JPS6350617B2 - - Google Patents

Abstract

PURPOSE:To prevent partial wrinkling of a bag-like member constituting a heat exchanger element irrespective of the side positioned outward when it is rolled up, by using yarns having different coefficients of heat shrinkage for the upper and lower fabrics constituting a double structure of the bag-like member, and thereby imparting corrugation to either of the upper and the lower fabrics by the function of the difference in the coefficient of heat shrinkage. CONSTITUTION:In a hot-water circulating type floor heating apparatus or the like, an upper fabric 10 of a bag-like member is made flat or plane 32 while a lower fabric 20 is gently corrugated 31. That is, warp 11 having a high coefficient of heat shrinkage is used for the upper fabric 10 of the double structure while warp 21 having a low coefficient of heat shrinkage is used for the lower fabric 20. Or otherwise, the double-structure of the bag-like member can be made by using the warps 11, 21 vice versa for the upper and the lower fabrics. The double-structural body having an upper fabric and a lower fabric, one imparted with corrugation and the other being flat, can be obtained by using warps having different coefficients of heat shrinkage for the upper fabric 10 and the lower fabric 20 and then subjecting them to heat treatment while storing the above factors in memory.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a planar heat exchanger element used in hot water circulation type floor heating systems and other heating systems.

Planar heat exchanger element (hereinafter simply "heat exchanger element")
) is usually used in connection with a heat medium circulation device, etc. The heat exchanger element passes a heat medium, such as water, sent from a heat medium circulation device or the like through the heat exchanger element, and performs heating by exchanging heat.

The structure of a conventional heat exchanger element was as follows. That is, as shown in FIG. 1 and FIGS. 2 a to 2 c, a planar bag 1 is provided, and entrances and exits 2 and 3 are provided on the lower surface of the bag so that a heat medium can flow inside. The wall of the bag 1 has a double structure consisting of a top sheet 4 and an inner sheet 5. Generally, the top sheet 4 is made of a material such as rubber or resin that does not allow heat medium to pass through, and the inner sheet 5 is made of woven fabric or the like. The top sheet 4 and the inner sheet 5 are usually fixed together by welding or gluing. A spacer 6 is provided inside the bag 1 to provide a predetermined distance between the upper and lower fabrics of the bag 1 and to ensure that the bag 1 has appropriate elasticity in the vertical direction. This spacer 6 is made of, for example, two types of monofilaments woven in a net shape, namely a wave monofilament 7 that undulates up and down, and a linear monofilament 8 that intersects perpendicularly thereto.
... (a corrugated reticulated fabric), or simply a corrugated monofilament 7 that undulates up and down. In the case of the corrugated reticulated fabric, the linear monofilaments 8 are woven parallel to each other and at different heights depending on the waveform of the corrugated monofilaments 7.
On the other hand, the respective waveform monofilaments 7 are also parallel to each other, forming a so-called parallel weave.
The corrugated monofilament 7 is undulated vertically so as to weave through the upper and lower inner sheets 5, so that its peaks 71 and troughs 72 are exposed outside the inner sheet 5. In this way, the bag 1 maintains a predetermined thickness and is less likely to swell.

In such a heat exchanger element, the upper and lower fabrics of the bag body 1, that is, the upper and lower inner sheets 5, 5',
The corrugated monofilament 7, which is sewn into the upper and lower inner sheets 5 and 5' at the crests and troughs of the waves while undulating in a waveform, is preliminarily formed as an integral double structure as shown in FIG. It is woven. Then, for the upper and lower inner sheets 5, 5' in such a double structure, rubber, which becomes the top sheets 4, 4' explained in FIG.
The bag body is made by coating each bag with resin or other materials.

The upper and lower fabrics 5, 5' of the double structure are
As shown in Figures a and b, in the already woven state, the fabric has a wavy shape with gentle irregularities following the waveform of the monofilament 7, which is the spacer 6.

Therefore, these are usually subjected to heat treatment for the following purposes.

Smooth the surface (remove corrugations) to improve product value.

Prevents shrinkage due to heating when coating resin etc. on the surface and improves workability.

However, in the conventional double structure, the upper fabric and the lower fabric have the same heat shrinkage rate, so after the heat treatment, both the upper fabric 10 and the lower fabric 20 shrink as shown in FIG. 3c. Finishes in a flat shape without uneven corrugations. For this reason, not only when this double structure is directly rolled, but also when it is coated with a top sheet to form a bag, the difference in curvature between the upper fabric 10 and the lower fabric 20 cannot be fully absorbed, and the 4
As shown in the figure, creases 30 occur locally in the inwardly wound portion. This fold wrinkle 30
Since this does not easily recover, it affects not only double-layered structures but also coated products (bags), significantly reducing their commercial value.

This invention was made in view of the above circumstances, and uses threads with different heat shrinkage rates for the upper and lower fabrics of the double structure that makes up the bag body of the heat exchanger element. By applying a wave shape to one side due to the difference in heat shrinkage, the upper and lower fabrics of the bag body are rolled up on either side without causing any partial creases, resulting in excellent heat exchange with excellent commercial value in terms of appearance. It provides a container element.

The heat exchanger element according to the present invention is made using a double structure that is separated by a spacer provided between upper and lower fabrics to maintain a predetermined distance, and is bent (folded or A planar heat exchanger element comprising a bag body that can be rolled up (e.g., rolled up), and provided with an inlet/outlet so that a heat medium can flow inside the bag body, wherein either one of the upper and lower fabrics has a wavy shape, It is characterized by the fact that the other side is flat.

Below, based on the embodiments shown in the drawings,
This invention will be explained in detail. FIG. 5 shows an example of a cross-sectional view of a double structure used to make a bag for a heat exchanger element according to the present invention. Although FIG. 5 shows an example in which the spacer does not use a linear monofilament, the dual structure of the heat exchanger element according to the present invention is limited to one without a linear monofilament. It's not a thing.

As shown in FIG.
1 is formed.

Such a double structure is manufactured, for example, as follows.

That is, the warp threads 11 used in the upper fabric 10 of the double structure are those with a high heat shrinkage rate, and the warp threads 21 used in the lower fabric 20 are those with a low heat shrinkage rate. Alternatively, a double structure may be created by setting the heat shrinkage rates of the warp threads of the upper and lower fabrics in a relationship opposite to that described above. Here, the relationship between the heat shrinkage rates of the warp threads used for the upper and lower fabrics is not particularly limited to one being always large and the other always being small.

In this case, the fabric on the side that exhibits a wavy shape depends on various factors such as the size of the radius of curvature, the type of coating resin, the weaving density, the fiber material, and the fineness when the double structure or its coating, that is, the bag, is rolled up. Since the extent to which the fabric absorbs the difference in radius of curvature also differs, the difference in heat shrinkage rate between the upper and lower fabrics should be selected taking these factors into consideration. A double structure in which one of the upper and lower fabrics is wavy and the other is flat is made by heat-treating the upper fabric 10 and the lower fabric 20 by placing warp threads with different heat shrinkage rates in consideration of these factors. It can be obtained by

As for the heat treatment conditions, the conditions (temperature and time) may be selected to sufficiently form undulations due to the difference in yarn length due to the difference in heat shrinkage rate on one of the upper and lower fabrics, taking into consideration the material used, weaving density, etc.

In the heat exchanger element according to the present invention, there is no particular limitation on the method of making the double structure as long as it exhibits the above-mentioned state.

The double structure constituting the bag of the heat exchanger element according to the present invention is not different from the conventional structure shown in FIGS. 3a and 3b before heat treatment, that is, at the beginning of weaving, When the fabric is exposed to the fabric, one of the upper and lower fabrics becomes wavy and the other becomes flat, as shown in FIG. Therefore, if the upper fabric 10 is rolled on the outside, the 6th
As shown in the figure, the curvature of the uneven waves of the lower fabric 20 gradually increases (the radius of curvature becomes smaller) to absorb the difference in curvature of the upper fabric 10.
Since it is rolled up in this way, local wrinkles will not occur.

If the upper fabric 10 is rolled inside, the 7th
As shown in the figure, the curvature of the uneven waves of the lower fabric 20 gradually decreases (the radius of curvature increases) to absorb the difference in curvature with the upper fabric 10. Therefore, local wrinkles do not occur after winding up.

In this way, even if this double structure is rolled up with either the upper or lower fabric facing inside, no partial fold wrinkles will occur. Therefore, even if the upper and lower fabrics of this double structure are coated with resin or the like to form a bag, wrinkles will not occur on the surface of the bag, and the bag will have a very smooth surface. It has an excellent appearance and commercial value.

That is, the heat exchanger element according to the present invention equipped with such a bag always has a smooth surface that is resistant to folding and wrinkles, and has an excellent appearance.

In this invention, the embodiment of the bag has been described with respect to woven fabrics, but this idea can be similarly applied to knitted fabrics and other fabrics.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view with a part of the heat exchanger element cut away, Fig. 2a is a perspective view of a conventional bag body with a part cut away, and Fig. 2b is an A--
Figure 2c is a sectional view taken along line A', Figure 2c is a sectional view taken along line B-B' in Figure 3a, and Figure 3a is a perspective view showing the shape of the conventional double structure that makes up the bag after weaving. ,
Figure 3b is a cross-sectional view taken along the line C-C' in Figure 3a, Figure 3c is a cross-sectional view of the double structure after heat treatment in Figure 4
The figures are an explanatory diagram of folding wrinkles when the double structure shown in FIG. 3c is rolled up, FIG. 5 is an explanatory view of the double structure shown in FIG. 5 being rolled up with its wavy portion facing inside, and FIG. 7 is an explanatory view of the double structure of FIG. 5 being rolled up with its wavy portion facing outside. 1...Bag body, 10...Top fabric, 11...Top fabric warp thread, 20...Bottom fabric, 21...Bottom fabric warp thread, 30...Fold wrinkle, 31...Wavily, 32...
Planar, X...vertical direction, Y...horizontal direction, 4,
4'...Top sheet, 5,5'...Inner sheet, 6
...Spacer, 7...Corrugated monofilament.

Claims (1)

[Claims] 1. A bag made of a double structure separated by a spacer provided between upper and lower fabrics to maintain a predetermined distance, and equipped with a bendable bag body. , a planar heat exchanger element in which an inlet/outlet is provided to allow a heat medium to flow inside the bag,
A planar heat exchanger element characterized in that one of the upper and lower fabrics is wavy and the other is flat. 2. The planar heat exchanger element according to claim 1, wherein the warp threads of the upper and lower fabrics of the double structure are yarns having different heat shrinkage rates, and the upper and lower fabrics are heat-treated.