Negative pressure thermal cycle exhaust and filling system and method for microgravity fluid experiment working medium

Abstract

The present invention provides a negative pressure thermal cycle exhaust and filling system and method for working medium in microgravity fluid experiment, the negative pressure thermal cycle exhaust and filling system includes a vacuum system and a temperature control system; the vacuum system includes a stepping motor, a liquid cylinder, a suction bottle and a vacuum pump; the suction pipe is provided with a first switch valve; the output end of the vacuum pump is connected to the air cavity of the suction bottle through a vacuum tube; the vacuum tube between the suction bottle and the vacuum pump is also provided with a pressure relief valve and a second switch valve in sequence; the temperature control system includes a temperature controller and a heating plate; the heating plate is fixed to the outer bottom of the suction bottle; the temperature controller is electrically connected to the heating plate. The present invention can realize the two functions of exhaust and liquid injection of the working medium by performing negative pressure thermal cycle operation on the fluid working medium. Compared with the traditional simple thermal cycle, the negative pressure can greatly improve the exhaust rate. At the same time, the system is simple to build, not limited by the site, low in cost and high in efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of experimental working fluid filling, and in particular to a negative pressure thermal cycle exhaust and filling system and method for microgravity fluid experimental working fluid. Background Art

[0002] In recent years, the filling of fluid working medium in microgravity experiments has become a difficult problem that needs to be solved urgently in space fluid management. The presence of bubbles in the fluid working medium will cause great trouble to the establishment of the experimental model and the observation of the experimental results, which seriously affects the results of space experiments. Existing space technologies mostly use the method of directly filling the liquid and then discharging the bubbles, that is, directly filling the fluid working medium, and then heating and cooling the model multiple times in a cycle to achieve the discharge of bubbles in the fluid by means of thermal expansion and contraction. Because the buoyancy effect disappears in the microgravity environment and the convection in the load system is very slow, the bubbles in the fluid cannot escape in this scheme, and the bubbles can only be reduced by changing the physical properties. In addition, repeated cyclic heating will also affect the maintenance of the fluid model, and only part of the fluid working medium can be operated each time, which takes up a lot of precious space experiment time and resources. Summary of the invention

[0003] In view of the technical problems existing in the above-mentioned background technology, the present invention proposes a microgravity fluid experimental working medium negative pressure thermal cycle exhaust and filling system and method, which can realize the two functions of exhaust and filling of the working medium by performing negative pressure thermal cycle operation on the fluid working medium. Compared with the traditional simple thermal cycle, the negative pressure can greatly improve the exhaust rate. At the same time, the system is simple to build, not restricted by the site, low in cost and high in efficiency.

[0004] In order to solve the above technical problems, the present invention provides a microgravity fluid experimental working medium negative pressure thermal cycle exhaust and filling system, which includes a vacuum pumping system and a temperature control system located on one side of the vacuum pumping system;

[0005] The vacuum system includes a stepper motor, a liquid cylinder matched with one side of the stepper motor, and a suction bottle and a vacuum pump matched with the side of the liquid cylinder; the power output end of the stepper motor is matched and connected with the piston rod head of the liquid cylinder; the liquid cylinder is located on one side of the stepper motor, and its liquid inlet is connected with an external liquid storage device through a pipeline, and its liquid outlet is connected to the suction bottle through a suction pipe; a first switch valve is provided on the suction pipe; the output end of the vacuum pump is connected with the air cavity of the suction bottle through a vacuum pipe; the vacuum pipe from the suction bottle to the vacuum pump is also matched with a pressure relief valve and a second switch valve in sequence;

[0006] The temperature control system includes a temperature controller and a heating plate; the heating plate is matched and fixed on the outer bottom of the suction filtration bottle; the temperature controller is electrically connected to the heating plate, and the temperature controller controls the heating plate to heat the suction filtration bottle.

[0007] The microgravity fluid experimental working medium negative pressure thermal cycle exhaust and filling system, wherein: when the liquid cylinder is emptied, it is located at the positive limit position of the stepping motor.

[0008] The microgravity fluid experiment working medium negative pressure thermal cycle exhaust and filling system, wherein: the negative pressure thermal cycle exhaust and filling system also includes a vacuum gauge; the vacuum gauge is matched and arranged on the vacuum tube located between the suction bottle and the pressure relief valve.

[0009] A method for exhausting and filling a negative pressure thermal cycle of a microgravity fluid experimental working medium, based on the above-mentioned negative pressure thermal cycle exhausting and filling system of a microgravity fluid experimental working medium; it includes vacuum degassing of silicone oil and vacuum filling of silicone oil working medium;

[0010] The process of vacuum degassing of silicone oil is as follows: putting silicone oil into a suction filtration bottle, evacuating the suction filtration bottle and heating the filtration bottle, and after completion, sucking the degassed silicone oil into a syringe for storage;

[0011] The process of vacuuming and filling the silicone oil working medium is as follows: pushing the liquid cylinder to the bottom and vacuuming the liquid cylinder and the suction filter tube, then opening the second switch valve to allow the silicone oil to enter the suction filter tube to remove the gas in the suction filter tube, and finally the stepper motor moves backward to absorb the liquid, so that the liquid enters the liquid cylinder from the external liquid storage device.

[0012] The method for negative pressure thermal cycle exhaust and filling of working fluid in microgravity fluid experiment, wherein: during the silicone oil vacuum degassing process, the filter bottle is evacuated to <100Pa, heated to 60±5°C, and maintained for 1 to 1.5 hours.

[0013] The method for negative pressure thermal cycle exhaust and filling of working fluid in microgravity fluid experiment, wherein: the liquid cylinder and the suction filter tube are evacuated to <200Pa during the vacuum filling process of the silicone oil working fluid.

[0014] The microgravity fluid experimental working medium negative pressure thermal cycle exhaust and filling method, wherein the specific steps are as follows:

[0015] 1) Build the vacuum system and temperature control system, and confirm that the stepper motor position is the positive limit;

[0016] 2) Close the pressure relief valve, open the first switch valve and the second switch valve, and evacuate the suction flask to a pressure of <200Pa;

[0017] 3) While evacuating the vacuum, the temperature controller controls the heating plate to heat the filtration bottle;

[0018] 4) Close the second switch valve, open the pressure relief valve, and open the first switch valve. During this process, the silicone oil is pressed into the suction filter pipe and into the liquid cylinder under the action of air pressure;

[0019] 5) Control the stepper motor to push and pull the piston rod of the hydraulic cylinder at full stroke until all the residual bubbles in the suction filter tube are exhausted;

[0020] 6) After the stepper motor is moved backward to the negative limit, the silicone oil is sucked into the liquid cylinder from the external liquid storage device;

[0021] 7) Close the first switch valve, open the second switch valve, release the negative pressure of the vacuum pump, and then close the second switch valve and the pressure relief valve;

[0022] 8) Disconnect the suction filter tube from the first switch valve to complete the filling of the working fluid.

[0023] By adopting the above technical solution, the present invention has the following beneficial effects:

[0024] The microgravity fluid experimental working medium negative pressure thermal cycle exhaust and filling system and method of the present invention are reasonably conceived. By performing negative pressure thermal cycle operation on the fluid working medium, the two functions of exhaust and filling of the working medium can be realized. Compared with the traditional simple thermal cycle, the negative pressure can greatly improve the exhaust rate. At the same time, the instruments and equipment selected by the present invention are all existing finished products and can be purchased on the market. The system is simple to build, not restricted by the site, low in cost and high in efficiency.

[0025] The present invention exhausts the fluid experimental working medium in advance on the ground by means of vacuuming and heating. One exhaust operation can complete the filling of tens to hundreds of ml of the working medium. The fluid working medium after the operation can be directly stored in the liquid cylinder and can be directly connected to the experimental equipment through the suction filter tube, making the storage and transportation of the fluid easier.

[0026] The operation of the present invention can be carried out on the ground without occupying precious space resources. The exhaust work of all fluid working fluids can be completed in one operation, and the working fluids are all stored in the liquid cylinder, which will not cause secondary pollution. By replacing the pipeline, it can be directly connected to the experimental equipment (that is, the experimental equipment that needs to use the working fluid, such as a new liquid cylinder, or an experimental model, etc.), and can be launched with the cabin. In space, space experiments can be carried out directly through suction operations without the need for secondary exhaust operations, thereby saving a lot of valuable time for space experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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 in the following description 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.

[0028] Figure 1 It is a schematic diagram of the structure of the negative pressure thermal cycle exhaust and filling system of the working medium in the microgravity fluid experiment of the present invention;

[0029] Figure 2 It is a schematic diagram of the silicone oil being pressed into the suction filter tube in the method for exhausting and filling the working medium under negative pressure thermal cycle in the microgravity fluid experiment of the present invention;

[0030] Figure 3 It is a temperature control curve diagram of the heating plate heating the suction filtration bottle in the microgravity fluid experimental working medium negative pressure thermal cycle exhaust and filling method of the present invention;

[0031] Figure 4 It is a schematic diagram of the silicone oil being pressed into the suction filter tube in the method for exhausting and filling the working medium under negative pressure thermal cycle in the microgravity fluid experiment of the present invention;

[0032] Figure 5 It is a schematic diagram of the structure of the stepping motor pumping liquid back and forth in the method for exhausting and filling the working medium under negative pressure thermal cycle in the microgravity fluid experiment of the present invention;

[0033] Figure 6 It is a schematic diagram of the vacuuming and filling of silicone oil in the method for exhausting and filling the working medium under negative pressure thermal cycle in the microgravity fluid experiment of the present invention;

[0034] Figure 7 It is a schematic diagram of releasing the negative pressure of the vacuum pump in the method for exhausting and filling the negative pressure thermal cycle of the working medium in the microgravity fluid experiment of the present invention. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not 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.

[0036] The present invention is further explained below in conjunction with specific implementation modes.

[0037] like Figure 1 As shown, the negative pressure thermal cycle exhaust and filling system for microgravity fluid experiment working fluid provided in this embodiment includes a vacuum pumping system 1 and a temperature control system 2.

[0038] The vacuum pumping system 1 includes a stepping motor 11 , a liquid cylinder 12 , a suction filter bottle 13 , a vacuum gauge 14 , a vacuum pump 15 and a pressure relief valve 16 .

[0039] The power output end of the stepper motor 11 is matched and connected with the piston rod head of the hydraulic cylinder 12 .

[0040] When the liquid cylinder 12 is emptied, it is located at the positive limit position of the stepper motor 11 (i.e., at the maximum range position of the stepper motor 11, 25 mm), and its inlet and outlet ports are connected to a suction filter tube 121 and connected to the suction filter bottle 13 through the suction filter tube 121. The suction filter tube 121 is also provided with a first switch valve 122.

[0041] The output end of the vacuum pump 15 is connected to the air cavity of the suction bottle 13 through a vacuum tube 151. The vacuum tube 151 from the suction bottle 13 to the output end of the vacuum pump 15 is also provided with a vacuum gauge 14, a pressure relief valve 16 and a second switch valve 152 in sequence.

[0042] The temperature control system 2 includes a temperature controller 21 and a heating plate 22. The heating plate 22 is matched and fixed to the outer bottom of the suction filtration bottle 13; the temperature controller 21 is electrically connected to the heating plate 22 through a cable, and the temperature controller 21 controls the heating plate 22 to heat.

[0043] The negative pressure thermal cycle exhaust and filling system for microgravity fluid experiment working fluid of the present invention is to firstly undergo a vacuum degassing operation and then fill the working fluid when carrying out the working fluid (such as silicone oil) in space experiments.

[0044] The invention discloses a negative pressure thermal cycle exhaust and filling method for a microgravity fluid experiment working medium, comprising silicone oil vacuum degassing and silicone oil working medium vacuum filling.

[0045] The above-mentioned process of vacuum degassing of silicone oil is as follows: put silicone oil into the suction filtration bottle 13, evacuate to <100Pa, heat to 60±5℃ (the best implementation temperature is 60℃), keep for 1h-1.5h (the best implementation time is 1h), then end the operation and suck the degassed silicone oil into the syringe for storage.

[0046] The above-mentioned process of vacuuming and filling the silicone oil working medium is: push the liquid cylinder 12 to the bottom, vacuum the liquid cylinder 12 and the suction filter tube 121 to <200Pa, then open the second switch valve 152 to allow the silicone oil to enter the suction filter tube 121, and remove the gas in the suction filter tube 121, and finally the stepper motor 11 retreats to absorb the liquid so that the liquid enters the liquid cylinder 12 from the external liquid storage device.

[0047] The method for exhausting and filling the negative pressure thermal cycle of the working medium in the microgravity fluid experiment of the present invention has the following specific steps:

[0048] 1) Build a vacuum system and a working fluid heating system. The principle is as follows Figure 1 , and confirm that the position of the stepper motor 11 is at the positive limit (i.e. the maximum range position of the stepper motor 11 is 25mm);

[0049] 2) Close the pressure relief valve 16, open the first switch valve 122 and the second switch valve 152, and evacuate the suction bottle 13 to a vacuum level of <200Pa; Figure 2 ;

[0050] 3) While evacuating, the heating plate 22 heats the suction filtration bottle 13, and the temperature control curve is as follows: Figure 3 As shown;

[0051] 4) Close the second switch valve 152, open the pressure relief valve 16, and open the first switch valve 122. During this process, the silicone oil is pressed into the suction filter pipe 121 and enters the liquid cylinder 12 under the action of air pressure. Figure 4 ;

[0052] 5) Control the stepper motor 11 to push and pull 3 times (the number is unlimited, 3 times is the optimal number), each push and pull distance is the full stroke of the stepper motor 11, and the residual bubbles in the suction tube 121 are exhausted. Figure 5 ;

[0053] 6) After the stepper motor 11 is moved back to the negative limit position (i.e., when the stepper motor moves to the 0mm position, the liquid cylinder 12 can be filled), the silicone oil is sucked into the liquid cylinder 12 from the external liquid storage device. Figure 6 ;

[0054] 7) Close the first switch valve 122, open the second switch valve 152, release the negative pressure of the vacuum pump 15, and then close the second switch valve 152 and the pressure relief valve 16. Figure 7 ;

[0055] 8) Disconnect the suction filter tube 121 from the first switch valve 122 to complete the filling of the working fluid.

[0056] The present invention can realize the two functions of exhaust and injection of the working medium by performing negative pressure heat cycle operation on the fluid working medium. Compared with the traditional simple heat cycle, the negative pressure can greatly improve the exhaust rate. At the same time, the system is simple to build, not restricted by the site, low in cost and high in efficiency.

[0057] 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 negative pressure thermal cycle exhaust and filling system for microgravity fluid experiment, characterized by: The negative pressure heat cycle exhaust and filling system comprises a vacuum system (1) and a temperature control system (2) located on one side of the vacuum system (1); The vacuum pumping system (1) comprises a stepping motor (11), a liquid cylinder (12) matched to be located at one side of the stepping motor (11), and a suction bottle (13) and a vacuum pump (15) matched to be located beside the liquid cylinder (12); the power output end of the stepping motor (11) is matched to be connected with the piston rod head of the liquid cylinder (12); the liquid cylinder (12) is located at one side of the stepping motor (11), its liquid inlet is connected to an external liquid storage device through a pipeline, and its liquid outlet is connected to the suction bottle (13) through a suction pipe (121); a first switch valve (122) is provided on the suction pipe (121); the output end of the vacuum pump (15) is connected to the air cavity of the suction bottle (13) through a vacuum pipe (151); a pressure relief valve (16) and a second switch valve (152) are matched to be provided in sequence on the vacuum pipe (151) between the suction bottle (13) and the vacuum pump (15); The temperature control system (2) comprises a temperature controller (21) and a heating plate (22); the heating plate (22) is matched and fixed to the outer bottom of the suction filtration bottle (13); the temperature controller (21) is electrically connected to the heating plate (22), and the heating plate (22) is controlled by the temperature controller (21) to heat the suction filtration bottle (13).

2. The microgravity fluid experiment working medium negative pressure thermal cycle exhaust and filling system as claimed in claim 1, characterized in that: When the liquid cylinder (12) is emptied, it is located at the positive limit position of the stepping motor (11).

3. The microgravity fluid experiment working medium negative pressure thermal cycle exhaust and filling system as claimed in claim 1, characterized in that: The negative pressure heat cycle exhaust and filling system also includes a vacuum gauge (14); the vacuum gauge (14) is matched and arranged on the vacuum tube (151) between the suction bottle (13) and the pressure relief valve (16).

4. A method for exhausting and filling a working medium under negative pressure thermal cycle in a microgravity fluid experiment, based on the exhausting and filling system for exhausting and filling a working medium under negative pressure thermal cycle in a microgravity fluid experiment as described in any one of claims 1 to 3 above; characterized in that: Including silicone oil vacuum degassing and silicone oil working medium vacuum filling; The process of vacuum degassing of silicone oil is as follows: taking silicone oil and putting it into a suction filtration bottle (13), evacuating and heating the suction filtration bottle (13), and after completion, sucking the degassed silicone oil into a syringe for storage; The process of vacuuming and filling the silicone oil working medium is as follows: pushing the liquid cylinder (12) to the bottom and vacuuming the liquid cylinder (12) and the suction filter tube (121), then opening the second switch valve (152) to allow the silicone oil to enter the suction filter tube (121) to remove the gas in the suction filter tube (121), and finally moving the stepper motor (11) backward to absorb the liquid, so that the liquid enters the liquid cylinder (12) from the external liquid storage device.

5. The method for exhausting and filling negative pressure thermal cycle of working fluid in microgravity fluid experiment according to claim 4, characterized in that: During the vacuum degassing process of the silicone oil, the suction filtration bottle (13) is evacuated to a vacuum level of <100 Pa, heated to 60±5° C., and maintained for 1 to 1.5 hours.

6. The method for exhausting and filling negative pressure thermal cycle of working medium in microgravity fluid experiment according to claim 4, characterized in that: During the process of vacuuming and filling the silicone oil working medium, the liquid cylinder (12) and the suction filter tube (121) are vacuumed to less than 200 Pa.

7. The method for exhausting and filling negative pressure thermal cycle of working fluid in microgravity fluid experiment according to claim 4, characterized in that: The specific steps of the negative pressure heat cycle exhaust and filling method are as follows: 1) Build a vacuum system (1) and a temperature control system (2), and confirm that the position of the stepper motor (11) is at the positive limit; 2) closing the pressure relief valve (16), opening the first switch valve (122) and the second switch valve (152), and evacuating the suction filtration bottle (13) to a pressure of <200 Pa; 3) While evacuating the vacuum, the temperature controller (21) controls the heating plate (22) to heat the suction filtration bottle (13); 4) closing the second switch valve (152), opening the pressure relief valve (16), and opening the first switch valve (122). During this process, the silicone oil is pressed into the suction filter pipe (121) and into the liquid cylinder (12) under the action of air pressure; 5) Controlling the stepping motor (11) to push and pull the piston rod of the hydraulic cylinder (12) at full stroke until all the residual bubbles in the suction filter tube (121) are exhausted; 6) After the stepper motor (11) is moved backward to the negative limit position, silicone oil is sucked from the external liquid storage device into the liquid cylinder (12); 7) closing the first switch valve (122), opening the second switch valve (152), releasing the negative pressure of the vacuum pump (15), and then closing the second switch valve (152) and the pressure relief valve (16); 8) Disconnect the suction filter tube (121) from the first switch valve (122) to complete the filling of the working fluid.

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