Cross-flow fan

Abstract

The utility model relates to a cross-flow fan which comprises a volute, a fan body and a fan cover. An air outlet is formed in one side of the volute. The flow guide plate is arranged on the inner side of the air outlet and divides the air outlet into an upper air outlet and a lower air outlet; the fan impeller is arranged above the other side of the guide plate relative to the air outlet and is used for generating high-speed air flow and transmitting the high-speed air flow to the air outlet through an air duct; and the upper surface of the flow guide plate and the volute form an upper air duct, and the upper air duct is used for guiding the high-speed air flow and vertically blowing the high-speed air flow out of the upper air outlet.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to a cross-flow fan. Background Technology

[0002] The flow field motion of a cross-flow fan is complex and variable. There is a certain gap between the volute and the impeller of the cross-flow fan. If the gap is too large, air backflow is likely to occur at the air outlet. The backflow reduces the air volume of the fan at the same speed, resulting in a decrease in the overall air supply efficiency of the cross-flow fan. In addition, the backflow gas will interfere with the fan's output air and generate noise. If the backflow air volume is too large, there is a risk of abnormal surge. If the gap is too small, it will increase the system resistance, and some energy will be converted into noise energy, that is, increase the fan noise. Utility Model Content

[0003] To reduce backflow and noise, this application proposes a cross-flow fan equipped with a guide vane.

[0004] The cross-flow fan proposed in this application includes: a volute, with an air outlet on one side; a guide plate disposed inside the air outlet, dividing the air outlet into an upper air outlet and a lower air outlet; and a fan impeller disposed above the guide plate on the other side relative to the air outlet, for generating high-speed airflow and transmitting the high-speed airflow to the air outlet via a duct; wherein, the upper surface of the guide plate and the volute form an upper air duct, for guiding the high-speed airflow and blowing it vertically out from the upper air outlet.

[0005] Optionally, the guide plate is an elliptical cylinder with an elliptical cross-section, the minor axis of which is 10 mm to 20 mm and the major axis is 30 mm to 70 mm.

[0006] Optionally, the minor axis of the ellipse is 12 mm and the major axis is 50 mm.

[0007] Optionally, the long axis of the guide plate is disposed at the air outlet at an angle to the horizontal plane, the angle being 20 degrees to 50 degrees.

[0008] Optionally, the included angle is 30 degrees.

[0009] Optionally, the guide vane is L-shaped, including a front guide section and a rear guide section, the included angle between the front guide section and the rear guide section is an obtuse angle, the front guide section faces the fan impeller, and the rear guide section faces the air outlet.

[0010] Optionally, the front guide portion and the rear guide portion have the same shape.

[0011] Optionally, the thickness of the front guide portion and the rear guide portion at their maximum thickness is 10 mm to 20 mm, the angle between the central axis of the front guide portion and the horizontal plane is 35 degrees to 55 degrees, and the angle between the central axis of the rear guide portion and the horizontal plane is -5 degrees to 15 degrees.

[0012] Optionally, the thickness of the front guide section and the rear guide section at their maximum thickness is 12 mm, the angle between the central axis of the front guide section and the horizontal plane is 45 degrees, and the angle between the central axis of the rear guide section and the horizontal plane is 5 degrees.

[0013] By installing a deflector plate at the outlet of the cross-flow fan to guide the high-speed airflow, the backflow at the top of the outlet is greatly reduced, thereby increasing the air volume and reducing noise. Attached Figure Description

[0014] Figure 1 A vector diagram of the airflow of a cross-flow fan without a deflector.

[0015] Figure 2 A schematic diagram of the structure of a cross-flow fan according to an embodiment of this application.

[0016] Figure 3 A schematic diagram of the structure of the guide plate of the cross-flow fan according to an embodiment of this application.

[0017] Figure 4 A schematic diagram of the position of the guide plate of the cross-flow fan according to an embodiment of this application.

[0018] Figure 5 A vector diagram of the airflow of a cross-flow fan according to an embodiment of this application.

[0019] Figure 6 A schematic diagram of the structure of the guide plate of the cross-flow fan according to an embodiment of this application.

[0020] Figure 7 A schematic diagram of the position of the guide plate of the cross-flow fan according to an embodiment of this application.

[0021] Figure 8 A vector diagram of the airflow of a cross-flow fan according to an embodiment of this application. Detailed Implementation

[0022] Figure 1 This is a vector diagram of the airflow in an existing cross-flow fan, where the arrows indicate the direction of airflow, and the arrow density reflects the air volume. It can be seen that there is a backflow area (the area enclosed by the dashed circle) above the air outlet of the cross-flow fan. This backflow area significantly reduces the airflow above the outlet, thus reducing the overall airflow of the cross-flow fan. Furthermore, the backflow interferes with the outward-blown airflow, generating noise.

[0023] To reduce backflow, this application proposes a cross-flow fan with a guide vane at the air outlet. The cross-flow fan proposed in this application will now be described with reference to the accompanying drawings.

[0024] like Figure 2 As shown, the cross-flow fan 100 includes: a volute 1, a guide plate 2, and a fan impeller 3. The volute 1 has an air outlet 4 on one side; the guide plate 2 is located inside the air outlet 4, dividing it into an upper air outlet 5 and a lower air outlet 6; the fan impeller 3 is positioned above and on the other side of the guide plate 2, relative to the air outlet 4. Figure 1 As shown, the air outlet 4 is located on the left side of the guide plate 2, and the fan impeller 3 is located on the other side above the guide plate 2, that is, on the upper right side of the guide plate 2. It can be understood that... Figure 1 Only the cross-flow fan structure related to reducing backflow in this application is shown, and it does not mean that the cross-flow fan includes only the above-described structure. Figure 1 As shown, since the fan impeller 3 is located at the upper right of the air outlet 4, the high-speed airflow blown out by the fan impeller 3 is directed from the fan impeller 3 to the lower left. To prevent the high-speed airflow at the upper air outlet 5 from being squeezed by backflow, a guide plate 2 is provided, forming an upper airflow channel between the upper surface of the guide plate 2 and the volute. This guides the high-speed airflow that would be squeezed by backflow to the upper air outlet 5. Due to the obstruction of the upper surface, the high-speed airflow guided to the upper air outlet 5 is not squeezed to the lower side, and the high-speed airflow is blown out of the upper air outlet 5 almost vertically. As a result, the airflow at the upper air outlet 5 is increased, and the backflow at this location is reduced. Understandably, although the deflector 2 directs the high-speed airflow to the upper air outlet 5, it does not affect the high-speed airflow that would otherwise flow to the lower air outlet 6. Therefore, it does not reduce the airflow volume of the lower air outlet 6 by much, which greatly improves the overall airflow volume of the cross-flow fan.

[0025] Next reference Figures 2-8 This section will provide a detailed explanation of the structure of the baffle plate and its installation position in the cross-flow fan.

[0026] First, combine Figure 2 The cross-flow fan shown is equipped with a baffle plate and is referenced. Figure 3 , Figure 4 The diagram showing the structure and installation location of the deflector is provided for illustration. For example... Figure 3 and Figure 4In the first embodiment shown, the guide plate is an elliptical cylinder with an elliptical cross-section as shown in the figure. The minor axis of this ellipse ranges from 10 mm to 20 mm, and the major axis ranges from 30 mm to 70 mm. The major axis of the guide plate is positioned at the air outlet at an angle to the horizontal plane, ranging from 20 degrees to 50 degrees, to ensure it is as parallel as possible to the high-speed airflow from the fan impeller, thus facilitating better airflow guidance. Preferably, the minor axis is 12 mm long, the major axis is 50 mm long, and the angle is 30 degrees. Figure 4 As shown. It's understandable that, to ensure the airflow from the upper and lower air outlets is as uniform as possible, the deflector is typically positioned in the center of the outlet, meaning the midpoint of the short and long axes is located at the midpoint of the outlet's longitudinal direction. For example, if the outlet height is 110 mm, the deflector would be positioned at 55 mm. Figure 4 As shown. Figure 5 As shown in the airflow vector diagram of the cross-flow fan, after the guide plate is installed, there is no backflow at the upper air outlet, and the air volume at the upper air outlet is greatly increased.

[0027] Figures 6-8 This application proposes a cross-flow fan with an alternative guide vane. For example... Figure 6 The three-dimensional structural diagram of the guide vane is shown. The guide vane is L-shaped and consists of two identical parts, a front guide section 1 and a rear guide section 2, with the dashed line S as the axis of symmetry. It can be seen that the angle formed by the front and rear guide sections is an obtuse angle. This is determined by the position and structural relationship between the impeller and the outlet of the cross-flow fan. On one hand, the obtuse angle structure allows the high-speed airflow blown out by the impeller through the front guide section, and the high-speed airflow blown to the outside of the outlet through the rear guide section to be blown almost directly to the ground, thereby increasing the flow velocity. On the other hand, the obtuse angle structure... Figure 6 The front guide portion of the deflector shown is relative to Figure 4 The upper end of the baffle plate is curved upwards, which increases the air intake area of ​​the lower air outlet to a certain extent, and can also increase the air volume. Furthermore, the maximum thickness of the front and rear baffle sections is 10 mm to 20 mm, the angle between the central axis of the front baffle section and the horizontal plane is 35 degrees to 55 degrees, and the angle between the central axis of the rear baffle section and the horizontal plane is -5 degrees to 15 degrees. Preferably, the maximum thickness of the front and rear baffle sections is 12 mm (i.e., 2*6 mm), the angle between the central axis of the front baffle section and the horizontal plane is 45 degrees, and the angle between the central axis of the rear baffle section and the horizontal plane is 5 degrees. Figure 7 As shown. Figure 8 The diagram shows the airflow of a cross-flow fan equipped with the baffle plate. It can be seen that there is no backflow in the cross-flow fan equipped with the baffle plate, and the airflow on the surface of the air outlet is mostly blown out vertically, which increases both air volume and air velocity.

[0028] In one implementation method Figure 6 The shape of the guide vane shown can be derived from... Figure 3 The guide vane shown is obtained by cutting, splicing, and smoothing the elliptical cylinder. For example, using... Figure 3 The deflector shown is divided in two along the minor axis of an ellipse, and rotated around the midpoint (the intersection of the minor and major axes) to fix the two separated parts at a certain obtuse angle. Next, excess overlap is removed, and the break caused by rotation is smoothly connected. An arc is preferably used for the connection, for example... Figure 7 As shown, the connecting arc radius on the upper surface is 20 mm, and the connecting arc radius on the lower surface is 5 mm. It should be understood that the above process is only for illustrative purposes. Figure 6 The diagram shown is an example of the design process for the baffle plate and does not represent the actual production process.

[0029] The above describes the cross-flow fan with a guide vane proposed in this application. The guide vane structure greatly reduces the backflow at the top of the air outlet, thereby increasing the air volume at the air outlet, improving the overall air supply efficiency, and eliminating the noise caused by backflow in the cross-flow fan.

[0030] The above description illustrates the implementation of this application through specific embodiments. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0031] Furthermore, the various operations will be described as multiple discrete operations in a manner most conducive to understanding the illustrative embodiments; however, the order of description should not be construed as implying that these operations must depend on the order. In particular, these operations do not need to be performed in the order presented.

[0032] Unless the context otherwise specifies, the terms “contains,” “has,” and “includes” are synonyms. The phrase “A / B” means “A or B.” The phrase “A and / or B” means “(A and B) or (A or B).”

[0033] As used herein, the terms “module” or “unit” may refer to, be, or include: application-specific integrated circuits (ASICs), electronic circuits, (shared, dedicated, or group) processors and / or memories that execute one or more software or firmware programs, combinational logic circuits, and / or other suitable components that provide the described functionality.

[0034] In the accompanying drawings, certain structural or methodological features are shown in a specific arrangement and / or order. However, it should be understood that such a specific arrangement and / or order may not be necessary. In some embodiments, these features may be arranged in a manner and / or order different from that shown in the illustrative drawings. Furthermore, the inclusion of structural or methodological features in a particular figure does not imply that such features are required in all embodiments, and in some embodiments, these features may be omitted or may be combined with other features.

[0035] It should be understood that although terms such as "first," "second," etc., may be used herein to describe various units or data, these units or data should not be limited by these terms. These terms are used merely to distinguish one feature from another. For example, without departing from the scope of the exemplary embodiments, a first feature may be referred to as a second feature, and similarly, a second feature may be referred to as a first feature.

[0036] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0037] Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, those skilled in the art should understand that various changes in form and detail may be made thereto without departing from the spirit and scope of the present invention.

Claims

1. A cross-flow fan characterized by, The utility model relates to a kind of air supply device, including: A volute, one side of the volute is provided with air outlet; A guide plate is arranged inside the air outlet, which divides the air outlet into upper air outlet and lower air outlet; A fan impeller is arranged above the other side of the guide plate relative to the air outlet, for generating high-speed airflow, and transmitting the high-speed airflow to the air outlet via air duct;Wherein, The upper surface of the guide plate forms an upper air duct with the volute, for guiding the high-speed airflow and blowing vertically from the upper air outlet.

2. The cross-flow fan according to claim 1, characterized by The guide plate is an elliptic cylinder, the cross section is oval, the minor axis of the oval is 10mm-20mm, and the major axis is 30mm-70mm.

3. The cross-flow fan according to claim 2, characterized in that, The minor axis of the oval is 12mm, and the major axis is 50mm.

4. The cross-flow fan according to claim 3, characterized in that, The major axis of the guide plate is arranged in the air outlet at an angle with the horizontal plane, and the angle is 20 degrees-50 degrees.

5. The cross-flow fan according to claim 4, characterized in that, The angle is 30 degrees.

6. The cross-flow fan of claim 1, wherein The guide plate is L-shaped, including front guide part and rear guide part, the angle between the front guide part and the rear guide part is obtuse, the front guide part faces the fan impeller, and the rear guide part faces the air outlet.

7. The cross-flow fan according to claim 6, characterized in that The front guide part and the rear guide part are the same shape.

8. The cross-flow fan of claim 7, wherein, The thickness of the maximum thickness of the front guide part and the rear guide part is 10mm-20mm, the angle between the central axis of the front guide part and the horizontal plane is 35 degrees-55 degrees, and the angle between the central axis of the rear guide part and the horizontal plane is-5 degrees-15 degrees.

9. The cross-flow fan of claim 8, wherein, The thickness of the maximum thickness of the front guide part and the rear guide part is 12mm, the angle between the central axis of the front guide part and the horizontal plane is 45 degrees, and the angle between the central axis of the rear guide part and the horizontal plane is 5 degrees.

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