Anti-corrosion and anti-scouring combined bolt and mounting structure

Abstract

The utility model discloses a kind of rust-proof scouring combined bolt and mounting structure, including connecting rod and protective cap, the connecting rod includes polygonal seat, and the opposite ends of polygonal seat are respectively fixed with first screw rod and second screw rod, the protective cap includes cap body, and cap body one end is provided with accommodating cavity, and the bottom of accommodating cavity is provided with threaded blind hole, and the outer wall of cap body is provided with screwing structure;Under use state, second screw rod is screwed with threaded blind hole, and polygonal seat is located in accommodating cavity.This utility model connects and fixes first flange and second flange by connecting rod, then installs protective cap on the second screw rod of connecting rod, protects connecting rod by protective cap, to prolong the service life of connecting rod.

Description

Technical Field

[0001] This utility model relates to the field of hydro-generator installation technology, and in particular to a rust-resistant and erosion-resistant combined bolt and its installation structure. Background Technology

[0002] In the structure of hydroelectric generator sets, some bolts are constantly submerged in river water, making them difficult to inspect under normal circumstances. These bolts are prone to detachment due to the continuous abrasion from the river water, especially bolts on rotating parts, which can directly lead to mechanical accidents or flooding of the power plant. In the operating environment of hydroelectric generator sets, some critical bolts, due to structural design or functional requirements, must be submerged in river water for extended periods. The concealed locations and complex underwater environment of these bolts make conventional inspection methods difficult, resulting in their health status remaining largely unseen.

[0003] The main mechanisms by which river water damages bolts are: fluid erosion effect, where high-speed, sediment-laden river water continuously scours the bolt surface, especially near rotating parts of the unit (such as bolts in the runner chamber), where turbulent water flow exacerbates the wear of metal materials, leading to a gradual reduction in the effective engagement length of the threads; and vibration loosening, where hydraulic vibrations during unit operation (especially the tailrace vortex condition) subject the bolts to alternating loads. When the preload drops to a critical value due to corrosion, the bolts will gradually loosen under vibration.

[0004] To address the aforementioned issues, we propose a rust-resistant and erosion-resistant composite bolt to extend its service life. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a rust-proof and erosion-resistant combined bolt and its installation structure, wherein the first flange and the second flange are connected and fixed by a connecting rod, and then a protective cap is installed on the second screw of the connecting rod to protect the connecting rod and extend its service life.

[0006] To achieve the above objectives, this application provides a rust-resistant and erosion-resistant combined bolt, including a connecting rod and a protective cap. The connecting rod includes a polygonal seat, with a first screw and a second screw fixed at opposite ends of the polygonal seat. The protective cap includes a cap body, with a receiving cavity at one end of the cap body. A threaded blind hole is provided at the bottom of the receiving cavity, and a screwing structure is provided on the outer wall of the cap body. In use, the second screw is screwed into the threaded blind hole, and the polygonal seat is located inside the receiving cavity.

[0007] The protective cap has a first sealing ring groove at one end on one side of the receiving cavity, and the first sealing ring is installed in the first sealing ring groove.

[0008] The protective cap has multiple first protrusions arranged in a ring at the bottom of the threaded blind hole.

[0009] The first protrusion has a triangular prism structure, a cone structure, or a hemispherical structure.

[0010] The twisting structure is either a polygonal column structure set on the circumference of the cap body, or a polygonal hole structure set on the other end of the cap body.

[0011] The polygonal seat faces one side of the first screw and has multiple second protrusions arranged around the first screw.

[0012] The second protrusion has a triangular prism structure, a cone structure, or a hemispherical structure.

[0013] The polygonal seat has a second sealing ring groove on the side facing the first screw, and the second sealing ring is installed in the second sealing ring groove.

[0014] The polygonal seat has a boss on the side facing the first screw.

[0015] The installation structure of the anti-rust and anti-erosion combined bolt includes a first flange and a second flange. The first flange is used to fix the inner ring of the impeller, and the second flange is used to fix the outer ring of the conical ring. The first flange is located on the upper side of the second flange. The first flange has multiple threaded holes arranged in a ring on the first flange, and the top of the threaded holes is closed. The second flange has a through hole at the position corresponding to the threaded hole. The first screw of the connecting rod passes through the through hole and is screwed and fixed to the threaded hole. The protective cap is screwed and fixed to the second screw through the threaded blind hole. A third annular groove is provided on the upper side of the second flange and inside the through hole. A third sealing ring is installed in the third annular groove.

[0016] Compared with the prior art, the above-conceptual technical solution conceived in this application has the following beneficial effects: This utility model connects and fixes the first flange and the second flange by means of a connecting rod, and then installs a protective cap on the second screw of the connecting rod. The protective cap protects the connecting rod, preventing river water from washing away the connecting rod. Furthermore, through the multi-seal design, river water is less likely to come into contact with the connecting rod, thus improving the service life of the connecting rod. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 This is a schematic diagram of the utility model in use.

[0019] Figure 2 This is a three-dimensional structural diagram of the connecting rod in this utility model.

[0020] Figure 3 This is a schematic diagram of the main structure of the connecting rod in this utility model.

[0021] Figure 4 This is a cross-sectional structural diagram of the connecting rod in this utility model.

[0022] Figure 5 This is a three-dimensional structural diagram of the protective cap in this utility model.

[0023] Figure 6 This is a three-dimensional structural diagram of the internal structure of the protective cap in this utility model.

[0024] Figure 7 This is a cross-sectional structural diagram of the protective cap in this utility model.

[0025] Figure Labels First flange 1, threaded hole 2, tapered ring 3, rotating wheel 4, second flange 5, through hole 6, L-shaped seat 7, third annular groove 8, third sealing ring 9; Connecting rod 10, polygonal seat 11, boss 12, first screw 13, second screw 14, second sealing ring groove 15, second sealing ring 16, second protrusion 17; Protective cap 20, cap body 21, screwing structure 22, receiving cavity 23, threaded blind hole 24, first protrusion 25, first sealing ring groove 26, first sealing ring 27. Detailed Implementation

[0026] To more clearly illustrate the purpose, technical solution, and beneficial effects of this application, a further detailed description of this application is provided below in conjunction with illustrations and specific embodiments. It should be specifically noted that the specific embodiments described below are only for illustrating the technical content of this application and do not constitute a limitation on the scope of protection of this application.

[0027] Regarding the explanation of terminology: In this application, "and / or" is used to describe the relationship between related objects, covering three possible situations: taking "A and / or B" as an example, it can indicate the situation where only A exists, A and B exist simultaneously, or only B exists; the symbol " / " indicates the "or" relationship between related objects, such as "A / B" which refers to A or B.

[0028] Regarding the description of the embodiments: The terms "exemplary" and "for example" appearing in this application are only used to illustrate the technical solutions through specific examples. It should be particularly emphasized that any implementation method or design scheme marked as "exemplary" or "for example" should not be construed as having an advantage over other solutions. Such expressions are only used to present the technical concepts more intuitively.

[0029] Example 1: See Figure 1-7This embodiment provides a rust-resistant and erosion-resistant combined bolt, including a connecting rod 10 and a protective cap 20. The connecting rod 10 includes a polygonal seat 11, with a first screw 13 and a second screw 14 fixed at opposite ends of the polygonal seat 11. The protective cap 20 includes a cap body 21, with a receiving cavity 23 at one end of the cap body 21. A threaded blind hole 24 is provided at the bottom of the receiving cavity 23, and a screwing structure 22 is provided on the outer wall of the cap body 21. In use, the second screw 14 is screwed into the threaded blind hole 24, and the polygonal seat 11 is located in the receiving cavity 23.

[0030] Combination Figure 1 The first flange 1 and the second flange 5 are connected and fixed by the connecting rod 10. Then, a protective cap 20 is installed on the second screw 14 of the connecting rod 10 to protect the connecting rod 10 and extend its service life.

[0031] See Figure 6 , 7 The protective cap 20 has a first sealing ring groove 26 at one end of the receiving cavity 23, and a first sealing ring 27 is installed in the first sealing ring groove 26. By setting the first sealing ring 27, river water is prevented from entering the interior of the protective cap 20.

[0032] Further, see Figure 6 The protective cap 20 has a plurality of first protrusions 25 arranged in a ring at the bottom of the threaded blind hole 24. By setting the first protrusions 25, when the protective cap 20 is tightened, the first protrusions 25 abut against and embed into the end of the second screw 14, increasing the friction and preventing the protective cap 20 from loosening.

[0033] Specifically, the first protrusion 25 has a triangular prism structure, a cone structure, or a hemispherical structure. In this embodiment, the height of the first protrusion 25 is approximately 0.2 mm.

[0034] See Figure 5 The screwing structure 22 is either a polygonal column structure located on the circumference of the cap body 21, or a polygonal hole structure located at the other end of the cap body 21. In use, the protective cap 20 is rotated by clamping the screwing structure 22 with a wrench.

[0035] Example 2: Based on Example 1, see Figure 2 The polygonal seat 11 faces the first screw 13 and has multiple second protrusions 17 around it. By providing the second protrusions 17, when the connecting rod 10 is tightened, the second protrusions 17 abut against and embed into the second flange 5, increasing the friction and preventing the connecting rod 10 from loosening.

[0036] Specifically, the second protrusion 17 has a triangular prism structure, a cone structure, or a hemispherical structure. In this embodiment, the height of the first protrusion 25 is approximately 0.2 mm.

[0037] See Figure 2 , 4 A second sealing ring groove 15 is provided on the side of the polygonal seat 11 facing the first screw 13, and a second sealing ring 16 is installed in the second sealing ring groove 15. The second sealing ring 16 is located on the outside of the second protrusion 17, and seals the polygonal seat 11 and the second flange 5 through the second sealing ring 16, preventing river water from entering the protective cap 20 through the through hole 6 of the second flange 5, which would cause corrosion inside the protective cap 20.

[0038] See Figure 2 The polygonal seat 11 has a boss 12 on the side facing the first screw 13, and the second sealing ring groove 15 is provided on the boss 12.

[0039] Example 3: See Figure 1 The installation structure adopts a combination bolt with anti-rust and anti-erosion properties, including a first flange 1 and a second flange 5. The first flange 1 is used to be fixed to the inner ring of the runner 4, and the second flange 5 is used to be fixed to the outer ring of the conical ring 3. The inner ring of the conical ring 3 is used to rotate and seal the outer wall of the air supply pipe inside the main shaft of the hydro-generator.

[0040] The first flange 1 is located above the second flange 5. The first flange 1 has multiple threaded holes 2 arranged in a ring. The top of the threaded holes 2 is closed. The second flange 5 has a through hole 6 at the position corresponding to the threaded hole 2. The first screw 13 of the connecting rod 10 passes through the through hole 6 and is screwed and fixed to the threaded hole 2. The protective cap 20 is screwed and fixed to the second screw 14 through the threaded blind hole 24. The second flange 5 has a third annular groove 8 on the upper side and inside the through hole 6. A third sealing ring 9 is installed in the third annular groove 8.

[0041] Further, see Figure 1 The second flange 5 is also welded with an L-shaped connector 7, which is also welded to the outer wall of the protective cap 20.

[0042] In this embodiment, the top of the threaded hole 2 can be sealed by welding a sealing plate to the top of the threaded hole 2; or the threaded hole 2 can be set as a threaded blind hole.

[0043] The working principle or process of this utility model: See Figure 1 The first flange 1 is used to be fixedly connected to the inner ring of the runner 4. The second flange 5 is used to be fixedly connected to the outer ring of the conical ring 3, and the inner ring of the conical ring 3 is used to be rotated and sealed to the outer wall of the air supply pipe inside the main shaft of the hydro-generator.

[0044] The first flange 1 is located above the second flange 5. Multiple threaded holes 2 are arranged in a ring on the first flange 1, with the tops of the threaded holes 2 closed. The second flange 5 has through holes 6 corresponding to the threaded holes 2. The first screw 13 of the connecting rod 10 passes through the through hole 6 and is screwed into the threaded hole 2 for fixation. The protective cap 20 is screwed onto the second screw 14 through the threaded blind hole 24. A third annular groove 8 is provided on the upper side of the second flange 5, inside the through hole 6, and a third sealing ring 9 is installed in the third annular groove 8. The upper side of the second flange 5 is located outside the through hole 6, and sealant can be applied during installation for sealing. Alternatively, a sealing ring groove can be provided on the upper side of the second flange 5 outside the through hole 6, and a sealing ring can be installed in the sealing ring groove.

[0045] The protective cap 20 protects the connecting rod 10, preventing river water from washing away the connecting rod 10. Furthermore, the multi-seal design makes it difficult for river water to come into contact with the connecting rod 10, thus improving the service life of the connecting rod 10.

[0046] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A rust-resistant and erosion-resistant composite bolt, characterized in that: The device includes a connecting rod (10) and a protective cap (20). The connecting rod (10) includes a polygonal seat (11). A first screw (13) and a second screw (14) are fixed at opposite ends of the polygonal seat (11). The protective cap (20) includes a cap body (21). A receiving cavity (23) is provided at one end of the cap body (21). A threaded blind hole (24) is provided at the bottom of the receiving cavity (23). A screwing structure (22) is provided on the outer wall of the cap body (21). In use, the second screw (14) is screwed into the threaded blind hole (24), and the polygonal seat (11) is located in the receiving cavity (23).

2. The anti-rust and anti-erosion combined bolt according to claim 1, characterized in that: The protective cap (20) is provided with a first sealing ring groove (26) at the end located on one side of the receiving cavity (23), and the first sealing ring (27) is installed in the first sealing ring groove (26).

3. A rust-resistant and erosion-resistant combined bolt according to claim 1 or 2, characterized in that: The protective cap (20) has a plurality of first protrusions (25) arranged in a ring at the bottom of the threaded blind hole (24).

4. The anti-rust and anti-erosion combined bolt according to claim 3, characterized in that: The first protrusion (25) has a triangular prism structure, a cone structure, or a hemispherical structure.

5. The anti-rust and anti-erosion combined bolt according to claim 1, characterized in that: The twisting structure (22) is a polygonal column structure set on the circumferential surface of the cap body (21), or a polygonal hole structure set on the other end of the cap body (21).

6. The anti-rust and anti-erosion combined bolt according to claim 1, characterized in that: The polygonal seat (11) faces the first screw (13) and is provided with a plurality of second protrusions (17) around the first screw (13).

7. The anti-rust and anti-erosion combined bolt according to claim 6, characterized in that: The second protrusion (17) has a triangular prism structure, a cone structure, or a hemispherical structure.

8. A rust-resistant and erosion-resistant combined bolt according to claim 1 or 6, characterized in that: The polygonal seat (11) has a second sealing ring groove (15) on the side facing the first screw (13), and the second sealing ring (16) is installed in the second sealing ring groove (15).

9. The anti-rust and anti-erosion combined bolt according to claim 8, characterized in that: The polygonal seat (11) has a boss (12) on the side facing the first screw (13).

10. An installation structure for a rust-resistant and erosion-resistant combined bolt as described in claim 1, comprising a first flange (1) and a second flange (5), wherein the first flange (1) is used for fixed connection with the inner ring of the impeller (4), and the second flange (5) is used for fixed connection with the outer ring of the conical ring (3), characterized in that: The first flange (1) is located on the upper side of the second flange (5). The first flange (1) is provided with a plurality of threaded holes (2) arranged in a ring. The top of the threaded holes (2) is closed. The second flange (5) is provided with a through hole (6) at the position corresponding to the threaded hole (2). The first screw (13) of the connecting rod (10) passes through the through hole (6) and is screwed and fixed to the threaded hole (2). The protective cap (20) is screwed and fixed to the second screw (14) through the threaded blind hole (24). A third annular groove (8) is provided on the upper side of the second flange (5) and inside the through hole (6), and a third sealing ring (9) is installed in the third annular groove (8).

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