A voltage transformer and its claw type moving contact

Abstract

The present invention discloses a claw-type moving contact for a voltage transformer, comprising a fixed column for connecting with the voltage transformer, a hook mechanism for gripping a static contact provided on the outer periphery of the fixed column, and a movable contact located on the inner side of the hook mechanism and for abutting against the static contact at the front end of the fixed column. When the claw-type moving contact is connected with the static contact, the hook mechanism can grip the outer periphery of the static contact to prevent it from falling off. The movable contact abuts against the static contact, and the process of connecting the two does not require excessive force, and will not cause damage to the fuse or other protective elements. This improves the safety and stability of the connection process. The present invention also provides a voltage transformer including the above-mentioned claw-type moving contact, and has the above-mentioned advantages.

Description

Technical Field

[0001] The present invention relates to the technical field of power protection equipment, and in particular to a claw-type moving contact. The present invention also relates to a voltage transformer comprising the claw-type moving contact. Background Art

[0002] The generator output voltage transformer is an important part of the generator relay protection. The voltages for generator protection, metering and measurement are all taken from the voltage transformer. If any problem occurs in the voltage transformer, the generator must be shut down for processing, which has very serious consequences.

[0003] The voltage transformer widely used at home and abroad is a plug-in structure, that is, the moving contact spring coil is used to hold and press the static contact for conductive contact. When the transformer is pushed in or pulled out, there is a large force during manual or electric plug-in and pull-out, and there is a problem of poor contact. The insulator and the supporting mechanism will also tilt inside and outside and deform due to the force. The deformation of the insulator directly causes the distance between the two ends of the fuse to change, causing the fuse to fall off or poor contact. Once the fuse falls off, it will cause the secondary voltage of the generator to be disconnected or short-circuited, which will cause the relay protection to malfunction or alarm, and the metering and measurement circuits will be unable to calculate power and other serious consequences.

[0004] Therefore, how to prevent the fuse from falling off is a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0005] The purpose of the present invention is to provide a claw-type moving contact, which can grasp the stationary contact by a hook mechanism and realize electrical connection by abutting the moving contact against the stationary contact. The connection process is convenient and can avoid damage to the fuse.

[0006] To achieve the above-mentioned purpose, the present invention provides a claw-type moving contact for a voltage transformer, comprising a fixed column connected to the voltage transformer, the outer periphery of the fixed column is provided with a claw mechanism for grasping a static contact, and the front end of the fixed column is provided with a movable contact located on the inner side of the claw mechanism and used to resist the static contact.

[0007] Preferably, the hook mechanism includes a connecting plate sleeved on the outer periphery of the fixed column, a hook for grasping the static contact and a connecting rod connecting the connecting plate and the hook, one end of the connecting rod is hinged to the connecting plate, and the other end is hinged to the rear end of the hook, the hook includes a claw body and a rod-shaped connecting part, and the connecting parts of all the hooks are hinged to the contact plate.

[0008] Preferably, a support plate is provided at the front end of the fixing column, the support plate has a first through hole axially extending through the fixing column, the center of the contact plate has a second through hole extending through the thickness direction, and the movable contact passes through the first through hole and the second through hole.

[0009] Preferably, a support spring is provided on the outer periphery of the movable contact, a limiting boss extending radially outward is provided at the front end of the movable contact, one end of the support spring abuts against the support plate, and the other end abuts against the limiting boss.

[0010] Preferably, the fixing column is tubular, the rear end of the movable contact extends to the inner side of the fixing column, the side wall of the fixing column is provided with a limiting hole parallel to the axial direction, and the rear end of the movable contact is provided with a limiting protrusion matching with the limiting hole.

[0011] Preferably, a locking spring is sleeved on the rear of the support column, and the locking spring abuts against the connecting plate.

[0012] Preferably, the fixing column is provided with a limiting portion for axially limiting the connecting plate.

[0013] The present invention also provides a voltage transformer, comprising any one of the above-mentioned claw-type moving contacts.

[0014] The claw-type moving contact provided by the present invention is used for a voltage transformer, and includes a fixed column connected to the voltage transformer. The outer periphery of the fixed column is provided with a claw mechanism for grasping the static contact, and the front end of the fixed column is provided with a movable contact located on the inner side of the claw mechanism and used to resist the static contact.

[0015] When the claw-type moving contact is connected to the stationary contact, the claw mechanism can grasp the outer periphery of the stationary contact to prevent it from falling off. The moving contact and the stationary contact are against each other, and the process of connecting the two does not require excessive force, which will not cause damage to the fuse or other protective components. This improves the safety and stability of the connection process.

[0016] The present invention also provides a voltage transformer including the claw-type moving contact and having the above advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of the moving contact provided by the present invention;

[0019] Figure 2 for Figure 1 Schematic diagram of the structure in which the moving contact is assembled in the voltage transformer.

[0020] in, Figure 1 and Figure 2 The reference numerals in the drawings are:

[0021] Fixed column 1, connecting plate 2, connecting rod 3, hook claw 4, contact plate 5, support plate 6, movable contact 7, locking spring 8, static contact 9, fixing bolt 10, limiting hole 11, trolley 12, fuse 13, coil 14. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] Please refer to Figure 1 and Figure 2 , Figure 1 A schematic diagram of the structure of the moving contact provided by the present invention; Figure 2 for Figure 1 Schematic diagram of the structure in which the moving contact is assembled in the voltage transformer.

[0025] The claw-type moving contact provided by the present invention is used in a voltage transformer to connect the static contact 9 of other equipment. Figure 1 As shown, the claw-type moving contact includes a fixed column 1, a claw mechanism and a movable contact 7. Among them, the fixed column 1 is used to connect with the fuse 13, and the claw mechanism is arranged on the periphery of the fixed column 1 and extends to the front of the fixed column 1. The front end of the fixed column 1 is provided with a movable contact 7, and the movable contact 7 extends to the front of the fixed column 1 and adopts a retractable structure. The claw mechanism is also distributed on the periphery of the movable contact 7. The claw mechanism can open and grasp the static contact 9, and the movable contact 7 abuts against the static contact 9 after the claw mechanism grasps the static contact 9. At the same time, the movable contact 7 can be connected to the fuse 13 through a wire or other mechanism, thereby realizing the connection between the static contact 9 and the voltage transformer.

[0026] Optionally, the hook mechanism includes a connecting plate 2, a touch plate 5, a connecting rod 3 and a hook 4. The hook 4 includes a claw body and a rod-shaped connecting portion, the rear end of the claw body is connected to the rear end of the connecting portion, and the two are roughly V-shaped. The connecting portion is located on the side close to the axis of the fixed column 1. The connecting plate 2 is sleeved on the outer periphery of the fixed column 1, and the hook 4 is connected to the connecting plate 2 through the connecting rod 3. Specifically, one end of the connecting rod 3 is hinged to the connecting plate 2, and the other end is hinged to the rear end of the hook 4. The front end of the connecting portion of the hook 4 is hinged to the touch plate 5. The hook mechanism is usually provided with more than three hooks 4, all of which are evenly distributed along the circumference of the fixed column 1. The connecting rod 3 and the connecting portion are similar to a two-link 3 mechanism, and the swing of the connecting rod 3 can drive the hook mechanism to open and close. Of course, the user can also omit the connecting plate 2 as needed and directly hinge the connecting rod 3 to the fixed column 1, but the technical solution with the connecting plate 2 is convenient for processing and assembly.

[0027] Optionally, a support plate 6 is provided at the front end of the fixed column 1, and the support plate 6 has a first through hole that penetrates the fixed column 1 axially, and a second through hole that penetrates the center of the touch plate 5 in the thickness direction, and the movable contact 7 passes through the first through hole and the second through hole and is in clearance with the two. At this time, the centers of the first through hole and the second through hole are both located on the axis of the fixed shaft, and the clearances between the first through hole, the second through hole and the movable contact 7 are small, so the touch plate 5 can only move along the axial direction of the fixed column 1 under the limitation of the movable contact 7. The front and rear ends of the movable contact 7 can be limited by a boss or a protruding mechanism to prevent the front and rear ends from slipping out of the second through hole and the first through hole.

[0028] Optionally, a support spring is provided on the periphery of the movable contact 7, and a limiting boss extending radially outward is provided at the front end of the movable contact 7, and the limiting boss can be engaged with the periphery of the second through hole to play a limiting role. One end of the support spring abuts against the support plate 6, and the other end abuts against the limiting boss, and the movable contact 7 always extends forward under the push of the support spring. When the movable contact 7 is in contact and connected with the static contact 9, the support spring is compressed, and the support spring can increase the fitting force between the movable contact 7 and the static contact 9 to ensure good contact between the two. In addition, the movable contact 7 can adopt a hollow structure to reduce its mass. Although the support spring is located between the movable contact 7 and the side wall of the second through hole when passing through the second through hole, the expansion and contraction of the support spring will not be affected due to the light mass of the movable contact 7.

[0029] Furthermore, the fixed column 1 is tubular, and the rear end of the movable contact 7 extends to the inner side of the fixed column 1. The side wall of the fixed column 1 is provided with a limiting hole 11 parallel to the axial direction, and the rear end of the movable contact 7 is provided with a limiting protrusion that cooperates with the limiting hole 11. Specifically, the limiting protrusion can be a screw connected to the rear end of the movable contact 7, and the movable contact 7 is provided with a connecting hole for connecting the screw. During assembly, the movable contact 7 is first passed through the second through hole and the first through hole, and the connecting hole is aligned with the limiting hole 11, and then connected to the connecting hole by a screw. The screw cooperates with the limiting hole 11 to limit the moving range of the movable contact 7.

[0030] Optionally, in order to ensure that the hook mechanism can grasp the static contact 9, a locking spring 8 is sleeved on the rear of the support column. The locking spring 8 abuts against the connecting plate 2 and pushes the connecting plate 2 to move forward. Figure 1 As shown, when the connecting plate 2 moves forward, the connecting rod 3 swings away from the axis of the fixed column 1, and the front end of the claw body swings toward the axis of the fixed column 1, thereby grasping the static contact 9. Since the locking spring 8 can push the connecting plate 2 forward, the claw-type moving contact can always maintain a firm connection with the static contact 9, reducing the risk of loosening of the connection.

[0031] In addition, in order to prevent the claw mechanism from swinging too much due to the push of the locking spring 8 before use, the fixed column 1 is provided with a limiter. The limiter can axially limit the connecting plate 2, so that the diameter of the circumference of the front end of the claw body is greater than a preset value, which is smaller than the diameter of the static contact 9. Figure 1 The diameter of the middle part of the middle fixed column 1 is increased to form a limiting part, and the connection plate 2 is limited by the change of the diameter of the fixed column 1. Of course, the user can also set a limiting ring and other structures as needed, which is not limited here.

[0032] Furthermore, a slope can be provided at the front end of the claw body to facilitate connection with the static contact 9. Specifically, the side surface of the front end of the claw body close to the axis of the fixed column 1 is a mating surface that cooperates with the static contact 9, and the distance between the mating surface and the axis of the fixed column 1 gradually decreases from the front to the back, and a conical space is formed inside the mating surface of all the claw bodies. When the connecting plate 2 is located at the limit position, the diameter of the front end of the conical space is greater than the diameter of the static contact 9, and the diameter of the rear end of the conical space is less than the diameter of the static contact 9. Therefore, when the claw-type moving contact is connected to the static contact 9, the mating surface can play a guiding role, and the operator can push the claw-type moving contact forward to facilitate connection.

[0033] During use, the operator aligns the claw-type moving contact with the static contact 9 and pushes the static contact 9 forward. The claw mechanism can automatically grasp the static contact 9, and the movable contact 7 is tightly fitted with the static contact 9 under the push of the support spring. When disconnecting the static contact 9 and the claw-type moving contact, the operator holds the connecting rod 3 to open the front end of the claw mechanism, and then moves the claw-type moving contact backward to disconnect. The claw-type moving contact is subjected to less force during the connection and disconnection process, thereby preventing the fuse 13 and other components in the voltage transformer from being damaged due to excessive force. Of course, when the claw-type moving contact is connected to the static contact 9, the front end of the claw mechanism can also be opened by grasping the connecting rod 3, and then the claw mechanism is connected to the static contact 9. In addition, in order to improve the safety of operation, the claw mechanism and the fixed column 1 can be made of insulating materials, and the movable contact 7 is connected to the fuse 13 through a wire arranged in the fixed column 1.

[0034] The present invention also provides a voltage transformer, including any one of the above-mentioned claw-type moving contacts. The voltage transformer also includes a coil 14, a fuse 13 and a fixing bolt 10, the fixing column 1 in the claw-type moving contact is connected to the fixing bolt 10, the wire in the claw-type moving contact is connected to the fuse 13, and the fuse 13 is connected to the coil 14. The connection method of the coil 14, the fuse 13, the wire, etc. can refer to the existing technology and will not be repeated here. The connection method between the fixing bolt 10 and the fixing column 1 can also refer to the connection method between the plug-in mechanism and the fixing bolt 10 in the existing voltage transformer. The voltage transformer can be set on a trolley 12, and the operator can complete the connection between the claw-type moving contact and the static contact 9 by pushing the trolley 12, making the operation process easier.

[0035] In this embodiment, the claw-type moving contact grasps the outer periphery of the stationary contact 9 through the hook mechanism, and at the same time pushes the connecting plate 2 through the locking spring 8, so that the hook mechanism grasps the stationary contact 9 firmly, ensuring the firmness of the connection, and the force on the stationary contact 9 is more uniform. The movable contact 7 in the claw-type moving contact is closely fitted with the stationary contact 9 under the push of the support spring, and the thrust of the support spring ensures good contact between the claw-type moving contact and the stationary contact 9.

[0036] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0037] The claw-type moving contact provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A claw-type moving contact for a voltage transformer, characterized in that: It comprises a fixed column (1) for connecting to the voltage transformer, the outer periphery of the fixed column (1) is provided with a hook mechanism for grasping the stationary contact (9), and the front end of the fixed column (1) is provided with a movable contact (7) located on the inner side of the hook mechanism and for abutting against the stationary contact (9); The hook mechanism comprises a touch plate (5), a connecting rod (3) and a hook (4); the hook (4) comprises a claw body and a rod-shaped connecting portion, the rear end of the claw body is connected to the rear end of the connecting portion, and the connecting portion is located on a side close to the axis of the fixed column (1); one end of the connecting rod (3) is hinged to the fixed column (1), and the other end is hinged to the rear end of the hook (4); the front end of the connecting portion is hinged to the touch plate (5); A support plate (6) is provided at the front end of the fixed column (1), the support plate (6) having a first through hole penetrating axially along the fixed column (1), and the movable contact (7) passes through the first through hole; A support spring is provided on the outer periphery of the movable contact (7), a limiting boss extending radially outward is provided at the front end of the movable contact (7), one end of the support spring abuts against the support plate (6), and the other end abuts against the limiting boss; Furthermore, the movable contact (7) is always extended forward under the push of the support spring, and when the movable contact (7) is in contact with the stationary contact (9), the support spring is compressed; the hook mechanism further comprises a connecting plate (2) sleeved on the outer periphery of the fixed column (1), and one end of the connecting rod (3) is hinged to the connecting plate (2); the center of the contact plate (5) has a second through hole penetrating in the thickness direction, and the movable contact (7) passes through the first through hole and the second through hole; the fixed column (1) is provided with a second through hole extending through the center of the contact plate (5) in the thickness direction, and the movable contact (7) passes through the first through hole and the second through hole; The fixed column (1) is tubular, the rear end of the movable contact (7) extends to the inner side of the fixed column (1), the side wall of the fixed column (1) is provided with a limiting hole (11) parallel to the axial direction, and the rear end of the movable contact (7) is provided with a limiting protrusion that cooperates with the limiting hole (11); the rear part of the fixed column (1) is sleeved with a locking spring (8), and the locking spring (8) is against the connecting plate (2); the fixed column (1) is provided with a limiting portion for axially limiting the connecting plate (2).

2. A voltage transformer, characterized in that: It includes the claw-type moving contact as described in claim 1.

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