High-efficiency low-noise air conditioner outdoor unit axial flow fan

Abstract

The utility model relates to the technical field of fan mesh enclosures, in particular to a high-efficiency low-noise air conditioner outdoor unit axial flow fan which comprises a mesh enclosure and an impeller, the mesh enclosure is sequentially provided with a shaft ring, an inverted-cone-shaped mesh enclosure part, a plane mesh enclosure part and an outer side face mesh enclosure part from inside to outside, and the impeller is provided with a blade radial point P; the blade radial point P is arranged in the blade height area ranging from 0.4 M to 0.55 M, the inner ring of the plane mesh enclosure part is located over the blade radial point P, the outer ring of the plane mesh enclosure part is located over the outer diameter of the impeller, and the distance between the blade radial point P and the plane mesh enclosure part is larger than or equal to 120 mm. The distance between every two adjacent annular wefts located in the area of the plane mesh enclosure part (1b) is L01, the distance between every two adjacent annular wefts located in the area of the inverted-cone-shaped mesh enclosure part (1a) is L02, L01 is larger than L02, the mesh enclosure is small in resistance, small in air outlet flow loss and low in noise, and the efficiency of a fan system is improved.

Description

Technical Field

[0001] This utility model relates to the field of fan guard technology, specifically a high-efficiency, low-noise axial flow fan for outdoor units of air conditioners. Background Technology

[0002] An axial flow fan in an outdoor unit of an air conditioner is driven by a motor to rotate an impeller. Gas flows axially into the blade channel, and the gas is propelled by the impeller through the interaction between the blades and the gas. It is then discharged axially through the air guide ring, thus forming a fan system consisting of a motor, bracket, air guide ring, impeller, and screen.

[0003] like Figure 1 As shown, the existing axial flow fan screens generally use flat screens. Due to safety requirements, the distance between the impeller and the screen outlet must be ≤120mm, and the spacing between the two rings of wire in the screen must be ≤12.7mm. The working characteristics of axial flow fans are: the air velocity in the 50%M to 100%M blade height section is high, accounting for the majority of the impeller's work, while the air velocity in the 0%M to 50%M blade height section is low, and the work done is less.

[0004] Because existing axial flow fans use flat screens, the flow area and resistance characteristics of the screen are the same in areas with high airflow velocity and areas with low airflow velocity. Therefore, there are problems such as large airflow loss, high fan noise, and low fan system efficiency in the 50% to 100% blade height area. Utility Model Content

[0005] The purpose of this invention is to provide a high-efficiency, low-noise axial flow fan for an outdoor unit of an air conditioner, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A high-efficiency, low-noise axial flow fan for an outdoor unit of an air conditioner includes a motor, a bracket, an impeller, a guide ring, and a screen. The screen, from the inside out, comprises a shaft collar, an inverted conical screen portion, a flat screen portion, and an outer side screen portion. The small-diameter end of the inverted conical screen portion is connected to the outer ring of the shaft collar, and the large-diameter end of the inverted conical screen portion is connected to the inner ring of the flat screen portion. The flat screen portion and the outer side screen portion are perpendicular to each other, and the outer ring of the flat screen portion is connected to the top of the outer side screen portion. The bottom end of the outer side screen portion is connected to one end of the guide ring. The impeller has a radial point P on its blades, which is the point on the impeller blades that is closest to the screen in the radial direction. The radial point P is located on the impeller blades. In the middle, the inner ring of the planar mesh cover is located directly above the radial point P of the blade, and the outer ring of the planar mesh cover is located directly above the outer diameter of the impeller. The inverted conical mesh cover, the planar mesh cover, and the outer side mesh cover are all composed of multiple rings of weft and warp. The multiple rings of weft are arranged in a ring on the outside of the shaft collar at intervals. The weft is fitted with warp, which extends along the radial direction of the shaft collar. One end of the warp is connected to the shaft collar. The distance between the radial point P of the blade and the planar mesh cover is ≥120mm. The distance between two adjacent rings of weft in the planar mesh cover area is L01, and the distance between two adjacent rings of weft in the inverted conical mesh cover is L02. L01 > L02.

[0008] As a further technical solution, the length of the impeller blade in the transverse direction is the blade height M, that is, the distance between the tip of the impeller blade and the outer edge, and the radial point P of the blade is set in the blade height range of 0.4M-0.55M.

[0009] As a further technical solution, the distance L01 between two adjacent annular weft lines in the planar mesh cover region is 20mm, and the distance L02 between two adjacent annular weft lines in the inverted conical mesh cover region is 12mm.

[0010] As a further technical solution, one end of the warp thread is integrally formed with a U-shaped ring, and the mesh cover is connected to the air guide ring through the U-shaped ring.

[0011] As a further technical solution, the mesh cover is provided with a plurality of auxiliary reinforcing ribs, which are disposed between two adjacent warp threads. The starting point of the auxiliary reinforcing rib is located in the inner circle of the planar mesh cover, and the ending point of the auxiliary reinforcing rib is flush with the bottom end of the annular weft thread.

[0012] As a further technical solution, the motor is fixedly connected to the bracket and to the bottom of the impeller, the air guide ring is disposed in the circumference of the impeller and fixedly connected to the bracket, and the mesh cover covers and is fixed on the air guide ring.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] The fan system's mesh cover has low resistance, minimal airflow loss, and low noise, improving the efficiency of the fan system. It is suitable for use in rotating machinery, especially in outdoor fan systems of heat pumps or air conditioners that contain air heat exchange devices. The distance between the mesh cover and the impeller, as well as the gap between the annular weft threads, are designed according to the impeller's outlet air velocity. The mesh cover gap is larger where the outlet air velocity is high and smaller where the outlet air velocity is low, reducing airflow loss and fan system noise. Auxiliary reinforcing ribs and warp threads are installed on the mesh cover to ensure its structural strength. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the prior art structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the isometric structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 4 This is a top view of the structure of this utility model;

[0019] Figure 5 This is a utility model Figure 4 A schematic diagram of the AA-plane cross-sectional structure in the middle;

[0020] Figure 6 This is a schematic diagram of the mesh cover structure of this utility model.

[0021] In the diagram: 1. Mesh cover; 2. Air guide ring; 3. Impeller; 4. Motor; 5. Support frame; 6. Annular weft thread; 7. Auxiliary reinforcing rib; 8. Warp thread; 9. Shaft collar; 10. U-shaped ring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 2-6In this embodiment of the utility model, a high-efficiency, low-noise axial flow fan for an outdoor unit of an air conditioner includes a motor 4, a bracket 5, an impeller 3, an air guide ring 2, and a mesh cover 1. The motor 4 is fixedly connected to the bracket 5 and to the bottom of the impeller 3. The air guide ring 2 is arranged around the impeller 3 and is fixedly connected to the bracket 5. The mesh cover 1 covers and is fixed on the air guide ring 2. Air passes from below the motor 4, through the motor 4 and the bracket 5, into the air guide ring 2, and is driven by the rotation of the impeller 3 to do work. It is then discharged into the atmosphere through the mesh cover 1.

[0024] The mesh cover 1, from the inside out, consists of a collar 9, an inverted conical mesh cover part 1a, a flat mesh cover part 1b, and an outer side mesh cover part 1c. The small diameter end of the inverted conical mesh cover part 1a is connected to the outer ring of the collar 9, and the large diameter end of the inverted conical mesh cover part 1a is connected to the inner ring of the flat mesh cover part 1b. The flat mesh cover part 1b and the outer side mesh cover part 1c are arranged perpendicularly to each other, and the outer ring of the flat mesh cover part 1b is connected to the top of the outer side mesh cover part 1c. The bottom end of the outer side mesh cover part 1c is connected to one end of the air guide ring 2. The inverted conical mesh cover part 1a, the flat mesh cover part 1b, and the outer side mesh cover part 1c are all composed of multiple loops of weft threads 6 and warp threads 8. The multiple loops of weft threads 6 are arranged in a series of intervals on the outside of the collar 9. The 6 is equipped with warp threads 8, which extend radially along the collar 9. One end of the warp thread 8 is connected to the collar 9, and the other end of the warp thread 8 is integrally formed with a U-shaped ring 11. A bolt structure is installed inside the U-shaped ring 11 to securely connect the mesh cover 1 and the air guide ring 2. Furthermore, in order to ensure the stability of the mesh cover 1, multiple auxiliary reinforcing ribs 7 are provided on the mesh cover 1. The auxiliary reinforcing ribs 7 are located between two adjacent warp threads 8. The starting point of the auxiliary reinforcing ribs 7 is located in the inner circle of the planar mesh cover part 1b, and the ending point of the auxiliary reinforcing ribs 7 is flush with the bottom end of the annular weft thread 6. In order to reduce the airflow loss at the outlet of the mesh cover 1, the distance between the mesh cover 1 and the impeller 3 and the gap between the multiple annular weft threads 6 are related to the airflow velocity at the outlet of the impeller 3.

[0025] like Figure 5 As shown, the impeller 3 is provided with a blade radial point P, which is the point on the impeller 3 that is closest to the screen 1 in the radial direction of the blade. The blade radial point P is located in the middle of the blade of the impeller 3. Specifically, the blade radial point P is set in the blade height area of ​​0.4M-0.55M. The inner ring of the planar screen part 1b is located directly above the blade radial point P, and the outer ring of the planar screen part 1b is located directly above the outer diameter of the impeller 3.

[0026] It should be noted here that the length of the three blades of the impeller in the transverse direction is the blade height M, which is the distance between the tip of the impeller blade and the outer edge.

[0027] Furthermore, the distance between the radial point P of the blade and the planar mesh portion 1b is ≥120mm, the distance between two adjacent annular weft lines 6 in the area of ​​the planar mesh portion 1b is L01, the distance between two adjacent annular weft lines 6 in the inverted conical mesh portion 1a is L02, and L01>L02.

[0028] In existing axial flow fan systems, for safety reasons, the distance between the impeller and the screen outlet is no more than 120mm, and the gap between the multiple rings of weft threads of the screen is no more than 12.7mm. The distance between the impeller and the screen outlet is the distance between the highest point of the impeller and the highest point of the screen.

[0029] In this invention, the distance between the radial point P of the blade and the planar mesh cover 1b is ≥120mm; the distance L01 between two adjacent annular weft lines 6 located in the area of ​​the planar mesh cover 1b is 20mm; and the distance L02 between two adjacent annular weft lines 6 located in the inverted conical mesh cover 1a is 12mm. This can be obtained from experiments.

[0030]

[0031] Conclusion: The fan system of this application effectively improves the aerodynamic efficiency of the fan system by 2.5% and reduces the noise of the fan system by 1.5 dB(A).

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-efficiency, low-noise axial flow fan for an outdoor unit of an air conditioner, comprising a motor (4), a bracket (5), an impeller (3), a guide ring (2), and a mesh cover (1), characterized in that, The screen (1) is provided with a collar (9), an inverted conical screen part (1a), a flat screen part (1b), and an outer side screen part (1c) in sequence from the inside out. The small diameter end of the inverted conical screen part (1a) is connected to the outer ring of the collar (9), and the large diameter end of the inverted conical screen part (1a) is connected to the inner ring of the flat screen part (1b). The flat screen part (1b) and the outer side screen part (1c) are arranged perpendicular to each other, and the outer ring of the flat screen part (1b) is connected to the top of the outer side screen part (1c). The bottom end of the outer side screen part (1c) is connected to one end of the guide ring (2). The impeller (3) is provided with a blade radial point P. The blade radial point P is the point on the impeller (3) that is closest to the screen (1) in the radial direction of the blade. The blade radial point P is located in the middle of the blade of the impeller (3). The inner ring of the flat screen part (1b) is located in the middle of the blade of the impeller (3). Directly above the radial point P of the blade, the outer ring of the planar mesh cover (1b) is located directly above the outer diameter of the impeller (3); the inverted conical mesh cover (1a), the planar mesh cover (1b), and the outer side mesh cover (1c) are all composed of multiple loops of weft (6) and warp (8). The multiple loops of weft (6) are arranged in a ring on the outside of the shaft ring (9) at intervals. The warp (8) is installed on the loops of weft (6). The warp (8) extends along the radial direction of the shaft ring (9). One end of the warp (8) is connected to the shaft ring (9). The distance between the radial point P of the blade and the planar mesh cover (1b) is ≥120mm. The distance between two adjacent loops of weft (6) in the area of ​​the planar mesh cover (1b) is L01, and the distance between two adjacent loops of weft (6) in the inverted conical mesh cover (1a) is L02. L01>L02.

2. The high-efficiency, low-noise axial flow fan for the outdoor unit of an air conditioner according to claim 1, characterized in that, The length of the blade in the transverse direction of the impeller (3) is the blade height M, which is the distance between the end of the impeller blade and the outer edge. The radial point P of the blade is set in the blade height range of 0.4M-0.55M.

3. The high-efficiency, low-noise axial flow fan for the outdoor unit of an air conditioner according to claim 2, characterized in that, The distance L01 between two adjacent annular weft lines (6) in the planar mesh cover section (1b) is 20 mm, and the distance L02 between two adjacent annular weft lines (6) in the inverted conical mesh cover section (1a) is 12 mm.

4. The high-efficiency, low-noise axial flow fan for the outdoor unit of an air conditioner according to claim 3, characterized in that, One end of the warp (8) is integrally formed with a U-shaped ring (10), and the mesh cover (1) is connected to the air guide ring (2) through the U-shaped ring (10).

5. The high-efficiency, low-noise axial flow fan for the outdoor unit of an air conditioner according to claim 3, characterized in that, The mesh cover (1) is provided with a plurality of auxiliary reinforcing ribs (7). The auxiliary reinforcing ribs (7) are located between two adjacent warp lines (8). The starting point of the auxiliary reinforcing ribs (7) is located in the inner circle of the planar mesh cover part (1b), and the ending point of the auxiliary reinforcing ribs (7) is flush with the bottom end of the annular weft line (6).

6. The high-efficiency, low-noise axial flow fan for the outdoor unit of an air conditioner according to any one of claims 1 to 5, characterized in that, The motor (4) is fixedly connected to the bracket (5) and connected to the bottom of the impeller (3). The air guide ring (2) is set in the circumference of the impeller (3) and fixedly connected to the bracket (5). The mesh cover (1) covers and is fixed on the air guide ring (2).

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