RU2702341C1 - Automatic circuit breaker and pumping device for it - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to low-voltage electrical equipment, in particular to automatic circuit breaker. Automatic circuit breaker comprises at least one outlet hole made in automatic circuit breaker housing and aligned with arc-quenching chamber tail section, at that, discharge outlet space can be shut off by switching device, at that, when switching device is not connected, it occupies outlet space, and when switching device is connected, outlet space is released. In housing of automatic circuit breaker there can be made three outlets leveled with top, middle and bottom of tail part of arc-quenching chamber, respectively, wherein outlet holes are located with equal intervals, and outlet space of outlet hole is aligned with tail part of arc-extinguishing chamber and is made with possibility of overlapping switching device, wherein the breaker housing can have a base and a cover, which are provided with corresponding longitudinal slots, wherein when the base and the cover are installed, the longitudinal slots form three outlet holes, and at least one of them is separated by the breaker parts.

EFFECT: provision of air outlet from automatic circuit breaker.

5 cl, 5 dwg

Description

Technical field

The present invention relates to the field of low-voltage electrical equipment and, in particular, to a circuit breaker.

State of the art

With the development of technology, the size of circuit breakers is reduced, but their performance is becoming higher. Automatic circuit breakers during the short circuit shutdown process generate expanding high temperature gases. Since the size of the circuit breaker is reduced, if the high-temperature expanding gas is not removed in time, an air flow will form, which will prevent the effective penetration of the arc into the extinguishing chamber. The delay of the arc will lead to a backward flow along the arc, the arc will begin to stagnate in the arc channel and, ultimately, this will lead to a long shutdown time, a strong burning of the arcing plate and moving / static contacts.

For small circuit breakers, increasing the gas discharge potential has always been an important means of improving performance. CN 201796768 U discloses a device for switching wires with an arcing device, in particular, a switching device for electrical wiring, provided with a housing, a terminal connecting chamber and an arcing device. The wiring switching device includes an arcing chamber. The node of the extinguishing plates with parallel extinguishing plates located in the arcing chamber, where the plates are kept at a distance from each other in the laying direction. The effluent can also exit the extinguishing chamber at points located on transverse surfaces. The first element of the flow guide wall is located inside the housing of the wiring switching device, and at least a portion of the effluent is directed to the terminal junction chamber using the first element of the flow guide wall.

CN 102243945 A discloses a wiring device including a housing comprising an upper wide side, a lower wide side, a front side, a fixed side, a narrow side and an arcing device. An intermediate element is located inside the casing, which ensures the placement of the arcing device in a part of the space between the upper wide side and the intermediate element. A first exhaust channel is formed between the exhaust wall extending parallel to the wide side and the upper wide side. The first exhaust channel directs the effluent from the end of the extinguishing device to the narrow side into the first exhaust gas opening in the narrow side wall of the housing. An end insulating element is located between the narrow side portion located on the gas outlet wall of the intermediate element and the lower wide side. An intermediate hole is provided in the gas outlet wall of the intermediate element. The intermediate hole is aligned with the hole inside the end of the insulating element, thus forming a second outlet channel. The second outlet channel directs the first branch flow from the part between the end spatial partition and the lower wide side to the second gas outlet in the narrow side wall.

According to patent applications CN 201796768 U and CN 102243945 A, the exhaust air is directed through the exhaust duct device in order to solve the problem of stagnation of the air flow caused by its turbulence, thereby increasing the gas discharge potential. However, with the continuous miniaturization of the circuit breakers, the space in the circuit breaker becomes smaller and smaller, and even if the air flow can properly flow through the outlet, air stagnation will still occur due to the large volume of gas and the small space in the circuit breaker, which ultimately affect the result of the extinguishing.

CN 203013659 U discloses an automatic chopper equipped with an arc flow channel. The base and cover are provided with long protruding positioning diameters located symmetrically. The other side of the arcing chamber, which is located far from the arc flow channel, is adjacent to the long protruding positioning diameters of the base and cover. The protruding arc separation diameters are symmetrically located on the lower sides of the long protruding positioning diameters of the base and cover. The protruding diameters dividing the arcs are used to form a curved arc flow channel, and the side walls of the base and the cover behind the arc-separating diameters are provided with openings for arc spraying. In the circuit breaker according to patent application CN 203013659 U, the arc cut-off contributes to the extinction, but the problem of the impossibility of timely withdrawal of the air flow is still not resolved.

SUMMARY OF THE INVENTION The invention is a pumping device (plug) for an automatic interrupter that solves the problem of discharging air from a miniature automatic interrupter by expanding the outlet space and increasing the volume of exhaust air.

The evacuation device of the circuit breaker contains an outlet that is aligned with the tail of the arcing chamber, an outlet space of the outlet that is configured to overlap the circuit breaker by the switching device, and when the switching device is not connected, it occupies the outlet space, and when the switching device is connected, the exhaust space is freed .

Three outlet openings aligned with the top, middle, and bottom of the tail end of the arcing chamber can be made in the case of the automatic chopper, respectively, whereby the outlet openings are spaced at equal intervals and the outlet space of the outlet is aligned with the middle of the tail end of the arcing chamber and can be overlapped circuit breaker circuit breaker.

The base and cover of the housing can be provided with corresponding longitudinal grooves, and when the base and cover are installed, the longitudinal grooves form three outlet openings, at least one of which is separated by parts of the circuit breaker.

The pumping device may further include at least one modular protrusion, transversely extending from the rear of the arcing chamber to the location of at least one outlet, and in the longitudinal direction extending from one outlet to another. In this case, the modular protrusion can be located on the case of the automatic chopper, and one end of the modular protrusion is made with the possibility of contact with the tail of the arcing chamber and maintaining the arcing chamber.

The invention is also an automatic chopper containing at least one outlet made in the case of the circuit breaker and aligned with the tail of the arcing chamber, and the outlet space of the outlet is made with the possibility of overlapping by the switching device of the automatic chopper, while when the switching device not connected, it occupies the exhaust space, and when the switching device is connected, the exhaust space svobozhdaetsya.

Three outlet openings aligned with the top, middle, and bottom of the tail end of the arcing chamber can be made in the case of the automatic chopper, respectively, whereby the outlet openings are spaced at equal intervals and the outlet space of the outlet is aligned with the middle of the tail end of the arcing chamber and can be overlapped circuit breaker circuit breaker. Moreover, the case of the circuit breaker may contain a base and a cover that are provided with corresponding longitudinal grooves, and when the base and the cover are installed, the longitudinal grooves form three outlet openings, at least one of them is separated by the details of the automatic breaker.

At least one modular protrusion extending laterally from the tail of the arcing chamber to the location of at least one outlet can be placed on the circuit breaker body and extending longitudinally from one outlet to another. Moreover, one end of the modular protrusion can be made with the possibility of contact with the tail of the arcing chamber and maintaining the arcing chamber.

The circuit breaker evacuation device according to the present invention uses the unallocated space of the switching device, increases the number of outlet openings, expands the outlet space, thereby significantly increasing the gas discharge potential. The pumping device is also provided with a modular protrusion for cutting off the arc. The modular protrusion also serves as a support for the arcing chamber, thereby avoiding a reduction in the arcing potential due to displacement of the arcing chamber caused by the shock.

Brief Description of the Drawings Specific features and advantages of the invention are set forth below with reference to the drawings, in which:

- in FIG. 1 - pumping device of an automatic chopper, plan view;

- in FIG. 2 - pumping device of an automatic chopper, perspective view;

- in FIG. 3a and 3b show the design of the base and cover of the circuit breaker with a pumping device;

- in FIG. 4 - switching device of an automatic chopper with a pumping device in working condition.

A specific embodiment of the invention The present invention discloses a pumping device (ram) for a circuit breaker. The pumping device has an outlet aligned with the tail of the arcing chamber. The outlet space of the outlet is blocked by the switching device of the circuit breaker. When the switching device is not connected, it occupies the outlet space. When the switching device is connected, the exhaust space is freed.

In a specific embodiment, the evacuation device comprises three outlet openings aligned with the tail of the arcing chamber and spaced at equal intervals. In particular, the pumping device has three outlet openings that are aligned with the top, middle and bottom of the tail of the arcing chamber, respectively. The outlet space of the outlet, aligned with the middle of the tail of the arcing chamber, is blocked by the switching device of the circuit breaker. The pumping device further comprises at least one modular protrusion. A modular protrusion, which in the transverse direction extends from the rear of the arcing chamber to the location of at least one outlet, and in the longitudinal direction passes from one outlet to another (neighboring).

In FIG. 1 and FIG. 2 shows the projection of the pumping device of an automatic chopper in plan and perspective. The pumping device has three outlet openings: a first outlet 101, a second outlet 102 and a third outlet 103, as well as a modular protrusion 104. Three outlet and a modular protrusion are located on the breaker body. As shown in FIG. 3a and 3b, the circuit breaker housing is formed by connecting the base 105 and the cover 108. Referring to FIG. 3a, the base 105 has a first longitudinal groove 501, a second longitudinal groove 502, a third longitudinal groove 503 and a protrusion 504 of the base. The base 105 is further provided with a contact plate 507. Referring to FIG. 3b, the cover 108 has a first longitudinal groove 801, a second longitudinal groove 802, a third longitudinal groove 803 and a protrusion 804. The cover 108 is further provided with a contact plate 807. The first longitudinal groove 501, the second longitudinal groove 502 of the base, the third longitudinal groove 503 of the base, the base protrusion 504 and the base contact plate 507 are in “one-to-one” correspondence with the first longitudinal cover groove 801, the second longitudinal cover groove 802, the third longitudinal cover groove 803, the cover protrusion 804 and the cover contact plate 807. When the base 105 and the lid 108 are installed, the longitudinal grooves and protrusions on the base and the lid are aligned with each other, forming a first outlet 101, a second outlet 102, a third outlet 103 and a modular protrusion 104. In this case, the second outlet 102 is formed by aligning a second longitudinal base groove 502 and a second longitudinal cover groove 802. A third outlet 103 is formed by aligning the third longitudinal groove 503 of the base and the third longitudinal groove 803 of the lid. The modular protrusion 104 is made directly by combining the protrusion 502 of the base and the protrusion 804 of the cover above it. The second outlet 102, the third outlet 103 and the modular protrusion 104 are made in a single design. The first outlet 101 is divided into two parts. The base contact plate 507 and the cover contact plate 807, when combined, form a continuous contact plate. The end surface 571 of the base contact plate 507 and the first longitudinal base groove 501 form the first part 101a of the first outlet 101. And the end surface 871 of the base contact plate 807 and the first longitudinal cap groove 801 form the second part 101b of the first outlet 101. The first part 101a and the second part 101b forms a first outlet 101, as shown in FIG. 2. According to the illustrated embodiment, at least one outlet (for example, the first outlet) of the three is separated by a contact plate of the circuit breaker.

Returning to FIG. 1, the first outlet 101 is aligned with the top of the tail of the arcing chamber 106, the second outlet 102 is aligned with the middle of the tail of the arcing chamber 106, and the third outlet 103 is aligned with the bottom of the tail of the arcing chamber 106. According to the embodiment shown in FIG. 1, the modular protrusion 104 has a zigzag shape that resembles the letter “Z”. The upper edge 141 of the modular protrusion 104 is in contact with the tail of the arcing chamber 106. The modular protrusion 104 is in contact with the tail of the arcing chamber 106 to support it. When the arc enters the arcing chamber 106 during the shutdown process, a powerful traction is instantly generated that acts on the arcing chamber 106. To prevent the arcing chamber 106 from displacing under the influence of the traction, the modular protrusion 104 performs support and positioning functions to avoid a decrease in the arcing potential due to displacement of the arcing chamber 106 caused by the shock. Further, as shown in FIG. 1, when viewed in the longitudinal direction, the position in which the upper edge 141 of the modular protrusion 104 is in contact with the arcing chamber 106 is located approximately in the middle of the arcing chamber 106 or at the same height as the second outlet opening 102. The position of the lower the edges of the modular protrusion 104 are approximately at the bottom of the arcing chamber 106 or at the same height as the third outlet 103. When viewed from the side, the modular protrusion 104 extends from the arcing chamber 106 to a position below the second outlet by means of 102, essentially covering the distance from the nearest outlet (second outlet 102) to the arcing chamber 106. In the device described above, the modular protrusion 104 can effectively cut off the arcs and air flow. Although the illustrated modular protrusion 104 has a zigzag shape resembling the letter “Z”, it should be noted that the modular protrusion 104 may have other shapes. However, the shape of the modular protrusion 104 must satisfy the following conditions: the modular protrusion 104 extends in the transverse direction from the rear of the arcing chamber 106 to the location of at least one outlet in the transverse direction and extends from one outlet to another (adjacent) in the longitudinal direction.

The distance between the first outlet 101, the second outlet 102 and the third outlet 103 is substantially equal to about half the height of the arcing chamber 106. The dimensions of the openings of the first outlet 101, the second outlet 102 and the third outlet 103 are the range between 1.8 mm and 3 mm, as well as the first outlet 101, the second outlet 102 and the third row. The opening size of the air channel 103, as a rule, should not be the same, but may be the same. Generally, only one opening range should be limited. The first outlet 101, the second outlet 102 and the third outlet 103, made in the base 105 and the cover 108, increase the number of outlet channels, as well as increase the volume of the outlet space.

It should be especially noted that the position in which the second outlet 102 is located is overlapped by the switching device of the circuit breaker. In FIG. 4 shows the operational status of the switching device of the circuit breaker with a pumping device. As shown in FIG. 4, two circuit breaker switching devices are disclosed, including a first switching device 401 on the left and a second switching device 402 on the right. It should be noted that the circuit breaker switching device shown in FIG. 4 is shown to illustrate the position of the second outlet 102; it is not intended to limit the switching device itself. The outlet space 122 corresponding to the second outlet 102 is blocked by a switching device. When the switching device is not connected, such as, for example, the first switching device 401 on the left side in FIG. 4, it occupies an outlet space 122. When the switching device is connected, such as, for example, the second switching device 402 on the right side in FIG. 4, it is locked in a raised position to free the outlet space 122. During operation of the circuit breaker, the switching device inevitably rises to provide a connection, leaving the outlet space 122 free. Thus, during operation of the circuit breaker, a second outlet channel 102 and an outlet space 122 can be activated to thereby increase the outlet space.

It should be noted that although the embodiments described above have three outlets and a modular protrusion, those skilled in the art can change the number and arrangement of the outlet openings in accordance with actual requirements, as well as change the configuration or exclude the modular protrusion from the design if necessary. The pumping device of the present invention has an outlet aligned with the tail of the arcing chamber. The outlet space of the outlet is blocked by the switching device of the circuit breaker. When the switching device is not connected, it occupies the outlet space. When the switching device is connected, the exhaust space is freed.

The present invention also discloses an automatic chopper with the aforementioned pumping device. At least one outlet is made on the interrupter housing, aligned with the tail of the arcing chamber. The outlet space of the outlet is blocked by the switching device of the circuit breaker. When the switching device is not connected, it occupies the outlet space. When the switching device is connected, the exhaust space is freed.

According to one embodiment, at least three outlet openings are provided in the circuit breaker housing. At least three outlet openings are aligned with the tail of the arcing chamber and are spaced at equal intervals. At least one modular protrusion is provided on the circuit breaker body. The modular protrusion extends in the transverse direction from the rear of the arcing chamber to the location of at least one outlet, and in the longitudinal direction from one outlet to another (neighboring). It should be noted that those skilled in the art can change the number and location of exhaust openings in accordance with the actual requirements, as well as change the configuration of the modular protrusion or exclude it from the design if necessary.

According to an embodiment, for example, in a circuit breaker with a pumping device illustrated above, three discharge openings are provided in a circuit breaker body. Three outlets are aligned with the top, middle and bottom of the tail of the arcing chamber, respectively. The outlet space of the outlet, aligned with the midpoint of the tail of the arcing chamber, is blocked by the switching device of the circuit breaker. The circuit breaker case has a base and a cover. The base and cover are provided with corresponding longitudinal grooves. When the base and cover are installed, the longitudinal grooves form three outlets. At least one outlet is separated by circuit breaker parts. For example, in a circuit breaker with an exhaust structure illustrated above, the first outlet is divided into two parts by a contact plate. One end of the modular protrusion contacts the tail of the arcing chamber and supports the arcing chamber.

The circuit breaker evacuation device according to the present invention uses the unallocated space of the switching device, increases the number of outlet openings, expands the outlet space, thereby significantly increasing the gas discharge potential. The pumping device is also provided with a modular protrusion for cutting off the arc. The modular protrusion also serves as a support for the arcing chamber, thereby avoiding a reduction in the arcing potential due to displacement of the arcing chamber caused by the shock.

The above embodiments are presented to those skilled in the art for implementing or using the invention, provided that various modifications or changes are made by those skilled in the art without departing from the spirit and principle of the invention; The above embodiments may be modified and modified in various ways, therefore, the scope of legal protection of the present invention is not limited to the above embodiments and should correspond to the maximum amount of innovative features mentioned in the claims.

Claims (5)

1. Automatic chopper containing at least one outlet made in the case of the circuit breaker and aligned with the tail of the arcing chamber, and the outlet space of the outlet is configured to overlap the switching device of the circuit breaker, while when the switching device is not connected, it takes exhaust space, and when the switching device is connected, the exhaust space is freed. 2. The automatic chopper according to claim 1, characterized in that in the case of the automatic chopper there are three outlet openings aligned with the top, middle and bottom of the tail of the arcing chamber, respectively, the outlet openings being spaced at equal intervals and the outlet space of the outlet aligned with the middle of the tail of the arcing chamber and is configured to overlap the switching device of the automatic chopper. 3. The circuit breaker according to claim 2, characterized in that the case of the circuit breaker comprises a base and a cover that are provided with corresponding longitudinal grooves, and when the base and the cover are installed, the longitudinal grooves form three outlet openings, at least one of which is divided circuit breaker parts. 4. The automatic chopper according to claim 1, characterized in that at least one modular protrusion is placed on the case of the automatic chopper, transversely extending from the rear of the arcing chamber to the location of at least one outlet and extending longitudinally from one outlet to another. 5. Automatic breaker according to claim 4, characterized in that one end of the modular protrusion is made with the possibility of contact with the tail of the arcing chamber and maintaining the arcing chamber.

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