CN113068446B - Fatigue life testing device for composite diaphragm capsule under combination of multiple internal pressures and external pressures - Google Patents
Fatigue life testing device for composite diaphragm capsule under combination of multiple internal pressures and external pressures Download PDFInfo
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- CN113068446B CN113068446B CN201010049263.3A CN201010049263A CN113068446B CN 113068446 B CN113068446 B CN 113068446B CN 201010049263 A CN201010049263 A CN 201010049263A CN 113068446 B CN113068446 B CN 113068446B
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Abstract
A fatigue life test device for a multi-internal and external pressure combined lower composite diaphragm capsule comprises a vibration table support, a large support, a vibration table moving coil, a transfer plate and a large connecting rod, wherein the test device is symmetrically divided into two parts by the large connecting rod, and each part comprises an upper shell, a metal sealing ring, a composite diaphragm capsule, a small support, a lower shell, a small connecting rod, a bellows component, a spring seat, a balance spring, a transverse frame, an adjusting screw sleeve, an inflation tube, a transverse beam and an acceleration sensor; the invention overcomes the defects of the prior art, can simulate the fatigue life of the composite diaphragm capsule under various pressure load combinations and displacement load low-temperature working conditions, and conforms to the real working conditions; the invention uses the vibration table to provide high-frequency displacement load, and can quickly finish the fatigue life of the sensitive element with long service life.
Description
Technical Field
The invention relates to a test device for testing the fatigue life of a composite diaphragm capsule for a liquid rocket.
Background
The fatigue life device for the common sensitive element mainly comprises a ventilation shell and a limiting shell, the sensitive element is arranged in the limiting shell, then a sealing element is added between the sensitive element and the ventilation shell to form a sealed cavity, and finally the two shells are connected together through threads. Compressed air is introduced from the filler neck of the ventilation shell through the inflation solenoid valve to apply air pressure load, and the sensitive element generates displacement under the action of air pressure due to the pressure difference at the two ends of the sensitive element; then the air is discharged from the filler neck of the ventilation shell through an air discharge electromagnetic valve, no pressure difference exists between two ends of the sensitive element, and the element is restored to the initial position. The fatigue life test is completed in this way. The limit shell limits the stroke of the test piece and prevents damage, the inflation solenoid valve and the deflation solenoid valve are controlled by the solenoid valve controller, the inflation and deflation time can be adjusted according to test requirements, and the controller has a counting function.
There are three major disadvantages: a. the pressure simulation of a plurality of working chambers can not be realized simultaneously, and the pressure simulation is not accordant with the real working environment of the valve. b. Because the opening and closing frequency of the electromagnetic valve cannot be too high (less than 1Hz), the efficiency of fatigue life is low, and when the fatigue life reaches millions of times, the time is very long.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a compound diaphragm capsule fatigue life test device under combination of many internal and external pressures, solves the problem that the fatigue life test device in the past can not simulate sensitive element low temperature operating mode and fatigue life test time overlength.
The technical solution of the invention is as follows: a fatigue life test device for a multi-internal and external pressure combined lower composite diaphragm capsule comprises a vibration table support, a large support, a vibration table moving coil, a transfer plate and a large connecting rod, wherein the test device is symmetrically divided into two parts by the large connecting rod, and each part comprises an upper shell, a metal sealing ring, a composite diaphragm capsule, a small support, a lower shell, a small connecting rod, a bellows component, a spring seat, a balance spring, a transverse frame, an adjusting screw sleeve, an inflation tube, a transverse beam and an acceleration sensor;
the upper end of the large connecting rod is tightly pressed and connected with the cross beam through double nuts, the lower end of the large connecting rod is connected with the adapter plate, and the adapter plate is fixedly connected with the movable coil of the vibration table; two ends of the cross beam are tightly pressed and connected with a small connecting rod through double nuts, an acceleration sensor is installed at the upper end of the small connecting rod, an adjusting threaded sleeve is sleeved on the small connecting rod, the outer part of the adjusting threaded sleeve is screwed with a cross frame, the cross frame is tightly pressed on a large support, and a balance spring is installed between the lower end of the adjusting threaded sleeve and the middle protruding part of the small connecting rod through a spring seat; the upper end and the lower end of the bellows component are respectively connected with the middle protruding part of the small connecting rod and the upper end of the upper shell and sealed through a metal sealing ring, the two sides of the upper shell are connected with the small supports, the small supports are connected and fixed with the large supports, the large supports are installed on the support of the vibration table, the lower part of the upper shell is fixedly connected with the lower shell and sealed through the metal sealing ring, a cavity is formed between the upper shell and the lower shell, the composite bellows is placed in the cavity, the lower part of the small connecting rod abuts against the composite bellows, the upper cavity, the inner cavity and the lower cavity of the composite bellows are connected with an inflation tube.
Compared with the prior art, the invention has the beneficial effects that:
(1) the fatigue life of the composite diaphragm capsule under various pressure load combinations and displacement load low-temperature working conditions can be simulated, and the real working conditions are met; the invention uses the vibration table to provide high-frequency displacement load, and can quickly finish the fatigue life of the sensitive element with long service life.
(2) The fatigue life test of the composite diaphragm capsule sensitive device in the low-temperature environment can be realized by arranging the low-temperature container and completely placing the devices in the large support of the test device in the low-temperature container and injecting a low-temperature medium into the container during the test, and the device is simple and reliable.
Drawings
FIG. 1 is a partial cross-sectional view of the present invention;
FIG. 2 is a schematic view of the present invention;
fig. 3 is a schematic structural diagram of a composite bellows according to the present invention.
Detailed Description
As shown in fig. 1 and 2, a fatigue life test device for a composite bellows under a combination of multiple internal pressures and external pressures comprises a vibration table support 1, a large support 2, a vibration table moving coil 3, an adapter plate 4 and a large connecting rod 18, wherein the test device is symmetrically divided into two parts by the large connecting rod 18, and each part comprises a lower shell 5, a metal sealing ring 6, a composite bellows 7, a small support 8, an upper shell 9, a small connecting rod 10, a bellows assembly 11, a spring seat 12, a balance spring 13, a cross frame 14, an adjusting threaded sleeve 15, an inflation tube 16, a cross beam 17 and an acceleration sensor 19;
the upper end of a large connecting rod 18 is tightly pressed by double nuts to be connected with a cross beam 17, the lower end of the large connecting rod 18 is connected with an adapter plate 4, and the adapter plate 4 is fixedly connected with a vibrating table moving coil 3; two ends of a cross beam 17 are tightly pressed and connected with a small connecting rod 10 through double nuts, an acceleration sensor 19 is installed at the upper end of the small connecting rod 10, an adjusting threaded sleeve 15 is sleeved on the small connecting rod 10, a cross frame 14 is screwed outside the adjusting threaded sleeve 15, the cross frame 14 is tightly pressed on the large support 2, and a balance spring 13 is installed between the lower end of the adjusting threaded sleeve 15 and the middle protruding part of the small connecting rod 10 through a spring seat 12; the upper end and the lower end of a corrugated pipe assembly 11 are respectively connected with a middle protruding part of a small connecting rod 10 and the upper end of an upper shell 9, two sides of the upper shell 9 are connected with small supports 8, the small supports 8 are fixedly connected with a large support 2, the large support 2 is installed on a vibration table support 1, the lower part of the upper shell 9 is fixedly connected with a lower shell 5, a cavity is formed between the upper shell 9 and the lower shell 5, a composite diaphragm capsule 7 is placed in the cavity, the lower part of the small connecting rod 10 is propped against the composite diaphragm capsule 7, an upper cavity a, an inner cavity b and a lower cavity c of the composite diaphragm capsule 7 are connected with an inflation tube 16, the inflation tube 16 is connected with an air source, and metal sealing rings 6 are installed between the upper shell 5 and the lower shell 9, between the lower shell 9 and the corrugated pipe assembly 11, between the composite diaphragm. The bellows component 11 comprises a welding bellows and a flange, and two ends of the welding bellows are respectively connected with the protruding part of the small connecting rod 10 and the upper end of the lower shell 9 through the flange.
As shown in fig. 2, the apparatus of the present invention may further include a cryogenic container 20, a thermal insulation layer is disposed outside the cryogenic container 20, and during the test, the two parts of the apparatus, i.e., the left part and the right part, are respectively installed in the two cryogenic containers 20, and a cryogenic medium such as liquid nitrogen is injected into the containers, so that the fatigue life test of the composite bellows 7 in a cryogenic environment can be realized.
As shown in fig. 3, the composite bellows 7 is a structure, and in practical application, the shape of the cavity formed between the upper casing 9 and the lower casing 5 is matched with the shape of the composite bellows to be tested and sealed.
The device connecting pipe mouth is connected with an air source through an inflation pipe 16, the air source is adjusted, pressure air under the actual working condition of the composite bellows 7 is applied to each cavity (an upper cavity a, an inner cavity b and a lower cavity c), then the air source is closed, and the pressure of each cavity is observed by using a pressure gauge. In the pressurizing process, the balance spring 13 needs to be continuously adjusted through the adjusting screw sleeve 15, and the small connecting rod 10 presses the composite diaphragm box 7 downwards under the action of spring force so as to balance the force generated by the composite diaphragm box 7 under the action of air pressure and prevent the force from acting on the movable coil 3 of the vibration table to damage the vibration table. After the adjustment is finished, observing the pressure value of the pressure gauge, and if the pressure is not reduced, indicating that the air tightness is good; if the pressure is reduced, the leakage is indicated. Before the low-temperature test, each cavity is filled with helium gas at 0.05MPa for 10s, and then is emptied, and the filling and the emptying are repeated, so that each cavity is filled with helium gas (the boiling point is 4K) under the working pressure. And then injecting liquid nitrogen into a liquid nitrogen tank, and precooling for 20min to reduce the temperature of the composite membrane box 7 to the working condition temperature (77K). An acceleration sensor 19 is arranged on the small connecting rod 10, the vibration table is started, and the large connecting rod 18 of the vibration table vibrates with the displacement load under the working condition as the maximum amplitude, so that the displacement load is provided for the composite diaphragm capsule 7. The vibration frequency of the vibration table is high, and high-frequency cyclic displacement can be provided. When the pressure of the closed cavity is obviously reduced, the fatigue failure of the elastic sensitive element can be judged. The product of the vibration frequency and the working time of the vibration table is the fatigue life of the sensitive element.
The invention has not been described in detail in part of the common general knowledge of those skilled in the art.
Claims (3)
1. The utility model provides a compound diaphragm capsule fatigue life test device under combination of many internal and external pressures which characterized in that: the device comprises a vibration table support (1), a large support (2), a vibration table moving coil (3), an adapter plate (4) and a large connecting rod (18), wherein the test device is symmetrically divided into two parts by the large connecting rod (18), and each part comprises a lower shell (5), a metal sealing ring, a composite membrane box (7), a small support (8), an upper shell (9), a small connecting rod (10), a corrugated pipe assembly (11), a spring seat (12), a balance spring (13), a transverse frame (14), an adjusting swivel nut (15), an inflation pipe (16), a cross beam (17) and an acceleration sensor (19); the upper end of a large connecting rod (18) is tightly pressed and connected with a cross beam (17) through double nuts, the lower end of the large connecting rod (18) is connected with an adapter plate (4), and the adapter plate (4) is fixedly connected with a vibrating table moving coil (3); two ends of a cross beam (17) are tightly pressed and connected with a small connecting rod (10) through double nuts, an acceleration sensor (19) is installed at the upper end of the small connecting rod (10), an adjusting threaded sleeve (15) is sleeved on the small connecting rod (10), the outer part of the adjusting threaded sleeve (15) is in threaded connection with a cross frame (14), the cross frame (14) is tightly pressed on a large support (2), and a balance spring (13) is installed between the lower end of the adjusting threaded sleeve (15) and the middle protruding part of the small connecting rod (10) through a spring seat (12); the upper end and the lower end of a bellows assembly (11) are respectively connected with a middle protruding part of a small connecting rod (10) and the upper end of an upper shell (9) and sealed by a metal sealing ring, two sides of the upper shell (9) are connected with small supports (8), the small supports (8) are fixedly connected with a large support (2), the large support (2) is installed on a vibration table support (1), the lower part of the upper shell (9) is fixedly connected with a lower shell (5) and sealed by the metal sealing ring, a cavity is formed between the upper shell (9) and the lower shell (5), a composite bellows (7) is placed in the cavity, the lower part of the small connecting rod (10) is propped against the composite bellows (7), the upper cavity, the inner cavity and the lower cavity of the composite bellows (7) are connected with an inflation tube (16), and the inflation tube (16) is.
2. The fatigue life testing device for the composite diaphragm capsule under the combination of multiple internal pressures and external pressures according to claim 1, is characterized in that: the device comprises a large support (2) and is characterized by further comprising a low-temperature container (20), a heat insulation layer is arranged outside the low-temperature container (20), devices of the left part and the right part of the test device in the large support (2) are respectively placed in the two low-temperature containers (20), and two ends of the low-temperature container (20) are fixed on the large support (2).
3. The fatigue life testing device for the composite diaphragm capsule under the combination of multiple internal pressures and external pressures according to claim 1, is characterized in that: the bellows assembly (11) comprises a welding bellows and a flange, wherein two ends of the welding bellows are respectively connected with the protruding part of the small connecting rod (10) and the upper end of the lower shell (9) through the flange.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010049263.3A CN113068446B (en) | 2010-07-30 | 2010-07-30 | Fatigue life testing device for composite diaphragm capsule under combination of multiple internal pressures and external pressures |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010049263.3A CN113068446B (en) | 2010-07-30 | 2010-07-30 | Fatigue life testing device for composite diaphragm capsule under combination of multiple internal pressures and external pressures |
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| CN113068446B true CN113068446B (en) | 2013-09-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112033662A (en) * | 2020-09-21 | 2020-12-04 | 北京海德利森科技有限公司 | Diaphragm capsule life test system |
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2010
- 2010-07-30 CN CN201010049263.3A patent/CN113068446B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112033662A (en) * | 2020-09-21 | 2020-12-04 | 北京海德利森科技有限公司 | Diaphragm capsule life test system |
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