JPH0539331Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a heat exchanger tube for a heat exchanger.
In particular, it relates to heat exchange tubes that can handle low-temperature cold water with floating ice.

(Problems to be solved by conventional technology and ideas) Conventionally, in order to obtain a heat source for air conditioning equipment, etc., it has generally been done to utilize the atmosphere, etc., and collect or radiate the heat through a refrigeration cycle. There is.

When water is used as a heat transfer medium in the evaporator (hereinafter referred to as heat exchanger) of a conventional refrigerator, when the outside air temperature falls below 0°C and ice becomes floating, the water passed through the heat exchange heat transfer tube freezes inside the tube.

If water freezes inside the tubes, it may cause the heat exchanger tubes to burst, so to avoid this, the temperature of cold water used must be kept at 5℃ or higher, or there is no risk of freezing inside the tubes with brine. The problem was dealt with by adding antifreeze solution.

However, when cold water of 5° C. or higher is used, even if the exchanged heat is stored in a heat storage tank, a sufficient temperature difference cannot be achieved, so the heat storage capacity is limited. This is also unsatisfactory from the viewpoint of reducing the conveying power by utilizing a large temperature difference.

If a brine solution or antifreeze solution is used as a heat exchange liquid, it is difficult to manage the solution, and it is necessary to exchange heat through a heat exchanger to make it into circulating water. It was hot and labor-intensive, and the overall efficiency was reduced because the difference in temperature used was reduced.

In addition, a flexible tube with both ends sealed and fins wound around the outer circumference is inserted into the heat exchange tube of the heat exchanger to prevent the heat exchange tube from bursting if the water inside the tube freezes. Some ideas have been proposed to avoid this, but if the water in the pipes freezes, the water flow in the pipes stops and the heat exchanger loses its function.

(Means and effects for solving the problems) The inventor of the present invention, as a result of intensive research in view of the problems in the previous term,
Heat exchanger tubes will not freeze and burst even if low-temperature cold water with floating ice at around 0°C is circulated, and the circulating water in the heat exchanger tubes will not be cut off due to freezing. Developed an exchange heat transfer tube.

In other words, the present invention is a heat exchange heat exchange tube in which low-temperature cold water is circulated so that ice is floating. This is a heat exchanger tube compatible with low-temperature cold water, characterized in that an inner tube is inserted and a non-icing coating layer is provided on the inner surface of the heat exchanger tube.

Further, it is more preferable that the inner tube is provided with holes communicating with the outer circumferential surface at various places.

In this invention, the inner tube is made of rubber and has elasticity, and there is a space formed by long holes in the inner tube, so that when the water inside the tube freezes and expands in volume, However, as a result of absorbing it, the heat exchanger tube will not burst.

In addition, since the inner tube has long holes penetrating to both ends, even if the water in the tube between the heat transfer tube and the inner tube freezes, the long holes penetrating the inner tube act as a water passage. This solves the problem of the prior art in which the water flow in the pipes stops and the heat exchanger loses its function.

Furthermore, since a non-icing coating layer (for example, Teflon coating) is provided on the inner surface of the heat exchanger tube, ice is difficult to adhere to and precipitate on the inner surface of the heat exchanger tube, and even if ice forms, it will be carried away with the flowing water. Ensures smooth circulation of cold water.

Furthermore, in cases where the inner tube has holes connected to the outer circumferential surface in places, the temperature inside the heat exchanger decreases and the water in the tube freezes from the inner surface of the heat exchanger tube toward the inner tube. In this case, water flow is maintained inside and outside the inner tube, which is preferable.

In addition, the outside of the inner tube is of a different shape,
For example, as shown in FIGS. 1 and 2, since swirling fins are provided, turbulent flow can be imparted to the circulating water, ice that has adhered to the inside of the pipes can be peeled off and washed away, and the heat exchange efficiency can also be increased.

An embodiment of the present invention will now be described with reference to the drawings.

FIG. 1 is a perspective view of an inner tube according to an embodiment of the present invention, FIG. 2 is a perspective view of a heat exchange tube into which the inner tube is inserted, and FIG. 3 is a perspective view of a heat exchange tube using the heat exchange tube of this embodiment. It is a schematic diagram of a tubular heat exchanger.

In the drawing, 1 is a heat exchanger tube, 2 is a non-icing coating layer, 3 is an inner tube, 3'
is a turning fin, 4 is a through hole, 4' is a connecting hole, 5 is a multi-tubular heat exchanger, 6 is a header, 7 is a cold water inlet,
7' is the outlet, 8 is the brine (or refrigerant liquid) inlet,
8' indicates each outlet.

In this example, heat exchange tubes 1 were attached to a multi-tubular heat exchanger 5 shown in FIG.

There are headers 6, 6' at both ends of the heat exchanger 5,
The open ends of the heat exchange tubes 1 are connected to both the left and right headers 6, 6', and the left header 6 is provided with a cold water inlet 7, and the right header 6' is provided with a cold water outlet 7'.

The outer periphery of the large number of heat exchange tubes 1 is brought into contact with the brine (or refrigerant liquid) flowing in from the brine (or refrigerant liquid) inlet 8, and heat is exchanged with the cold water in the heat exchange tubes 1. The brine (or refrigerant liquid) is then removed from the outlet 8' (in the case of refrigerant liquid, refrigerant gas is removed).

In this embodiment, as shown in FIG. 1 and FIG.
A rubber inner tube 3 having a stretchable elastic material is inserted therethrough.

The inner tube 3 is provided with holes and connecting holes 4', which are connected to the outer circumferential surface of the inner tube 3, at certain places, and a turning fin 3' is provided in a protruding manner. moreover,
The inner surface of the heat exchange tube 1 is coated with a Teflon coating layer (non-icing coating layer) made of a non-icing material.
2 is formed.

In such a multi-tubular heat exchanger 5, low-temperature cold water with floating ice is circulated, and when the temperature further decreases and the water in the heat exchanger tubes 1 freezes, it becomes ice. The inner tube 3 shrinks in volume to compensate for the expansion, and is compressed together with the long hole space inside, absorbing the solid volume expansion due to ice formation. Since no force is applied, its destruction is largely avoided.

The technology of the present invention can also be applied to preventing water pipes from bursting in cold regions, and it is also preferable to apply the present invention to water pipes where freezing is expected, for example.

(Effects of the invention) As described above, the present invention is a heat exchanger tube in which low-temperature cold water with floating ice is circulated, and the heat exchanger tube has an irregularly shaped protrusion on the outer periphery, and the inside extends to both ends. This is a heat exchanger tube compatible with low-temperature cold water, in which a rubber inner tube with long holes is inserted, and a non-icing coating layer is provided on the inner surface of the heat exchanger tube.The inner tube itself has elasticity. In addition, since there is a space formed by a long hole in the inner tube, even if the water in the tube freezes and expands in volume, it is absorbed and the heat exchanger tube does not burst.

In addition, since the inner tube has long holes penetrating to both ends, even if the water in the tube between the heat transfer tube and the inner tube freezes, the long holes penetrating the inner tube act as a water passage. This solves the problem of the prior art in which the water flow in the pipes stops and the heat exchanger loses its function.

Furthermore, since a non-icing coating layer (for example, Teflon coating) is provided on the inner surface of the heat exchanger tube, ice is difficult to adhere to and precipitate on the inner surface of the heat exchanger tube, and even if ice forms, it will be carried away with the flowing water. Ensures smooth circulation of cold water.

Furthermore, in cases where the inner tube has holes connected to the outer circumferential surface in places, the temperature inside the heat exchanger decreases and the water in the tube freezes from the inner surface of the heat exchanger tube toward the inner tube. At this time, water flow is maintained both inside and outside the inner tube.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an inner tube according to an embodiment of the present invention, Fig. 2 is a perspective view of a heat exchanger tube in which the inner tube is inserted, and Fig. 3 is a perspective view of a heat exchanger tube using the heat exchanger tube of this embodiment. It is a schematic diagram of a shell-and-tube heat exchanger. In the figure, 1... Heat exchange heat transfer tube, 2... Anti-icing coating layer, 3... Inner tube, 3'...
...Swivel fin, 4...Long hole, 4'...Connecting hole, 5
...Multiple tube heat exchanger, 6...Header, 7...Cold water inlet, 7'...Outlet, 8...Brine (or refrigerant liquid) inlet, 8' outlet.

Claims (1)

[Claims for Utility Model Registration] (1) In a heat exchange heat exchange tube in which low-temperature cold water with floating ice is circulated, the heat exchange heat exchange tube has an irregularly shaped protrusion on the outer periphery and penetrates inside to both ends. 1. A heat exchanger tube compatible with low-temperature cold water, characterized in that a rubber inner tube having long holes is inserted therein, and a non-icing coating layer is provided on the inner surface of the heat exchanger tube. (2) The exchange heat transfer tube compatible with low-temperature cold water according to claim 1, wherein the inner tube has holes communicating with the outer peripheral surface at some places.