JPH0650534A - Hot water feeder - Google Patents

Abstract

PURPOSE:To provide a gas hot water feeder in which combustion noise is reduced and occurrence of vibratory combustion is restricted. CONSTITUTION:Combustion sound is detected by a first sensor 18 and a signal having an opposite phase is calculated by a signal processing device 20. Then, a gas pressure control device 13 is controlled with a signal having an opposite phase, a pulsation of opposite phase of the combustion sound is given to combustible gas to realize elimination of vibratory combustion and restriction of combustion sound and thus a gas hot water feeder of low noise can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater having a function of calculating a signal having a phase opposite to the combustion noise of a water heater using gas or the like as a fuel and actively muting the noise. Is.

[0002]

2. Description of the Related Art As a conventional active noise reduction type gas water heater, for example, one having a structure shown in Japanese Patent Laid-Open No. 1-302026 is known. The configuration will be described below with reference to FIGS.
Will be described with reference to.

As shown in FIGS. 4 and 5, a blower 1 for supplying combustion air, a burner section 2 for mixing combustible gas and air, a gas pressure control device 3 for controlling the amount of gas, and a burner unit 3 for combustion. A combustion chamber 5 provided with a heat exchanger 4 for transferring heat to water, an exhaust port 6 for discharging burned exhaust gas to the outside of the device, a detector 8 for detecting vibration acceleration of a wall surface 7 of the combustion chamber 2, and a detector. It is composed of a phase converter 9 for converting the signal of 8 into the opposite phase and a pressurizer 10 for converting the signal of the opposite phase into the pressure. Reference numeral 11 is an antiphase sound source.

In the above structure, the vibration acceleration of the noise generated by combustion is detected by the detector 8 provided on the wall surface 7 of the combustion chamber 5. The signal of the detector 8 is made into an opposite phase by the phase converter, and the opposite phase sound source 11 installed above the exhaust port 6
By radiating to the front surface of the exhaust port 6, the combustion noise is canceled and the noise of the gas water heater is reduced.

[0005]

However, in the above-mentioned conventional structure, it is difficult to reduce the noise because it is a three-dimensional noise suppressing structure for suppressing the generated combustion noise outside the equipment of the gas water heater. Further, there is a problem that combustion noise resonates with the space in the gas water heater and very large noise such as vibration combustion noise cannot be sufficiently suppressed.

The present invention solves the above-mentioned problems. The combustion noise generated when the gas water heater is operated is silenced inside the equipment, a large noise reduction effect is obtained, and abnormal combustion such as oscillatory combustion is eliminated. The first purpose is to do.

A second object of the present invention is to efficiently suppress combustion noise and oscillating combustion by applying a pressure in a phase opposite to that of the combustion noise to the air in the burner portion near the noise source.

[0008]

In order to achieve the first object, a water heater according to the present invention comprises a blower for supplying combustion air, a fuel pressure controller for controlling the amount of combustible gas, and a combustible gas. A burner section that mixes and burns air with air, a heat exchanger that transfers the heat of combustion to water, a combustion chamber that connects the burner section and the heat exchanger, an exhaust port that discharges combustion gas to the outside of the equipment, and a combustion A first detector for detecting pressure fluctuations in the chamber and a signal processing device for taking in a signal of pressure fluctuations of the first detector, calculating a signal of an opposite phase, and outputting the signal to the gas pressure control device are provided. .

In order to achieve the second object, the present invention comprises an amplifier for amplifying a signal from a signal processing device, and a pressure control device for driving the air pressure in the burner section by driving the signal of the amplifier. Is.

[0010]

According to the present invention, the combustion noise in the combustion chamber is detected by the first detector and input to the signal processing device. The signal processing device incorporates an adaptive control algorithm so as to follow up even when the transfer characteristic changes, and calculates the inverse characteristic of the combustion sound in real time. The calculated antiphase signal is fed back to the gas pressure control device, which is upstream of the combustion chamber. The combustible gas is
A pulsation whose phase is 180 degrees out of phase with the combustion sound is generated, mixed with air in the burner section, and then supplied to the combustion chamber. Therefore, the noise generated by the combustion is canceled by the antiphase pulsation of the combustible gas. Further, even when an abnormal sound such as oscillating combustion is generated, the same control as the above operation is performed, and the oscillating combustion is extinguished.

Further, by applying antiphase pulsation of the combustion noise to the air in the burner section by the pressure control device, it is possible to realize the inverse characteristic in a wide band in the vicinity of the combustion chamber with good response.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 2, a sirocco fan 12, which is a blower for supplying combustion air, a proportional valve 13, which is a gas pressure control device for controlling the amount of combustible gas, and a combustible gas and air. Burner 14 for mixing and burning
A heat exchanger 15 that transfers the heat of combustion to water, a combustion chamber 16 that connects the burner unit 14 and the heat exchanger 15, and an exhaust port 17 that discharges combustion gas to the outside of the device. Then, the first microphone 18 which is the first detector for detecting the sound pressure which is the pressure fluctuation of the combustion chamber 16, and the exhaust port 17
Second microphone 19 that is a second detector that detects sound pressure that is pressure fluctuation of the first microphone 18
Of the sound pressure signal is calculated, an opposite phase signal is calculated and output to the gas pressure control device, and the signal of the second detector is acquired to evaluate noise. Here, there is no problem even if at least one of the two detectors for detecting the pressure fluctuation in consideration of heat resistance is used as the vibration pickup.

According to the above construction, the combustion noise generated in the combustion chamber 16 is detected by the first microphone 18 and taken into the signal processing device 20. The signal processing device 20 incorporates an algorithm for calculating an inverse characteristic and an adaptive control algorithm for tracking a varying transfer characteristic, and calculates an antiphase signal of combustion noise in real time. This anti-phase signal is applied to the current of the proportional valve 13 and causes the pressure of the combustible gas to pulsate. Here, by setting the strength of the current applied to the proportional valve 13 to be weak and setting the frequency band to 100 to 200 Hz, which is the main band of the combustion sound, the gas proportional valve 13
It is possible to apply pressure fluctuations to the combustible gas without interfering with the original role of controlling the combustion amount. In this way, by giving the pressure pulsation in the opposite phase to the combustion noise to the combustible gas, the pressure fluctuation generated at the time of combustion is offset, and the combustion noise can be suppressed. In addition, the second microphone 1 is used to evaluate the suppression of combustion noise.
The signal of 9 is used to make a decision by the signal processing device 20. By adopting such a control configuration, it is possible to eliminate the vibration combustion noise generated by the combustion noise resonating with the space inside the gas water heater. Further, because of the feedback control configuration, it is particularly effective for periodic noise, and since the control is performed on the upstream side of the combustion unit, it is not necessary to consider the influence of heat of the control component.

Next, the second invention will be described with reference to FIG. The same parts as those in the above-mentioned embodiment are designated by the same reference numerals, detailed description thereof will be omitted, and different parts will be mainly described. In FIG. 3, a signal of the opposite phase of combustion noise is received from the signal processing device 20 and amplified by the amplifier 21, and the speaker 2 which is the pressure control device is amplified.
2, the pressure pulsation of the opposite phase is given to the air in the burner portion 14. Although the speaker 22 is used as the pressure control device here, a piezoelectric ceramic pressurizer that takes heat resistance into consideration can be used.

According to this structure, in addition to the effects of the above-described embodiment, it is possible to further strongly generate pressure fluctuations in the opposite phase of the combustion noise in the vicinity of the combustion chamber 16 to a wide band, and to control the air. Since the pressure pulsation is supplied as it is as combustion air, it effectively suppresses combustion noise,
Oscillating combustion can also disappear.

[0017]

As described above, the gas water heater according to the present invention detects combustion noise and vibration combustion noise, and gives pulsation in the opposite phase of the noise to the combustible gas, so that the generated combustion noise is generated inside the equipment. Can mute sound and eliminate vibration combustion.

Further, because of the feedback control structure, it is particularly effective against noise having periodicity, and since the control is performed on the upstream side of the combustion section, consideration of the influence of heat of the control parts can be reduced.

Further, according to the present invention, since the anti-phase pulsation of the combustion sound is given to the air in the burner section by the pressure control device, the inverse characteristic of the wide band can be controlled in the vicinity of the combustion chamber with good response,
Combustion noise and vibration combustion can be eliminated efficiently.

[Brief description of drawings]

FIG. 1 is a side sectional view of a gas water heater according to an embodiment of the present invention.

FIG. 2 is a front sectional view of the gas water heater.

FIG. 3 is a side sectional view of a gas water heater including a pressure control device according to another embodiment of the present invention.

FIG. 4 is a side sectional view of a conventional active noise reduction type gas water heater.

FIG. 5 is a front sectional view of the gas water heater.

[Explanation of symbols]

 12 Blower device 13 Gas pressure control device 14 Burner part 15 Heat exchanger 16 Combustion chamber 17 Exhaust port 18 First detector 19 Second detector 20 Signal processing device 21 Amplifier 22 Pressure control device

Claims (2)

[Claims] 1. A blower device for supplying combustion air, a gas pressure control device for controlling the amount of combustible gas, a burner section for mixing and burning combustible gas and air, and a heat exchange for transferring heat from combustion to water. Vessel, a combustion chamber that connects the burner unit and the heat exchanger, an exhaust port that discharges combustion gas to the outside of the device, a first detector that detects a pressure fluctuation in the combustion chamber, and the first A water heater provided with a signal processing device which takes in a signal from a detector, calculates a signal having an opposite phase, and outputs the signal to the gas pressure control device. 2. A water heater according to claim 1, further comprising an amplifier for amplifying a signal from the signal processing device, and a pressure control device driven by the signal from the amplifier to control the air pressure in the burner section.