CN212777553U - Fume exhaust fan - Google Patents

Abstract

The utility model discloses a range hood relates to range hood technical field for reduce range hood when the air inlet, the noise at work of blade import end department in the impeller. The range hood comprises a frame and a fan assembly. Wherein, the fan subassembly is located in the frame. The fan assembly comprises a casing, an impeller and a driving piece, wherein the impeller is positioned in the casing, and the driving piece is used for driving the impeller to rotate. The impeller comprises a front ring, a rear ring and a plurality of blades, wherein the front ring and the rear ring are the same in size, and the axial leads of the front ring and the rear ring are overlapped. The plurality of blades are arranged between the front ring and the rear ring at intervals along the circumferential direction of the front ring. The upper end of the blade is connected with the front ring, the lower end of the blade is connected with the rear ring, a chamfer is arranged at the inlet end of the blade, and the chamfer is positioned at the upper end and the lower end of the blade.

Description

Fume exhaust fan

Technical Field

The utility model relates to a range hood technical field especially relates to a range hood.

Background

The range hood is an electric appliance for kitchen for purifying kitchen environment, is usually arranged above a kitchen range and can quickly exhaust oil fume generated during cooking. The range hood comprises a rack and a fan assembly positioned in the rack. The fan assembly comprises a casing, an impeller and a centrifugal fan for driving the impeller to rotate. When the range hood sucks oil smoke, the motor drives the impeller to rotate so as to convey air in the rack to the outside, so that a negative pressure area is formed in the rack. Cooking oil fumes can enter the machine frame under the suction of the negative pressure area, so that indoor air can be purified.

The impeller includes a front ring, a rear ring, and a plurality of blades disposed between the front ring and the rear ring. Referring to fig. 1, the blades are rectangular in shape and have an inlet end 2241, an outlet end 2242, an upper end 2243, and a lower end 2244. Upper end 2243 and lower extreme 2244 set up relatively, and upper end 2243 and preceding circle rigid coupling, lower extreme 2244 and back circle rigid coupling. The inlet end 2241 is disposed opposite the outlet end 2242, the inlet end 2241 and the outlet end 2242 are located between the upper end 2243 and the lower end 2244, and the inlet end 2241 is a side of the blade close to the axis of the impeller.

During rotation of the impeller, and referring to FIG. 1, a portion of the wind flow may flow along inlet end 2241 towards upper end 2243 and lower end 2244. When the wind flows to the junction of inlet end 2241 and upper/lower ends 2243/2244, the wind flow is diverted by the centrifugal action of the impeller, so that the wind flows along inlet end 2241 of the impeller toward upper/lower ends 2243/2244 of the impeller and out of the impeller along upper/lower ends 2243/2244 of the blades.

And because the contained angle between entrance point 2241 and upper end 2243/lower end 2244 is the right angle, consequently, the angle that the wind current turned between entrance point 2241 and upper end 2243/lower end 2244 is the right angle for can produce great vortex when wind current turns to upper end 2243/lower end 2244 from entrance point 2241, and then the noise of work when leading to the impeller is great.

Among the prior art, in order to reduce the operating noise of impeller, see fig. 2, through the exit end 2242 with the blade transform into and form the wave form cockscomb structure by a plurality of sawtooth, can reduce the operating noise when blade in the impeller goes out the wind. However, the prior art cannot reduce the noise generated by the vortex when the blade enters the wind.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a range hood, when reducing range hood inlet air, the noise at work that the import end department of blade produced in the impeller.

In order to achieve the purpose, the utility model provides a range hood. The range hood comprises a frame and a fan assembly. The fan subassembly is located in the frame, the fan subassembly includes casing, impeller and driving piece, the impeller is located in the casing, just the driving piece is used for the drive the impeller rotates.

The impeller comprises a front ring, a rear ring and a plurality of blades, the diameters of the front ring and the rear ring are the same, and the axial leads of the front ring and the rear ring are overlapped; the blades are arranged between the front ring and the rear ring at intervals along the circumferential direction of the front ring; the upper end of the blade is connected with the front ring, the lower end of the blade is connected with the rear ring, a chamfer is formed in the inlet end of the blade, and the chamfer is located at the upper end and/or the lower end of the blade.

Compared with the prior art, in the range hood that this novel provided, be equipped with the chamfer on the entrance point of blade, and the chamfer is located the upper end and the lower extreme of blade for the chamfer can lead to the air current that turns to upper end and lower extreme along the entrance point, makes the angle that turns to of air current be greater than 90, thereby reduces the vortex that the air current produced when turning to, and then when reducing range hood air inlet, the noise at work that the entrance end department of blade produced in the impeller.

Drawings

The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:

FIG. 1 is a schematic view illustrating a part of the wind flow on a blade when an impeller rotates in the prior art;

FIG. 2 is a schematic view of a prior art blade;

fig. 3 is a schematic structural diagram of a range hood in the related art.

Fig. 4 is a schematic structural diagram of an impeller in the range hood provided by the present application;

FIG. 5 is a longitudinal sectional view of an impeller of the range hood provided by the present application;

fig. 6 is a schematic structural diagram of a vane in the range hood provided by the present application;

fig. 7 is a schematic flow direction diagram of a part of wind flow on the blades when the impeller rotates in the range hood provided by the present application;

fig. 8 is a left side view of an impeller in the range hood provided by the application:

fig. 9 is a partially enlarged view of an impeller in the range hood provided by the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

The range hood is an electric appliance for kitchen for purifying kitchen environment. The exhaust ventilator is arranged above a kitchen range, and can rapidly exhaust waste gas combusted by the range and oil fume harmful to human bodies generated in the cooking process, thereby reducing indoor air pollution, purifying air and having the safety guarantee effects of gas defense and explosion prevention.

The process of the range hood for sucking the oil smoke completely follows the principle of air hydrodynamics: in two adjacent space regions, as long as there is a pressure difference, the gas flows from a place where the pressure is high to a place where the pressure is low. When the range hood is in a working state, air in the range hood is discharged outdoors, so that a negative pressure area is formed in the range hood, and the pressure difference between the negative pressure area and the surrounding area is large. At this time, the cooking fume is sucked into the range hood by the negative pressure region in the process of rising, so that the indoor air can be purified.

Based on this, as shown in fig. 3 to 9, the range hood includes a frame 100, a fan assembly 200, a smoke exhaust assembly and a smoke collecting hood 300.

The housing 100 has a hollow rectangular parallelepiped shape, and one side wall of the housing 100 is connected to a wall of a kitchen so that the housing 100 can be mounted on the wall of the kitchen.

The blower fan assembly 200 is used to draw air in the rack 100 to the outside, and a negative pressure region is formed in the rack 100. The fan assembly 200 includes a housing 210, an impeller 220 disposed within the housing 210, and a motor that drives the impeller 220 to rotate relative to the housing 210. The casing 210 is fixed on the inner wall of the rack 100, the casing 210 has an air outlet and two air inlets, the two air inlets of the casing 210 are disposed oppositely, and the two air inlets of the casing 210 are located at two ends of the axial line of the impeller 220.

The cigarette subassembly of going out includes connector and tobacco pipe. The connector is arranged on the upper end face of the rack 100, the lower end of the connector is located in the rack 100, and the lower end of the connector is communicated with the air outlet of the machine shell. The upper end of the connector is located outside the frame 100, and the upper end of the connector is connected with the smoke tube. One end of the smoke tube is connected with the connector, and the other end of the smoke tube can extend out of the kitchen from the wall of the kitchen, so that the air outlet of the casing can be communicated with the outside.

The fume collecting cover 300 is shaped like a funnel, and one end of the fume collecting cover 300 having a small area is connected to the frame 100, and the fume collecting cover 300 is communicated with the frame 200. The exhaust fume collecting cover 300 has an opening at one end having a large area. When the impeller 220 rotates at a high speed, the fume collecting cover 300 can contain the fume which cannot be collected and exhausted by the frame 100, so as to prevent a large amount of fume from overflowing and diffusing.

In the process of sucking oil smoke, the range hood controls the motor to drive the impeller 220 to rotate, so that the impeller 220 rotates to discharge air in the rack 100 to the outside through the smoke discharge assembly, and a negative pressure area is generated in the rack 100. The oil smoke can be sucked into the smoke collecting cover 300 by the negative pressure region and then enter the machine frame 100 through the smoke collecting cover 300.

The oil smoke in the rack 100 enters the casing through the two air inlets of the casing, and then enters the impeller 220 through the air inlet of the impeller 220. The oil smoke can rotate synchronously with the impeller 220, so that the oil smoke can be subjected to oil-gas separation under the centrifugal acting force of the rotation of the impeller 220. Grease particles are condensed into oil drops, and then are thrown out of the impeller 220 through gaps among the blades 224 and collected through an oil path. The cleaned flue gas moves through the inlet end 2241 of the vane 224 to the outlet end 2242 and is discharged out of the impeller 220. Meanwhile, part of the flue gas also flows along the inlet end 2241 of the impeller 220, and when the wind flow flows to the connection between the inlet end 2241 and the upper and lower ends 2243 and 2244, it is turned by the centrifugal action of the impeller 220, so that the wind flow flows out of the impeller 220 along the upper and lower ends 2243 and 2244 of the impeller 220.

Because the angles between inlet end 2241 and upper and lower ends 2243, 2244 are right angles, referring to fig. 1, the angle at which the wind flow changes direction between inlet end 2241 and upper and lower ends 2243, 2244 is right. At this time, when the wind flow is diverted from inlet end 2241 to upper end 2243 and lower end 2244, a large vortex flow is generated, which causes a large operating noise when blade 224 is induced, and further causes a large operating noise when impeller 220 is operated.

In order to reduce the air intake of the range hood, the inlet end 2241 of the blade 224 in the impeller 220 generates the working noise, the utility model provides a range hood. Fig. 3 shows a schematic structural diagram of the range hood, fig. 4 shows a schematic structural diagram of the impeller 220 in the range hood, and fig. 5 shows a longitudinal sectional view of the impeller 220 in the range hood. Fig. 6 shows a structural diagram of the vane 224 in the range hood. Referring to fig. 3 to 6, the range hood of the present invention includes a frame 100 and a fan assembly 200. The fan assembly 200 is disposed in the rack 100, the fan assembly 200 includes a housing 210, an impeller 220 and a driving member 230, the impeller 220 is disposed in the housing 210, and the driving member 230 is used for driving the impeller 220 to rotate. It should be noted that the casing 210 has an air inlet, and an extension line of the axial line of the impeller 220 passes through the air inlet.

The type of the driving assembly may be selected according to actual conditions, as long as the driving assembly can drive the impeller 220 to rotate. For example, the driving assembly may be a motor.

The impeller 220 includes a front ring 221, a rear ring 222, and a plurality of blades 224, the front ring 221 and the rear ring 222 have the same size, and the axial lines of the front ring 221 and the rear ring 222 coincide. The plurality of blades 224 are arranged between the front ring 221 and the rear ring 222 at intervals along the circumferential direction of the front ring 221, so that a gap capable of allowing oil smoke to pass through is left between any two adjacent blades 224. It should be understood that the plurality of blades 224 may be uniformly disposed between the front ring 221 and the rear ring 222 in the circumferential direction of the front ring 221, or may be non-uniformly distributed. However, in order to ensure a better smoke exhausting effect of the range hood, the plurality of blades 224 are uniformly arranged between the front ring 221 and the rear ring 222 along the circumferential direction of the front ring 221.

The upper end 2243 of the blade 224 is connected to the front ring 221, the lower end 2244 of the blade 224 is connected to the rear ring 2244, and the inlet end 2241 of the blade 224 is chamfered, and the chamfers are located at the upper end 2241 and the lower end 2242 of the blade. It should be understood that the chamfer may be a circular arc chamfer or a straight line chamfer.

It should be noted that the upper end 2243 of the blade 224 is disposed opposite to the lower end 2244 of the blade 224, the inlet end 2241 of the blade 224 is disposed opposite to the outlet end 2242 of the blade 224, and the inlet end 2241 and the outlet end 2242 are both located between the upper end 2243 and the lower end 2244, the inlet end 2241 is a side of the blade 224 close to the axial line of the impeller 220, and the outlet end 2242 is a side of the blade 224 far from the axial line of the impeller 220.

For example, the blades 224 may be rectangular in configuration.

In the process of sucking the oil smoke in the range hood, the driving part 230 drives the impeller 220 to rotate, and the impeller 220 sucks the air in the rack 100 to the outside, so that a negative pressure region is formed in the rack 100. The oil smoke can be sucked into the rack 100 by the negative pressure region, and then enter into the housing 210 through the air inlet of the housing 210.

The oil smoke in the impeller 220 can rotate synchronously with the impeller 220, so that the oil smoke can flow out of the impeller 220 after flowing from the inlet end 2241 of the blade 224 to the outlet end 2242 along the blade 224.

Meanwhile, part of the oil smoke flows from the inlet end 2241 of the blade 224, and is turned by the centrifugal action of the impeller 220 when part of the oil smoke flows to the connection between the inlet end 2241 and the upper and lower ends 2243 and 2244. At this time, the chamfer can guide the oil smoke, so that the oil smoke can flow out of the impeller 220 along the connecting side 2243.

The oil smoke flowing out of the impeller 220 can flow to the outside of the room through the smoke outlet assembly.

By the structure of above-mentioned range hood and range hood's the process of suction oil smoke, the utility model provides an among the range hood, be equipped with the chamfer on the blade 224, and the chamfer is located between connecting side 2243 and the entrance point 2241, see fig. 7, the chamfer can lead to the wind current that turns to along entrance point 2241 to upper end 2243 and lower extreme 2244 for the angle of turning to of wind current is greater than 90, can reduce the vortex that the wind current produced when turning to, and then can reduce the noise of operation when blade 224 advances wind.

As a possible implementation, see fig. 6, the chamfer is an arc chamfer. It should be understood that the arc-shaped chamfer can be a concave arc-shaped chamfer or a convex arc-shaped chamfer.

At this moment, relative and the chamfer of linear type, the utility model discloses in, the tangential direction of the convex chamfer of blade 224 is different for the tangential direction of the direction that the convex chamfer advances the direction of direction along with the arc chamfer changes to the wind, can further reduce the oil smoke and locate to form the swirl in the entrance point 2241 of blade 224, thereby further reduce the noise at the operating noise that blade 224 produced when the air inlet.

Illustratively, referring to fig. 3-9, the chamfer is a concave arc chamfer.

Specifically, in fig. 3 to 9, when the chamfer is a concave arc chamfer, the radian of the chamfer is 40 to 45 degrees, which can further increase the turning angle when the oil smoke turns from the inlet end 2241 to the connecting side 2243, further reduce the vortex generated when the blades 224 enter air, and further reduce the working noise when the blades 224 enter air.

The radius of the chamfer can be selected according to actual conditions, and for example, the radius of the chamfer is 10mm to 18 mm.

In fig. 3 to 9, the number of the plurality of blades 224 is 64 to 68. At this time, referring to table 1, as the number of the blades 224 in the impeller 220 is increased, the maximum static pressure of the range hood is increased, but when the number of the blades is too large, the friction loss of the impeller channel is increased, and the loss reduces the actual pressure and efficiency of the fan, the number of the blades 224 is 64 to 68, so that the range hood can have a large maximum static pressure, and the air draft intensity of the range hood is ensured.

TABLE 1 relationship table of the number of blades 224 and the maximum static pressure of the range hood

Number of blades 224	60	64	66	68
					Maximum static pressure (Pa)	392	398	406	405

Specifically, the number of the plurality of blades 224 is 66.

As a possible implementation manner, referring to fig. 3 to 9, the vane 224 is an arc-shaped vane 224, and the air inlet angle α of the vane 224 is 70 ° to 80 °. It should be noted that the air inlet angle of the vane 224 is the angle between the tangent line of the front ring 221 at the connection with the inlet end 2241 of the vane 224 and the inlet end 2241 of the vane 224.

Meanwhile, referring to fig. 3 to 9, the air outlet angle β of the blade 224 is 160 ° to 170 °. It should be understood that the wind outlet angle of the blade 224 is the angle between the tangent of the front ring 221 at the connection with the outlet end 2242 of the blade 224 and the outlet end 2242 of the blade 224. The change of the outlet angle has great influence on the performance of the fan, the larger the outlet angle is, the stronger the working capacity of the blade is, so that the air inlet volume of the impeller is increased. However, the outlet angle is large, the noise is increased, and vibration may be caused in special cases. At this time, referring to table 2, the air outlet angle β of the blade 224 is 160 ° to 170 °, so that the range hood can have sufficient maximum static pressure to generate sufficient air draft intensity, and further the effect of sucking the oil smoke of the range hood can be enhanced.

TABLE 2 relationship table between the air outlet angle of the blade 224 and the maximum static pressure of the range hood

Air-out angle (°)	160	165	170	175
					Air volume (m)3/min)	17.8	18.1	18.4	18.6
Noise (dB (a))	68	68.2	68.5	69

Specifically, the air outlet angle β of the blade 224 is 170 °.

As an embodiment, referring to fig. 3 to 9, the housing 210 is a volute, and the volute has two air inlets, and the two air inlets are respectively located at two ends of the axial line of the impeller 220.

The impeller 220 further comprises a middle disc 223, the middle disc 223 is coincident with the axial line of the front ring 221, and the diameter of the middle disc 223 is the same as that of the front ring 221. The middle disc 223 is located between the front ring 221 and the rear ring 222, the impeller 220 penetrates through the middle disc 223, the middle disc 223 divides the impeller 220 into a front wind guide part 2245 and a rear wind guide part 2246, the front wind guide part 2245 is located between the middle disc 223 and the front ring 221, and the rear wind guide part 2246 is located between the middle disc 223 and the rear ring 222.

The central disc 223 is provided with a sleeve engaged with the motor, so that an output shaft of the motor can be engaged with the central disc 223 to drive the central disc 223 to rotate, and further the motor can drive the impeller 220 to rotate.

At this time, the volute has two air inlets, and the impeller 220 has two air inlets, which can increase the air inlet area of the volute, so as to improve the oil smoke suction efficiency of the volute.

The middle disc 223 of the impeller 220 is located between the front ring 221 and the rear ring 222, so that the impeller 220 has two air inlets, and the two air inlets of the impeller 220 are the opening of the front ring 221 and the opening of the rear ring 222, respectively. Meanwhile, because the two air inlets of the volute are respectively located at the two ends of the axis of the impeller 220, the two air inlets of the volute are respectively opposite to the two air inlets of the impeller 220, and the smoke inlet efficiency of the oil smoke entering the impeller 220 can be improved.

When the volute is installed on the rack 100, the two air inlets of the volute are different from the rack 100 in distance, the distance between the air inlet of the volute, which is opposite to the air inlet of the rear ring 222 of the impeller 220, and the rack 100 is shorter, and the distance between the air inlet of the volute, which is opposite to the air inlet of the front ring 221 of the impeller 220, and the rack 100 is longer, so that the amount of oil smoke entering the impeller 220 from the air inlet of the front ring 221 of the impeller 220 is greater than the amount of oil smoke entering the impeller 220 from the air inlet of the rear ring 222 of the impeller 220. In this case, in order to improve the efficiency of the impeller 220 and increase the intake air amount of the impeller 220, referring to fig. 3 to 6, the length ratio of the front air guide part 2245 to the rear air guide part 2246 is 1.75 to 2. At this time, since the front air guide part 2245 is longer and the rear air guide part 2246 is shorter, the air volume processed by the front air guide part 2245 is larger than that of the rear air guide part 2246, so that the efficiency of the impeller 220 can be improved and the air intake of the range hood can be increased.

Specifically, the length ratio of the front air guide 2245 to the rear air guide 2246 is 2.

In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A range hood, comprising:

a frame;

the fan assembly is arranged in the rack and comprises a shell, an impeller and a driving piece, the impeller is positioned in the shell, and the driving piece is used for driving the impeller to rotate;

the impeller comprises a front ring, a rear ring and a plurality of blades, the diameter of the front ring is the same as that of the rear ring, and the axial leads of the front ring and the rear ring are overlapped; the blades are arranged between the front ring and the rear ring at intervals along the circumferential direction of the front ring; the upper end of the blade is connected with the front ring, the lower end of the blade is connected with the rear ring, a chamfer is formed in the inlet end of the blade, and the chamfer is located at the upper end and the lower end of the blade.

2. The range hood of claim 1, wherein the chamfer is a rounded chamfer.

3. The range hood of claim 2, wherein the chamfer is a concave arc chamfer.

4. The range hood of claim 2, wherein the arc of the chamfer is 40 ° to 45 °.

5. The range hood of claim 2, wherein the radius of the chamfer is 10mm to 18 mm.

6. The range hood of claim 1, wherein the number of the plurality of blades is 64-68.

7. The range hood of claim 1, wherein the vane is an arc-shaped vane, and the air inlet angle of the vane is 70 ° to 80 °, and the air outlet angle of the vane is 160 ° to 170 °.

8. The range hood of claim 1, wherein the housing is a volute, the volute has two air inlets, and the two air inlets are respectively located at two ends of an axial lead of the impeller;

the impeller also comprises a middle disc, the middle disc is superposed with the axial lead of the front ring, and the diameter of the middle disc is the same as that of the front ring; the central disc is located between the front ring and the rear ring, the impeller penetrates through the central disc, the central disc divides the impeller into a front air guiding part and a rear air guiding part, the front air guiding part is located between the central disc and the front ring, and the rear air guiding part is located between the central disc and the rear ring.

9. The range hood of claim 8, wherein the length ratio of the front air guiding part to the rear air guiding part is 1.75-2.

10. The range hood of claim 9, wherein the length ratio of the front air guiding portion to the rear air guiding portion is 2.

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