JPS638380B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote control device for remotely controlling a water heater main body from a remote control box side.

For multi-functional water heaters such as instantaneous water heaters with bath kettles, it is desirable to have the ability to remotely control the main body of the device, in which the burner and control valve are installed, from a remote location. In addition to the normal startup operation, conventional remote control devices also control the heating function of the bathtub (bath), pouring hot water into the bathtub (hot water pouring), and supplying hot water to showers, etc. (hot water supply). A rotary switch installed on the box side selects the signal line corresponding to each function, and the signal given to the main body side through this signal line operates the relay that executes each function. It is designed to use cables with 8 cores or less. However, in recent years, there has been a strong demand for systems that are multifunctional and easy to use, and remote cables with eight cores or less are becoming insufficient.

This invention was made in view of the above circumstances, and even if there are many functions that require remote control, the desired remote control can basically be performed using only two signal lines. The purpose is to provide a remote control device for water heaters that is inexpensive and highly reliable.

Next, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, A indicates the main unit of the instant water heater with a bath kettle, and B indicates a remote control box for remotely controlling the main unit A. Remote control box B is provided with a function selection rotary switch SW, and by selecting one of its contacts, the operation of relays 1K, 2K, and 3K on the main device A side can be selected. Here, relay 1
It is assumed that K performs the bath function, 2K performs the hot water supply function, and 3K performs the hot water pouring function.

Each contact S1, S2 of rotary switch SW,
S3 includes a resistor R connected between both ends of the DC power supply.
The series circuit consisting of 1, R2, R3, and R4 generates mutually different DC voltages, in this example 4V, 2V, 1
V is applied to each. The voltage signal selected by the rotary switch SW is transmitted to the main device A side through the signal line SL, and is commonly supplied to one input terminal of each of the three comparators U1, U2, and U3. Each comparator U1,
U2 and U3 are signal voltages supplied through the signal line SL with respect to the reference voltages (4V, 2V, 1V in this example) extracted from a series circuit of resistors R5 to R8 connected across the DC power supply. When the signal voltage is higher than the reference voltage (including when they are equal), an H level output is output. Now, if rotary switch SW selects contact S3, comparator U1,
A voltage signal of 1V is transmitted to U2 and U3, and only the output of comparator U3 becomes H level. Similarly, when contact S2 is selected, comparator U3
When the output of U2 and U2 becomes H level and contact S1 is selected, comparators U3, U2 and U1
The output becomes H level.

When the output of comparator U3 becomes H level,
Upon receiving this output, transistor Q3 is turned on, and relay 1K, which controls the bath function, is operated.
Further, when the output of the comparator U2 becomes H level, the transistor Q4 is turned on in response to this output, and the relay 2K that controls the hot water supply function is operated. Note that while the output of comparator U2 is at H level, transistor Q1 is turned on in response to this output and lowers the base potential of transistor Q3, so even though the output of comparator U3 is at H level, transistor Q3 is It is turned off and relay 1K does not operate. Further, when the output of the comparator U1 becomes H level, the transistor Q5 is turned on in response to the output, and the pouring function control relay 3K is operated. At this time, in response to the H level output of the comparator U1, the transistor Q
2 is turned on and the output of comparator U2 is at H level, transistor Q4 is turned off and relay 2K is not operated. Further, since the output of comparator U2 is at H level, transistor Q1 is turned on, Q3 is turned off, and relay 1K also does not operate. In other words, by selecting one of the contacts S1, S2, and S3 of the rotary switch SW, one of the relays 1K, 2K, and 3K can be selectively operated, and this operation can be performed by selecting one of the contacts S1, S2, and S3 of the rotary switch SW. This can be done reliably by transmitting the desired voltage signal through the main signal line SL.

Figure 2 shows a configuration in which, in addition to the three types of signals transmitted in the example of Figure 1, another signal independent of these can be transmitted simultaneously. The parts corresponding to those shown in FIG. In the example of FIG. 2, the predetermined frequency (for example,
A multivibrator MV that generates a pulse signal (200 Hz) is provided, and the output signal of the transistor Q6 driven by this pulse signal is supplied to the connection point between the resistors R1 and R2.
Therefore, when contact S4 is off, the signal taken out from rotary switch SW is a DC voltage signal corresponding to the selected contact, but when contact S4 is turned on, a pulse signal is superimposed on this DC voltage signal. be done. In other words, when the contact S4 is on, the signal transmitted from the rotary switch SW to the main device A side through the signal line SL has a peak value obtained by superimposing a pulse signal on the DC voltage selected by the contact of the rotary switch SW. It is a pulse signal with a constant frequency.

Now, contact S4 is on and the rotary switch
Consider a state where SW contact S3 is selected.
In this state, as in the case of FIG. 1, only the output of comparator U3 becomes H level, but since the signal input to comparator U3 is a pulse signal, its output signal also becomes a pulse signal. This pulse signal is applied to resistor R11 and capacitor C
The pulse component is cut by passing through a filter circuit consisting of 3, and the DC output turns on transistor Q3. A similar operation can be performed using a rotary switch.
When SW contact S2 or S1 is selected, the same operation is performed by comparator U2, resistor R10 and capacitor C2 or comparator U1, resistor R9 and capacitor C1, and transistor Q4 or Q5 is turned on. Note that at the same time that transistor Q4 becomes conductive, transistor Q7 becomes conductive.
conducts, so even if the comparator U3 is outputting a pulse signal, the transistor Q3 is prevented from conducting.Similarly, at the same time as the transistor Q5 becomes conductive, the transistor Q8 becomes conductive, and the transistor Q4 is prevented from conducting.

On the other hand, the pulse signal transmitted from the signal line SL is
The signal is input to the comparator U4 through a DC cut filter having a known configuration consisting of a transistor Q9, resistors R12 and R13, diodes D1 and D2, and a capacitor C4, and if the level is higher than the reference level set by resistors R14 and R15, the comparator The output of U4 becomes H level.
As a result, transistor Q10 becomes conductive, relay 4K operates, and a predetermined operating mode provided to relay 4K is selected. Furthermore, by changing the oscillation frequency of the multivibrator MV using a control signal for selecting a set hot water tap temperature, operations such as selecting a different set hot water tap temperature can be performed.

As described above, according to the present invention, a voltage signal having a different voltage depending on the function to be selected is used as a remote control signal transmitted from the remote control box side to the main device side, and the main device side adjusts each voltage. Since the function is identified according to the
Basically, it becomes possible to transmit various types of signals using two signal lines, and significant effects can be obtained in terms of reliability and cost.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a remote control device for an instantaneous water heater with a bath kettle according to an embodiment of the present invention, and FIG.
The figure is a circuit diagram showing another embodiment. A...Main device, B...Remote control box, SW...Rotary switch, SL...
Signal line, U1, U2, U3, U4...Comparator, 1K, 2K, 3K, 4K...Relay, MV...
...Multi-vibrator.

Claims (1)

[Claims] 1 A rotary switch in which different DC voltages are applied to each contact by a series circuit consisting of a plurality of resistors connected between both ends of a DC power supply, and voltage signals of different levels are applied to one input terminal by this rotary switch. The comparator supplied to A hot water bath comprising a semiconductor switch means that selects the above-mentioned comparator that outputs a voltage signal of an upper level among the outputs, and operates in accordance with the comparator, and a relay that operates based on the semiconductor switch means and controls the function. Remote control device in boiler.