JPS6314199Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a forced draft combustion device, and relates to a combustion device in which the damper opening degree of the blower is adjusted so as to obtain an amount of combustion air proportional to the amount of gas combusted. .

This will be explained based on the illustrated embodiment. Reference numeral 1 denotes a forced draft combustion apparatus main body, which includes a heat exchanger 2, a burner 3, and a blower 4 for forced draft. 5 is a proportional valve provided in the gas passage leading to the burner 3; 6 is a heat-sensitive element such as a thermistor; 7 is a controller; 8 is a damper provided at the air suction port 9 of the blower 4; 10 is a servo motor for driving the damper 8; 11 is damper 8
This is a potentiometer that detects the opening degree.

Fig. 2 shows a block diagram of the controller of the present invention, and 12 is a proportional circuit to which a signal of the outlet water temperature detected by the heat-sensitive element 6 is input, and the output temperature and the set temperature are compared and the difference is increased. The width is increased, and the resulting amplified output is applied to the proportional valve 5 and the comparison circuit 13. This comparison circuit 13 compares the amplified output with the opening detection output from the potentiometer 11,
The operation of the servo drive circuit 14 is controlled so that both outputs are equal, and the operation of the servo drive circuit 14 causes the servo motor 10 to rotate in forward and reverse directions.
The rotation of the damper 8 rotates and the opening of the air suction port 9 of the blower 4 is controlled, and the rotation of the servo motor 10 causes the potentiometer 11 to follow and change the opening detection output. . 25 is a manual adjustment device for controlling the current value flowing through the potentiometer 11. Figure 3 is an exploded view of the blower, 15 is a fixing plate attached to the blower 4;
6 is a servo motor 10 and a potentiometer 1
This is a mounting plate on which a box 17 having a box 17 is mounted and fixed, and is provided with an angle adjustment groove 18 for adjusting the mounting angle with respect to the fixed plate 15. 19 is the output shaft of the servo motor 10 provided on the same axis as the variable shaft of the potentiometer 11, and is fitted to the rotation shaft 21 of the damper 8, so that the rotation output of the servo motor 10 is connected to the rotation shaft of the damper 8. 21 and the variable shaft of the potentiometer 11. 20 is a tightening screw.

Conventionally, in systems that proportionally control the amount of gas depending on the temperature, the current value flowing through the proportional valve is varied depending on the type of gas, but this method automatically adjusts the amount of combustion air according to changes in the amount of gas. In this type of forced draft combustion appliance, the problem has arisen that optimum combustion cannot be obtained because the amount of combustion air does not accurately follow changes in the amount of gas caused by changing the gas type.

On the other hand, as described in the above embodiments, the present invention is provided with a manual adjustment device 25 for controlling the current value flowing through the potentiometer 11. Therefore, by operating this adjustment device 25 when changing the gas type, It is possible to provide an amount of combustion air that matches the amount of the converted gas type.

That is, according to the present invention, when changing the gas type, an amplification output corresponding to the maximum or minimum secondary gas pressure is first given to the comparator circuit 13. At this time, the damper 8 is rotated until the opening detection output of the potentiometer 11 becomes equal to the amplification output. Next, the adjusting device 25 changes the current value flowing through the potentiometer 11 until the damper 8 position that has stopped reaches the set position at the maximum or minimum secondary gas pressure of the converted gas type, and the potentiometer 11 is opened. The operation is finished when the damper 8 reaches the set position.

As described above, according to the present invention, when changing the gas type, it is possible to easily obtain the opening degree of the damper 8 according to the gas type using the adjusting device 25, which greatly contributes to optimal combustion in this type of forced draft combustion device. This is possible.

Furthermore, in the present invention, the mounting plate 16 is provided with an angle adjustment groove 18 for adjusting the mounting angle with respect to the fixed plate 15, so that the opening degree of the damper 8 can be adjusted independently of the servo motor 10 and the potentiometer 11. If it is difficult to adjust by changing the current value, the above-mentioned adjustment operation can be made easier by using it to adjust the opening degree of the damper 8 with respect to either the maximum secondary gas pressure or the minimum secondary gas pressure. It has the advantage of being easy.

[Brief explanation of the drawing]

FIG. 1 is an overall view showing one embodiment of the present invention, FIG. 2 is a block diagram of the control circuit, and FIG. 3 is an exploded view of the blower. 5... Proportional valve, 8... Damper, 10... Servo motor, 11... Potentiometer, 12... Proportional circuit, 13... Comparison circuit, 25... Adjusting device.

Claims (1)

[Scope of utility model registration request] A proportional circuit that compares the tapped water temperature and the set temperature, amplifies the difference, and gives the amplified output to a proportional valve and a comparison circuit, and a damper opening detection output using the amplified output of the comparison circuit and a potentiometer. In a device consisting of a servo motor driven by comparison with the servo motor, and a damper whose opening degree is adjusted by the servo motor, the mounting plate to which the servo motor and the box having the potentiometer are mounted and fixed is attached to the output shaft of the servo motor. A forced draft combustion device characterized in that the mounting angle of the damper can be freely adjusted with respect to the rotational direction of the damper, and is equipped with a manual adjustment device that controls the value of the current flowing through the potentiometer.