Energy liquid conveying and distributing system

Abstract

The invention relates to the technical field of rocket engine tests, and discloses an energy liquid conveying and distributing system, which comprises an energy liquid storage tank, an energy liquid conveying device, an energy liquid distribution device and a control device, the gas extrusion subsystem is connected with the energy liquid storage tank, the gas extrusion subsystem is suitable for extruding energy liquid in the energy liquid storage tank, and the energy liquid is output from the energy liquid output port; the variable frequency pump is connected with the energy liquid output port; the variable-frequency pump adjusts the output flow of the energy liquid storage tank in a variable-frequency manner; the plurality of output branches connected in parallel are connected with the variable frequency pump; and the plurality of output branches respectively provide energy liquid for test pieces at different stations. The flow of the energy liquid is continuously adjusted through the variable frequency pump, smooth switching of the total flow of the energy liquid is achieved from the source, real-time smooth switching of the conveying flow and wide-amplitude change of the flow are achieved in combination with pressure control of the gas extrusion subsystem, and the device has the advantages of being wide in adjusting range and high in adjusting precision.

Description

Technical Field

[0001] The invention relates to the technical field of rocket engine testing, and in particular to an energy liquid delivery and distribution system. Background Art

[0002] For multiple test pieces in rocket engine tests, energy liquids such as liquid oxygen and alcohol are often used as energy working fluids.

[0003] Taking alcohol as an example, alcohol is usually transported to multiple test pieces through supply pipelines. During the test, it is not only required to meet the changes in the supply flow, but also to ensure the stability after the flow changes. In rocket engine tests, nitrogen extrusion is usually used to adjust the pressure in the alcohol storage tank to control the flow and pressure of alcohol delivery. The above method of controlling the alcohol delivery flow and pressure is less effective, and it is difficult to achieve real-time smooth switching of the delivery flow under different working conditions. Summary of the invention

[0004] In view of this, the present invention provides an energy liquid delivery and distribution system to solve the problem that the existing method of adjusting the pressure in the alcohol storage tank by nitrogen extrusion to control the alcohol delivery flow and pressure is poor and it is difficult to achieve real-time smooth switching of the delivery flow under different working conditions.

[0005] The present invention provides an energy liquid delivery and distribution system, comprising: An energy liquid storage tank, storing energy liquid inside, and the energy liquid storage tank is provided with an energy liquid output port; A gas extrusion subsystem is connected to the energy liquid storage tank, and the gas extrusion subsystem is suitable for extruding the energy liquid in the energy liquid storage tank, and the energy liquid is output from the energy liquid output port; A variable frequency pump, the input end of which is connected to the energy liquid output port; the variable frequency pump is suitable for adjusting the output flow of the energy liquid storage tank by frequency conversion; The input ends of the multiple parallel output branches are all connected to the output ends of the variable frequency pump, and the output ends of the multiple output branches are suitable for providing energy liquid to the test pieces at different workstations respectively. Beneficial effect: The present application adopts the above technical solution, and continuously adjusts the flow rate of the energy liquid through the variable frequency pump to achieve smooth switching of the total flow rate of the energy liquid at the source. At the same time, combined with the pressure control of the gas extrusion subsystem, it can achieve real-time smooth switching of the delivery flow rate and wide range of flow rate changes, which has the advantages of wide adjustment range and high adjustment accuracy.

[0006] Optionally, the energy liquid is liquid oxygen or alcohol.

[0007] Optionally, the variable frequency pump is a centrifugal pump or a shielded pump.

[0008] Optionally, it also includes: A reflux regulating valve, one end of which is connected to the energy liquid reflux port provided in the energy liquid storage tank; The reflux valve has one end connected to the other end of the reflux regulating valve, and the other end of the reflux valve is connected to the output end of the variable frequency pump. Beneficial effect: The present application adopts the above technical solution, further combined with the valve opening adjustment of the reflux regulating valve, to better achieve real-time smooth switching of the delivery flow.

[0009] Optionally, the output branch includes: An orifice plate, one end of which is connected to the output end of the variable frequency pump; The branch valve has one end connected to the other end of the orifice plate, and the other end of the branch valve is connected to the energy liquid input port of the test piece. Beneficial effect: The present application adopts the above technical solution, further combined with the orifice plate, to reasonably distribute the flow resistance of the energy liquid, so that the flow resistance of each output branch is as close as possible, and the flow distribution is performed according to the design index, so as to meet the high-precision and stable control requirements of the flow and pressure of each output branch, and realize the functional characteristics of the same flow and pressure at the outlet of the output branch.

[0010] Optionally, the gas extrusion subsystem comprises: A pressurized gas supply structure, adapted to provide pressurized gas; A plurality of boost valves, one end of which is connected to the boost gas supply structure; One end of a plurality of flow limiting elements is respectively connected to the other end of a plurality of boosting valves, and the other end of the plurality of flow limiting elements is connected to the energy liquid storage tank; the gas extrusion subsystem is suitable for opening at least one boosting valve by combination to adjust the extrusion force.

[0011] Optionally, a branch flow meter is provided on the output branch. Beneficial effect: The present application adopts the above technical solution to accurately measure the flow of the output branch.

[0012] Optionally, a branch pressure sensor is provided on the output branch. Beneficial effect: The application adopts the above technical solution to accurately measure the pressure of the output branch.

[0013] Optionally, it also includes: The discharge pipeline is connected to the output end of the variable frequency pump, and a discharge valve is arranged on the discharge pipeline. Beneficial effect: The present application adopts the above technical solution, and by setting a discharge valve, the energy liquid in the pipeline can be discharged during the rocket engine test or in an emergency, thereby ensuring the safety of the energy liquid delivery and distribution system.

[0014] Optionally, the pipelines of the energy liquid delivery and distribution system are located on the same horizontal plane. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] Figure 1 It is a connection diagram of the energy liquid delivery and distribution system provided in an embodiment of the present invention.

[0017] Description of reference numerals: 1. First booster valve; 2. First flow limiting element; 3. Second booster valve; 4. Second flow limiting element; 5. Third booster valve; 6. Third flow limiting element; 7. Boost check valve; 8. First pressure sensor; 9. Pressure measuring hand valve; 10. Safety valve; 11. Vent valve; 12. Energy liquid storage tank; 13. First level gauge hand valve; 14. Level gauge; 15. Second level gauge hand valve; 16. First main valve; 17. Purge valve; 18. Purge check valve; 19. Second pressure sensor; 20. Frequency conversion pump; 21. Check valve after pump; 22. Second main valve; 23. First flow meter; 24. Backflow regulating valve; 25. Backflow valve; 26. Second flow meter; 27. Vent hand valve; 28. Third main valve; 29 , discharge valve; 30, third pressure sensor; 31, filter; 32, fourth pressure sensor; 33, first orifice plate; 34, third flow meter; 35, first branch valve; 36, fifth pressure sensor; 37, second orifice plate; 38, fourth flow meter; 39, second branch valve; 40, sixth pressure sensor; 41, third orifice plate; 42, fifth flow meter; 43, third branch valve; 44, seventh pressure sensor; 45, fourth orifice plate; 46, sixth flow meter; 47, fourth branch valve; 48, pressurized gas supply structure; 49, purge gas supply structure; 50, first station test piece; 51, second station test piece; 52, third station test piece; 53, fourth station test piece. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0019] The pressure in the alcohol storage tank is adjusted by nitrogen extrusion to control the flow rate and pressure of alcohol delivery, which makes it difficult to meet the equal flow and equal pressure distribution of each branch. When the total alcohol output flow is constant, the change of the flow rate of one or more branches will affect the flow distribution of other branches; if the pipeline design of the main pipe and the branch pipe is unreasonable, the proximal flow rate is large and the distal flow rate is small, resulting in the proportion of alcohol entering the test piece not meeting the test requirements, seriously affecting the normal progress of the test. Traditional alcohol delivery flow distribution is generally achieved by selecting branches with the same diameter, squeezing the alcohol into each branch, and then delivering it to the entrance of the test piece. The above-mentioned alcohol delivery flow distribution method not only consumes a large amount of nitrogen, but also makes it difficult to meet the requirements of smooth switching of the flow rate and pressure at the entrance of each branch. It is also due to the above reasons that the present application proposes an energy liquid delivery and distribution system.

[0020] like Figure 1 A specific implementation of the energy liquid delivery and distribution system shown includes: an energy liquid storage tank 12, a gas extrusion subsystem, a variable frequency pump 20, a plurality of parallel output branches, a reflux regulating valve 24, a reflux valve 25, a discharge pipeline and a liquid level meter 14.

[0021] The energy liquid storage tank 12 stores energy liquid inside, and specifically, the energy liquid is liquid oxygen or alcohol. The energy liquid storage tank 12 is provided with an energy liquid output port. The gas extrusion subsystem is connected to the energy liquid storage tank 12, and the gas extrusion subsystem is suitable for extruding the energy liquid in the energy liquid storage tank 12, and the energy liquid is output from the energy liquid output port. The input end of the variable frequency pump 20 is connected to the energy liquid output port; the variable frequency pump 20 is suitable for adjusting the output flow of the energy liquid storage tank 12 by frequency conversion; specifically, the variable frequency pump 20 is a centrifugal pump or a shielded pump. The variable frequency pump 20 includes: a frequency converter, a drive motor and a pump itself are connected in sequence; the variable frequency pump 20 uses the characteristic that the speed of the drive motor is proportional to the frequency of the frequency converter to achieve the goal of continuously adjusting the speed of the drive motor, and then adjusts the speed of the pump itself, so as to achieve smooth switching of the total flow of the energy liquid at the source. The variable frequency pump 20 is used for flow change control, adjusting the frequency converter, and when the frequency of the frequency converter is changed, the output flow of the variable frequency pump 20 changes. The head and flow characteristic curves of the variable frequency pump 20 should be smooth, and the flow and head characteristics under various working conditions should remain stable. It can also be equipped with a variable frequency electric control cabinet. The variable frequency pump 20 is connected to the variable frequency electric control cabinet signal to realize remote start and stop control and remote frequency conversion adjustment control of the variable frequency pump 20.

[0022] The input ends of the multiple parallel output branches are all connected to the output end of the variable frequency pump 20, and the output ends of the multiple output branches are suitable for providing energy liquid to the test pieces at different positions. One end of the liquid level gauge 14 is connected to the energy liquid storage tank 12 through the first liquid level gauge manual valve 13, and the other end of the liquid level gauge 14 is connected to the energy liquid storage tank 12 through the second liquid level gauge manual valve 15.

[0023] Furthermore, the energy liquid storage tank 12 is also connected to a vent valve 11; the energy liquid storage tank 12 is also connected to a pressure measuring hand valve 9, and the pressure measuring hand valve 9 is connected to a first pressure sensor 8. The energy liquid storage tank 12 is also connected to a safety valve 10. A first main valve 16 is provided on the pipeline connecting the variable frequency pump 20 and the energy liquid outlet. The pipeline connecting the variable frequency pump 20 and the energy liquid outlet is also connected to a purge check valve 18, and the purge check valve 18 is connected to a purge valve 17, and the purge valve 17 is connected to a purge gas supply structure 49. By opening the purge valve 17, the pipeline of the energy liquid delivery and distribution system can be purged. The pipeline connecting the variable frequency pump 20 and the energy liquid outlet is also connected to a second pressure sensor 19; the outlet of the variable frequency pump 20 is connected to a post-pump check valve 21.

[0024] One end of the reflux regulating valve 24 is connected to the energy liquid reflux port provided in the energy liquid storage tank 12. One end of the reflux valve 25 is connected to the other end of the reflux regulating valve 24, and the other end of the reflux valve 25 is connected to the output end of the variable frequency pump 20. When the reflux valve 25 is opened, the reflux regulating valve 24 can be used to debug the flow change of the energy liquid and adjust the reflux flow. The frequency of the variable frequency pump 20 can be adjusted online and the opening of the reflux regulating valve 24 can be adjusted in combination. At the same time, the energy liquid delivery and distribution system can be compared with the operating condition envelope curve in real time to achieve a rapid response of the flow and pressure of the energy liquid under continuously changing operating conditions; based on the design of the energy liquid delivery and distribution system and the integrated measurement and control hardware configuration, the energy liquid delivery and distribution system can be efficiently operated and maintained through network information interaction, lower software programming and human-computer interaction interface technologies. In addition, by utilizing the overshoot effect in the closed-loop control, the variable frequency pump 20 and the reflux regulating valve 24 can be controlled by split action and split range through software logic and functional decoupling. Practical results have shown that the variable operating condition rapid voltage stabilization technology of the energy liquid delivery and distribution system described in this application not only covers the flow-pressure supply range of the rocket engine test process, but also meets the requirements of high steady-state accuracy and fast stabilization time, and realizes the extremely simple operation of one-button closed-loop and stepless following.

[0025] Furthermore, a second main valve 22 and a first flow meter 23 are sequentially connected on the pipeline between the reflux valve 25 and the post-pump check valve 21; a second flow meter 26, a third main valve 28 and a filter 31 are sequentially connected on the pipeline between the reflux valve 25 and the output branch; a deflation hand valve 27 is connected to the pipeline connecting the second flow meter 26 and the third main valve 28. A third pressure sensor 30 is connected to the pipeline connecting the third main valve 28 and the filter 31.

[0026] Specifically, the output branch includes: an orifice plate and a branch valve. The orifice plates on different output branches are set with different apertures to achieve the purpose of regulating the flow resistance of different output branches. In order to improve the control accuracy of the flow resistance, the aperture size of the orifice plate is simulated and designed using AMESim software. One end of the orifice plate is connected to the output end of the variable frequency pump 20; one end of the branch valve is connected to the other end of the orifice plate, and the other end of the branch valve is connected to the energy liquid input port of the test piece. Furthermore, a branch flowmeter and a branch pressure sensor are provided on the output branch. Figure 1 As shown, the orifice plate includes: a first orifice plate 33, a second orifice plate 37, a third orifice plate 41 and a fourth orifice plate 45; the branch valve includes: a first branch valve 35, a second branch valve 39, a third branch valve 43 and a fourth branch valve 47; the first orifice plate 33, the second orifice plate 37, the third orifice plate 41 and the fourth orifice plate 45 are respectively connected to the first branch valve 35, the second branch valve 39, the third branch valve 43 and the fourth branch valve 47. The branch flow meter includes: a third flow meter 34, a fourth flow meter 38, a fifth flow meter 42 and a sixth flow meter 46; the third flow meter 34 is arranged between the first orifice plate 33 and the first branch valve 35; the fourth flow meter 38 is arranged between the second orifice plate 37 and the second branch valve 39; the fifth flow meter 42 is arranged between the third orifice plate 41 and the third branch valve 43; the sixth flow meter 46 is arranged between the fourth orifice plate 45 and the fourth branch valve 47. The branch pressure sensor includes: a fourth pressure sensor 32, a fifth pressure sensor 36, a sixth pressure sensor 40 and a seventh pressure sensor 44; the fourth pressure sensor 32, the fifth pressure sensor 36, the sixth pressure sensor 40 and the seventh pressure sensor 44 are respectively arranged at the inlet of the first orifice plate 33, the second orifice plate 37, the third orifice plate 41 and the fourth orifice plate 45. The first branch valve 35 is connected to the energy liquid input port of the first station test piece 50, the second branch valve 39 is connected to the energy liquid input port of the second station test piece 51, the third branch valve 43 is connected to the energy liquid input port of the third station test piece 52, and the fourth branch valve 47 is connected to the energy liquid input port of the fourth station test piece 53.

[0027] Specifically, the gas extrusion subsystem includes: a pressurized gas supply structure 48, a plurality of boosting valves and a plurality of flow limiting elements. The pressurized gas supply structure 48 is suitable for providing pressurized gas, and the pressurized gas can be nitrogen; one end of the plurality of boosting valves is connected to the pressurized gas supply structure. One end of the plurality of flow limiting elements is respectively connected to the other end of the plurality of boosting valves, and the other end of the plurality of flow limiting elements is connected to the energy liquid storage tank 12; the gas extrusion subsystem is suitable for adjusting the extrusion force by opening at least one boosting valve in combination. Figure 1 As shown, the boost valve includes: a first boost valve 1, a second boost valve 3 and a third boost valve 5; the flow limiting element includes: a first flow limiting element 2, a second flow limiting element 4 and a third flow limiting element 6; the first boost valve 1, the second boost valve 3 and the third boost valve 5 are respectively connected to the first flow limiting element 2, the second flow limiting element 4 and the third flow limiting element 6. The boosting method can be one-way boosting, such as opening one of the first boost valve 1, the second boost valve 3 or the third boost valve 5; it can also be two-way boosting, such as opening the first boost valve 1 and the third boost valve 5 at the same time; it can also be three-way boosting, that is, opening the first boost valve 1, the second boost valve 3 and the third boost valve 5 at the same time.

[0028] Furthermore, a pressurized check valve 7 is provided between the plurality of flow-limiting elements and the energy liquid storage tank 12 to prevent the pressurized gas from flowing back.

[0029] The discharge pipeline may be connected to the output end of the variable frequency pump 20, and a discharge valve 29 is provided on the discharge pipeline. Alternatively, a discharge pipeline is connected to the pipeline connecting the second flow meter 26 and the third main valve 28.

[0030] Furthermore, the pipelines of the energy liquid delivery and distribution system are located on the same horizontal plane. When arranging the pipelines, elbows and reducers are minimized to reduce flow resistance; the number of connectors and redundant valves is minimized.

[0031] After actual verification, taking alcohol as an energy liquid as an example, after adopting the technical solution of this application, the output flow range of the energy liquid delivery and distribution system can reach 10m 3 / h~500m 3 / h, the accuracy of the total alcohol delivery flow can be stably controlled within 1%; the output pressure range after the frequency conversion pump 20 is 0.5MPa~6MPa, and the pressure accuracy after the frequency conversion pump 20 can be stably controlled within 0.1%; the flow range of each output branch is 10m 3 / h~50m 3 / h, the flow rate of each output branch is 50m 3 / h, the flow difference between each output branch is controlled at 0.5m 3 / h; the pressure range of each output branch is 0.5MPa~6MPa. When the pressure of each output branch is 3MPa, the pressure difference between the output branches is controlled within 0.02MPa.

[0032] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An energy liquid delivery and distribution system, characterized in that: include: An energy liquid storage tank (12) storing energy liquid therein, wherein the energy liquid storage tank (12) is provided with an energy liquid output port; a gas extrusion subsystem connected to the energy liquid storage tank (12), the gas extrusion subsystem being adapted to squeeze the energy liquid in the energy liquid storage tank (12), the energy liquid being output from the energy liquid output port; A variable frequency pump (20), the input end of which is connected to the energy liquid output port; the variable frequency pump (20) is suitable for adjusting the output flow rate of the energy liquid storage tank (12) by frequency conversion; The input ends of the multiple parallel output branches are all connected to the output end of the variable frequency pump (20), and the output ends of the multiple output branches are suitable for providing energy liquid for test pieces at different workstations.

2. The energy liquid delivery and distribution system according to claim 1, characterized in that: The energy liquid is liquid oxygen or alcohol.

3. The energy liquid delivery and distribution system according to claim 1, characterized in that: The variable frequency pump (20) is a centrifugal pump or a shielded pump.

4. The energy liquid delivery and distribution system according to any one of claims 1 to 3, characterized in that: Also includes: A reflux regulating valve (24), one end of which is connected to an energy liquid reflux port provided in the energy liquid storage tank (12); A reflux valve (25) has one end connected to the other end of the reflux regulating valve (24), and the other end of the reflux valve (25) is connected to the output end of the variable frequency pump (20).

5. The energy liquid delivery and distribution system according to any one of claims 1 to 3, characterized in that: The output branch comprises: An orifice plate, one end of which is connected to the output end of the variable frequency pump (20); A branch valve has one end connected to the other end of the orifice plate, and the other end of the branch valve is connected to the energy liquid input port of the test piece.

6. The energy liquid delivery and distribution system according to any one of claims 1 to 3, characterized in that: The gas extrusion subsystem comprises: A pressurized gas supply structure (48) adapted to provide pressurized gas; A plurality of boost valves, one end of which is connected to the boost gas supply structure; One end of a plurality of flow limiting elements is respectively connected to the other end of a plurality of pressure boosting valves, and the other end of the plurality of flow limiting elements is connected to the energy liquid storage tank (12); the gas extrusion subsystem is suitable for opening at least one pressure boosting valve by combination to adjust the extrusion force.

7. The energy liquid delivery and distribution system according to any one of claims 1 to 3, characterized in that: A branch flow meter is provided on the output branch.

8. The energy liquid delivery and distribution system according to any one of claims 1 to 3, characterized in that: A branch pressure sensor is provided on the output branch.

9. The energy liquid delivery and distribution system according to any one of claims 1 to 3, characterized in that: Also includes: A discharge pipeline is connected to the output end of the variable frequency pump (20), and a discharge valve (29) is provided on the discharge pipeline.

10. The energy liquid delivery and distribution system according to any one of claims 1 to 3, characterized in that: The pipelines of the energy liquid delivery and distribution system are located on the same horizontal plane.

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