Bearing box suitable for double-support bearing structure for double rotors

Abstract

The invention discloses a bearing box suitable for a double-support bearing structure for double rotors, and relates to the technical field of design of bearing boxes for steam turbines. The bearing box solves the problems that an existing bearing box for the steam turbine adopts a single support bearing structure, is not suitable for a double-rotor structural form and is poor in stability. A first bearing box mounting hole is machined in the rear end of a bearing box body, the first bearing box mounting hole and a first rotor of a steam turbine are coaxially arranged, a second bearing box mounting hole is machined in the front end of the bearing box body, and the second bearing box mounting hole and a second rotor of the steam turbine are coaxially arranged. A first rotor supporting bearing is mounted on the side, close to the first bearing box mounting hole, in the bearing box body, a second rotor supporting bearing is mounted on the side, close to the second bearing box mounting hole, in the bearing box body, and the first rotor supporting bearing and the second rotor supporting bearing are mounted on the first rotor and the second rotor respectively. The method is used for effectively stabilizing the double-rotor state and improving the unit operation efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbine bearing box design, and in particular to a bearing box suitable for a double-support bearing structure for double rotors. Background Art

[0002] In the design of bearing boxes for general steam turbines, the common rotor is a single whole rotor, and the bearing box generally adopts a single support bearing structure. However, for the dual-rotor structure, it is necessary to provide dual bearing support for the first and second rotors respectively to enhance stability. Traditional bearing boxes obviously no longer meet the requirements. Therefore, optimizing the design of the bearing box structure and setting up a dual support bearing seat in a limited space is particularly important for improving stability and unit performance. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that the existing bearing box for steam turbine adopts a single-support bearing structure, is not suitable for a dual-rotor structure, and has poor stability, and further to provide a bearing box with a dual-support bearing structure suitable for a dual-rotor.

[0004] The technical solution of the present invention is:

[0005] A bearing box suitable for a double-support bearing structure for dual rotors, comprising a No. 1 rotor support bearing 3, a bearing box body 5 and a No. 2 rotor support bearing 6. A horizontally arranged first bearing box mounting hole is processed at the rear end of the bearing box body 5, and the first bearing box mounting hole is coaxially arranged with a No. 1 turbine rotor 1. A horizontally arranged second bearing box mounting hole is processed at the front end of the bearing box body 5, and the second bearing box mounting hole is coaxially arranged with a No. 2 turbine rotor 8. A No. 1 rotor support bearing 3 is installed on one side of the bearing box body 5 near the first bearing box mounting hole, and the No. 1 rotor support bearing 3 is installed on the No. 1 turbine rotor 1. A No. 2 rotor support bearing 6 is installed on one side of the bearing box body 5 near the second bearing box mounting hole, and the No. 2 rotor support bearing 6 is installed on the No. 2 turbine rotor 8.

[0006] Furthermore, an integrally formed No. 1 rotor support bearing seat is provided inside the bearing box body 5, and a horizontally arranged first bearing mounting hole is processed on the No. 1 rotor support bearing seat. The No. 1 rotor support bearing 3 is coaxially inserted in the first bearing mounting hole. An interference fit is adopted between the outer ring of the No. 1 rotor support bearing 3 and the first bearing mounting hole of the No. 1 rotor support bearing seat, and an interference fit is adopted between the inner ring of the No. 1 rotor support bearing 3 and the No. 1 rotor 1 of the turbine.

[0007] Furthermore, an integrally formed No. 2 rotor support bearing seat is provided inside the bearing box body 5, and a horizontally arranged second bearing mounting hole is processed on the No. 2 rotor support bearing seat. The No. 2 rotor support bearing 6 is coaxially inserted in the second bearing mounting hole. An interference fit is adopted between the outer ring of the No. 2 rotor support bearing 6 and the second bearing mounting hole of the No. 2 rotor support bearing seat, and an interference fit is adopted between the inner ring of the No. 2 rotor support bearing 6 and the No. 2 rotor 8 of the turbine.

[0008] Furthermore, it also includes a rear oil baffle ring 2 , which is coaxially embedded in the first bearing box mounting hole at the rear end of the bearing box body 5 .

[0009] Furthermore, a rear oil ring mounting groove is processed in the middle of the inner wall of the first bearing box mounting hole, and a rear oil ring mounting protrusion matching the rear oil ring mounting groove is processed on the side wall of the rear oil ring 2, and the rear oil ring mounting protrusion is embedded in the rear oil ring mounting groove.

[0010] Furthermore, it also includes a front oil baffle ring 7 , which is coaxially embedded in the second bearing box mounting hole at the front end of the bearing box body 5 .

[0011] Furthermore, a front oil ring mounting groove is processed in the middle of the inner wall of the second bearing box mounting hole, and a front oil ring mounting protrusion matching the front oil ring mounting groove is processed on the side wall of the front oil ring 7, and the front oil ring mounting protrusion is embedded in the front oil ring mounting groove.

[0012] Furthermore, both the rear oil baffle ring 2 and the front oil baffle ring 7 are variable diameter annular structures formed by a plurality of non-metallic inner sealing blocks in an annular array.

[0013] Furthermore, both the steam turbine rotor No. 1 1 and the steam turbine rotor No. 2 8 are machined with rotor ring grooves matching the variable diameter ring structures of the rear oil retaining ring 2 and the front oil retaining ring 7 .

[0014] Furthermore, lubricating oil holes are processed on the No. 1 rotor support bearing seat and the No. 2 rotor support bearing seat, and the end of the horizontal hole section of the L-shaped lubricating oil hole is a lubricating oil port, and the lubricating oil port is connected with the side surface of the No. 1 rotor support bearing seat and / or the No. 2 rotor support bearing seat, and the vertical hole section of the L-shaped lubricating oil hole is connected with the first bearing mounting hole surface of the No. 1 rotor support bearing seat and / or the second bearing mounting hole surface of the No. 2 rotor support bearing seat.

[0015] Compared with the prior art, the present invention has the following effects:

[0016] The present invention provides a bearing box with double support bearings for double rotors, which improves the stability of the double support bearings. Due to the synergistic effect of the No. 1 rotor support bearing 3 and the No. 2 rotor support bearing 6, the vibration and displacement of the unit during operation are effectively suppressed, thereby improving the stability and reliability of the unit operation. In addition, this design also helps to improve the load-bearing capacity, enabling it to withstand greater loads, while extending the service life of the bearings. The built-in adjustment gear 4 ensures the stable efficiency of the dual rotor operation process; the built-in lubrication system, the double support bearing seats are respectively equipped with lubricating oil ports to maintain the good lubrication state of the bearings and reduce wear and failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a bearing box suitable for a double-support bearing structure for double rotors described in the present invention.

[0018] In the figure: 1. Steam turbine rotor No. 1; 2. Rear oil ring; 3. Rotor No. 1 support bearing; 4. Adjusting gear; 5. Bearing box body; 6. Rotor No. 2 support bearing; 7. Front oil ring; 8. Steam turbine rotor No. 2. DETAILED DESCRIPTION

[0019] Specific implementation method 1: Combination Figure 1 The present embodiment is described. A bearing box of the present embodiment is suitable for a dual-support bearing structure for dual rotors, comprising a No. 1 rotor support bearing 3, a bearing box body 5 and a No. 2 rotor support bearing 6. A first bearing box mounting hole arranged horizontally is processed at the rear end of the bearing box body 5, and the first bearing box mounting hole is coaxially arranged with the No. 1 rotor 1 of the steam turbine. A second bearing box mounting hole arranged horizontally is processed at the front end of the bearing box body 5, and the second bearing box mounting hole is coaxially arranged with the No. 2 rotor 8 of the steam turbine. A No. 1 rotor support bearing 3 is installed on one side of the bearing box body 5 near the first bearing box mounting hole, and the No. 1 rotor support bearing 3 is installed on the No. 1 rotor 1 of the steam turbine. A No. 2 rotor support bearing 6 is installed on one side of the bearing box body 5 near the second bearing box mounting hole, and the No. 2 rotor support bearing 6 is installed on the No. 2 rotor 8 of the steam turbine.

[0020] Specific implementation method 2: Combination Figure 1To explain this embodiment, the bearing box body 5 of this embodiment is provided with an integrally formed No. 1 rotor support bearing seat inside, the No. 1 rotor support bearing seat is processed with a horizontally arranged first bearing mounting hole, the No. 1 rotor support bearing 3 is coaxially inserted in the first bearing mounting hole, the No. 1 rotor support bearing 3 outer ring and the No. 1 rotor support bearing seat first bearing mounting hole are connected by interference fit, and the No. 1 rotor support bearing 3 inner ring and the No. 1 turbine rotor 1 are connected by interference fit. In this way, the No. 1 rotor support bearing seat is arranged on the No. 1 turbine rotor 1, and the No. 1 rotor support bearing seat is arranged in the bearing box body 5 to form an integral structure. Other components and connection relationships are the same as those of the first specific embodiment.

[0021] In this embodiment, an adjusting gear installation position is provided inside the bearing box body 5, and the adjusting gear 4 is used to connect the steam turbine rotor No. 1 1 and the steam turbine rotor No. 2 8 to ensure the operating efficiency.

[0022] Specific implementation method three: Combination Figure 1 To explain this embodiment, the bearing box body 5 of this embodiment is provided with an integrally formed No. 2 rotor support bearing seat inside, the No. 2 rotor support bearing seat is processed with a horizontally arranged second bearing mounting hole, the No. 2 rotor support bearing 6 is coaxially inserted in the second bearing mounting hole, the outer ring of the No. 2 rotor support bearing 6 and the second bearing mounting hole of the No. 2 rotor support bearing seat are connected by interference fit, and the inner ring of the No. 2 rotor support bearing 6 and the No. 2 turbine rotor 8 are connected by interference fit. In this way, the No. 2 rotor support bearing seat is arranged on the No. 2 turbine rotor 8, and the No. 2 rotor support bearing seat is arranged in the bearing box body 5 to form an integral structure. Other components and connection relationships are the same as those of the first or second specific embodiments.

[0023] Specific implementation method four: Combination Figure 1 This embodiment further includes a rear oil baffle ring 2, which is coaxially embedded in the first bearing box mounting hole at the rear end of the bearing box body 5. In this way, the rear end of the bearing box body 5 is provided with a rear oil baffle ring 2 to prevent the lubricating oil from splashing out and impurities from entering the interior of the bearing box body 5, thereby protecting the No. 1 rotor support bearing 3 from contamination. Other components and connection relationships are the same as those of the first, second or third embodiments.

[0024] Specific implementation method five: Combination Figure 1 To explain this embodiment, a rear oil ring mounting groove is processed in the middle of the inner wall of the first bearing box mounting hole of this embodiment, and a rear oil ring mounting protrusion matching the rear oil ring mounting groove is processed on the side wall of the rear oil ring 2, and the rear oil ring mounting protrusion is embedded in the rear oil ring mounting groove. Other components and connection relationships are the same as those of the specific embodiments one, two, three or four.

[0025] Specific implementation method six: Combination Figure 1 This embodiment further includes a front oil baffle ring 7, which is coaxially embedded in the second bearing box mounting hole at the front end of the bearing box body 5. In this way, the front end of the bearing box body 5 is provided with a front oil baffle ring 7 to prevent the lubricating oil from splashing out and impurities from entering the interior of the bearing box body 5, thereby protecting the second rotor support bearing 6 from contamination. Other components and connection relationships are the same as those of the first, second, third, fourth or fifth embodiments.

[0026] Specific implementation method seven: Combination Figure 1 To explain this embodiment, a front oil ring mounting groove is processed in the middle of the inner wall of the second bearing box mounting hole of this embodiment, and a front oil ring mounting protrusion matching the front oil ring mounting groove is processed on the side wall of the front oil ring 7, and the front oil ring mounting protrusion is embedded in the front oil ring mounting groove. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five or six.

[0027] Specific implementation method eight: Combination Figure 1 To explain this embodiment, the rear oil retainer ring 2 and the front oil retainer ring 7 of this embodiment are both variable diameter annular structures composed of a plurality of non-metallic inner sealing blocks in an annular array. Such an arrangement can improve the working efficiency of the oil retainer ring. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five, six or seven.

[0028] Specific implementation method nine: Combination Figure 1 To explain this embodiment, the first turbine rotor 1 and the second turbine rotor 8 of this embodiment are both machined with rotor ring grooves that match the variable diameter annular structures of the rear oil retaining ring 2 and the front oil retaining ring 7. Such an arrangement can improve the working efficiency of the oil retaining ring. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five, six, seven or eight.

[0029] Specific implementation method ten: Combination Figure 1 To explain this embodiment, the rotor support bearing seat No. 1 and the rotor support bearing seat No. 2 of this embodiment are both machined with lubricating oil holes, the end of the horizontal hole section of the L-shaped lubricating oil hole is a lubricating oil port, the lubricating oil port is connected with the side surface of the rotor support bearing seat No. 1 and / or the rotor support bearing seat No. 2, and the vertical hole section of the L-shaped lubricating oil hole is connected with the first bearing mounting hole surface of the rotor support bearing seat No. 1 and / or the second bearing mounting hole surface of the rotor support bearing seat No. 2. With such a configuration, the double support bearing seats are respectively equipped with lubricating oil ports to maintain a good lubrication state of the bearings and reduce wear and failure. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five, six, seven, eight or nine.

[0030] How it works

[0031] Combination Figure 1 The working principle of the bearing box suitable for a double-support bearing structure for double rotors described in the present invention is described as follows: the No. 1 rotor support bearing 3 and the No. 2 rotor support bearing 6 are assembled on the built-in double-support bearing seat of the bearing box body 5, and the clearance is adjusted to support the far ends of the No. 1 turbine rotor 1 and the No. 2 turbine rotor 8, and the two turbine rotors are connected by adjusting the gear 4 to make them move in coordination and improve the operating efficiency.

[0032] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bearing box suitable for a double-rotor double-support bearing structure, characterized in that: The invention comprises a first rotor supporting bearing (3), a bearing box body (5) and a second rotor supporting bearing (6); a first bearing box mounting hole arranged horizontally is processed at the rear end of the bearing box body (5); the first bearing box mounting hole is coaxially arranged with the first rotor (1) of the steam turbine; a second bearing box mounting hole arranged horizontally is processed at the front end of the bearing box body (5); the second bearing box mounting hole is coaxially arranged with the second rotor (8) of the steam turbine; a first rotor supporting bearing (3) is installed on one side of the bearing box body (5) close to the first bearing box mounting hole; the first rotor supporting bearing (3) is installed on the first rotor (1) of the steam turbine; a second rotor supporting bearing (6) is installed on one side of the bearing box body (5) close to the second bearing box mounting hole; the second rotor supporting bearing (6) is installed on the second rotor (8) of the steam turbine.

2. A bearing box suitable for a dual-rotor dual-support bearing structure according to claim 1, characterized in that: An integrally formed No. 1 rotor support bearing seat is provided inside the bearing box body (5), a horizontally arranged first bearing mounting hole is processed on the No. 1 rotor support bearing seat, the No. 1 rotor support bearing (3) is coaxially inserted into the first bearing mounting hole, an interference fit is adopted between the outer ring of the No. 1 rotor support bearing (3) and the first bearing mounting hole of the No. 1 rotor support bearing seat, and an interference fit is adopted between the inner ring of the No. 1 rotor support bearing (3) and the No. 1 rotor (1) of the steam turbine.

3. A bearing box suitable for a dual-rotor dual-support bearing structure according to claim 2, characterized in that: An integrally formed No. 2 rotor support bearing seat is provided inside the bearing box body (5), and a horizontally arranged second bearing mounting hole is processed on the No. 2 rotor support bearing seat. The No. 2 rotor support bearing (6) is coaxially inserted into the second bearing mounting hole. An interference fit is adopted between the outer ring of the No. 2 rotor support bearing (6) and the second bearing mounting hole of the No. 2 rotor support bearing seat, and an interference fit is adopted between the inner ring of the No. 2 rotor support bearing (6) and the No. 2 turbine rotor (8).

4. A bearing box suitable for a dual-rotor dual-support bearing structure according to claim 3, characterized in that: It also includes a rear oil baffle ring (2), which is coaxially embedded in the first bearing box mounting hole at the rear end of the bearing box body (5).

5. A bearing box suitable for a dual-rotor dual-support bearing structure according to claim 4, characterized in that: A rear oil ring mounting groove is machined in the middle of the inner wall of the first bearing box mounting hole, and a rear oil ring mounting protrusion matching the rear oil ring mounting groove is machined on the side wall of the rear oil ring (2), wherein the rear oil ring mounting protrusion is embedded in the rear oil ring mounting groove.

6. A bearing box suitable for a dual-rotor dual-support bearing structure according to claim 5, characterized in that: It also includes a front oil baffle ring (7), which is coaxially embedded in the second bearing box installation hole at the front end of the bearing box body (5).

7. A bearing box suitable for a dual-rotor dual-support bearing structure according to claim 6, characterized in that: A front oil ring mounting groove is machined in the middle of the inner wall of the second bearing box mounting hole, and a front oil ring mounting protrusion matching the front oil ring mounting groove is machined on the side wall of the front oil ring (7), and the front oil ring mounting protrusion is embedded in the front oil ring mounting groove.

8. A bearing box suitable for a dual-rotor dual-support bearing structure according to claim 4 or 6, characterized in that: The rear oil baffle ring (2) and the front oil baffle ring (7) are both variable diameter annular structures formed by a plurality of non-metallic inner sealing blocks in an annular array.

9. A bearing box suitable for a dual-rotor dual-support bearing structure according to claim 8, characterized in that: The first turbine rotor (1) and the second turbine rotor (8) are both machined with rotor ring grooves matching the variable diameter ring structures of the rear oil retaining ring (2) and the front oil retaining ring (7).

10. A bearing box suitable for a dual-rotor dual-support bearing structure according to claim 9, characterized in that: Lubricating oil holes are processed on the No. 1 rotor support bearing seat and the No. 2 rotor support bearing seat. The end of the horizontal hole section of the L-shaped lubricating oil hole is a lubricating oil port. The lubricating oil port is connected with the side surface of the No. 1 rotor support bearing seat and / or the No. 2 rotor support bearing seat. The vertical hole section of the L-shaped lubricating oil hole is connected with the first bearing mounting hole surface of the No. 1 rotor support bearing seat and / or the second bearing mounting hole surface of the No. 2 rotor support bearing seat.

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