A plug-in circuit breaker contact seat and assembly method thereof

Abstract

The present invention relates to a plug-in circuit breaker contact seat and an assembly method thereof, comprising an arc extinguishing chamber assembly and an operating mechanism, wherein a moving contact conductive plate is fixedly connected to the upper end surface of one end of the arc extinguishing chamber assembly, a static contact conductive plate is fixedly connected to the other end of the arc extinguishing chamber assembly, a moving contact conductor and a static contact conductor are fixedly connected to a circuit breaker housing, the static contact conductive plate is fixedly connected to the static contact conductor by bolts, a horizontal plug-in contact is fixedly connected to the lower end of the moving contact conductor, and the moving contact conductive plate is laterally slidably connected to the horizontal plug-in contact; a moving end mounting opening for accommodating the arc extinguishing chamber assembly to pass laterally is opened at one end of the circuit breaker housing, a moving end sealing plate is bolted to the outer side of the moving end mounting opening, the arc extinguishing chamber assembly is fixedly connected to the moving end sealing plate by an insulating platform, and the moving contact conductive plate of the present invention adopts a horizontal plug-in assembly structure, during the assembly operation, the arc extinguishing chamber is horizontally sent into the housing as a whole, and only one side of the contact needs to be tightened with bolts, and the other side is clamped and assembled by the horizontal plug-in contact.

Description

Technical Field

[0001] The invention relates to the field of circuit breakers, in particular to the field of circuit breaker assembly, and specifically refers to a plug-in circuit breaker contact seat and an assembly method thereof. Background Art

[0002] With the rapid development of my country's economy, the demand for power and power transmission and transformation equipment is also increasing sharply, and the application of GIS (gas-insulated metal-enclosed switchgear) equipment is becoming more and more extensive. 550kV circuit breakers are often used in long-distance and cross-regional transmission lines. The circuit breaker unit plays an extremely important role in GIS, which mainly plays the role of breaking and closing the current. Since the rated current in the working circuit is as high as several thousand amperes, an extremely high-temperature arc will be generated during the current breaking process. The high-temperature arc may burn the internal parts of the arc extinguishing chamber, causing the entire circuit breaker unit to fail, and then cause a large-scale power outage, seriously affecting my country's economic development and people's normal life; in addition, the arc extinguishing chamber assembly unit is the core of the circuit breaker, and its size is large, which is not easy to disassemble and assemble, affecting production efficiency. Therefore, designing a simple and reliable connection structure is extremely important for improving production efficiency and facilitating later inspection and maintenance.

[0003] At present, the arc extinguishing chamber inside the circuit breaker is fixed on the shell through an insulating platform, and the inlet and outlet of the circuit breaker use a vertical plug-in connection structure, which is connected by bolts. When disassembling, the connection bolts must be removed first, and then the entire arc extinguishing chamber is moved downward to separate the connecting conductor from the contact seat, and then the entire arc extinguishing chamber is pulled out using a tool. The assembly process is opposite to the above process. The above structure is difficult to position and inefficient during assembly, and is not convenient for later inspection and maintenance. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a plug-in circuit breaker contact seat and an assembling method thereof.

[0005] The present invention is realized by the following technical scheme, which provides a plug-in circuit breaker contact seat, including a horizontal arc extinguishing chamber assembly located in the circuit breaker housing and an operating mechanism located outside the circuit breaker housing, wherein the arc extinguishing chamber assembly is provided with a moving contact and a stationary contact, the upper end surface of one end of the arc extinguishing chamber assembly is fixedly connected to a moving contact conductive plate electrically connected to the internal moving contact, and the other end of the arc extinguishing chamber assembly is fixedly connected to a stationary contact conductive plate electrically connected to the internal stationary contact, the circuit breaker housing is fixedly connected with a moving contact conductor and a stationary contact conductor, and the stationary contact conductive plate is connected to the circuit breaker housing by bolts. The static contact conductor is fixed, and a horizontal plug-in contact is fixed to the lower end of the moving contact conductor, and the moving contact conductive plate is laterally slidably connected with the horizontal plug-in contact; the end of the circuit breaker housing close to the moving contact conductive plate is provided with a moving end mounting opening for accommodating the arc extinguishing chamber assembly to pass horizontally, and the outer side of the moving end mounting opening is bolted with a moving end sealing plate, the arc extinguishing chamber assembly is fixed to the moving end sealing plate through an insulating platform, the operating mechanism is fixed to the outer side of the moving end sealing plate, and the end of the circuit breaker housing close to the static contact conductive plate is provided with a static end mounting opening, and the outer side of the static end mounting opening is bolted with a static end sealing plate.

[0006] The movable contact conductive plate in the present solution is laterally slidably connected with the horizontal plug-in contact. During the assembly operation, the arc extinguishing chamber assembly is sent horizontally into the housing as a whole. Only one side of the contact needs to be tightened with bolts, and the other side is clamped and assembled with the horizontal plug-in contact.

[0007] As an optimization, the horizontal plug-in contact includes a contact seat fixedly connected to the lower end of the moving contact conductor, a contact finger cavity is opened in the contact seat, two rows of symmetrically arranged contact fingers are installed in the contact finger cavity, and spring sheets are installed on the opposite sides of the two rows of contact fingers. The lower end of the moving contact conductor is fixedly connected to a conductor plug plate inserted between the upper ends of the two rows of contact fingers, and the moving contact conductive plate is horizontally inserted into the lower end between the two rows of contact fingers. The contact seat is provided with an avoidance groove for avoiding the moving contact conductive plate. In this solution, a chamber that can be adjusted according to the size of the clamping force is formed between the left and right rows of contact fingers. When the moving contact conductive plate is horizontally inserted into the chamber, the left and right rows of contact fingers will hold the moving contact conductive plate tightly under the action of the spring sheet clamping force to achieve horizontal plug-in assembly.

[0008] As an optimization, a limit block located between two rows of contact fingers is fixedly connected in the contact finger cavity. The limit block in this solution limits the initial distance between the two rows of contact fingers, making it easier for the moving contact conductive plate to be inserted.

[0009] As an optimization, a threaded hole is opened on the side of the conductor plug plate, and a bolt fastened to the threaded hole is installed on the side of the contact seat. In this solution, the contact seat is connected to the conductor plug plate by bolts, so that disassembly and assembly are realized.

[0010] As an optimization, the contact seat includes two symmetrically arranged half seats, the two half seats are fixedly connected by positioning bolts, the two half seats are arranged along the insertion direction of the movable contact conductive plate, and a contact finger cavity is formed between the two half seats, and two rows of contact fingers are respectively located on both sides of the positioning bolts. In this solution, the contact seat includes two symmetrically arranged half seats, thereby facilitating the installation of the contact fingers.

[0011] As an optimization, the front end of the movable contact conductive plate along the transverse insertion direction is chamfered. The chamfer provided in this solution facilitates the insertion of the movable contact conductive plate.

[0012] As an optimization, the circuit breaker housing is provided with a moving end auxiliary port located below the moving contact conductive plate and a static end auxiliary port located below the static contact conductive plate, the moving end auxiliary port is bolted with a moving end auxiliary sealing plate, and the static end auxiliary port is bolted with a static end auxiliary sealing plate. The static end auxiliary port and the moving end auxiliary port provided in this solution facilitate the assembly of the arc extinguishing chamber during the installation process of supporting from below.

[0013] A method for assembling a plug-in circuit breaker contact seat comprises the following steps:

[0014] a. Fix the arc extinguishing chamber assembly to one side of the moving end sealing plate through the insulating platform, fix the operating mechanism to the outside of the moving end sealing plate, and install the horizontal plug-in contact at the lower end of the moving contact conductor;

[0015] b. Pass the horizontal auxiliary rod through the moving end installation opening and the static end installation opening, and connect one end of the auxiliary rod to the static contact conductive plate with bolts;

[0016] c. Use the hoisting operating mechanism and the auxiliary rod to drive the arc extinguishing chamber assembly to move horizontally, so that the arc extinguishing chamber assembly passes horizontally through the moving end installation opening and is inserted into the circuit breaker housing;

[0017] d. When inserting, insert the moving contact conductive plate horizontally into the lower end between the two rows of contact fingers to achieve electrical connection between the moving contact conductive plate and the moving contact conductor;

[0018] e. Connect the moving end cover plate bolts to the outside of the moving end installation port, remove the auxiliary rod from the static end installation port, and fix the static contact conductive plate to the static contact conductor with bolts, and finally install the static end cover plate.

[0019] The beneficial effects of the present invention are as follows: a plug-in circuit breaker contact seat and an assembly method thereof of the present invention, a movable contact conductive plate adopts a horizontal plug-in assembly structure, during the assembly operation, the arc extinguishing chamber is horizontally sent into the shell as a whole, and only one side of the contact needs to be fastened with bolts, and the other side is assembled by clamping the horizontal plug-in contact. When the circuit breaker is inspected and maintained, only one side needs to be disassembled, and then the arc extinguishing chamber can be pulled out as a whole using tooling. The invention has a simple structure, is easy to use, safe and reliable, can greatly improve assembly efficiency, and shorten the inspection and maintenance cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an internal cross-sectional view of the present invention;

[0021] Figure 2 This is a schematic diagram of the installation of the horizontal plug-in contact of the present invention;

[0022] Figure 3 For the present invention Figure 2 A partial enlarged view of

[0023] Figure 4 It is a cross-sectional schematic diagram of a horizontal plug-in contact of the present invention;

[0024] Figure 5 For the present invention Figure 4 Sectional view of the middle AA plane;

[0025] Figure 6 For the present invention Figure 5 A schematic diagram not including the contact finger piece and the spring piece;

[0026] Figure 7 For the present invention Figure 5 A schematic diagram of a movable contact conductive plate and a conductor plug plate is included;

[0027] Figure 8 For the present invention Figure 4 A top view of

[0028] Fig. 9 It is a schematic cross-sectional view of the conductor of the moving contact of the present invention;

[0029] Fig.10 For the present invention Fig. 9 Bottom view of

[0030] Fig.11 It is a schematic diagram of the installation process of the present invention;

[0031] As shown in the figure:

[0032] 1. Insulating platform, 2. Moving contact insulator, 3. Moving contact conductor, 31. Conductor plug-in plate, 4. Moving contact conductive plate, 5. Horizontal plug-in contact, 51. Half seat, 52. Contact finger, 53. Positioning bolt, 54. Spring sheet, 55. Avoidance groove, 56. Limit block, 6. Circuit breaker housing, 7. Arc extinguishing chamber assembly, 8. Static contact conductive plate, 9. Static contact conductor, 10. Static contact insulator, 11. Operating mechanism, 12. Moving end sealing plate, 13. Static end sealing plate, 14. Moving end auxiliary sealing plate, 15. Static end auxiliary sealing plate. DETAILED DESCRIPTION

[0033] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0034] like Figures 1 to 11 As shown, a plug-in circuit breaker contact seat of the present invention includes a horizontal arc extinguishing chamber assembly 7 located in the circuit breaker housing 6 and an operating mechanism 11 located outside the circuit breaker housing 6. The arc extinguishing chamber assembly 7 is equipped with a moving contact and a stationary contact. The moving contact is driven by the operating mechanism 11 to slide horizontally to achieve connection and separation with the stationary contact, thereby realizing the connection and disconnection of the circuit breaker.

[0035] The circuit breaker housing 6 is fixedly connected with a moving contact conductor 3 and a stationary contact conductor 9. The moving contact conductor 3 and the stationary contact conductor 9 are both located inside the circuit breaker housing 6. The moving contact conductor 3 is insulated and connected to the circuit breaker housing 6 through the moving contact insulator 2. The stationary contact conductor 9 is insulated and connected to the circuit breaker housing 6 through the stationary contact insulator 10. The moving contact conductor 3 and the stationary contact conductor 9 are both located above the arc extinguishing chamber assembly 7. The moving contact conductor 3 and the stationary contact conductor 9 are connected to the incoming and outgoing cables respectively.

[0036] A moving contact conductive plate 4 electrically connected to the internal moving contact is fixedly connected to the upper end surface of one end of the arc extinguishing chamber assembly 7, a horizontal plug-in contact 5 is fixedly connected to the lower end of the moving contact conductor 3, and the moving contact conductive plate 4 is in sliding contact with the horizontal plug-in contact 5 laterally.

[0037] A moving end mounting opening for accommodating the arc extinguishing chamber assembly 7 to pass horizontally is formed at one end of the circuit breaker housing 6 close to the moving contact conductive plate 4. A moving end sealing plate 12 is bolted to the outer side of the moving end mounting opening. The moving end sealing plate 12 is flange-connected to the circuit breaker housing 6. The arc extinguishing chamber assembly 7 is fixedly connected to the moving end sealing plate 12 through the insulating platform 1. The operating mechanism 11 is fixedly connected to the outer side of the moving end sealing plate 12, so that the moving contact in the arc extinguishing chamber assembly 7 is driven by the operating mechanism 11 to slide horizontally to achieve connection and separation with the static contact.

[0038] The other end of the arc extinguishing chamber assembly 7 is fixedly connected to a static contact conductive plate 8 electrically connected to the internal static contact. The static contact conductive plate 8 is fixedly connected to the static contact conductor 9 by bolts. A static end mounting opening is opened at one end of the circuit breaker housing 6 close to the static contact conductive plate 8. A static end sealing plate 13 is bolted to the outer side of the static end mounting opening. The static contact conductive plate 8 can be disassembled and assembled by removing the static end sealing plate 13.

[0039] The circuit breaker housing 6 is provided with a moving end auxiliary opening located below the moving contact conductive plate 4 and a static end auxiliary opening located below the static contact conductive plate 8. The moving end auxiliary opening is bolted with a moving end auxiliary sealing plate 14, and the static end auxiliary opening is bolted with a static end auxiliary sealing plate 15. The static end auxiliary opening and the moving end auxiliary opening are provided for the convenience of supporting the arc extinguishing chamber assembly 7 from below during the installation process. During the process of the arc extinguishing chamber assembly 7 being horizontally inserted into the circuit breaker housing 6, the arc extinguishing chamber assembly 7 is auxiliary supported by passing through the static end auxiliary opening and the moving end auxiliary opening by hand or tools.

[0040] like Figures 3 to 10As shown, the horizontal plug-in contact 5 includes a contact seat fixedly connected to the lower end of the moving contact conductor 3, and a contact finger cavity is opened in the contact seat. Two rows of symmetrically arranged contact fingers 52 are installed in the contact finger cavity, and at least 10 contact fingers 52 are arranged side by side in each row of contact fingers 52.

[0041] The two rows of contact fingers 52 are both provided with spring sheets 54 on the opposite sides thereof. Each contact finger 52 is provided with a spring sheet 54 , and the contact fingers 52 provided with spring sheets 54 are symmetrically placed into the contact finger cavity in sequence.

[0042] A limiting block 56 located between two rows of contact fingers 52 is fixedly connected in the contact finger cavity. In the initial state, the two rows of contact fingers 52 are pressed against the limiting block 56 to prevent the contact fingers 52 from moving.

[0043] The contact seat includes two symmetrically arranged half seats 51, and the two half seats 51 are fixedly connected by positioning bolts 53. The two half seats 51 are arranged along the insertion direction of the moving contact conductive plate 4. A contact finger cavity is formed between the two half seats 51. Two rows of contact finger pieces 52 are respectively located on both sides of the positioning bolts 53. A protrusion is set in the center of the two half seats 51, and the two protrusions form a limit block 56 relative to each other. The positioning bolts 53 pass through the two protrusions to realize the splicing of the two half seats 51 into a contact seat.

[0044] The lower end of the moving contact conductor 3 is fixedly connected with a conductor plug plate 31 inserted between the upper ends of the two rows of contact fingers 52, and the moving contact conductive plate 4 is horizontally inserted into the lower ends between the two rows of contact fingers 52, thereby realizing the electrical connection between the moving contact conductive plate 4 and the moving contact conductor 3.

[0045] The contact seat 51 is provided with an escape groove 55 for escaping the movable contact conductive plate 4. Figure 5 , 6 As shown, a avoidance groove 55 is formed in the middle of the lower end of each half seat 51 .

[0046] The side surface of the conductor plug plate 31 is provided with a threaded hole, and the side surface of the contact seat is provided with a bolt fastened into the threaded hole, thereby achieving the fixed connection between the contact seat and the conductor plug plate 31 .

[0047] The front end of the movable contact conductive plate 4 along the transverse insertion direction is chamfered to facilitate the insertion of the movable contact conductive plate 4 between the two rows of contact fingers 52 .

[0048] A method for assembling a plug-in circuit breaker contact seat comprises the following steps:

[0049] a. Fix the arc extinguishing chamber assembly 7 to one side of the moving end sealing plate 12 through the insulating platform 1, fix the operating mechanism 11 to the outside of the moving end sealing plate 12, and install the horizontal plug-in contact 5 at the lower end of the moving contact conductor 3;

[0050] b. Fig.11As shown, the transverse auxiliary rod is passed through the movable end mounting opening and the static end mounting opening, and one end of the auxiliary rod is connected to the static contact conductive plate 8 by bolts;

[0051] c. Fig.11 As shown, the arc extinguishing chamber assembly 7 is driven to move horizontally by the hoisting operating mechanism 11 and the auxiliary rod. Fig.11 The vertical ones at the left and right ends are hoisting ropes, and the horizontal ones in the circuit breaker housing 6 are auxiliary rods, so that the arc extinguishing chamber assembly 7 is inserted into the circuit breaker housing 6 after passing through the movable end installation opening horizontally;

[0052] d. When inserting, the movable contact conductive plate 4 is inserted horizontally into the lower end between the two rows of contact fingers 52 to achieve electrical connection between the movable contact conductive plate 4 and the movable contact conductor 3;

[0053] e. Bolt the moving end sealing plate 12 to the outside of the moving end installation opening, remove the auxiliary rod from the static end installation opening, and fix the static contact conductive plate 8 to the static contact conductor 9 by bolts, and finally install the static end sealing plate 13.

[0054] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A plug-in circuit breaker contact seat, comprising a transverse arc extinguishing chamber assembly (7) located in a circuit breaker housing (6) and an operating mechanism (11) located outside the circuit breaker housing (6), wherein the arc extinguishing chamber assembly (7) has a moving contact and a stationary contact installed therein, characterized in that: A movable contact conductive plate (4) electrically connected to an internal movable contact is fixedly connected to the upper end surface of one end of the arc extinguishing chamber assembly (7), a stationary contact conductive plate (8) electrically connected to an internal stationary contact is fixedly connected to the other end of the arc extinguishing chamber assembly (7), a movable contact conductor (3) and a stationary contact conductor (9) are fixedly connected to the circuit breaker housing (6), the stationary contact conductive plate (8) is fixedly connected to the stationary contact conductor (9) by bolts, a horizontal plug-in contact (5) is fixedly connected to the lower end of the movable contact conductor (3), and the movable contact conductive plate (4) is laterally slidably connected to the horizontal plug-in contact (5); The circuit breaker housing (6) has a movable end mounting opening at one end close to the movable contact conductive plate (4) for allowing the arc extinguishing chamber assembly (7) to pass horizontally, a movable end sealing plate (12) is bolted to the outer side of the movable end mounting opening, the arc extinguishing chamber assembly (7) is fixedly connected to the movable end sealing plate (12) through the insulating platform (1), the operating mechanism (11) is fixedly connected to the outer side of the movable end sealing plate (12), and the circuit breaker housing (6) has a static end mounting opening at one end close to the static contact conductive plate (8), and a static end sealing plate (13) is bolted to the outer side of the static end mounting opening; The horizontal plug-in contact (5) comprises a contact seat fixedly connected to the lower end of the moving contact conductor (3), a contact finger cavity being opened in the contact seat, two rows of symmetrically arranged contact fingers (52) being installed in the contact finger cavity, and spring plates (54) being installed on opposite sides of the two rows of contact fingers (52), a conductor plug plate (31) being fixedly connected to the lower end of the moving contact conductor (3) and inserted between the upper ends of the two rows of contact fingers (52), the moving contact conductive plate (4) being laterally inserted into the lower ends between the two rows of contact fingers (52), and a avoidance groove (55) for avoiding the moving contact conductive plate (4) being opened on the contact seat; The contact seat comprises two symmetrically arranged half seats (51), the two half seats (51) being fixedly connected by a positioning bolt (53), the two half seats (51) being arranged along the insertion direction of the movable contact conductive plate (4), a contact finger piece cavity being formed between the two half seats (51), and two rows of contact finger pieces (52) being respectively located on both sides of the positioning bolt (53).

2. A plug-in circuit breaker contact seat according to claim 1, characterized in that: A limiting block (56) located between two rows of contact finger pieces (52) is fixedly connected in the contact finger piece cavity.

3. The plug-in circuit breaker contact seat according to claim 1, characterized in that: A threaded hole is provided on the side of the conductor plug plate (31), and a bolt fastened to the threaded hole is installed on the side of the contact seat.

4. The plug-in circuit breaker contact seat according to claim 1, characterized in that: The front end of the movable contact conductive plate (4) along the transverse insertion direction is chamfered.

5. A plug-in circuit breaker contact seat according to any one of claims 1 to 4, characterized in that: The circuit breaker housing (6) is provided with a moving end auxiliary opening located below the moving contact conductive plate (4) and a static end auxiliary opening located below the static contact conductive plate (8); the moving end auxiliary opening is bolted to a moving end auxiliary sealing plate (14), and the static end auxiliary opening is bolted to a static end auxiliary sealing plate (15).

6. An assembly method for the plug-in circuit breaker contact seat according to claim 5, characterized in that: The steps include: a. The arc extinguishing chamber assembly (7) is fixedly connected to one side of the moving end cover plate (12) through the insulating platform (1), the operating mechanism (11) is fixedly connected to the outer side of the moving end cover plate (12), and the horizontal plug-in contact (5) is installed at the lower end of the moving contact conductor (3); b. Pass the horizontal auxiliary rod through the movable end mounting opening and the static end mounting opening, and connect one end of the auxiliary rod to the static contact conductive plate (8) by means of bolts; c. The arc extinguishing chamber assembly (7) is driven to move horizontally by means of the lifting operating mechanism (11) and the auxiliary rod, so that the arc extinguishing chamber assembly (7) is inserted into the circuit breaker housing (6) after passing horizontally through the movable end installation opening; d. When inserting, the movable contact conductive plate (4) is inserted transversely into the lower end between the two rows of contact fingers (52) to achieve electrical connection between the movable contact conductive plate (4) and the movable contact conductor (3); e. Bolt the moving end sealing plate (12) to the outside of the moving end mounting opening, remove the auxiliary rod from the static end mounting opening, and fix the static contact conductive plate (8) to the static contact conductor (9) with bolts, and finally install the static end sealing plate (13).

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