TWI633260B - Non-vortex pipe type fan - Google Patents

Abstract

The invention provides a non-vortex tube type fan, which has a casing, a motor and an impeller. The motor and the impeller are arranged in the casing, and the motor is connected with the impeller. The impeller has blades and shaft holes, and the impeller can be a turbo impeller or a slant The flow impeller has a plurality of rear guide vanes between the outer casing of the motor and the casing; the invention mainly comprises a ratio of a diameter of the casing to a double distance from a midpoint of the blade to a center of the shaft hole of more than 1.25, and cooperates The design of the trailing vane, in turn, allows the dynamic pressure of the impeller output airflow to be positively non-vortexed by the trailing vane, and converts the dynamic pressure into static pressure, which improves the efficiency of the fan and reduces wear and tear.

Description

Vortexless fan

The present invention relates to a duct type fan, and more particularly to a non-vortex duct type fan.

The ducted fan is a widely used fan in today's society. It can be applied to various occasions such as commercial buildings, hospital air conditioners, chain supermarkets and households. The fan used in conventional ducted fans is a diagonal flow or shaft. Flow impeller design, the fan outlet is at high speed tangential direction speed, the air flow will directly rub with the air duct at a large angle, so that the air flow directly impacts the air duct, instead of smooth flow along the air duct, so that the air flow is easy to scatter and the flow field is uneven. In turn, a vortex is generated, which will rub against the pipe wall of the air duct, causing loss. In addition, the center of the airflow will also form a windless zone, and the airflow cannot be effectively sent to a distant place. Further, the general duct type fan is at the exit. The state of high wind speed is that the dynamic pressure is directly lost and cannot be recovered as static pressure;

In order to overcome the foregoing objectives, there is an urgent need for a non-vortexed duct type fan that is low in loss, efficient, and easier to overcome system impedance.

The present invention provides a vortex-free duct type fan, the main object of which is to provide a vortex-free duct type fan which is low in loss, efficient, and more easily overcomes system impedance.

To achieve the foregoing objective, the present invention provides a non-vortexed duct type fan comprising:

a housing having an air inlet, an air outlet, and a receiving space, the receiving space being in communication with the air inlet and the air outlet, the housing having an inner side wall facing the receiving space The housing has an inlet section, a body section and an outlet section. The air inlet is located at the inlet section, and the air outlet is located at the outlet section, and the diameter of the body section defining the housing is the first diameter. long;

a motor fixedly mounted in the receiving space, the motor having a motor housing and a driving shaft, the motor is provided to provide a rotating force;

An impeller having a wheel disc, a wheel cover and a plurality of blades disposed between the wheel disc and the wheel cover, wherein a center of the wheel disc is provided with a shaft hole, and the shaft hole is fixedly coupled with the drive shaft, so that the motor drives the motor The impeller rotates, the wheel cover has an air inlet, the air inlet communicates with the air inlet of the casing, and a first guiding space is formed between the blades, and each of the blades extends from the wheel to the wheel cover The direction is an oblique direction, and the blade has a blade midpoint along a midpoint of the oblique direction, the midpoint of the blade extending to a center of the shaft hole is a radius, and the radius defined by the second is a second path length The ratio of the first path length to the second path length is greater than 1.25;

A plurality of rear guide vanes are disposed between the inner side wall and the motor casing, and a second flow guiding space is formed between each of the rear guide vanes, and the first flow guiding space is in communication with the second guiding flow space.

It can be seen from the foregoing that the present invention mainly allows the impeller to output airflow by defining a ratio of the diameter of the casing to a double distance from the midpoint of the blade to the center of the shaft hole to be greater than 1.25, and matching the design of the rear guide vanes. The pressure is guided by the rear vane into a non-vortex flow, and the dynamic pressure is converted into a static pressure, which improves the efficiency of the fan and reduces the wear.

In order to enable the reviewing committee to have a better understanding and understanding of the purpose, features and functions of the present invention, please refer to the following for a detailed description of the following: The present invention provides a non-vortexed duct type fan, as shown in FIG. The housing 10 includes a housing 10 having an air inlet 11 , an air outlet 12 , and a receiving space 13 . The receiving space 13 communicates with the air inlet 11 and the air outlet 12 . The inner side wall 10A has an inner side wall 10A facing the receiving space 13. The housing 10 has an inlet section 101, a body section 103 and an outlet section 102. The air inlet 11 is located at the inlet. The section 101, the outlet 12 is located in the outlet section 102, the diameter of the body section 103 is larger than the diameter of the inlet section 101 and the outlet section 102, the diameter of the body section 103 defining the housing 10 is the first diameter L1; A motor 20 is fixedly mounted in the accommodating space 13. The motor 20 has a motor housing 21 and a driving shaft 22 for supplying a rotating force. An impeller 30 has a wheel 31 and a wheel cover. 32 and a plurality of blades 33 disposed between the wheel 31 and the wheel cover 32, The disk 31 has a central portion 31A and a slanted portion 31B. The central portion 31A is in a circular shape. The inclined portion 31B is connected to the outer periphery of the central portion 31A and inclined at an angle. The disk 31 is The other end of the inclined portion 31B connected to the central portion 31A has a first circumference 311, the first The peripheral edge 311 is for guiding the airflow. The central portion 31A is centrally provided with a shaft hole 312. The shaft hole 312 is fixedly coupled to the drive shaft 22, so that the motor 20 drives the impeller 30 to rotate. One end of the wheel cover 32 has a second peripheral edge 321 surrounding the air inlet 322, the air inlet 322 communicating with the air inlet 11 of the housing 10, the other end of the wheel cover 32 having a third peripheral edge 323, the blades 33 is arranged in a radial arrangement between the wheel 31 and the wheel cover 32. A first flow guiding space 33A is formed between the blades 33. In the embodiment, the impeller 30 can be a turbo impeller. Or a diagonal flow impeller, preferably, defining that each of the blades 33 extends perpendicularly from the wheel 31 to a direction in which the wheel cover 32 extends is an oblique direction X along which the blade 33 is located (ie, One-half) has a blade midpoint 331, the blade midpoint 331 extends to the center of the shaft hole 312 by a radius R, and the radius R defined by the second is a second path length L2. The ratio of the length L1 to the second length L2 is greater than 1.25. Preferably, the ratio of the first path length L1 to the second path length L2 is 1.25. And a plurality of rear guide vanes 40 disposed between the inner side wall 10A and the motor casing 21, and a second flow guiding space 40A is formed between each of the rear guide vanes 40, the first guiding space 33A and the first The two flow guiding spaces 40A are connected.

In the preferred embodiment, as shown in FIG. 3, FIG. 5 to FIG. 7, the central portion 31A has a connecting outer peripheral edge 31R, and the connecting outer peripheral edge 31R is connected to the inclined portion 31B, and each of the blades 33 has an inlet end. 332 and an output end 333, the angle between the end 332 and the outer peripheral edge 31R of the connection is a first angle θ ₁ , and the second end 323 has a second angle θ ₂ between the end 333 and the third end 323. The angle of the first angle θ ₁ is between 10 and 35 degrees, and the angle of the second angle θ ₂ is between 10 and 45 degrees.

The above is the structural configuration of the non-vortex-type duct type fan of the present invention, and its use method and its function are detailed as follows: The vortex-free duct type fan of the present invention mainly transmits the kinetic energy of the rotation through the motor to drive the impeller to rotate, so that the airflow is introduced from the air inlet 11 and flows through the first air guiding space 33A through the air inlet 322 of the wheel cover 32. Then, the second flow guiding space 40A flows again, and finally is discharged from the air outlet 12.

It can be seen from the foregoing that the present invention mainly defines a ratio of the diameter of the body section 103 of the casing 10 to twice the distance from the center point 331 of the blade to the center of the shaft hole 312, and is designed to match the design of the rear guide vanes 40. In turn, the dynamic pressure of the output airflow of the impeller 30 is guided by the rear vane 40 into a non-vortex flow, and the dynamic pressure is converted into a static pressure, thereby improving the efficiency of the fan and reducing the wear.

In addition, it is worth mentioning that after the creation, the guide vanes 40 are mainly used to guide the airflow to the airflow before leaving the fan and before entering the pipeline, and convert the dynamic pressure into static pressure.

After actual testing, the wind speed measured at the fan outlet is 8.3m/s and 6.4m/s at the high wind speed (3450rpm) of the non-vortex tube type fan and the conventional pipe type fan of the present invention, and is measured at the fan outlet. The obtained air volume is 3.91 cmm and 3.02 cmm, respectively. The wind speed measured by the fan outlet at the low wind speed (2400 rpm) is 5.6 m/s, the air volume is 2.64 cmm, and the conventional technology is used at low wind speed (3000 rpm). The measured wind speed at the exit is 5.7m/s and the air volume is 2.69cmm. See Table 1 below for details;

In addition, after the actual measurement of the non-vortex-type duct type fan of the present invention, compared with the conventional conventional duct type fan, the speed of the non-vortex-type duct type fan of the present invention can be reduced before the same air volume (2.6 to 2.7 cmm) is obtained. 600 rpm, that is, the vortex-free duct type fan of the present invention can achieve the same air volume at a lower rotational speed; and the noise sound power of the present invention is also reduced by 4.8 dB compared with the conventional duct type fan.  <TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> </td><td> </td><td> the invention</td>< Td> conventional technology</td></tr><tr><td> high speed 3450rpm </td><td> exit wind speed</td><td> 8.3m/s </td><td> 6.4m /s </td></tr><tr><td> High speed 3450rpm </td><td> Outlet air volume</td><td> 3.91cmm </td><td> 3.02 cmm </td>< /tr><tr><td> Low Speed 3000rpm </td><td> Exit Wind Speed</td><td> </td><td> 5.7/ms </td></tr><tr><td > Low speed 3000rpm </td><td> Outlet air volume</td><td> </td><td> 2.69cmm </td></tr><tr><td> Low speed 2400rpm </td><td > Outlet wind speed</td><td> 5.6/ms </td><td> </td></tr><tr><td> Low speed 2400rpm </td><td> Outlet air volume</td>< Td> 2.64cmm </td><td> </td></tr></TBODY></TABLE> Table 1  

10‧‧‧shell

101‧‧‧ entrance section

102‧‧‧Exit section

103‧‧‧ Body segment

10A‧‧‧ inner side wall

11‧‧‧Air inlet

12‧‧‧air outlet

13‧‧‧ Included space

20‧‧‧Motor

21‧‧‧Motor housing

22‧‧‧Drive shaft

30‧‧‧ Impeller

31‧‧‧ Roulette

31A‧‧‧ Central Department

31B‧‧‧ inclined section

31R‧‧‧Connecting the outer periphery

311‧‧‧First Week

312‧‧‧ shaft hole

32‧‧‧ wheel cover

321‧‧‧second circumference

322‧‧‧air inlet

323‧‧‧ Third Week

33‧‧‧ leaves

331‧‧‧ blade midpoint

332‧‧‧Into the end

333‧‧‧Begin

33A‧‧‧First Diversion Space

40‧‧‧ rear guide vanes

40A‧‧‧Second diversion space

X‧‧‧ tilt direction

R‧‧‧ Radius

L1‧‧‧First path length

L2‧‧‧Second long

θ ₁ ‧‧‧first angle

θ ₂ ‧‧‧second angle

Figure 1 is a perspective view of a non-vortexed duct type fan of the present invention.

2 is an exploded perspective view of the non-vortexed duct type fan of the present invention.

Figure 3 is a perspective cross-sectional view of the non-vortexed duct type fan of the present invention.

Figure 4 is a cross-sectional view of the non-vortexed duct type fan of the present invention.

Figure 5 is a partial cross-sectional view showing the impeller of the non-vortexed duct type fan of the present invention.

Figure 6 is a side view of the impeller of the non-vortexed duct type fan of the present invention.

Figure 7 is a cross-sectional view taken along line 7-7 of Figure 6.

Claims (4)

A vortex-free duct type fan includes: a casing having an air inlet, an air outlet, and a accommodating space, wherein the accommodating space is in communication with the air inlet and the air outlet, and the housing has an inner side wall. The inner side wall faces the receiving space, and the housing has an inlet section, a body section and an outlet section. The air inlet is located at the inlet section, and the air outlet is located at the outlet section, and the shell is defined The body of the body has a diameter of a first diameter; a motor is fixedly mounted in the receiving space, the motor has a motor casing and a driving shaft, the motor is provided for providing a rotating force; and an impeller has a wheel a disk, a wheel cover and a plurality of blades disposed between the wheel and the wheel cover, wherein the wheel disk is provided with a shaft hole in the center thereof, the shaft hole is fixedly coupled with the driving shaft, so that the motor drives the impeller to rotate, the wheel The cover has an air inlet, the air inlet communicates with the air inlet of the casing, and a first guiding space is formed between the blades, and the direction of each of the blades extending from the wheel to the wheel cover is defined as a tilt Direction, the blade along the oblique direction The midpoint has a midpoint of the blade, the distance from the midpoint of the blade to the center of the shaft hole is a radius, and the radius defined by the second is a second path length, and the ratio of the first path length to the second path length is greater than 1.25 And a plurality of rear guide vanes disposed between the inner side wall and the motor casing, and a second flow guiding space is formed between each of the rear guide vanes, the first guiding space is in communication with the second guiding space; The wheel has a central portion and a slanted portion, the central portion is in a circular shape, the inclined portion is connected to the outer periphery of the central portion and inclined at an angle, and the wheel is at the inclined portion and the central portion The other end of the connection has a first circumference for guiding the air flow, the shaft hole is disposed at the central portion, and one end of the wheel cover has a second circumference, the second circumference surrounds the air inlet, the wheel cover The other end has a third circumference, the central portion has a connecting outer periphery, and the connecting outer periphery is connected with the inclined portion, each of the blades Having an inlet end and an outlet end, the angle between the inlet end and the outer periphery of the connection is a first angle, and the second end has a second angle between the outlet end and the third circumference. At 10 to 35 degrees, the angle of the second angle is between 10 and 45 degrees. The vortex-free duct type fan according to claim 1, wherein the ratio of the first path length to the second path length is between 1.25 and 2. The vortex-free duct type fan according to claim 1, wherein the blades are radially arranged between the wheel and the wheel cover. The vortex-free duct type fan according to claim 1, wherein the impeller is a turbo impeller or a diagonal flow impeller.