Three-position disconnecting switch and environment-friendly gas cabinet

Abstract

The utility model provides a three-station disconnecting switch and an environment-friendly gas cabinet, which belong to the technical field of power switches, and comprise a support, a static contact, a grounding contact, a main shaft and a moving contact, the support comprises two side plates, a static contact support and a grounding contact support, the static contact support and the grounding contact support are fixed between the two side plates, and the grounding contact support is located below the static contact support; the static contact is fixed on the static contact bracket; the grounding contact is fixed on the grounding contact bracket; the two ends of the main shaft are rotationally connected to the two side plates, and the main shaft can be connected with a three-station operating mechanism and is driven by the three-station operating mechanism to rotate forwards and backwards; the moving contact is installed on the main shaft, contacts with the static contact when rotating forwards along with the main shaft, and contacts with the grounding contact when rotating backwards along with the main shaft. The three-position isolating switch provided by the utility model is compact in structure, small in size and convenient to assemble, can reduce the space occupation in a switch cabinet, is beneficial to the miniaturization of the switch cabinet, is also beneficial to the circulation heat dissipation of air and the arrangement of cables, and reduces the fault rate of the switch cabinet.

Description

Technical Field

[0001] The utility model belongs to the technical field of power switches, and in particular relates to a three-position isolating switch and an environmentally friendly gas cabinet equipped with the three-position isolating switch. Background Art

[0002] Currently, three-position disconnectors are key components in the primary electrical circuit of environmental gas cabinets, integrating the functions of both disconnectors and grounding switches. With the advancement of intelligent systems, environmental gas cabinets require the installation of more electrical components, cables, and copper busbars to achieve these functions. However, traditional three-position disconnectors are relatively large, occupying a significant amount of space within the cabinet, which increases the size of the cabinet and, consequently, the manufacturing cost. Furthermore, the increased cabinet space requires a larger floor area, making installation inconvenient and assembly complex, making on-site maintenance and repair difficult. Utility Model Content

[0003] The embodiment of the present invention provides a three-station isolated switch and environmental protection gas cabinet with a compact structure and easy installation. It can improve installation efficiency and reduce cabinet installation space, thereby facilitating cabinet size reduction, production cost and land area reduction.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a three-position isolating switch, including: a bracket, a static contact, a grounding contact, a main shaft and a moving contact, the bracket including two side plates, a static contact bracket and a grounding contact bracket fixed between the two side plates, the grounding contact bracket is located below the static contact bracket; the static contact is fixed on the static contact bracket; the grounding contact is fixed on the grounding contact bracket; the two ends of the main shaft are rotatably connected to the two side plates, the main shaft can be connected to the three-position operating mechanism, and rotate forward and reverse under the drive of the three-position operating mechanism; the moving contact is installed on the main shaft, contacts the static contact when the main shaft rotates forward, and contacts the grounding contact when the main shaft rotates reversely.

[0005] In combination with the first aspect, in one feasible manner, CuCr alloy contacts are provided on the moving contacts.

[0006] In combination with the first aspect, in one feasible manner, a bent support plate is provided at the lower edge of the grounding contact bracket, and the grounding contact is also fixed on the bent support plate.

[0007] In combination with the first aspect, in one feasible manner, a grounding contact mounting seat is provided on the grounding contact bracket, and the grounding contact is fixed to the grounding contact mounting seat by screws.

[0008] In combination with the first aspect, in one feasible manner, a static contact mounting seat is provided on the static contact support, and the static contact is fixed to the static contact mounting seat by bolts.

[0009] In combination with the first aspect, in one feasible manner, an insulating crooked arm is provided on the main shaft, one end of the moving contact is fixed in the insulating crooked arm, and the other end is exposed outside the insulating crooked arm.

[0010] In combination with the first aspect, in one practicable manner, heat dissipation fins are provided on the outer side surface of the insulating elbow.

[0011] In combination with the first aspect, in one achievable manner, the insulating crooked arm has a quadrangular pyramidal shape, and heat dissipation fins are respectively provided on the four sides thereof, and the heat dissipation fins are triangular in shape.

[0012] In a second aspect, an embodiment of the present invention further provides an environmentally friendly gas cabinet, comprising the three-position isolating switch.

[0013] Compared to existing technologies, the three-position disconnector and environmentally friendly gas cabinet provided by this utility model offer the following advantages: the moving contact, static contact, and grounding contact are all integrated and fixed to a bracket, and the switching of closing, opening, and grounding is accomplished through a three-position operating mechanism on the main shaft. This compact structure, small size, and easy assembly can reduce space occupied within the switch cabinet, facilitate the miniaturization of the switch cabinet, and also facilitate air circulation and heat dissipation between components within the switch cabinet and the arrangement of cables, thereby reducing the failure rate of the switch cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the main structure of a three-position disconnect switch provided by an embodiment of the utility model;

[0015] Figure 2 A side structural diagram of a three-position disconnect switch provided in an embodiment of the present utility model;

[0016] Figure 3 Schematic diagram of the three-position isolating switch provided in the embodiment of the utility model Figure 1 ;

[0017] Figure 4 Schematic diagram of the three-position isolating switch provided in the embodiment of the utility model Figure 2 ;

[0018] Figure 5 Schematic diagram of the three-position isolating switch provided in the embodiment of the utility model Figure 3 ;

[0019] Figure 6A schematic diagram of the three-dimensional structure of the grounding contact bracket provided in an embodiment of the present utility model;

[0020] Description of reference numerals:

[0021] 1. Grounding contact bracket; 2. Insulating elbow; 3. Heat dissipation fin; 4. Moving contact; 5. Side panel; 6. Static contact bracket; 7. Static contact; 8. Main shaft; 9. Static contact mounting base; 10. Grounding contact mounting base; 11. Bending support plate; 12. Grounding contact. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] Please also refer to Figures 1 to 6 The three-position disconnector provided by the present invention is now described. The three-position disconnector includes a bracket, a static contact 7, a grounding contact 12, a main shaft 8, and a movable contact 4. The bracket includes two side plates 5, a static contact bracket 6 fixed between the two side plates 5, and a grounding contact bracket 1, with the grounding contact bracket 1 located below the static contact bracket 6; the static contact 7 is fixed to the static contact bracket 6; the grounding contact 12 is fixed to the grounding contact bracket 1; the main shaft 8 is rotatably connected to the two side plates 5 at both ends, and the main shaft 8 can be connected to the three-position operating mechanism and rotate forward and reverse under the drive of the three-position operating mechanism; the movable contact 4 is mounted on the main shaft 8, and contacts the static contact 7 when the main shaft 8 rotates forward, and contacts the grounding contact 12 when the main shaft 8 rotates reversely.

[0024] Compared with existing technologies, the three-position disconnector provided by this utility model has the following advantages: the movable contact 4, the stationary contact 7, and the grounding contact 12 are all integrated and fixed on the bracket, and the switching of closing, opening, and grounding is completed by the three-position operating mechanism of the main shaft 8. This compact structure, small size, and easy assembly can reduce the space occupied in the switch cabinet, facilitate the miniaturization of the switch cabinet, and also facilitate the air circulation and heat dissipation between the components of the switch cabinet and the arrangement of cables, thereby reducing the failure rate of the switch cabinet.

[0025] In some embodiments, see Figure 6As shown, the moving contact 4 is provided with a CuCr alloy contact. When the disconnector is closed, the moving contact 4 and the static contact 7 make frictional contact. Because the contact point of the moving contact 4 is small, after multiple closing and opening operations, the silver plating of the contact is significantly worn. The contact surface has no coating protection, resulting in increased contact resistance, which will greatly affect product performance. This application uses a CuCr alloy material with better performance for the contact point of the moving contact 4. However, due to the high cost of CuCr alloy materials, this application only embeds the designed CuCr alloy contacts at the contact position of the moving contact 4, which can achieve better product performance at a lower cost.

[0026] The operation process of the three-position isolating switch provided by the utility model:

[0027] The isolating switch has three positions: closed, open, and earthed. The initial position of the isolating switch is open. When the isolating switch is closed, the operating mechanism rotates 60° counterclockwise, and the moving contact 4 contacts the static contact 7, and the isolating switch is closed; when the isolating switch is open, the operating mechanism rotates 60° clockwise, and the moving contact 4 does not contact, and the isolating switch is open; when the earthing switch is closed, the operating mechanism rotates another 60° clockwise, and the moving contact 4 contacts the earthing contact 12, and the isolating switch is earthed; when the earthing is open, the operating mechanism rotates 60° counterclockwise, and the isolating switch reaches the open position.

[0028] The service life of the isolation knife switch is generally required to be 5000 times. When the knife switch is operated, the contact part is worn due to friction. When it is operated a certain number of times, the silver plating layer on the surface of the contact will be lost. At this time, the contact will oxidize and the contact resistance will increase, causing the product to heat up and malfunction. By embedding CuCr alloy contacts in the contact part of the moving contact 4 and using a small amount of CuCr alloy material with excellent performance as the contact point, the product can achieve 5000 operations without performance degradation, thereby achieving reliable operation of the product.

[0029] In some embodiments, see Figure 6 As shown, a bent support plate 11 is provided at the lower edge of the grounding contact bracket 1, and the grounding contact 12 is fixed on the bent support plate 11. The bent support plate 11 supports the grounding contact 12.

[0030] In some embodiments, see Figure 6 As shown, a grounding contact mounting seat 10 is provided on the grounding contact bracket 1 , and the grounding contact 12 is fixed to the grounding contact mounting seat 10 by screws, so as to facilitate the installation of the grounding contact 12 .

[0031] In some embodiments, see Figure 4 As shown, a static contact mounting seat 9 is provided on the static contact bracket 6 , and the static contact 7 is fixed to the static contact mounting seat 9 by bolts to facilitate the installation of the static contact 7 .

[0032] In some embodiments, see Figures 1 to 5 As shown, an insulating crank arm 2 is provided on the main shaft 8, one end of the movable contact 4 is fixed in the insulating crank arm 2, and the other end is exposed outside the insulating crank arm 2. The insulating crank arm 2 has the function of insulating and protecting the movable contact 4 and assisting the movable contact 4 to rotate.

[0033] In some embodiments, see Figures 1 to 5 As shown, heat dissipation fins 3 are provided on the outer surface of the insulating elbow 2 to improve the heat dissipation effect of the disconnector.

[0034] In some embodiments, see Figures 1 to 5 As shown, the insulating arm 2 has a quadrangular pyramidal shape, and heat dissipation fins 3 are respectively provided on its four sides. The heat dissipation fins 3 are triangular in shape, which further improves the heat dissipation effect of the disconnector.

[0035] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0036] Based on the same inventive concept, an embodiment of the present application also provides an environmentally friendly gas cabinet, including the three-position isolating switch.

[0037] The environmentally friendly gas cabinet provided by the utility model has a compact structure, small size, and is easy to assemble. It can reduce the space occupied in the switch cabinet, which is conducive to the miniaturization of the switch cabinet. It is also conducive to the circulation and heat dissipation of air between the components in the switch cabinet and the arrangement of cables, thereby reducing the failure rate of the switch cabinet.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A three-position isolating switch, characterized in that: include: A bracket comprising two side plates (5), a stationary contact bracket (6) fixed between the two side plates (5), and a grounding contact bracket (1), wherein the grounding contact bracket (1) is located below the stationary contact bracket (6); A static contact (7) fixed on the static contact bracket (6); A grounding contact (12) fixed on the grounding contact bracket (1); A main shaft (8) is rotatably connected to the two side plates (5) at both ends. The main shaft (8) can be connected to a three-station operating mechanism and rotate forward and backward under the drive of the three-station operating mechanism. as well as The moving contact (4) is mounted on the main shaft (8) and contacts the static contact (7) when the main shaft (8) rotates forward, and contacts the grounding contact (12) when the main shaft (8) rotates backward.

2. The three-position disconnect switch according to claim 1, characterized in that: The moving contacts (4) are all provided with CuCr alloy contacts.

3. The three-position disconnect switch according to claim 1, characterized in that: A bent support plate (11) is provided on the lower edge of the grounding contact bracket (1), and the grounding contact (12) is also fixed on the bent support plate (11).

4. The three-position disconnect switch according to claim 1, characterized in that: A grounding contact mounting seat (10) is provided on the grounding contact bracket (1), and the grounding contact (12) is fixed to the grounding contact mounting seat (10) by means of screws.

5. The three-position disconnect switch according to claim 1, characterized in that: A static contact mounting seat (9) is provided on the static contact bracket (6), and the static contact (7) is fixed to the static contact mounting seat (9) by means of bolts.

6. The three-position disconnect switch according to claim 1, characterized in that: An insulating crooked arm (2) is provided on the main shaft (8); one end of the movable contact (4) is fixed inside the insulating crooked arm (2), and the other end is exposed outside the insulating crooked arm (2).

7. The three-position disconnect switch according to claim 6, characterized in that: Heat dissipation fins (3) are provided on the outer side surface of the insulating elbow (2).

8. The three-position disconnect switch according to claim 7, characterized in that: The insulating crooked arm (2) has a quadrangular pyramidal shape, and heat dissipation fins (3) are respectively provided on its four side surfaces, and the heat dissipation fins (3) are triangular in shape.

9. An environmentally friendly gas cabinet, characterized in that: It comprises the three-position isolating switch according to any one of claims 1 to 8.

Images