Fan, control method, and central purification system

Abstract

The application discloses a fan, a control method and a central purification system. The fan comprises a volute, an air outlet grille and an adjusting member. The volute has an air outlet. The air outlet grille has a plurality of blades. The blades are arranged on the air outlet in a spaced and rotatable manner along the up-down direction. The plurality of blades move synchronously. The adjusting member is arranged on at least one blade and is used for driving the blade provided with the adjusting member to rotate relative to the volute. Thus, the uniformity of the air flow of the air outlet of the fan is higher. The air flow concentration in the lower side area of the air outlet can be avoided. Furthermore, the negative pressure area in the upper side of the air outlet can be avoided. The working noise of the fan is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of household appliances, in particular to a fan, a control method and a central purification system. BACKGROUND

[0002] In the related art, the central purification system uses a power distribution system to uniformly distribute air volume to each merchant, and uses a fan and a purifier to extract and filter oil fume in a flue, which can effectively purify air, and thus can be applied in shopping malls, hotels and the like.

[0003] As a power device for extracting oil fume, air enters a volute after being accelerated by an impeller, and flows to an outlet along a volute profile. However, due to the effects of inertia and gravity, most of the air will be concentrated on the lower side of the outlet, which will cause uneven flow at the outlet of the fan, and due to the influence of a volute tongue, a small range of negative pressure area will also be generated, and thus noise will be generated. SUMMARY

[0004] The present application aims to at least solve one of the problems in the prior art. To this end, one object of the present application is to provide a fan with uniform air outlet and low working noise.

[0005] The present application also provides a control method for the above fan.

[0006] The present application further provides a central purification system using the above fan and controlled based on the above control method.

[0007] According to the fan of the first aspect of the present application, the fan comprises a volute, an air outlet grille and an adjusting member, the volute has an air outlet, the air outlet grille has a plurality of blades, the plurality of blades are spaced apart in the up-down direction and rotatably arranged on the air outlet, the plurality of blades move synchronously, and the adjusting member is arranged on at least one of the blades and used to drive the blade provided with the adjusting member to rotate relative to the volute.

[0008] According to the fan of the present application, the uniformity of the air flow at the air outlet of the fan is higher, the air flow concentration in the lower side of the air outlet can be avoided, and thus the negative pressure area in the upper side of the air outlet can be avoided, so as to improve the working noise of the fan.

[0009] According to some embodiments of the present application, the air outlet grille further comprises a connecting member connected with the plurality of blades and adapted to drive the plurality of blades to move synchronously.

[0010] Further, the adjusting member is arranged on the air inlet side of the blade, and the connecting member is arranged on the air outlet side of the blade.

[0011] In some embodiments, on the air inlet side, the spacing between adjacent blades gradually increases from top to bottom.

[0012] In some embodiments, on the air outlet side, the spacing between adjacent blades is equal.

[0013] According to some embodiments of the present application, the blades are arc-shaped in the airflow direction.

[0014] According to some embodiments of the present application, the fan further comprises a driving member arranged in the volute and configured to transmit power to the adjusting member.

[0015] Further, the adjusting member is configured as an adjusting rod, and the adjusting rod is formed as a non-circular rod.

[0016] The control method of the fan according to the second aspect of the embodiments of the present application comprises:

[0017] obtaining an upper layer flow rate U1 and a lower layer flow rate U2 of an air outlet region; wherein the air outlet region is divided into an upper layer region and a lower layer region in the up-down direction, the upper layer flow rate is the flow rate of the gas in the upper layer region, and the lower layer flow rate is the flow rate of the gas in the lower layer region;

[0018] adjusting the included angle between the air inlet side end of the blade and the air outlet based on the flow rate difference between the upper layer flow rate and the lower layer flow rate.

[0019] Further, the adjusting the included angle between the air inlet side end of the blade and the air outlet based on the flow rate difference between the upper layer flow rate and the lower layer flow rate specifically comprises:

[0020] if the flow rate difference is less than or equal to a first threshold value, adjusting the angle of the blade with a first adjustment threshold value;

[0021] if the flow rate difference is greater than the first threshold value, adjusting the angle of the blade with a second adjustment threshold value, wherein the first adjustment threshold value is less than the second adjustment threshold value.

[0022] Further, the control method further comprises adjusting the angle of the blade with the second adjustment threshold value, and adjusting the angle of the blade with the first adjustment threshold value after the flow rate difference is less than or equal to the first threshold value.

[0023] The central purification system according to the third aspect of the embodiments of the present application comprises the fan described in the above embodiments and is controlled based on the control method described in the above embodiments.

[0024] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings in which:

[0026] Figure 1 is a schematic view of a fan according to an embodiment of the present application;

[0027] Figure 2 is a sectional view of a fan according to an embodiment of the present application;

[0028] Figure 3 is another schematic view of a fan according to an embodiment of the present application;

[0029] Figure 4 is a schematic view of an air outlet grille according to an embodiment of the present application;

[0030] Figure 5 is a flowchart of a control method according to an embodiment of the present application.

[0031] Reference Signs:

[0032] fan 100,

[0033] volute 10, air outlet 11,

[0034] air outlet grille 20, blade 21, connecting member 22,

[0035] adjusting member 30, driving member 40, detecting member 50,

[0036] air inlet side a, air outlet side b. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described below in detail with reference to the accompanying drawings, in which like or similar elements are denoted by like reference numerals throughout the several views. The embodiments described below are exemplary only, and are not to be understood as limiting the present application.

[0038] Reference is made to Figures 1-5 describing a fan 100, a control method, and a central purification system according to embodiments of the present application.

[0039] As shown in Figure 1 and Figure 4 , a fan 100 according to an embodiment of the first aspect of the present application includes a volute 10, an air outlet grille 20, and an adjusting member 30.

[0040] The volute 10 has an air outlet 11, the air outlet grille 20 has a plurality of blades 21, the blades 21 are arranged on the air outlet 11 in the up-down direction and can rotate, the plurality of blades 21 move synchronously, the adjusting part 30 is arranged on at least one blade 21 and is used for driving the blade 21 provided with the adjusting part 30 to rotate relative to the volute 10.

[0041] Specifically, the volute 10 is provided with an impeller, the impeller drives airflow to enter the volute 10 from the air inlet in the axial direction of the volute 10 and can flow out from the air outlet 11 in the lateral direction of the volute 10, the air outlet 11 is provided with the air outlet grille 20, and the air outlet grille 20 can guide the outflowing airflow.

[0042] Exemplarily, the air outlet grille 20 further comprises a connecting part 22 connected with the plurality of blades 21, the plurality of blades 21 are adapted to move synchronously under the driving of the connecting part 22, and the adjusting part 30 can be configured as an adjusting rod and the connecting part 22 can be configured as a connecting rod.

[0043] It can be understood that the airflow enters the volute 10 after being accelerated by the impeller and flows to the outlet along the profile line of the volute 10. However, due to the effects of inertia and gravity, most of the airflow will be concentrated on the lower side of the air outlet 11, which will cause uneven flow of the air outlet 11 of the fan 100. Meanwhile, the air outlet grille 20 is installed on one side of the air outlet 11 of the volute 10, the left and right walls of the volute 10 are respectively provided with through holes corresponding to the adjusting part 30, the adjusting part 30 is fixed to the left and right sides of the volute 10 through the through holes, and then the air outlet grille 20 is fixed, and the uppermost blade 21 of the air outlet grille 20 needs to be in contact with the volute tongue during installation, so as to close the space between the volute tongue and the flange of the air outlet 11, so that the fluid directly flows into the external air pipe after flowing out of the air outlet 11, thereby avoiding the negative pressure caused by the flowing air into the space between the volute tongue and the flange of the air outlet 11, so as to improve the working noise of the fan 100.

[0044] Based on this, the adjusting part 30 is further arranged on the air outlet grille 20, the blade 21 provided with the adjusting part 30 is driven to rotate by the adjusting part 30, the plurality of blades 21 are connected through the connecting part 22, the blade 21 provided with the adjusting part 30 is driven to rotate at the same time, the connecting part 22 is driven to move synchronously, and the other blades 21 are driven to move synchronously, so as to adjust the deflection angle of the plurality of blades 21, so as to achieve the purpose of rectification and make the uniformity of the airflow of the air outlet 11 higher.

[0045] According to the fan 100 of the embodiment of the present application, the uniformity of the airflow of the air outlet 11 of the fan 100 is higher, the airflow concentration in the lower side area of the air outlet 11 can be avoided, and then the negative pressure area in the upper side of the air outlet 11 can be avoided, so as to improve the working noise of the fan 100.

[0046] Referring to Figure 4As shown, according to some embodiments of the present application, the adjusting member 30 is arranged at the air inlet side a of the blade 21, and the connecting member 22 is arranged at the air outlet side b of the blade 21.

[0047] That is, the adjusting member 30 adjusts the angle between each blade 21 and the air outlet direction of the air outlet 11 at the air inlet side a of the blade 21, and makes the spacing between adjacent blades 21 gradually increase from top to bottom at the air inlet side a, and the spacing between adjacent blades 21 is equal at the air outlet side b.

[0048] Therefore, not only can the problem of uneven air flow of the air outlet 11 be improved, and the problem of local negative pressure area between the volute tongue and the fixed flange of the air outlet 11 be solved, but also the turbulent noise and flow turbulence phenomenon caused by turbulent pressure pulsation in the area of the air outlet 11 can be reduced, the energy loss can be reduced, and the energy efficiency of the fan 100 can be improved.

[0049] Among them, the end of the blade 21 can be provided with a connecting flange, the connecting flange at the air inlet side a is hinged with the adjusting member 30, the connecting flange at the air outlet side b is hinged with the connecting member 22, and the adjusting member 30 can be one, arranged on one of the plurality of blades 21, the blade 21 provided with the adjusting member 30 is formed as a driving blade 21, and the other blades 21 can be linked under the driving of the connecting member 22, and formed as a driven blade 21, the adjusting member 30 can be two or more, such as: the number of adjusting members 30 is consistent with the number of blades 21, then the plurality of blades 21 are all formed as driving blades 21.

[0050] As shown in Figure 2 , Figure 3 and Figure 4 As shown, according to some embodiments of the present application, the blade 21 is arc-shaped in the airflow direction, thereby guiding the airflow through the arc-shaped blade 21, reducing the impact on the blade 21, and improving the flow effect of the air outlet grille 20.

[0051] As shown in Figure 1 , according to some embodiments of the present application, the fan 100 further comprises a driving member 40, which is arranged in the volute 10 and is used to transmit power to the adjusting member 30. Therefore, the driving member 40 can drive the adjusting member 30 to rotate, in the embodiment where the adjusting member 30 is one, the power output end of the driving member 40 can be directly connected with the adjusting member 30, and in the embodiment where the adjusting member 30 is multiple, a transmission structure is arranged between the driving member 40 and the adjusting member 30, the transmission structure has multiple power output parts, and each power output part is connected with one adjusting member 30.

[0052] Preferably, the adjusting member 30 is configured as an adjusting rod, and the adjusting rod is formed as a non-circular rod, such as a hexagonal rod, a rectangular rod, etc., so that the power transmission effect between the adjusting member 30 and the blade 21 is better, and the adjustment response speed of the blade 21 is faster.

[0053] As shown in the control method of the fan 100 according to the second aspect of the present application, the method comprises: Figure 5

[0054] Obtaining the upper layer flow rate U1 and the lower layer flow rate U2 of the area of the air outlet 11 (a detection member 50 can be arranged on the air outlet pipe communicated with the air outlet 11, and the detection member 50 is used for detection); wherein the area of the air outlet 11 is divided into an upper layer area and a lower layer area in the up-down direction, the upper layer flow rate is the flow rate of the gas in the upper layer area, and the lower layer flow rate is the flow rate of the gas in the lower layer area;

[0055] Adjusting the included angle between the a end of the blade 21 and the air outlet 11 based on the flow rate difference between the upper layer flow rate and the lower layer flow rate.

[0056] Specifically, the upper layer flow rate of the upper layer area and the lower layer flow rate of the lower layer area are obtained, and the included angle adjustment between the blade 21 and the air outlet 11 can be performed based on at least the flow rate difference between the upper layer flow rate and the lower layer flow rate, so as to realize uniform air outlet.

[0057] Of course, the control method of the embodiment of the present application is not limited to this, and in another embodiment, the detection member 50 can be arranged on the volute 10, and in the adjacent two blades 21, the gas flow rate of the area of the upper blade 21 is defined as the upper layer flow rate, and the gas flow rate of the area of the lower blade 21 is defined as the lower layer flow rate. Specifically, the number of blades 21 of the air outlet grille 20 can be two, three or more, the air outlet area between the uppermost blade 21 and the upper surface of the air outlet 11 is defined as the first air outlet area, the air outlet area between the adjacent blades 21 is defined as the second air outlet area to the N-1 air outlet area, and the air outlet area between the lowermost blade 21 and the lower surface of the air outlet 11 is defined as the N area. The detection member 50 can be used to obtain the flow rate of each air outlet area, and the included angle adjustment between the blade 21 and the air outlet 11 can be performed based on at least the flow rate difference between the upper layer flow rate and the lower layer flow rate, so as to realize uniform air outlet.

[0058] Exemplarily, the blade 21 is three, and there are the first air outlet area, the second air outlet area, the third air outlet area and the fourth air outlet area, the flow rates of the first air outlet area and the second air outlet area are compared, and the angle is adjusted, the flow rates of the second air outlet area and the third air outlet area are compared, and the angle is adjusted, and the flow rates of the third air outlet area and the fourth air outlet area are compared, and the angle is adjusted, so that the flow rate difference between the adjacent air outlet areas is smaller, and the uniformity of air outlet is higher.

[0059] ​The control method of the fan 100 according to the embodiment of the present application firstly increases the adjustable air outlet grille 20 at the air outlet 11, which can solve the problems of uneven air flow at the air outlet 11 of the fan 100 and small range negative pressure at the upper side of the air outlet 11, and by adjusting the flow rates of the multiple air outlet areas and controlling the blades 21 to rotate to the optimal angle, the vortex flow noise and energy loss of the air outlet 11 of the fan 100 caused by turbulent pressure pulsation can be minimized.

[0060] As shown in the figure, the angle adjustment between the air inlet side a end of the blade 21 and the air outlet 11 based on the flow rate difference between the upper layer flow rate and the lower layer flow rate specifically includes: Figure 5

[0061] If the flow rate difference is less than or equal to the first threshold value, the angle adjustment of the blade 21 is performed with the first adjustment threshold value;

[0062] If the flow rate difference is greater than the first threshold value, the angle adjustment of the blade 21 is performed with the second adjustment threshold value, wherein the first adjustment threshold value is less than the second adjustment threshold value.

[0063] That is, when the flow rate difference is large, the angle adjustment of the blade 21 is performed with a large value, and when the flow rate difference is small, the angle adjustment of the blade 21 is performed with a small value, which can ensure the response speed of the angle adjustment of the blade 21 to meet the use requirements while ensuring the angle adjustment accuracy of the blade 21, and realize fast and reliable angle adjustment.

[0064] Exemplarily, if the flow rate difference between the upper layer flow rate and the lower layer flow rate is less than or equal to 10% of the lower layer flow rate, the angle adjustment is performed with the first adjustment threshold value (such as 1-5 degrees); if the flow rate difference between the upper layer flow rate and the lower layer flow rate is greater than 10% of the lower layer flow rate, the angle adjustment is performed with the second adjustment threshold value (such as 5-10 degrees).

[0065] Further, the control method further includes adjusting the angle of the blade 21 with the second adjustment threshold value, and adjusting the angle of the blade 21 with the first adjustment threshold value after the flow rate difference is less than or equal to the first threshold value.

[0066] That is, the adjustment is performed with the second adjustment threshold value, and after the flow rate difference between the upper layer flow rate and the lower layer flow rate is less than 10% of the lower layer flow rate, the adjustment is further switched to the first adjustment threshold value to improve the angle adjustment accuracy.

[0067] The central purification system according to the third aspect of the embodiment of the present application includes the fan 100 in the above embodiment and is controlled based on the control method in the above embodiment, and has the same technical effects as the fan 100 and the control method, which will not be described here.

[0068] ​In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0069] In the description of the application, "first feature" and "second feature" can include one or more of the features.

[0070] In the description of the application, "a plurality of" means two or more.

[0071] In the description of the application, "above", "over" and "on" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them.

[0072] In the description of the application, "above", "over" and "on" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height.

[0073] In the description of the application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description of the application, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0074] Although embodiments of the application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the application, and the scope of the application is defined by the claims and their equivalents.

Claims

1. A fan, characterized by, It comprises: A volute (10) having an air outlet (11); An air outlet grille (20) having a plurality of blades (21) spaced apart in the up-down direction and rotatably arranged on the air outlet (11), the plurality of blades (21) moving synchronously; An adjusting member (30) arranged on at least one of the blades (21) and used to drive the blade (21) provided with the adjusting member to rotate relative to the volute (10); The left and right side surfaces of the volute (10) are respectively provided with through holes corresponding to the adjusting member (30), and the adjusting member (30) is arranged in the through hole, and the blade (21) located at the uppermost of the air outlet grille (20) is in contact with the volute tongue; On the air inlet side (a), the spacing between adjacent blades (21) gradually increases from top to bottom; On the air outlet side (b), the spacing between adjacent blades (21) is equal.

2. The fan of claim 1, wherein The air outlet grille (20) further comprises a connecting member (22) connected with the plurality of blades (21) to link the plurality of blades (21).

3. The fan of claim 2, wherein, The adjusting member (30) is arranged on the air inlet side (a) of the blade (21), and the connecting member (22) is arranged on the air outlet side (b) of the blade (21).

4. The fan of claim 1, wherein The blade (21) is arc-shaped in the airflow direction.

5. The fan of claim 1, wherein The fan further comprises a driving member (40) arranged on the volute (10) and used to transmit power to the adjusting member (30).

6. The fan of claim 5, wherein, The adjusting member (30) is configured as an adjusting rod, and the adjusting rod is formed as a non-circular rod.

7. A control method of a fan, characterized by, A fan for controlling the fan of any one of claims 1-6, comprising: Obtaining the upper flow rate U1 and the lower flow rate U2 of the air outlet (11) region; wherein the air outlet region is divided into an upper region and a lower region in the up-down direction, the upper flow rate is the gas flow rate in the upper region, and the lower flow rate is the gas flow rate in the lower region; Based on the flow rate difference between the upper flow rate and the lower flow rate, adjusting the included angle between the air inlet side (a) end of the blade (21) and the air outlet (11).

8. The fan control method of claim 7, wherein: Based on the flow rate difference between the upper flow rate and the lower flow rate, adjusting the included angle between the air inlet side (a) end of the blade (21) and the air outlet (11) specifically comprises: If the flow rate difference is less than or equal to a first threshold value, the angle of the blade (21) is adjusted by a first adjustment threshold value; If the flow rate difference is greater than the first threshold value, the angle of the blade (21) is adjusted by a second adjustment threshold value, wherein the first adjustment threshold value is less than the second adjustment threshold value.

9. The control method of a fan according to claim 8, characterized by, The control method further comprises adjusting the angle of the blade (21) by the second adjustment threshold value, and after the flow rate difference is less than or equal to the first threshold value, adjusting the angle of the blade (21) by the first adjustment threshold value.

10. A central purification system, characterized in that It comprises: The fan according to any one of claims 1 to 6, and controlled based on the control method according to any one of claims 7 to 9.

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