DD210234A1 - TUBE OF FIBER-REINFORCED PLASTIC, ESPECIALLY INSULATING TUBE FOR HIGH-VOLTAGE DEVICES - Google Patents

Abstract

The invention relates to high-voltage devices, in particular high-voltage switches and transformers, but also in areas of mechanical engineering, in which the transmission of forces and torques by means of shafts and the like. The object and the object of the invention are to develop a cost-effective tube with textile reinforcement using aromatic polyamide and saturated polyester as fiber surface fabricated fiber material, at which the optimum of the ratio of tensile strength and ultimate strength is achieved Negative effects of UV radiation are negligible and that is mechanically machinable. In the pipe according to the invention, the result is that the reinforcement of the pipe consists of alternating layers of textile surface formations, eg Woven fabrics consisting of fibers of an aromatic polyamide with those made of fibers of a saturated polyester and that on the inner and the outer side of the tube this Verstaerkung is completed with at least one layer of the fabric fabric made of fibers of gesaettigten polyester.

Description

Field of application of 5z; Find:

The invention is particularly applicable to Eoch voltage seeders, especially high voltage switches and transformers. However, it is also suitable in the fields of mechanical engineering in which the transmission of forces by means of yells and the like is required.

Characteristic of the known technical solutions:

3s is known to manufacture Drill from a curable by polyaddition Gie £ hars _s z * B.'Epoxidharz, and a tissue au, which is embedded in multiple layers in aas casting resin. (Wende, Moebes, Harten) "Glass Fiber Reinforced Plastic", YSB Deutscher Verlag für Grundstoffindustrie Leipzig 1969? 3. 193-210), The fabric, which contains two transverse load rows (Eett- and weft threads), it has a stiffening function.

In electrical engineering, such drills are used in particular in the construction of high-voltage switches and transformers in which compressive or tensile forces are to be transmitted between conductive parts of different potential In particular, a high wall thickness ratio (ratio of wall thickness to major china) is desired, but reinforced glass fiber mesh can only be manufactured to a certain wall thickness ratio, above which value joints and gaps between the fabric layers during the curing of the resin which hinder both mechanical and electrical strength

30.StR 193? -0HS133

Wall thicknesses in relation to fugitive joints "For SFg gas-insulated high-voltage equipment, it is important to note that the use of conventional reinforcing materials such as glass-fiber fabric is not considered due to the fluorine-containing median (chemically extremely reactive decomposition products of the SjüV insulating gas) sow "thus 3s makes the application 70ll37ntb.atisc-h.ei! organic fiber .stoffe in the form of textile Fläehengebilda _t like tissue. mats, YI ie se, Siähgewirken required ^ dis sufficient chemical Dauerresistena against SF _r -Zer3at2ungsprodukte aufweisenj where the mechanical strengths of which ¹ glass fiber should be analogous or high

The use of a pure polyester fiber reinforcement fabricated as a fabric or Fadanwicksl ₃ is also known5 although kaine very large strengths can be achieved due to the high Dehn ^ receive, 'From DE-AS 2264341 (H OI B, 3/00) is an insulating tube known ^ that contains a fabric ₅ whose wefts of a material of higher tensile strength and lighter: elongation and with a higher Martenstemperatur than those. Settfäden ". In this case, the weft threads are guided parallel to the surface line in the direction of the drill longitudinal axis extending stress direction. The wefts are made of glass fibers or an aromatic polyamide (araside) and the warp threads are made of fibers of a saturated polyester. The fabric is wound in several layers and a high wall thickness ratio is achieved without gaps or crevices during curing of the casting resin However, it is disadvantageous that the fabric is made from 2 different materials and that care must be taken during processing to ensure that the fabric is also used correctly in accordance with the stress classifications DS-OS 2631401 (B 29 D , 3/02) a plastic component is described with iextilverstärkung, wherein the reinforcing fabric

is a mixed fabric of polyester fibers and threads of an aromatic polyamide, wherein the tissue in both suture systems (calf and weft) is constructed identically in terms of the proportion of both fade at tan and in the loading sequence, in order to achieve excellent sterilization values.

The use of exclusively Arainidfasem as a flat surface provides highest tensile strength and good chemical resistance to fluoride-containing aggressive gases and liquids. However, the poor shear strength (compressive strength) and the poor machinability, the u, a, the use of special tools? and -tooixnologies. Sin another essential defect is the relative! "- Sensitivity ₅ which causes a degradation of the strength in the composite (DS-OS 2927653. B 29 D, 3/02),

The disadvantage of W-Lieht-Espfindlichkeit occurs inevitably even with your insulating material tube according to DE-AS 2264341 or, plastic component according to the DS-OS '263'14OI and requires appropriate covers and / or paint systems.

goal of

The object of the invention is to develop a fiber-reinforced plastic tube that is cost-effective to manufacture at high utility value characteristics. "

Essence of the invention: The technical task

The invention is based on the object _S, a pipe made of fiber-reinforced plastic using aromatic polyamide and saturated polyester as to text lien fabrics processed Fasarmatarial indicate in which an optimum of the ratio of tensile and shear strength is obtained, in which the negative influence of the UV Radiation are negligible and its mechanical workability can be described as good, aas is particularly suitable for use in SFr high-voltage equipment.

Features oF _- Invention:

The object is achieved erfindiings according to the fact that the inner reinforcement of the tube of alternating Schichtursgen of textlien fabrics, z, B, fabrics, made of fibers of an aromatic polyamide with those of fibers of a saturated polyester and that on the inside and the outside of the ear, the reinforcement is finished with at least one layer of the textile fabric of the fibers of the saturated polyester «

The arrangement of the various textlien fabrics made of organic fiber materials can be done so that simply superimposed sheets of Araaid and polyester fiber fabrics are spirally ineinanderge?, So that the structure of the reinforcement is a uniform change of the individual Araaid and polyester layers present »

The polyester web must be dimensioned so that it forms with one or more layers the outer end of the reinforcement,

According to strength and dimensioning requirements, the variation of the reinforcement present in the reinforcement may also be such that two or more layers of polyester are in continuous change with one layer of gradient and, conversely, one layer of polyester alternates with two or more layers of aramid. Another possibility for designing the tube with optimally adapted strength values is to provide the inner and outer terminations with one or more layers of polyester fabric, while in the core recess of the pipe exclusively aramid fabric is arranged in several continuously wound layers.

Ss is possible to make the design of the reinforcement to at least one basis of polyester fabric to about 50 % of the wall thickness on the inside compact multilayer than Aramid-Flächengabilde, while the outside is made of several layers of polyester fabric compactly wound.

For attachment of frets for forces inleitung, it is advantageous if at the two ends of the reinforcement additionally sum aramid Poiyester Flächengehilde during the wrapping process polyester belt corresponding waistband enters with. As a result of upgrading at these points by additionally introduced strip material, a feathering of the fabric at the edges is required.

The tube according to the invention is produced exclusively by the process of vacuum impregnation mitteis hot curing polyaddition crosslinking resins (epoxy resins).

The erfindungsgemäBe solution considerable advantages are achieved. Thus, in contrast to special fabrics with qualitatively different ear and weft threads, sieves allow the proportions of the components involved to be more favorable when combined with different surface structures in order to obtain optimum fixed-value values. "

By, the S'insatz of Iflächaiagabiiden based on polyester fibers in conjunction with those made of aramid fibers with the same dimensioning of the tube equal strength ratios compared to the use of pure Αιamid achieved as Flächengabiide in the composite, the high Zugfsstlgäeit and the good chemical resistance remain fully effective ,, Darübarhinaus result from meaningful arrangement of the components in the composite considerable improvements in UV behavior, ina3.a as effective protection aramid fibers odar several layers of the roiyester sheet as .Außenlagen are seen vosgesehen, It eliminates the additional operation of a painting as Protective coating * Furthermore, surprisingly, the problems of difficult machinability in such a composite material are eliminated, so that special measures of the technology of cutting such as -Dueben, Iräsen, separating. Taking into account the high W Tool wear can be avoided in favor of increased quality »

From guiding ungsb e ispie1%

The invention will be explained in more detail below on a Ausführungshe: game .. In the drawing show

3 ig, Λ : schematically the basic structure of an inventive Hohleta ι

Fig. 2 ί schematise - a variant of the structure of the drill;

B ¹ Ig * 3 ^: Scheaatically the construction, with wound on waistband in longitudinal section,

The ear after S ¹ Ig, 1 consists of one hardenable by polyaddition an impregnation, s, B. Spoxidharz, and the two as Varstäskungsmaterialian fungieranden textlien llächengebilden of polyester 1 and aramid 2, which are wound alternately übeieiaandeuliegand on a mandrel 4.

In the Hohü of FIG _e 2, the Ye ι strengthening is inside at least a base of polyester sheet 1 as the sheet of aramid 2 - wrapped in several layers - formed while outside a sheet in a plurality of layers of polyester 1 is wound on the winding mandrel. 4

In order to produce a collar 5 for the introduction of force, a polyester-polyester fabric 3 ... is additionally provided at the axial end of the reinforcement, which runs in between the individual layers during the winding process (5 ¹ Ig. 3);

Claims (4)

üff finaure s a-n spruch 1, . Tube made of fiber-reinforced plastic, in particular insulating material! ο fca: for high voltage devices by. Polyaddition of heat-curable impregnating resin with a multi-layer reinforcement of fibrous fibrous textile fabrics based on aromatic polyamides, so-called aramids, and saturated polyesters, characterized in that the reinforcement of the base consists of alternating layers of textile surface weaves, for example of woven fibers aromatic polyamide (1) with those consisting of the ester of a saturated polyester (2), and that on the inside and outside of the ear, strengthening with at least one layer of the textile surface of lasers of the saturated polyester is completed « 2, tube according to point 1, characterized in that the arrangement of the two surface structures is spirally in continuous change of both constructions. over the entire cross-section exists » 3 "Hohr to point 1, ge characterized by the fact that the arrangement of both components over the entire cross-section is discontinuous by zones of compact, consisting of several layers existing Flächenbailda made of fibers of aromatic polyamide with those based on ι οη saturated polyester fibers ao7? In "
(Fig. 2) 4 "Hohr nach Punkt Λ to 3" S eke η η ze Ic hnet characterized in that the attachment of AuSerfoünden for the purpose of Erafteinlaitung and power transmission on actuation in addition to the two components of textile sheet formations between the individual layers a fabric tape of saturated polyester is provided, that it runs in continuously during winding. / ττ> · _ i \ (ülge J) For this purpose: 1 pages drawings I