Impact-resistant explosion-proof fan

Abstract

The utility model belongs to the technical field of explosion-proof fans, and particularly relates to an impact-resistant explosion-proof fan. Aiming at the defect of lower structural strength of the existing explosion-proof fan, the utility model adopts the following technical scheme that the impact-resistant explosion-proof fan comprises a rectangular barrel, a first shield; a second shield; the motor blade assembly is fixed on the first shield; wherein two circumferential annular reinforcing ribs are fixedly connected to the inner side of the rectangular cylinder body, the first protective cover and the second protective cover are fixedly connected with the two annular reinforcing ribs respectively, and the first protective cover and the second protective cover are located on the axial outer sides of the two annular reinforcing ribs respectively. The impact-resistant explosion-proof fan has the advantages that the two circumferential annular reinforcing ribs are additionally arranged on the inner side of the rectangular barrel, the radial deformation resistance of the rectangular barrel is remarkably improved due to the arrangement of the annular reinforcing ribs, and displacement of the first protective cover and the second protective cover relative to the rectangular barrel after loosening is also limited.

Description

Impact-resistant explosion-proof fan Technical Field

[0001] This utility model belongs to the field of explosion-proof fan technology, specifically relating to an impact-resistant explosion-proof fan. Background Technology

[0002] Common explosion-proof fans are axial-flow cylindrical structures, with their protective covers typically welded together and secured to the cylinder with screws. Axial-flow cylindrical explosion-proof fans have the following drawbacks: 1. Low structural strength of the cylinder; 2. The protective cover is often made of welded steel wire, resulting in low structural strength; 3. Low strength at the joint between the protective cover and the cylinder. When an axial-flow cylindrical explosion-proof fan is subjected to external impact, the cylinder or protective cover is prone to deformation, affecting the normal operation of the fan. In particular, when the edge of the protective cover deforms inward, it may interfere with the rotating fan blades, generating electrical sparks (the outermost edge of the fan blades is the outermost part axially). Summary of the Invention

[0003] This invention addresses the shortcomings of existing explosion-proof fans in terms of low structural strength by providing an impact-resistant explosion-proof fan that improves structural strength and reduces or avoids the impact on normal operation of the fan caused by deformation of the protective cover or cylinder, especially preventing interference between the protective cover or cylinder and the fan blades.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: an impact-resistant explosion-proof fan, wherein the impact-resistant explosion-proof fan comprises:

[0005] Rectangular cylindrical body;

[0006] First protective shield;

[0007] Second protective shield;

[0008] The motor blade assembly is fixed to the first protective cover;

[0009] The rectangular cylinder has two circumferential annular reinforcing ribs fixed to its inner side. The first and second protective covers are fixed to the two annular reinforcing ribs respectively, and the first and second protective covers are located on the outer side of the two annular reinforcing ribs respectively.

[0010] This invention relates to an impact-resistant explosion-proof fan, which adds two circumferential annular reinforcing ribs to the inner side of a rectangular cylinder. The annular reinforcing ribs limit the displacement of the first and second protective covers relative to the rectangular cylinder after loosening, and also significantly improve the radial deformation resistance of the rectangular cylinder. The annular reinforcing ribs can be complete rings or incomplete rings (with gaps or breaks).

[0011] As an improvement, at least a portion of the cross-section of the annular stiffener is L-shaped.

[0012] As an improvement, the cross-section at the corner of the annular reinforcing rib is in the shape of a straight line.

[0013] As an improvement, the annular reinforcing rib includes two vertical L-shaped pieces and two horizontal notched pieces. The middle section of the notched piece is L-shaped, and the two end sections are straight.

[0014] As an improvement, the part where the annular reinforcing rib connects to the rectangular cylinder is located on the inner side of the axis.

[0015] As an improvement, both the annular reinforcing rib and the rectangular cylinder are metal parts and welded together.

[0016] As an improvement, both the first and second protective covers are fixed to the annular reinforcing ribs by multiple bolt and nut assemblies, with the nuts welded to the axial inner side of the annular reinforcing ribs.

[0017] As an improvement, the first shield includes a central radiating portion and an edge plate portion. The first shield also includes an annular portion extending axially from the radially outer end of the central radiating portion and a plurality of circumferentially distributed mounting plates extending radially from the annular portion. The mounting plates have openings, and the motor blade assembly is fixed to the mounting plates by bolt and nut assemblies.

[0018] The second shield consists of a central radiating section and edge plate sections.

[0019] As an improvement, the first protective cover has a first axial gap with the end face of the rectangular cylinder; the second protective cover has a second axial gap with the end face of the rectangular cylinder.

[0020] The second axial gap is longer than the first axial gap. A wire hole is opened on the second shield. Several winding components are arranged in a ring on the second shield. The winding components are located on the radial outer side of the airflow channel of the second shield.

[0021] As an improvement, the first shield is an air inlet shield, and the second shield is an air outlet shield; the motor axis of the motor blade assembly is closer to the second shield, and the blade axis of the motor blade assembly is closer to the first shield.

[0022] As an improvement, a handle is provided on the top of the rectangular cylinder, and the handle is fixed to the rectangular cylinder by a bolt and nut assembly;

[0023] The rectangular cylinder has multiple support feet at the bottom, which are fixed to the rectangular cylinder by bolt and nut assemblies.

[0024] The beneficial effects of this impact-resistant explosion-proof fan are as follows: Two circumferential annular reinforcing ribs are added to the inner side of the rectangular cylinder. The setting of the annular reinforcing ribs restricts the displacement of the first and second protective covers relative to the rectangular cylinder after they loosen, avoiding or reducing the interference between the first and second protective covers and the blades. The setting of the annular reinforcing ribs also significantly improves the radial deformation resistance of the rectangular cylinder, avoiding or reducing the interference between the first and second protective covers and the blades. Attached Figure Description

[0025] Figure 1 is a structural schematic diagram of the impact-resistant explosion-proof fan of Embodiment 1 of this utility model.

[0026] Figures 2 and 3 are exploded views of the impact-resistant explosion-proof fan of Embodiment 1 of this utility model from different angles.

[0027] Figure 4 is a cross-sectional view of the impact-resistant explosion-proof fan of Embodiment 1 of this utility model.

[0028] Figure 5 is a structural schematic diagram of the rectangular cylinder of the impact-resistant explosion-proof fan according to Embodiment 1 of this utility model.

[0029] Figure 6 is a structural schematic diagram of the first protective cover of the impact-resistant explosion-proof fan of Embodiment 1 of this utility model.

[0030] Figure 7 is a schematic diagram of the structure of the second protective cover of the impact-resistant explosion-proof fan of Embodiment 1 of this utility model.

[0031] Figure 8 is a schematic diagram of the annular reinforcing rib of the impact-resistant explosion-proof fan of Embodiment 1 of this utility model.

[0032] In the diagram, 1. Rectangular cylinder;

[0033] 2. First protective cover; 21. Central radiating section; 22. Edge plate section; 23. Annular section; 24. Mounting plate;

[0034] 3. Second protective cover; 31. Threading hole; 32. Winding component;

[0035] 4. Circular reinforcing rib; 41. L-shaped part; 42. Notched part;

[0036] 5. Handle;

[0037] 6. Support legs;

[0038] 7. Motor blade assembly. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be explained and described below. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0040] Referring to Figures 1 to 8, the impact-resistant explosion-proof fan of this utility model embodiment includes:

[0041] Rectangular cylindrical body;

[0042] First protective shield;

[0043] Second protective shield;

[0044] The motor blade assembly is fixed to the first protective cover;

[0045] The rectangular cylinder has two circumferential annular reinforcing ribs fixed to its inner side. At least part of the cross-section of the annular reinforcing ribs is L-shaped. The first protective cover and the second protective cover are fixed to the two annular reinforcing ribs respectively. The first protective cover and the second protective cover are located on the outer side of the two annular reinforcing ribs respectively.

[0046] The impact-resistant explosion-proof fan of this utility model has two circumferential annular reinforcing ribs added to the inner side of the rectangular cylinder. At least part of the cross section of the annular reinforcing ribs is L-shaped. The annular reinforcing ribs have good structural strength. The setting of the annular reinforcing ribs significantly improves the radial deformation resistance of the rectangular cylinder and also limits the displacement of the first and second protective covers relative to the rectangular cylinder after they loosen.

[0047] Example 1

[0048] Referring to Figures 1 to 8, the impact-resistant explosion-proof fan of Embodiment 1 of this utility model includes:

[0049] Rectangular cylinder 1;

[0050] First protective shield 2;

[0051] Second protective shield 3;

[0052] The motor blade assembly 7 is fixed to the first protective cover 2;

[0053] In this structure, two circumferential annular reinforcing ribs 4 are fixed to the inner side of the rectangular cylinder 1. At least part of the cross section of the annular reinforcing ribs 4 is L-shaped. The first protective cover 2 and the second protective cover 3 are fixed to the two annular reinforcing ribs 4 respectively. The first protective cover 2 and the second protective cover 3 are located on the outer side of the two annular reinforcing ribs 4 respectively.

[0054] In this embodiment, both the annular reinforcing rib 4 and the rectangular cylinder 1 are metal parts and welded together. The four corners of the rectangular cylinder 1 are rounded. Typically, both the annular reinforcing rib 4 and the rectangular cylinder 1 are made of stainless steel.

[0055] In this embodiment, both the first protective cover 2 and the second protective cover 3 are fixedly connected to the annular reinforcing rib 4 by multiple bolt and nut assemblies. The nuts are welded to the axial inner side of the annular reinforcing rib 4, thereby facilitating the assembly and disassembly of the first protective cover 2 and the second protective cover 3. The bolt and nut assemblies are axially arranged, and the bolt and nut assemblies do not bear the force along the radial direction of the bolt, making them less prone to loosening.

[0056] Referring to Figure 8, in this embodiment, the cross-section at the corner of the annular reinforcing rib 4 is in the shape of a straight line.

[0057] In this embodiment, the annular reinforcing rib 4 includes two vertical L-shaped members 41 and two horizontal notched members 42. The middle cross-section of the notched member 42 is L-shaped, and the cross-sections at both ends are straight. The cross-section of the 90° curved portion at both ends of the notched member 42 is straight. The two annular reinforcing ribs 4 are identical. The notched member 42 has notches at both ends, making it easy to process.

[0058] In this embodiment, the part of the annular reinforcing rib 4 that connects to the rectangular cylinder 1 is located on the inner side of the axis, and the outer side of the annular reinforcing rib 4 is a plane.

[0059] Referring to Figure 6, in this embodiment, the first protective cover 2 includes a central radiating portion 21 and an edge flat plate portion 22. The first protective cover 2 also includes an annular portion 23 extending axially from the radially outer end of the central radiating portion 21 and a plurality of circumferentially distributed mounting plates 24 extending radially from the annular portion 23. The mounting plates 24 have openings, and the motor blade assembly 7 is fixed to the mounting plates 24 by bolt and nut assemblies. The central radiating portion 21 includes a solid portion at the center and a radiating portion. The radiating portion of the central radiating portion 21 is used for airflow (air inlet and outlet).

[0060] Referring to Figure 7, in this embodiment, the second shield 3 includes a central radiating portion 21 and an edge plate portion 22, but lacks the annular portion 23 and mounting plate 24 for mounting the motor blade assembly 7. The central radiating portion 21 and the edge plate portion 22 are identical in both the first shield 2 and the second shield 3. Compared to the prior art where shields are welded from steel wire, the first shield 2 and the second shield 3 have a central radiating portion 21 and an edge plate portion 22. The central radiating portion 21 includes a solid portion at the center and a radiating portion, resulting in better structural strength. The first shield 2 also has an annular portion 23, and the structural strength of the first shield 2 is greater than that of the second shield 3.

[0061] In this embodiment, the first protective cover 2 and the end face of the rectangular cylinder 1 have a first axial gap; the second protective cover 3 and the end face of the rectangular cylinder 1 have a second axial gap. The first axial gap and the second axial gap are provided so that the first protective cover 2 and the second protective cover 3 are concealed within the rectangular cylinder 1. When subjected to external force impact in certain directions, the rectangular cylinder 1, rather than the protective cover, bears the impact, reducing the possibility of the first protective cover 2 and the second protective cover 3 bearing the impact and reducing the impact force on the first protective cover 2 and the second protective cover 3.

[0062] In this embodiment, the second axial gap is longer than the first axial gap. A wire-passing hole 31 is provided on the second shield 3, and several winding members 32 are arranged in a ring on the second shield 3. The winding members 32 are open (larger on the outside and smaller on the inside) U-shaped. There are four winding members. Referring to Figure 3, the winding members 32 are located on the radial outer side of the air outlet channel of the second shield 3, that is, the winding members are located on the edge plate portion (22) of the second shield 3, so as not to affect the airflow.

[0063] In this embodiment, the first shield 2 is an air inlet shield, and the second shield 3 is an air outlet shield. The motor axis of the motor blade assembly 7 is close to the second shield 3, and the blade axis of the motor blade assembly 7 is close to the first shield 2. Air is drawn in from the central radiating part 21 of the first shield 2 and then blown out from the central radiating part 21 of the second shield 3. The airflow generated by the motor blade assembly 7 dissipates heat from the motor. A wire hole 31 is provided on the second shield 3, and the second shield 3 is closer to the motor, resulting in a shorter lead wire.

[0064] In this embodiment, a handle 5 is provided on the top of the rectangular cylinder 1, and the handle 5 is fixedly connected to the rectangular cylinder 1 by a bolt and nut assembly.

[0065] In this embodiment, a plurality of support feet 6 are provided at the bottom of the rectangular cylinder 1, and the support feet 6 are fixed to the rectangular cylinder 1 by bolt and nut assembly.

[0066] In this embodiment, except for the nuts of the bolt and nut assembly connecting the motor blade assembly 7 which are not welded, the nuts in other bolt and nut assemblies are all welded, which facilitates disassembly and assembly.

[0067] In this embodiment, during assembly, the rectangular cylinder 1 and the two annular ribs are first welded together. Then, the first protective cover 2 and the motor blade assembly 7 are assembled together in advance. The first protective cover 2 is then installed on the annular ribs, the second protective cover 3 is installed on the annular ribs, and finally the handle 5 and the support foot 6 are installed.

[0068] Referring to Figure 4, in this embodiment, the most important thing to prevent in actual use is interference between the components and the fan blades. Adding the annular reinforcing rib 4 significantly improves the structural strength of the first shield 2 and the connection strength between the second shield 2 and the rectangular cylinder 1 (it also improves the structural strength of the second shield 3, but the second shield 3 is farther from the fan blades). Therefore, when the first shield is subjected to axial impact, the first shield 2 will not separate from the rectangular cylinder 1 (in the prior art, when the connection strength between the first shield 2 and the rectangular cylinder 1 is insufficient, the first shield 2 may partially or completely separate from the rectangular cylinder 1). Furthermore, even if the first shield 2 deforms, the most easily deformed area is the center, which is farther from the fan blades. The part of the first shield 2 closest to the fan blades is relatively less prone to deformation, thus ensuring that the first shield 2 can withstand greater axial impacts without interfering with the fan blades. The annular reinforcing rib 4 also significantly improves the structural strength of the rectangular cylinder 1, preventing deformation of the rectangular cylinder 1 and preventing interference between the rectangular cylinder 1 and the fan blades.

[0069] The beneficial effects of the impact-resistant explosion-proof fan of Embodiment 1 of this utility model are as follows: Two circumferential annular reinforcing ribs 4 are added to the inner side of the rectangular cylinder 1. At least part of the cross section of the annular reinforcing ribs 4 is L-shaped. The structural strength of the annular reinforcing ribs 4 is good. The setting of the annular reinforcing ribs 4 significantly improves the radial deformation resistance of the rectangular cylinder 1 and also limits the displacement of the first protective cover 2 and the second protective cover 3 relative to the rectangular cylinder 1 after loosening. The first protective cover 2 and the second protective cover 3 are hidden inside the rectangular cylinder 1, reducing the possibility of impact on the first protective cover 2 and the second protective cover 3 and reducing the impact force on the first protective cover 2 and the second protective cover 3. The bolt and nut assemblies connecting the first protective cover 2, the second protective cover 3 and the annular reinforcing ribs 4 are axially arranged. These bolt and nut assemblies only bear axial force and are not easy to loosen. The nuts connecting the first protective cover 2, the second protective cover 3 and the annular reinforcing ribs 4 are welded to the inner side of the annular reinforcing ribs 4, making it convenient to disassemble and assemble the first protective cover 2 and the second protective cover 3. The structural strength of the first protective cover 2 and the second protective cover 3 is good.

[0070] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the content described in the above specific embodiments. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. An impact-resistant explosion-proof fan, characterized in that: The impact-resistant explosion-proof fan includes: a rectangular cylinder (1); a first protective cover (2); a second protective cover (3); and a motor blade assembly (7) fixed on the first protective cover (2); wherein, two circumferential annular reinforcing ribs (4) are fixedly connected to the inner side of the rectangular cylinder (1), and the first protective cover (2) and the second protective cover (3) are respectively fixedly connected to the two annular reinforcing ribs (4), and the first protective cover (2) and the second protective cover (3) are respectively located on the axial outer side of the two annular reinforcing ribs (4).

2. The impact-resistant explosion-proof fan according to claim 1, characterized in that: At least part of the cross section of the annular reinforcing rib (4) is L-shaped.

3. The impact-resistant explosion-proof fan according to claim 2, characterized in that: The cross section at the corner of the annular reinforcing rib (4) is in the shape of a straight line.

4. The impact-resistant explosion-proof fan according to claim 3, characterized in that: The annular reinforcing rib (4) includes two vertical L-shaped pieces (41) and two horizontal notched pieces (42). The middle section of the notched piece (42) is L-shaped, and the two end sections are straight.

5. The impact-resistant explosion-proof fan according to claim 2, characterized in that: Both the annular reinforcing rib (4) and the rectangular cylinder (1) are metal parts and are welded together. The part where the annular reinforcing rib (4) is connected to the rectangular cylinder (1) is located on the inner side of the axis.

6. The impact-resistant explosion-proof fan according to any one of claims 1 to 5, characterized in that: The first shield (2) includes a central radiating portion (21) and an edge plate portion (22). The first shield (2) also includes an annular portion (23) extending axially from the radial outer end of the central radiating portion (21) and a plurality of circumferentially distributed mounting plates (24) extending radially from the annular portion (23). The mounting plates (24) have openings, and the motor blade assembly (7) is fixed to the mounting plates (24) by bolt and nut assembly. The second shield (3) includes a central radiating portion (21) and an edge plate portion (22).

7. The impact-resistant explosion-proof fan according to any one of claims 1 to 5, characterized in that: The first protective cover (2) and the end face of the rectangular cylinder (1) have a first axial gap; the second protective cover (3) and the end face of the rectangular cylinder (1) have a second axial gap.

8. The impact-resistant explosion-proof fan according to claim 7, characterized in that: The second axial gap is longer than the first axial gap. A wire hole (31) is opened on the second shield (3). Several winding parts (32) are arranged in a ring on the second shield (3). The winding parts (32) are located on the radial outer side of the airflow channel of the second shield (3).

9. The impact-resistant explosion-proof fan according to claim 8, characterized in that: The first shield (2) is an air inlet shield, and the second shield (3) is an air outlet shield; the motor axis of the motor blade assembly (7) is close to the second shield (3), and the blade axis of the motor blade assembly (7) is close to the first shield (2); and / or, the winding member (32) is U-shaped with a larger outer diameter and a smaller inner diameter.

10. The impact-resistant explosion-proof fan according to any one of claims 1 to 5, characterized in that: A handle (5) is provided on the top of the rectangular cylinder (1), and the handle (5) is fixed to the rectangular cylinder (1) by a bolt and nut assembly; and / or, a plurality of support feet (6) are provided on the bottom of the rectangular cylinder (1), and the support feet (6) are fixed to the rectangular cylinder (1) by a bolt and nut assembly; and / or, the first protective cover (2) and the second protective cover (3) are both fixed to the annular reinforcing rib (4) by a plurality of bolt and nut assemblies, and the nuts are welded to the axial inner side of the annular reinforcing rib (4).

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