Disconnection unit and circuit breaker comprising the same

Abstract

This disclosure provides a breaking unit for a circuit breaker, comprising: a housing having a first end wall and a second end wall arranged along the length of the housing on both sides, and a bottom wall located at the bottom of the housing; a first arc-extinguishing chamber disposed within the housing and located on one side of the first end wall; and a first airflow channel formed above the bottom wall of the housing and communicating with the first arc-extinguishing chamber. The housing has a first exhaust port disposed on one side of the second end wall, the first exhaust port communicating with the first airflow channel. This disclosure also provides a circuit breaker including the aforementioned breaking unit. This disclosure eliminates the enclosed space of the circuit breaker, allowing a large amount of gas generated during the arc extinguishing process to be directly discharged from the first airflow channel of the breaking unit without impacting the circuit breaker housing, thus avoiding problems such as housing deformation and breakage.

Description

Technical Field

[0001] This disclosure relates to a disconnection unit and a circuit breaker including the disconnection unit. Background Technology

[0002] Circuit breakers are commonly used in various electrical equipment. A circuit breaker typically comprises several breaking units, and each breaking unit is equipped with an exhaust channel connected to an arc-extinguishing chamber, which in turn connects to an exhaust port. During the arc-extinguishing process, the high-pressure, high-temperature gas in the arc-extinguishing chamber can be discharged through the exhaust port, preventing excessive pressure within the arc-extinguishing chamber from damaging the breaking unit or even the entire circuit breaker.

[0003] On the other hand, with the continuous increase in DC application voltage levels, the breaking capacity requirements of circuit breakers are also increasing. While energy demands are rising, there is also a desire for circuit breakers to be as small as possible. This places higher demands on the circuit breaker enclosure. Therefore, designing circuit breakers that meet multiple requirements within a limited space has become a challenge in this field. Utility Model Content

[0004] In response to the problems and needs mentioned above, this disclosure proposes a novel technical solution that solves the aforementioned problems and brings about other technical effects by adopting the following technical features.

[0005] This disclosure provides a breaking unit for a circuit breaker, comprising: a housing having a first end wall and a second end wall arranged along the length of the housing on both sides, and a bottom wall located at the bottom of the housing; a first arc-extinguishing chamber disposed within the housing and located on one side of the first end wall; and a first airflow channel formed above the bottom wall of the housing and connected to the first arc-extinguishing chamber; wherein the housing has a first exhaust port disposed on one side of the second end wall, the first exhaust port being connected to the first airflow channel.

[0006] Preferably, the bottom wall of the housing has a flat inner surface.

[0007] Preferably, the bottom wall of the housing has one or more protrusions formed on the flat inner surface.

[0008] Preferably, along the height direction of the housing, the first exhaust port has an opening height, and the maximum height of the one or more protrusions is less than or equal to 1 / 3 of the opening height.

[0009] Preferably, it further includes: a second arc-extinguishing chamber disposed within the housing and located inside the second end wall; a second airflow channel formed between the second end wall and the second arc-extinguishing chamber and connected to the second arc-extinguishing chamber, wherein the housing has a second exhaust port passing through the second end wall and connected to the second airflow channel.

[0010] This disclosure also provides a circuit breaker including the breaking unit as described above.

[0011] Preferably, the circuit breaker further includes a housing for accommodating the breaking unit, and the housing has a bottom opening through which the bottom wall of the housing of the breaking unit is exposed.

[0012] Preferably, the bottom wall of the housing of the splitting unit is flush with the edge of the bottom opening.

[0013] Preferably, the circuit breaker housing further includes a side plate, which has a gap with the side wall of the breaking unit, and the gap communicates with the bottom opening.

[0014] Preferably, the circuit breaker housing further includes one or more outlets communicating with a first vent port of the disconnecting unit housing.

[0015] The circuit breaker unit of this disclosure forms a first airflow channel inside its housing, with the bottom wall of the housing serving as the outermost boundary of the first airflow channel. The circuit breaker housing including this circuit breaker unit also includes a bottom opening, exposing the bottom wall of the circuit breaker unit and thus eliminating the enclosed space of the circuit breaker. The large amount of gas generated during arc extinguishing can be directly discharged from the first airflow channel of the circuit breaker unit without impacting the circuit breaker housing, avoiding housing deformation and cracking. Furthermore, the circuit breaker housing of this disclosure is flush with the bottom edge of the circuit breaker housing, reducing the overall size of the circuit breaker and meeting miniaturization requirements. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a circuit breaker according to a preferred embodiment of the present disclosure;

[0017] Figure 2 This is a cross-sectional view of the segmentation unit according to a preferred embodiment of the present disclosure;

[0018] Figure 3 This is another schematic diagram of a circuit breaker according to a preferred embodiment of the present disclosure;

[0019] Figure 4 From Figure 3 A schematic diagram after the circuit breaker side plate has been removed;

[0020] Figure 5 This is a schematic diagram of a circuit breaker and its disconnection unit. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0022] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this disclosure may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0023] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by those skilled in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Where the number of components is not specified, the number of components may be one or more; similarly, terms such as “a,” “the,” and “described” do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “install,” “set,” “connect,” or “link” are not limited to physical or mechanical installation, setting, or connection, but may include electrical installation, setting, or connection, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate the relative positional relationship of the equipment during use or as shown in the accompanying drawings; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] In such Figure 5 The circuit breaker shown includes two breaking units 8 assembled in the circuit breaker housing 81. Each breaking unit 8 has an open airflow channel 80 located at its bottom. Simultaneously, the bottom wall 811 of the circuit breaker housing 81 closes the airflow channel 80, allowing gas in the airflow channel 80 to be discharged through two exhaust ports 812 on the circuit breaker housing 81. However, during the use of this type of circuit breaker, serious problems such as deformation and rupture of the circuit breaker housing due to excessive gas pressure in the arc-extinguishing chamber frequently occur.

[0025] In view of this, the present disclosure provides a disconnection unit 1 and a circuit breaker 9 including the disconnection unit 1. See also Figure 1 According to a preferred embodiment of the present disclosure, the circuit breaker 9 may include two identical breaking units 1, and one of the breaking units will be described in detail below.

[0026] Additionally, for ease of description, Figure 1 In this context, the X direction corresponds to the length direction of the circuit breaker / breaking unit, the Y direction corresponds to the height direction of the circuit breaker / breaking unit, and the Z direction corresponds to the thickness direction of the circuit breaker / breaking unit.

[0027] See further Figure 2 According to this preferred embodiment, the breaking unit 1 includes: a housing 10, having a first end wall 11 and a second end wall 12 arranged along the length of the housing 10 on both sides of the housing 10, and a bottom wall 13 located at the bottom of the housing 10. It should be understood that the housing 10 also includes a top wall, side walls, etc., to protect various components (such as moving and stationary contacts, rotating shafts, etc.) inside the breaking unit 1.

[0028] The interruption unit 1 further includes: a first arc-extinguishing chamber 21 disposed within the housing 10 and located on one side of the first end wall 11; and a first airflow channel 31 formed above the bottom wall 13 of the housing 10 and connected to the first arc-extinguishing chamber 21. The housing 10 has a first exhaust port 14 disposed on one side of the second end wall 12, which connects to the first airflow channel 31. For example, the first exhaust port 14 may be located below the second end wall 12 at the corner between the second end wall 12 and the bottom wall 13, as shown in the figure. Alternatively, according to an embodiment not shown, the first exhaust port may be an opening provided on the second end wall 12 near the corner.

[0029] The segmentation unit structure disclosed herein is similar to Figure 5 The difference is that in this method, the airflow channel 80 is defined by the circuit breaker housing 81. Therefore, the high-temperature and high-pressure gas generated in the first arc-extinguishing chamber 21 will impact the bottom wall of the circuit breaker housing 81 where it connects with the breaking unit, potentially causing deformation or even damage to the housing 81 at that location. Furthermore, due to... Figure 5 The circuit breaker housing 81 shown forms a relatively enclosed space, so the high-temperature, high-pressure gas leaking from the holes on the side 83 of the disconnecting unit is difficult to escape, and thus will impact the housing and the middle cover, causing deformation and damage to other parts of the circuit breaker.

[0030] The structure of the breaking unit disclosed herein solves the above-mentioned problems. In this disclosure, the high-temperature and high-pressure gas generated by the first arc-extinguishing chamber 21 can smoothly flow out of the breaking unit 1 from the first exhaust port 14 through the first airflow channel 31 with the bottom wall 13 of the housing 10 as the outermost boundary, thereby avoiding the high-temperature and high-pressure gas in the first arc-extinguishing chamber 21 from directly impacting the housing 90 of the circuit breaker 9.

[0031] Preferably, the bottom wall 13 of the housing 10 has a flat inner surface. More preferably, the bottom wall 13 of the housing 10 has one or more protrusions 15 formed on the flat inner surface. Figure 2 An example of a protrusion 15 is shown. By setting multiple protrusions 15 in the first airflow channel 31, the first airflow channel 31 can form a meandering path, which is beneficial for blocking charged particles in the high-temperature and high-pressure gas to a certain extent, and can also allow the high-temperature and high-pressure gas to be fully cooled and depressurized.

[0032] Preferably, along the height direction Y of the housing, the first exhaust port 14 has an opening height (not specifically shown), while the maximum height of one or more protrusions 15 is less than or equal to 1 / 3 of the opening height. This arrangement ensures that the protrusions 15 are not too high, thus not obstructing the smooth discharge of gas.

[0033] In addition, such as Figure 2 As shown, the disconnecting unit 1 also includes a second arc-extinguishing chamber 22, disposed within the housing 10 and located inside the second end wall 12. Moving and stationary contacts, a rotating shaft, etc. (not labeled) are disposed between the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22. A second airflow channel 32 is formed between the second end wall 12 and the second arc-extinguishing chamber 22 and communicates with the second arc-extinguishing chamber 22. The housing 10 has a second exhaust port 42 that passes through the second end wall 12 and communicates with the second airflow channel 32.

[0034] As previously stated, this disclosure also provides a circuit breaker 9, which includes the aforementioned breaking unit 1, for example, two identical breaking units 1.

[0035] See further Figure 1 , 3 In addition to 4, the circuit breaker 9 also includes a housing 90 for accommodating the disconnecting unit 1, and the housing 90 has a bottom opening 91 through which the bottom wall 13 of the housing 10 of the disconnecting unit 1 is exposed.

[0036] Since the housing of the disconnecting unit according to this disclosure already includes the first airflow channel as described above, it is not necessary to provide a bottom seal through the circuit breaker housing, which also avoids the formation of a closed space in the circuit breaker. Moreover, when the housing of the disconnecting unit is formed by joining two halves of the housing, if some of the gas generated during arc extinguishing leaks from the bottom gap where the two halves of the housing join due to excessive pressure, the leaked gas can also be discharged through the bottom opening of the circuit breaker housing, instead of being trapped inside the housing.

[0037] More preferably, since the bottom of the circuit breaker housing no longer has a bottom wall forming an enclosed space, the bottom wall 13 of the housing 10 of the breaking unit 1 can be flush with the edge of the bottom opening 91. In this way, the overall size of the circuit breaker can be further reduced, meeting the miniaturization requirements without sacrificing circuit breaker performance.

[0038] More preferably, such as Figure 3 As shown, the housing 90 of the circuit breaker 9 also includes a side plate 92. Figure 4 The diagram shows the side plate 92 removed from the housing 90, and the side wall 16 of the disconnecting unit 1 is shown. According to this disclosure, a gap exists between the side plate 92 and the side wall 16, and this gap communicates with the bottom opening 91. Thus, when gas generated during arc extinguishing leaks from some holes (e.g., hole 17) in the side wall 16, the leaked gas can also be discharged through this gap from the bottom opening 19 of the housing 90, which also prevents the leaked gas from impacting the side plate 92.

[0039] See further Figure 3 and Figure 4 The housing 90 of the circuit breaker 9 also includes one or more outlets 93 communicating with the first vent 14 of the housing 90 of the disconnecting unit 1. The outlets 93 may be arranged, for example, such that gas from the first vent 14 is discharged in a direction perpendicular to the second end wall 12 of the disconnecting unit 1.

[0040] The exemplary embodiments of this disclosure have been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A disconnecting unit (1) for a circuit breaker (9), characterized in that, include The housing (10) has a first end wall (11) and a second end wall (12) arranged along the length of the housing (10) on both sides, and a bottom wall (13) located at the bottom of the housing (10). The first arc-extinguishing chamber (21) is disposed inside the housing (10) and located on one side of the first end wall (11); The first airflow channel (31) is formed above the bottom wall (13) of the housing (10) and is connected to the first arc-extinguishing chamber (21). The housing (10) has a first exhaust port (14) disposed on one side of the second end wall (12), which is connected to the first airflow channel (31).

2. The segmentation unit (1) as described in claim 1, characterized in that, The bottom wall (13) of the housing (10) has a flat inner surface.

3. The segmentation unit (1) as described in claim 2, characterized in that, The bottom wall (13) of the housing (10) has one or more protrusions (15) formed on the flat inner surface.

4. The segmentation unit (1) as described in claim 3, characterized in that, Along the height direction of the housing, the first exhaust port (14) has an opening height, and the maximum height of the one or more protrusions (15) is less than or equal to 1 / 3 of the opening height.

5. The segmentation unit (1) as described in any one of claims 1-4, characterized in that, Also includes: The second arc-extinguishing chamber (22) is disposed inside the housing (10) and located inside the second end wall (12); The second airflow channel (32) is formed between the second end wall (12) and the second arc-extinguishing chamber (22) and is connected to the second arc-extinguishing chamber (22) shown. The housing (10) has a second exhaust port (42) that passes through the second end wall (12) and communicates with the second airflow channel (32).

6. A circuit breaker (9), characterized in that, Includes the segmentation unit (1) as described in any one of claims 1-5.

7. The circuit breaker (9) as described in claim 6, characterized in that, Includes a housing (90) for accommodating the splitting unit (1), and the housing (90) has a bottom opening (91) through which the bottom wall (13) of the housing (10) of the splitting unit (1) is exposed.

8. The circuit breaker (9) as described in claim 7, characterized in that, The bottom wall (13) of the housing (10) of the splitting unit (1) is flush with the edge of the bottom opening (91).

9. The circuit breaker (9) as claimed in claim 7, characterized in that, The housing (90) of the circuit breaker (9) also includes a side plate (92) having a gap between the side plate (92) and the side wall (16) of the disconnecting unit (1), the gap communicating with the bottom opening (91).

10. The circuit breaker (9) as claimed in claim 7, characterized in that, The casing (90) of the circuit breaker (9) also includes one or more outlets (93) communicating with the first vent (14) of the casing (90) of the disconnecting unit (1).

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