Novel turbine steam chamber structure integrated with cylinder

Abstract

The invention discloses a novel turbine steam chamber structure integrated with a cylinder, which is characterized by comprising a steam chamber upper half upper part, a steam chamber upper half lower part and a group of spring pieces, the upper part of the steam chamber upper half and the cylinder upper half are cast into an integral structure, so that the strength of the cylinder upper half is enhanced; the upper portion of the steam chamber upper half and the lower portion of the steam chamber upper half are sealed through a set of spring pieces, the sealing performance of all cavities of the steam chamber is guaranteed, and the sealing performance of connection between the upper portion of the steam chamber upper half and the lower portion of the steam chamber upper half is guaranteed. The invention relates to the technical field of steam chamber structures, in particular to a novel steam chamber structure of a steam turbine integrated with a cylinder. The technical problem to be solved by the invention is to provide the novel steam chamber structure of the steam turbine integrated with the cylinder, and the problem of steam leakage of the cylinder caused by deformation due to steam pressure due to different strength of the upper half part and the lower half part of the cylinder due to the structure in the running process of the steam turbine is solved.

Description

Technical Field

[0001] The invention relates to the technical field of steam chamber structures, and in particular to a novel steam chamber structure of a steam turbine which is integrated with a cylinder. Background Art

[0002] A steam turbine is a power machine that uses steam as a working fluid and converts steam thermal energy into rotor rotational mechanical energy. It is widely used in the electric power, petrochemical, metallurgical and other industries. The cylinder, also known as the casing, is the largest component in a steam turbine. It can be roughly regarded as a sealed container that withstands temperature and pressure; most cylinders are divided into upper and lower halves from a horizontal center plane, and the upper and lower halves are connected and sealed by flanges and bolts. The connecting surface between the upper and lower halves of the cylinder is the horizontal center plane of the cylinder. The steam chamber is an internal device of the steam turbine that concentrates and distributes steam; it is divided into upper and lower halves from the horizontal center plane of the cylinder, and the upper and lower halves are connected and sealed by flanges and bolts, such as Figure 4 shown.

[0003] During the operation of the steam turbine, the cylinder, as a pressure-bearing part, is subjected to the effects of steam pressure and temperature, which will inevitably produce a certain amount of deformation. Due to the different strengths of the upper and lower halves of the cylinder due to structural reasons, the deformation of the upper and lower halves will differ greatly, resulting in a large deformation of the horizontal center surface of the cylinder and an increased risk of steam leakage.

[0004] Disadvantages of existing technology:

[0005] (1) Increasing the thickness of the horizontal center flange of the cylinder increases the casting cost; the weight of the cylinder increases, and the difficulty of processing and installation becomes greater; and due to the overall structure of the cylinder, the increase in the thickness of the horizontal center flange of the cylinder is limited.

[0006] (2) Increasing the diameter of the horizontal center plane connecting bolts will increase the difficulty of turbine processing and installation.

[0007] (3) Increase the tightening force of the connecting bolts, because the stress gradient at the horizontal center plane where the bolts are subjected to force extends greatly toward the inside of the cylinder in the horizontal direction, which can easily cause an opening in the cylinder and may lead to steam leakage from the horizontal center plane. When the bolts are tightened, the bolts cause great stress at the horizontal center plane of the cylinder, and the horizontal center plane is easily deformed after being subjected to force, resulting in steam leakage. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a new type of steam turbine steam chamber structure integrated with the cylinder, so as to solve the problem of steam leakage in the cylinder caused by the different strengths of the upper and lower halves of the cylinder due to structural reasons and deformation due to steam pressure during the operation of the steam turbine.

[0009] The present invention adopts the following technical solutions to achieve the invention objectives:

[0010] A novel steam chamber structure of a steam turbine integrated with a cylinder, characterized in that it comprises: an upper portion of the steam chamber, an upper portion of the steam chamber and a group of spring sheets; the upper portion of the steam chamber and the upper portion of the cylinder are cast into an integral structure to increase the strength of the upper portion of the cylinder; the upper portion of the steam chamber and the upper portion of the steam chamber are sealed with a group of the spring sheets to ensure the sealing between the various chambers of the steam chamber and the sealing of the connection between the upper portion of the steam chamber and the upper portion of the steam chamber.

[0011] As a further limitation of the present technical solution, the lower part of the upper half of the steam chamber is fixedly connected to the lower half of the steam chamber by a set of bolts.

[0012] As a further limitation of the present technical solution, the upper half of the cylinder and the lower half of the cylinder are fixedly connected by a set of cylinder bolts.

[0013] As a further limitation of the present technical solution, the upper half of the cylinder and the upper half flange of the cylinder are an integrally cast structure, the lower half of the cylinder and the lower half flange of the cylinder are an integrally cast structure, and the upper half flange of the cylinder and the lower half flange of the cylinder are fixedly connected by a group of split-surface bolts in the cylinder.

[0014] As a further limitation of the present technical solution, the upper part of the steam chamber and a group of upper partition ribs are an integrally cast structure, the upper lower part of the steam chamber and a group of lower partition ribs are an integrally cast structure, and each of the upper partition ribs and each of the lower partition ribs are respectively fixedly connected to the corresponding spring sheet.

[0015] As a further limitation of the present technical solution, each of the lower partition ribs is respectively provided with a partition rib groove, and each of the spring sheets is respectively arranged in the corresponding partition rib groove.

[0016] As a further limitation of the present technical solution, each screw passes through the corresponding spring sheet and is threadedly connected to the corresponding lower partition rib.

[0017] As a further limitation of the technical solution, a group of the spring sheet openings are directed toward an upper portion of the steam chamber, a lower portion of the upper portion of the steam chamber, and an area consisting of a lower portion of the steam chamber.

[0018] Compared with the prior art, the advantages and positive effects of the present invention are:

[0019] 1. The present invention casts the upper part of the steam chamber and the upper part of the cylinder into one piece, thereby increasing the strength of the upper part of the cylinder, making the strength of the upper and lower parts of the cylinder close, and the deformation amount is almost the same, thereby reducing the risk of steam leakage in the horizontal center plane of the cylinder, thereby ensuring the efficiency of the steam turbine; the interior of the steam chamber is connected with a spring sheet to ensure its good sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The structure of the present invention is schematically shown Figure 1 .

[0021] Figure 2 It is a partial front view of the present invention.

[0022] Figure 3 For the present invention Figure 2 A partial enlarged view of middle A.

[0023] Figure 4 This is a schematic diagram of the existing independent steam chamber structure.

[0024] Figure 5 This is a schematic diagram of the thickness of the flange on the horizontal center plane of the existing cylinder.

[0025] Figure 6 This is a schematic diagram of the existing increase in the diameter of the horizontal center plane connection bolts.

[0026] In the figure: 1, upper half of the cylinder, 2, upper part of the upper half of the steam chamber, 3, upper partition rib, 4, lower part of the upper half of the steam chamber, 5, center bolt of the cylinder, 6, upper flange of the cylinder, 7, lower flange of the cylinder, 8, lower half of the cylinder, 9, lower partition rib, 10, lower half of the steam chamber, 11, cylinder bolt, 12, screw, 13, spring sheet, 14, partition rib groove. DETAILED DESCRIPTION

[0027] A specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation.

[0028] The cylinder is the largest component in the steam turbine. It can be roughly regarded as a sealed container that withstands temperature and pressure. Most cylinders are divided into upper and lower halves from the horizontal center plane; the upper and lower halves are connected and sealed by flanges and bolts. Since the cylinder is subjected to internal pressure and high temperature, and because the cylinder shape is relatively complex, the mutual restriction of deformation at the junction of the plate and shell causes a significant increase in the local stress of the cylinder. There may be greater stress at the cylinder flange connection; due to different deformation laws, local peak stress may also occur.

[0029] The current steam chambers all use an independent steam chamber structure and are not integrated with the cylinder (such as Figure 6 This structure is simple to cast and easy to install; however, due to the large volume of the steam chamber, the required opening size at the top of the cylinder will be very large, which causes the strength of the upper half of the cylinder to drop seriously, while the strength difference with the lower half of the cylinder becomes larger; when the steam turbine is running, it will cause uneven force on the upper and lower halves of the cylinder, and the strength of the upper half is too small, resulting in serious deformation, causing steam leakage on the horizontal center surface of the cylinder.

[0030] The current technical measures are: increase the thickness of the horizontal center flange of the cylinder (such as Figure 5Increase the diameter of the horizontal center plane connecting bolts and increase the tightening force of the connecting bolts.

[0031] The present invention comprises: a steam chamber upper half 2, a steam chamber upper half 4 and a group of spring sheets 13; the steam chamber upper half 2 and the cylinder upper half 1 are cast into an integral structure to increase the strength of the cylinder upper half 1; the steam chamber upper half 2 and the steam chamber upper half 4 are sealed by a group of spring sheets 13 to ensure the sealing between the various chambers of the steam chamber, to ensure the sealing of the connection between the steam chamber upper half 2 and the steam chamber upper half 4, and to avoid steam leakage between the chambers.

[0032] The length of the spring sheet 13 is consistent with the width of the steam chamber, and the function of the spring sheet 13 is to ensure the sealing between adjacent chambers.

[0033] The upper half of the steam chamber 2 may not be fixedly connected to the spring sheet 13, but the spring sheet 13 may be compressed. The upper half of the steam chamber 2 compresses the spring sheet 13 to seal the adjacent chambers and prevent steam from flowing into each other.

[0034] The upper lower part 4 of the steam chamber is fixedly connected with the lower half 10 of the steam chamber by a set of bolts.

[0035] The cylinder upper half 1 and the cylinder lower half 8 are fixedly connected by a set of cylinder bolts 11.

[0036] The cylinder upper half 1 and the cylinder upper half flange 6 are cast as an integral structure, the cylinder lower half 8 and the cylinder lower half flange 7 are cast as an integral structure, and the cylinder upper half flange 6 and the cylinder lower half flange 7 are fixedly connected by a group of cylinder center face bolts 5.

[0037] The upper part 2 of the steam chamber and a group of upper partition ribs 3 are cast as an integral structure, and the lower part 4 of the steam chamber and a group of lower partition ribs 9 are cast as an integral structure. Each of the upper partition ribs 3 and each of the lower partition ribs 9 are fixedly connected to the corresponding spring sheet 13.

[0038] Each of the lower partition ribs 9 is respectively provided with a partition rib groove 14 , and each of the spring sheets 13 is respectively arranged in the corresponding partition rib groove 14 .

[0039] Each screw 12 passes through the corresponding spring sheet 13 and is threadedly connected to the corresponding lower partition rib 9 .

[0040] A spring sheet 13 is provided at a sealing position between the upper half 2 of the steam chamber and the lower half 4 of the steam chamber. The spring sheet 13 is fixed to the lower partition rib 9 with screws 12 at the joint position with the upper half 2 of the steam chamber.

[0041] A group of the spring sheets 13 opens toward the vertical center of the area consisting of the upper half 2 of the steam chamber, the lower half 4 of the steam chamber and the lower half 10 of the steam chamber.

[0042] The present invention casts the upper part 2 of the steam chamber and the upper part 1 of the cylinder into one piece, thereby increasing the strength of the upper part 1 of the cylinder, making the strength of the upper and lower parts of the cylinder close and the deformation almost the same, thereby reducing the risk of steam leakage on the horizontal center plane of the cylinder; the interior of the steam chamber is connected with a spring sheet 13 to ensure its good sealing performance.

[0043] The above disclosure is only a specific embodiment of the present invention, but the present invention is not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A new type of steam turbine steam chamber structure integrated with the cylinder, characterized in that: include: The upper half of the steam chamber (2), the lower half of the steam chamber (4) and a set of spring sheets (13); The upper part (2) of the steam chamber is cast into an integral structure with the upper part (1) of the cylinder, thereby increasing the strength of the upper part (1) of the cylinder; The upper half (2) of the steam chamber and the lower half (4) of the steam chamber are sealed by a group of spring sheets (13) to ensure the sealing between the chambers of the steam chamber and the sealing of the connection between the upper half (2) of the steam chamber and the lower half (4) of the steam chamber.

2. The novel steam chamber structure of a steam turbine integrated with a cylinder according to claim 1 is characterized in that: The upper lower part (4) of the steam chamber is fixedly connected to the lower half (10) of the steam chamber by a set of bolts.

3. The novel steam chamber structure of a steam turbine integrated with a cylinder according to claim 1 is characterized in that: The cylinder upper half (1) and the cylinder lower half (8) are fixedly connected by a set of cylinder bolts (11).

4. The novel steam chamber structure of a steam turbine integrated with a cylinder according to claim 3 is characterized in that: The cylinder upper half (1) and the cylinder upper half flange (6) are an integrally cast structure, the cylinder lower half (8) and the cylinder lower half flange (7) are an integrally cast structure, and the cylinder upper half flange (6) and the cylinder lower half flange (7) are fixedly connected by a group of cylinder center face bolts (5).

5. The novel steam chamber structure of a steam turbine integrated with a cylinder according to claim 1 is characterized in that: The upper half (2) of the steam chamber and a group of upper partition ribs (3) are an integrally cast structure, and the lower half (4) of the steam chamber and a group of lower partition ribs (9) are an integrally cast structure, and each of the upper partition ribs (3) and each of the lower partition ribs (9) are respectively fixedly connected to the corresponding spring sheet (13).

6. The novel steam chamber structure of a steam turbine integrated with a cylinder according to claim 2 is characterized in that: Each of the lower partition ribs (9) is respectively provided with a partition rib groove (14), and each of the spring sheets (13) is respectively arranged in the corresponding partition rib groove (14).

7. The novel steam chamber structure of a steam turbine integrated with a cylinder according to claim 6 is characterized in that: Each screw (12) passes through the corresponding spring sheet (13) and is threadedly connected to the corresponding lower partition rib (9).

8. The novel steam chamber structure of a steam turbine integrated with a cylinder according to claim 7 is characterized in that: A group of the spring sheets (13) are opened toward the upper part (2) of the steam chamber, the lower part (4) of the steam chamber and the lower part (10) of the steam chamber.

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