CN111899709A - Damping silencer, gas water heater and control method of gas water heater - Google Patents

Abstract

The invention discloses a damping silencer, a gas water heater and a control method of the gas water heater, wherein the damping silencer comprises at least one group of damping silencing units and an adjusting assembly, each damping silencing unit at least comprises a first silencing sheet and a second silencing sheet which are arranged side by side, a gap is formed between each first silencing sheet and each second silencing sheet, the gap is used for allowing air flow and/or sound to pass through, and the adjusting assembly is connected with the damping silencing units and is used for adjusting the tension force of the damping silencing units. The damping silencer has a simple and ingenious structure, and has a remarkable sound absorption and silencing effect through the resonance sound absorption and silencing of the damping silencing unit; in addition, the tensioning force of the damping noise elimination unit is adjusted through the adjusting assembly, so that the damping muffler can adaptively adjust the sound absorption and noise elimination frequency band, and the adaptability and the accurate noise reduction effect of the damping muffler are improved.

Description

A damping muffler, gas water heater and control method thereof

technical field

The invention relates to the technical field of water heaters, in particular to a noise reduction technology for gas water heaters.

Background technique

Gas water heaters are widely recognized by consumers for their advantages of energy saving and environmental protection, but the noise problem of gas water heaters during operation is also troubling. It is understood that the national standard requires that the noise of gas water heaters when burning is not greater than 65 decibels, while the noise emitted by ordinary gas water heaters is generally above 55 decibels. According to medical experimental data, the noise level is more than 50 decibels, which is equivalent to people talking loudly, which affects normal life; 60-70 decibels is equivalent to standing on the endless road, which will make people upset and distracted; more than 90 decibels It is equivalent to being in a noisy bar. If you live in such a noisy environment for a long time, it will seriously affect your hearing and lead to the occurrence of other diseases such as cardiovascular and vascular diseases.

With the improvement of people's requirements for the quality of life, users pay more and more attention to the noise parameters of gas water heaters when purchasing gas water heaters, which makes the quality of noise performance a key factor affecting the competitiveness of products. Therefore, noise has become an urgent technical problem to be solved in existing gas water heaters.

In addition, the existing noise reduction measures such as sound-absorbing cotton and sound insulation and sound absorption cannot be adaptively adjusted according to the noise frequency band, and the adaptability is poor, the noise reduction effect is poor, and the user experience is affected.

SUMMARY OF THE INVENTION

The present invention aims to solve one of the problems existing in the related art at least to a certain extent. To this end, the present invention proposes a damping muffler, which has a simple and ingenious structure, has a significant sound absorption and muffler effect, and can adapt to The sound absorption and muffler frequency band of the damping muffler can be adjusted freely, and the adaptability is stronger.

The invention also provides a gas water heater with the damping muffler, which can significantly reduce noise and other indicators of the gas water heater, improve user experience, and enhance the competitiveness of the company's products.

The invention also provides a control method for a gas water heater. By linking the damping muffler with the fan, the sound absorption and muffler frequency band of the damping muffler can be adjusted according to the working parameters of the fan, so as to improve the adaptability and pertinence of the product, and significantly Improve the noise reduction effect of the water heater and improve the user experience.

According to the damping muffler provided above, it is realized by the following technical solutions:

A damping muffler, the damping muffler comprises at least one set of damping and muffling units and an adjustment assembly, the damping and muffling unit at least includes a first muffler sheet and a second muffler sheet arranged side by side, the first muffler A gap is formed between the sheet and the second muffler sheet, the gap is used for air flow and/or sound to pass through, and the adjustment assembly is connected with the damping muffler unit for adjusting the damping muffler unit tension.

In some embodiments, the thickness of the first sound-absorbing sheet is 500 μm˜2000 μm, and the thickness of the second sound-absorbing sheet is less than or equal to the thickness of the first sound-absorbing sheet.

In some embodiments, the damping and sound-absorbing unit further includes a third sound-absorbing sheet, the third sound-absorbing sheet is arranged side by side on a side of the second sound-absorbing sheet away from the first sound-absorbing sheet, and A gap is formed between the third muffler sheet and the second muffler sheet.

In some embodiments, the thickness of the third muffler sheet is greater than or equal to the thickness of the second muffler sheet, and the thickness of the second muffler sheet is greater than or equal to the thickness of the first muffler sheet.

In some implementations, the adjusting assembly includes a telescopically movable adjusting bracket and a driver, and several groups of the damping and muffling units are arranged side by side in the adjusting bracket, and two ends of the damping and muffling units are respectively connected to the The two opposite side walls in the adjusting bracket, the gap is formed between the adjacent two groups of the damping and muffler units, the driver is connected with the adjusting bracket, and is used to drive the adjusting bracket to perform telescopic movement, so The movement of the adjusting bracket can adjust the tension of the damping and muffler unit.

In some embodiments, the adjustment bracket includes a first adjustment bracket and a second adjustment bracket, two ends of the damping and muffler unit are respectively connected to the first adjustment bracket and the second adjustment bracket, and the driver is connected to the The first adjustment bracket or the second adjustment bracket is connected to drive the first adjustment bracket and the second adjustment bracket to move relatively.

In some embodiments, the adjustment assembly further includes a detection unit, the detection unit is disposed on the adjustment bracket, and is used to detect the magnitude of the tension force of the damping and muffler unit.

According to a gas water heater provided above, it is realized through the following technical solutions:

A gas water heater, comprising a water heater body, a burner, a fan and a controller, the water heater body is provided with an air intake channel and a smoke exhaust channel, the air intake channel and the smoke exhaust channel are respectively connected to the inlet and outlet of the burner. A gas port and a smoke exhaust port, further comprising the damping muffler as described above, between the air intake passage and the air inlet of the burner and/or the smoke exhaust passage and the smoke exhaust of the burner The damping muffler is installed between the ports, and the controller is respectively electrically connected with the fan and the adjusting assembly of the damping muffler.

According to the control method of a gas water heater provided above, it is realized through the following technical solutions:

A control method of a gas water heater, which applies the above gas water heater, and the control method includes the steps:

S1: The gas water heater starts to work;

S2: Obtain working parameters of the fan, wherein the working parameters include fan speed or fan driving voltage;

S3: Compare the acquired working parameter with at least one reference value, and control the working state of the damping muffler based on the comparison result.

In some embodiments, in step S3, the reference value includes a minimum value and a maximum value. If the obtained working parameter≤minimum value, the damping and noise reduction mode is not enabled; if the obtained working parameter ∈ (the minimum value , maximum value], the damping noise reduction mode is turned on, and the tension force of the damping muffler is adjusted according to the working parameters of the fan; if the working parameters of the fan > the maximum value, the damping noise reduction mode is turned on, and the tension of the damping muffler is Adjust the force to the maximum.

Compared with the prior art, the present invention at least includes the following beneficial effects:

1. The damping muffler of the present invention has a simple and ingenious structure, and the damping muffler has a remarkable sound absorption and muffler effect through the resonance sound absorption and noise reduction of the damping muffler unit;

2. Adjust the tension of the damping and muffler unit by adjusting the components, so that the damping muffler can adjust its sound absorption and muffler frequency band adaptively, and improve the adaptability and precise noise reduction effect of the damping muffler.

Description of drawings

1 is a schematic structural diagram of a damping muffler in an embodiment of the present invention;

2 is a schematic structural diagram of a damping muffler unit and a connector in an embodiment of the present invention;

Fig. 3 is the partial structure schematic diagram of 2 gas water heaters in the embodiment of the present invention;

FIG. 4 is a flow chart of a control method for a 3 gas water heater in an embodiment of the present invention.

Detailed ways

The following examples illustrate the present invention, but the present invention is not limited by these examples. Modifications to the specific embodiments of the present invention or equivalent replacement of some technical features without departing from the spirit of the solution of the present invention shall all be included in the scope of the technical solution claimed in the present invention.

The noise of gas water heaters is mainly combustion noise and fan noise, and the peak of combustion noise accounts for the main part of gas water heaters. The frequency band of the combustion noise is wide, and it has obvious peak components in the low frequency range. During the combustion process, if the combustible gas and air are in the optimal mixing state, the combustion roar has the highest peak frequency. , the peak frequency of the roar will move down, and most of the sound energy of the burning roar is concentrated between 150 and 600 Hz. Research shows that the peak noise band of gas water heaters is mainly concentrated between 150Hz and 600Hz, which belongs to the low frequency band.

For low-frequency noise, its wavelength is longer and can easily bypass obstacles. Traditional sound-absorbing cotton has a good noise reduction effect on high-frequency noise, but has a poor effect on low-frequency noise. Therefore, sound-absorbing cotton and sound insulation and sound absorption are routinely used. Noise reduction measures are difficult to reduce noise.

Example 1

As shown in FIGS. 1-2 , this embodiment provides a damping muffler. The damping muffler 100 includes at least one set of damping and muffling units 1 and an adjustment assembly 2 , and the damping and muffler unit 1 includes at least a first muffler arranged side by side. The sheet 11 and the second muffler sheet 12, a gap 101 is formed between the first muffler sheet 11 and the second muffler sheet 12, and the gap 101 is used for air flow and/or sound to pass through, when the air flow and/or sound pass through the damping When the gap 101 of the muffler 100 is placed, the resonance of the first muffler sheet 11 and the second muffler sheet 12 is caused, so as to achieve the purpose of sound absorption and noise reduction. The adjustment component 2 is connected with the damping and muffler unit 1, and is used to adjust the tension force of the damping and muffler unit 1. In this way, the tension force of the damping and muffler unit 1 can be adjusted by adjusting the component 2 according to the noise frequency band, so as to achieve adaptability Adjusting the sound absorption and muffler frequency band of the damping muffler 100 improves the adaptability and pertinence of the damping muffler 100, and significantly improves the noise reduction effect.

It can be seen that the damping muffler of this embodiment has a simple and ingenious structure, and the damping muffler 100 has a significant sound absorption and muffler effect through the resonance sound absorption and noise reduction of the damping muffler unit 1 ; The tensioning force of the damping and muffler unit 1 enables the damping muffler 100 to adaptively adjust its sound absorption and muffler frequency band, thereby improving the adaptability and precise noise reduction effect of the damping muffler 100 .

Preferably, the number of groups of damping and muffler units 1 is greater than 2, and a gap 101 for air flow and/or sound to pass through is formed between the adjacent two groups of damping and muffler units 1, so that the porosity of the damping muffler 100 is increased, and the The unit ventilation volume and the sound absorption and muffler channel further strengthen the sound absorption and muffler effect; at the same time, the damping muffler 100 can play the effect of rectification and air combing.

Preferably, the thickness of the first muffler sheet 11 is 500 μm˜2000 μm, and the thickness of the second muffler sheet 12 is less than or equal to the thickness of the first muffler sheet 11 . In this embodiment, the thickness of the second muffler sheet 12 is 10 μm˜500 μm, so the resonance frequency generated by the first muffler sheet 11 is lower than the resonance frequency generated by the second muffler sheet 12 , and the first muffler sheet 11 can Low-frequency noise is sound-absorbing and sound-absorbing, and the second sound-absorbing sheet 12 can absorb and sound-absorbing medium-frequency or high-frequency noise, thereby improving the sound-absorbing and sound-absorbing sound section of the damping muffler 100 .

In other embodiments, the thickness of the second muffler sheet 12 may be 500 μm˜2000 μm, so that the damping muffler unit 1 (ie, the damping muffler 100 ) is dedicated to the sound absorption and muffler processing of low-frequency noise.

As shown in FIG. 2 , further, the damping muffler unit 1 further includes a third muffler sheet 13 , and the third muffler sheets 13 are arranged side by side on the side of the second muffler sheet 12 away from the first muffler sheet 11 , and Air supply and/or sound is formed between the third muffler sheet 13 and the second muffler sheet 12 , and between the third muffler sheet 13 and the first muffler sheet 11 of the adjacent group of damping muffler units 1 . through the gap 101 . Therefore, the arrangement of the third muffler sheet 13 further improves the porosity and the sound absorption and muffling effect of the damping muffler 100 .

Preferably, the thickness of the third muffler sheet 13 is less than or equal to the thickness of the second muffler sheet 12 , and the thickness of the second muffler sheet 12 is smaller than or equal to the thickness of the first muffler sheet 11 . Specifically, the thickness of the third muffler sheet 13 is 10 μm-100 μm, the thickness of the second muffler sheet 12 is 100 μm to 500 μm, and the thickness of the first muffler sheet 11 is 500 μm to 2000 μm, so that the third muffler sheet 13 produces The resonant frequency is greater than the resonant frequency generated by the second muffler sheet 12, and the third muffler sheet 13 can absorb and muffle high-frequency noise, so that each group of damping muffler units 1 can absorb low, medium and high frequency noise. The sound absorption and noise reduction treatment is carried out, the noise reduction range is wide, and the noise reduction effect of the damping muffler 100 is significantly improved.

More preferably, the manufacturing material of the first muffler sheet 11 , the second muffler sheet 12 and the third muffler sheet 13 is any one of flame retardant film, flame retardant paper and artificial leather.

As shown in FIG. 1 , specifically, the adjusting assembly 2 includes a telescopically movable adjusting bracket 21 and a driver (not shown in the figure), and several groups of damping and muffling units 1 are arranged side by side in the adjusting bracket 21 . The damping and muffling units The two ends of 1 are respectively connected to the opposite two side walls in the adjustment bracket 21, a gap 101 is formed between the adjacent two groups of damping and muffler units 1, and the driver is connected with the adjustment bracket 21 for driving the adjustment bracket 21 along the damping and muffler. The unit 1 performs telescopic motion in the length direction, and the movement of the adjusting bracket 21 drives each group of damping and muffling units 1 to move, thereby realizing the adjustment of the tension force of the damping and muffling units 1 . In this way, the damping muffler 100 can control the telescopic motion of the adjustment assembly 2 through the driver according to the noise frequency band, thereby realizing the adjustment of the tension force of the damping muffler unit 1 through the adjustment assembly 2, and improving the adaptability of the damping muffler 100 to the noise frequency band. , the sound absorption and noise reduction frequency band is highly targeted, and the precise noise reduction effect is more significant.

More specifically, the adjustment bracket 21 includes a first adjustment bracket 211 and a second adjustment bracket 212. Both ends of the damping and muffler unit 1 are respectively connected to the first adjustment bracket 211 and the second adjustment bracket 212. The driver is connected to the first adjustment bracket 211 or The second adjusting bracket 212 is connected to drive the first adjusting bracket 211 and the second adjusting bracket 212 to move relatively. When the driver drives the first adjustment bracket 211 and the second adjustment bracket 212 to move away from each other, the tension force of the damping and muffler unit 1 increases, the higher the resonance frequency, the higher the noise frequency band that can be sound-absorbing and muffling. Improve the noise reduction effect of high frequency noise. When the driver drives the first adjustment bracket 211 and the second adjustment bracket 212 to move in the approaching direction, the tension force of the damping and muffler unit 1 becomes smaller, the resonance frequency becomes lower, and the noise frequency band for sound absorption and muffling becomes lower, so that the Improve the noise reduction effect of low frequency noise. It can be seen that by driving the first adjustment bracket 211 and the second adjustment bracket 212 to move relative to each other, the damping muffler 100 can change its main sound absorbing and muffler segment, with wider noise reduction adaptability and better targeted and precise noise reduction.

In this embodiment, the adjusting bracket 211 includes a first connecting rod 2111 and at least one first telescopic rod 2112 connected to each other, and the second adjusting bracket 212 includes a second connecting rod 2121 and at least one second telescopic rod 2122 that are connected to each other. The number of the second telescopic rods 2122 is the same as the number of the first telescopic rods 2112 , and the second telescopic rods 2122 and the first telescopic rods 2112 are telescopically connected. Two ends of the damping and muffler unit 1 are respectively connected to the first connecting rod 2111 and the second connecting rod 2121 .

Preferably, the number of the first telescopic rods 2112 is two, and the two first telescopic rods 2112 are respectively disposed at opposite ends of the same side of the first connecting rod 2111 , so that the first adjusting bracket 211 is in a "concave" shape. Correspondingly, the number of the second telescopic rods 2122 is also two, and the number of the two second telescopic rods 2122 are respectively arranged at opposite ends of the same side of the second connecting rod 2121 , so that the second adjusting bracket 212 is also “concave”. " font. When the first telescopic rod 2112 and the second telescopic rod 2122 are telescopically connected, the first adjustment bracket 211 and the second adjustment bracket 212 together define an accommodating cavity suitable for accommodating several groups of damping and muffler units 1, each group of damping mufflers Two ends of the acoustic unit 1 are respectively connected to two opposite inner side walls of the accommodating cavity.

As shown in FIG. 1 , the adjustment assembly 2 further includes a detection unit 22 . The detection unit 22 is arranged on the adjustment bracket 21 and is used to detect the tension force of the damping and muffler unit 1 . In this way, the detection unit 22 can accurately detect the Detecting the tension force of the damping muffler 100 is beneficial to improve the control precision of the damping muffler 100 .

Further, a connecting piece 3 is also included, and the two ends of the damping and muffling unit 1 are respectively connected with the opposite two side walls in the adjusting bracket 21 through the connecting piece 3 . Specifically, the connecting piece 3 is a connecting block, and connecting blocks are fixedly installed at both ends of the damping and muffling unit 1 respectively, and the two connecting blocks located at both ends of the damping and muffling unit 1 are respectively connected to the first connecting rod of the first adjusting bracket 211 . 2111, the second connecting rod 2121 of the second adjusting bracket 212, in this way, the damping and muffling unit 1 and the two connecting blocks at both ends of the damping and muffling unit 1 form a whole, which is more convenient for the quick assembly of the damping and muffling unit 1, and at the same time It is convenient to connect both ends of the damping muffler unit 1 with the first adjusting bracket 211 and the second adjusting bracket 212 .

Example 2

As shown in FIG. 3 , this embodiment provides a gas water heater, including a water heater body (not shown in the figure), a burner 200 , a fan (not shown in the figure) and a controller (not shown in the figure) , the water heater body is provided with an intake channel and a smoke exhaust channel, and the intake channel and the smoke exhaust channel are respectively connected to the intake port and the exhaust port of the burner 200, which also includes the damping muffler as described in Embodiment 1. A damping muffler is installed between the air passage and the air inlet of the burner 200 and/or between the smoke exhaust passage and the smoke exhaust port of the burner 200 , and the controller is electrically connected to the blower and the adjusting assembly 2 of the damping muffler, respectively. Since the structure of the damping muffler 100 has been described in detail, concrete and clear in Embodiment 1, it will not be repeated here.

Specifically, the intake passage includes a gas intake passage and an air intake passage, between the gas intake passage and the intake port of the burner 200 and/or between the air intake passage and the intake port of the burner 200 A damping muffler 100 is installed. The electrical connection includes electrical connection and communication connection, wherein the communication connection includes wireless communication connection and wired communication connection.

It can be seen that in the gas water heater of this embodiment, the damping muffler 100 is installed between the intake passage and the intake port of the burner 200 and/or between the smoke exhaust passage and the smoke exhaust port of the burner 200. When the combustion noise and/or smoke exhaust noise spreads outward, the resonance of the damping muffler 100 is induced to achieve the effect of sound absorption and noise reduction, which can significantly reduce the noise and other indicators of the gas water heater, improve the user experience, and enhance the company's product competitiveness; According to the combustion noise and/or smoke exhaust noise of the gas water heater, the tension force of the damping and muffler unit 1 of the damping muffler 100 is adaptively adjusted, and then the sound absorption and muffling frequency band of the damping muffler 100 is adjusted to improve the adaptability of noise reduction processing, and achieve The purpose of targeted and precise noise reduction.

Example 3

As shown in FIG. 4 , this embodiment provides a control method for a gas water heater, which applies the gas water heater described in Embodiment 2, and the control method includes the steps:

S1: The gas water heater starts to work;

S2: Obtain the working parameters of the fan, wherein the working parameters include the fan speed or the fan driving voltage;

Specifically, the gas water heater further includes a fan detector for monitoring the fan speed or the fan driving voltage, the fan detector is electrically connected to the controller, the fan speed or the fan driving voltage is monitored by the fan detector, and the monitored signal Feedback to the controller so that the controller can issue corresponding commands.

S3: Compare the acquired working parameter with at least one reference value, and control the working state of the damping muffler based on the comparison result.

Specifically, the reference value includes a minimum value and a maximum value. If the obtained working parameter is less than or equal to the minimum value, the damping and noise reduction mode is not turned on, indicating that the fan speed or driving voltage of the fan is low at this time, and the combustion noise of the water heater is low. The water heater can work in the normal mode, and there is no need to increase the tension of the damping muffler for noise reduction. If the obtained working parameters ∈ (minimum, maximum), the damping and noise reduction mode is turned on, and the tensioning force of the damping muffler is adjusted according to the working parameters of the fan, so as to realize the adaptability and pertinence according to the frequency band of the combustion noise of the water heater. Adjust the sound absorption and muffling frequency band to improve the accurate noise reduction effect. If the working parameters of the fan > the maximum value, it means that the fan speed is fast, the water heater burns violently, and the higher the proportion of high-frequency combustion noise, the damping noise reduction mode needs to be turned on, and the The tension of the damping muffler is adjusted to the maximum to improve the noise reduction effect on the high frequency noise of combustion.

It can be seen that the control method for a gas water heater in this embodiment obtains the working parameters of the fan, compares the obtained working parameters with at least one reference value, and controls the working state of the damping muffler based on the comparison result, thereby realizing According to the combustion noise generated by the water heater, adaptively adjust the sound absorption and muffler frequency band of the damping muffler, improve the adaptability of the water heater noise reduction treatment, achieve the purpose of targeted accurate noise reduction and efficient noise reduction, improve the user experience, and enhance the company's Product competitiveness.

Preferably, the controller automatically adjusts the tension force of the damping muffler according to the driving voltage of the fan. The specific adjustment method is shown in Table 1:

Table 1 Relationship between fan driving voltage and tensioning force of damping muffler

Fan drive voltage Tension of the damping muffler Fan drive voltage≤1V Do not turn on damping noise reduction mode 1V＜Fan drive voltage≤1.5V 100N 1.5V＜Fan drive voltage≤2V 150N 2V＜Fan drive voltage≤3V 200N 3V＜Fan drive voltage≤4V 250N 4V＜Fan drive voltage 300N

It can be seen from Table 1 that according to the size of the fan driving voltage, the tension of the damping muffler can be adjusted appropriately, and the damping muffler has 5 tension adjustment stages. When the tension force of the damping muffler is higher, the sound absorption and noise reduction ability of high frequency noise is stronger, and vice versa, the sound absorption and noise reduction effect of low frequency noise is better.

More preferably, in step S3, if the damping noise reduction mode is turned on, the controller continues to judge whether to exit the damping noise reduction mode, if so, exit the damping noise reduction mode, if not, continue to automatically adjust the damping muffler according to the fan drive voltage. The amount of tension.

Specifically, the controller continuously judges whether to exit the damping and noise reduction mode by judging whether the fan driving voltage is less than or equal to the minimum value (ie 1V), and if so, automatically exits the damping and noise reduction mode; or, by judging whether the user has passed the gas water heater operation function to exit the damping noise reduction mode.

The foregoing are merely some of the embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention.

Claims (10)

1. A damping muffler, characterized in that the damping muffler (100) comprises at least one set of damping and muffling units (1) and an adjustment assembly (2), the damping and muffler units (1) comprising at least one set of side-by-side A first muffler sheet (11) and a second muffler sheet (12), a gap (101) is formed between the first muffler sheet (11) and the second muffler sheet (12), the The gap (101) is used for air flow and/or sound to pass through, and the adjusting assembly (2) is connected with the damping and muffling unit (1) for adjusting the tension force of the damping and muffling unit (1). 2. A damping muffler according to claim 1, characterized in that, the thickness of the first muffler sheet (11) is 500 μm˜2000 μm, and the thickness of the second muffler sheet (12) is less than or equal to The thickness of the first muffler sheet (11). 3. The damping muffler according to claim 1, wherein the damping muffler unit (1) further comprises a third muffler sheet (13), and the third muffler sheets (13) are arranged side by side on the side of the second muffler sheet (12) away from the first muffler sheet (11), and between the third muffler sheet (13) and the second muffler sheet (12) A gap (101) is formed. The damping muffler according to claim 3, characterized in that the thickness of the third muffler sheet (13) is greater than or equal to the thickness of the second muffler sheet (12), and the second muffler sheet (12) has a thickness. The thickness of the muffler sheet (12) is greater than or equal to the thickness of the first muffler sheet (11). 5. A damping muffler according to any one of claims 1-4, characterized in that, the adjusting assembly (2) comprises a telescopically movable adjusting bracket (21) and a driver, wherein the adjusting bracket (21) 21) Several groups of the damping and muffling units (1) are arranged side by side, and the two ends of the damping and muffling units (1) are respectively connected to the opposite two side walls in the adjusting bracket (21), and two adjacent groups are connected. The gap (101) is formed between the damping and muffler units (1), the driver is connected with the adjusting bracket (21), and is used to drive the adjusting bracket (21) to perform telescopic movement, and the adjusting The movement of the bracket (21) can adjust the tension force of the damping and muffling unit (1). 6. The damping muffler according to claim 5, wherein the adjusting bracket (21) comprises a first adjusting bracket (211) and a second adjusting bracket (212), and the damping and muffler unit (1) ) are respectively connected to the first adjustment bracket (211) and the second adjustment bracket (212), and the driver is connected to the first adjustment bracket (211) or the second adjustment bracket (212) , for driving the first adjustment bracket (211) and the second adjustment bracket (212) to move relative to each other. 7 . The damping muffler according to claim 5 , wherein the adjustment assembly ( 2 ) further comprises a detection unit ( 22 ), and the detection unit ( 22 ) is arranged on the adjustment bracket ( 21 ). 8 . , which is used to detect the magnitude of the tension force of the damping and muffling unit (1). 8. A gas-fired water heater, comprising a water heater body, a burner (200), a fan and a controller, wherein the water heater body is provided with an air intake channel and a smoke exhaust channel, and the air intake channel and the smoke exhaust channel are respectively communicated with each other. The intake port and the smoke exhaust port of the burner (200), characterized in that, further comprising the damping muffler according to any one of claims 1-7, in the intake passage and the burner (200) The damping muffler is installed between the air inlets of ) and/or between the smoke exhaust passage and the smoke exhaust port of the burner (200), and the controller is respectively connected with the fan and the damping muffler. The adjustment component (2) is electrically connected. 9. A control method for a gas-fired water heater, wherein the gas-fired water heater as claimed in claim 8 is applied, and the control method comprises the steps of: S1: The gas water heater starts to work; S2: Obtain working parameters of the fan, wherein the working parameters include fan speed or fan driving voltage; S3: Compare the acquired working parameter with at least one reference value, and control the working state of the damping muffler based on the comparison result. 10 . The method for controlling a gas water heater according to claim 9 , wherein in step S3 , the reference value includes a minimum value and a maximum value, and if the obtained working parameter is less than or equal to the minimum value, it is not turned on. 11 . Damping noise reduction mode; if the obtained working parameters ∈ (minimum, maximum value), the damping noise reduction mode is turned on, and the tension of the damping muffler is adjusted according to the working parameters of the fan; if the working parameters of the fan > the maximum value , the damping noise reduction mode is turned on, and the tension of the damping muffler is adjusted to the maximum.

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