JPS62293043A - Instantaneous water heater - Google Patents

Abstract

PURPOSE:To make it possible to immediately supply hot water through a water tap when the water tap is closed and opened after a predetermined time by providing bypass channels on the inlet and outlet sides of a water heating heat exchanger and adjusting combustion by a second solenoid valve. CONSTITUTION:When a water tap 1 is closed, a first water flow switch 2 is turned OFF. Therefore, a first water solenoid valve 12 is turned OFF by a combustion control device 11 and, at the time, a second water solenoid valve 13 and a pump 14 provided in a bypass channel 16 are turned ON. By the turning ON of the pump 14, a second water flow switch 15 is turned ON. This signal is input to the combustion control device 11 and a second solenoid valve 17 is closed and the combustion of a burner 8 becomes a lowest ability combustion and is continued for approximately 7min. Through the bypass channel 16 including a water heating heat exchanger 4 water is circulated by means of the pump 14 and is continuously heated by the lowest combustion ability burner 8. When the water tap 1 is reopened, hot water which has been circulated through the bypass channel and warmed is immediately supplied through the water tap 1.

Description

[Detailed description of the invention] 3. Detailed description of the invention Industrial applications The present invention relates to a gas-fired adjacent water heater.

2. Prior Art A schematic diagram of a conventional adjacent water heater is shown in FIG.
is a water flow switch, 3 is a water supply channel, 4 is a water heating exchanger, 5
1 is a hot water supply path, 6 is an electromagnetic valve which is a fuel source valve, 7 is a gas passage, 8 is a burner which is a heating device, 9 is an igniter, 10 is a flame detector, and 11 is a combustion control device.

Then, by opening the faucet 1, the water flow switch 2 provided at the entrance of the water supply channel 3 is closed (hereinafter referred to as ON), and an operating signal of the appliance is input to the combustion control device 11, and the igniter 9 Start spark discharge from , open solenoid valve 6, and turn on burner 8.
gas is supplied to start combustion. The spark discharge of the igniter 9 is stopped by the output of the flame detector 10 which detects this combustion, and the combustion continues. Next, when the faucet 1 is operated to close.

The water flow switch 2 is opened (hereinafter referred to as OFF), a stop signal for the appliance is input to the combustion control device 11, and the combustion control device 11 operates to close the solenoid valve 6 and stop combustion.

Furthermore, when the faucet 1 is opened again, the water flow switch 22
was ONL, and the above operations were performed.

Problems to be Solved by the Invention However, in the conventional configuration described above, when the shower faucet 1 is closed, combustion stops, and when the shower faucet 1 is opened again, combustion starts. ,
The heat exchanger 4. This meant that the water downstream came out of the shower, making it inconvenient to use.

The present invention solves these problems.

This provides an instantaneous water heater that continues combustion for a predetermined time such as several minutes even when the faucet is closed, and when the faucet is opened again at that predetermined time, hot water immediately comes out from the faucet. .

Means for Solving the Problems In order to solve the above problems, the instantaneous water heater of the present invention includes a first water flow switch provided at the inlet of the water supply channel, a water heating exchanger connected to the water supply channel, By using the third water flow switch installed in the hot water supply path and closing the faucet that opens the hot water supply path and releases hot water,
A first water solenoid valve that is closed when the first water flow switch is closed, a second water solenoid valve that is opened at the same time, and a pump that is also started to operate;
a second water flow switch activated by operation of the pump;
Consisting of a second water solenoid valve, a pump and a second water flow switch,
A bypass waterway connected between the inlet and outlet of the water heating heat exchanger, a first solenoid valve that is a fuel source valve, and a second solenoid valve that adjusts the combustion capacity to the minimum when the bypass route is activated. and 1 igniter, a flame detector, and a signal from a first water flow switch, or a signal from a third water flow switch that is generated when the water faucet that has been closed is opened again within a predetermined time, a first water solenoid valve, The combustion control device opens the first electromagnetic valve and the second electromagnetic valve, causes ignition by one igniter, and controls combustion.

Function: According to the instantaneous water heater configured as described above, even if you are taking a shower and once the shower faucet is closed, the hot water continues to circulate in the bypass waterway, so even if you open the shower faucet again, there will be no hot water. It comes out immediately and is very easy to use.

Embodiment One embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a schematic diagram of an instantaneous water heater according to an embodiment of the present invention, and FIG. 2 is a flowchart showing its operating process. In Fig. 1, 1 is a faucet, 2 is a first water flow switch, 3 is a water supply channel, 4 is a water heating heat exchanger, 5 is a hot water supply path, and 12 is a first water solenoid valve for stopping water supply ( ), 13 is a second water solenoid valve (hereinafter referred to as WV2), 14 is a pump, 15 is a second water flow switch that is closed by the operation of the bonder 14;
16 connects both ends to the front and rear of the water-required heat exchanger 4, and connects the front v2, 13, the pump 14, and the second water flow switch 15.
Bypass waterway consisting of.

6 is a first solenoid valve (hereinafter referred to as SV1) which is the main valve of the fuel supply path, 17 is a second solenoid valve (hereinafter referred to as SV2) that adjusts the combustion capacity, and 18 is a valve for setting combustion to the lowest capacity. 8 is a burner; 9 is a bypass gas passage for supplying fuel;
is the igniter, and 10 is the flame detector.

11 is a combustion control device for controlling combustion, and 19 is a third water flow switch for detecting reuse of the faucet.

In the above configuration, when the faucet 1 is opened, the first water flow switch 2 is turned on, and the combustion control device 11 receives this signal.
As a result of the operation, spark discharge is performed from the igniter 9, the valves of SVI.6 and SV2.17 are opened, and combustion is started in the burner 8. Then, the flame detector 10 detects the burner 8.
The combustion control device 11 receives the signal after confirming the ignition of the
The spark discharge from the igniter 9 is stopped by the signal, and the water passing through the water supply channel 3 is heated by the water heating heat exchanger 4.
Hot water comes out from the faucet 1 via the hot water supply path 5. Next, when the water faucet 1 is closed, the first water flow switch 2 is turned OFF, so the combustion control device 11 that has received this No.
- At the same time that WV 12 is turned off, both WV2 and 13 provided in the bypass waterway 16 and the pump 14 are turned on. When the pump 14 is turned on, the second water flow switch 15 is turned on, and this signal is input to the combustion control device 11 and the SV2.17
is closed, and the combustion of the burner 8 becomes the lowest capacity combustion and continues for about 7 minutes. Then, the water is circulated by the pump 14 through the bypass water passage 16 including the water heating heat exchanger 4, and is continuously heated by the burner 8 having the lowest combustion capacity.

When the faucet 1 is opened again in the above state (= burning at the lowest capacity), the third water flow switch 19 turns ON, and the combustion control device 11 receives this signal, and the bypass water passage 16 (7) WV2
-13 is ○FFL, pump 14 is also OFF, WVl 12 installed in water supply channel 3 is ONI, first water flow switch 2
is ONL, and thereafter the operation is performed according to the above-mentioned operation process.

Therefore, the hot water that has been warmed by being circulated throughout the bypass channel is immediately discharged from the water a1.

Effects of the Invention As described above, according to the instantaneous water heater of the present invention, even if the faucet is opened again within a limited time, water will not come out and the water will come out immediately, making it convenient for use in showers, etc. This is advantageous in practice.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a stop-start type Komama water heater which is an application example of the present invention, and FIG. 2 is a flowchart showing its operating process. FIG. 3 is a schematic diagram of a conventional stop-start type water heater. 1... Water faucet, 2... First water flow switch, 3... Water supply channel, 4... Water heating exchanger, 5... Water supply channel. 6...First solenoid valve, 7...Gas passage, 8
...Burner, 9...Igniter, 10...
... Flame detector, 11 ... Combustion control device, 1
2...First water solenoid valve, 13...Second water solenoid valve, 14...Pump, 15 Kawayama second water flow switch, 16...Bypass waterway % 17...
Second solenoid valve, 19...Third water flow switch. Figure 1 Figure 2

Claims (1)

[Claims] Close the first water flow switch installed at the entrance of the water supply channel, the water heating exchanger connected to the water supply channel, the third water flow switch installed in the hot water supply channel, and the faucet that opened the hot water channel and supplied hot water. A first water solenoid valve that is closed when the first water flow switch is closed, a second water solenoid valve that is also opened, and a pump that is also started to operate, and are activated by the operation of the pump. a bypass waterway connected between an inlet and an outlet of the water heating heat exchanger, and a fuel main valve, which is composed of a second water flow switch, the second water solenoid valve, a pump, and a second water flow switch; a first solenoid valve, a second solenoid valve that adjusts the combustion capacity to the minimum when the bypass passage is activated, an igniter, a flame detector, and a signal from the first water flow switch or the water faucet once closed. The first water solenoid valve, with the signal of the third water flow switch issued when it opens again within a predetermined time.
An instantaneous water heater comprising a combustion control device that opens a first electromagnetic valve and a second electromagnetic valve, and controls combustion by igniting the igniter.