Closing resistor and manufacturing method thereof

Abstract

The invention relates to the technical field of structural combination of resistors, in particular to a closing resistor and a manufacturing method of the closing resistor. The closing resistor comprises an insulating pull rod, a plurality of resistor discs are sleeved on the insulating pull rod along the axial direction of the insulating pull rod, a buffer sleeve is arranged between the insulating pull rod and the resistor discs, the buffer sleeve comprises an external lining layer and an internal filling support, the lining layer is in contact with the filling support, and the lining layer is in contact with the filling support. The filling support is in contact with the insulating pull rod, the buffer sleeve wraps the insulating pull rod, the inner wall of the buffer sleeve is attached to the outer peripheral surface of the insulating pull rod, and the outer wall of the buffer sleeve is attached to the inner hole wall of the resistor disc. The buffering sleeve of the closing resistor is not prone to deformation, vibration and collision between the resistor disc and the buffering sleeve are avoided due to tight attachment, the service life of the resistor disc can be prolonged, and meanwhile stability and reliability of the closing resistor during operation can be guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of resistor structure combination, and in particular to a closing resistor and a manufacturing method of the closing resistor. Background Art

[0002] Closing resistor is one of the important parts in high-voltage switchgear. It mainly plays the role of preventing overvoltage during closing in high-voltage switchgear, and meets the requirements of safe, stable and efficient operation of power system. At present, the commonly used closing resistor is a bushing on the outer sleeve of insulating rod, a resistor sheet is arranged on the outer sleeve of bushing, and a conductive vibration damping sheet is installed between two adjacent resistor sheets. The bushing is made of polytetrafluoroethylene, which mainly plays the role of preventing the resistor sheet from colliding with the insulating rod and causing damage.

[0003] For example, a Chinese invention patent with the authorization announcement number CN114446561B and the authorization announcement date October 18, 2024 discloses a closing resistor, which includes an insulating pull rod, on which a plurality of resistor sheets are mounted, and a buffer sleeve is provided between the insulating pull rod and the resistor sheet to buffer the insulating pull rod and the resistor sheet during vibration, and a conductive vibration damping sheet is also provided between two adjacent resistor sheets. By providing a buffer sleeve between the insulating pull rod and the resistor sheet, vibration generated during the transportation and operation of the circuit breaker can be prevented from causing collision between the insulating pull rod and the resistor sheet, thereby causing damage, thereby ensuring the safety and reliability of the closing resistor during operation. The buffer sleeve of the closing resistor is composed of two parts, which are mounted on the insulating pull rod. The cross-section of the buffer sleeve is U-shaped. When vibration occurs, it can only play a buffering role in one direction of the insulating pull rod. However, the working conditions of the closing resistor are relatively complicated during operation, and vibration may occur in all reverse directions. The buffer sleeve of the closing resistor is prone to deformation, and the vibration reduction effect of the buffer sleeve is deteriorated. There may also be a gap between the resistor plate and the buffer sleeve. During the mechanical operation of the circuit breaker, the resistor plate will vibrate, and the resistor plate and the insulating pull rod may collide and wear. Under long-term use, there may be a problem of cracking of the resistor plate, which affects the performance of the closing resistor. Summary of the invention

[0004] The object of the present invention is to provide a closing resistor to solve the problem that the buffer sleeve of the existing closing resistor is easily deformed, which may cause the resistor sheet to crack after long-term use; the object of the present invention is also to provide a manufacturing method of the closing resistor.

[0005] To achieve the above purpose, the closing resistor of the present invention adopts the following technical solution: A closing resistor comprises an insulating rod on which a plurality of resistor sheets are sleeved along the axial direction of the insulating rod, a buffer sleeve is arranged between the insulating rod and the resistor sheets, the buffer sleeve comprises an outer lining layer and an inner filling support, the lining layer contacts the filling support, the filling support contacts the insulating rod, the buffer sleeve is wrapped around the outside of the insulating rod, the inner wall of the buffer sleeve is fitted with the outer peripheral surface of the insulating rod, and the outer wall of the buffer sleeve is fitted with the inner hole wall of the resistor sheets.

[0006] Furthermore, a conductive vibration-damping sheet is arranged between two adjacent resistor sheets.

[0007] Furthermore, the conductive vibration damping sheet is an aluminum foil sheet.

[0008] Furthermore, the insulating pull rod is a hollow rod-shaped structure.

[0009] Furthermore, the length of the buffer sleeve is not less than the length of the insulating pull rod.

[0010] Beneficial effects: The closing resistor of the present invention is an improved invention. The closing resistor of the present invention is provided with a buffer sleeve between the insulating pull rod and the resistor sheet, and the buffer sleeve is in close contact with the insulating pull rod and the resistor sheet. When the closing resistor is in operation, the buffer sleeve can reduce the vibration of the insulating pull rod and the resistor sheet in all directions, thereby improving the reliability of the product during operation. The buffer sleeve is wrapped around the outside of the insulating pull rod, and at the same time, since the buffer sleeve is in close contact with the insulating pull rod and the resistor sheet, there is no gap between the buffer sleeve and the resistor sheet, and the buffer sleeve is not easy to deform during operation. Since the resistor sheet and the buffer sleeve are in close contact, there will be no vibration or collision, which can prevent the resistor sheet from cracking due to collision between the resistor sheet and the buffer sleeve, and can extend the service life of the resistor sheet while ensuring the stability and reliability of the closing resistor during operation.

[0011] The manufacturing method of the closing resistor of the present invention adopts the following technical scheme: A method for manufacturing a closing resistor comprises the following steps: coating an insulating rod with a flexible lining, sleeve a resistor sheet on the outside of the lining, injecting a curable filling support between the insulating rod and the lining, and curing the filling support under ambient temperature or high temperature conditions; the lining and the filling support constitute a buffer sleeve, the buffer sleeve is wrapped around the outside of the insulating rod, the inner wall of the buffer sleeve is fitted with the outer peripheral surface of the insulating rod, and the outer wall of the buffer sleeve is fitted with the inner hole wall of the resistor sheet.

[0012] Furthermore, a conductive vibration-damping sheet is arranged between two adjacent resistor sheets.

[0013] Furthermore, the conductive vibration damping sheet is an aluminum foil sheet.

[0014] Furthermore, the insulating pull rod is a hollow rod-shaped structure.

[0015] Furthermore, the length of the buffer sleeve is not less than the length of the insulating pull rod.

[0016] Beneficial effect: The manufacturing method of the closing resistor of the present invention is a pioneering invention. The manufacturing method of the closing resistor of the present invention includes a flexible lining layer on the outside of the insulating pull rod, a resistor sheet is set outside the lining layer, a curable filling support is injected between the insulating pull rod and the lining layer, and the filling support is cured at ambient temperature or high temperature environment. After the filling support is cured, it can fill the gap between the resistor sheet and the insulating pull rod. The lining layer and the cured filling support form a buffer sleeve, and the buffer sleeve is in contact with the insulating pull rod and the resistor sheet. When the closing resistor is in operation, the buffer sleeve can reduce the vibration of the insulating pull rod and the resistor sheet in all directions, and improve the reliability of the product during operation. The buffer sleeve is wrapped around the outside of the insulating pull rod. At the same time, since the buffer sleeve is tightly fitted with the insulating pull rod and the resistor sheet, there will be no gap between the buffer sleeve and the resistor sheet. The buffer sleeve is not easy to deform during operation. The resistor sheet and the buffer sleeve will not vibrate or collide due to the tight fit, which can prevent the resistor sheet from colliding with the buffer sleeve and causing the resistor sheet to crack. The service life of the resistor sheet can be extended while ensuring the stability and reliability of the closing resistor during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of an embodiment of a closing resistor of the present invention; Figure 2 It is a schematic diagram of the structure of the closing resistor of the present invention before the filling support is filled; Figure 3 It is a schematic diagram of the structure of the closing resistor of the present invention after being filled with a filling support.

[0018] In the figure: 1. Insulating pull rod; 2. Resistor; 3. Buffer sleeve; 4. Conductive vibration damping sheet; 5. Lining layer; 6. Filling support. DETAILED DESCRIPTION

[0019] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0020] The closing resistor of the present invention has a buffer sleeve arranged on the insulating pull rod, and the resistor sheet is arranged outside the buffer sleeve. The buffer sleeve, the insulating pull rod and the resistor sheet are all tightly fitted, that is, they fit each other at the matching position to form a fit so that there is no gap between the buffer sleeve, the insulating pull rod and the resistor sheet. During operation, the buffer sleeve is not easy to deform, and the resistor sheet and the buffer sleeve will not vibrate or collide due to the tight fit, so vibration between the resistor sheet and the buffer sleeve can be prevented to prevent the resistor sheet from cracking, thereby making the product operation more stable and reliable.

[0021] In a basic embodiment, Figure 1 As shown, a plurality of resistors 2 are provided on the insulating rod 1, and the resistors 2 are sleeved on the outside of the insulating rod 1 along the axial direction of the insulating rod 1, and a buffer sleeve 3 is provided between the insulating rod 1 and the resistors 2, and the buffer sleeve 3 is provided along the circumferential direction of the insulating rod 1, and the buffer sleeve 3 includes an external lining 5 and an internal filling support 6, and the buffer sleeve 3 is wrapped around the outside of the insulating rod 1, and the inner wall of the buffer sleeve 3 is tightly fitted with the outer wall of the insulating rod 1, and the outer wall of the buffer sleeve 3 is tightly fitted with the inner hole wall of the resistor 2, and there is no gap between the insulating rod 1, the resistor 2 and the buffer sleeve 3, and the buffer sleeve 3 is not easy to deform during operation, and the resistor 2 and the buffer sleeve 3 will not vibrate or collide due to the tight fit, which can prevent the resistor 2 from cracking due to the collision between the resistor 2 and the buffer sleeve 3, and can extend the service life of the resistor 2 while ensuring the stability and reliability of the closing resistor during operation.

[0022] In a preferred embodiment, a conductive vibration damping sheet 4 is provided between two adjacent resistor sheets 2. The conductive vibration damping sheet 4 can reduce the friction between the two adjacent resistor sheets 2, reduce the wear of the resistor sheets 2, and extend the service life of the resistor sheets 2; the conductive vibration damping sheet 4 can also protect the resistor sheets 2 and reduce the vibration of the resistor sheets 2 during transportation and operation. The resistor sheets 2 are usually connected in series on the insulating pull rod 1. The conductive vibration damping sheet 4 is provided between the resistor sheets 2 to ensure the electrical connection between the resistor sheets 2. At the same time, each resistor sheet 2 may not be the same, and the resistance distribution of the resistor sheets 2 may not be uniform. The conductive vibration damping sheet 4 is provided between the resistor sheets 2 to ensure the overcurrent capacity of the resistor sheets 2 and to evenly distribute the current on each resistor sheet 2, so that the overall operation of the closing resistor is more stable and reliable. The presence of the conductive vibration damping sheet 4 can also improve the heat dissipation effect of the resistor sheets 2, so that the closing resistor can operate stably for a long time. In other embodiments, vibration-damping patterns for vibration reduction may be provided on the conductive vibration-damping sheets 4 disposed between the resistor sheets 2 , so that the conductive vibration-damping sheets 4 have a better vibration-damping effect, thereby providing better protection for the resistor sheets 2 .

[0023] In a preferred embodiment, the conductive vibration damping sheet 4 between the resistor sheets 2 is an aluminum foil sheet. The aluminum foil sheet has good electrical conductivity, which can make the current transmission between the resistor sheets 2 smoother and ensure better electrical conductivity between the resistor sheets 2. At the same time, the aluminum foil sheet has good corrosion resistance, which can ensure that the closing resistor can operate more stably when used in harsh environments. The use of aluminum foil can also make the electric field distribution around the resistor sheets 2 more uniform, protecting the resistor sheets 2 while allowing the resistor sheets 2 to work normally. The aluminum foil sheet has good thermal conductivity, and the aluminum foil sheet installed between the resistor sheets 2 can improve the heat dissipation performance of the resistor sheets 2. At the same time, since the cost of the aluminum foil sheet is relatively low, the use of the conductive vibration damping sheet 4 with the aluminum foil sheet can also reduce the cost of making the closing resistor.

[0024] In other embodiments, the conductive vibration damping sheet 4 can be made of a copper sheet. The copper sheet has better conductivity, and the current transmission between the resistor sheets 2 is smoother, making the current distribution on the resistor sheet 2 more uniform. At the same time, the copper sheet also has better corrosion resistance, so that the closing resistor can operate more stably and effectively when working in a harsh environment, thereby extending the service life of the closing resistor. The copper sheet also has excellent thermal conductivity. The copper sheet installed between the resistor sheets 2 can improve the heat dissipation performance of the resistor sheets 2 and extend the service life of the resistor sheets.

[0025] In a preferred embodiment, the insulating rod 1 is a hollow rod-shaped structure. The insulating rod 1 has a certain wall thickness so that the insulating rod 1 has sufficient strength. While ensuring the mechanical properties of the insulating rod 1, the hollow rod-shaped structure can reduce the weight of the insulating rod 1, making it easier to assemble the closing resistor and improving the tooling efficiency. At the same time, the use of the hollow rod-shaped structure can also reduce the production cost of the insulating rod 1, thereby reducing the production cost of the closing resistor.

[0026] In other embodiments, the insulating rod 1 can be a solid rod-shaped structure to ensure higher strength. Since the closing resistor is prone to vibrate during use, the use of a solid rod can prevent the insulating rod 1 from breaking and thus affecting the stable operation of the closing resistor. The insulating rod 1 can be a cylindrical solid rod. When the buffer sleeve 3 is installed on the insulating rod 1, it fits tightly with the insulating rod 1. Under long-term use of the closing resistor, the buffer sleeve 3 is not easy to deform, thereby extending the service life of the buffer sleeve 3; the insulating rod 1 can also be a flat solid rod. The buffer sleeve 3 is mounted on the insulating rod 1 to eliminate the processing error of the insulating rod 1. At the same time, the use of a flat rod can also reduce the production cost of the insulating rod 1; the insulating rod 1 can also be designed as a rod-shaped structure of other shapes. The shape of the insulating rod 1 is not restricted, and the insulating rod 1 can be designed in a diversified manner.

[0027] In a preferred embodiment, the buffer sleeve 3 is an integrated structure, and the length of the buffer sleeve 3 is not less than the length of the insulating rod 1, so that the buffer sleeve 3 can completely wrap the outer peripheral surface of the insulating rod 1, which can provide better protection for the insulating rod 1, making the insulating rod 1 less prone to damage, and extending the service life of the insulating rod 1. The resistor 2 is sleeved on the outside of the buffer sleeve 3, and the length of the buffer sleeve 3 is not less than the length of the insulating rod 1, which can provide buffer protection for all resistors 2, making the resistor 2 less prone to damage, and extending the service life of the resistor 2. In other embodiments, the length of the buffer sleeve 3 can be less than the length of the insulating rod, but it is necessary to ensure that the length of the buffer sleeve 3 is not less than the length of all resistors 2 stacked on the insulating rod 1, to ensure that the buffer sleeve 3 can protect all resistors 2, making the resistor 2 less prone to damage, extending the service life of the resistor 2, improving the quality of the product, and ensuring that the closing resistor can operate stably.

[0028] The specific operation steps of the method for manufacturing the closing resistor of the present invention are: First, clean the insulating rod 1. Figure 2 As shown, a flexible lining 5 is sleeved on the outside of the insulating rod 1, and a gap is left between the lining 5 and the insulating rod 1. The resistor 2 and the conductive vibration damping sheet 4 are sequentially assembled outside the lining 5. The conductive vibration damping sheet 4 is installed between two adjacent resistors 2. Figure 3As shown, a curable filling support 6 is injected into the gap between the insulating rod 1 and the lining 5, so that the filling support 6 fills the gap between the insulating rod 1 and the lining 5, and then the filling support 6 is cured under ambient temperature or high temperature conditions. At the same time, after the filling support 6 is cured, the insulating rod 1, the filling support 6, the lining 5 and the resistor 2 can be tightly fitted. After the filling support 6 is cured, it forms a buffer sleeve 3 with the lining 5. The buffer sleeve 3 is wrapped around the outside of the insulating rod 1, and the inner wall of the buffer sleeve 3 is tightly fitted with the outer wall of the insulating rod 1. The outer wall of the buffer sleeve 3 is tightly fitted with the inner hole wall of the resistor 2. There is no gap between the insulating rod 1, the resistor 2 and the buffer sleeve 3. During operation, the buffer sleeve 3 is not easy to deform. Due to the tight fit between the resistor 2 and the buffer sleeve 3, there will be no vibration or collision. The problem of cracking of the resistor 2 caused by a collision between the resistor 2 and the buffer sleeve 3 can be prevented, and the service life of the resistor 2 can be extended while ensuring the stability and reliability of the closing resistor during operation. The length of the lining 5 is not less than the length of the insulating rod 1. After the filling support 6 is injected between the insulating rod 1 and the lining 5, the filling support 6 can completely wrap the outer circumference of the insulating rod 1, which can provide better protection for the insulating rod 1; the length of the filling 6 after curing is greater than the length of the resistor 2 stacked on the insulating rod 1, so that the buffer sleeve 3 composed of the filling support 6 and the lining 5 can protect all the resistors 2, making the resistors 2 less likely to be damaged, thereby ensuring that the closing resistor of the present invention can operate stably and reliably.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A closing resistor, comprising an insulating pull rod, on which a plurality of resistor sheets are mounted along the axial direction of the insulating pull rod, characterized in that: A buffer sleeve is provided between the insulating rod and the resistor sheet, and the buffer sleeve includes an external lining layer and an internal filling support, the lining layer contacts the filling support, the filling support contacts the insulating rod, the buffer sleeve is wrapped around the outside of the insulating rod, the inner wall of the buffer sleeve is in contact with the outer peripheral surface of the insulating rod, and the outer wall of the buffer sleeve is in contact with the inner hole wall of the resistor sheet.

2. The closing resistor according to claim 1, characterized in that: A conductive vibration-damping sheet is arranged between two adjacent resistor sheets.

3. The closing resistor according to claim 2, characterized in that: The conductive vibration damping sheet is an aluminum foil sheet.

4. The closing resistor according to any one of claims 1 to 3, characterized in that: The insulating pull rod is a hollow rod-shaped structure.

5. The closing resistor according to any one of claims 1 to 3, characterized in that: The length of the buffer sleeve is not less than the length of the insulating pull rod.

6. A method for manufacturing a closing resistor, characterized in that: The method comprises the following steps: a flexible lining is coated on the outer sleeve of an insulating rod, a resistor sheet is coated on the outside of the lining, a curable filling support is injected between the insulating rod and the lining, and the filling support is cured under ambient temperature or high temperature conditions. The lining and the filling support constitute a buffer sleeve, and the buffer sleeve is wrapped around the outside of the insulating rod. The inner wall of the buffer sleeve fits with the outer peripheral surface of the insulating rod, and the outer wall of the buffer sleeve fits with the inner hole wall of the resistor sheet.

7. The method for manufacturing a closing resistor according to claim 6, characterized in that: A conductive vibration-damping sheet is arranged between two adjacent resistor sheets.

8. The method for manufacturing a closing resistor according to claim 7, characterized in that: The conductive vibration damping sheet is an aluminum foil sheet.

9. The method for manufacturing a closing resistor according to any one of claims 6 to 8, characterized in that: The insulating pull rod is a hollow rod-shaped structure.

10. The method for manufacturing a closing resistor according to any one of claims 6 to 8, characterized in that: The length of the buffer sleeve is not less than the length of the insulating pull rod.

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