JPS6137532B2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a low combustion type (input approximately 5000 to 10000 Kca/h) having multiple immersion tube heat exchangers.
The hot water storage type water heater had the disadvantage that the rate of rise in hot water temperature was slow, but this defect was improved by providing a cover on the top of the immersion tube heat exchanger and creating a configuration that could obtain high temperature hot water in a short time. With the goal.

Traditionally, low-input type hot water storage type water heaters
A two-heat source hot water storage type water heater, as shown in Figure 3, was designed to obtain a relatively small amount (about 40 to 50 ml) of hot water in a short period of time.

In the hot water storage type water heater shown in Fig. 3, immersion tube heat exchangers 2 and 3 (hereinafter referred to as heat exchangers) each having a cylindrical cross section are installed in a can body 1 in a direction approximately perpendicular to the can body. , burners 4 and 5 are set in each heat exchanger. The combustion capacity of the burner is 5000 ~
It is generally around 6000Kca/h. heat exchanger 2
and 3 also serve as the combustion chamber. Also heat exchangers 2 and 3
are provided with exhaust holes 6 and 7, respectively.
At the tip of the exhaust pipe 8 that connects each exhaust hole,
An exhaust fan 9 is set. 10 is an exhaust top. Further, water is supplied to the can body 1 through a water supply port 11, and hot water is supplied through a hot water supply port 12.

In a hot water storage type water heater configured as described above, normally only the burner 5 burns. After the combustion gas transfers heat to the surrounding water in the heat exchanger 3, it passes through the exhaust hole 7.
The suction from the exhaust fan 9 passes through the exhaust top 1.
0 and released into the atmosphere. In this case, the temperature of the water inside the can (usually 200°C) rises almost uniformly across the top and bottom, so it takes time to reach the temperature of 40 to 50°C when washing the toilet, dishes, etc. (120 to 180 minutes at an input of 5000 Kca/h) Therefore, in order to obtain high-temperature hot water in a short time in this type of hot water storage type water heater, the burner 4 at the top of the can body is used to burn the hot water. Even when the burner 4 is burned, the combustion gas transfers heat to the water around the heat exchanger 2, and the exhaust hole 6
The air is sucked into the atmosphere through the fan 9 and discharged from the exhaust top 10 into the atmosphere. In this case, since the amount above the heat exchanger 2 is smaller (40 to 50), the rate of increase in water temperature is faster, and hot water can be obtained in a relatively short time (hereinafter referred to as a quick release mechanism). .

As mentioned above, conventional hot water storage water heaters with a mechanism for quickly drawing high-temperature water use two heat sources (a burner and a heat-light exchanger), which are used differently depending on the purpose. In other words, in order to uniformly boil the entire can, the heat source at the bottom of the can was used, and in the case of a quick-draw mechanism that produced high-temperature water in a short time, the heat source at the top of the can was usually used.

However, even when the inside of the can is heated uniformly by the heat source at the bottom of the can, air still flows through the heat exchanger 2 at the top. Naturally, the air flow is lower than the temperature of the hot water inside the can, so in the heat exchanger 2, heat is transferred from the hot water inside the can to the air. Therefore, in addition to the normal heat radiation of the hot water storage type water heater, the heat radiation from the heat exchanger 2 is added, causing a reduction in thermal efficiency. In addition, the capacity of fan 9 must be able to simultaneously burn two burners, the upper and lower, which is twice the originally required capacity (approximately 10 m ³ /h in the case of 5000Kca/h per burner). . This not only increases the size of the fan, but also increases the product cost, which is a major drawback. Similarly, the structure required twice the original capacity of the burner and heat exchanger, which had a major structural drawback that caused a significant increase in product cost.

The present invention improves the drawbacks of the conventional hot water storage type hot water heater, has a single heat source, minimizes the increase in manufacturing cost, and constitutes a mechanism for quickly drawing hot water. An embodiment of the present invention will be explained in detail below.

In FIG. 1, an immersion tube heat exchanger 3 is provided inside a can body 1, and a cover 13 having a semicircular cross section is provided on the top of this heat exchanger.
A pipe 14 is attached to the left end of the can body 1 and led out of the can body 1. The tip of the pipe 14 penetrates into the can body 1 again from the upper part of the can body 1. The cover 13 is configured to be inclined so that hot water can easily flow toward the left end pipe 14. A valve 15 is provided in the middle of the pipe 14 to control the flow of hot water within the pipe 14.

In the above structure, the combustion gas combusted in the burner 5 transfers heat to the surrounding water in the heat exchanger 3, and then is discharged from the exhaust pipe 8, through the fan 9, and into the atmosphere from the exhaust top 10.

The flow of water around the heat exchanger 3 is as schematically indicated by arrows in FIG. In Fig. 2, the water around the heat exchanger 3 tries to flow upwards due to natural convection as shown by the arrow, but the water around the heat exchanger 3
3, the pipe 14 and the concentrated flow flow. Therefore, the hot water collected by the cover 13 is guided to the upper part of the can body through the pipe 14. Therefore, even in a relatively low-input hot water storage type water heater with a large can capacity (200 to 300), hot water can be obtained in a short time.

Also, a pipe 14 that guides high-temperature water to the upper part of the can body 1
is located outside the can body 1, so there is no heat radiation to the relatively low temperature water in the middle. Therefore, the temperature drop is also small. In addition, the valve 15 and the like can be easily assembled and maintained.

On the other hand, when substantially the entire inside of the can body 1 is to be uniformly boiled, the movement of high-temperature water to the upper part of the can body through the pipe 14 is stopped by closing the valve 15. In this case, the hot water overflows from the opening of the cover 13 and flows around the heat exchanger 3 into the can body 1.
The inside is heated almost evenly. Therefore, no abnormality occurs within the cover 13.

The valve 15 may be, for example, a solenoid valve, and by incorporating the solenoid valve into the circuit, it is possible to automatically switch between the rapid boiling mechanism and the boiling of the entire can body.

Further, in the configuration of the present invention, the cover 5 of the heat source section
With one set of heat exchangers 3, it is possible to achieve the desired rapid heating mechanism and to boil the entire inside of the can. Therefore, the manufacturing cost can be much lower than the conventional two heat source type.

As described above, according to the present invention, a cover that covers a part of the immersion tube in the immersion tube heat exchanger provided at the lower part of the hot water storage can is provided at the upper part of the immersion tube, and the cover is connected to the can through the outside of the can. A pipe connected to the upper part is attached, and a closing body is provided in the middle of the pipe. By opening the closing body, high temperature hot water can be obtained in a short time by the action of the cover. In addition, when the closing body is closed, almost the entire inside of the can can be heated uniformly, and its configuration includes a single heat source, a cover with a simple structure, a pipe, Since only the closing body is provided, the manufacturing cost can be extremely low. In addition, unlike conventional heat exchangers that have two heat exchangers, there is no heat dissipation in the heat exchanger, which prevents a decrease in thermal efficiency.Moreover, the combustion fan's capacity is limited to the required amount of combustion. Since the required size is sufficient, there is no increase in manufacturing costs unlike in the case of conventional two heat exchangers, and furthermore, the temperature of the hot water collected by the cover is almost constant. Therefore, in the present invention, the hot water is collected by the cover and guided to the upper part of the hot water tank through the pipe, and the temperature inside the hot water tank can also be stabilized.
As a result, a constant hot water temperature can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a hot water storage type water heater according to an embodiment of the present invention, Fig. 2 is a sectional view of the immersion pipe of the hot water storage type water heater taken along line A-A in Fig. 1, and Fig. 3 is a conventional FIG. 2 is a sectional view of a two-heat source type hot water storage type water heater. 3... Immersion tube heat exchanger, 13... Cover, 14
...Pipe, 15...Valve (closing body).

Claims (1)

[Claims] 1. In a hot water storage type water heater in which an immersion tube type heat exchanger is provided in the lower part of the hot water storage can, penetrating the hot water storage tank in a substantially horizontal direction, a cover that covers a part of the immersion tube is provided in the upper part of the immersion tube, and the cover A hot water storage type water heater, characterized in that a pipe connected to the upper part of the can body through the outside of the can body is attached to the can body, and a closing body is further provided in the middle part of the pipe.