Solid iodine working medium liquefying and crystallizing device

Abstract

The invention provides a solid iodine working medium liquefying and crystallizing device which comprises a solid iodine liquefying container used for providing a dry environment for placing solid iodine particles; the circular-truncated-cone-shaped separating device is arranged in the solid iodine liquefying container and divides the solid iodine liquefying container into a solid iodine particle placing area and a bottom liquefying area; two ends of the connecting pipeline are respectively connected with the bottom liquefaction area and the iodine crystallization storage tank; the heating assembly is arranged on the outer walls of the solid iodine liquefying container and the connecting pipeline and is used for providing liquefying temperature of the solid iodine particles; the piston assembly is mounted at the top of the solid iodine liquefaction container; and the nitrogen purging device is communicated with the iodine crystal storage tank and is used for replacing impurity gas in the iodine crystal storage tank. According to the implementation mode, the solid iodine particles with the density of 2.5 g / cm < 3 > are liquefied and solidified to form the iodine crystals with the density of 4.93 g / cm < 3 >, and the filling density is improved, so that more fuel can be stored to be supplied to an electric thrust system for use, and the solid electric thrust system is of great significance to rapid development of the solid electric thrust system.

Description

Technical Field

[0001] The invention relates to the technical field of aerospace electric propulsion, and in particular to a solid iodine working medium liquefaction crystallization device. Background Art

[0002] With the rapid development of aerospace technology, the requirements of space missions for spacecraft propulsion systems are becoming more and more diverse. Commercial satellites require space propulsion systems with low cost and high cost performance to improve market competitiveness. In order to meet the needs of space missions from different fields such as military, commercial, and scientific research, space propulsion technology has been continuously developing and improving.

[0003] Conventional rockets use chemical reactions to achieve propulsion. In contrast, electric thrusters rely on electricity to accelerate propellants such as charged ions out of the spacecraft to generate thrust. Since electric thrusters only need to carry very little propellant, they are very efficient in generating thrust. At present, electric propulsion technology has entered the stage of full application internationally. Driven by the growing demand for space missions, various new types of electric propulsion have emerged at home and abroad, promoting the proposal and realization of new space missions that are difficult or even impossible to complete with traditional chemical propulsion.

[0004] There is a new electric micro-propulsion technology system. Its solution is to adopt the solid iodine working fluid route without reducing the specific impulse. It has the advantages of high-density propellant storage, low system cost and low dry weight. At present, both domestic and foreign countries have been competing to carry out research on solid iodine working fluid electric propulsion technology.

[0005] However, due to the solid iodine particles, the vibrations during launch and the spacecraft's orbital motion can cause the solid iodine to break apart, which may damage the propulsion system and cause other problems. Summary of the invention

[0006] The content of the present invention is used to introduce the concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of the present disclosure is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0007] Some embodiments of the present invention provide a solid iodine working medium liquefaction crystallization device to solve the technical problems mentioned in the above background technology section.

[0008] The solid iodine working medium liquefaction crystallization device comprises:

[0009] A solid iodine liquefaction container, used to provide a dry environment for placing solid iodine particles;

[0010] A truncated cone-shaped separation device is arranged in the solid iodine liquefaction container to divide the solid iodine liquefaction container into a solid iodine particle placement area and a bottom liquefaction area;

[0011] A connecting pipeline and an iodine crystal storage tank, wherein two ends of the connecting pipeline are respectively connected to the bottom liquefaction zone and the iodine crystal storage tank, and the iodine crystal storage tank is used to receive liquid iodine and form iodine crystals;

[0012] A heating component is provided to the solid iodine liquefaction container and the outer wall of the connecting pipeline to provide a liquefaction temperature for the solid iodine particles;

[0013] A piston assembly is mounted on the top of the solid iodine liquefaction container and is used to push the liquid iodine into the iodine crystal storage tank;

[0014] The nitrogen purge device is connected to the iodine crystal storage tank and is used to replace the impurity gas in the iodine crystal storage tank before the liquid iodine enters the iodine crystal storage tank.

[0015] Optionally, the cross-section of the truncated cone-shaped separation device is trapezoidal, and the diameter of the truncated cone-shaped separation device gradually decreases from top to bottom.

[0016] Optionally, a separation net is fixedly provided at the bottom of the truncated cone-shaped separation device, and the specification of the separation net is on the order of ≤10um.

[0017] Optionally, a first valve is provided on the connecting pipeline for opening or closing the connecting pipeline.

[0018] Optionally, the heating assembly includes a flexible heating sheet, a power supply circuit connected to the flexible heating sheet, and a temperature measurement circuit.

[0019] Optionally, the flexible heating sheet is arranged on the outer wall and the bottom end of the solid iodine liquefaction container and the outer wall of the connecting pipeline.

[0020] Optionally, the flexible heating sheet is made of polyimide.

[0021] Optionally, the piston assembly includes a flange, a piston, a piston rod and multiple springs. The flange and the piston are connected by multiple springs, and the piston rod passes through the flange and is fixedly connected to the piston. In the assembled state, the flange is sealed to the top of the solid iodine liquefaction container, and the piston extends into the interior of the solid iodine liquefaction container.

[0022] Optionally, the nitrogen purging device includes an air inlet pipe and an air outlet pipe connected to the iodine crystal storage tank, the air inlet pipe is connected to the nitrogen bottle, and a second valve is provided on the air inlet pipe and the air outlet pipe for controlling the on and off of the nitrogen.

[0023] Optionally, the solid iodine liquefaction container, the truncated cone separation device, the connecting pipeline and the iodine crystal storage tank are made of 316L stainless steel.

[0024] The above-mentioned embodiment of the present invention has the following beneficial effects: through the solid iodine working medium liquefaction crystallization device of the present invention, the density of 2.5g / cm 3 The solid iodine particles liquefy and solidify to form a density of 4.93g / cm 3 The iodine crystals can increase the packing density, thereby being able to store more fuel for the electric propulsion system, which is of great significance to the rapid development of the solid electric propulsion system.

[0025] Specifically, the truncated cone type separation device divides the solid iodine liquefaction container into a solid iodine particle placement area and a bottom liquefaction area, which can prevent the solid iodine particles from directly entering the bottom liquefaction area. Under the action of the heating component, the solid iodine particles placed in the solid iodine particle placement area are liquefied and enter the bottom liquefaction area.

[0026] Under the action of the piston assembly, liquid iodine is pushed from the connecting pipeline into the iodine crystal storage tank. After condensation and crystallization, iodine crystals are finally formed.

[0027] In addition, before the liquid iodine enters the iodine crystal storage tank, the impurity gas in the iodine crystal storage tank can be replaced by a nitrogen purge device, so that the iodine crystal storage tank is filled with nitrogen to prevent the impurity gas from affecting the purity of the iodine crystals. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a structural schematic diagram of an embodiment of a solid iodine working medium liquefaction crystallization device of the present invention;

[0030] Figure 2 is a cross-sectional view of an embodiment of a truncated cone type separation device of the present invention;

[0031] Figure 3 It is a top view of an embodiment of the truncated cone type separation device of the present invention.

[0032] Description of reference numerals:

[0033] 1. Flexible heating plate; 2. Solid iodine particles; 31. Piston; 32. Piston rod; 33. Spring; 34. Flange; 4. Cone-shaped separation device; 41. Separation net; 5. Liquid iodine; 6. Connecting pipeline; 7. First valve; 8. Second valve; 9. Iodine crystal storage tank; 10. Solid iodine liquefaction container; 11. Nitrogen cylinder. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0038] First see Figure 1 , Figure 1 FIG. 1 is a schematic diagram of the structure of an embodiment of a solid iodine working medium liquefaction crystallization device of the present invention. Figure 1As shown, the solid iodine working medium liquefaction crystallization device includes a solid iodine liquefaction container 10, which serves as a storage container for solid iodine particles 2. The solid iodine liquefaction container 10 can be a cylindrical structure, and can be made of a material that does not react with the solid iodine particles 2, such as 316L stainless steel, etc., and those skilled in the art can choose according to actual conditions. It should be noted that before placing the solid iodine particles 2, the solid iodine liquefaction container 10 should be purged with dry gas so that it can provide a dry environment.

[0039] See also Figure 2 and Figure 3 , Figure 2 is a cross-sectional view of an embodiment of a truncated cone type separation device of the present invention; Figure 3 FIG. 2 is a top view of an embodiment of a truncated cone type separation device of the present invention. Figures 1 to 3 As shown, a truncated cone type separator 4 is welded in the solid iodine liquefaction container 10 to separate the solid iodine liquefaction container 10 into a solid iodine particle placement area and a bottom liquefaction area. The truncated cone type separator 4 can be placed at 1 / 3 of the height of the solid iodine liquefaction container 10. Of course, those skilled in the art can also adjust it according to actual conditions.

[0040] The cross section of the truncated cone type separation device 4 is trapezoidal, and the diameter from top to bottom ( Figure 1 The direction in the middle) gradually becomes smaller. Can be made of materials that do not react with the solid iodine particles 2, such as 316L stainless steel. A separation net 41 is welded at the bottom of the truncated cone type separation device 4, and the separation net 41 is used as a filter to prevent the solid iodine particles 2 from directly falling into the bottom liquefaction zone of the solid iodine liquefaction container 10, and the specification of the separation net 41 is ≤10um magnitude.

[0041] Re-read Figure 1 , the device also includes a connecting pipeline 6 and an iodine crystal storage tank 9. The two ends of the above-mentioned connecting pipeline 6 are communicated with the bottom liquefaction zone and the iodine crystal storage tank 9 respectively. A first valve 7 is provided on the connecting pipeline 6, which is used as an on-off valve to control the liquid iodine 5 to flow into the iodine crystal storage tank 9. The above-mentioned connecting pipeline 6 and the iodine crystal storage tank 9 can be made of materials that do not react with liquid iodine, such as 316L stainless steel, Hastelloy, etc., and those skilled in the art can select according to actual conditions. The shape of the above-mentioned iodine crystal storage tank 9 is not limited, and can be a cylinder, a cuboid, a sphere or other shapes. Those skilled in the art can make adjustments.

[0042] The solid iodine working medium liquefaction crystallization device also includes a heating assembly, including a flexible heating sheet 1 pasted to the outer wall and bottom end of the solid iodine liquefaction container 10 and the connecting pipeline 6, and the flexible heating sheet 1 is used as a heating device. It can be known from the phase diagram of iodine that the liquefaction temperature of solid iodine must be higher than 114.5°C, and the pressure must be higher than the corresponding vapor pressure to observe liquid iodine 5 (generally the pressure is higher than 89.8mmHg). Therefore, heat can be provided by the flexible heating sheet 1, so that the solid iodine liquefaction container 10 is maintained at 114.5°C, and the connecting pipeline 6 is maintained at 125°C. The above-mentioned flexible heating sheet 1 can be connected to the power supply circuit and the temperature measurement circuit. As an example, the flexible heating sheet 1 can be made of polyimide.

[0043] In order to enable liquid iodine 5 to enter iodine crystal storage tank 9 through connecting pipeline 6, the upper end of above-mentioned solid iodine liquefaction container 10 is also provided with piston assembly, is used to promote liquid iodine 5 to enter iodine crystal storage tank 9.Specifically, this piston assembly comprises flange 34, piston 31, piston rod 32 and a plurality of springs 33.Be connected by a plurality of springs 33 between above-mentioned flange 34 and piston 31, piston rod 32 passes flange 34 and is fixedly connected with piston 31.Under assembled state, flange 34 is sealed to solid iodine liquefaction container 10 tops, and piston 31 extends into solid iodine liquefaction container 10 insides.Above-mentioned piston 31 can adopt 316L stainless steel to make.

[0044] After above-mentioned flexible heating sheet 1 is heated, solid iodine particles 2 form liquid iodine 5, fall into bottom liquefaction zone through above-mentioned separation net 41.Can open first valve 7, and apply downward external force to piston rod 32, thereby push piston 31 downward, compress air in solid iodine liquefaction container 10, drive liquid iodine 5 to flow towards connecting pipeline 6, finally condense and crystallize in iodine crystal storage tank 9, form iodine crystal.After removing external force, under the effect of multiple springs 33, above-mentioned piston 31 returns to initial position, thereby is convenient to push piston rod 32 next time.In order to improve the sealing property of flange 34 and solid iodine liquefaction container 10, sealing ring can be set at the outer circumference of flange 34.

[0045] Further, in order to improve the purity of iodine crystals, the iodine crystal storage tank 9 is also connected to a nitrogen purge device, specifically including an air inlet pipe, an air outlet pipe and a nitrogen bottle 11 connected to the iodine crystal storage tank 9. The air inlet pipe is connected to the nitrogen bottle 11, and a second valve 8 is provided on the air inlet pipe and the air outlet pipe to control the on-off of nitrogen. During the heating process of the flexible heating sheet 1, the second valve 8 on the air inlet pipe and the air outlet pipe can be opened to allow nitrogen to enter the iodine crystal storage tank 9, and other gases in the iodine crystal storage tank 9 are discharged through the air outlet pipe, so that the iodine crystal storage tank 9 is filled with nitrogen to avoid impurity gases from affecting the purity of iodine crystals.

[0046] To ensure that the iodine inside the iodine crystal storage tank 9 is filled with iodine, the amount of iodine that the iodine crystal storage tank 9 can accommodate is calculated based on the maximum particle density of the solid iodine particles 2, so that an appropriate amount is added to the solid iodine liquefaction container 10 to avoid blind increase or decrease, which is conducive to the rapid and accurate preparation of the working fluid.

[0047] The solid iodine working fluid liquefaction and crystallization device of the present invention utilizes the principle of solid iodine liquefaction and crystallization to liquefy and solidify solid iodine particles 2 with a density of 2.5 g / cm3 to form iodine crystals with a density of 4.93 g / cm3, thereby increasing the packing density and being able to store more fuel for use in the electric propulsion system, which is of great significance to the rapid development of the solid electric propulsion system.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A solid iodine working medium liquefaction crystallization device, characterized in that: include: A solid iodine liquefaction container, used to provide a dry environment for placing solid iodine particles; A truncated cone-shaped separation device is arranged in the solid iodine liquefaction container to divide the solid iodine liquefaction container into a solid iodine particle placement area and a bottom liquefaction area; A connecting pipeline and an iodine crystal storage tank, wherein two ends of the connecting pipeline are respectively connected to the bottom liquefaction zone and the iodine crystal storage tank, and the iodine crystal storage tank is used to receive liquid iodine and form iodine crystals; A heating component is provided to the solid iodine liquefaction container and the outer wall of the connecting pipeline to provide a liquefaction temperature for the solid iodine particles; A piston assembly is mounted on the top of the solid iodine liquefaction container and is used to push the liquid iodine into the iodine crystal storage tank; The nitrogen purge device is connected to the iodine crystal storage tank and is used to replace the impurity gas in the iodine crystal storage tank before the liquid iodine enters the iodine crystal storage tank.

2. The solid iodine working medium liquefaction crystallization device according to claim 1, characterized in that: The cross section of the truncated cone-shaped separation device is arranged in a trapezoidal shape, and the diameter of the truncated cone-shaped separation device gradually decreases from top to bottom.

3. The solid iodine working medium liquefaction crystallization device according to claim 1, characterized in that: A separation net is fixedly arranged at the bottom of the truncated cone type separation device, and the specification of the separation net is in the order of ≤10um.

4. The solid iodine working medium liquefaction crystallization device according to claim 1, characterized in that: The connecting pipeline is provided with a first valve for opening or closing the connecting pipeline.

5. The solid iodine working medium liquefaction crystallization device according to claim 1, characterized in that: The heating assembly comprises a flexible heating sheet, a power supply circuit connected to the flexible heating sheet, and a temperature measurement circuit.

6. The solid iodine working medium liquefaction crystallization device according to claim 5, characterized in that: The flexible heating sheet is arranged on the outer wall and the bottom end of the solid iodine liquefaction container and the outer wall of the connecting pipeline.

7. The solid iodine working medium liquefaction crystallization device according to claim 6, characterized in that: The flexible heating sheet is made of polyimide.

8. The solid iodine working medium liquefaction crystallization device according to claim 1, characterized in that: The piston assembly includes a flange, a piston, a piston rod and multiple springs. The flange and the piston are connected by multiple springs. The piston rod passes through the flange and is fixedly connected to the piston. In the assembled state, the flange is sealed to the top of the solid iodine liquefaction container, and the piston extends into the solid iodine liquefaction container.

9. The solid iodine working medium liquefaction crystallization device according to claim 1, characterized in that: The nitrogen purge device comprises an air inlet pipe and an air outlet pipe connected to the iodine crystal storage tank, the air inlet pipe is connected to the nitrogen bottle, and a second valve is arranged on the air inlet pipe and the air outlet pipe for controlling the on and off of nitrogen.

10. The solid iodine working medium liquefaction crystallization device according to claim 1, characterized in that: The solid iodine liquefaction container, the truncated cone-shaped separation device, the connecting pipeline and the iodine crystal storage tank are made of 316L stainless steel.

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