Shell of molded case circuit breaker and molded case circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliances, in particular to a shell of a molded case circuit breaker and the molded case circuit breaker. The shell comprises an arc extinguish chamber mounting base, the arc extinguish chamber mounting base comprises a mounting part and a flow guide part, and the mounting part is provided with a plurality of first mounting cavities for mounting arc extinguish chambers of the molded case circuit breaker; the flow guide part is provided with a plurality of flow guide channels, the flow guide channels are in one-to-one correspondence with the first installation cavities and are communicated with the first installation cavities, inlets of the flow guide channels are arranged opposite to the exhaust ports of the corresponding arc extinguish chambers, and outlets of the flow guide channels are communicated with the air outlet of the shell. According to the shell, the diversion channel is arranged between the exhaust port of the arc extinguish chamber and the air outlet of the shell, on one hand, gas exhausted from the arc extinguish chamber can be collected and guided, and the gas can be smoothly exhausted from the shell along the diversion channel; on the other hand, due to the arrangement of the flow guide channel, the gas cooling time is prolonged, and the impact force of the gas on the shell is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a housing of a molded case circuit breaker and a molded case circuit breaker. Background Art

[0002] During the breaking process of the circuit breaker, the voltage between the moving and static contacts will cause air medium discharge to form an arc. Only relying on the arc extinguishing chamber inside the circuit breaker cannot completely extinguish the arc, and the remaining arc and charged particles will be ejected outward from the air outlet on the housing of the circuit breaker along with the air flow.

[0003] In the existing molded case circuit breakers, the air outlet on the housing is usually adjacent to the back of the arc extinguishing chamber (i.e., the exhaust end of the arc extinguishing chamber), and the opening area of the air outlet of the housing is limited by structures such as wiring terminals and cannot completely cover the exhaust port of the arc extinguishing chamber. This leads to the difficulty for the gas discharged from the arc extinguishing chamber to smoothly discharge outward from the air outlet of the housing, and the gas that cannot be discharged in time impacts the housing, which may seriously cause the problem of the housing cracking. Summary of the Utility Model

[0004] The first object of the utility model is to provide a housing of a molded case circuit breaker to solve the technical problem in the prior art that the gas discharged from the arc extinguishing chamber is difficult to smoothly discharge outward from the air outlet of the housing, and the gas that cannot be discharged in time impacts the housing, which may seriously cause the problem of the housing cracking.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] A housing of a molded case circuit breaker includes an arc extinguishing chamber mounting base, and the arc extinguishing chamber mounting base includes a mounting portion and a diversion portion, wherein:

[0007] A plurality of first mounting cavities for mounting the arc extinguishing chamber of the molded case circuit breaker are arranged on the mounting portion;

[0008] A plurality of diversion channels are arranged on the diversion portion, the diversion channels are in one-to-one correspondence and communication with the first mounting cavities, the inlet of the diversion channel is oppositely arranged with the exhaust port of the corresponding arc extinguishing chamber, and the outlet of the diversion channel is communicated with the air outlet of the housing.

[0009] Further, the outlet of the diversion channel corresponds to the middle position of the arc extinguishing chamber.

[0010] Further, the mounting portion and the diversion portion are detachably connected.

[0011] Further, the joints between the mounting portion and the diversion portion are arranged with staggered stepped surfaces.

[0012] Further, a plurality of exhaust channels are arranged inside the housing. The inlets of the exhaust channels correspond to and communicate with the outlets of the diversion channels one by one, and the outlets of the exhaust channels communicate with the air outlet.

[0013] The opening area of the diversion channel shows a decreasing trend from the corresponding first installation cavity to the exhaust channel.

[0014] Further, it further includes a face cover, a middle cover, and a base that are sequentially and cooperatively connected from top to bottom.

[0015] A first cavity is formed between the face cover and the middle cover, and the first cavity is used to install the operating mechanism of the molded case circuit breaker.

[0016] A second cavity is formed between the middle cover and the base, and the arc extinguishing chamber mounting base is installed in the second cavity.

[0017] Further, it further includes a plug-in base connected to the bottom of the base. The plug-in base is used to install the wiring structure of the molded case circuit breaker, and the wiring structure is used to connect external lines.

[0018] The diversion part is connected to the plug-in base, and the exhaust channel penetrates through the plug-in base.

[0019] Further, the joints between the diversion part and the plug-in base are arranged with stepped surfaces staggered.

[0020] Further, a plurality of groups of second installation cavity groups are arranged on the plug-in base.

[0021] Each group of the second installation cavity groups includes two second installation cavities for installing the wiring structure, and the exhaust channel is located between the corresponding two second installation cavities.

[0022] The second object of the present utility model is to provide a molded case circuit breaker, which includes an arc extinguishing chamber and the housing of the molded case circuit breaker according to any one of the above.

[0023] The beneficial effects of the present utility model:

[0024] The present utility model provides a housing of a molded case circuit breaker and a molded case circuit breaker. The housing includes an arc extinguishing chamber mounting base, and the arc extinguishing chamber mounting base includes a mounting part and a diversion part, wherein: a plurality of first installation cavities for installing the arc extinguishing chamber of the molded case circuit breaker are arranged on the mounting part; a plurality of diversion channels are arranged on the diversion part, the diversion channels correspond to and communicate with the first installation cavities one by one, and the inlet of the diversion channel is oppositely arranged with the exhaust port of the corresponding arc extinguishing chamber, and the outlet of the diversion channel communicates with the air outlet of the housing.

[0025] The housing provided in this application has a diversion channel arranged between the exhaust port of the arc extinguishing chamber and the air outlet of the housing. On the one hand, it can collect and direct the gas discharged from the arc extinguishing chamber, enabling the gas to smoothly discharge from the housing along the diversion channel, thereby alleviating the problem of gas impacting the housing and enhancing the service life of the housing. On the other hand, the setting of the diversion channel lengthens the travel distance of the gas in the housing, thus extending the cooling time of the gas, further reducing the impact force of the gas on the housing, and at the same time, it can also improve the arc extinguishing effect and reduce the arcing distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 is a schematic structural diagram of the housing of the molded case circuit breaker provided in the embodiment of the present invention;

[0028] Figure 2 is an exploded view of the arc extinguishing chamber mounting base provided in the embodiment of the present invention;

[0029] Figure 3 is a three-dimensional schematic diagram of the diversion part provided in the embodiment of the present invention;

[0030] Figure 4 is a sectional view of the diversion part provided in the embodiment of the present invention.

[0031] REFERENCE MARKS:

[0032] 1 - Arc extinguishing chamber mounting base; 11 - Mounting part; 111 - First mounting cavity; 12 - Diversion part; 121 - Diversion channel; 122 - Diversion plate; 123 - Partition plate; 124 - Card strip; 2 - Air outlet; 3 - Face cover; 4 - Middle cover; 5 - Base; 6 - Plug-in base; 61 - Second mounting cavity; 7 - Bottom cover; 8 - Exhaust channel;

[0033] 100 - Arc extinguishing chamber; 200 - Operating mechanism; 300 - Wiring structure; 400 - Inlet terminal; 500 - Outlet terminal; 600 - Moving contact; 700 - Static contact; 800 - Deionization structure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The technical solution of the present utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0035] It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0036] It should be noted that in the description of the present utility model, the terms "connection" and "installation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or connected through an intermediate medium; it can be a mechanical connection, or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] In the existing molded case circuit breaker, the air outlet on the housing is usually adjacent to the back of the arc extinguishing chamber, and the opening area of the air outlet of the housing is small, resulting in the gas discharged from the arc extinguishing chamber being difficult to smoothly discharge out of the air outlet of the housing, and the gas that cannot be discharged in time impacts the housing, and in severe cases, the problem of the housing cracking may occur.

[0038] Based on this, the first aspect embodiment of the present utility model provides a housing of a molded case circuit breaker. Refer to Figure 1 , the housing includes an arc extinguishing chamber mounting base 1, and the arc extinguishing chamber mounting base 1 includes a mounting portion 11 and a diversion portion 12, wherein:

[0039] A plurality of first mounting cavities 111 for mounting the arc extinguishing chamber 100 of the molded case circuit breaker are provided on the mounting portion 11;

[0040] A plurality of diversion channels 121 are provided on the diversion portion 12. The diversion channels 121 correspond to and communicate with the first mounting cavities 111 one by one, and the inlet of the diversion channel 121 is disposed opposite to the exhaust port of the corresponding arc extinguishing chamber 100, and the outlet of the diversion channel 121 communicates with the air outlet 2 of the housing.

[0041] It should be noted that molded case circuit breakers are usually equipped with multiple arc extinguishing chambers 100. Correspondingly, the number of the first installation cavities 111 is also multiple, and the arc extinguishing chambers 100 are installed in the first installation cavities 111 one by one. The number of the first installation cavities 111 is adaptively adjusted according to product specifications and usage requirements, and no limitation is made here.

[0042] For the housing provided in this application, by arranging a diversion channel 121 between the exhaust port of the arc extinguishing chamber 100 and the air outlet 2 of the housing, on the one hand, it can collect and guide the gas discharged from the arc extinguishing chamber 100, so that the gas can smoothly discharge from the housing along the diversion channel 121, thereby alleviating the problem of gas impacting the housing and improving the service life of the housing; on the other hand, the arrangement of the diversion channel 121 lengthens the travel of the gas in the housing, thereby prolonging the cooling time of the gas, further reducing the impact force of the gas on the housing, and at the same time, it can also improve the arc extinguishing effect and reduce the arcing distance.

[0043] In this embodiment, the opening area of the diversion channel 121 shows a decreasing trend from the first installation cavity 111 to the air outlet 2 of the housing, which is more conducive to collecting the gas discharged from the arc extinguishing chamber 100.

[0044] Furthermore, the outlet of the diversion channel 121 corresponds to the middle position of the arc extinguishing chamber 100, and such a setting is beneficial to gathering the gas discharged from both ends of the arc extinguishing chamber 100.

[0045] On the basis of the above structure, the first installation cavity 111 and the diversion channel 121 are distributed in sequence in the vertical direction, the arc extinguishing grids of the arc extinguishing chamber 100 are arranged in parallel in the horizontal direction, and the incoming line terminal 400 of the molded case circuit breaker, the diversion channel 121, and the outgoing line terminal 500 of the molded case circuit breaker are distributed in sequence in the horizontal direction. The above arrangement makes full use of the internal space of the housing, so that on the basis of arranging the diversion channel 121, the volume of the housing is hardly increased.

[0046] Refer to Figure 2 , the installation part 11 and the diversion part 12 are detachably connected, and such a setting facilitates the installation of the arc extinguishing chamber 100 and the parameter test of the internal structure of the housing.

[0047] On the basis of the above structure, the joint surfaces of the installation part 11 and the diversion part 12 are arranged in a staggered step shape. Specifically, the circumferences of the joints of a corresponding group of the first installation cavities 111 and the diversion channels 121 are arranged in a staggered step shape, which can improve the sealing performance of the joints between the two, prevent gas from overflowing from the joints between the two, and at the same time, it can also improve the connection reliability between the two.

[0048] Refer to Figure 3, the flow guiding part 12 includes two flow guiding plates 122 arranged at intervals and a plurality of partition plates 123 connected between the two flow guiding plates 122. The area between the two flow guiding plates 122 is divided into a plurality of flow guiding channels 121 by the partition plates 123. The upper end surfaces of the flow guiding plates 122 and the partition plates 123 are respectively provided with ridges and / or grooves, and a stepped surface staggered structure is formed with the installation part 11 through the bosses and / or grooves.

[0049] Continue to refer to Figure 1 , a plurality of exhaust channels 8 are arranged in the housing. The inlets of the exhaust channels 8 correspond to and communicate with the outlets of the flow guiding channels 121 one by one. The outlets of the exhaust channels 8 are communicated with the air outlet 2; the opening area of the flow guiding channel 121 shows a decreasing trend from the corresponding first installation cavity 111 to the exhaust channel 8.

[0050] Specifically, the flow guiding channel 121 is generally in a flared shape. Its flared end is arranged opposite to the exhaust port of the arc extinguishing chamber 100, and its narrowed end is communicated with the inlet of the exhaust channel 8; the exhaust channel 8 is connected between the flow guiding channel 121 and the air outlet 2. When the molded case circuit breaker works, after the gas is ejected from the exhaust port of the arc extinguishing chamber 100, it can converge along the flow guiding channel 121 towards the middle of the circuit breaker, and finally enter the exhaust channel 8 and be discharged outwards along the exhaust channel 8. The arrangement of the exhaust channel 8 further extends the travel of the gas in the housing, thereby further improving the effect of cooling and arc extinguishing.

[0051] On the basis of the above structure, a deionization structure 800 is arranged in the flow guiding channel 121 and / or the exhaust channel 8. The metal particles in the gas are eliminated through the deionization structure 800, and the phenomenon of metal particles spraying out of the housing is reduced or eliminated.

[0052] Optionally, the deionization structure 800 can be a plurality of metal grids and / or metal wire groups formed by bending and winding metal wires. Among them, the metal grids can be made of porous metal plates or pressed by metal wires.

[0053] In this embodiment, the flow guiding channel 121 and / or the exhaust channel 8 is filled with metal wire groups; a plurality of parallel metal grids are laid at the outlet of the exhaust channel 8. The gas passes through the metal wire groups and a plurality of metal grids in sequence during the process of discharging out of the housing, so that the technical effect of zero flashover can be achieved.

[0054] Continue to refer to Figure 1 , the housing further includes a face cover 3, a middle cover 4 and a base 5 which are sequentially and cooperatively connected from top to bottom;

[0055] A first cavity is formed between the face cover 3 and the middle cover 4, and the first cavity is used for installing the operating mechanism 200 of the molded case circuit breaker;

[0056] A second cavity is formed between the middle cover 4 and the base 5, and the arc extinguishing chamber mounting base 1 is installed in the second cavity; the second cavity is also used to install the incoming line terminal 400, the outgoing line terminal 500, the moving contact 600 and the static contact 700 of the molded case circuit breaker.

[0057] As described above, the internal structure of the housing provided in this embodiment is integrally distributed in the height direction. The housing makes full use of the installation space in the height direction and is particularly suitable for occasions where the horizontal installation space is limited.

[0058] In this embodiment, the housing further includes a plug-in base 6 connected to the bottom of the base 5. The diversion part 12 is connected to the plug-in base 6, and the exhaust channel 8 penetrates through the plug-in base 6.

[0059] On the basis of the above structure, the joints between the base 5 and the plug-in base 6 and / or between the diversion part 12 and the plug-in base 6 are provided with stepped surfaces staggered to improve the sealing performance of the joints and the reliability of the connection.

[0060] In this embodiment, the plug-in base 6 is used to install the wiring structure 300 of the molded case circuit breaker, and the wiring structure 300 is used to connect external lines. Optionally, the wiring structure 300 is two bridge-shaped contacts. The upper parts of the two bridge-shaped contacts are respectively inserted and matched with the incoming line terminal 400 and the outgoing line terminal 500, and the lower parts of the two bridge-shaped contacts are used to access external lines.

[0061] Furthermore, the plug-in base 6 includes a number of groups of second installation cavity groups;

[0062] Each group of second installation cavity groups includes two second installation cavities 61 for installing the wiring structure 300, and the exhaust channel 8 is located between the two second installation cavities 61.

[0063] In this embodiment, the incoming line interface, the air outlet 2 and the outgoing line interface of the wiring structure 300 are all located at the bottom of the housing and are distributed in sequence in the horizontal direction.

[0064] In the above structure, the air outlet 2 and the operating mechanism 200 are respectively located at the upper and lower ends of the molded case circuit breaker. Therefore, the gas ejected from the air outlet 2 will not damage the operating mechanism 200, so that the safety performance of the product can be improved; furthermore, the setting of the plug-in base 6 further extends the length of the exhaust channel 8, thereby further improving the cooling and arc extinguishing effect; in addition, the wiring structure 300 inside the plug-in base 6 facilitates the wiring of the circuit breaker, and the exhaust channel 8 and the second installation cavity 61 are separated by a plate member, separating the gas from the wiring structure 300, thereby protecting the wiring structure 300 from the impact of the gas and the erosion of charged particles, and improving the insulation and safety of the wiring position.

[0065] Continue to refer to Figure 1, the housing further includes a bottom cover 7 connected to the bottom of the pluggable base 6. An air outlet 2 and a through hole for connecting to an external line access are provided on the bottom cover 7. The lower end of the exhaust passage 8 penetrates into the bottom cover 7 and communicates with the air outlet 2.

[0066] It should be noted that in other embodiments, the housing may not be provided with the pluggable base 6, that is, the housing includes a face cover 3, a middle cover 4, a base 5, and a bottom cover 7 that are sequentially and cooperatively connected from top to bottom. There is no installation space left in the housing of this embodiment for installing the wiring structure 300. The molded case circuit breaker using this housing can be externally provided with the wiring structure 300 or the incoming and outgoing line terminals and external lines can be connected by screws.

[0067] Refer to Figure 4 , as an alternative embodiment, the diversion channel 121 and the exhaust channel 8 are filled with a metal wire mass. The inner wall surface of the diversion channel 121 is provided with a clamping strip 124 for limiting the metal wire mass. The clamping strip 124 is located between the arc extinguishing chamber 100 and the metal wire mass and is spaced from the arc extinguishing chamber 100. It can limit the metal wire mass and prevent the distance between the metal wire mass and the arc extinguishing chamber 100 from being too small when the metal wire mass rebounds.

[0068] An embodiment of the second aspect of the present invention provides a molded case circuit breaker, which includes an arc extinguishing chamber 100 and the housing described in any of the above embodiments. Therefore, the circuit breaker at least has all the technical effects of the above housing, which will not be elaborated here.

[0069] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A housing of a molded case circuit breaker, characterized in that, It includes an arc extinguishing chamber mounting base (1), and the arc extinguishing chamber mounting base (1) includes a mounting portion (11) and a current guiding portion (12), wherein: A number of first mounting cavities (111) for mounting the arc extinguishing chamber (100) of the molded case circuit breaker are provided on the mounting portion (11); A number of current guiding channels (121) are provided on the current guiding portion (12), the current guiding channels (121) correspond to and communicate with the first mounting cavities (111) one by one, the inlet of the current guiding channel (121) is oppositely arranged with respect to the exhaust port of the corresponding arc extinguishing chamber (100), and the outlet of the current guiding channel (121) communicates with the air outlet (2) of the housing; 2. The housing of the molded case circuit breaker according to claim 1, characterized in that, The outlet of the current guiding channel (121) corresponds to the middle position of the arc extinguishing chamber (100).

3. The housing of the molded case circuit breaker according to claim 1, characterized in that, The mounting portion (11) and the current guiding portion (12) are detachably connected.

4. The housing of the molded case circuit breaker according to claim 3, characterized in that, The joints between the mounting portion (11) and the current guiding portion (12) are arranged with staggered stepped surfaces.

5. The housing of the molded case circuit breaker according to claim 1, characterized in that, A number of exhaust channels (8) are provided in the housing, the inlets of the exhaust channels (8) correspond to and communicate with the outlets of the current guiding channels (121) one by one, and the outlets of the exhaust channels (8) communicate with the air outlet (2); The opening area of the current guiding channel (121) shows a decreasing trend from the corresponding first mounting cavity (111) to the exhaust channel (8).

6. The housing of the molded case circuit breaker according to claim 5, characterized in that, It further includes a face cover (3), a middle cover (4), and a base (5) which are sequentially connected and matched from top to bottom; A first cavity is formed between the face cover (3) and the middle cover (4), and the first cavity is used for mounting the operating mechanism (200) of the molded case circuit breaker; A second cavity is formed between the middle cover (4) and the base (5), and the arc extinguishing chamber mounting base (1) is mounted in the second cavity.

7. The housing of the molded case circuit breaker according to claim 6, characterized in that, It further includes a plug-in base (6) connected to the bottom of the base (5), the plug-in base (6) is used for mounting the wiring structure (300) of the molded case circuit breaker, and the wiring structure (300) is used for connecting external lines; The current guiding portion (12) is connected to the plug-in base (6), and the exhaust channel (8) penetrates through the plug-in base (6).

8. The housing of the molded case circuit breaker according to claim 7, characterized in that, The joints between the current guiding portion (12) and the plug-in base (6) are arranged with staggered stepped surfaces.

9. The housing of the molded case circuit breaker according to claim 7, characterized in that, A number of groups of second mounting cavity groups are provided on the plug-in base (6); Each group of the second mounting cavity groups includes two second mounting cavities (71) for mounting the wiring structure (300), and the exhaust channel (8) is located between the corresponding two second mounting cavities (71).

10. A molded case circuit breaker, characterized in that, It includes an arc extinguishing chamber (100) and the housing of the molded case circuit breaker according to any one of claims 1 to 9.

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