JPS6210557A - Hot water supply system - Google Patents

Abstract

PURPOSE:To reduce the space occupied by an auxiliary water heating source unit as well as the heat release loss by connecting the auxiliary water heating source unit close to the hot water outlet of the first passage connecting the main water heating source unit and the hot water outlet, and providing an opening/closing valve that opens/closes the second passage branched from the first passage depending on the temperature of the auxiliary water heating source unit. CONSTITUTION:When hot water is to be dispensed, the hot water regulator valve 21 and the water regulator valve 22 disposed in the hot water outlet 2 are opened to a desired amount. In response, cold water filling the hot water pipe 6 flows into the hot water reservoir 9. If the temperature detected by the sensor 19 is lower than the set temperature of the opening/closing valve 17, the solenoid valve 18 is opened, and part of the incoming cold water from the hot water pipe 6 pushes up the hot water in the hot water reservoir 9. It also flows to the bypass pipe 14 to be mixed with high temperature hot water from the hot water reservoir 9 in the primary mixing section 24, and flows on to the secondary mixing section 23, while the rest of the cold water flows to the auxiliary hot water delivery pipe 15. When hot water from the main water heating source unit 1 reaches the hot water reservoir presently, the set temperature of the opening/closing valve 17 will be exceeded to cause the solenoid valve 18 to be closed, whereupon all of the hot water flowing in the hot water pipe 6 is routed through the auxiliary water heating source unit 7 to be dispensed out of the hot water outlet 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hot water supply apparatus in which a terminal hot water outlet is located far away from a hot water supply heat source 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 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 Japanese Patent No. 15562), a cushion tank 5 with a heat-retaining heating element 4 inside is installed in the middle of the piping 3 between the main hot water heat source 1 and the hot water outlet 2 of the terminal. The cold water and the hot water in the cushion tank 5 are mixed and flowed out from the tap 2, so that the cold water is not directly discharged from the tap 2.

Problems to be Solved by the Invention However, in the conventional configuration described above, the main hot water heat source 1 and the cushion tank 5 are directly connected through the pipe 3, and all of the cold water in the pipe 3 and the hot water in the cushion tank 5 are mixed. Because the hot water was being drained out, hot water comes out immediately at the beginning of use, but in order to prevent the temperature of the hot water from the hot water supply port 2 from falling below the lower limit of the hot water supply temperature (generally 30'C to 40°C). , the capacity of the cushion tank 5 had to be larger than the capacity of the water in the pipe 3.

Therefore, not only the installation space and weight become large, but also the heat radiation loss from the cushion tank increases.

Means for Solving the Problems The present invention solves these conventional problems.
a main hot water heat source device, a hot water outlet having a hot water flow control valve, a first channel connecting the main hot water heat source device and the hot water outlet, and a sub-channel connected to the first channel near the hot water outlet. a second flow path branching from the first flow path between the main hot water heat source device and the auxiliary hot water heat source device; It is equipped with an on-off valve that opens and closes the second flow path.

Effect of the present invention With the above-described configuration, when the hot water flow control valve is opened, the cold water accumulated in the first flow path between the main hot water heat source device and the hot water outlet flows into the sub hot water heat source device. When the temperature of the vessel drops, the on-off valve of the second flow path is opened, and the cold water in the first flow path is divided into two into the sub-hot water heat source and the second flow path, and a portion of the cold water is sent to the sub-hot water supply. Allow it to flow to the heat source. Therefore, the amount of hot water that can be stored in the auxiliary hot water heat source device can be reduced by the amount of cold water flowing out from the second flow path. Eventually, the hot water from the main water heater reaches the auxiliary water heater, and when the temperature of the auxiliary hot water heater rises, the on-off valve is closed, and all the hot water from the main water heater flows to the outlet, allowing continuous hot water supply. It becomes possible.

Example An embodiment of the present invention will be described below with reference to FIG.

In the figure, a main hot water heat source 1 and a hot water outlet 2 are connected by a hot water supply pipe 6, which is a first flow path, and a sub hot water heat source 7 is connected to the hot water supply pipe 6 near the hot water outlet 2. The auxiliary hot water heat source device 7 has an electric heater 8 internally installed at the bottom of the hot water storage tank 9, and maintains a predetermined high temperature by controlling the heater input with a hot water temperature controller 11 according to the temperature detected by a hot water temperature thermometer 10. are doing. At the lower end of this hot water storage tank 9 is an inlet pipe 12. An outlet pipe 13 is provided at the upper end, and the inlet pipe 12 and outlet pipe 13 are connected in parallel to the hot water storage tank 9 via a bypass pipe 14. Upstream of the auxiliary hot water heat source device 7 of the hot water supply piping 6, a branch portion 16 to the auxiliary hot water outlet pipe 15, which is a second flow path, is installed to connect the flow from the main hot water heat source device 1 to the auxiliary hot water heat source device 7 side. It is divided into two parts on the hot water outlet pipe 15 side.

An on-off valve 17 for opening and closing the auxiliary hot water tap pipe 15 is provided on the side of the auxiliary hot water tap pipe 15 of the branch portion 16. The on-off valve 17 includes a solenoid valve 18 inserted into the auxiliary hot water tap 15, a temperature sensor 19 that detects the water temperature at the bottom of the hot water tank 9, and a temperature sensor 19.
Controller 2 that controls the opening and closing of the solenoid valve 18 based on the signal of
0, the solenoid valve 18 is controlled to close when the temperature detected by the temperature sensor 19 exceeds a preset temperature, and to open the solenoid valve 18 when the temperature detected by the temperature sensor 19 falls below the set temperature. Ru. The hot water outlet 2 is a hot water flow control valve 2.
1 and the outlet of the water flow control valve 22 are connected by a secondary mixing section 23, so that the mixed hot water flows out. This hot water flow control valve 21 is connected to a primary mixing section 24 which is a confluence point of the outlet pipe 13 and the bypass pipe 14 . On the other hand, the water supply pipe 25 connects the main hot water heat source 1 and the water flow control valve 2 from the water pipe 26.
2 is connected to supply tap water.

In the above configuration, when using hot water, the hot water flow control valve 21 and the water flow control valve 22 are opened to an arbitrary degree, and at this time, the cold water stagnant in the hot water supply pipe 6 flows into the hot water storage tank 9, and the temperature sensor 1
If the detected temperature of the hot water tank 9 is lower than the set temperature of the on-off valve 17, the solenoid valve 18 is opened, and one side of the flowing cold water from the hot water supply pipe 6 works to push up the hot water in the hot water storage tank 9, and also to push up the hot water in the bypass pipe 14. The water flows to the primary mixing section 24 where it mixes with the high temperature hot water in the hot water storage tank 9, and flows to the secondary mixing section 23 at an appropriate temperature.

The other side of the cold water in the hot water supply pipe 6 flows to the auxiliary hot water outlet pipe 15. When hot water from the main water heater 1 eventually reaches the hot water storage tank 9, the temperature detected by the temperature sensor 19 rises to exceed the set temperature of the on-off valve 17, and the solenoid valve 18 closes. Therefore, all the hot water flowing through the hot water supply pipe 6 passes through the auxiliary hot water heat source 7 and flows out from the hot water outlet 2. On the other hand, in the auxiliary hot water heat source 7, the cold water that has accumulated in the hot water storage tank 9 begins to flow out, but the bypass pipe 1
Since the hot water from the main water heater 1 flows into the main water heater 4, the temperature of the hot water in the primary mixing section 24 hardly decreases, and continuous hot water supply is possible. After the hot water supply is stopped, the hot water storage tank 9 is always kept at a high temperature, so the electromagnetic valve 18 remains closed, and no hot water is wasted from the auxiliary hot water pipe 16.

As described above, the amount of water flowing out from the auxiliary hot water supply pipe 15 does not flow to the auxiliary hot water heat source device 7, so even if the capacity of the hot water storage tank 9 is reduced accordingly, the auxiliary hot water heat source device 7 will not run out of hot water. Therefore, the capacity of the hot water storage tank 9 can be reduced, and the installation space and weight of the auxiliary hot water heat source 7 can be reduced.

In addition, since the bypass pipe 14 is provided in parallel with the hot water storage tank 9, the amount of water flowing into the hot water storage tank 9 is divided into two, and the amount of water flowing into the hot water storage tank 9 is divided into two.
Capacity can be reduced.

Furthermore, since hot water can be obtained immediately after hot water supply starts, it is not only convenient to use, but also efficient because water from the auxiliary hot water pipe 15 can be used at the same time.

Although the main hot water heat source device in the embodiment was not limited, if it was a gas instantaneous water heater, it would not ignite unless the amount of water exceeded the ignition water amount, so hot water could not be supplied with a small amount of water in some cases. According to the present invention, if the water volume in the second flow path is set to a value larger than the ignition water volume, the gas instantaneous water heater can be stably ignited even when a low water volume is supplied at the outlet. It is possible.

As described in detail, the water heater of the present invention provides the following effects.

(1) Since the water stagnant in the first flow path flows not only to the auxiliary water heater but also to the second flow path, the hot water storage capacity of the auxiliary hot water heater can be reduced, reducing installation space and auxiliary hot water supply. This reduces the heat radiation loss of the heat source device.

(2) The water accumulated in the first flow path is mixed and heated by the auxiliary hot water heat source near the hot water outlet, so the time from opening the hot water tap at the hot water outlet until hot water comes out is extremely shortened, making it easier to use. is good.

(3) Since the water stagnant in the tenth flow path can be taken out separately from the second flow path, the stagnant water can be reused and energy is saved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a water heater showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional water heater. 1... Main hot water heat source, 2... Hot water outlet,
6...First flow path, 7...Sub-hot water heat source device, 15...Second flow path, 17...Opening/closing valve, 21. ...Hot water flow control valve.

Claims (3)

[Claims] (1) A main water heater, a hot water outlet having a hot water flow control valve,
a first flow path connecting the main hot water heat source device and the hot water outlet; a sub hot water heat source device connected in the vicinity of the hot water outlet of the first flow path; the main hot water heat source device and the sub hot water heat source. A water heater comprising: a second flow path branching from the first flow path between the water heater and the water heater; and an on-off valve that opens and closes the second flow path depending on the temperature of the auxiliary hot water heat source. (2) The on-off valve closes the second flow path when the temperature of the auxiliary hot water heat source device exceeds a preset temperature, and opens when the temperature of the auxiliary hot water heat source device is below the preset temperature. A water heater according to claim 1. (3) The opening/closing valve is composed of a solenoid valve inserted in the second flow path, a temperature sensor that detects the water temperature of the auxiliary water heater, and a controller that controls opening and closing of the solenoid valve according to the signal from the temperature sensor. A hot water supply device according to claim 1 or 2.