CN112576524B

CN112576524B - Cross-flow fan and air conditioner with same

Info

Publication number: CN112576524B
Application number: CN202011416558.XA
Authority: CN
Inventors: 李涛; 赵继斌
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd; Chongqing Haier Air Conditioner Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd; Chongqing Haier Air Conditioner Co Ltd
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2023-04-14
Anticipated expiration: 2040-12-04
Also published as: CN112576524A

Abstract

The invention relates to a cross flow fan and an air conditioner with the same. The cross flow fan includes: a middle cylindrical fan blade portion having a left torus and a right torus about a central axis; a left support end and a right support end; a left conical fan blade portion configured to extend from the left torus along the central axis progressively larger in diameter to the left support end; and a right tapered blade portion configured to extend from the right torus to the right support end along the central axis with increasing diameter. Under the condition that the axial length is not changed, the length of each axial oblique fan blade is greatly prolonged relative to the length of an axial straight fan blade extending in parallel along the central axis, so that the air output of the cross flow fan can be effectively increased. In addition, compared with a cylindrical cross-flow fan, the rotational inertia of the cross-flow fan is reduced due to the left conical fan blade part and the right conical fan blade part, so that the cross-flow fan is balanced in rotation, lower in noise and better in user experience.

Description

Cross-flow fan and air conditioner with same

Technical Field

The invention relates to an air conditioning system, in particular to a cross-flow fan and an air conditioner with the same.

Background

Existing air conditioners or indoor units thereof (hereinafter, simply referred to as "air conditioners") disposed in a conditioned room are generally provided with an air intake and an air outlet, and a heat exchanger and a fan disposed inside the air conditioner. When the air conditioner is operated, the heat exchanger can be used as an evaporator or a condenser to realize the functions of cooling or heating. The fan is often in the form of a cross-flow fan that draws air from the conditioned room (which is commonly referred to as "return air") or fresh air from the outside into the air conditioner through an air intake. The air is cooled or heated by passing over a heat exchanger in the air conditioner. The cooled or heated air is then sent to the room through the outlet vents. The cross flow fan is generally cylindrical, i.e. all blades are arranged on the same circumference around the central axis of the cross flow fan at intervals, such as the cross flow wind wheel disclosed in chinese utility model CN206917925U, which comprises a plurality of identical cylindrical fan units, which are then fixed together axially opposite to each other by fixing plates.

In order to solve the technical problem of reducing the noise of the traditional cylindrical cross flow fan, the chinese utility model patent CN2505623Y discloses another cross flow fan. The cross-flow fan is composed of a plurality of identical conical fan units, and adjacent conical fan units are combined together in a mode of connecting a small end to a small end or connecting a small end to a large end to form the stepped cross-flow fan. Through the stepped configuration, the cross flow fan generates more turbulent flow, and then noise is reduced through superposition and offset between sound waves. However, there is still room for improvement in increasing the air volume of such a stepped cross-flow fan.

Accordingly, there is a need in the art for a new solution to the above-mentioned problems.

Disclosure of Invention

In order to solve the above problems of increasing the air volume of the cross flow fan in the prior art, the present invention provides a cross flow fan, comprising: a middle cylindrical fan blade portion having left and right circular rings about a central axis; a left support end and a right support end; a left conical fan blade portion configured to extend from the left torus along the central axis progressively larger in diameter to the left support end; and a right conical fan blade portion configured to extend from the right torus to the right support end along the central axis with increasing diameter.

It can be understood by those skilled in the art that in the cross-flow fan of the present invention, three fan blade portions of a middle cylindrical fan blade portion, a left tapered fan blade portion and a right tapered fan blade portion are included, wherein the left tapered fan blade portion extends from the left circular ring surface of the middle cylindrical fan blade portion to the left support end along the central axis, and the right tapered fan blade portion extends from the right circular ring surface of the middle cylindrical fan blade portion to the right support end along the central axis. This means that the blades in both the left and right conical blade portions will extend obliquely in the axial direction with respect to the central axis and may therefore be referred to as "axially oblique blades" or "axially oblique teeth". Under the condition of unchanging axial length, the length of each axial oblique fan blade is greatly prolonged relative to the length of an axial straight fan blade which extends along the central axis in parallel, so that the air output of the cross flow fan can be effectively increased. In addition, compared with a cylindrical cross-flow fan, the rotational inertia of the cross-flow fan is reduced due to the left conical fan blade part and the right conical fan blade part, so that the cross-flow fan is balanced in rotation, less in noise and better in user experience.

In a preferred embodiment of the cross-flow fan, the left and right tapered blade portions are symmetrical to each other with respect to the middle cylindrical blade portion, and an axial length of each of the left and right tapered blade portions is greater than an axial length of the middle cylindrical blade portion. The left conical fan blade part and the right conical fan blade part are symmetrically arranged relative to the middle cylindrical fan blade part, so that the left and right balance of the cross-flow fan can be ensured, and the wind field in the cross-flow fan is more uniformly distributed; the axial length of each of the left conical fan blade part and the right conical fan blade part is greater than that of the middle cylindrical fan blade part, so that the air output of the cross-flow fan can be further increased.

In the above-described preferred embodiment of the cross-flow fan, the left support end and the right support end are each constituted by a disk rotatable about the central axis. The design of the disc is such that both the left and right support ends form a closed end.

In the above-described cross-flow fan, a support shaft extending outward along the central axis is formed on one of the left and right support ends, and a boss extending outward along the central axis is formed on the other of the left and right support ends. The sleeve on one support end is configured to receive the drive shaft of the drive motor to drive the cross flow fan in rotation, while the support shaft on the other support end allows the entire cross flow fan to rotate relative to a support structure, such as a support structure in an air conditioner.

In a preferred embodiment of the cross-flow fan, the sleeve includes an open end and a shaft cavity extending from the open end along the central axis into the sleeve, and a trumpet hole communicating with the shaft cavity is formed in the open end. The flared bore is outwardly enlarged along the central axis for guiding insertion of the drive shaft into the bushing.

In a preferred embodiment of the above mentioned crossflow fan, the conical disk has a rounded circumferential edge. The rounded circumferential edges can form a smooth transition between the different faces of the conical disc.

In a preferred embodiment of the cross flow fan, the middle cylindrical blade portion includes a plurality of straight blades, and the straight blades are arranged to extend between the left circular ring surface and the right circular ring surface at equal intervals around the central axis. The design of the straight fan blades can simplify the manufacturing process of the cross flow fan.

In a preferred embodiment of the cross flow fan, each of the straight blades has a trapezoidal, circular, or rectangular cross section. According to actual needs, the fan blades can adopt different cross sections.

In a preferred embodiment of the cross flow fan described above, the left and right tapered blade portions each include a plurality of oblique blades configured to be arranged evenly spaced from each other around the central axis, and each oblique blade has a trapezoidal, circular arc, or rectangular cross section.

In the above preferred technical solution of the cross flow fan, a screw locking hole is provided on a side wall of the shaft sleeve for fastening the shaft sleeve and the driving shaft inserted into the shaft sleeve together by a screw to prevent relative rotation therebetween.

In a preferred embodiment of the cross-flow fan, one or more circumferential support ribs are disposed in each of the left and right tapered blade portions, so as to increase the strength of the left and right tapered blade portions and prevent the left and right tapered blade portions from deforming.

The invention also provides an air conditioner which comprises any cross-flow fan. By adopting the cross flow fan, the air conditioner increases the total air supply amount under the condition of unchanging the axial length, and can reduce the vibration and noise of the air conditioner, thereby improving the experience of users.

Drawings

Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

FIG. 1 is a schematic perspective view of an embodiment of a crossflow fan of the present invention;

FIG. 2 is a schematic front view of an embodiment of the crossflow fan of the present invention;

FIG. 3 is an enlarged view of a portion A of the embodiment of the crossflow fan of the present invention shown in FIG. 2;

FIG. 4 is a partial enlargement B of the embodiment of the crossflow fan of the present invention shown in FIG. 2;

FIG. 5 is a schematic right-side view of an embodiment of the crossflow fan of the present invention.

List of reference numbers:

1. a cross-flow fan; 11. a middle cylindrical fan blade portion; 111. a left torus; 112. a right torus; 113. a straight fan blade; 114. a left support rib; 115. a right support rib; 12. a left support end; 121. a left disc; 122. a left circumferential edge; 123. a support shaft; 13. a right support end; 131. a right disc; 132. a right circumferential edge; 133. a shaft sleeve; 331. an open end; 332. a shaft cavity; 333. a horn hole; 334. a screw locking hole; 14. a left tapered blade portion; 141. a left oblique fan blade; 15. a right conical fan blade portion; 151. right oblique fan blade.

Detailed Description

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "top", "bottom", etc., are based on the directions or positional relationships shown in the drawings, which are for convenience of description only, and do not indicate or imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The invention provides a cross flow fan 1, aiming at solving the technical problem that the cross flow fan increases the air supply quantity. The cross flow fan 1 includes: a middle cylindrical fan blade portion 11 having left and right circular-

ring surfaces

111 and 112 around a central axis C; a left support end 12 and a right support end 13; a left conical blade section 14 configured to extend from the left torus 111 to the left support end 12 along the central axis C with increasing diameter; and a right tapered blade portion 15 configured to extend from the right annular surface 112 along the center axis C with a diameter that gradually increases to the right support end 13.

The terms "left" and "right" as referred to herein, unless expressly stated to the contrary, are relative to the orientation shown in fig. 2. Reference herein to "straight blades" is to blades extending parallel to the central axis C. The "inclined fan blade" referred to herein means a fan blade inclined in the central axis direction C of the cross flow fan.

Fig. 1 is a perspective view schematically showing an embodiment of a cross flow fan of the present invention, fig. 2 is a front view schematically showing the embodiment of the cross flow fan of the present invention, fig. 3 is an enlarged view of a portion a of the embodiment of the cross flow fan of the present invention shown in fig. 2, fig. 4 is an enlarged view of a portion B of the embodiment of the cross flow fan of the present invention shown in fig. 2, and fig. 5 is a right view schematically showing the cross flow fan of the present invention. As shown in fig. 1 and 2, the cross-flow fan 1 of the present invention includes a middle cylindrical blade portion 11, a left support end 12, a right support end 13, a left tapered blade portion 14 extending between the middle cylindrical blade portion 11 and the left support end 12, and a right tapered blade portion 15 extending between the middle cylindrical blade portion 11 and the right support end 13. The left tapered blade section 14, the middle cylindrical blade section 11, and the right tapered blade section 15 together may form a girdling type fan with large ends and small middle.

As shown in fig. 1 to 3, the middle cylindrical blade part 11 has a left support rib 114, a right support rib 115, and a plurality of straight blades 113 extending between the left support rib 114 and the right support rib 115. The left support rib 114 and the right support rib 115 are both circular ring structures centered on the central axis C of the cross flow fan 1, and are used for enhancing the strength of the fan blades. The left side of the left support rib 114 forms the left circular ring surface 111 of the center cylindrical vane part 11 and the right side of the right support rib 115 forms the right circular ring surface 112 of the center cylindrical vane part 11. In one or more embodiments, the plurality of straight blades 113 are evenly spaced circumferentially about the central axis C, and each straight blade 113 is parallel to the central axis C and has a length L2. The cross-sectional shape of each straight vane 113 perpendicular to the central axis C includes, but is not limited to, a trapezoid, a circular arc, or a rectangle. In one or more embodiments, each straight fan blade 113 may extend radially along a radius toward the central axis C. Alternatively, each straight fan blade 113 may form an angle with the radial direction in the radial direction.

As shown in FIG. 2, in one or more embodiments, the left support end 12 includes a left circular disk 121 and a support shaft 123. The left disk 121 is centered on the central axis C and extends leftward along the central axis C by a predetermined distance, such as 2cm, or other suitable distance greater than or less than 2 cm. In one or more embodiments, the left circumferential edge 122 of the left disk 121 is rounded to provide a smooth transition from the left axial face to the radial face of the left disk 121. The support shaft 123 has a center axis C as a rotation axis and extends perpendicularly outward from the left axial face of the left disc 121. As shown in fig. 2 and 4, in one or more embodiments, the right support end 13 includes a right disk 131 and a hub 133. The sleeve 133 is configured to receive a drive shaft of, for example, an electric motor. The right disk 131 is also centered on the central axis C and extends a predetermined distance, such as 2cm, or other suitable distance greater than or less than 2cm, to the right along the central axis C. As shown in fig. 2 and 4, in one or more embodiments, the right circumferential edge 132 of the right conical disk 121 is rounded to provide a smooth transition from the right axial face to the radial face of the right disk 131. The boss 133 has a center axis C as a rotation axis and extends perpendicularly outward from a right axial face of the right disc 131. As shown in fig. 4, the sleeve 133 has an open end 331 and a shaft cavity 332 extending from the open end 331 along a central axis C into the sleeve. The shaft cavity 332 is configured to receive a drive shaft of a motor.

In one or more embodiments, as shown in fig. 2 and 4, a circular screw locking hole 334 is formed in the sidewall of the bushing 133. The screw locking hole 334 communicates with the shaft cavity 332. When the drive shaft of the motor is inserted into the shaft cavity 332, the screw is inserted into the screw locking hole 334 and tightened so that the screw may abut against the drive shaft wall, thereby preventing relative rotation between the drive shaft and the sleeve. As shown in fig. 4, in one or more embodiments, a flare hole 333 is formed in the open end 331 of the sleeve 133. The flare hole 333 communicates with the shaft cavity 332 and expands outwardly along the central axis C. Such a flared bore facilitates alignment of the drive shaft with the bushing and guides insertion of the drive shaft of the motor into the shaft cavity 332.

Alternatively, a bushing is formed on the left support end 12 and a support shaft is formed on the right support end 13. The sleeve and the support shaft both have the central axis C as a rotation axis.

As shown in fig. 1 and 2, the left tapered blade section 14 extends from the left annular surface 111 of the intermediate cylindrical blade section 11 along the center axis C with a diameter that gradually increases to the left support end 12. The left tapered blade portion 14 includes a plurality of left diagonal blades 141. These left oblique blades 141 are distributed at even intervals in the circumferential direction around the center axis C. As shown in FIG. 2, in one or more embodiments, each of the left diagonal vanes 141 and one of the middle straight vanes 113 are axially aligned with each other. Each of the left inclined blades 141 forms a first acute included angle β 1 with the central axis C in the axial direction, so that the entire left tapered blade portion 14 forms a predetermined taper in the axial direction. First acute included angle β 1 may be, for example, 5 ° or 6 °, or other suitable angle. The cross-sectional shape of each left oblique blade 141 perpendicular to the central axis C includes, but is not limited to, a trapezoid, a circular arc, or a rectangle. In one or more embodiments, each left diagonal fan blade 141 may extend radially in a radial direction toward central axis C. Alternatively, each left oblique fan blade 141 may form an angle with the radial direction in the radial direction. Each left diagonal blade 141 has an actual length L1 in the axial direction, which is greater than the length L2 of the straight blade 113, for example, twice or more the length L2. In one or more embodiments, one or more circumferential support ribs (also referred to as "circumferential support ribs") may be disposed axially in the left conical blade section 14 as desired for increasing the strength of the left conical blade section 14. Under the condition that a plurality of circumferential support ribs are arranged, the distance between adjacent circumferential support ribs can be the same or different.

As shown in fig. 1 and 2, the right tapered blade section 15 extends from the right annular surface 112 of the intermediate cylindrical blade section 11 along the center axis C with a diameter that gradually increases to the right support end 13. Right tapered blade portion 15 includes a plurality of right angled blades 151. These right oblique blades 151 are distributed at even intervals in the circumferential direction around the center axis C. As shown in FIGS. 2 and 4, in one or more embodiments, each right angled blade 151 is axially aligned with one of the middle straight blades 113. Each right angled blade 151 forms a second acute included angle β 2 with the central axis C in the axial direction, so that the entire right tapered blade portion 15 forms a predetermined taper in the axial direction. In one or more embodiments, the right tapered blade section 15 is identically configured to the left tapered blade section 14 and is symmetrical to each other with respect to the middle cylindrical blade section 11, so that the second acute included angle β 2 may be, for example, 5 ° or 6 °, or other suitable angle. Alternatively, the configuration of the right tapered blade portion 15 may also be different from the configuration of the left tapered blade portion 14. The cross-sectional shape of each right angled blade 151 perpendicular to central axis C includes, but is not limited to, a trapezoid, a circular arc, or a rectangle. In one or more embodiments, each right angled blade 151 may extend radially along a radius toward central axis C. Alternatively, each right angled blade 151 may radially form an angle with the radial direction. Each right oblique blade 151 has an actual length L3 in the axial direction, which is greater than the length L2 of the straight blade 113, for example, twice or more the length L2. In one or more embodiments, one or more circumferential support ribs can be disposed axially in the right tapered blade section 15 as needed to increase the strength of the right tapered blade section 14. Under the condition that a plurality of circumferential support ribs are arranged, the distance between adjacent circumferential support ribs can be the same or different.

As shown in fig. 2, the axial length of the cross-flow fan 1 along the center axis C is L, and the total length of the middle cylindrical blade section 11, the left tapered blade section 14, and the right tapered blade section 15 is L1+ L2+ L3. It is clear that L1+ L2+ L3> L. In other words, when the axial length of the cross flow fan 1 is not changed by L, the actual length of the fan blades is significantly increased by the design of the left tapered blade part 14 and the right tapered blade part 15, and the air blowing amount of the cross flow fan can be significantly increased.

In one or more embodiments, the crossflow fan 1 may be integrally formed by an injection molding process. Alternatively, the crossflow fan 1 may be made by other suitable processes.

The air conditioner (not shown) of the present invention may include any one of the cross flow fans 1 described above. Through cross-flow fan 1, this air conditioner just can increase total air supply volume in the unchangeable condition of axial length, can also reduce the vibration and the noise of air conditioner in addition to user's experience has been improved.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, a person skilled in the art may combine technical features of different embodiments, and may make equivalent changes or substitutions for related technical features, and such changes or substitutions will fall within the scope of the present invention.

Claims

1. A crossflow fan, characterized in that it comprises:

a middle cylindrical fan blade portion having a left torus and a right torus about a central axis;

a left support end and a right support end;

a left conical fan blade portion configured to extend from the left torus to the left support end along the central axis with increasing diameters; and

a right conical fan blade portion configured to extend from the right torus to the right support end along the central axis progressively increasing in diameter.

2. The cross-flow fan of claim 1, wherein the left and right tapered blade portions are symmetrical to each other with respect to the middle cylindrical blade portion, and each of the left and right tapered blade portions has an axial length greater than that of the middle cylindrical blade portion.

3. The crossflow fan of claim 1 or 2 wherein the left and right support ends are each constituted by a disc rotatable about the central axis.

4. The crossflow fan of claim 3, wherein a support shaft extending outward along the central axis is formed on one of the left and right support ends, and a boss extending outward along the central axis is formed on the other of the left and right support ends.

5. The crossflow fan of claim 4 wherein the boss includes an open end and a shaft cavity extending inwardly of the boss along the central axis from the open end, a flare hole being formed in the open end in communication with the shaft cavity, the flare hole expanding outwardly along the central axis.

6. A crossflow fan as claimed in claim 3, wherein the disk has a rounded peripheral edge.

7. The crossflow fan of claim 1 or 2 wherein the intermediate cylindrical blade portion comprises a plurality of straight blades arranged to extend between the left and right circular rings at even intervals from one another about the central axis.

8. The crossflow fan of claim 7 wherein each of the straight blades has a trapezoidal, circular arc, or rectangular cross section.

9. The crossflow fan of claim 1 or 2, wherein the left and right tapered blade portions each comprise a plurality of oblique blades configured to be arranged evenly spaced from each other about the central axis and each oblique blade has a trapezoidal, circular arc, or rectangular cross section.

10. An air conditioner characterized in that it comprises a cross flow fan according to any one of claims 1 to 9.