JPH0243984B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot water storage tank for heating hot water using a heat pump device or the like, storing the heated water in a hot water storage tank, and tapping the hot water when necessary.

Structure of conventional example and its problems A conventional hot water storage tank of this type is shown in Fig. 1, JP-A-58-
As shown in No. 123041, a hot water tap 2 with a large number of small holes facing downward is provided in the middle of the hot water storage tank 1, and the hot water is drawn from the bottom of the hot water storage tank 1 through the heat exchanger 4 of the heat source section 3 and from the hot water tap 2. With a configuration that allows heated water to flow out,
The flow rate of the circulation pump 5 is controlled, and when high-temperature hot water is required quickly, the flow rate is reduced and the upper part is heated using a draft, and when a large amount of hot water is required, the flow rate is increased to mix and heat the entire body. That's what I was doing.
However, in such a method, the upper part is in the state of water and is heated from the middle, and the cold water in the upper part and the heated high-temperature water in the middle part mix, so the temperature of the entire upper part rises to a high temperature as shown in Figure 2. Even though I aimed to get hot water quickly, I did not get sufficient results.

OBJECTS OF THE INVENTION The present invention solves these conventional problems.

Structure of the Invention A vertical hot water storage tank is virtually divided into two parts: a constant heating area and a heating area during bathing, and a temperature sensor is provided near the boundary between the constant heating area and the heating area during bathing, and the temperature is detected when the hot water storage tank is heated. When the detected temperature is higher than a predetermined temperature, the heated water is allowed to flow in through the intermediate inflow pipe, and when the detected temperature is lower than the predetermined temperature, the heated water is allowed to flow in through the top inflow pipe.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2. In FIG. 1, reference numeral 1 denotes a hot water storage tank, and a distributor 2' is provided in the middle of the hot water storage tank 1. 3' is a heat source device such as a heat pump,
4' is a water heat exchanger heated by the heat source device 3'. Reference numeral 5' is a circulation pump which has a variable capacity function. 6 is a three-way flow path switching valve;
The hot water storage tank 1 is branched into a top inflow pipe 7 and an intermediate inflow pipe 8.
The heating circuit 10 includes the circulation pump 5' and the water heat exchanger 4'. Reference numeral 9 denotes a temperature detector which, in conjunction with the circulation pump 5', controls the heating temperature at the outlet of the water heat exchanger 4'. Further, the heating circuit 10 shares a part of the tapping pipe 11.
Reference numeral 12 denotes a temperature detector provided near the boundary between the constant heating area A and the bathing heating area B, and is electrically connected to the three-way flow path switching valve 6. 13 is a water pipe. Note that the same members as in FIG. 1 are given the same numbers.

In the above configuration, when the entire hot water storage tank 1 is in a partially heated state, the temperature detector 12 detects a low temperature and switches the three-way flow path switching valve 6 to the top inflow pipe 7 side to exchange water heat in the lower part of the hot water storage tank 1. The hot water is heated to a predetermined temperature in a vessel 4' and then introduced from the top of the hot water storage tank 1 to constantly replace water in the heating area A with high temperature hot water. For small-scale hot water supply, the temperature sensor 12 constantly monitors the temperature of area A, and controls the entire area A to a predetermined temperature by injecting heated water from the top. Next, when the temperature sensor 12 detects a predetermined temperature or higher during bath heating, it is determined that area A is filled with high-temperature hot water, and the flow path switching valve 6 is switched to the intermediate inflow pipe 8 side. Heated water flows into the heating area B during bathing from the tributator 2' and replaces the water. If the temperature sensor 12 detects a temperature below a predetermined temperature, first let the heated water flow in from the top, and after confirming with the temperature sensor 12 that the area A has reached the predetermined high temperature, the flow path switching valve 6 is turned into an intermediate inlet. Switch to the tube 8 side and heat area B in the same way. Here, if it is necessary to reheat the bath in winter or the like, it is also possible to heat the area A at a high temperature and the area B at a medium temperature lower than the area A.

FIG. 4 shows the effect of rapidly drawing high-temperature water in the constant heating region in one embodiment of the present invention. As is clear from the comparison with the temperature rise characteristics of the conventional example shown in FIG. 2, the effect of rapidly drawing high-temperature water is improved. This is because in the present invention, there is no mixing of high-temperature hot water and low-temperature water, and the high-temperature hot water undergoes temperature stratification and replaces water.

Effects of the Invention As described above, the hot water storage tank for hot water supply of the present invention provides the following effects.

The hot water storage tank is virtually divided into a constant heating area and a heating area during bathing, a temperature sensor is installed near the boundary between the two areas, and the three-way flow switching valve is switched depending on the detected temperature, allowing heated water to flow in from the top or the middle area. Due to this structure, water and high-temperature hot water do not mix, so the constant heating area rises quickly and high-temperature hot water can be obtained in a short time. It is possible to set the temperature of the constant heating area and the heating area during bathing to different temperatures. There is less heat loss as there is no more heating than necessary.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the configuration of a conventional hot water storage tank.
Fig. 2 is a rise characteristic diagram of the hot water storage tank shown in Fig. 1, Fig. 3 is a configuration diagram of a hot water supply tank showing an embodiment of the present invention, Fig. 4 a is a rise characteristic diagram of the same, and Fig. 4 b is a similar formula diagram. It is. 1...Hot water tank, 2'...Distributor,
3'... Heat source device, 4'... Water heat exchanger, 6... Three-way switching valve, 7... Top inflow pipe, 8... Intermediate inflow pipe, 12... Temperature detector.

Claims (1)

[Scope of Claims] 1. The vertically long hot water storage tank main body is virtually divided into two parts: a constant heating area and a heating area during bathing, and a temperature sensor is provided near the boundary between the constant heating area and the heating area during bathing, and the hot water storage tank is When heating the main body, if the temperature detected by this temperature sensor is higher than a predetermined temperature, the heated water flows in from the intermediate inflow pipe, and if the temperature is lower than the predetermined temperature, the flow path is switched so that it flows in from the top inflow pipe. Hot water tank. 2. The hot water storage tank for hot water supply according to claim 1, which heats the water in the heating area for bathing at a temperature different from the temperature in the constant heating area during heating during bathing, and stores the water at two temperatures.