JPH0739872B2 - Hot water circulation device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hot water device that circulates hot water heated by a kettle under vapor pressure without using a circulation pump.

[Conventional technology]

There is a coffee siphon as one of the methods for boiling coffee, but when this coffee siphon boils, the water in the lower pot is pushed up by the steam pressure and the lower pot becomes only steam, and the burner When the temperature is stopped by lowering the temperature, the water vapor in the lower pot is liquefied and a negative pressure is generated, and the pushed up water is sucked into the lower pot again and becomes hot water boiled coffee and descends. is there. Using this principle, a hot water device that pumps hot water that has been heated in a conventional kettle under steam pressure, radiatively cools it with a radiator (fan coil unit, floor mat, etc.) and then returns the water to the kettle is established as a theoretical theory. However, in an experiment, when the water in the kettle became empty, the water sent to the kettle immediately boiled, and the pressure of the large amount of water vapor generated in the kettle hindered the return from the radiator to the open tank. There is a drawback that water is difficult to enter the kettle, and in order to solve this problem, the applicant has filed Japanese Patent Application No. 55-97.
He has made many proposals, including 966 (Japanese Patent Publication No. 63-15492).

[Problems to be solved by the invention]

By the way, the timing to open the valve to send the water returned to the open tank to the kettle is slightly deviated, and a large amount of water vapor is generated at the moment the water flows into the kettle, causing an airlock and stopping the circulation cycle. For example, when a simple valve such as a check valve is used for timing, the temperature of each part and the conditions of the piping may be slightly different, and the circulating cycle may suddenly stop during operation.

[Means for solving problems]

The present invention makes it possible to supply water from the open tank to the water boiling can even when the valve opening timing is a little misaligned with respect to the operating conditions of the device and the water flowing into the water boiling can begins to boil. Is. The configuration will be described below with reference to the drawings showing the embodiments.

Numeral 1 is an open tank, which has a passage on one side that communicates with the atmosphere.
Reference numeral 2 is a kettle provided at a position lower than the open tank 1, 3 is a radiator to which hot water of the kettle 2 is sent, and the open tank 1, the kettle 2 and the radiator 3 are circulated through the circulation pipes 4, 4 ', 4 ". The circulation pipe 4 extends from the bottom of the open tank 1 and is connected to the kettle 2 via a check valve 5 provided in the middle of the open tank 1. Also, the circulation pipe connecting the bottom of the kettle 2 and the radiator 3 is connected. Pipe 4'branches the side of the kettle 2 and attaches the connecting pipe 6,
The end of the connecting pipe 6 is connected to the open tank 1. Reference numeral 5'denotes a first check valve mounted in the middle of the connecting pipe 6. Reference numeral 5 ″ is a second check valve mounted in the middle of the circulation pipe 4 ″ that connects the radiator 3 and the open tank 1. The check valve 5 flows from the kettle 2 to the open tank 1, the first check valve 5'flows from the circulation pipe 4'to the open tank 1, and the second check valve 5 "flows from the open tank 1. Stop the flow to the radiator 3.

A burner 7 heats the kettle 2, and the heat source may be gas, oil, or electricity. Reference numeral 8 is a water temperature sensor provided between the first check valve 5'of the connecting pipe 6 and the open tank 1. When hot water starts to circulate after the start, the water in the open tank 1 flows into the connecting pipe 6, so this temperature Is detected by the water temperature sensor 8 to switch the combustion amount of the burner 7 between large and small. The water temperature sensor 8 has the same function even if it is attached to the circulation pipe 4 between the check valve 5 and the open tank 1. Reference numeral 9 is a high limit switch provided on the side of the circulating water pipe 2 of the circulation pipe 4 ', and since this circulation pipe 4'communicates with the hot water outlet of the boiling water canister 2, even if the Manichi boiling water canister 2 becomes empty and the circulation cycle is stopped. It is for detecting this and stopping the combustion of the burner 7. Reference numeral 10 denotes a water supply tank which is connected to the open tank 1 via a water supply pipe 11 and an air supply pipe 12, and has a water injection port 10 '.
A cap 13 that also serves as a vent to the atmosphere is provided at the 0'portion.

[Explanation of action]

The present invention having the structure shown in the above embodiment is a water supply cap.
Open 13 and supply water with an appropriate water can to supply water to the water tank 10.
Water is supplied to the open tank 1 through the water supply pipe 11. The supplied water flows from the open tank 1 to the circulation pipes 4, 4 ', 4 ",
They are housed in the water heater 2, the radiator 3 and the connecting pipe 6, respectively.
However, when the burner 7 is ignited and the kettle 2 is heated, the water in the kettle 2 begins to boil and the steam generated raises the pressure in the kettle 2, and the check valve 5 is closed by this pressure and hot water is circulated in the circulation pipe 4 '. Is sent to the radiator 3 to become cold water and returned to the open tank 1. When all the water in the kettle 2 is extruded, the generation of water vapor in the water kettle 2 stops and the pressure drops, and the remaining water vapor is liquefied by the low-temperature circulation pipe 4'and the radiator 3, so that the open tank 1 For water, open the check valve 5 and open the kettle 2
To cool the kettle 2 and liquefy the water vapor, a strong negative pressure is generated and the water in the open tank 1 is sucked. Since the burner 7 continues to burn, it heats the kettle 2 and sends hot water to the radiator 3 again.

In the present invention, since the circulation pipe 4'at the hot water outlet of the hot water can 2 and the open tank 1 are connected by the communication pipe 6 having the first check valve 5 ', the hot water can 2 pushes out hot water to lower the internal pressure, and When the steam extruded to the circulation pipe 4'and the radiator 3 is liquefied and the internal pressure of the kettle 2 is further reduced, the check valve 5 and the first check valve 5'are also opened to supply cold water to the circulation pipe 4. .
Therefore, the water vapor in the circulation pipe 4'to the radiator 3 is liquefied by the water sent from the communication pipe 6, and at the same time, instead of the water vapor in the circulation pipe 4 ', the water vapor in the communication pipe 6 enters the circulation pipe 4'. The water in the open tank 1 is supplied and completely filled with water.

On the other hand, the water sent from the communication pipe 6 to the circulation pipe 4'also liquefies the water vapor in the circulation pipe 4'on the side of the boiling water can 2. Therefore, when the water in the open tank 1 enters the kettle 2 through the check valve 5, even if the kettle 2 is about to be in an empty state and a large amount of water vapor is generated, this water vapor will flow to the circulation pipe 4 '. It is liquefied by the sent water and keeps the pressure of the kettle 2 low, and then water can flow into the kettle 2 from the open tank 1, and the kettle 2 whose temperature becomes low due to the inflowing water is strongly negative. A pressure is applied and the water in the open tank 1 is sucked and filled with water. Since the circulation pipe 4'is also filled with water by this time, the hot water can be extruded next time without causing an airlock.

Further, in the present invention, the second check valve 5 "is provided in the circulation pipe 4" between the radiator 3 and the open tank 1, so that the water vapor remaining in the circulation pipe 4'is the radiator 3 or the circulation pipe 4 ".
It became liquefied only by the cold water sent from the connecting pipe 6 instead of the warm water remaining in the pipe, and the water temperature in the circulation pipe 4'is low, and the air lock due to the water vapor pool does not occur.

Since the water in the open tank 1 is used for cooling the water vapor in the circulation pipe 4'and the kettle 2, the water vapor cooling capacity decreases at high temperatures. Therefore, if a water temperature sensor 8 is provided in the middle of the connecting pipe 6, the burner 7 combustor can be switched by sensing the water temperature, preventing the trouble of hot water circulation being stopped and the amount of heat released from the radiator 3 Can be reduced. Further, as a means for solving the trouble of stopping the circulation of hot water, it is necessary to stop the combustion of the burner like a coffee siphon, but a high limit switch 9 is provided in the circulation pipe 4'which communicates with the hot water outlet of the boiling water can 2. If so, when the circulation of hot water is stopped, it is exposed to high temperature steam, so that an abnormal temperature can be detected and combustion of the burner 7 can be stopped.

[Explanation of effects]

As described above, according to the present invention, the water can be directly supplied to the circulation pipe 4'contacting the water heater 2 and the radiator 3 by the connecting pipe 6, and the water in the water heater 2 can be filled with water after the water heater 2 is full as in the conventional case. It is possible to prevent the trouble that vapor pool remains in the circulation pipe 4 ', such as when the water vapor in the circulation pipe 4'is liquefied, and to enable stable hot water circulation.

Further, the water in the open tank 1 supplied to the circulation pipe 4 ′ by the connecting pipe 6 liquefies the water vapor coming out from the hot water outlet of the hot water can 2, and the water in the open tank 1 can also flow into the hot water can 2 from the hot water outlet. It became so. For this reason, the opening / closing timing of the check valve 5 which opens and closes only under pressure conditions is not synchronized with the timing of the boiling state of the boiling water can 2, and even if a large amount of steam is generated when water enters the boiling water can 2, this steam will be generated. Can be liquefied and absorbed by the water in the circulation pipe 4 ', and the problem that the circulation of hot water is stopped due to a slight timing error as in the prior art can be solved.

Further, since the flow path for supplying water to the kettle 2 is performed not only by the circulation pipe 4 but also by the connecting pipe 6, the kettle 2 quickly fills up, and the hot water circulation cycle becomes faster, so that the hot water delivered from the kettle 2 per unit time is increased. The amount has increased.

Further, according to the present invention, it is suitable to install the open side of the open tank 1, the kettle 2 etc. outdoors and the side of the radiator 3 indoors, and the circulation pipes 4 ', 4 "are thin on the wall. It is a sanitary and safe device because it can be installed easily, it does not emit combustion exhaust gas into the room, and the radiator 3 heats fan coil type air. It is possible to achieve ideal low-temperature heating that warms the air and the floor at the same time by returning the air from the equipment to the open tank via the floor heating mat.

[Brief description of drawings]

The drawings are cross-sectional views of essential parts showing an embodiment of the present invention. 1 ... open tank, 2 ... bottle, 3 ... radiator, 4.
4 '・ 4 "... Circulation pipe, 5 ... Check valve, 5' ... First check valve, 5" ... Second check valve, 6 ... Communication pipe

Claims (2)

[Claims] 1. An open tank 1, a kettle 2 provided at a position lower than the open tank 1, and a radiator 3 to which hot water of the kettle 2 is supplied are provided, and the open tank 1, the kettle 2 and the radiator 3 are provided respectively. A hot water circulation device that automatically circulates hot water by connecting the circulation pipes 4, 4 ', 4 "and switching a valve 5 provided in the middle of the circulation pipe 4 between the open tank 1 and the water kettle 2. The valve 5 is composed of a check valve that is closed when the kettle 2 is pressurized, and a communication pipe 6 that connects the vicinity of the kettle 2 of the circulation pipe 4 ′ between the kettle 2 and the radiator 3 with the open tank 1. And a first check valve 5'for stopping the flow from the circulation pipe 4'to the open tank 1 in the connecting pipe 6, a hot water circulating device. 2. A circulation pipe 4 ″ between the radiator 3 and the open tank 1 for stopping the flow from the open tank 1 to the radiator 2.
The hot water circulation device according to claim 1, further comprising a check valve 5 ″.