JPH0132909B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides low input (e.g. 10000kcal/h)
It is a hot water storage type water heater with a large capacity (for example, 200 ml) of hot water storage capacity, and is used for general home or commercial purposes.

The present invention relates to a hot water storage type water heater with low input capacity and large capacity. This hot water storage type water heater had the following drawbacks.

(1) Since the amount of hot water stored is large, it takes a long time to boil the water.

(2) Even if only a small amount of hot water (for example, 50 to 60 °C) is used, the entire stored amount of hot water (for example, 200 °C) must be boiled.

(3) When the entire amount of hot water is used up in a short period of time, even if you want a little more hot water, you cannot get hot water right away because it takes a long time to boil the water.

Currently, there are the following conventional examples of hot water storage type water heaters that pursue these points.

In FIG. 4, 7 is a hot water storage tank, and 13 is a water sprue. 3 is a water supply port, and 2 and 8 are heat exchangers installed in the hot water storage tank 7. 1 and 4 are burners.

Next, the operation will be explained.

(1) When a large amount of hot water storage is required.

When a large amount of high-temperature hot water is required during winter or the like, by operating the burner 1 installed at the bottom of the hot water storage tank 7, almost the entire amount of stored hot water can be uniformly heated and high-temperature hot water can be obtained. (Alternatively, it is possible to operate burner 4 at the same time.) (2) When a small amount of hot water storage is required.

When a small amount of hot water is sufficient, such as during summer, or when a large amount of high-temperature hot water is used up and high-temperature hot water is required in a relatively short period of time, burner 4 is operated, and the hot water located near and above heat exchanger 8 is operated. You can get hot water.

The disadvantages of the above conventional example are:
) only. Multiple control (50, 100) is difficult in terms of configuration and cost.

(b) Since a heat exchanger is installed inside the hot water storage tank, there are structural difficulties in increasing capacity. Therefore, it is difficult to obtain hot water in a short time.

The following conventional example will be explained.

In FIG. 5, 2 is a heat exchanger, and 2 is a heat exchanger inlet located at the inner bottom of the hot water storage tank 7.
Reference numeral 11 denotes a heat exchanger outlet located at the upper part of the hot water storage tank.

Next, the operation will be explained.

The hot water that enters from the inlet portion 8 and is heated by the heat exchanger 2 enters the upper part of the hot water storage tank 7 from the heat exchanger outlet portion 11 and is circulated. In this case, if only a small amount of hot water is stored, it is possible to obtain almost uniform high-temperature hot water from the vicinity of the heat exchanger outlet 11 upwards, but if a large amount of hot water is to be stored using this method, the hot water storage tank 7 as shown in FIG. The disadvantage is that the temperature distribution inside the top and bottom is extreme, and the temperature of the hot water at the time of tapping is unstable.

The present invention has low input (e.g. 10000kcal/h)
The purpose of this system is to achieve the following points by controlling the amount of circulation between the hot water storage tank and the heat exchanger in a hot water storage type water heater that has a large hot water storage capacity (for example, 200 ml). .

(1) Large-volume hot water storage and small-volume hot water storage can be used depending on the purpose of use, enabling economical use.

(2) A small amount of hot water can be obtained in a short time.

(3) Stabilize the hot water temperature for both large-volume and small-volume hot water storage.

In the present invention, the heat exchanger and burner unit are installed outside the hot water storage tank, the water supply port to the heat exchanger and the hot water supply port from the heat exchanger are connected to the hot water storage tank, and the water supply to the heat exchanger in this circuit is connected. A large amount of hot water can be stored by installing a pump that can control the circulation rate near the mouth, installing a pipe with multiple small holes from the hot water supply port into the hot water storage tank, and oriented the small holes toward the bottom of the hot water storage tank. To provide a hot water storage type water heater that can obtain a high temperature uniform amount of hot water when storing a small amount of hot water.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

1 is a burner, and 2 is a fin-pipe heat exchanger. The burner 1 and the fin type heat exchanger 2 are surrounded by a case 3 in an appropriate arrangement and are installed at the lower side of the hot water storage tank 7. An exhaust pipe 4 is provided at one end of the case 3, and a fan 5 and an exhaust top 6 are provided at the tip. One end of the heat exchanger 2 is a water supply port 8, which is connected to a hot water storage tank 7 via a pump 9 that can vary the amount of circulation. The other end of the heat exchanger 2 is connected to a heated water outlet 11 via a hot water pipe 10. Furthermore, hot water pipe 10
A hot water pipe 10A in the hot water storage tank, which has a plurality of small holes 10B as an extension of the hot water tank, is fixed to the heated water outlet 11. The position of the tap water pipe 10A can be freely selected. Reference numeral 12 denotes a temperature detector that detects the temperature of hot water in the hot water storage tank 7 and controls the burner 1 to turn on or off. 13 is a hot water outlet provided at the upper part of the hot water storage tank 7.

The operational aspects of the above configuration will be described.

(1) For large quantities of hot water storage.

When the burner 1 is ignited and the circulation pump 9 is operated, water in the hot water tank 7 enters the heat exchanger 2 through the water supply port 8 and is heated. The hot water that has passed through the heat exchanger 2 and is heated flows from the hot water supply pipe 10 through the heated water outlet 11 and from the plurality of small holes 10B provided in the hot water tap pipe 10A to the lower part of the hot water storage tank 7. It is ejected almost evenly from the holes. In this case, maximize the ability of the circulation pump 9,
Heat exchange is performed within the heat exchanger 2 by increasing the circulation rate (for example, 10/min). If the capacity of the burner 1 is constant, the temperature and speed of the hot water passing through the hot water supply pipe 10 are determined. Further, high-temperature hot water is ejected at a certain speed downwardly within the hot water storage tank 7 from a plurality of small holes 10B provided in the hot water tap pipe 10A. The high-temperature hot water spouted into the hot water storage tank 7 has components that move to the upper part of the hot water storage tank 7 by natural draft while exchanging heat with surrounding water.
It is roughly divided into a component that moves downward depending on the ejection speed. In addition, the hot water storage tank 7 as a whole "flows" from the small hole group of the hot water outlet pipe 10A toward the water supply port 8.
occurs and circulation takes place. The larger the circulation rate, the lower the temperature of the hot water spouted from the plurality of small holes 10B, and the smaller the upward draft. Further, diffusion and mixing within the hot water storage tank 7 is promoted, and a uniform hot water temperature distribution can be obtained as a whole.

(2) For storing a small amount of hot water.

When the burner 1 is ignited and the circulation pump 9 is activated, the water in the hot water tank 7 flows from the water supply port 8 to the heat exchanger 2.
It goes inside and gets heated. The hot water that has passed through the heat exchanger 2 and is heated flows from the hot water supply pipe 10 through the heated water outlet 11 and from the plurality of small holes 10B provided in the hot water tap pipe 10A to the lower part of the hot water storage tank 7. It is ejected almost evenly from the holes.

In this case, the capacity of the circulation pump 9 can be controlled to make the circulation rate relatively small (for example, 3/min to 4/min).
/min) The speed of the hot water passing through the hot water supply pipe 10 is small, and the temperature of the hot water is higher than in the case of storing a large amount of hot water. Therefore, the hot water pipe 10
The hot water spouted from the group of small holes A has a large draft effect, and the water existing in the vicinity of the hot water tap 10A and above undergoes rapid heat exchange and the temperature rise is promoted. On the other hand, since the amount of water circulated below the hot water tap pipe 10A is small, sufficient heat transfer is not carried out, and as a result, a predetermined amount (for example, 50) of high temperature is applied to the upper part of the hot water storage tank 7 from around the hot water tap pipe 10A as a boundary. can be obtained in a short period of time.

In the present invention, a plurality of small holes 10B are provided in the hot water pipe 10A to subdivide the high temperature hot water and exchange heat with the water in the hot water storage tank 7, so that a more uniform hot water temperature can be achieved whether a large amount of hot water or a small amount of hot water is stored. It is something that can be secured.

Further, as a method of controlling the circulation amount of the circulation pump 9, the same effect can be obtained by changing the flow path resistance by using a valve or the like.

Furthermore, if the circulation amount is controlled in multiple stages, it is possible to set the hot water storage amount to 50, 100, etc. for a small amount of hot water storage, and 200 for a large amount of hot water storage, and diversification of the hot water storage amount can be expected.

As mentioned above, by realizing both the functions of large quantity hot water storage and small quantity hot water storage using the same hot water storage tank, the usability can be considered as follows.

●In the summer, a small amount of hot water storage is mainly 100 or 50.

●In winter, a large amount of hot water is stored, mainly 200.

In other words, it can be used depending on the season.

As is clear from the above description, according to the present invention, the heat source section of the hot water storage tank is separated, and the circulation amount can be controlled in the circuit that introduces high-temperature water from the bottom of the hot water storage tank through the heat exchanger to the approximately middle part of the hot water storage tank. The following effects can be obtained by arranging a suitable pump.

As explained above, according to the present invention, the following effects can be expected.

(1) The ability to store large amounts of hot water and small amounts of hot water at the same time enables economical use and is extremely economical.

(2) High temperature hot water can be obtained in a short time when storing a small amount of hot water.

(3) It is extremely easy to use because it can be used according to the hot water supply load.

(4) Since the hot water storage tank and heat source are separated, products can be diversified according to the capabilities of each.

(5) By installing the circulation pump near the water supply port of the heat exchanger, relatively low-temperature hot water in the hot water storage tank will pass through, so there will be no adverse thermal effects, and the life of the circulation pump can be expected to be extended. can.

[Brief explanation of drawings]

Figure 1 is a schematic sectional view of a hot water storage type water heater according to an embodiment of the present invention, Figure 2a is a boiling performance diagram when storing a large amount of hot water, Figure 2b is a hot water discharging performance diagram, and Figure 3a is the same diagram.
Figure 3b is the same boiling performance diagram when storing a small amount of hot water as above.
Figure 4 is a cross-sectional view of a conventional hot water storage type water heater equipped with heat exchange sections in the upper and lower parts, Figure 5 a.
5 is a sectional view of a conventional hot water storage type water heater that introduces high-temperature hot water only into the upper part of the hot water storage tank, and FIG. 1...Burner, 2...Heat exchanger, 7...Hot water tank, 8...Water inlet, 9...Circulation pump, 10...
Hot water supply pipe, 11...Heating water outlet, 10A...Hot water outlet pipe, 10B...Small hole.

Claims (1)

[Claims] 1 A heat exchanger and a burner unit are installed outside the hot water storage tank, a water supply port to the heat exchanger is provided at the bottom of the hot water storage tank, a heated water outlet from the heat exchanger is provided approximately in the middle of the hot water tank, and the water supply port and A pipe that is equipped with a pump that can control the amount of circulation into the piping circuit with the heat exchanger and that has a plurality of small holes from the heated water outlet in the approximately middle section into the hot water storage tank is installed horizontally, and the position of the small holes is determined. A hot water storage type water heater that points downward.