CN115628115A - Method and device for repairing annular blade mortise of casing of gas compressor - Google Patents
Method and device for repairing annular blade mortise of casing of gas compressor Download PDFInfo
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- CN115628115A CN115628115A CN202211315655.9A CN202211315655A CN115628115A CN 115628115 A CN115628115 A CN 115628115A CN 202211315655 A CN202211315655 A CN 202211315655A CN 115628115 A CN115628115 A CN 115628115A
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- Prior art keywords
- mortise
- casing
- compressor
- annular blade
- thickness
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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
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/005—Repairing methods or devices
Abstract
The invention provides a method for repairing an annular blade mortise of a casing of an air compressor, which comprises the following steps: s1: judging whether the annular mortise contour of the casing of the gas compressor exceeds a threshold value, if so, performing S2, and if not, not needing to be repaired; s2: processing a working surface, a fillet and a bottom surface of the mortise to ensure that the profiles of the three surfaces of the mortise have the same thickness; s3: selecting a mortise gasket with the thickness same as the thickness of the surface profile; s4: and (3) before assembling the blades, putting the mortise gasket obtained in the step (S3) into the corresponding out-of-tolerance side of the mortise, and then installing the corresponding stator blade. The repairing method is easy to realize, can repair the mortises with any out-of-tolerance size, is not influenced by factors such as binding force and the like, does not need heating in the repairing process, does not cause the casing to generate extra deformation, is suitable for any processing stage, and does not need to consider whether the casing still has allowance; the method has good universality, can effectively reduce the scrappage of the casing, and reduces the processing and maintenance cost.
Description
Technical Field
The invention belongs to the technical field of gas turbine component repair, and particularly relates to a method and a device for repairing an annular blade mortise of a casing of an air compressor.
Background
The stator blades of the compressor of the gas turbine are of two types, namely adjustable stator blades with journals and non-adjustable stator blades with T-shaped tenons. The adjustable stationary blade is typically secured within a circular mounting hole of the compressor case by a nut. The non-adjustable stationary blade is arranged in an annular T-shaped mortise of the casing of the compressor. In order to reduce the vibration of the blade during the operation of the engine, the fit clearance of the tenon and the mortise cannot be too large or too small, which requires high machining precision of the mortise.
In the actual machining process, due to factors such as cutter abrasion and part deformation, the actual contour of the mortise of the casing is larger than the theoretical contour, and the whole casing can be directly scrapped when the actual contour is seriously accepted. The working procedure of processing the mortise is generally a working procedure arranged behind the casing processing, and if the whole casing is directly scrapped due to the out-of-tolerance of the mortise, great waste is caused. However, if the engine is directly used without treatment, the problems of large vibration of the engine, accelerated abrasion of the blades and the like can be caused in the future.
In addition, after the gas turbine works for a long time, the size of the mortise may be increased and out of tolerance due to fretting wear between the tenon and the mortise of the blade, and at this time, if the mortise is not repaired in time, the performance of the gas compressor is reduced, the service life of parts such as the blade is shortened, and the like. However, since the gas turbine compressor casing has a complex manufacturing process and a high cost, if the new compressor casing is directly replaced, the maintenance cost is greatly increased.
Therefore, the casing mortise repair is realized by adopting the targeted repair method and the targeted repair device, and the method is an effective way for reducing scrappage and reducing the operation and maintenance cost of the gas turbine. In the prior art, the metal powder is generally cladded on the surface of the mortise by adopting a thermal spraying or surfacing mode, and then the mortise is machined to the correct size again, but the method has the following defects: 1. after a certain thickness is exceeded, the binding force is greatly reduced, and the binding force is easy to fall off when the machine is used again; 2. if the spraying or welding temperature is high, deformation of the casing may also occur. 3. The mortise is small in size, and spraying or welding is difficult to implement. And if the mortises with larger sizes are not processed, the blade tenons are enlarged to be assembled with the mortises. The interchangeability of the blades assembled in the step 1 is lost, and the blades of one piece number in the step 2 have various specifications, are poor in economical efficiency and are inconvenient to uniformly manage.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a method and a device for repairing a mortise of an annular blade of a casing of an air compressor.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the repair method for the annular blade mortise of the compressor casing comprises the following steps:
s1: judging whether the annular mortise contour of the casing of the gas compressor exceeds a threshold value, if so, performing S2, and if not, not needing to be repaired;
s2: processing a working surface, a fillet and a bottom surface of the mortise to ensure that the profiles of the three surfaces of the mortise have the same thickness;
s3: selecting a mortise gasket with the thickness same as the thickness of the surface profile;
s4: and (3) before assembling the blades, putting the mortise gasket obtained in the step (S3) into the corresponding out-of-tolerance side of the mortise, and then installing the corresponding stator blade.
The method for repairing the annular blade mortise of the compressor casing is also characterized in that the mortise gasket is a spare gasket which is processed in advance and has multiple thicknesses.
The method for repairing the annular blade mortise of the compressor casing is further characterized in that the thickness difference of the plurality of spare gaskets is 0.02mm.
Another object of the invention is to provide a repair device for annular blade mortises of compressor casings, said device being intended to carry out the repair method according to any one of claims 1 to 3, comprising a left-hand and a right-hand mortise shim corresponding to the annular blade mortises of the compressor casings.
The annular blade mortise repairing device for the compressor casing provided by the invention is also characterized in that the structure and the material of the left-side mortise gasket are the same as those of the right-side mortise gasket.
The annular blade mortise repairing device of the compressor casing provided by the invention is also characterized in that the left mortise gasket structure is a metal semi-ring with a V-shaped section,
the V-shaped outer contour is superposed with the inner side surface of the working interval at the left side of the mortise, the V-shaped inner contour is obtained by the thickness A of the outer contour offset in the normal direction,
the offset thickness A is the same as the out-of-tolerance dimension of the left mortise profile.
The annular blade mortise repairing device for the compressor casing provided by the invention also has the characteristic that the left side mortise gasket is made of high-temperature alloy with the hardness of more than 42 HRC.
The annular blade mortise repairing device for the compressor case is further characterized in that after the left side mortise gasket is machined, the parameters of the left side mortise gasket are marked on the surface of the left side mortise gasket.
Has the beneficial effects that:
compared with the existing thermal spraying, surfacing welding and the like, the method for repairing the annular blade mortise of the compressor casing is easier to realize, the mortise with any out-of-tolerance size can be repaired without being influenced by factors such as binding force and the like, and the casing is not required to be heated in the repairing process and is not additionally deformed, so that the method is suitable for any processing stage and does not need to consider whether the casing has allowance or not; the method has good universality, is suitable for repairing any annular blade mortise on the casing, can effectively reduce the scrappage of the casing, and reduces the processing and maintenance cost.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a dovetail annular mortise structure of a casing repaired by a method for repairing an annular blade mortise of a compressor casing according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a compressor mortise provided in an embodiment of the present invention;
fig. 3 is a schematic structural view of a tongue-and-groove gasket according to an embodiment of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the following embodiments are combined with the accompanying drawings to specifically describe the repair method and the repair device for the annular blade mortise of the compressor casing.
In the description of the embodiments of the present invention, it should be understood that the terms "central", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only used for convenience in describing and simplifying the description of the present invention, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
As shown in fig. 1-2, a compressor casing 1 of a gas turbine is generally formed in a split structure, i.e., divided into an upper half and a lower half along a circumference of 0 to 180 degrees, and is formed by forging or forging and machining a metal material. In order to reduce the weight of the gas turbine, the casing is usually made into a thin-walled structure, and the minimum wall thickness is about 2mm. The casing center of rotation is also the axis of rotation of the gas turbine. An annular mortise 2 machined on the inner wall of the casing is used for installing the stator blade.
The annular dovetail mortise structure on the casing can be roughly divided into a plurality of parts, namely a left working surface 2-1, a left round angle 2-2, a left bottom surface 2-3, a right working surface 2-4, a right round angle 2-5, a right bottom surface 2-6 and a mortise rotation center line 4. The left working face 2-1 and the right working face 2-4 are contact matching faces of the mortise and the tenon, and the rest faces have a certain clearance with the tenon under normal conditions, and the clearance is about 0.1. The dimensions of the mortise are usually constrained in the design of the mortise in the form of a theoretical profile plus a face profile. For example, a face profile is 0.1, meaning that the normal distance between the actual profile and the theoretical profile does not exceed ± 0.05, a distance of positive is considered that the actual profile is larger than the theoretical profile, and a distance of negative is considered that the actual profile is smaller than the theoretical profile. If the actual profile is too small, the mortise can also be made to an acceptable size by removing material, and therefore not in the mortise repair discussion. The repairing method only considers the condition that the actual contour is larger than the theoretical contour and exceeds the surface contour degree required by the design. It can be seen from the figure that if the profile of the left or right working surface 2-1, 2-4 of the mortise is larger than the theoretical profile, not only will the gap of the tenon of the blade in the mortise be larger, but also the blade will deviate from the designed position, etc.
Therefore, the embodiment of the invention provides a method for repairing a mortise of an annular blade of a casing of an air compressor, which comprises the following steps:
s1: judging whether the annular mortise outline of the casing of the compressor exceeds a threshold value, if so, performing S2, and if not, not needing to be repaired;
s2: processing a working surface, a fillet and a bottom surface of the mortise to ensure that the profiles of the three surfaces of the mortise have the same thickness;
s3: selecting a mortise gasket with the thickness same as the thickness of the surface profile;
s4: and (4) before assembling the blades, putting the mortise gasket obtained in the step (S3) into the corresponding out-of-tolerance side of the mortise, and then installing the corresponding stator blade.
In some embodiments, assuming the out-of-tolerance is within 0.05, if the actual surface profile-the design maximum profile is less than or equal to 0.05, the tongue and groove will not be repaired. After the out-of-tolerance is larger than 0.05, the working face, the fillet and the bottom face of the mortise are machined again until the profile degrees of the three faces are the actual profile degrees, a mortise gasket with the thickness being the same as the profile degree of the three faces is machined, the mortise gasket is placed on one side of the corresponding out-of-tolerance of the mortise before the blade is assembled, and then the corresponding stator blade is installed.
In some embodiments, the tongue and groove shims are pre-machined multiple thickness backup shims for repair convenience. The thickness of the gasket is from 0.1mm to 0.2mm. When repairing, the corresponding tongue-and-groove gasket can be directly matched.
In some embodiments, the plurality of backup pads have a thickness differential of 0.02mm.
In some embodiments, as shown in FIG. 3, there is provided a compressor case annular blade dovetail repair apparatus for performing any of the repair methods described above, including a left side dovetail shim 3-1 and a right side dovetail shim 3-2 corresponding to the compressor case annular blade dovetail.
In some embodiments, the left tongue and groove shim 3-1 is made of the same material and structure as the right tongue and groove shim 3-2.
In some embodiments, the left tongue and groove gasket structure is a metal half ring with a V-shaped section,
the V-shaped outer contour is superposed with the inner side surface of the working area at the left side of the mortise, namely the left working surface 2-1, the left working fillet 2-2 and the left bottom surface 2-3, the V-shaped inner contour is obtained by the offset thickness A of the outer contour along the normal direction,
the offset thickness A is the same as the out-of-tolerance dimension of the left mortise profile.
In addition, in order to ensure that the left-side mortise gasket does not interfere with the blade after being added, the width of the left-side mortise gasket is smaller than the width B of the left-side mortise.
In some embodiments, assuming an actual left-side mortise profile tolerance of +0.2 and a design profile tolerance of 0.1 (i.e., + -0.05), i.e., a profile tolerance out of tolerance of +0.15, the offset thickness A is 0.15.
In some embodiments, the left tongue and groove shim is made of a high temperature alloy having a hardness greater than 42 HRC. The metal plate forming can be adopted, and the forge piece lathing forming can also be adopted.
In some embodiments, the left-side tongue and groove shim is surface marked with parameters after machining. Parameters of the tongue and groove shim include, but are not limited to, the use of blade tongue and groove in the fourth stage; is a left side mortise or a right side mortise; the thickness of the gasket.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A method for repairing a mortise of an annular blade of a casing of a compressor is characterized by comprising the following steps:
s1: judging whether the annular mortise contour of the casing of the gas compressor exceeds a threshold value, if so, performing S2, and if not, not needing to be repaired;
s2: processing a working surface of the mortise, a fillet and a bottom surface of the mortise to ensure that the profiles of the three surfaces of the mortise have the same thickness;
s3: selecting a mortise gasket with the thickness same as the thickness of the surface profile;
s4: and (3) before assembling the blades, putting the mortise gasket obtained in the step (S3) into the corresponding out-of-tolerance side of the mortise, and then installing the corresponding stator blade.
2. The compressor case annular blade dovetail repair method of claim 1, wherein said dovetail shim is a backup shim of multiple thicknesses machined in advance.
3. The compressor case annular blade dovetail repair method of claim 2, wherein said plurality of backup shims differ in thickness by 0.02mm.
4. A repair device for annular blade mortises of compressor casings, characterized in that it is adapted to carry out a repair method according to any one of claims 1 to 3, comprising a left-hand and a right-hand mortise shim corresponding to the annular blade mortises of the compressor casings.
5. The compressor casing annular blade dovetail repair device of claim 4, wherein the left-side dovetail shim is the same structure and material as the right-side dovetail shim.
6. The compressor casing annular blade dovetail repair device of claim 5, wherein said left-side dovetail shim structure is a V-section metal half ring,
the V-shaped outer contour is superposed with the inner side surface of the working interval at the left side of the mortise, the V-shaped inner contour is obtained by the thickness A of the outer contour offset in the normal direction,
the offset thickness A is the same as the out-of-tolerance dimension of the left mortise profile.
7. The compressor casing annular blade dovetail repair device of claim 5 or 6, wherein the left-side dovetail shim is a high-temperature alloy with a hardness greater than 42 HRC.
8. The compressor casing annular blade dovetail repair device according to claim 5 or 6, wherein the left-side dovetail shim is surface-marked with parameters after machining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211315655.9A CN115628115A (en) | 2022-10-25 | 2022-10-25 | Method and device for repairing annular blade mortise of casing of gas compressor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211315655.9A CN115628115A (en) | 2022-10-25 | 2022-10-25 | Method and device for repairing annular blade mortise of casing of gas compressor |
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| Publication Number | Publication Date |
|---|---|
| CN115628115A true CN115628115A (en) | 2023-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211315655.9A Pending CN115628115A (en) | 2022-10-25 | 2022-10-25 | Method and device for repairing annular blade mortise of casing of gas compressor |
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| CN (1) | CN115628115A (en) |
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- 2022-10-25 CN CN202211315655.9A patent/CN115628115A/en active Pending
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