A contact device and switch
By using reverse-stacked L-shaped contact assemblies in fuse-type disconnect switches, the problems of high contact device cost and large switch size are solved, thereby increasing current carrying capacity and miniaturizing the switch, while reducing contact resistance and production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG TENGEN ELECTRIC
- Filing Date
- 2025-07-04
- Publication Date
- 2026-06-23
AI Technical Summary
The contact device of existing fuse-type disconnect switches increases the number of contacts and contact area to meet high current carrying capacity requirements, which leads to an increase in the length of the copper busbar, increases production costs, and increases the size of the switch.
The L-shaped contact assembly with reverse stacking includes first and second L-shaped contacts, which are fixed to the conductive plate by fasteners and clamped by elastic arms and retaining rings. This increases the number of contacts, reduces contact resistance, and sets a limit block to limit the insertion depth of the fuse knife switch.
With the same conductive plate length, the number of contacts is doubled, increasing current carrying capacity, reducing contact resistance, ensuring miniaturization of the switch, and reducing production costs.
Smart Images
Figure CN224400238U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of low-voltage electrical technology, specifically to a contact device and a switch. Background Technology
[0002] A fuse-type disconnect switch is an electrical protection device that integrates the functions of a disconnect switch and a fuse. It is mainly used in low-voltage power distribution systems to achieve manual opening and closing control of the circuit, electrical isolation, and overload and short-circuit protection.
[0003] The contact device of the existing fuse-type disconnect switch includes a conductive plate and multiple L-shaped contacts that are spaced apart along the length of the conductive plate and arranged in the same direction. In order to meet the high current carrying capacity requirements, the conductive plate needs to be extended to increase the number of contacts and the contact area, which leads to a significant increase in the length of the copper busbar. This not only increases the production cost, but also increases the size of the switch. Utility Model Content
[0004] Therefore, the technical problem to be solved by this utility model is to overcome the high cost of copper busbars in the prior art, thereby providing a contact device and switch with low production cost.
[0005] Therefore, this utility model provides a contact device, including a conductive plate and at least one set of contact assemblies disposed on the conductive plate. The contact assembly includes: a first L-shaped contact having a first horizontal plate portion and a first vertical plate portion that are bent and connected; and a second L-shaped contact, which is disposed opposite to the first L-shaped contact and has a second horizontal plate portion and a second vertical plate portion that are bent and connected, wherein the second horizontal plate portion is stacked and fixed above the first horizontal plate portion.
[0006] The second horizontal plate portion and the first horizontal plate portion are fixed to the conductive plate by the same fastener.
[0007] Both the first vertical plate portion and the second vertical plate portion include two oppositely arranged contact plates and elastic arms that are bent and connected to the contact plates, with a slot formed between the two elastic arms.
[0008] It also includes retaining rings for clamping the two elastic arms.
[0009] The outer side of the elastic arm is provided with a positioning groove that abuts against the end of the retaining ring.
[0010] One of the contact plates has a limiting block extending toward the opposite contact plate at its lower center.
[0011] The contact assembly has two sets.
[0012] This utility model also provides a switch, including the contact device described above.
[0013] The technical solution of this utility model has the following advantages:
[0014] 1. The contact device provided by this utility model achieves a doubling of the number of contacts with the same conductive plate length by using two L-shaped contacts stacked in opposite directions. This not only increases the current carrying capacity but also reduces the contact resistance. In addition, compared with the prior art, it can ensure the miniaturization of the switch.
[0015] 2. The contact device provided by this utility model can constrain the position of the snap ring's action point and ensure the symmetry of the force on the double elastic arms.
[0016] 3. The contact device provided by this utility model can limit the insertion depth of the fuse knife switch by setting a limiting block, so as to prevent it from hitting the conductive plate body. Attached Figure Description
[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 This is a perspective view of the switch of this utility model;
[0019] Figure 2 This is a three-dimensional view of the contact device;
[0020] Figure 3 This is a front view of the contact device;
[0021] Figure 4 This is a 3D view of the contact assembly;
[0022] Figure 5 This is a schematic diagram of the exploded structure of the contact assembly.
[0023] Explanation of reference numerals in the attached drawings: 1. Conductive plate; 2. Contact assembly; 3. First L-shaped contact; 4. First horizontal plate; 5. First vertical plate; 6. Second L-shaped contact; 7. Second horizontal plate; 8. Second vertical plate; 9. Contact plate; 10. Elastic arm; 11. Snap ring; 12. Positioning groove; 13. Limiting block. Detailed Implementation
[0024] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0027] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0028] Example
[0029] This embodiment provides a switch, including a contact device, such as... Figure 1 and Figure 2 As shown, the contact device includes a conductive plate 1 and two sets of contact assemblies 2 disposed on the conductive plate 1.
[0030] The contact assembly 2, such as Figure 2 , Figure 3 and Figure 4As shown, it includes a first L-shaped contact 3 and a second L-shaped contact 6. The first L-shaped contact 3 has a first horizontal plate portion 4 and a first vertical plate portion 5 that are bent and connected. The second L-shaped contact 6 is arranged in the opposite direction to the first L-shaped contact 3. It has a second horizontal plate portion 7 and a second vertical plate portion 8 that are bent and connected. The second horizontal plate portion 7 is stacked and fixed above the first horizontal plate portion 4. The second horizontal plate portion 7 and the first horizontal plate portion 4 are fixed to the conductive plate 1 by the same fastener. In this embodiment, the fastener is a bolt.
[0031] like Figure 5 As shown, both the first vertical plate portion 5 and the second vertical plate portion 8 include two opposing contact plates 9 and elastic arms 10 bent and connected to the contact plates 9. A slot is formed between the two elastic arms 10, and a positioning groove 12 is provided on the outer side of the elastic arm 10, which abuts against the end of the retaining ring 11. The retaining ring 11 is used to clamp the two elastic arms 10 to the fuse knife switch. A limiting block 13 is provided in the lower middle part of one of the contact plates 9, extending towards the opposite contact plate 9.
[0032] It should be noted that the number of contact assemblies 2 can be 2, 3, 4 or more, which can be flexibly selected according to actual needs. The above-mentioned contact device can be used in disconnect switches as well as other switches.
[0033] The contact device provided by this utility model achieves a doubling of the number of contacts by using two L-shaped contacts stacked in opposite directions with the same length of conductive plate 1. This not only increases the current carrying capacity but also reduces the contact resistance. In addition, compared with the prior art, it can ensure the miniaturization of the switch.
[0034] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.
Claims
1. A contact device, characterized in that, Includes a conductive plate (1) and at least one set of contact assemblies (2) disposed on the conductive plate (1), the contact assembly (2) comprising: The first L-shaped contact (3) has a first horizontal plate portion (4) and a first vertical plate portion (5) that are bent and connected together; The second L-shaped contact (6) is arranged opposite to the first L-shaped contact (3), and has a second horizontal plate portion (7) and a second vertical plate portion (8) that are bent and connected. The second horizontal plate portion (7) is stacked and fixed above the first horizontal plate portion (4).
2. The contact device according to claim 1, characterized in that, The second horizontal plate portion (7) and the first horizontal plate portion (4) are fixed to the conductive plate (1) by the same fastener.
3. The contact device according to claim 1 or 2, characterized in that, Both the first vertical plate portion (5) and the second vertical plate portion (8) include two oppositely arranged contact plates (9) and elastic arms (10) bent and connected to the contact plates (9), with a slot formed between the two elastic arms (10).
4. The contact device according to claim 3, characterized in that, It also includes a retaining ring (11) for clamping the two elastic arms (10).
5. The contact device according to claim 4, characterized in that, The outer side of the elastic arm (10) is provided with a positioning groove (12) that abuts against the end of the retaining ring (11).
6. The contact device according to claim 3, characterized in that, One of the contact plates (9) has a limiting block (13) extending toward the opposite contact plate (9) at its lower center.
7. The contact device according to claim 1, characterized in that, The contact assembly (2) has two sets.
8. A switch, characterized in that, Includes the contact device as described in any one of claims 1-7.