JPH0141902B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a water heater equipped with a plurality of remote controllers each having a setting means for setting the temperature of hot water supplied from the main body of the water heater.

Conventional Structure and Problems There is a conventional water heater, for example, a gas water heater having the structure shown in FIG. The water heater main body 1 includes solenoid valves 2, 3, which control the flow rate of gas input as Gi.
A proportional valve 4, a burner 5 that burns gas, a pilot burner 6, a flame detector 7, a spark plug 8, a heat exchanger 9 that exchanges heat between the water input as Wi and the combustion heat in the burner 5, and a hot water supply request. Flow switch 10 that detects the presence or absence of water, thermistor 11 that detects the temperature of hot water, flow switch 10, thermistor 1
1. A remote control device that inputs the signal from the flame detector 7 and outputs a signal that controls the solenoid valves 2, 3, the proportional valve 4, and the spark plug 8, controls the sequence of the water heater, and controls the hot water temperature as described below. The controller 12 is provided to perform temperature control to maintain the temperature at the set temperature set by the controller 12. Reference numeral 13 denotes a first remote control device, which has first setting means 14 for setting the hot water temperature. Reference numeral 15 denotes a second remote control device, which includes a second setting means 16 for setting the hot water temperature, a set temperature _TRA set by the first setting means 14, and a set temperature TRA set by the second setting means 16. It has a switch 17 for selecting the set temperature _TRB . In the figure, the selection switch 17 selects the set temperature _TRB , and the set temperature
_TRB is input to the controller 12, and the controller 12 controls the proportional valve 4 so that the outlet temperature becomes equal to the set temperature. These remote control devices are
It is set near each of the hot water supply bells 18 and 19, and when the user wants to set the temperature of the hot water from the hot water supply bell 18 to a predetermined temperature, the user operates the first setting means 14, and when using the hot water boiler 19, the user operates the first setting means 14. At the same time as operating the means 16, the selection switch 17 is set to the set temperature _TRB side. After using the switch 19, set the selection switch 17 to the set temperature _TRA side again.

In this configuration, while the first user uses the ring 18 and the hot water temperature is controlled to the set temperature T _RA , the second user uses the ring 19 and sets the selection switch 17 to the set temperature T RA. When set to _{the RB} side, the controller 12 controls the outlet temperature to the set temperature _TRB . If the set temperature T _RB is higher than the set temperature T _RA , there is a risk that the first user using the ring 18 will be burned.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks, and even when the set temperature is changed from the first setting means to the second setting means, the change is made only when safety is maintained. The purpose is to control the set temperature so that there is no risk of burns.

Configuration of the Invention In order to achieve the above object, the water heater of the present invention is configured to include a priority controller that selects the lowest set temperature from among the set temperatures from a plurality of setting means, for example, as in the conventional example. , first set temperature
When switching from _TRA to the second set temperature _TRB , the second set temperature _TRB is higher than the first set temperature.
Switches only when lower than T _RA , otherwise the first
Since the set temperature _TRA is selected, that is, the low temperature setting is prioritized, it has the effect of realizing highly safe hot water supply without the risk of burns.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, 20 is a first remote control device, which includes a variable resistor 21 as a first setting means and an LED 22 for priority display. 23 is a second remote controller, which includes a variable resistor 24 as a second setting means;
It is equipped with an LED 25 for priority display and a switch 26 for changing the set temperature. 27 is a priority controller, which is configured as follows. The set temperatures T _RA and T _RB are set using resistors 28 and 29 and variable resistors 21 and 2 as set temperature signals.
The voltage obtained by dividing the DC power supply voltage V _CC by 4 and V _RA , V _RB
Convert to 30 is a comparator which inputs the voltages V _RA and V _RB , and is Hi when V _RA > V _RB , and Hi when V _RA < V _RB.
Output Lo. 31 is a gate circuit that selects V _RA or V _RB according to the output of the comparator 30 and outputs either one, and the inverter 32 receives the output of the comparator 30 as an input, and turns on and off by the output of the inverter 32. Analog switch 33, comparator 30
It consists of an analog switch 34 that is turned on and off by the output of the switch.

The operation of the above configuration will be explained below. When the switch 26 is off, V _RB ≈V _CC , which is a high voltage, that is, the highest set temperature. At this time, since V _RA > V _CC , V _RA <
_VRB , the output of the comparator 30 becomes Lo, the analog switch 34 turns off, and the LED 25 does not light up. Since the inverter 32 output becomes Hi,
The analog switch 33 is turned on, and the gate circuit 31 is turned on.
selects and outputs V _RA . On the other hand, the output of the inverter 32 causes the LED 22 to light up, indicating on the first remote control device that it is given priority.

Next, a case will be described in which the switch 26 is turned on and the second remote control device side is given priority. If the temperature T _RB set by the variable resistor 24 of the second remote control device is higher than that of the first remote control device, _{V RA <} V _RB as described above.
Therefore, V _RA corresponding to the lower set temperature is selected. In the opposite case, that is, when T _RA > T _RB and V _RA > V _RB , the output of the comparator 30 becomes Hi and the output of the inverter 32 becomes Lo, so the analog switch 33 is turned off and the LED 22 is turned off. On the other hand, the analog switch 34 is turned on, the LED 25 lights up,
It is displayed that the remote control device 23 side is given priority and the remote control device 20 side is given non-priority, and the gate circuit 31 outputs a voltage V _RB corresponding to the temperature T _RB set by the second remote control device 23 to the controller 12.

As described above, according to this embodiment, since the priority controller is provided which selects and outputs the lowest set temperature signal from among a plurality of set temperature signals, safe hot water supply without the risk of burns can be achieved. It displays whether hot water is being supplied according to the temperature set on the remote control device, so each user can easily check visually whether or not hot water is being obtained at the temperature set by the user. For remote control devices that have a switch that can do this, if this switch is turned off, a signal equal to the maximum temperature setting is input to the priority controller, so the priority controller selects the set temperature of unnecessary remote control devices. Never,
Since the priority controller has a simple configuration and can be easily downsized, it has the advantage that it can be installed in any remote control device or water heater main body.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) Since hot water is supplied according to the lowest set temperature among multiple set temperatures, there is no risk of burns and it is safe.

(2) The priority controller can be configured with a simple circuit, it can be easily miniaturized, and the priority controller can be installed in any location.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a conventional water heater, and FIG. 2 is a diagram of a remote controller and priority controller of a water heater according to an embodiment of the present invention. 1... water heater body, 20, 23... remote control device, 21, 24... variable resistor, 27... priority controller, 30... comparator, 31... gate circuit.

Claims (1)

[Claims] 1 A water heater main body that supplies hot water at a set temperature, a plurality of remote control devices equipped with a setting means for setting the set temperature, and a plurality of set temperature signals from the setting means of the plurality of remote controllers. a priority controller that selects one of the temperature signals and outputs it to the water heater main body; the priority controller includes a comparator that compares the plurality of set temperature signals; and a comparator that compares the plurality of set temperature signals; A water heater that consists of a gate circuit that selectively outputs signals.