CN109681469B - Volute structure of centrifugal fan - Google Patents
Volute structure of centrifugal fan Download PDFInfo
- Publication number
- CN109681469B CN109681469B CN201710968617.6A CN201710968617A CN109681469B CN 109681469 B CN109681469 B CN 109681469B CN 201710968617 A CN201710968617 A CN 201710968617A CN 109681469 B CN109681469 B CN 109681469B
- Authority
- CN
- China
- Prior art keywords
- air inlet
- segment
- center
- degrees
- inlet hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000007704 transition Effects 0.000 claims abstract description 16
- 238000005452 bending Methods 0.000 claims description 6
- 238000012937 correction Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model provides a centrifugal fan spiral case structure, includes front bezel (1), backplate (3) and rampart bounding wall (2), aforementioned rampart bounding wall (2) will with the torsional surface of continuous smooth transition front bezel (1) and backplate (3) are connected to the upper end forms the air outlet, and aforementioned rampart bounding wall (2) are an integral type line, its characterized in that: the integral molded line comprises a starting straight line segment (AB), a volute tongue arc segment (BC), a logarithmic spiral segment (CD), a middle straight line segment (DE), an Archimedes spiral segment (EF), a transition arc segment (GH) and a terminating straight line segment (HK) which are connected in sequence. Compared with the prior art, the method has the advantages of good fluency and obvious noise reduction.
Description
Technical Field
The application relates to a centrifugal fan, in particular to a volute of the centrifugal fan, which is mainly applied to a range hood.
Background
Centrifugal fans are widely used in range hoods due to their advantages of large suction force, low noise, compact structure, and the like. The volute is one of the core components of the centrifugal fan, and serves to concentrate the gas leaving the impeller, guide the gas out to the outlet of the volute, and convert dynamic pressure into static pressure. The volute structure of the existing centrifugal fan comprises a volute top plate, a volute bottom plate and a volute coaming connected with the volute top plate and the volute bottom plate, wherein the volute top plate and the volute bottom plate are identical in other molded lines except for volute tongue positions. Conventional volute designs are generally based on a unitary theory, and there are two assumptions that the flow parameters are uniformly distributed around the inlet circumference and the moment of airflow in the volute is unchanged, and the volute line designed according to a unitary theory is generally an equiangular spiral. However, in practice, due to the non-axisymmetric shape of the volute, particularly the influence of the volute tongue, a non-uniform pressure field is formed at the impeller outlet, which inevitably results in non-uniform flow field at the impeller outlet, i.e. at the volute inlet. The non-uniformity of the inlet circumferential flow parameters and the influence of the flow field in the circumferential plane of the volute are not considered in the unitary theory, so that the volute designed according to the theory has poor performance, and the deterioration is more obvious particularly in a high back pressure working state. In addition, install the volute tongue near centrifugal fan spiral case export, the effect of volute tongue is shunted the gas that leads the spiral case export, prevents that partial gas from circulating flow in the spiral case, and shape and the form of volute tongue all have important influence to centrifugal fan amount of wind, wind pressure, efficiency and noise.
The prior art also discloses various volute structures of centrifugal fans, such as a centrifugal fan for a range hood and a volute molded line generating method thereof, which are disclosed in Chinese patent publication No. ZL 201110118687.5 (issued publication No. CN 102182707B), wherein the volute comprises a volute top plate, a volute bottom plate and a volute coaming, the contour line of the inner side molded surface of the volute coaming is a volute molded line, and the volute molded line is formed by smoothly and transitionally connecting a first straight line DE, a first circular arc EF, a second circular arc FG, a spiral GH and a second straight line HI.
The inventor has made many researches in this respect, see China patent with patent number ZL200610050640.9 for fan volute Structure of European style range hood capable of double-sided air intake (issued notice number CN 100371645C); chinese application patent No. ZL201510530944.4, "a centrifugal fan volute" (grant bulletin No. CN 105041722B); reference may also be made to the chinese patent No. zl2015155055. X, entitled "centrifugal fan volute" (issued publication No. CN 104847699B), which refers to an optimized design of the annular wall or cover plate that forms the volute, to improve the smoothness, thereby reducing the resistance and noise.
Disclosure of Invention
The application aims to solve the technical problem of providing a centrifugal fan volute structure capable of reducing noise in fluency.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a centrifugal fan spiral case structure, includes front bezel, backplate and rampart bounding wall, preceding fresh air inlet has been seted up at the middle part of aforementioned front bezel, back fresh air inlet has been seted up at the middle part of aforementioned backplate, aforementioned rampart bounding wall will with the torsional surface of continuous smooth transition front bezel and backplate link together to the upper end forms the air outlet, and aforementioned rampart bounding wall is an integral type line, and this integral type line initiating terminal corresponds to the volute tongue position, and the termination end is adjacent the air outlet, its characterized in that: the integral molded line comprises a starting straight line segment, a volute tongue arc segment, a logarithmic spiral segment, a middle straight line segment, an Archimedes spiral segment, a transition arc segment and a terminating straight line segment which are connected in sequence, and the starting straight line segment is connected with the volute tongue arc segment, the volute tongue arc segment is connected with the logarithmic spiral segment, the Archimedes spiral segment is connected with the transition arc segment, and the transition arc segment is connected with the terminating straight line segment in a cutting mode.
The front air inlet hole is circular, the length of the initial straight line section is smaller than or equal to the radius of the front air inlet hole, and the included angle alpha between the extension line of the initial straight line section and the horizontal direction is smaller than or equal to 45 degrees and smaller than or equal to 90 degrees.
The initial point of the logarithmic spiral line segment and the circle center connecting line of the forward air hole form an initial connecting line, and the initial connecting line and a horizontal line passing through the circle center of the forward air hole are intersected to form an included angle phi 1, so that 50 degrees-phi 1-85 degrees are met;
the termination point of the logarithmic spiral line segment and the circle center connecting line of the forward air hole form a termination connecting line, and the termination connecting line and a horizontal line passing through the circle center of the forward air hole are intersected to form an included angle phi 2, so that 160 degrees-phi 2-180 degrees are satisfied;
the distance between each point on the logarithmic spiral line segment and the connecting line of the circle center of the forward air inlet is R1, and the condition that R1=r×e is satisfied (s1-x)Φ Wherein r is the radius of the forward air inlet, s1 is a constant, and x is a correction coefficient which is more than 0 and less than or equal to 0.15 and is related to impeller parameters and rated flow; multiple R1 values can be obtained by adopting different x values under different angles phi, spline curve transition fitting is used for forming an approximate logarithmic spiral line segment, and each point x value is sequentially x 1 、x 2 ……x n-1 、x n Satisfy the relation x n ＝ax n-1 The value of a is in the range of 1-1.2, and phi is an included angle formed by intersecting a connecting line from each point on the logarithmic spiral segment to the center of the air inlet hole and a horizontal line passing through the center of the air inlet hole.
Further, the intersection of the middle straight line segment and a horizontal line passing through the center of the air inlet hole is 90 degrees, and an included angle phi 3 is formed by the intersection of a connecting line from the termination point of the middle straight line segment to the center of the air inlet hole and the horizontal line passing through the center of the air inlet hole, so that 180 degrees < phi 3 is less than or equal to 210 degrees.
Further, the Archimedes spiral line segment adopts a modified Archimedes spiral line equation to meet the formula R2 = R + R (s 2-t) phi 4, wherein s2 is a constant, related to impeller parameters and rated flow, t is a modified value, a plurality of R2 values can be obtained by adopting different t values under different angles phi 4, and the Archimedes spiral line segment is approximately fitted by using a spline curve, phi 4 is an included angle formed by intersecting a connecting line from each point on the Archimedes spiral line segment to the center of an air inlet hole with a horizontal line passing through the center of the air inlet hole, the angle phi 4 = 360 DEG corresponding to the ending point of the Archimedes spiral line segment, and each point t value is t in turn 1 、t 2 ……t n-1 、t n Satisfy the relation t n ＝bt n-1 The value of b is in the range of 1-1.2, and t is more than 0 and less than or equal to 0.2.
Further, an included angle phi 5 is formed by intersecting a connecting line from the end point of the arc curve end to the center of the front air inlet and a horizontal line passing through the center of the front air inlet, and the angle phi 5 is less than or equal to 390 degrees and is 360 degrees.
Further, the end point of the end straight line segment is flush with the start point of the start straight line segment, and an included angle phi 6 is formed by intersecting a connecting line from the end point of the end straight line segment to the center of the front air inlet hole and a horizontal line passing through the center of the front air inlet hole, so that phi 6 is more than or equal to 75 degrees and less than or equal to 90 degrees.
Further, the projection of the circle center of the front air inlet hole on the plane of the backboard coincides with the circle center of the rear air inlet hole, and the radius of the front air inlet hole is equal to the radius of the rear air inlet hole.
Further, the lower end of the front plate is connected with the surrounding wall coaming after being bent, and the bending angle is 15-75 degrees.
Further, the lower end of the backboard is connected with the surrounding wall coaming after being bent, and the bending angle is 15-75 degrees.
Further, the lower end of the surrounding wall coaming plate is provided with an oil leakage hole.
Further, the front plate is provided with a guide ring around the front air inlet, and the radius of the guide ring is equal to the radius of the rear air inlet.
Compared with the prior art, the application has the advantages that: the annular wall coaming adopts three line types of designs of an optimized logarithmic spiral line, an Archimedes spiral line and a straight line, is reasonably matched, increases a straight line section, and makes smaller volute width on the premise of affecting the flow field in the volute as little as possible, so that the integral line of the annular wall coaming can more accord with the flowing track of air flow, thereby reducing noise and pressure loss and improving air quantity.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1.
Fig. 2 is a schematic view of the volute structure in fig. 1.
Fig. 3 is an exploded view of fig. 2.
Fig. 4 is a plan view of the front plate of fig. 2.
Fig. 5 is a plan view of the peripheral wall panel of fig. 2.
Fig. 6 is a drawing of the label of fig. 4.
Fig. 7 is a drawing showing the front plate in example 2.
Fig. 8 is a drawing showing the front plate in example 3.
Fig. 9 is a drawing showing the front plate in the comparative example.
Detailed Description
The application is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1, the centrifugal fan in the present embodiment includes a volute 10, a wind wheel 6 disposed in the volute 10, and a motor 7 for driving the wind wheel 6 to rotate.
As shown in fig. 2 and 3, the volute 10 includes a front plate 1, a back plate 3, and a surrounding wall board 2, where a front air inlet 11 is provided in the middle of the front plate 1, a rear air inlet 31 is provided in the middle of the back plate 3, the surrounding wall board 2 connects the front plate 1 and the back plate 3 with continuously and smoothly transiting twisted surfaces, an air outlet is formed at the upper end, a connecting flange 5 is provided on the air outlet, the surrounding wall board 2 is an integral molded line, the initial end of the integral molded line corresponds to the volute tongue part, and the termination end is adjacent to the air outlet.
The projection of the center of the front air inlet 11 on the plane of the backboard 3 coincides with the center of the rear air inlet 31, and the radius of the front air inlet 11 is equal to the radius of the rear air inlet 31. The lower end of the front plate 1 is connected with the surrounding wall coaming plate 2 after being bent, and the bending angle is 15-75 degrees. The lower end of the backboard 3 is connected with the surrounding wall coaming 2 after being bent, and the bending angle is 15-75 degrees. The lower end of the surrounding wall coaming plate 2 is provided with an oil leakage hole 21. The front plate 1 is provided with a deflector ring 4 around the front air inlet 11, the radius of the deflector ring 4 being equal to the radius of the rear air inlet 31.
Referring to fig. 4, the integral profile of the annular wall coaming 2 sequentially includes a start straight line segment AB, a spiral tongue arc segment BC, a logarithmic spiral segment CD, a middle straight line segment DE, an archimedes spiral segment EF, a transition arc segment GH and a stop straight line segment HK, and the start straight line segment AB and the spiral tongue arc segment BC, the spiral tongue arc segment BC and the logarithmic spiral segment CD, the archimedes spiral segment EF and the transition arc segment GH, and the transition arc segment GH and the stop straight line segment HK are all cut and connected.
The connecting line of the circle centers of the point-advancing air holes 11 on the integral type line forms a connecting line which is intersected with the horizontal line passing through the circle centers of the front air holes 11 to form an included angle phi. The connecting line R is formed by connecting the centers of the air inlet holes 11 at the points on the integral type line.
The length of the initial straight line segment AB is smaller than or equal to the radius of the front air inlet hole 11, and the included angle alpha between the extension line of the initial straight line segment AB and the horizontal direction is more than or equal to 45 degrees and less than or equal to 90 degrees.
Starting point of logarithmic spiral segment CD, satisfies 50 DEG-85 DEG;
the end point of the logarithmic spiral segment CD satisfies 160 DEG-phi-180 DEG;
each point on the logarithmic spiral segment CD satisfies r=r×e (s1-x)Φ Wherein r is the radius of the forward air inlet 11, s1 is a constant, and x is a correction coefficient which is more than 0 and less than or equal to 0.15 and is related to impeller parameters and rated flow;multiple R values can be obtained by adopting different x values under different angles phi, spline curve transition fitting is used for forming an approximate logarithmic spiral segment CD, and each point x value is sequentially x 1 、x 2 ……x n-1 、x n Satisfy the relation x n ＝ax n-1 The value of a is in the range of 1 to 1.2,
the intersection of the middle straight line segment DE and a horizontal line passing through the center of the front air inlet hole 11 forms 90 degrees, and the termination point of the middle straight line segment DE meets 180 degrees < phi 3 less than or equal to 210 degrees.
The Archimedes spiral line segment EF adopts a modified Archimedes spiral line equation to satisfy the formula R2=r+r (s 2-t) phi 4, wherein t is a correction value, a plurality of R values can be obtained by adopting different t values under different angles phi, spline curves are fitted into the approximate Archimedes spiral line segment EF, phi is an included angle formed by intersecting a connecting line from each point on the Archimedes spiral line segment EF to the center of the front air inlet 11 with a horizontal line passing through the center of the front air inlet 11, the angle phi=360 DEG corresponding to the ending point of the Archimedes spiral line segment EF, and the t values of each point are sequentially t 1 、t 2 ……t n-1 、t n Satisfy the relation t n ＝bt n-1 The value of b is in the range of 1-1.2, and t is more than 0 and less than or equal to 0.2.
The end termination point of the arc curve meets 360 degrees < phi less than or equal to 390 degrees.
The end point of the end straight line segment HK is flush with the start point of the start straight line segment AB, and the end point of the end straight line segment HK is more than or equal to 75 degrees and less than or equal to 90 degrees.
In the embodiment, the overall width of the volute is 312mm, the thickness of the volute is 172mm, and the volute is used for European-style range hoods.
As shown in fig. 5 and 6, the points of the overall molded line of the surrounding wall coaming are as follows:
| angle of | Radius mm | Angle of | Radius mm | Angle of | Radius mm | Angle of | Radius mm |
| -27° | 115.88 | 60° | 130.76 | 170° | 153.60 | 260° | 175.22 |
| -20° | 116.78 | 70° | 132.67 | 180° | 155.86 | 270° | 177.78 |
| -10° | 118.23 | 75° | 133.62 | 190° | 158.16 | 280° | 180.43 |
| 0° | 119.75 | 114° | 141.55 | 200° | 160.49 | 286° | 182.12 |
| 10° | 121.54 | 120° | 142.76 | 210° | 162.85 | ||
| 20° | 123.31 | 130° | 144.87 | 220° | 165.25 | ||
| 30° | 125.13 | 140° | 147.00 | 230° | 167.70 | ||
| 40° | 127.00 | 150° | 149.17 | 240° | 170.16 | ||
| 50° | 128.87 | 160° | 151.37 | 250° | 172.67 |
In example 2, the overall width of the volute is 312mm and the thickness is 172mm, and the volute is used for European-style range hoods. The overall profile of the surrounding wall coaming meets the requirement that the length unit is mm as shown in figure 7. Other structures refer to embodiment 1.
Example 3, the overall width of the volute in this example was 312mm and the thickness was 172mm, for use in a range hood. The integral profile of the surrounding wall coaming meets the requirement that the length unit is mm as shown in figure 8. Other structures refer to embodiment 1.
In comparative example, the design of the prior patent (ZL 200610050640.9) of the inventor is adopted in the example, and the integral molded line of the surrounding wall coaming meets the requirement of the integral molded line of the surrounding wall coaming, as shown in fig. 9, and the unit of length is mm. Other structures refer to embodiment 1.
With the same impeller and motor, the following test data were obtained, see table below.
| Case (B) | Maximum air volume m 3 /min | Noise dB | Maximum static pressure Pa | Full pressure efficiency% |
| Original scheme | 14.5 | 55.8 | 298 | 27.4 |
| Example 1 | 15.2 | 54.5 | 346 | 27 |
| Example 2 | 14.8 | 54.8 | 352 | 27.5 |
| Example 3 | 15.4 | 55.4 | 330 | 27.2 |
Therefore, the air quantity and the maximum static pressure are obviously improved, the noise is obviously reduced, and the integral molded line of the surrounding wall coaming plate can be more in line with the flowing track of the air flow.
Claims (10)
1. The utility model provides a centrifugal fan spiral case structure, includes front bezel (1), backplate (3) and rampart bounding wall (2), preceding fresh air inlet (11) have been seted up at the middle part of aforementioned front bezel (1), back fresh air inlet (31) have been seted up at the middle part of aforementioned backplate (3), aforementioned rampart bounding wall (2) will with the torsional surface of continuous smooth transition front bezel (1) and backplate (3) link together to the upper end forms the air outlet, and aforementioned rampart bounding wall (2) are an integral molded lines, and this integral molded lines starting end corresponds the volute tongue position, and the terminating end is adjacent the air outlet, its characterized in that: the integral molded line comprises a starting straight line segment (AB), a volute tongue arc segment (BC), a logarithmic spiral segment (CD), a middle straight line segment (DE), an Archimedes spiral segment (EF), a transition arc segment (GH) and a termination straight line segment (HK) which are connected in sequence, and the starting straight line segment (AB) is connected with the volute tongue arc segment (BC), the volute tongue arc segment (BC) is connected with the logarithmic spiral segment (CD), the Archimedes spiral segment (EF) is connected with the transition arc segment (GH), and the transition arc segment (GH) is connected with the termination straight line segment (HK) in a cutting mode;
the initial point of the logarithmic spiral line segment (CD) and the circle center connecting line of the front air inlet hole (11) form an initial connecting line, and the initial connecting line and a horizontal line passing through the circle center of the front air inlet hole (11) are intersected to form an included angle phi 1, so that the angle phi 1 is more than or equal to 50 degrees and less than or equal to 85 degrees;
the termination point of the logarithmic spiral line segment (CD) and the circle center connecting line of the front air inlet hole (11) form a termination connecting line, and the termination connecting line and a horizontal line passing through the circle center of the front air inlet hole (11) are intersected to form an included angle phi 2, so that 160 degrees-phi 2-180 degrees are met;
the distance between each point on the logarithmic spiral line segment (CD) and the connecting line of the center of the front air inlet (11) is R1, and the requirements of R1=r×e are met (s1-x)Φ Wherein r is the radius of the forward air inlet hole (11), s1 is a constant, and x is a correction coefficient which is more than 0 and less than or equal to 0.15 and is related to impeller parameters and rated flow; multiple R1 values can be obtained by adopting different x values under different angles phi, spline curve transition fitting is used for forming an approximate logarithmic spiral segment (CD), and each point x value is sequentially x 1 、x 2 ……x n-1 、x n Satisfy the relation x n ＝ax n-1 The value of a is in the range of 1-1.2, and phi is an included angle formed by intersecting a connecting line from each point on the logarithmic spiral segment (CD) to the center of the front air inlet (11) and a horizontal line passing through the center of the front air inlet (11);
the lower end of the front plate (1) is connected with the surrounding wall coaming (2) after being bent, and the bending angle is 15-75 degrees.
2. Centrifugal fan volute structure according to claim 1, characterized in that the forward air inlet (11) is circular, the length of the initial straight line segment (AB) is smaller than or equal to the radius of the forward air inlet (11), and the angle α between the extension line of the initial straight line segment (AB) and the horizontal direction is 45 ° - α -90 °.
3. The centrifugal fan volute structure according to claim 1, characterized in that the intersection of the middle straight line segment (DE) and a horizontal line passing through the center of the front air inlet hole (11) is 90 degrees, and an included angle phi 3 is formed by the intersection of a connecting line from the termination point of the middle straight line segment (DE) to the center of the front air inlet hole (11) and the horizontal line passing through the center of the front air inlet hole (11), so that 180 degrees < phi 3 degrees are less than or equal to 210 degrees.
4. A centrifugal fan volute structure according to claim 3, characterized in that the archimedes spiral line segment (EF) uses a modified archimedes spiral line equation, satisfying the formula r2=r+r (s 2-t) Φ4, where s2 is a constant, related to the impeller parameters and the rated flow, t is a correction value, multiple R2 values are obtained at different angles Φ4 using different t values, and is fitted to an approximation by spline curvesThe phi 4 is an angle formed by intersecting a connecting line from each point on the Archimedes spiral line segment (EF) to the center of the front air inlet (11) and a horizontal line passing through the center of the front air inlet (11), the angle phi 4 corresponding to the ending point of the Archimedes spiral line segment (EF) is=360 DEG, and the t values of each point are t in sequence 1 、t 2 ……t n-1 、t n Satisfy the relation t n ＝bt n-1 The value of b is in the range of 1-1.2, and t is more than 0 and less than or equal to 0.2.
5. A centrifugal fan volute structure according to claim 3, characterized in that the angle phi 5 formed by the intersection of the connecting line from the end point of the arc curve end to the center of the front air inlet hole (11) and the horizontal line passing through the center of the front air inlet hole (11) satisfies 360 ° < phi 5 < 390 °.
6. The centrifugal fan volute structure according to claim 5, characterized in that the ending point of the ending straight line segment (HK) is flush with the starting point of the starting straight line segment (AB), and an included angle phi 6 is formed by intersecting a connecting line from the ending point of the ending straight line segment (HK) to the center of the front air inlet hole (11) and a horizontal line passing through the center of the front air inlet hole (11), so that phi 6 is more than or equal to 75 degrees and less than or equal to 90 degrees.
7. The centrifugal fan volute structure according to claim 1, characterized in that the projection of the center of the front air inlet hole (11) on the plane of the back plate (3) coincides with the center of the rear air inlet hole (31), and the radius of the front air inlet hole (11) is equal to the radius of the rear air inlet hole (31).
8. The centrifugal fan volute structure according to claim 1, characterized in that the lower end of the back plate (3) is connected with the annular wall coaming (2) after being bent, and the bending angle is 15-75 degrees.
9. The centrifugal fan volute structure according to claim 1, characterized in that the lower end of the annular wall coaming (2) is provided with an oil leakage hole (21).
10. Centrifugal fan volute structure according to claim 1, characterized in that the front plate (1) is provided with a deflector ring (4) around the forward air inlet opening (11), the radius of the deflector ring (4) being equal to the radius of the rear air inlet opening (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710968617.6A CN109681469B (en) | 2017-10-18 | 2017-10-18 | Volute structure of centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710968617.6A CN109681469B (en) | 2017-10-18 | 2017-10-18 | Volute structure of centrifugal fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109681469A CN109681469A (en) | 2019-04-26 |
| CN109681469B true CN109681469B (en) | 2023-11-17 |
Family
ID=66183166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710968617.6A Active CN109681469B (en) | 2017-10-18 | 2017-10-18 | Volute structure of centrifugal fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109681469B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110750855B (en) * | 2019-09-06 | 2022-01-07 | 华中科技大学 | Volute molded line design method under shape sizing limitation |
| CN114234286B (en) * | 2021-12-10 | 2023-03-28 | 珠海格力电器股份有限公司 | Air conditioner |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182707A (en) * | 2011-05-09 | 2011-09-14 | 美的集团有限公司 | Centrifugal fan for range hood and volute profile generation method thereof |
| WO2014009103A1 (en) * | 2012-07-13 | 2014-01-16 | Delphi Automotive Systems Luxembourg Sa | Ventilation device equipped with a casing shaped as a volute housing |
| CN104005996A (en) * | 2014-05-13 | 2014-08-27 | 珠海格力电器股份有限公司 | Volute, centrifugal fan volute and range hood |
| CN205173063U (en) * | 2015-11-11 | 2016-04-20 | 中山市樱雪集团有限公司 | Centrifugal fan shell |
-
2017
- 2017-10-18 CN CN201710968617.6A patent/CN109681469B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182707A (en) * | 2011-05-09 | 2011-09-14 | 美的集团有限公司 | Centrifugal fan for range hood and volute profile generation method thereof |
| WO2014009103A1 (en) * | 2012-07-13 | 2014-01-16 | Delphi Automotive Systems Luxembourg Sa | Ventilation device equipped with a casing shaped as a volute housing |
| CN104005996A (en) * | 2014-05-13 | 2014-08-27 | 珠海格力电器股份有限公司 | Volute, centrifugal fan volute and range hood |
| CN205173063U (en) * | 2015-11-11 | 2016-04-20 | 中山市樱雪集团有限公司 | Centrifugal fan shell |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109681469A (en) | 2019-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207261316U (en) | Centrifugal blower volute structure | |
| CN109611356B (en) | Backward centrifugal fan | |
| CN109681469B (en) | Volute structure of centrifugal fan | |
| CN104343732A (en) | Volute tongue structure of fan for range hood | |
| WO2021063050A1 (en) | Fan and axial-flow impeller | |
| CN113175443A (en) | Efficient low-noise three-dimensional flow impeller of backward centrifugal fan without volute | |
| CN2906398Y (en) | Double-side air-sucking type blower fan volute structure of European-type range hood | |
| CN107975497B (en) | Centrifugal fan spiral case | |
| WO2023109295A1 (en) | Impeller, centrifugal fan, and range hood | |
| CN100371645C (en) | Fan volute structure with air inlets on double sides for European-style smoke exhaust ventilator | |
| CN107975496B (en) | Centrifugal fan spiral case | |
| CN210106248U (en) | Volute of centrifugal fan for range hood and centrifugal fan applied by volute | |
| CN110030210B (en) | Volute for centrifugal fan of range hood and centrifugal fan using same | |
| CN110307178B (en) | Low-noise impeller | |
| WO2020082913A1 (en) | Centrifugal fan blade assembly, centrifugal fan, and air conditioner | |
| CN207647597U (en) | A kind of IC. engine cooling fan | |
| CN201606308U (en) | Volute housing of forward multi-wing centrifugal fan | |
| CN109595198B (en) | Fan impeller | |
| US20200408221A1 (en) | Oblique flow fan | |
| WO2021139508A1 (en) | Diffuser, air supply apparatus, and dust collection equipment | |
| CN207920965U (en) | A kind of axial-flow leaf and its axial flow blower of application | |
| CN203671852U (en) | Guide ring, air duct structure and air conditioner indoor cabinet | |
| CN104847699A (en) | Centrifugal fan volute structure | |
| CN204677503U (en) | A kind of centrifugal blower volute structure | |
| CN220522890U (en) | Volute, centrifugal fan and range hood |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |