JPH0128298B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a forced combustion heating machine.

FIG. 1 shows a conventional heating-only machine. During heating operation, water is circulated through piping 2 by a pump 1, and heat is exchanged into hot water by a heat exchanger 3. The temperature of the hot water that has passed through the heat exchanger 3 is determined by the thermostat 4.
detected and controlled by By the way, combustion gas is sent from the gas inlet to the main burner 5 that heats the heat exchanger 3 via the first electromagnetic valve 6 → gas governor 7 → second electromagnetic valve 8, and is combusted in the main burner 5. The heat exchanger 3 is heated by combustion in the main burner 5, and the heat of the heat exchanger 3 is exchanged with hot water. Exhaust gas from the main burner 5 is discharged to the outside of the machine from an exhaust port 9. 10 is a supplementary water tank, 11
is a radiator provided in the pipe 2. In such a conventional heating-only machine, thermostat 4
Since the second solenoid valve 8 is opened and closed by detecting the hot water temperature, when the heating load is high, the second solenoid valve 8 is fully opened and the amount of combustion gas is large, and when the heating load is low, the second solenoid valve 8 repeats opening and closing. The amount of combustion gas is small. Therefore, when the heating load is high, high thermal efficiency is obtained as shown in FIG. 2, but when the heating load is low, the thermal efficiency is low due to excess air.

Therefore, it is an object of the present invention to obtain high thermal efficiency over the entire heating load range and to be able to measure energy savings. Figure 4)
The explanation will be based on. In the figure, 21 is a pump provided for circulating circulating water in the piping 22;
3 is a heat exchanger for exchanging heat from circulating water flowing through the pipe 22 to hot water; 24 is a thermostat for controlling the temperature of the hot water in the pipe 22; 25 is a main burner that heats the heat exchanger 23, and combustion gas is supplied to the main burner 25 from the gas inlet.
The gas flows through the solenoid valve 26 and the gas governor 27 and the second solenoid valve 2
8 and the third solenoid valve 29, and can be burned in the main burner 25. Exhaust gas generated by the main burner 25 is discharged to the outside of the machine from an exhaust port 34 by a combustion fan 30. Reference numeral 31 denotes a radiator provided in the pipe 22, and a plurality of radiators 31 are actually provided in parallel or in series. 32 is a makeup water tank. 35 is a hot water bypass circuit in the equipment, and the bypass flow rate is varied by piping resistance according to the number of radiators, and when the number of radiators is small, the flow rate is large, and when the number of radiators is large, the flow rate is small.
By the way, the present invention utilizes the fact that when the heating load is large during heating operation, the number of radiators 31 used increases, so the bypass circuit 35 has a small flow rate, and the heating hot water flow rate of the hot water pipe 22a has a large flow rate. A flow rate sensor 33 is provided in the flow sensor 22, and the combustion fan 30 is switched and rotated by a signal current from the flow rate sensor 33, and the second solenoid valve 28 and the third solenoid valve 29 are fully opened to adjust the amount of gas and the amount of combustion air. By appropriately mixing the two, a moderately high thermal efficiency can be obtained when the heating output is large. When the heating load is small, that is, when the number of radiators 31 used is small, the bypass circuit 35 has a large flow rate, and the hot water pipe 22a has a small flow rate, and the flow rate sensor 33 detects that the hot water flow rate has fallen below a predetermined hot water flow rate and adjusts the set current. The combustion fan 30 is switched to make a small rotation, and the second solenoid valve 28 and the third solenoid valve 29 are
By turning off either one of them and appropriately mixing the amount of gas and the amount of combustion air, high thermal efficiency can be obtained even when the heating load is small.
In this way, the signal current of the flow rate sensor 33, the rotation of the combustion fan 30, and the first and second electromagnetic valves 28,
By matching the opening degree of 29 to 1:1, high thermal efficiency can be obtained over the entire heating load range, and energy saving can be achieved. Figure 4 shows a graph of the relationship between heating output and thermal efficiency according to the present invention, and compared to the graph of the conventional example shown in Figure 2, the thermal efficiency is significantly increased when the heating load is small, and when the heating load is large. However, an increase in thermal efficiency was observed. In the present invention, the predetermined flow rate point of the flow rate sensor 33 is the point at which the heating load is switched.

The forced-combustion heating-dedicated device of the present invention can be implemented as described above, and the combustion section can be adjusted in response to changes in the heating load caused by increases or decreases in the number of radiators installed in different rooms. This can be done in a timely manner, high thermal efficiency can be obtained even when the heating load is small, high thermal efficiency can be obtained over the entire heating load range, and energy can be saved.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing a conventional example, FIG. 2 is a graph showing the relationship between heating output and thermal efficiency according to the conventional example, FIG. 3 is a vertical cross-sectional view showing an example of implementation of the present invention, and FIG. It is a graph showing the relationship between heating output and thermal efficiency according to the present invention. 21...Pump, 22...Piping, 23...Heat exchanger,
24...Thermostat, 25...Main burner, 2
6...First solenoid valve, 27...Gas governor, 28...Second
Solenoid valve, 29...Third solenoid valve, 30...Combustion fan, 31...Radiator, 33...Flow rate sensor, 34...
Exhaust port, 35...bypass circuit.

Claims (1)

[Claims] 1. A flow rate sensor for detecting the flow rate is provided in a hot water circulation channel formed by interposing a plurality of radiators installed in different rooms in parallel, and a flow rate sensor is installed to detect the flow rate according to the degree of hot water flow rate. A forced combustion system characterized by being provided with a combustion fan whose rotation speed can be changed, and gas control means for adjusting the gas flow rate to the gas combustion section that heats the circulating water flowing through the circulation flow path using a signal from a flow rate sensor. A dedicated combustion type heating machine.