RU2392200C1 - Method for hydraulic manifold of spacecraft heat control system filling with coolant and device for its realisation - Google Patents

Abstract

FIELD: power engineering.

SUBSTANCE: hydraulic manifolds are assembled from pure, dry and tight elements, filled with pure dissolvent, maintained under increased pressure permissible for hydraulic manifold, dissolvent is circulated and drained from hydraulic manifold, vacuum drying is carried out, values of changes in volumes of system hydraulic manifold and manifolds of filling device are identified. Prior to filling of hydraulic manifold, cavity over mirror of deaerated coolant is vacuumised for a short period of time to control extent of its deaeration, and after complete filling of hydraulic manifold by coolant twice: before starting operations for control of purity and after provision of required purity of coolant. Device comprises filling and drain tanks with level metres connected to vacuum device and source of compressed gas by means of manifolds, which are equipped with valves and metres of pressures and temperature, and also drain and filling manifolds, in the latter of which a hydraulic pump is installed with metre of coolant flow, filter and reference reservoir. Between inlet and outlet of device manifold and inlet and outlet of system hydraulic manifold there are two coupling devices provided: to outlet of filling manifold inlet of the first coupling device is connected, comprising one inlet and two outlets communicated via valves to specified inlet, and to inlet of drain manifold the outlet of the second coupling device is connected, comprising one outlet and two inlets communicated via valves with specified outlet. Detachable filter for control of coolant purity is installed downstream.

EFFECT: increased reliability and provision of high-quality manufacturing of spacecraft hat control system.

2 cl, 3 dwg

Description

The invention, created by the authors in the order of performance of a job, relates to space technology - to methods and devices for refueling with a coolant (liquid or two-phase) hydraulic lines of thermal control systems (CTP) of spacecraft (SC), for example telecommunication satellites.

Currently, telecommunication satellites, as a rule, are created with a period of active existence in orbit (CAC) of at least 15 years and for guaranteed provision of CAC:

- the STR hydraulic line is made up of two (duplicated) hydraulic circuits, each of which has one input (for example, a hydraulic connector) and one outlet (for example, a hydraulic connector) for refueling, and each circuit has one volume compensator (hydraulic accumulator) a sealed (ampouled) gas cavity which is filled with a two-phase working fluid and is separated from the liquid cavity by a bellows (see Fig. 1, where 1 is the first circuit; 2 is the second circuit; 20 are the outputs of the first and second circuits - hydraulic output; 21 - inputs of the first and second circuits - hydraulic input; 7 - compensator for the volume of the primary circuit; 8 - compensator for the volume of the secondary circuit; 9, 10 - bellows; 11, 12 - hydraulic pumps; 13, 14 - panels with devices; 15, 16 - flexible pipelines);

- the STR line must be manufactured in high quality: clean and sealed internal cavities of the hydraulic line must be filled with an appropriate amount of clean deaerated coolant, i.e. The parameters of high-quality production of the hydraulic highway are:

- after assembling the hydraulic line before refueling with the coolant, the degree of tightness of the STR line must be checked: the total leakage of the internal cavity of the hydraulic line due to leakage of the control medium, for example 100% helium, should be no more than the norm specified in the technical documentation (TD);

- after ensuring the required tightness, the evacuated internal cavity must be filled with a certain amount of clean deaerated coolant:

previously, the internal cavity should be evacuated, for example, to a pressure not exceeding 1 mm Hg;

refueling medium must be deaerated, i.e. dissolved air is removed from it, for example, the partial pressure of air should be no more than 5 mm Hg;

after refueling the hydraulic line with a certain amount of deaerated coolant in the hydraulic line there should not be bubbles of undissolved air exceeding the permissible norm.

And the envisaged technology for the production of STR - a method for refueling a hydraulic highway with a coolant (pressurized) and a device for its implementation (refueling) should provide the above requirements for the quality production of STR.

At present, there is a known method for removing non-leaking coolant residues from a hydraulic line according to RU Patent No. 2,307,774 [1] by removing non-leaking coolant residues by pre-mixing it with a completely evaporating coolant component and then draining the resulting mixture and carrying out vacuum drying. For the almost complete removal of non-volatile residues (components) of the coolant, the above amount of work (cycle) must be repeated many times (up to 5 times). Practice shows that on average it will take at least 10-12 hours to complete one such cycle for existing satellites. Thus, if you perform one cycle of removal of coolant residues, the hydraulic line is not properly prepared for leak testing, and an increase in the number of cycles leads to unacceptable costs of material and technical means (isooctane, electricity, etc.) and the time of construction of the STR.

Also known are methods of refueling coolant with hydraulic lines and devices for their implementation (refueling machines) according to patents RU No. 2300492 [2], 2308402 [3], 2317925 [4].

According to [2], to measure the volume of undissolved gas bubbles in the hydraulic line using an additional device with a level gauge newly introduced into the refueling tank design, the STR line is completely disconnected from the refueling tank under overpressure, i.e. the STR line, until the next operation of opening the filling valve of the STR line, remains without compensation for the temperature change in the coolant volume and there is a high probability of an unacceptable increase in pressure as a result of an increase in the temperature of the surrounding STR line, up to damage to the hydraulic line - loss of tightness or due to being unacceptably high pressure CTP loss of tightness of the hydraulic line in the future due to hidden marriage as a result of exposure to unacceptably high pressure in it; in addition, the known method for determining the volume of gas bubbles provides an unreliable measurement of the volume of gas bubbles, because there are always elastic elements in the STR (for example, flexible pipelines) and a change in the volume in the level gauge is quite possible and is due to the elastic deformation of the elastic elements, but there may not be gas bubbles in the hydraulic line. According to the known method, if the measured volume change in the level gauge is more than permissible (although this can be caused only by the elastic deformation of the elastic elements of the STR line), it is necessary to drain and refill the hydraulic line with a coolant (in principle, many times), which

unacceptable in the conditions of manufacture of STR, because at the same time, aimless unjustified expenses of material and technical means and time of production of the STR will be required. In addition, the introduction of an additional device with a level gauge in the design of the refueling machine complicates its design, increases the number of valves operated by the operators, and therefore, it increases the likelihood of operator error in the process of filling the CTP, and it is quite possible with negative consequences for the CTP, for example, in the case of untimely communication of the hydraulic line completely filled with coolant with the tanker.

According to [3], to measure the volume of undissolved bubbles in the coolant by measuring the smallest possible structural volume of the gas cavity of the compensator, as in [2], a method is used to disconnect the hydraulic line completely filled with coolant (and under overpressure) from the tanker’s tanks, i.e. . the likelihood of the destruction of the hydraulic line or premature loss of its tightness in the conditions of the CAC; just as in [2], the volume of undissolved gas measured by this method is actually quite possibly not the volume of undissolved gas in the coolant of the hydraulic line, but a change in the volume of the hydraulic line due to the elastic deformation of its elastic elements.

As can be seen from the foregoing, the known technical solutions according to [2] and [3], in particular, do not provide reliable control of the presence of undissolved gas bubbles, not to mention increasing the accuracy of control of the volume of undissolved bubbles, which is incorrectly described in these known solutions.

According to [3], the refueling device has a rather simple and optimal design for ground operation and provides measurement of refueling quality parameters.

However, as the analysis showed, if the STR line contains two circuits, in the case of using the device [3], the process of filling the STR with a coolant is complicated: it is necessary to repeat the filling of the STR twice; taking this into account, if it is necessary to control the purity of the coolant charged into each circuit for the absence of mechanical particles in it, the complexity of refueling increases even more and the duration of refueling increases even more (the presence of mechanical particles in the coolant (hydraulic line) above a certain value is unacceptable to prevent jamming of mobile parts of the CTP, for example hydraulic pumps), and the above complication of the process of filling the coolant can adversely affect the quality of the CTP, as well as The duration of refueling of the STR.

According to [4], the proposed device for refueling with a liquid coolant СТР КА differs from a well-known refueling machine according to [3] in that the proposed refueling device is substantially complicated without achieving visible improvements in the quality of filling with a coolant of the STR line:

- to control the degree of deaeration and the time of deaeration of the coolant: based on the experience of refueling with the STR-KA, the existing refueling tank, in accordance with [3], provides quite high-quality refueling of the STR with a deaerated coolant - there have been no comments in this part during SAS satellites, for example, in the last 20 years;

- to ensure the evacuation of refueling lines and their tightness: many years of experience have shown that with the high-quality assembly of joints (with the appropriate moment tightening) of the filling and drainage lines, their tightness is ensured, while the total vacuum time of the mains using high-quality (previously dried) refueling elements and refueling and drainage lines are small: does not exceed, for example, 2 hours, with a total refueling time, for example, ≈48 hours; those. it is relatively small and all the complications proposed in [4] only complicate the process and increase the number of operations performed by operators during refueling, and there is a high probability of an increase in the appearance of errors when working with negative consequences for the STR.

Thus, as the analysis showed, the proposed well-known technical solutions cannot be accepted for implementation in the production of CTP satellites due to the deterioration of the quality of the CTP after (when) using them when refueling hydraulic lines with a coolant (destruction of the hydraulic line during refueling is possible or hidden marriage: loss by the hydraulic line tightness at the initial stage of the SAS due to the stay of the hydraulic line under unacceptably high pressure), and the process of refueling with a coolant is complicated and a highly reliable purity control of the filled coolant, and before filling with coolant before checking the tightness of the hydraulic line and after checking, insufficient preparation of the hydraulic line is provided.

Thus, a common significant drawback of the known technical solutions [1], [2], [3], [4] is the insufficiently high reliability of ensuring the high-quality production of STR KA with SAS, for example, at least 15 years, in the process of preparing for refueling, refueling with a coolant hydraulic lines and monitoring the quality parameters of refueling with a coolant.

An analysis of the sources of information on the patent and scientific and technical literature showed that the closest in technical essence prototypes of the proposed technical solutions are the method of refueling the STR KA hydraulic line with the coolant and the device for refueling the STR KA hydraulic line based on those described in [3].

On the basis of [3], the method of refueling with the coolant of the STR line is as follows (see figure 3):

- carry out the Assembly of the hydraulic line STR 1 mounting welding of joints between the elements;

- measure the volume of the hydraulic line STR 1 using the reference tank 2 (connecting it to the input of the hydraulic highway);

- they check the degree of tightness of the hydraulic line STR 1, for which the STR is placed in a vacuum chamber, 100% helium is fed into the hydraulic line and its leakage is determined, which should be no more than specified in the TD;

- carry out the deaeration of the coolant in the refueling tank 3, for which the cavity above the coolant mirror is vacuumized until the pressure above the mirror is established to a stable value equal to the pressure of the saturated coolant vapor at the measured temperature;

- vacuum the STR 1 hydraulic line and the corresponding refueling lines, for example, to a pressure of not higher than 1 mm Hg;

- under overpressure is carried out a complete filling of the hydraulic line STR 1, incl. full filling of the liquid cavity of the volume compensator 4 (i.e., at this time, the bellows of the volume compensator is fully compressed and the volume of the gas cavity is structurally the smallest possible value);

- then close the filling 5 and drain 6 valves of the hydraulic line (i.e., from that moment on, the STR line completely filled with the coolant remains without compensation for the temperature change in the coolant volume and, if the ambient temperature rises accordingly, the pressure in the STR line increases above the permissible value, up to destruction);

- using the reference tank 7, the volume (structurally minimal possible) of the gas cavity of the volume compensator 4 STR is actually twice measured and based on the measured data, it is judged (as indicated above - incorrectly) about the amount of undissolved gas in the STR hydraulic line;

- report the gas cavity with the atmosphere and open the filling valve 5 of the hydraulic line and communicate with the cavity of the filling tank 3, which is under overpressure (i.e., only from this moment on will the STR line be compensated for temperature changes in the volume of the coolant);

- close the filling valve 5, open the drain valve 6, close the valves 35 and 36, then open the end valve 8 and drain the required dose of coolant from the liquid cavity of the volume compensator and close the drain valve 6;

- measure the volume of the gas cavity, which should be equal to the sum of the volumes: the minimum structurally possible volume of the gas cavity of the compensator volume 4 plus the fused dose of the coolant;

- disassemble the refueling scheme of the coolant STR.

The known device for refueling the coolant of the hydraulic line (refueling device) [3], docked with the refueling coolant of the hydraulic line STR 1 KA, is shown in FIG. 3, where the refueling unit 9 includes a refueling 3 and a drain 10 tanks with level gauges 11 and 12 connected to a vacuum unit 13 and a source of compressed gas, 14 lines, which are equipped with valves and pressure and temperature meters, as well as a drainage 15 and 16 filling line, in which a hydraulic pump 17 with a coolant flow meter is installed, input 18 and output 19 of which during refueling respectively communicated with the outlet 20 and the inlet 21 gidromagistrali system, the filter 22 mounted in a gas line prior to its output, and reference capacitance 7 (2).

As mentioned above, a significant drawback of the known technical solutions [3] is the insufficiently high reliability of ensuring the high-quality production of STR KA with SAS, for example, for at least 15 years, in the process of preparing for refueling, refueling with the coolant of the hydraulic line and monitoring the quality parameters of refueling with the coolant.

The aim of the technical solutions proposed by the authors is to eliminate the above significant drawback.

The goal is achieved by the fact that:

1. In the method of filling with a coolant of the STR-KA hydraulic line, which contains a volume compensator in each liquid circuit, the sealed gas cavity of which is filled with a two-phase working fluid, which includes, prior to filling the coolant, assembling the hydraulic line by welding the joints between the elements, measuring the volume of the dry hydraulic line and checking the tightness of the hydraulic line, then connecting hydraulic lines of the system to the lines of the filling device, full filling of the previously evacuated hydraulic lines deaerated coolant under excess pressure, with undissolved gas in the hydraulic line of less than acceptable size, after which the dose of the coolant is drained from the liquid cavity of the volume compensator and the gas volume is controlled - after assembling the hydraulic line from clean, dry and sealed elements, it is charged with a clean solvent compatible with the materials of the hydraulic line evaporated during vacuum drying without residues, kept under high pressure, acceptable for the hydraulic line, circulate and drain the solvent l from the hydraulic line, vacuum drying is carried out, the magnitude of the change in the volume of the hydraulic line of the system and the lines of the refueling device (жестΔV _gesture ) involved in refueling the system is determined by elastic deformation by applying two different gas pressures to them, and then, after checking the tightness of the hydraulic line, impregnation of possible weld micro-leaks with sealant and carry out its polymerization, and deaeration of the coolant in the refueling tank is carried out in advance and briefly before refueling the hydraulic line vacuum the cavity over the mirror of the deaerated coolant to control the degree of deaeration, and after the hydraulic line is completely filled with coolant twice: before starting the cleanliness control operations and after obtaining the required cleanliness of the coolant - there are no mechanical particles on the removable filter to control the cleanliness of the coolant when at least one coolant is pumped through it the volume of the hydraulic line with a flow rate of at least 70 cm ³ / s, the number of undissolved gas bubbles is controlled according to the ratio

ΔV _N.G. = V _{gm ''} -V _{gm '} -∑ΔV _gesture ≤ | ΔV _ngdop |,

where ΔV _n.g. - the volume of undissolved gas bubbles in the hydraulic line filled with deaerated coolant, dm ³ ;

V _{gm "} , V _{gm '} - the measured values of the volumes of coolant in the refueling tank, the liquid cavity of which is in communication with the hydraulic line of the system, at the above two different gas pressures above the coolant mirror in the refueling tank, dm ³ ;

∑ΔV _gesture - the above-defined total change in the volume of the hydraulic system and the lines of the device for refueling at the above two different gas pressures in them, dm ³ ;

ΔV _n.g.dop - permissible norm according to the technical documentation, dm ³ .

2. In the device for refueling with the coolant of the STR-KA hydraulic highway, which includes refueling and drainage tanks with level gauges connected to the vacuum unit and the source of compressed gas by pipelines, which are equipped with valves and pressure and temperature meters, as well as a drain and refueling pipe, in the last of of which a hydraulic pump with a coolant flow meter is installed, the input and output of which during refueling are respectively communicated with the output and input of the system hydraulic line, a filter installed in the gas station of the main line before its output, and the reference capacity — between the input and output of the device’s main line and the output and input of the system’s hydraulic line — two interface devices are provided: the input of the first interface device containing one input and two outputs communicated through valves with the specified input is connected to the output of the fuel line and the output of the second interface device is connected to the input of the drainage line, containing one output and two inputs communicated through the valves with the specified output, and a removable filter for monitoring istoty coolant installed after him,

which, according to the authors, is the essential distinguishing features of the technical solution proposed by the authors.

As a result of the analysis carried out by the authors of the well-known patent and scientific and technical literature, the proposed combination of significant distinguishing features of the claimed technical solution was not found in the known sources of information and, therefore, the known technical solutions do not exhibit the same properties as in the inventive method for refueling the heat transfer medium of the STR KA KA and a device for its implementation.

The proposed method for refueling the STR-KA hydraulic highway with the coolant includes the operations performed in the following sequence (see Fig. 1, which shows the hydraulic circuit diagram of the STR after assembly, and Fig. 2 shows the STR scheme, whose hydraulic line is connected to the lines of the refueling device proposed by the authors hydraulic lines STR KA):

- carry out the assembly of the hydraulic line STR 1 from clean, dry and sealed elements by assembly welding of joints between the elements;

- after assembly of the STP 1 hydraulic line, it is mounted by welding with a clean solvent, compatible with the hydraulic line materials that evaporate during vacuum drying without residues, kept under increased pressure acceptable for the hydraulic line, the solvent is circulated and drained from the hydraulic line, and vacuum drying is carried out and the magnitude of the change in the volume of the hydraulic system is determined 1 and highways refueling device (ΣΔV _gesture) 9 involved in refueling system 1 by elastic deformation of the excess supply of two different s gas pressure therein, for example 0.5 atm and 1 atm;

- measure the volume of the hydraulic line 1 using a reference tank 2 (connecting it to the input of the hydraulic line);

- they check the degree of tightness of the hydraulic line 1, for which the CTP is placed in a vacuum chamber, 100% helium is fed into the hydraulic line and its leakage is determined, which should be no more than specified in the TD;

- then, after checking the tightness of the hydraulic line 1, impregnate possible micro-leaks of the welds with a sealant and carry out its polymerization;

- deaeration of the coolant in the refueling tank 3 is carried out in advance (for example, no more than 3 hours) and before refueling the hydraulic line 1, a short evacuation (for example, 10-20 minutes) of the cavity above the mirror of the deaerated coolant is carried out to control the degree of deaeration of the coolant (deaeration of the coolant is carried out in the refueling tank why the cavity above the coolant mirror is vacuumized until the pressure above the mirror is established to a stable value equal to the pressure of saturated coolant vapors when measured temperature);

- vacuum the STR 1 hydraulic line and the corresponding refueling lines, for example, to a pressure of not higher than 1 mm Hg;

- under overpressure (for example, not more than 1.5 atmospheres), the hydraulic line 1 is completely filled, incl. full filling of the liquid cavity of the volume compensator (i.e., at this time, the bellows of the volume compensator is fully compressed and the volume of the gas cavity has a structurally minimum possible value);

- after the hydraulic line 1 has been completely filled with the coolant twice: before the cleanliness control operations begin and after the required coolant is cleaned, there are no mechanical particles on the removable control filter 23 when at least one volume of the hydraulic fluid is pumped through it with a flow rate of at least 70 cm ³ / s, control the number of undissolved gas bubbles according to the ratio (the STR line is connected to the cavity of the filling tank; in these measurements, over the coolant mirror in the filling tank of the But they set, for example, 0.5 ati and 1 ati)

ΔV _N.G. = V _{gm ''} -V _{gm '} -∑ΔV _gesture ≤ | V _ngdop |,

where ΔV _ng is the volume of undissolved gas bubbles in the hydraulic line charged with the deaerated coolant, dm ³ ;

V _{m. ''} , V _{g. M. '} - the values of the volume of the coolant measured by the level gauge 11 in the refueling tank, the liquid cavity of which is connected to the system hydraulic line, at the above two different gas pressures above the coolant mirror in the refueling tank, dm ³ ;

∑ΔV _gesture - the above-defined change in the volume of the hydraulic system and refueling lines at the above various gas pressures in them, dm ³ ;

V _ng.g.add - the norm admissible according to the technical documentation (which in practice, as a rule, is set equal to the total measurement error), dm ³ ;

- close the valves 35, 36, open the (drainage) valves 30, 31 and close the (filling) valves 32, 33, then open the end valve 8 and drain the required dose of coolant from the liquid cavity of the volume compensator and close the drainage valve 6;

- control the volume of the gas cavity using the reed switch block (see patent RU No. 2209750), which should be equal to the sum of the volumes: the minimum structurally possible volume of the gas cavity of the volume compensator plus the fused dose of the coolant;

- if the comments on previous operations are not recorded, then the STR 1 hydraulic pipe is filled with heat transfer agent qualitatively (made qualitatively) and the construction scheme of the CTR gas supply coolant is disassembled.

As can be seen from the foregoing, the proposed method of refueling the heat carrier STR KA:

- improves the quality of preparation of hydraulic line 1 (individual elements of which are clean, dry and airtight) before checking its tightness as a result of washing it with a clean solvent after assembly welding - possible contaminants that could have formed during installation welding are removed from the hydraulic line, then as a result of vacuum drying reveals possible micro-leaks;

- excludes the stay of the hydraulic line STR 1 under the influence of unacceptably high pressure as a result of measuring changes in the volume of hydraulic lines due to elastic deformation by applying gas pressures with acceptable values;

- improves the quality of the preparation of the hydraulic highway in terms of increasing the reliability of ensuring tightness as a result of impregnation of possible micro-flows of welds with sealant;

- the quality of the deaeration of the coolant in the refueling tank is provided in advance by its deaeration, because the tanker is not involved in the work during the assembly of the hydraulic highway;

- excludes the presence of the STR 1 hydraulic line under the influence of an unacceptably high coolant pressure in it during the measurement of the volume of undissolved gas bubbles in the hydraulic line as a result of the message during these measurements of the hydraulic line 1 with the cavity of the refueling tank 3 having a volume free of the coolant above the heat carrier mirror;

- the quality of the refueling of the hydraulic line 1 without undissolved gas bubbles is ensured by excluding from the measurement results the changes in the volumes of the hydraulic lines as a result of elastic deformation and by measuring the volume of undissolved gas bubbles after checking the purity of the coolant;

- the quality of the coolant and the hydraulic line to ensure the absence of mechanical particles in them above a certain size is ensured by pumping the coolant through a removable control filter of at least one volume of the hydraulic line with a flow rate of at least 70 cm ³ / s (according to experimental data, with such a pumping volume and flow rate, the hydraulic lines and particles of the coolant are completely washed out of the STR line and settle, if they were in the coolant, on the grid of the control filter).

The proposed device refueling the coolant STR KA shown in figure 2 and includes the following elements:

- refueling and drainage tanks 3, 10 with level gauges 11, 12, connected to a vacuum unit 13 and a source of compressed gas 14 lines, which are equipped with valves and pressure and temperature meters, as well as drain and refueling lines 15, 16, the latter has a hydraulic pump 17 with a coolant flow meter, input 18 and output 19 of which, through two interface devices 24, 25 during the fueling process, respectively communicate with output 20 and input 21 of the hydraulic circuit of system 1, the filter 22 installed in the fuel pipe 16 in front of it Exit 19 and the reference capacitance 2;

- to the output 19 of the fueling line connected to the input 27 of the first interface device 25, containing one input 27 and two outputs 29, communicated through valves 32, 33 with the specified input 19, and to the input 18 of the drain line 15 connected to the output 26 of the second interface device 24, containing one output 26 and two inputs 28, communicated through the valves 30, 31 with the specified output 26, and a removable control filter 23 is installed after it (in figure 2, pos.4, 5, 6, 7, 34 - valves).

As can be seen from the above, the proposed device for refueling the coolant STR KA has the following positive characteristics:

- as a result of introducing into the composition of the device two interface devices 24, 25, the process of refueling the heating medium 1 containing two duplicated circuits is simplified, and, therefore, the reliability of ensuring high-quality manufacturing of STR is increased;

- as a result of installing a removable control filter 23 after the output 26 of the second interface device 24, simultaneous flushing of both circuits of the hydraulic line 1 is ensured with the required cleanliness (quality) of the hydraulic line and coolant tucked into both circuits.

It should be noted that the method proposed by the authors for refueling the hydraulic fluid of the hydraulic highway and the device for its implementation are also highly effective when used for refueling the STR shown in the prototype [3].

It should also be noted if in the production of CTP satellites an automated device for filling the coolant of the CTP hydraulic line is used, then the electrical outputs of the flowmeter, pressure and temperature of the coolant, valves (for example, solenoidal) and a hydraulic pump are connected to the computer with the appropriate software via an interface converter.

Thus, as can be seen from the foregoing, as a result of using the method of refueling the STR KA hydraulic line and the device for its implementation in the production process proposed by the authors, the reliability of ensuring the high-quality production of STR KA with a long-term CAC, for example, at least 15 years, is increased and, therefore, a significant disadvantage is eliminated known technical solutions, i.e. thereby achieving the goal of inventions.

Claims (2)

1. A method for refueling a hydraulic line of a spacecraft’s thermal control system containing a volume compensator in each liquid circuit whose gas cavity is filled with a two-phase working fluid, which includes, prior to refueling, the assembly of the hydraulic line by welding joints between the elements, measuring the volume of the dry hydraulic line and then checking the tightness of the hydraulic line connection of the system hydraulic line to the lines of the refueling device, full filling will be preceded slightly evacuated hydraulic line with deaerated coolant under excess pressure with undissolved gas in the hydraulic line is less than the permissible value, after which the dose of the coolant is drained from the liquid cavity of the volume compensator and the gas cavity volume is controlled, characterized in that it is filled with clean, dry and airtight elements with clean solvent compatible with the materials of the hydraulic line, evaporating during vacuum drying without residues, maintained at a higher permissible for hydraulic lines by pressure, the solvent circulates and drains from the hydraulic line, vacuum drying is carried out, the magnitude of the change in the volume of the hydraulic line of the system and the lines of the filling device (жестΔV _gesture ) involved in the filling of the system, by supplying two different gas pressures in them, and then after checking the tightness of the hydraulic line they impregnate the possible micro-flows of the welds with a sealant and carry out its polymerization, and deaerate the coolant in the refueling tank in advance and before refueling idromines briefly vacuum the cavity above the mirror of the deaerated coolant to control the degree of deaeration, and after the hydraulic line is completely filled with coolant twice: before starting the cleanliness control operations and after obtaining the required cleanliness of the coolant, there are no mechanical particles on the removable filter to control the cleanliness of the coolant when the coolant is pumped through it gidromagistrali less than one volume at a rate of at least 70 cm ³ / s, controlled amount of undissolved gas bubbles ccording ratio
ΔV _ng = V _{gm ''} -V _{gm '} -∑ΔV _gesture ≤ | ΔV _{ng gd} |
where ΔV _ng is the volume of undissolved gas bubbles in the hydraulic line filled with deaerated coolant, dm ³ ;
V _{gm ''} , V _{gm '} - measured values of the volume of the coolant in the refueling tank, the liquid cavity of which is connected to the hydraulic line of the system, at the above two different gas pressures above the mirror of the coolant in the refueling tank, dm ³ ;
∑ΔV _gesture - the above-defined total change in the volume of the hydraulic system and the lines of the device for refueling at the above two different gas pressures in them, dm ³ ;
ΔV _n.g.dop - permissible norm according to the technical documentation, dm ³ . 2. A device for refueling the hydraulic line of the spacecraft thermal control system, including refueling and drainage tanks with level gauges, connected to the vacuum unit and a source of compressed gas by pipelines, which are equipped with valves and pressure and temperature gauges, as well as a drain and refueling line, in the latter of which a hydraulic pump with a coolant flow meter is installed, the input and output of which during refueling are respectively communicated with the output and input of the hydraulic line systems, a filter installed in the fuel line before its output, and a reference capacity, characterized in that between the input and output of the device line and the output and input of the hydraulic line of the system two interface devices are provided: the input of the first interface device containing one input is connected to the output of the fuel line and two outputs communicated through the valves with the specified input, and the output of the second interface device containing one output and two inputs communicated through entili with said outlet, and a removable filter for control of purity the coolant after it is installed.

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