Axial fan and electrical equipment

Abstract

The utility model relates to the field of electrical equipment, in particular to an axial flow fan and electrical equipment. The axial flow fan aims at solving the problem of how to improve the air supply efficiency of the axial flow fan. In order to achieve the purpose, the axial flow fan comprises a fan blade body and an air inducing ring, the fan blade body comprises a fan blade structure and a shroud ring, the shroud ring is arranged on the fan blade structure in a sleeving mode and fixedly connected with the radial edge of the fan blade structure, the air inducing ring is arranged on the air inlet side of the fan blade body, part of the air inducing ring extends into the shroud ring, and a gap is formed between the air inducing ring and the shroud ring. According to the arrangement mode, the radial edge of the fan blade structure is fixedly connected with the shroud ring, the air inducing ring is arranged on the air inlet side of the shroud ring, the air inducing ring partially extends into the shroud ring, and the gap is formed between the air inducing ring and the shroud ring, so that the air outlet path of air flow is optimized, the complexity of a backflow path is increased, backflow resistance is increased, and the service life of the fan blade structure is prolonged. Therefore, backflow loss is reduced, and the air supply efficiency of the axial fan is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electrical equipment, concretely relates to a axial flow fan and electrical equipment. BACKGROUND

[0002] In the diversified environment of modern life and work, electrical equipment significantly improves the convenience and comfort of human life with its indispensable functionality. As a typical representative, air conditioners create a comfortable environment for users by regulating indoor temperature. During operation, the fan plays a crucial role, especially the axial flow fan, which is widely used in air conditioners due to its large air volume and simple structure, becoming a key component for rapid heat exchange between the outdoor heat exchanger and the external environment.

[0003] As shown in Figure 1 In traditional axial flow fans, to ensure that the blades do not come into contact with the collector during rotation, thereby avoiding damage to the blades and collector, there is usually a gap between the blades and the collector. However, the existence of the gap causes air backflow along the gap to the suction side during fan rotation due to the pressure difference between the fan's inlet and outlet sides, resulting in leakage and reducing the air supply efficiency of the axial flow fan.

[0004] Accordingly, there is a need for a new technical solution to solve the above problems. UTILITY MODEL CONTENT

[0005] To solve at least one of the above problems in the prior art, i.e. to solve the problem of how to improve the air supply efficiency of the axial flow fan, the present application provides an axial flow fan, comprising:

[0006] A blade body comprising a blade structure and a shroud, the shroud being sleeved on the blade structure and fixedly connected with the radial edge of the blade structure;

[0007] An air guide ring is provided on the inlet side of the blade body and partially extends into the shroud, forming a gap between the shroud.

[0008] In the preferred technical solution of the above axial flow fan, the shroud comprises a first shroud and a second shroud connected with the first shroud, the first shroud and the second shroud are sequentially arranged along the direction from the outlet side to the inlet side of the blade structure, the first shroud is fixedly connected with the radial edge of the blade structure, and the air guide ring partially extends into the second shroud and forms a gap with the second shroud.

[0009] In the preferred technical solution of the above axial flow fan, in the radial direction of the shroud, the size of the gap is D, D>6mm.

[0010] In the preferred technical solution of the axial flow fan, the air guide ring extends into the second shroud by a size L in the axial direction of the shroud, and L>3mm.

[0011] In the preferred technical solution of the axial flow fan, the first shroud is transitionally connected with the second shroud, and the inner diameter of the second shroud is greater than the inner diameter of the first shroud.

[0012] In the preferred technical solution of the axial flow fan, the fan structure comprises a hub and a plurality of fan blades, the plurality of fan blades are arranged at intervals along the circumferential direction of the hub, and the radial edge of the fan blade is fixedly connected with the inner wall of the shroud.

[0013] In the preferred technical solution of the axial flow fan, the included angle between the fan blade and the axial section of the hub gradually decreases along the radial direction of the fan blade.

[0014] In the preferred technical solution of the axial flow fan, one side or both sides of the fan blade protrude in the rotation direction.

[0015] In the preferred technical solution of the axial flow fan, the axial flow fan further comprises a housing and a driving mechanism, the driving mechanism is arranged on the housing and the output end of the driving mechanism is connected with the fan blade body; and

[0016] The air guide ring is arranged on the housing.

[0017] The present application also provides an electric appliance comprising the axial flow fan of any of the preferred technical solutions.

[0018] Those skilled in the art can understand that the axial flow fan of the present application optimizes the air outlet path of the airflow by fixedly connecting the radial edge of the fan structure with the shroud, and arranging the air guide ring on the air inlet side of the shroud, part of the air guide ring extending into the shroud and forming a gap between the shroud, not only increases the complexity of the backflow path, but also increases the backflow resistance, thereby reducing the backflow loss and improving the air supply efficiency of the axial flow fan.

[0019] Further, by fixedly connecting the first shroud with the radial edge of the fan structure, and part of the air guide ring extending into the second shroud, the complexity of the gas backflow path can be increased, the backflow resistance can be increased, thereby reducing the backflow loss and improving the air supply efficiency of the axial flow fan.

[0020] Further, by setting the inner diameter of the second shroud to be greater than the inner diameter of the second shroud, the size of the air inlet side of the axial flow fan is increased, thereby improving the air supply efficiency and air volume of the axial flow fan.

[0021] Further, by gradually reducing the angle between the fan blade and the hub axial section along the radial direction of the fan blade, the fan blade can more effectively push the air flow in the radial direction, thereby increasing the air output and improving the air supply efficiency of the axial flow fan while keeping the rotation speed unchanged.

[0022] Further, by protruding one side or both sides of the fan blade in the rotation direction, the air flow output of the fan blade at the same rotation speed can be effectively enhanced, so that the fan blade can more effectively push the air flow, increase the air output, and improve the air supply efficiency of the axial flow fan. BRIEF DESCRIPTION OF DRAWINGS

[0023] The axial flow fan of the present application will be described below with reference to the accompanying drawings. In the drawings:

[0024] Figure 1 is a partial sectional view of the prior art axial flow fan;

[0025] Figure 2 is a structural view of the axial flow fan of the present application;

[0026] Figure 3 is a sectional view of the axial flow fan of the present application;

[0027] Figure 4 is Figure 3 is an enlarged view of A in FIG. 4;

[0028] Figure 5 is a structural view of the fan blade body of the present application;

[0029] Figure 6 is a sectional view of the fan blade body of the present application;

[0030] Figure 7 is a graph of the air supply efficiency of the prior art axial flow fan and the axial flow fan of the present application.

[0031] LIST OF REFERENCE NUMBERS:

[0032] 1, fan blade body; 11, fan blade structure; 111, fan blade; 111a, first side; 111b, second side; 112, hub; 12, shroud; 121, first shroud; 122, second shroud; 2, air guide ring; 3, housing; 4, motor; 5, current collector. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art will appreciate that the embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application. For example, although the embodiments are introduced in combination with the air conditioner, this is not intended to limit the protection scope of the present application, and those skilled in the art can apply the present application to other types of electrical appliances, such as microwave ovens, etc., without departing from the principles of the present application.

[0034] It should be noted that in the description of the present application, the terms "upper", "lower", "inner", "bottom", "end" and other terms indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and is not intended to indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0035] In addition, it should also be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "provided", "connected", "communicated" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0036] In combination with Figure 1 The prior art axial flow fan is introduced.

[0037] The prior art axial flow fan includes a fan blade structure 11 and a collector 5 sleeved outside the fan blade structure 11. The collector 5 is usually fixed on the shell (not shown in the figure) of the axial flow fan. In order to ensure that the fan blades 111 in the fan blade structure 11 do not contact the collector 5 during rotation, there is usually a gap between the collector 5 and the radial edge of the fan blade structure 11, and the gap is in the range of 8-10 mm. However, the existence of the gap causes the air flow on the outlet side of the axial flow fan to flow back to the inlet side along the gap, resulting in a decrease in the air supply efficiency of the axial flow fan, thereby affecting the refrigeration or heating effect of the air conditioner. In combination with Figure 6 It can be seen that when the rotational speed is in the range of 18500-22500 r / h, the air supply efficiency of the axial flow fan is between 0.12-0.39.

[0038] First, referring to Figures 2-6 The axial flow fan of the present application is described.

[0039] In order to solve the problem of backflow in the operation of the existing axial flow fan, the axial flow fan of the present application comprises a fan blade body 1 and an air guide ring 2. The fan blade body 1 comprises a fan blade structure 11 and a surrounding band 12, and the surrounding band 12 is sleeved on the fan blade structure 11 and fixedly connected with the radial edge of the fan blade structure 11. The air guide ring 2 is arranged on the air inlet side of the fan blade body 1 and partially extends into the surrounding band 12 to form a gap between the surrounding band 12.

[0040] The present application fixes the radial edge of the fan blade structure 11 with the surrounding band 12, and arranges the air guide ring 2 on the air inlet side of the surrounding band 12, and part of the air guide ring 2 extends into the surrounding band 12 to form a gap between the surrounding band 12, which not only optimizes the air outlet path of the airflow, but also increases the complexity of the backflow path, so that the backflow resistance is increased, thereby reducing the backflow loss and improving the air supply efficiency of the axial flow fan.

[0041] Further reference will be made below Figures 2-6 to introduce a preferred embodiment of the axial flow fan of the present application. Those skilled in the art can understand that the following embodiments are only used to illustrate the principles of the present application and are not intended to limit the protection scope of the present application. Under the premise of meeting the axial flow fan comprising at least a fan blade structure 11 and an air guide ring 2, those skilled in the art can adjust the following arrangement to make the present application applicable to more specific application scenarios. In the present application, the radial direction refers to Figures 3-6 the left-right direction shown, and the axial direction refers to Figures 3-6 the up-down direction shown.

[0042] In combination with Figures 2-3 and 5-6, the axial flow fan comprises a fan blade body 1, an air guide ring 2, a housing 3 and a driving mechanism. The top and bottom of the housing 3 are both open, and the air guide ring 2 is arranged on the open top of the housing 3. The fan blade body 1 comprises a surrounding band 12 and a fan blade structure 11, and the driving mechanism is a motor 4. The motor 4 is arranged in the housing 3 through a connecting frame, and the output end of the motor 4 extends out of the open top of the housing 3 and is rotationally connected with the fan blade structure 11, so that the motor 4 can drive the fan blade structure 11 to rotate. The fan blade structure 11 is sleeved with the surrounding band 12, and the inner wall of the surrounding band 12 is fixedly connected with the radial edge of the fan blade structure 11, so that the surrounding band 12 can rotate together with the fan blade structure 11 during the rotation of the fan blade structure 11.

[0043] It should be noted that the present application is not limited to the connection mode of the surrounding band 12 and the fan blade structure 11, as long as the surrounding band 12 is fixedly connected with the radial edge of the fan blade structure 11. For example, the surrounding band 12 and the fan blade structure 11 are integrally formed, or the radial edge of the surrounding band 12 and the fan blade structure 11 are connected by an adhesive.

[0044] Next, refer to Figures 2-3And 5-6, the fan structure 11 includes a hub 112 and a plurality of fan blades 111, the plurality of fan blades 111 are arranged along the circumference of the hub 112, and the radial edge of each fan blade 111 is fixedly connected with the inner wall of the shroud 12. The included angle between the fan blade 111 and the axial section of the hub 112 gradually decreases along the radial direction of the fan blade 111. The fan blade 111 extends on both sides of its radial direction, that is, the first side 111a and the second side 111b, and both sides protrude in the counterclockwise direction (that is, the rotation direction of the fan blade 111). Through the above setting mode, the air flow output of the fan blade 111 at the same speed can be effectively enhanced, so that the fan blade 111 can more effectively push the air flow, increase the air volume, improve the air supply efficiency of the axial flow fan, and thus improve the refrigeration or heating effect of the air conditioner.

[0045] It should be noted that since each fan blade 111 is fixedly connected with the inner wall of the shroud 12, in the case that the inner wall of the shroud 12 is the same as the inner wall of the collector 5, the radial dimension of the fan blade 111 is substantially increased, so that the air volume of the axial flow fan at the same speed is larger.

[0046] Of course, the specific setting form of the fan blade 111 in the present application is not fixed, and those skilled in the art can adjust it according to the needs. For example, the included angle between the fan blade 111 and the axial section of the hub 112 is fixedly unchanged along the radial direction of the fan blade 111. And / or, the first side 111a of the fan blade 111 protrudes in the rotation direction, or the second side 111b of the fan blade 111 protrudes in the rotation direction.

[0047] In addition, the number of fan blades 111 in the present application is not fixed, and those skilled in the art can adjust it according to the specific application scene. For example, the number of fan blades 111 is 7, 8, 9, 10, 11 or other number.

[0048] Next, referring to Figures 5-6 , the shroud 12 includes a first shroud 121 and a second shroud 122, the first shroud 121 and the second shroud 122 are sequentially arranged along the direction from the air outlet side of the fan structure 11 to the air inlet side thereof. The first shroud 121 and the second shroud 122 are transitionally connected. Among them, the inner diameter of the first shroud 121 is R1, the inner diameter of the second shroud 12 is R2, R2>R1. Through the above setting mode, the size of the air inlet side of the axial flow fan is increased, thereby improving the air supply efficiency and air volume of the axial flow fan, thereby improving the refrigeration or heating effect of the air conditioner.

[0049] It should be noted that the application does not limit the transition mode of the first surrounding band 121 and the second surrounding band 122, as long as the first surrounding band 121 and the second surrounding band 122 can be transitionally connected. For example, the first surrounding band 121 and the second surrounding band 122 can be arc-shaped transitionally connected, or can be straight transitionally connected. The transition section can be integrally formed with the first surrounding band 121 and the second surrounding band 122, or can be connected through a fastener.

[0050] Next, referring to Figures 3-4 , the air guide ring 2 is trumpet-shaped, the narrow end of which extends into the area surrounded by the second surrounding band 12, and the wide end of which extends out of the second surrounding band 12 and is connected to the open end of the top of the shell 3. The inner diameter of the wide end of the air guide ring 2 is greater than the inner diameter of the wide end of the second surrounding band 12, so that the air flow can be effectively guided into the air inlet side of the fan blade structure 11, reducing the wind resistance and improving the air volume. There is a gap between the outer wall of the air guide ring 2 extending into the second surrounding band 12 and the inner wall of the second surrounding band 12. In the radial direction of the surrounding band 12, the size of the gap is D, and D>6mm. In the axial direction of the surrounding band 12, the size of the air guide ring 2 extending into the second surrounding band 12 is L, and L>3mm. Through the above setting mode, the air guide ring 2 can better guide the external air into the axial flow fan, reduce the generation of turbulence and vortex, and at the same time, can also increase the complexity of the backflow path, so that the backflow resistance increases, thereby reducing the backflow loss, improving the air supply efficiency of the axial flow fan, and further improving the refrigeration or heating effect of the air conditioner.

[0051] It should be noted that in order to ensure that the narrow end of the air guide ring 2 is arranged in the second surrounding band 12, in the axial direction of the surrounding band 12, the size of the second surrounding band 12 is greater than the size of the air guide ring 2 extending into the second surrounding band 12.

[0052] The air supply efficiency of the axial flow fan of the application is tested, and the results are shown in Figure 7 .

[0053] From Figure 7 it can be seen that the air supply efficiency of the axial flow fan provided by the application is between 0.22-0.45 when the rotating speed is in the range of 18500-22500r / h, which is significantly improved compared with the axial flow fan of the prior art, thereby helping to improve the refrigeration or heating effect of the air conditioner.

[0054] In addition, the application also provides an electric appliance, which comprises the axial flow fan of any of the above embodiments.

[0055] Those skilled in the art will appreciate that the features of the various embodiments can be combined with each other in any combination within the scope of the application and form different embodiments. For example, in the claims of the application, any of the claimed embodiments can be used in any combination.

[0056] So far, the technical solution of the present application has been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will all fall within the protection scope of the present application.

Claims

1. An axial flow fan characterised in that, The axial flow fan comprises: a fan body (1) comprising a fan structure (11) and a shroud (12) sleeved on the fan structure (11) and fixedly connected with a radial edge of the fan structure (11); an air guide ring (2) arranged on an air inlet side of the fan body (1) and partially extending into the shroud (12) to form a gap with the shroud (12).

2. The axial fan according to claim 1, characterized in that The shroud (12) comprises a first shroud (121) and a second shroud (122) connected with the first shroud (121), the first shroud (121) and the second shroud (122) are arranged in sequence along a direction from an air outlet side of the fan structure (11) to an air inlet side thereof, the first shroud (121) is fixedly connected with the radial edge of the fan structure (11), and the air guide ring (2) partially extends into the second shroud (122) to form a gap with the second shroud (122).

3. The axial fan according to claim 2, characterized in that In a radial direction of the shroud (12), a size of the gap is D, and D>6mm.

4. The axial fan according to claim 2, characterized in that In an axial direction of the shroud (12), a size of the air guide ring (2) extending into the second shroud (122) is L, and L>3mm.

5. The axial fan according to claim 2, wherein The first shroud (121) is transitionally connected with the second shroud (122), and an inner diameter of the second shroud (122) is greater than an inner diameter of the first shroud (121).

6. The axial fan according to claim 1, wherein The fan structure (11) comprises a hub (112) and a plurality of fan blades (111) arranged in a circumferential direction of the hub (112), and a radial edge of the fan blade (111) is fixedly connected with an inner wall of the shroud (12).

7. The axial fan according to claim 6, characterized in that An included angle between the fan blade (111) and an axial cross section of the hub (112) gradually decreases along a radial direction of the fan blade (111).

8. The axial fan according to claim 6, characterized in that The fan blade (111) is convex to a rotation direction on one side or both sides.

9. The axial fan according to claim 1, wherein The axial flow fan further comprises a housing (3) and a driving mechanism arranged on the housing (3) and having an output end connected with the fan body (1); and The air guide ring (2) is arranged on the housing (3).

10. An electrical appliance characterized by The electrical appliance comprises the axial flow fan according to any one of claims 1-9.

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