CN114783816B - Circuit breaker - Google Patents
Circuit breaker Download PDFInfo
- Publication number
- CN114783816B CN114783816B CN202111593312.4A CN202111593312A CN114783816B CN 114783816 B CN114783816 B CN 114783816B CN 202111593312 A CN202111593312 A CN 202111593312A CN 114783816 B CN114783816 B CN 114783816B
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- Prior art keywords
- resistor
- arc
- closing
- closing resistor
- extinguishing chamber
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- 239000004020 conductor Substances 0.000 claims abstract description 56
- 230000003068 static effect Effects 0.000 claims abstract description 20
- 230000005540 biological transmission Effects 0.000 claims description 21
- 239000002184 metal Substances 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000004880 explosion Methods 0.000 abstract description 4
- 230000004308 accommodation Effects 0.000 abstract 1
- 235000014676 Phragmites communis Nutrition 0.000 description 30
- 230000009286 beneficial effect Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 244000273256 Phragmites communis Species 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
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
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
- Circuit Breakers (AREA)
Abstract
The utility model relates to a circuit breaker, which comprises an arc-extinguishing chamber cylinder fixedly provided with an arc-extinguishing chamber and an operating mechanism arranged on one side of the arc-extinguishing chamber cylinder, wherein a supporting structure supported on a movable support is arranged in the arc-extinguishing chamber cylinder; the support structure comprises two conductors, the upper ends of the two conductors are connected through a closing resistor, and the circuit breaker comprises a closing resistor accommodating chamber which is used for being covered outside the closing resistor; the circuit breaker still includes closing resistor static contact and closing resistor moving contact, and closing resistor static contact is including the static contact components of a whole that can function independently on two electric conductors, and closing resistor moving contact is used for stretching into and is pressed from both sides tightly between two static contact components of a whole that can function independently in order to short circuit closing resistor, still is arranged in separating with two static contact components of a whole that can function independently in order to connect closing resistor into the main loop, and explosion chamber barrel in this embodiment only need set up the closing resistor accommodation chamber of corresponding size in the position department of closing resistor of upside, can not produce the influence to explosion chamber barrel in radial and axial overall dimension.
Description
Technical Field
The utility model relates to the technical field of circuit breaker equipment, in particular to a circuit breaker.
Background
The high-voltage switch equipment and GIS products gradually develop to be compact, and particularly, the power grid users propose standard interval requirements, so that the miniaturization of the high-voltage switch equipment is realized on the premise of ensuring the convenience of product operation and maintenance. At present, in order to prevent overvoltage of switching-on operation, a switching-on resistor is generally installed on a breaker with high voltage level to reduce the damage of overvoltage so as to ensure the safe operation of a power system. In the prior art, a switching-on resistor is connected in a main circuit in a serial or parallel mode, for example, an utility model patent with an issued bulletin number of CN2896495Y provides a double-break tank type circuit breaker arc-extinguishing chamber, the arc-extinguishing chamber comprises an arc-extinguishing chamber cylinder (namely an arc-extinguishing chamber tank body in the patent), an operating mechanism is arranged at the lower side of the arc-extinguishing chamber cylinder, the operating mechanism comprises an insulating pull rod which reciprocates along the up-down direction, a movable support (namely an insulating support cylinder in the patent) for supporting the arc-extinguishing chamber is arranged at the inner side of the arc-extinguishing chamber cylinder, a conductive support structure (namely a support frame in the patent) is fixed on the movable support, the support structure plays a role of supporting the arc-extinguishing chamber on one hand, and the switching-on resistor is fixed at the outer side of the arc-extinguishing chamber (namely an arc-extinguishing unit in the patent) on the other hand.
The problem with the above-mentioned circuit breaker is that the switching-on resistor is arranged at the left and right ends of the explosion chamber for the axial dimension of the explosion chamber barrel needs to increase correspondingly. In addition, a transmission structure for realizing that the closing resistor is connected into the main loop or is in short circuit from the main loop is required to be arranged between the closing resistor and the insulating pull rod, so that the radial size of the arc-extinguishing chamber cylinder body is required to be further increased, the whole size of the arc-extinguishing chamber cylinder body is increased, and the development trend of miniaturization of high-voltage switch equipment is deviated.
Disclosure of Invention
The utility model aims to provide a circuit breaker so as to solve the technical problem that the overall size of an arc-extinguishing chamber cylinder is large when a closing resistor is applied to the circuit breaker in the prior art.
The circuit breaker of the utility model adopts the following technical scheme:
the circuit breaker comprises an arc-extinguishing chamber cylinder fixedly provided with an arc-extinguishing chamber and an operating mechanism arranged on one side of the arc-extinguishing chamber cylinder, wherein the operating mechanism comprises a movable support and an insulating pull rod penetrating the movable support and moving back and forth, the moving direction of the insulating pull rod is perpendicular to the extending direction of the arc-extinguishing chamber cylinder, the extending direction of the arc-extinguishing chamber cylinder is left and right, the moving direction of the insulating pull rod is up and down, the arc-extinguishing chamber is driven to be closed 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-extinguishing chamber cylinder; the circuit breaker comprises a closing resistor accommodating chamber which is used for being covered outside the closing resistor, and the closing resistor accommodating chamber and the operating mechanism are arranged on the upper side and the lower side of the arc-extinguishing chamber cylinder respectively; the circuit breaker also comprises a closing resistor fixed contact and a closing resistor moving contact, wherein the closing resistor fixed contact comprises fixed contact split bodies which are arranged on the two electric conductors, and the closing resistor moving contact is used for extending into and being clamped between the two fixed contact split bodies so as to short the closing resistor, and is also used for being separated from the two fixed contact split bodies so as to connect the closing resistor into a main loop; the circuit breaker also comprises a transmission part connected with the insulating pull rod, the arc extinguish chamber and the switching-on resistance moving contact, wherein the transmission part is used for driving the arc extinguish chamber to switch on and driving the switching-on resistance moving contact to move upwards and be contacted and conducted with the switching-on resistance fixed contact when switching on, and is also used for driving the arc extinguish chamber to switch off and driving the switching-on resistance moving contact to move downwards and be separated from the switching-on resistance fixed contact when switching off; the transmission part comprises a reversing transmission part arranged between the insulating pull rod and the arc extinguish chamber and a driving part used for driving the switching-on resistor moving contact to move up and down, wherein the driving part comprises a pull-down part and a push-up part which are sequentially arranged at intervals along the up-down direction, the pull-down part is used for pulling the switching-on resistor moving contact downwards, the push-up part is used for pushing the switching-on resistor moving contact upwards, and the switching-on resistor moving contact is slidably assembled on a part, located between the pull-down part and the push-up part, of the driving part along the up-down direction.
The beneficial effects are that: in the circuit breaker provided by the utility model, the switching-on resistor is connected in series in the main loop, and is arranged at the position corresponding to the upper and lower positions of the insulating pull rod, so that the radial dimension of the arc-extinguishing chamber cylinder body is not required to be additionally increased after the switching-on resistor is increased, and only a switching-on resistor accommodating chamber is required to be additionally arranged at one side of the arc-extinguishing chamber cylinder body. The radial and axial dimensions of the arc-extinguishing chamber cylinder body are not increased, and the circuit breaker is compact. In order to meet the requirement that when the main circuit is switched on, the switching-on resistor is connected in the main circuit and is short-circuited after the main circuit is switched on, and when the main circuit is switched off, the switching-on resistor is connected in the main circuit to perform the next switching-on operation; the transmission part is arranged in the utility model to realize the function, and the driving part has idle stroke when the moving contact of the closing resistor is pulled down, so that the requirement that the closing resistor is connected into the main circuit after the main circuit is disconnected during opening is met. The closing resistance moving contact can be clamped between two fixed contact split bodies of the closing resistance moving contact, so that after the push-up part of the driving piece is separated from the closing resistance moving contact, the closing resistance moving contact and the closing resistance moving contact are relatively fixed, and the closing resistance moving contact can be pulled downwards only after the pull-down part is contacted with the closing resistance moving contact so as to realize the separation from the closing resistance moving contact, and the purpose of lagging movement of the closing resistance moving contact is realized in the process.
Further, the fixed contact is divided into two reeds, and the two reeds are used for clamping the moving contact of the closing resistor in a matched mode.
The beneficial effects are that: the spring force and the conductivity of the reeds are good, after the closing resistor moving contact enters between the two reeds, the two reeds can clamp the closing resistor moving contact well, and the situation that the closing resistor is re-connected into the main loop to influence the normal current of the main loop is avoided.
Further, the driving piece comprises a rod body extending up and down, the closing resistor moving contact is sleeved on the rod body in a sliding mode, the push-up part is an annular step arranged on the rod body, and the pull-down part is an impact head arranged at the upper end of the rod body.
The beneficial effects are that: the switching-on resistance moving contact is sleeved on the rod body in a sliding manner, and the annular step and the impact head are arranged, so that the structure is favorable for realizing push-up and pull-down of the switching-on resistance moving contact, and can ensure the anti-drop assembly between the switching-on resistance moving contact and the rod body.
Further, two guide cylinders extending in the up-down direction are arranged on the movable support, guide rods are assembled in the guide cylinders in a guiding and moving mode, and the guide rods are connected with the moving contact of the closing resistor.
The beneficial effects are that: the position of the switching-on resistance moving contact and the track of up-and-down movement can be accurately guided through the guide cylinder and the guide rod, so that the switching-on resistance moving contact can reliably enter between two static contact split bodies of the switching-on resistance static contact.
Further, a return spring is arranged between the guide cylinder and the guide rod to provide downward elastic force for the closing resistance moving contact
The beneficial effects are that: the reset spring provides downward elastic force for the switching-on resistance moving contact, so that the switching-on resistance moving contact is easier to break away from between the two fixed contact split bodies when the switching-on resistance moving contact is disconnected; after the movable contact slides out, the return spring can enable the movable contact of the closing resistor to quickly and accurately return to the original position.
Further, the reversing transmission piece comprises a crank arm hinged on the conductor, one end of the crank arm is connected with the arc extinguishing chamber, and the other end of the crank arm is directly or indirectly connected with the insulating pull rod through a connecting rod.
The beneficial effects are that: the transmission structure of the crank arm and the pull rod 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.
Further, the closing resistor comprises resistor split bodies which are arranged on the two conductors, the resistor split bodies of the two conductors are in conductive communication through a conductive plate, and the closing resistor static contact is positioned below the conductive plate.
The beneficial effects are that: the resistance components of the two conductors are electrically connected through the conductive plate, so that the resistance of the switching-on resistor can be improved, the heat which can be converted during switching-on is higher, and the effect of protecting the main loop contact is more obvious.
Further, the resistor split extends in the up-down direction.
The beneficial effects are that: the resistor split body extends along the up-down direction, so that the occupied space of the closing resistor in the left-right direction can be reduced, and the overall size of the arc-extinguishing chamber cylinder body in the radial direction and the axial direction can be reduced.
Further, an insulating plate is arranged between the conducting plate and the closing resistor static contact.
The beneficial effects are that: the insulating plate can prevent the split of the two fixed contacts from being communicated through the conducting plate, so that the switching-on resistor is short-circuited when the switching-on resistor moving contact and the switching-on resistor fixed contact are not connected.
Further, 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.
The beneficial effects are that: the movable support adopts a metal structure, so that the movable support has better supporting performance, and the insulating pad can prevent the two conductors from being conducted through the movable support and keep mutual insulation between the two conductors.
Drawings
Fig. 1 is a schematic diagram of a circuit breaker provided by the present utility model;
fig. 2 is a schematic view of the structure of the inside of the arc chute barrel of fig. 1 (only one side structure is shown);
FIG. 3 is a schematic diagram of the structure of the closing resistor, left conductor, right conductor;
FIG. 4 is a schematic diagram of the drive member and the left and right arc extinguishing chambers;
FIG. 5 is a schematic diagram of the driving member and the moving contact of the closing resistor;
fig. 6 is a schematic diagram of the cooperation of the moving contact of the closing resistor and the static contact of the closing resistor.
The names of the corresponding components in the figures are:
100. an arc extinguishing chamber cylinder; 101. a closing resistor accommodating chamber; 200. a movable support; 201. an insulating pad; 202. a left conductor; 203. a left reed; 204. a right conductor; 205. a right reed; 206. a right arc extinguishing chamber; 207. a guide cylinder; 208. a guide rod; 209. a switching-on resistor moving contact; 210. a return spring; 300. an operating mechanism; 301. an insulating pull rod; 302. a driving member; 303. an annular step; 304. an impact head; 305. a left crank arm; 306. a first link; 307. a movable end conducting rod; 400. a closing resistor; 401. a first resistor split; 402. a second resistor split; 403. a third resistor split; 404. a fourth resistor split; 405. a conductive plate; 406. an insulating plate; 407. and a conductive block.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the utility model, i.e., the embodiments described are merely some, but not all, of the embodiments of the utility model. The components of the embodiments of the present utility model 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 utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.
It should be noted that in the present embodiment, 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. Moreover, terms such as "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, the phrase "comprising one … …" or the like, as may occur, does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the depicted element.
In the description of the present utility model, the terms "mounted," "connected," "coupled," and "connected," as may be used broadly, and may be connected, for example, fixedly, detachably, or integrally, unless otherwise specifically defined and limited; can be mechanically or electrically connected; either directly, indirectly through intermediaries, or in communication with the interior of the two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art in specific cases.
In the description of the present utility model, unless explicitly stated and limited otherwise, the term "provided" as may occur, for example, as an object of "provided" may be a part of a body, may be separately arranged from the body, and may be connected to the body, and may be detachably connected or may be non-detachably connected. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art in specific cases.
The present utility model is described in further detail below with reference to examples.
Example 1 of the circuit breaker in the present utility model:
as shown in fig. 1 and 2, the circuit breaker provided in this embodiment is a double-break circuit breaker, the circuit breaker includes an arc-extinguishing chamber cylinder 100 and an operating mechanism 300, the operating mechanism 300 includes a movable support 200 and an insulating pull rod 301 arranged in the arc-extinguishing chamber cylinder 100, two arc-extinguishing chambers are further installed in the arc-extinguishing chamber cylinder 100 and supported on the movable support 200 through a supporting structure, a closing resistor 400 is connected between the two arc-extinguishing chambers, a closing resistor fixed contact and a closing resistor movable contact 209 are further arranged in the arc-extinguishing chamber cylinder 100, and the insulating pull rod 301 is respectively connected with the arc-extinguishing chambers and the closing resistor movable contact 209 through transmission components so as to drive the opening and closing of the arc-extinguishing chambers, and the contact and separation of the closing resistor movable contact and the closing resistor fixed contact. For convenience of description, the extending direction of the arc extinguishing chamber cylinder 100 is defined as a left-right direction, and the moving direction of the insulating rod 301 is defined as an up-down direction.
Specifically, as shown in fig. 1 and 2, the operating mechanism 300 is disposed at the lower side of the arc chute body 100 and near the middle position of the arc chute body 100, and the operating mechanism 300 includes an insulating rod 301 and a movable bracket 200 that reciprocate in the up-down direction. The movable support 200 is located at the opening of the arc-extinguishing chamber cylinder 100, the movable support 200 is made of metal materials, a supporting structure is mounted on the upper side of the movable support 200, the supporting structure comprises two conductors, the two conductors are a left conductor 202 and a right conductor 204 and are located in a main loop, the left conductor 202 and the right conductor 204 are arranged on the movable support 200 at intervals along the left-right direction, the left conductor 202 and the right conductor 204 are mutually insulated, in order to prevent conduction between the left conductor 202 and the right conductor 204, an insulating pad 201 is fixed on the upper end of the movable support 200, the left conductor 202 and the right conductor 204 are supported on the insulating pad 201 and are prevented from being mutually communicated, the tops of the left conductor 202 and the right conductor 204 are connected through a closing resistor 400, the closing resistor 400 is located above the left conductor 202 and the right conductor 204 and protrudes out of the arc-extinguishing chamber cylinder 100, a closing resistor accommodating chamber 101 is arranged on the upper side of the arc-extinguishing chamber cylinder 100, and 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 arranged on the upper side and the lower side of the arc extinguishing chamber cylinder 100 in a vertically opposite manner.
In this embodiment, the two arc-extinguishing chambers are a left arc-extinguishing chamber (not shown in the figure) and a right arc-extinguishing chamber 206, the left arc-extinguishing chamber comprises 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 mounted on the left side of the left electric conductor 202, as shown in fig. 2, the right arc-extinguishing chamber 206 comprises 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 mounted on the right side of the right electric conductor 204. As shown in fig. 3, the closing resistor 400 includes a first resistor sub-body 401, a second resistor sub-body 402, a third resistor sub-body 403, and a fourth resistor sub-body 404, where the first, second, third, and fourth resistor sub-bodies all extend in the up-down direction, the first, second resistor sub-bodies are disposed on the left conductor 202, the third, fourth resistor sub-bodies are disposed on the right conductor 204, the upper ends of the first, second resistor sub-bodies are connected by a conductive block 407, the upper ends of the third, fourth resistor sub-bodies are also connected by a conductive block 407, and the lower ends of the second, third resistor sub-bodies 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 to the left conductor 202 through the left arc extinguishing chamber, the current flows to the right conductor 204 through the first, second, third and fourth resistor components in sequence, and finally flows to the outside of the arc extinguishing chamber cylinder 100 through the right arc extinguishing chamber 206. When the switching resistor 400 is shorted from the main circuit, the current in the main circuit flows to the left conductor 202 through the left arc-extinguishing chamber, the current flows to the right conductor 204 through the switching resistor moving contact 209 and the switching resistor static contact, and finally flows to the outside of the arc-extinguishing chamber cylinder 100 through the right arc-extinguishing chamber 206.
As shown in fig. 3, 5 and 6, the closing resistor static contact is located below the conductive plate 405, and the closing resistor static contact includes a static contact split body that is 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 a side of the left conductive body 202 facing the right conductive body 204, and the right reed 205 is disposed on a 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 resistor moving contact 209 is matched with the interval between the left reed 203 and the right reed 205, when the closing resistor moving contact 209 stretches into the space between the left reed 203 and the right reed 205, the left reed 203 and the right reed 205 clamp the closing resistor moving contact 209, when the closing resistor moving contact 209 stretches into the space between the left reed 203 and the right reed 205 and is clamped, the closing resistor moving contact 209 and the closing resistor fixed contact realize conduction and short-circuit the closing resistor 400, when the closing resistor moving contact 209 is positioned below the left reed 203 and the right reed 205, the closing resistor moving contact 209 and the closing resistor fixed contact are separated and disconnected, and the closing resistor 400 is connected into a main loop.
As shown in fig. 3, in order to prevent the conductive plate 405 from being in erroneous contact with the left reed 203 and the right reed 205 and shorting the closing resistor 400 when in use, an insulating plate 406 is fixed between the conductive plate 405 and the closing resistor fixed contact, wherein the insulating plate 406 is fixed on the left conductive body 202 and the right conductive body 204, and the second resistor split body 402 and the third resistor split body 403 are supported on the insulating plate 406.
When the utility model is used, before the moving contact and the fixed contact of the main circuit are switched on, the separation of the moving contact 209 and the fixed contact of the switching resistor is required to be ensured, the switching resistor 400 is connected into the main circuit, and after the main circuit is conducted, the moving contact and the fixed contact of the switching resistor are connected to short-circuit the switching resistor 400, so that the normal current is ensured; when the switch is opened, the switch-on resistor moving contact 209 and the switch-on resistor fixed contact are prevented from being electrified to be opened, when the moving contact and the fixed contact of the main circuit are opened, the switch-on resistor 400 is required to be in a short-circuited state, and after the moving contact and the fixed contact of the main circuit are opened, the switch-on resistor moving contact 209 and the switch-on resistor fixed contact are separated, so that preparation is made for next switch-on. That is, when the switch is closed, the moving and fixed contacts of the main loop are conducted before the moving contact 209 of the switch resistor and the fixed contact of the switch resistor, and when the switch is opened, the moving contact 209 of the switch resistor and the fixed contact of the switch resistor lag behind the moving and fixed contacts of the main loop to be disconnected.
The transmission component includes a reversing transmission component and a driving component 302, as shown in fig. 4, the driving component 302 is hinged at the upper end of the insulating pull rod 301, the driving component 302 includes a rod body extending along the up-down direction, the rod body is provided with an annular step 303 and an impact head 304, 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 in a block structure and is slidably sleeved on the rod body and is located between the annular step 303 and the impact head 304. Of course, in actual processing, in order to ensure that the closing resistor moving contact 209 can be sleeved outside the rod body, the striking head 304 or the annular step 303 needs to be designed into a detachable structure. As shown in fig. 3 and 4, in order to avoid the rod body, avoidance holes are formed on the insulating plate 406 and the conductive plate 405, so that the rod body and the impact head 304 on the top of the rod body can pass through. The annular step 303 is used for pushing the closing resistor moving contact 209 upwards to be a push-up part, and the striking head 304 is used for pulling the closing resistor moving contact 209 downwards to be a pull-down part. Moreover, since the length of the closing resistor moving contact 209 in the up-down direction is smaller than the distance between the striking head 304 and the annular step 303, the closing resistor moving contact 209 can slide up and down, and even if the annular step 303 is separated from the closing resistor moving contact 209, the closing resistor moving contact 209 can be kept clamped in the closing resistor fixed contact until the striking head 304 pulls down the closing resistor moving contact 209, that is, the driving member 302 has a certain 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 along the up-and-down direction is arranged on the insulating pad 201 on the moving support 200, a guide rod 208 is assembled 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 along the up-and-down direction in a guiding manner, in addition, in order to enable the closing resistor moving contact to reset rapidly, a reset spring 210 is also assembled between the guide rod 208 and the guide cylinder 207, and the reset 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, and here, the left driving contact is taken as an example for illustration, 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 hinge point is hinged on the left electric conductor 202, one hinge point is hinged on the driving member 302 through the first connecting rod 306, and in particular, is hinged on the annular step 303 of the driving member 302. The last hinge point of the left crank arm 305 is hinged to the movable end conductive rod 307 of the arc extinguishing chamber through a second connecting rod (not shown in the figure). When in use, when the insulating pull rod 301 moves upwards, the first connecting rod 306 drives the crank arms (comprising the left crank arm and the right crank arm) to swing, the crank arms swing to drive the arc extinguishing chamber to perform switching-on operation, and when the insulating pull rod 301 moves downwards, the arc extinguishing chamber is driven to perform switching-off operation.
In actual design and processing, the requirements in closing are met by reasonably setting the shape of the crank arm, the height of the annular step 303 and the distance between the closing resistance moving contact 209 and the closing resistance fixed contact, and the requirements in opening are met by downward idle stroke of the driving piece 302.
The use process is as follows: when the switch is closed, the insulating pull rod 301 moves upwards under the drive of the operating mechanism 300, the right driving contact moves rightwards under the drive of the driving piece 302, the left driving contact moves leftwards, the switch-on resistance moving contact 209 moves upwards under the pushing of the annular step 303, after the right driving contact and the left driving contact are respectively contacted with the corresponding main fixed contacts, the switch-on is completed by the left arc extinguishing chamber and the right arc extinguishing chamber, after the interval of 8-11ms, the switch-on resistance moving contact 209 stretches into between the left reed 203 and the right reed 205 under the pushing of the annular step 303, at the moment, the main loop circulates through the switch-on resistance moving contact 209, and the switch-on resistance 400 is shorted. When the switch is opened, the insulating pull rod 301 descends under the drive of the operating mechanism 300, the right driving contact moves leftwards under the drive of the driving piece 302, the left driving contact moves rightwards, the left arc extinguishing chamber and the right arc extinguishing chamber complete the switch separation, after 3-5ms, the striking head 304 is contacted with the switch-on resistance moving contact 209, the switch-on resistance moving contact 209 withdraws from between the left reed 203 and the right reed 205 under the pull of the striking head 304, and at the moment, the switch-on resistance 400 is re-connected into the main loop.
It should be 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, the structure of the linkage between the left arc-extinguishing chamber and the insulating pull rod 301 and the left arc-extinguishing chamber is cancelled in the single-break circuit breaker, only a right arc-extinguishing chamber 206 is provided in the arc-extinguishing chamber cylinder 100, at this time, the arc-extinguishing chamber cylinder 100 may omit the portion containing the left arc-extinguishing chamber, the right arc-extinguishing chamber 206 is supported on the movable support 200 via the right conductor 204, the current in the main circuit is communicated with the left conductor 202 after entering the arc-extinguishing chamber cylinder 100, and the other structures are the same as those of the double-break circuit breaker described above, which is not repeated herein.
It should be noted that, in this embodiment, the directions are defined only for convenience of description, and the upper, lower, left and right directions are only relative concepts, and the circuit breaker can be used by turning 90 ° in practical use, which does not limit the specific structure of the circuit breaker.
When the circuit breaker is applied to a use scene with a lower voltage level in actual use, the closing resistor 400 can be taken down, and at the moment, although the moving contact 209 of the closing resistor and the fixed contact of the closing resistor have the condition of electrified closing, the arc discharge ablation degree generated in the closing process is limited, and normal use can be ensured.
Example 2 of the circuit breaker in the present utility model:
this embodiment differs from embodiment 1 in that in embodiment 1 the reversing gear comprises a crank arm and a connecting rod. In the embodiment, the reversing transmission piece comprises a pushing head, a sliding block and a reset elastic piece, wherein the pushing head is arranged on the driving piece, the sliding block is arranged on a movable contact rod for pushing the driving contact, an inclined surface which is in pushing fit with the pushing head is arranged on the sliding block, and the reset elastic piece is arranged between the movable contact rod and the corresponding conductor; when the insulating pull rod is upwards, the pushing head on the driving piece pushes the corresponding sliding block, the sliding block drives the corresponding movable contact rod to act, closing of the arc extinguishing chamber is completed, and the reset elastic piece is in a compressed state; when the insulating pull rod descends, 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 extinguishing chamber is completed.
Example 3 of the circuit breaker in the present utility model:
the present embodiment is different from embodiment 1 in that in embodiment 1, the resistor split body extends in the up-down direction. In this embodiment, the extending direction of the resistor split is identical to the extending direction of the arc extinguishing chamber cylinder.
Example 4 of the circuit breaker in the present utility model:
the present embodiment is different from embodiment 1 in that in embodiment 1, the closing resistor includes four resistor split bodies. In this embodiment, the switching resistor is a whole, and the whole is in a U-shaped structure, and two ends of the switching resistor are respectively connected with the left and right conductors, so as to connect the left and right conductors.
Example 5 of the circuit breaker in the present utility model:
the present embodiment is different from embodiment 1 in that in embodiment 1, the closing resistor housing chamber is a cylindrical cylinder. In this embodiment, the closing resistor accommodating chamber is a spherical housing.
Example 6 of the circuit breaker in the present utility model:
the present embodiment is different from embodiment 1 in that in embodiment 1, a closing resistor moving contact is guided by means of a guide cylinder and a guide rod. In this embodiment, the movable support is not provided with a conductive torch and a conductive rod, and the closing resistor movable contact is slidably sleeved on the rod body of the driving member, so as to prevent the closing resistor movable contact from rotating, the rod body is designed into a square rod, and correspondingly, square holes corresponding to the square rod are formed in the closing resistor movable contact.
Example 7 of the circuit breaker of the utility model:
the present embodiment is different from embodiment 1 in 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 is used as the push-up portion, and the impact head is used as the pull-down portion. In other embodiments, the driving piece comprises two vertical plates which are arranged in parallel, the two vertical plates are provided with sliding grooves which extend up and down, the switching-on resistance moving contact is positioned between the two vertical plates, guide rods are arranged on two sides of the switching-on resistance moving contact, and the guide rods penetrate into the sliding grooves on the corresponding side vertical plates. When the driving piece moves upwards, the bottom groove wall of the chute pushes the guide rod and the moving contact of the closing resistor where the guide rod is positioned to move upwards; when the driving piece moves downwards, the top groove wall of the sliding groove is not contacted with the guide rod in the initial stage, and after the driving piece moves downwards for a certain distance, the top groove wall of the sliding groove is contacted with the guide rod to push the closing resistance moving contact downwards, so that the separation between the closing resistance moving contact and the closing resistance fixed contact is realized. In this embodiment, a push-up part for pushing the closing resistor moving contact to move towards the closing resistor fixed contact is formed on the bottom groove wall of the chute, and a pull-down part for pulling the closing resistor moving contact to be separated from the closing resistor fixed contact is formed on the top groove wall.
Example 8 of the circuit breaker in the present utility model:
the present embodiment is different from embodiment 1 in that in embodiment 1, the crank arm is indirectly connected to the driving member through 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 insulating pull rod.
Example 9 of the circuit breaker in the present utility model:
the present embodiment is different from embodiment 1 in that in embodiment 1, the fixed contact is a reed separately. In this embodiment, the static contact is split into conductive elastic pieces, the elastic pieces are split and arranged on the left and right conductors and form an open structure in the direction towards the closing resistor moving contact, when the closing resistor moving contact enters between the elastic pieces on the left and right conductors, the elastic pieces can clamp the closing resistor moving contact, and when the closing resistor moving contact is pulled down, the closing resistor moving contact can slide out from between the elastic pieces. In other embodiments, the static contact can be two rigid conductive blocks, the two conductive blocks are separately arranged on the left and right conductive bodies, at this time, an elastic piece is arranged on the closing resistor moving contact, when the closing resistor moving contact enters between the two conductive blocks, the elastic piece is propped against the two conductive blocks, the closing resistor moving contact can be clamped between the two conductive blocks by using the propping force of the elastic piece, and when the closing resistor moving contact is separated, only a lower pulling force larger than the propping force is applied to the closing resistor moving contact, and the closing resistor moving contact can slide out from between the two conductive blocks.
Example 10 of the circuit breaker of the utility model:
the present embodiment is different from embodiment 1 in that in embodiment 1, an insulating plate is arranged between a conductive plate and a closing resistor fixed contact. In this embodiment, when the distance between the conductive plate and the fixed contact of the closing resistor is long, the insulating plate may be omitted.
Example 11 of the circuit breaker in the present utility model:
the present embodiment is different from embodiment 1 in that in embodiment 1, the movable support is a metal support. In this embodiment, the movable support is made of an insulating material, and an insulating pad is not required to be disposed between the movable support and the left and right conductors.
The above description is only a preferred embodiment of the present utility model, and the patent protection scope of the present utility model is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The circuit breaker comprises an arc-extinguishing chamber cylinder (100) fixedly provided with an arc-extinguishing chamber and an operating mechanism (300) arranged on one side of the arc-extinguishing chamber cylinder (100), wherein the operating mechanism (300) comprises a movable support (200) and an insulating pull rod (301) penetrating the movable support (200) and moving back and forth, the moving direction of the insulating pull rod (301) is perpendicular to the extending direction of the arc-extinguishing chamber cylinder (100), the extending direction of the arc-extinguishing chamber cylinder (100) is the left-right direction, the moving direction of the insulating pull rod (301) is the up-down direction, the insulating pull rod (301) drives the arc-extinguishing chamber to close when moving upwards, and a supporting structure which is supported on the movable support (200) and is positioned in a main loop is arranged in the arc-extinguishing chamber cylinder (100); the circuit breaker is characterized by comprising two conductors which are arranged in a split mode along the left-right direction, wherein the two conductors are mutually insulated, the upper ends of the two conductors are connected through a switching-on resistor (400), the switching-on resistor (400) protrudes upwards to be arranged in the arc-extinguishing chamber cylinder body (100), the circuit breaker comprises a switching-on resistor accommodating chamber (101) which is used for being covered outside the switching-on resistor (400), and the switching-on resistor accommodating chamber (101) and an operating mechanism (300) are arranged on the upper side and the lower side of the arc-extinguishing chamber cylinder body (100) in a split mode; the circuit breaker also comprises a closing resistor fixed contact and a closing resistor moving contact (209), wherein the closing resistor fixed contact comprises fixed contact split bodies which are arranged on the two electric conductors, the closing resistor moving contact (209) is used for extending into and being clamped between the two fixed contact split bodies so as to short the closing resistor (400), and is also used for being separated from the two fixed contact split bodies so as to connect the closing resistor (400) into a main loop; the circuit breaker further comprises a transmission part connected with the insulating pull rod (301), the arc extinguishing chamber and the closing resistor moving contact (209), wherein the transmission part is used for driving the arc extinguishing chamber to close and driving the closing resistor moving contact (209) to move upwards and be contacted and conducted with the closing resistor fixed contact when closing, and is also used for driving the arc extinguishing chamber to break and driving the closing resistor moving contact (209) to move downwards and be separated from the closing resistor fixed contact when breaking; the transmission part comprises a reversing transmission part arranged between the insulating pull rod (301) and the arc extinguishing chamber, and further comprises a driving part (302) used for driving the closing resistor moving contact (209) to move up and down, the driving part (302) comprises a pull-down part and a push-up part which are sequentially arranged at intervals along the up-down direction, the pull-down part is used for pulling the closing resistor moving contact (209) downwards, the push-up part is used for pushing the closing resistor moving contact (209) upwards, and the closing resistor moving contact (209) is assembled on a part, located between the pull-down part and the push-up part, of the driving part (302) in a sliding manner along the up-down direction.
2. The circuit breaker according to claim 1, characterized in that the fixed contact is split into two spring plates for cooperating with clamping closing resistance moving contacts (209).
3. The circuit breaker according to claim 1, wherein the driving member (302) comprises a rod body extending up and down, the closing resistor moving contact (209) is slidably sleeved on the rod body, the push-up portion is an annular step (303) arranged on the rod body, and the pull-down portion is an impact head (304) arranged at the upper end of the rod body.
4. A circuit breaker according to claim 3, characterized in that the movable support (200) is provided with two guide cylinders (207) extending in the up-down direction, a guide rod (208) is assembled in the guide cylinders (207) in a guide movement manner, and the guide rod (208) is connected with the closing resistance movable contact (209).
5. The circuit breaker according to claim 4, characterized in that 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 moving contact (209).
6. The circuit breaker according to any one of claims 1 to 5, characterized in that the reversing transmission comprises a lever hinged to the electrical conductor, one end of the lever being connected to the arc extinguishing chamber and the other end being directly or indirectly connected to the insulating tie rod by a connecting rod.
7. The circuit breaker according to any of the claims 1 to 5, characterized in that the closing resistor (400) comprises a resistor split on two electrical conductors, the resistor split of the two electrical conductors being electrically connected by a conductive plate (405), the closing resistor stationary contact being located below the conductive plate (405).
8. The circuit breaker of claim 7, wherein the resistor segments extend in an up-down direction.
9. The circuit breaker according to claim 7, characterized in that an insulating plate (406) is provided between the conductive plate (405) and the closing resistor static contact.
10. Circuit breaker according to any of claims 1 to 5, characterized in that the movable support (200) is a metal support provided with an insulating pad (201), the electrical conductor being 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114783816A CN114783816A (en) | 2022-07-22 |
| CN114783816B true CN114783816B (en) | 2024-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111593312.4A Active CN114783816B (en) | 2021-12-23 | 2021-12-23 | Circuit breaker |
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| Country | Link |
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| CN (1) | CN114783816B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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|---|---|---|---|---|
| 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 |
| US5354959A (en) * | 1992-04-14 | 1994-10-11 | Mitsubishi Denki Kabushiki Kaisha | Circuit breaker |
| 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 |
| CN101635221A (en) * | 2009-06-24 | 2010-01-27 | 河南平高电气股份有限公司 | Extra-high voltage breaker and extra-high over-voltage preventing system with same |
| 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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2021
- 2021-12-23 CN CN202111593312.4A patent/CN114783816B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN101635221A (en) * | 2009-06-24 | 2010-01-27 | 河南平高电气股份有限公司 | Extra-high voltage breaker and extra-high over-voltage preventing system with same |
| 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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| Publication number | Publication date |
|---|---|
| CN114783816A (en) | 2022-07-22 |
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