JPH0368274B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a metal or synthetic resin tube with excellent heat storage performance.

B. Prior Art Conventionally, hot water pipes for water heaters have been heat insulating pipes in which the outer peripheral surface of a copper pipe or the like is coated with a heat insulating material such as foamed polyurethane, and the outer peripheral surface is further coated with a polyethylene film. Therefore, in the case of a water heater using this, the temperature of the hot water decreased significantly over time after the hot water supply was stopped. There is also a method of using heating wires to maintain high temperatures and prevent freezing, but this method also has the drawback of consuming electrical energy.

Furthermore, in order to reduce the drop in hot water temperature, it is necessary to thicken the heat insulating layer, which has the disadvantage of requiring a large amount of piping space.

C. Problems to be Solved by the Invention With conventional insulated pipes, the hot water temperature drops significantly and requires a thick insulating material. This is intended to achieve the effect of preventing the drop in water and reducing the piping space.

D. Means for Solving the Problems The present invention provides a method in which a heat storage material layer is wrapped around the outer peripheral surface of a pipe or a pipe whose outer peripheral surface is coated with a synthetic resin, and a heat insulating material layer is further wrapped around the outer peripheral surface of the pipe. The heat storage tube is a heat storage tube characterized in that the heat storage material layer is a porous material impregnated with a heat storage material that is sealed and packaged with a synthetic resin film or a laminate film, and if necessary, the The gist is a heat storage tube in which a non-combustible outer layer is provided on the outer peripheral surface of a heat insulating material layer.

The heat storage tube of the present invention utilizes metal pipes such as copper pipes, aluminum pipes, and steel pipes, metal pipes whose outer peripheral surfaces are coated with synthetic resins such as polyethylene, polyester, and polyamide, and synthetic resin pipes such as vinyl chloride pipes. However, generally reliable copper pipes are preferred.

The synthetic resin coating is necessary when the metal tube is made of a material that may cause electrolytic corrosion.

The heat storage material layer of the present invention is a synthetic resin film formed by impregnating an impregnable base material such as woven fabric, nonwoven fabric, paper, synthetic resin foam, etc. with sodium acetate trihydrate or paraffin as a heat storage material. In addition to this, it also refers to products that are sealed and packaged with aluminum foil, polyethylene laminate film, etc.

Note that sodium acetate trihydrate has better performance as a heat storage material than paraffin.

Furthermore, in order to obtain a heat-retaining and cold-retaining effect, foamed polyethylene, foamed polyurethane, nonwoven fabric, or the like is used as a heat insulating layer.

The heat storage tube is made by covering the outside of the heat insulating material layer with a noncombustible material such as noncombustible paper, metal foil, or metal plate, if necessary, to impart fire resistance.

The noncombustible material is preferably noncombustible paper, which is lightweight and easy to apply.

Example The present invention will be explained in accordance with the accompanying drawings.

FIG. 1 is a sectional view of a conventional heat insulating pipe, in which 1 is a copper pipe, 2 is a foamed polyurethane pipe, and 3 is a polyethylene pipe.

FIG. 2 is a sectional view of the heat storage tube of the present invention. 4
5 is a copper tube, 5 is a synthetic resin coating layer, and 6 is a heat storage material layer made of paper with a thickness of 1 m/m and a basis weight of 400 g/m ² impregnated with 300% by weight of sodium acetate trihydrate. It has a cylindrical shape with a thickness of 1.3 m/m and is sealed with a 0.15 m/m laminated film.

7 is a nonwoven fabric as a heat insulating layer, and about 8
The thickness is set to m/m.

The outer layer of No. 8 is a fireproof paper with a thickness of 1 m/m.

FIG. 3 is a diagram showing changes in water temperature in various metal pipes over time when hot water is passed through the pipes for a certain period of time.

The two-dot chain line is for copper pipe only, the one-dot chain line is for copper pipe covered with non-woven fabric, the dotted line is for 1.3 m/m, and the thick solid line is for 2.3 m/m of heat storage material.
It is a copper pipe coated with a non-woven fabric of m/m, and the heat retention time of a copper pipe coated with a heat storage material and a non-woven fabric that shows the decrease in hot water temperature over time is about three times that of a conventional copper pipe. It can be seen that the effect is significant.

Effects of the Invention In the present invention, in particular, a porous material impregnated with a heat storage material sealed and packaged with a synthetic resin film or a laminate film is used as the heat storage material layer, so that the following effects can be obtained.

Easy to manufacture.

Can be cut to any length (because the porous material is impregnated with the heat storage material, there is no leakage of the heat storage material even when cutting).

By wrapping the heat storage material around the outer circumferential surface of the tube, it comes into uniform contact with the outer circumferential surface of the tube, resulting in a large heat storage effect.

Strong against shock and no leakage of heat storage material.

Even if the heat storage material layer is wrapped around the outer peripheral surface of the vertical pipe, the heat storage material will not be biased downward.

If the heat storage tube of the present invention is used, the water temperature can be maintained at 55°C when measured approximately 1 hour after stopping the supply of hot water at 65°C at a room temperature of 20°C, and when measured approximately 2 hours later. We were able to maintain the temperature above 40℃.

Although a nonwoven fabric was used as the heat insulating layer in this measurement, if a heat insulating layer made of hard polyurethane foam or the like with a high heat retention effect is used, it is possible to prevent the temperature from decreasing for a long time. In addition, by making the heat storage material layer even thicker, a long-term heat retention effect can be obtained.

Furthermore, the diameter can be reduced to about half and the cross-sectional area to about one-quarter compared to conventional insulated pipes. As a result, piping space is also reduced.

The present invention has not only a heat retaining effect but also a cold retaining effect, and by providing a noncombustible material in the outermost layer, fire resistance can be imparted.

A major feature of the present invention is that when the heat storage pipe is used as a hot water supply pipe, hot water can be used immediately when the faucet is opened even after approximately one hour has passed after the faucet of the hot water supply equipment is turned off. It is effective in saving energy in hot water supply.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional heat insulating tube, and FIG. 2 is a sectional view of a heat storage tube of the present invention. FIG. 3 is a diagram showing changes in water temperature in various metal pipes over time when hot water is passed through the pipes for a certain period of time. 4...Pipe, 5...Synthetic resin coating, 6...Heat storage material layer, 7...Insulating material layer, 8...Nonflammable outer layer.

Claims (1)

[Scope of Claims] 1. A heat storage tube in which a heat storage material layer is wrapped around the outer peripheral surface of a tube, or a tube whose outer peripheral surface is coated with a synthetic resin, and a heat insulating material layer is further wrapped around the outer peripheral surface, The heat storage tube is characterized in that the heat storage material layer is a porous material impregnated with a heat storage material and sealed and packaged with a synthetic resin film or a laminate film. 2. The heat storage tube according to claim 1, characterized in that a non-combustible outer layer is provided on the outer peripheral surface of the heat insulating material layer. 3. The heat storage tube according to claim 1, wherein the porous material is made of woven fabric, nonwoven fabric, paper, or synthetic resin foam.