CN202883485U - Cross flow fan - Google Patents

Abstract

The utility model discloses a cross flow fan which comprises a volute casing. A cross flow wind turbine is arranged in the volute casing, and the volute casing comprises a diffusion section and a volute tongue connected to the inner side end of the diffusion section. The volute tongue comprises a combination portion connected with the diffusion section and an extended section extended outwards from the combination portion, and the section of the combination portion is step-shaped. According to the cross flow fan, a volute structure with a step-shaped section is utilized so as to change an existing single volute tongue structure into the step-shaped volute structure comprising two or more than two small volute tongues. A minimum gap between the volute tongue and the outer edge of the wind turbine is ensured, in addition, impact on the volute tongue by air currents is reduced, a flow field in the wind turbine is optimized, and eddy at the volute tongue is restrained. Performance of the wind turbine is ensured, meanwhile, eddy noise of the wind turbine is effectively reduced, tone quality is improved, and efficiency of the cross flow wind turbine is improved.

Description

cross flow fan

technical field

The utility model relates to the technical field of air treatment equipment, in particular to a cross-flow fan with low noise and high efficiency.

Background technique

At present, cross-flow fans are widely used in the fields of air conditioning and ventilation equipment because of their advantages such as appropriate pressure head, slender shape, free choice of the length of the wind wheel according to the air volume requirements, and easy installation with buildings.

However, with the improvement of people's requirements for the comfort of living and working environments, the requirements for noise reduction of equipment using cross-flow fans in various fields are also continuously increasing. In the cross-flow fan, the vortex tongue itself is a noise source, and its shape and distance from the outer edge of the cross-flow fan are the decisive factors affecting the performance and noise quality of the cross-flow fan.

As shown in Figure 1, the existing cross-flow fan includes a volute 20 and a cross-flow fan wheel 10, the volute 20 is provided with a volute tongue 30 at the inner end of the diffuser section 40, and the volute tongue of the existing cross-flow fan volute 20 30 is a single vortex tongue formed by a smooth arc surface. When the minimum clearance distance between the vortex tongue 30 and the outer edge of the cross-flow fan 10 is small, the pressure head of the cross-flow fan rises and the flow rate increases, but when the air flow passes through the vortex When there is a gap between the tongues 30, the impact on the vortex tongue 30 is also large, so the noise is increased, and even a howling sound is generated; The impact of the tongue 30 will increase the eddy current at the vortex tongue 30, and will lead to a decrease in the flow rate and pressure head, and also increase the power of the cross-flow fan, thereby reducing the efficiency of the fan.

In order to avoid the loss caused by too large or too small clearance of the vortex tongue, the minimum distance between the vortex tongue and the outer edge of the cross-flow rotor should be kept in an optimal range, but the existing design and manufacturing technology of the vortex tongue structure cannot solve the above problems. question.

Utility model content

The main purpose of the utility model is to provide a cross-flow fan, which aims to reduce the noise of the cross-flow fan, reduce the flow loss of the cross-flow fan, and improve the efficiency of the cross-flow fan.

In order to achieve the above purpose, the utility model proposes a cross-flow fan, which includes a volute, and a cross-flow fan is installed in the volute, and the volute includes a diffuser section and a vortex tongue connected to the inner end of the diffuser section. The volute tongue includes a joint portion connected to the diffuser section and an extension section extending outward from the joint portion, and the cross section of the joint portion is stepped.

Preferably, the joint portion is formed by a stepped arrangement of at least two concave arc-shaped portions.

Preferably, the step-shaped cross-sectional dimension of the joint portion of the vortex tongue remains unchanged along the axial direction of the cross-flow impeller.

Preferably, the step-shaped cross-sectional size of the joint portion of the vortex tongue changes continuously along the axial direction of the cross-flow impeller.

Preferably, the radius dimension of the arc portion remains constant along the axial direction of the cross-flow rotor.

Preferably, the radius dimension of the arc portion changes continuously along the axial direction of the cross-flow rotor.

Preferably, the extension section is a straight section.

A cross-flow fan proposed by the utility model adopts a vortex tongue structure with a trapezoidal cross section, and changes the existing single vortex tongue structure into a stepped vortex tongue structure including two or more small vortex tongues. It ensures the minimum gap between the vortex tongue and the outer edge of the cross-flow wind wheel, reduces the impact of the airflow on the vortex tongue, optimizes the internal flow field of the fan, and suppresses the vortex at the vortex tongue. While ensuring the performance of the fan, it effectively reduces the The eddy current noise of the fan improves the sound quality and improves the efficiency of the cross-flow fan.

Description of drawings

Fig. 1 is the structural representation of existing cross flow fan;

Fig. 2 is a structural schematic diagram of the first embodiment of the utility model cross-flow fan;

Fig. 3 is a schematic structural view of the second embodiment of the cross-flow fan of the present invention.

In order to make the technical solution of the utility model clearer and clearer, it will be further described in detail below in conjunction with the accompanying drawings.

Detailed ways

The main solution of the utility model is: to adopt a vortex tongue structure with a stepped cross-section consisting of two or more small vortex tongues, so that the gap between the outer edge of the cross-flow wind rotor and the vortex tongue is in the radial direction of the wind rotor. The upper step changes to optimize the internal flow field of the cross-flow fan, reduce the noise of the fan, improve the sound quality, reduce the internal flow loss, and improve the efficiency of the cross-flow fan.

Please refer to FIG. 2 , which is a schematic structural view of the first embodiment of the cross-flow fan of the present invention.

As shown in Figure 2, a cross-flow fan proposed in this embodiment includes a volute 2, a cross-flow fan 1 is installed in the volute 2, and the volute 2 includes a diffuser section 4 and is connected to the diffuser The swirl tongue 3 at the inner end of the section 4, the swirl tongue 3 includes a junction connected with the diffuser section 4 and a linear extension extending outward from the junction, the section of the junction is stepped, and the outer port of the diffuser section 4 is Air outlet 5.

Specifically, the joint portion of the vortex tongue 3 in this embodiment includes two concave arc-shaped portions 3a, 3b, and the two concave arc-shaped portions 3a, 3b are arranged continuously in steps to form two small vortex tongues; The stepped arrangement of small vortex tongues needs continuous and smooth transition.

Wherein, the step-shaped cross-sectional size of the joint portion of the vortex tongue 3 can be set to remain unchanged along the axial direction of the cross-flow rotor 1 . Alternatively, the stepped cross-sectional size of the joint portion of the volute tongue 3 may also be set to change continuously along the axial direction of the cross-flow impeller 1 .

Similarly, the radius dimension of the arc portion 3a, 3b of the vortex tongue 3 (that is, the radius dimension of the small vortex tongue) can be set to remain unchanged along the axial direction of the cross-flow rotor 1; the radius dimension of the arc portion can also be set along the The axial direction of the cross-flow wind rotor 1 changes continuously.

This embodiment adopts the above-mentioned vortex tongue structure with trapezoidal cross-section, and changes the existing single vortex tongue structure into more than two stepped vortex tongue structures, which not only ensures the minimum gap between the vortex tongue 3 and the outer edge of the cross-flow rotor 1, It also reduces the impact of the airflow on the vortex tongue 3, optimizes the internal flow field of the fan, and suppresses the eddy current at the vortex tongue 3. While ensuring the performance of the fan, it effectively reduces the vortex noise of the fan, improves the sound quality, and improves the consistency. The efficiency of the blower.

In other embodiments, the vortex tongue 3 of the cross-flow fan can also be configured to be composed of more than two small vortex tongues arranged in steps, wherein more than two small vortex tongues arranged in steps need to be continuously and smoothly transitioned. As shown in Figure 3, Figure 3 is a schematic structural view of the second embodiment of the cross-flow fan of the present invention, wherein the vortex tongue 3 includes three small vortex tongues 3c, 3d, and 3e arranged in a stepped shape, and others are the same as those of the first embodiment Example is the same.

The cross-flow fan of the utility model adopts a vortex tongue structure with a trapezoidal cross-section, and changes the conventional single vortex tongue structure into two or more stepped vortex tongue structures, which not only ensures the minimum distance between the vortex tongue 3 and the outer edge of the cross-flow wind wheel 1 The gap reduces the impact of the airflow on the vortex tongue 3, optimizes the internal flow field of the fan, and suppresses the eddy current at the vortex tongue 3. While ensuring the performance of the fan, it effectively reduces the vortex noise of the fan, improves the sound quality, and improves cross-flow fan efficiency.

The utility model is suitable for indoor units of split air conditioners, window air conditioners, air curtain devices, dehumidifiers and other air equipment.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the patent scope of the present utility model. Any equivalent structure or process transformation made by using the specification of the utility model and the contents of the accompanying drawings, or directly or indirectly used in other related All technical fields are all included in the scope of patent protection of the utility model in the same way.

Claims (7)

1. cross flow fan, comprise volute, tubular wine wheel is installed in the volute, described volute comprises diffuser and is connected to the whirlpool tongue of described diffuser medial extremity, it is characterized in that, described whirlpool tongue comprises the connecting part that is connected with described diffuser and by outward extending extension, described connecting part, the cross section of described connecting part is stepped.

2. cross flow fan according to claim 1 is characterized in that, described connecting part is made of the curved portions step arrangement of two indents at least.

3. cross flow fan according to claim 1 is characterized in that, the stepped cross-section size of the connecting part of described whirlpool tongue remains unchanged along the axial direction of described tubular wine wheel.

4. cross flow fan according to claim 1 is characterized in that, the stepped cross-section size of the connecting part of described whirlpool tongue changes continuously along the axial direction of described tubular wine wheel.

5. cross flow fan according to claim 2 is characterized in that, the radius size of described curved portions remains unchanged along the axial direction of described tubular wine wheel.

6. cross flow fan according to claim 2 is characterized in that, the radius size of described curved portions changes continuously along the axial direction of described tubular wine wheel.

7. each described cross flow fan is characterized in that according to claim 1-6, and described extension is straightway.

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