Multi-channel arc extinguish chamber structure and frame circuit breaker using same

Abstract

The utility model discloses a multi-channel arc extinguish chamber structure and a frame circuit breaker with the same, the arc extinguish chamber structure comprises an arc extinguish chamber cover, arc extinguish chamber side shells and arc extinguish grid sheets, and an installation space is formed between the arc extinguish chamber side shells. A first gas production block, a second gas production block, N spacers made of insulation gas production materials and two arc striking pieces are further arranged in the installation space, the spacers are inserted into the arc extinguishing grid pieces from the bottom to form N + 1 strip-shaped spaces, and a plurality of sets of moving arc contacts are installed on the circuit breaker moving contact assembly. By means of the scheme, the problems that in the prior art, small-current electric arcs are not prone to being pushed into the arc extinguish chamber to be cut, and the electric arcs stay between the movable contacts and the static contacts, and contact points are prone to being damaged are solved. The technical effects of boosting to promote the small-current arc to quickly enter the arc extinguish chamber for arc extinguish and ensuring the on-off performance of the product are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical equipment components, in particular to a multi-channel arc extinguishing chamber structure and a universal frame circuit breaker using the structure. Background Art

[0002] Low-voltage circuit breakers, especially DC frame circuit breakers, are key equipment in new energy power distribution systems. The arc extinguishing ability of their arc extinguishing chambers directly affects their breaking capacity and determines the safety of the system's electricity use. When a short-circuit current is generated in a system with a breaking capacity of 100,000 amperes, the DC frame circuit breaker can cut off the line fault current in time to avoid further expansion of the fault. Since the arc extinguishing chamber of the DC frame circuit breaker uses air medium and grid cutting arcs to extinguish arcs, in the case of small currents, usually tens of amperes, the electric force generated by the current loop is insufficient to quickly push the arc into the arc extinguishing chamber for cutting, or even the arc does not enter the arc extinguishing chamber at all, and stays between the moving and static contacts and continues to burn, causing contact damage and affecting the performance of the circuit breaker. Severe cases can cause electrical fires and cause large losses. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides a multi-channel arc extinguishing chamber structure and a frame circuit breaker using the structure to solve the problems in the prior art that small current arcs are not easily pushed into the arc extinguishing chamber for cutting, and the arcs stay between the moving and static contacts, which easily causes contact damage.

[0004] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] A multi-channel arc extinguishing chamber structure, comprising an arc extinguishing chamber cover, an arc extinguishing chamber left shell, an arc extinguishing chamber right shell, and arc extinguishing grids, wherein the arc extinguishing chamber left shell and the arc extinguishing chamber right shell are fastened by horizontal screws on the side to form an installation space open up and down, the arc extinguishing chamber cover is installed on the top of the arc extinguishing chamber left shell and the arc extinguishing chamber right shell to cover the top of the installation space, the arc extinguishing grids are regularly arranged in the upper part of the installation space in the front-to-back direction to form an arc extinguishing grid group, the installation space also includes a first gas producing block, a second gas producing block, a number of N spacers made of insulating gas producing materials and two arc starting plates, N ≥ 1, the first gas producing block and the second gas producing block are respectively fastened by The components are installed on the left shell and the right shell of the arc extinguishing chamber and form a channel space therebetween. The partition is plugged into the arc extinguishing grid group from below to form N+1 separated front-to-back strip spaces between the bottom of the partition and the first gas producing block, the second gas producing block and the bottom of the partition. The two arc-starting plates are the first arc-starting plate and the second arc-starting plate. Each arc-starting plate includes an upper vertical plate portion and a lower horizontal plate portion. The first arc-starting plate and the second arc-starting plate are respectively plugged in front and behind the partition through the horizontal plate portion. The vertical plate portions of the first arc-starting plate and the second arc-starting plate are respectively installed at the front end of the front plate and the rear end of the rear end of the arc extinguishing grid group and are parallel to the arc extinguishing grid.

[0006] Preferably, each arc extinguishing grid of the arc extinguishing grid group has a second notch at the lower end, the partition has grooves at the upper end whose number is the same as the number of arc extinguishing grids in the arc extinguishing grid group, and the partition is inserted into the second notch of the arc extinguishing grid through the groove.

[0007] Preferably, the ends of the horizontal pieces of the arc-starting piece are evenly distributed with first notches which are the same number as the spacers, a first support is provided at the front of the spacer, and a second support is provided at the rear of the spacer, the first arc-starting piece is inserted in the front of the spacer and uses the rear of the first notch to support the first support of the spacer, and the second arc-starting piece is inserted in the rear of the spacer and uses the rear of the first notch to support the second support of the spacer.

[0008] Preferably, chamfers are provided at the connection parts between the first support and the second support on the lower sides of the groove groups on the front and rear sides of the spacer, and the horizontal sheet part and the vertical sheet part of the arc-starting sheet are connected with corresponding chamfered sections.

[0009] Preferably, the chamfer is a straight chamfer, and the chamfer section is an inclined chamfer section.

[0010] Preferably, a third notch is also formed at a portion above the strip-shaped space corresponding to the lower end of the arc-extinguishing grid.

[0011] Preferably, wings are extended downward on both sides of the arc extinguishing grid in the middle of the arc extinguishing grid group, and the wings are installed in the space formed by the first gas producing block, the second gas producing block, the left shell of the arc extinguishing chamber, and the right shell of the arc extinguishing chamber.

[0012] Preferably, a chamfered section is connected between the side surfaces and the bottom surfaces of the first gas producing block and the second gas producing block facing the inner side of the arc extinguishing chamber.

[0013] Based on the same inventive concept, the present application also uses the following scheme:

[0014] A frame circuit breaker comprises a moving contact assembly, a stationary contact assembly and the above-mentioned multi-channel arc extinguishing chamber structure, wherein the moving contact assembly and the stationary contact assembly are installed below the arc extinguishing chamber, a plurality of moving arc contacts are installed on the moving contact assembly, and the moving arc contacts are divided into different moving arc contact groups according to the number of strip spaces, and the ends of each group of moving arc contacts extend into the corresponding strip space and move in the strip space.

[0015] Preferably, the number of moving arc contacts in each group is two.

[0016] The present application proposes a multi-channel arc extinguishing chamber structure and a frame circuit breaker using the structure. The strip space formed between the partition and the gas generating block and the partition has both the effect of narrow gap pressurization, which promotes the arc to quickly enter the arc extinguishing chamber under the condition of small DC current; and can ensure the basic performance of the product after the large short-circuit current is interrupted. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a three-dimensional structure from an inner side perspective after the multi-channel arc extinguishing chamber structure of an embodiment of the present application is assembled;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the arc extinguishing chamber from the inner side of a longitudinal section of an embodiment of the multi-channel arc extinguishing chamber structure of the present application;

[0019] Figure 3 This is an exploded stereoscopic schematic diagram of an embodiment of a multi-channel arc extinguishing chamber of the present application;

[0020] Figure 4 This is a bottom view of a three-dimensional structure diagram of an embodiment of a multi-channel arc extinguishing chamber of the present application;

[0021] Figure 5 This is a bottom view of the internal assembly of an embodiment of a multi-channel arc extinguishing chamber of the present application;

[0022] Figure 6 A bottom perspective three-dimensional structural diagram of an embodiment of a multi-channel arc extinguishing chamber of the present application in which some arc extinguishing grids are omitted from the internal assembly;

[0023] Figure 7 This is a bottom view of a three-dimensional structure from another perspective of an embodiment of a multi-channel arc extinguishing chamber of the present application, in which all arc extinguishing grids are omitted from the internal assembly;

[0024] Figure 8 This is a schematic diagram of the three-dimensional structure of an embodiment of the arc-extinguishing grid of the present application;

[0025] Fig. 9 This is a schematic diagram of the three-dimensional structure of an embodiment of a spacer of the present application;

[0026] Fig.10 This is a schematic diagram of a three-dimensional structure of an assembly of a spacer and an arc-extinguishing grid according to an embodiment of the present application;

[0027] Among them, 1-arc extinguishing chamber, 11-first channel, 12-second channel, 13-spacer, 131-groove, 132-first support, 133-second support, 14a-first arc-striking plate, 14b-second arc-striking plate, 141-first notch, 15-arc extinguishing grid, 151-second notch, 152-third notch, 16-first gas producing block, 17-second gas producing block, 2-moving contact, 21-moving arc contact, 21a-first group of moving arc contacts, 21b-second group of moving arc contacts. DETAILED DESCRIPTION

[0028] 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.

[0029] The present embodiment provides a technical solution: the multi-channel arc extinguishing chamber structure of the utility model is a dual-channel arc extinguishing chamber structure, including an arc extinguishing chamber cover, an arc extinguishing chamber left shell, an arc extinguishing chamber right shell, and an arc extinguishing grid 15. The arc extinguishing chamber left shell and the arc extinguishing chamber right shell are fastened by horizontal screws on the side to form an installation space open up and down. The arc extinguishing chamber cover is installed on the top of the arc extinguishing chamber left shell and the arc extinguishing chamber right shell to cover the top of the installation space. The arc extinguishing grid 15 is regularly arranged in the front-to-back direction in the upper part of the installation space to form an arc extinguishing grid group. The installation space also includes a first gas producing block 16, a second gas producing block 17, and an insulating gas producing block made of an insulating gas producing material. A spacer 13 and two arc-starting plates are made of material, in this embodiment N=1, nylon is used for insulating gas production material, the first gas production block 16 and the second gas production block 17 are respectively installed on the left shell and the right shell of the arc extinguishing chamber by fasteners to form a channel space therebetween, the spacer 13 is plugged into the arc extinguishing grid group from below to form two separated front-to-back strip spaces below the spacer 13 and between the first gas production block 16, the second gas production block 17 and the spacer 13 below, the part of the arc extinguishing grid group above the two strip spaces is the first channel 11 and the second channel 12 separated by the spacer 13, if N spacers 13 are used, the arc extinguishing grid group is divided into N+1 channels.

[0030] The plug-in structure of the arc-extinguishing grid 15 and the spacer 13 can use any suitable method such as plug-in jack type, but these methods may require additional processing such as bending. In this embodiment, the simplest groove and notch structure is preferably adopted, that is, each arc-extinguishing grid 15 of the arc-extinguishing grid group is evenly distributed with a second notch 151 at the lower end, and the upper end of the spacer 13 is provided with grooves 131 with the same number as the arc-extinguishing grids 15 in the arc-extinguishing grid group, and the spacer 13 is plugged into the second notch 151 of the arc-extinguishing grid 15 through the groove 131.

[0031] The two arc-striking pieces are a first arc-striking piece 14a and a second arc-striking piece 14b, each of which includes an upper vertical piece portion and a lower horizontal piece portion, the first arc-striking piece 14a and the second arc-striking piece 14b are respectively inserted in front and behind the partition 13 through the horizontal piece portion, and the vertical piece portions of the first arc-striking piece 14a and the second arc-striking piece 14b are respectively installed at the front end of the front end piece and the rear end of the rear end piece of the arc-extinguishing grid group and are parallel to the arc-extinguishing grid 15.

[0032] Similarly, the arc-starting plate and the spacer 13 may be plugged in in other ways. The present embodiment preferably adopts the following method: a first notch 141 is provided at the end of the horizontal plate portion of the arc-starting plate, a first support 132 is provided at the front of the spacer 13, and a second support 133 is provided at the rear of the spacer 13. The first arc-starting plate 14a is plugged in at the front of the spacer 13 and uses the rear of the first notch 141 to support the first support 132 of the spacer 13. The second arc-starting plate 14b is plugged in at the rear of the spacer 13 and uses the rear of the first notch 141 to support the second support 133 of the spacer 13.

[0033] In order to fit the shape of other parts, chamfers are provided at the connecting parts between the first support 132 and the second support 133 on the lower sides of the grooves 131 on the front and rear sides of the spacer 13, and the horizontal sheet part and the vertical sheet part of the arc-starting sheet are connected with corresponding chamfer sections. The chamfer is a straight chamfer, and the chamfer section is an inclined chamfer section. Of course, arc chamfers and arc surface chamfer sections can also be used.

[0034] In order to reduce the resistance to the arc entering, a third notch 152 is formed at the lower end of the arc extinguishing grid 15 corresponding to the position above the strip-shaped space.

[0035] The arc extinguishing grids 15 in the arc extinguishing grid group may not be of the same shape. For installation and fixing considerations, wings are further extended downward on both sides of the arc extinguishing grid 15 in the middle of the arc extinguishing grid group in this embodiment, and the wings are installed in the space formed by the first gas production block 16 and the second gas production block 17 and the left shell and the right shell of the arc extinguishing chamber. A chamfered section is connected between the side surface and the bottom surface of the first gas production block 16 and the second gas production block 17 facing the inner side of the arc extinguishing chamber 1, and the chamfered section uses a straight chamfered section.

[0036] Based on the same inventive concept, the present application also discloses a universal frame circuit breaker. In this embodiment, the frame circuit breaker includes a moving contact assembly, a static contact assembly, and the above-mentioned dual-channel arc extinguishing chamber structure. The moving contact assembly and the static contact assembly are installed below the arc extinguishing chamber 1. Four moving arc contacts 21 are installed on the moving contact assembly. The moving arc contacts 21 are divided into two different moving arc contact groups according to the number of strip spaces in this embodiment. The ends of each group of moving arc contacts extend into the corresponding strip space and move in the strip space. The number of each group of moving arc contacts 21 is two. By increasing the number of moving arc contacts 21, the basic performance of the product can be guaranteed after a large short-circuit current is interrupted.

[0037] 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 operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0038] 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 multi-channel arc extinguishing chamber structure, comprising an arc extinguishing chamber cover, an arc extinguishing chamber left shell, an arc extinguishing chamber right shell, and an arc extinguishing grid (15), wherein the arc extinguishing chamber left shell and the arc extinguishing chamber right shell are fastened by horizontal screws on the side to form an installation space open up and down, the arc extinguishing chamber cover is installed on the top of the arc extinguishing chamber left shell and the arc extinguishing chamber right shell to cover the top of the installation space, and the arc extinguishing grids (15) are regularly arranged in the front-to-back direction in the upper part of the installation space to form an arc extinguishing grid group, characterized in that: The installation space also includes a first gas production block (16), a second gas production block (17), N spacers (13) made of insulating gas production materials, and two arc-starting plates, N≥1. The first gas production block (16) and the second gas production block (17) are respectively installed on the left shell and the right shell of the arc extinguishing chamber through fasteners to form a channel space between the two. The spacer (13) is plugged into the arc extinguishing grid group from below so that the bottom of the spacer (13) and the first gas production block (16), the second gas production block (17) and the bottom of the spacer (13) are connected. The invention relates to a spacer (13) having N+1 separated front-to-back strip spaces, wherein the two arc-striking pieces are a first arc-striking piece (14a) and a second arc-striking piece (14b), each arc-striking piece comprises an upper vertical piece portion and a lower horizontal piece portion, the first arc-striking piece (14a) and the second arc-striking piece (14b) are respectively inserted in front and behind the spacer (13) through the horizontal piece portion, and the vertical piece portions of the first arc-striking piece (14a) and the second arc-striking piece (14b) are respectively installed at the front end of the front piece and the rear end of the rear end of the arc-extinguishing grid piece group and are parallel to the arc-extinguishing grid piece (15).

2. The multi-channel arc extinguishing chamber structure according to claim 1, characterized in that: The lower end of each arc-extinguishing grid (15) of the arc-extinguishing grid group is uniformly provided with a second notch (151); the upper end of the spacer (13) is provided with grooves (131) whose number is the same as the number of arc-extinguishing grids (15) in the arc-extinguishing grid group; the spacer (13) is inserted into the second notch (151) of the arc-extinguishing grid (15) through the groove (131).

3. The multi-channel arc extinguishing chamber structure according to claim 1, characterized in that: The ends of the horizontal plate portion of the arc-starting plate are uniformly provided with first notches (141) having the same number as the spacer (13); the front portion of the spacer (13) is provided with a first support (132); the rear portion of the spacer (13) is provided with a second support (133); the first arc-starting plate (14a) is inserted into the front portion of the spacer (13) and uses the rear portion of the first notch (141) to support the first support (132) of the spacer (13); the second arc-starting plate (14b) is inserted into the rear portion of the spacer (13) and uses the rear portion of the first notch (141) to support the second support (133) of the spacer (13).

4. The multi-channel arc extinguishing chamber structure according to claim 1, characterized in that: The connecting parts of the grooves (131) on the front and rear sides of the spacer (13) and the first support (132) and the second support (133) are provided with chamfers, and the horizontal plate part and the vertical plate part of the arc-starting plate are connected with corresponding chamfer sections.

5. The multi-channel arc extinguishing chamber structure according to claim 4, characterized in that: The chamfer is a straight chamfer, and the chamfer section is an inclined chamfer section.

6. The multi-channel arc extinguishing chamber structure according to claim 1, characterized in that: A third notch (152) is also formed at the lower end of the arc extinguishing grid (15) at a position above the strip-shaped space.

7. The multi-channel arc extinguishing chamber structure according to claim 1, characterized in that: Wings are also extended downwards on both sides of the arc extinguishing grid (15) in the middle of the arc extinguishing grid group, and the wings are installed in the space formed by the first gas production block (16) and the second gas production block (17) and the left shell and right shell of the arc extinguishing chamber.

8. The multi-channel arc extinguishing chamber structure according to claim 7, characterized in that: A chamfered section is connected between the side surfaces and the bottom surfaces of the first gas generating block (16) and the second gas generating block (17) facing the inner side of the arc extinguishing chamber (1).

9. A frame circuit breaker, comprising a moving contact assembly and a stationary contact assembly, characterized in that: It also includes the multi-channel arc extinguishing chamber structure as described in any one of claims 1 to 8, wherein the moving contact assembly and the static contact assembly are installed below the arc extinguishing chamber (1), and a plurality of moving arc contacts (21) are installed on the moving contact assembly, and the moving arc contacts (21) are divided into different moving arc contact groups according to the number of strip spaces, and the ends of each group of moving arc contacts extend into the corresponding strip space and move in the strip space.

10. The multi-channel arc extinguishing chamber structure according to claim 9, characterized in that: The number of each group of moving arc contacts (21) is two.

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