A low-noise range hood

Abstract

This invention discloses a low-noise range hood, including a range hood body and a fan housing mounted on the range hood body. A sound-absorbing volute is fixedly installed inside the fan housing. The sound-absorbing volute includes a volute body and a damping layer on the inner wall of the volute body. Multiple baffles are mounted on the volute body, and these baffles are rotatably connected to the volute body via connecting components. A noise-reducing plate is installed inside the fan housing. An exhaust pipe is connected to the exhaust vent extending from the volute body to the outside of the fan housing. An oil fume filter plate is installed inside the exhaust pipe. This invention discloses a low-noise range hood that reduces noise while also filtering oil fumes.

Description

Technical Field

[0001] This invention patent relates to the field of range hood technology, specifically to a low-noise range hood. Background Technology

[0002] The cooking process in traditional Chinese cuisine includes frying, stir-frying, deep-frying, and roasting, which generates a lot of oil fumes. These fumes not only seriously pollute the kitchen environment, but also pose significant health risks to kitchen workers who are exposed to them for extended periods, potentially leading to cancer. Therefore, range hoods are widely used in kitchens; they are appliances used in home kitchens to remove oil fumes generated during cooking.

[0003] During the operation of a range hood, the fan inside the hood's casing works, drawing the interior into a negative pressure state. External fumes enter the casing under the pressure difference and are then discharged after passing through the fan's duct. The flow of fumes inside the casing is affected by changes in the flow cross-section, causing changes in velocity and leading to the formation of vortices. Furthermore, the direct collision between the fumes and the inner wall of the casing causes airflow pulsation. These vortices and pulsations not only generate significant noise pollution but also reduce the fan's efficiency in drawing and purifying the fumes inside the casing.

[0004] Existing noise reduction measures are ineffective, resulting in significant noise pollution from the operation of the wind turbines. Summary of the Invention

[0005] The purpose of this invention patent is to solve the problems in the prior art by providing a low-noise range hood, thereby addressing the technical problem that the noise reduction measures in the prior art are ineffective, resulting in still serious noise pollution from the operation of the fan.

[0006] To achieve the above objectives, the technical solution of this invention patent is as follows:

[0007] A low-noise range hood includes a range hood body and a fan housing mounted on the range hood body. A sound-absorbing volute is fixedly installed inside the fan housing. The sound-absorbing volute includes a volute body and a damping layer disposed on the inner wall of the volute body. Multiple baffles are disposed on the volute body, and the multiple baffles are rotatably connected to the volute body via connecting components. A noise reduction plate is disposed inside the fan housing. An exhaust pipe is connected to the air outlet extending from the volute body to the outside of the fan housing. An oil fume filter plate is disposed inside the exhaust pipe.

[0008] Preferably, the damping layer is bonded to the inner wall of the volute body, and the damping layer is a high-damping asphalt material damping layer.

[0009] Preferably, multiple baffles are arranged at the air inlet of the volute body, and the effective blocking height of each baffle at the air inlet of the volute body is not less than 1 / 3 of the effective radius of the air inlet of the volute body. The baffles are arranged at a downward inclination relative to the side of the air outlet of the volute body.

[0010] Preferably, the connecting assembly includes a connecting rod, a sleeve rotatably connected to the connecting rod, a baffle plate fixedly provided on the outer ring of the sleeve, springs fixedly provided laterally at both ends of the connecting rod, and movable sleeves sleeved around the connecting rod at the ends of the two springs furthest from the connecting rod. Vertically upward pull rods are provided on the outer rings of the two movable sleeves. Two parallel fixed rods are vertically arranged on the front of the volute body, and fixed sleeves are provided on the fixed rods. The two fixed sleeves are respectively sleeved on the movable sleeves.

[0011] Preferably, a fixing strip is provided axially at the center of the outer ring of the connecting rod, and the inner ring of the sleeve is provided with multiple slots for the fixing strip to engage.

[0012] Preferably, the exhaust pipe includes a first exhaust pipe communicating with the air outlet of the volute body, a bend pipe connected to the other end of the first exhaust pipe, a second exhaust pipe connected to the other end of the bend pipe, a first silencer provided at the end of the first exhaust pipe near the air outlet of the volute body, a second silencer provided at the end of the second exhaust pipe away from the bend pipe, a sound-absorbing layer adhered to the inner wall of the bend pipe, an oil fume filter plate provided at the top of the second exhaust pipe near the bend pipe, an oil collection trough provided at the bottom of the second exhaust pipe below the oil fume filter plate, an oil collection pipe passing through the bottom of the oil collection trough, an oil collection box connected to the end of the oil collection pipe extending outside the second exhaust pipe, and a T-shaped groove for inserting the oil collection box starting at the bottom of the second exhaust pipe.

[0013] Preferably, the fan cabinet is fixedly connected by four panels around its perimeter with screws. Each panel has a noise reduction plate fixed on the side closest to the volute body, and the noise reduction plate has multiple noise reduction holes.

[0014] Preferably, the sound-absorbing layer includes a foaming agent layer bonded to the inner wall of the bend, and sound-absorbing cotton is bonded to the side of the foaming agent layer away from the inner wall of the bend.

[0015] The beneficial effects of this invention patent are:

[0016] 1. This invention patent has multiple baffles set at the air inlet of the volute body. The baffles are inclined downward and are designed to be movable and detachable, which facilitates later maintenance and cleaning. At the same time, the baffles can rotate at multiple angles, so that the fumes can enter the volute body through two air ducts. This can improve the efficiency of the fan blades and reduce noise.

[0017] 2. This invention patent reduces radiated noise by setting a damping layer on the inner wall of the volute body, and the damping layer covers the entire inner wall of the volute body.

[0018] 3. This invention patent has noise reduction plates installed on the inner wall of the fan housing, which can greatly reduce the noise generated by the motor and fan blades when they run in the volute body.

[0019] 4. This invention patent has installed an oil fume filter plate at the connection between the second exhaust pipe and the bend, so that the emitted oil fumes can be filtered again, avoiding pollution of the external air environment.

[0020] 5. This invention patent has silencers at both ends of the exhaust pipe and a sound-absorbing layer inside the bend, thereby reducing the occurrence of eddies and pulsations caused by direct collision between the oil fume airflow and the exhaust pipe, effectively reducing noise pollution and improving user comfort. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention patent;

[0022] Figure 2 This is a schematic diagram of the installation structure of the air handling unit of this invention.

[0023] Figure 3 This is a schematic diagram of the structure of the volute shell of this invention patent;

[0024] Figure 4 This is a schematic diagram of the exhaust pipe of this invention patent;

[0025] Figure 5 This is a schematic diagram of the fixing component of the present invention:

[0026] Figure 6 This is a schematic diagram of the connection between the sleeve and the connecting rod in this invention patent.

[0027] Figure 7 This is a schematic diagram of the structure of the connection point of the oil fume filter plate in this invention patent;

[0028] Figure 8 This is a schematic diagram of the cross-sectional structure of the sound-absorbing layer of this invention. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] like Figure 1-8As shown, a low-noise range hood includes a range hood body 1 and a fan housing 2 mounted on the range hood body 1. A sound-absorbing volute 31 is fixedly installed inside the fan housing 2. The sound-absorbing volute 31 includes a volute body 34 and a damping layer 32 mounted on the inner wall of the volute body 34. Multiple baffles 33 are mounted on the volute body 34 and are rotatably connected to the volute body 34 via a connecting assembly 35. A noise reduction plate 22 is mounted inside the fan housing 2. An exhaust pipe 4 is connected to the exhaust vent extending from the volute body 34 to the outside of the fan housing 2. An oil fume filter plate 451 is mounted inside the exhaust pipe 4.

[0031] The damping layer 32 is bonded to the inner wall of the volute body 34, and the damping layer 32 is a high-damping asphalt material damping layer.

[0032] Multiple baffles 33 are installed at the air inlet of the volute body 34. The effective blocking height of each baffle 33 at the air inlet of the volute body 34 is not less than 1 / 3 of the effective radius of the air inlet of the volute body 34. The baffles 33 are inclined downward relative to the side of the air outlet of the volute body 34. During implementation, the baffles are inclined downward so that the fumes can enter the volute body through two air ducts. This can improve the efficiency of the fan blades and reduce noise.

[0033] The connecting assembly 35 includes a connecting rod 351, a sleeve 352 rotatably connected to the connecting rod 351, a baffle plate 33 fixedly installed on the outer ring of the sleeve, springs 357 horizontally fixed at both ends of the connecting rod 351, and movable sleeves 354 sleeved on the outside of the connecting rod 351 at the ends of the two springs 357 away from the connecting rod 351. Vertically upward pull rods 353 are installed on the outer rings of the two movable sleeves 354. Two parallel fixed rods 355 are vertically installed on the front of the volute body 34. Fixed sleeves 356 are installed on the fixed rods 355. The two fixed sleeves 356 are respectively sleeved on the movable sleeves 354. During implementation, the two pull rods 353 can be pulled to bring the two movable sleeves 354 closer together, thereby allowing the fixed sleeves 356 at both ends to be sleeved or detached, facilitating the disassembly and installation of the baffle plate 33 for cleaning.

[0034] A fixing strip 358 is axially arranged at the center of the outer ring of the connecting rod 351. The inner ring of the sleeve 352 has multiple slots 359 for the fixing strip 358 to engage. During implementation, the sleeve 352 is pulled to one side and rotated at the same time. After rotating to a certain angle, it engages with the fixing strip 358 through the slots 359, thereby achieving a fixing effect. This allows for convenient adjustment of the angle between the baffle 33 and the volute body 34 as needed.

[0035] The exhaust pipe 4 includes a first exhaust pipe 41 connected to the air outlet of the volute body 34. The other end of the first exhaust pipe 41 is connected to a bend pipe 44, and the other end of the bend pipe 44 is connected to a second exhaust pipe 45. A first silencer 42 is provided at the end of the first exhaust pipe 41 near the air outlet of the volute body 34, and a second silencer 46 is provided at the end of the second exhaust pipe 45 away from the bend pipe 44. A sound-absorbing layer 43 is bonded to the inner wall of the bend pipe 44. During implementation, this can reduce the occurrence of eddies and pulsations caused by direct collision between the oil fume airflow and the exhaust pipe, effectively reducing noise pollution and improving user comfort. An oil fume filter plate 451 is provided at the top of the second exhaust pipe 45 near the bend 44. An oil collection trough 452 is provided at the bottom of the second exhaust pipe 45 below the oil fume filter plate 451. An oil collection pipe 455 is provided at the bottom of the oil collection trough 452, passing through the bottom of the second exhaust pipe 45. An oil collection box 453 is connected to the end of the oil collection pipe 455 extending outside the second exhaust pipe 45. A T-shaped groove 454 for inserting the oil collection box 453 is provided at the bottom of the second exhaust pipe 45. During implementation, residual oil fumes can be filtered again by the oil fume filter plate 451 when passing through the second exhaust pipe 45, avoiding emission to the outside and causing air pollution. The filtered oil fumes can be collected by the oil collection box 453 for centralized treatment.

[0036] The air handling unit 2 is fixedly connected by four panels 21 around its perimeter with screws. Each panel 21 has a noise reduction plate 22 fixed on the side near the volute body 34. The noise reduction plate 22 has multiple noise reduction holes 23.

[0037] The sound-absorbing layer 43 includes a foaming agent layer 431 bonded to the inner wall of the bend 44, and a sound-absorbing cotton 432 is bonded to the side of the foaming agent layer 431 away from the inner wall of the bend 44.

[0038] When in use, the range hood is turned on, and the motor drives the fan blades to rotate, drawing the fumes into the volute housing within the fan unit. Multiple baffles are installed at the air inlet of the volute housing, and these baffles are designed for easy removal and can be adjusted at multiple angles, transforming the air inlet from a single duct into multiple ducts. This multi-duct entry of fumes into the volute housing improves fan efficiency and reduces noise. The fumes then enter the exhaust pipe through the exhaust outlet of the volute housing, where a fume filter is installed. This filter further filters the fumes emitted to the outside, preventing air pollution. A silencer is installed at the connection between the first exhaust pipe and the volute housing exhaust outlet, and a sound-absorbing layer is installed inside the bend in the pipe. This reduces direct collisions between the fume airflow and the exhaust pipe, minimizing the formation of eddies and pulsations, effectively reducing noise pollution and improving user comfort. This invention has a simple structure and convenient design. Noise-reducing features are incorporated at every part of the structure through which the fumes pass, greatly reducing noise pollution during operation and improving the comfort of cooking in the kitchen. At the same time, the fumes are filtered again before being discharged to the outside, preventing air pollution.

[0039] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A low-noise range hood, characterized in that: The range hood includes a main body (1) and a fan cabinet (2) installed on the main body (1). A sound-absorbing volute (31) is fixedly installed inside the fan cabinet (2). The sound-absorbing volute (31) includes a volute body (34) and a damping layer (32) installed on the inner wall of the volute body (34). Multiple baffles (33) are installed on the volute body (34). The multiple baffles (33) are rotatably connected to the volute body (34) through a connecting component (35). A noise reduction plate (22) is installed inside the fan cabinet (2). A smoke exhaust pipe (4) is connected to the air outlet of the volute body (34) extending to the outside of the fan cabinet (2). An oil fume filter plate (451) is installed inside the smoke exhaust pipe (4). Multiple baffles (33) are set at the air inlet of the volute body (34). The effective blocking height of each baffle (33) at the air inlet of the volute body (34) is not less than 1 / 3 of the effective radius of the air inlet of the volute body (34). The baffles (33) are set at a downward angle relative to the side of the air outlet of the volute body (34). The exhaust pipe (4) includes a first exhaust pipe (41) connected to the air outlet of the volute body (34), the other end of the first exhaust pipe (41) is connected to a bend pipe (44), the other end of the bend pipe (44) is connected to a second exhaust pipe (45), the first exhaust pipe (41) is provided with a first silencer (42) at the end near the air outlet of the volute body (34), and the second exhaust pipe (45) is provided with a second silencer (46) at the end away from the bend pipe (44). The inner wall of the bend pipe (44) is bonded with a sound-absorbing layer (43), and the second exhaust pipe (45) is connected to a second silencer (46). An oil fume filter plate (451) is provided at the top of the smoke pipe (45) near the bend (44). An oil collection trough (452) is provided at the bottom of the second smoke pipe (45) below the oil fume filter plate (451). An oil collection pipe (455) is provided at the bottom of the oil collection trough (452) that passes through the bottom of the second smoke pipe (45). An oil collection box (453) is connected to the end of the oil collection pipe (455) that extends to the outside of the second smoke pipe (45). A T-shaped groove (454) for inserting the oil collection box (453) is provided at the bottom of the second smoke pipe (45).

2. The low-noise range hood according to claim 1, characterized in that: The damping layer (32) is bonded to the inner wall of the volute body (34), and the damping layer (32) is a high-damping asphalt material damping layer.

3. The low-noise range hood according to claim 1, characterized in that: The connecting assembly (35) includes a connecting rod (351), a sleeve (352) is rotatably connected to the connecting rod (351), a baffle plate (33) is fixedly provided on the outer ring of the sleeve, springs (357) are fixedly provided laterally at both ends of the connecting rod (351), and movable sleeves (354) sleeved on the outside of the connecting rod (351) are provided at the ends of the two springs (357) away from the connecting rod (351). Vertically upward pull rods (353) are provided on the outer rings of the two movable sleeves (354). Two parallel fixed rods (355) are vertically provided on the front of the volute body (34), and fixed sleeves (356) are provided on the fixed rods (355). The two fixed sleeves (356) are respectively sleeved on the movable sleeves (354).

4. A low-noise range hood according to claim 3, characterized in that: A fixing strip (358) is provided axially at the center of the outer ring of the connecting rod (351), and a plurality of slots (359) are provided on the inner ring of the sleeve (352) for the fixing strip (358) to be engaged.

5. A low-noise range hood according to claim 1, characterized in that: The air handling unit (2) is fixedly connected by four panels (21) around its perimeter with screws. Each panel (21) has a noise reduction plate (22) fixed on the side near the volute body (34). The noise reduction plate (22) has multiple noise reduction holes (23).

6. A low-noise range hood according to claim 1, characterized in that: The sound-absorbing layer (43) includes a foaming agent layer (431) bonded to the inner wall of the bend (44), and sound-absorbing cotton (432) is bonded to the side of the foaming agent layer (431) away from the inner wall of the bend (44).

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