Air duct system and design method of air duct shell of air duct system

Abstract

The invention discloses an air duct system and a design method of an air duct shell thereof. The air duct system comprises the air duct shell, a wind wheel and a motor. One end of the air duct shell is an air inlet end face, the other end of the air duct shell is an air outlet end face, and the air inlet end face and the air outlet end face are connected through a side slope to form an air duct cavity; the sectional area of the air inlet end face is smaller than that of the air outlet end face, so that the air duct shell is of a big-end-up structure. The design method comprises the following steps: 1) calculating the diameter of a basic circle of the air duct shell; 2) calculating the diameter of the air inlet end face of the air duct shell; 3) calculating the diameter of the air outlet end face of the air duct shell; and 4) adjusting the height of the air duct shell. The air duct shell with the large upper portion and the small lower portion is designed, on the premise that the same wind wheel is used, the designed air duct system is larger in air outlet area, air outlet is more uniform, the air speed is stable, the stability and reliability of the air duct system are improved, compared with a volute-shaped air duct, the structural design with the large upper portion and the small lower portion is simpler, and the air duct system is more convenient to use. And the manufacturing and processing costs are lower.

Description

Technical Field

[0001] The invention belongs to the technical field of air ducts, and in particular relates to a design method of an air duct system and an air duct shell thereof. Background Art

[0002] The design and shape of the air duct, as a component used to guide and transport airflow in the ventilation system, has a crucial impact on the efficiency and performance of the system. Currently on the market, cylindrical and volute shapes are the two most common air duct shapes, each with unique characteristics and applicable scenarios. However, both cylindrical and volute ducts have some potential for improvement. For example, cylindrical ducts may face the problem of uneven airflow distribution, while volute ducts may increase the difficulty of manufacturing and installation due to their complex shape. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned technical problems existing in the prior art, and to provide a design method for an air duct system and an air duct casing thereof, which has a reasonable design and strong practicality. The air duct casing is designed to be larger at the top and smaller at the bottom, so that, under the premise of using the same wind wheel, the air duct system designed in the present application has a larger air outlet area, more uniform air outlet, and stable wind speed, thereby improving the stability and reliability of the air duct system. Moreover, compared with the volute-shaped air duct, this upper-large-lower-small structural design is also simpler, and the manufacturing and processing costs are lower.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A duct system comprises a duct housing, a wind wheel and a motor, wherein the motor and the wind wheel are arranged in the duct housing; one end of the duct housing is an air inlet end face, and the other end of the duct housing is an air outlet end face, the air inlet end face and the air outlet end face are connected by a side inclined surface to form an air duct cavity; an air inlet port is arranged on the air inlet end face, and an air outlet port is arranged on the air outlet end face; the cross-sectional area of ​​the air inlet end face is smaller than the cross-sectional area of ​​the air outlet end face, so that the duct housing presents a structure with a larger upper part and a smaller lower part.

[0006] Furthermore, the air inlet end face and the air outlet end face are both circular, making the air duct shell a truncated cone structure. The design is ingenious and reasonable. The air inlet and outlet end faces are designed to be circular, so that the airflow is more evenly distributed in the air duct cavity, reducing wind resistance. The truncated cone-shaped air duct shell can guide the airflow to flow more smoothly in the air duct cavity and reduce energy consumption.

[0007] Furthermore, an air guide ring is provided at the air inlet port, and the air guide ring is protruding toward the direction of the air duct cavity. The air guide ring can guide the airflow to smoothly enter the air duct cavity from the air inlet port, reduce the turbulence and turbulence of the airflow at the air inlet port, improve the stability and efficiency of the airflow, and also contribute to the uniform distribution of the airflow in the air duct cavity. The air guide ring is made of metal material to ensure structural strength and improve the overall structural firmness and stability at the air inlet end face.

[0008] Furthermore, the inner wall of the air guide ring is flush with the side wall of the air inlet port. The design is ingenious and the flush design can reduce resistance, is more conducive to the smooth transition of gas entering the air duct cavity, and helps to maintain the stability and continuity of the airflow.

[0009] Furthermore, the air guide ring is arranged to protrude toward the direction of the wind duct cavity, one end of the air guide ring is fixed to the air inlet end face, and the other end of the air guide ring extends to the air inlet of the wind wheel. The structural design is ingenious and reasonable, which can more effectively guide the airflow into the wind duct cavity, so that the airflow forms a stable airflow field in front of the wind wheel air inlet, reduces the turbulence and eddy current of the airflow at the wind wheel air inlet, and improves the wind wheel air inlet efficiency and performance.

[0010] The design method of the air duct housing based on the above-mentioned air duct system includes the following steps:

[0011] 1) Design the duct housing based on the backward-inclined wind wheel. The diameter of the backward-inclined wind wheel is a, and the height is b. The range of a is between 200mm and 280mm. First calculate the basic circle diameter R1 of the duct housing. The correction coefficient α1 is 0.787878. The basic circle diameter R1 of the duct housing is a / α1;

[0012] 2) Calculate the diameter R2 of the air inlet end face of the air duct housing. The correction coefficient α2 is 0.7878. If the wind wheel diameter a is between 200 mm and 280 mm, 200 mm is used as the base number. The diameter R2 of the air inlet end face of the air duct housing is the base number 200 / α2.

[0013] 3) Calculate the outlet diameter R3 of the air duct housing. The correction coefficient α3 is 0.2121, R3 = R1 + (R1 × α3);

[0014] 4) The height of the air duct housing is adjusted accordingly according to the thickness of the motor, and ensure that the distance d between the bottom surface of the wind wheel and the air inlet end surface of the air duct housing is between 9mm and 10mm.

[0015] The present invention has the following beneficial effects due to the adoption of the above technical solution:

[0016] The present invention is reasonable in design and highly practical. The design of the air duct housing is large at the top and small at the bottom, so that under the premise of using the same wind wheel, the air duct system designed by the present application has a larger air outlet area, more uniform air outlet, and stable wind speed, thereby improving the stability and reliability of the air duct system. Moreover, compared with the volute-shaped air duct, this large-at-top-and-small-at-bottom structural design is also simpler, and the manufacturing and processing costs are lower. Driven by the kinetic energy of the motor, the wind wheel rotates at a high speed, generating a negative pressure layer at the air inlet port, causing the airflow to enter the air duct cavity. Under the centrifugal action of the wind wheel, the airflow is thrown to the periphery of the wind wheel and flows along the air duct cavity to the air outlet port.

[0017] The present invention reasonably designs the sizes of the air inlet end face and the air outlet end face of the air duct housing so that the entire air duct housing has a truncated cone structure that is larger at the top and smaller at the bottom. The product has a larger air outlet area, more uniform air outlet, and more stable wind speed. The distance range between the bottom surface of the wind wheel and the air inlet end face is reasonably adjusted according to the actual size of the motor, which helps to reduce airflow turbulence and noise, improve the stability of the operation of the entire air duct system, and enhance the overall performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings:

[0019] Figure 1 It is a structural schematic diagram of an air duct system of the present invention;

[0020] Figure 2 It is a schematic diagram of the internal cross-sectional structure of the present invention;

[0021] Figure 3 for Figure 1 Schematic diagram of the top structure;

[0022] Figure 4 It is a schematic diagram of air inlet and air outlet in the present invention;

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 6 for Figure 5 Schematic diagram of the structure from another perspective.

[0025] In the figure, 1-air duct housing; 2-wind wheel; 3-motor; 4-air inlet end face; 5-air outlet end face; 6-side inclined surface; 7-air inlet port; 8-air outlet port; 9-air guide ring; 10-air duct cavity. DETAILED DESCRIPTION

[0026] like Figures 1 to 6As shown, an air duct system of the present invention comprises an air duct housing 1, a wind wheel 2 and a motor 3, wherein the motor 3 and the wind wheel 2 are arranged in the air duct housing 1; one end of the air duct housing 1 is an air inlet end face 4, and the other end of the air duct housing 1 is an air outlet end face 5, the air inlet end face 4 and the air outlet end face 5 are connected by a side inclined surface 6 to form an air duct cavity 10; an air inlet port 7 is arranged on the air inlet end face 4, and an air outlet port 8 is arranged on the air outlet end face 5; the air inlet port 7 and the air outlet port 8 are both connected and communicated with the air duct cavity 10, and the cross-sectional area of ​​the air inlet end face 4 is smaller than the cross-sectional area of ​​the air outlet end face 5, so that the air duct housing 1 has a structure of being larger at the top and smaller at the bottom.

[0027] The air inlet end face 4 and the air outlet end face 5 are both circular, so that the air duct housing 1 has a truncated cone structure, and the air inlet port 7 and the air outlet port 8 are also circular. The air inlet end face 4 is provided with an air inlet port 7, and the aperture of the air outlet port 8 matches the diameter of the air outlet end face 5, so that the air outlet end face 5 is the air outlet port 8. The design is ingenious and reasonable. The air inlet and outlet end faces 5 and the air inlet and outlet ports 8 are both designed to be circular, so that the airflow is more evenly distributed in the air duct cavity 10, reducing local resistance and uneven wind speed problems, and the circular design can ensure the structural stability of the air duct housing 1. The truncated cone-shaped air duct housing 1 can guide the airflow to flow more smoothly in the air duct cavity 10, reducing energy consumption, so that the air duct cavity 10 is also truncated cone-shaped. The smooth inner wall of the truncated cone also helps to reduce noise, improve the stability and comfort of the system, and the manufacturing process of the circular design is relatively simple, which helps to reduce manufacturing costs and facilitates the installation and maintenance of the air duct system.

[0028] An air guide ring 9 is provided at the air inlet port 7, which can guide the airflow to smoothly enter the air duct cavity 10 from the air inlet port 7, reduce the disorder and turbulence of the airflow at the air inlet port 7, improve the stability and efficiency of the airflow, and also help the uniform distribution of the airflow in the air duct cavity 10. The air guide ring 9 is made of metal material to ensure the structural strength and improve the overall structural firmness and stability of the air inlet end face 4. The inner side wall of the air guide ring 9 is flush with the side wall of the air inlet port 7, and the design is ingenious. The flush design can reduce resistance, is more conducive to the smooth transition of the gas entering the air duct cavity 10, reduces energy consumption, and helps to maintain the stability and continuity of the airflow. The air guide ring 9 is arranged to protrude toward the air duct cavity 10, one end of the air guide ring 9 is fixed to the air inlet end face 4, and the other end of the air guide ring 9 extends to the air inlet of the wind wheel 2. The structural design is ingenious and reasonable, which can more effectively guide the airflow into the air duct cavity 10, so that the airflow forms a stable airflow field in front of the air inlet of the wind wheel 2, reduces the turbulence and eddy current of the airflow at the air inlet of the wind wheel 2, and improves the air intake efficiency and performance of the wind wheel 2.

[0029] The present invention is reasonable in design and highly practical. The design of the air duct housing 1 with a larger upper part and a smaller lower part makes it possible to use the same wind wheel 2, and the air outlet area of ​​the air duct system designed by the present application is larger, the air outlet is more uniform, the wind speed is stable, and the stability and reliability of the air duct system are improved. Moreover, compared with the volute-shaped air duct, this larger upper part and smaller lower structure design is also simpler, and the manufacturing and processing costs are lower. Driven by the kinetic energy of the motor 3, the wind wheel 2 rotates at a high speed, and a negative pressure layer is generated at the air inlet port 7, so that the airflow enters the air duct cavity 10. Under the centrifugal action of the wind wheel 2, the airflow is thrown to the periphery of the wind wheel 2, and flows along the air duct cavity 10 to the air outlet port 8.

[0030] The design method of the air duct housing 1 based on the above-mentioned air duct system comprises the following steps:

[0031] 1) The air duct housing 1 is designed based on the backward-inclined wind wheel 2. The diameter of the backward-inclined wind wheel 2 is a, and the height is b. The range of a is between 200 mm and 280 mm. First, the basic circle diameter R1 of the air duct housing 1 is calculated. The correction coefficient α1 is 0.787878. The basic circle diameter R1 of the air duct housing 1 is a / α1;

[0032] 2) Calculate the diameter R2 of the air inlet end face 4 of the air duct housing 1. The correction coefficient α2 is 0.7878. The diameter a of the wind wheel 2 is between 200 mm and 280 mm. 200 mm is used as the base number. The diameter R2 of the air inlet end face 4 of the air duct housing 1 is the base number 200 / α2.

[0033] 3) Calculate the diameter R3 of the outlet end face 5 of the air duct housing 1. The correction coefficient α3 is 0.2121, R3 = R1 + (R1 × α3);

[0034] 4) The height of the air duct housing is adjusted accordingly according to the thickness of the motor 3, and it is ensured that the distance d between the bottom surface of the wind wheel 2 and the air inlet end surface 4 of the air duct housing 1 is between 9 mm and 10 mm.

[0035] Embodiments of the present invention:

[0036] 1) Design the air duct housing 1 based on the backward-inclined wind wheel 2, the diameter of the backward-inclined wind wheel 2 is a=260mm, and the height is b=145mm. First calculate the basic circle diameter R1 of the air duct housing 1, the correction coefficient α1 is 0.787878, and the basic circle diameter R1 of the air duct housing 1 is 260mm / 0.787878≈330mm;

[0037] 2) Calculate the diameter R2 of the air inlet end face 4 of the air duct housing 1. The correction coefficient α2 is 0.7878. The diameter a of the wind wheel 2 is 260 mm. 260 mm is between 200 mm and 280 mm. Therefore, 200 mm is used as the base number. The diameter R2 of the air inlet end face 4 of the air duct housing 1 is 200 mm / 0.7878≈253.8 mm.

[0038] 3) Calculate the diameter R3 of the outlet end face 5 of the air duct housing 1. The correction coefficient α3 is 0.2121, R3 = 330 mm + (330 mm × 0.2121)≈440mm;

[0039] 4) The height of the air duct housing is adjusted accordingly according to the thickness of the motor 3, and it is ensured that the distance d between the bottom surface of the wind wheel 2 and the air inlet end surface 4 of the air duct housing 1 is between 9 mm and 10 mm.

[0040] The present invention reasonably designs the sizes of the air inlet end face 4 and the air outlet end face 5 of the air duct housing 1 so that the entire air duct housing 1 presents a truncated cone structure that is larger at the top and smaller at the bottom. The product has a larger air outlet area, more uniform air outlet, and more stable wind speed. The distance range between the bottom surface of the wind wheel 2 and the air inlet end face 4 is reasonably adjusted according to the actual size of the motor 3, which helps to reduce airflow turbulence and noise, improve the stability of the operation of the entire air duct system, and enhance the overall performance.

[0041] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. An air duct system, comprising an air duct housing, a wind wheel and a motor, wherein the motor and the wind wheel are arranged in the air duct housing; Features: One end of the air duct housing is an air inlet end face, and the other end of the air duct housing is an air outlet end face, and the air inlet end face and the air outlet end face are connected by a side inclined surface to form an air duct cavity; The air inlet end surface is provided with an air inlet port, and the air outlet end surface is provided with an air outlet port; The cross-sectional area of ​​the air inlet end face is smaller than the cross-sectional area of ​​the air outlet end face, so that the air duct housing has a structure that is larger at the top and smaller at the bottom.

2. The air duct system according to claim 1, characterized in that: The air inlet end face and the air outlet end face are both circular, so that the air duct housing has a truncated cone structure.

3. The air duct system according to claim 1, characterized in that: An air guide ring is arranged at the air inlet port.

4. The air duct system according to claim 3, characterized in that: The inner side wall of the air guide ring is flush with the side wall of the air inlet port.

5. The air duct system according to claim 3, characterized in that: The air guide ring is arranged to protrude toward the air duct cavity, one end of the air guide ring is fixed to the air inlet end surface, and the other end of the air guide ring extends into the air inlet of the wind wheel.

6. The method for designing an air duct housing of an air duct system according to claim 1, characterized in that: The steps include: 1) Design the duct housing based on the backward-inclined wind wheel. The diameter of the backward-inclined wind wheel is a, and the height is b. The range of a is between 200mm and 280mm. First calculate the basic circle diameter R1 of the duct housing. The correction coefficient α1 is 0.787878. The basic circle diameter R1 of the duct housing is a / α1; 2) Calculate the diameter R2 of the air inlet end face of the air duct housing. The correction coefficient α2 is 0.7878. The wind wheel diameter a is between 200 mm and 280 mm. 200 mm is used as the base number. The diameter R2 of the air inlet end face of the air duct housing is the base number 200 / α2. 3) Calculate the outlet diameter R3 of the air duct housing. The correction coefficient α3 is 0.2121, R3 = R1 + (R1 × α3); 4) The height of the air duct housing is adjusted accordingly according to the thickness of the motor, and ensure that the distance d between the bottom surface of the wind wheel and the air inlet end surface of the air duct housing is between 9mm and 10mm.

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