JPS6215585Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an expansion/contraction connection part of a fluid distribution pipe used for a connection part of a heat medium flow path in a solar heat collector or the like.

Generally, as shown in FIG. 1, a joint 4 is installed to branch from a header pipe 2 of a solar heat collection system 3 consisting of a heat collector 1 and a header pipe 2.
are inserted into bulge-processed end ports 5, 5 that protrude from the branching part of the heat collector 1 and the header pipe 2 (or between the heat collectors 1, etc.). In this case, the temperature of the heat medium changes every day due to the daily behavior of sunlight, and the header pipe 2
The joint 4 expands and contracts in the axial direction
receives forces in both the X and Y directions. As a result, joint 4
If metal is used, significant deformation or fatigue cracking may occur. On the other hand,
Attempts have been made to compensate for the effects of thermal stress by using various expansion joints. For example, there is a bellow frame type joint using a metal material. Although this is excellent against expansion and contraction in the Y direction, fatigue cracking occurs when expansion and contraction in the X direction is also considered, and the cost is high. There have also been attempts to use vulcanized rubber and organic rubber materials, but the former has problems with heat resistance and weather resistance, resulting in rapid aging, and the latter has drawbacks such as low elasticity and stretchability. Ta. The performance required of the joint 4 is as follows, considering that the heat medium may contain chemicals such as antifreeze in preparation for low-temperature periods, and that the heat medium may be removed and exposed to the atmosphere. It is required to have excellent fatigue deterioration resistance, chemical resistance, corrosion resistance, electrolytic corrosion resistance, ozone resistance, spreadability, etc. Furthermore, when the heat collector 1 etc. is heated dry, the header pipe 2 and end ports 5 and 5 reach a temperature of 150 to 180 degrees Celsius, so it is necessary to have excellent heat resistance, and also to prevent water leakage. Considering tests, etc., it is also necessary to have excellent pressure resistance.

Therefore, expansion joints 4 made of organic materials such as FEP, Teflon, and silicone that satisfy part of the above-mentioned performance requirements have come to be used. However, it has poor pressure resistance, and when the pressure of the internal fluid increases due to a water leakage test, etc., it bulges out, as shown in FIG. 2, and the mechanical strength of this part decreases.

In order to overcome this drawback, the present inventors first layered metal or non-metallic heat-resistant tape around the outer circumferential surface of an organic pipe to improve its mechanical strength. A connection was proposed. However, this elastic connection requires time and effort to wrap the heat-resistant tape over and over, and has extremely poor workability on ridges.

The present invention was developed as a result of various research conducted in view of the above points, and was developed by attaching a woven fiber tube to the outer circumferential surface of a pipe made of an organic material that has excellent heat resistance, weather resistance, and elasticity. This is interposed between the pipes to be connected and tightened with a tightening member to provide an expandable connection part for fluid distribution pipes that has excellent pressure resistance, flexibility, and workability, as well as excellent heat resistance and weather resistance. It provides:

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the same parts as in the prior art will be described with the same reference numerals.

FIG. 3 and FIG. 4 show an application of the expandable connection part of the fluid flow pipe according to the present invention to a solar heat collector. This expansion/contraction connection part 6 is connected between the header pipe 2 and the heat collector 1 of the solar heat collection system 3 consisting of the heat collector 1 and the header pipe 2.
It is inserted so as to cover the side wall surface 12 of the heating medium path 2 and the outer peripheral surface of the end ports 5, 5 protruding from the peripheral surface of the heat medium path 2.

The innermost layer of this expansion/contraction connection part 6 is formed of a pipe 7 made of an organic material with excellent heat resistance, weather resistance, corrosion resistance, and chemical resistance, and the end ports 5 and 5 are made of a bulge-processed copper pipe or the like. It is inserted into the outer circumferential surface of the This organic material pipe 7 is, for example,
Any material may be used as long as it is made of a material having the above properties such as FEP, Teflon, and silicone. Further, the diameter and length of the organic material pipe 7 should be determined according to the mounting position, and it is particularly desirable that the pipe 7 be in close contact with the pipe to be connected, such as the header pipes 5, 5, etc. Furthermore, its wall thickness determines the allowable pressure of the internal fluid such as the heating medium fluid by the fiber woven tube described later, and the specifications of the solar heat collection system 3 and the water pressure of the water leakage test are determined. In consideration, it is desirable to select an appropriate value within the range of 0.5 mm to 5 mm.

Further, on the outer peripheral surface of the organic material pipe 7,
A fiber woven fabric tube 8 is attached, and a tightening jig 9 is wrapped around the periphery of the fiber woven fabric tube 8.
It is fixed to the header pipes 5, 5 via an organic material pipe 7. The woven fiber tube 8 has a mesh structure made of woven fiber cloth, which increases the degree of freedom (mobility) of the elastic connection portion 6 in the axial direction Y and in the direction X orthogonal to the axial direction, and also increases the pressure resistance. It improves the workability during installation, and any material may be used as long as it has this function, such as material made of metal fibers, glass fibers, woven fabrics made from animal and plant fibers, etc. .
Further, the inner diameter of the tube 8 made of fiber woven fabric is larger than the outer diameter of the pipe 7 made of organic material, and is 3 to 10
It has a size that suppresses the expansion of the organic material pipe 7 at an internal pressure of Kg/cm ² within its expansion limit, and is perpendicular to the axial direction of the organic material pipe 7 attached to the end ports 5, 5. It is desirable that the range is within a range that provides an appropriate degree of freedom in the direction X.

Further, the tightening jig 9 includes the above-mentioned fiber woven fabric tube 8.
Any device, such as a metal fastener or a wire band made of various materials, may be used as long as it has the function of fastening the pipe 7 to the end ports 5, 5 through the organic material pipe 7.

In the expandable connection part 6 configured in this way, the permissible pressure for internal fluid such as heat transfer fluid can be increased by the fiber woven tube 8 attached to the outer peripheral surface of the organic material pipe 7. In addition, the mesh structure of the tube 8 made of fiber woven fabric provides excellent workability, and it is possible to improve workability on site.

As explained above, the expandable connection part of the fluid distribution pipe according to the present invention has excellent pressure resistance, flexibility, and workability during installation due to the network structure of the fiber woven tube, and also has excellent pressure resistance, flexibility, and workability during installation. Therefore, it has effects such as excellent heat resistance and weather resistance.

Although the present invention has mainly been described with respect to the connection between the header pipe 2 and the solar heat collector 1, it is obvious that it can also be applied to the connection between the solar heat collectors 1.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a solar heat collection system equipped with a conventional expansion joint, and Fig. 2 is a partial sectional view showing the expansion joint shown in Fig. 1 expanded due to an increase in the pressure of the internal fluid. , FIG. 3 is a perspective view showing one embodiment of the telescopic connection portion of the fluid circulation pipe according to the present invention, and FIG. 4 is an enlarged sectional view of the main part of the telescopic connection portion shown in FIG. 3. 1... Solar heat collector, 2... Header pipe,
3...Solar heat collection system, 4...Joint, 6...Expansion connection, 7...Pipe made of organic material, 8...Tube made of fibrous fabric.

Claims (1)

[Scope of utility model registration request] A solar heat collector in which the pipes to be connected are connected via a pipe made of an elastic organic material with excellent heat resistance and weather resistance, and a tube made of woven fiber fabric is slidably attached to the outer circumference of this pipe. Expandable connection for fluid distribution pipes in heaters.