JPH0452552Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The invention is applicable to chemical products such as semiconductors and pharmaceuticals,
This invention relates to fluororesin fluid transport pipes used in food manufacturing factories.

[Conventional technology]

Conventional transport pipes of this type are generally made of a fluororesin material only, and those whose outer circumferential surface is covered and reinforced with a fibrous structure are known.

[The problem that the idea attempts to solve]

However, all of these are electrically insulative as a whole, and static electricity is likely to be generated on the inner circumferential surface when the fluid to be transported passes through them.

When static electricity is generated on the inner periphery of the transport pipe in this way, static electricity is charged on the outer periphery of the transport pipe, causing various problems. For example, in an atmosphere where flammable solvents, etc. are present,
There is a risk of ignition or the like, or there is a risk of fine dust being adsorbed and deposited on the outer peripheral surface of the transport pipe.

In view of these points, the present invention aims to provide a fluororesin fluid transport pipe that does not have any effect on the outer circumferential side even if static electricity is generated on the inner circumferential side. .

[Means to solve the problem]

In order to achieve the above object, the present invention, in particular, embeds a conductive material layer made of conductive nylon fibers braided into a cylindrical shape in the pipe wall of a fluororesin fluid transport pipe. We propose a three-layer structure in which an inner peripheral fluororesin layer and an outer peripheral fluororesin layer of the same quality are connected at the interfiber portion of the conductive material layer.

[Effect]

When static electricity is generated on the inner peripheral side of the transport pipe due to the passage of the fluid to be transported, the static electricity is grounded by the conductive material layer and eliminated. Therefore,
Even if static electricity is generated on the inner periphery of the transport pipe, the static electricity will not have an adverse effect on the outer periphery of the transport pipe.

In addition, the conductive material layer is a stretchable nylon fiber braided structure, which is strong against bending and twisting, unlike cases where metal fiber braided structures or metal wires are buried, and is subject to repeated bending and twisting. Also, it will not cut or interfere with the flexibility of the tube.
Furthermore, the same fluororesin layers on both sides of the conductive material layer are interconnected, making the three layers that make up the tube wall inseparable, so they can withstand bending or twisting. However, no slipping occurs between the layers, and the degree of adhesion between the conductive material layer and the fluororesin layer does not decrease. Therefore, it has excellent pressure resistance and durability, and can exhibit a good grounding function even when subjected to bending or twisting.

〔Example〕

Hereinafter, the configuration of the present invention will be specifically explained based on the embodiment shown in FIGS. 1 and 2.

In the fluororesin fluid transport tube 1 according to the present invention, as shown in FIGS. 1 and 2, the tube wall has a conductive material layer 3 formed by braiding conductive inner fibers 3a into a cylindrical shape. By embedding the conductive material layer 3, a three-layer structure is formed in which the inner peripheral fluororesin layer 2 and the outer peripheral fluororesin layer 4 of the same quality are connected 5 at the interfiber portions of the conductive material layer 3.

The constituent material of the transport pipe 1, that is, the constituent material of the fluororesin layers 2 and 4, is generally a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer (PFA).
In addition, ethylene tetrafluoride/propylene hexafluoride copolymer (FEP), polytetrafluoroethylene (PTFE), ethylene/tetrafluoroethylene copolymer (ETFE), ethylene/trifluoride trichloride are used. Fluorinated ethylene copolymer (ECTFE) or the like may also be used.

As the braid constituent material of the conductive material layer 3, carbon,
A known conductive nylon fiber 3a containing nickel, copper, etc. is used.

In the transport pipe 1 configured as above,
Even when static electricity is generated on the inner circumferential side, the static electricity is grounded by the conductive material layer 3, and its adverse effect does not reach the outer circumferential side.

Such a grounding effect is extremely effective because the conductive material layer 3 is a high-density braided structure interposed in close contact between the fluororesin layers 2 and 4 which are connected to each other. Moreover, since the conductive material layer 3 is covered with the outer periphery fluororesin layer 4, dust generation in the braided structure 3 can be prevented.

Although the pipe wall of the transport pipe 1 has a three-layer structure with a conductive material layer 3 of different nature interposed between the fluororesin layers 2 and 4, both fluororesin layers 2 and 3 are of the same quality. Because of this, the layers 2, 3, and 4 are firmly connected, even when subjected to repeated bending and twisting.
There is no slippage between the pipes, the thickness of the pipe wall is maintained constant, and it has excellent pressure resistance and durability. Moreover, since the conductive material layer 3 is a braided structure of stretchable nylon fibers 3a, it is strong against bending and twisting and will not be cut, so it has a high degree of adhesion with the fluororesin layer. In combination, a good grounding function can always be exhibited.

[Effect of idea]

As can be easily understood from the above explanation, according to the present invention, the static electricity generated on the inner circumferential side due to the passage of the fluid to be transported is eliminated by the grounding effect of the conductive material layer, and the charging on the outer circumferential side is eliminated. This can be reliably prevented. Therefore, the disadvantages caused by static electricity as mentioned at the beginning do not occur.

In addition, since the inner fluororesin layer and outer fluororesin layer of the same quality are integrally connected at the gap between the conductive material layers, there is no slippage between the layers even when bent or twisted, and the three layers are tightly integrated. is maintained in the same state. Therefore, since the conductive material layer is a nylon fiber braided structure with excellent flexibility, the presence of the conductive material layer does not reduce the pressure resistance or durability of the pipe in any way. There is no.

Further, the conductive material layer is maintained in close contact with the inner circumferential fluororesin layer regardless of bending or twisting. Moreover,
Since the conductive material layer is a braided structure of stretchable conductive nylon fibers, it is resistant to bending and twisting and will not be cut. Therefore, even when subjected to repeated bending and twisting, a good grounding function can be exhibited.

Furthermore, since the outer surface is made of a durable fluororesin, there is no risk of the outer surface deteriorating or cracking during long-term use, and it also has a good appearance and high commercial value. Furthermore, since the conductive material layer, which is a braided structure, is not exposed, there is no generation of dust from the fibers.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a fluororesin fluid transport pipe according to the present invention, and FIG. 2 is a longitudinal sectional side view of the main part thereof. DESCRIPTION OF SYMBOLS 1... Fluororesin fluid transport pipe, 2... Inner fluororesin layer, 3... Conductive material layer, 4... Outer fluororesin layer, 5... Connection portion between both fluororesin layers.

Claims (1)

[Scope of utility model registration request] By embedding a conductive material layer made of cylindrical braided conductive nylon fibers in the tube wall, the inner fluororesin layer and outer fluororesin layer of the same quality form the interfiber portions of the conductive material layer. A fluororesin fluid transport pipe characterized in that it has a three-layer structure connected to each other.