CN110822507B

CN110822507B - Volute for range hood, fan and range hood

Info

Publication number: CN110822507B
Application number: CN201810913899.4A
Authority: CN
Inventors: 宋祖龙; 蒋济武
Original assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Priority date: 2018-08-10
Filing date: 2018-08-10
Publication date: 2021-04-20
Anticipated expiration: 2038-08-10
Also published as: CN110822507A

Abstract

The invention discloses a volute, a fan and a range hood for the range hood, wherein the end face of the volute is provided with an air inlet, the peripheral surface of the volute is provided with an air outlet, an air passing cavity communicated with the air inlet and the air outlet is arranged in the volute, the end face of the volute is provided with a first sound absorption assembly arranged around the air inlet, and the first sound absorption assembly is provided with a first speed reduction surface which extends from the air outlet to the direction far away from the air outlet and outwards inclines relative to the transverse section of the volute. According to the volute for the range hood, the expansion flow channel with the flow area increased along the air inlet direction can be formed at the air inlet front end of the air inlet, so that the radiation noise outwards from the inside of the frame of the range hood can be effectively controlled.

Description

Volute for range hood, fan and range hood

Technical Field

The invention relates to the technical field of kitchen equipment, in particular to a volute for a range hood, a fan for the range hood with the volute and the range hood with the fan.

Background

The range hood in the related art is developing towards the direction of large air volume, large wind pressure and small noise (namely silence). Generally, the optimization of noise in the range hood has two modes of active noise reduction and passive noise reduction, and due to the factors of simple structure, low cost and the like, the passive noise reduction mode is applied more and more.

For example, a sound absorption dome is arranged in the frame to form a flow passage which is gradually reduced from bottom to top, so that the radiation noise at the air outlet of the volute is reflected downwards. However, the noise-reducing structure still has reflected noise, and the tapered flow passage forms a downward bell mouth facing the air suction port of the frame, so that the noise can be diffused outwards through the guide plate, and the noise is increased. For another example, a sound absorption module with the same cross-sectional area from top to bottom is arranged in the rack to form a flow channel with the constant flow area from top to bottom, and although the structure can weaken the outward radiation noise to a certain extent, the structure does not reasonably guide the radiation noise, and still has a part of noise radiating outward from the inside of the rack.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the volute for the range hood, and the volute for the range hood can effectively control the radiation noise outwards from the inside of the rack.

The invention also provides a fan for the range hood, which is provided with the volute for the range hood.

The invention also provides a range hood with the fan for the range hood.

According to the volute for the range hood disclosed by the embodiment of the first aspect of the invention, the end face of the volute is provided with the air inlet and the peripheral surface of the volute is provided with the air outlet, the volute is internally provided with the air passing cavity communicated with the air inlet and the air outlet, the end face of the volute is provided with the first sound absorption assembly arranged around the air inlet, and the first sound absorption assembly is provided with the first speed reduction surface which extends from the air outlet to the direction far away from the air outlet and outwards inclines relative to the transverse section of the volute.

According to the volute for the range hood, the expansion flow channel with the flow area increased along the air inlet direction can be formed at the air inlet front end of the air inlet, so that the radiation noise outwards from the inside of the frame of the range hood can be effectively controlled.

In addition, the volute for the range hood according to the embodiment of the invention also has the following additional technical characteristics:

according to some embodiments of the invention, the first decelerating surface is inclined at an angle α with respect to a transverse cross-section of the volute, 0 ° < α ≦ 5 °.

According to some embodiments of the invention, the first sound-absorbing member is further provided with a first accelerating surface connected to an edge of the first decelerating surface away from the air outlet, the first accelerating surface extending obliquely inward from the edge of the first decelerating surface in a direction away from the air outlet.

Advantageously, the first acceleration surface is configured as an arc surface or a plane surface.

According to some embodiments of the present invention, the first sound absorbing assembly is made of a sound absorbing material and is adhered to the volute, or a first sound absorbing cavity is defined between the first sound absorbing assembly and the volute, and the first sound absorbing assembly is provided with a plurality of first sound absorbing holes communicated with the first sound absorbing cavity.

According to some embodiments of the invention, the first sound absorbing assembly comprises: a first sound absorbing member made of a sound absorbing material; the first fairing is installed on the volute and covers the first sound absorbing piece, and is provided with a plurality of first sound absorbing holes to allow noise to pass through the first fairing.

Further, a first sound-deadening chamber is defined between the first sound-absorbing member and the inner surface of the first cowling, and the first sound-deadening chamber is communicated with the first sound-deadening hole.

According to some embodiments of the invention, the volute comprises: the air outlet is formed on the circumferential surface of the surrounding plate; first end plate and second end plate, first end plate with the second end plate is covered respectively and is established the axial both ends of bounding wall and with the bounding wall prescribes a limit to the air cavity jointly, the air inlet includes first air inlet and second air inlet, first air inlet is located first end plate just the second air inlet is located the second end plate, first subassembly of absorbing sound install in first end plate with any in the second end plate.

The fan for the range hood according to the embodiment of the second aspect of the invention comprises the volute for the range hood according to the embodiment of the first aspect of the invention.

According to the fan for the range hood provided by the embodiment of the invention, the volute for the range hood is utilized, and the expansion flow channel with the flow area increased along the air inlet direction can be formed at the air inlet front end of the air inlet, so that the radiation noise outwards from the inside of the frame of the range hood can be effectively controlled.

According to the third aspect embodiment of the invention, the range hood comprises: a frame having an air intake port and an air exhaust port; according to the fan for the range hood disclosed by the embodiment of the second aspect of the invention, the volute is arranged in the rack and positioned between the air suction port and the air exhaust port, the air outlet is communicated with the air exhaust port, the first decelerating surface and the inner wall of the rack jointly define an expanding flow channel, the expanding flow channel is communicated with the air passing cavity and the air suction port, and the flow area is increased along the air inlet direction from the air suction port to the air passing cavity; the second inhales the sound subassembly, the second inhales the sound subassembly and establishes the frame on the inner wall.

According to the range hood provided by the embodiment of the invention, the fan for the range hood can be used for effectively controlling the radiation noise outwards from the inside of the rack.

According to some embodiments of the invention, the second sound absorbing assembly has an expanding surface disposed toward the air inlet, a distance between the expanding surface and the end surface of the volute increasing in the air intake direction.

Further, the diverging surface includes at least one of a second decelerating surface extending obliquely outward in the air intake direction and a rectifying surface having a constant distance from the inner wall of the housing in the air intake direction.

Optionally, a second acceleration surface is arranged in the machine frame, the second acceleration surface is connected with the edge, adjacent to the suction port, of the second deceleration surface, and the second acceleration surface extends obliquely inwards along the air intake direction to define a contraction flow channel communicating the expansion flow channel and the suction port together with the volute.

Advantageously, the edge of the second decelerating surface adjacent to the suction port is closer to the suction port than the inlet port, and the edge of the second accelerating surface remote from the suction port is located at the bottom of the scroll casing in the air intake direction.

In some embodiments of the invention, the diverging face comprises the second decelerating face and the rectifying face, the rectifying face being located between the second decelerating face and the second accelerating face.

In some embodiments of the invention, the rectifying surface is a plurality of rectifying surfaces, and a distance between the plurality of rectifying surfaces and the inner wall of the rack decreases in a step shape along the air intake direction.

Advantageously, the included angle between the tangent plane at any point on the second decelerating surface and the inner wall of the frame is beta, and beta is more than 0 degree and less than or equal to 5 degrees.

According to some embodiments of the invention, a distance between a surface of the second sound-absorbing member facing the air intake and the inner wall of the housing is constant in the air intake direction or extends obliquely inward in the air intake direction.

According to some embodiments of the present invention, the second sound absorbing member is made of a sound absorbing material and is bonded to the frame, or a second sound absorbing chamber is defined between the second sound absorbing member and the frame, and the second sound absorbing member is provided with a plurality of second sound absorbing holes communicating with the second sound absorbing chamber.

According to some embodiments of the invention, the second sound absorbing assembly comprises: a second sound-absorbing member made of a sound-absorbing material; the second fairing, the second fairing install in frame and cover are established the sound piece is inhaled to the second, the second fairing is equipped with a plurality of second bloops so as to allow the noise to pass the second fairing.

Further, a second sound-deadening chamber is defined between the second sound-absorbing member and the inner surface of the second cowling, and the second sound-deadening chamber is communicated with the second sound-deadening hole.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic structural diagram of a range hood according to an embodiment of the invention;

FIG. 2 is a cross-sectional view of a range hood according to an embodiment of the present invention;

fig. 3 is a perspective view of a fan for a range hood according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a fan for a range hood according to an embodiment of the invention;

fig. 5 is a sectional view of a fan for a range hood according to an embodiment of the present invention;

FIG. 6 is a perspective view of a second sound absorbing assembly according to a first alternative embodiment of the present invention;

FIG. 7 is an exploded view of a second sound absorbing assembly according to a first alternative embodiment of the present invention;

FIG. 8 is a schematic structural view of a second sound absorbing assembly according to a first alternative embodiment of the present invention;

FIG. 9 is a cross-sectional view taken along line A-A of FIG. 8;

FIG. 10 is a cross-sectional view of a second sound absorbing assembly according to a second alternative embodiment of the present invention;

fig. 11 is a cross-sectional view of a second sound absorbing assembly according to a third alternative embodiment of the present invention.

Reference numerals:

a range hood 1 is provided,

a frame 100, an air inlet 101, an air outlet 102, a first inner wall 103, a second inner wall 104,

the fan 200, the scroll 210, the shroud 211, the air outlet 212, the first end plate 213, the second end plate 214, the first air inlet 215, the second air inlet 216, the first sound absorbing member 220, the first decelerating surface 221, the first accelerating surface 222, the first sound absorbing member 223, the first cowling 224, the first muffling hole 225,

the sound absorbing structure includes a second sound absorbing member 300, a second sound absorbing member 301, a second cowling 302, a second sound deadening hole 303, an expanding surface 310, a second decelerating surface 311, a rectifying surface 312, and a second accelerating surface 320.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

A volute 210 for a range hood according to an embodiment of the first aspect of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1 to 5, according to the scroll 210 for the range hood of the embodiment of the present invention, an end surface of the scroll 210 has an air inlet and a peripheral surface has an air outlet 212, and a gas passing chamber communicating the air inlet and the air outlet 212 is disposed in the scroll 210. The end surface of the volute 210 is provided with a first sound absorption component 220 arranged around the air inlet, the first sound absorption component 220 is provided with a first decelerating surface 221, and the first decelerating surface 221 extends from the air outlet 212 to a direction far away from the air outlet 212 (i.e. from top to bottom) and outwards slantwise relative to the transverse cross section of the volute 210. Here, "outward" refers to a direction away from the center of the volute 210, and similarly, "inward" refers to a direction toward the center of the volute 210.

Therefore, according to the volute 210 for the range hood of the embodiment of the invention, when the volute is installed in the rack, the distance between the first decelerating surface 221 and the inner wall of the rack increases along the air intake direction (from bottom to top) from the air suction port of the rack to the air passing chamber, that is, an expanding flow channel is formed at the air intake front end of the air inlet, and the flow area of the expanding flow channel increases along the air intake direction, so that the radiation noise outwards from the inside of the rack of the range hood can be effectively controlled.

According to some embodiments of the present invention, an inclination angle of the first decelerating surface 221 with respect to a transverse cross-section of the volute 210 is α, and in order to avoid that a flow area is too small due to too large α and the overall flow rate of the range hood is affected, α needs to be controlled within a certain range, where α is greater than 0 ° and less than or equal to 5 °.

According to some embodiments of the present invention, as shown in fig. 1 to 5, the first sound-absorbing assembly 220 is further provided with a first accelerating surface 222, the first accelerating surface 222 is connected to an edge (i.e. a lower edge) of the first decelerating surface 221 away from the air outlet 212, and the first accelerating surface 222 extends from the lower edge of the first decelerating surface 221 towards a direction away from the air outlet 212 (i.e. downwards) and obliquely inwards, so that the ascending airflow forms a coanda effect of wall-attached flow on the surface of the first sound-absorbing assembly 220, which is beneficial to reducing the loss caused by the ascending airflow inside the rack impacting the bottom of the volute 210.

Advantageously, as shown in fig. 1-5, the first accelerating surface 222 is configured as an arc-shaped surface, thereby further facilitating reduction of air flow loss; of course, the first acceleration surface 222 can also be designed as a plane surface. Wherein the first acceleration surface 222 is located below the air inlet.

According to some embodiments of the present invention, the first sound absorbing assembly 220 is made of a sound absorbing material, and the first sound absorbing assembly 220 is adhered to the scroll 210, and the surface thereof may be covered with a thin film, so as to prevent oil contamination.

Alternatively, a first sound absorbing chamber is defined between the first sound absorbing assembly 220 and the scroll 210, and the first sound absorbing assembly 220 is provided with a plurality of first sound absorbing holes communicated with the first sound absorbing chamber. A plurality of first sound absorbing holes are distributed on the first decelerating surface 221 and the first accelerating surface 222, so that a helmholtz resonant cavity is formed between the first sound absorbing assembly 220 and the volute 210, noise in a specific frequency band can be eliminated, the effects of rectifying and emitting noise are achieved, and the noise is sealed inside the rack. For example, the first sound absorbing hole has a hole diameter of 1mm to 10mm, so that the sound absorbing effect is good. The first sound absorbing assembly 220 may be fixedly connected to the volute 210, or may be integrally formed with the volute 210.

According to some embodiments of the present invention, as shown in fig. 1-5, the first sound absorbing assembly 220 includes: a first sound-absorbing member 223 and a first cowling 224. The first sound-absorbing member 223 is made of a sound-absorbing material. The first cowling 224 is installed on the scroll 210 and covers the first sound absorbing member 223, and the first cowling 224 may protect and fix the first sound absorbing member 223. Wherein, the first fairing 224 is provided with a plurality of first muffling holes 225, and the plurality of first muffling holes 225 are distributed on the first decelerating surface 221 and the first accelerating surface 222, so that noise can be better muffled by the sound-absorbing material through the first fairing 224. For example, the first sound-deadening hole 225 has a hole diameter of 1mm to 10mm, so that the sound-absorbing effect is good.

Further, a first sound-deadening chamber is defined between the first sound-absorbing member 223 and the inner surface of the first cowling 224, and the first sound-deadening chamber communicates with the first sound-deadening hole 225. In this way, it is possible to attenuate noise in a specific frequency band, thereby enabling better noise control in cooperation with the first sound absorbing member 223.

According to some embodiments of the present invention, as shown in fig. 1-5, the volute 210 comprises: a shroud 211, a first end plate 213, and a second end plate 214. The air outlet 212 is formed in the circumferential surface of the shroud 211. The first end plate 213 and the second end plate 214 respectively cover the two axial ends of the shroud 211, the first end plate 213 is located at the front side of the second end plate 214, the first end plate 213, the second end plate 214 and the shroud 211 jointly define a gas passing cavity, the gas inlet comprises a first gas inlet 215 and a second gas inlet 216, the first gas inlet 215 is arranged on the first end plate 213, the second gas inlet 216 is arranged on the second end plate 214, and the first sound absorbing component 220 is mounted on any one of the first end plate 213 and the second end plate 214.

Here, the first sound absorbing member 220 may be provided on the first end plate 213 or the second end plate 214, or a plurality of first sound absorbing members 220 may be provided on the first end plate 213 and the second end plate 214, respectively, which is not particularly limited in the present invention. Wherein the second end plate 214 is adapted to mount a drive member, such as an electric motor.

As shown in fig. 1 to 5, a fan 200 for a range hood according to an embodiment of the second aspect of the present invention includes a volute 210 for a range hood according to an embodiment of the first aspect of the present invention.

According to the fan 200 for the range hood of the embodiment of the invention, by using the volute 210 for the range hood as described above, an expanded flow channel with a flow area increasing along the air inlet direction can be formed at the air inlet front end of the air inlet, so that the radiation noise outwards from the inside of the frame of the range hood can be effectively controlled.

As shown in fig. 1 to 11, a range hood 1 according to an embodiment of the third aspect of the present invention includes: a frame 100, a fan 200 for a range hood according to an embodiment of the second aspect of the present invention, and a second sound absorbing assembly 300.

Specifically, the rack 100 is placed vertically (i.e., in the up-down direction), the rack 100 has a suction port 101 and an exhaust port 102, and the exhaust port 102 is located above the suction port 101. The volute 210 is vertically disposed within the housing 100, i.e., the central axis of the volute 210 is oriented in a horizontal direction. Here, the volute 210 may be placed front to back, left to right, or offset. "placed front-to-back" means that the center axis of the volute 210 is oriented in the front-to-rear direction, "placed left-to-right" means that the center axis of the volute 210 is oriented in the left-to-right direction, "placed off-set" means that the center axis of the volute 210 is inclined with respect to both the front-to-rear direction and the left-to-right direction.

The volute 210 is located between the air inlet 101 and the air outlet 102, the air outlet 212 is communicated with the air outlet 102, the first decelerating surface 221 and the inner wall of the rack 100 jointly define an expanding flow channel, the expanding flow channel is connected with the air cavity and the air inlet 101, and the flow area is increased along the air inlet direction (namely the direction from bottom to top) from the air inlet 101 to the air cavity.

The second sound-absorbing member 300 is provided on an inner wall of the rack 100 including the first inner wall 103 and the second inner wall 104 which are oppositely disposed, for example, the first inner wall 103 is located at a front side of the second inner wall 104. Thus, the second sound-absorbing assembly 300 is provided on the first inner wall 103 of the rack 100 and/or on the second inner wall 104 of the rack 100. In other words, the second sound-absorbing member 300 is located inside the rack 100, and the second sound-absorbing member 300 may be provided on the first inner wall 103 of the rack 100, or the second sound-absorbing member 300 may be provided on the second inner wall 104 of the rack 100, or the second sound-absorbing member 300 may be provided in plurality, and the plurality of second sound-absorbing members 300 are provided on the first inner wall 103 and the second inner wall 104 of the rack 100, respectively.

Therefore, according to the range hood 1 of the embodiment of the present invention, during operation, the smoke is sucked into the expanding flow channel from the air suction port 101, passes through the expanding flow channel and enters the air passing cavity, and finally the smoke is discharged from the air outlet 212 and the air outlet 102. The expanded flow channel with the flow area increased along the air inlet direction is formed at the front end of the air inlet passing through the air cavity, so that the radiation noise outwards from the inside of the machine frame 100 can be effectively controlled. Here, "outward" refers to a direction away from the center of the rack 100, and similarly, "inward" refers to a direction toward the center of the rack 100.

According to some embodiments of the present invention, as shown in fig. 6 to 11, the second sound-absorbing assembly 300 has an expanding surface 310 disposed toward the air inlet, and a distance between the expanding surface 310 and an end surface of the scroll 210 increases in an air inlet direction, that is, a distance between the expanding surface 310 and the inner wall of the rack 100 decreases from bottom to top, thereby facilitating noise control.

Here, the "decrease" may be a gradual decrease or an intermittent decrease, and the present invention is not particularly limited thereto. For example, the diverging surface 310 includes at least one of a second decelerating surface 311 and a rectifying surface 312: as shown in fig. 11, the diverging surface 310 includes a second decelerating surface 311, the second decelerating surface 311 extends obliquely outward in the air intake direction (i.e., from bottom to top), and the second decelerating surface 311 may be formed of at least one of a flat surface and a curved surface. For example, the second decelerating surface 311 is a slanted plane or a curved surface such that the distance between the expanding surface 310 and the inner wall of the rack 100 gradually decreases from bottom to top; for another example, the second decelerating surface 311 is formed by a plurality of sections of planes with different inclination angles or a plurality of sections of curved surfaces with different curvatures; for another example, the second decelerating surface 311 is formed by a slanted plane and a curved surface. The present invention is not limited thereto.

Alternatively, as shown in fig. 6 to 11, a second acceleration surface 320 is provided in the frame 100, the second acceleration surface 320 is connected to a rim (i.e., a lower rim) of the second deceleration surface 311 adjacent to the suction port 101, and the second acceleration surface 320 extends obliquely inward in the air intake direction to define a converging flow passage together with the scroll 210, and the converging flow passage communicates the diverging flow passage and the suction port 101. Like this, the flow area of shrink runner reduces from bottom to top, and shrink runner and expansion runner constitute jointly and follow the runner that intake direction flow area reduces earlier the increase to can avoid the flue gas to reduce by the air current that flow area sudden change leads to when entering the expansion runner by induction port 101, noise increase, noise control better.

The second accelerating surface 320 may be formed on the second sound-absorbing member 300 or may be formed by extending the inner wall portion of the housing 100 obliquely. Wherein the second acceleration surface 320 may be formed of at least one of a flat surface and a curved surface. For example, the second acceleration surface 320 is an inclined plane or a curved surface, i.e., the flow area of the constricted flow passage gradually decreases from bottom to top; for another example, the second acceleration surface 320 is formed by a plurality of planes with different inclination angles or a plurality of curved surfaces with different curvatures; for another example, the second acceleration surface 320 is formed by a combination of an inclined plane and a curved surface. The present invention is not particularly limited in this regard.

Advantageously, as shown in fig. 6 to 11, the edge (i.e., the lower edge) of the second decelerating surface 311 adjacent to the suction port 101 is closer to the suction port 101 than the intake port, that is, the lower edge of the second decelerating surface 311 is located below the intake port, and the edge (i.e., the upper edge) of the second accelerating surface 320 far from the suction port 101 is located at the bottom of the scroll 210 in the intake direction, so that the sound deadening effect is better.

In some embodiments of the present invention, as shown in fig. 11, the expanding surface 310 includes a plurality of rectifying surfaces 312, each rectifying surface 312 is disposed perpendicular to the central axis of the volute 210 and the distance between the plurality of rectifying surfaces 312 and the inner wall of the rack 100 is constant along the air inlet direction, and the distance between the plurality of rectifying surfaces 312 and the inner wall of the rack 100 is reduced in a step shape along the air inlet direction, so that the distance between the expanding surface 310 and the inner wall of the rack 100 is intermittently reduced from bottom to top, that is, the flow area of the expanding flow channel is abruptly changed at the connection position of two adjacent rectifying surfaces 312. In this way, an expanding sound-deadening cavity with an abrupt cross-section is formed between the second sound-absorbing assembly 300 and the volute 210. Wherein, the position that above-mentioned sudden change takes place for the first time is located the below of air inlet in the direction of admitting air to guarantee the noise cancelling effect.

In some embodiments of the present invention, as shown in fig. 10, the diverging surface 310 may further include a second decelerating surface 311 and a rectifying surface 312, and the rectifying surface 312 is located between the second decelerating surface 311 and the second accelerating surface 320, that is, the rectifying surface 312 is located below the second decelerating surface 311. Therefore, the change of the flow area of the flow channel is gentle, and the noise is small.

Advantageously, an included angle between a tangent plane at any point on the second decelerating surface 311 and the inner wall of the rack 100 is β, and in order to avoid that a flow area is too small due to too large β and the overall flow rate of the range hood 1 is affected, β needs to be controlled within a certain range, and β is greater than 0 ° and less than or equal to 5 °.

According to some embodiments of the present invention, as shown in fig. 1, a distance between a surface of the second sound-absorbing member 300 facing the air intake and the inner wall of the rack 100 is constant in the air intake direction, that is, a longitudinal section of the second sound-absorbing member 300 is of a uniform sectional design in the up-down direction. Alternatively, the distance between the surface of the second sound-absorbing member 300 facing the air intake and the inner wall of the housing 100 may extend obliquely inward in the air intake direction.

According to some embodiments of the present invention, the second sound-absorbing member 300 is made of a sound-absorbing material, and the second sound-absorbing member 300 is adhered to the frame 100, and the surface thereof may be covered with a thin film, so as to prevent oil from being soaked.

Alternatively, a second sound absorbing cavity is defined between the second sound absorbing member 300 and the rack 100, and the second sound absorbing member 300 is provided with a plurality of second sound absorbing holes communicating with the second sound absorbing cavity. The plurality of second sound absorbing holes are distributed on the second decelerating surface 311 and the second accelerating surface 320, so that a helmholtz resonant cavity is formed between the second sound absorbing assembly 300 and the rack 100, noise in a specific frequency band can be eliminated, the effects of rectifying and emitting noise are achieved, and the noise is sealed inside the rack 100. For example, the aperture of the second sound absorption hole is 1mm-10mm, so that the sound absorption effect is good. The second sound-absorbing assembly 300 may be fixedly connected to the frame 100, or may be integrally formed with the frame 100.

According to some embodiments of the invention, as shown in fig. 6-11, the second sound absorbing assembly 300 comprises: a second sound absorbing member 301 and a second cowling 302. The second sound-absorbing member 301 is made of a sound-absorbing material. The second cowling 302 is mounted to the rack 100 and covers the second sound absorbing member 301, and the second cowling 302 can protect and fix the second sound absorbing member 301. The second cowling 302 is provided with a plurality of second muffling holes 303, and the plurality of second muffling holes 303 are distributed on the second decelerating surface 311 and the second accelerating surface 320, so that noise can better pass through the second cowling 302 and be muffled by a sound absorbing material. For example, the second muffling hole 303 has a hole diameter of 1mm to 10mm, so that the sound absorption effect is good.

Further, a second sound-deadening cavity is defined between the second sound-absorbing member 301 and the inner surface of the second cowling 302, and the second sound-deadening cavity is communicated with the second sound-deadening hole 303, so that the noise in a specific frequency band can be weakened, and the noise can be better controlled by matching with the second sound-absorbing member 301.

Other constructions and operations of the extractor hood 1 according to an embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "bottom," "inner," "outer," "axial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second", "third" 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, features defined as "first", "second", "third" may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, "a first feature" or "a second feature" may include one or more of the features, and the first feature "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact with each other through another feature therebetween. The first feature being "on," "over" and "above" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature.

It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "a specific embodiment," "an example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. The utility model provides a spiral case for range hood, its characterized in that, the terminal surface of spiral case has the air inlet and global has the gas outlet, be equipped with the intercommunication in the spiral case the air inlet with the gas passing chamber of gas outlet, the terminal surface of spiral case be equipped with around the first sound subassembly of inhaling that the air inlet set up, first sound subassembly of inhaling be equipped with by gas outlet department is towards keeping away from the direction of gas outlet and outwards for the first speed reduction face of the horizontal cross-section slope extension of spiral case.

2. The volute for a range hood according to claim 1, wherein the first decelerating surface has an inclination angle α with respect to a transverse cross-section of the volute, wherein α is greater than 0 ° and less than or equal to 5 °.

3. The volute for the range hood according to claim 1, wherein the first sound absorbing assembly further comprises a first accelerating surface, the first accelerating surface is connected to an edge of the first decelerating surface, the edge is away from the air outlet, and the first accelerating surface extends from the edge of the first decelerating surface towards a direction away from the air outlet and is inclined inward.

4. The volute for use in a range hood of claim 3, wherein the first acceleration surface is configured as an arcuate surface or a flat surface.

5. The volute for a range hood of claim 1, wherein the first sound absorbing assembly is made of a sound absorbing material and is bonded to the volute, or,

the first sound absorbing assembly and the volute define a first sound absorbing cavity therebetween, and the first sound absorbing assembly is provided with a plurality of first sound absorbing holes communicated with the first sound absorbing cavity.

6. The volute for a range hood of claim 1, wherein the first sound absorption assembly comprises:

a first sound absorbing member made of a sound absorbing material;

the first fairing is installed on the volute and covers the first sound absorbing piece, and is provided with a plurality of first sound absorbing holes to allow noise to pass through the first fairing.

7. The volute for a range hood of claim 6, wherein the first sound absorbing member and the inner surface of the first cowling define a first sound damping chamber therebetween, the first sound damping chamber being in communication with the first sound damping hole.

8. The volute for a range hood according to any of claims 1-7, wherein the volute comprises:

the air outlet is formed on the circumferential surface of the surrounding plate;

first end plate and second end plate, first end plate with the second end plate is covered respectively and is established the axial both ends of bounding wall and with the bounding wall prescribes a limit to the air cavity jointly, the air inlet includes first air inlet and second air inlet, first air inlet is located first end plate just the second air inlet is located the second end plate, first subassembly of absorbing sound install in first end plate with any in the second end plate.

9. A fan for a range hood, comprising a volute for a range hood according to any one of claims 1-8.

10. A range hood, comprising:

a frame having an air intake port and an air exhaust port;

the blower for a range hood according to claim 9, wherein the volute is disposed in the frame and located between the suction port and the exhaust port, the air outlet is communicated with the exhaust port, the first decelerating surface and the inner wall of the frame jointly define an expanding flow channel, the expanding flow channel is communicated with the air passing chamber and the suction port, and the flow area increases along an air intake direction from the suction port to the air passing chamber;

the second inhales the sound subassembly, the second inhales the sound subassembly and establishes the frame on the inner wall.

11. The range hood of claim 10, wherein the second sound absorbing assembly has an expansion surface disposed toward the air inlet, and a distance between the expansion surface and the end surface of the volute increases in the air intake direction.

12. The range hood of claim 11, wherein the diverging surface comprises at least one of a second decelerating surface and a rectifying surface, the second decelerating surface extending obliquely outward in the air intake direction, and a distance between the rectifying surface and the inner wall of the housing is constant in the air intake direction.

13. The range hood of claim 12, wherein a second acceleration surface is disposed in the housing, the second acceleration surface is connected to a rim of the second deceleration surface adjacent to the suction opening, and the second acceleration surface extends obliquely inward along the air intake direction to define a converging flow path with the volute to communicate the diverging flow path and the suction opening.

14. The range hood of claim 13, wherein the edge of the second decelerating surface adjacent to the suction opening is closer to the suction opening than the air inlet, and the edge of the second accelerating surface away from the suction opening is located at the bottom of the volute in the air intake direction.

15. The range hood of claim 13, wherein the diverging surface comprises the second decelerating surface and the rectifying surface, and the rectifying surface is located between the second decelerating surface and the second accelerating surface.

16. The range hood of claim 12, wherein the plurality of flow straightening surfaces are arranged, and the distance between the plurality of flow straightening surfaces and the inner wall of the rack decreases in a stepped manner along the air inlet direction.

17. The range hood according to claim 12, wherein an included angle between a tangential plane at any point on the second decelerating surface and the inner wall of the frame is β, and β is greater than 0 ° and less than or equal to 5 °.

18. The range hood of claim 10, wherein a distance between a surface of the second sound absorbing assembly facing the air inlet and the inner wall of the housing is constant along the air intake direction or increases along the air intake direction.

19. The range hood of any one of claims 10-18, wherein the second sound absorbing assembly is made of a sound absorbing material and is adhered to the frame, or,

the sound subassembly is inhaled to the second with inject the second between the frame and inhale the sound chamber, the sound subassembly is inhaled to the second is equipped with the intercommunication a plurality of seconds in the sound chamber are inhaled to the second are inhaled the sound hole.

20. The range hood of any one of claims 10-18, wherein the second sound absorbing assembly comprises:

a second sound-absorbing member made of a sound-absorbing material;

the second fairing, the second fairing install in frame and cover are established the sound piece is inhaled to the second, the second fairing is equipped with a plurality of second bloops so as to allow the noise to pass the second fairing.

21. The range hood of claim 20, wherein a second sound dampening cavity is defined between the second sound absorbing member and the inner surface of the second cowling, the second sound dampening cavity being in communication with the second sound dampening hole.