CN110735672A - shunt ring and intermediate casing sector section structure with same - Google Patents

shunt ring and intermediate casing sector section structure with same Download PDF

Info

Publication number
CN110735672A
CN110735672A CN201910964804.6A CN201910964804A CN110735672A CN 110735672 A CN110735672 A CN 110735672A CN 201910964804 A CN201910964804 A CN 201910964804A CN 110735672 A CN110735672 A CN 110735672A
Authority
CN
China
Prior art keywords
edge
bearing
plate
force
overlapping
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201910964804.6A
Other languages
Chinese (zh)
Other versions
CN110735672B (en
Inventor
胡丹
钢铁
郑海亮
国睿
刘建明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AECC Shenyang Engine Research Institute
Original Assignee
AECC Shenyang Engine Research Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AECC Shenyang Engine Research Institute filed Critical AECC Shenyang Engine Research Institute
Priority to CN201910964804.6A priority Critical patent/CN110735672B/en
Publication of CN110735672A publication Critical patent/CN110735672A/en
Application granted granted Critical
Publication of CN110735672B publication Critical patent/CN110735672B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/24Casings; Casing parts, e.g. diaphragms, casing fastenings
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00Testing of machine parts

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

The application aspect provides a diverter ring including a load bearing plate having a plurality of inboard hydrostatic test ports thereon and having a th load bearing edge, a cover plate having a plurality of outboard hydrostatic test ports thereon and having a th overlapping edge, the th overlapping edge overlapping the th load bearing edge, a test space being formed between the load bearing plate and the cover plate, and a aspect provides a interposer cartridge segment structure having the diverter ring.

Description

shunt ring and intermediate casing sector section structure with same
Technical Field
The application belongs to the field of design of intermediate casing fan-shaped section structures, and particularly relates to an shunt ring and an intermediate casing fan-shaped section structure with the same.
Background
In a turbofan engine intermediate casing fan-shaped section blowing test, the static pressure distribution of the inner wall surface and the outer wall surface of a flow distribution ring needs to be measured, and dozens of static pressure test interfaces are usually required to be processed on the inner wall surface and the outer wall surface of the flow distribution ring to install static pressure test sensors according to performance requirements, so that the static pressure distribution of the inner wall surface and the outer wall surface of the flow distribution ring is measured.
The fan-shaped section structure of the traditional intermediary casing mainly comprises an inner and outer intermediary casing, a support plate and a shunt ring which are integrally cast or formed by machining bodies, wherein the shunt ring is of a solid structure, and a static pressure test interface is processed on the shunt ring with higher difficulty, so that a static pressure test sensor is difficult to install and leads of the static pressure test sensor are difficult to lead.
The present application is made in view of the above-mentioned drawbacks of the prior art.
Disclosure of Invention
It is an object of the present application to provide splitter rings and intermediate casing segment structures having the same that overcome or mitigate at least the deficiencies of the prior art.
The technical scheme of the application is as follows:
aspects provide a diverter ring comprising:
the bearing plate is provided with a plurality of inner static pressure test interfaces and an th bearing edge;
the cover plate is provided with a plurality of outer static pressure test interfaces and a lap joint edge, the lap joint edge is lapped on the bearing edge, and a test space is formed between the bearing plate and the cover plate.
According to at least embodiments of the present application, a sealant is applied between the th overlapping edge and the th force-bearing edge.
According to at least embodiments of the present application, the messenger plate has a second messenger edge opposite the th messenger edge;
the cover plate is provided with a cover plate protrusion, and the cover plate protrusion is connected to the second force bearing edge.
According to at least embodiments of the present application, the cover plate protrusion is bolted to the second messenger edge.
According to at least embodiments of the present application, the messenger panel has a third messenger edge, a fourth messenger edge opposite the third messenger edge, wherein the messenger edge extends between the third messenger edge and the fourth messenger edge;
the cover plate is provided with a third overlapping edge and a fourth overlapping edge opposite to the third overlapping edge, wherein the th overlapping edge extends between the third overlapping edge and the fourth overlapping edge, the third overlapping edge is overlapped on the third bearing edge, and the fourth overlapping edge is overlapped on the fourth bearing edge.
According to at least embodiments of the present application, a sealant is coated between the third overlapping edge and the third force-bearing edge;
and sealant is coated between the fourth lap joint edge and the fourth force bearing edge.
In another aspect , there is provided intermediate casing segment structures, comprising:
side panel;
a second side plate;
an arc-shaped intermediate outer casing, wherein the side of the arc-shaped intermediate outer casing is connected with the side plate, and the side of the arc-shaped intermediate outer casing is connected with the second side plate;
the arc-shaped intermediate inner casing is arranged on the inner side of the arc-shaped intermediate outer casing, the side of the arc-shaped intermediate inner casing is connected with the side plate, and the side of the arc-shaped intermediate inner casing is connected with the second side plate;
a support plate, wherein the end of the support plate is connected with the inner side of the arc-shaped intermediate outer casing, and the end of the support plate is connected with the outer side of the arc-shaped intermediate inner casing;
the splitter ring of any is located between the arc-shaped intermediate outer casing and the arc-shaped intermediate inner casing, the third bearing edge of the bearing plate is connected with the th side plate, and the fourth bearing edge of the bearing plate is connected with the second side plate.
According to at least embodiments of the present application, the th force-bearing edge of the splitter ring force-bearing plate is connected with the fulcrum plate.
Drawings
FIG. 1 is a schematic illustration of an intermediate casing segment configuration provided by an embodiment of the present application;
FIG. 2 is a cross-sectional view of an intermediate casing segment configuration provided by an embodiment of the present application;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
fig. 4 is a partial structural schematic view of a shunt ring provided in an embodiment of the present application;
wherein:
1-bearing plate, 2-cover plate, 3- th side plate, 4-second side plate, 5-arc intermediate outer casing, 6-arc intermediate inner casing, 7-support plate and 8-shunt ring.
Detailed Description
The present application is described in further detail below at with reference to the drawings and examples, it being understood that the specific examples described herein are for purposes of illustration only and are not intended to limit the application.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
It should be noted that in the description of the present application, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are for convenience of description only, and do not indicate or imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus are not to be construed as limiting the present application.
In addition, it should be noted that, unless otherwise expressly stated or limited in this specification, the terms "mounted," "connected," and "connected" shall be construed , and include, for example, fixed or removable connections or physical connections, mechanical or electrical connections, direct or indirect connections through intervening media, and communication between two elements.
The present application is further described in detail at with reference to fig. 1-4.
aspects provide a diverter ring comprising:
the bearing plate 1 is provided with a plurality of inner static pressure test interfaces and an th bearing edge;
the cover plate 2 is provided with a plurality of outer static pressure test interfaces and th lapping edges, the th lapping edge is lapped on the th bearing edge, and a test space is formed between the bearing plate 1 and the cover plate 2.
For the splitter ring disclosed in the above embodiments, those skilled in the art can understand that the splitter ring is formed by assembling the detachable bearing plate 1 and the detachable cover plate 2, the inner static pressure test interface on the bearing plate 1 and the outer static pressure test interface on the cover plate 2 can be processed before assembly, which is easy to implement, and the installation of the static pressure test sensor on the inner static pressure test interface and the outer static pressure test interface can be completed before assembly, which is fast and convenient, and a test space is formed between the bearing plate 1 and the cover plate 2, which is convenient for the lead wire of the static pressure test sensor.
In alternative embodiments, sealant is applied between the overlapping edge and the bearing edge to ensure sealing there.
In alternative embodiments, the bearing plate 1 has a second bearing edge opposite to the th bearing edge;
the cover plate 2 is provided with a cover plate protrusion which is connected to the second force-bearing edge.
In alternative embodiments, the cover plate protrusion is bolted to the second messenger edge.
In alternative embodiments, the messenger board 1 has a third messenger edge, a fourth messenger edge opposite the third messenger edge, wherein the messenger edge extends between the third messenger edge and the fourth messenger edge;
the cover plate 2 has a third overlapping edge, which overlaps the third force-bearing edge, and a fourth overlapping edge opposite the third overlapping edge, which overlaps the fourth force-bearing edge, wherein the th overlapping edge extends between the third overlapping edge and the fourth overlapping edge.
In alternative embodiments, a sealant is coated between the third overlapping edge and the third bearing edge to ensure the sealing;
and sealant is coated between the fourth lap joint edge and the fourth bearing edge to ensure the sealing of the position.
In another aspect , there is provided intermediate casing segment structures, comprising:
side panel 3;
a second side plate 4;
an arc-shaped intermediate outer casing 5, the side of which is connected with the side plate 3, and the side of which is connected with the second side plate 4;
an arc intermediate inner casing 6 disposed inside the arc intermediate outer casing 5, wherein the side thereof is connected to the side plate 3, and the side thereof is connected to the second side plate 4;
a support plate 7, wherein the end of the support plate is connected with the inner side of the arc-shaped intermediate outer casing 5, and the end of the support plate is connected with the outer side of the arc-shaped intermediate inner casing 6;
the splitter ring 8 of any is located between the arc-shaped intermediate outer casing 5 and the arc-shaped intermediate inner casing 6, the third bearing edge of the bearing plate 1 is connected with the side plate 3, and the fourth bearing edge of the bearing plate 1 is connected with the second side plate 4.
With respect to the intermediate casing segment structure disclosed in the above embodiments, it will be understood by those skilled in the art that the splitter ring 8 is detachably assembled with each of the parts.
In alternative embodiments, the bearing edge of the bearing plate 1 of the diverter ring 8 is connected with the bearing plate 7.
So far, the technical solutions of the present application have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present application is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the present application, and the technical scheme after the changes or substitutions will fall into the protection scope of the present application.

Claims (8)

1, diverter ring, comprising:
the bearing plate (1) is provided with a plurality of inner static pressure test interfaces and an th bearing edge;
the cover plate (2) is provided with a plurality of outer static pressure test interfaces and an th overlapping edge, the th overlapping edge is overlapped on the th force bearing edge, and a test space is formed between the force bearing plate (1) and the cover plate (2).
2. The diverter ring according to claim 1,
and a sealant is coated between the th lap joint edge and the th force bearing edge.
3. The diverter ring according to claim 1,
the bearing plate (1) is provided with a second bearing edge opposite to the th bearing edge;
the cover plate (2) is provided with a cover plate protrusion, and the cover plate protrusion is connected to the second force bearing edge.
4. The diverter ring according to claim 3,
the cover plate is connected to the second force-bearing edge in a protruding mode through bolts.
5. The diverter ring according to claim 1,
the bearing plate (1) is provided with a third bearing edge and a fourth bearing edge opposite to the third bearing edge, wherein the bearing edge extends between the third bearing edge and the fourth bearing edge;
the cover plate (2) is provided with a third overlapping edge and a fourth overlapping edge opposite to the third overlapping edge, wherein the th overlapping edge extends between the third overlapping edge and the fourth overlapping edge, the third overlapping edge is overlapped on the third bearing edge, and the fourth overlapping edge is overlapped on the fourth bearing edge.
6. The diverter ring according to claim 5,
a sealant is coated between the third lap joint edge and the third bearing edge;
and a sealant is coated between the fourth lap joint edge and the fourth force bearing edge.
An intermediate casing segment structure of the type 7, , comprising:
th side panel (3);
a second side plate (4);
an arc-shaped intermediate outer casing (5) having an side connected to the side plate (3) and a side connected to the second side plate (4);
an arc intermediate inner casing (6) disposed inside the arc intermediate outer casing (5), wherein the side of the arc intermediate inner casing is connected with the side plate (3), and the side of the arc intermediate inner casing is connected with the second side plate (4);
a strut (7) having an end connected to the inside of the arcuate intermediate outer casing (5) and a end connected to the outside of the arcuate intermediate inner casing (6);
the diverter ring (8) according to any of claims 1-6, located between the curved intermediate outer casing (5) and the curved intermediate inner casing (6), wherein the third force-bearing edge of the force-bearing plate (1) is connected to the side plate (3), and the fourth force-bearing edge of the force-bearing plate (1) is connected to the second side plate (4).
8. The intermediate case segment structure of claim 7, wherein,
the th bearing edge of the bearing plate (1) of the shunting ring (8) is connected with the bearing plate (7).
CN201910964804.6A 2019-10-11 2019-10-11 Shunt ring and intermediate casing fan-shaped section structure with same Active CN110735672B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910964804.6A CN110735672B (en) 2019-10-11 2019-10-11 Shunt ring and intermediate casing fan-shaped section structure with same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910964804.6A CN110735672B (en) 2019-10-11 2019-10-11 Shunt ring and intermediate casing fan-shaped section structure with same

Publications (2)

Publication Number Publication Date
CN110735672A true CN110735672A (en) 2020-01-31
CN110735672B CN110735672B (en) 2021-10-22

Family

ID=69269912

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910964804.6A Active CN110735672B (en) 2019-10-11 2019-10-11 Shunt ring and intermediate casing fan-shaped section structure with same

Country Status (1)

Country Link
CN (1) CN110735672B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112648026A (en) * 2020-12-16 2021-04-13 中国航发沈阳发动机研究所 Intermediary cartridge receiver structure
CN113864239A (en) * 2021-10-27 2021-12-31 中国航发沈阳发动机研究所 Double-duct aero-engine high-low pressure gas engine and intermediate casing part thereof
FR3118784A1 (en) * 2021-01-08 2022-07-15 Safran Aircraft Engines Turbomachine assembly for turbofan aircraft comprising a nozzle downstream of the arms of an intermediate casing

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102094711A (en) * 2011-01-04 2011-06-15 北京航空航天大学 Device for measuring total pressure and total temperature of air flow at inlet of aeromotor
RU2454646C1 (en) * 2011-02-02 2012-06-27 Федеральное государственное унитарное предприятие "Центральный аэрогидродинамический институт имени профессора Н.Е. Жуковского" (ФГУП "ЦАГИ") Universal elastic-like aerodynamic model and method of making said model
WO2012122669A1 (en) * 2011-03-14 2012-09-20 General Electric Company Wind turbine blades with air pressure sensors
CN202599664U (en) * 2011-11-25 2012-12-12 中国航空工业集团公司沈阳发动机设计研究所 Device for arranging test points on shunting ring of engine fan test-piece intermediate case
CN103134685A (en) * 2011-11-25 2013-06-05 中国航空工业集团公司沈阳发动机设计研究所 Testing and stationing device of shunting ring of intermediate casing of fan test piece of engine
US20130139578A1 (en) * 2011-12-01 2013-06-06 Rolls-Royce Deutschland Ltd & Co Kg Pressure-measuring device and pressure-measuring method for a turbomachine
US20130145836A1 (en) * 2011-12-12 2013-06-13 Thales Probe for Measuring a Local Angle of Attack and Method Implementing Same
US20140130611A1 (en) * 2008-11-14 2014-05-15 Kulite Semiconductor Products, Inc. Pressure transducer structures suitable for curved surfaces
CN103900783A (en) * 2014-03-10 2014-07-02 广东省建筑科学研究院 Scale model test platform for large space airflow distribution
CN203772516U (en) * 2014-04-14 2014-08-13 重庆科技学院 Wind tunnel test wind speed testing device
CN104132811A (en) * 2014-05-04 2014-11-05 中国航天空气动力技术研究院 Ramjet air inlet starting hysteresis characteristics test device
CN205228771U (en) * 2015-11-13 2016-05-11 中国空气动力研究与发展中心低速空气动力研究所 Experimental minute -pressure measurement system in low speed wind tunnel flow field
CN106002103A (en) * 2016-06-22 2016-10-12 湖北三江航天江北机械工程有限公司 Forming method for iron-based high-temperature alloy distributing ring
CN106989929A (en) * 2017-04-19 2017-07-28 中国航发沈阳发动机研究所 A kind of high-pressure compressor testpieces structure
CN206647184U (en) * 2017-04-07 2017-11-17 中国航发沈阳发动机研究所 For filling the cover plate in engine by-pass air duct gap
CN109520741A (en) * 2018-10-29 2019-03-26 中国航发沈阳发动机研究所 A kind of aeroengine combustor buring room casing pressure experimental device

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140130611A1 (en) * 2008-11-14 2014-05-15 Kulite Semiconductor Products, Inc. Pressure transducer structures suitable for curved surfaces
CN102094711A (en) * 2011-01-04 2011-06-15 北京航空航天大学 Device for measuring total pressure and total temperature of air flow at inlet of aeromotor
RU2454646C1 (en) * 2011-02-02 2012-06-27 Федеральное государственное унитарное предприятие "Центральный аэрогидродинамический институт имени профессора Н.Е. Жуковского" (ФГУП "ЦАГИ") Universal elastic-like aerodynamic model and method of making said model
CN103443454A (en) * 2011-03-14 2013-12-11 通用电气公司 Wind turbine blade with air pressure sensors
WO2012122669A1 (en) * 2011-03-14 2012-09-20 General Electric Company Wind turbine blades with air pressure sensors
CN103134685A (en) * 2011-11-25 2013-06-05 中国航空工业集团公司沈阳发动机设计研究所 Testing and stationing device of shunting ring of intermediate casing of fan test piece of engine
CN202599664U (en) * 2011-11-25 2012-12-12 中国航空工业集团公司沈阳发动机设计研究所 Device for arranging test points on shunting ring of engine fan test-piece intermediate case
US20130139578A1 (en) * 2011-12-01 2013-06-06 Rolls-Royce Deutschland Ltd & Co Kg Pressure-measuring device and pressure-measuring method for a turbomachine
US20130145836A1 (en) * 2011-12-12 2013-06-13 Thales Probe for Measuring a Local Angle of Attack and Method Implementing Same
CN103900783A (en) * 2014-03-10 2014-07-02 广东省建筑科学研究院 Scale model test platform for large space airflow distribution
CN203772516U (en) * 2014-04-14 2014-08-13 重庆科技学院 Wind tunnel test wind speed testing device
CN104132811A (en) * 2014-05-04 2014-11-05 中国航天空气动力技术研究院 Ramjet air inlet starting hysteresis characteristics test device
CN205228771U (en) * 2015-11-13 2016-05-11 中国空气动力研究与发展中心低速空气动力研究所 Experimental minute -pressure measurement system in low speed wind tunnel flow field
CN106002103A (en) * 2016-06-22 2016-10-12 湖北三江航天江北机械工程有限公司 Forming method for iron-based high-temperature alloy distributing ring
CN206647184U (en) * 2017-04-07 2017-11-17 中国航发沈阳发动机研究所 For filling the cover plate in engine by-pass air duct gap
CN106989929A (en) * 2017-04-19 2017-07-28 中国航发沈阳发动机研究所 A kind of high-pressure compressor testpieces structure
CN109520741A (en) * 2018-10-29 2019-03-26 中国航发沈阳发动机研究所 A kind of aeroengine combustor buring room casing pressure experimental device

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
刘长春等: "某型航空发动机中介机匣分流环插接安装的脱开失效载荷分析", 《航空发动机》 *
向宏辉等: "进气条件对压气机中介机匣流场影响的试验研究", 《燃气涡轮试验与研究》 *
邓小明: "风扇/压气机分流环设计优化研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 *
陈恩杰等: "支板厚度对双涵道中介机匣特性的影响", 《中国航天第三专业信息网第四十届技术交流会暨第四届空天动力联合会议论文集》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112648026A (en) * 2020-12-16 2021-04-13 中国航发沈阳发动机研究所 Intermediary cartridge receiver structure
FR3118784A1 (en) * 2021-01-08 2022-07-15 Safran Aircraft Engines Turbomachine assembly for turbofan aircraft comprising a nozzle downstream of the arms of an intermediate casing
CN113864239A (en) * 2021-10-27 2021-12-31 中国航发沈阳发动机研究所 Double-duct aero-engine high-low pressure gas engine and intermediate casing part thereof

Also Published As

Publication number Publication date
CN110735672B (en) 2021-10-22

Similar Documents

Publication Publication Date Title
CN110735672A (en) shunt ring and intermediate casing sector section structure with same
US7891165B2 (en) Exhaust casing hub comprising stress-distributing ribs
US10519806B2 (en) Turbine housing
CN106640233B (en) A kind of heat-insulated runner of turbine support case and the engine with it
CA2680005A1 (en) Actuator for vehicle
US10047618B2 (en) Component system of a turbo engine
KR101464422B1 (en) Sealing mechanism using accordioned bellows, and steam turbine provided with said sealing mechanism
CN208885631U (en) A kind of detachable diffuser structure
US10689996B2 (en) Turbomachine blade fitted with an elastomer gasket
US4105062A (en) Two-stage regenerator seal
CN1329633C (en) Composite tubular woven seal for steam turbine diaphragm horizontal joint interfaces
CN102996188A (en) Turbine casing assembly mounting pin
CN115434760A (en) Sealing structure between stator blade and rotating shaft in aircraft engine
CN212154872U (en) Fan component mounting structure and sealing strip thereof
CN106275270B (en) A kind of towing cable machine cylinder
CN207648131U (en) Gland
CN209494832U (en) Spline device, solid splined shaft and hollow splined shaft
US20150071764A1 (en) Turbocompound Bearing for Attaching a Turbocompound System to an Internal Combustion Engine
CN205275636U (en) Screens combined type electric arc furnace furnace roof prefab
CN116104594A (en) Aeroengine intermediate case structure
CN217633859U (en) Anticorrosive wear-resisting sealing member
CN108050252A (en) Gland
CN109611216A (en) A kind of gear-box erecting by overhang
EP3802393B1 (en) Hydraulic rotator apparatus
CN216198929U (en) Flange connecting structure for water pump

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant