Moving contact mounting structure of switch

Abstract

A moving contact mounting structure of a switch belongs to the technical field of switches. The switch comprises a shell, a contact system is installed in the shell, the shell comprises a base and a bottom plate, the contact system comprises a moving contact and a static contact, the moving contact comprises a contact piece, a contact support, a wire outlet bar and a rotating shaft, the contact piece is installed on the contact support, the wire outlet bar is fixed to the base, and the wire outlet bar and the contact piece are in conductive connection through flexible connection. The moving contact is characterized in that the rotating shaft is in running fit with the base, one side, facing the rotating shaft, of the outgoing line bar is provided with a limiting part, and the limiting part is used for limiting the radial movement of the rotating shaft. The utility model has the advantages that the rotating shaft can be effectively prevented from moving during working, the breaking performance of the switch is improved, and the service life of the switch is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to switch technical field, and specifically relates to a movable contact mounting structure of switch. BACKGROUND

[0002] The universal circuit breaker is a common low-voltage electrical appliance, which is used for distributing electric energy and protecting lines and devices from hazards of short circuit, overload, single-phase grounding, under-voltage and the like.

[0003] The contact system is an important component of the circuit breaker, and its action reliability is related to the closing and opening reliability of the circuit breaker, so ensuring the movement reliability of the contact system is of great significance to improving the performance index of the circuit breaker.

[0004] The contact system comprises a movable contact and a static contact, the movable contact is installed on a base of the circuit breaker body, the two ends of the rotating shaft of the movable contact are positioned in cooperation with semicircular grooves arranged on the base, and the contact system can rotate around the rotating shaft. CONTENT OF THE UTILITY MODEL

[0005] The utility model discloses a movable contact mounting structure of switch, which is characterized by being provided with a limiting part on the outgoing line row of the movable contact in cooperation with the rotating shaft.

[0006] The utility model discloses a movable contact mounting structure of switch, which is characterized by being provided with a limiting part on the outgoing line row of the movable contact in cooperation with the rotating shaft.

[0007] In one specific embodiment of the utility model, the limiting portion has a first face; when the movable contact is installed in place, the first face is located above the rotating shaft, and the first face limits the radial movement of the rotating shaft upward.

[0008] In another specific embodiment of the utility model, the limiting portion has a second face; when the movable contact is installed in place, the second face is located on the side of the rotating shaft facing the base plate, and the second face limits the radial movement of the rotating shaft toward the side of the base plate.

[0009] In still another specific embodiment of the utility model, the limiting portion is an angular recess, and the limiting portion further includes a second face; when the movable contact is installed in place, the second face is located on the side of the rotating shaft facing the base plate, the first face is in contact with the rotating shaft, and the second face is in clearance fit with the rotating shaft.

[0010] In still another specific embodiment of the utility model, the base plate has a positioning groove in the inner cavity; the positioning groove is a pair of grooves located on the inner sides of a pair of side walls of the inner cavity of the base plate, and the positioning groove is in fit with both ends of the rotating shaft.

[0011] In still another specific embodiment of the utility model, the base plate further has an abutting surface in the inner cavity; the abutting surface is located on the bottom wall of the inner cavity of the base plate, and the abutting surface is an arc surface in fit with the side surface of the rotating shaft.

[0012] In still another specific embodiment of the utility model, the wire outlet row includes a connecting portion and a wire outlet portion; the connecting portion is used for fit with the flexible connector; the wire outlet portion is used for wire outlet; and the limiting portion is arranged on the connecting portion.

[0013] In still another specific embodiment of the utility model, the first face and the second face are both flat faces, and the first face is arranged at an angle with the second face.

[0014] In still another specific embodiment of the utility model, the movable contact further includes a side plate; the side plate is a pair of side plates, and the pair of side plates are respectively installed on both sides of the contact support; the contact sheet is rotatably arranged between the pair of side plates; and the rotating shaft is arranged between the pair of side plates.

[0015] In still another specific embodiment of the utility model, the first face is arranged at a right angle with the second face.

[0016] The utility model discloses a rotating shaft and base realize rotation cooperation, and the limiting portion that is equipped with cooperation with the rotating shaft is arranged on the outgoing line row of the movable contact, and the limiting portion is used for limiting the radial movement of the rotating shaft, and is used for preventing the rotating shaft from moving in the work, thereby improving the breaking performance of the switch and prolonging the service life of the switch. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a part schematic view of the switch in the utility model;

[0018] Figure 2 It is the schematic view of one side of the base of the utility model;

[0019] Figure 3 It is the schematic view of the other side of the base of the utility model;

[0020] Figure 4 It is the schematic view of one side of the movable contact of the utility model;

[0021] Figure 5 It is the schematic view of the other side of the movable contact of the utility model;

[0022] Figure 6 It is the three-dimensional schematic view of the outgoing line row of the utility model;

[0023] Figure 7 It is the schematic view of outgoing line row and base and pivot cooperation of the utility model;

[0024] Figure 8 It is a part schematic view of the switch in the utility model;

[0025] Figure 9 It is the schematic view of the mechanism side plate of the utility model;

[0026] Figure 10 It is the schematic view of the anti -rotation nut of the utility model.

[0027] In the drawing: 1. movable contact, 11. contact piece, 111. long contact piece, 112. short contact piece, 12. contact support, 13. outgoing line row, 131. connecting portion, 1311. limiting portion, 13111. first surface, 13112. second surface, 1312. mounting groove, 132. outgoing line portion, 14. side plate, 15. contact cover;2. base, 21. abutting surface, 22. positioning groove, 23. embedded nut, 24. protruding block;3. operating mechanism, 31. mechanism side plate, 311. flange, 312. positioning hole;4. anti -rotation nut, 41. screw hole, 42. insertion portion;100. rotating shaft;200. let recess. DETAILED DESCRIPTION

[0028] The utility model discloses a detailed description of the specific implementation of the utility model below combined with the drawings, but the description of the embodiment is not the limitation of the technical scheme, any according to the utility model concept form but not the substantial change should be regarded as the protection scope of the utility model.

[0029] In the following description, the concept of directionality (or orientation) of up, down, left, right, front and back is in the position state corresponding to the drawing, and the purpose is to facilitate the public to understand, so it cannot be understood as a special limitation on the technical solutions provided by the utility model.

[0030] As Figures 1 to 8 , the switch refers to the circuit breaker and the disconnector. The switch usually includes a shell, and a contact system placed in the shell, and an arc extinguishing chamber above the contact system. After an arc is generated on the contact system, the arc enters the arc extinguishing chamber and is extinguished in the arc extinguishing chamber. Specifically, the contact system includes a moving contact 1 and a stationary contact. The moving contact 1 acts to realize contact or separation with the stationary contact, thereby connecting or disconnecting the circuit. The shell includes a base 2 and a bottom plate, and the base 2 and the bottom plate are spliced with each other to form the shell. More specifically, the moving contact 1 is rotatably arranged on the base 2, and the stationary contact is fixedly installed on the bottom plate.

[0031] An operating mechanism 3 is installed on the outside of the shell. Specifically, the operating mechanism 3 is installed on the outside of the base 2.

[0032] As Figure 2 , the base 2 has an abutting surface 21 and a positioning groove 22 in the inner cavity. Specifically, the abutting surface 21 is located on the bottom wall of the inner cavity of the base 2, and the positioning groove 22 is a pair of positioning grooves, which are respectively located on the inner sides of a pair of side walls of the inner cavity of the base 2.

[0033] As Figure 2 , Figure 3 , an embedded nut 23 is installed on the outer side surface of the base 2. In order to meet the installation requirement of the embedded nut 23, a protrusion 24 is provided on the inner wall of the base 2, and the inside of the protrusion 24 is used for installing the embedded nut 23. The embedded nut 23 is used for installing the main shaft of the switch. Specifically, it further includes a clamp for fixing the main shaft, the clamp is fixed on the embedded nut 23, and the main shaft penetrates into the clamp, and the clamp defines the main shaft. The operating mechanism 3 drives the main shaft to rotate, and the main shaft drives the moving contact 1 to act.

[0034] As Figure 4 , Figure 5The moving contact 1 comprises a plurality of contact blades 11, a contact support 12, a wire outlet row 13, side plates 14 and a contact cover 15. The contact blades 11 are arranged side by side. Specifically, the contact blades 11 comprise long contact blades 111 and short contact blades 112. The long contact blades 111 have a longer extension length than the short contact blades 112. Generally, the long contact blades 111 serve as arc contact blades, and the short contact blades 112 serve as main contact blades. More specifically, the long contact blades 111 have arc contact points and main contact points, and the short contact blades 112 have only main contact points. When the moving contact 1 and the stationary contact are in the closed state, the main contact points contact corresponding stationary contact points, and the arc contact points are separated from corresponding stationary arc contact points. When the moving contact 1 and the stationary contact are separated, the arc contact points are separated from corresponding stationary arc contact points later than the main contact points are separated from corresponding stationary contact points. That is, during the separation process, the arc contact points and the stationary arc contact points are first contacted and then separated. Therefore, an arc is generated on the arc contact points and the stationary arc contact points.

[0035] Generally, the contact support 12 is made of insulating material. Preferably, the contact support 12 is made of thermosetting material, such as DMC, BMC, etc. The contact support 12 provides a mounting and positioning frame for the moving contact 1. The contact blades 11, the side plates 14 and the contact cover 15 are mounted and positioned in cooperation with the contact support 12.

[0036] The side plates 14 are also a pair, and are mounted on both sides of the contact support 12. The contact blades 11 are rotatably arranged between the side plates 14 by a pin shaft. Of course, the contact blades 11 can also be rotatably arranged on the contact support 12 by a pin shaft.

[0037] The side plates 14 are not necessary. If the side plates 14 are not provided, the functions of the side plates 14 are completed by the contact support 12. The contact blades 11 are mounted on the contact support 12, which means that the contact blades 11 are rotatably arranged between the side plates 14 by a pin shaft, and the side plates 14 are fixed on both sides of the contact support 12, or the contact blades 11 are directly mounted on the contact support 12 by a pin shaft.

[0038] The wire outlet row 13 is made of conductive material, preferably copper, for good conductivity. The wire outlet row 13 is fixedly installed on the base 2, specifically in the inner cavity of the base 2. The wire outlet row 13 is conductively connected to the contact tab 11 through a soft connection (not shown). The soft connection is usually made of copper braid. Of course, the soft connection can also be made of conductive sheet.

[0039] The contact cover 15 is made of insulating material and is installed on the contact support 12 or the side plate 14. When the movable contact 1 does not have the side plate 14, the contact cover 15 is directly installed on the contact support 12.

[0040] A rotating shaft 100 is installed at one end of the movable contact 1 close to the wire outlet row 13, which serves as the rotating center of the entire movable contact 1. In this embodiment, the rotating shaft 100 is arranged between a pair of side plates 14. Of course, if the movable contact 1 does not have the side plate 14, the rotating shaft 100 is arranged on the contact support 12.

[0041] The back side of the contact support 12, i.e. the side away from the contact tab 11, has a recessed cavity 200 for cooperating with the protrusion 24 on the base 2. Specifically, the recessed cavity 200 is used to clear the protrusion 24.

[0042] As shown in Figure 6 , the wire outlet row 13 includes a connecting portion 131 and a wire outlet portion 132, which are integrally arranged. The wire outlet portion 132 is used for wire outlet and usually has a plurality of fixing holes for connecting other conductive components to the wire outlet row 13 to achieve threaded fixing. The connecting portion 131 is used for cooperating with the soft connection, specifically for fixing, usually by welding, one end of the soft connection. The wire outlet row 13 itself is installed on the base 2. Specifically, the wire outlet row 13 is fixed on the base 2 by screws.

[0043] The connecting part 131 is provided with a limiting part 1311 for limiting the radial movement of the rotating shaft 100. The connecting part 131 is also provided with a mounting groove 1312. The mounting groove 1312 is used for fixing the flexible connection, specifically, one end of the flexible connection composed of copper braid is inserted into the mounting groove 1312 and is fixed by welding. The flexible connection is in multiple groups or multiple pieces, and the number of the mounting grooves 1312 is matched with the number of the groups or pieces of the flexible connection. Preferably, the limiting part 1311 is an angular pit having two faces, a first face 13111 and a second face 13112. In this embodiment, the first face 13111 and the second face 13112 are both flat faces. However, for the present application, the first face 13111 and the second face 13112 can also be flat faces with curvature.

[0044] As Figure 7 When the movable contact 1 is installed in place, the first face 13111 is located above the rotating shaft 100, and the second face 13112 is located on the side of the rotating shaft 100 facing the bottom plate. The first face 13111 and the second face 13112 are arranged at an angle, preferably forming a right angle. After the movable contact 1 is installed, the first face 13111 is closer to the rotating shaft 100 relative to the second face 13112. Specifically, after the movable contact 1 is installed, the first face 13111 is in contact with the rotating shaft 100, and the second face 13112 is in clearance fit with the rotating shaft 100. As other embodiments, for example, the second face 13112 is in contact with the rotating shaft 100, and the first face 13111 is in clearance fit with the rotating shaft 100; as another example, the first face 13111 is in contact with the rotating shaft 100, and the second face 13112 is in contact with the rotating shaft 100.

[0045] Considering the actual assembly requirements, contact should be a preferred way to limit the radial movement of the rotating shaft 100, i.e. limiting the radial movement includes contact and small clearance fit, which means the distance between the two is between 0.1 mm and 0.5 mm. The first face 13111 limits the upward radial movement of the rotating shaft 100, including contact or small clearance fit between the two. The second face 13112 limits the radial movement of the rotating shaft 100 towards the side of the bottom plate, including contact or small clearance fit between the two.

[0046] The rotating shaft 100 is matched with the abutting surface 21 and the positioning groove 22 of the base 2. Specifically, the two ends of the rotating shaft 100 are matched with the pair of positioning grooves 22, and the part between the two ends of the rotating shaft 100 is matched with the abutting surface 21. Preferably, the abutting surface 21 is an arc surface, and is matched with the side surface of the rotating shaft 100, so that the abutting surface 21 and the rotating shaft 100 have better limiting effect. Preferably, the positioning groove 22 is semicircular or arc-shaped, so that the positioning groove 22 is matched with the two ends of the rotating shaft 100. Preferably, the opening of the positioning groove 22 faces one side of the bottom plate.

[0047] In the embodiment, the wire outlet row 13 has a limiting part 1311 on the side facing the rotating shaft 100, and the limiting part 1311 is used to limit the radial movement of the rotating shaft 100. Specifically, the limiting part 1311 is in contact with the rotating shaft 100. The contact between the limiting part 1311 and the rotating shaft 100 limits the rotating shaft 100 during the entire working process of the rotating shaft 100.

[0048] As shown in Figure 8 , Figure 9 and Figure 10 , the operating mechanism 3 is installed on the outer side of the base 2. The operating mechanism 3 is an energy component of a switch, which drives the contact system to act, thereby realizing the closing and opening of the switch. The operating mechanism 3 includes a pair of mechanism side plates 31, which are arranged at intervals, and other components of the operating mechanism 3, such as spring assemblies, connecting rod assemblies, opening and closing latch assemblies, are installed between the mechanism side plates 31. The operating mechanism 3 is fixedly installed on the outer side of the base 2 by threads.

[0049] Specifically, the mechanism side plate 31 has a flange 311 on the side edge close to the base 2. In the height direction of the operating mechanism 3, the flange 311 preferably includes an upper flange and a lower flange. The upper flange and the lower flange are both used for the threaded fixing of the operating mechanism 3 and the base 2. In the structure, the upper flange and the lower flange are separated, and of course, they can be integrated. The upper flange has a positioning hole 312.

[0050] As shown in Figure 10 , the operating mechanism 3 further includes an anti-rotation nut 4, which is used for the fixing of the operating mechanism 3 and the base 2. Specifically, a screw is inserted from one side of the bottom plate, passes through the bottom plate, the base 2 and the flange 311, and is threadedly connected with the anti-rotation nut 4, thereby realizing the fixed installation of the operating mechanism 3.

[0051] The anti-rotation nut 4 has a threaded hole 41 for thread connection with a screw, and an insertion part 42 inserted into the positioning hole 312 to realize positioning and prevent the anti-rotation nut 4 from rotating, thereby improving the stability and reliability of the thread fixation.

[0052] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present application, and it should be pointed out that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should also be considered within the scope of protection of the present application.

[0053] In summary, the technical scheme provided by the present application makes up for the shortcomings in the prior art, successfully completes the utility model task, and truly realizes the technical effects described by the applicant in the technical effect column above.

Claims

1. A movable contact mounting structure of a switch, the switch comprising a housing in which a contact system is mounted, the housing comprising a base (2) and a bottom plate, and the contact system comprising a movable contact (1) and a stationary contact, the movable contact (1) comprising a contact blade (11), a contact support (12), a wire outlet row (13) and a rotation axis (100), the contact blade (11) being mounted on the contact support (12), the wire outlet row (13) being fixed on the base (2), the wire outlet row (13) being electrically connected to the contact blade (11) by a flexible connection, and the rotation axis (100) being the rotation center of the movable contact (1), characterized in that: The rotating shaft (100) is rotationally connected with the base (2), and the wire outlet row (13) has a limiting portion (1311) on the side facing the rotating shaft (100), and the limiting portion (1311) is used for limiting the radial movement of the rotating shaft (100). ​ 2. A movable contact mounting structure for a switch according to claim 1, characterized in that: The limiting portion (1311) has a first surface (13111), and when the movable contact (1) is installed in place, the first surface (13111) is located above the rotating shaft (100), and the first surface (13111) limits the upward radial movement of the rotating shaft (100).

3. The movable contact mounting structure of a switch according to claim 1, characterized by: The limiting portion (1311) has a second surface (13112), and when the movable contact (1) is installed in place, the second surface (13112) is located on the side of the rotating shaft (100) facing the bottom plate, and the second surface (13112) limits the radial movement of the rotating shaft (100) to the side of the bottom plate.

4. The movable contact mounting structure of a switch according to claim 2, characterized by: The limiting portion (1311) is an angular recess, and the limiting portion (1311) further comprises a second surface (13112); when the movable contact (1) is installed in place, the second surface (13112) is located on the side of the rotating shaft (100) facing the bottom plate, the first surface (13111) is in contact with the rotating shaft (100), and the second surface (13112) is in clearance fit with the rotating shaft (100).

5. The movable contact mounting structure of a switch according to claim 1, characterized by: The base (2) has a positioning groove (22) in the inner cavity, and the positioning groove (22) is a pair of positioning grooves (22) located on the inner sides of a pair of side walls of the inner cavity of the base (2), and the positioning groove (22) is matched with the two ends of the rotating shaft (100).

6. A movable contact mounting structure for a switch according to claim 5, wherein: The base (2) further has an abutting surface (21) in the inner cavity, and the abutting surface (21) is located on the bottom wall of the inner cavity of the base (2), and the abutting surface (21) is an arc surface and is matched with the side surface of the rotating shaft (100).

7. The movable contact mounting structure of a switch according to Claim 1, wherein: The wire outlet row (13) comprises a connecting portion (131) and a wire outlet portion (132), the connecting portion (131) is used for cooperating with the flexible connection, the wire outlet portion (132) is used for wire outlet, and the limiting portion (1311) is arranged on the connecting portion (131).

8. The movable contact mounting structure of a switch according to claim 4, characterized by: The first surface (13111) and the second surface (13112) are both flat surfaces, and the first surface (13111) and the second surface (13112) are arranged at an angle.

9. The movable contact mounting structure of a switch according to Claim 1, wherein: The movable contact (1) further comprises a side plate (14), and the side plate (14) is a pair of side plates (14) respectively installed on both sides of the contact support (12), the contact piece (11) is rotationally arranged between the pair of side plates (14), and the rotating shaft (100) is arranged between the pair of side plates (14).

10. The movable contact mounting structure of a switch according to claim 4, characterized by: The first surface (13111) and the second surface (13112) are arranged at a right angle.

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