CN112614740A - Low-operation power vacuum circuit breaker - Google Patents
Low-operation power vacuum circuit breaker Download PDFInfo
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- CN112614740A CN112614740A CN202011388648.2A CN202011388648A CN112614740A CN 112614740 A CN112614740 A CN 112614740A CN 202011388648 A CN202011388648 A CN 202011388648A CN 112614740 A CN112614740 A CN 112614740A
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- 230000007246 mechanism Effects 0.000 claims abstract description 53
- 230000005540 biological transmission Effects 0.000 claims abstract description 36
- 230000033001 locomotion Effects 0.000 claims abstract description 10
- 238000005096 rolling process Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 28
- 230000000903 blocking effect Effects 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 37
- 238000000034 method Methods 0.000 description 8
- 230000003068 static effect Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910018503 SF6 Inorganic materials 0.000 description 4
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 4
- 229960000909 sulfur hexafluoride Drugs 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention relates to a low-operation power vacuum circuit breaker. The low-operation power vacuum circuit breaker comprises a switch body and an operating mechanism; the switch body comprises a piston and a piston cylinder body, and a low-pressure air chamber is arranged on one side of the piston, which is back to the vacuum arc-extinguishing chamber; the piston is used for receiving acting force towards the low-pressure air chamber under the action of the air pressure difference between the main shell and the low-pressure air chamber; the transmission mechanism is arranged in the low-pressure air chamber and is used for driving the piston to move in a guiding way in a four-bar mechanism mode; the switch body still includes: the supporting wheel is arranged on the piston or a connecting piece fixedly connected with the piston and positioned on one side of the piston close to the low-pressure air chamber; the rotation axis of the supporting wheel is vertical to the motion plane of the four-bar mechanism; the supporting wheel is supported on the roller wheel matching surface on the inner wall of the piston cylinder body in a rolling mode and used for balancing the radial force applied to the piston under the action of the four-bar mechanism. Above-mentioned scheme can solve current vacuum circuit breaker because the higher problem of self-closing power problem to operating device's performance requirement.
Description
Technical Field
The invention relates to a low-operation power vacuum circuit breaker.
Background
With the development of economic society and the enhancement of environmental awareness of people, the environmental protection of high-voltage switch equipment becomes an important development direction, sulfur hexafluoride insulating gas has the greatest harm to the environment in the high-voltage switch industry, the greenhouse effect coefficient is very high, the stability is good, once the sulfur hexafluoride insulating gas is discharged into the atmosphere, the greenhouse effect influence is huge and lasting, and the research of fluorine-free high-voltage switch equipment becomes a hotspot. The arc extinguish chamber of the vacuum circuit breaker adopts a vacuum structure, and the arc extinguish chamber is insulated by nitrogen to the ground, so that the usage amount of sulfur hexafluoride is reduced to zero, the environmental protection performance of the equipment is obviously improved, and the scheme becomes an example of the fluorine-free high-voltage switch equipment.
However, since the opening and closing unit of the vacuum circuit breaker adopts a vacuum sealing structure, the moving contact of the vacuum circuit breaker needs to bear self-closing force generated by pressure difference between the inside and the outside of the arc extinguish chamber, and the self-closing force needs to overcome larger resistance when the moving contact moves towards the opening direction, so that the circuit breaker needs to overcome the self-closing force and consume energy when performing opening operation.
Disclosure of Invention
The invention aims to provide a low-operation vacuum circuit breaker, which solves the problem that the performance of an operating mechanism is higher in the conventional vacuum circuit breaker due to the self-closing force problem.
The invention adopts the following technical scheme:
the low-operation power vacuum circuit breaker comprises a switch body and an operating mechanism; the switch body includes:
the main shell is used for filling insulating gas, and a vacuum arc extinguish chamber is arranged in the inner cavity of the main shell;
the transmission mechanism is arranged on one side of the main shell and is used for being in transmission connection between the movable end of the vacuum arc extinguish chamber and the operating mechanism;
the switch body still includes:
the piston is arranged on a force transmission path between the transmission mechanism and the vacuum arc-extinguishing chamber to form a part of the force transmission path;
the piston cylinder body is used for guiding, sealing and assembling the piston;
the low-pressure air chamber is arranged on one side of the piston, which is back to the vacuum arc-extinguishing chamber, and is used for filling gas with pressure lower than the air pressure in the main shell;
the piston is used for bearing acting force towards the low-pressure air chamber under the action of air pressure difference between the main shell and the low-pressure air chamber, so that partial opening driving force is provided for opening of the circuit breaker;
the transmission mechanism is arranged in the low-pressure air chamber and comprises a swing arm, and the swing arm is used for driving the piston to move in a guiding manner in a four-bar mechanism mode when swinging;
the switch body still includes:
the supporting wheel is arranged on the piston or a connecting piece fixedly connected with the piston and positioned on one side of the piston close to the low-pressure air chamber; the rotation axis of the supporting wheel is perpendicular to the motion plane of the four-bar mechanism;
the inner wall of the piston cylinder body is provided with a roller matching surface, and the supporting wheel is supported on the roller matching surface in a rolling manner and used for balancing the radial force applied to the piston under the action of the four-bar mechanism.
Has the advantages that: adopt above-mentioned technical scheme, through setting up suitable piston area and atmospheric pressure difference, the piston can receive the effort towards low-pressure air chamber, this effort can provide part separating brake drive power, thereby can reduce the separating brake power requirement to drive mechanism, the higher problem of requirement of current circuit breaker to separating brake operation power has been improved, and, supporting wheel cooperates with the gyro wheel fitting surface on the piston cylinder body, can balance the radial force that the piston received under four-bar linkage's effect, the setting up of piston has leaded to under the circumstances that the biography power route increases, avoid the driving medium between drive mechanism and the piston to receive too big radial force and the bending deformation problem appears and the piston receives too big problem of radial force, guarantee the accuracy and the reliability of piston motion under high-speed heavy load operating mode.
As a preferred technical scheme: the piston comprises a cylindrical plug body, a blocking body is arranged in the cylindrical plug body or at the axial end part of the cylindrical plug body, and the blocking body is used for isolating the main shell from the low-pressure air chamber.
Has the advantages that: by adopting the technical scheme, the weight of the piston is favorably reduced, the condition that the opening and closing speed is influenced due to overlarge weight of the piston is avoided, and the material is favorably saved.
As a preferred technical scheme: the blocking body is arranged at one end, far away from the low-pressure air chamber, of the piston.
Has the advantages that: adopt above-mentioned scheme to be convenient for be connected of insulating pull rod and piston to be favorable to guaranteeing the good cooperation of piston and piston cylinder body.
As a preferred technical scheme: the inner hole of the piston cylinder body comprises a small-diameter section and a large-diameter section, the piston is in guide sealing fit with the small-diameter section, and the roller fitting surface is arranged on the large-diameter section.
Has the advantages that: by adopting the technical scheme, the processing area of the piston cylinder body can be reduced, and good matching with the piston is ensured.
As a preferred technical scheme: the two supporting wheels are arranged on two sides of the piston along the axis of the swing arm; and two guide grooves are formed in the inner wall of the piston cylinder body, and the groove side walls of the guide grooves form the roller matching surface.
Has the advantages that: by adopting the technical scheme, the two supporting wheels can provide larger supporting force, and the accuracy and the reliability of the movement of the piston can be better ensured.
As a preferred technical scheme: the two support wheels are arranged on two sides of the piston along a direction perpendicular to the axis of the swing arm; the inner wall of the piston cylinder body facing the central axis forms the roller matching surface.
Has the advantages that: by adopting the technical scheme, the structure is simple, and the processing is convenient.
As a preferred technical scheme: a first connecting rod is arranged on one side of the piston close to the low-pressure air chamber, and a second connecting rod is arranged on one side of the piston far away from the low-pressure air chamber;
the first connecting rod is in transmission connection with the transmission mechanism, and the second connecting rod is in transmission connection with the vacuum arc extinguish chamber;
the supporting wheel is arranged on the first connecting rod.
Has the advantages that: by adopting the technical scheme, the piston can be conveniently arranged on the force transmission path between the transmission mechanism and the contact unit by arranging the connecting rod, so that a part of the force transmission path is formed.
As a preferred technical scheme: and a sliding sealing ring and a guide ring are arranged between the cylinder wall of the piston cylinder body and the peripheral surface of the piston, and the piston is assembled on the piston cylinder body in a guiding and sealing manner through the sliding sealing ring and the guide ring.
Has the advantages that: by adopting the technical scheme, the sealing performance between the piston and the piston cylinder body can be ensured by the sliding sealing ring, the good guide of the piston can be ensured by the guide ring, and meanwhile, the effective sealing of the sliding sealing ring can be ensured.
As a preferred technical scheme: the piston cylinder body is a revolution body structure, including:
the cylinder part is used for guiding, sealing and assembling the piston;
the flange part is connected to the outer peripheral surface of the cylinder part and clamped between the end flange of the main shell and the end flange of the low-pressure air chamber;
the flange part is arranged at one axial end of the cylinder part, and the other end of the cylinder part is inserted into the main shell.
Has the advantages that: by adopting the technical scheme, the piston cylinder body is convenient to install.
As a preferred technical scheme: an annular interval is arranged between the cylinder body part and the inner wall of the main shell, a gas guide pipe is hermetically connected to the area, corresponding to the annular interval, of the flange part, and the gas guide pipe is communicated with the inner cavity of the main shell;
and an inflation interface is arranged on the chamber wall of the low-pressure air chamber, and one end of the gas conduit, which is far away from the flange part, is communicated with the inflation interface and is used for inflating and discharging insulating gas into and out of the inner cavity of the main shell.
Has the advantages that: by adopting the technical scheme, the normal setting of the low-pressure air chamber is not influenced, and meanwhile, the inflation and deflation requirements of the porcelain column sleeve or the silicon rubber sleeve are met.
For the subject to be protected by the present patent, each preferred technical solution under the same subject may be adopted alone, and when the preferred technical solutions under the same subject can be combined, two or more preferred technical solutions under the same subject may be arbitrarily combined, and the technical solutions formed by the combination are not specifically described here, and are included in the description of the present patent in this form.
Drawings
Fig. 1 is a schematic structural view of embodiment 1 of a low operation power vacuum circuit breaker according to the present invention;
FIG. 2 is a right side view of FIG. 1;
FIG. 3 is a schematic structural diagram of the dual air chamber structure of FIG. 1, which is also a schematic structural diagram of the piston and the piston cylinder;
FIG. 4 is a schematic view of the air pressure force of the dual chamber configuration;
fig. 5 is a gas circuit structural view of a low operation vacuum circuit breaker.
The names of the components corresponding to the corresponding reference numerals in the drawings are: 1. a switch body; 2. a main housing; 3. an end flange; 4. a piston cylinder; 5. a flange portion; 6. a barrel portion; 8. a low pressure plenum housing; 9. a vacuum arc-extinguishing chamber; 10. a high-pressure air chamber; 11. a low-pressure air chamber; 12. sliding the seal ring; 13. a guide ring; 14. a piston; 15. a cylindrical plug body; 16. a plugging body; 171. a first connecting rod; 172. a second connecting rod; 18. an insulating pull rod; 20. a transmission mechanism; 21. a drive shaft; 22. swinging arms; 23. a connecting rod; 30. an operating mechanism; 31. opening a hole; 32. a gas conduit; 33. an inflation interface; 34. a support wheel; 35. a guide groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, which may be present in the embodiments of the present invention, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the statement that "comprises an … …" is intended to indicate that there are additional elements of the same process, method, article, or apparatus that comprise 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; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
In the description of the present invention, unless otherwise specifically stated or limited, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be detachable or non-detachable. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
The present invention will be described in further detail with reference to examples.
as shown in fig. 1 and 2, includes a switch body 1 and an operating mechanism 30. The switch body 1 is a double-air-chamber structure and comprises a main shell 2, a piston cylinder 4, a low-pressure air chamber shell 8, a vacuum arc-extinguishing chamber 9 and a transmission mechanism 20. The main shell 2 and the piston cylinder 4 enclose a high-pressure air chamber 10, the low-pressure air chamber shell 8 and the piston cylinder 4 enclose a low-pressure air chamber 11, the low-pressure air chamber 11 is a relative concept, namely, the pressure is lower than that of the high-pressure air chamber 10, and a double-air chamber structure is formed by the high-pressure air chamber 10 and the low-pressure air chamber 11. The high-pressure gas chamber 10 is used for sealing insulating gas and ensuring the ground insulation performance of the high-voltage conductive part of the circuit breaker.
As shown in fig. 1 and 5, the transmission mechanism 20 is a four-bar mechanism, and has a transmission shaft 21, a swing arm 22 and a connecting rod 23, the transmission shaft 21 is connected with an output rotating shaft of the operating mechanism 30, and is used for forming a slider-crank mechanism to drive the vacuum interrupter 9 to open and close, and to achieve a suitable transmission ratio. This form of the transmission 20 is prior art and will not be described in detail herein. An insulating pull rod 18 and a piston 14 are arranged between the transmission mechanism 20 and the vacuum arc-extinguishing chamber 9 to form a force transmission path for driving the movable end component of the vacuum arc-extinguishing chamber 9 to move. Of course, in other embodiments, other forms of four-bar mechanisms, such as sinusoidal or tangential mechanisms, can be used to drive the piston guiding movement as the swing arm oscillates.
Specifically, as shown in fig. 1, the main casing 2 is a cylindrical structure, end flanges 3 are respectively disposed at ends of the main casing 2 and the low-pressure chamber casing 8 close to each other, the piston cylinder 4 is a solid structure and includes a flange portion 5 and a cylinder portion 6, the flange portion 5 is connected to an outer circumferential surface of the cylinder portion 6, and is sandwiched between the main casing 2 and the end flanges 3 of the low-pressure chamber casing 8, and is in sealing connection with the end flanges 3. The flange portion 5 is provided at one axial end of the cylinder portion 6, and the other end of the cylinder portion 6 is inserted into the main casing 2. As shown in fig. 3, the end of the barrel portion 6 away from the flange portion 5 is provided with a small diameter section, the inner diameter of the small diameter section is smaller than that of the adjacent portion, four ring grooves are arranged on the inner wall of the small diameter section, two ring grooves in the middle form a sealing ring groove for installing the sliding sealing ring 12, and two ring grooves on two sides form a guiding ring groove for installing the guiding ring 13. The piston cylinder 4 is in sliding sealing fit with the piston 14 through the sliding sealing ring 12, different air pressures on two sides of the piston 14 are guaranteed, and guiding sealing assembly of the piston 14 is achieved through guiding fit of the guide ring 13 and the piston 14. The sealing ring groove, the piston 14 and the piston cylinder 4 jointly form a complete sealing structure for separating the gas of the high-pressure gas chamber 10 and the gas of the low-pressure gas chamber 11 and ensuring the stability of the gas pressure of the two gas chambers; the two guide rings 13 are respectively installed in the two guide ring grooves and used for supporting the piston 14, the accuracy of the sliding motion of the piston 14 along the inner wall of the piston cylinder body 4 is ensured, and meanwhile, the sealing performance of the sliding sealing ring 12 is also favorably ensured.
The main casing 2 of the vacuum circuit breaker in this embodiment is a silicone rubber sleeve, and an air path structure adapted to the main casing 2 is required to realize the air charging and discharging of the main casing. Specifically, an annular space is arranged between the cylinder part 6 of the piston cylinder 4 and the inner wall of the main shell 2, an opening 31 is arranged on the flange part 5 of the piston cylinder 4 in a region corresponding to the annular space, a gas conduit 32 is connected to the opening 31 in a sealing manner, and the gas conduit 32 is communicated with the inner cavity of the main shell 2; the wall of the low-pressure air chamber 11, i.e. the low-pressure air chamber shell 8, is provided with an inflation interface 33, and in this embodiment, the inflation interface 33 is a welded valve. The end of the gas conduit 32 remote from the flange portion communicates with a charging port 33 for charging and discharging the insulating gas into and out of the inner cavity of the main housing 2. Of course, in other embodiments, if the main housing 2 is a metal closed housing, a valve may be directly welded to the main housing 2 to inflate the high-pressure air chamber 10 of the main housing 2. If the main housing 2 is a porcelain-cylindrical sleeve, the high-pressure air chamber 10 can be inflated by the above-mentioned arrangement of the gas conduit 32.
As shown in fig. 3, the piston 14 includes a cylindrical plug body 15, a blocking body 16, and a first connecting rod 171 and a second connecting rod 172, which are integrally provided. A blocking body 16 is provided at an axial end of the cylindrical plug body 15 for isolating the main housing 2 from the low-pressure air chamber 11. The two connecting rods are respectively arranged at two axial sides of the plugging body 16, an external thread is arranged on the second connecting rod 172 far away from the low-pressure air chamber 11, the second connecting rod is fixedly connected on the end surface of the insulating pull rod 18 through a thread, the first connecting rod 171 close to the low-pressure air chamber 11 is hinged with the connecting rod 23 of the transmission mechanism 20 to form a transmission connection relation, and the guide motion of the cylindrical plugging body 15 can be realized when the swing arm 22 swings. Wherein, there is a space between the first connecting rod 171 and the inner wall of the cylindrical plug body 15. One end, far away from the piston 14, of the insulating pull rod 18 is fixedly connected with a movable end assembly of the vacuum arc-extinguishing chamber 9, and the insulating pull rod is used for driving the movable end assembly of the vacuum arc-extinguishing chamber 9 to reciprocate to realize switching-on and switching-off of the circuit breaker, wherein the circuit breaker is switched on when moving to the left side in the figure, and the circuit breaker is switched off when moving to the right side in the figure.
As shown in fig. 3, the switch body 1 further includes two support wheels 34, the two support wheels 34 are disposed on two sides of the piston along a direction perpendicular to an axis of the swing arm, and a rotation axis is parallel to the axis of the swing arm and perpendicular to a movement plane of the four-bar mechanism. The support wheel 34 comprises a wheel shaft and a roller, the wheel shaft is fixed on a first connecting rod 171 at the side of the piston 14, which is positioned at the side of the piston close to the low-pressure air chamber; the inner wall of the piston cylinder body is correspondingly provided with two guide grooves 35, the bottom walls of the guide grooves 35 form roller wheel matching surfaces, and the support wheels 34 are supported on the roller wheel matching surfaces in a rolling mode and used for balancing radial force of the piston under the action of the four-bar mechanism. Of course, in other embodiments, the piston cylinder may not have a guide groove, and in this case, the inner wall of the piston cylinder facing the central axis forms a roller engagement surface. The vacuum arc extinguish chamber 9 comprises a movable end component and a static end component, the movable end component comprises a movable main contact and a movable arc contact, the static end component comprises a static main contact and a static arc contact, the static end component is used for closing and opening large current, the vacuum arc extinguish chamber in the prior art can be adopted, and the specific structure is not described in detail here. The operating mechanism 30 in this embodiment is a spring operating mechanism for providing a driving force required to meet the switching performance requirement of the circuit breaker. Of course, in other embodiments, the spring-operated mechanism may be a hydraulically-operated mechanism, an electromagnetically-operated drive mechanism, or other mechanism.
When in use, the high-pressure air chamber 10 corresponding to the main shell 2 is filled with insulating gas with certain pressure, such as sulfur hexafluoride, for ensuring the insulating performance and the on-off performance of the switch body 1; the air pressure in the high-pressure air chamber 10 may be equal to the air pressure in the switch body 1 of the conventional single-chamber structure. The low-pressure air chamber 11 corresponding to the low-pressure air chamber shell 8 can be filled with air to form a certain air pressure, is not filled with air and is isobaric with the outside of the switch body 1, or is vacuumized, and when the low-pressure air chamber 11 is vacuumized, the opening operation of the switch body 1 is facilitated; if the gas is filled, the gas does not need to have insulating and arc extinguishing properties, and the gas can be filled with insulating gas with the same composition as the high-pressure gas chamber 10, can be filled with environment-friendly gas such as nitrogen, and can be filled with dry air or any other possible gas. The self-closing force of the vacuum arc-extinguishing chamber 9 under the action of the high-pressure air chamber 10 is F1(ii) a The gas pressure of the high-pressure gas chamber 10 is P1The corresponding gas acting area on the piston 14 is A1(ii) a The gas of the low-pressure gas chamber 11Body pressure of P2The corresponding gas acting area on the piston 14 is A2Then the air pressure acting force on the piston 14 is F2=P1A1－P2A2By design, P is1A1>P2A2Then the piston 14 is subjected to a pneumatic force F2Namely the increased air pressure driving force in the opening process of the switch device adopting the double-air chamber structure, as shown in figure 4. When the breaker adopting the double-air-chamber structure is subjected to opening operation, the operating mechanism 30 drives the transmission shaft 21 to rotate, the transmission shaft 21 drives the swing arm 22 to swing, the swing arm 22 drives the piston 14 to slide to the low-voltage side of the piston 14 through the connecting rod 23, and the axial acting force F of the piston 14 on the connecting rod 233And an acting force F2The combined action of the insulating pull rod 18 and the driving unit 9 drives the movable end component to move, and the opening operation of the switch device is realized. Through the double-air-chamber structure of the plug, the generated acting force F2The switching-off operation function required by the switching equipment can be reduced, the switching-off operation performance of the switching-off operation mechanism is improved, the operating mechanism 30 with low operation function is adapted, the reliability of the switching equipment is improved, and the production cost is reduced.
Example 2 of the low operation power vacuum circuit breaker of the present invention:
the present embodiment is different from embodiment 1 in that two support wheels 34 are provided on both sides of the piston in a direction perpendicular to the axis of the swing arm in embodiment 1 and supported on the groove bottom wall of the guide groove 35 on the inner wall of the piston cylinder, whereas in this embodiment, two support wheels are provided on both sides of the piston 14 in the axis direction of the swing arm, the axis of rotation is parallel to the axis of the swing arm, and perpendicular to the plane of motion of the four-bar mechanism, and the groove side walls of the guide groove 35 form a roller mating surface. In the process of switching on and switching off, two different groove side walls of the guide groove 35 are respectively used for supporting the supporting wheel.
Example 3 of the low operation power vacuum circuit breaker of the present invention:
the present embodiment is different from embodiment 1 in that the supporting wheel 34 is provided on the first connecting rod 171 of the piston in embodiment 1, whereas the intermediate member is fixed to the end of the first connecting rod 171 of the piston 14 in this embodiment, the intermediate member is connected as a link to the connecting rod of the four-bar mechanism, and the supporting wheel 34 is provided on the intermediate link.
Example 4 of the low operation power vacuum circuit breaker of the present invention:
the present embodiment is different from embodiment 1 in that, in embodiment 1, the piston 14 includes a cylindrical plug body 15, and a blocking body 16 is provided inside or at an axial end of the cylindrical plug body 15, whereas in this embodiment, the piston 14 is a solid cylinder.
Example 5 of the low operation power vacuum circuit breaker of the present invention:
the difference between this embodiment and embodiment 1 is that in embodiment 1, a second connecting rod 172 is disposed on a side of the piston 14 close to the insulating pull rod 18, and is connected to the insulating pull rod 18 through the second connecting rod 172, whereas in this embodiment, a threaded hole is disposed on an end surface of the piston 14 close to the insulating pull rod 18, and the insulating pull rod 18 is directly connected to the threaded hole.
Example 6 of the low operation power vacuum circuit breaker of the present invention:
the present embodiment is different from embodiment 1 in that in embodiment 1, a first connecting rod 171 is provided at a side of the piston 14 facing the low pressure air chamber 11, and is connected to the connecting rod 23 in the transmission mechanism 20 through the first connecting rod 171, and in this embodiment, the connecting rod 23 is directly hinged to the piston 14.
Example 7 of the low operation power vacuum circuit breaker in the present invention:
the present embodiment is different from embodiment 1 in that, in embodiment 1, the piston cylinder 4 includes a cylinder portion 6 and a flange portion 5, the flange portion 5 is provided at one axial end of the cylinder portion 6, and the other end of the cylinder portion 6 is inserted into the main housing 2, whereas in this embodiment, the flange portion 5 is connected to an axial middle portion of the cylinder portion 6.
Example 8 of the low operation power vacuum circuit breaker of the present invention:
the difference between the present embodiment and embodiment 1 is that in embodiment 1, the piston 14 and the insulated pull rod 18 are two separate parts, whereas in the present embodiment, the piston 14 and the insulated pull rod 18 are an integral structure, the piston 14 is disposed at the end of the insulated pull rod 18, and a connector is formed at the end of the insulated pull rod 18.
Example 9 of the low operation power vacuum circuit breaker of the present invention:
the difference between this embodiment and embodiment 1 is that in embodiment 1, the piston cylinder 4 is connected to the main casing 2 through a flange, but in this embodiment, the piston cylinder 4 is provided with an external thread, an end opening of the main casing 2 is provided with an internal thread, and the piston cylinder 4 is screwed to the main casing 2.
The above description is only a preferred embodiment of the present application, and not intended to limit the present application, the scope of the present application is defined by the appended claims, and all changes in equivalent structure made by using the contents of the specification and the drawings of the present application should be considered as being included in the scope of the present application.
Claims (10)
1. The low-operation power vacuum circuit breaker comprises a switch body (1) and an operating mechanism (30); the switch body (1) comprises:
the main shell (2) is used for being filled with insulating gas, and a vacuum arc-extinguishing chamber (9) is arranged in an inner cavity of the main shell (2);
the transmission mechanism (20) is arranged on one side of the main shell (2) and is used for being in transmission connection between the movable end of the vacuum arc-extinguishing chamber (9) and the operating mechanism (30);
it is characterized in that the switch body (1) further comprises:
a piston (14) arranged on a force transmission path between the transmission mechanism (20) and the vacuum arc-extinguishing chamber (9) to form a part of the force transmission path;
the piston cylinder body (4) is used for guiding, sealing and assembling the piston (14);
the low-pressure air chamber (11) is arranged on one side, back to the vacuum arc-extinguishing chamber (9), of the piston (14) and is used for filling gas with pressure lower than the air pressure in the main shell (2);
the piston (14) is used for receiving acting force towards the low-pressure air chamber (11) under the action of the air pressure difference between the main shell (2) and the low-pressure air chamber (11), so that partial opening driving force is provided for the opening of the circuit breaker;
the transmission mechanism (20) is arranged in the low-pressure air chamber (11) and comprises a swing arm (22) which is used for driving the piston (14) to move in a guiding way in a four-bar mechanism mode when the swing arm (22) swings;
the switch body (1) further comprises:
the supporting wheel (34) is arranged on the piston (14) or a connecting piece fixedly connected with the piston (14) and is positioned on one side, close to the low-pressure air chamber (11), of the piston (14); the rotation axis of the supporting wheel (34) is vertical to the motion plane of the four-bar mechanism;
the inner wall of the piston cylinder body (4) is provided with a roller matching surface, and the supporting wheel (34) is supported on the roller matching surface in a rolling manner and used for balancing the radial force of the piston (14) under the action of the four-bar mechanism.
2. The low-operation vacuum circuit breaker according to claim 1, wherein the piston (14) comprises a cylindrical plug body (15), and a blocking body (16) is arranged at the inner part or axial end part of the cylindrical plug body (15), and the blocking body (16) is used for isolating the main shell (2) from the low-pressure air chamber (11).
3. Low-operating vacuum interrupter according to claim 2, characterized in that the blocking body (16) is arranged at the end of the piston (14) remote from the low-pressure gas chamber (11).
4. The low operation vacuum circuit breaker according to claim 1, 2 or 3, wherein the inner bore of the piston cylinder (4) comprises a small diameter section and a large diameter section, the piston (14) is in guide sealing fit with the small diameter section, and the roller fitting surface is arranged on the large diameter section.
5. The low-operation vacuum circuit breaker according to claim 1, 2 or 3, wherein said support wheels (34) are two, and two support wheels (34) are arranged on both sides of the piston (14) along the axis of the swing arm (22); two guide grooves (35) are formed in the inner wall of the piston cylinder body (4), and the groove side walls of the guide grooves (35) form roller matching surfaces.
6. Vacuum interrupter according to claim 1 or 2 or 3, characterized in that there are two support wheels (34), the two support wheels (34) being arranged on either side of the piston (14) in a direction perpendicular to the axis of the swing arm (22); the inner wall of the piston cylinder body (4) facing the central axis forms the roller matching surface.
7. A low operation vacuum circuit breaker according to claim 1, 2 or 3, wherein a first connecting rod (171) is provided at a side of the piston (14) close to the low-pressure gas chamber (11), and a second connecting rod (172) is provided at a side far from the low-pressure gas chamber (11);
the first connecting rod (171) is in transmission connection with the transmission mechanism (20), and the second connecting rod (172) is used for being in transmission connection with the vacuum arc-extinguishing chamber (9);
the support wheel (34) is arranged on the first connecting rod (171).
8. The vacuum interrupter of claim 1, 2 or 3, wherein a sliding sealing ring (12) and a guide ring (13) are provided between the cylinder wall of the piston cylinder (4) and the outer circumferential surface of the piston (14), and the piston (14) is guide-and-seal fitted on the piston cylinder (4) through the sliding sealing ring (12) and the guide ring (13).
9. A low-operation vacuum circuit breaker according to claim 1, 2 or 3, wherein said piston-cylinder (4) is of a solid of revolution structure comprising:
the cylinder part (6), the cylinder part (6) is used for guiding, sealing and assembling the piston (14);
a flange portion (5) connected to the outer peripheral surface of the cylinder portion (6) and interposed between the end flange (3) of the main casing (2) and the end flange (3) of the low-pressure air chamber (11);
the flange part (5) is arranged at one axial end of the cylinder part (6), and the other end of the cylinder part (6) is inserted into the main shell (2).
10. The vacuum circuit breaker with low operating power according to claim 9, characterized in that an annular space is arranged between the cylinder part (6) and the inner wall of the main casing (2), a gas conduit (32) is hermetically connected to the flange part (5) at the area corresponding to the annular space, and the gas conduit (32) is communicated with the inner cavity of the main casing (2);
be equipped with on the locular wall of low pressure air chamber (11) and aerify interface (33), the one end that flange portion (5) were kept away from in gas conduit (32) is communicated with aerifing interface (33) for fill insulating gas to the inner chamber of main casing (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011388648.2A CN112614740A (en) | 2020-12-02 | 2020-12-02 | Low-operation power vacuum circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011388648.2A CN112614740A (en) | 2020-12-02 | 2020-12-02 | Low-operation power vacuum circuit breaker |
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| Publication Number | Publication Date |
|---|---|
| CN112614740A true CN112614740A (en) | 2021-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011388648.2A Pending CN112614740A (en) | 2020-12-02 | 2020-12-02 | Low-operation power vacuum circuit breaker |
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| Country | Link |
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| CN (1) | CN112614740A (en) |
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| JPH0479117A (en) * | 1990-07-19 | 1992-03-12 | Fuji Electric Co Ltd | Gas insulation switchgear |
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| CN206022215U (en) * | 2016-09-22 | 2017-03-15 | 黑龙江省电力科学研究院 | Vacuum pressure formula arc protection primary cut-out |
| CN108054051A (en) * | 2017-11-09 | 2018-05-18 | 河南平高通用电气有限公司 | A kind of breaker and its excess of stroke elastic device |
| DE102018205563A1 (en) * | 2018-04-12 | 2019-10-17 | Siemens Aktiengesellschaft | Electrical switching arrangement |
| CN111312554A (en) * | 2019-12-31 | 2020-06-19 | 平高集团有限公司 | Vacuum circuit breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0479117A (en) * | 1990-07-19 | 1992-03-12 | Fuji Electric Co Ltd | Gas insulation switchgear |
| CN101315849A (en) * | 2008-05-23 | 2008-12-03 | 西安交通大学 | Spring operating mechanism cooperated with 126kV vacuum circuit breaker separation-integration characteristic |
| CN103280375A (en) * | 2013-05-24 | 2013-09-04 | 沈阳华德海泰电器有限公司 | Oil damper for vacuum breaker operating mechanism |
| CN204230149U (en) * | 2014-12-03 | 2015-03-25 | 常熟开关制造有限公司(原常熟开关厂） | A kind of insulated tension pole assembly of vacuum circuit-breaker |
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Application publication date: 20210406 |