CN112735900A - Vacuum arc-extinguishing chamber and vacuum circuit breaker using same - Google Patents
Vacuum arc-extinguishing chamber and vacuum circuit breaker using same Download PDFInfo
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- CN112735900A CN112735900A CN202011363367.1A CN202011363367A CN112735900A CN 112735900 A CN112735900 A CN 112735900A CN 202011363367 A CN202011363367 A CN 202011363367A CN 112735900 A CN112735900 A CN 112735900A
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- main contact
- vacuum interrupter
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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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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 using the same, wherein the vacuum arc-extinguishing chamber comprises: a housing; an upper contact bar; a return spring; 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; a lower contact bar; 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; the lower arc contact and the upper arc contact are in butt contact, the lower main contact and the upper main contact are in plug contact, and one of the upper main contact and the lower main contact is provided with an insertion hole for inserting the other one. Has the advantages that: the plug contact depends on the contact conduction between the inner hole and the outer wall, and joint pressure is not required to be applied in the up-down direction.
Description
Technical Field
The invention relates to the technical field of electric vacuum switches, in particular to a vacuum arc-extinguishing chamber and a vacuum circuit breaker using the same.
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 and the lower main contact are separated, the upper arc contact and the lower arc contact are still in a conducting state, and the upper conducting rod and the upper arc contact stop moving downwards until the limiting pad is in contact limiting with the upper end of the vacuum arc-extinguishing chamber. At the moment, the lower conducting rod continues to move downwards under the driving of the operating mechanism until the opening is limited, and the opening action of the circuit breaker is completed.
In the process of switching on and switching off, the electric arc burns only on the upper arc contact and the lower arc contact, and the upper arc contact and the lower arc contact are made of fusion welding resistant contact materials, so that the burning loss of the contact surface is light, and the breaking performance of the circuit breaker is improved.
However, since the upper arcing contact and the lower arcing contact, and the upper main contact and the lower main contact are in planar butt contact, in order to ensure the engagement pressure, a main contact spring needs to be arranged outside the movable end of the arc extinguish chamber, and the main contact spring is compressed by the operating mechanism to provide reliably closed contact pressure, but the structure outside the arc extinguish chamber is complicated, and the operation power of the operating mechanism is increased.
Disclosure of Invention
The invention aims to provide a vacuum arc-extinguishing chamber, which aims to solve the problems that the structure of the outer side of the arc-extinguishing chamber is more complex and the operation function is larger because an upper main contact and a lower main contact, an upper arc contact and a lower arc contact in the existing vacuum arc-extinguishing chamber are in butt contact and a main contact spring needs to be arranged on the outer side of a movable end of the arc-extinguishing chamber; the invention aims to provide a vacuum circuit breaker, which aims to solve the problems that an upper main contact and a lower main contact, an upper arc contact and a lower arc contact in the existing vacuum arc extinguish chamber are in butt contact, and a main contact spring needs to be arranged on the outer side of a movable end of the arc extinguish chamber, so that the outer side structure of the arc extinguish chamber is relatively complex, and the operation function is relatively large.
In order to achieve the purpose, the vacuum arc extinguish chamber adopts the following technical scheme:
a vacuum interrupter, comprising:
a housing;
the upper contact rod extends into the shell and can move up and down relative to the shell;
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 upper end of the lower contact rod extends into the shell, the lower end of the lower contact rod is used for being in transmission connection with the operating mechanism, and the lower contact rod can move up and down relative to the shell;
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;
when the lower contact rod moves downwards, the lower arc contact and the upper arc contact are separated from the lower main contact and the upper main contact behind the lower arc contact and the upper arc contact, and the lower arc contact and the upper arc contact are in butt contact;
the lower main contact and the upper main contact are in plug contact, and one of the upper main contact and the lower main contact is provided with a jack for inserting the other one.
The beneficial effects of the above technical scheme are that: the lower arc contact and the upper arc contact are in butt contact, so that after the lower arc contact is contacted with the upper arc contact, the lower arc contact can push the upper arc contact to continuously move upwards, the reset spring is deformed under the stress, and reset power is provided for the downward movement of the upper contact rod. The lower main contact and the upper main contact are in plug contact, one of the upper main contact and the lower main contact is provided with an insertion hole for the other to insert, the plug contact depends on the contact between an inner hole and an outer wall for conducting electricity, and joint pressure is not required to be applied in the upper and lower directions.
Further, for convenience of layout and manufacturing installation, the upper arcing contact is arranged on the inner side of the upper main contact, and the lower arcing contact is arranged on the inner side of the lower main contact.
Furthermore, in order to conveniently arrange 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 contact with the outer wall of the conductive tube for conducting electricity, and the upper contact rod penetrates through the conductive tube up and down.
Furthermore, in order to enable the upper contact rod and the upper main contact to move in a linked reverse direction, so that the upward moving stroke of the upper contact rod and the upward moving stroke of the lower contact rod are reduced during switching on, the upper main contact and the lower main contact are rapidly switched on, the distance between the upper main contact and the upper arc contact is rapidly increased during switching off, the time of electric arc diffusion to the upper main contact is prolonged, the ablation of the main contact is reduced, the upper main contact is in sliding contact and conductive fit with the outer wall of the conductive tube along the vertical direction, the vacuum arc extinguish chamber further comprises a linkage mechanism which is connected with the upper contact rod and the upper main contact so that the upper contact rod and the upper main contact move simultaneously in opposite directions, the linkage mechanism comprises a cylinder body arranged above the shell, the cylinder body 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, the top end of the upper contact rod extends into the, The other end of the linkage rod penetrates through the upper cover plate and the bottom wall of the cylinder body and extends into the cylinder body, a lever is rotatably mounted in the cylinder body, one end of the lever is in transmission connection with the upper contact rod, and the other end of the lever is in transmission connection with the linkage 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 contact rod extends into the shell and can move up and down relative to the shell;
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 upper end of the lower contact rod extends into the shell, the lower end of the lower contact rod is in transmission connection with the operating mechanism, and the lower contact rod can move up and down relative to the shell;
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;
when the lower contact rod moves downwards, the lower arc contact and the upper arc contact are separated from the lower main contact and the upper main contact behind the lower arc contact and the upper arc contact, and the lower arc contact and the upper arc contact are in butt contact;
the lower main contact and the upper main contact are in plug contact, and one of the upper main contact and the lower main contact is provided with a jack for inserting the other one.
The beneficial effects of the above technical scheme are that: the lower arc contact and the upper arc contact are in butt contact, so that after the lower arc contact is contacted with the upper arc contact, the lower arc contact can push the upper arc contact to continuously move upwards, the reset spring is deformed under the stress, and reset power is provided for the downward movement of the upper contact rod. The lower main contact and the upper main contact are in plug contact, one of the upper main contact and the lower main contact is provided with an insertion hole for the other to insert, the plug contact depends on the contact between an inner hole and an outer wall for conducting electricity, and joint pressure is not required to be applied in the upper and lower directions.
Further, for convenience of layout and manufacturing installation, the upper arcing contact is arranged on the inner side of the upper main contact, and the lower arcing contact is arranged on the inner side of the lower main contact.
Furthermore, in order to conveniently arrange 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 contact with the outer wall of the conductive tube for conducting electricity, and the upper contact rod penetrates through the conductive tube up and down.
Furthermore, in order to enable the upper contact rod and the upper main contact to move in a linked reverse direction, so that the upward moving stroke of the upper contact rod and the upward moving stroke of the lower contact rod are reduced during switching on, the upper main contact and the lower main contact are rapidly switched on, the distance between the upper main contact and the upper arc contact is rapidly increased during switching off, the time of electric arc diffusion to the upper main contact is prolonged, the ablation of the main contact is reduced, the upper main contact is in sliding contact and conductive fit with the outer wall of the conductive tube along the vertical direction, the vacuum arc extinguish chamber further comprises a linkage mechanism which is connected with the upper contact rod and the upper main contact so that the upper contact rod and the upper main contact move simultaneously in opposite directions, the linkage mechanism comprises a cylinder body arranged above the shell, the cylinder body 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, the top end of the upper contact rod extends into the, The other end of the linkage rod penetrates through the upper cover plate and the bottom wall of the cylinder body and extends into the cylinder body, a lever is rotatably mounted in the cylinder body, one end of the lever is in transmission connection with the upper contact rod, and the other end of the lever is in transmission connection with the linkage 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 fixed on the conductive pipe 2 while the lower end is fixed on 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, an upper arc contact 4 is positioned on the inner side of the upper main contact 3, 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.
The vacuum arc extinguish chamber further comprises a linkage mechanism which is connected with the upper contact rod 13 and the upper main contact 3 so that the upper contact rod 13 and the upper main contact 3 can move towards opposite directions simultaneously, the linkage mechanism comprises a linkage rod 14, a cylinder 17 and a lever structure 16, wherein the cylinder 17 is arranged above the shell 9, the cylinder 17 is provided with a cylinder bottom wall and a cylinder side wall, the cylinder bottom wall is fixedly connected with the top end of the conductive tube 2, the cylinder 17 is made of a conductive material, and the top end of the cylinder 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 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 fixed 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 plug-in conductive fit, and the conductive block 19 is conductively connected with the conductive tube 2 through the bottom wall of the cylinder. Therefore, the upper arcing contact 4 is indirectly connected with the upper main contact 3 through the upper contact rod 13, the conductive block 19, the bottom wall of the cylinder body 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 can be provided with return power.
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 reversing 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 bent to adapt to the smooth rotation of the lever 162, so as to 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 lower arcing contact 5 and the lower main contact 10 are fixed to the upper end of the lower contact rod 6, and a shield 11 is fixed to the inner wall of the housing 9, the shield 11 corresponding to the 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 cylindrical configuration, with its lower end fixed to the outer wall of the lower contact rod 6 and the lower arcing contact 5 located inside 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.
In the switching-on and switching-off process, as the lower arc contact and the upper arc contact are in butt contact, after the lower arc contact is contacted with the upper arc contact, the lower arc contact can push the upper arc contact to continue to move upwards, so that the reset spring is stressed and deformed, and reset power is provided for the downward movement of the upper contact rod. And the lower main contact and the upper main contact are in plug contact, the plug contact depends on the contact conduction between the inner hole and the 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 outside the movable end of the arc extinguish chamber can be omitted, the structure outside 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.
In addition, due to the fact that the linkage mechanism is arranged, the upper arc contact and the upper main contact can move towards opposite directions simultaneously, linkage of the upper arc contact and the upper main contact is achieved, in the switching-on process, the upward moving stroke of the upper contact rod and the upward moving stroke of the lower contact rod can be reduced, and the upper main contact and the lower main contact can be switched on rapidly. In the process of opening the brake, the upper main contact can be quickly separated from the upper arc contact, the time of the arc spreading to the upper main contact is prolonged, the ablation of the main contact is reduced, and the main contact is protected.
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 stud may not be provided 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 provided in the housing, and may be connected between the contact tube and the upper arcing contact, for example.
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 upper main contact may be fixed to the outer wall of the contact tube, without a linkage.
In other embodiments of the vacuum interrupter, the upper main contact may be directly fixed to the upper cover plate without a conductive tube, and the upper contact rod penetrates the upper main contact up and down, or the upper main contact may be directly fixed to the upper end of the housing as an upper cover plate structure as in the prior art.
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 arcing contact may also be arranged outside the upper main contact, while the lower arcing contact is arranged outside the lower main contact.
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 contact rod extends into the shell and can move up and down relative to the shell;
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 upper end of the lower contact rod extends into the shell, the lower end of the lower contact rod is used for being in transmission connection with the operating mechanism, and the lower contact rod can move up and down relative to the shell;
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;
when the lower contact rod moves downwards, the lower arc contact and the upper arc contact are separated from the lower main contact and the upper main contact behind the lower arc contact and the upper arc contact, and the lower arc contact and the upper arc contact are in butt contact;
the method is characterized in that: the lower main contact and the upper main contact are in plug contact, and one of the upper main contact and the lower main contact is provided with a jack for inserting the other one.
2. Vacuum interrupter according to claim 1, characterized in that: the upper arcing contact is arranged on the inner side of the upper main contact, and the lower arcing contact is arranged on the inner side of the lower main 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 contact conduction 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: go up main contact along the outer wall sliding contact conductive fit of upper and lower direction and contact tube, vacuum interrupter still includes and is connected so that go up contact rod and the link gear of last main contact towards opposite direction simultaneous movement with last contact rod and last main contact, the link gear is including setting up the barrel in the casing top, the barrel has barrel diapire and barrel lateral wall, barrel diapire and contact tube top fixed connection, it stretches into inside the barrel to go up contact rod top, the link gear still includes that one end is connected with last main contact, the other end passes upper cover plate and barrel diapire and stretches into the inside gangbar of barrel, the lever is installed to the barrel internal rotation, the one end and the last contact rod transmission of lever are connected, the other end is connected with the gangbar transmission.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011363367.1A CN112735900B (en) | 2020-11-27 | 2020-11-27 | Vacuum arc-extinguishing chamber and vacuum circuit breaker using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011363367.1A CN112735900B (en) | 2020-11-27 | 2020-11-27 | Vacuum arc-extinguishing chamber and vacuum circuit breaker using same |
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| CN112735900A true CN112735900A (en) | 2021-04-30 |
| CN112735900B CN112735900B (en) | 2023-02-17 |
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| CN209418419U (en) * | 2019-02-19 | 2019-09-20 | 宁波天安智能电网科技股份有限公司 | The vacuum interrupter combination being isolated built in a kind of and vacuum circuit breaker |
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| CH406358A (en) * | 1962-04-03 | 1966-01-31 | Gen Electric | Electric circuit breaker |
| GB1172190A (en) * | 1967-08-15 | 1969-11-26 | Gen Electric | Improvements in or relating to a Vacuum-Type Circuit Interrupter |
| SU775774A1 (en) * | 1978-12-22 | 1980-10-21 | Предприятие П/Я Р-6517 | Vacuum arc-extinguishing chamber contact device |
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| Publication number | Publication date |
|---|---|
| CN112735900B (en) | 2023-02-17 |
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