Frame-type high-strength explosion-proof housing and processing method thereof

Abstract

The invention relates to the technical field of electrical element assemblies, and discloses a frame-type high-strength explosion-proof shell and a processing method thereof.The frame-type high-strength explosion-proof shell comprises an upper cover body and a lower box body which are rotationally connected, the upper cover body is used for closing the lower box body, and the lower box body comprises a main box body which is provided with a bottom plate and an outer frame arranged on the periphery of the bottom plate; the outer frame comprises four side plates which are connected end to end, and the top ends of the four side plates surround to form an open end; the first flange connecting frame is used for being connected with the upper cover body; the first main beam is arranged in the middle of the bottom plate and extends in the width direction of the bottom plate; the second main beam is arranged on the side plate in the length direction and extends in the height direction of the side plate; the third main beam is arranged in the first flange connecting frame and extends in the width direction of the first flange connecting frame; the first main beam, the second main beam and the third main beam correspond in position and define a closed frame structure. The problem that a large-size explosion-proof shell is prone to deformation is solved, and the engineering goals of light weight and low cost are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of electrical component assemblies, in particular to a frame-type high-strength flameproof enclosure and a processing method thereof. Background Art

[0002] Flameproof enclosure is an explosion-proof measure in explosion-proof electrical equipment. By strengthening the mechanical structure of the equipment enclosure, it ensures that the equipment itself does not become the source of explosion in an explosive environment. The basic principle is to set a solid enclosure between the inside and outside of the equipment. When the electrical components in the equipment are working, the energy generated (such as electric sparks, arcs, high temperatures, etc.) ignites the explosive gas or steam inside the equipment. The enclosure can withstand the explosion pressure, the equipment enclosure will not be damaged, and can prevent the flame from extinguishing itself when passing through the flameproof surface, preventing the flame from spreading outward, and is used to prevent the internal explosion from triggering a chain explosion in the external environment.

[0003] For example, the shell of a mini explosion-proof junction box for fire fighting disclosed in patent number CN213125477U includes a shell and a base, and a rectangular flange ring is arranged at the opening of the box body. This type of explosion-proof shell uses steel plates of the same thickness or different thicknesses. Under the premise of the same explosion pressure, the closer the bottom is to the middle, the greater the pressure is, and the easier it is for the product to deform. When the box body is large, the middle position of the flange is also more likely to deform. If a very thick material must be used to ensure that the middle is not deformed, the surrounding material will be wasted, and the weight of the shell will be increased. In addition, the pressure generated during the explosion will cause the flange to deform to a certain extent. When the spacing between the screws on the flange is not appropriate, it will be difficult to ensure that the flame generated by the internal explosion is extinguished, thereby causing an external explosion. Summary of the invention

[0004] The object of the present invention is to provide a frame-type high-strength flameproof enclosure to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a frame-type high-strength flameproof enclosure, comprising an upper cover body and a lower box body that are rotatably connected, wherein the upper cover body is used to close the lower box body, and the lower box body comprises: A main box body, the main box body having a bottom plate and an outer frame arranged around the bottom plate, the outer frame comprising four side plates connected end to end, the top ends of the four side plates surrounding each other to form an open end; A first flange connection frame is arranged around the open end and is used to connect with the upper cover body; A main beam 1, arranged in the middle of the bottom plate and extending along the width direction of the bottom plate; The second main beam is arranged on the side plate in the length direction and extends along the height direction of the side plate; A main beam three, arranged in the first flange connection frame and extending along the width direction of the first flange connection frame; Among them, the positions of the main beam one, the main beam two and the main beam three correspond to each other and together form a closed frame structure.

[0006] Furthermore, each of the side panels is also provided with a plurality of reinforcing ribs, and the reinforcing ribs extend along the height direction of the side panels and are connected to the first flange connection frame.

[0007] Furthermore, each of the side panels is provided with a plurality of mounting holes, and the mounting holes are used to connect the flameproof sleeve, and there is no interference between the flameproof sleeve and the reinforcing ribs.

[0008] Furthermore, at least two first internal ribs are arranged on the bottom plate, the first internal ribs extend along the length direction of the bottom plate and are staggered with the main beam, and second internal ribs are arranged between the first internal ribs and the adjacent side plates, and the second internal ribs are parallel to the width direction of the bottom plate.

[0009] Furthermore, at least two mounting plates are provided below the main box body, the mounting plates are parallel to the width direction of the bottom plate and both ends extend to the outside of the bottom plate, and a single mounting plate is connected to a single reinforcing rib corresponding to the position.

[0010] Furthermore, a plurality of first arc-shaped ribs are arranged between the first flange connection frame and the side plate.

[0011] Furthermore, the upper cover body includes a main cover plate and a second flange connection frame arranged around the end of the main cover plate, the second flange connection frame is matched and connected to the first flange connection frame, and a second arc rib is arranged between the main cover plate and the second flange connection frame.

[0012] Furthermore, a plurality of reinforcing plates are arranged inside the main cover plate, and the reinforcing plates extend along the width direction of the main cover plate.

[0013] Furthermore, the first flange connection frame and the second flange connection frame are both provided with a plurality of connection holes, and the spacing between the connection holes close to the center line is smaller than the spacing between the connection holes far from the center line, and the center line is the center line of the first flange connection frame or the second flange connection frame.

[0014] And, a processing method including the above frame-type high-strength flameproof enclosure, comprising the following steps: S10: Determine the structure and size of the flameproof enclosure and the type and size of the cable according to the electrical components installed inside, determine the position, size and quantity of the flameproof sleeve according to the type and size of the cable, perform three-dimensional modeling, perform finite element analysis on the model, and adjust the structure of the lower box body and the upper cover body accordingly; S20: According to the model that meets the requirements of finite element analysis, corresponding parts are manufactured and welded. The welding process includes: S21: The first flange connection frame is welded and formed, and the main beam 3 is welded to the first flange connection frame; S22: The bottom plate and the side plate are welded to form the main box body; S23: placing the first flange connection frame on the main box body, welding the first main beam and the second main beam, and welding and fixing the first flange connection frame to the main box body; S24: welding the reinforcing ribs, the first arc ribs, the mounting plate, the first inner ribs, the second inner ribs and the flameproof sleeve on the main box body to complete the welding; S25: Perform vibration aging treatment on the welded flameproof enclosure, and then process and form the connection holes on the first flange connection frame.

[0015] The present invention has the following beneficial effects: The present invention forms a rigid support system through a frame-type structural design to solve the problem of easy deformation of large-sized explosion-proof enclosures and ensure the integrity of the enclosure during an explosion. Through innovative mechanical structure, material optimization and process improvement, while ensuring high explosion-proof performance, the engineering goals of lightweight and low cost are achieved. The invention is particularly suitable for large-scale explosion-proof operations in high-risk fields such as chemical and petroleum.

[0016] The present invention forms a U-shaped frame through the main beams one, two and three, which ensures that the middle position will not be deformed during an explosion, improves the deformation resistance of the middle area, thereby reducing the thickness of the steel plate used in the lower box body, saving costs and reducing the overall weight.

[0017] The present invention ensures that the bottom and four walls are not deformed during explosion through the structure of the reinforcing ribs, the first inner ribs and the second inner ribs, avoids deformation of the flameproof sleeve and ensures the installation of the cable introduction device.

[0018] The present invention ensures that the gap between the first flange connection frame and the main box body does not increase during an explosion through the structure of the first arc rib. At the same time, the spacing between the connection holes in the middle position is smaller than the spacing between the connection holes at the two side positions, that is, the density of the screws in the middle position is greater, ensuring that the gap between the explosion-proof surface of the upper cover body and the lower box body does not increase during an explosion.

[0019] The present invention determines structural weak points through finite element analysis to achieve precise strengthening, eliminates welding stress through vibration aging treatment, and improves structural stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 This is an overall three-dimensional schematic diagram of the frame-type high-strength flameproof enclosure in Example 1; Figure 2 for Figure 1 A three-dimensional schematic diagram from another perspective; Figure 3 for Figure 1 An enlarged three-dimensional schematic diagram of the lower box; Figure 4 for Figure 1 A top view schematic diagram of the lower box; Figure 5 for Figure 1 An enlarged schematic diagram of an upper cover body; Figure 6 It is a schematic diagram of finite element analysis of the frame-type high-strength flameproof enclosure in Example 1; Figure 7 It is a schematic diagram of the finite element analysis of the flameproof enclosure in Comparative Example 1; Figure 8 This is a schematic diagram of the finite element analysis of the flameproof enclosure in Comparative Example 2.

[0022] Reference numerals: Upper cover body 10, main cover plate 11, second flange connection frame 12, second arc rib 101, reinforcing plate 111, connection hole 100; Lower box 20, bottom plate 211, side plate 212, first flange connection frame 22, main beam 1 23, main beam 24, main beam 3 25, reinforcing rib 26, flameproof sleeve 27, first inner rib 281, second inner rib 282, mounting plate 29, first arc rib 201; Hinge 31, screw 32. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] like Figure 1-Figure 2As shown, a frame-type high-strength flameproof enclosure in this embodiment is mainly composed of an upper cover body 10 and a lower box body 20. The upper cover body 10 and one end of the lower box body 20 are rotatably connected by a hinge 31, so that the upper cover body 10 can close or open the lower box body 20 by flipping.

[0025] Combination Figure 3-Figure 4 As shown, the lower box body 20 is mainly composed of a main box body, a first flange connection frame 22, a main beam 1 23, a main beam 24, a main beam 3 25, a reinforcing rib 26, a flameproof sleeve 27, a first inner rib 281, a second inner rib 282, a mounting plate 29, and a first arc rib 201.

[0026] Among them, the main box body has a bottom plate 211 and an outer frame arranged around the bottom plate 211, the outer frame includes four side plates 212 connected end to end, the top ends of the four side plates 212 are surrounded to form an open end, forming an open square box structure, a first flange connection frame 22, which is arranged around the open end and is used to connect with the upper cover body 10, a main beam 1 23 is arranged in the middle of the bottom plate 211 and extends along the width direction of the bottom plate 211, a main beam 24 is arranged on the two side plates 212 in the length direction and extends along the height direction of the side plates 212, and a main beam 3 25 is arranged in the first flange connection frame 22 and extends along the width direction of the first flange connection frame 22. Therefore, the positions of the main beam 1 23, the main beam 24 and the main beam 3 25 correspond to each other, and are roughly connected end to end in the middle position of the length direction of the main box body to form a U-shaped closed frame mechanism.

[0027] In addition, reinforcing ribs 26 are arranged on each side panel 212 , two are arranged on the side panels 212 in the length direction and are located on both sides of the main beam 24 , and three are arranged on the side panels 212 in the width direction. The reinforcing ribs 26 extend along the height direction of the side panels 212 and are connected to the first flange connection frame 22 .

[0028] In addition, each of the side panels 212 is also provided with a plurality of mounting holes, which are used to connect the flameproof sleeve 27. There is no interference between the flameproof sleeve 27 and the reinforcing ribs 26. The number and position of the mounting holes and the flameproof sleeve 27 are set according to the number and specifications of the internal electrical components and cables. The flameproof sleeve 27 is provided with an internal thread for connecting the cable lead-in connector.

[0029] Furthermore, three first inner ribs 281 are arranged in parallel on the bottom plate 211, the first inner ribs 281 extend along the length direction of the bottom plate 211 and are staggered with the main beam 23, and the middle first inner rib 281 is located on the center line, the two first inner ribs 281 are symmetrically arranged about the center line, the second inner ribs 282 are arranged between the first inner ribs 281 on both sides and the adjacent side plates 212, the second inner ribs 282 are parallel to the width direction of the bottom plate 211, and a total of 8 second inner ribs 282 are arranged, which are symmetrically arranged about the main beam 3 25.

[0030] Furthermore, two mounting plates 29 are arranged below the main box body. The mounting plates 29 are parallel to the width direction of the bottom plate 211 and both ends extend to the outside of the bottom plate 211. A single mounting plate 29 is connected to a single reinforcing rib 26 at a corresponding position.

[0031] Furthermore, the first arc rib 201 is disposed between the first flange connection frame 22 and the side plate 212 .

[0032] Combination Figure 5 As shown, the upper cover body 10 includes a main cover plate 11 and a second flange connection frame 12 arranged around the end of the main cover plate 11, the second flange connection frame 12 is matched and connected to the first flange connection frame 22, and a second arc rib 101 is arranged between the main cover plate 11 and the second flange connection frame 12.

[0033] A plurality of reinforcing plates 111 are disposed inside the main cover plate 11 , and the reinforcing plates 111 extend along the width direction of the main cover plate 11 .

[0034] In addition, a plurality of connection holes 100 are provided on the first flange connection frame 22 and the second flange connection frame 12, and the spacing between the connection holes 100 close to the center line is smaller than the spacing between the connection holes 100 far from the center line. The center line is the center line of the first flange connection frame 22 or the second flange connection frame 12, and the connection holes 100 are used to set the screws 32. Therefore, the density of the screws 32 in the middle position is relatively large, and the density is smaller as it is closer to the two ends.

[0035] In this embodiment, a method for processing a frame-type high-strength flameproof enclosure is provided, comprising the following steps: First, the structure and size of the flameproof enclosure and the model and size of the cable are determined according to the electrical components installed inside. The position, size and number of the flameproof sleeve 27 are determined according to the model and size of the cable. Three-dimensional modeling is performed, and finite element analysis is performed on the model to determine the structural weak points and strengthen the structure, thereby adjusting the structure of the lower box body 20 and the upper cover body 10.

[0036] Secondly, according to the model that meets the requirements of finite element analysis, corresponding parts are manufactured and welded. The welding process includes:

[0037] Secondly, the first flange connection frame 22 is welded into shape, and the main beam three 25 is welded to the first flange connection frame 22 .

[0038] Next, the bottom plate 211 and the side plates 212 are welded to form a main box body.

[0039] Secondly, the first flange connection frame 22 is placed on the main box body, and the main beam 1 23 and the main beam 24 are welded, and the first flange connection frame 22 is welded and fixed to the main box body.

[0040] Next, the reinforcing rib 26, the first arc rib 201, the mounting plate 29, the first inner rib 281, the second inner rib 282 and the flameproof sleeve 27 are welded on the main box body to complete the welding.

[0041] Secondly, the welded flameproof enclosure is subjected to aging vibration treatment, and then the connection hole 100 is processed and formed on the first flange connection frame 22 .

[0042] Next, the main cover plate 11 and the second flange connection frame 12 are welded and formed, and the reinforcing plate 111 is welded, and the connection hole 100 is processed and formed on the second flange connection frame 12 .

[0043] Secondly, the explosion-proof surface of the first flange connection frame 22 and the second flange connection frame 12 is processed to form a certain gap and roughness, which can leak out the explosion pressure generated inside when an internal explosion occurs and extinguish the flame generated by the explosion and combustion.

[0044] Finally, the upper cover body 10 and the lower box body 20 are connected and fixed via the hinge 31 to form an explosion-proof housing structure.

[0045] Combination Figure 6-Figure 8 As shown, the explosion-proof enclosure in comparative example 1 lacks the main beam three compared with embodiment 1, and the explosion-proof enclosure in comparative example 2 only retains the basic structure of the main box body and the first flange connecting frame 22 compared with embodiment 1, and the overall thickness is increased by 10 mm. It can be seen that the explosion-proof enclosure in embodiment 1 is only deformed at the bottom position, the explosion-proof surface position is intact, and the explosion-proof function is good, while the explosion-proof enclosures in comparative examples 1 and 2 are deformed at the explosion-proof surface position, affecting the explosion-proof function.

[0046] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A frame-type high-strength flameproof enclosure, comprising an upper cover body and a lower box body that are rotatably connected, wherein the upper cover body is used to close the lower box body, and is characterized in that: The lower box comprises: A main box body, the main box body having a bottom plate and an outer frame arranged around the bottom plate, the outer frame comprising four side plates connected end to end, the top ends of the four side plates surrounding each other to form an open end; A first flange connection frame is arranged around the open end and is used to connect with the upper cover body; A main beam 1, arranged in the middle of the bottom plate and extending along the width direction of the bottom plate; The second main beam is arranged on the side plate in the length direction and extends along the height direction of the side plate; A main beam three, arranged in the first flange connection frame and extending along the width direction of the first flange connection frame; Among them, the positions of the main beam one, the main beam two and the main beam three correspond to each other and together form a closed frame structure.

2. The frame-type high-strength flameproof enclosure according to claim 1, characterized in that: Each of the side plates is also provided with a plurality of reinforcing ribs, which extend along the height direction of the side plates and are connected to the first flange connection frame.

3. The frame-type high-strength flameproof enclosure according to claim 2, characterized in that: Each of the side plates is also provided with a plurality of mounting holes, and the mounting holes are used to connect the flameproof sleeve, and there is no interference between the flameproof sleeve and the reinforcing ribs.

4. The frame-type high-strength flameproof enclosure according to claim 1, characterized in that: At least two first inner ribs are also arranged on the bottom plate, the first inner ribs extend along the length direction of the bottom plate and are staggered with the main beam, and second inner ribs are arranged between the first inner ribs and the adjacent side plates, the second inner ribs are parallel to the width direction of the bottom plate.

5. The frame-type high-strength flameproof enclosure according to claim 2, characterized in that: At least two mounting plates are arranged below the main box body. The mounting plates are parallel to the width direction of the bottom plate and both ends extend to the outside of the bottom plate. A single mounting plate is connected to a single reinforcing rib corresponding to the position.

6. The frame-type high-strength flameproof enclosure according to claim 1, characterized in that: A plurality of first arc-shaped ribs are arranged between the first flange connection frame and the side plate.

7. The frame-type high-strength flameproof enclosure according to claim 1, characterized in that: The upper cover body includes a main cover plate and a second flange connection frame arranged around the end of the main cover plate, the second flange connection frame is matched and connected to the first flange connection frame, and a second arc rib is arranged between the main cover plate and the second flange connection frame.

8. The frame-type high-strength flameproof enclosure according to claim 7, characterized in that: A plurality of reinforcing plates are arranged inside the main cover plate, and the reinforcing plates extend along the width direction of the main cover plate.

9. The frame-type high-strength flameproof enclosure according to claim 7, characterized in that: The first flange connection frame and the second flange connection frame are both provided with a plurality of connection holes, and the spacing between the connection holes close to the center line is smaller than the spacing between the connection holes far from the center line, and the center line is the center line of the first flange connection frame or the second flange connection frame.

10. A method for processing a frame-type high-strength flameproof enclosure, characterized in that: The flameproof enclosure according to any one of claims 1 to 9, wherein the processing method comprises the following steps: S10: Determine the structure and size of the flameproof enclosure and the type and size of the cable according to the electrical components installed inside, determine the position, size and quantity of the flameproof sleeve according to the type and size of the cable, perform three-dimensional modeling, perform finite element analysis on the model, and adjust the structure of the lower box body and the upper cover body accordingly; S20: According to the model that meets the requirements of finite element analysis, corresponding parts are manufactured and welded. The welding process includes: S21: The first flange connection frame is welded and formed, and the main beam 3 is welded to the first flange connection frame; S22: The bottom plate and the side plate are welded to form the main box body; S23: placing the first flange connection frame on the main box body, welding the first main beam and the second main beam, and welding and fixing the first flange connection frame to the main box body; S24: welding the reinforcing ribs, the first arc ribs, the mounting plate, the first inner ribs, the second inner ribs and the flameproof sleeve on the main box body to complete the welding; S25: Perform vibration aging treatment on the welded flameproof enclosure, and then process and form the connection holes on the first flange connection frame.

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