JPS648261B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 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 water heating system is
It was configured as shown in the figure. That is, in this FIG. 2, 21 is a solar water heater, 22 is an auxiliary water heater, 23 is a water supply source, and 24 is a solar water heater 2.
1, 25 is a hot water supply pipe from the solar water heater 21, 26 is a water supply/hot water supply pipe to the auxiliary water heater 22, 27 is a faucet, 28 is a three-way valve for switching the hot water supply circuit, 29 is a circuit opening/closing valve. It is a two-way valve. In this solar hot water supply system, water from a water supply source is normally supplied to the solar water heater 21 through the water supply pipe 24. In addition, the hot water stored in the solar water heater 21 is transferred to the hot water supply pipe 25 and the water/hot water supply pipe 2.
6 directly to the faucet 27, or via the auxiliary water heater 22. However, in the above conventional configuration, when there is a risk of freezing at low temperatures, the solar water heater 2
1 cannot be used, the two-way valves 29, 30, and 31 are opened and closed so that water is supplied directly from the water supply source 23 to the auxiliary water heater 22 through the water/hot water supply piping 26, and the solar water heater 21 The water must be drained by opening and closing the two-way valves 32, 33, and in the conventional example shown in FIG.
This method requires a large number of valve operations, such as switching and opening/closing operations of 4 to take measures in case of danger of freezing. As a result, these conventional examples have had problems in terms of operational difficulty, uncertainty, troublesomeness, complexity of piping, construction cost, etc.

Purpose of the Invention In view of the above-mentioned conventional problems, the present invention eliminates the difficulty and troublesomeness of handling, allows easy and low-cost reliable countermeasures against freezing, and uses solar heat to provide comfortable hot water supply. The purpose is to provide a hot water supply system.

Structure of the Invention In order to achieve the above-mentioned object, the present invention is provided 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 this hot water supply pipe. An electric five-way switching valve is installed with the mouth 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. , and a temperature detection element that detects the outside air 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 automatically switches to the electric five-way switching valve when the set temperature is reached. It is equipped with an automatic switching control device that issues a signal.

With the above configuration, for example, when the outside temperature drops and approaches the freezing danger temperature, the temperature detection element detects this, and the electric five-way switching valve automatically switches to the Since the circuit is switched, it is possible to eliminate the troublesomeness, complexity, and difficulty of operations for preventing freezing, which were problems in conventional solar hot water supply systems.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to 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 5 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
an electric five-way switching valve, 1, located between a water supply pipe 4 from the solar water heater 1, a hot water supply pipe 5 from the solar water heater 1, and a hot water supply circuit connected to the hot water pipe 5;
0 is a drain pipe, 11 is a temperature detection element provided in the middle of the water supply pipe 4 to the solar water heater 1 and detects the outside air temperature or water temperature, and 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 five-way 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 five-way switching valve 9,
The water is supplied directly to the faucet 8 through the water/hot water supply piping 6 to the auxiliary water heater 2 and the three-way valve 7, or is supplied to the faucet 8 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 will detect this and the automatic switching will start. Control device 12
The electric five-way switching valve 9 automatically switches the water circuit according to the switching signal, so this switching operation allows water from the water source to be routed to the water supply pipe 3, the electric five-way switching valve 9, and the water/hot water supply pipe 6. , the three-way valve 7 and the auxiliary water heater 2, the hot water is supplied from the faucet 8 as hot water. Further, the water in the solar water heater 1 and the water in the water supply pipe 4 and the hot water supply pipe 5 are discharged from a drain pipe 10 connected to an electric five-way 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 electric switch is automatically activated by the switching signal of the automatic switching device. Since the directional switching valve performs the switching operation of the water circuit, it is possible to eliminate the troublesome, complicated, and difficult operations for freezing prevention, which were problems in conventional solar hot water heating systems. A highly reliable and easy-to-use hot water supply 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, 5...Hot water supply piping from the solar water heater, 6...
Water supply/hot water supply piping to the auxiliary water heater, 9... Electric five-way switching valve, 10... Drain pipe, 11... Temperature detection element, 12... Automatic switching control device.

Claims (1)

[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 an auxiliary device installed in the middle of the hot water supply circuit connected to the hot water pipe. In a solar hot water supply system comprising a water heater, each outlet 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 supply pipe. Water supply piping from the water supply source, water supply piping to the solar water heater, hot water supply piping from the solar water heater, water supply to the auxiliary water heater.
An electric five-way switching valve connected to each of the hot water supply pipes and the drain pipe is provided, and a temperature detection element for detecting the outside air temperature or water temperature is provided in the middle of the water supply pipe to the solar water heater, and this temperature detection element and When connected and the set temperature is reached, the water supply pipe to the solar water heater and the hot water supply pipe and drain pipe circuit from the solar water heater are connected, and the water supply pipe from the water supply source and the water supply to the auxiliary water heater are connected. A solar hot water supply system equipped with an automatic switching control device that automatically switches the electric five-way switching valve so that it communicates with the piping.