CN109252902B - Axial limiting structure and turbine engine - Google Patents
Axial limiting structure and turbine engine Download PDFInfo
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- CN109252902B CN109252902B CN201811075684.6A CN201811075684A CN109252902B CN 109252902 B CN109252902 B CN 109252902B CN 201811075684 A CN201811075684 A CN 201811075684A CN 109252902 B CN109252902 B CN 109252902B
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
- F01D25/246—Fastening of diaphragms or stator-rings
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Abstract
The invention relates to the technical field of engines, in particular to an axial limiting structure. The axial limiting structure is used for preventing the outer ring of the turbine from axially moving and separating from the turbine casing, and the axial limiting structure can comprise an arc-shaped fixing rod, a fixing part and an annular groove arranged on the turbine casing; the arc-shaped fixed rod is arranged in the annular groove, protrudes out of the annular groove and is abutted against the axial side wall of the turbine outer ring; the fixed part is used for fixing the arc-shaped fixed rod. The arc-shaped fixed rod is synchronous with thermal deformation of the turbine casing and the turbine outer ring, so that the generated temperature stress is smaller and the turbine is safer; the axial limiting structure is not easy to fail compared with the axial limiting structure in the related art.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an axial limiting structure and a turbine engine provided with the same.
Background
In the existing gas turbine engine and ground combustion engine, axial limiting is usually carried out on the outer ring of the turbine through a spiral retainer ring or a piston ring; or a part adjacent to the outer ring of the turbine is adopted to axially limit the outer ring of the turbine.
However, the axial limit is unstable and easy to fail due to the problems of thermal stress, thermal deformation and the like under high temperature, and the safety of the engine is affected.
Therefore, there is a need to develop a new axial restraining structure and a turbine engine having the same mounted thereto.
The above information of the invention of the background section is only for enhancing understanding of the background of the invention, and thus it may include information that does not constitute related art known to those of ordinary skill in the art.
Disclosure of Invention
The invention aims to overcome the defect that the axial limiting structure in the related art is easy to lose efficacy, and provides an axial limiting structure and a turbine engine with the axial limiting structure which are difficult to lose efficacy.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
According to an aspect of the present invention, there is provided an axial stopper structure for preventing an outer ring of a turbine from being axially displaced away from a turbine casing, comprising:
an annular groove disposed in the turbine case;
the arc-shaped fixing rod is arranged in the annular groove and protrudes out of the annular groove to abut against the axial side wall of the turbine outer ring;
and the fixing part is used for fixing the arc-shaped fixing rod.
In one exemplary embodiment of the present invention,
the arc-shaped fixing rod is fixed on the turbine outer ring or the turbine casing.
In one exemplary embodiment of the present invention,
the fixing portion includes:
the bulge is arranged on the axial side wall of the outer ring of the turbine;
the first hook is arranged at one end of the arc-shaped fixed rod and hooks the protrusion;
and the second hook is arranged at the other end of the arc-shaped fixed rod and hooks the protrusion.
In one exemplary embodiment of the present invention,
the protrusion is arranged in a circular arc shape parallel to the annular groove.
In one exemplary embodiment of the present invention,
the projection comprises two bosses arranged at intervals.
In one exemplary embodiment of the present invention,
be provided with the blind hole on the turbine casing, the fixed part includes:
the first bending rod is arranged at one end of the arc-shaped fixed rod and extends into the blind hole;
and the second bending rod is arranged at the other end of the arc-shaped fixed rod and extends into the blind hole.
In one exemplary embodiment of the present invention,
the arc-shaped fixing rod is made of the same material as the outer ring of the turbine.
In one exemplary embodiment of the present invention,
the arc-shaped fixing rods are arranged in a plurality of groups, and the fixing parts are arranged in a plurality of groups.
In one exemplary embodiment of the present invention,
the axial section of the arc-shaped fixed rod is one of a circle, a rectangle and a trapezoid; correspondingly, the axial section of the annular groove is one of a circle, a rectangle and a trapezoid.
According to one aspect of the present invention, there is provided a turbine engine comprising:
the axial limit structure of any one of the above.
According to the technical scheme, the invention has at least one of the following advantages and positive effects:
according to the axial limiting structure and the turbine engine, the arc-shaped fixing rod protrudes out of the annular groove and is abutted against the axial side wall of the turbine outer ring, and the part of the arc-shaped fixing rod protruding out of the groove blocks the axial side wall of the turbine outer ring to achieve the purpose of limiting axial displacement. The arc-shaped fixing rod is fixed through the fixing part, so that the arc-shaped fixing rod cannot be separated from the groove, and the outer ring of the turbine is reliably limited; because the arc-shaped fixed rod is arranged between the turbine casing and the turbine outer ring and is synchronous with the thermal deformation of the turbine casing and the turbine outer ring, the generated temperature stress is smaller and the turbine is safer. Meanwhile, the arc-shaped fixing rod is not elastic originally, the phenomenon of failure caused by plastic deformation in the related technology can not occur, and the axial limiting structure in the related technology is not easy to fail.
Drawings
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
FIG. 1 is a schematic structural diagram of axial limiting of a turbine outer ring by a spiral retainer ring or a piston ring;
FIG. 2 is a schematic view of a structure for axially limiting a turbine outer ring by using a part adjacent to the turbine outer ring;
FIG. 3 is a schematic cross-sectional view of an axial stop arrangement according to the present invention;
FIG. 4 is an enlarged schematic view of portion A of FIG. 3;
FIG. 5 is a schematic view of an arc-shaped retaining rod of the axial stop arrangement of the present invention;
FIG. 6 is a side view structural schematic of a turbine outer ring.
The reference numerals of the main elements in the figures are explained as follows:
1. a turbine case; 101. a first baffle plate; 102. a first annular bending plate; 103. a second baffle; 104. a second annular bending plate; 105. a first annular barrier plate; 106. a second annular barrier plate; 107. a limiting groove; 2. a turbine outer ring; 3. a working blade; 4. a helical retainer or piston ring; 5. adjacent parts; 6. an annular groove; 7. an arc-shaped fixing rod; 8. and (4) a boss.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
Referring to a schematic structural diagram of axial limiting of a turbine outer ring by using a spiral retainer ring or a piston ring shown in fig. 1, in the related art, the temperature level of a turbine is higher and higher when the working blades 3 continuously work, and the turbine outer ring is usually designed in a segmented manner in order to improve efficiency and reduce thermal stress; the radial positioning of the turbine outer ring 2 is ensured by the matching of a hook and the turbine casing 1, and the axial limiting usually adopts a spiral retaining ring or a piston ring 4 to axially limit the turbine outer ring 2; referring to fig. 2, a structural diagram of the turbine outer ring axial limiting by using a part adjacent to the turbine outer ring is shown, and the turbine outer ring 2 axial limiting by using a part adjacent to the turbine outer ring 2 is shown.
The spiral retainer ring is easy to deform under the high-temperature condition, the expansion ring is easy to deform plastically, the elasticity is reduced, and the spiral retainer ring or the expansion ring is easy to separate from the turbine casing 1, so that the axial limit of the turbine outer ring 2 is lost, the turbine outer ring 2 is separated from the turbine casing 1, the safety of an engine is affected, and the large-size spiral retainer ring and the large-size expansion ring are high in manufacturing cost. When the adjacent parts 5 of the turbine outer ring 2 are adopted to axially limit the turbine outer ring 2 in another exemplary embodiment, due to the influence of processing errors and thermal deformation mismatching, the gap between the limiting part and the turbine outer ring 2 is difficult to meet the use requirement, and when the gap is smaller, the part is heated and expanded in a thermal state, so that the gap is possibly reduced to zero, and the part is further damaged; when the clearance is too large, the turbine outer ring 2 may be separated from the turbine casing 1 in a hot state, which affects the engine safety.
The invention firstly provides an axial limiting structure, which is used for preventing the axial displacement of a turbine outer ring 2 from separating from a turbine casing 1, and referring to a section schematic diagram of the axial limiting structure of the invention shown in fig. 3, the axial limiting structure can comprise an annular groove 6, a fixing part and an arc-shaped fixing rod 7 which are arranged on the turbine casing 1; the arc-shaped fixing rod 7 protrudes out of the annular groove 6 and is abutted against the axial side wall of the turbine outer ring 2; the fixing part is used for fixing the arc-shaped fixing rod 7.
The arc-shaped fixed rod protrudes out of the annular groove and is abutted against the axial side wall of the outer ring of the turbine, and the part of the arc-shaped fixed rod protruding out of the groove blocks the axial side wall of the outer ring of the turbine to achieve the purpose of limiting axial displacement. The arc-shaped fixing rod is fixed through the fixing part, so that the arc-shaped fixing rod cannot be separated from the groove, and the outer ring of the turbine is reliably limited; because the arc-shaped fixed rod is arranged between the turbine casing and the turbine outer ring and is synchronous with the thermal deformation of the turbine casing and the turbine outer ring, the generated temperature stress is smaller and the turbine is safer. Meanwhile, the arc-shaped fixed rod is not elastic originally, so that the phenomenon of failure caused by plastic deformation in the related technology can be avoided, and the failure is difficult to occur compared with the axial limiting structure in the related technology; the arc-shaped fixing rod can be made of relatively low-price materials, and compared with the related art, the arc-shaped fixing rod can reduce a large amount of manufacturing cost.
Referring to fig. 3 and 6, when the engine works, the multi-segment turbine outer ring 2 is generally matched to complete the work, and the multi-segment turbine outer ring 2 is tightly attached.
The following description mainly makes specific reference to the axial limitation of the outer ring 2 of one segment of the turbine,
the part of the arc-shaped fixed rod protruding out of the groove blocks the axial side wall of the outer ring of the turbine to achieve the purpose of limiting axial displacement. The arc-shaped fixing rod is fixed through the fixing part, so that the arc-shaped fixing rod cannot be separated from the groove, and the outer ring of the turbine is reliably limited; because the arc-shaped fixed rod is arranged between the turbine casing and the turbine outer ring and is synchronous with the thermal deformation of the turbine casing and the turbine outer ring, the generated temperature stress is smaller, even the temperature stress is not generated, and the safety is higher. Meanwhile, the arc-shaped fixing rod is not elastic originally, the phenomenon of failure caused by plastic deformation in the related technology can not occur, and the axial limiting structure in the related technology is not easy to fail.
In the present example embodiment, the annular groove 6 is provided on the turbine casing 1; the cross-sectional shape of the annular groove may be semicircular, rectangular, or other shape.
In the present example embodiment, as shown with reference to fig. 3 and 5, the fixing portion may include a projection provided to an axial side wall of the turbine outer ring 2; locate the first couple of one end of arc dead lever 7 and locate the second couple of the other end of arc dead lever 7, first couple hooks the protrusion respectively with the second couple.
The bulge can be in the shape of a circular arc parallel to the annular groove 6, and the bulge adopting the structure chart is matched with the arc-shaped fixing rod 7, so that no gap is generated to influence the fixing firmness. The projections may be two spaced apart projections 8, i.e. a set of two projections. The first hook and the second hook at the two ends of the arc-shaped fixed rod 7 hook the two bosses 8 respectively, and the fixing is stable.
The protrusions can be in a plurality of groups, and the number of the corresponding bosses 8 can also be a plurality; the arc-shaped fixing rod 7 can adopt a segmented structure, and a boss 8 is hooked by a first hook and a second hook which are arranged on each segment of the arc-shaped fixing rod 7 respectively. The arc-shaped fixing rod 7 is firmly fixed by the protrusion, and the arc-shaped fixing rod 7 is not easy to fall off.
The arc dead lever can adopt the segmentation structure, and when adopting the segmentation structure, if one of them section arc dead lever 7 goes wrong, the arc dead lever 7 of other sections still can be fine restriction turbine outer loop 2's axial displacement, safe and reliable more has strengthened the spacing stability of 2 axial of turbine outer loops by a wide margin. Of course, the number of the protrusions can be a group, and the number of the opposite bosses 8 is two; the arc-shaped fixing rod 7 is of an integral structure, the arc-shaped fixing rod 7 penetrates through the groove, the boss 8 is hooked by the first hook and the second hook respectively to fix the arc-shaped fixing rod 7, and the arc-shaped fixing rod 7 is convenient to assemble and disassemble when adopting the integral structure and is simple and convenient to manufacture.
In the present exemplary embodiment, the fixing portion may also be a blind hole on the turbine casing 1, and the first bending rod disposed at one end of the arc-shaped fixing rod 7 extends into the blind hole; the second bending rod arranged at the other end of the arc-shaped fixed rod 7 also extends into the blind hole.
As described in detail herein, the groove formed in the turbine casing 1 is provided with blind holes, the first bending rod and the second bending rod of the arc-shaped fixing rod 7 respectively extend into the two blind holes, the blind holes and the annular groove 6 are not vertical structures, and have a slope, the first bending rod and the second bending rod on the arc-shaped fixing rod 7 generate friction with the inner wall of the blind holes, and the arc-shaped fixing rod 7 is fixed by the friction and the supporting force of the fragment on the arc-shaped fixing rod 7 so that the arc-shaped fixing rod 7 does not fall out of the annular groove 6; the number of the blind holes can be two, the arc-shaped fixing rods 7 are of an integral structure, the number of the blind holes can be more than two, the arc-shaped fixing rods 7 can be of a sectional structure, and the first bending rods and the second bending rods of each section of arc-shaped fixing rods 7 are respectively inserted into the blind holes to fix each section of arc-shaped fixing rods 7, namely, the arc-shaped fixing rods 7 are respectively fixed. When the segmented structure is adopted, if one section of the arc-shaped fixing rod 7 is in a problem, the other same structures can axially limit the outer ring 2 of the turbine, and the safety and reliability of the structure can be improved.
The bending rods can be bent in various modes, and the bending rods at two ends of the arc-shaped fixing rod 7 can be bent towards the direction close to the arc of the arc-shaped bending rod; the bending rods at the two ends of the arc-shaped bending rod can be bent towards the direction far away from the arc where the arc-shaped bending rod is located; one end of the blind hole can be bent towards the direction close to the arc of the arc-shaped bending rod, and the other end of the blind hole can be bent towards the direction far away from the arc of the arc-shaped bending rod, and the blind hole arranged in the annular groove 6 is matched with the bending rod.
In the present exemplary embodiment, when the segmented structure is adopted, the fixing portion may be a blind hole and a protrusion which are mixed for use; for example, the arc-shaped fixing rod 7 is divided into four sections, the first section and the third section are fixed by using the hook hooking protrusion of the arc-shaped fixing rod 7, the second section and the fourth section are fixed by using the bending rod inserting blind hole of the arc-shaped fixing rod 7, and the position relationship of each section can be interchanged, for example, the first section and the second section can be interchanged.
It should be noted that there are various ways to fix the arc-shaped fixing rod, two are listed here, and there are also various implementations, for example, the two ends of the arc-shaped fixing rod 7 are provided with fastening holes, and the protruding fastening holes provided on the axial side wall of the turbine casing 1 are used to fix the arc-shaped fixing rod 7, but the arc-shaped fixing rod 7 here may also be a segmented structure. The arc-shaped fixing rod is not particularly limited in this embodiment as long as it can be fixed. In this example embodiment, the arc-shaped fixing rod 7 may be a steel wire, and because the steel wire is installed between the turbine casing 1 and the turbine outer ring 2, the thermal expansion coefficients of the steel wire and the turbine outer ring 2 are substantially the same, the generated temperature stress is small and negligible, compared with the prior art, the steel wire has low cost and is easy to obtain, a large amount of cost can be saved, and the steel wire can be more stable and safer to perform axial limiting along with the turbine outer ring 2. In another embodiment, the arc-shaped fixing rod 7 may also be made of a material with good ductility, such as a metal material, a mixture of metal and carbon, and the like, which is not specifically limited in this exemplary embodiment; the material is easy to obtain, the manufacture is simple, the required process cost is low, and the method is safe, reliable and not easy to lose efficacy.
In the present exemplary embodiment, as shown with reference to fig. 3 and 4, the axial section of the arc-shaped fixing rod 7 may be circular; the cross-section of the corresponding annular groove 6 may be circular. When the cross sections of the arc-shaped fixing rod 7 and the annular groove 6 are circular, the radius of the axial cross section of the arc-shaped fixing rod 7 is only slightly smaller than that of the axial cross section of the groove. In another embodiment, the axial cross-section of the arc-shaped fixation rod may also be rectangular, trapezoidal or elliptical. The axial cross section of the annular groove 6 opposite thereto may also be rectangular, trapezoidal or oval.
In the above description, mainly for the details of the leftward axial limiting of the turbine outer ring 2, referring to fig. 2, the rightward axial limiting structure may include two annular baffles, a first baffle 101 and a second baffle 103, extending from the turbine casing 1 toward the turbine outer ring 2. The included angle between the annular baffle and the turbine casing 1 can be a right angle; the baffle is provided with an annular bending plate, the annular bending plate on the first baffle 101 is a first annular bending plate 102, and the annular bending plate on the second baffle 102 is a second annular bending plate 104. The baffle and the bent plate form an L-shaped structure, and form a limiting groove 107 with a leftward opening together with the outer wall of the turbine casing 1. Annular blocking plates, namely a first annular blocking plate 105 and a second annular blocking plate 106 are respectively arranged on the right sides of two axial side walls of the turbine outer ring 2. The two annular blocking plates are respectively clamped into the two limiting grooves 107 to complete the right axial limiting of the turbine outer ring 2.
It should be noted that the limitation on the right side of the turbine outer ring 2 can also be performed by using a limiting structure for axially limiting the left side of the turbine outer ring 2, and the limitation in the protection range should be understood as long as one side of the limiting structure for axially limiting the left side of the turbine outer ring 2 is used.
It should be noted that the above description is only for a section of the turbine outer ring 2. One skilled in the relevant art will appreciate that any one or more of the multiple segments of the turbine outer ring may employ the above-described limiting structure to axially limit the turbine outer ring.
Of course, the axial limiting manner of the multi-segment turbine outer ring 2 may be different, and any one or more segments of the multi-segment turbine outer ring may be understood as falling within the protection scope, as long as the above-mentioned axial limiting structure is adopted.
Further, the invention also provides a turbine engine, which comprises the axial limiting structure. The specific structure of the axial limiting structure has been described in detail above, and therefore, the detailed description thereof is omitted here.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments, and the features discussed in connection with the embodiments are interchangeable, if possible. In the above description, numerous specific details are provided to give a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.
Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". Other relative terms, such as "high", "low", "top", "bottom", "front", "back", "left", "right", etc., are also intended to have similar meanings. When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.
In this specification, the terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and are not limiting on the number of their objects.
It is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the description. The invention is capable of other embodiments and of being practiced and carried out in various ways. The foregoing variations and modifications fall within the scope of the present invention. It will be understood that the invention of the present specification and defined invention extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. All of these different combinations constitute alternative aspects of the present invention. The embodiments described in this specification illustrate the best mode known for carrying out the invention and will enable those skilled in the art to utilize the invention.
Claims (7)
1. An axial limit structure for preventing turbine outer ring axial displacement from disengaging from a turbine case, comprising:
an annular groove disposed in the turbine case;
the arc-shaped fixing rod is arranged in the annular groove and protrudes out of the annular groove to abut against the axial side wall of the turbine outer ring;
the fixing part is used for fixing the arc-shaped fixing rod;
wherein, the fixed part includes:
the bulge is arranged on the axial side wall of the outer ring of the turbine;
the first hook is arranged at one end of the arc-shaped fixed rod and hooks the protrusion;
the second hook is arranged at the other end of the arc-shaped fixed rod and hooks the protrusion; or
Be provided with the blind hole on the turbine casing, the fixed part includes:
the first bending rod is arranged at one end of the arc-shaped fixed rod and extends into the blind hole;
and the second bending rod is arranged at the other end of the arc-shaped fixed rod and extends into the blind hole.
2. The axial stop structure of claim 1,
the protrusion is arranged in a circular arc shape parallel to the annular groove.
3. The axial stop structure of claim 1,
the projection comprises two bosses arranged at intervals.
4. The axial stop structure of claim 1,
the arc-shaped fixing rod is made of the same material as the outer ring of the turbine.
5. The axial stop structure of claim 1,
the arc-shaped fixing rods are arranged in a plurality of groups, and the fixing parts are arranged in a plurality of groups.
6. The axial stop structure of claim 1,
the axial section of the arc-shaped fixed rod is one of a circle, a rectangle and a trapezoid; correspondingly, the axial section of the annular groove is one of a circle, a rectangle and a trapezoid.
7. A turbine engine, comprising:
an axial restraining structure according to any one of claims 1 to 6.
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| CN201811075684.6A CN109252902B (en) | 2018-09-14 | 2018-09-14 | Axial limiting structure and turbine engine |
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| CN201811075684.6A CN109252902B (en) | 2018-09-14 | 2018-09-14 | Axial limiting structure and turbine engine |
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| CN109252902B true CN109252902B (en) | 2021-09-07 |
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| CN109751088A (en) * | 2019-03-25 | 2019-05-14 | 中国船舶重工集团公司第七0三研究所 | A kind of connecting structure of block-type turbine outer ring for marine gas turbine |
| CN111042878B (en) * | 2019-12-30 | 2023-06-23 | 中国科学院工程热物理研究所 | Auxiliary force transmission casing structure of gas turbine |
| CN113062780B (en) * | 2021-05-06 | 2022-08-16 | 中国航发湖南动力机械研究所 | Turbine outer ring axial limit structure |
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| CN206513408U (en) * | 2017-01-23 | 2017-09-22 | 中国航发沈阳发动机研究所 | A kind of low-pressure turbine guide vane location structure and the engine with it |
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| CN109252902A (en) | 2019-01-22 |
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