JPH0370138B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to improving the usability of a water heater in which a terminal hot water supply port is located far away from a hot water source in a central water heating 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, it is inconvenient in actual use that not only does the cold water in the pipes come out, but it also takes time for hot water at a predetermined temperature to come out. As a means to eliminate such inconveniences and inconveniences, for example, Fig.
As shown in Publication No. 15562), a heat-retaining heating element 4 is internally installed in the middle of the piping 3 between the main hot water heat source 1 and the hot water supply port 2 of the terminal, and a cushion tank 5 is installed. The cold water in the pipe 3 and the hot water in the cushion tank 5 are mixed and flowed out from the hot water supply port 2, so that the cold water is not directly discharged from the hot water supply port 2.

Problems to be Solved by the Invention However, the above configuration has the following drawbacks because the main hot water heat source 1 and the cushion tank 5 are directly connected through the piping 3.

(1) It is necessary to place the cushion tank 5 near the hot water supply port 2, and the cushion tank 5 is placed in a visible position during use.
Unfavorable in terms of installation space and aesthetics.

(2) Even if the cold water in the pipe 3 mixes in the cushion tank 5, the temperature in the cushion tank 5 must not fall below the lower limit of the hot water supply temperature (30 to 40 degrees Celsius). .

(3) At the beginning of use, hot water in the cushion tank 5 will come out, but it will gradually cool down and the cushion tank 5 will cool down.
It is difficult to adjust the temperature of hot water because the hot water temperature rises again when hot water is supplied.

The present invention solves such conventional problems,
It can be installed anywhere, and the purpose is to supply a predetermined temperature immediately from the beginning of use.

Means for Solving the Problems In order to solve the above problems, the hot water supply apparatus of the present invention includes a main heat source device having a cold water flow pipe and a hot water outlet pipe, a heating body inside, and a hot water outlet pipe at the bottom. A hot water storage water heater having a hot water storage tank having an inlet passage communicating with the hot water tank and an outlet passage at the top through which hot water flows out, a control valve provided in the inflow passage, the inflow passage, the control valve, and the hot water storage tank. A bypass path provided so that the flow path resistance when flowing sequentially through the tank and the outflow path is equal to the flow path resistance when flowing directly from the inflow path to the outflow path, and a downstream confluence of the bypass path. , a secondary confluence point provided at a point where the water side pipes further merge, a terminal hot water supply port communicated with this secondary confluence point, a throttle part provided in the water side pipe, and the inflow path. and a temperature detection unit provided nearby to detect the temperature of the hot water supplied from the hot water tap, and the control valve is switched from opening to closing when the hot water supplied from the hot water tap reaches a predetermined temperature. and means for controlling the throttle section in response to a hot water temperature signal from the temperature detection section.

Effects According to the present invention, with the above-described configuration, the so-called cold dead water that has been stagnant in the light of the hot water outlet pipe of the main heat source device is first diverted and flows into two paths: the control valve of the hot water storage type water heater and the bypass path. . The dead water flowing toward the control valve pushes up the already heated hot water storage type water heater and high-temperature water from below, so this high-temperature water and the cold dead water flowing through the bypass path are combined. They get mixed up at the junction of the bypass road. The hot water then passes through a secondary confluence point and is discharged from the terminal hot water supply port. Next, when the dead water flows out and eventually the high temperature hot water from the main heat source machine flows, the control valve installed in the inflow path is closed by the signal from the temperature detection unit, and the high temperature water coming from the main heat source machine is closed. It will flow only through the bypass route. On the other hand, the constriction section provided in the water side piping is gradually opened in accordance with the temperature according to the signal from the temperature detection section. are mixed at the secondary confluence point and discharged from the terminal hot water supply port.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. In Fig. 1, 1 is a main heat source machine having a cold water flow pipe 2 and a hot water outlet pipe 3, 4 is a water side pipe connected to a water supply, etc., 5 is a hot water side valve disposed downstream of the hot water outlet pipe, and 6 is a water outlet pipe. The side valve 7 is a hot water storage type water heater installed downstream of the main heat source device 1, and has an inflow passage 8 at the bottom and an outflow passage 9 at the top, and a heating element 10 such as a sheathed heater inside. have. A bypass passage 11 branches from the inflow passage 8, is connected to the outflow passage 9 at a bypass passage confluence 12, and is further connected to the water side piping 4 at a secondary confluence 13, forming a terminal hot water supply port 1.
It is guided by 4. Reference numeral 15 denotes a temperature detection section provided near the inflow path 8;
A control valve 16 that is activated in response to a signal (electrical or mechanical signal) is disposed in the inflow passage 8, and a throttle portion 17 is disposed in the water side piping 4.

The control valve 16 operates to be fully open when the temperature at the location where the temperature detection section 15 is disposed is below a predetermined temperature, and to be fully closed when the temperature exceeds that temperature. Similarly, the throttle section 17 is fully closed when the temperature is below a predetermined temperature, and when the temperature rises, the opening section opens in response to the temperature and operates to increase the flow rate.

In the above configuration, cold dead water (temporarily 5°C in winter) is accumulated in the piping between the hot water outlet pipe 3 and the hot water side valve 5, and the hot water storage type water heater 7 is already heated to 85°C. It is assumed that hot water is stored. The temperature detection unit 15 operates to keep the control valve 16 fully open if the detected temperature is 45°C or lower, and to fully close the control valve 16 if it exceeds 45°C. Furthermore, also for the aperture part 17.
Fully closed at temperatures below 45℃;
When the temperature exceeds 100,000 yen, the opening corresponds to that temperature. In this state, when the hot water side valve 5 and the water side valve 6 are opened, water in the water side piping 4 does not flow because the opening degree of the throttle part 17 is in the fully closed state. On the other hand, hot water side valve 5
Since the control valve 16 is fully open, the cold dead water that enters from the inflow path 8 through the temperature detection unit 15 enters the hot water storage type water heater 7 and pushes up the already heated 85°C hot water. The 85° C. hot water pushed out from the outflow path 9 is mixed with cold dead water flowing from the bypass path 11 up to the bypass path confluence point 12. (The initial hot water temperature at the bypass confluence 12 is determined by the ratio of the amount of 85°C hot water flowing through the outflow path 9 and the amount of cold dead water flowing through the bypass path 11. If the passage resistance of the bypass passage 11 or the outflow passage 9 is determined in advance so as to be 1:1, the temperature will be 45°C.
Hot water is poured from the bath. Then, the cold dead water that was initially retained passes through the temperature detection section 15, and eventually,
When the originally high temperature water (temporarily assume 85°C) flows from the main heat source device 1 and detects that the temperature has reached 45°C, the control valve 16 is fully closed and the inflow path 8 is closed. be done. Therefore, only the flow is from the bypass path 11. On the other hand, since the throttle section 17 is configured to open in response to the temperature detected by the temperature detection section 15,
The high-temperature water from the main heat source device 1 that has passed through the bypass path 11 and the water that has passed through the water side pipe 4 are mixed at a secondary confluence point 13 and then discharged from the terminal hot water supply port 14. Therefore, a predetermined amount of hot water can be obtained continuously from the moment the hot water side valve 5 and the water side valve 6 are opened. Furthermore, when hot water is tapped intermittently over a relatively short period of time, the high-temperature water downstream of the hot water tap 3 is difficult to cool down suddenly, so hot water can be quickly heated even in such a state.
Furthermore, in the case of intermittent hot water supply over a long period, the water in the hot water storage type water heater 7 is already brought to a predetermined temperature 8 by the heating element 10.
Since the temperature has been raised to 5°C, the operation will be the same as the first one.

In addition, in response to seasonal fluctuations, not only the water temperature and dead water temperature change, but also the desired hot water temperature from the terminal hot water supply port 14 changes, so in this case, the set temperature of the hot water storage type water heater 7 and the main heat source device 1 All you have to do is change.

Effects of the invention (1) It is easy to use because the predetermined hot water temperature can be obtained immediately after starting hot water supply.

(2) The first flowing water that accumulates in the hot water outlet pipe of the main heat source equipment and becomes cold is divided into two directions, the inflow path and the bypass path, and the water that flows from the inflow path flows into the hot water storage tank from below. The capacity of the hot water storage tank can be reduced by forcing the hot water into the outflow path. Therefore, it is economical because the installation space, the capacity of the heating element, and the amount of heat radiation are reduced.

(3) When a predetermined temperature is reached, the control valve is closed and the temperature of the hot water supplied from the main heat source equipment is automatically regulated by the throttle section installed in the water side piping. While using this temperature-controlled hot water, the first water that flows into the hot water storage tank is immediately heated and recovers to the set temperature, so it is recommended to stop using the hot water supply and start both hot water discharges without too much of an interval. You can obtain the specified water temperature even when using the water for various purposes. This effect is greater during the harshest winter months.

(4) Since a control valve is provided in the inflow path on the upstream side of the hot water storage tank, there is no need to take severe pressure resistance into consideration for the hot water storage tank, which has the advantage of increasing the degree of freedom in selecting the material and shape of the hot water storage tank. be.

[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, 7... Hot water storage type water heater, 8...
Inflow channel, 9... Outflow channel, 10... Heating body, 11...
... Bypass road, 12 ... Bypass road confluence, 13
...Secondary confluence, 14...Terminal hot water inlet, 15...
Temperature detection section, 16... control valve, 17... throttle section.

Claims (1)

[Claims] 1. A hot water storage tank having a main heat source device having a cold water flow pipe and a hot water outlet pipe, a heating element inside, an inlet passage communicating with the hot water outlet pipe at the lower part, and an outlet passage from which hot water flows out at the upper part. A hot water storage type water heater having;
A control valve provided in the inflow path, a flow path resistance when flowing sequentially through the inflow path, the control valve, the hot water storage tank, and the outflow path, and a flow path resistance when flowing directly from the inflow path to the outflow path. A bypass path provided so that the two sides are equal, a secondary confluence point provided at a point downstream of the confluence point of this bypass path, and a point where the water side piping further merges, and a secondary confluence point that is connected to this secondary confluence point. The hot water supply method includes a terminal hot water supply port, a throttle part provided in the water side pipe, and a temperature detection part provided near the inflow path to detect the temperature of hot water supplied from the hot water outlet pipe, The hot water supply device controls the control valve from open to closed when the hot water reaches a predetermined temperature, and controls the throttle section in response to a hot water temperature signal from the temperature detection section.