JP2513095Y2 - Hot water temperature drop prevention device in hot water storage tank of natural circulation type solar water heater - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water temperature lowering prevention device in a hot water storage tank of a natural circulation type solar water heater.

[0002]

2. Description of the Related Art In a hot water storage tank (hereinafter referred to as a tank) of a natural circulation type solar water heater (hereinafter referred to as a water heater), the water level constantly changes due to hot water supply or water supply. Therefore, in order to smoothly perform the fluctuation of the water level, it is necessary to always keep the pressure of the air layer in the tank constant (atmospheric pressure is preferable). However, conventionally, a simple structure in which an air intake and exhaust port is simply provided in the air layer has been used (for example, Japanese Utility Model Laid-Open No. 51-134241).

[0003]

[Problems to be Solved by the Invention] In this case, the energy of the solar heat stored with a great deal of effort is constantly radiated from the intake and exhaust ports, which is very inefficient. The present invention solves such a problem, and in short, by utilizing the principle of the thermos, the temperature of the hot water that allows only intake and exhaust while keeping the inside of the tank and the outside air off at all times. The present invention provides a deterioration prevention device.

[0004]

[Means for Solving the Problems] Under the above problems, the present invention is directed to a lateral outside air side end of an intake / exhaust pipe that communicates the outside air with a space above the maximum hot water surface in a hot water tank of a natural circulation solar water heater. A device for preventing lowering of hot water temperature provided in a guide hole formed in a portion, wherein the device for preventing lowering hot water temperature includes an outer opening lid for opening and closing the conducting hole and an inner opening for opening and closing a vent hole formed in the outer opening lid. Of these, the outer cover is biased toward the hot water storage tank side to close the guide hole, and due to the pressure increase in the hot water storage tank, it moves to the outside air side to open the guide hole. The air in the hot water storage tank is released to the outside, and a ventilation hole is formed in part of it, and the outside air side of this ventilation hole is surrounded by a cap with a downward ventilation hole on the lower surface. Is attached to the hot water tank side of the outer lid and is urged to the outside air side to vent Hot water storage for a natural circulation solar water heater, which is closed and moves toward the hot water storage tank side due to pressure drop in the hot water storage tank to open a ventilation hole, and sucks outside air into the hot water storage tank through the downward ventilation hole. An apparatus for preventing a decrease in hot water temperature in a bath is provided.

[0005]

[Advantages] By taking the above means, when water is supplied, the lightly closed outer opening lid is opened and exhausted by the rise in pressure in the sealed tank due to the rise in water level.
Due to the pressure drop in the tank due to the drop of the water level, the lightly closed inner lid is opened and air is taken. However, in other cases, both lids are closed to prevent heat dissipation. Further, even when the bolt-up mechanism for controlling the water level fails and the water level becomes abnormally high, the outer lid opens to allow drainage. In this case, since the vent hole formed in the outer lid is surrounded by the cap, dust and water causing freezing are prevented from entering here, and malfunction of the inner lid is prevented. In addition, since the wind and the like are prevented from directly hitting the inward opening lid, this also prevents malfunction. Furthermore, this cap also serves as a weight for urging the outer lid toward the hot water storage tank.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 is a partial cross-sectional view of the tank of the water heater.
Is a heat insulating material (outer wall) for the outer surface placed on the heat receiving plate 12.
It is a sealed container wrapped with 14. A water supply pipe 16 connected to a water source is introduced into the tank 10. The water supply pipe 16 is provided with a bolt-up mechanism 18 that detects the water level and opens and closes the valve. When the water level becomes high, the water supply is stopped,
Water supply starts when the water level becomes low. In addition to this, a hot water take-out pipe 20 is also introduced into the tank 10, and heated hot water is taken out from this and used.

An intake / exhaust pipe 22 is also provided in the upper space of the tank 10, the upper end of which faces the space above the highest water level in the tank 10, and the lower end thereof penetrates the outer wall 14 and projects to the outside. . The intake / exhaust pipe 22 is for intake / exhaust of the air in the tank 10 (also drains when the water level becomes excessive) to keep its pressure constant. The hot water temperature lowering prevention device 24 is provided at the end.

FIG. 1 is a vertical sectional view of a hot water temperature lowering preventive device 24 showing an embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. 3 is B.
Although it is a view from the arrow, a hole is opened in the outer wall 14 at an appropriate position of the tank 10,
A ring 28 in which a multi-step guide hole 26 having a smaller diameter toward the inside is fitted is fitted into this, and this and the intake / exhaust pipe 22 are connected by screwing or the like. A packing 30 or the like for sealing is interposed at a connecting portion between the intake / exhaust pipe 22 and the ring 28.

The ring 28 has an outer lid 32 that opens outward to allow air (water) in the tank 10 to be exhausted (drained) to the outside.
And an inward opening lid 34 that can be opened inward to suck the outside air into the tank 10. The outer lid 32 is a disk body that closes the guide hole 26, and a horizontal support shaft 36 provided on the ring 28.
It is designed such that the circumference of can be rotated only to the outside air side (counterclockwise direction in FIG. 1). On the outside air side of the outer lid 32, a cap 38 is attached also as a weight so as to surround a later-described vent hole 40 formed therein.

As described above, the outer lid 32 is provided with the cap 3
The guide hole 2 is provided by the weight action of the eccentric 8 toward the outside air.
6 is biased toward the tank 10 side to cover the tank.
This state is maintained as long as the inside pressure is normal. However, when the pressure in the tank 10 rises or the water level increases and overflows to the intake / exhaust pipe 22, the pressing force is applied to the tank 10 of the outer lid 32.
Side urging force, the outer opening lid 32 is rotated toward the outside air side, and the air (water) in the tank 10 is exhausted (drained) to the outside.

On the other hand, the inner lid 34 is the outer lid 3
It is a disk body that closes the vent hole 40 formed in 2 from the tank 10 side, and can be rotated only around the tank 10 side (clockwise direction in FIG. 1) around the horizontal support shaft 42 provided in the outer lid 32. It is one that has become. A weight 44 is attached to the tank 10 side of the inner lid 34.

As a result, the inner opening lid 34 is attached to the weight 4
4 is biased to the outside air side with respect to the ventilation hole 40 by the weight action eccentric to the tank 10 side to cover the tank 1.
This state is maintained as long as the inside of 0 is the normal pressure. However, when the pressure in the tank 10 decreases, the suction force overcomes the urging force of the inner opening lid 34 on the outside air side, the inner opening lid 34 is rotated to the tank 10 side, and the outside air is formed on the lower surface of the cap 38. Air is sucked into the tank 10 through the downward ventilation hole 46 and the ventilation hole 40 formed in the outer lid 32.

The positions and weights of the cap 38 of the outer lid 32 and the weight 44 of the inner lid 34 are set so that such an operation can be performed smoothly. A spring may be used instead of the weight, or both may be used in combination. In addition, a cover 48 is provided at the opening end of the ring 28 to prevent the outer lid 32 or the like from malfunctioning due to the influence of wind or from freezing and causing malfunction.

In the above-described hot water temperature lowering prevention device 24, the intake / exhaust pipe 22 is projected to the outside of the outer wall 14 near the bottom of the tank 10 to serve as the outside air side end portion, which is provided integrally with the tank 10. The structure is preferable, but in some cases, the intake / exhaust pipe 22 may be extended to near the ground and attached there. This has the advantage of facilitating maintenance and the like.

[0015]

As described above, according to the present invention, a kind of open / close valve is attached to the intake / exhaust pipe that connects the tank with the outside air, and opens only when intake / exhaust is required due to increase / decrease in pressure in the tank. Since it is closed at all times, the thermal energy stored in the tank does not escape to the outside, resulting in an excellent heat loss. In this case, since the vent hole formed in the outer lid is surrounded by the cap, dust and water causing freezing are prevented from entering here,
Prevents malfunction of the inner cover. In addition, since the wind and the like are prevented from directly hitting the inward opening lid, this also prevents malfunction. Furthermore, since this cap also serves as a weight for urging the outer lid toward the hot water storage tank side, the parts can be omitted and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a hot water temperature lowering prevention device in a hot water storage tank of a natural circulation solar water heater showing an embodiment of the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is a view on arrow B of FIG.

FIG. 4 is a partial cross-sectional view of a hot water storage tank of a natural circulation solar water heater showing an embodiment of the present invention.

[Explanation of symbols]

 10 Hot Water Storage Tank 22 Intake / Exhaust Pipe 24 Hot Water Temperature Preventing Device 26 Guide Hole 32 Outer Opening Lid 34 Inner Opening Lid 38 Cap 40 Venting Hole 46 Downward Venting Hole

Claims (3)

(57) [Scope of utility model registration request] 1. A hot water temperature reduction prevention provided in a guide hole formed at an end portion of the intake / exhaust pipe that laterally communicates the space above the maximum hot water surface in the hot water tank of the natural circulation solar water heater with the outside air. This device is a device for preventing decrease in hot water temperature, which comprises an outer opening lid that opens and closes a guide hole, and an inner opening lid that opens and closes a ventilation hole formed in the outer opening. The outer opening lid is biased toward the hot water storage tank side to close the guide hole, and moves to the outside air side due to the pressure increase in the hot water storage tank to open the guide hole, allowing the air in the hot water storage tank to escape to the outside. A ventilation hole is formed in the part, and the outside air side of this ventilation hole is surrounded by a cap with a downward ventilation hole formed on the lower surface.The inner opening lid is attached to the hot water tank side of the outer opening lid, The ventilation hole is closed by being urged to the A hot water temperature lowering prevention device in a hot water storage tank of a natural circulation solar water heater, which moves to a hot water tank side to open a ventilation hole, and sucks outside air into the hot water storage tank through a downward ventilation hole. 2. The outside air side end of the intake / exhaust pipe is located outside the outer wall near the bottom of the hot water storage tank.
Device for preventing water temperature drop in hot water storage tank of natural circulation type solar water heater. 3. The hot water temperature lowering preventive device for a hot water storage tank of a natural circulation solar water heater according to claim 1, wherein the outside air side end portion of the intake and exhaust pipe is extended to near the ground.