A quick earthing switch

Abstract

A quick earthing switch includes an operating mechanism, a static contact, and a guiding component. A moving contact component is installed between the guiding component and the static contact. The operating mechanism drives the moving contact component to cooperate with the static contact under the action of the guiding component. The moving contact component includes a moving contact, an insulating plate, and a driving member. The moving contact is fixed to one side of the insulating plate close to the static contact. The side of the insulating plate away from the static contact is connected to the fixing member of the guiding component. The fixing member is connected to the driving member. The operating mechanism drives the fixing member through the driving member to make the insulating plate move linearly and drive the moving contact to cooperate with the static contact. In the quick earthing switch of the present invention, the moving contact is fixed on the insulating plate. The operating mechanism drives the insulating plate to move linearly through the driving member and drives the moving contact to move at the same time, ensuring the consistency of the movement of the moving contact.

Description

Technical Field

[0001] The present invention relates to the field of high-voltage electrical equipment, and particularly to a fast earthing switch. Background Art

[0002] At present, with the rapid development of power construction, the power grid is constantly expanding and its capacity is also increasing continuously. High-voltage power grid lines are often applied over long distances and with multiple circuits on the same tower. This requires the fast earthing switch to have the ability to break more than the Class B earthing switch in Appendix C of IEC62271-102. However, the existing earthing switches generally have the same structure, and all are driven by means of a crank arm arranged in a housing. The arc movement of the crank arm causes the moving contact to have jumps and jitters during the movement process, affecting the centering degree of the cooperation between the moving and static contacts. This structure has the disadvantages of complex structure, a large variety and quantity of parts, poor consistency of contacts, insufficient reliability of the drive structure, and inability to meet the requirements of exceeding Class B. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a fast earthing switch with a simple structure and high reliability.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A fast earthing switch includes an operating mechanism, a static contact, and a guiding component. A moving contact assembly is installed between the guiding component and the static contact, and the operating mechanism drives the moving contact assembly to cooperate with the static contact under the action of the guiding component; the moving contact assembly includes a plurality of moving contacts, an insulating plate, and a driving member. The plurality of moving contacts are fixed to one side of the insulating plate close to the static contact, the side of the insulating plate away from the static contact is connected to the fixing member of the guiding component, the fixing member is connected to the driving member, and the operating mechanism drives the fixing member through the driving member to make the insulating plate move linearly and drive the moving contact to cooperate with the static contact.

[0006] Further, the guiding component includes a fixing member, a guiding rod, and a bottom plate. Grooves for the guiding rod to pass through are provided at both ends of the fixing member. The guiding rod is vertically installed on the bottom plate, and a connection hole is provided in the center of the bottom plate. The driving member passes through the connection hole and is connected to the operating mechanism. The fixing member moves linearly along the guiding rod under the action of the driving member, and the insulating plate moves linearly together with the fixing member.

[0007] Further, the driving member includes a sealing component, a sealing rod, and a transmission joint. The sealing component is provided with a through hole penetrating both ends. Both ends of the sealing component are respectively connected to the operating mechanism and the bottom plate. The sealing rod is disposed through the through hole and can move linearly along the axis of the through hole. One end of the sealing rod is connected to the fixing member, and the other end of the sealing rod is connected to the operating mechanism through the transmission joint.

[0008] Further, the groove is an open-ended groove at both ends, and a guide sleeve is arranged in the groove; the sealing assembly is composed of a plurality of seals, and the transmission joint is a transmission joint with an adjustable length.

[0009] Further, it further includes a housing; the housing and the operating mechanism are respectively fixed on both sides of the bottom plate of the guiding assembly. The operating mechanism is connected to one side of the bottom plate through a support frame, and the housing is hermetically fixed to the other side of the bottom plate, and the moving contact assembly and the static contact are both sealed in the housing.

[0010] Further, the moving contact is a three-phase moving contact, and the static contact is a three-phase static contact. Three protrusions protrude outward on the side of the insulating plate close to the static contact, making the overall insulating plate in a "mountain" shape, and each phase of the three-phase moving contact is correspondingly installed on one protrusion.

[0011] Further, the moving contact assembly further includes a shielding ring for shielding the electric field, and the shielding ring is fixedly installed between the moving contact and the static contact; when closing, the moving contact passes through the shielding ring and cooperates with the static contact; when opening, the moving contact and the static contact are disengaged, and the end of the moving contact corresponds to the shielding ring.

[0012] Further, it further includes a grounding lead-out terminal. The connecting end of the grounding lead-out terminal is connected to the moving contact through a flexible connector. The grounding end of the grounding lead-out terminal is provided with a short-circuit current-carrying bar, and the short-circuit current-carrying bar is connected to the grounding copper bar to achieve grounding.

[0013] Further, a perforation is provided on the bottom plate. One end of the grounding lead-out terminal is fixedly installed on the bottom plate as the grounding end, and the other end of the grounding lead-out terminal passes through the perforation as the connecting end. The connecting end is provided with a mounting plate; the flexible connector is in a U shape, one end of the flexible connector is connected to the moving contact, and the other end is connected to the grounding lead-out terminal through the mounting plate.

[0014] Further, the mounting plate includes a pressing plate and a transition mounting plate. One end of the flexible connector is fixed between the pressing plate and the transition mounting plate; a shielding ring is installed on the pressing plate, and the shielding ring is installed in a cantilever manner at the end of the pressing plate. The central axis of the shielding ring coincides with the central axis of the moving contact, and the shielding ring corresponds to the end of the moving contact during opening.

[0015] A fast earthing switch of the present invention adopts a completely new structure compared with the existing earthing switch. A plurality of moving contacts are fixed on the same insulating plate. The operating mechanism drives the insulating plate to move linearly through a driving member and at the same time drives the moving contacts to move, ensuring the consistency of the movement of the plurality of moving contacts. Compared with the existing operation method of operating the moving contacts through toggle arms and three-phase connecting plates respectively, it is relatively simple; at the same time, with the cooperation of the driving member, the guiding assembly and the insulating plate, the linear movement of the moving contact will not cause jitter or vibration due to the rotation of the operating mechanism, and will not affect the alignment degree of the cooperation between the moving contact and the static contact.

[0016] In addition, an insulating plate in a "mountain" shape is adopted, which shortens the movement stroke of the moving contact and is beneficial to improving the opening and closing speed. The operating mechanism and the housing are respectively fixed on both sides of the bottom plate. The housing forms a sealed gas chamber on one side of the bottom plate, and all components are directly or indirectly installed on the bottom plate, reducing the installation difficulty of the components. The shielding ring is installed on the grounding lead-out terminal in a cantilever mounting manner, reducing the number and types of components and making the installation method and installation position more flexible. A flexible connecting piece is used between the grounding lead-out terminal and the moving contact, and the flexible connecting piece is in a U shape to ensure that one end of the flexible connecting piece can move together with the moving contact. The transmission joint is a transmission joint with an adjustable length, which is beneficial to adjusting the starting position of the moving contact. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of a fast earthing switch of the present invention;

[0018] Figure 2 is a schematic internal structure diagram of a fast earthing switch of the present invention;

[0019] Figure 3 is Figure 2 the A-A cross-sectional view of Detailed Embodiments

[0020] The following Figures 1 to 3 given embodiments are used to further illustrate the detailed embodiments of a fast earthing switch of the present invention. The fast earthing switch of the present invention is not limited to the descriptions of the following embodiments.

[0021] A fast earthing switch includes an operating mechanism 1, a static contact 2 and a guiding assembly. A moving contact assembly is installed between the guiding assembly and the static contact 2. The operating mechanism 1 drives the moving contact assembly to cooperate with the static contact 2 under the action of the guiding assembly. The moving contact assembly includes a plurality of moving contacts 31, an insulating plate 32 and a driving member. The plurality of moving contacts 31 are fixed on one side of the insulating plate 32 close to the static contact 2. One side of the insulating plate 32 far from the static contact 2 is connected to a fixing member 41 of the guiding assembly, and the fixing member 41 is connected to the driving member. The operating mechanism 1 drives the fixing member 41 through the driving member to make the insulating plate 32 move linearly and drive the moving contact 31 to cooperate with the static contact 2.

[0022] A quick earthing switch of the present invention adopts a brand-new structure compared with the existing earthing switch. A plurality of moving contacts 31 are fixed on an insulating plate 32. The operating mechanism 1 drives a fixing member 41 through a driving member to make the insulating plate 32 move linearly, while driving the moving contacts 31 to move, ensuring the consistency of the movement of the moving contacts 31. Compared with the existing operation mode of operating the moving contacts 31 respectively through crank arms and three-phase connecting plates, it is relatively simple; at the same time, with the cooperation of the driving member, the guiding component and the insulating plate 32, the linear movement of the moving contacts 31 will not generate jitter or vibration due to the rotation of the operating mechanism 1, and will not affect the centering degree of the cooperation between the moving contacts 31 and the static contacts 2.

[0023] As Figures 1 - 3 shown, an embodiment of a miniaturized quick earthing switch includes an operating mechanism 1, static contacts 2, a guiding component and an earthing lead terminal 5. A moving contact assembly is installed between the guiding component and the static contacts 2. The operating mechanism 1 drives the moving contact assembly to cooperate with the static contacts 2 under the action of the guiding component; the moving contact assembly includes a plurality of moving contacts 31, an insulating plate 32 and a driving member. The plurality of moving contacts 31 are fixed on one side of the insulating plate 32 close to the static contacts 2. The side of the insulating plate 32 far from the static contacts 2 is connected to the fixing member 41 of the guiding component, and the fixing member 41 is connected to the driving member. The operating mechanism 1 drives the fixing member 41 through the driving member to make the insulating plate 32 move linearly and drive the moving contacts 31 to cooperate with the static contacts 2. Preferably, the moving contact assembly further includes a shielding ring 36 for shielding the electric field. The shielding ring 36 is fixedly installed between the moving contacts 31 and the static contacts 2; when closing, the moving contacts 31 pass through the shielding ring 36 to cooperate with the static contacts 2; when opening, the moving contacts 31 are disengaged from the static contacts 2, and the end of the moving contacts 31 corresponds to the shielding ring 36.

[0024] Specifically as Figure 2 、 3 shown, the guiding component includes a fixing member 41, a guiding rod 42 and a bottom plate 43. Both ends of the fixing member 41 are provided with grooves (not shown in the figure) for the guiding rod 42 to pass through. Preferably, the grooves on the fixing member 41 are open at both ends. A guiding sleeve is arranged in the grooves, and the guiding sleeve can swing freely appropriately in the open grooves at both ends. The guiding rod 42 is vertically installed on the bottom plate 43. A connecting hole is provided in the center of the bottom plate 43. The driving member passes through the connecting hole and is connected to the operating mechanism 1. The fixing member 41 moves linearly along the guiding rod 42 under the action of the driving member, and the insulating plate 32 moves linearly together with the fixing member 41.

[0025] The driving member includes a sealing assembly 33, a sealing rod 34, and a transmission joint 35. The sealing assembly 33 is provided with a through hole penetrating both ends. The two ends of the sealing assembly 33 are respectively connected to the operating mechanism 1 and the bottom plate 43. The sealing rod 34 is disposed through the through hole and can move linearly along the axis of the through hole. One end of the sealing rod 34 is connected to the fixing member 41, and the other end of the sealing rod 34 is connected to the operating mechanism 1 through the transmission joint 35. One way of the operating mechanism 1 is that the operating mechanism 1 can rotate clockwise and counterclockwise at a certain angle. An arm is installed at the end of the rotating shaft of the operating mechanism 1. The arm is connected to the transmission joint 35, and the transmission joint 35 drives the sealing rod 34 to perform linear reciprocating motion. As Figure 2 , 3 shown, when closing, the operating mechanism 1 rotates. The operating mechanism 1 makes the sealing rod 34 move upward through the transmission joint 35, and the moving contact 31 moves upward through the shielding ring 36. When opening, the operating mechanism 1 makes the sealing rod 34 move downward through the transmission joint 35, and the moving contact 31 separates from the static contact 2. The end of the shielding ring 36 corresponding to the moving contact 31 conducts electric field shielding. Preferably, an alloy area is provided at the end of the moving contact 31, and the alloy area realizes the function of arc ignition during the movement process; the sealing assembly 33 is composed of multiple sealing members, so that when the sealing rod 34 moves linearly in the sealing assembly 33, it can ensure that the insulating gas in the sealed gas chamber (not shown in the figure) does not leak; the transmission joint 35 is preferably a transmission joint 35 with an adjustable length, which is beneficial to adjusting the starting position of the moving contact 31.

[0026] As Figures 1 - 3 shown, the connection end of the grounding lead-out terminal 5 is connected to the moving contact 31 through a flexible connector 6. The grounding end of the grounding lead-out terminal 5 is provided with a short-circuit current-carrying bar 53, and the short-circuit current-carrying bar 53 is connected to the grounding copper bar 7 to achieve grounding. Specifically, a through hole is provided on the bottom plate 43. One end of the grounding lead-out terminal 5 is fixedly installed on the bottom plate 43 as the grounding end, and the other end of the grounding lead-out terminal 5 passes through the through hole as the connection end. The connection end is provided with a mounting plate for connecting with the flexible connector 6. The mounting plate preferably includes a pressing plate 51 and a transition mounting plate 52, and one end of the flexible connector 6 is fixed between the pressing plate 51 and the transition mounting plate 52. The end of the pressing plate 51 can be used to fixedly install the shielding ring 36. The shielding ring 36 is installed in a cantilever mounting manner at the end of the pressing plate 51, so that the central axis of the shielding ring 36 coincides with the central axis of the moving contact 31. The shielding ring 36 corresponds to the end of the moving contact 31 in the opening state. Of course, the shielding ring 36 can also be fixed to the bottom plate 43 by means of a bracket or a support rod structure. The shielding ring 36 adopts a cantilever mounting different from the existing mounting method, making the mounting method and mounting position of the shielding ring 36 more flexible. In addition, the shielding ring 36 can also adopt a cylindrical spinning structure.

[0027] The flexible connecting piece 6 is preferably integrally U-shaped. One end of the flexible connecting piece 6 is connected to the moving contact 31, and the other end is connected to the grounding lead-out terminal 5 through a mounting plate. When the moving contact assembly moves linearly, the flexible connecting piece 6 connected to the moving contact 31 can move together with the moving contact 31.

[0028] As Figures 1 - 3 shown, as an optimal embodiment, the moving contact 31 is a three-phase moving contact 31, and the static contact 2 is a three-phase static contact 2. Three protrusions are formed on the side of the insulating plate 32 close to the static contact 2, making the insulating plate 32 integrally in a "mountain" shape. Each phase of the three-phase moving contact 31 is correspondingly installed on a protrusion. This protrusion structure can shorten the distance between the moving contact assembly and the static contact 2, which is beneficial to shortening the closing and opening strokes. The two sides of the insulating plate 32 are preferably flat. One side is used to connect to the fixing part 41, and the other side is used to connect to the flexible connecting piece 6 of the grounding lead-out terminal 5. This "mountain"-shaped insulating plate 32 reduces the movement stroke of the moving contact 31 while ensuring the consistency of the actions of multiple moving contacts 31, which is beneficial to improving the closing and opening speeds and also conducive to the miniaturized design of the entire structure. Of course, the insulating plate 32 can also be a "one"-shaped without protrusions, but the effect of shortening the cooperation stroke between the moving contact assembly and the static contact 2 is not as good as that of the "mountain"-shaped insulating plate 32.

[0029] It further includes a cover (not shown in the figure); the cover and the operating mechanism 1 are respectively fixed on both sides of the bottom plate 43 of the guiding assembly. Preferably as Figure 2 shown, the operating mechanism 1 is connected to one side of the bottom plate 43 through a support frame 11 and is in waterproof and sealed cooperation with the guiding assembly; the cover is hermetically fixed to the other side of the bottom plate 43, forming a sealed gas chamber on the other side of the bottom plate 43, and the moving contact assembly and the static contact 2 are both sealed in the cover, and an insulating gas is filled in the sealed gas chamber. Compared with the traditional earthing switch, the earthing switch of this embodiment adopts a brand-new assembly structure, cancels the existing housing structure, directly or indirectly installs all the parts therein on the bottom plate 43, and then cooperates with the cantilever installation of the shielding ring 36, reducing the installation difficulty of the parts and simplifying the structure of the earthing switch, greatly reducing the volume of the earthing switch.

[0030] The miniaturized and fast earthing switch of this embodiment can be applied to sulfur hexafluoride metal-enclosed switchgear equipment, mainly set on the line side of the line interval and the main bus side of the switchyard. When it works for grounding, it can cut off static electricity and electromagnetic induction current, and can be used as the lead-out wiring terminal during the measurement of the main circuit resistance of GIS and the mechanical characteristic test of the circuit breaker.

[0031] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A quick earthing switch, comprising an operating mechanism (1), a static contact (2) and a guiding assembly, characterized in that: A moving contact assembly is installed between the guiding assembly and the static contact (2). The operating mechanism (1) drives the moving contact assembly to cooperate with the static contact (2) under the action of the guiding assembly. The moving contact assembly includes a plurality of moving contacts (31), an insulating plate (32) and a driving member. The plurality of moving contacts (31) are fixed to one side of the insulating plate (32) close to the static contact (2). One side of the insulating plate (32) away from the static contact (2) is connected to the fixing member (41) of the guiding assembly. The fixing member (41) is connected to the driving member. The guiding assembly includes a bottom plate (43). A connecting hole is provided in the center of the bottom plate (43). The driving member passes through the connecting hole and is connected to the operating mechanism (1). The operating mechanism (1) drives the fixing member (41) through the driving member to make the insulating plate (32) move linearly and drive the moving contact (31) to cooperate with the static contact (2). The grounding lead terminal (5) is fixedly installed on the bottom plate (43). An installation plate is provided at the connecting end of the grounding lead terminal (5). The installation plate includes a pressing plate (51). A shielding ring (36) is installed on the pressing plate (51). The shielding ring (36) is installed in a cantilevered manner at the end of the pressing plate (51). The shielding ring (36) is fixedly installed between the moving contact (31) and the static contact (2). The central axis of the shielding ring (36) coincides with the central axis of the moving contact (31). When closing, the moving contact (31) passes through the shielding ring (36) to cooperate with the static contact (2). It further includes a housing. The housing and the operating mechanism (1) are respectively fixed on both sides of the bottom plate (43) of the guiding assembly. The operating mechanism (1) is connected to one side of the bottom plate (43) through a support frame (11). The housing is hermetically fixed to the other side of the bottom plate (43), so that a sealed gas chamber is formed on the other side of the bottom plate (43). And the moving contact assembly and the static contact (2) are both sealed in the housing, and an insulating gas is filled in the sealed gas chamber.

2. The quick earthing switch according to claim 1, characterized in that: The guiding assembly further includes a fixing member (41) and a guiding rod (42). Grooves for the guiding rod (42) to pass through are provided at both ends of the fixing member (41). The guiding rod (42) is vertically installed on the bottom plate (43). The fixing member (41) moves linearly along the guiding rod (42) under the action of the driving member, and the insulating plate (32) moves linearly together with the fixing member (41).

3. The fast earthing switch according to claim 2, wherein: The driving member includes a sealing assembly (33), a sealing rod (34) and a transmission joint (35). The sealing assembly (33) is provided with a through hole penetrating both ends. Both ends of the sealing assembly (33) are respectively connected to the operating mechanism (1) and the bottom plate (43). The sealing rod (34) is arranged through the through hole and can move linearly along the axis of the through hole. One end of the sealing rod (34) is connected to the fixing member (41), and the other end of the sealing rod (34) is connected to the crank arm of the operating mechanism (1) through the transmission joint (35).

4. A quick earthing switch according to claim 3, characterized in that: The groove is an open groove at both ends. A guiding sleeve is arranged in the groove. The sealing assembly (33) is composed of a plurality of sealing members. The transmission joint (35) is a transmission joint (35) with adjustable length.

5. A quick earthing switch according to claim 1, characterized in that: On one side of the insulating plate (32) close to the static contact (2), three protrusions are formed to protrude outward, making the overall shape of the insulating plate (32) like a "mountain", and each phase of the moving contact (31) of the three-phase moving contact is correspondingly installed on one protrusion.

6. A quick earthing switch according to claim 1, characterized in that: The static contact (2) is a three-phase static contact (2).

7. A quick earthing switch according to claim 1, characterized in that: The shielding ring (36) is fixedly installed between the moving contact (31) and the static contact (2); when closing, the moving contact (31) passes through the shielding ring (36) and cooperates with the static contact (2); when opening, the moving contact (31) is disengaged from the static contact (2), and the end of the moving contact (31) corresponds to the shielding ring (36).

8. A quick earthing switch according to claim 1, characterized in that: The connection end of the grounding lead-out terminal (5) is connected to the moving contact (31) through a flexible connector (6). The grounding end of the grounding lead-out terminal (5) is provided with a short-circuit current-carrying bar (53), and the short-circuit current-carrying bar (53) is connected to the grounding copper bar (7) to achieve grounding.

9. A quick earthing switch according to claim 8, characterized in that: A perforation is provided on the bottom plate (43). One end of the grounding lead-out terminal (5) is fixedly installed on the bottom plate (43) of the guiding assembly as the grounding end, and the other end of the grounding lead-out terminal (5) passes through the perforation as the connection end; the flexible connector (6) is U-shaped. One end of the flexible connector (6) is connected to the moving contact (31), and the other end is connected to the grounding lead-out terminal (5) through a mounting plate.

10. A quick earthing switch according to claim 9, characterized in that: The mounting plate further includes a transition mounting plate (52), and one end of the flexible connector (6) is fixed between the pressing plate (51) and the transition mounting plate (52).

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