JPH0711343B2 - Hot water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a hot water storage water heater installed in a water heater, a washroom, a bathroom, or the like.

[Prior Art] In recent years, various types of hot water storage water heaters A for supplying hot water stored in a tank have been provided. For example, as shown in FIG. 4, a hot water supply pipe 5 is drawn out from a tank 1 in which hot water is stored, and a hot water supply pipe 5 is provided with a caran 7a as a hot water discharge part 7, as shown in FIG. The hot water in the tank 1 is supplied to the user through the hot water supply pipe 5 and the calan 7a. By the way, the amount of hot water usually used for one hand washing is about several tens cc to several hundreds cc, and the time is about 1 second to 2 seconds. For this reason, the hot water discharged from the calan 7a is discharged by the amount retained in the hot water supply pipe 5 from the tank 1 to the calan 7a. However, the temperature of the hot water that has accumulated in the hot water supply pipe 5 has dropped to almost room temperature, which may be lower than in the greenhouse in winter and the like.
Therefore, when the amount of hot water discharged from the calan 7a is small or the frequency of use is low, the water having a low temperature accumulated in the hot water supply pipe 5 is discharged, and hot water is not discharged even if the calan 7a is opened. There is a thing. Therefore, it is possible to circulate the hot water in the hot water supply pipe 5 as hot water stored in the hot water supply pipe 5.
The one disclosed in Japanese Patent No. 0120 is provided. This one has two hot water supply pipes 5 as shown in FIG.
The upper end of the tank 1 is connected to the upper part of the tank 1 and the lower end of the tank 1 is connected to the lower part of the tank 1 to form an annular circulation pipe 6. In the circulation pipe 6, hot water circulates. By doing so, the hot water is circulated without staying in the hot water supply pipe 5 so that it does not become low temperature water.

[Problems to be Solved by the Invention] However, in the above-mentioned one, the hot water circulating in the circulation conduit 6 is returned to the lower part of the tank 1, and is connected to the lower part of the tank 1 when tapping hot water. Hot water is also discharged from the hot water supply pipe 5. However, since the hot water is introduced into the lower part of the tank 1, the temperature is low, and at the time of tapping, the low temperature water in the lower part of the main tank 1 is tapped through the hot water supply pipe 5 connected to the lower part of the tank 1. The temperature of the hot water is drastically lowered. In addition, the circulation of hot water is performed by convection of the hot water in the entire tank 1. Since the circulation force is weak and the hot water supply pipe 5 becomes long, the circulation of hot water is not reliably performed. There is a problem that the temperature becomes low and it is difficult to keep the hot water in the hot water supply pipe 5 at a high temperature.

The present invention is intended to solve the above problems, and an object of the present invention is to reliably circulate hot water in a hot water supply pipe connected to a hot water outlet such as a curran, and to supply the hot water from a tank. It is possible to provide hot water having the same temperature as the incoming hot water in the hot water supply pipe, and to provide a hot water storage hot water device that can constantly discharge hot water even when a small amount or a short time is taken from the hot water supply part. .

[Means for Solving the Problems] In order to achieve the above object, the hot water storage water heater A according to the present invention has a sub tank 2 having a smaller capacity than the main tank 1 arranged in the lower portion of the main tank 1. A water supply pipe 3 for supplying water in the main tank 1,
The sub-tank 2 is provided with a heat source part 4 for heating the stored water in the sub-tank 2, and the bottom of the sub-tank 2 located in the lower part of the main tank 1 is provided with an inflow port 2a for introducing the stored water in the main tank 1 and the sub-tank. An outlet 2b for discharging the hot water in the sub-tank 2 into the main tank 1 is provided on the upper part of the sub tank 2, and a hot water supply pipe 5 for supplying the hot water in the sub tank 2 is led out from the upper part of the sub tank 2 and the tip of the hot water supply pipe 5 The circulation pipe 6 is formed by connecting the parts to the lower part of the sub-tank 2, and the hot water supply part 7 such as a currant 7a is provided at an appropriate position of the hot water supply pipe 5 forming the circulation pipe 6.

Further, the tip of the hot water supply pipe 5 provided with the hot water outlet 7 such as the calan 7a may be made to face the lower portion of the main tank 1 located below the sub tank 2.

[Operation] The water in the main tank 1 is gradually heated by heat conduction from the sub tank 2 having the heat source portion 4 provided therein. When hot water is discharged, the hot water in the main tank 1 flows into the sub tank 2 through the inflow port 2a and the outflow port 2b provided in the sub tank 2, is heated by the heat source unit 4 arranged in the sub tank 2, and is heated from the hot water supply pipe 5. It will be bathed. Further, when the hot water is not discharged, the water in the main tank 1 flows into the sub tank 2 through the inflow port 2a and is heated by the heat source unit 4, and the hot water heated to a high temperature in the sub tank 2 is discharged to the upper portion of the sub tank 2. It flows out into the main tank 1 little by little from the provided outlet 2b,
The hot water in the main tank 1 is gradually heated while being mixed with the water in the main tank 1. Further, when the hot water is not discharged, the hot water in the sub tank 2 circulates by convection in the hot water supply pipe 5 which is led out from the upper part of the sub tank 2 so as to form the circulation pipe line 6 and is connected to the bottom part of the sub tank 2. The hot water in the hot water supply pipe 5 is always kept at a high temperature.

[Examples] Hereinafter, the present invention will be described in detail based on illustrated examples.

As shown in FIG. 1, a hot water storage water heater A for supplying hot water, which is arranged in a kettle room or a kitchen, is provided in a main tank 1 arranged in an outer shell 8 and a bottom portion of the main tank 1. The main body is constituted by the sub tank 2 thus formed. A heat insulating material is provided on the outer surface of the main tank 1 so that the surface of the outer shell 8 does not reach a high temperature due to heat conduction from the main tank 1. The sub-tank 2 having a smaller capacity than the main tank 1 is formed in a cylindrical shape, and a heater 4a as a heat source part 4 is installed inside the sub-tank 2. The heater 4a heats the water flowing into the sub-tank 2. I am able to do it. At the bottom of the sub-tank 2 is provided an inlet 2a for inflowing the hot water in the main tank 1 into the sub-tank 2, and in the upper part the hot water in the sub-tank 2 is gradually discharged into the main tank 1. The outflow port 2b is provided. Then, the water in the main tank 1 is gradually heated by the heat conduction from the sub-tank 2 having the heat source part 4 therein to become hot water, and the hot water located at the bottom is introduced into the sub-tank 2 through the inflow port 2a. It is designed to be heated by the heat source unit 4 and to be supplied with hot water through the hot water supply pipe 5. Further, the hot water heated to a high temperature in the sub tank 2 flows out into the main tank 1 through the outlet 2b and is mixed with the hot water in the main tank 1 to raise the temperature of the hot water in the main tank 1. At this time, the inlet 2a is the outlet
The opening area is smaller than 2b. This is the outlet
This is to prevent the temperature of the hot water discharged from abruptly lowering when a large amount of the relatively low temperature hot water located at the bottom of the main tank 1 from 2b flows into the sub tank 2. When the hot water in the sub tank 2 is not discharged through the hot water supply pipe 5, the hot water located at the bottom of the main tank 1 flows into the sub tank 2 through the inflow port 2a and the main tank 1 flows in the main tank 1 through the outflow port 2b. Convection occurs in the main tank 1 due to the outflow of high-temperature hot water in the sub tank 2 heated by the heat source unit 4,
It is designed to prevent a large temperature difference between the hot water inside and above. The main tank 1 is provided with a water supply pipe 3 so that city water can be supplied into the main tank 1, and the tip of the water supply pipe 3 faces the main tank 1. A hot water supply pipe 5 is provided so that hot water heated in the sub tank 2 can be supplied from the upper portion of the sub tank 2.
Has been derived. The hot water supply pipe 5 has its tip connected to the lower part of the sub tank 2, and a circulation pipe line 6 is formed from the upper part to the lower part of the sub tank 2. The hot water supply pipe 5 which constitutes the circulation pipe line 6 is provided with a hot water outlet portion 7 such as a calan 7a. In the illustrated embodiment, two hot water outlet portions 7 are provided. Of course, one location or two or more locations may be provided. Then, when tapping hot water, hot water in the sub tank 2 is tapped from the tapping portion 7 through the hot water supply pipe 5. Further, when the hot water is not discharged from the upper portion of the sub tank 2, the hot water in the sub tank 2 is returned to the bottom portion of the sub tank 2 in the circulation pipe line 6 and circulates. It is designed to prevent the temperature from staying low. At this time, as the circulation line 6, one hot water supply pipe 5 is made to face the lower part of the sub tank 2 as shown by a solid line in FIG. 1, or as shown by an imaginary line in FIG. In addition, even if the pipe 5a for discharging hot water from the sub tank 2 to the hot water outlet 7 and the pipe 5b for returning hot water from the hot water outlet 7 to the sub tank 2 are integrated as one pipe, Good. In this case, both pipe lines 5a and 5b are integrated as shown in FIG. 2 so that an extra installation space is not taken up. Then, when hot water is discharged from the hot water discharge part 7, a pipe line 5a from the sub tank 2 to the hot water discharge part 7
The hot water in the conduit 5b from near the hot water outlet 7 to the sub tank 2 is supplied to the hot water outlet 7 in a backflow state while the hot water is supplied from the hot water outlet 7 to the sub tank 2. Since the passage 5b is connected to the sub-tank 2, the hot water supplied to the hot water outlet 7 via the pipe 5b is also at a high temperature, and the temperature of the hot water discharged does not decrease. A temperature sensor (not shown) in the main tank 1
The temperature sensor detects the hot water temperature and turns on and off the heater 4a as the heat source unit 4.

When hot water is discharged through the hot water supply pipe 5, the warm water in the main tank 1 gradually heated by heat conduction from the sub tank 2 flows into the sub tank 2 through the inflow port 2a and the outflow port 2b provided in the sub tank 2. Then, the heat source section 4 in the sub tank 2
The hot water is heated by the hot water supply pipe 5 and is discharged as hot water from the hot water supply pipe 5. At this time, the hot water flowing into the sub-tank 2 is heated by the heat source part 4. However, since only the water in the sub-tank 2 having a small capacity is heated by the heat source part 4, heating is performed. It has a small capacity and does not take much time to heat hot water, so that it rises quickly. Furthermore, the supply of water to the sub tank 2 heats the hot water in the main tank 1 that has been preheated by heat conduction from the sub tank 2. Since it is carried out in a short time, it takes less time to heat the hot water storage and the rise time is faster. When hot water is not discharged from the hot water outlet 7, hot water in the sub tank 2 circulates in the hot water supply pipe 5 that is led out from the upper portion of the sub tank 2 and connected to the lower portion of the sub tank 2.
The hot water in the circulation pipe line 6 formed by the hot water supply pipe 5 is maintained in a high temperature state, and even when a small amount of hot water is discharged from the hot water discharge part 7 or a short time of hot water is discharged, The hot water kept in a high temperature state in the circulation conduit 6 is supplied, and the hot water having a low temperature is not discharged. Further, since the hot water circulating in the circulation pipe line 6 is performed by the convection of the hot water in the small capacity sub-tank 2 in which the heat source part 4 is provided, the circulation capacity is strong and the high temperature hot water is constantly circulated. The hot water can be reliably circulated even when the hot water supply pipe 5 is long.

FIG. 3 shows another embodiment of the present invention. In this embodiment, in the embodiment shown in FIG. 1, the tip of the hot water supply pipe 5 is located below the sub tank 2. The main tank 1 is made to face the lower part. Even in the case of such a configuration, the hot water returned in the pipe line 5b will flow into the sub tank 2 through the inflow port 2a, and the hot water in the sub tank 2 will circulate in the hot water supply pipe 5. It will be. In this case, the pipe 5b from the hot water outlet 7 to the sub tank 2 has a smaller diameter than the pipe 5a from the sub tank 2 to the hot water outlet 7. That is, when hot water is discharged from the hot water outlet 7, hot water is supplied from the pipe 5a from the sub tank 2 to the hot water outlet 7, and the hot water in the pipe 5b from the hot water outlet 7 to the sub tank 2 flows backward. Although it is supplied to the hot water outlet 7, the pipe 5b from the hot water outlet 7 to the sub-tank 2 is smaller in diameter than the pipe 5a led out from the upper part of the sub tank 2 so that it is difficult to be supplied to the hot water outlet 7. , Hot water outlet 7 via pipe 5b
A large amount of warm water, which is returned to the sub tank 2 from the vicinity and has a slightly low temperature, is not supplied to the hot water outlet 7. Also,
A check valve a may be provided in the conduit 5b to obtain the same effect. Even in this case, as described above, the pipeline 5a for discharging hot water from the sub tank 2 to the hot water portion 7 and the pipeline 5b for returning the hot water from the hot water portion 7 to the sub tank 2 are provided as a single pipe. An integrated one may be used.

[Effects of the Invention] The hot water storage water heater of the present invention, as described above, derives a hot water supply pipe for supplying hot water in the sub tank from the upper part of the sub tank having a smaller capacity than the main tank provided in the lower part of the main tank, The tip of the hot water supply pipe is connected to the lower part of the sub-tank to form a circulation pipe, and a hot water outlet such as a curran is provided at an appropriate position of the hot water supply pipe that constitutes the circulation pipeline. The hot water in the sub-tank can be continuously discharged from the sub-tank via the hot water supply pipe. The hot water in the sub-tank circulates in the hot water supply pipe by convection, and the hot water in the hot water supply pipe is always kept at a high temperature. Even if there is, low temperature hot water will not be discharged. In addition, the circulation of hot water is provided inside by a heat source part and is performed via a sub-tank with a small capacity, so that a strong circulation capacity can be obtained, and even if the hot water supply pipe is long, the circulation of hot water can be ensured. Is what you can do.

In addition, even if the tip of the hot water supply pipe where a hot water outlet such as a curran is provided in a proper position is made to face the lower part of the main tank located below the sub tank, The hot water returned to the water will flow into the sub-tank through the inlet, and will circulate without staying in the hot water supply pipe, so that the hot water in the hot water supply pipe can be kept at a high temperature without becoming a low temperature. .

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is a sectional view showing an embodiment of a circulation line, FIG. 3 is a configuration view showing another embodiment, and FIG. 4 is a conventional example. FIG. 5 is a sectional view of another conventional example, in which A is a hot water storage water heater, 1 is a main tank,
2 is a sub tank, 2a is an inflow port, 2b is an outflow port, 3 is a water supply pipe, 4 is a heat source part, 5 is a hot water supply pipe, 6 is a circulation pipe line, 7 is a hot water discharge part, and 7a is a karan.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Yamada 2126 Onogi, Ueno City, Mie Prefecture Craco Ueno Research Institute, Inc. (72) Inventor Hidetomo Kawakami 2126 Onogi, Ueno City, Mie Prefecture Craco Ueno Research Institute Co.

Claims (2)

[Claims] 1. A sub-tank having a smaller capacity than that of the main tank is arranged in the lower part of the main tank, a water supply pipe for supplying water to the main tank is provided in the main tank, and water stored in the sub-tank is added to the sub-tank. A heat source for heating is provided, an inlet is provided at the bottom of the sub tank located in the lower part of the main tank for inflowing the water stored in the main tank, and an outlet is provided at the top of the sub tank for outflowing the hot water in the sub tank into the main tank. A hot water supply pipe that forms a circulation pipe by providing a hot water supply pipe for supplying hot water in the sub tank from the upper part of the sub tank, and connecting the tip of the hot water supply pipe to the lower part of the sub tank to form the circulation pipe line. A hot water storage water heater characterized by being provided with a hot water outlet such as a curran at an appropriate position. 2. A hot water supply pipe provided with a hot water discharge part such as a curran in a proper position is made to face a lower part of a main tank located below the sub tank. Hot water storage water heater.