CN115479048A - Rotatable guide vane shaft neck structure and air compressor - Google Patents
Rotatable guide vane shaft neck structure and air compressor Download PDFInfo
- Publication number
- CN115479048A CN115479048A CN202211244492.XA CN202211244492A CN115479048A CN 115479048 A CN115479048 A CN 115479048A CN 202211244492 A CN202211244492 A CN 202211244492A CN 115479048 A CN115479048 A CN 115479048A
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- Prior art keywords
- vane
- guide vane
- journal
- shaft
- arc segment
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- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 238000000227 grinding Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
- F04D29/462—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/56—Fluid-guiding means, e.g. diffusers adjustable
- F04D29/563—Fluid-guiding means, e.g. diffusers adjustable specially adapted for elastic fluid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a rotatable guide vane shaft neck structure and a gas compressor, wherein the shaft neck structure comprises a casing, at least one guide vane shaft and a vane body; the guide vane shaft is rotationally arranged on the casing and provided with a shaft neck; the blade body is the same with the quantity of guide vane axle and one-to-one setting, and the blade body has leading edge and trailing edge, and the blade body is fixed in on the axle journal, and the axle journal covers the leading edge and the trailing edge of blade body stiff end. The invention improves the shaft neck structure of the rotatable guide vane, avoids manual grinding, ensures that the guide vane can freely rotate in a large-angle range, avoids generating a gap between the blade and the casing, and improves the performance of the gas compressor.
Description
Technical Field
The invention relates to the technical field of gas compressors, in particular to a rotatable guide vane shaft neck structure and a gas compressor.
Background
In the structural design of an aircraft engine, in order to improve the stable working range of a gas compressor at a non-design point state and enable the engine to stably work at a non-design rotating speed, the front stages of stator blades of the gas compressor are often designed into a structural form capable of adjusting the angle.
In the actual assembly or use process of the adjustable guide vane, the problem of blade rotation and blocking caused by interference between the blade root (i.e. the blade boundary close to the casing end) of the adjustable guide vane and the inner wall of the casing often occurs, but in order to ensure that the compressor is in a better performance level, the smaller the gap between the blade root of the rotatable guide vane and the casing is, the better the gap is.
As shown in fig. 1, the conventional rotatable vane journal structure includes a vane 1, a casing 2, a rotatable vane shaft 3, a journal 4 and a non-journal covered blade root 5, wherein during the rotation of the rotatable vane shaft 3, the non-journal covered blade root 5 performs plane rotation on the blade root plane, the casing 2 corresponds to the flow channel circumferential direction as a circumferential surface, and when the gap between the non-journal covered blade root 5 and the casing 2 is too small, interference occurs.
In the prior art, a general method is that a small blade root gap is set between a non-journal covered blade root 5 and a casing 2 to determine a blade root profile, after numerical control machining and forming, proper manual grinding is carried out during assembly to ensure that a rotatable stationary blade rotates within an allowed angle range, and meanwhile, the gap between the blade root of the rotatable stationary blade and the casing is required to be as small as possible to avoid affecting the performance of a gas compressor. The manual grinding mode is adopted, time and labor are wasted, the labor cost is relatively high, molded lines of blades are different, the uniformity of blade root gaps is poor, the consistency is poor, the stability is relatively poor, the influence of the working condition of an engine on the blade root gaps of the adjustable guide blades cannot be considered, although the guide blades can normally rotate under the cold-state assembly state, the clamping phenomenon of the adjustable guide blades can still occur due to the fact that the parts are stressed and heated unevenly under the working condition of the engine, and the performance of the air compressor is greatly influenced by the factors.
Disclosure of Invention
The invention mainly aims to provide a rotatable guide vane journal structure and a gas compressor, aiming at avoiding manual grinding, ensuring that a guide vane can freely rotate in a large-angle range, and avoiding generating a gap between a blade and a casing so as to improve the performance of the gas compressor.
In order to achieve the above object, the present invention provides a rotatable vane journal structure and a compressor, including:
a case;
the guide vane shaft is rotatably arranged on the casing and provided with a shaft neck; and
the blade body, with the same and one-to-one setting of quantity of guide vane axle, the blade body has leading edge and trailing edge, the blade body is fixed in on the axle journal, just the axle journal covers the leading edge and the trailing edge of blade body stiff end.
Optionally, the cross section of the journal comprises two opposite variable curvature curved sides and two arc sides respectively connecting two ends of the two variable curvature curved sides.
Optionally, the variable-curvature curved edge includes a first arc segment, a second arc segment, and a third arc segment that are connected in sequence, and the first arc segment is equal to the third arc segment in radius, and is centrosymmetric with respect to the guide vane shaft.
Optionally, the centers of the first arc segment and the third arc segment are respectively on a circle which takes the center of the guide vane shaft as a circle center and has a radius of a first radius value, and the first radius value is a linear distance between two adjacent guide vane shaft centers.
Optionally, the radius values of the first circular arc segment and the third circular arc segment are 0.50 to 0.60 times the first radius value.
Optionally, the center of the second arc segment coincides with the center of the guide vane shaft, and the radius value of the second arc segment is 0.35 to 0.45 times of the first radius value.
Optionally, the center of the arc edge coincides with the center of the guide vane shaft, and the radius value of the arc edge is 0.50 to 0.60 times of the first radius value.
Optionally, the curvature-variable curved edges of two adjacent journals are arranged oppositely, and a gap between two adjacent curvature-variable curved edges is 0.2-1.0 mm.
Optionally, the guide vane shaft and the vane body are both made of aluminum alloy or stainless steel; the guide vane shaft and the vane body are integrally formed or assembled in a split mode.
To achieve the above object, the present invention further provides a compressor including the journal structure as described above, where the journal structure includes:
a case;
the guide vane shaft is rotatably arranged on the casing and is provided with a shaft neck; and
the blade body, with the same and one-to-one setting of quantity of guide vane axle, the blade body has leading edge and trailing edge, the blade body is fixed in on the axle journal, just the axle journal covers the leading edge and the trailing edge of blade body stiff end.
In the technical scheme of the invention, the rotatable guide vane journal structure comprises a casing, at least one guide vane shaft and a vane body; the guide vane shaft is rotationally arranged on the casing and is provided with a shaft neck; the blade body is the same with the quantity of guide vane axle and one-to-one setting, and the blade body has leading edge and trailing edge, and the blade body is fixed in on the axle journal, and the axle journal covers the leading edge and the trailing edge of blade body stiff end. It can be understood that, during the rotation of the blade, the blade body and the shaft neck are integrated, and no radial clearance exists between the blade body and the casing, so that the blade can rotate freely in a large angle range. In addition, the blade body and the shaft neck can be integrally processed and manufactured or assembled in a split mode, so that the later manual grinding is avoided, meanwhile, a gap between the blade and the casing is avoided, and the performance of the air compressor is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a cross-sectional view of a prior art journal structure;
FIG. 2 is a graph illustrating the effect of vane height to efficiency loss in a stationary vane in the prior art;
FIG. 3 is a schematic view of an embodiment of a rotatable vane journal structure of the present invention;
FIG. 4 is a schematic view of a vane shaft and a vane body according to an embodiment of the present invention;
FIG. 5 is a front view of a vane shaft and a vane body according to an embodiment of the rotatable vane journal structure of the present invention;
FIG. 6 is a schematic view of a journal profile in an embodiment of a rotatable vane journal structure of the present invention.
The reference numbers illustrate:
10. a case; 20. a guide vane shaft; 30. a blade body; 21. a journal; 301. a leading edge; 302. a trailing edge; 211. variable curvature curved edge; 212. a circular arc edge; 2111. a first arc segment; 2112. a second arc segment; 2113. a third arc segment.
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front, rear, 8230; \8230;) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components in a specific posture (as shown in the figure), the motion situation, etc., and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "A and/or B" as an example, including either the A aspect, or the B aspect, or both A and B satisfied aspects. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a rotatable guide vane shaft neck structure which is suitable for a gas compressor and is not limited in the position.
Referring to fig. 3 to 5, in an embodiment of the present invention, the rotatable vane journal structure includes a casing 10, at least one vane shaft 20, and a blade body 30; the guide vane shaft 20 is rotatably arranged on the casing 10, and the guide vane shaft 20 is provided with a shaft neck 21; the blade bodies 30 and the guide vane shafts 20 are arranged in the same number and one-to-one manner, the blade bodies 30 have a leading edge 301 and a trailing edge 302, the blade bodies 30 are fixed on the shaft journals 21, and the shaft journals 21 cover the leading edge 301 and the trailing edge 302 at the fixed ends of the blade bodies 30.
In this embodiment, the guide vane shaft 20 may be a cylindrical or non-cylindrical profile structure, but is not limited thereto.
The shaft journal 21 of the guide vane shaft 20 should at least partially cover the leading edge 301 and the trailing edge 302 of the fixed end of the vane body 30, and particularly, when the leading edge 301 and the trailing edge 302 of the fixed end of the vane body 30 are completely covered, there is no radial gap between the vane body 30 and the casing 10, and the vane shaft can freely rotate in a large range.
The guide vane shaft 20 and the vane body 30 may be made of aluminum alloy or stainless steel. The guide vane shaft 20 and the vane body 30 may be manufactured by integral molding, or the guide vane shaft 20 and the vane body 30 may be assembled by separation, which is not limited herein.
It can be understood that, during the rotation of the blade, the blade body 30 is integrated with the journal 21, and there is no radial clearance between the blade body 30 and the casing 10, so that the blade can rotate freely in a large angle range. In addition, the blade body 30 and the shaft neck 21 can be integrally processed and manufactured or assembled in a split mode, so that the later manual grinding is avoided, meanwhile, a gap between the blade and the casing 10 is avoided, and the performance of the air compressor is improved.
It is worth mentioning that in the prior art, as shown in fig. 2, when the adjustable guide vane is covered at a rotation angle of 0 to 90 degrees, the clearance-to-vane ratio of the conventional adjustable guide vane structure reaches 1%, and the efficiency loss is about 2%. And no clearance exists between the blade root and the casing of the blade body 30, so that the performance of the compressor is improved. In addition, the structure of the invention only needs to be finished in the processing process, thereby avoiding the subsequent procedures of manual polishing and the like, improving the assembly efficiency and ensuring the consistency of the blade profile line of the blade.
Since the journal structure described above may cause the diameter of the journal 21 to be too large, when the number of blades is large and the journal 21 is of a conventional cylindrical shape, there may be interference between two adjacent journals 21 during rotation. The invention therefore also provides a further improvement to the journal 21.
As shown in fig. 4 and 6, the journal 21 of the present invention has an unconventional cylindrical structure, and the cross section of the journal 21 includes two opposite curvature-variable curved sides 211 and two arc sides 212 respectively connecting two ends of the two curvature-variable curved sides 211.
Referring mainly to fig. 6, in this embodiment, each of the variable curvature curved sides 211 may include a first arc segment 2111, a second arc segment 2112, and a third arc segment 2113 connected in sequence, where the first arc segment 2111 and the third arc segment 2113 have the same radius and are centrosymmetric with respect to the guide vane shaft 20.
In order to further avoid interference between two adjacent shaft journals 21 in the rotating process, improve the smoothness of blade rotation, and limit the rotating range of the blade within a rotation angle of 0 to 90 degrees, so as to meet the requirement of fully closing to a fully open angle, in the present embodiment, as shown in fig. 6, the centers of the first arc section 2111 and the third arc section 2113 are respectively on a circle with the center of the guide vane shaft 20 as the center and the radius as the first radius value, and the first radius value is the linear distance between the centers of two adjacent guide vane shafts 20.
The radius values of the first circular arc section 2111 and the third circular arc section 2113 can be 0.50-0.60 times of the first radius value. The center of the second arc 2112 coincides with the center of the guide vane shaft 20, and the radius of the second arc 2112 may be 0.35 to 0.45 times the first radius. The center of the arc edge 212 coincides with the center of the guide vane shaft 20, and the radius value of the arc edge 212 may be 0.50 to 0.60 times the first radius value.
It should be noted that the variable curvature profiles on both sides of the fully covered journal 21 can be manufactured by various machining processes such as wire cutting or milling.
By adopting the variable curvature cross section journal 21, the variable curvature curved edges 211 of two adjacent journals 21 are oppositely arranged, and the gap between the two adjacent variable curvature curved edges 211 is 0.2-1.0 mm, so that the gap between guide vanes is always maintained in a better range in the adjusting process of the guide vanes, and the reliable operation of a mechanism is ensured.
In addition, the invention has already finished the processing of the test piece and angle debugging of the guide vane, the result shows that the journal structure of the invention can realize the rotatable 0-90 degrees of rotation angle coverage of the guide vane.
The invention further provides a compressor, which comprises a shaft neck structure, the specific structure of the shaft neck structure refers to the above embodiments, and the compressor provided by the invention comprises all the solutions of all the embodiments of the shaft neck structure, so that the compressor has at least the same technical effects as the shaft neck structure, and the technical effects are not explained in detail herein.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A rotatable vane journal structure, comprising:
a case;
the guide vane shaft is rotatably arranged on the casing and is provided with a shaft neck; and
the blade body, with the same and one-to-one setting of quantity of guide vane axle, the blade body has leading edge and trailing edge, the blade body is fixed in on the axle journal, just the axle journal covers the leading edge and the trailing edge of blade body stiff end.
2. The rotatable vane journal structure of claim 1 wherein the journal has a cross-section including two opposing variable curvature curved sides and two arcuate sides connecting the two ends of the variable curvature curved sides.
3. The rotatable vane journal structure of claim 2 wherein the variable curvature curved edge includes a first arc segment, a second arc segment, and a third arc segment connected in series, the first arc segment and the third arc segment having equal radii and being centered symmetrically about the vane axis.
4. The rotatable vane journal structure of claim 3 wherein the centers of the first and third arc segments are on respective circles centered on the vane shaft center and having a radius of a first radius value, the first radius value being a linear distance between the centers of two adjacent vane shafts.
5. The rotatable vane journal structure of claim 4 wherein the radius of the first arc segment and the third arc segment has a value of 0.50 to 0.60 times the first radius value.
6. The rotatable vane journal structure of claim 5 wherein a center of the second circular arc segment coincides with a center of the vane shaft and a radius of the second circular arc segment is 0.35 to 0.45 times the first radius.
7. The rotatable vane journal structure of claim 6 wherein a center of the radiused edge coincides with a center of the vane shaft and the radiused edge has a radius value of 0.50 to 0.60 times the first radius value.
8. The rotatable vane journal structure of claim 7 wherein the variable curvature curved edges of adjacent journals are disposed opposite each other and the gap between adjacent variable curvature curved edges is 0.2 mm to 1.0mm.
9. The rotatable vane journal structure of claim 1 wherein the vane shaft and the vane body are both aluminum alloy or stainless steel; the guide vane shaft and the vane body are integrally formed or assembled in a split mode.
10. A compressor comprising a rotatable vane journal structure as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211244492.XA CN115479048A (en) | 2022-10-11 | 2022-10-11 | Rotatable guide vane shaft neck structure and air compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211244492.XA CN115479048A (en) | 2022-10-11 | 2022-10-11 | Rotatable guide vane shaft neck structure and air compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115479048A true CN115479048A (en) | 2022-12-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211244492.XA Pending CN115479048A (en) | 2022-10-11 | 2022-10-11 | Rotatable guide vane shaft neck structure and air compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115479048A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1723336A (en) * | 2003-06-26 | 2006-01-18 | 阿维德·默里·约翰逊 | Linear into rotatory or vice versa motion convertor |
| RU2304234C2 (en) * | 2002-01-29 | 2007-08-10 | Снекма Моторс | Device for control of rotatable blade in compressor |
| CN114321019A (en) * | 2021-12-27 | 2022-04-12 | 中国航发沈阳发动机研究所 | Adjustable stator structure of gas compressor |
-
2022
- 2022-10-11 CN CN202211244492.XA patent/CN115479048A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2304234C2 (en) * | 2002-01-29 | 2007-08-10 | Снекма Моторс | Device for control of rotatable blade in compressor |
| CN1723336A (en) * | 2003-06-26 | 2006-01-18 | 阿维德·默里·约翰逊 | Linear into rotatory or vice versa motion convertor |
| CN114321019A (en) * | 2021-12-27 | 2022-04-12 | 中国航发沈阳发动机研究所 | Adjustable stator structure of gas compressor |
Non-Patent Citations (1)
| Title |
|---|
| "《科学技术与工程》第十三卷总目录", 科学技术与工程, no. 36, 28 December 2013 (2013-12-28) * |
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