JPH01247913A - Hot water supply gas heater - Google Patents

Abstract

PURPOSE:To cancel a noise from an exhaust air port and reduce the noise sharply, by installing to the upper part of an exhaust air port a pressure application device which discharge a noise in opposite phase to a noise discharged from said exhaust air port. CONSTITUTION:A pressure receiving device 8 which receives the pressure fluctuation in a combustion chamber is installed to a wall surface of the combustion chamber. Signals transmitted from the pressure receiving device are converted into opposite phase by a phase converter 7 and transmitted to a pressure application device 9 installed to the upper part of a blowout port. The pressure receiving device 8 converts pressure fluctuations into electrical signals while the pressure application device 9 converts electrical signals into the pressure fluctuations of sound. Specific attention must be given to a transmission characteristic H1 which covers the transmission of the pressure fluctuations in the combustion chamber to an exhaust air port so as to turn the sound pressure of the pressure application device into opposite phase. In addition to that, they must be discharged from the pressure application device by including the characteristic H2 of the phase converter and the pressure application device. Therefore, the characteristic of the phase converter H3 is set based on the following equation H3=-H1/H2. Therefore, the noise generated by combustion is canceled by an unavoidable noise discharged from an exhaust air port of a hot water supply gas heater and a false noise discharged by the pressure application device in opposite phase, thereby reducing the noise sharply.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a gas water heater with significantly reduced operating noise.

2. Description of the Related Art Conventionally, as shown in FIGS. 5 and 6, a gas water heater has a blower 1 that supplies combustion air, a gas control device 11 that supplies combustible gas, and a gas water heater that mixes combustible gas and air to produce combustion. It consisted of a burner section 3, a combustion chamber 5 equipped with a heat exchanger 4 for transmitting heat during combustion to water, and an exhaust port 16 for discharging combusted exhaust gas to the outside of the device. Here, 11 is a water pipe,
12 is a gas pipe.

Problems to be Solved by the Invention In this configuration, the gas water heater is sealed except for the exhaust port and the combustion air suction port 15, so that a large amount of noise during combustion is radiated from the exhaust port and the suction port. Ru.

Here, noise radiation towards the front of the gas appliance can be reduced by installing the suction port on the rear or side surface, but the exhaust port must be installed in the front direction due to the installation of the gas water heater, which makes noise noise due to the configuration. It was difficult to take measures to reduce this. In addition, the noise from gas water heaters contains many relatively low-frequency noise components due to acoustic resonance determined by the shapes of the combustion chamber, exhaust passage, and exhaust port, so it is difficult to reduce the noise with sound-absorbing materials and sound-absorbing mufflers. there were.

The present invention solves this conventional problem by providing a pressurizer above the exhaust port that emits sound in phase opposite to the noise emitted from the exhaust port, thereby canceling out the noise from the exhaust port. The purpose is to significantly reduce the noise of gas water heaters.

Means for Solving the Problems The present invention for solving the above problems includes: a blower that supplies combustion air; a burner section that mixes combustible gas with air; a gas control device that controls the supply of combustible gas; A combustion chamber equipped with a heat exchanger that transfers the heat of combustion to water, and an exhaust port that discharges the combusted exhaust gas to the outside of the device are installed on the front of the device body. A phase converter that converts the signal from the pressure device into a negative phase, and a pressurizer that converts the negative phase signal into pressure are installed close to the exhaust port, and the pressure surfaces of the gas exhaust port and the pressurizer are approximately the same. The phase converter has a rectangular shape, and its long sides are installed close to each other, and the phase changer has a sound transmission characteristic H1 between the pressure receiver and the exhaust port, and a sound transmission characteristic H1 between the phase changer and the pressurizer. Characteristic H
The configuration has a transfer characteristic H3 in which the polarity is divided by 2 and the positive and negative polarities are reversed.

Effects According to the above-described configuration, the present invention can be equipped with a pressurizer that emits noise generated by combustion at the upper part of the exhaust port, and emits sound with a phase opposite to that of the noise radiated from the exhaust port. It can be configured as follows. Therefore, based on the principle of directivity of positive and negative phase sound sources, the noise of the gas water heater can be significantly reduced.

Embodiment Hereinafter, one embodiment of the gas water heater of the present invention will be explained in Figs. 1 to 4.
This will be explained using figures.

The gas water heater of the present invention, as shown in FIGS. 1 and 2,
It includes a blower 1 that supplies combustion air, a gas control device 10 that supplies combustible gas, a burner section 3 that mixes and burns combustible gas and air, and a heat exchanger 4 that transmits heat during combustion to water. A pressure receiver 8 is provided on the wall of the combustion chamber to receive pressure fluctuations in the combustion chamber, and a signal from the pressure receiver is reversed by a phase converter 7. The structure is such that the pressure is transmitted as a phase to the pressurizer 9 provided above the outlet. Here, the pressure receiver 8 converts pressure fluctuations into electrical signals, the pressurizer 9 converts the electrical signals into sound pressure fluctuations, 11 is a water pipe, 12 is a gas pipe,
13 is a pressurizing surface of the pressurizer.

In this configuration, the noise generated by combustion is canceled out by the original noise emitted from the exhaust port of the gas water heater and the pseudo noise emitted from the pressurizer, which is in the opposite phase, so that the actual noise of the gas water heater is greatly reduced. The directivity O(θ) of a positive and negative sound source as shown in FIG. 3 is expressed by the following equation.

0(=1SIN(πb/λ(SINI9)))1
Here, θ is the angle from the sound source, b is the distance between the positive and negative sound sources, and λ is the wavelength of the sound.

In the configuration of the present invention, since the exhaust port and the long side of the pressurizing surface are installed close to each other, the distance between the sound sources is very small compared to the wavelength, so b/λ approaches 0, and D
(0) is expressed by the following formula.

0(=SIN(θ)) As is clear from the above equation, the sound in front of the sound source (0=O) is O
becomes. In this way, the directional characteristics of the positive and negative sound sources become stronger, and the noise in front of the gas water heater, which is particularly effective at low frequencies, can be significantly reduced.

In addition, in order to make the sound pressure of the pressurizer have an opposite phase, it is necessary to consider the transmission characteristic H1 until the pressure fluctuation in the combustion chamber is transmitted to the exhaust port, and also take into account the characteristic H2 of the phase converter and the pressurizer. must be radiated from the pressure vessel. Therefore, from the block diagram shown in FIG. 4, the characteristic H3 of the phase converter was set as shown in the following equation.

H3=-81/H2 By setting the phase converter in this way, sound pressure of opposite phase is emitted from the pressurizer, and the directional characteristics of the positive and negative sound sources mentioned above are utilized, and the noise of the gas water heater is significantly reduced. It is possible.

Effects of the Invention As described above, according to the gas water heater of the present invention, the noise generated by combustion can be reduced by providing a pressurizer above the exhaust port that radiates sound in phase opposite to the noise radiated from the exhaust port. Accordingly, it is possible to configure a positive and negative phase sound source, and based on the principle of directivity, the noise of the gas water heater can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a gas water heater according to an embodiment of the present invention;
Figure 2 is a side sectional view of the gas water heater, Figure 3 is a configuration diagram of the positive and negative sound sources, Figure 4 is a bronch diagram of the phase converter of the gas water heater, and Figure 5 is a diagram of the conventional gas water heater. Front sectional view, No. 6
The figure is a side view of the same. 1...Blower, 2...Gas water heater, 3
...burner part, 4... heat exchanger, 5...
Combustion chamber, 6...exhaust port, 7...phase converter, 8...pressure receiver, 9...pressurizer, 10...
...Gas control device. Figure 2 Figure 3 Figure 5 Happy Figure 6

Claims (3)

[Claims] (1) Combustion chamber equipped with a blower that supplies combustion air, a burner unit that mixes combustible gas with air, a gas control device that controls the supply of combustible gas, and a heat exchanger that transfers heat during combustion to water. a pressure receiver having an exhaust port for discharging combusted exhaust gas to the outside of the device on the front of the device body and receiving pressure fluctuations in the combustion chamber; A gas water heater in which a pressurizer that converts a reverse phase signal into pressure is installed close to the exhaust port. (2) The gas water heater according to claim 1, wherein the exhaust port and the pressurizing surface of the pressurizer are rectangular shapes having substantially the same shape, and their long sides are placed close to each other. (3) A patent claim in which the phase converter has a characteristic H3, which is obtained by dividing the sound transmission characteristic H1 between the combustion chamber and the exhaust port by the sound transmission characteristic H2 between the phase converter and the pressurizer, and reversing the sign. A gas water heater according to item 1 in the scope of .