JPH09259671A - Frp tube for polymer insulating tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a n FRP tube for polymer insulating tube which can improve a yield rate of a product by preventing generation of a flaw in an internal peripheral surface of the FRP tube, by providing a buffer layer in a part changing at least a sectional shape, and absorbing changing of a glass robing by the buffer layer. SOLUTION: An FRP tube 1 for a polymer insulating tube formed by a filament winding method winding a glass robing onto a mandrel is constituted by linear shaped parts 2, 3 of linear shaped section and a tapered part 4 with a section between the linear shaped parts 2, 3 in a tapered shape. In an internal peripheral surface of a part of a part changing the FRP tube 1 from the linear shaped part 2 to the tapered part 4 and a part changing from the tapered part 4 to the linear shaped part 3, respectively, buffer layers 5, 6 are provided, changing of the glass robing is absorbed by the buffer layers 5, 6. In this way, generation of a flaw in the internal peripheral surface of the FRP tube 1 is prevented, a yield rate of a product can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an FRP cylinder for a polymer porcelain tube produced by a filament winding method in which glass roving is wound around a mandrel.

[0002]

2. Description of the Related Art As a polymer porcelain tube constituting electric power equipment such as a gas circuit breaker, an FRP tube, an outer cover portion provided on the outer peripheral surface of the FRP tube, and a flange metal fitting provided on at least one end of the FRP tube. A polymer porcelain tube consisting of is used. FIG. 3 is a diagram showing the configuration of an example of such a polymer porcelain tube. In the example shown in FIG. 3, the polymer insulator tube 51
Is composed of an FRP cylinder 52 and an outer cover portion 53 made of rubber. The outer jacket portion 53 is composed of an outer jacket barrel 54 provided on the entire outer peripheral surface of the FRP cylinder 52, and a cap portion 55 protruding from the outer jacket barrel 54. And FR
Flange metal fittings 56 are provided at both ends of the P cylinder 52.

F used in the above-mentioned polymer porcelain tube 51
The RP cylinder 52 comprehensively evaluates cost, productivity, and electrical / mechanical performance, and as shown in FIG.
A glass roving 58 impregnated with a resin in which an epoxy resin and an amine or an acid anhydride-based curing agent are mixed with a fluorine- or silicone-based release agent (not shown) is used while suppressing generation of voids in a clean room. It is made by a filament winding method in which a plurality of filaments are wound at the same time.

[0004]

At this time, in the conventional filament winding method, the taper shape F
When obtaining the RP cylinder 52, that is, when obtaining the FRP cylinder 52 including the portions 61 and 63 having a linear sectional shape and the tapered portion 62 as shown in FIG. 5, the sectional shape is a straight line. A portions and B that are portions that change from the shaped portions 61 and 63 to the tapered portion 62
There is a problem that when the glass roving is wound around the mandrel 57 or when it is cured, a slight displacement occurs between the rovings near the mandrel surface.

That is, the FRP cylinder 52 of the A part and the B part
Relative displacement occurs between the mandrel 57 and the roving in the vicinity of the inner surface of the FRP tube 52, and as a result, the inner surface of the A and B parts of the FRP cylinder 52, which has been cured, has a depth of 0.5 in the radial direction and the axial direction.
There is a problem that scratches of about mm are generated. This flaw has a possibility of lowering the internal pressure strength, and in that case, it causes a reduction in the yield in the production, so it was not acceptable.

An object of the present invention is to solve the above-mentioned problems,
It is an object of the present invention to provide an FRP cylinder for a polymer porcelain tube which can prevent the occurrence of scratches on the inner peripheral surface of the FRP cylinder, and as a result can improve the yield of products.

[0007]

A polymer porcelain tube FRP cylinder of the present invention is a polymer porcelain tube FRP cylinder produced by a filament winding method in which glass roving is wound on a mandrel. FR of the part that changes to shape
A buffer layer is provided on the inner peripheral surface of the P cylinder.

According to the present invention, when the FRP cylinder is manufactured by the filament winding method, a buffer layer wound at a lower tensile force than that of glass roving is provided at least in a portion where the cross-sectional shape is changed, and a buffer layer that is more closely attached to the mandrel is provided. It is incorporated in the buffer layer, which prevents the relative displacement of the glass roving, and also prevents the scratches on the inner peripheral surface of the FRP cylinder due to the deformation of this layer even during curing, resulting in a higher product yield. Can be improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an F for a polymer porcelain tube of the present invention.
It is sectional drawing which shows the structure of an example of RP cylinder. In the example shown in FIG. 1, the FRP cylinder 1 is composed of linear portions 2 and 3 having a linear cross section, and a tapered portion 4 having a tapered cross section between the linear portions 2 and 3. What is important in this embodiment is that the buffer layer 5 and the inner peripheral surface of the portion changing from the linear shape portion 2 to the tapered shape portion 4 and the portion changing from the taper shape portion 4 to the linear shape portion 3 are respectively formed. This is the point where 6 is provided.

The buffer layers 5 and 6 may be made of any material as long as they can finally be integrated with the glass roving to form the FRP cylinder 1, but the same material as the glass roving can be used for the tape-shaped substrate. It is preferable to use the resin impregnated with the resin of (1), which is wound in the longitudinal direction by a predetermined thickness and cured, because the FRP cylinder 1 more integrated with the glass roving can be obtained. As the tape-shaped substrate, it is preferable to use a polyester nonwoven substrate. The materials of the buffer layers 5 and 6 described above are well integrated with the epoxy resin forming the main body of the FRP cylinder and integrated.

Further, the F having a normal thickness of several mm to ten and several mm is used.
When obtaining the RP cylinder 1, the thickness of the buffer layers 5 and 6 is set to 0.
It is preferably 5 to 1.5 mm. In the example shown in FIG. 1, the buffer layer 5 is formed on each of the inner peripheral surface of the portion changing from the linear portion 2 to the tapered portion 4 and the inner peripheral surface of the portion changing from the tapered portion 4 to the linear portion 3. Although 6 and 6 are provided, it goes without saying that the effect of the present invention can be obtained even if the buffer layer is provided on only one of them. Further, in the example shown in FIG. 1, the buffer layers 5 and 6 are provided over the entire circumference of the inner peripheral surface of the FRP cylinder 1. However, they need not be provided over the entire circumference, that is, may be partially provided on the inner peripheral surface. Needless to say, the effects of the present invention can be obtained.

FIG. 2 is a view for explaining an example of producing the FRP cylinder for polymer porcelain tube of the present invention by the filament winding method. First, as shown in FIG. 2A, tape-shaped substrates 11 and 12 in which a polyester non-woven fabric is impregnated with an epoxy resin are preferably formed on a portion of the mandrel 7 where the shape of the buffer layers 5 and 6 is to be changed. To place. After that, as shown in FIG. 2B, the tape-shaped substrate 1
The FRP cylinder 1 can be formed by the filament winding method in which the glass roving is wound on the mandrel 7 on which 1 and 12 are arranged under the same conditions as usual.

The usual filament winding method is
The glass roving 8 impregnated on the mandrel 7 with a resin containing an epoxy resin and an amine or acid anhydride curing agent via a fluorine- or silicone-based release agent (not shown) suppresses the generation of voids in a clean room. While doing this, it is done by winding multiple windings at the same time. At this time, a plurality of glass rovings 8 are alternately laminated in a mandrel 7 shape at an angle θ with respect to the central axis O of the FRP cylinder 1 in the range of about 20 ° to 60 °. The angle θ is set to an optimum value that can withstand the internal pressure and bending load that are obtained in advance.

The present invention is not limited to the above-described embodiment, but can be variously modified and changed. For example,
In the embodiment described above, the buffer layer is provided only in the portion where the cross-sectional shape of the FRP cylinder 1 changes from the linear shape to the tapered shape, because this portion is the portion where the glass roving is most likely to move, It goes without saying that the effect of the present invention can be obtained even if a buffer layer is provided in other portions.

[0015]

As is apparent from the above description, according to the present invention, the FRP by the filament winding method is used.
At the time of manufacturing the cylinder, the buffer layer is provided at least at the portion where the cross-sectional shape changes, and the change in the glass roving is absorbed by the buffer layer, so that it is possible to prevent scratches on the inner peripheral surface of the FRP cylinder, and as a result, the product The yield can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an example of an FRP cylinder for polymer porcelain tubes according to the present invention.

FIG. 2 is a view for explaining an example of producing the FRP cylinder for polymer porcelain tube of the present invention by a filament winding method.

FIG. 3 is a view showing an example of a polymer porcelain tube.

FIG. 4 is a diagram showing a state of a filament winding method.

FIG. 5 is a diagram showing a configuration of an example of a conventional FRP cylinder for polymer porcelain tube.

[Explanation of symbols]

1 FRP cylinder, 2 and 3 linear shape part, 4 taper shape part, 5 and 6 buffer layer, 7 mandrel, 8 glass roving

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B29K 309: 08 B29L 23:00

Claims (4)

[Claims] 1. An FRP cylinder for a polymer porcelain tube produced by a filament winding method in which glass roving is wound on a mandrel, and at least a portion of the FRP cylinder whose cross-sectional shape changes from a linear shape to a tapered shape.
An FRP cylinder for a polymer porcelain tube, wherein a buffer layer is provided on the inner peripheral surface of the P cylinder. 2. The buffer layer is obtained by impregnating a tape-shaped base material with a resin of the same system as that of glass roving, winding the same in a longitudinal direction and hardening it.
The FRP cylinder for the polymer porcelain tube described. 3. The F for polymer insulator pipe according to claim 2, wherein the tape-shaped base material forming the buffer layer is made of polyester nonwoven fabric.
RP tube. 4. The FRP cylinder for a polymer porcelain tube according to claim 1, wherein the buffer layer has a thickness of 0.5 to 1.5 mm.