JPS62125256A - Hot water supplier - Google Patents

Abstract

PURPOSE:To make it possible to constantly obtain supply hot water of a predetermined temperature simultaneously when a cock is opened and to prevent after heating by providing a return path for returning hot water from upstream side of the cock to an inlet part of a heat exchanger and returning hot water or water within a pipeline back to a heat exchanger by means of a pump provided in the return path. CONSTITUTION:Hot water within a heat exchanger 1 is supplied through a cock 8 via a pipeline 7. However, when the cock 8 is closed, hot water within the pipeline 7 and the heat exchanger 1 passes through a pipeline 9 by the operation of a pump 10, and is circulated from a heat exchanger 1 to the pipeline via the inlet part of the heat exchanger 1 by means of the pump 10. When the temperature of hot water during the circulation becomes lower than a predetermined temperature, a signal from a thermistor 6 which has detected that enters a control unit 11, a burner 1 is ignited and heats the circulating hot water so that hot water is controlled to constantly assumes a predetermined temperature. Since the circulation of hot water is constantly conducted even when the cock is closed, hot water within the pipeline 7 is not cooled but simultaneously when the cock 8 is opened, hot water of a predetermined temperature is supplied.

Description

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

2. Description of the Related Art In general, a water heater is heated by a burner 2 while water flows through a heat exchanger 1, as shown in FIG. Then, the heated hot water passes through the thermistor 3, passes through the piping 4, and comes out from the faucet 5. A gas proportional valve 6 is provided to adjust the amount of gas supplied to the burner 2 so that the heated water reaches a constant temperature when it passes through the thermistor 3, and 7 is a water flow switch that ignites the gas when water flows. It is for stopping the combustion of gas when the flow of water is stopped or when the flow of water is stopped.

Problems to be Solved by the Invention However, in such a water heater, when the hot water in the pipe 4 becomes cold, when the faucet 5 is opened to dispense hot water, the cold water in the pipe 4 is turned off first. There is a problem that hot water comes out after that, and furthermore, once the faucet 5 is turned off, the water stops flowing.

When the gas stops, it stops heating the heat exchanger 1, but all the heat that the heat exchanger 1 was receiving when the water stopped is absorbed by the water that is still inside the heat exchanger 1, causing the hot water to heat up more than necessary. be done. In this state, if you open the faucet 5 that was closed earlier again without waiting too long, after the hot water in the pipe 4 comes out, hot water heated by 7IO more than necessary in the heat exchanger will come out. (After boiling) There was also a problem.

Means for Solving All Problems The hot water supply gg of the present invention connects the return pipe from before the faucet to the inlet of the heat exchanger so that the hot water in the pipe does not cool even when the faucet is not open, and also connects the return pipe to the inlet of the heat exchanger. The water is returned using a pump installed in the tank, and when the returned hot water is lower than the set water temperature, a burner is burned to heat it up and the water flows back to the faucet.In this way, even when the faucet is closed, the hot water remains at a constant temperature. Maintain the inside of the piping so that

Function: The water heater of the present invention is provided with piping for the return path of the above-mentioned means, and returns hot water or water in the piping to the heat exchanger using a pump in the return path;
Even if the faucet is closed, the gas burner is controlled 1flJ to keep the hot water at a constant temperature, and since the inside of the pipes are not cooled, cold water does not come out. In addition, even when the faucet is closed, the hot water continues to flow through the pump, so the hot water is not heated more than necessary, eliminating problems such as after-boiling, which occurs when the hot water in the heat exchanger stops heating. It is.

Embodiment Hereinafter, a water heater according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, when water flows through the heat exchanger gg1, the water flow switch 2 is operated and gas flows from the gas block 3 to the burner 4. This flowing gas is ignited by the spark from the ignition plug 5. The combustion of this gas heats the water in the heat exchanger. The temperature of the 710 heated water is measured by a thermistor 6, and controlled by a gas proportional valve (not shown) in the gas block 3 so that the 7xJ heated water has a constant temperature. Hot water passes through a self-contained pipe 7 and comes out from a faucet 8. Also, when the faucet 8 is closed, the pump 10
With this operation, the hot water in the piping 7 and the heat exchanger 1 is circulated through the piping 9 and the inlet of the heat exchanger 1 from the heat exchanger 1 to the piping 7 by the pump 10. When the hot water falls below a certain temperature during circulation, a signal from the thermistor 6 that detects this goes into the control device 11, and the signal from this device ignites the burner 1 to heat the circulating hot water and keep it at a constant temperature. control so that Circulation should be continued even when the faucet is closed. These controls are performed by the control device 11.

Therefore, since the hot water in the pipe 7 does not cool down, hot water at a predetermined temperature comes out as soon as the faucet 8 is opened. moreover,
When the faucet 8 is closed, as usual, the flow of hot water in the heat exchanger g1 stops and all of the heat in the heat exchanger gm is transferred to the hot water where the flow has stopped, causing the water temperature to become higher than necessary. No more boiling (after-boiling is eliminated).

Effects of the Invention As described above, the water heater of the present invention is provided with a return path that pumps hot water back to the inlet of the heat exchanger in front of the faucet, so that even if the faucet is closed, the heat exchange S = ~ piping ~Return~ Since the water circuit at the inlet of the heat exchanger constantly circulates the hot water to maintain a constant temperature, a predetermined amount of hot water is always available as soon as the faucet is opened. Also, even if you close the faucet and use it again immediately, the hot water is constantly circulating, so is it possible to exchange heat like in the past? This eliminates the possibility that the flow of hot water in g has stopped and all the heat in the heat exchanger has been transferred to the hot water where the flow has stopped, causing the temperature of the hot water to become higher than necessary (post-boiling).
No more worries about burns, etc.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention. FIG. 21 is a block diagram of a conventional example. 1... Heat exchanger, 2... Water flow switch, 3... Gas block, 4... Burner, 6... Thermistor. 7...Plumbing, 8...Faucet, 9...
...Return trip, 1o...Turn/Pump, 11...Control device.

Claims (1)

[Claims] a burner, a heat exchanger heated by the burner, a thermistor installed at the outlet of the heat exchanger to detect the temperature of the hot water;
A gas block is connected to a gas block that controls the amount of gas supplied to the burner to reach a set water temperature according to resistance changes caused by changes in hot water temperature of this thermistor, a faucet that turns hot water on and off, and this faucet and a heat exchanger. a return path that connects the pipe in front of the faucet to the inlet of the heat exchanger, a pump that flows hot water from the faucet side toward the inlet of the heat exchanger in the middle of this return path, and the gas block, pump, etc. A water heater consisting of a control device.