Moving contact structure

Abstract

The utility model discloses a moving contact structure which comprises a contact assembly, an arc baffle, a contact support, a contact spring, a contact support, a contact support rotating shaft, a blocking plug, a side plate, a contact rotating shaft, a contact connecting rod shaft and a contact connecting rod spring. The contact blades are regularly installed on the busbar through braided wires, gaps are reserved between the contact blades, more than one movable contact is installed on the upper portion of each contact blade in the same direction as the busbar, gaps are reserved between the movable contacts, arc blocking plate ribs are regularly arranged on the bottom face of the arc blocking plate in the direction facing the contact assembly, and the arc blocking plate ribs are arranged on the bottom face of the arc blocking plate. According to the scheme, the problem that the short-time withstand current is difficult to improve in the prior art is solved, and the current on the movable contact on each contact piece is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of components of direct current electrical equipment, in particular to a moving contact structure of a direct current load switch. Background Art

[0002] At present, the DC energy storage industry generally requires high short-time withstand current. For example, in a DC load switch with a frame of 1600A, a short-time withstand current requirement of 120kA / 0.1s is proposed. Although the time is very short, the electric repulsion force generated by such a large current on the moving contact is very large, and the contact will be repelled in a few tens of milliseconds. The existing moving contact pieces for each phase use 8 contact pieces and moving contacts. According to theoretical calculations, the single-piece contact spring force required by 8 contact pieces is as high as about 250N. Due to the limited space of the moving contact, the moving contact spring force cannot be increased indefinitely. In addition, how to reduce the current flowing through the moving contact has become a new solution. Due to the limitation of the moving contact space, the number of contact pieces cannot be increased indefinitely. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides a moving contact structure and a DC load switch using the structure, so as to solve the problem that it is difficult to improve the short-time withstand current in the prior art.

[0004] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] A moving contact structure, including a contact assembly, an arc baffle, a contact support, a contact spring, a contact support, a contact support shaft, a stopper, a side plate, a contact shaft, a contact connecting rod shaft and a contact connecting rod spring, the contact assembly including a busbar, a plurality of sheet-like braided wires and the same number of contact sheets as the braided wires, the contact sheets are regularly installed on the busbar through the braided wires and a gap is left between each contact sheet, a spring groove is provided on the back of all the contact sheets, a shaft hole is opened at the same position in the middle of all the contact sheets, the contact shaft passes through the shaft hole, a connecting rod hole is opened on the side of the contact support, the contact connecting rod shaft, the contact connecting rod spring and the stopper are installed in the connecting rod hole in sequence, the side plate is fixed to the side of the contact support by a second screw at the top and the stopper is pressed into the connecting rod hole, the contact support faces the contact A plurality of spring grooves are regularly arranged in the direction of the head assembly, a plurality of contact springs are installed in the spring grooves, the other end of the contact spring is against the spring groove of the contact piece, the arc baffle plate and the contact bracket are both N-shaped, the arc baffle plate is sleeved on the contact assembly from the front and the first screws are used to fix the two sides to the upper part of the side plate, the bottom of the side plate and the two sides of the contact bracket are provided with bracket shaft holes, the contact bracket is sleeved on the outside of the bottom of the side plate from the back and the two are connected together by the contact bracket shaft, the upper part of each contact piece is provided with a number greater than one moving contact in the same direction as the busbar, the lower part is a whole, a gap is left between the moving contacts, the bottom surface of the arc baffle plate facing the direction of the contact assembly is regularly provided with arc baffle ribs, the arc baffle ribs extend into the gap between the contact pieces, and the thickness of the arc baffle ribs is less than the gap width.

[0006] Preferably, the moving contact is welded to the upper part of the contact piece.

[0007] Preferably, the position where the moving contacts are installed on the upper part of the contact piece is processed into the same number of support pieces perpendicular to the thickness direction with gaps according to the number of moving contacts, and the lower ends of the separated support pieces are located lower than the lowest ends of the moving contacts.

[0008] Preferably, the upper portion of the contact piece is integral.

[0009] Preferably, a notch is provided on one side of the bottom end of the contact piece, and a protrusion matching the notch of the bottom end of the contact piece is provided on the same side of the top end of the braided wire, and the protrusion at the top end of the braided wire is welded in the notch of the bottom end of the contact piece.

[0010] Preferably, the notch and the protrusion are both square.

[0011] Preferably, a protruding feature extends from the bottom end of the braided wire, and regularly arranged sheet-shaped grooves are provided above the rear of the busbar, and all the braided wires are welded in the grooves of the busbar through the protruding features at the bottom end.

[0012] Preferably, the protruding feature at the bottom end of the braided wire and the groove on the busbar are square.

[0013] Preferably, the same arc baffle plate ribs are also provided between adjacent arc baffle plate ribs on the arc baffle plate, the arc baffle plate ribs extend into between adjacent support plates, and the thickness of the arc baffle plate ribs is smaller than the gap between the two support plates.

[0014] Preferably, the width of the moving contact is equal to the thickness of the support sheet.

[0015] A moving contact structure proposed in the present application, by arranging a plurality of moving contacts on the moving contact piece of the DC load switch to be used for shunting and reducing the repulsive force of the contacts, and arc baffle ribs are arranged on the arc baffle plate and extend between the contact pieces to prevent the contact pieces from being deformed due to the attraction force between the contact pieces, thereby solving the problem of difficulty in increasing the short-time withstand current, reducing the current on the moving contact on each contact piece, and effectively improving the short-time withstand current of the DC load switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of an embodiment of a contact sheet of the present application;

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of another embodiment of the contact sheet of the present application;

[0018] Figure 3 This is a schematic diagram of a three-dimensional structure of an assembled contact assembly according to an embodiment of the present application;

[0019] Figure 4 This is a schematic diagram of an exploded three-dimensional structure of an embodiment of a contact assembly of the present application;

[0020] Figure 5 This is a schematic diagram of the exploded three-dimensional structure of an embodiment of a moving contact assembly of the present application;

[0021] Figure 6 This is a schematic diagram of the three-dimensional structure of an assembled movable contact assembly according to an embodiment of the present application;

[0022] Figure 7 This is a schematic diagram of the three-dimensional structure of an embodiment of an arc baffle of the present application;

[0023] Among them, 1-contact assembly, 101-contact sheet, 1011-moving contact, 102-braided wire, 103-busbar, 2-arc baffle plate, 21-arc baffle plate rib, 3-contact support, 4-contact spring, 5-contact bracket, 6-contact bracket shaft, 7-stopper, 8a-left plate, 8b-right plate, 9a-first screw, 9b-second screw, 10-contact shaft, 11-contact connecting rod shaft, 12-contact connecting rod spring. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0025] The present embodiment provides a technical solution: the movable contact structure of the present utility model includes a contact assembly 1, an arc baffle 2, a contact support 3, a plurality of contact springs 4, a contact bracket 5, a contact bracket shaft 6, two stoppers 7, two side plates, a contact shaft 10, two contact connecting rod shafts 11 and two contact connecting rod springs 12, each of the contact assemblies 1 includes a busbar 103, eight sheet-like braided wires 102 and eight contact sheets 101, the contact sheets 101 are regularly installed on the busbar 103 through the braided wires 102 and leave gaps between each contact sheet 101, and the following structure is used in the present embodiment: the contact sheets 101 A notch is provided on one side of the bottom end, and a protrusion that matches the notch at the bottom end of the contact sheet 101 is provided on the same side of the top end of the braided wire 102. The protrusion at the top end of the braided wire 102 is welded in the notch at the bottom end of the contact sheet 101. In this embodiment, the notch and the protrusion are both square, and other shapes can certainly be used; the bottom end of the braided wire 102 has a protruding feature, and the upper rear portion of the busbar 103 is provided with regularly arranged sheet-shaped grooves. All the braided wires 102 are welded in the grooves of the busbar 103 through the protruding features at the bottom end. In this embodiment, the protruding features at the bottom end of the braided wire 102 and the grooves on the busbar 103 are square, and other shapes can certainly be used. In addition to the above-mentioned notch matching and fixing method, other installation forms can also be used, such as plug-in, etc.

[0026] A spring groove is provided on the back of all the contact pieces 101, and a shaft hole is opened at the same position in the middle of all the contact pieces 101, and the contact shaft 10 passes through the shaft hole. A connecting rod hole is opened on the side of the contact support 3, and each set of the contact connecting rod shaft 11, the contact connecting rod spring 12, and the plug 7 are installed in the connecting rod hole from both sides in sequence. The side plate includes a left side plate 8a and a right side plate 8b, and the side plate is fixed to the side of the contact support 3 by the second screw 9b on the upper part and presses the plug 7 into the connecting rod hole. The contact support 3 is regularly provided with a plurality of spring grooves facing the contact assembly 1. In this embodiment, two rows of spring grooves are provided, with eight in each row. A total of sixteen contact springs 4 are installed in the spring grooves, and the other ends of every two contact springs 4 are against the spring grooves of the same contact piece 101.

[0027] The arc baffle plate 2 and the contact bracket 5 are both N-shaped. The arc baffle plate 2 is put on the contact assembly 1 from the front and is also fixed to the upper part of the side plate using the first screws 9a on both sides. Bracket shaft holes are opened on the bottom of the side plate and both sides of the contact bracket 5. The contact bracket 5 is put on the outside of the bottom of the side plate from the back and the two are connected together using the contact bracket shaft 6.

[0028] Two moving contacts 1011 are installed on the upper part of each contact piece 101 in the same direction as the busbar 103, and the lower part is a whole. Gaps are left between the moving contacts 1011, and arc baffle ribs 21 are regularly arranged on the bottom surface of the arc baffle 2 facing the direction of the contact assembly 1. The arc baffle ribs 2 extend into the gaps between the contact pieces 101, and the thickness of the arc baffle ribs is less than the gap width.

[0029] There are many ways to install the two moving contacts 1011. In this embodiment, the moving contact 1011 is welded on the upper part of the contact sheet 101. Other forms such as plug-in can also be used, but the manufacturing process and difficulty will increase. The contact sheet 101 behind the moving contact 1011 can also have many forms. Figure 2 The upper part of the contact piece 101 is integral, and Figure 1 As another embodiment, there is a better effect, in which two support pieces perpendicular to the thickness direction and with a gap are processed at the position where the moving contact 1011 is installed on the upper part of the contact piece 101, and the lower end position of the separated support pieces is lower than the lowest end of the moving contact 1011, and the thickness of the support piece is equal to the width of the moving contact 1011. At the same time, the same arc baffle plate ribs 21 are also provided between adjacent arc baffle plate ribs 21 on the arc baffle plate 2, and the arc baffle plate ribs 21 extend into the space between the adjacent support pieces. The thickness of the arc baffle ribs 21 is less than the gap between the two support sheets, so that in this embodiment, a total of fifteen arc baffle ribs 21 are provided, namely, seven between the original contact sheets 101 and eight between the support sheets. These arc baffle ribs 21 are used to separate the upper half of the contact sheet 101, namely, the contact sheet is divided into two parts, and between each contact sheet 101, because when a large current flows through each contact sheet 101 in the same direction, a mutual attraction force will be generated to prevent the support sheets of the contact sheet 101 from deforming. Similarly, when the number of contact points 1011 is set to three, twenty-one arc baffle ribs 21 can be provided.

[0030] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A moving contact structure, comprising a contact assembly (1), an arc baffle (2), a contact support (3), a contact spring (4), a contact support (5), a contact support shaft (6), a stopper (7), a side plate, a contact shaft (10), a contact connecting rod shaft (11) and a contact connecting rod spring (12), wherein the contact assembly (1) comprises a busbar (103), a plurality of sheet-shaped braided wires (102) and a contact sheet (101) having the same number as the braided wires (102), wherein the contact sheets (101) are regularly installed on the busbar (103) through the braided wires (102) and a gap is left between each contact sheet (101), a spring groove is provided on the back of all the contact sheets (101), a shaft hole is provided at the same position in the middle of all the contact sheets (101), the contact shaft (10) passes through the shaft hole, a connecting rod hole is provided on the side of the contact support (3), and the contact The head connecting rod shaft (11), the contact connecting rod spring (12), and the stopper (7) are sequentially installed in the connecting rod hole. The side plate is fixed to the side of the contact support (3) by the second screw (9b) on the upper part and presses the stopper (7) into the connecting rod hole. The contact support (3) is regularly provided with a plurality of spring grooves facing the direction of the contact assembly (1). A plurality of contact springs (4) are installed in the spring grooves. The other end of the contact spring (4) is against the spring groove of the contact sheet (101). The arc baffle plate (2) and the contact support (5) are both in an N shape. The arc baffle plate (2) is sleeved on the contact assembly (1) from the front and is also fixed to the upper part of the side plate by the first screw (9a) on both sides. The bottom of the side plate and the two sides of the contact support (5) are provided with support shaft holes. The contact support (5) is sleeved on the outside of the bottom of the side plate from the rear and the two are connected together by the contact support shaft (6). It is characterized in that: The upper part of each contact sheet (101) is provided with a number of movable contacts (1011) greater than one in the same direction as the busbar (103), and the lower part is integral, with gaps between the movable contacts (1011), and arc baffle ribs (21) are regularly arranged on the bottom surface of the arc baffle plate (2) facing the direction of the contact assembly (1), the arc baffle ribs (21) extend into the gaps between the contact sheets (101), and the thickness of the arc baffle ribs (21) is less than the gap width.

2. The moving contact structure according to claim 1, characterized in that: The moving contact (1011) is welded to the upper part of the contact sheet (101).

3. The moving contact structure according to claim 1, characterized in that: The position where the moving contact (1011) is installed on the upper part of the contact sheet (101) is processed into the same number of support sheets perpendicular to the thickness direction and with gaps according to the number of the moving contacts (1011), and the lower ends of the separated support sheets are located lower than the lowest ends of the moving contacts (1011).

4. The moving contact structure according to claim 1, characterized in that: The upper part of the contact piece (101) is integral.

5. The moving contact structure according to claim 4, characterized in that: A notch is provided on one side of the bottom end of the contact sheet (101), and a protrusion matching the notch at the bottom end of the contact sheet (101) is provided on the same side of the top end of the braided wire (102), and the protrusion at the top end of the braided wire (102) is welded in the notch at the bottom end of the contact sheet (101).

6. The moving contact structure according to claim 5, characterized in that: The notches and the protrusions are both square.

7. The moving contact structure according to claim 1, characterized in that: The bottom end of the braided wire (102) has a protruding feature extending therefrom, and the upper rear portion of the busbar (103) is provided with regularly arranged sheet-shaped grooves, and all the braided wires (102) are welded in the grooves of the busbar (103) through the protruding features at the bottom end.

8. The moving contact structure according to claim 7, characterized in that: The protruding features at the bottom end of the braided wire (102) and the grooves on the busbar (103) are square.

9. The moving contact structure according to claim 3, characterized in that: Similar arc baffle ribs (21) are also arranged between adjacent arc baffle ribs (21) on the arc baffle plate (2). The arc baffle ribs (21) extend into between adjacent support plates. The thickness of the arc baffle ribs (21) is smaller than the gap between the two support plates.

10. The moving contact structure according to claim 3, characterized in that: The width of the moving contact (1011) is equal to the thickness of the support sheet.

Images