JPS599452A - Hot-water supplying system utilizing solar heat - Google Patents

Abstract

PURPOSE:To eliminate troublesome operations for preventing freezing by a method wherein the system is provided with a feed water pipeline, a pipeline for a solar heat hot-water heater, a pipeline for an auxiliary hot-water supplier, an electric five-way switching valve connected to a water discharging pipe and a temperature detecting element, in order to switch the electric five-way switching valve automatically when a temperature is approaching to a dangerous temperature for freezing. CONSTITUTION:When atmospheric temperature is decreasing and approaching to the dangerous temperature for freezing, the temperature detecting element 11 detects it and the electric five-way switching valve 9 switches a water circuit automatically by the switching signal of the automatic switching control device 12, therefore, water from a water feeding source is passed through the feed water pipeline 3, the electric five-way switching valve 9, the water and hot- water supplying pipeline 6, a three-way valve 7 and the auxiliary hot-water supplier 2, consequently, the water is changed to the hot-water and is supplied from a faucet 8. Water in the solar heat hot-water heater 1, the feed water pipeline 4 and the hot-water supplying pipeline 5 is discharged from the water discharging pipe 10 connected to the electric five-way switching valve 9.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a solar water heating system comprising a solar water heater and an auxiliary water heater that utilize solar thermal energy.

Conventional configuration and its problems This type of conventional solar hot water supply system was configured as shown in FIG. That is, in FIG. 2, 21 is a solar water heater, 22 is an auxiliary water heater, 23 is a water supply source, 24 is a water supply pipe to the solar water heater 21, 25 is a hot water supply pipe from the solar water heater 21, and 26 is an auxiliary water heater. Water supply/hot water supply piping to the water heater 22, 27 is a faucet, 28 is a three-way valve for switching the hot water supply circuit, and 29 is a two-way valve for opening and closing the circuit. In this solar hot water supply system, water from the water supply source is normally supplied to the solar water heater 21 through the water supply pipe 24. In the past, hot water stored in the solar water heater 21 is supplied directly to the faucet 27 through the hot water supply pipe 25 and the water/hot water supply pipe 26, or is supplied to the faucet 27 via the auxiliary water heater 22.

However, in the conventional configuration described above, when there is a risk of freezing at low temperatures, the solar water heater 21 cannot be used, so water is supplied directly from the water supply source 23 to the auxiliary water heater 22 through the water/hot water supply piping 26. Two-way valve 29,
In addition, in the conventional example shown in FIG.
switching of three-way valves 41.42 and two-way valves 43.44;
This requires a large number of valve operations, such as opening and closing operations to take precautions against freezing. As a result, these conventional examples have problems in terms of difficulty, uncertainty, and hassle of operation, complexity of piping, and construction cost.

OBJECTS OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to eliminate the difficulty and cumbersomeness of handling, and to provide a product easily and inexpensively.

[Described in Structure of the Invention]] In order to achieve the objective, the present invention provides a system that is located between a water supply pipe to a solar water heater, a hot water supply pipe from the solar water heater, and a hot water supply circuit connected to the hot water supply pipe. Each outlet is connected to the water supply pipe from the water supply source, the water supply pipe to the solar water heater, the hot water pipe from the solar water heater, the water supply/hot water supply pipe to the auxiliary water heater, and the drain pipe. A switching valve is installed, and a temperature detection element is installed in the water supply piping to the solar water heater to detect the outside temperature or water temperature. This is equipped with an automatic switching control device that issues a switching signal to the switching valve.

With the above configuration, for example, when the outside temperature drops and approaches the freezing danger temperature, the temperature detection element detects this,
In addition, the electric nearby switching valve automatically switches the water circuit in response to the switching signal from the automatic switching control device, which eliminates the troublesome operation of the antifreeze reservoir, which was a problem in conventional solar water heating systems. It is possible to eliminate complexity, difficulty, etc.

Description of examples Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, 1 is a solar water heater consisting of a heat collector 1a and a hot water storage tank 1b, 2 is an auxiliary water heater, 3 is a water supply pipe from a water supply source, 4 is a water supply pipe to the solar water heater 1, and 6 is a water supply pipe from a water supply source. A hot water supply pipe from the solar water heater 1, 6 a water supply/hot water supply pipe to the auxiliary water heater 2, 7 a three-way valve for switching the hot water supply circuit provided in the water/hot water supply pipe 6, 8 a faucet, and 9 a solar water heater 1
is a drain pipe, 11 is installed in the middle of the water supply pipe 4 to the solar water heater 1, and the outside air temperature or water temperature is detected 6--2! 12 is an automatic switching control device.

The operation in the above configuration will be explained. Normally, water from the water supply source is supplied to the solar water heater 1 through the water supply pipe 3, the electric nearby switching valve 9, and the water supply pipe 4 to the solar water heater 1. In addition, the hot water stored in the solar water heater 1 is supplied to a hot water supply pipe 5, an electric nearby switching valve 9, a water supply/hot water supply pipe 6 to the auxiliary water heater 2,
The water is supplied directly to the faucet 8 through the three-way valve 7 or via the auxiliary water heater 2. By the way, if the set temperature of the automatic switching control device 12 is set to the freezing danger temperature, for example, when the outside temperature drops and approaches the freezing danger temperature, the temperature detection element 11 detects this,
In addition, the electric nearby switching valve 9 automatically switches the water circuit according to the switching signal from the automatic switching control device 12, so that this switching operation causes water from the water supply source to be transferred to the water supply pipe 3 and the electric nearby switching valve 9. , the water/hot water supply pipe 6 , the three-way valve 7 , and the auxiliary water heater 2 , the hot water is turned into hot water and supplied from the faucet 8 . Water in the solar water heater 1 and water supply piping 4,
Water in the hot water supply pipe 5 is discharged from a drain pipe 10 connected to an electric nearby switching valve 9. This makes it possible to prevent equipment from being damaged during freezing without reducing the hot water supply function.

Furthermore, by making the mounting location of the temperature detection element 11 and the set temperature of the automatic switching control device 12 variable, it is possible to obtain the optimum switching timing for anti-freezing.

Effects of the Invention As described above, according to the present invention, for example, when the outside temperature drops and approaches the freezing danger temperature, the temperature detection element detects this, and the switching signal of the automatic switching device automatically switches the 41z
Since the dynamic five-way switching valve performs the switching operation of the water circuit, it is possible to eliminate the troublesome, complicated, and difficult operation of the antifreeze reservoir, which was a problem in conventional solar hot water heating systems. As a result, a highly reliable and easy-to-use hot water system can be obtained at low cost.

[Brief explanation of the drawing]

FIG. 1 is a piping configuration diagram of a solar heat hot water supply system showing an embodiment of the present invention, and FIGS. 2 and 3 are piping configuration diagrams of a solar heat hot water supply system showing conventional examples. 1... Solar water heater, 1a... Heat collector, 1b... Hot water storage tank, 2... Auxiliary water heater, 3... Water supply piping from the water supply source, 4...
...Water supply piping to the solar water heater, 6...Hot water supply piping from the solar water heater, 6...Water supply/hot water supply piping to the auxiliary water heater, 9... Electric nearby switching valve, 1
0...Drain pipe, 11...Temperature detection element, 12...Automatic switching control device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3

Claims (2)

[Claims] (1) A solar water heater consisting of a heat collector and a hot water storage tank, a water supply pipe to the solar water heater, a hot water pipe from the solar water heater, and a hot water supply circuit connected to the hot water pipe. In a solar water heating system comprising an auxiliary water heater, each of the solar water heaters is located between a water supply pipe to the solar water heater, a hot water pipe from the solar water heater, and a hot water supply circuit connected to this hot water pipe. A 50,000 electric switching valve is installed with the mouth connected to each of the water supply piping from the water supply source, the water supply piping to the solar water heater, the hot water piping from the solar water heater, the water supply/hot water supply piping to the auxiliary water heater, and the drain pipe. ,
In addition, a temperature detection element that detects the outside temperature or water temperature is installed in the water supply piping to the solar water heater, and is further connected to this temperature detection element, and when the set temperature is reached, a switching signal is automatically sent to the electric switching valve. Gives out 2,,-,. Solar hot water supply system equipped with automatic switching control device 0 (2) The solar heat hot water supply system according to claim 1, wherein the automatic switching control device is capable of varying a set temperature.