Range hood

Abstract

The utility model discloses a range hood which comprises a shell and a fan assembly located in the shell, an upward second air inlet is formed in the top end of the shell and connected with a second air inlet pipe, and the second air inlet pipe is provided with an air inlet and an air outlet. An air outlet of the second air inlet pipe extends into the inner side of the end face of the air inlet of the fan assembly. According to the range hood, the second air inlet pipe which is directly communicated with the second air inlet and extends into the air inlet of the fan assembly is arranged at the second air inlet, so that oil fume above a kitchen can be sucked into the range hood, is directly conveyed to the fan assembly and then is discharged, and mutual influence between the oil fume sucked from the second air inlet and airflow in the range hood is reduced. And meanwhile, the airflow of the second air outlet pipe can drive the airflow near the air outlet of the second air outlet pipe to form an injection effect, so that the airflow flow of the air inlet of the fan assembly is increased, and the cleaning effect of the range hood for capturing oil fume above a kitchen is improved.

Description

Technical Field

[0001] The utility model relates to a range hood. Background Art

[0002] Range hoods are used to exhaust cooking fume particles and gaseous organic matter to the outside. Therefore, the range hood's smoke capture port is typically positioned directly opposite the pot to maximize the capture of cooking fumes. However, the gaseous organic matter in cooking fumes has a low density and, in addition to following the airflow, undergoes strong Brownian motion, a highly random process. Consequently, the range hood can only capture a portion of the gaseous organic matter, while the remaining portion, driven by Brownian motion, diffuses throughout the kitchen. Furthermore, since some gaseous organic matter is less dense than air, it gradually rises to the upper part of the kitchen. Since the range hood is located below the kitchen, and the door or window serving as the air intake is also located in the lower middle part of the kitchen, the escaping gaseous organic matter remains above the kitchen, making it difficult to capture it again.

[0003] At present, the general method to solve the problem of capturing oil smoke from above is to open an opening at the top of the range hood to absorb the oil smoke from above. However, the oil smoke sucked into the upper opening will interfere with the airflow in the range hood, resulting in the possibility of backflow of the oil smoke absorbed by the upper opening, making the oil smoke absorption effect unsatisfactory. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide a range hood to overcome the defect in the prior art that the oil smoke sucked into the upper opening of the range hood interferes with the airflow inside the range hood, resulting in an unsatisfactory effect of adsorbing the oil smoke.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] The utility model provides a range hood, which includes a shell and a fan assembly located in the shell, the top of the shell is provided with a second upward air inlet, the second air inlet is connected to a second air inlet pipe, the second air inlet pipe has an air inlet and an air outlet, and the air outlet of the second air inlet pipe extends into the inner side of the air inlet end face of the fan assembly.

[0007] In this solution, by providing a second air inlet duct at the second air inlet at the top of the range hood housing, directly connected to and extending into the air inlet of the fan assembly, it is possible to ensure that oil fumes from above the kitchen are drawn into the range hood and then directly transported to the fan assembly for exhaust. This reduces the interaction between oil fumes drawn in through the second air inlet and the airflow within the range hood. Furthermore, because the outlet of the second air inlet duct extends into the air inlet of the fan assembly, the air inlet of the fan assembly is divided into two sections: an external circulation area and an internal circulation area. Because the air inlet velocity in the external circulation area exhibits a gradient distribution, typically exhibiting higher velocities near the outer side and lower velocities near the outer wall of the second air inlet duct outlet, the airflow in the internal circulation area drives the airflow in the external circulation area near the outer wall of the second air inlet duct outlet, acting as a traction force and achieving the purpose of entrainment. This increases the airflow rate at the fan assembly inlet, thereby improving the range hood's cleaning effectiveness in capturing oil fumes from above the kitchen.

[0008] Preferably, the axis of the air outlet of the second air inlet pipe is located above the axis of the air inlet of the fan assembly.

[0009] In this solution, since the air flow velocity below the air inlet of the fan assembly is higher than the air flow velocity above it, the traction effect of the internal circulation area can be further improved by positioning the axis of the air outlet of the second air inlet pipe above the axis of the air inlet of the fan assembly.

[0010] Preferably, the outlet of the second air inlet pipe extends into the inner side of the air inlet end surface of the fan assembly by a distance of not less than 20 mm.

[0011] In this solution, the outlet of the second air inlet duct extends into the inner side of the air inlet end face of the fan assembly by no less than 20 mm, which can further ensure that the outlet of the second air inlet duct is in the negative pressure zone, while maximizing the outlet space of the second air inlet duct, which is beneficial to reducing the outlet resistance of the second air inlet duct and increasing the air volume of the second air inlet duct, thereby improving the cleaning effect of the range hood in capturing oil fumes above the kitchen.

[0012] Preferably, the axis of the air outlet of the second air inlet pipe is parallel to the axis of the air inlet of the fan assembly.

[0013] In this solution, by arranging the axis of the air outlet of the second air inlet pipe parallel to the axis of the air inlet of the fan assembly, the airflow can be turned, and the downward-flowing airflow is changed into a horizontal flow, so that the airflow out of the second air inlet pipe has the same flow direction as the airflow outside the second air inlet pipe, thereby preventing the two airflows from strongly converging to generate vortices and vortex noise.

[0014] Preferably, a first air inlet is provided on the air inlet surface of the housing facing the cooker, and the first air inlet is connected to the air inlet of the fan assembly.

[0015] In this solution, the first air inlet is used to quickly absorb cooking fumes near the stove, improving the user experience. The first air inlet can absorb a large amount of cooking fumes, while some of the escaping fumes can also be absorbed through the second air inlet, thereby enhancing the range hood's ability to absorb fumes. Furthermore, by providing a first air inlet facing the stove and a second air inlet located at the top of the housing, the same fan system can be used to capture both cooking fumes and gaseous organic matter escaping into the kitchen. This avoids the need for a separate fan system, reducing energy consumption, saving space, and reducing noise generated by the fan's operation.

[0016] Preferably, the cross-section of at least part of the second air inlet pipe gradually decreases from the direction of oil fume circulation, and the air outlet of the second air inlet pipe is arranged at the end of the second air inlet pipe with the smaller cross-section.

[0017] In this solution, by gradually reducing the cross-section of at least part of the second air inlet pipe from the direction of oil fume circulation, the purpose of converging airflow and increasing airflow velocity can be achieved, and the air outlet of the second air inlet pipe is set at the end of the second air inlet pipe with a smaller cross-section, so that the airflow flowing out of the air outlet of the second air inlet pipe can be kept at a high speed, further improving its elicitation effect.

[0018] Preferably, the second air inlet pipe includes an air inlet riser and an air outlet duct, the axis of the air outlet duct is set at an angle to the axis of the air inlet riser, and the first end of the air outlet duct is connected to the air inlet riser and is internally communicated with the air inlet riser.

[0019] In this solution, by configuring the second air inlet duct to include an air inlet riser and an air outlet duct, with the axis of the air outlet duct positioned at an angle to the axis of the air inlet riser, the airflow direction of the second air inlet duct can be changed, directed toward the air inlet of the fan assembly. Furthermore, this structural form allows the air inlet riser and air outlet duct to draw overhead fumes into the fan assembly within the housing, allowing the range hood to absorb overhead fumes.

[0020] Preferably, the air outlet duct is provided with a plurality of inserts arranged at intervals along the circumference of the first end, and the inserts are used to bend in a direction close to the air inlet vertical pipe to connect the air outlet duct to the air inlet vertical pipe.

[0021] In this solution, a plurality of spaced-apart inserts are provided along the circumference of the first end of the air outlet duct, and the air outlet duct is hooked on the air inlet vertical pipe by bending the inserts. This type of fixation with inserts has a simple structure and saves space.

[0022] Preferably, the air inlet riser comprises a first vertical pipe and a second vertical pipe, the housing comprises a top plate, the first vertical pipe and the second vertical pipe are connected to two opposite surfaces of the top plate, and the second air inlet is provided on the top plate of the housing.

[0023] In this solution, the air inlet riser is divided into a first vertical pipe and a second vertical pipe, which are respectively connected to the top plate of the outer shell, thereby facilitating the installation of the air inlet riser and the top plate of the outer shell.

[0024] Preferably, the air inlet of the second air inlet pipe is connected to a grille.

[0025] In this solution, by connecting a grille to the air inlet of the second air inlet duct, foreign matter can be prevented from entering the interior of the range hood through the second air inlet.

[0026] The positive progress effect of this utility model is:

[0027] The range hood of the present invention, by providing a second air inlet duct directly connected to and extending into the air inlet of the fan assembly at the second air inlet at the top of the range hood housing, ensures that oil fumes from above the kitchen are drawn into the range hood and then directly transported to the fan for exhaust, thereby reducing the interaction between the oil fumes drawn in through the second air inlet and the airflow within the range hood. Furthermore, because the outlet of the second air inlet duct extends into the air inlet of the fan assembly, the air inlet of the fan assembly is divided into two parts, namely, an external circulation area and an internal circulation area. Since the air inlet velocity in the external circulation area is distributed in a gradient, typically exhibiting a higher velocity near the outside and a lower velocity near the outer wall of the second air inlet duct outlet, the airflow in the internal circulation area will drive the airflow in the external circulation area near the outer wall of the second air inlet duct outlet, acting as a traction force to achieve the purpose of entrainment, thereby increasing the airflow rate at the fan assembly inlet and improving the range hood's cleaning effect in capturing oil fumes from above the kitchen. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a side sectional view of the range hood according to an embodiment of the present invention.

[0029] Figure 2 A three-dimensional cross-sectional view of a range hood according to an embodiment of the present invention

[0030] Figure 3 Schematic diagram of the assembly of the fan assembly and the second air inlet pipe of the range hood according to the embodiment of the utility model

[0031] Figure 4 A three-dimensional view of the second air inlet duct of the range hood according to an embodiment of the present invention

[0032] Figure 5 This is an exploded view of the second air inlet duct of the range hood according to the embodiment of the present invention.

[0033] Figure 6 A three-dimensional view of the first vertical pipe of the range hood according to an embodiment of the present invention

[0034] Figure 7 This is a side sectional view of the range hood according to an embodiment of the present invention.

[0035] Description of reference numerals:

[0036] Range hood 100

[0037] Shell 1

[0038] Top plate 11

[0039] Fan assembly 2

[0040] The air inlet end face 21 of the fan assembly

[0041] Motor 22

[0042] Volute 23

[0043] Turbine 24

[0044] Second air inlet 3

[0045] Second air inlet pipe 4

[0046] Air inlet riser 41

[0047] First vertical pipe 411

[0048] Second vertical pipe 412

[0049] Pipeline body 4121

[0050] Pipe cover 4122

[0051] Air outlet duct 42

[0052] Air inlet side facing the stove 5

[0053] First air inlet 51

[0054] Insert 6

[0055] Grille 7

[0056] Tighten the nut 8

[0057] Axial flow fan blade 9 DETAILED DESCRIPTION

[0058] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0059] This embodiment provides a range hood 100, such as Figure 1and Figure 2 As shown, it includes a housing 1 and a fan assembly 2 located in the housing 1, and the fan assembly 2 includes a motor 22, a volute 23 and a turbine 24. The motor 22 is connected to the turbine 24 through a shaft, so that the rotation of the motor 22 is transmitted to the turbine 24 through the shaft, driving the turbine 24 to rotate. The turbine 24 is installed inside the volute 23. The air inlet surface 5 of the housing 1 facing the stove is provided with a first air inlet 51, and the first air inlet 51 is connected to the air inlet of the fan assembly 2. The housing 1 includes a top plate 11, and the top plate 11 is provided with an upward second air inlet 3. The second air inlet 3 is connected to the second air inlet pipe 4. The second air inlet pipe 4 has an air inlet and an air outlet. The air outlet of the second air inlet pipe 4 extends into the inner side of the air inlet end surface 21 of the fan assembly.

[0060] Therefore, when turbine 24 rotates at high speed, the area covered by turbine 24 is in a low-pressure zone, causing airflow from other areas to flow toward the area covered by turbine 24. Due to the viscosity and incompressibility of the fluid, this drives the airflow at the second air inlet 3 forward. This causes the static pressure of the airflow at the outlet of the second air inlet duct 4 to be much lower than the pressure at the inlet of the second air inlet duct 4. Due to this pressure difference, airflow flows from the inlet of the second air inlet duct 4 to the outlet of the second air inlet duct 4, thereby driving airflow above the kitchen space and capturing gaseous organic matter escaping above the kitchen. By providing a second air inlet duct 4 at the top of the housing 1 that is directly connected to and extends into the air inlet of the fan assembly 2, it ensures that oil fumes from above the kitchen are drawn into the range hood 100 and then directly transported to the fan assembly 2 for exhaust. This reduces the interaction between oil fumes drawn in through the second air inlet 3 and those drawn in through the first air inlet 51. At the same time, because the outlet of the second air inlet duct 4 extends into the air inlet of the fan assembly 2, the air inlet of the fan assembly 2 is divided into two parts: an external circulation area and an internal circulation area. The external circulation area is the circulation area where oil fumes are drawn in from the first air inlet 51, and the internal circulation area is the circulation area where oil fumes are drawn in from the second air inlet 3. Because the air inlet velocity in the external circulation area is distributed in a gradient, typically with higher velocities near the outside and lower velocities near the outer wall of the outlet of the second air inlet duct 4, the airflow in the internal circulation area drives the airflow in the external circulation area near the outer wall of the outlet of the second air inlet duct 4, acting as a traction force, achieving the purpose of entrainment and increasing the airflow rate at the air inlet of the fan assembly 2. This not only improves the efficiency of the range hood 100 in capturing oil fumes above the kitchen, but also enhances the cleaning effect of absorbing oil fumes facing the stove.

[0061] In this embodiment, the air inlet surface 5 of the housing 1 facing the cooktop is provided with a first air inlet 51, which is connected to the air inlet of the fan assembly 2. Specifically, the first air inlet 51 allows for rapid absorption of cooking fumes near the cooktop, enhancing the user experience. The first air inlet 51 can absorb a large amount of cooking fumes, while some of the escaping fumes can also be absorbed through the second air inlet 3, thereby enhancing the range hood 100's ability to absorb cooking fumes. Furthermore, the first air inlet 51 and the second air inlet 3 located at the top of the housing 1 can utilize the same fan system to simultaneously capture cooking fumes generated by the pot and gaseous organic matter escaping into the kitchen. This avoids the need for a separate fan system, reducing energy consumption, conserving space, and reducing noise generated by the fan operation.

[0062] Specifically, the axis of the air outlet of the second air inlet duct 4 is coaxial with the air inlet of the fan assembly 2, and may be located above or below the axis of the air inlet of the fan assembly 2. Preferably, the axis of the air outlet of the second air inlet duct 4 is located directly above the axis of the air inlet of the fan assembly 2, and the air outlet of the second air inlet duct 4 may or may not be aligned with the upper outer edge of the air inlet of the fan assembly 2.

[0063] Therefore, since the first air inlet 51 is closer to the bottom of the air inlet of the fan assembly 2, the air flow velocity below the air inlet of the fan assembly 2 is higher than the air flow velocity above. By positioning the axis of the air outlet of the second air inlet pipe 4 above the axis of the air inlet of the fan assembly 2, the traction effect of the internal circulation area can be further improved.

[0064] Specifically, the outlet of the second air inlet pipe 4 extends into the inner side of the air inlet end surface 21 of the fan assembly by a distance of not less than 20 mm.

[0065] As a result, the outlet of the second air inlet duct 4 extends into the inner side of the air inlet end face 21 of the fan assembly by at least 20 mm. This further ensures that the outlet of the second air inlet duct 4 is in a negative pressure zone while maximizing the outlet space of the second air inlet duct 4. This helps reduce outlet resistance of the second air inlet duct 4 and increases the air volume of the second air inlet duct 4, thereby improving the range hood 100's effectiveness in capturing kitchen fumes and cleaning them. In other embodiments, the distance that the outlet of the second air inlet duct 4 extends into the inner side of the air inlet end face 21 of the fan assembly can be adjusted according to actual needs and is not limited here.

[0066] Specifically, if Figure 3-6As shown, the second air inlet duct 4 includes an air inlet riser 41 and an air outlet duct 42. The air inlet riser 41 includes a first vertical duct 411 and a second vertical duct 412. The first vertical duct 411 and the second vertical duct 412 are connected to opposite surfaces of the top plate 11, and are located above and below the top plate 11, respectively. The connection end of the first vertical duct 411 to the top plate 11 has a fitting portion that extends outward from the outer surface of the first vertical duct 411 in a direction perpendicular to the pipeline passage of the first vertical duct 411. The connection end of the second vertical duct 412 to the top plate 11 has a fitting portion that extends outward from the outer surface of the second vertical duct 412 in a direction perpendicular to the pipeline passage of the second vertical duct 412. The fitting portions of the first and second vertical ducts 411, 412 are fixed to the top plate 11 using screws, thereby securing the second air inlet duct 4. In other embodiments, those skilled in the art may also select other suitable connection methods.

[0067] Therefore, by dividing the air inlet vertical pipe 41 into a first vertical pipe 411 and a second vertical pipe 412 and connecting them to the top plate 11 of the shell 1 respectively, the air inlet vertical pipe 41 can be easily installed.

[0068] Specifically, if Figure 3 As shown, the cross section of at least part of the second air inlet pipe 4 gradually decreases in the direction of oil smoke circulation, and the air outlet of the second air inlet pipe 4 is arranged at the end with the smaller cross section of the second air inlet pipe 4. Preferably, the second vertical pipe 412 of the second air inlet pipe 4 gradually decreases in the direction of oil smoke circulation.

[0069] Therefore, by gradually reducing the cross-section of at least part of the second air inlet pipe 4 from the direction of oil fume circulation, the purpose of converging the airflow and increasing the airflow velocity can be achieved, and the air outlet of the second air inlet pipe 4 is set at the end with the smaller cross-section of the second air inlet pipe 4, so that the outflowing airflow can be kept at a high speed, further improving its elicitation effect.

[0070] Specifically, the axis of the air outlet duct 42 is set at an angle to the axis of the air inlet vertical pipe 41, and the first end of the air outlet duct 42 is connected to the air inlet vertical pipe 41 and is internally connected. With the above-mentioned structural form, the oil smoke at the top is sucked into the fan assembly 2 inside the shell 1 through the air inlet vertical pipe 41 and the air outlet duct 42, so that the range hood 100 can absorb the oil smoke at the top. Preferably, the air outlet duct 42 is vertically fixed to the second vertical pipe 412, so that the axis of the air outlet duct 42 is parallel to the axis of the air inlet of the fan assembly 2. In other embodiments, the angle between the axis of the air outlet duct 42 and the axis of the air inlet vertical pipe 41 can be adjusted according to actual needs and is not limited here.

[0071] Therefore, by setting the axis of the air outlet duct 42 parallel to the axis of the air inlet of the fan assembly 2, the airflow can be turned, and the downward-flowing airflow can be changed into a horizontal flow, so that the airflow flowing out of the second air inlet pipe 4 is in the same direction as the airflow outside the second air inlet pipe 4, preventing the two airflows from strongly converging to generate vortices and vortex noise.

[0072] Specifically, the air outlet duct 42 is a symmetrical structure, and may also be any other shape deemed appropriate by those skilled in the art. Preferably, the air outlet duct 42 is a circular structure, which is more conducive to uniform distribution of airflow in the first air inlet channel.

[0073] Therefore, by setting the air outlet duct 42 to a structure with structural symmetry, it is more conducive to uniform distribution of airflow in the first air inlet channel, reducing local energy accumulation and corresponding noise generation caused by structural asymmetry.

[0074] Specifically, if Figure 5 As shown, the second vertical duct 412 includes a duct body 4121 and a duct cover 4122. A plurality of spaced-apart inserts 6 are circumferentially disposed along the connecting end between the duct body 4121 and the duct cover 4122. The inserts 6 are configured to bend toward the duct cover 4122 to connect the duct cover 4122 to the duct body 4121. The outlet duct 42 is also circumferentially disposed with a plurality of spaced-apart inserts 6 along the first end. The inserts 6 are configured to bend toward the air inlet riser 41 to connect the outlet duct 42 to the air inlet riser 41. In other embodiments, those skilled in the art may also select other suitable connection methods.

[0075] Thus, by providing a plurality of spaced inserts 6 along the circumference of the first end of the outlet duct 42, the inserts 6 are bent to allow the outlet duct 42 to be hooked onto the air inlet riser 41. The second vertical duct 412 consists of a duct body 4121 and a duct cover 4122, both of which are also fixed with inserts 6, which simplifies the structure and saves space.

[0076] Specifically, if Figure 6 As shown, the air inlet of the second air inlet pipe 4 is connected to a grille 7. The grille 7 can be integrated with the first vertical pipe of the second air inlet pipe 4. In other embodiments, those skilled in the art can also choose other suitable ways to prevent foreign matter from entering.

[0077] Thus, by connecting the grille 7 to the air inlet of the second air inlet duct 4 , foreign matter can be prevented from entering the interior of the range hood 100 through the second air inlet 3 .

[0078] Specifically, if Figure 7As shown, a tightening nut 8 is provided on the shaft of the motor 22 and an axial flow fan blade 9 is provided on its outer side. When the motor 22 drives the turbine 24 of the range hood 100 to rotate, the tightening nut 8 is also driven to rotate, thereby driving the axial flow fan blade 9 to rotate.

[0079] Therefore, the rotation of the axial flow fan blades 9 will form a large negative pressure, which is beneficial to increase the air volume of the second air inlet pipe 4 and strengthen the capture of escaping gaseous organic matter; at the same time, it helps to strengthen the injection of airflow in the external circulation area, so that the airflow in the external circulation area is more evenly distributed at the air inlet of the fan assembly 2, which helps to enhance stability and reduce noise.

[0080] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of protection of the present invention.

Claims

1. A range hood comprising a housing and a fan assembly located within the housing, characterized in that: A second upward air inlet is provided at the top of the shell, and the second air inlet is connected to a second air inlet pipe. The second air inlet pipe has an air inlet and an air outlet, and the air outlet of the second air inlet pipe extends into the inner side of the air inlet end face of the fan assembly.

2. The range hood according to claim 1, wherein: The axis of the air outlet of the second air inlet pipe is located above the axis of the air inlet of the fan assembly.

3. The range hood according to claim 1, wherein: The outlet of the second air inlet pipe extends into the inner side of the air inlet end surface of the fan assembly by no less than 20 mm.

4. The range hood according to claim 1, wherein: The axis of the air outlet of the second air inlet pipe is parallel to the axis of the air inlet of the fan assembly.

5. The range hood according to claim 1, wherein: A first air inlet is provided on the air inlet surface of the housing facing the cooker, and the first air inlet is connected to the air inlet of the fan assembly.

6. The range hood according to claim 1, wherein: The cross section of at least part of the second air inlet pipe gradually decreases in the direction of oil smoke circulation, and the air outlet of the second air inlet pipe is arranged at the end of the second air inlet pipe with the smaller cross section.

7. The range hood according to claim 1, wherein: The second air inlet pipe includes an air inlet riser and an air outlet duct. The axis of the air outlet duct is arranged at an angle to the axis of the air inlet riser. The first end of the air outlet duct is connected to the air inlet riser and is internally communicated with the air inlet riser.

8. The range hood according to claim 7, wherein: The air outlet duct is provided with a plurality of inserts arranged at intervals along the circumference of the first end, and the inserts are used to bend in a direction close to the air inlet vertical pipe to connect the air outlet duct to the air inlet vertical pipe.

9. The range hood according to claim 7, wherein: The air inlet riser includes a first vertical pipe and a second vertical pipe, the shell includes a top plate, the first vertical pipe and the second vertical pipe are connected to two opposite surfaces of the top plate, and the second air inlet is arranged on the top plate of the shell.

10. The range hood according to claim 1, wherein: The air inlet of the second air inlet pipe is connected to a grille.

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