A wind channel and purifier with a backward-inclined fan wheel

Abstract

The utility model belongs to air outlet air duct structure design technical field, especially the air duct and purifier with back -tilt fan wheel, including upper shell, upper shell outer wall is equipped with air outlet, upper shell upper end is fixed with top cover, top cover center position is fixed with motor, motor output end is connected with back -tilt fan wheel, and back -tilt fan wheel rotates in the upper shell inside, and upper shell is fixed on the lower shell upper end, and the lower shell is divided into the air inlet section air duct and the contraction section air duct from below to above in, and the inner wall of contraction section air duct is contracted upwards in fluid type, and start motor, drive back -tilt fan wheel rotation, and back -tilt fan wheel will air swing to all around, form airflow, and airflow releases outward from the air outlet of upper shell outer wall setting, and back -tilt fan wheel lower part forms negative pressure, and the air of outside enters the air inlet section air duct, and flows upwards, passes through contraction section air duct, and the speed distribution gradient change of airflow is less, and the wind pressure loss is less, and airflow speed is fast and stable.

Description

Technical Field

[0001] This utility model belongs to the technical field of air outlet duct structure design, and particularly relates to an air duct and purifier with a backward-inclined impeller. Background Technology

[0002] Existing air outlet ducts are usually pipes that suddenly expand, suddenly narrow, or bend. When airflow passes through such channels, it is easy to cause fluid turbulence and loss of air pressure, resulting in a decrease in air speed.

[0003] For example, patent application number CN202010146571.1 describes a dual-channel inlet and outlet air fan, which includes a first channel and a second channel that isolate the airflow from each other. The first channel and the second channel are arranged intersectingly, and the first channel passes through the second channel. The system also includes a drive mechanism, a first axial flow fan respectively disposed in the first channel, and a second axial flow fan disposed in the second channel. The drive mechanism drives the first axial flow fan and the second axial flow fan to rotate through a main shaft. The part where the main shaft passes through the first channel is sealed. However, the disadvantage of this technical solution is that the air duct at the front end of the first impeller is curved, which can easily cause fluid turbulence and loss of air pressure, and slow down the air speed. Utility Model Content

[0004] The purpose of this utility model is to provide an air duct and purifier with a backward-curved impeller to solve the problems in the prior art. The specific technical solution is as follows:

[0005] A duct with a backward-curved impeller includes an upper shell with an air outlet on the outer wall of the upper shell. A top cover is fixed to the upper end of the upper shell, and a motor is fixed at the center of the top cover. The output end of the motor is connected to the backward-curved impeller, which rotates inside the upper shell. The upper shell is fixed to the upper end of the lower shell. The lower shell is divided into an air inlet section and a converging section from bottom to top. The inner wall of the converging section is fluid-shaped and converging upward.

[0006] Furthermore, the air outlet is located between the lower end of the backward-curved impeller and the top cover, and the height of the air outlet is between 0.5 and 1.5 times the height of the backward-curved impeller.

[0007] Furthermore, the distance between the lower end of the backward-curved impeller and the upper end of the filter screen is between 0.2 and 0.6 times the diameter of the backward-curved impeller.

[0008] Furthermore, the tilting impeller includes a rear plate and a front plate, with multiple fan blades disposed between the rear plate and the front plate, and an air inlet hole disposed at the lower end of the front plate.

[0009] Furthermore, the rear plate, the front plate, and the two adjacent fan blades form an air outlet, and the rear plate at the air outlet extends horizontally outward.

[0010] Furthermore, a filter screen is inserted at the connection between the air inlet section duct and the air contraction section duct.

[0011] Furthermore, a filter screen cover is provided on the side of the lower shell.

[0012] Furthermore, an air inlet is provided at the lower end of the lower shell.

[0013] Furthermore, a support column is provided at the lower end of the lower shell.

[0014] An air purifier comprising an air duct with a backward-curved impeller as described in any of the preceding claims.

[0015] The advantages of this utility model are:

[0016] When the motor is started, the impeller rotates and throws air in all directions, forming an airflow. The airflow is released outward from the air outlet set on the outer wall of the upper shell. A negative pressure is formed below the impeller, and the outside air enters the air inlet section and flows upward. After passing through the air constriction section, the speed distribution gradient of the airflow changes less, the wind pressure loss is small, and the airflow flows into the impeller at a faster and more stable speed and shape, and is thrown out by the impeller. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the overall structure of the present invention. Figure 3 ;

[0020] Figure 4 This is a schematic diagram of the wind turbine structure of this utility model. Figure 1 ;

[0021] Figure 5 This is a schematic diagram of the wind turbine structure of this utility model. Figure 2 ;

[0022] Figure 6 This is a schematic diagram of the dual-duct system structure of this utility model. Figure 1 ;

[0023] Figure 7 This is a schematic diagram of the dual-duct system structure of this utility model. Figure 2 ;

[0024] Figure 8 This is a schematic diagram of the dual-duct system structure of this utility model. Figure 3 ;

[0025] Explanation of markings in the diagram:

[0026] 1. Upper shell; 2. Top cover; 3. Motor; 4. Air outlet; 5. Rear plate; 6. Fan blade; 7. Front plate; 8. Lower shell; 9. Air inlet section duct; 10. Converging section duct; 11. Filter screen; 12. Filter screen cover; 13. Air inlet hole; 14. Support column; 49. Curve 1; 50. Curve 2; 51. Curve 3; 52. Dual-axis motor. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Example 1

[0030] like Figure 1-8 As shown, a duct with a backward-curved impeller includes an upper shell 1, an air outlet 4 on the outer wall of the upper shell 1, a top cover 2 fixed to the upper end of the upper shell 1, a motor 3 fixed at the center of the top cover 2, the output end of the motor 3 being connected to the backward-curved impeller, the backward-curved impeller rotating inside the upper shell 1, the upper shell 1 being fixed to the upper end of the lower shell 8, the lower shell 8 being divided into an air inlet section duct 9 and a converging section duct 10 from bottom to top, the inner wall of the converging section duct 10 being fluid-shaped and converging upward;

[0031] The working principle of the above technical solution is as follows: The motor 3 is started, which drives the backward-curved impeller to rotate. The backward-curved impeller throws the air to all sides to form an airflow. The airflow is released outward from the air outlet 4 set on the outer wall of the upper shell 1. A negative pressure is formed below the backward-curved impeller. The outside air enters the air inlet section duct 9 and flows upward. After passing through the contraction section duct 10, the speed distribution gradient of the airflow changes little and the wind pressure loss is small. The airflow flows into the backward-curved impeller at a faster and more stable speed and shape and is thrown out by the backward-curved impeller.

[0032] For the contraction section of the duct 10 designed for sudden expansion, due to fluid inertia, fluid particles cannot immediately adhere to the wall at the sudden expansion point, but leave the wall at the sharp corner, resulting in a series of vortices. As the fluid flows, the fluid particles will occupy the entire cross-section of the duct.

[0033] For the contraction section duct 10 designed to narrow abruptly, the fluid first separates at the corner of the main pipe, forming a separation zone, and then another separation zone forms in the smaller pipe. Finally, it occupies the entire cross-section of the pipe.

[0034] For the converging section duct 10 designed as a bend, the fluid flows through the bend due to the different pressure distribution on the inner and outer walls, causing the streamlines to bend and subject to centripetal force, with the pressure on the outer side being greater than that on the inner side. Fluid particles tend to flow from the outer side to the inner side of the duct wall. At the same time, the flow velocity decreases at the bend, causing flow separation, forming vortices, increasing losses, and creating secondary flow.

[0035] Therefore, the contraction section duct 10 is designed as a fluid-type upward contraction to reduce local wind pressure loss.

[0036] Example 2

[0037] like Figure 1-8 As shown, the air outlet 4 is located between the lower end of the backward-curved impeller and the top cover 2, and the height of the air outlet 4 is between 0.5 times and 1.5 times the height of the backward-curved impeller.

[0038] The working principle of the above technical solution is as follows: the height of the impeller is set to H1 (mm), the diameter of the impeller is d (mm), the opening height of the air outlet is H2 (mm), and the height of the converging section air duct is H3 (mm).

[0039] The airflow velocities at the side air inlet 13 and the air outlet 4 are 2-3 m / s and 5-7 m / s respectively. Due to the rotation of the impeller, the guidance of the air duct and the impeller back plate, and the height of the air outlet, the airflow will rotate upward and flow out of the air outlet 4.

[0040] There is a noticeable swirling phenomenon near the air outlet 4 of the impeller, and the speed is not low. This is because there is a suddenly expanding airflow channel from the impeller outlet to the air outlet 4. The airflow is guided by the air duct and will flow into the area of ​​the suddenly expanding airflow channel, which will cause pressure loss to a certain extent. The high-speed airflow will drive the low-speed airflow at the edge of the sudden expansion section to flow and form a vortex, which will cause a certain degree of noise increase.

[0041] Controlling H2 (mm) between 0.5H1 (mm) and 1.5H1 (mm) can reduce wind pressure loss and wind noise.

[0042] Example 3

[0043] like Figure 1-8 As shown, the lower end of the backward-curved impeller is flush with the lower end of the upper shell 1, and the distance between the lower end of the backward-curved impeller and the upper end of the filter screen 11 is between 0.2 and 0.6 times the diameter of the backward-curved impeller.

[0044] The working principle of the above technical solution: The experimental test selected three types of air outlet ducts with H3=110mm, H3=70mm and H3=30mm respectively in the contraction section duct 10, and carried out fluid simulation experiments under the same configuration conditions, wherein the diameter of the backward inclined impeller d=230mm;

[0045] Simulation results show that when H3 increases from 70mm to 110mm, the performance improves by about 4.8%, but when L decreases from 70mm to 30mm, the performance decreases by about 14%.

[0046] The larger the length H3 of the contraction section air duct 10, the better the performance; however, as the length H3 of the contraction section air duct 10 continues to increase, the performance improvement will become smaller and smaller. At the same time, an excessively long contraction section air duct 10 will also affect the product size and appearance. Therefore, controlling H3 (mm) between 0.2d (mm) and 0.6d (mm) can reduce pressure loss and achieve a higher filter utilization rate.

[0047] Example 4

[0048] like Figure 1-8 As shown, the tilting impeller includes a rear disc 5 and a front disc 7, with multiple fan blades 6 disposed between the rear disc 5 and the front disc 7, and an air inlet hole disposed at the lower end of the front disc 7.

[0049] The rear plate 5, the front plate 7, and the two adjacent fan blades 6 form an air outlet, and the rear plate 5 at the air outlet extends horizontally outward.

[0050] The working principle of the above technical solution is as follows: the rear plate 5 at the air outlet extends horizontally outward and has a guiding function, which allows the airflow to flow out approximately horizontally and be released directly outward from the air outlet 4. The front plate 7 at the air outlet is curved downward, which can increase the diameter of the air outlet and increase the air volume.

[0051] Example 5

[0052] like Figure 1-8 As shown, a filter screen 11 is inserted at the connection between the air inlet section duct 9 and the air contraction section duct 10; a filter screen cover 12 is provided on the side of the lower shell 8;

[0053] The lower shell 8 is provided with an air inlet 13 at its lower end;

[0054] The working principle of the above technical solution is as follows: external airflow can enter the air outlet duct through the air inlet 13. The airflow passes through the filter screen 11 in the air outlet duct, and then passes through the backward-curved impeller and is thrown out from the air outlet 4. The energy recovery component can recover the wind energy of the fluid thrown out from the air outlet 4 and rotate it into mechanical energy, which gathers the external wind at the air inlet 13, thereby accelerating the air intake of the air outlet duct.

[0055] Example 6

[0056] like Figure 1-8 As shown, the lower end of the lower shell 8 is provided with a support column 14;

[0057] The working principle of the above technical solution is as follows: the support column 14 plays a role in supporting and fixing the overall air outlet duct.

[0058] Example 7

[0059] like Figure 1-8 As shown, the diameter of the end of the contraction section air duct 10 near the filter screen 11 is larger than the diameter of the end near the impeller;

[0060] The contraction section air duct 10 includes curve 1 49, curve 2 50 and curve 3 51. Curve 1 49, curve 2 50 and curve 3 51 together form a fluid-type structure that is narrow at one end and wide at the other end.

[0061] The starting position of the air outlet 4 is: point A, which is the lower end of the exhaust port of the wind turbine blade 6;

[0062] The end point of air outlet 4 is at point B, which is the inner top of the casing;

[0063] The range of air outlet 4 is H2; where H2 is from point A to point B.

[0064] The wind turbine blade 6 is located between points A and B;

[0065] The height of wind turbine blade 6 is H1, where the lower end of wind turbine blade 6 is the starting position of H1.

[0066] The size of H1 is less than or equal to the size of H2;

[0067] The height of the contraction section air duct 10 is H3. The starting point of H3 near the end of the wind turbine is at point C, and the range of H3 is 0.2-1.0 times the diameter d of the wind turbine.

[0068] The opening height of the air outlet 4 is between 0.3 and 1.5 times the height H of the impeller; and the opening position of the air outlet 4 is any position and any range within H2.

[0069] Wherein, the wind turbine height H is the distance between the lower end of the wind turbine inlet and the upper end of the wind turbine outlet;

[0070] Example 8

[0071] like Figure 1-8 As shown, the upper shell 1 and the lower shell 8 are provided with an air duct system, and the air duct system is provided with a drive mechanism. The drive mechanism is either a dual-axis motor 52 or a single-axis motor 3. The air duct system is a single air duct system or a multi-air duct system.

[0072] The multi-duct system has multiple sets of wind turbines; and the drive end of each wind turbine forms a set of ducts with the wind turbine, and each set of ducts is an independent duct; the drive mechanism is a dual-shaft motor 52 or multiple single-shaft motors 3;

[0073] When it is a single-duct system, the drive mechanism is a single-axis motor 3, and the output end of the single-axis motor 3 is connected to the drive end of the impeller in the duct system.

[0074] When it is a multi-duct system, the drive mechanism is a dual-shaft motor 52, and the two output ends of the dual-shaft motor 52 are respectively connected to the drive ends of each impeller in the dual-duct system.

[0075] When the system is a multi-duct system, and the drive mechanism is a single-axis motor 3, the single-axis motor 3 is set up in multiple groups, and the output end of each single-axis motor is connected to the drive end of each impeller in the dual-duct system.

[0076] Example 9

[0077] like Figure 1-8 As shown, an air purifier includes an air duct with a backward-curved impeller as described in any of the above claims;

[0078] The working principle of the above technical solution is as follows: The purifier equipped with the air duct with the backward-curved impeller has the advantages of small air pressure loss at the outlet and fast and stable airflow speed.

[0079] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A duct with a backward-inclined impeller, characterized in that, It includes an upper shell (1), an air outlet (4) on the outer wall of the upper shell (1), a top cover (2) fixed at the upper end of the upper shell (1), a motor (3) fixed at the center of the top cover (2), the output end of the motor (3) is connected to the backward-curved impeller, the backward-curved impeller rotates inside the upper shell (1), the upper shell (1) is fixed at the upper end of the lower shell (8), the lower shell (8) is divided into an air inlet section duct (9) and a constriction section duct (10) from bottom to top, the inner wall of the constriction section duct (10) is fluid-shaped and constricts upward.

2. The air duct with a backward-inclined impeller according to claim 1, characterized in that, The air outlet (4) is located between the lower end of the backward-curved impeller and the top cover (2), and the height of the air outlet (4) is between 0.5 times and 1.5 times the height of the backward-curved impeller.

3. A duct with a backward-inclined impeller according to claim 2, characterized in that, The distance between the lower end of the backward-curved impeller and the upper end of the filter screen (11) is between 0.2 and 0.6 times the diameter of the backward-curved impeller.

4. A duct with a backward-inclined impeller according to claim 3, characterized in that, The rear-inclined impeller includes a rear plate (5) and a front plate (7), with multiple fan blades (6) between the rear plate (5) and the front plate (7), and an air inlet at the lower end of the front plate (7).

5. A duct with a backward-inclined impeller according to claim 4, characterized in that, The rear plate (5), the front plate (7), and the two adjacent fan blades (6) form an air outlet, with the rear plate (5) at the air outlet extending horizontally outward.

6. A duct with a backward-inclined impeller according to claim 5, characterized in that, A filter screen (11) is inserted at the connection between the air inlet section duct (9) and the air contraction section duct (10).

7. A duct with a backward-inclined impeller according to claim 6, characterized in that, The lower shell (8) is provided with a filter cover (12) on its side.

8. A duct with a backward-inclined impeller according to claim 7, characterized in that, The lower shell (8) is provided with an air inlet (13) at its lower end.

9. A duct with a backward-inclined impeller according to claim 8, characterized in that, The lower shell (8) is provided with a support column (14) at its lower end.

10. A purifier, characterized in that, The wind duct with a backward-inclined impeller as described in any one of claims 1-9.

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