JPH09126558A - Natural circulation solar heat warm water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent temperature from being lowered during hot water supply by preventing water from being supplied anew to a solar heat warm water heater body until it is detected by a detection means that the amount of water storage in the solar heat warm water heater body is a predetermined amount. SOLUTION: When a level detector 24 detects a predetermined low level, water is automatically supplied through a three-way valve 12. Hot water is supplied from a solar heat warm water heater body 11, and water supply is started after the elapse of a predetermined time since the hot water supply, and further the water supply is continued until a water level sensor 24 detects a predetermined high level. In contrast, after the water supply is once started, heated hot water is supplied through the three-way valve 12 via a hot water supply piping 17 until the water sensor 24 detects a predetermined low level. Water supply is not performed anew until the amount of hot water stored in a heat storage tank 13 becomes a predetermined value or lower after the water supply is once started in such a manner, so that heated hot water and supply water are prevented from being mixed unlike the prior art. Accordingly, temperature is prevented from being lowered during the hot water supply.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a natural circulation solar water heater, and more particularly to a natural circulation solar water heater in which new feed water and heated hot water do not mix.

[0002]

2. Description of the Related Art FIG. 5 is a schematic view showing a structure of a solar water heater body used in a conventional natural circulation solar water heater. With reference to FIG. 5, the conventional solar water heater main body is provided in the heat storage tank 31, the partition wall 32 that divides the water supply section 41 and the hot water supply section 42 of the heat storage tank 31, and the water supply section 41. Ball tap valve 33 for supplying, and tapping part 4
2, and a float 36 for sucking heated hot water. The ball tap valve 33 automatically supplies water when the level on the water supply side falls below a predetermined value, and the supplied water is sent to the hot water outlet 42 on the left side through the opening at the bottom of the partition wall 32.

[0003]

The solar water heater main body of the conventional natural circulation type solar water heater has the above-mentioned structure. The partition wall 32 is configured so that new water supply and heated hot water do not mix, but in reality, the heat storage tank 3
When the residual hot water amount of 1 decreases, the newly supplied water and the heated hot water may be mixed and sent from the hot water outlet 35 to the water heater side through the float 36. As a result, users who use hot water from the water heater may be dissatisfied with being hot only at the beginning and quickly becoming lukewarm.

Further, in the case of the conventional natural circulation type solar water heater, if the amount of hot water discharged from the main body of the solar water heater is larger than the amount of water supplied to the solar water heater at the time of hot water discharge, the water supply cannot keep up with the hot water and air is discharged from the hot water outlet 35. I will inhale. As a result, when air is sucked into the pipe, "air bleeding" occurs and the amount of hot water discharged is extremely reduced, or the hot water itself cannot be discharged unless the air in the pipe is removed by some method. There was a point.

The present invention has been made to solve the above problems, and an object thereof is to provide a natural circulation type solar water heater in which the temperature does not drop during hot water supply.

Another object of the present invention is to eliminate "air blemishes" in a natural circulation solar water heater.

[0007]

A natural circulation solar water heater according to the present invention is a solar water heater body, a means for detecting a predetermined amount of water stored in the solar water heater body, and a detector for detecting a predetermined amount. Up to the means for not supplying new water to the body of the solar water heater.

Since new water is not supplied until the amount of water stored in the solar water heater body reaches a predetermined amount, the heated hot water and the newly supplied water do not mix. As a result, it is possible to provide a natural circulation solar water heater in which the temperature does not drop during hot water supply.

Further, when the time difference water supply system as described above is used, the hot water supply circuit is switched before the remaining amount of the heat storage tank is detected and the air is sucked into the pipe.
It is possible to provide a natural circulation type solar water heater that can eliminate the problem.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing the overall configuration of a natural circulation solar water heater 10 according to the present invention. Referring to FIG. 1, a natural circulation solar water heater 10 includes a solar water heater body 11, a hot water supply pipe 14 for tapping hot water heated by the solar water heater body 11, and water supply for supplying tap water. It includes a three-way valve 12 connected to the pipe 15 for sending heated hot water or water to the solar water heater main body 11, respectively. The three-way valve 12 discharges hot water or water sent from either the hot water supply pipe 14 or the water supply pipe 15 or sends it to the solar water heater body 11.

FIG. 2 shows the solar water heater body 11 shown in FIG.
It is a schematic diagram which shows the internal structure of. With reference to FIG. 2, the solar water heater body 11 includes a heat storage tank 13, a heat collecting plate 23, a water supply port 21 for supplying water to the heat storage tank 13 via a water supply pipe 16, and a heat storage tank 13. Hot water outlet pipe 1
And a tap hole 22 for tapping the water through the nozzle 4. A level detector 24 for detecting the amount of water or hot water stored in the heat storage tank 13 is provided near the hot water outlet 22 below the heat storage tank 13 of the solar water heater body 11. The level detector 24 is, for example, a pressure detection type level meter, and when a predetermined pressure is detected, a predetermined signal is sent to the three-way valve 12, whereby the three-way valve 12 performs the following operation.

That is, when the level detector 24 detects a predetermined low level (indicated by B in FIG. 2), the three-way valve 12 is set in the direction shown in FIG. 1 and water is automatically supplied. Hot water is discharged from the solar water heater body 11, water supply is started when a certain time has elapsed after the hot water was discharged, and the water supply is continued until the water level sensor 24 detects a predetermined high level (indicated by A in FIG. 2).

On the other hand, after water is once supplied, the three-way valve 12 is set in the direction shown by the arrow in FIG. 1 until the water level sensor 24 detects the above-mentioned predetermined low level, and heated hot water is discharged. Hot water is discharged through the pipe 17. In this way, once water supply is completed, new water supply is not performed until the amount of hot water stored in the heat storage tank 13 becomes equal to or less than the predetermined value, so heated water and water supply do not mix as in the conventional case. .

In the above embodiment, the case where the water level is automatically adjusted has been described, but the present invention is not limited to this, and water supply to the solar water heater body 11 may be manually performed using the remote controller 25, for example. Good. The remote controller 25 is attached at an arbitrary position near the solar water heater and is connected to a predetermined device wirelessly or by wire.

FIG. 3 is a schematic diagram showing the display section of the remote controller 25. With reference to FIG. 3, the remote controller 25 includes a heat storage tank temperature display unit 26, a remaining hot water amount display unit 27, and a drain switch 28.
And a water supply state display section 29 showing a water supply state to the solar water heater body 11 and a water supply switch 30. The user of the solar water heater can manually switch the water supply to the solar water heater main body 11 by referring to the above-mentioned respective displays of the remote controller 25.

If it is desired to supply water before the remaining hot water amount reaches the set value for starting water supply (indicated by B in FIG. 2), the remote controller 2
Water can also be supplied manually by operating the switch of No. 5.
The water supply can be stopped by operating the water supply switch 30, but when this operation is not performed, the water is supplied until the full storage of the heat storage tank 13 is detected as in the automatic case.
Further, even when the water supply is stopped manually, the water supply may be restarted in the same manner as in the automatic case.

In the solar water heater, it is necessary to drain water from the body of the solar water heater when antifreezing and when the body of the solar water heater is not used for a long time. In such a case, the three-way valve 12 is set as shown by the arrow by depressing the water drain switch 28 of the remote controller 25 shown in FIG. 3, and the hot water supply side valve 20 provided in the hot water supply pipe 19 is provided.
Can be opened to drain water. At this time, the heat storage tank 13
The drop in the water level in Iran will be ignored and will take precedence over all functions. This drainage function can be released by depressing the drainage switch 28 again.

Next, the remaining hot water amount display section 27 of the remote controller 25 will be described. FIG. 4 (A) is a view showing a cross section in the longitudinal direction of the heat storage tank 13, and FIG. 4 (B) is a view showing a time course of display of the remaining hot water amount display unit 27. The cross section of the heat storage tank 13 is shown in FIG.
Since it has a shape as shown in FIG.
4 is displayed on the remaining hot water amount display unit 27 as it is.
The time course shown by the solid line a in (B) is followed. This is not clear how much the amount of remaining hot water in the heat storage tank 13 is decreasing. Therefore, the remaining hot water amount display unit 27 of the remote controller 25 according to the present invention has a built-in microcomputer for displaying the remaining hot water amount as represented by the straight line indicated by b in FIG. 4 (B). This allows the amount of remaining hot water in the heat storage tank 13 to be clearly understood.

In the above embodiment, the liquid level control was explained for the solar water heater main body using the ball tap valve, but the present invention is not limited to this, and it is applicable to the one using the electrode type liquid level controller. Needless to say. Furthermore, although the above-described embodiment describes the natural circulation type solar water heater, it may be applied to a forced circulation type solar water heater.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an overall configuration of a solar water heater according to the present invention.

FIG. 2 is a schematic diagram showing a configuration of a solar water heater body to which the present invention is applied.

FIG. 3 is a diagram showing a display section and an operation section of a remote control device used in the solar water heater according to the present invention.

FIG. 4 is a view showing a longitudinal cross section of the heat storage tank and a display state of the amount of remaining hot water.

FIG. 5 is a schematic diagram showing a configuration of a conventional solar water heater body.

[Explanation of symbols]

 10 Natural circulation type solar water heater 11 Solar water heater main body 12 Three-way valve 13 Heat storage tank 14,17 Hot water supply pipe 15,16 Water supply pipe 24 Water level sensor 25 Remote control

Claims (1)

[Claims] 1. A solar water heater main body, means for detecting that the amount of stored water in the solar water heater main body is a predetermined amount, and a new heater for the solar water heater main body until the detecting means detects the predetermined amount. Natural circulation solar water heater, including means for not supplying water.