CN115387975A - Novel iodine working medium storage tank for electric propulsion - Google Patents
Novel iodine working medium storage tank for electric propulsion Download PDFInfo
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- CN115387975A CN115387975A CN202211050307.3A CN202211050307A CN115387975A CN 115387975 A CN115387975 A CN 115387975A CN 202211050307 A CN202211050307 A CN 202211050307A CN 115387975 A CN115387975 A CN 115387975A
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- tank body
- gas
- working medium
- storage tank
- electric propulsion
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- 229910052740 iodine Inorganic materials 0.000 title claims abstract description 52
- 239000011630 iodine Substances 0.000 title claims abstract description 52
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000010438 heat treatment Methods 0.000 claims abstract description 60
- 239000010410 layer Substances 0.000 claims abstract description 43
- 229920000181 Ethylene propylene rubber Polymers 0.000 claims abstract description 31
- 238000007789 sealing Methods 0.000 claims abstract description 21
- 239000011229 interlayer Substances 0.000 claims abstract description 9
- 239000000919 ceramic Substances 0.000 claims description 45
- 239000007787 solid Substances 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 8
- 229910000856 hastalloy Inorganic materials 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000005245 sintering Methods 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 2
- 239000012774 insulation material Substances 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 5
- 230000004044 response Effects 0.000 abstract description 4
- 238000000859 sublimation Methods 0.000 abstract description 3
- 230000008022 sublimation Effects 0.000 abstract description 3
- 238000004891 communication Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 43
- 238000009413 insulation Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 229910052724 xenon Inorganic materials 0.000 description 5
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000000151 deposition Methods 0.000 description 3
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H—PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H1/00—Using plasma to produce a reactive propulsive thrust
- F03H1/0006—Details applicable to different types of plasma thrusters
- F03H1/0012—Means for supplying the propellant
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/54—Large containers characterised by means facilitating filling or emptying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/74—Large containers having means for heating, cooling, aerating or other conditioning of contents
- B65D88/744—Large containers having means for heating, cooling, aerating or other conditioning of contents heating or cooling through the walls or internal parts of the container, e.g. circulation of fluid inside the walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H—PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H1/00—Using plasma to produce a reactive propulsive thrust
- F03H1/0006—Details applicable to different types of plasma thrusters
- F03H1/0018—Arrangements or adaptations of power supply systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H—PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H1/00—Using plasma to produce a reactive propulsive thrust
- F03H1/0006—Details applicable to different types of plasma thrusters
- F03H1/0031—Thermal management, heating or cooling parts of the thruster
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H—PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H1/00—Using plasma to produce a reactive propulsive thrust
- F03H1/0087—Electro-dynamic thrusters, e.g. pulsed plasma thrusters
Abstract
The invention discloses a novel iodine working medium storage tank for electric propulsion, which comprises a tank body, wherein the tank body is a hollow rotary hemisphere, the side wall of the tank body is formed by double-layer hemispherical thin walls, an interlayer cavity is formed between the inner thin wall and the outer thin wall of the tank body, an annular sealing plate is coaxially arranged at the tank opening of the tank body, the bottom surface of the sealing plate is respectively and integrally and fixedly connected with the upper end surfaces of the inner thin wall and the outer thin wall in a sealing way, and a first gas through hole and a second gas through hole are in sealing connection and communication through an inflation exhaust pipe; the ethylene propylene rubber elastic layer is coaxially and horizontally arranged at the top of the tank body, the lower end face of the outer edge of the ethylene propylene rubber elastic layer is attached to the upper surface of the sealing plate and fixed, and the middle part of the ethylene propylene rubber elastic layer is recessed downwards to a position close to the bottom of the tank body in a spherical surface manner; the grid net is coaxially and horizontally arranged on the ethylene propylene rubber elastic layer at the opening of the tank body. The invention solves the problem that the traditional piston is easy to block, and the storage tank has the advantages of reasonable overall structural design, uniform heating, stable sublimation, high response speed, high adjustment precision and high working efficiency.
Description
Technical Field
The application relates to the technical field of space electric propulsion technology and iodine working medium storage and supply systems, in particular to a novel iodine working medium storage tank for electric propulsion.
Background
Compared with the traditional satellite, the cubic satellite has the advantages of low cost, small volume, short development period, capability of formation and networking and the like, is rapidly developed in recent years, and becomes a hot research field for spacecraft design and application. The electric propulsion technology can generate tiny accurate impulse and high specific impulse, so that the load ratio of the satellite can be effectively improved, and the electric propulsion technology has a compact structure and light weight, and becomes the preferred technology of a cubic satellite propulsion system.
At present, the technical mature electric thruster mainly uses an ion thruster and a Hall thruster which use gaseous xenon as a working medium, but xenon has high acquisition difficulty and high price and needs to be stored in a pressurizing storage tank in a supercritical state, so iodine stored in a solid form becomes the best substitute working medium at present. On one hand, the sublimation temperature of the solid iodine working medium is lower, the design difficulty of a thermal system is lower, the pressure of a supply pipeline is lower, and the density is three times of that of xenon, namely, the storage tank with the same volume can enable the thruster to generate higher total impulse; on the other hand, the iodine is low in price, only accounts for 10% of xenon, but the discharge characteristic is basically consistent with that of xenon, and the iodine working medium can be stored in an unpressurized storage tank without transportation and storage problems.
However, the iodine working medium is strong in corrosivity and easy to condense, and has a larger optimization space in the aspects of material selection, structural design and the like of the storage tank. The currently commonly adopted spring piston type iodine working medium storage tank has the following defects: (1) Solid iodine working medium easily blocks the periphery of a piston baffle plate, so that the piston is blocked and the performance of the storage tank is reduced; (2) The temperature control system has lower heating efficiency, the interior is heated unevenly enough, and the channel is easy to condense and block. A solution is urgently needed.
Disclosure of Invention
Therefore, in order to solve the defects, the invention designs a novel iodine working medium storage tank for electric propulsion.
The technical scheme of the invention is as follows: a novel iodine working fluid storage tank for electric propulsion, comprising: the tank body is a hollow rotary hemisphere, the side wall of the tank body is formed by double layers of hemispherical thin walls, an interlayer cavity is formed between the inner thin wall and the outer thin wall of the tank body, a circular ring-shaped sealing plate is coaxially arranged at the tank opening of the tank body, the bottom surface of the sealing plate is respectively and integrally and fixedly connected with the upper end surfaces of the inner thin wall and the outer thin wall in a sealing manner, a first gas through hole is formed in the bottom of the inner thin wall, a second gas through hole is formed in the bottom of the outer thin wall, and the first gas through hole and the second gas through hole are in sealing connection and communication through an inflation and exhaust pipe; the tank body is characterized by further comprising an ethylene propylene rubber elastic layer, the ethylene propylene rubber elastic layer is coaxially and horizontally arranged at the top of the tank body, the lower end face of the outer edge of the ethylene propylene rubber elastic layer is attached to the upper surface of the sealing plate to be fixed, and the middle of the ethylene propylene rubber elastic layer is recessed downwards to a position close to the bottom of the tank body in a spherical shape; the grid net is circular, the grid net is coaxially and horizontally arranged on the ethylene propylene rubber elastic layer at the opening of the tank body, the outer edge of the grid net is lapped on the upper end face of the sealing plate and fixed, and the middle part of the grid net is recessed downwards to the inside of the opening of the tank body in a plane shape; the ceramic heating plate is a circular thin sheet, and is coaxially arranged on the grid net and fixed; the ceramic heating plate is characterized by further comprising a flange end cover, the flange end cover is coaxially arranged on the ceramic heating plate, a vertically arranged air outlet pipe is arranged in the middle of the flange end cover, and the lower end of the air outlet pipe is communicated with the inside of the tank body through a through hole formed in the middle of the flange end cover.
In the technical scheme, the tank body is arranged in a vacuum test chamber, the rear end in the vacuum test chamber is provided with the thruster and the hollow cathode, the thruster is connected and communicated with the air outlet pipe through the first gas conveying pipeline, and the hollow cathode is connected and communicated with the air outlet pipe through the second gas conveying pipeline.
In the technical scheme, the inner surface of the inner thin wall is provided with a heat insulation coating.
In the technical scheme, the lower end of the inflation exhaust tube is communicated with one end of the gas pipeline.
In the technical scheme, the flange end cover is provided with the pressure detection port, and the pressure detection port is provided with the pressure sensor.
In the technical scheme, the air outlet pipe and the air pipeline are provided with electromagnetic valves; the gas conveying pipeline I and the gas conveying pipeline II are both provided with a proportional control valve; and the first gas conveying pipeline and the second gas conveying pipeline are both provided with pressure sensors.
In the technical scheme, the gas outlet pipe is filled with a porous ceramic filter element; a solid iodine storage layer is arranged on the concave surface of the ethylene propylene rubber elastic layer; and an iodine steam layer is arranged on the concave surface of the grid mesh.
Among the above-mentioned technical scheme, gas transmission pipeline one, gas transmission pipeline two outer walls parcel flexible heating jacket, the external portion of jar is equipped with control system, solenoid valve, pressure sensor, proportion regulating valve are controlled by control system, and control system adjusts the solenoid valve according to the flow demand according to the power that generates heat of pressure sensor's atmospheric pressure value control annular ceramic heating plate to the realization is to the accurate control of flow.
In the technical scheme, the set temperature of the flexible heating sleeve is 15-25 ℃ higher than that of the ceramic heating sheet.
In the above technical solution, preferably, the tank body is made of 316L stainless steel or C276 hastelloy, the interlayer cavity is in a vacuum state or filled with a heat insulating material, the grid mesh and the gas transmission pipeline are made of C276 hastelloy, the porous ceramic filter element is formed by sintering ceramic fibers at a high temperature, and the filtering precision is less than 16 μm.
The technical scheme of the invention has the following advantages:
the invention provides a novel iodine working medium storage tank for electric propulsion, which can effectively solve the problem that solid iodine blocks a piston by replacing the traditional spring piston structure with an ethylene propylene rubber elastic layer; the solid iodine is heated in a non-contact way through the annular ceramic heating sheet, so that the solid iodine is heated more uniformly and the flow is more stable; the power of the heating sheet can be accurately adjusted by monitoring the outlet pressure through the control system, and the electromagnetic valve and the proportional regulating valve are continuously adjusted at the same time, so that the accurate control of the flow is realized; the storage tank has reasonable integral structure, short response time of the heating sheet and high flow control precision, and greatly improves the working efficiency of the electric propulsion storage and supply system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of the overall structure of embodiment 1 of the present invention.
FIG. 2 is a schematic view showing a cycle relationship between an iodine working medium storage tank and a test system in embodiment 1 of the present invention.
Description of reference numerals:
1-tank body, 2-interlayer cavity, 3-heat insulation coating, 4-ethylene propylene rubber elastic layer, 5-grid net, 6-iodine steam layer, 7-solid iodine storage layer, 8-flange end cover, 9-porous ceramic filter core, 10-pressure sensor, 11-ceramic heating sheet, 12-electromagnetic valve, 13-proportion regulating valve, 14-flexible heating jacket, 15-gas conveying pipeline II, 16-control system, 17-vacuum test chamber, 18-thruster, 19-hollow cathode, 20-inflation exhaust pipe, 21-gas outlet pipe, 22-pressure detection port, 23-gas conveying pipeline I, 24-gas pipeline and C-control system.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1:
referring to fig. 1-2, a novel iodine working medium storage tank for electric propulsion comprises: the tank comprises a tank body 1, wherein the tank body 1 is a hollow rotary hemisphere, the side wall of the tank body 1 is formed by double-layer hemispherical thin walls, an interlayer cavity 2 is formed between the inner thin wall and the outer thin wall of the tank body 1, a circular ring-shaped sealing plate is coaxially arranged at the tank opening of the tank body 1, the bottom surface of the sealing plate is respectively and fixedly connected with the upper end surfaces of the inner thin wall and the outer thin wall in an integrated and sealed manner, a first gas through hole is formed in the bottom of the inner thin wall, a second gas through hole is formed in the bottom of the outer thin wall, and the first gas through hole and the second gas through hole are communicated in a sealed manner through a gas filling and pumping pipe 20; the tank comprises a tank body 1 and is characterized by further comprising an ethylene propylene rubber elastic layer 4, wherein the ethylene propylene rubber elastic layer 4 is coaxially and horizontally arranged at the top of the tank body 1, the lower end face of the outer edge of the ethylene propylene rubber elastic layer 4 is fixed to be attached to the upper surface of the sealing plate, and the middle of the ethylene propylene rubber elastic layer 4 is concave downwards to a position close to the bottom of the tank body 1 in a spherical manner; the tank body is characterized by further comprising a grid net 5, wherein the grid net 5 is circular, the grid net 5 is coaxially and horizontally arranged on the ethylene propylene rubber elastic layer 4 of the opening of the tank body 1, the outer edge of the grid net 5 is lapped on the upper end face of the sealing plate to be fixed, and the middle part of the grid net 5 is recessed into the opening of the tank body 1 in a plane manner; the heating device further comprises a ceramic heating sheet 11, wherein the ceramic heating sheet 11 is a circular ring-shaped sheet, and the ceramic heating sheet 11 is coaxially arranged on the grid net 5 and fixed; the ceramic heating tank is characterized by further comprising a flange end cover 8, wherein the flange end cover 8 is coaxially arranged on the ceramic heating sheet 11, a vertically arranged air outlet pipe is arranged in the middle of the flange end cover 8, and the lower end of the air outlet pipe is communicated with the interior of the tank body 1 through a through hole formed in the middle of the flange end cover 8.
In the above embodiment, specifically, the tank 1 is disposed in a vacuum test chamber 17, a thruster 18 and a hollow cathode 19 are disposed at the rear end of the vacuum test chamber 17, the thruster 18 is connected and communicated with the air outlet pipe 21 through a first gas conveying pipeline 23 for supplying air, and the hollow cathode 19 is connected and communicated with the air outlet pipe 21 through a second gas conveying pipeline 15.
In the above embodiment, preferably, the inner surface of the inner thin wall is provided with a thermal insulation coating 3.
In the above embodiment, specifically, the lower end of the gas pumping tube 20 is connected and communicated with one end of the gas pipeline 24.
In the above embodiment, the flange end cover 8 is provided with the pressure detection port 22, and the pressure detection port 22 is provided with the pressure sensor 10.
In the above embodiment, the electromagnetic valve 12 is arranged on the air outlet pipe 21 and the air pipeline 24; the gas conveying pipeline I23 and the gas conveying pipeline II 15 are both provided with a proportional control valve 13; and the first gas conveying pipeline 23 and the second gas conveying pipeline 15 are both provided with a pressure sensor 10.
In the above embodiment, the outlet pipe 21 is filled with the porous ceramic filter element 9; a solid iodine storage layer 7 is arranged on the concave surface of the ethylene propylene rubber elastic layer 4; an iodine steam layer 6 is arranged on the concave surface of the grid mesh 5.
In the above embodiment, the outer walls of the first gas conveying pipeline 23 and the second gas conveying pipeline 15 are wrapped by the flexible heating jacket 14, the control system 16 is arranged outside the tank body 1, the electromagnetic valve 12, the pressure sensor 10 and the proportional control valve 13 are controlled by the control system 16, the control system 16 controls the heating power of the annular ceramic heating sheet 11 according to the air pressure value of the pressure sensor 10, and the electromagnetic valve 12 is adjusted according to the flow demand, so that the flow is accurately controlled.
In the above embodiment, the temperature of the flexible heating jacket 14 is 15-25 deg.c higher than the ceramic heating sheet 11, preferably 20 deg.c.
In the above embodiment, preferably, the material of the tank body 1 is 316L stainless steel or C276 hastelloy, the interlayer cavity 2 is in a vacuum state or filled with a heat insulating material, the material of the grid mesh 5 and the gas conveying pipeline two 15 is C276 hastelloy, the porous ceramic filter element 9 is formed by sintering ceramic fibers at a high temperature, and the filtering precision is less than 16 μm.
In the above embodiment, specifically, the interlayer cavity 2 of the tank body 1 is in a vacuum state or filled with a heat insulation material, so as to play a role in heat insulation or reduce heat leakage of the storage tank; the inner surface is provided with a heat insulation coating 3, so that the heat insulation effect of the storage tank is further enhanced.
The traditional spring piston can be replaced by the self tension of the ethylene propylene rubber elastic layer 4, and meanwhile, the ethylene propylene rubber material also has an anti-corrosion effect.
In the above embodiment, it can be understood that the ceramic heating sheet 11 has an insulated surface, and has the characteristics of fast temperature rise, short response time, long service life, customizable size and shape, and the like.
In the above embodiment, in particular, the grid mesh 5 has a large number of arrayed micropores, so that on one hand, large solid iodine particles can be blocked, and on the other hand, the flow resistance can be increased, so that the flow rate is more stable.
In the above embodiment, the outer wall of the gas pipeline is wrapped with the flexible heating jacket 14 to prevent iodine vapor from condensing and blocking the pipeline; a porous ceramic filter element 9 is arranged in the gas outlet 21, the porous ceramic filter element 9 is formed by sintering ceramic fibers at a high temperature, the filtering precision is less than 16 mu m, and large-particle solid iodine can be prevented from entering a pipeline to cause blockage; the control system 16 controls the heating power of the annular ceramic heating plate 11 according to the air pressure value of the pressure sensor 10, so as to accurately control the temperature, and simultaneously adjusts the electromagnetic valve 12 and the proportion adjusting valve 13 according to the requirements, so as to accurately control the flow, and if necessary, a proper amount of high-temperature nitrogen can be injected through the air inflation and extraction pipe 20 for auxiliary control.
When the storage tank provided by the embodiment is used, the thermal insulation coating 3 is uniformly paved on the inner surface of the tank body and the lower surface of the flange end cover 8, and then the upper part and the lower part of the tank body are assembled. The assembly sequence of the upper part of the tank body is that a porous ceramic filter element 9 is filled in an air outlet pipe 21 on the upper side of a flange end cover 8, a pressure sensor 10 is installed at a pressure detection port 22, and an annular ceramic heating sheet 11 and a grid net 5 are sequentially fixed on the lower surface of the flange end cover 8 from top to bottom; the lower part of the tank body is provided with an ethylene propylene rubber elastic layer 4 which is fixedly connected with the edge of the upper side of the tank body, so that the tank body is assembled. Before the operation, the air-filling exhaust pipe 20 is exhausted, the ethylene propylene rubber elastic layer is naturally sunk due to the action of pressure difference, then the upper space of the ethylene propylene rubber elastic layer is filled with the coarse ground powder solid iodine, and then the upper part and the lower part of the tank body are fastened around the flange end cover 8 by using bolts, so that the injection of the iodine working medium in the tank body is completed. As shown in fig. 2, the electromagnetic valve 12, the proportional control valve 13, the gas pipeline 15 wrapped with the flexible heating jacket 14, the thruster 18 in the vacuum test chamber 17 and the hollow cathode 19 are connected in sequence. Meanwhile, the pressure sensor 10, the electromagnetic valve 12, the proportion regulating valve 13 and the annular ceramic heating sheet 11 are connected with the control system 16, the air inflation exhaust tube 20 is connected with the nitrogen cylinder through the electromagnetic valve 12, the preparation work of the test is completed, and the novel iodine working medium storage tank for electric propulsion can work normally after the power supply is turned on.
The temperature control of the control system 16 during the test is divided into three phases: (1) Heating the annular ceramic heating plate 11 and the flexible heating sleeve 14 to a required temperature before the thruster is ignited; (2) When the thruster runs, the temperature of each unit is kept stable to ensure normal work; (3) After the thruster is finished working, the annular ceramic heating sheet 11 is closed, and the flexible heating sleeve 14 is closed after the iodine vapor in the gas conveying pipeline II 15 is deposited into the cooled storage tank, so that the blockage caused by the deposition of iodine formed in the pipeline and the valve is avoided.
In this embodiment, the control mode of the control system 16 is PID control, and the heating power of the annular ceramic heating plate 11 can be adjusted according to the corresponding relationship between the saturated vapor pressure P of the iodine vapor (i.e. the pressure P in the tank monitored by the pressure sensor 10) and the temperature T, so as to accurately adjust the temperature in the tank, where the relationship is described by formula (1), and the temperature of the second gas transmission pipeline 15 wrapped by the flexible heating jacket 14 is required to be 15-25 ℃ higher than the temperature of the annular ceramic heating plate 11; the control system 16 controls the on-off of the flow through the electromagnetic valve 12, the flow is accurately regulated and controlled through the proportional control valve 13, the iodine vapor in the gas conveying pipeline II 15 is a fully developed incompressible laminar flow, and the pressure change before and after the proportional control valve 13 can be described by an equation (2) which is in a direct proportion relation with the mass flow.
In which the pressure P is given in bar and the temperature T is given in K.
In the formula P 1 And P 2 The line pressure (unit is Pa) before and after the proportional control valve 13, R, L is the line radius and line length, μ is the iodine vapor viscosity (usually 0.6), M is the iodine molar mass, T is the gas temperature, γ is the correction factor, k is the shape factor, and C is a constant. The constant C can be measured by measuring the vapor pressure of the storage tank and the pressure at the outlet of the pipeline, so that the control relation between the input signal and the flow in the control system is determined, and more stable and accurate flow regulation is realized.
Furthermore, the ethylene propylene rubber elastic layer 4 has the characteristics of high temperature resistance and corrosion resistance, and preferably, an anti-corrosion layer can be additionally arranged on the surface of the ethylene propylene rubber elastic layer, so that the effects of corrosion resistance and deposition resistance are better; the grid mesh 5 and the second gas conveying pipeline 15 are directly contacted with iodine steam, preferably C276 hastelloy, the pipeline size is a 1/8 inch standard pipe, and the tank body is not directly contacted with iodine, preferably 316L stainless steel; the non-uniform temperature of the storage tank can cause unstable flow, and in order to prevent the iodine working medium from depositing and realize accurate control sublimation, the annular ceramic heating sheet 11 is adopted to carry out non-contact heating on the solid iodine, the heating mode mainly adopts radiation heat exchange, the heating is more uniform, the heating structure is simple, the efficiency is high, the stability is high, the response speed of the ceramic heating sheet is high, and the temperature regulation delay time can be ignored; the electromagnetic valve is low in power to prevent heat accumulation, and a high-temperature-resistant and corrosion-resistant DJ2BV-UM4 corrosion-resistant normally closed electromagnetic stop valve is preferably adopted, and a 1/8 inch standard VCR joint is adopted at two ends.
Through the detailed description of the specific embodiments of the present invention, the present invention has the following advantageous effects or advantages:
(1) Compared with the traditional external heating, the internal non-contact heating mode of the annular ceramic heating sheet 11 does not need the heat conduction of the tank body, can reduce the influence of the thermal inertia of the tank body, is heated more uniformly and has better regulating capability, thereby realizing the rapid and stable regulation of the temperature to the flow;
(2) The ethylene propylene rubber elastic layer 4 replaces the traditional spring piston structure, so that the problem that the piston is blocked by solid iodine can be effectively solved;
(3) The control system 16 can accurately adjust the power of the heating sheet according to the monitoring of the outlet pressure, and simultaneously continuously adjust the electromagnetic valve 12 and the proportional regulating valve 13, thereby realizing the accurate control of the flow; if necessary, the internal pressure can be increased by injecting nitrogen through the air inflation exhaust pipe 20 so as to increase the mass flow in the pipeline; the system has high flow control precision, and greatly improves the working efficiency of the electric propulsion storage and supply system
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A novel iodine working medium storage tank for electric propulsion, characterized by comprising:
the tank body (1) is a hollow rotary hemisphere, the side wall of the tank body (1) is composed of double-layer hemispherical thin walls, an interlayer cavity (2) is formed between the inner thin wall and the outer thin wall of the tank body (1), a circular sealing plate is coaxially arranged at the tank opening of the tank body (1), the bottom surface of the sealing plate is respectively and integrally and fixedly connected with the upper end surfaces of the inner thin wall and the outer thin wall in a sealing manner, a first gas through hole is formed in the bottom of the inner thin wall, a second gas through hole is formed in the bottom of the outer thin wall, and the first gas through hole and the second gas through hole are communicated in a sealing manner through an inflation exhaust pipe (20);
the ethylene propylene rubber elastic layer (4) is coaxially and horizontally arranged at the top of the tank body (1), the lower end face of the outer edge of the ethylene propylene rubber elastic layer (4) is attached to the upper surface of the sealing plate for fixing, and the middle part of the ethylene propylene rubber elastic layer (4) is concave downwards to a position close to the bottom of the tank body (1) in a spherical shape;
the grid net (5) is circular, the grid net (5) is coaxially and horizontally arranged on the ethylene propylene rubber elastic layer (4) at the opening of the tank body (1), the outer edge of the grid net (5) is lapped on the upper end face of the sealing plate and fixed, and the middle part of the grid net (5) is recessed into the opening of the tank body (1) in a plane manner;
the ceramic heating sheet (11) is a circular ring-shaped sheet, and the ceramic heating sheet (11) is coaxially arranged on the grid net (5) and fixed;
the ceramic heating tank is characterized by comprising a flange end cover (8), wherein the flange end cover (8) is coaxially arranged on the ceramic heating sheet (11), a vertically arranged air outlet pipe is arranged in the middle of the flange end cover (8), and the lower end of the air outlet pipe is communicated with the inside of the tank body (1) through a through hole formed in the middle of the flange end cover (8).
2. The novel iodine working medium storage tank for electric propulsion as claimed in claim 1, wherein said tank body (1) is arranged in a vacuum test chamber (17), a thruster (18) and a hollow cathode (19) are arranged at the rear end of the vacuum test chamber (17), said thruster (18) is connected and communicated with said air outlet pipe (21) through a first gas transmission pipeline (23), and said hollow cathode (19) is connected and communicated with said air outlet pipe (21) through a second gas transmission pipeline (15).
3. The new iodine working medium storage tank for electric propulsion according to claim 1, characterised in that said inner thin-walled inner surface is provided with a thermal insulating coating (3).
4. The novel iodine working medium storage tank for electric propulsion as claimed in claim 1, wherein the lower end of said air inflation and extraction pipe (20) is connected and communicated with one end of said gas pipeline (24).
5. The novel iodine working medium storage tank for electric propulsion as claimed in claim 1, wherein said flange end cover (8) is provided with a pressure detection port (22), and said pressure detection port (22) is provided with a pressure sensor (10).
6. The novel iodine working medium storage tank for electric propulsion as claimed in claim 2, wherein electromagnetic valves (12) are arranged on the air outlet pipe (21) and the air pipeline (24); the gas conveying pipeline I (23) and the gas conveying pipeline II (15) are both provided with a proportional regulating valve (13); and the first gas conveying pipeline (23) and the second gas conveying pipeline (15) are respectively provided with a pressure sensor (10).
7. The novel iodine working medium storage tank for electric propulsion as claimed in claim 6, characterized in that said air outlet pipe (21) is internally filled with a porous ceramic filter element (9); a solid iodine storage layer (7) is arranged on the concave surface of the ethylene propylene rubber elastic layer (4); an iodine steam layer (6) is arranged on the concave surface of the grid mesh (5).
8. The novel iodine working medium storage tank for electric propulsion as claimed in claim 2, wherein the outer walls of the first gas conveying pipeline (23) and the second gas conveying pipeline (15) are wrapped by a flexible heating jacket (14), a control system (16) is arranged outside the tank body (1), the electromagnetic valve (12), the pressure sensor (10) and the proportion regulating valve (13) are controlled by the control system (16), the control system (16) controls the heating power of the annular ceramic heating plate (11) according to the air pressure value of the pressure sensor (10), and the electromagnetic valve (12) is regulated according to the flow demand so as to realize accurate control of the flow.
9. The novel iodine working medium storage tank for electric propulsion as claimed in claim 8, characterized in that the temperature setting of said flexible heating jacket (14) is 15-25 ℃ higher than that of the ceramic heating plate (11).
10. The novel iodine working medium storage tank for electric propulsion as claimed in claim 1, wherein the tank body (1) is made of 316L stainless steel or C276 Hastelloy, the interlayer cavity (2) is in a vacuum state or filled with a heat insulation material, the grid mesh (5) and the gas delivery pipe II (15) are made of C276 Hastelloy, the porous ceramic filter element (9) is formed by high-temperature sintering of ceramic fibers, and the filtering precision is less than 16 μm.
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Cited By (1)
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| CN116146443A (en) * | 2022-12-01 | 2023-05-23 | 兰州空间技术物理研究所 | Low-pressure discharge breakdown suppression assembly of high-power Hall thruster |
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