 110.

[0034] The first receiving cavity 110 of the housing 100 forms a fitting structure with the resistor 200. The outer periphery of the resistor 200 directly abuts against the inner wall of the receiving cavity. Two connecting blocks 300 located in the receiving cavity are electrically connected to both ends of the resistor 200, and the filling layer 400 fills the receiving cavity and is in close contact with the surface of the resistor 200. The abutment between the outer periphery of the resistor 200 and the inner wall of the receiving cavity forms an initial constraint, reducing the lateral sway space of the resistor 200 during vibration and impact. Combined with the filling of the gap by the filling layer 400 and the fixing of the resistor 200, the resistor 200 is stably limited, avoiding loosening of the electrical connection between the connecting blocks 300 and the resistor 200 due to displacement, and also reducing damage to the resistor 200 caused by continuous mechanical stress. This effectively improves the working stability of the resistor in circuit breaker applications and extends its service life.

[0035] Reference Figures 2 to 4 It is understood that the housing 100 is also provided with a second receiving cavity 120. There are two second receiving cavities 120 and they are connected to the first receiving cavity 110. The two second receiving cavities 120 are respectively located below the two ends of the resistor sheet 200. A fixing block 500 is provided in the second receiving cavity 120. The upper surface of the fixing block 500 is flush with the bottom of the first receiving cavity 110. The connecting pressure block 300 passes through the end of the resistor sheet 200 through the connector and is fixed to the corresponding fixing block 500. The fact that the fixing block 500 is flush with the bottom of the first receiving cavity 110 ensures that the resistance piece 200 is evenly stressed and avoids tilting when placed. The connecting pressure block 300, through the fixing of the connecting piece and the fixing block 500, further firmly limits the end of the resistance piece 200. Combined with the abutment between the outer periphery of the resistance piece 200 and the inner wall of the first receiving cavity 110 and the fixing effect of the filling layer 400, the electrical connection at both ends of the resistance piece 200 and the overall position are more stable, reducing the loosening or displacement of the end of the resistance piece 200 during vibration and impact. This enhances the reliability of the electrical connection between the connecting pressure block 300 and the resistance piece 200, and further improves the structural stability and operational reliability of the resistor.

[0036] Understandably, the connecting block 300 and the fixing block 500 are made of copper, and they contact the upper and lower surfaces of the corresponding ends of the resistor 200, respectively. Copper has good electrical and thermal conductivity. Its contact with the ends of the resistor 200 ensures the reliability of the electrical connection between the connecting block 300 and the resistor 200, reduces energy loss due to contact resistance, and allows the copper to quickly conduct the heat generated by the resistor 200 during operation, thus improving heat dissipation. At the same time, the clamping structure further restricts the displacement of the resistor 200 ends during vibration and impact. Combined with the housing 100's receiving cavity and filling layer 400, this makes the resistor 200 more securely fixed, thereby enhancing the overall structure's impact resistance and improving the resistor's working stability and service life.

[0037] Continue to refer to Figures 2 to 4 The housing 100 also includes two third receiving cavities 130, which are connected to the first receiving cavity 110. The two third receiving cavities 130 are located on the outer sides of the two ends of the resistor 200. A portion of the connecting block 300 is housed within the first receiving cavity 110 and electrically connected to the corresponding end of the resistor 200. The other portion is housed within the third receiving cavity 130 and protrudes from the opening of the housing 100. The third receiving cavity 130 provides a dedicated limiting space for the connecting block 300, which can constrain the lateral and longitudinal displacement of the connecting block 300 during vibration and impact, preventing it from detaching from the connection position with the resistor 200 due to shaking. Simultaneously, the portion of the connecting block 300 protruding from the third receiving cavity 130 allows for a more stable connection to the external circuit. Combined with the abutment between the outer periphery of the resistor 200 and the inner wall of the first receiving cavity 110, and the fixation of the filling layer 400, this further ensures the continuity and stability of the electrical connection between the connecting block 300 and the resistor 200, thereby enhancing the overall anti-interference capability and operational reliability of the resistor structure.

[0038] Reference Figure 4 It is understood that, along the width direction of the housing 100, the length of the third receiving cavity 130 is less than the length of the first receiving cavity 110. Through the above structural design, it is possible to ensure that the first receiving cavity 110 has sufficient length to accommodate the placement requirements of the resistor 200, while the shorter length of the third receiving cavity 130 provides lateral constraint on the exposed portion of the connecting pressure block 300, reducing the swaying space of the connecting pressure block 300 in the width direction and avoiding the risk of displacement due to vibration and impact caused by excessive extension. At the same time, it makes the overall structure of the housing 100 more compact, and together with other fixing structures, further enhances the stability of the connection between the connecting pressure block 300 and the resistor 200, improving the resistor's anti-interference capability and operational reliability.

[0039] Reference Figure 1 and Figure 3 It is understood that the filling layer 400 simultaneously covers the portions of the resistor 200 and the connecting pressure block 300 located in the first receiving cavity 110. The filling layer 400 can simultaneously fill the gaps between the resistor 200 and the connecting pressure block 300, as well as between them and the inner wall of the first receiving cavity 110, forming a unified and fixed structure through overall wrapping. This reduces the relative displacement of the two during vibration and impact, prevents the electrical connection between the connecting pressure block 300 and the resistor 200 from being affected by local loosening, and enhances the overall stability of the resistor 200 and the connecting pressure block 300 within the housing 100.

[0040] Reference Figure 2It is understood that the resistor 200 is flat and has a serpentine, meandering structure. The resistor 200 is made of constantan alloy, and specifically, its thickness can be selected as 0.3mm. The flat design facilitates full contact between the resistor 200 and the filler layer 400. The serpentine, meandering structure allows for a reasonable extension of the resistor 200's length within a limited space to accommodate low resistance requirements, while also increasing the heat dissipation surface area. Constantan alloy itself possesses stable resistivity and temperature characteristics. Combined with the above structure, this improves the heat dissipation efficiency and power tolerance of the resistor 200, reduces resistance drift under temperature fluctuations, and, combined with the overall fixed structure, further enhances the resistor's operational stability and reliability under vibration and shock conditions.

[0041] Understandably, the housing 100 is made of fiberglass. Fiberglass itself has high insulation strength, which can effectively isolate internal conductive components such as constantan alloy foil and copper clamping blocks from the external environment, avoiding the risk of leakage or breakdown, and meeting the safety requirements of high-voltage circuit breaker scenarios. At the same time, its good mechanical strength can enhance the housing 100's ability to support and fix internal components. Combined with the structural design of each housing cavity, it further improves the overall stability of the resistor under vibration and shock conditions, ensuring that internal components work reliably in a safe environment.

[0042] Understandably, the filler layer 400 is a mixture of cement and resin materials. Cement has good thermal conductivity, which helps to conduct the heat generated by the resistor 200 during operation, while the resin enhances the sealing and adhesion of the filler layer 400, ensuring full contact and fixation with the internal conductive components. The combination of the two not only improves the stable constraint of the filler layer 400 on the resistor 200 and the connecting block 300, meeting the safety requirements of high-voltage circuit breaker scenarios, but also enhances the stability and reliability of the overall structure.

[0043] Understandably, the housing 100 has mounting holes 140 around its perimeter, which are used to mate with external connection components. Through the cooperation of the mounting holes 140 with external connection components, the resistor can be securely installed in the working position of the circuit breaker, improving the overall installation stability and reliability of the resistor in the circuit breaker's working environment.

[0044] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. An impact-resistant current-limiting resistor, characterized in that, include: A housing, wherein the housing has an opening at the top and is provided with a first receiving cavity; A resistor is placed in the first receiving cavity, and the outer periphery of the resistor abuts against the inner wall of the first receiving cavity; Two connecting blocks are provided and located in the first receiving cavity. One end of each connecting block is electrically connected to both ends of the resistor, and the other end protrudes from the opening of the housing. A filling layer is formed within the first receiving cavity and contacts the surface of the resistor sheet, serving to fix and protect the resistor sheet within the first receiving cavity.

2. The impact-resistant current-limiting resistor according to claim 1, characterized in that, The housing is further provided with a second receiving cavity. There are two second receiving cavities and they communicate with the first receiving cavity. The two second receiving cavities are respectively located below the two ends of the resistor. A fixing block is provided in the second receiving cavity. The upper surface of the fixing block is flush with the bottom of the first receiving cavity. The connecting pressure block passes through the end of the resistor through a connector and is fixed to the corresponding fixing block.

3. The impact-resistant current-limiting resistor according to claim 2, characterized in that, The connecting block and the fixing block are made of copper, and the connecting block and the fixing block are in contact with the upper and lower surfaces of the corresponding ends of the resistor, respectively.

4. The impact-resistant current-limiting resistor according to claim 1, characterized in that, The housing is further provided with a third receiving cavity. There are two third receiving cavities and they communicate with the first receiving cavity. The two third receiving cavities are located on the outer side of the two ends of the resistor. The connecting pressure block is partially housed in the first receiving cavity and electrically connected to the corresponding end of the resistor. The other part is housed in the third receiving cavity and protrudes from the opening of the housing.

5. The impact-resistant current-limiting resistor according to claim 4, characterized in that, Along the width direction of the housing, the length of the third receiving cavity is less than the length of the first receiving cavity.

6. The impact-resistant current-limiting resistor according to claim 4, characterized in that, The filling layer simultaneously covers the portions of the resistor sheet and the connecting pressure block located in the first receiving cavity.

7. The impact-resistant current-limiting resistor according to claim 1, characterized in that, The resistor is flat and has a serpentine, meandering structure, and is made of constantan alloy.

8. The shock-resistant current-limiting resistor according to claim 1, characterized in that, The shell is made of fiberglass material.

9. The surge-resistant current-limiting resistor according to any one of claims 1 to 8, characterized in that, The filler layer is a mixture of cementitious materials and resin materials.

10. The surge-resistant current-limiting resistor according to any one of claims 1 to 8, characterized in that, The housing has mounting holes around its perimeter, which are used to connect with external connecting components.

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