Static pressure supporting structure for horizontal lathe machining of steam turbine rotor

Abstract

The invention relates to a static pressure supporting structure, in particular to a static pressure supporting structure for turbine rotor horizontal lathe machining. The problems that a large number of bearing bushes of different sizes need to be manufactured in the machining process of a steam turbine rotor, the bearing bushes are prone to deformation and damage, and consequently the manufacturing cost is high are solved. The device comprises a base, a static pressure bearing bush and four side vertical plates. The four side vertical plates are fixedly connected to the upper surface of the base, and a bearing bush mounting cavity is defined by the four side vertical plates and the base. A positioning groove is formed in the upper surface of the base; the static pressure bearing bush is arranged in the bearing bush mounting cavity; the static pressure bearing bush can well meet the use requirements of different shaft neck sizes of a heavy rotor, the universality is improved, the static pressure bearing bush is not prone to deformation under the constraint of the four side vertical plates, and compared with an aluminum alloy bearing bush, the static pressure bearing bush can better adapt to a steam turbine rotor with the large weight. The invention belongs to the technical field of static pressure supporting.

Description

Technical Field

[0001] The invention relates to a static pressure support structure, in particular to a static pressure support structure for horizontal lathe processing of a steam turbine rotor, and belongs to the technical field of static pressure support. Background Art

[0002] With the technological development of the steam turbine industry, steam turbine rotors are becoming larger and more complex in structure, especially nuclear power rotors and ordinary civilian rotors. Due to the obvious structural differences between different rotors, it is often necessary to frequently replace the bearings on the static pressure bracket during the machining of the rotor on the horizontal lathe.

[0003] The bearings on the existing static pressure brackets are relatively thin, and a large number of bearings with different radial sizes need to be prepared when processing different rotors, which significantly increases the manufacturing cost. In addition, the weight of rotors above 800MW is currently over 100 tons. Although aluminum alloy bearings are very versatile, when used for rotors of this weight, the bearings and brackets are very easy to deform, causing burning of the bearings and damage to the bracket.

[0004] In summary, how to propose a static pressure support structure to address the above technical issues has become an urgent problem to be solved by technicians in this field. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a static pressure support structure for horizontal lathe processing of a steam turbine rotor.

[0006] The technical solution of the present invention is: a static pressure support structure for horizontal lathe processing of a steam turbine rotor, comprising a base, a static pressure bearing bush and four side vertical plates.

[0007] The four side plates are fixedly connected to the upper surface of the base, and the four side plates and the base form a bearing installation cavity. A positioning groove is opened on the upper surface of the base, and the hydrostatic bearing is arranged in the bearing installation cavity, and a positioning tenon is integrally provided on the lower surface of the hydrostatic bearing, and the positioning tenon is embedded in the positioning groove. A first oil hole is processed on the base, and a second oil hole and a plurality of oil cavities are processed on the hydrostatic bearing, and the first oil hole, the second oil hole and the oil cavity are connected in sequence.

[0008] Compared with the prior art, the present invention has the following effects:

[0009] 1. The structure of the present invention is simple, and the static pressure bearing bush 3 can be bored many times, so the service life of the present invention is long, which greatly saves the production cost of the turbine rotor.

[0010] 2. The present invention can well meet the use requirements of heavy rotors with different journal sizes, improves versatility, and the hydrostatic bearing 3 is not easily deformed under the constraints of the four side plates 2. Compared with aluminum alloy bearings, it is more adaptable to heavier turbine rotors. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is an axonometric view of base 1;

[0012] Figure 2 It is an axonometric view of the base 1 and the side stand 2;

[0013] Figure 3 is an axonometric view of the present invention;

[0014] Figure 4 It is a cross-sectional view of the present invention.

[0015] Figure 5 It is a schematic diagram showing that the hydrostatic bearing bush 5 of the present invention can be bored multiple times.

[0016] In the figure: 1, base; 1-1, first oil hole; 2, side plate; 3, hydrostatic bearing; 3-1, second oil hole; 3-2, oil cavity. DETAILED DESCRIPTION

[0017] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0018] Specific implementation method 1: Combination Figures 1 to 4 The present embodiment is described. A hydrostatic support structure for horizontal lathe processing of a steam turbine rotor comprises a base 1 , a hydrostatic bearing 3 and four side plates 2 .

[0019] The four side plates 2 are all fixedly connected to the upper surface of the base 1, and the four side plates 2 and the base 1 form a bearing installation cavity.

[0020] A positioning groove is provided on the upper surface of the base 1, and the hydrostatic bearing 3 is arranged in the bearing installation cavity. The height of the hydrostatic bearing 3 is slightly greater than the height of the side plate 2, and a positioning tenon is integrally provided on the lower surface of the hydrostatic bearing 3, and the positioning tenon is embedded in the positioning groove. Such an arrangement, on the one hand, is convenient for fixing the hydrostatic bearing 3 and the base 1, and on the other hand, the portion of the hydrostatic bearing 3 higher than the side plate 2 can provide stable slewing support for the turbine rotor, and the portion of the hydrostatic bearing 3 lower than the side plate 2 can avoid being compressed and deformed under the constraint of the four side plates 2.

[0021] A first oil hole 1-1 is formed on the base 1, and a second oil hole 3-1 and a plurality of oil chambers 3-2 are formed on the hydrostatic bearing 3. The first oil hole 1-1, the second oil hole 3-1 and the oil chamber 3-2 are connected in sequence. With such an arrangement, after an external oil supply device supplies oil to the first oil hole 1-1, it can be ensured that the friction surfaces between the hydrostatic bearing 3 and the turbine rotor can be fully lubricated.

[0022] Specific implementation method 2: Combination Figure 3 The present embodiment is described. In the present embodiment, the number of the oil chambers 3-2 is 4, and the oil chambers 3-2 are distributed on the circumferential surface of the hydrostatic bearing 3. Such a configuration has the following advantages:

[0023] 1. The oil chamber 3-2 can store lubricating oil to ensure that when the turbine rotor contacts the static pressure bearing 3, the lubricating oil can be quickly supplied to the friction surface to form an oil film and reduce friction and wear.

[0024] 2. The four oil chambers 3-2 help to evenly distribute the lubricating oil on the circumferential surface of the hydrostatic bearing 3, ensuring that the entire circumferential surface of the hydrostatic bearing 3 can be fully lubricated, reducing local overheating and wear, and ensuring that the present invention can operate efficiently and stably.

[0025] Other components and connection relationships are the same as those in the first specific implementation method.

[0026] Specific implementation method three: Combination Figures 2 to 4 To explain this embodiment, in this embodiment, the base 1 and the side panels 2 are both made of low-carbon steel, which can reduce the cost of the present invention while ensuring the strength in use.

[0027] Furthermore, the material of the hydrostatic bearing bush 3 is babbitt alloy. Such a configuration has the following advantages:

[0028] 1. Babbitt alloy has a low friction coefficient and good wear resistance, which can effectively reduce the wear between the static pressure bearing 3 and the turbine rotor, and extend the service life of the static pressure bearing 3. Compared with other high-strength alloys, the cost of Babbitt alloy is low, thereby reducing the cost of the present invention.

[0029] 2. Babbitt alloy has good anti-seizure properties and can effectively prevent the seizure between the turbine rotor and the static pressure bearing 3 in the case of poor lubrication or rupture of the lubricating oil film.

[0030] 3. Babbitt alloy has good thermal conductivity, which can prevent the hydrostatic bearing 3 from overheating. Babbitt alloy is easy to cast and process, and can meet the needs of bearings of various shapes and sizes.

[0031] The other components and connection relationships are the same as those in the first or second specific implementation.

[0032] Specific implementation method four: Combination Figure 3 and Figure 4 In this embodiment, the hydrostatic bearing 3 is a cast bearing. This arrangement has the following advantages:

[0033] 1. The casting molding has high production efficiency and high material utilization rate, which reduces material waste and reduces the cost of the present invention.

[0034] 2. Casting can produce structures with complex shapes. The hydrostatic bearing 3 is directly cast in the bearing installation cavity, and the positioning tenon is directly integrally formed with the hydrostatic bearing 3, which is convenient for fixing the hydrostatic bearing 3 and the base 1.

[0035] The other components and connection relationships are the same as those of the first, second or third specific implementation modes.

[0036] How it works

[0037] Combination Figures 1 to 5 The working principle of the present invention is described:

[0038] The present invention comprises a base 1, a static pressure bearing bush 3 and four side plates 2.

[0039] The four side plates 2 are all fixedly connected to the upper surface of the base 1, and the four side plates 2 and the base 1 form a bearing installation cavity. The hydrostatic bearing 3 is made of Babbitt alloy. The hydrostatic bearing 3 is directly cast in the bearing installation cavity to ensure the fixation between the hydrostatic bearing 3 and the base 1.

[0040] When in use, the curvature radius of the circumferential surface of the static pressure bearing 3 is bored to the journal size according to the journal size of the turbine rotor, and the four side plates 2 are processed so that the height of the side plates 2 is lower than the height of the static pressure bearing 3.

[0041] like Figure 5 As shown, when the journal size of the turbine rotor changes, the hydrostatic bearing 3 is re-bored, that is, the position of the boring bar is adjusted so that the boring bar is raised or lowered relative to the hydrostatic bearing 3, and then a new radius of curvature is bored, so that the hydrostatic bearing 3 is suitable for the turbine rotor after the journal changes. In the present invention, the height of the hydrostatic bearing 3 after casting is greater than 60 mm, so the hydrostatic bearing 3 can be bored many times, and thus the service life of the present invention is very long, which greatly saves the production cost of the turbine rotor.

[0042] The present invention has been disclosed as above in the form of a preferred embodiment, but it is not intended to limit the present invention. Any simple modification, equivalent changes and modifications made to the above implementation cases by any professional and technical personnel who do not deviate from the content of the technical solution of the present invention and based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A static pressure support structure for horizontal lathe processing of a steam turbine rotor, characterized in that: It comprises a base (1), a static pressure bearing (3) and four side panels (2); The four side plates (2) are all fixedly connected to the upper surface of the base (1), and the four side plates (2) and the base (1) enclose a bearing installation cavity; The upper surface of the base (1) is provided with a positioning groove, the hydrostatic bearing (3) is arranged in the bearing installation cavity, and the lower surface of the hydrostatic bearing (3) is integrally provided with a positioning tenon, which is embedded in the positioning groove; A first oil hole (1-1) is machined on the base (1), a second oil hole (3-1) and a plurality of oil chambers (3-2) are machined on the static pressure bearing bush (3), and the first oil hole (1-1), the second oil hole (3-1) and the oil chamber (3-2) are connected in sequence.

2. The static pressure support structure for horizontal lathe processing of a steam turbine rotor according to claim 1, characterized in that: The number of the oil chambers (3-2) is four.

3. The static pressure support structure for horizontal lathe processing of a steam turbine rotor according to claim 2, characterized in that: The base (1) and the side panels (2) are both made of low-carbon steel.

4. The static pressure support structure for horizontal lathe processing of a steam turbine rotor according to claim 3 is characterized in that: The material of the static pressure bearing bush (3) is Babbitt alloy.

5. The static pressure support structure for horizontal lathe processing of a steam turbine rotor according to claim 4, characterized in that: The hydrostatic bearing (3) is a casting-molded bearing.

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