WO2022021767A1 - 一种导风箱及应用有该导风箱的内循环吸油烟机 - Google Patents

一种导风箱及应用有该导风箱的内循环吸油烟机 Download PDF

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Publication number
WO2022021767A1
WO2022021767A1 PCT/CN2020/138767 CN2020138767W WO2022021767A1 WO 2022021767 A1 WO2022021767 A1 WO 2022021767A1 CN 2020138767 W CN2020138767 W CN 2020138767W WO 2022021767 A1 WO2022021767 A1 WO 2022021767A1
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WIPO (PCT)
Prior art keywords
side wall
wall
grid
air guide
guide box
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PCT/CN2020/138767
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English (en)
French (fr)
Inventor
蔡帆
叶冯旭
雷改
俞挺
王晓琼
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宁波方太厨具有限公司
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Application filed by 宁波方太厨具有限公司 filed Critical 宁波方太厨具有限公司
Priority to AU2020460634A priority Critical patent/AU2020460634B2/en
Priority to US17/776,228 priority patent/US20220381448A1/en
Publication of WO2022021767A1 publication Critical patent/WO2022021767A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound

Definitions

  • the invention relates to an oil fume purification device, in particular to an air guide box, and an internal circulation range hood applied with the air guide box.
  • Range hoods have become one of the indispensable kitchen appliances in modern homes.
  • the range hood uses the principle of fluid dynamics to work.
  • the centrifugal fan installed inside the range hood sucks and discharges the oil fume, and uses the filter screen to filter some grease particles.
  • the centrifugal fan includes a volute, an impeller installed in the volute, and a motor that drives the impeller to rotate. When the impeller rotates, a negative pressure suction is generated in the center of the fan, and the oil fume under the range hood is sucked into the fan. After being accelerated by the fan, it is collected by the volute and guided out of the fan cover.
  • range hoods can be divided into external exhaust type and internal circulation type.
  • the current internal circulation range hood mainly inhales the oil fume and air through the fan system, and then absorbs and filters it through the filter system in the whole machine, and then discharges the purified air into the room, because the exhaust air volume is large, such as direct discharge, it will be discharged. After the air flow is directly blown to the ceiling, it will form a rebound and return flow, which will interfere with the user's cooking after the air is supplied downward. Therefore, a box-type air outlet is generally added to pass the upward air from the air outlet through the box-type air outlet to make the air flow from bottom to top. It is then divided into left and right directions and discharged.
  • an internal circulation range hood disclosed in Chinese patent CN108800238A (patent number 201710294340.3), the internal circulation range hood can purify the oil fume into purified gas, and the range hood includes a collector for collecting and exporting the purified gas to the range hood.
  • a lead-out device, the collecting and exporting device includes an installation hanging plate, a decorative cover and a collecting structure arranged in the decorative cover, the decorative cover and the collecting structure are fixedly connected with the mounting hanging plate to form a collecting and exporting device.
  • the above-mentioned collecting and exporting device discharges the purified air flow through a simple fence structure, and the upper top of the air guide box forms a refraction of the air flow, and there is a phenomenon of downward blowing, which generates eddy currents and affects the user experience.
  • the airflow formed on the right side of the circular air inlet is a vortex; at the same time, after being discharged from the air guide box, it directly hits the cabinets on both sides and goes down the cabinets, and part of the oil fume blows along the top of the hood of the range hood. towards the operator's head, causing extreme operator discomfort.
  • the first technical problem to be solved by the present invention is to provide an air guide box for the deficiencies of the above-mentioned prior art, which can realize directional guide flow and reduce noise.
  • the second technical problem to be solved by the present invention is to provide an internal circulation range hood applying the above-mentioned air guide box.
  • an air guide box includes a box body, and the box body includes a first side wall and a second side wall arranged opposite to each other, and the first side wall is on the first side wall.
  • An air inlet is provided, and an air outlet is formed between the corresponding edges of the first side wall and the second side wall, and is characterized in that:
  • the second side wall is in a recessed structure toward the first side wall, the position corresponding to the second side wall and the air inlet is the maximum recessed position, and the second side wall is from the maximum recessed position to the direction of the air outlet, It is gradually inclined to the direction away from the first side wall, so that the second side wall faces the inner side of the first side wall and forms guide slopes from the maximum concave position to the edge respectively.
  • the box body is hexahedral to adapt to the installation environment, the box body further comprises a third side wall and a fourth side wall arranged oppositely, and the third side wall and the fourth side wall are respectively connected to the first side Between the corresponding edges of the wall and the second side wall, the air outlet has two corresponding ends formed in the space enclosed by the first side wall, the second side wall, the third side wall and the fourth side wall respectively .
  • each air outlet is provided with a grille, and each air outlet is provided with at least two grilles, and at least two grilles are arranged on the third side wall and the fourth side wall.
  • the side walls are arranged in sequence, and the grilles are covered with corresponding air outlets.
  • each grille includes a first grille wall and a second grille wall arranged at an angle, and the two grille walls respectively have The first end that is connected to each other and the second end that are far away from each other, the first grid wall gradually extends from the first end to the second end toward the inside of the box, and the second grid wall extends from the first end to the second end. The end gradually extends toward the inside of the box body toward the second end; a first through hole is formed on the first grid wall, and a second through hole is formed on the second grid wall.
  • the first grille wall is opposite from its own first end.
  • the second end is gradually inclined to the third side wall, and the length of the first grid wall is L1;
  • the second grid wall is gradually inclined to the fourth side wall from its first end to the second end, and the The length of the second grid wall is L2 and satisfies L1 ⁇ L2.
  • the first through hole and the second through hole are both circular holes, and the first through hole is a circular hole.
  • the diameter of the hole is larger than the diameter of the second through hole.
  • the projection of each second grid wall on the first side wall and the corresponding end of the first side wall is ⁇ , and the value of ⁇ ranges from 22° to 28°.
  • the distance between the fourth side wall and the end of the second grid wall of the grid closest to the fourth side wall is b, and the value range of b is less than or equal to 4 mm.
  • the direction of the airflow guided along the second grille wall is consistent with the opening direction of the first through hole, further ensuring that the airflow is discharged in a direction perpendicular to the first through hole, and at the same time, the sound wave transmission path is further extended , to further achieve the effect of reducing noise, the first grid wall and the second grid wall are perpendicular to each other, and the opening direction of the first through hole is perpendicular to the first grid wall.
  • the projections of the second grid walls of adjacent grids at the air outlet at least partially overlap.
  • an internal circulation range hood applying the above-mentioned air guide box, including a range hood body, and characterized in that: the air inlet of the air guide box The first side wall is located below the second side wall, and the air outlet is opened on the left and right sides of the box body.
  • the present invention has the advantages that: by arranging a guiding slope on the top surface of the air guide box, the air flow can be guided to the air outlet, avoiding the direct rebound of the air flow without guidance to generate eddy currents;
  • the angle-set grille can not only ensure directional flow, but also reduce noise by means of flow guide, increasing the sound wave propagation path, etc. Mechanical noise and eddy current noise are eliminated, so that the overall noise generated is relatively low.
  • FIG. 1 is a schematic diagram of an installation state of a range hood according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a range hood according to an embodiment of the present invention.
  • FIG. 3 is a top view of a range hood according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of an air guide box in an embodiment of the present invention.
  • FIG. 5 is a longitudinal cross-sectional view of an air guide box in an embodiment of the present invention.
  • FIG. 6 is a transverse cross-sectional view of an air guide box in an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a grille of an air guide box in an embodiment of the present invention.
  • FIG. 8 is a side view of an air guide box in an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a flow diversion simulation of a wind deflector in the prior art.
  • FIG. 10 is a schematic diagram of a simulation of flow diversion after the wind deflector according to the embodiment of the present invention is provided with an oblique upward flow diversion slope;
  • FIG. 11 is a schematic diagram of a flow guide simulation after the length and angle of the grille are set in the air guide box according to the embodiment of the present invention.
  • the internal circulation range hood includes a range hood body 1 , an air guide box 2 arranged above the range hood body 1 for exhausting smoke, and a decorative cover 3 arranged on the outer periphery of the air guide box 2 .
  • the air guide box 2 is directly or indirectly connected with the air outlet channel of the range hood body 1 through an air pipe, and guides the purified oil fume flow discharged from the range hood body 1 to the kitchen.
  • the air guide box 2 includes a box body 21, and the box body 21 is provided with an air inlet 211 and two air outlets 212.
  • the air guide box 2 is indirectly connected to the range hood body 1.
  • An air inlet duct 213 may be provided at the air outlet 211 for fluidly connecting the inside of the box body 21 with the smoke exhaust outlet (such as a common air outlet hood) of the range hood body 1 .
  • the air inlet pipe 213 is formed by extending downward from the bottom surface of the box body 21 , and the air outlet 212 has two oppositely arranged, respectively located on the left and right sides of the box body 21 .
  • a purified air outlet 31 is provided on the decorative cover 3 at a position corresponding to the air outlet 212 , so that the gas discharged from the air outlet 212 is discharged into the kitchen to form indoor air circulation.
  • the box body 21 is a hexahedron, preferably a hollow cuboid, and the box body 21 includes a first side wall 214, a second side wall 215, and a third side wall 217, which are arranged at opposite intervals up and down. and a fourth side wall 218 , wherein the third side wall 217 and the fourth side wall 218 are respectively connected with the corresponding edges of the first side wall 214 and the second side wall 215 .
  • the first side wall 214 constitutes the bottom of the box body 21
  • the second side wall 215 constitutes the top of the box body 21
  • the third side wall 217 constitutes the front side of the box body 21
  • the fourth side wall 218 constitutes the box body 21 .
  • the above-mentioned air inlet 211 is opened on the first side wall 214, and the left and right sides of the space enclosed by the first side wall 214, the second side wall 215, the third side wall 217 and the fourth side wall 218 are open to form the Two air outlets 212 , ie, two air outlets 212 are formed between the corresponding left and right edges of the first side wall 214 and the second side wall 215 , respectively.
  • the second side wall 215 is in a recessed structure toward the first side wall 214, wherein the position corresponding to the air inlet 211 is the maximum recessed position P, that is, the deepest recessed position P on the second side wall 215 is exactly the same as the inlet position P.
  • the second side wall 215 extends obliquely from the position corresponding to the air inlet 211 to the direction of the air outlet 212 and gradually to the direction away from the first side wall 214 .
  • the second side wall 215 faces the inner surface of the first side wall 214 and forms guide slopes 216 from the middle to both ends (left and right ends).
  • the guide slope 216 may be a plane or a curved surface.
  • the oblique upward air guide not only avoids the turbulent flow (vortex) phenomenon, but also the airflow is guided obliquely upward, and will go slightly downward during the process of exporting from the air outlet 212 of the box body 21.
  • This kind of overall first upward Compared with the existing horizontal direct blowing, the path that goes slightly downward increases the exhaust path of the airflow, the energy consumed by the airflow increases, and the noise generated by the airflow will be reduced.
  • Each air outlet 212 is provided with a grille 22 , and each air outlet 212 may be provided with at least two grilles 22 , and the at least two grilles 22 are sequentially arranged between the third side wall 217 and the fourth side wall 218 , and the grille 22 covers the entire air outlet 212 .
  • each grid 22 includes a first grid wall 221 and a second grid wall 222 arranged at an angle, and the two grid walls have a first end connected to each other and a second end remote from each other, respectively.
  • the grille 22 is an integral molding structure. In this embodiment, the two grid walls are perpendicular to each other, so that the grid 22 is L-shaped as a whole.
  • first through holes 223 are formed on the first grid wall 221
  • second through holes 224 are formed on the second grid wall 222 .
  • the first through holes 223 and the second through holes 224 are arranged in an array.
  • the first grid wall 221 gradually extends from the first end to the second end toward the inside of the box body 21, and the first grid wall 221 is gradually inclined toward the third side wall 217 from the first end relative to the second end.
  • the wall 222 gradually extends toward the inside of the box 21 from the first end to the second end, and the second grid wall 222 is gradually inclined toward the fourth side wall 218 from the first end to the second end. Since the airflow is led out obliquely upward along the second side wall 215 of the box body 21, the airflow forms a certain angle with the second through holes 224 on the second grid wall 222, and the airflow cannot be directly discharged from the second through holes 224, but It will be guided to the first grid wall 221 along the second grid wall 222 and discharged.
  • the angle between the projection of each second grid wall 222 on the first side wall 214 and the corresponding end of the first side wall 214 is ⁇ , and the value of ⁇ ranges from 22° to 28°. Within the range, it can be ensured that the eddy current phenomenon is not substantially generated at the second grid wall 222, and the eddy current is a major source of noise generation. If ⁇ is too small, in order to ensure the direction of the flow, since two adjacent grilles 22 must have overlapping parts, the distance between the two grilles 22 will also become smaller simultaneously, which will cause the resistance surface to be quickly encountered when the airflow is discharged. Increase the resistance and increase the resistance not only to increase the difficulty of exhaust air, but also to generate more noise.
  • the airflow will be directed from the distance between the fourth sidewall 218 and the grille 22 , the fourth sidewall 218 and the end of the second grille wall 222 of the grille 22 closest to the fourth sidewall 218
  • the distance between them is b.
  • the value range of b is less than or equal to 4 mm.
  • the airflow will also be derived from the distance b.
  • this direction of flow is not ideal.
  • ⁇ is too large, the ideal flow direction cannot be achieved, and the derived wind will blow the operator's head and cause turbulence in the flame of the cooker, which goes against the original intention of the design.
  • Improper length of the grid 22 or the absence of a grid can lead to eddy currents.
  • the airflow cannot be directed to the desired direction of the wind.
  • this air guide box eliminates the eddy current phenomenon to a great extent.
  • Eddy current in the fluid is a major source of noise. Eliminating the eddy current phenomenon is to eliminate a major source of noise, thereby achieving the purpose of reducing noise.
  • the arrangement of the first through hole 223 and the second through hole 224 can further achieve the purpose of noise reduction.
  • the air column in the hole reciprocates like a piston. Due to the damping effect of the hole wall on the air, Part of the sound is converted into heat.
  • the frequency of the incident sound wave is consistent with the natural frequency of the grille, resonance will occur.
  • the velocity of the air column in the hole is the largest, so the damping effect is the largest. In this case, the sound energy will be absorbed to the maximum. sound to achieve noise reduction.
  • the grille 22 is L-shaped.
  • the grille 22 in this form not only ensures the directional guide flow, but also increases the contact area between the grille 22 and the airflow, and ensures that the sum of the areas of all holes is equal to The area of the air outlet 212 in the state without the grille 22 is the same.
  • the frequency spectrum principle of jet noise if the total area of the nozzle is kept unchanged and replaced by many small nozzles, when the airflow passes through the small holes, the frequency spectrum of the jet noise will shift to high frequency or ultra-high frequency, so that the possible The listening component is significantly reduced, so as to achieve the purpose of reducing noise.
  • the first through hole 223 and the second through hole 224 are both circular holes, the diameter of the first through hole 223 is larger than that of the second through hole 224 , and the diameter of the first through hole 223 ranges from 3 mm to 5 mm. , the diameter of the second through hole 224 is less than or equal to 1.2 mm. Preferably, the diameter of the first through hole 223 is three times the diameter of the second through hole 224 . Due to the difference in aperture, the pressure relief capability of the second grille wall 222 of the grille 22 is weak, and the pressure relief capability of the first grille wall 221 is strong, ensuring that the airflow will be guided along the second grille wall 222 to the first grille wall 221. , discharged through the first through hole 223 .
  • the opening direction of the second through holes 224 on the second grill wall 222 (the opening direction of the second through holes 224 is perpendicular to the second grill wall 222 ) and the direction of the airflow also form an angle ⁇ , from the direction of the air guide box. Looking inward from the left and right sides, the inside of the air guide box cannot be seen through the second through holes 224, which ensures that the airflow will not be directly discharged through the second through holes 224 on the second grille wall 222, see FIG. 8, this ensures After the airflow is blown onto the second grill wall 222 , the airflow will basically be guided to the first grill wall 221 along the way.
  • the first grid wall 221 and the second grid wall 222 are perpendicular to each other, thereby reducing wind resistance.
  • the direction of the incoming airflow is consistent with the opening direction of the first through hole 223, which further ensures that the airflow is discharged in a direction perpendicular to the first through hole 223, and the discharge direction is inclined toward the third side wall 217 (obliquely forward).
  • the opening direction of the second through holes 224 on the second grille wall 222 also forms an angle ⁇ with the direction of the airflow, looking inward from the left and right sides of the air guide box, it is impossible to see the air guide box through the second through holes 224. Internally, this not only ensures the diversion requirements, but also further extends the sound wave transmission path.
  • the sound wave cannot be transmitted directly through the second through hole 224 on the second grid wall 222, and must be turned before entering the first through hole 223. After entering the first through hole 223, because it also forms a certain angle with the first through hole 223, it will be refracted several times in the first through hole 223 before it can be transmitted out, thus prolonging the transmission path of the sound wave and increasing the sound wave transmission path.
  • the collision probability consumes the energy of the sound wave, and further achieves the effect of reducing noise.
  • the air flow can be directed to the front and upper part under different distances between the cabinets 100 on both sides of the range hood, and the oil fume can be ensured to avoid the cabinets 100 on the left and right sides under the condition of ensuring no eddy current phenomenon.
  • the arrows show the path of the airflow out of the air guide box 2, and the airflow is discharged into the kitchen along the arrows to prevent the airflow from blowing to the user's head and causing turbulence in the flame of the cooker.
  • the left and right ends of the air deflector are equipped with upward diversion structures, which give the exhausted oil fume an upward lift, so as to ensure that the exhausted oil fume will not sink immediately and avoid blowing directly to the operator's head.
  • the "fluid communication” referred to in the present invention refers to the spatial positional relationship between two parts or parts (hereinafter collectively referred to as the first part and the second part respectively), that is, the energy of a fluid (gas, liquid or a mixture of the two) From the first part to flow along the flow path or/and to be transported to the second part, the first part and the second part can be directly connected, or the first part and the second part can pass through At least one third party is in indirect communication, which may be a fluid channel such as a pipe, channel, conduit, flow guide, hole, slot, etc., or a chamber that allows fluid to flow therethrough, or a combination thereof.
  • a fluid channel such as a pipe, channel, conduit, flow guide, hole, slot, etc.

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Abstract

一种导风箱，包括箱体(21)，箱体(21)包括相对设置的第一侧壁(214)和第二侧壁(215)，第一侧壁(214)上开设有进风口(211)，第一侧壁(214)和第二侧壁(215)的对应边缘之间分别形成出风口(212)，第二侧壁(215)中与进风口(211)对应的位置为最大凹陷位置(P)，第二侧壁(215)的内侧面形成有导向斜面(216)。一种应用有该导风箱的内循环吸油烟机。通过在导风箱的顶面设置导向斜面（216），能够将气流顺势导向出风口（212），避免了气流在无导向的情况下直接反弹而产生涡流。

Description

一种导风箱及应用有该导风箱的内循环吸油烟机 技术领域
本发明涉及油烟净化装置，尤其是一种导风箱，以及一种应用有该导风箱的内循环吸油烟机。
背景技术
吸油烟机已成为现代家庭中不可或缺的厨房家电设备之一。吸油烟机是利用流体动力学原理进行工作，通过安装在吸油烟机内部的离心式风机吸排油烟，并使用滤网过滤部分油脂颗粒。离心式风机包括蜗壳、安装在蜗壳中叶轮及带动叶轮转动的电机。当叶轮旋转时，在风机中心产生负压吸力，将吸油烟机下方的油烟吸入风机，经过风机加速后被蜗壳收集、引导排出风机罩外。
按油烟排放方式，吸油烟机可分为外排式和内循环式。当前的内循环吸油烟机，主要是通过风机系统将油烟与空气吸入，经过整机中过滤系统吸附过滤，再将净化后空气排放到室内，因为排放风量较大，如直接排放会使排出的空气气流直接吹向天花板后会形成反弹回流，向下送风后干扰用户烹饪，因此一般会加一个盒式出风装置，将出风口的向上空气通过盒式出风装置将气流自下而上后分成左右方向后排出。
如中国专利CN108800238A(专利号为201710294340.3)公开的一种内循环吸油烟机，内循环吸油烟机能够将油烟净化成净化气，吸油烟机包括用于将净化气收集并导出吸油烟机的收集导出装置，所述收集导出装置包括安装挂板、装饰罩和设置在装饰罩内的收集结构，所述装饰罩和收集结构均与所述安装挂板固定连接共同围合成收集导出装置。
上述这种收集导出装置(导风箱)，通过简单的栅栏式结构将净化后的气流排出，导风箱内上顶部形成了气流的折射，存在向下灌风的现象，产生涡流，影响用户体验，参见图9，圆形的进风口右侧形成的气流即为涡流；同时从导风箱排出后，直接撞上两侧橱柜，顺着橱柜往下，其中一部分油烟沿着油烟机集烟罩顶部吹向操作者头部，导致操作者极度不舒适。其中一部分油烟顺着橱柜与油烟机集烟罩左右两侧间间隙往下，吹动灶具火焰，导致出现火焰紊流现象，影响烹饪效果；此外，无降噪设计，产生的噪音较大。
发明内容
本发明所要解决的是第一个技术问题是针对上述现有技术的不足，提供一种导风 箱，实现定向导流，并且减小噪音。
本发明所要解决的是第二个技术问题是提供一种应用有上述导风箱的内循环吸油烟机。
本发明解决上述第一个技术问题所采用的技术方案为：一种导风箱，包括箱体，所述箱体包括相对设置的第一侧壁和第二侧壁，所述第一侧壁上开设有进风口，所述第一侧壁和第二侧壁的对应边缘之间分别形成出风口，其特征在于：
所述第二侧壁呈向第一侧壁方向凹陷的结构，所述第二侧壁与进风口对应的位置为最大凹陷位置，所述第二侧壁从最大凹陷位置至出风口的方向、逐渐向远离第一侧壁的方向倾斜，使得第二侧壁朝向第一侧壁的内侧面、由最大凹陷位置向边缘分别形成导向斜面。
优选地，箱体呈六面体，以适配安装环境，所述箱体还包括相对设置的第三侧壁和第四侧壁，所述第三侧壁、第四侧壁分别连接在第一侧壁和第二侧壁对应的边缘之间，所述出风口具有两个、分别形成在第一侧壁、第二侧壁、第三侧壁和第四侧壁围成的空间的相应端部。
为便于对经过出风口的气流进行导向和降噪，每个出风口处设置有格栅，每一个出风口处设置有至少两个格栅，至少两个格栅在第三侧壁和第四侧壁之间依次布置，并且格栅布满相应的出风口。
进一步地，为保证定向导流，同时与气流的接触面积，达到降低噪音的目的，每个格栅包括成角度设置的第一格栅壁和第二格栅壁，两个格栅壁分别具有互相连接的第一端和互相远离的第二端，所述第一格栅壁从自身的第一端向第二端逐渐向箱体内部延伸，所述第二格栅壁从自身的第一端向第二端逐渐向箱体内部延伸；所述第一格栅壁上开设有第一通孔，所述第二格栅壁上开设有第二通孔。
进一步地，为保证定向导流，同时延长声波传出时经过的路径被延长，增加声波与孔间碰撞次数增加，达到降低噪音的目的，所述第一格栅壁由自身的第一端相对第二端逐渐向第三侧壁倾斜，所述第一格栅壁的长度为L1；所述第二格栅壁由自身的第一端向第二端逐渐向第四侧壁倾斜，所述第二格栅壁的长度为L2，并且满足L1＜L2。
进一步地，为保证气流会沿着第二格栅壁导向第一格栅壁，通过第一通孔排出，所述第一通孔和第二通孔均为圆形孔，所述第一通孔的孔径大于第二通孔的孔径。
优选地，为确保在第二格栅壁处基本上不产生涡流现象，同时确保定向导流，每个第二格栅壁在第一侧壁上的投影与第一侧壁相应端部之间的夹角为α，α的取值范围为22°～28°。
为进一步确保定向导流，所述第四侧壁与最靠近第四侧壁的格栅的第二格栅壁端部之间的间距为b，b的取值范围小于等于4mm。
优选地，为减小风阻，保证顺着第二格栅壁导过来的气流方向与第一通孔开孔方向一致，进一步保证气流沿垂直于第一通孔方向排出，同时进一步延长声波传递路径，进一步到达降低噪音的效果，所述第一格栅壁和第二格栅壁互相垂直，所述第一通孔的开孔方向与第一格栅壁垂直。
进一步地，为确保从进风口进来的导流，均能通过格栅导向希望的方向，相邻格栅的第二格栅壁在出风口处的投影至少部分重叠。
本发明解决上述第二个技术问题所采用的技术方案为：一种应用有如上所述的导风箱的内循环吸油烟机，包括吸油烟机本体，其特征在于：所述导风箱的进风口与吸油烟机本体的排烟出口连接，所述第一侧壁位于第二侧壁的下方，所述出风口开设在箱体的左右两侧。
与现有技术相比，本发明的优点在于：通过在导风箱的顶面设置导向斜面，能够将气流顺势导向出风口，避免了气流在无导向的情况下直接反弹而产生涡流；通过采用呈角度设置的格栅形式，不仅能够确保定向导流，而且能够通过导流、增大声波传播路径等方式，起到降低噪音的目的，相对于常用导风箱，在同一使用条件下，通过结构降低了机械噪音和涡流噪音，从而使整体产生的噪音相对较低。
附图说明
图1为本发明实施例的吸油烟机的安装状态示意图；
图2为本发明实施例的吸油烟机的示意图；
图3为本发明实施例的吸油烟机的俯视图；
图4为本发明实施例中导风箱的示意图；
图5为本发明实施例中导风箱的纵向剖视图；
图6为本发明实施例中导风箱的横向剖视图；
图7为本发明实施例中导风箱的格栅的示意图；
图8为本发明实施例中导风箱的侧视图；
图9为现有技术的导风箱的导流仿真示意图；
图10为本发明实施例的导风箱设置斜向上导流斜面后的导流仿真示意图；
图11为本发明实施例的导风箱对格栅长度和角度进行设置后的导流仿真示意图。
具体实施方式
以下结合附图实施例对本发明作进一步详细描述。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽 度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，由于本发明所公开的实施例可以按照不同的方向设置，所以这些表示方向的术语只是作为说明而不应视作为限制，比如“上”、“下”并不一定被限定为与重力方向相反或一致的方向。此外，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。
参见图1和图2所示，为本发明的一种内循环吸油烟机的一个优选实施例。该内循环吸油烟机包括吸油烟机本体1、设置在吸油烟机本体1上方用于排烟的导风箱2以及设置在导风箱2外周的装饰罩3。
其中，吸油烟机本体1部分结构、导风箱2和装饰罩3位于橱柜100之间。导风箱2直接或者间接地通过风管与吸油烟机本体1的出风通道连接，将吸油烟机本体1中排出经过净化后的油烟气流导向后排向厨房。
参见图4～图6，导风箱2包括箱体21，箱体21上开设有进风口211和两个出风口212，在本实施例中，导风箱2与吸油烟机本体1间接连接，进风口211处可设置进风管213，用于将箱体21内部和吸油烟机本体1的排烟出口(如常用的出风罩)流体连通。安装状态下，进风管213由箱体21的底面向下延伸而形成，出风口212具有相对布置的两个，分别位于箱体21的左右两侧。装饰罩3上、与出风口212对应的位置开设有净化空气出口31，用于使得出风口212排出的气体排出到厨房内，形成室内空气循环。
在本实施例中，箱体21呈六面体，优选地为中空的长方体，箱体21包括上下相对间隔设置的第一侧壁214、第二侧壁215和前后相对间隔设置的第三侧壁217、第四侧壁218，其中，第三侧壁217、第四侧壁218分别与第一侧壁214和第二侧壁215的对应边缘相连。安装状态下，第一侧壁214构成箱体21的底部，第二侧壁215构成箱体21的顶部，第三侧壁217构成箱体21的前侧，第四侧壁218构成箱体21的后侧。上述的进风口211开设在第一侧壁214上，第一侧壁214、第二侧壁215、第三侧壁217和第四侧壁218围成的空间左右两侧开口，形成所述的两个出风口212，即，两个出风口212分别形成在第一侧壁214和第二侧壁215对应的左侧边缘和右侧边缘之间。
并且，第二侧壁215呈向第一侧壁214方向凹陷的结构，其中，与进风口211对应的位置为最大凹陷位置P，即，第二侧壁215上凹陷最深的位置P正好与进风口211相对应，第二侧壁215从与进风口211对应位置向出风口212的方向、逐渐向远离第一侧壁214的方向倾斜延伸。由此，第二侧壁215朝向第一侧壁214的内侧面、由中间向两端(左右两端)分别形成导向斜面216。导向斜面216可以为平面，也可以为曲面。
如图4中箭头所示，为气体流动方向，由此从进风口211由下至上进入的气流，利 用“附壁效应”能顺着导向斜面216导向斜上方，此外大概率上避免了气流吹到箱体21顶部，在无导向情况下直接反弹回去，产生紊流(涡流)现象，参见图10。
也就是说，斜向上导风不但避免了紊流(涡流)现象，同时气流斜向上导，在从箱体21的出风口212导出的过程中还会稍微向下走，这种整体先向上，后稍微向下走的路径，相对于现有的水平直吹，增加了气流排出路径，气流被消耗的能量增加，气流产生的噪音会降低。
每个出风口212处设置有格栅22，每一个出风口212处可设置有至少两个格栅22，至少两个格栅22在第三侧壁217和第四侧壁218之间依次布置，并且格栅22布满整个出风口212。结合图7，每个格栅22包括成角度设置的第一格栅壁221和第二格栅壁222，两个格栅壁分别具有互相连接的第一端和互相远离的第二端。格栅22为一体成型结构。在本实施例中，两个格栅壁互相垂直，从而使得格栅22整体呈L型。其中，第一个格栅壁221的长度(第一端和第二端互相平行、第一端和第二端之间的距离)为L1，第二格栅壁222的长度(第一端和第二端互相平行、第一端和第二端之间的距离)为L2，并且满足L1＜L2。第一格栅壁221上开设有第一通孔223，第二格栅壁222上开设有第二通孔224，，第一通孔223和第二通孔224均呈阵列布置。
第一格栅壁221从第一端向第二端逐渐向箱体21内部延伸，并且第一格栅壁221由第一端相对第二端逐渐向第三侧壁217倾斜，第二格栅壁222从第一端向第二端逐渐向箱体21内部延伸，并且第二格栅壁222从第一端向第二端逐渐向第四侧壁218倾斜。由于气流沿着箱体21的第二侧壁215倾斜向上导出，因此，气流与第二格栅壁222上的第二通孔224成一定角度，气流无法直接从第二通孔224排出，而是会沿着第二格栅壁222导向第一格栅壁221排出。而且，气流产生的噪音，由于气流流动方向与第一通孔223、第二通孔224成一定角度，声波传出时经过的路径被延长，声波与孔间碰撞次数增加，也达到了降低噪音的目的。
每个第二格栅壁222在第一侧壁214上的投影与第一侧壁214相应端部之间的夹角为α，，α的取值范围为22°～28°，在此角度范围内，可以保证在第二格栅壁222处基本上不产生涡流现象，而涡流是导致噪音生成的一大源头。如果α过小，则为保证导流方向，由于相邻两个格栅22必须有重叠部分，两个格栅22间的间距也会同步变小，会导致气流排出去时受到的阻力面会迅速加大，阻力加大不仅导致排风难度增加，更加会导致产生更大的噪音。如果α过大，气流会从第四侧壁218与格栅22之间的间距中导出，第四侧壁218与最靠近第四侧壁218的格栅22的第二格栅壁222端部之间的间距为b，优选地，b的取值范围小于等于4mm，如果b过大，也会导致气流从间距b中导出，然而此导流方向非理想导流方向。此外，α过大，无法达到理想的导流方向，导出的风会吹操作者头部以及导致灶具火焰出现紊流，违背设计初衷。
格栅22长度不合适或无格栅情况下会导致出现涡流现象。同时，在格栅22长度不合适或者无格栅情况下，无法将气流导向希望出风的方向。相邻格栅22的第二格栅壁222在出风口212处的投影至少部分重叠，从而保证从进风口21进来的气流，均能通过格栅22导向希望的方向，参见图11。
通过结构方面的优化设计，此导风箱在极大程度上消除了涡流现象。在流体内涡流是产生噪音的一大源头，消除涡流现象，就是消除产生噪音的一大源头，从而达到了降低噪音的目的。
上述第一通孔223和第二通孔224的设置，可以进一步到达降噪的目的，在声波的作用下，孔中的空气柱像活塞一样做往复运动，由于孔壁对空气的阻尼作用，部分声音转化为热能。当入射声波的频率与格栅的固有频率一致，就会产生共振现象，此时孔中的空气柱运动速度最大，因而阻尼作用最大，声能在此情况下将能得到最大的吸收，进行吸声，达到降噪目的。
在上文中，已经描述了格栅22呈L型，这种形式的格栅22，既保证了定向导流，又增大了格栅22与气流的接触面积，保证了所有孔的面积总和与不加格栅22状态下的出风口212面积一致。利用喷气噪声的频谱原理：如果保持喷口的总面积不变而用很多小喷口来替代，当气流经过小孔时，喷气噪音的频谱就会移向高频或超高频，使频谱中的可听声成分明显降低，从而达到降低噪音的目的。
第一通孔223和第二通孔224均为圆形孔，第一通孔223的孔径大于第二通孔224的孔径，第一通孔223的孔径的取值范围在3mm～5mm之间，第二通孔224的孔径≤1.2mm。优选地，第一通孔223的孔径为第二通孔224的孔径的3倍。因孔径差异，格栅22的第二格栅壁222处泄压能力弱，第一格栅壁221处泄压能力强，保证气流会沿着第二格栅壁222导向第一格栅壁221，通过第一通孔223排出。而且，第二格栅壁222上的第二通孔224开孔方向(第二通孔224开孔方向与第二格栅壁222垂直)与气流吹的方向也成角度α，从导风箱的左右两侧向内看，无法通过第二通孔224看到导风箱的内部，这样保证了气流不会直接通过第二格栅壁222上的第二通孔224排出，参见图8，这样保证了气流吹到第二格栅壁222上后基本均会顺着导到第一格栅壁221。第一格栅壁221和第二格栅壁222互相垂直，从而减小风阻，第一通孔223的开孔方向与第一格栅壁221垂直，这样保证顺着第二格栅壁222导过来的气流方向与第一通孔223开孔方向一致，进一步保证气流沿垂直于第一通孔223方向排出，排出的方向为倾斜地朝向第三侧壁217(斜向前)。
由于第二格栅壁222上的第二通孔224开孔方向与气流吹的方向也成角度α，从导风箱的左右两侧向内看，无法通过第二通孔224看到导风箱的内部，这样不仅保证了导流要求，同时也进一步延长的声波传递路径，声波无法直接通过第二格栅壁222上的第 二通孔224传出，必须经过转向后才能进入第一通孔223中，进入第一通孔223中后因与第一通孔223也成一定角度，在第一通孔223中会经过多次折射后才能传出去，这样就延长了声波传输路径，增加了其碰撞概率，消耗了声波能量，进一步到达降低噪音的效果。
通过上述的导风箱2的优化设计，在吸油烟机两侧橱柜100不同间距下均能保证将气流导向前上方，在保证不产生涡流现象情况下，保证油烟避开左右两侧橱柜100。参见图3，箭头显示了气流导出导风箱2时的路径，气流沿着箭头所示排到厨房中，避免出来的气流吹到用户头部及导致灶具火焰出现紊流现象产生。同时在格栅22如上设置长度、位置时，保证导出的气流仅沿箭头所示方向向前排到厨房中。再加上导风箱左右两端均做了向上导流结构，给排出的油烟一个向上的升力，从而保证排出的油烟不会立马下沉，避免直接吹到操作者头上。
本发明所称的“流体连通”是指两个部件或部位(以下统一分别称为第一部位、第二部位)之间的空间位置关系，即流体(气体、液体或两者的混合)能从第一部位沿着流动路径流动或/和被运送到第二部位，可以是所述的第一部位、第二部位之间直接相连通，也可以是第一部位、第二部位之间通过至少一个第三者间接连通，该第三者可以是诸如管道、通道、导管、导流件、孔、槽等流体通道、也可以是允许流体流过的腔室或以上组合。

Claims (11)

  1. 一种导风箱，包括箱体(21)，所述箱体(21)包括相对设置的第一侧壁(214)和第二侧壁(215)，所述第一侧壁(214)上开设有进风口(211)，所述第一侧壁(214)和第二侧壁(215)的对应边缘之间分别形成出风口(212)，其特征在于：
    所述第二侧壁(215)呈向第一侧壁(214)方向凹陷的结构，所述第二侧壁(215)中与进风口(211)对应的位置为最大凹陷位置(P)，所述第二侧壁(215)从最大凹陷位置(P)至出风口(212)、逐渐向远离第一侧壁(214)的方向倾斜，使得第二侧壁(215)朝向第一侧壁(214)的内侧面、由最大凹陷位置(P)向边缘分别形成导向斜面(216)。
  2. 根据权利要求1所述的导风箱，其特征在于：所述箱体(21)还包括相对设置的第三侧壁(217)和第四侧壁(218)，所述第三侧壁(217)、第四侧壁(218)分别连接在第一侧壁(214)和第二侧壁(215)对应的边缘之间，所述出风口(212)具有两个、分别形成在第一侧壁(214)、第二侧壁(215)、第三侧壁(217)和第四侧壁(218)围成的空间的相应端部。
  3. 根据权利要求2所述的导风箱，其特征在于：每个出风口(212)处设置有格栅(22)，每一个出风口(212)处设置有至少两个格栅(22)，至少两个格栅(22)在第三侧壁(217)和第四侧壁(218)之间依次布置，并且格栅(22)布满相应的出风口(212)。
  4. 根据权利要求3所述的导风箱，其特征在于：每个格栅(22)包括成角度设置的第一格栅壁(221)和第二格栅壁(222)，两个格栅壁分别具有互相连接的第一端和互相远离的第二端，所述第一格栅壁(221)从自身的第一端向第二端逐渐向箱体(21)内部延伸，所述第二格栅壁(222)从自身的第一端向第二端逐渐向箱体(21)内部延伸；所述第一格栅壁(221)上开设有第一通孔(223)，所述第二格栅壁(222)上开设有第二通孔(224)。
  5. 根据权利要求4所述的导风箱，其特征在于：所述第一格栅壁(221)由自身的第一端相对第二端逐渐向第三侧壁(217)倾斜，所述第一格栅壁(221)的长度为L1；所述第二格栅壁(222)由自身的第一端向第二端逐渐向第四侧壁(218)倾斜，所述第二格栅壁(222)的长度为L2，并且满足L1＜L2。
  6. 根据权利要求5所述的导风箱，其特征在于：所述第一通孔(223)和第二通孔(224)均为圆形孔，所述第一通孔(223)的孔径大于第二通孔(224)的孔径。
  7. 根据权利要求5所述的导风箱，其特征在于：每个第二格栅壁(222)在第一侧壁(214)上的投影与第一侧壁(214)相应端部之间的夹角为α，α的取值范围为22°～28°。
  8. 根据权利要求5所述的导风箱，其特征在于：所述第四侧壁(218)与最靠近第四侧壁(218)的格栅(22)的第二格栅壁(222)端部之间的间距为b，b的取值范围小于等于4mm。
  9. 根据权利要求5所述的导风箱，其特征在于：所述第一格栅壁(221)和第二格栅 壁(222)互相垂直，所述第一通孔(223)的开孔方向与第一格栅壁(221)垂直。
  10. 根据权利要求5所述的导风箱，其特征在于：相邻格栅(22)的第二格栅壁(222)在出风口(212)处的投影至少部分重叠。
  11. 一种应用有根据权利要求1～10中任一项所述的导风箱的内循环吸油烟机，包括吸油烟机本体(1)，其特征在于：所述导风箱的进风口(211)与吸油烟机本体(1)的排烟出口连接，所述第一侧壁(214)位于第二侧壁(215)的下方，所述出风口(212)开设在箱体(21)的左右两侧。
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