JPS63105359A - Hot water supplier - Google Patents

Abstract

PURPOSE:To prevent water from being left flowing due to troubles relative to water supply or power supply and hot water supply incapability, draining deterioration and stoppage of power during supplying or draining water by providing means to detect a current flowing to heating means, and means to detect that a draining electrically driven valve moves to an open position. CONSTITUTION:When an operating switch 18 is manipulated, a contact 19-1 falls, a relay is excited, a draining electrically driven valve 38 is closed and a contact 38-1 is closed and a relay 22 is excited. Then, a contact 22-1 is closed and a water supplying electrically driven valve 37 is opened and the water supply to a hot water supplier 1 is started. Simultaneously, a timer 24 is started, a timing contact 24 is closed to excite a relay 25 and to close a contact 25-1. Upon this occasion, power is supplied from an AC power source, and power supply to heaters 43 and 44 is started and a normally closed contact 26-1 of a current detection circuit 26 is opened. However, in a case where a predetermined heater current does not flow, a normally closed contact 26-1 is not opened but a timer D27 starts, and after the lapse of a predetermined time, a contact 16-1 is closed to light an alarm lamp 17.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a water heater.

Conventional technology A conventional water heater consists of an air vent valve installed at the upper hot water supply port, solenoid valves installed at the water supply port and drain port, and a control device that controls the solenoid valves. Open the solenoid valve at the water inlet and close the solenoid valve at the drain at the same time.
A timer that is set in advance to fill the water heater tank starts energizing the heating device of the water heater after a delay, and when draining water, after stopping energizing the heating device of the water heater, the water inlet is turned off. By closing the solenoid valve and simultaneously opening the solenoid valve at the drain port, the hot water in the tank of the water heater is controlled to be discharged.

However, with this configuration, due to the structure of the solenoid valve, sudden opening and closing operations are performed during water supply and drainage operations, so if water supply pressure above a certain level is applied to the water supply side, the water heater will be damaged due to the so-called water hammer phenomenon. Also, there is a risk of damaging the water supply parts, and due to the structure of the solenoid valve, it is necessary to continue energizing the solenoid coil in order to open the valve. Because of the noise generation, heat generation caused by continuous energization for a long period of time, and problems with coil life, it is recommended to use a motor to open and close the above-mentioned solenoid valve for water supply and drainage, and to energize the motor only while the valve is opening and closing. It is conceivable that the solenoid valve or electric valve at the water inlet opens when the water supply operation is performed, and at the same time the solenoid valve or electric valve at the drain outlet closes. Water starts being supplied to the water heater tank,
A timer is set in advance for the time when the water heater's tank is filled with water, and a energization signal to the water heater's heating device is output after a delay. Generally, water heaters are equipped with a dry-heating prevention device that prevents the heating device from starting energizing unless the water level in the tank is above a certain point. The operation of the heating device is started in response to the release signal of the dry cooking prevention device.

Drainage operation 1. In this case, first, the energizing signal to the heating device stops, then the water supply solenoid valve or electric valve closes, and at the same time the draining solenoid valve or electric valve opens, draining the hot water in the tank. There is.

However, according to this configuration, when the water supply operation is performed, it is ensured that the tank is filled with water, that the operation of the dry boiling prevention device is canceled and that the heating device is energized, and that other factors such as power outage, breaker operation, etc. This is a fatal problem when using a water heater with a slow heating speed, as it cannot be determined whether the power supply to the heating device has been stopped or not, and as a result, hot water does not come out from the hot water inlet. In addition, when the water heater is not in use, the water is drained, but if there is some kind of malfunction in the electric drain valve and the water is not drained properly, there are problems such as corrosion of water that has stagnated for a long time. In addition, in systems where the water supply and drainage valves are electrically operated valves, it takes a certain amount of time to open and close the motorized water supply and drainage valves when water is supplied or drained. There was a problem in that both the water heaters were left half-open, allowing water to flow freely through the water heater tank.

Problems to be Solved by the Invention In such conventional water heaters, it is not possible to notify that the water heater is unable to operate due to a malfunction in the water supply/drain valve or a malfunction in the power supply system, although the water supply operation is performed in anticipation of a series of operations up to the operation of the water heater. . Furthermore, because the water heater has been out of service for a long period of time, malfunction of the electric drain valve cannot be detected during the drain operation performed for the purpose of draining water from the tank.

Furthermore, in a system configured with an electric valve, water is left to flow in the event of a power outage during water supply/drainage, which has the above three problems.

The present invention has been made in view of these points, and is intended to solve the above problems with a simple configuration.

Means for Solving the Problems In order to solve the above problems, the present invention provides means for detecting the current flowing to the heating means and means for detecting that the electric drain valve has moved to the open position. The electrically operated valves for water and drainage are configured to operate at staggered times.

Effect of the Invention With the above-described configuration, the present invention detects and notifies a failure related to water supply or power supply within a predetermined time during water supply operation, prevents a situation in which hot water cannot be supplied, and also prevents a situation in which hot water cannot be supplied due to malfunction of the electric drain valve during drain operation. It detects and alerts you to poor drainage, and prevents deterioration of the tank life due to accumulated water when the water heater is not in use.

By staggering the operation of the electric water supply and drainage valves during water supply and drainage, it is possible to prevent water from flowing out due to a power outage during water supply and drainage.

Example An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the water supply and drainage system for a water heater according to the present invention. In Fig. 1, 1 is a tank, an empty boiling prevention device,
A water heater consisting of a heating means, etc., 2 a hot water inlet disposed at the top of the water heater 1, 3 a water inlet disposed at the bottom of the water heater 1, 4 a drain outlet similarly disposed, 6 is an air vent valve provided to release the air discharged from the hot water supply port 2 into the atmosphere and to suck in air from the atmosphere when there is negative pressure in the room, 6゜7 is the same safety valve, and 8 is a water supply port. 9 is a pressure reducing check valve; 10 is a stop valve; 11 is a drain electric valve arranged to open and close hot water flowing out from the drain; 12 is a stop valve, 13
is the control device. In the following explanation, the switch valve 1o
and 12 are open, and the pressure reducing check valve 9 is regulated to a predetermined pressure.

FIG. 2 shows a circuit in one embodiment of the control device 13 of FIG. In FIG. 2, the reversing relay circuit 19 performs a reversing operation every time the operation switch 18 is operated, and the contact 19-1 changes to (
, )→(b)-(a). When the operation switch 18 is operated now, the contact 19-1 falls to (b), and the relay 2o is energized, which closes the contact 2o-1 connected to the closing terminal (C) of the electric drain valve 38. Closing the electric drain valve 38 When the electric drain valve 38 closes, the contact 38-1 built into the electric valve closes and the relay 22 is energized, which opens the opening terminal (0) of the electric water supply valve 37. The contact 22-1 connected to is closed, the electric water supply valve 37 is opened, and water supply to the water heater 1 is started. At this time, the air in the tank of the water heater 1 is removed from the air vent valve 6.
Water is drained more smoothly and water is supplied more smoothly.

The contact 38-1 built into the electric valve 38 is connected in parallel with the relay 20, and serves as a time contact for a timer that is preset for a necessary and sufficient time until the electric valve 38 starts energizing and closes. However, it has the same effect.

At the same time as the relay 22 is energized, the timer A24 starts. Timer A24 is the water heater 1. After starting water supply to the tank, a timer is set for a necessary and sufficient time until the tank is filled with water, and the time contact 24-1 closes to excite the relay 25.

The timer A24 is a timer for waiting until the tank is filled with water, and is a means for detecting the fullness of the tank of the water heater 1, such as a water level detection device near the upper hot water supply port 2 of the water heater 1. and its output contact as a time contact 24-
It is also possible to replace it with 1. The contact 25-1 is closed by the excitation of the relay 26, and at this time, power is supplied from the AC power source 4o, and if the operation of the dry detection device installed in the water heater 1 is deactivated, the power is supplied to the heaters 43 and 44, which are heating devices. energization is started, heating of the water in the tank is started, a predetermined heater current flows, and an induced voltage is generated in the sensor coil 28 of the current detection circuit 26 disposed in the energized path. Normally closed contact 2e-1 opens and timer D
27 will not start. If the predetermined heater current does not flow due to a power failure in the AC power supply 4o, the dry heating prevention device 41 is activated, the protector 42 is activated, or the heater 43 or 44 is disconnected, the current detection circuit 26's normally closed contact 26-1 does not open, the timer D27 starts, and after a predetermined period of time, the timer contact 27-1 closes, energizing the set coil (S) of the keep relay 16, and contact 1
e-1 is closed and the alarm lamp 17 is lit.

Note that the alarm lamp 17 may be a sound alarm means such as a buzzer.

This alarm lamp 17 is turned off by removing the reason why the predetermined heater current does not flow, and then pressing the reset switch 16 to excite the reset coil (R) of the keep relay 16 and open the contact 16-1.

Next, when the operation switch 18 is operated again, the contact 19-1 falls to the a side due to the action of the reversing relay circuit 19, and the relay 2
5 is de-energized, contact 26-1 is opened, and heater 4
3 and 44 are stopped. At the same time timer B29
starts. The timer B29 stops energizing the heaters 43 and 44, which are the heating means of the water heater 1, and naturally cools the temperature of the hot water in the tank before starting the draining operation, in order to prevent damage to the drainage equipment due to high-temperature water draining. This is a timer set up.

Therefore, the timer B29 can be replaced by temperature detection means that can close the contacts when the temperature inside the tank decreases.

The timer B29 is a predetermined timer, and the timer contact 29 is activated after the set time has elapsed.
-1 closes, energizes the relay 3o, and the contact 30-1 connected to the closing terminal (c) of the electric water supply valve 37 closes.
The electric water supply valve 37 is closed.

Timer 031 starts at the same time as relay 3o is energized. The timer 031 is preset to a time necessary and sufficient for the electric water supply valve 37 to close, and after that time has elapsed, the time contact 31-1 closes.

Note that the timer 031 can be replaced by other means for confirming the closure of the electric water supply valve 37, such as a switch that is incorporated into the electric water supply valve 37 and has a contact that closes when the electric water supply valve 37 is closed.

When the timer 310 time contact 31-1 is closed, the relay 32 is energized, and the opening terminal (0
) is closed and the electric drain valve 38 is closed.
to open.

When the electric drain valve 38 opens, the hot water in the tank of the water heater 1 is drained by gravity from the drain port 4, but at this time it is subjected to atmospheric pressure from the air vent valve 5 and can be drained smoothly.

Simultaneously with the excitation of the relay 32, the timer E33 starts. The timer E33 is preset to a time necessary and sufficient for the electric drain valve 38 to open, and closes the contact 33-1 after a predetermined period of time has elapsed. The normally closed contact 34 is a switch that is built into the electric drain valve 38 and opens when it detects its opening. In other words, if the electric drain valve 38 does not operate to the open position after the timer E33 elapses due to breakage of the sweater coil or foreign matter caught in the valve, the relay 36 is energized and the relay contact 35-1 is activated. When it is closed, the set coil (S) of the keep relay 16 is energized, and the contact 16-1 is closed and the alarm lamp 17 is turned on. This alarm lamp 17 is turned off by pressing the reset switch 15 after removing the cause of the malfunction of the electric drain valve 38.

The normally closed contact 34 may be replaced by a switch built into the electric drain valve 38, or by a contact placed at the drain of the water heater 1 and opened and held depending on the flow rate of the discharged water. It is.

Effects of the Invention As described above, according to the present invention, by using a simple control device configuration, it is possible to prevent hot water supply from being impossible due to failure of the water supply/drainage valve or failure of the power supply system when water supply is performed in the water heater. It detects and alerts you in time, and also detects and alerts you to a drainage failure due to malfunction of the electric drain valve when draining, and prevents tank life from deteriorating due to stagnant water when the water heater is not in use. Furthermore, in the event of a power outage while the electric water supply and drainage valve is in operation, it has the effect of preventing water from flowing out due to the half-open state of the water supply and drainage valve.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a water heater which is an embodiment of the present invention, Fig. 2
3 is a flowchart for explaining the same operation, FIG. 4 is a circuit diagram of a conventional water heater, and FIG. 5 is a flowchart for explaining the same operation. 1... Water heater, 2... Hot water inlet, 3...
...Water inlet, 4...Drain port, 6...
・Air vent valve, 8...Solenoid valve for water supply, 11...
...Drainage solenoid valve, 14...DC power supply, 2
7... Timer D128... Center coil. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
1, 1, 1, 2, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 1, 2, 3, 1, 1, 2, 3, 1, 2, 3, 1, 1, 2, 3, 1, 1, 2, 3, 1, 1, 2, 3, 1, 1, 2, 3, 1, 1, 3, 1/1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 5, 1, 5, 1, 5, 1, 1, 1, 1, 2, 3, 3, 1, 1, 5, 1/2 Shiri E Fig. 1 Fig. 3 63--Ichiro production switch 55-/, 55-2---Relay 5S resistance, 6-Foo relay

Claims (1)

[Claims] Equipped with a tank that has a hot water inlet at the top and a water inlet and a drain at the bottom, and a heating device to heat the water in the tank, with electric valves for the water inlet and drain, and an air release valve for the hot water inlet. and a current detection circuit and a sensor coil for detecting energization to the heating device, and when water is supplied, the water supply valve opens after the drain valve closes, and further, after a predetermined period of time, a command to energize the heating device is issued. When draining water, first stop the energization command to the heating device, close the water supply valve after a predetermined period of time, open the drain valve after a further delay, and then stop the energization command to the heating device after a predetermined period of time. A water heater equipped with a control device configured to issue an alarm if there is no energization signal from a sensor.