JPH035668A - Hot water circulation device - Google Patents

Abstract

PURPOSE:To stabilize the combustion of a burner by allowing the device to recover heat radiation from the burner and a water heater can with the use of air for supplying the burner while allowing the device to cool combustion air of high temperature with the use of water which is returned to an open top tank through a circulation pipe from a radiator. CONSTITUTION:Since the outside of a water heater can 2 and a burner 7 are surrounded to provide a wind introduction passage 9 so that combustion air may pass, the combustion air flowing in the wind introduction passage 9 obtains high temperature by the heat radiation from the water heater can 2 and the burner 7 to recover the heat radiation. On the other hand, a circulation pipe 4'' in which water is return from a radiator 3 to an open top tank 1 is positioned in the wind introduction passage 9, the combustion air of the high temperature is cooled by water flowing in the circulation pipe 4'' to obtain low temperature, since the combustion air is directed toward a inlet port of a blower 8, an air passage for the blower 8 and the burner 7 keeps low temperature, and temperature difference of the combustion air just after ignition and after long time operation is small to stabilize the combustion of the burner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hot water device that pumps and circulates hot water heated in a water boiler under steam pressure without using a circulation pump.

[Conventional technology]

■ One method of boiling coffee is the coffee siphon. When the coffee comes to a boil, the water in the lower pot is pushed upwards by steam pressure, leaving only water vapor in the lower pot. When the burner is turned off and the temperature drops, the water vapor in the lower pot liquefies, creating negative pressure, and the pushed up water is sucked into the lower pot again and comes down as hot water used to boil coffee. There is.

Using this principle, hot water heated in a conventional water boiler is pumped using steam pressure, and the heat radiator (fan coil unit, floor mat, etc.)
A number of proposals have been made for water heating devices that return water to the water boiler after it has been cooled by heat dissipation. However, in an experiment, when the inside of the water boiler became empty, the water sent to the water boiler immediately boiled, and the pressure of the large amount of water vapor generated inside the water heater interfered and returned from the radiator to the open tank. There is a drawback that it is difficult for water to enter the water boiler, and in order to solve this problem, the applicant has made effective use of check valves, etc. I'm here with a proposal.

[Problem that the invention seeks to solve]

The problem of smoothly returning water to the open tank has been solved in the applicant's past applications, but the device of the present invention installs the heat source such as a water boiler or burner outside, and only the circulation pipe is connected. Since it is a device that can penetrate a wall and communicate with a radiator indoors, it is necessary to reduce heat loss as much as possible and increase thermal efficiency outdoors. However, when the temperature of the combustion air supplied to the burner increases with the heat recovered from the heat radiation, the parts used in the burner are required to have heat resistance, and deterioration of the parts due to high temperatures adversely affects the combustion performance of the burner.

Furthermore, the combustion state of the burner changes depending on whether the temperature of the combustion air is low or high, making it extremely difficult to achieve stable combustion in both cases.

[Means for Solving the Problems] This invention recovers the heat radiated from the burner and water boiler by the air supplied to the burner, and also recovers the high temperature combustion by using the water that returns from the radiator to the open tank via the circulation pipe. The purpose is to cool the air and stabilize combustion in the burner. The configuration will be explained below with reference to figures showing examples.

1 is an open tank with a passage a communicating with the atmosphere on one side. 2 is a water boiler installed at a lower position than the open tank 1, 3 is a radiator to which hot water from the water boiler 2 is sent, and the open tank 1, the water boiler 2, and the radiator 3 are connected to each other via circulation pipes 4, 4', and 4''. The circulation pipe 4 comes out from the bottom of the open tank 1 and is connected to the water boiler 2 via a check valve 5 provided in the middle.

Also, a circulation pipe 4 connecting the bottom of the water boiler 2 and the radiator 3
' is branched from near the water boiler 2 and a connecting pipe 6 is attached, and the end of the connecting pipe 6 is connected to the open tank 1. 5' is a first check valve installed in the middle of the communication pipe 6. 5″ is radiator 3
This is a second check valve installed in the middle of the circulation pipe 4'' connecting the open tank 1 and the open tank 1.

The check valve 5 controls the flow from the water boiler 2 to the open tank 1, the first check valve 5' controls the flow from the circulation pipe 4' to the open tank 1, and the second check valve 5'' controls the flow from the open tank 1. It has a backflow prevention function that stops the flow to the radiator 3.

7 is a burner that heats the water boiler 2, and the heat source may be either gas or oil. 8 is a blower that sends combustion air to burner 7;
Reference numeral 9 denotes an air guide path formed by surrounding the outside of the water boiler 2 and the burner 7 with a wall 10. A through-hole/mipe 4'' that connects the radiator 3 and the open tank 1 is installed in the air guide path 9 to allow air to pass through, and is made to meander near the inlet of the blower 8 to release heat. The combustion air, which has become high in temperature due to heat radiation from the water boiler 2 and the burner 7, is cooled while increasing the temperature of the water flowing through the heat exchanger 4'', and the low temperature air is sent to the burner 7. supplying.

Reference numeral 11 designates a water temperature sensor installed between the first check valve 5' of the connecting pipe 6 and the open tank 1. When hot water starts circulating after startup, the water in the open tank 1 flows into the connecting pipe 6. A water temperature sensor 11 senses the temperature and changes the amount of combustion of the burner 7. This water temperature sensor 11 may be attached to the circulation pipe 4 between the check valve 5 and the open tank 1. 1
2 is a high limit switch installed on the water boiling can 2 side of the circulation pipe 4', and since this circulation pipe 4' is connected to the hot water outlet of the water boiling can 2, there is no problem of the water boiling can 2 running dry and the circulation cycle stopping. Even if it occurs, it is sensed and combustion in the burner 7 is stopped. 13 is a water supply tank connected to the open tank 1 via water supply pipe b and air supply pipe a; water inlet 13;
The water supply tank 13 is provided with a cap 14 at the water inlet 13' which also serves as a vent to the atmosphere.

[Explanation of action]

In the present invention having the configuration shown in the above embodiment, when the water supply cap 14 is opened and water is supplied from a suitable water supply can, water is supplied from the water supply tank I3 to the open tank 1 through the water supply pipe.

The supplied water is passed from the open tank 1 to the circulation pipes 4 and 4' by removing air or pressurizing it by an appropriate method.
- 4'', housed in the water boiler 2, radiator 3, and communication pipe 6, respectively.

However, when burner 7 is lit and water boiler 2 is heated, +1
The water in the can 2 begins to boil, and the generated steam increases the pressure in the water boiler 2. This pressure closes the check valve 5, and the hot water is sent from the circulation pipe 4' to the radiator 3, where it becomes steam-cold water and enters the open tank. 1
will be returned to. When all the water in the water boiler 2 is pushed out, the generation of water vapor in the water boiler 2 stops and the pressure decreases, and the remaining water vapor is liquefied in the circulation pipe 4' and the radiator 3, so the water in the open tank 1 is When the check valve 5 is opened, water flows into the water boiler 2, cools the water boiler 2, and liquefies water vapor, creating negative pressure and sucking water in the open tank 1. Since the burner 7 continues to burn, it heats the water boiler 2 and sends hot water to the radiator 3 again.

At this time, since the circulation pipe 4' at the outlet of the water boiler 2 and the open tank 1 are connected by the communication pipe 6 fitted with the first check valve 5', the water boiler 2 pushes out hot water 7 and lowers the internal pressure. When the water vapor pushed out to the circulation pipe 4' and the radiator 3 liquefies and the internal pressure of the water boiler 2 decreases, the first check valve 5' opens together with the check valve 5, and the tank 1 is directly opened to the circulation pipe 4'. water is supplied, and the inside of the circulation pipe 4' is reliably filled with water, so that a stable hot water circulation cycle can be performed.

By the way, in this invention, the air guide path 9 is provided surrounding the outside of the water boiler 2 and the burner 7 so that the combustion air can pass through. The temperature becomes high and the heat released is recovered. On the other hand, a circulation pipe 4 through which water flows from the heat spreader 3 to the open tank 1
'' is located in the air guide path 9, the high-temperature combustion air is cooled by water flowing through the circulation pipe 4'', becomes lower temperature, and flows toward the inlet of the blower 8, and then to the blower 8 and burner 7. The air flow path of the burner maintains a low temperature, and the difference in temperature of the combustion air immediately after ignition and after long-term operation is small, and combustion in the burner is stable. Further, there is no need to attach a heat-resistant structure to parts such as the blower 8.

On the other hand, the circulation pipe 4″ that cooled the combustion air that recovered the dissipated heat
Since the water in the tank is returned to the open tank 1 at a high temperature, it is effectively used for heating in the next water boiler 2, improving thermal efficiency.

[Explanation of effects]

As described above, this invention is a device that does not use a pump for hot water circulation, and is suitable for installing the water heater outdoors and the radiator inside the room by passing the circulation pipe used for hot water circulation through the wall. , occupants are not exposed to exhaust gas, and can take advantage of the benefits of a sanitary and safe device.

Since the water heater is installed outdoors, it is required to minimize heat loss, so in this invention, the return pipe from the radiator 3, that is, the circulation pipe 4'' is surrounded by a wall 10 on the outside of the burner 7. Since the structure is such that the air is returned to the water heater can 2 through the air guide path 9, the hot water is heated by the high-temperature combustion air in the air guide path 9 that recovers the heat released from the water heater 2 and the burner 7, and then returns to the water heater can 2. The circulation cycle is fast and heat loss is extremely low.

In addition, the air in the air guide path 9 is constantly flowing due to the blower 8 at the end of the air guide path 9 while the water heater is in operation, and the heat released from the water heater 2 and the burner 7 is continuously recovered and the circulation pipe 4'' is heated. It is carried out efficiently.

In addition, the air supplied to the blower 8 becomes high in temperature by recovering the heat radiated from the water heater 2 and the burner 7 in the air guide path 9, but the recovered heat is directly used to heat the water flowing through the circulation pipe 4''. As a result, the temperature of the air flowing to the intake port of the blower 8 is maintained at a low temperature, so there is no need to use custom-made parts with excellent heat resistance for the parts of the blower 8, and conventional products can be used as is. Since the temperature of the supplied air does not vary widely, the burner 7 is capable of stable combustion without any special measures being taken.

[Brief explanation of drawings]

The drawing is a sectional view of a main part showing an embodiment of the present invention. ■・・・Open tank, 2・・・Kettle, 3
・・・・・・Radiator 4・4′・4″・・・Circulation pipe, 7・・・Burner, 8・・・Blower,
9... Air guide path

Claims (1)

[Claims] An open tank 1, a water boiler 2 provided at a lower position than the open tank 1, and a radiator 3 to which hot water from the water heater 2 is supplied are provided. In a hot water circulation device that automatically circulates hot water by communicating with the water heater 2 through the hot water circulator, the air guide path 9 to the blower 8 that sends combustion air to the burner 7 that heats the water heater 2 is connected from high-temperature parts such as the burner 7 and the water heater 2. The hot water circulation device is installed at a position to collect the heat radiated from the tank, and guides the circulation pipe 4'' returning to the open tank 1 to the air guide path 9 for heat exchange.