CN106523434B - Centrifugal fan volute and indoor unit - Google Patents
Centrifugal fan volute and indoor unit Download PDFInfo
- Publication number
- CN106523434B CN106523434B CN201611036320.8A CN201611036320A CN106523434B CN 106523434 B CN106523434 B CN 106523434B CN 201611036320 A CN201611036320 A CN 201611036320A CN 106523434 B CN106523434 B CN 106523434B
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- Prior art keywords
- volute
- air outlet
- heat exchanger
- centrifugal fan
- constant
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
- F04D29/5826—Cooling at least part of the working fluid in a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
Abstract
The invention discloses a centrifugal fan volute which is arranged in a shell of an indoor unit, wherein an air inlet and an air outlet are arranged on the shell, a heat exchanger is arranged in the shell and between the volute and the air outlet, an air outlet extending structure is arranged at the air outlet of the volute, and the air outlet extending structure is positioned on an extension line of a molded line of the volute. The volute and the indoor unit of the centrifugal fan have the advantages of small backflow area, high fan efficiency and low noise; the air is ensured to be accurately blown to the effective area of the heat exchanger, the air flow is reduced, and the heat exchange efficiency of the heat exchanger is improved.
Description
Technical Field
The invention belongs to the technical field of volutes, and particularly relates to a volute of a centrifugal fan and an indoor unit adopting the volute.
Background
The design of traditional centrifugal fan spiral case, the wind that blows out from the spiral case air outlet disperses greatly, leads to blowing to the amount of wind of heat exchanger and reduces the heat exchange efficiency of heat exchanger.
Disclosure of Invention
The invention provides a centrifugal fan volute which reduces wind dispersion.
In order to solve the technical problems, the invention adopts the following technical scheme:
a centrifugal fan volute is installed in an indoor unit shell, an air inlet and an air outlet are formed in the shell, a heat exchanger is arranged in the shell and between the volute and the air outlet, an air outlet extending structure is arranged at the position of the air outlet of the volute, and the air outlet extending structure is located on an extension line of a molded line of the volute.
Furthermore, the length of the air outlet extending structure on the extension line of the volute tongue type line
Wherein a is a constant, W is the width of the heat exchanger, and theta is the included angle between the heat exchanger and the bottom surface of the shell.
Still further, the volute tongue radius of the volute is R ═ bRsin theta, wherein b is a constant, R is the radius of the centrifugal fan, and theta is the included angle between the heat exchanger and the bottom surface of the shell.
Furthermore, the volute has a vane gap δ t ═ cRcos θ, where c is a constant, R is the radius of the centrifugal fan, and θ is the angle between the heat exchanger and the bottom surface of the casing.
Furthermore, the end part of the air outlet extending structure is provided with an installation part, and the installation part is fixedly connected with the shell.
Still further, the distance between the projection of the air outlet extending structure on the horizontal plane and the projection of the heat exchanger on the horizontal plane is greater than or equal to 0.
Preferably, the value range of the constant a is 0.5-0.7.
Preferably, the value range of the constant b is 0.2-0.25.
Preferably, the value range of the constant c is 0.2-0.25.
The invention also provides an indoor unit, which comprises the centrifugal fan volute, wherein the volute is arranged in the indoor unit shell, an air inlet and an air outlet are arranged on the shell, a heat exchanger is arranged in the shell and between the volute and the air outlet, an air outlet extending structure is arranged at the air outlet of the volute, and the air outlet extending structure is positioned on the extension line of the molded line of the volute.
Compared with the prior art, the invention has the advantages and positive effects that: the volute and the indoor unit of the centrifugal fan have the advantages of small backflow area, high fan efficiency and low noise; the air is ensured to be accurately blown to the effective area of the heat exchanger, the air flow is reduced, and the heat exchange efficiency of the heat exchanger is improved.
Other features and advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention when taken in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a schematic structural view of an indoor unit according to the present invention;
FIG. 2 is a schematic diagram of the volute of FIG. 1;
FIG. 3 is a schematic structural view of the outlet extension structure of FIG. 2;
FIG. 4 is a comparison of the volute of FIG. 2 with a prior art volute;
FIG. 5 is an enlarged view of a portion of FIG. 4;
fig. 6 is a graph showing the relationship between the air volume and the noise of the scroll casing in fig. 2.
Reference numerals:
1. a housing; 1-1, an air inlet; 1-2, an air outlet; 2. a partition plate; 3. a volute; 3-1, snail tongue;
4. a centrifugal fan; 5. a heat exchanger; 6. an air outlet extending structure; 6-1, mounting part; v, volute space.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The indoor unit of the embodiment mainly comprises a casing 1, wherein the casing 1 comprises an upper casing and a lower casing, an air inlet 1-1 and an air outlet 1-2 are arranged on the casing 1, a centrifugal fan and a heat exchanger 5 are arranged in the casing 1, the centrifugal fan is arranged on one side close to the air inlet 1-1, the heat exchanger 5 is arranged on one side close to the air outlet 1-2, and the centrifugal fan comprises a centrifugal fan 4 and a volute 3, as shown in fig. 1.
In order to fix the volute 3 conveniently, a partition plate 2 is arranged in the shell 1, the partition plate 2 is located between the volute 3 and the heat exchanger 5, and the volute 3 is fixed on the partition plate 2 through a mounting plate at an air outlet of the volute.
The existing volute is small in inner space, in order to reduce the pressure difference between the inside and the outside of the volute and prolong the induced air length, an air outlet extending structure 6 is arranged at the position of an air outlet of the volute, the air outlet extending structure 6 is located on an extension line of a volute molded line P, the fact that air is accurately blown to an effective area of a heat exchanger is guaranteed, the air scattering is reduced, the air quantity is increased, the heat exchange efficiency of the heat exchanger is improved, and the heat exchange capacity of the heat exchanger is guaranteed, and the volute is shown in figures 2 and 3.
The air outlet extending structure 6 is in butt joint with the volute air outlet, and air in the volute space V is blown out through the volute air outlet and the air outlet extending structure 6.
The end of the air outlet extending structure 6 is provided with a mounting part 6-1, and the mounting part 6-1 is fixed on the partition board 2, so that the air outlet extending structure 6 is fixedly connected with the shell 1.
In this embodiment, the length of the outlet extension structure 6 on the extension line of the volute tongue profile P-1
Wherein a is a constant and W isThe width of the heat exchanger, theta, is the angle between the heat exchanger and the bottom surface of the shell (theta can be called the inclination angle of the heat exchanger).
The influence of the width W of the heat exchanger and the inclination angle theta of the heat exchanger is comprehensively considered by the value of the length L of the air outlet extension structure, so that the designed air outlet extension structure reduces the pressure difference inside and outside the volute and prolongs the induced air length, the air is accurately blown to the effective area of the heat exchanger, and the heat exchange efficiency of the heat exchanger is improved.
In this embodiment, the value of the constant a ranges from 0.5 to 0.7. The air outlet extending structure designed by the constant a in the range has large air output and high heat exchange efficiency of the heat exchanger.
The distance between the projection of the air outlet extending structure 6 on the horizontal plane and the projection of the heat exchanger 5 on the horizontal plane is greater than or equal to 0, the middle lower part of the heat exchanger is prevented from being blown out by the air outlet extending structure 6, and then the reduction of the heat exchange efficiency of the heat exchanger caused by the blowing-out is avoided.
In the present embodiment, the air outlet of the volute 3 is close to the lower housing, the volute 3 has a volute tongue 3-1, the radius of the volute tongue is R ═ bRsin θ, where b is a constant, R is the radius of the centrifugal fan, and θ is the included angle between the heat exchanger and the bottom surface of the housing (θ may be referred to as the heat exchanger inclination angle).
The value of the radius R of the volute tongue comprehensively considers the influence of the radius R of the fan and the inclination angle theta of the heat exchanger, so that the volute reduces noise on the premise of reducing the return loss of air volume.
In this embodiment, the value of the constant b ranges from 0.2 to 0.25. The constant b in the range is adopted, and the radius R of the volute tongue is designed by combining the radius R of the fan and the inclination angle theta of the heat exchanger, so that the low heat exchange efficiency of the heat exchanger caused by the overlarge radius of the volute tongue is avoided, and the air part blown out from the air outlet of the volute casing caused by the overlarge radius of the volute tongue is also prevented from being blown to the upper casing, so that the problems of air quantity reduction, noise increase, turbulence and the like caused by the above are avoided; not only the return loss of the air quantity is reduced, but also the noise is further reduced.
In this embodiment, the radius r of the volute tongue is designed so that the upper and lower limits of the air blown out from the air outlet of the volute casing are exactly matched with the upper end and the lower end of the heat exchanger, and the heat exchange efficiency of the heat exchanger is maximized.
The clearance between the volute tongue 3-1 and the fan blade of the centrifugal fan 4 is called as the volute tongue clearance, backflow can be caused when the volute tongue clearance is too small, the backflow not only causes the efficiency of the fan to be reduced, but also is an important noise source, and therefore the performance of the whole machine is greatly influenced by selecting the proper volute tongue clearance.
Therefore, in order to avoid the reduction of the fan efficiency and further reduce the noise, the volute has a vane gap δ t ═ cRcos θ, where c is a constant, R is the radius of the centrifugal fan, and θ is the angle between the heat exchanger and the bottom surface of the casing.
In this embodiment, the value of the constant c ranges from 0.2 to 0.25. The constant c in the range is adopted, and the air tongue gap designed by combining the radius R of the fan and the inclination angle theta of the heat exchanger is small in backflow area, high in fan efficiency and low in noise.
The volute of the embodiment comprehensively considers the radius R of the centrifugal fan, the length L of the air outlet extension structure, the radius R of the volute tongue, the volute space V, the inclination angle theta of the heat exchanger, the width W of the heat exchanger and other main parameters, and improves the existing volute line type.
Next, referring to fig. 4 and 5, a comparison is made between the scroll casing of the prior art and the scroll casing of the present embodiment. The first scheme is a volute in the prior art, the molded line of the volute is P1, the radius of a volute tongue is r1, the gap of a wind tongue is delta t1, and the backflow area is A1 (shown by the left oblique line shaded area in FIG. 5); the second scheme is the volute of the embodiment, the molded line of the volute is P2, the radius of the volute tongue is r2, the gap of the volute tongue is δ t2, and the backflow area is a2 (shown by the area of right oblique line hatching in fig. 5); as can be seen from FIG. 5, A2 is smaller than A1, the volute of the present embodiment has a small backflow area, and the fan efficiency is improved.
The test is carried out on the same indoor unit, and under the condition of the same air quantity, the noise of the volute of the embodiment is reduced by 4dB compared with the volute of the prior art, and the test is shown in figure 6.
The volute of the embodiment reduces noise on the premise of reducing the return loss of the air volume; the backflow area is small, the efficiency of the fan is high, and the noise is low; the air is ensured to be accurately blown to the effective area of the heat exchanger, the air flow is reduced, and the heat exchange efficiency of the heat exchanger is improved. The indoor unit based on the volute design has the advantages of low noise, high heat exchange efficiency of the heat exchanger, good use experience and strong competitiveness.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (6)
1. The utility model provides a centrifugal fan spiral case, installs in indoor set casing be provided with air intake and air outlet on the casing, be provided with heat exchanger, its characterized in that in the casing, between spiral case and air outlet: an air outlet extending structure is arranged at the air outlet of the volute and is positioned on the extension line of the molded line of the volute;
the length of the air outlet extension structure on the extension line of the volute tongue molded line
Wherein a is a constant, W is the width of the heat exchanger, and theta is an included angle between the heat exchanger and the bottom surface of the shell;
the volute tongue radius of the volute is R ═ bR sin theta, wherein b is a constant, R is the radius of the centrifugal fan, and theta is an included angle between the heat exchanger and the bottom surface of the shell.
2. The spiral casing of claim 1 wherein: the volute has a wind tongue gap delta t ═ cR cos theta, wherein c is a constant, R is the radius of the centrifugal fan, and theta is an included angle between the heat exchanger and the bottom surface of the shell;
the end part of the air outlet extending structure is provided with a mounting part, and the air outlet extending structure is fixedly connected with the shell through the mounting part;
the distance between the projection of the air outlet extending structure on the horizontal plane and the projection of the heat exchanger on the horizontal plane is more than or equal to 0.
3. The spiral casing of claim 1 wherein: the value range of the constant a is 0.5-0.7.
4. The spiral casing of claim 1 wherein: the value range of the constant b is 0.2-0.25.
5. The spiral casing of claim 2 wherein: the value range of the constant c is 0.2-0.25.
6. An indoor unit, characterized in that: comprising a volute according to any of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611036320.8A CN106523434B (en) | 2016-11-23 | 2016-11-23 | Centrifugal fan volute and indoor unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611036320.8A CN106523434B (en) | 2016-11-23 | 2016-11-23 | Centrifugal fan volute and indoor unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106523434A CN106523434A (en) | 2017-03-22 |
| CN106523434B true CN106523434B (en) | 2020-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611036320.8A Active CN106523434B (en) | 2016-11-23 | 2016-11-23 | Centrifugal fan volute and indoor unit |
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| CN (1) | CN106523434B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108592201A (en) * | 2018-05-10 | 2018-09-28 | 青岛海尔空调电子有限公司 | A kind of Novel spider plant falls machine |
| WO2021082328A1 (en) | 2019-10-30 | 2021-05-06 | 广东美的制冷设备有限公司 | Air conditioner indoor unit and air conditioner |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2179924Y (en) * | 1993-12-29 | 1994-10-19 | 广州市环境卫生研究所 | Low-noise centrifugal fan |
| CN102538078A (en) * | 2012-02-29 | 2012-07-04 | 青岛海尔空调电子有限公司 | Air pipe machine indoor machine |
| CN203374522U (en) * | 2013-06-03 | 2014-01-01 | 青岛海尔空调电子有限公司 | Volute and air hose unit |
| CN104566636A (en) * | 2013-10-28 | 2015-04-29 | 珠海格力电器股份有限公司 | Air duct machine and air conditioner provided with air duct machine |
| CN204532964U (en) * | 2015-03-26 | 2015-08-05 | 广东美的暖通设备有限公司 | The spiral case of centrifugal blower, centrifugal blower and air conditioner |
| CN106050700A (en) * | 2016-07-19 | 2016-10-26 | 东莞市宏铭通风设备有限公司 | Noiseless fan structure |
-
2016
- 2016-11-23 CN CN201611036320.8A patent/CN106523434B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2179924Y (en) * | 1993-12-29 | 1994-10-19 | 广州市环境卫生研究所 | Low-noise centrifugal fan |
| CN102538078A (en) * | 2012-02-29 | 2012-07-04 | 青岛海尔空调电子有限公司 | Air pipe machine indoor machine |
| CN203374522U (en) * | 2013-06-03 | 2014-01-01 | 青岛海尔空调电子有限公司 | Volute and air hose unit |
| CN104566636A (en) * | 2013-10-28 | 2015-04-29 | 珠海格力电器股份有限公司 | Air duct machine and air conditioner provided with air duct machine |
| CN204532964U (en) * | 2015-03-26 | 2015-08-05 | 广东美的暖通设备有限公司 | The spiral case of centrifugal blower, centrifugal blower and air conditioner |
| CN106050700A (en) * | 2016-07-19 | 2016-10-26 | 东莞市宏铭通风设备有限公司 | Noiseless fan structure |
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| CN106523434A (en) | 2017-03-22 |
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Effective date of registration: 20201113 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee after: QINGDAO HAIER AIR CONDITIONER ELECTRIC Co.,Ltd. Patentee after: Haier Zhijia Co.,Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR CONDITIONER ELECTRIC Co.,Ltd. |