CN109595654B - Near-suction type range hood - Google Patents

Abstract

The invention discloses a near-suction type range hood, which comprises a shell and a fan system, wherein the shell comprises a panel which is positioned at the front end and is inclined with the horizontal direction, and an air inlet which is formed by opening is arranged on the panel, and the near-suction type range hood is characterized in that: the fan system is a ternary fan, a filter screen is arranged at the air inlet of the ternary fan and/or at the opening of the panel, and circular meshes are formed in the filter screen. The meshes are designed into circular holes, so that noise generated when the oil smoke passes through the filter screen is reduced; by limiting the arrangement mode of the meshes, the size of the mesh holes and the intervals among the meshes, the air inlet area of the filter screen is ensured.

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 invention discloses a range hood disclosed in China patent with the application number of 201120392664.9, which comprises a shell provided with a forward-inclined smoking opening, wherein an exhaust component opposite to the smoking opening is obliquely arranged in the shell, a filter component is obliquely arranged at the smoking opening, and the filter component comprises a filter screen detachably arranged at the outer side of the smoking opening; another technical scheme adopted by the negative pressure type smoke exhaust ventilator is disclosed in China patent with the application number of 201210410639.8: the smoke exhaust device comprises a volute type fan, wherein the volute type fan is arranged on the outer side of a smoke exhaust negative pressure air channel, a positive pressure air outlet which is connected with the volute type fan in a same body is upwards connected with the upper end of the smoke exhaust negative pressure air channel at a certain oblique angle, so that a smoke exhaust outlet air channel which is formed by the positive pressure air outlet and the negative pressure smoke exhaust air channel is connected, the lower end of the smoke exhaust negative pressure air channel is connected with the upper surface of a smoke collecting shell, the upper end of the smoke exhaust negative pressure air channel and the positive pressure air outlet form a smoke exhaust outlet air channel, and a smoke filter screen is arranged outside the smoke collecting shell.

According to the scheme in the prior art, the meshes of the filter screen are long, and noise generated when oil fume passes through the filter screen is large; in addition, as only one filter screen is provided, the filtering effect is poor, and grease cannot be completely filtered before entering a fan system; in addition, as the multi-wing centrifugal fan is generally adopted, and the multi-wing centrifugal fan is arranged in the lower triangle, in order to ensure higher air inlet efficiency, the fan system is larger. 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

The invention aims to solve the technical problems in the prior art and provides a near-suction type range hood capable of improving smoking filtering efficiency and reducing noise.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a near-suction type range hood, includes casing and fan system, the casing is the panel of slope including being located the front end with the horizontal direction, set up the opening on the panel and become the air intake of range hood, its characterized in that: the fan system is a ternary fan, a filter screen is arranged at the air inlet of the ternary fan and/or at the opening of the panel, and circular meshes are formed in the filter screen.

For strengthening the filter effect, preferably, the filter screen includes the first filter screen of the opening part of setting on the panel to and the second filter screen of setting in the air intake department of ternary fan, first filter screen includes first filter screen body and the first mesh of densely covered on first filter screen body, the second filter screen includes second filter screen body and the second mesh of densely covered on second filter screen body.

For the dismouting of being convenient for first filter screen, the bottom of first filter screen body is provided with downwardly extending's inserted sheet, and the top of first filter screen body is provided with to the casing in extension, hollow spliced pole, the panel be located the opening lower limb the position seted up with inserted sheet complex jack, the panel be located the opening upper edge the position be provided with to the casing outside convex with spliced pole complex location projection, from this make first filter screen and panel detachable connection.

In order to ensure larger air inlet area, avoid oil stain blocking the meshes, ensure better filtering effect, the aperture of each mesh is the same and is 3-8 mm, and the distance between two adjacent meshes is 2-3 times of the aperture of the mesh.

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 in the horizontal direction, an air inlet of the ternary fan corresponds to an opening on the panel, 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, a case is arranged above the shell, the ternary fan is arranged in the case 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, increase the centrifugal boosting effect of ternary fan front side, reduce pressure loss, the front side of ternary fan is provided with the aviation baffle, the aviation baffle includes the main part with the cavity adaptation in the casing, the periphery of main part is buckled to the front side of casing at least and is formed and draw in the cigarette chamber, offered the air guide mouth with the air intake adaptation of ternary fan in the main part.

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.

Compared with the prior art, the invention has the advantages that: the meshes are designed into circular holes, so that noise generated when the oil smoke passes through the filter screen is reduced; the air inlet area of the filter screen is ensured by limiting the arrangement mode of the meshes and the size and the interval between the meshes; 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 first filter screen of the range hood of fig. 1;

fig. 5 is a schematic view of a second filter screen of the range hood of fig. 1;

fig. 6 is a schematic view of a noise reduction module of the range hood according to the present invention;

fig. 7 is an exploded view of a noise reduction module of the range hood according to the present invention;

FIG. 8 is a cross-sectional view A-A of the noise reduction module of FIG. 6;

FIG. 9 is a B-B cross-sectional view of the noise reduction module of FIG. 6;

FIG. 10 is a cross-sectional view of the noise reduction module of FIG. 6

Fig. 11 is a schematic view of a second embodiment of the range hood of the present invention;

fig. 12 is a cross-sectional view of the range hood of fig. 11;

fig. 13 is an exploded view of the range hood of fig. 11;

fig. 14 is a schematic view of a collector ring of a three-way fan of a range hood according to the second embodiment;

fig. 15 is an exploded view of the collector of fig. 14;

fig. 16 is a sectional view of a third embodiment of the range hood of the present invention;

fig. 17 is a cross-sectional view of the range hood of fig. 16.

Detailed Description

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

Referring to fig. 1 to 6, a near-suction type range hood includes a housing 1, and hereinafter, for convenience of description, "front", "rear", "left", "right", "upper", "lower" refer to an orientation of the range hood with respect to a user when the range hood is in use, and are not limited in 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 disposed between the front ends of the two first side plates 11, 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 an opening 141 is formed in the inner panel 142 to form an air inlet of the range hood, preferably, the air inlet is located in 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 upper part of the front side of the panel 14 is provided with a smoke shielding screen 15, the lower part is provided with a baffle 18, the whole formed by the smoke shielding screen 15 and the baffle 18 is matched with the shape and the size of an outer panel 143, a certain angle is formed between the smoke shielding screen 15 and the inner panel 142 when the range hood works, and oil smoke enters the shell 1 from an air inlet after passing through the interval between the smoke shielding screen 15 and the inner panel 142. The panel 14 and the smoke barrier 15 are inclined at an angle to the horizontal, the baffle 18 may be flush with the outer panel 143, and the smoke barrier 15 corresponds to at least part of the air intake. Preferably, the smoke barrier 15 is rotatably coupled to the panel 14 and rotatable relative to the panel 14, and the baffle 18 is fixedly coupled to the panel 14.

When the range hood works, the smoke shielding screen 15 gradually leaves the panel 14 and rotates upwards to be opened until a certain angle of opening state is maintained, and the oil smoke can enter the shell 1. When the range hood stops working, the smoke blocking screen 15 moves downwards and rotates backwards to be pulled back to be close to the inner panel 142, at the moment, the air inlet is closed by the smoke blocking screen 15, and preferably, the smoke blocking screen 15 is flush with the outer panel 143 into a whole.

Through the smoke blocking screen 15, when the smoke blocking screen 15 is opened, the smoke blocking screen 15 can flexibly translate and rotationally lean against according to the size of the included angle on the front side of the shell 1, the smoke blocking screen 15 is opened more conveniently and more conveniently, the sealing effect is better, the smoke gathering area is larger, and the smoke gathering capacity is strong; when the kitchen ventilator is closed, the filter screen and the fan with greasy dirt can be hidden, so that the kitchen ventilator is clean and tidy, is convenient to clean, can prevent the smell of the lampblack, and has obvious improvement effect on the kitchen air environment.

A filter screen is arranged in the shell 1, and the filter screen can be arranged corresponding to the opening 141 of the shell 1 or can be arranged at the air inlet of the fan system. 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 barrier 15 and bottom panel 17 together define a cavity within the housing 1.

The fan system is arranged in the casing 1, in this embodiment, the fan system is a ternary fan 4, the ternary fan 4 can adopt the prior art, as disclosed in the patent of the applicant's application number 201620102790.9, and the 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 is oriented forward, corresponds to the opening 141 on the inner panel 142, and is placed in the cavity of the housing 1 obliquely to the horizontal direction.

In the present embodiment, it is preferable that the screens include a first screen 161 provided at the opening 141 of the inner panel 142 and a second screen 162 provided at the air intake 41 of the three-way fan 4.

The first filter 161 and the openings 141 may be square, and the first filter 161 includes a first filter body 1611 and first meshes 1612 formed on the first filter body 1611, and are densely distributed on the first filter body 1611, preferably in an array. The bottom end of the first filter screen body 1611 is provided with a downward extending insertion sheet 1613, while the top end of the first filter screen body 1611 is provided with a hollow connecting column 1614 extending into the shell 1, a jack 1422 matched with the insertion sheet 1613 is arranged at the position of the inner panel 142 located at the lower edge of the opening 141, and a positioning convex column 1423 protruding outwards of the shell 1 and matched with the connecting column 1614 is arranged at the position of the inner panel 142 located at the upper edge of the opening 141. The preferred tabs 1613, receptacles 1422, connecting posts 1614, and locating posts 1423 described above each have two spaced apart. The portion of the inner panel 142 where the locating boss 1423 is located may be recessed into the housing 1 relative to the remainder of the inner panel 142, thereby ensuring that the first screen 161 is mounted within the opening 141 and that the edge of the opening 141 is flush, i.e., substantially flush with the inner panel 142 to form a plane.

When the first filter screen 161 needs to be installed, the inserting piece 1613 can be inserted into the inserting hole 1422, and then the connecting post 1614 is fastened and fixed with the positioning post 1423 (the positioning post 1423 is fastened and fixed in the connecting post 1614 by designing the size of the connecting post and the positioning post so that the connecting post and the positioning post are fastened and then are tightly matched and fixed), thereby the first filter screen 161 is installed. When the first filter 161 needs to be disassembled, for example, when cleaning is performed, the upper portion of the first filter 161 can be pulled forward, so that the connecting post 1614 is separated from the positioning post 1423, and then the inserting piece 1613 is pulled out from the inserting hole 1422, thereby completing the disassembly of the first filter 161.

The second filter screen 162 is circular, and is adapted to the shape and size of the air inlet 41 of the three-way fan 4, and the second filter screen 162 comprises a second filter screen body 1621 and second mesh holes 1622 formed in the second filter screen body 1621, and is densely distributed on the second filter screen body 1621, preferably in an array. The second filter screen body 1621 may be connected to the tertiary fan 4 by a fastener such as a nut.

In the above filter screen structure, the first and second mesh holes 1612 and 1622 are circular holes, because the circular holes have the largest trapping volume for the low-frequency noise and can greatly reduce the noise generated when the oil smoke passes through the filter screen. Preferably, the aperture of each mesh (first mesh 1612 or second mesh 1622) is the same, and is 3mm to 8mm, and the interval between adjacent two meshes (the distance between the centers of the two meshes) is 2 to 3 times the aperture of the mesh. The meshes arranged in this way can not only ensure the air inlet area of the filter screen, but also prevent the greasy dirt from blocking the meshes. In addition, the filter screen can be matched with the noise reduction module, and the noise reduction module can increase the sound absorption bandwidth, so that the mesh can select the aperture, and better filtering effect and noise reduction effect can be achieved. When the ternary fan 4 operates, the oil smoke contacts with the filter screen before entering the negative pressure area formed in the shell 1, so that large-particle grease is adsorbed on the filter screen, and the large-particle grease is prevented from entering the ternary fan 4.

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. 8-12, 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.

Example two

Referring to fig. 13 to 15, in the present embodiment, the difference from the first embodiment is that 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 housing 1.

The air inlet 41 of the ternary fan 4 is oriented forward and is placed in the case 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, see fig. 16 and 17, 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, the inner ring 422 including an isolating 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 isolating 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. 16 and 17, in the present embodiment, the difference from the second embodiment described above 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 far away from the three-way fan, the diameter of the first sound absorption hole 771 formed in the top baffle 716 is 0.8 mm-3 mm, and only if the diameter of the first sound absorption hole 771 is reduced within the above range, the noise reduction module 7 can reach the frequency band limit.

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 (12)

1. The utility model provides a near-suction type range hood, includes casing (1) and fan system, casing (1) are panel (14) that inclines including being located the front end with the horizontal direction, offer opening (141) on panel (14) and become the air intake of range hood, its characterized in that: the fan system is a ternary fan (4), a filter screen is arranged at an air inlet (41) of the ternary fan (4) and/or an opening (141) on the panel (14), and circular meshes are formed in the filter screen;

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 plates forming the sound absorption back cavity of the noise reduction module (7) comprise a left baffle plate (711), a right baffle plate (712), a front baffle plate (713), a rear baffle plate (714), a bottom baffle plate (715) and a top baffle plate (716), the width of the top baffle plate (716) in the front and rear directions is larger than that of the bottom baffle plate (715), the top baffle plate (716) gradually inclines upwards from front to rear, and sound absorption holes are formed in the top baffle plate (716);

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);

the first resonant cavity (761) has a smaller cavity volume than the second resonant cavity (762).

2. The near suction type range hood according to claim 1, wherein: the filter screen comprises a first filter screen (161) arranged at an opening (141) on the panel (14) and a second filter screen (162) arranged at an air inlet (41) of the ternary fan (4), wherein the first filter screen (161) comprises a first filter screen body (1611) and first meshes (1612) densely distributed on the first filter screen body (1611), and the second filter screen (162) comprises a second filter screen body (1621) and second meshes (1622) densely distributed on the second filter screen body (1621).

3. The near suction range hood of claim 2, wherein: the bottom of first filter screen body (1611) is provided with downwardly extending inserted sheet (1613), and the top of first filter screen body (1611) is provided with hollow spliced pole (1614) that extend in to casing (1), jack (1422) with inserted sheet (1613) complex is seted up to the position that is located opening (141) lower limb of panel (14), the position that is located opening (141) upper limb of panel (14) is provided with protruding and spliced pole (1614) complex location projection (1423) outward to casing (1), makes first filter screen (161) and face (14) detachable connection from this.

4. The near suction type range hood according to claim 1, wherein: the aperture of each mesh is the same and is 3 mm-8 mm, and the distance between two adjacent meshes is 2-3 times of the aperture of the mesh.

5. The near suction range hood according to any one of claims 1 to 4, 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 arranged in the shell (1) obliquely with the horizontal direction, an air inlet (41) of the three-way fan (4) corresponds to an opening (141) in the panel (14), the noise reduction module (7) is arranged below the three-way fan (4) and is close to or clings 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 three-way fan (4) is obliquely arranged in the case (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).