CN113068447B

CN113068447B - Fatigue examination test device for diaphragm capsule under liquid nitrogen temperature zone

Info

Publication number: CN113068447B
Application number: CN201010049241.7A
Authority: CN
Inventors: 郭雷; 陶凯; 赵涛; 王跃平; 耿屹; 石峰; 曹荣
Original assignee: Beijing Institute of Astronautical Systems Engineering
Current assignee: Beijing Institute of Astronautical Systems Engineering
Priority date: 2010-07-30
Filing date: 2010-07-30
Publication date: 2013-06-19
Anticipated expiration: 2030-07-30

Abstract

A fatigue examination test device for a diaphragm capsule at a liquid nitrogen temperature zone comprises a diaphragm capsule inner cavity monitoring function subsystem consisting of a pressure measuring pipeline, a manual switch and a pressure gauge; the bellows rigid connection subsystem consists of an air cylinder, a bellows limiting tool and a bellows connecting tool; the electric control subsystem consists of a stabilized voltage supply, a two-way electromagnetic valve controller, a first electromagnetic valve and a second electromagnetic valve. The device controls a first electromagnetic valve and a second electromagnetic valve to keep opposite working states through a double-circuit electromagnetic valve controller in an electric control subsystem in a liquid nitrogen temperature region, ensures that a cylinder in a rigid connection subsystem compresses and stretches a large-size diaphragm capsule to perform reciprocating motion, and simultaneously monitors the pressure change of the inner cavity of the diaphragm capsule through a pressure gauge in a diaphragm capsule inner cavity monitoring function subsystem. The device provided by the invention is simple in structure, solves the problem that the fatigue examination of the large-size diaphragm capsule under the liquid nitrogen temperature region cannot be carried out due to the limitation of displacement in the conventional test technology, and plays a role in promoting the development of the low-temperature test technology.

Description

Fatigue examination test device for diaphragm capsule under liquid nitrogen temperature zone

Technical Field

The invention relates to a diaphragm capsule fatigue examination test device under a liquid nitrogen temperature zone.

Background

In the past rocket model experiments in China, the fatigue examination of the diaphragm capsule is mainly performed by a vibration table fatigue examination method. The advantages of this test method are: the frequency adjustable range is large, the time control is accurate, and the continuous working reliability is high. The disadvantages are that: the displacement is small, the limit displacement can only reach 18mm, the fatigue assessment displacement requirement of the rocket-type bellows can only be met, and the liquid nitrogen temperature area is difficult to design and install, has large potential safety hazard and is not suitable for the fatigue assessment of the liquid nitrogen temperature area of the bellows.

In the current development of novel rocket models, the height of the novel capsule is increased by more than 80%, the displacement required by fatigue examination is correspondingly increased by more than 50%, and the method based on the vibration table fatigue examination is not suitable for the fatigue examination of the liquid nitrogen temperature region and cannot meet the requirement of the displacement of the fatigue examination, so that a novel test method needs to be designed for carrying out the fatigue examination test of the novel large-size capsule in the liquid nitrogen temperature region.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the device overcomes the defects of the prior art and provides the fatigue examination test device for the diaphragm capsule under the liquid nitrogen temperature region, which has a simple structure and small displacement limit.

The technical solution of the invention is as follows: a diaphragm capsule fatigue examination test device under a liquid nitrogen temperature zone comprises a voltage-stabilized power supply, a two-way electromagnetic valve controller, an electromagnetic valve control line, a pressurizing pipeline, a first electromagnetic valve, a second electromagnetic valve, a cylinder, a diaphragm capsule limiting tool, a diaphragm capsule connecting tool, a liquid nitrogen tank, a pressure measuring pipeline, a manual switch, a pressure gauge and a pressure test bed; the stabilized voltage power supply supplies power to the two-way electromagnetic valve controller, the two-way electromagnetic valve controller controls the first electromagnetic valve and the second electromagnetic valve to keep opposite working states through an electromagnetic valve control line, the input end of the first electromagnetic valve and the input end of the second electromagnetic valve are connected with the first pressure output end of the pressure test bed through a pressurizing pipeline, the output end of the first electromagnetic valve and the output end of the second electromagnetic valve are respectively connected to two pressure input ends on the cylinder, and the two pressure input ends are respectively positioned on two sides of a piston in the cylinder; the diaphragm capsule connecting tool is fixed on the diaphragm capsule limiting tool, two ends of the diaphragm capsule connecting tool are respectively connected with the piston in the cylinder and the upper surface of the diaphragm capsule, and the diaphragm capsule limiting tool, the diaphragm capsule connecting tool and the diaphragm capsule are all arranged in a liquid nitrogen tank; a second pressure output end of the pressure test bed is connected to the inside of the diaphragm capsule through a pressure measuring pipeline, a manual switch is arranged on the pressure measuring pipeline, and a pressure gauge is connected to the pressure measuring pipeline and used for measuring the gas pressure inside the diaphragm capsule; during the test, fill into helium from the second pressure output of pressure test platform through the pressure-measuring pipeline to the diaphragm chamber and replace, close manual switch after the pressure of helium satisfies the test requirement in the diaphragm chamber, then pour into liquid nitrogen into the liquid nitrogen groove, set up the operating time of first solenoid valve and second solenoid valve, make the gas of the first pressure output of pressure test platform act on the piston in the cylinder through first solenoid valve and second solenoid valve respectively, make the piston reciprocate from top to bottom according to the operating time that sets up, thereby carry out low temperature fatigue examination to the diaphragm chamber.

Compared with the prior art, the invention has the advantages that: the testing device disclosed by the invention is simple in structure, the diaphragm capsule is placed in the liquid nitrogen tank and moves up and down in a reciprocating manner under the action of the air cylinder to perform fatigue testing by matching the diaphragm capsule limiting tool, the diaphragm capsule connecting tool and the air cylinder, the compression and tension distances can be adjusted at any time according to the heights of the diaphragm capsules with various specifications, the working frequency can be adjusted within a certain range according to the fatigue examination requirement, the limitation of displacement during the fatigue testing of the diaphragm capsule is broken through, the problem that the conventional testing technology cannot perform fatigue examination on the large-size diaphragm capsule in a liquid nitrogen temperature region is solved, and the development of the low-temperature testing technology is promoted.

Drawings

Fig. 1 is a schematic block diagram of the apparatus of the present invention.

Detailed Description

As shown in fig. 1, the principal components of the fatigue assessment testing device for a diaphragm capsule under a liquid nitrogen temperature zone of the invention include a voltage-stabilized power supply 1, a two-way solenoid valve controller 2, a solenoid valve control line 3, a pressurizing pipeline 4, a first solenoid valve 5, a second solenoid valve 6, a cylinder 7, a diaphragm capsule limiting tool 8, a diaphragm capsule connecting tool 9, a liquid nitrogen tank 11, a pressure measuring pipeline 12, a manual switch 13, a pressure gauge 14 and a pressure testing table 15. These components can be divided into three subsystems: a bellows inner cavity monitoring function subsystem consisting of a pressure measuring pipeline 12, a manual switch 13 and a pressure gauge 14; a bellows rigid connection subsystem consisting of a cylinder 7, a bellows limiting tool 8 and a bellows connecting tool 9; the electric control subsystem consists of a stabilized voltage power supply 1, a two-way electromagnetic valve controller 2, a first electromagnetic valve 5 and a second electromagnetic valve 6. When the device is in a liquid nitrogen temperature zone, the first electromagnetic valve 5 and the second electromagnetic valve 6 are controlled to keep opposite working states through the two-way electromagnetic valve controller 2 in the electrical control subsystem, so that the air cylinder 7 in the rigid connection subsystem can compress and stretch the large-size diaphragm capsule 10 to move back and forth, and meanwhile, the pressure gauge 14 in the diaphragm capsule inner cavity monitoring function subsystem can monitor the pressure change of the inner cavity of the diaphragm capsule 10.

Constant voltage power supply 1 is the power supply of two-way solenoid valve controller 2, two-way solenoid valve controller 2 keeps opposite operating condition through solenoid valve control line 3 control first solenoid valve 5 and second solenoid valve 6, the input of first solenoid valve 5 and the input of second solenoid valve 6 all link to each other through the first pressure output end that pressurizes pipeline 4 and pressure test platform 15, the output of first solenoid valve 5 and the output of second solenoid valve 6 are connected to two pressure input ends on cylinder 7 respectively, two pressure input ends are located the both sides of the inside piston of cylinder 7 respectively. The diaphragm capsule connecting tool 9 is fixed on the diaphragm capsule limiting tool 8, two ends of the diaphragm capsule connecting tool 9 are respectively connected with the piston in the cylinder 7 and the upper surface of the diaphragm capsule 10, and the diaphragm capsule limiting tool 8 limits the up-and-down reciprocating motion of the diaphragm capsule connecting tool 9 to enable the diaphragm capsule connecting tool to be always kept in the vertical direction. The capsule limiting tool 8, the capsule connecting tool 9 and the capsule 10 are all arranged in a liquid nitrogen tank 11. A second pressure output end of the pressure test bed 15 is connected to the inside of the capsule 10 through a pressure measuring pipeline 12, a manual switch 13 is arranged on the pressure measuring pipeline 12, and a pressure gauge 14 is connected to the pressure measuring pipeline 12 and used for measuring the gas pressure inside the capsule 10. The main function of the pressure test stand 15 is to provide two gases at different pressures.

When the device is actually used, in the first step, helium is filled into the inner cavity of the diaphragm capsule 10 from the low-pressure outlet of the second pressure output end of the pressure test bed 15 through the pressure measuring pipeline 12 for replacement, after replacement is completed, pressure required by a test is filled, the manual switch 13 is closed, and then liquid nitrogen is poured into the liquid nitrogen tank 11. In the second step, the working pressure of the cylinder 7 is charged from the medium pressure outlet of the first pressure output end of the pressure test bed 15 to the pressure inlets of the first solenoid valve 5 and the second solenoid valve 6 through the charging pipeline 4. And thirdly, setting the working state and working time of the two-way electromagnetic valve controller 2, controlling the first electromagnetic valve 5 and the second electromagnetic valve 6 to keep opposite working states, and closing the second electromagnetic valve 6 when the first electromagnetic valve 5 is opened and closing the first electromagnetic valve 5 when the second electromagnetic valve 6 is opened. At the moment, the cylinder 7 moves downwards when the first electromagnetic valve 5 is opened and the second electromagnetic valve 6 is closed, and compresses the diaphragm capsule 10 through the diaphragm capsule connecting tool 9; conversely, when the second solenoid valve 6 is opened and the first solenoid valve 5 is closed, the cylinder 7 moves upward to stretch the capsule 10. Fourthly, the diaphragm capsule 10 can be subjected to low-temperature fatigue examination by setting the working times and the opening and closing time of the two-way electromagnetic valve controller 2, and the pressure change of the inner cavity of the diaphragm capsule 10 during the low-temperature fatigue examination can be observed by the monitoring pressure gauge 14.

Examples

(1) After the diaphragm box limiting tool 8, the diaphragm box connecting tool 9 and the diaphragm box 10 are connected, the diaphragm box limiting tool, the diaphragm box connecting tool and the diaphragm box are placed into a liquid nitrogen tank 11 together;

(2) helium is filled into the inner cavity of the diaphragm capsule 10 through a low-pressure outlet of the pressure test bed 15 for helium replacement; after replacement is finished, helium pressure of 0.075MPa is filled into the inner cavity of the diaphragm capsule 10, the pressure test bed 15 is closed, the pressure in the pressure measuring pipeline 12 is monitored by a pressure gauge 14 for 1 hour, and the test is continued after no pressure drop is determined;

(3) compressed air of 0.5MPa to 0.8MPa is filled into the pressure input ends of the two electromagnetic valves through a medium-pressure outlet of the pressure test bed 15;

(4) connecting a voltage-stabilized power supply 1 and a two-way electromagnetic valve controller 2, and adjusting the opening and closing time of the two electromagnetic valves to 1 time/second; the first electromagnetic valve 5 controls the cylinder to descend (the capsule 10 is compressed), the second electromagnetic valve 6 controls the cylinder to ascend (the capsule 10 is stretched), and the two electromagnetic valves work alternately, so that the compression-stretching process of the capsule 10 is controlled to be 2 seconds each time;

(5) firstly, opening a two-way electromagnetic valve controller 2 to control a switch, enabling an air cylinder 7 to work, and then pouring liquid nitrogen; the sequence of the steps is important and can not be reversed, otherwise, the air in the air cylinder 7 can not work due to low-temperature icing;

(6) after the helium in the diaphragm capsule 10 is completely cooled, the counter of the two-way electromagnetic valve controller 2 is reset to zero, and a fatigue test under a formal liquid nitrogen temperature zone is started;

(7) 15000 times of 'compression-tension' tests are carried out on each piece of the diaphragm capsule 10, and the recording and the inspection of the pressure fluctuation range of the inner cavity of the diaphragm capsule 10 are carried out every 1500 times; when the upper limit value of the pressure fluctuation range of the inner cavity of the diaphragm capsule 10 is lower than 0.02MPa, helium gas is timely supplemented, and then the test is continued.

Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.

Claims

1. The utility model provides a bellows fatigue examination test device under liquid nitrogen warm area which characterized in that includes: the device comprises a voltage-stabilized power supply (1), a two-way electromagnetic valve controller (2), an electromagnetic valve control line (3), a pressurizing pipeline (4), a first electromagnetic valve (5), a second electromagnetic valve (6), a cylinder (7), a diaphragm capsule limiting tool (8), a diaphragm capsule connecting tool (9), a liquid nitrogen tank (11), a pressure measuring pipeline (12), a manual switch (13), a pressure gauge (14) and a pressure test bed (15); the voltage-stabilized power supply (1) supplies power to the two-way electromagnetic valve controller (2), the two-way electromagnetic valve controller (2) controls the first electromagnetic valve (5) and the second electromagnetic valve (6) to keep opposite working states through an electromagnetic valve control line (3), the input end of the first electromagnetic valve (5) and the input end of the second electromagnetic valve (6) are connected with a first pressure output end of a pressure test stand (15) through a pressurizing pipeline (4), the output end of the first electromagnetic valve (5) and the output end of the second electromagnetic valve (6) are respectively connected to two pressure input ends on an air cylinder (7), and the two pressure input ends are respectively positioned on two sides of a piston inside the air cylinder (7); the diaphragm capsule connecting tool (9) is fixed on the diaphragm capsule limiting tool (8), two ends of the diaphragm capsule connecting tool (9) are respectively connected with a piston in the cylinder (7) and the upper surface of the diaphragm capsule (10), and the diaphragm capsule limiting tool (8), the diaphragm capsule connecting tool (9) and the diaphragm capsule (10) are all arranged in a liquid nitrogen tank (11); a second pressure output end of the pressure test stand (15) is connected to the inside of the diaphragm capsule (10) through a pressure measuring pipeline (12), a manual switch (13) is arranged on the pressure measuring pipeline (12), and a pressure gauge (14) is connected to the pressure measuring pipeline (12) and used for measuring the gas pressure inside the diaphragm capsule (10); during the test, helium is filled into the inner cavity of the diaphragm capsule (10) from the second pressure output end of the pressure test bed (15) through the pressure measuring pipeline (12) for replacement, the manual switch (13) is closed after the pressure of the helium in the diaphragm capsule (10) meets the test requirement, then liquid nitrogen is poured into the liquid nitrogen tank (11), the working time of the first electromagnetic valve (5) and the working time of the second electromagnetic valve (6) are set, the gas at the first pressure output end of the pressure test bed (15) acts on the piston in the cylinder (7) through the first electromagnetic valve (5) and the second electromagnetic valve (6) respectively, the piston reciprocates up and down according to the set working time, and the low-temperature fatigue examination is carried out on the diaphragm capsule (10).