JPH0234260Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a water draining mechanism for preventing freezing in water supply systems such as hot water supply devices for baths, kitchens, etc. and water supply related devices.

(Prior art and its problems) In order to prevent damage to water supply systems due to freezing of residual water in winter, anti-freezing measures must be taken.

Conventionally, such antifreeze measures include wrapping a cord heater over a wide area of a water circuit such as a heat exchanger or water switch, or fixing a cement heater to a part of the water circuit with metal fittings, etc. There are devices that prevent freezing by generating heat from an electric heater, and devices that prevent freezing by installing a drain pipe with a stopper at the bottom of the appliance to drain water from areas that should be prevented from freezing. be.

However, although the former method can reliably prevent freezing during normal operation, it has problems such as the need for wiring to a power source, consumption of power, risk of electrical leakage, and high cost. In the latter case, there is no problem with using an electric heater, and as long as you drain the water as required, you can definitely prevent freezing. There is a problem that if water is not drained sufficiently due to lack of practice or inexperience, freezing prevention cannot be achieved.

The object of the present invention is to solve the above-mentioned conventional problems and to make it possible to reliably prevent freezing without using an electric heater. The present invention will be explained below based on drawings corresponding to embodiments.

(Means for Solving the Problems) In the figure, reference numeral 1 indicates an appropriate water supply system such as a hot water supply device for a bath, a kitchen, etc., and water supply related devices. Further, reference numeral 2 indicates a portion of the water supply system 1 from which water should be drained. Therefore, the present invention provides three-way valves for three water supply pipes located upstream and below the portion 2 to be drained, with the downstream side corresponding to the common port c and the other port a corresponding to the upstream side. 4. A drain pipe 5 which is always open is provided at the other port b. The three-way valve 4 may be manually operated or automatically operated. still,
A water supply system 1 shown in FIG. 1 is a hot water pouring system for supplying hot water that has passed through a heat exchanger 6 of a water heater to a bath 7. 1 includes an atmosphere opening section 9 provided with a hopper section 8.

(Operation) The operation of the present invention will now be explained based on FIG. First, when the three-way valve 4 is operated to bring the common port c and port a into communication as shown in FIG. The water flows through the water supply pipe 3, passes through the atmosphere opening part 9, and is supplied to the bath 7 by a pump (not shown) or the like.

Next, when the three-way valve 4 is operated to stop the supply of hot water to the bath 7 and the common port c and port b are brought into communication as shown in FIG.
The supply of hot water is stopped, the hot water in the atmosphere opening part 9 is discharged to the bath 7, and the hot water in the portion of the water supply pipe 3 above the three-way valve 4 is also drained from the common port c to the port b due to its own weight. After that, the water is drained from the drain pipe 5. In this way, water can be reliably drained from the portion 2 to be drained, including the atmosphere opening portion 9 and the water supply pipe 3. Furthermore, the present invention can also drain all the water inside the three-way valve 4.

(Other Embodiments) FIG. 2 shows the mechanism of the present invention applied to a stop water heater 10, in which reference numeral 11 is a tap water outlet, 12 is a water supply section, and 13 is a heat exchange section. In this configuration, water can be drained from the water supply pipe 3 extending from the three-way valve 4 to the hot water outlet 11 by stopping the water supply by the three-way valve 4, which also serves as water volume adjustment, by the above-described operation. Further, FIG. 3 shows the mechanism of the present invention applied to a water supply system of a washroom or the like, where 14 is a hot water mixer faucet and 15 is a washstand. In such a configuration, hot water and tap water supply operations can be performed using push button 1.
6, by operating the three-way valve 4, water can be drained upward from the three-way valve 4. In this way, the present invention can be applied to any appropriate water supply system.

(Effects of the invention) As described above, the present invention can be applied to the lower water supply pipe on the upstream side of the part where water should be drained in the water supply system, with the downstream side as the common port and the other port on the upstream side. The three-way valve is configured to correspond to the water supply, and the other port is configured with a drain pipe that is always open, so the drain pipe does not interfere with water supply, and when the three-way valve is turned off, the water supply is automatically stopped. Water can be drained through the drain pipe in the event of a sudden cold wave, without having to do the troublesome and easily forgotten operations of plugging and unplugging the drain pipe. Even in such cases, there is an effect of being able to reliably prevent freezing. In particular, the present invention has the effect of preventing the three-way valve itself from freezing, since all of the water within the three-way valve can be drained away.
It goes without saying that the present invention can be applied to any part of any water supply system in addition to the above-mentioned embodiments, as long as water can be drained from the part by means of a drain pipe.

[Brief explanation of the drawing]

FIGS. 1a, b, and c are explanatory views showing the structure and operation of an embodiment to which the present invention is applied, and FIGS. 2 and 3 are explanatory views showing the structure of other embodiments. Code 1... Water supply system, 2... Portion to drain water, 3... Water supply pipe, 4... Three-way valve, 5... Drain pipe, 6... Heat exchanger, 7... Bath, 8... Hopper. Part, 9... Atmospheric opening part, 10... Shut-off water heater, 11... Hot water outlet, 12... Water supply part, 13...
Heat exchange unit, 14... Hot water mixer faucet, 15... Wash basin, 16... Push button, a, b, c... Three-way valve port.

Claims (1)

[Scope of utility model registration request] In the water supply system, a three-way valve is configured in the lower water supply pipe on the upstream side of the part where water is to be drained, so that the downstream side corresponds to the common port and the other port corresponds to the upstream side. A water drainage mechanism for preventing freezing in a water supply system, characterized in that a drain pipe that is always open is configured in a port of the water supply system.