Novel explosion-proof distribution box

Abstract

The invention discloses a novel explosion-proof distribution box comprising a junction box bottom shell, a junction box cover, an explosion-proof bottom shell and an explosion-proof shell cover, wherein a threaded explosion-proof jointing surface is arranged for connecting the explosion-proof bottom shell and the explosion-proof shell cover; a modular turnoff bracket is arranged at one side of the explosion-proof bottom shell and is provided with a switch mechanism; and a modular handle is arranged at one side of the explosion-proof shell cover and is provided with a pulling shaft operation mechanism. The novel explosion-proof distribution box has the benefits that parts can be machined simply, the explosion-proof performance is reliable, the production efficiency is improved; and the equipment cost is reduced, the management cost is reduced, and the usage of metal resources is reduced.

Description

technical field [0001] The invention relates to a distribution box, in particular to a novel explosion-proof distribution box. Background technique [0002] At present, the known flameproof explosion-proof distribution box device is mainly composed of flameproof cover, flameproof bottom shell, lighting or power switch, switch operating mechanism, flameproof shaft, handle, flameproof joint surface and other structures. Its disadvantages mainly include the following points: [0003] 1. The opening direction of the cover of the well-known Class II Class C explosion-proof explosion-proof distribution box is vertical opening. The maximum gap between the joint surface (that is, the maximum value of the difference between the inner and outer diameters of the two cylindrical surfaces) is required to be less than 0.15mm, and the joint length of the flameproof joint surface in the axial direction (in the direction of opening the cover) is greater than 25mm, and the surface roughness ...

AI Technical Summary

Problems solved by technology

[0003] 1. The opening direction of the cover of the well-known Class II Class C explosion-proof explosion-proof distribution box is vertical opening. The maximum gap between the joint surface (that is, the maximum value of the difference between the inner and outer diameters of the two cylindrical surfaces) is required to be less than 0.15mm, and the joint length of the flameproof joint surface in the axial direction (in the direction of opening the cover) is greater than 25mm, and the surface roughness of the two flameproof joint surfaces Ra is required to be kept between 3.2-6.3, and the surface of the joint surface is not allowed to be bumped and scratched. After the joint surface is bumped and scratched, the explosion-proof performance will be affected, and the scratches may even cause the product to lose the explosion-proof performance

The explosion-proof joint surface requires a depth of more than 25mm, and the flameproof joint surface clearance is required to be less than 0.15mm to meet the requirements of the explosion-proof standard. This causes the existing explosion-proof distribution box products to It is very laborious and must be carefully opened or fastened vertically. If the direction of axial force is not well controlled, the cover will be stuck on the shell. Excessive force will damage the cylinder or the flameproof joint surface of the mouth, resulting in failure of the flameproof joint surface. , if the flameproof joint surface fails, when an explosion occurs inside the explosion-proof distribution box, the internal spark may be transmitted to the explosive gas environment outside the explosion-proof distribution box, which may easily cause an explosion accident

[0004] 2. It is difficult to effectively guarantee the maximum gap of 0.15mm for the current explosion-proof explosion-proof distribution box products in the actual production, whether it is a planar structure II class A, B level equipment, or a cylinder and a stop Class II Class C equipment with port structure is prone to deformation due to force or heat during processing or painting of the shell. The gap value is quite different, and the product quality is not stable

[0005] 3. If the explosion-proof gap between the flameproof bottom shell and the flameproof cover is too small during the production and assembly of the current Class II Class C explosion-proof distribution box equipment, it is very difficult to buckle and open, and it is easy to open if the flameproof gap is too large. Some, but the gap between the joint surfaces does not meet the explosion-proof requirements

The use of multiple bolts to fasten the structure results in long working hours and low efficiency for processing, assembly and maintenance, high material consumption and waste of resources, which is not in line with the resource conservation policy advocated by our country.

[0007] 4. When the current Class II Class A, B, and C explosion-proof explosion-proof distribution boxes are equipped with switches inside the explosion-proof housing, the plastic operating handle on the switch must be aligned with the special metal mechanism on the explosion-proof cover to buckle the explosion-proof The explosion-proof cover of the distribution box, because the switch is set on the bottom plate of the explosion-proof shell, the mechanism is installed on the flame-proof cover, and the mechanism on the cover is a random sliding or rotating mechanism without working position restrictions. If the circuit breaker in the shell is assembled The mechanism on the handle and the cover deviates, and the mechanism on the cover will be stuck on the handle of the circuit breaker, causing the mechanism to fail or the cover cannot be fastened at all. In addition, the existing mechanism requires a large number of parts to be assembled one by one, and the assembly time is long. higher requirements

Therefore, the current explosion-proof distribution box device has disadvantages such as backward switch mechanism, many switch mechanism parts, long assembly man-hours, high workshop management costs, and large differences in the quality of the switch mechanism due to different assembly operators and many safety hazards.

Moreover, it is also difficult to perform on-site maintenance or replace switches and mechanism parts for the existing explosion-proof distribution box equipment

[0008] 5. When the current explosion-proof distribution box device is used in an explosive gas environment, there is a lack of safety measures to ensure that the cover can only be opened after the power is cut off. Only a warning sign board is set on the equipment that strictly prohibits opening the cover with electricity, and it can only be opened after the power is not cut off. The mechanical interlocking measures of the cover, if the operator opens the cover of the explosion-proof distribution box with electricity without knowing it, and the live conductor is exposed to the explosive gas environment, it is easy to cause a serious explosion accident

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