WO2008034329A1 - A u-shaped solar heat-collecting tube - Google Patents

Abstract

A U-shaped solar heat-collecting tube comprises an outer tube (1) and an inner tube (2). The exterior surface of the inner tube (2) is coated with a solar heat absorbing film (6). A metal heat-conducting tube (5) is installed inside the inner tube (2) along the axial direction, and a heat-transfer fin (3) is mounted on the metal heat-conducting tube (5). The metal heat-conducting tube (5) is a copper-aluminum composite tube, its outer layer is made of aluminum and the inner layer is made of copper.

Description

 U-tube type solar collector i tube

Technical field

 The utility model relates to a υ-type tubular solar collector tube. Background technique

 The existing common all-glass vacuum heat collecting tube is coated with a solar heat absorbing film on the outer surface of the inner tube, and the tube is filled with a heat transfer medium, generally water, and the heat energy absorbed by the solar energy absorbing film is converted and conducted through the heat transfer medium. Give the water in the hot water tank its temperature. The all-glass vacuum heat collecting tube has a large amount of heat transfer medium filled in the inner tube, and the amount of hot water can be reduced, not only can not transfer heat quickly, but also when the outside temperature is lower than the temperature inside the heat transfer medium at night, it is easy to cause The heat is lost. Moreover, the heat output end temperature is low, which greatly affects the application of solar thermal utilization.

 In order to solve the above problems in the conventional ordinary all-glass vacuum heat collecting tube, a heat collecting tube in which a metal heat transfer tube with heat transfer fins is added in the inner tube has been designed. There are two kinds of metal heat pipes mentioned above: one is a metal heat pipe made of a copper pipe body and aluminum heat transfer fins. The metal heat pipe is made of a separate body and a heat transfer fin. The heat transfer fins cannot be in close contact with the pipe body, so the heat can not be transferred to the pipe body well; the other is that the heat transfer fins and the pipe body adopt an aluminum integrated structure, although the heat transfer performance is good, the amount is due to the aluminum The corrosion resistance is very poor, so the service life is not long, especially in the environment with poor water quality. In addition, the process of integrated production is more complicated. Summary of the invention

 The utility model solves the problems existing in the prior art mentioned above, and provides a υ-type tubular solar collector tube capable of improving the utilization rate of hot water and the heat conduction speed.

 The utility model is improved on the basis of the existing υ type vacuum heat collecting tube, and the technical proposal thereof is: a υ type tubular solar heat collecting tube, comprising an outer tube and an inner tube, the outer surface of the inner tube is coated with solar energy The heat absorbing film is provided with a metal heat pipe in the axial direction of the inner tube, and the tube body is provided with heat transfer fins, the metal heat pipe is a copper-aluminum composite pipe, the outer layer is an aluminum pipe, and the inner layer is a copper pipe.

The metal heat pipe can also be made of an aluminum pipe body, and the inner wall of the pipe is compounded with copper or other high temperature resistant anticorrosive material such as Teflon. The metal heat pipe is composed of two symmetrically arranged pipe bodies, and the heat transfer fins on the pipe body are equal in length to the pipe body.

 The utility model is easy to manufacture, has good thermal conductivity and corrosion resistance. Moreover, since it is equivalent to a heat collector, it will break through the installation mode of the traditional solar water heater in the installation mode, and can be inserted, inserted, inserted, or even combined with the building to form a circular arc collector. . DRAWINGS

 Figure 1 is a schematic view of the structure of the present invention.

 Fig. 2 is an enlarged cross-sectional view taken along line A-A of Fig. 1.

 Figure 3 is a schematic view of the gas block of the present invention. detailed description

 Referring to Figure 1, the utility model comprises an outer tube 1 and an inner tube 2, the outer surface of the inner tube 2 is coated with a solar heat absorbing film 6, and the inner tube 2 is provided with a metal heat pipe 5 in the axial direction. The metal heat pipe 5 is composed of two left and right symmetrically arranged pipe bodies, and the heat transfer fins 3 which are equal in length to the pipe body are symmetrically distributed on the pipe body, and the heat transfer fins 3 are integrally formed with the pipe body of the metal heat pipe 5 . In order to facilitate molding and good corrosion resistance, the tube of the metal heat pipe 5 can be in one of two forms:

 The first is the combination of aluminum tube and copper tube. The outer tube is aluminum tube, which is easy to form. The inner tube is copper tube, which has good thermal conductivity. The second is aluminum tube, composite copper inside the tube wall or other high temperature resistant corrosion protection. material.

 The metal pipe heat pipe 5 of the utility model is used for water walking and communicates with the metal heat pipe of the adjacent heat collecting pipe. The space between the inner tube 2 and the metal heat transfer tube 5 is filled with air. To prevent heat leakage, a gas block 4 corresponding to the cross-sectional shape of the metal heat transfer tube is provided at the nozzle of the heat collecting tube.

Claims

Claim 1. A U-shaped tubular solar collector tube, comprising an outer tube and an inner tube, wherein an outer surface of the inner tube is coated with a solar heat absorbing film, a metal heat pipe is arranged in the inner tube, and a heat transfer is arranged on the tube body. The fin is characterized in that the metal heat pipe is a copper-aluminum composite pipe, the outer layer is an aluminum pipe, and the inner layer is a copper pipe.  2. The U-tube type solar heat collecting tube according to claim 1, wherein the metal heat conducting tube is made of an aluminum tube body, and the inner wall of the tube is compounded with copper or other high temperature resistant anticorrosive material with good thermal conductivity.  The U-tube type solar heat collecting tube according to claim 1 or 2, wherein the metal heat transfer tube is composed of two left and right symmetrically arranged tubes.  A U-tube type solar heat collecting tube according to claim 1 or 2, wherein the heat transfer fins on the metal heat transfer tube body are as long as the tube body.  The U-tube type solar heat collecting tube according to claim 1 or 2, wherein the nozzle of the inner tube is provided with a gas blocking ring adapted to the sectional shape of the metal heat transfer tube.  A U-tube type solar heat collecting tube according to claim 1 or 2, wherein the heat transfer fins are integrally formed with the metal heat transfer tubes.