JPH0113961Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a solar water heating system in which an air release valve is provided at the top of the circulation piping between an open hot water storage tank and a heat collector, and the circulation pump also serves as a hot water pump. It is something.

A conventional water heater of this kind will be explained based on FIG. 1. 1 is a heat collector, and 2 is a hot water storage tank open to the atmosphere. Reference numeral 3 denotes a circulation pipe connecting the two, in which a circulation pump 4 is interposed in the outgoing pipe 3a to the heat collector 1, and an air bleed valve 5 is provided at the top of the return pipe 3b of the circulation pipe 3.
is provided. Inside the hot water storage tank 2, the inlet of the outgoing pipe 3a of the circulation pipe 3 is opened at the upper part of the hot water storage tank, and the discharge port of the return pipe 3b is opened below the suction port. An automatic hydrant 6 is provided which detects water with a ball tap and replenishes water. The hot water tank 2 has a gap 7 above the water level controlled by the automatic water tap 6, and this gap 7 prevents the hot water tank 2 from overflowing even if water from the heat collector 1, etc. returns to the hot water tank 2. A certain amount of volume has been secured. 8 is a hot water supply pipe branched from the downstream of the circulation pump 4, and a solenoid valve 9 that is closed when hot water is supplied is provided downstream of the branch point of the outgoing pipe 3a.

In such a conventional example, when the circulation pump 4 is stopped, the water in the heat collector 1 above the hot water storage tank 2 and the circulation pipe 3 returns to the hot water storage tank 2. Therefore, even if the outside temperature drops in winter, there is no risk of the heat collector 1 etc. freezing and being damaged, and since hot water is supplied from the top of the hot water storage tank 11, piping is simple and the hot water supply characteristics are good. It is good, but since an open hot water storage tank is used, the circulation pump 4
When the pump is operated, air is sucked into the returning water through the air bleed valve 5, and the air in the hot water storage tank 2 is sucked into the outgoing pipe 3a from the suction port at the top again, thus causing problems such as air bite in the circulation pump 4 and generation of noise. It was hot.

The present invention is intended to solve the problems of the conventional example, and the differences from the conventional example will be specifically explained below based on an illustrated embodiment. Reference numeral 11 denotes a hot water storage tank open to the atmosphere, which is similar to the conventional example. The outgoing pipe 13a of the circulation pipe 13 penetrates the bottom of the hot water storage tank 11 and has its suction port 14 opened into the tank, and the return pipe 13b penetrates the top of the hot water storage tank 11 and is arranged downward. A discharge port 15 is opened below the suction port 14 in the tank. Reference numeral 16 denotes an automatic water tap that detects a drop in the water level in the hot water tank 11 and replenishes water. In addition, a gap 17 is provided in the hot water storage tank 11 above the set water level, and this gap 17 has a sufficient volume to prevent the hot water storage tank 11 from overflowing even if water from a heat collector or the like returns to the hot water storage tank 11. . 18 is a cylindrical body that surrounds the return pipe 13b in the hot water storage tank 11 at least below the water surface;
An outlet 19 is provided below the outlet 15 of the return pipe 13b of the cylindrical body 18. 20 is a mounting plate for the cylindrical body 18. In this embodiment, the cylindrical body 18 has an open upper end, a closed lower end, and an outlet provided in the lower peripheral wall.

In the above configuration, when the circulation pump is stopped, the water in the heat collector above the hot water storage tank 11 and the circulation pipe 13 falls into the hot water storage tank 11 and is prevented from freezing.

Also, during operation of the circulation pump, air is sucked into the return water from the air release valve, and the air-containing water flows into the return pipe 13b.
When the air is discharged from the discharge port 15 of the cylinder body 8, the air in the returned water is discharged from the discharge port 1 provided below the discharge port 15 of the cylinder body 8.
9, it is separated and the cylinder body 18 and the return pipe 1 are separated.
3b and is discharged to the upper part of the hot water storage tank 11, while the returned water from which air has been removed enters the hot water storage tank 11 from the outlet 19 and is replaced with cold water in the hot water storage tank 11. Therefore, as in the conventional case, the return pipe 1
The air separated from the return water discharged from the discharge port 15 of the pump 3b is not sucked into the outflow pipe 13a again and sent to the circulation pump.

As explained above, the present invention consists of a heat collector and an open hot water storage tank with a gap above the water surface for water to fall, an outgoing pipe with a circulation pump interposed therein, and a return pipe with an air bleed valve at the top. They are connected by a pipe, and the suction port of the outgoing pipe is opened at the upper part of the hot water storage tank, the discharge port of the return pipe is opened below the suction port, and the hot water supply piping is branched from the downstream position of the circulation pump of the outgoing pipe. , in which the outgoing pipe downstream of this branch point is provided with a solenoid valve that is closed during hot water supply, the return pipe is arranged downward in the hot water storage tank, and the upper end of this return pipe is opened in the gap above the water surface. Since it is surrounded by a cylindrical body and an outlet is provided below the discharge port of the cylindrical body,
Even if air is mixed into the return water, this mixed air is always discharged within the hot water storage tank, so no air trapping occurs in the circulation pump. In addition, the air separated from the return water rises only within the cylinder and is discharged without passing through the water stored in the hot water tank, so the water level in the tank does not fluctuate, which also has the effect of noise prevention. be.

In addition, by changing the position of the outlet of the cylinder up and down, or by moving the cylinder up and down, the amount of high-temperature water in the hot water storage tank can be easily changed.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing a conventional example, and FIG. 2 is a sectional view of essential parts showing an embodiment of the present invention. 11...Hot water storage tank, 13a...Outgoing pipe, 13b...
...Return pipe, 14...Suction port, 15...Discharge port, 1
8... Cylinder, 19... Outlet.

Claims (1)

[Scope of utility model registration request] The heat collector and the open hot water storage tank with a gap above the water surface for water to fall are connected by an outgoing pipe with a circulation pump and a return pipe with an air release valve at the top, and the inlet of the outgoing pipe is connected. The outlet of the return pipe is opened at the upper part of the hot water storage tank, and the discharge port of the return pipe is opened below the suction port, and the hot water supply pipe is branched from the downstream position of the circulation pump of the above-mentioned outgoing pipe, and the outgoing pipe downstream of this branch point is connected to the outgoing pipe when hot water is being supplied. In the device provided with a solenoid valve that is closed, the return pipe is arranged downward in the hot water storage tank, and the return pipe is surrounded by a cylinder whose upper end is opened in the gap above the water surface,
A solar hot water supply device characterized in that an outlet is provided below the outlet of the cylindrical body.