CN112228400A - Volute profile construction method, volute, air duct structure and range hood - Google Patents

Volute profile construction method, volute, air duct structure and range hood Download PDF

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Publication number
CN112228400A
CN112228400A CN202011212991.1A CN202011212991A CN112228400A CN 112228400 A CN112228400 A CN 112228400A CN 202011212991 A CN202011212991 A CN 202011212991A CN 112228400 A CN112228400 A CN 112228400A
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Prior art keywords
volute
point
check valve
curve
baseline
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Inventor
任富佳
李智宝
于巍巍
温俊生
周海昕
余国成
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Hangzhou Robam Appliances Co Ltd
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Hangzhou Robam Appliances Co Ltd
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Priority to CN202011212991.1A priority Critical patent/CN112228400A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention provides a construction method of a volute profile, a volute, an air duct structure and a range hood, which relate to the technical field of volute design and comprise the following steps: taking the circle center O of the impeller as a circular point, taking the initial ray as a starting point, and passing through an equation
Figure DDA0002757237970000011
Determining a volute curve S2; in the formula, R2Is the radius of the impeller; b2Is the blade outlet width of the impeller; b is the volute thickness; alpha is the airflow angle after the outlet of the blade channel;
Figure DDA0002757237970000013
is the angle between the connecting line of the point on the volute curve S2 and the center O and the initial ray
Figure DDA0002757237970000012
a0、a1、b1Omega is a modified regulation constant term, and-10 is more than or equal to a0≤10，‑10≤a1≤10，a1≥a0，20≤b1Not more than 25, not less than 0.2 and not more than 0.5. The equation provided by the invention locally controls the shape of the volute curve, so that the curve is smooth and transitional, the volute curve is expanded compared with the original structure, the flow channel is enlarged, the resistance is reduced, and the pneumatic noise is reduced.

Description

Volute profile construction method, volute, air duct structure and range hood
Technical Field
The invention relates to the technical field of volute design, in particular to a construction method of a volute profile, a volute, an air duct structure and a range hood.
Background
The air duct system of the household range hood mainly comprises a volute component, an impeller, a motor component and a check valve component, wherein the volute and the check valve provide a gas flow channel, and the reasonable design of the volute molded line has a non-negligible effect on improving the pneumatic performance and the noise performance of the fan.
The volute functions to direct the gas exiting the impeller toward the volute outlet and to convert some of the dynamic pressure to static pressure. The flow in the volute is very complex, when the gas flows along the volute, the gas continuously enters the volute from the impeller, namely the gas flows and is mixed, in addition, the influence of the nonuniformity of the gas flow at the outlet of the impeller and the viscosity of the gas makes the volute more complex, the design of the molded lines of the volute is directly related to the flow loss in the volute, and if the molded lines of the volute are unreasonable in design, the pneumatic performance of the front impeller is also adversely affected.
The volute profile design mostly adopts a conventional logarithmic spiral line or equal-ring-quantity design method, in order to facilitate the design in engineering, four-segment circular arcs are adopted to draw the volute profile, the selection of parameters is accumulated by a large amount of experience, and the drawing process is complicated. The problem of small wind speed at the outlet area of the volute and the problems of large-scale vortex and flow dead zone exists, the phenomenon of aggravation of flow separation caused by airflow stall of the blades near the area also occurs, the resistance of a flow channel is large, and aerodynamic noise is large.
Disclosure of Invention
The invention aims to provide a construction method of a volute molded line, a volute, an air channel structure and a range hood, so as to solve the technical problems of large-scale vortex and flow dead zone, large flow channel resistance and large pneumatic noise of the existing volute molded line in an outlet area of the volute.
The invention provides a method for constructing a volute profile, which comprises the following steps:
taking the circle center O of the impeller as a circular point, taking the initial ray as a starting point, and passing through an equation
Figure BDA0002757237950000021
Determining a volute curve S2;
in the formula, R2Is the radius of the impeller; b2Is the blade outlet width of the impeller; b is the volute thickness; alpha is the airflow angle after the outlet of the blade channel;
Figure BDA0002757237950000022
is the angle between the connecting line of the point on the volute curve S2 and the center O and the initial ray
Figure BDA0002757237950000023
a0、a1、b1Omega is a modified regulation constant term, and-10 is more than or equal to a0≤10，-10≤a1≤10，a1≥a0，20≤b1≤25，0.2≤ω≤0.5。
Further, determining the center O, determining the reference line and the initial placement angle theta0And according to the reference line and the initial setting angle theta0Determining a starting ray;
the step of determining the reference line comprises: the line passing through center O is defined as a straight line parallel to straight line L1 of the circular outlet of the check valve.
Further, a first point P is determined1The second point P2A third point P3Fourth point P4The fifth point P5And a sixth point P6The position of (a);
second point P2Is a volute curveThe point on the line S2, the connecting line of the point and the center O and the reference line form an included angle theta1And theta0<θ1<90°；
Third point P3Is the intersection of the initial ray and the volute curve S2;
the fourth point P is determined by the straight line segment L1 of the circular outlet of the check valve4And a sixth point P6And a fourth point P4And a sixth point P6The middle point of the connecting straight line is a fifth point P5(ii) a Fifth point P5The included angle between the reference line and the connecting line between the circle center O and the reference line is theta2，θ1<θ2<90°；
At a first point P1And a second point P2Constructing a volute tongue curve S1; at a third point P3And fourth P4A first check valve pilot baseline S3 is constructed; at a sixth point P6And a first point P1A second check valve pilot baseline S4 is determined.
Further, the volute tongue curve S1, the first check valve guide baseline S3, and the second check valve guide baseline S4 are all determined by bezier curve equations.
Further, the initial setting angle θ0The range of (c) satisfies: theta is not less than 00≤45°。
Further, the initial setting angle θ0Is 40 deg..
Further, a second point P2An included angle theta between a connecting line with the circle center O and the reference line1Is 78 degrees;
fifth point P5An included angle theta between a connecting line with the circle center O and the reference line2Is 82 deg..
The volute provided by the invention comprises a volute rear plate, a volute front plate, a volute surrounding plate and a volute tongue, wherein the volute surrounding plate and the volute tongue are sequentially connected between the volute rear plate and the volute front plate;
the inner sidewall of the volute shroud is formed by volute curve S2, and volute curve S2 is formed by the equation
Figure BDA0002757237950000031
Determining;
in the formula, R2Is the radius of the impeller; b2Is the blade outlet width of the impeller; b is the volute thickness; alpha is the airflow angle after the outlet of the blade channel;
Figure BDA0002757237950000032
is the angle between the connecting line of the point on the volute curve S2 and the center O and the initial ray
Figure BDA0002757237950000033
a0、a1、b1Omega is a modified regulation constant term, and-10 is more than or equal to a0≤10，-10≤a1≤10，a1≥a0，20≤b1≤25，0.2≤ω≤0.5。
The air duct structure provided by the invention comprises a check valve and the volute, wherein the check valve is arranged at an outlet of the volute; the check valve comprises a first check valve side plate and a second check valve side plate, the first check valve side plate is connected with one end, away from the volute tongue, of the volute casing plate, and the second check valve side plate is connected with one end, away from the volute casing plate, of the volute tongue;
an inner side wall of the first check valve side plate is formed by a first check valve guide base line S3, an inner side wall of the second check valve side plate is formed by a second check valve guide base line S4, and an inner side wall of the volute tongue is formed by a volute tongue curve S1;
the first check valve guide baseline S3 is a concave curve relative to the volute curve S2 in a direction toward the second check valve guide baseline S4, and the second check valve guide baseline S4 is a convex curve relative to the volute curve S2 in a direction away from the first check valve guide baseline S3.
The range hood provided by the invention comprises the air duct structure.
The invention provides a method for constructing a volute profile, which comprises the following steps: taking the circle center O of the impeller as a circular point, taking the initial ray as a starting point, and passing through an equation
Figure BDA0002757237950000041
Determining a volute curve S2; in the formula, R2Is the radius of the impeller; b2Is the blade outlet width of the impeller; b is the volute thickness; alpha is the airflow angle after the outlet of the blade channel;
Figure BDA0002757237950000042
is the angle between the connecting line of the point on the volute curve S2 and the center O and the initial ray
Figure BDA0002757237950000043
a0、a1、b1Omega is a modified regulation constant term, and-10 is more than or equal to a0≤10，-10≤a1≤10，a1≥a0，20≤b1≤25，0.2≤ω≤0.5。
Compared with the prior art, the shape of the volute curve S2 is locally controlled through the equation provided in the method for constructing the volute profile provided by the invention, the curve smooth transition can be kept, meanwhile, the first quadrant curve of the volute curve is locally expanded compared with the original structure, the second quadrant curve is locally expanded compared with the original structure, the fourth quadrant curve is expanded compared with the original structure, the airflow flow channel is enlarged, the flow channel resistance is reduced, and the aerodynamic noise is reduced.
The volute provided by the invention comprises a volute rear plate, a volute front plate, a volute surrounding plate and a volute tongue, wherein the volute surrounding plate and the volute tongue are sequentially connected between the volute rear plate and the volute front plate; the inner sidewall of the volute shroud is formed by volute curve S2, and volute curve S2 is formed by the equation
Figure BDA0002757237950000044
Determining; in the formula, R2Is the radius of the impeller; b2Is the blade outlet width of the impeller; b is the volute thickness; alpha is the airflow angle after the outlet of the blade channel;
Figure BDA0002757237950000045
is the angle between the connecting line of the point on the volute curve S2 and the center O and the initial ray
Figure BDA0002757237950000046
a0、a1、b1Omega is a modified regulation constant term, and-10 is more than or equal to a0≤10，-10≤a1≤10，a1≥a0，20≤b1≤25，0.2≤ω≤0.5。
Compared with the existing structure, the spiral shape of the spiral curve of the volute curve S2 can be locally controlled, the curve smooth transition performance can be kept, meanwhile, the volute curve S2 is locally expanded compared with the original structure, an airflow flow channel is enlarged, the resistance of the gas in the flow channel is reduced, and therefore the aerodynamic noise is reduced.
The air duct structure provided by the invention comprises a check valve and the volute, wherein the check valve is arranged at an outlet of the volute; the check valve comprises a first check valve side plate and a second check valve side plate, the first check valve side plate is connected with one end, away from the volute tongue, of the volute casing plate, and the second check valve side plate is connected with one end, away from the volute casing plate, of the volute tongue; the inner side wall of the first check valve side plate is formed by a first check valve guide baseline S3, the inner side wall of the second check valve side plate is formed by a second check valve guide baseline S4, the inner side wall of the volute tongue is formed by a volute tongue curve S1, the first check valve guide baseline S3 is a concave curve toward the second check valve guide baseline S4 with respect to a volute curve S2, and the second check valve guide baseline S4 is a convex curve away from the first check valve guide baseline S3 with respect to a volute curve S2.
On one hand, the volute and the check valve are connected more smoothly, the separation loss of airflow in the volute caused by curvature sudden change is reduced, and the aerodynamic noise caused by vortex is reduced; on the other hand, the first check valve guide base line S3 is concave relative to the volute curve, and the concave surface guided by the first check valve guide base line S3 can decelerate and pressurize the volute outlet airflow, inhibit the gas from flowing and separating from the volute outlet wall surface too early and reduce the aerodynamic noise; the second check valve guide base line S4 is convex relative to the volute curve, and the convex surface of the second check valve guide base line S4 plays a role in converging air flow. The combined action of the first check valve guide base line S3 and the second check valve guide base line S4 can enable the air flow of the outlet of the check valve to be uniformly distributed, solve the problems of large-scale vortex and flow dead zone existing in the outlet area of the volute, and enable the air flow inside to be uniform in advance by heightening the height of the check valve, so that the problems of outlet turbulent flow and uneven flow velocity distribution are reduced.
The range hood provided by the invention comprises the air duct structure, so that the range hood also has the advantages of the air duct structure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of a volute profile formed by a method for constructing a volute profile according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a comparison between a volute curve and an original curve in a method for constructing a volute profile according to an embodiment of the present invention;
fig. 3 is a structural diagram of an air duct structure of a side suction air duct according to an embodiment of the present invention;
FIG. 4 is an exploded view of the air duct structure of the side suction duct according to the embodiment of the present invention;
fig. 5 is a partial structural view of an air duct structure of a side suction air duct according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a side suction duct application of the duct structure provided in an embodiment of the present invention;
FIG. 7 is a schematic line diagram of a thin air duct of an air duct structure according to an embodiment of the present invention;
FIG. 8 is a block diagram of a duct structure for a thin duct application provided in accordance with an embodiment of the present invention;
FIG. 9 is a front view of a duct structure for a thin duct application provided by an embodiment of the present invention;
FIG. 10 is a block diagram of a thin duct application of the duct structure provided by an embodiment of the present invention;
FIG. 11 is a front view of a thin air duct application of an air duct structure provided by an embodiment of the present invention;
FIG. 12 is a schematic view of gas flow within a volute provided by an embodiment of the present invention;
FIG. 13 is a cloud view of the volute exit area field in its original configuration;
FIG. 14 is a cloud view of a volute exit area field provided by an embodiment of the invention;
FIG. 15 is a cloud plot of the location and intensity of the dominant noise sources on the surface of the wind tunnel in the original configuration;
FIG. 16 is a cloud chart of the location and intensity of the dominant noise sources on the surface of the wind tunnel structure according to an embodiment of the present invention.
Icon: 100-check valve; 110-a first check valve side plate; 120-a second check valve side plate; 200-a volute; 210-a volute enclosure; 220-volute tongue; 230-volute back plate; 240-volute front plate; 300-a motor; 400-an impeller;
s1-volute tongue curve; s2-volute curve; s3-first check valve leading baseline; s4-second check valve guide baseline; l1-straight section of circular outlet of check valve.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 2, the method for constructing a volute profile provided by the present invention includes: using the center O of the impeller 400 as a dot, the initial ray as a starting point, and passing through an equation
Figure BDA0002757237950000071
Determining a volute curve S2; in the formula, R2Is the radius of the impeller 400; b2The blade exit width of the impeller 400;b is the volute 200 thickness; alpha is the airflow angle after the outlet of the blade channel;
Figure BDA0002757237950000072
is the angle between the connecting line of the point on the spiral case curve and the circle center O and the initial ray
Figure BDA0002757237950000073
a0、a1、b1Omega is a modified regulation constant term, and-10 is more than or equal to a0≤10，-10≤a1≤10，a1≥a0，20≤b1≤25，0.2≤ω≤0.5。
Compared with the prior art, the shape of the volute curve is locally controlled through the equation provided in the method for constructing the volute profile provided by the invention, the curve smooth transition property can be kept, meanwhile, the first quadrant curve of the volute curve is locally expanded compared with the original structure, the second quadrant curve is locally expanded compared with the original structure, the fourth quadrant curve is expanded compared with the original structure, the airflow flow channel is enlarged, the resistance of the flow channel is reduced, and the aerodynamic noise is reduced.
It is noted that fig. 12 is a schematic view of the flow of gas in the volute 200, wherein R is2The radius of the impeller, namely the radius of the outlet of the blade channel; c' 2 is the exit velocity of the blade path; c' 2u is the circumferential velocity after the exit of the blade path; c' 2m is the radial velocity after the exit of the blade path; alpha is the airflow angle after the outlet of the blade channel; the airflow angle alpha after the outlet of the blade channel is related to the parameters of the blade, and the value range is as follows: 0<α<90 °, in the present embodiment, α is 6.2 °.
Further, determining the center O, determining the reference line and the initial placement angle theta0And according to the reference line and the initial setting angle theta0Determining a starting ray; the step of determining the reference line comprises: the line through center O is defined as a straight line parallel to the straight line segment of the circular outlet of check valve 100.
Specifically, the center O of the circle, i.e., the axial center of the impeller 400, is first determined, then a reference line is drawn, i.e., a ray OA parallel to the plane of the upper end surface of the check valve 100 is drawn leftward through the center O, and then the initial seating angle θ is determined0I.e. the ray OA is rotated clockwise by an angle theta0Thus obtaining the initial ray OB, and finally obtaining the corrected logarithmic spiral equation
Figure BDA0002757237950000081
The volute curve S2 is determined.
Further, a first point P is determined1The second point P2A third point P3Fourth point P4The fifth point P5And a sixth point P6The position of (a); wherein, P3Is marked by
Figure BDA0002757237950000082
At 0 degrees, R is the intersection of the circle of radius and the start ray OB. P4And P6The fourth point P is determined according to the installation position of the check valve 100 in actual use, namely, the straight line segment of the circular outlet of the check valve 1004And a sixth point P6，P5Is P4And P6Middle point of line between them, P2The point is the starting point of the volute tongue curve and can pass through the setting angle theta of the volute curve1To determine that reference line OA is rotated clockwise by theta1Then forming a ray OC, and the intersection point of the ray OC and the volute curve S2 is P2. Wherein, P1Can be manually set or determined according to the design method in the prior art, so that P is ensured1And P2Can form a concave volute tongue curve S1.
In this embodiment, the second point P2Is a point on the spiral case curve, and the included angle between the connecting line of the point and the circle center O and the reference line is theta1And theta0<θ1<90 degrees; third point P3Is the intersection of the initial ray and the volute curve S2; the fourth point P is determined by the straight line segment L1 of the circular outlet of the check valve4And a sixth point P6And a fourth point P4And a sixth point P6The middle point of the connecting straight line is a fifth point P5(ii) a Fifth point P5The included angle between the reference line and the connecting line between the circle center O and the reference line is theta2，θ1<θ2<90°。
At a first point P1And a second point P2Constructing a volute tongue curve S1; at a third point P3And fourth P4A first check valve pilot baseline S3 is constructed; at a sixth point P6And a first point P1A second check valve pilot baseline S4 is determined.
Preferably, in the present embodiment, the second point P2An included angle theta between a connecting line with the circle center O and the reference line1Is 78 degrees; fifth point P5An included angle theta between a connecting line with the circle center O and the reference line2Is 82 deg..
Further, the initial setting angle θ0The range of (c) satisfies: theta is not less than 00≤45°。
Preferably, the initial setting angle θ0Is 40 deg..
Further, the volute tongue curve S1, the first check valve guide baseline S3, and the second check valve guide baseline S4 are all determined by bezier curve equations.
In particular, P1～P2The segment is a volute tongue curve S1 which is a Bezier curve, P2～P3Is a logarithmic spiral-based volute curve S2, P3～P4Guiding baseline S3, P for the first check valve based on Bezier curve4～P6Straight line segment L1, P of round outlet of check valve6～P1Baseline S4 is directed for the second check valve based on the bezier curve.
As shown in fig. 2, the overall width and height of the volute 200 are substantially the same as those of the original air duct structure, and the improved volute tongue 220 moves further inward relative to the original volute tongue 220, which helps to improve the gas backflow at the outlet of the impeller 400 and improve the outlet static pressure and fan efficiency; the first quadrant curve of the volute curve is partially expanded outwards compared with the original structure, the second quadrant curve is partially expanded outwards compared with the original structure, the fourth quadrant curve is expanded outwards compared with the original structure, an airflow flow channel is enlarged, the resistance of the flow channel is reduced, and the aerodynamic noise is reduced.
Specifically, the first check valve guide baseline S3 is a concave curve relative to the volute curve in a direction toward the second check valve guide baseline S4, and the second check valve guide baseline S4 is a convex curve relative to the volute curve in a direction away from the first check valve guide baseline S3.
As shown in fig. 1, point P3～P4Guide baseline S3 for the first check valve based on the Bezier curve, Point P6～P1For the second check valve pilot baseline S4 based on the Bezier curve, the midpoint P of the outlet of the check valve 1005The deflection angle from the center of the spiral case 200 is theta2Over an angular range of theta0<θ2<90 deg., and theta2＞θ1This example is 82 °.
The first check valve guide base line S3 and the second check valve guide base line S4 are transited by adopting the Bezier curve, the geometric limitation of a circular arc line is broken through, the order number of the Bezier curve is required to be more than or equal to 3, and at least three-order Bezier curves (four control points) are required to generate a path with continuous curvature. The first check valve guide base line S3 and the second check valve guide base line S4 adopt Bezier curves, so that on one hand, the molded line of the volute 200 is connected with the check valve 100 more smoothly, the separation loss of airflow in the volute 200 caused by curvature mutation is reduced, and the aerodynamic noise caused by vortex is reduced; on the other hand, the first check valve guide base line S3 is concave relative to the volute curve, and the concave surface guided by the first check valve guide base line S3 can decelerate and pressurize the airflow at the outlet of the volute 200, inhibit the gas from flowing and separating from the wall surface of the outlet of the volute 200 too early and reduce the aerodynamic noise; the second check valve guide base line S4 is convex relative to the volute curve, and the convex surface of the second check valve guide base line S4 plays a role in converging air flow. The combined action of the first check valve guide baseline S3 and the second check valve guide baseline S4 can make the outlet airflow of the check valve 100 be uniformly distributed, and solve the problem of large-scale vortex and flow dead zone existing at the outlet area of the volute 200, which is obtained by simulation analysis. In addition, the check valve 100 is high, so that the internal air flow can be uniform in advance, and the problems of outlet turbulence and uneven flow velocity distribution can be reduced.
As shown in fig. 1 to 11, the volute provided by the present embodiment includes a volute back plate 230, a volute front plate 240, a volute shroud 210 and a volute tongue 220, and the voluteThe shroud 210 and the volute tongue 220 are sequentially connected between the volute back plate 230 and the volute front plate 240; the inner sidewall of the volute bulkhead 210 is formed by volute curve S2, and the volute curve S2 is given by the equation
Figure BDA0002757237950000101
Determining; in the formula, R2Is the radius of the impeller 400; b2The blade exit width of the impeller 400; b is the volute thickness; alpha is the airflow angle after the outlet of the blade channel;
Figure BDA0002757237950000102
is the angle between the connecting line of the point on the volute curve S2 and the center O and the initial ray
Figure BDA0002757237950000103
a0、a1、b1Omega is a modified regulation constant term, and-10 is more than or equal to a0≤10，-10≤a1≤10，a1≥a0，20≤b1≤25，0.2≤ω≤0.5。
It should be noted that the volute tongue 220 and the volute casing 210 may be of a separate structure or an integral structure, in this embodiment, the volute tongue 220 is of an inward curved surface structure, and a bezier curve may be used to form the volute tongue curve S1 on the inner side wall of the volute tongue 220, or a design method of the volute tongue in the prior art may be used for design.
Compared with the existing structure, the volute 200 provided by the embodiment can locally control the shape of the spiral line of the volute curve S2, can keep the curve smooth transitivity, and meanwhile, compared with the original structure, the volute curve S2 is locally expanded, the airflow flow channel is enlarged, the resistance of the gas in the flow channel is reduced, and thus the aerodynamic noise is reduced.
The air duct structure provided by the embodiment includes the check valve 100 and the volute 200, wherein the check valve 100 is arranged at an outlet of the volute 200; the check valve 100 includes a first check valve side plate 110 and a second check valve side plate 120, the first check valve side plate 110 is connected to an end of the volute casing 210 away from the volute tongue 220, and the second check valve side plate 120 is connected to an end of the volute tongue 220 away from the volute casing 210; the inner sidewall of the first check valve side plate 110 is formed by a first check valve guide baseline S3, the inner sidewall of the second check valve side plate 120 is formed by a second check valve guide baseline S4, the inner sidewall of the volute tongue 220 is formed by a volute tongue curve S1, the first check valve guide baseline S3 is a concave curve toward the second check valve guide baseline S4 with respect to the volute curve S2, and the second check valve guide baseline S4 is a convex curve away from the first check valve guide baseline S3 with respect to the volute curve S2.
When the vortex separator is used in practice, on one hand, the connection between the volute 200 and the check valve 100 is smoother, the separation loss caused by the sudden change of curvature of the airflow in the volute 200 is reduced, and the aerodynamic noise caused by the vortex is reduced; on the other hand, the first check valve guide base line S3 is concave relative to the volute curve S2, and the concave surface guided by the first check valve guide base line S3 can decelerate and pressurize the volute outlet airflow, inhibit the airflow from flowing and separating from the volute outlet wall surface too early and reduce the aerodynamic noise; the second check valve guide base line S4 is convex relative to the volute curve S2, and the convex surface of the second check valve guide base line S4 acts to converge the airflow. The combined action of the first check valve guide base line S3 and the second check valve guide base line S4 can enable the air flow of the outlet of the check valve to be uniformly distributed, solve the problems of large-scale vortex and flow dead zone existing in the outlet area of the volute, and enable the air flow inside to be uniform in advance by heightening the height of the check valve, so that the problems of outlet turbulent flow and uneven flow velocity distribution are reduced.
As shown in fig. 1 to 11, the air duct structure provided by the present invention includes a check valve 100 and a volute 200; the check valve 100 is disposed at an outlet of the volute 200; the volute 200 comprises a volute back plate 230, a volute front plate 240, a volute enclosing plate 210 and a volute tongue 220, wherein the volute enclosing plate 210 and the volute tongue 220 are sequentially connected between the volute back plate 230 and the volute front plate 240; the check valve 100 includes a first check valve side plate 110 and a second check valve side plate 120, the first check valve side plate 110 being connected to an end of the volute casing 210 away from the volute casing 220, the second check valve side plate 120 being connected to an end of the volute casing 220 away from the volute casing 210;
the first check valveThe inner sidewall of the side plate 110 is formed by a first check-valve guide baseline S3, the inner sidewall of the second check-valve side plate 120 is formed by a second check-valve guide baseline S4, the inner sidewall of the volute tongue 220 is formed by a volute tongue curve, the inner sidewall of the volute shroud 210 is formed by a volute curve, and the volute curve is formed by the equation
Figure BDA0002757237950000121
Determining; in the formula, R2Is the radius of the impeller 400; b2The blade exit width of the impeller 400; b is the volute 200 thickness; alpha is the airflow angle after the outlet of the blade channel;
Figure BDA0002757237950000122
is the angle between the connecting line of the point on the spiral case curve and the circle center O and the initial ray
Figure BDA0002757237950000123
a0、a1、b1Omega is a modified regulation constant term, and-10 is more than or equal to a0≤10，-10≤a1≤10，a1≥a0，20≤b1≤25，0.2≤ω≤0.5。
As shown in fig. 3 to 6, the present embodiment provides a schematic view of an air duct structure applied to a side suction air duct, specifically, the air duct structure includes a check valve 100 and a volute 200, the check valve 100 is connected to an outlet of the volute 200, wherein the volute 200 includes a volute front plate 240, a volute rear plate 230, a volute wall 210 and a volute tongue 220, the volute wall 210 and the volute tongue 220 are connected and disposed between the volute front plate 240 and the volute rear plate 230, side surfaces of the volute front plate 240 and the volute rear plate 230 are connected, an inside contour of the volute wall 210 is formed by a volute curve, an inside contour of the volute tongue 220 is formed by a volute tongue curve, the check valve 100 includes a first check valve side plate 110 and a second check valve side plate 120 which are oppositely disposed, and the first check valve side plate 110 is connected to the volute wall 210, and an inside contour of the first check valve guide base line S3 is formed by the first check valve guide base line S3, the inside profile of which is formed by a second check valve pilot baseline S4.
In particular, this may be according to the aboveThe construction method of the volute profile determines a first check valve guide baseline S3, a volute curve S2, a volute tongue curve S1 and a second check valve guide baseline S4, and obtains a determined point P1、P2、P3、P4、P5、P6And the air duct structure, wherein, further, the initial placement angle θ0The range of (c) satisfies: theta is not less than 0045 DEG or less, preferably, in the present embodiment, the initial placement angle theta0Is 40 deg..
P2The included angle between the reference line and the connecting line between the circle center O and the reference line is theta1And theta0<θ1<90 deg. point P5The angle between the reference line and the line connecting the center O is defined as theta2And theta2Satisfies theta1<θ2<90°。
Preferably, in the present embodiment, the point P2An included angle theta between a connecting line with the circle center O and the reference line1Is 78 degrees; point P5An included angle theta between a connecting line with the circle center O and the reference line2Is 82 deg..
Preferably, the volute curve S1, the first check valve guide baseline S3, and the second check valve guide baseline S4 are each determined by the bezier curve equation, the first check valve guide baseline S3 being a concave curve relative to the volute curve in a direction toward the second check valve guide baseline S4, and the second check valve guide baseline S4 being a convex curve relative to the volute curve S2 in a direction away from the first check valve guide baseline S3.
Fig. 7 to 11 are schematic diagrams of the air duct structure for the thin air duct application provided in the present embodiment, which is similar to the air duct structure for the side suction air duct application, wherein fig. 7 is a line diagram of the air duct structure, where θ is0Is 37 DEG theta1Is 72 DEG theta2Is 75 deg.. Fig. 8 and 9 are structural views of an air duct, and fig. 10 and 11 are structural views of a range hood to which the air duct structure is applied.
The range hood provided by the invention comprises the air duct structure, and further comprises the motor 300 and the impeller 400, wherein the motor 300 is used for driving the impeller 400 to rotate, and the shaft of the motor 300 is overlapped with the circle center O, so that the range hood also has the advantages of the air duct structure.
In this embodiment, as shown in fig. 13 to 16, simulation analysis of the air duct structure applied to the side suction air duct and the air duct structure of the original structure are compared as follows:
1) flow field contrast analysis
As shown in fig. 13 and 14, simulation was performed to find that. Original structure: the outlet section has low wind speed and uneven speed distribution. Flow dead corners exist, and a large-area low-speed area exists. The area close to the lower end of the volute tongue 220 is provided with a large-scale vortex, and energy dissipation exists in airflow at the area, so that the efficiency of the fan is influenced, the phenomenon of flow separation aggravation caused by airflow stall of nearby blades is caused, and aerodynamic noise is increased;
the improved structure is as follows: the wind speed of the outlet section is improved, the wind speed distribution is uniform, the flowing dead angle is eliminated, and the vortex at the lower end of the volute tongue 220 is eliminated, so that the pneumatic noise is favorably reduced.
2) Broadband noise analysis
As shown in fig. 15 and 16, it can be seen from the distribution cloud charts of the positions and intensities of the main noise sources on the surface of the air duct predicted by using the Curle dipole noise source model that the maximum surface sound intensity of the original structure is about 83dB, the maximum surface sound intensity of the improved structure is reduced to 80dB, and the distribution range is further reduced, where the noise of the surface pressure fluctuation of the fluid acting on the solid boundary can be calculated by using the Curle broadband noise source model. It is speculated that the improved structure may reduce aerodynamic noise of the duct system.
3) Test contrastive analysis (side draft duct)
Test result of air performance and noise experiment of whole machine
Test parameters Original complete machine Improved complete machine
Maximum static pressure (Ps2nmax) electric control board power 365W 1020Pa 1180Pa
Maximum air quantity (Qvmax) 18.2m3/min 18.3m3/min
Standard stipulates full pressure efficiency (eta) at 7 air volume 32.1％ 37.2％
Actual measurement of fan rotating speed under strong gear 720rpm 620rpm
Actual measurement noise of acoustic power 63.3dB(A) 61.1dB(A)
Experimental data show that when the power of the electric control board is 365W, the maximum static pressure of the improved air duct is increased from 1020Pa to 1180Pa and is increased by 160 Pa; when the air quantity is specified by the standard, the full-pressure efficiency is improved from 32.1% to 37.2%, the full-pressure efficiency is improved by 5.1%, the actually measured rotating speed of the fan under the strong gear is reduced from 720rpm to 620rpm, and the whole noise of the whole machine can be actually measured to be reduced by about 2.2dB (A) by the optimized air duct structure scheme integrally modeled by the volute 200 and the check valve 100.
In summary, compared with the prior art, the method for constructing the volute profile provided by the present invention locally controls the shape of the volute curve S2 through the equation provided in the method for constructing the volute profile provided by the present invention, so that the curve smooth transition can be maintained, and meanwhile, the volute curve has a locally outward-expanded first quadrant curve compared with the original structure, a locally outward-expanded second quadrant curve compared with the original structure, and an outward-expanded fourth quadrant curve compared with the original structure, so that the airflow flow channel is enlarged, the flow channel resistance is reduced, and the aerodynamic noise is reduced.
Compared with the existing structure, the volute provided by the invention can locally control the shape of the spiral line of the volute curve S2, can keep the curve smooth transition, and meanwhile, compared with the original structure, the volute curve is locally expanded, the airflow flow channel is enlarged, the resistance of the gas in the flow channel is reduced, and thus the aerodynamic noise is reduced.
According to the air channel structure provided by the invention, on one hand, the connection between the volute and the check valve is smoother, the separation loss caused by the sudden change of curvature of the air flow in the volute is reduced, and the aerodynamic noise caused by vortex is reduced; on the other hand, the first check valve guide base line S3 is concave relative to the volute curve, and the concave surface guided by the first check valve guide base line S3 can decelerate and pressurize the volute outlet airflow, inhibit the gas from flowing and separating from the volute outlet wall surface too early and reduce the aerodynamic noise; the second check valve guide base line S4 is convex relative to the volute curve, and the convex surface of the second check valve guide base line S4 plays a role in converging air flow. The combined action of the first check valve guide base line S3 and the second check valve guide base line S4 can enable the air flow of the outlet of the check valve to be uniformly distributed, solve the problems of large-scale vortex and flow dead zone existing in the outlet area of the volute, and enable the air flow inside to be uniform in advance by heightening the height of the check valve, so that the problems of outlet turbulent flow and uneven flow velocity distribution are reduced.
The range hood provided by the invention comprises the air duct structure, so that the range hood also has the advantages of the air duct structure.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for constructing a volute profile, comprising:
taking the circle center O of the impeller (400) as a circular point, taking the initial ray as a starting point, and passing through an equation
Figure FDA0002757237940000011
Determining a volute curve S2;
in the formula, R2Is the radius of the impeller (400); b2Is the blade exit width of the impeller (400); b is the volute thickness; alpha is the airflow angle after the outlet of the blade channel;
Figure FDA0002757237940000012
is the angle between the connecting line of the point on the volute curve S2 and the center O and the initial ray
Figure FDA0002757237940000013
a0、a1、b1Omega is a modified regulation constant term, and-10 is more than or equal to a0≤10，-10≤a1≤10，a1≥a0，20≤b1≤25，0.2≤ω≤0.5。
2. The method of constructing a volute profile according to claim 1, wherein the center of circle O is determined, the reference line is determined, and the initial lay angle θ is determined0And according to the reference line and the initial setting angle theta0Determining a starting ray;
the step of determining the reference line comprises: the line passing through center O is defined as a straight line parallel to straight line L1 of the circular outlet of the check valve.
3. Method for constructing a spiral casing profile according to claim 2, characterized in that the first point P is determined1The second point P2A third point P3Fourth point P4The fifth point P5And a sixth point P6The position of (a);
second point P2Is a point on the volute curve S2, and the included angle between the connecting line of the point and the center O and the reference line is theta1And theta0<θ1<90°；
Third point P3Is the intersection of the initial ray and the volute curve S2;
the fourth point P is determined by the straight line segment L1 of the circular outlet of the check valve4And a sixth point P6And a fourth point P4And a sixth point P6The middle point of the connecting straight line is a fifth point P5(ii) a Fifth point P5The included angle between the reference line and the connecting line between the circle center O and the reference line is theta2，θ1<θ2<90°；
At a first point P1And a second point P2Constructing a volute tongue curve S1; at a third point P3And fourth P4A first check valve pilot baseline S3 is constructed; at a sixth point P6And a first point P1A second check valve pilot baseline S4 is determined.
4. The method of constructing a volute profile according to claim 3, wherein the volute tongue curve S1, the first check valve pilot baseline S3, and the second check valve pilot baseline S4 are determined using a Bezier curve equation.
5. The method of constructing a volute profile according to any of claims 2 to 4, wherein the initial lay angle θ0The range of (c) satisfies: theta is not less than 00≤45°。
6. The method of constructing a volute profile according to claim 5, wherein the starting lay angle θ0Is 40 deg..
7. Method for constructing a volute profile according to claim 3, wherein the second point P2An included angle theta between a connecting line with the circle center O and the reference line1Is 78 degrees;
fifth point P5An included angle theta between a connecting line with the circle center O and the reference line2Is 82 deg..
8. The volute is characterized by comprising a volute back plate (230), a volute front plate (240), a volute enclosing plate (210) and a volute tongue (220), wherein the volute enclosing plate (210) and the volute tongue (220) are sequentially connected between the volute back plate (230) and the volute front plate (240);
the inner sidewall of the volute enclosure (210) is formed by a volute curve S2, and the volute curve S2 is formed by the equation
Figure FDA0002757237940000021
Determining;
in the formula, R2Is the radius of the impeller (400); b2Is the blade exit width of the impeller (400); b is the volute thickness; alpha is the airflow angle after the outlet of the blade channel;
Figure FDA0002757237940000022
is the angle between the connecting line of the point on the volute curve S2 and the center O and the initial ray
Figure FDA0002757237940000023
a0、a1、b1Omega is a modified regulation constant term, and-10 is more than or equal to a0≤10，-10≤a1≤10，a1≥a0，20≤b1≤25，0.2≤ω≤0.5。
9. An air duct structure, characterized by comprising a non-return valve (100) and a volute (200) of claim 8, the non-return valve (100) being arranged at the outlet of the volute (200); the check valve (100) comprises a first check valve side plate (110) and a second check valve side plate (120), the first check valve side plate (110) is connected with one end of the volute casing plate (210) far away from the volute tongue (220), and the second check valve side plate (120) is connected with one end of the volute tongue (220) far away from the volute casing plate (210);
an inner sidewall of the first check valve side plate (110) is formed by a first check valve guide base line S3, an inner sidewall of the second check valve side plate (120) is formed by a second check valve guide base line S4, and an inner sidewall of the volute tongue (220) is formed by a volute tongue curve S1;
the first check valve guide baseline S3 is a concave curve relative to the volute curve S2 in a direction toward the second check valve guide baseline S4, and the second check valve guide baseline S4 is a convex curve relative to the volute curve S2 in a direction away from the first check valve guide baseline S3.
10. A range hood comprising the air duct structure of claim 9.
CN202011212991.1A 2020-11-03 2020-11-03 Volute profile construction method, volute, air duct structure and range hood Pending CN112228400A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113283031A (en) * 2021-05-28 2021-08-20 宁波方太厨具有限公司 Design method of fan system of range hood
CN114876830A (en) * 2022-04-26 2022-08-09 杭州老板电器股份有限公司 Volute, fan and range hood
CN117634094A (en) * 2023-12-12 2024-03-01 广东宏伙控股集团有限公司 Supercharging volute and design method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113283031A (en) * 2021-05-28 2021-08-20 宁波方太厨具有限公司 Design method of fan system of range hood
CN114876830A (en) * 2022-04-26 2022-08-09 杭州老板电器股份有限公司 Volute, fan and range hood
CN114876830B (en) * 2022-04-26 2024-05-10 杭州老板电器股份有限公司 Spiral case, fan and lampblack absorber
CN117634094A (en) * 2023-12-12 2024-03-01 广东宏伙控股集团有限公司 Supercharging volute and design method thereof
CN117634094B (en) * 2023-12-12 2024-06-04 广东宏伙控股集团有限公司 Supercharging volute and design method thereof

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