CN114688736A - Noise reduction device and gas water heater - Google Patents

Abstract

The application relates to the technical field of gas appliances, and provides a noise reduction device and a gas water heater. Among the above-mentioned device of making an uproar falls, the device of making an uproar falls includes the casing at least, the frequency characteristic of noise produces when according to gas heater air inlet, set up first amortization spare in the casing along the air inlet direction, second amortization spare and second amortization spare, be formed with the first amortization passageway that communicates in proper order respectively, second amortization passageway and third amortization passageway, set up the amortization passageway through the segmentation, and combine the first clearance passageway that sets up, second clearance passageway, porous sound-absorbing layer and sound absorption wedge, on the angle of the noise of improving resonant frequency and successive layer absorption different frequencies, make the air current noise loop through first amortization passageway, behind second amortization passageway and the third amortization passageway, layer upon layer amortization attenuates gradually, thereby the air current noise has been reduced, promote the comfort level that the user used.

Description

Noise reduction device and gas water heater

Technical Field

The application relates to the technical field of combustion appliances, in particular to a noise reduction device and a gas water heater.

Background

In the related technology, when the gas water heater enters air, high-speed airflow can be generated in the air inlet channel, and friction and resistance are generated between the airflow and the air inlet channel due to relative movement, so that the airflow is violently vibrated, and then noise is generated.

Disclosure of Invention

Therefore, there is a need for a noise reduction device and a gas water heater to reduce the noise generated when the gas water heater enters the air.

According to an aspect of the present application, the present application provides a noise reduction device for an air inlet of a gas water heater, including:

the air conditioner comprises a shell, a fan and a control device, wherein the shell is provided with an accommodating chamber, one end of the shell is provided with an air inlet, the other end of the shell is provided with an air outlet, and the air inlet and the air outlet are respectively communicated with the accommodating chamber; and

the first silencing piece, the second silencing piece and the third silencing piece are sequentially arranged in the accommodating cavity along the air inlet direction, a first silencing channel communicated with the air inlet is formed in the first silencing piece, a second silencing channel is formed in the second silencing piece, a third silencing channel communicated with the air outlet is formed in the third silencing piece, and the first silencing channel, the second silencing channel and the third silencing channel are sequentially communicated to form an air inlet channel;

along the air inlet direction, the cross-sectional area of the second silencing channel is larger than that of the first silencing channel and that of the third silencing channel, and stepped surfaces are respectively formed at the joint of the first silencing channel and the second silencing channel and at the joint of the second silencing channel and the third silencing channel;

a first gap channel is defined between the first silencing piece and the shell, and a second gap channel is defined between the second silencing piece and the shell;

the first silencing piece is provided with a plurality of first through holes for communicating the first silencing channel with the first gap channel, and the second silencing piece is provided with a plurality of second through holes for communicating the second silencing channel with the second gap channel.

Among the above-mentioned noise reduction device, this noise reduction device includes the casing at least, the frequency characteristic of noise production when according to gas heater air inlet, set up first amortization piece in the casing along the air inlet direction, second amortization piece and second amortization piece, be formed with the first amortization passageway that communicates in proper order respectively, second amortization passageway and third amortization passageway, because the cross-sectional area of second amortization passageway is greater than the cross-sectional area of first amortization passageway and the cross-sectional area of third amortization passageway, and the junction of first amortization passageway and second amortization passageway, the junction of second amortization passageway and third amortization passageway is formed with the step face respectively, make this department be the cross section of sudden change, the noise can take place the reflection and attenuate in the sudden change department. Therefore, the first silencing channel can reduce the noise of a high frequency band, the second silencing channel can reduce the noise of a medium and low frequency band, and the third silencing channel can further reduce the noise of the low frequency band. Simultaneously, owing to define out first clearance passageway between first amortization piece and the casing, define out second clearance passageway between second amortization piece and the casing, combine aforementioned structure, first clearance passageway can further strengthen the subduction to the noise of high frequency channel in the first amortization passageway, and the subduction to the noise of low frequency channel in the second amortization passageway can further be strengthened to the second clearance passageway. Therefore, airflow noise generated when the gas water heater is used for air intake is subjected to layer-by-layer noise reduction and gradual attenuation, so that the noise is reduced, and the use comfort of a user is improved.

In one embodiment, the noise reducer further comprises a porous sound absorbing layer disposed between the first sound attenuating element and the housing;

the first gap channel is defined between the porous sound absorption layer and the first silencing piece. Therefore, due to the arrangement of the porous sound absorption layer, the sound resistance is increased, and the frequency band of noise which can be absorbed by the first silencing channel structurally is wider.

In one embodiment, the noise reducer further comprises a plurality of sound absorbing wedges disposed within the third sound attenuating channel;

the sound-absorbing wedge is provided with a base part and a wedge part opposite to the base part, the base part is arranged on the side wall of the third sound-absorbing channel, and the wedge part extends away from the side wall. So, through setting up the wedge that absorbs sound for the acoustic impedance between air and sound absorbent realizes gradual transition, obtains good impedance matching and sound absorption effect.

In one embodiment, in the extending direction of the split part, the length of the split part is L1, and the length of the base part is L2;

wherein the ratio of L1 to L2 is 4. Therefore, the rigidity of the framework of the wedge absorber can be ensured, and the sound absorption performance is improved.

In one embodiment, a plurality of said sound absorbing wedges are arranged around the side wall of said third sound attenuating channel. Thus, the effect of absorbing low-frequency noise in the third muffling channel is further improved.

In one embodiment, the sound absorbing wedges comprise flat-headed wedges. Thus, the space in the third silencing channel can be saved while a better absorption effect is realized.

In one embodiment, the third sound attenuating element is made of a porous sound absorbing material. Thus, the noise absorption effect can be further improved.

In one embodiment, the aperture of the first through hole is d1, the thickness of the first noise damping member is t1, the thickness of the first gap channel is h1, and the ratio of the sum of the areas of the first through holes to the area of the first noise damping member is P1, which satisfies the following conditions:

3mm≤d1≤3.5mm；

1mm≤t1≤1.5mm；

5mm≤h1≤10mm；

0.04≤P1≤0.05。

thus, the frequency band of the noise that can be absorbed by the first silencing passage can be made wider structurally.

In one embodiment, the aperture of the second through hole is d2, the thickness of the second noise suppressor is t2, the thickness of the second gap channel is h2, and the ratio of the sum of the areas of the second through holes to the area of the second noise suppressor is P2, which satisfies the following conditions:

2.5mm≤d2≤3mm；

2mm≤t2≤3mm；

30mm≤h2≤35mm；

0.025≤P2≤0.03。

thus, the second silencing passage can better absorb the medium-frequency noise structurally.

In one embodiment, a plurality of the first via holes are arranged such that a first unit pattern including one of a triangle and a rectangle is repeatedly formed; and/or

The plurality of second through holes are arranged such that a second unit pattern including one of a triangle and a rectangle is repeatedly formed. In this way, the required resonance frequency can be achieved for better noise absorption.

In one embodiment, the extending directions of the first through holes are parallel to each other; and/or

The extending directions of the second through holes are parallel to each other. In this way, the required resonance frequency can be achieved for better noise absorption.

In one embodiment, the noise reduction device further comprises a flow guide channel connected between the air inlet and the first silencing channel;

along the air inlet direction, the cross-sectional area of water conservancy diversion passageway reduces. So, be convenient for with the air water conservancy diversion to in the first amortization passageway.

In one embodiment, the first silencing piece and the shell are of an integral structure or a split structure. Thus, the manufacturing or installation is convenient according to the requirement.

In one embodiment, the noise reducer further comprises a bellows;

the air outlet is communicated with the air inlet of the gas water heater by means of the corrugated pipe. Therefore, the generation of a fluid boundary layer can be destroyed, and the air inlet resistance is reduced.

According to another aspect of the present application, the present application provides a gas water heater, including the above noise reduction device, the noise reduction device is located gas water heater's air inlet department. So, can reduce the produced noise of gas heater when the air inlet, improve user's use and experienced.

Additional aspects and advantages of embodiments of the present application 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 embodiments of the present application.

Drawings

FIG. 1 is an exploded view of a noise reducer according to an embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional view of a noise reducer according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of an acoustical wedge in one embodiment of an embodiment of the present application;

FIG. 4 is a schematic diagram of a first via arrangement in one implementation of an embodiment of the present application;

FIG. 5 is a schematic diagram of a first via arrangement in another implementation of an embodiment of the present application;

fig. 6 is a schematic diagram of a first arrangement of through holes in yet another implementation manner of the example of the application.

Notation of elements for simplicity:

the shell 100, the air inlet 110 and the air outlet 120;

the first silencing piece 200, the first silencing passage 201, the first gap passage 202, the flow guide passage 203 and the first through hole 210;

a second silencer 300, a second silencing passage 301, a second gap passage 302, a second through hole 310;

a third sound deadening member 400, a third sound deadening channel 401, a wedge 410, a base 411, and a wedge 412;

a porous sound absorbing layer 500;

a bellows 600;

the air inlet direction x.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth to provide a thorough understanding of embodiments of the present application. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. The embodiments of this application can be implemented in many different ways than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the invention and therefore the embodiments of this application are not limited to the specific embodiments disclosed below.

It is to be understood that the terms "first," "second," and the like as used herein may be used herein to describe various terms of art, and are not to be construed as indicating or implying relative importance or implicit ly indicating a number of technical features being indicated. However, these terms are not intended to be limiting unless specifically stated. These terms are only used to distinguish one term from another. For example, the first, second and third muffling elements are distinct muffling elements without departing from the scope of the present application. In the description of the embodiments of the present application, "a plurality" or "a plurality" means at least two, e.g., two, three, etc., unless specifically defined otherwise.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, a first feature "on" or "under" a second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may mean that the first feature is directly above or obliquely above the second feature, or that only the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely below the second feature, or may simply mean that the first feature is at a lesser level than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

In the related art, when a gas water heater is used for air inlet, after external air flow enters a gas mixing device through an air inlet pipe of a fan, the external air flow is mixed with gas with a proportion adjusted by a gas proportion valve in a premixing cavity at an air inlet of the fan. Then, the fan blows the obtained air-fuel mixture into the combustor for ignition and combustion. In the process, high-speed airflow can be generated in the air inlet channel, and friction and resistance are generated between the airflow and the air inlet channel due to relative movement, so that the airflow is violently vibrated, and noise is generated. The fan noise frequency which has great influence on the human living environment of the gas water heater is generally 650-2000 Hz, the noise with the frequency between 1000-2000 Hz is high-frequency noise, the noise with the frequency between 400-1000 Hz is intermediate-frequency noise, and the noise with the frequency between 20 Hz-400 Hz is low-frequency noise.

The inventor of the application notices that outside air is sucked into the premixing cavity through the high-speed fan of 7000-10000 r/min, the air and the air inlet channel can generate violent collision, and if the frequency is overlapped with the natural frequency of the whole gas water heater, a resonance phenomenon can be generated, and then larger noise is emitted. In order to prevent the occurrence of resonance, the inventors have studied and found that the resonance frequency can be improved by providing an air layer, thereby achieving the purpose of noise reduction.

Based on above consideration, in order to reduce the noise that produces when gas heater advances air, the inventor has designed a structure of making an uproar falls through the deep study, sets up the amortization structure of isostructure through the segmentation to correspond simultaneously and set up the air bed, not only can make a uproar fall in the segmentation to the noise of different frequencies, can also improve resonance frequency through widening the noise frequency bandwidth that the amortization passageway that corresponds can absorb, further fall the noise. The noise reduction device provided by the embodiments of the present application is described below with reference to some embodiments.

FIG. 1 is a schematic diagram illustrating an explosive structure of a noise reduction device in an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of a noise reducer in an embodiment of the present application; for convenience of explanation, only portions related to the embodiments of the present application are shown.

Referring to fig. 1 and 2, an embodiment of the present application provides a noise reduction device for an intake of a gas water heater. The noise reducing device includes a housing 100, a first silencer 200, a second silencer 300, and a third silencer 400. The housing 100 has an accommodating chamber, an air inlet 110 is formed at one end of the housing 100, an air outlet 120 is formed at the other end of the housing 100, and the air inlet 110 and the air outlet 120 are respectively communicated with the accommodating chamber. The first silencing piece 200, the second silencing piece 300 and the third silencing piece 400 are sequentially arranged in the accommodating chamber along the air inlet direction x. A first silencing channel 201 communicated with the air inlet 110 is formed in the first silencing piece 200, a second silencing channel 301 is formed in the second silencing piece 300, a third silencing channel 401 communicated with the air outlet 120 is formed in the third silencing piece 400, and the first silencing channel 201, the second silencing channel 301 and the third silencing channel 401 are sequentially communicated to form an air inlet channel. That is, the airflow passes through the air inlet 110, the first silencing passage 201, the second silencing passage 301, the third silencing passage 401 and the air outlet 120 in sequence, and then enters the air inlet of the gas water heater.

Along the air inlet direction x, the cross-sectional area of the second silencing passage 301 is larger than the cross-sectional area of the first silencing passage 201 and the cross-sectional area of the third silencing passage 401, and step surfaces are respectively formed at the joint of the first silencing passage 201 and the second silencing passage 301 and the joint of the second silencing passage 301 and the third silencing passage 401. Because the cross-sectional area of the second silencing passage 301 is larger than that of the first silencing passage 201, a step surface is formed at the joint of the two, so that the cross section between the two is not continuously or gradually changed, but is discontinuous, and a structural form with a suddenly changed cross section is formed. That is to say, when the airflow enters the second muffling channel 301 from the first muffling channel 201, the cross-sectional area along the air intake direction x will be suddenly enlarged, and the sound wave is reflected at the sudden change of the cross-sectional area to attenuate the noise, so as to form an expanding muffling structure, which has a better effect of attenuating the middle and low frequency range noise. Because the cross-sectional area of the second silencing passage 301 is larger than that of the third silencing passage 401, a step surface is formed at the joint of the two, so that the cross section between the two is not continuously or gradually changed, but is discontinuous, and a structural form with a suddenly changed cross section is formed. That is, when the airflow enters the third muffling channel 401 from the second muffling channel 301, the cross-sectional area along the air intake direction x is suddenly reduced, and the sound waves are reflected at the sudden change of the cross-sectional area to attenuate the noise, thereby further enhancing the attenuation effect of the second muffling channel 301 on the low-frequency noise.

The inventor has found that the air layer may affect the resonance frequency of the noise reduction structure, and the resonance frequency of the first sound deadening channel 201 can be lowered to some extent. The first silencing member 200 and the housing 100 define therebetween a first gap passage 202, and an air layer is formed by the first gap passage 202. To further achieve the air layer adjusting function, the first silencing part 200 is provided with a plurality of first through holes 210 communicating the first silencing passage 201 and the first clearance passage 202. When the air flow passes through the first silencing passage 201, the air in the first through hole 210 resonates due to the frequency of the external noise and the natural frequency of the first silencing part 200 being the same, the air at the hole neck of the first through hole 210 generates violent vibration friction, the absorption effect of the first silencing passage 201 is enhanced to form an absorption peak, so that the sound energy is greatly attenuated, and the sound energy is converted into heat energy to be dissipated after the vibration friction. And the portion of the external noise having a frequency different from the natural frequency of the first silencing element 200 can continue to be silenced through the first clearance passage 202. So, through setting up first clearance passageway 202, enlarged the sound absorption frequency band of the noise of first amortization passageway 201 to can realize the process of making an uproar of falling to the high-band noise through first amortization passageway 201.

Correspondingly, the second silencing member 300 and the casing 100 define a second clearance channel 302 therebetween, and an air layer is formed through the second clearance channel 302. To further achieve the air layer conditioning effect, the second silencing element 300 is provided with a plurality of second through holes 310 communicating the second silencing passage 301 with the second clearance passage 302. When the air flow passes through the second muffling channel 301, because most of the high-frequency noise is reduced in the first muffling channel 201, and the step formed at the joint of the first muffling channel 201 and the second muffling channel 301 is reduced to a certain extent, at this time, the second muffling channel 301 and the second gap channel 302 can further reduce the low-frequency noise. When the airflow passes through the third silencing passage 401, the step surface formed at the joint of the first silencing passage 201 and the second silencing passage 301 further reduces the noise, and the third silencing passage 401 can reduce the low-frequency noise.

From this, combine the structure of each amortization passageway, first clearance passageway 202 and second clearance passageway 302, the noise of high frequency channel can be subdued to first amortization passageway 201, the noise of middle-low frequency channel can be subdued to second amortization passageway 301, the noise of subduing the frequency channel can further be subdued to third amortization passageway 401, carried out amortization layer by layer, attenuate gradually to the produced air current noise when the air inlet of gas heater to reduce the noise, promoted the comfort level that the user used.

In order to further enhance the attenuation of sound waves away from the resonant frequency in the first sound-deadening passageway 201, in some embodiments, with continued reference to fig. 2, the noise reducer further includes a porous sound-absorbing layer 500 disposed between the first sound-deadening member 200 and the casing 100. At this time, the first gap passage 202 is defined between the porous sound absorbing layer 500 and the first silencer 200. That is, the porous sound absorption layer 500 may be disposed adjacent to the inner wall of the casing 100 as illustrated in fig. 2, and forms the first gap channel 202 with the outer wall of the first silencer 200. So, owing to be provided with porous sound absorbing layer 500, it has constituteed resonance sound absorbing structure jointly with first amortization passageway 201, first through-hole 210 and first clearance passageway 202, has increased the acoustic resistance, makes the noise frequency band that first amortization passageway 201 can structurally absorb wider, has strengthened the subduction to the noise.

The porous sound absorption layer 500 may be made of a porous sound absorption material such as an organic fiber material, a hemp felt, an inorganic fiber material, a glass wool, a rock wool, a mineral wool, a urea formaldehyde foam, a urethane foam, or the like, which can be selected according to actual conditions, and this is not particularly limited in this embodiment.

FIG. 3 illustrates a schematic structural view of an acoustic wedge 410 in one implementation of an embodiment of the present application; for convenience of explanation, only portions related to the embodiments of the present application are shown.

To further enhance the sound attenuation of the third sound attenuating channel 401, in some embodiments, referring to fig. 3 in combination with fig. 1 and 2, the noise reducing device further includes a plurality of sound absorbing wedges 410 disposed within the third sound attenuating channel 401. The sound-absorbing wedge 410 has a base 411 and a wedge portion 412 opposite to the base 411, the base 411 being provided on a side wall of the third muffling channel 401, the wedge portion 412 extending away from the side wall. Therefore, by arranging the sound absorption wedges 410, the acoustic impedance between the air and the sound absorption material is gradually transited, and good impedance matching and sound absorption effects are obtained. Specifically, in some embodiments, along the extending direction of the split part 412, the length of the split part 412 is L1, and the length of the base part 411 is L2. The ratio of L1 to L2 was 4. In this way, the rigidity of the skeleton of the wedge 410 can be ensured, and the sound absorption performance can be improved. In yet other embodiments, referring to fig. 1, a plurality of sound absorbing wedges 410 are disposed around the sidewalls of the third sound attenuating channel 401. In this way, the effect of absorbing low-frequency noise in the third muffling channel 401 is further improved. In yet other embodiments, the third sound attenuating element 400 is constructed of a porous sound absorbing material. In this process, because the third sound absorbing member 400 is wholly composed of the porous sound absorbing material, the thickness of the porous sound absorbing material is thicker than that of the porous sound absorbing layer 500, the flow resistance is larger, that is, the resistance of passing through the air particles is larger, so that the sound absorption coefficient of the low-frequency noise can be improved, and the noise absorption effect is further improved.

In some embodiments, continuing to refer to fig. 3, acoustical wedge 410 comprises a flat-headed wedge. That is, a cut surface is provided on a side of the split portion 412 away from the base portion 411, forming the split portion 412 with a flat head. In this way, space within the third muffling channel 401 can be saved while achieving a better absorption effect.

In order to better combine the characteristics of the whole gas water heater, the inventor finds that if the resonant frequency of the first silencing passage 201 is maintained within the range of 1800Hz to 2200Hz and the resonant frequency of the second silencing passage 301 is maintained within the range of 500Hz to 700Hz, the silencing process can be better carried out to reduce most of the noise. Thus, in some embodiments, the aperture of the first through hole 210 is d1, the thickness of the first sound-deadening member 200 is t1, the thickness of the first gap passage 202 is h1, and the ratio of the sum of the areas of the plurality of first through holes 210 to the area of the first sound-deadening member 200 is P1, which satisfies the following conditions: d1 is more than or equal to 3mm and less than or equal to 3.5 mm; t1 is more than or equal to 1mm and less than or equal to 1.5 mm; h1 is more than or equal to 5mm and less than or equal to 10 mm; p1 is more than or equal to 0.04 and less than or equal to 0.05. In this way, the frequency band of noise that can be absorbed by the structure of the first silencing passage 201 can be made wider. In other embodiments, the diameter of the second through hole 310 is d2, the thickness of the second sound attenuating element 300 is t2, the thickness of the second gap channel 302 is h2, and the ratio of the sum of the areas of the plurality of second through holes 310 to the area of the second sound attenuating element 300 is P2, which satisfies the following conditions: d2 is more than or equal to 2.5mm and less than or equal to 3 mm; t2 is more than or equal to 2mm and less than or equal to 3 mm; h2 is more than or equal to 30mm and less than or equal to 35 mm; p2 is more than or equal to 0.025 and less than or equal to 0.03. In this way, second muffling channel 301 can be made to better absorb mid-frequency noise structurally. For example, the aperture d1 of the first through holes 210 may be made 3mm, the thickness t1 of the first silencing piece 200 may be made 0.6mm, the interval between the first through holes 210 may be made 6mm, and the ratio P1 of the sum of the areas of the plurality of first through holes 210 to the area of the first silencing piece 200 may be made 0.042, so that the resonance frequency of the first silencing passage 201 approaches 2000 Hz.

FIG. 4 is a schematic diagram illustrating an arrangement of first vias 210 in one implementation of an embodiment of the present application; FIG. 5 is a schematic diagram illustrating an arrangement of first through holes 210 in another implementation of an embodiment of the present application; FIG. 6 is a schematic diagram illustrating an arrangement of first through holes 210 in yet another embodiment of an embodiment of the present application; for convenience of explanation, only portions related to the embodiments of the present application are shown.

Since the noises with different frequencies have different resonant frequencies, the arrangement of the first through holes 210 and the second through holes 310 may be different, and the arrangement may be selected according to the resonant frequencies in actual use. In some embodiments, the plurality of first through holes 210 are arranged such that a first unit pattern including one of a triangle and a rectangle is repeatedly formed. In other embodiments, the extending directions of the plurality of first through holes 210 are parallel to each other. In some embodiments, the plurality of second through holes 310 are arranged such that a second unit pattern including one of a triangle and a rectangle is repeatedly formed. In other embodiments, the extending directions of the plurality of second through holes 310 are parallel to each other. In this way, the required resonance frequency can be achieved for better noise absorption. For example, fig. 4 illustrates a case where the first unit pattern is triangular, fig. 5 illustrates a case where the first unit pattern is square, and fig. 6 illustrates a case where the first through holes 210 are bar-shaped holes and the plurality of first through holes 210 are parallel to each other. The arrangement and formation of the second through holes 310 can refer to the arrangement diagram of the first through holes 210, and are not described herein again.

The first unit pattern refers to a pattern formed by connecting centers of the adjacent first through holes 210. For example, when the first unit pattern is a triangle, the first unit pattern refers to a triangle formed by connecting the centers of adjacent three first through holes 210. For another example, when the first unit pattern is a square, the first unit pattern refers to a square formed by connecting the centers of the adjacent four first through holes 210. The description of the second unit pattern can refer to the description of the first unit pattern, and is not repeated herein.

In some embodiments, with continued reference to fig. 1 and 2, the noise reduction device further includes a flow guide channel 203 connected between the air inlet 110 and the first muffling channel 201. The cross-sectional area of the guide channel 203 decreases in the air intake direction x. Thus, the air is guided into the first silencing passage 201. It should be noted that the cross-sectional area of the flow guide channel 203 may be continuously reduced or may be discontinuously reduced. For example, fig. 1 and 2 illustrate a case where the cross-sectional area of the flow guide passage 203 is gradually reduced.

In some embodiments, with continued reference to fig. 1 and 2, the first sound attenuating element 200 is a one-piece structure or a split structure with the housing 100. Thus, the manufacturing or installation is convenient according to the requirement. For example, fig. 1 and 2 illustrate a case where the first silencer 200 is of an integral structure with the casing 100.

In some embodiments, continuing to refer to fig. 1 and 2, the noise reducer further comprises a bellows 600. The air outlet 120 is in communication with the inlet air of the gas water heater by means of a bellows 600. Therefore, the generation of a fluid boundary layer can be destroyed, and the air inlet resistance is reduced. Optionally, a pressure measuring nozzle (not shown) may be further disposed on the bellows 600, and a venturi flow meter (not shown) may be further installed as required, so as to measure the intake air flow accurately.

Based on the same inventive concept, the application provides a gas water heater, which comprises the noise reduction device in the embodiment, wherein the noise reduction device is arranged at an air inlet of the gas water heater. So, can reduce the produced noise of gas heater when the air inlet, improve user's use and experienced.

To sum up, the noise reduction device in this application embodiment sets up the amortization passageway through the segmentation to combine the first clearance passageway 202, second clearance passageway 302, porous sound-absorbing layer 500 and the wedge 410 that absorbs sound that sets up, from improving resonance frequency and the successive layer absorb the angle of the noise of different frequencies, make the air current noise loop through first amortization passageway 201, second amortization passageway 301 and third amortization passageway 401 after, amortization gradually attenuates layer by layer, thereby reduced the air current noise, promote the comfort level that the user used.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.

Claims (10)

1. The utility model provides a device of making an uproar falls for gas heater's air inlet entrance, its characterized in that includes:

the air conditioner comprises a shell (100) and a fan, wherein the shell (100) is provided with an accommodating chamber, one end of the shell (100) is provided with an air inlet (110), the other end of the shell (100) is provided with an air outlet (120), and the air inlet (110) and the air outlet (120) are respectively communicated with the accommodating chamber; and

the air inlet structure comprises a first silencing piece (200), a second silencing piece (300) and a third silencing piece (400) which are sequentially arranged in an accommodating chamber along an air inlet direction (x), wherein a first silencing channel (201) communicated with an air inlet (110) is formed in the first silencing piece (200), a second silencing channel (301) is formed in the second silencing piece (300), a third silencing channel (401) communicated with an air outlet (120) is formed in the third silencing piece (400), and the first silencing channel (201), the second silencing channel (301) and the third silencing channel (401) are sequentially communicated to form an air inlet channel;

along the air inlet direction (x), the cross-sectional area of the second silencing channel (301) is larger than that of the first silencing channel (201) and that of the third silencing channel (401), and step surfaces are respectively formed at the joint of the first silencing channel (201) and the second silencing channel (301) and the joint of the second silencing channel (301) and the third silencing channel (401);

a first clearance channel (202) is defined between the first silencing piece (200) and the shell (100), and a second clearance channel (302) is defined between the second silencing piece (300) and the shell (100);

the first silencing piece (200) is provided with a plurality of first through holes (210) for communicating the first silencing passage (201) with the first gap passage (202), and the second silencing piece (300) is provided with a plurality of second through holes (310) for communicating the second silencing passage (301) with the second gap passage (302).

2. The noise reducer according to claim 1, further comprising a porous sound absorbing layer (500) disposed between the first sound attenuating element (200) and the housing (100);

the porous sound absorbing layer (500) and the first sound attenuating element (200) define the first interstitial channel (202) therebetween.

3. The noise reducer according to claim 1, further comprising a plurality of sound absorbing wedges (410) disposed within the third muffling channel (401);

the sound wedge (410) is provided with a base part (411) and a tip part (412) opposite to the base part (411), the base part (411) is arranged on the side wall of the third sound attenuation channel (401), and the tip part (412) extends away from the side wall.

4. The noise reducer according to claim 3, characterized in that, in the direction of extension of the tip portion (412), the tip portion (412) has a length L1, the base portion (411) has a length L2;

wherein the ratio of L1 to L2 is 4.

5. The noise reduction device according to claim 3, characterized in that a plurality of said sound-absorbing wedges (410) are arranged around a side wall of said third muffling channel (401); and/or

The sound absorbing wedge (410) comprises a flat-head wedge.

6. The noise reduction device according to any of claims 1-5, characterized in that the third sound-attenuating element (400) consists of a porous sound-absorbing material; and/or

The extending directions of the first through holes (210) are parallel to each other; and/or

The extending directions of the second through holes (310) are parallel to each other.

7. The noise reducer according to any of claims 1-5, wherein the aperture of the first through hole (210) is d1, the thickness of the first silencer element (200) is t1, the thickness of the first gap channel (202) is h1, and the ratio of the sum of the areas of the plurality of first through holes (210) to the area of the first silencer element (200) is P1, wherein the following conditions are satisfied:

3mm≤d1≤3.5mm；

1mm≤t1≤1.5mm；

5mm≤h1≤10mm；

0.04≤P1≤0.05；

and/or the aperture of the second through hole (310) is d2, the thickness of the second silencing piece (300) is t2, the thickness of the second gap channel (302) is h2, and the ratio of the sum of the areas of the second through holes (310) to the area of the second silencing piece (300) is P2, which satisfies the following conditions:

2.5mm≤d2≤3mm；

2mm≤t2≤3mm；

30mm≤h2≤35mm；

0.025≤P2≤0.03。

8. the noise reduction device according to any one of claims 1 to 5, wherein a plurality of the first through holes (210) are arranged such that a first unit pattern is repeatedly formed, the first unit pattern including one of a triangle and a rectangle; and/or

A plurality of the second via holes (310) are arranged such that a second unit pattern including one of a triangle and a rectangle is repeatedly formed.

9. The noise reducer according to any of claims 1-5, further comprising a bellows (600), wherein the air outlet (120) communicates with an air inlet of the gas water heater by means of the bellows (600); and/or

The noise reduction device also comprises a flow guide channel (203) connected between the air inlet (110) and the first silencing channel (201); along the air inlet direction (x), the cross-sectional area of the flow guide channel (203) decreases.

10. A gas water heater comprising a noise reducer as claimed in any one of claims 1 to 9, said noise reducer being provided at an inlet of said gas water heater.

Images