CN111696822B - Vacuum arc-extinguishing chamber and pole-mounted switch - Google Patents
Vacuum arc-extinguishing chamber and pole-mounted switch Download PDFInfo
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- CN111696822B CN111696822B CN202010589250.9A CN202010589250A CN111696822B CN 111696822 B CN111696822 B CN 111696822B CN 202010589250 A CN202010589250 A CN 202010589250A CN 111696822 B CN111696822 B CN 111696822B
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- 238000009529 body temperature measurement Methods 0.000 description 3
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0096—Radiation pyrometry, e.g. infrared or optical thermometry for measuring wires, electrical contacts or electronic systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/48—Thermography; Techniques using wholly visual means
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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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Abstract
The application provides a vacuum arc-extinguishing chamber and a pole-mounted switch, wherein the vacuum arc-extinguishing chamber comprises a shell, a first electric pole and a second electric pole, the first end of the first electric pole is provided with a first contact disc, the first end of the second electric pole is provided with a second contact disc, the first contact disc and the second contact disc work through contact or separation, and because the vacuum arc extinguish chamber is vacuum and does not conduct heat, therefore, if abnormal temperature rise is caused by poor contact of the contacts, the outside of the vacuum arc-extinguishing chamber cannot be sensed, the vacuum arc-extinguishing chamber provided by the embodiment of the application measures the abnormal temperature rise caused by poor contact between the first contact disc and the second contact disc by arranging the temperature measuring element in the shell, when the temperature measuring element detects that the temperature of the first contact plate or the second contact plate changes, an alarm signal is sent to the outside, and the operation stability of the vacuum circuit breaker is improved.
Description
Technical Field
The application relates to the field of vacuum switches of power systems, in particular to a vacuum arc extinguish chamber and a pole-mounted switch.
Background
The vacuum arc-extinguishing chamber is a core component of the vacuum switch, corresponding parts are sealed into a sealed vacuum chamber by adopting a vacuum brazing process, and arc can be quickly extinguished and current can be inhibited after a power supply is cut off by virtue of excellent vacuum insulation performance and arc extinguishing performance.
The vacuum arc-extinguishing chamber is completed by closing or separating a pair of opposite contacts in the vacuum arc-extinguishing chamber through an operating mechanism positioned outside the vacuum arc-extinguishing chamber. The shell is made of inorganic insulating materials such as ceramics, and is cylindrical, and two ends of the shell are sealed by a metal cover plate to form a closed container; the inside of the device is provided with a pair of moving and static contacts, the static contact is fixed on the static conducting rod, and the moving contact is fixed on the moving conducting rod.
The contact of the vacuum switch usually carries a large current, if the contact of the vacuum contact is not good, the increase of the contact resistance is firstly shown, and then the temperature rise of the contact is caused, and if the abnormity can be found in time, the planned load reduction is carried out, the maintenance of the vacuum switch is carried out, and the loss caused by circuit faults can be greatly reduced. However, since the conductive rod carries high voltage electricity, the contact temperature sensor is difficult to be arranged on the conductive rod for measurement, and the contact is positioned in the vacuum shielding cylinder, the vacuum does not conduct heat, so that the temperature rise of the contact cannot be transmitted to the shielding cylinder, and the temperature rise phenomenon of the contact is difficult to be found by measuring the temperature of the shielding cylinder from the outer side.
Disclosure of Invention
The application provides a vacuum arc extinguish chamber for solve exist among the prior art because the contact of vacuum contact is not good, the vacuum contact of initiation heaies up, leads to the technical problem that the circuit produced the trouble.
In view of this, this application first aspect provides a vacuum interrupter, vacuum interrupter includes casing, first pole and second pole, the first end of first pole is equipped with first contact dish, the first end of second pole is equipped with the second contact dish, the casing is all arranged in to first contact dish and second contact dish, but first contact dish and second contact dish relative movement contact or reverse movement part, be equipped with temperature element in the casing, temperature element is used for detecting the temperature variation of first contact dish or second contact dish.
Preferably, vacuum interrupter still includes first bellows and second bellows, first bellows is installed in the first end of casing to the first end that runs through the casing enters into the casing, the second bellows is installed at the second end of casing, and runs through the second end of casing and get into in the casing first pole and second pole are movable conducting rod, the mobilizable installation on first bellows of first pole, the mobilizable installation on the second bellows of second pole.
Preferably, all be equipped with a plurality of recess and a plurality of arch on the terminal surface of first time contact dish and second contact dish, recess on the first pole with protruding looks adaptation on the second pole, arch on the first pole with recess looks adaptation on the second pole.
Preferably, the protrusions of the first contact disc and the protrusions of the second contact disc are concentric circular protrusions, and the grooves of the first contact disc and the grooves of the second contact disc are formed between every two adjacent protrusions.
Preferably, the first contact disc is concavely curved in axial cross-sectional profile and the second contact disc is convexly curved in axial cross-sectional profile.
Preferably, the housing comprises an insulating shell and a shielding barrel, and the temperature measuring element is arranged at one end of the shielding barrel and faces the first contact disc and the second contact disc;
still be equipped with image acquisition device in the shielding section of thick bamboo, the inner wall of shielding section of thick bamboo is the mirror surface, image acquisition device establishes the end at the shielding section of thick bamboo, image acquisition device is used for gathering the image of first contact dish and second contact dish.
Preferably, vacuum interrupter still includes spring mounting bracket, spring mounting bracket installs on insulating casing, establish the first end of first pole and second pole the inside of a shielding section of thick bamboo, the second end of second pole passes insulating casing and is located outside the spring mounting bracket, the second of second pole is served and is equipped with the boss, be equipped with the spring between boss and the spring mounting bracket, the spring housing is established on the second pole.
Preferably, the insulating casing is provided with a limiting block, the spring mounting frame is provided with a limiting protrusion, the limiting block is matched with the limiting protrusion, and the spring mounting frame is installed on the insulating casing through the limiting block and the limiting protrusion.
Preferably, the vacuum interrupter further includes a first guide sleeve and a second guide sleeve, the first guide sleeve is connected to the first end of the insulating housing, the first guide rod is movably mounted on the first guide sleeve, the second guide sleeve is connected to the second end of the insulating housing, and the second guide rod is movably mounted on the second guide sleeve.
The embodiment of the application also provides a column switch, including three sets like foretell vacuum interrupter, every set of vacuum interrupter corresponds a pair of insulating pull rod, a pair of insulating pull rod is used for handling vacuum interrupter's first pole and second pole, the one end of a pair of insulating pull rod is passed through the round pin hub and is fixed on intermeshing's fluted disc.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides a vacuum arc extinguish chamber, vacuum arc extinguish chamber includes casing, first pole and second pole, the first end of first pole is equipped with first contact dish, the first end of second pole is equipped with second contact dish, first contact dish and second contact dish work through contact or separation, wherein, because the vacuum in the vacuum arc extinguish chamber, do not conduct heat, so if contact failure between first contact dish and the second contact dish leads to unusual temperature rise, the vacuum arc extinguish chamber outside is that the perception is not available, and first pole and second pole itself have very high voltage, the temperature measurement component of contact also is difficult to set up on the conducting rod, the vacuum arc extinguish chamber that this application embodiment provided measures the condition that contact failure leads to unusual intensification between first contact dish and the second contact dish through setting up temperature measurement component in the casing, when temperature measurement component detected the temperature change of first contact dish or second contact dish, and an alarm signal is sent to the outside, so that the operation stability of the vacuum circuit breaker is improved. The technical problem that a circuit breaks down due to the fact that the vacuum contact is poor in contact and the temperature of the vacuum contact is raised in the prior art is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural view of a vacuum interrupter of embodiment 1;
fig. 2 is another schematic structural view of a vacuum interrupter of embodiment 1;
fig. 3 is a schematic three-dimensional structure of a second contact pad in embodiment 1;
fig. 4 is a top view of a second contact pad in embodiment 1;
FIG. 5 is a cross-sectional view taken along plane A-A of FIG. 4;
fig. 6 is a schematic view of the first and second contact trays in a separated state;
fig. 7 is a schematic view of a contact state of the first contact pad and the second contact pad;
fig. 8 is a schematic view of approximate calculation of the surface area of the first contact pad or the second contact pad in embodiment 1;
fig. 9 is a schematic structural view of a first contact pad and a second contact pad in embodiment 2;
fig. 10 is a schematic view of a pole top switch of embodiment 3.
In the drawings, the parts names represented by the respective reference numerals are listed as follows:
1. an insulating housing; 1-1, a limiting block; 2. a shielding cylinder; 2-1, an infrared temperature sensor; 2-2, an image acquisition device; 3-1, a first pole; 3-1-1, a first contact pad; 3-2, a second electric pole; 3-2-1, a second contact pad; 3-2-2, boss; 4-1, a first corrugated pipe; 4-2, a second corrugated pipe; 5-1, a first guide sleeve; 5-2, a second guide sleeve; 6. a spring; 7. a spring mount; 7-1, limiting bulges; A. a vacuum arc-extinguishing chamber; B. the operating pull rod is insulated.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For ease of understanding, please refer to fig. 1-8, which provide an embodiment 1 of a vacuum interrupter.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a vacuum interrupter of embodiment 1; fig. 2 is another schematic diagram of a vacuum arc extinguishing structure according to embodiment 1.
The embodiment 1 of the application provides a vacuum arc extinguish chamber, which comprises an insulating shell 1, a shielding cylinder 2, an infrared temperature sensor 2-1, an image acquisition device 2-2 and a spring mounting rack 7; the spring mounting rack 7 is installed on the insulating shell 1, the end of the first electric pole 3-1 is provided with a first contact disc 3-1-1, the end of the second electric pole 3-2 is provided with a second contact disc 3-2-1, the first contact disc 3-1-1 and the second contact disc 3-2-1 are both arranged in the shielding cylinder 2, the end part of the inner side of the shielding cylinder is provided with an infrared temperature sensor 2-1, the infrared temperature sensor 2-1 faces the direction of the first contact disc 3-1-1 and the direction of the second contact disc 3-2-1, the first ends of the first electric pole 3-1 and the second electric pole 3-2 can be in relative movement contact or in reverse movement separation, namely, the first contact disc 3-1-1 and the second contact disc 3-2-1 can be in relative movement contact or in reverse movement separation, the second ends of the first electric pole 3-1 and the second electric pole 3-2 are respectively connected with external equipment, when the first contact disc 3-1-1 is contacted with the second contact disc 3-2-1, current can flow through the first contact disc 3-1-1 and the second contact disc 3-2-1, and when a fault occurs and tripping is needed, the first contact disc 3-1-1 and the second contact disc 3-2-1 relatively move in the reverse direction, so that the first contact disc 3-1-1 is separated from the second contact disc 3-2-1; the infrared temperature sensor is used for detecting the temperature change of the first contact disc 3-1-1 or the second contact disc. The insulating housing 1 and the shielding cylinder 2 may be an integral housing. The infrared temperature sensor 2-1 can also be replaced by other temperature measuring elements capable of measuring temperature. The infrared temperature sensor may not be disposed at the end of the inner side of the shielding cylinder 2, or may be disposed at another place in the shielding cylinder 2, and the purpose of disposing the infrared temperature sensor 2-1 at the end of the inner side of the shielding cylinder is to prevent the infrared temperature sensor 2-1 from being damaged by an arc generated when the first contact plate 3-1-1 and the second contact plate 3-2-1 are contacted or separated.
The application provides a vacuum arc extinguish chamber, because the arc extinguish chamber is vacuum and does not conduct heat, if the first contact plate 3-1-1 or the second contact plate 3-2-1 has poor contact to cause abnormal temperature rise, the outer part of the vacuum arc extinguish chamber cannot be sensed, and the conducting rod has high voltage, the contact temperature measuring element is difficult to be arranged on the conducting rod, the vacuum arc extinguish chamber provided by the embodiment of the application is provided with an infrared temperature sensor 2-1 in a shielding cylinder 2 to measure the condition that the first contact plate 3-1-1 or the second contact plate 3-2-1 has poor contact to cause abnormal temperature rise, when the infrared temperature sensor 2-1 detects the temperature change of the first contact plate 3-1-1 or the second contact plate 3-2-1, and an alarm signal is sent to the outside, so that the operation stability of the vacuum circuit breaker is improved. The technical problem that a circuit breaks down due to the fact that the vacuum contact is poor in contact and the temperature of the vacuum contact rises due to the fact that the vacuum contact is poor in the prior art is solved.
Referring to fig. 2-6, a plurality of concentric grooves and projections are formed in the first contact disc 3-1-1 and the second contact disc 3-2-1, cross-sectional profiles of the grooves and projections are circular arc-shaped, the grooves and projections are alternately arranged and smoothly transited, the grooves on the first electric pole 3-1 are matched with the projections on the second electric pole 3-2, the projections on the first electric pole 3-1 are matched with the grooves on the second electric pole, and the first electric pole 3-1 and the second electric pole 3-2 are in contact with each other through the first contact disc 3-1-1 and the second contact disc 3-2-1.
The first contact disc 3-1-1 and the second contact disc 3-2-1 are concentric circular-ring-shaped bulges, grooves of the first contact disc 3-1-1 and the second contact disc 3-2-1 are formed between every two adjacent bulges, the grooves of the first contact disc 3-1-1 and the second contact disc 3-2-1 are in a concave arc shape along the axial section contour, and the bulges of the first contact disc 3-1-1 and the second contact disc 3-2-1 are in a convex arc shape along the axial section contour.
The contact of the vacuum arc-extinguishing chamber usually carries a large current, theoretically, the larger the contact area of the contact is, the smaller the contact resistance on the contact surface is, which is more beneficial to reducing the contact temperature and further improving the service life of the contact.
In the embodiment, the first contact pad 3-1-1 is contacted with the second contact pad 3-2-1 through the matched groove and the matched bulge, so that the contact area is increased, the contact resistance is favorably reduced, and the temperature of the contact part is further reduced; secondly, when the first contact disc 3-1-1 and the second contact disc 3-2-1 are contacted with the protrusions through the matched grooves and the matched protrusions, the contact area is increased, the impact force per unit contact area is reduced for the same closing impact force, the service life is prolonged, and the noise is reduced. And thirdly, the arrangement of the mutually matched grooves and protrusions ensures that the first contact disc 3-1-1 and the second contact disc 3-2-1 have an automatic guiding function after being contacted, the concentricity of the first contact disc 3-1-1 and the second contact disc 3-2-1 is ensured, in addition, the mutually matched grooves and protrusions also increase the contact area of the first contact disc 3-1-1 and the second contact disc 3-2-1, and the capacity of the contact for bearing large current is improved.
Wherein, as shown in fig. 6, 2 circles of grooves and 2 circles of protrusions are provided, the number of the grooves and the protrusions cannot be set too much, the pitch of the adjacent grooves and the adjacent protrusions is ensured to be larger than the maximum eccentric amount of the first electric pole 3-1 and the second electric pole 3-2, and the occurrence of the protrusion to the protrusion when the electric poles are contacted is avoided.
The inner wall of the shielding cylinder 2 is a mirror surface, and the shielding cylinder is further provided with an image acquisition device 2-2, the image acquisition device 2-2 is arranged at the end in the shielding cylinder 2 and faces towards the inner side surface of the shielding cylinder 2, and the image acquisition device is used for acquiring images of the first contact disc 3-1-1 and the second contact disc 3-2-1. That is, the image of the inner side surface of the shielding cylinder 2 and the image of the first contact disk 3-1-1 and the second contact disk 3-2-1 reflected by the inner side of the shielding cylinder 2 can be collected.
With the repeated operation of the vacuum arc-extinguishing chamber, electric arcs are continuously generated between the electrodes, even if the current electrode contact is specially processed, a plurality of traces of the electric arcs are still formed on the electrode contact, and if the condition that the traces of the electric arcs burnt on the first contact disc 3-1-1 and the second contact disc 3-2-1 can be observed, the working state of the current vacuum arc-extinguishing chamber can be effectively judged, and the working life of the vacuum arc-extinguishing chamber can be judged in advance.
Because the space in the shielding cylinder is limited, if the image acquisition device 2-2 is arranged near the first contact disc 3-1-1 or the second contact disc 3-2-1, the capability of cutting off the power supply between the first contact disc 3-1-1 and the second contact disc 3-2-1 is affected, the image acquisition device 2-2 itself is easily destroyed by the high-energy arc, and the image acquisition device 2-2 is arranged at the end in the shielding cylinder far away from the position of the contact discs, the inner wall of the shielding cylinder is set to be a mirror surface, so that the condition of the first contact disc 3-1-1 and the second contact disc 3-2-1 can be reflected to the image acquisition device 2-2 through the side wall of the shielding cylinder, and thus under the state that the first contact disc 3-1-1 and the second contact disc 3-2-1 are separated, the image information of the first contact disc 3-1-1 and the second contact disc 3-2-1 is collected, and a basis is provided for judging the working state of the vacuum arc-extinguishing chamber. Of course, since the shielding cylinder is in a fully closed state, the image capturing device 2-2 itself needs to be provided with a light source in order to capture the image information of the first contact pad 3-1-1 and the second contact pad 3-2-1. In addition, along with the action of the vacuum arc extinguish chamber, the electric arc continuously burns the first contact disc 3-1-1 and the second contact disc 3-2-1, a part of metal materials on the first contact disc 3-1-1 and the second contact disc 3-2-1 are evaporated into metal steam and then adsorbed on the inner wall of the shielding cylinder, which can affect the mirror effect of the inner wall of the shielding cylinder, because the image acquisition device 2-2 is used for acquiring towards the inner wall of the shielding cylinder, when the inner wall of the shielding cylinder is polluted by the metal steam, images of the first contact disc 3-1-1 and the second contact disc 3-2-1 are difficult to acquire, however, the pollution degree of the inner wall of the shielding cylinder also reflects the burning condition of the first contact disc 3-1-1 and the second contact disc 3-2-1 in a phase-changing way, the collected images can still be used to provide data support for determining the working state in the vacuum interrupter chamber. The image acquisition device 2-2 may be a camera.
The first electric pole 3-1 and the second electric pole 3-2 are both movable conducting rods, the vacuum arc extinguish chamber further comprises a first corrugated pipe 4-1 and a second corrugated pipe 4-2, the first corrugated pipe 4-1 is installed at the first end of the shell and penetrates through the first end of the shell to enter the shell, namely the first corrugated pipe 4-1 is installed at the first ends of the insulating shell 1 and the shielding cylinder 2 and penetrates through the first ends of the insulating shell 1 and the shielding cylinder 2 to enter the shielding cylinder 2; the second corrugated pipe 4-2 is installed at the second end of the shell and penetrates through the second end of the shell to enter the shell, namely, the second corrugated pipe 4-2 is installed at the second end of the insulating shell 1 and the second end of the shielding cylinder 2 and penetrates through the second end of the insulating shell 1 and the second end of the shielding cylinder 2 to enter the shielding cylinder 2; first pole and second pole are the power transmission pole, the mobilizable installation of first pole is on first bellows 4-1, the mobilizable installation of second pole is on second bellows 4-2.
The vacuum arc-extinguishing chamber is characterized in that the first electric pole 3-1 and the second electric pole 3-2 of the vacuum arc-extinguishing chamber are movable conducting rods, in the process of executing on-off, the first electric pole 3-1 and the second electric pole 3-2 move oppositely with equivalent kinetic energy in two directions at the same time, on-off is realized, and as the first electric pole 3-1 and the second electric pole 3-2 collide or separate with equivalent kinetic energy in completely opposite directions, impact forces in two directions are mutually offset for the whole vacuum arc-extinguishing chamber, so that the vibration of the whole vacuum arc-extinguishing chamber is greatly reduced.
The vacuum arc extinguish chamber further comprises a first guide sleeve 5-1 and a second guide sleeve 5-2, the first guide sleeve 5-1 is connected with the first end of the insulating shell 1, the first guide rod 3-1 is movably arranged on the first guide sleeve 5-1, the second guide sleeve 5-2 is connected with the second end of the insulating shell 1, and the second guide rod 3-2 is movably arranged on the second guide sleeve 5-2.
Because the sprain is a large factor influencing the service life of the corrugated pipe, the first guide rod 3-1 moves on the first guide sleeve 5-1 and the second guide rod 3-2 moves on the second guide sleeve 5-2, so that the first guide rod 3-1 or the second guide rod 3-2 can be effectively prevented from twisting in the moving process, and the service life of the first corrugated pipe 4-1 or the second corrugated pipe 4-2 is prevented from being influenced.
The second end of second pole 3-2 passes insulating casing 1 and is located outside spring mounting bracket 7, second pole 3-2 is located and is equipped with boss 3-2-2 on the position that insulating casing 1 is located between spring mounting bracket 7, be equipped with spring 6 between boss 3-2-2 and the spring mounting bracket 7, spring 6 cover is established on second pole 3-2. The spring 6 is arranged in the insulating spring mounting frame 7, one end of the spring 6 abuts against the boss 3-2-2, the other end of the spring 6 abuts against the shell of the spring mounting frame chamber 7, the spring mounting frame 7 is provided with a limiting protrusion 7-1, the position of the insulating shell 1, which is matched with the spring mounting frame 7, is provided with a limiting block 1-1, the limiting block 1-1 is matched with the limiting protrusion 7-1, and the spring mounting frame 7 is arranged on the insulating shell through the limiting block 1-1 and the limiting protrusion 7-1.
When the switch-on operation is executed, the spring can prolong the absorption time of impact at the moment that the first electric pole 3-1 and the second electric pole 3-2 collide with each other, the impact force instantaneously borne by the first contact disc 3-1-1 and the second contact disc 3-2-1 is reduced, the vibration of the vacuum arc-extinguishing chamber caused by the impact is reduced, meanwhile, the absorption time of the impact is prolonged, the stable static pressure between the first contact disc 3-1-1 and the second contact disc 3-2-1 can be properly increased, and the contact quality of the first contact disc 3-1-1 and the second contact disc 3-2-1 is improved.
As shown in fig. 7, the height difference between the adjacent grooves or projections on the first contact pad 3-1-1 and the second contact pad 3-2-1 is 0.5 mm to 5 mm. In the case where the first contact pad 3-1-1 and the second contact pad 3-2-1 are both circular discs having a diameter D of 100mm and the height difference h between adjacent projections and grooves is 5mm, the areas of the first contact pad 3-1-1 and the second contact pad of the prior art are both pi r2 of 7850mm2The protrusions and the grooves are approximately regarded as triangles for calculation, namely, the arcs ab, bc, cd and de are approximately regarded as straight line segments ab, bc, cd and de, and the straight line segments bc, cd and de are translated and/or mirrored to obtain equivalent straight line segments ae', so that after the protrusions and the grooves are arranged on the first contact disc 3-1-1 and the second contact disc 3-2-1, the surface areas of the first contact disc 3-1-1 and the second contact disc 3-2-1 are approximately equal to the side area of a cone with the height of 4h and the diameter of the bottom of 100mm, and the specific area is calculated to be 8454mm2The contact area is increased by 7.8% compared to the planar contact, and the area increase rate is higher if the ring grooves are increased.
The electric poles with different capacities and scales are selected to be suitable for concave-convex difference, and besides the effect, the electric pole has an automatic guiding effect in contact, so that the concentricity of the first electric pole 3-1 and the second electric pole 3-2 can be effectively ensured.
Example 2:
as shown in fig. 9, fig. 9 is a schematic structural view of a first contact pad and a second contact pad in embodiment 2;
the first contact disc 3-1-1 is in a concave arc shape along the axial section outline, and the second contact disc 3-2-1 is in a convex arc shape along the axial section outline. This structure makes it possible to further increase the contact area of the first contact pad 3-1-1 and the second contact pad 3-2-1, compared to embodiment 1.
Example 3
Referring to fig. 10, an embodiment 3 of the present application provides a pole-mounted switch, which includes three sets of vacuum arc-extinguishing chambers, each set of vacuum arc-extinguishing chamber corresponds to a pair of insulating pull rods, namely a first insulating pull rod B-1 and a second insulating pull rod B-2, wherein the first insulating pull rod B-1 is used for operating a first electric pole 3-1 of a vacuum arc-extinguishing chamber, the second insulating pull rod B-2 is used for operating a second electric pole 3-2 of the vacuum arc-extinguishing chamber, the other end of the first insulating pull rod B-1 is fixed on a first fluted disc C-1 through a pin shaft, the other end of the second insulating pull rod B-2 is fixed on a second fluted disc C-2 through a pin shaft, and the first fluted disc C-1 and the second fluted disc C-2 are meshed with each other, so that the action consistency of the first insulating pull rod B-1 and the second insulating pull rod B-2 is ensured.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (9)
1. A pole switch is characterized by comprising three sets of vacuum arc-extinguishing chambers and insulating pull rods, wherein each set of vacuum arc-extinguishing chamber corresponds to one pair of insulating pull rods, the pair of insulating pull rods are used for operating a first electric pole and a second electric pole of each vacuum arc-extinguishing chamber, and one ends of the pair of insulating pull rods are fixed on mutually meshed fluted discs through pin shafts;
vacuum interrupter includes casing, first pole and second pole, the first end of first pole is equipped with first contact dish, the first end of second pole is equipped with the second contact dish, first contact dish and second contact dish are all arranged in the casing, but first contact dish and second contact dish relative movement contact or reverse movement separation, be equipped with temperature element in the casing, temperature element is used for detecting the temperature variation of first contact dish or second contact dish.
2. The pole switch of claim 1, wherein said vacuum interrupter further comprises a first bellows and a second bellows, said first bellows is mounted at a first end of said housing and extends through said first end of said housing into said housing, said second bellows is mounted at a second end of said housing and extends through said second end of said housing into said housing, said first pole and said second pole are both moving conductive poles, said first pole is movably mounted on said first bellows, and said second pole is movably mounted on said second bellows.
3. The pole switch of claim 2, wherein the end surfaces of the first contact disc and the second contact disc are provided with a plurality of grooves and a plurality of protrusions, the grooves on the first pole are adapted to the protrusions on the second pole, and the protrusions on the first pole are adapted to the grooves on the second pole.
4. The column switch of claim 3, wherein the protrusions of the first contact disc and the protrusions of the second contact disc are concentric circular protrusions, and the grooves of the first contact disc and the grooves of the second contact disc are formed between two adjacent protrusions.
5. A pole switch according to claim 4, characterized in that the first contact disc is concavely curved in axial cross-sectional profile and the second contact disc is convexly curved in axial cross-sectional profile.
6. A pole switch according to claim 5,
the shell comprises an insulating shell and a shielding barrel, and the temperature measuring element is arranged at the end part of the shielding barrel and faces the first contact disc and the second contact disc;
the temperature measuring element comprises an infrared temperature sensor;
still be equipped with image acquisition device in the shielding section of thick bamboo, the inner wall of shielding section of thick bamboo is the mirror surface, image acquisition device establishes the tip at the shielding section of thick bamboo, image acquisition device is used for gathering the image of first contact dish and second contact dish.
7. The pole switch of claim 6, wherein the vacuum interrupter further comprises a spring mount, the spring mount is mounted on the insulating housing, the first end of the first pole and the first end of the second pole are arranged inside the shielding cylinder, the second end of the second pole passes through the insulating housing and is located outside the spring mount, a boss is arranged at the second end of the second pole, a spring is arranged between the boss and the spring mount, and the spring is sleeved on the second pole.
8. The column switch according to claim 7, wherein the insulating housing is provided with a limiting block, the spring mounting frame is provided with a limiting protrusion, the limiting block is matched with the limiting protrusion, and the spring mounting frame is mounted on the insulating housing through the limiting block and the limiting protrusion.
9. The pole switch of claim 8, wherein the vacuum interrupter further comprises a first guide bushing and a second guide bushing, the first guide bushing is connected to the first end of the insulating housing, the first pole is movably mounted on the first guide bushing, the second guide bushing is connected to the second end of the insulating housing, and the second pole is movably mounted on the second guide bushing.
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| CN202010589250.9A CN111696822B (en) | 2020-06-24 | 2020-06-24 | Vacuum arc-extinguishing chamber and pole-mounted switch |
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| CN202010589250.9A CN111696822B (en) | 2020-06-24 | 2020-06-24 | Vacuum arc-extinguishing chamber and pole-mounted switch |
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| CN111696822A CN111696822A (en) | 2020-09-22 |
| CN111696822B true CN111696822B (en) | 2022-06-14 |
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