Fan wing structure of outdoor unit

Abstract

The utility model discloses an outdoor unit fan wing structure which comprises a hub and an impeller. The impeller is of an integrated structure and comprises a lantern ring and blades, the lantern ring is provided with a cavity for the hub to be connected in, the hub is welded and fixed to the lantern ring, the blades are obliquely arranged along the lantern ring, each blade comprises a front arc edge, a rear arc edge and an outer arc edge, the front arc edges and the outer arc edges are smooth curved edges, and the rear arc edges are bent towards the insides of the blades to form concave positions. The device has the advantages of simple structure, compact matching, reasonable design and the like; therefore, the device is a product with excellent technical and economical performance.

Description

[Technical Field]

[0001] This utility model mainly relates to an external fan wing structure. [Background Technology]

[0002] Currently, the outdoor unit of an air conditioner mainly consists of a heat exchanger, an axial fan, an air guide structure, a fan grille, a motor mounting bracket, a partition, and a compressor system. Typically, an axial fan consists of a hub connected to the motor shaft and blades arranged symmetrically around the fan's rotation axis at equal intervals. The motor drives the fan blades to rotate. Airflow near the shaft is slower and at higher pressure, while airflow near the blade edges is faster and at lower pressure, creating a pressure difference that causes air to flow from the shaft towards the blade edges. Furthermore, as air flows forward along the shape of the fan blades, air behind the fan continuously replenishes it due to the negative pressure of the airflow, thus forming a continuous propulsive airflow, or wind.

[0003] The sources of fan noise can be mainly divided into two categories: one is the fluid noise generated by the rotation of the fan blades, and the other is the electromagnetic noise generated by the operation of the motor. How to reduce noise has become the direction of our research. [Utility Model Content]

[0004] To solve at least one of the above problems, this utility model proposes a new structural solution. The outdoor unit fan wing structure adopts the following technical solution:

[0005] An external fan blade structure includes a hub and an impeller; the impeller is an integral structure, including a collar and blades, the collar has a cavity for the hub to be connected, and the hub is welded and fixed to the collar, the blades are inclined along the collar, and the blades include a front arc edge, a rear arc edge and an outer arc edge, the front arc edge and the outer arc edge are both smooth curved edges, and the rear arc edge is bent inward to form a concave position.

[0006] Preferably, the inner circumference of the wheel hub is provided with several reinforcing ribs.

[0007] Preferably, the collar has several notches.

[0008] Preferably, a perforated motor rotor connection is provided at the center of the hub.

[0009] Preferably, the junction of the outer arc edge and the rear arc edge forms an acute angle, and the junction of the outer arc edge and the rear arc edge forms an obtuse angle.

[0010] Preferably, the concave area is smooth, and the angle formed by the concave area is an acute angle.

[0011] The beneficial effects of this utility model compared with the prior art are:

[0012] This structure features a recessed area on the rear arc edge, formed by bending inwards towards the blade. The rear arc edge continues to extend along this recess. Due to the inclined blade design, the recess reduces the height difference between the front and rear arc edges, thereby lowering the wind pressure difference and reducing noise. Simultaneously, it does not affect the length of the outer arc edge, minimizing its impact on airflow. It boasts advantages such as simple structure, compact fit, and rational design; therefore, it is a product with superior technical and economic performance. [Attached Image Description]

[0013] Figure 1 A first-view schematic diagram of the external fan wing structure in a preferred embodiment of this utility model;

[0014] Figure 2 This is a second-view schematic diagram of the external fan wing structure in a preferred embodiment of the present invention.

Detailed Implementation Methods

[0015] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0016] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0017] The following description, in conjunction with the accompanying drawings, further illustrates specific embodiments of the present invention, making the technical solution and beneficial effects of the present invention clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0018] The preferred embodiment provided by this utility model is as follows: Figure 1 and Figure 2 As shown, an outdoor fan blade structure includes a hub 1 and an impeller 2, with a perforated motor rotor connected to the center of the hub 1.

[0019] The impeller 2 is a one-piece structure, including a collar 3 and blades 4. The collar 3 has a cavity for the hub 1 to be inserted, and the hub 1 is welded and fixed to the collar 3. The impeller and hub of this structure can be produced independently and combined for use according to requirements. The blades 4 are inclined along the collar 3. The blades 4 include a front arc edge 41, a rear arc edge 42, and an outer arc edge 43. The front arc edge 41 and the outer arc edge 43 are both smooth curved edges, and the rear arc edge 42 is bent inward to form a concave position 44.

[0020] The inner circumference of the hub 1 is provided with several reinforcing ribs 11 to enhance the overall strength of the hub 1. The collar 3 is provided with several notches 31 for easy connection.

[0021] The intersection of the outer arc edge 43 and the rear arc edge 42 forms an acute angle 45, and the intersection of the outer arc edge 43 and the rear arc edge 42 forms an obtuse angle 46. The concave position 44 is smooth, and the angle formed by the concave position 44 is an acute angle.

[0022] The motor drives the fan blades to rotate. The air velocity is slow and the air pressure is high near the shaft, while the air velocity is fast and the air pressure is low near the edge of the fan blades, thus creating a wind pressure difference. Air flows from the shaft to the edge of the fan blades. Secondly, as the air flows forward along the shape of the fan blades, the air behind the fan is continuously replenished due to the negative pressure of the airflow, thus forming a continuous propulsive airflow, which is wind.

[0023] The noise from a fan mainly comes from two sources: fluid noise from the rotating blades and electromagnetic noise from the motor. This solution primarily addresses the fluid noise from the rotating blades. The structure incorporates a recess 44 on the rear arc edge 42, formed by bending inwards towards the blade 4. The rear arc edge 42 continues to extend along the recess 44. Because the blade 4 is angled, the recess 44 reduces the height difference between the front arc edge 41 and the rear arc edge 42, thereby reducing the air pressure difference and noise. Simultaneously, it does not affect the length of the outer arc edge 43, minimizing its impact on airflow.

[0024] In the description of this specification, references to terms such as "an embodiment," "preferred," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. Illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] Based on the above description of the structure and principle, those skilled in the art should understand that this utility model is not limited to the specific embodiments described above. Improvements and substitutions made using techniques known in the art based on this utility model all fall within the protection scope of this utility model and should be defined by the claims.

Claims

1. An external fan blade structure, characterized in that: It includes a hub and an impeller; The impeller is an integral structure, including a collar and blades. The collar has a cavity for the hub to be connected, and the hub is welded and fixed to the collar. The blades are inclined along the collar and include a front arc edge, a rear arc edge and an outer arc edge. The front arc edge and the outer arc edge are both smooth curved edges, and the rear arc edge is bent inward to form a concave position.

2. The outdoor fan blade structure according to claim 1, characterized in that: The inner circumference of the wheel hub is provided with several reinforcing ribs.

3. The outdoor fan blade structure according to claim 1, characterized in that: The collar has several notches.

4. The outdoor fan blade structure according to claim 1, characterized in that: A perforated motor rotor is connected to the center of the hub.

5. The outdoor fan blade structure according to claim 1, characterized in that: The intersection of the outer arc edge and the back arc edge forms an acute angle, while the intersection of the outer arc edge and the back arc edge forms an obtuse angle.

6. The outdoor fan blade structure according to claim 1, characterized in that: The concave area is smooth, and the angle formed by the concave area is an acute angle.

Images