CN211623819U - Volute for centrifugal fan, centrifugal fan and range hood - Google Patents
Volute for centrifugal fan, centrifugal fan and range hood Download PDFInfo
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- CN211623819U CN211623819U CN201922218499.4U CN201922218499U CN211623819U CN 211623819 U CN211623819 U CN 211623819U CN 201922218499 U CN201922218499 U CN 201922218499U CN 211623819 U CN211623819 U CN 211623819U
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Abstract
The application relates to the technical field of centrifugal fans, and discloses a volute for a centrifugal fan, which comprises a volute top plate, a volute surrounding plate and a volute bottom plate, wherein the volute surrounding plate is connected between the volute top plate and the volute bottom plate, and the peripheral molded lines of the cross section of the volute surrounding plate comprise a logarithmic spiral diffusion molded line, a logarithmic spiral molded line, a volute tongue molded line and a volute tongue diffusion molded line which are sequentially and smoothly connected in an anticlockwise order; the line type of the logarithmic spiral diffusion type line is a straight line, the line type of the logarithmic spiral type line is a gradually-expanding spiral type line, the line type of the volute tongue type line is a curve, and the line type of the volute tongue diffusion type line is a straight line. The air has better flowing characteristic in the volute, the efficiency is improved, and the noise is reduced.
Description
Technical Field
The application relates to the technical field of centrifugal fans, for example to a volute for a centrifugal fan, a centrifugal fan for a range hood and a range hood.
Background
At present, the range hood is an important electrical appliance in a modern household kitchen, and the air volume, the air pressure and the noise level of the range hood during working influence the use experience of a user on a product, so that the air volume and the air pressure of the range hood during working are improved, and meanwhile, the reduction of the running noise of the range hood is also the direction of research and development of various manufacturers.
The multi-wing centrifugal fan is a main core component of a range hood, and the performance of the multi-wing centrifugal fan directly affects the performance of the range hood. The volute of the traditional centrifugal fan is designed by neglecting the viscosity of flowing gas, meanwhile, the gas is supposed to uniformly flow out along the whole centrifugal impeller outlet, and then the outlet area of the volute is obtained through calculation.
SUMMERY OF THE UTILITY MODEL
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a volute for a centrifugal fan, which is used for partially solving the technical problem that the existing volute generates obvious noise in the operation process.
In some embodiments, the volute for the centrifugal fan comprises a volute top plate, a volute enclosing plate and a volute bottom plate, wherein the volute enclosing plate is connected between the volute top plate and the volute bottom plate, and the peripheral molded lines of the cross section of the volute enclosing plate comprise a logarithmic spiral diffusion molded line, a logarithmic spiral molded line, a volute tongue molded line and a volute tongue diffusion molded line which are sequentially and smoothly connected in an anticlockwise sequence; the line type of the logarithmic spiral diffusion type line is a straight line, the line type of the logarithmic spiral type line is a gradually-expanding spiral type line, the line type of the volute tongue type line is a curve, and the line type of the volute tongue diffusion type line is a straight line.
The volute for the centrifugal fan provided by the embodiment of the disclosure can realize the following technical effects: the utility model provides an adaptation flowing gas that the cross-section periphery molded lines of spiral case bounding wall can be fine has this characteristic of viscidity, and the cross-section periphery molded lines of spiral case bounding wall adopts smooth connection's logarithm spiral diffusion molded lines, logarithm spiral molded lines, volute tongue molded lines and volute tongue diffusion molded lines, therefore centrifugal fan operation in-process, obvious vortex can not appear in the spiral case, has reduced the noise.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
fig. 1 is a schematic structural diagram of a volute for a centrifugal fan according to an embodiment of the present disclosure;
fig. 2 is a schematic cross-sectional view of a volute for a centrifugal fan according to an embodiment of the disclosure;
fig. 3 is a schematic view of a volute shroud cross-sectional outer peripheral profile of a volute for a centrifugal fan according to an embodiment of the present disclosure.
Reference numerals:
1: a logarithmic spiral diffusion profile; 2: logarithmic spiral profile; 3: a volute tongue profile; 4: a volute tongue spreading profile; 5: a centrifugal impeller; 10: an air outlet; 11: a volute top plate; 12: a volute casing coaming; 13: a volute bottom plate.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
As shown in fig. 1 and 2, according to an aspect of the present invention, there is provided a volute for a centrifugal fan, including a volute top plate 11, a volute surrounding plate 12 and a volute bottom plate 13, wherein the volute surrounding plate 12 is connected between the volute top plate 11 and the volute bottom plate 13, and a cross-section peripheral profile of the volute surrounding plate 12 includes a logarithmic spiral diffusion profile 1, a logarithmic spiral profile 2, a volute tongue profile 3 and a volute tongue diffusion profile 4 which are smoothly connected in an anticlockwise order; the logarithmic spiral type line 1 is a straight line, the logarithmic spiral type line 2 is a gradually-expanding spiral type line, the volute tongue type line 3 is a curve, and the volute tongue type line 4 is a straight line.
The volute top plate 11 and the volute bottom plate 13 are oppositely arranged, and the volute enclosing plate 12 is connected along the peripheries of the volute top plate 11 and the volute bottom plate 13 to form the air inlet 10. The corresponding positions of the volute top plate 11 and the volute bottom plate 13 are provided with air inlets, preferably, the air inlets are circular and matched with the centrifugal impeller 5 in shape, and the air inlet pressure loss is reduced.
The volute top plate 11, the volute enclosing plate 12 and the volute bottom plate 13 can be connected in a welding mode, and the method is simple and reliable. The volute top plate 11, the volute bottom plate 13 and the volute enclosing plate 12 are correspondingly reserved with flange edges and through holes, and the flange edges and the through holes are connected together through bolts.
As shown in fig. 3, in some embodiments, the first end a of the logarithmic spiral profile 1 is the outlet of the volute, and the second end b2 is connected to and tangent to the first end b1 of the logarithmic spiral profile 2; the second end c2 of the logarithmic spiral profile 2 is connected and tangent to the first end c1 of the volute tongue profile 3; the second end d2 of the volute tongue molded line 3 is connected and tangent with the first end d1 of the volute tongue spreading molded line 4; the second end e of the volute tongue spreading profile 4 is a volute outlet. All parts of the section peripheral molded line of the volute shroud plate 12 are connected in a tangent mode, smooth transition is achieved, resistance of air in the flowing process is reduced, and efficiency of the centrifugal fan is improved.
In some embodiments, the opening angle a of the logarithmic spiral-shaped diffuser profile 1 is related to the kinetic viscosity of the flowing gas in the volute, the design flow rate of the volute, the width of the volute and the circumferential speed of the outlet of the centrifugal impeller 5. The opening angle a of the logarithmic spiral diffusion profile 1 is the distance between the first end b2 of the logarithmic spiral diffusion profile 1 and the center of the cross section of the volute, minus the radius R of the centrifugal impeller 5. Therefore, obvious vortex can not appear in the volute, and the running noise of the centrifugal fan is reduced.
In some embodiments, the greater the dynamic viscosity of the flowing gas in the volute, the greater the opening angle a of the logarithmic spiral-shaped diffusion profile 1; the larger the design flow of the volute is, the larger the opening angle A of the logarithmic spiral diffusion profile 1 is; the larger the width of the volute is, the smaller the opening angle A of the logarithmic spiral diffusion profile 1 is; the larger the circumferential speed of the centrifugal impeller 5 outlet, the smaller the opening angle a of the logarithmic spiral diffusion profile 1. Therefore, obvious vortex can not appear in the volute, and the running noise of the centrifugal fan is reduced.
Optionally, the opening angle a of the logarithmic spiral diffuser profile 1 and the dynamic viscosity of the gas flowing in the volute, the design flow rate of the volute, the width of the volute, and the circumferential speed of the outlet of the centrifugal impeller 5 satisfy the following relations:
Further, the value range of alpha is 5.7 x 10^4-5.9 x 10^ 4. Therefore, obvious vortex can not appear in the volute, and the running noise of the centrifugal fan is reduced.
In some embodiments, the logarithmic spiral-shaped diffusion profile 1 forms a first included angle θ with the set direction (positive X-axis direction of the center coordinate system of the volute)1Is determined according to the opening angle A of the logarithmic spiral-diffusing profile 1 and the radius R of the centrifugal impeller 5. Therefore, obvious vortex can not appear in the volute, and the running noise of the centrifugal fan is reduced.
In some embodiments, the larger the opening angle a of the logarithmic spiral-diffusion profile 1, the larger the first included angle θ1The larger; the larger the radius R of the centrifugal impeller 5, the larger the first angle θ1The smaller.
Optionally, the first included angle θ1The opening angle A of the logarithmic spiral diffusion profile 1 and the radius R of the centrifugal impeller 5 satisfy the following relations:
wherein λ is1Is a correction factor. Further, λ1The value range of (A) is 1.1-1.3. Therefore, obvious vortex can not appear in the volute, and the running noise of the centrifugal fan is reduced.
In some embodiments, the volute tongue profile 4 forms a second angle θ with the set direction (positive X-axis of the volute center coordinate system)2Is determined according to the opening angle A of the logarithmic spiral-diffusing profile 1 and the radius R of the centrifugal impeller 5. In this way, no significant build-up of the volute interior occursAnd eddy flow reduces the noise of the centrifugal fan.
In some embodiments, the larger the opening angle a of the logarithmic spiral-diffusion profile 1, the larger the second included angle θ2The larger; the larger the radius R of the centrifugal impeller 5, the larger the second angle θ2The smaller.
Optionally, the second included angle θ2The opening angle A of the logarithmic spiral diffusion profile 1 and the radius R of the centrifugal impeller 5 satisfy the following relations:
wherein λ is2Is a correction factor. Further, λ2The value range is 0.82-0.92. Therefore, obvious vortex can not appear in the volute, and the running noise of the centrifugal fan is reduced.
The design process of the section peripheral profile of the volute casing enclosing plate 12 is as follows: establishing a plane Cartesian coordinate system, and drawing a circle with the radius R of the centrifugal impeller 5 as the radius by taking the origin of coordinates as the center of a circle; determining the design flow Q of the volute according to the use condition and the internal space size of the actual productnWidth B of the volute and circumferential speed c of the centrifugal impeller 5 outlet2uObtaining the dynamic viscosity mu of the flowing gas in the volute through experimental test or data query, and substituting the parameters into a formula
In the method, the opening angle A of the logarithmic spiral diffusion molded line 1 is obtained, wherein the value range of α is 5.7 x 10^4-5.9 x 10^4, and the formula is used according to
Calculating an included angle theta formed by the logarithmic spiral diffusion molded line 1 and the X-axis positive direction of the volute center coordinate system1Wherein λ is1The value range of (A) is 1.1-1.3; according to the included angle theta formed by the volute tongue diffusion molded line 4 and the positive direction of the X axis of the volute center coordinate system2And the opening angle A of the logarithmic spiral diffusion molded line 1, determining the connection point of the logarithmic spiral diffusion molded line 1 and the logarithmic spiral molded line 2 and the logarithmic spiral diffusionA loose wire 1; drawing a logarithmic spiral molded line 2 and a volute tongue molded line 3 in sequence; according to the formula
Calculating an included angle theta formed by the volute tongue diffusion molded line 4 and the X-axis positive direction of a coordinate system of the center of the volute2Wherein λ is2The value range is 0.82-0.92, and the volute tongue diffusion molded line 4 can be determined because the volute tongue diffusion molded line 4 is a straight line and is tangent to the volute tongue molded line 3. At this point, four parts of the peripheral profile of the section of the volute casing enclosing plate 12 are all determined and are sequentially connected in a tangent mode to obtain the peripheral profile of the section of the volute casing enclosing plate 12.
According to another aspect of the present invention, there is provided a centrifugal fan comprising the volute described above and a centrifugal impeller 5 disposed within the volute. Preferably, the axis of the centrifugal impeller 5 coincides with the axis of the low noise volute.
According to another aspect of the present invention, a range hood is provided, which comprises the above centrifugal fan.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Portions and features of some embodiments may be included in or substituted for those of others. Each embodiment may be described with emphasis on differences from other embodiments, and like parts may be referred to each other between the respective embodiments. As used in this application, although the terms "first," "second," etc. may be used in this application to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, unless the meaning of the description changes, so long as all occurrences of the first element are renamed consistently and all occurrences of the second element are renamed consistently. The first and second elements are both elements, but may not be the same element.
Claims (10)
1. A volute for a centrifugal fan comprises a volute top plate, a volute enclosing plate and a volute bottom plate, wherein the volute enclosing plate is connected between the volute top plate and the volute bottom plate;
the line type of the logarithmic spiral diffusion type line is a straight line, the line type of the logarithmic spiral type line is a gradually-expanding spiral type line, the line type of the volute tongue type line is a curve, and the line type of the volute tongue diffusion type line is a straight line.
2. The spiral casing of claim 1,
the first end of the logarithmic spiral diffusion molded line is an outlet of the volute, and the second end of the logarithmic spiral diffusion molded line is connected and tangent with the first end of the logarithmic spiral molded line;
the second end of the logarithmic spiral profile is connected and tangent with the first end of the volute tongue profile;
the second end of the volute tongue molded line is connected and tangent with the first end of the volute tongue diffusion molded line;
and the second end of the volute tongue diffusion molded line is a volute outlet.
3. The spiral casing of claim 1 or 2 wherein the opening angle a of the logarithmic spiral diffusion profile is related to the kinetic viscosity of the flowing gas in the spiral casing, the design flow rate of the spiral casing, the width of the spiral casing and the circumferential velocity of the centrifugal impeller outlet.
4. The spiral casing of claim 3,
the larger the dynamic viscosity of the flowing gas in the volute is, the larger the opening angle A of the logarithmic spiral diffusion profile is;
the larger the design flow of the volute is, the larger the opening angle A of the logarithmic spiral diffusion profile is;
the larger the width of the volute is, the smaller the opening angle A of the logarithmic spiral diffusion profile is;
the larger the circumferential speed of the centrifugal impeller outlet is, the smaller the opening angle A of the logarithmic spiral diffusion profile is.
5. The spiral casing of claim 1 or 2 wherein the logarithmic spiral divergence profile forms a first angle θ with the positive X-axis of the center coordinate system of the spiral casing1Is determined according to the opening angle A of the logarithmic spiral diffusion profile and the radius R of the centrifugal impeller.
6. The spiral casing of claim 5,
the larger the opening angle A of the logarithmic spiral diffusion profile is, the larger the first included angle theta is1The larger;
the larger the radius R of the centrifugal impeller is, the larger the first included angle theta1The smaller.
7. The spiral casing of claim 1 or 2 wherein the second included angle θ formed by the volute tongue divergent profile and the positive direction of the X-axis of the center coordinate system of the spiral casing2Is determined according to the opening angle A of the logarithmic spiral diffusion profile and the radius R of the centrifugal impeller.
8. The spiral casing of claim 7,
the larger the opening angle A of the logarithmic spiral diffusion profile is, the larger the second included angle theta is2The larger;
the larger the radius R of the centrifugal impeller is, the larger the second included angle theta is2The smaller.
9. A centrifugal fan for a range hood, comprising a volute according to any one of claims 1 to 8, and a centrifugal impeller disposed within the volute.
10. A range hood comprising the centrifugal fan of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922218499.4U CN211623819U (en) | 2019-12-11 | 2019-12-11 | Volute for centrifugal fan, centrifugal fan and range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922218499.4U CN211623819U (en) | 2019-12-11 | 2019-12-11 | Volute for centrifugal fan, centrifugal fan and range hood |
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| Publication Number | Publication Date |
|---|---|
| CN211623819U true CN211623819U (en) | 2020-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922218499.4U Active CN211623819U (en) | 2019-12-11 | 2019-12-11 | Volute for centrifugal fan, centrifugal fan and range hood |
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| Country | Link |
|---|---|
| CN (1) | CN211623819U (en) |
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