CN210087408U

CN210087408U - Low-pressure inner cylinder of condensing steam turbine

Info

Publication number: CN210087408U
Application number: CN201920680036.7U
Authority: CN
Inventors: 李尚充; 丁伟涛; 张之柱
Original assignee: Zhejiang Kaicheng Machinery Co Ltd
Current assignee: Zhejiang Kaicheng Machinery Co Ltd
Priority date: 2019-05-13
Filing date: 2019-05-13
Publication date: 2020-02-18
Anticipated expiration: 2029-05-13

Abstract

The utility model discloses a condensing steam turbine low-pressure inner cylinder, which comprises an inner cylinder body, wherein a first hard alloy reinforced layer is fixedly arranged on the inner surface of the inner cylinder body, and a stainless steel layer is fixedly arranged on the inner surface of the first hard alloy reinforced layer; the fixed second carbide enhancement layer that is provided with on the surface of inner casing body, the cover is equipped with a plurality of groups on the surface of second carbide enhancement layer and strengthens the staple bolt device, and every group strengthens the staple bolt device and all includes left staple bolt and right staple bolt, the homogeneous body is provided with the polylith and strengthens the lug on the internal surface of left side staple bolt and right staple bolt, constitutes a heat dissipation chamber between two adjacent enhancement lugs, left side staple bolt and right staple bolt are aimed at every heat dissipation chamber position and all are provided with a heat dissipation through-hole at least. Above-mentioned technical scheme, structural design is reasonable, simple structure, it is easy to make, rigidity is good, install and remove easily, safe and reliable and long service life.

Description

Low-pressure inner cylinder of condensing steam turbine

Technical Field

The utility model relates to a steam turbine technical field, concretely relates to condensing steam turbine low pressure inner casing.

Background

With the continuous development of the design technology of the steam turbine, the 600MW grade unit becomes a conventional product. In order to save manufacturing and maintenance costs and save user space, the design of a single low-pressure cylinder has become a main pursuit target for various large steam turbine manufacturers to improve technical content and enhance competitiveness. However, after the double cylinders are changed into the single cylinder, the exhaust steam flow of the whole unit is not reduced, in order to achieve an ideal design effect and guarantee efficiency, the flow area of the low-pressure cylinder is inevitably increased, the length of the blades is increased, the axial and transverse spans of the low-pressure inner cylinder are increased, and the rigidity of the cylinder is reduced quickly along with the increase of the axial and transverse spans.

The low-pressure inner cylinder of the conventional steam turbine with the power of more than 300MW is of a cast-weld structure due to large volume, and the outside of the cylinder is formed by welding steel plates, so that the rigidity of the low-pressure inner cylinder is poor compared with that of a cast structure.

Because the rigidity of the cylinder is insufficient, when the vertical deflection of the cylinder reaches a certain degree, the installation is difficult, the dynamic and static clearances of the unit in operation are difficult to control in a reasonable range, and the safety of the unit is seriously influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a not enough to prior art exists, the utility model aims to provide a condensing steam turbine low pressure inner casing that structural design is reasonable, simple structure, make easily, rigidity is good, install and remove easily, safe and reliable and long service life.

In order to achieve the above purpose, the utility model provides a following technical scheme: a low-pressure inner cylinder of a condensing steam turbine comprises an inner cylinder body, wherein a first hard alloy reinforcing layer is fixedly arranged on the inner surface of the inner cylinder body, and a stainless steel layer is fixedly arranged on the inner surface of the first hard alloy reinforcing layer; the fixed second carbide enhancement layer that is provided with on the surface of inner casing body, the cover is equipped with a plurality of groups on the surface of second carbide enhancement layer and strengthens the staple bolt device, and every group strengthens the staple bolt device and all includes left staple bolt and right staple bolt, the homogeneous body is provided with the polylith and strengthens the lug on the internal surface of left side staple bolt and right staple bolt, constitutes a heat dissipation chamber between two adjacent enhancement lugs, left side staple bolt and right staple bolt are aimed at every heat dissipation chamber position and all are provided with a heat dissipation through-hole at least.

The utility model discloses further set up to: a first upper connecting plate is integrally arranged at the upper end of the left hoop, a second upper connecting plate is integrally arranged at the upper end of the right hoop, a first connecting bolt penetrates through the first upper connecting plate and the second upper connecting plate, and the first upper connecting plate and the second upper connecting plate are locked and fixed through the first connecting bolt.

The utility model discloses still further set up to: a positioning bottom plate is integrally arranged at the bottom of the inner cylinder body, and a rubber shock pad is fixedly bonded on the lower end face of the positioning bottom plate.

The utility model discloses still further set up to: a first lower connecting plate is integrally arranged at the lower end of the left hoop, a second lower connecting plate is integrally arranged at the lower end of the right hoop, a second connecting bolt is arranged at the left ends of the first lower connecting plate and the positioning bottom plate, and the first lower connecting plate and the left end of the positioning bottom plate are locked and fixed through the second connecting bolt; and the second lower connecting plate and the right end of the positioning bottom plate are locked and fixed through a third connecting bolt.

The utility model discloses still further set up to: the outer surfaces of the left anchor ear and the right anchor ear are aligned with the positions of the heat dissipation through holes and are fixedly provided with a dust cover.

The utility model discloses still further set up to: the left anchor ear and the right anchor ear are both made of metal materials or engineering plastic materials.

The utility model has the advantages that: compared with the prior art, the utility model has the advantages that the structure is more reasonable, the first hard alloy reinforced layer, the second hard alloy reinforced layer and the positioning bottom plate can increase the rigidity of the low-pressure inner cylinder, and the plurality of reinforced hoop devices are arranged outside the inner cylinder body, the quantity and the size of the reinforced hoop devices can be customized according to the axial and transverse span of the low-pressure inner cylinder, so that the rigidity of the inner cylinder is obviously increased, the safety of the operation of a steam turbine is ensured, in addition, the stainless steel layer can ensure that the inner part of the low-pressure inner cylinder is not easy to corrode, and the service life is prolonged; the whole condensing steam turbine low-pressure inner cylinder has the advantages of reasonable structural design, simple structure, easy manufacture, good rigidity, easy assembly and disassembly, safety, reliability, long service life and good practicability.

The invention is further described with reference to the drawings and the specific embodiments.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is an enlarged schematic view of a portion I in fig. 1.

Detailed Description

In the description of the present embodiment, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", etc. appear, the indicated orientation or positional relationship thereof is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1 and 2, the low-pressure inner cylinder of the condensing steam turbine disclosed by the utility model comprises an inner cylinder body 1, wherein a first hard alloy reinforcing layer 2 is fixedly arranged on the inner surface of the inner cylinder body 1, and a stainless steel layer 3 is fixedly arranged on the inner surface of the first hard alloy reinforcing layer 2; the fixed second carbide enhancement layer 4 that is provided with on the surface of inner tube body 1, the cover is equipped with a plurality of groups on the surface of second carbide enhancement layer 4 and strengthens staple bolt device 5, and every group is strengthened staple bolt device 5 and all is included left staple bolt 51 and right staple bolt 52, the homogeneous body is provided with polylith reinforcing convex block 53 on the internal surface of left staple bolt 51 and right staple bolt 52, constitutes a heat dissipation chamber 54 between two adjacent reinforcing convex blocks 53, left side staple bolt 51 and right staple bolt 52 aim at every heat dissipation chamber 54 position and all are provided with a radiating through hole 55 at least.

Preferably, the inner cylinder body 1, the first hard alloy reinforced layer 2, the stainless steel layer 3 and the second hard alloy reinforced layer 4 are integrally arranged or fixed by welding; the number of the reinforcing hoop devices 5 is at least one group, the number of the reinforcing lugs on the inner surfaces of the left hoop 51 and the right hoop 52 is more than three, and the reinforcing lugs play a role in reinforcing and increasing the rigidity by abutting against the outer surface of the second hard alloy reinforcing layer of the inner cylinder body.

For making the utility model discloses the structure sets up more rationally, as preferred, this embodiment a left side staple bolt 51 upper end an organic whole is provided with first upper junction plate 511, and right staple bolt 52 upper end an organic whole is provided with second upper junction plate 521, wear to be equipped with first connecting bolt 6 between first upper junction plate 511 and the second upper junction plate 521, first upper junction plate 511 and second upper junction plate 521 are fixed through first connecting bolt 6 locking.

A positioning bottom plate 11 is integrally arranged at the bottom of the inner cylinder body 1, and a rubber shock pad 7 is fixedly bonded on the lower end face of the positioning bottom plate 11.

A first lower connecting plate 512 is integrally arranged at the lower end of the left anchor ear 51, a second lower connecting plate 522 is integrally arranged at the lower end of the right anchor ear 52, a second connecting bolt 8 is arranged at the left ends of the first lower connecting plate 512 and the positioning bottom plate 11, and the first lower connecting plate 512 and the left end of the positioning bottom plate 11 are locked and fixed through the second connecting bolt 8; and a third connecting bolt 9 is arranged at the right end of the second lower connecting plate 522 and the right end of the positioning bottom plate 11, and the second lower connecting plate 522 and the right end of the positioning bottom plate 11 are locked and fixed through the third connecting bolt 9.

The outer surfaces of the left anchor ear 51 and the right anchor ear 52 are fixedly provided with a dust cover 10 at the position aligned with each heat dissipation through hole 55. Preferably, the dust cap 10 is welded or adhesively secured to the outer surface of the aligned left or

right ear

51, 52 by conventional adhesives. The dust cover 10 is an arc-shaped plate, and the dust cover 10 is made of stainless steel material or plastic material.

The left anchor ear 51 and the right anchor ear 52 are both made of metal materials or engineering plastic materials.

In practical application, the first hard alloy reinforcing layer, the second hard alloy reinforcing layer and the positioning bottom plate can increase the rigidity of the low-pressure inner cylinder, and a plurality of reinforcing hoop devices are arranged outside the inner cylinder body, and the number and the size of the reinforcing hoop devices can be customized according to the axial and transverse span of the low-pressure inner cylinder, so that the rigidity of the inner cylinder is obviously increased, the safety of the operation of a steam turbine is ensured, in addition, the stainless steel layer can enable the interior of the low-pressure inner cylinder not to be easily corroded, and the service life is prolonged; the whole condensing steam turbine low-pressure inner cylinder has the advantages of reasonable structural design, simple structure, easy manufacture, good rigidity, easy assembly and disassembly, safety, reliability, long service life and good practicability.

The above embodiments are only used for further explanation of the present invention, and it is not understood that the present invention is limited by the protection scope of the present invention, and the technical engineers in the field are right according to the above contents of the present invention.

Claims

1. The utility model provides a condensing steam turbine low pressure inner casing, includes inner casing body (1), its characterized in that: a first hard alloy reinforcing layer (2) is fixedly arranged on the inner surface of the inner cylinder body (1), and a stainless steel layer (3) is fixedly arranged on the inner surface of the first hard alloy reinforcing layer (2); the fixed second carbide reinforced layer (4) that is provided with on the surface of inner casing body (1), the cover is equipped with a plurality of groups on the surface of second carbide reinforced layer (4) and strengthens staple bolt device (5), and every group is strengthened staple bolt device (5) and all is included left staple bolt (51) and right staple bolt (52), the homogeneous body is provided with polylith on the internal surface of left side staple bolt (51) and right staple bolt (52) and strengthens lug (53), constitutes one heat dissipation chamber (54) between adjacent two blocks of enhancement lugs (53), left side staple bolt (51) and right staple bolt (52) aim at every heat dissipation chamber (54) position and all are provided with one heat dissipation through-hole (55) at least.

2. The condensing steam turbine low pressure inner casing according to claim 1, wherein: the upper end of the left hoop (51) is integrally provided with a first upper connecting plate (511), the upper end of the right hoop (52) is integrally provided with a second upper connecting plate (521), a first connecting bolt (6) penetrates between the first upper connecting plate (511) and the second upper connecting plate (521), and the first upper connecting plate (511) and the second upper connecting plate (521) are locked and fixed through the first connecting bolt (6).

3. The condensing steam turbine low pressure inner casing according to claim 2, wherein: the inner cylinder is characterized in that a positioning bottom plate (11) is integrally arranged at the bottom of the inner cylinder body (1), and a rubber shock pad (7) is fixedly bonded on the lower end face of the positioning bottom plate (11).

4. The condensing steam turbine low pressure inner casing according to claim 3, wherein: a first lower connecting plate (512) is integrally arranged at the lower end of the left hoop (51), a second lower connecting plate (522) is integrally arranged at the lower end of the right hoop (52), a second connecting bolt (8) is arranged at the left ends of the first lower connecting plate (512) and the positioning bottom plate (11), and the first lower connecting plate (512) and the left end of the positioning bottom plate (11) are locked and fixed through the second connecting bolt (8); and the second lower connecting plate (522) and the right end of the positioning bottom plate (11) are provided with a third connecting bolt (9), and the second lower connecting plate (522) and the right end of the positioning bottom plate (11) are locked and fixed through the third connecting bolt (9).

5. The condensing steam turbine low pressure inner casing according to claim 4, wherein: and the outer surfaces of the left hoop (51) and the right hoop (52) are aligned with the positions of the heat dissipation through holes (55) and are fixedly provided with a dust cover (10).

6. The condensing steam turbine low pressure inner casing according to claim 5, wherein: the left anchor ear (51) and the right anchor ear (52) are both made of metal materials or engineering plastic materials.