JPH018910Y2 - - Google Patents

Description

[Detailed explanation of the invention] (1) Industrial application field This invention relates to a circulating hot water storage tank.

(2) Conventional technology Conventionally, this type of hot water storage tank was
The one disclosed in Publication No. 37877 is known,
If this cannot be made into a large size when transported to the installation location in a building, etc.,
As shown in Figure 1 A and B, multiple hot water storage tanks 31 and 3
1' are placed side by side in the horizontal direction A or the vertical direction B, water is supplied in parallel to each hot water storage tank 31, 31' through a water supply pipe 32, and hot water is taken out from each through a hot water supply pipe 33. Note that 34 is a pipe that supplies a heat source such as high-temperature gas, steam, hot water, or electric power to a heating member 35 made of a coil, and 36 is a heat exhaust pipe that discharges the heat source.

In the above-mentioned system, water is supplied from the water supply pipe 32 by a water tank located at a high place (not shown), and the hot water is thereby pushed up and taken out from the hot water supply pipe 33, and is therefore used. Water is replenished by the amount of hot water, and at this time the heating member 3
5 is designed to automatically stop its operation when the water temperature rises above a preset temperature.

(3) Problems to be solved by the invention By the way, in the above system, hot water is boiled separately in separate hot water tanks 31 and 31', but when hot water is taken out from the hot water pipe 33, In addition to the fact that the amount of hot water taken out from the nearby hot water storage tank 31'a and hot water storage tank 31ro is larger than that from the other hot water storage tank 31a and hot water storage tank 31'ro, and hot water cannot be taken out evenly, The amount of water that is replenished by the amount of hot water taken out and used is also larger than that to the hot water storage tanks 31'a and 31'ro. The balance is disrupted, and as a result, the temperature of the hot water in each hot water tank 31, 31' is different, and the temperature of the hot water in each hot water tank 31, 3
It becomes very difficult to obtain hot water of uniform temperature from 1', and the temperature of the hot water becomes unstable, and when a large amount of hot water is taken out, make-up water is supplied and the heating member 35 operates to heat the water. There was a problem that the temperature of the hot water dropped significantly. In addition, each hot water storage tank 31, 31' includes a heating member 35, which is usually made of copper, and the tank body is made of iron, which is a dissimilar metal, so corrosion problems occur and maintenance is difficult. There were problems in that it was time-consuming and economically disadvantageous.

Therefore, this invention eliminates the drawbacks of the conventional methods as described above, and can maintain the temperature of the hot water to be taken out at a nearly uniform temperature without causing variations, and even when a large amount of hot water is used. To provide a circulating hot water storage tank capable of reducing the temperature drop of hot water during heating from the stop of operation of a heating member to the start of operation and heating, and which does not cause the troublesome problem of corrosion due to the heating member.

(4) Means for solving the problems In order to solve the above-mentioned problems, this invention is characterized by adopting the following configuration. That is, an auxiliary tank that does not have the heating member and the water supply port in the upper part of the main tank, which has a heating member installed inside one side and a water supply port with an opening facing the heating member in the lower part of the other side. A water riser pipe is installed on one side above the heating member of the auxiliary tank and opens above the bottom wall thereof, and a water riser pipe that opens above the bottom wall of the auxiliary tank is provided on the other side of the main tank. A downwater pipe that opens near the water supply port is provided, the main tank and the auxiliary tank are separably connected via a communication pipe that communicates with the water riser pipe and the downdown pipe, and the hot water supply port is provided on the top wall of the auxiliary tank. A conduit is provided, and the inlet faces the opening of the water supply port and the outlet opens below the heating tube, and water is circulated through the conduit from the inlet to the outlet. A pump is installed to operate the system.

(5) Embodiments Hereinafter, embodiments of this invention will be specifically described with reference to the drawings.

Reference numeral 1 denotes a main tank, in which a heating member 3 is installed inside one side as in the conventional tank, a communication pipe 8 that opens on the top wall above it is attached, and a water supply port 4 is installed at the bottom on the opposite side. is installed, and the opening of this water supply port 4 is bent toward the heating member 3.

An auxiliary tank 2 is installed above the main tank 1 via a connecting frame 9, and within this auxiliary tank 2 is provided a riser pipe 5 that is connected to a communication pipe 8 and opens above the bottom wall of the auxiliary tank 2. A communication pipe 10 that opens on the bottom wall on the opposite side is attached, and a downcomer pipe 6 that is installed in the main tank 1 and opens near the water supply port 4 below the top wall is connected to the communication pipe 10. 7 indicates a hot water supply port provided on the top wall of the auxiliary tank 2 almost above it.

Furthermore, 11 is a heat source supply pipe similar to the supply pipe 34, and is provided with a control valve 13 that is controlled by a temperature sensing member 12 disposed in the main tank 1, and 14 is a heat source entry/exit chamber. A heat exhaust pipe 15 is attached. Reference numeral 16 denotes a circulation pump integrated with a driving motor provided outside the bottom of the main tank 1, and its suction pipe 17 connects to the water supply port 4.
The discharge pipe 18 extends horizontally below the heating member 3 and is provided with a discharge port for discharging water toward the heating member 3. The pump 16 operates in synchronization with the heating member 3 while the heating member 3 is in operation, and circulates the water at the bottom of the main tank 1 to help prevent the generation of dead water.

Note that 19 and 20 are manholes for the tanks 1 and 2, and 21 is an expansion port for the auxiliary tank 2.

The operation of the above will be explained.

The water supplied from the water supply port 4 and filling both the main and auxiliary tanks 1 and 2 is heated by the heating member 3, rises in the water riser pipe 5, and flows into the auxiliary tank 2 above the bottom wall of the tank 2. to go into. On the other hand, water in the auxiliary tank 2 on the opposite side descends through the downcomer pipe 6 and enters the main tank 1 below the top wall thereof. In this way, as the temperature near the heating member 3 increases, the main tank 1 and the auxiliary tank 2
This causes a temperature difference in water, and rapid water convection occurs between both tanks 1 and 2.

As a result of such convection, when the temperature difference between the water in both tanks 1 and 2 becomes smaller, the convection also slows down, and the water near the heating member 3 becomes hotter than the other water, and when it reaches the temperature set in the temperature sensing member 12. , the control valve 13 acts to stop the supply of the heat source, and the heating by the heating member 3 is stopped. Even after this heating is stopped, the main tank 1
The temperature of the water near the heating member 3 in the auxiliary tank 2
As long as the temperature of the water is higher than that of the water, natural convection will continue, and the water in both tanks 1 and 2 will thus have a substantially uniform temperature.

In this case, it is preferable to set the temperature of the temperature sensing member 12 to 60°C, for example, so that when the heating member 3 stops operating, the water temperature at the upper part of the auxiliary tank 2 will be around 55°C; This is done by adjusting the diameters of the water tube 5 and the downcomer tube 6.

When the hot water stored in the hot water tank in this way is taken out from the hot water supply port 7 and water is supplied from the water supply port 4,
The same operation as above is repeated again.

(6) Effects of the device Since this device is configured as described above, the high temperature water heated by the heating member of the main tank flows from the upper opening of the riser pipe to the upper part of the auxiliary tank, and also inside the auxiliary tank. Cold water is supplied to the lower part of the main tank from the lower opening of the downcomer pipe, which opens near the bottom wall of the main tank on the opposite side of the riser pipe and near the water inlet; Since the water is forced to circulate from the inlet to the outlet of the pipe by the operation of the pump, rapid convection is reliably generated between the lower part of the main tank and the upper part of the auxiliary tank. Convection occurs in the same way for low-temperature water, which is taken out of the auxiliary tank and supplied from the water supply port to the lower part of the main tank, because the inlet of the pipe is provided opposite the opening of the water supply port. Therefore, efficient heat exchange is performed, and the hot water taken out can be maintained at a nearly uniform temperature without causing any variation in temperature, and the convection allows the hot water to be drawn out from the hot water supply port of the auxiliary tank storing high temperature water. A large amount of hot water can be supplied, and both the main and auxiliary tanks have a large amount of hot water stored in them, so when the heating member stops operating, even if a large amount of hot water is taken out from the auxiliary tank's hot water supply port, the heating member will resume operation. The temperature drop until heating is extremely small, and the heat capacity is large due to the large amount of hot water stored, and the communication section between both tanks is constricted by the communication pipe, so a large amount of hot water can be drawn from the auxiliary tank as described above. Even if low-temperature water is taken out from the main tank to the auxiliary tank all at once, the temperature drop after the heating member stops is similarly small, and since the auxiliary tank is not equipped with a heating member, Not only does the capacity increase accordingly, but in addition to eliminating the troublesome problem of corrosion caused by heating elements, if the main tank becomes corroded, you can simply separate the main tank from the auxiliary tank and replace it with a new one. Since there is no need to replace even the auxiliary tank, there are excellent effects such as lower equipment maintenance costs.

[Brief explanation of the drawing]

FIGS. 1A and 1B are diagrammatic perspective views of different types of conventional hot water storage tanks, and FIG. 2 is a front view of an embodiment of this invention. 1... Main tank, 2... Auxiliary tank, 3... Heating member, 4... Water inlet, 5... Water riser pipe, 6... Downer pipe, 7... Hot water inlet.

Claims (1)

[Scope of utility model registration request] A heating member is installed inside one side, and an auxiliary tank without the heating member and water inlet is installed at the top of the main tank, which has a water inlet with the opening facing the heating member at the bottom of the other side. A water riser pipe is provided on one side above the heating member of the auxiliary tank and opens upward from the bottom wall thereof, and the other side of the main tank is provided with a water riser pipe that is closer to the bottom wall than the top wall,
and a downcomer pipe that opens near the water supply port is provided, the main tank and the auxiliary tank are separably connected via a communication pipe that communicates with the water riser pipe and the downdown pipe, and hot water is supplied to the top wall of the auxiliary tank. have a mouth,
Further, a conduit is provided in which an inlet faces the opening of the water supply port and an outlet opens below the heating tube, and the conduit operates to circulate water from the inlet to the outlet. A circulating water boiling type hot water storage tank characterized by being equipped with a pump.