CN110562502A - Device and method for discharging redundant gas suitable for liquid nitrogen supply pipeline - Google Patents
Device and method for discharging redundant gas suitable for liquid nitrogen supply pipeline Download PDFInfo
- Publication number
- CN110562502A CN110562502A CN201910759308.7A CN201910759308A CN110562502A CN 110562502 A CN110562502 A CN 110562502A CN 201910759308 A CN201910759308 A CN 201910759308A CN 110562502 A CN110562502 A CN 110562502A
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- gas
- liquid nitrogen
- nitrogen supply
- buffer container
- control instrument
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G7/00—Simulating cosmonautic conditions, e.g. for conditioning crews
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/008—Subject matter not provided for in other groups of this subclass by doing functionality tests
Abstract
The invention provides a device and a method for discharging redundant gas suitable for a liquid nitrogen supply pipeline, which comprise the following steps: the gas collecting cavity comprises a gas collecting cavity (2), a detection device, a control instrument (4) and a gas discharging device, wherein one end of the gas collecting cavity (2) is connected with a liquid nitrogen supply pipeline (1), the other end of the gas collecting cavity (2) is connected with the gas discharging device, the detection device is arranged in the gas collecting cavity (2), the detection device is connected with the control instrument (4), and the control instrument (4) is connected with the gas discharging device. The device has simple and reasonable structure and convenient operation, avoids extra liquid nitrogen discharge caused by the traditional gas-liquid separation device when discharging the extra gas, thereby greatly reducing the influence on the surrounding environment, stabilizing the pressure in the supply pipeline, realizing the effective discharge of the extra gas in the long-distance liquid nitrogen supply pipeline, and effectively reducing the influence of temperature fluctuation and the like caused by the extra gas entering the liquid nitrogen device.
Description
Technical Field
The invention relates to a spacecraft ground test, in particular to a surplus gas discharging device suitable for a liquid nitrogen supply pipeline, and particularly relates to a surplus gas discharging device suitable for a long-distance liquid nitrogen supply pipeline.
Background
the spacecraft is in a space environment and faces a cosmic cold black background, and the cold black background is equivalent to a black body of 3K-4K. Before the spacecraft is launched to the sky environment, a large number of tests for simulating the space environment are needed to be carried out on the ground, and liquid nitrogen is used as a cooling medium for temperature simulation. However, a large number of devices such as a gaseous nitrogen temperature adjusting device, a liquid nitrogen cold plate, and the like have intermittent characteristics when using liquid nitrogen, and once nitrogen enters, temperature fluctuation is caused when using liquid nitrogen. In the use process of a long-distance liquid nitrogen pipeline and a liquid nitrogen Dewar, although the liquid nitrogen Dewar is provided with a heat insulation material, gas can be formed in the pipeline due to heat leakage of the heat insulation material, when a device using the liquid nitrogen does not need the liquid nitrogen temporarily, the generated gas can be accumulated in the pipeline, once the device using the liquid nitrogen needs the liquid nitrogen to supply, gas nitrogen enters firstly, the temperature of the gas nitrogen is high, the heat capacity is small, and temperature fluctuation can be caused after the gas nitrogen enters the device. In addition, since the liquid nitrogen expands in volume after being gasified and accumulates inside the pipeline, the pressure inside the pipeline rises, and the excessive pressure causes pressure fluctuation inside the liquid nitrogen using device. In order to avoid the phenomenon, the cost is greatly increased by generally increasing the heat preservation effect of the pipeline and reducing the gasification of liquid nitrogen in the pipeline in China, but the problem is difficult to completely avoid.
Patent document CN103388744A discloses a liquid nitrogen delivery device for delivering liquid nitrogen from a liquid nitrogen container, which includes: a liquid nitrogen pump; the air source is used for providing compressed air for the liquid nitrogen pump to drive the liquid nitrogen pump to work; and the controller is used for controlling the duration and the interval time of the compressed air entering and exiting the liquid nitrogen pump. The liquid nitrogen pump in the liquid nitrogen conveying device provided by the invention realizes parameter input through the controller and then is controlled through a program, and the air source provides compressed air for driving, so that the liquid nitrogen pump can automatically run in a timing and quantitative mode, manual full-process participation is not needed, the intelligent degree is higher, the manual work is saved, the cost is reduced, and the conveying efficiency of liquid nitrogen is obviously improved. However, it is difficult to avoid the gasification of liquid nitrogen to generate nitrogen gas during the transportation process, and the generation of gaseous nitrogen affects the pressure and temperature of the pipeline, and finally affects the pressure and temperature fluctuation inside the liquid nitrogen using device.
Disclosure of Invention
In view of the shortcomings of the prior art, it is an object of the present invention to provide an apparatus and method for venting excess gas for long distance liquid nitrogen supply lines.
according to the present invention, there is provided an excess gas discharge device suitable for a liquid nitrogen supply line, comprising: the gas collecting cavity comprises a gas collecting cavity (2), a detection device, a control instrument (4) and a gas discharging device, wherein one end of the gas collecting cavity (2) is connected with a liquid nitrogen supply pipeline (1), the other end of the gas collecting cavity (2) is connected with the gas discharging device, the detection device is arranged in the gas collecting cavity (2), the detection device is connected with the control instrument (4), and the control instrument (4) is connected with the gas discharging device.
Preferably, the detection means comprises any one or more of the following sensors:
-a temperature sensor (3);
-a liquid level sensor;
-a pressure sensor (8).
preferably, the control instrument (4) controls the gas discharge device to discharge the gas according to a detection signal of the detection device.
Preferably, the gas discharge device comprises a control valve (5) and a gas discharge pipeline (9), wherein the control valve (5) is arranged on the gas discharge pipeline (9), the control valve (5) is connected with a control instrument (4), and the gas discharge pipeline (9) is connected with the gas collection cavity (2).
Preferably, the device further comprises a buffer container (6), wherein the buffer container (6) is arranged on the liquid nitrogen supply pipeline (1), and the buffer container (6) is connected with the gas collecting cavity (2).
preferably, the detection means are arranged in the gas collection chamber (2) and/or the buffer container (6).
Preferably, the buffer container (6) is arranged on the liquid nitrogen supply pipeline (1) between the liquid nitrogen supply device and the liquid nitrogen using device; a liquid inlet valve (7) of the buffer container is arranged on the liquid nitrogen supply pipeline (1) at one side of the buffer container connected with the liquid nitrogen supply device, and the liquid inlet valve (7) of the buffer container is connected with the control instrument (4).
Preferably, the gas discharge line (9) is integrally formed with the gas collection chamber (2) or is connected in a mating manner by a connecting piece.
Preferably, the detection device and the control instrument (4) are remotely connected with an external control device.
the invention provides a method for discharging redundant gas suitable for a liquid nitrogen supply pipeline, which comprises the following steps:
Step 1: the detection device detects the gas state in the gas collection cavity (2) and/or the buffer container (6) in real time and transmits a detection signal to the control instrument (4);
Step 2: the control instrument (4) judges whether the gas state in the gas collecting cavity (2) and/or the buffer container (6) reaches a preset upper limit value or not according to the detection signal; if the gas state does not reach the preset upper limit value, the detection device is instructed to continue to detect the gas state in the gas collection cavity (2) and/or the buffer container (6); if the preset upper limit value is reached, executing the step 3;
and step 3: the control instrument (4) commands the control valve (5) to open, and the gas discharge pipeline (9) discharges redundant gas;
and 4, step 4: repeating the step 1;
And 5: the control instrument (4) judges whether the gas state in the gas collecting cavity (2) and/or the buffer container (6) reaches a preset lower limit value or not according to the detection signal; if the preset lower limit value is reached, the control valve (5) is commanded to close, and the gas emission is stopped.
compared with the prior art, the invention has the following beneficial effects:
1. The device has simple and reasonable structure and convenient operation, avoids extra liquid nitrogen discharge caused by the traditional gas-liquid separation device when discharging the extra gas, thereby greatly reducing the influence on the surrounding environment, stabilizing the pressure in the supply pipeline, realizing the effective discharge of the extra gas in the long-distance liquid nitrogen supply pipeline, and effectively reducing the influence of temperature fluctuation and the like caused by the extra gas entering the liquid nitrogen device.
2. the device of the invention has electrical elements capable of receiving remote measurement and control, and can be effectively combined with a control system to realize more complex control.
3. The device is suitable for intermittent long-distance transportation of other low-temperature liquefied gases after being modified on the basis of being suitable for a liquid nitrogen system.
4. The invention avoids the waste of liquid nitrogen caused by the traditional method, effectively reduces the discharge of the liquid nitrogen and reduces the influence on the surrounding environment.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic view showing a connection structure of one embodiment of the present invention with a device using liquid nitrogen.
FIG. 3 is a schematic view showing a connection structure of another embodiment of the present invention with a device using liquid nitrogen.
the figures show that:
0-heat insulation material 5-control valve wrapped outside liquid nitrogen supply pipeline
1-liquid nitrogen supply pipeline 6-buffer container
2-gas collection cavity 7-buffer container liquid inlet valve
3-temperature sensor 8-pressure sensor
4-control instrument 9-gas discharge line
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the 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 application.
The invention provides a device and a method for discharging redundant gas suitable for a liquid nitrogen supply pipeline, which comprise the following steps: liquid level detection device, drain. Wherein, liquid level detection device is used for detecting whether gaseous collecting space has been filled up, and discharging equipment discharges unnecessary gas according to the testing result. When the invention discharges the redundant gas, the extra liquid nitrogen discharge caused by the traditional gas-liquid separation device is avoided, thereby greatly reducing the influence on the surrounding environment and having good effect; the liquid nitrogen discharging device is simple in structure and convenient to operate, can realize effective discharge of redundant gas of a long-distance liquid nitrogen supply pipeline, and effectively reduces the influence of temperature fluctuation and the like caused by the fact that the redundant gas enters the liquid nitrogen device.
according to the present invention, there is provided an excess gas discharging apparatus for a liquid nitrogen supply line, as shown in fig. 1 to 3, comprising: gaseous collection chamber 2, detection device, control instrument 4, gas discharge device, liquid nitrogen supply line 1 is connected to 2 one ends in gaseous collection chamber, and gas discharge device is connected to the other end in gaseous collection chamber 2, is provided with detection device in the gaseous collection chamber 2, and detection device connection control instrument 4, control instrument 4 connect gas discharge device, detection device includes following any kind or arbitrary multiple sensor: the device comprises a temperature sensor 3, a liquid level sensor and a pressure sensor 8, wherein the control instrument 4 controls a gas discharge device to discharge gas according to a detection signal of a detection device, the gas discharge device comprises a control valve 5 and a gas discharge pipeline 9, the control valve 5 is arranged on the gas discharge pipeline 9, the control valve 5 is connected with the control instrument 4, the gas discharge pipeline 9 is connected with a gas collection cavity 2, the device also comprises a buffer container 6, the buffer container 6 is arranged on a liquid nitrogen supply pipeline 1, the buffer container 6 is connected with the gas collection cavity 2, the detection device is arranged in the gas collection cavity 2 and/or the buffer container 6, and the buffer container 6 is arranged on the liquid nitrogen supply pipeline 1 between the liquid nitrogen supply device and a liquid nitrogen using device; the liquid nitrogen supply pipeline 1 on one side that buffer vessel and liquid nitrogen supply device are connected is provided with buffer vessel feed liquor valve 7, and buffer vessel feed liquor valve 7 connection control instrument 4, gas emission pipeline 9 and gas collection chamber 2 integrated into one piece or through connecting piece accordant connection, through the introduction in gas collection chamber, reduce the loss of traditional gas-liquid separation device to the liquid nitrogen, through the introduction in gas collection chamber when carrying out unnecessary gas emission, make the liquid nitrogen that discharges out significantly reduce, therefore the influence to the surrounding environment that significantly reduces, detection device, control instrument 4 remote connection external control device can be with the control system of signal of telecommunication introduction equipment, can feed back operating condition effectively to accept remote control, realize more complicated control.
The invention provides a method for discharging redundant gas suitable for a liquid nitrogen supply pipeline, which comprises the following steps:
step 1: the detection device detects the gas state in the gas collection cavity 2 and/or the buffer container 6 in real time and transmits a detection signal to the control instrument 4;
Step 2: the control instrument 4 judges whether the gas state in the gas collecting cavity 2 and/or the buffer container 6 reaches a preset upper limit value or not according to the detection signal; if the gas state does not reach the preset upper limit value, the detection device is instructed to continue to detect the gas state in the gas collection cavity 2 and/or the buffer container 6; if the preset upper limit value is reached, executing the step 3;
And step 3: the control instrument 4 commands the control valve 5 to open, and the gas discharge pipeline 9 discharges redundant gas;
And 4, step 4: repeating the step 1;
and 5: the control instrument 4 judges whether the gas state in the gas collecting cavity 2 and/or the buffer container 6 reaches a preset lower limit value or not according to the detection signal; if the preset lower limit value is reached, the control valve 5 is commanded to close, and the gas emission is stopped.
the detection device is used for controlling the gas discharge device to discharge redundant gas, and the detection device and the gas discharge device are used in a combined manner; the method utilizes the detection device to carry out logic judgment on the temperature information to realize the automatic control of the gas discharge device to discharge the redundant gas.
Example 1
in a specific embodiment, the invention provides a surplus gas discharge device for a liquid nitrogen supply pipeline, as shown in figure 2, and a gas collection chamber is connected with the liquid nitrogen supply pipeline and is arranged at a position close to a liquid nitrogen using device. To achieve a better result, this section of the liquid nitrogen supply line can be kept at a certain inclination, slightly elevated at the end close to the liquid nitrogen usage device and the excess gas discharge device, so as to concentrate the nitrogen gas vaporized in the pipe in the gas collection chamber. When the gas in the gas collecting cavity reaches a certain amount, the liquid level in the gas collecting cavity is lower than the position of the temperature sensor 3, the temperature of the temperature sensor 3 rises, after a signal is fed back to the control instrument, the control instrument controls the signal provided for the control valve 5 according to preset logic, so that the control valve 5 is opened, and redundant gas is released. When the release of the redundant gas is nearly finished, the liquid level in the gas collecting cavity rises, so that the signal of the temperature sensor changes, and after the signal is received by the control instrument, the signal of the control valve 5 is changed according to a preset logic algorithm, so that the control valve 5 is closed.
the invention provides a method for discharging redundant gas of a liquid nitrogen supply pipeline, which comprises the following steps:
Step 1: after the excess gas is generated in the liquid nitrogen supply line 1 and reaches a predetermined value, the temperature in the gas collection chamber 2 rises and is detected by the temperature sensor;
Step 2: the temperature sensor 3 transmits a temperature signal to the control instrument;
And step 3: the control instrument 4 judges according to the control logic, and transmits a control signal to the control valve 5 after confirming the temperature rise;
and 4, step 4: the control valve 5 is opened after receiving the signal, and redundant gas is discharged;
And 5: after the excessive gas is discharged, the liquid nitrogen in the gas collecting cavity rises, so that the temperature in the gas collecting cavity is lower than a preset value, and the temperature of the temperature sensor falls.
example 2
In a more specific embodiment, the use of the excess gas discharge device provided by the present invention in combination with the buffer container 6, the buffer container inlet valve 7 and the pressure sensor 8, also allows to effectively control the pressure of the liquid nitrogen supply, as shown in fig. 3, preferably, the buffer container 6 is a buffer dewar. The introduction of the buffer vessel 6 is effective to ensure a more efficient and timely supply of liquid nitrogen, and in addition, the upper part of the buffer vessel 6 is suitably kept partially gaseous for more precise regulation of the pressure inside the buffer vessel.
With the temperature sensor 3 placed at an appropriate position of the buffer container, when the liquid level is reached and through a more complicated control logic, not only can the effective discharge of the surplus gas be controlled, but also, in conjunction with the use of the pressure sensor 8, the opening degree of the control valve 5 can be adjusted more accurately, ensuring that a more stable pressure supply can be achieved. When the liquid level is lower than the expected position, the temperature sensor signal is transmitted to the control instrument 4 to open the liquid inlet valve 7 of the buffer container, so that the liquid level of the buffer container is adjusted to the expected position. When the pressure of the buffer vessel is higher than the preset value, the control valve 5 is opened to reduce the pressure of the buffer vessel to the preset value.
By using the surplus gas discharge device of the long-distance liquid nitrogen supply pipeline, the surplus gas can be effectively discharged in time, and the liquid nitrogen using device can obtain stably supplied liquid nitrogen at any time. Furthermore, in combination with the use of a pressure sensor and a buffer vessel, a more complex control can be achieved.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. An excess gas discharge device suitable for use in a liquid nitrogen supply line, comprising: the gas collecting cavity comprises a gas collecting cavity (2), a detection device, a control instrument (4) and a gas discharging device, wherein one end of the gas collecting cavity (2) is connected with a liquid nitrogen supply pipeline (1), the other end of the gas collecting cavity (2) is connected with the gas discharging device, the detection device is arranged in the gas collecting cavity (2), the detection device is connected with the control instrument (4), and the control instrument (4) is connected with the gas discharging device.
2. The excess gas discharge device suitable for use in a liquid nitrogen supply line according to claim 1, wherein the detection means comprises any one or more of the following sensors:
-a temperature sensor (3);
-a liquid level sensor;
-a pressure sensor (8).
3. The surplus gas discharge apparatus suitable for use in a liquid nitrogen supply line according to claim 1, wherein the control instrument (4) controls the gas discharge apparatus to discharge the gas in accordance with a detection signal of the detection means.
4. the excess gas discharge device for liquid nitrogen supply line according to claim 1, characterized in that the gas discharge device comprises a control valve (5), a gas discharge line (9), the control valve (5) is arranged on the gas discharge line (9), the control valve (5) is connected with a control instrument (4), and the gas discharge line (9) is connected with the gas collection chamber (2).
5. The excess gas discharge device suitable for the liquid nitrogen supply line according to claim 1, further comprising a buffer container (6), wherein the buffer container (6) is arranged on the liquid nitrogen supply line (1), and the buffer container (6) is connected with the gas collection chamber (2).
6. The excess gas discharge device for liquid nitrogen supply line according to claim 5, characterized in that the detection means are arranged in the gas collection chamber (2) and/or the buffer container (6).
7. The surplus gas discharge apparatus suitable for a liquid nitrogen supply line according to claim 5, wherein the buffer container (6) is provided on the liquid nitrogen supply line (1) between the liquid nitrogen supply means and the liquid nitrogen using means; a liquid inlet valve (7) of the buffer container is arranged on the liquid nitrogen supply pipeline (1) at one side of the buffer container connected with the liquid nitrogen supply device, and the liquid inlet valve (7) of the buffer container is connected with the control instrument (4).
8. the excess gas drain device for liquid nitrogen supply line according to claim 4, characterized in that the gas drain line (9) is formed integrally with the gas collection chamber (2) or is connected by a connector fitting.
9. The excess gas discharge device for liquid nitrogen supply line according to claim 1, wherein the detection device, the control instrument (4) is remotely connected with an external control device.
10. A method for discharging surplus gas suitable for a liquid nitrogen supply pipeline is characterized by comprising the following steps:
Step 1: the detection device detects the gas state in the gas collection cavity (2) and/or the buffer container (6) in real time and transmits a detection signal to the control instrument (4);
step 2: the control instrument (4) judges whether the gas state in the gas collecting cavity (2) and/or the buffer container (6) reaches a preset upper limit value or not according to the detection signal; if the gas state does not reach the preset upper limit value, the detection device is instructed to continue to detect the gas state in the gas collection cavity (2) and/or the buffer container (6); if the preset upper limit value is reached, executing the step 3;
and step 3: the control instrument (4) commands the control valve (5) to open, and the gas discharge pipeline (9) discharges redundant gas;
And 4, step 4: repeating the step 1;
And 5: the control instrument (4) judges whether the gas state in the gas collecting cavity (2) and/or the buffer container (6) reaches a preset lower limit value or not according to the detection signal; if the preset lower limit value is reached, the control valve (5) is commanded to close, and the gas emission is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910759308.7A CN110562502A (en) | 2019-08-16 | 2019-08-16 | Device and method for discharging redundant gas suitable for liquid nitrogen supply pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910759308.7A CN110562502A (en) | 2019-08-16 | 2019-08-16 | Device and method for discharging redundant gas suitable for liquid nitrogen supply pipeline |
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| CN110562502A true CN110562502A (en) | 2019-12-13 |
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Application publication date: 20191213 |