CN109595639B - Near-suction type range hood - Google Patents

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 comprises a first ternary fan and a second ternary fan which are arranged in parallel, the fan system is arranged in a case, at least two smoke guide plates are arranged on the front side of the panel and are arranged side by side and at intervals in the left-right direction, 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, and at least one of the smoke guide plates can stretch and retract relative to the panel, so that the smoke guide plates are close to the panel to close the air inlet channel or far away from the panel to open the air inlet channel. 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 comprises a first ternary fan and a second ternary fan which are arranged in parallel, the fan system is arranged in a case, at least two smoke guide plates are arranged on the front side of the panel and are arranged side by side and at intervals in the left-right direction, 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, and at least one of the smoke guide plates can stretch and retract relative to the panel, so that the smoke guide plates are close to the panel to close the air inlet channel or far away from the panel to open the air inlet channel.

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 is flat with the outer panel when closed.

In order to improve the problem of the diffusion of the fume, it is preferable that the fume guide plate comprises two first fume guide plates which can be extended and contracted relative to the panel and a second fume guide plate which is fixed relative to the panel and is positioned between the two first fume guide plates.

Because the ternary fan is high in efficiency and large in noise, the noise reduction module used for reducing noise generated by the fan system 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 baffle plate at the top of the noise reduction module is attached with sound absorption cotton, and a third sound absorption hole matched with the second sound absorption hole is formed in the sound absorption cotton.

For on the basis of not changing the machine case size, increase the amount of wind, first ternary fan includes first ternary impeller and first air intake, the ternary fan of second includes second ternary impeller and second air intake, on the oil smoke flow path, second air intake is equal with first air intake position, first air intake and second air intake set up side by side to the left and right sides of quick-witted case respectively.

Preferably, in order to reduce wind resistance and improve the oil fume absorbing effect on the premise of not increasing the size of the case, the first ternary impeller of the first ternary fan and the second ternary impeller of the second ternary fan respectively form 60-90 degrees with the horizontal direction, and the two ternary impellers incline towards opposite directions.

According to one aspect of the invention, the first ternary fan further comprises a first volute, the first ternary impeller is arranged in the first volute, the second ternary fan further comprises a second volute, the second ternary impeller is arranged in the second volute, the first volute and the second volute are arranged at intervals and side by side, the first air inlet is formed in the first volute, the second air inlet is formed in the second volute, a first oil smoke channel is formed in the first volute, a first air outlet is formed at the top end of the first oil smoke channel, a second oil smoke channel is formed in the second volute, and a second air outlet is formed at the top end of the second oil smoke channel.

According to another aspect of the invention, the first ternary impeller and the second ternary impeller are arranged at intervals and side by side in the same volute, a first air inlet corresponding to the first ternary impeller and a second air inlet corresponding to the second ternary impeller are respectively formed at two opposite sides of the volute, a mounting plate is arranged between the first ternary impeller and the second ternary impeller and extends to the top end of the volute, so that the interior of the volute is divided into two independent first oil smoke channels and second oil smoke channels, the top end of each first oil smoke channel forms a first air outlet, and the top end of each second oil smoke channel forms a second air outlet.

In order to drive two impellers simultaneously, the device further comprises a driving motor arranged between the first ternary impeller and the second ternary impeller, and the driving motor is provided with double output shafts for driving the first ternary impeller and the second ternary impeller respectively.

For playing the water conservancy diversion effect to the gas of the corresponding export of two ternary fans, be favorable to the outlet gas to form laminar flow to reduce flow loss by a wide margin, raise the efficiency, fan system's air outlet department is provided with the air-out cover, the air-out cover is including being the cover body of cavity tube-shape, the cover body has relative, open-ended first end and second end, the bore of first end is greater than the bore of second end, its characterized in that: the novel three-dimensional air diffuser is characterized in that a first guide plate and a second guide plate are arranged in the cover body, each guide plate extends from the first end of the cover body to the second end, a first diffusion flow passage is formed between the first guide plate and the inner side wall of the cover body, a second diffusion flow passage is formed between the second guide plate and the inner side wall of the cover body, the sectional areas of the first diffusion flow passage and the second diffusion flow passage are gradually reduced from the first end of the cover body to the second end of the cover body respectively, the first diffusion flow passage corresponds to the first air outlet of the first three-dimensional air blower at the first end of the cover body, and the second diffusion flow passage corresponds to the second air outlet of the second three-dimensional air blower at the first end of the cover body.

Compared with the prior art, the invention has the advantages that: when the range hood does not work, the filter screen and the fan system which can hide greasy dirt are closed by the smoke guide plate, so that the range hood is kept clean and tidy; when the range hood works, the smoke guide plate is opened to play a role in guiding air around the shell, so that the airflow passing through the outer rectifying layer can be effectively divided, rectified and guided, turbulence and turbulence in the airflow are reduced, smooth airflow is formed, namely, the smoke collection area of the shell is increased, and the smoke exhaust effect of the range hood can be better improved; 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 two ternary fans, the structure of the fan is compact, the size is relatively small, the efficiency of the fan and the air pressure are high, the generated negative pressure gradient is large, and the smoking efficiency can be greatly improved; the whole volume of the fan formed after parallel connection is smaller, the original size of the case is not required to be changed, the air quantity can be doubled under the condition of keeping higher air pressure, and the oil fume suction efficiency is improved; the two air inlets face to the left side and the right side respectively, so that the area of the negative pressure areas on the periphery of the two sides is increased, the two air inlets are suitable for two cooking tops, the effect of no smoke leakage is achieved, the noise propagation path does not face to a user, and the noise is reduced.

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 cross-sectional view of a fan system and an outlet hood of the range hood of fig. 1;

fig. 10 is a schematic view of an outlet hood of the range hood of fig. 1;

fig. 11 is a schematic view of a second embodiment of a fan system of the range hood of the present invention;

fig. 12 is a cross-sectional view of a fan system and an outlet hood of the range hood of fig. 11.

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-guiding plate 15 may include a movable first smoke-guiding plate 152 and a fixed second smoke-guiding plate 153, or may be both movable first smoke-guiding plates 152. In this embodiment, preferably, the number of the smoke guide plates 15 is three, wherein the first smoke guide plates 152 are movable on the left and right sides, the second smoke guide plates 153 are fixed between the two first smoke guide plates 152, and the height difference is formed between the first smoke guide plates 152 and the second smoke guide plates 153, so that the effect of the diffusion and drainage device as described in the chinese patent application No. 201310627395.3 of the applicant is formed, and the problem of oil smoke diffusion is greatly improved.

The first smoke guide 152 is connected to the inner panel 142 by a telescopic rod 154, and the second smoke guide 153 is connected and fixed to the inner panel 142 or the filter screen 16 by a mounting bracket 155. The telescopic movement of the telescopic rod 154 may be performed by a conventional technique, and a driving mechanism such as an electric push rod may be provided in the housing 1 to drive the telescopic rod 154.

The state that the smoke guide plate 15 is opened is shown in fig. 1, when the range hood is not in operation, the smoke guide plate 15 can move to the inner direction of the shell 1 to be closed, the air inlet channel 151 is closed, the lower space of the shell 1 is covered, and the filter screen 16 and a fan system with greasy dirt are hidden, so that the range hood is kept clean and tidy; when the range hood works, the smoke guide plate 15 moves to open towards the outer direction of the shell 1, and the air inlet channel 151 is opened, so that the drainage effect on the air around the shell 1 can be achieved, namely, the smoke collecting area of the shell 1 is increased, and the smoke discharging effect of the range hood can be improved well.

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. The cavity enclosed between the second side plates 21 forms an air duct 25 through which the oil smoke passes.

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

In this embodiment, a fan system 4 is disposed in the chassis 2, and preferably, the fan system 4 is a three-way fan, and the three-way fan can be in the prior art, as disclosed in chinese patent with application No. 201310418009. The fan system 4 can be a single ternary fan, two ternary fans connected in parallel or two ternary fans connected in series, and the ternary fans have the characteristics of compact structure, relatively small size, high fan efficiency and high wind pressure, so that the negative pressure gradient can be generated, and the smoking efficiency can be greatly improved. The specific structure of the fan system 4 will be described in detail below. An air outlet cover 5 connected with an air outlet of the fan system 4 is arranged above the case 2, so that the oil smoke can be discharged into a public flue through the air outlet cover 5.

Because the three-way fan has larger noise and wide noise frequency band, the noise reduction module 7 is preferably arranged below the fan system 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 cylinder (the upper size and the lower size).

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 1 mm-5 mm, because the noise reduction module 7 has a certain interval with the first ternary fan 41, the noise frequency band is extremely wide, and the noise reduction module 7 can reach the sound absorption frequency band limit only by reducing the diameter of the first sound absorption holes 771 within the above range. The second sound absorbing holes 772 have a larger aperture than the first sound absorbing holes 771.

The top baffle 716 is attached with sound absorbing cotton 781, and the sound absorbing cotton 781 is provided with a third sound absorbing hole 773 matched with the second sound absorbing hole 772, so that the sound absorbing cotton is matched with the sound absorbing back cavity to increase the sound absorption coefficient of low-frequency noise.

On the noise propagation path below the three-way fan, the left side position is mainly high-frequency noise, so that the cavity volume of the first resonant cavity 761 is smaller than that of the second resonant cavity 762, namely, 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, so that the sound absorption coefficient of the medium-frequency noise is increased. 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 three-way fan has a good inhibition effect on radiation noise of the three-way fan, 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.

Referring to fig. 9 and 10, in the present embodiment, the fan system 4 includes two independently operable first and second three-way fan systems 41 and 42, which are disposed in parallel. By using the ternary impeller, compared with a centrifugal fan, the flow efficiency can be greatly increased, and the air quantity can be improved.

The first tertiary fan system 41 includes a first volute 411 and a first tertiary impeller 412 disposed within the first volute 411, and the second tertiary fan system 42 includes a second volute 421 and a second tertiary impeller 422 disposed within the second volute 421. The first volute 411 and the second volute 421 are arranged side by side at intervals, a first air inlet 413 is formed on the first volute 411, a second air inlet 423 is formed on the second volute 421, the air inlets of the two volutes are far away from each other, namely, the air inlet 313 of the first volute 411 is formed on one side far away from the second volute 421, the two volutes are arranged back to back, so that the two three-way fans are arranged side by side left and right, and the first air inlet 413 faces the left side of the case 2, and the second air inlet 423 faces the right side of the case 2. When the fume enters from the fume collecting hood 1, the fume enters into the fan system 4 from the left side and the right side respectively. A first oil smoke channel 441 is formed in the first volute 411, a first air outlet 414 is formed at the top end of the first oil smoke channel 441, a second oil smoke channel 442 is formed in the second volute 421, a second air outlet 424 is formed at the top end of the second oil smoke channel 442, and the first air outlet 414 and the second air outlet 424 are arranged side by side at intervals.

The first tertiary impeller 412 and the second tertiary impeller 422 may employ prior art techniques, such as those disclosed in applicant's application number 201620102790.9. The first and second three-way impellers 412 and 422 share the same driving motor 43, the driving motor 43 is disposed between the first and second volutes 411 and 421, and the driving motor 43 has a double output shaft, so that the output shaft 431 extending leftwards may be connected to the first three-way impeller 412 to drive the first three-way impeller 412 to operate, and the output shaft 431 extending rightwards may be connected to the second three-way impeller 422 to drive the second three-way impeller 422 to operate. Therefore, the two ternary fans have good synchronism, and meanwhile, energy sources can be saved.

The first and second three-way impellers 412 and 422 may respectively form 60 to 90 ° with the horizontal direction, and the two impellers are inclined in opposite directions (the first three-way impeller 412 is inclined to the left and the second three-way impeller 422 is inclined to the right), thereby reducing wind resistance and improving the oil fume absorbing effect. The center of the first ternary impeller 412 is kept at a certain distance from the inlet of the air duct 25 of the range hood, which is 1-2 times the diameter of the first ternary impeller 412, the center of the second ternary impeller 422 is kept at a certain distance from the inlet of the air duct 25 of the range hood, which is 1-2 times the diameter of the second ternary impeller 422, and the distance between the center of the impeller and the inlet of the air duct 25 must be greater than the diameter of the impeller, so that the rotary filter screen 6 at the inlet of the air duct 25 can only work, but cannot be greater than 2 times the diameter, otherwise the distance from the negative pressure area is too far.

The two ternary fans can adopt the same structure, and the overall size of the fan system is smaller in the arrangement mode, so that the original size of the case 2 is not changed, the air quantity can be doubled under the condition of keeping higher air pressure, and the oil fume suction efficiency is improved. The two air inlets face to the left and the right sides respectively, so that the area of the negative pressure areas at the periphery of the two sides is increased, the two air inlets are suitable for two cooking heads, and the effect of no smoke leakage is achieved; the noise propagation path is directed to the left and right sides, not toward the user as in the prior art, thereby reducing noise.

An air outlet cover 5 is arranged above the fan system 4, and a cover body 51 of the air outlet cover 5 covers a first air outlet 414 of a first volute 411 of the first ternary fan system 41 and a second air outlet 424 of a second volute 421 of the second ternary fan system 42 and are communicated. In this embodiment, the air outlet cover 5 includes a cover body 51 and a deflector disposed in the cover body 51. The hood 51 is hollow and cylindrical, and has opposite first and second ends 511 (lower and upper ends) and 512, the first end 511 having a larger diameter than the second end 512, i.e., the opening gradually decreases from a position closer to the fan system 4 to a position farther from the fan system 4, and the flow of soot enters the hood 51 from the first end 511 and exits the hood 51 from the second end 512 into an external duct connected to the exhaust hood 5.

The baffle includes a first baffle 521 and a second baffle 522, the first baffle 521 extending from the first end 511 to the second end 512 of the shroud 51, and the first baffle 521 corresponding at the first end 511 of the shroud 51 to a first edge 415 (right edge of the first air outlet) of the first tertiary fan system 41 proximate to the second air outlet 424 of the second tertiary fan system 42, at the first air outlet 414 of the first tertiary fan system 41, and the second baffle 522 corresponding at the first end 511 of the shroud 51 to a second edge 425 (left edge of the second air outlet) of the second tertiary fan system 42 proximate to the first air outlet 414 of the first tertiary fan system 41. Each baffle has a width extending in the front-to-rear direction. The first baffle 521 is gradually inclined toward the second baffle 522 (rightward) from the first end 511 to the second end 512, and the second baffle 522 is gradually inclined toward the first baffle 521 (leftward) from the first end 511 to the second end 512, i.e., each baffle extends from a position offset from the middle of the bottom of the casing 51 toward a position in the middle of the top of the casing 51. The top ends of the first baffle 521 and the second baffle 522 (near the second end 512 of the shroud 51) are connected to each other, and preferably, the connection between the two baffles is rounded, so as to guide the air flow to smoothly transition.

The front and rear side edges 5211, 5212 of the first baffle 521 are always connected to the inner side wall of the cover 51, and the front and rear side edges 5221, 5222 of the second baffle 522 are always connected to the inner side wall of the cover 51. The interior of the housing 51 is thus divided into a first diffusion flow passage 531 between the inner side wall of the housing 51 and the first baffle 521, and a second diffusion flow passage 532 between the inner side wall of the housing 51 and the second baffle 522, the first diffusion flow passage 531 and the second diffusion flow passage 532 being independent of each other. The first diffuser 531 corresponds to the first air outlet 414 of the first tertiary fan system 41 at the first end 511 of the shroud 51, i.e., completely covers the first air outlet 414, and the second diffuser 532 corresponds to the second air outlet 424 of the second tertiary fan system 42 at the first end 511 of the shroud 51, i.e., completely covers the second air outlet 424. The cross-sectional area of the first diffusion flow channel 531 gradually decreases from the first end 511 to the second end 512, and the cross-sectional area of the second diffusion flow channel 532 gradually decreases from the first end 511 to the second end 512, so that the outlet speed at the top of the first diffusion flow channel 531 is greater than the outlet speed at the bottom of the first diffusion flow channel 531, and the outlet speed at the top of the second diffusion flow channel 532 is greater than the outlet speed at the bottom of the second diffusion flow channel 532.

By providing the above-described baffle, the air flow speeds of the first diffuser 531 communicating with the first air outlet 414 of the first three-way fan system 41 and the second diffuser 42 communicating with the second air outlet 424 of the second three-way fan system 42 are made close to each other. The diversion effect of the air outlet cover 5 is beneficial to the formation of laminar flow of the outlet air, and the air enters the external pipeline after forming the laminar flow, so that the defect that the air flow directly enters the external pipeline in a turbulent state after exiting from the volute is avoided, and the strong friction and impact during the mixing of the air flows at the air outlets of the two three-way fans are also avoided, thereby greatly reducing the flow loss and improving the efficiency.

The sound absorbing holes 54 are densely distributed on the first baffle 521 and/or the second baffle 522, which is beneficial to reducing outlet noise. To further reduce noise, a partition 55 may be further provided in the space between the first and second baffles 521 and 522 such that the space between the first and second baffles 521 and 522 is partitioned into at least two resonant cavities 551. Alternatively, sound absorbing cotton may be provided in a space between the first baffle 521 and the second baffle 522. Alternatively, the baffle 55 may be replaced with a reinforcing rib to enhance the strength of the baffle.

Example two

Referring to fig. 11 and 12, in the present embodiment, the difference from the first embodiment described above is that the first tertiary fan system 41 and the second tertiary fan system 42 share the same volute 44, that is, the first tertiary impeller 412 of the first tertiary fan system 41 and the second tertiary impeller 422 of the second tertiary fan system 42 are disposed together in the same volute 44.

A mounting plate 45 is provided between the two three-way impellers so as to separate the two three-way impellers on both sides of the mounting plate 45, and the mounting plate 45 extends to the top end of the volute 44 so as to separate the interior of the volute 44 into two independent first oil smoke channel 441 and second oil smoke channel 442. The driving motor 43 passes through the mounting plate 45 and is fixedly connected with the mounting plate 45.

In the present embodiment, the air outlet cover 5 includes only the cover body 51 and the baffle 56 disposed in the cover body 51, the baffle 56 extends in the flow direction of the oil smoke, and in the present embodiment, the baffle 56 is located corresponding to the mounting plate 45 so as to partition the cover body 51 into the independent first diffuser 531 and the second diffuser 532 corresponding to the oil smoke passage in the volute 44.

Alternatively, the air outlet cover 5 may also adopt the structure of the first embodiment.

Claims (13)

1. The utility model provides a near-suction type range hood, includes casing (1), is located quick-witted case (2) and fan system (4) 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 comprises a first ternary fan (41) and a second ternary fan (42) which are arranged in parallel, the fan system (4) is arranged in a 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, 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), and at least one of the smoke guide plates (15) can stretch and retract relative to the panel (14) so as to close the air inlet channel (151) close to the panel (14) or open the air inlet channel (151) away from the panel (14);

a noise reduction module (7) for reducing noise generated by the fan system (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, wherein: the smoke guide plate (15) comprises two first smoke guide plates (152) which can stretch relative to the panel (14) and second smoke guide plates (153) which are fixed relative to the panel (14), and the second smoke guide plates (153) are positioned between the two first smoke guide plates (152).

4. A near suction type range hood according to any one of claims 1 to 3, 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).

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

6. A near suction type range hood according to any one of claims 1 to 3, 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).

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

8. The near suction type range hood according to claim 1, wherein: the first ternary fan (41) comprises a first ternary impeller (412) and a first air inlet (413), the second ternary fan (42) comprises a second ternary impeller (422) and a second air inlet (423), on the oil smoke flow path, the second air inlet (423) is identical to the first air inlet (413) in position, and the first air inlet (413) and the second air inlet (423) are arranged in parallel and respectively face the left side and the right side of the case (2).

9. The near suction type range hood according to claim 8, wherein: the first ternary impeller (412) of the first ternary fan (41) and the second ternary impeller (422) of the second ternary fan (42) are respectively 60-90 degrees with the horizontal direction, and the two ternary impellers are inclined towards opposite directions.

10. The near suction type range hood according to claim 8, wherein: the first ternary fan (41) further comprises a first volute (411), the first ternary impeller (412) is arranged in the first volute (411), the second ternary fan (42) further comprises a second volute (421), the second ternary fan (422) is arranged in the second volute (421), the first volute (411) and the second volute (421) are arranged at intervals and side by side, the first air inlet (413) is formed in the first volute (411), the second air inlet (423) is formed in the second volute (421), a first oil smoke channel (441) is formed in the first volute (411), a first air outlet (414) is formed in the top end of the first oil smoke channel (441), a second oil smoke channel (442) is formed in the second volute (421), and a second air outlet (424) is formed in the top end of the second oil smoke channel (442).

11. The near suction type range hood according to claim 8, wherein: the first ternary impeller (412) and the second ternary impeller (422) are arranged at intervals and side by side in the same volute (44), a first air inlet (413) corresponding to the first ternary impeller (412) and a second air inlet (423) corresponding to the second ternary impeller (422) are respectively formed on two opposite sides of the volute (44), a mounting plate (45) is arranged between the first ternary impeller (412) and the second ternary impeller (422), the mounting plate (45) extends to the top end of the volute (44), so that the volute (44) is internally divided into two independent first oil smoke channels (441) and second oil smoke channels (442), the top end of each first oil smoke channel (441) forms a first air outlet (414), and the top end of each second oil smoke channel (442) forms a second air outlet (424).

12. The near suction type range hood according to claim 10, wherein: the motor (43) is arranged between the first ternary impeller (412) and the second ternary impeller (422), and the motor (43) is provided with double output shafts for driving the first ternary impeller (412) and the second ternary impeller (422) respectively.

13. The near suction type range hood according to claim 10, wherein: an air outlet cover (5) is arranged at an air outlet of the fan system (4), the air outlet cover (5) comprises a cover body (51) which is hollow and cylindrical, the cover body (51) is provided with a first end (511) and a second end (512) which are opposite and open, the caliber of the first end (511) is larger than that of the second end (512), a first guide plate (521) and a second guide plate (522) are arranged in the cover body (51), each guide plate extends from the first end (511) to the second end (512) of the cover body (51), a first diffusion flow channel (531) is formed between the first guide plate (521) and the inner side wall of the cover body (51), a second flow channel (532) is formed between the second guide plate (522) and the inner side wall of the cover body (51), the diffusion sectional areas of the first diffusion flow channel (531) and the second diffusion flow channel (532) are gradually reduced from the first end (511) to the second end (512) of the cover body (51) respectively, the diffusion sectional areas of the first diffusion flow channel (531) and the inner side wall of the first diffusion channel (51) are correspondingly reduced from the first end (511) to the second end (512) of the fan, the second diffusion flow passage (532) corresponds to the second air outlet (424) of the second ternary fan (42) at the first end (511) of the cover body (51).