JPH0229414Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a capacity switching control circuit for remotely switching the combustion capacity of a gas combustor. Conventionally, there have been switching control devices of this type as shown in FIGS. 1 to 3. FIG. 1 is a layout diagram showing a switching control system of a gas combustor. In the figure,
An appliance controller A that controls a gas burner is usually placed outdoors, and a kitchen controller B is placed indoors, for example, in a kitchen, and a bath controller C is placed in a bathroom. FIG. 2 is a configuration diagram of a gas supply path of a gas combustor placed outdoors. In FIG. 2, 1 is a main valve, and three small valves 2, medium valves 3, and large valves 4 are arranged in parallel on the downstream side thereof, and each of them is connected to burners 5, 6, and 7. 8 is the pilot burner and 9 is the igniter. When controlling the gas combustor with the multi-valve configuration shown in Fig. 2, the appliance controller A described above is installed near the combustor, and the appliance controller A is controlled by the kitchen controller B and bath controller C, which are located remotely. However, gas valves 2, 3, and 4 at that time
The capacity switching circuit for capacity control had the configuration shown in FIG. In FIG. 3, the same symbols as in FIGS. 1 and 2,
Since the symbols are the same, their explanation will be omitted. 11 is a relay that determines the priority of kitchen controller B and bath controller C; 14 is a relay that determines the priority of kitchen controller B;
Three capacity changeover switches 15 are provided inside the bath controller C, and 15 are four capacity changeover switches installed inside the bath controller C. First, as shown in FIG.
When 5 is in the off position, power from instrument controller A energizes relay 11 via terminals 1 and 2. Therefore, the three contacts 12-1, 12
-2 and 12-3 are reversed to the kitchen controller B side as shown. Therefore, at this time, only the state of the changeover switch 14 of the kitchen controller B is responded to. That is, when the small state is instructed as shown in the figure, only the small valve 2 is energized; in the medium state, the small valve 2 and the middle valve 3 are energized; and in the large state, the small valve 2 and the middle valve 3 are energized. All of the large valves 4 have top diodes 16,
It operates by the function of 17. On the other hand, bath controller C
When the changeover switch 15 is removed from the OFF position, the relay 11 is deenergized and each contact of the relay returns to the bath controller C side, so from now on, the same capacity switching operation as the kitchen controller B can be performed on the ventilation controller C. It becomes possible. However, in order to perform such remote switching control, as shown in Figure 3, for example, to connect the kitchen and bathroom, it is necessary to use four to five or more cables just for the capacity switching operation. Therefore, there were drawbacks that were an obstacle to improving the functions of the kitchen controller. In this invention, different types of switching signals are given from the bath controller by an on-off switching signal like in the past, and different types of switching signals are given from the kitchen controller by analog signals. It is an object of the present invention to provide a capability switching control circuit that performs discrimination based on a logic circuit. Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 4 is a configuration diagram of a capacity switching control circuit according to an embodiment of the present invention. Resistor 1 for kitchen controller B
8a, 18b, and 18bc are switched by a one-channel three-circuit capability changeover switch. Terminals A and B are connected to input terminals A and B of a discrimination circuit 20 of instrument controller A. 21 and 22 are comparators, and r ₁ to _{r 4} form a bridge circuit 30 together with the resistor 18. Terminal 2 of bath controller C is connected to a switch circuit 23 consisting of resistors 24, 25 and transistors 26, 27, and it is determined whether bath controller C or kitchen controller B should be prioritized. The operation of such a configuration will be described. In this embodiment as well, priority is given to the changeover switch 15 of the bath controller C, which determines in the bathroom which of the bath controller C or the kitchen controller B is effective for switching the capacity. Now, as shown in the figure, if the off state is selected with the changeover switch 15 of the bath controller C, the terminal 1 to terminal 2
The power supply voltage V ₊ is applied to the low resistors 24 and 25 through
Transistors 26 and 27 are both turned on. As a result, the OR circuit consisting of diodes 28 and 29 works effectively, and the comparators 21 and 2
The respective output signals of 2 can be supplied to transistors 31, 32 as switch elements to drive the valves 3, 4. On the other hand, resistance 18 of kitchen controller B
If the magnitude relationship of the resistance values Ra, Rb, and Rc of a, 18b, and 18c is Ra<Rb<Rc, then the resistances 18a and 18
By switching the selection of b and 18c, the output signals of the comparators 21 and 22 as shown in the following table are sent out,
Drive valves 2, 3, 4.

[Table] In this way, it is possible to switch the capacities of three valves using only two cables from terminals A and B of kitchen controller B. In addition, in Fig. 4, diode 3
3, when the transistor 31 has an open failure and the large state is selected, there is a danger of the flame transferring to the burner 7 located far from the burner 5, so when the transistor 32 is forcibly driven, the middle valve is 3
It is also used to open the valve. Next, when the changeover switch 15 of the bath controller C is switched and removed from the OFF position, the base voltage of the transistor 26 in the switch circuit 23 is erased, and the discrimination circuit 20
Since the supply of the output signal is stopped by the off operation of the transistor 27, the output supply function of the discrimination circuit 20 is stopped. The switching between large, medium, and small combustion states by the changeover switch 15 of the bath controller C is almost the same as the conventional method, so a detailed explanation will be omitted. However, in this case, when small valve 2 enters the combustion state, one valve must start, so selector switch 1 is intentionally selected.
There is no linkage with terminal 3 of 5. FIG. 5 shows a block diagram of another embodiment of this invention. In this case, the difference from the embodiment shown in FIG. 4 is that in the case of FIG. In the embodiment shown in FIG. 5, the medium and large valves are controlled by forcibly lowering the collector voltages of the transistors 31 and 32 to ground by a switching signal from the bath controller C. The rest is almost the same as the embodiment shown in FIG.
As can be seen by comparing the embodiments shown in FIGS. 4 and 5 with the conventional example shown in FIG. Reduced to two. As described above, according to the capacity switching control circuit of the present invention, an analog signal is sent from the kitchen controller to the appliance controller, and a discrimination circuit consisting of a comparator determines the capacity switching, and a plurality of signals are sent from the bath controller to the appliance controller by wired OR. Since it is configured to control the valve, the number of cables can be significantly reduced, the changeover switch can be simplified, and it has the advantage that it can be applied as is to an existing bath controller.

[Brief explanation of the drawing]

Figure 1 is a layout diagram of a controller that controls a gas combustor, Figure 2 is a configuration diagram of a gas supply path to a gas combustor with multiple gas valves, and Figure 3 is a connection diagram of a conventional capacity switching control circuit. , FIG. 4 is a connection diagram of a capacity switching control circuit according to one embodiment of the present invention, and FIG. 5 is a connection diagram of a capacity switching control circuit according to another embodiment of the present invention. A... Appliance controller, 1... Main valve, 2...
Small valve, B...Kitchen controller, 3...Medium valve, 4
...Big valve, C...Bath controller, 5, 6, 7
...Burner, 8...Pilot burner, 14,1
5... Capacity selection switch, 20... Discrimination circuit, 2
1, 22... Comparator, 26, 27, 31,
32...transistor, 30...bridge circuit.

Claims (1)

[Scope of utility model registration request] A first controller includes a changeover switch that sequentially selects a plurality of resistors each having a different resistance value, a selection switch that selects which controller to give priority to, and a first controller that selects a plurality of valves of the gas combustor from large to medium. a second controller having a capacity changeover switch that controls switching to a three-stage combustion state, a bridge circuit that connects the resistance selected by the changeover switch of the first controller to one side; a plurality of comparators for determining combustion states of the three medium and small stages; and a switch circuit that receives a selection signal from a selection switch of the second controller and supplies an output signal of each of the comparators to a switch element connected to the plurality of valves. and an appliance controller disposed at or near the installation position of the gas combustor.