Vacuum circuit breaker opening and closing insulation operation crank arm structure without insulation pull rod

Abstract

The utility model discloses a vacuum circuit breaker opening and closing insulation operation crank arm structure without an insulation pull rod, which comprises a vacuum arc-extinguishing chamber, a movable contact rod, a crank arm, a circuit breaker main shaft, a limit pad and a rectangular spring, the lower end of the vacuum arc-extinguishing chamber extends out of the movable contact rod, the crank arm is clamped at the lower end of the movable contact rod, and the crank arm rotates along with the circuit breaker main shaft. The crank arm rotates to drive the movable feeler lever to move up and down to switch on and switch off the vacuum circuit breaker, the crank arm is provided with an opening for avoiding the movable feeler lever, the bottom of the movable feeler lever penetrating through the opening is provided with a limiting pad, the movable feeler lever above the opening is sleeved with a rectangular spring, and the limiting pad and the rectangular spring are matched to clamp the movable feeler lever at the opening of the crank arm. Through the above mode, the crank arm rotates to drive opening and closing, the operation structure is simplified, an insulation pull rod and a complex connecting rod structure are not needed, the installation is simple, the occupied space size is small, and the economic benefit is large.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum circuit breakers, in particular to a closing and opening insulating operating crank arm structure of a vacuum circuit breaker without an insulating pull rod. Background Art

[0002] Chinese Patent No. CN201921768482.X discloses a circuit breaker for an gas-insulated switchgear with a three-position disconnector, which adopts the combination between a circuit breaker main shaft, a push rod a, a push rod b and a moving rod of a vacuum interrupter, changes the transmission mode of the closing and opening force of the circuit breaker, and the moving rod of the vacuum interrupter is equivalent to an insulating pull rod.

[0003] Vacuum circuit breakers usually use an insulating pull rod to pull the moving contact of the vacuum interrupter to open 8-20 mm and have an over-travel of 2-4 mm to achieve the closing and opening of the circuit breaker. This structure needs to configure a four-link mechanism and a main shaft to achieve the specified motion trajectory. This structure has high requirements for tolerance fit and requires a series of components such as a main shaft, an arm pin retaining ring, an epoxy or nylon pull rod, and inserts. There are many components, complex process requirements, and a large proportion of space dimensions.

[0004] Based on the above defects and deficiencies, it is necessary to improve the existing technology and design a closing and opening insulating operating crank arm structure of a vacuum circuit breaker without an insulating pull rod. Content of the Utility Model

[0005] The main technical problem to be solved by the utility model is to provide a closing and opening insulating operating crank arm structure of a vacuum circuit breaker without an insulating pull rod. The crank arm rotates to drive the closing and opening, simplifies the operating structure, does not require an insulating pull rod and a complex link structure, is easy to install, occupies a small space dimension, and has great economic benefits.

[0006] To solve the above technical problem, a technical solution adopted by the utility model is: to provide a closing and opening insulating operating crank arm structure of a vacuum circuit breaker without an insulating pull rod. This closing and opening insulating operating crank arm structure of a vacuum circuit breaker without an insulating pull rod includes a vacuum interrupter, a moving contact rod, a crank arm, a circuit breaker main shaft, a limiting pad and a rectangular spring. The moving contact rod extends out from the lower end of the vacuum interrupter, and the lower end of the moving contact rod is clamped with the crank arm. The crank arm rotates with the circuit breaker main shaft, and the rotation of the crank arm drives the moving contact rod to move up and down to perform the closing and opening of the vacuum circuit breaker. An opening for avoiding the moving contact rod is arranged on the crank arm, a limiting pad is installed at the bottom of the moving contact rod passing through the opening, and a rectangular spring is sleeved on the moving contact rod above the opening. The limiting pad and the rectangular spring cooperate to clamp the moving contact rod at the opening of the crank arm.

[0007] Preferably, the top surface and the bottom surface of the crank arm face the rectangular spring and the limiting pad respectively, and guiding inclined surfaces are symmetrically arranged on both the top surface and the bottom surface.

[0008] Preferably, the toggle arm is made of metal and is designed with increased thickness and width.

[0009] Preferably, the toggle arm is insulated and connected to the main shaft of the circuit breaker through a toggle arm seat. The toggle arm seat is installed on the main shaft of the circuit breaker, and the toggle arm is installed on the toggle arm seat. The toggle arm seat is made of insulating material.

[0010] Preferably, an epoxy resin is directly cast on the main shaft of the circuit breaker to form the toggle arm seat.

[0011] Preferably, the main shaft of the circuit breaker is a metal round bar with a diameter > Φ30mm.

[0012] Preferably, a vacuum circuit breaker closing and opening insulating operation toggle arm structure without an insulating pull rod further includes a stud ejector rod. A stud ejector rod pointing to the moving contact rod is horizontally placed at the opening of the toggle arm, and the other end of the stud ejector rod is connected to the insulating cover where the vacuum interrupter is located.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] The toggle arm is made of metal, with high strength and high mechanical life. The toggle arm has a certain thickness and width, and the electric field can be designed to eliminate corona partial discharge. The rotation of the toggle arm drives closing and opening, simplifies the installation and operation structure of the circuit breaker, and realizes the economic benefits of the toggle arm structure without an insulating pull rod;

[0015] An epoxy resin is directly cast on the main shaft of the circuit breaker to form the toggle arm seat, which can achieve a structure with only relative ground insulation similar to that of an insulating pull rod, reduce the probability of phase-to-phase faults, and improve the reliability of relay protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. is a schematic structural diagram of a vacuum circuit breaker closing and opening insulating operation toggle arm structure without an insulating pull rod.

[0017] Figure 2 FIG. is a side view of a vacuum circuit breaker closing and opening insulating operation toggle arm structure without an insulating pull rod.

[0018] Figure 3 FIG. is a schematic diagram of the closing state of a vacuum circuit breaker closing and opening insulating operation toggle arm structure without an insulating pull rod.

[0019] Figure 4 FIG. is a schematic diagram of the opening state of a vacuum circuit breaker closing and opening insulating operation toggle arm structure without an insulating pull rod.

[0020] Among them, 1. Vacuum interrupter, 2. Moving contact rod, 3. Toggle arm, 30. Opening, 4. Main shaft of the circuit breaker, 5. Limit pad, 6. Rectangular spring, 7. Toggle arm seat, 8. Stud ejector rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will elaborate on the preferred embodiments of the present utility model in conjunction with the accompanying drawings, so that the advantages and features of the utility model can be more easily understood by those skilled in the art, thereby making the protection scope of the present utility model clearer and more definite.

[0022] Please refer to Figures 1 to 4 , the embodiments of the present utility model include:

[0023] A structure of a closing and opening insulating operating crank arm for a vacuum circuit breaker without an insulating pull rod. This structure of the closing and opening insulating operating crank arm for a vacuum circuit breaker without an insulating pull rod includes a vacuum interrupter 1, a moving contact rod 2, a crank arm 3, a circuit breaker main shaft 4, a limit pad 5, and a rectangular spring 6. The lower end of the vacuum interrupter 1 extends out the moving contact rod 2, and the lower end of the moving contact rod 2 is clamped with the crank arm 3. The crank arm 3 rotates with the circuit breaker main shaft 4. The circuit breaker main shaft 4 is made of a metal round bar with a diameter > Φ30mm, having high strength and good electric field. The rotation of the crank arm 3 drives the moving contact rod 2 to move up and down to perform the closing and opening of the vacuum circuit breaker. An opening 30 for avoiding the moving contact rod 2 is provided on the crank arm 3. A limit pad 5 is installed at the bottom of the moving contact rod 2 passing through the opening 30, and a rectangular spring 6 is sleeved on the moving contact rod 2 above the opening 30. The limit pad 5 and the rectangular spring 6 cooperate to clamp the moving contact rod 2 at the opening of the crank arm 3.

[0024] The top surface and the bottom surface of the crank arm 3 face the rectangular spring 6 and the limit pad 5 respectively, and guiding inclined surfaces are symmetrically arranged on both the top surface and the bottom surface. When closing, the circuit breaker main shaft 4 drives the crank arm 3 to rotate clockwise. The left guiding inclined surface on the top surface contacts the rectangular spring 6, and the right guiding inclined surface on the bottom surface contacts the limit pad 5. The moving contact rod 2 is in the upper position. When opening, the circuit breaker main shaft 4 drives the crank arm 3 to rotate counterclockwise. The right guiding inclined surface on the top surface contacts the rectangular spring 6, and the left guiding inclined surface on the bottom surface contacts the limit pad 5. The moving contact rod 2 is in the lower position; The crank arm 3 is made of a metal material with high strength and high mechanical life. The crank arm 3 is designed with increased thickness and width, and the electric field can be designed to eliminate corona partial discharge.

[0025] The crank arm 3 is insulated and connected to the circuit breaker main shaft 4 through a crank arm seat 7. The crank arm seat 7 is installed on the circuit breaker main shaft 4, and the crank arm 3 is installed on the crank arm seat 7. The crank arm seat 7 is made of an insulating material; The crank arm seat 7 is directly cast with epoxy resin on the circuit breaker main shaft 4, which can achieve a structure with only relative ground insulation like that of an insulating pull rod, reducing the probability of phase-to-phase faults and improving the reliability of relay protection.

[0026] A structure of a closing and opening insulating operating crank arm for a vacuum circuit breaker without an insulating pull rod further includes a stud ejector rod 8. A stud ejector rod 8 pointing to the moving contact rod 2 is horizontally placed at the opening 30 of the crank arm 3. The other end of the stud ejector rod 8 is connected to the insulating cover where the vacuum interrupter 1 is located. The setting of the stud ejector rod 8 prevents the moving contact rod 2 from disengaging from the opening 30 during operation.

[0027] The utility model relates to a closing and opening insulating operating crank arm structure of a vacuum circuit breaker without an insulating pull rod. The rotation of the crank arm drives the closing and opening, simplifies the operating structure, eliminates the need for an insulating pull rod and a complex connecting rod structure, is easy to install, occupies a small space, and has great economic benefits.

[0028] The above are only embodiments of the present utility model, and do not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A vacuum circuit breaker opening and closing insulation operation lever structure without an insulating pull rod, characterized by: The invention comprises a vacuum interrupter (1), a moving contact rod (2), a crank arm (3), a circuit breaker main shaft (4), a limiting pad (5) and a rectangular spring (6); the moving contact rod (2) extends from the lower end of the vacuum interrupter (1); the lower end of the moving contact rod (2) is clamped with a crank arm (3); the crank arm (3) rotates along with the circuit breaker main shaft (4); the rotation of the crank arm (3) drives the moving contact rod (2) to move up and down, thereby opening and closing the vacuum circuit breaker; the crank arm (3) is provided with an opening (30) for avoiding the moving contact rod (2); a limiting pad (5) is installed at the bottom of the moving contact rod (2) passing through the opening (30); a rectangular spring (6) is sleeved on the moving contact rod (2) above the opening (30); the limiting pad (5) and the rectangular spring (6) cooperate to clamp the moving contact rod (2) at the opening of the crank arm (3).

2. The insulating operating lever structure for opening and closing of a vacuum circuit breaker without an insulating pull rod according to claim 1, characterized in that: The top surface and bottom surface of the crank arm (3) are respectively opposite to the rectangular spring (6) and the limiting pad (5), and the top surface and the bottom surface are both symmetrically provided with guiding inclined surfaces.

3. The insulating operating lever structure for opening and closing of a vacuum circuit breaker without an insulating pull rod according to claim 1, characterized in that: The crank arm (3) is made of metal and is designed to be thickened and widened.

4. The insulating operating lever structure for opening and closing of a vacuum circuit breaker without an insulating pull rod according to claim 1, characterized in that: The crank arm (3) is insulatedly connected to the circuit breaker main shaft (4) via a crank arm seat (7); the crank arm seat (7) is mounted on the circuit breaker main shaft (4); the crank arm (3) is mounted on the crank arm seat (7); and the crank arm seat (7) is made of insulating material.

5. The insulating operating lever structure for opening and closing of a vacuum circuit breaker without an insulating pull rod according to claim 4, characterized in that: Epoxy resin is directly poured onto the circuit breaker main shaft (4) to form a crank arm seat (7).

6. The insulating operating lever structure for opening and closing of a vacuum circuit breaker without an insulating pull rod according to claim 1, characterized in that: The circuit breaker main shaft (4) is made of a metal round bar with a diameter greater than Φ30 mm.

7. The insulating operating lever structure for opening and closing of a vacuum circuit breaker without an insulating pull rod according to claim 1, characterized in that: It also includes a stud top rod (8), which is placed horizontally at the opening (30) of the crank arm (3) and points to the moving contact rod (2), and the other end of the stud top rod (8) is connected to the insulating cover where the vacuum interrupter (1) is located.

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