Vacuum sealing device for blade root metal flange end face

Abstract

The utility model discloses a blade root metal flange end face vacuum sealing device, which relates to the technical field of wind power blade manufacture and comprises a blade root flange body, an embedded bolt hole arranged on the blade root flange body, an embedded bolt sleeve arranged in the embedded bolt hole and a metal flange dense bolt arranged in the embedded bolt sleeve. The metal flange dense bolt comprises a bolt rod, a hexagon head, a lead screw and a sealing ring. The hexagonal head is arranged at one end of the bolt rod, the lead screw is arranged at the other end of the bolt rod, the bolt rod, the hexagonal head and the lead screw are integrally formed, a groove is formed in the side, facing the lead screw, of the hexagonal head, the sealing ring is arranged in the groove, the inner wall of the sealing ring is attached to the outer wall of the bolt rod, and the sealing ring is placed in the groove. After the metal flange is installed through the dense bolt, a flange sealing rubber strip does not need to be used for winding, the labor cost can be saved, and the phenomena of air leakage, air inflow and the like in the blade root resin pouring process are effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power blade manufacturing, in particular to a blade root metal flange end face vacuum sealing device. Background Art

[0002] Wind turbine blades are the most important parts of wind turbines. A safe and reliable blade molding process is the key to ensuring the long-term stable operation of wind turbines. The most common failure form in the blade molding process is air leakage and pressure relief during vacuum infusion, especially in the blade root area. Once air leakage occurs, it involves many layers of fabric, making it difficult to repair and difficult to ensure the quality after repair. Therefore, super-large offshore wind turbine blades usually prefabricate the blade roots separately. Therefore, ensuring that the prefabricated blade roots have good sealing during molding and do not generate air leakage risks is of great significance to improving the quality of wind turbine blades.

[0003] Prefabricated blade root forming process steps;

[0004] Prefabricated blade root process: The blade root is the most important part of the connection between the blade and the wind turbine hub. To ensure the stability of the blade connection, the strength requirements of the blade root structure are fully considered during the design process. Therefore, the thickness of the fiberglass cloth layer required to be laid in this area is several times that of other areas, which brings great challenges to the infusion. To ensure that the cloth layer in the blade root area can be fully impregnated with resin, super-large offshore wind turbine blades usually adopt the blade root preforming process, and 60% of the original design of the blade root is prefabricated separately;

[0005] Embedded bolt sleeve process: The bolt sleeve is pre-embedded in the blade root end face, with the bolt thread embedded inside, so the bolt can be installed without drilling holes in the blade root;

[0006] Vacuum sealing process of blade root metal flange: The most critical step in determining the quality of the prefabricated blade root molding process is the sealing of the metal flange. Any leakage point that causes air to enter is a fatal defect for the product. Therefore, using special sealing strips to make a reasonable and comprehensive sealing layout of the metal flange is the key to avoiding the risk of air leakage;

[0007] There are three key interfaces in the sealing of the metal flange, namely, the flange and the mold end face, the flange and the bolt end face, and the flange and the embedded bolt sleeve end face; the existing fitting clearance between the flange and the end face is usually 1-3mm, and the maximum height of the traditional silicone strip protruding from the flange is 3mm. Due to the poor compressibility of the silicone strip, the fitting clearance may exceed the original clearance after installation, which increases the risk of air leakage; and the traditional sealing process requires the flange sealing strip to be wrapped around each bolt, which is labor-intensive and reduces production efficiency;

[0008] In summary, we propose a blade root metal flange end face vacuum sealing device. Summary of the invention

[0009] The utility model aims to provide a blade root metal flange end face vacuum sealing device, so that the end face does not need to be wrapped with flange sealing strips, which can save labor costs and effectively prevent air leakage, air intake and the like during the resin injection process of the blade root.

[0010] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a blade root metal flange end face vacuum sealing device, comprising a blade root flange body, an embedded bolt hole arranged on the blade root flange body, an embedded bolt sleeve arranged in the embedded bolt hole, and a metal flange tight bolt arranged in the embedded bolt sleeve; the metal flange tight bolt comprises a bolt rod, a hexagonal head, a screw rod, and a sealing ring; the hexagonal head is arranged at one end of the bolt rod, and the screw rod is arranged at the other end of the bolt rod, the bolt rod, the hexagonal head, and the screw rod are integrally formed, the hexagonal head is provided with a groove on the inside facing the screw rod side, the sealing ring is arranged in the groove, and the inner wall of the sealing ring is in contact with the outer wall of the bolt rod.

[0011] In order to ensure the sealing degree, as a preferred vacuum sealing device of the blade root metal flange end face of the utility model, a hollow cavity is opened inside the interlayer of the sealing ring.

[0012] In order to adapt well to the uneven gap between the flange and the end face of the mold, as a preferred blade root metal flange end face vacuum sealing device of the utility model, a groove is protruded on one side of the sealing ring.

[0013] In order to facilitate the fixing of the blade root flange body, a blade root metal flange end face vacuum sealing device of the utility model preferably further includes a bracket, the bracket is a U-shaped structure, and the blade root flange body is vertically arranged in the bracket.

[0014] In order to enhance the bearing strength of the bracket, as a preferred embodiment of a blade root metal flange end face vacuum sealing device of the utility model, reinforcing ribs are obliquely provided on both sides of the interior of the bracket.

[0015] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0016] The utility model has a groove on the hexagonal head of the metal flange bolt, and a sealing ring is placed in the groove. After the metal flange bolt is threadedly installed in the embedded bolt sleeve on the flange, it is no longer necessary to wrap the flange sealing strip, which can save labor costs and effectively prevent air leakage and air intake during the resin injection process of the blade root.

[0017] The sealing ring of the utility model is designed as a hollow sealing silicone strip to replace the traditional solid sealing silicone strip. The hollow design can not only ensure the sealing degree, but also alleviate the poor compressibility of the silicone strip. It can well adapt to the uneven gap between the flange and the end face of the mold, and increase the maximum value of the protruding flange height to 3.5mm, further improving the tolerance range, so that the adaptation gap will not exceed the original gap, reducing the risk of air leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the metal flange bolt of the utility model;

[0020] Figure 3 for Figure 2 A right view structural diagram of ;

[0021] Figure 4 for Figure 1 AA structural diagram;

[0022] Figure 5 It is a schematic cross-sectional structure diagram of the sealing ring of the utility model.

[0023] In the figure: 1. Blade root flange body; 2. Embedded bolt hole; 3. Embedded bolt sleeve; 4. Metal flange tight bolt; 5. Bolt rod; 6. Hexagonal head; 7. Screw rod; 8. Sealing ring; 9. Groove; 10. Hollow cavity; 11. Bracket; 12. Reinforcement rib. DETAILED DESCRIPTION

[0024] See also Figures 1 to 5 A blade root metal flange end face vacuum sealing device comprises a blade root flange body 1, an embedded bolt hole 2 arranged on the blade root flange body 1, an embedded bolt sleeve 3 arranged in the embedded bolt hole 2, and a metal flange tight bolt 4 arranged in the embedded bolt sleeve 3; the metal flange tight bolt 4 comprises a bolt rod 5, a hexagonal head 6, a screw rod 7, and a sealing ring 8; the hexagonal head 6 is arranged at one end of the bolt rod 5, and the screw rod 7 is arranged at the other end of the bolt rod 5, the bolt rod 5, the hexagonal head 6, and the screw rod 7 are integrally formed, and a groove 9 is opened inside the hexagonal head 6 facing the screw rod 7 side, the sealing ring 8 is arranged in the groove 9, and the inner wall of the sealing ring 8 is in contact with the outer wall of the bolt rod 5.

[0025] In this embodiment: the hexagonal head 6 and the screw rod 7 are respectively arranged at the two ends of the bolt rod 5, and are integrally formed. A groove 9 is processed on the inner side of the hexagonal head 6, and the sealing ring 8 is placed in the groove 9; the metal flange tight bolt 4 is rotated into the embedded bolt sleeve 3, and one end of the screw rod 7 is threadedly connected with the embedded bolt sleeve 3. Through the sealing ring 8, the sealing performance between the hexagonal head 6 and the blade root flange body 1 is enhanced, which can effectively avoid pressure relief when the equipment is abnormal, add a line of defense, and further improve the stability of the device seal; there is no need to wrap it with flange sealing strips, which can save labor costs and effectively prevent air leakage and air intake during the resin infusion process of the blade root; and the blade root flange body 1 is wrapped with a double-layer vacuum bag film (the metal flange tight bolt 4 is also located in the double-layer vacuum bag film), and the vacuum pump is connected to the double-layer vacuum bag film through a pipeline, and the vacuum pump is started, and then tightened and sealed, which largely avoids the occurrence of air leakage and pressure relief;

[0026] The sealing ring 8 is designed to be a hollow sealing silicone strip to replace the traditional solid sealing silicone strip. The hollow design can not only ensure the sealing degree, but also alleviate the poor compressibility of the silicone strip. It can well adapt to the uneven gap between the flange and the mold end face, and increase the maximum value of the protruding flange height to 3.5mm, further improving the tolerance range, so that the adaptation gap will not exceed the original gap, reducing the risk of air leakage.

[0027] As a technical optimization solution of the present invention, a hollow cavity 10 is provided inside the interlayer of the sealing ring 8 .

[0028] In this embodiment: a hollow cavity 10 is opened inside the interlayer of the sealing ring 8, and a hollow sealing silicone strip replaces the traditional solid sealing silicone strip. The hollow design can not only ensure the sealing degree, but also alleviate the poor compressibility of the silicone strip.

[0029] As a technical optimization solution of the utility model, a groove 9 protrudes from one side of the sealing ring 8.

[0030] In this embodiment: a groove 9 protrudes from one side of the sealing ring 8, and the maximum height of the sealing ring 8 protruding from the flange is increased to 3.5 mm, further improving the tolerance range, which can well adapt to the uneven gap between the flange and the end face of the mold.

[0031] As a technical optimization solution of the utility model, it also includes a bracket 11 . The bracket 11 is a U-shaped structure, and the blade root flange body 1 is vertically arranged in the bracket 11 .

[0032] In this embodiment, the blade root flange body 1 is easily supported and fixed by the bracket 11 .

[0033] As a technical optimization solution of the present invention, reinforcing ribs 12 are obliquely arranged on both sides of the inside of the bracket 11 .

[0034] In this embodiment, the reinforcing ribs 12 are used to further strengthen the support strength of the bracket 11 to ensure the stability of the blade root flange body 1 .

[0035] Working principle: a groove 9 is processed on the inner side of the hexagonal head 6, and the sealing ring 8 is placed in the groove 9; the metal flange sealing bolt 4 is rotated into the embedded bolt sleeve 3, and one end of the screw rod 7 is threadedly connected to the embedded bolt sleeve 3. The sealing performance between the hexagonal head 6 and the blade root flange body 1 is enhanced through the sealing ring 8, which can effectively avoid pressure relief when the equipment is abnormal, add a line of defense, and further improve the stability of the device seal; there is no need to wrap the flange sealing strip, which can save labor costs and effectively prevent air leakage and air intake during the resin injection process of the blade root; and use a double-layer vacuum bag film to wrap the blade root flange body 1, and the vacuum pump is connected to the double-layer vacuum bag film through a pipeline. The vacuum pump is started and then tightened and sealed, which largely avoids the occurrence of air leakage and pressure relief.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A blade root metal flange end face vacuum sealing device, comprising a blade root flange body (1), an embedded bolt hole (2) arranged on the blade root flange body (1), an embedded bolt sleeve (3) arranged in the embedded bolt hole (2), and a metal flange sealing bolt (4) arranged in the embedded bolt sleeve (3); characterized in that: The metal flange sealing bolt (4) comprises a bolt rod (5), a hexagonal head (6), a screw rod (7), and a sealing ring (8); the hexagonal head (6) is arranged at one end of the bolt rod (5), and the screw rod (7) is arranged at the other end of the bolt rod (5); the bolt rod (5), the hexagonal head (6), and the screw rod (7) are integrally formed; a groove (9) is formed inside the hexagonal head (6) on a side facing the screw rod (7); the sealing ring (8) is arranged in the groove (9), and the inner wall of the sealing ring (8) is in contact with the outer wall of the bolt rod (5).

2. The blade root metal flange end face vacuum sealing device according to claim 1, characterized in that: A hollow cavity (10) is provided inside the interlayer of the sealing ring (8).

3. The blade root metal flange end face vacuum sealing device according to claim 1, characterized in that: A groove (9) protrudes from one side of the sealing ring (8).

4. The blade root metal flange end face vacuum sealing device according to claim 1, characterized in that: It also comprises a bracket (11), wherein the bracket (11) is a U-shaped structure, and the blade root flange body (1) is vertically arranged in the bracket (11).

5. The blade root metal flange end face vacuum sealing device according to claim 4, characterized in that: Reinforcing ribs (12) are obliquely arranged on both sides of the interior of the bracket (11).

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