Noise reduction range hood

Abstract

The invention discloses a noise reduction range hood. The noise reduction range hood comprises a range hood body, the air bellow is arranged in the range hood body; the volute is arranged in the air bellow; an output shaft of the motor is connected with an impeller, and the impeller is located in the volute; the impeller comprises baffle rings and a plurality of blades, the blades are evenly arranged between every two adjacent baffle rings in the same direction, sawteeth are arranged on the sides, facing the rotating direction of the impeller, of the blades and located in the middles of the blades, and when the motor drives the impeller to rotate, the blades are used for combing air flow in the volute and reducing noise. The centrifugal fan can effectively prevent outlet airflow of the blades from being excessively concentrated, noise reduction is facilitated, and it is guaranteed that the dynamic pressure of the air outlet of the centrifugal fan is not attenuated.

Description

Technical Field

[0001] The invention relates to a noise-reducing range hood. Background Art

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. It is installed above the kitchen stove to discharge the exhaust gas produced by combustion out of the room, reducing the harm of the exhaust gas to the human body.

[0003] The impeller is an important part of the range hood, which is used to generate wind to discharge the oil smoke. The impeller in the prior art generally adopts a straight line structure. During the rotation of the impeller, the outlet airflow of the blade is too concentrated, which not only increases the noise, but also makes the dynamic pressure of the centrifugal fan outlet attenuated, affecting the suction and exhaust effect.

[0004] The volute is an important component of the range hood. The volute in the prior art has a large dynamic pressure at the air outlet, which makes the airflow noise large, thereby increasing the noise of the range hood when exhausting smoke. Summary of the invention

[0005] The purpose of the present invention is to provide a technical solution for a noise-reducing range hood in view of the deficiencies in the prior art, which can effectively avoid excessive concentration of the outlet airflow of the blades, which is not only beneficial to noise reduction, but also ensures that the dynamic pressure at the outlet of the centrifugal fan is not attenuated.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A noise reduction range hood, comprising

[0008] a range hood body;

[0009] a bellows, which is arranged in the range hood body;

[0010] a volute, the volute being arranged in the bellows;

[0011] and a motor, the output shaft of the motor being connected to an impeller, the impeller being located in the volute;

[0012] Features:

[0013] The impeller includes a baffle ring and a plurality of blades. The blades are evenly arranged in the same direction between two adjacent baffle rings. The side of the blade facing the rotation direction of the impeller is provided with serrations. The serrations are located in the middle of the blades. When the motor drives the impeller to rotate, the serrations are used to comb the airflow in the volute to reduce noise. Through the design of the above structure, it is possible to effectively avoid excessive concentration of the outlet airflow of the blades, which is not only beneficial to reducing noise, but also ensures that the dynamic pressure at the outlet of the centrifugal fan is not attenuated.

[0014] Furthermore, the sawtooth has an arc-shaped structure, the diameter of the sawtooth is L2, 3.5mm<L2<4mm, the root of the sawtooth has an arc-shaped structure, the diameter of the root is L1, 3.5mm<L1<4mm, the root of the tooth and the edge of the blade are provided with an arc chamfer, the radius of the arc chamfer is r, 1.5mm<r<2mm, the distance between the bottom end of the root of the tooth and the edge of the blade is H, 3.5mm<H<4mm, which is convenient for manufacturing and processing.

[0015] Furthermore, the retaining ring includes a first retaining ring, a second retaining ring and a reinforced retaining ring. The reinforced retaining ring is located between the first retaining ring and the second retaining ring. The first retaining ring, the second retaining ring and the reinforced retaining ring are concentric circles with each other. The blades are distributed between the first retaining ring and the reinforced retaining ring and between the reinforced retaining ring and the second retaining ring. Through the design of the reinforced retaining ring, the strength and stability of the entire impeller can be improved and the service life can be extended.

[0016] Furthermore, the volute includes a duct enclosure, which is provided with an air outlet, and the duct enclosure is provided with a plurality of first through holes, the first through holes being close to the air outlet, and a volute noise reduction component is provided in the duct enclosure, the volute noise reduction component covers the first through holes and is used for sound absorption and noise reduction, which can not only absorb sounds of some frequency bands, but also effectively reduce the noise of the duct.

[0017] Furthermore, the volute noise reduction assembly includes a volute honeycomb panel and a volute noise reduction plate. The volute noise reduction plate is connected to the duct enclosure plate through the volute honeycomb panel. A plurality of second through holes are provided on the volute honeycomb panel. The volute noise reduction plate is used to absorb noise. The volute honeycomb panel can improve the stability and reliability of the installation of the volute noise reduction plate.

[0018] Furthermore, the bellows includes a bellows body and a bellows noise reduction mechanism arranged on the inner wall of the bellows body. The bellows noise reduction mechanism is used to reduce the noise caused by the front and rear airflow of the bellows body. It can not only reduce the noise caused by the front and rear airflow of the bellows, but also help to reduce the overall noise of the range hood.

[0019] Furthermore, the bellows noise reduction mechanism includes a front air inlet noise reduction component and a rear air inlet noise reduction component, which are located on opposite sides of the bellows body and are used to respectively reduce the noise caused by the front and rear air flows, thereby improving the noise reduction effect of the bellows.

[0020] Furthermore, the front air inlet noise reduction component includes a bellows front air inlet honeycomb plate and a bellows front air inlet noise reduction plate. The bellows front air inlet noise reduction plate is connected to the bellows body through the bellows front air inlet honeycomb plate. The bellows front air inlet honeycomb plate improves the stability and reliability of the installation of the bellows front air inlet noise reduction plate.

[0021] Furthermore, the rear air inlet noise reduction component includes a bellows rear air inlet honeycomb panel and a bellows rear air inlet noise reduction plate. The bellows rear air inlet noise reduction plate is connected to the bellows body through the bellows rear air inlet honeycomb panel. The bellows rear air inlet honeycomb panel improves the stability and reliability of the installation of the bellows rear air inlet noise reduction plate.

[0022] Furthermore, the bellows front air inlet noise reduction plate, the bellows rear air inlet noise reduction plate and the volute noise reduction plate are all made of asbestos noise reduction plates, which is beneficial to sound absorption and noise reduction.

[0023] The present invention has the following beneficial effects due to the adoption of the above technical solution:

[0024] 1. The present invention can effectively prevent the outlet airflow of the blade from being too concentrated, which is not only conducive to reducing noise, but also ensures that the dynamic pressure at the outlet of the centrifugal fan is not attenuated.

[0025] 2. The present invention can not only absorb sounds in certain frequency bands, but also effectively reduce the noise in the air duct.

[0026] 3. The present invention can not only reduce the noise caused by the airflow before and after the bellows, but also help to reduce the overall noise of the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings:

[0028] Figure 1 This is a structural schematic diagram of a noise reduction range hood according to the present invention;

[0029] Figure 2 for Figure 1 Schematic diagram of the structure in the AA direction;

[0030] Figure 3 It is a schematic diagram of the disassembly of the motor, impeller, volute and bellows in the present invention;

[0031] Figure 4 It is a structural schematic diagram of the impeller in the present invention;

[0032] Figure 5 for Figure 4 A partial enlarged view of point Ⅰ in the middle;

[0033] Figure 6 It is a structural schematic diagram of the volute in the present invention;

[0034] Figure 7 An exploded view of the volute in the present invention;

[0035] Figure 8 An exploded view of the bellows in the present invention;

[0036] Fig. 9It is a structural schematic diagram of the honeycomb panel at the rear air inlet of the wind box in the present invention.

[0037] In the figure: 1- range hood body;

[0038] 2-volute; 201-air duct enclosure; 202-first mounting hole; 203-second mounting hole; 204-air outlet; 205-first through hole; 206-first volute honeycomb panel; 207-second volute honeycomb panel; 208-second through hole; 209-first volute noise reduction panel; 210-second volute noise reduction panel;

[0039] 3- bellows; 301- honeycomb plate at the rear air inlet of bellows; 302- noise reduction plate at the rear air inlet of bellows; 303- honeycomb plate at the front air inlet of bellows; 304- noise reduction plate at the front air inlet of bellows; 305- mesh;

[0040] 4- impeller; 401- first retaining ring; 402- second retaining ring; 403- reinforcing retaining ring; 404- blade; 405- connecting plate; 406- sawtooth;

[0041] 5- Motor. DETAILED DESCRIPTION

[0042] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only embodiments of a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0045] like Figures 1 to 9 As shown, a noise reduction range hood of the present invention comprises a range hood body 1, a bellows 3, a volute 2 and a motor 5.

[0046] The bellows 3 is disposed in the range hood body 1 .

[0047] The bellows 3 includes a bellows body and a bellows noise reduction mechanism arranged on the inner wall of the bellows body. The bellows noise reduction mechanism is used to reduce the noise caused by the front and rear airflow of the bellows body. It can not only reduce the noise caused by the front and rear airflow of the bellows 3, but also help to reduce the overall noise of the range hood.

[0048] The bellows noise reduction mechanism includes a front air inlet noise reduction component and a rear air inlet noise reduction component, which are located on opposite sides of the bellows body and are used to reduce the noise caused by the front and rear air flows respectively, thereby improving the noise reduction effect of the bellows 3.

[0049] The front air inlet noise reduction component includes a bellows front air inlet honeycomb plate 303 and a bellows front air inlet noise reduction plate 304. The bellows front air inlet noise reduction plate 304 is connected to the bellows body through the bellows front air inlet honeycomb plate 303. The bellows front air inlet honeycomb plate 303 improves the stability and reliability of the installation of the bellows front air inlet noise reduction plate 304.

[0050] The rear air inlet noise reduction component includes a bellows rear air inlet honeycomb panel 301 and a bellows rear air inlet noise reduction panel 302. The bellows rear air inlet noise reduction panel 302 is connected to the bellows body through the bellows rear air inlet honeycomb panel 301. The bellows rear air inlet honeycomb panel 301 improves the stability and reliability of the installation of the bellows rear air inlet noise reduction panel 302.

[0051] The bellows front air inlet noise reduction plate 304, the bellows rear air inlet noise reduction plate 302 and the volute noise reduction plate are all made of asbestos noise reduction plates, which is beneficial to sound absorption and noise reduction.

[0052] Meshes 305 are evenly arranged on the honeycomb plate 303 at the front air inlet of the wind box and the honeycomb plate 301 at the rear air inlet of the wind box.

[0053] The volute 2 is arranged in the bellows 3 .

[0054] The volute 2 includes an air duct enclosure 201, which is provided with an air outlet 204. The air duct enclosure 201 is provided with a plurality of first through holes 205, and the first through holes 205 are close to the air outlet 204. A volute noise reduction component is provided in the air duct enclosure 201, and the volute noise reduction component covers the first through holes 205 for sound absorption and noise reduction. It can not only absorb sounds of some frequency bands, but also effectively reduce the noise of the air duct.

[0055] The volute noise reduction assembly includes a volute honeycomb panel and a volute noise reduction plate. The volute noise reduction plate is connected to the duct enclosure 201 through the volute honeycomb panel. A plurality of second through holes 208 are provided on the volute honeycomb panel. The volute noise reduction plate is used to absorb noise. The volute honeycomb panel can improve the stability and reliability of the installation of the volute noise reduction plate.

[0056] A first mounting hole 202 and a second mounting hole 203 are respectively provided on opposite sides of the air duct enclosure 201 . The first mounting hole 202 is used for mounting the motor 5 , and the second mounting hole 203 is used for connecting the air box 3 .

[0057] The volute noise reduction plate includes a first volute noise reduction plate 209 and a second volute noise reduction plate 210, which are respectively used to cover the first through holes 205 on both sides.

[0058] The volute honeycomb panel includes a first volute honeycomb panel 206 and a second volute honeycomb panel 207. The first volute honeycomb panel 206 and the second volute honeycomb panel 207 are both provided with a plurality of second through holes 208, so that the airflow noise can enter the volute noise reduction panel through the second through holes 208 to reduce the noise of the air duct.

[0059] The output shaft of the motor 5 is connected to the impeller 4 , and the impeller 4 is located in the volute 2 .

[0060] The impeller 4 includes a retaining ring and a plurality of blades 404. The blades 404 are evenly arranged in the same direction between two adjacent retaining rings. The blades 404 are provided with saw teeth 406 on the side facing the rotation direction of the impeller 4. The saw teeth 406 are located in the middle of the blades 404. When the motor 5 drives the impeller 4 to rotate, the saw teeth 406 are used to comb the wind flow in the volute 2 to reduce noise.

[0061] The sawtooth 406 has an arc-shaped structure, and the diameter of the sawtooth 406 is L2, 3.5mm<L2<4mm. The root of the sawtooth 406 has an arc-shaped structure, and the diameter of the root is L1, 3.5mm<L1<4mm. The root of the tooth and the edge of the blade 404 are provided with an arc chamfer, and the radius of the arc chamfer is r, 1.5mm<r<2mm. The distance between the bottom end of the root of the tooth and the edge of the blade 404 is H, 3.5mm<H<4mm, which is convenient for manufacturing and processing.

[0062] The retaining ring includes a first retaining ring 401, a second retaining ring 402 and a reinforced retaining ring 403. The reinforced retaining ring 403 is located between the first retaining ring 401 and the second retaining ring 402. The first retaining ring 401, the second retaining ring 402 and the reinforced retaining ring 403 are concentric circles with each other. The blades 404 are distributed between the first retaining ring 401 and the reinforced retaining ring 403 and between the reinforced retaining ring 403 and the second retaining ring 402. Through the design of the reinforced retaining ring 403, the strength and stability of the entire impeller 4 can be improved and the service life can be extended.

[0063] It also includes a connecting disk 405, which is integrally formed with the reinforcing retaining ring 403, so as to facilitate manufacturing and processing.

[0064] The connecting disk 405 is provided with a sleeve and a through groove. The sleeve is vertically arranged at the center of the connecting disk 405. The through groove is distributed in a ring shape on the connecting disk 405. The sleeve is used to connect the output shaft of the motor 5. The through groove facilitates gas circulation and improves smoke exhaust efficiency.

[0065] The above structural design can effectively prevent the outlet airflow of the blade 404 from being too concentrated, which is not only beneficial to noise reduction, but also ensures that the dynamic pressure of the outlet 204 of the centrifugal fan is not attenuated.

[0066] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. A noise reduction range hood, comprising a range hood body; a bellows, the bellows being arranged in the range hood body; a volute, the volute being disposed in the bellows; and a motor, the output shaft of the motor being connected to an impeller, the impeller being located in the volute; Features: The impeller includes a retaining ring and a plurality of blades, wherein the blades are evenly arranged in the same direction between two adjacent retaining rings, and a sawtooth is provided on the side of the blade facing the rotation direction of the impeller, wherein the sawtooth is located in the middle of the blade, and when the motor drives the impeller to rotate, the sawtooth is used to comb the airflow in the volute to reduce noise.

2. The noise reduction range hood according to claim 1, characterized in that: The sawtooth has an arc-shaped structure, and the diameter of the sawtooth is L2, 3.5mm<L2<4mm. The root of the sawtooth has an arc-shaped structure, and the diameter of the root is L1, 3.5mm<L1<4mm. The root of the tooth and the edge of the blade are provided with an arc chamfer, and the radius of the arc chamfer is r, 1.5mm<r<2mm. The distance between the bottom end of the root of the tooth and the edge of the blade is H, 3.5mm<H<4mm.

3. The noise reduction range hood according to claim 1, characterized in that: The retaining ring includes a first retaining ring, a second retaining ring and a reinforcing retaining ring. The reinforcing retaining ring is located between the first retaining ring and the second retaining ring. The first retaining ring, the second retaining ring and the reinforcing retaining ring are concentric circles with each other. The blades are distributed between the first retaining ring and the reinforcing retaining ring, and between the reinforcing retaining ring and the second retaining ring.

4. The noise reduction range hood according to claim 1, characterized in that: The volute includes an air duct enclosure, an air outlet is provided on the air duct enclosure, a plurality of first through holes are provided on the air duct enclosure, the first through holes are close to the air outlet, a volute noise reduction component is provided in the air duct enclosure, and the volute noise reduction component covers the first through holes for sound absorption and noise reduction.

5. The noise reduction range hood according to claim 4, characterized in that: The volute noise reduction assembly includes a volute honeycomb panel and a volute noise reduction plate. The volute noise reduction plate is connected to the air duct enclosure plate through the volute honeycomb panel. A plurality of second through holes are provided on the volute honeycomb panel.

6. The noise reduction range hood according to claim 5, characterized in that: The bellows comprises a bellows body and a bellows noise reduction mechanism arranged on the inner wall of the bellows body, wherein the bellows noise reduction mechanism is used to reduce the noise caused by the front and rear airflows of the bellows body.

7. The noise reduction range hood according to claim 6, characterized in that: The bellows noise reduction mechanism comprises a front air inlet noise reduction component and a rear air inlet noise reduction component, and the front air inlet noise reduction component and the rear air inlet noise reduction component are located on opposite sides of the bellows body.

8. The noise reduction range hood according to claim 7, characterized in that: The front air inlet noise reduction component includes a bellows front air inlet honeycomb plate and a bellows front air inlet noise reduction plate, and the bellows front air inlet noise reduction plate is connected to the bellows body through the bellows front air inlet honeycomb plate.

9. The noise reduction range hood according to claim 8, characterized in that: The rear air inlet noise reduction component includes a bellows rear air inlet honeycomb plate and a bellows rear air inlet noise reduction plate, and the bellows rear air inlet noise reduction plate is connected to the bellows body through the bellows rear air inlet honeycomb plate.

10. The noise reduction range hood according to claim 9, characterized in that: The bellows front air inlet noise reduction plate, the bellows rear air inlet noise reduction plate and the volute noise reduction plate are all made of asbestos noise reduction plates.

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