CN114251194A - Propellant filling system and method for metal diaphragm storage tank - Google Patents
Propellant filling system and method for metal diaphragm storage tank Download PDFInfo
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- CN114251194A CN114251194A CN202111384480.2A CN202111384480A CN114251194A CN 114251194 A CN114251194 A CN 114251194A CN 202111384480 A CN202111384480 A CN 202111384480A CN 114251194 A CN114251194 A CN 114251194A
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- filling
- metal diaphragm
- propellant
- storage tank
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/60—Constructional parts; Details not otherwise provided for
- F02K9/605—Reservoirs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to a propellant filling system and method for a metal diaphragm storage tank; the problem that in the prior art, when a storage tank is filled with a propellant, the pressure difference between two sides of a diaphragm is overlarge to cause damage to the diaphragm, and the filling quality and precision are low due to the fact that gas is clamped by a pipeline frequently in the filling process is solved; the invention provides a propellant filling system of a metal diaphragm storage tank, which comprises a vacuum pump, an air cavity filling connector, a liquid cavity filling connector, a filling container, a recovery container and pipelines connected with the filling connector and the liquid cavity filling connector, wherein the gas cavity and the liquid cavity are simultaneously vacuumized through the pipelines on two sides of the storage tank; the invention also provides a method for filling the propellant of the metal diaphragm storage tank, which comprises the steps of simultaneously vacuumizing a gas cavity and a liquid cavity of the storage tank, pre-filling the pipeline and exhausting and discharging the liquid from the pipeline, filling the storage tank, and extruding the propellant in the whole pipeline into a recovery container.
Description
Technical Field
The invention relates to propellant filling of a space liquid engine, in particular to a propellant filling system and method for a metal diaphragm storage tank.
Background
The power for the operation of the liquid attitude and orbit control engine mainly comes from kinetic energy generated by the chemical energy conversion of a propellant stored in a propellant storage unit, the propellant storage unit is usually a storage box, and at present, aiming at different attitude and orbit control engine products, the storage box of main prepackaged products is divided into the following structures: rubber-plastic composite semi-membrane type, surface tension type, metal diaphragm type, differential type, etc.
The metal diaphragm type storage tank is an advanced liquid propellant storage tank at present, the propellant is extruded out of the storage tank by means of the pressure difference between two sides of a diaphragm, a metal diaphragm is a management device of the propellant during the working of the storage tank, the metal diaphragm is used for physically isolating pressurized gas from the propellant, and after a high-pressure gas source is injected into the storage tank, the diaphragm moves to a liquid cavity from a gas cavity and extrudes the propellant stored in the liquid cavity of the storage tank.
The metal diaphragm does not have the high flexibility of rubber materials, and can only realize the adjustment of the flow of the propellant by regular overturning deformation, so the overturning characteristic of the metal diaphragm is very important. The pressure difference between the two sides of the diaphragm of the metal diaphragm storage tank needs to be controlled within a certain range, and if the pressure of the air cavity is higher than that of the liquid cavity and exceeds a certain range, the diaphragm of the storage tank is turned over to the liquid cavity; if the pressure of the liquid cavity is higher than that of the air cavity and exceeds a certain range, the diaphragm of the storage tank is broken to cause the structural damage of the storage tank, the filling process of the metal diaphragm storage tank needs to be ensured to be completed smoothly at one time due to the structural particularity of the metal diaphragm storage tank, if an abnormal problem occurs in the filling process, the propellant needs to be discharged, the storage tank can be refilled or the storage tank in the system needs to be replaced for use after being cleaned, and therefore the production progress of the product is seriously influenced by the filling success rate.
The structural characteristics of the metal diaphragm storage tank, the use safety of the propellant and the characteristic that the liquid attitude and orbit control engine cannot be aerated during working are comprehensively considered, the metal diaphragm storage tank of the liquid attitude and orbit control engine basically adopts a vacuumizing quantitative filling mode to fill the propellant, and if the propellant needs to be discharged once the filling of a product fails, the storage tank needs to be decomposed and cleaned, so that the whole product needs to be decomposed and reloaded to return to a factory, and the production progress is seriously influenced.
In order to ensure smooth assembly of an engine, a metal diaphragm storage tank propellant filling system and a metal diaphragm storage tank propellant filling method are provided.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, due to the structural characteristics of a membrane of a metal membrane storage tank, if the pressure difference of two sides of the membrane exceeds a safe range when a propellant is filled into the metal membrane storage tank, the membrane is damaged, the whole filling system needs to be reconnected and filled, the production progress of a product is reduced, and due to the fact that gas is often clamped by a pipeline in the filling process, the filling quality and precision are low, and provides a propellant filling system and a propellant filling method for the metal membrane storage tank.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a metal diaphragm storage tank propellant filling system is characterized in that: comprises a vacuum pump, an air cavity filling connector, a liquid cavity filling connector, a filling container and a recovery container;
a connecting port of the air cavity filling connector is communicated with a filling and discharging valve at an air port of the metal diaphragm storage tank, and a connecting port of the liquid cavity filling connector is communicated with a filling and discharging valve at a filling port of the metal diaphragm storage tank;
the vacuum pump is communicated with a first interface of the air cavity filling connector through a first pipeline, and is communicated with a first interface of the liquid cavity filling connector through a second pipeline and a third pipeline in sequence;
the filling container is communicated with a first interface of the liquid cavity filling connector through a fourth pipeline, a fifth pipeline and a third pipeline in sequence;
the external blowing equipment is connected to the fifth pipeline through a sixth pipeline;
the recovery container is communicated with a second interface of the liquid cavity filling connector through a seventh pipeline;
and the external pressurizing equipment pressurizes the filling container through an eighth pipeline.
The vacuum degree measuring device measures the vacuum degrees of the gas-liquid two cavities of the metal diaphragm storage box respectively by switching the measuring mode, or measures the vacuum degrees of the gas-liquid two cavities of the metal diaphragm storage box simultaneously by adopting the simultaneous measuring mode.
Furthermore, only one vacuum degree measuring device is needed when the measuring mode is switched, and the vacuum degree measuring device is installed at the intersection of the first pipeline and the second pipeline.
Furthermore, two vacuum degree measuring devices are arranged at the same time in the measuring mode, and are respectively arranged at one end of the first pipeline close to the air cavity filling connector and one end of the second pipeline close to the liquid cavity filling connector.
And the pressure transmitter is arranged at one end of the seventh pipeline close to the second interface of the liquid cavity filling connector and is used for monitoring the pressure applied to the liquid cavity of the metal diaphragm storage tank in real time in the filling process.
Further, the device also comprises an exhaust gas treatment device, wherein the exhaust gas treatment device is communicated with the recovery container through a ninth pipeline, and the exhaust gas treatment device is communicated with the outside atmosphere through a tenth pipeline.
The device further comprises a filling metering device arranged at the bottom of the filling container and a recovery metering device arranged at the bottom of the recovery container, and the filling metering device and the recovery metering device are used for weighing the filling container and the recovery container.
Furthermore, the top ends of the filling container, the recovery container and the waste gas treatment device are communicated with a safety valve and a pressure gauge.
Furthermore, the second pipeline, the third pipeline and the fifth pipeline are communicated through a first three-way pipe, and the fourth pipeline, the sixth pipeline and the fifth pipeline are communicated through a second three-way pipe.
The invention also provides a method for filling the propellant of the metal diaphragm storage tank, which adopts the propellant filling system of the metal diaphragm storage tank as claimed in claim 1, and is characterized by comprising the following steps:
1) vacuumizing a metal diaphragm storage box:
firstly, opening a gas cavity filling and discharging valve by using a gas cavity filling connector, then opening a first pipeline, then opening a liquid cavity filling and discharging valve by using a liquid cavity filling connector, keeping the opening degree of the gas cavity filling and discharging valve and the opening degree of the liquid cavity filling and discharging valve consistent, then opening a second pipeline and a third pipeline, and finally opening a vacuum pump to simultaneously vacuumize a gas-liquid cavity of a metal diaphragm storage tank; after the vacuumizing is finished, closing the liquid cavity filling and discharging valve and the air cavity filling and discharging valve, and simultaneously disconnecting the third pipeline, the second pipeline and the first pipeline;
2) filling a pipeline propellant, filling, exhausting and discharging liquid:
connecting the eighth pipeline with external pressurization equipment, sequentially opening the eighth pipeline, the fourth pipeline, the fifth pipeline and the third pipeline, and injecting the propellant in the filling container into the fourth pipeline, the fifth pipeline and the third pipeline through the pressurization equipment until the propellant cannot be injected continuously under the action of pressure in the pipeline;
then opening a second interface and a seventh pipeline of the liquid cavity filling connector, enabling propellants in the fourth pipeline, the fifth pipeline and the third pipeline to enter a recovery container under the action of a pressurizing device, finishing pipeline pre-filling, closing the seventh pipeline after finishing the pipeline pre-filling, and disconnecting an external pressurizing device;
3) propellant filling:
opening a liquid cavity filling and discharging valve by using a liquid cavity filling connector, gradually filling propellant into the metal diaphragm storage tank for filling due to the fact that the metal diaphragm storage tank is vacuum, and closing the liquid cavity filling and discharging valve by using the liquid cavity filling connector after filling is finished;
4) blowing off a pipeline:
closing the fourth pipeline, connecting the sixth pipeline with external blowing equipment, then opening the sixth pipeline and the seventh pipeline, starting the external blowing equipment to blow the fifth pipeline, the third pipeline and the seventh pipeline in sequence, and after blowing is finished, closing the seventh pipeline, the sixth pipeline, the third pipeline and the fifth pipeline in sequence;
and then, the pipeline system is disassembled, and the filling and discharging valve of the filling port and the air vent of the metal diaphragm storage tank is plugged.
The invention has the beneficial effects that:
1. according to the invention, the air cavity filling connector and the liquid cavity filling connector are connected with the air cavity filling connector and the liquid cavity filling connector through the air-liquid two cavities of the metal diaphragm storage tank, the first pipeline is communicated with the air cavity filling connector, the third pipeline is communicated with the liquid cavity filling connector, the second pipeline is communicated with the third pipeline, then the first pipeline and the second pipeline are both connected to the inlet of the vacuum pump, the air cavity vacuumizing pipeline is opened firstly, then the liquid cavity vacuumizing pipeline is opened, and finally the vacuum pump is opened, so that the air cavity and the liquid cavity of the metal diaphragm storage tank are vacuumized simultaneously, the pressure difference of the air cavity and the liquid cavity is ensured to be in a safe range when the metal diaphragm storage tank is vacuumized, and the diaphragm in the metal diaphragm storage tank is prevented from being damaged due to overlarge pressure difference.
2. The invention realizes the filling of the propellant of the metal diaphragm storage tank through the arranged filling container, the fourth pipeline, the fifth pipeline and the third pipeline, and can open the seventh pipeline by closing the connecting port of the liquid cavity filling connector and the metal diaphragm storage tank to communicate the third pipeline and the seventh pipeline, thereby realizing the filling of the propellant of the pipelines, ensuring that the propellant does not clamp gas when being filled into the metal diaphragm storage tank, and ensuring the filling precision and quality.
3. According to the invention, through the arranged sixth pipeline, after the propellant of the metal diaphragm storage box is filled, the sixth pipeline is connected with the external blowing equipment, and the propellant on the fifth pipeline, the third pipeline and the seventh pipeline can be pushed into the recovery container to be recovered, so that a large amount of propellant does not remain in the pipelines, and the pollution to personnel, products and environment caused by the leakage of the propellant during the system dismantling is avoided.
4. The invention can visually see the pressure difference between the air cavity of the metal diaphragm storage tank and the two sides of the liquid cavity through the arranged vacuum degree measuring device, further ensures that the pressure difference between the air cavity of the metal diaphragm storage tank and the liquid cavity is in a safe range, prevents the storage tank diaphragm from being abnormally overturned because the pressure of the air cavity is higher than that of the liquid cavity, and can visually confirm whether the metal diaphragm storage tank is in place for vacuumizing through the indication value of the vacuum degree measuring device.
5. The pressure transmitter can accurately measure the pressure in the liquid cavity of the metal diaphragm storage tank, further ensures that the pressure difference between the air cavity and the liquid cavity of the metal diaphragm storage tank is in a safe range, and prevents the diaphragm in the metal diaphragm storage tank from being broken due to overlarge pressure difference.
6. According to the invention, through the ninth pipeline, the waste gas treatment device and the tenth pipeline, the steam of the propellant in the recovery container can be treated, and then the treated gas is released into the atmosphere from the tenth pipeline, so that the environmental pollution is reduced, and the safety of workers is ensured.
Drawings
FIG. 1 is a schematic diagram of a metal diaphragm tank propellant filling system of the present invention;
FIG. 2 is a partial system diagram of a metal diaphragm tank propellant filling system of the present invention with a vacuum measurement device;
FIG. 3 is a partial system diagram of a metal diaphragm tank propellant filling system of the present invention with two vacuum level measuring devices.
In the figure, 1-a vacuum pump, 2-an air cavity filling connector, 3-a liquid cavity filling connector, 4-a filling container, 5-a recovery container, 6-a first pipeline, 7-a second pipeline, 8-a third pipeline, 9-a fourth pipeline, 10-a fifth pipeline, 11-a sixth pipeline, 12-a seventh pipeline, 13-an eighth pipeline, 14-a ninth pipeline, 15-a tenth pipeline, 16-a vacuum degree measuring device, 17-a pressure transmitter, 18-an exhaust gas treatment device, 19-a filling metering device and 20-a recovery metering device;
VI-first hand valve, V2-second hand valve, V3-third hand valve, V4-fourth hand valve, V5-fifth hand valve, V6-sixth hand valve, V7-seventh hand valve, A1-first safety valve, A2-second safety valve, A3-third safety valve, S1-first stop valve, S2-second stop valve, S3-third stop valve, S4-fourth stop valve, S5-fifth stop valve, S6-sixth stop valve, S7-seventh stop valve, S8-eighth stop valve, S9-ninth stop valve, F1-first filter, F2-second filter, F3-third filter, P1-first pressure gauge, P2-second pressure gauge, P3-third pressure gauge.
Detailed Description
To further clarify the objects, advantages and features of the present invention, a metal diaphragm tank propellant filling system and method in accordance with the present invention will be described in more detail with reference to the accompanying drawings and detailed description. The advantages and features of the present invention will become more apparent from the following detailed description. It should be noted that: the drawings are in simplified form and are not to precise scale, the intention being solely for the convenience and clarity of illustrating embodiments of the invention; second, the structures shown in the drawings are often part of actual structures.
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a concrete implementation structure of a propellant filling system of a metal diaphragm storage tank, as shown in figure 1, the system comprises a vacuum pump 1, an air cavity filling connector 2, a liquid cavity filling connector 3, a filling container 4, a recovery container 5, filling metering equipment 19 arranged at the bottom of the filling container 4, and recovery metering equipment 20 arranged at the bottom of the recovery container 5;
the vacuum pump 1 is an oil-free dry type scroll vacuum pump with ultimate vacuum lower than 10Pa and capable of being started under atmospheric pressure;
a connecting port of the air cavity filling connector 2 is communicated with a filling and discharging valve of an air vent of the metal diaphragm storage tank, a second interface of the air cavity filling connector 2 is blocked, and a connecting port of the liquid cavity filling connector 3 is communicated with the filling and discharging valve of a filling port of the metal diaphragm storage tank;
the vacuum pump 1 is communicated with a first interface of the air cavity filling connector 2 through a first pipeline 6, and the first pipeline 6 is sequentially provided with a first hand valve V1 and a second hand valve V2 along the direction from the vacuum pump 1 to the metal diaphragm storage tank;
the vacuum pump 1 is communicated with a first connector of the liquid cavity filling connector 3 through a second pipeline 7 and a third pipeline 8 connected with the second pipeline 7 through a first three-way pipe, the second pipeline 7 is connected to the middle position of a first hand valve V1 and a second hand valve V2 on the first pipeline 6, and the second pipeline 7 is provided with a third hand valve V3;
the vacuum degree measuring device 16 measures the vacuum degrees of the gas-liquid two cavities of the metal diaphragm storage tank respectively by switching the measuring modes or simultaneously measures the vacuum degrees of the gas-liquid two cavities of the metal diaphragm storage tank by adopting the simultaneous measuring mode.
As shown in fig. 2, only one vacuum degree measuring device 16 is needed when the measuring mode is switched, and the vacuum degree measuring device 16 is installed at the intersection of the first pipeline 6 and the second pipeline 7;
as shown in fig. 3, two vacuum degree measuring devices 16 are provided in the simultaneous measurement mode, the two vacuum degree measuring devices 16 are respectively disposed at one end of the first pipeline 6 close to the air cavity filling connector 2 and one end of the second pipeline 7 close to the first three-way valve, and the measurement range of the vacuum degree measuring device 16 is 0-105Pa。
The first interface of the filling container 4 and the liquid cavity filling connector 3 is communicated through a fourth pipeline 9 (namely a liquid outlet pipeline of the filling container 4), a fifth pipeline 10 and a third pipeline 8, the fourth pipeline 9 is provided with a first stop valve S1, the fifth pipeline 10 is sequentially provided with a fifth hand valve V5 and a first filter F1 along the medium flow direction, and the third pipeline 8 is sequentially provided with a sixth hand valve V6 and a second filter F2 along the medium flow direction;
a sixth pipeline 11, which forms a blow-off channel with the fifth pipeline 10 and the third pipeline 8, wherein the sixth pipeline 11 is provided with a fourth hand valve V4, and a fourth hand valve V4 is arranged on a tee joint between the first stop valve S1 and the fifth hand valve V5;
the recovery container 5 is communicated with a second interface of the liquid cavity filling connector 3 through a seventh pipeline 12, and the seventh pipeline 12 is sequentially provided with a pressure transmitter 17, a seventh hand valve V7 and a fourth stop valve S4 along the medium flow direction;
the external pressurizing equipment is communicated with the filling container 4 through an eighth pipeline 13, and the eighth pipeline 13 is sequentially provided with a third filter F3 and a third stop valve S3 along the pressurizing equipment towards the filling container 4;
the recovery container 5 is communicated with a waste gas treatment device 18 through a ninth pipeline 14, the ninth pipeline 14 is sequentially provided with a sixth stop valve S6 and a seventh stop valve S7 along the gas flow direction, the waste gas treatment device 18 is communicated with the outside atmosphere through a tenth pipeline 15, and the tenth pipeline 15 is provided with a ninth stop valve S9;
the top ends of the filling container 4, the recovery container 5 and the waste gas treatment device 18 are all communicated with pressure gauges through connecting pipelines, and stop valves are arranged on the three connecting pipelines;
the top ends of the filling container 4, the recovery container 5 and the waste gas treatment device 18 are communicated with safety valves.
The second pipeline 7, the third pipeline 8 and the fifth pipeline 10 are communicated through a first three-way pipe, and the fourth pipeline 9, the sixth pipeline 11 and the fifth pipeline 10 are communicated through a second three-way pipe.
The filling metering device 19 and the recovery metering device 20 can both adopt electronic scales, and can also adopt other metering instruments such as a liquid level meter and the like for products with large filling quantity and low filling precision requirement.
When the filling container 4 is selected, the material of the filling container 4 is compatible with the propellant in the first stage, the bearing pressure of the filling container is not less than the maximum pressure boosted in the filling process, and the volume of the filling container meets the filling requirement.
Based on the description of the system structure and the functions of each component in this embodiment, the process of using the system in this embodiment will now be described:
before use, firstly, the stop valve on the connecting pipeline communicated with the pressure gauge and the ninth stop valve S9 are kept in an open state, and all the other valves are kept in a closed state;
step 1: vacuumizing of metal diaphragm storage box
In order to ensure that the air cavity and the liquid cavity are simultaneously vacuumized, the valve cores of the filling and discharging valves of the air cavity and the liquid cavity are in an open state, and the method for confirming the valve cores of the filling and discharging valves of the air cavity and the liquid cavity is to firstly use the vacuum pump 1 to vacuumize the first pipeline 6, the second pipeline 7 and the third pipeline 8 when the valve cores of the filling and discharging valves of the air cavity and the liquid cavity are in a closed state;
when only one vacuum degree measuring device 16 is provided, in order to ensure the safety of the metal diaphragm storage tank during vacuum pumping, firstly opening the air cavity and then opening the liquid cavity, specifically, opening the air cavity filling and discharging valve by using the air cavity filling connector 2, then opening the second hand valve V2 to communicate the first pipeline 6 with the air cavity of the metal diaphragm storage tank, and at the moment, the numerical value of the vacuum degree measuring device 16 is pressurized to the atmospheric pressure value, namely, the air cavity filling and discharging valve is opened, then opening the liquid cavity filling and discharging valve by using the liquid cavity filling connector 3, wherein the valve core opening degrees of the air cavity filling and liquid cavity filling and discharging valve are consistent, then opening the sixth hand valve V6 and the third hand valve V3, and finally opening the first hand valve V1 to realize the simultaneous vacuum pumping of the air cavity and the liquid cavity;
the optimal number of the vacuum degree measuring devices 16 is two, when the number of the vacuum degree measuring devices 16 is two, the vacuum degrees of the air cavity and the liquid cavity can be respectively observed, the specific operation is that the air cavity filling connector 2 is firstly used for opening the air cavity filling and discharging valve, at the moment, the numerical value of the vacuum degree measuring device 16 connected to the first pipeline 6 is pressurized to the atmospheric pressure value, and the air cavity filling and discharging valve is proved to be opened; then, the liquid cavity filling connector 2 is used for opening the liquid cavity filling and discharging valve, and at the moment, the numerical value of the vacuum degree measuring device 16 connected to the second pipeline 7 is required to be increased to the atmospheric pressure value, namely, the liquid cavity filling and discharging valve is proved to be opened; then the second hand valve V2 is opened, the sixth hand valve V6 and the third hand valve V3 are opened, and finally the first hand valve V1 is opened to realize the simultaneous vacuum pumping of the gas cavity and the liquid cavity;
the vacuum pumping system adopting the two vacuum degree measuring devices 16 can observe the respective vacuum degrees of the gas cavity and the liquid cavity in real time, ensure that the pressure of the gas cavity is lower than that of the liquid cavity, and ensure the safety of the metal diaphragm storage tank;
after the vacuumizing is finished, the liquid cavity filling connector 3 is used for closing the liquid cavity filling discharge valve, and the third pipeline 8 and the second pipeline 7 are closed in sequence; closing the air cavity filling and discharging valve by using the air cavity filling connector 2, sequentially closing a second hand valve V2 and a first hand valve V1 connected to the first pipeline 6, and finally closing the vacuum pump 1, thus finishing the vacuumizing process;
when needing to be noticed: because the vacuum degree measuring device 16 is not installed in the metal diaphragm storage box, in order to ensure the authenticity of the vacuum degree of the metal diaphragm storage box, after the vacuum pumping meets the requirement, the first hand valve V1 is closed, the pressure is maintained for about 3min, after the pressure in the vacuum pumping system and the metal diaphragm storage box is balanced, and the value of the vacuum degree measuring device 16 is stabilized, whether the indication value of the vacuum degree measuring device 16 meets the requirement is observed, and if the indication value does not meet the requirement, the first hand valve V1 can be opened to continue the vacuum pumping until the indication value meets the requirement;
for the metal diaphragm storage tank with the difference value of the liquid cavity pressure and the air cavity pressure being more than or equal to one atmosphere, the liquid cavity can be pumped first and then the liquid cavity is pumped, so as to ensure that the diaphragm does not turn over;
step 2: filling pipeline propellant filling and exhausting liquid discharging
Connecting an external pressurizing device to the eighth pipeline 13, opening the eighth pipeline 13, the fourth pipeline 9, the fifth pipeline 10 and the third pipeline 8 (i.e. opening the third stop valve S3, the first stop valve S1, the fifth hand valve V5 and the sixth hand valve V6), injecting the propellant in the filling container 4 into the fourth pipeline 9, the fifth pipeline 10 and the third pipeline 8 through the pressurizing device, wherein the propellant cannot be continuously injected under the action of the pressure in the pipeline because the medium such as dinitrogen tetroxide is strong and the third pipeline 8, the fourth pipeline 9 or the fifth pipeline 10 cannot be completely filled due to partial propellant gasification during filling, and at the moment, the pipeline exhaust is required, specifically, opening the seventh pipeline 12 (i.e. opening the seventh hand valve V7 and the fourth stop valve S4), exhausting and discharging the propellant from the fourth pipeline 9, the fifth pipeline 10 and the third pipeline 8, and continuing to discharge the propellant, until a certain amount of propellant enters the recovery container 5 (namely the increment of the recovery metering device 20 is 1-1.5 times of the weight of the propellant corresponding to the sum of the volumes of the fourth pipeline 9, the fifth pipeline 10 and the third pipeline 8), ending the pipeline pre-filling, closing the seventh pipeline 12 after ending, and closing the eighth pipeline 13 (namely closing the third stop valve S3 and the seventh hand valve V7) to disconnect the external pressurizing device;
and step 3: propellant filling
Taking the indication value of the filling metering device 19 after exhausting and discharging liquid as an initial value, opening a liquid cavity filling and discharging valve by using a liquid cavity filling connector 3, gradually introducing propellant into a metal diaphragm storage tank for filling due to the fact that the metal diaphragm storage tank is vacuum, closing a sixth hand valve V6 and a liquid cavity filling and discharging valve core after the indication value of the filling metering device 19 reaches a preset target value, and ending filling;
if the propellant is not filled to a certain amount, the filling container 4 needs to be pressurized, the eighth pipeline 13 is connected with external pressurizing equipment, the eighth pipeline 13 is opened (namely, the third stop valve S3 is opened), the filling container 4 is pressurized, the pressurizing pressure is not greater than a required value, and the value of the pressure transmitter 17 is observed in the extrusion filling process; when the sixth hand valve V6 is closed, the pressure transmitter 17 displays the real pressure of the liquid cavity of the metal diaphragm storage tank, so that the pressurization pressure of the filling container 4 can be judged according to the real pressure, and the filling container 4 is continuously pressurized until the filling amount meets the requirement;
if in the filling process, when the difference value between the liquid cavity pressure and the air cavity pressure is in the critical value of the pressure difference at two sides and the liquid cavity pressure is greater than the atmospheric pressure, the air cavity of the metal diaphragm storage box can be broken to be empty, so that the pressure difference between the liquid cavity and the two sides of the air cavity is reduced, then the filling container 4 is continuously pressurized, and the propellant filling is finished under the condition of ensuring the pressure difference between the gas cavity and the liquid cavity;
after filling, the liquid cavity filling connector 3 is used for closing the liquid cavity filling and discharging valve, the eighth pipeline 13 is closed (namely the third stop valve S3 is closed), and the external connection equipment is disconnected;
and 4, step 4: blowing off pipeline
Closing a fourth pipeline 9 of the filling container, connecting an external blowing device to the sixth pipeline 11, then opening the sixth pipeline 11, the seventh pipeline 12 and the ninth pipeline 14 (namely opening a fourth hand valve V4, a seventh hand valve V7, a fourth stop valve S4, a sixth stop valve S6 and a seventh stop valve S7), opening the external blowing device to blow the sixth pipeline 11, the fifth pipeline 10, the third pipeline 8 and the seventh pipeline 12 in a pressurization manner, squeezing propellant in the pipelines into the recovery container 5 until the indication number of the recovery metering device 20 is stable and unchanged, indicating that the pipeline blowing is finished, disconnecting the external blowing device connected with the sixth pipeline 11, and opening the ninth pipeline 14 and the tenth pipeline 15 (namely opening a fifth manual filling stop valve S5 and a seventh manual deflation stop valve S7) to deflate the pipelines until the values of the second pressure gauge P2 and the third pressure gauge P3 are all zero, closing the seventh pipeline 12, the third pipeline 8, the fifth pipeline 10, the sixth pipeline 11 and the ninth pipeline 14 in sequence (namely closing the fourth manual stop valve S4, the seventh hand valve V7, the sixth hand valve V6, the fifth hand valve V5, the sixth hand stop valve S6 and the seventh hand stop valve S7);
and then, the pipeline system is disassembled, and the filling and discharging valve of the filling port and the air vent of the metal diaphragm storage tank is plugged.
Claims (10)
1. A metal diaphragm storage tank propellant filling system which is characterized in that: comprises a vacuum pump (1), an air cavity filling connector (2), a liquid cavity filling connector (3), a filling container (4) and a recovery container (5);
a connecting port of the air cavity filling connector (2) is communicated with a filling and discharging valve at an air port of the metal diaphragm storage tank, and a connecting port of the liquid cavity filling connector (3) is communicated with a filling and discharging valve at a filling port of the metal diaphragm storage tank;
the vacuum pump (1) is communicated with a first interface of the air cavity filling connector (2) through a first pipeline (6), and the vacuum pump (1) is communicated with the first interface of the liquid cavity filling connector (3) through a second pipeline (7) and a third pipeline (8) in sequence;
the filling container (4) is communicated with a first interface of the liquid cavity filling connector (3) through a fourth pipeline (9), a fifth pipeline (10) and a third pipeline (8) in sequence;
the external blowing equipment is connected to the fifth pipeline (10) through a sixth pipeline (11);
the recovery container (5) is communicated with a second interface of the liquid cavity filling connector (3) through a seventh pipeline (12);
and the external pressurizing equipment pressurizes the filling container (4) through an eighth pipeline (13).
2. A metal diaphragm tank propellant filling system as defined in claim 1 wherein: the vacuum degree measuring device (16) is used for measuring the vacuum degrees of the gas-liquid two cavities of the metal diaphragm storage box respectively by switching the measuring mode, or measuring the vacuum degrees of the gas-liquid two cavities of the metal diaphragm storage box simultaneously by adopting the simultaneous measuring mode.
3. A metal diaphragm tank propellant filling system as defined in claim 2 wherein: when the measuring mode is switched, only one vacuum degree measuring device (16) is needed, and the vacuum degree measuring device (16) is arranged at the intersection of the first pipeline (6) and the second pipeline (7).
4. A metal diaphragm tank propellant filling system as defined in claim 2 wherein: and two vacuum degree measuring devices (16) are arranged at the same time in the measuring mode, and the two vacuum degree measuring devices (16) are respectively arranged at one end of the first pipeline (6) close to the air cavity filling connector (2) and one end of the second pipeline (7) close to the liquid cavity filling connector (3).
5. A metal diaphragm tank propellant filling system as defined in claim 1 wherein: the device also comprises a pressure transmitter (17) which is arranged at one end of the seventh pipeline (12) close to the second interface of the liquid cavity filling connector (3) and is used for monitoring the pressure applied to the liquid cavity of the metal diaphragm storage tank in the filling process in real time.
6. A metal diaphragm tank propellant filling system as defined in claim 1 wherein: the device is characterized by further comprising an exhaust gas treatment device (18), wherein the exhaust gas treatment device (18) is communicated with the recovery container (5) through a ninth pipeline (14), and the exhaust gas treatment device (18) is communicated with the outside atmosphere through a tenth pipeline (15).
7. A metal diaphragm tank propellant filling system as defined in claim 1 wherein: the device also comprises a filling metering device (19) arranged at the bottom of the filling container (4) and a recovery metering device (20) arranged at the bottom of the recovery container (5) and used for weighing the filling container (4) and the recovery container (5).
8. The metal diaphragm tank propellant filling system of claim 6, wherein: the top ends of the filling container (4), the recovery container (5) and the waste gas treatment device (18) are communicated with a safety valve and a pressure gauge.
9. A metal diaphragm tank propellant filling system as defined in claim 1 wherein: the second pipeline (7) and the third pipeline (8) are communicated with the fifth pipeline (10) through a first three-way pipe, and the fourth pipeline (9) and the sixth pipeline (11) are communicated with the fifth pipeline (10) through a second three-way pipe.
10. A method for filling a propellant in a metal diaphragm tank, which employs the system for filling a propellant in a metal diaphragm tank as claimed in claim 1, comprising the steps of:
1) vacuumizing a metal diaphragm storage box:
firstly, opening an air cavity filling and discharging valve by using an air cavity filling connector (2), secondly, opening a first pipeline (6), then opening a liquid cavity filling and discharging valve by using a liquid cavity filling connector (3), keeping the opening degrees of the air cavity filling and discharging valve and the liquid cavity filling and discharging valve consistent, then opening a second pipeline (7) and a third pipeline (8), and finally, opening a vacuum pump (1) to simultaneously vacuumize an air-liquid cavity of a metal diaphragm storage tank; after the vacuum pumping is finished, closing the liquid cavity filling and discharging valve and the air cavity filling and discharging valve, and simultaneously disconnecting the third pipeline (8), the second pipeline (7) and the first pipeline (6);
2) filling a pipeline propellant, filling, exhausting and discharging liquid:
connecting the eighth pipeline (13) with external pressurization equipment, opening the eighth pipeline (13), the fourth pipeline (9), the fifth pipeline (10) and the third pipeline (8) in sequence, and injecting the propellant in the filling container (4) into the fourth pipeline (9), the fifth pipeline (10) and the third pipeline (8) through the pressurization equipment until the propellant cannot be injected continuously under the action of pressure in the pipe;
then opening a second interface and a seventh pipeline (12) of the liquid cavity filling connector (3), enabling propellant in the fourth pipeline (9), the fifth pipeline (10) and the third pipeline (8) to enter the recovery container (5) under the action of a pressurizing device, ending the pipeline pre-filling, closing the seventh pipeline (12) after the pipeline pre-filling is ended, and disconnecting the external pressurizing device;
3) propellant filling:
opening a liquid cavity filling and discharging valve by using a liquid cavity filling connector (3), gradually filling propellant into the metal diaphragm storage tank for filling due to the fact that the metal diaphragm storage tank is vacuum, and closing the liquid cavity filling and discharging valve by using the liquid cavity filling connector (3) after filling is finished;
4) blowing off a pipeline:
closing the fourth pipeline (9), connecting the sixth pipeline (11) with external blowing equipment, then opening the sixth pipeline (11) and the seventh pipeline (12), starting the external blowing equipment to blow the fifth pipeline (10), the third pipeline (8) and the seventh pipeline (12) in sequence, and after blowing is finished, closing the seventh pipeline (12), the sixth pipeline (11), the third pipeline (8) and the fifth pipeline (10) in sequence;
and then, the pipeline system is disassembled, and the filling and discharging valve of the filling port and the air vent of the metal diaphragm storage tank is plugged.
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