CN110879139B - Sealing ring test device with deformation error compensation - Google Patents
Sealing ring test device with deformation error compensation Download PDFInfo
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- CN110879139B CN110879139B CN201911125428.8A CN201911125428A CN110879139B CN 110879139 B CN110879139 B CN 110879139B CN 201911125428 A CN201911125428 A CN 201911125428A CN 110879139 B CN110879139 B CN 110879139B
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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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
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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
- G01N3/18—Performing tests at high or low temperatures
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Abstract
The invention discloses a sealing ring test device with deformation error compensation, which comprises an upper connecting plate and a lower connecting plate, wherein the top end of the upper connecting plate is fixedly connected with the bottom end of an upper pressure plate, the lower connecting plate is placed on the lower pressure plate, the lower connecting plate is right opposite to the upper connecting plate, a sealing ring test piece is placed on the top surface of the lower connecting plate, a sealing ring is connected between the edge of the upper pressure plate and the edge of the lower pressure plate, a main electric heating wire is also arranged on the bottom surface of the lower connecting plate, and the top end of the sealing ring test piece is in close contact with the bottom end of the upper connecting plate; the high-pressure air inlet pipe penetrates through the lower pressure plate and the lower connecting plate to be communicated with the high-pressure cavity, and the internal pressure vent pipe penetrates through the lower pressure plate to be communicated with the inner cavity. The sealing ring test device with deformation error compensation reduces the heat energy, mechanical energy and high-pressure gas energy required by the sealing ring test, improves the measurement precision of the loading force and deformation of a test piece, and improves the controllability of the pressure ring force.
Description
Technical Field
The invention relates to the technical field of aviation test equipment, in particular to a sealing ring test device with deformation error compensation.
Background
When the independent innovation of the Chinese aeroengine is in a key stage, the sealing ring needs to isolate external impurities from the working environment in the aeroengine as a sealing device in the aeroengine, and the working environment of the sealing ring is more and more challenged along with the increasing thrust and combustion efficiency of the aeroengine. Therefore, the test of the simulated working condition of the sealing ring is particularly necessary.
For most of the existing similar test devices, the test modes are that the pressing disc directly acts on the sealing ring, the inside is heated and high-pressure gas is filled, and the test mode has the defects of large measurement error and potential safety hazard. Because the inner space of the testing machine is filled with a large amount of high-pressure gas, the reaction force acting on the upper pressure plate and the lower pressure plate is very large, and the force is resisted by the loading force of the testing machine, so that the testing force which really needs to act on the testing ring is influenced, and a large amount of mechanical energy is wasted. Also, due to the sharp increase of the loading force, the structural strength of the platen must be enhanced, and the mass of the platen is also sharply increased, which greatly increases the heating power required by the testing machine, and easily causes waste of energy.
Because the testing machine is internally provided with large-space high-pressure gas, the testing machine needs to be sealed by a high-pressure container so as to meet the requirement of several megapascals, and the use of the high-pressure container for sealing can cause very large dynamic friction between the pressure plate connecting rod and the high-pressure container, so that the loading force loaded on a test piece cannot be accurately measured.
Therefore, the invention of a novel tester is necessary. Aiming at the problems, the invention provides a sealing ring test device with deformation error compensation, which avoids a series of problems by introducing the test device.
Disclosure of Invention
The invention aims to provide a sealing ring test device with deformation error compensation, which is used for solving the problems in the prior art, reducing heat energy, mechanical energy and high-pressure air energy required by the test, improving the measurement precision of the loading force and deformation of a test piece and improving the controllability of the pressure of a pressure ring.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a sealing ring test device with deformation error compensation, which comprises an upper connecting plate and a lower connecting plate, wherein the top end of the upper connecting plate is fixedly connected with the bottom end of an upper pressure plate, the lower connecting plate is placed on a lower pressure plate, the lower connecting plate is opposite to the upper connecting plate, a sealing ring test piece is placed on the top surface of the lower connecting plate, a sealing ring is connected between the edge of the upper pressure plate and the edge of the lower pressure plate, a main electric heating wire is further arranged on the bottom surface of the lower connecting plate, and the top end of the sealing ring test piece is in close contact with the bottom end of the upper connecting plate; the high-pressure air inlet pipe penetrates through the lower pressure plate and the lower connecting plate to be communicated with a high-pressure cavity, and the high-pressure cavity is a cavity surrounded by the upper connecting plate, the sealing ring test piece, the lower connecting plate, the lower pressure plate, the sealing ring and the upper pressure plate; the connecting plate center is provided with the through-hole down, just the through-hole cover is established on the fore-set at pressure disk top center down, the breather pipe of pressing in passes down the pressure disk communicates with each other with interior cavity, interior cavity does the ring test spare of obturating upper junction plate the lower connecting plate reaches the cavity that the fore-set encloses.
Preferably, the upper connecting plate and the lower connecting plate are high-temperature alloy plates, and the upper connecting plate is connected with the bottom end of the upper pressure plate through bolts.
Preferably, go up the pressure disk with down the pressure disk respectively through the bolt with the sealing ring is connected, go up the pressure disk with be provided with graphite packing pad between the sealing ring, down the pressure disk with be provided with graphite packing pad between the sealing ring.
Preferably, the sealing device further comprises a glass protection cover, a supporting heat insulation pad is arranged at the bottom end of the lower pressing plate, the bottom end of the glass protection cover is connected with the supporting heat insulation pad, the diameter of the upper connecting plate is equal to that of the lower connecting plate, the diameter of the supporting heat insulation pad is larger than or equal to that of the lower connecting plate, and the upper pressing plate, the lower pressing plate, the sealing ring, the upper connecting plate, the lower connecting plate and the sealing ring test piece are all located in the glass protection cover; the top end of the upper pressure plate is provided with a connecting rod, and the connecting rod penetrates through a top end hole of the glass protection cover in the sealing ring test device.
Preferably, the thermocouple probe hole device further comprises a plurality of thermocouple probe holes for placing thermocouple sensors, each thermocouple probe hole comprises a main probe hole located in the upper pressure plate and an auxiliary probe hole located at the top end of the glass protection cover and facing the main probe hole, and the bottom end of the main probe hole is connected with the top end of the upper connecting plate.
Preferably, a cover is disposed on the secondary probing hole.
Preferably, auxiliary electric heating wires are uniformly distributed at the top end of the lower pressing disc.
Preferably, the top of going up the pressure disk still is provided with displacement grating sensor, the top of glass safety cover corresponds displacement grating sensor is provided with the probe hole.
Preferably, a limiting ring positioned on the inner side of the sealing ring test piece is further arranged on the lower connecting plate.
Compared with the prior art, the sealing ring test device with deformation error compensation has the following technical effects:
the sealing ring test device with deformation error compensation reduces the heat energy, mechanical energy and high-pressure gas energy required by the sealing ring test, improves the measurement precision of the loading force and deformation of a test piece, and improves the controllability of the pressure ring force. The sealing ring test device with deformation error compensation has the advantages that the sealing performance of the high-pressure cavity is good, the reliability is high, the flow of the high-pressure air inlet pipe is the air inlet flow of the high-pressure cavity, the measurement is true and measurable, the air inlet pipeline is simplified, and the measurement accuracy of the leakage amount is improved. The diameter of the supporting heat insulation pad is equal to that of the main body bearing part of the lower pressure plate, so that the lower pressure plate can be uniformly supported, the lower pressure plate and the upper pressure plate cannot deform in the test process, the problems that the upper pressure plate and the lower pressure plate deform seriously due to high pressure bearing between the upper pressure plate and the lower pressure plate, displacement measurement deviation is caused by overlarge stress of a loading machine and the like are solved, and the deformation can be accurately measured by directly arranging a displacement grating sensor at the top end of the upper pressure plate; the high pressure does not need to be maintained in the glass protective cover, the sealing difficulty of the pressure rod and each measuring probe hole caused by the high pressure in the protective cover is avoided, the uncertain influence of dynamic friction during the test is eliminated, and the pressure of the pressure ring can be truly and controllably. The high-pressure cavity is small in size, so that the energy of high-pressure gas is greatly reduced, and the safety of the test is also ensured. The main electric heating wire is arranged on the lower connecting plate, so that the rapid heating of the sealing ring test piece is realized, the auxiliary electric heating wires are distributed in three sectors on the lower pressing plate, the uniformity of the heating process is ensured, the heat exchange between the main body part of the test device and the outside can be reduced, the heat dissipation capacity is reduced, and the heating efficiency is improved; a plurality of thermocouple probe holes distributed along the radial direction of the upper pressure plate can conveniently and accurately measure the temperature near the sealing ring test pieces with different sizes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a first structural schematic diagram of a sealing ring test device with deformation error compensation according to the present invention;
FIG. 2 is a second structural schematic diagram of the sealing ring test device with deformation error compensation according to the present invention;
FIG. 3 is a schematic view of a partial structure of the sealing ring test device with deformation error compensation according to the present invention;
FIG. 4 is a bottom view of a lower connecting plate in the sealing ring test device with deformation error compensation of the present invention;
FIG. 5 is a top view of a lower platen in the seal ring test apparatus with distortion error compensation of the present invention;
wherein: the device comprises a connecting rod 1, an upper pressing disc 2, an upper connecting plate 3, a limiting ring 4, a sealing ring 5, a lower connecting plate 6, a lower pressing disc 7, a supporting heat insulation pad 8, a sealing ring 9, a graphite sealing gasket 10, a glass protective cover 11, a high-pressure air inlet pipe 12, an internal pressure vent pipe 13, a thermocouple sensor 14, a thermocouple probe 15, a cover 16, a main electric heating wire 17, an auxiliary electric heating wire 18 and a displacement grating sensor 19.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The invention aims to provide a sealing ring test device with deformation error compensation, which is used for solving the problems in the prior art, reducing heat energy, mechanical energy and high-pressure air energy required by the test, improving the measurement precision of the loading force and deformation of a test piece and improving the controllability of the pressure of a pressure ring.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 5: the sealing ring test device with deformation error compensation comprises an upper connecting plate 3 and a lower connecting plate 6, wherein the upper connecting plate 3 and the lower connecting plate 6 are both high-temperature alloy plates, the upper connecting plate 3 is connected with the bottom end of an upper pressure plate 2 through bolts, the lower connecting plate 6 is placed on a lower pressure plate 7, the lower connecting plate 6 is right opposite to the upper connecting plate 3, a sealing ring test piece 5 is placed on the top surface of the lower connecting plate 6, and the top end of the sealing ring test piece 5 is in tight contact with the bottom end of the upper connecting plate 3; go up and be connected with sealing ring 9 between the edge of pressure disk 2 and the edge of holding down pressure disk 7, go up pressure disk 2 and holding down pressure disk 7 and be connected with sealing ring 9 through the bolt respectively, go up and be provided with the sealed pad 10 of graphite between pressure disk 2 and the sealing ring 9, be provided with the sealed pad 10 of graphite between holding down pressure disk 7 and the sealing ring 9, the sealed pad 10 of graphite is used for improving the leakproofness between sealing ring 9 and last pressure disk 2, holding down pressure disk 7.
A cavity surrounded by the upper connecting plate 3, the sealing ring test piece 5, the lower connecting plate 6, the lower pressing disc 7, the sealing ring 9 and the upper pressing disc 2 is a high-pressure cavity, and a high-pressure air inlet pipe 12 penetrates through the lower pressing disc 7 and the lower connecting plate 6 to be communicated with the high-pressure cavity; a through hole is formed in the center of the lower connecting plate 6 and is sleeved on a top pillar in the center of the top end of the lower pressure plate 7, a cavity surrounded by the sealing ring test piece 5, the upper connecting plate 3, the lower connecting plate 6 and the top pillar is an inner cavity, and the inner pressure vent pipe 13 penetrates through the lower pressure plate 7 and is communicated with the inner cavity; the inner cavity is communicated with the atmosphere through an internal pressure vent pipe 13, so that the air pressure at the inner side of the sealing ring test piece 5 is the same as the atmospheric pressure, the air pressure at the outer side of the sealing ring test piece 5 is the air pressure in the high-pressure cavity, and high-pressure gas can be injected into the high-pressure cavity through a high-pressure air inlet pipe 12, so that the pressure in the high-pressure cavity meets the test requirement; the space volume of the high-pressure cavity is extremely small, the heating working medium needing to be heated is greatly reduced, and the heat energy is greatly saved. The gas in the high-pressure cavity can only be leaked out through gaps between the sealing ring test piece 5 and the upper connecting plate 3 and the lower connecting plate 6, and the leaked gas flow is the leakage amount of the test piece under the current test condition. In order to ensure that the pressure of the high-pressure cavity is constant, air is continuously supplemented to the high-pressure cavity through the high-pressure air inlet pipe 12 so as to counteract air leakage of the sealing ring, and the supplemented air flow is the leakage quantity of the sealing ring. Therefore, the air flow of the high pressure intake pipe 12 is measured only by an instrument, and the air flow of the high pressure intake pipe 12 measured after the test enters the steady state is the leakage amount of the seal ring.
Referring to fig. 4 and 5, a main electric heating wire 17 is arranged on the bottom surface of the lower connecting plate 6, auxiliary electric heating wires 18 are uniformly distributed on the top end of the lower pressing plate 7, the main electric heating wire 17 is arranged on the lower connecting plate 6, rapid heating of the sealing ring test piece 5 is realized, and the auxiliary electric heating wires are distributed in three sectors on the lower pressing plate 7, so that uniformity of a heating process is guaranteed.
The sealing ring test device with deformation error compensation further comprises a glass protection cover 11, a supporting heat insulation pad 8 is arranged at the bottom end of the lower pressing disc 7, the bottom end of the glass protection cover 11 is connected with the supporting heat insulation pad 8, the diameter of the upper connecting plate 3 is equal to that of the lower connecting plate 6, the diameter of the lower connecting plate 6 is equal to that of a top force bearing surface of the lower pressing disc 7, the diameter of the supporting heat insulation pad 8 is equal to that of the lower connecting plate 6, and the upper pressing disc 2, the lower pressing disc 7, the sealing ring 9, the upper connecting plate 3, the lower connecting plate 6 and the sealing ring test piece 5 are all located in the glass protection cover 11; the top of going up pressure disk 2 is provided with connecting rod 1, and connecting rod 1 passes the top trompil of glass safety cover 11 among the ring test device of obturating, and the setting of glass safety cover 11 can reduce test device main part and external heat exchange, reduce the heat dissipation capacity, improves heating efficiency.
The sealing ring test device with deformation error compensation further comprises a plurality of thermocouple probing holes 15 used for placing the thermocouple sensors 14, each thermocouple probing hole 15 comprises a main probing hole located in the upper pressure plate 2 and an auxiliary probing hole located on the top end of the glass protection cover 11 and right facing the main probing hole, the bottom end of the main probing hole is connected with the top end of the upper connecting plate 3, and the thermocouple probing holes 15 distributed radially along the upper pressure plate 2 can conveniently and accurately measure the temperature near the sealing ring test piece 5 with different sizes. A cover 16 is provided on the sub-probe hole, and the cover 16 is tightly closed to the thermocouple probe hole 15 which is not used, to reduce heat loss.
The top end of the upper pressure plate 2 is also provided with a displacement grating sensor 19, the top end of the glass protection cover 11 is provided with a probing hole corresponding to the displacement grating sensor 19, and the displacement grating sensor 19 penetrates through the probing hole and can freely move up and down in the probing hole, so that the displacement grating sensor 19 is prevented from interfering with the glass protection cover 11 when the upper pressure plate 2 moves up and down; a force load sensor is mounted on the connecting rod 1 of the upper platen 2 for measuring the force F applied to the upper platen 2. The force F comprises 5 parts: the device comprises an upper pressure plate 2, a gravity G1 of a connecting rod 1 and a bolt connecting flange, a gravity G2 of an upper high-temperature alloy adapter device, an elastic force F1 on a sealing ring 9, a pressure F2 of high-pressure chamber air to the upper pressure plate 2 and an elastic force F3 of a test piece to the upper pressure plate 2. Wherein, F is F1+ F2+ F3-G1-G2 (1).
The working principle of the sealing ring test device with deformation error compensation of the embodiment is as follows:
before the test, firstly, a group of pressure and sealing ring 9 deformation relations are measured without sealing ring test piece 5 and high-pressure gas, and actually measured are F1-G1-G2 and sealing ring 9 deformation relations; f2 is caused by the action of the air pressure in the high-pressure chamber on the test adapter, which force is related to the pressure P of the high-pressure chamber and the equivalent cross-sectional area a in the horizontal plane, where F2 is P × a. The pressure P can be accurately measured by a pressure sensor on a pipeline communicated with the high-pressure cavity; the equivalent cross-sectional area a can be calculated from the geometric dimensions by a projection method, or can be obtained by measurement and conversion in an experimental manner, so that F2 can be directly calculated. The pressure F3 acting on the test piece can be obtained according to formula (1).
In the initial stage of the test, the test temperature is heated to 800 ℃, the displacement zero point is manually adjusted after the test temperature is stabilized so as to compensate for thermal deformation, and the thermocouple sensors 14 are specifically arranged in which thermocouple probe holes 15 and are reasonably selected according to parameters such as the size of the sealing ring test piece 5. The displacement grating sensor 19 aims at the 5 positions of the ring test piece of obturating, the diameter of supporting the heat insulating pad 8 equals to the diameter of the main body bearing part of the lower pressure plate 7, can carry out even support to the lower pressure plate 7, make the lower pressure plate 7 and the upper pressure plate 2 not deform in the test process, it leads to the pressure plate 2 and the lower pressure plate 7 to deform seriously to have avoided bearing the high pressure between the upper pressure plate 2 and the lower pressure plate 7, the loader atress brings the displacement measurement deviation scheduling problem excessively, thereby make directly set up the displacement grating sensor 19 on the top of the upper pressure plate 2 and just can accurately measure the deflection.
Still be provided with the spacing ring 4 that is located the ring test piece 5 inboard of obturating on connecting plate 6 down, the height that highly is less than ring test piece 5 of obturating of spacing ring 4, in the experimentation, spacing can prevent that upper pressure disk 2 and lower pressure disk 7 from excessively moving, causes the destruction to the test piece, can acquire the reference position through spacing ring 4 moreover.
In the description of the present invention, it should be noted that the terms "center", "top", "bottom", "inside", "outside", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (2)
1. The utility model provides a take ring test device that obturages of deformation error compensation which characterized in that: the sealing device comprises an upper connecting plate and a lower connecting plate, wherein the top end of the upper connecting plate is fixedly connected with the bottom end of an upper pressure plate, the lower connecting plate is placed on a lower pressure plate, the lower connecting plate is opposite to the upper connecting plate, a sealing ring test piece is placed on the top surface of the lower connecting plate, a sealing ring is connected between the edge of the upper pressure plate and the edge of the lower pressure plate, a main electric heating wire is further arranged on the bottom surface of the lower connecting plate, and the top end of the sealing ring test piece is in close contact with the bottom end of the upper connecting plate; the high-pressure air inlet pipe penetrates through the lower pressure plate and the lower connecting plate to be communicated with a high-pressure cavity, and the high-pressure cavity is a cavity surrounded by the upper connecting plate, the sealing ring test piece, the lower connecting plate, the lower pressure plate, the sealing ring and the upper pressure plate; a through hole is formed in the center of the lower connecting plate and is sleeved on a top post in the center of the top end of the lower pressure plate, an internal pressure vent pipe penetrates through the lower pressure plate and is communicated with an inner cavity, and the inner cavity is a cavity surrounded by the sealing ring test piece, the upper connecting plate, the lower connecting plate and the top post; the upper pressure plate and the lower pressure plate are respectively connected with the sealing ring through bolts, a graphite sealing gasket is arranged between the upper pressure plate and the sealing ring, and a graphite sealing gasket is arranged between the lower pressure plate and the sealing ring; the sealing device is characterized by further comprising a glass protection cover, a supporting heat insulation pad is arranged at the bottom end of the lower pressing plate, the bottom end of the glass protection cover is connected with the supporting heat insulation pad, the diameter of the upper connecting plate is equal to that of the lower connecting plate, the diameter of the supporting heat insulation pad is larger than or equal to that of the lower connecting plate, and the upper pressing plate, the lower pressing plate, the sealing ring, the upper connecting plate, the lower connecting plate and the sealing ring test piece are all located in the glass protection cover; a connecting rod is arranged at the top end of the upper pressure plate and penetrates through a top opening of the glass protection cover in the sealing ring test device; the thermocouple probe holes are used for placing thermocouple sensors, each thermocouple probe hole comprises a main probe hole positioned in the upper pressure plate and an auxiliary probe hole positioned at the top end of the glass protective cover and opposite to the main probe hole, and the bottom end of the main probe hole is connected with the top end of the upper connecting plate; a cover is arranged on the auxiliary probing hole; auxiliary electric heating wires are uniformly distributed at the top end of the lower pressing disc; the top end of the upper pressure plate is also provided with a displacement grating sensor, and the top end of the glass protective cover is provided with a probing hole corresponding to the displacement grating sensor; and the lower connecting plate is also provided with a limiting ring positioned at the inner side of the sealing ring test piece.
2. The seal ring test device with deformation error compensation of claim 1, wherein: the upper connecting plate and the lower connecting plate are high-temperature alloy plates, and the upper connecting plate is connected with the bottom end of the upper pressure plate through bolts.
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| CN201911125428.8A CN110879139B (en) | 2019-11-18 | 2019-11-18 | Sealing ring test device with deformation error compensation |
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| CN201911125428.8A CN110879139B (en) | 2019-11-18 | 2019-11-18 | Sealing ring test device with deformation error compensation |
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| CN112283349A (en) * | 2020-10-12 | 2021-01-29 | 南昌航空大学 | Bidirectional W-shaped metal thin-wall sealing ring |
| CN112363479B (en) * | 2020-12-09 | 2022-04-08 | 南昌航空大学 | Digital communication transmission method and system between field devices |
| CN113865874A (en) * | 2021-10-26 | 2021-12-31 | 南昌航空大学 | Sealing ring testing machine with air pressure loading function |
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| CN104359635A (en) * | 2014-11-24 | 2015-02-18 | 中国航空动力机械研究所 | Multifunctional all-working-condition metal elastic sealing ring testing device |
| CN204731113U (en) * | 2015-03-26 | 2015-10-28 | 自贡市佳世特密封制品有限公司 | A kind of sealing ring material high-temperature behavior pick-up unit |
| CN105157975B (en) * | 2015-09-11 | 2017-10-13 | 南昌航空大学 | The method that ring axial compression displacement deflection is obturaged in control and measurement |
| CN105203006B (en) * | 2015-09-11 | 2017-10-13 | 南昌航空大学 | Obturage the parallel installation of pressing disc in the-loop test bed high temperature furnace and Parallel testing method |
| CN110441047B (en) * | 2019-09-10 | 2020-11-20 | 南昌航空大学 | Sealing ring test switching device based on corrugated ring |
| CN110441046B (en) * | 2019-09-10 | 2021-02-02 | 北京航空航天大学 | Sealing ring test switching device based on graphite sealing ring |
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