JPS58115245A - Water heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a hot water boiler.

In conventional hot water boilers, the temperature of the hot water in the high-temperature section was detected and controlled using a thermostat, which resulted in a high frequency of thermostat failures. The present invention aims to overcome the drawbacks of the prior art.

An embodiment of the present invention will be described below based on the drawings.

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2. In Fig. 1, inside the cylindrical outer shell 1, there are combustion gas passages connected to the exhaust device 5 in the cylindrical inner shell 2, the smoke pipe 3, and the air collection chamber 4. The smoke pipe 3 of the inner barrel 2
A burner 6 is attached to the opening on the opposite side as a heat source. The gap between the combustion gas passage and the outer shell 1 serves as a hot water chamber, and water returned from the hot air fan by the pump is returned from the return pipe 7 on the burner 6 side to this hot water chamber. The air flows again from pipe 8 to the hot air fan. Further, a hot water temperature control thermostat 10 is attached as an example of a temperature sensor to the surface of the outer shell 1 near the return pipe 7 via a thermostat fitting 9.

In a hot water boiler with the above configuration, during normal operation, circulating water that is lower in temperature than the hot water inside the boiler enters through the return pipe 7, so the thermostat is installed in the above part compared to other parts. It can be kept at low temperature.

Therefore, even if the OFF temperature setting value of the hot water temperature control thermostat 9 is set low, the temperature in the circulating water outlet pipe 8 can be maintained at a high temperature.

Furthermore, if the circulating water starts to stop while the hot water boiler is operating, the temperature at the position of the hot water temperature control thermostat 9 will approximate the highest temperature point inside the hot water chamber due to natural convection within the hot water chamber, so the OFF temperature will be set at this point. If a hot water temperature control thermometer 9 with a low set value is installed, the temperature inside the hot water chamber can be reliably detected before it boils, and the combustion of the burner 6 can be stopped to prevent boiling.

As described above, this embodiment has a simple configuration in which the circulating water temperature control thermostat 9 is attached near the circulating water return pipe 7, and has the effect of lowering the detected temperature and shortening the detection delay time of the thermostat. There is.

Furthermore, since the hot water temperature detection thermometer 9 is provided in the low temperature section, there is an effect that the frequency of failures thereof is reduced.

In addition, apart from the above embodiment, as shown in FIG. Effects can be obtained.

Moreover, as shown in FIG. 3, an even greater effect can be obtained by applying a step to the outer shell 1 to enlarge the contact area with the hot water temperature control thermostat 9.

Note that 11 in FIG. 1 is a water supply port, and 12 is a drain port.

In addition to detecting the hot water temperature in order to prevent boiling as described above, the hot water temperature control thermometer 9 also detects the hot water temperature in order to keep the hot water temperature in the hot water chamber constant.

In other words, the signal from this hot water temperature control thermostat 9 is

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a hot water boiler according to one embodiment of the present invention, FIG. 2 is a cross-sectional view showing another embodiment, and FIG. 3 is an enlarged sectional view of main parts showing still another embodiment. be. 1... Outer body (can body), 2... Inner barrel (can, body), 3... Smoke pipe, 4... Lid, 6
...Exhaust device, 6...Burner (heat source)
, 7...Return pipe, 8...Going pipe, 9.
...Thermal mounting is with metal fittings, 10...Temperature control thermo hot water detector. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3?

Claims (2)

[Claims] (1) A can body, a heat source that heats the liquid in the can body, an outgoing pipe that supplies the heated liquid in the can body to a load, and a return pipe that returns the heated liquid from the load to the can body; A hot water boiler with a temperature sensor attached to the can body near the pipe. (2) The hot water boiler according to claim 1, wherein the temperature sensor is used for both liquid temperature control and boiling prevention.