CN110926921A - Pressure test system of combustion chamber outer casing - Google Patents
Pressure test system of combustion chamber outer casing Download PDFInfo
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- CN110926921A CN110926921A CN201911156756.4A CN201911156756A CN110926921A CN 110926921 A CN110926921 A CN 110926921A CN 201911156756 A CN201911156756 A CN 201911156756A CN 110926921 A CN110926921 A CN 110926921A
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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
- G01N3/02—Details
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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
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Abstract
The invention discloses a pressure test system of a combustion chamber outer casing, which comprises a test piece (4), wherein the test piece is the combustion chamber outer casing; a fixed base (1) is vertically inserted into the test piece; the upper end and the lower end of the fixed base are hermetically connected with the upper end and the lower end of the test piece; the bottom of the fixed base is provided with an oil inlet adapter (2) which is transversely distributed; one end of the oil inlet adapter is communicated with an oil outlet of an oil pump (5) through an oil outlet pipeline (18); the other end of the oil inlet adapter is communicated with the lower part of the inner cavity of the test piece through an oil through hole (17) at the bottom of the fixed base; the upper part of the inner cavity of the test piece is communicated with an oil inlet of the oil pump (5) through an oil return port adapter (8) and an oil return pipeline (19); the inner wall surface of the test piece is provided with a strain gauge (16). The invention can load the pressure load on the combustion chamber outer casing, measure the strain data in time and can be used for checking the structural strength of the combustion chamber outer casing.
Description
Technical Field
The invention relates to the technical field of testing of aero-engine combustion chamber casings, in particular to a pressure testing system of a combustion chamber casing.
Background
At present, an outer combustion chamber casing of an aero-engine is an important component of the aero-engine, and mainly bears a circumferential force formed by internal and external pressure difference, and the circumferential force accounts for the most part of the stress of the outer casing. Therefore, the bearing capacity of the combustion chamber outer casing structure is an important index for design and examination.
In order to check the reasonability of the structural strength design of the combustion chamber outer casing, a reasonable test system and a reasonable test method need to be designed, so that the loading of the axial force of the outer casing is realized, the stress of the key part of the outer casing is measured at the same time, the stress is compared with a finite element analysis structure, and the accuracy of a finite element model is verified. In addition, the structure of the test piece is improved and optimized according to the distribution data of the measured stress.
In order to realize the examination of the pressure load of the outer casing, a pressure test system of the outer casing of the combustion chamber needs to be designed to meet the test requirement.
However, there is no technology for loading a pressure load on the combustion chamber outer casing and measuring strain data of the combustion chamber outer casing in time so as to examine the structural strength of the combustion chamber outer casing.
Disclosure of Invention
The invention aims to provide a pressure test system of a combustion chamber outer casing aiming at the technical defects in the prior art.
Therefore, the invention provides a pressure test system of a combustion chamber outer casing, which comprises a hollow test piece with openings at the upper end and the lower end, wherein the test piece is the combustion chamber outer casing;
a fixed base is vertically inserted into the test piece;
the upper end and the lower end of the fixed base are hermetically connected with the upper end and the lower end of the test piece;
the bottom of the fixed base is provided with an oil inlet adapter which is transversely distributed;
one end of the oil inlet adapter is communicated with an oil outlet of an oil pump through an oil outlet pipeline;
the other end of the oil inlet adapter is communicated with the lower part of the inner cavity of the test piece through vertically distributed oil through holes formed in the bottom of the fixed base;
the upper part of the inner cavity of the test piece is communicated with an oil inlet of the oil pump through an oil return port adapter and an oil return pipeline;
and a strain gauge is arranged on the surface of the inner wall of the test piece and used for acquiring a strain value of a casing outside the combustion chamber.
Wherein, the lower end of the test piece is provided with a lower flange;
the periphery of the lower end of the fixed base is provided with a boss protruding outwards;
the lower flange of the lower end of the test piece is fixedly connected with the top surface of the boss at the lower end of the fixed base through bolts.
A first sealing washer is sleeved outside the bolt between the bottom surface of the lower flange of the test piece and the top surface of the boss at the lower end of the fixed base.
Wherein, the upper end of the test piece is provided with an upper flange;
the outer side of the upper part of the fixed base is provided with a switching ring;
the upper flange arranged at the upper end of the test piece is fixedly connected with the edge parts protruding from the four sides of the lower end of the switching ring through bolts.
And a second sealing washer is sleeved outside the bolt between the top surface of the upper flange of the test piece and the bottom surface of the edge part protruding from the four sides of the lower end of the connecting ring.
Wherein, the upper part of the switching ring is covered with an end cover which is distributed annularly;
the oil return port adapter is arranged in a vertical through hole reserved in the end cover;
the lower end of the oil return port adapter is communicated with the upper part of the inner cavity of the test piece;
the upper end of the oil return port adapter is hermetically connected with one end of the oil return pipeline;
the other end of the oil return pipeline is communicated with an oil inlet of the oil pump.
Wherein, the central round hole of the end cover is sleeved with the outer wall of the upper part of the fixed base;
two O-shaped sealing rings which are distributed at intervals are arranged between a central circular hole of the end cover and the outer wall of the upper part of the fixed base.
The bottom surface of the end cover is provided with a peripheral edge part which covers the upper part of the switching ring and is contacted with the peripheral outer surface of the upper part of the switching ring;
an O-shaped sealing ring is arranged between the peripheral edge part on the bottom surface of the end cover and the peripheral outer surface of the upper part of the switching ring.
Wherein, a sealing signal adapter is also arranged on a vertical through hole reserved on the end cover;
one end of the sealed signal adapter is communicated with the strain gauge through a signal wire;
the other end of the sealing signal adapter is connected with the data acquisition instrument through a signal wire.
Wherein, the upper part of the fixed base is provided with an external thread;
the external thread on the uppermost part of the fixed base is in threaded connection with a nut;
the bottom surface of the nut is in pressing contact with the top surface of the end cover;
the left end and the right end of the nut are respectively in threaded connection with a stress application rod;
the two stress application rods are positioned on the same axis;
the top surface center position of fixed base, a fixed connection rings.
Compared with the prior art, the pressure test system of the combustion chamber outer casing can load the pressure load on the combustion chamber outer casing, measure the strain data of the combustion chamber outer casing in time, and specifically can realize the internal hydraulic loading of the combustion chamber outer casing and the strain measurement of the combustion chamber outer casing inner wall, so that the pressure test system can be used for checking the structural strength of the combustion chamber outer casing and providing data support for structural optimization.
Drawings
FIG. 1 is an overall assembly view of a pressure testing system for a combustion chamber outer casing according to the present invention during testing of the combustion chamber outer casing;
FIG. 2 is a semi-sectional view of a pressure testing system for a combustor case according to the present invention, in an exemplary embodiment;
in the figure, 1 is a fixed base, 2 is an oil inlet adapter, 31 is a first sealing washer, 32 is a second sealing washer, 4 is a test piece (namely, an outer casing of a combustion chamber), and 5 is an oil pump;
6 is a pressure control system, 7 is a transfer ring, 8 is an oil return port adapter, 9 is an end cover, and 10 is a stress application rod;
11 is a nut, 12 is a lifting ring, 13 is a data acquisition instrument, 14 is a sealing signal adapter, and 15 is an O-shaped sealing ring; and 16 is a strain gauge.
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and embodiments.
Referring to fig. 1 and 2, the pressure testing system for the combustion chamber outer casing provided by the invention comprises a hollow test piece 4 with openings at the upper end and the lower end, wherein the test piece 4 is the combustion chamber outer casing;
a fixed base 1 is vertically inserted into the test piece 4;
the upper end and the lower end of the fixed base 1 are hermetically connected with the upper end and the lower end of the test piece 4;
the bottom of the fixed base 1 is provided with an oil inlet adapter 2 which is transversely distributed;
one end of the oil inlet adapter 2 is communicated with an oil outlet of an oil pump 5 through an oil outlet pipeline 18;
the other end of the oil inlet adapter 2 is communicated with the lower part of the inner cavity of the test piece 4 through oil through holes 17 which are vertically distributed and arranged at the bottom of the fixed base 1;
the upper part of the inner cavity of the test piece 4 is communicated with an oil inlet of the oil pump 5 through an oil return port adapter 8 and an oil return pipeline 19;
the inner wall surface of the test piece 4 is provided with a strain gauge 16, and the strain gauge 16 is used for acquiring the strain value of a combustion chamber outer casing.
In the invention, in a concrete implementation, the lower end of the test piece 4 is provided with a lower flange;
the periphery of the lower end of the fixed base 1 is provided with a lug boss protruding outwards;
the lower flange of the lower end of the test piece 4 is fixedly connected with the top surface of the boss at the lower end of the fixed base 1 through bolts.
In the concrete implementation, a first sealing washer 31 is sleeved outside the bolt between the bottom surface of the lower flange of the test piece 4 and the top surface of the boss at the lower end of the fixed base 1. Thus, the lower flange surface of the test piece 4 was sealed.
It should be noted that, in the present invention, one end of the oil inlet adapter 2 is fixed on the fixed base 1 through a thread, and the other end is connected with the oil outlet pipeline 18 of the oil pump 5, and hydraulic oil enters the inside of the test piece 4 through the oil inlet adapter 2 and the oil through hole 17 at the bottom of the fixed base 1, so as to realize the injection function of hydraulic oil.
It should be noted that, for the present invention, the oil outlet of one end of the oil pump 5 is connected to the oil inlet adapter 2 through an oil outlet pipeline, and the oil inlet of the other end is connected to the oil return port adapter 8 through an oil return pipeline, so as to form a hydraulic loading closed loop.
It should be noted that, for the present invention, one end of the oil return port adapter 8 is fixed on the end cover 9 through a thread, and the other end is connected with the oil return pipeline of the oil pump 5, when the test piece 4 is filled with the hydraulic oil, the redundant hydraulic oil flows back to the oil pump through the oil return port adapter 8 and the oil return pipeline;
in the invention, in a concrete implementation, the upper end of the test piece 4 is provided with an upper flange;
the outer side of the upper part of the fixed base 1 is provided with a switching ring 7;
the upper flange arranged at the upper end of the test piece 4 is fixedly connected with the edge parts protruding from the four sides of the lower end of the switching ring 7 through bolts.
In concrete implementation, a second sealing washer 32 is sleeved outside the bolt between the top surface of the upper flange of the test piece 4 and the bottom surface of the edge part protruding from the four sides of the lower end of the connecting ring 7. Therefore, the upper flange surface of the test piece 4 is sealed, and the sealing function is performed.
In particular, the upper part of the switching ring 7 is covered with an end cover 9 which is distributed annularly;
the oil return port adapter 8 is arranged in a vertical through hole reserved on the end cover 9;
the lower end of the oil return port adapter 8 is communicated with the upper part of the inner cavity of the test piece 4;
the upper end of the oil return port adapter 8 is hermetically connected with one end of an oil return pipeline 19;
the other end of the oil return pipeline 19 is communicated with an oil inlet of the oil pump 5.
In particular, a central circular hole formed in the end cover 9 is sleeved with the outer wall of the upper part of the fixed base 1;
two O-shaped sealing rings 15 which are distributed at intervals are arranged between a central circular hole of the end cover 9 and the outer wall of the upper part of the fixed base 1. Thus, the upper portion of the end cap 9 forms a good sealing structure.
In particular, the bottom surface of the end cover 9 is provided with a peripheral edge part which is covered on the upper part of the switching ring 7 and is contacted with the peripheral outer surface of the upper part of the switching ring 7;
an O-ring 15 is provided between the peripheral edge of the bottom surface of the end cap 9 and the outer peripheral surface of the upper portion of the adapter ring 7, so that a good sealing structure is formed at the lower portion of the end cap 9.
It should be noted that, for the present invention, the number of the O-ring seals 15 is 3 in total, and the O-ring seals are assembled with the fixed base 1 and the end cover 9 to perform a sealing function and prevent hydraulic oil from leaking.
In particular, a sealing signal adapter 14 is also arranged on a vertical through hole reserved on the end cover 9;
one end of the sealed signal adapter 14 is communicated with the strain gauge 16 through a signal wire;
the other end of the sealing signal adapter 14 is connected with the data acquisition instrument 13 through a signal line.
The oil return port adapter 8 and the sealing signal adapter 14 are fixed to the upper portion of the end cover 9, and are sealed.
It should be noted that the data collector 13 is connected to the sealing signal adapter 14, and is configured to collect strain data of the test piece 4 under a pressure load, that is, a strain value of the combustion chamber outer casing measured by the strain gauge 16 through the sealing signal adapter 14.
In the present invention, the strain gauge 16 is a unidirectional strain gauge, and is connected to the sealed signal adapter 14 by a cable. The 502 glue is pasted on the inner wall surface of the test piece 4, and meanwhile, after the strain gauge 16 is pasted on the inner wall surface of the test piece 4, the outer surface of the strain gauge is also coated with double layers of different glue, specifically: and a double-layer protection measure combining 703 glue and 5699 glue is adopted, so that the strain gauge is prevented from being damaged due to soaking of hydraulic oil.
In the concrete implementation, the sealing signal adapter 14 is fixed on the end cover 9 through a bolt, and is sealed through a rubber sealing gasket to prevent hydraulic oil from leaking. The sealing signal adapter 14 is connected with the strain gauge 16, and is used for transmitting a strain signal (i.e. strain data of the combustion chamber outer casing) measured by the strain gauge 16 to the data acquisition instrument 13.
In the concrete implementation, the upper part of the fixed base 1 is provided with an external thread;
the uppermost external thread (i.e., the pillar thread) of the fixed base 1 is threadedly coupled with a nut 11;
the bottom surface of the nut 11 is in pressing contact with the top surface (i.e., shoulder structure) of the end cap 9.
It should be noted that the nut 11 is screwed on the upright post thread on the upper part of the fixed base 1, and is used for pressing the end cover 9 against the shoulder structure of the fixed base 1, for bearing the axial hydraulic load in the test, and at the same time, pressing the O-ring 15 to deform, so as to play a sealing role.
In the concrete implementation, the left end and the right end of the nut 11 are respectively in threaded connection with a stress application rod 10;
the two force applying rods 10 are located on the same axis.
However, the reinforcing bar 10 is used to tighten the nut 11.
In the concrete implementation, a lifting ring 12 is fixedly connected (for example, in a threaded connection) at the center of the top surface of the fixed base 1 and is used for lifting the test system.
In the present invention, the oil pump 5 is further connected to a pressure control system 6.
And the pressure control system 6 is used for accurately controlling the output pressure of the oil pump 5 to reach the test pressure load specified in the test.
It should be noted that the pressure control system 6 includes a programmable dc power supply and a PLC programming control software. The PLC programming control software is connected with the programmable direct current power supply through a data transmission line, and the programmable direct current power supply is connected with the oil pump 5 through a signal transmission line. In the concrete implementation, a control program is written in PLC programming software to control a programmable direct current power supply to output a control signal, the control signal is output to a servo valve of the oil pump 5 to control the flow and the output pressure of the servo valve, a pressure sensor of the oil pump 5 feeds the measured pressure and the measured flow back to the PLC, and the PLC continuously corrects the output signal according to the difference value between a target pressure value and an actual pressure value until the specified test flow and pressure value are reached to form closed-loop control.
In a specific implementation, the pressure control system 6 specifically comprises a programmable controller, such as a model ZY6952 programmable controller manufactured by eagle Sharp electronics ltd in Nanjing, with parameters of 30V/20A/600W.
It should be noted that the pressure test system of the combustion chamber outer casing is designed for meeting the requirements of pressure load loading and strain data measurement of a test piece, and has the advantages of simple structure, convenience in operation, accurate pressure control and accurate and reliable strain measurement.
In the present invention, the fixing base 1 and the adapting ring 7 together constitute a connecting tool for fixing the test piece 4. The adapter ring 7 is connected with an upper flange of the test piece 4 through a bolt; the lower part of the fixed base 1 and the lower flange of the test piece 4 are connected by bolts.
It should be noted that, in the present invention, the sealing system includes a sealing element and a sealing tool, and is used for sealing the pressure inside the test piece.
Wherein the sealing elements comprise a first sealing washer 31, a second sealing washer 32 and three O-rings 15. The first sealing washer 31 and the second sealing washer 32 are made of polytetrafluoroethylene which has high corrosion resistance, stable physical properties and high and low temperature resistance, and are used for sealing between a test piece flange and a connecting tool (comprising a fixed base 1 and a switching ring 7), and the size of each sealing washer is processed according to the size of the test piece flange; the O-shaped sealing ring 15 is made of nitrile rubber, and has the advantages of good oil resistance, high wear resistance and good heat resistance.
The sealing tool comprises a switching ring 7, an end cover 9, a stress application rod 10 and a nut 11, and the sealing tool plays a role in sealing after being assembled with an O-shaped sealing ring 15.
It should be noted that, in the present invention, there is a hydraulic loading system for loading the pressure inside the test piece. In the concrete realization, hydraulic loading system includes oil inlet adapter 2, oil pump 5, pressure control system 6, oil return port adapter 8, constitutes pressure loading's control circuit together, can realize the accurate closed-loop control loading of pressure value.
It should be noted that, in the present invention, a strain measurement system is provided for measuring the strain of the test piece under a pressure state. In a specific implementation, the strain measurement system comprises a data acquisition instrument 13, a sealing signal adapter 14 and a strain gauge 16. In the test, the strain data of the measuring point can be collected by the data collector 13, and then the stress at the measuring point of the test piece can be calculated by using the measured strain data.
The stress is calculated as follows:
σ＝E×ε；
wherein, sigma is stress, and the unit is MPa; e is the elastic modulus of the test piece material, and the value is 205 GPa; ε is the strain value measured by the strain gage 16.
In particular, according to the invention, as the strain gauge 16 is positioned in the test piece and the periphery of the test piece is filled with hydraulic oil, special protection processing needs to be carried out on the strain gauge 16, so that damage to the strain gauge or inaccuracy of data can be prevented. The double-layer protection measure of the combination of 703 glue and 5699 glue is adopted, after the outer surface of the strain gauge 16 is coated, the strain gauge needs to stand for 24 hours, and then hydraulic oil can be injected into the test piece.
In order to more clearly understand the present invention, the following description is provided for the specific installation and debugging steps of the pressure testing system of the combustion chamber casing provided by the present invention:
first, sandpaper was used. Grinding the position of the inner surface of the test piece 4 to which the strain gauge 16 needs to be adhered, adhering the strain gauge 16 to the inner surface of the test piece 4 by using 502 glue, connecting the strain gauge 16 with the sealing signal adapter 14 by using a signal wire, respectively coating 5699 glue and 703 glue on the outer surface of the strain gauge 16, and drying for 24 hours;
then, the lower flange of the test piece 4 and the first seal washer 31 are screwed to the boss on the lower part of the fixed base 1, and the upper flange of the test piece 4 and the second seal washer 32 are screwed to the adaptor ring 7.
Then, the sealing signal adapter 14 and the oil return port adapter 8 are connected with the end cover 9;
then, assembling the end cover 9 and the O-shaped sealing ring 15 with the fixed base 1 and the switching ring 7;
then, the reinforcing rod 10 is screwed on the nut 11, then the nut 11 is screwed on the fixed base 1, and the nut 11 is screwed by the reinforcing rod 10 so as to press the end cover 9;
then, the hanging ring 12 is fixed on the fixed base 1;
then, the data acquisition instrument 13 is connected with the sealing signal adapter 14 through a signal cable, the data acquisition instrument 13 is started, and signals of the strain gauge 16 are acquired and observed to ensure that the signals are normal;
then, screwing an oil inlet adapter 2 on the fixed base 1, connecting an oil inlet pipeline of the oil pump 5 with the oil inlet adapter 2, connecting an oil return pipeline with an oil return port connector 8, and connecting the pressure control system 6 with the oil pump 5;
then, an oil outlet pipeline and an oil return pipeline of the oil pump 5 are both opened, the pressure control system 6 is utilized to control the oil pump 5 to inject hydraulic oil into the test piece 4, when the test piece 4 is filled with the hydraulic oil, the oil return pipeline is closed, and the pressure in the test piece 4 is increased by adjusting the pressure control system 6;
then, starting the data acquisition instrument 13, setting test acquisition parameters, balancing and resetting each channel, and then starting data acquisition;
then, the test pressure was increased by 10% step length with 50% of the specified test pressure as the starting pressure, the pressure was stabilized for 1min at each load step, and when the test pressure reached 100%, the pressure was maintained for 1min, and then the pressure was unloaded by adjusting the pressure control system 6.
And finally, stopping data acquisition of the data acquisition instrument 13, sorting and storing the data, and finishing the test.
In conclusion, the pressure test system for the combustion chamber outer casing provided by the invention has the advantages of simple structure, convenience in operation, accurate pressure control, accurate and reliable strain measurement and excellent sealing performance.
Compared with the prior art, the pressure test system of the combustion chamber outer casing provided by the invention has the following advantages:
1. the invention adopts polytetrafluoroethylene and nitrile rubber with excellent oil resistance, corrosion resistance and stable physical properties as sealing materials, so that the sealing performance of a test system is more stable.
2. The invention adopts a sealing assembly form of non-rigid connection of the switching ring 7 and the end cover 9, releases the axial constraint freedom degree of a test piece, enables the test piece to be only under the action of circumferential pressure load, and accords with the actual load-bearing working condition of the test piece.
3. The invention adopts a hydraulic closed-loop loading system, realizes the accurate control of the hydraulic loading force, and leads the measurement result of the strain under each pressure load to be more stable and effective.
4. In the invention, the adopted sealed signal adapter 14 is a glass sintered sealed aviation connector, and has the advantages of high pressure resistance, sealing performance and reliable signal transmission, so that the transmission of strain signals is more stable.
In summary, compared with the prior art, the pressure test system of the combustion chamber outer casing provided by the invention can load the pressure load on the combustion chamber outer casing, measure the strain data of the combustion chamber outer casing in time, and specifically can realize the internal hydraulic loading of the combustion chamber outer casing and the strain measurement of the combustion chamber outer casing inner wall, so that the pressure test system can be used for checking the structural strength of the combustion chamber outer casing and providing data support for structural optimization.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The pressure test system of the combustion chamber outer casing is characterized by comprising a hollow test piece (4) with openings at the upper end and the lower end, wherein the test piece (4) is the combustion chamber outer casing;
a fixed base (1) is vertically inserted into the test piece (4);
the upper end and the lower end of the fixed base (1) are hermetically connected with the upper end and the lower end of the test piece (4);
the bottom of the fixed base (1) is provided with an oil inlet adapter (2) which is transversely distributed;
one end of the oil inlet adapter (2) is communicated with an oil outlet of an oil pump (5) through an oil outlet pipeline (18);
the other end of the oil inlet adapter (2) is communicated with the lower part of the inner cavity of the test piece (4) through oil through holes (17) which are vertically distributed and arranged at the bottom of the fixed base (1);
the upper part of the inner cavity of the test piece (4) is communicated with an oil inlet of the oil pump (5) through an oil return port adapter (8) and an oil return pipeline (19);
and a strain gauge (16) is arranged on the surface of the inner wall of the test piece (4), and the strain gauge (16) is used for acquiring a strain value of a combustion chamber outer casing.
2. Pressure test system according to claim 1, characterised in that the lower end of the test piece (4) has a lower flange;
the periphery of the lower end of the fixed base (1) is provided with a lug boss protruding outwards;
the lower flange of the lower end of the test piece (4) is fixedly connected with the top surface of the boss at the lower end of the fixed base (1) through bolts.
3. The pressure test system according to claim 2, wherein a first sealing washer (31) is sleeved on the outer portion of the bolt between the bottom surface of the lower flange of the test piece (4) and the top surface of the boss at the lower end of the fixed base (1).
4. Pressure testing system according to claim 1, characterized in that the upper end of the test piece (4) has an upper flange;
the outer side of the upper part of the fixed base (1) is provided with a switching ring (7);
the upper flange arranged at the upper end of the test piece (4) is fixedly connected with the edge parts protruding from the four sides of the lower end of the switching ring (7) through bolts.
5. The pressure test system according to claim 4, wherein a second sealing washer (32) is fitted over the bolt between the top surface of the upper flange of the test piece (4) and the bottom surface of the edge portion projecting from the four sides of the lower end of the connecting ring (7).
6. Pressure testing system according to claim 4, characterised in that the adapter ring (7) is covered at the top with an annularly arranged end cap (9);
the oil return port adapter (8) is arranged in a vertical through hole reserved on the end cover (9);
the lower end of the oil return port adapter (8) is communicated with the upper part of the inner cavity of the test piece (4);
the upper end of the oil return port adapter (8) is hermetically connected with one end of an oil return pipeline (19);
the other end of the oil return pipeline (19) is communicated with an oil inlet of the oil pump (5).
7. Pressure test system according to claim 6, characterised in that the end cap (9) has a central circular hole which is in socket connection with the upper outer wall of the fixed base (1);
two O-shaped sealing rings (15) which are distributed at intervals are arranged between a central circular hole of the end cover (9) and the outer wall of the upper part of the fixed base (1).
8. The pressure testing system as claimed in claim 6, wherein the bottom surface of the end cap (9) has a peripheral edge portion covering the upper portion of the adaptor ring (7) and contacting the peripheral outer surface of the upper portion of the adaptor ring (7);
an O-shaped sealing ring (15) is arranged between the peripheral edge part of the bottom surface of the end cover (9) and the peripheral outer surface of the upper part of the adapting ring (7).
9. The pressure test system according to claim 6, wherein a sealing signal adapter (14) is further mounted on a vertical through hole reserved in the end cover (9);
one end of the sealed signal adapter (14) is communicated with the strain gauge (16) through a signal wire;
the other end of the sealing signal adapter (14) is connected with the data acquisition instrument (13) through a signal line.
10. Pressure testing system according to claim 6, characterized in that the fixed base (1) has an upper part with an external thread;
the uppermost external thread of the fixed base (1) is in threaded connection with a nut (11);
the bottom surface of the nut (11) is in pressing contact with the top surface of the end cover (9);
the left end and the right end of the nut (11) are respectively in threaded connection with a stress application rod (10);
the two stress application rods (10) are positioned on the same axis;
the center of the top surface of the fixed base (1) is fixedly connected with a hanging ring (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911156756.4A CN110926921A (en) | 2019-11-22 | 2019-11-22 | Pressure test system of combustion chamber outer casing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911156756.4A CN110926921A (en) | 2019-11-22 | 2019-11-22 | Pressure test system of combustion chamber outer casing |
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| CN110926921A true CN110926921A (en) | 2020-03-27 |
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| CN201911156756.4A Pending CN110926921A (en) | 2019-11-22 | 2019-11-22 | Pressure test system of combustion chamber outer casing |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113063666A (en) * | 2021-04-01 | 2021-07-02 | 中国航发常州兰翔机械有限责任公司 | Aeroengine casing pressure test tool and using method thereof |
| CN113776950A (en) * | 2021-08-16 | 2021-12-10 | 中国航发贵阳发动机设计研究所 | Water bag structure for pressure test of special-shaped casing and mounting method thereof |
| CN114235590A (en) * | 2021-12-15 | 2022-03-25 | 中国航发动力股份有限公司 | Multi-cavity casing pressure test device and method |
| CN116008090A (en) * | 2023-02-16 | 2023-04-25 | 北京成立科技有限公司 | Aeroengine combustion chamber casing internal pressure test device |
-
2019
- 2019-11-22 CN CN201911156756.4A patent/CN110926921A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113063666A (en) * | 2021-04-01 | 2021-07-02 | 中国航发常州兰翔机械有限责任公司 | Aeroengine casing pressure test tool and using method thereof |
| CN113063666B (en) * | 2021-04-01 | 2023-02-10 | 中国航发常州兰翔机械有限责任公司 | Aeroengine casing pressure test tool and using method thereof |
| CN113776950A (en) * | 2021-08-16 | 2021-12-10 | 中国航发贵阳发动机设计研究所 | Water bag structure for pressure test of special-shaped casing and mounting method thereof |
| CN114235590A (en) * | 2021-12-15 | 2022-03-25 | 中国航发动力股份有限公司 | Multi-cavity casing pressure test device and method |
| CN116008090A (en) * | 2023-02-16 | 2023-04-25 | 北京成立科技有限公司 | Aeroengine combustion chamber casing internal pressure test device |
| CN116008090B (en) * | 2023-02-16 | 2023-06-23 | 北京成立科技有限公司 | Aeroengine combustion chamber casing internal pressure test device |
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