CN110426252B

CN110426252B - Visual microgravity gas trapping test device

Info

Publication number: CN110426252B
Application number: CN201910605763.1A
Authority: CN
Inventors: 郑红阳; 曹剑峰; 满广龙; 牛春洋; 郑利杰; 夏辉; 程大义
Original assignee: Beijing Institute of Spacecraft System Engineering
Current assignee: Beijing Institute of Spacecraft System Engineering
Priority date: 2019-07-05
Filing date: 2019-07-05
Publication date: 2021-09-24
Anticipated expiration: 2039-07-05
Also published as: CN110426252A

Abstract

The invention discloses a visual microgravity gas trapping test device which comprises a gas trap, a transparent observation tube, a compensator, an expander, a pressure sensor, a disconnector I, a disconnector II and a pump, wherein the gas trap is arranged on the transparent observation tube; the transparent observation tube is connected in series with the upstream of the gas trap, the compensator and the disconnector I are respectively connected in series with the downstream of the gas trap, and the disconnector II is connected in series with the upstream of the transparent observation tube; the pressure sensor, the expander and the pump are connected in series between the disconnector I and the disconnector II, and the pressure sensor is connected in series at the upstream of the pump, so that a closed loop is formed; the testing device also comprises an air sealing device, wherein air is prestored in the air sealing device, and the air pressure is higher than the loop pressure before the pump is started; after the disconnector II is disconnected, the gas sealing device is communicated with the disconnector II, gas enters a loop, and then the gas sealing device is disconnected, and the disconnector II is restored to be connected; the pump was started and the bubbles entered the gas trap through the transparent sight tube. The invention can solve the problem of gas introduction and has simple and reliable operation.

Description

Visual microgravity gas trapping test device

Technical Field

The invention relates to the technical field of gas-liquid separation, in particular to a visual microgravity gas trapping test device.

Background

With the demand and development of on-orbit service, spacecraft require more and more products to be able to be repaired and replaced on-orbit. For the thermal control technology of the fluid circuit, the pipeline equipment generally adopts a modular design, and the module replacement is realized through the disconnection of a fluid circuit disconnector. After many repairs of the piping system inside the capsule, a small amount of gas is introduced into the circuit, plus the gas produced by the long-term slight reaction of the materials in the circuit, thus requiring periodic capture of the gas in the fluid circuit and venting of the circuit.

And gas-liquid separation and entrapment under the microgravity are accomplished by the gas trap, and after the working medium with the bubble flows into the gas trap, because the effect of centrifugal force, liquid flows out the gas trap along tangential direction, and the bubble gathers at the center, and the accessible bleed valve is discharged. In order to ensure the safety and reliability of spacecraft maintenance, the performance of the gas trap needs to be verified.

On the ground, a microgravity environment can be created by using a falling tower and a weightless airplane, an auxiliary test loop is built to introduce gas, a high-speed camera monitoring system is built to observe the bubble motion process, and the weight and size constraints are small. But the microgravity time on the ground is short and the gas bleeding operation cannot be realized. For manned spacecraft, a manned environment and a long-term microgravity environment are provided, and the test of the whole gas trapping process under microgravity can be carried out by combining an on-orbit maintenance technology. There are no bubbles in a normal fluid circuit system, so the difficulty of the gas trapping test is the introduction and trapping of gas.

Disclosure of Invention

In view of this, the invention provides a visual microgravity gas trapping test device, which can solve the problem of gas introduction and is simple and reliable to operate.

The technical scheme adopted by the invention is as follows:

a visual microgravity gas trapping test device comprises a gas trap, a transparent observation tube, a compensator, an expander, a pressure sensor, a disconnector I, a disconnector II and a pump;

the transparent observation tube is connected in series with the upstream of the gas trap, the compensator and the disconnector I are respectively connected in series with the downstream of the gas trap, and the disconnector II is connected in series with the upstream of the transparent observation tube; the pressure sensor, the expander and the pump are connected in series between the disconnector I and the disconnector II, and the pressure sensor is connected in series at the upstream of the pump, so that a closed loop is formed;

the testing device also comprises an air sealing device, wherein air is prestored in the air sealing device, and the air pressure is higher than the loop pressure before the pump is started; after the disconnector II is disconnected, the gas sealing device is communicated with the disconnector II, gas enters a loop, and then the gas sealing device is disconnected, and the disconnector II is restored to be connected; the pump was started and the bubbles entered the gas trap through the transparent sight tube.

Further, the gas sealing device comprises a disconnecting end of the disconnecting and connecting device III and a blocking cap, and the blocking cap seals gas in the disconnecting end of the disconnecting and connecting device III.

Furthermore, the gas trap, the transparent observation tube and the pipeline are all connected in a mode of sleeving nuts on the plunger connector, and the O-shaped ring is sleeved on the plunger connector.

Further, the transparent observation tube is made of Teflon materials.

Further, the testing device also comprises a pressure sensor which is connected in series with the downstream of the pump.

Has the advantages that:

1. the invention utilizes the closed loop test device to simulate the on-orbit maintenance pipeline system of the spacecraft, and utilizes the gas sealing device to solve the problem of gas introduction; and the arranged transparent observation tube does not influence the pressurized sealing of the fluid loop, and can achieve the effect of gas motion visualization. Moreover, the whole testing device is in a modular design, light in weight and convenient to install.

2. The invention adopts the separation end and the plugging cap of the disconnecting and connecting device as the gas sealing device, skillfully utilizes the existing connecting device in the pipeline, realizes the quick connection of the gas sealing device and the pipeline, introduces gas into the pipeline and has simple and reliable operation.

3. The transparent observation tube is made of Teflon material, and has good sealing performance, pressure resistance and no toxicity.

4. The invention is provided with two pressure sensors, on one hand, the loop pressure before the pump is started can be measured, and on the other hand, the running condition of the pump can be monitored by utilizing the differential pressure measured by the two pressure sensors after the pump is started.

Drawings

FIG. 1 is a schematic diagram of the overall piping scheme of the present invention;

FIG. 2 is a three-dimensional schematic of the integrated circuit of the present invention;

FIG. 3 is a schematic view of the disconnect end configuration;

FIG. 4 is a schematic structural view of the fixed end of the disconnector;

FIG. 5 is a schematic view of a gas trap;

FIG. 6 is a schematic view of a transparent viewing tube;

FIG. 7 is a schematic structural view of the air sealing device;

wherein, 1-a disconnector I, 2-a disconnector II, 3-an expander, 4-a pressure sensor I, 5-a pressure sensor II, 6-a pump, 7-a transparent observation tube, 8-a gas trap, 9-a compensator, 10-a deflation valve and 11-a blocking cap.

Detailed Description

The invention is described in detail below by way of example with reference to the accompanying drawings.

The embodiment provides a visual microgravity gas trapping test device, as shown in fig. 1, which comprises a gas trap 8, a transparent observation tube 7, a compensator 9, an expander 3, a pressure sensor I4, a pressure sensor II 5, a disconnector I1, a disconnector II 2 and a pump 6.

The disconnectors are key equipment for realizing the on-off of the fluid loop during on-track maintenance, and as shown in fig. 3 and 4, each disconnector is divided into a fixed end and a separated end, the loops are communicated when the disconnectors are connected, and all the parts are self-sealed after the disconnectors are disconnected. In the embodiment, two disconnectors, namely a disconnector I1 and a disconnector II 2, are adopted for simulating one inlet and one outlet of working media in the in-orbit maintenance process.

The whole device adopts a modular design, as shown in figure 2, a disconnector I1 and a disconnector II 2 are used for realizing disconnection and connection of a loop, and working media are filled through a separation end and a fixed end of the disconnector; the pump 6 is used for providing power for the flow of the working medium; the pressure sensor I4 and the pressure sensor II 5 are used for measuring the loop pressure and monitoring the operating condition of the pump 6; the expander 3 is used for ensuring the pressure safety in the loop after the disconnector II 2 is disconnected; the compensator 9 is used for ensuring the pressure safety in a loop before the disconnecting and connecting device II 2 is disconnected; the transparent observation tube 7 is used for observing the gas conditions before and after trapping; as shown in fig. 5, the gas trap 8 is used for trapping gas and for bleeding gas.

As shown in FIG. 6, the middle of the transparent observation tube 7 is a transparent section, and a Teflon tube is used for observing the operation condition of bubbles in the liquid working medium, so that the pressure resistance requirement of the fluid circuit is met.

The transparent observation tube 7 is connected in series with the upstream of the gas catcher 8, the compensator 9 and the disconnector I1 are respectively connected in series with the downstream of the gas catcher 8, and the disconnector II 2 is connected in series with the upstream of the transparent observation tube 7; the pressure sensor I4, the pressure sensor II 5, the expander 3 and the pump 6 are connected in series between the separation end of the disconnector I1 and the separation end of the disconnector II 2 to form a detachable movable part, and the pressure sensor I4 and the pressure sensor II 5 are respectively connected in series at the upstream and the downstream of the pump 6, so that a closed self-circulation loop is formed.

The gas trap 8, the transparent observation tube 7 and the pipeline are connected in a mode of sleeving nuts on the plunger joint, and the O-shaped ring is sleeved on the plunger joint, so that the sealing performance of the pipeline can be guaranteed.

The introduction of gas into the circuit is accomplished by a gas-seal device comprising a disconnector iii disconnection end and a blanking cap 11, as shown in fig. 7. The inner cavity of the separating end of the disconnector has a certain volume, the fixed end of the disconnector III is connected with the separating end on the ground, the blocking cap 11 seals one end of the separating end of the disconnector III, nitrogen with a certain pressure is pre-filled into the separating end from one end of the fixed end and stored in the separating end, and the pressure is higher than the pressure of a loop before the pump 6 is started.

Before the working medium is filled, the loop is vacuumized, and no visible bubbles exist in the filled loop. The loop pressure was measured using pressure transducer i 4 and pressure transducer ii 5 before pump 6 was started, at which time the two measurements were equal, approximately 130 kPa.

Before the gas trapping test, the pump 6 was started to operate the working medium, and it was confirmed that no gas was present in the circuit through the transparent observation tube 7. The pump 6 is then switched off, disconnecting the fixed and disconnecting ends of the disconnector ii 2. And connecting the separation end of the disconnector III of the gas sealing device with the fixed end of the disconnector II 2. After connection, the gas stored in the gas sealing device enters the loop under the action of pressure difference. And then disconnecting the air sealing device to recover the connection of the disconnector II 2. And restarting the pump 6, enabling bubbles to enter the gas trap 8 through the transparent observation tube 7, and observing the movement condition of the bubbles and the gas trapping effect through the transparent observation tube 7 in the working medium operation process. The collected gas is vented by operating a purge valve 10 on the gas trap 8.

In the test process, the design parameters of the pump 6 are determined according to the flow rate requirement of the gas trap 8 and the flow resistance data of the loop; calculating the required design parameters of the volume and the pressure of the compensator 9 according to the volume of the loop; determining the length of the transparent section in the transparent observation tube 7 according to the circuit layout; and determining the pressure of the pre-filled nitrogen in the gas sealing device according to the requirements of the gas capture test and the loop pressure parameters.

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A visual microgravity gas trapping test device is characterized by comprising a gas trap, a transparent observation tube, a compensator, an expander, a pressure sensor, a disconnector I, a disconnector II and a pump;

the testing device also comprises an air sealing device, wherein air is prestored in the air sealing device, and the air pressure is higher than the loop pressure before the pump is started; after the disconnector II is disconnected, the gas sealing device is communicated with the disconnector II, gas enters a loop, and then the gas sealing device is disconnected, and the disconnector II is restored to be connected; starting a pump, and enabling bubbles to enter a gas trap through a transparent observation tube;

the gas sealing device comprises a disconnecting device III separation end and a blocking cap, and the blocking cap seals gas in the disconnecting device III separation end.

2. The visual microgravity gas capture test device of claim 1, wherein the gas trap, the transparent viewing tube and the pipeline are connected by means of a plunger connector outer sleeve nut, and the O-shaped ring is sleeved on the plunger connector.

3. The visual microgravity gas capture assay device of claim 1 wherein the transparent sight tube is of teflon material.

4. The visual microgravity gas capture assay device of claim 1 further comprising a pressure sensor in series downstream of the pump.