A clip current carrying contact structure and a tap changer

Abstract

This utility model discloses a clamp-on current-carrying contact structure and tap changer, including a contact seat with a mounting hole in the middle; pressure plates are detachably fixed on the left and right sides of the contact seat; an oil chamber contact is detachably fixed in the mounting hole, and a gap space is formed between the left and right side walls of the oil chamber contact and the inner wall of the mounting hole, with the head end of the oil chamber contact extending above the contact seat; several clamping members are provided on the left and right sides of the oil chamber contact, each clamping member including a clamp-on contact and a spring; the clamp-on contact is slidably installed in the gap space on the same side, with the clamping end of the clamp-on contact extending below the contact seat; the spring is arranged between the pressure plate and the clamp-on contact on the same side, with one end abutting against the clamp-on contact and the other end passing through a pre-set positioning hole on the contact seat and abutting against the pressure plate on the same side. This utility model has a compact structure, occupies little space, and has a simple manufacturing process; when arranged on the oil chamber, the number can be increased to meet the needs of single-phase and three-phase current carrying conditions.

Description

Technical Field

[0001] This utility model relates to the field of tap changer technology, specifically to a clip-on current-carrying contact structure and a tap changer. Background Technology

[0002] Currently, the commonly used current-carrying contact structures for tap changers are mainly push-button contact and clip-on contact. When using push-button contact, especially when the switch has a large height, high current carrying capacity, and numerous contact points, jamming and contact damage can easily occur when the switch core is hoisted into the oil chamber due to the lack of guidance between the push-button contact and the limited radial space, leading to assembly quality issues. Clip-on contact structures can effectively solve this problem, but currently used clip-on current-carrying contact structures are not compact enough, occupy a large amount of space, have a cumbersome manufacturing process, and are very restrictive in the limited space between the switch core and the oil chamber, resulting in higher operating costs. Therefore, it is necessary to develop a new type of clip-on current-carrying contact structure. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a clip-on current-carrying contact structure and tap changer, thereby solving the quality problems of jamming and contact damage that easily occur in existing push-to-contact current-carrying contact structures when the switch height is large, the current carrying capacity is large, and there are many contact points. At the same time, it also solves the problems of existing clip-on current-carrying contact structures being not compact enough, occupying a large space, and having a cumbersome manufacturing process, thereby improving production efficiency and enhancing the overall performance of the product.

[0004] The objective of this utility model is achieved through the following technical solution: A clamp-on current-carrying contact structure includes a contact seat with a mounting hole in the middle; pressure plates are detachably fixed on the left and right sides of the contact seat; an oil chamber contact is detachably fixed in the mounting hole (i.e., the front and rear side walls of the oil chamber contact are detachably fixed to the contact seat), and a gap space is formed between the left and right side walls of the oil chamber contact and the inner wall of the mounting hole (located on its left and right sides), and the head end of the oil chamber contact extends to the top of the contact seat; a plurality of clamping members are provided on the left and right sides of the oil chamber contact, each clamping member including a clamp contact and a spring; the clamp contact is slidably installed in the gap space on the same side, and the clamping end of the clamp contact extends to the bottom of the contact seat; the spring is disposed between the pressure plate and the clamp contact on the same side, one end of which abuts against the clamp contact, and the other end passes through a preset positioning hole on the contact seat and abuts against the pressure plate on the same side.

[0005] An embodiment of this utility model also provides a tap changer, including an oil chamber, a switch core sleeved inside the oil chamber, and a plurality of contact pieces arranged circumferentially on the outer wall of an arc-shaped plate outside the switch core. The contact pieces are arranged vertically. The feature is that it further includes a plurality of clamping current-carrying contact structures as described in any one of claims 1-5. The clamping current-carrying contact structures correspond one-to-one with the contact pieces. The contact seat of each clamping current-carrying contact structure is installed on the inner wall of the oil chamber. The head end of its oil chamber contact penetrates the oil chamber and extends to the outer side of the oil chamber and is locked on the oil chamber by a locking device. The clamping ends of all its clamping members are located inside the oil chamber and are vertically clamped on both sides of the corresponding contact piece.

[0006] An embodiment of this utility model also provides a tap changer, in which one of the clip-on current-carrying contact structures can be set as two layers in the vertical direction, which can meet the single-phase current carrying capacity of 1250A. The two layers of clip-on current-carrying contact structures correspond one-to-one and are aligned vertically, and the clamping parts of the two corresponding current-carrying contact structures are vertically clamped on both sides of the same corresponding contact piece.

[0007] The beneficial effects of this utility model are as follows: This invention features a lever structure where the clamping contacts are embedded in the contact seat and then contact the oil chamber contact under the action of a spring. The clamping ends of the clamping contacts on both sides of the oil chamber contact vertically clamp the contact plate from both sides. While meeting the current-carrying capacity requirements, this also provides a guiding effect during core lifting, preventing jamming or damage to the contacts. Compared to previous clamping-type current-carrying contact structures, this invention has a compact structure, occupies less space, and has a simpler manufacturing process. The increased number of contacts arranged on the oil chamber allows it to meet various current-carrying conditions, including single-phase and three-phase applications. Attached Figure Description

[0008] The present invention will now be described in further detail with reference to the accompanying drawings.

[0009] Figure 1 This is a front view of the clip-on current-carrying contact structure described in Embodiment 1 of this utility model.

[0010] Figure 2 for Figure 1 A cross-sectional view along the AA direction.

[0011] Figure 3 This is a top view of the clip-on current-carrying contact structure described in Embodiment 1 of this utility model.

[0012] Figure 4 for Figure 3 A cross-sectional view along the BB direction.

[0013] Figure 5 This is a schematic diagram of the tap changer structure described in Embodiment 2 of this utility model.

[0014] Figure 6 for Figure 5 A magnified view of a portion of the current-carrying contact structure of one of the clips.

[0015] Figure 7 This is a schematic diagram of the installation of the clip-on current-carrying contact structure in the tap changer described in Embodiment 3 of this utility model. The figure shows: 1-oil chamber, 2-switch core, 3-nut, 4-pressure ring, 5-washer, 6-clamping current-carrying contact structure, 61-contact seat, 62-bolt, 63-screw, 64-mounting hole, 65-pressure plate, 66-spring, 67-elastic pin one, 68-elastic pin two, 69-oil chamber contact, 610-clamping contact, 7-elastic sealing ring, 8-contact plate. Detailed Implementation

[0016] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. The described embodiments are merely some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example 1

[0019] like Figure 1and Figure 4 As shown, this embodiment provides a clamping current-carrying contact structure, including a contact seat 61, a pressure plate 65, an oil chamber contact 69, and a clamping member.

[0020] The contact seat 61 is a square plate that serves as a support for the clamp current-carrying contact structure. It has a square mounting hole 64 in the middle and three positioning holes on the left and right sides of the contact seat 61 (three positioning holes on the left and three on the right, with the positioning holes on the left corresponding to the three positioning holes on the right). The positioning holes penetrate the inside and outside of the contact seat 61 (connecting the outside of the contact seat 61 to the mounting hole 64).

[0021] There are two pressure plates 65, which are used to fix the spring 66 and provide preload. The two pressure plates 65 are detachably fixed to the left and right sides of the contact seat 61 by two screws 63. The inner side of the pressure plate 65 is machined with a circular groove that is aligned with the positioning hole on the same side. The circular groove is used to position one end of the spring 66 to ensure that the pressure direction is stable.

[0022] The oil chamber contact 69 is detachably fixed within the mounting hole 64 (the oil chamber contact 69 is embedded within the mounting hole 64, serving as the core conductive component, connecting the internal and external circuits of the oil chamber 1; the front and rear sidewalls of the oil chamber contact 69 contact the front and rear sidewalls of the mounting hole 64, while its left and right sidewalls do not contact the left and right sidewalls of the mounting hole 64; the rear side of the oil chamber contact 69 is fixedly connected to the rear sidewall of the contact seat 61 by bolts 62, and the front side of the oil chamber contact 69 is mounted and positioned on the front sidewall of the contact seat 61 by two elastic pins 67). A gap space is formed between the left and right sidewalls of the oil chamber contact 69 and the inner wall of the mounting hole 64 (located on its left and right sides) for the sliding of the clip contact 610. The head end of the oil chamber contact 69 extends upwards above the contact seat 61. The distance between the left and right sides of the oil chamber contact 69 located inside the mounting hole 64 gradually decreases from top to bottom, meaning that both left and right sides of the oil chamber contact 69 are inclined surfaces.

[0023] The number of clamping components is six, with three clamping components on each of the left and right sides of the oil chamber contact 69. Each clamping component includes a clamping contact 610 and a spring 66.

[0024] The clamping contact 610 is slidably mounted in the gap space on the same side as it, used to clamp the contact piece 8 of the switch core 2 to achieve current-carrying contact. It also forms a lever structure in conjunction with the spring 66. The clamping end of the clamping contact 610 extends downwards below the contact seat 61. Each clamping contact 610 corresponds one-to-one with the positioning holes on its corresponding side. A groove for positioning the spring 66 is provided on the side of the clamping contact 610 facing the corresponding positioning hole. The clamping members on the left and right sides of the oil chamber contact 69 correspond one-to-one. In each pair of clamping members, a clamping part is formed between the clamping ends of the two clamping contacts 610. There are three sets of clamping members on each side, forming three pairs of clamping parts, simultaneously clamping the same contact piece 8. In each pair of clamping components, the opposing surfaces of the two clamping contacts 610 are arc-shaped convex surfaces, providing guidance and self-adaptive clamping. When the switch core 2 is hoisted, the arc-shaped convex surfaces of the clamping contacts 610 guide the contact pieces 8 to slide into the clamping part, avoiding jamming or damage to the contacts.

[0025] The spring 66 is disposed between the pressure plate 65 and the clamping contact 610 on the same side, and is used to provide clamping force and buffer vibration. One end of the spring 66 abuts against a preset groove on the clamping contact 610, and the other end passes through a preset positioning hole on the contact seat 61 and abuts against a preset groove on the pressure plate 65 on the same side. The spring 66 provides contact pressure between the clamping contact 610 and the oil chamber contact 69 and positions the clamping contact 610; when the clamping contact 610 contacts the side of the outer contact piece 8 of the switch core 2, the spring 66 is compressed. After being compressed, the spring 66 pushes the clamping contact 610 toward the oil chamber contact 69 in the opposite direction, forming contact pressure. Example 2

[0026] like Figure 5 and Figure 6As shown, this embodiment also provides a tap changer, including an oil chamber 1, a switch core 2 sleeved inside the oil chamber 1, and six contact pieces 8 arranged circumferentially on the outer wall of the arc-shaped plate outside the switch core 2. The contact pieces 8 are arranged vertically. It also includes six clamp-on current-carrying contact structures 6 as described in Embodiment 1. The clamp-on current-carrying contact structures 6 correspond one-to-one with the contact pieces 8. The contact seat 61 of each clamp-on current-carrying contact structure 6 is installed on the inner wall of the oil chamber 1 (the contact seat 61 cooperates with a pre-set countersunk hole on the oil chamber 1 through an elastic pin 68 to prevent the entire clamp from carrying current). (The contact structure 6 rotates). The head end of the oil chamber contact 69 of each clamp current-carrying contact structure 6 penetrates the oil chamber 1 and extends to the outside of the oil chamber 1 and is locked onto the oil chamber 1 by a locking device. The head end of the oil chamber contact 69 is rod-shaped and has external threads. The clamping ends of all clamping members (clamping ends of clamping contacts 610) of each clamp current-carrying contact structure 6 are located inside the oil chamber and are vertically clamped on both sides of the corresponding contact piece 8 (a clamping part is formed between the clamping ends of each pair of clamping members. The clamping parts of the three pairs of clamping members in the clamp current-carrying contact structure 6 are aligned vertically and are all clamped on both sides of the corresponding contact piece 8). The locking device includes a pressure ring 4, a washer 5, and a nut 3. The nut 3 is threaded onto a pre-set external thread on the head end of the oil chamber contact 69 and contacts the outer wall of the oil chamber 1. The diameter of the threaded connection between the oil chamber contact 69 and the nut 3 is larger than the diameter of the threaded connection between the oil chamber contact 69 and the pressure ring 4. The washer 5 is sleeved on the head end of the oil chamber contact 69. The pressure ring 4 is threaded onto the pre-set external thread on the head end of the oil chamber contact 69 and presses the washer 5 onto the nut 3. An elastic sealing ring 7 is sleeved on the head end of the oil chamber contact 69, located between the oil chamber and the oil chamber contact, to ensure the sealing of the oil chamber 1.

[0027] During installation, the switch core 2 is hoisted downwards into the oil chamber 1 from above. As the switch core 2 moves downwards, the vertically arranged contact pieces 8 on the outer side wall of the arc-shaped plate of the switch core 2 are aligned with the middle of the clamping part of each clamping current-carrying contact structure 6. Then, it is lowered so that the contact pieces 8 slide down into the clamping parts of the corresponding clamping current-carrying contact structures 6, thus completing the installation. Since the inner side of the clamping contact 610 is arc-shaped, it can play a guiding role, guiding the contact pieces 8 between each pair of clamping contacts 610 of the clamping member. Thus, under the action of the spring 66, the clamping part of the clamping contact 610 in each pair of clamping members maintains reliable contact with the contact pieces 8. Example 3

[0028] The embodiments of this utility model also provide a tap changer. Based on the structure of embodiment 2, one of the clamping current-carrying contact structures 6 can be set as two layers in the vertical direction, which can meet the single-phase current carrying capacity of 1250A. The two layers of clamping current-carrying contact structures 6 correspond one-to-one and are aligned vertically. The clamping parts of the two corresponding current-carrying contact structures 6 are vertically clamped on both sides of the same corresponding contact piece.

[0029] Other aspects of this utility model that are not detailed herein are all conventional techniques known to those skilled in the art.

[0030] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] The scope of protection of this utility model is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this utility model shall fall within the scope of protection of this utility model.

Claims

1. A clip-on current-carrying contact structure, characterized in that, The device includes a contact seat with a mounting hole in the middle; pressure plates are detachably fixed on the left and right sides of the contact seat; an oil chamber contact is detachably fixed in the mounting hole, and a gap space is formed between the left and right side walls of the oil chamber contact and the inner wall of the mounting hole, with the head end of the oil chamber contact extending above the contact seat; several clamping members are provided on the left and right sides of the oil chamber contact, each clamping member including a clamping contact and a spring; the clamping contact is slidably installed in the gap space on the same side, with the clamping end of the clamping contact extending below the contact seat; the spring is disposed between the pressure plate and the clamping contact on the same side, with one end abutting against the clamping contact and the other end passing through a pre-set positioning hole on the contact seat and abutting against the pressure plate on the same side.

2. The clip-on current-carrying contact structure according to claim 1, characterized in that: The clamping parts on the left and right sides of the oil chamber contact are one-to-one. In each pair of clamping parts, a clamping part is formed between the clamping ends of the two clamping plates.

3. The clip-on current-carrying contact structure according to claim 2, characterized in that: The oil chamber contact has three clamping members on each of its left and right sides.

4. The clip-on current-carrying contact structure according to claim 2, characterized in that: In each pair of clamping components, the opposing surfaces of the two clamping contacts are arc-shaped convex surfaces.

5. The clip-on current-carrying contact structure according to claim 1, characterized in that: The two ends of the spring respectively abut against the clip contact and the preset groove on the pressure plate.

6. A tap changer, comprising an oil chamber, a switch core sleeved within the oil chamber, and a plurality of contact pieces arranged circumferentially on the outer wall of an arc-shaped plate outside the switch core, the contact pieces being vertically arranged, characterized in that: It also includes several clamp-on current-carrying contact structures as described in any one of claims 1-5, wherein each clamp-on current-carrying contact structure corresponds one-to-one with the contact piece, the contact seat of each clamp-on current-carrying contact structure is installed on the inner wall of the oil chamber, the head end of its oil chamber contact penetrates the oil chamber and extends to the outer side of the oil chamber and is locked on the oil chamber by a locking device, and the clamping ends of all its clamping members are located inside the oil chamber and are vertically clamped on both sides of the corresponding contact piece.

7. The tap changer according to claim 6, characterized in that: One of the clamp-on current-carrying contact structures is configured as two layers in the vertical direction, with the two layers of clamp-on current-carrying contact structures corresponding one to one and aligned vertically. The clamping parts of the two corresponding current-carrying contact structures are vertically clamped on both sides of the same corresponding contact piece.

8. The tap changer according to claim 6, characterized in that: The oil chamber contact is fitted with an elastic sealing ring at its head end, located between the oil chamber and the oil chamber contact.

9. The tap changer according to claim 6, characterized in that: The locking device includes a pressure ring, a washer, and a nut; the nut is threaded onto a pre-set external thread on the outer end of the oil chamber contact and contacts the outer wall of the oil chamber; the washer is sleeved on the outer end of the oil chamber contact; the pressure ring is threaded onto a pre-set external thread on the outer end of the oil chamber contact and presses the washer onto the nut.

10. The tap changer according to claim 9, characterized in that: The diameter of the threaded connection between the oil chamber contact and the nut is larger than the diameter of the threaded connection between the oil chamber contact and the pressure ring.

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