Fan system and underneath type range hood comprising same

Abstract

The invention discloses a fan system and an underneath type range hood comprising the same, the fan system is obliquely arranged in a box body of the range hood, the fan system comprises a volute, the volute comprises a first bending part, the first bending part is arranged on a front cover and a rear cover of the volute and deviates from an outlet of the volute, and the second bending part is arranged on the front cover and the rear cover of the volute. The first bending part is obliquely arranged from a front cover and a rear cover of the volute to a cavity of the volute; the second bent part is arranged on the front cover of the volute and corresponds to the air inlet of the box body, the second bent part is arranged away from the outlet of the volute, and the second bent part is obliquely arranged from the front cover of the volute to the cavity of the volute; the first bending part and the second bending part are connected end to end, the first bending part is located between the second bending part and an outlet of the volute, and the bottom, deviating from the outlet of the volute, of a front cover of the volute is parallel to the bottom, deviating from the outlet of the volute, of the box body.

Description

Technical Field

[0001] The present invention relates in particular to a fan system and a down-mounted range hood including the fan system. Background Technology

[0002] Downdraft range hoods typically consist of a hood housing, a fan system, and an oil drain box. The housing is designed with considerations for user operating space, smoke extraction efficiency, and aesthetics, often featuring an inverted right-angled triangle structure that is wider at the top and narrower at the bottom. The fan system is placed at an angle within the housing, with its front and rear plates forming an angle with the housing panel. Typically, the front and rear covers of the volute are beveled to match the fan system to the housing, allowing for installation within the inverted right-angled triangle space. While this bevel design allows for a proper fit, the tilted fan system results in a height component on the front and rear covers. The greater the tilt angle, the higher this component becomes, meaning the bottom of the front cover is lower than the bottom of the rear cover. This forces some airflow within the volute to pass under the lower front cover, lengthening the flow path and increasing the risk of airflow separation. This limits the aerodynamic performance of the fan system and fails to meet users' demands for high-performance smoke extraction. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the existing bottom-mounted range hood, such as the inclined setting of the fan system, the large difference in height between the front and rear covers, and the easy flow separation of airflow in the internal cavity of the fan system, resulting in poor aerodynamic performance. The present invention provides a fan system and a bottom-mounted range hood including the fan system.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A fan system is provided, wherein the fan system is inclinedly disposed within the housing of a range hood, the fan system including a volute, the volute comprising:

[0006] The first bending portion is disposed on the front cover and the rear cover of the volute and is disposed away from the outlet of the volute. The first bending portion is inclined from the front cover and the rear cover of the volute toward the cavity of the volute.

[0007] The second bend is disposed on the front cover of the volute and corresponds to the air inlet of the housing. The second bend is disposed away from the outlet of the volute and is inclined from the front cover of the volute toward the cavity of the volute. The first bend and the second bend are connected end to end. The first bend is located between the second bend and the outlet of the volute. The bottom of the front cover of the volute away from the outlet of the volute is parallel to the bottom of the housing away from the outlet of the volute.

[0008] In this design, a first bend is incorporated to reduce the size of the bottom region of the volute casing along its width, allowing it to fit snugly into the narrowed bottom of the housing. Furthermore, with the volute tilted within the housing, there is a height difference between the front and rear covers. A second bend, which complements the first bend and connects sequentially, further reduces the size of the front cover bottom along the height of the housing, making the bottom of the volute casing parallel to the bottom of the housing. This eliminates the height difference between the front and rear covers at the bottom of the volute casing. Thus, without altering the fundamental expansion of the volute's flow channel, the second bend provides radial guidance for the flow, conforming to fluid expansion principles and minimizing its impact on the fluid.

[0009] Furthermore, based on the first and second bends, the height difference at the bottom of the volute is eliminated, allowing for a further reduction in the overall height of the volute along the height of the housing. Compared to a volute of the same height, this results in better aerodynamic performance and suitability for smaller housings. Alternatively, with the internal space of the housing unchanged, the reduction in the bottom dimension of the volute allows for a further increase in the overall volume of the volute. Specifically, the volute dimension can be increased along the height of the housing, thereby improving the aerodynamic performance of the fan system.

[0010] Preferably, the volute further includes an oil leakage hole, which is located at the bottom of the volute away from the outlet of the volute. The axis of the oil leakage hole coincides with the centerline of the volute, and the first bend and the second bend are both arranged symmetrically about the axis of the oil leakage hole.

[0011] In this solution, the above-mentioned settings, compared to the offset settings of the first and second bends, make the second bend have less impact on the fluid.

[0012] Preferably, the bending dimensions of the first bending portion and the second bending portion gradually decrease from the axis of the oil leakage hole toward the opposite sides of the volute.

[0013] In this solution, the above-mentioned settings make the size reduction of the front cover with the first bend and the second bend more balanced, avoiding abnormal flow separation caused by large local bends.

[0014] Preferably, the cross-sectional profile of the first bend is a straight line.

[0015] In this scheme, the above-mentioned settings, compared to other cross-sectional shapes, enable the first bend to play a certain guiding role in the radial direction of the volute flow channel, thus preventing flow separation.

[0016] Preferably, the cross-sectional profile of the second bend is a straight profile.

[0017] In this scheme, the above-mentioned settings, compared to other cross-sectional shapes, enable the second bend to play a certain guiding role in the radial direction of the volute flow channel, thus preventing flow separation.

[0018] Preferably, the first bent portion is at the same angle as the front or rear cover of the volute, and the second bent portion is at a smaller angle than the first bent portion.

[0019] In this scheme, the bending angle of the second bend relative to the first bend is limited by the above settings, thereby reducing the influence of the second bend on the fluid and ensuring that the volute flow channel with the first bend and the second bend always maintains a continuous expansion flow pattern.

[0020] Preferably, the angle between the first bent portion and the front or rear cover of the volute is α, wherein the value of α ranges from 150 to 180°.

[0021] In this solution, by limiting the bending angle between the first bend and the front or rear cover, the volute of the fan system can be adapted to the larger upper and smaller lower space of the housing, so that it can be installed inside the housing.

[0022] Preferably, the angle between the second bend and the front cover of the volute is β, wherein the value of β ranges from 90 to 140°.

[0023] In this solution, by limiting the bending angle between the second bend and the front cover, the bottom of the front cover of the volute can be kept parallel to the bottom of the housing, thereby eliminating the height difference between the front and rear covers of the tilted volute. This makes the aerodynamic performance of the volute with the first bend and the second bend better than that of a fan system with only a chamfer.

[0024] Preferably, along the height direction of the volute, the bottom of the front cover of the volute away from the outlet of the volute is reduced by 10-25mm from the bottom of the housing away from the outlet of the volute by the second bend.

[0025] In this solution, the aforementioned settings allow the reduced height difference to be used as the overall extension height of the fan system. This means the fan system can be increased in height along the casing, resulting in a larger volute flow channel and better aerodynamic performance. Alternatively, the casing height can be reduced while maintaining the original performance, adapting to different kitchen installation environments.

[0026] A downdraft range hood, the downdraft range hood including the fan system described above.

[0027] In this design, the down-mounted range hood includes the aforementioned fan system. The first and second bends, combined with the tilted fan system, eliminate the height difference between the bottom of the front and rear covers of the volute, ensuring continuous expansion of the volute's flow channel and resulting in better aerodynamic performance. Furthermore, after eliminating the height difference, whether the aerodynamic performance is improved by increasing the overall height of the fan system or by maintaining the same height compared to a fan system with only beveled corners, the aerodynamic performance of the fan system is enhanced, meeting users' demands for high-performance fume capture.

[0028] The positive and progressive effects of this invention are as follows: By setting a first bending portion, the bottom area of ​​the volute of the fan system is reduced in size along the width direction of the volute, thus enabling it to be fitted to the narrowed bottom of the housing. Furthermore, with the first bending portion, and the volute tilted within the housing, there is a height difference between the front and rear covers. By setting a second bending portion, which cooperates with the first bending portion and connects end-to-end, the bottom size of the front cover is further reduced along the height direction of the housing, making the bottom of the volute parallel to the bottom of the housing. This eliminates the height difference between the front and rear covers in the bottom area of ​​the volute. Thus, without altering the basic shape of the continuously expanding volute flow channel, the second bending portion provides a certain degree of flow guidance in the radial direction of the volute flow channel, conforming to the fluid expansion law and having minimal impact on the fluid.

[0029] Furthermore, based on the first and second bends, the height difference at the bottom of the volute is eliminated, allowing for a further reduction in the overall height of the volute along the height of the housing. Compared to a volute of the same height, this results in better aerodynamic performance and suitability for smaller housings. Alternatively, with the internal space of the housing unchanged, the reduction in the bottom dimension of the volute allows for a further increase in the overall volume of the volute. Specifically, the volute dimension can be increased along the height of the housing, thereby improving the aerodynamic performance of the fan system. Attached Figure Description

[0030] Figure 1 This is a perspective view of a preferred embodiment of the down-mounted range hood of the present invention.

[0031] Figure 2 This is a diagram showing the positional relationship between the first bend and the second bend in a preferred embodiment of the present invention.

[0032] Figure 3 This is a perspective view of a fan system according to a preferred embodiment of the present invention.

[0033] Figure 4 This is a schematic diagram of the structure of the first bending portion and the second bending portion according to a preferred embodiment of the present invention.

[0034] Figure 5This is a diagram showing the positional relationship of the fan system with the oil leakage hole in a preferred embodiment of the present invention.

[0035] Figure 6 This is a schematic diagram of a preferred embodiment of the present invention, showing the first and second bending portions arranged symmetrically about the axis of the oil leakage hole.

[0036] Explanation of reference numerals in the attached figures:

[0037] Box 1

[0038] Air inlet 11

[0039] Snail Shell 2

[0040] Front cover 21

[0041] Back cover 22

[0042] First bend 23

[0043] Second bend 24

[0044] Exports 25

[0045] Oil leak hole 26 Detailed Implementation

[0046] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0047] This embodiment provides a fan system, the specific structure of which is as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the fan system is installed at an angle inside the range hood housing 1. The fan system includes a volute 2, and the volute 2 includes:

[0048] The first bending part 23 is disposed on the front cover 21 and the rear cover 22 of the volute 2 and is disposed away from the outlet 25 of the volute 2. The first bending part 23 is disposed inclined from the front cover 21 and the rear cover 22 of the volute 2 toward the cavity of the volute 2.

[0049] The second bending part 24 is disposed on the front cover 21 of the volute 2 and is disposed corresponding to the air inlet 11 of the housing 1. The second bending part 24 is disposed away from the outlet 25 of the volute 2 and is inclined from the front cover 21 of the volute 2 toward the cavity of the volute 2. The first bending part 23 and the second bending part 24 are connected end to end. The first bending part 23 is located between the second bending part 24 and the outlet 25 of the volute 2. The bottom of the front cover 21 of the volute 2 away from the outlet 25 of the volute 2 is parallel to the bottom of the housing 1 away from the outlet 25 of the volute 2.

[0050] Specifically, the first bending portion 23 and the second bending portion 24 are made of sheet metal. The first bending portion 23 is disposed on the surface of the front cover 21 and the rear cover 22, and the second bending portion 24 is disposed on the front cover 21. The front cover 21 faces the air inlet 11, and the rear cover 22 faces away from the air inlet 11. From the cross-sectional direction, the front cover 21 and the rear cover 22 narrow at the bottom of the volute 2 through the first bending portion 23, specifically in the thickness direction of the volute 2. It can be understood that the thickness direction of the volute 2 is the direction of the distance between the front cover 21 and the rear cover 22, also known as the width direction, which will not be elaborated further here. By setting the first bending portion 23, the bottom area of ​​the volute 2 of the fan system is reduced in size along the width direction of the volute 2, thereby adapting to the narrowed bottom of the housing 1 and facilitating the installation of the volute 2 inside the housing 1.

[0051] Furthermore, when the volute 2 is tilted inside the housing 1, there is a height difference between the front cover 21 and the rear cover 22. This is because the volute 2 has a certain thickness. When the fan system is tilted, the thickness will have a component in the height direction of the housing 1. The larger the tilt angle, the more this component there is. This manifests as a lack of uniformity in the vertical height of the front and rear covers of the volute 2. The bottom of the front cover 21 extends further toward the bottom of the housing 1 than the bottom of the rear cover 22. The larger the tilt angle and thickness of the volute 2, the greater the vertical height difference between the bottoms of the front and rear covers. Based on the first bending portion 23, this embodiment adds a second bending portion 24. The second bending portion 24 cooperates with the first bending portion 23 and is connected end to end. The front cover 21 is further narrowed at the bottom of the volute 2 by the second bending portion 24. From the cross-sectional direction, the second bending portion 24 can further reduce the bottom size of the front cover 21 along the height direction of the housing 1, and make the bottom of the volute 2 parallel to the bottom of the housing 1, so as to eliminate the height difference between the front cover 21 and the rear cover 22 in the bottom area of ​​the volute 2. Thus, without changing the basic shape of the continuous expansion of the flow channel of the volute 2, the second bending portion 24 plays a certain guiding role in the radial direction of the flow channel of the volute 2, which conforms to the fluid expansion law and has little impact on the fluid.

[0052] It should be noted that the continuous expansion of fluid within the volute 2 flow channel is simulated using existing finite element analysis software. This embodiment does not improve the simulation method of the finite element analysis software; it only simulates the fluid flow state within the volute having the first bend 23 and the second bend 24. This is existing technology and will not be elaborated upon here.

[0053] This embodiment eliminates the height difference between the front and rear covers by using the first bend 23 and the second bend 24. This overcomes the traditional design of the volute 2, where the reduction of the flow channel width due to the chamfering reduces aerodynamic performance. By adjusting the height difference between the front and rear covers, the flow loss of the fan system is reduced to achieve better aerodynamic performance. For example, with the first bend 23 and the second bend 24, the height difference at the bottom of the volute 2 is eliminated. Along the height direction of the housing 1, the overall height of the volute 2 can be further reduced, resulting in better aerodynamic performance compared to a volute 2 of the same height. It can also be applied to smaller housings 1. Alternatively, with the internal space of the housing 1 unchanged, the bottom dimension of the volute 2 is reduced, allowing for a further increase in the overall volume of the volute 2. Specifically, the overall dimension of the volute 2 can be increased along the height direction of the housing 1, resulting in a larger flow channel and thereby improving the aerodynamic performance of the fan system.

[0054] In this embodiment, the volute 2 also includes an oil leakage hole 26. The oil leakage hole 26 is located at the bottom of the volute 2 away from the outlet 25 of the volute 2. The axis of the oil leakage hole 26 coincides with the center line of the volute 2. The first bending portion 23 and the second bending portion 24 are both arranged symmetrically about the axis of the oil leakage hole 26.

[0055] Specifically, the oil leakage hole 26 is provided on the second bend 24 and one side edge of the oil leakage hole 26 is located at the joint of the first bend 23 and the second bend 24. It can be understood that by providing the second bend 24, the bottom height dimension of the front cover 21 is reduced, and the bottom of the front cover 21 is the lowest point of the volute 2. Thus, by providing the oil leakage hole 26 on the second bend 24, it can be ensured that oil droplets can effectively flow out from the volute 2.

[0056] Furthermore, the axis of the oil drain hole 26 coincides with the center line of the volute 2. The first bend 23 and the second bend 24 are both symmetrically arranged with the axis of the oil drain hole 26 as the axis. Compared with the first bend 23 and the second bend 24 being offset relative to the axis of the oil drain hole 26, the first bend 23 and the second bend 24 have the same bending area on the left and right sides of the center line of the volute 2. When the fluid passes through the bottom area of ​​the front cover 21, the flow is more stable, avoiding flow separation and flow loss. Similarly, the front cover 21 with the second bend 24 has less impact on the fluid.

[0057] Furthermore, in this embodiment, the bending dimensions of the first bending portion 23 and the second bending portion 24 gradually decrease from the axis of the oil leakage hole 26 towards the opposite sides of the volute 2. Specifically, this includes a gradual decrease in bending dimensions from top to bottom along the height direction of the housing 1, and a gradual decrease in bending dimensions from the centerline of the volute 2 outwards on both sides. That is to say, the first bending portion 23 and the second bending portion 24 have a larger bending in the central region of the bottom of the volute 2, while the bending dimensions gradually decrease in the region where the bottom height of the volute 2 gradually increases along the height direction of the housing 1. This makes the size reduction of the front cover 21 with the first bending portion 23 and the second bending portion 24 more balanced, avoiding abnormal flow separation caused by large local bending.

[0058] In this embodiment, the cross-sectional profile of the first bending portion 23 is a straight line. That is, the first bending portion 23 is a flat plate. When the bottom area of ​​the front cover 21 is bent by the first bending portion 23, compared with other cross-sectional profiles, such as arc profiles, the first bending portion 23 can play a more stable guiding role in the radial direction of the flow channel of the volute 2, and avoid flow separation.

[0059] In this embodiment, the cross-sectional profile of the second bending portion 24 is a straight line. That is, the second bending portion 24 is a flat plate. When the bottom area of ​​the front cover 21 is bent by the second bending portion 24, compared with other cross-sectional profiles, such as arc profiles, the second bending portion 24 can play a more stable guiding role in the radial direction of the flow channel of the volute 2, and avoid flow separation.

[0060] In this embodiment, the first bending portion 23 is at the same tilt angle as the front cover 21 or the rear cover 22 of the volute 2, and the second bending portion 24 is at a smaller tilt angle than the first bending portion 23.

[0061] Specifically, the first bending portion 23 is used to reduce the dimensions of the volute 2 in the width or thickness direction so that the volute 2 can be fitted into the housing 1, which has a triangular cross-section that is larger at the top and smaller at the bottom. In order to avoid the front cover 21 bending too much into the cavity of the volute 2 and increasing the flow channel loss when the second bending portion 24 is provided, the bending angle of the second bending portion 24 relative to the first bending portion 23 is limited to reduce the influence of the second bending portion 24 on the fluid, so that the flow channel of the volute 2 with the first bending portion 23 and the second bending portion 24 always maintains a continuous expansion flow pattern.

[0062] Furthermore, in this embodiment, the angle between the first bent portion 23 and the front cover 21 or rear cover 22 of the volute 2 is α, where the value of α ranges from 150 to 180°. By limiting the bending angle between the first bent portion 23 and the front cover 21 or rear cover 22, it is ensured that the volute 2 of the fan system can fit into the space of the housing 1, which is larger at the top and smaller at the bottom, so that it can be installed inside the housing 1.

[0063] Preferably, α is 157.5°.

[0064] In this embodiment, the angle between the second bend 24 and the front cover 21 of the volute 2 is β, where β ranges from 90° to 140°. By limiting the bending angle between the second bend 24 and the front cover 21, the bottom of the front cover 21 of the volute 2 can be kept parallel to the bottom of the housing 1, thereby eliminating the height difference between the inclined front cover 21 and the rear cover 22 of the volute 2. This results in better aerodynamic performance of the volute 2 with the first bend 23 and the second bend 24 compared to a fan system with only a chamfer.

[0065] Preferably, β is 127.5°.

[0066] In this embodiment, along the height direction of the volute 2, the bottom of the front cover 21 of the volute 2 away from the outlet 25 of the volute 2 is reduced by 10-25mm by the second bend 24.

[0067] Specifically, in a fan system with only chamfered corners, the extension dimension of the front cover 21 of the volute 2 is greater than that of the rear cover 22, and the height difference between the front cover 21 and the rear cover 22 in the bottom region of the volute 2 is h. In this embodiment, a second bending portion 24 is provided to eliminate the height difference between the front cover 21 and the rear cover 22 in the bottom region of the volute 2, so that the reduced height difference can be used as the overall extension height of the fan system. That is, the fan system can be increased in height along the height direction of the housing 1, resulting in a larger volute flow channel and better aerodynamic performance. Alternatively, while maintaining the original performance, the height of the housing 1 can be reduced to adapt to different kitchen installation environments.

[0068] This embodiment also provides a down-mounted range hood, which includes the aforementioned fan system. The down-mounted range hood utilizes the first bend 23 and the second bend 24 in conjunction with the inclined fan system to eliminate the height difference between the bottom of the front and rear covers of the volute 2, ensuring that the flow channel of the volute 2 is continuously expanded, resulting in better aerodynamic performance. Furthermore, after eliminating the height difference, whether the aerodynamic performance is improved by increasing the overall height of the fan system, or compared to a fan system with only chamfered corners while keeping the height of the fan system unchanged, the aerodynamic performance of the fan system is improved, meeting users' needs for high-performance fume capture.

[0069] Furthermore, the down-mounted range hood in this embodiment can also be controlled by a voice module. The panel of the down-mounted range hood can be equipped with a controller, a voice receiving module, and a voice parsing module, which are based on existing technologies. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller starts or stops the down-mounted range hood accordingly, thereby realizing intelligent control of the down-mounted range hood and improving the user experience.

[0070] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A fan system, wherein the fan system is inclinedly disposed within the housing of a range hood, the fan system comprising a volute, characterized in that, The volute includes: The first bending portion is disposed on the front cover and the rear cover of the volute and is disposed away from the outlet of the volute. The first bending portion is inclined from the front cover and the rear cover of the volute toward the cavity of the volute. The second bend is disposed on the front cover of the volute and corresponds to the air inlet of the housing. The second bend is disposed away from the outlet of the volute and is inclined from the front cover of the volute toward the cavity of the volute. The first bend and the second bend are connected end to end. The first bend is located between the second bend and the outlet of the volute. The bottom of the front cover of the volute away from the outlet of the volute is parallel to the bottom of the housing away from the outlet of the volute.

2. The fan system as described in claim 1, characterized in that, The volute also includes an oil leakage hole, which is located at the bottom of the volute away from the outlet of the volute. The axis of the oil leakage hole coincides with the center line of the volute. The first bend and the second bend are both arranged symmetrically about the axis of the oil leakage hole.

3. The fan system as described in claim 2, characterized in that, The bending dimensions of the first and second bending portions gradually decrease from the axis of the oil leakage hole toward the opposite sides of the volute.

4. The fan system as described in claim 1, characterized in that, The cross-sectional profile of the first bend is a straight line.

5. The fan system as described in claim 1, characterized in that, The cross-sectional profile of the second bend is a straight line.

6. The fan system as described in claim 1, characterized in that, The first bent portion has the same inclination angle as the front or rear cover of the volute, and the second bent portion has a smaller inclination angle than the first bent portion.

7. The fan system as described in claim 1, characterized in that, The angle between the first bent portion and the front or rear cover of the volute is α, where the value of α ranges from 150 to 180°.

8. The fan system as described in claim 1, characterized in that, The angle between the second bend and the front cover of the volute is β, where the value of β ranges from 90 to 140°.

9. The fan system as described in claim 1, characterized in that, Along the height direction of the volute, the bottom of the front cover of the volute away from the outlet of the volute is reduced by 10-25mm from the bottom of the housing away from the outlet of the volute by the second bend.

10. A down-mounted range hood, characterized in that, The down-mounted range hood includes the fan system as described in any one of claims 1-9.

Images