An anti-seepage bolt installation structure for the transformer oil tank of an offshore platform wind power generation

Abstract

The present invention relates to an anti-seepage bolt installation structure for a wind power transformer oil tank of an offshore platform. A bolt is inserted into a screw hole. Installation end holes are provided at both ends of the screw hole. A first anti-seepage washer is provided between the nut of the bolt and the installation end hole at the corresponding end of the screw hole. A nut is installed at the free end of the bolt, and a second anti-seepage washer is provided between the nut and the installation end hole at the corresponding end of the screw hole. The installation end hole is provided with an inclined side surface and a bottom hole surface, and the bottom hole surface is provided with an embedding groove. The outer surfaces of the first anti-seepage washer and the second anti-seepage washer are both inclined surfaces that abut against the inclined side surfaces of the corresponding installation end holes. The bottom surfaces of the first anti-seepage washer and the second anti-seepage washer are both provided with protrusions that cooperate with the embedding grooves of the corresponding installation end holes. An elastic sealing ring is provided outside the second anti-seepage washer. The present invention solves the problem that the bolt is easily loosened under the long-term vibration effect, resulting in oil leakage, and can also avoid the problem of bolt fracture caused by loosening.

Description

Technical Field

[0001] The present invention relates to the field of transformers, and more particularly to an anti-seepage bolt installation structure for a transformer oil tank of an offshore platform wind power generation. Background Art

[0002] With the progress of China's economic strength, the demand for electricity has been increasing day by day, and power equipment has also developed rapidly. At present, many power equipment has reached the international leading level. Under the environment of increasing demand in the engineering field, the construction of power generation facilities has gradually developed from land to the sea. Due to the change of the working environment, new transformer equipment has also been updated. However, in the process of updating, there are still new problems. For example, due to the complex environment of the offshore platform, it is affected by loads such as reciprocating impact loads and wind loads of seawater, and the platform will generate unstable vibrations. Under the vibration excitation of the transformer oil tank of the power generation equipment, there will be oil leakage and other phenomena in parts such as bolt holes. Therefore, correcting its anti-seepage measures plays an important role in the use and safety of the overall equipment. Summary of the Invention

[0003] The purpose of the present invention is to provide an anti-seepage bolt installation structure for a transformer oil tank of an offshore platform wind power generation, in which a pre-tightening force is generated under the extrusion state of the first anti-seepage gasket and the second anti-seepage gasket, solving the problem that bolts are easily loosened under long-term vibration, resulting in oil leakage, and also avoiding the problem of bolt fracture caused by loosening.

[0004] The purpose of the present invention is achieved by the following technical solutions:[[]]END]]

[0005] An anti-seepage bolt installation structure for a transformer oil tank of an offshore platform wind power generation, including a bolt, a nut, a first anti-seepage gasket and a second anti-seepage gasket. The bolt is inserted into a screw hole provided at the installation position. Both ends of the screw hole are provided with installation end holes. A first anti-seepage gasket is provided between the nut of the bolt and the installation end hole at the corresponding end of the screw hole. The nut is installed at the free end of the bolt, and a second anti-seepage gasket is provided between the nut and the installation end hole at the corresponding end of the screw hole. The installation end hole is provided with an inclined side surface and a bottom hole surface, and the bottom hole surface is provided with an embedded groove. The outer surfaces of the first anti-seepage gasket and the second anti-seepage gasket are both inclined surfaces and are in contact with the inclined side surfaces of the corresponding installation end holes. The bottom surfaces of the first anti-seepage gasket and the second anti-seepage gasket are both provided with protrusions that cooperate with the embedded grooves of the corresponding installation end holes. An elastic sealing ring is provided outside the second anti-seepage gasket.

[0006] The first anti-seepage gasket includes a first gasket flange and a first gasket protrusion provided in the middle of the first gasket flange. The outer circumferential surface of the first gasket protrusion forms a first gasket inclined surface. The end surface of the first gasket protrusion forms a first gasket inner end surface, and a first protrusion is provided on the first gasket inner end surface.

[0007] During installation, the first gasket flange is disposed between the nut of the bolt and the upper surface of the installation position and is pressed by the nut. The first gasket inclined surface abuts against the inclined side surface of the corresponding installation end hole, and the inner end surface of the first gasket abuts against the bottom hole surface of the corresponding installation end hole. Moreover, the first protrusion is embedded in the embedding groove of the corresponding installation end hole.

[0008] The second anti-seepage gasket includes a second gasket flange and a second gasket protrusion portion provided in the middle of the second gasket flange. The outer circumferential surface of the second gasket protrusion portion forms a second gasket inclined surface, and the end surface of the second gasket protrusion portion forms a second gasket inner end surface. Moreover, a second protrusion is provided on the second gasket inner end surface, and an elastic sealing ring is provided on the outer edge of the side of the second gasket flange away from the second gasket protrusion portion.

[0009] During installation, the second gasket flange is disposed between the nut and the lower surface of the installation position and is pressed by the nut. The second gasket inclined surface abuts against the inclined side surface of the corresponding installation end hole, and the second gasket inner end surface abuts against the bottom hole surface of the corresponding installation end hole. Moreover, the second protrusion is embedded in the embedding groove of the corresponding installation end hole.

[0010] The elastic sealing ring has elastic deformation ability, and the elastic deformation distance of the elastic sealing ring is greater than the allowable loosening distance of the bolt and the nut.

[0011] The first anti-seepage gasket and the second anti-seepage gasket are made of a polymer damping rubber material.

[0012] The advantages and positive effects of the present invention are as follows:

[0013] 1. Both the first anti-seepage gasket and the second anti-seepage gasket of the present invention are provided with gasket protrusion portions, and the outer circumferential surface of the gasket protrusion portion forms a gasket inclined surface that generates a pre-tightening force when pressed against the inclined side surface of the installation end hole corresponding to the screw hole. Thus, the problem that the bolt is likely to loosen under the action of long-term vibration, resulting in oil leakage, is solved, and the problem of bolt fracture caused by loosening can also be avoided.

[0014] 2. The first gasket flange of the first anti-seepage gasket of the present invention is pressed and sealed by the nut of the bolt and the upper surface of the installation position, and the second gasket flange of the second anti-seepage gasket is pressed and sealed by the nut and the lower surface of the installation position. Moreover, the gasket inclined surface outside the gasket protrusion portion of each anti-seepage gasket is pressed against the inclined side surface of the corresponding installation end hole to form a seal. At the same time, a protrusion is provided on the inner end surface of each anti-seepage gasket, which is embedded and engaged with the embedding groove of the bottom hole surface of the corresponding installation end hole to form a seal, thereby ensuring the sealing performance.

[0015] 3. An elastic sealing ring with a certain elastic deformation distance is provided on the outer side of the second anti-seepage gasket of the present invention, and the elastic distance of the elastic sealing ring is greater than the allowable loosening distance of the bolt and nut. In this way, even if the bolt and nut become loose, it can ensure their close contact. Additionally, even if a small amount of oil leakage occurs, it can be blocked in the second anti-seepage gasket. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a structural sectional view of the present invention,

[0017] Figure 2 is Figure 1 a top view of the screw hole for installing the bolt in

[0018] Figure 3 is a three-dimensional schematic Figure 1 ,

[0019] Figure 4 is a three-dimensional schematic Figure 2 .

[0020] Among them, 1 is the bolt, 2 is the first anti-seepage gasket, 201 is the first gasket flange, 202 is the first gasket inclined surface, 203 is the inner end surface of the first gasket, 204 is the first protrusion, 3 is the second anti-seepage gasket, 301 is the second gasket flange, 302 is the second gasket inclined surface, 303 is the inner end surface of the second gasket, 304 is the second protrusion, 305 is the elastic sealing ring, 4 is the nut, 5 is the nut, 6 is the screw hole, 601 is the installation end hole, 602 is the embedding groove, 603 is the inclined side surface, and 604 is the bottom hole surface. DETAILED DESCRIPTION OF THE INVENTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings.

[0022] As Figures 1 to 4 shown, the present invention includes a bolt 1, a nut 5, a first anti-seepage gasket 2, and a second anti-seepage gasket 3. The bolt 1 is inserted into a screw hole 6 provided at the installation position. Both ends of the screw hole 6 are provided with installation end holes 601. And as Figure 1 shown, a first anti-seepage gasket 2 is provided between the nut 4 of the bolt 1 and the installation end hole 601 at the corresponding end of the screw hole 6. The nut 5 is installed at the free end of the bolt 1, and a second anti-seepage gasket 3 is provided between the nut 5 and the installation end hole 601 at the corresponding end of the screw hole 6. As Figure 2 shown, the installation end hole 601 is provided with an inclined side surface 603 and a bottom hole surface 604, and the bottom hole surface 604 is provided with an embedding groove 602. As Figure 1As shown, the outer surfaces of the first anti-seepage washer 2 and the second anti-seepage washer 3 are both inclined surfaces that abut against the inclined side surfaces 603 of the corresponding mounting end holes 601. The bottom surfaces of the first anti-seepage washer 2 and the second anti-seepage washer 3 are both provided with protrusions that cooperate with the embedding grooves 602 of the corresponding mounting end holes 601. An elastic sealing ring 305 is provided on the outer side of the second anti-seepage washer 3.

[0023] As Figure 1 and Figures 3 to 4 shown, the first anti-seepage washer 2 includes a first washer flange 201 and a first washer protrusion provided in the middle of the first washer flange 201. The outer circumferential surface of the first washer protrusion forms a first washer inclined surface 202, and the end surface of the first washer protrusion forms a first washer inner end surface 203 and is provided with a first protrusion 204. During installation, the first washer flange 201 is disposed between the nut 4 of the bolt 1 and the upper surface of the installation position and is pressed by the nut 4. The first washer inclined surface 202 abuts tightly against the inclined side surface 603 of the corresponding mounting end hole 601. The first washer inner end surface 203 abuts tightly against the bottom hole surface 604 of the corresponding mounting end hole 601, and the first protrusion 204 is embedded in the embedding groove 602 of the corresponding mounting end hole 601.

[0024] As Figure 1 and Figures 3 to 4 shown, the second anti-seepage washer 3 includes a second washer flange 301 and a second washer protrusion provided in the middle of the second washer flange 301. The outer circumferential surface of the second washer protrusion forms a second washer inclined surface 302, and the end surface of the second washer protrusion forms a second washer inner end surface 303 and is provided with a second protrusion 304. An elastic sealing ring 305 is provided on the outer edge of the second washer flange 301 on the side away from the second washer protrusion. During installation, the second washer flange 301 is disposed between the nut 5 and the lower surface of the installation position and is pressed by the nut 5. The second washer inclined surface 302 abuts tightly against the inclined side surface 603 of the corresponding mounting end hole 601. The second washer inner end surface 303 abuts tightly against the bottom hole surface 604 of the corresponding mounting end hole 601, and the second protrusion 304 is embedded in the embedding groove 602 of the corresponding mounting end hole 601.

[0025] In this embodiment, the first anti-seepage washer 2 and the second anti-seepage washer 3 can be made of a water-stop washer made of a polymer shock-absorbing rubber material, and the polymer shock-absorbing rubber material is a well-known technology in the art. In addition, the elastic sealing ring 5 of the second anti-seepage washer 3 is an omega-shaped washer, and this embodiment is made of a polymer rubber wrapped with an elastic metal sheet.

[0026] The working principle of the present invention is:

[0027] During the installation of the present invention, the bolt 1 is inserted into the screw hole 6 at the installation position, and the first washer protrusion of the first anti-seepage washer 2 and the second washer protrusion of the second anti-seepage washer 3 are respectively placed in the installation end hole 601 at the corresponding end of the screw hole 6. During the process of tightening the bolt 1, first, the first washer flange 201 is tightly sealed by the combined action of the nut 4 and the upper surface of the installation position. The second washer flange 301 is tightly sealed by the combined action of the nut 5 and the lower surface of the installation external (the surface on the inner side of the transformer oil tank). Secondly, the wedge-shaped first washer protrusion and the second washer protrusion are squeezed into the corresponding installation end hole 601, so that the first washer inclined surface 202 and the second washer inclined surface 302 are respectively pressed tightly against the inclined side surface 603 of the corresponding installation end hole 601 to generate a pre-tightening force, and a layer of sealing and leakage prevention is formed inside the installation end hole 601. Thirdly, the first protrusion 204 of the first anti-seepage washer 2 and the second protrusion 304 of the second anti-seepage washer 3 are embedded and squeezed with the embedding groove 602 of the corresponding installation end hole 601 to form another layer of sealing and leakage prevention, thereby ensuring the sealing performance. The loosening of the bolt 1 on the offshore platform is mostly caused by high-frequency vibration. The first washer protrusion and the second washer protrusion are made of high molecular damping rubber, which can reduce the influence of high-frequency vibration. Moreover, the elastic sealing ring 305 of the second anti-seepage washer 3 has the ability of elastic deformation and can achieve a certain elastic deformation distance through the action of oil pressure. And the elastic deformation distance is greater than the allowable loosening distance between the bolt 1 and the nut 5. In this way, even if the nut 5 and the bolt 1 become loose, their close contact can be ensured. In addition, even if there is a small amount of oil leakage, it can be blocked in the second anti-seepage washer 3.

[0028] The first anti-seepage washer and the second anti-seepage washer of the present invention generate a pre-tightening force in the extrusion state, thus solving the problem that the bolt 1 is easily loosened under the long-term vibration effect, which may lead to oil leakage, and can also avoid the problem of the bolt 1 breaking caused by loosening. During the design calculation, the calculation of the pre-tightening force load affecting the bolt loosening is carried out according to two conditions: the pre-tightening working condition and the working condition. In the pre-tightening working condition, the bolt tension should be equal to the minimum pressing load required to press the first anti-seepage washer 2 and the second anti-seepage washer 3. In the working condition, the bolt load should be equal to the sum of the axial load generated by resisting the internal pressure of the oil tank and the pressing load necessary to maintain the surface seal of the first anti-seepage washer 2 and the second anti-seepage washer 3. The above calculations are well-known technologies in the art. In addition, the present invention conducts a vibration experiment on the threaded fasteners by simulating the marine environment to obtain the possible loosening distance, and designs the elastic deformation distance of the elastic sealing ring 305 based on this, making it greater than the allowable loosening distance. In this way, even if the bolt 1 and the nut 5 become loose, the elastic sealing ring 305 can still ensure the close contact between the bolt 1 and the nut 5 under the action of the internal pressure of the oil tank.

Claims

1. An installation structure of an anti-seepage bolt for a transformer oil tank of an offshore platform wind power generation, characterized in that: It includes a bolt (1), a nut (5), a first anti-seepage washer (2) and a second anti-seepage washer (3). The bolt (1) is inserted into a threaded hole (6) provided at the installation position. Both ends of the threaded hole (6) are provided with installation end holes (601). A first anti-seepage washer (2) is provided between the nut (4) of the bolt (1) and the installation end hole (601) at the corresponding end of the threaded hole (6). The nut (5) is installed at the free end of the bolt (1), and a second anti-seepage washer (3) is provided between the nut (5) and the installation end hole (601) at the corresponding end of the threaded hole (6). The installation end hole (601) is provided with an inclined side surface (603) and a bottom hole surface (604), and the bottom hole surface (604) is provided with an embedded groove (602). The outer surfaces of the first anti-seepage washer (2) and the second anti-seepage washer (3) are both inclined surfaces that abut against the inclined side surface (603) of the corresponding installation end hole (601). The bottom surfaces of the first anti-seepage washer (2) and the second anti-seepage washer (3) are both provided with protrusions that cooperate with the embedded grooves (602) of the corresponding installation end holes (601). An elastic sealing ring (305) is provided on the outer side of the second anti-seepage washer (3); The first anti-seepage washer (2) includes a first washer flange (201) and a first washer protrusion provided in the middle of the first washer flange (201). The outer circumferential surface of the first washer protrusion forms a first washer inclined surface (202). The end surface of the first washer protrusion forms a first washer inner end surface (203), and the first washer inner end surface (203) is provided with a first protrusion (204); The second anti-seepage washer (3) includes a second washer flange (301) and a second washer protrusion provided in the middle of the second washer flange (301). The outer circumferential surface of the second washer protrusion forms a second washer inclined surface (302). The end surface of the second washer protrusion forms a second washer inner end surface (303), and the second washer inner end surface (303) is provided with a second protrusion (304). An elastic sealing ring (305) is provided on the outer edge of the side of the second washer flange (301) away from the second washer protrusion; The elastic sealing ring (305) has elastic deformation ability, and the elastic deformation distance of the elastic sealing ring (305) is greater than the allowable loosening distance of the bolt (1) and the nut (5); The first anti-seepage washer (2) and the second anti-seepage washer (3) are made of high molecular shock-absorbing rubber material, and the elastic sealing ring (305) is made of high molecular rubber wrapped with elastic metal sheets.

2. The anti-seepage bolt installation structure of the transformer oil tank for offshore platform wind power generation according to claim 1, wherein: During installation, the first washer flange (201) is provided between the nut (4) of the bolt (1) and the upper surface of the installation position and is pressed by the nut (4). The first washer inclined surface (202) abuts tightly against the inclined side surface (603) of the corresponding installation end hole (601). The first washer inner end surface (203) abuts tightly against the bottom hole surface (604) of the corresponding installation end hole (601), and the first protrusion (204) is embedded in the embedded groove (602) of the corresponding installation end hole (601).

3. The anti-seepage bolt installation structure of the transformer oil tank for wind power generation on an offshore platform according to claim 1, wherein: During installation, the second washer flange (301) is disposed between the nut (5) and the lower surface of the installation position and is pressed by the nut (5). The second washer inclined surface (302) abuts against and closely adheres to the inclined side surface (603) of the corresponding installation end hole (601). The inner end surface (303) of the second washer abuts against and closely adheres to the bottom hole surface (604) of the corresponding installation end hole (601). Moreover, the second protrusion (304) is embedded in the embedding groove (602) of the corresponding installation end hole (601).

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