Large-current drawer type circuit breaker

Abstract

The utility model discloses a large-current drawer type circuit breaker in the technical field of low-voltage electrical equipment components, each phase of a circuit breaker body is formed by combining two groups of body slotting tools, each group of body slotting tools comprises two contacts which are arranged in an aligned manner and are spaced in the middle, each phase of a circuit breaker drawer seat is composed of two groups of outgoing line rows, and the two groups of outgoing line rows are arranged in parallel. A row of vertical bridge-shaped contacts are installed on the outgoing line bar, short circuit bars perpendicular to the plugging direction are installed on the upper surfaces and the lower surfaces of the front ends of the two contacts of each set of body slotting tool, the short circuit bars make full contact with the upper surfaces and the lower surfaces of the two contacts, and a rectangular space is formed between the two contacts. Through the above structure, the problem of difficult heat dissipation at the plugging position of the drawer type circuit breaker body and the drawer seat in the prior art is solved, and the technical effect of effectively reducing the temperature rise of the current drawer type circuit breaker is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical equipment components, in particular to a high-current drawer-type circuit breaker using a parallel contact connection structure. Background Art

[0002] In the low-voltage electrical industry, with the increasing power consumption and the development of wind power and photovoltaic industries, the power of distribution cabinets, inverters, etc. is also increasing, so the rated current of circuit breakers is increasing.

[0003] In the prior art, frame circuit breakers with large rated currents are basically three-pole or four-pole circuit breakers composed of two or three contact systems connected in parallel to form one phase. The temperature rise of drawer-type circuit breakers is higher than that of fixed circuit breakers, and in parallel, the air between the parallel contacts cannot be effectively utilized at the blades and bridge contacts of the body, resulting in a reduction in contact area and heat dissipation metal surface, resulting in the inability to effectively reduce the temperature rise. Summary of the invention

[0004] In view of the deficiencies of the prior art, the utility model provides a large current drawer-type circuit breaker to solve the problem of difficulty in reducing the temperature rise at the connection between the drawer-type circuit breaker body and the drawer seat in the prior art.

[0005] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A high current drawer type circuit breaker comprises a circuit breaker body and a circuit breaker drawer seat, wherein each phase of the circuit breaker body is composed of two groups of body blades, each group of body blades comprises two contacts arranged in an aligned manner with a gap in the middle, each phase of the circuit breaker drawer seat comprises two groups of outlet rows, a row of vertical bridge contacts is mounted on the outlet rows, the body blades are inserted into the bridge contacts at the connection position, a strip shorting row perpendicular to the plugging direction is mounted on the upper and lower sides of the front ends of the two contacts of each group of body blades, the shorting row is in full contact with the upper and lower surfaces of the two contacts and forms a rectangular space between the two contacts, the shorting row is a first contact area above and below the contacts, the shorting row is a second contact area above and below the rectangular space, and the bridge contact covers the first contact area and the second contact area at the same time.

[0007] Preferably, the strip short circuit bar is a long rectangle.

[0008] Preferably, the front end of the contact is provided with a screw hole at the rear portion which does not affect the plugging, and the corresponding position of the short-circuit bar is also provided with a screw hole, and the short-circuit bar is fixed to the contact by connecting screws passing through the screw holes and using connecting nuts.

[0009] Preferably, there are two screw holes.

[0010] Preferably, the connection direction of the screw holes is perpendicular to the contact plugging direction.

[0011] Preferably, the screw holes on the short-circuit bar are threaded holes.

[0012] Preferably, the outer edges of the outer surface of the short-circuit row have chamfer features.

[0013] Preferably, the chamfer feature is an oblique chamfer.

[0014] Preferably, the front end of the contact is provided with concave features at the top and bottom for installing a shorting bar.

[0015] Preferably, the short-circuit rows are connected to each other at the short sides.

[0016] The high-current drawer-type circuit breaker proposed in the utility model effectively increases the contact area, i.e., the second contact area, compared with the prior art by adding a strip-shaped shorting row between the body blade and the bridge-shaped contact, and forms a vertical square hole in the middle of the second contact area. The four sides of the square hole have a heat dissipation effect, thereby increasing the heat dissipation area and effectively reducing the temperature rise. At the same time, the structure is simple and convenient for production and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an isometric view of a drawer-type circuit breaker in a separated position according to an embodiment of the invention;

[0018] Figure 2 It is a top view schematic diagram of the connection position of a drawer-type circuit breaker in one embodiment;

[0019] Figure 3 It is a cross-sectional schematic diagram of a plug-in part of a connection position of an embodiment of a drawer-type circuit breaker along a plug-in direction AA;

[0020] Figure 4 It is an exploded schematic diagram of an embodiment of a body inserting knife;

[0021] Figure 5 It is a schematic diagram of the plugging of the body blade, the outlet row and the bridge contact of an embodiment of a drawer-type circuit breaker;

[0022] Figure 6 It is a top view schematic diagram of a drawer-type circuit breaker after the main body inserting blade is connected with the outlet row and the bridge contact in one embodiment;

[0023] Among them, 1-circuit breaker body, 11-body blade, 111-contact, 1111-recess feature, 112-short circuit row, 1121-chamfer feature, 112a-upper short circuit row, 112b-lower short circuit row, 113-connecting screws, 114-connecting nuts, 2-circuit breaker drawer seat, 21-outlet row, 22-bridge contact, 31-first contact area, 32-second contact area, 33-rectangular space. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0025] This embodiment provides a technical solution: the high-current drawer-type circuit breaker of the utility model comprises a circuit breaker body 1 and a circuit breaker drawer seat 2. Each phase of the circuit breaker body 1 is composed of two groups of body blades 11. This embodiment consists of three phases. Each group of body blades 11 includes two contacts 111 arranged in an aligned manner with a gap in the middle. Each phase of the circuit breaker drawer seat 2 is composed of two groups of outlet rows 21. A row of vertical bridge contacts 22 is installed on the outlet row 21. In the connection position, the body blades 11 are inserted into the bridge contacts 22. Each group of body blades 11 is connected to the bridge contacts 22. Strip short-circuit rows 112 perpendicular to the plug-in direction are installed on the upper and lower sides of the front ends of the two contacts 111 of the knife 11, namely, an upper short-circuit row 112a and a lower short-circuit row 112b. The short-circuit row 112 is in full contact with the upper and lower surfaces of the two contacts 111 and forms a vertical rectangular space 33 between the two contacts 111. The short-circuit row 112 is a first contact area 31 above and below the contacts 111, and the short-circuit row 112 is a second contact area 32 above and below the rectangular space 33. The bridge contact 22 covers the first contact area 31 and the second contact area 32 at the same time.

[0026] In this embodiment, the strip-shaped short-circuit bar 112 is a long rectangle, and the edges may also be changed to an ellipse.

[0027] There are many ways to connect and fix the contact 111 and the short-circuit bar 112, such as using a side spring clip or riveting. In order to facilitate production and installation, this embodiment uses screws and nuts for fixed installation, that is, screw holes are opened at the rear of the front end of the contact 111 that does not affect the plug-in, and screw holes are also opened at the corresponding position of the short-circuit bar 112. The short-circuit bar 112 is fixed to the contact 111 by connecting screws 113 through the screw holes and connecting nuts 114. There are two screw holes on each contact, and the connection direction of the screw holes is perpendicular to the contact plug-in direction. When the short-circuit bar 112 is relatively thick, the nuts can be omitted, and the screw holes on the short-circuit bar 112 can be tapped as threaded holes.

[0028] In order to facilitate the insertion and guidance of the shorting bar 112 into the bridge contact 22 , a chamfer feature 1121 is provided on the outer edge of the outer surface of the shorting bar 112 . The chamfer feature 1121 is a bevel chamfer in this embodiment, and may also be a circular arc chamfer in other embodiments.

[0029] To ensure that the contact 111 is compatible with the bridge contact 22 in size, the bridge contact 22 does not need to be replaced. The front end of the contact 111 is provided with recessed features 1111 for installing the shorting bar 112, so that the size after the shorting bar 112 is installed remains basically the same as before.

[0030] The short circuit row 112 can also be set as an integral whole, for example, connected to each other at the short sides, and clamped onto the contact 111 from the front of the contact 111 by interference fit, or connected to the outer long sides as a whole to reduce the number of parts, or the short sides and the outer long sides can be connected as a whole, with an opening on the inside, and clamped onto the contact 111 from the inside.

[0031] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high current drawer type circuit breaker, comprising a circuit breaker body (1) and a circuit breaker drawer seat (2), wherein each phase of the circuit breaker body (1) is composed of two groups of body blades (11), each group of body blades (11) comprises two contacts (111) arranged in an aligned manner with a gap in between, and each phase of the circuit breaker drawer seat (2) is composed of two groups of outlet rows (21), a row of vertical bridge contacts (22) is mounted on the outlet rows (21), and the body blades (11) are inserted into the bridge contacts (22) in the connection position, characterized in that: A strip-shaped short-circuit row (112) perpendicular to the plugging direction is installed on the upper and lower sides of the front ends of the two contacts (111) of each group of body insert blades (11); the short-circuit row (112) is in full contact with the upper and lower surfaces of the two contacts (111) and forms a rectangular space (33) between the two contacts (111); the short-circuit row (112) is a first contact area (31) above and below the contacts (111); the short-circuit row (112) is a second contact area (32) above and below the rectangular space (33); and the bridge contact (22) covers both the first contact area (31) and the second contact area (32).

2. The high current drawer type circuit breaker according to claim 1, characterized in that: The strip-shaped short-circuit bar (112) is a long rectangle.

3. The high current draw-out circuit breaker according to claim 1, characterized in that: The front end of the contact (111) is provided with a screw hole at the rear portion thereof which does not affect the plugging, and the corresponding position of the short-circuit bar (112) is also provided with a screw hole. The short-circuit bar (112) is fixed to the contact (111) by means of a connecting screw (113) passing through the screw hole and a connecting nut (114).

4. The high current draw-out circuit breaker according to claim 3, characterized in that: There are two screw holes.

5. The high current draw-out circuit breaker according to claim 3, characterized in that: The connection direction of the screw holes is perpendicular to the contact plugging direction.

6. The high current draw-out circuit breaker according to claim 5, characterized in that: The screw holes on the short-circuit bar (112) are threaded holes.

7. The high current draw-out circuit breaker according to claim 1, characterized in that: The outer edge of the outer surface of the short-circuit bar (112) is provided with a chamfer feature (1121).

8. The high current draw-out circuit breaker according to claim 7, characterized in that: The chamfer feature (1121) is an inclined chamfer.

9. The high current draw-out circuit breaker according to claim 1, characterized in that: The front end of the contact (111) is provided with concave features (1111) at the top and bottom for installing the short-circuit row (112).

10. The high current draw-out circuit breaker according to claim 1, characterized in that: The short-circuit bars (112) are connected to each other at the short sides.

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