CN216871828U - A direct-acting grounding switch and its moving end components - Google Patents

Abstract

The utility model belongs to the field of medium-high voltage electrical equipment, and particularly relates to a direct-acting grounding switch and a moving end part thereof. The moving end part of the direct-acting grounding switch comprises a rack, a three-phase moving contact is assembled on the rack in a guiding and moving manner, a main shaft for driving the moving contact to reciprocate is also assembled on the rack in a rotating manner, and a spring for driving the main shaft to rotate during switching-on is also arranged between the rack and the main shaft; the movable end part also comprises a gear and a rack, the gear is fixedly assembled on the main shaft, the rack is fixedly assembled on the movable contact, the main shaft drives the movable contact to reciprocate through the meshing of the gear and the rack, and the spring is a coil spring or a torsion spring sleeved on the main shaft. The moving contact adopts a driving mode of gear and rack transmission, and has smaller required installation space and higher transmission precision compared with a crank arm transmission mode; the main shaft is sleeved with the coil spring or the torsion spring, so that the energy storage of the spring can be realized during opening, the spring is quickly released during closing, the closing speed is improved, and the device is simple in structure, small in size and low in cost.

Description

A direct-acting grounding switch and its moving end components

technical field

The utility model belongs to the field of medium and high voltage electrical equipment, in particular to a direct-acting grounding switch and a moving end component thereof.

Background technique

Gas-insulated metal-enclosed switchgear has the characteristics of small size, safety and reliability, and low cost. It is widely used in the power industry. The grounding switch is used to ensure the safety of the circuit and plays a vital role in the safe operation of the product. With the continuous development of the power industry, gas-insulated metal-enclosed switchgear is developing towards miniaturization.

The traditional grounding switch uses a rotary knife switch mechanism, which uses the opening and closing of the contact and the contact knife to realize the opening and closing of the grounding switch. The action is not smooth; the blade-type structure has uneven distribution of the electric field, which is prone to partial discharge when the switch is opened, which is not conducive to the safe operation of the equipment. The knife switch has been put into use for many years, and the product is very mature, and it is difficult to further reduce the size, which is not conducive to the miniaturization of gas-insulated metal-enclosed switchgear.

In order to solve the problems existing in the rotary knife gate type grounding switch, the Chinese invention patent with the authorization announcement number CN104835674B discloses a direct-acting grounding switch, which includes a moving end part and a static end part, and the moving end of the direct-acting grounding switch. The components include a frame and a three-phase moving contact assembled on the frame. The frame is also rotatably installed with a main shaft. The main shaft drives the moving contact to reciprocate through the crank arm, and a spring is also installed between the main shaft and the frame. When the brake is opened, the spring drives the main shaft to rotate rapidly. Wherein, a guide groove is opened on the turning arm, a guide slider is fixed on the movable contact, and the guide slider is slidably assembled in the guide groove. The static end component includes a static contact, wherein the moving contact and the static contact are both circular contacts.

Although the direct-acting grounding switch in the prior art can solve the problems existing in the knife-switching grounding switch, it also has some drawbacks: the main shaft drives the moving contact to reciprocate through the crank arm, and the space occupied by the crank arm is large. It cannot meet the miniaturization design requirements of the grounding switch, and in order to ensure that there is no jamming between the guide slider and the guide groove, a gap needs to be reserved between the guide slider and the guide groove, which will lead to poor accuracy of the arm drive. dropped.

Utility model content

The purpose of the utility model is to provide a moving end component of a direct-acting grounding switch, so as to solve the problems of low transmission precision and large space occupation of the direct-acting grounding switch in the prior art.

The purpose of the present invention is also to provide a direct-acting grounding switch using the moving end component, so as to solve the above-mentioned technical problems.

In order to solve the above-mentioned problems, the moving end components of the direct-acting grounding switch of the present invention adopt the following technical solutions:

A moving end part of a direct-acting grounding switch, comprising a frame, on which a three-phase moving contact is assembled for guiding and moving, and a main shaft for driving the moving contact to reciprocate is also rotatably assembled on the frame. There is also a spring between the main shafts for driving the main shaft to rotate when closing; the moving end part of the direct-acting grounding switch also includes a gear and a rack, the gear is fixedly assembled on the main shaft, and the rack is fixedly assembled on the moving end. On the contact, the main shaft drives the movable contact to reciprocate through the meshing of gears and racks, and the spring is a coil spring or a torsion spring sleeved on the main shaft.

Beneficial effects: The moving end part of the direct-acting grounding switch of the present utility model, the moving contact adopts the driving mode of gear and rack transmission, and the gear only needs to rotate around its own axis to drive the rack to reciprocate, which is more than the one driven by the crank arm. This method takes up less space. The steering arm drive needs to be provided with a guide slider and a guide groove to change the direction of movement. In order to make the sliding between the guide slider and the guide groove flexible and smooth, there will be a A certain gap leads to low transmission accuracy. The transmission mode of gear rack and pinion solves this problem and improves the transmission accuracy; the coil spring or torsion spring is used to cover the main shaft, and the required installation position is small. It can realize the energy storage of the spring, release it quickly when closing, improve the closing speed, the overall structure is simple, the size is small, and the cost is low.

Further, the moving end part of the direct-acting grounding switch also includes a guide rod arranged in parallel with the main shaft, each phase moving contact is fixed on the guide rod, and the frame is provided with a guide rod that guides and cooperates with the guide rod. A guide groove, the guide groove is extended and arranged along the reciprocating movement direction of the movable contact. The guide rod is fixedly connected with the three-phase moving contact at the same time, and the reciprocating movement of the three-phase moving contact can be guided at the same time through the guiding cooperation between the guide rod and the guide groove on the frame, which can improve the action synchronization of the moving contact. There is good linkage between them.

Furthermore, each movable contact is provided with the rack, and the gear is fixed on the main shaft at a position corresponding to each rack. Compared with the method of setting a rack on only one moving contact, all three moving contacts are provided with a rack and correspondingly three gears, so as to avoid the concentration of the force on a certain moving contact, reduce mechanical wear, and improve the Mechanical life, and the three-phase moving contacts are directly stressed at the same time, which can make the moving contacts move more smoothly.

Further, a groove is provided on one side of the movable contact, and the rack is embedded and fixed in the groove. The rack is embedded in the movable contact, so that the gear can partially extend into the rack, which further saves the installation space and facilitates the miniaturization design requirements of the mechanism.

Further, the moving end component of the direct-acting grounding switch also includes a flow guide component, and the flow guide component includes a bus bar fixed on the frame, and three conductive blocks connected to the bus bar, each phase moving contact. The head passes through the corresponding conductive block, and the conductive block is provided with a spring contact finger which is in conductive contact with the movable contact. The arrangement of the diversion component can make the moving contact and the load connected with the moving contact more reliably grounded, and improve the safety; the spring contact finger is in close contact with the moving contact, which improves the guidance and helps to improve the movement accuracy of the moving contact. Better electrical conductivity.

The direct-acting grounding switch of the present invention adopts the following technical solutions:

A direct-acting earthing switch includes a moving end part and a static end part, the static end part includes a static contact, and the moving end part of the direct-acting earthing switch includes a frame on which a three-phase moving contact is guided and moved. The main shaft for driving the reciprocating movement of the movable contact is also rotatably assembled on the frame, and a spring for driving the main shaft to rotate when closing is also provided between the frame and the main shaft; the moving end components of the direct-acting grounding switch also include Gear and rack, the gear is fixed on the main shaft, the rack is fixed on the moving contact, the main shaft drives the moving contact to reciprocate through the meshing of the gear and the rack, and the spring is sleeved on the main shaft. Coil or torsion springs.

Beneficial effects: The direct-acting grounding switch of the present utility model adopts the driving mode of gear and rack transmission for the moving contact, and the gear only needs to rotate around its own axis to drive the rack to move back and forth, which takes up more space than the arm transmission method. Smaller, the steering arm drive needs to be provided with a guide slider and a guide groove to change the direction of movement. In order to make the sliding between the guide slider and the guide groove flexible and smooth, there will be a certain gap between the guide slider and the guide groove This leads to low transmission accuracy. The transmission mode of gear rack cooperation solves this problem and improves the transmission accuracy; the coil spring or torsion spring is used to cover the main shaft, the required installation position is small, and the spring can be realized when the brake is opened. The energy storage, the quick release when closing, improve the closing speed, the overall structure is simple, the size is small, and the cost is low.

Further, the moving end part of the direct-acting grounding switch also includes a guide rod arranged in parallel with the main shaft, each phase moving contact is fixed on the guide rod, and the frame is provided with a guide rod that guides and cooperates with the guide rod. A guide groove, the guide groove is extended and arranged along the reciprocating movement direction of the movable contact. The guide rod is fixedly connected with the three-phase moving contact at the same time, and the reciprocating movement of the three-phase moving contact can be guided at the same time through the guiding cooperation between the guide rod and the guide groove on the frame, which can improve the action synchronization of the moving contact. There is good linkage between them.

Furthermore, each movable contact is provided with the rack, and the gear is fixed on the main shaft at a position corresponding to each rack. Compared with the method of setting a rack on only one moving contact, all three moving contacts are provided with a rack and correspondingly three gears, so as to avoid the concentration of the force on a certain moving contact, reduce mechanical wear, and improve the Mechanical life, and the three-phase moving contacts are directly stressed at the same time, which can make the moving contacts move more smoothly.

Further, a groove is provided on one side of the movable contact, and the rack is embedded and fixed in the groove. The rack is embedded in the movable contact, so that the gear can partially extend into the rack, which can further save the installation space and facilitate the miniaturization design requirements of the mechanism.

Further, the moving end component of the direct-acting grounding switch also includes a flow guide component, and the flow guide component includes a bus bar fixed on the frame, and three conductive blocks connected to the bus bar, each phase moving contact. The head passes through the corresponding conductive block, and the conductive block is provided with a spring contact finger which is in conductive contact with the movable contact. The arrangement of the diversion component can make the moving contact and the load connected with the moving contact more reliably grounded, and improve the safety; the spring contact finger is in close contact with the moving contact, which improves the guidance and helps to improve the movement accuracy of the moving contact. Better electrical conductivity.

Description of drawings

Fig. 1 is the structure diagram of the moving end part of the direct-acting grounding switch of the present invention;

FIG. 2 is an assembly diagram of a moving contact and a rack in the direct-acting grounding switch of the present invention.

Description of reference numbers:

1. Moving contact; 2. Rack; 21. Rack side plate; 22. Rack support plate; 221. Guide groove; 23. Rack bottom plate; Spring; 5, guide rod; 6, bearing; 7, bushing; 8, guide part; 81, busbar; 82, conductive block; 9, rack; 10, gear.

Detailed ways

The utility model will be further clarified below in conjunction with the drawings.

The specific embodiment of the moving end component of the direct-acting grounding switch of the present invention:

As shown in Figure 1, the moving end components of the direct-acting grounding switch include a moving contact 1, a frame 2, a main shaft 3, a coil spring 4, a guide rod 5, a bearing 6, a shaft sleeve 7, a guide member 8, and a rack. 9. Gear 10. The guide member 8 includes a bus bar 81 , a conductive block 82 and a spring contact finger (not shown in the figure). For convenience of description, in this embodiment, it is defined that the main shafts 3 are arranged in the left-right direction, and the movable contacts 1 are arranged in the front-rear direction.

As shown in FIG. 1 , the rack 2 includes a rack side plate 21 , a rack support plate 22 , a rack bottom plate 23 , and a rack back plate 24 . A rack back plate 24 is vertically fixed on the rear side of the rack bottom plate 23 . The left and right sides of the bottom plate 23 are vertically fixed with the rack side plates 21 , the lower ends of the rack side plates 21 and the rack back plate 24 are fixed on the rack bottom plate 23 , and the left and right sides of the rack back plate 24 are vertically fixed with the rack side plates 21 Two frame support plates 22 are arranged in parallel between the two frame side plates 21, the lower end of the frame support plates 22 is fixed on the frame bottom plate 23, and the frame support plates 22 are guided along the moving direction of the moving contact 1. The groove 221 , the guide rod 5 passes through the middle of the guide groove 221 , and the guide groove 221 supports and guides the guide rod 5 .

The main shaft 3 extends in the left-right direction. The main shaft 3 is a hexagonal shaft. Three gears 10 and five hexagonal bushings 7 are fitted on the main shaft 3 , and a gear 10 is arranged between every two bushings 7 . The hexagonal shaft sleeve 7 has hexagonal holes inside and is fixedly sleeved on the main shaft 3, and the outside is a circular outer periphery. There are round holes for the main shaft 3 to pass through. The main shaft 3 is fitted inside these round holes, and is supported on the frame 2 through the bearing 6. The main shaft 3 can rotate around its own axis.

Both ends of the main shaft 3 are respectively sheathed with a coil spring 4, and the coil spring 4 is located outside the frame side plate 21, wherein the coil spring 4 is connected to the main shaft 3 and the frame side plate 21, and its fixing method is the same as that of the coil spring in the prior art. The arrangement is the same and will not be repeated here. When the main shaft 3 rotates, it can drive the coil spring 4 to contract to store energy.

As shown in FIG. 1 , there is a conductive block 82 corresponding to each movable contact 1. The conductive block 82 has a stepped structure. The part with the smaller outer diameter penetrates into the back plate 24 of the chassis, and the part with the larger outer diameter is located at Outside the rack back panel 24 , the step formed by the two parts is pressed against the side surface of the rack back panel 24 . The bus bar 81 and the rack backplane 24 are parallel to each other. During assembly, bolts pass through the busbar 81 and the larger outer diameter part of the conductive block 82 and the rack backplane 24, and are fastened with nuts, so that the conductive block 82 and the busbar are fastened. The bars 81 are all fixed on the rack backplane 24, and the conductive blocks 82 and the bus bars 81 are also electrically connected. The bus bar 81 , the conductive block 82 and the rack backplane 24 are all provided with perforations for the moving contacts 1 to pass through. A ring groove is opened inside the conductive block 82 and a spring contact finger is installed, so that the movable contact 1 is kept in conductive communication with the conductive block 82 after passing through.

As shown in FIG. 1 , the three-phase moving contacts 1 are arranged side by side along the extension direction of the main shaft 3 , and one end of the three-phase moving contacts 1 is fixed on the guide rod 5 by bolts. Synchronous action of the phase contact 1.

As shown in FIG. 2 , a groove is formed under the movable contact 1 , and the rack 9 is embedded in the groove. At the same time, the movable contact 1 is provided with a countersunk hole communicating with the groove, and the rack 9 is fixed on the movable contact 1 by a countersunk screw.

In this embodiment, in order to drive the main shaft 3 to rotate to drive the movable contact 1 to move in the direction of opening, the moving end part of the direct-acting grounding switch is also equipped with a motor, and the motor is connected to the main shaft 3 in a driving manner. At the same time, since the coil spring 4 will drive the main shaft 3 to rotate in the reverse direction, in order to prevent the main shaft 3 from driving the motor in the reverse direction, a structure such as a clutch is arranged between the motor and the main shaft 3 .

The transmission mode of the moving end component of the direct-acting grounding switch described in this embodiment is as follows:

The motor drives the main shaft 3 to rotate counterclockwise around its own axis, the main shaft 3 drives the gear 10 installed on the main shaft 3 to rotate, and the gear 10 drives the rack 9 to translate in the forward direction, realizing the transformation from rotation to translation, and the rack 9 drives The moving contact 1 moves forward to complete the opening operation of the direct-acting grounding switch and the energy storage of the coil spring 4 . When closing, the coil spring 4 releases energy, generates torque, drives the main shaft 3 to rotate clockwise along its own axis, drives the moving contact 1 to move backward, and completes the closing operation of the direct-acting grounding switch.

In this embodiment, the coil spring 4 is used as the spring. In other embodiments, the spring may also be a torsion spring.

In this embodiment, the main shaft 3 adopts a hexagonal shaft. In other embodiments, the main shaft 3 can also be a shaft of other shapes, such as a cylindrical shaft and a pentagonal shaft.

In this embodiment, each movable contact 1 is provided with a rack 9, and each rack 9 corresponds to a gear 10. In other embodiments, when the movable contacts 1 are fixed together, they can only be One of the movable contacts 1 is provided with a rack 9 and equipped with a gear 10 to drive the synchronous action of the three-phase movable contacts 1; of course, a rack 9 can also be provided on two of the movable contacts 1 and equipped with two gears 10.

In this embodiment, the three-phase moving contacts 1 are fixed together by the guide rod 5 , and the guide assembly with the frame 2 is realized by the cooperation of the guide rod 5 and the guide groove 221 . In other embodiments, the three-phase moving contacts 1 are individually guided and matched with the frame 2. For example, two guide rings are fixed along the front and rear directions at positions corresponding to each phase moving contact 1 on the frame 2. The front and rear ends of the head 1 are inserted into the guide ring; it should be noted that, at this time, since the moving contacts 1 of each phase move independently, racks and corresponding gears need to be provided on each moving contact 1 .

In this embodiment, a groove is provided on one side of the movable contact 1, and the rack 9 is embedded and fixed in the groove by a countersunk screw. In other embodiments, the rack 9 can be fixed in the groove of the movable contact 1 in a forced manner; in other embodiments, the groove on one side of the movable contact 1 is cancelled, and the A plane is opened on one side, and the rack 9 is fixed and installed on the plane by screws.

In this embodiment, the flow guide member 8 includes a bus bar 81 and a conductive block 82 corresponding to each phase moving contact 1 , and the conductive block 82 is fixed with a spring contact finger. In other embodiments, the conductive block 82 is eliminated, and spring contact fingers are provided in the bus bar 81 to ensure the conductive contact with the movable contact 1 .

The specific embodiment of the direct-acting grounding switch of the present invention:

The direct-acting grounding switch includes a moving-end component and a static-end component. The structure of the moving-end component is the same as that of the moving-end components of the above-mentioned direct-acting grounding switch, and will not be repeated here. The static end component includes a static contact. Preferably, the static contact is a self-operated contact. The self-operated contact is matched with the moving contact. During the bonding process, the holding pressure gradually increases from small to large, which is a changing process. It is not only beneficial for the moving contact to enter the static contact, but also for the close combination between the contacts, the action process is smoother, the jamming phenomenon is not easy to occur, and the operation safety is greatly improved. When the direct-acting grounding switch is in the closed state, the moving contact 1 is connected to the static contact, the equipment forms a loop with the ground, and the charge is introduced into the ground, and the moving contact 1 is connected to the bus bar 81 through the spring contact finger and the conductive block 82. , a metal conductor is used to connect the bus bar 81 to the ground, so that the equipment can be grounded more reliably.

Claims (10)

1. A moving end part of a direct-acting grounding switch comprises a rack (2), wherein a three-phase moving contact (1) is assembled on the rack (2) in a guiding and moving manner, a main shaft (3) used for driving the moving contact (1) to reciprocate is also assembled on the rack (2) in a rotating manner, and a spring used for driving the main shaft (3) to rotate during switching-on is also arranged between the rack (2) and the main shaft (3); the method is characterized in that: the moving end component of the direct-acting grounding switch further comprises a gear (10) and a rack (9), the gear (10) is fixedly assembled on the main shaft (3), the rack (9) is fixedly assembled on the moving contact (1), the main shaft (3) drives the moving contact (1) to move in a reciprocating mode through meshing of the gear (10) and the rack (9), and the spring is a coil spring (4) or a torsion spring sleeved on the main shaft (3).

2. The moving end member of the direct acting earthing switch according to claim 1, characterized in that: the moving end part of the direct-acting grounding switch further comprises a guide rod (5) arranged in parallel with the main shaft (3), each moving contact (1) is fixed on the guide rod (5), a guide groove (221) matched with the guide rod (5) in a guiding mode is formed in the rack (2), and the guide groove (221) extends along the reciprocating moving direction of the moving contact (1).

3. The moving end member of the direct acting earthing switch according to claim 2, characterized in that: the moving contacts (1) are respectively provided with the rack (9), and the main shaft (3) is fixedly provided with the gear (10) corresponding to the position of each rack (9).

4. The moving end member of the direct acting earthing switch according to any one of claims 1-3, characterized in that: one side of the moving contact (1) is provided with a groove, and the rack (9) is embedded and fixedly arranged in the groove.

5. The moving end member of the direct acting earthing switch according to any one of claims 1-3, characterized in that: the moving end component of the direct-acting grounding switch further comprises a flow guide component (8), the flow guide component (8) comprises a busbar (81) fixedly arranged on the rack (2) and three conductive blocks (82) connected with the busbar (81), each moving contact (1) penetrates through the corresponding conductive block (82), and a spring contact finger in conductive contact with the moving contact (1) is installed in each conductive block (82).

6. A direct-acting type grounding switch comprises a moving end part and a static end part, wherein the static end part comprises a static contact, the moving end part of the direct-acting type grounding switch comprises a rack (2), a three-phase moving contact (1) is assembled on the rack (2) in a guiding and moving manner, a main shaft (3) for driving the moving contact (1) to reciprocate is also assembled on the rack (2) in a rotating manner, and a spring for driving the main shaft (3) to rotate during switching on is also arranged between the rack (2) and the main shaft (3); the method is characterized in that: the moving end component of the direct-acting grounding switch further comprises a gear (10) and a rack (9), the gear (10) is fixedly assembled on the main shaft (3), the rack (9) is fixedly assembled on the moving contact (1), the main shaft (3) drives the moving contact (1) to move in a reciprocating mode through meshing of the gear (10) and the rack (9), and the spring is a coil spring (4) or a torsion spring sleeved on the main shaft (3).

7. The direct-acting earthing switch according to claim 6, characterized in that: the moving end part of the direct-acting grounding switch further comprises a guide rod (5) arranged in parallel with the main shaft (3), each moving contact (1) is fixed on the guide rod (5), a guide groove (221) matched with the guide rod (5) in a guiding mode is formed in the rack (2), and the guide groove (221) extends along the reciprocating moving direction of the moving contact (1).

8. The direct-acting earthing switch according to claim 7, characterized in that: the moving contacts (1) are respectively provided with the rack (9), and the main shaft (3) is fixedly provided with the gear (10) corresponding to the position of each rack (9).

9. A direct-acting earthing switch according to any of claims 6-8, characterized in that: one side of the moving contact (1) is provided with a groove, and the rack (9) is embedded and fixedly arranged in the groove.

10. A direct-acting earthing switch according to any of claims 6-8, characterized in that: the moving end component of the direct-acting grounding switch further comprises a flow guide component (8), the flow guide component (8) comprises a busbar (81) fixedly arranged on the rack (2) and three conductive blocks (82) connected with the busbar (81), each moving contact (1) penetrates through the corresponding conductive block (82), and a spring contact finger in conductive contact with the moving contact (1) is installed in each conductive block (82).

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