CN105173462A - Liquid storage device and model selection method thereof - Google Patents
Liquid storage device and model selection method thereof Download PDFInfo
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- CN105173462A CN105173462A CN201510526013.7A CN201510526013A CN105173462A CN 105173462 A CN105173462 A CN 105173462A CN 201510526013 A CN201510526013 A CN 201510526013A CN 105173462 A CN105173462 A CN 105173462A
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- hydraulic accumulator
- satellite
- propellant
- peak acceleration
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Abstract
The invention discloses a liquid storage device. The liquid storage device is a cylinder prepared from a porous medium material, wherein the porosity rate of the porous medium material is 70-95%, and the equivalent pore diameters of the porous medium material gradually increase from the bottom surface to the top surface of the liquid storage device. The liquid storage device is a cylinder prepared from the porous medium material, the porosity rate of the porous medium material is 70-95%, and propellant is controlled at the outlet of a storage tank by virtue of the surface tension of an interstitial structure. Since the equivalent pore diameters of pores in the bottom surface of the liquid storage device are smaller than those of the pores in the top surface of the liquid storage device, bubbles in the pores have a trend of moving to large equivalent pore diameters, so that the bubbles can be effectively prevented from entering the liquid storage device, a screen mesh is not needed to be arranged at the outlet of the storage tank, and the structure is simplified. The liquid storage device is simple in structure and easy to manufacture, the screen mesh used in combination with the liquid storage device is not needed to be arranged, and the structure of the storage tank is simplified.
Description
Technical field
The present invention relates to satellite equipment field, especially, relate to a kind of hydraulic accumulator.In addition, the invention still further relates to a kind of selection method of above-mentioned hydraulic accumulator.
Background technology
Hydraulic accumulator is as the core component of tank propellant management device, storage and the gas-liquid separation of liquid can be realized by it, for thruster provides sufficient fuel continuously, the gas in the propellant of tank is avoided to enter driving engine through reservoir outlet, and effectively can suppress liquid sloshing, improve Spacecraft Control precision.
The domestic and international design to tank hydraulic accumulator is at present mainly board-like hydraulic accumulator, and board-like hydraulic accumulator is made up of multiple breather vane, and blade has aperture, and the propellant between blade is interconnected.By the surface tension between blade by Propellant Control at reservoir outlet place, and be provided with screen cloth at reservoir outlet place and prevent bubble from entering.At present, through the continuous design of engineering staff, board-like hydraulic accumulator and bubble structure of trap unite two into one by the hydraulic accumulator of a new generation, while accumulation lives propellant, by the structure of complexity by removal of bubbles, although simplify the structure, add design difficulty and difficulty of processing.
Summary of the invention
The invention provides the selection method of a kind of hydraulic accumulator and hydraulic accumulator, existing accumulator configuration be complicated to solve, the technical matters of design and difficult processing.
One aspect of the present invention provides a kind of hydraulic accumulator, and hydraulic accumulator is cylinder prepared by porous media material, and the pore-solids ratio of porous media material is 70 ~ 95%, and the effective aperture of porous media material increases from hydraulic accumulator bottom surface gradually to end face.
Further, the effective aperture of porous media material in hydraulic accumulator bottom surface is 19 ~ 21 μm, and porous media material is 1 ~ 2mm at the effective aperture of hydraulic accumulator end face.
Further, porous media material is foam metal, and foam metal is foam copper, foamed aluminium or titanium foam.
Further, hydraulic accumulator is made up of one deck foam metal;
Or hydraulic accumulator is made up of at least two-layer overlapping foam metal layer connected successively, and the effective aperture of foam metal layer increases from bottom to up according to the overlapping order of connection and is equal difference distribution.
Further, hydraulic accumulator is made up of three layers of foam metal layer.
The present invention provides a kind of selection method of above-mentioned hydraulic accumulator on the other hand, and hydraulic accumulator is installed in the tank of satellite, and selection method comprises the following steps:
1) store that liquid amasss according to the side direction peak acceleration of satellite, the axial peak acceleration of satellite, minimum requirement, pore-solids ratio and the satellite radius of the volume fraction determination hydraulic accumulator of propellant in hydraulic accumulator when being in side direction peak acceleration.
2) store that liquid amasss according to the side direction peak acceleration of satellite, the axial peak acceleration of satellite, minimum requirement, pore-solids ratio and the satellite height of the volume fraction determination hydraulic accumulator of propellant in hydraulic accumulator when being in side direction peak acceleration.
3) volume fraction, the step 1 of propellant in hydraulic accumulator when being in side direction peak acceleration according to the side direction peak acceleration of satellite, satellite) in the maximum equivalent aperture of the surface tension determination hydraulic accumulator of the radius of hydraulic accumulator, the density of propellant and propellant determined.
Or according to axial peak acceleration, the step 2 of satellite) in the maximum equivalent aperture of the surface tension determination hydraulic accumulator of the height of hydraulic accumulator, the density of propellant and propellant determined.
Further, step 1) in the determination of radius of hydraulic accumulator be specially:
In formula, a
side, a
axlebe respectively the side direction peak acceleration of satellite and the axial peak acceleration of satellite, n is satellite propellant volume fraction in hydraulic accumulator when being in side direction peak acceleration, and V is that minimum requirement stores liquid and amasss, and σ is propellant surface tension force, r
maxbe respectively hydraulic accumulator maximum diameter of hole and pore-solids ratio with φ, R is the radius of hydraulic accumulator.
Obtained by formula
Further, step 2) in the determination of height of hydraulic accumulator be specially:
Further, step 2) in the determination of hydraulic accumulator maximum diameter of hole be specially:
or
The present invention has following beneficial effect: hydraulic accumulator is cylinder prepared by porous media material, and the pore-solids ratio of porous media material is 70 ~ 95%, utilizes the surface tension of interstitial structure by Propellant Control at reservoir outlet place.And the effective aperture due to the hole of hydraulic accumulator bottom surface is less than the effective aperture of the hole of hydraulic accumulator end face, bubble in hole has the trend to the large direction motion of effective aperture, thus hydraulic accumulator can be entered by actv. obstruct bubble, thus at reservoir outlet place without the need to arranging screen cloth, thus to simplify the structure.Above-mentioned accumulator configuration is simple, is easy to manufacture, and without the need to arrange with the use of screen cloth, simplify the structure of tank.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the accumulator configuration schematic diagram of the preferred embodiment of the present invention;
Fig. 2 is another viewing angle constructions schematic diagram of hydraulic accumulator of the preferred embodiment of the present invention;
Fig. 3 is the foam metal ply connection structure schematic diagram of the preferred embodiment of the present invention;
Fig. 4 is that the hydraulic accumulator of the preferred embodiment of the present invention gets rid of bubble theory schematic diagram;
Fig. 5 is the selection method diagram of circuit of the hydraulic accumulator of the preferred embodiment of the present invention.
Description of reference numerals: 100, foam metal layer; 200, tank.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
See figures.1.and.2, the preferred embodiments of the present invention provide a kind of hydraulic accumulator, hydraulic accumulator is cylinder prepared by porous media material, and the pore-solids ratio of porous media material is 70 ~ 95%, and the effective aperture of porous media material increases from hydraulic accumulator bottom surface gradually to end face.
The hole homogeneity of the arbitrary radial section of hydraulic accumulator is good, all slightly floating in same pore diameter range.The effective aperture of hole increases from hydraulic accumulator bottom surface gradually to end face, and in hydraulic accumulator bottom surface on the direction of end face, multiple porosity communication forms the pipeline of similar taper.
As shown in Figure 4, an air bubble is clipped in taper pipe, is pushed into agent liquid around and wraps up, R in taper pipe
1>r, bubble and tube wall angle of contact are θ, θ >90 °, and wherein, P is bubble internal pressure, P
1for being under pressure on the left of bubble, P
2for being under pressure on the left of bubble, can be obtained by Young-Laplace equation, the surface tension on liquid-gas interface is respectively:
In formula, σ is propellant surface tension force.
In order to keep the balance of bubble, then:
As θ >90 °, time
Again, R
1>r, so work as P
1>P
2time, bubble is in state of equilibrium, and works as P
1=P
2time, bubble then can to left movement, namely large to aperture direction motion.In hydraulic accumulator, in the pipeline of similar taper, if there is bubble, the pressure of bubble both sides is equal, and the aperture of the hole of hydraulic accumulator end face is comparatively large, and therefore bubble can move to hydraulic accumulator end face direction.Under the effect of this trend, the bubble in propellant is not easy to enter from the hole of hydraulic accumulator end face, also automatically can discharge from end face direction, and can not discharge from hydraulic accumulator bottom surface, enter driving engine through tank 200 outlet even if enter.
In same hydraulic accumulator, pore-solids ratio is larger, and the effective aperture of the hole of hydraulic accumulator is less, and the difference of the hole of hydraulic accumulator end face and the effective aperture of bottom surface hole is larger, and bubble is more not easy to enter.Due to the restriction of processing technology, the pore-solids ratio of the hydraulic accumulator of general open texture can only reach 95%.
The present invention has following beneficial effect: hydraulic accumulator is cylinder prepared by porous media material, and the pore-solids ratio of hydraulic accumulator is 70 ~ 95%, utilizes the surface tension of interstitial structure by Propellant Control in tank 200 exit.And the effective aperture due to the hole of hydraulic accumulator bottom surface is less than the effective aperture of the hole of hydraulic accumulator end face, bubble in hole has the trend to the large direction motion of effective aperture, thus hydraulic accumulator can be entered by actv. obstruct bubble, thus in tank 200 exit without the need to arranging screen cloth, thus to simplify the structure.Above-mentioned accumulator configuration is simple, is easy to manufacture, and without the need to arrange with the use of screen cloth, simplify the structure of tank 200.
Alternatively, the effective aperture of porous media material in hydraulic accumulator bottom surface is 19 ~ 21 μm, and porous media material is 1 ~ 2mm at the effective aperture of hydraulic accumulator end face.The effective aperture of the hole of hydraulic accumulator bottom surface is 1 ~ 2 μm, is convenient to drilling processing, can meet preferably simultaneously and filter bubble, prevent bubble from entering tank 200 and export.
Alternatively, with reference to Fig. 3, porous media material is foam metal, and foam metal is foam copper, foamed aluminium or titanium foam.The proportion of foam metal material is little, the feature that specific surface area is large, and foam metal is designed to hydraulic accumulator, by the surface tension effects of the porous media material of foam metal by Propellant Control in tank 200 exit.And foam metal preparation technology is comparatively ripe, the material in different equivalent aperture can be prepared as required, and the pore homogeneity of hole is good.
Alternatively, with reference to Fig. 1 ~ 3, hydraulic accumulator is made up of one deck foam metal, or hydraulic accumulator is made up of at least two-layer overlapping foam metal layer 100 connected successively, and the effective aperture of foam metal layer 100 increases from bottom to up according to the overlapping order of connection and is equal difference distribution.
Foam metal is made up of one deck foam metal, and the effective aperture of its bottom surface is less, and the effective aperture of end face is comparatively large, and the foam metal of this kind of structure is processed comparatively not easily comparatively speaking.Hydraulic accumulator is made up of at least two-layer overlapping foam metal layer 100 connected successively, and the effective aperture of every one deck foam metal layer 100 is equal.Can by weld or by clamp between foam metal layer 100, as long as by fixing between foam metal layer 100.The effective aperture of foam metal layer 100 increases from bottom to up according to the overlapping order of connection, and effective aperture is between layers equal difference distribution, and make in hydraulic accumulator bottom surface on the direction of end face, multiple porosity communication forms the pipeline of similar taper.Gradient aperture design, automatically can discharge the bubble in hydraulic accumulator, avoid complicated structure design.This kind of design is easy to process, only need prepare the foam metal of multiple effective aperture specification according to conventional methods, more stacked from small to large according to the size of effective aperture, avoids processing different pore size on same foam metal, thus reduces difficulty of processing.
Alternatively, with reference to Fig. 1 ~ 3, hydraulic accumulator comprises three layers of foam metal layer 100.Experiment proves that arranging three layers of foam metal layer 100 can make the inner pipeline forming multiple similar taper preferably of hydraulic accumulator, discharges bubble, meets requirement of engineering.And the structure of the less hydraulic accumulator of the number of plies is simple, reduces technique and prepares difficulty.
The present invention provides a kind of selection method of above-mentioned hydraulic accumulator on the other hand, and with reference to Fig. 1 and Fig. 5, hydraulic accumulator is installed in the tank 200 of satellite, comprises the following steps:
S01: store that liquid amasss according to the side direction peak acceleration of satellite, the axial peak acceleration of satellite, minimum requirement, pore-solids ratio and the satellite radius of the volume fraction determination hydraulic accumulator of propellant in hydraulic accumulator when being in side direction peak acceleration.
S02: store that liquid amasss according to the side direction peak acceleration of satellite, the axial peak acceleration of satellite, minimum requirement, pore-solids ratio and the satellite height of the volume fraction determination hydraulic accumulator of propellant in hydraulic accumulator when being in side direction peak acceleration.
S03: the maximum equivalent aperture of the surface tension determination hydraulic accumulator of the radius of hydraulic accumulator, the density of propellant and the propellant determined in the volume fraction of propellant, step S01 in hydraulic accumulator when being in side direction peak acceleration according to the side direction peak acceleration of satellite, satellite
Or the maximum equivalent aperture of surface tension determination hydraulic accumulator according to the height of hydraulic accumulator, the density of propellant and the propellant determined in the axial peak acceleration of satellite, step S02.
The effective aperture r of the hole of bottom surface
mincan use screen cloth with reference to porous medium burning process and satellite, be generally 20 μm.
Above-mentioned hydraulic accumulator is specially adapted to microsatellite, and minimum requirement stores that liquid is long-pending to be determined by satellite task envelope, and pore-solids ratio is determined by selected porous media material, requires to be the bigger the better.Executing the task and model difference of each satellite, therefore needs to select suitable hydraulic accumulator according to actual needs, determines the parameter of hydraulic accumulator.
Alternatively, step 1) in the determination of radius of hydraulic accumulator be specially:
In formula, a
side, a
axlebe respectively the side direction peak acceleration of satellite and the axial peak acceleration of satellite, n is satellite propellant volume fraction in hydraulic accumulator when being in side direction peak acceleration, and V is that minimum requirement stores liquid and amasss, and σ is propellant surface tension force, r
maxbe respectively hydraulic accumulator maximum diameter of hole and pore-solids ratio with φ, R is the radius of hydraulic accumulator.Wherein require the lowest surface tension that propellant is suffered in porous medium
at least to equal to accelerate by satellite side direction the static pressure R ρ a that produces
sidewith the static pressure h ρ a that satellite axial acceleration produces
axle.
Obtained by formula (1)
Hydraulic accumulator is cylinder mechanism, and thus its volume can by π R
2h calculates, and propellant is filled in the hole of hydraulic accumulator, and thus minimum requirement stores liquid to amass V equal with the cumulative volume of the hole of hydraulic accumulator, is π R
2h φ.
Alternatively, step 2) in the determination of height of hydraulic accumulator be specially:
After determining the radius of hydraulic accumulator, can will obtain the height of hydraulic accumulator in recoverable for the radius of hydraulic accumulator (1).
Alternatively, step 2) in the determination of hydraulic accumulator maximum diameter of hole be specially:
or
After the radius determining hydraulic accumulator or height, can will obtain the height of hydraulic accumulator in the radius of hydraulic accumulator or highly recoverable (1).
The present invention has following beneficial effect: hydraulic accumulator is the cylinder with the mutually through pore configuration of multiple hole, and the pore-solids ratio of hydraulic accumulator is 70 ~ 95%, utilizes the surface tension of interstitial structure by Propellant Control in tank 200 exit.And the effective aperture due to the hole of hydraulic accumulator bottom surface is less than the effective aperture of the hole of hydraulic accumulator end face, bubble in hole has the trend to the large direction motion of effective aperture, thus hydraulic accumulator can be entered by actv. obstruct bubble, thus in tank 200 exit without the need to arranging screen cloth, thus to simplify the structure.Above-mentioned accumulator configuration is simple, is easy to manufacture, and without the need to arrange with the use of screen cloth, simplify the structure of tank 200.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a hydraulic accumulator, is characterized in that, described hydraulic accumulator is cylinder prepared by porous media material, and the pore-solids ratio of described porous media material is 70 ~ 95%, and the effective aperture of described porous media material increases from described hydraulic accumulator bottom surface gradually to end face.
2. hydraulic accumulator according to claim 1, is characterized in that, described porous media material is 19 ~ 21 μm at the effective aperture of described hydraulic accumulator bottom surface, and described porous media material is 1 ~ 2mm at the effective aperture of described hydraulic accumulator end face.
3. hydraulic accumulator according to claim 1, is characterized in that, described porous media material is foam metal, and described foam metal is foam copper, foamed aluminium or titanium foam.
4. hydraulic accumulator according to claim 3, is characterized in that, described hydraulic accumulator is made up of one deck foam metal;
Or described hydraulic accumulator is made up of at least two-layer overlapping foam metal layer (100) connected successively, and the effective aperture of described foam metal layer (100) increases from bottom to up according to the overlapping order of connection and is equal difference distribution.
5. hydraulic accumulator according to claim 4, is characterized in that, described hydraulic accumulator is made up of three layers of foam metal layer (100).
6. a selection method for the hydraulic accumulator according to any one of claim 1 to 5, is characterized in that, described hydraulic accumulator is installed in the tank (200) of satellite, and described selection method comprises the following steps:
1) store that liquid amasss according to the axial peak acceleration of the side direction peak acceleration of described satellite, described satellite, minimum requirement, described pore-solids ratio and described satellite when being in side direction peak acceleration in described hydraulic accumulator the volume fraction of propellant determine the radius of described hydraulic accumulator;
2) store that liquid amasss according to the axial peak acceleration of the side direction peak acceleration of described satellite, described satellite, described minimum requirement, described pore-solids ratio and described satellite when being in side direction peak acceleration in described hydraulic accumulator the volume fraction of propellant determine the height of described hydraulic accumulator;
3) volume fraction, the described step 1 of propellant in described hydraulic accumulator when being in side direction peak acceleration according to the side direction peak acceleration of described satellite, described satellite) in the surface tension of the radius of described hydraulic accumulator, the density of described propellant and described propellant determined determine the maximum equivalent aperture of described hydraulic accumulator
Or according to the axial peak acceleration of described satellite, described step 2) in the surface tension of the height of described hydraulic accumulator, the density of described propellant and described propellant determined determine the maximum equivalent aperture of described hydraulic accumulator.
7. selection method according to claim 6, is characterized in that, described step 1) described in the determination of radius of hydraulic accumulator be specially:
In formula, a
side, a
axlebe respectively the side direction peak acceleration of described satellite and the axial peak acceleration of described satellite, n is described satellite propellant volume fraction in described hydraulic accumulator when being in side direction peak acceleration, and V is that minimum requirement stores liquid and amasss, and σ is propellant surface tension force, r
maxbe respectively described hydraulic accumulator maximum diameter of hole and pore-solids ratio with φ, R is the radius of described hydraulic accumulator;
Obtained by formula (1)
8. selection method according to claim 7, is characterized in that, described step 2) described in the determination of height of hydraulic accumulator be specially:
9. selection method according to claim 7, is characterized in that, described step 2) described in the determination of hydraulic accumulator maximum diameter of hole be specially:
or
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