Capacity-increased small-size modular molded case circuit breaker

Abstract

The utility model provides a capacity-increasing small-volume modularized molded case circuit breaker, which comprises at least one group of contact assemblies, each contact assembly comprises at least one static contact arranged oppositely and at least two mutually independent moving contacts, the static contacts are provided with static contacts, the moving contacts are respectively provided with moving contacts, and the static contacts and the moving contacts are mutually independent. The movable contacts are in contact with the static contact, a rotating shaft is connected between the two movable contacts, the contact assembly has a closing state in which the movable contacts are attracted with the movable contacts and an opening state in which the movable contacts are separated from the static contact, and the circuit breaker overcomes the defect that in the prior art, the size of a circuit breaker needs to be increased, and a mold needs to be opened again, so that the cost is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, and in particular to a capacity-increased, small-volume modular molded case circuit breaker. Background Art

[0002] Circuit breakers are used to protect circuits and equipment. They can quickly cut off circuits when current is overloaded or short-circuited, preventing equipment damage and safety accidents such as fire, and protecting electrical equipment from damage. In the existing technology, in order to enable circuit breakers to meet the load requirements of larger currents, their rated current carrying capacity needs to be improved through modification or replacement. The greater the current carrying capacity, the larger the contact area of ​​the contacts needs to be, and the contact assembly also needs to be correspondingly increased. To accommodate the larger contact assembly, the volume of the circuit breaker also needs to be increased, resulting in the need to re-open the mold, resulting in increased production costs. Utility Model Content

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that increasing the volume of the circuit breaker requires re-molding, which leads to increased costs, thereby providing a small-volume modular molded case circuit breaker that can increase the current carrying capacity without changing the volume of the circuit breaker.

[0004] To this end, the present invention provides a capacity-increasing, small-volume modular molded case circuit breaker, comprising at least one group of contact assemblies, wherein the contact assembly comprises at least one static contact arranged opposite to each other and at least two independent moving contacts, wherein the static contact is provided with a static contact point, and the moving contacts are respectively provided with a moving contact point, wherein the moving contacts are both in contact with the static contact point, and a rotating shaft is connected between the two moving contacts, and the contact assembly has a closed state in which the moving contacts are attracted to each other and an open state in which the moving contacts are separated from the static contacts.

[0005] Furthermore: a rotating shaft is fixed to the outside of the moving contact, an extension rod is provided at the moving contact, and an elastic part is provided inside the rotating shaft. When the contact assembly switches from the open state to the closed state, the extension rod can squeeze the elastic part to keep the moving contact against the static contact with a pressing force.

[0006] Furthermore: a linkage plate is provided between the elastic member and the extension rod, and a supporting rod capable of abutting against the linkage plate is further provided in the rotating shaft, and the linkage plate swings between the extension rod and the supporting rod.

[0007] Further: the moving contact includes a first contact and a second contact arranged in parallel, the extension rod includes a first rod and a second rod, the first contact is provided with a first through-groove for the first rod to pass through, and the second contact is provided with a second through-groove for the second rod to pass through, the linkage plate includes a first connecting plate linked to the first rod and a second connecting plate linked to the second rod, the first connecting plate and the second connecting plate are connected in series through a push rod, and the elastic member includes a first spring linked to the first connecting plate and a second spring linked to the second connecting plate.

[0008] Furthermore: a hinge shaft for connecting the first contact and the second contact is provided between the first contact and the second contact, and a partition block located between the first contact and the second contact is coaxially provided on the hinge shaft.

[0009] Furthermore: the side of the moving contact facing away from the moving contact is connected to a conductive wire, the side of the conductive wire facing away from the moving contact is connected to a bimetallic strip, the bimetallic strip is connected to a copper strip, and the side of the copper strip facing away from the bimetallic strip is connected to a terminal.

[0010] Furthermore: the copper sheet has a connecting end in contact with the bimetallic sheet and an extending end connected to the wiring terminal, and an inclined end connecting the connecting end and the extending end is provided between the connecting end and the extending end.

[0011] The technical solution of this utility model has the following advantages:

[0012] 1. The utility model provides a small-volume modular molded case circuit breaker with increased capacity, wherein the contact assembly includes a static contact and at least two moving contacts in contact with the static contact, and the two moving contacts are in an independent state. By increasing the setting of the moving contact, the area of ​​the moving contact can naturally be increased, thereby increasing the contact area between the moving contact and the static contact, thereby increasing the conductivity. When a single moving contact is used to contact the static contact, the moving contact and the static contact contact more frequently during use, and the moving contact will be burned, resulting in pits on the surface of the moving contact, resulting in a smaller and smaller contact area, thereby causing the temperature of the contact surface to increase. However, a structure with two moving contacts is adopted, and two moving contacts are respectively welded on the two moving contacts. When one moving contact has poor contact, the other moving contact can still contact the static contact, thereby ensuring that the moving contact and the static contact have sufficient contact area and the conductive performance between the two is guaranteed.

[0013] 2. The utility model provides a modular molded case circuit breaker with increased capacity and small volume. A rotating shaft is fixed to the outside of the moving contact. When the contact assembly switches from the open state to the closed state, the moving contact rotates toward the side of the static contact. At this time, the elastic member will be squeezed toward the side close to the extension plate, and the elastic member will contract, thereby providing a clamping force to ensure that the moving contact and the static contact maintain full contact, thereby increasing the contact area between the moving contact and the static contact and improving the conductivity between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 Schematic diagram of the overall structure of the contact assembly;

[0016] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0017] Figure 3 is another side view of the contact assembly;

[0018] Figure 4 is another structural schematic diagram of the contact assembly;

[0019] Figure 5 It is a partial structural schematic diagram of the contact assembly;

[0020] Figure 6 is a schematic diagram of another part of the structure of the contact assembly;

[0021] Figure 7 Schematic diagram of the cross-section structure of the circuit breaker.

[0022] Description of reference numerals:

[0023] 1. Contact assembly; 11. Static contact; 12. Moving contact; 13. First contact; 14. Second contact; 15. First through slot; 16. Second through slot; 17. Conductive wire; 18. Bimetallic strip; 2. Static contact; 21. Moving contact; 3. Rotating shaft; 31. Copper sheet; 311. Connecting end; 312. Extending end; 313. Inclined end; 4. Rotating shaft; 5. Extension rod; 51. First rod; 52. Second rod; 6. Elastic member; 61. First spring; 62. Second spring; 7. Linkage plate; 71. First connecting plate; 72. Second connecting plate; 8. Retaining rod; 9. Articulated shaft; 91. Separator. DETAILED DESCRIPTION

[0024] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Example

[0029] This embodiment provides a capacity-increased, small-volume modular molded case circuit breaker, comprising at least one group of contact assemblies 1, wherein the contact assembly 1 comprises at least one static contact 11 and at least two independent moving contacts 12 arranged opposite to each other, wherein the static contact 11 is provided with a static contact 2, and the moving contacts 12 are respectively provided with a moving contact 21, wherein the moving contacts 21 are both in contact with the static contact 2, and a rotating shaft 3 is connected between the two moving contacts 12. The contact assembly 1 has a closed state in which the moving contacts 21 are attracted to each other and an open state in which the moving contacts 21 are separated from the static contact 2.

[0030] The above specific improvements are: Figure 1-Figure 4As shown, the contact assembly 1 includes a static contact 11 and at least two moving contacts 12 in contact with the static contact 11, and the two moving contacts 12 are in an independent state. By increasing the setting of the moving contact 12, the area of ​​the moving contact 21 can naturally be increased, thereby increasing the contact area between the moving contact 21 and the static contact 2, thereby increasing the conductivity. When one moving contact 12 is used to contact the static contact 11, during use, the moving contact 21 contacts the static contact 2 more, and the moving contact 21 will be burned, resulting in pits on the surface of the moving contact 21, resulting in a smaller and smaller contact area, thereby causing the temperature of the contact surface to increase. However, a structure with two moving contacts 12 is adopted, and two moving contacts 21 are welded on the two moving contacts 12 respectively. Then, when one moving contact 12 has poor contact, the other moving contact 12 can still contact the static contact 11, thereby ensuring that the moving contact 21 and the static contact 2 have sufficient contact area and ensuring the conductivity between the two.

[0031] On the basis of the above embodiment: a rotating shaft 4 is fixed to the outside of the moving contact 12, an extension rod 5 is provided at the moving contact 12, and an elastic member 6 is provided inside the rotating shaft 4. When the contact assembly 1 switches from the open state to the closed state, the extension rod 5 can squeeze the elastic member 6 to keep the moving contact 12 against the static contact 11 with a tight force.

[0032] The above specific improvements are: Figure 2 and Figure 4 As shown, a rotating shaft 4 is fixed to the outside of the moving contact 12. When the contact assembly 1 switches from the open state to the closed state, the moving contact 12 rotates toward the side of the static contact 11. At this time, the elastic member 6 will be squeezed toward the side close to the extension plate 5, and the elastic member 6 will shrink, thereby providing a clamping force to keep the moving contact 12 and the static contact 11 in full contact, thereby increasing the contact area between the moving contact 12 and the static contact 11 and improving the conductivity between the two.

[0033] On the basis of the above embodiment: a linkage plate 7 is provided between the elastic member 6 and the extension rod 5, and a push rod 8 capable of abutting against the linkage plate 7 is further provided in the rotating shaft 4, and the linkage plate 7 swings between the extension rod 5 and the push rod 8.

[0034] The above specific improvements are: Figure 4 As shown, a linkage plate 7 is provided between the elastic member 6 and the extension rod 5, and the outside of the linkage plate 7 is in contact with the extension rod 5, and a push rod 8 is provided inside the rotating shaft 4. When the contact assembly 1 switches from the open state to the closed state, the elastic member 6 will be squeezed, and the push rod 8 will abut against the linkage plate 7 at this time, thereby preventing the rotating shaft 4 from excessive rotation.

[0035] On the basis of the above embodiment: the moving contact 12 includes a first contact 13 and a second contact 14 arranged in parallel, the extension rod 5 includes a first rod 51 and a second rod 52, the first contact 13 is provided with a first through-slot 15 for the first rod 51 to pass through, and the second contact 14 is provided with a second through-slot 16 for the second rod 52 to pass through, the linkage plate 7 includes a first connecting plate 71 linked to the first rod 51 and a second connecting plate 72 linked to the second rod 52, the first connecting plate 71 and the second connecting plate 72 are connected in series through the push rod 8, and the elastic member 6 includes a first spring 61 linked to the first connecting plate 71 and a second spring 62 linked to the second connecting plate 72.

[0036] The above specific improvements are: Figure 5 and Figure 6 As shown, the moving contact 12 includes a first contact 13 and a second contact 14, the first rod 51 is passed through the first contact 13, and the second rod 52 is passed through the second contact 14. The first contact 13 and the second contact 14 are independent of each other, and the linkage rod is divided into a first connecting plate 71 and a second connecting plate 72. The elastic member 6 includes a first spring 61 and a second spring 62, and the first connecting plate 71 and the second connecting plate 72 correspond to the first spring 61 and the second spring 62 respectively. Only one push rod 8 is used and passed through the first connecting plate 71 and the second connecting plate 72, so that the first connecting plate 71 and the second connecting plate 72 can maintain synchronous rotation, thereby squeezing the first spring 61 and the second spring 62 at the same time, thereby ensuring that when the contact assembly 1 switches between the open state and the closed state, a pressing force is provided to keep the moving contact 12 and the static contact 11 in full contact, thereby increasing the contact area between the moving contact 12 and the static contact 11 and improving the conductivity between the two.

[0037] On the basis of the above embodiment: a hinge shaft 9 for connecting the first contact 13 and the second contact 14 is provided between the first contact 13 and the second contact 14 , and a partition block 91 located between the first contact 13 and the second contact 14 is coaxially provided on the hinge shaft 9 .

[0038] The above specific improvements are: Figure 5 and Figure 6 As shown, a hinge shaft 9 for connecting the first contact 13 and the second contact 14 is provided between the two, and a separator block 91 is coaxially provided at the hinge shaft 9. The separator block 91 is located between the first contact 13 and the second contact 14. By setting the separator block 91, the first contact 13 and the second contact 14 can be effectively separated, and by setting the hinge shaft 9, the first contact 13 and the second contact 14 can be connected without restricting the rotation of the first contact 13 and the second contact 14, so that they can rotate freely during the process of opening and closing the switch, so that when the first contact 13 is not in full contact with the static contact 11, the second contact 14 can still be in full contact with the static contact 11.

[0039] Based on the above embodiment: the side of the moving contact 12 facing away from the moving contact 21 is connected to a conductive wire 17, the side of the conductive wire 17 facing away from the moving contact 12 is connected to a bimetallic strip 18, the bimetallic strip 18 is connected to a copper sheet 31, and the side of the copper sheet 31 facing away from the bimetallic strip 18 is connected to the wiring terminal.

[0040] Based on the above embodiment: the copper sheet 31 has a connecting end 311 in contact with the bimetallic strip 18 and an extending end 312 connected to the terminal block, and an inclined end 313 connecting the connecting end 311 and the extending end 312 is provided between the connecting end 311 and the extending end 312 .

[0041] The above specific improvements are: Figure 7 As shown, in the prior art, the copper sheet 31 is set as a "J"-shaped structure. Since sufficient heat needs to be generated between the copper sheet 31 and the bimetallic sheet 18 to provide to the bimetallic sheet 18, thereby pushing the traction rod, there are requirements for the length of the connection end 311 during the production process. In order to reduce the resistance, it is necessary to shorten the distance through which the current passes (the shorter the distance through which the current passes, the resistance of the copper material is inversely proportional to the length, and the longer the length, the greater the resistance). Therefore, the connection end 311 and the extension end 312 are connected by an inclined end 313. Compared with the "J"-shaped structure in the prior art, this structure can shorten the distance through which the current passes while saving copper.

[0042] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A small-volume modular molded case circuit breaker with increased capacity, characterized by: The invention comprises at least one group of contact components (1), wherein the contact components (1) comprise at least one static contact (11) and at least two independent moving contacts (12), the static contact (11) being provided with a static contact point (2), the moving contact (12) being provided with a moving contact point (21), the moving contacts (21) being in contact with the static contact point (2), a rotating shaft (3) being connected between the two moving contacts (12), and the contact components (1) having a closed state in which the moving contact point (21) is attracted to the moving contact point (21) and an open state in which the moving contact point (21) is separated from the static contact point (2).

2. The capacity-increased, small-volume modular molded case circuit breaker according to claim 1, characterized in that: A rotating shaft (4) is fixed to the outside of the moving contact (12), an extension rod (5) is provided at the moving contact (12), and an elastic member (6) is provided inside the rotating shaft (4); when the contact assembly (1) switches from an open state to a closed state, the extension rod (5) can squeeze the elastic member (6) to keep the moving contact (12) pressed against the static contact (11).

3. The capacity-increased small-volume modular molded case circuit breaker according to claim 2, characterized in that: A linkage plate (7) is provided between the elastic member (6) and the extension rod (5), and a push rod (8) capable of abutting against the linkage plate (7) is also provided in the rotating shaft (4). The linkage plate (7) swings between the extension rod (5) and the push rod (8).

4. The capacity-increased, small-volume modular molded case circuit breaker according to claim 3, characterized in that: The movable contact (12) includes a first contact (13) and a second contact (14) arranged in parallel. The extension rod (5) includes a first rod (51) and a second rod (52). The first contact (13) is provided with a first through-slot (15) for the first rod (51) to pass through. The second contact (14) is provided with a second through-slot (16) for the second rod (52) to pass through. The linkage plate (7) includes a first connecting plate (71) linked to the first rod (51) and a second connecting plate (72) linked to the second rod (52). The first connecting plate (71) and the second connecting plate (72) are connected in series via a push rod (8). The elastic member (6) includes a first spring (61) linked to the first connecting plate (71) and a second spring (62) linked to the second connecting plate (72).

5. The capacity-increased small-volume modular molded case circuit breaker according to claim 4, characterized in that: A hinge shaft (9) for connecting the first contact (13) and the second contact (14) is provided between the two, and a partition block (91) located between the first contact (13) and the second contact (14) is coaxially provided on the hinge shaft (9).

6. A small-volume modular molded case circuit breaker with increased capacity according to any one of claims 1 to 5, characterized in that: The side of the movable contact (12) facing away from the movable contact point (21) is connected to a conductive wire (17), the side of the conductive wire (17) facing away from the movable contact (12) is connected to a bimetallic strip (18), the bimetallic strip (18) is connected to a copper strip (31), and the side of the copper strip (31) facing away from the bimetallic strip (18) is connected to a connection terminal.

7. The capacity-increased, small-volume modular molded case circuit breaker according to claim 6, characterized in that: The copper sheet (31) has a connection end (311) in contact with the bimetallic sheet (18) and an extension end (312) connected to the connection terminal. An inclined end (313) is provided between the connection end (311) and the extension end (312) to connect the two.

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