Small gas turbine bearing structure and pulling device and pulling method of thrust disc of small gas turbine bearing structure

Abstract

The invention discloses a small gas turbine bearing structure and a pulling device and pulling method of a thrust disc of the small gas turbine bearing structure, the bearing structure comprises a front bearing outer bush, a center rotating shaft, an auxiliary thrust bearing, the thrust disc, a main thrust bearing and a front radial bearing, and a pulling groove is formed in the end of the thrust disc; a clamping part corresponding to the pulling groove is arranged in the inner clamping sleeve assembly and used for being connected with the pulling groove in a clamped mode, and pulling separation of the thrust disc is achieved. A bearing structure form capable of being used for the small gas turbine is designed, a corresponding pulling device is provided for the thrust disc of the structure form, the bearing structure and the pulling device can be used for the small gas turbine compact in structure, and effective use of the bearing and stable installation and pulling work of the thrust disc can be achieved. Through the combination of a series of tools, the thrust disc can be taken out from the central rotating shaft only by rotating the threaded jackscrew through a wrench.

Description

Technical Field

[0001] The invention belongs to the field of machinery, and in particular relates to a small-sized combustion engine bearing structure and a pulling device for a thrust plate thereof. Background Art

[0002] Small gas turbines are compact in size, and the inner diameter of the front and rear bearings is generally only tens of millimeters. However, the thrust of the engine can reach several thousand Newtons to tens of thousands of Newtons. Therefore, small gas turbines need to be designed with thrust bearings. In a small space, thrust bearings, thrust plates, radial bearings and other parts need to be included. The thrust plate is generally simple in design but still needs to be fixed. The overall design, design and disassembly of the thrust plate are all difficult problems.

[0003] CN118682442A belongs to the field of gas turbine technology, specifically relating to a disassembly and assembly device for disassembling and assembling gas turbine bearings. This device allows for quick disassembly and repair of bearings, significantly reducing maintenance time and costs, minimizing impact on production, and effectively extending the stable operation of the gas turbine. However, this invention is designed for industrial-grade or heavy-duty gas turbines, whose thrust plates can be configured with various complex structures for disassembly. This design is unsuitable for thrust plates designed for small gas turbines, and the disassembly tooling is also unsuitable for small gas turbines, which have complex structures. Furthermore, small gas turbines are compact and small, and their integrated front bearing structure can be disassembled in a vertical position, which does not match the structural design of this invention.

[0004] The CN222293406U solution provides a special tool for reinstalling the thrust plate cover of a PDH gas turbine, which relates to the field of chemical equipment and solves the technical problem that the thrust plate of a gas turbine requires manual handling and pushing for installation, which is difficult and labor-intensive. The solution focuses on the installation problem of a heavy thrust plate, which is installed horizontally and is a thrust plate of an industrial gas turbine. It is large in size and does not conform to the application scenario of a small gas turbine.

[0005] Therefore, it is of great practical significance to design a bearing structure for a small gas turbine and a corresponding pulling device for its thrust plate. Summary of the Invention

[0006] In response to the above-mentioned problems, in order to solve the above-mentioned problems, the present invention proposes a bearing structure that can be used in a small gas turbine, and provides a corresponding extraction device for the thrust plate of this structure. The bearing structure and extraction device can be used in a small gas turbine with a compact structure, and can achieve effective use of the bearing and stable installation and extraction of the thrust plate.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: The camshaft is an axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially axially

[0008] Furthermore, a first clamping block is provided between the thrust plate body and the main thrust bearing and the auxiliary thrust bearing respectively, and a second clamping block is provided on a side of the main thrust bearing away from the thrust plate body.

[0009] Furthermore, a first clamping platform and a second clamping platform are provided on the inner side of the outer bushing of the front bearing, the end of the first clamping block is clamped with the first clamping platform, and the end of the front radial bearing is clamped with the second clamping platform.

[0010] Furthermore, a pulling groove is provided on the outer side of the end portion of the thrust plate sleeve for cooperating with the pulling device to separate the thrust plate from the central rotating shaft.

[0011] Furthermore, an oil retaining ring and dynamic and static sealing grate teeth are provided at the right end of the central rotating shaft to prevent lubricating oil from entering the interior of the combustion engine.

[0012] The present invention also proposes a pulling device for the thrust plate of the above-mentioned small gas engine bearing structure, including an inner clamping sleeve assembly, a gasket, a threaded push rod and an outer shell. The inner clamping sleeve assembly includes a first inner clamping sleeve and a second inner clamping sleeve. The first inner clamping sleeve and the second inner clamping sleeve are clamped together to form a cylindrical clamping sleeve structure, which is used to be sleeved on the outside of the end of the thrust plate sleeve. A clamping portion corresponding to the pulling groove is provided inside the first inner clamping sleeve and the second inner clamping sleeve, which is used to clamp with the pulling groove to realize the pulling and separation of the thrust plate. The first inner clamping sleeve and the second inner clamping sleeve are fixed by the inner clamping sleeve fixing screws.

[0013] Furthermore, the threaded push rod is divided into an externally threaded section and a non-externally threaded section, the outer diameter of the externally threaded section is larger than the outer diameter of the non-externally threaded section, and a step surface is provided at the contact point between the externally threaded section and the non-externally threaded section; the center of the internal slot assembly has an internally threaded hole corresponding to the externally threaded section of the threaded push rod, the pad is arranged inside the cylindrical cavity of the central rotating shaft, and the threaded push rod passes through the internally threaded hole of the internal slot assembly to extend into the cylindrical cavity and cooperate with the pad.

[0014] Furthermore, the pad is a cylindrical structure, and a trumpet-shaped opening is provided at one end of the pad; the end of the external thread section of the threaded push rod has a conical structure, and the top of the conical structure contacts the center of the trumpet opening of the pad.

[0015] Furthermore, the outer shell and the outer sleeve of the front bearing are fixed by an outer shell fixing screw. The end of the outer shell has a through hole that matches the outer diameter of the non-external threaded section of the threaded push rod. The non-external threaded section of the threaded push rod is arranged to pass through the through hole of the outer shell, and a wrench operating joint is provided at the end of the non-external threaded section to facilitate the rotation of the threaded push rod by a wrench.

[0016] Furthermore, an adjusting gasket is provided between the pad and the bottom of the cylindrical cavity of the central shaft; the internal depth of the outer shell is recorded as L5, the distance from the side plane of the inner ferrule assembly to the side plane of the outer bushing of the front bearing is recorded as L3, the distance between the step surface at the contact point between the external threaded section and the non-external threaded section on the threaded push rod and the side plane of the inner ferrule assembly is recorded as L4, and the thickness of the adjusting gasket satisfies L4=L5-L3; the depth L5 of the outer shell is greater than the total length of the thrust plate sleeve.

[0017] The method for extracting the thrust plate extraction device includes the following processes: First, remove the secondary thrust bearing on the outside of the thrust plate, place the gasket and adjustment gasket in the cylindrical cavity of the center shaft, then align the first inner ferrule and the second inner ferrule and install them on the thrust plate sleeve so that the clamping part is matched with the pulling groove, and then use the inner ferrule fixing screw to fix it, turn the threaded push rod into the internal threaded hole of the inner ferrule assembly until it hits the gasket, then install the outer shell to the outermost side, and fix it to the front bearing outer sleeve with the outer shell fixing screw. The non-external threaded section of the threaded push rod passes through the through hole on the outer shell, so that the step surface of the threaded push rod is clamped on the inner wall of the outer shell, and finally the thrust plate can be removed from the center shaft by rotating the threaded push rod with a wrench.

[0018] In summary, the present invention designs a bearing structure that can be used in small gas turbines, and provides a corresponding extraction device for the thrust plate of this structure. This bearing structure and extraction device can be used in compact small gas turbines, achieving effective use of the bearing, stable installation of the thrust plate, and extraction. On the one hand, the thrust plate's reasonable interference fit design ensures that the thrust plate is fixed to the central shaft in accordance with the bearing's use requirements and can also meet the extraction requirements. On the other hand, the simple and efficient extraction of the thrust plate can complete the extraction of the thrust plate of a small gas turbine through the combination of simple tooling, with good centering and simple and efficient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the bearing structure of the present invention; Figure 2 This is a schematic diagram of the thrust plate design requirements of the present invention; Figure 3 It is a schematic diagram of the pulling device of the present invention; Figure 4 This is a schematic structural diagram of the inner ferrule assembly of the present invention; Figure 5 This is a schematic diagram of the outer shell of the present invention; Figure 6 Schematic diagram of the outer bushing structure of the front bearing of the present invention (cross-sectional view); In the figure: 1. Front bearing outer sleeve; 101. First clamping table; 102. Second clamping table; 2. Central rotating shaft; 201. Cylindrical cavity; 3. Secondary thrust bearing; 4. Thrust plate; 401. Thrust plate body; 402. Thrust plate sleeve; 5. Main thrust bearing; 6. Front radial bearing; 7. Comb teeth for dynamic and static seals; 8. First inner clamping sleeve; 9. Second inner clamping sleeve; 10. Spacer; 11. Threaded push rod; 1101. Wrench-operated joint; 12. Outer shell; 13. Outer shell fixing screw; 14. Adjusting gasket; 15. Inner sleeve fixing screw; 16. First clamping block; 17. Second clamping block; 18. Extraction groove; 19. Oil retaining ring. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0021] like Figure 1 and Figure 2 As shown, the small gas turbine bearing structure in the present invention includes a front bearing outer sleeve 1, a central rotating shaft 2, a secondary thrust bearing 3, a thrust plate 4, a main thrust bearing 5 and a front radial bearing 6. The thrust plate 4 includes a thrust plate body 401 and a thrust plate sleeve 402. The thrust plate sleeve 402 is sleeved on the outer surface of the central rotating shaft 2. The secondary thrust bearing 3 and the main thrust bearing 5 are sleeved on the thrust plate sleeve 402 and are respectively located on both sides of the thrust plate body 401. A front radial bearing 6 is also provided on the side of the main thrust bearing 5 away from the thrust plate body 401. The front radial bearing 6 is sleeved on the outside of the thrust plate sleeve 402. The front bearing outer sleeve 1 is sleeved on the outside of the secondary thrust bearing 3, the thrust plate body 401, the main thrust bearing 5 and the front radial bearing 6 arranged in sequence and clamped. The front bearing outer sleeve 1 of the present invention is fixedly arranged and fixedly connected to external equipment.

[0022] A suitable gland can be designed on the outside of the secondary thrust bearing 3 as needed. By controlling the clearance between the installed gland and the secondary thrust bearing 3, the clearance between the thrust plate 4 and the left and right thrust bearings is controlled to meet the thrust bearing's operating requirements. An oil retainer ring 19 and dynamic and static sealing grate teeth 7 are installed at the right end of the central shaft 2 to effectively prevent lubricating oil from entering the engine.

[0023] A first clamping block 16 is provided between the thrust plate body 401 and the main thrust bearing 5 and the auxiliary thrust bearing 3 , respectively. A second clamping block 17 is further provided on a side of the main thrust bearing 5 away from the thrust plate body 401 .

[0024] like Figure 6 As shown, a first clamping platform 101 and a second clamping platform 102 are provided on the inner side of the front bearing outer bushing 1 , the end of the first clamping block 16 is clamped with the first clamping platform 101 , and the end of the front radial bearing 6 is clamped with the second clamping platform 102 .

[0025] The thrust plate 4 and the central shaft 2 are designed with interference, and the interference surface is Figure 2 In the L1 and L2 sections, the front end of the thrust plate 4 is designed with a pull-out groove 18, such as Figure 2 As shown in A, it can be used to install the first inner ferrule 8 and the second inner ferrule 9. The selection of the interference surface width and the interference amount must comply with certain design principles. The total interference friction force must be less than half of the maximum tensile stress when the extraction groove 18 is broken, retaining a certain safety margin.

[0026] The lifting device of the thrust plate is as follows Figure 3 As shown, it includes an inner ferrule assembly, a spacer 10, a threaded push rod 11 and an outer shell 12. The inner ferrule assembly includes a first inner ferrule 8 and a second inner ferrule 9. The first inner ferrule 8 and the second inner ferrule 9 are clamped together to form a cylindrical ferrule structure for being sleeved on the outside of the end of the thrust disk sleeve 402. A clamping portion corresponding to the extraction groove 18 is provided inside the first inner ferrule 8 and the second inner ferrule 9 for clamping with the extraction groove 18 to realize the pulling and separation of the thrust disk 4. The first inner ferrule 8 and the second inner ferrule 9 are fixed by the inner ferrule fixing screws 15. From Figure 4 It can be seen that the first inner ferrule 8 and the second inner ferrule 9 are actually different structures, which are plugged into each other to form a cylindrical ferrule structure.

[0027] The threaded push rod 11 described in the present invention is divided into an external thread section and a non-external thread section. The outer diameter of the external thread section is larger than the outer diameter of the non-external thread section, and a step surface is provided at the contact point between the external thread section and the non-external thread section; the center of the inner slot assembly has an internal threaded hole corresponding to the external thread section of the threaded push rod 11, and the pad 10 is arranged inside the cylindrical cavity 201 of the central rotating shaft 2. The threaded push rod 11 passes through the internal threaded hole of the inner slot assembly and is used to extend into the cylindrical cavity 201 and cooperate with the pad 10.

[0028] The pad 10 of the present invention is a cylindrical structure, and a trumpet-shaped opening is provided at one end of the pad 10; the end of the external thread section of the threaded push rod 11 has a conical structure, and the top of the conical structure contacts the center of the trumpet opening of the pad 10.

[0029] like Figure 5 As shown, the outer housing 12 is secured to the front bearing outer bushing 1 via an outer housing fixing screw 13. The end of the outer housing 12 has a through hole that matches the outer diameter of the non-externally threaded section of the threaded push rod 11. During assembly, the non-externally threaded section of the threaded push rod 11 is inserted through the through hole of the outer housing 12. A wrench-operated joint 1101 is provided at the end of the non-externally threaded section to facilitate rotation of the threaded push rod 11 using a wrench. An adjustment shim 14 is provided between the spacer 10 and the bottom of the cylindrical cavity 201 of the central shaft 2.

[0030] The method for extracting the thrust plate of the present invention includes the following steps: After removing the secondary thrust bearing 3 on the outer side of the thrust disc 4, it is necessary to use the pulling device to remove the thrust disc 4 that is interference fit on the central shaft 2. First, place the cushion block 10 and the adjusting shim 14 in the cylindrical cavity 201 of the central shaft 2, and then align the first inner ferrule 8 and the second inner ferrule 9 and install them on the thrust disc 4. Figure 4 As shown, use the inner ferrule fixing screw 15 to fix it, turn the threaded push rod 11 into the threaded hole of the first inner ferrule 8 until it hits the pad 10, the depth of the outer shell 12 is recorded as L5, the distance from the side plane of the inner ferrule assembly to the side plane of the front bearing outer bushing 1 is recorded as L3, the distance between the step surface at the contact point between the external thread section and the non-external thread section on the threaded push rod 11 and the side plane of the inner ferrule assembly is recorded as L4, and the thickness of the gasket 14 is adjusted to meet L4=L5-L3; then press Figure 5 Install the outer shell 12 to the outermost position and secure it with the outer shell fixing screws 13. Insert the non-externally threaded section of the threaded push rod 11 through the through-hole in the outer shell 12, so that the stepped surface of the threaded push rod 11 engages the inner wall of the outer shell 12. Finally, use a wrench to rotate the threaded push rod 11 to remove the thrust plate 4 from the central shaft 2. To fully eject the thrust plate, the depth L5 of the outer shell 12 must be greater than the total length of the inner hole of the thrust plate 4.

[0031] In terms of the drawing process principle, the front bearing outer bushing 1 of the present invention is a fixed component, and the outer shell 12 connected to it is also a fixed component. The step surface of the threaded push rod 11 is clamped in the through hole of the outer shell 12. When working, the threaded push rod 11 only rotates by itself and has no displacement movement. Therefore, the inner clamping sleeve assembly matched through the threaded relationship moves to the left under the rotation of the threaded push rod 11, thereby driving the thrust plate 4 to be removed from the center shaft.

[0032] Through the combination of a series of tooling, the thrust plate 4 can be removed from the central shaft 2 by simply rotating the threaded push rod 11 with a wrench. The contact form between the pad 10 and the threaded push rod 11 can achieve automatic centering during operation, and the entire operation process is simple and efficient.

[0033] The thrust plate pulling device of the present invention is usually used for pulling out a thrust plate in a vertical state, but can also be used for pulling out a thrust plate in a horizontal state after the tooling is well aligned with the central rotating shaft.

[0034] The reasonable interference design of the thrust plate of the present invention not only ensures that the thrust plate is fixed to the central rotating shaft in accordance with the bearing use requirements, but also meets the pulling requirements; the simple and efficient thrust plate pulling out can complete the pulling out work of the thrust plate of a small gas turbine through the combination of simple tooling, with good centering and simple and efficient operation.

[0035] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A small gas turbine bearing structure, characterized in that: The invention comprises a front bearing outer sleeve (1), a central rotating shaft (2), a secondary thrust bearing (3), a thrust disc (4), a main thrust bearing (5) and a front radial bearing (6), wherein the thrust disc (4) comprises a thrust disc body (401) and a thrust disc sleeve (402), the thrust disc sleeve (402) is sleeved on the outer surface of the central rotating shaft (2), the thrust disc sleeve (402) and the central rotating shaft (2) are in an interference fit, and the interference surfaces are located at both ends of the contact surface between the thrust disc sleeve (402) and the central rotating shaft (2), the secondary thrust bearing (3) and the main thrust bearing (5) are sleeved A front radial bearing (6) is provided on the thrust disc sleeve (402) and on both sides of the thrust disc body (401). The front radial bearing (6) is sleeved on the outside of the thrust disc sleeve (402). The front bearing outer bushing (1) is sleeved on the outside of the secondary thrust bearing (3), the thrust disc body (401), the main thrust bearing (5), and the front radial bearing (6) which are arranged in sequence and are clamped. A cylindrical cavity (201) is provided on the inner side of the center of the end of the central shaft (2).

2. A small gas turbine bearing structure according to claim 1, characterized in that: A first clamping block (16) is respectively provided between the thrust disc body (401) and the main thrust bearing (5) and the auxiliary thrust bearing (3), and a second clamping block (17) is further provided on the side of the main thrust bearing (5) away from the thrust disc body (401); a first clamping platform (101) and a second clamping platform (102) are provided on the inner side of the front bearing outer bushing (1), the end of the first clamping block (16) is clamped with the first clamping platform (101), and the end of the front radial bearing (6) is clamped with the second clamping platform (102); a pressure cover is provided on the outer side of the auxiliary thrust bearing (3), and the clearance between the thrust disc (4) and the main thrust bearing (5) and the auxiliary thrust bearing (3) is controlled by controlling the gap between the installed pressure cover and the auxiliary thrust bearing (3).

3. A small-sized gas turbine bearing structure according to claim 2, characterized in that: A pulling groove (18) is also provided on the outer side of the end of the thrust disc sleeve (402) for cooperating with the pulling device to separate the thrust disc (4) from the central rotating shaft (2).

4. A small-sized gas turbine bearing structure according to claim 3, characterized in that: An oil retaining ring (19) and dynamic and static sealing grate teeth (7) are provided at the right end of the central rotating shaft (2) to prevent lubricating oil from entering the interior of the combustion engine.

5. The device for extracting the thrust plate of a small combustion engine bearing structure according to claim 3 or 4, characterized in that: The invention comprises an inner ferrule assembly, a spacer (10), a threaded push rod (11) and an outer shell (12), wherein the inner ferrule assembly comprises a first inner ferrule (8) and a second inner ferrule (9), wherein the first inner ferrule (8) and the second inner ferrule (9) are engaged with each other to form a cylindrical ferrule structure, which is used to be sleeved on the outer side of the end of the thrust disk sleeve (402), and a engaging portion corresponding to the pulling groove (18) is provided inside the first inner ferrule (8) and the second inner ferrule (9), which is used to engage with the pulling groove (18) to realize the pulling and separation of the thrust disk (4), and the first inner ferrule (8) and the second inner ferrule (9) are fixed by an inner ferrule fixing screw (15).

6. The device for extracting the thrust plate of a small combustion engine bearing structure according to claim 5, characterized in that: The threaded push rod (11) is divided into an external thread section and a non-external thread section, the external thread section has an outer diameter greater than the outer diameter of the non-external thread section, and a step surface is provided at the contact point between the external thread section and the non-external thread section; the center of the inner slot assembly has an internal threaded hole corresponding to the external thread section of the threaded push rod (11), the pad (10) is arranged inside the cylindrical cavity (201) of the central shaft (2), and the threaded push rod (11) passes through the internal threaded hole of the inner slot assembly and is used to extend into the cylindrical cavity (201) and cooperate with the pad (10).

7. The device for extracting the thrust plate of a small combustion engine bearing structure according to claim 6, characterized in that: The pad (10) is a cylindrical structure, and one end of the pad (10) is provided with a trumpet-shaped opening; the end of the external thread section of the threaded push rod (11) has a conical structure, and the top end of the conical structure contacts the center of the trumpet opening of the pad (10).

8. The device for extracting the thrust plate of a small combustion engine bearing structure according to claim 7, characterized in that: The outer shell (12) and the front bearing outer bushing (1) are fixed by an outer shell fixing screw (13); the end of the outer shell (12) has a through hole that matches the outer diameter of the non-externally threaded section of the threaded push rod (11); the non-externally threaded section of the threaded push rod (11) is arranged to pass through the through hole of the outer shell (12); and the end of the non-externally threaded section is provided with a wrench operating joint (1101) to facilitate the rotation of the threaded push rod (11) by using a wrench.

9. The device for extracting the thrust plate of a small combustion engine bearing structure according to claim 7, characterized in that: An adjusting gasket (14) is provided between the pad (10) and the bottom of the cylindrical cavity (201) of the central shaft (2); the internal depth of the outer shell (12) is recorded as L5, the distance from the side plane of the inner ferrule assembly to the side plane of the front bearing outer bushing (1) is recorded as L3, the distance between the step surface at the contact point between the external threaded section and the non-external threaded section on the threaded push rod (11) and the side plane of the inner ferrule assembly is recorded as L4, and the thickness of the adjusting gasket (14) satisfies L4=L5-L3; the depth L5 of the outer shell (12) is greater than the total length of the thrust plate sleeve (402).

10. The pulling method of the pulling device according to claim 8 or 9, characterized in that: Including the following processes: First, remove the secondary thrust bearing (3) on the outside of the thrust disc (4), place the pad (10) and the adjustment gasket (14) in the cylindrical cavity (201) of the central shaft (2), and then align the first inner sleeve (8) and the second inner sleeve (9) and install them on the thrust disc sleeve (402) so that the clamping part is matched with the extraction groove (18), and then use the inner sleeve fixing screw (15) to fix it, and turn the threaded push rod (11) into the inner sleeve assembly. The outer shell (12) is then installed to the outermost side and fixed to the front bearing outer bushing (1) with the outer shell fixing screws (13). The non-external threaded section of the threaded push rod (11) passes through the through hole on the outer shell (12), so that the step surface of the threaded push rod (11) is clamped on the inner wall of the outer shell (12). Finally, the thrust plate (4) can be removed from the central shaft (2) by rotating the threaded push rod (11) with a wrench.

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