Electrical insulation glass fiber reinforced plastic cylinder with half wrapping structure

Abstract

The utility model discloses an electrical insulation glass fiber reinforced plastic cylinder with a Haff wrapping structure, which comprises a body, the body comprises a polyester surface felt layer, fiber yarn layers and a fiber cloth layer, the polyester surface felt layer is completely wrapped on the innermost side through the Haff wrapping structure, the middle fiber yarn layer uniformly covers the polyester surface felt layer, and the fiber cloth layer is wrapped on the middle fiber yarn layer. And the fiber cloth layer is completely wrapped on the outermost side in a Haff structure. The electrical insulation glass fiber reinforced plastic cylinder with the Haff wrapping structure has the advantages of good electrical performance, high mechanical strength, short production period, low labor and energy consumption, low cost and the like.

Description

Technical Field

[0001] The utility model relates to a glass fiber reinforced plastic cylinder for electrical insulation with a half-wrapped structure. Background Art

[0002] The fiberglass cylinder for electrical insulation is generally used for the main body of the insulating parts in power stations, electrical equipment or transmission lines, and plays a supporting and insulating role. The fiberglass cylinder for electrical insulation with the half-wrapped structure of the utility model is mainly used for the main body of the gas-filled or oil-filled electrical insulation parts with a voltage level of 110kV and above and an inner diameter greater than 120mm.

[0003] At present, the main bodies of insulating parts with voltage levels of 110kV and above and inner diameters greater than 120mm on the market basically adopt the winding process, that is, multiple strands of fiber yarns are impregnated with epoxy resin and wound on a core mold in different arrangements such as annular or spiral, then cured at high temperature, and then cut and processed into shape.

[0004] The structure formed by the winding has the following disadvantages:

[0005] 1. The mechanical and electrical performance is not high. Since the entire structure is almost completely exposed to the air during the winding process, a large number of bubbles will be introduced during the production process and cannot be eliminated. After solidification, a large number of pores or voids will remain inside the FRP cylinder, resulting in the FRP cylinder being not dense enough.

[0006] 2. The production process is complicated and the production cycle is long. A fiberglass tube needs to go through four stages: winding, curing, cutting and turning. There are many processes and the production time is long.

[0007] 3. Large waste of materials and energy, high cost. Structural winding requires processing margins at both ends and outside of the FRP cylinder, resulting in a large waste of materials. At the same time, the curing process requires long-term high temperature, so the energy consumption is relatively high.

[0008] 4. It causes great pollution to the environment. The processed fiberglass waste cannot be recycled and is not easy to degrade in the environment.

[0009] There are also FRP cylinders produced by pultrusion in the market, but they can only be used for products with small diameters or no internal pressure requirements. This is because the fiber yarn only has axial direction during pultrusion, and no circumferential reinforcement, resulting in low internal pressure load. The cylinder is prone to cracking when under pressure, so it cannot be used as the main body of an inflatable or oil-filled electrical insulation part with high pressure requirements. Summary of the invention

[0010] The utility model provides a glass fiber reinforced plastic cylinder for electrical insulation with a half-wrapped structure in order to solve the problems existing in the prior art.

[0011] The technical solutions adopted in this utility model are:

[0012] A glass fiber reinforced plastic cylinder for electrical insulation with a Haff wrapped structure comprises a main body, wherein the main body comprises a polyester surface felt layer, a fiber yarn layer and a fiber cloth layer, wherein the polyester surface felt layer is completely wrapped at the innermost side with the Haff structure, the middle fiber yarn layer is evenly covered on the polyester surface felt layer, and the fiber cloth layer is completely wrapped at the outermost side with the Haff structure.

[0013] Furthermore, the polyester surface felt layer, the fiber yarn layer and the fiber cloth layer are integrated after being cured by epoxy resin.

[0014] Furthermore, the fiber yarn layer is formed by pultrusion after glass fiber yarn is impregnated with epoxy resin.

[0015] Furthermore, the polyester surface felt layer is provided in one layer, and the fiber cloth layer is provided in one layer or multiple layers.

[0016] The utility model has the following beneficial effects:

[0017] 1) The utility model has excellent electrical performance and high mechanical strength. The stacking and wrapping of yarn and cloth facilitates the complete impregnation of epoxy resin, and the high pressure during the pultrusion process can squeeze out excess air and epoxy material. The internal structure is very dense, bubble-free, with better electrical performance and higher mechanical strength. At the same time, the fiber cloth wrapped on the outside effectively solves the problem that the pultruded tube is easy to crack when under pressure, and is more suitable for occasions with high pressure requirements.

[0018] 2) The polyester surface felt layer of the inner half wrapping structure of the utility model can effectively isolate the fiber material from being corroded by transformer oil and sulfur hexafluoride gas, thereby expanding the application range of the glass fiber reinforced plastic pipe and extending its service life.

[0019] 3) The utility model has a very short production cycle, very high production efficiency and very low cost. Since the middle fiber yarn layer is pultruded, the equipment has a high degree of automation, can be produced continuously, has a short production cycle, and consumes less labor and energy.

[0020] 4) The utility model has little environmental pollution. During the entire production process, the glass fiber reinforced plastic cylinder has a very high dimensional accuracy, does not require additional processing, and there is no waste of excess materials during the process, so it is more in line with the requirements of low-carbon and environmentally friendly development. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the utility model. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings.

[0023] like Figure 1The utility model discloses a glass fiber reinforced plastic cylinder for electrical insulation with a half-wrapped structure, comprising a main body, the main body comprising a polyester surface felt layer 1, a fiber yarn layer 2 and a fiber cloth layer 3, the three being formed into one body after being cured with epoxy resin, wherein the fiber yarn layer 2 is pultruded by impregnating glass fiber yarn with epoxy resin, the polyester surface felt layer 1 is formed by a polyester surface felt layer, and the fiber cloth layer 3 is formed by fiber cloth (the polyester fiber felt and the fiber cloth are not put into the glue groove, but are fixed by the epoxy resin in the fiber yarn after impregnation).

[0024] The polyester surface felt layer 1 is completely wrapped at the innermost side in a Haff structure, the middle fiber yarn layer 2 is evenly covered on the polyester surface felt layer 1, and the fiber cloth layer 3 is completely wrapped at the outermost side in a Haff structure. The polyester surface felt layer 1 is provided in one layer, and the fiber cloth layer 3 is provided in one or more layers.

[0025] Before production, the polyester surface felt layer, fiber yarn and fiber cloth are arranged on the corresponding yarn racks respectively. During production, the two polyester surface felt layers are first completely wrapped on the core mold with a half structure and enter a trumpet-shaped pre-forming mold. Multiple strands of glass fiber yarn enter the vacuum-treated epoxy resin glue pool, fully rolled and infiltrated, enter the pre-forming mold, and are evenly distributed around the polyester surface felt layer. Then the fiber cloth enters the pre-forming mold and completely wraps the outermost layer of the glass fiber yarn with a half structure. The polyester surface felt layer, fiber yarn layer and fiber cloth layer are rolled and compressed through pre-forming, and the pultrusion mold of a specific size is pulled forward by the traction equipment while being cured by the high temperature in the oven to form a cylinder. The glass fiber reinforced plastic cylinder can be produced continuously and can be cut into the required size.

[0026] Compared with the FRP cylinder produced by the winding process commonly used in the market, the FRP cylinder of this utility model has a denser internal structure and superior electrical and mechanical properties of the material. See Table 1.

[0027] Table 1 Comparison of material properties of two types of FRP

[0028]

[0029] In addition to the above-mentioned improvements in material performance, the production efficiency of Huff wrapped structure FRP is higher, and there is also a great saving in materials and energy, with less pollution to the environment. Taking the FRP cylinder with an inner diameter of 220mm, a wall thickness of 10mm, and a length of 2000mm as an example, the comparison between the wound and new Huff wrapped structure FRP is shown in Table 2 below.

[0030] Table 2 Comparison of efficiency of two types of FRP

[0031]

[0032] For some occasions where the mechanical strength requirements are particularly high, the fiberglass cylinder for electrical insulation of the half wrapped structure of the utility model can also add one or more fiber cloth layers to the fiber yarn layer in the middle of the fiberglass cylinder. The materials used can be flexibly combined, which can be a combination of glass fiber cloth and glass fiber yarn, a combination of aramid fiber cloth and glass fiber yarn, or a combination of fiber cloth and fiber yarn of other similar materials.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A glass fiber reinforced plastic cylinder for electrical insulation with a half-wrapped structure, characterized in that: The invention comprises a main body, wherein the main body comprises a polyester surface felt layer (1), a fiber yarn layer (2) and a fiber cloth layer (3), wherein the polyester surface felt layer (1) is completely wrapped at the innermost side with a Hough structure, the middle fiber yarn layer (2) is evenly covered on the polyester surface felt layer (1), and the fiber cloth layer (3) is completely wrapped at the outermost side with a Hough structure.

2. The glass fiber reinforced plastic cylinder for electrical insulation of the half wrapped structure according to claim 1, characterized in that: The polyester surface felt layer (1), the fiber yarn layer (2) and the fiber cloth layer (3) are integrated after being cured with epoxy resin.

3. The glass fiber reinforced plastic cylinder for electrical insulation of the half wrapped structure according to claim 2, characterized in that: The fiber yarn layer (2) is formed by pultrusion of glass fiber yarn impregnated with epoxy resin.

4. The glass fiber reinforced plastic cylinder for electrical insulation of the half wrapped structure according to claim 1, characterized in that: The polyester surface felt layer (1) is provided in one layer, and the fiber cloth layer (3) is provided in one layer or multiple layers.

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