CN210599588U - Smoke machine noise reduction device and smoke machine applying same - Google Patents
Smoke machine noise reduction device and smoke machine applying same Download PDFInfo
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- CN210599588U CN210599588U CN201921249986.0U CN201921249986U CN210599588U CN 210599588 U CN210599588 U CN 210599588U CN 201921249986 U CN201921249986 U CN 201921249986U CN 210599588 U CN210599588 U CN 210599588U
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Abstract
The utility model belongs to the oil smoke absorption equipment of kitchen use specifically indicates a device and applied device's cigarette machine of making an uproar falls in cigarette machine. The noise reduction device comprises a covering part which is covered on the air duct system of the range hood, and the covering part is covered on a region between the butt joint of the range hood body and the fan and the air outlet of the fan; a closed cavity is formed between the covering part and the air outlet fan and the impeller of the cigarette machine, and a sound absorption material layer is arranged on the inner surface of the covering part. The technical scheme of the utility model can handle the noise in noise enrichment region, and noise performance index when making the lampblack absorber operation obtains increasing substantially, and is very big to the noise absorption ratio at cladding position, has given the user good use and has experienced. The utility model discloses a semi-closed sound-absorbing structure with wedge portion is located the neck of lampblack absorber air outlet fan position promptly, and is not direct contact with the oil smoke flue, consequently difficult by the cigarette machine greasy dirt cover, can so keep better sound absorption performance in longer cycle.
Description
Technical Field
The utility model belongs to the oil smoke absorption equipment of kitchen use specifically indicates a device and applied device's cigarette machine of making an uproar falls in cigarette machine.
Background
The range hood is used as a necessary household kitchen appliance, and the noise in the operation process of the range hood is one of the performance indexes which are considered by consumers seriously, so the noise reduction work of the range hood is particularly important. For a range hood, the running noise of a fan inside the range hood and the pneumatic noise at an air outlet of an air duct system are always the difficult and key points of noise reduction, especially the noise at the joint of the air outlet and an air exhaust and smoke exhaust pipe is the largest, the noise sources and the enrichment areas of the two parts are mainly concentrated on the upper half part of a range hood shell, and at present, due to the limitation of the internal space of the range hood, the area has no effective noise reduction scheme.
SUMMERY OF THE UTILITY MODEL
To the too big main problem of concentrating on the air duct system part of above-mentioned cigarette machine noise, the utility model provides a method of making an uproar falls in cigarette machine produces the main enrichment district of noise source promptly the cigarette machine to the outside noise-absorbing structure that covers in order to inhale the sound wedge and constitute of cigarette machine fan-out tuyere section and absorb the noise that this section sent.
The utility model provides a device of making an uproar falls in cigarette machine, its technical scheme is:
a noise reduction device of a range hood comprises a covering part covered on an air duct system of the range hood, wherein the covering part is covered on a region between the butt joint of a range hood body and a fan and an air outlet of the fan; a closed cavity is formed between the covering part and the air outlet fan and the impeller of the cigarette machine, and a sound absorption material layer is arranged on the inner surface of the covering part.
Further, inhale the sound material layer and be inhaled the sound wedge, inhale the sound wedge and constitute by base and wedge portion, wedge portion from the top to with the part that the base contacted is the sectional area gradual change structure.
Furthermore, the covering part is of a wall-type structure with four enclosed sides, the lower end of the enclosed space is fixedly connected with the cigarette machine body, the upper end of the enclosed space is provided with a cover plate, and the cover plate is provided with a through hole matched with the air outlet.
Furthermore, the inner wall of the cover plate is provided with sound-absorbing wedges.
Furthermore, the wedge part is in a triangular prism shape with an isosceles triangle bottom surface, the base is square, and a rectangular surface corresponding to the triangular bevel edge of the wedge part is butted with the base.
Furthermore, the wedge parts are arranged on the inner wall of the covering part in a staggered array.
Furthermore, the ratio of the thickness of the base to the thickness of the covering part is 1:1, and the ratio of the isosceles triangle section bottom surface to the height of the wedge part is close to 2: 1.
Still further, the wedge part is of a quadrangular pyramid shape and/or a cone shape, and the cross section of the base is rectangular or circular matched with the bottom of the quadrangular pyramid shape and/or the cone shape of the wedge part.
Further, the wedge part and the covering part are both formed by foaming polyurethane.
A range hood comprising the noise reduction device of the range hood.
The technical scheme of the utility model can handle the noise in noise enrichment region, and noise performance index when making the lampblack absorber operation obtains increasing substantially, and is effectual to the noise absorption at cladding position, has given the user good use and has experienced. The utility model discloses a semi-closed sound-absorbing structure with wedge portion is located the neck of lampblack absorber air outlet fan position promptly, and is not direct contact with the oil smoke flue, consequently difficult by the cigarette machine greasy dirt cover, can so keep better sound absorption performance in longer cycle.
The sound-absorbing wedges which are arranged in a staggered mode have larger sound-absorbing surface area in a unit space and better noise reduction effect.
Drawings
FIG. 1 is a front view of a sound absorbing wedge;
FIG. 2 is a side view of the sound absorbing wedge of FIG. 1;
FIG. 3 is a top view of the sound absorbing wedge of FIG. 1;
fig. 4 is a perspective view of the noise reducing device of embodiment 2;
fig. 5 is a perspective view of the noise reducing device of embodiment 3;
FIG. 6 is a perspective view of a conical wedge of example 5;
FIG. 7 is a perspective view of a rectangular pyramid wedge of example 5;
FIG. 8 is a comparative example table for example 6;
FIG. 9 is a schematic view of the staggered sound absorbing wedges of example 3;
FIG. 10 is a schematic view of a prior art sound absorbing wedge;
reference numerals: cover 1, base 3, wedge portion 4, apron 5.
Detailed Description
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Example 1
The technical problem of excessive noise of the cigarette making machine is solved by a specific embodiment of the cigarette making machine. A noise reduction device of a cigarette machine comprises a covering part 1 which is covered on an air duct system of the cigarette machine, wherein the covering part 1 is covered on a region between the butt joint of a cigarette machine body and a fan and an air outlet of the fan; a closed cavity is formed among the covering part 1, the air outlet fan of the cigarette machine and the impeller, and a sound absorption material layer is arranged on the inner surface of the covering part 1.
Cladding formula structure is convenient for install, can absorb the regional scattering of cladding to noise all around, and the sound absorbing material layer is for inhaling the sound wedge.
The sound absorption wedge sound absorption mechanism is as follows: the sound absorbing structure is generally classified into a flat plate type structure and an impedance transition type structure. For an original flat plate type structure, according to the propagation theory of sound waves in a layered medium, the propagation coefficient of a sound absorption structure is generally calculated by a transmission matrix, and when the sound waves are propagated, only longitudinal waves need to be considered to be propagated in the sound absorption structure, namely, the sound pressure and the mass point vibration speed of the front and back interfaces of each layer are considered to be continuous. The wedge structure belongs to a section gradual change structure, the sectional area of the top end of the wedge structure is the minimum, the sectional area of the base is the maximum, and when sound waves are transmitted to the surface, the sound waves can be qualitatively transmitted in an impedance transition structure according to the characteristics of the wedge structure. Because the top end section of the wedge is a straight line, the characteristic impedance of the end face of the wedge is close to that of air, and along with the gradual increase of the sectional area from top to bottom, the characteristic impedance of the end face of the wedge structure is gradually close to that of the sound absorption material inside the wedge, so that the best sound absorption effect is achieved.
Example 2
The embodiment is further limited on the basis of embodiment 1, the sound absorption material layer is a sound absorption wedge, the sound absorption wedge is composed of a base 3 and a wedge part 4, and the part of the wedge part 4, which is in contact with the base, from the top end is of a sectional area gradually-changing structure. The covering part 1 is a wall-type structure with four enclosed sides, the lower end of the enclosed space is fixedly connected with the cigarette machine body, the upper end of the enclosed space is provided with a cover plate 5, and the cover plate 5 is provided with a through hole matched with the air outlet. The inner wall of the cover plate 5 is provided with sound-absorbing wedges.
Inhale its sectional area of sound wedge and belong to gradual change structure to because the arch, the area of contact increase of sound absorbing material and sound wave, when the contact of wedge unit and sound wave, the sound wave reachs and inhales the sound wedge point, because the sectional area of wedge point to base is in gradual change, impedance transition type structure promptly, thereby reach the effect of a characteristic impedance gradual change, make it become an efficient sound absorbing structure. Refer to fig. 4. The device is fixed on a range hood in a mode as shown in the figure, and the exhaust outlet section on the outer wall of the range hood covers the noise enrichment area.
Example 3
The embodiment is further limited on the basis of embodiment 1, the wedge part is in a triangular prism shape with an isosceles triangle bottom surface, the base is square, and a rectangular surface corresponding to the triangular bevel edge of the wedge part is butted with the base. Refer to fig. 1-3.
This example shows an arrangement of sound absorbing wedges as in example 3, with the wedges being arranged in a staggered array on the inner wall of the cover. Refer to fig. 5.
A comparative example is given about the staggered array, the sound absorbing plate arranged in a staggered mode and the sound absorbing plate arranged in a non-staggered mode are placed in front of a noise probe for testing, four times of data are summed, and the comparison shows that the noise reduction of the staggered arrangement is 8.1dBA, and the noise reduction of the non-staggered arrangement is 3.03 dBA.
The scaling formula for the size setting is given here: the ratio of the thickness of the base to the thickness of the covering part is 1:1, and the ratio of the isosceles triangle section bottom surface to the height of the wedge part is close to 2: 1.
A preferred embodiment of one dimension is listed here: the base thickness and the covering portion thickness are preferably 2mm, and the isosceles triangle section bottom surface and the height of the wedge portion are preferably 25mm and 13 mm.
The sound absorption structure can be an integrated structure and mainly comprises two parts, one part is a wedge part which is formed by foaming polyurethane and has the density of 20g/cm3, the wedge part is arranged in a staggered mode because the contact area between the wedge part and sound waves can be effectively increased, when the sound wave reaches the sound-absorbing wedge tip, since the sectional area from the wedge tip to the base is gradually changed, namely an impedance transition type structure, thereby achieving the effect of gradually changing the characteristic impedance, and enabling the sound absorption structure to become an efficient sound absorption structure, the other part of the sound absorption structure, namely the outer covering part, can be made of supporting rubber which can be made of polyurethane foam and has the thickness of 2mm, its main effect has three, and the first is as the base of wedge portion, and the second has certain supporting role to this semi-closed sound-absorbing structure, and the third can further absorb the sound and inhale the sound wedge and not absorb complete noise.
The reason why the misalignment arrangement is selected with reference to fig. 9 is as follows: firstly, as can be seen from the figure, with the staggered arrangement, each wedge unit increases two faces, so that the area contacting with the sound wave is increased, and in addition, with the non-staggered arrangement, as shown in fig. 9, the side cavity between the wedge and the wedge is a symmetrical structure, although the symmetrical structure can have a certain consumption effect on the sound wave through continuous reflection and absorption of the sound wave, the oscillation density of the sound wave in the cavity is kept constant, the cavity between the vertical face and the inclined face forms an asymmetrical structure cavity, and the density of the asymmetrical structure cavity for the oscillation of the sound wave in the cavity can be determined to be increased according to the sound velocity and density functions of the two-phase medium, so that the transmission attenuation of the sound wave in the sound absorption structure can be increased, and compared with fig. 10, the surface area of the sound absorption material is increased to obtain good sound absorption performance.
Example 4
The present embodiment is a parallel embodiment of embodiment 3, and further defines two other structures of the sound-absorbing wedge, the wedge portion is a quadrangular pyramid and/or a cone, and the cross section of the base 3 is a rectangle or a circle matched with the bottom of the quadrangular pyramid and/or the cone of the wedge portion 4. Refer to fig. 6 and 7.
The two figures are superior to the prior art as alternatives, but are inferior to the best embodiment, see example 6 for comparison of specific properties.
Example 5
The embodiment gives a specific example of a material for the noise reduction device of the cigarette making machine: the wedge portion 4 and the covering portion 1 are formed by foaming polyurethane. The material can absorb sound well. The utility model discloses sound absorbing structure first selects polyurethane, also can choose the porous sound absorbing material of other forms for use.
Simultaneously this embodiment has also proposed the lampblack absorber of the device of making an uproar falls in above-mentioned cigarette machine. The air outlet of the range hood is covered with a covering part, and the inner wall of the covering part is provided with a sound-absorbing wedge. And because the structure is formed by foaming polyurethane, the polyurethane is a viscoelastic material with high loss coefficient, the reflected wave is very weak, and simultaneously, because the sound absorption coefficient of the polyurethane foam material is 0.7, the sound wave is transmitted and attenuated greatly in the sound absorption structure.
The noise generated when the range hood operates mainly comprises the running noise of an internal fan and the pneumatic noise at the air outlet of the air duct system, and when the noise is transmitted to the periphery, the air existing in tiny holes in the foamed polyurethane can vibrate, the internal structures of the foamed polyurethane can vibrate and rub with each other, and a part of sound energy is converted into heat energy.
Example 6
This example provides a data table of comparative examples, and from the viewpoint of sound absorption performance at low frequencies, the sound absorption coefficient of the dislocated wedge type is the best, and compared with the sound absorption coefficient of the non-dislocated wedge type, the main advantage is that the sound absorption at low frequencies is performed, and then the sound absorption coefficient of the dislocated wedge type is the pyramid type and the worst cone type. Refer to fig. 8.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.
Claims (11)
1. The noise reduction device for the range hood is characterized by comprising a covering part (1) covered on an air duct system of the range hood, wherein the covering part (1) is covered on a region between the butt joint of a range hood body and a fan and an air outlet of the fan; a closed cavity is formed between the covering part (1) and the air outlet fan and the impeller of the cigarette machine, and a sound absorption material layer is arranged on the inner surface of the covering part.
2. The noise reduction device of the cigarette machine according to the claim 1, characterized in that the sound absorption material layer is a sound absorption wedge, the sound absorption wedge is composed of a base (3) and a wedge part (4), and the wedge part (4) is a structure with gradually changed sectional area from the top end to the part contacted with the base (3).
3. The noise reduction device of the cigarette machine according to claim 2, wherein the covering part (1) is a wall-type structure with four enclosed sides, the lower end of the enclosed space is fixedly connected with the cigarette machine body, the upper end of the enclosed space is provided with a cover plate (5), and the cover plate (5) is provided with a through hole matched with the air outlet.
4. The noise reducer according to the claim 3, characterized in that the inner wall of the cover plate (5) is provided with the sound-absorbing wedges.
5. The noise reduction device of the cigarette machine according to the claim 2, characterized in that the wedge part (4) is triangular prism with isosceles triangle bottom surface, the base (3) is square, and the rectangular surface corresponding to the triangle bevel edge of the wedge part (4) is butted with the base (3).
6. A noise reducing device for a cigarette machine according to claim 5, characterized in that the wedges (4) are arranged on the inner wall of the cover (1) in a staggered array.
7. The noise reduction device of the cigarette machine according to the claim 6, characterized in that the ratio of the thickness of the base (3) to the thickness of the covering part (1) is 1:1, and the ratio of the isosceles triangle section bottom surface to the height of the wedge part (4) is close to 2: 1.
8. The noise reduction device of the cigarette machine according to the claim 2, characterized in that the wedge part (4) is of a quadrangular pyramid and/or a cone type, and the cross section of the base (3) is of a rectangle or a circle matched with the bottom of the quadrangular pyramid and/or the cone type of the wedge part (4).
9. The noise reduction device of a cigarette machine according to any of the claims 2-8, characterized in that the wedge part (4) and the cover part (1) are made of polyurethane foam.
10. A cigarette making machine comprising the cigarette making machine noise reducing device of claim 1.
11. A cigarette making machine comprising the cigarette making machine noise reducing device of claim 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921249986.0U CN210599588U (en) | 2019-08-05 | 2019-08-05 | Smoke machine noise reduction device and smoke machine applying same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921249986.0U CN210599588U (en) | 2019-08-05 | 2019-08-05 | Smoke machine noise reduction device and smoke machine applying same |
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| CN210599588U true CN210599588U (en) | 2020-05-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374935A (en) * | 2019-08-05 | 2019-10-25 | 杭州老板电器股份有限公司 | A kind of smoke machine of smoke machine noise-reduction method, the device and application device |
| CN112484114A (en) * | 2020-11-16 | 2021-03-12 | 宁波方太厨具有限公司 | Noise reduction device, range hood applying noise reduction device and control method of range hood |
| CN112484113A (en) * | 2020-11-16 | 2021-03-12 | 宁波方太厨具有限公司 | Noise reduction device, range hood applying noise reduction device and control method of range hood |
-
2019
- 2019-08-05 CN CN201921249986.0U patent/CN210599588U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374935A (en) * | 2019-08-05 | 2019-10-25 | 杭州老板电器股份有限公司 | A kind of smoke machine of smoke machine noise-reduction method, the device and application device |
| CN112484114A (en) * | 2020-11-16 | 2021-03-12 | 宁波方太厨具有限公司 | Noise reduction device, range hood applying noise reduction device and control method of range hood |
| CN112484113A (en) * | 2020-11-16 | 2021-03-12 | 宁波方太厨具有限公司 | Noise reduction device, range hood applying noise reduction device and control method of range hood |
| CN112484114B (en) * | 2020-11-16 | 2022-02-18 | 宁波方太厨具有限公司 | Noise reduction device, range hood applying noise reduction device and control method of range hood |
| CN112484113B (en) * | 2020-11-16 | 2022-02-18 | 宁波方太厨具有限公司 | Noise reduction device, range hood applying noise reduction device and control method of range hood |
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