CN113135304B - Fluid circuit filling method for calculating return displacement of liquid reservoir - Google Patents
Fluid circuit filling method for calculating return displacement of liquid reservoir Download PDFInfo
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Abstract
The invention provides a fluid circuit filling method for calculating the return displacement of a liquid accumulator, which comprises a liquid accumulator return displacement calculation step and a flowA body loop return discharge type filling step, a liquid storage device return discharge capacity calculating step: inquiring to obtain different filling temperatures T of the working medium r Lower density ρ r Calculating to obtain the return displacement m' of the liquid accumulator and the filling pressure P at the air side of the liquid accumulator by a liquid accumulator return displacement calculation method according to the maximum filling amount m of the system; a fluid circuit back-discharge type filling step: and filling the fluid circuit according to the reservoir return displacement m' and the reservoir air side filling pressure P calculated in the reservoir return displacement calculation step by a fluid circuit return displacement type filling method. The invention does not need to equip the liquid level indicating functional component on the liquid storage device or the fluid loop system, does not need to specify the production structure of the liquid storage device, and the drain-back calculation system is fully combined with the boundary constraint condition, scientifically combined with the filling process, and has simple operation.
Description
Technical Field
The invention relates to the field of thermal control of spacecrafts, in particular to a fluid circuit filling method for calculating the return displacement of a liquid storage device.
Background
The fluid loop system is an important mode in the active thermal control technology of the spacecraft, the fluid loop system utilizes a mechanical pump to drive liquid to carry out forced convection circulation to control the heat of the spacecraft, and the fluid loop system is widely applied to numerous spacecrafts at home and abroad due to the characteristics of good heat exchange effect, safety, reliability and the like. The liquid storage device is a component of the fluid loop, compensates volume change of working media of the fluid loop caused by expansion with heat and contraction with cold and leakage, ensures that the back pressure of the fluid loop always meets the requirement, reduces the risk of shortening the service life of the driving pump due to cavitation erosion, and simultaneously avoids the bursting of hydraulic-resistant components such as pipelines, radiators and the like due to overhigh hydraulic pressure.
The existing fluid circuit filling concept has the following defects: 1. because of the requirements of reliability and weight reduction, the liquid reservoir does not have the function of indicating the liquid level, so that the liquid level cannot be accurately judged during ground filling, and the filling amount of the fluid loop is not accurate enough; 2. because the task side emphasis of the fluid loop system is different, the number of the main and standby loops and the selection of components on the loops are uncertain, and the reservoir and other components of the fluid loop are in a state of collaborative design and development, so that the volume of a cavity in the fluid loop cannot be accurately measured, and the minimum design liquid filling amount and the minimum design gas filling amount of the reservoir cannot be accurately calculated; 3. the reservoir often can not be produced according to minimum design liquid side volume and gas side volume because the subassembly case is twined size limitation and the demand of batch production back producer type spectral product processing, leads to original theoretical filling volume and actual deviation great.
The patent with the application number of CN104504176A discloses a method for matching the liquid storage device and the working medium filling amount in a gravity-driven two-phase fluid loop. The method comprises the steps of firstly calculating the volume and the filling amount of the liquid storage device based on the conditions of highest working temperature and lowest working temperature, then checking the reasonability of the calculation result in the step 1 based on the high-temperature storage condition, then iteratively solving the clear space size of the liquid storage device based on the constraint condition, and finally calculating the wall thickness of the liquid storage device based on the material yield and the bursting property, thereby finally obtaining the structural size and the working medium filling amount of the liquid storage device which meet the operation requirement, the installation requirement and the severe environment requirement of a fluid loop. The invention aims to provide a two-phase fluid circuit, which has larger difference with the single-phase fluid circuit in modeling mechanism and physical structure. And the former provides a two-phase flow reservoir design process, while the present patent provides a charge calculation based on either single-phase reservoir.
Patent application No. CN101025175A discloses a method and apparatus for filling a hydraulic circuit with a control fluid, creating a vacuum within the hydraulic circuit, supplying the control fluid to a degassing chamber, creating a vacuum within a degassing chamber containing the control fluid and supplying the control fluid under pressure from the degassing chamber to the hydraulic circuit while continuously maintaining the vacuum within the hydraulic circuit. The present invention is applied to the filling operation of the hydraulic circuit of the actuating device of the servo-assisted vehicle gear lever, which is very different from the filling method of the reservoir-based space fluid circuit system described in the present patent, and both have a great difference in the filling principle and model calculation.
Disclosure of Invention
The invention aims to provide a general filling method of a fluid circuit, which can accurately calculate the return displacement of a liquid storage device and aims to overcome the defects that the design filling amount of the liquid storage device of the fluid circuit in the prior art is greatly different from the filling amount required by actual ground test and on-orbit operation, so that the compensation function of the liquid storage device cannot meet the index and the active temperature control capability of a spacecraft is limited.
The fluid circuit filling method for calculating the back displacement of the reservoir comprises a reservoir back displacement calculating step and a fluid circuit back displacement filling step,
calculating the return displacement of the reservoir: inquiring to obtain the filling temperature T of the working medium at different filling temperatures r Lower density ρ r Calculating to obtain the return displacement m' of the liquid accumulator and the filling pressure P at the air side of the liquid accumulator by a liquid accumulator return displacement calculation method according to the maximum filling amount m of the system;
a fluid circuit back-discharge type filling step: and filling the fluid circuit according to the reservoir return displacement m' and the reservoir air side filling pressure P calculated in the reservoir return displacement calculation step by a fluid circuit return displacement type filling method.
Preferably, the reservoir back-displacement calculating step includes the steps of:
step 1: the internal volume of the reservoir is extracted in a Spaceclaim environment to obtain the gas side volume V of the reservoir when the corrugated pipe is in a free state g And the air side volume DeltaV of the reservoir when the bellows is in the limit position of the upper cover 0 ；
Step 2: based on working substancesCharacteristic query of charging temperature T r Density of lower working medium rho r For a specific working medium, the coefficient of expansion β of the working medium can also be calculated, wherein the coefficient of expansion β of the working medium is defined as:
wherein, v is the specific volume of the working medium, and is defined as the reciprocal of the density, i.e. v is 1/rho, and the unit is m 3 /kg；
And step 3: working medium density rho under rail high-temperature working condition temperature Tmax based on working medium characteristic query h ；
And 4, step 4: calculating the return displacement m' of the reservoir:
and 5: the volume expansion amount delta V of the reservoir bellows from the ground filling temperature to the free state is calculated according to the following formula 1 ：
Step 6: calculating the filling pressure P on the gas side of the liquid storage device:
wherein, P max The gas side of the maximum reservoir is filled with pressure.
Preferably, the method for calculating the return displacement of the liquid accumulator is compiled into windowing software, and the filling temperature T is input r And the maximum filling amount m of the system, and the return displacement m' of the liquid accumulator and the gas side filling pressure P of the liquid accumulator are obtained.
Preferably, the method for calculating the return displacement of the reservoir is programmed into a fluid circuit filling parameter lookup table, and the filling temperature T is queried r And systemAnd obtaining the maximum filling amount m, and obtaining the return displacement m' of the liquid accumulator and the gas side filling pressure P of the liquid accumulator.
Preferably, the precision of the maximum filling quantity m of the system is 0.1kg, the precision of the return discharge quantity m' of the liquid storage device is 1mg, and the precision of the filling pressure P on the air side of the liquid storage device is 1kPa according to the fluid circuit filling parameter lookup table.
Preferably, the fluid circuit back-drain type filling method comprises the following steps:
step a: the filling system is installed and debugged, and comprises a filling box, a mass flow meter, a vacuum pump, a pressure gauge, a valve and a liquid observing device;
step b: filling the filling tank to enable the working medium in the filling tank to reach the designated liquid level;
step c: vacuumizing the gas side of the filling box to finish degassing of the working medium;
step d: measuring the temperature of the working medium after standing, i.e. the filling temperature T r ；
Step e: vacuumizing the air side of the liquid reservoir and the liquid side of the fluid loop;
step f: filling a working medium at the liquid side of the fluid loop, controlling the filling rate of the working medium in the filling process, and counting the total mass of the filled working medium according to the flowmeter to obtain the maximum filling quantity m of the system;
step g: by filling temperature T r Obtaining the return displacement m' of the liquid accumulator and the gas side filling pressure P of the liquid accumulator according to the maximum filling amount m of the system;
step h: the liquid side of the fluid loop is drained back, and the back drainage speed of the working medium is controlled until the back drainage volume of the liquid reaches a target value m';
step i: supplementing gas to the gas side of the liquid storage device, adjusting a gas distribution table at the gas side of the loop, continuously filling nitrogen to the gas side of the loop for pressurization, and pressurizing to a target pressure P;
step j: and (5) the filling system is disassembled, and the fluid loop filling is completed.
Preferably, in the step f, the pressure difference on the gas-liquid side of the reservoir is not more than 0.1Mpa during the filling process.
Preferably, the filling rate of the working medium in the step f is 3.7 g/s-7.4 g/s,
preferably, the back-discharge rate of the working medium in the step h is 0.37 g/s-0.74 g/s.
Preferably, the reservoir is a diaphragm bellows reservoir.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, a liquid level indicating functional component is not required to be arranged on the liquid storage device or the fluid loop system, the production structure of the liquid storage device is not required to be specified, the drain-back calculation system is fully combined with boundary constraint conditions, the filling process is scientifically combined, and the operation is simple;
2. the invention is not limited to a liquid storage device with certain design parameters, is not limited to filling at certain specific room temperature, is not limited to a specific fluid circuit working medium, is not limited to the relative altitude of the liquid filling tank and the fluid circuit, and has universality;
3. the invention scientifically combines common metering means, is not limited to one-time successful filling and repeated filling, fully combines the boundary condition constraint of a system, and has universality on a common fluid loop;
4. the invention can obtain the working medium room temperature and the maximum filling quantity of the fluid loop system by using a simple common filling system, and scientifically builds a calculation system for calculating the liquid side return discharge quantity and the gas side pressure maintaining pressure of the liquid storage device based on the on-orbit operation requirement of the fluid loop system and the structural functional characteristics of the liquid storage device.
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 diagram of a fluid circuit system;
FIG. 2 is a schematic view of a filling system;
FIG. 3 is a flow chart of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will aid those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any manner. 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.
The invention provides a universal filling method of a fluid circuit for accurately calculating the return displacement of a reservoir, which comprises a reservoir return displacement calculating step and a fluid circuit return displacement filling step,
calculating the return displacement of the reservoir: inquiring to obtain different filling temperatures T of the working medium r Lower density p r Calculating to obtain the return displacement m' of the liquid accumulator and the filling pressure P at the air side of the liquid accumulator by a liquid accumulator return displacement calculation method according to the maximum filling amount m of the system;
a fluid loop back-discharge type filling step: and filling the fluid circuit according to the reservoir return displacement m' and the reservoir air side filling pressure P calculated in the reservoir return displacement calculation step by a fluid circuit return displacement type filling method.
To better illustrate the present solution, test calculations were performed in conjunction with the accompanying figures 1-3 and examples.
This example was studied with a spatial single-phase fluid circuit system, see fig. 1. The system requires the working pressure between 0.2MPa and 0.4MPa, the working temperature between 20 ℃ below zero and 35 ℃, and the system leakage rate is not more than 1 multiplied by 10 within 3 years of rail operation -5 Pa·m 3 And s. The reservoir is a diaphragm bellows type reservoir which is formed by processing and welding stainless steel, and the overall size envelope is 213mm multiplied by phi 118 mm. The internal volume of the reservoir was extracted by Spaceclaim to obtain the gas side volume V of the reservoir in the free state of the bellows g 328ml, air side volume Δ V of the reservoir with the bellows in the upper cap limit position 0 23 ml. The known filling working medium is perfluorinated triethylamine, and different filling temperatures T are obtained through inquiry r Lower density ρ r And performing gradient partition calculation by taking 0.1kg as a gradient according to the maximum charging amount m of different systems, and calculating by using the step of calculating the return displacement m' of the liquid storage device to obtain the charging temperature T r Is a filling table at 15 ℃, 16 ℃, 17 ℃, 18 ℃, 19 ℃, 20 ℃, 21 ℃, 22 ℃, 23 ℃, 24 ℃ and 25 ℃, and the calculation steps are as follows,
step 1: pumping under Spaceclaim environmentTaking the inner volume of the liquid reservoir to obtain the gas side volume V of the liquid reservoir when the corrugated pipe is in a free state g And the air side volume DeltaV of the reservoir when the bellows is in the limit position of the upper cover 0 ；
And 2, step: inquiring working medium temperature T based on characteristics of working medium r Density of lower working medium rho r For a specific working medium, the coefficient of expansion β of the working medium can also be calculated, wherein the coefficient of expansion β of the working medium is defined as:
wherein, v is the specific volume of the working medium, and is defined as the reciprocal of the density, i.e. v is 1/rho, and the unit is m 3 /kg；
And step 3: working medium density rho under rail high-temperature working condition temperature Tmax based on working medium characteristic query h ；
And 4, step 4: calculating the return displacement m' of the reservoir:
and 5: the volume expansion amount delta V of the reservoir bellows from the ground filling temperature to the free state is calculated according to the following formula 1 ：
Step 6: calculating the filling pressure P on the gas side of the liquid storage device:
wherein, P max The maximum reservoir gas side was filled with pressure.
And (3) calculating to obtain a table of the return displacement m 'of the liquid accumulator and the gas side pressure P of the liquid accumulator shown in the table 1, wherein the table 1 shows the return displacement m' of the liquid accumulator and the gas side pressure P of the liquid accumulator when the filling working medium is at the temperature of 20 ℃.
TABLE 1
And referring to the data in the table, the working medium is filled according to the fluid circuit loop-type filling step, which comprises the following steps,
step a: installing and debugging the filling system according to the figure 2, wherein the filling system comprises a filling box, a mass flow meter, a vacuum pump, a pressure gauge, valves and a liquid level indicator, and in the installing and debugging process, redundant materials are prevented from entering a pipeline, the system is ensured to be in a clean state, instruments and meters of each part are in a normal state, and the valves of each part are in a closed state before filling;
step b: and filling the filling tank, namely filling the filling tank to ensure that the working medium in the filling tank reaches the specified liquid level. In the filling process, the cleanness of the filling working medium is ensured, and the introduction of redundant substances is avoided;
step c: vacuumizing the gas side of the filling tank, vacuumizing the gas side of the filling tank by using a vacuum mechanical pump, and continuously vacuumizing for 30 minutes after the reading of a pressure gauge is stable to finish working medium degassing;
step d: standing for 60 minutes, and measuring to obtain working medium temperature, namely filling temperature T r 20 ℃. Opening a sampling valve at the liquid side of the filling box to enable the working medium to flow out of the sampling port, detecting the temperature of the sampled working medium, namely the filling temperature, and recording;
step e: the reservoir gas side and the fluid circuit liquid side are evacuated. Opening a vacuumizing valve and a gas-side valve and a liquid-side filling valve of a fluid loop, vacuumizing two sides of the fluid loop simultaneously, and closing the gas-liquid filling valve and the vacuumizing valve when the vacuum degree of the loop is less than 1 Pa;
step f: working medium is filled at the liquid side of the fluid loop. And opening a liquid side pipeline valve of the filling tank to enable the filling pipeline to be filled with liquid, and adjusting the flowmeter to enable the reading of the flowmeter to return to zero. And then opening a fluid circuit filling valve, controlling the filling rate to be 3.7-7.4 g/s in the filling process until the circuit liquid side is full, balancing the system pressure, and closing a filling tank liquid side valve, wherein the flow rate of a flow meter is zero. And (4) counting the total mass of the filling working medium according to the flowmeter, namely, the maximum filling amount m of the system is 5.2 kg. In the filling process, the pressure difference of the gas-liquid side of the liquid reservoir is not more than 0.10 Mpa;
step g: according to the filling temperature T r Inquiring the table 1 with the maximum charging amount m of the system being 5.2kg at 20 ℃, obtaining 0.164400kg of the return discharge amount m' of the liquid storage device, and 0.313MPa of the charging pressure P on the gas side of the liquid storage device;
step h: the liquid side of the fluid circuit is drained back. And opening the gas path filling valve to fill nitrogen to the gas side, gradually pressurizing to 0.1MPa, and stopping pressurizing to keep the gas side of the loop communicated with the gas distribution table. And slowly opening a liquid side back-discharge port valve, and controlling the back-discharge rate of the working medium to be 0.37-0.74 g/s. Closing the liquid side back discharge port valve and closing the liquid circuit filling valve until the liquid back discharge volume reaches a target value m' ═ 0.164400 kg;
step i: air is supplied to the air side of the liquid reservoir. Adjusting a loop gas side gas distribution table, continuously filling nitrogen gas to the loop gas side for pressurization, and closing a gas path filling valve after the loop gas side is pressurized until the target pressure P is 0.313 MPa;
step j: and (5) the filling system is disassembled, and the fluid loop filling is completed.
In addition to the above method, the reservoir displacement back calculation step may be compiled into windowing software, and in step g, the filling temperature T is calculated r Inputting the temperature of 20 ℃ and the maximum filling amount m of the system of 5.2kg into windowing software to obtain the return displacement m' of the liquid accumulator of 0.164400kg and the filling pressure P of the gas side of the liquid accumulator of 0.313MPa, and directly calculating the filling temperature T with the known filling temperature through the windowing software r The reservoir return displacement m' and the reservoir air side filling pressure P corresponding to the maximum system filling amount m do not need to calculate other unnecessary results, the workload is reduced, and the query time is saved.
The invention does not need to equip the liquid level indicating functional component on the liquid storage device or the fluid loop system, does not need to specify the production structure of the liquid storage device, and the drain-back calculation system is fully combined with the boundary constraint condition, scientifically combined with the filling process, and has simple operation.
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 (9)
1. A fluid circuit charging method for calculating the back displacement of a reservoir is characterized by comprising a reservoir back displacement calculating step and a fluid circuit back displacement charging step,
calculating the return displacement of the reservoir: inquiring to obtain different filling temperatures T of the working medium r Lower density ρ r Calculating to obtain the return displacement m' of the liquid accumulator and the filling pressure P at the air side of the liquid accumulator by a liquid accumulator return displacement calculation method according to the maximum filling amount m of the system;
a fluid circuit back-discharge type filling step: filling the fluid circuit according to the reservoir return displacement m' calculated in the reservoir return displacement calculation step and the reservoir air side filling pressure P by a fluid circuit return displacement type filling method;
the reservoir return displacement calculating step comprises the following steps:
step 1: the internal volume of the reservoir is extracted in a Spaceclaim environment to obtain the gas side volume V of the reservoir when the corrugated pipe is in a free state g And the air side volume DeltaV of the reservoir when the bellows is in the limit position of the upper cover 0 ；
Step 2: characteristic query filling temperature T based on working medium r Density of lower working medium rho r ；
And step 3: inquiring working medium density rho under high-temperature working condition temperature Tmax based on characteristics of working medium h ；
And 4, step 4: calculating the return displacement m' of the reservoir:
and 5: the volume expansion amount delta V of the reservoir bellows from the ground filling temperature to the free state is calculated according to the following formula 1 ：
Step 6: calculating the filling pressure P on the gas side of the liquid storage device:
wherein, P max The maximum reservoir gas side was filled with pressure.
2. The method of claim 1, wherein the method of calculating the displacement of the reservoir is compiled into windowing software and the charging temperature T is input r And the maximum filling amount m of the system, and the return displacement m' of the liquid accumulator and the gas side filling pressure P of the liquid accumulator are obtained.
3. The method of claim 1, wherein the method of calculating the displacement of the accumulator is programmed as a lookup table of fluid circuit charging parameters by looking up a charging temperature T r And the maximum filling amount m of the system, and the return displacement m' of the liquid accumulator and the gas side filling pressure P of the liquid accumulator are obtained.
4. The method of claim 3, wherein the method comprises querying a table of parameters for filling the fluid circuit to obtain a maximum system filling quantity m with an accuracy of 0.1kg, a return reservoir volume m' with an accuracy of 1mg, and a reservoir gas side filling pressure Pwith an accuracy of 1 kPa.
5. The fluid circuit charging method for calculating the return displacement of a reservoir of claim 1, wherein the fluid circuit return displacement charging method comprises the steps of:
step a: the filling system is installed and debugged, and comprises a filling box, a mass flow meter, a vacuum pump, a pressure gauge, a valve and a liquid observing device;
step b: filling the filling tank to enable working media in the filling tank to reach a specified liquid level;
step c: vacuumizing the gas side of the filling box to finish degassing of the working medium;
step d: measuring the temperature of the working medium after standing, i.e. the filling temperature T r ；
Step e: vacuumizing the air side of the liquid reservoir and the liquid side of the fluid loop;
step f: filling working media at the liquid side of the fluid loop, controlling the filling rate of the working media in the filling process, and counting the total mass of the filled working media according to the flow meter to obtain the maximum filling amount m of the system;
step g: by filling temperature T r Obtaining the return displacement m' of the liquid accumulator and the gas side filling pressure P of the liquid accumulator according to the maximum filling amount m of the system;
step h: the liquid side of the fluid loop is drained back, and the back drainage speed of the working medium is controlled until the back drainage volume of the liquid reaches a target value m';
step i: supplementing gas to the gas side of the liquid storage device, adjusting a gas distribution table at the gas side of the loop, continuously filling nitrogen to the gas side of the loop for pressurization, and pressurizing to a target pressure P1;
step j: and (5) the filling system is disassembled, and the fluid loop filling is completed.
6. The method of claim 5, wherein in step f, the pressure difference on the gas-liquid side of the reservoir is not greater than 0.1MPa during the filling process.
7. The fluid circuit filling method for calculating the return displacement of the accumulator according to claim 5, wherein the filling rate of the working medium in the step f is 3.7g/s to 7.4 g/s.
8. The method of claim 5, wherein the back-flow rate of the working medium in step h is 0.37-0.74 g/s.
9. The method of filling a fluid circuit for calculating the return displacement of a reservoir of claim 1, wherein said reservoir is a diaphragm bellows reservoir.
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| CN110104225A (en) * | 2019-04-25 | 2019-08-09 | 北京控制工程研究所 | A kind of in-orbit loading system of voltage-multiplying type satellite based on board-like surface tension propellant tank |
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| US20020112888A1 (en) * | 2000-12-18 | 2002-08-22 | Christian Leuchtenberg | Drilling system and method |
| ITBO20060121A1 (en) * | 2006-02-17 | 2007-08-18 | Magneti Marelli Powertrain Spa | METHOD AND FILLING SYSTEM OF A HYDRAULIC CIRCUIT WITH COMMAND FLUID. |
| RU2368549C1 (en) * | 2008-06-16 | 2009-09-27 | Открытое акционерное общество "Информационные спутниковые системы" имени академика М.Ф. Решетнева" | Method for control of hydraulic accumulator design quality and manufacturing technology |
| US8781652B2 (en) * | 2012-07-27 | 2014-07-15 | Linquest Corporation | Estimation of propellant remaining in a satellite |
| CN104504176B (en) * | 2014-12-02 | 2016-05-04 | 北京空间飞行器总体设计部 | The matching process of reservoir and working medium filling weight in weight-driven two-phase fluid loop |
| US10023454B2 (en) * | 2016-06-09 | 2018-07-17 | Spacepharma SA | Multichannel liquid delivery system |
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| 空间流体回路的动态特性建模与闭环控制仿真;施哲栋等;《热科学与技术》;20181231;第17卷(第6期);全文 * |
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