Noise reduction structure, range hood and operation method of range hood

Abstract

The present invention discloses a noise reduction structure, an oil fume extractor and an operation method of the oil fume extractor. The noise reduction structure includes a supersaturated solution generating device, which is arranged outside the casing of the oil fume extractor, and the supersaturated solution generating device is used for mixing a liquid and a gas to form a supersaturated solution; a sound collecting structure, which is arranged outside the casing and communicated with the air inlet of the volute of the oil fume extractor; a sound absorption structure, which is arranged outside the casing, and the supersaturated solution generating device and the sound collecting structure are both communicated with the sound absorption structure. The sound collecting structure conveys the noise generated by the volute to the sound absorption structure, and the supersaturated solution flows into the sound absorption structure and contacts the noise to absorb the sound energy of the noise. The oil fume extractor provided by the present invention includes the above-mentioned noise reduction structure.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and in particular to a noise reduction structure, an oil fume extractor and an operation method of the oil fume extractor. Background Art

[0002] In recent years, the domestic oil fume extractor market has been mainly promoting oil fume extractors with large air volume and large suction functions. With the gradual increase of the wind force of the oil fume extractor, the noise generated by the oil fume extractor is also getting louder. When the range hood is turned on during cooking, one cannot hear voices, phone calls, doorbells, or the voices of children. Moreover, this strong noise can cause adverse reactions such as irritability, headache, and palpitation in cooking operators in the kitchen. Long-term use will have a serious impact on physical and mental health.

[0003] Therefore, there is an urgent need for a noise reduction structure to solve the above problems. Summary of the Invention

[0004] The present invention aims to solve at least one of the problems existing in the related art to some extent. For this purpose, the present invention provides a noise reduction structure, which has a good noise reduction effect on the oil fume extractor and avoids the influence of the noise of the oil fume extractor on users.

[0005] The above object is achieved by the following technical solutions:

[0006] On the one hand, the present invention provides a noise reduction structure, including:

[0007] A supersaturated solution generating device, which is arranged outside the casing of the oil fume extractor, and the supersaturated solution generating device is used to mix a liquid and a gas to form a supersaturated solution;

[0008] A sound collecting structure, which is arranged outside the casing and communicates with the air inlet of the volute of the oil fume extractor;

[0009] A sound absorbing structure, which is arranged outside the casing, and the supersaturated solution generating device and the sound collecting structure are both communicated with the sound absorbing structure. The sound collecting structure conveys the noise generated by the volute to the sound absorbing structure, and the supersaturated solution flows into the sound absorbing structure and contacts the noise to absorb the sound energy of the noise.

[0010] Optionally, the supersaturated solution generating device includes:

[0011] A liquid inlet pipe for circulating the liquid;

[0012] A gas inlet pipe for circulating the gas;

[0013] A pressurization structure, the liquid outlet end of the liquid inlet pipe and the gas outlet end of the gas inlet pipe are both connected to the pressurization structure, and the pressurization structure is used to generate pressure to mix the liquid flowing in from the liquid inlet pipe and the gas flowing in from the gas inlet pipe, so that the gas is incorporated into the liquid to form a supersaturated solution.

[0014] Optionally, the liquid inlet end of the liquid inlet pipe is communicated with a water supply pipe outside the noise reduction structure, and a first valve is arranged on the liquid inlet pipe.

[0015] Optionally, the gas inlet end of the gas inlet pipe is communicated with the air outside the noise reduction structure, and a second valve is arranged on the gas inlet pipe.

[0016] Optionally, sound holes are opened in a part of the casing close to the volute, and the sound collecting structure includes:

[0017] A sound collecting member, one end of which is arranged on the casing and communicated with the sound hole;

[0018] A sound guiding pipe, one end of which is communicated with the other end of the sound collecting member, and the other end is communicated with the sound elimination structure.

[0019] Optionally, the diameter of the sound collecting member gradually decreases from the end connected to the casing to the end connected to the sound guiding pipe, and a plurality of the sound holes are arranged, and the plurality of sound holes are surrounded inside the sound collecting member.

[0020] Optionally, the sound elimination structure includes:

[0021] A sound elimination shell, inside which a sound elimination cavity is arranged, and the supersaturated solution generating device is communicated with the sound elimination cavity to convey the supersaturated solution into the sound elimination cavity;

[0022] A sound elimination pipe, arranged in the sound elimination cavity and communicated with the sound collecting structure, and noise is introduced into the sound elimination pipe from the sound collecting structure.

[0023] Optionally, the sound elimination pipe includes a plurality of sub-sound elimination pipes, one ends of the plurality of sub-sound elimination pipes all extend into the sound elimination cavity, and the other ends are all communicated with the sound collecting structure.

[0024] Optionally, the sound elimination pipe further includes:

[0025] A main sound elimination pipe, one end of which is communicated with the sound collecting structure;

[0026] A plurality of transition sound elimination pipes, one ends of which are all communicated with the main sound elimination pipe, and the other ends are arranged corresponding to and communicated with the plurality of sub-sound elimination pipes one by one.

[0027] Optionally, a plurality of groups of the sound elimination pipes are arranged.

[0028] Optionally, the sound deadening duct can move relative to the sound deadening housing, and the sound deadening structure further includes an adjustment structure for adjusting the length of the sound deadening duct extending into the sound deadening cavity.

[0029] Optionally, the adjustment structure includes:

[0030] An elastic ventilation member through which the sound deadening duct communicates with the sound collecting structure;

[0031] A driving member provided on the sound deadening housing;

[0032] A transmission member having one end drivingly connected to the output end of the driving member and the other end connected to the elastic ventilation member. The driving member can push the elastic ventilation member to expand and contract through the transmission member to drive the sound deadening duct to move relative to the sound deadening housing.

[0033] Optionally, a liquid guiding structure is further included. The liquid guiding structure is arranged between the supersaturated solution generating device and the sound deadening structure for guiding the supersaturated solution into the sound deadening structure. The liquid guiding structure includes a liquid guiding pipe and a liquid guiding box. One end of the liquid guiding pipe communicates with the supersaturated solution generating device, and the other end communicates with the first end of the liquid guiding box. The second end of the liquid guiding box communicates with the sound deadening structure. The width of the liquid guiding box gradually increases from the first end to the second end.

[0034] On the other hand, the present invention provides a range hood, including a housing and further including the above-mentioned noise reduction structure.

[0035] On yet another aspect, the present invention provides an operating method for a range hood as described above, including the following steps:

[0036] S1: The range hood is turned on;

[0037] S2: Determine the rotational speed V of the fan of the range hood. If the rotational speed V of the fan is less than or equal to the first preset value Nrpm, the supersaturated solution generating device is turned off and the adjustment structure is turned off. If the rotational speed V of the fan is greater than the first preset value Nrpm, then proceed to S3;

[0038] S3: The supersaturated solution generating device is turned on with a preset power W10. The amount of gas entering the supersaturated solution generating device is Q10, and the amount of liquid entering the supersaturated solution generating device is Q20;

[0039] S4: Judge the rotational speed V of the fan. If the rotational speed V of the fan is N1rpm, the adjustment structure adjusts the length of the sound deadening duct extending into the sound deadening cavity to be H1cm. Moreover, when the rotational speed V of the fan increases by a second preset value N2rpm based on N1rpm, the length of the sound deadening duct extending into the sound deadening cavity increases by a preset proportional value;

[0040] S5: If the range hood is turned off, the supersaturated solution generating device is turned off, and the adjusting structure is turned off.

[0041] Optionally, the first preset value Nrpm is 800 rpm, the second preset value N2rpm is 300 rpm, and the preset ratio value is 20%.

[0042] Compared with the prior art, the present invention has at least the following beneficial effects:

[0043] The present invention generates a supersaturated solution by setting a supersaturated solution generating device, and uses the supersaturated solution to contact the noise in the sound absorption structure to absorb the sound energy of the noise, thereby achieving the noise reduction effect of the range hood and avoiding the greater impact of the noise of the range hood on users. Description of the Drawings

[0044] Figure 1 is a schematic three-dimensional structure diagram of a range hood provided by the present invention;

[0045] Figure 2 is a top view of a range hood provided by a specific embodiment of the present invention;

[0046] Figure 3 is Figure 2 a sectional view at A in

[0047] Figure 4 is an assembly diagram of a sound absorption structure and an adjusting structure of a noise reduction structure provided by a specific embodiment of the present invention;

[0048] Figure 5 is an assembly diagram of a sound absorption shell of a noise reduction structure and a sound absorption pipe after removing the upper sound absorption shell provided by a specific embodiment of the present invention;

[0049] Figure 6 is a schematic three-dimensional structure diagram of a sound absorption pipe of a noise reduction structure provided by a specific embodiment of the present invention;

[0050] Figure 7 is a step diagram of an operation method of a range hood provided by a specific embodiment of the present invention.

[0051] In the figure:

[0052] 1. Housing;

[0053] 21. Air inlet pipe; 22. Second valve;

[0054] 31. Liquid inlet pipe; 32. First valve;

[0055] 4. Reflux cup; 41. Air outlet valve; 42. Air outlet pipe;

[0056] 5. Pressurizing structure; 51. Conical shell; 52. Spiral vane; 53. Liquid guide pipe; 54. Liquid guide box;

[0057] 6. Sound absorption structure; 61. Lower sound absorption shell; 62. Upper sound absorption shell; 621. Liquid inlet hole; 63. Sound absorption pipeline; 631. Main sound absorption pipe; 632. Branch sound absorption pipe; 633. Transition sound absorption pipe; 64. Driving part; 65. Transmission part; 66. Elastic ventilation part;

[0058] 7. Sound collecting structure; 71. Sound collecting part; 72. Sound guiding pipe;

[0059] 8. Smoke collecting hood;

[0060] 9. Return pipe. Detailed implementation manners

[0061] The following embodiments are used to illustrate the present invention, but the present invention is not limited by these embodiments. Modifying the specific implementation manners of the present invention or equivalently replacing some technical features, without departing from the spirit of the solution of the present invention, shall all be covered by the scope of the technical solution claimed by the present invention.

[0062] Please refer to Figures 1-6 , the present invention provides a noise reduction structure, including a supersaturated solution generating device, a sound collecting structure 7 and a sound absorption structure 6. The supersaturated solution generating device is arranged outside the casing 1 of the range hood. The supersaturated solution generating device is used to mix liquid and gas to form a supersaturated solution. The sound collecting structure 7 is arranged outside the casing 1 and communicated with the air inlet of the volute of the range hood. The sound absorption structure 6 is arranged outside the casing 1. Both the supersaturated solution generating device and the sound collecting structure 7 are communicated with the sound absorption structure 6. The sound collecting structure 7 conveys the noise generated by the volute into the sound absorption structure 6. The supersaturated solution flows into the sound absorption structure 6 and contacts the noise to absorb the sound energy of the noise.

[0063] The present invention generates a supersaturated solution by setting a supersaturated solution generating device, and uses the supersaturated solution to contact the noise in the sound absorption structure 6 to absorb the sound energy of the noise, so as to achieve the noise reduction effect of the range hood and avoid the noise of the range hood from having a great impact on users.

[0064] Optionally, the supersaturated solution generating device includes a liquid inlet pipe 31, a gas inlet pipe 21 and a pressurizing structure 5. The liquid inlet pipe 31 is used for flowing liquid. The gas inlet pipe 21 is used for flowing gas. The liquid outlet end of the liquid inlet pipe 31 and the gas outlet end of the gas inlet pipe 21 are both connected to the pressurizing structure 5. The pressurizing structure 5 is used to generate pressure to mix the liquid flowing in from the liquid inlet pipe 31 and the gas flowing in from the gas inlet pipe 21, so that the gas is incorporated into the liquid to form a supersaturated solution.

[0065] Optionally, the pressurizing structure 5 includes a conical housing 51 and a spiral blade. The spiral blade is disposed inside the conical housing 51 and is close to the inner wall of the conical housing 51. The liquid inlet pipe 31 and the gas inlet pipe 21 are both connected to the large-diameter end of the conical housing 51. Gas and liquid enter the conical housing 51 from the large-diameter end of the conical housing 51. And the spiral blade rotates, simultaneously pushing the gas and the liquid to flow from the large-diameter end of the conical housing 51 to the small-diameter end of the conical housing 51, so that the gas is dissolved into the liquid under the action of high pressure to form a supersaturated solution.

[0066] Optionally, the liquid inlet end of the liquid inlet pipe 31 is communicated with a water supply pipe outside the noise reduction structure (i.e., the liquid is an aqueous solution). A first valve 32 is provided on the liquid inlet pipe 31. The first valve 32 is used to control the on-off of the liquid inlet pipe 31. When the supersaturated solution generating device operates, the first valve 32 is opened. When the supersaturated solution generating device stops, the first valve 32 is closed. In other embodiments, the liquid may also be a sodium chloride solution, a sodium nitrate solution, etc., which are not limited herein.

[0067] Optionally, the gas inlet end of the gas inlet pipe 21 is communicated with air outside the noise reduction structure (i.e., the gas is air). A second valve 22 is provided on the gas inlet pipe 21. The second valve 22 is used to control the on-off of the gas inlet pipe 21. When the supersaturated solution generating device operates, the second valve 22 is opened. When the supersaturated solution generating device stops, the second valve 22 is closed. In other embodiments, the gas may also be a gas such as carbon dioxide, oxygen, etc., which are not limited herein.

[0068] Optionally, sound holes are formed in a part of the housing 1 close to the volute. The sound collecting structure 7 includes a sound collecting member 71 and a sound guiding pipe 72. One end of the sound collecting member 71 is disposed on the housing 1 and is communicated with the sound holes. One end of the sound guiding pipe 72 is communicated with the other end of the sound collecting member 71, and the other end is communicated with the sound absorption structure 6. The noise generated by the volute enters the sound collecting member 71 through the sound holes, and then enters the sound absorption structure 6 through the sound guiding pipe 72.

[0069] Optionally, the diameter of the sound collecting member 71 gradually decreases from the end connected to the housing 1 to the end connected to the sound guiding pipe 72. A plurality of sound holes are provided. The plurality of sound holes are surrounded inside the sound collecting member 71. In this way, the noise transmitted through the plurality of sound holes can be collected in the sound collecting member 71. By providing a plurality of sound holes, it is convenient for more noise to be transmitted out of the housing 1 of the range hood.

[0070] Optionally, the sound insulation structure 6 includes a sound insulation shell and a sound insulation duct 63. A sound insulation cavity is arranged inside the sound insulation shell, and the supersaturated solution generating device is communicated with the sound insulation cavity to convey the supersaturated solution into the sound insulation cavity. The sound insulation duct 63 is arranged inside the sound insulation cavity and communicated with the sound collecting structure 7. Noise enters the sound insulation duct 63 from the sound collecting structure 7. The noise in the sound insulation duct 63 contacts the supersaturated solution in the sound insulation cavity through the tube wall of the sound insulation duct, so that the sound energy of the noise is absorbed by the supersaturated solution, thereby achieving the effect of noise reduction.

[0071] Optionally, the sound insulation duct 63 includes a plurality of sub-sound insulation ducts 632. One ends of the plurality of sub-sound insulation ducts 632 all extend into the sound insulation cavity, and the other ends are all communicated with the sound collecting structure 7. By arranging the plurality of sub-sound insulation ducts 632, the noise can contact the supersaturated solution more uniformly and closely through the tube walls of the sub-sound insulation ducts 632, so that the sound energy of the noise can be absorbed by the supersaturated solution more quickly and in greater quantity, thereby improving the noise reduction effect of the range hood.

[0072] Optionally, the sound insulation duct 63 further includes a main sound insulation duct 631 and a plurality of transition sound insulation ducts 633. One end of the main sound insulation duct 631 is communicated with the sound collecting structure 7. One ends of the plurality of transition sound insulation ducts 633 are all communicated with the main sound insulation duct 631, and the other ends are arranged and communicated with the plurality of sub-sound insulation ducts 632 in a one-to-one correspondence, and the plurality of sub-sound insulation ducts 632 are arranged in parallel.

[0073] Optionally, a plurality of groups of sound insulation ducts 63 are provided to further enable the sound energy of the noise to be absorbed by the supersaturated solution more quickly and in greater quantity, thereby improving the noise reduction effect of the range hood.

[0074] Optionally, the sound insulation duct 63 can move relative to the sound insulation shell. The sound insulation structure 6 further includes an adjusting structure for adjusting the length of the sound insulation duct 63 extending into the sound insulation cavity, so that the noise reduction structure can reduce the noise of the range hood according to the actual noise level of the range hood, making the noise reduction structure more flexible.

[0075] Optionally, the adjusting structure includes an elastic air vent 66, a driving member 64 and a transmission member 65. The sound insulation duct 63 is communicated with the sound collecting structure 7 through the elastic air vent 66. The driving member 64 is arranged on the sound insulation shell. One end of the transmission member 65 is in transmission connection with the output end of the driving member 64, and the other end is connected with the elastic air vent 66. The driving member 64 can push the elastic air vent 66 to expand and contract through the transmission member 65 to drive the sound insulation duct 63 to move relative to the sound insulation shell, thereby adjusting the length of the sound insulation duct 63 extending into the sound insulation cavity to match the actual noise generated by the range hood.

[0076] Exemplarily, the driving member 64 in this embodiment is a hydraulic structure, the transmission member 65 is a hydraulic rod, and the elastic ventilation member 66 is a rubber member. Of course, in other embodiments, the driving member 64 can also be a motor, the transmission member 65 can also be a push rod, and the elastic ventilation member 66 can also be a silica gel member, which is not limited here.

[0077] Optionally, a liquid guiding structure is further included. The liquid guiding structure is arranged between the supersaturated solution generating device and the sound absorption structure 6 and is used to introduce the supersaturated solution into the sound absorption structure 6. The liquid guiding structure includes a liquid guiding pipe 53 and a liquid guiding box 54. One end of the liquid guiding pipe 53 is communicated with the supersaturated solution generating device, and the other end is communicated with the first end of the liquid guiding box 54. The second end of the liquid guiding box 54 is communicated with the sound absorption structure 6. The width of the liquid guiding box 54 gradually increases from the first end to the second end to guide the supersaturated solution to cover the upper side of the sound absorption shell, and then falls into the sound absorption cavity from the liquid inlet holes 621 uniformly opened on the upper side of the sound absorption shell, so that the supersaturated solution can be more evenly distributed in each part of the sound absorption cavity in a short time, which is convenient for uniformly reducing the noise in the sub-sound absorption pipe 632.

[0078] Optionally, the sound absorption shell includes a sound absorption lower shell 61 and a sound absorption upper shell 62. Among them, the upper side of the sound absorption lower shell 61 has an opening, the sound absorption upper shell 62 is arranged at the opening of the sound absorption lower shell 61 and is detachably connected to the sound absorption lower shell 61. The sound absorption upper shell 62 and the sound absorption lower shell 61 enclose a sound absorption cavity, and the liquid inlet holes 621 are arranged on the sound absorption upper shell 62.

[0079] Optionally, the sub-sound absorption pipe 632 extends into the sound absorption cavity through the side wall of the sound absorption lower shell 61 and can slide relative to the sound absorption lower shell 61. An elastic sealing member is arranged between the sub-sound absorption pipe 632 and the sound absorption lower shell 61. On the one hand, it is convenient for the sub-sound absorption pipe 632 to slide relative to the sound absorption lower shell 61, and on the other hand, it is used to prevent the supersaturated solution from flowing out of the sound absorption cavity through the gap between the sub-sound absorption pipe 632 and the sound absorption lower shell 61.

[0080] Optionally, a reflux structure is further included. The reflux structure includes a reflux pipe 9, a reflux cup 4 and an air outlet pipe 42. The reflux cup 4 is arranged on the machine shell 1. One end of the reflux pipe 9 is communicated with the sound absorption cavity, one end of the air outlet pipe 42 is communicated with the reflux cup 4, and the other end is communicated with the outside of the range hood. After the supersaturated solution in the sound absorption cavity absorbs the sound energy of the noise, the liquid and gas are separated. The separated liquid and gas both flow into the reflux cup 4 through the reflux pipe 9, and the gas in the reflux cup 4 flows out of the range hood through the air outlet pipe 42.

[0081] Optionally, the liquid inlet end of the liquid inlet pipe 31 is communicated with the reflux cup 4. The water in the reflux cup 4 continues to flow to the pressurizing structure 5 through the liquid inlet pipe 31 and is mixed with the gas to form a supersaturated solution, thereby realizing the reuse of water and reducing energy consumption.

[0082] Optionally, the reflux structure further includes an air outlet valve 41, which is arranged on the air outlet pipe 42 and used to control the on-off of the air outlet pipe 42. When the supersaturated solution generating device is operating, the air outlet valve 41 is opened, and when the saturated solution generating device stops, the air outlet valve 41 is closed to prevent dust from entering the reflux cup 4.

[0083] Optionally, it further includes a water inlet pipe, one end of which is connected to the water supply pipe outside the range hood, and the other end is connected to the reflux cup 4 to supplement the water lost during the process of flowing back to the reflux cup 4 via the reflux pipe 9 and ensure that the supersaturated solution has a sufficient amount.

[0084] On the other hand, the present invention provides a range hood, which includes a casing 1 and also includes the above noise reduction structure.

[0085] Optionally, it further includes a smoke collecting hood 8, which is arranged on the lower side of the casing 1.

[0086] Please refer to Figure 7 , on yet another aspect, the present invention provides an operation method of a range hood as described above, including the following steps:

[0087] S1: The range hood is powered on.

[0088] S2: Determine the rotational speed V of the fan of the range hood. If the rotational speed V of the fan is less than or equal to the first preset value Nrpm, the supersaturated solution generating device is closed and the adjusting structure is closed. If the rotational speed V of the fan is greater than the first preset value Nrpm, then proceed to S3.

[0089] S3: The supersaturated solution generating device is turned on with a preset power W10, the amount of gas entering the supersaturated solution generating device is Q10, and the amount of liquid entering the supersaturated solution generating device is Q20.

[0090] S4: Judge the rotational speed V of the fan. If the rotational speed V of the fan is N1rpm, the adjusting structure adjusts the length of the sound insulation pipe 63 extending into the sound insulation cavity to be H1cm. And when the rotational speed V of the fan increases by the second preset value N2rpm based on N1rpm, the length of the sound insulation pipe 63 extending into the sound insulation cavity increases by a preset proportional value.

[0091] S5: The range hood is powered off, then the supersaturated solution generating device is closed and the adjusting structure is closed.

[0092] Specifically, since the noise of the range hood is mainly generated by the rotation of the blower in the volute, the faster the blower rotates, the greater the noise of the range hood. The present invention determines the magnitude of the noise of the range hood according to the rotational speed V of the blower, and thus adjusts the length of the sound-absorbing pipe 63 extending into the sound-absorbing cavity to ensure the sound-absorbing effect. When the rotational speed of the range hood is lower than the first preset value, it indicates that the noise generated by the range hood is not large. At this time, the noise reduction device is not turned on to achieve the effect of energy conservation and consumption reduction.

[0093] Optionally, the first preset value Nrpm is 800 rpm, the second preset value N2rpm is 300 rpm, and the preset ratio value is 20%.

[0094] Exemplarily, in this embodiment, when the rotational speed V of the blower is 1000 rpm, the length of the sound-absorbing pipe 63 extending into the sound-absorbing cavity is 10 cm. When the rotational speed V of the blower increases by 300 rpm on the basis of 1000 rpm, the length of the sound-absorbing pipe 63 extending into the sound-absorbing cavity increases by 20%, that is, 2 cm.

[0095] It should be noted that the preset power W10 of the supersaturated solution generating device, the amount Q10 of gas entering the supersaturated solution generating device, and the amount Q20 of liquid entering the supersaturated solution generating device can be set according to actual requirements, as long as it can ensure that when the sound-absorbing pipe extends entirely into the sound-absorbing cavity, noise reduction can be achieved for the blower at the maximum rotational speed.

[0096] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A noise reduction structure, characterized in that Comprising: An oversaturated solution generating device, which is arranged outside the casing (1) of the range hood, and the oversaturated solution generating device is used to mix a liquid and a gas to form an oversaturated solution; A sound collecting structure (7), which is arranged outside the casing (1) and communicated with the air inlet of the volute of the range hood; A sound silencing structure (6), which is arranged outside the casing (1), and both the oversaturated solution generating device and the sound collecting structure (7) are communicated with the sound silencing structure (6). The sound collecting structure (7) conveys the noise generated by the volute into the sound silencing structure (6). The oversaturated solution flows into the sound silencing structure (6) and contacts the noise to absorb the sound energy of the noise. The sound silencing structure (6) includes: A sound silencing shell (60), which is internally provided with a sound silencing cavity. The oversaturated solution generating device is communicated with the sound silencing cavity to convey the oversaturated solution into the sound silencing cavity; A sound silencing pipe (63), which is arranged in the sound silencing cavity and communicated with the sound collecting structure (7). Noise is introduced into the sound silencing pipe (63) from the sound collecting structure (7). The sound silencing pipe (63) can move relative to the sound silencing shell (60). The sound silencing structure (6) further includes an adjusting structure, and the adjusting structure is used to adjust the length of the sound silencing pipe (63) extending into the sound silencing cavity; The adjusting structure includes: An elastic ventilation member (66), and the sound silencing pipe (63) is communicated with the sound collecting structure (7) through the elastic ventilation member (66); A driving member (64), which is arranged on the sound silencing shell (60); A transmission member (65), one end of which is in transmission connection with the output end of the driving member (64), and the other end is connected with the elastic ventilation member (66). The driving member (64) can push the elastic ventilation member (66) to expand and contract through the transmission member (65) to drive the sound silencing pipe (63) to move relative to the sound silencing shell (60).

2. The noise reduction structure according to claim 1, wherein The oversaturated solution generating device includes: A liquid inlet pipe (31), which is used for circulating the liquid; A gas inlet pipe (21), which is used for circulating the gas; A pressurizing structure (5), the liquid outlet end of the liquid inlet pipe (31) and the gas outlet end of the gas inlet pipe (21) are both connected to the pressurizing structure (5). The pressurizing structure is used to generate pressure to mix the liquid flowing in from the liquid inlet pipe (31) and the gas flowing in from the gas inlet pipe (21), so that the gas is incorporated into the liquid to form an oversaturated solution.

3. The noise reduction structure according to claim 2, characterized in that, The liquid inlet end of the liquid inlet pipe (31) is communicated with a water supply pipe outside the noise reduction structure, and a first valve (32) is arranged on the liquid inlet pipe (31).

4. The noise reduction structure according to claim 2, wherein The gas inlet end of the gas inlet pipe (21) is communicated with the air outside the noise reduction structure, and a second valve (22) is arranged on the gas inlet pipe (21).

5. The noise reduction structure according to claim 1, characterized in that, Sound transmission holes are opened in the part of the casing (1) close to the volute. The sound collecting structure (7) includes: A sound collecting member (71), one end of which is arranged on the casing (1) and communicated with the sound transmission hole; A sound guiding pipe (72), one end of which is communicated with the other end of the sound collecting member (71), and the other end is communicated with the sound silencing structure (6).

6. The noise reduction structure according to claim 5, characterized in that, The diameter of the sound collecting member (71) gradually decreases from the end connected to the casing (1) to the end connected to the sound guiding pipe (72). A plurality of sound passing holes are provided, and the plurality of sound passing holes are surrounded inside the sound collecting member (71).

7. The noise reduction structure according to claim 1, wherein, The sound silencing duct (63) includes a plurality of sub-sound silencing pipes (632). One ends of the plurality of sub-sound silencing pipes (632) all extend into the sound silencing cavity, and the other ends are all communicated with the sound collecting structure (7).

8. The noise reduction structure according to claim 7, wherein, The sound silencing duct (63) further includes: A main sound silencing pipe (631) whose one end is communicated with the sound collecting structure (7); A plurality of transition sound silencing pipes (633) whose one ends are all communicated with the main sound silencing pipe (631), and the other ends are arranged and communicated with the plurality of sub-sound silencing pipes (632) in one-to-one correspondence.

9. The noise reduction structure according to claim 1, wherein A plurality of groups of the sound silencing ducts (63) are provided.

10. The noise reduction structure according to any one of claims 1-6, characterized in that, It further includes a liquid guiding structure. The liquid guiding structure is arranged between the supersaturated solution generating device and the sound silencing structure (6) and is used for guiding the supersaturated solution into the sound silencing structure (6). The liquid guiding structure includes a liquid guiding pipe (53) and a liquid guiding box (54). One end of the liquid guiding pipe (53) is communicated with the supersaturated solution generating device, and the other end is communicated with the first end of the liquid guiding box (54). The second end of the liquid guiding box (54) is communicated with the sound silencing structure (6). The width of the liquid guiding box (54) gradually increases from the first end to the second end.

11. An oil fume extractor, comprising a housing (1), characterized in that, It further includes the noise reduction structure according to any one of claims 1-10.

12. A running method of a range hood as described in claim 11, characterized in that, It includes the following steps: S1: The range hood is turned on. S2: Determine the rotational speed V of the fan of the range hood. If the rotational speed V of the fan is less than or equal to the first preset value Nrpm, the supersaturated solution generating device is turned off and the adjusting structure is turned off. If the rotational speed V of the fan is greater than the first preset value Nrpm, go to S3; S3: The supersaturated solution generating device is turned on with a preset power W10. The amount of gas entering the supersaturated solution generating device is Q10, and the amount of liquid entering the supersaturated solution generating device is Q20; S4: Judge the rotational speed V of the fan. If the rotational speed V of the fan is N1rpm, the adjusting structure adjusts the length of the sound silencing duct (63) extending into the sound silencing cavity to be H1cm. And when the rotational speed V of the fan increases by a second preset value N2rpm on the basis of N1rpm, the length of the sound silencing duct (63) extending into the sound silencing cavity increases by a preset proportional value. The preset proportional value is the ratio of the further length of the sound silencing duct (63) extending into the sound silencing cavity to H1cm; S5: The range hood is turned off, then the supersaturated solution generating device is turned off and the adjusting structure is turned off.

13. The operating method of the range hood according to claim 12, characterized in that, The first preset value Nrpm is 800rpm, the second preset value N2rpm is 300rpm, and the preset proportional value is 20%.

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