CN115295356A - Arc extinguish chamber of circuit breaker - Google Patents

Arc extinguish chamber of circuit breaker Download PDF

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Publication number
CN115295356A
CN115295356A CN202210786628.3A CN202210786628A CN115295356A CN 115295356 A CN115295356 A CN 115295356A CN 202210786628 A CN202210786628 A CN 202210786628A CN 115295356 A CN115295356 A CN 115295356A
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CN
China
Prior art keywords
air guide
chamber
gas
arc
air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210786628.3A
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Chinese (zh)
Inventor
钟建英
王之军
王楠
张豪
刘亚培
李淼鑫
姚永其
张利欣
郭学凤
左琪
杨祥海
杜迎乾
郭明钦
张楠楠
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Pinggao Group Co Ltd
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Pinggao Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pinggao Group Co Ltd filed Critical Pinggao Group Co Ltd
Priority to CN202210786628.3A priority Critical patent/CN115295356A/en
Publication of CN115295356A publication Critical patent/CN115295356A/en
Pending legal-status Critical Current

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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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/80—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve
    • H01H33/82—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas
    • 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/72—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid having stationary parts for directing the flow of arc-extinguishing fluid, e.g. arc-extinguishing chamber
    • H01H33/74—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid having stationary parts for directing the flow of arc-extinguishing fluid, e.g. arc-extinguishing chamber wherein the break is in gas

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  • Circuit Breakers (AREA)

Abstract

The invention relates to an arc extinguish chamber of a circuit breaker, which comprises an air guide cone and a static support which are coaxially arranged relative to a central axis, wherein the static support is of a cylindrical structure, an air compression chamber is formed in an inner cavity of the static support, an air guide surface facing the air compression chamber is arranged on the air guide cone, the air guide surface is a rotary surface taking the central axis as a rotary center, the air guide surface is used for guiding hot air flow guided onto the air guide cone, the air guide cone and the static support are arranged at intervals to form a flow through port, the air guide cone is provided with a conical part protruding towards the static support, the outer surface of the tip of the conical part is a spherical crown, a conical surface is arranged on the periphery of the tip of the conical part and is tangent to the spherical crown, a plane is arranged on the periphery of the conical part on the air guide cone, an arc transition surface is arranged between the plane and the conical surface, and the spherical crown, the conical surface, the arc transition surface and the plane jointly form the air guide surface, so that the integral temperature of the gas in the arc extinguish chamber can be obviously reduced, the temperature is quickly reduced, and the heat dissipation capability is effectively improved.

Description

Arc extinguish chamber of circuit breaker
Technical Field
The invention relates to the technical field of circuit breakers, in particular to an arc extinguish chamber of a circuit breaker.
Background
In the case of a short circuit at a certain location in the power grid, the circuit breaker is the last link in the protection chain of the power system and is also the only means for protecting the power grid. Therefore, the circuit breaker must meet very high requirements in terms of operational reliability. The high-voltage circuit breaker is mainly used for closing, bearing and breaking loop current and is vital to safe operation of a circuit. In power plants and substations, high-voltage circuit breakers are used for both control and protection, play an important role in the safe and stable operation of power systems, and are indispensable elements. With the rapid development of the electric power industry in China, the power transmission and transformation grade is continuously improved, the running performance and quality requirements of electric appliance products are higher and higher, and high-voltage SF 6 The circuit breaker is used as a leading product of a high-voltage switch, plays an important role in control and protection in high-voltage, ultrahigh-voltage and extra-high-voltage power transmission systems, and ensures the circuit breaker in a power systemThe power equipment is not damaged, and safe, reliable and stable operation of power utilization is further realized.
High pressure SF 6 The breaker is in the on-off process of short-circuit current, and thermal breakdown phenomenon takes place occasionally, wherein the main reason that causes dielectric insulation performance to reduce is high temperature in the arc extinguishing chamber wherein, in order to avoid high temperature in the arc extinguishing chamber, need lead to the electric arc SF between the fracture 6 The hot gas with reduced gas density is discharged rapidly, and the cooling of the gas at the position of the arc where the arc is cut off is continuously enhanced. In order to discharge hot air, a corresponding air flow channel is arranged in the arc extinguish chamber so that high-temperature and high-pressure air at the fracture can be discharged along the air flow channel, and in order to ensure smooth air circulation, an air guide cone is arranged in the air flow channel and guides the air flow and changes the direction of the air flow. The arc extinguish chamber comprises an air guide cone 1, a plenum chamber 3, a static support 4, an air blocking cover 2, a static arc contact 6 and a nozzle 7, wherein the arc extinguish chamber comprises an arc extinguish chamber with a central axis, the static arc contact is positioned on the central axis, the static arc contact is separated from and combined with a corresponding moving arc contact in the nozzle, the static support is a cylinder with an inner cavity, the static support is used for installing the static arc contact, the axis of the static support is superposed with the central axis, the plenum chamber is formed in the inner cavity of the static support, the air guide cone is arranged on one side of the static support far away from the nozzle, the air guide cone is a revolving body with the central axis as a revolving center, one side of the air guide cone facing the plenum chamber is provided with an annular groove, the axis and the central axis of annular groove coincide, the groove wall face of annular groove forms the face of leading gas, the groove wall face of annular groove is smooth curved surface and annular groove has the outside groove wall face that encircles the central axis, the notch of annular groove is outer along relative and interval arrangement in order to form the overflow mouth with the terminal surface of quiet support, the one end that leads the quiet support of back of the gas awl is fixed with the cover that keeps off the gas, it establishes in leading gas awl and quiet support periphery to keep off the gas cover, be formed with the annular space between the outer peripheral face of cover and quiet support of keeping off the gas, the one end of keeping away from the gas awl of quiet support is equipped with the shield cover, the annular groove of spout is enclosed into with the outer peripheral face of quiet support to the shield cover, it stretches into in the annular to keep off the gas cover. When the static arc contact and the moving arc contact are separated, high-temperature and high-pressure gas generated at the fracture enters the pressure chamber, is guided by the gas guide surface of the gas guide cone, and enters the gas blocking cover through the overflowing portAnd the gas flows into a ring groove between the shielding cover and the static support in a gap between the gas blocking cover and the static support, and is discharged from the gap between the gas blocking cover and the shielding cover.
The shape design of the air guide cone is critical because the shape of the air guide cone affects the air circulation, which in turn affects the heat dissipation capacity. The gas guide cone in the existing arc extinguish chamber can guide gas to circulate to a certain extent, but in the practical application process, the capability of enhancing the smoothness of the gas flow is still insufficient, the requirement for high heat dissipation speed of a gas flow channel cannot be met, and particularly, the requirement for higher and higher heat dissipation speed of an electric appliance product is generated along with the development of the industry at present, so that the heat dissipation capability of the existing arc extinguish chamber cannot meet the requirement.
Disclosure of Invention
The invention aims to provide an arc extinguish chamber of a circuit breaker, which aims to solve the problem of low heat dissipation capability of the arc extinguish chamber of the existing circuit breaker.
The technical scheme of the arc extinguish chamber of the circuit breaker is as follows:
the utility model provides an explosion chamber of circuit breaker, include air guide awl and quiet support for the coaxial setting of central axis, quiet support is barrel structure, the inner chamber of quiet support forms the plenum chamber, be equipped with the air guide face towards the plenum chamber on the air guide awl, the air guide face is for using the central axis as centre of rotation's surface of revolution, the air guide face is used for leading the hot gas flow on the air guide awl, air guide awl and quiet support interval set up in order to form the mouth that overflows between air guide awl and quiet support, the air guide awl has the convex toper portion of orientation quiet support, the surface at the most advanced of toper portion is the spherical crown, be equipped with the conical surface on the toper portion around most advanced, the conical surface with the spherical crown is tangent, is equipped with the plane on the air guide awl around the toper portion, is equipped with the circular arc transition face between plane and the conical surface, spherical crown, the conical surface, circular arc transition face, plane form the air guide face jointly.
Has the beneficial effects that: set up the toper portion through the protrusion on the plane, and set the most advanced surface of toper portion to the spherical crown, thereby with the spherical crown, the conical surface, the circular arc transition face, the plane carries out smooth cooperation, form the air guide face jointly, the air guide face of shape like this, can make the air current passageway in the arc extinguish chamber more smooth and easy, through the simulation analysis proof, adopt the air guide awl that has this kind of shape air guide face, compare in current air guide awl, can make the gaseous bulk temperature in the arc extinguish chamber have obvious decline, the temperature reduces soon, the heat-sinking capability has effectively been promoted.
Further, the tapered portion extends into the plenum.
Has the beneficial effects that: the conical part extends into the air compression chamber, which is beneficial to guiding hot air flow.
Furthermore, the static support is provided with a rear end face facing the air guide cone, the direction perpendicular to the central axis is taken as the radial direction, and the middle part of the conical surface of the conical part in the extending direction of the central axis corresponds to the position of the rear end face of the static support in the radial direction.
Has the beneficial effects that: the end part of the static support corresponds to the middle part of the conical surface in the radial direction, so that hot air can rapidly pass through the static support.
Furthermore, the plane is located at the rear side of the static support and is opposite to the rear end face of the static support in the front-back direction, and the annular gap between the plane and the rear end face of the static support forms the flow passing port.
Has the advantages that: therefore, a radial outward overflowing opening is formed between the air guide cone and the static support so as to allow air flow to smoothly pass through.
The annular flow passage is communicated with the flow passing port, one end of the gas blocking cover close to the gas guide cone is fixed on the gas guide cone, and the plane is connected with the inner peripheral surface of the gas blocking cover.
Has the beneficial effects that: the plane is connected with the inner circumferential surface of the gas shield, which is beneficial to smooth the airflow channel and improve the gas flowing speed.
Furthermore, the end face of one end of the air blocking cover close to the air guide cone is connected with the plane.
Has the beneficial effects that: the gas blocking cover and the gas guide cone are convenient to seal and fix, and the gas flow is favorably prevented from being influenced by the gap generated between the inner peripheral surface of the gas blocking cover and the gas guide cone.
Furthermore, a pressure air chamber flow passage through which the heat supply air flow passes is arranged in the pressure air chamber, two communication ports are arranged between the pressure air chamber flow passage and the annular flow passage, and the two communication ports are arranged at intervals along the extension direction of the central axis; the middle part of the static support in the extension direction of the central axis is provided with an air vent for passing the heat supply air flow, and the air vent is correspondingly communicated with the middle part of the annular flow passage; the vent and the overflowing port form two communicating ports.
Has the advantages that: the ventilation opening is formed in the middle of the static support, so that the ventilation opening in the middle and the two communication holes of the overflowing opening at the end part are formed between the pressure air chamber flow channel and the annular flow channel, part of hot air can enter the annular flow channel from the ventilation opening in the middle, the other part of hot air flows through the tail end air guide cone and enters the annular flow channel from the tail end overflowing opening, the ventilation opening and the overflowing opening can be utilized to be in gradient fit on a gas flow path, the burden of the air guide cone is reduced, the durability is improved, and the quick exhausting of the hot air is facilitated.
Drawings
Fig. 1 is a schematic structural view of a stationary end portion of an arc extinguishing chamber in the prior art;
fig. 2 is a schematic view of an installation relationship between an air guide cone of an arc extinguish chamber of a circuit breaker and a static support, an air blocking cover and a shielding cover in embodiment 1 of the invention;
fig. 3 is a schematic view of the gas flow in the arc extinguishing chamber of the circuit breaker according to embodiment 1 of the present invention;
fig. 4 is a temperature contour distribution diagram of an arc extinguishing chamber of a circuit breaker in the embodiment 1 of the present invention at the time of 12ms in an arc burning stage;
fig. 5 is a temperature contour distribution diagram of an arc extinguishing chamber of a circuit breaker in the embodiment 1 of the present invention at the time of an arc burning stage of 14 ms;
fig. 6 is a temperature contour distribution diagram of an arc extinguishing chamber of a circuit breaker in the embodiment 1 of the present invention at the time of 15ms in an arc burning stage;
fig. 7 is a temperature contour distribution diagram of an arc extinguishing chamber of a circuit breaker in the embodiment 1 of the present invention at a time of 16ms in an arc burning stage;
fig. 8 is a temperature contour distribution diagram of an arc extinguishing chamber of a circuit breaker in the embodiment 1 of the present invention at a time of 17ms in an arc burning stage;
FIG. 9 is a temperature contour plot of the arc chute of the prior art of FIG. 1 at 12ms during the arcing phase;
fig. 10 is a temperature contour plot of the prior art arc chute of fig. 1 at a time 14ms during the arcing phase;
fig. 11 is a temperature contour plot of the prior art arc chute of fig. 1 at the 15ms instant of the arcing phase;
fig. 12 is a temperature contour plot of the arc chute of the prior art of fig. 1 at 16ms during the arcing phase;
fig. 13 is a temperature contour plot of the prior art arc chute of fig. 1 at a time of 17ms during the arcing phase.
In the figure: 1. a gas guiding cone; 10. a gas-guiding surface; 11. a spherical cap; 12. a conical surface; 13. a circular arc transition surface; 14. a plane; 2. a gas shield; 3. a gas compression chamber; 4. a static support; 5. a shield case; 6. a stationary arc contact; 7. a spout; 8. and a flow port.
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 embodiments of the invention, are given by way of illustration only, not by way of limitation, i.e., the embodiments described are intended as a selection of the best mode contemplated for carrying out the invention, not as a full mode. 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 used herein in accordance with the embodiments of the present invention, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, terms such as "comprises," "comprising," or any other variation thereof, which may be present, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the possible occurrences of the phrase "comprising a" \8230; "8230;" etc. does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises such 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.
Embodiment 1 of arc extinguishing chamber of circuit breaker of the invention:
as shown in fig. 2 and 3, only a partial structure of the arc extinguish chamber of the circuit breaker is shown, and the arc extinguish chamber of the circuit breaker comprises a static support 4 and a guide seatThe arc extinguishing chamber is provided with a central axis, the static support 4, the air guide cone 1, the air blocking cover 2 and the shielding cover 5 are coaxially arranged relative to the central axis, a fracture (not shown in the figure) of the arc extinguishing chamber is positioned on the front side of the static support 4, the air guide cone 1 is arranged on the rear side of the static support 4, the air blocking cover 2 covers the periphery of the static support 4, the shielding cover 5 is arranged at the front end of the static support 4, and when the fracture is subjected to arc burning, the generated high-temperature high-pressure SF 6 The gas flows in the direction of the arrow in fig. 3, the hot gas flow enters the static support 4, flows to the air guide cone 1, is guided by the air guide cone 1, enters the gap between the air blocking cover 2 and the static support 4, and is discharged from the gap between the shielding cover 5 and the air blocking cover 2.
The static support 4 is of a cylinder structure, a pressure air chamber 3 is formed in an inner cavity of the static support 4, a pressure air chamber flow channel through which the heat supply air flow passes is formed in the pressure air chamber 3, and the rear end of the static support 4 and the air guide cone 1 are arranged at intervals to form an overflow port 8 through which the heat supply air flow passes between the air guide cone 1 and the static support 4.
The air guide cone 1 is provided with an air guide surface 10 facing the air compression chamber 3, the air guide surface 10 is a revolution surface with a central axis as a revolution center, and the air guide surface 10 is used for guiding hot air flow to the air guide cone 1. The air guide cone 1 is provided with a conical part protruding towards the static support 4, the conical part is approximately conical, the front end of the conical part is a tip, the outer surface of the tip of the conical part is a spherical crown 11, the outer surface of the part of the conical part, which is positioned on the rear side of the tip, is a conical surface 12, so that the conical surface 12 is arranged on the conical part around the tip, the conical surface 12 of the conical part is tangent to the spherical crown 11, the part of the air guide cone 1, which is positioned on the rear side of the conical part, is a flat plate part, which is provided with a forward plate surface, so that a flat surface 14 is arranged on the air guide cone 1 around the conical part, the flat surface 14 is an annular flat surface surrounding a circle of a central axis, an arc transition surface 13 is arranged between the flat surface 14 and the conical surface 12, and the arc transition surface 13 is a revolution surface taking the central axis as a revolution center and a bus as an arc line, and the arc line surrounds the circle of the central axis to form the arc transition surface 13, so that the conical surface 12 and the flat surface 14 are in smooth transition. The spherical cap 11, the conical surface 12, the arc transition surface 13 and the plane 14 jointly form the air guide surface 10.
The static support 4 is provided with a rear end face facing the air guide cone 1, a plane 14 of the air guide cone 1 is positioned on the rear side of the static support 4 and is opposite to the rear end face of the static support 4 in the front-back direction, and the overflowing opening 8 is formed by an annular gap between the plane 14 and the rear end face of the static support 4. The conical part of the air guide cone 1 extends into the air pressing chamber 3, the direction perpendicular to the central axis is radial, the middle part of the conical surface 12 of the conical part in the extending direction of the central axis corresponds to the rear end surface of the static support 4 in the radial position, the tip of the conical part crosses the rear end of the static support 4 and extends into the air pressing chamber 3, and the front part of the conical surface 12 of the conical part extends into the air pressing chamber 3, so that hot air flow can be guided conveniently, and hot air flow can pass through quickly.
One end of the gas blocking cover 2 close to the gas guide cone 1 is fixed on the gas guide cone 1, the rear end of the gas blocking cover 2 protrudes backwards out of the static support 4, and the rear end face of the gas blocking cover 2 is connected with the plane 14 of the gas guide cone 1. The gas shield 2 is a hollow body, and the rear end surface of the gas shield 2 is attached to the plane 14 of the gas guide cone 1, so that the plane 14 is connected with the inner circumferential surface of the gas shield 2, which is beneficial to smooth airflow channel and increase the gas flowing speed.
The inner peripheral surface of the gas blocking cover 2 and the outer peripheral surface of the static support 4 are arranged at intervals to form an annular flow channel between the gas blocking cover 2 and the static support 4, the annular flow channel is communicated with the flow passing port 8, the radial outward flow passing port 8 is formed between the gas guide cone 1 and the static support 4, hot gas flows through the conical surface 12 to be guided to flow out from the flow passing port 8 in the radial direction, and the smooth flowing of the air flow is facilitated and the air flow enters the annular flow channel.
Two communicating ports are arranged between the air compression chamber flow passage and the annular flow passage and are arranged at intervals along the extending direction of the central axis. The middle part of the static support 4 in the extension direction of the central axis is provided with a vent through which the heat supply air flow passes, and the vent is correspondingly communicated with the middle part of the annular flow channel. The vent hole and the overflowing hole 8 form two communicating holes which are arranged at intervals in the front and back. Set up the blow vent through the middle part at quiet support 4, thereby form the blow vent at middle part and two intercommunicating pores of 8 intercommunicating pores of opening that overflow of tip between plenum chamber runner and annular flow channel, the hot gas flow has partly to get into annular flow channel from the blow vent at middle part earlier, another part flows through terminal air guide awl 1 and gets into annular flow channel from terminal mouth 8 that overflows, thereby can utilize the blow vent to carry out the gradient cooperation with overflowing mouth 8 on gas flow path, reduce the burden of air guide awl 1, the durability is improved, be favorable to the hot gas flow to discharge fast.
The shield cover 5 covers the front end of establishing at quiet support 4, shield cover 5 includes ring body portion and barrel portion, the interior border of ring body portion is fixed with the outer peripheral face of quiet support 4, the inner peripheral surface of barrel portion sets up in order to form the annular with the outer peripheral face interval of quiet support 4, the front end that keeps off gas cover 2 stretches into in the annular, keep off the clearance between 2 outer peripheral faces of gas cover and the 5 inner peripheral surfaces of shield cover and keep off the clearance formation shield cover runner between 2 preceding terminal surfaces of gas cover and the 2 ring bodies of gas cover, form towards the export of back between 5 barrel rear ends of shield cover and the outer peripheral face of keeping off gas cover 2, discharge through the shield cover runner from annular flow channel with the heating air current. The pressure air chamber flow channel, the air guide surface 10, the overflowing opening 8, the vent, the annular flow channel and the shielding cover flow channel are used for forming a flow channel for discharging hot air flow in the arc extinguishing chamber.
The air guide surface in the shape can enable the airflow channel in the arc extinguish chamber to be smoother, and is beneficial to rapidly reducing the temperature in the airflow channel. The air guide cone is regular in shape, and a groove does not need to be formed, so that the processing difficulty is reduced, and the processing working hour is reduced.
The heat dissipation effect is simulated and compared and analyzed. As shown in fig. 4, 5, 6, 7, and 8, the temperature distribution cloud charts correspond to temperature distribution cloud charts of the arc extinguishing chamber of the circuit breaker at different moments in the arc burning stage, and the temperature distribution cloud charts can intuitively reflect the dynamic change process of the gas in the arc extinguishing chamber. The arcing phase is a process that starts arcing from 0 ms.
Fig. 4 is a temperature contour plot of the arc chute of the present invention at 12ms, when the high temperature region of the arc core is not diffused to the plenum, and fig. 5, 6, 7, and 8 are temperature contour plots at 14ms, 15ms, 16ms, and 17ms, respectively, with the temperature gradually diffused throughout the gas flow path.
Fig. 9, 10, 11, 12, and 13 are cloud graphs of temperature distributions at different times of an arc stage of the arc extinguishing chamber of the related art shown in fig. 1, fig. 9 is a temperature contour map at 12ms when a high temperature region of an arc core is not diffused to a puffer chamber, and fig. 10, 11, 12, and 13 are temperature contour maps at 14ms, 15ms, 16ms, and 17ms, respectively, and the temperature is gradually diffused to the entire gas flow passage.
By comparing the temperature contour line distribution diagram of the arc extinguish chamber in the invention and the temperature contour line distribution diagram of the arc extinguish chamber in the prior art at the same time, the temperature in the air flow channel of the arc extinguish chamber in the prior art is obviously higher, the air guide cone influences the heat dissipation, the overall temperature in the air flow channel of the arc extinguish chamber in the invention is obviously reduced, and the air guide cone in the invention effectively improves the overall heat dissipation capability of the equipment.
Simulation analysis proves that under the condition of not changing other structures and conditions, compared with the existing air guide cone, the air guide cone with the air guide surface in the shape has the advantages that under the same through-flow condition, the temperature in the air flow channel is reduced more quickly, the heat dissipation capacity is effectively improved, the electric arc cooling is accelerated, and the standard and standard requirements are met. Make high temperature high pressure SF in the air compression chamber 6 The gas escapes quickly, the temperature is reduced quickly, so that the electric arc is cooled and extinguished quickly, the ablation of a contact is reduced, the through-current capacity of the gas is improved, the breaking capacity of the circuit breaker is improved, the service life of the circuit breaker is prolonged, and the product competitiveness is improved.
Embodiment 2 of arc chute of circuit breaker of the invention:
the difference between this embodiment and embodiment 1 is that in embodiment 1, the end surface of the air blocking cover near one end of the air guiding cone is connected with the plane. In this embodiment, the rear end of the air blocking cover is covered on the outer circumferential surface of the air guiding cone, and the inner circumferential surface of the air blocking cover is attached to the outer circumferential surface of the air guiding cone.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments without inventive effort, or some technical features of the present invention may be substituted with equivalents. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. The utility model provides an explosion chamber of circuit breaker, include air guide awl (1) and quiet support (4) for the coaxial setting of central axis, quiet support (4) are the tube structure, the inner chamber of quiet support (4) forms plenum chamber (3), be equipped with air guide face (10) towards plenum chamber (3) on air guide awl (1), air guide face (10) are with the surface of revolution that central axis is centre of rotation, air guide face (10) are used for leading the hot gas flow on air guide awl (1), air guide awl (1) and quiet support (4) interval set up in order to form overflow mouth (8) between air guide awl (1) and quiet support (4), characterized by, air guide awl (1) have towards the convex toper portion of quiet support (4), the most advanced surface of toper portion is spherical crown (11), be equipped with conical surface (12) around most advanced on the toper portion, conical surface (12) with spherical crown (11) are tangent, be equipped with plane (14) around the toper portion on air guide awl (1), be equipped with between plane (14) and conical surface (12) transition conical surface (13), the conical surface (13) jointly form circular arc crown (10).
2. Arc chamber of a circuit breaker according to claim 1, characterized in that the cone extends into the puffer chamber (3).
3. Arc chute of a circuit breaker according to claim 2, characterized in that the stationary holder (4) has a rear end face directed towards the pilot cone (1), radially in a direction perpendicular to the central axis, the middle of the conical surface (12) of the conical portion in the direction of extension of the central axis corresponding in position in the radial direction to the rear end face of the stationary holder (4).
4. Arc chute of a circuit breaker according to claim 3, characterized in that said plane (14) is located on the rear side of the static seat (4) and is in front-rear opposition to the rear end face of the static seat (4), the annular gap between said plane (14) and the rear end face of the static seat (4) forming said through-flow opening (8).
5. The arc extinguish chamber of the circuit breaker according to claim 1, 2, 3 or 4, characterized by further comprising a gas blocking cover (2), wherein the gas blocking cover (2) covers the outer periphery of the static support (4), the inner peripheral surface of the gas blocking cover (2) and the outer peripheral surface of the static support (4) are arranged at intervals to form an annular flow passage between the gas blocking cover (2) and the static support (4), the annular flow passage is communicated with the overflowing port (8), one end of the gas blocking cover (2), which is close to the gas guide cone (1), is fixed on the gas guide cone (1), and the plane (14) is connected with the inner peripheral surface of the gas blocking cover (2).
6. Arc chamber of a circuit breaker according to claim 5, characterized in that the end face of the shield (2) close to the end of the gas-guiding cone (1) is connected to said plane (14).
7. Arc extinguish chamber of a circuit breaker according to claim 5, characterized in that a chamber channel for the passage of a heating gas flow is provided in the chamber (3), and two communication ports are provided between the chamber channel and the annular channel, the two communication ports being spaced apart in the direction of extension of the central axis; the middle part of the static support (4) in the extension direction of the central axis is provided with a vent through which the heat supply air flow passes, and the vent is correspondingly communicated with the middle part of the annular flow passage; the vent and the overflowing port (8) form two communicating ports.
CN202210786628.3A 2022-07-04 2022-07-04 Arc extinguish chamber of circuit breaker Pending CN115295356A (en)

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CN202210786628.3A CN115295356A (en) 2022-07-04 2022-07-04 Arc extinguish chamber of circuit breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210786628.3A CN115295356A (en) 2022-07-04 2022-07-04 Arc extinguish chamber of circuit breaker

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CN115295356A true CN115295356A (en) 2022-11-04

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CN202210786628.3A Pending CN115295356A (en) 2022-07-04 2022-07-04 Arc extinguish chamber of circuit breaker

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