Oil baffle device for steam turbine

Abstract

The utility model discloses an oil retaining device for a steam turbine, which relates to the technical field of oil retaining devices and comprises an outer ring and a fixing ring, a first mounting groove is arranged at the bottom of the outer ring, a second mounting groove is arranged at the top in the first mounting groove, a fitting ring is arranged in the second mounting groove, and a gasket is arranged at the lower end of the fitting ring. The attaching ring and the gasket are fixedly mounted in the second mounting groove through the fixing ring, a plurality of screw grooves are formed in the top in the first mounting groove, and two first sealing grooves are formed in the top in the second mounting groove. A fitting ring is arranged at the bottom of an outer ring, a pressed ring is fixedly mounted on the outer side of the fitting ring, the fitting ring and the pressed ring are fixedly mounted in a second mounting groove through a gasket and a fixing ring, and the fitting ring can be always kept in an expansion state by means of the acting force of a fixing seat, so that the fitting ring is matched with the outer ring to improve the sealing performance of the outer ring and a shaft or a bearing; and the condition of oil leakage caused by operation abrasion or reduction of the viscosity of lubricating oil in the later period is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of oil retaining devices, in particular to an oil retaining device for a steam turbine. Background Art

[0002] The oil retainer ring used in steam turbine is a key component in the steam turbine system. Its main function is to control and prevent the loss of oil to ensure that the shaft maintains its stability and reliability.

[0003] The oil retaining ring usually includes an inner ring and an outer ring. The inner ring has a relatively small diameter and is used to control the oil film thickness to ensure that the bearings of the steam turbine are fully lubricated and avoid premature wear of the bearings due to too thin an oil film. The outer ring has a relatively large diameter and its main function is to prevent the oil from being lost during the operation of the steam turbine and to ensure the normal operation of the oil circulation system, thereby ensuring the stability and safety of the steam turbine. For example, the Chinese utility model patent disclosed in the publication number CN211008778U: An oil retaining device for a steam turbine, wherein a protective edge is provided in the middle of both sides of the baffle body, through which the width of the baffle body can be increased. The width can increase the protection effect, and a fixing ring is clamped on the outside of the shaft sleeve, and a widened oil deflector is installed on the outside of the fixing ring through fixed teeth. The widened oil deflector can improve the oil deflection effect and increase the sealing performance. However, since the widened oil deflector needs to be tightly connected with the bearing or the outside of the shaft, and the oil deflector is installed inside the shaft or the outside of the bearing to follow the shaft or bearing to rotate, because with the rotation of the shaft, wear may occur between the oil deflector and the shaft or bearing, resulting in an increase in the gap. In addition, the oxidation and contamination of the lubricating oil in a high temperature and high pressure environment will also reduce its viscosity, making it easier for the lubricating oil to flow out of the gap. Utility Model Content

[0004] The utility model aims to provide an oil retaining device for a steam turbine, which can effectively solve the problems in the background technology.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] An oil retaining device for a steam turbine comprises an outer ring and a fixed ring, wherein a first mounting groove is provided at the bottom of the outer ring, a second mounting groove is provided at the top of the first mounting groove, a fitting ring is provided in the second mounting groove, a gasket is provided at the lower end of the fitting ring, and the fitting ring and the gasket are fixedly installed in the second mounting groove via a fixed ring.

[0007] As a further preferred embodiment of the present invention, a plurality of screw grooves are provided in the top of the first installation groove, two first sealing grooves are provided in the top of the second installation groove, the first sealing groove is annular in structure, and a plurality of positioning grooves are provided in the top of the second installation groove located between the two first sealing grooves.

[0008] As a further preferred embodiment of the present invention, a pressure ring is fixedly installed on the outside of the fitting ring, both of which are made of rubber, and the inside of the fitting ring and the pressure ring are hollow structures. With the arrangement of the fitting ring, the connection sealing between the outer ring and the rotating shaft can be improved.

[0009] As a further preferred embodiment of the present invention, two sealing rings are fixedly installed on the top of the pressure ring, a plurality of positioning columns are fixedly installed on the pressure ring located between the two sealing rings, a sealing flange is fixedly installed on the bottom of the pressure ring, the fitting ring and the pressure ring are inserted and installed in the second installation groove, the two sealing rings are inserted and installed in the corresponding first sealing grooves, and the positioning columns are inserted and installed in the corresponding positioning grooves.

[0010] As a further preferred embodiment of the present invention, a second sealing groove is provided on the top of the gasket, a plurality of fixing seats are fixedly installed on the bottom of the gasket, a retaining ring is fixedly installed on the bottom of the fixing seat, a compression spring is clamped on the fixing seat, and the top of the gasket is installed on the sealing flange at the bottom of the pressure ring through the second sealing groove. By setting the sealing flange and the second sealing groove, the sealing between the outer ring, the fixing ring, the fitting ring and the gasket can be further improved, and a plurality of compression springs can apply pressure to the pressure ring to ensure that the gas in the pressure ring can supplement the gas in the fitting ring, thereby ensuring the structural integrity of the fitting ring.

[0011] As a further preferred embodiment of the present invention, a plurality of mounting countersunk holes are provided in the fixing ring, a supporting groove is fixedly installed on the inner side of the fixing ring, screws are inserted into the mounting countersunk holes and the fixing ring is fixedly installed in the first mounting groove, and the supporting groove is placed at the bottom of a plurality of compression springs. Through the arrangement of the fixing ring and the supporting groove, the fitting ring and the gasket can be fixedly installed in the second mounting groove.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The utility model discloses an oil retaining device for a steam turbine, wherein a fitting ring is arranged at the bottom of an outer ring, and a pressure ring is fixedly installed on the outside of the fitting ring. The fitting ring and the pressure ring are fixedly installed in a second installation groove through a gasket and a fixing ring, and the fitting ring can always maintain an expanded state by means of the force of the fixing seat, thereby cooperating with the outer ring to improve the sealing performance between the outer ring and the shaft or bearing, and preventing oil leakage due to wear during operation or reduced viscosity of the lubricating oil in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the main structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the main structure of the utility model;

[0016] Figure 3 It is a bottom view of the outer ring, fitting ring and gasket structure of the utility model;

[0017] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0018] Figure 5 It is a cross-sectional view of the main structure of the utility model.

[0019] In the figure: 1. outer ring; 2. fixing ring; 3. fitting ring; 4. gasket; 5. first mounting groove; 6. second mounting groove; 7. screw groove; 8. positioning groove; 9. first sealing groove; 10. pressure ring; 11. sealing ring; 12. positioning column; 13. sealing flange; 14. second sealing groove; 15. fixing seat; 16. retaining ring; 17. compression spring; 18. supporting groove; 19. mounting countersunk hole. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0021] like Figure 1-Figure 5 As shown, the utility model provides an oil retaining device for a steam turbine, comprising an outer ring 1 and a fixed ring 2, a first mounting groove 5 is provided at the bottom of the outer ring 1, a second mounting groove 6 is provided at the top of the first mounting groove 5, a fitting ring 3 is provided in the second mounting groove 6, a gasket 4 is provided at the lower end of the fitting ring 3, and the fitting ring 3 and the gasket 4 are fixedly installed in the second mounting groove 6 through the fixed ring 2.

[0022] like Figure 3 As shown, a plurality of screw grooves 7 are provided in the top of the first installation groove 5, two first sealing grooves 9 are provided in the top of the second installation groove 6, the first sealing grooves 9 are annular, and a plurality of positioning grooves 8 are provided in the top of the second installation groove 6 between the two first sealing grooves 9;

[0023] like Figure 2-Figure 3 As shown, a pressure ring 10 is fixedly installed on the outside of the fitting ring 3, and both the fitting ring 3 and the pressure ring 10 are made of rubber material, and the fitting ring 3 and the pressure ring 10 are hollow structures. With the arrangement of the fitting ring 3, the connection sealing between the outer ring 1 and the rotating shaft can be improved, and two sealing rings 11 are fixedly installed on the top of the pressure ring 10, and a plurality of positioning columns 12 are fixedly installed on the pressure ring 10 located between the two sealing rings 11, and a sealing flange 13 is fixedly installed on the bottom of the pressure ring 10, and the fitting ring 3 and the pressure ring 10 are inserted and installed in the second installation groove 6, and the two sealing rings 11 are inserted and installed in the corresponding first sealing groove 9, and the positioning columns 12 are inserted and installed in the corresponding positioning groove 8;

[0024] like Figure 2-Figure 5 As shown, a second sealing groove 14 is provided at the top of the gasket 4, a plurality of fixing seats 15 are fixedly installed at the bottom of the gasket 4, a clamping ring 16 is fixedly installed at the bottom of the fixing seat 15, and a compression spring 17 is clamped on the fixing seat 15. The top of the gasket 4 is inserted and installed on the sealing flange 13 at the bottom of the pressure ring 10 through the second sealing groove 14. The sealing performance between the outer ring 1, the fixing ring 2, the fitting ring 3 and the gasket 4 can be further improved by setting the sealing flange 13 and the second sealing groove 14. In addition, the plurality of compression springs 17 can clamp the pressure ring 10 applies pressure to ensure that the gas in the pressure ring 10 can supplement the gas in the fitting ring 3 to ensure the structural integrity of the fitting ring 3. A plurality of mounting countersunk holes 19 are opened in the fixing ring 2, and a supporting groove 18 is fixedly installed on the inner side of the fixing ring 2. Screws are inserted into the mounting countersunk holes 19 and the fixing ring 2 is fixedly installed in the first mounting groove 5. The supporting groove 18 is placed at the bottom of a plurality of compression springs 17. Through the setting of the fixing ring 2 and the supporting groove 18, the fitting ring 3 and the gasket 4 can be fixedly installed in the second mounting groove 6.

[0025] It should be noted that the utility model is an oil retaining device for a steam turbine. Before assembling the overall structure, the outer ring 1 is first heated and installed on the outside of the bearing or the shaft. After the outer ring 1 is cooled, the inner side of the outer ring 1 can fit tightly against the outside of the bearing or the shaft due to the principle of thermal expansion and contraction. Then the fitting ring 3 and the pressure ring 10 are installed in the second installation groove 6, and the inner wall of the fitting ring 3 is aligned with the inner wall of the outer ring 1. At the same time, the two sealing rings 11 on the top of the pressure ring 10 are installed in the corresponding first sealing grooves 9 respectively, and the top of the positioning column 12 is installed in the corresponding positioning groove 8. With the arrangement of the first sealing groove 9 and the sealing ring 11, the sealing between the fitting ring 3, the pressure ring 10 and the outer ring 1 can be improved. Subsequently, the gasket 4 is installed on the sealing flange 13 at the bottom of the pressure ring 10 through the second sealing groove 14 at the bottom, and then the fixing ring 2 can be fixed in the first installation groove 5 by screws, and the supporting groove 18 compresses the multiple compression springs 17 at the bottom of the gasket 4, so that after the compression spring 17 is compressed, the reaction force is used to pressurize the gasket 4, thereby applying pressure to the pressure ring 10 through the gasket 4, so that the gas in the pressure ring 10 can always compensate for the inside of the fitting ring 3, thereby ensuring the expansion of the fitting ring 3, and then the inner side of the fitting ring 3 can be tightly fitted to the outer side of the bearing or the shaft.

[0026] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. An oil retaining device for a steam turbine, characterized in that: The invention comprises an outer ring (1) and a fixing ring (2), wherein a first mounting groove (5) is provided at the bottom of the outer ring (1), a second mounting groove (6) is provided at the top of the first mounting groove (5), a fitting ring (3) is provided in the second mounting groove (6), a gasket (4) is provided at the lower end of the fitting ring (3), and the fitting ring (3) and the gasket (4) are fixedly installed in the second mounting groove (6) via the fixing ring (2).

2. The oil retaining device for a steam turbine according to claim 1, characterized in that: A plurality of screw grooves (7) are provided at the top of the first installation groove (5), two first sealing grooves (9) are provided at the top of the second installation groove (6), the first sealing groove (9) is an annular structure, and a plurality of positioning grooves (8) are provided at the top of the second installation groove (6) located between the two first sealing grooves (9).

3. The oil retaining device for a steam turbine according to claim 2, characterized in that: A pressure ring (10) is fixedly mounted on the outside of the fitting ring (3); the fitting ring (3) and the pressure ring (10) are both made of rubber material, and the fitting ring (3) and the pressure ring (10) are hollow in structure.

4. The oil retaining device for a steam turbine according to claim 3, characterized in that: Two sealing rings (11) are fixedly mounted on the top of the pressure ring (10), a plurality of positioning columns (12) are fixedly mounted on the pressure ring (10) located between the two sealing rings (11), a sealing flange (13) is fixedly mounted on the bottom of the pressure ring (10), the fitting ring (3) and the pressure ring (10) are inserted and mounted in the second mounting groove (6), the two sealing rings (11) are inserted and mounted in the corresponding first sealing grooves (9), and the positioning columns (12) are inserted and mounted in the corresponding positioning grooves (8).

5. The oil retaining device for a steam turbine according to claim 4, characterized in that: The top of the gasket (4) is provided with a second sealing groove (14); the bottom of the gasket (4) is fixedly provided with a plurality of fixing seats (15); the bottom of the fixing seats (15) is fixedly provided with a clamping ring (16); a compression spring (17) is clamped on the fixing seats (15); the top of the gasket (4) is inserted through the second sealing groove (14) and installed on the sealing flange (13) at the bottom of the pressure ring (10).

6. The oil retaining device for a steam turbine according to claim 2, characterized in that: A plurality of mounting countersunk holes (19) are provided in the fixing ring (2), a supporting groove (18) is fixedly installed on the inner side of the fixing ring (2), screws are inserted into the mounting countersunk holes (19) and the fixing ring (2) is fixedly installed in the first mounting groove (5), and the supporting groove (18) is placed at the bottom of a plurality of compression springs (17).

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