Contact system of a transfer switch

Abstract

The utility model relates to the technical field of conversion switches, and specifically to a contact system of a conversion switch. The utility model comprises a frame, wherein a driving shaft is rotatably connected inside the frame, a shaft sleeve is fixedly connected to a side wall of the driving shaft, a driving connecting rod is rotatably connected to the shaft sleeve, a moving contact is rotatably connected to the driving connecting rod, an external wiring board and a static contact are fixedly connected to the bottom of the frame, a copper braided wire is fixedly connected to the external wiring board, one end of the moving contact cooperates with the static contact, the other end of the moving contact is rotatably connected to the inside of the frame, the end of the copper braided wire is electrically connected to one end of the moving contact, and an arc extinguishing component is clamped at a position on one side of the static contact in the frame; the moving contact is driven to rotate by the driving shaft and the driving connecting rod, so that one end of the moving contact contacts the static contact, the external wiring board, the copper braided wire, the moving contact and the static contact are connected, and the conversion switch is closed, and the arc extinguishing component processes the arc generated by opening and closing the switch, and has high connection and disconnection capacity and short-time tolerance capacity.

Description

Technical Field

[0001] The utility model relates to the field of conversion switches, in particular to a contact system of a conversion switch. Background Art

[0002] With the improvement of human living standards and the widespread application of electricity and electrical equipment, many places have strict requirements on power supply continuity and do not allow long-term power outages. Most of them use automatic transfer switches to ensure continuous power supply. Automatic transfer switches automatically switch the load power supply circuit from the abnormal power supply to the normal second power supply (backup power supply), which is of great significance to the continuity and reliability of power supply.

[0003] Existing automatic transfer switch electrical appliances often use motors or electromagnets to drive the execution contact system. The commonly used contact systems on transfer switch electrical appliances are mainly divided into two types: one is similar to the snap-on contact in the low-voltage circuit breaker and the knife-type inserted clamping contact in the low-voltage disconnector.

[0004] The existing snap-on contacts are welded with silver-based alloy materials, which are resistant to arc burning when closing or disconnecting the circuit and have high connection and disconnection capabilities. However, the electric repulsion of this type of contact makes the dynamic and thermal stability poor, so it is difficult to achieve or meet the short-time withstand current and time period required by the standard; the other type of contact blade insertion clamping contact has an electric force of clamping force, high dynamic and thermal stability, and thus has a high short-time withstand index, but the contact blades are mostly made of copper-based materials, which are not resistant to arc burning when connecting and disconnecting currents, and it is difficult to have high connection and disconnection capabilities.

[0005] Therefore, a contact system of a transfer switch is proposed. Utility Model Content

[0006] The purpose of the utility model is to provide a contact system of a transfer switch to solve the problems raised in the above background technology.

[0007] The purpose of the utility model can be achieved through the following technical solutions:

[0008] A contact system of a switching switch comprises a frame, wherein a driving shaft is rotatably connected inside the frame, a shaft sleeve is fixedly connected to the side wall of the driving shaft, a driving connecting rod is rotatably connected to the shaft sleeve, a moving contact is rotatably connected to the driving connecting rod, an external wiring board and a static contact are fixedly connected to the bottom of the frame, a copper braided wire is fixedly connected to the external wiring board, one end of the moving contact cooperates with the static contact, the other end of the moving contact is rotatably connected to the inside of the frame, an end of the copper braided wire is electrically connected to one end of the moving contact, and an arc extinguishing assembly is clamped at a position on one side of the static contact in the frame.

[0009] Preferably, an arc-striking piece is fixedly connected to the upper end of the static contact, a mounting cavity is fixedly connected in the frame, the arc-extinguishing assembly is clamped in the mounting cavity, the arc-extinguishing assembly is located above the static contact, and the arc-extinguishing assembly is located on the side of the moving contact away from the external terminal board.

[0010] Preferably, the arc extinguishing assembly includes insulating plates, which are symmetrically arranged in two groups, multiple groups of arc extinguishing grids are clamped inside the two groups of insulating plates, the multiple groups of arc extinguishing grids are arranged in a linear array, and the two groups of insulating plates are respectively clamped on both sides of the installation cavity.

[0011] Preferably, the side wall of the frame is fixedly connected with an installation frame, the installation frame is located on one side of the arc extinguishing assembly, an arc isolation plate and an isolating metal mesh are clamped in the installation frame, a plurality of groups of holes are penetrated through the arc isolation plate, and the isolating metal mesh is located on the side of the arc isolation plate away from the arc extinguishing assembly.

[0012] Preferably, the driving connecting rod is rotatably connected to the middle part of the moving contact, a bracket is rotatably connected to the upper end of the moving contact, the bracket is rotatably connected to the driving connecting rod, and a spring is fixed between the inner wall of the bracket and the upper end of the moving contact.

[0013] Preferably, the bottom of the frame is provided with a mounting groove 1 and a mounting groove 2, the external wiring board and the static contact are respectively fixed in the mounting groove 1 and the mounting groove 2, the side wall of the external wiring board is fixed with a mounting plate, and the mounting plate is fixed in the frame by bolts.

[0014] Beneficial effects of the utility model:

[0015] The utility model drives the moving contact to rotate through a driving shaft and a driving connecting rod, so that one end of the moving contact contacts the static contact, so that the external wiring board, the copper braided wire, the moving contact and the static contact are connected, so that the conversion switch is closed, and the arc extinguishing component processes the arc generated by opening and closing the switch, and has high connection and breaking capacity and short-time tolerance capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the overall explosion structure of the utility model;

[0019] Figure 3 It is a schematic diagram of the framework structure of the utility model;

[0020] Figure 4It is a schematic diagram of the internal structure of the framework of the utility model;

[0021] Figure 5 It is a three-dimensional schematic diagram of the internal structure of the frame of the utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the moving contact of the utility model;

[0023] Figure 7 This is a schematic diagram of the structure of the conversion switch of the utility model;

[0024] The reference numerals in the figures are as follows:

[0025] 1. Frame; 3. Mounting frame; 4. Arc isolation plate; 5. Isolation metal mesh; 6. External terminal block; 7. Mounting plate; 8. Copper braided wire; 9. Static contact; 10. Arc striking plate; 14. Mounting slot 1; 15. Mounting slot 2; 16. Drive shaft; 17. Bushing; 18. Drive connecting rod; 20. Moving contact; 21. Bracket; 22. Spring; 23. Mounting cavity; 24. Arc extinguishing grid; 25. Insulation plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] A contact system of a transfer switch, such as Figure 1-Figure 7 As shown, it includes a frame 1, in which a driving shaft 16 is rotatably connected inside the frame 1, a shaft sleeve 17 is fixed to the side wall of the driving shaft 16, a driving connecting rod 18 is rotatably connected to the shaft sleeve 17, a moving contact 20 is rotatably connected to the driving connecting rod 18, an external wiring board 6 and a static contact 9 are fixed to the bottom of the frame 1, a copper braided wire 8 is fixed to the external wiring board 6, one end of the moving contact 20 cooperates with the static contact 9, and the other end of the moving contact 20 is rotatably connected to the inside of the frame 1, an end of the copper braided wire 8 is electrically connected to one end of the moving contact 20, and an arc extinguishing assembly is clamped at a position on one side of the static contact 9 in the frame 1.

[0028] The utility model drives the moving contact 20 to rotate through the driving shaft 16 and the driving connecting rod 18, so that one end of the moving contact 20 contacts with the static contact 9, so that the external wiring board 6, the copper braided wire 8, the moving contact 20, and the static contact 9 are connected, including two incoming lines, and the arc extinguishing component processes the arc generated by opening and closing the switch. The moving contact 20 adopts the copper braided wire 8 to form a soft connection state with the external wiring board 6, and is arranged back to back on both sides to provide two dedicated arc extinguishing spaces, which fundamentally avoids the short circuit of the two-way arc. The single-pole module executes the switch, and also solves the risk of phase-to-phase arc short circuit that causes the conversion switch to close. The moving contact 20 is designed to have a rotation angle of more than 40° for opening and closing, providing a larger opening distance, which is conducive to lengthening the disconnecting arc. The static contact 9 is set to a 7-shape to enhance the breaking power potential energy. Therefore, the contact system has a high connection and breaking capacity and short-time tolerance capacity.

[0029] An arc-striking piece 10 is fixedly connected to the upper end of the static contact 9 , a mounting cavity 23 is fixedly connected to the frame 1 , an arc-extinguishing assembly is clamped in the mounting cavity 23 , the arc-extinguishing assembly is located above the static contact 9 , and the arc-extinguishing assembly is located on the side of the moving contact 20 away from the external terminal board 6 .

[0030] like Figure 2-Figure 5 As shown, the arc-starting piece 10 guides the arc generated by opening and closing the switch into the arc-extinguishing assembly to prevent the arc from damaging the internal structure of the switch.

[0031] The arc extinguishing assembly includes an insulating plate 25 , which is symmetrically arranged in two groups. Multiple groups of arc extinguishing grids 24 are clamped inside the two groups of insulating plates 25 . The multiple groups of arc extinguishing grids 24 are arranged in a linear array. The two groups of insulating plates 25 are clamped on both sides of the installation cavity 23 respectively.

[0032] like Figure 2-Figure 5 As shown, when the moving contact 20 and the stationary contact 9 are disconnected and combined, an arc is generated. At the moment of arc elongation, the arc-starting piece 10 draws the arc into the arranged arc-extinguishing grid 24 to divide and extinguish it. The arc-extinguishing grid 24 is distributed in a vertical array, and insulating plates 25 are riveted on both sides to prevent the arc-extinguishing grid 24 from falling over after burning, hindering the moving contact 20 from closing and opening, and causing a short circuit.

[0033] The side wall of the frame 1 is fixedly connected with a mounting frame 3, which is located at one side of the arc extinguishing component. An arc isolation plate 4 and an isolating metal mesh 5 are clamped in the mounting frame 3. Multiple groups of holes are penetrated through the arc isolation plate 4, and the isolating metal mesh 5 is located at the side of the arc isolation plate 4 away from the arc extinguishing component.

[0034] like Figure 2-Figure 5 As shown, an arc-isolating plate 4 is provided at the rear end of the arc-extinguishing assembly, and a plurality of holes are punched to absorb arc ions again. Finally, staggered narrow slits are provided in the mounting frame 3, and an isolating metal mesh 5 is installed to allow high-temperature and high-pressure gas to be ejected while reducing arcing to the outside.

[0035] The driving connecting rod 18 is rotatably connected to the middle of the moving contact 20 , the upper end of the moving contact 20 is rotatably connected to a bracket 21 , the bracket 21 is rotatably connected to the driving connecting rod 18 , and a spring 22 is fixed between the inner wall of the bracket 21 and the upper end of the moving contact 20 .

[0036] like Figure 4-Figure 6 As shown, the driving link 18 is rotatably connected to the middle part of the moving contact 20, and the spring 22 is arranged on the inner wall of the bracket 21 and connected to the middle of the upper end of the moving contact 20, reducing the force arm of the spring 22 on the moving contact, and connected to the driving link 18. The bracket 21 and the spring 22 are used to make the moving contact 20 have a certain initial pressure. The driving link 18 makes the bracket 21 compress the spring 22, and the spring 22 squeezes one end of the moving contact 20. When the short-circuit current passes through the contact point between the moving contact 20 and the static contact 9, the spring 22 and the driving link 18 act on the moving contact 20 at the same time to prevent the contacts from being repelled and ensure dynamic stability.

[0037] The frame 1 has a mounting groove 14 and a mounting groove 2 15 at the bottom, the external wiring board 6 and the static contact 9 are fixedly connected to the mounting groove 14 and the mounting groove 2 15 respectively, and the side wall of the external wiring board 6 is fixedly connected to the mounting plate 7, which is fixedly connected to the frame 1 by bolts.

[0038] like Figure 1-Figure 5 As shown, the first mounting groove 14 and the second mounting groove 15 facilitate the installation of the external wiring board 6 and the static contact 9.

[0039] The working principle of the contact system of a transfer switch provided by the utility model is as follows:

[0040] The moving contact 20 is driven to rotate by the driving shaft 16 and the driving connecting rod 18, so that one end of the moving contact 20 contacts with the static contact 9, so that the external wiring board 6, the copper braided wire 8, the moving contact 20, and the static contact 9 are connected. It includes two incoming lines. The arc extinguishing component processes the arc generated by opening and closing the switch. The moving contact 20 uses the copper braided wire 8 to form a soft connection with the external wiring board 6, and is arranged back to back on both sides to provide two dedicated arc extinguishing spaces, which fundamentally avoids the short circuit of the two-way arc. The single-pole module executes the switch, and also solves the risk of phase-to-phase arc short circuit that causes the conversion switch to close. The moving contact 20 is designed to have a rotation angle of more than 40° for opening and closing, providing a larger opening distance, which is conducive to lengthening the disconnecting arc. The static contact 9 is set to a 7-shape to enhance the breaking power potential energy. Therefore, the contact system has a high connection and breaking capacity and short-time tolerance capacity.

[0041] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A contact system for a transfer switch, comprising a frame (1), characterized in that: The frame (1) is internally rotatably connected to a drive shaft (16), a shaft sleeve (17) is fixedly connected to the side wall of the drive shaft (16), a drive connecting rod (18) is rotatably connected to the shaft sleeve (17), a moving contact (20) is rotatably connected to the drive connecting rod (18), an external wiring board (6) and a stationary contact (9) are fixedly connected to the bottom of the frame (1), a copper braided wire (8) is fixedly connected to the external wiring board (6), one end of the moving contact (20) cooperates with the stationary contact (9), the other end of the moving contact (20) is rotatably connected to the inside of the frame (1), the end of the copper braided wire (8) is electrically connected to one end of the moving contact (20), and an arc extinguishing component is clamped at a position on one side of the stationary contact (9) in the frame (1).

2. A contact system for a transfer switch according to claim 1, characterized in that: An arc-striking piece (10) is fixedly connected to the upper end of the stationary contact (9), a mounting cavity (23) is fixedly connected in the frame (1), an arc-extinguishing assembly is clamped in the mounting cavity (23), the arc-extinguishing assembly is located above the stationary contact (9), and the arc-extinguishing assembly is located on a side of the moving contact (20) away from the external wiring board (6).

3. A contact system for a transfer switch according to claim 2, characterized in that: The arc extinguishing assembly comprises an insulating plate (25), wherein two groups of insulating plates (25) are symmetrically arranged, and multiple groups of arc extinguishing grids (24) are clamped inside the two groups of insulating plates (25), and the multiple groups of arc extinguishing grids (24) are arranged in a linear array, and the two groups of insulating plates (25) are respectively clamped on both sides of the installation cavity (23).

4. A contact system for a transfer switch according to claim 3, characterized in that: The side wall of the frame (1) is fixedly connected with a mounting frame (3), the mounting frame (3) is located at one side of the arc extinguishing component, an arc isolation plate (4) and an isolating metal mesh (5) are clamped in the mounting frame (3), a plurality of groups of holes are penetrated through the arc isolation plate (4), and the isolating metal mesh (5) is located at a side of the arc isolation plate (4) away from the arc extinguishing component.

5. The contact system of a transfer switch according to claim 1, characterized in that: The driving connecting rod (18) is rotatably connected to the middle part of the moving contact (20), the upper end of the moving contact (20) is rotatably connected to a bracket (21), the bracket (21) is rotatably connected to the driving connecting rod (18), and a spring (22) is fixed between the inner wall of the bracket (21) and the upper end of the moving contact (20).

6. A contact system for a transfer switch according to claim 1, characterized in that: The frame (1) is provided with a first mounting groove (14) and a second mounting groove (15) at the bottom, the external wiring board (6) and the static contact (9) are respectively fixedly connected to the first mounting groove (14) and the second mounting groove (15), the side wall of the external wiring board (6) is fixedly connected to a mounting plate (7), and the mounting plate (7) is fixedly connected to the frame (1) via bolts.

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