CN115875854A

CN115875854A - Gas water heater

Info

Publication number: CN115875854A
Application number: CN202111122605.4A
Authority: CN
Inventors: 毕三宝; 刘云; 秦康; 韩啸; 严熙成; 宋恒; 林宇震
Original assignee: Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2023-03-31

Abstract

The application relates to the technical field of water heaters and discloses a gas water heater, which comprises: a water heater body; the silencer is arranged on the water heater body; the adjusting part is matched with the silencer and used for changing parameters influencing the characteristic frequency of the silencer so as to change the characteristic frequency of the silencer, so that the difference value between the characteristic frequency and the frequency of the thermoacoustic oscillation can be smaller than or equal to a preset difference value, the characteristic frequency is consistent with or close to the frequency of the thermoacoustic oscillation, the sound attenuation effect of the Helmholtz resonance silencer is the best, the thermoacoustic oscillation can be inhibited, the oscillation noise is reduced, and the use experience of a user is improved.

Description

Gas water heater

Technical Field

The application relates to the technical field of water heaters, in particular to a gas water heater.

Background

At present, with the stricter and stricter emission requirements, technologies such as premixed combustion, lean combustion, rich-lean combustion and the like are increasingly applied to gas water heaters. The technologies bring a new problem while reducing pollutants such as CO generated by combustion: and (4) combustion instability. Flame can produce huge oscillating noise when unstable burning, influences user's use and experiences to probably bring the potential safety hazard.

At present, gas water heater manufacturers at home and abroad mainly reduce combustion oscillation noise by avoiding working points where combustion oscillation may occur, additionally arranging a shell silencing layer and the like.

The combustion oscillation is reduced by avoiding the working points where the combustion oscillation possibly occurs, the working points where the combustion oscillation possibly occurs when the gas water heater works are all measured through laboratory tests, then the working points are avoided in a control program through modes of improving air and the like, and part of emission performance is generally required to be sacrificed after the oil-gas ratio is changed and the combustion is more stable.

The combustion oscillation is reduced by additionally arranging the shell sound-absorbing layer, so that the method is a method for treating symptoms and root causes, the combustion oscillation is not inhibited, the noise is isolated and cannot be heard by a user, and the combustion oscillation can reduce the service life of the water heater and the negative influence of potential safety hazard caused by possible damage to a mechanical structure is not eliminated.

Moreover, the existing gas water heaters of different types and different structures are often inconsistent in thermo-acoustic oscillation frequency, and the silencer is only effective for the gas water heaters consistent with the self vibration frequency (characteristic frequency), so that the same silencer cannot simultaneously generate better silencing effect on the gas water heaters of different types and different structures.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a gas water heater, which aims to solve the problems that the combustion oscillation reduction technology by avoiding the working point where the combustion oscillation is likely to occur and additionally installing a shell noise reduction layer respectively has respective defects and the same silencer cannot simultaneously generate better noise reduction effects on gas water heaters of different types and different structures.

According to a technical scheme of the present invention, there is provided a gas water heater, comprising: a water heater body; the silencer is arranged on the water heater body; and the adjusting piece is matched with the silencer and used for changing a parameter influencing the characteristic frequency of the silencer so as to change the characteristic frequency of the silencer.

Optionally, the muffler includes a helmholtz resonance muffler, and the helmholtz resonance muffler includes an muffling chamber and a neck, and the neck is communicated between the muffling chamber and the flow passage of the water heater body.

Optionally, the adjusting piece is connected with the cavity wall of the muffling cavity and used for driving the cavity wall of the muffling cavity to move so as to change the volume of the muffling cavity; or the number of the silencing cavities is multiple, the volumes of at least two silencing cavities are different, and the adjusting piece is connected with the neck or connected with the silencing cavities and used for enabling the neck to be communicated with the silencing cavities with different volumes.

Optionally, the adjusting member is connected to the neck portion and configured to move a sidewall of the neck portion to change a cross-sectional area and/or a length of the neck portion; or the number of the necks is multiple, the cross sections of at least two necks are different, and the adjusting piece is connected with the necks or the muffling cavity and is used for driving the necks with different cross sections to be communicated with the muffling cavity; or the number of the necks is multiple, the lengths of at least two necks are different, and the adjusting piece is connected with the necks or the silencing cavities and used for driving the necks with different lengths to be communicated with the silencing cavities.

Optionally, the water heater body comprises a fume collecting hood; helmholtz resonance silencer includes the bottom plate, the bottom plate is located the collection petticoat pipe, and with the collection petticoat pipe encloses out jointly the noise elimination chamber, the runner of water heater body includes the collection petticoat pipe and/or the flue gas runner that Helmholtz resonance silencer injectd, the neck intercommunication flue gas runner with the noise elimination chamber.

Optionally, the base plate comprises: the side enclosure wall is arranged on the inner side of the smoke collecting hood and limits the smoke flow channel; a bottom wall connected between the side enclosure wall and the fume collecting hood; wherein, the side enclosure wall, the bottom wall and the smoke collecting cover enclose the silencing cavity together.

Optionally, the water heater body comprises a smoke tube; the Helmholtz resonance silencer comprises a bottom plate, wherein the bottom plate is arranged on the pipe wall of the smoke pipe and surrounds the silencing cavity together with the pipe wall of the smoke pipe, a flow passage of the water heater body comprises a smoke exhaust flow passage limited by the smoke pipe and/or the Helmholtz resonance silencer, and the neck is communicated with the smoke exhaust flow passage and the silencing cavity.

Optionally, the floor is located inside the smoke tube and defines the smoke evacuation flow path.

Optionally, the adjusting member is connected to the bottom plate, and is configured to drive the bottom plate to move relative to a cavity wall of the muffling cavity except the bottom plate, so as to change a volume of the muffling cavity.

Optionally, the water heater body further includes a partition plate, the partition plate is located in the silencing cavity and divides the silencing cavity into a plurality of sub-silencing cavities distributed along the circumferential direction and/or the axial direction of the flow channel of the water heater body, at least two of the sub-silencing cavities have different volumes, and the adjusting member is connected with the neck portion or connected with the sub-silencing cavities and used for communicating the neck portion with the sub-silencing cavities having different volumes.

The gas water heater provided by the embodiment of the disclosure can realize the following technical effects:

thermoacoustic oscillation appears in gas heater, when producing huge oscillation noise, the adjusting part changes the parameter that influences the characteristic frequency of helmholtz resonance silencer, thereby can change the characteristic frequency of helmholtz resonance silencer, make the difference of characteristic frequency and the frequency of thermoacoustic oscillation be less than or equal to and predetermine the difference, make characteristic frequency unanimous or more near with the frequency of thermoacoustic oscillation, the noise cancelling effect of helmholtz resonance silencer is the best this moment, thermoacoustic oscillation can be suppressed, weaken the oscillation noise, improve user's use and experience, and need not sacrifice gas heater's emission performance and avoid the potential safety hazard that thermoacoustic oscillation brought. And through the work of regulating part, can make same silencer can have multiple different eigen frequency to can all have better noise cancelling effect to the gas heater of different types, isostructure.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated in the accompanying drawings, which correspond to the accompanying drawings and not in a limiting sense, in which elements having the same reference numeral designations represent like elements, and in which:

FIG. 1 is a schematic structural diagram of a gas water heater provided by an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of another gas water heater provided by the embodiment of the present disclosure;

FIG. 3 is a schematic structural view of a smoke collection hood provided by the disclosed embodiment;

FIG. 4 is a schematic view of a smoke tube according to an embodiment of the present disclosure;

FIG. 5 is a cross-sectional schematic view of a smoke tube provided by an embodiment of the present disclosure;

FIG. 6 is a schematic cross-sectional view of another smoke tube provided by an embodiment of the present disclosure;

FIG. 7 is a schematic cross-sectional view of yet another smoke tube provided in accordance with an embodiment of the present disclosure;

FIG. 8 is a schematic cross-sectional view of yet another smoke tube provided in accordance with an embodiment of the present disclosure;

FIG. 9 is a schematic view of a Helmholtz resonance muffler and a flow passage of a water heater in a state that the first neck is communicated with the muffling cavity according to an embodiment of the present disclosure;

fig. 10 is a schematic view of a structure of the helmholtz resonance silencer in cooperation with the flow passage of the water heater under the condition that the second neck is communicated with the silencing cavity according to the embodiment of the disclosure.

Reference numerals are as follows:

10. a smoke collecting hood; 20. a base plate; 201. a side surrounding wall; 202. a bottom wall; 30. a flue gas channel; 40. a Helmholtz resonance muffler; 401. an anechoic chamber; 402. a neck portion; 403. a sub-anechoic chamber; 404. a first neck portion; 405. a second neck portion; 406. a switch; 407. a partition plate; 50. a gas water heater; 501. a smoke pipe; 502. a combustion chamber; 503. a flow passage of the water heater body; 504. a water heater body; 505. a water inlet pipe; 506. a water outlet pipe; 507. a heat exchanger; 70. an adjustment member; 701. a motor; 702. a threaded connecting rod; 703. a nut; 80. a smoke exhaust channel; 901. a controller; 902. an acoustic sensor.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art according to specific situations.

The term "plurality" means two or more unless otherwise specified.

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

Referring to fig. 1 and 2, an embodiment of the present disclosure provides a gas water heater 50, including: a water heater body 504, a muffler and a regulator 70.

The water heater body 504 includes the shell, and the appearance chamber is injectd to the shell, and water heater body 504 still includes the combustor, combustion chamber 502, heat exchanger 507 and collection petticoat pipe 10, and the combustor, combustion chamber 502, heat exchanger 507 and collection petticoat pipe 10 are located the appearance intracavity, and the combustor top is combustion chamber 502, and combustion chamber 502 top is heat exchanger 507, heat exchanger 507 top fixedly connected with collection petticoat pipe 10, and collection petticoat pipe 10 top is equipped with the exhaust port, and tobacco pipe 501 is connected at the exhaust port department to at least part is located outside the appearance chamber, and tobacco pipe 501 is used for discharging the flue gas.

The outer surface of the heat exchanger 507 is wound with a water inlet pipe 505 and a water outlet pipe 506 which are connected, water enters from the water inlet pipe 505, absorbs heat from the heat exchanger 507, and then flows out from the water outlet pipe 506.

As shown in fig. 3, the muffler is provided to the water heater body 504; the tuning element 70 cooperates with the muffler for changing a parameter that affects the characteristic frequency of the muffler to change the characteristic frequency of the muffler.

The adjustment element 70 can change a parameter that affects a characteristic frequency of the muffler (which can also be referred to as a natural frequency, a resonant frequency, an eigen frequency, or a design frequency) so that the characteristic frequency of the muffler can be changed to approximate the frequency of combustion oscillations (thermoacoustic oscillations) of the gas water heater 50. The characteristic frequency of the muffler should be close to the frequency of combustion oscillation (thermoacoustic oscillation) of the gas water heater 50, and a better sound absorption effect can be achieved when the frequency difference is less than 20Hz in general.

Therefore, by designing the adjusting part 70, the parameters of the silencer can be changed, so that the characteristic frequency of the silencer can be changed, on one hand, for different thermoacoustic oscillation frequencies, the silencer can adjust the characteristic frequency of the silencer to be close to the thermoacoustic oscillation frequency, and a better silencing effect is achieved; on the other hand, the same silencer can be suitable for gas water heaters 50 with different structures, different types and different thermoacoustic oscillation frequencies by adjusting the characteristic frequency of the silencer, and the application range of the silencer in the application is enlarged.

Optionally, the muffler includes a helmholtz resonance muffler 40, and the helmholtz resonance muffler 40 includes an muffling chamber 401 and a neck 402, and the neck 402 communicates between the muffling chamber 401 and a flow passage 503 of the water heater body.

The flow passage 503 of the water heater body is a passage for gas or smoke to flow through, and includes an internal space of the combustion chamber 502, an internal space of the smoke collecting hood 10 and an internal space of the smoke pipe 501 which are sequentially communicated, and after the gas or smoke is combusted in the combustion chamber 502, the gas or smoke sequentially flows through the smoke collecting hood 10 and the smoke pipe 501 and is discharged to the outside.

The neck 402 is of a hollow structure, one end of the hollow structure is communicated with the silencing cavity 401, and the other end of the hollow structure is communicated with the flow passage 503 of the water heater body, so that the silencing cavity 401 is communicated with the flow passage 503 of the water heater body. The sound waves of the flow passage 503 of the water heater body enter the muffling chamber 401 through the hollow structure.

When the frequency of the incident sound wave from the flow channel of the water heater body 504 is the same as or close to the natural frequency of the helmholtz resonance silencer 40, the air in the silencing cavity 401 resonates, so that the sound wave energy can be dissipated through the friction of the air, and the silencing is realized.

The muffler may also comprise a microperforated panel muffler.

The parameter influencing the characteristic frequency of the Helmholtz resonance damper 40 is primarily the volume V of the damping chamber 401 ₀ (ii) a Neck 402 cross-sectional area A; and an effective length Leq of the neck 402. Wherein the effective length of the neck 402 is related to the total length L of the neck 402, the diameter d of the neck 402 and the correction factor λ (generally 0.3-0.5).

After the above parameters are determined, the characteristic frequency f of the Helmholtz resonance silencer 40 _H Can be calculated by the following formula, wherein c in the formula is the local sound velocity. Wherein:

Leq＝L+λd

according to the formula, the volume V of the anechoic cavity 401 can be adjusted ₀ The cross-sectional area A of the neck 402, the total length L of the neck 402, and the diameter d of the neck 402 change the characteristic frequency f of the Helmholtz resonance silencer 40 _H 。

In a first specific embodiment, as shown in fig. 3, the adjusting member 70 is connected to the wall of the muffling chamber 401 for driving the wall of the muffling chamber 401 to move so as to change the volume of the muffling chamber 401.

The adjusting member 70 changes the position of one chamber wall of the muffling chamber 401 relative to the other chamber wall by moving the chamber wall relative to the other chamber wall, so as to change the volume of the muffling chamber 401, and thus the characteristic frequency of the helmholtz resonance muffler 40.

The adjusting member 70 includes a driver, which may include a motor or a piston assembly, and a transmission member, which may be a rack and pinion mechanism or a link slider mechanism.

The adjusting part 70 drives the chamber wall to do linear motion or curvilinear motion, and can rotate or slide, and for various forms of the adjusting part 70, the characteristic frequency of the helmholtz resonance muffler 40 can be changed under the driving of the adjusting part 70 as long as the chamber wall meeting the requirement of the muffling chamber 401 is within the protection range of the application.

In a second specific embodiment, the number of the muffling cavities 401 is multiple, and at least two muffling cavities 401 have different volumes, and the adjusting member 70 is connected with the neck 402 or connected with the muffling cavities 401, so that the neck 402 is communicated with the muffling cavities 401 having different volumes.

The adjustment member 70 communicates the neck 402 with the muffling chamber 401 of different volumes, so that by selecting the muffling chamber 401, the volume of the muffling chamber 401 in communication with the neck 402 can be changed, thereby changing the characteristic frequency of the active (neck 402 in communication with the muffling chamber 401) helmholtz resonant muffler 40.

Illustratively, the plurality of muffling cavities 401 include a first muffling cavity and a second muffling cavity having different volumes, one end of the neck 402 is communicated with the flow channel 503 of the water heater body, and the adjusting member 70 drives the neck 402 to slide or rotate, so that the other end of the neck 402 can be communicated with the first muffling cavity or the second muffling cavity, and correspondingly, the first muffling cavity is communicated with the flow channel 503 of the water heater body, or the second muffling cavity is communicated with the flow channel 503 of the water heater body. When the first muffling cavity is communicated with the flow channel 503 of the water heater body, the helmholtz resonance muffler 40 which is composed of the first muffling cavity and the neck 402 plays a role in muffling the gas water heater 50; when the second muffling chamber is communicated with the flow passage 503 of the water heater body, the second muffling chamber which is effective for muffling the gas water heater 50 and the neck 402 form the helmholtz resonance muffler 40.

The number of the necks 402 may be one or more, and when the number of the necks 402 is one, the adjusting member 70 changes the muffling chamber 401 communicated with the necks 402, thereby changing the volume of the muffling chamber 401 communicated with the necks 402; when the number of the necks 402 is multiple, the adjusting member 70 may be connected to the muffling chambers 401 to connect one of the muffling chambers 401 to one of the necks 402, or the adjusting member 70 may be connected to the necks 402 to connect one of the necks 402 to one of the muffling chambers 401.

Or a switch is arranged in the silencing cavity, the switch is positioned at the joint of the first silencing cavity and the second silencing cavity, the adjusting piece is connected with the switch, and the first silencing cavity is communicated with the neck or the second silencing cavity is communicated with the neck by controlling the movement of the switch.

In a third specific embodiment, an adjustment member 70 is coupled to the neck 402 for moving the sidewall of the neck 402 to change the cross-sectional area and/or length of the neck 402, thereby changing the characteristic frequency of the Helmholtz resonance muffler 40.

Illustratively, the adjusting member 70 may change the cross-sectional area of the neck 402 by moving a partial sidewall of the circumference of the neck 402 in a radial direction of the neck 402; the length of the neck 402 can be changed by the adjustment member 70 moving the side of the neck 402 along the axial direction of the neck 402.

In a fourth specific embodiment, the number of the necks 402 is multiple, and the cross-sectional areas of at least two necks 402 are different, and the adjusting member 70 is connected to the necks 402 or the muffling chamber 401 for bringing the necks 402 with different cross-sectional areas into communication with the muffling chamber 401.

The adjustment member 70 communicates the muffling chamber 401 with a neck 402 of different cross-sectional area, so that by selecting the neck 402, the cross-sectional area of the neck 402 communicating with the muffling chamber 401 can be changed, thereby changing the characteristic frequency of the active (the neck 402 communicating with the muffling chamber 401) helmholtz resonator muffler 40.

Illustratively, the plurality of necks 402 include a first neck 404 and a second neck 405 with different cross-sectional areas, and the adjusting member 70 drives the muffling chamber 401 to slide or rotate, such that the muffling chamber 401 is communicated with the first neck 404 or the second neck 405, and correspondingly, the muffling chamber 401 is communicated with the flow passage 503 of the water heater body through the first neck 404, or the second neck 405 is communicated with the flow passage 503 of the water heater body. When the first neck 404 is communicated with the flow passage 503 of the water heater body, the helmholtz resonance silencer 40 is composed of the first neck 404 and the silencing cavity 401, and the helmholtz resonance silencer has the function of silencing the gas water heater 50; when the second neck 405 is communicated with the flow passage 503 of the water heater body, the second neck 405 and the silencing cavity 401, which play a role in silencing the gas water heater 50, form the helmholtz resonance silencer 40.

Or a switch is arranged in the neck, the switch is positioned at the joint of the first neck and the second neck, the adjusting piece is connected with the switch, and the first neck is communicated with the silencing cavity or the second neck is communicated with the silencing cavity by controlling the movement of the switch.

In a fifth specific embodiment, the number of the necks 402 is multiple, and the lengths of at least two necks 402 are different, and the adjusting member 70 is connected to the necks 402 or the muffling chamber 401 and is used for bringing the necks 402 of different lengths into communication with the muffling chamber 401.

The adjustment member 70 communicates the muffling chamber 401 with necks 402 of different lengths, so that by selecting the neck 402, the length of the neck 402 communicating with the muffling chamber 401 can be changed, thereby changing the characteristic frequency of the active (neck 402 communicating with the muffling chamber 401) helmholtz resonator muffler 40.

Illustratively, the plurality of necks 402 include a first neck 404 and a second neck 405 with different lengths, and the adjusting member 70 drives the muffling chamber 401 to slide or rotate, so that the muffling chamber 401 is communicated with the first neck 404 or the second neck 405, and correspondingly, the muffling chamber 401 is communicated with the flow passage 503 of the water heater body through the first neck 404, or the second neck 405 is communicated with the flow passage 503 of the water heater body. When the first neck 404 is communicated with the flow passage 503 of the water heater body, the helmholtz resonance silencer 40 is composed of the first neck 404 and the silencing cavity 401, and the helmholtz resonance silencer has the function of silencing the gas water heater 50; when the second neck 405 is communicated with the flow passage 503 of the water heater body, the second neck 405 and the silencing cavity 401, which play a role in silencing the gas water heater 50, form the helmholtz resonance silencer 40.

Alternatively, a switch 406 is provided in the neck, for example, as shown in fig. 9 and 10, the switch 406 is located at the junction of the first neck and the second neck, and the adjusting member is connected to the switch, so that the first neck is communicated with the muffling chamber as shown in fig. 9 or the second neck is communicated with the muffling chamber as shown in fig. 10 by controlling the movement of the switch.

The adjusting member 70 includes a driver, which may include a motor 701 or a piston assembly, and a transmission member, which may be a rack and pinion mechanism or a link slider mechanism, etc.

Optionally, the water heater body 504 includes a fume collecting hood 10; the helmholtz resonance silencer 40 comprises a bottom plate 20, the bottom plate 20 is arranged on the smoke collecting hood 10, and the bottom plate 20 and the smoke collecting hood 10 jointly enclose a silencing cavity 401, a flow channel 503 of the water heater body comprises a smoke channel 30 limited by the smoke collecting hood 10 and/or the helmholtz resonance silencer 40, and a neck 402 is communicated with the smoke channel 30 and the silencing cavity 401.

The sound waves enter the silencing cavity 401 from the flue gas flow channel 30 through the neck 402 to realize silencing.

Compare in combustion chamber 502, collection petticoat pipe 10 department temperature is lower, consequently, locates collection petticoat pipe 10 with helmholtz resonance silencer 40, can reduce the requirement to helmholtz resonance silencer 40 material and can improve the life-span of helmholtz resonance silencer 40.

The bottom plate 20 can be arranged on the inner side or the outer side of the smoke collecting cover 10, and when arranged on the outer side of the smoke collecting cover 10, the smoke collecting cover 10 limits a smoke flow passage 30; when disposed inside the fume collecting hood 10, the floor 20 and/or the fume collecting hood 10 define a fume flow path 30.

Optionally, as shown in fig. 3, the base panel 20 includes side enclosure walls 201 and a bottom wall 202.

The side surrounding wall 201 is arranged at the inner side of the smoke collecting cover 10 and defines the smoke flow channel 30, and the side surrounding wall 201 is annular and extends along the circumferential direction of the smoke collecting cover 10 and extends along the direction of the smoke flow channel 30; the bottom wall 202 is connected between the outer wall surface of the side enclosing wall 201 and the inner wall surface of the smoke collecting cover 10, and is in a ring shape extending along the circumferential direction of the smoke collecting cover 10; wherein, the side wall 201, the bottom wall 202 and the exhaust fume collecting hood 10 enclose a silencing cavity 401 together, and the silencing cavity 401 is in an annular shape extending along the circumferential direction of the exhaust fume collecting hood 10.

Locate side enclosure 201 and bottom plate 20 inside collection petticoat pipe 10, realize with the coupling of helmholtz resonance silencer 40 on collection petticoat pipe 10, can save a large amount of spaces, neither can increase collection petticoat pipe 10's volume nor change collection petticoat pipe 10's outward appearance.

Optionally, the neck 402 is disposed on the side wall 201 or the bottom plate 20, so that the neck 402 can easily communicate with the muffling chamber 401 and the flue gas channel 30, and thus the neck 402 can be designed to have a regular shape, such as a cylinder, without the need for the neck 402 to be designed to have a special shape (irregular shape) because the neck 402 is not located for facilitating the communication between the muffling chamber 401 and the flue gas channel 30.

Optionally, the water heater body 504 further includes a partition 407, the partition 407 is located in the muffling chamber 401 and divides the muffling chamber 401 into a plurality of sub-muffling chambers 403 distributed along the circumferential direction and/or the axial direction of the flue gas flow channel 30, at least two sub-muffling chambers 403 have different volumes, and the adjusting member 70 is connected to the neck 402 or connected to the sub-muffling chambers 403, so that the neck 402 is communicated with the sub-muffling chambers 403 having different volumes.

When the neck 402 is communicated with the sub-muffling cavity 403, the sub-muffling cavity 403 is communicated with the flue gas channel 30, so that the neck 402 and the sub-muffling cavity 403 form the helmholtz resonance muffler 40.

The adjusting member 70 adjusts the neck 402 to communicate with a sub-muffling chamber 403 according to the frequency of the thermo-acoustic oscillation, so that the characteristic frequency of the helmholtz resonance muffler 40 including the sub-muffling chamber 403 is the same as or close to the frequency of the thermo-acoustic oscillation, thereby enhancing the muffling effect.

The plurality of sub-muffling cavities 403 are distributed along the circumferential direction and/or the axial direction of the flue gas flow channel 30, so that the utilization rate of the mouth space of the smoke collecting hood 10 can be improved.

Optionally, as shown in fig. 4-8, the water heater body 504 includes a smoke tube 501; the helmholtz resonance silencer 40 comprises a bottom plate 20, the bottom plate 20 is arranged on the pipe wall of the smoke pipe 501, and the bottom plate 20 and the pipe wall of the smoke pipe 501 jointly enclose a silencing cavity 401, a flow channel 503 of the water heater body comprises a smoke exhaust flow channel 80 defined by the smoke pipe 501 and/or the helmholtz resonance silencer 40, and a neck 402 is communicated with the smoke exhaust flow channel 80 and the silencing cavity 401.

The sound waves enter the silencing cavity 401 from the smoke evacuation flow channel 80 through the neck 402, so that silencing is realized.

Compare in collection petticoat pipe 10, tobacco pipe 501 department temperature further reduces, consequently, locates tobacco pipe 501 with helmholtz resonance silencer 40, on the one hand, can reduce the requirement to helmholtz resonance silencer 40 material and can improve the life-span of helmholtz resonance silencer 40, and on the other hand, tobacco pipe 501 is located the outside of shell to conveniently maintain or change helmholtz resonance silencer 40.

The bottom plate 20 can be disposed on the inner side or the outer side of the smoke tube 501, and when disposed on the outer side of the smoke tube 501, the smoke tube 501 defines a smoke flow passage 30; when disposed inside the smoke tube 501, the floor 20 and/or the smoke tube 501 define a smoke flow path 30.

Optionally, the bottom plate 20 is located inside the smoke tube 501 and defines a smoke evacuation flow passage, and the bottom plate 20 is in a ring shape extending along the circumference of the smoke tube 501.

Bottom plate 20 is located inside of smoke tube 501 so as not to increase the volume of smoke tube 501 and not to affect the appearance of smoke tube 501.

Optionally, as shown in fig. 7, the water heater body 504 further includes a partition 407, the partition 407 is located in the muffling chamber 401 and divides the muffling chamber 401 into a plurality of sub-muffling chambers 403 distributed along the circumferential direction and/or the axial direction of the smoke evacuation flow channel 80, at least two sub-muffling chambers 403 have different volumes, and the adjusting element 70 is connected to the neck 402 and is configured to drive the neck 402 to communicate with the sub-muffling chambers 403 having different volumes.

When the neck 402 is communicated with the sub muffling chamber 403, the sub muffling chamber 403 is communicated with the smoke evacuation flow channel 80, so that the neck 402 and the sub muffling chamber 403 form the helmholtz resonance muffler 40.

The plurality of sub-muffling cavities 403 are distributed along the circumferential direction and/or the axial direction of the smoke evacuation flow channel 80, so that the utilization rate of the space of the smoke pipe 501 can be improved.

Optionally, an adjusting member 70 is connected to the bottom plate 20 for moving the bottom plate 20 relative to the other chamber walls of the muffling chamber except the bottom plate to change the volume of the muffling chamber 401. Other chamber walls include the smoke collection cage 10 when the base is applied to the smoke collection cage and the smoke tube 501 when the base is applied to the smoke tube.

The adjusting member 70 moves the bottom plate 20 instead of moving the smoke collecting hood 10 or the smoke pipe 501, so that the position of the smoke collecting hood 10 or the smoke pipe 501 is not changed, and the characteristic frequency of the active Helmholtz resonance silencer 40 is changed without affecting the structure of the water heater body 504.

In a specific embodiment, as shown in fig. 3, the base plate 20 is provided to the smoke collecting hood 10, and the adjusting member 70 includes a stepping motor 701, a screw link 702, and a nut 703. The motor 701 is drivingly connected to one end of the screw, and the other end of the screw is screwed into the nut 703. The nut 703 is fixedly provided on the base plate 20, and the screw is threadedly coupled to the nut 703 so that the screw can move relative to the nut 703 in the axial direction of the screw. When the characteristic frequency of the helmholtz resonance silencer 40 needs to be adjusted, the motor 701 drives the screw to rotate, and the screw corresponds to the characteristic frequencyThe nut 703 moves along the axial direction of the screw rod, thereby driving the bottom plate 20 to move relative to the smoke collecting cover 10, and realizing the volume V of the sound attenuation chamber 401 ₀ And thereby the characteristic frequency of the helmholtz resonance muffler 40.

The motor 701 is provided outside the fume collecting cover 10 so that the motor 701 does not affect the internal structure of the fume collecting cover 10. For example, as shown in fig. 3, the motor 701 is provided outside the top wall of the smoke collecting cover 10 to move the bottom plate 20 in the up-and-down direction.

Optionally, the adjusting member 70 drives the bottom plate 20 to reciprocate along the length direction of the flow passage 503 of the water heater body where the bottom plate 20 is located. For example, as shown in fig. 3, the length direction of the flow passage 503 of the water heater body is the up-down direction, and the adjusting member 70 drives the bottom plate 20 to reciprocate in the up-down direction.

As shown in fig. 2, the gas water heater further includes a controller 901 connected to the adjusting member and an acoustic sensor 902 disposed in the combustion chamber, so that when the gas water heater is in a normal combustion state, the noise is not very loud, but when the gas water heater is abnormally combusted and combustion oscillation (thermoacoustic oscillation) occurs, strong noise different from normal noise is generated. At the moment, the sound sensor can detect that the sound intensity of the gas water heater is higher than that during normal working, the controller judges that the gas water heater is in an abnormal combustion state, the characteristic frequency (vibration frequency) of the silencer is required to be changed to approach the frequency of the thermoacoustic oscillation of the gas water heater, the controller can send a signal to control the motor to start, and the motor drives the threaded connecting rod to rotate, so that the nut on the bottom plate is driven to move up and down, the volume of the silencing cavity is reduced or increased, and the purpose of changing the characteristic frequency of the silencer is finally achieved. When the characteristic frequency of the silencer is close to the frequency of the thermoacoustic oscillation of the gas water heater, the thermoacoustic oscillation can be inhibited, the sound is restored to normal combustion sound intensity, and at the moment, the sound sensor enables the controller to control the motor to stop working through signals, so that the silencer can be kept working under the volume of the silencing cavity.

Optionally, the neck 402 is at least partially located within the muffling chamber 401, which can reduce the length of the neck 402 extending out of the muffling chamber 401, thereby further reducing the volume occupied by the helmholtz resonance muffler 40. It is understood that the neck 402 may also be located entirely outside the anechoic chamber 401. The neck is located entirely within the sound-attenuating chamber, as in fig. 5, and partially within the sound-attenuating chamber, as in fig. 8.

The above description and the drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A gas water heater, comprising:

a water heater body;

the silencer is arranged on the water heater body;

and the adjusting piece is matched with the silencer and used for changing parameters influencing the characteristic frequency of the silencer so as to change the characteristic frequency of the silencer.

2. The gas water heater of claim 1,

the silencer includes helmholtz resonance silencer, helmholtz resonance silencer includes noise elimination chamber and neck, the neck intercommunication is in between the noise elimination chamber and the runner of water heater body.

3. The gas water heater of claim 2,

the adjusting piece is connected with the cavity wall of the muffling cavity and used for driving the cavity wall of the muffling cavity to move so as to change the volume of the muffling cavity; or

The number of the silencing cavities is multiple, the volumes of at least two silencing cavities are different, and the adjusting piece is connected with the neck or connected with the silencing cavities and used for enabling the neck to be communicated with the silencing cavities with different volumes.

4. The gas water heater of claim 2,

the adjusting piece is connected with the neck and used for driving the side wall of the neck to move so as to change the cross-sectional area and/or the length of the neck; or

The number of the neck parts is multiple, the cross sectional areas of at least two neck parts are different, and the adjusting piece is connected with the neck parts or the muffling cavity and used for driving the neck parts with different cross sectional areas to be communicated with the muffling cavity; or

The number of the necks is multiple, the lengths of at least two necks are different, and the adjusting piece is connected with the necks or the silencing cavities and used for driving the necks with different lengths to be communicated with the silencing cavities.

5. The gas water heater of claim 2, wherein the water heater body includes a smoke collection hood;

helmholtz resonance silencer includes the bottom plate, the bottom plate is located the collection petticoat pipe, and with the collection petticoat pipe encloses out jointly the noise elimination chamber, the runner of water heater body includes the collection petticoat pipe and/or the flue gas runner that Helmholtz resonance silencer injectd, the neck intercommunication flue gas runner with the noise elimination chamber.

6. The gas water heater of claim 5, wherein the base plate comprises:

the side enclosure wall is arranged on the inner side of the smoke collecting hood and limits the smoke flow channel;

a bottom wall connected between the side enclosure wall and the fume collecting hood;

the side enclosure wall, the bottom wall and the smoke collecting hood enclose the silencing cavity together.

7. The gas fired water heater of claim 2, wherein the water heater body includes a flue;

the Helmholtz resonance silencer comprises a bottom plate, wherein the bottom plate is arranged on the pipe wall of the smoke pipe and surrounds the silencing cavity together with the pipe wall of the smoke pipe, a flow passage of the water heater body comprises a smoke exhaust flow passage limited by the smoke pipe and/or the Helmholtz resonance silencer, and the neck is communicated with the smoke exhaust flow passage and the silencing cavity.

8. The gas water heater of claim 7,

the bottom plate is positioned on the inner side of the smoke pipe and limits the smoke exhausting flow passage.

9. Gas water heater according to any one of claims 5 to 8,

the adjusting piece is connected with the bottom plate and used for driving the bottom plate to move relative to the wall of the muffling cavity except the bottom plate so as to change the volume of the muffling cavity.

10. Gas water heater according to any one of claims 2 to 8,

the water heater body further comprises a partition board, the partition board is located in the silencing cavity and divides the silencing cavity into a plurality of sub-silencing cavities which are distributed along the circumferential direction and/or the axial direction of the flow channel of the water heater body, the volumes of at least two sub-silencing cavities are different, and the adjusting piece is connected with the neck or connected with the sub-silencing cavities and used for communicating the neck with the sub-silencing cavities with different volumes.