JPH02176352A - Hot water feeder - Google Patents

Abstract

PURPOSE:To enable the feed of sanitary hot water through the feed of water after washing of the interior of a hot water storage tank by a method wherein the title hot water feeder is provided with a motoroperated water teed valve, a motor-operated drainage valve, and a motor-operated valve control device, and control is effected so that the motor-operated water feed valve and the motor-operated drainage valve are brought into an opening state for a specified time during the starting of the feed of water. CONSTITUTION:With a water teed switch turned ON, a motor-operated drainage valve 7 is opened and a motor-operated water feed valve 6 is then opened. The two valves 6 and 7 maintain an opening state until the given number of seconds is counted. Water in a pipe is drained and old water is drained as fresh water is fed, and the interior of a hot water storage tank 1 is washed. After, with the motor-operated water teed valve 6 closed, water used for washing is drained until the given number of minutes is counted, the motor-operated drainage valve 7 is closed and a washing motion is completed. Subsequently, the motoroperated water feed valve 6 is opened to start a water feed motion, and at a point of time when the tank becomes full of water, the feed of water is automatically stopped. Continuously, control of energization of a heat generating substance 2 is effected by means of a heat generating substance control device 9 in the same manner as an ordinary electric hot water feeder.

Description

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

BACKGROUND OF THE INVENTION A conventional hot water storage type water heater will be explained with reference to the schematic diagram of FIG. 4.

In FIG. 4, 1 is a hot water storage tank, and a heating element 2 is attached to the lower part of the tank. 3 is a valve that restricts hot water extraction, 4 is a water supply valve that restricts water supply, and 5 is a drain valve that restricts drainage.

Next, the operation will be explained.

During normal use, the water supply valve 4 is set to "open" and the drain valve 5 is set to "open".
When it is set to "closed", the heating element 2 is controlled to boil water when the water is full, and hot water can be used from the boiler 3.

However, when you are away for a long time, the hot water or water in the hot water storage tank 1 becomes unsanitary, so the water supply valve 4 is closed, the drain valve 5 is opened, and the hot water or water is drained from the hot water storage tank. 1
Make the inside empty.

Problem to be Solved by the Invention Even if you intend to empty the hot water storage tank 1 as described above when you are away from home for a long period of time, due to the structure of the hot water storage tank 1, a small amount of water may remain and the water between the water supply valve 4 and the hot water storage tank l may There is water remaining in the pipe. "Close" the drain valve 5 for next use.
Since the water supply valve 4 is then opened and water supply is started, there is a problem in that unsanitary water, scum, rust, etc. are mixed in. There are many opportunities for this, especially in resort condominiums.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to supply water after cleaning the inside of a hot water storage tank, thereby supplying sanitary hot water.

Means for Solving the Problems The water heater of the present invention includes an electric water supply valve, an electric drain valve, and an electric valve control device, and opens both the electric drain valve and the electric water supply valve for a certain period of time when water supply starts. It is intended to be controlled.

Function: The water heater of the present invention automatically drains the water in the water supply pipe when water supply starts, cleans the tank for a certain period of time, and then supplies water.

Example Hereinafter, a water heater according to an embodiment of the present invention will be described.

FIG. 1 is an overall configuration diagram of a water heater according to an embodiment of the present invention, and numerals 1, 2, and 3 are completely the same as the conventional example of the water heater. 6 is an electric water supply valve that limits water supply; 7
is an electric drain valve that limits drainage. 8 is an electric valve control device, and 9 is a heating element control device.

FIG. 2 is a circuit diagram showing the electrical connection of the water heater according to the embodiment shown in FIG. 1. In FIG. , 11 is a microcomputer in the control device, and input circuit 11
-1. Memory 11-2. CPUll-3, output circuit 11
-4. 12 is an electric valve control circuit, which includes a resistor,
Driver 1 consisting of a transistor (none of which is shown)
2-1.12-2. Water supply relay 12-3. Drainage relay 1
It consists of 2-4. The motor M1 of the electric water supply valve 6 is activated by the contact 12-3-1 of the water supply relay 12-3.
is driven, and the "open" switch 6-1 or the "close" switch 6-2 is turned off using a lever attached to the motor shaft. Similarly, the motor M2 of the electric drain valve 7 is driven by the contact 12-4-1 of the drain relay 12-4, and the "open" switch 7-1 or the "close" switch 7-2 is driven by a lever attached to the motor shaft. Turn off. 14 is a commercial power source for driving the motors M1 and M2. 13 is a heating element control circuit, which includes a driver 13-1 and a relay 13.
-2.

The electric valve control device 8 is composed of a drainage operation circuit 10, a microcomputer 11, and an electric valve control circuit 12.
The heating element control device 9 includes a temperature detector (not shown), a microcomputer 11, and a heating element control circuit 13.

Next, the operation of the above embodiment will be explained with reference to FIG. FIG. 3 shows the memory 11-2 of the microcomputer 11.
3 is a flowchart showing control of the electric water supply valve 6 and the electric drain valve 7 stored in FIG. Water supply is started when the hot water storage tank 1 is empty.

That is, when the water supply switch l0-1 is turned on, the electric drain valve 7 in step 15 shown in FIG. 3 is opened.

Next, the electric water supply valve 6 in step 16 is opened, and both electric water valves 6 are opened until 30 seconds in step 17 are counted.
, 7 remain open, the water in the pipe is drained, new water enters, and old water is drained, and hot water storage tank 1
The inside is cleaned. In step 18, the electric water supply valve 6 is “closed”
After the water used for washing is drained until 3 minutes are counted in step 19, the electric drain valve 7 is closed in step 20, and the washing operation is completed.
1, the electric water supply valve 6 is "open" and water supply operation begins, and the water supply is automatically stopped when the water is full. onwards,
A heating element control device 9 controls energization of the heating element 2 in the same way as in a normal electric water heater.

In this embodiment, the cleaning time was 30 seconds and the cleaning water draining time was 3 minutes, but these values may be set to appropriate values depending on the capacity of the hot water storage tank 1, water pressure, etc.

In addition, when the electric drain valve 5 in step 15 is “open” and step 16
The "open" position of the electric water supply valve 4 may be reversed.

Furthermore, it goes without saying that the electric valve 4.5 may be replaced with a solenoid valve.

Effects of the Invention As described above, according to the present invention, when water supply starts, the electric water supply valve and the electric drain valve are automatically opened to clean the inside of the tank, and then water is supplied, which is particularly hygienic. This is particularly effective when used in resort condominiums, where people are often absent for long periods of time.

[Brief explanation of the drawing]

FIG. 1 is a schematic overall configuration diagram showing a water heater according to an embodiment of the present invention, FIG. 2 is a main electrical circuit diagram of the water heater according to the embodiment, and FIG.
The figure is a flowchart showing the operation of the water heater of the same embodiment, and FIG. 4 is a schematic configuration diagram of the conventional water heater. 1...Hot water storage tank, 6...Electric water supply valve, 7...Electric drain valve, 8...Electric valve control device. Name of agent: Patent attorney Shigetaka Awano (1 person)

Claims (2)

[Claims] (1) comprising an electric water supply valve that limits water supply to a hot water storage tank, an electric drain valve that limits drainage from the hot water storage tank, and an electric valve control device that controls the electric water supply valve and the electric drain valve; A water heater that controls both the electric drain valve and the electric water supply valve to be "open" for a certain period of time when water supply starts. (2) After opening both the electric drain valve and the electric water supply valve, first close the electric water supply valve, and after the water in the hot water tank is almost empty, turn the electric drain valve on. The water heater according to claim 1, wherein the water heater is controlled to be closed.