JPH0428974B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to improving the usability of a hot water supply device in which a terminal hot water supply port is located far away from a hot water heat source device such as a central hot water supply system.

Conventional technology Central hot water supply is commonly used because it has the effect of concentrating the heat source when hot water is supplied to multiple hot water outlets. At the beginning of use, not only does the cold water in the pipes come out, but it also takes a long time for hot water at a specified temperature to come out, which is inconvenient in actual use. As a means to eliminate such inconveniences and inconveniences, for example, Fig.
15562), the main heat source unit 1 and a hot water storage tank 3 having a heating element 2 inside are connected through a hot water supply pipe 4, and the cold water that had accumulated in the hot water supply pipe 4 at the beginning of use is removed. The configuration is such that the cold water is mixed with hot water in a hot water storage tank 3 and flows out from the hot water faucet 5, so that cold water does not directly flow out from the hot water faucet 5.

Problems to be Solved by the Invention However, in the above configuration, the main heat source device 1 and the hot water storage tank 3 were directly connected through the hot water supply pipe 4, and therefore had the following drawbacks.

(1) It is necessary to arrange the hot water storage tank 3 near the hot water faucet 5, and the hot water storage tank 3 is placed in a position where it can be seen during use, which is not desirable in terms of installation space and aesthetics. .

(2) Even if the cold water in the hot water supply pipe 4 mixes in the hot water storage tank 3, the temperature in the hot water storage tank 3 must be kept from falling below the lower limit of the hot water supply operating temperature (30 to 40°C).

(3) At the beginning of use, hot water in the hot water storage tank 3 comes out, but it gradually cools down, and when hot water from the main heat source device 1 is supplied to the hot water storage tank 3, the hot water temperature rises again. It is difficult to set the water temperature to the lower limit.

The present invention solves the above-mentioned conventional problems, can be installed anywhere, and aims to supply hot water at a predetermined temperature immediately from the beginning of use.

Means for Solving the Problems In order to solve the above problems, the water heater of the present invention includes a main heat source machine and a terminal water heater having a hot water storage tank in which a heating element is installed, The hot water outlet pipe and the hot water supply inlet of the terminal water heater are communicated through a hot water supply pipe, the hot water supply outlet of the terminal water heater and the water supply pipe are communicated with a mixing faucet, and a bypass pipe is inserted into the hot water storage tank. and this bypass pipe,
A bypass pipe outflow hole for diverting the flow from the hot water supply pipe to the inner bottom of the hot water storage tank and a bypass pipe inflow hole for allowing the flow from the upper part of the hot water storage tank to flow into the bypass pipe are provided.

Effects According to the present invention, with the above-described configuration, the so-called cold dead water that has accumulated in the hot water supply piping from the vicinity of the hot water outlet pipe of the main heat source device is first supplied to the inner bottom of the hot water storage tank through the bypass pipe outflow hole. Therefore, the high-temperature hot water already heated by this dead water flows into the bypass pipe from the bypass pipe inlet at the top of the hot water storage tank, mixes with the cold water that has passed directly through the bypass pipe, and passes through the hot water supply outlet to the mixing faucet. You will be guided to the bath.

Furthermore, since the bypass pipe is provided within the hot water storage tank, there is no heat radiation from the surface of the bypass pipe.

Embodiment An embodiment of the present invention will be described below with reference to FIG. 1 of the accompanying drawings. In FIG. 1, 1 is a main heat source machine having a cold water inlet pipe 6 and a hot water outlet pipe 7 connected to water pipes, etc., and 8 is a terminal water heater, which has a heating element 2 and a bypass pipe 9 inside a hot water storage tank 3. A hot water supply inlet portion 10 and a hot water supply outlet portion 11 at the lower and upper portions of the bypass pipe 9 are attached to the hot water storage tank 3. A bypass pipe outflow hole 12 is provided below the bypass pipe 9 extending into the hot water storage tank 3, and a bypass pipe inflow hole 13 is provided above. 4 is a hot water supply pipe connecting the hot water outlet pipe 7 of the main heat source device 1 and the hot water supply inlet section 10 of the terminal water heater 8;
This is a water supply pipe that supplies water that further heats the mixed hot water from 1 to a predetermined hot water temperature using a temperature type mixing valve 15.

The hot water whose temperature has been regulated by the temperature type mixing valve 15 will be dispensed at that temperature by opening only the hot water side valve 16 of the mixing faucet 5, and then by opening the water side valve 17, the opening degree of both valves can be adjusted. Then, the hot water temperature and the hot water flow rate can be arbitrarily adjusted within the temperature range below the set temperature of the temperature type mixing valve 15.

In the above configuration, the temperature of the hot water storage tank 3 is 85°C, and the temperature of dead water in the hot water supply pipe 4 is 5°C, assuming winter. In addition, the flow path resistance from the hot water supply inlet section 10 to the hot water supply outlet section 11 through the bypass pipe 9, and the flow path resistance from the hot water supply inlet section 10 to the bypass pipe outflow hole 12, the hot water storage tank 3, and the bypass pipe inflow pipe 13, It is assumed that the flow path resistance up to the hot water supply outlet section 11 is the same.

Under these conditions, when the set temperature of the temperature type mixing valve 15 is set to 40°C and the hot water side valve 16 is opened,
Hot water at 85° C. in the hot water storage tank 3 flows from the bypass pipe inflow hole 13 and hot water at 85° C. in the bypass pipe 9 flows into the temperature-type mixing valve 15 as is. Then, the hot water is mixed with water from the water supply pipe 14 to reach a predetermined set temperature of 40° C. and is discharged. After the hot water at 85°C in the initial bypass pipe 9 flows, the cold dead water (approximately 5°C) in the hot water supply pipe 4 flows into the hot water supply inlet 1.
0, 50% of it flows through the bypass pipe 9, and the remaining 50% flows into the storage tank 3 from the bypass pipe outflow hole 12, and at the same time flows into the bypass pipe inflow hole 1.
From 3 to bypass pipe 9, now 85℃ in hot water tank 3
Let the hot water flow out. Therefore, in the pipeline from the bypass pipe inflow hole 13 to the hot water supply outlet section 11,
85°C hot water and 5°C water are mixed at a flow rate ratio of 1:1, that is, they flow into the thermostatic mixing valve 15 at a temperature of (85+5)/2=45°C. Then, the water is mixed with the original water (5° C.) that has passed through the water supply pipe 14 again and is automatically adjusted to a set temperature of 40° C., and then the hot water is discharged. Eventually, when the initially accumulated dead water in the hot water supply pipe 4 disappears, the original high temperature hot water (85°C) is supplied from the main heat source unit 1, but even in such a state, the temperature type mixing valve 15 The temperature is automatically adjusted to the set temperature in °C, so the set temperature is maintained from the beginning of use.
It is possible to have hot water at 40℃. Also, before the original high temperature hot water (85°C) reaches the bypass pipe 9 etc. from the main heat source device 1, the hot water side valve 16 may be closed, then opened immediately, closed again, or opened after a while. Even in the case of intermittent use, such as when the water is used in a hot water bath, the water temperature is guaranteed to be 40℃ from the beginning. Note that dead water from the hot water supply pipe 4 temporarily enters the hot water storage tank 3,
After that, the original high temperature water (85℃) from the main heat source machine 1
There are times when the high-temperature hot water pushes up the water in the hot water tank 3 (actually, it is naturally stirred due to the difference in specific gravity), but the volume of the hot water tank 3 can be calculated by substituting the volume of the hot water supply pipe 4. If you set the temperature to about half of the
You can get a constant amount of hot water.

Of course, when high temperature hot water (85°C) from the main heat source device 1 has already been delivered to the thermostatic mixing valve, it is also possible to dispense hot water of 40°C or higher by adjusting the set temperature.

In addition, a bypass pipe 9, a bypass pipe outflow hole 12,
All of the bypass pipe inflow holes 13 and the like are provided within the hot water storage tank 3 and are not in direct contact with the outside air. Therefore, the simple structure not only reduces the outer diameter, but also reduces heat radiation loss and improves the temperature distribution within the hot water tank 3.

Effects of the Invention As described above, the water heater of the present invention provides the following effects.

(1) When you open the mixed faucet, you can immediately get hot water at the desired temperature even in winter, so cold water (dead water), which was often thrown away when you opened the hot water faucet, can be used from the beginning. used for.

(2) Since the bypass pipe is installed inside the hot water tank,
The bypass pipe structure is simplified and the outer diameter is also reduced, which leads to miniaturization of the terminal water heater.

(3) Since the bypass pipe is installed inside the hot water tank,
There is no direct heat radiation loss from the bypass pipe surface.
Therefore, the economical efficiency becomes that much better.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a water heater according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional water heater. 1... Main heat source machine, 2... Heating element, 3... Hot water storage tank, 4... Hot water supply piping, 5... Mixing faucet, 6... Cold water inflow pipe, 7... Hot water outlet pipe, 8... Terminal hot water supply vessel, 9
... Bypass pipe, 10 ... Hot water supply inlet section, 11 ...
Hot water supply outlet section, 12... Bypass pipe outflow hole, 13...
...Bypass pipe inflow hole, 14...Water supply pipe.

Claims (1)

[Scope of Claims] 1. A main heat source machine having a cold water inflow pipe and a hot water outlet pipe, and a terminal water heater having a hot water storage tank in which a heating element is installed, wherein the hot water outlet pipe of the main heat source machine and the terminal water heater The hot water supply inlet of the terminal water heater is communicated with a hot water supply pipe, the hot water supply outlet of the terminal water heater and the water supply pipe are communicated with a mixing faucet, and the bypass pipe is inserted into the hot water storage tank, and the bypass pipe is connected to the hot water supply pipe. The hot water supply device is provided with a bypass pipe outflow hole for diverting the flow from the hot water supply pipe to the inner bottom of the hot water storage tank, and a bypass pipe inflow hole for allowing the flow from the upper part of the hot water storage tank to flow into the bypass pipe. 2. The hot water supply device according to claim 1, wherein the water supply device is configured such that the flow rate ratio between the flow rate branched to the inner bottom of the hot water storage tank and the flow rate directly flowing through the bypass pipe is approximately 1:1. 3. The water heater according to claim 2, wherein the flow rate ratio is set at at least one of the bypass pipe outflow hole and the bypass pipe inflow hole.