JPH01302022A - Combustion device - Google Patents

Abstract

PURPOSE:To prevent a vibratory combustion generated by a smaller-sized combustion chamber by a method wherein the number of revolutions of a blower is increased or decreased in proportion to an increased or a decreased pressure within the combustion chamber detected by a pressure sensor arranged at an outer wall of the combustion chamber. CONSTITUTION:Air is supplied by an air blower 1 into an air supplying chamber 2 and fuel is supplied by a nozzle 3 into a burner 4. The fuel is burned within a combustion chamber 5 and then it passes through a heat exchanger 6 and is discharged through a discharging cylinder 7. A pressure sensor 8 arranged at an outer wall of the combustion chamber 5 may detect a pressure within the combustion chamber and transmit it to a controlling device 9. The controlling device 9 may increase or decrease the number of revolution of the air blower 1 in proportion to an increased pressure or a decreased pressure within the combustion chamber 5 so as to control an amount of air. In this type of hot water feeding device, even if a variation of pressure is generated within the combustion chamber 5, an amount of air is not varied and then a vibratory combustion can be restricted without having any resonance of a pressure variation caused by a combustion reaction to a specific number of vibration found in the combustion device.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion device for a high-load water heater that prevents and reduces oscillatory combustion that occurs as the combustion chamber of the water heater becomes smaller.

BACKGROUND ART As shown in FIG. 2, a conventional combustion device for a water heater of this type includes, from the bottom of the combustion device, a blower 1, an air supply chamber 2, a nozzle V3, a burner 4, a combustion chamber 5, and a heat exchanger. container 6, exhaust pipe 7
The combustion air is supplied from the blower 1 to the air supply chamber 2, the burner 4 is supplied, and the fuel is supplied to the nozzle 3.
After the combustion is completed in the combustion chamber 5, the gas is exhausted from the exhaust pipe 7 via the heat exchanger 6.

Problems to be Solved by the Invention However, with the above configuration, when the combustion device is downsized and the combustion load is increased, pressure fluctuations due to the combustion reaction resonate with the natural frequency of the combustion device, causing oscillatory combustion. had.

The present invention solves such conventional problems and aims to suppress oscillatory combustion.

Means for Solving the Problems In order to solve the above problems, the combustion apparatus of the present invention includes a blower for supplying combustion air, an air supply chamber located downstream of the blower, a burner built in the air supply chamber, and a burner. a combustion chamber located downstream of the combustion chamber, a pressure sensor installed on the outer wall of the combustion chamber, and a controller that controls the blower to increase or decrease the rotation speed in proportion to the increase or decrease in combustion chamber pressure detected by the pressure sensor. It consists of

For production The present invention will be explained in detail using FIG.

When the combustion device starts oscillatory combustion, pressure fluctuations in the entire combustion device, especially in the combustion chamber, become large. First, when the pressure increases, the equipment resistance increases from the solid line to the broken line, the operating point moves from a to b, and the air volume decreases.

Next, when the air volume decreases, the equipment resistance decreases, and conversely, the air volume increases. Vibratory combustion continues due to such repetition.

Therefore, the pressure in the combustion chamber is detected by a pressure sensor, and when the pressure in the combustion chamber rises and the operating point moves from a to b, the controller increases the rotation speed of the blower and sets the blower characteristics to the broken line. Since the air volume is controlled to be the same as a with C, the oscillatory combustion can be suppressed without any increase or decrease in the air volume.

Embodiment An embodiment of a water heater according to the present invention will be explained with reference to FIG. In FIG. 1, 1 is a blower, 2 is an air supply chamber, 3 is a nozzle, 4 is a burner, 5 is a combustion chamber, 6 is a heat exchanger, 7 is an exhaust stack, 8 is a pressure sensor, and 9 is a controller.

Air is supplied from a blower 1 to a research supply chamber 2, fuel is supplied from a nozzle 3 to a burner 4, and is combusted in a combustion chamber 5.
It is exhausted from the exhaust pipe 7 via the heat exchanger 6. A pressure sensor 8 disposed on the outer wall of the combustion chamber 5 detects the pressure in the combustion chamber and transmits it to a controller 9.
The number of rotations of the blower 1 is increased or decreased in proportion to the increase or decrease in pressure to control the air volume.

In the water heater of this example, even if pressure fluctuations occur within the combustion chamber, the air volume does not fluctuate, and the pressure fluctuations due to the combustion reaction do not resonate with the natural frequency of the combustion device. Vibration combustion can be suppressed.

Effect of the invention With the above-described configuration, the present invention has the following effects.

(1) A pressure sensor detects the pressure increase/decrease in the combustion chamber, and the rotation speed of the blower is increased/decreased in proportion to the pressure increase/decrease, so there is no fluctuation in air volume and oscillatory combustion can be suppressed.

(2) Even if the pressure inside the combustion chamber increases due to strong winds or exhaust clogging, the air volume does not change, so combustion defects will not occur.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a water heater using a combustion device according to an embodiment of the present invention, Fig. 2 is a characteristic diagram showing the resistance and blower characteristics of the combustion device, and Fig. 3 is a water heater of a conventional example. FIG. 1...Blower, 2...Air supply type, 4
...Burner, 5...Combustion chamber, 8...
...Pressure sensor, 9...Controller. Name of agent: Patent attorney Toshio Nakao and 1 other person12
Figure 0 Resistance Figure 3

Claims (1)

[Claims] A blower that supplies combustion air, an air supply chamber downstream of this blower, a burner built into this air supply chamber, a combustion chamber located downstream of this burner, and an outer wall of this combustion chamber. A combustion device consisting of a pressure sensor and a controller that controls a blower to increase or decrease the rotation speed in proportion to the increase or decrease in combustion chamber pressure detected by the pressure sensor.