CN108533333B - Steam turbine cannula sealing device and use method thereof - Google Patents
Steam turbine cannula sealing device and use method thereof Download PDFInfo
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- CN108533333B CN108533333B CN201810422579.9A CN201810422579A CN108533333B CN 108533333 B CN108533333 B CN 108533333B CN 201810422579 A CN201810422579 A CN 201810422579A CN 108533333 B CN108533333 B CN 108533333B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/005—Sealing means between non relatively rotating elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/003—Preventing or minimising internal leakage of working-fluid, e.g. between stages by packing rings; Mechanical seals
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Abstract
The steam turbine insertion pipe sealing device comprises an outer ring, an inner ring, an outer ring C-shaped ring and an inner ring C-shaped ring, wherein the outer ring and the inner ring are coaxially abutted along the axis of the inner ring, an outer ring C-shaped ring accommodating groove is formed in the outer diameter surface of the outer ring, an inner ring C-shaped ring accommodating groove is formed in the inner diameter surface of the inner ring, the outer ring C-shaped ring is arranged in the outer ring C-shaped ring accommodating groove, and the inner ring C-shaped ring is arranged in the inner ring C-shaped ring accommodating groove; the outer ring C-shaped ring is in butt joint with a high-pressure inner cylinder of the steam turbine, and the inner ring C-shaped ring is in butt joint with an air inlet insertion pipe of the steam turbine. The steam turbine inserted pipe sealing device creatively passes through the inner ring and the outer ring C-shaped ring, realizes the sealing in the axial direction and the end face direction by utilizing the excellent rebound resilience of the C-shaped ring, and compensates the contact surface separation phenomenon caused by the temperature reduction by utilizing the rebound resilience of the C-shaped ring when the temperature is reduced, so that the whole sealing device forms reliable sealing during the running period of equipment.
Description
Technical Field
The invention relates to the technical field of turbine sealing, in particular to a turbine cannula sealing device and a using method thereof.
Background
In high-parameter high-power turbine units, a multi-layer cylinder structure is generally adopted in a high-pressure part, steam needs to pass through independent components such as an outer cylinder, an inner cylinder and the like before entering a ventilation part, and the temperature difference between the outer cylinder and the inner cylinder is large under the working condition, so that the two cylinders have large difference expansion. In general, the steam inlet part adopts a steam inlet insertion pipe structure, one end of the steam inlet part is welded with the outer cylinder into a whole, and the other end of the steam inlet part needs to relatively move due to temperature difference change. The sealing part belongs to dynamic sealing under the working conditions of high pressure and high temperature, and a sealing structure is arranged in the sealing part in order to avoid steam leakage in the operation process.
Most of the existing steam turbine inserted pipes are of piston ring type sealing structures, bell-type cover type sealing structures or lamination type sealing structures, however, the three structures cannot avoid the steam leakage of the inserted pipes, and the steam inlet efficiency and cylinder efficiency of the inserted pipes are guaranteed. For example, chinese patent publication No. CN 2825960Y, entitled steam leakage prevention stacked sealing device for high-pressure inner and outer cylinders of steam turbine, which is a stacked sealing structure, features of convenient installation and self-resetting stability of the sealing device are achieved through structures of sealing rings, backing rings, wave springs and guiding backing rings, the sealing structure is shown in fig. 1, however, the sealing effect of the sealing rings at the end surfaces of the stacked connection positions and the sealing rings at the positions of the sealing rings and the high-pressure inner cylinders is still poor, for example, 4 leakage channels are formed at the positions of the backing rings and the high-pressure inner cylinders, the positions of the backing rings and the backing rings, and the positions of the backing rings and the sealing rings, and the specific leakage channels are shown in fig. 2 due to the structure of the stacked sealing device in the working state; in FIG. 1-2, 1-1 is a flange, 13 is a steam inlet pipe, 12 is a high-pressure inner cylinder, 1-2 is an L-shaped backing ring, 1-3 is a sealing ring, and 1-4 is a T-shaped backing ring.
Disclosure of Invention
The technical solution of the invention is as follows: overcomes the defects of the prior art, provides a steam turbine cannula sealing device and a using method thereof, and avoids the leakage problem in the existing sealing structure.
The technical scheme of the invention is as follows:
the steam turbine insertion pipe sealing device comprises an outer ring, an inner ring, an outer ring C-shaped ring and an inner ring C-shaped ring, wherein the outer ring and the inner ring are coaxially abutted along the axis of the inner ring, an outer ring C-shaped ring accommodating groove is formed in the outer diameter surface of the outer ring, an inner ring C-shaped ring accommodating groove is formed in the inner diameter surface of the inner ring, the outer ring C-shaped ring is arranged in the outer ring C-shaped ring accommodating groove, and the inner ring C-shaped ring is arranged in the inner ring C-shaped ring accommodating groove; the outer ring C-shaped ring is in butt joint with a high-pressure inner cylinder of the steam turbine, and the inner ring C-shaped ring is in butt joint with an air inlet insertion pipe of the steam turbine.
Further, the outer ring comprises an outer ring pre-tightening screw, an outer ring main framework, an outer ring graphite ring and an outer ring auxiliary framework; the inner diameter and the outer diameter of the outer ring main framework and the outer ring auxiliary framework are the same, and the lower surface of the outer ring main framework is contacted with the upper surface of the outer ring auxiliary framework and is coaxially and fixedly connected through an outer ring pre-tightening screw; the outer ring main framework outer diameter surface is provided with outer ring C type circle location step, and outer ring C type circle location step and outer ring assist the skeleton upper surface and constitute outer ring C type circle holding tank, and outer ring assists the skeleton upper surface and is provided with outer ring seal groove, and outer ring graphite ring is in outer ring seal groove.
Further, in a free state, the outer diameter of the outer ring C-shaped ring is the same as the outer diameters of the outer ring main framework and the outer ring auxiliary framework, after the outer ring pre-tightening screw is pre-tightened, the outer diameter of the outer ring C-shaped ring is larger than the outer diameters of the outer ring main framework and the outer ring auxiliary framework, and the outer ring C-shaped ring cannot move in the outer ring C-shaped ring accommodating groove along the axial direction of the outer ring.
Further, the number of the outer ring graphite rings is 2, and in the radial direction of the outer ring, the 2 outer ring graphite rings are respectively positioned at the inner side and the outer side of the outer ring pre-tightening screw.
Further, the inner ring comprises an inner ring graphite ring, an inner ring main framework, an inner ring auxiliary framework and an inner ring pre-tightening screw; the inner diameter and the outer diameter of the inner ring main framework and the inner ring auxiliary framework are the same, and the lower surface of the inner ring main framework is contacted with the upper surface of the inner ring auxiliary framework and is coaxially and fixedly connected through an inner ring pre-tightening screw; the inner diameter surface of the inner ring main framework is provided with an inner ring C-shaped ring positioning step, the inner ring C-shaped ring positioning step and the upper surface of the inner ring auxiliary framework form an inner ring C-shaped ring accommodating groove, the upper surfaces of the inner ring main framework and the inner ring auxiliary framework are provided with inner ring sealing grooves, and the inner ring graphite rings are arranged in the inner ring sealing grooves and are in butt joint with the outer ring.
Further, in a free state, the inner diameter of the inner ring C-shaped ring is smaller than the inner diameters of the inner ring main framework and the inner ring auxiliary framework, and after the inner ring pre-tightening screw is pre-tightened, the inner ring C-shaped ring can move in the inner ring C-shaped ring accommodating groove along the axial direction of the inner ring.
Further, the number of the inner ring graphite rings is 3, 2 inner ring sealing grooves are formed in the upper surface of the inner ring auxiliary framework, 2 inner ring graphite rings in the 3 inner ring graphite rings are arranged in the 2 inner ring sealing grooves on the inner ring auxiliary framework, and the 2 inner ring graphite rings are respectively positioned at the inner side and the outer side of the inner ring pre-tightening screw in the radial direction of the inner ring; the upper surface of the inner ring main framework is provided with 1 inner ring sealing groove, 1 inner ring graphite ring in 3 inner ring graphite rings is arranged in the inner ring sealing groove on the inner ring main framework, and in the radial direction of the inner ring, 1 inner ring graphite ring is arranged outside the inner ring pre-tightening screw.
The application method of the steam turbine cannula sealing device comprises the following steps:
s1), placing an inner ring on a concave surface of a high-pressure inner cylinder of a steam turbine, wherein an inner ring C-shaped ring accommodating groove is formed in the inner diameter surface of the inner ring, and the inner ring C-shaped ring is arranged in the inner ring C-shaped ring accommodating groove;
s2), coaxially placing the outer ring and the inner ring on the upper surface of the inner ring, wherein an outer ring C-shaped ring accommodating groove is formed in the outer diameter surface of the outer ring, the outer ring C-shaped ring is arranged in the outer ring C-shaped ring accommodating groove, and the outer ring C-shaped ring is abutted with a high-pressure inner cylinder of the steam turbine;
s3), mounting a limiting flange on the upper surface of the outer ring, and positioning the inner ring and the outer ring in the axial direction of the inner ring by the limiting flange;
s4), inserting an air inlet insertion pipe of the steam turbine along the central through holes of the inner ring and the outer ring, and abutting the C-shaped ring of the inner ring with the outer surface of the air inlet insertion pipe.
Further, before step S1), the inner ring is assembled, which includes the steps of:
s01), mounting an inner ring graphite ring: respectively placing an inner ring graphite ring in an inner ring sealing groove on the upper surfaces of the inner ring main framework and the inner ring auxiliary framework;
s02), mounting an inner ring C-shaped ring: an inner ring C-shaped ring is arranged on an inner ring C-shaped ring positioning step arranged on the inner diameter surface of the inner ring main framework;
s03) assembling the inner ring main framework and the inner ring auxiliary framework, abutting the lower surface of the inner ring main framework with the upper surface of the inner ring auxiliary framework, enabling the inner diameter of the inner ring C-shaped ring to be smaller than the inner diameters of the inner ring main framework and the inner ring auxiliary framework, and pre-tightening by using an inner ring pre-tightening screw, wherein at the moment, the inner ring C-shaped ring can move in the inner ring C-shaped ring accommodating groove along the axial direction of the inner ring.
Further, step S2) includes the steps of:
s21), mounting an outer ring graphite ring: an outer ring graphite ring is placed in an outer ring sealing groove on the upper surface of the outer ring auxiliary framework;
s22), mounting an outer ring C-shaped ring: an outer ring C-shaped ring is arranged on an outer ring C-shaped ring positioning step arranged on the outer diameter surface of the outer ring main framework;
s23), assembling an outer ring main skeleton and an outer ring auxiliary skeleton: the lower surface of the outer ring main framework is abutted with the upper surface of the outer ring auxiliary framework and connected by using outer ring pre-tightening screws, and at the moment, the outer diameter of the outer ring C-shaped ring is the same as the outer diameters of the outer ring main framework and the outer ring auxiliary framework;
s24), pre-tightening the outer ring main skeleton and the outer ring auxiliary skeleton: the outer ring and the inner ring are coaxially placed on the inner ring, the outer ring pre-tightening screw is pre-tightened, so that the outer ring C-shaped ring is abutted with the high-pressure inner cylinder of the steam turbine, at the moment, the outer diameter of the outer ring C-shaped ring is larger than the outer diameters of the outer ring main framework and the outer ring auxiliary framework, and the outer ring C-shaped ring cannot move in the outer ring C-shaped ring accommodating groove along the axial direction of the outer ring.
Compared with the prior art, the invention has the advantages that:
1. according to the steam turbine inserted pipe sealing device, the outer ring C-shaped ring and the inner ring C-shaped ring are creatively arranged, the C-shaped ring is utilized to have excellent rebound performance, the outer diameter of the outer ring C-shaped ring is identical to the outer diameters of the outer ring main framework and the outer ring auxiliary framework in a free state, after the outer ring pre-tightening screw is pre-tightened, the outer diameter of the outer ring C-shaped ring is larger than the outer diameters of the outer ring main framework and the outer ring auxiliary framework, and the outer ring C-shaped ring cannot move in the outer ring C-shaped ring accommodating groove along the axial direction of the outer ring; in a free state, the inner diameter of the inner ring C-shaped ring is smaller than the inner diameters of the inner ring main framework and the inner ring auxiliary framework, and after the inner ring pre-tightening screw is pre-tightened, the inner ring C-shaped ring can move in the inner ring C-shaped ring accommodating groove along the axial direction of the inner ring, and meanwhile sealing of the axial direction and the section is achieved.
2. The steam turbine inserted pipe sealing device provided by the invention has the advantages that the C-shaped ring has excellent rebound resilience, and when the temperature is reduced, the contact surface separation phenomenon caused by the temperature reduction is compensated by utilizing the rebound resilience of the C-shaped ring.
Drawings
FIG. 1 is a schematic view of a prior art steam turbine insert tube sealing apparatus.
FIG. 2 is a schematic view of a leakage path of a prior art turbine insert tube seal.
FIG. 3 is a schematic view of the steam turbine insert tube sealing apparatus of the present invention.
FIG. 4 is a schematic view of a part of the sealing portion of the steam turbine insert tube sealing device of the present invention.
FIG. 5 is a schematic view of the inner ring pretension screw of the steam turbine insert tube sealing device of the present invention in a pre-tensioned state before and after.
FIG. 6 is a schematic view of the turbine insert tube sealing device of the present invention in a pre-tightening state before and after the outer ring pre-tightening screw.
FIG. 7 is a flow chart of a method of using the steam turbine insert tube sealing apparatus of the present invention.
Detailed Description
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "abutting" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
1-7, the steam turbine insertion pipe sealing device comprises an outer ring, an inner ring, an outer ring C-shaped ring 3 and an inner ring C-shaped ring 9, wherein the outer ring and the inner ring are coaxially abutted along the axis of the inner ring, and the outer ring comprises an outer ring pre-tightening screw 1, an outer ring main framework 2, an outer ring graphite ring 4 and an outer ring auxiliary framework 5; the inner diameter and the outer diameter of the outer ring main framework 2 and the outer ring auxiliary framework 5 are the same, and the lower surface of the outer ring main framework 2 is contacted with the upper surface of the outer ring auxiliary framework 5 and is coaxially and fixedly connected through an outer ring pre-tightening screw 1; the outer diameter surface of the outer ring main framework 2 is provided with an outer ring C-shaped ring positioning step, the outer ring C-shaped ring positioning step and the upper surface of the outer ring auxiliary framework 5 form an outer ring C-shaped ring accommodating groove, the outer ring C-shaped ring 3 is arranged in the outer ring C-shaped ring accommodating groove, the upper surface of the outer ring auxiliary framework 5 is provided with an outer ring sealing groove, the outer ring graphite ring 4 is arranged in the outer ring sealing groove, and the outer ring C-shaped ring 3 is abutted against the high-pressure inner cylinder 12 of the steam turbine; in a free state, the outer diameter of the outer ring C-shaped ring 3 is the same as the outer diameters of the outer ring main framework 2 and the outer ring auxiliary framework 5, after the outer ring pre-tightening screw 1 is pre-tightened, the outer diameter of the outer ring C-shaped ring 3 is larger than the outer diameters of the outer ring main framework 2 and the outer ring auxiliary framework 5, and the outer ring C-shaped ring 3 cannot move in the outer ring C-shaped ring accommodating groove along the axial direction of the outer ring; the inner ring comprises an inner ring graphite ring 6, an inner ring main framework 7, an inner ring auxiliary framework 8 and an inner ring pre-tightening screw 10; the inner diameters and the outer diameters of the inner ring main framework 7 and the inner ring auxiliary framework 8 are the same, and the lower surface of the inner ring main framework 7 is contacted with the upper surface of the inner ring auxiliary framework 8 and is coaxially and fixedly connected through an inner ring pre-tightening screw 10; the inner diameter surface of the inner ring main framework 7 is provided with an inner ring C-shaped ring positioning step, the inner ring C-shaped ring positioning step and the upper surface of the inner ring auxiliary framework 8 form an inner ring C-shaped ring accommodating groove, the inner ring C-shaped ring 9 is arranged in the inner ring C-shaped ring accommodating groove, the upper surfaces of the inner ring main framework 7 and the inner ring auxiliary framework 8 are provided with inner ring sealing grooves, the inner ring graphite ring 6 is arranged in the inner ring sealing grooves, the inner ring C-shaped ring 9 is abutted with an air inlet insertion pipe 13 of the steam turbine, and the inner ring main framework 7 is abutted with the outer ring; in a free state, the inner diameter of the inner ring C-shaped ring 9 is smaller than the inner diameters of the inner ring main framework 7 and the inner ring auxiliary framework 8, and after the inner ring pre-tightening screw 10 is pre-tightened, the inner ring C-shaped ring 9 can move in the inner ring C-shaped ring accommodating groove along the axial direction of the inner ring.
Preferably, the number of the outer ring graphite rings 4 is 2, and the 2 outer ring graphite rings are respectively positioned at the inner side and the outer side of the outer ring pre-tightening screw 1 in the radial direction of the outer ring so as to improve the sealing capability.
Preferably, the number of the inner ring graphite rings 6 is 3, the upper surface of the inner ring auxiliary framework 8 is provided with 2 inner ring sealing grooves, 2 inner ring graphite rings 6 in the 3 inner ring graphite rings are arranged on the 2 inner ring sealing grooves on the inner ring auxiliary framework 8, and in the radial direction of the inner ring, the 2 inner ring graphite rings are respectively positioned at the inner side and the outer side of the inner ring pre-tightening screw 10; the upper surface of the inner ring main framework 7 is provided with 1 inner ring sealing groove, 1 inner ring graphite ring 6 in 3 inner ring graphite rings is arranged in the inner ring sealing groove on the inner ring main framework 7, and in the radial direction of the inner ring, the 1 inner ring graphite ring is positioned outside the inner ring pre-tightening screw 10 so as to improve the sealing capability.
The application method of the steam turbine cannula sealing device comprises the following steps:
s0), assembling the inner ring:
s01), inner ring graphite ring 6: an inner ring graphite ring 6 is respectively arranged in an inner ring sealing groove on the upper surfaces of the inner ring main framework 7 and the inner ring auxiliary framework 8;
s02), mounting an inner ring C-shaped ring 9: an inner ring C-shaped ring 9 is arranged on an inner ring C-shaped ring positioning step arranged on the inner diameter surface of the inner ring main framework 7;
s03), assembling the inner ring main framework 7 and the inner ring auxiliary framework 8, abutting the lower surface of the inner ring main framework 7 and the upper surface 8 of the inner ring auxiliary framework, wherein the inner diameter of the inner ring C-shaped ring 9 is slightly smaller than the inner diameters of the inner ring main framework 7 and the inner ring auxiliary framework 8, and pre-tightening by using the inner ring pre-tightening screw 10, and at the moment, the inner ring C-shaped ring 9 can move along the axial direction of the inner ring in the inner ring C-shaped ring accommodating groove.
S1), mounting an inner ring:
the inner ring and the high-pressure inner cylinder 12 of the steam turbine are coaxially arranged on the concave surface of the high-pressure inner cylinder 12 of the steam turbine, an inner ring C-shaped ring accommodating groove is formed in the inner diameter surface of the inner ring, and an inner ring C-shaped ring 9 is arranged in the inner ring C-shaped ring accommodating groove;
s2), mounting an outer ring:
s21), mounting an outer ring graphite ring 4: an outer ring graphite ring 4 is placed in an outer ring sealing groove on the upper surface of the outer ring auxiliary framework 5;
s22), mounting an outer ring C-shaped ring 3: an outer ring C-shaped ring 3 is arranged on an outer ring C-shaped ring positioning step arranged on the outer diameter surface of the outer ring main framework 2;
s23), assembling the outer ring main frame 2 and the outer ring auxiliary frame 5: the lower surface of the outer ring main framework 2 is abutted with the upper surface of the outer ring auxiliary framework 5 and connected by using an outer ring pre-tightening screw 1, and at the moment, the outer diameter of the outer ring C-shaped ring 3 is the same as the outer diameters of the outer ring main framework 2 and the outer ring auxiliary framework 5;
s24), pre-tightening the outer ring main skeleton 2 and the outer ring auxiliary skeleton 5: the outer ring and the inner ring are coaxially arranged on the upper surface of the inner ring, the outer ring pretightening screw 1 is pretightened, the outer ring C-shaped ring 3 is outwards expanded and is abutted against the high-pressure inner cylinder 12 of the steam turbine, at the moment, the slightly outer diameter of the outer ring C-shaped ring 3 is larger than the outer diameters of the outer ring main framework 2 and the outer ring auxiliary framework 5, and the outer ring C-shaped ring 3 cannot move in the outer ring C-shaped ring accommodating groove along the axial direction of the outer ring;
s3), mounting limiting flange
A limiting flange 11 is arranged on the upper surface of the outer ring, and the limiting flange 11 positions the inner ring and the outer ring in the axial direction of the inner ring;
s4), installing an air inlet cannula;
and an air inlet insertion pipe 13 of the steam turbine is inserted into the central through holes of the inner ring and the outer ring, and the inner ring C-shaped ring 9 is abutted with the outer surface of the air inlet insertion pipe.
During operation, the inner ring C-shaped ring 9 and the outer ring C-shaped ring 3 are respectively in close contact with the steam inlet insertion pipe 13 and the high-pressure inner cylinder 12 to form axial sealing, and the end faces formed by the inner ring graphite ring 6 between the inner ring main framework 7 and the inner ring auxiliary framework 8 and the inner ring graphite ring 6 between the outer ring auxiliary framework 5 and the inner ring main framework 7 are sealed through the outer ring graphite ring 4 between the outer ring main framework 2 and the outer ring auxiliary framework 5, so that the whole sealing device forms complete sealing during operation of equipment.
What is not described in detail in the present specification belongs to the known technology of those skilled in the art.
Claims (6)
1. The steam turbine insertion pipe sealing device is characterized by comprising an outer ring, an inner ring, an outer ring C-shaped ring and an inner ring C-shaped ring, wherein the outer ring and the inner ring are coaxially abutted along the axis of the inner ring, an outer ring C-shaped ring accommodating groove is formed in the outer diameter surface of the outer ring, an inner ring C-shaped ring accommodating groove is formed in the inner diameter surface of the inner ring, the outer ring C-shaped ring is arranged in the outer ring C-shaped ring accommodating groove, and the inner ring C-shaped ring is arranged in the inner ring C-shaped ring accommodating groove; the outer ring C-shaped ring is in butt joint with a high-pressure inner cylinder of the steam turbine, and the inner ring C-shaped ring is in butt joint with an air inlet insertion pipe of the steam turbine;
the outer ring comprises an outer ring pre-tightening screw, an outer ring main framework, an outer ring graphite ring and an outer ring auxiliary framework; the inner diameter and the outer diameter of the outer ring main framework and the outer ring auxiliary framework are the same, and the lower surface of the outer ring main framework is contacted with the upper surface of the outer ring auxiliary framework and is coaxially and fixedly connected through an outer ring pre-tightening screw; the outer diameter surface of the outer ring main framework is provided with an outer ring C-shaped ring positioning step, the outer ring C-shaped ring positioning step and the upper surface of the outer ring auxiliary framework form an outer ring C-shaped ring accommodating groove, the upper surface of the outer ring auxiliary framework is provided with an outer ring sealing groove, an outer ring graphite ring is arranged in the outer ring sealing groove, in a free state, the outer diameter of the outer ring C-shaped ring is identical to the outer diameters of the outer ring main framework and the outer ring auxiliary framework, after the outer ring pre-tightening screw is pre-tightened, the outer diameter of the outer ring C-shaped ring is larger than the outer diameters of the outer ring main framework and the outer ring auxiliary framework, and the outer ring C-shaped ring cannot move in the outer ring C-shaped ring accommodating groove along the axial direction of the outer ring;
the inner ring comprises an inner ring graphite ring, an inner ring main framework, an inner ring auxiliary framework and an inner ring pre-tightening screw; the inner diameter and the outer diameter of the inner ring main framework and the inner ring auxiliary framework are the same, and the lower surface of the inner ring main framework is contacted with the upper surface of the inner ring auxiliary framework and is coaxially and fixedly connected through an inner ring pre-tightening screw; the inner diameter surface of the inner ring main framework is provided with an inner ring C-shaped ring positioning step, the inner ring C-shaped ring positioning step and the upper surface of the inner ring auxiliary framework form an inner ring C-shaped ring accommodating groove, the upper surfaces of the inner ring main framework and the inner ring auxiliary framework are provided with inner ring sealing grooves, the inner ring graphite rings are arranged in the inner ring sealing grooves, the inner ring main framework is abutted with the outer ring, the inner diameter of the inner ring C-shaped ring is smaller than the inner diameters of the inner ring main framework and the inner ring auxiliary framework in a free state, and after the inner ring pre-tightening screw is pre-tightened, the inner ring C-shaped ring can move in the inner ring C-shaped ring accommodating groove along the axial direction of the inner ring.
2. The steam turbine casing pipe sealing device according to claim 1, wherein the number of the outer ring graphite rings is 2, and the 2 outer ring graphite rings are respectively positioned on the inner side and the outer side of the outer ring pre-tightening screw in the radial direction of the outer ring.
3. The steam turbine insertion pipe sealing device according to claim 1, wherein the number of the inner ring graphite rings is 3, 2 inner ring sealing grooves are formed in the upper surface of the inner ring auxiliary framework, 2 inner ring graphite rings in the 3 inner ring graphite rings are arranged on the 2 inner ring sealing grooves on the inner ring auxiliary framework, and the 2 inner ring graphite rings are respectively positioned on the inner side and the outer side of the inner ring pre-tightening screw in the radial direction of the inner ring; the upper surface of the inner ring main framework is provided with 1 inner ring sealing groove, 1 inner ring graphite ring in 3 inner ring graphite rings is arranged in the inner ring sealing groove on the inner ring main framework, and in the radial direction of the inner ring, 1 inner ring graphite ring is arranged outside the inner ring pre-tightening screw.
4. The application method of the steam turbine cannula sealing device is characterized by comprising the following steps:
s1), placing an inner ring on a concave surface of a high-pressure inner cylinder of a steam turbine, wherein an inner ring C-shaped ring accommodating groove is formed in the inner diameter surface of the inner ring, and the inner ring C-shaped ring is arranged in the inner ring C-shaped ring accommodating groove;
s2), coaxially placing the outer ring and the inner ring on the upper surface of the inner ring, wherein an outer ring C-shaped ring accommodating groove is formed in the outer diameter surface of the outer ring, the outer ring C-shaped ring is arranged in the outer ring C-shaped ring accommodating groove, and the outer ring C-shaped ring is abutted with a high-pressure inner cylinder of the steam turbine;
s3), mounting a limiting flange on the upper surface of the outer ring, and positioning the inner ring and the outer ring in the axial direction of the inner ring by the limiting flange;
s4), inserting an air inlet insertion pipe of the steam turbine along the central through holes of the inner ring and the outer ring, and abutting the C-shaped ring of the inner ring with the outer surface of the air inlet insertion pipe.
5. The method of claim 4, wherein,
before step S1), the inner ring is assembled, comprising the steps of:
s01), mounting an inner ring graphite ring: respectively placing an inner ring graphite ring in an inner ring sealing groove on the upper surfaces of the inner ring main framework and the inner ring auxiliary framework;
s02), mounting an inner ring C-shaped ring: an inner ring C-shaped ring is arranged on an inner ring C-shaped ring positioning step arranged on the inner diameter surface of the inner ring main framework;
s03) assembling the inner ring main framework and the inner ring auxiliary framework, abutting the lower surface of the inner ring main framework with the upper surface of the inner ring auxiliary framework, enabling the inner diameter of the inner ring C-shaped ring to be smaller than the inner diameters of the inner ring main framework and the inner ring auxiliary framework, and pre-tightening by using an inner ring pre-tightening screw, wherein at the moment, the inner ring C-shaped ring can move in the inner ring C-shaped ring accommodating groove along the axial direction of the inner ring.
6. The method of claim 4, wherein the step of determining the position of the first electrode is performed,
step S2) comprises the steps of:
s21), mounting an outer ring graphite ring: an outer ring graphite ring is placed in an outer ring sealing groove on the upper surface of the outer ring auxiliary framework;
s22), mounting an outer ring C-shaped ring: an outer ring C-shaped ring is arranged on an outer ring C-shaped ring positioning step arranged on the outer diameter surface of the outer ring main framework;
s23), assembling an outer ring main skeleton and an outer ring auxiliary skeleton: the lower surface of the outer ring main framework is abutted with the upper surface of the outer ring auxiliary framework and connected by using outer ring pre-tightening screws, and at the moment, the outer diameter of the outer ring C-shaped ring is the same as the outer diameters of the outer ring main framework and the outer ring auxiliary framework;
s24), pre-tightening the outer ring main skeleton and the outer ring auxiliary skeleton: the outer ring and the inner ring are coaxially placed on the inner ring, the outer ring pre-tightening screw is pre-tightened, so that the outer ring C-shaped ring is abutted with the high-pressure inner cylinder of the steam turbine, at the moment, the outer diameter of the outer ring C-shaped ring is larger than the outer diameters of the outer ring main framework and the outer ring auxiliary framework, and the outer ring C-shaped ring cannot move in the outer ring C-shaped ring accommodating groove along the axial direction of the outer ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810422579.9A CN108533333B (en) | 2018-05-05 | 2018-05-05 | Steam turbine cannula sealing device and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810422579.9A CN108533333B (en) | 2018-05-05 | 2018-05-05 | Steam turbine cannula sealing device and use method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN108533333A CN108533333A (en) | 2018-09-14 |
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| CN108757053A (en) * | 2018-05-29 | 2018-11-06 | 黄文中 | A kind of high pressure, in be pressed into the close device of steam pipe |
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