Contact structure of disconnecting switch

Abstract

The utility model provides a contact structure of an isolating switch, comprising a contact knife which can be installed on a switch body in an up-and-down linear movement manner; the static contact is provided with a U-shaped slot for the contact knife to insert, a straight conductive spring is mounted on the inner wall of the U-shaped slot, the length extension direction of the straight conductive spring is parallel to the contact knife surface of the side surface of the contact knife, and when the contact knife is inserted into the slot, the side surface of the straight conductive spring is extruded by the contact knife surface and is in fit contact with the contact knife surface. The straight conductive spring not only is used for providing contact pressure, but also is used for conductive connection between the static contact and the moving contact, when the current is increased, the contact area between the static contact and the contact knife can be increased only by slightly increasing the length of the straight conductive spring, and the increased contact pressure is small, so that the opening and closing contact process is more labor-saving, and the service life of the switch is prolonged. The pressure balance and stability of each phase contact can be ensured by adopting the straight conductive spring, and the adjustment by external force is not needed.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to a contact structure of an isolating switch. Background Art

[0002] Three-position disconnectors are often used in fully enclosed combination electrical appliances or ring network cabinets. The so-called three positions refer to three working positions: the closing position where the main break of the disconnector is connected, the isolating position where the main break is separated, and the grounding position on the grounding side.

[0003] Chinese patent document CN108511212A discloses a high voltage switch contact blade assembly and a high voltage switch, such as Figure 4 As shown, it comprises a stationary contact 01 and a blade contact assembly. The blade contact assembly comprises two opposing blades 02, with a space formed between the blades 02 for insertion of the stationary contact 01. A support rod 03 extends through the blades 02. Springs 04 are mounted on either end of the support rod 03, providing a force to pull the blades 02 closer together. As the current increases, the springs 04 must provide a greater contact pressure, requiring them to be longer. Furthermore, the three-phase contacts A, B, and C must maintain a suitable interphase distance to ensure electrical insulation. This results in a larger switch overall and increases production costs. Utility Model Content

[0004] To this end, the present invention provides a contact structure of an isolating switch, comprising a contact blade and a static contact, wherein the contact blade is mounted on a switch body so as to be movable linearly up and down; the static contact has a U-shaped slot for inserting the contact blade, and a straight conductive spring is mounted on the inner wall of the U-shaped slot, wherein the length extension direction of the straight conductive spring is arranged parallel to the contact blade surface on the side surface of the contact blade, wherein when the contact blade is inserted into the slot, the side surface of the straight conductive spring is squeezed by the contact blade surface and in close contact with it.

[0005] The cross-section of the straight conductive spring is elliptical, and an installation groove for installing the straight conductive spring is provided on the inner wall of the slot. The installation groove has a first contact surface arranged parallel to the moving direction of the stylus, and a second contact surface and a third contact surface arranged on the upper and lower sides of the first contact surface and inclined to the first contact surface. When one side surface of the elliptical straight conductive spring is squeezed by the stylus, the other side surface thereof is in contact with the first contact surface, the second contact surface and the third contact surface respectively.

[0006] The static contact has the straight conductive springs located on both sides of the slot, and each group includes a plurality of the straight conductive springs spaced apart and distributed along the moving direction of the contact blade.

[0007] The static contact includes a first contact plate and two second contact plates respectively arranged on both sides of the first contact plate. The two second contact plates and the first contact plate are combined to form the U-shaped slot.

[0008] The mounting groove is provided on the inner wall of the second contact plate, and the mounting groove extends along the length direction of the second contact plate.

[0009] The second contact plate is fixed to the first contact plate by bolts.

[0010] The technical solution of this utility model has the following advantages:

[0011] 1. The contact structure of the disconnector provided by the present invention comprises a stationary contact having a slot for inserting a contact blade. At least one straight conductive spring is mounted on the inner wall of the slot. The straight conductive spring extends parallel to the contact surface on the side of the contact blade. When the contact blade is inserted into the slot, the side surface of the straight conductive spring is pressed against and in contact with the contact surface. In addition to providing contact pressure, the straight conductive spring is also used for conductive connection between the static contact and the moving contact. When the current increases, the contact area between the static contact and the contact blade can be increased by only increasing the length of the straight conductive spring a little, and the increased contact pressure is small, making the opening and closing contact process more labor-saving. The use of the straight conductive spring can ensure that the contact pressure of each phase is balanced and stable, and no external force is required for adjustment. In addition, compared with the prior art method in which the spring and the contact blade are arranged vertically, the straight conductive spring in this application is arranged in parallel with the contact blade surface on the side of the contact blade. Therefore, the increase in the length of the straight conductive spring does not increase the width of each phase static contact. While ensuring the electrical gap between the two adjacent phase static contacts, the switch body is smaller in size than the prior art, which reduces the cost.

[0012] 2. The contact structure of the isolating switch provided by the present invention has an elliptical cross-section of the straight conductive spring, and an installation groove for installing the straight conductive spring is provided on the inner wall of the slot, the installation groove having a first contact surface arranged parallel to the moving direction of the contact blade, and a second contact surface and a third contact surface arranged on the upper and lower sides of the first contact surface and inclined to the first contact surface. When one side surface of the elliptical straight conductive spring is squeezed by the contact blade, the other side surface thereof is in contact with the first contact surface, the second contact surface, and the third contact surface, respectively. In this way, the number of contact points between the straight conductive spring and the contact blade is increased by at least twice, thereby reducing contact resistance, increasing conductivity, and reducing temperature rise. The three-point contact makes the positioning of the straight conductive spring more accurate, thereby ensuring connection reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 A perspective view of the isolating switch of the present utility model;

[0015] Figure 2 It is a three-dimensional diagram of the contact blade, the static contact and the straight conductive spring;

[0016] Figure 3 Schematic diagram of the explosion structure of the static contact and the straight conductive spring;

[0017] Figure 4 It is a structural diagram of the static contact and contact blade assembly in the prior art.

[0018] Description of reference numerals: 01, static contact; 02, blade; 03, support rod; 04, spring;

[0019] 1. Contact blade; 2. Switch body; 8. Slot; 9. Straight conductive spring; 10. Mounting slot; 11. First contact surface; 12. Second contact surface; 13. Third contact surface; 30. Stationary contact; 31. First contact plate; 32. Second contact plate; 110. Contact blade surface. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0021] 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 positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on 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.

[0022] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0023] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] Example

[0025] This embodiment provides a contact structure of an isolating switch, such as Figure 1 As shown, it includes a contact blade 1 and a fixed contact 30.

[0026] Static contact 30, such as Figure 2 and Figure 3 As shown, it has a U-shaped slot 8 for inserting the stylus 1. A straight conductive spring 9 is mounted on the inner wall of the U-shaped slot 8. The length of the straight conductive spring 9 is parallel to the stylus surface 110 on the side of the stylus 1. When the stylus 1 is inserted into the slot 8, the side of the straight conductive spring 9 is pressed by the stylus surface 110 and in contact with it. In this embodiment, the static contact 30 includes a first contact plate 31 and two second contact plates 32 disposed on either side of the first contact plate 31. The two second contact plates 32 and the first contact plate 31 enclose the U-shaped slot 8. The inner wall of the second contact plate 32 is provided with the mounting groove 10. The mounting groove 10 extends along the length of the second contact plate 32. The second contact plate 32 is fixed to the first contact plate 31 by bolts.

[0027] The cross section of the straight conductive spring 9 is elliptical, and the inner wall of the slot 8 is provided with a mounting groove 10 for mounting the straight conductive spring 9. Figure 2 The mounting slot 10 shown has a first contact surface 11 arranged parallel to the direction of movement of the stylus 1, and a second contact surface 12 and a third contact surface 13, disposed above and below the first contact surface 11 and arranged obliquely thereto. When one side of the elliptical straight conductive spring 9 is pressed by the stylus 1, the other side of the elliptical straight conductive spring 9 respectively contacts the first contact surface 11, the second contact surface 12, and the third contact surface 13. In this embodiment, the stationary contact 30 has straight conductive springs 9 located on both sides of the slot 8, with each group comprising a plurality of straight conductive springs 9 spaced apart along the direction of movement of the stylus 1.

[0028] The touch blade 1 is mounted on the switch body 2 so as to be movable up and down in a straight line. It should be noted that when the main shaft rotates, the touch blade 1 is driven to move up and down by the gear rack assembly. The gear rack assembly is a mature technology, so its specific structure and working principle will not be described in detail.

[0029] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A contact structure of an isolating switch, characterized in that: include: The contact blade (1) is mounted on the switch body (2) so as to be movable in a straight line up and down; The static contact (30) has a U-shaped slot (8) for inserting the contact blade (1), and a straight conductive spring (9) is installed on the inner wall of the U-shaped slot (8). The length extension direction of the straight conductive spring (9) is arranged parallel to the contact blade surface (110) on the side of the contact blade (1), wherein when the contact blade (1) is inserted into the slot (8), the side of the straight conductive spring (9) is squeezed by the contact blade surface (110) and is in contact with it.

2. The contact structure of the disconnector according to claim 1, characterized in that: The cross section of the straight conductive spring (9) is elliptical, and an installation groove (10) for installing the straight conductive spring (9) is provided on the inner wall of the slot (8), and the installation groove (10) has a first contact surface (11) arranged parallel to the moving direction of the touch knife (1), and a second contact surface (12) and a third contact surface (13) arranged on the upper and lower sides of the first contact surface (11) and inclined thereto, wherein when one side surface of the elliptical straight conductive spring (9) is squeezed by the touch knife (1), the other side surface thereof is in contact with the first contact surface (11), the second contact surface (12) and the third contact surface (13) respectively.

3. The contact structure of the disconnector according to claim 2, characterized in that: The static contact (30) has the straight conductive springs (9) located on both sides of the slot (8), and each group includes a plurality of the straight conductive springs (9) spaced apart and distributed along the moving direction of the contact blade (1).

4. The contact structure of the disconnector according to claim 2 or 3, characterized in that: The static contact (30) comprises a first contact plate (31) and two second contact plates (32) arranged on both sides of the first contact plate (31); the two second contact plates (32) and the first contact plate (31) are combined to form the U-shaped slot (8).

5. The contact structure of the disconnector according to claim 4, characterized in that: The mounting groove (10) is provided on the inner wall of the second contact plate (32), and the mounting groove (10) extends along the length direction of the second contact plate (32).

6. The contact structure of the disconnector according to claim 4, characterized in that: The second contact plate (32) is fixed to the first contact plate (31) by means of bolts.

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