JPH0711327Y2 - Heat transfer tube made of synthetic resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a flexible heat transfer tube made of synthetic resin, which is used as a snowmelter installed on a solar heat collector or a roof.

[Prior art]

Generally, this type of tube is formed of a pipe having a circular cross section such as vinyl chloride, and the pipe is fixed to the base surface via a metal fitting. Also, because the tube uses hard vinyl chloride,
A plurality of straight tubes were arranged in parallel, and a U-bend tube was connected between them to form an overall meandering shape. Therefore, there is a drawback that installation of the tube is troublesome and relatively expensive. In addition, the liquid inside the tube may freeze in the winter and may burst.

The heat exchanger described in the microfilm of Japanese Utility Model Publication No. 49-30944 has a flexible tube formed in a flat shape with a semicircular cross section, and a flat contact wall is provided on the diameter line portion. Is proposed. And an embodiment is shown in which it is spirally wrapped around the circumference of the pipe.

Such a semi-circular heat transfer tube does not cause much problems when bent in the thickness direction, but has a disadvantage that the radius of curvature must be extremely large when bent in the axial direction. Otherwise, the tubular body may buckle at the bent portion and the inside may be blocked. Therefore, when the conventional tubular body is installed in a meandering shape on a flat surface such as a solar heat collector or a roof, there is a drawback that the arrangement density becomes coarse.

[Means for Solving the Problems]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate the above problems and to provide a heat transfer tube made of synthetic resin which can be installed on a flat surface with high density and is easy to handle.

That is, a circular portion 1 formed of a synthetic resin extruded product having flexibility and having a circular cross-section at least half of its circumference, and a circular portion 1 formed at a portion of the cross-section circumference to have an outer diameter of approximately the same. And a seating portion 2 having a flat surface of the same width or more, and the inner circumference of the cross section is formed into a circle and cut into an appropriate length, and the seating portion 2 is fixed in contact with a flat heat transfer surface. The heat transfer tube is made of synthetic resin and is bent and meandered in the width direction of the seat 2 in the seated state.

〔Example〕

Next, each embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a sectional view of the tube 3 of the first embodiment of the present invention. The tube 3 is made of a flexible synthetic resin material such as polyethylene, vinyl chloride or synthetic rubber (EPDM rubber). The heat absorption rate can be increased by adding carbon or the like to these materials. The synthetic resin material is preferably black or a color close to black. This makes it possible to improve the solar radiation absorption rate, prevent light from passing through the inside, and prevent algae from forming inside. By extruding a synthetic resin material made of such a material, a tube as shown in FIG. 1 is formed. The tube has a circular upper cross section and a rectangular lower cross section. The inner circumference is circular. Therefore, the circular portion 1 is formed in the upper half and the flat seating portion 2 is formed in the lower half. As an example, such a tube 3 is bent in a meandering shape as shown in FIG. 4, and is fixed on a metal plate having good heat conductivity such as a copper plate with an adhesive or the like so that heat is transferred between them. Then, it can be used as a solar heat collector by pouring water inside or as a snow melting device for a roof by pouring water at an appropriate temperature inside. or,
Even if water stagnates inside and freezes, the tube is flexible and can be expanded and contracted in the radial direction, so there is no risk of the tube being damaged. In addition, a tube having a diameter of about 20 mm has good thermal efficiency, and the thickness of the tube is preferably about 1 to 3 mm in consideration of heat conductivity and strength.

Next, FIG. 2 is a cross-sectional view of a second embodiment of the present invention.
In this embodiment, the seating portion 2 is formed so as to widen toward the end and has a more stable shape.

Next, FIG. 3 is a cross-sectional view of a third embodiment of the present invention,
Both edge portions in the width direction of the seating portion 2 are formed in a flange shape. By doing so, the material of the synthetic resin can be relatively reduced and the tube 3 having a good sitting can be obtained.

[Effect of device]

The heat transfer tube of the present invention has a circular portion 1 and a seating portion 2 having a flat surface having a width substantially equal to or larger than the outer diameter of the circular portion 1. Therefore, the tube 3 can be stably attached to the flat installation surface. Moreover, since the inner circumference of the tube is formed in a circular shape and more than half of the outer circumference is formed by the circular portion 1, it is hard to buckle even if it is bent and meandered, and the tube is easy to bend and has high reliability. obtain. Therefore, the heat transfer tube of the present invention can be installed at a high density on a flat installation surface with a relatively small radius of curvature, and heat exchange performance per unit area can be improved.

Further, the heat transfer tube of the present invention is made of a synthetic resin extruded body, and is cut into an appropriate length for use. And the cutting portion is usually connected to another pipe, but since the inner peripheral surface of the heat transfer tube itself is circular,
The connection is easy, and the sealing property of the connecting portion can be kept good by using an appropriate fastener.

Therefore, the tube can be installed very easily and has excellent sealing properties. Further, since the upper surface side of the present tube is the circular portion 1, it has a good appearance and is easy to clean.

[Brief description of drawings]

1 to 3 are vertical sectional views showing respective embodiments of the tube of the present invention, and FIG. 4 is an explanatory view showing an example of a laid state of the tube. 1 ... Circular part, 2 ... Seating part 3 ... Tube, 4 ... Inner surface

Claims (1)

[Scope of utility model registration request] 1. A circular portion 1 which is made of a synthetic resin extruded product having flexibility and has a circular cross-section at least a half circumference, and an outer portion of the circular portion 1 which is formed at a part of the cross-section circumference. And a seating portion 2 having a flat surface having a width substantially equal to or larger than the diameter, the inner circumference of the section is formed into a circular shape, and the seating portion 2 is cut to an appropriate length to form a flat heat transfer surface A heat transfer tube made of a synthetic resin, which is fixed in contact and is bent and meandered in the width direction of the seat 2 in the seated state.