CN212625458U

CN212625458U - Arc extinguish chamber for electrical protection device and electrical protection device

Info

Publication number: CN212625458U
Application number: CN202021403387.2U
Authority: CN
Inventors: 王远钟; 肖家忍; 夏学东; F.乔多特; O.卡拉加克; J-P.戈内特
Original assignee: Schneider Electric Industries SAS
Current assignee: Schneider Electric Industries SAS
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2021-02-26
Anticipated expiration: 2030-07-16

Abstract

The present disclosure relates to an arc chute for an electrical protection device, the electrical protection device including an arc formation chamber including a stationary contact and a movable contact, wherein an arc is formed between the stationary contact and the movable contact when the stationary contact and the movable contact are separated, the arc formation chamber being in communication with an inlet of the arc chute, the arc chute characterized in that the arc chute includes a first tongue portion, the first tongue portion being disposed between a downstream of the arc chute and an outlet of the arc chute and extending from a first side of the arc chute in a first direction perpendicular to an exhaust direction to form a U-shaped exhaust passage.

Description

Arc extinguish chamber for electrical protection device and electrical protection device

Technical Field

The utility model relates to an arc extinguish chamber for an electric protection device and an electric protection device comprising the arc extinguish chamber.

Background

Known circuit breakers make and break electrical circuits by bringing moving and stationary contacts in a contact arrangement into and out of contact. An arc is generated when the moving contact and the fixed contact are separated. Circuit breakers typically require an arc chute for accommodating a circuit breaker having a plurality of diaphragms spaced apart from and arranged parallel to each other.

In practical applications, the arc may protrude from the partition plate to directly contact the case of the circuit breaker, causing the case made of thermoplastic material to melt, affecting the service life of the circuit breaker.

Furthermore, high voltages may be generated in the arc chamber and cause the internal temperature of the circuit breaker to rise.

SUMMERY OF THE UTILITY MODEL

The utility model provides an above-mentioned problem and provide an electrical protection device that is used for electrical protection device's explosion chamber and includes this explosion chamber, prevent that the casing from taking place to melt and electrical protection device destroys to in time discharge the pollutant that produces in the explosion chamber.

According to an aspect of the utility model provides an explosion chamber for electric protection device, electric protection device forms the room including the electric arc that contains static contact and moving contact, wherein forms electric arc between static contact and moving contact when static contact and moving contact are separately, electric arc form the room with the entry intercommunication of explosion chamber, the explosion chamber includes first tongue, first tongue sets up the low reaches of explosion chamber with between the export of explosion chamber and follow the first direction of perpendicular to exhaust direction is followed to the first side of explosion chamber extends to form the exhaust passage of U-shaped.

According to the above feature, by providing the first tongue between the downstream of the arc chute and the outlet, the high-temperature and high-pressure arc is prevented from directly striking the outlet of the electrical protection device, for example the housing part of the outlet, preventing the housing from melting and thus protecting the device from damage. In addition, the U-shaped exhaust passage increases creepage distance, and is helpful for the electric protection device to meet safety requirements.

In some examples, the arc chute further includes first and second walls disposed between the downstream of the arc chute and the first tongue and extending in a first direction, the first and second walls separating a first gap in the first direction such that contaminants in the exhaust gas are exhausted through the first gap.

According to the above feature, the pollutants in the arc extinguishing chamber enter the exhaust gas and can be exhausted through the gap between the separated first wall and the second wall. The discharge of contaminants is facilitated compared to a closed continuous wall.

In some examples, the first tongue extends in the first direction at least completely covering the first gap, and a length of the first tongue in the first direction is greater than a length of the first and second walls in the first direction.

According to the above feature, the first tongue completely covers at least the first gap, preventing the discharge of pollutants directly to the outlet, and the first tongue extends over a length greater than the length of the first and second walls, so that the high temperature exhaust gas contacts the first tongue first and not the housing.

In some examples, the first tongue includes a first arcuate section and a first linear section, the first linear section extending in a first direction, the first arcuate section connecting the first linear section and a housing of the device to form a smooth-transitioning exhaust passage.

In some examples, the first tongue is made of a thermoset plastic.

In some examples, the arc chute further includes a second tongue disposed between the first and second walls and the first tongue, and the second tongue extends in a second direction opposite the first direction from a second side of the arc chute opposite the first side, thereby forming an S-shaped exhaust channel.

According to the above feature, the arc extinguishing chamber further comprises a second tongue to form an S-shaped exhaust channel, thereby further increasing the creepage distance and the length of the exhaust channel, facilitating the arc extinguishing of the electrical protection device with higher operating voltage.

In some examples, the second tongue extends in a second direction at least partially covering the first gap, and a length of the second tongue in the second direction is less than a length of the first and second walls in the first direction.

In some examples, the second tongue includes a second arcuate section and a second linear section, the second linear section extending in the first direction, the second arcuate section connecting the second linear section and a housing of the device to form a smooth transition exhaust passage.

In some examples, the second tongue is made of a thermoset plastic.

In some examples, the first wall, the second wall, the first tongue, and the second tongue are molded with a housing or cover of the device.

In some examples, the arc chute further comprises a stack of baffles extending parallel to each other for arc insertion.

In some examples, the arc chute further includes an arc runner disposed at an inlet of the arc chute to direct an arc into the separator.

According to another aspect of the present invention, there is provided an electrical protection device, comprising a housing and at least one polarity unit assembled in the housing, wherein the polarity unit comprises the arc extinguish chamber as described above, and the arc extinguish chamber is disposed on one side of the electrical protection device.

According to another aspect of the present invention, there is provided a circuit breaker, including a housing and at least one polarity unit assembled in the housing, the polarity unit includes the arc extinguish chamber as described above, the arc extinguish chamber is disposed on one side of the circuit breaker.

According to above characteristic, compare in the explosion chamber of setting in the circuit breaker both sides, the utility model discloses an explosion chamber can have bigger height, guarantees certain exhaust passage length simultaneously to reduce the pressure in the explosion chamber, prevent pressure overload and help the heat dissipation.

According to the utility model discloses an explosion chamber and including the electrical protection device of this explosion chamber, because the exhaust passage of U-shaped or S-shaped, prevent electric arc direct impact casing exit, prevent that the casing from taking place to melt. In addition, the temperature and the pressure in the electric protection device can be reduced, the electric protection device is prevented from being damaged, and pollutants generated in the arc extinguish chamber can be discharged in time.

Drawings

Figure 1 shows a cross-sectional view of a first embodiment of an arc chute according to the invention;

figure 2 shows a cross-sectional view of a second embodiment of an arc chute according to the invention.

List of reference numerals

1 first tongue

2 second tongue

3 first wall

4 second wall

5 partition board

6 arc striking plate

7 static contact

8 moving contact

9 arc formation chamber

10, 10' arc extinguishing chamber

11 first arc segment

12 first straight line section

21 second arc segment

22 second straight line section

A first direction

G first gap

100 case

Detailed Description

Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the embodiments of the present invention have been illustrated in the accompanying drawings, it is to be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Those skilled in the art will recognize that alternative embodiments may be implemented within the scope of the present invention without departing from the spirit and scope of the present invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

Known circuit breakers make and break electrical circuits by bringing moving and stationary contacts in a contact arrangement into and out of contact. An arc is generated when the moving contact and the fixed contact are separated. Circuit breakers typically require an arc chute for accommodating a circuit breaker having a plurality of diaphragms spaced apart from and arranged parallel to each other. To improve arc extinguishing efficiency, the arc extinguishing chamber is also typically vented to break the arc.

In practical applications, the high temperature arc may protrude from the barrier and thus directly contact the case of the circuit breaker, causing the case made of thermoplastic material to melt, affecting the service life of the circuit breaker.

In addition, high voltage may be generated in the arc extinguishing chamber and cause an increase in the internal temperature of the circuit breaker, which may cause damage to the circuit breaker.

Furthermore, when a circuit failure, such as a short circuit, occurs, if the exhaust efficiency is low, the arc extinguishing effect is affected, thereby causing damage to the housing.

The object of the present invention is directed to a new arc chute for an electrical protection device and an electrical protection device comprising such an arc chute, which overcome the above-mentioned problems of the prior art and which have the following advantages in connection with the following description.

An arc chute 10 according to a first embodiment of the present invention will be described below with reference to fig. 1.

Fig. 1 shows a cross-sectional view of a first embodiment of an arc chute according to the invention.

According to the utility model discloses a first embodiment, explosion chamber 10 is used for electrical protection device, and electrical protection device forms room 9 including the electric arc that contains static contact 7 and moving contact 8, wherein forms electric arc between static contact 7 and moving contact 8 when static contact 7 and moving contact 8 part, and electric arc forms the entry intercommunication of room 9 and explosion chamber.

The arc chute comprises a first tongue 1, a first wall 3, a second wall, a partition 5 and an arc runner 6. The first tongue 1 is arranged between the downstream of the arc chute and the outlet of the arc chute and extends from a first side of the arc chute (the left side of the arc chute as shown in fig. 1) in a first direction a perpendicular to the exhaust direction (arrow C as shown in fig. 1) to form a U-shaped exhaust channel.

According to the above feature, by providing the first tongue 1 between the downstream of the arc chute and the outlet, the high-temperature and high-pressure arc is prevented from directly striking the outlet of the electrical protection device, for example the housing part of the outlet, preventing the housing from melting and thus protecting the device from damage. In addition, the U-shaped exhaust passage increases creepage distance, and is helpful for the electric protection device to meet safety requirements.

Through the arc extinguish chamber that sets up above, owing to only occupy shorter cross-sectional area, the height of arc extinguish chamber can set up bigger, including the exhaust passage of U-shaped, is favorable to the heat dissipation. The inventor finds through experiments that the working temperature of the arc-extinguishing chamber adopting the embodiment of the disclosure is obviously lower than that of the existing arc-extinguishing chamber which spans the whole shell and has smaller height, for example, the working temperature is reduced to about 180 ℃ from the original 220 ℃ or higher. By reducing the temperature of the arc chute, the service life of the electrical protection device can be significantly extended.

Furthermore, due to the increased height of the arc chute, the pressure in the arc chute can be reduced to about 1/2 of the existing arc chute, so that the electrical protection device is not damaged during a short circuit.

It should be noted that downstream of the arc chute of the present disclosure refers to a section of the area starting from the end of the separator 5 towards the outlet of the arc chute (e.g., as indicated by arrow C in fig. 1) and going to the outlet of the arc chute (e.g., as indicated by arrow D in fig. 1). The exhaust gas for arc extinction is discharged from the arc extinguishing chamber outlet through the downstream. In some cases, the arc protrudes beyond the baffle 5 into the downstream of the arc chute, possibly causing damage to the walls of the housing 100.

A first wall 3 and a second wall 4, the first wall 3 and the second wall 4 being arranged downstream of the arc extinguishing chamber and between the first tongue 1, and the first wall 3 and the second wall 4 extending in the first direction a, the first wall 3 and the second wall 4 being separated in the first direction a by a first gap G such that pollutants in the exhaust gases are expelled through the first gap G.

According to the above features, the pollutants in the arc extinguishing chamber 10 enter the exhaust gas and can be exhausted through the first gap G between the separated first wall 3 and second wall 4. The discharge of contaminants is facilitated compared to a closed continuous wall. Contaminants, such as metal debris, can escape through the first gap G and be prevented from accumulating on the wall surface and causing a larger arc or a longer duration arc.

As shown in fig. 1, the first tongue 1 extends in the first direction a at least completely covering the first gap G.

The length of the first tongue 1 in the first direction a is greater than the length of the first wall 3 and the second wall 4 in the first direction a.

According to the above characteristics, the first tongue 1 covers at least completely the first gap G, preventing the discharge of pollutants directly to the outlet, and the first tongue 1 extends for a length greater than the length of the first wall 3 and the second wall 4, so that the high-temperature exhaust gas contacts the first tongue 1 first and not the casing 100.

In the present embodiment, the length of the first wall 3 is smaller than the length of the second wall 4. The present disclosure is not so limited and other length arrangements will readily occur to those skilled in the art, such as a length of the first wall 3 being greater than or equal to a length of the second wall 4.

Alternatively, the first tongue 1 may comprise a first arc-shaped section 11 and a first straight section 12, the first straight section 12 extending in the first direction a, the first arc-shaped section 11 connecting the first straight section 12 and the housing of the device to form a smooth-transitioning exhaust gas channel.

Exemplarily, the first tongue 1 is made of a thermosetting plastic. Since the first tongue 1 is made of thermosetting plastic, it has good heat and corrosion resistance, can withstand the impact of high temperature arcs, and protects the housing from arc damage, since the housing is generally made of thermoplastic, which has poor heat resistance. For example, the first tongue portion 1 may be made of a thermosetting plastic such as a phenol resin, a urea resin, a melamine resin, an unsaturated polyester resin, an epoxy resin, a silicone resin, a polyurethane, or other thermosetting materials known in the art.

In the present embodiment, the separators 5 are stacked and extend parallel to each other, and a plurality of separators 5 may be included for arc insertion. The arrangement of the partition 5 may be a common arrangement in the art, and the present disclosure is not limited thereto.

An arc starting plate 6 is arranged at the inlet of the arc extinguishing chamber to introduce the arc (for example, as indicated by arrow B in fig. 1) to the partition 5. In particular, the arc ignition plate 6 may be provided in an arc shape and continuously extend from the arc formation chamber 9 to the inlet of the arc extinguishing chamber 10 to facilitate the introduction of the arc.

A second embodiment of an arc chute 10' according to the invention will be described below with reference to fig. 2.

Fig. 2 shows a cross-sectional view of a second embodiment of an arc chute 10' according to the invention.

The arc chute 10' of the second embodiment may have a similar or identical structure to the arc chute 10 of the first embodiment, such as the first tongue 1, the first wall 3, the second wall 4, the separator 5, and the arc runner 6, etc. The difference is that the arc chute 10' of the second embodiment further comprises a second tongue 2, the second tongue 2 being arranged between the first and

second walls

3, 4 and the first tongue 1, and the second tongue 2 extending in a second direction opposite to the first direction a from a second side of the arc chute, the second side (the right side of the arc chute as shown in fig. 2) being opposite to the first side, thereby forming an S-shaped exhaust channel.

The U-shaped discharge channel in the first embodiment becomes an S-shaped discharge channel due to the introduction of the second tongue 2 and ensures that the discharge channel can be formed in an S-shape due to the opposing arrangement of the first tongue 1 and the second tongue 2.

In this embodiment, the second tongue 2 may be made of a thermosetting plastic and may be made of the same thermosetting plastic as the first tongue 3.

In this embodiment, the second tongue 2 extends in the second direction at least partially covering the first gap G. Since there is a first tongue 1 that completely covers the first gap G, the second tongue 2 may only be provided to partially cover the first gap G. Alternatively, the second tongue 2 may also be arranged to completely cover the first gap G.

Preferably, the length of the first tongue 1 in the second direction is smaller than the length of the first wall 3 and the second wall 4 in the first direction a. For the second tongue portion 2, it is more advantageous to provide a shorter length than the first tongue portion 1 than to provide a length equal to or greater than the first tongue portion 1.

Exemplarily, the second tongue 2 comprises a second arc-shaped section 21 and a second straight section 22, the second straight section 22 extending along the first direction a, the second arc-shaped section 21 connecting the second straight section 22 and the housing of the device to form a smooth transition exhaust gas channel.

Optionally, the first wall 3, the second wall 4, the first tongue 1 and the second tongue 2 are moulded together with a housing or cover of the electrical protection device. Alternatively, the above components may be molded separately and mounted together by physical or mechanical engagement.

An embodiment of the utility model provides an electric protection device is still provided, including casing 100 and at least one polarity unit of assembly in the casing, the polarity unit includes as above the explosion chamber, the explosion chamber setting is in electric protection device's one side. The polarity unit may include the stationary contact 7 and the movable contact 8 as described above, connection terminals respectively connected to the stationary contact 7 and the movable contact 8, and a switching mechanism operating the movable contact 8.

In some examples, the electrical protection device may be a circuit breaker, a contactor, a contact switch, or the like. The circuit breaker may be a low voltage circuit breaker or a high voltage circuit breaker.

To sum up, according to the utility model discloses an explosion chamber and electrical protection device including this explosion chamber can prevent electric arc direct impact casing exit, prevents that the casing from taking place to melt, improves the life of contactor. In addition, the temperature and the pressure in the electric protection device can be reduced, the electric protection device is prevented from being damaged, and pollutants generated in the arc extinguish chamber can be discharged in time.

The above description is only for the specific embodiments of the present disclosure, but the scope of the embodiments of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes, substitutions or combinations within the technical scope of the embodiments of the present disclosure or under the concept of the embodiments of the present disclosure, and all of them should be covered by the scope of the embodiments of the present disclosure.

Claims

1. An arc extinguishing chamber for an electrical protection device, the electrical protection device comprising an arc formation chamber (9) containing a stationary contact (7) and a movable contact (8), wherein an arc is formed between the stationary contact (7) and the movable contact (8) when the stationary contact (7) and the movable contact (8) are separated, the arc formation chamber (9) being in communication with an inlet of the arc extinguishing chamber,

characterized in that the arc extinguishing chamber comprises a first tongue (1), the first tongue (1) being arranged between the downstream of the arc extinguishing chamber and the outlet of the arc extinguishing chamber and extending from a first side of the arc extinguishing chamber in a first direction (A) perpendicular to the exhaust direction to form a U-shaped exhaust channel.

2. An arc chamber according to claim 1, characterized in that it further comprises a first wall (3) and a second wall (4), said first wall (3) and second wall (4) being arranged downstream of the arc chamber and between said first tongue (1), and said first wall (3) and second wall (4) extending along a first direction (a), said first wall (3) and second wall (4) being separated in the first direction (a) by a first gap (G) so that the pollutants in the exhaust gases are expelled through the first gap (G).

3. Arc extinguishing chamber according to claim 2, characterized in that the first tongue (1) extends along the first direction (a) at least completely covering the first gap (G) and in that the length of the first tongue (1) along the first direction (a) is greater than the length of the first and second walls (3, 4) along the first direction (a).

4. Arc extinguishing chamber according to claim 1, characterized in that the first tongue (1) comprises a first arc-shaped section (11) and a first rectilinear section (12), the first rectilinear section (12) extending in the first direction (a), the first arc-shaped section (11) connecting the first rectilinear section (12) and the housing of the device to form a smooth-transition exhaust channel.

5. Arc extinguishing chamber according to claim 1, characterized in that said first tongue (1) is made of thermosetting plastic.

6. An arc chamber according to claim 2, characterized in that it further comprises a second tongue (2), said second tongue (2) being arranged between said first and second walls (3, 4) and said first tongue (1), and said second tongue (2) extending in a second direction opposite to said first direction (a) from a second side of said arc chamber, opposite to said first side, forming an S-shaped exhaust channel.

7. An arc extinguishing chamber according to claim 6, characterized in that the second tongue (2) extends in the second direction at least partially covering the first gap (G) and in that the length of the second tongue (2) in the second direction is smaller than the length of the first and second walls (3, 4) in the first direction (A).

8. The arc extinguishing chamber according to claim 6, characterized in that the second tongue (2) comprises a second arc-shaped section (21) and a second rectilinear section (22), the second rectilinear section (22) extending along the first direction (A), the second arc-shaped section (21) connecting the second rectilinear section (22) and the housing of the device to form a smooth-transition exhaust channel.

9. Arc extinguishing chamber according to claim 6, characterized in that said second tongue (2) is made of thermosetting plastic.

10. Arc chute according to claim 6, characterized in that said first wall (3), said second wall (4), said first tongue (1) and said second tongue (2) are moulded together with the housing or cover of the device.

11. Arc chute according to any of claims 1-10, characterized in that it further comprises a stack of separators (5) extending parallel to each other for arc insertion.

12. Arc extinguishing chamber according to claim 11, characterized in that it further comprises an arc ignition plate (6) arranged at the inlet of the chamber to introduce the arc into the partition (5).

13. An electrical protection device, characterized in that it comprises a housing and at least one polar unit fitted in the housing, said polar unit comprising an arc extinguishing chamber according to any of claims 1-12, said arc extinguishing chamber being arranged at one side of said electrical protection device.

14. The electrical protection device of claim 13, wherein the electrical protection device is a circuit breaker.