Three-station isolating switch with opening and closing position self-locking function

Abstract

The utility model discloses a three-station isolating switch with opening and closing position self-locking, which comprises a feeler lever, a circuit breaker static contact, a main static contact, a grounding static blade, a main shaft, a stop crank arm and an insulating pull rod, the feeler lever is rotatably arranged on the circuit breaker static contact, the main static contact is arranged above the circuit breaker static contact, and the grounding static blade is arranged above the main static contact. A grounding static blade is arranged at the side end of a static contact of the circuit breaker, a main shaft is rotatably installed at the grounding static blade, a stop crank arm is installed on the main shaft, the contact rod and the stop crank arm are rotatably connected through an insulating pull rod, and the stop crank arm extends outwards to be provided with a connecting part used for being rotatably connected with the insulating pull rod. A right-angle spigot is formed in one end, close to the main shaft, of the connecting part. Through the above mode, the self-locking device is large in rotation angle, suitable for an environment-friendly switch with a large opening distance, capable of self-locking a closing position and a grounding position, safe and reliable, and capable of reducing mechanical impact, protecting mechanical parts and prolonging the service life of equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage power distribution equipment, in particular to a three-position disconnector with self-locking for closing and opening positions. Background Art

[0002] Medium-voltage 3.6 - 40.5 kV ring main unit usually adopts a knife-switch type three-position disconnector. The three positions are closing position, opening position, and grounding position respectively. The closing position is set on the mechanism side, the opening position isolates the main static blade, and the grounding position is at the grounding static blade. Position-limiting devices are usually designed at the closing position and the grounding position. Although direct position-limiting can be achieved, there are the following defects: the position-limiting devices generate floating potentials and sharp corners, which are prone to cause electric discharges. The position-limiting devices often adopt baffles. If no position-limiting device is set, the mechanism output that needs to be mounted is required to have a reliable angle, and the requirements are relatively high.

[0003] Based on the above defects and deficiencies, it is necessary to improve the existing technology and design a three-position disconnector with self-locking for closing and opening positions. Summary of the Utility Model

[0004] The main technical problem to be solved by the utility model is to provide a three-position disconnector with self-locking for closing and opening positions, which has a large rotation angle, is suitable for environmental protection switches with a large opening distance, can self-lock in the closing and grounding positions, is safe and reliable, reduces mechanical impact, protects mechanical components, and extends the service life of the equipment.

[0005] To solve the above technical problem, a technical solution adopted by the utility model is: to provide a three-position disconnector with self-locking for closing and opening positions. The three-position disconnector with self-locking for closing and opening positions includes a contact rod, a circuit breaker static contact, a main static contact, a grounding static blade, a main shaft, a position-limiting crank arm, and an insulating pull rod. The contact rod is rotatably installed on the circuit breaker static contact. A main static contact is arranged above the circuit breaker static contact. A grounding static blade is arranged at the side end of the circuit breaker static contact. The main shaft is rotatably installed at the grounding static blade. A position-limiting crank arm is installed on the main shaft. The contact rod and the position-limiting crank arm are rotatably connected through the insulating pull rod. The position-limiting crank arm extends outward and is provided with a connecting portion for rotatably connecting the insulating pull rod. A right-angle stop is arranged at one end of the connecting portion close to the main shaft. When the main shaft rotates and drives the blade to rotate and contact the grounding static blade through the insulating pull rod, the right-angle stop faces upward to stop the contact rod.

[0006] Preferably, the contact rod, the circuit breaker static contact, the main shaft, the position-limiting crank arm, and the insulating pull rod form a four-bar linkage mechanism. The dead points of the input and output of the four-bar linkage mechanism are designed as the closing position and the grounding position.

[0007] Preferably, the contact rod adopts two moving blades. The two moving blades are connected by bolts. Raised contacts are arranged on the opposite surfaces of the upper parts of the two moving blades.

[0008] Preferably, the main shaft is made of metal material.

[0009] Preferably, the main shaft is grounded.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] It has a large rotation angle, is suitable for environmental protection switches with a large opening distance, realizes the operation of the moving blade with only one insulating pull rod, and has a low cost;

[0012] The closing and grounding positions can be self-locked, which is safe and reliable, reduces mechanical impact, protects mechanical components, extends the service life of the equipment, avoids using additional stop devices, and has no floating potential;

[0013] Reduces the use of composite insulating materials, has more reliable performance and a longer mechanical life;

[0014] The metal main shaft is grounded, with good electric field and high strength. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the closing state of a three-position disconnecting switch with self-locking of closing and opening positions.

[0016] Figure 2 It is a schematic diagram of the grounding state of a three-position disconnecting switch with self-locking of closing and opening positions.

[0017] Figure 3 It is a schematic diagram of the structure of a three-position disconnecting switch with self-locking of closing and opening positions.

[0018] Among them, 1. contact rod, 11. moving blade, 10. contact point, 2. static contact of the circuit breaker, 3. main static contact, 4. grounding static blade, 5. main shaft, 6. stop crank arm, 61. connecting part, 62. right-angle stop, 7. insulating pull rod. Detailed Embodiment

[0019] The following combines the drawings to elaborate on the preferred embodiments of the present utility model, so that the advantages and features of the utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present utility model.

[0020] Please refer to Figures 1 to 3 , the embodiments of the present utility model include:

[0021] A three-position disconnector with self-locking for closing and opening positions. This three-position disconnector with self-locking for closing and opening positions includes a contact rod 1, a static contact of the circuit breaker 2, a main static contact 3, a grounding static blade 4, a main shaft 5, a stop crank arm 6, and an insulating pull rod 7. The contact rod 1 is rotatably installed on the static contact of the circuit breaker 2. Above the static contact of the circuit breaker 2, there is a main static contact 3. On the side end of the static contact of the circuit breaker 2, there is a grounding static blade 4. The main shaft 5 is rotatably installed at the grounding static blade 4. The main shaft 5 is made of metal. A stop crank arm 6 is installed on the main shaft 5. The contact rod 1 and the stop crank arm 6 are rotatably connected through the insulating pull rod 7. The stop crank arm 6 extends outward and is provided with a connecting portion 61 for rotatably connecting the insulating pull rod 7. One end of the connecting portion 61 close to the main shaft 5 is provided with a right-angle stop 62. When the main shaft 5 rotates and drives the blade 1 to rotate and contact the grounding static blade 4 through the insulating pull rod 7, the right-angle stop 62 faces upward to stop the contact rod 1.

[0022] The contact rod 1, the static contact of the circuit breaker 2, the main shaft 5, the stop crank arm 6, and the insulating pull rod 7 form a four-bar linkage mechanism. The dead-point positions of the input and output of the four-bar linkage mechanism are designed as the closing position and the grounding position. The dead point of the four-bar linkage mechanism refers to the extreme position where the input or output link of the linkage system is located. At this time, the speed of the link is zero and the kinematic state of the mechanical system is relatively stable. Near the dead point, the movement of the linkage mechanism becomes very slow, which can play a buffering effect. When the four-bar linkage mechanism approaches the dead point, the speed and acceleration of the link are significantly reduced. Using this characteristic, appropriate dead-point positions can be designed in the movement process of the mechanical system to provide a buffering effect where deceleration or stop is required. This buffering can effectively reduce mechanical shock, protect mechanical components, and extend the service life of the equipment. When the contact rod 1 rotates and contacts the main static contact 3, it is at the dead-point position of the four-bar linkage mechanism at this time. When the contact rod 1 rotates and contacts the grounding static blade 4, it is at the dead-point position of the four-bar linkage mechanism at this time. The speed and acceleration of the contact rod 1 are significantly reduced, and the dead-point position provides a buffering effect.

[0023] The contact rod 1 adopts two moving blades 11. The two moving blades are connected by bolts. On the opposite upper surfaces of the two moving blades 11, there are raised contacts 10. During the closing process, the two contacts 10 contact the main static contact 3 for friction deceleration. During the grounding process, the contacts 10 contact the grounding static blade 4 for friction deceleration.

[0024] The main shaft 5 is grounded, with good electric field and high strength.

[0025] When the three-position disconnecting switch with self-locking for closing and opening positions of the present utility model is in operation, for closing: the main shaft 5 rotates counterclockwise, driving the contact rod 1 to rotate counterclockwise along the static contact 2 of the circuit breaker through the insulating pull rod 7. The connecting part 61 of the stop crank arm 6 and the insulating pull rod 7 are in a nearly straight state. At this time, the four-bar linkage mechanism is in the dead center position. The upper contacts 10 of the two moving blades 11 contact the main static contact 3, and the friction decelerates to complete the closing operation.

[0026] For opening: the main shaft 5 rotates clockwise, driving the contact rod 1 to rotate clockwise along the static contact 2 of the circuit breaker through the insulating pull rod 7. The contact rod 1 rotates to the middle position between the main static contact 3 and the grounding static blade 4.

[0027] For grounding: the main shaft 5 continues to rotate clockwise, driving the contact rod 1 to rotate clockwise along the static contact 2 of the circuit breaker through the insulating pull rod 7 until the right-angle notch 62 of the stop crank arm 6 blocks the contact rod 1. At this time, the four-bar linkage mechanism is in another dead center position. The upper contacts 10 of the two moving blades 11 contact the grounding static blade 4, and the friction decelerates to complete the grounding operation.

[0028] The three-position disconnecting switch with self-locking for closing and opening positions of the present utility model has a large rotation angle, is suitable for environmental protection switches with a large opening distance, and can self-lock in the closing and grounding positions, which is safe and reliable, reduces mechanical impact, protects mechanical components, and extends the service life of the equipment.

[0029] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present utility model.

Claims

1. A three-position disconnector with self-locking in opening and closing positions, characterized in that: The invention comprises a contact rod (1), a circuit breaker static contact (2), a main static contact (3), a grounding static blade (4), a main shaft (5), a stop crank arm (6) and an insulating pull rod (7), wherein the contact rod (1) is rotatably mounted on the circuit breaker static contact (2), the main static contact (3) is arranged above the circuit breaker static contact (2), a grounding static blade (4) is arranged at the side end of the circuit breaker static contact (2), a main shaft (5) is rotatably mounted at the grounding static blade (4), and a stop crank arm (6) is arranged on the main shaft (5). The contact rod (1) and the stop arm (6) are rotatably connected via an insulating pull rod (7); the stop arm (6) is extended outwardly and is provided with a connecting portion (61) for rotatably connecting to the insulating pull rod (7); a right-angle stop (62) is provided at one end of the connecting portion (61) close to the main shaft (5); when the main shaft (5) rotates to drive the contact rod (1) to contact the grounded static blade (4) via the insulating pull rod (7), the right-angle stop (62) faces upwards to stop the contact rod (1).

2. A three-position disconnector with self-locking in opening and closing positions according to claim 1, characterized in that: The contact rod (1), the circuit breaker static contact (2), the main shaft (5), the stop arm (6) and the insulating pull rod (7) form a four-bar linkage mechanism, and the dead point positions of the input and output of the four-bar linkage mechanism are designed to be the closing position and the contact position.

3. A three-position disconnector with self-locking in opening and closing positions according to claim 1, characterized in that: The contact rod (1) adopts two movable blades (11), which are connected by bolts, and the upper opposite surfaces of the two movable blades (11) are provided with raised contact points (10).

4. A three-position disconnector with self-locking in opening and closing positions according to claim 1, characterized in that: The main shaft (5) is made of metal.

5. A three-position disconnector with self-locking in opening and closing positions according to claim 1, characterized in that: The main shaft (5) is grounded.

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