KR102641636B1 - Circuit breaker and its exhaust structure - Google Patents

Abstract

Circuit breaker and its exhaust structure. The circuit breaker includes exhaust ports 101, 102, and 103. The exhaust port is aligned with the tail of the arc extinguishing chamber 106. The exhaust space of the exhaust port overlaps the bonding devices 401 and 402 of the circuit breaker. In the case of non-bonding, the bonding device occupies exhaust space. In case of joining of the joining device, the exhaust space is emptied. The exhaust structure of the circuit breaker significantly improves the exhaust capacity by utilizing the unoccupied space of the bonding device, increasing the quantity of exhaust ports, and expanding the exhaust space. In addition, the exhaust structure is provided with a partition protrusion 104 for partitioning the electric arc, and the partition protrusion achieves the function of supporting the arc extinguishing chamber, and the arc extinguishing capacity is prevented from being reduced due to impact changes in the arc extinguishing chamber. .

Description

Circuit breaker and its exhaust structure

The present invention relates to the field of low-voltage electrical devices, and more particularly to exhaust structures for circuit breakers.

With technological advancements, the size of circuit breakers is becoming smaller and smaller, but their technical performance indicators are becoming higher and higher. Circuit breakers will generate hot expanding gases during the short-circuit breaking process. As the size of the circuit breaker is reduced, if the hot expansion gas cannot be removed in time, air currents will form, preventing the arc from effectively entering the arc extinguishing chamber. Retention of the arc will form arc backflow, causing the arc to become stagnant in the arc channel and result in severe combustion with long blocking times for the arc discharge plate and start/stop contacts.

For small circuit breakers, improvements in exhaust capacity have always been an important means of improving performance indicators. CN201796768U discloses a wiring switch device with an arc-extinguishing device, particularly an electric wiring switch device with a casing, a terminal connection chamber, and an arc-extinguishing device. The wiring switch device includes a fire extinguishing room. An arc-extinguishing plate stack having arc-extinguishing plates stacked in parallel with each other is disposed in an arc-extinguishing chamber, and the arc-extinguishing plates are kept spaced apart from each other in the stacking direction. Additionally, the exhaust stream can be discharged from the fire extinguishing chamber at a location on the exhaust side. The first flow guide wall element is arranged in the wiring switch device casing and with the aid of the first flow guide wall element the exhaust flow is guided at least partially into the terminal connection chamber. CN102243945A discloses an installed switching device comprising a housing. The housing includes an upper wide side, a lower wide side, a front side, a fixed side, a narrow side and an arc extinguishing device. The intermediate piece is arranged within the housing in such a way as to accommodate the arc extinguishing device within the partial space between the upper broad side and the intermediate piece. A first exhaust channel is formed between the upper wide side and an exhaust wall extending in a manner parallel to the wide side. The first exhaust channel directs the exhaust flow from the arc extinguishing device end directed towards the narrow side to the first exhaust gas hole in the narrow side of the housing. The end insulation is disposed between the lower wide side and the narrow side located on the exhaust gas wall of the intermediate piece. An intermediate hole is provided on the exhaust gas wall of the intermediate piece. The intermediate hole is aligned with the insulation hole in the end insulation to form a second exhaust gas channel. The second exhaust gas channel guides the first branch flow from the part between the end spatial partition and the lower wide side to the second exhaust gas hole in the narrow side wall. CN201796768U and CN102243945A improve the problem of air flow stagnation caused by turbulence of the air flow by guiding the exhaust to the air flow through the configuration of the exhaust channel, thereby increasing the exhaust capacity. However, with the continued miniaturization of circuit breakers, the space within the circuit breaker is becoming increasingly smaller, and even if the air flow can properly drain along the exhaust channel, the large gas volume and small space within the circuit breaker cause airflow stagnation. will occur and affect the outcome of SOHO.

CN203013659U discloses a circuit breaker with an arc running channel. The base and cover have a long positioning projection diameter and are arranged symmetrically. The other side of the arc extinguishing chamber, remote from the arc running channel, is adjacent to the long positioning projection diameter of the pedestal and cover. The arc section protrusion diameter is arranged symmetrically on the lower side of the long positioning protrusion diameter of the pedestal and cover. The arc section protruding diameter can be used to form a curved arc running channel, and the side walls of the pedestal and cover behind the arc section diameter are provided with arc injection ports. CN203013659U assists in extinguishing the arc by blocking the arc, but CN203013659U does not solve the problem that the air flow cannot be exhausted in time.

The present invention proposes an exhaust structure for a circuit breaker that solves the exhaust problems of small circuit breakers by expanding the exhaust space and increasing the exhaust volume.

According to one embodiment of the present invention, an exhaust structure for a circuit breaker is provided. The exhaust structure includes an exhaust port, the exhaust port is aligned with a tail of an arc extinguishing chamber, and the exhaust space of the exhaust port overlaps a wiring arrangement of the circuit breaker. When not connected to the wiring device, the wiring device occupies the exhaust space. When connected to the wiring device, the exhaust space is emptied.

According to one embodiment, three exhaust ports are provided. The three exhaust ports are formed on the housing of the circuit breaker and are respectively aligned with the top, middle and bottom of the tail of the arc extinguishing chamber. The three exhaust ports are arranged at equal intervals. The exhaust space of the exhaust port aligned with the middle portion of the tail of the fire extinguishing chamber overlaps the wiring arrangement of the circuit breaker.

According to one embodiment, the base and cover of the circuit breaker each have corresponding grooves. When the base and cover are mounted, the grooves form the three exhaust ports, with at least one exhaust port divided by the components of the circuit breaker.

According to one embodiment, the exhaust structure further includes at least one block protrusion. The block protrusion extends laterally from the tail of the fire extinguishing chamber to the location of at least one exhaust port, and extends longitudinally from one exhaust port to another adjacent exhaust port.

According to one embodiment, the block protrusion is formed on the housing of the circuit breaker. One end of the block protrusion contacts the tail of the arc extinguishing chamber and supports the arc extinguishing chamber.

According to one embodiment of the present invention, a circuit breaker is provided. At least one exhaust port is formed on the housing of the circuit breaker, and the exhaust port is aligned with the tail of the arc extinguishing chamber. The exhaust space of the exhaust port overlaps the wiring arrangement of the circuit breaker. When not connected to the wiring device, the wiring device occupies the exhaust space. When connected to the wiring device, the exhaust space is emptied.

According to one embodiment, three exhaust ports are formed on the housing of the circuit breaker. The three exhaust ports are respectively aligned with the top, middle and bottom of the tail of the fire extinguishing chamber. The three exhaust ports are arranged at equal intervals. The exhaust space of the exhaust port aligned with the middle portion of the tail of the fire extinguishing chamber overlaps the wiring arrangement of the circuit breaker.

According to one embodiment, the housing of the circuit breaker includes a base and a cover. The base and the cover each have corresponding grooves. When the base and cover are mounted, the grooves form the three exhaust ports, with at least one exhaust port divided by the components of the circuit breaker.

According to one embodiment, at least one block protrusion is formed on the housing of the circuit breaker. The block protrusion extends laterally from the tail of the fire extinguishing chamber to the location of at least one exhaust port, and extends longitudinally from one exhaust port to another adjacent exhaust port.

According to one embodiment, one end of the block protrusion contacts the tail of the arc extinguishing chamber and supports the arc extinguishing chamber.

The exhaust structure of the circuit breaker of the present invention significantly improves the exhaust capacity by utilizing the unoccupied space of the wiring harness, increasing the quantity of exhaust ports, and expanding the exhaust space. Additionally, the exhaust structure has block protrusions for blocking arcs. Additionally, the block protrusion functions as a support for the arc extinguishing chamber, avoiding a decrease in the arc extinguishing capacity due to changes in the arc extinguishing chamber caused by impact.

The features, essence and advantages of the present invention will become clear from the following description of the embodiments including the drawings.
1 is a plan view of an exhaust structure of a circuit breaker according to an embodiment of the present invention;
2 is a perspective view of an exhaust structure of a circuit breaker according to another embodiment of the present invention;
3A and 3B are diagrams showing the structure of the base and cover of a circuit breaker with an exhaust structure;
Figure 4 shows an operating state for the wiring arrangement of a circuit breaker with an exhaust structure.

The present invention discloses an exhaust structure for a circuit breaker. The exhaust structure includes an exhaust port, the exhaust port being aligned with the tail of the fire extinguishing chamber. The exhaust space of the exhaust port overlaps the wiring arrangement of the circuit breaker. When not connected to the wiring device, the wiring device occupies exhaust space. When connected to the wiring device, the exhaust space is emptied.

According to one embodiment, the exhaust structure includes at least three exhaust ports. The at least three exhaust ports are aligned with the tail of the fire extinguishing chamber, and the at least three exhaust ports are arranged at equal intervals. According to one embodiment, the exhaust structure includes three exhaust ports, and the three exhaust ports are aligned with the top, middle, and bottom of the tail of the arc extinguishing chamber, respectively. The exhaust space of the exhaust port aligned with the middle portion of the tail of the fire extinguishing chamber overlaps the wiring arrangement of the circuit breaker. The exhaust structure further includes at least one block protrusion. The block protrusion extends laterally from the tail of the fire extinguishing chamber to the location of at least one exhaust port, and extends longitudinally from one exhaust port to another adjacent exhaust port.

As shown in FIGS. 1 and 2, FIGS. 1 and 2 respectively show a plan view and a perspective view of an exhaust structure of a circuit breaker according to an embodiment of the present invention. According to the illustrated embodiment, the exhaust structure includes three exhaust ports, namely a first exhaust port 101, a second exhaust port 102, and a third exhaust port 103, and a block protrusion 104. Three exhaust ports and block protrusions are all formed on the housing of the circuit breaker. As shown in FIGS. 3A and 3B, the housing of the circuit breaker is formed by combining a base 105 and a cover 108. According to FIG. 3A, the base 105 has a first base groove 501, a second base groove 502, a third base groove 503, and a base protrusion 504. The base 105 further includes a base contact plate 507. According to FIG. 3B, the cover 108 has a first cover groove 801, a second cover groove 802, a third cover groove 803, and a cover protrusion 804. The cover 108 further includes a cover contact plate 807. The first base groove 501, the second base groove 502, the third base groove 503, the base protrusion 504, and the base contact plate 507 have a first cover groove 801, a second cover groove ( 802), the third cover groove 803, the cover protrusion 804, and the cover contact plate 807 are arranged in “one-to-one” correspondence. When the base 105 and cover 108 are mounted, the grooves and protrusions on the base and cover are the first exhaust port 101, the second exhaust port 102, the third exhaust port 103, and the block protrusion 104. ) are aligned with each other to form a Here, the second exhaust port 102 is formed directly by splicing the second base groove 502 and the second cover groove 802. The third exhaust port 103 is formed directly by splicing the third base groove 503 and the third cover groove 803. The block protrusion 104 is formed directly by splicing the base protrusion 502 and the cover protrusion 804. The second exhaust port 102, the third exhaust port 103, and the block protrusion 104 are all implemented as a single structure. The first exhaust port 101 is divided into two parts. Base contact plate 507 and cover contact plate 807 form a complete contact plate when spliced. The end surface 571 of the base contact plate 507 and the first base groove 501 form the first portion 101a of the first exhaust port. And the end surface 871 of the cover contact plate 807 and the first cover groove 801 form the second portion 101b of the first exhaust port. The first part 101a and the second part 101b form a first exhaust port 101 as shown in FIG. 2. According to the illustrated embodiment, at least one of the three exhaust ports (the first exhaust port) is divided by a component of the circuit breaker (contact plate).

Referring back to Figure 1, the first exhaust port 101 is aligned with the top of the tail of the arc extinguishing chamber 106, and the second exhaust port 102 is aligned with the middle portion of the tail of the arc extinguishing chamber 106, The third exhaust port 101 is aligned with the lower part of the tail of the arc extinguishing chamber 106. According to the embodiment shown in Figure 1, the block protrusion 104 has a zigzag shape similar to the letter "Z". The upper end 141 of the block protrusion 104 contacts the tail of the arc extinguishing chamber 106. The block protrusion 104 contacts the tail of the arc extinguishing chamber 106 and supports the arc extinguishing chamber 106. If an arc enters the extinguishing chamber 106 during the blocking process, a strong thrust will be instantly generated and act on the extinguishing chamber 106. In order to prevent the arc extinguishing chamber 106 from being biased by the thrust, the block protrusion 104 plays a role of support and positioning, thereby avoiding a decrease in the arc extinguishing capacity due to changes in the arc extinguishing chamber caused by impact. . Continuing with Figure 1, when viewed in the longitudinal direction, the position where the upper end 141 of the block protrusion 104 contacts the arc extinguishing chamber 106 is approximately in the middle of the arc extinguishing chamber 106, or at the second exhaust port. It is at the same height as (102). The position of the lower end of the block protrusion 104 is approximately at the bottom of the arc extinguishing chamber 106, or at the same height as the third exhaust port 103. When viewed laterally, the block protrusion 104 extends from the arc extinguishing chamber 106 to a position below the second exhaust port 102, from the nearest exhaust port (second exhaust port 102) to the arc extinguishing chamber 106. ) substantially covers the distance to In the case of the above-described configuration, the block protrusion 104 can efficiently block arcs and airflow. Although the block protrusion 104 shown has a zigzag shape similar to the letter “Z,” the block protrusion 104 may have a different shape. However, the shape of the block protrusion 104 satisfies the following conditions, wherein the block protrusion 104 extends laterally from the tail of the arc extinguishing chamber to the location of at least one exhaust port, and the block protrusion extends from the one exhaust port. It extends longitudinally to another adjacent exhaust port.

The distance between the first exhaust port 101, the second exhaust port 102 and the third exhaust port 103 is substantially the same, which is approximately half the height of the arc extinguishing chamber 106. The sizes of the openings of the first exhaust port 101, the second exhaust port 102, and the third exhaust port 103 are all 1.8mm-3mm, and the first exhaust port 101 and the second exhaust port 102 and the opening sizes of the third exhaust port 103 are generally not set to be the same, but may be set to be the same. Typically, only one aperture range needs to be limited. The first exhaust port 101, second exhaust port 102, and third exhaust port 103 formed on the base 105 and cover 108 increase the number of exhaust passages and also increase the volume of the exhaust space. I order it.

It should be particularly noted that the location of the second exhaust port 102 overlaps the wiring arrangement of the circuit breaker. Figure 4 shows the operating conditions for the wiring arrangement of the circuit breaker with venting structure. As shown in Fig. 4, two wiring devices of a circuit breaker are disclosed, including a first wiring device 401 on the left side and a second wiring device 402 on the right side. It should be noted that the wiring arrangement of the circuit breaker shown in Figure 4 is for the purpose of illustrating the location of the second exhaust port 102, and is not intended to be limiting for the wiring arrangement itself. The exhaust space 122 corresponding to the second exhaust port 102 overlaps the wiring device. When a wiring device such as the first wiring device 401 on the left side of FIG. 4 is not connected, the wiring device will occupy the exhaust space 122. When a wiring device such as the second wiring device 402 on the right side of FIG. 4 is connected, the wiring device is lifted upward to empty the exhaust space 122. When a circuit breaker is used, the wiring harness is inevitably lifted upwards for connection, leaving the exhaust space 122 free. Accordingly, when the circuit breaker is used, the second exhaust port 102 and the exhaust space 122 are left used, thereby increasing the exhaust space.

Although the above-described embodiment has three exhaust ports and block protrusions, a person skilled in the art can configure the number and location of exhaust ports according to actual requirements and configure or cancel block protrusions as needed. The exhaust structure proposed by the present invention mainly includes an exhaust port, which is aligned with the tail of the fire extinguishing chamber. The exhaust space of the exhaust port overlaps the wiring harness of the circuit breaker. When not connected to a wiring harness, the wiring harness takes up exhaust space. When connected to the wiring harness, the exhaust space is emptied.

Additionally, the present invention provides a circuit breaker having the exhaust structure described above. At least one exhaust port is formed on the housing of the circuit breaker, and the exhaust port is aligned with the tail of the arc extinguishing chamber. The exhaust space of the exhaust port overlaps the wiring harness of the circuit breaker. When not connected to a wiring harness, the wiring harness takes up exhaust space. When connected to the wiring harness, the exhaust space is emptied.

According to one embodiment, at least three exhaust ports are formed on the housing of the circuit breaker. At least three exhaust ports are aligned with the tail of the fire extinguishing chamber, and at least three exhaust ports are arranged at equal intervals. At least one block protrusion is formed on the housing of the circuit breaker. The block protrusion extends laterally from the tail of the fire chamber to the location of at least one exhaust port and extends longitudinally from one exhaust port to another adjacent exhaust port. It should be noted that a person skilled in the art can configure the number and location of exhaust ports and provide or cancel block protrusions according to actual requirements.

According to one embodiment, for example, in a circuit breaker having an exhaust structure as described above, three exhaust ports are formed on the housing of the circuit breaker. The three exhaust ports are aligned with the top, middle and bottom of the tail of the fire extinguishing chamber, respectively. The exhaust space of the exhaust port aligned with the middle portion of the tail of the fire extinguishing chamber overlaps the wiring arrangement of the circuit breaker. The housing of the circuit breaker includes a base and a cover. The base and cover each have corresponding grooves. When the base and cover are installed, the grooves form three exhaust ports. At least one exhaust port is shared by the circuit breaker component. For example, in a circuit breaker with an exhaust structure as described above, the first exhaust port is separated into two parts by a contact plate. One end of the block protrusion contacts the tail of the arc extinguishing chamber and supports the arc extinguishing chamber.

The exhaust structure of the circuit breaker of the present invention significantly improves the exhaust capacity by utilizing the unoccupied space of the wiring harness, increasing the quantity of exhaust ports, and expanding the exhaust space. Additionally, the exhaust structure has block protrusions for blocking arcs. Additionally, the block protrusion functions as a support for the arc extinguishing chamber, avoiding a decrease in the arc extinguishing capacity due to changes in the arc extinguishing chamber caused by impact.

The above-described embodiments are provided to those skilled in the art to implement or use the present invention under conditions in which various modifications and changes can be made by those skilled in the art without departing from the spirit and principles of the present invention, and the above-described embodiments can be modified and changed in various ways. , the scope of protection of the present invention is not limited to the above-described embodiments, but should follow the maximum scope of the innovative features described in the claims.

Claims (10)

An exhaust structure for a circuit-breaker comprising an exhaust port, comprising:
The exhaust port is aligned with the tail of the arc extinguishing chamber, the exhaust space of the exhaust port overlaps the wiring device of the circuit breaker, and when not connected to the wiring device, the wiring device is Occupying the exhaust space, when connected to the wiring device, the exhaust space is emptied,
Three exhaust ports are provided, the three exhaust ports are formed on the housing of the circuit breaker, the three exhaust ports are respectively aligned with the upper, middle and lower parts of the tail of the arc extinguishing chamber, and the three exhaust ports are formed on the housing of the circuit breaker. The exhaust ports are arranged at equal intervals, and the exhaust space of the exhaust ports aligned with the middle part of the tail of the fire extinguishing chamber overlaps the wiring device of the circuit breaker.
exhaust structure.
According to paragraph 1,
The base and cover of the circuit breaker each have corresponding grooves, and when the base and cover are mounted, the grooves form the three exhaust ports, and at least one exhaust port is connected to the component of the circuit breaker. Divided by,
exhaust structure.
According to paragraph 1,
further comprising at least one block protrusion, the block protrusion extending laterally from the tail of the fire extinguishing chamber to the location of at least one exhaust port, and extending longitudinally from one exhaust port to another adjacent exhaust port. ,
exhaust structure.
According to paragraph 3,
The block protrusion is formed on the housing of the circuit breaker, and one end of the block protrusion contacts the tail of the arc extinguishing chamber and supports the arc extinguishing chamber.
exhaust structure.
In circuit breakers,
At least one exhaust port is formed on the housing of the circuit breaker, the exhaust port is aligned with the tail of the arc extinguishing chamber, and the exhaust space of the exhaust port overlaps the wiring device of the circuit breaker and is not connected to the wiring device. When not, the wiring device occupies the exhaust space, and when connected with the wiring device, the exhaust space is emptied,
Three exhaust ports are formed on the housing of the circuit breaker, the three exhaust ports are aligned with the upper, middle, and lower parts of the tail of the arc extinguishing chamber, respectively, and the three exhaust ports are arranged at equal intervals, and The exhaust space of the exhaust port aligned with the middle portion of the tail of the fire extinguishing chamber overlaps the wiring device of the circuit breaker,
circuit breaker.
According to clause 5,
The housing of the circuit breaker includes a base and a cover, the base and the cover each having a corresponding groove, and when the base and the cover are mounted, the grooves form the three exhaust ports, and at least one The exhaust port of is divided by the components of the circuit breaker,
circuit breaker.
According to clause 5,
At least one block protrusion is formed on the housing of the circuit breaker, the block protrusion extending laterally from the tail of the arc extinguishing chamber to the location of at least one exhaust port, and extending from one exhaust port to another adjacent exhaust port. extending longitudinally,
circuit breaker.
In clause 7,
One end of the block protrusion contacts the tail of the arc extinguishing chamber and supports the arc extinguishing chamber,
circuit breaker.
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