CN105485743A - Extractor hood with noise lowering mechanism - Google Patents
Extractor hood with noise lowering mechanism Download PDFInfo
- Publication number
- CN105485743A CN105485743A CN201610031338.2A CN201610031338A CN105485743A CN 105485743 A CN105485743 A CN 105485743A CN 201610031338 A CN201610031338 A CN 201610031338A CN 105485743 A CN105485743 A CN 105485743A
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- China
- Prior art keywords
- convex tendon
- reducing mechanism
- noise reducing
- range hood
- mechanism according
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Classifications
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses an extractor hood with a noise lowering mechanism. A fluid channel in the extractor hood is internally provided with a local sudden expansion area. The extractor hood is characterized in that a vortex generator used for generating an additional vortex boundary layer is arranged in the incoming flow direction of the local sudden expansion area. Compared with the prior art, the extractor hood has the advantages that after the vortex generator is arranged in the incoming flow direction of the local sudden expansion area of the fluid channel of the extractor hood, separated vortexes can be generated, on one hand, the situation that the fluid velocity is suddenly decreased due to sudden expansion can be relieved, and on the other hand, the separated-out vortexes can be used for mixing the boundary layer, and micro fluid pellets nearby the boundary layer can obtain larger rotation momentum; and after the additional vortex boundary layer is formed through the separated-out vortexes, the influence of sudden expansion on the fluid channel can be lowered, the negative pressure and the losses at the turning position can be reduced, and therefore forming drag and noise can be lowered.
Description
Technical field
The present invention relates to a kind of range hood, especially relate to a kind of range hood with noise reducing mechanism.
Background technology
At present, the region i.e. local sudden expansion of several fluid cross-section sudden enlargement is there is in the fluid passage that range hood inner air flows through, these local sudden expansions are mainly positioned at following three regions: 1, exhaust fume collecting hood and blower fan connector, 2, between current collector and wheel nose circle, 3, between volute outlet and outlet housing.Air velocity scope in range hood internal fluid channels is probably between 5-30m/s, from hydromechanical principle, the linear loss that short pipeline is compared in the loss that the sudden expansion of general local produces is large many, especially speed is higher, loss difference is more obvious, the loss that local sudden expansion produces is energy loss source main in process fluid flow, and local sudden expansion can produce larger resistance, the increase of simultaneous boundary layer separation, noise.Therefore, in order to effectively reduce the noise of range hood and reduce local losses, need to be improved the structure of local sudden expansion place in fluid passage.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned prior art present situation, provides a kind of range hood with noise reducing mechanism in boundary layer that can be used for blending local sudden expansion.
The present invention solves the problems of the technologies described above adopted technical scheme: this has the range hood of noise reducing mechanism, in the fluid passage of described range hood inside, be provided with local sudden expansion, it is characterized in that: described noise reducing mechanism is be arranged on coming on flow path direction and being used for producing the vortex generator in boundary layer, additional whirlpool of described local sudden expansion.
Described vortex generator can have various structures, and preferably, described vortex generator is be arranged on the convex tendon on the passage component of local sudden expansion incoming flow end.The incoming flow end of local sudden expansion is the front end of fluid cross-section sudden enlargement, and passage component is the parts that air-flow flows through, the parts such as such as exhaust fume collecting hood, current collector, snail tongue.
As a kind of preferred version, described vortex generator is the top of the exhaust fume collecting hood medial surface being located at range hood and the first convex tendon of close exhaust fume collecting hood inner side edge, described first convex tendon is arranged in order along the length direction of described inner side edge, and the length direction of the first convex tendon is perpendicular to the length direction of described inner side edge.Like this, vortex generator is the simple and easy vortex generator of line style, and structure is very simple, is particularly suitable for the sudden expansion region, local of exhaust fume collecting hood and blower fan connector.
Preferably, also bar shaped installing plate is fixed with near inner side edge place at the top of described exhaust fume collecting hood medial surface, first convex tendon takes shape on this bar shaped installing plate, and the value of the thickness t of the height h1 of the first convex tendon and described bar shaped installing plate to close be t≤h1≤5t, it is 1.5t≤w1≤4t that the value of the width w1 of described first convex tendon and the thickness t of described bar shaped installing plate is closed.
Preferred as such scheme, it is t≤h1 < 3t that the value of the height h1 of described first convex tendon and the thickness t of described bar shaped installing plate is closed, and consistent before and after the height of the first convex tendon.
As such scheme further preferably, it is 3t≤h1≤5t that the value of the height h1 of described first convex tendon and the thickness t of described bar shaped installing plate is closed, and the height of the first convex tendon raises from front to back gradually.Like this, the first convex tendon adopts low early and high after layout, can reduce the generation effect that leading portion resistance increases whirlpool, rear end simultaneously.
As another kind of preferred version, be provided with current collector in the front side of the wheel nose circle of range hood, described vortex generator is along the internal perisporium of current collector the second convex tendon spaced apart.
Further preferably, the second described convex tendon is triangular in shape, the height h2 of this second convex tendon is 3mm≤h2≤10mm, this second convex tendon is 0 ° of < A≤20 ° near the angular range of the base angle A of incoming flow end, the angular range of this second convex tendon drift angle B is B < 110 °, further, this second convex tendon is away from the edge of the contiguous described current collector of base angle C of incoming flow end.Like this, vortex generator is the triangle vortex generator of similar shark fins, is particularly suitable for the sudden expansion region, local between current collector and wheel nose circle.
Further preferably, the width w2 of described second convex tendon is 1mm≤w2≤10mm.
Further preferably, the width w2 of described second convex tendon increases from top to bottom gradually.
As another preferred version, described vortex generator is be located at cooking-fume exhauster blower snail tongue towards the 3rd convex tendon on the side of outlet housing.
Preferred further, the splayed configuration structure that every two adjacent 3rd convex tendons in described 3rd convex tendon open in the flow direction along fluid passage inner fluid.Like this, vortex generator is formed by expansion vortex generator, is particularly suitable for the sudden expansion region, local be applied between spiral case and outlet housing.
In order to improve the ability that eddy current produces, the scope of the angle C between two described 3rd convex tendons mutually opened in splayed configuration is 0 ° of < C≤45 °
Compared with prior art, the invention has the advantages that: this range hood by the local sudden expansion in fluid passage come flow path direction arranges vortex generator after, the whirlpool of separation can be produced, the fluid velocity caused due to sudden expansion can be slowed down on the one hand decline suddenly, the whirlpool of separating on the other hand is for blending boundary layer, fluid micellar near boundary layer is made to obtain larger spinning momentum, the volute be separated can reduce the impact of sudden expansion for fluid passage after becoming additional boundary layer, whirlpool, reduce negative pressure and the loss of corner, thus reduce form drag and noise.
Accompanying drawing explanation
Fig. 1 is the fluid schematic in the sudden expansion region, local of fluid passage in prior art;
Fig. 2 is the fluid schematic in the sudden expansion region, local of fluid passage of the present invention;
Fig. 3 is the structural representation of the embodiment of the present invention one;
Fig. 4 is the enlarged diagram of part A in Fig. 3;
Fig. 5 is the structural representation of the first convex tendon of the embodiment of the present invention one;
Fig. 6 is the structural representation of the embodiment of the present invention two;
Fig. 7 is the enlarged diagram of part B in Fig. 6;
Fig. 8 is the mounting structure schematic diagram of the second convex tendon of the embodiment of the present invention two;
Fig. 9 is the top view of the second convex tendon of the embodiment of the present invention;
Figure 10 is the structural representation of the embodiment of the present invention three;
Figure 11 is the structural representation of snail tongue in Figure 10;
Figure 12 is the structural representation of the 3rd convex tendon of the embodiment of the present invention three.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Local sudden expansion is provided with in the fluid passage of range hood inside of the present invention, local sudden expansion is the region making fluid cross-section sudden enlargement, mainly there is following three region: a, exhaust fume collecting hood 1 and blower fan 2 connector in these local sudden expansions, between b, current collector 4 and impeller 3 front end are enclosed, between c, volute outlet and outlet housing 6.Local sudden expansion can produce larger resistance, the increase of simultaneous boundary layer separation, noise.
Vortex generator of the present invention forms noise reducing mechanism, and its operation principle is as follows:
As depicted in figs. 1 and 2, what the direction of horizontal arrow was local sudden expansion carrys out flow path direction, the flow path direction that comes in local sudden expansion in Fig. 2 is provided with small-sized vortex generator, this vortex generator is be arranged on the convex tendon 7 on the passage component 8 of local sudden expansion incoming flow end, the effect increasing convex tendon 7 is the whirlpool producing little separation in advance, form vortex generator, slow down on the one hand the speed caused due to sudden expansion to decline suddenly, the whirlpool of separating on the other hand is for blending boundary layer, fluid micellar near boundary layer is made to obtain larger spinning momentum, form additional boundary layer, whirlpool, whirlpool keeps original track to continue rotary motion backwards due to the effect of inertia slightly, make original boundary layer can continue one end under the left and right in whirlpool, reduce the unnecessary boundary layer separation after sudden expansion, decrease the impact of sudden expansion for fluid passage, reduce negative pressure and the loss of corner.Thus reduce form drag and noise.
Embodiment one:
As shown in Figures 3 to 5, vortex generator in the present embodiment is the top of exhaust fume collecting hood 1 medial surface being located at range hood and the first convex tendon 71 of close exhaust fume collecting hood inner side edge, this first convex tendon 71 is arranged in order along the length direction of described inner side edge, and the length direction of the first convex tendon 71 is perpendicular to the length direction of inner side edge.Namely this snail generator is the simple and easy vortex generator of line style, and structure is very simple, is particularly suitable for the sudden expansion region, local of exhaust fume collecting hood 1 and blower fan 2 connector.
In the present embodiment, also bar shaped installing plate 11 is fixed with near inner side edge place at the top of exhaust fume collecting hood medial surface, bar shaped installing plate adopts sheet metal component and the inner side edge be arranged on front side of exhaust fume collecting hood 1, first convex tendon 71 takes shape on this bar shaped installing plate 11, and the value of the height h1 of the first convex tendon 71 and the thickness t of bar shaped installing plate 11 to close be t≤h1≤5t, it is 1.5t≤w1≤4t that the value of the width w1 of the first convex tendon 71 and the thickness t of bar shaped installing plate 11 is closed.In addition, as t≤h1 < 3t, consistent before and after the height of the first convex tendon 71; As 3t≤h1≤5t, the height of the first convex tendon 71 raises from front to back gradually.
Embodiment two:
As shown in Figures 6 to 9, the front side enclosed in impeller 3 front end of range hood is provided with current collector 4, and the vortex generator in the present embodiment is along the internal perisporium of current collector 4 second convex tendon 72 spaced apart.This second convex tendon 72 is triangular in shape, and the height h2 of the second convex tendon 72 is 3mm≤h2≤10mm, and the width w2 of the second convex tendon 72 is 1mm≤w2≤10mm, and the width w2 of the second convex tendon 72 can be designed to increase gradually from top to bottom.The length L of the second convex tendon 72 depends primarily on structural member below, namely in the present embodiment, depends on the size of current collector 4.
Second convex tendon 72 is 0 ° of < A≤20 ° near the angular range of the base angle A of incoming flow end, the angular range of this second convex tendon 72 drift angle B is B < 110 °, and this second convex tendon 72 is away from the edge of the contiguous current collector 4 of base angle C of incoming flow end.This vortex generator is the triangle vortex generator of similar shark fins, be particularly suitable for current collector 4 and impeller 3 front end enclose between sudden expansion region, local, further, the second convex tendon 72 and current collector 4 form the change of cliff of displacement formula, more effectively can improve the ability that eddy current produces.
Embodiment three:
As shown in Figure 10 to Figure 12, the vortex generator in the present embodiment is be located at cooking-fume exhauster blower snail tongue 5 towards the 3rd convex tendon 73 on the side of outlet housing 6.The splayed configuration structure that every two adjacent 3rd convex tendons 73 in 3rd convex tendon 73 open in the flow direction along fluid passage inner fluid.Further, in order to improve the ability that eddy current produces, the scope of the angle D between two described 3rd convex tendons 73 mutually opened in splayed configuration is 0 ° of < D≤45 °.Visible, this vortex generator is formed by expansion vortex generator, is particularly suitable for the sudden expansion region, local be applied between volute outlet and outlet housing 6.
In addition, the structure of the 3rd convex tendon 73 in the present embodiment is identical with the structure of the second convex tendon 72 in embodiment two, does not launch to describe at this.
Claims (13)
1. one kind has the range hood of noise reducing mechanism, in the fluid passage of described range hood inside, be provided with local sudden expansion, it is characterized in that: described noise reducing mechanism is be arranged on coming on flow path direction and being used for producing the vortex generator in boundary layer, additional whirlpool of described local sudden expansion.
2. the range hood with noise reducing mechanism according to claim 1, is characterized in that: described vortex generator is be arranged on the convex tendon (7) on the passage component (8) of local sudden expansion incoming flow end.
3. the range hood with noise reducing mechanism according to claim 2, it is characterized in that: described vortex generator is the top of exhaust fume collecting hood (1) medial surface being located at range hood and first convex tendon (71) of close exhaust fume collecting hood inner side edge, described first convex tendon (71) is arranged in order along the length direction of described inner side edge, and the length direction of the first convex tendon (71) is perpendicular to the length direction of described inner side edge.
4. the range hood with noise reducing mechanism according to claim 3, it is characterized in that: be also fixed with bar shaped installing plate (11) near inner side edge place at the top of described exhaust fume collecting hood (1) medial surface, described first convex tendon (71) takes shape on this bar shaped installing plate (11), and the value of the height h1 of described first convex tendon (71) and the thickness t of described bar shaped installing plate (11) to close be t≤h1≤5t, it is 1.5t≤w1≤4t that the value of the width w1 of described first convex tendon (71) and the thickness t of described bar shaped installing plate (11) is closed.
5. the range hood with noise reducing mechanism according to claim 4, it is characterized in that: it is t≤h1 < 3t that the value of the height h1 of described first convex tendon (71) and the thickness t of described bar shaped installing plate (11) is closed, and consistent before and after the height of the first convex tendon (71).
6. the range hood with noise reducing mechanism according to claim 4, it is characterized in that: it is 3t≤h1≤5t that the value of the height h1 of described first convex tendon (71) and the thickness t of described bar shaped installing plate (11) is closed, and the height of the first convex tendon (71) raises from front to back gradually.
7. the range hood with noise reducing mechanism according to claim 2, it is characterized in that: the front side enclosed in impeller (3) front end of range hood is provided with current collector (4), described vortex generator is along the internal perisporium of current collector (4) the second convex tendon (72) spaced apart.
8. the range hood with noise reducing mechanism according to claim 7, it is characterized in that: described the second convex tendon (72) is triangular in shape, the height h2 of described second convex tendon (72) is 3mm≤h2≤10mm, described second convex tendon (72) is 0 ° of < A≤20 ° near the angular range of the base angle A of incoming flow end, the angular range of described second convex tendon (72) drift angle B is B < 110 °, further, described second convex tendon is away from the edge of the contiguous described current collector (4) of base angle C of incoming flow end.
9. the range hood with noise reducing mechanism according to claim 8, is characterized in that: the width w2 of described second convex tendon (72) is 1mm≤w2≤10mm.
10. the range hood with noise reducing mechanism according to claim 9, is characterized in that: the width w2 of described second convex tendon (72) increases from top to bottom gradually.
11. range hoods with noise reducing mechanism according to claim 2, is characterized in that: described vortex generator is for being located at cooking-fume exhauster blower snail tongue (5) towards the 3rd convex tendon (73) on the side of outlet housing (6).
12. range hoods with noise reducing mechanism according to claim 11, is characterized in that: the splayed configuration structure that every two adjacent 3rd convex tendons (73) in described 3rd convex tendon (73) open in the flow direction along fluid passage inner fluid.
13. range hoods with noise reducing mechanism according to claim 12, is characterized in that: the scope of the angle D between two described 3rd convex tendons (73) mutually opened in splayed configuration is 0 ° of < D≤45 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610031338.2A CN105485743B (en) | 2016-01-15 | 2016-01-15 | A kind of range hood with noise reducing mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610031338.2A CN105485743B (en) | 2016-01-15 | 2016-01-15 | A kind of range hood with noise reducing mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105485743A true CN105485743A (en) | 2016-04-13 |
| CN105485743B CN105485743B (en) | 2017-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610031338.2A Active CN105485743B (en) | 2016-01-15 | 2016-01-15 | A kind of range hood with noise reducing mechanism |
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| CN (1) | CN105485743B (en) |
Cited By (2)
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| CN106322474A (en) * | 2016-08-28 | 2017-01-11 | 杭州老板电器股份有限公司 | Flow-guiding, sound-absorbing and three-dimensional noise-reducing system of kitchen ventilator |
| CN110094370A (en) * | 2019-04-26 | 2019-08-06 | 宁波方太厨具有限公司 | A kind of collector for range hood and the range hood with the collector |
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| CN110094370A (en) * | 2019-04-26 | 2019-08-06 | 宁波方太厨具有限公司 | A kind of collector for range hood and the range hood with the collector |
| CN110094370B (en) * | 2019-04-26 | 2021-08-20 | 宁波方太厨具有限公司 | A range hood that is used for range hood's collector and has this collector |
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| Publication number | Publication date |
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| CN105485743B (en) | 2017-11-03 |
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