CN113323914A - Centrifugal fan and air conditioner - Google Patents

Centrifugal fan and air conditioner Download PDF

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Publication number
CN113323914A
CN113323914A CN202110775199.5A CN202110775199A CN113323914A CN 113323914 A CN113323914 A CN 113323914A CN 202110775199 A CN202110775199 A CN 202110775199A CN 113323914 A CN113323914 A CN 113323914A
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China
Prior art keywords
centrifugal fan
profile
volute
molded line
fan blade
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CN202110775199.5A
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Chinese (zh)
Inventor
陈帆
汤雁翔
刘司轶
邹先平
李亚冲
陈红
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN202110775199.5A priority Critical patent/CN113323914A/en
Publication of CN113323914A publication Critical patent/CN113323914A/en
Pending legal-status Critical Current

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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
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention provides a centrifugal fan and an air conditioner, wherein the centrifugal fan comprises a centrifugal fan blade and a volute used for accommodating the centrifugal fan blade, the volute projects on any radial surface of the centrifugal fan blade along the axial direction of the centrifugal fan blade, the volute is provided with a circumferential volute at least comprising a first molded line and a second molded line, the molded line radius of the circumferential volute is smaller and smaller along the direction from the first molded line to the second molded line under the same spiral involute angle phi, the airflow flow of the centrifugal fan blade corresponding to the area where the first molded line is located is larger than the airflow flow of the centrifugal fan blade corresponding to the area where the second molded line is located, and phi is more than or equal to 40 degrees and less than or equal to 360 degrees. According to the invention, the volute is provided with a plurality of volute molded lines which are arranged between the first molded line and the second molded line in the axial direction and have smaller and smaller molded line radiuses, and the first molded line and the second molded line are respectively matched with the airflow flow of the centrifugal fan blade, so that the defect of low efficiency caused by mismatching of the volute molded lines and the fan blade flow in the prior art can be effectively overcome.

Description

Centrifugal fan and air conditioner
Technical Field
The invention belongs to the technical field of air conditioning, and particularly relates to a centrifugal fan and an air conditioner.
Background
According to the design theory of the volute of the fan and the constant moment of momentum principle, the volute molded line of the fan is a logarithmic spiral line with the equation of
Figure BDA0003154543150000011
When the diameter R of the fan2Design flow q and circumferential speed c of fan blade outlet2uAnd after the width B of the volute is determined, the R of the volute molded lines at different phi angles is also determined, and the three-dimensional volute is generated by simply stretching according to the molded lines. This volute design method is based on the assumption: in the volute, airflow is uniformly distributed, the flow of each section of the fan blade is the same, however, in the actual operation process of the fan blade, the flow of each section of the fan blade is not consistent, the change form of the flow of each section of the fan blade is gradually increased from a wind collector (an airflow inlet) to a blade middle disc (for example, a radial surface corresponding to the axial midpoint of the fan blade in a double-inlet centrifugal fan (i.e., a blade end disc at the axially central position) and a blade end disc corresponding to the single-inlet centrifugal fan farthest from an inlet), and the flow of each section of the fan blade is highest near the blade middle disc, so that the profile of an original volute is not matched with the actual operation condition, and the operation efficiency of the fan is reduced.
Disclosure of Invention
Therefore, the invention provides a centrifugal fan and an air conditioner, which can overcome the defects that the molded line of a volute in the related technology is single, and the running efficiency of the fan is not high due to the fact that the molded line is not matched with the flow in the actual running working condition of a fan blade.
In order to solve the above problems, the present invention provides a centrifugal fan, including a centrifugal fan blade and a volute for accommodating the centrifugal fan blade, wherein the volute projects on any radial surface of the centrifugal fan blade along an axial direction of the centrifugal fan blade, the volute has a circumferential volute at least including a first profile and a second profile, and under a same spiral involute angle phi, a profile radius of the circumferential volute is gradually smaller along a direction from the first profile to the second profile, an airflow rate of the centrifugal fan blade corresponding to a region where the first profile is located is greater than an airflow rate of the centrifugal fan blade corresponding to a region where the second profile is located, and phi is greater than or equal to 40 degrees and less than or equal to 360 degrees.
Preferably, at the spiral involute angle phi, the profile radius corresponding to the first profile is Ra，
Figure BDA0003154543150000012
Wherein R is2The diameter of the centrifugal fan blade is m; e is the natural logarithm, q is the design flow of the centrifugal fan, and the unit is m3/s；c2uThe outlet circumferential speed of the centrifugal fan blade is in m/s; and B is the axial width of the volute and is expressed by m.
Preferably, at the same spiral involute angle phi as the first profile, the profile radius corresponding to the first profile is Rb，
Figure BDA0003154543150000021
Preferably, the radial direction of the centrifugal fan blade is a radial direction of the centrifugal fan blade, the circumferential volute further comprises a third molded line, the third molded line is located between the first molded line and the second molded line, and the molded line radius corresponding to the third molded line is R under the same spiral involute angle phi with the first molded linec，
Figure BDA0003154543150000022
Preferably, centrifugal fan is single import centrifugal fan, the spiral case have with the first axle end plate that the first axle end disc of centrifugal fan blade corresponds and with the second axle end plate that the second axle end disc of centrifugal fan blade corresponds, do between first axle end plate and the second axle end plate circumference spiral case, be constructed first import on the first axle end plate, the second profile is close to first import setting just first profile is close to the second axle end plate setting.
Preferably, in the axial direction of the centrifugal fan, an axial distance between a radial cross section where the first profile is located and a radial cross section where the second profile is located is b, an axial distance between a radial cross section where the first profile is located and a radial cross section where the third profile is located is b1, and b1 is (0.4-0.6) b.
Preferably, centrifugal fan is two import centrifugal fan, the spiral case have with the first axle end plate that the first axle end disc of centrifugal fan blade corresponds and with the second axle end plate that the second axle end disc of centrifugal fan blade corresponds, do between first axle end plate and the second axle end plate circumference spiral case, be constructed first import on the first axle end plate, be constructed the second import on the second axle end plate, first axle end plate with the second axle end plate is about first radial plane symmetry, the second type line has two, two the second type line about first type line symmetry sets up.
Preferably, in an axial region of the centrifugal fan between the first profile and the first axial end plate, an axial distance between a radial cross section where the first profile is located and a radial cross section where the second profile is located is b, an axial distance between a radial cross section where the first profile is located and a radial cross section where the third profile is located is b1, and b1 is (0.4-0.6) b.
The invention also provides an air conditioner which comprises the centrifugal fan.
According to the centrifugal fan and the air conditioner, the volute is provided with the plurality of volute molded lines which are arranged between the first molded line and the second molded line in the axial direction and have smaller and smaller molded line radiuses, and the first molded line and the second molded line are respectively matched with the airflow flow of the centrifugal fan blade, so that the defect of low efficiency caused by mismatching of the volute molded lines and the fan blade flow in the prior art can be effectively overcome.
Drawings
Fig. 1 is a schematic perspective view of a centrifugal fan according to an embodiment of the present invention;
FIG. 2 is a schematic structural view (isometric view) of the volute of FIG. 1;
FIG. 3 is an axial cross-sectional structural schematic view (partial) of the volute of FIG. 2;
fig. 4 is a schematic view of an axial projection of the volute of fig. 2.
The reference numerals are represented as:
1. a volute; 11. a first axial end plate; 111. a first inlet; 12. a second axial end plate; 121. a second inlet; 13. a circumferential volute; 131. a first profile; 132. a second profile; 133. a third profile; 134. an outlet; 2. and (4) centrifugal fan blades.
Detailed Description
With reference to fig. 1 to 4, according to an embodiment of the present invention, a centrifugal fan is provided, including a centrifugal fan blade 2 and a volute 1 for accommodating the centrifugal fan blade 2, where the volute 1 has a first axial end plate 11 corresponding to a first axial end disc of the centrifugal fan blade 2 and a second axial end plate 12 corresponding to a second axial end disc of the centrifugal fan blade 2, the first axial end plate 11 and the second axial end plate 12 are parallel and have a circumferential volute 13 therebetween, and the circumferential volute 13 is projected on any radial surface of the centrifugal fan blade 2 along an axial direction of the centrifugal fan blade 2, the circumferential volute 13 of the volute 1 at least includes a first profile 131 and a second profile 132 (as shown in fig. 4), and at a same spiral involute angle phi, a profile radius of the circumferential volute 13 is smaller and smaller along a direction from the first profile 131 to the second profile 132, the airflow rate of the centrifugal fan blade 2 corresponding to the area where the first molded line 131 is located is greater than the airflow rate of the centrifugal fan blade 2 corresponding to the area where the second molded line 132 is located, wherein 40 ° ≦ Φ ≦ 360 °, and it can be understood that the area of the circumferential volute 13 corresponding to 0 ° ≦ Φ ≦ 40 ° is the area where the outlet 134 of the centrifugal fan is located, and the starting position of the spiral involute angle Φ may be defined by referring to the orientation shown in fig. 4, specifically, the projection of the axis of the centrifugal fan blade 2 on any one of the radial planes is the coordinate origin O, the straight line parallel to the lip projection line of the projection of the mouth portion of the outlet 134 on any one of the radial planes and passing through the O point is the X axis (the positive direction is toward the airflow outlet side), the straight line passing through the O point and perpendicular to the X axis is the Y axis (the positive direction is toward the airflow outlet side), thus, a defined coordinate system of the first profile 131 and the second profile 132 is constructed, and Φ is an included angle between a connecting line between a point on the first profile 131 and the second profile 132 and the point O and the X axis, and this part of the common general knowledge about Φ is not further described. In the technical scheme, the volute is different from the volute in the prior art in an axial single molded line, the volute in the invention is provided with a plurality of volute molded lines which are arranged between the first molded line 131 and the second molded line 132 and have smaller and smaller molded line radiuses in the axial direction, and the first molded line 131 and the second molded line 132 are respectively matched with the airflow flow of the centrifugal fan blade 2, so that the defect of low efficiency caused by mismatching of the volute molded lines and the fan blade flow in the prior art can be effectively overcome.
In some embodiments, the first profile 131 corresponds to a profile radius R at a spiral involute angle phia，
Figure BDA0003154543150000041
Wherein R is2The diameter of the centrifugal fan blade 2 is m; e is the natural logarithm, q is the design flow of the centrifugal fan, and the unit is m3/s；c2uThe outlet circumferential speed of the centrifugal fan blade 2 is in m/s; b is the axial width of the volute 1, the unit is m, and it needs to be explained that the fan efficiency can be ensured to be in a higher level by taking the coefficient of q in the formula of 1.1-1.3 through simulation verification. Further, at the same spiral involute angle phi as the first profile 131, the profile radius corresponding to the first profile 131 is Rb，
Figure BDA0003154543150000042
It should be noted that, through simulation verification, the coefficient of q in the formula is 0.7-0.9, which can ensure that the efficiency of the fan is at a higher level. It should be noted that the first molded line 131 is arranged corresponding to the position where the flow rate of the centrifugal fan blade 2 is maximum, and the second molded line 132 is arranged corresponding to the position where the flow rate of the centrifugal fan blade 2 is minimum, at this time, correspondingly, on the same axial cross section of the circumferential volute 13, the position of the first molded line 131 is highAt the position of the second profile 132. Further, the circumferential volute 13 further includes a third profile 133, the third profile 133 is located between the first profile 131 and the second profile 132, and a profile radius corresponding to the third profile 133 is R under a same spiral involute angle Φ as the first profile 131, where the third profile 133 is projected on any radial surface of the centrifugal fan 2 along the axial direction of the centrifugal fan 2c，
Figure BDA0003154543150000043
That is, at this time, on the same axial cross section of the circumferential volute 13, the position of the first profile 131 is the highest, the position of the second profile 132 is the lowest, and the position of the third profile 133 is between the positions of the first profile 131 and the second profile 132, it should be noted that, through simulation verification, the coefficient of q in the foregoing formula is 1-1.05, which can ensure that the fan efficiency is at a higher level.
The first profile 131 to the second profile 132 may be, for example, a linear gradual connection relationship extending along the axial direction of the circumferential volute 13, and preferably, a smooth curve gradual connection relationship is provided between the two, so that the circumferential volute 13 can be more matched with the axial flow of the centrifugal fan blade 2. When the third mold line 133 is further included, the first mold line 131, the third mold line 133, and the second mold line 132 are also connected in a smooth curve.
In one embodiment, the centrifugal fan is a single-inlet centrifugal fan, when the first axial end plate 11 is configured with the first inlet 111, the second profile 132 is disposed adjacent to the first inlet 111, and the first profile 131 is disposed adjacent to the second axial end plate 12, that is, when the profile radius of the circumferential volute 13 is smaller and smaller along the axial direction thereof from the second axial end plate 12 to the first axial end plate 11. It should be noted that, for the single-inlet centrifugal fan, the first molded line 131 is disposed at a position corresponding to an inner axial end disc of the centrifugal fan blade 2 (which is also disposed corresponding to the second axial end plate 12), and the fan blade airflow flow rate is maximum here, and the second molded line 132 is disposed at a position corresponding to an outer axial end disc of the centrifugal fan blade 2 adjacent to the first inlet 111, and the fan blade airflow flow rate is minimum here.
Correspondingly, in the axial direction of the centrifugal fan, the axial distance between the radial section a where the first molded line 131 is located and the radial section B where the second molded line 132 is located is B, the axial distance between the radial section a where the first molded line 131 is located and the radial section C where the third molded line 133 is located is B1, and B1 is (0.4-0.6) B, so that the flow velocity at the corresponding position is closer to the flow velocity generated when the fan is designed for flow. .
In another embodiment, the centrifugal fan is a dual-inlet centrifugal fan, the first axial end plate 11 is configured with a first inlet 111, the second axial end plate 12 is configured with a second inlet 121, the first axial end plate 11 and the second axial end plate 12 are symmetrical about a first radial plane, the second profile 132 has two second profiles 132, the two second profiles 132 are symmetrically arranged about the first profile 131, and it is understood that the first profile 131 is on the first radial plane, the third profile 133 also has two third profiles 133, and the two third profiles 133 are respectively located between the first profile 131 and the second profile 132 and are symmetrical about the first profile 131. It should be noted that, for the double-inlet centrifugal fan, the first molded line 131 is arranged at a position corresponding to a central axial end disc of the centrifugal fan blade 2 (which is an end disc at a middle position of the axial length of the centrifugal fan blade 2 and is also called a blade middle disc), where the fan blade airflow flow rate is maximum, and the second molded line 132 is arranged at a position corresponding to side axial end discs of the centrifugal fan blade 2 adjacent to the first inlet 111 and the second inlet 121, respectively, where the fan blade airflow flow rate is minimum.
In an axial region of the centrifugal fan between the first profile 131 and the first axial end plate 11, an axial distance between a radial section a where the first profile 131 is located and a radial section B where the second profile 132 is located is B, an axial distance between a radial section a where the first profile 131 is located and a radial section C where the third profile 133 is located is B1, and B1 is (0.4-0.6) B.
According to an embodiment of the present invention, there is also provided an air conditioner, including a centrifugal fan, where the centrifugal fan is the centrifugal fan described above.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (9)

1. The centrifugal fan comprises a centrifugal fan blade (2) and a volute (1) used for accommodating the centrifugal fan blade (2), and is characterized in that the centrifugal fan blade (2) is axially projected on any radial surface of the centrifugal fan blade (2), the volute (1) is provided with a circumferential volute (13) at least comprising a first molded line (131) and a second molded line (132), the molded line radius of the circumferential volute (13) is smaller and smaller along the direction from the first molded line (131) to the second molded line (132) under the same spiral involute angle phi, the airflow rate of the centrifugal fan blade (2) corresponding to the area where the first molded line (131) is located is larger than the airflow rate of the centrifugal fan blade (2) corresponding to the area where the second molded line (132) is located, and the phi is more than or equal to 40 degrees and less than or equal to 360 degrees.
2. The centrifugal fan according to claim 1, wherein the first profile (131) corresponds to a profile radius R at a screw involute angle Φa，
Figure FDA0003154543140000011
Wherein R is2The diameter of the centrifugal fan blade (2) is m; e is the natural logarithm, q is the design flow of the centrifugal fan, and the unit is m3/s；c2uFor the centrifugal windThe outlet circumferential speed of the blade (2) is m/s; b is the axial width of the volute (1) and the unit is m.
3. The centrifugal fan according to claim 2, wherein the first profile (131) corresponds to a profile radius R at the same helical involute angle Φ as the first profile (131)b，
Figure FDA0003154543140000012
4. The centrifugal fan according to claim 3, wherein the circumferential volute (13) further comprises a third profile (133) projected on any radial surface of the centrifugal fan (2) along the axial direction of the centrifugal fan (2), the third profile (133) is located between the first profile (131) and the second profile (132), and a profile radius corresponding to the third profile (133) is R at a same spiral involute angle phi as the first profile (131)c，
Figure FDA0003154543140000013
5. The centrifugal fan according to claim 4, wherein the centrifugal fan is a single-inlet centrifugal fan, the volute (1) has a first shaft end plate (11) corresponding to a first shaft end disc of the centrifugal fan blade (2) and a second shaft end plate (12) corresponding to a second shaft end disc of the centrifugal fan blade (2), the circumferential volute (13) is arranged between the first shaft end plate (11) and the second shaft end plate (12), the first shaft end plate (11) is provided with a first inlet (111), the second molded line (132) is arranged adjacent to the first inlet (111) and the first molded line (131) is arranged adjacent to the second shaft end plate (12).
6. The centrifugal fan according to claim 5, wherein, in the axial direction of the centrifugal fan, an axial distance between a radial section where the first profile line (131) is located and a radial section where the second profile line (132) is located is b, an axial distance between a radial section where the first profile line (131) is located and a radial section where the third profile line (133) is located is b1, and b1 is (0.4-0.6) b.
7. The centrifugal fan according to claim 4, wherein the centrifugal fan is a dual-inlet centrifugal fan, the volute (1) has a first axial end plate (11) corresponding to a first axial end disc of the centrifugal fan blade (2) and a second axial end plate (12) corresponding to a second axial end disc of the centrifugal fan blade (2), the circumferential volute (13) is arranged between the first axial end plate (11) and the second axial end plate (12), the first axial end plate (11) is provided with a first inlet (111), the second axial end plate (12) is provided with a second inlet (121), the first axial end plate (11) and the second axial end plate (12) are symmetrical with respect to a first radial plane, the second molded line (132) has two, and the two second molded lines (132) are symmetrically arranged with respect to the first molded line (131).
8. The centrifugal fan according to claim 7, wherein in an axial region of the centrifugal fan between the first profile (131) and the first axial end plate (11), an axial distance between a radial section where the first profile (131) is located and a radial section where the second profile (132) is located is b, an axial distance between a radial section where the first profile (131) is located and a radial section where the third profile (133) is located is b1, and b1 is (0.4-0.6) b.
9. An air conditioner characterized by comprising a centrifugal fan as claimed in any one of claims 1 to 8.
CN202110775199.5A 2021-07-08 2021-07-08 Centrifugal fan and air conditioner Pending CN113323914A (en)

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Application Number Priority Date Filing Date Title
CN202110775199.5A CN113323914A (en) 2021-07-08 2021-07-08 Centrifugal fan and air conditioner

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114234286A (en) * 2021-12-10 2022-03-25 珠海格力电器股份有限公司 Air conditioner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114234286A (en) * 2021-12-10 2022-03-25 珠海格力电器股份有限公司 Air conditioner

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