Range hood

Abstract

The present application relates to a range hood, comprising a shell and a smoke collecting chamber, wherein the shell comprises: a raised portion, which is extended outwardly along the surface of the shell and is hollow inside, connected to the smoke collecting chamber, and is configured to buffer and decelerate the airflow in the smoke collecting chamber to make the air pressure uniform. The range hood of the present application allows the oil smoke to be drawn away from the inner side of the smoke collecting hood, the smoke collecting chamber is arranged between the shell and the smoke collecting hood, and the airflow sent out of the air outlet of the smoke collecting chamber forms a smoke collecting air curtain at the periphery of the smoke collecting hood to enhance the effect of sucking the oil smoke, and the shell is provided with a raised portion which is hollow inside and connected to the smoke collecting chamber, so that when the airflow passes through the smoke collecting chamber, the pressure of the air curtain airflow is adjusted by flowing along the raised portion, so that the air curtain airflow flows out of the air outlet to form a stable smoke collecting air curtain, thereby improving the smoke collecting effect.

Description

Technical Field

[0001] The present application relates to the technical field of oil fume treatment equipment, for example, to a range hood. Background Art

[0002] The range hood is installed above the kitchen stove. It can quickly extract the waste from stove combustion and the oil smoke generated during cooking that is harmful to the human body and discharge it outdoors. At the same time, it condenses and collects the oil smoke to reduce pollution and purify the air. At present, as the height of high-rise buildings increases, the flue resistance and high-altitude wind resistance of kitchen range hoods continue to increase, which often manifests as insufficient air volume and pressure, resulting in poor oil smoke suction and smoke leakage. Some range hoods are equipped with a smoke collection chamber on the outside of the smoke collection chamber. By supplying air to the smoke collection chamber, the air outlet of the smoke collection chamber forms a smoke collection air curtain on the periphery of the smoke collection chamber, so as to form a negative pressure area at the smoke inlet of the smoke collection chamber, so as to achieve effective smoking.

[0003] In the process of implementing the embodiments of the present disclosure, it was found that at least the following problems exist in the related art: the air outlet pressure formed after the airflow passes through the smoke collecting chamber is uneven, resulting in uneven distribution of the smoke collecting air curtain, thereby reducing the smoke collecting effect. Summary of the invention

[0004] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0005] The disclosed embodiment provides a range hood to solve the technical problem of uneven distribution of the smoke-collecting air curtain caused by uneven air outlet pressure formed after the airflow passes through the smoke-collecting cavity.

[0006] In some embodiments, the above-mentioned range hood includes a shell and a smoke collecting chamber, and the shell includes: a raised portion, which extends outward along the surface of the shell and is hollow inside, connected to the smoke collecting chamber, and is configured to buffer and slow down the airflow in the smoke collecting chamber to make the air pressure uniform.

[0007] The range hood provided by the disclosed embodiment can achieve the following technical effects: the oil smoke is sucked away from the inner side of the smoke collecting hood, and a smoke collecting chamber is arranged between the outer shell and the smoke collecting hood. The airflow delivered from the air outlet of the smoke collecting chamber forms a smoke collecting air curtain on the outer periphery of the smoke collecting hood to enhance the effect of sucking the oil smoke. The outer shell is provided with a raised portion which is hollow inside and connected to the smoke collecting chamber, so that when the airflow passes through the smoke collecting chamber, it flows along the raised portion to adjust the pressure of the air curtain airflow, so that the air curtain airflow flows out from the air outlet to form a stable smoke collecting air curtain, thereby improving the smoke collecting effect.

[0008] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0010] Figure 1 is a structural schematic diagram of a range hood provided by an embodiment of the present disclosure;

[0011] Figure 2 is a schematic diagram of the principle of the range hood provided by the embodiment of the present disclosure;

[0012] Figure 3 is a schematic diagram of the structure of the air supply mechanism provided in an embodiment of the present disclosure;

[0013] Figure 4 is a cross-sectional view of an air supply mechanism provided in an embodiment of the present disclosure;

[0014] Figure 5 is a cross-sectional view of an air supply mechanism provided by another disclosed embodiment;

[0015] Figure 6 is a cross-sectional view of a smoke-collecting air curtain structure provided by an embodiment of the present disclosure;

[0016] Figure 7 It is an enlarged view of part B of the smoke-collecting air curtain structure provided in an embodiment of the present disclosure.

[0017] Reference numerals:

[0018] 1: main fan; 2: fixed pipe; 3: air outlet interface component; 4: inner tube; 5: smoke hood; 6: outer shell; 61: raised part; 62: inclined part; 63: vertical part; 7: air supply mechanism; 8: smoke collecting chamber; 9: smoke gathering air curtain; 10: wind wheel; 11: driving mechanism; 12: impeller; 13: bearing; 101: outer ring; 102: inner ring; 103: blades; 111: driving gear; 112: motor. DETAILED DESCRIPTION

[0019] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0020] The range hood of the present invention comprises a plurality of parts, such as Figure 1 ,2 As shown, a fixed pipe 2 connected to the air inlet of the main fan 1 and detachable during maintenance, through which the oil smoke is transported to the main fan 1; an air outlet interface component 3 connected to the outlet of the main fan 1, the air outlet interface component 3 is connected to the public flue through a pipeline; an inner cylinder 4 connected to the air inlet of the fixed pipe 2 and can slide up and down along the Y axis, and a smoke collecting hood 5 is fixedly connected below the inner cylinder 4 to form a smoke collecting chamber 8; a smoke collecting air curtain structure, wherein the smoke collecting air curtain structure includes an air curtain air supply interlayer, which is defined by the combination of the lower part of the inner cylinder 4, the smoke collecting hood 5 and the outer shell 6, including a vertical cylindrical interlayer part parallel to the Y axis and an oblique cone interlayer part at a certain angle to the Y axis. An air outlet is provided at the lower part of the oblique cone interlayer, and the air flow flows out from the air outlet to form a smoke collecting air curtain 9. The air outlet is in the shape of a rectangular slit or a wavy slit. The inner cylinder 4, the smoke collecting air curtain structure, and the smoke collecting hood 5 can move up and down together.

[0021] The air supply path of the smoke-collecting air curtain structure is as follows: the air supply mechanism 7 pressurizes and blows out the surrounding air, sends it into the air supply interlayer of the air curtain to continue to equalize the pressure in a small range, and finally blows it out from the air outlet to form Figure 2 The negative pressure area is reduced and the smoke is efficiently collected.

[0022] The path for the range hood to absorb oil smoke is as follows: after the oil smoke is generated from the stove, it is sucked into the inner tube 4 through the smoke collecting chamber 8, then enters the fixed pipe 2, and then is pressurized by the main fan 1 and discharged to the public flue.

[0023] like Figure 3 , 4 As shown, on one hand, the present invention provides an air supply mechanism 7 for a range hood, the range hood comprises an outer shell 6 and an inner cylinder 4 defining an oil fume passage, a smoke collecting chamber is formed between the outer shell 6 and the inner cylinder 4, and the air supply mechanism 7 comprises: a wind wheel 10, which is arranged in the smoke collecting chamber and is sleeved on the outer wall of the inner cylinder 4 through a bearing 13, and can rotate around the inner cylinder 4 to generate airflow in the smoke collecting chamber; a driving mechanism 11, which is connected to the wind wheel 10 and is configured to drive the wind wheel 10 to rotate.

[0024] The wind wheel 10 can be made of metal material through CNC cutting or casting, with a hollow circular structure in the middle. The outer ring 101 of the bearing 13 is embedded in the inner wall of the circular structure. The outer ring 101 is stationary relative to the wind wheel 10, and the inner ring 102 is sleeved on the outer wall of the inner tube 4 and is relatively stationary with the outer wall. When the wind wheel 10 receives a torsional force, the wind wheel 10 rotates relative to the inner tube 4. During the rotation, the wind wheel 10 can generate an airflow in one direction. The air supply through the wind wheel 10 can make the airflow pressure distribution in the smoke collection chamber balanced, which is conducive to forming a stable smoke collection air curtain. The rotation of the wind wheel 10 is driven by the driving mechanism 11, and the driving mechanism 11 and the wind wheel 10 can be in conventional forms such as belt drive, chain drive, and synchronous belt drive.

[0025] In some embodiments, the wind wheel 10 includes: an inner ring 102, which is sleeved on the outer wall of the bearing 13; an outer ring 101, which is arranged on the outer side of the inner ring 102 and is concentric with the inner ring 102; and a plurality of blades 103, which are evenly distributed between the inner ring 102 and the outer ring 101, and the two ends of each blade 103 are fixedly connected to the inner ring 102 and the outer ring 101 respectively. The inner ring 102 and the outer ring 101 of the wind wheel 10 are sleeved, and can be connected together by a plurality of blades 103 between the inner ring 102 and the outer ring 101, or a connecting piece can be arranged between the inner ring 102 and the outer ring 101. In order to ensure the connection strength between the inner ring 102 and the bearing 13, and to minimize the weight and energy consumption of the wind wheel 10, the wall thickness of the inner ring 102 is greater than the wall thickness of the outer ring 101. Under high speed conditions, the wind wheel 10 can rotate more stably, the blades 103 are not easily deformed, and the stability and structural strength of the air supply are improved. The wind wheel 10 can be driven by driving the outer ring 101, breaking the conventional way that the wind wheel 10 is driven by connecting the driving shaft, and the structure is more flexible.

[0026] In some embodiments, the outer wall of the outer ring 101 is a gear structure, and the driving mechanism 11 includes: a driving gear 111, which is meshed with the outer wall of the outer ring 101, and drives the wind wheel 10 to rotate when the driving gear 111 is controlled to rotate. The driving gear 111 can be directly meshed with the outer wall of the outer ring 101 or can be meshed with the outer wall of the outer ring 101 through a speed gear to meet the different speed requirements of the wind wheel 10. Optionally, the size of the driving gear 111 is smaller than the size of the outer ring 101, which not only saves the overall space, but also increases the torque transmitted to the wind wheel 10, preventing the prime mover from being damaged due to excessive driving torque during static starting.

[0027] In some embodiments, the driving mechanism 11 further includes: a motor 112 configured to drive the driving gear 111 to rotate. The output shaft of the motor 112 passes through the inner hole of the driving gear 111 and is connected by a key to achieve torque transmission between the motor 112 and the driving gear 111 to prevent slipping.

[0028] In some embodiments, the drive mechanism 11 is disposed in the smoke collecting chamber. The drive mechanism 11 is disposed in the smoke collecting chamber, which makes the appearance of the range hood more coordinated, and since the drive mechanism 11 is usually a rotating component, disposing it in the smoke collecting chamber prevents users from getting objects entangled in the drive mechanism 11 during use, thereby reducing safety hazards.

[0029] like Figure 5 As shown, another aspect of the present invention provides a range hood, comprising an outer shell 6 and an inner cylinder 4 defining an oil smoke passage, a smoke collecting chamber is formed between the outer shell 6 and the inner cylinder 4, and also comprises any one of the above-mentioned air supply mechanisms 7.

[0030] In some embodiments, an impeller 12 is provided in the oil fume channel, and the impeller 12 and the wind wheel 10 are located at the same height. In order to improve the effect of absorbing oil fume, it is necessary to set the impeller 12 between the main fan 1 and the smoke collecting chamber 8. The rotation of the impeller 12 can generate negative pressure below the impeller 12, forcing the oil fume in the smoke collecting chamber 8 to pass through the impeller 12 and enter the main fan 1, which plays a connecting role as a whole. Since the direction of the airflow generated by the wind wheel 10 is exactly opposite to the direction of the airflow generated by the impeller 12, the rotation direction of the wind wheel 10 is opposite to the rotation direction of the impeller 12. The impeller 12 and the wind wheel 10 are set at the same height. In this way, the vibrations generated by the rotation of the impeller 12 and the wind wheel 10 can offset each other partially, thereby greatly reducing noise and improving user experience.

[0031] In some embodiments, the range hood further includes a controller configured to control the rotation of the impeller 12 and the wind wheel 10; wherein the rotation direction of the wind wheel 10 is opposite to the rotation direction of the impeller 12. For example, when the driving mechanism 11 includes a motor 112, the controller may be a frequency converter, and the start / stop and speed of the motor 112 are controlled by the frequency converter. The separate control of the wind wheel 10 and the impeller 12 enables the user to independently select the start / stop and speed of the wind wheel 10 and the impeller 12 according to different working conditions, thereby meeting the different needs of the user and laying a foundation for the automatic control of the wind wheel 10 and the impeller 12.

[0032] In some embodiments, the air supply mechanism 7 is arranged at the upper part of the smoke collecting chamber. Because the smoke collecting chamber is arranged to form a negative pressure zone at the periphery and lower part of the smoke collecting chamber 8, the airflow needs to be blown out from top to bottom to surround the smoke collecting chamber 8. The opening of the air supply mechanism 7 is connected to the upper opening of the smoke collecting chamber so that the airflow generated by the air supply mechanism 7 can directly enter the smoke collecting chamber. Specifically, the connection between the air supply mechanism 7 and the smoke collecting chamber can be in the form of flange connection or welding to ensure both the strength of the connection and the airtightness of the connection.

[0033] In some embodiments, an air outlet is provided at the lower part of the smoke collecting chamber. The air outlet can be a directly open slit or a plurality of openings on an overall closed structure. When the air outlet is a directly open slit, the wind force is small, but the air outlet is more uniform in each part; when the air outlet is a plurality of openings, the wind force is large.

[0034] In some embodiments, Figure 6 , 7 As shown, the shell 6 of the range hood includes: a protrusion 61, which extends outward along the surface of the shell 6 and is hollow inside, connected to the smoke collecting chamber, and is configured to buffer and slow down the airflow in the smoke collecting chamber to make the air pressure uniform.

[0035] The smoke collecting chamber can be a gap between two structures formed by the same or similar sheet metal sleeves, and the sheet metal part located on the inner side is a smoke collecting hood 5, which is slightly smaller than the size of the outer shell 6 located on the outer side. The outer shell 6 and the smoke collecting hood 5 can be skirt-shaped as a whole, with the upper part being the air inlet of the smoke collecting chamber connected to the air supply mechanism 7, and the lower part being the air outlet of the smoke collecting chamber. The airflow is blown out from the air outlet of the smoke collecting chamber, so that the air outlet of the smoke collecting chamber forms a smoke collecting air curtain 9 at the periphery of the smoke collecting chamber 8, so as to form a negative pressure zone at the smoke inlet of the smoke collecting chamber 8, so as to achieve effective smoking. The raised portion 61 can be formed in the form of sheet metal stamping to form a space connected to the smoke collecting chamber. When the airflow flows through this space, the volume suddenly increases, the pressure decreases, and the flow rate slows down, making the air pressure more uniform. The airflow in the smoke collecting chamber is distributed 360° and flows downward. The circumferential wind speed may become different during the flow. When the airflow passes through the raised portion 61, the air with different circumferential wind speeds will be buffered and decelerated in this relatively large raised portion 61, converting the previous uneven dynamic pressure into uniform static pressure, and then sent out of the smoke collecting chamber to achieve a pressure equalization effect.

[0036] In some embodiments, the protrusion 61 can also be arranged on the outer sheet metal, distributed along the outer periphery of the outer sheet metal of the housing 6, for example, forming a ring. When arranged on the housing 6, the protrusion 61 will not erode the space of the smoke collecting chamber 8, preventing the oil smoke from being blocked on the travel route and reducing the efficiency of the range hood.

[0037] The cross section of the raised portion 61 may be in an arc shape, an ellipse shape or other shape with smooth transition lines, so as to reduce the resistance of the airflow in this area.

[0038] In some embodiments, the smoke collecting chamber includes: an inclined air duct, which is arranged between the inclined portion 62 of the outer shell 6 and the smoke collecting hood 5; wherein the air outlet is arranged in the inclined air duct, and the protrusion 61 is arranged in the inclined portion 62 of the outer shell 6. In order to minimize the overall size of the range hood and increase the size of the smoke collecting area, the outer shell 6 and the smoke collecting hood 5 are arranged in a cone shape, and the size gradually increases from top to bottom, so that the smoke collecting area can be increased relative to the size of the outer shell 6. Since the outer shell 6 and the smoke collecting hood 5 are conical, the smoke collecting chamber formed by them is also inclined, with an upper air inlet, a lower air outlet and a middle inclined air duct. The protrusion 61 can be arranged in the middle area of ​​the outer shell 6, and the cavity formed by the protrusion 61 is connected to the inclined air duct.

[0039] In some embodiments, the angle α between the smoke hood 5 and the vertical direction is greater than the angle β between the inclined portion 62 and the vertical direction. For example, 85°>α>β>45°. At this time, the smoke collecting chamber is a structure in which the volume gradually decreases from the air inlet to the air outlet of the smoke collecting chamber, increasing the pressure of the air flow out of the air outlet to form a stable smoke collecting air curtain. Optionally, the width of the air outlet is 2mm to 10mm. In this way, when the air flow flows out of the air outlet, it has an appropriate pressure to form a relatively stable smoke collecting air curtain.

[0040] In some embodiments, the position of the protrusion 61 satisfies the following relationship: d1=k1*d2, wherein d1 represents the distance from the protrusion 61 to the junction of the inclined portion 62 and the vertical portion 63 of the housing 6, d2 represents the distance from the air outlet to the junction of the inclined portion 62 and the vertical portion 63 of the housing 6, k1 is a first weighting coefficient, k1>0. Optionally, 0.5≤k1≤1. In order to achieve a better pressure stabilization effect on the airflow, the setting position of the protrusion 61 is set to be positively correlated with the extension size of the housing 6. When the extension size of the housing 6 along the inclined direction is large, the setting position of the protrusion 61 is correspondingly extended downward.

[0041] In some embodiments, the range hood further comprises: an inner cylinder 4 defining an oil fume passage, connected to the upper portion of the fume collecting hood 5, and arranged corresponding to the vertical portion 63 of the outer shell 6. The inner cylinder 4 is seamlessly connected to the upper portion of the fume collecting hood 5, and the vertical portion 63 of the outer shell 6 is seamlessly connected to the upper portion of the outer shell 6. The size of the vertical portion 63 of the outer shell 6 is slightly larger than the size of the inner cylinder 4, so a cavity is formed between the vertical portion 63 of the outer shell 6 and the inner cylinder 4, and the cavity is connected to the inclined portion 62. At this time, the air supply mechanism 7 is connected to the upper portion of this cavity, and the airflow passes through this cavity and flows into the inclined portion 62 of the smoke collecting cavity.

[0042] In some embodiments, the depth of the protrusion 61 satisfies the following relationship: h2=k2*h1, wherein h2 represents the maximum depth of the protrusion 61, h1 represents the distance between the vertical portion 63 of the outer shell 6 and the inner cylinder 4, k2 is the second weighting coefficient, and k2>0. Optionally, 0.5≤k2≤1. In order to ensure that the cavity formed by the protrusion 61 can achieve a better airflow stabilization effect, the depth of the protrusion 61 and the distance between the vertical portion 63 and the inner cylinder 4 are set to be in a positive correlation. When the distance between the vertical portion 63 and the inner cylinder 4 is large, it means that the airflow is large, and the size of the protrusion 61 needs to be increased to ensure the airflow stabilization effect.

[0043] In some embodiments, the length of the smoke hood 5 is greater than or equal to the length of the inclined portion 62. When the size of the inclined portion 62 is greater than the size of the smoke hood 5, the airflow flows out from the air outlet and is only guided by the inclined portion 62 on one side, while the direction of the smoke hood 5 on the other side is not constrained, so the airflow easily flows into the smoke collecting chamber 8, resulting in no smoke collection effect. When the length of the smoke hood 5 is greater than or equal to the length of the inclined portion 62, the situation is just the opposite. Under the guidance of the smoke hood 5, the airflow flows out in the direction of the smoke hood 5 or away from the smoke collecting chamber 8.

[0044] In some embodiments, the length of the inclined portion 62 satisfies the following relationship: L2=k3*L1, wherein L2 represents the length of the inclined portion 62, L1 represents the length of the smoke hood 5, k3 is the third weighting coefficient, and k3>0. Optionally, 0.5≤k3≤1. The size of the inclined portion 62 is positively correlated with the size of the smoke hood 5, and the size of the smoke hood 5 increases with the increase in the length of the inclined portion 62, thereby ensuring the guiding effect on the airflow.

[0045] The terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. in this document indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this document and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of this document, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, it can also be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0046] As used herein, the term "plurality" means two or more than two, unless otherwise specified.

Claims

1. A range hood, comprising a housing and a smoke collecting chamber, characterized in that: The housing comprises: A raised portion, which extends outwardly along the surface of the shell and is hollow inside, is communicated with the smoke collecting chamber and is configured to buffer and decelerate the airflow in the smoke collecting chamber to make the air pressure uniform; The range hood further comprises: an air supply mechanism, a driving mechanism and an inner cylinder defining an oil smoke passage, wherein the air supply mechanism comprises: a wind wheel, which is arranged in the smoke collecting chamber and can rotate around the inner cylinder to generate airflow in the smoke collecting chamber; the driving mechanism is connected to the wind wheel and is configured to drive the wind wheel to rotate; an impeller is arranged in the oil smoke passage, and the impeller and the wind wheel are located at the same height; The position of the protrusion satisfies the following relationship: d1=k1*d2, wherein d1 represents the distance from the protrusion to the junction of the inclined portion of the shell and the vertical portion of the shell, d2 represents the distance from the air outlet to the junction of the inclined portion of the shell and the vertical portion of the shell, k1 is the first weighting coefficient, 0.5≤k1≤1; The depth of the protrusion satisfies the following relationship: h2=k2*h1, wherein h2 represents the maximum depth of the protrusion, h1 represents the distance between the vertical portion of the outer shell and the inner cylinder, k2 is the second weighting coefficient, and 0.5≤k2≤1.

2. The range hood according to claim 1, characterized in that: The protrusions are distributed along the outer circumference of the housing.

3. The range hood according to claim 1, characterized in that: It also includes a smoke collecting hood, and the smoke collecting chamber includes: An inclined air duct is arranged between the inclined portion of the housing and the smoke collecting hood; Wherein, the air outlet is arranged on the inclined air duct, and the protrusion is arranged on the inclined portion of the shell.

4. The range hood according to claim 3, characterized in that: The angle α between the smoke collecting hood and the vertical direction is greater than the angle β between the inclined portion and the vertical direction.

5. The range hood according to claim 3, characterized in that: Also includes: The inner cylinder defining the oil fume passage is connected to the upper portion of the fume collecting hood and is arranged corresponding to the vertical portion of the outer shell.

6. The range hood according to claim 5, characterized in that: A vertical air duct is provided between the inner cylinder and the vertical portion, and the vertical air duct is communicated with the inclined air duct.

7. The range hood according to any one of claims 1 to 6, characterized in that: The length of the smoke collecting hood is greater than or equal to the length of the inclined portion.

8. The range hood according to claim 7, characterized in that: The length of the inclined portion satisfies the following relationship: L2=k3*L1, Wherein, L2 represents the length of the inclined portion, L1 represents the length of the smoke hood, k3 is the third weighting coefficient, and k3>0.

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