JPS58217152A - Hot-water supplying device - Google Patents

Abstract

PURPOSE:To enable to make the tempeature of supplying hot-water higher by a method wherein a heat exchanger is provided at the outlet port side of a heat source machine and a valve, switching the direction of flow of circulating water in accordance with the temperature of the circulating water, is provided to permit to utilize both of instantaneous heating and accumulating heating as a heat source. CONSTITUTION:The heat exchanger 6, effecting heat exchange between the circulating water heated by the heat source machine 1, is provided in a heat accumulating tank 3 while the heat exchanger 13, effecting the heat exchange between the circulating water and a fluid flowing out of the heat accumulating tank 3 through a hot-water supplying pipe 5, is provided at the outlet port side of the heat source machine 1. Further, the valve 14 for switching the flow path of the circulating water for the heat exchanger 6 in the heat accumulating tank 3 in accordance with the temperature of a temperature detecting unit 15 provided at the inlet port of the circulating water of the heat exchanger 13, and the pump 2 for circulating the circulating water, are provided. According to this method, the utilization of the heat source may be effected by both of the instantaneous heating and the heat accumulating heating and thereby enabling the supplying of hot-water with the maximum temperature obtainable in the hot-water supplying device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water heater for the residential equipment field. In particular, when using a heat storage tank in a water heater, depending on its capacity,
The hot water temperature is greatly affected.

Here, the purpose of the water heater is to supply hot water at a high temperature.

A conventional water heater will be described below with reference to the drawings.

An example of this type of device is shown in FIG.

In FIG. 1, the device has a heat exchanger inside the heat storage tank, heats circulating water, and heats the heat storage tank by natural circulation via the heat exchanger. 1 is a heat source device, 2 is a circulation pump, 3 is a heat storage tank, 4 is a water supply pipe, 6 is a hot water supply pipe, 6 is a heat exchanger, and 7, 8.9 are the positions of temperature sensors. Next, its operation will be explained. Circulating water heated by a heat source device 1 is sent to a heat exchanger 6 by a circulation pump 2, and heat is transferred to a heat storage tank 3. In the natural convection type heat transfer, water heated by the heat exchanger 6 rises upward due to the difference in specific gravity, and mixes with the surroundings at this time.

Therefore, the temperature distribution inside the heat storage tank 3 uniformly increases above the heat exchanger 6. Figure 2 shows the temperature change inside the heat storage tank when the heat storage tank is heated after hot water is supplied. From the time when hot water starts being supplied, the temperature A at temperature sensor position 9 begins to drop, then the temperature port at 8 begins to drop, and finally the temperature C at 7 starts to drop. Hot water supply ends at the hot water supply end time B, and due to the heating by the wheat exchanger 6, first only the temperature A rises, and from when it becomes the same as the temperature port, it continues to rise at the same temperature. Only when they become the same temperature does the temperature Ha begin to rise.

In such a configuration, since the entire heat storage tank is heated, the temperature of the entire heat storage tank rises, and it takes time for the temperature of the upper part of the heat storage tank to rise. It has the disadvantage that a large amount of hot water is used to fill up the bath, and then hot water cannot be used within a short period of time.

In view of the above-mentioned drawbacks, the present invention provides a water heater that can utilize hot water at a high temperature even if the temperature inside the heat storage tank has decreased.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows a water heater according to an embodiment of the present invention. Note that elements common to those in FIG. 1 are given the same numbers and their explanations are omitted. A heat exchanger 13 is provided between the heat source device 1 and the heat storage tank 3. 14 is a three-way valve. Reference numeral 2 denotes a circulation pump, which circulates circulating water between the heat source device 1, the heat exchanger 13, and the heat storage tank 3. Reference numeral 16 denotes a temperature sensing section, which is provided at the inlet of the heat exchanger 13 and controls the three-way valve 14 to switch whether or not to send circulating water to the heat exchanger 6.

Next, its operation will be explained. First, the circulating water heated by the heat source device 1 passes through the temperature sensing section 15 and enters the heat exchanger 13. At this time, when there is no hot water supplied from the hot water supply pipe 5, there is no heat exchange in the heat exchanger 13, so the temperature of the circulating water does not decrease, and the circulating water is sent to the heat exchanger 6 to heat the fluid in the heat storage tank. Circulating water whose temperature has been lowered by heat exchange in the heat exchanger 6 in the heat storage tank 3 is conveyed to the heat source device 1 by the circulation pump 2 and reheated by the heat source device 1. On the other hand, if there is hot water supply, the hot water supply pipe 5
If the temperature of the hot water passing through the hot water supply is high, the amount of heat exchanged by the heat exchanger 13 will be small, while if the temperature of the hot water supply is low, the amount of heat exchanged will be large according to the temperature difference. If the hot water supply flow rate is reduced, the maximum hot water supply temperature can be brought close to the same temperature as the circulating water temperature from the heat source device 1, and therefore hot water at a high temperature can always be obtained. During heat exchange in the heat exchanger 13, if the temperature at the temperature sensing part 16 becomes lower than the circulating water inlet temperature required by the heat exchanger 13, the flow path is switched by the three-way valve 14, and the heat source device 1 The amount of heating caused by this is used only for the heat exchanger 13.

As described above, the present invention is characterized in that a heat exchanger is provided on the outlet side of the heat source device, and a valve is provided to switch the flow direction of the circulating water depending on the temperature of the circulating water.Thereby, the heat source can be used for instant heating or heat storage. Both heating is possible. For this reason, always
It is possible to supply hot water at the highest temperature that can be obtained as a water heater.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a conventional water heater, Fig. 2 is a diagram of temperature changes in the heat storage tank when hot water is supplied and heated in the conventional water heater, and Fig. 3 is a diagram of a water heater according to an embodiment of the present invention. FIG. 1...Heat source machine, 2...Pump, 3...
... Heat storage tank, 4... Water supply pipe, 5-... Hot water supply pipe, 6... Heat exchanger, 13-- Heat exchanger, 1
4... Three-way valve, 15. River... Sensing part. N-sanno

Claims (1)

[Claims] A heat source device, a heat storage tank having a heat exchanger therein for exchanging heat with circulating water heated by the heat source device, and an outlet of the heat source device for exchanging heat between the circulating water and fluid flowing out from the heat storage tank. a heat exchanger provided on the side, a temperature sensing section provided at the circulating water inlet of the heat exchanger, and a flow path of the circulating water to the heat exchanger in the heat storage tank being switched according to the temperature of the temperature sensing section. A water heater equipped with a valve for water and a pump for circulating water.