CN217538804U

CN217538804U - Support structure of back pressure steam turbine nozzle chamber and inner cylinder

Info

Publication number: CN217538804U
Application number: CN202221783770.4U
Authority: CN
Inventors: 张泰然; 王文婷; 王超; 姚福锋; 李雨薇; 韦俊
Original assignee: Grand New Power Co ltd
Current assignee: Grand New Power Co ltd
Priority date: 2022-07-11
Filing date: 2022-07-11
Publication date: 2022-10-04
Anticipated expiration: 2032-07-11

Abstract

The utility model provides a bearing structure of backpressure steam turbine nozzle room and interior cylinder, nozzle room and interior cylinder welding are in outer cylinder bottom, be axial, circumference location to nozzle room and interior cylinder through outer cylinder, circumference location structure adopts the spacer pin board welding on outer cylinder, and circumference location is accomplished with interior cylinder to clearing hole and nozzle room, and the axial positioning structure passes through hexagon socket head cap screw in the cylinder head, the adjustment bush, the anterior axial positioning of cylinder and nozzle room and interior cylinder mid-plane of dividing. The utility model discloses satisfy high temperature, back pressure formula high power density industrial steam turbine cylinder location and support compactification demand.

Description

Support structure of back pressure steam turbine nozzle chamber and inner cylinder

Technical Field

The utility model belongs to energy power industry specifically realizes high temperature, back pressure type industrial steam turbine outer cylinder and nozzle chamber and interior cylinder installation location through the novel support mode of nozzle chamber and interior cylinder. The method has the characteristics of compact rhythm, quick installation and convenient processing.

Background

The back pressure type high rotation speed industrial steam turbine has high temperature characteristic, and the cylinder structure is divided into outer cylinder, nozzle chamber and inner cylinder, the nozzle chamber is cast integrally and fixed to the inner cylinder via peripheral screw bolt before being installed in the front of the outer cylinder, and the inner cylinder is installed in the back of the outer cylinder. The original high back pressure support structure only supports the nozzle chamber for the outer cylinder. Considering that the axial length of a cylinder in the novel back pressure unit is lengthened, the original supporting mode is not enough to ensure the stable operation of the unit. The outer cylinder support, positioning of the nozzle chamber and inner cylinder, and thermal expansion during operation are critical to this type of structural design. The research content of improvement and optimization is needed to better satisfy the requirement that the compact structure of the high back pressure steam turbine lightens the weight of the body and simplifies the supporting structure mode of the inner cylinder and the outer cylinder of the steam turbine.

SUMMERY OF THE UTILITY MODEL

The utility model aims at designing a bearing structure of high power density backpressure steam turbine nozzle room and interior cylinder, satisfying steam turbine nozzle room and interior cylinder location requirement, simplifying outer cylinder to nozzle room and interior cylinder bearing structure.

The purpose of the utility model is realized like this: the nozzle chamber and the inner cylinder are welded at the bottom of the outer cylinder, the nozzle chamber and the inner cylinder are axially and circumferentially positioned through the outer cylinder, the circumferential positioning structure is welded on the outer cylinder by adopting a positioning pin plate, the circumferential positioning is completed through the hole, the nozzle chamber and the inner cylinder, and the axial positioning structure axially positions the outer cylinder, the nozzle chamber and the front part of the split surface of the inner cylinder through a cylindrical head hexagon socket screw, an adjusting bush and a gasket.

The utility model discloses still include some such structural feature:

1. and a positioning key plate connected with the nozzle chamber and the inside cylinder.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses at outer cylinder front, respectively design two sets of lugs at the rear portion, along axis bilateral symmetry, support nozzle chamber and preceding, rear portion of interior cylinder. Ensuring the even stress. The stable operation of the turbine under the condition of thermal expansion is ensured by arranging the clearance between the inner cylinder and the outer cylinder. The positioning size can be rapidly adjusted through the grinding gap. The utility model discloses satisfy high temperature, back pressure formula high power density industrial steam turbine cylinder location and support compactification demand.

Drawings

FIGS. 1a and 1b are both schematic support views;

FIG. 2 is a view showing the structure of a support washer, an adjustment cushion cover, and a socket head cap screw;

FIG. 3 is a view of the spacer.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

With reference to fig. 1a to 3, the outer cylinder is oriented primarily axially and circumferentially with respect to the nozzle chamber and the inner cylinder. The positioning and supporting fully considers the requirements of uniform stress and thermal expansion. Because the axial dimension of the inner cylinder is lengthened, two groups of lugs are required to be added at the rear part of the outer cylinder along the axial direction to be used as supports in order to avoid the occurrence of cantilever beam conditions. The requirements of uniform stress and thermal expansion need to be considered when positioning and supporting. The circumferential positioning structure is welded on the outer cylinder by adopting a positioning pin plate, and the circumferential positioning is completed through the hole, the nozzle chamber and the inner cylinder.

The axial positioning structure axially positions the front parts of the middle split surfaces of the outer cylinder, the nozzle chamber and the inner cylinder through a cylindrical head inner hexagon screw, an adjusting bush and a gasket. The height of the grinding and adjusting bushing ensures the gap between the top of the bushing and the middle facet of the nozzle chamber. And a positioning key plate structure is designed, the nozzle chamber falls into the lower half of the outer cylinder, and the contact area of the nozzle chamber and the outer cylinder is ensured after the positioning key plate is registered with the total gaps on the two sides of the nozzle chamber. The rear axial support adopts the same structure, and an adjusting gasket is added. The front and the rear are supported on the same bisection plane by correcting the thickness of the support. The stress can be judged to be uniform.

And (3) designing a positioning pin plate 3 structural part by combining with the figures 1a and 1b, and welding the structural part and the nozzle chamber and inner cylinder 2 assembly at the bottom of an outer cylinder of the part 1 after the circumferential adjustment of a phi 38 hole during final assembly so as to ensure circumferential positioning. And simultaneously, the gap between the positioning pin plate and the nozzle chamber is ensured to ensure sufficient expansion.

Referring to fig. 1a and 2, a socket head cap screw 7, an adjusting bush 6, and a gasket structure 5 are provided to be combined at both sides of a central plane of a front portion of the outer cylinder 1 for supporting the nozzle chamber and the inner cylinder 2. The height of the lining is adjusted by an adjusting cushion cover (a coping piece) 6 to ensure the clearance between the top of the lining and the median plane of the nozzle chamber. And designing a positioning key plate 4 structure, enabling the nozzle chamber to fall into the lower half of the outer cylinder, after the positioning key plate is registered with the total gaps on the two sides of the nozzle chamber, ensuring that the clearance gauge with the contact area of the outer cylinder is larger than 50% and 0.1mm cannot enter, and welding and fixing after the clearance gauge is checked to be qualified. The axial positioning of the outer cylinder and the nozzle chamber is ensured.

With reference to fig. 1 a-3, because the inner cylinder is lengthened in axial dimension, the lugs are arranged at the same axial position, and the same socket head cap screws 7, the adjusting bush 6 and the gasket structure 5 are combined at two sides of the rear part surface of the outer cylinder for supporting and positioning the inner cylinder. In order to ensure uniform stress and the same expansion amount clearance, an adjusting gasket 8 is designed to ensure that corresponding adjusting allowance is kept, so that the front and rear supports of the outer cylinder to the nozzle chamber and the inner cylinder 2 are all on the split surface.

The utility model discloses a bearing structure realization process of high power density backpressure steam turbine nozzle room and interior cylinder:

1. analyzing the supporting and positioning requirements of the outer cylinder on the nozzle chamber and the inner cylinder;

2. the structure which is simple in design and connection with the cylinder, convenient to adjust and process and convenient to install meets the requirements of axial positioning and circumferential positioning among cylinders, integration optimization is carried out, and the overall structure is confirmed;

3. designing a circumferential supporting structure of the outer cylinder to the nozzle chamber and the inner cylinder;

4. and designing an axial supporting structure of the outer cylinder to the nozzle chamber and the inner cylinder.

The utility model relates to a bearing structure of reliable and stable, high power density backpressure steam turbine nozzle room and interior cylinder. By designing the structures such as the socket head cap screws, the adjusting bushes, the gaskets, the positioning pin plates and the like, the front and back axial and circumferential support of the inner cylinder and the nozzle chamber is realized, and the stress is more uniform. And meanwhile, a reasonable gap is arranged, so that the stable operation of the steam turbine due to thermal expansion is ensured. The requirements of high temperature and back pressure type high power density industrial steam turbine cylinder positioning and support compactness are met, and good maintainability and reliability are achieved.

The utility model discloses the main points:

1. novel integral support structure of high power density backpressure steam turbine.

2. Novel circumferential support structure of high power density backpressure steam turbine.

3. Novel axial bearing structure of high power density backpressure steam turbine.

4. The gap between the inner cylinder and the outer cylinder is arranged to ensure the stable operation of the steam turbine due to thermal expansion, and the positioning size can be quickly adjusted by grinding the gap.

Claims

1. The utility model provides a bearing structure of backpressure steam turbine nozzle chamber and interior cylinder which characterized in that: the nozzle chamber and the inner cylinder are welded at the bottom of the outer cylinder, the nozzle chamber and the inner cylinder are axially and circumferentially positioned through the outer cylinder, the circumferential positioning structure is welded on the outer cylinder by adopting a positioning pin plate, the circumferential positioning is completed through the hole, the nozzle chamber and the inner cylinder, and the axial positioning structure axially positions the front parts of the midportion of the outer cylinder, the nozzle chamber and the inner cylinder through a cylindrical head hexagon socket head screw, an adjusting bush and a gasket.

2. The support structure for the nozzle chamber and the inner cylinder of the back pressure turbine according to claim 1, wherein: and a positioning key plate connected with the nozzle chamber and the inside cylinder.