CN211778218U - Anti-surge fans and air conditioners - Google Patents

Abstract

The utility model provides an anti-surge fan and an air conditioner. The anti-surge fan comprises a volute and an impeller, the volute forms an air outlet, the inner side of the volute includes a volute tongue, and the outer side of the volute includes a first arc shaped part and a straight part close to the air outlet. Fan surge is mainly due to the periodic eddy current phenomenon inside the fan. In this technical solution, the specific size of the volute is specifically designed. Due to the relative position and size of the volute and the impeller, the surge can be significantly reduced. Vibration, which restricts the control of airflow.

Description

Anti-surge fans and air conditioners

technical field

The utility model relates to the field of air-conditioning equipment, in particular to an anti-surge fan and an air conditioner.

Background technique

Cross-flow fans are widely used in indoor units of household air conditioners. Because they are used indoors, noise control is very important. If the noise is too loud, it will affect the user's experience. During the trial production stage of the indoor unit, the phenomenon of surge occurs frequently, and the noise accompanying the surge will greatly affect the comfort of people. However, there are currently no design methods and guidelines for preventing surge phenomena. The experimental study found that the structure of sections a and b of the volute casing of the cross-flow fan and the spacing c of the volute tongue have obvious effects on the severity of the fan surge.

Utility model content

In order to solve at least one of the above problems, an anti-surge fan provided by the present invention includes a volute and an impeller, the volute forms an air outlet, the inner side of the volute includes a volute tongue, and the outer side of the volute includes a first An arc part and a straight part close to the air outlet.

The surge of the fan is mainly due to the periodic eddy current phenomenon inside the fan. In this technical solution, the specific size of the volute is specifically designed. Due to the relative position and size of the volute and the impeller, the surge can be significantly reduced. Vibration, which restricts the control of airflow.

Preferably, the first arc-shaped portion and the straight portion are connected by a joint point, and the difference y between the distance L from the joint point to the center of the impeller and the radius R of the impeller and the radius R of the impeller The ratio w is between 0.68 and 0.78, i.e.

w=y/R=0.73±0.05, where y=L-R.

When the w value is controlled between 0.68 and 0.78, the internal turbulence can be reduced and the vibration can be reduced.

Preferably, the impeller area opposite to the first arc-shaped portion constitutes an airflow passing area, and the included angle formed by the direction of the airflow velocity passing through the impeller blades at the airflow passing area and the straight portion is the outlet angle of attack β,

The maximum exit angle of attack is: β=40°±2°.

When the outlet attack angle β is controlled between 38° and 42°, the internal turbulence can be reduced and the vibration can be reduced.

Preferably, the outlet attack angle β is an angle formed by the tangential direction of the impeller blade of the airflow passing area and the straight line portion.

Preferably, the vertical distance C from the inner wall of the volute tongue to the outer edge of the impeller is equal to 3.1mm-3.5mm.

Preferably, the volute tongue and the air outlet are connected by a second arc portion. Connecting them through a second arc at this point makes the transition smoother and reduces the degree of turbulence.

Preferably, w=0.73.

Preferably, β=40°.

When w=0.73 and β=40°, the turbulence is the lowest at this time, and the vibration is reduced to the greatest extent.

Preferably, the cross section of the air outlet (12) increases along the flow direction of the airflow. Due to the high air pressure inside the air outlet, in order to enable the device to transmit the airflow to a farther place and make the temperature inside the space more uniform, the air outlet is set to increase along the flow direction of the airflow. Air flow is sent further away.

The present application also provides an air conditioner, including the fan according to any one of the above technical solutions.

Description of drawings

Fig. 1 is the schematic diagram of the first arc portion and the straight line portion and the connecting point;

Figure 2 is a schematic diagram of the outlet angle of attack β;

FIG. 3 is a schematic diagram of the vertical distance from the inner wall of the volute tongue to the outer edge of the impeller.

Description of reference numbers:

Volute 1, first arc portion 11, air outlet 12, connection point 13, straight portion 121

volute tongue 14, second arc portion 15;

The impeller 2 , the airflow passing area 21 .

Detailed ways

In order to make the above objects, features and advantages of the present utility model more clearly understood, the specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

An anti-surge fan provided in the first embodiment includes a volute 1 and an impeller 2, the volute 1 forms an air outlet 12, and the inner side of the volute 1 includes a volute tongue 14, characterized in that: the volute 1 The outer side of the casing 1 includes a first arc portion 11 and a straight portion 121 close to the air outlet 12 . The surge of the fan is mainly due to the periodic eddy current phenomenon inside the fan. In this technical solution, the specific size of the volute is specifically designed. Due to the relative position and size of the volute and the impeller, the surge can be significantly reduced. Vibration, which restricts the control of airflow.

On the basis of the above embodiment, the first arc portion 11 and the straight portion 121 are connected by a joint point 13 , and the distance L from the joint point 13 to the center of the impeller 2 is the radius R of the impeller 2 . The ratio w of the difference y to the radius R of the impeller 2 is between 0.68 and 0.78, that is

w=y/R=0.73±0.05, where y=L-R.

When the w value is controlled between 0.68 and 0.78, the internal turbulence can be reduced and the vibration can be reduced.

As shown in FIG. 1 , the first arc-shaped part 11 is the arc-shaped part at AB, the straight part 121 is the part shown in BC in the figure, the connecting point 13 is at point B, the center of the impeller is point O, where L is the distance from point B to point O, which is the length of BO. The difference between the length of BO and the impeller radius R is y. According to the simulation calculation, when the ratio of y to R is between 0.68 and 0.78, the degree of turbulence is the lowest. Reduced surge.

In another embodiment, the outlet angle of attack β is simulated, and the area of the impeller 2 opposite to the first arc-shaped portion 11 constitutes the airflow passing area 21 , and the airflow velocity direction of the airflow passing through the blades of the impeller 2 at the airflow passing area 21 The angle formed with the straight portion 121 is the exit angle of attack β,

The maximum exit angle of attack is: β=40°±2°.

When the outlet attack angle β is controlled between 38° and 42°, the internal turbulence can be reduced and the vibration can be reduced.

As shown in Figure 2, the area enclosed by the dotted line in the figure is the airflow passing area 21. The airflow is driven by the impeller and controlled by the inner wall of the BC, and the airflow moves outward from the space between the two. The included angle of 121BC is the outlet angle of attack β, and controlling the outlet attack angle β to be between 38° and 42° reduces the degree of turbulence and minimizes surge.

On the basis of the above technical solutions, the outlet attack angle β is the angle formed by the tangential direction of the blades of the impeller 21 in the airflow passing area 21 and the straight portion 121 .

The outlet attack angle β can also be described as the included angle between the tangential direction of the blade of the impeller 21 and the straight portion 121BC.

It can be known by simulation that the vertical distance C from the inner wall of the volute tongue 14 to the outer edge of the impeller 2 is equal to 3.1 mm-3.5 mm.

As shown in FIG. 3 , the distance between the inner wall of the volute tongue 14 and the closest impeller also affects the occurrence of turbulence. Setting this distance C to a specific distance through simulation can reduce the degree of turbulence and reduce the surge to the greatest extent.

In addition, the volute tongue 14 and the air outlet 12 are connected by a second arc portion 15 . Connecting them through a second arc at this point makes the transition smoother and reduces the degree of turbulence.

In a specific embodiment, w=0.73, β=40°.

When w=0.73 and β=40°, the turbulence is the lowest at this time, and the vibration is reduced to the greatest extent.

According to the specific parameter control given in the above embodiment, different forms of control surge can be obtained according to different combinations of specific parameters:

(1) An anti-surge fan, whose volute has the following parameters:

The first arc-shaped portion 11 and the straight portion 121 are connected by a joint point 13, and the difference y between the distance L from the joint point 13 to the center of the impeller 2 and the radius R of the impeller 2 and the impeller 2 The ratio w of the radius R is between 0.68 and 0.78, i.e.

w=y/R=0.73±0.05, where y=L-R.

At the same time, the area of the impeller 2 opposite to the first arc-shaped portion 11 constitutes an airflow passing area 21 , and the angle formed by the direction of the airflow velocity passing through the blades of the impeller 2 at the airflow passing area 21 and the straight portion 121 is the outlet angle of attack β , where the maximum exit angle of attack is: β=40°±2°.

(2) An anti-surge fan, the volute of which has the following parameters:

The first arc-shaped portion 11 and the straight portion 121 are connected by a joint point 13, and the difference y between the distance L from the joint point 13 to the center of the impeller 2 and the radius R of the impeller 2 and the impeller 2 The ratio w of the radius R is between 0.68 and 0.78, i.e.

w=y/R=0.73±0.05, where y=L-R.

Meanwhile, the vertical distance C from the inner wall of the volute tongue 14 to the outer edge of the impeller 2 is equal to 3.1 mm.

(3) an anti-surge fan, the volute has the following parameters:

The area of the impeller 2 opposite to the first arc-shaped portion 11 constitutes an airflow passing area 21, and the angle formed by the direction of the airflow velocity passing through the blades of the impeller 2 at the airflow passing area 21 and the straight portion 121 is the outlet angle of attack β, The maximum exit angle of attack is: β=40°±2°.

Meanwhile, the vertical distance C from the inner wall of the volute tongue 14 to the outer edge of the impeller 2 is equal to 3.1 mm.

(4) An anti-surge fan, the volute of which has the following parameters:

The first arc-shaped portion 11 and the straight portion 121 are connected by a joint point 13, and the difference y between the distance L from the joint point 13 to the center of the impeller 2 and the radius R of the impeller 2 and the impeller 2 The ratio w of the radius R is between 0.68 and 0.78, i.e.

w=y/R=0.73±0.05, where y=L-R.

At the same time, the area of the impeller 2 opposite to the first arc-shaped portion 11 constitutes an airflow passing area 21 , and the angle formed by the direction of the airflow velocity passing through the blades of the impeller 2 at the airflow passing area 21 and the straight portion 121 is the outlet angle of attack β , where the maximum exit angle of attack is: β=40°±2°

The vertical distance C from the inner wall of the volute tongue 14 to the outer edge of the impeller 2 is equal to 3.1 mm.

The anti-surge fan of the above-mentioned specific parameters is the ratio w of the difference y between the distance L from the connection point 13 to the center of the impeller 2 and the radius R of the impeller 2 and the radius R of the impeller 2, the outlet angle of attack β and The vertical distance from the inner wall of the volute tongue 14 to the outer edge of the impeller 2 is a specific embodiment of the combination of these three parameters, and an anti-surge fan that meets the above three parameters at the same time.

In actual use, only one of the parameters can be changed in an anti-surge fan according to the actual situation, so as to reduce the cost.

In order to enable the anti-surge fan to send the internal air flow farther, the cross section of the air outlet 12 increases along the flow direction of the air flow. Due to the high air pressure inside the air outlet, in order to enable the device to transmit the airflow to a farther place and make the temperature inside the space more uniform, the air outlet is set to increase along the flow direction of the airflow. Air flow is sent further away.

The present application also provides an air conditioner, including the fan according to any one of the above technical solutions.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (10)

1. An anti-surge fan, includes spiral case (1) and impeller (2), spiral case (1) forms air outlet (12), spiral case (1) inboard includes volute tongue (14), its characterized in that: the outer side of the volute (1) comprises a first arc-shaped part (11) and a straight line part (121) close to the air outlet (12).

2. The fan of claim 1, wherein: the first arc-shaped part (11) and the straight line part (121) are connected by a joint point (13), and the ratio w of the difference y between the distance L from the center of the impeller (2) at the joint point (13) and the radius R of the impeller (2) to the radius R of the impeller (2) is between 0.68 and 0.78, namely

w is 0.73 + -0.05, wherein y is L-R.

3. The fan of claim 1, wherein: the area of the impeller (2) opposite to the first arc-shaped part (11) forms an airflow passing area (21), an included angle formed by the airflow speed direction of the impeller (2) passing through the blades of the impeller (2) at the airflow passing area (21) and the straight line part (121) is an outlet attack angle beta,

wherein the maximum exit attack angle is: β is 40 ° ± 2 °.

4. The fan of claim 3, wherein: the outlet attack angle beta is an included angle formed by the tangential direction of the blades of the impeller (2) in the airflow passing area (21) and the straight line part (121).

5. The fan of claim 1, wherein: the vertical distance C from the inner wall of the volute tongue (14) to the outer edge of the impeller (2) is equal to 3.1mm-3.5 mm.

6. The fan of claim 5, wherein: the volute tongue (14) is connected with the air outlet (12) through a second arc-shaped part (15).

7. The fan of claim 2, wherein: w is 0.73.

8. The fan of claim 3, wherein: β is 40 °.

9. The fan of claim 2, wherein: the cross section of the air outlet (12) is increased along the airflow flowing direction.

10. An air conditioner, characterized in that: comprising a fan according to any of claims 1-8.

Images