JPH0126350Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention supplies water from a water storage tank to a hot water tank,
The present invention relates to a hot water supply device that extracts hot water heated by a heating device provided in the hot water supply tank from an extraction pipe, and particularly relates to an overflow of a water storage tank and an air vent structure of the hot water supply tank.

(b) Conventional technology Conventionally, this type of water heater has a hot water tank with high temperature,
An air bleed pipe is installed to prevent high-pressure air from accumulating, and an overflow pipe is installed to prevent water from overflowing into the water storage tank, but these pipes have completely different purposes and are installed separately. It is common that Japanese Utility Model Publication No. 49-38931 discloses a technique to simplify the structure by using both the air vent pipe and the overflow pipe. The hot water was received by the hot water tank via the dual-purpose pipe, which had an adverse effect on the hot water in the hot water tank, making it impossible to take full advantage of the advantage of simplifying the structure.

(c) Purpose of the invention The present invention provides a hot water supply device in which the overflow pipe of the water storage tank and the air vent pipe of the hot water tank are simply constructed in a space-saving manner, and also prevents any adverse effects on the hot water in the hot water tank.

(d) Structure of the invention This invention supplies water from a water storage tank to a hot water tank located at a distance below the tank, and supplies hot water heated by a heating device provided in the hot water tank from an extraction pipe connected to the hot water tank. In the hot water supply device configured to extract hot water, an overflow pipe is installed upward from the bottom of the water storage tank, and an overflow pipe protrudes from the top of the hot water tank and inserted into the overflow pipe, and is arranged at a distance from the pipe. This hot water supply device is provided with an air vent pipe and a heat-resistant sealing member that liquid-tightly seals the gap at the upper ends of the overflow pipe and the air vent pipe.

(E) Fig. 1 shows a coffee boiler implementing the water heater of the present invention, in which a hot water tank 4 equipped with a heater 2, a hot water temperature control thermostat 3, etc. is disposed inside the main body 1, and A water storage tank 5 having an open top surface 5A is arranged above the tank 4 and spaced apart from the tank 4. One end of the water storage tank 5 is connected to a water source, and the other end of a water supply pipe 7 equipped with a water supply valve 6 is exposed in the middle, and a water extraction valve 8 is interposed between the lower part of the water storage tank 5 and the bottom of the hot water tank 4. The hot water supply tank 4 is connected to the hot water supply tank 4 by an extraction pipe 9, and is further provided with an extraction pipe 10 above the hot water supply tank 4 for extracting hot water from the hot water supply tank 4 using a siphon effect. This extraction tube 1
A spray head 11 is attached to the tip of the cup 0, and a chamber 13 in which coffee powder 12 is set is provided opposite the spray head 11 so as to be freely drawn out. Further, the first liquid level detection device 14 provided in the water storage tank 5 controls the water supply valve 6 so as to maintain the water level in the tank 5 at a predetermined water level, and controls the cylindrical pipe 15 provided in the hot water tank 4. A second liquid level detection device 16, which is disposed inside and detects two levels, upper and lower, controls the water extraction valve 8.

Therefore, an overflow pipe 17 is installed from the bottom of the water storage tank 5 to a position whose upper end is higher than the liquid level controlled by the first liquid level detection device 14 and lower than the top opening 5A of the water storage tank 5 . On the other hand, an overflow pipe 17 is located at the top of the hot water tank 4.
An air bleed pipe 19 is formed to protrude and be inserted into the overflow pipe 17 with a gap 18 therebetween. A cap 20 is welded to the upper end of the overflow pipe 17, and the cap 20 enters into the air vent pipe 19 when the air vent pipe 19 is inserted into the overflow pipe 17. The gap 18 between the overflow pipe 17 and the air vent pipe 19 is It is liquid-tightly sealed by a heat-resistant rubber gasket 21 that is pressed by a heat resistant rubber gasket 21.

Due to the relationship between the overflow pipe 17 and the air bleed pipe 19 as described above, overflow water in the event of an abnormality is collected into the hot water tank 4 through the air bleed pipe 19 as shown by arrow A, and the high temperature in the upper part of the hot water tank 4 is recovered. The air and steam are removed from the air vent pipe 19 as shown by arrow B.
The hot water in the hot water supply tank 4 is reliably prevented from being adversely affected by the cold water in the water storage tank 5 in terms of heat conduction.

Furthermore, according to the connection relationship between the overflow pipe 17 and the air vent pipe 19 of the present invention, the hot water tank 4 and the water storage tank 5 can be easily separated, and maintenance serviceability can also be improved.

(f) Effects of the invention As described above, this invention allows water overflowing from the overflow pipe to be collected into the water storage tank through the air vent pipe, thereby reliably eliminating the worst-case situation where the inside of the aircraft is flooded with water. be able to. In addition, the overflow pipe of the water storage tank and the air bleed pipe of the hot water tank can be configured simply and in an extremely small space, and the assembly work is easy, as well as preventing adverse effects of thermal conduction on the hot water in the hot water tank. This also has the advantage of being able to prevent the temperature of hot water from decreasing.

[Brief explanation of the drawing]

FIG. 1 is a schematic internal view showing an embodiment of the water heater of the present invention, and FIG. 2 is an enlarged sectional view of the main parts. 4...Hot water tank, 5 ...Water storage tank, 17...
...overflow pipe, 18...interval, 19...air bleed pipe, 20...cap, 21...packet.

Claims (1)

[Scope of utility model registration request] In a hot water supply device configured to supply water from a water storage tank to a hot water tank spaced apart below the tank, and to extract hot water heated by a heating device provided in the hot water tank from an extraction pipe connected to the hot water tank. an overflow pipe that stands upward from the bottom of the water storage tank; an air vent pipe that protrudes from the top of the hot water tank and is inserted into the overflow pipe and is spaced apart from the pipe; A water heater comprising a heat-resistant sealing member that seals liquid-tightly at the upper ends of an overflow pipe and an air vent pipe.