CN111524744B - Arc extinguishing nozzle and load switch with same - Google Patents
Arc extinguishing nozzle and load switch with same Download PDFInfo
- Publication number
- CN111524744B CN111524744B CN202010459975.6A CN202010459975A CN111524744B CN 111524744 B CN111524744 B CN 111524744B CN 202010459975 A CN202010459975 A CN 202010459975A CN 111524744 B CN111524744 B CN 111524744B
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- Prior art keywords
- arc
- load switch
- rotary blade
- contact
- movable contact
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
- H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
- H01H1/42—Knife-and-clip contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/003—Earthing switches
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
- H01H33/886—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts by movement of rotating pistons
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
- H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
- H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
- H01H9/342—Venting arrangements for arc chutes
Landscapes
- Circuit Breakers (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention relates to an arc extinguishing nozzle and a load switch with the same. This arc extinguishing nozzle is used for rotatory pneumatics load switch, and this load switch includes the insulating casing that fills with the arc extinguishing gas and can be for the rotating vane of insulating casing pivot, and load switch can be in on-state and isolated state at least along with rotating vane's rotation, and the arc extinguishing nozzle includes: an opening portion configured as an opening formed extending on the rotary blade in a tangential direction of the rotary blade; and the arc limiting part is arranged on the inner surface and/or the outer surface of the rotating blade and is designed into a hollow shape which extends inwards and/or outwards along the tangential direction of the rotating blade for a certain length, and the arc limiting part is communicated with the opening part to form a nozzle channel, so that when the load switch is switched from a switch-on state to an isolation state, arc extinguishing gas compressed by the rotating blade in the insulating shell is sprayed out along the nozzle channel.
Description
Technical Field
The invention relates to the technical field of electrical equipment, in particular to an arc extinguishing nozzle and a load switch with the same.
Background
A load switch is a switching device for closing, carrying and breaking a current in normal conductive circuit conditions or in defined overload conditions, in which an arc extinguishing device is provided. For example, a rotary gas-pressure load switch generally includes an insulating housing filled with an arc extinguishing gas, and a rotary piston rotatably connected to the insulating housing and provided with an arc extinguishing port, wherein the rotary piston compresses the arc extinguishing gas in the insulating housing when rotating relative to the insulating housing, so that the compressed gas is ejected from the arc extinguishing port to extinguish an arc generated when the load switch is switched from an on state to an off state. The prior art arc-extinguishing port is usually simply designed as an opening formed by drilling or slotting on the rotary piston, and the length dimension of the arc-extinguishing port is determined by the thickness dimension of the rotary piston. However, the rotary piston is generally designed as a thin plate structure so that the length of the arc-extinguishing port is short, which has the problem that the flow velocity of the compressed arc-extinguishing gas after passing through the arc-extinguishing port is reduced sharply, and the arc may not be blown out, thereby affecting the normal operation of the load switch and the load equipment.
There is a need in the art for an arc extinguishing nozzle with good arc extinguishing effect and high reliability.
Disclosure of Invention
The present invention aims to provide an arc extinguishing spout which solves at least some of the problems mentioned above.
The invention also aims to provide a load switch applying the improved arc extinguishing nozzle.
According to an aspect of the present invention, there is provided an arc-quenching spout for a rotary gas-pressurized load switch, the load switch including an insulating housing filled with an arc-quenching gas and a rotary blade pivotable with respect to the insulating housing, the load switch being capable of at least an on-state and an off-state in accordance with rotation of the rotary blade, the arc-quenching spout including: an opening portion configured as an opening formed extending on the rotary blade in a tangential direction of the rotary blade; and the arc limiting part is arranged on the inner surface and/or the outer surface of the rotating blade and is designed into a hollow shape which extends inwards and/or outwards for a certain length along the tangential direction of the rotating blade, and the arc limiting part is communicated with the opening part to form a nozzle channel, so that when the load switch is switched from a switch-on state to an isolation state, arc extinguishing gas compressed by the rotating blade in the insulating shell is sprayed out along the nozzle channel.
Compared with the prior art, the arc extinguishing nozzle is communicated with the opening part through the arc limiting part to form the nozzle channel, so that the length of the nozzle channel is greatly prolonged in the limited space of the load switch, the load switch is switched from a switch-on state to an isolation state along with the movement of the rotating blade, and when cold arc extinguishing gas compressed by the rotating blade in the insulating shell is sprayed out along the nozzle channel, the flow speed of arc extinguishing gas flow passing through the nozzle channel is ensured within a certain length at least greater than the thickness of the rotating blade in the nozzle channel, and the arc extinguishing effect and the reliability of the arc extinguishing nozzle in the embodiment are improved. In addition, the arc extinguishing nozzle is simple in structure and easy to manufacture and produce.
Preferably, the opening portion is configured as a circumferentially closed opening formed to extend on the rotary blade in a tangential direction of the rotary blade.
Preferably, the opening portion is configured as an open-topped opening formed to extend on the rotary blade in a tangential direction of the rotary blade, and a tip end of the rotary blade abuts against an inner side wall of the insulation case so that the opening portion is configured in a circumferentially closed form.
Preferably, the arc restricting part is constructed in a hollow shape closed all around.
Preferably, the arc restricting part is constructed in a hollow shape with an open top side.
Preferably, the opening portion and the arc restricting portion are designed as a separate structure.
Preferably, the opening portion and the arc restricting portion are designed to be integrally formed.
According to another aspect of the present invention, there is also provided a load switch including the arc extinguishing nozzle, the load switch further including an upper stationary contact connected to the insulating housing and immovable relative to the insulating housing, and a movable contact connected to the rotating blade and capable of following the rotating blade to be electrically connected to or disconnected from the upper stationary contact, wherein the upper stationary contact is configured to move away from the movable contact and along the nozzle passage when the movable contact is switched from an electrically conductive engagement state to a separated state.
Compared with the prior art, when the moving contact is mechanically separated from the upper static contact, electric arcs are generated between the moving contact and the upper static contact, because the upper static contact is far away from the moving contact and moves along the nozzle channel, and the nozzle channel has a certain length, at least a part of arc columns of the electric arcs generated between the upper static contact and the moving contact are limited in the nozzle channel, and meanwhile, cold arc extinguishing gas in the insulating shell can be sprayed to the upper static contact along the nozzle channel at a high flow speed, so that the arc columns limited in the nozzle channel can be cooled and dissociated conveniently, and the electric arcs are blown out.
Preferably, the upper fixed contact is configured to extend along the spout passage from an outer side of the rotating blade to be in electrically conductive engagement with the movable contact.
Preferably, the upper stationary contact is configured to extend downwardly from an upper side of the rotary blade to be in electrically conductive engagement with the movable contact.
Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be apparent to those having ordinary skill in the art upon examination of the following, or may be learned from the practice of the invention.
Drawings
Embodiments of the invention will hereinafter be described in detail with reference to the drawings, wherein like reference numerals denote like or similar elements, and wherein:
fig. 1 and 2 are a perspective view and a side view, respectively, of a load switch of an arc extinguishing spout according to a first embodiment of the invention, wherein the load switch is in an on state;
FIG. 3 is a schematic view of an arc extinguishing nozzle and rotating vanes according to a first embodiment of the present invention;
FIG. 4 is an enlarged view of area A of FIG. 3;
fig. 5 and 6 are a perspective view and a side view, respectively, of a load switch of an arc extinguishing spout according to a first embodiment of the invention in an isolated state;
fig. 7 and 8 are a perspective view and a side view, respectively, of a load switch of an arc extinguishing spout according to a first embodiment of the present invention in a grounded state;
fig. 9 and 10 are a perspective view and a side view, respectively, of a load switch of an arc-extinguishing spout according to a second embodiment of the invention, in which the load switch is in the on-state;
FIG. 11 is a schematic view of an arc extinguishing nozzle and rotating vanes according to a second embodiment of the present invention;
FIG. 12 is an enlarged view of area B of FIG. 11;
fig. 13 and 14 are a perspective view and a side view, respectively, of a load switch of an arc extinguishing spout according to a second embodiment of the present invention in an isolated state;
fig. 15 and 16 are a perspective view and a side view, respectively, of a load switch of an arc extinguishing spout according to a second embodiment of the present invention in a grounded state.
Description of reference numerals:
1-a load switch; 11-an insulating housing; 111-a backplane; 112-arc cover plate; 113-rear sector side panel; 12-rotating blades; 13-moving contact; 14-upper fixed contact; 15-a ground contact; 16-an insulated main shaft; 17-a first chamber; 18-a second chamber; 19-a linker arm; 20-lower static contact; 10-an arc extinguishing spout; 101-an opening; 102-arc limiting part.
Detailed Description
Referring now to the drawings, a schematic representation of the disclosed apparatus of the present invention will be described in detail. Although the drawings are provided to present some embodiments of the invention, the drawings are not necessarily to scale of particular embodiments, and certain features may be exaggerated, removed, or partially sectioned to better illustrate and explain the present disclosure. The position of some components in the drawings can be adjusted according to actual requirements on the premise of not influencing the technical effect. The appearances of the phrase "in the drawings" or similar language in the specification are not necessarily referring to all drawings or examples.
Certain directional terms used hereinafter to describe the drawings, such as "inner", "outer", "above", "below", and other directional terms, will be understood to have their normal meaning and refer to those directions as they normally relate to when viewing the drawings. Unless otherwise indicated, the directional terms described herein are generally in accordance with conventional directions as understood by those skilled in the art.
The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.
As used herein, the terms "joined," "connected," and the like, are intended to encompass both components which are indirectly joined together through intervening layers (e.g., adhesives, welds, etc.) or intermediate members (e.g., connectors, transitions, etc.), and components which are directly joined together without any intervening layers (e.g., adhesives, welds, etc.) or intermediate members (e.g., connectors, transitions, etc.).
Fig. 1 to 16 show by way of example an inventive arc-extinguishing nozzle 10 and a rotary gas-operated load switch 1 with which it is used. The load switch 1 is generally used for breaking a load current or a certain overload current, and the arc extinguishing nozzle 10 is used for providing an injection path of an arc extinguishing gas in the load switch 1 so as to blow out an arc generated when the load switch 1 is switched from an on state to an off state. In the present embodiment, the load switch 1 may include an insulating housing 11, a rotating blade 12, a movable contact 13, an upper stationary contact 14, a ground contact 15, an insulating main shaft 16, and a lower stationary contact 20.
Specifically, the insulating housing 11 may include a bottom plate 111, front and rear sector-shaped side plates 113 oppositely disposed on the bottom plate 111, and an arc-shaped cover plate 112 connecting the bottom plate 111, the front and rear sector-shaped side plates 113, and the arc-shaped cover plate 112, wherein an inner space formed by the bottom plate 111, the front and rear sector-shaped side plates 113, and the arc-shaped cover plate 112 is filled with an arc-extinguishing gas, such as, but not limited to, sulfur hexafluoride, carbon dioxide, air, and other mixed arc-extinguishing media. The ends of the insulated spindle 16 may be mounted on the front and rear scalloped side plates 113 of the insulated housing 11 to engage an external actuator and be controlled to rotate relative to the insulated housing 11. The rotating blades 12 may be mounted on the insulated main shaft 16 and extend toward the arc cover plate 112 to abut the inside of the arc cover plate 112 to follow the movement of the insulated main shaft 16 relative to the insulated housing 11. The movable contact 13 may be connected to the insulated main shaft 16 and thus may be considered to be connected with the rotating blade 12 via the insulated main shaft 16. Therefore, when the insulation main shaft 16 is controlled by the external operating mechanism to rotate, the movable contact 13 and the rotating blade 12 are driven to synchronously rotate relative to the insulation shell 11. Furthermore, the upper stationary contact 14 is non-movably connected to the arc-shaped cover plate 112, and can be directly and fixedly connected to the arc-shaped cover plate 112 by a fastener such as a bolt connection, or can be indirectly and fixedly connected to other structures which are located outside the insulating housing 11 and have no relative movement with the insulating housing 11 and are indirectly fixedly connected with respect to the arc-shaped cover plate 112. The lower stationary contact 20 is rotatably connected to the movable contact 13 and extends through the insulating main shaft 16 and the bottom plate 111, so that the lower stationary contact 20 does not follow the insulating main shaft 16 and is fixed relative to the insulating housing 11. The ground contact 15 may be fixedly disposed relative to the arcuate cover plate 112 and pass through a sidewall of the arcuate cover plate 112 into the interior of the insulative housing 11. It is understood that the connection between the lower stationary contact 20 and the bottom plate 111 and the connection between the grounding contact 15 and the arc-shaped cover plate 112 may be similar to the connection between the upper stationary contact 14 and the arc-shaped cover plate 112.
In practical use, under the control of the external operating mechanism, the insulating main shaft 16 is controlled to move, so as to drive the rotating blade 12 and the moving contact 13 to rotate relative to the insulating housing 11, that is, relative to the upper fixed contact 14 and the grounding contact 15, so that the moving contact 13 can be sequentially switched between an on state in which the moving contact is conductively engaged with the upper fixed contact 14 as shown in fig. 1 and 2 or 9 and 10, an isolated state in which the moving contact is separated from both the upper fixed contact 14 and the grounding contact 15 as shown in fig. 5 and 6 or 13 and 14, and a grounding state in which the moving contact is conductively engaged with the grounding contact 15 as shown in fig. 7 and 8 or 15 and 16, and vice versa. It is understood that the insulating housing 11, the rotating blade 12, the movable contact 13, the upper stationary contact 14, the grounding contact 15, the operating mechanism, the insulating main shaft 16 and the lower stationary contact 20 may be formed of the same material as that of the rotary pneumatic load switch in the prior art, and will not be described in detail herein.
When the movable contact 13 and the upper fixed contact 14 are switched from a conductive connection state to a separation state, under the action of a high electric field, after the movable contact 13 and the upper fixed contact 14 are mechanically separated, an electric arc is generated between the movable contact 13 and the upper fixed contact 14 by a medium around the movable contact 13 and the upper fixed contact 14 due to ionization, thermal dissociation, collision dissociation and the like, so that a current path is formed between the movable contact 13 and the upper fixed contact 14, and the movable contact 13 and the upper fixed contact 14 cannot be separated.
For this purpose, the closed insulating housing 11 can be filled with quenching gas and is divided by an insulating spindle 16 and a rotating blade 12, which are mounted pivotably on the insulating housing 11, into a first chamber 17 and a second chamber 18 of variable volume. Herein, the side of the rotary blade 12 facing the inside of the insulating housing 11 is referred to as an inner side herein, the first chamber 17 is a chamber toward which the inner side of the rotary blade 12 faces, and the second chamber 18 is a chamber toward which the outer side of the rotary blade 12 faces. When the insulating main shaft 16 drives the rotating blade 12 and the moving contact 13 to rotate relative to the insulating housing 11, so that the moving contact 13 and the upper stationary contact 14 are switched from a conductive connection state to a separation state, the volume of the first chamber 17 is reduced to compress the arc extinguishing gas in the first chamber 17, and the compressed arc extinguishing gas is ejected to the upper stationary contact 14 far away from the moving contact 13 through the arc extinguishing nozzle 10 on the rotating blade 12 and enters the second chamber 18 to blow off an electric arc between the moving contact 13 and the upper stationary contact 14. In the present embodiment, the arc extinguishing port 10 may include an opening portion 101 and an arc restricting portion 102.
Among them, the opening portion 101 may be configured as an opening that is located at the top of the rotary blade 12 and is formed through the thickness of the rotary blade 12 in the tangential direction of the rotary blade 12. The arc stoppers 102 may be provided on the inner and/or outer surface of the rotating blade 12 and designed as a hollow shape protruding inwardly and/or outwardly by a certain length, i.e., at the side of the rotating blade 12 facing the first chamber 17 and/or the side facing the second chamber 18 and protruding by a certain length toward the first chamber 17 and/or the second chamber 18, to expand the range of application thereof. In the actual application process, the user can select the materials according to actual needs.
The free end of the movable contact 13 may be located inside the nozzle channel or accommodated inside the nozzle channel or partially accommodated inside the nozzle channel. In an example, when the free end of the movable contact 13 is located inside the nozzle passage, i.e. inside the rotating blade 12, the arc-limiting portion 102 may be located on the inner surface and/or the outer surface of the rotating blade 12. When there is the arc restricting portion 102 on the inner surface of the rotating blade 12, the distance between the movable contact 13 and the rotating blade 12 may be appropriately increased to satisfy the desired length of the arc restricting portion 102 in the tangential direction. In another example, when the free end of the movable contact 13 is accommodated in the interior of the spout channel, the free end of the movable contact 13 occupies a portion of the spout channel, i.e., the free end of the movable contact 13 is located in the interior of the opening portion 101 and/or the interior of the arc limiting portion 102. In the two examples, after the moving contact 13 is mechanically separated from the upper fixed contact 14, a nozzle channel with a certain length is always reserved between the outer side of the moving contact 13 and the inner side of the upper fixed contact 14, so that all arc columns of an electric arc generated between the moving contact 13 and the upper fixed contact 14 when the upper fixed contact 14 does not leave the nozzle channel and a part of arc columns between the moving contact 13 and the upper fixed contact 14 when the upper fixed contact 14 leaves the nozzle channel and the electric arc is not extinguished yet can be well limited in the nozzle channel, and the compressed arc extinguishing gas is sprayed to the upper fixed contact 13 to cool and dissociate the arc columns in the air flow channel outside the nozzle channel, so that the electric arc is blown out. In a further example, the free end of the movable contact 13 may be partially housed inside the spout channel, partially extending towards the inside to the inside of the spout channel. In short, the position of the movable contact 13 relative to the nozzle channel in the present invention only needs to be able to realize that the upper stationary contact 14 needs to travel through the nozzle channel at least longer than the length of the opening 101 on the rotating blade 12 after the movable contact 13 is mechanically separated from the upper stationary contact 14, and no limitation is made on the shapes and the structures of the rotating blade 12, the movable contact 13 and the upper stationary contact 14.
Illustratively, as shown in the figure, the arc limiting portion 102 is formed on the side of the rotating blade 12 facing the second chamber 18 and protrudes to a certain length toward the second chamber 18, and the movable contact 13 is located on the inner side of the nozzle passage, i.e., on the inner side of the rotating blade 12. The arc-limiting portion 102, the opening portion 101 and the free end of the movable contact 13 are located in the same tangential direction of the rotating blade 12, so that the arc-limiting portion 102 and the movable contact 13 are located on the outer side and the inner side of the rotating blade 12 respectively, the arc-limiting portion 102 extends away from the movable contact 13, and the arc-limiting portion 102 and the opening portion 101 can form a nozzle channel in tangential communication. Here, the arc restricting part 102 may be designed to extend at least the thickness of the rotating blade 12, so that the length of the spouting passage, i.e., the length of the spouting passage in the tangential direction, may be designed to be at least twice the thickness of the rotating blade 12 to restrict and blow out the arc between the movable contact 13 and the upper stationary contact 14. In addition, the movable contact 13 is generally configured as a pair of blades axially opposite to each other for elastically clamping the upper fixed contact 14 therein, and then a space between the pair of blades of the movable contact 13 can communicate with the nozzle channel to form a fixed contact moving path.
When the upper fixed contact 14 and the movable contact 13 are switched from the conductive engagement state to the separation state, the insulating main shaft 16 rotates relative to the insulating housing 11, so that the movable contact 13, the rotating blade 12, the opening 101, and the arc limiting portion 102 all rotate relative to the upper fixed contact 14, the upper fixed contact 14 is firstly mechanically separated from the movable contact 13, and then moves away from the movable contact 13 along the nozzle channel, that is, the opening 101 and the arc limiting portion 102. Since the spout passage has a certain length, an arc generated after the upper fixed contact 14 and the movable contact 13 are mechanically separated is confined in the opening 101 and the arc confining portion 102. Meanwhile, due to the rotation of the rotating blade 12, the quenching gas compressed in the first chamber 17 is sprayed to the upper fixed contact 14 far away from the movable contact 13 through the nozzle channel, thereby facilitating the blowing out of the arc confined in the nozzle channel. Wherein, the spout passageway has the extension of certain length, consequently can restrict the cross section of the blast of quenching air in certain length within range to under the condition of equivalent blast of quenching air, can blow out the electric arc with keeping the velocity of flow of quenching air at higher level within certain length within range, with the on-off ability and the reliability of the load switch 1 that improve the spout passageway and use.
It will be appreciated that the size of the cross section of the opening of the nozzle passage taken through the rotating blade 12 should be larger than the size of the cross section of the upper stationary contact 14 coinciding with the opening cross section to facilitate the entrance and exit of the upper stationary contact 14. Preferably, the minimum opening cross section of the nozzle channel may be designed to be less than three times the opening cross section of the upper stationary contact 14, so as to avoid reducing the flow velocity of the quenching air flow ejected along the nozzle channel as much as possible on the basis of facilitating the entrance and exit of the upper stationary contact 14.
Fig. 1 to 8 show by way of example an arc-extinguishing spout 10 according to a first exemplary embodiment of the invention and a load switch 1 to which it is applied. As shown, the opening portion 101 may be configured as a rectangular opening formed at the top of the rotary blade 12 and extending through the thickness of the rotary blade 12 in the tangential direction of the rotary blade 12 to be closed all around. The arc restricting portion 102 is configured in a hollow rectangular shape closed all around. Among them, the shape of the opening cross section of the shape of the opening portion 101 and/or the arc restricting portion 102 may also be configured in a trapezoidal shape, a parallelogram shape, a square shape, or the like. Preferably, the opening cross-sections of the opening portion 101 and the arc restricting portion 102 may be configured to be uniform in shape and size to form a spout passage having a cross-section of a constant shape and size. Alternatively, the opening cross-sections of the opening portion 101 and the arc restricting portion 102 may not have the same shape or size but only need to be configured to communicate with each other so as to pass the compressed arc extinguishing gas. Accordingly, the shape of the opening cross-section of the spout passage may be configured to be identical or non-identical to the cross-sectional shape of the upper stationary contact 14. This design can employ the prior art rotary vane 12 and only the arc limiter 102 is separately designed, thereby greatly reducing the manufacturing cost of the nozzle passage in the present embodiment and improving the production efficiency. For example, the length of the upper stationary contact 14 in the tangential direction of the rotating blade 12 may be 40 mm, and the length of the nozzle passage through which the upper stationary contact 14 is separated from the movable contact 13 may be designed to be any value in the range of 6 mm to 70 mm.
Optionally, as shown in fig. 1 to 4, the upper stationary contact 14 of the load switch 1 applied to the arc extinguishing nozzle 10 is configured to be connected to the top of the arc-shaped cover plate 112 via the connecting arm 19 when in an electrically conductive engagement state with the movable contact 13, and the upper stationary contact 14 passes through the nozzle passage, i.e., the arc-limiting portion 102 and the opening portion 101, from the outer side of the rotating blade 12 to be electrically conductive engaged with the movable contact 13, so as to facilitate the movement when the upper stationary contact 14 is separated from the movable contact 13, and avoid causing an obstruction to the movement.
Alternatively, the rotary blade 12 and the arc restricting portion 102 may be configured to be integrally formed, that is, the opening portion 101 and the arc restricting portion 102 are integrally formed, to improve the manufacturing speed of the load switch in the present embodiment. In addition, the rotary blade 12 and the arc restricting portion 102 may be constructed as separate bodies, and the connection manner between the rotary blade 12 and the arc restricting portion 102 may be designed as a bolt connection as shown in fig. 1 to 8 or any other means capable of connecting the two in a non-movable manner. The materials used for the rotating blade 12 and the arc limiter 102 may be different, for example, the arc limiter 102 may be made of a non-metallic material that is more resistant to ablation than the rotating blade 12. In a specific embodiment, the insulating main shaft 16 and the rotary blade 12 may be formed integrally or separately, and the arc restricting portion 102 may be formed integrally or separately with the above structure and assembled with the above structure by bolting or by any other means capable of connecting the two in a non-movable manner.
Fig. 9 to 16 show an arc-extinguishing nozzle 10 according to a second exemplary embodiment of the invention and a load switch 1 to which it is applied. Compared with the arc-extinguishing spout 10 and the applied load switch 1 in the embodiment shown in fig. 1 to 8, the rest of the structure is basically the same except that the structure of the arc-extinguishing spout 10 and the upper stationary contact 14 is different.
As shown, the opening portion 101 may be configured as an open-topped opening formed on the rotary blade 12 and extending through the thickness of the rotary blade 12 in a tangential direction of the rotary blade 12, and a tip of the rotary blade 12 is closely abutted against an inner side of the arc-shaped cover plate 112 so that the opening is configured in a circumferentially closed form. To ensure the ejection effect of the quenching gas flow, the rotary blade 12 may be configured to maintain a tight abutment with the inner side wall of the insulating housing 11 at least in the first half between the on position and the off position. Alternatively, the rotary blade 12 and the inner side wall of the insulating housing 11 may be designed to be in sealing connection or the minimum gap therebetween should be less than a predetermined value of the gap, such as 3 mm. Further, the arc restricting portion 102 is configured in a hollow shape with an open top side.
The upper stationary contact 14 of the load switch 1 to which the arc extinguishing nozzle 10 is applied may be configured to extend downward from above the rotating blade 12 into the first chamber 17 to be conductively engaged with the movable contact 13 when being conductively engaged with the movable contact 13. When the upper fixed contact 14 and the movable contact 13 are switched from the conductive connection state to the separation state, the upper fixed contact 14 moves through the nozzle channel, i.e., the opening 101 and the arc-limiting portion 102, and the compressed arc-extinguishing gas blows off the arc between the upper fixed contact 14 and the movable contact 13 along the nozzle channel.
In other embodiments, the opening 101 is configured in a four-side closed form or a top-side open form, which can be matched with the arc-limiting part 102 in a four-side closed hollow shape or a top-side open hollow shape as required, but it should be noted that once one of the opening 101 or the arc-limiting part 102 takes the four-side closed form, the upper stationary contact 14 of the load switch 1 should be arranged to extend from the second chamber 18 through the arc-limiting part 102 and/or the opening 101 to be in conductive engagement with the movable contact 13. And only when the opening portion 101 and the arc-limiting portion 102 both adopt the top-side open form, the upper stationary contact 14 of the load switch 1 may be arranged to extend downward from above the rotary blade 12 to be in conductive engagement with the movable contact 13.
It should be understood that although the description is in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations can be made by those skilled in the art without departing from the spirit and principles of the invention.
Claims (9)
1. A load switch (1), the load switch (1) comprising an insulating housing (11) filled with an arc-extinguishing gas and a rotary blade (12) pivotable with respect to the insulating housing (11), the load switch (1) being capable of at least an on-state and an off-state with rotation of the rotary blade (12), characterized in that the insulating housing (11) comprises a bottom plate (111), front and rear sector-shaped side plates (113) oppositely disposed on the bottom plate (111), and an arc-shaped cover plate (112) connecting the bottom plate (111), the front sector-shaped side plates and the rear sector-shaped side plates (113);
the load switch (1) further comprises an insulating main shaft (16) with two ends respectively mounted on the front fan-shaped side plate and the rear fan-shaped side plate (113), and the rotating blade (12) is mounted on the insulating main shaft (16) and extends towards the arc-shaped cover plate (112) to abut against the inner side of the arc-shaped cover plate (112);
the load switch (1) further comprises an arc extinguishing nozzle (10), the arc extinguishing nozzle (10) comprising:
an opening portion (101) configured as an opening formed extending on the rotary blade (12) in a tangential direction of the rotary blade (12);
an arc-limiting portion (102) disposed on an inner surface and/or an outer surface of the rotary blade (12) and designed to be a hollow shape protruding inward and/or outward by a certain length in a tangential direction of the rotary blade, the arc-limiting portion (102) being communicated with the opening portion (101) to form a nozzle passage, so that when the load switch (1) is switched from an on state to an off state, arc-extinguishing gas compressed by the rotary blade (12) in an inner space formed by the bottom plate (111), the front sector-shaped side plate, the rear sector-shaped side plate (113), and the arc-shaped cover plate (112) is ejected along the nozzle passage;
the load switch (1) further comprises an upper fixed contact (14) which is immovable relative to the arc-shaped cover plate (112) and is connected to the arc-shaped cover plate (112), and a movable contact (13) which can move along with the rotating blade (12) and is connected to the rotating blade (12) so as to be in conductive engagement with or separated from the upper fixed contact (14), wherein the upper fixed contact (14) is configured to move away from the movable contact (13) and along the spout channel when the movable contact (13) rotates towards the bottom plate (111) and is converted from a conductive engagement state to a separation state with the movable contact (13);
wherein the rotary blade (12) is configured to maintain a close abutment with the inner side wall of the insulating housing (11) in a first half between the on position and the off position, and not to maintain a close abutment with the inner side wall of the insulating housing (11) in a second half between the on position and the off position.
2. The load switch (1) according to claim 1, wherein said upper stationary contact (14) is configured to extend along said spout channel from outside said rotating blade (12) to be in electrically conductive engagement with said movable contact (13).
3. The load switch (1) according to claim 1, wherein said upper stationary contact (14) is configured to extend downwardly from an upper side of said rotary blade (12) to be in electrically conductive engagement with said movable contact (13).
4. The load switch (1) according to claim 1, wherein the opening (101) is configured as a circumferentially closed opening extending in a tangential direction of the rotary blade (12) over the rotary blade (12).
5. The load switch (1) according to claim 1, wherein the opening portion (101) is configured as an open-top opening formed by extending the rotary blade (12) in a tangential direction of the rotary blade (12), and a tip of the rotary blade (12) abuts against an inner side wall of the insulating housing (11) so that the opening portion (101) is configured in a circumferentially closed manner.
6. The load switch (1) according to claim 1, wherein the arc restricting portion (102) is configured in a hollow shape closed all around.
7. The load switch (1) according to claim 1, wherein the arc restricting portion (102) is configured in a hollow shape with an open top side.
8. The load switch (1) according to claim 1, wherein the opening portion (101) and the arc restricting portion (102) are designed as a separate structure.
9. The load switch (1) according to claim 1, wherein the opening portion (101) and the arc restricting portion (102) are designed to be integrally formed.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010459975.6A CN111524744B (en) | 2020-05-27 | 2020-05-27 | Arc extinguishing nozzle and load switch with same |
| EP21176393.3A EP3916751B1 (en) | 2020-05-27 | 2021-05-27 | An arc extinguishing nozzle and a load switch with the arc extinguishing nozzle |
| PT211763933T PT3916751T (en) | 2020-05-27 | 2021-05-27 | An arc extinguishing nozzle and a load switch with the arc extinguishing nozzle |
| ES21176393T ES2957834T3 (en) | 2020-05-27 | 2021-05-27 | An arc extinguishing nozzle and a load switch with the arc extinguishing nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010459975.6A CN111524744B (en) | 2020-05-27 | 2020-05-27 | Arc extinguishing nozzle and load switch with same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111524744A CN111524744A (en) | 2020-08-11 |
| CN111524744B true CN111524744B (en) | 2023-03-31 |
Family
ID=71912905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010459975.6A Active CN111524744B (en) | 2020-05-27 | 2020-05-27 | Arc extinguishing nozzle and load switch with same |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3916751B1 (en) |
| CN (1) | CN111524744B (en) |
| ES (1) | ES2957834T3 (en) |
| PT (1) | PT3916751T (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0270389A1 (en) * | 1986-11-03 | 1988-06-08 | Merlin Gerin | Gas insulated multiphase rotating switch |
| EP0484747A2 (en) * | 1990-11-06 | 1992-05-13 | G & W ELECTRIC COMPANY | Rotary puffer switch |
| CN201655650U (en) * | 2010-01-25 | 2010-11-24 | 刘坚钢 | High-voltage load switch |
| CN102629530A (en) * | 2012-03-30 | 2012-08-08 | 厦门华电开关有限公司 | Arc-extinguishing load switch and switch equipment |
| CN104616928A (en) * | 2015-02-04 | 2015-05-13 | 厦门凯能电力科技有限公司 | Load switch |
| CN107706037A (en) * | 2017-10-29 | 2018-02-16 | 默飓电气有限公司 | A kind of high voltage load switch |
| CN207319990U (en) * | 2017-10-29 | 2018-05-04 | 默飓电气有限公司 | A kind of high voltage load switch |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3743827A1 (en) * | 1987-03-11 | 1988-09-22 | Sachsenwerk Ag | ARC EXTINGUISHING DEVICE FOR LOAD SWITCHES |
| DE3803117A1 (en) * | 1988-02-03 | 1989-08-17 | Sachsenwerk Ag | Circuit breaker (current interrupter) for encased switching stations filled with an insulating gas |
| JP4865467B2 (en) * | 2006-09-15 | 2012-02-01 | 中部電力株式会社 | Arc extinguishing method for power distribution equipment and power distribution equipment |
-
2020
- 2020-05-27 CN CN202010459975.6A patent/CN111524744B/en active Active
-
2021
- 2021-05-27 ES ES21176393T patent/ES2957834T3/en active Active
- 2021-05-27 PT PT211763933T patent/PT3916751T/en unknown
- 2021-05-27 EP EP21176393.3A patent/EP3916751B1/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0270389A1 (en) * | 1986-11-03 | 1988-06-08 | Merlin Gerin | Gas insulated multiphase rotating switch |
| EP0484747A2 (en) * | 1990-11-06 | 1992-05-13 | G & W ELECTRIC COMPANY | Rotary puffer switch |
| US5153399A (en) * | 1990-11-06 | 1992-10-06 | G&W Electric Company | Rotary puffer switch |
| CN201655650U (en) * | 2010-01-25 | 2010-11-24 | 刘坚钢 | High-voltage load switch |
| CN102629530A (en) * | 2012-03-30 | 2012-08-08 | 厦门华电开关有限公司 | Arc-extinguishing load switch and switch equipment |
| CN104616928A (en) * | 2015-02-04 | 2015-05-13 | 厦门凯能电力科技有限公司 | Load switch |
| CN107706037A (en) * | 2017-10-29 | 2018-02-16 | 默飓电气有限公司 | A kind of high voltage load switch |
| CN207319990U (en) * | 2017-10-29 | 2018-05-04 | 默飓电气有限公司 | A kind of high voltage load switch |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3916751A1 (en) | 2021-12-01 |
| CN111524744A (en) | 2020-08-11 |
| ES2957834T3 (en) | 2024-01-26 |
| EP3916751B1 (en) | 2023-08-02 |
| PT3916751T (en) | 2023-10-03 |
| EP3916751C0 (en) | 2023-08-02 |
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