Fan air inlet integrated structure

Abstract

The utility model relates to a fan air inlet integration structure relates to the technical field of fluid machinery, it includes first flange, a plurality of reinforcing rib, second flange, first cone and arc cylinder, the inner ring of first flange the big diameter end fixed connection of first cone, the one end of first flange is away from first cone and is fixed with fan casing, the one end of first cone is away from first flange and is fixed with arc cylinder, the inner end of reinforcing rib is respectively fixed with first flange and first cone, the outer end of reinforcing rib is fixed with second flange. The utility model can improve the stability of fan air inlet ventilation.

Description

Technical Field

[0001] This utility model relates to the technical field of fluid machinery, and in particular to an integrated structure for a fan inlet. Background Technology

[0002] High-pressure fans are key equipment that provide high-pressure, high-volume airflow to systems, and are widely used in high-pressure scenarios such as industrial exhaust, pneumatic material conveying, boiler combustion, and tunnel ventilation. In these applications, the aerodynamic efficiency, operational stability, and structural reliability of the fans are of paramount importance.

[0003] Currently, the mainstream high-pressure ventilators on the market typically employ a split-type design for their air inlets. For example... Figure 1 As shown, this traditional structure mainly consists of two parts: a separate air inlet duct and a fan casing. The air inlet duct is usually a separate horn-shaped or tapered component, and its outlet end is connected to the inlet end of the fan casing via a flange. Sometimes, a transition section is added between the two to ensure a smooth connection.

[0004] For example, Chinese utility model patent with publication number CN205908522U and publication date of July 18, 2016, proposes a fan inlet anti-vortex device and a fan, including: an air inlet duct, a vertical baffle and a horizontal baffle, which are fixed to the side wall of the fan casing by welding to form a closed annular area.

[0005] Regarding the aforementioned technologies, since the air inlet duct and the fan casing are independent components, if a transition section is added at their connection, protruding structures such as flange mating surfaces and bolts will inevitably exist. When high-speed airflow passes through this area, it will create abrupt changes in the flow cross-section and flow boundary, which can easily lead to airflow separation and strong turbulence. Utility Model Content

[0006] To improve the stability of ventilation at the fan inlet, this utility model provides an integrated structure for the fan inlet.

[0007] This utility model provides an integrated structure for a fan inlet, employing the following technical solution: An integrated structure for a fan inlet includes a first flange, multiple reinforcing ribs, a second flange, a first cone, and an arc-shaped cylinder. The inner ring of the first flange is fixedly connected to the large-diameter end of the first cone. The end of the first flange away from the first cone is fixed to the fan housing. The end of the first cone away from the first flange is fixedly connected to the arc-shaped cylinder. The inner ends of the reinforcing ribs are fixedly connected to the first flange and the first cone, respectively. The outer ends of the reinforcing ribs are fixedly connected to the second flange.

[0008] Preferably, a second cone is fixedly installed on the outer ring of the first cone, the large-diameter end of the second cone is fixedly connected to the second flange, and the second cone is fixedly connected to the reinforcing rib.

[0009] Preferably, a cylinder is fixedly sleeved on the outer end of the reinforcing rib, and one end of the cylinder is fixedly connected to the second flange.

[0010] Preferably, the reinforcing rib is arc-shaped at the end near the first flange.

[0011] Preferably, a first stiffening plate is fixedly installed between the first flange and the first cone, and a second stiffening plate is fixedly installed between the first cone and the second cone.

[0012] Preferably, a third stiffening plate is fixedly installed between the second cone and the second flange.

[0013] Preferably, the wall thickness of both the first cone and the arc-shaped cylinder is less than the wall thickness of the second cone.

[0014] Preferably, a sealing ring is fixedly installed at one end of the first flange.

[0015] In summary, this utility model has at least one of the following beneficial technical effects: 1. By directly and integrally molding and fixing key airflow channel components such as the first cone and arc-shaped cylinder with the first flange and connecting them to the fan casing, a continuous and smooth integrated air intake channel is formed. This eliminates the protrusions and gaps caused by flange connection surfaces and bolts in traditional split structures, reduces airflow separation, turbulence, and pressure loss, thereby improving the overall aerodynamic efficiency and output pressure of the fan.

[0016] 2. Multiple reinforcing ribs tightly connect the first flange, which bears the main load, to the external second flange, forming a robust spatial support frame. This improves the rigidity and strength of the entire air inlet structure, effectively resisting vibration and deformation during fan operation and ensuring long-term operational stability and reliability.

[0017] 3. The second cone and the first cone form a double-layered conical shell structure, which, together with the reinforcing ribs, forms a skeletal support structure. This further enhances the structure's resistance to deformation, especially radial deformation, making it more suitable for extreme working conditions with ultra-high negative or positive pressure, and ensuring higher safety.

[0018] 4. The first conical cylinder and the arc-shaped cylinder are connected in sequence to form a continuous, smooth, tapering flow channel. This achieves smooth guidance and acceleration of airflow from the inlet to the impeller inlet, effectively avoiding airflow separation and vortices caused by flange connections and abrupt changes in cross-section in traditional split structures. It reduces turbulence losses and inlet resistance, thereby improving the aerodynamic efficiency and pressure rise capacity of the fan, and reducing operating noise.

[0019] 5. The independent air inlet duct and transition connection section in the traditional structure have been eliminated. This shortens the axial length of the air inlet, making the structure more compact and saving installation space. Furthermore, during on-site installation, only the first flange needs to be aligned with the fan casing, eliminating the need for multiple flange alignment and tightening procedures. This not only simplifies installation and reduces labor intensity but also avoids installation risks and leakage hazards caused by misalignment of flange bolt holes. Attached Figure Description

[0020] Figure 1 This is a cross-sectional schematic diagram of the overall structure of an embodiment of this utility model; Figure 2 yes Figure 1 A schematic diagram of the upper middle section; Figure 3 yes Figure 2 A magnified view of part A in the middle; Figure 4 yes Figure 2 A magnified view of part B in the middle section; Figure 5 yes Figure 2 A magnified view of part C in the diagram.

[0021] Explanation of reference numerals in the attached drawings: 1. First flange; 2. Reinforcing rib; 3. Second flange; 4. First cone; 5. Arc-shaped cylinder; 6. Second cone; 7. Cylinder; 8. First stiffening plate; 9. Second stiffening plate; 10. Third stiffening plate; 11. Sealing ring. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1 To be continued Figure 5 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0023] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0024] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0027] This utility model discloses an integrated structure for a fan inlet. (Refer to...) Figures 1 to 5 A fan inlet integrated structure mainly includes a first flange 1, multiple reinforcing ribs 2, a second flange 3, a first cone 4, and an arc-shaped cylinder 5. The large-diameter end of the inner ring of the first cone 4 of the first flange 1 is fixedly connected by welding or integral die casting. The end of the first flange 1 away from the first cone 4 is fixed to the fan housing by bolts. The end of the first cone 4 away from the first flange 1 is fixedly connected to the arc-shaped cylinder 5 by welding or integral die casting. The inner ends of the reinforcing ribs 2 are fixedly connected to the first flange 1 and the first cone 4 by welding. Multiple reinforcing ribs 2 are evenly distributed along the circumference of the first cone 4. The outer ends of the reinforcing ribs 2 are fixedly connected to the second flange 3 by welding.

[0028] Airflow is drawn in from the end of the arc-shaped cylinder 5 and enters the fan through the first conical cylinder 4. By directly and integrally molding and fixing key airflow channel components such as the first conical cylinder 4 and the arc-shaped cylinder 5 with the first flange 1 and connecting them to the fan casing, a continuous and smooth integrated air intake channel is formed. This eliminates the protrusions and gaps caused by flange connection surfaces and bolts in traditional split structures, reducing airflow separation, turbulence, and pressure loss, thereby improving the overall aerodynamic efficiency and output pressure of the fan. Multiple reinforcing ribs 2 tightly connect the first flange 1, which bears the main load, to the external second flange 3, forming a robust spatial support frame. This improves the rigidity and strength of the entire air intake structure, effectively resisting vibration and deformation during fan operation and ensuring long-term operational stability and reliability.

[0029] The entire air inlet is connected to the fan casing as an integrated module. During on-site installation, only the first flange 1 needs to be connected to the interface, eliminating the need for multiple layers and flanges to fix the structure, reducing pressure loss, and eliminating the complicated steps of centering and tightening multiple bolts in the traditional structure. This greatly simplifies the installation process, reduces the risk of installation errors, and also facilitates subsequent disassembly and maintenance.

[0030] Reference Figures 1 to 4 In some embodiments, a second cone 6 is fixedly installed on the outer ring of the first cone 4. The large-diameter end of the second cone 6 is fixedly connected to the second flange 3, and the second cone 6 is fixedly connected to the reinforcing rib 2. The second cone 6 and the first cone 4 form a double-layer conical shell structure, which, together with the reinforcing rib 2, forms a skeleton support structure. This further enhances the structure's resistance to deformation, especially its resistance to radial deformation, making it more suitable for extreme working conditions with ultra-high negative or positive pressure, and providing higher safety.

[0031] Reference Figure 5 In some embodiments, a cylinder 7 is fixedly sleeved on the outer end of the reinforcing rib 2, and one end of the cylinder 7 is fixedly connected to the second flange 3. The cylinder 7, as a continuous annular connector, integrates the outer ends of all the reinforcing ribs 2 into one, making the stress distribution from the second flange 3 to each reinforcing rib 2 more uniform and avoiding stress concentration; it enhances the torsional rigidity and integrity of the entire structural frame, and makes the operation more stable.

[0032] Reference Figure 2 In some embodiments, the reinforcing rib 2 is arc-shaped at the end near the first flange 1. This reduces stress concentration while providing more installation space for the first flange 1, facilitating its fixation.

[0033] Reference Figure 3In some embodiments, a first stiffening plate 8 is fixedly installed between the first flange 1 and the first cone 4, and a second stiffening plate 9 is fixedly installed between the first cone 4 and the second cone 6. The first stiffening plate 8 strengthens the connection point between the first flange 1 and the first cone 4; the second stiffening plate 9 strengthens the connection between the first cone 4 and the second cone 6. This effectively prevents fatigue cracks from forming at these critical welded or connected parts due to long-term alternating stress, thus extending the service life.

[0034] Reference Figure 2 In some embodiments, a third stiffening plate 10 is fixedly installed between the second cone 6 and the second flange 3. The third stiffening plate 10 is used to strengthen the connection root between the second cone 6 and the second flange 3, which can disperse the stress at this point, prevent cracking or plastic deformation at the connection, and ensure the durability of the main support structure.

[0035] Reference Figure 2 In some embodiments, the wall thickness of the first cone 4 and the arc-shaped cylinder 5 is smaller than the wall thickness of the second cone 6. As the main flow guiding components, the first cone 4 and the arc-shaped cylinder 5 can reduce the overall weight and save material costs by thinning their wall thickness while ensuring sufficient rigidity.

[0036] Reference Figure 3 In some embodiments, a sealing ring 11 is fixedly installed at one end of the first flange 1. The sealing ring 11 improves the sealing performance at the connection between the air inlet module and the fan housing. This solves the leakage problem that may exist in traditional flange connections. For negative pressure suction systems, it can prevent the intake of external air and ensure system performance; for positive pressure systems, it can prevent gas leakage and improve operational safety and environmental protection. At the same time, it simplifies installation and reduces the stringent requirements for the machining precision of the flange contact surface.

[0037] The implementation principle of the integrated structure for a fan inlet in this embodiment of the utility model is as follows: By integrally molding or welding the first cone 4, arc-shaped cylinder 5, and first flange 1, a continuous, smooth, tapering flow channel is formed. This eliminates the protrusions and gaps caused by flange connections in traditional split structures, allowing the airflow to smoothly transition and efficiently accelerate to the impeller inlet. This significantly reduces turbulence losses, inlet resistance, and operating noise, thereby improving the aerodynamic efficiency and output pressure of the fan. Structurally, multiple reinforcing ribs 2 and the second cone 6 construct a double-layer conical shell support frame connecting the first flange 1 and the second flange 3, enhancing the overall structural rigidity, strength, and resistance to deformation.

[0038] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. An integrated structure for a fan inlet, characterized in that: The device includes a first flange (1), multiple reinforcing ribs (2), a second flange (3), a first cone (4), and an arc-shaped cylinder (5). The inner ring of the first flange (1) is fixedly connected to the large-diameter end of the first cone (4). The end of the first flange (1) away from the first cone (4) is fixed to the fan housing. The end of the first cone (4) away from the first flange (1) is fixedly connected to the arc-shaped cylinder (5). The inner end of the reinforcing rib (2) is fixedly connected to the first flange (1) and the first cone (4) respectively. The outer end of the reinforcing rib (2) is fixedly connected to the second flange (3).

2. The integrated structure for the fan inlet according to claim 1, characterized in that: The outer ring of the first cone (4) is fixedly installed with a second cone (6), the large diameter end of the second cone (6) is fixedly connected to the second flange (3), and the second cone (6) is fixedly connected to the reinforcing rib (2).

3. The integrated structure for the fan inlet according to claim 2, characterized in that: The outer end of the reinforcing rib (2) is fixedly fitted with a cylinder (7), and one end of the cylinder (7) is fixedly connected to the second flange (3).

4. The integrated structure for the fan inlet according to claim 1, characterized in that: The reinforcing rib (2) is arranged in an arc shape at one end near the first flange (1).

5. The integrated structure for the fan inlet according to claim 2, characterized in that: A first stiffener plate (8) is fixedly installed between the first flange (1) and the first cone (4), and a second stiffener plate (9) is fixedly installed between the first cone (4) and the second cone (6).

6. The integrated structure for the fan inlet according to claim 2, characterized in that: A third stiffener (10) is fixedly installed between the second cone (6) and the second flange (3).

7. The integrated structure for the fan inlet according to claim 1, characterized in that: The wall thickness of the first cone (4) and the arc-shaped cylinder (5) is smaller than that of the second cone (6).

8. The integrated structure for the fan inlet according to any one of claims 1-7, characterized in that: A sealing ring (11) is fixedly installed at one end of the first flange (1).

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