Tandem type double-fan range hood

Abstract

The utility model relates to the technical field of range hoods, in particular to a tandem type double-fan range hood. The tandem type double-fan range hood comprises an exhaust fume collecting hood, an air bellow, an upper fan and a lower fan, the air bellow is installed above the exhaust fume collecting hood in a communicating mode, the upper fan is obliquely installed in the air bellow in the height direction, and the lower fan is obliquely installed in the exhaust fume collecting hood in the height direction. The cross section area of the lower fan is larger than that of the upper fan, and the thickness of the lower fan is smaller than that of the upper fan. In the tandem type double-fan range hood, according to the size of the internal space of the exhaust fume collecting hood and the size of the internal space of the air bellow, the upper fan which is relatively small in cross section area and relatively large in thickness is obliquely installed in the air bellow, and the lower fan which is relatively large in cross section area and relatively small in thickness is obliquely installed in the exhaust fume collecting hood, so that the internal space of the exhaust fume collecting hood and the internal space of the air bellow are fully utilized; the structure compactness of the tandem type double-fan range hood is improved, the situation that the size and height of the tandem type double-fan range hood are too large is avoided, and installation and use of the tandem type double-fan range hood are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to a series-connected double-fan range hood. Background Art

[0002] A tandem dual-fan range hood uses two upper and lower fan stages to increase the air pressure of the fan system, enabling a larger exhaust volume during operation. The fan speeds of the upper and lower fans do not need to be very high to meet the range hood's requirements for efficient and quiet air intake. Existing tandem dual-fan range hoods are too large and tall due to the installation of two upper and lower fan sets. This means that the installation space required for these tandem dual-fan range hoods is too large, making them difficult to install and operate. Utility Model Content

[0003] The technical problem solved by the present invention is to provide a series-type double-fan range hood, which can effectively solve the technical problem in the prior art that the series-type double-fan range hood is too large in size and height, resulting in inconvenience in installation and use.

[0004] The above technical problems are solved by the following technical solutions:

[0005] A series double-fan range hood, comprising a smoke hood, a bellows, an upper fan and a lower fan, wherein the bellows is connected and installed above the smoke hood, the upper fan is installed in the bellows at an angle along the height direction, and the lower fan is installed in the smoke hood at an angle along the height direction;

[0006] The cross-sectional area of ​​the lower fan is greater than the cross-sectional area of ​​the upper fan, and the thickness of the lower fan is less than the thickness of the upper fan.

[0007] Compared with the background technology, the series-connected double-fan range hood of the present invention has the following beneficial effects:

[0008] In a series-type dual-fan range hood, the upper fan with a relatively small cross-sectional area and a relatively large thickness is installed at an angle in the wind box, and the lower fan with a relatively large cross-sectional area and a relatively small thickness is installed at an angle in the smoke hood, according to the size of the internal space of the smoke hood and the wind box, so as to make full use of the internal space of the smoke hood and the wind box, improve the structural compactness of the series-type dual-fan range hood, avoid the series-type dual-fan range hood from being too large in size and height, and facilitate the installation and use of the series-type dual-fan range hood.

[0009] In one embodiment, the inclination angle of the upper fan is not equal to the inclination angle of the lower fan.

[0010] In one embodiment, the inclination angle of the upper fan is smaller than the inclination angle of the lower fan.

[0011] In one embodiment, the inclination angle of the upper fan is 10° to 20°, and the inclination angle of the lower fan is 15° to 25°.

[0012] In one embodiment, a partition is sealed between the wind box and the smoke hood, the partition is provided with ventilation holes, the bottom of the upper fan is set on the partition, and the smoke exhaust port of the lower fan is located in the smoke hood and is connected to the ventilation holes.

[0013] In one embodiment, a projection of the bottom end surface of the upper fan on the partition along the height direction does not overlap with the ventilation hole.

[0014] In one embodiment, the smoke collecting hood is provided with a smoke outlet, an oil net is installed at the smoke collecting outlet, the down fan is installed in the smoke collecting hood at an angle along the height direction, and the smoke inlet of the down fan is arranged adjacent to the oil net.

[0015] In one embodiment, the smoke inlet of the downblower is parallel to the oil screen.

[0016] In one embodiment, the projection of the smoke inlet of the downwind fan on the smoke collecting hood along the thickness direction falls entirely within the oil net.

[0017] In one embodiment, the series-connected dual-fan range hood further includes a DC motor, and both the upper fan and the lower fan are electrically connected to the DC motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the internal structure of a series-type dual-fan range hood provided by an embodiment of the present utility model;

[0019] Figure 2 This is a side view of the internal structure of a series-type dual-fan range hood provided by an embodiment of the present utility model;

[0020] Figure 3 It is a schematic diagram of the assembly structure of the down fan and the partition provided in an embodiment of the present utility model.

[0021] Description of labels:

[0022] 1. Fume hood; 12. Oil screen; 13. Opening and closing plate; 14. Smoke collecting plate; 2. Bellows; 21. Partition; 211. Ventilation hole; 22. Exhaust outlet; 3. Upper fan; 4. Lower fan. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0024] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0026] In the existing series-type dual-fan range hood, the volume and height of the series-type dual-fan range hood are too large due to the installation of two sets of upper and lower fans. That is, the installation space required for the series-type dual-fan range hood is too large, which is not conducive to the installation and use of the series-type dual-fan range hood.

[0027] To solve the above problems, Figure 1 and Figure 2As shown, the embodiment proposes a series type double-fan range hood, which comprises a smoke collecting hood 1, a wind box 2, an upper fan 3 and a lower fan 4. The wind box 2 is communicatively installed above the smoke collecting hood 1. The upper fan 3 is obliquely installed in the wind box 2 along the height direction (up-down direction in the figure). The lower fan 4 is obliquely installed in the smoke collecting hood 1 along the height direction. The cross-sectional area of the lower fan 4 is larger than that of the upper fan 3, and the thickness D1 of the lower fan 4 is smaller than the thickness D2 of the upper fan 3. In the series type double-fan range hood, according to the size of the internal space of the smoke collecting hood 1 and the wind box 2, the upper fan 3 with relatively smaller cross-sectional area and relatively larger thickness is obliquely installed in the wind box 2, and the lower fan 4 with relatively larger cross-sectional area and relatively smaller thickness is obliquely installed in the smoke collecting hood 1, so as to fully utilize the internal space of the smoke collecting hood 1 and the wind box 2, improve the compactness of the series type double-fan range hood, and avoid that the volume and height of the series type double-fan range hood are too large, thereby facilitating the installation and use of the series type double-fan range hood.

[0028] The upper fan 3 and the lower fan 4 in the embodiment are both volute fans. The cross-sectional area of the upper fan 3 and the lower fan 4 refers to the cross-sectional area of the circumferential profile of each volute, i.e. the size of the outer profile of the circumferential profile of the volute. The thickness of the upper fan 3 and the lower fan 4 refers to the axial thickness of each volute, i.e. the thickness of the outer profile of the circumferential profile of the volute.

[0029] According to the structural features of the smoke collecting hood 1 and the wind box 2, the smoke collecting hood 1 has relatively larger width along the left-right direction and relatively smaller depth along the front-rear direction at the bottom. The wind box 2 has relatively smaller width along the left-right direction and relatively larger depth along the front-rear direction. Therefore, the lower fan 3 with relatively larger cross-sectional area and relatively smaller thickness is installed in the smoke collecting hood 1, and the upper fan 4 with relatively smaller cross-sectional area and relatively larger thickness is installed in the wind box 2, so that the upper fan 3 and the lower fan 4 can be smoothly installed in the smoke collecting hood 1 and the wind box 2 on the basis of ensuring smoke exhaust, the internal space of the smoke collecting hood 1 and the wind box 2 is fully utilized, and the compactness of the series type double-fan range hood is increased.

[0030] In actual application, the impeller diameter of the lower fan 4 is generally 260mm-270mm, and the impeller thickness is 120mm. The impeller diameter of the upper fan 3 is generally 250mm-260mm, and the impeller thickness is 140mm-150mm.

[0031] In an embodiment, specifically, the range hood comprises the smoke collecting hood 1, an oil screen 12, an opening and closing plate 13 and a smoke gathering plate 14. The smoke collecting hood 1 is provided with a smoke suction port. The oil screen 12 is installed at the smoke suction port. The opening and closing plate 13 is rotatably installed on the smoke collecting hood 1 and has an opening position for opening the smoke suction port and a closing position for closing the smoke suction port. When the series type double-fan range hood works, the opening and closing plate 13 is turned to the opening position, and the external smoke gas enters the smoke collecting hood 1 along the arrow direction in the figure. Figure 2The direction indicated by the middle arrow passes through the mesh of the oil screen 12 and enters the smoke hood 1. When the tandem dual-fan range hood is shut down, the opening and closing plate 13 flips to the closed position, blocking the smoke outlet. Simultaneously, smoke traps 14 are installed on both sides of the opening and closing plate 13, creating a negative pressure zone in the smoke's ascending path as it enters the smoke outlet, thereby improving smoke extraction efficiency.

[0032] like Figure 1 and Figure 2 As shown, the down fan 4 is installed in the smoke hood 1 at an angle along the height direction, and the smoke inlet of the down fan 4 is arranged adjacent to the oil net 12, so that the smoke inlet of the down fan 4 is close to the oil net 12, shortening the flow path of the smoke entering the smoke hood 1 through the oil net 12 and improving the smoking efficiency.

[0033] Furthermore, the smoke inlet of the downblower 4 is parallel to the oil screen 12. Through the above arrangement, the smoke entering the smoke hood 1 through the oil screen 12 is directly sucked into the volute of the downblower 4, avoiding the problem of the smoke flow turning and changing direction causing the flow rate to decrease, and further improving the smoking efficiency of the downblower 4.

[0034] In one of the embodiments, the projection of the smoke inlet of the downfan 4 in the thickness direction (the axial direction of the volute of the downfan 4) on the smoke hood 1 all falls within the oil net 12, so that the smoke inlet of the downfan 4 is arranged directly opposite the oil net 12, avoiding the problem of excessive turning and changing direction of the oil smoke airflow in the smoke hood 1, resulting in uneven flow, and at the same time, the oil net 12 can completely cover the smoke inlet of the downfan 4, ensuring the air intake of the oil net 12, and further improving the smoke extraction efficiency of the downfan 4.

[0035] like Figure 2 and Figure 3 As shown, a partition 21 is sealed between the bellows 2 and the smoke hood 1. This partition 21 has a ventilation hole 211. The bottom of the upper fan 3 is mounted on the partition 21, and the smoke exhaust port of the lower fan 4 is located within the smoke hood 1 and communicates with the ventilation hole 211. The partition 21 separates the smoke hood 1 from the interior of the bellows 2. Compared to the prior art, the smoke exhaust port of the lower fan 4 is not equipped with a check valve. Instead, it is directly mounted on the ventilation hole 211 and located within the smoke hood 1, not extending beyond the ventilation hole 211. This not only simplifies the structure of the lower fan 4 but also prevents the check valve extending into the bellows 2 from obstructing the flow of smoke from the bellows 2. External oil smoke passes through the oil screen 12 and the smoke hood 1, then enters the volute of the lower fan 4 and enters the bellows 2 through the ventilation hole 211. Under the action of the upper fan 3, it is discharged through the exhaust port 22 at the top of the bellows 2.

[0036] The partition 21 of this embodiment is the bottom plate of the bellows 2, so that the bellows 2 is only provided with an exhaust port 22 at the top and a ventilation hole 211 at the bottom, and the other parts remain closed, so that the bellows 2 is a booster box, which is used to maintain the wind pressure output by the lower fan 4. The lower fan 4 is the main fan, and the upper fan 3 is the booster fan. By utilizing the principle that pressure can be transmitted in a sealed box, the dynamic pressure of the lower fan 4 is converted into static pressure, and the pressure is superimposed after the upper fan 3 is turned on. This produces a boosting effect. The maximum static pressure of a conventional DC single fan is generally 1100Pa, while the upper fan 3 and the lower fan 4 in this embodiment are arranged in series up and down along the height direction. The working state has a very strong correlation. After the boosting output of the upper fan 3, the maximum static pressure can reach 2200Pa, which has the effect of doubling the wind pressure.

[0037] Furthermore, the series-type dual-fan range hood also includes a DC motor, to which both the upper fan 3 and the lower fan 4 are electrically connected. The DC motor provides a DC voltage to each of the upper fan 3 and the lower fan 4, further increasing the air pressure within the volutes of the upper fan 3 and the lower fan 4, thereby further improving the smoke extraction efficiency of the series-type dual-fan range hood.

[0038] like Figure 2 As shown, the projection of the bottom end face of the upper fan 3 on the partition 21 in the height direction does not coincide with the ventilation hole 211, so that the tilted upper fan 3 will not block the ventilation hole 211, that is, it will not affect the normal smoke exhaust of the smoke exhaust port of the lower fan 4, thereby ensuring the smoking efficiency of the lower fan 4.

[0039] In this embodiment, the bottom of the volute of the upper fan 3 has inclined cuts on both sides along the thickness direction, so that the bottom of the volute of the upper fan 3 has a V-shaped structure, which facilitates the installation of the upper fan 3 in the wind box 2. Specifically, an inclined cut at the bottom of the volute of the upper fan 3 near the back plate of the wind box 2 fits with the back plate of the wind box 2, improving the stability of the installation of the upper fan 3 in the wind box 2, achieving a compact arrangement of the upper fan 3, and at the same time avoiding the excessive width of the wind box 2 in the front-to-back direction, reducing the volume of the wind box 2 and the required installation space. The other inclined cut at the bottom of the volute of the upper fan 3 away from the back plate of the wind box 2 can avoid the ventilation holes 211 of the partition 21, preventing the volute of the upper fan 3 from blocking the ventilation holes 211. In addition, the bottom of the volute of the lower fan 4 has inclined cuts on both sides along the thickness direction, so that the bottom of the volute of the lower fan 4 also has a V-shaped structure, which facilitates the installation of the lower fan 4 in the smoke hood 1. Specifically, an inclined notch at the bottom of the volute of the downwind fan 4, near the back plate of the smoke hood 1, fits against the back plate of the smoke hood 1, improving the stability of the downwind fan 4 when installed within the smoke hood 1 and achieving a compact arrangement of the downwind fan 4. Another inclined notch at the bottom of the volute of the downwind fan 4, away from the back plate of the smoke hood 1, avoids interference with the front plate of the smoke hood 1 during installation.

[0040] It should be noted that if Figure 2 As shown in the figure, the inclination angle α of the upper fan 3 is not equal to the inclination angle β of the lower fan 4. Due to the different inclination angles of the upper fan 3 and the lower fan 4, the smoke inlet of the upper fan 3 can be staggered with the smoke outlet of the lower fan 4, that is, the center of the volute of the upper fan 3 (the smoke inlet) is far away from the smoke outlet of the lower fan 4, and the oil smoke entering the wind box 2 is staggered. Figure 2 The path indicated by the middle arrow enters the volute of the upper fan 3, so that there is enough buffer space in the bellows 2 to reduce turbulence caused by the collision of the oil smoke airflow, thereby reducing the noise of the bellows 2 and the upper fan 3.

[0041] In one embodiment, the inclination angle α of the upper fan 3 is smaller than the inclination angle β of the lower fan 4. Due to the smaller inclination angle α of the upper fan 3, the thickness of the bellows 2 along the front-to-back direction is reduced. Furthermore, because α is greater than β, the center of the volute of the upper fan 3 is further away from the smoke exhaust port of the lower fan 4, ensuring that the smoke inlet of the upper fan 3 is staggered with the smoke exhaust port of the lower fan 4. This increases the buffer space within the bellows 2 and improves the noise reduction effect.

[0042] In one embodiment, the inclination angle α of the upper fan 3 is 10° to 20°, and the inclination angle β of the lower fan 4 is 15° to 25°. Specifically, the inclination angle α can be 10°, 12°, 14°, 16°, 18° or 20°, and the inclination angle β can be 15°, 17°, 19°, 21°, 23° or 25°, etc. By setting the inclination angles α and β to the above-mentioned angle range, the smoke hood 1 and the wind box 2 have a suitable volume and installation space. When the inclination angles α and β are too small, the height of the smoke hood 1 and the wind box 2 in the up and down direction is too high. When the inclination angles α and β are too large, the thickness of the smoke hood 1 and the wind box 2 in the front and back direction is too large, which is not conducive to the use and installation of the series-type double-fan range hood.

[0043] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The specific contents of the above-mentioned specific embodiments only express several embodiments of the present invention. Although the description is relatively specific and detailed, it should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the appended claims.

Claims

1. A series double-fan range hood, characterized in that: The invention comprises a smoke collecting hood (1), a wind box (2), an upper fan (3) and a lower fan (4); the wind box (2) is connected and installed above the smoke collecting hood (1); the upper fan (3) is installed in the wind box (2) at an angle along the height direction; and the lower fan (4) is installed in the smoke collecting hood (1) at an angle along the height direction; The cross-sectional area of ​​the lower fan (4) is greater than the cross-sectional area of ​​the upper fan (3), and the thickness of the lower fan (4) is less than the thickness of the upper fan (3).

2. The series-connected double-fan range hood according to claim 1, characterized in that: The inclination angle of the upper fan (3) is not equal to the inclination angle of the lower fan (4).

3. The series-connected double-fan range hood according to claim 2, characterized in that: The inclination angle of the upper fan (3) is smaller than the inclination angle of the lower fan (4).

4. The series-connected double-fan range hood according to claim 3, characterized in that: The inclination angle of the upper fan (3) is 10° to 20°, and the inclination angle of the lower fan (4) is 15° to 25°.

5. The series-connected double-fan range hood according to claim 1, characterized in that: A partition (21) is sealed between the wind box (2) and the smoke hood (1), and a ventilation hole (211) is provided on the partition (21). The bottom of the upper fan (3) is arranged on the partition (21), and the smoke exhaust port of the lower fan (4) is located in the smoke hood (1) and is connected to the ventilation hole (211).

6. The series-connected double-fan range hood according to claim 5, characterized in that: The projection of the bottom end surface of the upper fan (3) on the partition (21) along the height direction does not overlap with the ventilation hole (211).

7. The series-connected double-fan range hood according to claim 1, characterized in that: The smoke collecting hood (1) is provided with a smoke outlet, an oil net (12) is installed at the smoke outlet, the down fan (4) is installed in the smoke collecting hood (1) at an angle along the height direction, and the smoke inlet of the down fan (4) is arranged adjacent to the oil net (12).

8. The series-connected double-fan range hood according to claim 7, characterized in that: The smoke inlet of the down fan (4) is parallel to the oil net (12).

9. The series-connected double-fan range hood according to claim 7, characterized in that: The projection of the smoke inlet of the down fan (4) on the smoke collecting hood (1) along the thickness direction all falls within the oil net (12).

10. The tandem double-fan range hood according to any one of claims 1 to 9, characterized in that: The series-connected dual-fan range hood further comprises a DC motor, and the upper fan (3) and the lower fan (4) are both electrically connected to the DC motor.

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