CN114783816A - Circuit breaker - Google Patents
Circuit breaker Download PDFInfo
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- CN114783816A CN114783816A CN202111593312.4A CN202111593312A CN114783816A CN 114783816 A CN114783816 A CN 114783816A CN 202111593312 A CN202111593312 A CN 202111593312A CN 114783816 A CN114783816 A CN 114783816A
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- resistor
- closing
- contact
- circuit breaker
- switching
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- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
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- 238000002679 ablation Methods 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
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Classifications
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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
- H01H33/02—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
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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
- H01H33/02—Details
- H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
- H01H33/08—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
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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
- H01H33/02—Details
- H01H33/42—Driving mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
Abstract
The invention relates to a circuit breaker, which comprises an arc extinguish chamber cylinder body fixedly provided with an arc extinguish chamber and an operating mechanism arranged on one side of the arc extinguish chamber cylinder body, wherein a supporting structure supported on a movable support is arranged in the arc extinguish chamber cylinder body; the circuit breaker comprises a closing resistor accommodating chamber which is used for covering the outside of the closing resistor; the circuit breaker further comprises a switching-on resistor fixed contact and a switching-on resistor moving contact, the switching-on resistor fixed contact comprises a fixed contact split body which is split on the two electric conductors, the switching-on resistor moving contact is used for extending into and being clamped between the two fixed contact split bodies to enable the switching-on resistor to be in short circuit, and is also used for being separated from the two fixed contact split bodies to enable the switching-on resistor to be connected into a main loop.
Description
Technical Field
The invention relates to the technical field of circuit breaker equipment, in particular to a circuit breaker.
Background
High-voltage switchgear and GIS products gradually develop towards compaction, especially, power grid users put forward standard interval distance requirements, and on the premise of ensuring product operation and maintenance convenience, the miniaturization of the high-voltage switchgear is achieved. At present, in order to prevent overvoltage of switching-on operation, a switching-on resistor is generally installed on a high-voltage-class circuit breaker to reduce the damage of overvoltage, so that the safe operation of a power system is ensured. In the prior art, closing resistor adopts in the mode of establishing ties or parallelly connected inserts the main circuit, for example the utility model patent of the publication number of authorizing is CN2896495Y provides a two-break jar formula circuit breaker explosion chamber, this explosion chamber includes the explosion chamber barrel (be the explosion chamber jar body in this patent), operating mechanism has been arranged to the downside of explosion chamber barrel, operating mechanism includes the insulating pull rod along the reciprocal action of upper and lower direction, the inboard of explosion chamber barrel is equipped with the support that moves (being the insulating support section of thick bamboo in this patent) that is used for supporting the explosion chamber, be fixed with electrically conductive bearing structure (being the braced frame in this patent) on the support that moves, bearing structure plays the effect of supporting the explosion chamber on the one hand, on the other hand also plays through-flow effect, the outside of explosion chamber (being the arc extinguishing unit in this patent) is fixed with closing resistor.
The problem of the circuit breaker is that the closing resistors are arranged at the left end and the right end of the arc extinguish chamber, so that the axial size of the arc extinguish chamber cylinder needs to be correspondingly increased. In addition, a transmission structure for realizing that the closing resistor is connected into the main circuit or short-circuited from the main circuit needs to be arranged between the closing resistor and the insulating pull rod, so that the radial size of the arc extinguish chamber cylinder body needs to be further increased, the whole size of the arc extinguish chamber cylinder body is increased, and the development trend of miniaturization of high-voltage switch equipment is deviated.
Disclosure of Invention
The invention aims to provide a circuit breaker, which aims to solve the technical problem that the overall size of an arc extinguish chamber cylinder is larger when a closing resistor is applied to the circuit breaker in the prior art.
The circuit breaker adopts the following technical scheme:
the circuit breaker comprises an arc extinguish chamber cylinder body fixedly provided with an arc extinguish chamber and an operating mechanism arranged on one side of the arc extinguish chamber cylinder body, wherein the operating mechanism comprises a movable support and an insulating pull rod which penetrates through the movable support and moves in a reciprocating manner, the moving direction of the insulating pull rod is perpendicular to the extending direction of the arc extinguish chamber cylinder body, the extending direction of the arc extinguish chamber cylinder body is taken as the left-right direction, the moving direction of the insulating pull rod is taken as the up-down direction, the arc extinguish chamber is driven to be switched on when the insulating pull rod moves upwards, and a supporting structure which is supported on the movable support and is positioned in a main loop is arranged in the arc extinguish chamber cylinder body; the circuit breaker comprises a closing resistor accommodating chamber used for covering the outside of the closing resistor, and the closing resistor accommodating chamber and the operating mechanism are respectively arranged at the upper side and the lower side of the arc extinguish chamber cylinder; the circuit breaker also comprises a closing resistor static contact and a closing resistor moving contact, wherein the closing resistor static contact comprises a static contact split body which is split on the two electric conductors, and the closing resistor moving contact is used for extending into and being clamped between the two static contact split bodies so as to short-circuit the closing resistor and is also used for being separated from the two static contact split bodies so as to connect the closing resistor into a main loop; the circuit breaker also comprises a transmission component connected with the insulating pull rod, the arc extinguish chamber and the switching-on resistance moving contact, wherein the transmission component is used for switching on the arc extinguish chamber before switching on when switching on, driving the switching-on resistance moving contact to move upwards and be in contact with the switching-on resistance fixed contact to be switched on after switching on, and is also used for switching off the arc extinguish chamber before switching on and driving the switching-on resistance moving contact to move downwards and be separated from the switching-on resistance fixed contact after switching off; the transmission component comprises a reversing transmission member arranged between the insulating pull rod and the arc extinguish chamber and a driving member used for driving the switching-on resistance moving contact to move up and down, the driving member comprises a lower pulling portion and an upper pushing portion which are sequentially arranged along the upper direction and the lower direction at intervals, the lower pulling portion is used for pulling the switching-on resistance moving contact downwards, the upper pushing portion is used for pushing the switching-on resistance moving contact upwards, and the switching-on resistance moving contact is assembled in the driving member in a sliding mode along the upper direction and the lower direction and located between the lower pulling portion and the upper pushing portion.
Has the beneficial effects that: in the circuit breaker provided by the invention, the closing resistor is connected in series in the main loop and arranged at the position corresponding to the upper part and the lower part of the insulating pull rod, so that the radial size of the arc extinguish chamber cylinder is not required to be additionally increased after the closing resistor is increased, and only one side of the arc extinguish chamber cylinder is required to be additionally provided with the closing resistor accommodating chamber. The radial and axial sizes of the arc extinguish chamber cylinder body cannot be increased, and the circuit breaker is compact. In order to meet the requirements that the closing resistor is connected into the main loop firstly when the switch is closed and is short-circuited after the main loop is connected, and the closing resistor is connected into the main loop after the main loop is disconnected when the switch is opened so as to carry out the next closing operation; the driving part has idle stroke when the moving contact of the closing resistor is pulled down, and the requirement that the closing resistor is connected into the main loop after the main loop is disconnected during opening is met. The switching-on resistance moving contact can be clamped between two fixed contact split bodies of the switching-on resistance fixed contact, so that after the push-up part of the driving part is separated from the switching-on resistance moving contact, the switching-on resistance fixed contact and the switching-on resistance moving contact are still relatively fixed, and only after the pull-down part is contacted with the switching-on resistance moving contact, the switching-on resistance moving contact can be pulled downwards to realize separation from the switching-on resistance fixed contact, so that the purpose of hysteresis movement of the switching-on resistance moving contact is realized in the process.
Furthermore, the fixed contact is separated into reeds, and the two reeds are used for being matched with and clamping the moving contact of the closing resistor.
Has the beneficial effects that: the reed has better elasticity and conductivity, and after the moving contact of the closing resistor enters between the two reeds, the two reeds can well clamp the moving contact of the closing resistor, so that the normal through-flow of the main loop is prevented from being influenced by the fact that the closing resistor is reconnected into the main loop.
Furthermore, the driving member includes a rod body extending up and down, the moving contact of the closing resistor is slidably sleeved on the rod body, the push-up portion is an annular step arranged on the rod body, and the pull-down portion is an impact head arranged at the upper end of the rod body.
Has the beneficial effects that: the moving contact of the closing resistor is slidably sleeved on the rod body and is provided with the annular step and the impact head, the structure is favorable for realizing the pushing-up and pulling-down of the moving contact of the closing resistor, and the anti-drop assembly between the moving contact of the closing resistor and the rod body can be ensured.
Furthermore, two guide cylinders extending in the vertical direction are arranged on the movable support, guide rods are assembled in the guide cylinders in a guiding movement mode, and the guide rods are connected with the movable contact of the closing resistor.
Has the beneficial effects that: through the guide cylinder and the guide rod, the position of the moving contact of the closing resistor and the up-and-down moving track can be accurately guided, so that the moving contact of the closing resistor can reliably enter between two fixed contact split bodies of the fixed contact of the closing resistor.
Further, a return spring is arranged between the guide cylinder and the guide rod to provide downward elastic force for the moving contact of the closing resistor
Has the beneficial effects that: the reset spring provides downward elastic force for the moving contact of the closing resistor, so that the moving contact of the closing resistor is more easily separated from the split parts of the two fixed contacts when the switch is switched off; after slipping out, the reset spring can enable the moving contact of the closing resistor to quickly and accurately return to the original position.
Furthermore, the reversing transmission part comprises a crank arm hinged on the electric conductor, one end of the crank arm is connected with the arc extinguish chamber, and the other end of the crank arm is directly or indirectly connected with the insulating pull rod through a connecting rod.
Has the beneficial effects that: the crank arm and the pull rod matched transmission structure has the characteristics of stable transmission and small occupied space, and the crank arm is directly or indirectly connected with the insulating pull rod through the connecting rod, so that the clamping stagnation is prevented.
Furthermore, the closing resistor comprises resistor split bodies separately arranged on the two conductors, the resistor split bodies of the two conductors are in conductive communication through a conductive plate, and the static contact of the closing resistor is located below the conductive plate.
Has the beneficial effects that: the resistance components of the two conductors are in conductive communication through the conductive plates, so that the resistance value of the closing resistor can be improved, the heat which can be converted during closing is higher, and the effect of protecting the main loop contact is more obvious.
Further, the resistance dividing bodies extend in the up-down direction.
Has the advantages that: the resistance components of a whole that can function independently extend along the upper and lower direction can reduce the occupation space of the closing resistance in the left and right direction, and the overall size of the arc extinguish chamber cylinder in the radial direction and the axial direction can be reduced on the whole.
Further, an insulating plate is arranged between the conductive plate and the static contact of the closing resistor.
Has the advantages that: the insulating plate can prevent the two fixed contact components from being communicated through the conducting plate, so that the closing resistor is short-circuited when the moving contact of the closing resistor and the fixed contact of the closing resistor are not communicated.
Furthermore, the movable support is a metal support, an insulating pad is arranged on the metal support, and the electric conductor is supported on the insulating pad.
Has the beneficial effects that: the movable support adopts a metal structure, so that the supporting performance of the movable support is better, the insulating pad can prevent the two electric conductors from being conducted through the movable support, and the mutual insulation between the two electric conductors is kept.
Drawings
Figure 1 is a schematic diagram of a circuit breaker provided by the present invention;
FIG. 2 is a schematic view of the internal structure of the arc chute barrel of FIG. 1 (only one side structure is shown);
FIG. 3 is a schematic structural diagram of a closing resistor, a left conductor, and a right conductor;
FIG. 4 is a schematic diagram of the transmission between the driving member and the left and right arc-extinguishing chambers;
FIG. 5 is a schematic transmission diagram of a driving member and a closing resistance moving contact;
fig. 6 is a schematic diagram of the matching of the moving contact of the closing resistor and the fixed contact of the closing resistor.
Names of components corresponding to corresponding reference numerals in the drawings are:
100. an arc extinguish chamber cylinder; 101. a closing resistor accommodating chamber; 200. a movable support; 201. an insulating pad; 202. a left conductor; 203. a left spring leaf; 204. a right electrical conductor; 205. a right reed; 206. a right arc extinguish chamber; 207. a guide cylinder; 208. a guide bar; 209. a switch-on resistance moving contact; 210. a return spring; 300. an operating mechanism; 301. an insulating pull rod; 302. a drive member; 303. an annular step; 304. a striking head; 305. a left crank arm; 306. a first link; 307. a movable end conductive rod; 400. a closing resistor; 401. a first resistor split body; 402. the second resistor is split; 403. a third resistor is split; 404. a fourth resistor split body; 405. a conductive plate; 406. an insulating plate; 407. and a conductive block.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in 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 to be noted that, in the embodiments of the present invention, relational terms such as "first" and "second", and the like, which may be present in the terms of the first and second, 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, terms such as "comprises," "comprising," or any other variation thereof, which may be present, 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, the statement that "comprises a" … …, "or the like, may occur does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be connected internally or indirectly to each other. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
In the description of the invention, unless otherwise explicitly specified or limited, the term "provided" should be understood broadly, for example, the object provided may be a part of the body, or may be arranged separately from the body and connected to the body, which may or may not be detachable. The specific meanings of the above-mentioned terms in the present invention can be understood by those skilled in the art through specific situations.
The present invention will be described in further detail with reference to examples.
Embodiment 1 of the circuit breaker of the present invention:
as shown in fig. 1 and fig. 2, the circuit breaker provided in this embodiment is a dual-break circuit breaker, and the circuit breaker includes an arc extinguish chamber cylinder 100 and an operating mechanism 300, where the operating mechanism 300 includes a movable support 200 and an insulating pull rod 301 that are arranged in the arc extinguish chamber cylinder 100, two arc extinguish chambers are further installed in the arc extinguish chamber cylinder 100, the two arc extinguish chambers are supported and installed on the movable support 200 through a support structure, a closing resistor 400 is connected between the two arc extinguish chambers, a closing resistor fixed contact and a closing resistor moving contact 209 are further arranged in the arc extinguish chamber cylinder 100, and the insulating pull rod 301 is respectively connected to the arc extinguish chamber and the closing resistor moving contact 209 through a transmission component, so as to respectively drive the switching-on and switching-off of the arc extinguish chambers and the contact and separation of the closing resistor moving contact and the closing resistor moving contact. For convenience, the extending direction of the arc extinguish chamber cylinder 100 is defined as a left-right direction, and the moving direction of the insulating pull rod 301 is defined as an up-down direction.
Specifically, as shown in fig. 1 and 2, the actuator 300 is disposed at a lower side of the arc extinguishing chamber cylinder 100 and near a middle position of the arc extinguishing chamber cylinder 100, and the actuator 300 includes an insulating rod 301 and a movable support 200 which reciprocate in an up-down direction. The movable support 200 is positioned at the position of a pulling opening of the arc extinguish chamber cylinder 100, the movable support 200 is made of metal materials, a support structure is installed on the upper side of the movable support 200, the support structure comprises two electric conductors which are a left electric conductor 202 and a right electric conductor 204 and are positioned in a main loop, the left electric conductor 202 and the right electric conductor 204 are arranged on the movable support 200 at intervals along the left-right direction, the left electric conductor 202 and the right electric conductor 204 are mutually insulated, an insulating pad 201 is fixed at the upper end of the movable support 200 for preventing the left electric conductor 202 and the right electric conductor 204 from being conducted, the left electric conductor 202 and the right electric conductor 204 are supported on the insulating pad 201 for preventing mutual communication, the top parts of the left electric conductor 202 and the right electric conductor 204 are connected through a closing resistor 400, the closing resistor 400 is positioned above the left electric conductor 202 and the right electric conductor 204 and protrudes out of the arc extinguish chamber cylinder 100 for accommodating the closing resistor 400, a closing resistor accommodating chamber 101 is arranged on the upper side of the arc extinguish chamber cylinder 100, the closing resistor 400 is accommodated in the closing resistor accommodating chamber 101. The closing resistor accommodating chamber 101 is a closing resistor accommodating cylinder, and the closing resistor accommodating chamber 101 and the operating mechanism 300 are separately arranged on the upper side and the lower side of the arc extinguish chamber cylinder 100 and are arranged opposite to each other.
In this embodiment, the two arc extinguishing chambers include a left arc extinguishing chamber (not shown in the figure) and a right arc extinguishing chamber 206, the left arc extinguishing chamber includes a left active contact and a left main static contact for controlling the on/off of the main circuit, the left arc extinguishing chamber is supported and installed on the left side of the left conductor 202, as shown in fig. 2, the right arc extinguishing chamber 206 includes a right active contact and a right main static contact for controlling the on/off of the main circuit, and the right arc extinguishing chamber 206 is supported and installed on the right side of the right conductor 204. As shown in fig. 3, the closing resistor 400 includes a first resistor division 401, a second resistor division 402, a third resistor division 403, and a fourth resistor division 404, the first, second, third, and fourth resistor divisions all extend in the vertical direction, the first and second resistor divisions are disposed on the left conductor 202, the third and fourth resistor divisions are disposed on the right conductor 204, the upper ends of the first and second resistor divisions are connected by a conductive block 407, the upper ends of the third and fourth resistor divisions are also connected by a conductive block 407, and the lower ends of the second and third resistor divisions are connected by a conductive plate 405. When the closing resistor 400 is connected to the main circuit, the current in the main circuit flows through the left arc-extinguishing chamber to the left conductor 202, then flows through the first, second, third and fourth resistors to the right conductor 204, and finally flows through the right arc-extinguishing chamber 206 to the outside of the arc-extinguishing chamber cylinder 100. When the closing resistor 400 is short-circuited in the main circuit, the current in the main circuit flows through the left arc extinguish chamber to the left conductor 202, flows through the moving contact 209 and the static contact of the closing resistor to the right conductor 204, and finally flows through the right arc extinguish chamber 206 to the outside of the arc extinguish chamber cylinder 100.
As shown in fig. 3, 5, and 6, the closing resistor static contact is located below the conductive plate 405, and includes static contact split bodies separately disposed on the left conductive body 202 and the right conductive body 204, where the two static contact split bodies are a left reed 203 and a right reed 205, respectively, the left reed 203 is disposed on one side of the left conductive body 202 facing the right conductive body 204, and the right reed 205 is disposed on one side of the right conductive body 204 facing the left conductive body 202, so that the left reed 203 and the right reed 205 are disposed at intervals in the left-right direction. The size of the closing resistance moving contact 209 is matched with the interval between the left reed 203 and the right reed 205 in a matched mode, when the closing resistance moving contact 209 stretches into the space between the left reed 203 and the right reed 205, the closing resistance moving contact 209 can be clamped by the left reed 203 and the right reed 205, when the closing resistance moving contact 209 extends to the space between the left reed 203 and the right reed 205 and is clamped, the closing resistance moving contact 209 and the closing resistance static contact are conducted, the closing resistance 400 is in short circuit, when the closing resistance moving contact 209 is located below the left reed 203 and the right reed 205, the closing resistance moving contact 209 and the closing resistance static contact are separated and disconnected, and the closing resistance 400 is connected into a main loop.
As shown in fig. 3, in order to prevent the conductive plate 405 from being erroneously contacted with the left and right reeds 203 and 205 during use to short-circuit the closing resistor 400, an insulating plate 406 is fixed between the conductive plate 405 and the closing resistor stationary contact, the insulating plate 406 is fixed to the left and right conductors 202 and 204, and the second and third resistor division bodies 402 and 403 are supported by the insulating plate 406.
When the device is used and switched on, before the moving contact and the static contact of the main loop are switched on, the moving contact 209 and the static contact of the switching-on resistor are required to be separated, the switching-on resistor 400 is connected into the main loop, and after the main loop is switched on, the moving contact and the static contact of the switching-on resistor are switched on to short-circuit the switching-on resistor 400, so that normal through flow is ensured; during opening, the live opening of the moving contact 209 and the static contact of the closing resistor is avoided, when the moving contact and the static contact of the main loop are opened, the closing resistor 400 needs to be ensured to be still in a short-circuited state, and after the moving contact and the static contact of the main loop are opened, the moving contact 209 and the static contact of the closing resistor are separated to prepare for next closing. That is, during switching on, the moving contact and the static contact of the main circuit are switched on before the moving contact 209 and the static contact of the switching on resistor, and during switching off, the moving contact 209 and the static contact of the switching on resistor are switched off after the moving contact and the static contact of the main circuit.
The driving part comprises a reversing driving part and a driving part 302, as shown in fig. 4, the driving part 302 is hinged to the upper end of the insulating pull rod 301, the driving part 302 comprises a rod body extending along the up-down direction, an annular step 303 and an impact head 304 are arranged on the rod body, the annular step 303 and the impact head 304 are arranged at intervals from bottom to top, and the closing resistor moving contact 209 is of a block structure and is slidably sleeved on the rod body and located between the annular step 303 and the impact head 304. Of course, in actual processing, in order to ensure that the moving contact 209 of the closing resistor can be sleeved outside the rod body, the striking head 304 or the annular step 303 needs to be designed to be a detachable structure. As shown in fig. 3 and 4, in order to avoid the rod, avoiding holes are formed on the insulating plate 406 and the conductive plate 405 for the rod and the impact head 304 at the top of the rod to pass through. The annular step 303 is used to push the moving contact 209 of the closing resistor upward to serve as an upward pushing portion, and the striking head 304 is used to pull the moving contact 209 of the closing resistor downward to serve as a downward pulling portion. Moreover, since the length of the moving contact 209 of the closing resistor in the vertical direction is smaller than the distance between the impact head 304 and the annular step 303, the moving contact 209 of the closing resistor can slide up and down, even if the annular step 303 is separated from the moving contact 209 of the closing resistor, the moving contact 209 of the closing resistor can be kept clamped in the fixed contact of the closing resistor until the moving contact 209 of the closing resistor is pulled down by the impact head 304, that is, the driving member 302 has a section of idle stroke.
In order to guide the up-and-down movement of the closing resistor moving contact 209, as shown in fig. 5 and 6, a guide cylinder 207 extending in the up-and-down direction is disposed on an insulating pad 201 on a moving support 200, a guide rod 208 is disposed in the guide cylinder 207 in a guiding manner, the closing resistor moving contact 209 is connected to the upper end of the guide rod 208, so that the closing resistor moving contact 209 can move in the up-and-down direction in a guiding manner, in addition, a return spring 210 is disposed between the guide rod 208 and the guide cylinder 207 for enabling the closing resistor moving contact to be rapidly reset, and the return spring 210 provides a downward elastic force to the guide rod 208.
As shown in fig. 4, a reversing transmission member is disposed corresponding to each vacuum interrupter, the reversing transmission member includes a crank arm and two connecting rods, the driving member 302 is consistent with the linkage manner of the left driving contact and the right driving contact, which is described herein by taking the left driving contact as an example, the reversing transmission member corresponding to the left driving contact includes a left crank arm 305, the left crank arm 305 has three hinge points, the three hinge points are located at three vertexes of a triangle, one of the hinge points is hinged on the left conductive body 202, and one of the hinge points is hinged on the driving member 302, specifically, on the annular step 303 of the driving member 302 through the first connecting rod 306. The last hinge point of the left crank arm 305 is hinged to the movable end conducting rod 307 of the arc extinguish chamber through a second connecting rod (not shown in the figure). During the use, when insulating pull rod 301 upwards removes, first connecting rod 306 drives the connecting lever (including left connecting lever and right connecting lever) and swings, and the connecting lever swing drives the explosion chamber and carries out the closing operation, drives the explosion chamber when insulating pull rod 301 moves down and carries out the separating brake operation.
In actual design and processing, the requirement during closing is met by reasonably setting the shape of the crank arm, the height of the annular step 303 and the distance between the moving contact 209 of the closing resistor and the fixed contact of the closing resistor, and the requirement during opening is met by the downward idle stroke of the driving part 302.
The using process is as follows: during closing, the insulating pull rod 301 moves upwards under the driving of the operating mechanism 300, the right active contact moves rightwards under the driving of the driving piece 302, the left active contact moves leftwards, the closing resistance moving contact 209 moves upwards under the pushing of the annular step 303, after the right active contact and the left active contact are respectively contacted with the corresponding main fixed contacts, the left arc extinguish chamber and the right arc extinguish chamber complete closing, after the interval is 8-11ms, the closing resistance moving contact 209 extends between the left reed 203 and the right reed 205 under the pushing of the annular step 303, at the moment, the main loop flows through the closing resistance moving contact 209, and the closing resistance 400 is in short circuit. During opening, the insulating pull rod 301 moves downwards under the driving of the operating mechanism 300, the right driving contact moves leftwards under the driving of the driving element 302, the left driving contact moves rightwards, the left arc-extinguishing chamber and the right arc-extinguishing chamber complete opening, after an interval of 3-5ms, the impact head 304 contacts with the moving contact 209 of the closing resistor, the moving contact 209 of the closing resistor exits from between the left reed 203 and the right reed 205 under the pulling of the impact head 304, and at the moment, the closing resistor 400 is connected into the main loop again.
It should be specially noted that the circuit breaker provided in this embodiment may also be a single-break circuit breaker, on the basis of the above-mentioned double-break circuit breaker, a structure in which the left arc-extinguishing chamber and the insulating pull rod 301 are linked with the left arc-extinguishing chamber is cancelled in the single-break circuit breaker, only one right arc-extinguishing chamber 206 is arranged in the arc-extinguishing chamber cylinder 100, at this time, a portion for accommodating the left arc-extinguishing chamber may be omitted from the arc-extinguishing chamber cylinder 100, the right arc-extinguishing chamber 206 is supported on the movable support 200 through the right conductor 204, the current in the main circuit enters the arc-extinguishing chamber cylinder 100 and then is communicated with the left conductor 202, and the rest of the structures are the same as the above-mentioned double-break circuit breaker structure, and will not be described herein again.
It should be noted that, in the present embodiment, the directions are defined only for convenience of description, and the upper, lower, left, and right are only relative concepts, and may be turned by 90 ° for use in actual use, which does not limit the specific structure of the circuit breaker.
In practical use, when the circuit breaker is applied to a use scene with a low voltage level, the closing resistor 400 can be taken down, and although the moving contact 209 and the fixed contact of the closing resistor have the condition of live closing, the arc discharge ablation degree generated in the closing process is limited, so that the normal use can be still ensured.
Embodiment 2 of the circuit breaker in the present invention:
the difference between this embodiment and embodiment 1 is that in embodiment 1, the reversing transmission member includes a crank arm and a link. In the embodiment, the reversing transmission part comprises a pushing head, a sliding block and a reset elastic part, the pushing head is arranged on the driving part, the sliding block is arranged on a movable contact rod used for pushing the driving contact, the sliding block is provided with an inclined surface matched with the pushing head in a pushing way, and the reset elastic part is arranged between the movable contact rod and the corresponding conductor; when the insulating pull rod moves upwards, the pushing head on the driving piece pushes the corresponding sliding block, the sliding block drives the corresponding movable contact rod to act, the switching-on of the arc extinguish chamber is completed, and the reset elastic piece is in a compressed state; when the insulating pull rod moves downwards, the reset elastic piece provides elastic force for the corresponding movable contact rod, so that the movable contact rod drives the corresponding active contact to act, and the switching-off of the arc extinguish chamber is completed.
Embodiment 3 of the circuit breaker of the present invention:
the present embodiment is different from embodiment 1 in that in embodiment 1, the resistance dividing body extends in the vertical direction. In this embodiment, the extending direction of the resistor split body is consistent with the extending direction of the arc extinguish chamber cylinder body.
Embodiment 4 of the circuit breaker of the invention:
the present embodiment is different from embodiment 1 in that, in embodiment 1, the closing resistor includes four resistor divisions. In this embodiment, the closing resistor is an integral body, the integral body is in a U-shaped structure, and two ends of the closing resistor are respectively connected with the left and right conductors to connect the left and right conductors.
Embodiment 5 of the circuit breaker in the present invention:
the present embodiment is different from embodiment 1 in that, in embodiment 1, the closing resistor accommodating chamber is a cylindrical barrel. In this embodiment, the closing resistor accommodating chamber is a spherical shell.
Example 6 of the circuit breaker in the present invention:
the difference between the present embodiment and embodiment 1 is that in embodiment 1, the moving contact of the closing resistor is guided by the guide cylinder and the guide rod. In this embodiment, the movable support is not provided with a conductive tube and a conductive rod, the moving contact of the closing resistor is slidably sleeved on the rod body of the driving member, the rod body is designed to be a square rod in order to prevent the moving contact of the closing resistor from rotating, and correspondingly, a square hole corresponding to the square rod is formed in the moving contact of the closing resistor.
Embodiment 7 of the circuit breaker of the invention:
the difference between this embodiment and embodiment 1 is that, in embodiment 1, the driving member includes a rod body extending in the up-down direction, an annular step and an impact head are provided on the rod body, the annular step serves as an upward pushing portion, and the impact head serves as a downward pulling portion. In other embodiments, the driving member includes two vertical plates arranged in parallel, each vertical plate is provided with a sliding slot extending vertically, the closing resistor moving contact is located between the two vertical plates, and two sides of the closing resistor moving contact are provided with guide rods penetrating into the sliding slots on the vertical plate on the corresponding side. When the driving piece moves upwards, the bottom groove wall of the sliding groove pushes the guide rod and the moving contact of the closing resistor to move upwards; when the driving part moves downwards, the top groove wall of the sliding groove is not in contact with the guide rod in the initial stage, after the driving part moves downwards for a certain distance, the top groove wall of the sliding groove is in contact with the guide rod, the moving contact of the closing resistor is pushed downwards, and the moving contact of the closing resistor and the fixed contact of the closing resistor are separated. In this embodiment, a bottom groove wall of the chute forms an upward pushing portion for pushing the moving contact of the closing resistor to move toward the fixed contact of the closing resistor, and a top groove wall forms a downward pulling portion for pulling the moving contact of the closing resistor to separate from the fixed contact of the closing resistor.
Embodiment 8 of the circuit breaker in the present invention:
the present embodiment is different from embodiment 1 in that in embodiment 1, the crank arm is indirectly connected to the driving member via the first link. In this embodiment, the crank arm is directly hinged to the annular step of the driving member. In other embodiments, the crank arm may be directly hinged to the insulated pull rod.
Example 9 of the circuit breaker in the present invention:
the difference between this embodiment and embodiment 1 is that in embodiment 1, the fixed contact separation body is a reed. In this embodiment, the fixed contact split bodies are elastic pieces capable of conducting electricity, the elastic piece split bodies are arranged on the left and right electric conductors and form an open structure in the direction towards the closing resistance moving contact, when the closing resistance moving contact enters the space between the elastic pieces on the left and right electric conductors, the elastic pieces can clamp the closing resistance moving contact, and when the closing resistance moving contact is pulled down, the closing resistance moving contact can slide out from the space between the elastic pieces. In other embodiments, the static contact split body can also be two rigid conductive blocks, the two conductive blocks are separately arranged on the left and right conductive bodies, at this time, an elastic sheet is arranged on the closing resistance moving contact, when the closing resistance moving contact enters between the two conductive blocks, the elastic sheet is supported on the two conductive blocks, the closing resistance moving contact can be clamped between the two conductive blocks by utilizing the supporting force of the elastic sheet, and when opening, the closing resistance moving contact can slide out from between the two conductive blocks only by applying a lower pulling force greater than the supporting force to the closing resistance moving contact.
Embodiment 10 of the circuit breaker in the present invention:
the present embodiment is different from embodiment 1 in that, in embodiment 1, an insulating plate is disposed between a conductive plate and a closing resistor fixed contact. In this embodiment, when the distance between the conductive plate and the static contact of the closing resistor is long, the insulating plate may be eliminated.
Embodiment 11 of the circuit breaker of the invention:
the present embodiment is different from embodiment 1 in that in embodiment 1, the movable support is a metal support. In the embodiment, the movable support is made of insulating materials, and an insulating pad is not required to be arranged between the movable support and the left and right conductors.
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 circuit breaker comprises an arc extinguish chamber cylinder (100) fixedly provided with an arc extinguish chamber and an operating mechanism (300) arranged on one side of the arc extinguish chamber cylinder (100), wherein the operating mechanism (300) comprises a movable support (200) and an insulating pull rod (301) which penetrates through the movable support (200) and moves in a reciprocating manner, the moving direction of the insulating pull rod (301) is perpendicular to the extending direction of the arc extinguish chamber cylinder (100), the extending direction of the arc extinguish chamber cylinder (100) is taken as the left-right direction, the moving direction of the insulating pull rod (301) is taken as the up-down direction, the arc extinguish chamber is driven when the insulating pull rod (301) moves upwards, and a supporting structure which is supported on the movable support (200) and is positioned in a closing circuit is arranged in the arc extinguish chamber cylinder (100); the circuit breaker is characterized by comprising two conductors which are separately arranged along the left direction and the right direction, wherein the two conductors are insulated from each other, the upper ends of the two conductors are connected through a closing resistor (400), the closing resistor (400) protrudes upwards out of an arc extinguish chamber cylinder (100) to be arranged, the circuit breaker comprises a closing resistor accommodating chamber (101) which is used for covering the outside of the closing resistor (400), and the closing resistor accommodating chamber (101) and an operating mechanism (300) are separately arranged at the upper side and the lower side of the arc extinguish chamber cylinder (100); the circuit breaker further comprises a closing resistor static contact and a closing resistor moving contact (209), the closing resistor static contact comprises a static contact split body which is split on the two electric conductors, and the closing resistor moving contact (209) is used for extending into and being clamped between the two static contact split bodies to short-circuit the closing resistor (400) and is also used for being separated from the two static contact split bodies to connect the closing resistor (400) into a main circuit; the circuit breaker also comprises a transmission component connected with the insulating pull rod (301), the arc extinguish chamber and the moving contact (209) of the switching-on resistor, wherein the transmission component is used for switching on the arc extinguish chamber before switching on the switch, driving the moving contact (209) of the switching-on resistor to move upwards and be in contact conduction with the fixed contact of the switching-on resistor after switching on the switch, and is also used for switching off the arc extinguish chamber before switching on the switch and driving the moving contact (209) of the switching-on resistor to move downwards and be separated from the fixed contact of the switching-on resistor when switching off the switch; the transmission part comprises a reversing transmission part arranged between an insulating pull rod (301) and an arc extinguish chamber and a driving part (302) used for driving a closing resistance moving contact (209) to move up and down, the driving part (302) comprises a lower pulling part and an upper pushing part which are sequentially arranged along the upper direction and the lower direction at intervals, the lower pulling part is used for pulling the closing resistance moving contact (209) downwards, the upper pushing part is used for upwards pushing the closing resistance moving contact (209), and the closing resistance moving contact (209) is assembled on a part, located between the lower pulling part and the upper pushing part, of the driving part (302) in a sliding mode along the upper direction and the lower direction.
2. The circuit breaker of claim 1, wherein the stationary contact is a reed, and the two reeds are used for clamping the movable contact (209) of the closing resistor in a matching manner.
3. The circuit breaker according to claim 1, wherein the driving member (302) comprises a rod extending up and down, the closing resistor moving contact (209) is slidably mounted on the rod, the pushing portion is an annular step (303) formed on the rod, and the pulling portion is a striking head (304) formed on an upper end of the rod.
4. The circuit breaker according to claim 3, characterized in that two guide cylinders (207) extending in the up-and-down direction are arranged on the movable support (200), a guide rod (208) is assembled in the guide cylinders (207) in a guiding and moving manner, and the guide rod (208) is connected with the movable closing resistor contact (209).
5. The circuit breaker according to claim 4, wherein a return spring (210) is arranged between the guide cylinder (207) and the guide rod (208) to provide a downward elastic force to the closing resistance movable contact (209).
6. A circuit breaker according to any one of claims 1 to 5, wherein the reversing drive comprises a lever hingedly connected to the conductor, the lever being connected at one end to the arc chute and at the other end to the insulating pull rod, directly or indirectly, by a link.
7. The circuit breaker according to any one of claims 1 to 5, wherein the closing resistor (400) comprises a resistor split disposed on two electrical conductors, the resistor split of the two electrical conductors are in conductive communication with each other through a conductive plate (405), and the closing resistor stationary contact is located below the conductive plate (405).
8. The circuit breaker of claim 7, wherein the resistance sub-body extends in an up-down direction.
9. The circuit breaker according to claim 7, wherein an insulating plate (406) is disposed between the conductive plate (405) and the closing resistor stationary contact.
10. The circuit breaker according to any one of claims 1 to 5, wherein the movable support (200) is a metal support, an insulating pad (201) is provided on the metal support, and the conductive body is supported on the insulating pad (201).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111593312.4A CN114783816B (en) | 2021-12-23 | 2021-12-23 | Circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111593312.4A CN114783816B (en) | 2021-12-23 | 2021-12-23 | Circuit breaker |
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| Publication Number | Publication Date |
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| CN114783816A true CN114783816A (en) | 2022-07-22 |
| CN114783816B CN114783816B (en) | 2024-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111593312.4A Active CN114783816B (en) | 2021-12-23 | 2021-12-23 | Circuit breaker |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115692087A (en) * | 2022-10-26 | 2023-02-03 | 正泰电气股份有限公司 | Closing resistor transmission structure and circuit breaker |
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| CN2896495Y (en) * | 2006-03-20 | 2007-05-02 | 西安西开高压电气股份有限公司 | Arc-chutes of 800 kv double-fracture can-type circuit breaker |
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| CN105551900A (en) * | 2014-10-23 | 2016-05-04 | Ls产电株式会社 | Supporting structure of closing resistor for high voltage circuit breaker |
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| US5354959A (en) * | 1992-04-14 | 1994-10-11 | Mitsubishi Denki Kabushiki Kaisha | Circuit breaker |
| JPH065162A (en) * | 1992-06-18 | 1994-01-14 | Toshiba Corp | Breaker with resistor |
| JPH065164A (en) * | 1992-06-18 | 1994-01-14 | Toshiba Corp | Breaker with resistor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115692087A (en) * | 2022-10-26 | 2023-02-03 | 正泰电气股份有限公司 | Closing resistor transmission structure and circuit breaker |
| CN115692087B (en) * | 2022-10-26 | 2023-10-17 | 正泰电气股份有限公司 | Switching-on resistor transmission structure and circuit breaker |
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|---|---|
| CN114783816B (en) | 2024-02-23 |
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