Metal-supported strip-shaped off-circuit tap-changer moving contact and installation method

Abstract

The invention provides a metal-supported strip-shaped off-circuit tap-changer moving contact and an installation method, the metal-supported strip-shaped off-circuit tap-changer moving contact comprises a moving contact body, an installation frame and a transmission member, the installation frame comprises an outer insulation support frame and an inner metal support member, the inner metal support member is attached to the inner wall of the outer insulation support frame, and the moving contact body is embedded in an inner cavity of the metal support member. The moving contact group electrified body and the external electrified body can form insulation isolation between the moving contact group electrified body and the external electrified body, and the insulation strength is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of transformer tap changers, and particularly relates to a metal-supported strip-shaped non-magnetic tap changer moving contact and a mounting method. BACKGROUND

[0002] The strip-shaped non-magnetic tap changer has been widely applied in transformer voltage regulation due to simple manufacturing, small size and low cost. However, the moving contact is supported by a metal body, which causes the size of the moving contact group to be large and the electric field to be poor, and it is difficult to apply the strip-shaped non-magnetic tap changer to a high-voltage power transformer. If an insulating part is used to support the moving contact, the insulating part can only support a small amount of moving contacts due to poor strength, which causes the tap changer to be unable to adapt to the requirement of large current. Therefore, the previous strip-shaped non-magnetic tap changer can only be used in small-capacity and low-voltage power transformers. For example, a non-magnetic linear voltage-regulating strip-shaped tap changer disclosed in Chinese Patent CN2879372Y has a metal material processing for the screw sleeve and the support part for supporting the moving contact. When the moving contact is in the working position, the support part and the screw sleeve are subjected to the elastic force of the moving contact spring. If an insulating material is used, the support part and the screw sleeve will be deformed or even broken outwardly under the elastic force, especially in the high-temperature environment during the operation of the transformer, which seriously affects the safe operation of the transformer. SUMMARY

[0003] The application aims to solve the above problems, and provides a metal-supported strip-shaped non-magnetic tap changer moving contact and a mounting method, which have high strength, small live body and strong current-carrying capacity, and meet the voltage-regulating requirements of medium and large power transformers.

[0004] The embodiment of the application is implemented as follows: The embodiment of the application provides a metal-supported strip-shaped non-magnetic tap changer moving contact, which is characterized by comprising a moving contact body, a mounting frame and a transmission part. The mounting frame comprises an outer insulating support frame and an inner metal support part. The inner metal support part is arranged on the inner wall of the outer insulating support frame. The moving contact body is embedded in the internal cavity of the metal support part and is elastically connected by an elastic part, and is floatingly connected between two adjacent static contacts. The outer insulating support frame is fixed on the transmission part.

[0005] In some optional embodiments, the outer insulating support frame is made of an insulating material, one end of which is connected with the transmission part, and the other end is a U-shaped frame body. The inner metal support part is arranged in the U-shaped frame body.

[0006] In some optional embodiments, the inner metal support part is a U-shaped block body made of a metal material, which is connected with the outer insulating support frame by a screw. The moving contact body is symmetrically arranged on the two side walls of the inner metal support part.

[0007] In some alternative embodiments, the inner metal support is chamfered at the corners.

[0008] In some alternative embodiments, the movable contact body is a clip-type movable contact, and a plurality of clip-type movable contacts are arranged in parallel.

[0009] In some alternative embodiments, the clip-type movable contact is connected to the inner metal support by a rivet, and a spring is sleeved on the rivet, with both ends of the spring abutting against the inner metal support and the clip-type movable contact.

[0010] In some alternative embodiments, a guide groove is arranged on the two side walls of the inner metal support, and a spring is arranged in the guide groove, with both ends of the spring connected to the clip-type movable contact and the guide groove. A waist-shaped hole is arranged on the clip-type movable contact, and a corresponding hole is arranged on the inner metal support. A pin shaft passes through the waist-shaped hole and the hole, and both ends of the pin shaft are fixed by riveting. The two side walls of the inner metal support are divided into a plurality of installation cavities by a partition plate, and the clip-type movable contact is embedded in the installation cavities.

[0011] In some alternative embodiments, the transmission member is a lead screw, and the lead screw passes through the outer insulation support frame to drive the outer insulation support frame to move along the axial direction of the lead screw.

[0012] In some alternative embodiments, the inner end surface of the clip-type movable contact is a structure with convex sides and a concave middle.

[0013] A mounting method of a metal-supported strip-shaped non-magnetic tap switch movable contact, characterized in that the method comprises the following steps: The inner metal support is attached to the inner wall of the outer insulation support frame and fastened by a screw. A plurality of clip-type movable contacts are arranged in parallel and riveted to the inner metal support by a pin shaft. The top of the clip-type movable contact is connected to a spring arranged in a guide groove on the inner metal support, forming a floating connection. Alternatively, the clip-type movable contact is connected to the inner metal support by a rivet, and a spring is sleeved on the rivet, forming a floating connection.

[0014] The metal-supported strip-shaped non-magnetic tap switch movable contact and the mounting method provided by the present application have the following advantages. The outer insulation support frame and the inner metal support are combined to form a frame structure. The inner metal support can ensure that multiple pairs of movable contact springs do not deform under spring force, improving the current carrying capacity. On the premise of ensuring the structural strength of the movable contact, the requirements of large current can be met. The outer insulation support frame reduces the width of the movable contact group, effectively improving the insulation level of the switch. At the same time, the outer insulation support frame completely covers the outside of the inner metal support, forming an insulating isolation between the movable contact live body and the external live body, further improving the insulation strength. BRIEF DESCRIPTION OF DRAWINGS

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the strip tap changer in the embodiments of this application; Figure 2 for Figure 1 AA view; Figure 3 for Figure 2 BB view; Figure 4 This is a schematic diagram showing the installation of the moving contact in the width direction as the working surface in an embodiment of this application. Figure 5 for Figure 4 The CC view. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] It should be understood that the sequence number of each step in the embodiment does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0020] 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.

[0021] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0022] like Figures 1-3 As shown, the moving contact of a metal-supported strip-shaped non-excitation tap changer provided in this embodiment includes a moving contact body 1, a mounting frame 2, and a transmission component 3. The mounting frame includes an outer insulating support frame 21 and an inner metal support component 22. The inner metal support component is fitted to the inner wall of the outer insulating support frame. The moving contact body is embedded in the internal cavity of the metal support component and is elastically connected by an elastic component, floating across two adjacent stationary contacts 4. The outer insulating support frame is fixed on the transmission component.

[0023] The inner metal support is made of metal and bears the elastic force of the elastic element, ensuring stable and reliable contact pressure of the moving contact. The outer insulating support frame is made of insulating material, which reduces the width of the live part of the moving contact and effectively improves the insulation level of the switch. The outer insulating support frame completely covers the outside of the inner metal support, forming an insulating barrier between the live part of the moving contact and the external live part, thus improving the insulation strength.

[0024] Furthermore, the outer insulating support frame is made of insulating material, with one end connected to the transmission component and the other end being a U-shaped frame, and the inner metal support component is installed inside the U-shaped frame.

[0025] Furthermore, the inner metal support is a U-shaped block made of metal material, which is connected to the outer insulating support frame by screws 221. The moving contact body is symmetrically arranged on the two side walls of the inner metal support, and the moving contact body connected to the two side walls is in contact with the two sides of the stationary contact.

[0026] In this embodiment, the chamfers of the inner metal support are all rounded, making the outer electrode smooth and further improving the insulation performance.

[0027] Furthermore, the transmission component is a lead screw, which is mounted on the outer insulating support frame. The operating mechanism drives the lead screw to rotate, which in turn drives the outer insulating support frame to move along the axial direction of the lead screw.

[0028] Of course, the transmission component can also be a gear and rack mechanism, with the rack fixedly connected to the moving contact mounting bracket, the gear connected to the operating mechanism, and the gear rotating to drive the moving contact mounting bracket to move by meshing the gear and rack; or a slotted bar and shift fork mechanism can be used, with the slotted bar fixedly connected to the moving contact mounting bracket, and the shift fork connected to the operating mechanism, and the shift fork rotating to drive the slotted bar to move.

[0029] In practical use, the moving contact floats across two adjacent stationary contacts. When the tap changer changes gears, the tap changer's operating mechanism drives the transmission components. The screw rotates, causing the moving contact mounting bracket to move along the screw, or the gear rotates, causing the rack and moving contact mounting bracket to move, thus achieving gear changing.

[0030] In this embodiment, the moving contact body is a clip-on moving contact, and multiple clip-on moving contacts are arranged in parallel. The inner end face of the clip-on moving contact has a structure with convex sides and concave middle, which increases the operating feel when shifting gears.

[0031] Furthermore, the clip-type moving contact is connected to the inner metal support via rivets 222. A spring 223 is fitted over the rivet, with both ends of the spring abutting against the inner metal support and the clip-type moving contact, respectively. During tap change, the spring extends and retracts as the moving contact moves up and down, causing the clip-type moving contact to move along the rivet.

[0032] In the second embodiment of the present invention, guide grooves 224 are provided on both sides of the inner metal support, and springs are installed in the guide grooves. The two ends of the springs are respectively connected to the clamp-type moving contact and the guide groove. The clamp-type moving contact is provided with an oblong hole 225, and the inner metal support is provided with a corresponding round hole. The pin 226 passes through the oblong hole and the round hole, and the two ends are riveted and fixed. The two sides of the inner metal support are divided into multiple mounting cavities by partitions 227. The clamp-type moving contact is embedded in the mounting cavity to avoid tilting and shaking.

[0033] The installation of the moving contact of the above-mentioned bar-shaped non-energized tap changer includes the following process: The inner metal support fits against the inner wall of the outer insulating support frame and is fastened with screws. When the thickness-direction surface of the clip-type moving contact is used as the working surface, multiple clip-type moving contacts are connected in parallel and riveted to the inner metal support via pins. The top of the clip-type moving contact is connected to a spring installed in a guide groove on the inner metal support, forming a floating connection. When the width-direction surface of the clip-type moving contact is used as the working surface, the clip-type moving contact is connected to the inner metal support via rivets, with the rivets fitted with springs (see...). Figure 4 , Figure 5 ), forming a floating connection.

Claims

1. A metal-supported strip-shaped non-magnetic tap changer moving contact, characterized in that, The device includes a moving contact body, a mounting frame, and a transmission component. The mounting frame includes an outer insulating support frame and an inner metal support component. The inner metal support component is fitted to the inner wall of the outer insulating support frame. The moving contact body is embedded in the internal cavity of the metal support component and is elastically connected by an elastic element, floating across two adjacent stationary contacts. The outer insulating support frame is fixed to the transmission component.

2. The metal-supported strip-shaped non-magnetic tap changer moving contact according to claim 1, characterized in that, The outer insulating support frame is made of insulating material, with one end connected to the transmission component and the other end being a U-shaped frame. The inner metal support component is installed inside the U-shaped frame.

3. The moving contact of a metal-supported strip-shaped non-magnetic tap changer according to claim 2, characterized in that, The inner metal support is a U-shaped block made of metal material, which is connected to the outer insulating support frame by screws. The moving contact body is symmetrically arranged on both sides of the inner metal support.

4. The metal-supported strip-shaped non-magnetic tap changer moving contact according to claim 3, characterized in that, All chamfers of the inner metal support are rounded.

5. The metal-supported strip-shaped non-magnetic tap changer moving contact according to claim 4, characterized in that, The moving contact body is a clip-on type moving contact, and multiple clip-on moving contacts are arranged in parallel.

6. The metal-supported strip-shaped non-magnetic tap changer moving contact according to claim 5, characterized in that, The clamp-type moving contact is connected to the inner metal support by rivets. A spring is installed on the outer sleeve of the rivet, and the two ends of the spring abut against the inner metal support and the clamp-type moving contact, respectively.

7. The metal-supported strip-shaped non-magnetic tap changer moving contact according to claim 5, characterized in that, The inner metal support has guide grooves on both sides, and springs are installed in the guide grooves. The two ends of the springs are respectively connected to the clip-type moving contact and the guide groove. The clip-type moving contact has an oval hole, and the inner metal support has a corresponding round hole. The pin passes through the oval hole and the round hole, and the two ends are riveted. The two sides of the inner metal support are divided into multiple mounting cavities by partitions, and the clip-type moving contact is embedded in the mounting cavity.

8. A metal-supported strip-shaped non-magnetic tap changer moving contact according to claim 6 or 7, characterized in that, The transmission component is a lead screw, which passes through the outer insulating support frame and drives the outer insulating support frame to move along the axial direction of the lead screw.

9. A metal-supported strip-shaped non-magnetic tap changer moving contact according to claim 6 or 7, characterized in that, The inner end face of the clamp-type moving contact has a structure with convex sides and concave center.

10. The method for installing the moving contact of a metal-supported strip-shaped non-excitation tap changer as described in claim 6, characterized in that, Includes the following: The inner metal support fits against the inner wall of the outer insulating support frame and is fastened by screws. Multiple clip-type moving contacts are connected in parallel and riveted to the inner metal support by pins. The top of the clip-type moving contacts is connected to a spring installed in a guide groove on the inner metal support to form a floating connection; or, the clip-type moving contacts are connected to the inner metal support by rivets, with the rivets fitted with springs to form a floating connection.

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