CN113513501B - Volute for range hood, fan system and range hood - Google Patents

Volute for range hood, fan system and range hood Download PDF

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Publication number
CN113513501B
CN113513501B CN202110361336.0A CN202110361336A CN113513501B CN 113513501 B CN113513501 B CN 113513501B CN 202110361336 A CN202110361336 A CN 202110361336A CN 113513501 B CN113513501 B CN 113513501B
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volute
section
cover
air inlet
wall plate
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CN113513501A (en
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陈旭斌
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Ningbo Fotile Kitchen Ware Co Ltd
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Ningbo Fotile Kitchen Ware Co Ltd
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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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • 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 relates to a volute, a fan system and a range hood for a range hood, wherein the molded line of the annular wall of the volute comprises a first diffusion section AB, a volute tongue section BC, a contracted first curve section CD, a contracted second curve section DG, an externally expanded third curve section GH and a second diffusion section HI which are sequentially arranged in the circumferential direction and are in smooth connection, the first diffusion section and the second diffusion section are straight-line sections, the first diffusion section is positioned on the right side of an air outlet, the second diffusion section is positioned on the left side of the air outlet, a position between the starting point of the first diffusion section and the terminal point of the second diffusion section corresponds to the air outlet of the volute, and the second curve section DG corresponds to the contour line of a first section or a second section. Therefore, based on the actual flowing state of the airflow, the method of zone outward expansion and flow compensation is adopted, the overall size of the volute is reasonably optimized, the air inlet and outlet vortex is reduced, the flowing state is improved, the static pressure is increased, and the noise is reduced.

Description

Volute and fan system for range hood and range hood
Technical Field
The invention belongs to the technical field of range hoods, and particularly relates to a volute, a fan system and a range hood for the range hood.
Background
The existing range hood generally uses a centrifugal fan as a power system, and the centrifugal fan has the advantages of high static pressure, low noise, compact structure and the like. The volute is one of core components of the centrifugal fan and has the functions of concentrating and guiding gas leaving an impeller and converting partial kinetic energy diffusion of the gas into static pressure. The design of the volute mainly comprises the steps of determining the molded line and the width of the volute, wherein the molded line of the volute mainly adopts logarithmic spiral, archimedes spiral, multi-section curve fitting and correction based on the molded line, and corresponds to each angle
Figure 843286DEST_PATH_IMAGE001
A corresponding radius value is obtained
Figure 281220DEST_PATH_IMAGE002
The points are then connected, and the volute is generally of a constant width design with a rectangular cross-section.
1. The design method is generally based on the assumptions of conservation of moment of momentum, no backflow and the like, and has larger difference with the actual flow state of the airflow in the volute, so that the pneumatic performance of the fan system on the range hood is poor; 2. based on correction methods such as viscous force and the like, the method has certain improvement effect on outward expansion or contraction of the part sections, but the equal-width rectangular section still causes vortexes in areas such as an air inlet and the like; 3. in order to improve the flow state in the volute and obtain lower noise, a larger amount of volute is generally adopted, the size of a range hood box body is too large, and leakage and vortex aggravation under the condition of large resistance are caused.
The fan volute of the low-noise range hood disclosed in the chinese invention patent application with the patent number CN201310528902.8 (with the publication number CN 103697509A) comprises a housing with an air inlet and an air outlet, wherein the air outlet is positioned at the upper part of the housing, the housing comprises a front cover plate, a rear cover plate and an annular wall connecting the front cover plate and the rear cover plate, and the fan volute is characterized in that: the lower part of at least one cover plate of the front cover plate and the rear cover plate is a connecting inclined plane, the connecting inclined plane is connected with the annular wall, and the connecting inclined plane gradually inclines inwards from top to bottom.
1. Firstly, the molded line of the volute is not designed based on the actual flowing state, so that the overall size of the volute is optimized, the flowing state is improved, the noise is reduced and the like; 2. the patent mainly changes the local flow area in the volute, and then the air flow speed is accelerated at a specific design point through the skillful treatment, so that the resistance of pressure pulsation is enhanced, most of the pressure pulsation is counteracted, the pressure pulsation in the pipe network is prevented from being further transmitted to the volute tongue, the air flow state at the volute tongue is improved, and the noise is reduced; and the flow distribution of the front air inlet and the rear air inlet and the prevention of the formation of the air inlet vortex are not improved.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide a volute for a range hood, which is designed based on the actual flow state of airflow, with the molded line of the volute annular wall aiming at the current situation of the prior art.
The first technical problem to be solved by the present invention is to provide a fan system using the above volute, aiming at the current situation of the prior art.
The third technical problem to be solved by the present invention is to provide a range hood using the above fan system, aiming at the current situation of the prior art.
The technical scheme adopted by the invention for solving the first technical problem is as follows: a volute for a range hood comprises
A volute front cover, on which a front air inlet is arranged;
the volute rear cover and the volute front cover are arranged at intervals in the front-rear direction, and a rear air inlet is formed in the volute rear cover;
the volute casing annular wall is connected between the volute casing front cover and the volute casing rear cover, an air outlet positioned at the top of the volute casing is formed by the volute casing annular wall, the lower part of the front end surface of the volute casing annular wall is obliquely cut to form a first tangent plane which is inclined towards the volute casing rear cover from top to bottom, and the lower part of the rear end surface of the volute casing annular wall is obliquely cut to form a second tangent plane which is inclined towards the volute casing front cover from top to bottom;
the method is characterized in that: the molded line of the volute annular wall comprises a first diffusion section AB, a volute tongue section BC, a first contracted curve section CD, a second contracted curve section DG, a third outward expanded curve section GH and a second diffusion section HI which are sequentially arranged in the circumferential direction and connected smoothly, the first diffusion section and the second diffusion section are straight-line sections, the first diffusion section is located on the right side of the air outlet, the second diffusion section is located on the left side of the air outlet, an air outlet of the volute corresponds to the starting point of the first diffusion section and the terminal point of the second diffusion section, and the second curve section DG corresponds to the contour line of the first section or the second section.
In order to enable the front volute cover and the rear volute cover to be matched with the first tangent plane and the second tangent plane, the front volute cover comprises a front wall plate and a first inclined part which is connected to the lower end of the front wall plate and inclines towards the rear volute cover from top to bottom, the first inclined part is arranged corresponding to the first tangent plane, the rear volute cover comprises a rear wall plate and a second inclined part which is connected to the lower end of the rear wall plate and inclines towards the front volute cover from top to bottom, the second inclined part is arranged corresponding to the second tangent plane, the front air inlet is formed in the front wall plate, and the rear air inlet is formed in the rear wall plate.
For contracting the first curve, contracting the second curve and expanding the third curve, the first and second diffuser sections being adapted to the gas flowIn an actual flowing state, the molded line has a center point (O), a coordinate system is established by taking a horizontal line passing through the center point (O) as an X axis and a vertical line passing through the center point (O) as a Y axis, and the radius of the first curve segment is as follows:
Figure 639520DEST_PATH_IMAGE003
，
Figure 112090DEST_PATH_IMAGE004
the radius of the second curve segment is:
Figure 225540DEST_PATH_IMAGE005
；
the radius of the third curve segment is:
Figure 337721DEST_PATH_IMAGE006
；
wherein R is 2 For the radius of the impeller, the flow at the air inlet is designed to be Q, and the distance between the front wall plate of the front cover of the volute and the rear wall plate of the rear cover of the volute is B, c' 2u The circumferential speed of the air outlet is defined, and t is the radial minimum distance between the impeller and the annular wall of the volute;
the included angle between the first diffusion section and the Y axis is alpha, the included angle between the second diffusion section and the Y axis is beta, and alpha is more than or equal to 2 beta and is more than or equal to 5 degrees and less than or equal to 15 degrees.
In the above solution, the coordinate values of the datum lines of the first curve segment, the second curve segment and the third curve segment of the volute profile are as follows:
Figure 562029DEST_PATH_IMAGE007
。
in order to break the vortex and improve the flow, the part of the annular wall of the volute, which corresponds to the first diffuser section, is a first diffuser, the first diffuser is a triangular inclined surface which is inclined inwards from top to bottom, the bottom edge of the first diffuser is connected with the front cover of the volute, and the vertex of the first diffuser faces the rear cover of the volute and is spaced from the rear cover of the volute. The radius of the volute tongue is equal to R (the value is 15-25 mm), the minimum clearance value between the volute tongue and the impeller is guaranteed to be t, so that a part of the section of the volute tongue is cut to form a first diffusion part and the volute tongue, the air outlet surface is a combination of a fitting curve and a straight line section, the air inlet amount of a front air inlet is large, the air inlet amount of a rear air inlet is small, the front air flow passes through the circular arc section of the volute tongue and the diffusion part of the first diffusion part, and the rear air flow only passes through the circular arc section of the volute tongue; meanwhile, after the partial section of the volute tongue is cut off, the plane where the air outlet is located can be ensured not to be higher than the annular wall of the volute, and the size of the volute in the vertical direction is ensured.
Preferably, the interval of the front wall plate of the volute front cover and the rear wall plate of the volute rear cover is B, the width of the air outlet is C, and B < C, so that the airflow resistance and the flow speed at the air outlet can be reduced, the backflow and the vortex are reduced, and the noise is reduced.
The technical scheme adopted by the invention for solving the second technical problem is as follows: the fan system applying the volute is characterized in that: the fan system further comprises an impeller arranged in the volute and a motor used for driving the impeller to rotate, wherein the axis of the impeller passes through the central point (O).
In order to improve the flow at the front air inlet and reduce the vortex so as to improve the static pressure, a first turned edge extending towards the interior of the volute is formed on the periphery of the front air inlet, the diameter of the front air inlet is D3, D3 is not less than (D2 + 6), and D2 is the diameter of the impeller.
In order to reduce backflow from the volute tongue and break local eddy, a second curled edge extending towards the interior of the volute is formed on the periphery of the rear air inlet, the local contour line of the rear air inlet is a vertical section extending vertically, the length of the second curled edge corresponding to the vertical section is larger than or equal to 5mm, the diameter of the rear air inlet is D4, D4 = (0.8-0.9) × D2, and D2 is the diameter of the impeller.
The technical scheme adopted by the invention for solving the third technical problem is as follows: the utility model provides an use range hood of above-mentioned fan system which characterized in that: the fan system is arranged in the shell, the shell comprises a panel which is positioned at the front part of the shell and inclines backwards from top to bottom, and an air inlet is formed in the panel.
Preferably, the plane where the air outlet of the volute is located is horizontally arranged, and the included angle between the plane where the air outlet of the volute is located and the plane where the front wall plate of the front cover of the volute is theta 1 ，10°≤θ 1 Is less than or equal to 30 degrees. The design can increase the depth of the smoke collecting cavity.
In order to improve the flowing state of the air inlet, the included angle between the front wall plate of the volute front cover and the first inclined part is theta 2 The included angle between the rear wall plate of the volute rear cover and the second inclined part is theta 3 And the included angle between the panel and the top wall plate of the shell is recorded as theta 4 ，θ 3 =θ 1 ，θ 2 <θ 4 (ii) a The vertical distance between the central point (O) of the molded line and the starting point of the volute tongue section is L 1 Said vertical distance L of said centre point (O) from the bottom of the profile 4 The vertical distance from the top end of the first section to the bottom of the molded line is L 2 The vertical distance from the top end of the second tangent plane to the bottom of the molded line is L 3 The distance satisfies the following condition: l is 4 - L 3 ≥R 2 、L 2 / L 3 =k* L 4 / L 1 The value range of k is 0.8 to 0.9; the contour line of the rear air inlet is partially a vertical section which extends vertically, and the length of the vertical section of the rear air inlet is L 7 ，L 7 And t is more than or equal to 2t and is the minimum radial distance between the impeller and the annular wall of the volute. The angle is used as the first dimension for control, the distance is used for control of the second dimension, flow distribution of the air inlet (front/back, upper and lower parts) is achieved, formation of air inlet vortexes is reduced, flow speed of the upper side of the air inlet is faster, leakage of the lower side of the air inlet is reduced, and formation of vortexes in local areas is reduced.
Compared with the prior art, the invention has the advantages that: the volute molded line comprises a first diffusion section, a volute tongue section, a contracted first curve section, a contracted second curve section, an externally expanded third curve section and a second diffusion section which are sequentially arranged in the circumferential direction and are smoothly connected, so that the overall size of the volute is reasonably optimized, the air inlet and outlet vortex is reduced, the flowing state is improved, the static pressure is improved, and the noise is reduced by adopting a method of partitioned external expansion and flow compensation based on the actual flowing state of air flow; in addition, because the first tangent plane and the second tangent plane are arranged on the annular wall of the volute, the inside of the volute is not provided with a rectangular section with the same width, and the condition that the vortex occurs in the air inlet area can be improved.
Drawings
Fig. 1 is a schematic structural diagram of a range hood according to an embodiment of the present invention;
FIG. 2 is a schematic view of the volute of FIG. 1;
FIG. 3 is a schematic view of the structure of FIG. 2 in another direction;
FIG. 4 is an exploded view of FIG. 2;
FIG. 5 is a schematic view of the structure of FIG. 2 in another direction;
FIG. 6 is a schematic view of the volute wall contour of FIG. 2.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1 to 6, the range hood of the preferred embodiment includes a housing 4 and a fan system, the fan system is disposed in the housing 4, the housing 4 includes a panel 41 located at the front portion of the housing and inclined backward from top to bottom, and an air inlet is formed in the panel 41. The fan system includes a volute, an impeller 5 disposed in the volute, and a motor for driving the impeller 5 to rotate, which is prior art and will not be described herein.
The volute comprises a volute front cover 1, a volute rear cover 2 and a volute annular wall 3, the volute rear cover 2 and the volute front cover 1 are arranged at intervals in the front-rear direction, the volute annular wall 3 is connected between the volute front cover 1 and the volute rear cover 2, and the volute front cover 1, the volute rear cover 2 and the volute annular wall 3 enclose an air outlet 31 located at the top of the volute.
Referring to fig. 2 and 4, the lower part of the front end face of the volute annular wall 3 is beveled to form a first tangential plane 32 which inclines from top to bottom towards the volute rear cover 2, the lower part of the rear end face of the volute annular wall 3 is beveled to form a second tangential plane 33 which inclines from top to bottom towards the volute front cover 1, the volute front cover 1 comprises a front wall plate 12 and a first inclined part 13 which is connected to the lower end of the front wall plate 12 and inclines from top to bottom towards the volute rear cover 2, the first inclined part 13 is arranged corresponding to the first tangential plane 32, the volute rear cover 2 comprises a rear wall plate 22 and a second inclined part 23 which is connected to the lower end of the rear wall plate 22 and inclines from top to bottom towards the volute front cover 1, the second inclined part 23 is arranged corresponding to the second tangential plane 33, the front wall plate 12 is provided with a front air inlet 11, and the rear wall plate 22 is provided with a rear air inlet 21.
Referring to fig. 1, the distance between the front wall plate 12 of the front volute cover 1 and the rear wall plate 22 of the rear volute cover 2 is B, the width of the air outlet 31 is C, and B < C, so that the airflow resistance and the flow speed at the air outlet 31 can be reduced, and backflow and vortex are reduced, thereby reducing noise.
Referring to fig. 6, the profile of the annular wall 3 of the volute includes a first expansion segment AB, an end point, a volute tongue segment BC, a first curve segment CD, a first expansion segment AB, an end point, a second curve segment DG, a second expansion segment DG, a third curve segment GH, a second expansion segment H, a second expansion segment DG, a first expansion segment AB and a second expansion segment HI, which are sequentially arranged in the circumferential direction and smoothly connected, where the starting point is a straight line, the end point is a B, the starting point is a G, the end point is a H, the starting point is a H, the end point is a I, the first expansion segment AB and the second expansion segment HI are straight line segments, the first expansion segment AB is located on the right side of the air outlet 31, the second expansion segment HI is located on the left side of the air outlet 31, the starting point a of the first expansion segment AB and the end point I of the second expansion segment HI correspond to the air outlet 31, the second expansion segment DG corresponds to the profile line of the curved line, the first tangent line 32, and the second expansion segment DG corresponds to the profile line of the second tangent line 33, and the second expansion segment DG corresponds to the curved line. In this embodiment, the second curve section DG corresponds to the contour line of the first tangent plane 32, and the curve section EF corresponds to the contour line of the second tangent plane 33.
As shown in fig. 6, in the present embodiment, the molded line has a central point O, the axis of the impeller 5 passes through the central point O, a coordinate system is established by using a horizontal line passing through the central point O as an X-axis and a vertical line passing through the central point O as a Y-axis, an included angle between the first diffusion section AB and the Y-axis is α, an included angle between the second diffusion section HI and the Y-axis is β, and α is greater than or equal to 2 β and is greater than or equal to 5 ° and less than or equal to 15 °.
The radius of the first curve segment CD is:
Figure 561209DEST_PATH_IMAGE003
，
Figure 845560DEST_PATH_IMAGE004
the radius of the second curve segment DG is:
Figure 258087DEST_PATH_IMAGE005
；
the radius of the third curve segment GH is:
Figure 286085DEST_PATH_IMAGE006
；
wherein R is 2 The radius of the impeller 5 is designed, the flow at the air inlet is Q, and the distance between the front wall plate 12 of the volute front cover 1 and the rear wall plate 22 of the volute rear cover 2 is B, c' 2u Is the circumferential speed of the air outlet 31, and t is the radial minimum distance between the impeller 5 and the volute annular wall 3;
coordinate values of datum lines of a first curve segment CD, a second curve segment DG and a third curve segment GH of the volute type line are as follows:
Figure 654619DEST_PATH_IMAGE007
。
in addition, the part of the volute annular wall 3 corresponding to the first diffuser section AB is a first diffuser 34, the volute tongue section BC corresponds to the volute tongue 35, the first diffuser 34 is a triangular inclined surface inclined inward from top to bottom, the bottom edge of the first diffuser 34 is connected with the volute front cover 1, and the vertex of the first diffuser 34 faces the volute rear cover 2 and has a distance from the volute rear cover 2. The radius of the volute tongue 35 is equal to R (the value is 15-25 mm), the minimum gap value between the volute tongue 35 and the impeller 5 is guaranteed to be t, so that a part of the volute tongue 35 is cut to form a first diffusion part 34 and the volute tongue 35, the surface of the air outlet 31 is a combination of a fitting curve and a straight line segment, the air inlet amount of the front air inlet 11 is large, the air inlet amount of the rear air inlet 21 is small, therefore, front side air flow passes through an arc segment of the volute tongue 35, a diffusion section of the first diffusion part 34 and rear side air flow passes through the arc segment of the volute tongue 35, the flow speed of the front air inlet 21 and the rear air flow is dragged by utilizing the phase difference and the flow speed difference of the air flow, and the front side and the rear side of the air outlet 31 are different in flow speed under the influence of the existence of the diffusion section, so that vortex breaking and flow improvement are achieved; meanwhile, after the partial section of the volute tongue 35 is cut off, the plane where the air outlet 31 is located can be ensured not to be higher than the volute annular wall 3, and the size of the volute in the vertical direction is ensured.
A first turned edge 14 extending towards the interior of the volute is formed on the periphery of the front air inlet 11, the diameter of the front air inlet 11 is D3, D3 is not less than (D2 + 6), and D2 is the diameter of the impeller 5, so that the flow at the front air inlet 11 is improved, the vortex is reduced, and the static pressure is improved; in order to reduce backflow from the volute tongue 35 and break local vortex, a second curled edge 25 extending towards the interior of the volute is formed on the periphery of the rear air inlet 21, the outline of the rear air inlet 21 is a vertical section 24 extending vertically, the length of the second curled edge 25 corresponding to the vertical section 24 is greater than or equal to 5mm, the diameter of the rear air inlet 21 is D4, and D4 = 0.8-0.9D 2.
Referring to fig. 1, when the blower system is installed in the casing 4, the plane where the air outlet 31 of the volute is located is horizontally disposed, and the included angle between the plane where the air outlet 31 of the volute is located and the plane where the front wall plate 12 of the front cover 1 of the volute is θ 1 ，10°≤θ 1 Is less than or equal to 30 degrees. The design can increase the depth of the smoke collecting cavity, and the area enclosed by the dotted line in fig. 1 is the smoke collecting cavity area.
The included angle between the front wall plate 12 of the volute front cover 1 and the first inclined part 13 is theta 2 The included angle between the rear wall plate 22 of the volute casing rear cover 2 and the second inclined part 23 is theta 3 The angle between the panel 41 and the top wall plate (top wall plate arranged in parallel) of the housing 4 is denoted as θ 4 ，θ 3 =θ 1 ，θ 2 <θ 4 (ii) a The vertical distance between the central point O of the molded line and the starting point B of the volute tongue segment BC is L 1 Vertical distance L of center point O from bottom of molded line 4 The vertical distance from the top end of the first section 32 to the bottom of the profile is L 2 The vertical distance from the top end of the second section 33 to the bottom of the profile is L 3 The distance satisfies the following condition: l is a radical of an alcohol 4 - L 3 ≥R 2 、L 2 / L 3 =k* L 4 / L 1 The value range of k is 0.8 to 0.9; contour line of rear air inlet 21A vertical section 24 partially extending vertically, the vertical section 24 of the rear air inlet 21 having a length L 7 ，L 7 More than or equal to 2t, t is the minimum radial distance between the impeller 5 and the volute annular wall 3. The angle is used as the first dimension for control, the distance is used for control of the second dimension, flow distribution of the air inlet (front/back, upper and lower parts) is achieved, formation of air inlet vortexes is reduced, flow speed of the upper side of the air inlet is faster, leakage of the lower side of the air inlet is reduced, and formation of vortexes in local areas is reduced.

Claims (11)

1. A volute for a range hood comprises
A front cover (1) of the volute, wherein a front air inlet (11) is formed in the front cover;
the volute rear cover (2) and the volute front cover (1) are arranged at intervals in the front-rear direction, and a rear air inlet (21) is formed in the volute rear cover (2);
the volute casing ring wall (3) is connected between the volute casing front cover (1) and the volute casing rear cover (2) and surrounds an air outlet (31) positioned at the top of the volute casing, the lower part of the front end face of the volute casing ring wall (3) is obliquely cut to form a first tangent plane (32) which inclines towards the volute casing rear cover (2) from top to bottom, and the lower part of the rear end face of the volute casing ring wall (3) is obliquely cut to form a second tangent plane (33) which inclines towards the volute casing front cover (1) from top to bottom;
the method is characterized in that: the molded line of the volute annular wall (3) comprises a first diffusion section (AB), a volute tongue section (BC), a first curve section (CD), a second curve section (DG), a third curve section (GH) and a second diffusion section (HI) which are sequentially arranged in the circumferential direction and are smoothly connected, the first diffusion section (AB) and the second diffusion section (HI) are straight line sections, the first diffusion section (AB) is positioned on the right side of the air outlet (31), the second diffusion section (HI) is positioned on the left side of the air outlet (31), a position between a starting point of the first diffusion section (AB) and a terminal point of the second diffusion section (HI) corresponds to the air outlet (31) of the volute, and the second curve section (DG) corresponds to the contour line of the first tangent plane (32) or the second tangent plane (33);
the profile has a center point (O), a coordinate system is established with a horizontal line passing through the center point (O) as the X-axis and a vertical line passing through the center point (O) as the Y-axis, and the radius of the first curve segment (CD) is:
Figure 145855DEST_PATH_IMAGE001
，
Figure 917502DEST_PATH_IMAGE002
the radius of the second curve segment (DG) is:
Figure 868141DEST_PATH_IMAGE003
；
the radius of the third curve segment (GH) is:
Figure 688329DEST_PATH_IMAGE004
；
wherein R is 2 The flow at the designed air inlet is Q for the radius of the impeller, and the distance between a front wall plate (12) of the front volute cover (1) and a rear wall plate (22) of the rear volute cover (2) is B, c' 2u The circumferential speed of the air flow at the air outlet (31) is shown, and t is the radial minimum distance between the impeller and the volute annular wall (3);
the included angle between the first diffusion section (AB) and the Y axis is alpha, the included angle between the second diffusion section (HI) and the Y axis is beta, and alpha is more than or equal to 2 beta and beta is more than or equal to 5 degrees and less than or equal to 15 degrees.
2. The spiral casing for a range hood according to claim 1, wherein: the volute front cover (1) comprises a front wall plate (12) and a first inclined part (13) which is connected to the lower end of the front wall plate (12) and inclines towards the volute rear cover (2) from top to bottom, the first inclined part (13) is arranged corresponding to a first tangent plane (32), the volute rear cover (2) comprises a rear wall plate (22) and a second inclined part (23) which is connected to the lower end of the rear wall plate (22) and inclines towards the volute front cover (1) from top to bottom, the second inclined part (23) is arranged corresponding to a second tangent plane (33), the front air inlet (11) is formed in the front wall plate (12), and the rear air inlet (21) is formed in the rear wall plate (22).
3. The spiral casing for a range hood according to claim 1, wherein: coordinate values of datum lines of a first curve segment (CD), a second curve segment (DG) and a third curve segment (GH) of the molded line of the volute are as follows:
Figure 40813DEST_PATH_IMAGE005
。
4. the volute of a range hood according to claim 1, wherein: the volute is characterized in that a first diffusion part (34) is arranged on the portion, corresponding to the first diffusion section (AB), of the volute annular wall (3), a volute tongue section (BC) corresponds to a volute tongue (35) of the volute, the first diffusion part (34) is a triangular inclined surface inclining inwards from top to bottom, the bottom edge of the first diffusion part (34) is connected with the front volute cover (1), and the top point of the first diffusion part (34) faces the rear volute cover (2) and is spaced from the rear volute cover (2).
5. The volute of a range hood according to claim 4, wherein: the distance between a front wall plate (12) of the volute front cover (1) and a rear wall plate (22) of the volute rear cover (2) is B, the width of the air outlet (31) is C, and B is less than C.
6. A fan system applying the volute for the range hood as claimed in any one of claims 1 to 5, wherein: the fan system further comprises an impeller (5) arranged in the volute and a motor used for driving the impeller (5) to rotate, and the axis of the impeller (5) passes through the central point (O).
7. The fan system of claim 6, wherein: the periphery of the front air inlet (11) is formed with a first curled edge (14) extending towards the interior of the volute, the diameter of the front air inlet (11) is D3, D3 is not less than (D2 + 6), and D2 is the diameter of the impeller (5).
8. The fan system of claim 6, wherein: the periphery of the rear air inlet (21) is provided with a second turned edge (25) extending towards the interior of the volute, the local contour line of the rear air inlet (21) is a vertical section (24) extending vertically, the length of the second turned edge (25) corresponding to the vertical section (24) is more than or equal to 5mm, the diameter of the rear air inlet (21) is D4, D4 = (0.8-0.9) × D2, and D2 is the diameter of the impeller (5).
9. A range hood to which the fan system of claim 6 is applied, wherein: the fan is characterized by further comprising a shell (4), the fan system is arranged in the shell (4), the shell (4) comprises a panel (41) which is located on the front portion of the shell and inclines backwards from top to bottom, and an air inlet is formed in the panel (41).
10. The range hood of claim 9, wherein: the plane where the air outlet (31) of the volute is located is horizontally arranged, and the included angle between the plane where the air outlet (31) of the volute is located and the plane where the front wall plate (12) of the volute front cover (1) is theta 1 ，10°≤θ 1 ≤30°。
11. The range hood of claim 10, wherein: the included angle between a front wall plate (12) of the front volute cover (1) and a first inclined part (13) which is connected to the lower end of the front wall plate (12) and inclined towards the rear volute cover (2) from top to bottom is theta 2 The included angle between a rear wall plate (22) of the volute rear cover (2) and a second inclined part (23) which is connected to the lower end of the rear wall plate (22) and inclined towards the volute front cover (1) from top to bottom is theta 3 The included angle between the panel (41) and the top wall plate of the shell (4) is marked as theta 4 ，θ 3 =θ 1 ，θ 2 <θ 4 ；
The vertical distance between the central point (O) of the molded line and the starting point of the volute tongue section is L 1 Vertical distance L of said centre point (O) from the bottom of the profile 4 The vertical distance from the top end of the first tangent plane (32) to the bottom of the molded line is L 2 The vertical distance from the top end of the second tangent plane (33) to the bottom of the molded line is L 3 The distance satisfies the following condition: l is a radical of an alcohol 4 - L 3 ≥R 2 、L 2 / L 3 =k* L 4 / L 1 The value range of k is 0.8 to 0.9; the rear air inletThe contour line of the opening (21) is partially a vertical section (24) extending vertically, and the length of the vertical section (24) of the rear air inlet (21) is L 7 ，L 7 T is more than or equal to 2t, and t is the minimum radial distance between the impeller (5) and the volute annular wall (3).
CN202110361336.0A 2021-04-02 2021-04-02 Volute for range hood, fan system and range hood Active CN113513501B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100341837B1 (en) * 1999-08-10 2002-06-24 구자홍 Blower
CN103711730B (en) * 2012-09-29 2016-05-04 芜湖美的厨卫电器制造有限公司 Spiral case, the blower fan with this spiral case and range hood
CN105041722B (en) * 2015-08-26 2017-08-29 宁波方太厨具有限公司 A kind of centrifugal blower volute
CN107975497B (en) * 2017-05-23 2024-04-02 宁波方太厨具有限公司 Centrifugal fan spiral case
CN207064330U (en) * 2017-08-06 2018-03-02 中山市致静电器科技有限公司 A kind of centrifugal blower volute of range hood
CN208605401U (en) * 2018-06-28 2019-03-15 九阳股份有限公司 A kind of spiral case component of kitchen ventilator
CN208536094U (en) * 2018-07-25 2019-02-22 杭州老板电器股份有限公司 Variable cross-section air duct and range hood

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