CN202994468U - Lubricating oil test device - Google Patents

Lubricating oil test device Download PDF

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Publication number
CN202994468U
CN202994468U CN 201220399862 CN201220399862U CN202994468U CN 202994468 U CN202994468 U CN 202994468U CN 201220399862 CN201220399862 CN 201220399862 CN 201220399862 U CN201220399862 U CN 201220399862U CN 202994468 U CN202994468 U CN 202994468U
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CN
China
Prior art keywords
test
pipe adapter
lubricating oil
installation portion
flow rate
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.)
Expired - Fee Related
Application number
CN 201220399862
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Chinese (zh)
Inventor
张红丽
钱小燕
盛波
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 South Industry Co Ltd
Original Assignee
China National South Aviation Industry Co Ltd
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 China National South Aviation Industry Co Ltd filed Critical China National South Aviation Industry Co Ltd
Priority to CN 201220399862 priority Critical patent/CN202994468U/en
Application granted granted Critical
Publication of CN202994468U publication Critical patent/CN202994468U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model provides a lubricating oil test device. The lubricating oil test device comprises a body, a flow direction test pipe joint and a flow test pipe joint, wherein the body comprises an installing part, the installing part comprises a first test hole communicated with an oil outlet of a tested part, and the flow direction test pipe joint and the flow test pipe joint can be arranged on the body selectively correspondingly to the first test hole. The flow direction test pipe joint and the flow test pipe joint can be arranged on the lubricating oil test device of the utility model selectively, and the lubricating oil test device can carry out not only the flow direction test but also the flow test, so that the problem is avoided that in order to carry out the flow direction test and the flow test, two sets of devices are designed respectively, so that the production cost is high and the production efficiency is low. The lubricating oil test device is high in integration level and convenient in operation.

Description

The lubricating oil test unit
Technical field
The utility model relates to a kind of lubricating oil test unit.
Background technology
Can the lubricated and fuel system of aeromotor work and directly affect serviceability and the serviceable life of engine, and the most effective detection methods carries out flow, the flow direction and leakage test to its associated components exactly.
All the time, the flow direction, flow and leakage test fixture be design respectively all, and part will be completed the flow direction, flow, leakage test will be used three cover frocks namely needs clamping three times.Such operation is time and effort consuming but also increased the production costs such as frock manufacturing and test not only.
The utility model content
The lubricating oil test unit that provides a kind of integrated level high and easy to operate is provided the utility model purpose.
The utility model provides a kind of lubricating oil test unit, comprising: body, comprise installation portion, and installation portion has the first instrument connection, and the first instrument connection is connected with the oil outlet of tested part; Flow to the testing tube joint; The flow rate test pipe adapter; Wherein, flowing to corresponding the first instrument connection of testing tube joint and flow rate test pipe adapter selectively is arranged on body.
Further, also comprise: the sealing test pipe adapter is arranged on installation portion; The sealing test pipe adapter be arranged on installation portion on and be connected with the second instrument connection that the oil supply hole of tested part is connected.
Further, installation portion also comprises: the sealing test pipe box, be arranged on projectedly on installation portion, and be formed with the sealing test canister aperture in the sealing test pipe box; Wherein, the sealing test pipe adapter is arranged in the sealing test canister aperture.
Further, body also comprises: baffle plate, and first end is connected with installation portion, and the second end bends with respect to first end and deviates from installation portion; Baffle plate has the pipe adapter mounting hole, flows to the testing tube joint or the flow rate test pipe adapter is slidably disposed in the pipe adapter mounting hole.
Further, baffle plate comprises: the first screw, be arranged on the hole wall of pipe adapter mounting hole, and be used for fixed flow to testing tube joint or flow rate test pipe adapter.
Further, also comprise: base removably is connected with body.
Further, flowing to the testing tube joint has: the first asphalt channel; The first locating part is arranged on the outer wall of the first asphalt channel projectedly, and restriction flows to the testing tube joint and stretches into length in the pipe adapter mounting hole.
Further, the flow rate test pipe adapter has: the second asphalt channel; The second locating part is arranged on the outer wall of the second asphalt channel projectedly, the position of limited flow testing tube joint in the pipe adapter mounting hole.
Further, the sealing test pipe adapter has: the 3rd asphalt channel; The 3rd locating part is arranged on the outer wall of the 3rd asphalt channel projectedly, the restriction position of sealing test pipe adapter in the sealing test canister aperture; O-ring seal is arranged on the 3rd locating part and between the 3rd locating part and sealing test canister aperture; Wherein, the outer wall of sealing test pipe adapter has screw thread, is spirally connected with the sealing test canister aperture.
Further, installation portion also comprises: a plurality of the first register pins, and installation portion is located tested part by a plurality of the first register pins; A plurality of the second screws, installation portion is fixed on tested part on installation portion by a plurality of the second screws.
According to lubricating oil test unit of the present utility model, flowing to testing tube joint and flow rate test pipe adapter selectively is arranged on this lubricating oil test unit, this device not only can flow to test but also can carry out flow rate test, has avoided designing respectively two covering devices and causing production cost height and the low problem of production efficiency for flowing to test and flow rate test.Lubricating oil test unit integrated level of the present utility model is high and easy to operate.
Description of drawings
The accompanying drawing that consists of the application's a part is used to provide further understanding of the present utility model, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not consist of improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the one-piece construction schematic diagram according to lubricating oil test unit of the present utility model;
Fig. 2 is that the A-A of Fig. 1 is to sectional view;
Fig. 3 is the structural representation that flows to the oil guide pipe joint according to lubricating oil test unit of the present utility model;
Fig. 4 is the structural representation according to the flow oil guide pipe joint of lubricating oil test unit of the present utility model;
Fig. 5 is the structural representation that is sealed into tubing sub according to lubricating oil test unit of the present utility model.
Fig. 6 is the front elevation according to the installation portion of lubricating oil test unit of the present utility model;
Fig. 7 is that the B-B of Fig. 6 is to sectional view;
Fig. 8 is the front elevation according to the baffle plate of lubricating oil test unit of the present utility model;
Fig. 9 is that the C-C of Fig. 8 is to sectional view;
Figure 10 is the front elevation according to the base of lubricating oil test unit of the present utility model; And
Figure 11 is that the D-D of Figure 10 is to sectional view.
Embodiment
Describe below with reference to the accompanying drawings and in conjunction with the embodiments the utility model in detail.
As Fig. 1, Fig. 3 and shown in Figure 4, the utility model provides a kind of lubricating oil test unit, and this lubricating oil test unit comprises body 10, flows to testing tube joint 20 and flow rate test pipe adapter 30.
As shown in Figure 2, body 10 comprises installation portion 11, has the first instrument connection 111, the first instrument connections 111 and be connected with the oil outlet of tested part on installation portion 11, can be used as the passage of oil.The lubricating oil test unit also comprise as shown in Figure 3 flow to testing tube joint 20 and flow rate test pipe adapter 30 as shown in Figure 4.Flowing to corresponding the first instrument connection 111 of testing tube joint 20 and flow rate test pipe adapter 30 selectively is arranged on body 10.Particularly, flow to testing tube joint 20, be used for flowing to test, and directly be not connected with the first instrument connection 111, have certain predeterminable range.Flow rate test pipe adapter 30 is used for carrying out flow rate test, and directly is not connected with the first instrument connection 111, has certain predeterminable range.Predeterminable range is the accuracy for the requirement that guarantees to test and test result.Carry out respectively owing to flowing to test and flow rate test, and need to flow to testing tube joint 20 and flow rate test pipe adapter 30 and coordinate respectively test just can complete with the first instrument connection 111, be not arranged on simultaneously on installation portion 11 and test so flow to testing tube joint 20 and flow rate test pipe adapter 30, need selectively rotation to carry out.
Lubricating oil test unit of the present utility model, can flow to respectively test and flow rate test, flow to testing tube joint 20 and flow rate test pipe adapter 30 for flowing to test and flow rate test rotation setup and use on the lubricating oil test unit, avoided designing respectively two and overlapping proving installations and cause production cost height and the low problem of production efficiency for flowing to test and flow rate test.Lubricating oil test unit integrated level of the present utility model is high and easy to operate.
As shown in Figure 5, also be provided with sealing test pipe adapter 40 on the installation portion 11 of lubricating oil test unit, for use in carrying out sealing test.As shown in Figure 2, be provided with the second instrument connection 112 that is connected with the oil supply hole of tested part on installation portion 11, sealing test pipe adapter 40 is connected with the second instrument connection 112.The above-mentioned design of the present embodiment makes the lubricating oil test unit can flow to respectively test, flow rate test and sealing test, has realized a function that device can carry out three tests, has improved work efficiency.
As shown in Figure 6 and Figure 7, also be provided with sealing test pipe box 117 on installation portion 11, sealing test pipe box 117 is arranged on installation portion 11 projectedly, forms promising sealing test canister aperture 113 in sealing test pipe box 117.Sealing test pipe adapter 40 is arranged in sealing test canister aperture 113, and better effects and if then the test result of sealing are more accurate.
As Fig. 2, Fig. 8 and shown in Figure 9, body 10 also comprises baffle plate 12, is arranged on baffle plate 12 and tests in order to will flow to testing tube joint 20 or flow rate test pipe adapter 30.The first end of baffle plate 12 is connected with installation portion 11, and the second end of baffle plate 12 bends with respect to first end and deviates from installation portion 11, and the second end of baffle plate 12 is not connected with installation portion 11 and has certain distance.Baffle plate 12 passes through the second register pin 123 behind location on installation portion 11, then uses the 3rd screw 124 fastening.
Baffle plate 12 has pipe adapter mounting hole 121, pipe adapter mounting hole 121 is used for arranging flowing to testing tube joint 20 or flow rate test pipe adapter 30, flows to testing tube joint 20 in the present embodiment or flow rate test pipe adapter 30 is slidably disposed in pipe adapter mounting hole 121.Preferably, the connected mode that flows to testing tube joint 20 or flow rate test pipe adapter 30 and pipe adapter mounting hole 121 is designed to the gap sliding fit, is convenient to like this dismounting and change and flows to testing tube joint 20 or flow rate test pipe adapter 30.
As shown in Figure 1, baffle plate 12 comprises that the first screw 122, the first screws 122 are arranged on the hole wall of pipe adapter mounting hole 121, screws the first screw 122 and can be used for fixing and hold out against and flow to testing tube joint 20 or flow rate test pipe adapter 30.Assurance flows to testing tube joint 20 or flow rate test pipe adapter 30 position when test is accurate, and the test effect is accurate.
As Fig. 2, Figure 10 and shown in Figure 11, installation portion 11 also comprises base 50.Base 50 can be designed as trapezoidal, and body 10 is arranged on can more stablize on base 50 and is difficult for biasing.Preferably, base 50 removably is connected with body 10, as connecting by a plurality of the 4th screws 116.Be designed to removably the connection side keep in repair, change, transport and store these parts.
Flow to testing tube joint 20 and be used for flowing to test.Flowing to test is to check that the direction of the oil column that is ejected by oil outlet under certain pressure reaches the emission state of oil column in a certain segment distance scope.In test, preferably, flow between testing tube joint 20 and pipe adapter mounting hole 121 and be designed to the gap sliding fit, and then hold out against with the first screw 122.As shown in Figure 3, flow to testing tube joint 20 and have the first asphalt channel 21, but fuel feeding passes through.Flow on the outer wall of testing tube joint 20 and be provided with projectedly the first locating part 22, restriction flows to testing tube joint 20 and stretches into length in pipe adapter mounting hole 121, in order to guarantee the accuracy of test effect.Particularly, the second end of baffle plate 12 is not connected with installation portion 11 and has certain distance, preferably, and the satisfied distance that flows to test 2.07 when testing tube joint 20 is close to baffle plate 12 that flows to of this distance.For satisfying technological requirement, the diameter that flows to the oil receiving hole footpath of testing tube joint 20 is 3mm.
Flow rate test pipe adapter 30 is used for flow rate test.Flow refer to the to flow through oil volume of oil outlet within the unit interval.In test, preferably, be designed to the gap sliding fit between flow rate test pipe adapter 30 and pipe adapter mounting hole 121, and then hold out against with the first screw 122.As shown in Figure 4, flow rate test pipe adapter 30 has the second asphalt channel 31, but fuel feeding passes through.Be provided with projectedly the second locating part 32 on the outer wall of flow rate test pipe adapter 30, the position of limited flow testing tube joint 30 in pipe adapter mounting hole 121 is in order to guarantee the accuracy of test effect.
Flow is had any different with the fuel-displaced oil pipe that connects that flows to test, therefore in above-described embodiment, designed respectively and flowed to testing tube joint 20 and flow rate test pipe adapter 30 and flow to test and flow rate test, and in order to change the convenience that flows to testing tube joint 20 and flow rate test pipe adapter 30 and the accuracy of location thereof, adopted the structure of baffle plate 12 spacings and gapless sliding fit and further fixed and hold out against with the first screw 122 flowing to testing tube joint 20 and flow rate test pipe adapter 30.
Sealing test pipe adapter 40 is used for sealing test.Sealing test is exactly to check whether shell and union piece thereof have the ability that stops the inside and outside gas of housing or liquid to exchange.The utility model utilizes working gas or liquid check seal degree, by the pressure of technical stipulation, the original foundation that the time is the selection check method.As shown in Figure 5, sealing test pipe adapter 40 has the 3rd asphalt channel 41, but fuel feeding passes through.Be provided with projectedly the 3rd locating part 42 on the outer wall of sealing test pipe adapter 40, the position of restriction sealing test pipe adapter 40 in sealing test canister aperture 113 is in order to guarantee the accuracy of test effect.Be provided with O-ring seal 43 on the 3rd locating part 42, and O-ring seal 43 is between the 3rd locating part 42 and sealing test canister aperture 113.The outer wall of sealing test pipe adapter 40 has screw thread, is spirally connected with sealing test canister aperture 113, and sealing effectiveness is better, and test result is more accurate.The 3rd locating part 42 rings are located on the outer wall of sealing test pipe adapter 40, are provided with O-ring seal 43 on the side of the 3rd locating part 42 that contacts with sealing test canister aperture 113.When sealing test pipe adapter 40 is threaded in sealing test canister aperture 113, the 3rd locating part 42 and sealing test canister aperture 113 close contacts, sealing test canister aperture 113 has also just been oppressed the O-ring seal 43 on the 3rd locating part 42 when holding out against with the 3rd locating part 42, until sealing function is played in O-ring seal 43 plastic yield.O-ring seal 43 plays sealing function, makes test result more accurate.
As depicted in figs. 1 and 2, installation portion 11 also comprises a plurality of the first register pins 114 and a plurality of the second screw 115.Installation portion 11 is by a plurality of the first register pin 114 location tested parts, and installation portion 11 is fixed on tested part on installation portion 11 by a plurality of the second screws 115.First locate with 114 pairs of tested parts of the first register pin, then be fixed with 115 pairs of tested parts of the second screw.Guaranteed the accurately relative position of lubricating oil test unit of the present utility model when tested part is tested.
The lubricating oil test unit that preferred embodiment of the present utility model provides is the lubricating oil test unit of afflux to test, flow rate test and sealing test unification.Concrete operations are as follows: tested part is arranged on installation portion 11, first locates with 114 pairs of tested parts of the first register pin, then be fixed with 115 pairs of tested parts of the second screw, then begin to test.In the time will flowing to test, load onto in pipe adapter mounting hole 121 in baffle plate 12 on installation portion 11 and compress by the first screw 122 flowing to testing tube joint 20, flowing to the diameter that satisfies the distance that flows to test 2.07 when testing tube joint 20 is close to baffle plate 12 and flow to testing tube joint 20 this moment and be the technological requirement in the oil receiving hole footpath of 3mm.In the time will carrying out flow rate test, change flow rate test pipe adapter 30 again with the first screw 122 compressions as long as unclamp the first screw 122, the oil receiving hole of flow rate test pipe adapter 30 enlarges at this moment, and pipe shaft lengthens, and farthest the oil outlet near tested part connects oil.When carrying out sealing test, available rubber plug is blocked the oil outlet of tested part, connects sealing test pipe adapter 40 at the oil supply hole place of tested part, and this sealing test pipe adapter 40 is complementary with the pump nozzle of sealing test lathe, namely can carry out sealing test.Especially, when tested part is disk-shaped assembly, for example to three labyrinth gas seals ring assemblies flow to, flow, sealing test.There are two parts in the hole that will measure due to this tested part and for symmetrical, for easy to operate, can be designed to 0.005~0.01 gap sliding fit between the installation portion 11 with the first register pin 114 and lubricating oil test unit, survey again another half of hole after extracting the first register pin 114 Rotate 180s ° after having surveyed.
In above preferred embodiment, the various accessory sizes in the lubricating oil test unit can be adjusted by the size of the tested part of reality.
Can the lubricated and fuel system of aeromotor work and directly affect serviceability and the serviceable life of engine, therefore the engine product design has proposed clear and definite technical requirement to size and the shaped position of each oil circuit nozzle, its inspection item comprises outward appearance, size, technical conditions etc., and the projects that affect the nozzle performance test are strictly controlled in the checkout procedure of machining and finished product.Wherein, the turnover oil-hole location must be guaranteed by unit clamp or measurer, again because of the oil duct complex distribution, especially the oil duct in the thin-wall case such as weldment and casing, the situations such as broken wall or seepage often appear, thus the most effective detection methods exactly to its flow to, flow distribution and sealing test.The lubricating oil test unit that the utility model provides is particularly useful for above-mentioned engine product design to the flow direction, flow and three performance tests of sealing of each oil circuit nozzle.
As can be seen from the above description, the utility model the above embodiments have realized following technique effect:
1, the integrated level of lubricating oil test unit is high, this device can be respectively to tested part flow to, flow and three tests of sealing;
2, time saving and energy saving, save production cost, increase work efficiency;
3, easy to operate.
The above is only preferred embodiment of the present utility model, is not limited to the utility model, and for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims (10)

1. a lubricating oil test unit, is characterized in that, comprising:
Body (10) comprises installation portion (11), and described installation portion (11) has the first instrument connection (111), and described the first instrument connection (111) is connected with the oil outlet of tested part;
Flow to testing tube joint (20);
Flow rate test pipe adapter (30);
Wherein, described corresponding described the first instrument connection of testing tube joint (20) or described flow rate test pipe adapter (30) (111) that flows to is arranged on described body (10).
2. lubricating oil test unit according to claim 1, is characterized in that, also comprises:
Sealing test pipe adapter (40) is arranged on described installation portion (11);
Described sealing test pipe adapter (40) be arranged on described installation portion (11) on and be connected with the second instrument connection (112) that the oil supply hole of described tested part is connected.
3. lubricating oil test unit according to claim 2, is characterized in that, described installation portion (11) also comprises:
Sealing test pipe box (117) is arranged on described installation portion (11) projectedly, is formed with sealing test canister aperture (113) in described sealing test pipe box (117);
Wherein, described sealing test pipe adapter (40) is arranged in described sealing test canister aperture (113).
4. lubricating oil test unit according to claim 1, is characterized in that, described body (10) also comprises:
Baffle plate (12), first end is connected with described installation portion (11), and the second end bends with respect to described first end and deviates from described installation portion (11);
Described baffle plate (12) has pipe adapter mounting hole (121), describedly flows to testing tube joint (20) or described flow rate test pipe adapter (30) is slidably disposed in described pipe adapter mounting hole (121).
5. lubricating oil test unit according to claim 4, is characterized in that, described baffle plate (12) comprising:
The first screw (122) is arranged on the hole wall of described pipe adapter mounting hole (121), is used for fixing described testing tube joint (20) or the flow rate test pipe adapter (30) of flowing to.
6. lubricating oil test unit according to claim 1, is characterized in that, also comprises: base (50) removably is connected with described body (10).
7. lubricating oil test unit according to claim 4, is characterized in that, the described testing tube joint (20) that flows to has:
The first asphalt channel (21);
The first locating part (22) is arranged on the outer wall of described the first asphalt channel (21) projectedly, limits the described testing tube joint (20) that flows to and stretches into length in described pipe adapter mounting hole (121).
8. lubricating oil test unit according to claim 4, is characterized in that, described flow rate test pipe adapter (30) has:
The second asphalt channel (31);
The second locating part (32) is arranged on the outer wall of described the second asphalt channel (31) projectedly, limits the position of described flow rate test pipe adapter (30) in described pipe adapter mounting hole (121).
9. lubricating oil test unit according to claim 3, is characterized in that, described sealing test pipe adapter (40) has:
The 3rd asphalt channel (41);
The 3rd locating part (42) is arranged on the outer wall of described the 3rd asphalt channel (41) projectedly, limits the position of described sealing test pipe adapter (40) in described sealing test canister aperture (113);
O-ring seal (43) is arranged on described the 3rd locating part (42) upward and is positioned between described the 3rd locating part (42) and described sealing test canister aperture (113);
Wherein, the outer wall of described sealing test pipe adapter (40) has screw thread, is spirally connected with described sealing test canister aperture (113).
10. lubricating oil test unit according to claim 1, is characterized in that, described installation portion (11) also comprises:
A plurality of the first register pins (114), described installation portion (11) is located described tested part by a plurality of described the first register pins (114);
A plurality of the second screws (115), described installation portion (11) is fixed on described tested part on described installation portion (11) by a plurality of described the second screws (115).
CN 201220399862 2012-08-13 2012-08-13 Lubricating oil test device Expired - Fee Related CN202994468U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220399862 CN202994468U (en) 2012-08-13 2012-08-13 Lubricating oil test device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220399862 CN202994468U (en) 2012-08-13 2012-08-13 Lubricating oil test device

Publications (1)

Publication Number Publication Date
CN202994468U true CN202994468U (en) 2013-06-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201220399862 Expired - Fee Related CN202994468U (en) 2012-08-13 2012-08-13 Lubricating oil test device

Country Status (1)

Country Link
CN (1) CN202994468U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105547663A (en) * 2015-12-04 2016-05-04 中国南方航空工业(集团)有限公司 Bearing simulator flow direction test clamp
CN106441900A (en) * 2016-08-29 2017-02-22 中航动力股份有限公司 Lubricating oil pressure difference false alarm fault point searching method
CN114046997A (en) * 2021-11-10 2022-02-15 中国航发南方工业有限公司 Aeroengine case lubricating oil flow test fixture

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105547663A (en) * 2015-12-04 2016-05-04 中国南方航空工业(集团)有限公司 Bearing simulator flow direction test clamp
CN105547663B (en) * 2015-12-04 2018-07-20 中国南方航空工业(集团)有限公司 Bearing SIMULATOR flux and flow direction test fixture
CN106441900A (en) * 2016-08-29 2017-02-22 中航动力股份有限公司 Lubricating oil pressure difference false alarm fault point searching method
CN106441900B (en) * 2016-08-29 2019-03-01 中航动力股份有限公司 A kind of fault point lookup method of lubricating oil pressure difference false alarm
CN114046997A (en) * 2021-11-10 2022-02-15 中国航发南方工业有限公司 Aeroengine case lubricating oil flow test fixture

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C14 Grant of patent or utility model
GR01 Patent grant
CP01 Change in the name or title of a patent holder

Address after: 412002 Dong Jiaduan, Zhuzhou, Hunan

Patentee after: China Hangfa South Industrial Co. Ltd.

Address before: 412002 Dong Jiaduan, Zhuzhou, Hunan

Patentee before: China Southern Airlines Industry (Group) Co., Ltd.

CP01 Change in the name or title of a patent holder
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130612

Termination date: 20200813

CF01 Termination of patent right due to non-payment of annual fee