CN112735901A - Vacuum arc-extinguishing chamber with composite contact structure - Google Patents
Vacuum arc-extinguishing chamber with composite contact structure Download PDFInfo
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- CN112735901A CN112735901A CN202011381558.0A CN202011381558A CN112735901A CN 112735901 A CN112735901 A CN 112735901A CN 202011381558 A CN202011381558 A CN 202011381558A CN 112735901 A CN112735901 A CN 112735901A
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- contact
- static
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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
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
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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
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/662—Housings or protective screens
-
- 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
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/662—Housings or protective screens
- H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention relates to a vacuum arc-extinguishing chamber with a composite contact structure, which comprises: the static contact structure comprises a static main contact, a static arc contact and a static end corrugated pipe, wherein the static arc contact is movably assembled in the static main contact, and the static end corrugated pipe applies elastic reset acting force to the static arc contact; the moving contact structure comprises a moving main contact, a moving arc contact and a moving end corrugated pipe; the moving arc contact is movably assembled in the moving main contact; the bellows at the moving end applies elastic reset acting force to the moving arc contact to force the moving arc contact to move towards the static arc contact. The static end corrugated pipe and the moving end corrugated pipe are utilized to enable the static arc contact and the moving arc contact to move relative to the corresponding main contacts, the protruding amount of the two arc contacts relative to the main contacts is offset by the two arc contacts, and compared with a scheme of only depending on static arc contact movement offset in the prior art, the scheme of utilizing the two arc contacts to act can effectively reduce the moving distance of the static arc contact, the overtravel condition of the vacuum arc extinguish chamber can be reduced, and the requirement on the installation place of the vacuum arc extinguish chamber is reduced.
Description
Technical Field
The invention belongs to the technical field of vacuum switches, and particularly relates to a vacuum arc-extinguishing chamber with a composite contact structure.
Background
With the development of economy, the vacuum circuit breaker gradually replaces a sulfur hexafluoride circuit breaker by the characteristics of environmental friendliness, long service life, no maintenance and the like, and becomes a hot point of research at home and abroad. The difficulty for the vacuum arc-extinguishing chamber is how to conduct rated current under normal conditions and break fault current under fault conditions.
In the chinese utility model patent with the publication number CN2023076740U, a vacuum interrupter is disclosed, although the static contact includes an arc contact and a main contact which are separately arranged, the moving contact still has an integrated structure of the main contact and the arc contact, even if the structure of the longitudinal magnetic field contact with the best breaking capability and suitable for high voltage and large breaking capacity is adopted, the through-current capability of the moving contact is still inferior to that of a simple main contact conductor under the effect of the ac skin effect. The invention discloses a vacuum arc-extinguishing chamber in Chinese patent application with application publication No. CN111463061A, wherein a static main contact is provided with a channel extending along the plugging direction, a static arc contact is movably and conductively assembled in the channel of the static main contact along the plugging direction, the main contact is in a cylindrical shape with an opening at one end and is sleeved outside a movable arc contact, the main contact is separated from the arc contact no matter the static end or the movable end, the static main contact is in butt joint communication with the movable main contact during closing, the through-flow capacity of the arc-extinguishing chamber is ensured, and when the vacuum arc-extinguishing chamber is opened, the movable arc contact and the static arc contact which adopt a coil magnetic field structure break electric arcs, so that the performance of the vacuum arc-extinguishing chamber for through-flow and open-break.
In the existing vacuum arc extinguish chamber with a composite contact structure with separated main contacts and arc contacts, a moving arc contact is fixed on the moving main contact, a static arc contact is movably assembled in a channel of the static main contact along the action direction of a moving contact, the static arc contact is pressed to retreat on the basis that the corresponding arc contact protrudes out of the corresponding main contact, and the moving main contact and the static main contact can be ensured to be in normal conductive contact under the condition that the moving arc contact and the static arc contact are in pilot electrical contact. In fact, in the existing vacuum arc-extinguishing chamber, only the static arc contact is generally designed into a movable mode, and the mode has a simple structure and is convenient to repair and maintain. However, in the design that only the static arc contacts are pressed and retreated, the protrusion amount of the two arc contacts protruding out of the two main contacts is only compensated by retreating the static arc contacts, so that the static arc contacts are required to have enough retreating and avoiding space, higher requirements are provided for the static end of the vacuum arc-extinguishing chamber, higher requirements are provided for the installation space of the vacuum arc-extinguishing chamber, and the design is not suitable for being applied to places with limited installation space.
Disclosure of Invention
The invention aims to provide a vacuum arc-extinguishing chamber with a composite contact structure, which aims to solve the technical problem that the static arc contact needs to have enough space for retreating and avoiding because the static contact retreats only by being pressed to offset the protrusion amount of the two arc contacts protruding out of the two main contacts in the prior art.
In order to achieve the purpose, the technical scheme of the vacuum arc-extinguishing chamber with the composite contact structure provided by the invention is as follows: a vacuum interrupter with a composite contact structure, comprising:
the arc extinguish chamber shell is internally provided with a static contact structure positioned above and a movable contact structure positioned below;
the static contact structure comprises a static main contact and a static arc contact which are in conductive connection, the static main contact is in a sleeve shape, and the static arc contact is movably assembled in the static main contact along the up-down direction;
the moving contact structure comprises a moving main contact and a moving arc contact which are in conductive connection;
the movable main contact and the static main contact are used for normal through-flow, and the movable arc contact and the static arc contact are used for arc extinction;
the static arc contact is arranged in a manner of protruding out of the static main contact along the direction towards the movable contact structure, the movable arc contact is arranged in a manner of protruding out of the movable main contact along the direction towards the static contact structure, the movable arc contact and the static arc contact are contacted before the movable main contact and the static main contact during switching-on, and the movable arc contact and the static arc contact are separated from the movable main contact and the static main contact after the movable arc contact and the static arc contact during switching-off;
the static contact structure also comprises a static end corrugated pipe, the static end corrugated pipe extends along the vertical direction, the static end corrugated pipe is sleeved outside the static arc contact, and the static end corrugated pipe applies elastic reset acting force to the static arc contact so as to force the static arc contact to move towards the moving arc contact;
the movable main contact is sleeve-shaped, and the movable arc contact is movably assembled in the movable main contact along the up-down direction;
the moving contact structure further comprises a moving end corrugated pipe, the moving end corrugated pipe extends in the vertical direction, the moving end corrugated pipe is sleeved outside the moving arc contact, and the moving end corrugated pipe applies elastic reset acting force to the moving arc contact so as to force the moving arc contact to move towards the static arc contact.
The beneficial effects are that: the static end corrugated pipe and the moving end corrugated pipe are utilized to enable the static arc contact and the moving arc contact to move relative to the corresponding main contacts, when a switch is switched on, the two arc contacts can move relative to the corresponding main contacts, the protruding amount of the two arc contacts relative to the main contacts can be offset by the two moving arc contacts, compared with a scheme of only depending on static arc contact movement offset in the prior art, the scheme of utilizing the two arc contacts to act can effectively reduce the moving distance of the static arc contact, the overtravel condition of the vacuum arc extinguish chamber can be reduced, and the requirement on the installation place of the vacuum arc extinguish chamber is reduced.
As a further improvement, the movable end corrugated pipe is positioned in the movable main contact, one end of the movable end corrugated pipe is fixedly connected with the movable main contact, and the other end of the movable end corrugated pipe is fixedly connected with the movable arc contact.
The beneficial effects are that: the movable end corrugated pipes are positioned in the movable main contact, and can be relatively intensively arranged.
As a further improvement, the upper end of the movable end corrugated pipe is fixedly connected with the movable arc contact, the lower end of the movable end corrugated pipe is fixedly connected with the movable main contact, the lower end of the movable main contact is fixedly connected with the movable conductive rod, and the movable end corrugated pipe is always in a compressed state when the movable conductive rod drives the movable main contact and the movable arc contact to move up and down to realize the opening and closing operation.
The beneficial effects are that: the upper end of the movable end corrugated pipe is connected with the movable arc contact, and the lower end of the movable end corrugated pipe is connected with the movable main contact, so that the movable end corrugated pipe is always in a compression state in the whole opening and closing process, and the danger of breakage and leakage caused by excessive stretching times can be effectively avoided.
As a further improvement, a lower assembly groove is formed in the movable main contact, and the lower end of the movable end corrugated pipe is connected to the bottom of the lower assembly groove in a welded mode.
The beneficial effects are that: the movable end corrugated pipe is conveniently positioned, placed and fixedly connected by utilizing the lower assembling groove arranged on the movable main contact.
As a further improvement, one main contact of the static main contact and the movable main contact is provided with a conical outer peripheral surface, the other main contact is provided with a conical concave part, the conical concave part is provided with a conical inner peripheral surface, and the conical inner peripheral surface is matched and inserted with the conical outer peripheral surface when the switch is switched on so as to realize normal through-flow
The beneficial effects are that: the tapered fit insertion fit between the movable main contact and the static main contact is utilized, so that the flow area can be effectively increased, and the flow capacity can be improved.
As a further improvement, the corresponding main contact with the conical recess in the static main contact and the dynamic main contact comprises a plurality of contact lobes, all the contact lobes are uniformly distributed at intervals along the circumferential direction, and the inner side surfaces of all the contact lobes are matched to form the conical inner peripheral surface.
The beneficial effects are that: the corresponding main contact is in a contact lobe structure, so that the elasticity of the main contact can be improved, the contact pressure is ensured, the contact area is ensured, and meanwhile, the centering performance is improved.
As a further improvement, the respective main contacts of the static main contact and the dynamic main contact, which have the tapered recesses, are sheathed with contact shields.
The beneficial effects are that: the electric field of the respective main contact can be optimized by means of the contact shield.
As a further improvement, a static supporting conductor is fixedly arranged at the upper end of the static main contact, the static supporting conductor is in a sleeve shape, the arc extinguish chamber shell comprises an upper sealing cover, the static supporting conductor is fixedly assembled with the upper sealing cover, a static conductive sleeve is fixedly and electrically inserted into the static supporting conductor, the static arc contact comprises an upper head part and an upper rod part, the upper head part is used for being in conductive contact with the moving arc contact, the upper rod part is guided to be slidably inserted into the static conductive sleeve, a static end conductive contact finger is arranged in the static conductive sleeve, and the static end conductive contact finger is in sliding conductive fit with the upper rod part.
The beneficial effects are that: the static conductive sleeve is inserted between the upper rod part of the static supporting conductor and the upper rod part of the static arc contact, the static end conductive contact finger is arranged in the static conductive sleeve, the static conductive sleeve is conveniently inserted into the static supporting conductor after the welding assembly of the shell of the arc extinguish chamber is completed, on the basis that the sliding conductive fit of the upper rod part and the static conductive sleeve is ensured, the static end conductive contact finger is prevented from being influenced by the welding high temperature of the shell of the arc extinguish chamber, and the service life of the movable end conductive contact finger is ensured.
As a further improvement, the lower end of the movable main contact is fixedly connected with a movable conducting rod, the arc extinguish chamber shell comprises a lower sealing cover, the movable conducting rod penetrates through the lower sealing cover in a sealing and sliding manner, a lower corrugated pipe is sleeved outside the movable conducting rod, the lower end of the lower corrugated pipe is fixedly connected with the lower sealing cover, the upper end of the lower corrugated pipe is fixedly connected with the movable conducting rod or the movable main contact, the movable conducting rod is in a sleeve shape, the movable arc contact comprises a lower head part and a lower rod part, the lower head part is used for being in conductive contact with the static arc contact, the lower rod part is inserted into the movable conducting rod in a guiding and sliding manner, a movable end conductive contact finger is arranged in the movable conducting rod, and the movable end conductive contact finger is in.
The beneficial effects are that: in this embodiment, the movable main contact and the movable arcing contact are conductively connected by the sliding conductive assembly of the movable conductive rod and the lower rod portion of the movable arcing contact.
As a further improvement, the movable conducting rod comprises an upper connecting pipe section and a lower conducting pipe section which are connected in a welding manner, the upper connecting pipe section is fixedly connected with the lower end of the movable main contact, the movable end conductive contact finger is arranged on the inner side of the lower conducting pipe section, the lower rod part is in guide fit with the upper connecting pipe section and/or the lower conducting pipe section, and the upper connecting pipe section is provided with a guide fit section which is used for being in guide seal fit with the lower sealing cover, so that the butt joint of the upper connecting pipe section and the lower conducting pipe section can be moved to the lower part of the lower sealing cover to be assembled outside the vacuum arc extinguish chamber in a welding manner.
The beneficial effects are that: the movable conducting rod comprises an upper connecting pipe section and a lower conducting pipe section, the lower end of the upper connecting pipe section is conveniently pulled out after the arc extinguish chamber shell is welded and assembled, the lower conducting pipe section is welded and connected with the upper connecting pipe section, the movable end conducting contact finger in the lower conducting pipe section is prevented from being influenced by high-temperature welding of the arc extinguish chamber shell, and the service life of the movable end conducting contact finger is guaranteed.
Drawings
Fig. 1 is a schematic view of a switching-off structure of a vacuum arc-extinguishing chamber with a composite contact structure provided by the invention;
fig. 2 is a schematic diagram of a closing structure of the vacuum interrupter shown in fig. 1;
fig. 3 is an exploded view of the vacuum interrupter of fig. 1.
Description of reference numerals:
1. a static conductive sleeve; 2. a static end contact finger mounting groove; 3. a static end conductive contact finger; 4. a stationary end guide groove; 5. an upper sealing cover; 6. a stationary support conductor; 7. a stationary arc contact; 71. an upper head portion; 72. an upper rod part; 8. a stationary main contact; 81. a tapered outer peripheral surface; 9. a static end bellows; 11. a moving arc contact; 111. a lower head portion; 112. a lower rod part; 12. a contact shield; 13. a moving end bellows; 14. a movable main contact; 141. a contact lobe; 142. a tapered recess; 15. a lower bellows; 16. a movable conductive rod; 17. a lower sealing cover; 18. a lower conductive pipe section; 19. an arc extinguishing chamber housing; 20. a movable end contact finger mounting groove; 21. and a movable end guide groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, elements recited by the phrase "comprising an … …" do not exclude the inclusion of such elements in processes or methods.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
The present invention will be described in further detail with reference to examples.
The invention provides a vacuum arc-extinguishing chamber with a composite contact structure, which comprises the following specific embodiments in percentage by weight:
in the vacuum interrupter of taking composite contact structure that this embodiment provided, no matter quiet arc contact 7, still move arc contact 11 and all can move corresponding main contact relatively, reducible single quiet arc contact 7 displacement, and then can reduce whole vacuum interrupter quiet end occupation space relatively, optimize vacuum interrupter wholeness ability.
The vacuum arc extinguish chamber has a specific structure as shown in fig. 1 to 3, the vacuum arc extinguish chamber in this embodiment includes an arc extinguish chamber housing 19, a stationary contact structure and a movable contact structure are provided in the arc extinguish chamber housing 19, the stationary contact structure is located above the movable contact structure, the arc extinguish chamber housing 19 includes a middle circumferential housing, an upper sealing cover 5 at the upper end and a lower sealing cover 17 at the lower end, and the two sealing covers are correspondingly fixed at the two ends of the circumferential housing.
The arc chute housing 19 here comprises an upper cover 5, a lower cover 17 and an intermediate housing part, which is usually formed by a multi-segment ceramic shell welded connection.
The static contact structure comprises a static main contact 8, a static arc contact 7, a static supporting conductor 6 and a static conductive sleeve 1, an upper sealing cover 5 is fixed at the upper end of an arc extinguish chamber shell 19, the lower end of the upper sealing cover 5 is connected with the static supporting conductor 6 in a welding way, the lower end of the static supporting conductor 6 is connected with the static main contact 8 in a welding way, the static main contact 8 and the static supporting conductor 6 are both in sleeve structures, the static arc contact 7 is assembled in the static main contact 8 in a guiding and sliding way along the up-down direction, the static arc contact 7 is in a T-shaped structure and comprises an upper head part 71 and an upper rod part 72, the upper head part 71 is used for being in conductive contact with the dynamic arc contact 11, the upper rod part 72 is positioned above the upper head part 71 and is in guiding and sliding fit with the static conductive sleeve 1, the inner hole of the static main contact 8 is a stepped through hole, the stepped through hole is arranged with the step surface facing downwards, big footpath hole section is used for holding upper header 71 down, install quiet end bellows 9 in big footpath hole section down, quiet end bellows 9 suit is on quiet arc contact 7, the upper end of quiet end bellows 9 and the downward ladder face fixed connection of ladder through-hole, the lower extreme and the last header 71 fixed connection of quiet arc contact 7, to quiet end bellows 9, it exerts the elastic force that resets to the static contact, when separating brake is accomplished, make quiet arc contact 7 down, make quiet arc contact 7 outstanding in quiet main contact 8 arrange down.
For convenient positioning and assembling, the lower end of the static supporting conductor 6 is in plug-in fit with the upper end of the static main contact 8, the upper end of the static main contact 8 is provided with a circular groove, the lower end of the static supporting conductor 6 is provided with a cylindrical protrusion, the cylindrical protrusion is in plug-in fit with the circular groove, the static main contact 8 and the static supporting conductor 6 are convenient to be in plug-in fit in a centering mode, and the static main contact and the static supporting conductor are convenient to be in welded connection.
The static supporting conductor 6 is internally provided with a static conductive sleeve 1 in a penetrating way, and the static conductive sleeve 1 and the static supporting conductor 6 can be welded together after being inserted into the static conductive sleeve. Go up pole portion 72 and upwards extend into quiet electric conduction cover 1 to when quiet arc contact 7 reciprocating motion, go up pole portion 72 and the leading sliding fit of quiet electric conduction cover 1, and, set up quiet end in quiet electric conduction cover 1 and touch finger mounting groove 2, install quiet end in the quiet end touches finger mounting groove 2 and electrically conducts and touch finger 3, quiet end electrically conducts and touches finger 3 specifically adopts the watchband to touch the finger, the watchband touches finger and goes up pole portion 72 sliding electrical contact, realizes that quiet end electrically conducts and touches finger 3 and last pole portion 72 electrically conductive connection.
It should be noted that the upper end of the static supporting conductor 6 is open, so that the static conductive sleeve 1 can be conveniently inserted into the upper rod part 72 and the static supporting conductor 6 from the upper end, the installation mode can firstly complete the welding assembly of the arc extinguish chamber shell 19, and complete the assembly of the static main contact 8, the static supporting conductor 6 and the static arc contact 7, then the static conductive sleeve 1 is inserted into the static supporting conductor 6 from the upper end, the high-temperature welding is completed before the watchband contact finger is installed, and further, the influence of high temperature on the conductive contact finger when the vacuum arc extinguish chamber is integrally welded at high temperature can be effectively reduced.
In order to improve the guiding fit between the upper rod part 72 of the static arc contact 7 and the static conductive sleeve 1, a static end guide groove 4 is arranged on the inner wall of the static conductive sleeve 1, and a static end guide ring is arranged in the static end guide groove 4 and used for guiding the guiding fit of the upper rod part 72 and the static conductive sleeve 1.
In order to conveniently realize the fixation of the static conductive sleeve 1, a connecting flange is fixedly arranged at the upper end of the static conductive sleeve 1, after the static conductive sleeve 1 is installed in place, the connecting flange is in press fit with the static end supporting conductor, and then the connecting flange and the static end supporting conductor are welded.
In this embodiment, the movable contact structure includes a movable main contact 14, a movable arcing contact 11 and a movable conducting rod 16, wherein, the movable main contact 14 and the movable conducting rod 16 are both sleeve-shaped, the movable arc contact 11 is movably assembled in the movable main contact 14 along the up-down direction, actually, the movable main contact 14 and the static main contact 8 are used for normal through-flow, the movable arc contact 11 and the static arc contact 7 are used for arc extinction, furthermore, the movable arc contact 11 is arranged to protrude from the movable main contact 14 in the direction of the structure of the fixed contact, the fixed arc contact 7 is arranged to protrude from the fixed main contact 8 in the direction of the structure of the movable contact, the movable arc contact 11 is arranged to protrude from the movable main contact 14 in the direction of the structure of the fixed contact, when the vacuum arc extinguish chamber is switched on, the movable arc contact 11 and the static arc contact 7 are contacted with the movable main contact 14 and the static main contact 8 firstly, when the vacuum arc extinguish chamber is opened, the movable arc contact 11 and the static arc contact 7 are separated from the movable main contact 14 and the static main contact 8.
The upper end of the movable conducting rod 16 is connected with the lower end of the movable main contact 14 in a welding mode, the lower end of the movable conducting rod 16 is used for extending out of the arc extinguish chamber shell 19 to be connected with an insulating pull rod of a corresponding operating mechanism in a transmission mode, in order to achieve effective sealing, a lower corrugated pipe 15 is sleeved outside the movable conducting rod 16, the upper end of the lower corrugated pipe 15 is connected with the movable main contact 14 in a welding mode, and the lower end of the lower corrugated pipe is connected with a lower sealing cover 17 of the arc extinguish chamber shell 19. And, the lower bellows 15 applies a return elastic force to the movable main contact 14 to force the movable main contact 14 to move toward the opening direction.
In fact, the top of the moving main contact 14 is matched and inserted with the static main contact 8, the static main contact 8 has a tapered outer peripheral surface 81, the tapered outer peripheral surface 81 is gradually reduced in radial size from top to bottom, the moving main contact 14 has an upward tapered concave part 142, the tapered concave part 142 has a tapered inner peripheral surface, and when the arc extinguish chamber is closed, the tapered inner peripheral surface is matched and inserted with the tapered outer peripheral surface 81 to realize normal through current.
In addition, the tapered outer peripheral surface 81 and the tapered inner peripheral surface are both conical surfaces to obtain a good electric field effect.
The top end of the movable main contact 14 comprises a plurality of contact lobes 141, all the contact lobes 141 are uniformly distributed at intervals along the circumferential direction, all the contact lobes 141 are matched to form the tapered concave part 142, and the inner side surfaces of all the contact lobes 141 are matched to form the tapered inner peripheral surface. The design of the slotting and splitting can make the movable main contact 14 have certain elasticity, ensure the contact pressure and ensure the contact area. And the closing centering coaxiality of the movable contact and the fixed contact can be optimized.
In order to improve the effect of the peripheral electric field of the movable main contact 14, a contact shielding cover 12 is sleeved outside the movable main contact 14.
In this embodiment, the moving arcing contact 11 includes a lower head portion 111 and a lower rod portion 112, the lower head portion 111 is used for being in conductive contact with the upper head portion 71 of the stationary arcing contact 7, the lower rod portion 112 is assembled in the moving conducting rod 16 in a sliding conductive manner along the up-down direction, the inner wall of the moving conducting rod 16 is provided with a moving end guide groove 21 and a moving end contact finger installation groove 20, a moving end guide ring is arranged in the moving end guide groove 21, the moving end contact finger installation grooves 20 are arranged in two spaced manners along the up-down direction, a moving end watchband contact finger is fixedly assembled in each moving end contact finger installation groove 20, and the lower rod portion 112 is assembled in a sliding conductive manner with the moving end watchband contact finger, so as to realize conductive connection of the moving arcing contact 11.
The moving arc contact 11 is arranged in the moving main contact 14 in a penetrating way, a moving end corrugated pipe 13 is sleeved outside the moving arc contact 11, the moving end corrugated pipe 13 extends along the vertical direction, and the moving end corrugated pipe 13 applies elastic reset acting force to the moving arc contact 11 so as to force the moving arc contact to move towards the static arc contact 7. In fact, the movable end bellows 13 is located in the movable main contact 14, the lower end of the movable end bellows 13 is fixedly connected with the movable main contact 14, and the upper end of the movable end bellows 13 is fixedly connected with the movable arcing contact 11, specifically, a lower assembly groove is arranged at the center position of the movable main contact, and the lower end of the movable end bellows 13 is welded and connected to the bottom of the lower assembly groove so as to be fixedly connected with the movable main contact 14.
In addition, the lower end of the movable main contact 14 is fixedly connected with a movable conducting rod 16, the movable conducting rod 16 comprises an upper connecting pipe section and a lower conducting pipe section 18, the upper connecting pipe section and the lower conducting pipe section are welded, the upper connecting pipe section is fixedly connected with the lower end of the movable main contact 14, in addition, a bulge is arranged at the bottom of the movable main contact and is matched with the upper end of the upper connecting pipe section in an inserting mode, and therefore the movable main contact and the upper connecting pipe section can be conveniently welded and connected. Corresponding guide rings and movable end conducting treatment are arranged in the lower conductive pipe section 18, and the lower rod part 112 of the movable arc contact 11 is correspondingly inserted into the lower conductive pipe section 18 in an inosculating manner.
Moreover, the upper connecting pipe section is provided with a guide matching section for guiding and sealing matching with the lower sealing cover 17, so that the butt joint of the upper connecting pipe section and the lower conducting pipe section 18 can move to the lower part of the lower sealing cover 17, and welding assembly outside the vacuum arc-extinguishing chamber is facilitated. In this way, after the arc chute housing 19 is welded and assembled, the lower conducting pipe section 18, to which the guide ring and the moving-end strap fingers are fitted, can be welded and connected to the upper connecting pipe section.
As shown in fig. 1, during closing, the movable conducting rod 16 drives the movable main contact 14 to move upwards, the lower bellows 15 stretches, meanwhile, the movable conducting rod 16 drives the movable arcing contact 11 to move upwards through the movable end bellows 13, the movable end bellows 13 is pressed, the movable arcing contact 11 protrudes out of the movable main contact 14 to be arranged, so that the movable arcing contact 11 and the static arcing contact 7 contact with the movable main contact 14 and the static main contact 8 before, and continue to move upwards along with the movable conducting rod 16 until the static main contact 8 and the movable main contact 14 are matched in an insertion manner, thereby completing the closing operation. In the process of contacting the moving arc contact 11 and the static arc contact 7, the moving arc contact 11 and the static arc contact 7 retreat respectively, and the moving end corrugated pipe 13 and the static end corrugated pipe 9 are compressed and deformed respectively.
During opening, as shown in fig. 2, the movable conducting rod 16 drives the movable main contact 14 to move downwards, the lower corrugated pipe 15 is compressed, the movable main contact 14 is separated from the static main contact 8 first, at this time, under the action of the movable end corrugated pipe 13 and the static end corrugated pipe 9, the static arc contact 7 and the movable arc contact 11 are still in a contact state to realize contact arc striking, and the movable conducting rod 16 continues to move downwards until the movable arc contact 11 and the static arc contact 7 are separated to perform arc striking and arc extinguishing, so that opening operation is realized.
It should be noted that, in order to improve the arc extinguishing effect, the arc contact may adopt a coil type contact to improve the arc extinguishing effect.
In this embodiment, utilize moving end bellows and quiet end bellows to make two arc contacts all can be for corresponding main contact relative movement, when closing a floodgate, two arc contacts can be main contact compression removal respectively, avoid only that single arc contact removes the problem that the overtravel is big, explosion chamber overall dimension is big that brings.
Moreover, for the end bellows, the upper end is fixedly connected with the moving arc contact, and the lower end is fixedly connected with the moving main contact, so that the moving end bellows is actually in a compressed state in the whole switching-on and switching-off process relative to the assembly state. Certainly, for the static end corrugated pipe, relative to the assembly state, in the closing and opening processes, the static end corrugated pipe is also in a compression state, so that the risk that the service life of the corrugated pipe is influenced due to too many stretching times is reduced.
The invention provides a specific embodiment 2 of a vacuum arc-extinguishing chamber with a composite contact structure, which comprises the following steps:
the difference from example 1 is mainly that: in embodiment 1, in the embodiment, the stationary main contact has a tapered outer peripheral surface, and the movable main contact has a tapered recess. In the embodiment, the movable main contact is provided with the conical peripheral surface, the static main contact is provided with the conical concave part, the conical insertion of the two main contacts can be realized, and the contact area can be effectively increased.
In general, the movable contact structure is disposed below and the fixed contact structure is disposed above, but in other embodiments, the movable contact structure may be disposed above and the fixed contact structure may be disposed below.
The invention provides a specific embodiment 3 of a vacuum arc-extinguishing chamber with a composite contact structure, which comprises the following steps:
the difference from example 1 is mainly that: in embodiment 1, both the tapered outer peripheral surface of the stationary main contact and the tapered inner peripheral surface of the moving main contact are conical surfaces. In this embodiment, the conical outer circumferential surface of the stationary main contact and the conical inner circumferential surface of the moving main contact may be pyramidal surfaces, but for the purpose of improving the electric field performance, the edge of the stationary main contact may be designed to have a rounded corner structure.
The invention provides a specific embodiment 4 of the vacuum arc-extinguishing chamber with the composite contact structure, which comprises the following steps:
the difference from example 1 is mainly that: in embodiment 1, the dynamic main contact comprises a plurality of contact lobes. In this embodiment, the movable main contact may also have an integral contact structure having a tapered recess for mating with the tapered outer peripheral surface of the stationary main contact.
The invention provides a specific embodiment 5 of the vacuum arc-extinguishing chamber with the composite contact structure, which comprises the following steps:
the difference from example 1 is mainly that: in embodiment 1, the movable end bellows is provided in the movable main contact. In this embodiment, the movable end bellows may also be disposed in the movable conducting rod, the movable end bellows is sleeved outside the lower rod portion of the movable arcing contact, one end of the movable end bellows is welded to the movable arcing contact, and the other end of the movable end bellows is fixedly connected to the movable conducting rod.
The invention provides a specific embodiment 6 of the vacuum arc-extinguishing chamber with the composite contact structure, which comprises the following steps:
the difference from example 1 is mainly that: in embodiment 1, the static conductive sleeve provided with the static end conductive contact finger and the lower conductive pipe section provided with the moving end conductive contact finger can be assembled after the arc extinguish chamber shell is welded and assembled, so that the influence of high-temperature welding on the corresponding conductive contact finger can be avoided. In this embodiment, the conductive contact fingers may also be fixedly mounted on the inner walls of the stationary main contact and the moving main contact in advance, so that the assembly of the stationary main contact and the moving main contact with the corresponding conductive contact fingers needs to be completed before the arc extinguish chamber housing is welded and assembled.
The invention provides a specific embodiment 7 of the vacuum arc-extinguishing chamber with the composite contact structure, which comprises the following steps:
the difference from example 1 is mainly that: in example 1, the upper end of the lower bellows was welded to the movable main contact. In this embodiment, the upper end of the lower bellows is fixedly connected to the movable conducting rod, and may be welded to the upper connecting rod segment of the movable conducting rod. And, in this embodiment, the lower rod part of the moving arc contact can be matched with the upper connecting pipe section in a guiding way.
Finally, although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments without departing from the inventive concept, or some of the technical features may be replaced with equivalents. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A vacuum interrupter with a composite contact structure, comprising:
the arc extinguish chamber shell (19) is internally provided with a static contact structure positioned above and a movable contact structure positioned below;
the static contact structure comprises a static main contact (8) and a static arc contact (7) which are in conductive connection, wherein the static main contact (8) is sleeve-shaped, and the static arc contact (7) is movably assembled in the static main contact (8) along the up-down direction;
the moving contact structure comprises a moving main contact (14) and a moving arc contact (11) which are in conductive connection;
the movable main contact (14) and the static main contact (8) are used for normal through-flow, and the movable arc contact (11) and the static arc contact (7) are used for arc extinction;
the static arc contact (7) is arranged in a manner of protruding out of the static main contact (8) along the direction towards the movable contact structure, the movable arc contact (11) is arranged in a manner of protruding out of the movable main contact (14) along the direction towards the static contact structure, during switching-on, the movable arc contact (11) and the static arc contact (7) are in contact with the static main contact (8) before the movable main contact (14), and during switching-off, the movable arc contact (11) and the static arc contact (7) are separated from the movable main contact (14) and the static main contact (8) after the movable main contact (14);
the static contact structure further comprises a static end corrugated pipe (9), the static end corrugated pipe (9) extends in the vertical direction, the static end corrugated pipe (9) is sleeved outside the static arc contact, and the static end corrugated pipe (9) applies elastic reset acting force to the static arc contact so as to force the static arc contact to move towards the moving arc contact (11);
the arc contact is characterized in that the movable main contact (14) is sleeve-shaped, and the movable arc contact (11) is movably assembled in the movable main contact (14) along the up-down direction;
the moving contact structure further comprises a moving end corrugated pipe (13), the moving end corrugated pipe (13) extends in the vertical direction, the moving end corrugated pipe (13) is sleeved outside the moving arc contact (11), and the moving end corrugated pipe (13) applies elastic reset acting force to the moving arc contact (11) to force the moving arc contact to move towards the static arc contact.
2. The vacuum interrupter with a composite contact structure according to claim 1, wherein the moving end bellows (13) is located in the moving main contact (14), one end of the moving end bellows (13) is fixedly connected to the moving main contact (14), and the other end is fixedly connected to the moving arc contact (11).
3. The vacuum arc-extinguishing chamber with the composite contact structure according to claim 2, characterized in that the upper end of the moving end corrugated pipe (13) is fixedly connected with the moving arcing contact (11), the lower end of the moving end corrugated pipe is fixedly connected with the moving main contact (14), the lower end of the moving main contact (14) is fixedly connected with the moving conductive rod (16), and the moving end corrugated pipe (13) is always in a compressed state when the moving conductive rod (16) drives the moving main contact (14) and the moving arcing contact (11) to move up and down to realize the opening and closing operation.
4. The vacuum interrupter with composite contact structure as claimed in claim 3, wherein the moving main contact is provided with a lower assembling groove, and the lower end of the moving end bellows (13) is welded and connected to the bottom of the lower assembling groove.
5. Vacuum interrupter with composite contact structure according to any of claims 1 to 4, characterized in that one of the stationary main contact (8) and the moving main contact (14) has a conical outer circumferential surface (81) and the other main contact has a conical recess (142), which conical recess (142) has a conical inner circumferential surface, which conical inner circumferential surface is adapted to fit with the conical outer circumferential surface (81) during closing in order to achieve normal through-flow.
6. Vacuum interrupter with composite contact structure according to claim 5, characterized in that the respective main contact of the stationary main contact (8) and the moving main contact (14) with the conical recess (142) comprises a plurality of contact lobes (141), all contact lobes (141) being evenly distributed at circumferential intervals, the inner side faces of all contact lobes (141) cooperating to form the conical inner circumferential surface.
7. Vacuum interrupter with composite contact structure according to claim 6, characterized in that the respective main contacts of the static main contact (8) and the dynamic main contact (14) with the conical recess (142) are jacketed with a contact shield (12).
8. Vacuum interrupter with composite contact structure according to one of the claims 1 to 4, it is characterized in that the upper end of the static main contact (8) is fixedly provided with a static supporting conductor (6), the static supporting conductor (6) is in a sleeve shape, the arc extinguish chamber shell (19) comprises an upper sealing cover (5), the static supporting conductor (6) is fixedly assembled with the upper sealing cover (5), the static conductive sleeve (1) is fixedly inserted in the static supporting conductor (6) in a conductive manner, the static arc contact (7) comprises an upper head part (71) and an upper rod part (72), the upper head part (71) is used for being in conductive contact with the moving arc contact (11), the upper rod part (72) is inserted in the static conductive sleeve (1) in a guiding and sliding way, and a static end conductive contact finger (3) is arranged in the static conductive sleeve (1), and the static end conductive contact finger (3) is in sliding conductive fit with the upper rod part (72).
9. The vacuum interrupter with the composite contact structure according to any one of claims 1 to 4, wherein a movable conducting rod (16) is fixedly connected to a lower end of the movable main contact (14), the interrupter housing (19) includes a lower cover (17), the movable conducting rod (16) hermetically slides through the lower cover (17), a lower bellows (15) is sleeved outside the movable conducting rod (16), a lower end of the lower bellows (15) is fixedly connected to the lower cover (17), an upper end of the lower bellows is fixedly connected to the movable conducting rod (16) or the movable main contact (14), the movable conducting rod (16) is in a sleeve shape, the movable arcing contact (11) includes a lower head portion (111) and a lower rod portion (112), the lower head portion (111) is used for electrically contacting the stationary arcing contact, the lower rod portion (112) is slidably inserted into the movable conducting rod (16), and a movable end conducting finger is disposed in the movable conducting rod (16), the movable end conductive contact finger is in sliding conductive fit with the lower rod part (112).
10. The vacuum interrupter with the composite contact structure according to claim 9, wherein the movable conducting rod (16) comprises an upper connecting pipe section and a lower conducting pipe section (18) which are connected by welding, the upper connecting pipe section is fixedly connected with the lower end of the movable main contact (14), the movable end conductive contact finger is arranged on the inner side of the lower conducting pipe section (18), the lower rod portion (112) is in guiding fit with the upper connecting pipe section and/or the lower conducting pipe section (18), the upper connecting pipe section has a guiding fit section for guiding and sealing fit with the lower sealing cover (17), so that the butt joint of the upper connecting pipe section and the lower conducting pipe section (18) can move to the position below the lower sealing cover (17) to be assembled by welding outside the vacuum interrupter.
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| CN202011381558.0A CN112735901B (en) | 2020-12-01 | 2020-12-01 | Vacuum arc-extinguishing chamber with composite contact structure |
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| CN202011381558.0A CN112735901B (en) | 2020-12-01 | 2020-12-01 | Vacuum arc-extinguishing chamber with composite contact structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114360946A (en) * | 2021-12-07 | 2022-04-15 | 平高集团有限公司 | Single-action arc extinguish chamber and static end contact structure thereof |
| WO2023042163A1 (en) * | 2021-09-20 | 2023-03-23 | 郑宇程 | Contactor |
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|---|---|
| CN112735901B (en) | 2023-02-17 |
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Inventor after: Li Xuxu Inventor after: Liu Qing Inventor after: Wang Xiangke Inventor after: Yang Fan Inventor after: Xu Fugang Inventor after: Wang Jing Inventor after: Yang Guang Inventor after: Xue Congjun Inventor after: Qi Dacui Inventor after: Zhao Fangshuai Inventor after: Li Xiaozhao Inventor after: Bi Yinghua Inventor after: Liu Yingying Inventor after: Wang Fuya Inventor after: Liu Wenkui Inventor after: Wang Mingfei Inventor after: Liu Xianbao Inventor after: Pang Sumin Inventor after: Li Xiao Inventor after: Zhang Hang Inventor after: Li Xinwei Inventor after: Guan Xin Inventor after: Tan Shengwu Inventor after: Sun Guanglei Inventor after: He Chuangwei Inventor after: Lin Lin Inventor after: Lu Jing Inventor after: Ma Chaoyang Inventor after: Li Yonglin Inventor before: Li Xuxu Inventor before: Liu Qing Inventor before: Wang Xiangke Inventor before: Yang Fan Inventor before: Xu Fugang Inventor before: Wang Jing Inventor before: Yang Guang Inventor before: Xue Congjun Inventor before: Qi Dacui Inventor before: Zhao Fangshuai Inventor before: Li Xiaozhao Inventor before: Bi Yinghua Inventor before: Liu Yingying Inventor before: Wang Fuya Inventor before: Liu Wenkui Inventor before: Wang Mingfei Inventor before: Liu Xianbao Inventor before: Pang Sumin Inventor before: Li Xiao Inventor before: Zhang Hang Inventor before: Li Xinwei Inventor before: Guan Xin Inventor before: Tan Shengwu Inventor before: Sun Guanglei Inventor before: He Chuangwei Inventor before: Lin Lin Inventor before: Lu Jing Inventor before: Ma Chaoyang Inventor before: Li Yonglin |
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