CN210106248U - Volute of centrifugal fan for range hood and centrifugal fan applied by volute - Google Patents
Volute of centrifugal fan for range hood and centrifugal fan applied by volute Download PDFInfo
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- CN210106248U CN210106248U CN201920609460.2U CN201920609460U CN210106248U CN 210106248 U CN210106248 U CN 210106248U CN 201920609460 U CN201920609460 U CN 201920609460U CN 210106248 U CN210106248 U CN 210106248U
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Abstract
The utility model discloses a spiral case for range hood's centrifugal fan, its characterized in that: the molded line of the volute comprises a first straight line, an arc, a first curve, a second straight line, a third curve, a fourth curve and a third straight line which are connected smoothly in sequence, an air outlet of the volute is corresponding to the position between the starting point of the first straight line and the end point of the third straight line, and the arc corresponds to the volute tongue of the volute. The centrifugal fan with the volute is further disclosed.
Description
Technical Field
The utility model relates to an oil smoke clarification plant, especially a centrifugal fan's spiral case for range hood to and the centrifugal fan that this spiral case was used.
Background
Along with the change of living environment of people and the improvement of life quality, the requirements on the range hood are higher and higher. The fan that domestic range hood adopted mostly is multi-wing centrifugal fan, inhales, exhausts. Centrifugal fans generally consist of a volute, a motor, an impeller, etc. The working principle of the centrifugal fan is that the motor drives the impeller to rotate to apply work to airflow and the airflow is discharged from the radial direction through the diffusion effect of the volute.
The volute molded line of the centrifugal fan for the range hood disclosed in the chinese patent with the application number of 201110118687.5 is formed by smoothly and transitionally connecting a first straight line, a first arc line, a second arc line, a spiral line and a second straight line, wherein the spiral line is a constant-speed spiral line; also, as disclosed in the chinese patent with application No. 201220245605.3, a volute structure of a double-sided air inlet range hood includes an air outlet fixing plate, a volute front plate and a volute rear plate which are arranged in parallel, and a volute side plate for connecting the volute front plate and the volute rear plate, where the volute front plate and the volute rear plate are both provided with circular air inlets, and an edge contour line of the volute front plate includes a first straight line, a second straight line, a first arc, a second arc, a third straight line, a third arc, a fourth arc, a fifth arc, a fourth straight line, and a fifth straight line which are connected in sequence; the fifth straight line is in contact with the air outlet fixing plate, and the second straight line and the third straight line are both vertical to the fifth straight line; the contour of the volute back plate is consistent with that of the volute front plate, and all points are in one-to-one correspondence.
However, the design theory of the multi-wing centrifugal fan is not complete enough, and the industrial application is not pure enough, so that the performance of the range hood adopting the fan system at present is often unsatisfactory in terms of wind pressure, wind volume and the like. Along with the demand of the market on the air quantity and the air pressure of the range hood, the kinetic energy of fluid in the volute needs to be increased synchronously, and the increase of turbulent kinetic energy and the like caused by the increase of the kinetic energy of fluid in the volute enables the vortex to be generated in the volute more easily, so that the noise is increased more and more, and the expectation of a user on the noise value during actual use is difficult to meet.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the first technical problem that will solve is to the problem that above-mentioned prior art exists, provides a spiral case for range hood's centrifugal fan, can the noise reduction.
The utility model aims to solve the second technical problem that a centrifugal fan who has above-mentioned spiral case is provided to use.
The utility model provides a technical scheme that above-mentioned first technical problem adopted does: the utility model provides a spiral case for range hood's centrifugal fan which characterized in that: the molded line of the volute comprises a first straight line, an arc, a first curve, a second straight line, a third curve, a fourth curve and a third straight line which are connected smoothly in sequence, an air outlet of the volute is corresponding to the position between the starting point of the first straight line and the end point of the third straight line, and the arc corresponds to the volute tongue of the volute.
In order to enable the noise of the impeller in the volute to be as small as possible under the same rotating speed, in order to reasonably collect the air quantity and comprehensively consider the position of the outer decorative cover of the fan, the molded line has a center, a vertical line passing through the center is taken as a Y axis, the included angle between the first straight line and the Y axis is 25-45 degrees, and the included angle between the third straight line and the Y axis is 10-20 degrees.
In order to prevent the noise from being too large and not influencing the function after oil accumulation, the radius of the circular arc is 6-20 mm.
In order to guide the fluid to flow smoothly, the terminal point of the second curve is connected with the starting point of the second straight line through a first round corner in a smooth transition mode, and the terminal point of the second straight line is connected with the starting point of the third curve through a second round corner in a smooth transition mode.
For avoiding the fillet too little noise grow, too can influence the curved function originally greatly, the radius of first fillet is 40 ~ 80mm, the radius of second fillet is 40 ~ 80 mm.
In order to facilitate the collection of the airflow and not easily generate the airflow peeling of the inner annular wall, the molded line has a center, a coordinate system is established by taking a horizontal line passing through the center as an X axis and a vertical line passing through the center as a Y axis, and the coordinate values of reference lines of a first curve, a second straight line, a third curve and a fourth curve of the volute molded line are as follows:
| angle of rotation | Radius of | Angle of rotation | Radius of | Angle of rotation | Radius of | Angle of rotation | Radius of | Angle of rotation | Radius of |
| -25.3° | 141.57 | 40° | 150.78 | 110° | 163.15 | 180° | 193.06 | 250° | 218.98 |
| -20° | 142.35 | 50° | 152.66 | 120° | 171.19 | 190° | 197.36 | 260° | 222.6 |
| -10° | 143.87 | 60° | 155.03 | 130° | 174.37 | 200° | 201.32 | 270° | 226.6 |
| 0° | 145.38 | 70° | 157.46 | 140° | 177.73 | 210° | 204.68 | 280° | 230.03 |
| 10° | 146.82 | 80° | 155.67 | 150° | 181.28 | 220° | 208.14 | 290.8° | 233.99 |
| 20° | 148.18 | 90° | 154.31 | 160° | 185.02 | 230° | 211.7 | ||
| 30° | 149.51 | 100° | 155.67 | 170° | 188.94 | 240° | 215.31 |
And a point with an angle of-25.3 degrees is the starting point of the first curve, a point with an angle of 290.8 degrees is the end point of the fourth curve, adjacent points are connected through a quadratic spline curve, and 0.8-1.5 times of a line obtained by combining the datum line with the first straight line, the circular arc and the third straight line is the molded line of the volute.
In order to save noise reduction materials, the curve equations of the second curve and the third curve are the same.
The utility model provides a technical scheme that above-mentioned first technical problem adopted does: the centrifugal fan with the volute is characterized in that: the molded line is provided with a center, and the center of the impeller of the centrifugal fan is offset for a certain distance in the direction far away from the center of the circular arc on the connecting line of the center of the circular arc and the center of the molded line.
Compared with the prior art, the utility model has the advantages of: by reasonably arranging the line segment structure of the molded line, the oil smoke gas flow can be reduced and better guided, so that the noise is reduced; the air quantity can be reasonably collected by setting the angles of the initial straight line section and the final straight line section, so that the noise is further reduced; the oil smoke gas flow can be guided to flow smoothly through the round corner transition between the two curves and the straight line section, so that the noise is further reduced; by reasonably setting the coordinates of all curves, the airflow collection is convenient and the airflow peeling of the inner annular wall is not easy to generate; by offsetting the impeller center relative to the volute center, wind noise can be further reduced.
Drawings
Fig. 1 is a schematic profile view of a volute according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Referring to fig. 1, the profile of the volute for the centrifugal fan of the range hood includes a first straight line L1 (the starting point is a, the end point is b), an arc L2 (the starting point is b, the end point is c), a first curve L3 (the starting point is c, the end point is d), a second curve L4 (the starting point is d, the end point is e), a second straight line L5 (the starting point is f, the end point is g), a third curve L6 (the starting point is h, the end point is i), a fourth curve L7 (the starting point is i, the end point is j), and a third straight line L8 (the starting point is j, the end point is k) which are smoothly connected in sequence. The profile has a center O. The distance between the starting point of the first straight line L1 and the end point of the third straight line L8 corresponds to the air outlet of the volute, and the circular arc L2 corresponds to the volute tongue of the volute. The line segments form a spiral volute molded line. The vertical installation of the centrifugal fan (the air inlet is horizontal and the air outlet is vertical) is taken as a standard, a horizontal line passing through the center O is an X axis, and a vertical line passing through the center O is a Y axis.
In order to reduce noise as much as possible under the same rotating speed of the impeller in the volute and reasonably collect air volume and comprehensively consider the position of a decorative cover outside the fan, preferably, an included angle α between a first straight line L1 and a Y axis is 25-45 degrees, and an included angle α between a third straight line L3 and the Y axis is 10-20 degrees.
The second curve L4 and the third curve L6 are separated by a second straight line L5, the end point of the second curve L4 and the start point of the second straight line L5 are connected by a first rounded corner R1 in a smooth transition manner, and the end point of the second straight line L5 and the start point of the third curve L6 are connected by a second rounded corner R2 in a smooth transition manner. The second curve L4 and the third curve L5 adopt the same equation curve, so that noise reduction and material saving are facilitated, and the two round corners play a role in guiding the fluid to flow smoothly. Because the existence of the first round angle R1 and the second circular arc R2 influences the fluid flow and the noise, the reasonable value has great influence on the wind noise of the volute. If the noise is too small, the noise becomes larger, and if the noise is too large, the function of the original curve is influenced. Preferably, the radius of the first round corner R1 is 40-80 mm, and the radius of the second round corner R2 is 40-80 mm.
The coordinate values of the first curve L3, the second curve L4, the second straight line L5, the third curve L6 and the fourth curve L7 of the volute profile are shown in table 1.
TABLE 1 coordinate values of points of each curve of the volute profile
The coordinate axes are formed by the above-mentioned X and Y axes, wherein a point of an angle of-25.3 ° is a start point c of the first curve L3, and a point of an angle of 290.8 ° is an end point j of the fourth curve L7. And adjacent points are connected through a secondary spline curve. The first curve L3, the second curve L4, the second straight line L5, the third curve L6 and the fourth curve L7 obtained in the above way can facilitate airflow collection and are not easy to generate airflow stripping of the inner annular wall.
The formed curves are combined with straight lines, circular arcs and round corners to form a base line, and the base line can be expanded and reduced by 0.8-1.5 times properly to obtain the molded line of the volute.
When the volute is applied to a centrifugal fan, the line connecting the center O' of the circular arc L2 and the center O "(or the center of the motor, or the center of the opening at the rear of the volute) of the impeller is offset, which is a good help for wind noise, and the boundary line of the impeller is shown by a dotted line. The impeller center O ″ is offset by a distance d0 in a direction away from the center O 'of the arc L2 on a line connecting the center O' of the arc L2 and the volute-shaped wire center O.
Claims (8)
1. The utility model provides a spiral case for range hood's centrifugal fan which characterized in that: the molded line of the volute comprises a first straight line (L1), an arc (L2), a first curve (L3), a second curve (L4), a second straight line (L5), a third curve (L6), a fourth curve (L7) and a third straight line (L8), wherein the first straight line, the second straight line, the third straight line and the third straight line are connected in sequence in a smooth mode, an air outlet of the volute corresponds to the position between a starting point (a) of the first straight line (L1) and an end point (k) of the third straight line (L8), and the arc (L2) corresponds to a volute tongue of the volute.
2. The volute of the centrifugal fan for the range hood according to claim 1, wherein the molded line has a center (O), a vertical line passing through the center (O) is taken as a Y axis, an included angle (α 1) between the first straight line (L1) and the Y axis is 25-45 degrees, and an included angle (α 2) between the third straight line (L8) and the Y axis is 10-20 degrees.
3. The volute of a centrifugal fan for a range hood according to claim 1, wherein: the radius of the circular arc (L2) is 6-20 mm.
4. The volute of a centrifugal fan for a range hood according to claim 1, wherein: the terminal (e) of the second curve (L4) and the starting point (f) of the second straight line (L5) are in smooth transition connection through a first fillet (R1), and the terminal (g) of the second straight line (L5) and the starting point (h) of the third curve (L6) are in smooth transition connection through a second fillet (R2).
5. The volute of a centrifugal fan for a range hood according to claim 4, wherein: the radius of the first fillet (R1) is 40-80 mm, and the radius of the second fillet (R2) is 40-80 mm.
6. The volute of a centrifugal fan for a range hood according to claim 1, wherein: the molded line has a center (O), a coordinate system is established by taking a horizontal line passing through the center (O) as an X axis and a vertical line passing through the center (O) as a Y axis, and coordinate values of reference lines of a first curve (L3), a second curve (L4), a second straight line (L5), a third curve (L6) and a fourth curve (L7) of the molded line of the volute are as follows:
The point with the angle of-25.3 degrees is the starting point (c) of the first curve (L3), the point with the angle of 290.8 degrees is the terminal point (j) of the fourth curve (L7), adjacent points are connected through a quadratic spline curve, and 0.8-1.5 times of a line obtained by combining the datum line with the first straight line (L1), the arc (L2) and the third straight line (L8) is the molded line of the volute.
7. The volute of the centrifugal fan for the range hood according to any one of claims 1 to 6, wherein: the curve equations of the second curve (L4) and the third curve (L6) are the same.
8. A centrifugal fan using the volute of any one of claims 1 to 7, wherein: the molded line has a center (O), and the impeller center (O ') of the centrifugal fan is offset by a certain distance in the direction away from the center (O ') of the circular arc (L2) on the connecting line of the center (O ') of the circular arc (L2) and the molded line center (O).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920609460.2U CN210106248U (en) | 2019-04-29 | 2019-04-29 | Volute of centrifugal fan for range hood and centrifugal fan applied by volute |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920609460.2U CN210106248U (en) | 2019-04-29 | 2019-04-29 | Volute of centrifugal fan for range hood and centrifugal fan applied by volute |
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| CN210106248U true CN210106248U (en) | 2020-02-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030210A (en) * | 2019-04-29 | 2019-07-19 | 宁波方太厨具有限公司 | A kind of spiral case of the centrifugal blower for range hood and its centrifugal blower of application |
| CN111852912A (en) * | 2020-07-17 | 2020-10-30 | 青岛海信日立空调系统有限公司 | Fan coil |
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2019
- 2019-04-29 CN CN201920609460.2U patent/CN210106248U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030210A (en) * | 2019-04-29 | 2019-07-19 | 宁波方太厨具有限公司 | A kind of spiral case of the centrifugal blower for range hood and its centrifugal blower of application |
| CN110030210B (en) * | 2019-04-29 | 2024-01-16 | 宁波方太厨具有限公司 | Volute for centrifugal fan of range hood and centrifugal fan using same |
| CN111852912A (en) * | 2020-07-17 | 2020-10-30 | 青岛海信日立空调系统有限公司 | Fan coil |
| CN111852912B (en) * | 2020-07-17 | 2021-12-07 | 青岛海信日立空调系统有限公司 | Fan coil |
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