Capacity-increasing type circuit breaker

Abstract

The utility model discloses a capacity-increasing type circuit breaker, which comprises a main body, a bottom plate arranged at the bottom of the main body and a cover body sleeved at the top of the main body, an arc extinguish chamber, a sealing block, a moving armature unit and a receding handle are correspondingly arranged in the main body; the arc extinguishing chamber is correspondingly provided with an arc extinguishing cover and an arc extinguishing grid plate; and a heat dissipation air channel is formed in the bottom of the main body. The utility model has the advantages that the cost is relatively low and the temperature rise is low.

Description

Technical Field

[0001] This utility model relates to the field of switchgear technology, and in particular to a capacity-enhancing circuit breaker. Background Technology

[0002] The market demand for high-current circuit breakers in the low-voltage molded case circuit breaker market is increasing. Currently, there are significant differences in the quality, performance, and price of high-current products in the low-voltage molded case circuit breaker market.

[0003] Existing high-current products are typically large in size and use too much material, which increases costs.

[0004] Furthermore, due to its large current carrying capacity, the temperature rises excessively, making it prone to problems. Utility Model Content

[0005] The purpose of this invention is to provide a capacity-enhancing circuit breaker. This invention has the advantages of relatively low cost and low temperature rise.

[0006] The technical solution of this utility model is as follows: a capacity-enhancing circuit breaker, comprising a main body, a base plate disposed at the bottom of the main body, and a cover sleeved on the top of the main body; the main body is provided with an arc-extinguishing chamber, a sealing block, a moving armature unit, and a clearance handle; the arc-extinguishing chamber is provided with an arc-extinguishing cover and an arc-extinguishing grid; the bottom of the main body is provided with a heat dissipation channel in a hollow shape.

[0007] In the aforementioned capacity-enhancing circuit breaker, the yielding handle passes through the cover, the bottom of the yielding handle is curved, and a snap-fit ​​groove corresponding to the moving armature unit is provided at the bottom of the yielding handle; a sealing step groove corresponding to the yielding handle is provided on the front side of the sealing block.

[0008] In the aforementioned capacity-enhancing circuit breaker, the arc-extinguishing grid has a downwardly bent arc-extinguishing section in the middle, which is inserted between the arc-extinguishing covers; the spacing between the arc-extinguishing covers is slightly larger than that between the contacts; and the arc-extinguishing covers are made of gas-generating material.

[0009] In the aforementioned capacity-enhancing circuit breaker, the moving armature unit includes an armature support and a moving armature plate; the moving armature plate is provided with a round protrusion that contacts the armature support.

[0010] In the aforementioned capacity-enhancing circuit breaker, the bottom of the main body is provided with evenly distributed sealing holes, and each sealing hole is provided with a detachable sealing plug; the middle part of the sealing plug is octagonal and the two sides are circular; the sealing plug is snapped together with the sealing hole, and the bottom end of the sealing plug is provided with a corresponding locking buckle.

[0011] In the aforementioned capacity-enhancing circuit breaker, the arc-extinguishing chamber is provided with a detachably connected arc-starting plate; the arc-starting plate has a plurality of uniformly distributed limiting protrusions for installation.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. By improving the bottom of the main body to provide heat dissipation channels, hot and cold air can convect and dissipate the generated heat, which can dissipate heat more quickly and reduce temperature rise.

[0014] 2. The bottom of the yielding handle is curved and its curvature is reduced. The corresponding sealing block is structurally adjusted and a sealing step groove corresponding to the yielding handle is set to achieve the yielding effect. Compared with the original hollow structure, it can further strengthen the seal and further prevent electric arc and particulate matter from flying into the mechanism chamber, thereby improving the stability of the mechanism. At the same time, the insulation is improved due to the reduction of particulate matter.

[0015] 3. The arc extinguishing chamber spacing is smaller than before, and the distance between it and the contacts is reduced, which can generate a narrow slit effect and quickly extinguish the arc; in addition, the arc extinguishing chamber uses gas-generating materials, which allows the arc to cool down faster and rapidly increase the gas pressure in the arc extinguishing chamber, which is more conducive to the extinction of the arc.

[0016] 4. The arc-extinguishing grid is provided with a downward-bent arc-extinguishing part, which quickly generates equipotential at the moment the moving contact opens, thereby accelerating the movement of the arc and rapidly transferring the arc root between the moving contact and the stationary contact, thus avoiding the ablation of the contact material.

[0017] 5. The moving armature piece is provided with a rounded protrusion, which makes point contact with the armature support. The contact area is reduced, the coefficient of friction is also reduced, the armature can move more quickly, thereby improving the stability of short circuit protection.

[0018] 6. A sealing hole is made at the bottom of the main body, and a sealing plug that is easy to disassemble is provided. The sealing plug is connected to the sealing hole with a snap-fit ​​structure, which is easy to disassemble and facilitates subsequent maintenance and installation. The sealing plug adopts an octagonal and round side mechanism, which is smooth and burr-free, and has a better sealing effect.

[0019] 7. Multiple limiting protrusions are set on the arc-guiding plate to facilitate alignment and installation, and make disassembly and assembly more convenient;

[0020] 8. Compared with large-capacity circuit breakers, this application eliminates the copper pad on the outgoing line board, reducing the amount of copper used; the base adopts a hollow design for heat dissipation, reducing the amount of material used; the half-section design of the handle also reduces the amount of material used; the overall cost is relatively low.

[0021] Therefore, this invention has the advantages of relatively low cost and low temperature rise. Attached Figure Description

[0022] Figure 1 This is an exploded view of this utility model;

[0023] Figure 2 This is a top view of the present invention;

[0024] Figure 3 This is a schematic diagram of the B-phase sealing structure of this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the sealing block of this utility model;

[0026] Figure 5 This is a schematic diagram of the arc-extinguishing chamber of this utility model;

[0027] Figure 6 This is a schematic diagram of the arc-extinguishing grid sheet of this utility model;

[0028] Figure 7 This is a structural schematic diagram of the moving armature unit of this utility model;

[0029] Figure 8 This is a schematic diagram of the structure of the moving armature piece of this utility model;

[0030] Figure 9 This is a schematic diagram of the structure of the yielding handle of this utility model;

[0031] Figure 10 This is a schematic diagram of the sealing structure of this utility model;

[0032] Figure 11 This is a schematic diagram of the rear structure of this utility model;

[0033] Figure 12 This is a schematic diagram of the structure of the arc-inducing plate of this utility model;

[0034] Figure 13 This is a schematic diagram of the heat dissipation air duct of this utility model.

[0035] The markings in the attached diagram are: 1-main body, 11-base plate, 12-sealing hole, 2-arc extinguishing chamber, 21-arc extinguishing cover, 22-arc extinguishing grid plate, 3-sealing block, 4-moving armature unit, 41-moving armature plate, 42-, 5-yielding handle, 6-cover, 7-arc ignition plate, 8-sealing. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0037] Example. A capacity-enhancing circuit breaker, such as... Figure 1-13 As shown, it includes a main body 1, a base plate 11 located at the bottom of the main body 1, and a cover 6 fitted onto the top of the main body 1; the main body 1 is provided with an arc-extinguishing chamber 2, a sealing block 3, a moving armature unit 4, and a clearance handle 5; the arc-extinguishing chamber 2 is provided with an arc-extinguishing cover 21 and an arc-extinguishing grid plate 22; the bottom of the main body 1 is hollowed out and has heat dissipation channels.

[0038] The yielding handle 5 passes through the cover 6, and the bottom of the yielding handle 5 is curved. The bottom of the yielding handle 5 has a snap-fit ​​groove corresponding to the moving armature unit 4. The front side of the sealing block 3 has a sealing step groove corresponding to the yielding handle 5.

[0039] The arc-extinguishing grid plate 22 has a downwardly bent arc-extinguishing part in the middle, and the arc-extinguishing part is inserted between the arc-extinguishing covers 21; the distance between the arc-extinguishing covers 21 is slightly larger than the contact; the arc-extinguishing cover 21 is made of gas-generating material.

[0040] The moving armature unit 4 includes an armature support and a moving armature plate 41; the moving armature plate 41 is provided with a round protrusion 42 that contacts the armature support.

[0041] The bottom of the main body 1 is provided with evenly distributed sealing holes 12, and each sealing hole 12 is provided with a detachable sealing plug 8; the middle part of the cross section of the sealing plug 8 is octagonal and the two sides are circular; the sealing plug 8 is snapped to the sealing hole 12, and the bottom end of the sealing plug 8 is provided with a corresponding locking buckle.

[0042] The arc-extinguishing chamber 2 is provided with a detachable arc-inducing plate 7; the arc-inducing plate 7 has a plurality of uniformly distributed limiting protrusions for installation.

[0043] The use of thickened and widened stationary contacts increases current carrying capacity, and the increased conductor width also increases the contact area with the external terminal block, thereby further reducing temperature rise.

[0044] Thickened and widened conductive components are used to increase current carrying capacity and thus reduce temperature rise.

[0045] By applying the improvements of this application to the original SGM6-800 molded case circuit breaker, it was found that its capacity was increased from the original 800A to 1000A.

Claims

1. A capacity-enhancing circuit breaker, characterized in that: It includes a main body (1), a base plate (11) at the bottom of the main body (1) and a cover (6) fitted on the top of the main body (1); the main body (1) is provided with an arc-extinguishing chamber (2), a sealing block (3), a moving armature unit (4) and a clearance handle (5); the arc-extinguishing chamber (2) is provided with an arc-extinguishing cover (21) and an arc-extinguishing grid plate (22); the bottom of the main body (1) is hollowed out and has a heat dissipation channel.

2. The capacity-enhancing circuit breaker according to claim 1, characterized in that: The yielding handle (5) passes through the cover (6), the bottom of the yielding handle (5) is curved, and the bottom of the yielding handle (5) is provided with a snap-fit ​​groove corresponding to the moving armature unit (4); the front side of the sealing block (3) is provided with a sealing step groove corresponding to the yielding handle (5).

3. The capacity-enhancing circuit breaker according to claim 1, characterized in that: The arc-extinguishing grid plate (22) has a downwardly bent arc-extinguishing part in the middle, and the arc-extinguishing part is inserted between the arc-extinguishing covers (21); the distance between the arc-extinguishing covers (21) is slightly larger than the contact; the arc-extinguishing covers (21) are made of gas-generating material.

4. The capacity-enhancing circuit breaker according to claim 1, characterized in that: The moving armature unit (4) includes an armature support and a moving armature plate (41); the moving armature plate (41) is provided with a round protrusion (42) that contacts the armature support.

5. A capacity-enhancing circuit breaker according to claim 1, characterized in that: The main body (1) has evenly distributed sealing holes (12) at its bottom, and each sealing hole (12) is provided with a detachable sealing plug (8); the middle part of the cross section of the sealing plug (8) is octagonal and the two sides are circular; the sealing plug (8) is snapped to the sealing hole (12), and the bottom end of the sealing plug (8) is provided with a corresponding locking buckle.

6. A capacity-enhancing circuit breaker according to claim 1, characterized in that: The arc-extinguishing chamber (2) is provided with a detachable arc-inducing plate (7); the arc-inducing plate (7) has a plurality of uniformly spaced limiting protrusions for installation.

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