Ohm pipe with small pipe diameter

Abstract

The utility model relates to the technical field of vacuum infusion auxiliary materials, in particular to a small-pipe-diameter ohm pipe. A small-pipe-diameter ohmic pipe comprises a plurality of ohmic pipe unit pipes, and the ohmic pipe unit pipes are detachably and fixedly connected to form finished small-pipe-diameter ohmic pipes with different length size requirements. The Ohm tube unit tube comprises an Ohm profile tube and a bottom plate, the Ohm profile tube is detachably and fixedly connected to the bottom plate to form the Ohm tube unit tube, and a plurality of resin circulation holes are formed in the bottom plate in the length direction of the bottom plate; and the distances between the adjacent resin circulating holes are equal. The ohmic tube can be disassembled and assembled into ohmic tubes with various sizes and lengths, the requirements of a vacuum infusion RTM process can be better met, and the production cost of the vacuum infusion RTM process can be reduced; in addition, the inner diameter of the pipe is designed to be 16 mm, the internal space of the ohm pipe can be effectively reduced, and resin residues and losses are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of vacuum infusion auxiliary materials, and in particular to an ohmic tube with a small diameter. Background Art

[0002] The development of large-scale unit capacity in the wind power industry has become an inevitable trend. The overall solution of large-megawatt, high-reliability and high-economic-efficiency wind power projects is highly recognized in the market. Complete machine manufacturers with large-megawatt product capabilities will be more competitive in the market in the future. The progress of wind power technology is the basis for large-scale unit capacity. Large-scale unit capacity will effectively improve the utilization efficiency of wind energy resources, improve the overall economy of wind power project investment, development and operation, improve land / sea utilization efficiency, reduce the cost per kilowatt-hour, improve investment returns, and facilitate large-scale project development. It puts forward higher requirements for large-scale and lightweight wind turbine blades.

[0003] The main method of producing wind turbine blades is vacuum infusion molding. The vacuum infusion molding process is to lay the fiber-reinforced composite material directly on the mold, lay a peeling layer on the fiber-reinforced composite material, and lay a high-permeability medium on the peeling layer. Then, it is covered and sealed with a vacuum bag film. The vacuum pump is evacuated to a negative pressure state. Due to the large volume of the blade, the viscosity of the main raw material resin of FRP is relatively large. In order to make the resin quickly absorbed by the composite material, an ohm tube can be used to first transport the resin in the longitudinal direction to guide the main direction of the resin. After curing, the demoulding cloth is peeled off to obtain a high-density, low-glue layer structure.

[0004] In the production of wind turbine blades, the ohm tube is a tube arranged in a vacuum system to guide the resin so that it is evenly distributed and diffused. It can arrange the diversion network more quickly, save a lot of labor costs, and make the resin flow in a predetermined direction. The product has good temperature resistance and flexibility, and can be used for vacuum infusion RTM process to infuse resin and vacuumize. With the development of large-scale wind turbine blades, the increase in blade size will cause the original size of the ohm tube to be unable to meet production needs. In order to better meet the needs of vacuum infusion molding, the size of the ohm tube will also be adjusted. This requires re-molding to produce ohm tube products of different sizes, resulting in a high cost of using the existing ohm tube, which in turn affects the production cost of large-scale wind turbine blades, which is not conducive to the control of wind power cost per kilowatt-hour and the development of the wind power industry. Utility Model Content

[0005] In order to solve the problem of poor thermal insulation performance of existing rock wool boards, the present application provides an ohmic tube with a small diameter.

[0006] The small-diameter ohmic tube provided in this application is realized by the following technical solutions:

[0007] A small-diameter ohmic tube includes several ohmic tube unit tubes. The several ohmic tube unit tubes are detachably and fixedly connected to form a finished small-diameter ohmic tube with different length size requirements. The ohmic tube unit tube includes a Ω-shaped profile tube and a bottom plate. The Ω-shaped profile tube is detachably and fixedly connected to the bottom plate to form an ohmic tube unit tube. The bottom plate is provided with several resin circulation holes along its own length direction. The distance between adjacent resin circulation holes is equal.

[0008] This application can be disassembled and assembled into ohmic tubes of various sizes and lengths, can better meet the requirements of the vacuum infusion RTM process, and can reduce the production cost of the vacuum infusion RTM process.

[0009] Preferably, the inner diameter of the Ω-shaped profile tube is 16 mm, and the outer diameter of the Ω-shaped profile tube is 18 mm.

[0010] The application designs the inner diameter of the pipe to be 16 mm, which can effectively reduce the internal space of the ohmic tube, reduce resin residue and loss.

[0011] Preferably, the port diameter of the resin circulation hole on the upper surface of the bottom plate is 1.02 - 1.08 times that of the port diameter of the resin circulation hole on the lower surface of the bottom plate.

[0012] Preferably, a chamfer A is formed at the port of the resin circulation hole on the upper surface of the bottom plate; a chamfer B is formed at the port of the resin circulation hole on the lower surface of the bottom plate.

[0013] By adopting the above technical scheme, it is convenient for the resin to flow quickly in the ohmic tube, and at the same time, the resin residue and loss can be reduced.

[0014] Preferably, several T-shaped grooves are integrally formed on the upper surface of the bottom plate; a T-shaped connecting strip is integrally formed on the bottom surface of the Ω-shaped profile tube; the T-shaped connecting strip of the Ω-shaped profile tube is fitted into the T-shaped groove of the bottom plate, so that the Ω-shaped profile tube is detachably and fixedly connected to the bottom plate to form an ohmic tube unit tube.

[0015] By adopting the above technical scheme, it is convenient for the disassembly, assembly and maintenance of the ohmic tube unit tube, and it is also convenient to regularly clean the inside of the Ω-shaped profile tube in the ohmic tube unit tube, and the resin residue and loss can be reduced.

[0016] Preferably, a first semi-circular groove is integrally formed on the upper surface of the bottom plate; a second semi-circular groove is integrally formed on the bottom surface of the Ω-shaped profile tube; the first semi-circular groove and the second semi-circular groove form a sealing tape installation groove; a sealing tape is filled between the Ω-shaped profile tube and the bottom plate; the sealing tape is filled in the sealing tape installation groove.

[0017] By adopting the above technical solution, the overall sealing performance of the ohm tube unit tube can be improved, and the surface resin overflows from the gap between the Ω profile tube and the bottom plate of the ohm tube unit tube.

[0018] Preferably, a connecting ring body is integrally formed on the side surface of one end of the Ω profile tube, and a connecting ring groove is integrally formed on the side surface of the other end; the connecting ring body of a certain Ω profile tube is seamlessly embedded in the connecting ring groove of the adjacent Ω profile tube.

[0019] Preferably, disassembly holes are integrally formed at both side ends of the base plate along its length direction; the base plate is threadedly connected with fastening bolts; and a number of the ohm tube unit tubes are detachably and fixedly connected by the fastening bolts to form finished small-diameter ohm tubes with different length requirements.

[0020] By adopting the above technical solution, it is convenient to quickly disassemble and assemble finished small-diameter ohmic tubes with different length requirements, which can better meet the requirements of the vacuum infusion RTM process and reduce the production cost of the vacuum infusion RTM process.

[0021] Preferably, the Ω profile tube and the bottom plate are both made of polypropylene.

[0022] By adopting the above technical solution, the maximum operating temperature of polypropylene can reach 150°C, so that the ohm tube made of polypropylene can prevent softening and deformation caused by excessive temperature. Polypropylene has a low density, better mechanical properties than polyethylene, and outstanding rigidity, making the ohm tube easier to lay; polypropylene has high tensile strength and good bending resistance, giving the ohm tube better mechanical strength. In addition, polypropylene is a non-polar material, with low friction with polar resins and low resistance to resin flow. The ohm tube made of polypropylene can quickly drain the resin to various parts of the blade, improving the production efficiency of the vacuum infusion RTM process.

[0023] Preferably, the interior of the Ω profile tube is spray-molded with a PTFE coating A; and the upper surface of the base plate is spray-molded with a PTFE coating B.

[0024] By adopting the above technical solution, the resin residue and loss can be effectively reduced.

[0025] In summary, this application has the following advantages:

[0026] 1. The present application can be disassembled and assembled into ohmic tubes of various sizes and lengths, which can better meet the requirements of the vacuum infusion RTM process and reduce the production cost of the vacuum infusion RTM process.

[0027] 2. The small-diameter ohm tube assembled in this application is designed with an inner diameter of 16 mm, which can effectively reduce the internal space of the ohm tube and reduce resin residue and loss.

[0028] 3. The ohmic tube in this application is made of polypropylene, which has excellent heat resistance and mechanical properties. Moreover, it has low friction with polar resins and low resistance to resin flow. The ohmic tube made of polypropylene can enable the resin to quickly drain to various parts of the blade, improving the production efficiency of the vacuum infusion RTM process. Brief Description of the Drawings

[0029] Figure 1 It is a schematic diagram of the overall structure of the finished small-diameter ohmic tube in the embodiment of this application.

[0030] Figure 2 It is a schematic diagram of the structure of the ohmic tube unit tube in the embodiment of this application.

[0031] In the figure, 1 is the ohmic tube unit tube; 2 is the Ω-shaped profile tube; 20 is the PTFE coating A; 21 is the T-shaped connecting strip; 22 is the second semi-circular groove; 23 is the connecting ring body; 24 is the connecting ring groove; 3 is the bottom plate; 30 is the PTFE coating B; 300 is the sealing strip installation groove; 31 is the resin circulation hole; 311 is the chamfer A; 312 is the chamfer B; 32 is the T-shaped groove; 33 is the first semi-circular groove; 34 is the disassembly and assembly hole position; 35 is the fastening bolt; 36 is the hidden cover plate; 4 is the sealing strip. Detailed Embodiment

[0032] The following further describes this application in detail with reference to the drawings and embodiments. Embodiment

[0033] Refer to Figure 1 , a small-diameter ohmic tube includes several ohmic tube unit tubes 1, and several ohmic tube unit tubes 1 are detachably and fixedly connected to form a finished small-diameter ohmic tube with different length size requirements.

[0034] The ohmic tube unit tube 1 is made of polypropylene. The maximum service temperature of polypropylene can reach 150 °C, so that the ohmic tube made of polypropylene can prevent softening and deformation caused by too high temperature. Polypropylene has a small density, better mechanical properties than polyethylene, and very prominent rigidity, making the ohmic tube easier to lay; polypropylene has high tensile strength and good bending resistance, giving the ohmic tube better mechanical strength. Moreover, polypropylene is a non-polar material, with low friction with polar resins and low resistance to resin flow. The ohmic tube made of polypropylene can enable the resin to quickly drain to various parts of the blade, improving the production efficiency of the vacuum infusion RTM process.

[0035] Refer to Figure 1 and Figure 2, the ohmic tube unit tube 1 includes an Ω-profile tube 2 and a bottom plate 3, and the Ω-profile tube 2 is detachably and fixedly connected to the bottom plate 3 to form the ohmic tube unit tube 1. The inner diameter of the Ω-profile tube 2 is 16 mm, and the outer diameter of the Ω-profile tube 2 is 18 mm. The bottom plate 3 is provided with a plurality of resin circulation holes 31 along its own length direction, and the distance between adjacent resin circulation holes 31 is equal. The diameter of the port of the resin circulation hole 31 located on the upper surface of the bottom plate 3 is 1.02 - 1.08 times the diameter of the port of the resin circulation hole 31 located on the lower surface of the bottom plate 3, which is convenient for the resin to flow quickly in the ohmic tube and can reduce resin residue and loss.

[0036] The aperture specifications of the resin circulation holes 31 on the bottom plate 3 located at the ports on the lower surface of the bottom plate 3 include 1.0 ± 0.05 mm, 1.50 ± 0.05 mm, 2.0 ± 0.05 mm, 2.5 ± 0.05 mm, 3.0 ± 0.05 mm, 4.0 ± 0.05 mm, 5.0 ± 0.05 mm.

[0037] When the aperture specification of the resin circulation hole 31 on the bottom plate 3 located at the port on the lower surface of the bottom plate 3 is 1.0 ± 0.05 mm, the bottom plate 3 is integrally formed with three rows of resin circulation holes 31 that are spaced apart from each other and have equal distances. The center distance between adjacent resin circulation holes 31 is 3 ± 0.05 mm.

[0038] When the aperture specification of the resin circulation hole 31 on the bottom plate 3 located at the port on the lower surface of the bottom plate 3 is 4.0 ± 0.05 mm, the bottom plate 3 is integrally formed with one row of resin circulation holes 31 that are spaced apart from each other and have equal distances. The center distance between adjacent resin circulation holes 31 is 12 ± 0.05 mm.

[0039] The aperture specification of the resin circulation hole 31 on the bottom plate 3 located at the port on the lower surface of the bottom plate 3 is customized according to actual usage requirements.

[0040] The width of the bottom plate 3 is 38 ± 1 mm, and the length specifications of the bottom plate 3 include 200 ± 2 mm, 250 ± 2 mm, 300 ± 2 mm, 500 ± 2 mm, 1000 ± 2 mm, 2000 ± 2 mm, 5000 ± 2 mm. The thickness specification of the bottom plate 3 is 4 ± 1 mm. In the ohmic tube unit tube 1 of this embodiment, the thickness of the bottom plate 3 is 4 mm.

[0041] Refer to Figure 2 , in order to reduce the residue and loss of resin during the use of the small-diameter ohmic tube, a PTFE coating A20 is spray-formed inside the Ω-profile tube 2. A PTFE coating B30 is spray-formed on the upper surface of the bottom plate 3. The PTFE coating B30 is located inside the ohmic tube unit tube 1, and the upper surface of the bottom plate 3 outside the ohmic tube unit tube 1 is not spray-formed with the PTFE coating B30.

[0042] Refer to Figure 1 and Figure 2, the detachable and fixed connection method between the Ω-shaped profile tube 2 and the bottom plate 3 is as follows: Several T-shaped grooves 32 are integrally formed on the upper surface of the bottom plate 3. A T-shaped connecting strip 21 is integrally formed on the bottom surface of the Ω-shaped profile tube 2. The T-shaped connecting strip 21 of the Ω-shaped profile tube 2 is fitted into the T-shaped groove 32 of the bottom plate 3, so that the Ω-shaped profile tube 2 is detachably and fixedly connected to the bottom plate 3 to form the ohmic tube unit tube 1.

[0043] Refer to Figure 1 and Figure 2 , in order to improve the connection sealing performance between the Ω-shaped profile tube 2 and the bottom plate 3, a first semi-circular groove 33 is integrally formed on the upper surface of the bottom plate 3. A second semi-circular groove 22 is integrally formed on the bottom surface of the Ω-shaped profile tube 2. The first semi-circular groove 33 and the second semi-circular groove 22 form a sealing strip installation groove 300. A sealing strip 4 is filled between the Ω-shaped profile tube 2 and the bottom plate 3. The sealing strip 4 is made of butyl rubber. The sealing strip 4 is filled in the sealing strip installation groove 300 to improve the connection sealing performance between the Ω-shaped profile tube 2 and the bottom plate 3.

[0044] Refer to Figure 1 and Figure 2 , a connecting ring body 23 is integrally formed on one end side surface of the Ω-shaped profile tube 2, and a connecting ring groove 24 is integrally formed on the other end side surface. The connecting ring body 23 of a certain Ω-shaped profile tube 2 is seamlessly fitted into the connecting ring groove 24 of the adjacent Ω-shaped profile tube 2. Disassembly and assembly hole positions 34 are integrally formed on both side ends of the bottom plate 3 along its own length direction. A fastening bolt 35 is threadedly connected to the bottom plate 3. First, the adjacent ohmic tube unit tubes 1 are assembled into a semi-finished small-diameter ohmic tube with a predetermined length dimension requirement through the connecting ring groove 24 and the connecting ring body 23, and then the fastening bolt 35 passes through all the ohmic tube unit tubes 1 to detachably and fixedly connect several ohmic tube unit tubes 1 to form a finished small-diameter ohmic tube with different length dimension requirements.

[0045] Refer to Figure 1 and Figure 2 , the disassembly and assembly hole positions 34 can be through holes or threaded holes. When the disassembly and assembly hole positions 34 are through holes, after the fastening bolt 35 passes through all the ohmic tube unit tubes 1, the end opposite to the nut of the fastening bolt 35 is fixed by a fastening screw, and several ohmic tube unit tubes 1 are detachably and fixedly connected to form a finished small-diameter ohmic tube with different length dimension requirements. When the disassembly and assembly hole positions 34 are threaded holes, the fastening bolt 35 is threadedly connected and fixed to the disassembly and assembly hole positions 34 of all the ohmic tube unit tubes 1. In order to make the small-diameter ohmic tube more beautiful, counterbores are formed at both ports of the disassembly and assembly hole positions 34 of a single ohmic tube unit tube 1, and the fastening bolt 35 is hidden in the counterbores. When a fastening screw is needed, the fastening screw is also hidden in the counterbores. After the installation of the fastening bolt 35 is completed, hidden cover plates 36 are snap-fitted to both ends of the disassembly and assembly hole positions 34, and then the assembly of the small-diameter ohmic tube can be completed.

[0046] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A small diameter ohmic tube, characterized in that: The invention comprises a plurality of ohmic tube unit tubes (1), wherein the plurality of ohmic tube unit tubes (1) are detachable and fixedly connected to form a finished small-diameter ohmic tube having different length and size requirements; the ohmic tube unit tube (1) comprises an Ω profile tube (2) and a bottom plate (3), wherein the Ω profile tube (2) is detachable and fixedly connected to the bottom plate (3) to form the ohmic tube unit tube (1), and the bottom plate (3) is provided with a plurality of resin flow holes (31) along its length direction; and the spacing between adjacent resin flow holes (31) is equal.

2. The small-diameter ohmic tube according to claim 1, characterized in that: The inner diameter of the Ω profile tube (2) is 16 mm, and the outer diameter of the Ω profile tube (2) is 18 mm.

3. The small-diameter ohmic tube according to claim 1, characterized in that: The diameter of the port of the resin circulation hole (31) located on the upper surface of the bottom plate (3) is 1.02-1.08 times the diameter of the port of the resin circulation hole (31) located on the lower surface of the bottom plate (3).

4. The small-diameter ohmic tube according to claim 3, characterized in that: The resin circulation hole (31) is located at the upper surface port of the bottom plate (3) and is formed with a chamfer A (311); the resin circulation hole (31) is located at the lower surface port of the bottom plate (3) and is formed with a chamfer B (312).

5. The small-diameter ohmic tube according to claim 4, characterized in that: The upper surface of the bottom plate (3) is integrally formed with a plurality of T-shaped grooves (32); the bottom surface of the Ω profile tube (2) is integrally formed with a T-shaped connecting strip (21); the T-shaped connecting strip (21) of the Ω profile tube (2) is engaged with the T-shaped groove (32) of the bottom plate (3), so that the Ω profile tube (2) can be detachably and fixedly connected to the bottom plate (3) to form an ohmic tube unit tube (1).

6. The small-diameter ohmic tube according to claim 5, characterized in that: The upper surface of the bottom plate (3) is integrally formed with a first semicircular groove (33); the bottom surface of the Ω profile tube (2) is integrally formed with a second semicircular groove (22); the first semicircular groove (33) and the second semicircular groove (22) form a sealing belt installation groove (300); a sealing belt (4) is filled between the Ω profile tube (2) and the bottom plate (3); and the sealing belt (4) is filled in the sealing belt installation groove (300).

7. The small-diameter ohmic tube according to claim 1, characterized in that: The Ω profile tube (2) has a connecting ring body (23) integrally formed on one end side surface, and a connecting ring groove (24) integrally formed on the other end side surface; the connecting ring body (23) of a certain Ω profile tube (2) is seamlessly embedded in the connecting ring groove (24) of the adjacent Ω profile tube (2).

8. The small-diameter ohmic tube according to claim 7, characterized in that: The bottom plate (3) has disassembly holes (34) integrally formed at both side ends along its length direction; the bottom plate (3) is threadedly connected with fastening bolts (35); a plurality of ohm tube unit tubes (1) are detachably and fixedly connected by the fastening bolts (35) to form finished small-diameter ohm tubes with different length and size requirements.

9. The small-diameter ohmic tube according to claim 1, characterized in that: The Ω profile tube (2) and the bottom plate (3) are both made of polypropylene material.

10. The small-diameter ohmic tube according to claim 1, characterized in that: The Ω profile tube (2) is internally sprayed with a PTFE coating A (20); and the upper surface of the base plate (3) is sprayed with a PTFE coating B (30).

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