JPH045951Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention can effectively regulate the water level of hot water flowing down to the hot water storage section provided at the bottom, and prevents cavitation during hot water supply. The present invention relates to a direct contact type hot water heater with a water level regulating device that can supply hot water to a location higher than the location of a hot water storage portion without causing water leakage.

[Conventional technology]

Conventionally, a combustion chamber is provided above the hot water storage section provided at the bottom, and an endothermic chamber filled with an endothermic material is provided above the combustion chamber. A direct contact system with a structure in which water is sprinkled onto a heat absorbing material and the falling water is brought into direct contact with the combustion gas of the fuel combusted in the combustion chamber to obtain hot water at the desired temperature in the hot water storage section at the bottom. Technical ideas regarding hot water heaters are published in Utility Model Publication No. 31828/1973.
It is disclosed in Utility Model Publication No. 43-31833, Utility Model Publication No. 50-34349, etc.

Such a direct contact hot water heater has a structure in which the water to be heated comes into direct contact with the combustion gas combusted in the combustion chamber as it flows down from the heat absorption chamber above the combustion chamber to the hot water storage section below. Because of this, it has very high thermal efficiency, and unlike conventional boilers that heat water in a sealed container, it heats water under atmospheric pressure, so it can be easily used at home, and the hot water obtained is The dissolved oxygen contained in the water has been degassed, making it a good hot water for rust prevention. It also incorporates the carbon dioxide contained in the combustion gas, so when used for bathing, it can be used to recover from fatigue and is used as normal tap water. It has an effect that hot water heated directly in a bath pot does not have, and its uses are expected to be quite wide.

[Problem that the invention attempts to solve]

However, conventional direct contact type hot water heaters have a structure in which the hot water obtained flows down to the hot water storage section at the bottom and accumulates. A water pump is required, and if this water pump is operated all the time, water will be sent regardless of the amount of hot water that flows down to the hot water storage section at the bottom and has accumulated, so the amount will be adjusted to match the increase or decrease in the amount of hot water. The water level detection device had to be used to operate and stop the water pump so as to supply water.

This is because if the water level of the hot water stored in the hot water storage section is too low, not only will the hot water in the hot water storage section be overheated by the combustion gas in the combustion chamber and blow out from the water pipe, but also the hot water level in the hot water storage section will be excessively low. This will raise the temperature of the hot water, which is not desirable in terms of thermal efficiency, and there is a risk that the hot water storage section will run dry due to combustion gas.Also, if the water level of the hot water stored in the hot water storage section becomes too high, the combustion chamber will become narrow. This is because the combustion efficiency of the fuel decreases and there is a risk of water entering the burner and causing a misfire.

However, if a water level detection device that detects the level of hot water stored in the hot water storage section and starts and stops the water pump is installed in a direct contact type hot water heater, the water supply becomes discontinuous. When hot water is supplied from the hot water storage section using a water pump, the water pressure increases and decreases rapidly, resulting in cavitation. In order to eliminate these drawbacks, it is possible to install an electric proportional control valve that can detect the level of hot water stored in the hot water storage unit and supply water in accordance with this water level, but this method is not possible directly. There was a problem in that the contact type hot water heater was expensive.

On the other hand, in Utility Model Publication No. 50-34750, the water level of hot water stored in a hot water storage section is detected by a float connected to the end of a cold water supply pipe, and when the water level of hot water stored in the hot water storage section drops, A method has been suggested in which cold water is supplied from the cold water supply pipe to maintain a constant level of hot water in the hot water storage section. However, since this type of method lowers the temperature of the hot water that has been obtained through heating, there is the problem that it is difficult to apply it to direct-contact hot water heaters that use hot water directly for baths, etc. It was hot.

[Means for solving problems]

The inventors of the present invention have conducted intensive research to solve the problem caused by the level of hot water stored in the hot water storage section provided at the bottom of the conventional direct contact hot water heater. The hot water stored in the hot water storage section is installed with a valve that changes the opening area communicating with the hot water supply piping in response to the up and down movement of the float floating in the hot water storage section, and a pump that supplies hot water from the hot water storage section just before the valve. By making it possible to send a suitable amount of hot water using the pump that is always in operation, the level of hot water flowing down to the hot water storage section can be effectively regulated, and cavitation will not occur when hot water is fed. They discovered that it was possible to provide a direct contact type hot water heater with a water level regulating device and completed the present invention.

That is, in the present invention, a combustion chamber is provided above the hot water storage section provided at the bottom, and an endothermic chamber filled with an endothermic material is provided above the combustion chamber. A direct-contact type of hot water that obtains hot water at a desired temperature in the hot water storage section by sprinkling water onto the heat absorbing material and bringing the falling water into direct contact with the combustion gas of the fuel combusted in the combustion chamber. The heater includes a valve whose opening area communicates with a hot water supply pipe changes in response to the vertical movement of a float floating on hot water in the hot water storage section, and a pump that supplies hot water from the hot water storage section immediately before the valve. A direct contact type hot water heater with a water level regulating device is provided.

〔Example〕

Hereinafter, the direct contact type hot water heater with a water level regulating device according to the present invention will be described in detail.

Fig. 1 is an explanatory sectional view of one embodiment of a direct contact hot water heater with a water level regulating device according to the present invention;
The figure is a sectional view taken along the line A--A in FIG. 1.

In the drawings, 1 is a heater main body, and 2 is a hot water storage section provided at the lowest part of the heater main body 1. Reference numeral 3 denotes a combustion chamber provided above the hot water storage portion 2, and this combustion chamber 3 includes a burner 4 installed below a combustion flame spout that penetrates the hot water storage portion 2 as shown in FIG. Although not included, fuel supplied from an oil or gas burner attached to the side of the heater body 1 or a gas or oil burner installed in the combustion chamber 3 is combusted,
The combustion gas is discharged from the upper part of the heater body 1. Reference numeral 5 designates an endothermic chamber provided above the combustion chamber 3. This endothermic chamber 5 is divided from the combustion chamber 3 by a cone-shaped perforated plate 6 such as a conical shape. Material 7 is filled. 8
9 is a water supply nozzle that is installed above the heat absorbing material 7 of the heat absorbing chamber 5 and sprays water to be heated onto the heat absorbing material 7; This is an exhaust stack from which the combustion gas that is combusted and heats water in the heat absorption chamber 5 is discharged. 1
Reference numeral 1 designates a shielding body which is preferably provided to shield the float 10 floating on the hot water in the hot water storage section 2 from the combustion chamber 3, and as in the illustrated embodiment, the hot water in the hot water storage section 2 is almost completely shielded from the combustion chamber 3. In addition to completely shielding, it is also possible to shield only the float 10. 12 is a connecting rod connected to the float 10; 13 is a valve whose opening area is changed by being moved by the connecting rod 12 in response to the vertical movement of the float 10;
It is installed in 15 is a valve 1 for supplying hot water from the hot water storage section 2.
This is the pump that supplies water immediately before step 3. In addition, 16 is a high water level switch that stops water supply from the water supply nozzle 8 when the water level of hot water in the hot water storage section 2 exceeds the upper limit water level, and 17 is an overflow switch that causes the hot water to overflow when the water level of hot water in the hot water storage section 2 reaches the upper limit water level. It's a tube.

[Effect]

In order to use the direct contact type hot water heater with a water level regulating device according to the present invention having such a structure, the fuel supplied to the burner 4 is combusted in the combustion chamber 3, and water is poured from the water supply nozzle 8 onto the perforated plate 6. Endothermic chamber 5
When water is sprinkled on the heat absorbing material 7 of
In addition, the sprinkled water is heated by the combustion gas before flowing down through the heat absorbing material 7 along the slope of the perforated plate 6, and then flows down along the perforated plate 6 to the periphery of the perforated plate 6. The process of flowing down around the chamber 3 along the wall surface of the heater main body 1, and further the shielding body 1
1 is installed, the process of flowing down on the shield 11 or the process of exposing the upper part of the hot water stored in the hot water storage part 2 to the combustion gas at the part of the hot water storage part 2 that communicates with the combustion chamber 3. The hot water is heated and stored in the hot water storage section 2.

In the process of heating the hot water, as shown in the figure, the perforated plate 6 is made into a conical shape such as a cone or a pyramid with an inclination angle of 10 to 60 degrees with respect to the horizontal, and the perforated hole is made to flow down from above, such as a round hole. Since the water is formed so that it flows downward sequentially along the periphery of the hole, the water sprayed from the water supply nozzle 8 onto the heat absorbing material 7 in the heat absorbing chamber 5 flows down through the heat absorbing material 7 and then flows through the porous holes. The hot water flows down along the plate 6 and flows from around the perforated plate 6 to the hot water storage section 2 along the wall surface of the heater main body 1.
Since water droplets do not directly fall from the holes formed in the perforated plate 6, the combustion gas in the combustion chamber 3 does not undergo incomplete combustion due to falling water droplets.

When the amount of hot water thus stored in the hot water storage section 2 increases, the float 10 is raised, so that the connection rod 12 corresponds to the upward movement of the float 10.
As a result, the opening area of the valve 13 increases, the amount of hot water sent by the pump 15 through the hot water supply pipe 14 increases, and the water level of the hot water in the hot water storage section 2 decreases. Furthermore, when the amount of hot water stored in the hot water storage section 2 decreases, the float 10 is lowered, so that it is moved by the connecting rod 12 in response to the downward movement of the float 10, and the opening area of the valve 13 becomes smaller, and the pump 15 Hot water supply piping 1
The amount of hot water sent through the hot water storage section 2 decreases, and the level of hot water in the hot water storage section 2 rises. At this time, if the amount of water supplied from the water supply nozzle 8 is constant and the amount of hot water used is constant, the opening area of the valve 13 will be constant.

Note that when the water level of hot water in the hot water storage section 2 exceeds the upper limit water level, the hot water higher than the upper limit water level is discharged from the overflow pipe 17, and the high water level switch 16 stops the water supply from the water supply nozzle 8, so that no more water can be used in the hot water storage section. The water level of hot water in step 2 does not rise.

[Effect of idea]

The direct contact type hot water heater with a water level regulating device according to the present invention as described in detail above is connected to a float 10 that floats on hot water in a hot water storage section 2.
A simple and inexpensive mechanical valve 13 is installed inside the heater body 1, which is moved by the connecting rod 12 to change the opening area communicating with the hot water supply pipe 14 in response to the vertical movement of the hot water. An amount of hot water commensurate with the water level of hot water in section 2 is supplied to the hot water supply pipe 14.
After that, hot water can be supplied to the locations where hot water is used. Furthermore, since the hot water in the hot water storage section 2 that is supplied to the hot water usage area is supplied by the pump 15 immediately before the valve 13, the valve 13 does not exist and the hot water valve 1
Unlike when a pump is installed in the hot water supply piping 14 at the rear of the hot water supply section 3, the hot water is repeatedly stopped and supplied depending on the hot water level in the hot water storage section 2. Cavitation does not occur because the amount of hot water sent changes only due to changes in the amount of water, and there is no sudden change in water pressure due to repeated stopping and feeding of water. Since the hot water in the hot water storage section 2 that is supplied to the hot water usage area via the hot water supply piping 14 is pressurized by the pump 15 just before this valve 13, the hot water is placed at a location higher than the location of the hot water storage section 2. It is possible to send water to Furthermore, if the structure is such that the float 10 floating above the hot water storage section 2 is shielded from the combustion chamber 3 by the shield 11, it is possible to prevent the valve 13 from malfunctioning due to the heat of the burner 4.

The direct-contact hot water heater with a water level regulating device according to the present invention, which has such effects, is an effective method for disseminating direct-contact hot water heaters, which have various advantages such as high thermal efficiency, to general households. It is of great practical value as it removes obstacles.

[Brief explanation of drawings]

Fig. 1 is an explanatory sectional view of one embodiment of a direct contact hot water heater with a water level regulating device according to the present invention;
The figure is a sectional view taken along the line A--A in FIG. 1. In the drawing, 1...Heater main body, 2...Hot water storage section,
3... Combustion chamber, 4... Burner, 5... Endothermic chamber,
6... Porous plate, 7... Endothermic material, 8... Water supply nozzle, 9... Exhaust pipe, 10... Float, 11...
Shielding body, 12... Connection rod, 13... Valve, 14...
Piping for hot water supply, 15...Pump, 16...High water level switch, 17...Overflow pipe.

Claims (1)

[Claims for Utility Model Registration] 1. A combustion chamber 3 is provided above the hot water storage section 2 provided at the bottom, and an endothermic chamber 5 filled with an endothermic material 7 is provided above the combustion chamber 3. Water is sprinkled on the heat absorbing material 7 from above the heat absorbing chamber 5 and the falling water is brought into direct contact with the combustion gas of the fuel combusted in the combustion chamber 3 to form the hot water storage section. 2. In a direct contact type hot water heater for obtaining hot water at a desired temperature, a valve 13 whose opening area communicating with a hot water supply pipe 14 changes in response to the vertical movement of a float 10 floating on hot water in the hot water storage section 2; A direct contact type hot water heater with a water level regulating device, characterized in that a pump 15 for supplying hot water from the hot water storage section 2 to the valve 13 is installed. 2. A direct contact type hot water heater with a water level regulating device according to claim 1, wherein the float 10 floating on the hot water in the hot water storage section 2 is shielded from the combustion chamber 3 by a shielding body 11.