CN113283031A - Design method of fan system of range hood - Google Patents
Design method of fan system of range hood Download PDFInfo
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- CN113283031A CN113283031A CN202110592671.1A CN202110592671A CN113283031A CN 113283031 A CN113283031 A CN 113283031A CN 202110592671 A CN202110592671 A CN 202110592671A CN 113283031 A CN113283031 A CN 113283031A
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- volute
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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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
- F04D29/26—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
- F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
- F04D29/283—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis rotors of the squirrel-cage type
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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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Abstract
The invention discloses a design method of a fan system of a range hood, wherein the fan system comprises a volute and an impeller arranged in the volute, and the fan system is arranged in a fan frame, and is characterized in that: the method comprises the following steps: 1) setting target parameters of a fan system: flow is Q, full pressure is P and noise; 2) calculating the thickness B of the volute according to the depth B 'of the fan frame, wherein B is (0.56-0.7) B'; simultaneously calculating to obtain the outer diameter D of the impeller2Width S of the volute:
wherein, sigma, omega and zeta are constants, sigma is 1-5, omega is 230-235, zeta is 131 to 134; 3) designing parameters of an impeller; 4) according to the obtained B, D2And impeller parameters, performing volute profile parameter design, comparing with the target parameters set in the step 1), finishing design if the performance meets the requirements, and otherwise, continuously adjusting B and D2And performing iterative optimization until the performance meets the requirement.
Description
Technical Field
The invention relates to an oil fume purification device, in particular to a design method of a fan system of a range hood.
Background
The range hood has become one of the indispensable kitchen household electrical appliances in modern families. The range hood works by utilizing the fluid dynamics principle, sucks and exhausts oil smoke through a centrifugal fan arranged in the range hood, and filters partial grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated in the center of the fan, oil smoke below the range hood is sucked into the fan, accelerated by the fan and then collected and guided by the volute to be discharged out of a room.
The depth of the existing fan system is usually 310mm, in order to meet the requirements of cigarette machine bag cabinets, the range hood is developed towards the thinning direction, the depth of the fan frame is 200-247 mm, and the fan system matched with the fan frame is thinned synchronously. When the fan system is thinned, performance is ensured not to be attenuated, and higher requirements are provided for the design of the thin fan.
The thickness of the multi-wing centrifugal fan system for the existing range hood product is generally 160-180 mm, and the depth of a fan frame matched with the multi-wing centrifugal fan system is deeper. Therefore, there is a high demand for the depth of the cabinet. The design of the prior thin fan system generally directly adopts a cutting mode on the basis of the prior fan system, and the method directly brings loss of air volume and air pressure. And the fan system puts higher requirements on the thickness of the motor after being thinned.
Therefore, there is a need for a blower system that can maintain the air volume and the air pressure unchanged under the premise of reducing the thickness.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a design method of a fan system of a range hood aiming at the defects in the prior art, which can reduce the thickness of the fan system and simultaneously keep the air volume and the air volume not to be pressed.
The technical scheme adopted by the invention for solving the technical problems is as follows: a design method of a fan system of a range hood is provided, the fan system comprises a volute and an impeller arranged in the volute, the fan system is arranged in a fan frame, and the design method is characterized in that: the method comprises the following steps:
1) setting target parameters of a fan system: flow is Q, full pressure is P and noise;
2) calculating the thickness B of the volute according to the depth B 'of the fan frame, wherein B is (0.56-0.7) B'; simultaneously calculating to obtain the outer diameter D of the impeller2Width S of the volute:
wherein sigma, omega and zeta are constants, sigma is 1-5, omega is 230-235, and zeta is 131-134;
3) designing parameters of an impeller;
4) according to the obtained B, D2And impeller parameters, performing volute profile parameter design, comparing with the target parameters set in the step 1), finishing design if the performance meets the requirements, and otherwise, continuously adjusting B and D2And performing iterative optimization until the performance meets the requirement.
Preferably, in step 3), the impeller parameter comprises the inner diameter D of the impeller1：
Calculating the flow coefficient
And coefficient of pressure
Thereby obtaining
u is the impeller exit linear velocity and ρ is the gas density flowing through the fan system.
Preferably, in step 3), the impeller comprises at least two blades arranged at intervals in the circumferential direction, the impeller parameters further comprise the thickness b of the impeller and the inlet angle β of the blades1Outlet angle beta of the blade2Radius r of the blade, the above parameters satisfying: beta is a2＝135°～145°，β1＝45°～70°；b＝B-(15～20)mm；r＝12～17mm。
Preferably, in step 3), the impeller comprises at least two blades arranged at intervals in the circumferential direction, and the impeller parameters comprise the number Z of the blades, wherein Z is 58-63 blades.
Preferably, in step 3), the volute profile includes a first straight line segment, a first curve segment, a second curve segment, a third curve segment and a second straight line segment, which are connected in sequence and are in smooth transition, the line segment corresponds to the volute tongue of the volute, the starting point of the first straight line segment is the starting point of the volute profile, the end point of the second straight line segment is the end point of the volute profile, and a space between the starting point of the first straight line segment and the end point of the second straight line segment corresponds to the air outlet of the volute.
Preferably, step 4) comprises the steps of:
4.1) calculating the opening degree of the volute
Wherein a' is a constant and has a value range of 1-5; e is the base number of the natural number, b is the thickness of the impeller, C2uIs the impeller outlet flow rate;
4.2) determining the starting point and the end point of the second curve segment: radius of origin
Radius of the end point
Wherein a' is a constant and has a value range of 0.95-1.1; r2Is the radius of the impeller;
4.3) selecting radius R ═ of volute tongue3-5 mm; the interval t between the volute tongue and the tongue is (0.03-0.06) D2(ii) a Width of air outlet of volute
Wherein the content of the first and second substances,
the value is constant and ranges from 5 to 8;
4.4) selecting the first curve segment as an equiangular spiral line, wherein the polar coordinate equation of any point of the first curve segment is as follows:
theta is a polar angle variable of any point,
C2uis the impeller outlet flow rate; the second curve segment and the third curve segment are Bezier curves;
and 4.5) continuously adjusting the second curve segment and the third curve segment to perform volute profile optimization verification.
Preferably, θ is 80 ° to 180 °.
Compared with the prior art, the invention has the advantages that: the thickness of the volute and the outer diameter of the impeller of the fan system are calculated according to the depth of the fan frame, and under the frame, the parameters of the fan system are optimized, so that the specific design that the air volume and the air pressure are unchanged can be guaranteed under the condition that the overall thickness is reduced.
Drawings
FIG. 1 is a schematic view (from front to back) of a fan system of an embodiment of the present invention;
FIG. 2 is a schematic view (looking from back to front) of a fan system of an embodiment of the present invention;
FIG. 3 is a cross-sectional side view of a blower system of an embodiment of the present invention positioned in a blower housing (with the motor and its mounting bracket hidden);
FIG. 4 is a cross-sectional elevation view of a blower system of an embodiment of the present invention positioned in a blower chassis (with the motor and its mounting bracket hidden);
FIG. 5 is a schematic view of a volute profile of a fan system according to an embodiment of the invention;
FIG. 6 is a schematic view of a volute and impeller profile of a blower system according to an embodiment of the present invention;
fig. 7 is a schematic view of a profile of an impeller of a fan system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
Referring to fig. 1 and 2, a fan system, which is a centrifugal fan, includes a volute 1, an impeller 2 disposed in the volute 1, and a motor 3 for driving the impeller 2 to rotate, wherein the motor 3 is mounted on the volute 1 through a mounting bracket 4. The volute 1 comprises a first cover plate 11, a second cover plate 12 and a ring wall 13 connected between the first cover plate 11 and the second cover plate 12, and the motor 3 is fixedly connected with a rear cover plate 12 of the volute 1 through a mounting bracket 4. The impeller 2 comprises at least two blades 21 arranged at intervals in the circumferential direction.
The first cover plate 11 is provided with a first air inlet 111, the second cover plate 12 is provided with a second air inlet 121, the first air inlet 111 is used as a main air inlet, and the second air inlet 121 is used as an auxiliary air inlet, so that the fan system is a double-air-inlet fan. The first cover plate 11, the second cover plate 12 and the annular wall 13 together enclose an air outlet 14. Alternatively, the volute 1 may be provided with only one air inlet.
Referring to fig. 3 and 4, the range hood further includes a fan frame 100, and the fan system is disposed in the fan frame 100. In the installation state of the fan system, the first air inlet 111 faces backwards, and the second air inlet 121 faces forwards. Alternatively, the orientations of the first and second intake vents 111 and 121 may be interchanged.
The design method of the fan system comprises the following steps:
1) setting target parameters of a fan system: flow is Q, full pressure is P and noise;
2) calculating the thickness B of the volute 1 of the fan system according to the depth B '(the size in the front-back direction) of the fan frame 100, wherein the thickness of the volute 1 refers to the size in the front-back direction in the installation state shown in fig. 3, namely the size in the axial direction of the fan system, and B is (0.56-0.7) × B'; the diameter (external diameter) D of the impeller is obtained by simultaneous calculation2Width S of the volute:
wherein σ, ω, and ζ are constants, preferably, the value ranges of the three parameters are: sigma is 1-5, omega is 230-235, and zeta is 131-134.
Assuming that a fan system having a width S of 360mm and a thickness B of 140mm is designed, the outer diameter D of the impeller 2 can be obtained by substituting the parameter S, B into the equation (1)2230 mm; under the size frame, the system parameters of the fan are optimized, and the specific design that the air quantity and the air pressure are unchanged can be ensured;
3) calculating parameters of impellerNumber, calculating the inner diameter D of the impeller 21Thickness b of impeller 2, inlet angle β of blade 211Outlet angle beta of blade 212The number Z of blades 21, the radius r of the blades 21 (the blades 21 are circular arc), and impeller parameter modeling, see fig. 5 to 7:
calculating flow coefficient and pressure coefficient according to flow Q and full pressure P
Thereby calculating
u is the linear velocity of the outlet of the impeller 2, and rho is the density of the gas flowing through the fan system; beta is a2＝135°～145°，β1＝45°～70°；b＝B-(15～20)mm，B＝120～140mm；r＝12～17mm，O1The center of the molded line of the blade 21; z is preferably 58-63 sheets;
4) according to the calculated impeller parameters, volute profile parameter design is carried out, referring to fig. 5, the volute profile comprises a first straight line segment which is connected in sequence and is in smooth transition
Line segment
First curve segment
Second curve segment
Third curve segment
And a second straight line segment
A isThe starting point of the volute profile, G is the end point of the volute profile, and the line segment between the starting point and the end point corresponds to the air outlet 14 of the volute
The molded line of the volute tongue can also be a line segment outside the arc corresponding to the volute tongue of the volute; referring to fig. 5 to 7, after the profile design is finished, comparing the profile design with the target parameters set in the step 1), if the performance meets the requirements, finishing the design, otherwise, continuously adjusting B and D2And performing iterative optimization until the performance meets the requirement:
4.1) calculating the opening degree of the volute
Wherein a' is a constant, and preferably, the value range is 1-5; d2Is the outer diameter of the impeller 2, e is the natural number base, Q is the air quantity set by the fan system, b is the thickness of the impeller 2, C2uIs the outlet flow rate of the impeller 2;
4.2) determining the second curve section
Starting point D and end point E positions: radius of origin D
Radius of end point E
Wherein a' is a constant, and preferably, the value range is 0.95-1.1; r2The radius of the impeller 2 (distance from the outlet to the center O, half of the outer diameter);
4.3) the radius R of the volute tongue is 3-5 mm; the interval t between the volute tongue and the tongue is (0.03-0.06) D2(ii) a Width of air outlet 14 of volute 1
Is a constant, and the preferable value range is 5-8;
4.4) first curve segment
Is an equiangular helix, a first curve section
The polar equation of any point is:
D2theta is the angle variable of the polar coordinate at any point, e is the base number of the natural number,
q is the air quantity set by the fan system, b is the thickness of the impeller 2, R2Radius of the impeller 2 (radius of the outlet end), C2uThe outlet flow speed of the impeller 2 is theta which is 80-180 degrees; second curve segment
Third curve segment
The curve is a Bezier curve passing through multiple working conditions and multiple targets;
4.5) continuously adjusting the second curve segment
Third curve segment
Performing a spiral casingAnd (5) optimizing and verifying the molded line.
In the above steps 3) and 4), it is also possible to vary the volute thickness B and the outer diameter D of the impeller 22And (3) performing conventional design in the field to obtain impeller parameters and volute profile lines, wherein if the impeller parameters are only related to the thickness B of the volute, other parameters can be designed conventionally, the curve section of the volute profile lines is not limited to be in a three-section type, and other conventional designs can be adopted, such as a two-section type combined by a spiral line and a Bezier curve, a spiral line in a one-section type and the like.
In the present embodiment, it is preferable that the overall volute width S is 397mm, the volute thickness B is 140mm, and the outer diameter of the impeller 2 is 260 mm. After thinning design, compared with a fan system with the thickness of 160-180 mm, the air quantity and the maximum static pressure are not lost, the noise is not increased, and the integral molded line meets the design rule.
Claims (7)
1. A design method of a fan system of a range hood is provided, the fan system comprises a volute (1) and an impeller (2) arranged in the volute (1), the fan system is arranged in a fan frame (100), and the design method is characterized in that: the method comprises the following steps:
1) setting target parameters of a fan system: flow is Q, full pressure is P and noise;
2) calculating the thickness B of the volute (1) according to the depth B 'of the fan frame (100), wherein B is (0.56-0.7) B'; the outer diameter D of the impeller (2) is obtained by simultaneous calculation2Width S of the volute:
wherein sigma, omega and zeta are constants, sigma is 1-5, omega is 230-235, and zeta is 131-134;
3) designing parameters of an impeller;
4) according to the obtained B, D2And impeller parameters, performing volute profile parameter design, comparing with the target parameters set in the step 1), finishing design if the performance meets the requirements, and otherwise, continuously adjusting B and D2And performing iterative optimization until the performance meets the requirement.
2. The design method of the fan system of the range hood according to claim 1, characterized in that: in step 3), the impeller parameter comprises the inner diameter D of the impeller (2)1：
Calculating the flow coefficient
And coefficient of pressure
Thereby obtaining
u is the outlet linear velocity of the impeller (2), and rho is the density of the gas flowing through the fan system.
3. The design method of the fan system of the range hood according to claim 1, characterized in that: in the step 3), the impeller (2) comprises at least two blades (21) arranged at intervals in the circumferential direction, the impeller parameters further comprise the thickness b of the impeller (2), and the inlet angle beta of each blade (21)1Outlet angle beta of blade (21)2Radius r of the blade (21), the above parameters satisfying: beta is a2＝135°～145°，β1＝45°～70°；b＝B-(15～20)mm；r＝12～17mm。
4. The design method of the fan system of the range hood according to claim 1, characterized in that: in the step 3), the impeller (2) comprises at least two blades (21) which are arranged at intervals in the circumferential direction, the impeller parameters comprise the number Z of the blades (21), and the Z is 58-63.
5. The design method of the fan system of the range hood according to claim 1, characterized in that: in step 3), the volute profile comprises a first straight line segment which is connected in sequence and is in smooth transition
Line segment
First curve segment
Second curve segment
Third curve segment
And a second straight line segment
Line segment
Corresponding to the volute tongue and the first straight line segment
The starting point (A) of the volute is the starting point of the volute profile, and the second straight line segment
The end point (G) of (A) is the end point of the volute profile, the first profile
Starting point (A) and second straight line segment
Corresponds to the air outlet (14) of the volute (1) between the end points (G).
6. The design method of the fan system of the range hood according to claim 5, characterized in that: the step 4) comprises the following steps:
4.1) calculating the opening degree of the volute
Wherein a' is a constant and has a value range of 1-5; e is the base number of the natural number, b is the thickness of the impeller (2), C2uIs the outlet flow speed of the impeller (2);
4.2) determining the second curve section
Starting point (D) and end point (E) positions: radius of origin (D)
Radius of end point (E)
Wherein a' is a constant and has a value range of 0.95-1.1; r2Is the radius of the impeller (2);
4.3) selecting the radius R of the volute tongue to be 3-5 mm; the interval t between the volute tongue and the tongue is (0.03-0.06) D2(ii) a Width of air outlet (14) of volute (1)
Wherein the content of the first and second substances,
the value is constant and ranges from 5 to 8;
4.4) selecting the first curve segment
Is an equiangular helix, a first curve section
The polar equation of any one point is
Theta is a polar angle variable of any point,
C2uis the outlet flow speed of the impeller (2); second curve segment
Third curve segment
Is a Bezier curve;
4.5) continuously adjusting the second curve segment
Third curve segment
And performing volute profile optimization verification.
7. The design method of the fan system of the range hood according to claim 6, characterized in that: theta is 80-180 degrees.
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Denomination of invention: A design method of fan system for Kitchen hood Effective date of registration: 20230721 Granted publication date: 20230214 Pledgee: Bank of China Limited Ningbo Hangzhou Bay New Area sub branch Pledgor: NINGBO FOTILE KITCHEN WARE Co.,Ltd. Registration number: Y2023980049312 |