Method for calibrating volume of pressurizing gas cylinder for spaceflight

Abstract

The invention discloses a method for calibrating the volume of a pressurized gas cylinder for spaceflight, and the method comprises the following steps: fixing the pressurized gas cylinder to be calibrated through a flange interface of a test blanking cap, and hoisting and reversely placing the pressurized gas cylinder on a supporting tool; the test blanking cap is provided with a filling port and an overflow port, the overflow port is connected with an overflow pipe with scales H1, H2... Hn, and a measuring cup is correspondingly arranged below the overflow pipe; the filling system is connected with the water tank and the filling pipe through pipelines, and the test blanking cap is connected with the filling pipe through a filling port; the overflow pipe is adjusted to the target height H1, and a filling system is started to fill liquid into the pressurizing gas cylinder till the solution overflows from the lower end of the overflow pipe; and recording the sum of the accumulated flow V1 and the volume V10 of the solution overflowing from the measuring cup at the moment, and calculating the volume corresponding to the height. According to the invention, the corresponding volumes of different shapes of pressurizing gas cylinders at different height positions can be simply and quickly measured.

Description

Technical Field

[0001] The present invention belongs to the technical field of equipment manufacturing, and relates to a method for calibrating the volume of a pressurized gas cylinder for aerospace use. Background Art

[0002] During the flight of an aerospace vehicle, the pressurization system of the propellant plays a very important role. At present, the pressurization methods of domestic and foreign aircraft mainly include several methods such as gas cylinder gas storage heating pressurization, liquid storage gasification pressurization, chemical pressurization, and self-pressurization. The pressurized gas usually uses gases such as nitrogen and helium. The pressurized gas is stored in a high-pressure gas cylinder. When the engine works, the gas is led out from the high-pressure gas cylinder and enters the propellant tank for pressurization after passing through the control device. The mass of the pressurization system providing the pressurized gas generally accounts for about 5-10% of the rocket structure mass, and the larger the thrust of the aircraft, the greater the amount of pressurized gas required. Existing technologies mostly focus on structural optimization, pressure detection, or improvement of installation processes, but do not involve accurate calibration of the volumes at different height points of the pressurized gas container.

[0003] In order to accurately control the storage volume of the pressurized gas and improve the carrying capacity of the aircraft, there is an urgent need for a method for accurately calibrating the volumes at different height points of the pressurized gas container. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for calibrating the volume of a pressurized gas cylinder for aerospace use.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A method for calibrating the volume of a pressurized gas cylinder for aerospace use, comprising the following steps:

[0007] S1. Fix the pressurized gas cylinder (2) to be calibrated through the flange interface of the test plug (1), and hoist and invert it on the support tooling (4); the test plug (1) is provided with a filling port and an overflow port, the overflow port is connected to an overflow pipe (5) with scales H1, H2... Hn, and a measuring cup (3) is correspondingly arranged below the overflow pipe (5);

[0008] S2. Connect the filling system (7) to the water tank (8) and the filling pipe (6) respectively through pipelines, and connect the test plug (1) to the filling pipe (6) through the filling port;

[0009] S3. Adjust the overflow pipe (5) to the target height H1, start the filling system (7) to fill the pressurized gas cylinder (2) with liquid until there is solution overflow at the lower end of the overflow pipe (5); record the cumulative flow rate V1 at this time 总 and the volume V10 of the solution overflowing into the measuring cup (3), and calculate the volume corresponding to this height;

[0010] S4. Adjust the overflow pipe (5) to different heights, and repeat step S3 to calibrate the volume corresponding to each height in turn.

[0011] As a preferred method, the pressurization operation of the filling system (7) is achieved by reverse pressurization.

[0012] Further preferably, the support tooling (4) is fixed on the observation table for stabilizing the measurement posture of the pressurized gas cylinder (2).

[0013] As a preferred method, the test plug (1) is threadedly connected to the pressurized gas cylinder (2) and seals the interface of the pressurized gas cylinder (2).

[0014] As a preferred method, the height adjustment of the overflow pipe (5) is achieved by a mechanical or automatic lifting device.

[0015] As a preferred method, the pressurized gas cylinder is a pressurized gas cylinder with a regular shape or an irregular shape.

[0016] The present invention utilizes the principle of reverse pressurization, marks scale values on the overflow pipe, adds water and pressurizes it into the container. When there is solution overflowing from the lower end of the overflow pipe, record the cumulative flow rate, and then through simple calculation, the accurate volume at this position can be obtained.

[0017] The present invention has the following advantages:

[0018] The present invention can achieve simple and rapid measurement of the volumes corresponding to different height positions of pressurized gas cylinders with different shapes, solves the problems that a closed container cannot be directly measured by a sensor and the measurement is difficult and has low accuracy, and improves the convenience of the operation. Description of the Drawings

[0019] Figure 1 is the working principle diagram of the present invention.

[0020] Among them: test plug 1, pressurized gas cylinder 2, measuring cup 3, support tooling 4, overflow pipe 5, filling pipe 6, filling system 7, water tank 8. Detailed Embodiments

[0021] The following will describe the present invention in detail with reference to the drawings.

[0022] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] Embodiment:

[0024] A method for calibrating the volume of a pressurized gas cylinder for aerospace use, including a test plug 1, a pressurized gas cylinder 2, a measuring cup 3, a support tooling 4, an overflow pipe 5, a filling pipe 6, a filling system 7, and a water tank 8;

[0025] The support tooling 4 is placed on a platform; the pressurized gas cylinder 2 is placed upside down on the support tooling 4; the test plug 1 is threadedly connected to the upper flange of the pressurized gas cylinder 2; there are an overflow port and a filling port on the test plug 1; the filling system includes a flow meter with a flow recording function; the water tank 8, the filling system 7, and the filling port of the test plug 1 are connected through the filling pipe 6 for solution filling and flow recording; the overflow port of the test plug 1 is connected to the overflow pipe 5, and height scales are reserved on the overflow pipe for adjusting the measured height position; the measuring cup 3 is placed directly below the overflow pipe 5 to collect and measure the volume of the overflow solution; the applicable structure of the pressurized gas cylinder 2 in this volume calibration scheme is not limited to spherical. After connecting the test plug 1 and the pressurized gas cylinder 2, the whole is hoisted onto the support tooling 4 and fixed; connect the test plug 1, the filling system 7, and the water tank 8; connect the overflow pipe 5 and the test plug 1, and adjust the overflow pipe 5 to the specified measurement height H1 according to the scale; start the filling system 7 and zero it; start filling, and stop filling when it is observed that there is solution overflowing from the lower end of the overflow pipe 5, and record the cumulative flow rate V1 at this time 总 and the volume V10 of the solution overflowing into the measuring cup 3; therefore, the volume V1 corresponding to the height position H1 is V1 = V1 总 - V10; adjust the height H of the overflow pipe, and repeat the above steps to obtain the volumes V2, V3, V4... corresponding to different heights H2, H3, H4...

[0026] The present invention is not limited to the foregoing specific embodiments. The present invention extends to any new feature or any new combination disclosed in this specification, as well as any new method or process step or any new combination disclosed.

Claims

1. A method for calibrating the volume of a pressurized gas cylinder for aerospace use, characterized in that: The steps include: S1. Fix the pressurized gas cylinder (2) to be calibrated through the flange interface of the test plug cover (1), and hoist and place it upside down on the supporting tooling (4); the test plug cover (1) is provided with a filling port and an overflow port, the overflow port is connected to an overflow pipe (5) with scales H1, H2...Hn, and a measuring cup (3) is correspondingly provided below the overflow pipe (5); S2. Connect the filling system (7) to the water tank (8) and the filling pipe (6) through pipelines, and connect the test plug cover (1) to the filling pipe (6) through the filling port; S3. Adjust the overflow pipe (5) to the target height H1, start the filling system (7) to add liquid into the pressurized gas cylinder (2), until the solution overflows from the lower end of the overflow pipe (5); record the accumulated flow rate V1 at this time 总 and the volume V10 of the solution overflowing from the measuring cup (3), and calculate the volume corresponding to the height; S4, adjusting the overflow pipe (5) to different heights, and repeating step S3 to calibrate the volume corresponding to each height in turn.

2. The method for calibrating the volume of a pressurized gas cylinder for aerospace use according to claim 1, characterized in that: The pressurization operation of the filling system (7) is achieved by reverse pressurization.

3. A method for calibrating the volume of a pressurized gas cylinder for aerospace use according to claim 1 or 2, characterized in that: The supporting tool (4) is fixed on the observation platform and is used to stabilize the measurement posture of the pressurized gas cylinder (2).

4. The method for calibrating the volume of a pressurized gas cylinder for aerospace use according to claim 1, characterized in that: The test plugging cover (1) is connected to the pressurized gas cylinder (2) via threads and seals the interface of the pressurized gas cylinder (2).

5. The method for calibrating the volume of a pressurized gas cylinder for aerospace use according to claim 1, characterized in that: The height adjustment of the overflow pipe (5) is achieved through a mechanical or automatic lifting device.

6. A method for calibrating the volume of a pressurized gas cylinder for aerospace use according to claim 1, characterized in that: The pressurized gas cylinder is a pressurized gas cylinder of regular shape or irregular shape.

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