CN113838701A - Vacuum arc extinguish chamber and vacuum circuit breaker - Google Patents

Vacuum arc extinguish chamber and vacuum circuit breaker Download PDF

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Publication number
CN113838701A
CN113838701A CN202110956271.4A CN202110956271A CN113838701A CN 113838701 A CN113838701 A CN 113838701A CN 202110956271 A CN202110956271 A CN 202110956271A CN 113838701 A CN113838701 A CN 113838701A
Authority
CN
China
Prior art keywords
contact
rod
main contact
lever
arc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110956271.4A
Other languages
Chinese (zh)
Inventor
韩书谟
毕迎华
刘庆
李旭旭
谭盛武
赵晓民
李永林
马朝阳
孙广雷
杨帆
何创伟
刘文魁
王铭飞
庞素敏
李潇
刘先保
张航
李新卫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Pinggao Group Co Ltd
Original Assignee
State Grid Corp of China SGCC
Pinggao Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, Pinggao Group Co Ltd filed Critical State Grid Corp of China SGCC
Publication of CN113838701A publication Critical patent/CN113838701A/en
Pending legal-status Critical Current

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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
    • 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
    • H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
    • 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
    • H01H33/666—Operating arrangements

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  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)

Abstract

The invention relates to the technical field of electric vacuum switches, in particular to a vacuum arc-extinguishing chamber and a vacuum circuit breaker, wherein the vacuum arc-extinguishing chamber comprises: a housing; a lower contact bar; a lower main contact; a lower arcing contact; an upper contact bar; a return spring; an upper arcing contact; an upper main contact; when the switch is in the opening state, the lower end surface of the upper main contact is higher than the lower end surface of the upper arc contact; a lever linkage mechanism is arranged between the upper main contact and the upper contact rod, one end of the lever is in transmission connection with the upper main contact, and the other end of the lever is in transmission connection with the upper contact rod, so that the upper main contact is driven to synchronously and reversely move when the upper contact rod moves. Has the advantages that: the lower end faces of the upper main contact and the upper arc contact are staggered up and down, so that the electric arc is difficult to transfer to the upper main contact, and the ablation of the upper main contact is reduced. The upper contact rod and the upper main contact synchronously move in the opposite direction, so that the upper main contact and the lower main contact are quickly contacted and separated, the moving stroke of the lower contact rod can be saved, the switching-on and switching-off time is shortened, the longitudinal size of the vacuum arc-extinguishing chamber is reduced, and the requirement on the output stroke of the operating mechanism is reduced.

Description

Vacuum arc extinguish chamber and vacuum circuit breaker
Technical Field
The invention relates to the technical field of electric vacuum switches, in particular to a vacuum arc extinguish chamber and a vacuum circuit breaker.
Background
The vacuum arc-extinguishing chamber is an important component of the vacuum circuit breaker, and a contact of the vacuum arc-extinguishing chamber needs to conduct rated working current under a normal condition and break fault current under a fault condition, so that the vacuum arc-extinguishing chamber needs to have better breaking capacity.
Chinese utility model patent with publication number CN202307674U discloses a vacuum interrupter and vacuum circuit breaker using the same, which comprises an upper contact composed of an upper end main contact (i.e. an upper main contact) and an upper arc contact, and a lower contact composed of a lower end main contact (i.e. a lower main contact) and a lower arc contact, wherein the upper arc contact and the lower arc contact are made of fusion welding resistant contact materials. The upper arc contact is fixed at the lower end of the upper conducting rod, the upper conducting rod is communicated with the upper main contact through a watchband contact finger on the upper conducting rod, the upper end of the upper conducting rod is provided with a limiting pad, and an upper contact spring is arranged above the limiting pad. The lower arc contact is fixed on the lower main contact which is fixed at the upper end of the lower conducting rod, and the lower conducting rod is connected with the circuit breaker operating mechanism through an insulating pull rod with a main contact spring.
When the switch is switched on, the operating mechanism drives the lower conducting rod, the lower main contact and the lower arc contact to move upwards together until the lower arc contact is contacted with the upper arc contact, then the lower arc contact continues to move upwards together with the upper arc contact, so that an upper contact spring at the upper end of the upper conducting rod is compressed until the upper main contact and the lower main contact start to be contacted, the main contact spring starts to be compressed and is reliably closed under the action of contact pressure, and at the moment, high current is carried by the upper main contact and the lower main contact. When the brake is opened, the compression amount of the main contact spring is released, and the lower conducting rod, the lower main contact and the lower arc contact move downwards under the driving of the operating mechanism, so that the compression amount of the upper contact spring is released. At the moment, the upper conducting rod drives the upper arc contact and the lower arc contact to move downwards together, the upper main contact is separated from the lower main contact, the upper arc contact and the lower arc contact are still in a conducting state, the upper conducting rod and the upper arc contact stop moving downwards until the limiting pad is in contact with the upper end of the vacuum arc-extinguishing chamber for limiting, and at the moment, the lower conducting rod continues to move downwards under the driving of the operating mechanism until the opening is limited, so that the opening action of the circuit breaker is completed.
In the process of opening and closing, electric arcs are generated between the upper arc contact and the lower arc contact, although the upper arc contact and the lower arc contact are made of contact materials resistant to fusion welding, the contact surface is light in burning loss, and the upper end face of the lower arc contact is higher than the upper end face of the lower main contact, when the upper arc contact and the lower arc contact are in an opening state or just closed, the lower end faces of the upper arc contact and the upper main contact are flush, namely the lower end face of the upper arc contact and the lower end face of the upper main contact are not staggered in the vertical direction, so that the generated electric arcs can be easily transferred to the upper main contact, and the upper main contact is ablated.
Aiming at the problems, if the lower end face of the upper main contact is simply moved upwards, or the lower end face of the upper arc contact is moved downwards, the lower end face of the upper arc contact and the lower end face of the upper main contact are staggered in the vertical direction, the lower main contact can be contacted with the upper main contact only by a larger upward movement stroke and can be separated from the upper main contact only by a larger downward movement stroke, namely, the movement stroke of the lower conducting rod is increased, so that the opening and closing time can be prolonged, the longitudinal size of the vacuum arc-extinguishing chamber can be increased, meanwhile, higher requirements are provided for the output stroke of the operating mechanism, and the problem to be solved urgently at present is solved.
Disclosure of Invention
The invention aims to provide a vacuum arc-extinguishing chamber which can reduce the ablation of an upper main contact and can not increase the moving stroke of a lower conducting rod; the invention also aims to provide a vacuum circuit breaker which can reduce the ablation of an upper main contact and can not increase the moving stroke of a lower conducting rod.
In order to achieve the purpose, the vacuum arc extinguish chamber adopts the following technical scheme:
a vacuum interrupter, comprising:
a housing;
the upper end of the lower contact rod extends into the shell, and the lower end of the lower contact rod is used for being in transmission connection with the operating mechanism, so that the lower contact rod can move up and down relative to the shell to realize switching-off and switching-on;
the lower main contact is arranged at the upper end of the lower contact rod;
the lower arc contact is in conductive connection with the lower main contact, and the upper end surface of the lower arc contact is higher than that of the lower main contact;
the lower end of the upper contact rod extends into the shell, and the upper contact rod can be assembled on the shell in a vertically moving mode;
the return spring is used for being stressed and deformed when the upper contact rod moves upwards so as to provide return power for the downward movement of the upper contact rod;
the upper arc contact is arranged at the lower end of the upper contact rod;
the upper main contact is in conductive connection with the upper arc contact;
when the switch is in the opening state, the lower end surface of the upper main contact is higher than the lower end surface of the upper arc contact; a lever linkage mechanism is arranged between the upper main contact and the upper contact rod and comprises a lever, one end of the lever is in transmission connection with the upper main contact, and the other end of the lever is in transmission connection with the upper contact rod, so that the upper main contact is driven by the lever linkage mechanism to synchronously and reversely move when the upper contact rod moves up and down.
The beneficial effects of the above technical scheme are that: when the switch is switched off, the lower end surface of the upper main contact is higher than the lower end surface of the upper arc contact, namely the lower end surface of the upper main contact and the lower end surface of the upper arc contact are staggered in the vertical direction, and the lower end surface of the upper main contact is far away from the lower end surface of the upper arc contact, so that electric arcs generated between the upper arc contact and the lower arc contact are difficult to transfer to the upper main contact in the switching-off and switching-on processes, and the ablation of the upper main contact can be reduced.
Meanwhile, because a lever linkage mechanism is arranged between the upper main contact and the upper contact rod, the lever linkage mechanism comprises a lever, one end of the lever is in transmission connection with the upper main contact, the other end of the lever is in transmission connection with the upper contact rod, and the lever plays a role of reversing, so that the upper main contact can be driven by the lever linkage mechanism to synchronously and reversely move when the upper contact rod moves up and down, namely, when the switch is switched on, the upper contact rod moves upwards under the pushing of the lower contact rod, and the upper main contact can synchronously move downwards so as to be rapidly contacted with the lower main contact, and the upward moving stroke of the lower contact rod is saved, so that the switch-on time can be shortened, the longitudinal size of the vacuum arc-extinguishing chamber can be reduced, and the requirement on the output stroke of the operating mechanism can be reduced.
Conversely, when the brake is opened, the upper contact rod moves downwards under the action of the reset spring to reset, and the upper main contact moves upwards under the action of the lever linkage mechanism, so that the upper main contact can be separated from the lower main contact quickly, the downward movement stroke of the lower contact rod is saved, and the brake opening time can be shortened. And in the upward moving process of the upper main contact, the lower end surface of the upper main contact and the lower end surface of the upper arc contact are quickly separated in the vertical direction, so that at the moment that the upper arc contact and the lower arc contact are separated, the lower end surface of the upper main contact is moved to the upper side of the lower end surface of the upper arc contact, electric arcs generated between the upper arc contact and the lower arc contact are not easily transferred to the upper main contact, and the ablation of the upper main contact is reduced.
Further, the upper main contact is provided outside the upper arcing contact for ease of arrangement and assembly.
Furthermore, in order to facilitate the setting and installation of the upper main contact, the upper end of the shell is provided with an upper cover plate, a conductive tube which extends up and down and the lower end of which extends into the shell is fixed on the upper cover plate, the upper main contact is arranged outside the conductive tube and is in sliding contact conductive fit with the outer wall of the conductive tube, and the upper contact rod penetrates through the conductive tube up and down.
Furthermore, in order to facilitate the arrangement and assembly of the lever linkage mechanism, the lever linkage mechanism further comprises a barrel body arranged above the shell, the barrel body is provided with a barrel body bottom wall and a barrel body side wall, the barrel body bottom wall is fixedly connected with the top end of the conductive tube, the top end of the upper contact rod extends into the barrel body, the lever is rotatably installed in the barrel body, the lever linkage mechanism further comprises a linkage rod, one end of the linkage rod is connected with the upper main contact, the other end of the linkage rod penetrates through the upper cover plate and the barrel body bottom wall to extend into the barrel body, one end of the lever is in transmission connection with the linkage rod, and the other end of the lever is in transmission connection with the upper contact rod.
Furthermore, in order to conveniently realize the conductive connection between the upper contact rod and the upper main contact, the upper contact rod and the conductive tube are in clearance fit, a conductive block is fixed on the bottom wall of the cylinder body in the cylinder body, the upper end of the upper contact rod penetrates through the conductive block, the upper contact rod is in plug-in conductive fit with the conductive block, and the conductive block is in conductive connection with the conductive tube through the bottom wall of the cylinder body.
Furthermore, in order to facilitate the transmission connection between the upper contact rod and the lever, the upper end of the upper contact rod is connected with a gland, and the gland is in transmission connection with the lever.
Furthermore, transition connecting rods are respectively connected between the pressing covers and the levers and between the linkage rods and the levers, so that the levers are prevented from being fixed in order to facilitate the movement of the levers.
Furthermore, in order to facilitate the movement of the gland, the gland is sleeved outside the conductive block, and the gland and the conductive block are in guiding sliding fit in the up-down direction.
Furthermore, in order to facilitate the arrangement of the return spring, a fixing plate is fixedly arranged in the cylinder, the fixing plate is positioned above the gland, a stop post extending downwards is fixed on the fixing plate, the lower end face of the stop post is used for being matched with the upper end face of the gland in a stop manner during closing, the return spring is sleeved on the stop post, one end of the return spring is pressed on the fixing plate, and the other end of the return spring is pressed on the gland.
In order to achieve the purpose, the vacuum circuit breaker adopts the following technical scheme:
a vacuum circuit breaker, includes operating mechanism and the vacuum interrupter who links to each other with operating mechanism, and the vacuum interrupter includes:
a housing;
the upper end of the lower contact rod extends into the shell, and the lower end of the lower contact rod is used for being in transmission connection with the operating mechanism, so that the lower contact rod can move up and down relative to the shell to realize switching-off and switching-on;
the lower main contact is arranged at the upper end of the lower contact rod;
the lower arc contact is in conductive connection with the lower main contact, and the upper end surface of the lower arc contact is higher than that of the lower main contact;
the lower end of the upper contact rod extends into the shell, and the upper contact rod can be assembled on the shell in a vertically moving mode;
the return spring is used for being stressed and deformed when the upper contact rod moves upwards so as to provide return power for the downward movement of the upper contact rod;
the upper arc contact is arranged at the lower end of the upper contact rod;
the upper main contact is in conductive connection with the upper arc contact;
when the switch is in the opening state, the lower end surface of the upper main contact is higher than the lower end surface of the upper arc contact; a lever linkage mechanism is arranged between the upper main contact and the upper contact rod and comprises a lever, one end of the lever is in transmission connection with the upper main contact, and the other end of the lever is in transmission connection with the upper contact rod, so that the upper main contact is driven by the lever linkage mechanism to synchronously and reversely move when the upper contact rod moves up and down.
The beneficial effects of the above technical scheme are that: when the switch is switched off, the lower end surface of the upper main contact is higher than the lower end surface of the upper arc contact, namely the lower end surface of the upper main contact and the lower end surface of the upper arc contact are staggered in the vertical direction, and the lower end surface of the upper main contact is far away from the lower end surface of the upper arc contact, so that electric arcs generated between the upper arc contact and the lower arc contact are difficult to transfer to the upper main contact in the switching-off and switching-on processes, and the ablation of the upper main contact can be reduced.
Meanwhile, because a lever linkage mechanism is arranged between the upper main contact and the upper contact rod, the lever linkage mechanism comprises a lever, one end of the lever is in transmission connection with the upper main contact, the other end of the lever is in transmission connection with the upper contact rod, and the lever plays a role of reversing, so that the upper main contact can be driven by the lever linkage mechanism to synchronously and reversely move when the upper contact rod moves up and down, namely, when the switch is switched on, the upper contact rod moves upwards under the pushing of the lower contact rod, and the upper main contact can synchronously move downwards so as to be rapidly contacted with the lower main contact, and the upward moving stroke of the lower contact rod is saved, so that the switch-on time can be shortened, the longitudinal size of the vacuum arc-extinguishing chamber can be reduced, and the requirement on the output stroke of the operating mechanism can be reduced.
Conversely, when the brake is opened, the upper contact rod moves downwards under the action of the reset spring to reset, and the upper main contact moves upwards under the action of the lever linkage mechanism, so that the upper main contact can be separated from the lower main contact quickly, the downward movement stroke of the lower contact rod is saved, and the brake opening time can be shortened. And in the upward moving process of the upper main contact, the lower end surface of the upper main contact and the lower end surface of the upper arc contact are quickly separated in the vertical direction, so that at the moment that the upper arc contact and the lower arc contact are separated, the lower end surface of the upper main contact is moved to the upper side of the lower end surface of the upper arc contact, electric arcs generated between the upper arc contact and the lower arc contact are not easily transferred to the upper main contact, and the ablation of the upper main contact is reduced.
Further, the upper main contact is provided outside the upper arcing contact for ease of arrangement and assembly.
Furthermore, in order to facilitate the setting and installation of the upper main contact, the upper end of the shell is provided with an upper cover plate, a conductive tube which extends up and down and the lower end of which extends into the shell is fixed on the upper cover plate, the upper main contact is arranged outside the conductive tube and is in sliding contact conductive fit with the outer wall of the conductive tube, and the upper contact rod penetrates through the conductive tube up and down.
Furthermore, in order to facilitate the arrangement and assembly of the lever linkage mechanism, the lever linkage mechanism further comprises a barrel body arranged above the shell, the barrel body is provided with a barrel body bottom wall and a barrel body side wall, the barrel body bottom wall is fixedly connected with the top end of the conductive tube, the top end of the upper contact rod extends into the barrel body, the lever is rotatably installed in the barrel body, the lever linkage mechanism further comprises a linkage rod, one end of the linkage rod is connected with the upper main contact, the other end of the linkage rod penetrates through the upper cover plate and the barrel body bottom wall to extend into the barrel body, one end of the lever is in transmission connection with the linkage rod, and the other end of the lever is in transmission connection with the upper contact rod.
Furthermore, in order to conveniently realize the conductive connection between the upper contact rod and the upper main contact, the upper contact rod and the conductive tube are in clearance fit, a conductive block is fixed on the bottom wall of the cylinder body in the cylinder body, the upper end of the upper contact rod penetrates through the conductive block, the upper contact rod is in plug-in conductive fit with the conductive block, and the conductive block is in conductive connection with the conductive tube through the bottom wall of the cylinder body.
Furthermore, in order to facilitate the transmission connection between the upper contact rod and the lever, the upper end of the upper contact rod is connected with a gland, and the gland is in transmission connection with the lever.
Furthermore, transition connecting rods are respectively connected between the pressing covers and the levers and between the linkage rods and the levers, so that the levers are prevented from being fixed in order to facilitate the movement of the levers.
Furthermore, in order to facilitate the movement of the gland, the gland is sleeved outside the conductive block, and the gland and the conductive block are in guiding sliding fit in the up-down direction.
Furthermore, in order to facilitate the arrangement of the return spring, a fixing plate is fixedly arranged in the cylinder, the fixing plate is positioned above the gland, a stop post extending downwards is fixed on the fixing plate, the lower end face of the stop post is used for being matched with the upper end face of the gland in a stop manner during closing, the return spring is sleeved on the stop post, one end of the return spring is pressed on the fixing plate, and the other end of the return spring is pressed on the gland.
Drawings
Fig. 1 is a schematic structural view (open state) of embodiment 1 of the vacuum interrupter according to the present invention;
fig. 2 is a schematic structural view (just closed state) of embodiment 1 of the vacuum interrupter according to the present invention;
fig. 3 is a schematic structural view (closing state) of embodiment 1 of the vacuum interrupter according to the present invention;
FIG. 4 is an enlarged view of the upper structure of FIG. 1;
fig. 5 is a schematic structural view (open state) of embodiment 2 of the vacuum interrupter according to the present invention;
FIG. 6 is a schematic structural view (just closed state) of embodiment 2 of the vacuum interrupter according to the present invention;
fig. 7 is a schematic structural view (closing state) of embodiment 2 of the vacuum interrupter according to the present invention;
FIG. 8 is an enlarged fragmentary view of the upper insulating ring portion of FIG. 5;
fig. 9 is a partially enlarged view of a portion of the lower insulating ring of fig. 5.
In the figure: 1-a first bellows; 2-a conductive tube; 3-upper main contact; 4-upper arc contact; 5-lower arc contact; 6-lower contact bar; 61-a boss; 7-lower cover plate; 8-a second bellows; 9-a housing; 10-lower main contact; 11-a shield; 12-a third bellows; 13-upper contact bar; 14-a linkage bar; 15-upper cover plate; 16-lever structure; 161-a first transition link; 162-a lever; 163-a second transition link; 164-a mounting rod; 17-a cylinder body; 18-a return spring; 19-a conductive block; 20-pressing the cover; 21-a stop column; 22-a fixing plate; 23-fixing columns; 24-patch panel; 25-an upper insulating ring; 26-a stop cylinder; 27-a compression spring; 28-lower insulating ring.
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, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
As shown in fig. 1, 2 and 3, an embodiment 1 of the vacuum interrupter according to the present invention includes a housing 9, wherein an upper cover plate 15 is disposed at an upper end of the housing 9, and a lower cover plate 7 is disposed at a lower end of the housing 9. The upper cover plate 15 is fixed with a conductive tube 2 which extends up and down and the lower end of which extends into the shell 9, the upper contact rod 13 penetrates through the conductive tube 2 up and down, and the upper contact rod 13 is in clearance fit with the conductive tube 2. An upper arc contact 4 is fixed at the lower end of the upper contact rod 13, a third corrugated pipe 12 is sleeved outside the upper contact rod 13, and the upper end of the third corrugated pipe 12 is connected to the upper end and the lower end of the conductive pipe 2 and connected to the upper arc contact 4.
An upper main contact 3 is arranged outside the conductive tube 2, the upper main contact 3 is of a cylindrical structure, the upper main contact 3 is located on the outer side of an upper arc contact 4, and the upper end of the upper main contact 3 is in sliding contact conductive fit with the outer wall of the conductive tube 2 in the up-down direction. In the opening state, the lower end surface of the upper main contact 3 is higher than the lower end surface of the upper arc contact 4.
A lever linkage mechanism is arranged between the upper main contact 3 and the upper contact rod 13 and used for enabling the upper main contact 3 and the upper contact rod 13 to synchronously and reversely move, the lever linkage mechanism comprises a linkage rod 14, a cylinder body 17 and a lever structure 16, wherein the cylinder body 17 is arranged above the shell 9, the cylinder body 17 is provided with a cylinder body bottom wall and a cylinder body side wall, the cylinder body bottom wall is fixedly connected with the top end of the conductive tube 2, the cylinder body 17 is made of conductive materials, and the top end of the cylinder body side wall is provided with a wiring board 24.
The linkage rods 14 are arranged symmetrically left and right, the linkage rods 14 penetrate through the upper cover plate 15 and the bottom wall of the barrel, the lower ends of the linkage rods 14 extend into the shell 9 and are fixedly connected with the upper main contact 3, the upper ends of the linkage rods 14 extend into the barrel 17, a first corrugated pipe 1 is arranged in the shell 9, one end of the first corrugated pipe 1 is connected to the linkage rods 14, and the other end of the first corrugated pipe 1 is connected to the upper cover plate 15.
As shown in fig. 4, a conductive block 19 is fixed on the bottom wall of the cylinder in the cylinder 17, the upper end of the upper contact rod 13 penetrates through the bottom wall of the cylinder and is inserted into the conductive block 19, the upper contact rod 13 and the conductive block 19 are in insertion conductive fit, and the conductive block 19 is in conductive connection with the conductive tube 2 through the bottom wall of the cylinder, so that the upper arcing contact 4 is indirectly in conductive connection with the upper main contact 3 through the upper contact rod 13, the conductive block 19, the bottom wall of the cylinder and the conductive tube 2 in sequence.
The upper end of the upper contact rod 13 is connected with a gland 20, the gland 20 is sleeved outside the conductive block 19, and the gland 20 and the conductive block 19 are in guiding sliding fit in the vertical direction. A fixing plate 22 is fixedly arranged in the cylinder 17 through a fixing column 23, the fixing plate 22 is positioned above the gland 20, a stop column 21 extending downwards is fixed on the fixing plate 22, and the lower end surface of the stop column 21 is used for being matched with the upper end surface of the gland 20 in a stopping way during closing, so that a gap is formed between the lower end surface of the stop column 21 and the upper end surface of the gland 20 during opening. The outside of the stop column 21 is sleeved with a return spring 18, one end of the return spring 18 is pressed against the fixing plate 22, and the other end is pressed against the gland 20. When the switch is closed, the upper contact rod 13 moves upwards to drive the gland 20 to compress the return spring 18 so as to deform the return spring under stress, so that the downward movement of the upper contact rod 13 can be provided with return power.
As shown in fig. 4, the lever structure 16 includes a first transition link 161, a lever 162, and a second transition link 163, a mounting rod 164 is fixedly disposed on the bottom wall of the cylinder, the lever 162 is rotatably mounted on the mounting rod 164, one end of the first transition link 161 is hinged to the gland 20, the other end is hinged to one end of the lever 162, one end of the second transition link 163 is hinged to the linkage rod 14, and the other end is hinged to one end of the lever 162, so that when the upper contact rod 13 drives the gland 20 to move upward, the first transition link 161 drives the lever 162 to rotate, the lever 162 drives the second transition link 163 to move, and further drives the linkage rod 14 to move, and the movement directions of the upper contact rod 13 and the linkage rod 14 are opposite through the direction reversal of the lever 162.
In this embodiment, the first transition link 161 and the second transition link 163 are disposed, and the second transition link 163 is curved (according to the use requirement, the first transition link 161 may also be curved), so as to adapt to the smooth rotation of the lever 162 and avoid the lever 162 from being dead, otherwise, a long hole structure needs to be disposed between the lever 162 and the gland 20 and between the lever 162 and the linkage rod 14, which is complicated in structure and inconvenient to process. Meanwhile, after two transition connecting rods are adopted, the distance between the two linkage rods 14 can be reduced, and the transverse size of the arc extinguish chamber is reduced.
As shown in fig. 1, 2 and 3, the lower contact rod 6 has an upper end extending into the housing 9 and a lower end for driving connection with an actuator (not shown), so that the lower contact rod 6 can move up and down relative to the housing 9. A second bellows 8 is provided in the housing 9, and the upper end of the second bellows 8 is connected to the lower contact rod 6 and the lower end thereof is connected to the lower cover plate 7. The upper end of the lower contact rod 6 is fixed with a lower arcing contact 5 and a lower main contact 10. Further, a shield shell 11 is fixed to an inner wall of the housing 9, and the shield shell 11 corresponds to contact positions of the upper main contact 3 and the lower main contact 10, and the upper arcing contact 4 and the lower arcing contact 5.
The lower arcing contact 5 is fixed on the upper end face of the lower contact rod 6 and is in butt contact with the upper arcing contact 4. The lower main contact 10 is also of a cylindrical structure, the lower end of the lower main contact is fixed on the outer wall of the lower contact rod 6, the lower main contact 10 is positioned at the outer side of the lower arcing contact 5, and the upper end face of the lower arcing contact 5 is higher than the upper end face of the lower main contact 10. The outer diameter of the lower main contact 10 is smaller than the inner diameter of the upper main contact 3, and the inner hole of the upper main contact 3 forms a jack for inserting the lower main contact 10 and realizing the plug-in contact and conduction of the lower main contact and the upper main contact.
When the vacuum arc-extinguishing chamber works, fig. 1 shows that the vacuum circuit breaker is in an opening state, fig. 2 shows a closing state, and fig. 3 shows a closing state. In the closing process, under the action of the operating mechanism, the lower contact rod 6 drives the lower arc contact 5 and the lower main contact 10 to move upwards until the upper and lower arc contacts move to the rigid closing state, as shown in fig. 2, at this time, the current flows from the conductive block 19 to the upper contact rod 13, and then to the upper arc contact 4, the lower arc contact 5 and the lower contact rod 6. Thereafter, the lower contact rod 6 continues to move upwards, so that the upper arcing contact 4 is pushed to move upwards, the upper arcing contact 4 drives the upper contact rod 13 to move upwards, the pressing cover 20 is further driven to move upwards, the linkage rod 14 moves downwards under the action of the lever structure 16, the upper main contact 3 is driven to move downwards, in the process, the reset spring 18 is compressed, the upper main contact 3 and the lower main contact 10 start to be in plug-in contact and conduct electricity until the pressing cover 20 and the stopping column 21 are in stopping fit, at the moment, the upper main contact 3 and the lower main contact 10 are completely switched on, a conducting loop is completely communicated, and at the moment, current flows from the wiring board 24 to the cylinder 17 to the conducting tube 2, the upper main contact 3, the lower main contact 10 and the lower contact rod 6.
In the process of opening the brake, under the action of a return spring 18, an upper arc contact 4 and an upper contact rod 13 move downwards, under the action of a lever structure 16, a linkage rod 14 drives an upper main contact 3 to move upwards until the upper main contact and the lower main contact are completely separated, a conductive loop is disconnected, the upper arc contact and the lower arc contact are separated subsequently, and the upper contact and the lower contact return to the state of opening the brake.
When the vacuum arc-extinguishing chamber is in a brake-off state, the lower end surface of the upper main contact 3 is higher than the lower end surface of the upper arc contact 4, namely the lower end surface of the upper main contact 3 and the lower end surface of the upper arc contact 4 are staggered in the vertical direction by a distance, and the lower end surface of the upper main contact 3 is far away from the lower end surface of the upper arc contact 4; meanwhile, the upper end face of the lower arc contact 5 is higher than the upper end face of the lower main contact 10, namely the upper end face of the lower arc contact 5 and the upper end face of the lower main contact 10 are staggered in the vertical direction, so that in the switching-on and switching-off process, an electric arc generated between the upper arc contact 4 and the lower arc contact 5 is difficult to transfer to the upper main contact 3 and the lower main contact 10, ablation of the upper main contact 3 and the lower main contact 10 can be reduced, and the main contacts are protected.
Meanwhile, because the lever linkage mechanism is arranged between the upper main contact 3 and the upper contact rod 13, a lever in the lever linkage mechanism has a reversing effect, and can drive the upper main contact 3 to synchronously and reversely move when the upper contact rod 13 moves up and down, namely, when the switch is switched on, when the upper contact rod 13 moves up under the pushing of the lower contact rod 6, the upper main contact 3 synchronously moves down, so that the upper main contact can be quickly contacted with the lower main contact 10, and the upward moving stroke of the lower contact rod 6 is saved, therefore, the switch-on time can be shortened, the longitudinal size of the vacuum arc-extinguishing chamber can be reduced, and meanwhile, the requirement on the output stroke of the operating mechanism can be reduced.
Conversely, during opening, the upper contact rod 13 moves downwards under the action of the return spring 18 to be reset, and the upper main contact 3 moves upwards under the action of the lever linkage mechanism, so that the upper main contact can be quickly separated from the lower main contact 10, the downward movement stroke of the lower contact rod 6 is saved, and the opening time can be shortened. And in the upward movement process of the upper main contact 3, the lower end surface of the upper main contact 3 and the lower end surface of the upper arc contact 4 are quickly separated in the vertical direction, so that at the moment that the upper arc contact 4 and the lower arc contact 5 are separated, the lower end surface of the upper main contact 3 is moved to the upper side of the lower end surface of the upper arc contact 4, electric arcs generated between the upper arc contact 4 and the lower arc contact 5 are not easily transferred to the upper main contact 3, the time of electric arcs diffusing to the upper main contact 3 is prolonged, and the ablation of the upper main contact 3 is reduced.
In addition, because the lower arcing contact 5 and the upper arcing contact 4 are in butt contact, after the lower arcing contact 5 is in contact with the upper arcing contact 4, the lower arcing contact 5 can push the upper arcing contact 4 to continue moving upwards, so that the return spring 18 is stressed and deformed to provide return power for the downward movement of the upper contact rod 13. And the lower main contact 10 and the upper main contact 3 are in plug contact, the plug contact depends on the contact conduction between an inner hole and an outer wall, and joint pressure is not required to be applied in the up-down direction, so that compared with the prior art, a main contact spring at the outer side of a movable end of the arc extinguish chamber can be omitted, the structure at the outer side of the arc extinguish chamber can be simplified, and meanwhile, the operating mechanism does not need to compress the main contact spring again, so that the operating power can be reduced.
Embodiment 2 of the vacuum interrupter in the present invention is shown in fig. 5, 6 and 7, and the main differences between this embodiment and embodiment 1 are: as shown in fig. 8, in the open state, the upper end of the upper main contact 3 is in contact with the upper insulating ring 25, that is, the upper main contact 3 is temporarily not in conduction with the outer wall of the contact tube 2.
In addition, in the present embodiment, the lower main contact 10 and the lower contact rod 6 are in sliding contact and conductive engagement, the lower contact rod 6 is provided with a boss 61, the outer portion of the lower contact rod 6 is sleeved with a compression spring 27, the upper end of the compression spring 27 presses against the boss 61, the upper end and the lower end of the lower main contact 10, and as shown in fig. 9, the lower insulating ring 28 is fixed on the lower contact rod 6, and in the opening state, the lower main contact 10 contacts with the lower insulating ring 28, that is, the lower main contact 10 is temporarily not conducted with the lower contact rod 6.
The working principle of this embodiment is basically the same as that of embodiment 1, except that due to the arrangement of the upper insulating ring 25, the lower insulating ring 28 and the stop cylinder 26, the lower main contact 10 will contact the stop cylinder 26 during the upward movement, and thereafter the lower main contact 10 cannot move upward, but the lower contact rod 6 still moves upward, so that the lower main contact 10 moves downward relative to the lower contact rod 6 until the position of the lower insulating ring 28 is passed, and the lower main contact 10 can not be conducted with the lower contact rod 6. Similarly, the upper main contact 3 also needs to go over the upper insulating ring 25 to be conducted with the conductive tube 2 during the downward movement. Therefore, the upper main contact and the lower main contact in the embodiment can be conducted with the main circuit after being jointed for a period of time and disconnected with the main circuit before being separated, and contact ablation caused by arc current transfer is further avoided.
In other embodiments of the vacuum interrupter, the fixing plate and the stop post may not be disposed in the cylinder, and the return spring may be connected between the pressing cover and the bottom wall of the cylinder, and the return spring provides the return power by tensile deformation, or the return spring may be disposed in the housing, for example, between the conductive tube and the upper arc contact.
In other embodiments of the vacuum interrupter, the gland does not have to be guided into engagement with the conductive block, and the gland is simply disposed above the conductive block.
In other embodiments of the vacuum arc-extinguishing chamber, no transition connecting rod is arranged between the gland and the lever and between the linkage rod and the lever, and at this time, a long hole structure is required to be arranged on the lever to prevent the lever from being dead.
In other embodiments of the vacuum interrupter, the upper end of the upper contact rod may not be provided with a gland, but may be directly in transmission connection with the lever structure.
In other embodiments of the vacuum arc-extinguishing chamber, the cylinder body can be not provided with a conductive block, the upper contact rod can be directly in plug-in conductive contact with the conductive tube, and the upper end of the upper contact rod is directly in transmission connection with the lever structure.
In other embodiments of the vacuum interrupter, the lever linkage may not include the cylinder, and the lever may be rotatably mounted above the housing, for example, the lever may be rotatably mounted on the upper cover plate, and the lever may be rotatably mounted on the mounting rod.
In other embodiments of the vacuum arc-extinguishing chamber, the lever can also be rotatably installed in the housing, at this time, an installation structure for installing the lever needs to be fixed on the inner wall of the housing, and a connection structure connected with the lever structure needs to be arranged on the upper contact rod, so that the linkage rod can be omitted under the condition that the upper main contact structure is suitable, and the linkage rod can be directly connected with the lever structure.
In other embodiments of the vacuum interrupter, the conductive tube may not be provided, so that the upper main contact is directly in sliding contact conductive engagement with the outer wall of the upper contact rod.
In other embodiments of the vacuum arc-extinguishing chamber, the upper main contact may also be disposed inside the upper arcing contact, and the lower main contact is disposed inside the lower arcing contact, and the upper end surface of the lower arcing contact is higher than the upper end surface of the lower main contact.
In other embodiments of the vacuum interrupter, the inner diameter of the lower main contact may be sized to be larger than the outer diameter of the upper main contact, so that the upper main contact is inserted into the lower main contact, i.e., the lower main contact is provided with the insertion hole.
In other embodiments of the vacuum interrupter, the upper main contact and the lower main contact can also be arranged to be electrically conductive to the contact contacts, as is known in the art.
The embodiment of the vacuum circuit breaker in the invention is as follows: the vacuum circuit breaker comprises an operating mechanism and a vacuum arc-extinguishing chamber connected with the operating mechanism, and the structure of the vacuum arc-extinguishing chamber is the same as that of the vacuum arc-extinguishing chamber in the embodiment, and the description is not repeated.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.

Claims (10)

1. A vacuum interrupter, comprising:
a housing;
the upper end of the lower contact rod extends into the shell, and the lower end of the lower contact rod is used for being in transmission connection with the operating mechanism, so that the lower contact rod can move up and down relative to the shell to realize switching-off and switching-on;
the lower main contact is arranged at the upper end of the lower contact rod;
the lower arc contact is in conductive connection with the lower main contact, and the upper end surface of the lower arc contact is higher than that of the lower main contact;
the lower end of the upper contact rod extends into the shell, and the upper contact rod can be assembled on the shell in a vertically moving mode;
the return spring is used for being stressed and deformed when the upper contact rod moves upwards so as to provide return power for the downward movement of the upper contact rod;
the upper arc contact is arranged at the lower end of the upper contact rod;
the upper main contact is in conductive connection with the upper arc contact;
the method is characterized in that: when the switch is in the opening state, the lower end surface of the upper main contact is higher than the lower end surface of the upper arc contact; a lever linkage mechanism is arranged between the upper main contact and the upper contact rod and comprises a lever, one end of the lever is in transmission connection with the upper main contact, and the other end of the lever is in transmission connection with the upper contact rod, so that the upper main contact is driven by the lever linkage mechanism to synchronously and reversely move when the upper contact rod moves up and down.
2. Vacuum interrupter according to claim 1, characterized in that: the upper main contact is arranged outside the upper arcing contact.
3. Vacuum interrupter according to claim 2, characterized in that: the upper end of the shell is provided with an upper cover plate, a conductive tube which extends up and down and the lower end of which extends into the shell is fixed on the upper cover plate, an upper main contact is arranged outside the conductive tube and is in sliding contact conductive fit with the outer wall of the conductive tube, and an upper contact rod penetrates through the conductive tube up and down.
4. Vacuum interrupter according to claim 3, characterized in that: the lever linkage mechanism further comprises a barrel body arranged above the shell, the barrel body is provided with a barrel body bottom wall and a barrel body side wall, the barrel body bottom wall is fixedly connected with the top end of the conductive tube, the top end of the upper contact rod extends into the barrel body, the lever is rotatably installed in the barrel body, the lever linkage mechanism further comprises a linkage rod, one end of the linkage rod is connected with the upper main contact, the other end of the linkage rod penetrates through the upper cover plate and the barrel body bottom wall to extend into the barrel body, one end of the lever is in transmission connection with the linkage rod, and the other end of the lever is in transmission connection with the upper contact rod.
5. Vacuum interrupter according to claim 4, characterized in that: go up clearance fit between contact pole and the conducting tube, be fixed with the conducting block on the barrel diapire in the barrel, go up the upper end of contact pole and pass the conducting block, go up contact pole and the conducting block electrically conductive cooperation of pegging graft, the conducting block passes through barrel diapire and conducting tube conductive connection.
6. Vacuum interrupter according to claim 5, characterized in that: the upper end of the upper contact rod is connected with a gland, and the gland is in transmission connection with a lever.
7. Vacuum interrupter according to claim 6, characterized in that: transition connecting rods are respectively connected between the gland and the lever and between the linkage rod and the lever.
8. Vacuum interrupter according to claim 6 or 7, characterized in that: the gland is sleeved outside the conductive block, and the gland and the conductive block are in guiding sliding fit in the up-down direction.
9. Vacuum interrupter according to claim 6 or 7, characterized in that: the cylinder body is internally and fixedly provided with a fixing plate, the fixing plate is positioned above the gland, a stop post extending downwards is fixed on the fixing plate, the lower end face of the stop post is used for being matched with the upper end face of the gland in a stop mode during closing, the reset spring is sleeved on the stop post, one end of the reset spring is pressed on the fixing plate, and the other end of the reset spring is pressed on the gland.
10. The utility model provides a vacuum circuit breaker, includes operating mechanism and the vacuum interrupter who links to each other with operating mechanism which characterized in that: the vacuum interrupter is the same as the vacuum interrupter according to any one of claims 1 to 9.
CN202110956271.4A 2020-11-27 2021-08-19 Vacuum arc extinguish chamber and vacuum circuit breaker Pending CN113838701A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202011357198 2020-11-27
CN2020113571980 2020-11-27

Publications (1)

Publication Number Publication Date
CN113838701A true CN113838701A (en) 2021-12-24

Family

ID=78960848

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110956271.4A Pending CN113838701A (en) 2020-11-27 2021-08-19 Vacuum arc extinguish chamber and vacuum circuit breaker

Country Status (1)

Country Link
CN (1) CN113838701A (en)

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