JPH01302026A - Combustion device - Google Patents

Abstract

PURPOSE:To provide a substantial reduction of noise by a method wherein a vibrating acceleration of a wall surface of a combustion chamber is detected, its output signal is converted into a pressure near a part of a discharging port under a reversed phase. CONSTITUTION:In a gas hot water feeder provided with an air blower 1, a gas controlling device 10, a burner part 3, a combustion chamber 5 having a heat exchanger 4 and a discharging port 6, a sensor 8 for use in detecting a variation of a vibratory acceleration at a wall surface of the combustion chamber is provided at a wall surface 17 of the combustion chamber so as to cause a signal from the sensor to be transmitted as a reversed phase with a phase convertor 7 to a pressurizing device 9 mounted above a discharging port 6. A sensor 8 may change the variation of vibratory acceleration into an electrical signal and a pressurizing device 9 receiving this electrical signal may convert the electrical signal into a variation of pressure of sound. With this arrangement, noise generated by combustion is compensated by natural noise radiated from the discharging port 6 of the gas hot water feeder and a pseudo-noise radiated from the pressurizing device 9 having a reverse phase and then substantial noise of the gas hot water feeder is substantially reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a combustor, such as a gas water heater, which has significantly reduced operating noise.

2. Description of the Related Art Conventionally, as shown in FIGS. 7 and 8, a gas water heater has a blower 1 that supplies combustion air, a gas control device 10 that supplies combustible gas, and a gas water heater that mixes combustible gas and air to create a twisted state. 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 suction port 16 for combustion air. A lot of radiation is emitted. Here, noise radiation toward the front of the gas appliance can be reduced by providing the suction port 16 on the rear or side surface, but the exhaust port 16 must be installed in the front direction due to the installation of the gas water heater. Due to the structure, it was difficult to take measures to reduce noise. 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.
It has been difficult to reduce noise using sound-absorbing materials and mufflers.

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

Means for Solving the Problems In order to solve the above problems, the present invention comprises: a blower that supplies combustion air; a burner section that burns combustible gas mixed with air; and a control device that controls the supply of charcoal. , a combustion chamber equipped with a heat exchanger that transfers heat during combustion to water, etc., and an exhaust port for discharging combusted exhaust gas to the outside of the device, the exhaust port being provided on the front of the device body, and on the wall of the combustion chamber. A detector that detects vibration acceleration, a phase converter that makes the signal of the detector have an opposite phase, and a pressurizer that converts the antiphase signal into pressure are provided, and this pressurizer is placed close to the exhaust port. .

Effect: With the above-described configuration, the present invention cancels out the noise generated by combustion at the front of the exhaust port and the pressurizer using an anti-phase sound source installed above the exhaust port, thereby significantly reducing the noise of the gas water heater. It is something.

Furthermore, in gas water heaters that contain many low-frequency noise components, the effect of the anti-phase sound source can be maximized by installing the exhaust port and the pressurizer close to each other.

Embodiment Hereinafter, one embodiment of the gas water heater of the present invention will be explained in Figs. 1 to 6.
This will be explained using figures.

The gas water heater 2 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 combustion chamber 5, an exhaust port 6 for discharging the burned exhaust gas to the outside of the device, and a detector 8 on the combustion chamber wall surface 17 for detecting vibration acceleration fluctuations on the wall surface of the combustion chamber,
The signal from the detector is made to have an opposite phase by a phase converter 7 and is transmitted to a pressurizer 9 provided above the exhaust port. Here, the vibration acceleration detector is installed either directly on the wall surface 17 of the combustion chamber 5 as shown in FIG. Although it is conceivable that the sensor may be attached to the case 718 for non-contact measurement, only the former case of direct attachment will be described in this embodiment. The detector 8 converts the vibration acceleration fluctuation into an electric signal, and the pressurizer e that receives this converts the electric signal into a sound pressure fluctuation. 11 is a water pipe, 12 is a gas pipe, and 13 is a pressurizer. It is a pressure surface.

In such a configuration, the noise generated by combustion is the original noise emitted from the exhaust port 6 of the gas water heater, and
The actual noise of the gas water heater is greatly reduced by being offset by the pseudo noise emitted from the pressurizer 9 of opposite phase. Fifth
The directivity D(
θ) is expressed by the following formula.

D(θ)=lSIN(πb/λ(SIN(011)1) where θ is the angle from the sound source, b is the distance between the positive and negative sound sources,
λ is the wavelength of sound.

From the above equation, the sound in front of the sound source (θ = 0) is 0.
Therefore, it is reduced. In the configuration of the present invention, since the exhaust port 6 and the long side of the pressurizing surface 13 are installed close to each other, the distance between the sound sources is very small compared to the wavelength λ, so b/λ approaches 0. , the directional characteristics of the positive and negative sound sources become stronger, and noise can be significantly reduced. In this way, in a gas water heater that contains many noise components at low frequencies, noise can be effectively reduced by the configuration of the positive and negative sound sources described above.

Here, the pseudo noise from the pressurizer uses the output signal of vibration acceleration as a signal, so even if the pseudo noise returns from the exhaust port and is transmitted into the combustion chamber, its sound pressure level is extremely low. , it is not detected by a vibration acceleration detector that detects through the wall of the combustion chamber. Thus, the signal closed loop circuit.

Since there is no oscillation caused by (detector→pressurizer→detector) and no pseudo noise howling phenomenon occurs, noise can be muted stably.

In addition, in order to make the sound pressure of the pressurizer have an opposite phase, it is necessary to consider the transfer characteristic H1 until pressure fluctuations in the combustion chamber are transmitted to the exhaust port, and the transfer characteristic H2 from the detector to the pressurizer. must be radiated.

Therefore, from the block diagram shown in FIG. 6, the characteristic H3 of the phase converter was set as shown in the following equation.

H3=-H1/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 combustor of the present invention, a pressurizer that emits sound in phase opposite to the noise emitted from the exhaust port is installed close to the top of the exhaust port. By guiding the signal from the vibration acceleration detector, it is possible to effectively and stably obtain the directional characteristics of the positive and negative phase sound sources, significantly reducing noise from gas water heaters, etc. that contain many low frequency components. You can do this.

[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 same gas water heater, Figures 3 and 4 are side views of the detector installation of the same gas water heater, Figure 5 is a configuration diagram of the positive and negative sound sources, and Figure 6 is A block diagram of the phase converter of the same gas water heater, Figure 7 is a front sectional view of the conventional gas water heater,
FIG. 8 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, 8.14...Detector, 9...
...pressurizer, 10... gas control device (control device). Name of agent: Patent attorney Toshio Nakao and 1 other person 4-
-Sweeping out Yokobean 5-Eleventh seat parent! g ----pp air mouth ym 口

Claims (1)

[Claims] (1) Equipped with a blower that supplies combustion air, a burner unit that burns combustible gas mixed 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 combustion chamber and an exhaust port for discharging the burned exhaust gas to the outside of the device are provided on the front side of the device, and a detector that detects the vibration acceleration of the wall surface of the combustion chamber, and a phase conversion that makes the signal of the detector have an opposite phase. and a pressurizer for converting the anti-phase signal into pressure, which is installed in close proximity to the exhaust port.