Noise reduction type range hood

Abstract

The utility model discloses a noise reduction type range hood which comprises a machine shell and a draught fan, a containing cavity used for containing the draught fan is arranged in the machine shell, a main smoke suction opening communicated with the containing cavity is formed in the machine shell, the draught fan comprises a volute, and an air inlet communicated with the main smoke suction opening and an air outlet used for discharging oil smoke out of the machine shell are formed in the volute. An impeller is arranged in the volute, a driver for driving the impeller to rotate is arranged on the volute, an air guide ring is further arranged on the volute, a plurality of protrusions extending into the air inlet are arranged on the air guide ring, and turbulent air at the air inlet can be scattered through the protrusions, so that the air flows more quickly and stably, and the air noise is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to a noise reduction range hood. Background Art

[0002] As one of the indispensable appliances in modern kitchens, the main function of range hoods is to remove the fumes and odors generated during cooking to keep the kitchen air fresh. However, traditional range hoods are often accompanied by loud noises when working, which not only affects the user experience, but long-term exposure to high-decibel environments may also have adverse effects on people's hearing health.

[0003] In order to improve the exhaust efficiency, the existing range hoods usually use high-power fans to increase the wind pressure and air volume. Although this can effectively improve the suction force, it also aggravates the noise problem during operation. The main sources of noise include aerodynamic noise generated by the friction between the fan blades and the air, and structural noise caused by mechanical vibration.

[0004] The utility model is made based on the above situation. Utility Model Content

[0005] The utility model overcomes the shortcomings of the prior art and provides a noise reduction range hood.

[0006] The utility model is realized by the following technical solutions:

[0007] A noise reduction range hood comprises a casing and a fan, wherein a placement cavity for placing the fan is provided in the casing, a main smoke inlet communicated with the placement cavity is provided on the casing, the fan comprises a volute, an air inlet communicated with the main smoke inlet and an air outlet for discharging oil smoke out of the casing is provided on the volute, an impeller is provided in the volute, a driver for driving the impeller to rotate is provided on the volute, an air guide ring is also provided on the volute, and a plurality of protrusions extending into the air inlet are provided on the air guide ring.

[0008] In the noise reduction range hood as described above, the air guide ring further comprises a convex ring extending into the air inlet, and the protrusion is arranged on the convex ring.

[0009] In the noise reduction range hood as described above, the protrusion is arranged at the end of the protruding ring, and the entire end of the protruding ring is provided with the protrusion.

[0010] In the noise reduction range hood as described above, a protrusion is partially provided on the end of the convex ring.

[0011] In the noise reduction range hood as described above, the impeller includes a blade disk and a plurality of blades connected to the blade disk, and a plurality of grooves are provided on the edges of the blades to form a wavy or serrated anti-turbulence structure.

[0012] In the noise reduction range hood as described above, the entire outer edge of the blade is provided with an anti-turbulence structure.

[0013] In the noise reduction range hood as described above, the inner edge of the blade is provided with a smooth edge section and one or more sections of anti-turbulence structure.

[0014] In the noise reduction range hood as described above, the cross section of the blade is arc-shaped.

[0015] In the noise reduction range hood as described above, the housing is further provided with a plurality of secondary air inlet holes arranged at staggered intervals, and the secondary air inlet holes are communicated with the placement cavity.

[0016] In the noise reduction range hood as described above, the air inlet faces the back of the casing, a noise reduction plate for noise reduction is provided on the side wall of the placement cavity, and the air inlet faces the noise reduction plate.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] 1. The volute is also provided with an air guide ring, which is provided with multiple protrusions extending into the air inlet. The protrusions can disperse the turbulent wind at the air inlet, so that the wind flow is faster and smoother, thereby reducing wind noise.

[0019] 2. A plurality of grooves are arranged on the edge of the blade to form a wavy or serrated anti-turbulence structure. The anti-turbulence structure breaks up the wind in the volute and limits the generation of eddies, thereby making the wind flow faster and smoother, thereby reducing wind noise.

[0020] 3. The entire outer edge of the blade is provided with an anti-turbulence structure, and the inner edge of the blade is provided with a smooth edge section and one or more anti-turbulence structures. The smooth edge section is used to increase the air intake, thereby ensuring that there is sufficient air volume to absorb oil smoke.

[0021] 4. The casing is also provided with a plurality of secondary air inlet holes which are arranged at staggered intervals. The secondary air inlet holes are arranged at staggered intervals to reduce air convection, effectively reduce air flow collision and reduce noise.

[0022] 5. The air inlet faces the back of the casing, and a noise reduction plate is provided on the side wall of the cavity for noise reduction. The air inlet faces the noise reduction plate, which effectively reduces the flow resistance of the airflow in the casing, increases the gas flow, reduces the resistance, reduces the noise, and at the same time reduces the noise through the noise reduction plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 ;

[0026] Figure 3 This is a cross-sectional view of the utility model when the main smoking port is closed. Figure 1 ;

[0027] Figure 4 This is a cross-sectional view of the utility model when the main smoking port is closed. Figure 2 ;

[0028] Figure 5 It is a cross-sectional schematic diagram of the utility model when the main smoking port is opened;

[0029] Figure 6 It is a structural schematic diagram of the blower in the utility model;

[0030] Figure 7 It is a structural schematic diagram of the air guide ring in the utility model;

[0031] Figure 8 It is a cross-sectional schematic diagram of the impeller in the utility model;

[0032] Fig. 9 It is a flattened schematic diagram of the blade in the utility model;

[0033] Fig.10 It is a cross-sectional schematic diagram of the air guide ring in the utility model. DETAILED DESCRIPTION

[0034] The utility model is further described below in conjunction with the accompanying drawings:

[0035] like Figures 1 to 10 A noise reduction range hood shown includes a housing 1 and a fan 2, wherein a placement cavity 11 for placing the fan 2 is provided in the housing 1, a main inlet 3 communicating with the placement cavity 11 is provided on the housing 1, and the fan 2 includes a volute 21, an air inlet 211 communicating with the main inlet 3 and an air outlet 212 for discharging oil smoke out of the housing 1 are provided on the volute 21, an impeller 22 is provided in the volute 21, a driver 23 for driving the impeller 22 to rotate is provided on the volute 21, and an air guide ring 5 is also provided on the volute 21, and a plurality of protrusions 52 extending into the air inlet 211 are provided on the air guide ring 5. The turbulent wind at the air inlet 211 can be dispersed by the protrusions 52, so that the wind flows faster and more smoothly, thereby reducing wind noise.

[0036] In some embodiments, the air guide ring 5 is in a circular ring shape and is connected to the volute 21 by threaded fasteners or other connection methods such as welding.

[0037] Furthermore, the air guide ring 5 also includes a convex ring 51 extending into the air inlet 211, and the protrusion 52 is provided on the convex ring 51, thereby forming a wave-like structure or a sawtooth-like structure. The cross section of the convex ring 51 is arc-shaped, and the arc-shaped protrusion faces the outer side of the air inlet 211. The convex ring 51 and the air guide ring 5 are an integrated structure.

[0038] Furthermore, the protrusion 52 is provided at the end of the protruding ring 51 , and the entire end of the protruding ring 51 is provided with the protrusion 52 ; of course, the protrusion 52 may also be partially provided at the end of the protruding ring 51 .

[0039] In some embodiments, the impeller 22 includes a blade disk 221 and a plurality of blades 222 connected to the blade disk 221. The edges of the blades 222 are provided with a plurality of grooves 2221 to form an anti-turbulence structure with a wave-like structure or a sawtooth-like structure. The anti-turbulence structure is used to break up the wind in the volute 21 and limit the generation of eddies, thereby making the wind flow faster and smoother, thereby reducing wind noise. The blades 222 can be connected to the blade disk 221 by threaded fasteners, and can certainly be inserted into the blade disk 221, and the distance between the blade disks 221 on both sides is limited to clamp the blades 222 to prevent them from coming out, or other connection methods can be used for fixed connection.

[0040] Specifically, the outer edge of the blade 222 is provided with an anti-turbulence structure. The inner edge of the blade 222 is provided with a smooth edge section 2222 and one or more anti-turbulence structures, and the smooth edge section 2222 is used to increase the air intake, thereby ensuring that there is enough air volume to absorb oil smoke. The cross section of the blade 222 is arc-shaped, which is more conducive to air supply.

[0041] In some embodiments, the housing 1 is further provided with a plurality of secondary air inlet holes 6 arranged at staggered intervals, wherein the secondary air inlet holes 6 are connected to the placement cavity 11, and the secondary air inlet holes 6 are staggered to reduce air convection, effectively reduce airflow collision, and reduce noise.

[0042] In some embodiments, the air inlet 211 faces the back of the housing 1, and a noise reduction plate 7 for noise reduction is provided on the side wall of the placement cavity 11. The air inlet 211 faces the noise reduction plate 7, which effectively reduces the flow resistance of the airflow in the housing 1, increases the gas flow, reduces the resistance, reduces the noise, and reduces the noise through the noise reduction plate 7. The noise reduction plate 7 can be a composite honeycomb noise reduction plate or other types of noise reduction plates 7. The noise reduction plate 7 can be connected and fixed in the housing 1 by threaded fasteners or other connection methods.

[0043] In some embodiments, the main air inlet 211 is disposed at the lower portion of the casing 1 , and a lifting frame 8 and a driving assembly 81 for driving the lifting frame 8 to move up and down are also disposed on the casing 1 , and a first shielding portion for covering the main air inlet 211 is disposed at the lower portion of the lifting frame 8 .

[0044] Specifically, the driving assembly 81 can be a linear module, a screw lifting assembly, or other lifting structures. The first shielding portion is connected to the lifting frame 8 through a threaded fastener or other connecting structure.

[0045] In some embodiments, an oil groove for holding oil is provided at the upper portion of the first shielding portion to form an oil cup 4, a first oil guide plate 91 for guiding oil into the oil cup 4 is provided on the lifting frame 8, and a second oil guide plate 92 for guiding oil to drip onto the first oil guide plate 91 is provided at the lower portion of the fan 2. The first oil guide plate 91 is connected to the lifting frame 8 by threaded fasteners or other connecting structures. The second oil guide plate 92 is connected to the volute 21 or the casing 1 by threaded fasteners or other connecting structures.

[0046] A control unit 10 for controlling the operation of the driver 23 and the driving assembly 81 is also provided in the housing 1. The control unit 10 may be a control chip, an electric control switch or an electric control box.

Claims

1. A noise reduction range hood, characterized in that: The invention comprises a casing (1) and a fan (2), wherein a placement cavity (11) for placing the fan (2) is provided in the casing (1), a main inhalation port (3) communicated with the placement cavity (11) is provided on the casing (1), the fan (2) comprises a volute (21), an air inlet (211) communicated with the main inhalation port (3) and an air outlet (212) for discharging oil smoke out of the casing (1), an impeller (22) is provided in the volute (21), a driver (23) for driving the impeller (22) to rotate is provided on the volute (21), and an air guide ring (5) is also provided on the volute (21), and a plurality of protrusions (52) extending into the air inlet (211) are provided on the air guide ring (5).

2. The noise reduction range hood according to claim 1, characterized in that: The air guide ring (5) further comprises a convex ring (51) extending into the air inlet (211), and the protrusion (52) is arranged on the convex ring (51).

3. The noise reduction range hood according to claim 2, characterized in that: The protrusion (52) is arranged at the end of the protruding ring (51), and the entire end of the protruding ring (51) is provided with the protrusion (52).

4. The noise reduction range hood according to claim 2, characterized in that: A protrusion (52) is partially provided at the end of the protruding ring (51).

5. A noise reduction range hood according to claim 3 or 4, characterized in that: The impeller (22) comprises a blade disk (221) and a plurality of blades (222) connected to the blade disk (221); a plurality of grooves (2221) are provided on the edges of the blades (222) to form a turbulence prevention structure with a wave-like structure or a sawtooth-like structure.

6. The noise reduction range hood according to claim 5, characterized in that: The entire outer edge of the blade (222) is provided with an anti-turbulence structure.

7. The noise reduction range hood according to claim 6, characterized in that: The inner edge of the blade (222) is provided with a smooth edge section (2222) and one or more sections of anti-turbulence structure.

8. The noise reduction range hood according to claim 7, characterized in that: The cross section of the blade (222) is arc-shaped.

9. The noise reduction range hood according to claim 1, characterized in that: The housing (1) is also provided with a plurality of secondary air inlet holes (6) arranged at staggered intervals, and the secondary air inlet holes (6) are communicated with the placement cavity (11).

10. The noise reduction range hood according to claim 1, characterized in that: The air inlet (211) faces the back of the housing (1); a noise reduction plate (7) for reducing noise is provided on the side wall of the placement cavity (11); and the air inlet (211) faces the noise reduction plate (7).

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