CN109973438B - Volute of centrifugal fan - Google Patents
Volute of centrifugal fan Download PDFInfo
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- CN109973438B CN109973438B CN201910333585.1A CN201910333585A CN109973438B CN 109973438 B CN109973438 B CN 109973438B CN 201910333585 A CN201910333585 A CN 201910333585A CN 109973438 B CN109973438 B CN 109973438B
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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
- F04D29/422—Discharge tongues
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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
- F04D29/4233—Fan casings with volutes extending mainly in axial or radially inward direction
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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
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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
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
- F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
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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 relates to a volute of a centrifugal fan, which comprises an air outlet and a cavity for accommodating an impeller, wherein a volute tongue protruding inwards the cavity is arranged on the inner wall of the volute at a position close to the air outlet, the molded line of the volute comprises a starting line AP positioned at one end of the molded line and corresponding to the volute tongue and an ending line HG positioned at the other end of the molded line, a first connecting line PD and a second connecting line DG are sequentially arranged between the starting line AP and the ending line HG, the starting point P point of the first connecting line PD is positioned at the volute tongue, the point D of the first connecting line PD is the position of the smallest gap between the inner wall of the volute and the outer circumference of the impeller, the connecting line between the point D and the center O of the impeller is OD, and the second connecting line DG part and the first. Therefore, the distance between the minimum clearance and the volute tongue is changed, the oil fume flows through a large turn when passing through the volute tongue, the oil-gas separation and accumulation caused by the impact of the airflow at the minimum clearance are reduced, and the subsequent oil stain accumulation at the volute tongue is further reduced.
Description
Technical Field
The invention relates to the field of fans, in particular to a volute of a centrifugal fan.
Background
The household range hood uses the centrifugal fan to exhaust the oil-containing air out of the kitchen and discharge the air to a public flue or directly outside the room, wherein the centrifugal fan is widely applied to the range hood due to the advantages of large suction force, low noise, compact structure and the like.
The volute is one of core components of the centrifugal fan, and has the functions of concentrating gas leaving an impeller, guiding the gas to an outlet of the volute and converting dynamic pressure into static pressure. The volute of the existing centrifugal fan comprises a front cover plate, a rear cover plate and a circular wall enclosing plate for connecting the front cover plate and the rear cover plate, wherein the top plate of the volute and the bottom plate of the volute are consistent in all molded lines except for the volute tongue part, the volute tongue is arranged near the volute outlet of the centrifugal fan and is used for shunting gas guided to the outlet of the volute so as to prevent partial gas from circularly flowing in the volute, and the shape and the form of the volute tongue have important influences on the air volume, the air pressure, the efficiency, the noise and the like of the centrifugal fan. The conventional volute design is generally carried out according to a unary theory, and two assumptions are provided, namely that flow parameters on the periphery of an inlet are uniformly distributed, the airflow moment in the volute is constant, and the volute profile designed according to the unary theory is generally an equiangular spiral line. In practice, due to the non-axisymmetric shape of the volute, especially the influence of the volute tongue, a non-uniform pressure field is formed at the impeller outlet, which inevitably makes the impeller outlet, i.e. the volute inlet flow field, non-uniform.
The present applicant previously applied for chinese utility model patent No. CN201720594983.5 (No. CN206957987U) in a centrifugal blower volute, wherein the volute profile further includes a first spiral line CD with an unchangeable expansion angle and a second spiral line EM with a gradually reduced expansion angle, the first spiral line CD is connected to a start line AC, the second spiral line EM is connected to an end line MN, and the front-back width of the ring wall at the outer side of the blower outlet is greater than the front-back width at the inner side, the volute is designed to compensate the flow loss caused by the reduction of the left-right size of the volute by the front-back size of the volute, however, in the actual use environment of the range hood, because the medium is oil fume flow, the oil fume is easily separated when the volute is intercepted, the oil fume is accumulated and flows to the lowest point of the volute, especially, the most obvious oil fume is accumulated and dried after long-term use, solid drops are easily formed at the volute, thereby reducing the clearance between the volute tongue and the impeller, easily causing the noise to be obviously increased and even generating the howling sound; although the common shallow tongue or the concave volute tongue can reduce grease accumulation to a certain extent, the actual gap is also increased, so that the maximum static pressure and the actual flow of a user are reduced.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a volute of a centrifugal fan, which reduces the impact of the airflow at the minimum gap by changing the position of the minimum gap between the impeller and the volute from the volute tongue, thereby achieving the purpose of reducing the oil-gas separation and accumulation, in view of the current situation of the prior art.
The second technical problem to be solved by the present invention is to provide a volute of a centrifugal fan, which reduces the airflow backflow and simultaneously achieves the purpose of reducing the noise.
The third technical problem to be solved by the invention is to provide a volute of a centrifugal fan, which can improve the smoothness of air flow in the volute while keeping the left and right sizes of the volute to be reduced.
The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides a centrifugal fan spiral case, includes air outlet and the cavity that is used for holding the impeller, inner wall of volute has the protruding spiral tongue in to the cavity in neighbouring air outlet department, the molded lines of spiral case are including the initiating line AP that is located molded lines one end and corresponds to spiral tongue position and the ending line HG that is located the molded lines other end, are equipped with first connecting wire PD and second connecting wire DG between initiating line AP and the ending line HG in proper order, its characterized in that: the starting point P point of the first connecting line PD is located at the volute tongue, the point D of the first connecting line PD is the position of the smallest gap between the inner wall of the volute and the outer circumference of the impeller, the connecting line between the point D and the center O of the impeller is OD, and the part of the second connecting line DG is in mirror symmetry with the connecting line OD relative to the first connecting line PD.
Furthermore, an included angle formed by the connecting line OD and a horizontal line passing through the point O on one side adjacent to the air outlet is theta0，θ0∈(90°，170°]. Point O is a fixed point, and point D on the first connecting line PD at the minimum gap is deflected by an angle theta0The design of (3) further changes the position between minimum clearance department and volute tongue department, has passed through big turn from this when oil smoke gas flows through second connecting wire DG, first connecting wire PD and volute tongue department in proper order, further reduces the oil-gas separation and the accumulation that the impact of air current at minimum clearance department leads to, and then reduces the accumulation of follow-up greasy dirt at volute tongue department.
The technical scheme adopted by the invention for solving the second technical problem is as follows: the intersection point of a connecting line OP between the point P and the center O of the impeller and the outer circumference of the impeller is M, the intersection point of a connecting line OD and the outer circumference of the impeller is N, the distance between the point N and the point D is ND, the distance between the point P and the point M is MP, the distance ND is t, and the distance OD is t + R2MP is k x t, ND is less than or equal to MP, and the included angle formed by connecting line OD and the horizontal line passing through O point on the side close to the air outlet is theta0Wherein R is2Is the outer diameter of the impeller, t is the actual design clearance between the volute and the outer circumference of the impeller, t/R2∈[0.02,0.15]，k∈[1,4]. The minimum clearance between the volute and the impeller is related to the separation and collection, t/R, of the outflow air flow of the impeller2When the ratio is less than 0.02, the smaller the relative clearance is, the less the airflow reflows, but the noise is obviously increased and even squeals; and t/R2When the ratio is larger than 0.15, the relative clearance is larger, but the leakage loss is larger as the airflow backflow is more, and a plurality of factors such as noise, leakage, backflow and the like need to be comprehensively considered.
In order to improve the resistance and adapt to the working condition of large flow, the included angle formed between the connecting line OP and the connecting line OD is theta0Omega, wherein omega is an included angle formed by a connecting line OP and a horizontal line passing through the center O of the impeller on one side adjacent to the air outlet, and omega belongs to [40 degrees ], 90 degrees]. The O point of the circle center is a fixed point, the volute tongue is positioned at the air outlet of the volute, when the angle omega is larger than 90 degrees, the effective collection section of the volute is reduced easily due to the overlarge outlet, namely the volute has reduced capacity of collecting airflow, the capacity of converting dynamic pressure of the airflow into static pressure is reduced after the airflow comes out of the impeller, and the resistance of the whole fan system is reduced; if the omega angle is less than 40 degrees, the outlet is easy to be too small, when the airflow collected by the volute is discharged, the flow resistance is increased because the outlet is too small and is intercepted by the volute, and the work under the working condition of large flow cannot be adapted, and the omega angle integrates a plurality of factors such as dynamic and static pressure conversion of the volute, the outlet resistance and the like in the range and the range that the range hood is to be adapted to the working conditions such as high resistance, large flow and the like.
The second connecting line DG may take various forms, and is preferably an equiangular logarithmic spiral with a constant divergence angle in order to improve the fluency of the flow collection and passage inside the volute.
Preferably, the polar radius of the second connecting line DG
Wherein the divergence angle alpha belongs to [3 DEG, 9 DEG ]]，θ0Is the included angle formed by the connecting line OD and the horizontal line passing through the point O on one side close to the air outlet, theta is the polar coordinate angle variable of any point on the second connecting line DG, R2Is outside the impellerAnd (4) diameter.
In order to achieve the purpose of overall noise reduction, the second connection line DG is a variable angle logarithmic spiral with a variable expansion angle. The second connecting line DG adopts a variable-angle spiral line form, and the expansion degree of different angle areas can be controlled more conveniently, so that the dynamic pressure-to-static pressure recovery capacity of the impeller outlet airflow is increased, and the expansion degree change of partial areas is also beneficial to the whole noise reduction.
Preferably, the polar radius of the second connecting line DG
Wherein the variable divergence angle
α1And alpha2Are all belonged to [3 DEG, 9 DEG ]]And α is1≥α2，
The regulation term s ∈ [ -0.5, 0.5]，r∈[-5，5]And r ≠ 1, α1Angle of divergence of D, α2Is the divergence angle of the point G,
for variable helix to envelope angle, theta0Is the included angle formed by the connecting line OD and the horizontal line passing through the point O on one side close to the air outlet, theta is the polar coordinate angle variable of any point on the second connecting line DG, R2Is the outer diameter of the impeller.
The technical scheme adopted by the invention for solving the third technical problem is as follows: the second connecting wire DG comprises a first spiral line DE, a second spiral line FG and a straight line section EF connected with the first spiral line DE and the second spiral line FG, the first spiral line DE is connected with the first connecting wire PD, the E point and the F point of the straight line section EF are respectively positioned on the upper side and the lower side of a horizontal line OJ passing through an impeller center O point, the straight line section EF is perpendicular to the horizontal line OJ, and the first spiral line DE and the first connecting wire PD are in mirror symmetry relative to the connecting wire OD.
In order to reduce the influence of the volute profile on the performance of the centrifugal fan, the straight line segment EThe distance L between the J point on the F and the center O of the impeller and the outer diameter R of the impeller2The relationship of (1) is: L/R2∈[1.1,1.7]. Therefore, the smoothness of airflow collection and passing inside the volute is improved, the maximum static pressure and the static pressure of the effective air volume section are improved, the effect of achieving a large volute under a small size is achieved, and the pneumatic noise is reduced.
Compared with the prior art, the volute of the centrifugal fan has the advantages that the characteristic that a shallow volute tongue or an inward-concave volute tongue is not easy to generate squealing noise due to grease accumulation is kept, the first connecting line PD is obtained by mirror-reversing the part of the second connecting line DG relative to the connecting line OD, the distance from the minimum gap to the volute tongue is changed, oil smoke gas flows through a large turn when sequentially passing through the second connecting line DG, the first connecting line PD and the volute tongue, the oil-gas separation and accumulation caused by the impact of the air flow at the minimum gap are reduced, the subsequent oil stain accumulation at the volute tongue is further reduced, and meanwhile, the static pressure and the efficiency can be improved while the noise is not increased; in addition, the deflection angle theta is formed by the point D at the minimum clearance0The design of the oil-gas separator changes the position between the minimum clearance and the volute tongue, namely, the oil-gas separation and accumulation degree can be further changed by changing the stroke of the oil-gas flow passing through a large turning, so that the accumulation of oil stains at the volute tongue is reduced; and the design of the straight-line segment EF reduces the left and right sizes of the volute, improves the smoothness of airflow collection and passing inside the volute, improves the maximum static pressure and the static pressure of the effective air volume segment, achieves the effect of a large volute under small size, and reduces the pneumatic noise.
Drawings
Fig. 1 is a schematic structural diagram of a volute according to a first embodiment of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a schematic structural diagram of a volute profile according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a volute profile according to a second embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The first embodiment is as follows:
as shown in fig. 1 to 3, a first embodiment of the present invention is shown. The volute of the centrifugal fan for the range hood of the embodiment comprises a front cover plate 11, a rear cover plate 12 and a circular wall surrounding plate 13 connected between the front cover plate 11 and the rear cover plate 12, wherein the front cover plate 11, the rear cover plate 12 and the circular wall surrounding plate 13 are surrounded to form a cavity 1b with an air outlet 1a at the top, the cavity 1b is used for accommodating an impeller, the air outlet 1a is positioned at the top of the volute, a volute tongue 131 protruding into the cavity 1b is arranged on the inner wall of the volute at a position close to the air outlet 1a, the volute tongue 131 is inwards relative to the outer wall of the volute and is a shallow volute tongue or an inwards concave volute tongue, the volute tongue 131 is formed on the circular wall surrounding plate 13, the circular wall surrounding plate 13 is in an integral molded line, the volute tongue 131 is positioned at the starting position of a molded line on the inner wall of the circular wall, the molded line comprises a starting line AP positioned at one end of the molded line corresponding to the volute tongue 131 and an ending line HG positioned, the first connecting line PD is connected with the starting line AP, the second connecting line DG is connected with the first connecting line PD, the starting point P point of the first connecting line PD is located at the position of the volute tongue 131, the P point changes along with the radius of the volute tongue 131 and the position change of the volute tongue 131, the D point of the first connecting line PD is located at the position of the minimum gap between the inner wall of the volute 1 and the outer circumference of the impeller, namely the D point is the position point of the minimum gap, the connecting line between the D point and the fixed point circle center O of the impeller is OD, and the part of the second connecting line DG is in mirror symmetry with the connecting line OD of the first connecting line PD.
The second connection line DG may have an equiangular logarithmic spiral with a constant divergence angle, and a polar radius of the second connection line DG
Wherein the divergence angle alpha belongs to [3 DEG, 9 DEG ]]Theta is the angle variation of polar coordinate at any point on the second connecting line DG, R2Is the outer diameter of the impeller. And in this embodiment, can improve the smoothness that the inside air current of spiral case passes through when keeping the left and right sides size reduction of spiral case, give way the excision to second connecting wire DG, specifically, second connecting wire DG includes first helix DE, second helix FG and connects the straight of first helix DE and second helix FGAnd the line segment EF is connected with the first spiral line DE and the first connecting line PD, and the first spiral line DE and the first connecting line PD are in mirror symmetry relative to the connecting line OD.
In the embodiment, the intersection point of the connecting line OP between the point P and the center O of the impeller and the outer circumference of the impeller is M; the intersection point of the connecting line OD and the outer circumference of the impeller is N, wherein the distance between the N point and the D point is ND, the distance between the P point and the M point is MP, ND is less than or equal to MP, ND is t, OD is t + R2MP is k x t, and the included angle formed by the connecting line OD and the horizontal line passing through the point O on the side close to the air outlet is theta0Wherein R is2Is the outer diameter of the impeller, t is the actual design clearance between the volute and the outer circumference of the impeller, t/R2∈[0.02,0.15]，k∈[1,4]，θ0∈(90°，170°]. In addition, the angle between the connection line OP and the connection line OD is θ0Omega, wherein omega is an included angle formed by a connecting line OP and a horizontal line passing through the center O of the impeller on one side adjacent to the air outlet, and omega belongs to [40 degrees ], 90 degrees]The center of circle O is a fixed point, i.e. the position is not changed. The volute tongue is positioned at a position adjacent to an air outlet of the volute, when the angle omega is larger than 90 degrees, the distance between a point P and the air outlet is increased, namely, an airflow outlet is too large, so that the effective collection section of the volute is easily reduced, namely, the capacity of the volute for collecting airflow is reduced, the capacity of the volute for converting dynamic pressure of the airflow into static pressure after the airflow comes out of the impeller is reduced, and the resistance of the whole fan system is deteriorated; if the omega angle is less than 40 degrees, the outlet is easy to be too small, when the airflow collected by the volute is discharged, the flow resistance is increased because the outlet is too small and is intercepted by the volute, and the work under the working condition of large flow cannot be adapted, and the omega angle integrates a plurality of factors such as dynamic and static pressure conversion of the volute, outlet resistance and the like in the range and the range of the working condition that the range hood is to be adapted to high resistance, large flow and the like.
As shown in fig. 3, points E and F of the straight line segment EF are respectively located at the upper and lower sides of a horizontal line OJ passing through the center O of the impeller, the straight line segment EF is perpendicular to the horizontal line OJ, and a distance L between the point J on the straight line segment EF and the center O of the impeller and the outer diameter R of the impeller2The relationship of (1) is: L/R2∈[1.1,1.7]. The straight line segment EF is perpendicular to the horizontal line OJ, so that the fluency of collection and passing of airflow in the volute is improved, the maximum static pressure and the static pressure of an effective air volume segment are improved, and the realization of the designThe large volute effect is achieved under the small size, and the pneumatic noise is reduced.
Example two:
fig. 4 shows a second embodiment of the present invention. This embodiment differs from the first embodiment only in that: the second connection line DG is a variable angle logarithmic spiral whose expansion angle changes. In particular, the pole radius of the second connection line DG
Wherein the variable divergence angle
α1And alpha2Are all belonged to [3 DEG, 9 DEG ]]And α is1≥α2，
The regulation term s ∈ [ -0.5, 0.5]，r∈[-5，5]And r ≠ 1, α1Angle of divergence of D, α2Is the divergence angle of the point G,
for variable helix to envelope angle, theta0Is the included angle formed by the connecting line OD and the horizontal line passing through the point O on one side close to the air outlet, theta is the polar coordinate angle variable of any point on the second connecting line DG, R2Is the outer diameter of the impeller. The second connecting line DG adopts a variable-angle spiral line, so that the expansion degree of different angle areas can be more conveniently controlled, the dynamic pressure, rotation and static pressure recovery capacity of the airflow at the outlet of the impeller is improved, and the expansion degree change of partial areas is also beneficial to integral noise reduction; in addition, in this embodiment, the second connection line DG is also subjected to abduction and cutting.
Claims (10)
1. The utility model provides a centrifugal fan spiral case, includes air outlet and the cavity that is used for holding the impeller, inner wall of volute has the protruding spiral tongue in to the cavity in neighbouring air outlet department, the molded lines of spiral case are including the initiating line AP that is located molded lines one end and corresponds to spiral tongue position and the ending line HG that is located the molded lines other end, are equipped with first connecting wire PD and second connecting wire DG between initiating line AP and the ending line HG in proper order, its characterized in that: the starting point P point of the first connecting line PD is located at the volute tongue, the point D of the first connecting line PD is the position of the smallest gap between the inner wall of the volute and the outer circumference of the impeller, the connecting line between the point D and the center O of the impeller is OD, and the part of the second connecting line DG is in mirror symmetry with the connecting line OD relative to the first connecting line PD.
2. The centrifugal fan volute of claim 1, wherein: the connecting line OD and the horizontal line passing through the point O form an included angle theta at one side adjacent to the air outlet0，θ0∈(90°，170°]。
3. The centrifugal fan volute of claim 2, wherein: the intersection point of a connecting line OP between the point P and the center O of the impeller and the outer circumference of the impeller is M, the intersection point of a connecting line OD and the outer circumference of the impeller is N, the distance between the point N and the point D is ND, the distance between the point P and the point M is MP, the distance ND is t, and the distance OD is t + R2MP ═ k × t, ND ≦ MP, wherein R2Is the outer diameter of the impeller, t is the actual design clearance between the volute and the outer circumference of the impeller, t/R2∈[0.02,0.15]，k∈[1,4]。
4. The centrifugal fan volute of claim 2, wherein: the angle formed between the connecting line OP and the connecting line OD is theta0Omega, wherein omega is an included angle formed by a connecting line OP and a horizontal line passing through the center O of the impeller on one side adjacent to the air outlet, and omega belongs to [40 degrees ], 90 degrees]。
5. The centrifugal fan volute of any of claims 1 to 4, wherein: the second connection line DG is an equiangular logarithmic spiral having a constant divergence angle.
6. The centrifugal fan volute of claim 5, wherein: the polar radius of the second connecting line DG
Wherein, theta0Is an included angle formed by the connecting line OD and a horizontal line passing through the point O on one side adjacent to the air outlet, and the expansion angle alpha belongs to [3 degrees ], 9 degrees]Theta is the angle variation of polar coordinate at any point on the second connecting line DG, R2Is the outer diameter of the impeller.
7. The centrifugal fan volute of any of claims 1 to 4, wherein: the second connection line DG is a variable angle logarithmic spiral whose expansion angle changes.
8. The centrifugal fan volute of claim 7, wherein: the polar radius of the second connecting line DG
Wherein the variable divergence angle
α1And alpha2Are all belonged to [3 DEG, 9 DEG ]]And α is1≥α2，
The regulation term s ∈ [ -0.5, 0.5]，r∈[-5，5]And r ≠ 1, α1Angle of divergence of D, α2Is the divergence angle of the point G,
for variable helix to envelope angle, theta0Is the included angle formed by the connecting line OD and the horizontal line passing through the point O on one side close to the air outlet, theta is the polar coordinate angle variable of any point on the second connecting line DG, R2Is the outer diameter of the impeller.
9. The centrifugal fan volute of any of claims 1 to 4, wherein: the second connecting wire DG comprises a first spiral line DE, a second spiral line FG and a straight line section EF connected with the first spiral line DE and the second spiral line FG, the first spiral line DE is connected with the first connecting wire PD, the E point and the F point of the straight line section EF are respectively positioned on the upper side and the lower side of a horizontal line OJ passing through an impeller center O point, the straight line section EF is perpendicular to the horizontal line OJ, and the first spiral line DE and the first connecting wire PD are in mirror symmetry relative to the connecting wire OD.
10. The centrifugal fan volute of claim 9, wherein: the distance L between the J point on the straight line section EF and the circle center O of the impeller and the outer diameter R of the impeller2The relationship of (1) is: L/R2∈[1.1,1.7]。
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| CN110374934A (en) * | 2019-08-02 | 2019-10-25 | 马鞍山宸宇达风机工业有限公司 | The installation method of blower volute tongue |
| CN110425157B (en) * | 2019-09-04 | 2023-12-15 | 宁波纽新克电机有限公司 | Efficient gas mixing centrifugal fan |
| EP4050221A4 (en) * | 2020-01-19 | 2022-12-21 | GD Midea Environment Appliances MFG Co., Ltd. | Centrifugal fan and air supply device |
| CN113137386B (en) * | 2020-01-19 | 2024-04-05 | 广东美的环境电器制造有限公司 | Air supply device |
| CN112628974B (en) * | 2020-12-07 | 2021-11-30 | 珠海格力电器股份有限公司 | Air conditioner control method, system, medium, equipment, air supply device and application |
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