CN117790229A - Rotary isolating switch - Google Patents

Abstract

The invention discloses a rotary isolating switch, which comprises: an operating mechanism, and a lamination unit. The lamination unit comprises a fixed contact, a moving contact, a permanent magnet, an outer ring arc-extinguishing grid sheet and an arc-extinguishing chamber. The moving contact is provided with an inner ring arc extinguishing grid sheet and a corresponding insulation structure. The scheme has compact structure and reasonable arrangement of the internal space, can jointly generate an arc extinguishing effect with the arc extinguishing chamber under the direct current use condition, and can weaken faults and burning loss caused by incapability of extinguishing arc under the condition of misloading of the north and south poles of the permanent magnet.

Description

Rotary isolating switch

Technical Field

The invention relates to the technical field of electrical equipment, in particular to a rotary isolating switch.

Background

Current types of stacked rotary disconnector products incorporate arc extinguishing devices and arc extinguishing features for improving product performance. For the case of using direct current, a permanent magnet is added to change the direction of the arc and thus lengthen the stretch-break arc. Aiming at the condition of using alternating current, an arc extinguishing grid plate is added for arc extinguishing. Because this type of product requires compact structure, it has great difficulty to arrange permanent magnet and arc extinguishing bars simultaneously, if want to give attention to reasonable efficient arc extinguishing chamber and exhaust passage, the degree of difficulty is bigger.

Therefore, most products specify the direct current use case, specify the positive and negative electrode wiring, i.e., the current direction, and specify the north and south pole mounting orientation of the permanent magnets. Once the product is reversely connected in the positive and negative directions of the in-and-out line in use or the north and south poles of the permanent magnet are wrongly arranged in the production and assembly process, faults and burning loss are easily caused by the fact that effective arc extinction cannot be realized. Few products are provided with the permanent magnets and the arc-extinguishing grid plates at the same time, but the space arrangement scheme is poor, so that a good arc-extinguishing effect cannot be achieved.

Disclosure of Invention

In view of the above, the invention provides a rotary isolating switch with good arc extinguishing performance.

In order to achieve the above purpose, the present invention provides the following technical solutions:

a rotary isolation switch, comprising: stacking modules;

the laminated module includes: a first lamination unit and a second lamination unit which are alternately laminated;

the first lamination unit includes: the first shell and the first outer ring arc extinguishing grid sheet; the first outer ring arc-extinguishing grid sheet is arranged on the first surface of the first shell, a moving contact cavity for installing a moving contact is arranged in the center of the first shell, and the first outer ring arc-extinguishing grid sheet is positioned on the periphery of the moving contact cavity;

the second lamination unit includes: a second housing; the second face of second casing with the first face of first casing corresponds and contacts the range upon range of, the second face of second casing with form arc extinguishing chamber and exhaust passage between the first face of first casing, first outer lane arc extinguishing bars piece is located in the arc extinguishing chamber, the arc extinguishing chamber is located the outward flange in moving contact chamber, one side of arc extinguishing chamber communicate in moving contact chamber, the opposite side communicate in exhaust passage's first end, exhaust passage's second end expose in first casing with the outward flange of second casing.

Optionally, the first lamination unit further includes: a moving contact and two first fixed contacts; the movable contact is arranged in the movable contact cavity and is respectively communicated with or separated from the two first fixed contacts.

Optionally, the number of the arc extinguishing chambers is two, the two arc extinguishing chambers are respectively located at two sides of the moving contact cavity, the two groups of the first outer ring arc extinguishing grid sheets are located at the two arc extinguishing chambers in one-to-one correspondence, and the first ends of the two exhaust channels are communicated with the two arc extinguishing chambers in one-to-one correspondence. Optionally, two connecting posts are respectively disposed on two opposite sides of the first housing, and the second end of the exhaust channel is located between the two connecting posts on the same side.

Optionally, the first lamination unit further includes: and the permanent magnet is arranged at the bottom of the moving contact cavity.

Optionally, the moving contact is rotatably disposed in the moving contact cavity, and the moving contact is turned on or separated from the first fixed contacts on two sides respectively.

The moving contact includes: the contact turntable and the inner ring arc extinguishing grid piece; the inner ring arc extinguishing grid piece is positioned at one side of the moving contact, which is contacted with the first fixed contact;

the two groups of inner ring arc extinguishing grid plates are respectively arranged at the two radial sides of the center shaft of the contact turntable, and the closed state is respectively aligned with the two ends of the exhaust channel.

Optionally, the moving contact further includes: the contact bridge is arranged at the center of the contact turntable;

the moving contact is provided with an arc-extinguishing grid sheet insulation structure positioned between the contact bridge and the inner ring arc-extinguishing grid sheet.

Optionally, the arc extinguishing gate sheet insulation structure includes: and a side wall axially arranged along the contact turntable.

Optionally, the contact turntable is provided with an arc-extinguishing grid plate clamping groove for installing the inner ring arc-extinguishing grid plate.

According to the technical scheme, the rotary isolating switch provided by the invention has the advantages that the structure is compact, the internal space is reasonably arranged, the permanent magnet and the arc-extinguishing chamber can jointly generate an arc-extinguishing effect under the direct current use condition, and faults and burning loss caused by incapability of extinguishing arc can be weakened under the condition that the north and south poles of the permanent magnet face to the wrong installation.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a rotary isolating switch according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an operating mechanism according to an embodiment of the present invention;

fig. 3.1 is a schematic diagram of a mating structure of a first stacking unit and a second stacking unit according to an embodiment of the present invention;

fig. 3.2 is a schematic structural diagram of the hidden moving contact in fig. 3.1;

fig. 3.3 is a schematic structural diagram of the arc extinguishing chamber 27 and the exhaust passage according to the embodiment of the present invention;

fig. 4.1 is a schematic diagram of an assembly structure of a moving contact according to an embodiment of the present invention;

fig. 4.2 is an exploded schematic view of a moving contact according to an embodiment of the present invention;

fig. 4.3 is a schematic cross-sectional structure of a moving contact according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of layer-by-layer transmission of each component according to an embodiment of the present invention;

fig. 6.1, fig. 6.2 and fig. 6.3 are schematic structural diagrams of different permanent magnet north and south pole installation orientations according to the embodiments of the present invention;

fig. 6.4 is a schematic diagram of a structure in which both break points draw arcs inward when the permanent magnet is assembled in a staggered manner according to the embodiment of the present invention;

fig. 6.5 is a schematic structural diagram of an arc extinguishing process according to the embodiment of the present invention.

Wherein, 1 is an operating mechanism, 11 is a knob handle, and 12 is a mechanism turntable;

2 is a first lamination unit, 21 is a first shell, 22 is a first fixed contact, 24 is a moving contact, 241 is a contact turntable, 2411 is an arc-extinguishing grid clamping groove, 2412 is an arc-extinguishing grid insulation structure, 2413 is a rotating shaft, 2414 is a groove, 242 is a contact bridge, 243 is an inner ring arc-extinguishing grid, 25 is a permanent magnet, 26 is a first outer ring arc-extinguishing grid, 27 is an arc-extinguishing chamber, and 28 is an exhaust channel;

2 'is a second lamination unit, 21' is a second housing, 22 'is a second stationary contact, and 26' is a second outer ring arc extinguishing grid.

Detailed Description

In view of the technical defects of the rotary switch in the prior art, the rotary switch is designed for AC/DC use, the current direction of the wire inlet and outlet ends is not required to be regulated, and the arc extinguishing performance is good.

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The rotary isolating switch provided by the embodiment of the invention comprises: stacking modules;

the laminated module includes: the first lamination units 2 and the second lamination units 2' alternately laminated, the structure of which can be shown with reference to fig. 1;

as shown in fig. 3.1 and 3.2, the first lamination unit 2 includes: a first case 21 and a first outer ring arc extinguishing grid 26; the first outer ring arc extinguishing grid sheet 26 is arranged on a first surface (upper surface in the figure) of the first shell 21, a moving contact cavity for installing the moving contact 24 is arranged in the center of the first shell 21, and the first outer ring arc extinguishing grid sheet 26 is positioned on the periphery of the moving contact cavity; optionally, the number of the first outer ring arc extinguishing grid plates 26 is multiple, and each first outer ring arc extinguishing grid plate 26 is provided with an arc striking groove towards the moving contact 24;

as shown in fig. 3.3, the second lamination unit 2' includes: a second housing 21'; the second surface (lower surface in the figure) of the second shell 21 'corresponds to and contacts and stacks with the first surface of the first shell 21, an arc extinguishing chamber 27 and an exhaust channel 28 are formed between the second surface of the second shell 21' and the first surface of the first shell 21, the arc extinguishing grid sheet 26 of the first outer ring is positioned in the arc extinguishing chamber 27, and the arc extinguishing chamber 27 is positioned at the outer edge of the moving contact cavity; one side of the arc extinguishing chamber 27 is communicated with the moving contact cavity of the first shell 21, and the other side is communicated with the first end of the exhaust channel 28; the second ends of the exhaust passages 28 are exposed to the outer edges of the first and second cases 21 and 21', thereby achieving a conductive exterior of the laminated module.

The working principle is as follows: the high-temperature gas and particles generated by the arc are discharged along the exhaust passage 28 through the arc extinguishing chamber 27 formed in the lamination direction (the height direction as shown in fig. 3.3); as in the case of ac use, the arc generated at both break points moves towards the outer ring arc chute 26, see fig. 6.5.

According to the technical scheme, the rotary isolating switch provided by the embodiment of the invention is provided with the outer ring arc extinguishing grid plates 26, the arc extinguishing chambers 27 and the exhaust channels 28, so that efficient arc extinguishing can be realized, and the structure is compact and the internal space is reasonable in arrangement.

Further, as shown in fig. 3.1, the moving contact 24 rotates to be respectively connected to or separated from the first fixed contacts 22 at two sides, so that the corresponding embodiment includes two arc extinguishing chambers 27, the two arc extinguishing chambers 27 are respectively located at two sides of the moving contact chamber, the two groups of arc extinguishing grid plates 26 of the first outer ring are located in the two arc extinguishing chambers 27 in a one-to-one correspondence manner, and the first ends of the two exhaust channels 28 are communicated with the two arc extinguishing chambers 27 in a one-to-one correspondence manner, and the structure can be shown in fig. 3.3;

two connecting posts are respectively arranged on two opposite sides of the first shell 21, and the second end of the exhaust channel 28 is positioned between the two connecting posts on the same side. The structure of the arc extinguishing device can be shown with reference to fig. 3.2 and 3.3, namely, the connecting columns on two sides of the first shell 21 avoid the exhaust channel 28, in this embodiment, the second end side surface of the exhaust channel 28 is surrounded by a side wall 281 arranged along the axial direction, and the width of the side wall 281 is greater than the total arc width of a plurality of arc extinguishing grid plates 26 of the first outer ring along the circumferential arrangement direction, so as to facilitate exhaust.

As shown in connection with fig. 3.2, the first lamination unit 2 further comprises: and the permanent magnet 25 is arranged at the bottom of the moving contact cavity. The rotary switch is from the closed state to the open state, the movable contact 24 rotates anticlockwise to be separated from the fixed contact 22, and the electric arcs generated at two break points on each laminated unit move towards the outer ring arc-extinguishing grid plate 26 under the action of the permanent magnet 25 and high-temperature gas, so that the electric arcs are rapidly broken and extinguished, and fig. 6.3 is realized. The permanent magnet and the arc-extinguishing grid plates are arranged simultaneously, and the permanent magnet 25 and the arc-extinguishing chamber 27 can jointly generate good arc-extinguishing effect under the direct current use condition.

Preferably, the first lamination unit 2 further includes: the movable contact 24 arranged in the movable contact cavity can be structurally shown by referring to fig. 3.1, and the movable contact 24 is respectively connected with or separated from the first fixed contacts 22 at two sides in a rotating way;

the moving contact 24 includes: the contact turntable 241 and the inner ring arc extinguishing grid sheet 243 can be shown in fig. 4.1, 4.2 and 4.3, and the inner ring arc extinguishing grid sheet 243 is positioned at the contact side of the moving contact 24 and the first fixed contact 22;

the two groups of inner ring arc extinguishing grid plates 243 are respectively arranged on the two radial sides of the central shaft of the contact turntable 241, and the closed state is respectively aligned with the two ends of the exhaust channel 28. An arc striking groove is formed in one side (the outer side in the drawing) of each inner ring arc extinguishing gate sheet 243 facing away from the moving contact 24. When the permanent magnet 25 is wrongly installed to cause that both sides of the break point are drawn to arc inwards, the arc extinguishing effect of the inner ring arc extinguishing grid sheet 243 can be further improved, and the arc burning loss is reduced, as shown in fig. 6.4.

Further, the moving contact 24 further includes: a contact bridge 242 disposed at the center of the contact turntable 241;

the structure of the movable contact 24 can be shown with reference to fig. 4.2 and 4.3, and the movable contact 24 is provided with an arc-extinguishing grid sheet insulation structure 2412 positioned between the contact bridge 242 and the inner ring arc-extinguishing grid sheet 243, so that the creepage path 244 needs to bypass the arc-extinguishing grid sheet insulation structure 2412, and the creepage path is increased, thereby ensuring that the arc is not generated between the contact bridge 242 and the inner ring arc-extinguishing grid sheet 243.

Specifically, the arc extinguishing gate sheet insulating structure 2412 includes: the side walls axially disposed along the contact turntable 241 may be configured as shown in fig. 4.2 and 4.3, so that the creepage path 244 of the moving contact 24 is serpentine, which needs to bypass the arc extinguishing grid insulation structure 2412.

Preferably, the contact turntable 241 is provided with arc chute card slots 2411 for mounting the inner ring arc chute 243 as a securing feature for ease of assembly maintenance.

The present solution is further described in connection with the following complete embodiments:

see fig. 1. A rotary switch includes an operating mechanism 1, a first lamination unit 2, and a second lamination unit 2'.

The operating mechanism 1 includes a knob handle 11 and a mechanism turntable 12. See fig. 2.

The first lamination unit 2 includes a first housing 21, a first stationary contact 22, a moving contact 24, a permanent magnet 25, and a first outer ring arc extinguishing grid 26.

See fig. 3.1, fig. 3.2. The second lamination unit 2 'includes a second housing 21', a second stationary contact 22', a moving contact 24, a permanent magnet 25, and a second outer ring arc extinguishing grid 26'.

See fig. 3.3. An arc extinguishing chamber 27 formed by the first casing 21 and the second casing 21 'between the first lamination unit 2 and the second lamination unit 2', and an exhaust passage 28.

See fig. 4.1, fig. 4.2, fig. 4.3. The moving contact 24 comprises a contact turntable 241, a contact bridge 242 and an inner ring arc extinguishing grid 243. The contact bridge 242 is installed in the contact turntable 241, and the inner ring arc extinguishing grid sheet 243 is circumferentially installed on the outer wall of the contact turntable 241.

The contact turntable 241 includes arc chute sheet clamping grooves 2411, arc chute sheet insulation structures 2412, rotating shafts 2413, and grooves 2414. Arc extinguishing gate clamping grooves 2411 and arc extinguishing gate insulating structures 2412 are respectively arranged on the contact turntable 241 along the circumferential direction; one side of the contact turntable 241 is provided with a rotating shaft 2413 and the other side is provided with a groove 2414.

Typically, knob handle 11 has two dwell regions of 0 ° and 90 °. Turning the knob handle 11 clockwise from 0 ° to 90 °, the corresponding switch being switched from the open state to the closed state; conversely, turning knob handle 11 counterclockwise from 90 ° to 0 ° and the corresponding switch transitions from the closed state to the open state. The operation mechanism 1 converts the motion of the knob handle 11 to the mechanism turntable 12, and then the motion is transmitted to the moving contact 24 connected with the mechanism turntable 12 from the lower part, and generally the rotation range and the rotation direction of the mechanism turntable 12 are consistent with those of the knob handle, and the internal structure and the working principle of the operation mechanism 1 are not described in detail herein. See fig. 2.

The moving contact 24 in the first stacking unit 2 closest to the operating mechanism 1 has its rotating shaft 2413 on the contact turntable 241 and is in connection engagement with a groove structure similar to the groove 2414 on the mechanism turntable 12, and the moving contact 24 in each stacking unit 2 or 2' is in connection engagement with the moving contact 24 of the upper and lower layers through its rotating shaft 2413 and groove 2414 and rotates together with the mechanism turntable 12.

The arc extinguishing system comprises a first lamination unit 2, a permanent magnet 25 on the first lamination unit 2, an outer ring arc extinguishing grid 26 and an inner ring arc extinguishing grid 243 on a moving contact 24. The arc extinguishing system further comprises arc extinguishing features (such as arc extinguishing grid sheet insulating structure 2412), arc extinguishing chambers 27 formed by adjacent housings 21 and housings 21' in height direction and corresponding exhaust passages 28, see fig. 3.1, 3.2, 3.3, 4.1.

The inner ring arc extinguishing grid 243 is mounted on the moving contact 24, and besides the fixed characteristic arc extinguishing grid clamping groove 2411, an arc extinguishing grid insulation structure 2412 is also required, so that the arc movement path 244 is long enough to ensure that an arc is not generated between the contact bridge 242 and the inner ring arc extinguishing grid 243. See fig. 4.2, fig. 4.3.

The rotary switch is from the closed state to the open state, the movable contact 24 rotates anticlockwise to be separated from the fixed contact 22, and the electric arcs generated at two break points on each laminated unit move towards the outer ring arc-extinguishing grid 26 or the inner ring arc-extinguishing grid 243 under the action of the permanent magnet 25 and high-temperature gas, so that the electric arcs are rapidly broken and extinguished. The different installation orientations of the north and south poles of the permanent magnets are shown in fig. 6.1, fig. 6.2 and fig. 6.3 corresponding to the arc extinction condition. In the case where positive and negative connections, i.e. current direction, can be specified, the north and south mounting orientation of the permanent magnets 25 in fig. 6.3 should be the best option, with the arc direction of the break points on both sides being outward, pointing toward the outer ring arc chute 26. Because the space of the rotation center is limited, the arc extinguishing effect of the inner ring arc extinguishing grid plate 243 is not as good as that of the outer ring arc extinguishing grid plate 26, but when the break points at the two sides are drawn inwards due to the misloading of the permanent magnets 25, the arc burning loss can be reduced, as shown in fig. 6.4.

The high temperature gases and particles generated by the arc are discharged along a discharge channel 28 through an arc extinguishing chamber 27 in the height direction, see fig. 3.3; in the case of alternating current use, the permanent magnets 25 are not active, the arc generated at both break points moves towards the outer ring arc extinguishing grid 26, and the rest of the arc extinguishing process is identical to the direct current, see fig. 6.5. Therefore, the arc extinguishing system can be used universally no matter the alternating current or the direct current.

In summary, the present disclosure relates to a rotary isolating switch, and more particularly to a laminated ac/dc rotary isolating switch with an arc extinguishing system. It comprises the following steps: an operating mechanism, and a lamination unit. The lamination unit comprises a fixed contact, a moving contact, a permanent magnet, an outer ring arc-extinguishing grid sheet and an arc-extinguishing chamber. The moving contact is provided with an inner ring arc extinguishing grid sheet and a corresponding insulation structure. The scheme has compact structure and reasonable arrangement of the internal space, can jointly generate an arc extinguishing effect with the arc extinguishing chamber under the direct current use condition, and can weaken faults and burning loss caused by incapability of extinguishing arc under the condition of misloading of the north and south poles of the permanent magnet.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A rotary isolation switch, comprising: stacking modules;

the laminated module includes: a first lamination unit (2) and a second lamination unit (2') which are alternately laminated;

the first lamination unit (2) includes: a first housing (21) and a first outer ring arc extinguishing grid sheet (26); the first outer ring arc-extinguishing grid sheet (26) is arranged on the first surface of the first shell (21), a moving contact cavity for installing a moving contact (24) is arranged in the center of the first shell (21), and the first outer ring arc-extinguishing grid sheet (26) is positioned on the periphery of the moving contact cavity;

the second lamination unit (2') includes: a second housing (21'); the second surface of the second shell (21 ') corresponds to and contacts and stacks with the first surface of the first shell (21), an arc extinguishing chamber (27) and an exhaust channel (28) are formed between the second surface of the second shell (21') and the first surface of the first shell (21), the first outer ring arc extinguishing grid sheet (26) is positioned in the arc extinguishing chamber (27), the arc extinguishing chamber (27) is positioned at the outer edge of the moving contact chamber, one side of the arc extinguishing chamber (27) is communicated with the moving contact chamber, and the other side of the arc extinguishing chamber is communicated with the first end of the exhaust channel (28); the second end of the exhaust passage (28) is exposed to the outer edges of the first housing (21) and the second housing (21').

2. The rotary isolating switch according to claim 1, characterized in that the first lamination unit (2) further comprises: a moving contact (24) and two first fixed contacts (22); the movable contact (24) is arranged in the movable contact cavity and is respectively communicated with or separated from the two first fixed contacts (22).

3. The rotary isolating switch according to claim 2, wherein the number of the arc extinguishing chambers (27) is two, the two arc extinguishing chambers (27) are respectively located at two sides of the moving contact cavity, the two groups of the first outer ring arc extinguishing grid plates (26) are located at the two arc extinguishing chambers (27) in a one-to-one correspondence manner, and the first ends of the two exhaust channels (28) are communicated with the two arc extinguishing chambers (27) in a one-to-one correspondence manner.

4. A rotary disconnector according to claim 3, in which two connection posts are provided on opposite sides of the first housing (21), the second end of the exhaust channel (28) being located between two of the connection posts on the same side.

5. The rotary isolating switch according to claim 1, characterized in that the first lamination unit (2) further comprises: and the permanent magnet (25) is arranged at the bottom of the moving contact cavity.

6. The rotary isolating switch according to claim 2, wherein the moving contact (24) is rotatably arranged in the moving contact cavity, and the moving contact (24) is respectively connected with or separated from the first fixed contacts (22) on two sides in a rotating way.

7. The rotary isolating switch according to claim 6, wherein the moving contact (24) comprises: a contact turntable (241) and an inner ring arc extinguishing grid sheet (243); the inner ring arc extinguishing grid sheet (243) is positioned at one side of the movable contact (24) contacted with the first fixed contact (22);

the two groups of inner ring arc extinguishing grid plates (243) are respectively arranged at two radial sides of the central shaft of the contact turntable (241), and the closed state is respectively aligned with two ends of the exhaust channel (28).

8. The rotary isolation switch of claim 7, wherein the moving contact (24) further comprises: a contact bridge (242) arranged in the center of the contact turntable (241);

the moving contact (24) is provided with an arc extinguishing grid sheet insulation structure (2412) positioned between the contact bridge (242) and the inner ring arc extinguishing grid sheet (243).

9. The rotary isolation switch of claim 8, wherein the arc chute sheet insulation structure (2412) comprises: a side wall axially disposed along the contact turret (241).

10. The rotary disconnecting switch according to claim 7, characterized in that the contact turntable (241) is provided with arc chute card slots (2411) for mounting the inner ring arc chute (243).