JPS62155434A - Proportional control type gas combustion device - Google Patents

Abstract

PURPOSE:To prevent mutual interference to occur when regulating a secondary pressure of gas and to regulate the same simply by a method wherein the title combustion device is provided with a means for setting the maximum and minimum voltages corresponding to a secondary pressure, and another means for operating an output voltage from set maximum and minimum voltages. CONSTITUTION:Voltages, corresponding to a regulated maximum secondary pressure and minimum secondary pressure, are stored in a gas amount operator 1 while the gas amount operator 1 operates based on the voltages corresponding to the regulated maximum secondary pressure and minimum secondary pressure and outputs a voltage signal corresponding to the necessary amount of gas from a voltage signal outputting terminal 3. The regulation of the maximum secondary pressure is effected by a method wherein a switch 6 for setting the maximum secondary pressure is turned on to output the voltage signal of the maximum secondary pressure from a voltage signal outputting terminal 3 and a maximum secondary pressure regulating resistor 8 is operated to regulate the maximum secondary pressure outputted from the signal outputting terminal 3. The regulation of the minimum secondary pressure may also be effected by the turning-on of a minimum secondary pressure setting switch 7 and the operation of a minimum secondary pressure regulating resistor 9 in the same manner.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a proportional control type gas combustion device using a gas proportional valve in which secondary gas pressure is controlled according to a coil current value.

(Prior art and problems) Conventionally, in this type of proportional control type gas combustion device, the minimum gas secondary pressure adjustment is required to adjust the gas secondary pressure as shown in Fig. 4, as disclosed in Japanese Utility Model Application Publication No. 58-5B248. The resistor (2) for adjusting the maximum secondary gas pressure is connected to the output terminal of the comparison circuit where the resistor (1) for adjusting the maximum gas secondary pressure is connected to the positive phase input terminal. In order to adjust the secondary pressure, it is necessary to repeatedly adjust these resistances, and there is a problem that adjustment is troublesome and time-consuming.(Objective of the Invention) The present invention aims to solve these problems. It is a thing,
A detailed explanation will be given below based on an example of a diagram.

(Example) In Fig. 1, (1) calculates the required gas amount based on signals from a temperature setting device and a temperature detector (both not shown), and generates a predetermined voltage signal corresponding to the required gas amount. This is a gas amount calculator (1) that outputs gas [i], and a microcomputer is used for this gas amount calculator (1). (2) is an amplifier connected to the voltage signal output terminal (3) from which the voltage signal is output, and (4) is a voltage - connected to the output side of the amplifier (2).
In the current conversion circuit, a coil (5) of a gas proportional valve (not shown) is connected to the output side of the conversion circuit (4).

(6) is a switch for maximum secondary pressure setting, and (7) is a switch for minimum secondary pressure setting. When these switches are turned on, the maximum secondary pressure and minimum secondary pressure are output from the voltage signal output terminal (3). A voltage signal of pressure is output. (8), (9Nf) The maximum secondary pressure and minimum secondary pressure output from the voltage signal output terminal (3) when the maximum pressure setting switch (6) and minimum secondary pressure setting switch (7) are turned on, respectively. The maximum secondary pressure adjustment resistance and the minimum secondary pressure adjustment resistance adjust the voltage of the gas.The adjusted maximum secondary pressure and minimum secondary pressure voltages are stored in the gas amount calculator (1), The amount calculation M (1) performs the calculation described below based on the adjusted maximum secondary pressure and minimum secondary pressure voltages, and outputs a voltage signal corresponding to the required gas amount from the voltage signal output terminal (3). .

In the above configuration, the maximum secondary pressure can be adjusted by turning on the maximum secondary pressure installation switch (6) and connecting the voltage signal output terminal (3).
output the voltage signal of the maximum secondary pressure from the terminal (3) by operating the maximum secondary pressure adjustment resistor (8).
Adjust the voltage of the maximum secondary voltage output from 11. The minimum secondary pressure can also be adjusted in the same way by turning on the minimum secondary pressure setting switch (7) and operating the minimum secondary pressure adjusting resistor (9).

Gas amount calculation! The relationship between the output voltage V and the gas secondary pressure P2 in (1) is shown in Figure 2, which shows the relationship between the gas secondary pressure P2 and the coil current value dU, and Figure 2, which shows the relationship between the coil current value Idu and the output voltage V. From Figure 3, P 2- Ka X V +K b
...-(1) Also, the relationship between gas secondary pressure P2 and gas IO is P2. - a X G"-1-b ・--(2)
(1) −(From 2, V−AXG2+B ・ −・ (3) Also, the relationship between the output voltage Vmax of the maximum secondary pressure and the gas amount G max at that time is vmax=l−AxGmax×B ・ ・ ・4)
However, the relationship between the output voltage V min of the minimum secondary pressure and the gas amount G win at that time is V m1n = AX G m1n2-1- B -...
(5) holds true.

When obtaining an arbitrary gas ff1G, from N (4) - (5), A - (V max - V min ) / (Gm
ax2-Gm1n) B-(GmaxXVmin-GminXVmax/(G
maxz−G m1n2), and from equation (3), V −(VmaxX(G−Gmax )+Vmin (
a min”-02) :) / (G max2-
a m1n2) is obtained. The gas amount calculator (1) calculates the output voltage V by substituting the required gas amount according to the deviation between the set temperature and the detected temperature into any G in this equation, and outputs this voltage signal. . It is.

(Effects of the Invention) As described above, the present invention has a circuit configuration in which the minimum secondary pressure regulating resistance and the maximum secondary pressure regulating resistance do not interfere with each other, so that mutual interference does not occur when adjusting the gas secondary pressure. Easy to adjust

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram showing an embodiment of the present invention, FIG.
FIG. 3 is an explanatory diagram showing the relationship between the gas secondary pressure, the coil current value, the fill current value, and the output voltage on the same side, and FIG. 4 is an electric circuit diagram showing a conventional example. (1)...Gas amount calculator (4)...Voltage-current conversion circuit (5)...For coil patents/LMjin Co., Ltd. Noritz Representative Toshibe Ota

Claims (1)

[Claims] A gas amount calculator using a microcomputer that outputs a predetermined voltage signal according to the required gas amount based on the signals from the temperature setting device and the temperature detector, and a voltage-current conversion circuit connected to the voltage signal output terminal. , and a gas proportional valve that controls the gas supply amount according to the current value flowing through the coil, the gas amount calculator sets the maximum and minimum voltages corresponding to the maximum and minimum secondary pressures, respectively. 1. A proportional control type gas combustion apparatus, comprising means for calculating the output voltage based on set maximum and minimum voltages.