Oil retainer ring assembly for steam turbine
By adopting a split-type installation ring structure and a multi-seal design, the problem of high manufacturing cost of turbine oil baffle ring components has been solved, achieving cost reduction and improved sealing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-07
- Publication Date
- 2026-03-03
AI Technical Summary
The existing turbine oil baffle ring assembly has high manufacturing costs, and the processing method leads to material waste.
The system adopts a split mounting ring structure, including a main mounting ring and a secondary mounting ring, which are connected by bolts to form an oil storage chamber. It is also equipped with an annular oil baffle, an oil receiving groove, and multiple sealing rings to avoid machining and reduce material waste.
It reduces manufacturing costs, improves sealing performance, prevents oil leakage, and features compact components that are easy to assemble.
Smart Images
Figure CN223964510U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of steam turbine technology, and specifically refers to an oil baffle ring assembly for steam turbines. Background Technology
[0002] In megawatt-scale thermal power plants, electricity is typically generated by megawatt-scale units. Steam turbines are the main equipment in modern thermal power plants and are also used in the metallurgical industry, chemical industry, and ship propulsion systems. When using steam turbines, oil baffles are required to prevent lubricating oil leakage and to prevent foreign objects from entering the bearings and contaminating the lubricating oil.
[0003] Currently, a double-cavity oil baffle ring structure is disclosed on the Chinese patent website [Application No.: CN202110877480X], including an oil baffle ring, a rotor, an oil baffle plate, and a mounting ring. The oil baffle ring, oil baffle plate, and mounting ring are all annular structures. The rotor passes through the annular inner holes of the oil baffle ring, oil baffle plate, and mounting ring. The rotor is a cylindrical structure, divided into three directly connected parts on one side of the bearing housing: a small-diameter part, an annular boss part, and a large-diameter part. The annular boss part is composed of an inwardly inclined annular boss part and an outwardly inclined annular boss part. The inner ring edge of the inwardly inclined annular boss part is directly connected to the small-diameter part, the outer ring edge of the inwardly inclined annular boss part is directly connected to the inner ring edge of the outwardly inclined annular boss part, and the outer ring edge of the outwardly inclined annular boss part is directly connected to the large-diameter part. The oil baffle ring... It has a ring structure, and its inner ring wall is divided into four directly connected parts, namely, an inwardly inclined ring wall, a vertical ring wall, an outwardly inclined ring wall, and a straight ring wall. The inwardly inclined ring wall is loosely connected to the inwardly inclined ring platform. The vertical ring wall is close to the junction of the inwardly inclined ring platform and the outwardly inclined ring platform. The outwardly inclined ring wall is provided with several oil sealing teeth and is close to the outwardly inclined ring platform. The straight ring wall is provided with several oil sealing teeth and is close to the large diameter part. The oil baffle is located inside the oil baffle ring. The inner ring edge of the oil baffle is close to the small diameter part. The oil baffle and the oil baffle ring are tightly connected by the mounting ring. The oil baffle, the mounting ring, the oil baffle ring and the rotor together form an oil collecting cavity. The mounting ring is provided with an annular oil storage cavity, which includes a flared inlet, an oil mist chamber, an oil collection eaves and an oil receiving groove.
[0004] The aforementioned double-cavity oil retaining ring structure has the following features: the mounting ring is an integral structure made of metal, and it contains an oil storage cavity, which includes a flared inlet, an oil mist chamber, an oil collection eave, and an oil receiving groove. The machining method for this mounting ring involves clamping the solid mounting ring onto a machine tool and machining the flared inlet, oil mist chamber, oil collection eave, and oil receiving groove on the mounting ring. The cut parts result in material waste, and this machining method also makes the machining cost of the mounting ring high, thus leading to a high manufacturing cost for the mounting ring. Utility Model Content
[0005] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing an oil baffle ring assembly for steam turbines. The technical problem to be solved by this utility model is: how to solve the problem of high manufacturing cost of oil baffle ring assemblies.
[0006] The objective of this utility model can be achieved through the following technical solutions:
[0007] An oil baffle ring assembly for a steam turbine includes a mounting ring. The mounting ring comprises a main mounting ring and a secondary mounting ring. The secondary mounting ring has an annular boss protruding towards the main mounting ring. One side wall of the secondary mounting ring is fitted against the end face of the annular boss. A sealing ring is provided between one side wall of the main mounting ring and the end face of the annular boss. The secondary mounting ring and the main mounting ring are connected by bolts, which pass through the annular boss. Several bolts are arranged at intervals along the circumference of the secondary mounting ring. An oil storage cavity is formed between the secondary mounting ring and the main mounting ring. An annular oil baffle extending into the oil storage cavity and inclined on the inner side wall of the secondary mounting ring has its outer end facing the annular boss. An oil-receiving groove is formed on the inner wall of the main mounting ring, opposite the annular oil baffle. Sealing rings are provided on the inner circumferential surfaces of both the main mounting ring and the secondary mounting ring.
[0008] After assembly, two sealing rings are fitted onto the outer circumference of the rotating shaft. The sealing ring on the main mounting ring blocks the oil outside the main mounting ring. When some oil enters the area between the main mounting ring and the secondary mounting ring, the sealing ring on the secondary mounting ring blocks the oil within the area between the main mounting ring and the secondary mounting ring, preventing further leakage. The mounting ring in this structure consists of a main mounting ring and a secondary mounting ring. After the main mounting ring and the secondary mounting ring are connected, they form an oil storage cavity. The annular oil baffle and oil groove facilitate oil storage. After the mounting ring is divided into two parts, the main mounting ring and the secondary mounting ring can be cast separately. After the main mounting ring and the secondary mounting ring are cast and demolded, they do not need to be placed on a machine tool for cutting, avoiding material waste and reducing manufacturing costs. The sealing rings seal the contact surfaces between the main mounting ring and the secondary mounting ring, preventing oil leakage from the contact surfaces.
[0009] In the aforementioned turbine oil baffle ring assembly, a return oil hole is provided on the inner bottom surface of the oil storage chamber, through which the main ring is installed. The return oil hole is inclined. The arrangement of the return oil hole allows the oil in the oil storage chamber to flow back to the bearing housing. The inclined arrangement of the return oil hole also prevents oil from splashing out of the bearing housing and thus preventing it from entering the bearing housing through the return oil hole.
[0010] In the aforementioned turbine oil baffle ring assembly, the first sealing ring is located inside the bolt, and a second sealing ring is provided between one side wall of the main mounting ring and the end face of the annular boss, located outside the bolt. The second sealing ring acts as a second seal, further improving the sealing effect on the mating surfaces between the main mounting ring and the secondary mounting ring.
[0011] In the aforementioned turbine oil baffle ring assembly, the outer edge of the main mounting ring has an annular extension extending toward the secondary mounting ring. The secondary mounting ring is disposed within the annular extension, and a sealing ring three is provided between the outer circumferential surface of the secondary mounting ring and the inner circumferential surface of the annular extension. During installation, the secondary mounting ring is first placed into the annular extension, and then moved along the annular extension toward the main mounting ring until the secondary mounting ring and the main mounting ring are in contact. Simultaneously, the annular extension provides a customizable sealing position; that is, the sealing ring three acts as a third seal, further improving the sealing effect after the secondary mounting ring and the main mounting ring are assembled.
[0012] In the aforementioned turbine oil baffle ring assembly, an oil baffle ring is embedded within the annular extension, and the outer circumferential surface of the oil baffle ring engages with the inner circumferential surface of the annular extension. After assembly, the oil baffle ring is also fitted onto the rotating shaft. The annular extension also facilitates the installation of the oil baffle ring, making the oil baffle ring, mounting secondary ring, and mounting main ring form a single component. This results in a compact overall size, low manufacturing cost, and easy assembly of the oil baffle ring assembly.
[0013] In the aforementioned turbine oil baffle ring assembly, the sealing ring has a front sealing lip and a rear sealing lip, which are arranged in a figure-eight shape. Each sealing ring has two seals, improving the sealing effect.
[0014] Compared with the prior art, the turbine oil baffle ring assembly of this utility model has the following advantages: After the mounting ring of this structure is divided into two parts, the main mounting ring and the auxiliary mounting ring can be cast separately. After the main mounting ring and the auxiliary mounting ring are demolded, they do not need to be placed on a machine tool for cutting and processing, which avoids material waste and reduces manufacturing costs. The sealing rings seal the mating surfaces between the main mounting ring and the auxiliary mounting ring, preventing oil leakage from the mating surfaces. Attached Figure Description
[0015] Figure 1 This is a cross-sectional structural diagram of the present invention.
[0016] Figure 2 yes Figure 1 A magnified structural diagram of part A in the middle.
[0017] In the diagram, 1. Mounting ring; 2. Main mounting ring; 20. Annular boss; 21. Oil groove; 22. Annular extension; 3. Secondary mounting ring; 30. Annular oil baffle; 4. Sealing ring one; 5. Bolt; 6. Oil reservoir; 7. Sealing ring; 70. Front sealing lip; 71. Rear sealing lip; 8. Oil return hole; 9. Sealing ring two; 10. Sealing ring three; 11. Oil baffle ring. Detailed Implementation
[0018] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0019] like Figure 1 and Figure 2 As shown, the oil baffle ring assembly for this steam turbine includes a mounting ring 1. The mounting ring 1 includes a main mounting ring 2 and a secondary mounting ring 3. The main mounting ring 2 has an annular boss 20 protruding towards the secondary mounting ring 3. One side wall of the secondary mounting ring 3 is fitted against the end face of the annular boss 20, and a sealing ring 4 is provided between the side wall of the main mounting ring 2 and the end face of the annular boss 20. The secondary mounting ring 3 and the main mounting ring 2 are connected by bolts 5. The bolts 5 pass through the annular boss 20, and there are several bolts 5. All bolts 5 are spaced apart along the circumference of the secondary mounting ring 3. An oil storage cavity 6 is formed between the mounting sub-ring 3 and the mounting main ring 2. The inner wall of the mounting sub-ring 3 has an annular oil baffle 30 that extends into the oil storage cavity 6 and is inclined. The outer end of the annular oil baffle 30 faces the direction of the annular boss 20. An oil receiving groove 21 is provided on the inner wall of the mounting main ring 2. The oil receiving groove 21 is located opposite the annular oil baffle 30. A sealing ring 7 is provided on the inner circumferential surface of the mounting main ring 2 and the inner circumferential surface of the mounting sub-ring 3. The sealing ring 7 has a front sealing lip 70 and a rear sealing lip 71. The front sealing lip 70 and the rear sealing lip 71 are arranged in a figure-eight shape. After assembly, two sealing rings 7 are fitted onto the outer circumference of the rotating shaft. The sealing ring 7 on the main mounting ring 2 blocks the oil outside the main mounting ring 2. When some oil enters the area between the main mounting ring 2 and the secondary mounting ring 3, the sealing ring 7 on the secondary mounting ring 3 blocks the oil within the area between the main mounting ring 2 and the secondary mounting ring 3, preventing further leakage. The mounting ring 1 of this structure consists of the main mounting ring 2 and the secondary mounting ring 3. After the main mounting ring 2 and the secondary mounting ring 3 are connected, they form an oil storage cavity 6. The annular oil baffle 30 and the oil receiving groove 21 are designed to store oil. After the mounting ring 1 is divided into two parts, the main mounting ring 2 and the secondary mounting ring 3 can be cast separately. After the main mounting ring 2 and the secondary mounting ring 3 are cast and demolded, they do not need to be placed on a machine tool for cutting, avoiding material waste and reducing manufacturing costs. The sealing ring 4 seals the mating surface between the main mounting ring 2 and the secondary mounting ring 3, preventing oil leakage from the mating surface.
[0020] like Figure 1 and Figure 2As shown, an oil return hole 8 is provided on the inner bottom surface of the oil storage chamber 6, through which the main ring 2 is installed. The oil return hole 8 is inclined. The setting of the oil return hole 8 allows the oil in the oil storage chamber 6 to flow back to the bearing housing from the oil return hole 8. The inclined setting of the oil return hole 8 also prevents the oil in the bearing housing from splashing up and entering the bearing housing from the oil return hole 8.
[0021] like Figure 1 and Figure 2 As shown, sealing ring 4 is located inside bolt 5. Sealing ring 9 is provided between one side wall of mounting main ring 2 and the end face of annular boss 20, and sealing ring 9 is located outside bolt 5. The outer edge of mounting main ring 2 has an annular extension 22 extending towards mounting secondary ring 3. Mounting secondary ring 3 is disposed within annular extension 22. Sealing ring 10 is provided between the outer circumferential surface of mounting secondary ring 3 and the inner circumferential surface of annular extension 22. The arrangement of sealing rings 2 and 9 and sealing ring 10 forms the second and third seals.
[0022] like Figure 1 and Figure 2 As shown, an oil baffle ring 11 is embedded in the annular extension 22, and the outer circumferential surface of the oil baffle ring 11 is engaged with the inner circumferential surface of the annular extension 22. After assembly, the oil baffle ring 11 is also fitted onto the rotating shaft. The annular extension 22 also facilitates the installation of the oil baffle ring 11, making the oil baffle ring 11, the mounting sub-ring 3, and the mounting main ring 2 form a single component, resulting in a compact overall size, low manufacturing cost, and easy assembly of the oil baffle ring assembly.
[0023] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.
Claims
1. An oil baffle ring assembly for a steam turbine, comprising a mounting ring (1), characterized in that, The mounting ring (1) includes a main mounting ring (2) and a secondary mounting ring (3). The main mounting ring (2) has an annular boss (20) protruding towards the secondary mounting ring (3). One side wall of the secondary mounting ring (3) fits against the end face of the annular boss (20), and a sealing ring (4) is provided between one side wall of the main mounting ring (2) and the end face of the annular boss (20). The secondary mounting ring (3) and the main mounting ring (2) are connected by bolts (5). The bolts (5) pass through the annular boss (20), and there are several bolts (5). The mounting sub-ring (3) is spaced circumferentially; an oil storage cavity (6) is formed between the mounting sub-ring (3) and the mounting main ring (2); the inner wall of the mounting sub-ring (3) has an annular oil baffle (30) that extends into the oil storage cavity (6) and is inclined; the outer end of the annular oil baffle (30) faces the annular boss (20); an oil receiving groove (21) is provided on the inner wall of the mounting main ring (2); the oil receiving groove (21) is located opposite the annular oil baffle (30); and sealing rings (7) are provided on the inner circumferential surface of the mounting main ring (2) and the inner circumferential surface of the mounting sub-ring (3).
2. The oil baffle ring assembly for a steam turbine according to claim 1, characterized in that, The inner bottom surface of the oil storage cavity (6) is provided with an oil return hole (8) that penetrates the main ring (2) and is inclined.
3. The oil baffle ring assembly for a steam turbine according to claim 1, characterized in that, The first sealing ring (4) is located inside the bolt (5), and a second sealing ring (9) is provided between one side wall of the mounting main ring (2) and the end face of the annular boss (20). The second sealing ring (9) is located outside the bolt (5).
4. A turbine oil baffle ring assembly according to claim 1 or 3, characterized in that, The outer edge of the mounting main ring (2) has an annular extension (22) extending toward the mounting sub-ring (3). The mounting sub-ring (3) is disposed inside the annular extension (22). A sealing ring three (10) is provided between the outer peripheral surface of the mounting sub-ring (3) and the inner peripheral surface of the annular extension (22).
5. The oil baffle ring assembly for a steam turbine according to claim 4, characterized in that, An oil baffle ring (11) is embedded in the annular extension (22), and the outer peripheral surface of the oil baffle ring (11) is engaged with the inner peripheral surface of the annular extension (22).
6. The oil baffle ring assembly for a steam turbine according to claim 1, characterized in that, The sealing ring (7) has a front sealing lip (70) and a rear sealing lip (71), which are arranged in a figure-eight shape.