CN114396392A - Volute assembly, centrifugal fan and range hood - Google Patents
Volute assembly, centrifugal fan and range hood Download PDFInfo
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- CN114396392A CN114396392A CN202111567417.2A CN202111567417A CN114396392A CN 114396392 A CN114396392 A CN 114396392A CN 202111567417 A CN202111567417 A CN 202111567417A CN 114396392 A CN114396392 A CN 114396392A
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- volute
- wind wheel
- curved surface
- cover plate
- side curved
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- 230000002829 reductive effect Effects 0.000 claims abstract description 20
- 230000007423 decrease Effects 0.000 claims description 10
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- 230000009286 beneficial effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 241000237858 Gastropoda Species 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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Classifications
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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
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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
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
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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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- 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
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- 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
Abstract
The application discloses a volute component, a centrifugal fan and a range hood, wherein the volute component comprises a volute and a volute tongue, the volute tongue and the volute are enclosed to form a wind wheel cavity and an air outlet communicated with the wind wheel cavity, the wind wheel cavity is used for installing a wind wheel, and the volute tongue comprises an air outlet side curved surface facing the air outlet and a wind wheel side curved surface facing a wind wheel; the air outlet side curved surface is connected with the wind wheel side curved surface, and a slow flow convex part is arranged on the wind wheel side curved surface. According to the technical scheme, the slow flow convex part is arranged on the side curved surface of the wind wheel of the volute tongue to block the air flow flowing back slowly, so that the noise is reduced.
Description
Technical Field
The application relates to the technical field of range hoods, in particular to a volute component, a centrifugal fan and a range hood.
Background
In the related art, in order to reduce the impact of the airflow on the volute tongue, an inwards concave structure is generally arranged on the air outlet side of the volute tongue, and the inwards concave structure is selected to delay the impact of the airflow on the volute tongue, so that the purpose of reducing noise is achieved. However, when the air outlet side of the volute tongue is provided with the concave structure, a part of air flow flows back to the wind wheel cavity and collides with the wind wheel, and accordingly large noise is generated.
Disclosure of Invention
The main purpose of this application is to provide a spiral case subassembly, and the wind wheel side curved surface that aims at the volute tongue is equipped with the unhurried current convex part to hinder the air current of unhurried current, thereby reduce the noise.
In order to achieve the above object, the present application provides a volute assembly, which includes a volute and a volute tongue, wherein the volute tongue and the volute enclose to form a wind wheel cavity and an air outlet communicated with the wind wheel cavity, the wind wheel cavity is used for installing a wind wheel, and the volute tongue includes an air outlet side curved surface facing the air outlet and a wind wheel side curved surface facing the wind wheel; the air outlet side curved surface is connected with the wind wheel side curved surface, and a slow flow convex part is arranged on the wind wheel side curved surface.
Optionally, the flow relief projection extends in a circumferential direction of the volute tongue.
Optionally, the distance between the slow flow convex part and the wind wheel is in a decreasing arrangement from the middle of the slow flow convex part to the side of the slow flow convex part.
Optionally, the distance between the slow flow convex part and the wind wheel is reduced from the air outlet side curved surface along the circumferential direction of the volute tongue.
And/or the width of the slow flow convex part along the height direction of the volute tongue is reduced from the air outlet side curved surface along the circumferential direction of the volute tongue.
Optionally, the volute comprises a first cover plate, a second cover plate, and a volute side plate disposed between the first cover plate and the second cover plate, and the volute tongue is disposed between the first cover plate and the second cover plate and connected to the volute side plate.
Optionally, the distance between the first cover plate and the second cover plate is H, and the distance between the highest point of the slow flow convex part and the second cover plate is d1, wherein 1/3H ≦ d1 ≦ 1/2H.
Optionally, a distance between the first cover plate and the second cover plate is H, a concave portion is recessed from the air outlet side curved surface towards the side away from the air outlet, and a distance between a lowest point of the concave portion and the second cover plate is d2, where d2 is equal to or greater than 1/4H and equal to or less than 1/2H.
Optionally, the air outlet side curved surface is provided with air expanding parts positioned at two sides of the concave part, the air expanding parts are provided with flow guide surfaces, and an included angle between the flow guide surfaces and the length direction of the volute tongue is alpha; wherein 85 ° < α <105 °.
Optionally, the slow flow convex part is a plurality of slow flow convex blocks arranged on the wind wheel side curved surface.
Optionally, the volute tongue further comprises a connecting cambered surface, and the connecting cambered surface is smoothly connected with the air outlet side curved surface and the wind wheel side curved surface.
Optionally, the connecting arc surface and a plane perpendicular to the height direction of the volute tongue form an intersecting arc line, and the radius of a circle corresponding to the intersecting arc line is R; wherein R is more than or equal to 11.5mm and less than or equal to 19.0 mm.
Optionally, the first cover plate is provided with a first air inlet, and the second cover plate is provided with a second air inlet.
Optionally, the width of the volute is B, and the length of the volute tongue is L; wherein L/B > 0.6.
The application also provides a centrifugal fan, which comprises a wind wheel and the volute component, wherein the centrifugal wind wheel is arranged in a wind wheel cavity of the volute component, the volute component comprises a volute and a volute tongue, the volute tongue and the volute are enclosed to form a wind wheel cavity and an air outlet communicated with the wind wheel cavity, the wind wheel cavity is used for mounting a wind wheel, and the volute tongue comprises an air outlet side curved surface facing the air outlet and a wind wheel side curved surface facing the wind wheel; the air outlet side curved surface is connected with the wind wheel side curved surface, and a slow flow convex part is arranged on the wind wheel side curved surface.
The application also provides a range hood, which comprises the centrifugal fan, wherein the centrifugal fan comprises a wind wheel and the volute component, the centrifugal wind wheel is installed in a wind wheel cavity of the volute group, the volute component comprises a volute and a volute tongue, the volute tongue and the volute surround to form the wind wheel cavity and an air outlet communicated with the wind wheel cavity, the wind wheel cavity is used for installing a wind wheel, and the volute tongue comprises an air outlet side curved surface facing the air outlet and a wind wheel side curved surface facing the wind wheel; the air outlet side curved surface is connected with the wind wheel side curved surface, and a slow flow convex part is arranged on the wind wheel side curved surface.
According to the technical scheme, the volute and the volute tongue are arranged, so that the volute tongue and the volute are surrounded to form a wind wheel cavity and an air outlet communicated with the wind wheel cavity, the wind wheel cavity is used for installing a wind wheel, the volute tongue further comprises an air outlet side curved surface facing the air outlet and a wind wheel side curved surface facing the wind wheel, the air outlet side curved surface is connected with the wind wheel side curved surface, and a slow flow convex part is arranged on the wind wheel side curved surface; therefore, when the reflowed airflow enters the wind wheel cavity from the air outlet side curved surface, the slow flow convex part is arranged on the wind wheel side curved surface, the slow flow convex part plays a role in slowing the reflowed airflow, the intensity of impact of the reflowed airflow on the impeller is weakened, and therefore noise generated when the reflowed airflow collides with the wind wheel is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application 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, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural view of an embodiment of a volute assembly of the present application;
FIG. 2 is a schematic structural view of a portion of the components of FIG. 1;
FIG. 3 is a top view of the volute assembly of FIG. 1;
FIG. 4 is a top view of the volute assembly of FIG. 1;
FIG. 5 is a top view of the volute assembly of FIG. 1;
FIG. 6 is a schematic view of the volute tongue of FIG. 1;
FIG. 7 is a schematic view of the volute tongue of FIG. 1 from another perspective;
FIG. 8 is a schematic view of the volute tongue of FIG. 1 from a further perspective;
FIG. 9 is a front view of the volute tongue of FIG. 6;
FIG. 10 is a top view of the volute tongue of FIG. 6;
FIG. 11 is a front view of the volute tongue of FIG. 6;
fig. 12 is a cross-sectional view taken along line a-a of fig. 11.
The reference numbers illustrate:
the objectives, features, and advantages of the present application will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are referred to in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
Referring to fig. 1 and fig. 2, the present application provides an embodiment of a volute assembly 10, where the volute assembly 10 is suitable for mounting a wind wheel 300, for example, the wind wheel 300 can be mounted in a range hood through the volute assembly 10, so that the range hood can work normally. In the following embodiments, the volute assembly 10 will be described by mainly taking the case of being adapted to configure the wind turbine 300 to the volute assembly 10, and other cases requiring the volute assembly 10 may be referred to as implementation.
Referring to fig. 1, 6 and 7, in an embodiment of the volute assembly 10 of the present application, the volute assembly 10 includes a volute 100 and a volute tongue 200, wherein the volute tongue 200 and the volute 100 surround to form a wind wheel cavity 101 and a wind outlet 102 communicated with the wind wheel cavity 101, the wind wheel cavity 101 is used for mounting a wind wheel 300, and the volute tongue 200 includes a wind outlet side curved surface 201 facing the wind outlet 102 and a wind wheel side curved surface 202 facing the wind wheel 300; the wind outlet side curved surface 201 is connected with the wind wheel side curved surface 202, and the wind wheel side curved surface 202 is provided with a slow flow convex part 202 a.
Specifically, in the present embodiment, the wind wheel 300 is a centrifugal wind wheel 300, the centrifugal wind wheel 300 is installed in the wind wheel cavity 101, and of course, the volute assembly 10 may have an air inlet according to actual conditions. When the wind wheel 300 operates, negative pressure can be generated in the wind wheel cavity 101, so that air is sucked into the wind wheel cavity 101, and then driven by the wind wheel 300, the air is discharged from the air outlet 102, in the process, the volute tongue 200 is used for intercepting flow, and the wind wheel 300 is prevented from driving airflow to rotate in the wind wheel cavity 101 and not to exit from the air outlet 102. After the airflow is intercepted by the volute tongue 200 and the rotation speed of the wind wheel 300 is high, the pressure at the air outlet 102 is high, and when the airflow collides with the air outlet side curved surface 201, a part of the airflow flows back to the wind wheel cavity 101 to collide with the wind wheel 300, so that high noise is generated.
When the backflow airflow enters the wind wheel cavity 101 from the air outlet side curved surface 201, the slow flow convex part 202a is arranged on the wind wheel side curved surface 202, the slow flow convex part 202a plays a role in slowing the backflow airflow, the impact intensity of the backflow airflow on the impeller is weakened, and therefore noise generated when the backflow airflow collides with the wind wheel 300 is reduced.
There are various shapes of the slow flow protrusion 202a, for example, the slow flow protrusion 202a is a protrusion that the wind wheel side curved surface 202 protrudes toward the wind wheel cavity 101; alternatively, the slow flow convex portion 202a may be a convex block that is convexly arranged in the wind wheel side curved surface 202 facing the wind wheel cavity 101; alternatively, the slow-flow protrusion 202a may also be a bulge protruding from the wind wheel side curved surface 202 toward the wind wheel cavity 101, which is not limited herein. The relief projection 202a functions to retard the air flow of the return flow, so the shape of the relief projection 202a can be designed appropriately according to the actual situation. It is noted that the slow flow protrusion 202a should not completely block the backflow airflow from flowing back into the wind wheel cavity 101, and the backflow airflow is prevented from hitting the slow flow protrusion 202a to generate more noise.
As for the manufacturing and assembling relationship between the volute 100 and the volute tongue 200, in the present embodiment, in order to save the assembling process and save the cost, the volute tongue 200 is integrally formed and then detachably connected to the volute 100, for example, the volute tongue 200 and the volute 100 may be connected by a screw connection, a snap connection, or the like. The detachable connection of the volute tongue 200 and the volute 100 facilitates the adaptation of the wind wheel 300, and the wind wheel 300 can be installed in the volute assembly 10 by selecting a proper wind wheel 300.
According to the technical scheme, the volute 100 and the volute tongue 200 are arranged, so that the volute tongue 200 and the volute 100 are surrounded to form the wind wheel cavity 101 and the air outlet 102 communicated with the wind wheel cavity 101, the wind wheel cavity 101 is used for installing a wind wheel 300, the volute tongue 200 further comprises an air outlet side curved surface 201 facing the air outlet 102 and a wind wheel side curved surface 202 facing the wind wheel 300, the air outlet side curved surface 201 is connected with the wind wheel side curved surface 202, and the wind wheel side curved surface 202 is provided with a slow flow convex part 202 a; therefore, when the reflowing airflow enters the wind wheel cavity 101 from the air outlet side curved surface 201, the slow flow convex part 202a is arranged on the wind wheel side curved surface 202, the slow flow convex part 202a plays a role in slowing the reflowing airflow, the impact intensity of the reflowing airflow on the impeller is weakened, and the noise generated when the reflowing airflow collides with the wind wheel 300 is reduced.
In one embodiment, the relief lobe 202a extends circumferentially of the volute tongue 200. That is, the slow flow protrusion 202a extends from the curved surface 201 close to the air outlet side to a direction away from the curved surface 201 on the air outlet side. Further, in an embodiment, the scroll casing 100 includes a first cover plate 110 and a second cover plate 120, and a scroll side plate 130 disposed between the first cover plate 110 and the second cover plate 120, and the scroll tongue 200 is disposed between the first cover plate 110 and the second cover plate 120 and connected to the scroll side plate 130, such that the slow flow protrusion 202a forms the first flow guide 103 with the first cover plate 110, and the slow flow protrusion 202a forms the second flow guide 104 with the second cover plate 120. Of course, the slow flow convex portion 202a is to be provided on the wind wheel-side curved surface 202. Since the first flow guide channel 103 is formed by enclosing the first cover plate 110 and the slow flow protrusion 202a, the first flow guide channel 103 also extends in the circumferential direction of the volute tongue 200; since second flow leader 104 is formed by second cover plate 120 and turbulence relief 202a enclosing, second flow leader 104 also extends in the circumferential direction of volute tongue 200.
It is understood that the slow flow protrusion 202a is disposed between the first cover plate 110 and the second cover plate 120, that is, the slow flow protrusion 202a forms a channel with the first cover plate 110 and the second cover plate 120, so that the slow flow protrusion 202a forms the first flow guide 103 with the first cover plate 110 and the slow flow protrusion 202a forms the second flow guide 104 with the second cover plate 120.
When the returned airflow is respectively divided and flows into the first flow guide channel 103 and the second flow guide channel 104, the divided airflow flows along the circumferential extending direction of the volute tongue 200 and collides with the first cover plate 110, the second cover plate 120 and the slow flow convex portion 202a, so that the flowing speed of the divided airflow is reduced, and the noise generated by collision between the divided airflow and the impeller is reduced. It should be noted that, since the first cover plate 110, the second cover plate 120 and the slow flow protrusion 202a are stationary, the noise generated by the collision of the branched airflow with the first cover plate 110, the second cover plate 120 and the slow flow protrusion 202a is almost negligible.
After the backflow air flow is retarded by the retarded flow convex portion 202a, the retarded flow convex portion 202a divides the backflow air flow, so that the backflow air flow passes through both sides of the retarded flow convex portion 202a, that is, the backflow air flow passes through the first flow guide channel 103 and the second flow guide channel 104, thereby reducing the flow rate of the backflow air flow hitting the wind wheel 300. It can be understood that the middle speed of the wind wheel 300 is higher, the speeds of both sides of the wind wheel 300 are lower than the speed of the middle of the wind wheel 300, and after the backflow air flow is retarded by the retarding convex portion 202a, the speed of the backflow air flow can be retarded, and the backflow air flow can be branched.
After the returned airflow is split, only a small part of the airflow flows through the slow flow convex part 202a, but the airflow quantity and the speed of the part of the airflow are low, and even if the part of the airflow collides with the wind wheel 300, no large noise is generated; most of the returned airflow flows through the first flow guide channel 103 and the second flow guide channel 104, if the returned airflow is not split, the returned airflow is split and then collides with the wind wheel 300, and then the noise generated by the collision of the returned airflow and the wind wheel 300 is small, so that the noise generated by the collision of the returned airflow and the wind wheel 300 is reduced.
Referring to fig. 11 and 12, in another embodiment, the distance between the slow flow convex portion 202a and the wind wheel 300 decreases from the middle portion 202b of the slow flow convex portion 202a to the side portion 202c of the slow flow convex portion 202a, so that the widths of the first flow guide channel 103 and the second flow guide channel 104 become larger. When the areas of the first flow guide channel 103 and the second flow guide channel 104 become larger, the contact area between the first flow guide channel 103 and the second flow guide channel 104 and the backflow air flow is increased, so that the first flow guide channel 103 and the second flow guide channel 104 can accommodate more backflow air flows, the backflow air flow is reduced to flow through the middle part 202b of the slow flow bump, and the impact between the backflow air flow and the wind wheel 300 is reduced. It should be noted that, in the present embodiment, the middle portion 202b and the side portion 202c of the slow flow protrusion 202a are positions where arrows point to the volute tongue 200 specifically, and when the volute tongue 200 is placed at different positions, the positions of the middle portion 202b and the side portion 202c of the slow flow protrusion 202a change accordingly, which is for the convenience of the reader and is not limited specifically.
Referring to fig. 9, in a preferred embodiment, the distance between the slow flow protrusion 202a and the wind wheel 300 decreases from the air-out side curved surface 201 along the circumferential direction of the volute tongue 200; and/or the width of the slow flow convex part 202a along the height direction of the volute tongue 200 is reduced from the air outlet side curved surface 201 along the circumferential direction of the volute tongue 200. It should be noted that in the present embodiment, the height direction of the volute tongue 200 is the direction indicated by the specific arrow in the figure, and when the volute tongue 200 is placed at different positions, the height direction of the volute tongue 200 changes accordingly, and this description is for the convenience of the reader and is not limited specifically.
Specifically, the distance between the slow flow protruding portion 202a and the wind wheel 300 is set to decrease from the air-out side curved surface 201 along the circumferential direction of the volute tongue 200, that is, the position of the slow flow protruding portion 202a close to the air-out side curved surface 201 has a minimum gap with the wind wheel 300, so that the pressure at this position is relatively large, the pressure at this position opposes to the pressure of the backflow air, and the velocity of the backflow air is weakened, thereby reducing the noise generated by the collision between the backflow air and the wind wheel 300, further, the distance between the slow flow protruding portion 202a and the wind wheel 300 is set to decrease from the air-out side curved surface 201 along the circumferential direction of the volute tongue 200, so that the pressure between the slow flow protruding portion 202a and the wind wheel 300 is also set to decrease from the air-out side curved surface 201 along the circumferential direction of the volute tongue 200, further, the depth of the first flow guide channel 103 and the second flow guide channel 104 is set to decrease gradually from the air-out side curved surface 201 along the circumferential direction of the volute tongue 200, so that the wind wheel 300 extrudes the diverted air from the gap between the volute 100 and the volute tongue 200, thereby reducing the loss of air flow.
Alternatively, the width of the slow flow protrusion 202a in the height direction of the volute tongue 200 is reduced from the air-outlet side curved surface 201 in the circumferential direction of the volute tongue 200. That is to say, the widths of the first flow guiding channel 103 and the second flow guiding channel 104 are gradually increased from the air-out side curved surface 201 along the circumferential direction of the volute tongue 200, so that the speed of the divided air flow is gradually reduced, and the noise generated by the collision of the divided air flow and the wind wheel 300 is reduced.
Or, the distance between the slow flow convex portion 202a and the wind wheel 300 decreases from the air-out side curved surface 201 along the circumferential direction of the volute tongue 200, and the width of the slow flow convex portion 202a along the height direction of the volute tongue 200 decreases from the air-out side curved surface 201 along the circumferential direction of the volute tongue 200. So, the depth of first water conservancy diversion way 103 and second water conservancy diversion way 104 is the diminishing setting from air-out side curved surface 201 along the circumference of snail tongue 200 gradually to, the width of first water conservancy diversion way 103 and second water conservancy diversion way 104 is the crescent setting from air-out side curved surface 201 along the circumference of snail tongue 200, not only reduces the produced sound of air current and the wind wheel 300 striking of backward flow, can also reduce the loss of the air current of backward flow.
Referring to fig. 9, in another preferred embodiment, the volute tongue 200 assembly is generally used in a blower, which is a centrifugal blower having two inlets, the first cover plate 110 has a first inlet 111, and the second cover plate 120 has a second inlet 121. The first air inlet 111 is provided with the collecting ring 140, the second air inlet 121 is provided with the wind wheel frame 150, and the wind wheel 300 and the motor of the centrifugal fan are mounted on the wind wheel frame 150, so that when the wind wheel 300 operates, airflow enters from the first air inlet 111 and the second air inlet 121, but because the motor and the wind wheel frame 150 can shield a part of the airflow entering from the first air inlet 111, the pressure of the position, close to the second cover plate 120, of the wind wheel cavity 101 is lower, so that the airflow with higher speed discharged by the wind wheel 300 is close to the second cover plate 120, and further, the backflow airflow with higher speed is close to the second cover plate 120. In view of this, the distance between the first cover plate 110 and the second cover plate 120 is H, and the distance between the highest point of the slow flow protrusion 202a and the second cover plate 120 is d1, wherein 1/3H ≦ d1 ≦ 1/2H. In this way, the slow flow protrusion 202a may block the backflow airflow having a high speed, thereby reducing noise generated by the backflow airflow colliding with the wind wheel 300.
Similar to the above embodiments, in one embodiment, the air-out side curved surface 201 is recessed with a concave portion 201a towards the side far away from the air outlet 102, and the distance between the lowest point of the concave portion 201a and the second cover plate 120 is d2, wherein d2 is equal to or greater than 1/4H and equal to or less than 1/2H. Specifically, the recess 201a has a certain depth, which can reduce the speed, thereby reducing the noise generated by the airflow and the air-out side curved surface 201. In addition, the range of d2 is 1/4H-2-1/2H, which is beneficial for the wind wheel 300 to hit the air flow with high speed on the concave part 201a, thereby reducing the noise generated by the air flow and the air-out side curved surface 201.
Referring to fig. 8 and 10, further, in an embodiment, the air outlet side curved surface 201 is provided with air diffuser 201b located at two sides of the concave portion 201a, the air diffuser 201b has a flow guiding surface, and an included angle between the flow guiding surface and the length direction of the volute tongue 200 is α; wherein 85 ° < α <105 °. Specifically, the flow guide surface may guide the flow of air discharged from the wind wheel 300, in addition to the connection recess 201 a. It should be noted that in the present embodiment, the length direction of the tongue 200 is the direction indicated by the specific arrow in the figure, and when the tongue 200 is placed at different positions, the length direction of the tongue 200 changes accordingly, and this description is for the convenience of the reader and is not limited specifically.
In one embodiment, the slow flow protrusions 202a are a plurality of slow flow protrusions disposed on the curved surface 202 on the side of the wind wheel. Specifically, the slow flow protrusion 202a may be a plurality of slow flow soil blocks provided with the wind wheel side curved surface 202 to reduce noise generated by the collision of the returned airflow with the wind wheel 300.
Based on the above embodiment, in order to better connect the air-out side curved surface 201 and the wheel side curved surface 202, therefore, the volute tongue 200 is provided with the connecting curved surface 203, and the connecting curved surface 203 smoothly connects the air-out side curved surface 201 and the wheel side curved surface 202. Further, the connecting arc surface 203 is provided with a recess near the air-out side curved surface 201, and the connecting arc surface 203 is provided with a projection near the wind wheel side curved surface 202. Wherein, the sunken of connecting cambered surface 203 can carry out the drainage to the air current of backward flow, and the arch of connecting cambered surface 203 can hinder the air current of backward flow and slow for connect cambered surface 203 and hinder again after earlier draining the air current of backward flow and slow, thereby reach the accurate purpose of hindering slowly. In addition, the highest point of the slow flow convex part 202a of the wind wheel side curved surface 202 is arranged close to the connecting cambered surface 203, so that the optimal slow effect is achieved.
Further, in an embodiment, the connecting arc surface 203 and a plane perpendicular to the height direction of the volute tongue 200 form an intersecting arc, and the radius of a circle corresponding to the intersecting arc is R; wherein R is more than or equal to 11.5mm and less than or equal to 19.0mm, and in the range, the connecting cambered surface 203 can better smoothly connect the air-out side curved surface 201 and the air wheel side curved surface 202. In addition, the capability of guiding and resisting the backflow airflow by the connecting cambered surface 203 is enhanced
Referring to fig. 3, in one embodiment, the width of the volute 100 is B, and the length of the volute tongue 200 is L; wherein L/B > 0.6. Specifically, the size of the volute tongue 200 is large enough so that the slow flow protrusion can be arranged reasonably.
Referring to fig. 4 and 5, in an embodiment, the outer diameter of the wind wheel 300 is D, the number of blades of the wind wheel 300 is N, the depth of the recess 201a is W1, and the height of the slow flow protrusion 202a is W2; wherein W1 is not less than pi x D/2N, and/or W2 is not less than pi x D/2N. Specifically, test experiments show that when W1 is not less than pi D/2N, the impact noise of the airflow to the air outlet side curved surface 201 is obviously reduced; or when W2 is more than or equal to pi D/2N, the impact noise of the airflow to the wind wheel side curved surface 202 is obviously reduced; or when W1 is not less than pi D/2N and W2 is not less than pi D/2N, the impact noise of the airflow to the air-out side curved surface 201 and the air wheel side curved surface 202 is obviously reduced.
The present application further contemplates a centrifugal fan comprising a wind wheel 300 and the volute assembly 10 of the above-described embodiments. Wind rotor 300 is mounted in wind rotor cavity 101 of volute assembly 10. The specific structure of the volute component 10 refers to the above embodiments, and since the centrifugal fan adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.
Specifically, the type of the wind wheel 300 of the centrifugal fan is the centrifugal wind wheel 300, and when the centrifugal wind wheel 300 operates, airflow enters from the axial direction of the centrifugal wind wheel 300, then exits from the radial direction of the centrifugal wind wheel 300, and finally exits from the air outlet 102.
The application also provides a range hood, which comprises the centrifugal fan in the embodiment. The specific structure of the centrifugal fan refers to the above embodiments, and the range hood adopts all the technical schemes of all the above embodiments, so that the range hood at least has all the beneficial effects brought by the technical schemes of the above embodiments, and the detailed description is omitted.
The following table is the experimental test results for the conventional volute assembly and the volute assembly of the present application:
the volute component is applied to the range hood, the pneumatic performance and the noise of the whole range hood are tested according to national standards, and the test results are shown in the table. The noise test shows that the technology provided by the application realizes the air volume of 26m3Effective noise reduction within/min, the maximum noise reduction amount reaches 1.2dBA, and the noise reduction effect is not attenuated when the air volume is increased. The air volume was 26m3When the power consumption of the volute component 10 is reduced by about 2.3% compared with the power consumption of the traditional volute component, the fact that the volute component can effectively improve the air supply efficiency under the large air volume working condition is shown.
The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications and equivalents of the technical solutions that can be directly or indirectly applied to other related fields without departing from the spirit of the present application are intended to be included in the scope of the present application.
Claims (15)
1. A volute assembly, comprising:
a volute; and
the volute tongue and the volute casing are encircled to form a wind wheel cavity and an air outlet communicated with the wind wheel cavity, the wind wheel cavity is used for installing a wind wheel, and the volute tongue comprises an air outlet side curved surface facing the air outlet and a wind wheel side curved surface facing the wind wheel; the wind wheel side curved surface is connected with the wind outlet side curved surface, and a slow flow convex part is arranged on the wind wheel side curved surface.
2. The volute assembly of claim 1, wherein the relief projection extends circumferentially of the volute tongue.
3. The volute assembly of claim 2, wherein the distance between the slow flow projection and the rotor decreases from a middle of the slow flow projection to a side of the slow flow projection.
4. The volute assembly of claim 2, wherein the distance between the slow flow protrusion and the wind wheel decreases from the air-out side curved surface along the circumferential direction of the volute tongue;
and/or the width of the slow flow convex part along the height direction of the volute tongue is reduced from the air outlet side curved surface along the circumferential direction of the volute tongue.
5. The volute assembly of claim 1, wherein the volute comprises a first cover plate, a second cover plate, and a volute side plate disposed between the first cover plate and the second cover plate, and the volute tongue is disposed between the first cover plate and the second cover plate and is connected to the volute side plate.
6. The volute assembly of claim 5, wherein the distance between the first cover plate and the second cover plate is H, and the distance between the highest point of the slow flow projection and the second cover plate is d1, wherein 1/3H ≦ d1 ≦ 1/2H.
7. The volute assembly of claim 5, wherein the first cover plate is spaced apart from the second cover plate by a distance H, the curved outlet side surface is recessed by a recess toward the side away from the outlet opening, and the distance between the lowest point of the recess and the second cover plate is d2, wherein 1/4H ≦ d2 ≦ 1/2H.
8. The volute assembly of claim 7, wherein the curved air outlet side surface has air diffuser portions on both sides of the concave portion, the air diffuser portions having a flow guide surface, the flow guide surface forming an angle α with the length direction of the volute tongue; wherein 85 ° < α <105 °.
9. The volute assembly of claim 1, wherein the slow flow projection is a plurality of slow flow projections disposed on the wind wheel side curved surface.
10. The volute assembly of any of claims 1 to 9, wherein the volute tongue further comprises a connecting curved surface that smoothly connects the air-out side curved surface and the wind wheel side curved surface.
11. The volute assembly of claim 10, wherein the connecting curved surface and a plane perpendicular to the height of the tongue form an intersecting arc, the intersecting arc corresponding to a circle having a radius R; wherein R is more than or equal to 11.5mm and less than or equal to 19.0 mm.
12. The volute assembly of claim 5, wherein the first cover plate defines a first inlet opening and the second cover plate defines a second inlet opening.
13. The volute assembly of claim 1, wherein the volute has a width B and the tongue has a length L; wherein L/B > 0.6.
14. A centrifugal fan comprising a wind wheel mounted in a wind wheel chamber of a volute assembly according to any one of claims 1 to 13, and the volute assembly.
15. A range hood, characterized in that it comprises a centrifugal fan according to claim 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111567417.2A CN114396392B (en) | 2021-12-17 | Volute component, centrifugal fan and range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111567417.2A CN114396392B (en) | 2021-12-17 | Volute component, centrifugal fan and range hood |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114396392A true CN114396392A (en) | 2022-04-26 |
| CN114396392B CN114396392B (en) | 2024-04-26 |
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