CN113776950A - Water bag structure for pressure test of special-shaped casing and mounting method thereof - Google Patents
Water bag structure for pressure test of special-shaped casing and mounting method thereof Download PDFInfo
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- CN113776950A CN113776950A CN202110938810.1A CN202110938810A CN113776950A CN 113776950 A CN113776950 A CN 113776950A CN 202110938810 A CN202110938810 A CN 202110938810A CN 113776950 A CN113776950 A CN 113776950A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 238000012360 testing method Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000002347 injection Methods 0.000 claims abstract description 14
- 239000007924 injection Substances 0.000 claims abstract description 14
- 239000000314 lubricant Substances 0.000 claims abstract description 4
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 7
- 230000005284 excitation Effects 0.000 abstract description 5
- 206010066054 Dysmorphism Diseases 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/14—Testing gas-turbine engines or jet-propulsion engines
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- Health & Medical Sciences (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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- Combustion & Propulsion (AREA)
- Engineering & Computer Science (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention provides a water bag structure for a pressure test of a special-shaped casing and an installation method thereof. The method comprises the following steps: and (3) smearing a lubricant on the water bag, putting the water bag into the special-shaped casing from an inlet of the special-shaped casing, putting the rear baffle at an outlet of the special-shaped casing, putting the front baffle at the inlet of the special-shaped casing, fixing the front baffle by using a pull rod, injecting water from the water injection port, and connecting the water bag with a test system after the water overflows from the exhaust port. The special-shaped casing hydraulic test device can quickly and effectively complete the special-shaped casing hydraulic test, and improves the test efficiency of the special-shaped casing hydraulic test; the problems of medium leakage caused by test medium leakage and casing failure, pneumatic excitation and the like are avoided, and the safety is improved.
Description
Technical Field
The invention relates to the technical field of pressure tests of special-shaped casings of aircraft engines, in particular to a water bag structure for the pressure tests of the special-shaped casings and an installation method of the water bag structure.
Background
In order to improve the stealth effect of the engine, the exhaust structure of the engine is set to be a special-shaped casing structure with a circular-to-super-elliptical shape, so that the stealth requirement is met. The special-shaped casing has poorer pressure bearing capacity than the common axisymmetric casing, and in order to verify whether the structural design of the special-shaped casing meets the strength use requirement, a pressure test of the special-shaped casing is required to determine the rationality of the design. The special-shaped casing is different from a typical casing, and the structure of the special-shaped casing determines that pneumatic excitation is easy to generate in an air pressure mode, so that a test piece is cracked, and the risk is high.
Chinese patent CN108827606A discloses a static pressure test device for a cartridge, which comprises an outer adapter mounted on the end face of the outer cartridge of the cartridge, and an inner adapter mounted on the end face of the inner cartridge of the cartridge, wherein a floating seal structure is mounted on the inner adapter, the outer ring wall of the floating seal structure is hermetically connected with the outer adapter, and can float between the inner adapter and the outer adapter when the outer adapter or the inner adapter is loaded, so as to avoid deformation interference and load interference of the inner adapter and the outer adapter. The casing of the device is a circular casing with a typical structure, and is not suitable for a special-shaped casing.
Disclosure of Invention
In order to solve the technical problem, the invention provides a water bag structure for a pressure test of a special-shaped casing and an installation method thereof.
The invention is realized by the following technical scheme.
The invention provides a water bag structure for a pressure test of a special-shaped casing, which comprises the special-shaped casing, a water bag, a front baffle and a rear baffle, wherein the water bag is positioned in the special-shaped casing, one end of the water bag is provided with a water injection port and an exhaust port, the front baffle and the rear baffle are respectively positioned at two ends of the special-shaped casing, the rear baffle is provided with holes for the water injection port and the exhaust port to extend out, the front baffle and the rear baffle are connected through a plurality of pull rods, and the pull rods are distributed around the special-shaped casing.
The front baffle and the rear baffle are provided with holes corresponding to the pull rods, and the holes and the pull rods form clearance fit or transition fit.
Nuts are arranged at two ends of the pull rod and are positioned on the outer sides of the front baffle and the rear baffle.
Gaps of 1.5-3 mm are reserved among the front baffle, the rear baffle and the special-shaped casing.
Gaps of 1mm are reserved among the front baffle, the rear baffle and the special-shaped casing respectively.
The pull rods are four and are uniformly distributed.
The water bladder is able to withstand the maximum test pressure differential without failure.
The water bag is a rubber bag with the thickness of 3 mm.
The invention also provides an installation method of the water bag structure for the special-shaped casing pressure test, which comprises the following steps:
step one, a water bag is placed into a special-shaped casing from an inlet of the special-shaped casing, a rear baffle is placed at an outlet of the special-shaped casing, the outlet of the special-shaped casing is shielded, and a water injection port and an exhaust port of the water bag extend out of the rear baffle;
placing the front baffle at the inlet of the special-shaped casing, shielding the inlet of the special-shaped casing, penetrating a pull rod into the front baffle and penetrating out of the rear baffle, screwing nuts at two ends of the pull rod for limiting, and adjusting the nuts to enable gaps to be reserved between the front baffle and the rear baffle and the special-shaped casing respectively;
and step three, opening the exhaust port, injecting water from the water injection port, discharging gas from the exhaust port until water overflows from the exhaust port, closing the exhaust port, and connecting the test system.
In the first step, a lubricant is coated between the water bag and the special-shaped casing.
In the second step, a gap of 1mm is reserved between the front baffle and the rear baffle and the special-shaped casing respectively, when the nut is adjusted, the actual gap difference is measured firstly, and the rotation amplitude is determined through the screw pitch of the nut, so that the gap difference is compensated.
And in the third step, when the test system is connected, the front baffle is fixed on the existing structure.
The invention has the beneficial effects that:
the water bag has the advantages of simple structure, convenient processing and low cost, and is suitable for popularization and use; the special-shaped water bag structure is adopted, the hydraulic test of the special-shaped casing is quickly and effectively completed, and the test efficiency of the pressure test of the special-shaped casing is improved; in the test process, the problems of medium leakage and the like caused by test medium leakage and casing failure are avoided, the generation of cracks on a test piece due to pneumatic excitation is avoided, and the safety is improved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of the water bladder.
Fig. 3 is a cross-sectional view of the present invention.
Fig. 4 is a detailed view of portion a of fig. 3.
In the figure: 1-a special-shaped case; 2-water bag; 3-front baffle; 4-a rear baffle; 5-water injection port; 6-an exhaust port; 7-a pull rod; 8-nut.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
As shown in FIGS. 1 to 3, the structure of the present invention is schematically illustrated:
the invention provides a water bag structure for a pressure test of a special-shaped casing, which comprises a special-shaped casing 1, a water bag 2, a front baffle 3 and a rear baffle 4, wherein the water bag 2 is positioned in the special-shaped casing 1, one end of the water bag 2 is provided with a water injection port 5 and an exhaust port 6, the front baffle 3 and the rear baffle 4 are respectively positioned at two ends of the special-shaped casing 1, the rear baffle 4 is provided with holes for the water injection port 5 and the exhaust port 6 to extend out, the front baffle 3 and the rear baffle 4 are connected through a plurality of pull rods 7, and the pull rods 7 are distributed around the special-shaped casing 1.
During pressure test, the water bag 2 is placed into the special-shaped casing 1 from the inlet of the special-shaped casing 1, the water injection port 5 and the exhaust port 6 extend out of the rear baffle 4, the front baffle 3 is placed at the inlet of the special-shaped casing 1 and shields the inlet of the special-shaped casing 1, and the front baffle 3 and the rear baffle 4 are fixed through the pull rod 7. After the installation is completed, the exhaust port 6 is opened, water is injected from the water injection port 5, gas is discharged from the exhaust port 6 until water overflows from the exhaust port 6, and then a test system is connected, so that a pressure test can be carried out.
The water bag 2 has simple structure, convenient processing and low cost, and is suitable for popularization and use; the special-shaped water bag 2 structure is adopted, the hydraulic test of the special-shaped casing 1 is quickly and effectively completed, and the test efficiency of the pressure test of the special-shaped casing 1 is improved; in the test process, the problems of medium leakage and the like caused by test medium leakage and casing failure are avoided, the generation of cracks on a test piece due to pneumatic excitation is avoided, and the safety is improved.
The front baffle 3 and the rear baffle 4 are provided with holes corresponding to the pull rod 7, and the holes and the pull rod 7 form clearance fit or transition fit. The angle of the front baffle 3 and the angle of the rear baffle 4 are convenient to keep stable, the skew is avoided, and the installation is convenient.
And nuts 8 are arranged at two ends of the pull rod 7, and the nuts 8 are positioned on the outer sides of the front baffle 3 and the rear baffle 4. The distance between the front baffle 3 and the rear baffle 4 and the special-shaped casing 1 is adjusted through the nut 8, so that accurate adjustment is facilitated.
Gaps of 1.5-3 mm are reserved between the front baffle 3 and the special-shaped casing 1 and between the rear baffle 4 and the special-shaped casing.
Gaps of 1mm are reserved between the front baffle 3 and the special-shaped casing 1 and between the rear baffle 4 and the special-shaped casing 1 respectively.
The clearance is as shown in figure 4, during pressure test, the water bag 2 all has the atress contact with preceding baffle 3, backplate 4, dysmorphism machine casket 1, through this setting, prevents that in the experimentation, because reasons such as the production micro-displacement between dysmorphism machine casket 1 warp, preceding baffle 3, backplate 4, the dysmorphism machine casket 1 lead to special-shaped machine casket 1 and baffle rigid contact, is convenient for protect the machine casket, prevents that the machine casket from receiving damage, deformation in the experiment.
The pull rods 7 are four and are uniformly distributed.
The water bladder 2 is able to withstand the maximum test pressure differential without failure.
The water bag 2 is a rubber bag with the thickness of 3 mm.
The invention also provides an installation method of the water bag structure for the special-shaped casing pressure test, which comprises the following steps:
step one, a water bag 2 is placed into a special-shaped case 1 from an inlet of the special-shaped case 1, a rear baffle 4 is placed at an outlet of the special-shaped case 1, the outlet of the special-shaped case 1 is shielded, and a water injection port 5 and an exhaust port 6 of the water bag 2 extend out of the rear baffle 4;
placing the front baffle 3 at the inlet of the special-shaped casing 1, shielding the inlet of the special-shaped casing 1, penetrating the pull rod 7 from the front baffle 3 and out of the rear baffle 4, screwing the two ends of the pull rod 7 into the nuts 8 for limiting, and adjusting the nuts 8 to enable gaps to be reserved between the front baffle 3 and the rear baffle 4 and the special-shaped casing 1 respectively;
and step three, opening the exhaust port 6, injecting water from the water injection port 5, discharging the gas from the exhaust port 6 until water overflows from the exhaust port 6, closing the exhaust port 6, and connecting the test system.
By the method, the hydraulic test of the special-shaped casing 1 is quickly and effectively completed, and the test efficiency of the pressure test of the special-shaped casing 1 is improved; the problems of medium leakage and the like caused by test medium leakage and casing failure are avoided, the test piece is prevented from generating cracks due to pneumatic excitation, and the safety is improved. Meanwhile, the rigid contact between the front baffle 3 and the rear baffle 4 and the special-shaped case 1 is avoided, and the case is prevented from being damaged and deformed in an experiment.
In the first step, a lubricant is coated between the water bag 2 and the special-shaped casing 1. Prevent deformation and displacement from generating friction, and improve safety.
In the second step, a gap of 1mm is reserved between the front baffle 3 and the special-shaped casing 1 and between the rear baffle 4 and the special-shaped casing 1 respectively, when the nut 8 is adjusted, an actual gap difference value is measured, and the rotation amplitude is determined through the screw pitch of the nut 8, so that the gap difference value is compensated. The adjustment is accurate.
In the third step, when the test system is connected, the front baffle 3 is fixed on the existing structure. The stability of the experimental process is ensured, and when the interface is separated from the other conditions, the impact force is prevented from causing the special-shaped casing 1 to move, and the safety is improved.
Claims (10)
1. The utility model provides a water pocket structure for special-shaped machine casket pressure test which characterized in that: including special-shaped machine casket (1), water pocket (2), preceding baffle (3), backplate (4), water pocket (2) are located special-shaped machine casket (1), and water pocket (2) one end is equipped with water filling port (5), gas vent (6), preceding baffle (3), backplate (4) are located the both ends of special-shaped machine casket (1) respectively, set up the hole that supplies water filling port (5), gas vent (6) to stretch out on backplate (4), connect through many pull rods (7) between preceding baffle (3), the backplate (4), and pull rod (7) distribute around special-shaped machine casket (1).
2. The water bag structure for the pressure test of the special-shaped casing according to claim 1, wherein: the front baffle (3) and the rear baffle (4) are provided with holes corresponding to the pull rod (7), and the holes and the pull rod (7) form clearance fit or transition fit.
3. The water bag structure for the pressure test of the special-shaped casing according to claim 2, wherein: and nuts (8) are arranged at two ends of the pull rod (7), and the nuts (8) are positioned on the outer sides of the front baffle (3) and the rear baffle (4).
4. The water bag structure for the pressure test of the special-shaped casing according to claim 3, wherein: gaps of 1.5-3 mm are reserved between the front baffle (3), the rear baffle (4) and the special-shaped casing (1).
5. The water bag structure for the pressure test of the special-shaped casing according to claim 4, wherein: gaps of 1mm are reserved between the front baffle (3), the rear baffle (4) and the special-shaped casing (1).
6. The water bag structure for the pressure test of the special-shaped casing according to claim 1, wherein: the water bladder (2) is capable of withstanding a maximum test pressure differential without failure.
7. The method for mounting the water bag structure for the pressure test of the special-shaped casing according to any one of claims 1 to 6, wherein: comprises the following steps of (a) carrying out,
step one, a water bag (2) is placed into a special-shaped case (1) from an inlet of the special-shaped case (1), a rear baffle (4) is placed at an outlet of the special-shaped case (1), the outlet of the special-shaped case (1) is shielded, and a water injection port (5) and an exhaust port (6) of the water bag (2) extend out of the rear baffle (4);
placing the front baffle (3) at the inlet of the special-shaped casing (1), shielding the inlet of the special-shaped casing (1), penetrating the pull rod (7) from the front baffle (3) and out of the rear baffle (4), screwing the two ends of the pull rod (7) into the nuts (8) for limiting, and adjusting the nuts (8) to enable gaps to be reserved between the front baffle (3) and the rear baffle (4) and the special-shaped casing (1) respectively;
and step three, opening the exhaust port (6), injecting water from the water injection port (5), discharging the gas flushing exhaust port (6) until water overflows from the exhaust port (6), closing the exhaust port (6), and connecting the test system.
8. The method for mounting a water sac structure for a profiled casing pressure test according to claim 7, wherein: in the first step, a lubricant is coated between the water bag (2) and the special-shaped casing (1).
9. The method for mounting a water sac structure for a profiled casing pressure test according to claim 7, wherein: in the second step, a gap of 1mm is reserved between the front baffle (3) and the special-shaped casing (1) and between the rear baffle (4) and the special-shaped casing (1), when the nut (8) is adjusted, an actual gap difference value is measured, and the rotation amplitude is determined through the screw pitch of the nut (8), so that the gap difference value is compensated.
10. The method for mounting a water sac structure for a profiled casing pressure test according to claim 7, wherein: and in the third step, when the test system is connected, the front baffle (3) is fixed on the existing structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110938810.1A CN113776950A (en) | 2021-08-16 | 2021-08-16 | Water bag structure for pressure test of special-shaped casing and mounting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110938810.1A CN113776950A (en) | 2021-08-16 | 2021-08-16 | Water bag structure for pressure test of special-shaped casing and mounting method thereof |
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| CN113776950A true CN113776950A (en) | 2021-12-10 |
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| CN202110938810.1A Pending CN113776950A (en) | 2021-08-16 | 2021-08-16 | Water bag structure for pressure test of special-shaped casing and mounting method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526919A (en) * | 2022-02-21 | 2022-05-24 | 中国航发贵阳发动机设计研究所 | Test method and tool for verifying strength of special-shaped jet pipe of aircraft engine |
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