CN218934770U

CN218934770U - Centrifugal axial flow fan

Info

Publication number: CN218934770U
Application number: CN202222202203.1U
Authority: CN
Inventors: 龚玉祥; 宋昕; 张旭; 张凯; 张辉; 郭荣荣
Original assignee: Hangzhou Beifeng Electromechanical Co ltd; Hangzhou Beifeng Technology Co ltd
Current assignee: Hangzhou Beifeng Electromechanical Co ltd; Hangzhou Beifeng Technology Co ltd
Priority date: 2022-08-22
Filing date: 2022-08-22
Publication date: 2023-04-28
Anticipated expiration: 2032-08-22

Abstract

The utility model discloses a centrifugal axial flow fan, which comprises a shell, and a motor and a centrifugal impeller which are arranged in the shell; the centrifugal impeller is fixed on an output shaft of the motor; an air inlet is formed in one axial end of the shell, and an air outlet is formed in the other axial end of the shell; the centrifugal impeller is arranged close to the air inlet of the shell, an air flow passage is arranged in the centrifugal impeller, the inlet direction of the air flow passage is opposite to the air inlet of the shell, and the outlet of the air flow passage is annular and faces the air outlet of the shell. The utility model changes the air outlet direction of the centrifugal impeller outlet from radial to axial, and can well avoid the collision between the air flow thrown out from the centrifugal impeller and the inner wall of the shell, thereby reducing energy consumption and directly realizing the axial air outlet function of the centrifugal impeller.

Description

Centrifugal axial flow fan

Technical Field

The present utility model relates to a centrifugal axial flow fan.

Background

The fan is used as a gas conveying machine and is widely applied to industries such as building ventilation, electronic components, aviation equipment, engineering machinery, petrochemical industry, air conditioning refrigeration and the like. The centrifugal fan and the axial flow fan are the two most widely used, the centrifugal fan enables air to enter from the axial direction of the centrifugal impeller, the air enters the volute chamber along the tangential direction of rotation of the centrifugal fan under the action of centrifugal force, and the air is discharged from the volute after passing through the volute chamber. The airflow flowing direction of the axial flow fan is the same as the axial direction of the fan blade, and the axial flow fan is suitable for occasions with high flow and low pressure, and has the advantages of low general efficiency, low noise and compact space structure.

However, in some application occasions requiring large flow and large pressure rise, both the centrifugal fan and the axial flow fan cannot meet the requirements, so that the centrifugal axial flow fan is creatively designed, and the high pressure of the centrifugal fan and the large flow characteristic of the axial flow fan are both achieved. The centrifugal variable axial flow air outlet can be realized by the technical schemes disclosed in the prior patent documents such as CN104100548A, CN212774868U and CN109798258A, but the centrifugal variable axial flow air outlet is realized by arranging guide vanes to guide air flow into the axial air outlet, the centrifugal axial flow fans all use the traditional centrifugal impellers, and the air flow can collide with the wall surface of a fan shell after being thrown out from the impellers in the radial direction, so that certain energy consumption is caused, as shown in figure 1. In addition, the centrifugal axial flow fans are required to be subjected to guide vane design, the performance of the centrifugal axial flow fans is directly determined by the form of the guide vanes, and the processing and manufacturing difficulties of the guide vane parts are high, so that the centrifugal axial flow fans with good performance are high in difficulty.

Disclosure of Invention

The utility model aims to provide a centrifugal axial flow fan with low energy consumption.

The technical scheme for realizing the aim of the utility model is as follows: a centrifugal axial flow fan comprises a shell, a motor and a centrifugal impeller, wherein the motor and the centrifugal impeller are arranged in the shell; the centrifugal impeller is fixed on an output shaft of the motor; an air inlet is formed in one axial end of the shell, and an air outlet is formed in the other axial end of the shell; the centrifugal impeller is arranged close to the air inlet of the shell, an air flow passage is arranged in the centrifugal impeller, the inlet direction of the air flow passage is opposite to the air inlet of the shell, and the outlet of the air flow passage is annular and faces the air outlet of the shell.

Further, the air flow channel in the centrifugal impeller sequentially comprises an axial air inlet section, a radial air guide section and an axial air outlet section from an inlet to an outlet; the radial wind guide section is provided with a plurality of radial wind guide sections.

Further, the radial air guide section and the axial air inlet section of the air flow channel in the centrifugal impeller are in arc transition, and the radial air guide section and the axial air outlet section are in arc transition.

Further, a plurality of radial air guide sections of the air flow channel in the centrifugal impeller are arranged in a spiral divergent mode.

Further, the edge of the centrifugal impeller is curved in a direction away from the air flow channel inlet.

Further, the shell comprises a fan upper shell and a motor support shell; one axial end of the motor supporting shell is open, and the other axial end of the motor supporting shell is provided with the air outlet; the fan upper shell is fixed at the open end of the motor support shell, and the air inlet is arranged on the fan upper shell.

Further, the motor support shell comprises an outer support shell, an inner support shell and a connecting rod; the outer wall of the inner supporting shell is connected with the inner wall of the outer supporting shell through a plurality of connecting rods, and the air outlet is formed between the outer supporting shell and the inner supporting shell; the motor is fixed in the inner supporting shell; the fan upper shell is fixedly connected with one end of the outer supporting shell.

Further, the outer support shell is provided with an interface hole; the control line of the motor passes through the interface hole.

Further, one end of the outer support shell, which is close to the air outlet, is provided with a mounting plate; and the mounting plate is provided with a mounting hole.

By adopting the technical scheme, the utility model has the following beneficial effects: (1) The utility model changes the air outlet direction of the centrifugal impeller outlet from radial to axial, and can well avoid the collision between the air flow thrown out from the centrifugal impeller and the inner wall of the shell, thereby reducing energy consumption and directly realizing the axial air outlet function of the centrifugal impeller.

(2) The radial air guide section and the axial air inlet section and the radial air guide section and the axial air outlet section of the air flow channel in the centrifugal impeller are in circular arc transition, so that the impact of air flow on the inner wall of the air flow channel can be reduced, and the energy consumption and the noise are reduced.

(3) The edge of the centrifugal impeller is bent towards the direction back to the air flow channel inlet, so that the edge of the centrifugal impeller can extend to the side surface of the motor, and the air guiding effect is better.

(4) The outer wall of the inner supporting shell of the motor supporting shell is connected with the inner wall of the outer supporting shell through the connecting rods, the influence of the connecting rods on the overall performance of the fan is small, the wind resistance is low, guide vane design is not needed, and the energy consumption is low.

(5) The outer support shell is provided with the interface hole, so that the motor wiring is facilitated, and the power interface can be flexibly arranged in the interface hole according to actual application scenes.

(6) According to the utility model, the mounting plate is arranged at one end of the outer support shell, which is close to the air outlet, so that the fan can be conveniently mounted and fixed.

Drawings

In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which

Fig. 1 is a schematic diagram of airflow direction of a conventional centrifugal axial flow fan.

Fig. 2 is a schematic structural view of the present utility model.

Fig. 3 is a top view of fig. 2.

Fig. 4 is a bottom view of fig. 2.

Fig. 5 is a perspective view of the present utility model.

Fig. 6 is an exploded view of the present utility model.

FIG. 7 is a schematic diagram of the airflow direction of the present utility model.

The reference numerals in the drawings are:

the air conditioner comprises a shell 1, an air inlet 1-1, an air outlet 1-2, a fan upper shell 1-3, a motor support shell 1-4, an outer support shell 1-4-1, an inner support shell 1-4-2, a connecting rod 1-4-3, an interface hole 1-4-4, a mounting plate 1-4-5, a mounting hole 1-4-6, a motor 2 and a centrifugal impeller 3.

Detailed Description

In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present utility model, it should be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate orientations or positional relationships based on those shown in the drawings, or those conventionally put in place when the inventive product is used, or those conventionally understood by those skilled in the art, merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. The utility model is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model.

Example 1

Referring to fig. 2 to 7, the centrifugal axial flow fan of the present embodiment includes a housing 1, and a motor 2 and a centrifugal impeller 3 provided in the housing 1.

The centrifugal impeller 3 is fixed to the output shaft of the motor 2. One end of the shell 1 along the axial direction is provided with an air inlet 1-1, and the other end is provided with an air outlet 1-2. The centrifugal impeller 3 is arranged close to the air inlet 1-1 of the shell 1, an air flow passage is arranged in the centrifugal impeller 3, the inlet direction of the air flow passage is opposite to the air inlet 1-1 of the shell 1, and the outlet of the air flow passage is annular and faces the air outlet 1-2 of the shell 1. As shown in fig. 7, the design of this embodiment changes the air outlet direction of the outlet of the centrifugal impeller 3 from radial to axial, so that the collision between the air flow thrown out from the centrifugal impeller 3 and the inner wall of the casing can be well avoided, thereby reducing energy consumption and directly realizing the function of axial air outlet of the centrifugal impeller 3. After the power is on, the motor 2 drives the centrifugal impeller 3 to rotate, air flow enters from the air inlet 1-1, and flows out along the rotation of the centrifugal impeller 3, and the outflow direction is the axial direction. Different from the airflow direction of the existing centrifugal axial flow fan.

The air flow passage in the centrifugal impeller 3 sequentially comprises an axial air inlet section, a radial air guide section and an axial air outlet section from the inlet to the outlet, and the radial air guide section is provided with a plurality of air guide sections and is in spiral divergent arrangement. The radial air guide section and the axial air inlet section and the radial air guide section and the axial air outlet section are in arc transition, so that the impact of air flow on the inner wall of the air flow channel can be reduced, and the energy consumption and noise are reduced. The edge of the centrifugal impeller 3 is curved in a direction facing away from the air flow channel inlet so that the outlet of the air flow channel of the centrifugal impeller 3 is directed towards the air outlet 1-2 of the housing 1.

The housing 1 includes a fan upper case 1-3 and a motor support case 1-4. One end of the motor supporting shell 1-4 in the axial direction is open, and the other end is provided with an air outlet 1-2. The upper fan shell 1-3 is fixed at the open end of the motor supporting shell 1-4, and the air inlet 1-1 is arranged on the upper fan shell 1-3. The motor support shell 1-4 comprises an outer support shell 1-4-1, an inner support shell 1-4-2 and a connecting rod 1-4-3. The outer wall of the inner supporting shell 1-4-2 is connected with the inner wall of the outer supporting shell 1-4-1 through a plurality of connecting rods 1-4-3, and an air outlet 1-2 is formed between the outer supporting shell 1-4-1 and the inner supporting shell 1-4-2. Compared with the existing centrifugal axial-flow fan, the quality of the fan performance is directly determined by the good or bad of the guide vane design, the influence of the connecting rods 1-4-3 on the overall performance of the fan is small, the wind resistance is low, the guide vane design is not needed, and the energy consumption is low. The connecting rod 1-4-3 can be made into a simple cylinder shape, so that the processing difficulty of the fan shell is reduced. The motor 2 is fixed in the inner supporting shell 1-4-2, and the fan upper shell 1-3 is fixedly connected with one end of the outer supporting shell 1-4-1.

In order to facilitate wiring of the motor 2, the outer support shell 1-4-1 is provided with an interface hole 1-4-4, a power interface connected with the motor 2 is arranged in the interface hole 1-4-4, and the power interface can be flexibly selected according to practical application scenes. In order to facilitate the installation and fixation of the fan, one end of the outer support shell 1-4-1, which is close to the air outlet 1-2, is provided with a mounting plate 1-4-5, and the mounting plate 1-4-5 is provided with a mounting hole 1-4-6, so that the existing axial flow fan with corresponding size can be directly replaced.

The assembly process of the centrifugal axial flow fan of the embodiment is as follows: and assembling and dispensing the motor 2 and the motor support shell 1-4 by means of interference fit, installing the centrifugal impeller 3 after the assembly is completed, and finally installing the upper fan shell 1-3, wherein the upper shell and the motor support shell 1-4 are adhered by using glue, so that the assembly of the whole fan in the embodiment is completed.

While the foregoing is directed to embodiments of the present utility model, other and further details of the utility model may be had by the present utility model, it should be understood that the foregoing description is merely illustrative of the present utility model and that no limitations are intended to the scope of the utility model, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the utility model.

Claims

1. A centrifugal axial flow fan, which comprises a shell (1), a motor (2) and a centrifugal impeller (3) which are arranged in the shell (1); the centrifugal impeller (3) is fixed on an output shaft of the motor (2); the method is characterized in that: one end of the shell (1) along the axial direction is provided with an air inlet (1-1), and the other end is provided with an air outlet (1-2); the centrifugal impeller (3) is arranged close to the air inlet (1-1) of the shell (1), an air flow passage is arranged in the centrifugal impeller (3), the inlet direction of the air flow passage is opposite to the air inlet (1-1) of the shell (1), and the outlet of the air flow passage is annular and faces the air outlet (1-2) of the shell (1).

2. A centrifugal axial flow fan according to claim 1, wherein: the air flow channel in the centrifugal impeller (3) sequentially comprises an axial air inlet section, a radial air guide section and an axial air outlet section from an inlet to an outlet; the radial wind guide section is provided with a plurality of radial wind guide sections.

3. A centrifugal axial flow fan according to claim 2, wherein: and arc transition is performed between the radial air guide section and the axial air inlet section and between the radial air guide section and the axial air outlet section of the air flow channel in the centrifugal impeller (3).

4. A centrifugal axial flow fan according to claim 2, wherein: the radial air guide sections of the air flow channel in the centrifugal impeller (3) are arranged in a spiral divergent mode.

5. A centrifugal axial flow fan according to claim 1, wherein: the edge of the centrifugal impeller (3) is curved in a direction facing away from the air flow channel inlet.

6. A centrifugal axial flow fan according to claim 1, wherein: the shell (1) comprises a fan upper shell (1-3) and a motor support shell (1-4); one axial end of the motor supporting shell (1-4) is open, and the other axial end of the motor supporting shell is provided with the air outlet (1-2); the upper fan shell (1-3) is fixed at the open end of the motor supporting shell (1-4), and the air inlet (1-1) is arranged on the upper fan shell (1-3).

7. The centrifugal axial flow fan according to claim 6, wherein: the motor support shell (1-4) comprises an outer support shell (1-4-1), an inner support shell (1-4-2) and a connecting rod (1-4-3); the outer wall of the inner supporting shell (1-4-2) is connected with the inner wall of the outer supporting shell (1-4-1) through a plurality of connecting rods (1-4-3), and the air outlet (1-2) is formed between the outer supporting shell (1-4-1) and the inner supporting shell (1-4-2); the motor (2) is fixed in the inner supporting shell (1-4-2); the upper shell (1-3) of the fan is fixedly connected with one end of the outer supporting shell (1-4-1).

8. The centrifugal axial flow fan according to claim 7, wherein: the outer support shell (1-4-1) is provided with an interface hole (1-4-4), and a power interface connected with the motor (2) is arranged in the interface hole (1-4-4).

9. The centrifugal axial flow fan according to claim 7, wherein: one end of the outer support shell (1-4-1) close to the air outlet (1-2) is provided with a mounting plate (1-4-5); the mounting plate (1-4-5) is provided with mounting holes (1-4-6).