Arc extinguishing installation structure and circuit breaker

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses an arc extinguishing installation structure and a circuit breaker. The arc extinguishing installation structure comprises an inner shell and an outer shell, the inner shell is used for containing a contact module, the outer shell is arranged outside the inner shell in a sleeving mode, cavities are formed between the two sides, in the width direction, of the inner shell and the outer shell respectively and used for containing magnetic conductive plates, and the cavities can correspond to the contact module in the width direction of the inner shell. The outer shell is sleeved outside the inner shell, and the cavity is formed between the inner shell and the outer shell, so that the magnetic conductive plate is mounted; and although the magnetic conductive plate is not arranged in the inner shell, the position of the magnetic conductive plate corresponds to the contact module, the arc extinguishing effect can still be achieved through a magnetic field, and the breaking capacity of the circuit breaker is improved. The circuit breaker comprises the contact module, the magnetic conductive plate and the arc extinguishing installation structure, the contact module is located in the inner shell, and the magnetic conductive plate is arranged in the cavity, so that the circuit breaker has good breaking capacity, current can be effectively cut off at the critical moment, and electrical safety is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, and particularly relates to an arc extinguishing installation structure and a circuit breaker. Background Technique

[0002] The breaking capacity of a circuit breaker refers to the ability to safely cut off the fault current, which is one of the important indicators to measure the performance of the circuit breaker. Whether the circuit breaker can quickly disconnect the circuit to play a protective role when a short circuit or ground fault occurs mainly depends on the arc extinguishing ability of the circuit breaker. Therefore, it is of great significance to improve the arc extinguishing ability of the circuit breaker to improve the breaking performance of the circuit breaker.

[0003] In the prior art, a magnetic conductive plate is usually arranged around the contact to improve the breaking capacity of the circuit breaker. The Chinese utility model patent with the application number 201320654591.5 discloses a blow arc type motor starter. The moving contact assembly is installed in the base, and a cavity is arranged inside the base so that the magnetic conductive plate can be installed in the cavity from the top. However, for a circuit breaker with a modular design of the contact system, the contact system is installed in two shells by closing two shells, and the magnetic conductive plate cannot be installed in the two shells. Therefore, there is still a problem that the magnetic conductive plate is not arranged around the contact system, resulting in poor breaking capacity of the circuit breaker.

[0004] Therefore, there is an urgent need to provide an arc extinguishing installation structure to arrange a magnetic conductive plate on a circuit breaker with a modular design contact system and improve the breaking capacity of the circuit breaker. Content of the Utility Model

[0005] The purpose of the utility model is to provide an arc extinguishing installation structure and a circuit breaker to arrange a magnetic conductive plate on a circuit breaker with a modular design contact system and improve the breaking capacity of the circuit breaker.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides an arc extinguishing installation structure, which includes:

[0008] An inner housing for accommodating a contact module;

[0009] An outer housing sleeved outside the inner housing. Cavities are formed between the two sides of the inner housing in the width direction and the outer housing respectively for placing magnetic conductive plates, and the cavities can correspond to the contact module in the width direction of the inner housing.

[0010] As an alternative technical solution of the arc extinguishing installation structure, along the width direction of the inner housing, a plurality of the inner housings are arranged side by side at intervals. The outer housing includes a plurality of spaced-apart wall plates, and each of the inner housings is individually attached between two adjacent wall plates, and a cavity is formed between the adjacent wall plates and the inner housing.

[0011] As an alternative technical solution of the arc extinguishing installation structure, two grooves are arranged side by side at intervals on both sides of the inner housing along the width direction, and the two grooves on the same side of the inner housing along the width direction can correspond to the two moving contacts of the moving contact bridge of the contact module one by one along the length direction of the inner housing.

[0012] As an alternative technical solution of the arc extinguishing installation structure, the inner housing includes a first inner housing and a second inner housing that are relatively closed. Grooves are respectively provided on the sides of the first inner housing and the second inner housing facing away from each other, and a cavity is formed between the grooves and the outer housing.

[0013] As an alternative technical solution of the arc extinguishing installation structure, a base is further included. An installation cavity is formed between the base and the outer housing, and the inner housing is arranged in the installation cavity;

[0014] Wherein, an opening is provided on one side of the cavity facing the base, and the base can block the opening.

[0015] As an alternative technical solution of the arc extinguishing installation structure, the base includes a bottom plate and a limiting strip protruding from the bottom plate. The inner housing is placed on the limiting strip, and the limiting strip closes the opening.

[0016] As an alternative technical solution of the arc extinguishing installation structure, the limiting strip has a concave installation position, and a part of the inner housing is inserted into the installation position and the edge abuts against the limiting strip.

[0017] As an alternative technical solution of the arc extinguishing installation structure, the limiting strip is annular and includes an inner ring groove; one side of the inner housing facing the bottom plate along the height direction includes a limiting surface and a limiting protrusion provided on the limiting surface. The limiting surface abuts against the limiting strip, and the limiting protrusion is inserted into the inner ring groove.

[0018] As an alternative technical solution of the arc extinguishing installation structure, the bottom plate has a boss protruding from the limiting strip along the circumferential direction, and the outer housing is sleeved outside the limiting strip and overlaps on the boss.

[0019] The present utility model provides a circuit breaker, which includes a contact module, a magnetic conduction plate and the arc extinguishing installation structure as described above. The contact module is located inside the inner housing, and the magnetic conduction plate is located inside the cavity.

[0020] Beneficial effects:

[0021] The utility model provides an arc extinguishing installation structure, which includes an inner housing and an outer housing. The inner housing is used to accommodate a contact module, and the outer housing is sleeved outside the inner housing. Cavities are formed between the two sides of the inner housing in the width direction and the outer housing respectively for placing magnetic conduction plates, and the cavities can correspond to the contact module along the width direction of the inner housing. By sleeving the outer housing outside the inner housing and forming cavities between the inner housing and the outer housing, the magnetic conduction plates can be installed. Although the magnetic conduction plates are not arranged inside the inner housing, the installation positions of the magnetic conduction plates correspond to the contact module, and the magnetic conduction plates can still play an arc extinguishing role through the magnetic field, improving the breaking capacity of the circuit breaker.

[0022] The utility model provides a circuit breaker, which includes a contact module, a magnetic conduction plate and an arc extinguishing installation structure. The contact module is located inside the inner housing. By arranging the magnetic conduction plate in the cavity, the circuit breaker has better breaking capacity, so that the current can be effectively cut off at a critical moment to ensure electrical safety. Description of the drawings

[0023] Figure 1 is a partial exploded view of the circuit breaker provided by the embodiment of the utility model;

[0024] Figure 2 is a schematic structural diagram of the inner housing and the magnetic conduction plate provided by the embodiment of the utility model;

[0025] Figure 3 is a schematic structural diagram of the first inner housing provided by the embodiment of the utility model;

[0026] Figure 4 is a partial cross-section of the circuit breaker provided by the embodiment of the utility model Figure 1 ;

[0027] Figure 5 is a partial cross-section of the circuit breaker provided by the embodiment of the utility model Figure 2 ;

[0028] Figure 6 is a partial cross-section of the circuit breaker provided by the embodiment of the utility model Figure 3 。

[0029] In the figure:

[0030] 100, magnetic conduction plate; 200, contact module; 201, moving contact;

[0031] 10, inner housing; 11, first inner housing; 12, second inner housing; 13, groove; 14, limiting surface;

[0032] 20, base; 21, bottom plate; 22, limiting strip;

[0033] 30. Outer housing; 31. Wall panel. Detailed implementation manner

[0034] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0035] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. 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 situations.

[0036] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on the top" of the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under the bottom" of the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is lower than that of the second feature.

[0037] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, 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 distinction in description and have no special meanings.

[0038] As Figures 1 to 6 shown, on the one hand, this embodiment provides a circuit breaker, which includes a contact module 200, a magnetic conductive plate 100, and an arc extinguishing installation structure. The contact module 200 is located inside the inner housing 10, and the magnetic conductive plate 100 is located inside the cavity.

[0039] On the other hand, this embodiment provides an arc extinguishing installation structure, which includes an inner housing 10 and an outer housing 30. The inner housing 10 is used to accommodate the contact module 200. The outer housing 30 is sleeved outside the inner housing 10. Cavities are formed between the two sides of the inner housing 10 in the width direction and the outer housing 30 respectively for placing the magnetic conductive plate 100. The cavities can correspond to the contact module 200 along the width direction of the inner housing 10. Among them, the width direction of the inner housing 10 is taken as the y direction, the length direction is taken as the x direction, and the height direction is taken as the z direction.

[0040] By sleeving the outer housing 30 outside the inner housing 10 and forming cavities between the inner housing 10 and the outer housing 30, the magnetic conductive plate 100 is installed. Although the magnetic conductive plate 100 is not arranged inside the inner housing 10, the installation position of the magnetic conductive plate 100 corresponds to the contact module 200, and it can still play an arc extinguishing role through the magnetic field, improving the breaking capacity of the circuit breaker. By setting a circuit breaker with a magnetic conductive plate 100, the circuit breaker has better breaking capacity, so that it can effectively cut off the current at a critical moment and ensure electrical safety.

[0041] Further, along the width direction of the inner housing 10, a plurality of inner housings 10 are arranged side by side at intervals. The outer housing 30 includes a plurality of spaced wall plates 31. Each inner housing 10 is separately attached between two adjacent wall plates 31, and cavities are formed between the adjacent wall plates 31 and the inner housing 10.

[0042] In this embodiment, three inner housings 10 are arranged side by side at intervals along the y direction. Each inner housing 10 is provided with a set of contact modules 200, and the three sets of contact modules 200 are respectively connected to three-phase electricity. The outer housing 30 includes four spaced wall plates 31. The wall plates 31 extend along the z direction, and the planes where the four wall plates 31 are located are parallel. Both sides of each inner housing 10 are attached to two adjacent wall plates 31.

[0043] By setting a plurality of wall plates 31 of the outer housing 30, cavities are formed between two adjacent wall plates 31 and the inner housing 10 to place a plurality of magnetic conductive plates 100, thereby meeting the arc extinguishing requirements of multiple sets of contact modules 200.

[0044] Optionally, the inner housing 10 includes a first inner housing 11 and a second inner housing 12 that are relatively closed. On the sides of the first inner housing 11 and the second inner housing 12 facing away from each other, grooves 13 are respectively provided. A cavity is formed between the grooves 13 and the outer housing 30. The first inner housing 11 and the second inner housing 12 can be closed to accommodate the contact module 200 inside the inner housing 10, and the grooves 13 are provided on the outside of the inner housing 10. By using the cavity formed between the grooves 13 and the outer housing 30, it is convenient to install the magnetic conduction plate 100 and also convenient to install the contact module 200 inside the inner housing 10. In other embodiments, the groove 13 can also be provided only on the outer housing 30, or grooves 13 can be provided on both the inner housing 10 and the outer housing 30.

[0045] Specifically, the first inner housing 11 and the second inner housing 12 are relatively closed along the y direction; the groove 13 extends along the z direction, where the extending direction of the groove 13 refers to the length direction of the groove 13; the shape of the groove 13 matches the shape of the magnetic conduction plate 100; the first inner housing 11 and the second inner housing 12 are detachably connected to fix the contact module 200 between the first inner housing 11 and the second inner housing 12.

[0046] In this embodiment, the magnetic conduction plate 100 is in the shape of a rectangular plate, and the groove 13 is rectangular; the first inner housing 11 and the second inner housing 12 are in snap-fit connection; one side of the first inner housing 11 is provided with a groove 13, and the other side of the first inner housing 11 protrudes with a hook; one side of the second inner housing 12 is provided with a groove 13, and the other side of the second inner housing 12 is provided with a slot that cooperates with the hook; a plurality of hooks are provided along the edge of the first inner housing 11, and the slots are arranged in one-to-one correspondence with the hooks. By setting the first inner housing 11 and the second inner housing 12 in snap-fit connection, the contact module 200 is clamped between the first inner housing 11 and the second inner housing 12, which is convenient for subsequently installing the inner housing 10 as a whole onto the base 20, with a simple structure and convenient disassembly. In other embodiments, hooks can also be provided on the second inner housing 12, and slots that cooperate with the hooks can be provided on the first inner housing 11.

[0047] Optionally, the arc extinguishing installation structure further includes a base 20. An installation cavity is formed between the base 20 and the outer housing 30, and the inner housing 10 is arranged in the installation cavity; wherein, an opening is provided on the side of the cavity facing the base 20, and the base 20 can block the opening. By using the base 20 and the outer housing 30 to form the installation cavity, the inner housing 10 and the magnetic conduction plate 100 are arranged in the installation cavity, which helps to limit the action space of the magnetic conduction plate 100 and makes the action effect of the magnetic conduction plate 100 more concentrated.

[0048] Optionally, the base 20 includes a bottom plate 21 and a limiting strip 22 protruding from the bottom plate 21. The inner housing 10 is placed on the limiting strip 22, and the limiting strip 22 closes the opening. By protruding the limiting strip 22 on the base 20 to close the opening, a closed cavity is formed at the groove 13 by the inner housing 10, the base 20, and the outer housing 30. The magnetic conduction plate 100 is installed in the closed cavity, which can more effectively control the movement of the arc, thereby better enhancing the arc extinguishing effect. In this embodiment, the bottom plate 21 and the limiting strip 22 are of an integrally formed structure.

[0049] Optionally, the limiting strip 22 has a concave mounting position. The inner housing 10 is partially inserted into the mounting position and its edge abuts against the limiting strip 22. In this embodiment, three limiting strips 22 are arranged side by side in the y direction, and each middle part of the limiting strip 22 has a concave mounting position. The three inner housings 10 are respectively inserted into the mounting positions of the three limiting strips 22. By providing the limiting strip 22 and the mounting position, the mounting position of the inner housing 10 can be effectively restricted, and it can also ensure that the limiting strip 22 closes the groove 13 from the bottom.

[0050] Further, the limiting strip 22 is annular and has an inner ring groove. The inner housing 10 extends in the height direction and has a limiting surface 14 on the side facing the bottom plate 21 and a limiting protrusion provided on the limiting surface 14. The limiting surface 14 abuts against the limiting strip 22, and the limiting protrusion is inserted into the inner ring groove. By providing the annular limiting strip 22, the limiting protrusion of the inner housing 10 is inserted into the inner ring groove, and the limiting surface 14 abuts against the limiting strip 22, so that the relative position between the inner housing 10 and the bottom plate 21 can be accurately restricted.

[0051] Further, the bottom plate 21 has a boss protruding circumferentially from the limiting strip 22. The outer housing 30 is sleeved outside the limiting strip 22 and overlaps on the boss. By providing the boss, the boss can restrict the relative mounting position between the outer housing 30 and the bottom plate 21, so as to ensure that the wall plate 31 of the outer housing 30 can fit against the outer side surface of the inner housing 10.

[0052] In this embodiment, the groove 13 has two side walls and a top wall surrounding the bottom surface of the groove. The two side walls limit the magnetic conduction plate 100 from the left and right sides respectively; the magnetic conduction plate 100 is placed on the limiting strip 22 of the base 20, the top of the magnetic conduction plate 100 fits against the top wall of the groove 13, and the limiting strip 22 and the top wall of the groove 13 cooperate to limit the magnetic conduction plate 100 from the upper and lower sides; the two sides of the magnetic conduction plate 100 respectively fit against the bottom surface of the groove 13 and the wall plate 31 of the outer housing 30, and the wall plate 31 and the bottom surface of the groove 13 are relatively positioned to limit the magnetic conduction plate 100 from both sides.

[0053] See Figures 4 to 6, on both sides of the inner housing 10 in the width direction, two grooves 13 are arranged side by side at intervals. The two grooves 13 on the same side of the inner housing 10 in the width direction can correspond to the two moving contacts 201 of the moving contact bridge of the contact module 200 along the length direction of the inner housing 10. By respectively arranging grooves 13 at the positions of the two moving contacts 201 of the corresponding moving contact bridge and arranging a magnetic conductive plate 100 at the grooves 13, the magnetic conductive plate 100 can act on the positions of the moving contacts 201, thereby enhancing the arc extinguishing ability of the circuit breaker and ensuring the arc extinguishing effect. In this embodiment, the setting height of the groove 13 matches the moving range of the moving contact bridge in the z direction.

[0054] Optionally, the arc extinguishing installation structure further includes fasteners. The fasteners penetrate from the bottom of the base 20 and the ends are fixed on the outer housing 30; the fasteners can be bolts; there are multiple bolts, and the bolts are all inserted between two adjacent limiting strips 22 and the ends are fixed on the wall plate 31 of the outer housing 30. By setting the fasteners, the outer housing 30 is fixed on the base 20 to prevent relative movement between the outer housing 30 and the base 20, thereby affecting the normal use of the circuit breaker.

[0055] The following is the specific installation process of the arc extinguishing installation system and the contact module 200:

[0056] First, close and combine the first inner housing 11 and the second inner housing 12 into the inner housing 10 to place the contact module 200 between the first inner housing 11 and the second inner housing 12, and the grooves 13 are located outside the inner housing 10; place each inner housing 10 on the base 20 so that the inner housing 10 is partially inserted into the installation position in the middle of the limiting strip 22. The limiting strip 22 can close the groove 13 from the bottom, place the magnetic conductive plate 100 at the groove 13, sleuth the outer housing 30 outside the limiting strip 22 and the edge is placed on the boss of the base 20, and use fasteners to fix the outer housing 30 on the base 20. It can be understood that after closing and combining the first inner housing 11 and the second inner housing 12 into the inner housing 10, the magnetic conductive plate 100 can also be first placed in the groove 13 of the inner housing 10, then the magnetic conductive plate 100 and the inner housing 10 are installed on the base 20 together, and finally the outer housing 30 is sleuthed and fixed.

[0057] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Arc extinguishing installation structure, characterized in that: include: An inner housing (10) for accommodating a contact module (200); The outer shell (30) is sleeved on the outside of the inner shell (10), and cavities are formed between the inner shell (10) and the outer shell (30) on both sides along the width direction, respectively, for placing the magnetic conductive plate (100), and the cavity can correspond to the contact module (200) along the width direction of the inner shell (10).

2. The arc extinguishing installation structure according to claim 1, characterized in that: Along the width direction of the inner shell (10), a plurality of the inner shells (10) are arranged side by side at intervals, the outer shell (30) comprises a plurality of wall panels (31) arranged at intervals, each of the inner shells (10) is individually fitted between two adjacent wall panels (31), and the cavity is formed between the adjacent wall panels (31) and the inner shell (10).

3. The arc extinguishing installation structure according to claim 1, characterized in that: Two grooves (13) are arranged side by side and at intervals on both sides of the inner housing (10) in the width direction, and the two grooves (13) located on the same side of the inner housing (10) in the width direction can correspond one by one to the two moving contacts (201) of the moving contact bridge of the contact module (200) along the length direction of the inner housing (10).

4. The arc extinguishing installation structure according to claim 1, characterized in that: The inner shell (10) comprises a first inner shell (11) and a second inner shell (12) which are relatively closed, and grooves (13) are respectively provided on the opposite sides of the first inner shell (11) and the second inner shell (12), and a cavity is formed between the groove (13) and the outer shell (30).

5. The arc extinguishing installation structure according to claim 1, characterized in that: It also includes a base (20), wherein a mounting cavity is formed between the base (20) and the outer shell (30), and the inner shell (10) is arranged in the mounting cavity; Wherein, an opening is provided on a side of the cavity facing the base (20), and the base (20) can cover the opening.

6. The arc extinguishing installation structure according to claim 5, characterized in that: The base (20) comprises a bottom plate (21) and a limiting strip (22) protruding from the bottom plate (21); the inner shell (10) is placed on the limiting strip (22), and the limiting strip (22) closes the opening.

7. The arc extinguishing installation structure according to claim 6, characterized in that: The limiting strip (22) has a concave installation position, and the inner shell (10) is partially inserted into the installation position with its edge abutting against the limiting strip (22).

8. The arc extinguishing installation structure according to claim 6, characterized in that: The limiting strip (22) is annular and includes an inner annular groove; The inner shell (10) comprises a limiting surface (14) and a limiting protrusion arranged on the limiting surface (14) on one side facing the bottom plate (21) in the height direction, the limiting surface (14) abuts against the limiting strip (22), and the limiting protrusion is inserted into the inner ring groove.

9. The arc extinguishing installation structure according to claim 6, characterized in that: The bottom plate (21) has a boss protruding from the limiting strip (22) along the circumferential direction, and the outer shell (30) is sleeved outside the limiting strip (22) and overlapped on the boss.

10. A circuit breaker, characterized in that It comprises a contact module (200), a magnetic conductive plate (100) and an arc extinguishing installation structure according to any one of claims 1 to 9, wherein the contact module (200) is located in the inner shell (10), and the magnetic conductive plate (100) is located in the cavity.

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