A muffler device suitable for integrated stove

Abstract

The present invention discloses a muffler device suitable for an integrated stove, comprising a first muffler sheet arranged on both sides of an air inlet of the integrated stove, a second muffler sheet arranged on both sides of a volute of a fan of the integrated stove, and a third muffler sheet arranged at a back plate in a fan compartment of the integrated stove. The upper parts of the first muffler sheet and the second muffler sheet both adopt a micro-perforated plate resonance sound absorption structure with a built-in multi-slit resonance cavity, and the lower part of the second muffler sheet and the third muffler sheet both adopt a micro-perforated plate resonance sound absorption structure. The present invention makes full use of the oil fume air inlet of the integrated stove and the space of the fan compartment, while achieving efficient muffler, maintaining the original oil fume absorption effect of the integrated stove, being resistant to high temperatures, easy to clean, and having good commercial application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of sound elimination, and in particular to a sound elimination device suitable for an integrated stove. Background Art

[0002] Integrated stoves are kitchen appliances that integrate multiple kitchen appliances such as range hoods, gas stoves and ovens. Integrated stoves are accompanied by noise when in operation, causing subjective annoyance to operators in front of the stove. The main noise source of integrated stoves is the range hood, of which the fan is the core power component of the range hood. The air volume and noise of the fan directly determine the quality of the range hood. Fan noise mainly includes airflow noise, mechanical noise and electromagnetic noise. There are two general ways to reduce the airflow noise of the fan: one is to optimize the structural parameters of key components such as impellers, volutes, and volutes; the other is to use sound absorption, sound insulation, noise elimination, damping vibration reduction and vibration isolation technologies in areas such as the fan air inlet channel, fan compartment, and exhaust channel.

[0003] The patent specification with the publication number CN109340856A discloses a muffler sheet arranged outside the air inlet of the integrated stove, on which the muffler unit is arranged in a honeycomb shape, and a resonance cylinder is arranged inside the muffler unit, which is connected to the outside through a connecting pipe and is connected to the air inlet of the integrated stove through an air flow hole. However, the resonant sound absorption structure usually requires a larger cavity, and the muffler sheet is arranged outside the air inlet of the integrated stove, which affects the appearance of the integrated stove and occupies the operating space. In addition, the oil fume in the patent enters the air inlet of the integrated stove after passing through the muffler sheet, which increases the air inlet resistance and affects the oil fume absorption effect. The patent specification with the publication number CN110273859A discloses a noise reduction device installed at the air outlet of the integrated stove volute, which reduces the wind speed of the volute outlet through the blocking effect of the windward wall on the airflow, so as to reduce the airflow noise at the exhaust port. However, the patent only performs noise reduction on the airflow at the exhaust port, and it is generally believed that the airflow noise at the air inlet has a greater impact on the indoor sound environment. The patent specification with announcement number CN105387497B discloses a low-noise and environmentally friendly integrated stove. First, a water cooling device is set in the shell of the integrated stove. The oil fume is cooled and separated by the water cooling device before entering the ventilation duct to reduce the resistance of the fan operation. Second, the sound insulation felt is covered on the outside of the air inlet. However, the implementation method of this patent is relatively complicated, requiring the modification of the internal structure of the integrated stove, and the specific structure of the sound insulation felt is not given. The patent specification with announcement number CN210977916U discloses a muffler arranged on the top of the fan compartment of the integrated stove. The muffler includes a perforated plate close to the fan side and a cavity behind the plate, and the cavity is filled with sound-absorbing cotton. However, the perforated plate of the muffler does not directly contact the oil fume in the integrated stove, and there are fewer sound waves incident from the perforated plate to the sound-absorbing cotton. In addition, the ordinary perforated plate has the disadvantage of a narrow sound absorption bandwidth compared to the micro-perforated plate.

[0004] It can be seen that in the disclosed integrated stove noise reduction patents, the silencer installed in the air inlet channel will affect the effective flow area of ​​the integrated stove and affect the oil fume absorption performance. At the same time, these patents do not design the silencer structure according to the structural characteristics and noise characteristics of the integrated stove, and the actual use value on the integrated stove is low. Summary of the invention

[0005] In view of the deficiencies in the prior art, an object of the present invention is to provide a silencer device suitable for an integrated stove, which can achieve efficient silencer while maintaining the original fume absorption effect of the integrated stove.

[0006] A muffler device suitable for an integrated stove, comprising:

[0007] A first muffler sheet is arranged on both sides of the air inlet of the integrated stove, the first muffler sheet includes a first closed shell, a first cavity is formed in the first closed shell, the surface of the first closed shell that is in direct contact with the oil smoke is a first micro-perforated plate, a plurality of first semi-closed shells arranged at intervals and with openings facing away from / towards the first micro-perforated plate are arranged in the first cavity along a direction perpendicular to the air inlet, a first micro-slit is formed between adjacent first semi-closed shells, and a first closed plate for forming a first resonance cavity is arranged on the side of the plurality of first semi-closed shells away from / close to the first micro-perforated plate;

[0008] and / or a second muffler sheet arranged on both sides of the integrated stove fan volute, the second muffler sheet comprising an upper half and a lower half, the upper half comprising a second closed shell, a second cavity being formed in the second closed shell, a surface of the second closed shell in direct contact with the oil fume being a second micro-perforated plate, a plurality of second semi-closed shells arranged at intervals and opening toward the second micro-perforated plate being arranged in the second cavity along the height direction of the second muffler sheet, a second micro-slit being formed between adjacent second semi-closed shells, and a plurality of second semi-closed shells being arranged near the second micro-perforated plate side to form a second resonant cavity; the lower half comprising a third closed shell, a third cavity being formed in the third closed shell, and a surface of the third closed shell in direct contact with the oil fume being a third micro-perforated plate;

[0009] And / or a third sound-absorbing plate arranged at the back plate in the fan compartment of the integrated stove, the third sound-absorbing plate includes a fourth micro-perforated plate parallel to the back plate and in direct contact with the oil fume, and a fourth cavity is formed between the fourth micro-perforated plate and the back plate.

[0010] In this solution, the first muffler fits tightly with the arc-shaped air inlet duct on the upper part of the integrated stove, and is installed on both sides of the oil fume air inlet duct without reducing the effective flow area of ​​the integrated stove. The oil fume air inlet duct is similar to a resistant muffler, and the installation area is its expansion chamber. Due to the extremely small expansion ratio, it has almost no muffler effect. After installing the first muffler, the sudden change in the channel cross section can be partially eliminated to reduce the air inlet resistance.

[0011] Integrated stoves radiate broadband noise dominated by medium and low frequency sound energy, and have no obvious tonal characteristics. According to the spectral characteristics of the integrated stove noise, the structures of various muffler plates are designed, wherein the first muffler plate and the upper part of the second muffler plate both adopt a micro-perforated plate resonance sound absorption structure with a built-in multi-slit resonance cavity, and the lower part of the second muffler plate and the third muffler plate both adopt a micro-perforated plate resonance sound absorption structure, and its structural parameters include the aperture, hole spacing, number of holes, plate thickness and cavity thickness of the micro-perforated plate resonance sound absorption structure, and the micro-slit width, micro-slit length, micro-slit depth and cavity thickness of the built-in multi-slit resonance cavity.

[0012] In addition, when the first semi-enclosed shell of the first muffler with built-in multi-slit resonance cavity opens toward the first micro-perforated plate, the resonance absorption frequency can be further moved toward the low frequency direction.

[0013] Preferably, the length of the second micro-slit in the second sound-absorbing sheet varies in steps. On the one hand, the space of the fan compartment of the integrated stove can be utilized to the maximum extent; on the other hand, it is equivalent to connecting multiple single-slit resonance cavities with different resonance absorption peaks in parallel to achieve broadband sound absorption.

[0014] Further preferably, the resonant absorption frequency of the single slit resonant cavity is calculated by the following formula:

[0015]

[0016] Where: f0 is the resonance absorption frequency; c is the speed of sound; d is the micro-slit width; b is the micro-slit spacing; L is the micro-slit length; t is the micro-slit depth; D is the cavity thickness; l e is the micro-slit depth correction, in is the ellipticity, is the total elliptic integral.

[0017] The sound waves in the integrated stove airflow channel can be incident from the micro-perforated plate side of the second muffler sheet into the micro-perforated resonance cavity (the second cavity), and further diffract from the four sides of the cavity into the built-in multi-slit resonance cavity. Sound waves with the same frequency entering the micro-slits along different paths have different sound paths, and are prone to consume sound energy through interference.

[0018] Preferably, the number of corresponding second micro-slits in the second muffler sheets on both sides of the integrated stove fan volute is not equal, that is, the second muffler sheets on both sides are not completely symmetrically arranged.

[0019] Preferably, the second closed shell and the third closed shell are integrally arranged, and the interior is separated by a baffle.

[0020] Preferably, the second silencer sheet is in an arc shape close to the integrated stove fan volute side and is consistent with the contour of the volute.

[0021] Preferably, the first, second and third silencer plates are provided with oil drain holes at the bottom, and the oil drain holes are connected to the oil storage tank of the integrated stove to avoid oil fume accumulation and blockage in the silencer device, thereby ensuring the silencer effect and service life of the silencer device.

[0022] Preferably, the first muffler sheet, the second muffler sheet and the third muffler sheet are all made of materials that are resistant to oil smoke and high temperature, so that the muffler device is suitable for the high temperature environment when heating components such as ovens and gas stoves in integrated stoves are in operation.

[0023] Beneficial effects of the present invention:

[0024] (1) The present invention fully utilizes the oil fume air inlet duct and the fan compartment space of the integrated stove, and achieves high-performance noise reduction without reducing the effective flow area of ​​the integrated stove.

[0025] (2) According to the noise spectrum characteristics of the integrated stove, the present invention sets a multi-slit resonance cavity with gradient micro-slit lengths in the micro-perforated plate resonant sound absorption structure, which can effectively broaden the sound absorption frequency band.

[0026] (3) The present invention is easy to install and disassemble, resistant to high temperatures, easy to clean, and has good commercial application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall installation of the integrated stove muffler device of the present invention;

[0028] Figure 2 is a cross-sectional view of the first sound-absorbing sheet of the present invention;

[0029] Figure 3 It is a schematic diagram of the internal structure of the second muffler sheet of the present invention;

[0030] Figure 4 is a cross-sectional view of a second sound-absorbing sheet of the present invention;

[0031] Figure 5 It is a front view of a third sound-absorbing sheet of the present invention;

[0032] Figure 6 It is a side view of the third sound-absorbing plate of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figure 1As shown, a silencer device suitable for an integrated stove comprises a first silencer plate 4 arranged on both sides of an air inlet 1 of the integrated stove, a second silencer plate 5 arranged on both sides of a fan volute 2 of the integrated stove, and a third silencer plate 6 arranged at a back plate 3 inside a fan compartment of the integrated stove.

[0035] like Figure 2 As shown, the first silencer 4 is a micro-perforated plate resonance sound absorption structure with a built-in multi-slit resonance cavity, specifically including a first closed shell 41, a first cavity 411 is formed in the first closed shell 41, the surface of the first closed shell 41 that is in direct contact with the oil fume is a first micro-perforated plate 412, and a plurality of first semi-closed shells 42 that are arranged at intervals and have openings facing away from the first micro-perforated plate 412 are arranged in the first cavity 411 along a direction perpendicular to the air inlet 1, a first micro-slit 421 is formed between adjacent first semi-closed shells 42, and a first closed plate 43 is arranged on the side of the plurality of first semi-closed shells 42 away from the first micro-perforated plate 412 to form a first resonance cavity 431.

[0036] Of course, the built-in multi-slit resonance cavity can also be rotated 180 degrees to further move the resonance absorption frequency toward the low frequency direction.

[0037] like Figure 3 and 4 As shown, the second muffler sheet 5 is two incompletely symmetrical pieces, and the second muffler sheet 5 is divided into an upper half and a lower half from top to bottom; the upper half is a micro-perforated plate resonance sound absorption structure with a built-in multi-slit resonance cavity, specifically including a second closed shell 51, a second cavity 511 is formed in the second closed shell 51, and the surface of the second closed shell 51 that is in direct contact with the oil fume is a second micro-perforated plate 512, and a plurality of second semi-closed shells 52 arranged at intervals and opening toward the second micro-perforated plate 512 are arranged in the second cavity 511 along the height direction of the second muffler sheet 5, and a second micro-slit 521 is formed between adjacent second semi-closed shells 52, and a plurality of second semi-closed shells 52 are provided with second closed plates 53 near the second micro-perforated plate 512 to form a second resonance 531;

[0038] The lower part is a micro-perforated plate resonance sound absorption structure, which specifically includes a third closed shell 54, in which a third cavity 541 is formed, and the surface of the third closed shell 54 that is in direct contact with the oil fume is a third micro-perforated plate 542; in this embodiment, the second closed shell 51 and the third closed shell 54 are integrally arranged, and the interior is separated by a baffle to form a second cavity 511 and a third cavity 541.

[0039] In this embodiment, the length of the second micro-slit 521 in the second muffler sheet 5 changes in steps to introduce a slit resonance cavity with different resonance absorption peaks; wherein the resonance absorption frequency of a single slit resonance cavity can be calculated by the following formula:

[0040]

[0041] Where: f0 is the resonance absorption frequency; c is the speed of sound; d is the micro-slit width; b is the micro-slit spacing; L is the micro-slit length; t is the micro-slit depth; D is the cavity thickness; l e is the micro-slit depth correction, in is the ellipticity, is the total elliptic integral.

[0042] In this embodiment, the number of corresponding second micro-slots 521 in the second silencer plate 5 on both sides of the integrated stove fan volute 2 is not equal to form an incompletely symmetrical structure; in addition, the second silencer plate 5 close to the integrated stove fan volute 2 is in an arc shape consistent with the contour of the volute 2 to ensure that no more space is occupied.

[0043] like Figure 5 and 6 As shown, the third muffler sheet 6 includes a fourth micro-perforated plate 61 disposed in the integrated stove fan compartment and in direct contact with the oil fume, the fourth micro-perforated plate 61 is parallel to the back plate 3 and forms a fourth cavity 62 with the back plate 3. The fourth micro-perforated plate 61 and the back plate 3 together form a micro-perforated plate resonance sound absorption structure.

[0044] It should be noted that the first sound-absorbing sheet 4, the second sound-absorbing sheet 5 and the third sound-absorbing sheet 6 can be used at the same time or partially.

[0045] In this embodiment, the first silencer plate 4, the second silencer plate 5 and the third silencer plate 6 are all provided with oil drain holes at the bottom, and the oil drain holes are connected to the oil storage tank of the integrated stove; and the first silencer plate 4, the second silencer plate 5 and the third silencer plate 6 are all made of materials that are resistant to oil smoke and high temperature.

[0046] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A muffler device suitable for an integrated stove, characterized in that: include: A first muffler sheet is arranged on both sides of the air inlet of the integrated stove, the first muffler sheet includes a first closed shell, a first cavity is formed in the first closed shell, the surface of the first closed shell that is in direct contact with the oil smoke is a first micro-perforated plate, a plurality of first semi-closed shells arranged at intervals and with openings facing away from / towards the first micro-perforated plate are arranged in the first cavity along a direction perpendicular to the air inlet, a first micro-slit is formed between adjacent first semi-closed shells, and a first closed plate for forming a first resonance cavity is arranged on the side of the plurality of first semi-closed shells away from / close to the first micro-perforated plate; And / or a second silencer plate arranged on both sides of the integrated stove fan volute, the second silencer plate includes an upper part and a lower part, the upper part includes a second closed shell, a second cavity is formed in the second closed shell, the surface of the second closed shell that is in direct contact with the oil fume is a second micro-perforated plate, and a plurality of second semi-closed shells arranged at intervals and opening toward the second micro-perforated plate are arranged in the second cavity along the height direction of the second silencer plate, a second micro-gap is formed between adjacent second semi-closed shells, and a plurality of second semi-closed shells are provided with a second closed plate near the second micro-perforated plate to form a second resonance cavity; the lower part includes a third closed shell, a third cavity is formed in the third closed shell, and the surface of the third closed shell that is in direct contact with the oil fume is the third micro-perforated plate.

2. The muffler device for an integrated stove according to claim 1, characterized in that: It also includes a third sound-absorbing sheet arranged at the back plate in the integrated stove fan compartment, and the third sound-absorbing sheet includes a fourth micro-perforated plate parallel to the back plate and in direct contact with the oil smoke, and a fourth cavity is formed between the fourth micro-perforated plate and the back plate.

3. The muffler device for integrated stoves according to claim 1, characterized in that: The length of the second micro-slit in the second sound-absorbing plate changes in steps.

4. The muffler device suitable for an integrated stove according to claim 1 or 3, characterized in that: The number of corresponding second micro-slits in the second silencer plates on both sides of the integrated stove fan volute is not equal.

5. The muffler device suitable for an integrated stove according to claim 1, characterized in that: The second closed shell and the third closed shell are integrally arranged, and the interior is separated by a baffle.

6. The muffler device suitable for an integrated stove according to claim 1, characterized in that: The second silencer sheet is in an arc shape close to the integrated stove fan volute side and is consistent with the contour of the volute.

7. The muffler device suitable for an integrated stove according to claim 1 or 3, characterized in that: The step-wise change in the length of the second micro-slit in the second muffler is equivalent to connecting a plurality of single-slit resonant cavities with different resonant absorption peaks in parallel, and the resonant absorption frequency of the single-slit resonant cavity is calculated by the following formula: Where: f0 is the resonance absorption frequency; c is the speed of sound; d is the micro-slit width; b is the micro-slit spacing; L is the micro-slit length; t is the micro-slit depth; D is the cavity thickness; l e is the micro-slit depth correction, in is the ellipticity, is the total elliptic integral.

8. The muffler device suitable for an integrated stove according to claim 2, characterized in that: The first sound-absorbing plate, the second sound-absorbing plate and the third sound-absorbing plate are all provided with oil drain holes at the bottom, and the oil drain holes are connected to the oil storage tank of the integrated stove.

9. The muffler device for integrated stoves according to claim 2, characterized in that: The first sound-absorbing sheet, the second sound-absorbing sheet and the third sound-absorbing sheet are all made of materials that are resistant to oil smoke and high temperature.

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