阅读说明：本技术 蜗壳风机 (Volute fan ) 是由 马晓伟 于 2019-05-13 设计创作，主要内容包括：本发明提供一种蜗壳风机,包括：离心风机和蜗壳；所述离心风机包括叶轮；所述蜗壳包括顶板,侧面围板和底板；所述底板上设置进风口和出风口；所述叶轮与所述出风口之间设置风道；所述蜗壳的高度与所述叶轮的比值在0.8～1.3之间。优选地,上述蜗壳风机中,所述离心风机的出风面积与所述出风口面积的比值为0.8～1.4。如上所述,本发明的蜗壳风机,通过去蜗壳和风道的设计,使其能适用于较封闭空间内的空气循环,以及空间内与空间外的气体交换,并且风速衰减率更低、噪音更小。(The invention provides a volute fan, comprising: a centrifugal fan and a volute; the centrifugal fan comprises an impeller; the volute comprises a top plate, a side coaming and a bottom plate; the bottom plate is provided with an air inlet and an air outlet; an air duct is arranged between the impeller and the air outlet; the ratio of the height of the volute to the impeller is 0.8-1.3. Preferably, in the volute fan, the ratio of the air outlet area of the centrifugal fan to the air outlet area is 0.8-1.4. As mentioned above, the volute fan of the invention is suitable for air circulation in a closed space and gas exchange between the inside and the outside of the space through the design of the volute and the air duct, and has lower wind speed attenuation rate and lower noise.)

1. A volute blower, comprising:

a centrifugal fan and a volute;

the centrifugal fan comprises an impeller;

the volute comprises a top plate, a side coaming and a bottom plate; the bottom plate is provided with an air inlet and an air outlet;

an air duct is arranged between the impeller and the air outlet;

the ratio of the height of the volute to the impeller is 0.8-1.3.

2. The volute blower of claim 1, wherein a ratio of an air outlet area of the centrifugal blower to the air outlet area is 0.8-1.4.

Technical Field

The invention relates to a volute fan which is used for gas circulation and exchange in a relatively closed space and between the inside and the outside of the relatively closed space.

Background

A common volute fan in the market is shown in fig. 1, and an air inlet direction and an air outlet direction of the volute fan are perpendicular to each other. The volute fan is suitable for enabling gas in a closed space to be filled into the closed space in a concentrated mode, but is not suitable for promoting the exchange of the gas in the closed space and outside gas, and is also not suitable for promoting the circulation of airflow in the closed space. However, in practice, for example, in the indoor air circulation, the pet room, the pet dryer and other spaces, the air circulation is needed, and the air exchange is needed between the inside and outside of the space, so that the conventional volute fan cannot meet the requirement in the application scene.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a volute fan, which is used to solve the problem that the existing volute fan cannot adapt to the gas circulation in a relatively closed space and the gas exchange between the inside and outside of the relatively closed space.

To achieve the above and other related objects, the present invention provides a volute blower comprising: a centrifugal fan and a volute; the centrifugal fan comprises an impeller; the volute comprises a top plate, a side coaming and a bottom plate; the bottom plate is provided with an air inlet and an air outlet; an air duct is arranged between the impeller and the air outlet; the ratio of the height of the volute to the impeller is 0.8-1.3. Preferably, in the volute fan, the ratio of the air outlet area of the centrifugal fan to the air outlet area is 0.8-1.4.

As mentioned above, the volute fan of the invention is suitable for air circulation in a closed space and gas exchange between the inside and the outside of the space through the design of the volute and the air duct, and has lower wind speed attenuation rate and lower noise.

Drawings

FIG. 1 is a perspective view of a prior art volute blower;

FIG. 2 is a perspective view of one embodiment of the volute blower of the present invention;

FIG. 3 is an exploded view of the centrifugal fan and volute of the embodiment of FIG. 2;

FIG. 4 is a top view of the embodiment of FIG. 2;

FIG. 5 is a cross-sectional view taken along direction A in FIG. 4;

fig. 6 is a diagram of an application scenario of the volute blower of the present invention.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

Please refer to the attached drawings. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

Figure 2 is a perspective view of one embodiment of the volute blower of the present invention. The volute fan comprises a centrifugal fan 1 and a volute, wherein the volute comprises a top plate 2, a side enclosing plate 3 and a bottom plate 4 (shown in figure 5), it is noted that the top plate, the side enclosing plate or the bottom plate of the volute can also be wholly or partially designed in an integrated mode, and the top plate, the side enclosing plate and the bottom plate are only used for convenience in description and are not limited to a mode that three plates are spliced to form the volute. Fig. 3 is an exploded view of the centrifugal fan 1 and the volute. As can be seen from the figure, the bottom plate 4 of the volute is provided with an air inlet 5 and an air outlet 6, and one or more air outlets 6, in this example 4, may be provided according to actual needs. The volute fan 1 comprises an impeller 8. An air duct 9 is arranged between the impeller 8 and the air outlet 6. In this example, the air duct 9 is surrounded by the volute top plate 2, the side wall plate 3 and the bottom plate 4. When the centrifugal fan works, the motor of the centrifugal fan 1 drives the impeller 8 to rotate, air is pressed to the air outlet through the air channel, so that negative pressure is formed at the air inlet 5, high pressure is formed at the air outlet 6, and the air inlet direction and the air outlet direction form an angle of 180 degrees (as shown in fig. 5).

The design has the advantage that the air outlet is slightly treated, so that air circulation in a closed space and gas exchange between the inside and the outside of the space can be realized. One way of doing this is shown in fig. 6, an air duct and an air outlet are provided on the column of the container, and then the air duct of the column is abutted to the air outlet 6 of the volute blower, so that sufficient air circulation can be formed in the container. The container can be regarded as a pet house, a pet dryer and even a house model for human living.

In the process of air being sucked from the air inlet 5 to be pressed out from the air outlet 6, the speed of the air flow is attenuated due to friction with the inner surface of the volute and the like. To minimize this attenuation, the shape of the volute needs to be optimally designed.

The first optimization mode is to set the extension parts of the top plate and the bottom plate of the volute to incline towards the air outlet direction, more preferably to incline in an arc manner, as shown in fig. 5, the inclination degree can be measured by an included angle α between a straight line AB and the horizontal direction, wherein, the point A represents the central point of the edge of the centrifugal fan, and the point B is the central point of the height of the side coaming 3 at the edge of the volute close to the air outlet.

The second optimization mode is to set the inner wall of the air duct 9 to be arc-shaped, so that the optimization can not only reduce the attenuation of the wind speed, but also reduce the noise. In this example, the air duct 9 is defined by the volute top plate 2, the side wall plates 3 and the bottom plate 4, and the side walls of the air duct 9, namely the side wall plates 3, are arranged in an arc shape. More preferably, the arc top of the side wall plate 3 is tangent to the circumference of the centrifugal fan 1. More preferably, the inner side wall, the top wall and the bottom wall of the air duct 9 are also rounded at the connection points (not shown in the drawings).

The third optimization method is to optimize the height h of the volute₁Is arranged to be close to the height h of the centrifugal fan impeller 8₂. Experiments prove that h₁And h₂Should be between 0.8 and 1.3.

The fourth optimization mode is to control the proportional relation between the area of the air outlet and the air outlet area of the centrifugal fan 1. Air outlet area S of centrifugal fan 1₁By multiplying the circumference of the bottom surface of the centrifugal fan 1 by the height h of the centrifugal fan 1₂Calculating the area S of the air outlet₂Should be the sum of the areas of the plurality of outlets 6. Experiments show that S₁∶S₂The ratio of (A) should be controlled between 0.8 and 1.4.

In summary, the present invention realizes 180-degree reverse rotation of the air inlet and the air outlet of the volute blower by the design of the volute, so that the volute blower is more suitable for air circulation in a closed space and gas exchange between the inside of the closed space and the outside of the space. In addition, through the preferred embodiment, the wind speed attenuation from the air inlet to the air outlet is reduced, and the noise is greatly reduced, so that the scheme of the invention has high industrial utilization value.

In addition, the above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention, for example, in fig. 4, the side wall 3 from the air outlet 6 to the circumferential portion of the centrifugal fan 1 can be designed as a straight line, or can be designed as a plurality of segments directly spliced into a nearly arc shape. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.