Explosion-proof distribution box

Abstract

The utility model relates to the field of explosion-proof technology, in particular to an explosion-proof distribution box, which comprises an explosion-proof box body, an explosion-proof cover body and a hinge assembly, the explosion-proof box body and the explosion-proof cover body are rectangular, the explosion-proof box body comprises a first body and a first edge surrounding the outer wall of the first body, the first body is internally provided with a first cavity, and the first cavity is internally provided with a second cavity. The inner wall of the first body extends upwards to form an explosion-proof inner ring, the explosion-proof cover body comprises a second body and a second edge surrounding the outer wall of the second body, a second cavity is formed in the second body, and when the explosion-proof box body and the explosion-proof cover body are folded, the end face of the first edge is attached to the end face of the second edge, and the inner wall of the second body is attached to the outer wall of the explosion-proof inner ring; the explosion-proof distribution box provided by the utility model has the beneficial effect that the explosion-proof performance of the explosion-proof distribution box is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of explosion-proof, in particular to an explosion-proof distribution box. Background Art

[0002] Explosion-proof electrical appliances refer to a type of electrical equipment used in places where there are explosive gases and steam. Various explosive gases and steam are often encountered in chemical production. In places where these media are present, it is an important measure to ensure safe production and prevent explosions and fires by correctly selecting appropriate explosion-proof electrical appliances in accordance with relevant specifications, standards and regulations to prevent the explosion of the surrounding explosive mixture.

[0003] The utility model patent with patent number CN220233878U in the prior art discloses an explosion-proof and corrosion-resistant power distribution device, including an explosion-proof box and an explosion-proof cover, both of which are made of plastic material, and the fitting surface between the explosion-proof box and the explosion-proof cover is provided with two metal explosion-proof layers corresponding to each other, and the metal explosion-proof layers are fixed on the fitting surfaces at both ends of the explosion-proof box and the explosion-proof cover by a compression molding process, and the end surfaces of the metal explosion-proof layers that are fitted to each other are explosion-proof surfaces.

[0004] The above-mentioned power distribution device has the following disadvantages in actual use: 1. The explosion-proof box and the explosion-proof cover are fitted to each other, and the fitted end face is a flameproof surface. The power distribution device with such a flameproof surface belongs to Class IIB. IIB is suitable for non-lethal gas environments of ethane and contraction. Since its explosion-proof level is too low, it cannot be used in gas environments with hydrogen, acetylene and carbon disulfide, that is, it does not belong to Class IIC; 2. There are several dividing strips at the bottom of the inner cavity of the explosion-proof box. When installing electrical appliances in the explosion-proof box, it is necessary to place an additional mounting plate. As shown in the utility model with patent number CN217607268U, placing the mounting bottom plate makes the bottom of the inner cavity of the explosion-proof box flat, increases the contact area with the electrical appliances, and thus improves the heat dissipation performance. The additional installation bottom plate increases the number of components, making assembly and production more complicated; 3. The bottom of the outer wall of the explosion-proof box is a smooth plane. In order to ensure the explosion-proof performance of the explosion-proof box, it is necessary to ensure the bottom thickness. Since the bottom is a smooth plane, the bottom thickness is uniform, which leads to low heat dissipation performance of the explosion-proof box. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide an explosion-proof distribution box in view of the deficiencies of the above-mentioned prior art.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an explosion-proof distribution box, comprising an explosion-proof box body, an explosion-proof cover body and a hinge assembly, wherein the explosion-proof box body and the explosion-proof cover body are both rectangular, the explosion-proof box body comprises a first body and a first edge surrounding the outer wall of the first body, a first chamber is provided in the first body, the inner wall of the first body extends upward to form a flameproof inner ring, the first body, the first edge and the flameproof inner ring are integrally formed, the explosion-proof cover body comprises a second body and a second edge surrounding the outer wall of the second body, the second body has a second chamber, the end face of the second edge facing the side of the explosion-proof box body is kept flush with the end face of the second body facing the side of the explosion-proof box body, the second body and the second edge are integrally formed, when the explosion-proof box body and the explosion-proof cover body are closed, the end face of the first edge is in contact with the end face of the second edge, the inner wall of the second body is in contact with the outer wall of the flameproof inner ring, and the first chamber and the second chamber form a flameproof cavity.

[0007] The utility model with the above characteristics: the explosion-proof box body and the explosion-proof cover body are arranged in a rectangular shape, and the explosion-proof cavity formed by the two when they are closed is also rectangular. Compared with the circular explosion-proof cavity of the same area, the rectangular explosion-proof cavity can accommodate more circuit breakers, thereby reducing the number of explosion-proof distribution boxes used; a flameproof inner ring is arranged on the explosion-proof box body, so that when the explosion-proof box body and the explosion-proof cover body are closed, the inner wall of the second body is in contact with the outer wall of the flameproof inner ring, and the part where the second body and the flameproof inner ring are in contact forms a flameproof surface. Compared with the flameproof surface formed by the end face of the explosion-proof box body and the explosion-proof cover body in the background technology, the setting of the flameproof inner ring has a sealing effect on the contact point between the first edge and the second edge, which can prevent the sparks generated by the explosion from directly drilling into the outside world, and the flameproof inner ring is in contact with the second body, so that sparks cannot drill out from between the two, thereby improving the flameproof performance and making the explosion-proof distribution box meet the ⅡC standard.

[0008] The utility model is further configured as follows: an inwardly recessed annular groove is provided on the inner wall of the second body, the annular groove is located at the open end of the second body, a step surface is formed between the groove bottom of the annular groove and the inner wall of the second body, and an assembly gap is left between the step surface and the end face of the flameproof inner ring.

[0009] The utility model with the above characteristics: the explosion-proof cover body is made by die-casting, and the roughness of its inner wall cannot meet the requirements. The requirements for the roughness of the inner wall are met by additional milling of an annular groove; an assembly gap is left between the bottom of the annular groove and the explosion-proof inner ring to ensure that the explosion-proof cover body can be covered on the explosion-proof box body.

[0010] A further configuration of the utility model is that the width of the flameproof inner ring is greater than or equal to 25 mm.

[0011] The utility model with the above characteristics: the width of the explosion-proof inner ring determines the size of the explosion-proof surface area. If the width of the explosion-proof inner ring is less than 25mm, its explosion-proof effect cannot meet actual needs and the explosion-proof performance is poor. Only when the width of the explosion-proof inner ring is greater than or equal to 25mm can the explosion-proof effect be met.

[0012] A further configuration of the utility model is that the surface matching dimension between the outer wall of the flameproof inner ring and the inner wall of the second body is less than 0.15 mm.

[0013] The utility model with the above-mentioned characteristics: when an explosion occurs in the explosion-proof cavity, the generated sparks will drill out from the gap between the outer wall of the explosion-proof inner ring and the inner wall of the second body. In order to prevent the sparks from leaking out, the gap between the outer wall of the explosion-proof inner ring and the inner wall of the second body is controlled within 0.15mm, which can prevent the sparks from leaking out and ensure the explosion-proof performance of the explosion-proof distribution box.

[0014] A further configuration of the utility model is that the surface roughness between the outer wall of the flameproof inner ring and the inner wall of the second body is less than or equal to 3.2 μm.

[0015] The utility model with the above characteristics: when the surface roughness of the two is less than or equal to 3.2, the smoothness of the contact surface is guaranteed, so that the two fit more closely, which can effectively prevent gas leakage and ensure the explosion-proof effect; the smooth surface helps to improve the heat conduction efficiency and helps to dissipate heat from the box.

[0016] A further configuration of the utility model is that: a plurality of reinforcing ribs evenly distributed along the length direction are provided at the bottom of the outer periphery of the first body, and the length of the reinforcing ribs is kept the same as the width of the first body.

[0017] The utility model with the above-mentioned features can reduce the thickness of the bottom of the first body by arranging reinforcing ribs at intervals at the bottom of the first body, thereby enhancing the heat dissipation performance of the explosion-proof box.

[0018] A further configuration of the utility model is that the bottom of the first chamber is a flat plane on which a plurality of evenly distributed assembly holes are provided, an assembly hole reinforcement block is provided at the bottom of the outer periphery of the first body corresponding to the assembly hole, one end of the assembly hole extends toward the assembly hole reinforcement block, the height of the assembly hole reinforcement block is kept the same as the height of the reinforcement rib, and the two are integrally formed.

[0019] The utility model with the above-mentioned characteristics: the bottom of the first chamber is directly set as a flat plane, without the need to additionally set up a mounting base plate, thereby reducing the number of components, improving assembly efficiency and production efficiency, and reducing production costs; an assembly hole reinforcement block adapted to the assembly hole is set at the bottom of the first body to enhance the connection strength when the electrical appliance is connected to the assembly hole.

[0020] A further configuration of the utility model is that: a plurality of mounting holes for bolts to pass through are evenly distributed on the second edge, a connecting hole reinforcement block is provided at the lower end surface of the first edge corresponding to the mounting holes, a connecting hole adapted to the mounting holes is provided in the connecting hole reinforcement block, and the explosion-proof box body and the explosion-proof cover body are connected by bolts.

[0021] The utility model with the above-mentioned characteristics: by arranging a connection hole reinforcement block at the lower end of the first edge for installing bolts, the connection strength and stability of the bolts are improved without increasing the overall thickness of the first edge, and at the same time, the force on the bolts is effectively dispersed, reducing the stress concentration caused by uneven force, thereby improving the connection strength between the explosion-proof box body and the explosion-proof cover body.

[0022] The utility model is further configured as follows: a plurality of evenly arranged reinforcing ribs are provided on the inner wall of the first body in the length direction, the head end of the reinforcing rib is flush with the end of the flameproof inner ring, and the tail end is connected to the bottom of the first body.

[0023] The utility model with the above characteristics: by arranging reinforcing ribs on the inner wall of the first body, the overall strength of the first chamber is improved, the stress distribution in the first chamber is made more uniform, so that it can withstand a greater load and prevent deformation or damage caused by internal electrical explosion.

[0024] A further configuration of the utility model is that the explosion-proof box and the explosion-proof cover are both made of aluminum alloy.

[0025] The utility model with the above characteristics adopts aluminum alloy material to make the explosion-proof box body and the explosion-proof cover body, thereby enhancing the overall explosion-proof performance.

[0026] The utility model is further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of an embodiment of the utility model.

[0028] Figure 2 The structure of the explosion-proof box of the utility model embodiment is shown in FIG. Figure 1 .

[0029] Figure 3 It is a schematic structural diagram of the explosion-proof cover body of an embodiment of the utility model.

[0030] Figure 4 It is a cross-sectional view of an embodiment of the utility model.

[0031] Figure 5 The structure of the explosion-proof box of the utility model embodiment is shown in FIG. Figure 2 .

[0032] Figure 6 It is a schematic diagram of sparks in the explosion-proof chamber when an embodiment of the utility model explodes. DETAILED DESCRIPTION

[0033] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0034] like Figure 1-5 The explosion-proof distribution box shown in the figure includes an explosion-proof box body 1, an explosion-proof cover body 2 and a hinge assembly 5. The explosion-proof box body 1 and the explosion-proof cover body 2 are both made of aluminum alloy. The explosion-proof box body 1 and the explosion-proof cover body 2 are both rectangular. The explosion-proof box body 1 includes a first body 11 and a first edge 12 surrounding the outer wall of the first body 11. The first body 11 has a first chamber 13, and the inner wall of the first body 11 extends upward to form a flameproof inner ring 15. The first body 11, the first edge 12 and the flameproof inner ring 15 are integrally formed. The inner wall of the first body 11 in the length direction is provided with a plurality of uniformly arranged reinforcing ribs 17. The head end of the reinforcing rib 17 is flush with the end of the flameproof inner ring, and the end is connected to the bottom of the first body 11. The bottom of the outer periphery of the first body 11 is provided with a plurality of reinforcing ribs 18 uniformly distributed along its length direction. The length of the reinforcing rib 18 is the same as the width of the first body 11. The bottom of the first chamber 13 is A flat plane is provided with a plurality of evenly distributed assembly holes 19, an assembly hole reinforcement block 10 is provided at the bottom of the outer periphery of the first body 11 corresponding to the assembly hole 19, one end of the assembly hole 19 extends toward the assembly hole reinforcement block 10, the height of the assembly hole reinforcement block 10 is kept the same as the height of the reinforcing rib 18, and the two are integrally formed, the explosion-proof cover body 2 includes a second body 21 and a second edge 22 surrounding the outer wall of the second body 21, the second body 21 has a second chamber 23, the end face of the second edge 22 facing the explosion-proof box body 1 is kept flush with the end face of the second body 21 facing the explosion-proof box body 1, the second body 21 and the second edge 22 are integrally formed, when the explosion-proof box body 1 and the explosion-proof cover body 2 are closed, the end face of the first edge 12 is in contact with the end face of the second edge 22, the inner wall of the second body 21 is in contact with the outer wall of the explosion-proof inner ring 15, and the first chamber 13 and the second chamber 23 form a flameproof chamber 14.

[0035] An inwardly recessed annular groove 211 is provided on the inner wall of the second body 21, and the annular groove 211 is located at the open end of the second body 21. A step surface 212 is formed between the groove bottom of the annular groove 211 and the inner wall of the second body 21, and an assembly gap 16 is left between the step surface and the end face of the flameproof inner ring 15. The width of the flameproof inner ring 15 is greater than or equal to 25 mm, the surface matching dimension between the outer wall of the flameproof inner ring 15 and the inner wall of the second body 21 is less than 0.15 mm, and the surface roughness between the outer wall of the flameproof inner ring 15 and the groove wall of the annular groove 211 is less than or equal to 3.2 μm.

[0036] A plurality of mounting holes 221 for the bolts 4 to pass through are evenly distributed on the second edge 22, a connecting hole reinforcement block 121 is provided at the lower end surface of the first edge 12 corresponding to the mounting holes 221, a connecting hole 1211 adapted to the mounting holes 221 is provided in the connecting hole reinforcement block 121, and the explosion-proof box body 1 and the explosion-proof cover body 2 are connected by bolts 4.

[0037] like Figure 6 As shown, when the electrical appliances in the explosion-proof distribution box explode, sparks and high temperatures will be generated. The outer wall of the explosion-proof inner ring and the inner wall of the second body are attached to form a flameproof surface. The flameproof surface has the function of blocking the sparks from spilling out and cooling the high temperature to avoid the occurrence of explosion accidents. In addition, the explosion-proof distribution box belongs to Class IIC and is suitable for gas environments with hydrogen, acetylene and carbon disulfide.

Claims

1. An explosion-proof distribution box, comprising an explosion-proof box body, an explosion-proof cover body and a hinge assembly, characterized in that: The explosion-proof box and the explosion-proof cover are both rectangular, the explosion-proof box includes a first body and a first edge surrounding the outer wall of the first body, the first body has a first chamber, the inner wall of the first body extends upward to form a flameproof inner ring, the first body, the first edge and the flameproof inner ring are integrally formed, the explosion-proof cover includes a second body and a second edge surrounding the outer wall of the second body, the second body has a second chamber, the end face of the second edge facing the explosion-proof box side is kept flush with the end face of the second body facing the explosion-proof box side, the second body and the second edge are integrally formed, when the explosion-proof box and the explosion-proof cover are closed, the end face of the first edge is in contact with the end face of the second edge, the inner wall of the second body is in contact with the outer wall of the flameproof inner ring, the first chamber and the second chamber form a flameproof cavity, and the bottom of the outer periphery of the first body is provided with a plurality of reinforcing ribs evenly distributed along its length direction, and the length of the reinforcing ribs is kept the same as the width of the first body.

2. An explosion-proof distribution box according to claim 1, characterized in that: The inner wall of the second body is provided with an inwardly recessed annular groove, the annular groove is located at the open end of the second body, a step surface is formed between the groove bottom of the annular groove and the inner wall of the second body, and an assembly gap is left between the step surface and the end face of the flameproof inner ring.

3. An explosion-proof distribution box according to claim 1 or 2, characterized in that: The width of the flameproof inner ring is greater than or equal to 25 mm.

4. An explosion-proof distribution box according to claim 1 or 2, characterized in that: The surface matching dimension between the outer wall of the flameproof inner ring and the inner wall of the second body is less than 0.15 mm.

5. An explosion-proof distribution box according to claim 1 or 2, characterized in that: The surface roughness between the outer wall of the flameproof inner ring and the inner wall of the second body is less than or equal to 3.2 μm.

6. The explosion-proof distribution box according to claim 1, characterized in that: The bottom of the first chamber is a flat plane on which a plurality of evenly distributed assembly holes are provided. An assembly hole reinforcement block is provided at the bottom of the outer periphery of the first body corresponding to the assembly hole. One end of the assembly hole extends toward the assembly hole reinforcement block. The height of the assembly hole reinforcement block is the same as the height of the reinforcement rib, and the two are integrally formed.

7. An explosion-proof distribution box according to claim 1, characterized in that: The second edge is evenly distributed with a plurality of mounting holes for bolts to pass through, a connection hole reinforcement block is provided at the lower end surface of the first edge corresponding to the mounting holes, a connection hole matching the mounting holes is provided in the connection hole reinforcement block, and the explosion-proof box body and the explosion-proof cover body are connected by bolts.

8. The explosion-proof distribution box according to claim 1, characterized in that: The inner wall of the first body in the length direction is provided with a plurality of evenly arranged reinforcing ribs, the head end of the reinforcing rib is flush with the end of the flameproof inner ring, and the tail end is connected to the bottom of the first body.

9. An explosion-proof distribution box according to claim 1 or 2, characterized in that: The explosion-proof box and the explosion-proof cover are both made of aluminum alloy.

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