JPS60155094A - Coated copper group pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention The present invention reduces the amount of heat dissipated from coated copper pipes or copper alloy pipes used for hot water supply piping, heating piping, refrigerant piping of room air conditioners, etc. compared to conventional products, and provides coatings with high heat retention and insulation performance. Related to steel pipes or copper alloy pipes.

Copper tube or copper alloy tube (hereinafter abbreviated as copper-based tube).

] Coated copper pipes, which are coated with an appropriate resin layer on the outside, have the excellent corrosion resistance and workability (bending workability, brazing workability, etc.) of copper thread pipes, and the heat insulation and heat insulation properties of the resin coating layer. As a piping material with excellent heat retention properties, it is widely used for hot water supply, space heating, room and air conditioner refrigerants, solar systems, etc., and its usage amounts to several hundred tons per month.

Figure @'1 is a sectional view showing the structure of such a coated copper pipe, and is a coated copper pipe +I+ in which two resin coating layers are coated on the outward facing surface of the copper pipe 21. The resin coating layer basically consists of a first resin coating layer (3) which is a foam layer and a second resin coating layer (4) which is a skin layer. The heat insulator is made of foamed polyethylene, foamed polyethylene, foamed polypropylene, etc., and on the other hand, the surface layer is made to have a smooth surface, add strength,
It has the functions of 1-2 in processability and corrosion resistance, and is made of polyethylene, vinyl acetate, vinyl chloride, etc. In addition to the resin coating layer, there are two foam layers.
Some have a structure such as layered ones or only an epidermal layer. The latter is mainly applied when the insulation and heat retention effects are not so great.

It is desired from the viewpoint of energy saving to fully improve the heat retention and insulation effects of coated copper pipes with a certain structure, and as a measure to do so, Q) increase the foaming ratio to increase the thermal conductivity of the foam layer. Q) The thickness of the foam layer has been increased to fully increase the heat retention ability, and as a result, products with a foaming ratio of 60 times and a foam layer thickness of about 2Chm have been put into practical use. ing.

However, in this method, the air bubble content increases and the density decreases, resulting in a decrease in compressive strength, leading to various problems. For example, if the copper thread pipe inside is accidentally stepped on during plumbing work, it may easily be crushed, or during bending, because the strength of the abutment is low, the force to hold and restrain the copper thread pipe inside is weak. Another problem is that the tube is prone to buckling when bent. - In method q), the outer diameter of the cladding pipe becomes large, making it impossible to install piping in a narrow space, and the bending radius inevitably becomes large. t
illumination occurs. For example, in the case of underfloor piping in an apartment [1. If the outside diameter of the cladding pipe is large, it is necessary to thicken the underfloor, which in turn reduces the effective indoor space.
- This will lead to an increase in the construction cost per unit.

The present invention was developed in view of certain problems, and its purpose is to create a 1-energy material with excellent heat insulation and heat retention effects without making the resin coating layer too young or thick and without reducing the overall strength. Highly effective coated copper thread tube 1ii-There is a VC that provides it, and its features are! Regarding the invention of J1;1, the copper tube or copper alloy tube has a coating layer of the net-like body IL5 directly or via a resin coating layer outwardly, and a tape-shaped body is wound on the coating layer. The present invention is characterized in that at least one layer of a reticular heat insulating layer is provided, and at least one resin coating layer is formed on the second side of the reticular heat insulating layer.
-1: In the coated copper pipe having the structure of the first blow, on the outer cylindrical surface of the copper thread pipe and/or the outer circumferential surface of at least one layer of the resin coating layer or the net-like heat insulating layer, The problem lies in the fact that a coating layer of paint with low emissivity has not yet been formed.

Hereinafter, technical guidelines for realizing the present invention will be explained, and embodiments of the present invention will be described in detail.

Thermal insulation and heat-retaining power of coated copper pipes One effective way to increase noise is to cover the surface of the copper thread pipe with a substance that has as low thermal conductivity as possible, and various foamed plastics meet these conditions. The fact that the
It is 11ri. This foamed plastic contains many microbubbles, and because the gas (mainly air) in these bubbles has a low thermal conductivity, it has high heat insulation and heat retention ability. Incidentally, the thermal conductivity rate of plastics is generally 0.1 to 0.4Kcal/m,b,'C, and that of foamed plastics is 0.015+-0.04
Kca1. /m, h, about "c", that of air changes depending on the temperature, but for example at 80 degrees Celsius it is 0.026
Kcal/m, h, 'c. Therefore, as the foaming ratio increases, the thermal conductivity decreases and the heat retaining power increases due to the total amount of bubbles included, but from the viewpoint of strength, the higher the foaming ratio MP
As already mentioned, the larger the L, the softer it becomes, so it can easily take full compression and the tube inside will be more likely to collapse.

The present invention is not a method of increasing the foaming ratio to increase the gas retention rate in plastics as described above, but rather, The entire net-like body is interposed, and the mesh of the net-like body forms a large number of air chambers, and due to its insulating effect, the heat conduction* is kept small and the coated copper thread tube with high heat retention ability is provided. The figure and FIG. 6 show a first embodiment of the coated copper pipe, in which a net-like body (51) is applied over the entire coating layer outwardly of the copper thread tube (2), and a tape-like body (61 is placed on top of the net-like body). A winding-formed mesh heat insulating layer (71) is provided, and the space between the copper thread tube 12i and the tape-like body (61) is formed by the mesh of the mesh body fi+. [1K, 1: Divided into a large number of independent air chambers (10).

As long as the conditions such as single phase fTj of the mesh body 151, thermal conductivity as low as possible, and appropriate softness for easy formation into a cylindrical shape are satisfied. Generally, examples include resins such as polyethylene and polyvinyl chloride, natural fibers such as hemp and cotton, synthetic fibers such as nylon and vinylon, and inorganic fibers such as glass cool and asbestos. The filaments constituting the net-like body (5) may be a single solid wire, but are preferably thin single wires or fully twisted yarns. If it is a praying structure, there will be gaps between the thin single wires or threads, so the thermal conductivity of the solid wires will be low.
Heat loss due to conduction from the mesh body can be reduced.

At the intersection of the filaments, the filaments may be connected to each other, or they may simply intersect 4i above and below.

Next, the dimensional relationship of the net-like body (5) will be explained.

As shown in Figure 8, a net-like body in which the cross-section of the striations is rectangular and the mesh pattern is rectangular (considering 51 degrees, the height of the striations C the thickness of the net-like body) k h, the net ['' pattern] If the total pitch is 1 and the coating is arranged in the pitch direction of the gilt-copper pipe or the structure coating layer, the tape-shaped body (6) wound on the net-like body 15) is )° The lower surface is at the midpoint of the pitch l, and has the minimum distance X from the upper surface of the copper thread pipe, etc. X is the air chamber (
The minimum thickness of the air chamber (minimum thickness of 101° In this case, when calculating by ignoring the thickness t'if of the filament, the pitch l is given by the following formula.

"4"I;-(o, q41.-+"o,-'r-'t
<However, R indicates the entire radius of the lower surface of the net-like body (5). In addition, if the thickness t of the striae of the reticular body (5) is too small relative to the height h, the reticular body (5) will easily crush the pharynx, so a certain thickness is required, but this is a rough guideline. Assume that 3h≧t is satisfied.

Animal 9. Polyethylene,
Materials with low thermal conductivity such as resin films such as polyvinyl chloride, kraft paper, crepe paper, and cloth are used. If such a tape-like body +61' is wrapped around the net-like body (51) and the tape-like body (6) is directly coated on the whole network body (5) without cutting all the layers, the foamed resin layer described later will be directly coated on the net-like body (5). This is because the resin sag due to the foaming pressure] 7 and the thickness of the air chamber (lO) is made unnecessarily small. 8) and the material of the second resin coating layer (9) which is the skin layer,
It is equivalent to the conventional one.

In this way, in the present invention, by arranging the mesh body in the coating layer, a large number of independent air chambers are formed, and the heat insulation effect of the air in these air chambers provides a heat retention capacity equivalent to that of highly foamed glasstics. Moreover, since it is covered with a net-like material, there is no reduction in strength.

FIG. 4 shows a second embodiment of the present invention, in which all two of the reticular heat insulating layers described above are successively provided outwardly at the upper part of the copper thread tube (21), and a foam layer is provided on the upper part of the copper thread tube (21). A first resin coating layer (8) and a second resin coating layer (9) serving as a skin layer are provided. FIG.
First, a first resin-covered ω layer (Ill), which is a foam layer, is provided on top of the laminated layer 1131. In the third embodiment, between the second resin-covered layer (12j and the sixth resin-covered layer θ3) It is also possible to provide a reticulated heat insulating layer to further improve the insulation and heat retention properties.Also, in the first to sixth embodiments, the skin layer t is directly formed on the reticulated heat insulating layer without interposing a foam layer. It is also possible to form a net-like heat insulating layer by winding a tape-like material on top of several layers of the net-like material.

By the way, for the purpose of further improving the heat insulation and heat retention properties, in Examples 1 to 6 of Section 2, radiation is applied to the outer circumferential surface of the copper pipe and/or the outer circumferential surface of at least one of the resin coating layer and the reticulated heat insulating layer. A.11 It is effective to completely apply paint with a low emissivity to form a coating layer with a low emissivity. Of course, even a coated copper-based pipe that does not have a reticulated heat insulating layer and is coated entirely with one or more resin coating layers can have all the effects provided by the formation of the coating layer.

The reason why the coating layer is formed using a paint having a low emissivity is to prevent heat loss due to radiation. The reason why a foam layer or a reticulated heat insulating layer is coated on the outward L part of a copper pipe is to prevent heat loss due to heat conduction and convection. It is difficult to prevent this. Therefore, the outward surface 1c N of the copper pipe
There is a method to prevent heat loss due to radiation by applying J-, Cr plating, etc., but this method requires a large amount of equipment.
In addition to being disadvantageous in terms of cost, there is also the disadvantage that the place where plating can be applied is limited to the surface of the copper pipe. In the present invention,
Since all paints with low emissivity are used, the coating location is not limited to just the surface of the copper pipe.

That is, it is also possible to coat on various coating layers,
It is preferable that it can be increased in accordance with the number of coated mk coating layers with low emissivity. Examples of paints with low emissivity include paints containing aluminum pigments (for example, those manufactured by Silver Paint and Rock Paint). Aluminum itself has an extremely low emissivity, and the emissivity of its oxide is also low compared to the oxides of other metals, so if you paint copper-based pipes with a paint that contains aluminum pigments, you can achieve a coating with a low emissivity. It is possible to easily form a layer, prevent oxidation of copper-based pipes, completely suppress the increase in emissivity, and be effective in reducing heat loss due to radiation as much as possible.

Next, the manufacturing method of the present invention will be described in detail for the first embodiment.

FIG. 6 is a complete schematic diagram of the apparatus for manufacturing a coated copper pipe of the present invention, and shows the copper pipe (2) sent from the uncoiler (141).
) is first coated with a net-like body (
61 is coated, and then a tape-shaped body +61' is coated thereon by a tape-shaped body coating device 061, and then a foam layer coating device [117J% skin layer coating device (from 18JK, @1 resin coating layer (8 ), ff;2 resin coating layer +91 is formed.

As the mesh covering device 061, a belt-shaped mesh body 1 is used.
3. A function of relatively rotating and winding around the copper thread pipe to form a coating.
Alternatively, all the functions of coating the copper pipe while weaving the filaments into a cylindrical net-like body may be performed, which is usually done in the hose processing industry. It is used in the textile processing industry.

The tape-shaped body covering device @ (16) has the function of winding a tape-shaped body of a constant width onto the net-like body by relative rotation.

The foam layer coating device (17J, whose details are shown in FIG. 7) consists of an extruder for extruding the required foam material, and a crosshead for coating the foam material on the tape-shaped body.

If all the compressed air slightly higher than atmospheric pressure is injected into the pipe body passage space 21) of the crosshead Liu, it is possible to prevent the foam layer from expanding and hanging down at the center of the network even without the tape-like body. However, it is difficult to control the pressure of compressed air, and a tape-like body is still required to stably secure an air chamber using a net-like body.

The skin layer coating device 6ii (181 also includes the foam layer coating device (181)
It has a structure similar to lη.

In addition, when forming a coating layer t14 with low emissivity on the outward facing surface of the copper pipe (2), an uncoiler circle and a mesh coating device t1 are used.
51, it is only necessary to provide the above-mentioned low emissivity paint application means (for example, spray, brush coating)'Ir, and when applying to other parts, the application means can be similarly placed at a predetermined position. 11-
Just set it up.

In the case of the 2.6th embodiment, the above-mentioned net-like body coating device, tape-like body coating device, foam layer coating device, etc. may be used in a predetermined number of stages.

Next, specific examples and comparative examples will be listed and explained.

■ Dimensions and structure of coated steel pipe il+ Conventional example copper pipe justice: Inner diameter 96sxo, st Coated copper pipe dimensions: Outer diameter chain 15 Structure: As shown in Figure 1 0 Low foam polyethylene C as the first resin coating layer (3) 0 Stabilized polyethylene as second resin coating layer (4) (thickness 0.5 rim) (2) Example 1 Copper pipe dimensions: Inner diameter 8 x O, 5t I6.15 Coating Steel pipe dimensions: Outer diameter 15cm Structure: Wrap the mesh A' around the copper tube, wrap it around the crepe paper, wrap it again with the mesh Ai, wrap the entire crepe paper around the copper pipe, and then wrap the mesh A' as the skin layer. Fully coated with .5 tack thick stabilized polyethylene. However, the separate body A is made of polyethylene, dimensions, and shape have a rectangular mesh pattern as shown in Figure 8, 11-1 old, a=b=2.5 bait, d=c=3m, t
- [17m, tape radius 20 bait, wrapping pitch 2ON (no overlap) were used.

(3) Example 2 Copper pipe dimensions: Inner diameter 8 x 0.5 coated Steel pipe dimensions: Outer diameter 9313 Structure: After wrapping the VC reticulated body 6 times on the copper pipe and applying craft mt + winding on top of it. The soil was coated with stabilized polyethylene of 0.5 d#I thickness as a skin layer.

1 layer open% 16υ-155094 (5) However, ■The net-like body B is made of polyethylene, and its dimensions and shape... have a rectangular mesh pattern as shown in Fig. 8, h=0.5 1a= b= 2my+11d
= c = 2.6 ttrm, t = 0.3 angle 20
Use a cap with a winding pitch of 20 mm (no overlap).

■We used kraft paper with a thickness of 0.4mm, a tape width of 20mm, and a @ pitch of 17 (6 fins for overlap).

■Performance Data Hot water was poured into each of the cladding tubes of Comparative Example and Example 1.2 listed in ■, and the amount of heat released was investigated. The results are shown in Table 1.

From Table 1, in Example 1, the heat loss is improved by 46% compared to the conventional example with the same outer diameter of the cover, and in Example 2, the heat loss is improved even though the outer diameter of the cover is 2 am smaller. Loss is 60%
I can see it's going up.

Next Leaf, 17 1st Table 18 As explained above, the coated copper pipe of the present invention, as the first invention, can be coated with a copper pipe or a copper alloy pipe directly or through a resin coating layer. The body has the entire covering layer, a tape-like body is formed on the covering layer, at least one wire-shaped heat insulating layer is provided, and at least one resin covering layer is provided on the net-like heat insulating layer. is formed, so a large number of independent air chambers are formed in the reticulated heat insulating layer, separated by the mesh of the reticulated material, and the air in the air chambers effectively provides insulation and heat retention. and its strength is not impaired. 'Ifc, as a second invention, in the coated copper pipe according to the first invention, on the same outer surface of the copper pipe and/or on the outward facing surface of at least one layer of the resin coating layer or the reticulated heat insulating layer, Since a coated layer of paint with a low emissivity is formed, heat loss due to radiation can be prevented, and the sound effect is superior to insulation and heat retention, and its industrial value is high. It is significant.

[Brief explanation of the drawing]

I! Figure g1 is a cross-sectional view showing the structure of a conventional coated copper thread tube.
9 and 2 are partial cross-sectional perspective views of the first embodiment of the present invention, FIG. 6 is a cross-sectional view of the first embodiment of the present invention, and FIG. 4 is a cross-sectional view of the second embodiment of the present invention. Figure 5 is a cross-sectional view of the sixth embodiment of the present invention, Figure 6 is a schematic diagram of the apparatus for producing coated copper pipes of the present invention, and the seventh factor is a foam layer coating apparatus. FIG. 8 is a perspective view showing the net-like body, and FIG. 9 is an explanatory view showing the state in which the tape-like body is wound around the covering layer of the net-like body. 12i...Copper pipe, 15)...Network, 16)...
・Tape-shaped body, (7)... Net-like heat insulating layer, (8)...
First resin coating layer, (91... second resin coating layer, [01
...Air chamber, (141...Uncoiler-1051.
... Net-like body coating device, ll1i1... Cheve-like body coating device, 0 force... Foam layer coating device, (181... Skin layer coating device, 09)... Extruder, (20)...・Cross head. Special Bt applicant: Kobe Steel, Ltd. Japanese Patent Application Sho GO-155094 (7)

Claims (1)

[Scope of Claims] 1. A copper tube or copper alloy tube having a coating layer of a net-like body directly or through a resin lamination layer outwardly, and a tube-shaped body being wound on the coating layer. 1. A coated copper thread tube comprising at least one reticular heat insulating layer and at least one resin coating layer formed on the reticular heat insulating layer. 2 At least one layer of a reticular heat insulating layer having a reticular covering layer directly or via a resin covering layer outwardly of the copper pipe or copper alloy pipe and having a tube-like member wound around the covering layer. is provided, and a coating layer of a paint with a low emissivity is formed on at least one resin layer on the reticulated heat insulating layer or on the outward facing surface of at least one layer of the reticulated heat insulating layer. coated copper pipe.