A rotating switch moving contact assembly for physically isolating electric arcs

Abstract

The present invention belongs to the technical field of rotary switches, and specifically relates to a rotary switch moving contact assembly for physically isolating an arc, comprising a moving contact rotating frame, a moving contact arranged on the moving contact rotating frame and cooperating with the moving contact rotating frame, comprising a moving contact rotating frame, a moving contact arranged on the moving contact rotating frame and cooperating with the moving contact rotating frame, the moving contact rotating frame is provided with a physical isolation structure for disconnecting the arc, the physical isolation structure comprises at least one group of insulating clamps, one group of insulating clamps is composed of two insulating clamps arranged oppositely and at least partially insulated; the two insulating clamps arranged oppositely have a first state in which they are separated to form a gap between the two for the static contact to rotate, and a second state in which they are combined to isolate and disconnect the arc. The present invention innovatively proposes a method of physically isolating the arc by isolating the arc between the moving contact and the static contact through the insulating clamp in the rotary switch, which significantly improves the arc extinguishing effect compared with the existing arc extinguishing method.

Description

Technical Field

[0001] The present invention belongs to the technical field of rotary switches, and particularly relates to a moving contact assembly of a rotary switch for physically isolating arcs. Background Art

[0002] In the existing rotary disconnect switches, they are usually stacked by several switch units. Each switch unit includes a housing, a moving contact, a static contact, and a moving contact rotating frame. The moving contact is installed on the moving contact rotating frame, the moving contact rotating frame is rotatably arranged in the housing, the static contact is fixed in the housing and located on the rotation trajectory of the moving contact. When the moving contact rotating frame rotates, the moving contact is connected or disconnected from the static contact, forming the closing and opening of the circuit.

[0003] An arc is a gas discharge phenomenon, an instantaneous spark generated when an electric current passes through some insulating media (such as air). When the switch contacts are separated, the distance between the contacts is very small and the electric field strength E is very high. Therefore, an arc will be generated when the moving contact and the static contact are disconnected. The arc will not only have a great destructive effect on the contacts, but also extend the time for disconnecting the circuit. Moreover, the high temperature formed by the arc may burn the contacts and insulation. In severe cases, it may even cause phase-to-phase short circuit and electrical explosion, thus causing a fire and endangering the safety of personnel and equipment. Therefore, setting an arc extinguishing mechanism in the disconnect switch is an important setting to ensure the use safety.

[0004] In the field of switch technology, the current conventional arc extinguishing methods include: stretching the arc, metal grid arc extinguishing chamber, air-blowing arc extinguishing device, folding vacuum arc extinguishing device, etc. Currently, the conventional way to extinguish the arc in a rotary disconnect switch is to set an arc extinguishing chamber, but the arc extinguishing effect is not good. The applicant has previously applied for a number of arc extinguishing structures for rotary disconnect switches. Among them, the method of setting a permanent magnet and using the magnetic field formed by the permanent magnet to draw the arc for arc extinguishing disclosed in the patent 201820047807.4 is adopted. It is found that due to the limitation of the setting position of the permanent magnet, the arc extinguishing effect is limited; in the patent CN202020221756.X, by setting an arc extinguishing chamber and a permanent magnet to introduce the arc into the arc extinguishing chamber, compared with the patent 201820047807.4, its arc extinguishing effect is significantly improved, but the structure is complex. Summary of the Invention

[0005] The purpose of the present invention is to overcome the drawbacks and deficiencies existing in the prior art, and provide a moving contact assembly of a rotary switch for physically isolating arcs.

[0006] The technical solution adopted by the present invention is as follows: A rotating switch moving contact assembly for physically isolating an arc, comprising a moving contact rotating frame, a moving contact arranged on the moving contact rotating frame and cooperating with the moving contact rotating frame, the moving contact rotating frame being provided with a moving area for allowing a static contact to rotate relative to the moving contact between a closed and open state, the moving contact rotating frame being provided with a physical isolation structure for disconnecting the arc, the physical isolation structure comprising at least one group of insulating clamps, one group of insulating clamps being composed of two insulating clamps arranged opposite to each other and at least partially insulated; and at least one group of insulating clamps being located in the moving area, the two insulating clamps arranged opposite to each other having a first state in which they are separated to form a gap for the static contact to rotate through, and a second state in which they are combined to isolate and disconnect the arc.

[0007] The physical partition structure is at least partially elastic so that the two oppositely arranged insulating clamps are separated when the static contact rotates and reset to a closed state under the action of its own elasticity. The insulating clamp is provided with an action guide surface for interacting with the static contact to separate the two oppositely arranged insulating clamps.

[0008] The physical isolation structure comprises a spring sheet body, the spring sheet body is provided with a first elastic action portion, and the insulating clamp is fixed on the first elastic action portion.

[0009] The insulating clamp is directly formed by integral injection molding of insulating material outside the first elastic action portion.

[0010] The physical isolation structure comprises two spring sheet bodies respectively located at two sides of the moving contact and cooperating with the moving contact rotating frame, and two insulating clamps belonging to the same group of insulating clamps are respectively arranged on the two spring sheet bodies.

[0011] The moving contact comprises at least one group of moving contact pieces arranged in pairs, and a matching gap is formed between the moving contact pieces arranged in pairs for the stationary contact to be inserted; the two spring sheet bodies respectively located on both sides of the moving contact are respectively provided with a second elastic action part for forming an elastic force on the moving contact piece, and the moving contact pieces arranged in pairs have a closed state in which they are stretched open by the stationary contact and an open state in which they are elastically restored after being separated from the stationary contact.

[0012] The insulating clamps are arranged adjacent to the moving contact pieces, so that when a group of moving contact pieces arranged in pairs are in a closed state opened by the stationary contact pieces, the two relatively arranged insulating clamps are separated to form a first state where a gap is formed between them for the stationary contact pieces to rotate through.

[0013] The moving contact is composed of two contact pieces stacked up and down and connected by riveting. The contact piece has at least one moving contact piece, and the two contact pieces stacked up and down form at least one group of moving contact pieces arranged in pairs, and a matching gap is formed between the moving contact pieces arranged in pairs for the static contact to be inserted.

[0014] The two contact pieces forming the moving contact are connected by a connecting piece, and riveting pieces for riveting the other contact piece are provided on the outer periphery of one contact piece or both contact pieces; the two contact pieces, the connecting piece, and the riveting pieces are integrally formed, and the moving contact is formed by bending the two contact pieces at the connecting piece and then stacking them up and down and connecting them by riveting.

[0015] The insulating chuck is arranged adjacent to the moving contact piece.

[0016] The beneficial effects of the present invention are as follows: When the arc generated during the breaking of the moving contact and the static contact forms an arc between the moving contact and the static contact as the moving contact rotates, the present invention innovatively proposes a physical arc interruption method for isolating the arc between the moving contact and the static contact through an insulating chuck in a rotary switch. The principle of achieving arc extinguishing is completely different from that of the existing conventional arc extinguishing methods. However, during the actual test process, it is found that for the rotary disconnector adopting the physical interruption structure of the present invention, its arc extinguishing effect is significantly improved compared with that of multiple patents previously applied by the applicant. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, obtaining other drawings based on these drawings still belongs to the scope of the present invention.

[0018] Figure 1 It is a schematic structural diagram of a moving contact assembly in an embodiment of the present invention;

[0019] Figure 2 It is an exploded view of a moving contact assembly in an embodiment of the present invention;

[0020] Figure 3 It is a schematic structural diagram of a shrapnel body in an embodiment of the present invention;

[0021] Figure 4 It is a schematic structural diagram of an insulating chuck in an embodiment of the present invention;

[0022] Figure 5 It is a schematic structural diagram of a moving contact in an embodiment of the present invention;

[0023] Figure 6 It is an unfolded schematic structural diagram of a moving contact in an embodiment of the present invention;

[0024] Figure 7 It is a schematic position structure diagram of a moving contact assembly and a static contact in a breaking state in an embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of the position structure of a moving contact assembly and a stationary contact in a state close to the closed state according to an embodiment of the present invention;

[0026] Figure 9 This is a schematic diagram of the position structure of a moving contact assembly and a stationary contact in a closed state according to an embodiment of the present invention, in which the moving contact piece structure has been hidden;

[0027] In the figure, 1, moving contact rotating frame; 101, moving area; 102, linkage column; 2, moving contact; 201, moving contact piece; 202, connecting piece; 203, riveting piece; 3, insulating clamp; 301, plug hole; 302, action guide surface; 4, spring sheet body; 401, first elastic action part; 402, second elastic action part; 5, static contact; 6, shell cover. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0030] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are for explaining and understanding the present invention, but not for limiting the scope of protection of the present invention.

[0031] The present invention provides a rotary switch moving contact assembly for physically isolating an arc, comprising a moving contact rotating frame 1, a moving contact 2 arranged on the moving contact rotating frame 1 and cooperating with the moving contact rotating frame 1, and a shell cover 6. The moving contact rotating frame 1 is provided with a square linkage column 102, and the moving contact 2 is sleeved outside the linkage column 102 and rotates with the rotation of the moving contact rotating frame 1. The moving contact rotating frame 1 is provided with a moving area 101 for the static contact 5 to rotate between the closed and open states relative to the moving contact. In the rotary isolating switch, the moving contact assembly rotates, and the static contact does not move. During the rotation of the moving contact assembly, the position of the static contact relative to the moving contact changes.

[0032] The moving contact rotating frame 1 is provided with a physical partition structure for disconnecting the arc. The physical partition structure includes at least one set of insulating chucks 3. One set of insulating chucks 3 is composed of two oppositely arranged insulating chucks 3 that are at least partially insulating. And at least one set of insulating chucks 3 is located in the moving area 101. The two oppositely arranged insulating chucks 3 have a first state in which they are separated from each other to form a gap for the static contact 5 to turn through, and a second state in which they are combined to cut off and disconnect the arc.

[0033] Furthermore, at least part of the physical partition structure has elasticity, so that the two oppositely arranged insulating chucks 3 are separated when the static contact 5 turns through, and reset to the combined state under the action of its own elasticity. The insulating chuck 3 is provided with an action guiding surface 302 for interacting with the static contact 5 to separate the two oppositely arranged insulating chucks 3. When the static contact 5 rotates through, the static contact 5 overcomes the elastic action of the physical partition structure and squeezes open to separate the two insulating chucks 3. After the static contact 5 rotates through, it resets to the combined state under the action of its own elasticity, directly cutting off the arc between the static contact 5 and the moving contact. In this embodiment, the action guiding surface 302 is the smooth convex curved surface shown in the figure, and can also be a guiding inclined surface or other structures that can interact with the static contact to separate the two oppositely arranged insulating chucks 3.

[0034] Furthermore, the physical partition structure includes a spring sheet body 4, as Figure 3 shown. The spring sheet body 4 is provided with a first elastic action part 401, and the insulating chuck 3 is fixed on the first elastic action part 401.

[0035] As Figure 4 shown, the insulating chuck 3 is integrally injection molded directly outside the first elastic action part 401 by using an insulating material. Preferably, the spring sheet body 4 is a metal spring sheet, which has a long service life.

[0036] The physical partition structure includes two spring sheet bodies 4 that are respectively located on both sides of the moving contact 2 and are linked and matched with the moving contact rotating frame 1. The two insulating chucks 3 that are the same set of insulating chucks 3 are respectively arranged on the two spring sheet bodies 4. In this embodiment, the moving contact rotating frame 1 has a central linkage shaft, and a spring sheet body 4, a moving contact 2, and another spring sheet body 4 are sequentially sleeved outside the central linkage shaft, which is convenient for assembly.

[0037] As Figure 5As shown, the moving contact 2 includes at least one group of moving contact pieces 201 arranged in pairs, and a matching gap is formed between the moving contact pieces 201 arranged in pairs for the static contact 5 to be inserted. In some embodiments of the present invention, the two spring sheet bodies 4 respectively located on both sides of the moving contact 2 are respectively provided with second elastic action parts 402 for forming elastic force on the moving contact pieces 201, and the moving contact pieces 201 arranged in pairs have a closed state in which they are stretched open by the static contact 5 and an open state in which they are elastically reset after being separated from the static contact 5, that is, the second elastic action parts 402 of the spring sheet body 4 form an extrusion pressure on the moving contact piece 201, so that the moving contact piece 201 and the static contact 5 remain engaged when closed. In addition, the moving contact 2 itself may have some elasticity or may not have elasticity and completely rely on the action of the spring sheet body 4.

[0038] Further, such as Figure 3 As shown, the first elastic acting part 401 is arranged close to the second elastic acting part 402 so that the insulating clamp 3 is arranged adjacent to the moving contact piece 201, so that when a group of moving contact pieces 201 arranged in pairs are in a closed state stretched open by the stationary contact 5, the two relatively arranged insulating clamps 3 are in a first state of separation so that a gap is formed between the two for the stationary contact 5 to rotate through. That is, when the stationary contact 5 and the moving contact are released from the closure, the two relatively arranged insulating clamps 3 are in a phase separation state, and after disconnection, the stationary contact 5 is directly rotated out along the gap between the two relatively arranged insulating clamps 3, so that no obvious resistance is formed to the rotation of the moving contact assembly during the disconnection process.

[0039] like Figure 5 As shown, the moving contact 2 is composed of two contact pieces stacked up and down and connected by riveting. The contact piece has at least one moving contact piece 201, and the two contact pieces are stacked up and down to form at least one group of moving contact pieces 201 arranged in pairs, and a matching gap is formed between the group of moving contact pieces 201 arranged in pairs for the static contact 5 to be inserted.

[0040] like Figure 6 As shown, the two contact pieces constituting the moving contact 2 are connected via a connecting piece 202, wherein a rivet piece 203 for riveting the other contact piece is provided on the outer periphery of one or both contact pieces; the moving contact 2 is constituted by two contact pieces which are bent at the connecting piece 202, overlapped up and down, and connected by riveting.

[0041] In this embodiment, the insulating clamp 3 is disposed adjacent to the moving contact piece 201. The insulating clamp 3 and the moving contact piece 201 may also be spaced a certain distance apart. In actual tests, the shorter the distance between the insulating clamp 3 and the moving contact piece 201, the better the arc extinguishing effect.

[0042] The action process of this embodiment cooperating with the static contact 5 is as follows: Figure 7As shown, in the open state, there is a certain distance between the moving contact 2 and the static contact 5. The insulating chuck 3 is located between the moving contact 2 and the static contact 5. The insulating chuck 3 is in the lower mating position of the spring piece body 4. Rotate the moving contact assembly to move the moving contact 2 in the direction close to the static contact 5. After the static contact 5 contacts the insulating chuck 3, the static contact 5 interacts with the acting guiding surface 302 to separate the two relatively arranged insulating chucks 3, as Figure 8 shown, continue to move to Figure 9 the position, enter the mating gap of the moving contact piece 201, and form a closed state by connecting with the moving contact.

[0043] From closing to opening, the moving contact assembly moves in the reverse direction. After moving away from the insulating chuck 3, the insulating chuck 3 is reset to the Figure 7 mating position shown under the elastic reset action of the spring piece body 4, cutting off the arc between the moving contact and the static contact, achieving the purpose of arc extinguishing.

[0044] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A rotary switch moving contact assembly for physically isolating an arc, comprising a moving contact rotating frame (1), a moving contact (2) arranged on the moving contact rotating frame (1) and cooperating with the moving contact rotating frame (1), wherein the moving contact rotating frame (1) is provided with a moving area (101) for allowing a stationary contact (5) to rotate relative to the moving contact between a closed state and an open state, and characterized in that: The movable contact rotating frame (1) is provided with a physical isolation structure for disconnecting an arc, the physical isolation structure comprising at least one group of insulating clamps (3), wherein one group of insulating clamps (3) is composed of two insulating clamps (3) arranged opposite to each other and at least partially insulated; and at least one group of insulating clamps (3) is located in the moving area (101), and the two insulating clamps (3) arranged opposite to each other have a first state in which they are separated to form a gap for the stationary contact (5) to rotate therethrough, and a second state in which they are combined to disconnect the arc; The physical separation structure is at least partially elastic so that the two insulating clamps (3) arranged opposite to each other are separated when the stationary contact (5) rotates and are reset to a closed state under the action of its own elasticity. The insulating clamp (3) is provided with an action guide surface (302) for interacting with the stationary contact (5) to separate the two insulating clamps (3) arranged opposite to each other. The physical isolation structure comprises a spring sheet body (4), the spring sheet body (4) is provided with a first elastic action portion (401), and the insulating clamp (3) is fixed on the first elastic action portion (401); The physical partition structure comprises two spring sheet bodies (4) respectively located on both sides of the moving contact (2) and cooperating with the moving contact rotating frame (1); the spring sheet bodies (4) are metal spring sheets.

2. The rotating switch moving contact assembly for physically isolating an electric arc according to claim 1, wherein: The insulating clamp (3) is directly formed by integral injection molding of insulating material outside the first elastic action portion (401).

3. The rotating switch moving contact assembly for physically isolating an electric arc according to claim 1, wherein: Two insulating clamps (3) belonging to the same set of insulating clamps (3) are respectively arranged on two spring sheet bodies (4).

4. The rotating switch moving contact assembly for physically isolating an electric arc according to claim 3, wherein: The moving contact (2) comprises at least one group of moving contact pieces (201) arranged in pairs, wherein a matching gap is formed between the moving contact pieces (201) arranged in pairs into which a stationary contact (5) can be inserted; the two spring sheet bodies (4) respectively located on both sides of the moving contact (2) are respectively provided with a second elastic action part (402) for forming an elastic force on the moving contact piece (201), and the moving contact pieces (201) arranged in pairs have a closed state in which they are stretched open by the stationary contact (5) and an open state in which they are elastically reset after being separated from the stationary contact (5).

5. The rotating switch moving contact assembly for physically isolating an electric arc according to claim 4, characterized in that: The insulating clamps (3) are arranged adjacent to the moving contact pieces (201), so that when a group of moving contact pieces (201) arranged in pairs are in a closed state opened by the stationary contact (5), the two insulating clamps (3) arranged opposite to each other are in a first state in which they are separated to form a gap therebetween for the stationary contact (5) to rotate through.

6. The rotating switch moving contact assembly for physically isolating an electric arc according to claim 4, wherein: The moving contact (2) is formed by two contact pieces stacked up and down and connected by riveting, the contact piece has at least one moving contact piece (201), and the two contact pieces stacked up and down form at least one group of moving contact pieces (201) arranged in pairs, and a matching gap is formed between the group of moving contact pieces (201) arranged in pairs for the stationary contact (5) to be inserted.

7. The rotating switch moving contact assembly for physically isolating an electric arc according to claim 6, wherein: The two contact pieces forming the moving contact (2) are connected by a connecting piece (202), and riveting pieces (203) for riveting the other contact piece are provided on the outer periphery of one contact piece or both contact pieces; the two contact pieces, the connecting piece (202), and the riveting pieces (203) are integrally formed, and the moving contact (2) is formed by bending the two contact pieces at the connecting piece (202), stacking them up and down, and connecting them by riveting.

8. The rotating switch moving contact assembly for physically isolating an electric arc according to any one of claims 1-4, 6-7, characterized in that: The insulating collet (3) is arranged adjacent to the moving contact piece (201).

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