CN219241997U

CN219241997U - Pressure sampling device for inner and outer spacers of steam turbine

Info

Publication number: CN219241997U
Application number: CN202320248959.1U
Authority: CN
Inventors: 颜绍霖; 杨光茂; 颜江叡; 吴昌新; 徐淋
Original assignee: Guizhou Xidian Power Co ltd Qianbei Power Plant
Current assignee: Guizhou Xidian Power Co ltd Qianbei Power Plant
Priority date: 2023-02-17
Filing date: 2023-02-17
Publication date: 2023-06-23
Anticipated expiration: 2033-02-17

Abstract

The utility model discloses a pressure sampling device for an inner spacer bush and an outer spacer bush of a steam turbine. The pressure sampling device comprises a pressure sampling tube and a fixing assembly, wherein the pressure sampling tube comprises a plurality of straight tube sections and bent tube sections which are integrally formed, one section of the straight tube sections is used for penetrating through a penetrating hole of an outer cylinder wall, the fixing assembly is used for fixing the straight tube sections on the outer cylinder wall and sealing the penetrating hole, a pressure sampling end of the pressure sampling tube is used for being fixed on an inner cylinder wall, and at least one section of the bent tube sections is arranged on the part of the pressure sampling tube, which is located between the outer cylinder wall and the inner cylinder wall. The pressure sampling tube is arranged into the form of the straight tube section and the bent tube section, so that the pressure sampling tube has certain extensibility, when the expansion or contraction degree of the inner cylinder and the outer cylinder is inconsistent, the stress change is overcome through the bent tube section, the joint of the pressure sampling tube and the outer cylinder wall is prevented from being pulled apart, and steam leakage is prevented.

Description

Pressure sampling device for inner and outer spacers of steam turbine

Technical Field

The utility model belongs to the technical field of steam turbine equipment, and particularly relates to a pressure sampling device for an inner spacer bush and an outer spacer bush of a steam turbine.

Background

The in-situ used pressure sampling system of the regulating stage in the steam turbine has the following problems: the pressure guiding pipe for taking pressure is used for guiding pressure from the inner cylinder of the steam turbine to the inner side of the outer cylinder in a welding mode, the pipe section between the inner cylinder and the outer cylinder is a straight pipe, and the length of expansion and contraction is insufficient, so that the welded part of the pipe is easily pulled and cracked due to inconsistent expansion or contraction length in the start-stop process of the unit, and steam leakage is caused. The pipeline transition device for connecting the outer cylinder adopts a flange plate installation and inner side welding mode, the process is complex, the inner construction space is narrow, the inner cylinder is required to be in a hoisting state for welding installation, and the safety risk violating regulations exists.

Disclosure of Invention

The utility model solves the technical problems that: and (3) when the pressure of the steam turbine is sampled, the expansion or contraction is avoided to cause the stretch-cracking of the pipeline welding part so as to prevent steam leakage.

The application discloses a pressure sampling device for inside and outside spacer bush of steam turbine, pressure sampling device includes pressure sampling tube and fixed subassembly, pressure sampling tube includes integrated into one piece's a plurality of straight tube sections and curved tube section, one of them section the straight tube section is used for passing the hole of wearing out of outer cylinder wall, fixed subassembly is used for with the straight tube section is fixed on the outer cylinder wall and is used for sealing the hole of wearing out, pressure sampling tube's pressure-taking end is used for fixing on the inner cylinder wall, wherein pressure sampling tube is located outer cylinder wall with the part between the inner cylinder wall has one section at least the curved tube section.

Preferably, the portion of the pressure sampling tube located outside the outer cylinder wall has at least one section of the bend section.

Preferably, the shape of the bend section is U-shaped.

Preferably, the fixing component comprises a sealing seat, a sealing reed and a nut which are coaxially arranged, the sealing seat is provided with a through hole, the sealing seat is used for being fixed on the outer surface of the outer cylinder wall, the straight pipe section sequentially penetrates through the sealing seat, the sealing reed and the nut, the nut is in threaded connection with the outer surface of the sealing seat so that the sealing reed is clamped between the nut and the sealing seat, and the sealing reed is used for sealing the through hole.

Preferably, a concave part is arranged on the surface of the sealing seat facing the sealing reed, and the part of the sealing reed is positioned in the concave part.

Preferably, a circle of annular limiting part is arranged in the nut, and the annular limiting part is abutted with the end face of the sealing reed.

Preferably, the outer surface of the pressure taking end is provided with a threaded part.

Compared with the prior art, the pressure sampling device for the inner and outer spacers of the steam turbine has the following technical effects:

the pressure sampling tube is arranged into the form of the straight tube section and the bent tube section, so that the pressure sampling tube has certain extensibility, when the expansion or contraction degree of the inner cylinder and the outer cylinder is inconsistent, the stress change is overcome through the bent tube section, the joint of the pressure sampling tube and the outer cylinder wall is prevented from being pulled apart, and steam leakage is prevented. Meanwhile, the fixing mode of the fixing assembly is adopted, the installation is simpler and more convenient, and the adoption of a welding fixing mode is avoided.

Drawings

FIG. 1 is a view showing a state of use of a pressure sampling apparatus for an inner and outer spacer of a steam turbine according to an embodiment of the present utility model;

FIG. 2 is a schematic view showing a partial structure of a pressure sampling apparatus for an inner and outer spacer of a steam turbine according to an embodiment of the present utility model.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Before describing in detail the various embodiments of the present application, the technical concepts of the present application are first briefly described: in the existing pressure sampling system of the internal regulation stage of the steam turbine, the connecting pipe section of the sampling pipe between the internal cylinder and the external cylinder is usually a straight pipe section, and the sampling pipe is fixed on the cylinder wall in a welding mode, so that when the expansion and the contraction of the internal cylinder and the external cylinder are inconsistent, the welded part is easily pulled apart, thereby causing steam leakage. Therefore, in the pressure sampling device for the inner and outer spacers of the steam turbine, the pressure sampling tube is composed of the straight tube section and the bent tube section, the straight tube section is penetrated on the outer cylinder wall and then fixed by the fixing assembly, the perforated part is sealed, the bent tube section is used for buffering the inner cylinder and the outer cylinder when expanding or contracting, even if the expansion degree of the inner cylinder and the outer cylinder is inconsistent, the bent tube section also has enough reaction length, and the situation that too large pulling force is generated at the sealed part to form pulling crack is avoided, so that steam is prevented from leaking.

Specifically, as shown in fig. 1 and 2, the pressure sampling device for the inner and outer spacers of the steam turbine comprises a pressure sampling tube 10 and a fixing assembly 20, wherein the pressure sampling tube 10 comprises a plurality of straight tube sections 11 and bent tube sections 12 which are integrally formed, one straight tube section 11 is used for penetrating through a penetrating hole 31 of an outer cylinder wall 30, the fixing assembly 20 is used for fixing the straight tube section 11 on the outer cylinder wall 30 and sealing the penetrating hole 31, the pressure sampling tube 10 is used for being fixed on an inner cylinder wall 40, and at least one bent tube section 12 is arranged on the part of the pressure sampling tube 10 between the outer cylinder wall 30 and the inner cylinder wall 40.

Further, the portion of the pressure sampling tube 10 located outside the outer cylinder wall 30 has at least one bend section 12. The number of bend sections 12 may be plural as desired. Illustratively, the bend section 12 is U-shaped in shape.

Further, the fixing assembly 20 includes a sealing seat 21, a sealing reed 22 and a nut 23 coaxially disposed, the sealing seat 21 has a through hole 210 and the sealing seat 21 is used for being fixed on an outer surface of the outer cylinder wall 30, the straight pipe section 11 sequentially passes through the sealing seat 21, the sealing reed 22 and the nut 23, the nut 23 is in threaded connection with the outer surface of the sealing seat 21 so that the sealing reed 22 is clamped between the nut 23 and the sealing seat 21, and the sealing reed 22 is used for sealing the through hole 210. The pressure sampling tube 10 is fixed by adopting the fixing assembly 20, welding on the outer cylinder wall 30 is not needed, and construction inconvenience and construction risk caused by narrow space are avoided.

Illustratively, the seal seat 21 is fixed to the outer surface of the outer cylinder wall 30 by welding and surrounds the outer edge of the through hole 31, and the through hole 210 is opposite to the through hole 31, and the outer surface of the seal seat 21 has threads. The outer diameter of the sealing reed 22 is smaller than the outer diameter of the sealing seat 21 but larger than the diameter of the through hole 210, and the inner diameter of the sealing reed 22 is smaller than the diameter of the through hole 210, and the inner diameter of the sealing reed 22 is equal to the outer diameter of the straight pipe section 11, so that when the sealing reed 22 abuts against the sealing seat 21, the through hole 210 is sealed by the sealing reed 22, thereby achieving the effect of sealing the through hole 31 and preventing steam leakage.

Further, the sealing seat 21 has a recess 211 on a surface facing the sealing reed 22, and a portion of the sealing reed 22 is located in the recess 211. The recess 211 can limit the sealing seat 21 in the radial direction, so as to keep the sealing seat 21 and the sealing reed 22 relatively stable.

Further, a ring-shaped limiting part 231 is arranged in the nut 23, and the ring-shaped limiting part 231 is abutted against the end face of the sealing reed 22. When the nut 23 is screwed with the outer surface of the seal seat 21, the seal reed 22 is sandwiched between the annular limiting portion 231 and the recessed portion 211 and is kept stable. Illustratively, both side end surfaces of the sealing reed 22 may be tapered to facilitate the cooperation of the sealing reed 22 with the nut 23 and the sealing seat 21. The nut 23 is illustratively a hex nut.

Further, the outer surface of the pressure taking end 13 is provided with a threaded portion, and after the pressure taking end 13 is in threaded connection with the inner cylinder wall 40, the pressure taking end 13 is welded and fixed, so that the pressure taking end 13 and the inner cylinder wall 40 can be stably connected.

According to the pressure sampling device for the inner and outer spacers of the steam turbine, disclosed by the embodiment, the pressure sampling pipe is arranged into the form of the straight pipe section and the bent pipe section, so that the pressure sampling pipe has certain extensibility, when the expansion or contraction degree of the inner cylinder and the outer cylinder is inconsistent, the stress change is overcome through the bent pipe section, the connection part of the pressure sampling pipe and the outer cylinder wall is prevented from being pulled apart, and steam leakage is prevented. Meanwhile, the fixing mode of the fixing assembly is adopted, the installation is simpler and more convenient, and the adoption of a welding fixing mode is avoided.

While certain embodiments have been shown and described, it would be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles and spirit of the utility model, the scope of which is defined in the claims and their equivalents.

Claims

1. The utility model provides a pressure sampling device for inside and outside spacer bush of steam turbine, its characterized in that, pressure sampling device includes pressure sampling tube and fixed subassembly, the pressure sampling tube includes integrated into one piece's a plurality of straight tube sections and curved tube section, one of them the straight tube section is used for passing the hole that wears out of outer cylinder wall, fixed subassembly is used for with the straight tube section is fixed on the outer cylinder wall and is used for sealing the hole that wears out, the pressure sampling tube's the pressure end is used for fixing on the inner cylinder wall, wherein the pressure sampling tube is located the part between outer cylinder wall and the inner cylinder wall has one section at least the curved tube section.

2. The pressure sampling device for steam turbine inner and outer spacers as claimed in claim 1, wherein the portion of the pressure sampling tube located outside the outer cylinder wall has at least one section of the curved tube section.

3. A pressure sampling apparatus for an inner and outer spacer of a steam turbine according to claim 1 or 2, wherein the curved pipe section is U-shaped.

4. The pressure sampling device for an inner and outer spacer bush of a steam turbine according to claim 1, wherein the fixing assembly comprises a sealing seat, a sealing reed and a nut coaxially arranged, the sealing seat is provided with a through hole and is used for being fixed on the outer surface of the outer cylinder wall, the straight pipe section sequentially penetrates through the sealing seat, the sealing reed and the nut, the nut is in threaded connection with the outer surface of the sealing seat so that the sealing reed is clamped between the nut and the sealing seat, and the sealing reed is used for sealing the through hole.

5. The pressure sampling device for steam turbine inner and outer spacers as claimed in claim 4, wherein the sealing seat has a recess on a surface facing the sealing reed, and a portion of the sealing reed is located in the recess.

6. The pressure sampling device for an inner spacer bush and an outer spacer bush of a steam turbine according to claim 5, wherein a circle of annular limiting portion is arranged in the nut, and the annular limiting portion abuts against the end face of the sealing reed.

7. The pressure sampling device for steam turbine inner and outer spacers of claim 5, wherein the outer surface of the pressure tapping end has a threaded portion.