CN109595637B

CN109595637B - Near-suction type range hood

Info

Publication number: CN109595637B
Application number: CN201710923925.7A
Authority: CN
Inventors: 刘逸; 周佳杰; 梁雪斐; 茅忠群; 诸永定; 刘戈
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2017-09-30
Filing date: 2017-09-30
Publication date: 2024-01-16
Anticipated expiration: 2037-09-30
Also published as: CN109595637A

Abstract

The invention discloses a near-suction type range hood, which comprises a shell, a case and a fan system, wherein the case is positioned above the shell, the shell comprises a panel which is positioned at the front end and is inclined with the horizontal direction, and the near-suction type range hood is characterized in that: the fan system is a ternary fan, the ternary fan is arranged in a cavity formed by the shell and the case together or in the case, at least two smoke guide plates are arranged on the front side of the panel, the smoke guide plates are arranged side by side and at intervals in the left-right direction, and an air inlet channel is formed by a gap between the smoke guide plates and the panel and a gap between adjacent smoke guide plates. By arranging at least two smoke guide plates which are arranged side by side and at intervals on the front side of the panel, the airflow passing through the outer rectifying layer can be effectively divided, rectified and guided, turbulence and turbulence in the airflow are reduced, and smooth airflow is formed.

Description

Near-suction type range hood

Technical Field

The invention relates to kitchen appliances, in particular to a near-suction type range hood.

Background

The range hood has become one of the indispensable kitchen appliances in modern families. The general range hood comprises a top suction type range hood and a near suction type range hood, the near suction type range hood is far away by utilizing vortex wind pressure, most of oil smoke which is nearer to a cooking bench is absorbed in an arc line mode, adverse effects on human health can be reduced, a power source is nearer to the cooking bench, and the suction effect of the power source is basically not reduced.

The utility model discloses a high-efficient environmental protection's side-draft lampblack absorber as disclosed in chinese patent of application number 201320064301.1, including the guide plate that is equipped with the air intake and be located the fan system at guide plate rear, the air intake is linked together with the fan system, and the guide plate top is provided with the roof, and the air intake the place ahead is provided with a smoke baffle, and the guide plate forms the collection cigarette chamber with the clearance of smoke baffle, be equipped with the collection cigarette groove on the roof, the collection cigarette groove includes the upper wall that is connected with the guide plate and the smoke guide wall that is connected with the roof, and the oil smoke gets into the collection cigarette chamber through the upper edge of smoke baffle and the clearance of collection cigarette groove.

According to the scheme in the prior art, the negative pressure area is small, the negative pressure distribution of the air inlet surface is uneven, turbulent flow and turbulent flow are easily caused after the oil smoke enters the smoke collecting cavity, the oil smoke absorbing efficiency is affected, and the guide plate is difficult to clean; the fan system is usually a multi-wing centrifugal fan, and the multi-wing centrifugal fan is arranged in the lower triangle, so that the fan system has a larger volume for ensuring higher air inlet efficiency. In addition, in the arrangement mode of the fan, the impeller has pre-rotation effect on the gas and the direction of the gas can be gradually changed in the process of 90-degree steering in the flowing impeller, so that the simple front-back consistent inlet and outlet angles are unfavorable for the actual functional force of the impeller; in addition, the fan is far away from the air outlet pipeline, so that the pipeline resistance is difficult to overcome, a user with a straight surface of the fan lacks noise reduction measures, and the noise is high.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides the near-suction type range hood which has smooth lampblack airflow, improves smoking efficiency and is convenient to clean.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a near-suction type range hood, includes the casing, is located the quick-witted case and the fan system of casing top, the casing is including being the panel that inclines with the horizontal direction that is located the front end, its characterized in that: the fan system is a ternary fan, the ternary fan is arranged in a cavity formed by the shell and the case together or in the case, at least two smoke guide plates are arranged on the front side of the panel, the smoke guide plates are arranged side by side and at intervals in the left-right direction, and an air inlet channel is formed by a gap between the smoke guide plates and the panel and a gap between adjacent smoke guide plates.

To ensure efficient cleaning by edge suction of steam and smoke, the hood is easy to clean and manufacture, the panel comprises an inner panel and an outer panel surrounding the periphery of the inner panel and forming a frame, the inner panel is provided with an opening communicated with the inside of the shell, the inner panel is recessed towards the inside of the shell relative to the outer panel, and the smoke guide plate and the outer panel are flat planes.

Because the ternary fan is high in efficiency and large in noise, the noise reduction module used for reducing the noise generated by the ternary fan is arranged in the shell and comprises a plurality of baffles forming a sound absorption back cavity and sound absorption holes formed in the top of the sound absorption back cavity.

Preferably, for being convenient for set up in the casing, adapt to the cavity shape of casing, the baffle that constitutes the sound absorption back of the body chamber of module of making an uproar falls includes left baffle, right baffle, preceding baffle, backplate, end baffle and top baffle, the width of top baffle in preceding, rear direction is greater than end baffle, top baffle is from front to back upwards slope gradually, the sound absorption hole has been seted up on the top baffle.

In order to play a role in noise in a wider frequency band, the sound absorption back cavity is internally provided with a middle partition plate and is divided into a first cavity and a second cavity which are positioned at the left side and the right side, the first cavity is internally provided with a first cavity partition plate and is divided into at least two first resonant cavities, and the second cavity is internally provided with a second cavity partition plate and is divided into at least two second resonant cavities.

In order to increase the sound absorption coefficient of high-frequency noise, the cavity volume of the first resonant cavity is smaller than that of the second resonant cavity.

In order to enable the noise reduction module to reach the sound absorption frequency band limit, the sound absorption holes comprise at least two first sound absorption holes and at least two second sound absorption holes, and the aperture of each second sound absorption hole is larger than that of each first sound absorption hole.

In order to increase the sound absorption coefficient of low-frequency noise, a first sound absorption cotton is attached to a baffle plate at the top of the noise reduction module, and a third sound absorption hole matched with the second sound absorption hole is formed in the first sound absorption cotton.

According to one aspect of the invention, the ternary fan is obliquely arranged in a cavity formed by the shell and the chassis together in the horizontal direction, the noise reduction module is arranged below the ternary fan and is close to or clings to the ternary fan, and the aperture of the first sound absorption hole is 0.5-1 mm.

According to another aspect of the invention, the ternary fan is arranged in the chassis obliquely to the horizontal direction, and the aperture of the first sound absorption hole is 0.8-3 mm; or the ternary fan is vertically arranged in the chassis, and the aperture of the first sound absorption hole is 1-5 mm; the noise reduction module is arranged below the ternary fan and is positioned at the bottom of the shell.

In order to guide the oil smoke into the ternary fan better, the centrifugal boosting effect of the front side of the ternary fan is increased, the pressure loss is reduced, the front side of the ternary fan is provided with an air deflector, the air deflector comprises a main body matched with a cavity in the shell, at least part of the periphery of the main body is bent to the front side to form a smoke collecting cavity, and an air guide opening matched with an air inlet of the ternary fan is formed in the main body.

In order to increase the effect of diversion and noise reduction, the bottom of the main body extends downwards and forwards in an inclined mode to form a cover plate, and the cover plate is close to or clung to the top of the noise reduction module.

In order to further reduce noise on the noise propagation path of the ternary fan, a second sound absorbing cotton is attached to the rear side of the main body of the air deflector at a position below the ternary fan.

For the part that makes in the noise frequency spectrum sensitive to the human ear reduces, the ternary fan is to arrange with the horizontal direction slope, ternary fan's air intake department is provided with the collector, the collector includes outer lane and sets up the inner circle in the outer lane orientation ternary fan, the inner circle includes the isolation surface and is located the inner circle fixed surface of isolation surface circumference outside, densely distributed has the sound absorbing hole on the isolation surface.

In order to avoid entering the noise reduction module after the grease separation to influence the noise reduction, the bottom below of casing is provided with the oil cup, at least one first oil drip hole has been seted up on the bottom of noise reduction module, the second oil drip hole has been seted up to the bottom of casing, first oil drip hole and second oil drip hole correspond with the oil cup.

Compared with the prior art, the invention has the advantages that: by arranging at least two smoke guide plates which are arranged side by side and at intervals on the front side of the panel, the airflow passing through the outer rectifying layer can be effectively divided, rectified and guided, turbulence and turbulence in the airflow are reduced, and smooth airflow is formed; the different positions of the air inlet channel are not interfered with each other, so that turbulent flow and turbulent flow are effectively avoided in the shell; the oil smoke contacts with the smoke guide plate before entering the air inlet channel, so that the condensation effect can be achieved, large-particle grease is attached to the smoke guide plate, and the large-particle grease is prevented from entering the range hood; the smoke guide plate can be flat with the panel when the range hood is in a working state, so that the effective cleaning of sucking steam and smoke through the edge can be ensured, and the cleaning and the manufacturing of the range hood are easy; by adopting the ternary fan, the fan has compact structure, relatively small size, high fan efficiency and high air pressure, and the generated negative pressure gradient is large, so that the smoking efficiency is greatly improved; the arrangement mode of the ternary fans can reduce the resistance of the pipeline, and smoke discharge is smoother; through setting up the module of making an uproar that falls, can absorb the full frequency channel noise of high frequency, intermediate frequency and low frequency, avoid influencing the normal use of range hood.

Drawings

Fig. 1 is a schematic view of a first embodiment of a range hood according to the present invention;

fig. 2 is a cross-sectional view of the range hood of fig. 1;

fig. 3 is an exploded view of the range hood of fig. 1;

fig. 4 is a schematic view of a noise reduction module of the range hood according to the present invention;

fig. 5 is an exploded view of a noise reduction module of the range hood according to the present invention;

FIG. 6 is a cross-sectional view A-A of the noise reduction module of FIG. 4;

FIG. 7 is a B-B cross-sectional view of the noise reduction module of FIG. 4;

fig. 8 is a cross-sectional view of the noise reduction module of fig. 4.

Fig. 9 is a schematic view of a second embodiment of the range hood of the present invention;

fig. 10 is a cross-sectional view of the range hood of fig. 9;

fig. 11 is an exploded view of the range hood of fig. 9;

fig. 12 is a schematic view of a collector ring of a three-way fan of a range hood according to the second embodiment;

fig. 13 is an exploded view of the collector of fig. 12.

Fig. 14 is a schematic view of a third embodiment of a range hood according to the present invention;

fig. 15 is a cross-sectional view of the range hood of fig. 14;

fig. 16 is an exploded view of the range hood of fig. 14.

Detailed Description

The invention is described in further detail below with reference to the embodiments of the drawings.

Example 1

Referring to fig. 1 to 3, a near-suction type range hood includes a housing 1 and a cabinet 2 above the housing 1, and for convenience of description, hereinafter, the terms "front", "rear", "left", "right", "up", "down" refer to the direction of a user relative to the range hood when the range hood is in use, and are not limited to the structure.

In the present embodiment, the housing 1 includes the first side plates 11 on the left and right sides, and the front end surfaces of the first side plates 11 are inclined gradually rearward (inclined from the horizontal direction) from top to bottom so as to be inclined toward the front side of the user. A top plate 12 is provided at the top end between the two first side plates 11, and a rear side plate 13 is provided at the rear end between the two first side plates 11.

A panel 14 is arranged between the front ends of the two first side plates 11, an opening 141 is arranged on the panel 14 and communicated with the inside of the shell 1, and at least two smoke guide plates 15 are arranged on the front side of the panel 14. In the present embodiment, the smoke guide plates 15 are three, and are arranged side by side at intervals in the lateral direction (left-right direction). The gap between the smoke guide 15 and the panel 14 and the gap between adjacent smoke guides 15 constitute an air intake passage 151. The panel 14 and the smoke guide 15 are inclined to the horizontal direction, and the inclination direction is the same. By arranging the smoke guide plate 15 in this way, the airflow passing through the outer rectifying layer can be effectively split, rectified and guided, turbulence and turbulence in the airflow are reduced, and smooth airflow is formed; the different positions of the air inlet channel 151 are not interfered with each other, so that turbulent flow and turbulent flow are effectively avoided in the shell 1; the smoke guide plates 15 arranged at intervals can effectively divide, rectify and guide the oil smoke, and the oil smoke is in contact with the smoke guide plates 15 before entering the air inlet channel 151, so that the condensation effect can be achieved, large-particle grease is attached to the smoke guide plates 15, and the large-particle grease is prevented from entering the range hood. The smoke guide plate 15 is flat with the panel 14 when the range hood is in an operating state, and ensures effective cleaning by sucking steam and smoke through the edges, so that cleaning and manufacturing of the range hood are easy.

The panel 14 includes an inner panel 142, and an outer panel 143 surrounding the outer periphery of the inner panel 142 to form a frame, and the opening 141 is formed in the inner panel 142, preferably, the opening 141 is located at the center of the inner panel 142. The inner panel 142 is recessed inwardly of the housing 1 relative to the outer panel 143, and the outer edge of the inner panel 142 and the inner edge of the outer panel 143 are closed in the middle, and both the inner panel 142 and the outer panel 143 are planar. The flat surfaces of the smoke guide 15 and the face plate 14 mean flat surfaces of the smoke guide 15 and the outer face plate 143. When the oil smoke rises, the oil smoke enters the cavity of the shell 1 from the opening 141 on the inner panel 142 through the air inlet channel 151.

A screen 16 is provided inside the casing 1 at a position corresponding to the opening 141. The smoke guide 15 is fixedly connected to the inner panel 142 or the filter screen 16 through the mounting bracket 152.

A bottom plate 17 is connected between the bottom of the housing 1, the bottom of the rear side plate 13 and the bottom of the face plate 14. The first side panel 11, top panel 12, rear side panel 13, face panel 14, smoke guide panel 15 and bottom panel 17 together define a cavity within the housing 1.

The chassis 2 includes four second side plates 21, so as to enclose a square or rectangular cross-section box structure, and the bottom of the chassis 2 is opened, so that the oil smoke can enter the chassis 2 after entering the cavity in the casing 1.

An oil cup 3 is arranged below the bottom plate 17 of the shell 1.

The fan system is arranged in a cavity formed by the shell 1 and the case 2, in this embodiment, the fan system is a ternary fan 4, the ternary fan 4 can adopt the fan structure disclosed in the patent of the applicant with the application number 201620102790.9 in the prior art, and an air outlet of the ternary fan 4 is provided with an air outlet cover 5 for discharging the oil smoke discharged by the ternary fan 4 to an air outlet pipeline. The air inlet 41 of the three-way fan 4 faces forward, corresponds to the opening 141 on the inner panel 142, and is arranged in a cavity formed by the shell 1 and the case 2 obliquely to the horizontal direction, namely, the three-way fan 4 is partially positioned in the shell 1, and the rest is positioned in the case 2. The three-way fan 4 is arranged in such a way, not only has a shorter flow passage (close to the air inlet of the range hood), but also is close to the air outlet pipeline, so that the eddy current loss generated by air flow separation in the impeller of the three-way fan 4 is greatly reduced, and the impeller efficiency is improved.

Because the noise of the three-way fan 4 is large and the noise frequency band is wide, the noise reduction module 7 is preferably arranged below the three-way fan 4 in the cavity of the casing 1, referring to fig. 4-8, the noise reduction module 7 comprises a left baffle 711, a right baffle 712, a front baffle 713, a rear baffle 714, a bottom baffle 715 and a top baffle 716, the width of the top baffle 716 in the front and rear directions is larger than that of the bottom baffle 715, the front baffle 713 is gradually inclined backwards from top to bottom, the left baffle 711 and the right baffle 712 are in a general triangle shape, and the sound absorption back cavity formed by the plates is in a general triangle column shape (the upper part is large and the lower part is small). The top baffle 716 gradually slopes upward from front to back, consistent with the slope of the bottom of the tertiary fan 4, and preferably, the top baffle 716 is near or against the bottom of the tertiary fan 4.

The noise reduction module 7 further comprises an intermediate partition 72, a first chamber partition 73 and a second chamber partition 74. The middle partition 72 is disposed in the sound absorbing back chamber and divides the sound absorbing back chamber into a first chamber 751 located at the left side and a second chamber 752 located at the right side. Preferably, the middle barrier 72 may be parallel to the left barrier 711 or the right barrier 712, and the first and second chambers 751 and 752 into which the middle barrier 72 is partitioned are equal.

The first chamber partitions 73 are disposed in the first chamber 751, including at least two, each first chamber partition 73 extending between the left baffle 711 and the middle baffle 72, and each first chamber partition 73 being bent back toward the rear baffle 714 while extending obliquely downward a distance from the top baffle 716 from front to rear. One of the first chamber partitions 73 is located below the other first chamber partition 73, whereby each of the baffles and the first chamber partitions 73 divide the interior of the first chamber 751 into at least three first resonance chambers 761 from top to bottom.

A second chamber divider 74 is disposed within the second chamber 752, including at least one, the second chamber divider 74 extending between the middle divider 72 and the right baffle 712. One of the second chamber baffles 74 may extend from the top baffle 716 in a downward bend in sections parallel with the front baffle 713, the rear baffle 714, and the bottom baffle 715, respectively, thereby dividing the second chamber 752 into two second resonant cavities 762, i.e., one second resonant cavity 762 between the second chamber baffles 74, the top baffle 716, the middle baffle 72, and the right baffle 712, with the remainder constituting the other second resonant cavity 762. A further second chamber partition 74 may be provided in the further chamber 762, in the form of a flat plate, extending between the middle partition 72 and the right baffle 712, thereby bisecting the further second chamber 762.

The top baffle 716 is provided with at least two first sound absorbing holes 771 and at least two second sound absorbing holes 772, the first sound absorbing holes 771 and the second sound absorbing holes 772 are distributed above the first chamber 751 and the second chamber 752, preferably, the first sound absorbing holes 771 may be in an array shape and are distributed on the surface of the top baffle 716, and the second sound absorbing holes 772 are arranged on the surface of the top baffle 716 in a staggered manner. The first sound absorption holes 771 may be circular holes, square holes, hexagonal holes, etc., and the aperture is 0.5 mm-1 mm, because the noise reduction module 7 is close to or clung to the ternary fan 4, the space between the noise reduction module 7 and the ternary fan 4 is extremely small, the noise frequency band is extremely wide, and only the diameter of the first sound absorption holes 771 is reduced within the above range, the noise reduction module 7 can reach the sound absorption frequency band limit. The second sound absorbing holes 772 have a larger aperture than the first sound absorbing holes 771.

The top baffle 716 is attached with a first sound absorbing cotton 781, and a third sound absorbing hole 773 matched with the second sound absorbing hole 772 is formed in the first sound absorbing cotton 781, so that the sound absorbing coefficient of low-frequency noise is increased by matching with the sound absorbing back cavity.

Because the left side position is mainly high-frequency noise on the noise propagation path below the three-way fan 4, the cavity volume of the first resonant cavity 761 is smaller than that of the second resonant cavity 762, that is, the first resonant cavity 761 can increase the sound absorption coefficient of the high-frequency noise, and the second resonant cavity 762 is a half-open space to increase the sound absorption coefficient of the medium-frequency noise. Such a labyrinth resonant cavity also increases the sound absorption bandwidth of the sound absorbing cotton 78.

Alternatively, the first chamber partition 73 and the second chamber partition 74 may have other shapes as long as the spaces in the first chamber 751 and the second chamber 752 are partitioned, and each of the partitioned resonance chambers may be a rectangular parallelepiped, a cylinder, a cone, an irregularity, or the like. In addition, the surfaces of the sound absorption back cavity and the resonance cavities can be adhered with sound absorption cotton.

In order to reduce the frequency of the absorbed noise, reduce the diameter of the micropores, increase the distance between adjacent micropores, increase the height of the resonant cavities, the maximum interval between the sound absorption holes should preferably be one fifth of the wavelength of the corresponding sound wave, preferably 8-50 mm, and the maximum interval is 70mm, and the height of each resonant cavity should preferably be one third of the wavelength of the corresponding sound wave.

Through the arrangement mode, the ternary fan 4 is closely adjacent to the noise reduction module 7, so that the ternary fan 4 has a good effect of inhibiting radiation noise, and is compact in structure. The structure of the noise reduction module 7 greatly improves the sound absorption frequency bands and can effectively absorb the noise of each frequency band.

At least one first oil drop hole 7151 is formed in the bottom plate 715, and a second oil drop hole 171 (which may or may not correspond to the first oil drop hole 7151) is formed in the bottom plate 17 of the housing 1, and the position of the oil drop hole corresponds to the position of the oil cup 3. Thus, even if the separated grease enters the noise reduction module 7, the grease can be discharged to the oil cup 3 through the first oil drop hole 7151 and the second oil drop hole 171 so as not to influence the noise reduction effect of the noise reduction module 7.

Example two

Referring to fig. 9 to 13, in the present embodiment, the difference from the first embodiment is that the air intake 41 of the three-way fan 4 is directed forward and is disposed in the cabinet 2 obliquely to the horizontal direction. A collector ring 42 is arranged at the air inlet 41 of the ternary fan 4. The ternary fan 4 is lifted and arranged in such a way, so that direct suction and direct discharge are realized, a negative pressure area is concentrated, the pipeline resistance is reduced, and smoke discharge is smoother.

Since the three-way fan 4 is obliquely arranged in the case 2 without shielding, low-frequency noise generated by the three-way fan 4 is more likely to be transmitted outwards. For this purpose, the collector ring 42 preferably takes the form as disclosed in the patent application No. 201210230512.8 of the present application, and includes an outer ring 421 and an inner ring 422, the inner ring 422 being located inside the outer ring 421 toward the inside of the three-way fan 4, the outer ring 421 including a wind guiding surface 4211 extending inward from the wind inlet 41 and an outer ring fixing surface 4212 for fixing located at the circumferential outside of the wind guiding surface 4211, and the inner ring 422 including a partition surface 4221 for blocking a turbulent flow region in cooperation with the wind guiding surface 4211 and an inner ring fixing surface 4222 located at the circumferential outside of the partition surface 4221 for fixing. Sound absorbing holes 4223 are densely distributed on the isolation surface 4221 of the inner ring 422. When the noise air flow generated by the three-way fan 4 passes through the sound absorbing hole 4223, the air flow noise moves to high frequency, so that the part sensitive to human ears in the noise spectrum is reduced. Sound absorbing cotton can be further arranged between the outer ring 421 and the inner ring 422.

In order to enable the oil smoke to be better guided into the tertiary fan, an air deflector 6 is arranged between the tertiary fan 4 and the panel 14, and the air deflector 6 comprises a main body 61 and a top air deflector 63 positioned at the top of the main body 61. Wherein, the main body 61 is plate-shaped, the inclination direction is consistent with that of the ternary fan 4, the main body 61 is arranged in the shell 1 and the case 2, the main body 61 is provided with a wind guide port 611, and the shape and the size of the wind guide port 611 are matched with those of the wind inlet of the ternary fan 4; the top air deflector 62 is formed by bending the top of the main body 61 toward the second side plate 21 on the front side of the cabinet 2, and is fixedly connected to the second side plate 21. The deflector 6 further includes a cover plate 64 extending obliquely downward and forward from the bottom of the main body 61, the cover plate 64 extending to be close to the panel 14. Thus, the air deflector 6 forms a smoke collecting cavity, and can guide the oil smoke diffused from the panel 14 into the shell 1 to the three-way fan 4, thereby improving smoking efficiency. The air deflector 6 increases the centrifugal boosting effect of the front side of the ternary fan 4 and reduces the pressure loss.

The top baffle 716 of the noise reduction module 7 gradually inclines upwards from front to back, and is consistent with the inclination direction of the bottom and the cover plate 64 of the three-way fan 4, and preferably, the top baffle 716 is close to or clung to the cover plate 64 of the air deflector 6, thereby increasing the flow guiding and noise reduction effects.

In addition, the arrangement mode of the ternary fan 4 has the advantages of small rotating speed, concentrated negative pressure area and high low-frequency noise, and the highly preferable sound absorption back cavity is required to be 8-20 mm.

The diameter of the first sound absorption hole 771 formed on the top baffle 716 is 0.8 mm-3 mm, because the noise reduction module 7 is close to or clung to the cover plate 64, a certain distance is provided between the noise reduction module 7 and the three-way fan 4, the noise frequency band is wider, and only if the diameter of the first sound absorption hole 771 is reduced within the range, the noise reduction module 7 can reach the frequency band limit.

The top baffle 716, the first sound absorbing cotton 781, and the cover plate 64 may be attached to each other. A second sound absorbing cotton 782 may be attached to the rear side of the main body 61 of the wind deflector 6 at a position below the tertiary fan 4 to further reduce noise on the noise propagation path of the tertiary fan 4.

Example III

Referring to fig. 14 to 16, in the present embodiment, the difference from the second embodiment is that the air intake 41 of the three-way fan 4 is directed forward and vertically placed in the cabinet 2. In this fan arrangement, low frequency noise is blocked, so that there is no need to provide sound absorbing holes 4223 in the collector 42 to convert the noise frequency. In addition, the diameter of the vertically arranged ternary fan 4 is larger than that of the obliquely arranged ternary fan 4 in the second embodiment so as to compensate the flow loss of airflow steering, and the diameter of the ternary fan 4 is preferably 220-300 mm.

The main body 61 is bent backwards for a certain distance in the shell 1 and then is bent downwards in an inclined way to form a bending part 612, and the bending part 612 of the main body 61 is positioned below the three-way fan 4; the air deflector 6 further includes a cover plate 64 extending obliquely downward and forward from the bottom of the bent portion 612 of the main body 61, the cover plate 64 extending to be close to the panel 14.

In addition, the three-way fan 4 has high rotating speed and high frequency noise, and the height of the sound absorption back cavity is required to be larger, preferably 15-28 mm.

Since the noise reduction module 7 is further away from the three-way fan, the diameter of the first sound absorption hole 771 formed in the top baffle 716 is 1mm to 5mm, and the noise reduction module 7 can reach the frequency band limit only by reducing the diameter of the first sound absorption hole 771 within the above range.

A second sound absorbing cotton 782 may be attached to the rear side of the bent portion 612 of the main body 61 of the air deflector 6 at a position below the tertiary fan 4, further reducing noise on the noise propagation path of the tertiary fan 4.

The air deflector 6 described above can also be used in the first embodiment.

Claims

1. The utility model provides a near-suction type range hood, includes casing (1), is located quick-witted case (2) and fan system of casing (1) top, casing (1) are including being located front end and panel (14) that the horizontal direction is the slope, its characterized in that: the fan system is a ternary fan (4), the ternary fan (4) is arranged in a cavity formed by the shell (1) and the machine case (2) together or in the machine case (2), at least two smoke guide plates (15) are arranged on the front side of the panel (14), the smoke guide plates (15) are arranged side by side and at intervals in the left-right direction, and an air inlet channel (151) is formed by a gap between the smoke guide plates (15) and the panel (14) and a gap between adjacent smoke guide plates (15);

a noise reduction module (7) for reducing noise generated by the ternary fan (4) is arranged in the shell (1), and the noise reduction module (7) comprises a plurality of baffles forming a sound absorption back cavity and sound absorption holes formed in the top of the sound absorption back cavity;

the baffle that constitutes sound absorption back of body chamber of module of making an uproar (7) falls includes left baffle (711), right baffle (712), preceding baffle (713), backplate (714), bottom baffle (715) and top baffle (716), the ascending width of top baffle (716) in preceding, rear direction is greater than bottom baffle (715), top baffle (716) are from front to back upwards slope gradually, sound absorbing hole has been seted up on top baffle (716).

2. The near suction type range hood according to claim 1, wherein: the panel (14) comprises an inner panel (142) and an outer panel (143) surrounding the periphery of the inner panel (142) and forming a frame, an opening (141) communicated with the inside of the shell (1) is formed in the inner panel (142), the inner panel (142) is sunken towards the inside of the shell (1) relative to the outer panel (143), and the smoke guide plate (15) and the outer panel (143) are flat planes.

3. The near suction type range hood according to claim 1 or 2, wherein: the sound absorption back cavity is internally provided with a middle partition board (72) and is divided into a first cavity (751) and a second cavity (752) which are positioned at the left side and the right side, the first cavity (751) is internally provided with a first cavity partition board (73) and divides the first cavity (751) into at least two first resonance cavities (761), the second cavity (752) is internally provided with a second cavity partition board (74) and divides the second cavity (752) into at least two second resonance cavities (762).

4. A near suction range hood according to claim 3, wherein: the first resonant cavity (761) has a smaller cavity volume than the second resonant cavity (762).

5. The near suction type range hood according to claim 1 or 2, wherein: the sound absorption holes comprise at least two first sound absorption holes (771) and at least two second sound absorption holes (772), and the aperture of the second sound absorption holes (772) is larger than that of the first sound absorption holes (771).

6. The near suction type range hood according to claim 5, wherein: the baffle at the top of the noise reduction module (7) is adhered with first sound absorption cotton (781), and a third sound absorption hole (773) matched with the second sound absorption hole (772) is formed in the first sound absorption cotton (781).

7. The near suction type range hood according to claim 5, wherein: the three-way fan (4) is obliquely arranged in a cavity formed by the shell (1) and the chassis (2) together in the horizontal direction, the noise reduction module (7) is arranged below the three-way fan (4) and is close to or clung to the three-way fan (4), and the aperture of the first sound absorption hole (771) is 0.5-1 mm.

8. The near suction type range hood according to claim 5, wherein: the ternary fan (4) is obliquely arranged in the chassis (2) along the horizontal direction, and the aperture of the first sound absorption hole (771) is 0.8-3 mm; or the ternary fan (4) is vertically arranged in the case (2), and the aperture of the first sound absorption hole (771) is 1-5 mm; the noise reduction module (7) is arranged below the ternary fan (4) and is positioned at the bottom of the shell (1).

9. The near suction type range hood according to claim 8, wherein: the front side of ternary fan (4) is provided with aviation baffle (6), aviation baffle (6) include main part (61) with cavity adaptation in casing (1), the periphery of main part (61) is at least partly to the front side bending type and is formed and draw in the cigarette chamber, offer wind guide mouth (611) with air intake (41) adaptation of ternary fan (4) on main part (61).

10. The near suction range hood of claim 9, wherein: the bottom of the main body (61) extends downwards and forwards in an inclined mode to form a cover plate (64), and the cover plate (64) is close to or clung to the top of the noise reduction module (7).

11. The near suction range hood of claim 9, wherein: a second sound absorbing cotton (782) is attached to the rear side of the main body (61) of the air deflector (6) at a position below the three-way fan (4).

12. The near suction type range hood according to claim 8, wherein: the three-way fan (4) is arranged obliquely with the horizontal direction, a collector ring (42) is arranged at an air inlet (41) of the three-way fan (4), the collector ring (42) comprises an outer ring (421) and an inner ring (422) arranged on the outer ring (421) towards the inner side in the three-way fan (4), the inner ring (422) comprises an isolation surface (4221) and an inner ring fixing surface (4222) positioned on the periphery outer side of the isolation surface (4221), and sound absorbing holes (4223) are densely distributed on the isolation surface (4221).

13. The near suction type range hood according to claim 1 or 2, wherein: the oil cup (3) is arranged below the bottom of the shell (1), at least one first oil dropping hole (7151) is formed in the bottom of the noise reduction module (7), a second oil dropping hole (171) is formed in the bottom of the shell (1), and the first oil dropping hole (7151) and the second oil dropping hole (171) correspond to the oil cup (3).