Three-position isolating switch

Abstract

The utility model relates to the technical field of isolating switches, in particular to a three-station isolating switch, which comprises an isolating frame, an insulating main shaft rotatably mounted in the isolating frame, and an insulating beam arranged above the inner side of the isolating frame and parallel to the axis of the insulating main shaft, a busbar parallel to the axis of the insulating main shaft is arranged above the other end opposite to the insulating beam, three insulating crank arms are arranged on the insulating main shaft at equal intervals, the insulating crank arms and the insulating main shaft are integrated, and the moving cutters are poured in the insulating crank arms. According to the utility model, the insulating main shaft, the insulating crank arm and the moving knife are poured into an integrated structure through APG (automatic pressure gel), so that the electrical clearance is avoided, the electrical performance is good, the partial discharge is small, the strength of the insulating main shaft is high, the operation deformation is small, and the synchronism among three phases is better; the movable cutter is provided with the detachable contact, so that the contact can be conveniently and independently replaced, the whole insulating main shaft does not need to be replaced, the maintenance efficiency is improved, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of isolating switches, in particular to a three-position isolating switch. Background Art

[0002] An isolating switch is an electrical device mainly used for "isolating power supply, switching operations, and connecting and disconnecting low-current circuits".

[0003] The Chinese utility model patent document with patent number CN206271603U discloses an insulating main shaft structure of a three-position disconnector, which includes an isolation frame, an isolation operating mechanism and an insulating main shaft installed in the isolation frame; the isolation operating mechanism is drivingly connected to the insulating main shaft; the insulating main shaft includes a left operating shaft, a right operating shaft and an intermediate operating shaft, which are connected in sequence to form a three-axis connector, and the three-axis connector is cast by APG to form an insulating main shaft; two knife switches are directly fixedly connected to the left operating shaft, the intermediate operating shaft and the right operating shaft.

[0004] The prior art also has the following defects during use: the knife switch is directly fixedly connected to the left operating shaft, the middle operating shaft and the right operating shaft. This fixing method is not flexible enough and is difficult to adapt to the requirements under different working conditions and loads. When the knife switch is worn and damaged, the entire insulating main shaft may need to be replaced instead of just the damaged part, which increases the maintenance cost, the complexity of installation and replacement, and takes a long time.

[0005] In view of this, we propose a three-position isolating switch to solve the existing problem. Utility Model Content

[0006] The purpose of the utility model is to provide a three-position isolating switch to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a three-position isolating switch, comprising an isolating frame, an insulating main shaft rotatably installed in the isolating frame, an insulating beam parallel to the axis of the insulating main shaft is provided on the upper inner side of the isolating frame, a bus parallel to the axis of the insulating main shaft is provided above the other end of the insulating beam, the insulating main shaft is provided with an insulating crook arm, the insulating crook arm has three insulating crook arms, which are equidistantly arranged on the insulating main shaft, the top of the insulating crook arm is provided with a moving knife, the insulating main shaft, the insulating crook arm and the moving knife are integrally cast by APG, and contacts are detachably installed at both ends of the moving knife.

[0008] Preferably, the insulating main shaft further includes a rotating shaft, which is arranged on the central axis of the insulating main shaft, and the rotation of the rotating shaft drives the insulating main shaft to rotate.

[0009] Preferably, one end of the rotating shaft passes through the side wall of the isolation frame and is arranged outside the isolation frame, and is provided with a connecting key, through which an external driving device for driving the insulating main shaft to rotate is connected.

[0010] Preferably, the isolation frame further comprises a crossbeam connected to the side walls at opposite ends of the isolation frame, and the busbar is fixed to the side wall at one end of the crossbeam located inside the isolation frame.

[0011] Preferably, the busbar is provided with a ground knife, and three ground knives are provided. The three ground knives are equidistantly arranged on the end face of the busbar and correspond to the positions of the insulating crooked arms on the insulating main shaft.

[0012] Preferably, a static contact seat is provided on the insulating beam, and there are three static contact seats, which are equidistantly arranged on the insulating beam and correspond to the positions of the insulating crooked arms of the insulating main shaft.

[0013] Preferably, an insulating beam shed is provided between two adjacent stationary contact seats or between a stationary contact seat and a side wall of the isolation frame.

[0014] Preferably, an insulating main shaft shed is provided between two adjacent insulating crooked arms on the insulating main shaft or between the insulating crooked arm and the side wall of the isolation frame, and the insulating main shaft shed is integrally cast with the insulating main shaft by APG.

[0015] Preferably, both side ends of the movable knife are fastened with detachable contacts by bolts.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the utility model uses APG (automatic pressure gel) to cast the insulating main shaft, insulating crooked arm and movable knife into an integrated structure, so that the insulating main shaft has high strength, small operating deformation, and better synchronization between the three phases; the movable knife is provided with a detachable contact, which can be easily replaced separately without replacing the entire insulating main shaft, thereby improving maintenance efficiency and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model in a disconnected working position;

[0018] Figure 2 It is a three-dimensional structural schematic diagram of the utility model in a closing position state;

[0019] Figure 3 It is a schematic diagram of the structure of the utility model in a top view in a disconnected working position;

[0020] Figure 4 It is a front structural schematic diagram of the utility model in a closing position state.

[0021] In the figure: 1. Isolation frame; 2. Insulation main shaft; 21. Rotating shaft; 22. Insulation crank arm; 23. Contact; 24. Moving knife; 25. Insulation main shaft shed; 3. Insulation beam; 31. Static contact seat; 32. Insulation beam shed; 4. Crossbeam; 5. Bus; 51. Ground knife. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] Embodiment 1

[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a three-position disconnector proposed by the utility model comprises an isolation frame 1, an insulating main shaft 2 rotatably mounted in the isolation frame 1, an insulating beam 3 parallel to the axis of the insulating main shaft 2 is provided on the upper inner side of the isolation frame 1, a bus 5 parallel to the axis of the insulating main shaft 2 is provided on the upper side of the other end of the insulating beam 3, an insulating crank arm 22 is provided on the insulating main shaft 2, three insulating crank arms 22 are equidistantly arranged on the insulating main shaft 2, a movable knife 24 is provided on the top of the insulating crank arm 22, the insulating main shaft 2, the insulating crank arm 22 and the movable knife 24 are integrally cast by APG, contacts 23 are detachably mounted on both ends of the movable knife 24, the insulating main shaft 2 rotates, driving the insulating crank arm 22 and the movable knife 24 thereon to rotate together, according to the rotation direction of the insulating main shaft 2, the movable knife 24 can choose to contact with the static contact seat 31 or the bus 5 on the insulating beam 3 or neither of them, thereby realizing the conversion of the circuit between the three positions of connection, disconnection and grounding.

[0025] Furthermore, the insulating main shaft 2 shown further includes a rotating shaft 21 , which is disposed on the central axis of the insulating main shaft 2 , and the rotating shaft 21 drives the insulating main shaft 2 to rotate when it rotates.

[0026] Furthermore, one end of the rotating shaft 21 passes through the side wall of the isolation frame 1 and is arranged on the outside of the isolation frame 1, and is provided with a connecting key, through which an external driving device that drives the insulating main shaft 2 to rotate is connected. When the external driving device drives the rotating shaft 21 to rotate, the insulating main shaft 2 will rotate accordingly. During the rotation process, the moving knife 24 on the insulating crooked arm 22 can selectively contact or separate from the static contact seat 31 on the insulating beam 3 or the ground knife 51 on the bus 5 to achieve the conduction or disconnection of the circuit.

[0027] Furthermore, the isolation frame 1 further comprises a crossbeam 4 connected to the side walls at opposite ends of the isolation frame 1 , and the busbar 5 is fixed to the side wall at one end of the crossbeam 4 located inside the isolation frame 1 .

[0028] Furthermore, a grounding knife 51 is provided on the bus 5, and there are three grounding knives 51. The three grounding knives 51 are equidistantly arranged on the end face of the bus 5, corresponding to the position of the insulating crooked arm 22 on the insulating main shaft 2. The insulating crooked arm 22 is in contact with the bus 5, and the movable knife 24 and the contact 23 are in contact with the grounding knife 51 and are connected, and the isolating switch is in the grounding protection position.

[0029] Furthermore, a static contact seat 31 is provided on the insulating beam 3. There are three static contact seats 31, which are equidistantly arranged on the insulating beam 3 and correspond to the positions of the insulating crooked arms 22 of the insulating main shaft 2. The insulating crooked arms 22 are in contact with the insulating beam 3, the moving blade 24 and the contact 23 are in contact with the static contact seat 31, and the isolating switch is in the on state.

[0030] Furthermore, an insulating beam shed 32 is provided between two adjacent stationary contact seats 31 or between the stationary contact seat 31 and the side wall of the isolation frame 1 .

[0031] Furthermore, an insulating main shaft shed 25 is provided between two adjacent insulating arms 22 on the insulating main shaft 2 or between the insulating arms 22 and the side wall of the isolation frame 1. The insulating main shaft shed 25 and the insulating main shaft 2 are integrally cast by APG to ensure the reliability of electrical isolation.

[0032] Furthermore, the two side ends of the movable knife 24 are fastened with detachable ground contacts 23 by bolts, which facilitates the adjustment or replacement of severely worn contacts 23. By adjusting the relative position between the contacts 23 and the movable knife 24, or adjusting the torque of the bolts, the contact performance between the movable knife 24, the contacts 23 and the stationary contact seat 31 or the ground knife 51 can be optimized, making the connection more secure and improving the reliability and stability of the electrical connection.

[0033] The working principle of the three-position disconnector based on the first embodiment is as follows: the main material of the shaft body of the insulating main shaft 2 is epoxy resin, and the insulating main shaft 2 is cast and connected as a whole with the insulating crank arm 22, the movable knife 24, the rotating shaft 21, and the insulating main shaft shed 25 by APG (automatic pressure gel), and the contact 23 is fixed to the movable knife 24 by bolts. When the three-position switch needs to be isolated and closed, the insulating main shaft 2 will drive the movable knife 24 and the contact 23 to rotate toward the static contact seat 31 under the action of the external drive device until all are in contact, and the isolation and closing are completed; when the three-position switch needs to be isolated and opened, the insulating main shaft 2 will drive the movable knife 24 and the contact 23 to rotate in the opposite direction of the isolation and closing under the action of the external drive device until all are disengaged and reach the specified position, and the isolation and opening are completed; the external drive device drives the insulating main shaft 2 to rotate toward the side of the bus 5, and contacts or separates from the bus 5, thereby realizing the grounding closing or grounding opening operation.

[0034] The above-mentioned specific embodiments are only several preferred embodiments of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above-mentioned embodiments, those skilled in the art can make various alternative improvements and combinations to the above-mentioned specific embodiments.

Claims

1. A three-position disconnector, comprising an isolation frame (1), an insulating main shaft (2) rotatably mounted in the isolation frame (1), an insulating beam (3) parallel to the axis of the insulating main shaft (2) provided on the upper inner side of the isolation frame (1), and a bus bar (5) parallel to the axis of the insulating main shaft (2) provided on the upper side opposite to the other end of the insulating beam (3), characterized in that: The insulating main shaft (2) is provided with an insulating crank arm (22), and the insulating crank arm (22) has three insulating crank arms (22) which are equidistantly arranged on the insulating main shaft (2), and the movable knife (24) is cast inside the insulating crank arm (22). The insulating main shaft (2), the insulating crank arm (22), and the movable knife (24) are integrally cast by APG, and contacts (23) are detachably mounted on both side ends of the movable knife (24).

2. A three-position isolating switch according to claim 1, characterized in that: The insulating main shaft (2) further comprises a rotating shaft (21), wherein the rotating shaft (21) is arranged on the central axis of the insulating main shaft (2), and the rotating shaft (21) rotates to drive the insulating main shaft (2) to rotate.

3. A three-position isolating switch according to claim 2, characterized in that: One end of the rotating shaft (21) passes through the side wall of the isolation frame (1) and is arranged outside the isolation frame (1). A connecting key is provided, and an external driving device for driving the insulating main shaft (2) to rotate is connected via the connecting key.

4. A three-position isolating switch according to claim 1, characterized in that: The isolation frame (1) further comprises a crossbeam (4) connected to the side walls at two opposite ends of the isolation frame (1), and the busbar (5) is fixed to the side wall at one end of the crossbeam (4) located inside the isolation frame (1).

5. A three-position isolating switch according to claim 4, characterized in that: The busbar (5) is provided with a ground knife (51), and three ground knives (51) are provided. The three ground knives (51) are equidistantly arranged on the end face of the busbar (5) and correspond to the positions of the insulating crooked arms (22) on the insulating main shaft (2).

6. A three-position isolating switch according to claim 1, characterized in that: The insulating beam (3) is provided with a static contact seat (31), and the static contact seats (31) are in number and are equidistantly arranged on the insulating beam (3) and correspond to the positions of the insulating crank arms (22) of the insulating main shaft (2).

7. A three-position isolating switch according to claim 6, characterized in that: An insulating beam shed (32) is provided between two adjacent stationary contact seats (31) and between the stationary contact seat (31) and the side wall of the isolation frame (1).

8. A three-position isolating switch according to claim 1, characterized in that: An insulating main shaft shed (25) is provided between two adjacent insulating crooked arms (22) on the insulating main shaft (2) and between the insulating crooked arm (22) and the side wall of the isolation frame (1); the insulating main shaft shed (25) and the insulating main shaft (2) are integrally cast by APG.

9. A three-position isolating switch according to claim 1, characterized in that: Both side ends of the movable knife (24) are fastened with detachable contacts (23) via bolts.

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