CN110805944A

CN110805944A - Smoke exhaust ventilator

Info

Publication number: CN110805944A
Application number: CN201911116834.8A
Authority: CN
Inventors: 杨星星; 黎本锋
Original assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Priority date: 2017-05-23
Filing date: 2017-05-23
Publication date: 2020-02-18
Also published as: CN110805942A; CN110805943A; CN106958846A

Abstract

The invention discloses a range hood, comprising: a housing; a smoking device at least partially disposed within the housing, the smoking device including a volute and an impeller positioned within the volute; a steam washing device including a steam generator and a spray tube at least partially located within the volute and configured to spray steam generated by the steam generator to the impeller; wherein the volute has a smoke inlet, and the nozzle is mounted to a portion of the volute outside the smoke inlet in a manner offset from the smoke inlet. In the range hood, the spray pipe can spray the steam generated by the steam generator to the impeller, so that the cleaning effect of the impeller is good, and the stable performance of the range hood is ensured.

Description

Smoke exhaust ventilator

The application is a divisional application with application date of 2017, 5 and 23, application number of 201710367550.0 and invented name of 'extractor hood'.

Technical Field

The invention relates to the technical field of household appliances, in particular to a range hood.

Background

In the related technology, the performance of the range hood is reduced and bacteria are bred due to the adhesion of oil stains in an air duct and on an impeller in the use process of the range hood, so that the range hood needs to be cleaned, and the performance of the range hood is kept stable.

At present, the range hood is mainly cleaned by adopting modes of heating oil, cold water and the like, but the cleaning effect of the cleaning mode is not good.

Disclosure of Invention

The present invention has been made to solve at least one of the problems occurring in the related art. Therefore, the embodiment of the invention needs to provide a range hood.

The range hood comprises a shell, a smoking device and a steam washing device, wherein the smoking device is at least partially arranged in the shell, the steam washing device comprises a steam generator and a spray pipe, the steam generator is connected with the spray pipe through a pipeline, the smoking device comprises a volute and an impeller positioned in the volute, and the spray pipe is at least partially positioned in the volute and is used for spraying steam generated by the steam generator to the impeller.

In the range hood, the spray pipe can spray the steam generated by the steam generator to the impeller, so that the cleaning effect of the impeller is good, and the stable performance of the range hood is ensured.

In some embodiments, the range hood includes an elastic member, the pipe includes a steam pipe, the steam pipe connects the steam generator and the spray pipe, and the elastic member is sleeved on the steam pipe.

In some embodiments, the nozzle defines a plurality of nozzle holes, the plurality of nozzle holes are located in the volute, and the plurality of nozzle holes are spaced apart along a rotation axis parallel to the impeller.

In some embodiments, the plurality of nozzle holes include at least one first nozzle hole and at least one second nozzle hole, the first nozzle hole is formed in a side surface of the nozzle, and the second nozzle hole is formed at a junction of the side surface and the end surface of the nozzle.

In some embodiments, an angle formed by the axial direction of the second nozzle hole and the axial direction of the nozzle is in a range of 10 to 60 degrees, and the axial direction of the first nozzle hole is perpendicular to the axial direction of the nozzle.

In some embodiments, the spray pipe includes a mounting portion and a nozzle hole portion, the mounting portion is connected to the nozzle hole portion, the nozzle hole portion is located in the volute, the volute is provided with a mounting hole, the mounting portion includes a convex portion and a combining portion, the convex portion is located in the volute and abuts against an inner surface of the volute through a gasket, the combining portion penetrates through the mounting hole, the range hood includes a fastener located outside the volute, and the fastener is connected to the combining portion and installs the spray pipe on the volute.

In some embodiments, the nozzle includes a non-slip portion connected to the joint portion, the non-slip portion being located outside the volute, the conduit being tightly fitted over the non-slip portion.

In some embodiments, the combining portion is formed with a positioning section, and the mounting hole is formed with a positioning side surface, the positioning section being engaged with the positioning side surface and positioning a relative position of the nozzle hole portion and the impeller.

In some embodiments, the volute is provided with a smoke inlet, the impeller is disposed corresponding to the smoke inlet, the range hood includes an oil collecting ring and an oil guiding portion, the oil collecting ring is mounted on the volute and is opposite to an edge of the smoke inlet, the oil guiding portion is connected to the oil collecting ring, and an angle formed by the positioning side surface and an axial direction of the oil guiding portion ranges from 10 ° to 60 °.

In some embodiments, the steam generator includes a heat generating body, a water pump, and a connection pipe connecting the heat generating body and the water pump, the heat generating body, the connection pipe, and the water pump together constituting a U-shaped arrangement.

In some embodiments, the housing includes a lower side plate, the lower side plate defines a through hole, the conduit includes a water inlet conduit, the water inlet conduit connects the water cup and the steam generator, the water cup is located outside the housing, and the water inlet conduit penetrates through the through hole.

In some embodiments, the number of the impellers is two, the volute is provided with two smoke inlets, the two impellers are arranged in the volute at intervals, each impeller is arranged corresponding to one smoke inlet, the number of the spray pipes is two, and each spray pipe is used for spraying the steam generated by the steam generator to a corresponding impeller.

In some embodiments, the range of steam injected by the nozzle covers the circumferential side surface of the impeller and the bottom surface of the impeller.

Additional aspects and advantages of embodiments 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

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic perspective view of a range hood according to an embodiment of the present invention;

fig. 2 is a bottom view of a range hood according to an embodiment of the present invention;

fig. 3 is another perspective view of the range hood according to the embodiment of the present invention;

FIG. 4 is a schematic partial cross-sectional view of a range hood in accordance with an embodiment of the present invention;

fig. 5 is an exploded view of the installation of the volute and the nozzle of the range hood according to the embodiment of the present invention;

fig. 6 is a schematic perspective view of a nozzle of a range hood according to an embodiment of the present invention;

FIG. 7 is a front view of a range hood nozzle in accordance with an embodiment of the present invention;

FIG. 8 is another front view of a nozzle of a range hood in accordance with an embodiment of the present invention;

fig. 9 is a schematic cross-sectional view of a nozzle of a range hood according to an embodiment of the present invention;

fig. 10 is a schematic view of the connection between the spray pipe and the steam pipe of the range hood according to the embodiment of the present invention;

fig. 11 is a bottom view of a smoke absorbing device of a range hood according to an embodiment of the present invention;

fig. 12 is a schematic structural view of a steam generator of a range hood according to an embodiment of the present invention.

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 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.

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

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and settings of a specific example are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Referring to fig. 1 and 4, a range hood 100 according to an embodiment of the present invention includes a housing 102, a smoking device 104, and a steam washing device 106, wherein the smoking device 104 is at least partially disposed in the housing 102, the steam washing device 106 includes a steam generator 110 and a nozzle 112, the steam generator 110 is connected to the nozzle 112 through a pipe, the smoking device 104 includes a volute 114 and an impeller 116 disposed in the volute 114, and the nozzle 112 is at least partially disposed in the volute 114 and is configured to inject steam generated by the steam generator 110 to the impeller 116.

In the range hood 100, the spray pipe 112 can spray the steam generated by the steam generator 110 to the impeller 116, so that the cleaning effect of the impeller 116 is good, and the stable performance of the range hood 100 is ensured.

In particular, in embodiments of the present invention, the smoking device 104 is disposed within the housing 102, that is, the smoking device 104 is located within the space enclosed by the housing 102. Therefore, the thickness of the range hood 100 can be reduced, and the thin range hood 100 can be realized.

It is understood that in other embodiments, the smoking device 104 may include components that extend outside the housing 102, for example, the smoke inlet 118 of the smoking device 104 may extend outside the housing 102 to reduce the distance between the smoke inlet 118 and the smoke generating region, and for example, the smoke outlet (not shown) of the smoking device 104 may extend outside the housing 102 to accelerate the speed of the smoke emitted by the smoking device 104.

In the embodiment of the present invention, the number of the impellers 116 is two, the volute 114 is provided with two smoke inlets 118, the two impellers 116 are arranged in the volute 114 at intervals, each impeller 116 is arranged corresponding to one smoke inlet 118, the number of the spray pipes 112 is two, and each spray pipe 112 is used for spraying the steam generated by the steam generator 110 to the corresponding impeller 116. Therefore, the range hood 100 with the double impellers 116 can be realized, and the oil fume suction capability of the range hood 100 is enhanced.

Specifically, each impeller 116 may be driven by a motor, which is located within the volute 114. In this manner, each impeller 116 is guaranteed to be able to perform its maximum function.

In the embodiment of the present invention, the impeller 116 is a centrifugal impeller, and the impeller 116 includes a hub and blades disposed on the hub, and the hub is connected to an output shaft of the motor. Air is drawn in from the middle of the impeller 116 and expelled from the circumferential side 117 of the impeller 116. The impeller 116 is transversely disposed in the volute 114 to realize the thin range hood 100. When the impeller 116 is laterally positioned, the axis of rotation a1 of the impeller 116 is substantially perpendicular to the horizontal plane, as shown in fig. 4.

The nozzle 112 is at least partially positioned within the volute 114, it being understood that in some embodiments, the nozzle 112 may also include components positioned outside the volute 114, and the components of the nozzle 112 positioned outside the volute 114 may also clean the surface of the housing 102 outside the volute 114 or be used to secure the nozzle 112; in certain embodiments, the nozzle 112 may also be located entirely within the volute 114.

In addition, in order to prevent the hands or other objects of the user from entering the impeller 116 through the smoke inlet 118 to cause injury to the user and damage to the impeller 116, a filter screen 120 is installed at each smoke inlet 118 on the outer surface of the volute 114, and a collecting cup 122 is further installed on the filter screen 120.

The upper side plate of the housing 102 is formed with an exhaust port 124, and the exhaust port 124 communicates with the exhaust port of the smoking device 104 to exhaust the soot of the smoking device 104 out of the range hood 100.

The water for the steam generator 110 may come from the cup 108. The water cup 108 is connected to the steam generator 110 through a pipe. In some embodiments, extractor hood 100 includes a cup 108.

In the embodiment of the present invention, referring to fig. 3, the housing 102 includes a lower plate 126, the lower plate 126 is provided with a through hole 128, the pipe includes a water inlet pipe 130, the water inlet pipe 130 is connected to the water cup 108 and the steam generator 110, the water cup 108 is located outside the housing 102, and the water inlet pipe 130 penetrates through the through hole 128. Therefore, a user can conveniently add water into the water cup 108, and meanwhile, the water cup 108 is located outside the shell 102, so that the overall structure of the shell 102 is compact, and the thin range hood 100 is favorably realized.

In some embodiments, the range hood 100 includes the elastic member 132, the pipe includes a steam pipe 134, the steam pipe 134 connects the steam generator 110 and the nozzle 112, and the elastic member 132 is sleeved on the steam pipe 134. Thus, when the steam washing device 106 is in operation, the steam pipeline 134 can be prevented from being bent to block the pipeline.

Specifically, the steam pipe 134 is generally made of a flexible pipe, and the steam generated by the steam generator 110 has a certain speed, so that when the steam is output, the steam pipe 134 is easily bent to block the pipe. After the elastic member 132 is sleeved on the steam pipe 134, the steam pipe 134 is prevented from being bent to block the pipe. In the present example, the elastic member 132 is a spring, and it is understood that in other examples, the elastic member 132 may be other hollow elastic members.

In the embodiment of the present invention, the steam pipeline 134 includes a first-stage pipeline 136, a second-stage pipeline 138 and a third-stage pipeline 140, the extractor hood 100 includes a tee 142, the first-stage pipeline 136 connects the steam outlet of the steam generator 110 and the inlet of the tee 142, the second-stage pipeline 138 connects one outlet of the tee 142 and one of the nozzles 112, and the third-stage pipeline 140 connects the other outlet of the tee 142 and the other nozzle 112, so that one steam generator 110 simultaneously provides steam to the two nozzles 112 and cleans the impeller 116.

It should be noted that, preferably, all the joints are locked by the fasteners 144, so as to prevent the pipelines from falling off and causing air leakage and water leakage.

In some embodiments, the nozzle 112 defines a plurality of nozzle holes 146, the plurality of nozzle holes 146 are located in the volute 114, and the plurality of nozzle holes 146 are spaced apart along a rotational axis a1 parallel to the impeller 116. In this way, the cleaning area sprayed by the nozzle 112 can be increased.

In the embodiment of the present invention, the plurality of nozzle holes 146 may be arranged along the same straight line L1, as shown in fig. 7. It is understood that in other embodiments, the plurality of nozzle holes 146 may be arranged along different straight lines L2, L3, as shown in fig. 8.

Preferably, the aperture of the nozzle hole 146 is 1-2.5 mm. In this way, a moderate rate of steam injection from the nozzle holes 146 can be ensured. In some examples, the orifice diameter of the orifice 146 is 1mm, 1.2mm, 1.5mm, 2mm, or 2.5 mm. The apertures of the plurality of orifices 146 may be the same, different, or partially the same.

In certain embodiments, the plurality of nozzle orifices 146 includes at least one first nozzle orifice 148 and at least one second nozzle orifice 150, the first nozzle orifice 148 opening at a side 152 of the nozzle 112, and the second nozzle orifice 150 opening at a junction 156 of the side 152 and the end 154 of the nozzle 112. In this manner, the cleaning area sprayed by the nozzle 112 can be further increased.

Specifically, in the example shown in fig. 6, the number of the first nozzle holes 148 is two, and the number of the second nozzle holes 150 is one. It is understood that the number of the first nozzle holes 148 and the second nozzle holes 150 may be provided in other numbers, and is not particularly limited herein.

In some embodiments, the angle α between the axial direction a2 of the second nozzle hole 150 and the axial direction A3 of the nozzle 112 is in the range of 10 ° to 60 °, and the axial direction a4 of the first nozzle hole 148 is perpendicular to the axial direction A3 of the nozzle 112, so that the steam ejected from the second nozzle hole 150 and the first nozzle hole 148 has good directionality and can be cleaned to the circumferential side surface 117 and the bottom surface 158 of the impeller 116.

Specifically, referring to fig. 4, in the range hood 100 of the embodiment of the present invention, the range of the steam sprayed by the spray pipe 112 covers the circumferential side surface 117 of the impeller 116 and the bottom surface 158 of the impeller 116. In this way, the cleaning effect of the impeller 116 is ensured.

In some examples, α is 10 °, 15 °, 20 °, 30 °, 45 °, 50 °, or 60 °.

In one example, the distance between the nozzle 112 and the impeller 116 may be determined based on the spray range of the first nozzle hole 148 and the spray range of the second nozzle hole 150. Specifically, the injection ranges R1 of the two first nozzle holes 148 are at least seamlessly connected, and the injection range R1 of one first nozzle hole 148 and the injection range R2 of the second nozzle hole 150 are at least seamlessly connected. In the illustration of fig. 4, the overlapping region of the injection ranges R1 of the two first nozzle holes 148, and the overlapping region of the injection range R1 of the one first nozzle hole 148 and the injection range R2 of the second nozzle hole 150 ensures that the impeller 116 can be cleaned to the maximum area.

In some embodiments, referring to fig. 4 and 5, the nozzle 112 includes a mounting portion 160 and a nozzle portion 162, the mounting portion 160 is connected to the nozzle portion 162, the nozzle portion 162 is located in the volute 114, the volute 114 is provided with a mounting hole 164, the mounting portion 160 includes a protrusion 166 and a coupling portion 168, the protrusion 166 is located in the volute 114 and abuts against an inner surface of the volute 114 through a gasket 170, the coupling portion 168 penetrates through the mounting hole 164, the range hood 100 includes a fastener 172 located outside the volute 114, and the fastener 172 is connected to the coupling portion 168 and mounts the nozzle 112 on the volute 114. In this manner, the gasket 170 prevents oil or water from leaking from the volute 114 and the nozzle 112 is relatively simple to install.

Specifically, in the present embodiment, the coupling portion 168 is a threaded portion, the fastener 172 is a nut that locks the threaded portion such that the protrusion 166 presses the washer 170 against the inner surface of the volute 114. The nozzle portion 162 defines a plurality of nozzles 146 including a first nozzle 148 and a second nozzle 150.

Boss 166 is a continuous boss ring on nozzle 112. It is understood that the protrusions 166 may also be intermittent raised rings on the nozzle 112. The side surface 152 of the nozzle 112 is a side surface of the nozzle hole portion 162.

In certain embodiments, the nozzle tube 112 includes a non-slip portion 174, the non-slip portion 174 being coupled to the coupling portion 168, the non-slip portion 174 being located outside the volute 114, and the conduit being tightly fitted over the non-slip portion 174. In this manner, the anti-slip portion 174 makes the pipe less likely to fall off the nozzle 112.

Specifically, in the example shown in FIG. 2, the second length of tubing 138 is secured to the non-slip portion 174 of one of the nozzles 112 and the third length of tubing 140 is secured to the non-slip portion 174 of the other nozzle 112. The steam pipe 134 is locked with the joint of the anti-slip part 174 by the snap 144, as shown in fig. 10.

It will be appreciated that the non-slip portion 174, the junction portion 168 and the injection hole portion 162 are hollow and communicate internally such that steam can enter the injection tube 112 from the steam conduit 134 and then be injected outwardly from the injection hole portion 162.

In some embodiments, the coupling portion 168 defines a locating chamfer 176 and the mounting bore 164 defines a locating side 178, the locating chamfer 176 engaging the locating side 178 and locating the nozzle portion 162 relative to the impeller 116. Thus, the alignment chamfer 176 cooperates with the mounting hole 164 to align the direction of the steam emitted from the nozzle portion 162 so that the steam is emitted onto the impeller 116.

In the present example, the plurality of nozzle holes 146 are arranged along the same straight line L1, and the axial directions of the nozzle holes 146 are all located on the same plane, which is perpendicular to the positioning tangential plane 176, as can be understood with reference to fig. 9.

In some embodiments, referring to fig. 11, the volute 114 is provided with a smoke inlet 118, the impeller 116 is disposed corresponding to the smoke inlet 118, the range hood 100 includes an oil collecting ring 180 and an oil guiding portion 182, the oil collecting ring 180 is mounted on the volute 114 and is opposite to an edge of the smoke inlet 118, the oil guiding portion 182 is connected to the oil collecting ring 180, and an angle θ formed by the positioning side 178 and an axial direction a5 of the oil guiding portion 182 is in a range of 10 ° to 60 °. In this manner, the oil collecting ring 180 can collect the oil or water flowing out through the smoke inlet 118, and the oil or water flows through the oil guiding portion 182 to a designated position of the range hood 100, such as an oil collecting tank (not shown) installed on the rear supporting bar 184 in the housing 102.

In some examples, θ is 10 °, 20 °, 25 °, 30 °, 45 °, 50 °, or 60 °.

In addition, the above-mentioned angle range is a preferable angle range in which the steam sprayed from the spray holes 146 of the spray pipe 112 is sprayed to the blades of the impeller 116. During installation, the position of one of the axial direction a5 and the locating side surface 178 of the oil guiding portion 182 may be determined, and then the position of the other may be determined according to the above-mentioned angle range.

Specifically, the oil gathering ring 180 and the oil guiding portion 182 may both be made of plastic, and the oil gathering ring 180 and the oil guiding portion 182 may be an integrally molded structure. Therefore, the oil collecting ring 180 and the oil guide part 182 have low cost and good sealing performance, and oil and sewage or water are not easy to leak. In the embodiment of the present invention, the number of the oil collecting rings 180 and the oil guiding portion 182 is two, and each oil collecting ring 180 is opposite to the edge of a corresponding one of the smoke inlets 118. The oil guide portion 182 is elongated.

In some embodiments, referring to fig. 12, the steam generator 110 includes a heat generating body 184, a water pump 186 and a connecting pipe 188, the connecting pipe 188 connects the heat generating body 184 and the water pump 186, and the heat generating body 184, the connecting pipe 188 and the water pump 186 together form a U-shaped arrangement. Thus, the space occupied by the steam generator 110 is small, which is beneficial to realizing the thin range hood 100.

Specifically, in the example shown in fig. 12, the steam generator 110 includes a housing 190, the heat generating body 184 and the water pump 186 are located in the housing 190, the inlet end 192 of the heat generating body 184 penetrates through the housing 190, the inlet end 192 is connected to the water cup 108 through the water inlet pipe 130, and the outlet end 194 of the water pump 186 is connected to the inlet of the tee 142 through the first-stage pipe 136. The heating element 184 may be an electric heating element. In the present embodiment, the outlet 194 of the water pump 186 serves as a steam outlet of the steam generator 110, and the steam outlet of the steam generator 110 is opened with a steam outlet of the steam generator 110.

When the steam washing device 106 is operated, the water pump 186 pumps water from the water cup 108, the heating element 184 heats the water to form steam, and the steam is finally sprayed out from the spray pipe 112 to wash the impeller 116.

In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., 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, schematic representations of the above terms 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.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention.

Claims

1. A range hood, comprising:

a housing;

a smoking device at least partially disposed within the housing, the smoking device including a volute and an impeller positioned within the volute;

a steam washing device including a steam generator and a spray tube at least partially located within the volute and configured to spray steam generated by the steam generator to the impeller;

wherein the volute has a smoke inlet, and the nozzle is mounted to a portion of the volute outside the smoke inlet in a manner offset from the smoke inlet.

2. The range hood of claim 1, wherein the nozzle is mounted to the volute from a side of the smoke inlet.

3. The range hood of claim 1, wherein the distance that the spray pipe is offset from the outer peripheral edge of the smoke inlet is greater than the pipe diameter of the spray pipe.

4. The range hood of claim 1 wherein the volute has a first end wall, a second end wall, and a connecting enclosure wall connecting the first end wall and the second end wall, the smoke inlet and the first end wall being on the same side, the nozzle tube being mounted to the first end wall.

5. The range hood of claim 1, wherein the length of the spray pipe inside the volute is greater than the length of the spray pipe outside the volute, and a portion of the spray pipe extending into the volute is provided with spray holes.

6. The range hood of claim 1, wherein the distance between the spray pipe and the circumferential side surface of the impeller is greater than the outer diameter of the spray pipe.

7. The range hood of claim 1, wherein the range hood comprises: a fastener, the fastener and the spout configured to: securing the spout to the volute by manipulating the fastener on the outside of the volute.

8. The range hood of claim 1, wherein the free end of the nozzle extending into the volute is closed.

9. The range hood of claim 1, wherein the nozzle has a plurality of first nozzle holes, and the first nozzle holes are formed in a side surface of the nozzle.

10. The range hood of claim 9, wherein the spray ranges of two adjacent first spray holes are seamlessly connected.

11. The range hood of claim 9 or 10, wherein the spraying ranges of two adjacent first spraying holes have an overlapping area.

12. The range hood of claim 9, wherein the first plurality of spray holes are spaced apart along a rotational axis parallel to the impeller.

13. The range hood of claim 9, wherein the first plurality of spray holes are aligned in a row.

14. The range hood of claim 9, wherein the first spray holes have the same diameter.

15. The range hood of claim 9, wherein the first nozzle hole has a diameter in the range of 1-2.5 mm.

16. The range hood of claim 15, wherein the first nozzle hole has a diameter of 1mm, 1.2mm, 2mm, or 2.5 mm.

17. The range hood of claim 1, wherein one end of the spray pipe located outside the volute is used for being connected with a steam pipeline, and a buckle is arranged at the connection position for locking.

18. The range hood of claim 1, wherein the steam generator comprises a heating element, a water pump and a connecting pipeline, the connecting pipeline connects the heating element and the water pump, and the heating element, the connecting pipeline and the water pump together form a U-shaped arrangement.

19. The range hood of claim 1, wherein the housing is a flat housing, and the axis of rotation of the smoking device is along the thickness of the flat housing.

20. The range hood of claim 1, wherein the range of steam emitted by the lance covers a circumferential side of the impeller.

21. The range hood of claim 4, wherein the nozzle is perpendicular to the first end wall.