CN111237249B - Fan system of range hood - Google Patents

Fan system of range hood Download PDF

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Publication number
CN111237249B
CN111237249B CN201811429576.4A CN201811429576A CN111237249B CN 111237249 B CN111237249 B CN 111237249B CN 201811429576 A CN201811429576 A CN 201811429576A CN 111237249 B CN111237249 B CN 111237249B
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CN
China
Prior art keywords
ring
impeller
range hood
volute
retainer ring
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Active
Application number
CN201811429576.4A
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Chinese (zh)
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CN111237249A (en
Inventor
雷改
徐志能
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningbo Fotile Kitchen Ware Co Ltd
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Ningbo Fotile Kitchen Ware Co Ltd
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Priority to CN201811429576.4A priority Critical patent/CN111237249B/en
Publication of CN111237249A publication Critical patent/CN111237249A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • 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
    • F04D29/66—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
    • F04D29/665—Sound attenuation by means of resonance chambers or interference
    • 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
    • F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
    • 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 fan system of a range hood, which comprises a volute and an impeller rotatably arranged in the volute, wherein the volute is provided with an air inlet, the edge of the air inlet is provided with an air inlet ring arranged along the circumferential direction of the air inlet, the front end of the impeller is provided with an impeller front ring, the outer edge of the impeller front ring extends backwards to form a first check ring arranged along the circumferential direction of the impeller, the front end of the volute is provided with a volute front cover, the inner edge of the volute front cover extends backwards to form a second check ring arranged along the circumferential direction of the impeller, a gap is formed between the second check ring and the first check ring, and the inner edge of the air inlet ring bends backwards smoothly and is arranged close to the inner edge of the impeller front ring so as to form a silencing cavity together with the impeller front ring and the volute front cover. The structure not only can effectively reduce noise, but also can block airflow and vortex flowing back from the air inlet by the first check ring, so that the airflow and the vortex are prevented from flowing back to the inside of the impeller, and the air quantity of the fan is effectively improved, and experiments prove that the structure can improve the air quantity by 3m3/min。

Description

Fan system of range hood
Technical Field
The invention relates to a fan system of a range hood.
Background
The hearing of people is often damaged when the users are in a high-noise environment for a long time, and the emotional problems of the users are caused when the users are in the noise environment for a long time. Along with the improvement of the life quality of people, the tolerance of people to noise is lower and lower. Therefore, the noise reduction of the range hood is more and more emphasized.
Noise reduction of a range hood in the prior art is realized mostly by an active noise reduction mode and a passive noise reduction mode. The active noise reduction mode only can act on the noise with the frequency within 1000Hz, and the noise more than 1000Hz can be processed only by a passive noise reduction technology. In the range hoods in the current market, noise reduction of a fan system is mainly achieved through sound-absorbing cotton, the method not only has a general noise reduction effect, but also needs a certain space for placing the sound-absorbing cotton, which can affect the air duct circulation of the fan system, and the sound-absorbing cotton also has a certain potential safety hazard; in the method, a certain noise reduction effect is achieved on the new range hood, and after a user uses the novel range hood for a period of time, oil drops block the small holes, so that the noise reduction effect is ineffective.
When the range hood works, the power supply drives the motor to work, the motor drives the impeller to rotate at a high speed, and a negative pressure area can be formed in a certain range of the air inlet of the range hood, so that air fluid flows along a certain flow channel. When air fluid passes through the volute air inlet ring, the flow velocity is large, generally about 10m/s, after the fluid enters the volute, due to the fact that the flow velocity is large and the influence of the internal structure of the volute on the fluid flow channel is achieved, the fluid forms vortexes with different sizes and backflow with different degrees in the volute, and the phenomenon not only can cause reduction of air volume, but also can cause increase of noise. Especially, obvious backflow phenomenon and vortex appear at the air inlet end face of the volute, and the performance of the fan is seriously influenced.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a fan system of a range hood, which can reduce or even eliminate the problems of vortex and backflow at an air inlet ring so as to effectively reduce noise.
The invention aims to solve another technical problem of providing a fan system of a range hood, which can effectively improve the air quantity, aiming at the current situation of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a range hood's fan system, includes the spiral case and can locate the impeller in this spiral case with rotating, the spiral case has the air intake, and this air intake edge is provided with along the air intake circle that air intake circumference was arranged, its characterized in that: the front end of the impeller is provided with an impeller front ring, the outer edge of the impeller front ring extends backwards to form a first retaining ring arranged along the circumferential direction of the impeller, the front end of the volute is provided with a volute front cover, the inner edge of the volute front cover extends backwards to form a second retaining ring arranged along the circumferential direction of the impeller, a gap is formed between the second retaining ring and the first retaining ring, and the inner edge of the air inlet ring bends backwards smoothly and is arranged close to the inner edge of the impeller front ring so as to form a silencing cavity together with the impeller front ring and the volute front cover.
In the above aspect, the width of the gap in the impeller radial direction is d,the tangential cross-sectional area of the anechoic cavity is S, d is that S is 1mm (40-60) mm2More preferably, d: S ═ 1mm:50mm3. Because the sound-absorbing cavity formed in the invention is actually a Helmholtz sound-absorbing device, the incident sound wave excites the air column in the aperture to reciprocate and rub with the neck wall, and part of sound energy is converted into heat energy to be consumed, so that the sound-absorbing purpose is achieved. The invention adopts the structure of the parameters to obtain the best sound eliminating effect.
Preferably, the rear end of the first retainer ring is located behind the rear end of the second retainer ring. By adopting the structure, the air flow is prevented from entering the silencing cavity through the gap to influence the air quantity of the fan on the basis of good silencing effect.
As an improvement, the outer edge of the impeller front ring gradually inclines forwards to form a third retaining ring, and the outer edge of the third retaining ring is smoothly connected with the front end of the first retaining ring, so that the first retaining ring and the third retaining ring jointly enclose a diversion trench which can prevent fluid from entering the muffling cavity. The structure can guide the airflow vortex at the air inlet of the fan to be discharged to the air outlet, and the airflow is prevented from flowing back to the inside of the impeller, so that the air quantity of the range hood is improved.
Preferably, the first retainer ring is connected with the third retainer ring through an arc ring arched towards the air inlet ring, the first end of the arc ring is tangentially connected with the front end of the first retainer ring, and the second end of the arc ring is tangentially connected with the outer edge of the third retainer ring. The structure is arranged, so that the air flow can be further effectively prevented from flowing back to the interior of the impeller.
Preferably, an acute angle formed between the third retaining ring and the impeller front ring is θ, and θ is 45 ° to 75 °.
Preferably, the length of the first retainer ring is L1, the radian radius of the third retainer ring is R, and the ratio of L1 to R (10-12) to 5 is provided.
Preferably, the length of the first retainer ring on the rear side of the impeller front ring is L2, the length of the first retainer ring on the front side of the impeller front ring is L3, and the ratio of L2 to L3 is 4 (6-8).
Preferably, the width of the section of the silencing cavity is gradually increased and then gradually reduced from outside to inside along the radial direction. The structure is beneficial to improving the noise elimination effect.
Compared with the prior art, the invention has the advantages that: the inner edge of the air inlet ring is smoothly bent backwards and is arranged close to the inner edge of the front ring of the impeller so as to form a silencing cavity which is formed by enclosing the impeller front ring and the front cover of the volute together and adopts the Helmholtz silencing principle3/min。
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is an enlarged schematic view of portion A of FIG. 2;
FIG. 4 is a cross-sectional view of an air intake collar in an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1 to 4, the fan system of the range hood of the present embodiment includes a volute 1 and an impeller 2 rotatably disposed in the volute 1, the volute 1 has an air inlet 11, and an air inlet ring 3 disposed along a circumferential direction of the air inlet 11 is disposed at an edge of the air inlet 11. The front end of the impeller 2 has an impeller front ring 21, and the outer edge of the impeller front ring 21 extends backward to form a first retainer ring 211 arranged along the circumferential direction of the impeller 2. The front end of the volute 1 is provided with a volute front cover 12, the inner edge of the volute front cover 12 extends backwards to form a second retaining ring 121 arranged along the circumferential direction of the impeller 2, a gap 10 is formed between the second retaining ring 121 and the first retaining ring 211, and the inner edge of the air inlet ring 11 is smoothly bent backwards and arranged close to the inner edge of the impeller front ring 21 so as to jointly enclose a silencing cavity 20 with the impeller front ring 21 and the volute front cover 12.
The width of the gap 10 in the radial direction of the impeller 2 is d, the tangential cross-sectional area of the muffling cavity 20 is S, and d is 1mm (40-60) mm2Preferably, d is 1mm to 50mm2. Because the sound-absorbing cavity 20 formed in this embodiment is actually a helmholtz sound-absorbing device, the incident sound wave excites the air column in the aperture to reciprocate, and rubs against the neck wall, and part of the sound energy is converted into heat energy to be consumed, so as to achieve the purpose of sound absorption. In the present embodiment, the best muffling effect can be obtained by adopting the above-mentioned parameter structure. The rear end of the first retainer ring 211 is located behind the rear end of the second retainer ring 121, and the structure can prevent air flow from entering the silencing cavity 20 through the gap 10 to affect the air quantity of the fan on the basis of good silencing effect.
In this embodiment, the outer edge of the impeller front ring 21 extends forward with a gradually inclined angle to form a third retaining ring 212, and the outer edge of the third retaining ring 212 is smoothly connected with the front end of the first retaining ring 211, so that the first retaining ring 211 and the third retaining ring 212 jointly enclose the guide groove 200 capable of preventing fluid from entering the muffling chamber 20. The first retainer ring 211 is connected with the third retainer ring 212 through an arc-shaped ring 213 arched towards the air inlet ring 3, the first end of the arc-shaped ring 213 is tangentially connected with the front end of the first retainer ring 211, and the second end of the arc-shaped ring 213 is tangentially connected with the outer edge of the third retainer ring 212. The first retainer ring 211, the third retainer ring 212, and the arcuate ring 213 of this embodiment are formed integrally. An acute angle formed between the third retainer 212 and the impeller front ring 21 is θ, and θ is 45 ° to 75 °. The length of the first retainer ring 211 is L1, the radian radius of the third retainer ring 212 is R, and the ratio of R to L1 is (10-12) and 5. The length of the first retainer ring 211 on the rear side of the impeller front ring 21 is L2, the length of the first retainer ring 211 on the front side of the impeller front ring 21 is L3, and the L2: L3 is 4 (6-8). By adopting the structure, the airflow vortex at the air inlet 11 of the fan can be guided to be discharged to the air outlet, and the airflow is prevented from flowing back to the inside of the impeller 2, so that the air quantity of the range hood is improved. The section width of the silencing cavity 20 is gradually increased and then gradually reduced from outside to inside along the radial direction of the impeller 2, and the structure is favorable for improving the silencing effect.
In the embodiment, the inner edge of the air inlet ring 3 is smoothly bent backwards and is arranged close to the inner edge of the impeller front ring 21 so as to jointly enclose and form the noise elimination cavity 20 which adopts the Helmholtz noise elimination principle with the impeller front ring 21 and the volute casing front cover 12, the structure not only can effectively reduce noise, but also can block airflow and vortex which flow back at the air inlet 11 by the first check ring 211 and prevent the airflow and the vortex from flowing back to the inside of the impeller 2, so that the air volume of the fan is effectively improved, and experiments prove that the structure can improve the air volume by 3m3/min。

Claims (9)

1. The utility model provides a range hood's fan system, includes spiral case (1) and can locate impeller (2) in this spiral case (1) with rotating, spiral case (1) has air intake (11), and this air intake (11) edge is provided with along air intake circle (3) that air intake (11) circumference was arranged, its characterized in that: the front end of the impeller (2) is provided with an impeller front ring (21), the outer edge of the impeller front ring (21) extends backwards to form a first retainer ring (211) arranged along the circumferential direction of the impeller (2), the front end of the volute (1) is provided with a volute front cover (12), the inner edge of the volute front cover (12) extends backwards to form a second retainer ring (121) arranged along the circumferential direction of the impeller (2), a gap (10) is formed between the second retainer ring (121) and the first retainer ring (211), and the inner edge of the air inlet ring (3) is bent backwards in a smooth manner and is arranged close to the inner edge of the impeller front ring (21) so as to jointly enclose a silencing cavity (20) with the impeller front ring (21) and the volute front cover (12); the outer edge of the impeller front ring (21) is gradually and obliquely extended forwards to form a third retaining ring (212), the outer edge of the third retaining ring (212) is smoothly connected with the front end of the first retaining ring (211), and therefore the first retaining ring (211) and the third retaining ring (212) jointly enclose a diversion groove (200) capable of preventing fluid from entering the muffling cavity (20).
2. The fan system of a range hood of claim 1, wherein: the width of the gap (10) in the radial direction of the impeller (2) is d, the tangential cross-sectional area of the muffling cavity (20) is S, and d and S are 1mm (40-60) mm2。
3. According toThe fan system of a range hood of claim 2, wherein: s is 1mm to 50mm2。
4. The fan system of a range hood of claim 1, wherein: the rear end of the first retainer ring (211) is positioned behind the rear end of the second retainer ring (121).
5. The fan system of a range hood according to any one of claims 1 to 4, wherein: the first retainer ring (211) is connected with the third retainer ring (212) through an arc ring (213) which arches towards the direction of the air inlet ring (3), the first end of the arc ring (213) is tangentially connected with the front end of the first retainer ring (211), and the second end of the arc ring (213) is tangentially connected with the outer edge of the third retainer ring (212).
6. The fan system of a range hood according to any one of claims 1 to 4, wherein: an acute angle formed between the third retaining ring (212) and the impeller front ring (21) is theta, and the theta is 45-75 degrees.
7. The fan system of range hood of claim 5, wherein: the length of the first retainer ring (211) is L1, the radian radius of the third retainer ring (212) is R, and the L1: R is (10-12): 5.
8. The fan system of range hood of claim 7, wherein: the length of the first retainer ring (211) on the rear side of the impeller front ring (21) is L2, the length of the first retainer ring (211) on the front side of the impeller front ring (21) is L3, and the ratio of L2 to L3 is 4 (6-8).
9. The fan system of a range hood according to any one of claims 1 to 4, wherein: the width of the section of the silencing cavity (20) is gradually increased and then gradually reduced from outside to inside along the radial direction of the impeller (2).
CN201811429576.4A 2018-11-28 2018-11-28 Fan system of range hood Active CN111237249B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811429576.4A CN111237249B (en) 2018-11-28 2018-11-28 Fan system of range hood

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811429576.4A CN111237249B (en) 2018-11-28 2018-11-28 Fan system of range hood

Publications (2)

Publication Number Publication Date
CN111237249A CN111237249A (en) 2020-06-05
CN111237249B true CN111237249B (en) 2021-01-15

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CN201811429576.4A Active CN111237249B (en) 2018-11-28 2018-11-28 Fan system of range hood

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Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201944911U (en) * 2010-11-25 2011-08-24 宁波方太厨具有限公司 Range hood capable of effectively reducing noise and stabilizing flow
CN102767541B (en) * 2012-07-04 2015-10-28 宁波方太厨具有限公司 A kind of noise reduction afflux circle and use the kitchen ventilator of this afflux circle
CN104454664B (en) * 2014-11-26 2017-12-01 宁波方太厨具有限公司 A kind of multi-wing centrifugal fan
DE102015213471B4 (en) * 2015-07-17 2021-11-11 Wilhelm Bruckbauer Fan module
CN107339264A (en) * 2017-03-15 2017-11-10 宁波方太厨具有限公司 A kind of blower fan system auxiliary denoising device of single air-inlet range hood
CN107965475A (en) * 2017-05-09 2018-04-27 宁波方太厨具有限公司 A kind of noise reducing type radial fan
CN108050102A (en) * 2018-01-29 2018-05-18 美的集团股份有限公司 Impeller, fan assembly and electric appliance
CN207975028U (en) * 2018-01-29 2018-10-16 广东美的白色家电技术创新中心有限公司 Impeller, fan assembly and electric appliance

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