Dual protection structure of circuit breaker

Abstract

The application discloses a double-protection structure of a circuit breaker. The double-protection structure of the circuit breaker can solve the problem that the double-protection structure of the current circuit breaker can influence the performance of a bimetallic strip. The housing inner wall is provided with a limiting mechanism which is matched with the mutual inductor in the circumferential direction and / or the axial direction. The mutual inductor is provided with a sensing hole in the axial direction. The bimetallic strip comprises a connecting section, an intermediate section and an action section. The connecting section is connected with the connecting piece. The action section is used for driving the lock catch of the circuit breaker to act. At least part of the intermediate section is arranged in the sensing hole. The sensing hole is used for providing the intermediate section arranged in the sensing hole with the space required by the action when the bimetallic strip is deformed. The double-protection structure of the circuit breaker can normally provide the double-protection function. Only a small change is needed for the existing circuit breaker. The double-protection structure of the circuit breaker can be matched with the conventional bimetallic strip. The mold cost of the enterprise is reduced. The mutual inductor does not influence the deformation of the bimetallic strip and does not influence the performance of the bimetallic strip.

Description

Technical Field

[0001] This invention relates to the field of switching electrical appliances, and more specifically to a dual protection structure for circuit breakers. Background Technology

[0002] A circuit breaker is a switching device that can close, carry, and interrupt current under normal circuit conditions and can close, carry, and interrupt current under abnormal circuit conditions within a specified time.

[0003] To improve safety, circuit breakers with dual protection are now available on the market. This means that when the electronic delay trip fails, the mechanical mechanism can also provide protection.

[0004] As shown in the patent with announcement number "CN 214313105 U", in order to install the current transformer at the same time without affecting the operation of the bimetallic strip, this circuit breaker can only make the bimetallic strip into a twisted structure. This affects the performance of the bimetallic strip and makes it incompatible with conventional bimetallic strips, increasing the cost for enterprises.

[0005] For example, as shown in the patent with publication number "CN 114496665 A", in order not to affect the operation of the bimetallic strip, the current transformer is placed above the swing space of the bimetallic strip. This makes it difficult to meet the limiting requirements of the current transformer. On the one hand, the bimetallic strip may rub against the axial surface of the current transformer when it swings, affecting its performance. On the other hand, the current transformer's limiting requirements are also difficult to meet. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention provides a dual protection structure for circuit breakers, which mainly solves the problem that the dual protection structure of current circuit breakers may affect the performance of bimetallic strips.

[0007] The technical solution adopted in this invention is: The circuit breaker has a dual protection structure, including a housing. Inside the housing are a current transformer, a bimetallic strip, and a connecting piece. The inner wall of the housing is provided with a limiting mechanism adapted to the current transformer circumferentially and / or axially. The current transformer has an axially arranged sensing hole. The bimetallic strip includes a connecting section, an intermediate section, and an operating section. The connecting section is connected to the connecting piece. The operating section is used to drive the locking action of the circuit breaker. At least part of the intermediate section is located in the sensing hole, and the sensing hole is used to provide the space required for the intermediate section located in the sensing hole to operate when the bimetallic strip is deformed.

[0008] The limiting mechanism includes a groove provided on the housing, and the current transformer is at least partially disposed in the groove, with the axial front and rear end faces of the current transformer respectively aligned with the front and rear inner walls of the groove.

[0009] The housing includes a detachably connected base and a top cover, both of which are provided with the sink groove.

[0010] The settling tank has a structure that is lower in the middle and higher at both ends.

[0011] The limiting mechanism also includes a boss provided on the inner wall of the housing, and the groove is provided on the boss.

[0012] The limiting mechanism further includes a first baffle and a second baffle disposed inside the housing. The first baffle and the second baffle are respectively disposed on both sides of the current transformer in the circumferential direction for limiting the current transformer in the horizontal direction.

[0013] The second baffle is the connecting piece or a portion thereof.

[0014] The connecting piece includes a first connecting section, a second connecting section, and an intermediate section. The first connecting section is used to connect with a connecting plate, and the second connecting end is used to connect with a bimetallic strip. The intermediate section includes a first piece and a second piece. The first piece is the second baffle, and the second piece is limited to the axial outer wall of the current transformer.

[0015] The housing is also provided with an arc-inducing plate, and the first baffle is part of the arc-inducing plate.

[0016] The axis of the current transformer is parallel to the extension direction of the bimetallic strip under normal conditions.

[0017] The beneficial effects of this invention are: This invention provides a dual protection structure for circuit breakers, which can provide dual protection functions normally while requiring only minor modifications to existing circuit breakers. It can be adapted to conventional bimetallic strips, reducing enterprise mold costs. Furthermore, its current transformer does not affect the deformation of the bimetallic strip and will not affect its performance. Attached Figure Description

[0018] Figure 1 This is an exploded view of one embodiment of the present invention.

[0019] Figure 2 This is an internal schematic diagram of an embodiment of the present invention.

[0020] Figure 3 This is a partial three-dimensional illustration of an embodiment of the present invention. Figure 1 .

[0021] Figure 4 This is a partial three-dimensional illustration of an embodiment of the present invention. Figure 2 .

[0022] Figure 5 This is a partial three-dimensional illustration of an embodiment of the present invention. Figure 3 .

[0023] Figure 6 This is a perspective view of the top cover according to an embodiment of the present invention. Detailed Implementation

[0024] The invention will be further described below with reference to the accompanying drawings: As shown in the figures, the circuit breaker's dual protection structure includes a housing 1, within which a current transformer 2, a bimetallic strip 3, and a connecting piece 4 are provided. The inner wall of the housing is provided with a limiting mechanism adapted to the current transformer circumferentially and / or axially. The current transformer is provided with a sensing hole 21 axially. The bimetallic strip includes a connecting section 31, an intermediate section 32, and an actuating section 33. The connecting section is connected to the connecting piece. The actuating section is used to drive the circuit breaker's latch 91 to actuate. At least a portion of the intermediate section is located within the sensing hole, and the sensing hole is used to provide the space required for the intermediate section located within the sensing hole to actuate when the bimetallic strip deforms.

[0025] First, the current transformer is used for signal connection to the circuit board, and the connecting piece is used for electrical connection to the terminal block. The working principle of the current transformer and how the bimetallic strip drives the latch are existing technologies and will not be elaborated further. Here, there is a limiting mechanism on the inner wall of the housing. This limiting mechanism limits the current transformer at least in one axial direction, or the circumferential direction (referring to the horizontal left-right direction). The axial direction is based on the axis of the current transformer. It should be noted that the current transformer itself can be circular or other shapes, without limitation. Similarly, the sensing hole can also be a circular hole or other shapes. When the bimetallic strip overheats, it will strain to drive the latch. Figure 2 For example, its deformation will swing to the right. The space inside the sensing hole is sufficient for the bimetallic strip to swing. In other words, the inner wall of the transformer does not interfere with or contact the bimetallic strip, and will not affect the action of the bimetallic strip.

[0026] In this embodiment, as shown in the figure, the limiting mechanism includes a recess 51 provided on the housing. The current transformer is at least partially disposed within the recess, and its axial front and rear end faces are respectively aligned with the front and rear inner walls of the recess. It should be noted that the recess can be directly disposed on the inner wall of the housing, or a boss can be provided within the housing, and then the recess is placed on the boss. The circumferential outer wall portion of the current transformer is disposed within the recess, with its front and rear end faces facing the front and rear inner walls of the recess. A 2mm to 5mm allowable space can exist between the two, serving as a limiting mechanism without affecting installation.

[0027] In this embodiment, as shown in the figure, the housing includes a detachably connected base 10 and a top cover 11, both of which are provided with the recessed groove. The recessed groove on both the base and the top cover better limits the position of the current transformer, preventing it from shaking and reducing errors caused by displacement due to shaking that could lead to contact between the bimetallic strip and the current transformer.

[0028] In this embodiment, as shown in the figure, the settling trough has a structure that is lower in the middle and higher at both ends. This structure is well-suited for circular current transformers, specifically a V-shaped groove or a U-shaped groove, so that the bottom of the current transformer rests in the middle of the settling trough, further enhancing the limiting effect.

[0029] In this embodiment, as shown in the figure, the limiting mechanism further includes a boss 52 provided on the inner wall of the housing, and the recess is provided on the boss. By placing the recess on the boss, the thickness of the outer wall of the housing is not dependent on the thickness of the current transformer, which allows for better installation of the current transformer and reduces the possibility of displacement due to shaking.

[0030] In this embodiment, as shown in the figure, the limiting mechanism further includes a first baffle 53 and a second baffle disposed within the housing. The first baffle and the second baffle are respectively disposed on both sides of the current transformer in the circumferential direction to limit the current transformer in the horizontal direction. The circumferential sides can refer to the left and right sides in the horizontal direction. These two baffles increase the limitation on the current transformer and prevent it from swaying left and right.

[0031] In this embodiment, as shown in the figure, the second baffle is either the connecting piece or a portion thereof. Preferably, the second baffle is directly made from the connecting piece or a portion thereof, thus achieving this function without additional parts, resulting in a more compact structure without increasing costs.

[0032] In this embodiment, as shown in the figure, the connecting piece includes a first connecting segment 41, a second connecting segment 42, and an intermediate segment 43. The first connecting segment is used to connect with the connecting plate 92, and the second connecting segment is used to connect with the bimetallic strip. The intermediate segment includes a first piece 431 and a second piece 432. The first piece is the second baffle, and the second piece is matched with the axial outer wall of the current transformer for limiting. The first piece can be adjusted according to the installation position of the current transformer, such as by folding it outward to form a slot, to accommodate the installation of the current transformer. The second piece is connected to the first connecting segment, and its position relative to the axial outer side of the current transformer also plays a role in preventing axial displacement of the current transformer.

[0033] In this embodiment, as shown in the figure, an arc-guiding plate 6 is also provided inside the housing, and the first baffle is a part of the arc-guiding plate. Similarly, a similar structure can be made on the arc-guiding plate to limit the movement of the other side of the current transformer, which can better prevent the current transformer from shaking.

[0034] In this embodiment, as shown in the figure, the axis of the current transformer is parallel to the extension direction of the bimetallic strip in its normal state. The normal state here refers to the state relative to the deformation of the bimetallic strip; this arrangement facilitates assembly.

[0035] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] The embodiments described with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention. The embodiments should not be considered as limiting the invention, but any improvements made based on the spirit of the invention should be within the scope of protection of the invention.

Claims

1. A circuit breaker with a dual protection structure, comprising a housing (1), wherein a current transformer (2), a bimetallic strip (3), and a connecting piece (4) are disposed within the housing, characterized in that: The inner wall of the housing is provided with a limiting mechanism that is adapted to the circumferential and / or axial direction of the current transformer. The transformer is provided with an induction hole (21) in the axial direction. The bimetallic strip includes a connecting section (31), an intermediate section (32) and an operating section (33). The connecting section is connected to the connecting piece. The operating section is used to drive the latch (91) of the circuit breaker to operate. At least part of the intermediate section is located in the induction hole. The induction hole is used to provide the space required for the intermediate section located in the induction hole to operate when the bimetallic strip is deformed.

2. The dual protection structure of the circuit breaker according to claim 1, characterized in that: The limiting mechanism includes a recess (51) provided on the housing, and the current transformer is at least partially disposed in the recess, with the axial front and rear end faces of the current transformer respectively disposed opposite to the front and rear inner walls of the recess.

3. The dual protection structure of the circuit breaker according to claim 2, characterized in that: The housing includes a detachably connected base (10) and a top cover (11), both of which are provided with the sink groove.

4. The dual protection structure of the circuit breaker according to claim 2 or 3, characterized in that: The settling tank has a structure that is lower in the middle and higher at both ends.

5. The dual protection structure of the circuit breaker according to claim 2 or 3, characterized in that: The limiting mechanism also includes a boss (52) provided on the inner wall of the housing, and the sink is provided on the boss.

6. The dual protection structure of the circuit breaker according to claim 1 or 2, characterized in that: The limiting mechanism further includes a first baffle (53) and a second baffle disposed inside the housing. The first baffle and the second baffle are respectively disposed on both sides of the transformer in the circumferential direction for limiting the transformer in the horizontal direction.

7. The dual protection structure of the circuit breaker according to claim 6, characterized in that: The second baffle is the connecting piece or a portion thereof.

8. The dual protection structure of the circuit breaker according to claim 7, characterized in that: The connecting piece includes a first connecting section (41), a second connecting section (42), and a second intermediate section (43). The first connecting section is used to connect with the connecting plate (92), and the second connecting section is used to connect with the bimetallic strip. The second intermediate section includes a first piece (431) and a second piece (432). The first piece is the second baffle, and the second piece is in a limiting fit with the axial outer wall of the transformer.

9. The dual protection structure of the circuit breaker according to claim 6, characterized in that: The housing is also provided with an arc-inducing plate (6), and the first baffle is part of the arc-inducing plate.

10. The dual protection structure of the circuit breaker according to claim 1, characterized in that: The axis of the current transformer is parallel to the extension direction of the bimetallic strip in its undeformed state.

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