A circulating fan with inter-stage backflow stabilizing flow structure and a method of use

Abstract

The application relates to the technical field of circulating fans, in particular to a circulating fan with a stage backflow flow stabilizing structure and a use method, which comprises a supporting base, a circulating fan rack is fixedly installed at the top of the supporting base, a first fan impeller and a second fan impeller are sequentially arranged in the circulating fan rack along an axial direction, the first fan impeller and the second fan impeller are connected through a rotating shaft, a stage backflow flow stabilizing mechanism is arranged between the first fan impeller and the second fan impeller, the stage backflow flow stabilizing mechanism comprises a fixing frame arranged on the circulating fan rack, and a backflow cavity is arranged in the fixing frame. Through the arrangement of the stage backflow flow stabilizing mechanism, the air flow can be combed multiple times, the air flow is guided through a plurality of arc-shaped guide vanes to change from radial flow to axial flow, direct impact of the air flow on the second fan impeller is avoided, the air flow distribution uniformity is improved, the operation efficiency is improved, and the energy consumption is reduced.

Description

Technical Field

[0001] This invention relates to a circulating fan with an interstage reflux stabilization structure, and more particularly to a circulating fan with an interstage reflux stabilization structure and its usage method, belonging to the field of circulating fan technology. Background Technology

[0002] A circulating fan is a device that uses mechanical energy to drive the continuous circulation of gas in a closed or semi-closed system. It relies on an electric motor to drive the impeller to rotate at high speed, using centrifugal force or axial thrust to draw in air and accelerate its discharge, forming a continuous airflow. In a closed system, the gas is repeatedly pushed and drawn in, forming a closed-loop circulation path. It is widely used in industries, construction, and home appliances. Its core functions are to promote airflow, achieve uniform heat / gas distribution, and improve system efficiency.

[0003] The interstage recirculation channels of existing multi-stage circulating fans are mostly simple straight or curved pipe structures, which have the following technical defects: When the airflow flows out of the outlet of the front impeller, it has a high flow velocity and radial flow component. When it directly enters the rear impeller, it is easy to impact the blades of the rear impeller, generating a large number of eddies and airflow pulsations, which leads to reduced fan efficiency and increased energy consumption. At the same time, during the interstage flow, backflow and flow deviation are prone to occur, resulting in uneven airflow distribution, affecting the aerodynamic performance of the rear impeller, and exacerbating fan vibration and noise.

[0004] Therefore, there is an urgent need to improve the circulating fan with an interstage recirculation and flow stabilization structure and its usage method to solve the above-mentioned problems. Summary of the Invention

[0005] The purpose of this invention is to provide a circulating fan with an interstage reflux stabilization structure and its usage method. By setting the interstage reflux stabilization mechanism, the airflow can be combed multiple times and guided by several arc-shaped guide vanes to change the airflow from radial flow to axial flow, avoiding direct impact between the airflow and the impeller of the second fan, improving the uniformity of airflow distribution, improving operating efficiency and reducing energy consumption.

[0006] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0007] A circulating fan with an interstage reflux stabilization structure includes a support base, on the top of which a circulating fan frame is fixedly mounted. A first fan impeller and a second fan impeller are sequentially arranged axially inside the circulating fan frame. The first and second fan impellers are connected by a shaft. An interstage reflux stabilization mechanism is provided between the first and second fan impellers. The interstage reflux stabilization mechanism includes a fixed frame mounted on the circulating fan frame. A reflux cavity is provided inside the fixed frame. Several arc-shaped guide vanes are fixedly mounted on the inner wall of the fixed frame inside the reflux cavity. Two flow equalization grids are symmetrically arranged on the fixed frame.

[0008] Preferably, the two flow equalization grids include several flow equalization plates, and the flow equalization plates and several arc-shaped guide vanes are fixedly connected to the fixing frame by welding. Several ventilation holes are evenly opened on the flow equalization plates, and a groove is opened on one side of the flow equalization plates.

[0009] Preferably, a sound-absorbing layer is fixedly installed on the inner wall of the fixing frame. The sound-absorbing layer is a porous ceramic material or a sound-absorbing cotton layer, used to reduce the noise generated by airflow.

[0010] Preferably, the fixing frame includes a first support frame and a second support frame arranged symmetrically. Two first flanges are fixedly installed on the surface of the circulating fan frame. Second flanges are fixedly installed on the surfaces of both the first support frame and the second support frame. Adjacent first flanges and second flanges are fastened together by a number of fastening bolts and fastening nuts.

[0011] Preferably, a plurality of positioning frames are fixedly installed on the first flange, and a plurality of positioning rods are fixedly installed on the second flange.

[0012] Preferably, the positioning rod is cylindrical in shape, and the external dimensions of the positioning rod are adapted to the internal dimensions of the positioning frame.

[0013] Preferably, rubber rings are fixedly installed on both sides of the first support frame and the second support frame, and two sealing grooves are opened on the inner side of the circulating fan frame.

[0014] Preferably, a plurality of legs are fixedly installed at the bottom of the support base, and rubber pads are fixedly installed at the bottom of the legs.

[0015] Preferably, the interstage reflux stabilization mechanism is made entirely of wear-resistant and high-temperature-resistant alloy, and its surface is coated with an anti-corrosion coating.

[0016] Preferably, a method of using a circulating fan with an interstage recirculation and flow stabilization structure is characterized by comprising the following steps:

[0017] S1. After connecting the rotating shaft inside the circulating fan frame to the external drive motor, start the motor to drive the first fan impeller and the second fan impeller to rotate inside the circulating fan frame.

[0018] S2. The airflow passes through the air inlet of the circulating fan frame and the first fan impeller. The airflow is then introduced into the fixed frame by the first fan impeller. The airflow first passes through the flow equalization plate at the front end for the first flow equalization and sorting, reducing airflow pulsation. Then, after the airflow enters the return cavity, it is guided by several arc-shaped guide vanes, which change the airflow from radial flow to axial flow. At the same time, the flow cross-sectional area of ​​the guide channel formed by the combination of several arc-shaped guide vanes gradually increases, realizing the diffusion and deceleration of the airflow, reducing the airflow velocity and pulsation amplitude.

[0019] S3. The decelerated airflow undergoes a second flow equalization process through the flow equalization plate at the rear end of the fixed frame, further homogenizing the airflow so that it can be smoothly transported through the second fan impeller.

[0020] This invention has at least the following beneficial effects:

[0021] 1. With the interstage reflux stabilization mechanism, when the airflow is introduced into the fixed frame by the first fan impeller, the flow equalization plate at the front end of the fixed frame can perform initial sorting of the airflow. After sorting, the airflow enters the reflux chamber in the fixed frame and is guided by several arc-shaped guide vanes to change the airflow from radial flow to axial flow. At the same time, the airflow is diffused and decelerated, and then undergoes secondary sorting by the flow equalization plate at the rear end of the fixed frame. This avoids direct impact between the airflow and the second fan impeller, improves the uniformity of airflow distribution, improves operating efficiency, and reduces energy consumption.

[0022] 2. The sound-absorbing layer is fixed to the inner wall of the mounting frame with a high-temperature resistant adhesive. When using porous ceramic materials, its continuous porous structure is used to absorb high-frequency noise from the airflow. When using sound-absorbing cotton layers, the damping characteristics of polyester fiber sound-absorbing cotton are used to absorb mid-to-low-frequency noise. The thickness of the sound-absorbing layer is uniformly set to 5-10mm to balance sound absorption effect and airflow space. The mounting frame is a split structure with the first support frame and the second support frame symmetrically spliced. The first support frame and the second support frame are locked with several fastening bolts and nuts to achieve a rigid connection with the circulating fan frame, which is convenient for installation and disassembly and facilitates maintenance of the internal parts of the mounting frame.

[0023] 3. The positioning frame 18 and the positioning rod 19 can position the first support frame 601 and the second support frame 602 during installation. When installing the first support frame 601 and the second support frame 602, the first support frame 601 and the second support frame 602 are inserted laterally onto the circulating fan frame 2, so that the positioning rod 19 is inserted into the positioning frame 18. After the positioning frame 18 and the positioning rod 19 are connected, the first support frame 601 and the second support frame 602 are supported and positioned, improving the portability of installation. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0025] Figure 1 This is a schematic diagram of the overall structure of a circulating fan with an interstage recirculation and flow stabilization structure and its usage method according to the present invention.

[0026] Figure 2 This is a schematic diagram showing the separation of the fan frame and the fixed frame structure of a circulating fan with an interstage reflux stabilization structure and its usage method according to the present invention.

[0027] Figure 3 This is a schematic diagram of the internal structure of the mounting frame of a circulating fan with an interstage reflux stabilization structure and its usage method according to the present invention.

[0028] Figure 4 This is a schematic diagram of the fixed frame and flow equalization grid structure of a circulating fan with an interstage backflow stabilization structure and its usage method according to the present invention.

[0029] Figure 5 This is a schematic diagram of the sealing groove structure of a circulating fan with an interstage reflux stabilization structure and its usage method according to the present invention;

[0030] Figure 6 This invention relates to a circulating fan with an interstage recirculation and flow stabilization structure and its usage method. Figure 1 Enlarged view of point A in the middle.

[0031] In the diagram, 1. Support base; 2. Circulating fan frame; 3. First fan impeller; 4. Second fan impeller; 5. Interstage reflux stabilizing mechanism; 6. Fixing frame; 7. Reflux chamber; 8. Arc-shaped guide vane; 9. Flow equalization grid; 10. Flow equalization plate; 11. Ventilation hole; 12. Groove; 13. Sound absorption layer; 601. First support frame; 602. Second support frame; 14. First flange; 15. Second flange; 16. Fastening bolt; 17. Fastening nut; 18. Positioning frame; 19. Positioning rod; 20. Rubber ring; 21. Sealing groove; 22. Support leg; 23. Rubber pad. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] like Figures 1-6 As shown in the figure, this embodiment provides a circulating fan with an interstage recirculation and flow stabilization structure and an embodiment of its usage method.

[0034] A circulating fan with an interstage reflux stabilization structure includes a support base 1, a circulating fan frame 2 fixedly mounted on the top of the support base 1, a first fan impeller 3 and a second fan impeller 4 arranged sequentially along the axial direction inside the circulating fan frame 2, the first fan impeller 3 and the second fan impeller 4 connected by a rotating shaft, an interstage reflux stabilization mechanism 5 provided between the first fan impeller 3 and the second fan impeller 4, the interstage reflux stabilization mechanism 5 including a fixed frame 6 set on the circulating fan frame 2, a reflux cavity 7 provided inside the fixed frame 6, a plurality of arc-shaped guide vanes 8 fixedly mounted on the inner wall of the fixed frame 6 inside the reflux cavity 7, and two flow equalization grids 9 symmetrically arranged on the fixed frame 6.

[0035] With the interstage reflux stabilization mechanism 5, when the airflow is introduced into the fixed frame 6 by the first fan impeller 3, the flow equalization plate 10 at the front end of the fixed frame 6 has several flow equalization plates 10 that can perform initial airflow equalization. After equalization, the airflow enters the reflux chamber 7 in the fixed frame 6 and is guided by several arc-shaped guide vanes 8 to change the airflow from radial flow to axial flow. The flow cross-sectional area of ​​the guide channel formed by the combination of several arc-shaped guide vanes 8 gradually increases, which diffuses and decelerates the airflow. After passing through the flow equalization plate 10 at the rear end of the fixed frame 6, the airflow is further equalized, avoiding direct impact between the airflow and the second fan impeller 4, reducing the airflow velocity and pulsation amplitude, improving the aerodynamic performance and operating efficiency of the subsequent impeller and reducing energy consumption.

[0036] In this embodiment, as Figures 1-6 As shown, the two flow equalization grids 9 include several flow equalization plates 10. The flow equalization plates 10 and several arc-shaped guide vanes 8 are all fixedly connected to the fixed frame 6 by welding. Several ventilation holes 11 are evenly opened on the flow equalization plates 10. A groove 12 is opened on one side of the flow equalization plates 10. A sound-absorbing layer 13 is fixedly installed on the inner wall of the fixed frame 6. The sound-absorbing layer 13 is a porous ceramic material or a sound-absorbing cotton layer, which is used to reduce the noise generated by the airflow. The fixed frame 6 includes a first support frame 601 and a second support frame 602 arranged symmetrically. Two first flanges 14 are fixedly installed on the surface of the circulating fan frame 2. Second flanges 15 are fixedly installed on the surfaces of the first support frame 601 and the second support frame 602. Adjacent first flanges 14 and second flanges 15 are fastened together by several fastening bolts 16 and fastening nuts 17.

[0037] Several flow equalization plates 10 and several arc-shaped guide vanes 8 are welded into the fixing frame 6 to ensure installation stability and prevent shaking. Meanwhile, several ventilation holes 11 are evenly distributed on the flow equalization plates 10, with a diameter of 5mm to 20mm, effectively homogenizing airflow and reducing airflow pulsation. A sound-absorbing layer 13 is installed, fixed to the inner wall of the fixing frame 6 with a high-temperature resistant adhesive. When using porous ceramic materials, its continuous porous structure absorbs high-frequency noise from the airflow. A sound-absorbing cotton layer is also selected. At the same time, the damping characteristics of polyester fiber sound-absorbing cotton are used to absorb mid-to-low frequency noise. The thickness of the sound-absorbing layer 13 is uniformly set to 5-10mm, taking into account both sound absorption effect and airflow space. The fixing frame 6 is set as a split structure with the first support frame 601 and the second support frame 602 symmetrically spliced. The first support frame 601 and the second support frame 602 are locked with several fastening bolts 16 and fastening nuts 17 to achieve a rigid connection with the circulating fan frame 2, which facilitates installation and disassembly and makes it easy to maintain the inside of the fixing frame 6.

[0038] In this embodiment, as Figures 1-6 As shown, several positioning frames 18 are fixedly installed on the first flange 14, and several positioning rods 19 are fixedly installed on the second flange 15. The positioning rods 19 are cylindrical in shape, and the external dimensions of the positioning rods 19 are adapted to the internal dimensions of the positioning frames 18. Rubber rings 20 are fixedly installed on both sides of the first support frame 601 and the second support frame 602. Two sealing grooves 21 are opened on the inner side of the circulating fan frame 2.

[0039] The positioning frame 18 and positioning rod 19 provide positioning for the installation of the first support frame 601 and the second support frame 602. During installation, the first and second support frames 601 and 602 are inserted laterally into the circulating fan frame 2, allowing the positioning rod 19 to engage with the positioning frame 18. After the positioning frame 18 and positioning rod 19 are connected, the first and second support frames 601 and 602 are supported and positioned, facilitating the assembly of the fastening bolts 16 onto the first flange 14 and the second flange 15. To improve ease of installation, the cylindrical positioning rod 19 is easier to insert into the positioning frame 18. At the same time, the external dimensions of the positioning rod 19 are adapted to the internal dimensions of the positioning frame 18, so that the positioning frame 18 and the positioning rod 19 form an interference fit, which not only ensures positioning accuracy but also facilitates smooth insertion and removal during assembly. This further prevents misalignment of the flange. With the setting of rubber ring 20 and sealing groove 21, after the first support frame 601 and the second support frame 602 are installed and fixed, the rubber ring 20 and the sealing groove 21 adopt an interference fit to achieve a full circumferential seal between the fixed frame and the circulating fan frame, completely preventing interstage airflow leakage.

[0040] In this embodiment, as Figures 1-6 As shown, several support legs 22 are fixedly installed at the bottom of the support base 1, and rubber pads 23 are fixedly installed at the bottom of the support legs 22. The interstage reflux stabilizing mechanism 5 is made of wear-resistant and high-temperature resistant alloy and is coated with an anti-corrosion coating.

[0041] With the support legs 22 and rubber pads 23, the support legs 22 are evenly welded to the bottom of the support base 1, and the rubber pads 23 are fixed to the bottom of the support legs 22 by a pressing process. The rubber pads 23 are made of wear-resistant and non-slip rubber material, which plays a role in shock absorption, noise reduction and anti-slip, reducing the transmission of vibration of the circulating fan to the ground. The circulating fan frame 2 is made of chromium-nickel-molybdenum wear-resistant and high-temperature resistant alloy casting. The surface is coated with an epoxy zinc-rich anti-corrosion coating by electrostatic spraying process. The coating thickness is controlled at 0.2-0.5mm, which greatly improves the wear resistance and corrosion resistance of the mechanism, avoids corrosion caused by long-term airflow scouring, and extends the service life.

[0042] In this embodiment, as Figures 1-6 As shown in the figure, the working process of a circulating fan with an interstage recirculation and flow stabilization structure and its usage method provided in this embodiment is as follows:

[0043] Step 1: After connecting the rotating shaft inside the circulating fan frame 2 to the external drive motor, start the motor to drive the first fan impeller 3 and the second fan impeller 4 to rotate inside the circulating fan frame 2.

[0044] Step 2: The airflow passes through the air inlet of the circulating fan frame 2 and the first fan impeller 3. Then, the airflow is introduced into the fixed frame 6 through the first fan impeller 3. The airflow first passes through the front flow equalization plate 10 for the first flow equalization and sorting to reduce airflow pulsation. Then, the airflow enters the return cavity 7 and is guided by several arc-shaped guide vanes 8 to change the airflow from radial flow to axial flow. At the same time, the flow cross-sectional area of ​​the guide channel formed by the combination of several arc-shaped guide vanes 8 gradually increases, realizing the diffusion and deceleration of the airflow and reducing the airflow velocity and pulsation amplitude.

[0045] Step 3: The decelerated airflow undergoes a second flow equalization process through the flow equalization plate 10 at the rear end of the fixed frame 6, further equalizing the airflow so that it can be smoothly transported through the second fan impeller 4.

[0046] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A circulating fan with an interstage reflux stabilization structure, comprising a support base (1), wherein a circulating fan frame (2) is fixedly mounted on the top of the support base (1), and a first fan impeller (3) and a second fan impeller (4) are sequentially arranged axially inside the circulating fan frame (2), wherein the first fan impeller (3) and the second fan impeller (4) are connected by a rotating shaft, characterized in that: An interstage reflux stabilizing mechanism (5) is provided between the first fan impeller (3) and the second fan impeller (4). The interstage reflux stabilizing mechanism (5) includes a fixed frame (6) set on the circulating fan frame (2). The fixed frame (6) has a reflux cavity (7) inside. The reflux cavity (7) has a plurality of arc-shaped guide vanes (8) fixedly installed on the inner wall of the fixed frame (6). Two flow equalization grids (9) are symmetrically arranged on the fixed frame (6).

2. A circulating fan with an interstage recirculation and flow stabilization structure according to claim 1, characterized in that: The two flow equalization grids (9) include several flow equalization plates (10), and the several flow equalization plates (10) and several arc-shaped guide vanes (8) are fixedly connected to the fixed frame (6) by welding. Several ventilation holes (11) are evenly opened on the flow equalization plate (10), and a groove (12) is opened on one side of the flow equalization plate (10).

3. A circulating fan with an interstage recirculation and flow stabilization structure according to claim 1, characterized in that: A sound-absorbing layer (13) is fixedly installed on the inner wall of the fixed frame (6). The sound-absorbing layer (13) is a porous ceramic material or a sound-absorbing cotton layer, which is used to reduce the noise generated by airflow.

4. A circulating fan with an interstage recirculation and flow stabilization structure according to claim 1, characterized in that: The fixed frame (6) includes a first support frame (601) and a second support frame (602) arranged symmetrically. Two first flanges (14) are fixedly installed on the surface of the circulating fan frame (2). Second flanges (15) are fixedly installed on the surfaces of the first support frame (601) and the second support frame (602). The adjacent first flanges (14) and second flanges (15) are fastened together by a number of fastening bolts (16) and fastening nuts (17).

5. A circulating fan with an interstage recirculation and flow stabilization structure according to claim 4, characterized in that: Several positioning frames (18) are fixedly installed on the first flange (14), and several positioning rods (19) are fixedly installed on the second flange (15).

6. A circulating fan with an interstage recirculation and flow stabilization structure according to claim 5, characterized in that: The positioning rod (19) is cylindrical in shape, and the external dimensions of the positioning rod (19) are adapted to the internal dimensions of the positioning frame (18).

7. A circulating fan with an interstage recirculation and flow stabilization structure according to claim 6, characterized in that: Rubber rings (20) are fixedly installed on both sides of the first support frame (601) and the second support frame (602), and two sealing grooves (21) are opened on the inner side of the circulating fan frame (2).

8. A circulating fan with an interstage recirculation and flow stabilization structure according to claim 1, characterized in that: The bottom of the support base (1) is fixedly equipped with several legs (22), and the bottom of the legs (22) is fixedly equipped with rubber pads (23).

9. A circulating fan with an interstage recirculation and flow stabilization structure according to claim 1, characterized in that: The interstage reflux stabilization mechanism (5) is made of wear-resistant and high-temperature resistant alloy and has an anti-corrosion coating on its surface.

10. The method of using a circulating fan with an interstage recirculation and flow stabilization structure according to claim 1, characterized in that, Includes the following steps: S1. After connecting the rotating shaft inside the circulating fan frame (2) to the external drive motor, start the motor to drive the first fan impeller (3) and the second fan impeller (4) to rotate inside the circulating fan frame (2); S2. The airflow passes through the air inlet of the circulating fan frame (2) and then through the first fan impeller (3). The airflow is then introduced into the fixed frame (6) through the first fan impeller (3). The airflow first passes through the flow equalization plate (10) at the front end for the first flow equalization and sorting, reducing the airflow pulsation. Then the airflow enters the return cavity (7) and is guided by several arc-shaped guide vanes (8), changing the airflow from radial flow to axial flow. At the same time, the flow cross-sectional area of ​​the guide channel formed by the combination of several arc-shaped guide vanes (8) gradually increases, realizing the diffusion and deceleration of the airflow, reducing the airflow velocity and pulsation amplitude. S3. After deceleration, the airflow passes through the flow equalization plate (10) at the rear end of the fixed frame (6) for a second flow equalization process, further equalizing the airflow so that the airflow passes smoothly through the second fan impeller (4) for transport.

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