Axial flow fan and axial flow fan

Abstract

The application discloses an axial flow fan wheel and an axial flow fan, which comprise a impeller and a plurality of fan blades. The plurality of fan blades are arranged along the central axis of the impeller in a circumferential interval array. The fan blades are provided with a windward part close to the air inlet end side and an air outlet part close to the air outlet end side. In the rotation direction of the impeller, the windward part is inclined forward and upward, and the air outlet part is inclined backward. The windward part inclined forward and upward can increase the windward area of the fan blade, so that more air can be caught into the adjacent back surface. The air outlet part inclined backward can better apply pressure to the air, which is beneficial to the flow of the air.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind wheel, in particular to an axial flow fan wheel and an axial flow fan. BACKGROUND

[0002] The axial flow fan is a kind of fan with the same direction of the shaft and the airflow (i.e. the flow direction of the wind is parallel to the shaft), such as an electric fan and an air conditioner outdoor unit fan. The axial flow fan, also known as a local ventilation fan, is a kind of fan commonly used in industrial and mining enterprises. Unlike general fans, the motor and the fan blade of the axial flow fan are in a cylinder, and the shape is a cylinder. It is used for local ventilation, easy to install, and has obvious ventilation and air exchange effect, safety, and can connect the wind pipe to send the wind to the specified area. The axial flow fan is widely used, but in the actual use process, the following problems exist:

[0003] The existing axial flow fan and the pipeline positive pressure fan on the market use full forward inclined axial flow fan blades or full backward inclined axial flow fan blades. Both types of fan blades need to achieve high pressure and large flow by high speed. However, high speed will have the following adverse effects:

[0004] ① High noise: as the speed of the fan blade and the motor increases, the noise generated by the fan blade cutting the air also increases, the airflow sound in the channel increases, and the electromagnetic sound of the motor also increases. Various noises are concentrated and amplified in the pipeline, causing great noise pollution to the use environment.

[0005] ② High energy consumption: in order to increase the speed of the motor, the manufacturer has to increase the energy consumption of the machine or increase the manufacturing cost, which indirectly increases the use cost of the user;

[0006] ③ Shorten the service life of the equipment; because the speed of the motor increases, the motor reaches the fatigue limit faster, high speed and high energy consumption also increase the heat generation of the motor, which means that the motor lubricating oil will vaporize faster, so that the motor will lose the protection of the lubricating oil and stop rotating, burn the coil and produce abnormal noise. High speed also increases the mechanical vibration of the whole equipment, which makes the structure more prone to looseness, thereby reducing the service life of the equipment. SUMMARY

[0007] The present application aims to provide an axial flow fan wheel and an axial flow fan to solve one or more technical problems in the prior art and at least provide a beneficial choice or create conditions.

[0008] To solve the above technical problems, the technical scheme adopted is:

[0009] The application provides an axial flow fan wheel, which comprises a impeller and a plurality of fan blades, the plurality of fan blades are arranged along the central axis of the impeller in an axial and circumferential interval array, the fan blade is provided with a windward part close to the air inlet end side and an air outlet part close to the air outlet end side; in the rotation direction of the impeller, the windward part is inclined forward and upward, and the air outlet part is inclined backward.

[0010] The application has the following beneficial effects:

[0011] The windward part inclined forward and upward can increase the windward area of the fan blade, so that more air can be captured into the adjacent back surface, and the air outlet part arranged in the backward direction can better apply pressure to the air, which is beneficial to the flow of the air flow.

[0012] As a further improvement of the above technical solution, the edge of the windward part is arc-shaped. The arc-shaped edge can more effectively reduce the turbulence at the front end of the fan blade, so that the air flow entering the fan blade is more stable and smooth, effectively reducing the noise caused by turbulence and vibration caused by turbulence.

[0013] As a further improvement of the above technical solution, the impeller is semispherical. The air flow flows along the semispherical surface, and the semispherical impeller plays a guiding role.

[0014] As a further improvement of the above technical solution, the semispherical surface end of the impeller close to the air inlet end side is a flow guide part, and the air flow spirally flows downward under the action of the fan blade along the semispherical surface of the impeller.

[0015] As a further improvement of the above technical solution, the inner concave surface of the impeller is provided with reinforcing ribs to increase the structural strength.

[0016] As a further improvement of the above technical solution, the central axis of the impeller is provided with a mounting shaft, the number of reinforcing ribs is provided with a plurality of reinforcing ribs, and the plurality of reinforcing ribs are annularly and intervally connected between the mounting shaft and the inner concave surface of the impeller, so that the axial force is uniformly borne, and the structural strength is improved.

[0017] As a further improvement of the above technical solution, the reinforcing ribs are arranged along the central axis of the impeller, so that the structural strength is improved.

[0018] As a further improvement of the above technical solution, the root of the fan blade is arranged in a spiral along the central axis of the impeller. This is beneficial to form a spiral channel and facilitate the spiral outflow of the gas.

[0019] As a further improvement of the above technical solution, the number of fan blades is ten. Test data shows that when the number of fan blades is ten, the air volume is larger.

[0020] The application further provides an axial flow fan comprising the axial flow fan wheel. BRIEF DESCRIPTION OF DRAWINGS

[0021] The application will be further described below in conjunction with the drawings and examples.

[0022] Fig. 1 is a structural schematic diagram of an embodiment of an axial flow fan wheel provided by the application, wherein the two arrows respectively represent upward and downward directions;

[0023] Fig. 2 is an upper view of an embodiment of an axial flow fan wheel provided by the application;

[0024] Fig. 3 is a lower view of an embodiment of an axial flow fan wheel provided by the application;

[0025] Fig. 4 is a side view of an embodiment of an axial flow fan wheel provided by the application.

[0026] Reference Signs:

[0027] Impeller 100, flow guide part 110, reinforcing rib 120, mounting shaft 130, fan blade 200, windward part 210, air outlet part 220. DETAILED DESCRIPTION

[0028] This part will describe the specific embodiments of the application in detail, the preferred embodiments of the application are shown in the drawings, the role of the drawings is to supplement the description of the text part with figures, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the application, but it cannot be understood as a limitation on the protection scope of the application.

[0029] In the description of the application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does 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 on the application.

[0030] In the description of the application, if there is a word such as "several" or the like, the meaning is one or more, the meaning of more than two is more than two, greater than, less than, more than, etc. are not included in the number, above, below, within, etc. are understood to include the number.

[0031] In the description of the present application, unless otherwise explicitly defined, the words such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0032] With reference to Figs. 1 to 4 , the axial flow fan wheel and the axial flow fan of the present application are as follows:

[0033] In some embodiments, an axial flow fan wheel includes an impeller 100 and a plurality of fan blades 200 arranged in an axial circumferential interval along the central axis of the impeller 100. In this embodiment, the central axis of the impeller 100 extends axially upward and downward, and the overall air flow direction is from top to bottom. The fan blade 200 is provided with a windward part 210 close to the air inlet end side and an air outlet part 220 close to the air outlet end side. The windward part 210 has a windward surface, and the air outlet part 220 has an air outlet surface. The windward surface and the air outlet surface are respectively the upper part and the lower part of the bottom surface of the fan blade 200. In this embodiment, the fan blade rotates counterclockwise, the windward part 210 is inclined forward and upward, the air outlet part 220 is inclined backward, and the fan blade 200 has a curved surface structure.

[0034] The fan blade 200 of this embodiment does not use the conventional fan blade structure arranged in a full forward inclination and a full backward inclination, but simultaneously in a forward inclination and a backward inclination. Under the action of the fan blade 200, the airflow is arranged in a spiral along the outer peripheral wall of the impeller 100. The windward part 210 inclined forward and upward can increase the windward area of the fan blade 200, so that more air can enter the adjacent back surface. The air outlet part 220 arranged in a backward inclination can better apply pressure to the air, which is conducive to the flow of the airflow. The windward area of the windward part 210 is greater than the area of the air outlet part 220, which is more conducive to air outlet.

[0035] Further, the impeller 100 is in a semispherical shape. The airflow flows along the semispherical surface, and the semispherical impeller 100 plays a role in guiding the airflow. The semispherical surface end of the impeller 100 close to the air inlet end side is a flow guiding part 110. The airflow spirally flows downward under the action of the fan blade 200 along the semispherical surface of the impeller 100, that is, a spiral airflow channel is formed between the adjacent two fan blades 200 and the semispherical surface of the impeller 100, and the airflow spirally flows out. In other embodiments, the impeller 100 can also be in a conical shape.

[0036] From the overall macroscopic point of view, the axial flow fan wheel is designed in a funnel shape with the top being larger and the bottom being smaller. The larger air inlet area at the top is to capture more air into the fan blade 200. The air outlet area at the bottom is smaller than the air inlet area, which has a volume compression effect on the air, so as to obtain a higher pressure airflow, which is conducive to air outlet.

[0037] Further, the edge of the windward part 210 is arc-shaped. The arc-shaped edge can more effectively reduce the turbulence at the front end of the fan blade, so that the airflow entering the fan blade is more stable and smooth, effectively reducing the sound and wind noise caused by turbulence, and also reducing the vibration caused by turbulence.

[0038] Further, the inner concave surface of the impeller 100 is provided with reinforcing ribs 120 to increase the structural strength. A mounting shaft 130 is arranged on the central axis of the impeller 100, and a plurality of reinforcing ribs 120 are arranged in a ring shape and connected between the mounting shaft 130 and the inner concave surface of the impeller 100, uniformly bearing axial force and improving the structural strength. In addition, the reinforcing ribs 120 extend along the central axis of the impeller 100, improving the structural strength.

[0039] Further, the roots of the fan blades 200 are arranged in a spiral along the central axis of the impeller 100. This facilitates the formation of a spiral channel and facilitates the spiral outflow of the gas.

[0040] Further, the number of fan blades 200 is ten. Test data shows that when the number of fan blades 200 is ten, the air volume is larger. It can be known that the number of fan blades 200 can also be other numbers, such as eight or nine.

[0041] The following data are all comparison data of six-inch duct fans, and the control fan blade 200 is a variable. It can be seen from the data that when the number of fan blades 200 is ten, the air volume is larger, and the axial flow impeller of the present application is superior to the ordinary impeller.

[0042]

[0043]

[0044] The present application also provides an axial flow fan comprising the axial flow impeller of any one of the above. The axial flow fan is installed with the axial flow impeller, the air outlet effect of the axial flow impeller is good, the axial flow impeller needs a relatively small motor speed to achieve the same air volume, and the noise of the axial flow impeller is small, the motor speed is relatively small, the energy consumption is low, and the cost is also correspondingly reduced. In addition, the service life of the motor is also improved, and the service life of the axial flow fan is also improved. Therefore, the axial flow fan of the present embodiment has the advantages of low noise, long service life and low cost.

[0045] The preferred embodiments of the present application are described in detail above, but the present application is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application. These equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. An axial flow impeller, characterized in that, include: Impeller (100); Multiple fan blades (200) are arranged circumferentially along the central axis of the impeller (100). Each fan blade (200) has a windward section (210) near the air inlet and a wind outlet section (220) near the air outlet. In the rotation direction of the impeller (100), the windward section (210) is tilted forward and upward, and the wind outlet section (220) is tilted backward. The edge of the windward section (210) is arc-shaped. The impeller (100) is hemispherical. The concave surface of the impeller (100) is provided with reinforcing ribs (120). The root of each fan blade (200) is spirally arranged along the central axis of the impeller (100). The forward-tilted and upward part of the windward section (210) is higher than the top of the spherical surface of the impeller (100). The number of fan blades (200) is ten.

2. An axial flow impeller according to claim 1, characterized in that: The hemispherical end of the impeller (100) near the air inlet is the guide section (110).

3. An axial flow impeller according to claim 1, characterized in that: An mounting shaft (130) is provided on the central axis of the impeller (100), and a plurality of reinforcing ribs (120) are provided, which are connected in a ring-shaped interval between the mounting shaft (130) and the concave surface of the impeller (100).

4. An axial flow impeller according to claim 3, characterized in that: The reinforcing rib (120) extends along the central axis of the impeller (100).

5. An axial flow fan, characterized in that, Includes the axial flow wind turbine as described in any one of claims 1 to 4.

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