JPS593265Y2 - Heat exchanger - Google Patents

Description

[Detailed Description of the Invention] The purpose of the present invention is to dramatically improve the heat exchange efficiency of a double-tube heat exchanger.

Conventionally, as shown in FIG. 1, a double-pipe heat exchanger 2 and a water supply pipe 3 were provided below a hot water storage tank 1, and a hot water supply pipe 4 was provided above it.

This heat exchanger 2 includes an outer tube 6 welded to a flange 5, and an inner tube 7 provided with a certain space in between.

In other words, even if harmful heat transfer liquid 8 such as antifreeze flowing inside the inner pipe 7 leaks out due to a pinhole in the inner pipe 7, it will not mix with the drinking water in the hot water storage tank 1. This is consideration.

However, in this case, since the inner tube 7 and the outer tube 6 use an air layer as an intermediate heat medium, heat conduction is very poor, and the shape is also increased (in order to increase the heat transfer area and increase the amount of heat exchange), etc. There was an urgent need for improvement.

Next, an embodiment of the present invention will be described with reference to FIG. 2 of the accompanying drawings.

In FIG. 2, a cover 9 is provided that integrally covers the surface of the flange 5 and the outer surface of the inner tube 7.

This cover 9 has an intermediate heat medium 10 in the center from the outside to the inside.
A window glass 11 is provided for viewing the state of the heating medium, a replenishment port 12 for replenishing the intermediate heat medium 10 is provided at the top, and a drain port 13 for draining the intermediate heat medium 10 is provided at the bottom.

Therefore, an intermediate heat medium 10 such as water is provided between the inner tube 7 and the outer tube 6.
is completely filled.

To explain the difference in properties between the intermediate heat medium 10 and air, the thermal conductivities of air and water at the same temperature of 20 to 100°C are as follows.

Air: 0.0220-0.0267 Kcal 7
m −h −℃ ice water: 0.515 to 0.586 Kca
l 7m -h -°C Even if the difference in surface thermal conductivity is taken into account, there is a difference of about 20 times, and the heat exchange efficiency is significantly improved by using water, oil, etc.

Furthermore, since the embodiment includes a window glass 11, even if the colored heat medium liquid 8 leaks from the inner tube 7, it can be determined by looking at the change in color of the intermediate heat medium 10. It is.

The heat exchanger of the present invention is a heat exchanger in which a heat medium liquid for heating is circulated inside an inner tube, and a liquid to be heated is in contact with the outside of an outer tube. The space between the inner surfaces is filled with an intermediate heat medium such as water to increase the heat conduction of this space, which significantly increases heat exchange efficiency, and requires a heat exchanger to obtain the same amount of heat exchange as conventional methods. It can be made small, therefore it can be obtained at low cost, and since the structure is simple, there is no failure and high reliability, and it has a great practical effect.

In addition, the window glass, replenishment port, and liquid drain port are used to manage the liquid level of the intermediate heat medium, control deterioration and alteration of the intermediate heat medium, and check for leakage of the heat medium inside the inner pipe over a long period of time. Maintenance and management is also easy.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional heat exchanger, and FIG. 2 is a partial sectional view of a heat exchanger according to an embodiment of the present invention. 5...flange, 6...outer tube, 7...
...Inner tube, 8...Heat medium, 9...
Cover, 10... Intermediate heat medium, 12...
・Supply port, 13... Drain port.

Claims (1)

[Scope of utility model registration request] a hot water storage tank; an inner pipe protruding into the hot water storage tank through which a heating medium liquid circulates; an outer pipe that covers the inner pipe inside the hot water storage tank; a cover for sealing the outer tube, an intermediate heat medium is filled between the outer tube and the inner tube, a replenishment port for replenishing the intermediate heat medium, and a replenishment port for discharging the intermediate heat medium. A heat exchanger provided with a drain port for discharging water and a window glass for viewing the state of the intermediate heat medium.