CN221201012U - Zero flashover exhaust device of isolating switch and isolating switch - Google Patents

Abstract

The application provides a zero flashover exhaust device of an isolating switch and the isolating switch. The zero flashover exhaust device comprises: an exhaust structure, a flashover isolation structure and a dust collection groove; the exhaust structure is arranged on the side wall of the isolating switch shell, and the inside of the isolating switch is communicated with the outside of the isolating switch through the exhaust structure; the dust collecting groove is of a deep groove structure with one end open, and one end of the opening of the dust collecting groove is close to the flashover escape opening; one end of the flashover isolation structure is fixed at the top of the isolating switch shell, and the other end of the flashover isolation structure extends into the dust collection groove; the flashover isolation structure is used for isolating electric arcs escaping from the flashover escaping port and preventing the electric arcs escaping from the flashover escaping port from escaping from the exhaust structure to the outside of the isolating switch; the part of the flashover isolation structure extending into the dust collection groove and the dust collection groove form an exhaust channel, the exhaust channel comprises an airflow inlet and an airflow outlet, the airflow inlet is close to the flashover escape opening, and the airflow outlet is close to the exhaust structure. The functions of exhausting, collecting dust and avoiding electric arc escaping are realized.

Description

Zero flashover exhaust device of isolating switch and isolating switch

Technical Field

The application relates to the technical field of electronics, in particular to a zero flashover exhaust device of an isolating switch and the isolating switch.

Background

The arc extinguishing chamber of the isolating switch plays an important role in the isolating switch, and can limit the electric arc generated in the breaking process of the contact assembly to the inside of the arc extinguishing chamber and effectively extinguish the electric arc. However, because the arc extinguishing chamber can have arc extinguishing airflow in the arc extinguishing process, if the arc extinguishing airflow is not reasonably treated, discharged or recycled, the safety of the environment and operators can be affected. Therefore, the isolating switch is generally provided with an exhaust device for treating and discharging arc-extinguishing airflow, but as the exhaust device needs to be communicated with the outside, flashover in the arc-extinguishing chamber can escape out of the isolating switch through the exhaust device, and damage can be caused to equipment and surrounding equipment or personnel.

In the related art, the zero-flashover exhaust device can effectively control and inhibit escaping arcs in the arc extinguishing chamber, and safely exhaust gas generated during arc extinguishing, so as to protect equipment and surrounding environment. But some particles are also generated during the arc breaking process, including: metal oxide particles, carbide particles, dust particles and the like, and the particles cannot be treated, so that the damage such as air pollution, damage to electrical equipment and the like can be generated.

Disclosure of utility model

The application provides a zero flashover exhaust device of an isolating switch and the isolating switch, which are used for solving the problem that the isolating device can cause the escape of electric arcs and particles to cause risks when the isolating device is used for exhausting, and realizing that the isolating switch has an exhaust function and simultaneously can prevent the escape of the particles and the electric arcs, thereby avoiding the risks caused by the escape of the particles and the risks caused by the escape of the electric arcs.

In a first aspect, the present application provides a zero-flashover exhaust device of an isolating switch, disposed at a flashover exit of an arc extinguishing chamber, the zero-flashover exhaust device comprising: an exhaust structure, a flashover isolation structure and a dust collection groove; the exhaust structure is arranged on the side wall of the isolating switch shell, and the inside of the isolating switch is communicated with the outside of the isolating switch through the exhaust structure; the dust collecting groove is of a deep groove structure with one end open, and one end of the dust collecting groove open is close to the flashover escape opening; one end of the flashover isolation structure is fixed at the top of the isolating switch shell, and the other end of the flashover isolation structure extends into the dust collection groove; the flashover isolation structure is used for isolating electric arcs escaping from the flashover escaping port and preventing the electric arcs escaping from the flashover escaping port from escaping from the exhaust structure to the outside of the isolating switch; the part of the flashover isolation structure extending into the dust collection groove and the dust collection groove form an exhaust channel, the exhaust channel comprises an airflow inlet and an airflow outlet, the airflow inlet is close to the flashover escape opening, and the airflow outlet is close to the exhaust structure.

The zero flashover exhaust device provided by the first aspect comprises an exhaust structure, a flashover isolation structure and a dust collection groove. The exhaust structure is arranged on the side wall of the isolating switch shell, and the inside of the isolating switch and the outside of the isolating switch can be communicated through the exhaust structure so as to enable the air flow in the arc extinguishing chamber to be normally discharged; the dust collecting tank is of a deep tank structure with one end open, one end of the dust collecting tank open is close to the flashover escape opening, particles enter the dust collecting tank from the flashover escape opening and are deposited at the bottom of the deep tank to block the escape path of the particles; one end of the flashover isolation structure is fixed at the top of the isolating switch shell, and the other end of the flashover isolation structure extends into the dust collection groove; the part of the flashover isolating structure which does not extend into the dust collecting groove is combined with the outer wall of the dust collecting groove, the flashover escape opening is completely separated from the exhaust structure, and the electric arc escaping from the flashover escape opening is impacted on the flashover isolating structure and the outer wall of the dust collecting groove, so that the electric arc is prevented from escaping from the exhaust structure to the outside of the isolating switch directly; the part of the arc-extinguishing isolating structure extending into the dust collecting groove and the dust collecting groove form an exhaust channel, the exhaust channel comprises an airflow inlet and an airflow outlet, the airflow inlet is close to the arc-extinguishing escape opening, the airflow outlet is close to the exhaust structure, airflow in the arc-extinguishing chamber flows into the airflow inlet from the arc-extinguishing escape opening, flows to the exhaust structure from the airflow outlet through the exhaust channel, and is discharged out of the isolating switch through the exhaust structure. By the above, the isolating switch has the exhaust function, and simultaneously can prevent particles and electric arcs from escaping, so that the risks caused by escaping of the particles and the risks caused by escaping of the electric arcs are avoided.

In one possible design, the inner diameter of the airflow outlet is larger than the inner diameter of the airflow inlet; or the inner diameter of the air flow outlet is equal to the inner diameter of the air flow inlet.

With the embodiment, since the dust collecting tank is of a deep tank structure, upward propelling force is required when the airflow flows to the bottom of the dust collecting tank, the propelling force depends on the pressure difference between the airflow outlet and the airflow inlet, and the airflow speed is higher when the pressure difference is larger. When the inner diameter of the air outlet is smaller than that of the air inlet, the pressure difference between the air outlet and the air inlet is a negative pressure difference, which can cause the air to flow out of the air outlet and escape due to too slow flow speed, therefore, the inner diameter of the air outlet must be larger than or equal to that of the air inlet to ensure enough pressure difference.

In one possible design, one or more isolation plates are provided on the inner wall of the dust collection tank, the length of the isolation plates is smaller than the inner diameter of the exhaust channel, and the isolation plates are used for isolating the escape path of the electric arc escaping from the flashover escape opening along the exhaust channel.

By providing this embodiment, when the electric arc escaping from the flashover escape opening impinges on the flashover isolation structure, a resilience force exists, which may cause the electric arc to enter the exhaust channel, in order to avoid that the electric arc entering the exhaust channel escapes together with the air flow, one or more isolation plates are provided in the inner diameter of the exhaust channel, and the electric arc impinges on the isolation plates after entering the exhaust channel, thereby further avoiding the possibility of arc escaping.

In one possible design, the bottom of the arcing isolation structure is provided with a U-shaped hook, an opening of the U-shaped hook is close to the arcing escape opening, and the U-shaped hook is used for reducing initial kinetic energy when the arc enters the exhaust passage.

According to the embodiment, the U-shaped hook is arranged at the bottom of the flashover isolation structure, so that the electric arc escaping from the flashover escape opening falls into the U-shaped hook when striking the flashover isolation structure; when the electric arc falls into the U-shaped hook, the electric arc needs to consume the self kinetic energy to rush out of the U-shaped hook and then enter the exhaust channel, so that the initial kinetic energy when the electric arc enters the exhaust channel is reduced, and the possibility that the electric arc escapes from the air flow outlet is further reduced.

In one possible design, the dust collection groove is a U-shaped deep groove; or the dust collection groove is a V-shaped deep groove.

With the embodiment provided, the dust collection groove is selected from the U-shaped deep groove or the V-shaped deep groove depending on the assembly condition in the isolating switch, and the U-shaped deep groove can be selected when the assembly space in the isolating switch is enough; when the assembly space in the isolating switch is insufficient, the V-shaped deep groove is selected, so that the assembly space can be saved.

In one possible design, the exhaust structure is an exhaust plate arranged on the inner wall of the isolating switch, and a plurality of through holes are arranged on the exhaust plate.

According to the exhaust plate, the exhaust structure is designed to be provided with the plurality of through holes, the structure of the exhaust plate is simple, and the plurality of through holes can meet the exhaust requirement while the production cost is reduced.

In a second aspect, the present application provides an isolating switch comprising: the zero arcing exhaust apparatus, contact assembly, arc chute and isolator housing of any of the above embodiments; the contact assembly comprises a moving contact and a fixed contact, and when the contact between the moving contact and the fixed contact is disconnected, an electric arc is generated between the moving contact and the fixed contact; the arc-extinguishing chamber is arranged between the moving contact and the fixed contact and used for elongating the electric arc and extinguishing the electric arc, and is provided with an arc-extinguishing outlet for exhausting gas generated in the arc-extinguishing chamber; the zero-flashover exhaust is arranged at a flashover escape port of the arc extinguishing chamber and used for capturing electric arcs escaping from the flashover escape port; the isolating switch shell is of a shell structure with a closed accommodating cavity, and the zero flashover exhaust device, the contact assembly and the arc extinguishing chamber are all arranged in the isolating switch shell.

In one possible design, the isolating switch comprises one or more contact assemblies, each corresponding to one arc extinguishing chamber; one of the arc extinguishing chambers corresponds to one zero-flashover exhaust device.

By the method, the number of zero-flashover exhaust devices corresponds to the number of arc extinguishing chambers, and the number of the arc extinguishing chambers corresponds to the number of contact assemblies; a plurality of zero flashover exhaust devices can be arranged in the isolating switch provided with a plurality of contact assemblies so as to ensure that electric arcs generated by breaking of each contact assembly cannot escape.

In one possible design, when the contact between the moving contact and the fixed contact is disconnected, the outer contour shape of the arc extinguishing chamber corresponds to the movement track of the moving contact; when the moving contact moves along the movement track, the arc-extinguishing chamber always covers the moving contact in the arc-extinguishing range of the arc-extinguishing chamber.

According to the arc extinguishing chamber, the outer contour shape of the arc extinguishing chamber corresponds to the motion track of the moving contact, and when the moving contact moves along the motion track, the arc extinguishing range of the arc extinguishing chamber can always cover the moving contact, so that the arc extinguishing chamber can comprehensively and accurately eliminate the arc between the moving contact and the fixed contact no matter the moving contact rotates to any position in the breaking process of the contact assembly, and the optimal arc extinguishing effect is achieved.

The advantages provided by the second aspect and the possible designs of the second aspect may be referred to the advantages provided by the first aspect and the possible embodiments of the first aspect, and are not described herein.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a first configuration of a zero-flashover exhaust device according to an embodiment of the present application;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a schematic diagram of a second structure of a zero-flashover exhaust device according to an embodiment of the present application;

FIG. 4 is an enlarged view of a portion of FIG. 2;

FIG. 5 is a schematic diagram of a third configuration of a zero-flashover exhaust device according to an embodiment of the present application;

FIG. 6 is an enlarged view of a portion of FIG. 3;

FIG. 7 is a schematic diagram of an exhaust structure according to an embodiment of the present application;

Fig. 8 is a schematic structural diagram of two arc extinguishing chambers and two moving contacts in an embodiment of the present application;

fig. 9 is a schematic diagram of a connection relationship between two arc extinguishing chambers and two moving contacts in an embodiment of the present application.

Reference numerals illustrate:

1-zero flashover exhaust device; 11-an exhaust structure; 111-through holes; 12-flashover isolation structure; 121-U-shaped hooks; 13-a dust collection tank; 14-an exhaust passage; 141-an air flow inlet; 142-an airflow outlet; 15-a separator;

2-an isolating switch housing;

3-an arc extinguishing chamber; 31-flashover escape port; 31 arc extinction range

4-A moving contact.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the applications herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

The terms "comprising" and "having" and any variations thereof in the description and claims of the application and in the description of the drawings are intended to cover and not exclude other matters. The word "a" or "an" does not exclude the presence of a plurality.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The directional terms appearing in the following description are those directions shown in the drawings and do not limit the specific structure of the application. For example, in the description of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Further, expressions of directions of indication such as X-direction, Y-direction, and Z-direction for explaining the operation and configuration of the respective members of the present embodiment are not absolute but relative, and although these indications are appropriate when the respective members of the battery pack are in the positions shown in the drawings, when these positions are changed, these directions should be interpreted differently to correspond to the changes.

Furthermore, the terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order, and may be used to improve one or more of these features either explicitly or implicitly.

In the description of the present application, unless otherwise indicated, the meaning of "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two).

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, e.g., as a "connected" or "coupled" of a mechanical structure may refer to a physical connection, e.g., as a fixed connection, e.g., via a fastener, such as a screw, bolt, or other fastener; the physical connection may also be a detachable connection, such as a snap-fit or snap-fit connection; the physical connection may also be an integral connection, such as a welded, glued or integrally formed connection. "connected" or "connected" of circuit structures may refer to physical connection, electrical connection or signal connection, for example, direct connection, i.e. physical connection, or indirect connection through at least one element in the middle, so long as circuit communication is achieved, or internal communication between two elements; signal connection may refer to signal connection through a medium such as radio waves, in addition to signal connection through a circuit. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

An arc phenomenon occurs when a contact assembly (not shown) in a disconnector (not shown) performs an opening operation, and arc extinguishing is generally performed through an arc extinguishing chamber 3 provided in the disconnector, so as to eliminate an arc generated by the contact assembly and to avoid the hazard of the arc. Since the arc extinguishing chamber 3 generates an air flow (not shown) during arc extinguishing, the air flow needs to be exhausted from the arc extinguishing chamber 3, an exhaust structure (not shown) for exhausting air is arranged on the arc extinguishing chamber 3, and an exhaust structure 11 is also arranged on the shell of the isolating switch, so that the air flow is exhausted out of the device. Because the arc generated by the contact assembly during breaking also escapes from the arc-extinguishing chamber 3 by the exhaust structure 11 and out of the device, the exhaust structure on the arc-extinguishing chamber 3 is hereinafter referred to as an arcing escape opening for convenience in distinguishing the exhaust structure on the arc-extinguishing chamber 3 from the exhaust structure 11 on the disconnector housing 2.

The escape of the arc (not shown) from the flashover exit and exhaust structure 11 to the outside of the apparatus can present a safety hazard to the operator and the apparatus itself. It is therefore necessary to provide an isolation structure in the path of the arc escape that prevents the arc from continuing to escape.

During the arc breaking process, some particles (not shown) can also escape out of the equipment along with the airflow, and the damage such as air pollution, equipment damage and the like can be generated. In order to minimize the risk of particulate matter, it is desirable to avoid the generation of particulate matter or to block the particulate matter discharge pathway. Avoiding the generation of particulate matters is not practical, and the structure of the arc extinguishing chamber 3 is generally optimized in the prior art so as to reduce the generation of the particulate matters, but the influence of the particulate matters still cannot be completely avoided by reducing the generation of the particulate matters; thus, starting from blocking the discharge path of the particulate matter, interception is performed before the particulate matter escapes from the device, so as to avoid the risk of escape of the particulate matter.

Based on the above conception, the application provides the zero-flashover exhaust device of the isolating switch and the isolating switch, which can ensure that the air flow in the arc extinguishing chamber 3 of the isolating switch is normally discharged and simultaneously avoid the electric arc and the particulate matters from escaping along with the air flow.

The specific technical scheme is as follows:

As shown in fig. 1 to 6, a first aspect of the embodiment of the present application provides a zero-flashover exhaust device 1 of a disconnecting switch, which is disposed at a flashover escape port of an arc extinguishing chamber 3, the zero-flashover exhaust device 1 comprising: an exhaust structure 11, a flashover isolation structure 12 and a dust collection tank 13; the exhaust structure 11 is arranged on the side wall of the isolating switch shell 2, and the inside of the isolating switch and the outside of the isolating switch can be communicated through the exhaust structure 11; the dust collecting groove 13 is of a deep groove structure with one end open, and one end of the dust collecting groove 13 open is close to the flashover escape opening; one end of the flashover isolation structure 12 is fixed at the top of the isolating switch shell 2, and the other end of the flashover isolation structure 12 extends into the dust collection groove 13; the flashover isolation structure 12 is used for isolating the electric arc escaping from the flashover escape port and preventing the electric arc escaping from the flashover escape port from escaping from the exhaust structure 11 to the outside of the isolating switch; the part of the flashover isolation structure 12 extending into the dust collection groove 13 and the dust collection groove 13 form an exhaust passage 14, the exhaust passage 14 comprises an air flow inlet 141 and an air flow outlet 142, the air flow inlet 141 is close to the flashover escape opening, and the air flow outlet 142 is close to the exhaust structure 11.

The zero-flashover exhaust device 1 provided by the first aspect of the application comprises an exhaust structure 11, a flashover isolation structure 12 and a dust collection groove 13, wherein the exhaust structure 11 is arranged on the side wall of the isolating switch shell 2, and the inside of the isolating switch and the outside of the isolating switch can be communicated through the exhaust structure 11 so as to enable the air flow in the arc extinguishing chamber 3 to be normally discharged.

Further, as shown in fig. 1 to 6, the dust collecting groove 13 has a deep groove structure with an opening at one end, one end of the dust collecting groove 13 with an opening is close to the flashover outlet, and particles enter the dust collecting groove 13 from the flashover outlet and are deposited at the bottom of the deep groove to block the escape path of the particles.

Further, as shown in fig. 1 to 6, one end of the arcing insulation structure 12 is fixed on the top of the insulation switch housing 2, and the other end of the arcing insulation structure 12 extends into the dust collection groove 13; the part of the flashover isolating structure 12 which does not extend into the dust collecting groove 13 is combined with the outer wall of the dust collecting groove 13 to completely separate the flashover escape opening from the exhaust structure 11, and the electric arc escaping from the flashover escape opening collides with the flashover isolating structure 12 and the outer wall of the dust collecting groove 13 to prevent the electric arc from escaping from the exhaust structure 11 to the outside of the isolating switch directly.

Further, as shown in fig. 1 to 6, the part of the arcing shield structure 12 extending into the dust collecting tank 13 and the dust collecting tank 13 form an exhaust passage 14, the exhaust passage 14 includes an air flow inlet 141 and an air flow outlet 142, the air flow inlet 141 is close to the arcing escape opening, the air flow outlet 142 is close to the exhaust structure 11, the air flow in the arc extinguishing chamber 3 flows from the arcing escape opening into the air flow inlet 141, passes through the exhaust passage 14 and flows from the air flow outlet 142 to the exhaust structure 11, and the air flow is discharged outside the isolation switch through the exhaust structure 11.

The exhaust channel 14 formed by the part of the flashover isolation structure 12 extending into the dust collection groove 13 and the exhaust structure 11 arranged on the side wall of the isolation switch are used for completing the discharge of air flow; the arc is prevented from escaping to the outside of the isolating switch by the flashover isolating structure 12 and the outer wall of the dust collecting groove 13; by depositing the particles at the bottom of the dust collection groove 13, the path of the particles escaping is blocked, and the particles are prevented from escaping to the outside of the isolating switch; the isolating switch has the exhaust function, meanwhile, particles and electric arcs can be prevented from escaping, and risks caused by escaping of the particles and risks caused by escaping of the electric arcs are avoided.

In some embodiments, the dust collection slot 13 is a U-shaped deep slot; or the dust collection groove 13 is a V-shaped deep groove.

With this embodiment, the dust collection groove 13 is selected to be a U-shaped deep groove or a V-shaped deep groove depending on the fitting condition in the disconnector, and the U-shaped deep groove may be selected when the fitting space in the disconnector is sufficient; when the assembly space in the isolating switch is insufficient, the V-shaped deep groove is selected, so that the assembly space can be saved. As an example, as shown in fig. 2, 4 and 6, the dust collection groove 13 is a V-shaped deep groove.

As shown in fig. 2, 4, and 6, in some embodiments, the inner diameter of the airflow outlet 142 is greater than the inner diameter of the airflow inlet 141; or the inner diameter of the air flow outlet 142 is equal to the inner diameter of the air flow inlet 141.

Specifically, the portion of the arcing shield structure 12 extending into the dust collection groove 13 is set as a first portion, and the dust collection groove 13 is set as a second portion; the outer wall of the first portion and the inner wall of the second portion may be considered as conduit walls of the exhaust passage 14, where the distance between the outer wall of the first portion and the inner wall of the second portion is the inner diameter of the exhaust conduit.

Further, the first portion comprises a first outer wall near the flashover exit and a second outer wall near the exhaust structure 11, and the second portion comprises a first inner wall near the flashover exit and a second inner wall near the exhaust structure 11; the distance between the first outer wall and the first inner wall is the inner diameter of the air flow inlet 141, and the distance between the second outer wall and the second inner wall is the inner diameter of the air flow outlet 142.

When the distance between the second outer wall and the second inner wall is greater than the distance between the first outer wall and the first inner wall, that is, the inner diameter of the air flow outlet 142 is greater than the inner diameter of the air flow inlet 141; when the distance between the second outer wall and the second inner wall is equal to the distance between the first outer wall and the first inner wall, that is, the inner diameter of the air flow outlet 142 is equal to the inner diameter of the air flow inlet 141.

With the embodiment, since the dust collection groove 13 is a U-shaped or V-shaped deep groove, the air flow channel formed by the flashover isolation structure 12 extending into the dust collection groove 13 and the dust collection groove 13 is also a U-shaped or V-shaped channel, and an upward pushing force is required when the air flow flows to the bottom of the dust collection groove 13, the pushing force depends on the pressure difference between the air flow outlet 142 and the air flow inlet 141, and the higher the pressure difference, the higher the air flow speed. When the inner diameter of the air flow outlet 142 is smaller than the inner diameter of the air flow inlet 141, the pressure difference between the air flow outlet 142 and the air flow inlet 141 is a negative pressure difference, which results in that the air flow cannot flow out of the air flow outlet 142 and escape due to too slow flow speed, and therefore, the inner diameter of the air flow outlet 142 must be larger than or equal to the inner diameter of the air flow inlet 141 to ensure a sufficient pressure difference.

As shown in fig. 3 to 6, in some embodiments, one or more isolation plates 15 are provided on the inner wall of the dust collection tank 13, the length of the isolation plates 15 being smaller than the inner diameter of the exhaust passage 14, the isolation plates 15 being used to isolate the escape path of the arc escaping in the flashover escape opening along the exhaust passage 14.

By providing this embodiment, there is a spring back force when the electric arc escaping from the flashover escape opening impinges on the flashover isolation structure 12, which spring back force may cause the electric arc to enter the exhaust channel 14, in order to avoid that the electric arc entering the exhaust channel 14 escapes together with the air flow, one or more isolation plates 15 are provided in the inner diameter of the exhaust channel 14, and the electric arc impinges on the isolation plates 15 after entering the exhaust channel 14, further avoiding the possibility of an electric arc escaping.

As shown in fig. 5 and 6, in some embodiments, a U-shaped hook 121 is disposed at the bottom of the arcing shield 12, where the opening of the U-shaped hook 121 is near the arcing escape opening, and the U-shaped hook 121 is used to reduce the initial kinetic energy of the arc as it enters the exhaust passage 14.

By the embodiment, the U-shaped hook 121 is arranged at the bottom of the flashover isolation structure 12, so that the electric arc escaping from the flashover escape opening falls into the U-shaped hook 121 when striking the flashover isolation structure 12; when the arc falls into the U-shaped hook 121, the arc needs to consume the kinetic energy of the arc to rush out of the U-shaped hook 121 and then enter the exhaust channel 14, so that the initial kinetic energy of the arc entering the exhaust channel 14 is reduced, and the possibility that the arc escapes from the airflow outlet 142 is further reduced.

As shown in fig. 7, in some embodiments, the exhaust structure 11 is an exhaust plate that is opened on an inner wall of the isolating switch, and a plurality of through holes 111 are disposed on the exhaust plate.

By the embodiment, the exhaust structure 11 is designed as an exhaust plate provided with a plurality of through holes 111, the exhaust plate is simple in structure, and the plurality of through holes 111 can meet the exhaust requirement while reducing the production cost.

In some embodiments, the number of through holes 111 corresponds to the expected emissions of the disconnector. As an example, the number of through holes 111 of the disconnecting switch whose expected discharge amount is large is larger than the number of through holes 111 of the disconnecting switch whose expected discharge amount is small.

A second aspect of an embodiment of the present application provides an isolating switch, including: the zero arcing exhaust apparatus 1, the contact assembly, the arc extinguishing chamber 3 and the disconnector housing 2 according to any of the above embodiments; the contact assembly comprises a moving contact 4 and a fixed contact, and when the contact between the moving contact 4 and the fixed contact is disconnected, an electric arc is generated between the moving contact 4 and the fixed contact; the arc extinguishing chamber 3 is arranged between the moving contact 4 and the fixed contact and is used for elongating and extinguishing an electric arc, and an arc-flash escape opening is arranged on the arc extinguishing chamber 3 and is used for discharging gas generated in the arc extinguishing chamber 3; the zero flashover exhaust is arranged at the flashover escape opening of the arc extinguishing chamber 3 and is used for capturing electric arcs escaping from the flashover escape opening; the isolating switch shell 2 is of a shell structure with a closed accommodating cavity, and the zero flashover exhaust device 1, the contact assembly and the arc extinguishing chamber 3 are all arranged in the isolating switch shell 2.

In some embodiments, the isolating switch comprises one or more contact assemblies, each corresponding to one arc extinguishing chamber 3; one arc extinguishing chamber 3 corresponds to one zero flashover exhaust device 1.

By the embodiment, the number of zero-flashover exhaust devices 1 corresponds to the number of arc extinguishing chambers 3, and the number of arc extinguishing chambers 3 corresponds to the number of contact assemblies; a plurality of zero arcing vents 1 may be provided in a disconnector provided with a plurality of contact assemblies to ensure that arcing generated by breaking each contact assembly does not escape.

As an example, as shown in fig. 8, the disconnector comprises two contact assemblies, and correspondingly, two arc extinguishing chambers 3 and two zero-flashover exhaust devices 1.

As shown in fig. 9, in some embodiments, when the contact between the moving contact 4 and the fixed contact is broken, the outer contour shape of the arc extinguishing chamber 3 corresponds to the movement track of the moving contact 4; when the moving contact 4 moves along the movement track, the arc extinguishing chamber 3 always covers the moving contact 4 in the arc extinguishing range 31 of the arc extinguishing chamber 3.

By the aid of the method, the outer contour shape of the arc-extinguishing chamber 3 corresponds to the motion track of the moving contact 4, and when the moving contact 4 moves along the motion track, the arc-extinguishing range 31 of the arc-extinguishing chamber 3 can always cover the moving contact 4, so that in the breaking process of the contact assembly, no matter the moving contact 4 rotates to any position, the arc-extinguishing chamber 3 can comprehensively and accurately eliminate an arc between the moving contact 4 and the fixed contact, and the optimal arc-extinguishing effect is achieved.

The advantages provided by the second aspect and the possible designs of the second aspect may be referred to the advantages provided by the first aspect and the possible embodiments of the first aspect, and are not described herein.

Those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (9)

1. The utility model provides a isolator's zero flashover exhaust apparatus, sets up in the flashover escape mouth department of explosion chamber, its characterized in that includes: an exhaust structure, a flashover isolation structure and a dust collection groove;

The exhaust structure is arranged on the side wall of the isolating switch shell, and the inside of the isolating switch is communicated with the outside of the isolating switch through the exhaust structure;

the dust collecting groove is of a deep groove structure with one end open, and one end of the dust collecting groove open is close to the flashover escape opening;

One end of the flashover isolation structure is fixed at the top of the isolating switch shell, and the other end of the flashover isolation structure extends into the dust collection groove; the flashover isolation structure is used for isolating electric arcs escaping from the flashover escaping port and preventing the electric arcs escaping from the flashover escaping port from escaping from the exhaust structure to the outside of the isolating switch;

The part of the flashover isolation structure extending into the dust collection groove and the dust collection groove form an exhaust channel, the exhaust channel comprises an airflow inlet and an airflow outlet, the airflow inlet is close to the flashover escape opening, and the airflow outlet is close to the exhaust structure.

2. The zero flash exhaust device of claim 1, wherein an inner diameter of the airflow outlet is greater than an inner diameter of the airflow inlet;

or alternatively

The inner diameter of the airflow outlet is equal to the inner diameter of the airflow inlet.

3. The zero arcing exhaust apparatus of claim 2, wherein one or more isolation plates are provided on an inner wall of the dust collection tank, the isolation plates having a length smaller than an inner diameter of the exhaust passage, the isolation plates for isolating an escape path along the exhaust passage of an arc escaping from the arcing escape opening.

4. A zero arcing exhaust apparatus according to claim 2 or 3, wherein the bottom of the arcing insulation structure is provided with a U-shaped hook, the opening of the U-shaped hook being close to the arcing escape opening, the U-shaped hook being adapted to reduce the initial kinetic energy of the arc as it enters the exhaust channel.

5. The zero arcing exhaust apparatus of claim 4, wherein the dust collection slot is a U-shaped deep slot;

or alternatively

The dust collection groove is a V-shaped deep groove.

6. The zero-flashover exhaust device according to claim 5 wherein the exhaust structure is an exhaust plate provided on an inner wall of the isolating switch, the exhaust plate being provided with a plurality of through holes.

7. A disconnector comprising the zero arcing exhaust apparatus of any of claims 1-6, a contact assembly, an arc chute and a disconnector housing;

The contact assembly comprises a moving contact and a fixed contact, and when the contact between the moving contact and the fixed contact is disconnected, an electric arc is generated between the moving contact and the fixed contact;

The arc-extinguishing chamber is arranged between the moving contact and the fixed contact and used for elongating the electric arc and extinguishing the electric arc, and is provided with an arc-extinguishing outlet for exhausting gas generated in the arc-extinguishing chamber;

The zero-flashover exhaust is arranged at a flashover escape port of the arc extinguishing chamber and used for capturing electric arcs escaping from the flashover escape port;

The isolating switch shell is of a shell structure with a closed accommodating cavity, and the zero flashover exhaust device, the contact assembly and the arc extinguishing chamber are all arranged in the isolating switch shell.

8. The disconnector according to claim 7, comprising one or more contact assemblies, each of the contact assemblies corresponding to one of the arc chambers; one of the arc extinguishing chambers corresponds to one zero-flashover exhaust device.

9. The isolating switch according to claim 8, wherein when the contact between the moving contact and the fixed contact is broken, the outer contour shape of the arc extinguishing chamber corresponds to the movement track of the moving contact;

When the moving contact moves along the movement track, the arc-extinguishing chamber always covers the moving contact in the arc-extinguishing range of the arc-extinguishing chamber.