JPH0343566Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a natural circulation type solar water heater, and more specifically, to a water draining means for draining water from the hot water outlet pipe in order to prevent the pipe from bursting due to freezing.

Solar water heaters can be used even in winter as long as snow does not accumulate on the collector, but it is necessary to prevent pipes from bursting due to freezing. Various methods are known to prevent freezing, but generally water is drained.
A conventional example thereof is shown in FIGS. 5 and 6. That is, in the one shown in FIG. 5, the hot water outlet 2 is provided at the bottom of the hot water storage tank 1, and the hot water outlet pipe 3 is connected to that part.
An air introduction pipe 4 extending above the water level of the hot water storage tank 1 when the water is full is connected to the hot water tap 3, and a solenoid valve 5 is interposed between the hot water tap 2 and the hot water tap 3. Therefore, water is drained from the hot water tap 3 by closing the electromagnetic valve 5 and opening the faucet 6 of the hot water tap 3, but this method has several drawbacks. In other words, the cost of the solenoid valve is high;
Moreover, wiring work is required. Furthermore, there is a risk of malfunction due to adhesion of water scale, etc., and furthermore, there is a risk that residual water in the tap hole and the solenoid valve may freeze.
On the other hand, as shown in FIG. 6, the end of the hot water tap 3 is raised up to a predetermined height in the hot water storage tank 1, or the end of the hot water tap 3 is There is an overflow type in which the hot water tank 1 is provided at the upper side wall of the tank 1. According to this, a solenoid valve or the like is not required, and by closing the tap of the water supply pipe (not shown) and opening the faucet 6 of the hot water outlet pipe 3, the hot water outlet pipe 3
On the other hand, on the other hand,
There is a lot of wasteful loss of hot water, and the amount of hot water stored after draining the hot water pipe 3 decreases, so the temperature of hot water at night drops significantly. Another disadvantage is that hot water cannot be accessed without turning off the water supply.

This idea was created in view of the above-mentioned drawbacks of the conventional technology, and its purpose is to provide a water draining means that can reliably drain water from the hot water pipe without wasting the hot water in the hot water storage tank. Our objective is to provide solar water heaters with the following advantages:

Hereinafter, this invention will be described in detail with reference to embodiments shown in the accompanying drawings.

Referring to FIG. 1, this solar water heater has a heat collector 1 having a heat collecting element such as a heat pipe.
0, and a hot water storage tank 11 connected to the upper end of the heat collector 10, and the hot water storage tank 11 has a water supply pipe 1.
2 and a hot water outlet pipe 13 are connected. In this embodiment, a water intake pipe 16 is connected to one end of the hot water outlet pipe 13 via a T-shaped pipe joint 15, and this water intake pipe 16 is connected to a pipe inserted into the upper wall of the hot water storage tank 11. It is introduced into the tank through the hole 14 so as to form a siphon. However, as illustrated in FIG.
The water intake pipe 16 may be introduced into the tank through a hole in the side wall of the hot water storage tank 1.
When the water level in the hot water tank 1 when full is L, the pipe insertion hole 14 must be bored at a position above the water level L, and the water intake pipe 16 must be guided into the hot water storage tank 11 from that position. In the above embodiment, the water intake pipe 16 is connected to the hot water outlet pipe 13 via the pipe joint 15, but one end of the hot water outlet pipe 13 is directly connected to the hot water storage tank 1.
In this sense, it should be understood that the water intake pipe 16 substantially forms a part of the hot water outlet pipe 13.

According to this invention, an air introduction pipe 17 for draining water is arranged in parallel to the hot water outlet pipe 13.
One end thereof is connected to the hot water tap pipe 13, and in this case, the connection point is selected to be a piping portion above the water surface L of the hot water tap pipe 13, and in this embodiment, the pipe joint 15 is connected to the hot water tap pipe 13. Through the outlet pipe 13
I am trying to connect to. On the other hand, a cock 18 is attached to the other end of the air introduction pipe 17.

Further, a known faucet 19 is attached to the other end of the hot water tap 13, and a manual suction pump 20, for example, is connected to the downstream side thereof.
This suction pump 20 may be of a known type, and for example, as shown in FIG. 22, and a second check valve 26 provided in a pipe 25 branched downstream of the first check valve 24. These check valves 24 and 26 alternately open and close in response to changes in the volume of the air chamber 22.

The water supply pipe 12 is introduced into the upper part of the hot water storage tank 11, and a ball tap 27 is attached to the end thereof. In addition, this water supply pipe 12
A drain pipe 29 having a faucet 28 is provided at a predetermined location of the
is connected. Therefore, water is supplied to the hot water tank 11 by closing the faucet 28 and opening the faucet 30 on the water pipe side, and when the water level reaches the predetermined full water level L, the ball tap 27 is opened.
operates and water supply is stopped.

In the above configuration, when hot water is to be supplied, the pot 18 is closed, the faucet 19 is opened, and the suction pump 20 is operated repeatedly. As a result, the pressure inside the hot water outlet pipe 13 gradually decreases, so the hot water storage tank 11
The hot water inside is sucked up through the water intake pipe 16, and a siphon effect is finally generated, whereby the hot water naturally flows out through the hot water outlet pipe 13. In this way, hot water can be supplied whenever needed by simply opening and closing the faucet 19.

On the other hand, in order to drain water from the hot water tap pipe 13, both the pot 18 and the faucet 19 may be opened. That is, by opening the pot 18, air enters the hot water outlet pipe 13 from the air introduction pipe 17 and the siphon collapses, so the hot water in the hot water outlet pipe 13 is pulled by gravity at the pipe joint 15. At the same time, water flows out from the faucet 19 and the water intake pipe 16
The hot water inside will be returned to the hot water storage tank 11.
Note that in order to drain the water from the water supply pipe 12, the water faucet 30 may be closed and the water faucet 28 may be opened.

FIG. 4 shows another embodiment of this invention. That is, in this embodiment, a pipe 33 having a faucet 32 is connected between a water supply pipe 31 and a hot water outlet pipe 13, and in order to supply hot water, a water tap 1 is required.
8 and the faucet 19 are closed, the water faucet 32 is opened, and priming water is supplied from the water pipe 31 to the hot water outlet pipe 13 via the pipe 33. As a result, the air in the hot water tap pipe 13 is pushed out from the pipe end of the water intake pipe 16 into the hot water storage tank 16, and the hot water tap pipe 13 is filled with priming water. Then, when the faucet 32 is closed and the faucet 19 is opened, the hot water in the hot water tank 11 flows out due to the siphon action. On the other hand, in order to drain the water inside the hot water tap pipe 13, it is sufficient to open both the pot 18 and the faucet 19 as in the above embodiment.

As is clear from the above description of the embodiments, this invention eliminates the need for expensive parts such as electromagnetic valves and the associated wiring work, resulting in great cost benefits. In addition, only the water in the hot water tap can be drained without wasting hot water when the water is full. Therefore, the heat retention performance at night is good, and heat can be collected for two days even with low solar radiation in winter, making reheating unnecessary.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing an embodiment of the solar water heater according to this invention, Fig. 2 is a sectional view of the main parts showing a state in which the hot water outlet pipe is connected to the hot water storage tank in a manner different from Fig. 1, and Fig. 3 is a schematic sectional view of the manual suction pump shown in FIG. 1, FIG. 4 is a schematic diagram showing another embodiment of this invention, and FIGS. 5 and 6.
Each figure is a schematic diagram showing a conventional example.

Claims (1)

[Claims for Utility Model Registration] (1) Includes a heat collector 10 and a hot water storage tank 11 connected to the heat collector 10, and a water supply pipe 12 connected to the hot water storage tank 11.
and a natural circulation type solar water heater in which a hot water tap pipe 13 is connected, wherein the hot water storage tank 11 has a pipe insertion hole 14 for the hot water tap pipe 13 formed above the water level L when the water is full; One end of the hot water outlet pipe 13 is introduced through the pipe insertion hole 14 so as to be submerged below the water surface in the hot water storage tank 11 to form a siphon, and is located above the water level L of the hot water outlet pipe 13 when the water is full. The other end of the draining air introduction pipe 17 having a tap 18 at one end is connected to the piping section located at , and a faucet 19 is provided at the other end of the hot water tap 13. solar water heater. (2) The solar water heater according to claim 1, wherein a suction pump 20 that produces a siphon effect is provided in a pipe section before or after the faucet 19. (3) The solar water heater according to claim 1, wherein a piping 33 for supplying priming water is connected to a portion of the pipe in front of the faucet 19.