JPS63318385A - Flexible tubular body and production unit thereof - 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] [Industrial Application Field] The present invention relates to a flexible tubular body suitable for, for example, a gas pipe, provided with a sealing layer made of a self-sealing material, and a flexible tubular body suitable for forming the sealing layer. This relates to manufacturing equipment.

[Conventional technology]

Taking as an example a gas pipe used for indoor piping from the main tap of city gas or propane gas to the gas cock, this type of gas pipe is generally made of steel pipes or stainless steel flexible pipes, mainly from the viewpoint of durability. is used.

[Problem that the invention seeks to solve]

However, in the case of gas pipes made of steel pipes, both ends of the straight pipe section of the steel pipe are threaded at the construction site, and at the corner or R section, a separately prepared bent pipe is screwed into the threaded part to connect it as desired. He was doing plumbing work. Therefore, gas pipes using this steel pipe have a problem in that construction costs including material costs and labor costs are high.

Therefore, as an alternative to this steel pipe, a flexible pipe made of stainless steel is sometimes used. According to this method, there is an advantage that the thread cutting and connection processes at corners and curved parts are unnecessary, and the construction cost is reduced, but since the material is stainless steel, the material cost is still high. Furthermore, since the pipe is flexible and has a corrugated shape, there is a problem in that the pressure loss is large and the transport capacity is lacking. In addition, when fixing both types of gas pipes to a wall or pillar, it is necessary to use special fittings, and there is a problem in that it is difficult to attach them depending on the location. Note that this problem is not limited to gas pipes, but also applies to liquid supply pipes such as water pipes.

This invention was made in view of the above-mentioned technical background, and its first purpose is to provide a device with adequate flexibility and almost no gas or liquid leakage even when nailed into it. It is an object of the present invention to provide a flexible tubular body which is equipped with the following features and can reduce the cost of materials and construction.

A second object of the present invention is to provide an apparatus for manufacturing a flexible tubular body that can uniformly cover the tubular body with a sealing layer of a desired thickness made of a self-sealing material. be.

[Means for solving problems]

In order to achieve the above-mentioned first object, the present invention provides a flexible tubular body having a multilayer structure, and at least one layer thereof is a sealing layer made of a self-sealing material.

In addition, in order to achieve the second object, the apparatus of the present invention includes a heating tank that heats the raw material to be coated, that is, a viscoelastic material in a stored state, and a tubular body formed on the side wall of the heating tank to be coated. A slide spacer and an outer diameter die are sequentially inserted through the slide spacer and an outer diameter die, and a cooling device is provided for cooling the tubular body that is guided out from the outer diameter die in a state covered with the viscoelastic material.

[For production]

According to this flexible tubular body, since each layer is flexible, piping can be easily done, and even if a nail is driven, gas or liquid will not leak due to the self-sealing property of the sealing layer. Since there is no problem, you can simply nail it to the wall or pillar.

This allows the piping to be easily bent to any position using only nails.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

First, the structure of a gas pipe according to a first embodiment of this flexible tubular body will be explained with reference to FIG. This gas pipe 11 includes an inner pipe 12, an outer pipe 13, and a sealing layer 14 made of a self-sealing material provided between them.

The inner tube 12 has, for example, an inner diameter of 9.5 Iφ and an outer diameter of 14.5 nn.
The seal layer 14 formed on the outer circumferential side of the single rubber pipe for city gas of φ is made of, for example, a polybdenum sealant 14a. In this example, the sealant 14a is a spring with a linear diameter of 1.2 m, an inner diameter of 14 mφ, and a pitch of 5 m. A spiral wire 15 made of spirally wound steel is filled between the same portions of the spiral wire.

According to this embodiment, on the outer peripheral side of the seal layer 14.

For example, a plastic tape 16 with a thickness of 0.14 AO is wound, and a braided wire 17 with a diameter of 0.22 nm×24 strokes and a pitch of 951 m is further wound around the outer circumference of the tape 16. Then, vinyl chloride TPE (
The outer tube 13 is coated with a thermoplastic elastomer.
The gas pipe has an outer diameter of 22.5 mmφ.

The plastic tape 16 is TPE as the outer tube 13.
This is to prevent the head and die of the extruder from coming into contact with the sealant 14a when coating the extruder. Further, since the braided wire 17 is pulled by a pulling machine when the outer tube 13 is covered with TPE, this is to prevent the spiral wire 15 from elongating and being unable to uniformly cover the TPE.

The test results for the gas pipe 11 having such a configuration are shown below.

(A) Nailing resistance First, the above gas pipe 11 with a length of 1m is
,0 (110+nm Hg) and 2.7+
When a nail measuring m+φ×50 m was driven through the hole and left for two weeks, the internal pressure was measured, and almost no pressure drop was observed.

Next, we measured the internal pressure immediately after the nail was removed, and found that
The results shown in the following table were obtained.

(B) Flatness resistance The above gas pipe 11 with an outer diameter of 22.5 nnφ has a length of 100 mm.
A load of 50 kg is applied for 3 minutes across ++a, and the pipe diameter after 1 hour has passed after the load is removed is 21.2 m.
It was e+φ.

(C) Other characteristics ■Flexibility It has moderate softness and can be wound into coils.

■Minimum bending radius Less than twice the diameter.

■Bending moment I was able to bend it at right angles with my bare hands with the minimum bending radius.

■Repeated bending No abnormality is observed even if the minimum bending radius is repeated 8 times or more.

■President It is possible to produce products with long lengths of 50 m or more.

■Airtightness It can withstand a pressure of 1.5 kgf/ad.

■Gas permeability Pass the gas permeation test for gas rubber pipes.

Based on the above test results, the gas pipe of this example was evaluated as follows. In other words, there is almost no drop in internal pressure when a nail is driven. Therefore, even if the piping is nailed, there is almost no risk of gas leaking from the nailed part.
Regarding the decrease in internal pressure after nail removal, in this test the nails were removed all at once, but the rate of decrease in internal pressure varies depending on how the nail is removed. Regarding this point, in the gas pipes currently available on the market, the internal pressure immediately drops to O when the nail is removed.

In terms of flatness resistance in this test, although the pipe diameter was not completely restored, it is thought that restoration is possible by selecting the rust resistance, wire diameter, and pitch of the spiral wire 15.

In addition, in the gas pipe 11 according to the above embodiment, the inner pipe 1
Rubber pipes for city gas are used as 2, but other metals such as Fe, Al, Cu, alloys of these, and PE are also used.
, PVC, fluororesin, nylon, and other thermoplastic resins (
There are rubber agents such as elastomer), cloprene rubber, EPDM, and fluororubber.

The material for the sealant 14a may be any material as long as it has self-sealing properties, but examples include polybdenum-based, acrylic-based, silicone-based, and urethane-based sealants, such as bonded silicone caulk, bonded modified silicone caulk, bonded modified urethane caulk, and bonded acrylic. Coke, bond oil-based coke, Passbond (manufactured by Konishi Co., Ltd.), Boss Seal Mini (manufactured by Cemedine Co., Ltd.), Three Bond No. 4 (manufactured by Three Bond Co., Ltd.), silicone grease 5H7071 (manufactured by Toshi Co., Ltd.), and the like are commercially available. Further, as the material for the outer tube 13, the same material as that for the inner tube can be used.

Next, a second embodiment is shown in FIG. In this embodiment, gas is generated from an inner tube 12, a sealing layer 14 made of a sealant 14a having self-sealing properties filled between the windings of a spiral wire 15, and an outer tube 13 covering this sealing layer 14. This shows that by selecting the material of the sealant 14a, it is possible to eliminate the need for the plastic tape 16 and braided wire 17 as in the first embodiment.

In this embodiment, even if the inner tube 12 and the spiral wire 15 are integrally made of plastic, the same effect can be achieved.

Furthermore, in the third embodiment shown in FIG.
An inner layer corresponding to the inner tube 12 is formed by a spiral spring 20 whose pitch corresponds to the wire diameter, and a sealing layer 14 made of a self-sealing sealant 14a is provided on the outer periphery of the spiral spring 20.
Furthermore, it is covered with an outer tube 13 similar to the first embodiment. In this example, the spiral spring 20 is intended to elastically return to its original position once the nail is removed, thereby closing the hole more effectively.

Further, in the case of the third embodiment, similar effects can be obtained by using the spiral spring 20 as a plastic helical tube.

In a fourth embodiment shown in FIG.

A self-sealing sealant 14a is coated on the outer periphery of an inner tube 12 similar to the first embodiment to form a sealing layer 14, resulting in a two-layer structure, and the sealing layer 14 also functions as an outer tube. It has a simple structure. However, in this case sealant 1
For the material 4a, it is necessary to select a material that at least hardens the surface after being coated to form a surface structure similar to that of a normal gas pipe.

In the fifth embodiment shown in FIG. 5, a sealant 14a is provided between the inner tube 12 and the outer tube 13 of the first embodiment.
It can also be said that the outer tube 13 is coated on the outer periphery of the seal layer 14 of the fourth embodiment. In this case, unlike the fourth embodiment, the seal layer 14 is isolated from the outside air, so there is no need to particularly consider the hardness after coating.

In the sixth embodiment shown in FIG. 6, a seal N! is provided between the inner tube 12 and the outer tube 13 similar to the first embodiment.
As J14, an adhesive layer 21 is formed, and for example, an adhesive curing agent layer 21a is formed on the inner tube 12 side.

A diaphragm 21b separating the curing agent layer 21a is coated on the outer periphery of the diaphragm 21b, and a main adhesive layer 2
1c, and since the diaphragm 21b is broken at the point where the nail is removed after nailing, the main adhesive 21c and the curing agent 21a react and harden, and the inner tube 1
2 and the perforated portion of the outer tube 13 are sealed. Thereby, there is no risk of gas leaking even if the nail is removed.

Next, the manufacturing apparatus for this flexible tubular body will be explained with reference to FIG.

This device 30 includes a heating tank 31 and a lower part 36 of the heating tank 31.
A slide spacer 32 and an outer diameter die 33 provided on the side wall 31a of the outer diameter die 33, and a cooling device 34 provided near the outlet of the outer diameter die 33 are provided.

The heating tank 31 is formed into a hopper shape with a hollow lower part 36, and is double coated with a heater part 37 in which an electric heater is embedded in the outer circumferential part and a heat insulating part 38. This heater section 37 is a known thermocouple temperature control means 37a.
This allows the temperature to be freely adjusted within the range of, for example, 30 to 200°C. In addition, this heating tank 3
A pressure plate 41 that is pressurized by a pressure cylinder 40 is disposed in the opening 39 at the upper end of 1, and a viscoelastic material, which will be described later, stored in the heating tank 31 is set by the pressure cylinder 40. It is pressurized.

The viscoelastic material used here is, for example, Vistanex L
MMS (blending ratio 80), Evatac 5V7100 (same 5
0), Bolybdenum HV 1900 (50) at 200℃
The heated and dissolved solution was placed in a kneader (not shown) and stirred for 2 minutes, and then the oysters were removed and stirred for 1 minute, stopped for 7 minutes, then stirred for 1 minute, stopped for 9 minutes, three times or more for a total of 40 minutes.
The color paste (mixing ratio: 2) and Erosil (mixing ratio: 14.5) were added and stirred.
This viscoelastic material is put into the heating tank 31.

The slide spacer 32 and the outer diameter die 33 provided at the lower part 36 of the heating tank 31 are for inserting the rubber tube 42, which is an inner tube, into the heating tank 31 from the outside. It is inserted into the spacer 32 and slid at this location in synchronization with the outer diameter of the rubber tube 42, thereby preventing the rubber tube 42 from being abnormally deformed when flowing in the direction of the outer diameter die 33. Moreover, this slide spacer 32 is intended to prevent the viscoelastic material from flowing out from the heating tank 31, and its inner diameter is a sun circle shape, and the outer diameter tolerance of the rubber tube 42 is specified to be -1 to -0.5 m. do.

The outer diameter die 33 defines the coating thickness of the viscoelastic material layer attached to the outer periphery of the rubber tube 42 when the rubber tube 42 passes through the viscoelastic material, and is replaced each time according to the set thickness. A centering pin (not shown) is attached to correct the problem of wall thickness change.

The cooling device 34 has a refrigerant evaporator 43 installed in a circulation path 44 and circulates air through the evaporator 43 using a fan 45.
2 is used to obtain a circulating flow B with an ambient temperature of about -20°C, and the rubber tube 42 coming out of the heating tank 31 from the outer diameter die 33 is inserted in a direction almost perpendicular to the air flow in the circulating path 44. be done. As a result, the adhesive material evenly adhered to the outer circumference of the rubber tube 42 is cooled at the above temperature, and the sealing layer 4
6 is coated on the outer periphery of the rubber tube 42. After passing through this cooling device 34.

It is inserted into an outer protective layer coating extruder (not shown) to form the outermost protective layer.

When covering the rubber tube 42 using the device 30 configured as described above, first set the slide spacer 32 and the outer diameter die 33 according to the outer diameter of the rubber tube 42, and 42 is inserted into the heating tank 31.

Then, the above-mentioned viscoelastic material is put in and the temperature is set, and when the temperature rises to 80 to 100 degrees Celsius, the rubber tube 42 is caused to flow at a constant speed in the direction of arrow A. As a result, a preset thickness, e.g. The viscoelastic material is coated to a thickness of -10 to -20 mm in the cooling device 34 in the next step.
Rapidly cool at ℃ to prevent collapse of outer diameter and change in thickness. This cooling hardens the soft material, making it easier to carry out the enveloping process in the next process and maintaining production stability.

According to the embodiment described above, the outer periphery of the rubber tube 42 is coated with a viscoelastic material layer, and the sealing layer 4 made of a self-sealing material is made of a self-sealing material.
6 can be easily and uniformly formed, and a nailable piping member with less risk of gas leakage or liquid leakage can be manufactured.

Although the above embodiments are mainly explained using gas pipes as an example, it goes without saying that the tubular body according to the present invention can also be applied to liquid supply pipes such as water pipes.

〔Effect of the invention〕

As explained above, the flexible tubular body of the present invention has the following features: (1) It is bendable and there is no risk of gas leaking even when nailed, so it can be fixed at any location by, for example, nailing; (2) In some cases, plumbing work can be done with just nails.
No piping accessories are required, making the work extremely simple and reducing construction costs. ■ Also, in this type of gas pipe, synthetic resin can be used for the outer pipe 13, so it can be painted in any color. It can be colored, so there is little risk of deteriorating the aesthetics even if it is exposed indoors during piping. Furthermore, since metals such as steel or stainless steel are not used as is, they are not only light and easy to handle, but also use materials. Costs can also be kept low.

(1) Since the surface of the inner tube 12 is smooth, there are various effects such as no pressure loss.

Further, according to the manufacturing apparatus of the present invention, the tubular material can be coated with the viscoelastic material of a desired thickness simply by passing the tubular body through the heated and melted viscoelastic material.

[Brief explanation of the drawing]

1 to 6 are for explaining an embodiment in which the present invention is applied to a gas pipe. FIG. 1 is an explanatory diagram showing the cross-sectional structure of the first embodiment, and FIG. FIG. 3 is an explanatory diagram showing the cross-sectional structure of the third embodiment. FIG. 4 is an explanatory diagram showing the cross-sectional structure of the fourth embodiment. FIG. 6 is an explanatory diagram showing the cross-sectional structure of the sixth embodiment; FIG. 7 is a schematic cross-sectional diagram showing an example of the manufacturing apparatus according to the present invention. . In the figure, 11 is a gas pipe, 12 is an inner pipe, 13 is an outer pipe, 14 is a seal layer, 14a is a sealant, 30 is a manufacturing device, 31
32 is a heating tank, 32 is a slide spacer, 33 is an outer die, 34 is a cooling device, 37 is a heater section, 40 is a pressure cylinder, 41 is a pressure plate, 42 is a rubber tube, and 46 is a sealing layer. Patent Applicant Sumitomo Rubber Industries Co., Ltd. Agent Patent Attorney Taku Ohara Figure 1 Figure 2 Figure 5 Figure 7 Procedural Amendment () November 17, 1988 Kunio Ogawa, Commissioner of the Japan Patent Office 2 Name of the invention Flexible tubular body and apparatus for manufacturing the same 3 Relationship with the person making the amendment Patent applicant Tsutsui-cho, Chuo-ku, Kobe City, Hyogo Prefecture 1-1-1 Sumitomo Rubber Industries Co., Ltd. Representative Katsura 1) Shizuo 4, Agent (102) 6. Column 7 of "Detailed Description of the Invention" in the specification to be amended, Contents of the amendment ( 1) In the specification, page 15, line 9, add the legal text after "...to be inserted." r again. As this viscoelastic material, Evatac 5V71
00 (manufactured by Nippon Petrochemical Corporation) and Erosil #200 (manufactured by Nippon Aerosil Corporation) (10:1 by weight),
Bolibdenum HV 1900 (Nippon Petrochemical r, trun
) and Erosil #200 (weight ratio: 10:
0.8) etc. "that's all

Claims (12)

[Claims] (1) A flexible tubular body having a flexible multilayer structure, at least one of which is a sealing layer made of a self-sealing material. (2) The flexible tubular body according to claim 1, wherein the sealing layer is formed between the inner tube and the outer tube. (3) The flexible tubular body according to claim 2, wherein the sealing layer has a spiral structure. (4) The flexible tubular body according to claim 1, wherein the seal layer is supported by a helical spring. (5) The flexible tubular body according to claim 2, wherein the inner tube is made of a plastic spiral tube. (6) The flexible tubular body according to claim 1, wherein the outer skin of the tubular body is made of the sealing layer. (7) The flexible tubular body according to claim 1, wherein the sealing layer is made of a polybdenum sealant. (8) The flexible tubular body according to claim 1, wherein the sealing layer is composed of a main ingredient of an adhesive and a curing agent that are adjacent to each other with a diaphragm interposed therebetween. (9) A heating tank that heats the stored viscoelastic material to be coated, a slide spacer and an outer die that are provided on the side wall of the heating tank and through which the tubular body to be coated is inserted, and a 1. An apparatus for manufacturing a flexible tubular body, comprising: a cooling device for cooling a tubular body that is delivered in a state covered with a viscoelastic material. (10) The apparatus for manufacturing a flexible tubular body according to claim 9, wherein the slide spacer and the external die are coaxially disposed at lower portions of opposing side walls of the heating tank. (11) The apparatus for manufacturing a flexible tubular body according to claim 9, wherein the heating tank is equipped with a pressure plate that pressurizes the viscoelastic material stored therein. (12) The flexibility according to claim 9, wherein the cooling device has a cold air circulation path including a refrigerant evaporator, and the tubular body is inserted through the cold air circulation path. Tubular body manufacturing equipment.