JPH0635896B2 - Water heater - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply device that allows hot water to be used in other places at the same time while pouring hot water into a bathtub or the like.

Conventional technology A hot water passage of a water heater is branched and one of them is connected to a bathtub to supply hot water of an appropriate temperature, or hot water is supplied to the water heater to add a bath function. There is a water heater. With such a water heater, hot water (for example, about 75 ° C)
Supply hot water) mode, and then open another tap, hot water staying on the outlet side (shaded area in Fig. 1) will come out of the open tap, so It was necessary to release hot water.

Problems to be Solved by the Invention In such a device operation, when the other hot water tap is opened immediately after hot water is discharged, hot water comes out, and the use of hot water is temporarily interrupted and discharged. , There was a risk of burns and it was extremely inconvenient.

The present invention solves the above problems, and an object of the present invention is to provide a hot water supply device that can stop combustion and discharge hot water into a bathtub or the like after use of hot water is finished. is there.

Means for Solving the Problems The hot water supply device of the present invention for solving the above problems is a water detecting device for detecting the amount of water, a hot water temperature detecting device for detecting the hot water temperature, and a bathtub provided by branching the hot water passage. An operation determination means and operation for determining an operation state based on a signal of a water amount variable device having a water stop function provided in a pipe and a signal of an operation mode setting unit provided in an operation unit, a signal of a water detection device, and a signal of a hot water temperature detection device According to the signal of the judging means, after the hot water is finished, the supply of heat energy to the heat exchanger is stopped and the water amount changeable device is fully opened, after which a certain amount of hot water has flowed or the temperature has dropped below a certain temperature. And a control device having a hot water discharge processing operation for closing the post-water amount varying device.

Action With the above configuration, when the corresponding hot water switch in the operation mode setting unit in the control device is turned off in order to finish the use of the hot water, the control device receives the heat energy to the heat exchanger by the signal. Is stopped and the water amount varying device is fully opened, and the hot water in the heat exchanger and the water passage is discharged into the bathtub through the water amount varying device. During this time,
The amount of hot water to be discharged is determined by the water detector installed on the inlet side of the heat exchanger detecting the predetermined amount of water newly supplied into the heat exchanger, or the temperature of the hot water provided on the outlet side of the heat exchanger. The determination is made by detecting that the signal of the detector has changed from the high temperature state to the constant temperature state. When it is determined that a certain amount of hot water has been discharged, the water amount varying device is closed and this hot water passage is closed to prevent hot water from flowing to the other taps.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 1 is a block diagram of an embodiment of the present invention, in which 1 is a water inlet, 2
Is a water detecting device, 3 is a constant water quantity governor, and 4 is a heat exchanger, which converts water into hot water by heat energy supplied from the gas burner 5. Reference numeral 6 denotes a hot water temperature detecting device provided in the water passage on the outlet side of the heat exchanger 4. 7 is a gas inlet, 8 is a solenoid valve, 9 is a gas proportional valve, and 10 is a flame detector provided near the flame port of the burner 5.
Reference numeral 11 denotes a control device, which includes an operating portion 12, determines the operating state by the ON-OFF state of the operation mode switch of the operating portion 12, the water detection device 2, the hot water temperature detection device 6, and the signal of the flame detector 10,
It controls the solenoid valve 8, the gas proportional valve 9, the exhaust fan 13 provided above the heat exchanger 4, and the water amount variable device 14 provided in the middle of one of the bathtub pipes 34 of the hot water passage and having a water stop function. 33
Is connected to the bathtub pipe 34 by a bathtub. This bathtub piping 34
At the time of normal automatic pouring, hot water of appropriate temperature passes, and when hot water is hot, hot water passes. Reference numeral 35 is a general hot water supply pipe. The operation unit 12 has an operation switch 15 as an operation mode switch, an automatic pouring switch 16 and a high temperature hot water switch 17 for setting an operation mode.

Next, FIG. 2 shows a microcomputer provided in the controller 11.
23 is a flowchart of the hot water discharge processing operation of 23, and the operation will be described with reference to this flowchart. In Step 18, the operation section
Turn on the operation switch 15 of 12. Then, when the high-temperature hot water switch 17 is turned on, the water amount varying device 14 is opened and the water flows. When the water amount detector 2 detects the flow of water, the solenoid valve 8 and the gas proportional valve 9 are opened by the control device 11 to ignite the burner 5. In step 19, the control device 11 controls the hot water temperature and the water amount by the signals from the hot water temperature detecting device 6 and the water detecting device 2, and also monitors whether the high temperature hot water switch 17 is turned off. In step 20, when the high-temperature hot water switch 17 is turned off, the control device 11 causes the burner 5 to be extinguished and the water amount varying device 14 to be fully opened. In step 21, after the burner 5 extinguishes, it is monitored whether the amount of water passing through the heat exchanger 4 has reached the set value. In step 22, when the water amount reaches the set value, the water amount varying device 14 is closed and the operation of the device is stopped.

Further, the hot water temperature detecting device 6 is used without using the signal of the water detecting device 2.
In the case of using, the water amount varying device 14 is fully opened after the burner 4 is extinguished until the signal from the hot water temperature detecting device 6 falls below a certain temperature. If the water amount varying device 14 is closed when the signal from the hot water temperature detecting device 6 falls below a certain temperature, the same effect as when measuring the water amount by the water detecting device 2 is obtained.

FIG. 3 shows a specific circuit of the main part. The control device 11 is composed of a microcomputer 23 and peripheral circuits.
The microcomputer 23 is a so-called one-chip microcomputer having a CPU, ROM, RAM and an input / output unit. The operation switch 15, the automatic hot water supply switch 16, and the high-temperature hot water switch 17 in the operation unit 12 input their output voltages to the comparator 26. The comparator 26 compares this voltage with the reference signal output from the microcomputer 23 via the D / A converter 25 and the analog switch 24, and inputs the "H" or "L" signal to the microcomputer 23. The microcomputer 23 looks at the signal output to the D / A converter 25 and the "H" or "L" signal of the comparator 26 to set the operation mode, the operation switch 15, the automatic hot water supply switch 16,
Which of the high-temperature hot water switches 17 has been operated (ON-OFF) is determined.

The signal of the water detection device 2 is input to the microcomputer 23 through the buffer 32. This signal is a pulse signal, the microcomputer 23 counts the number of pulses,
Calculate the amount of water.

The control of the water amount variable device 14 has the following configuration. The microcomputer 23 supplies the drive voltage of the motor 28 of the water amount variable device 14 to the water amount variable device controller 27 via the D / A converter 25 and the analog switch 24, and also forward / reverse rotation signals directly to the water amount variable device controller 27. give. The water amount variable device controller 27 rotates the motor 28 in response to the signal. When the motor 28 rotates, the fully open detector 29 and the fully closed detector 30 attached to the motor 28 operate, and the signals thereof are input to the microcomputer 23. Based on this signal, the microcomputer 23 determines whether the water amount varying device 14 is fully opened or fully closed, and controls the signal to the water amount varying device controller 27.

Further, the hot water temperature signal is detected as follows. The output of the hot water temperature detection device 6 is input to the comparator 31. Comparator 31 receives this signal and microcomputer 23
The A converter 25 is compared with the reference signal output via the analog SW 24, and the “H” or “L” signal is input to the microcomputer 23. Therefore, the microcomputer 23 determines the hot water temperature based on the signal output to the D / A converter 25 and the signal from the comparator 31.

With such a configuration, when the high temperature hot water switch 17 is pressed to end the high temperature hot water mode, the operation of the slap 20 shown in FIG. 2 is performed. That is, when the control device 11 extinguishes the burner 5 and fully opens the water amount varying device 14, the hot water in the hot water passage 36 (shaded portion in FIG. 1) common to the heat exchanger 4 is discharged to the bathtub 33 through the bathtub pipe 34. Let Burner 5 according to step 21
After the fire extinguishes, it is monitored whether the amount of water passing through the heat exchanger 4 has reached the set value. At this time, if the amount of water corresponding to the pipe capacity of the hot water passage 36 common to the heat exchanger 4 is set in advance, all the hot water in the hot water passage 36 common to the heat exchanger 4 is discharged to the bath 33. And a hot water passage 36 common to the heat exchanger 4
The inside is all water. Therefore, even after the faucet 37 in the conventional hot water supply pipe 35 is opened after step 22, the hot water from the faucet 33 is prevented from coming out. Similarly, when the hot water temperature detecting device 6 is used to monitor the hot water temperature instead of the set water amount, after the burner 5 extinguishes, the hot water passes through the bathtub pipe 34 and the bathtub 33.
When the water temperature of the common hot water passage reaches a safe hot water temperature, the variable water amount device 14 is closed. Also in this case, even if the faucet 37 is opened after the end of this operation, hot water does not come out of the faucet 37.

Therefore, it is possible to provide a safe water heater with a high-temperature hot water supply function.

EFFECTS OF THE INVENTION According to the present invention, after the use of high-temperature hot water is finished, a certain amount of water is made to flow and then the water is stopped. Even if is used, hot water does not come out, and it is possible to obtain a water heater that is safe to use and convenient to use.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is a flow chart showing an embodiment of the present invention, and FIG. 3 is a schematic diagram of a main circuit portion showing the embodiment of the present invention. . 2 ... Water detection device, 4 ... Heat exchanger, 5 ... Gas burner, 6 ... Hot water temperature detection device, 11 ... Control device, 12 ... Operation part, 14 ... Water amount variable device with water stop function .

Claims (1)

[Claims] 1. A water detecting device for detecting a flow or amount of water, a heat exchanger, and a hot water temperature detecting device for detecting hot water temperature at an outlet side.
A water quantity varying device having a water shutoff function provided in the middle of piping to a bathtub provided by branching the hot water passage downstream thereof, a heating element for supplying thermal energy to the heat exchanger, and an operation provided in the operation section After the end of use of the high-temperature hot water, the heat exchanger uses the signal of the mode setting unit, the signal of the water detector, and the signal of the hot water detector to determine the operating state, and the signal of the operation determiner. After stopping the supply of thermal energy to the bath, and after a certain amount of hot water has flowed or the temperature of the hot water has dropped below a certain temperature, there is a hot water discharge operation for closing the pipe to the bathtub by the water amount varying device. A water heater with a control device.