A rear support assembly for a cylinder block of a gas turbine

Abstract

The present invention discloses a rear support assembly for a gas turbine, which is used to jointly support a cylinder (1) of the gas turbine with a front support assembly of the gas turbine. The rear support assembly includes a support portion and an adjustment portion. The support portion is connected to the cylinder (1) and can be driven to move by the expansion of the cylinder body (1). The support portion is rotatably connected to the adjustment portion, and the support portion can be driven by the cylinder (1) to rotate relative to the adjustment portion. The cylinder (1) is allowed to rotate around the adjustment portion under the action of thermal expansion or vibration, thereby realizing the adaptive adjustment of the rear support assembly and meeting the requirement of effectively absorbing the thermal expansion or the overall vibration caused by seismic loads and the like.

Description

Technical Field

[0001] The present invention relates to a gas turbine, and more particularly to a rear support assembly of an inlet cylinder of a heavy-duty gas turbine. Background Art

[0002] A gas turbine uses continuously flowing gas as a working medium and converts the thermal energy of the working medium into mechanical work through a rotary power. One of the main functions of the gas turbine support is to provide sufficient support stiffness for the rotor so that the dynamic characteristics of the rotor system meet the requirements. It is divided into a front support assembly and a rear support assembly. The front support assembly is located on the turbine side and mainly bears the weight of the turbine end components; the rear support assembly is arranged on both sides of the cylinder body of the inlet cylinder and mainly bears the weight of the compressor end components.

[0003] In the design of a gas turbine, the rear support assembly is generally used as the relative dead point of the whole machine, which plays an important role in absorbing the thermal expansion of the whole machine, absorbing the vibration of the whole machine, and improving the stability of the whole machine. At present, Siemens uses a long-rod type rear support structure that can deflect to absorb thermal expansion. It selects a long rod with a certain toughness. During assembly, it is pre-bent at a certain angle first, and then under the action of the thermal expansion of the whole machine, the long rod bends in the opposite direction at a certain angle to absorb the thermal expansion amount of the whole machine through the toughness of the material of the long rod itself. At the same time, as the support point of the whole machine, it needs to bear the static load of the whole machine and a part of the vibration load caused by earthquakes, blade loss, etc. The existing rear support structure overly relies on the material properties of the rear support long rod. If the load is too large, it may cause its failure. Because the existing rear support structure needs to have a certain toughness, its diameter and material properties will be restricted, bringing more restrictions to the rotor dynamics and the stiffness of the whole machine.

[0004] When the stiffness of the rear support assembly cannot meet the requirements, it will affect the stability of the whole gas turbine. In view of the above technical problems, the present invention is specifically proposed. Summary of the Invention

[0005] The main object of the present invention is to provide an adaptively adjustable rear support assembly to solve the problem that the existing rear support assembly of the inlet cylinder cannot simultaneously meet the requirements of being adaptively adjustable and having sufficient stiffness.

[0006] To achieve the above object, according to one aspect of the present invention, a rear support assembly for a gas turbine is provided, which is used to jointly support the cylinder of the gas turbine with the front support assembly of the gas turbine. It is characterized in that the rear support assembly includes a support part and an adjustment part. The support part is connected to the cylinder and can be driven by the expansion of the cylinder block to move. The support part is rotatably connected to the adjustment part, and the support part can be driven by the cylinder to rotate relative to the adjustment part. It meets the requirement of being able to effectively absorb the thermal expansion or the whole machine vibration caused by seismic loads, etc. The design that the support part in the adaptive adjustment rear support assembly can rotate around the adjustment part enables the support part to select materials with better stiffness, thereby improving the stability of the whole machine and increasing the rotor dynamics and the stiffness margin of the whole machine.

[0007] Further, the support part rotates relative to the adjustment part along the expansion or contraction direction of the cylinder, and / or the support part moves relative to the adjustment part in the horizontal direction. The support part can adaptively adjust according to the expansion or contraction direction of the cylinder.

[0008] Further, the rotation angle of the support part relative to the adjustment part is less than 1°.

[0009] Further, the rotation angle is greater than 0.2° and less than 0.5°.

[0010] Further, the support part includes at least two main rods, and the main rods are located on both sides of the cylinder and are fixedly connected to the cylinder. When the cylinder expands or vibrates left and right, it can also move slightly in the left and right directions, which can further absorb the deformation of the cylinder caused by thermal expansion and vibration, that is, the adaptive adjustment of the rear support assembly is further realized.

[0011] Further, the main rod is an L-shaped rod. The section of the L-shaped rod in the vertical direction is the main rod support rod, and the section of the L-shaped rod in the horizontal direction is the main rod rotating shaft; the main rod support rod is used to support the cylinder, and the main rod rotating shaft is used for rotational cooperation with the adjustment part.

[0012] Further, the adjustment part includes a base, and the base is provided with a rotation hole, and each main rod is rotatably connected to the base through the rotation hole.

[0013] Further, the adjustment part further includes a bearing, and the bearing is installed in the base and is rotatably connected to the main rod rotating shaft. The bearing reduces the wear between the main rod rotating shaft and the base.

[0014] Further, the bearing is a self-lubricating bushing or a tilting pad bearing.

[0015] Further, the base includes an upper base part and a lower base part. The upper base part includes a first limiting channel for accommodating the main rod rotating shaft, and the lower base includes a second limiting channel for accommodating the main rod rotating shaft.

[0016] Further, a semi-circular groove is provided at the end of the second limiting channel for accommodating the bearing.

[0017] Further, the upper base part and the lower base part are connected by bolts.

[0018] Further, the main rod and the cylinder are fixedly connected by a locking top cap.

[0019] The adaptive adjustment rear support assembly of the present invention can adaptively adjust the rotation angle of the support part and the displacement of the support part along the left and right of the limiting channel according to the thermal expansion and vibration of the gas turbine, etc. At the same time, the adaptive adjustment rear support assembly of the present invention can improve the support stiffness of the adaptive adjustment rear support assembly by adding reinforcing ribs, selecting a thicker main rod diameter, and a main rod material with better strength, etc., further improving the overall stability of the machine and increasing the rotor dynamics and the overall machine stiffness margin. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 shows a schematic diagram of the adaptive adjustment rear support assembly for a gas turbine according to the present invention during operation; and

[0022] Figure 2 shows a schematic diagram of the structure of the base part according to the present invention; and

[0023] Figure 3 shows a three-dimensional schematic diagram according to the present invention;

[0024] Figure 4 shows a schematic diagram of the adaptive adjustment rear support assembly for a gas turbine according to the second embodiment of the present invention during operation.

[0025] Among them, the above-mentioned drawings include the following reference numerals:

[0026] 1, cylinder; 2, locking top cap; 3, support nut; 4, main rod support rod;

[0027] 5, main rod rotating shaft; 6, upper base part; 7, lower base part; 8, first limiting channel;

[0028] 9, bearing; 10, base split surface; 11, reinforcing rib; 12, second limiting channel; 13, semi-circular groove;

[0029] X: horizontal direction; Y: vertical direction. Detailed implementation manners

[0030] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0031] The present invention will be further described in detail below in combination with specific embodiments, and these embodiments should not be construed as limiting the scope claimed by the present invention. The term "comprising" indicates the presence of features when used, but does not exclude the presence or addition of one or more other features; the terms "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention; in addition, the terms "first", "second", etc. are used to distinguish different objects, rather than to describe a specific order.

[0032] In the description, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", and "couple" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In addition, in the description of the present invention, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0033] The gas turbine converts the thermal energy of the continuously flowing gas into mechanical work through the rotor system. During its working process, the rear support assembly is required to be able to well absorb the deformation caused by the thermal expansion and vibration of the whole machine, and at the same time, be able to provide sufficient support stiffness, so as to improve the stability of the whole machine and increase the rotor dynamics and the stiffness margin of the whole machine.

[0034] The adaptive adjustment rear support assembly for a gas turbine of the present invention is used to jointly support the cylinder 1 of the gas turbine with the front support assembly of the gas turbine. In the design of a gas turbine, the rear support assembly generally serves as the relative dead point of the whole machine and plays an important role in absorbing the thermal expansion of the whole machine, absorbing the vibration of the whole machine, and improving the stability of the whole machine. The adaptive adjustment rear support assembly includes a support part and an adjustment part. The support part is connected to the cylinder 1 and can be driven by the expansion of the cylinder body to move. The support part is rotationally connected to the adjustment part and fixedly connected to the cylinder 1, so as to drive the cylinder 1 to rotate relative to the adjustment part, allowing the cylinder 1 to rotate around the adjustment part under the action of thermal expansion or vibration, thereby realizing the adaptive adjustment of the rear support assembly and meeting the requirement of effectively absorbing the thermal expansion or the vibration of the whole machine caused by seismic loads, etc. The design that the support part of the adaptive adjustment rear support assembly can rotate around the adjustment part enables the support part to select materials with better stiffness, thereby improving the stability of the whole machine and increasing the rotor dynamics and the stiffness margin of the whole machine.

[0035] During the adaptive adjustment process of the support assembly, the support part rotates relative to the adjustment part along the expansion or contraction direction of the cylinder 1, and can also move relative to the adjustment part along the horizontal direction X.

[0036] Since the support stiffness of the front support assembly of the gas turbine is much greater than that of the rear support assembly, when the gas turbine is heated and expands, the whole machine has a tendency to move backward by about 25 mm. In order to absorb this thermal expansion of about 25 mm, the support part needs to rotate relative to the adjustment part. The rotation angle of the support part relative to the adjustment part is less than 1°, preferably greater than 0.2° and less than 0.5°. Due to the large size of the gas turbine, this small-angle movement will not affect the normal operation of the gas turbine. Moreover, the structure of this small-angle movement is similar to a crank-slider mechanism. The gas turbine is equivalent to the slider, and the support part is equivalent to the crank. Because of the thermal expansion or vibration displacement of the gas turbine, the slider is displaced, thus driving the crank support part to rotate clockwise. When the gas turbine stops or the vibration displacement disappears, the gas turbine drives the crank support part to rotate counterclockwise again. Through this small-angle angular displacement, the adaptive adjustment of the rear support assembly is conveniently realized.

[0037] As Figures 1 - 3 shown, the support part of the adaptive adjustment rear support assembly includes at least two main rods. The main rods are located on both sides of the cylinder 1 and are fixedly connected to the cylinder 1, and can be connected to the cylinder 1 through fixing means such as locking caps 2. The adjustment part of the adaptive adjustment rear support assembly includes a base. The base is provided with a rotation hole, and each main rod is rotationally connected to the base through the rotation hole.

[0038] The support part can also be of a U-shaped structure, but designing it as two main rods can increase the convenience of installation and relatively reduce the requirements for the overall machining accuracy. When the two main rods jointly support the cylinder 1, when the cylinder 1 expands or vibrates left and right, it can also move slightly in the left and right directions, which can further absorb the deformation of the cylinder 1 caused by thermal expansion and vibration, that is, further realize the adaptive adjustment of the rear support assembly.

[0039] Among them, the main rod is an L-shaped cylindrical rod. The section in the vertical direction Y is the main rod support rod 4, and the section in the horizontal direction X is the main rod rotating shaft 5. The main rod support rod 4 is used to support the cylinder 1, and its end is processed with threads and fixedly connected to the fixed hole plate welded on the cylinder 1 by bolt connection. In order to ensure the reliability of the connection, a support nut 3 can also be additionally installed on the lower side of the fixed hole plate, and reliable thread fixation is achieved through a double-thread method, which can largely avoid loosening caused by vibration and the like. The main rod rotating shaft 5 of the main rod in the horizontal direction X is used for rotational cooperation with the adjustment part, playing the role of a rotating shaft, so that the support part drives the cylinder 1 to rotate relative to the adjustment part.

[0040] The diameter and material of the main rod are obtained through actual calculation. In order to further increase the overall stiffness of the rear support assembly, a reinforcing rib 11 can be added at the L-shaped main rod, as Figure 4 shown. Adding the reinforcing rib 11 can greatly enhance the stiffness of the L-shaped main rod, improve the stability of the rear support assembly while realizing adaptive adjustment, thereby enhancing the overall stability of the machine, and improving the rotor dynamics and the overall stiffness margin.

[0041] Of course, the shape of the main rod is not limited to being L-shaped, as long as it has the structural form of the main rod support rod 4 and the main rod rotating shaft 5.

[0042] In addition to including the base, the adjustment part is also installed with a bearing 9. The bearing 9 is installed in the base and is rotationally connected to the main rod. The bearing 9 can be a sliding bearing 9 or a tilting pad bearing 9, and is rotationally connected to the main rod rotating shaft 5.

[0043] The base is a split structure from top to bottom, including an upper base part 6 and a lower base part 7. The upper base part 6 and the lower base part 7 form a base split surface 10. As Figures 2 - 3 described, the lower base part 7 is a plate-like structure with a certain width and a certain thickness. Along the center line of the lower base part 7 in the horizontal direction X, two symmetric second limiting channels 12 are processed. Figure 2 In, the two second limiting channels 12 do not penetrate the entire lower base part 7. At the center position of the lower base part 7, there is an unprocessed structure that plays a limiting role. Between the second limiting channels 12 and the unprocessed structure, a semi-circular channel 13 with a larger radius is additionally opened for accommodating the bearing 9, and the radius of the semi-circular channel 13 depends on the thickness of the bearing 9.

[0044] At both ends of the corresponding upper base part 6, first limit channel grooves 8 for accommodating the main rod are also provided, and the radius of the first limit channel grooves 8 is the same as that of the semi-circular channel grooves 13. Similarly, the first limit channel grooves 8 do not penetrate the entire upper base part 6, and there is also an unprocessed structure at the central position, with a length consistent with that of the unprocessed structure of the lower base part 7. The upper base part 6 and the lower base part 7 are connected by bolts, and an installation space for accommodating the bearing 9 is formed after the upper and lower bases are connected.

[0045] When installing the adaptive adjustment rear support assembly, first install the bearing 9 in the semi-circular groove surface of the lower base part 7, then align the installation holes of the upper base part 6 with the installation holes of the lower base, and pre-tighten with bolts. Then, respectively install the main rod rotating shafts 5 of the two main rods into the bearing 9.

[0046] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: The adaptive adjustment rear support assembly of the present invention can adaptively adjust the rotation angle of the support part and the displacement of the support part along the left and right of the limit channel grooves according to the thermal expansion and vibration of the gas turbine, etc. At the same time, the adaptive adjustment rear support assembly of the present invention can improve the support stiffness of the adaptive adjustment rear support assembly by adding reinforcing ribs 11, selecting a thicker main rod diameter, and a main rod material with better strength, etc., further improve the overall stability of the machine, and improve the rotor dynamics and the overall stiffness margin.

[0047] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A rear support assembly for a cylinder of a gas turbine, which is used to support the cylinder (1) of the gas turbine together with the front support assembly of the gas turbine, and is characterized in that, The rear support assembly includes a support portion and an adjustment portion. The support portion is connected to the cylinder (1) and can be driven to move by the expansion of the cylinder body. The support portion is rotatably connected to the adjustment portion, and the support portion can be driven by the cylinder (1) to rotate relative to the adjustment portion; the support portion rotates relative to the adjustment portion along the expansion or contraction direction of the cylinder (1), and / or the support portion moves relative to the adjustment portion in the horizontal direction; the support portion includes at least two main rods located on both sides of the cylinder (1) and fixedly connected to the cylinder (1); the main rods are L-shaped rods, the vertical section of the L-shaped rod is the main rod support rod (4), and the horizontal section of the L-shaped rod is the main rod rotating shaft (5); the main rod support rod (4) is used to support the cylinder (1), and the main rod rotating shaft (5) is used for rotational cooperation with the adjustment portion.

2. The rear support assembly according to claim 1, characterized in that, The rotation angle of the support portion relative to the adjustment portion is less than 1°.

3. The rear support assembly according to claim 2, characterized in that, The rotation angle is greater than 0.2° and less than 0.5°.

4. The rear support assembly according to any one of claims 3, characterized in that The adjustment portion includes a base provided with a rotation hole, and each main rod is rotatably connected to the base through the rotation hole.

5. The rear support assembly according to claim 4, wherein The adjustment portion further includes a bearing (9) installed in the base and rotatably connected to the main rod rotating shaft (5).

6. The rear support assembly according to claim 5, characterized in that, The bearing (9) is a self-lubricating bushing or a tilting pad bearing (9).

7. The rear support assembly according to claim 6, wherein The base includes an upper base part (6) and a lower base part (7). The upper base part (6) includes a first limiting channel (8) for accommodating the main rod rotating shaft (5), and the lower base part (7) includes a second limiting channel (12) for accommodating the main rod rotating shaft (5).

8. The rear support assembly according to claim 7, wherein A semi-circular channel (13) is provided at the end of the second limiting channel (12) for accommodating the bearing (9).

9. The rear support assembly according to claim 7 or 8, characterized in that, The upper base part (6) and the lower base part (7) are connected by bolts.

10. The rear support assembly according to claim 1, wherein, The main rod is fixedly connected to the cylinder (1) through a locking top cap (2).

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