JPS59215549A - Freeze preventive device by drainage for solar heat water heater - Google Patents

Abstract

PURPOSE:To prevent outdoor piping from freezing, by providing valves which can feed water into a water heater in the normal operating conditions, and can drain water from the piping for the time when freezing is anticipated. CONSTITUTION:When an indoor feedwater valve 22 is opened to start feeding, the fed water rising upward through a feedwater pipe, filling a cistern 3 with water, is fed into a storage tank 1 from a needle valve seat 17. When a float 19 is gradually floated upward to reach the normal highest water level, the needle valve seat 17 is closed by a needle valve 18 which stops feeding of water. When freeze is anticipated, the feedwater valve 22 is closed and a drainage valve 23 is opened, then the air is penetrated from the needle valve seat 17 to drop the water down through a feedwater pipe 2, and next, the water in the cistern 3 is also drained, being displaced with air. Then a volumetric body 4 that is a floater loses its buoyancy, falling down due to its own weight, at the same time an outer lever arm 7 is moved to a rising position, a string 8 is tensioned to pull up a feed-hot-water main valve 10 to seat it closely in its valve seat 11 to bring the valve 10 into the closed position. At that time when an indoor valve 24 is opened, the negative pressure is produced in a feed-hot-water pipe 16 to allow the air coming into it through an air intake pipe 15, and the hot-water in the outdoor feed hot-water pipe 16 is all drained passing through the feed hot-water valve 24 until the pipe 16 becomes empty. By this method both pipes are prevented from freezing.

Description

[Detailed description of the invention] The invention uses natural circulation of hot water in the collector.

Water is stored in the hot water storage tank placed above the water supply pipe or collector drain pipe, which should be filled with water under normal operating conditions, or in a container connected to these. Simple operation is achieved by connecting the force applied to the equipped volume, which changes by the buoyancy of the volume when it is filled with water and when it is drained, to the operation of the valve function necessary for freezing prevention. The aim is to prevent freezing of parts that are exposed to the outdoors and are likely to freeze.

To explain the present invention with reference to an embodiment, a floating body 4 is built in a reservoir housing 6 near the top of a water supply pipe 2 to supply water to a hot water storage tank 1 of a solar water heater, and a fulcrum It is fixed to an internal lever arm 6 that is swingable about a shaft 5, and is configured such that an external lever arm 7 can swing up and down via the fulcrum shaft 5 as the floating volume moves up and down.

A cable 8 is attached to the tip of this external lever arm 7, and its lower end freely passes through the valve housing 9 to hold the hot water supply valve 10. It closely contacts a seat 11 and blocks hot water coming in through a flexible pipe 14 from a hot water supply suction port 16 supported by a float 12 floating on the water surface.

An air suction pipe 15 and a hot water supply pipe 16 to the interior are opened from the lower part of the valve housing 9, which protrudes above the water level of the hot water storage tank.
are connected and communicated.

Further, the needle valve seat 17. Water is supplied into the hot water storage tank through the ball tap configuration of the needle valve 18° float 19.

Note that there is an overflow/ventilation pipe 20 above the common water level of the hot water storage tank, which communicates with the outside air.

In the room in FIG. 2, a water pipe 21 is connected to a water supply pipe 2 via a water supply valve 22, and a drain valve 26 is provided on the water supply pipe 2 near the water supply valve. Further, a hot water supply valve 24 is provided at the end of the indoor hot water supply pipe 16, and hot water is supplied to a bathtub or the like 25.

To explain the operation, when the indoor water supply valve 22 is opened and water is supplied, water goes up the water supply pipe and fills the reservoir casing 6.
Water is supplied into the hot water storage tank from the needle valve seat 17, but the float 19 gradually rises until it reaches the highest water level for normal use, and the needle valve seat 17 is closed by the needle valve 181C, and water supply stops.

Simultaneously with the start of water supply into the hot water storage tank, the inside of the storage casing 6 is filled with water, and the floating volume object 4 receives a buoyant force corresponding to its volume, assumes a raised position as shown in the figure, and moves through the fulcrum shaft 5. Since the external lever arm 7 assumes the lowered position as shown in the figure, the cable becomes loose and the hot water valve 10 opens due to its own weight and the water pressure applied to the valve body, and hot water is supplied from the hot water suction port 13 to the hot water pipe 16. be done. Therefore, when the indoor hot water supply valve 24 is opened, hot water is supplied to a bathtub or the like.

(・Well, when freezing is expected, some hot water is available.

Assuming that the water level in the hot water storage tank has fallen a little and the needle valve seat 17 is open, the water supply valve 22 is closed and the drain valve 26 is opened (then air enters through the needle valve seat 17 and the water in the water supply pipe 2 falls, The water in the reservoir casing 6 also drains out, and the water is replaced with air.

As a result, the volumetric object 4, which is a t$ body, loses its buoyancy and descends to the position shown by the dotted line due to its own weight, and at the same time, the external lever arm 7 assumes the raised position, and the cable 8 is pulled to pull up the hot water supply valve 10 and the valve seat 11. Close the valve to the closed state. For this reason,
When the indoor hot water supply valve 24 is opened, the inside of the hot water supply pipe 16 becomes negative pressure, allowing air to enter through the air suction pipe 15, and the outdoor hot water supply pipe 1 is opened.
All of the hot water in the tank 6 comes out from the hot water valve 24 and becomes empty.

In other words, if you drain the water in the water supply pipe from the water supply water drain valve,
At the same time, they are automatically linked, allowing only the water in the hot water pipes exposed to the outdoors to be drained while leaving the hot water in the hot water storage tank intact, making it possible to completely prevent freezing by emptying both pipes.

In this embodiment, the reservoir housing 6, which serves as a driving source, is installed at the top of the water supply pipe, but it can be installed not only on the water supply pipe, but in any place where the water heater is filled with water under normal operating conditions and is used as a space-time body to prevent freezing. Getting is self-explanatory.

For example, the purpose can be achieved even if it is installed in the middle of the water drain pipe of the heat collector.

In addition, in this embodiment, the hot water supply valve 1 is
However, as shown in Patent Application No. 13665 of 1982 and Patent Application No. 32844 of 1981, this movement is further controlled by opening and closing of the water collector drain valve or It can be linked to the opening and closing of the valve of the water supply pipe to the heater and the valve of the hot water return pipe of the heat collector, either singly or in any combination.

[Brief explanation of drawings]

Figures 1 and 2 are a cross-sectional view and a piping diagram. In the figure 1...
・Hot water storage tank, 2... Water supply pipe 3... Reservoir
Re-housing, 4... Volume 5... Support shaft, 6... Internal lever arm 7... External lever arm, 8
... cable? ... Valve housing, 10... Hot water supply base Valve 11... Valve seat, 12... Float 16
...Hot water inlet, 14... Flexible pipe 15... Air suction pipe, 16... Supply/drain pipe 17... Needle valve seat 2
18... needle valve 19... float,
20...Oats flow and ventilation pipe 21...Water
Water pipe, 22... Water supply valve 26... Drain valve, 2
4. Hot water supply valve 25... Bathtub, etc. Patent applicant Mibe Yui

Claims (1)

[Claims] (1) The water supply pipe or water drain from the collector should be filled with water under normal operating conditions of a solar water heater that stores hot water in the hot water storage tank placed above it through the natural circulation of hot water in the collector. To prevent freezing in service pipes or vessels connected to them, when the water in the pipes or vessels is drained by opening the valve and replaced with air and becomes an empty body, By utilizing the fact that the force applied to a volume of water changes by the amount equivalent to the buoyancy force, this force variation can be controlled by the valve function of the hot water pipe in the hot water storage tank, the opening/closing of the water collector drain valve, or the water flow to the heat collector. A water drain/freeze prevention device for a solar water heater, characterized in that it is connected to the opening/closing of a valve of a supply pipe and a valve of a hot water return pipe from the same heat collector, either alone or in any combination.