Three-position isolating switch assembly

Abstract

A swing arm is sleeved on a driving shaft, the other end of the swing arm is hinged to one end of a connecting rod, the other end of the connecting rod is hinged to a knife switch, the knife switch is hinged to a knife holder, and the driving shaft drives the knife switch to switch among three states of opening, closing or grounding through the swing arm and the connecting rod. When the switch is in a closing position or a grounding position, better force application angles are formed between the swing arm and the connecting rod, between the connecting rod and the switch blade and between the swing arm and the switch blade, and the switch blade can obtain larger torque, so that the switch blade is easy to open in the closing position or the grounding position.

Description

Technical Field

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

[0002] Environmental protection cabinet refers to the electrical equipment (high voltage switchgear) installed in metal or non-metallic insulation cabinet or made into assembled interval ring network power supply unit. It is widely used in distribution stations and box-type substations in urban residential areas, high-rise buildings, large public buildings, factories and enterprises and other load centers. Environmental protection cabinets are divided into upper isolation environmental protection cabinets (isolating switch on the top, circuit breaker on the bottom) and lower isolation environmental protection cabinets (isolating switch on the bottom, circuit breaker on the top) according to the different upper and lower positions of the isolating switch.

[0003] The frame of the isolating switch assembly is provided with a driving shaft, a static contact, and a grounding contact; a swing arm is sleeved on the driving shaft, and the other end of the swing arm is hinged to one end of a connecting rod, and the other end of the connecting rod is hinged to the middle of the knife, and one end of the knife is hinged to the knife seat; the driving shaft can drive the swing arm to rotate, and the swing arm drives the knife to swing through the connecting rod to switch between the three states of opening, closing or grounding. The existing isolating switch assembly has the following problems during use: (1) When the knife and the swing arm are turned to the closing position, the connecting rod and the swing arm are very close, and the force decomposed to the connecting rod when the swing arm swings is relatively small, which results in a relatively small torque on the knife, which makes it difficult to open the knife in the closing position. When the knife and the swing arm are turned to the grounding position, the connecting rod and the swing arm are almost in a straight line, and the knife and the swing arm are almost parallel, so that the force decomposed to the connecting rod when the swing arm swings is smaller, and the torque obtained by the knife is smaller, which makes it more difficult to open the knife in the grounding position, and it is more difficult to open. Since the torque of the knife in the closing position and the contact position is small, in order to obtain a larger torque, the size specifications of the knife, connecting rod, swing arm, etc. can only be designed to be large to meet the requirements. This will make the entire switch device very large, not only increasing the cost, but also requiring a large installation space. (2) When in the contact position, the knife swings down at a large angle, requiring a large travel space; and since the grounding travel angle from the opening position to the contact position is large, it also requires a large travel space, which requires the switch device to reserve a large space, which further increases the space size of the entire switch device, increases the cost, and increases the requirements for installation space. (3) In order to meet the insulation withstand voltage level, the existing disconnector structure usually needs to be made very large, and a transparent insulating cover is also required to serve as auxiliary insulation, which not only makes the structure complicated, but also increases the cost. Utility Model Content

[0004] In view of the shortcomings of the above-mentioned existing isolating switch assemblies, the applicant provides a three-position isolating switch assembly with a reasonable structure, which increases the torque of the swing arm in the closed position and the connected position, makes the knife switch easier to open in the closed position and the connected position, and makes the overall structure more compact and small, reducing the cost and the requirements for installation space.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A three-position disconnector assembly, wherein a swing arm is sleeved on a driving shaft, the other end of the swing arm is hinged to one end of a connecting rod, the other end of the connecting rod is hinged to a knife, the knife is hinged to a knife seat, and the driving shaft drives the knife to switch between the three states of opening, closing or grounding through the swing arm and the connecting rod; when the knife is in the closing position, the angle ε between the line AB connecting the hinge center points A and B of the knife and the swing arm and the connecting rod and the center line CL52 of the swing arm closing position is 34°-44°, and the line AB and the knife closing position are 34°-44°. The angle μ between the center lines CL32 is 86°-96°; when the knife is in the engaged position, the angle γ between the center line CL33 of the knife engaged position and the center line CL53 of the swing arm engaged position is 17°-27°, the angle τ between the line AB connecting the hinge centers A and B of the knife, the swing arm and the connecting rod 4 and the center line CL53 of the swing arm engaged position is 115°-125°, and the angle ξ between the connecting line AB and the center line CL33 of the knife engaged position is 33°-43°.

[0007] As a further improvement of the above technical solution:

[0008] When the knife is in the closing position, the angle δ between the center line CL52 of the swing arm closing position and the X-axis is 18°-28°, and the angle σ between the center line CL32 of the knife closing position and the X-axis is 68°-78°.

[0009] When the knife is in the contact position, the angle η between the center line CL33 of the knife contact position and the X-axis is 0°-10°.

[0010] The travel angle α of the swing arm from the open position to the closed position is 77°-87°, and the travel angle β from the open position to the contact position is 53°-63°.

[0011] The travel angle θ of the knife from the open position to the closed position is 51°-61°, and the travel angle λ from the open position to the connected position is 51°-61°.

[0012] The horizontal distance b1 between the blade rotation center O1 and the swing arm rotation center O2 is 48mm-52mm, and the vertical distance b2 between O1 and O2 is 33mm-37mm.

[0013] The straight-line distance b3 between the rotation center O1 of the gate knife and the hinge center A of the gate knife and the connecting rod is 93.1mm-97.1mm.

[0014] The straight-line distance b4 between the swing arm rotation center O2 and the swing arm and connecting rod articulation center B is 75mm-79mm.

[0015] The straight-line distance between the hinge center A of the knife and the connecting rod and the hinge center B of the swing arm and the connecting rod is 95.2mm-99.2mm.

[0016] The articulation center A between the connecting rod and the gate knife is set on the center line of the gate knife.

[0017] The beneficial effects of the utility model are as follows:

[0018] When the utility model is in the closing position, the connecting rod, the swing arm and the knife all have a good force angle, and the force decomposed to the connecting rod when the swing arm swings is relatively large, so that the knife can obtain a relatively large torque, so that the knife is easy to open in the closing position. In the connecting position, the swing arm and the connecting rod, the connecting rod and the knife, and the swing arm and the knife all have a good force angle, and the force decomposed to the connecting rod when the swing arm swings is relatively large, and the knife can obtain a large torque, so that the knife is easy to open in the connecting position. Moreover, since in the closing position or the connecting position, the swing arm and the connecting rod, the connecting rod and the knife, and the swing arm and the knife all have a good force angle, even if the size specifications of the knife, the connecting rod, the swing arm, etc. are designed to be small, the knife has the torque requirement that satisfies the easy opening in the closing position or the connecting position, so the whole set of switch devices can be set to be more compact and small, which is conducive to reducing costs and reducing the requirements for installation space.

[0019] When the utility model is in the contact position, the angle of the knife switch relative to the X-axis is small, which reduces the travel space and the reserved space in the switch device, so that the whole switch device can be arranged more compactly and is conducive to reducing costs and reducing the requirements for installation space.

[0020] The grounding stroke angle of the swing arm of the utility model is reduced, the stroke space is reduced, and the reserved amount of space in the switch device is reduced, so that the entire switch device can be arranged more compactly and delicately.

[0021] The overall structure of the utility model is more compact and smaller, which is conducive to reducing costs and reducing the requirements for installation space. Moreover, after optimizing the transmission structure between the swing arm, the connecting rod and the switch blade and optimizing the electric field structure, the size of the entire switch device can be further reduced on the basis of ensuring the insulation level of the switch, and there is no need to use a transparent insulation cover as auxiliary insulation, which saves the use of the transparent insulation cover, simplifies the structure and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the isolating switch assembly of the utility model in the open state.

[0023] Figure 2 It is a structural schematic diagram of the isolating switch assembly of the utility model in a closed state.

[0024] Figure 3 It is a structural schematic diagram of the isolating switch assembly of the utility model in a grounded state.

[0025] Figure 4 It is a schematic diagram of the positions of the knife center line and the swing arm center line of the isolating switch assembly of the utility model in the three states of open, closed and grounded.

[0026] In the above figure, the X-axis is the horizontal axis passing through the hinge center of the swing arm, and the Y-axis is the vertical axis passing through the hinge center of the swing arm.

[0027] In the figure: 1. frame; 2. driving shaft; 3. knife switch; 4. connecting rod; 5. swing arm; 6. knife holder; 7. static contact; 8. grounding contact. DETAILED DESCRIPTION

[0028] The specific implementation of the present utility model is described below in conjunction with the accompanying drawings.

[0029] refer to Figures 1 to 3 The utility model is provided with a driving shaft 2, a static contact 7, and a grounding contact 8 on a frame 1; a swing arm 5 is sleeved on the driving shaft 2, the other end of the swing arm 5 is hinged to one end of a connecting rod 4, the other end of the connecting rod 4 is hinged to a knife 3, and the knife 3 is hinged to a knife seat 6; the driving shaft 2 drives the knife 3 to switch between the three states of opening, closing or grounding through the swing arm 5 and the connecting rod 4: Figure 1 The figure shows a schematic diagram of the structure of the isolating switch assembly in the open state; Figure 2 The figure shows a schematic diagram of the structure of the isolating switch assembly in a closed state; Figure 3 The figure shows the schematic diagram of the structure of the isolating switch assembly in the grounding state. Figure 1 As shown, when the isolating switch assembly is in the open state, the outer end of the switch blade 3 is not in contact with the stationary contact 7 and the grounding contact 8; Figure 2 As shown, when the isolating switch assembly is in the closed state, the outer end of the switch blade 3 contacts the static contact 7; Figure 3 As shown, when the isolating switch assembly is in the grounding state, the outer end of the switch blade 3 contacts the grounding contact 8.

[0030] like Figures 1 to 4 As shown, the hinge center of the knife 3 and the knife seat 6 (i.e., the rotation center of the knife 3) is O1, and the center lines of the knife 3 in the three states of opening, closing, and grounding are CL 31 , CL 32 , CL 33 The rotation center of the swing arm 5 and the drive shaft 2 is O2, and the center lines of the swing arm 5 in the three states of opening, closing and grounding are CL51 , CL 52 , CL 53 The hinge center of the connecting rod 4 and the gate knife 3 is A. Point A coincides with the center line of the gate knife 3 and is located on the center line of the gate knife 3. The hinge center A of the connecting rod 4 and the gate knife 3 is set on the center line of the gate knife 3, which is conducive to reducing the size of the connection structure and making the structure more compact and small. The hinge center of the connecting rod 4 and the swing arm 5 is B.

[0031] refer to Figure 4 , the travel angle of knife 3 from the open position to the closed position (CL 31 With CL 32 The included angle between them)θ is 51°-61°, and the travel angle between the knife 3 from the open position to the closed position (CL 31 With CL 33 The included angle between the swing arm 5 and the closing position is 51°-61°. 51 With CL 52 The included angle between them) α is 77°-87°, and the travel angle between the swing arm 5 from the open position to the closed position (CL 51 With CL 53 The angle β between the swing arm 5 and the swing arm 5 is 53°-63°. Compared with the prior art, the grounding stroke angle of the swing arm 5 is reduced, the stroke space is reduced, and the reserved space in the switch device is reduced, so that the whole switch device can be arranged more compactly, which is conducive to reducing costs and reducing the requirements for installation space.

[0032] refer to Figure 2 , Figure 4 , when in the closing position, the center line CL of the swing arm 5 closing position 52 The angle δ between the blade 3 and the X axis is 18°-28°; the blade 3 is inclined toward the drive shaft 2, and the center line CL of the blade 3 in the closing position 32 The angle σ between the X-axis and the X-axis is an acute angle, σ is 68°-78°, which is more conducive to the swing arm 5 driving the connecting rod 4 to push the gate knife 3 upward, making the gate knife 3 easier to open. Figure 2 At this time, the line AB connecting the hinge centers A and B of the knife switch 3, the swing arm 5 and the connecting rod 4 and the center line CL of the closing position of the swing arm 5 52 The angle ε between them is 34°-44°, and the connecting line AB is connected with the center line CL of the closing position of the knife 3. 32 The angle μ between them is 86°-96°, that is, there is a good force angle between the connecting rod 4 and the swing arm 5 and the knife switch 3. When the swing arm 5 swings, the force decomposed to the connecting rod 4 is relatively large, so that the knife switch 3 can obtain a relatively large torque, making it easy to open the knife switch 3 when it is in the closed position.

[0033] refer to Figure 3 , Figure 4, when in the contact position, the switch 3 contact position center line CL 33 The angle η between the switch 3 and the X-axis is 0°-10°. The angle of the switch 3 relative to the X-axis is small, which reduces the travel space and the reserved space in the switch device, so that the whole switch device can be set more compact and small, which is conducive to reducing costs and reducing the requirements for installation space. 33 Center line CL in contact with swing arm 5 53 The angle γ between them is 17°-27°; the line AB connecting the hinge center points A and B of the knife 3, the swing arm 5 and the connecting rod 4 is connected to the center line CL of the swing arm 5 53 The angle τ between them is 115°-125°, and the connecting line AB is connected to the center line CL of the switch 3. 33 The angle ξ between them is 33°-43°; then there are good force angles between the swing arm 5 and the connecting rod 4, between the connecting rod 4 and the knife 3, and between the swing arm 5 and the knife 3. When the swing arm 5 swings, the force decomposed to the connecting rod 4 is large, and the knife 3 can obtain a large torque, so that the knife 3 is easy to open when it is in the connected position. Moreover, since there are good force angles between the swing arm 5 and the connecting rod 4, between the connecting rod 4 and the knife 3, and between the swing arm 5 and the knife 3 in the closed position or the connected position, even if the size specifications of the knife 3, the connecting rod 4, the swing arm 5, etc. are designed to be smaller, the knife 3 has the torque requirement that satisfies the easy opening in the closed position or the connected position. Therefore, the whole set of switch devices can be set to be more compact and small, which is conducive to reducing costs and reducing the requirements for installation space.

[0034] refer to Figure 1 , the horizontal distance b1 between the rotation center O1 of the knife 3 and the rotation center O2 of the swing arm 5 is 48mm-52mm, and the vertical distance b2 between O1 and O2 is 33mm-37mm; the rotation center O1 of the knife 3 and the rotation center O2 of the swing arm 5 are spaced in both the horizontal and vertical directions, which can effectively increase the opening torque of the knife 3 and make the knife 3 easier to open. The straight-line distance b3 between the rotation center O1 of the knife 3 and the hinge center A of the knife 3 and the connecting rod 4 is 93.1mm-97.1mm. The straight-line distance b4 between the rotation center O2 of the swing arm 5 and the hinge center B of the swing arm 5 and the connecting rod 4 is 75mm-79mm. The straight-line distance between the hinge center A of the knife 3 and the connecting rod 4 and the hinge center B of the swing arm 5 and the connecting rod 4 is 95.2mm-99.2mm.

[0035] The overall structure of the utility model is more compact and smaller, which is conducive to reducing costs and reducing the requirements for installation space. Moreover, after optimizing the transmission structure between the swing arm, the connecting rod and the switch blade and optimizing the electric field structure, the size of the entire switch device can be further reduced on the basis of ensuring the insulation level of the switch, and there is no need to use a transparent insulation cover as auxiliary insulation, which saves the use of the transparent insulation cover, simplifies the structure and reduces costs.

[0036] The above description is an explanation of the utility model, not a limitation of the utility model. The utility model can be modified in any form without violating the spirit of the utility model.

Claims

1. A three-position disconnector assembly, wherein a swing arm (5) is sleeved on a drive shaft (2), the other end of the swing arm (5) is hinged to one end of a connecting rod (4), the other end of the connecting rod (4) is hinged to a knife switch (3), the knife switch (3) is hinged to a knife seat (6), and the drive shaft (2) drives the knife switch (3) to switch between the three states of opening, closing or grounding through the swing arm (5) and the connecting rod (4); the characteristics are: When the knife switch (3) is in the closed position, the line AB connecting the hinge centers A and B of the knife switch (3) and the swing arm (5) and the connecting rod (4) is connected to the center line CL of the closed position of the swing arm (5). 52 The angle ε between them is 34°-44°, and the line AB is connected to the center line CL of the closing position of the knife (3). 32 The angle μ between them is 86°-96°; when the knife (3) is in the contact position, the center line CL of the knife (3) in the contact position 33 Center line CL of the swing arm (5) 53 The angle γ between them is 17°-27°, and the line AB connecting the hinge centers A and B of the knife (3) and the swing arm (5) with the connecting rod 4 is connected to the center line CL of the swing arm (5). 53 The angle τ between them is 115°-125°, and the connecting line AB is connected to the center line CL of the switch blade (3). 33 The included angle ξ is 33°-43°.

2. The three-position isolating switch assembly according to claim 1, characterized in that: When the knife (3) is in the closing position, the center line CL of the swing arm (5) in the closing position 52 The angle δ with the X-axis is 18°-28°, and the center line CL of the knife (3) in the closed position 32 The angle σ with the X-axis is 68°-78°.

3. The three-position isolating switch assembly according to claim 1, characterized in that: When the knife (3) is in the contact position, the center line CL of the knife (3) in the contact position 33 The angle η with the X-axis is 0°-10°.

4. The three-position isolating switch assembly according to claim 1, characterized in that: The travel angle α of the swing arm (5) from the open position to the closed position is 77°-87°, and the travel angle β from the open position to the contact position is 53°-63°.

5. The three-position isolating switch assembly according to claim 1, characterized in that: The travel angle θ of the knife switch (3) from the open position to the closed position is 51°-61°, and the travel angle λ from the open position to the connected position is 51°-61°.

6. The three-position isolating switch assembly according to claim 1, characterized in that: The horizontal distance b1 between the rotation center O1 of the knife blade (3) and the rotation center O2 of the swing arm (5) is 48 mm to 52 mm, and the vertical distance b2 between O1 and O2 is 33 mm to 37 mm.

7. The three-position isolating switch assembly according to claim 1, characterized in that: The straight-line distance b3 between the rotation center O1 of the gate knife (3) and the hinge center A of the gate knife (3) and the connecting rod (4) is 93.1 mm-97.1 mm.

8. The three-position isolating switch assembly according to claim 1, characterized in that: The straight-line distance b4 between the rotation center O2 of the swing arm (5) and the hinge center B of the swing arm (5) and the connecting rod (4) is 75 mm to 79 mm.

9. The three-position isolating switch assembly according to claim 1, characterized in that: The straight-line distance between the hinge center A of the knife blade (3) and the connecting rod (4) and the hinge center B of the swing arm (5) and the connecting rod (4) is 95.2 mm to 99.2 mm.

10. The three-position isolating switch assembly according to claim 1, characterized in that: The hinge center A between the connecting rod (4) and the gate knife (3) is arranged on the center line of the gate knife (3).

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