Rocket engine fuel gas collecting device

Abstract

The invention discloses a rocket engine gas collecting device and belongs to the field of engine gas performance testing. The system comprises a pipeline system and a control system, the pipeline system is used for realizing the functions of vacuumizing a storage tank, emptying air in a gas inlet pipeline, blowing off impurity gas in the pipeline and collecting and transferring fuel gas; the control system comprises a control box, an industrial personal computer and a feedback pressure gauge. The cooling loop comprises a water tank, a water outlet path, a water pump, a water inlet path and a condensation pipe, and the cooling loop is formed by achieving the cooling function of high-temperature fuel gas in the gas inlet pipeline. The condensation pipe is used for cooling high-temperature fuel gas in the gas inlet pipeline. According to the gas collection device, opening and closing of the two high-temperature pneumatic valves are controlled through a PLC program to achieve gas collection, gas is firstly emptied and then collected after being condensed and filtered, and the collected gas amount is controlled based on pressure and time feedback. The control box controls strong current and weak current of the collection system, a built-in PLC system realizes programmable control, and remote operation of the gas collection process is realized.

Description

Technical Field

[0001] The present invention relates to a gas collection device for a rocket engine, belonging to the field of engine gas performance testing. Background Art

[0002] Accurately grasping the gas components after the combustion of the propellant is very important for improving the energy performance of the propellant and establishing a thermodynamic parameter database of the propellant gas. Therefore, it is necessary to efficiently analyze the gas components at different positions of the engine, which is very necessary for establishing the combustion thermodynamics model and chemical reaction kinetics model of the rocket engine. Non-contact on-line testing of engine gas components has high costs and complex technologies, and special designs for the engine combustion chamber and nozzle are also required. Moreover, when there are gas impurities at high temperatures and pressures, optical observation means are no longer applicable. Designing an efficient engine gas collection device, connecting the device to different position measuring points of the engine can quickly collect gas for component analysis. The gas of a rocket engine, especially the gas of a multi-component propellant, has the characteristics of high temperature, high flow rate, and complex composition. The combustion chamber is at high temperature and high pressure, while the nozzle presents a large pressure gradient. The gas temperature at the inlet of the engine nozzle is high, and conventional pipeline valves cannot withstand it; the pressure at the supersonic nozzle of the engine is low, and it is difficult to input gas; the working time of the solid engine is short, and it is difficult to control the gas collection process; the gas of the solid engine is a two-phase flow, and it is difficult to seal the pipeline valve; there are impurities in the gas path of the gas storage tank and pipeline, and the collected gas is impure; the air pressure in the storage tank is low, and it is difficult to transfer the collected gas. Therefore, designing a program-controlled gas collection device to collect the gas of the engine combustion chamber and nozzle for component analysis is very crucial for low-cost and high-efficiency analysis of the engine and propellant performance. Summary of the Invention

[0003] In order to collect the gas at different positions of the rocket engine and provide samples for component analysis, performance detection, etc., the purpose of the present invention is to provide a gas collection device for a rocket engine. The gas collection device realizes gas collection by controlling the opening and closing of two high-temperature pneumatic valves through a PLC program. After condensation and filtration, the gas is first emptied and then collected, and the collected gas volume is controlled based on pressure and time feedback. The present invention can adapt to the interior ballistics of the engine to carry out program-controlled collection of the gas in the rocket engine combustion chamber and nozzle.

[0004] The purpose of the present invention is achieved through the following technical solutions.

[0005] A gas collection device for a rocket engine disclosed by the present invention includes a pipeline system and a control system. The pipeline system includes a push rod motor, a piston, a thermometer, a pressure gauge, a storage tank, a first manual valve, a second manual valve, a gas storage bag, a third manual valve, a vacuum pump, a compressor, a wafer check valve, an exhaust path outlet, a second pneumatic ball valve, a water tank, a water outlet path, a water pump, a water inlet path, a condenser tube, an intake pipeline, an exhaust inlet pipeline, a vacuum extraction inlet pipeline, a transfer path pipeline, a second pneumatic ball valve supply hose, a first pneumatic ball valve supply hose, a purging path intake pipeline, and a first pneumatic ball valve. The pipeline system is used to achieve functions such as vacuum pumping of the storage tank, air evacuation of the intake pipeline, impurity gas purging of the pipeline, gas collection, and transfer.

[0006] The control system includes a control box, an industrial computer, and a feedback pressure gauge.

[0007] The cooling circuit includes a water tank, a water outlet path, a water pump, a water inlet path, and a condenser tube, which realizes the cooling function of the high-temperature gas in the intake pipeline to form a cooling circuit. The condenser tube is used to cool the high-temperature gas in the intake pipeline. Preferably, the high and low temperature cooling water circuits include a high-temperature cooling circuit and a low-temperature cooling circuit. The high-temperature cooling circuit uses countercurrent heat exchange in the cooling water circuit, including components such as a condenser tube, a filter, and a heat dissipation tube. Among them, the condenser tube is of a sleeve structure, with the inner tube for gas flow and the outer tube for reverse water flow to achieve gas cooling. Since the gas of a solid rocket engine has many impurities, the filter not only collects condensate particles but also enhances heat dissipation and removes particulate matter to prevent agglomerated particulate matter from clogging valves and pipelines, affecting the airtightness and collection function of the device. The low-temperature cooling circuit uses sleeve cooling. Considering the low pressure and high flow rate in the low-temperature area (such as the nozzle expansion section), no heat dissipation elbow and filter are added to prevent excessive pipeline damping from affecting gas collection.

[0008] The vacuum pumping path includes a vacuum extraction inlet pipeline, a transfer pipeline, a first manual valve, a second manual valve, and a vacuum pump. The vacuum pumping path is connected to the storage tank to pump out the air in the storage tank to reach a vacuum state.

[0009] The exhaust path includes an intake pipeline, an exhaust inlet pipeline, a second pneumatic ball valve, and an exhaust path outlet. The gas in the combustion chamber passes through the exhaust path to discharge the air in the intake pipeline from the exhaust path outlet, realizing the exhaust function.

[0010] The purging path includes a compressor, a purging path intake pipeline, and a wafer check valve. The pressure source formed by the compressor presses the gas into the pipeline to purge the impurities in the pipeline.

[0011] The gas collection path includes a storage tank, an intake pipeline, and a first pneumatic ball valve. The gas in the combustion chamber enters the storage tank in sequence through the pipeline and the valve.

[0012] The transfer path includes a vacuum inlet pipe, a first manual valve, a transfer path pipe, a second manual valve, and a gas storage bag. The fuel gas is transferred from the storage tank to the gas storage bag through the pipe.

[0013] The control system includes a control box, an industrial control board, and a pressure gauge. Local control is achieved by using the start / stop buttons on the control box that include a first pneumatic ball valve, a second pneumatic ball valve, a water pump, a compressor, a vacuum pump, and a push rod motor. The industrial control board includes a program setting and interaction interface for the gas collection device.

[0014] The control system includes a control box. The internal part of the control box uses a PLC to achieve strong and weak electricity control, and the industrial control board remotely sets the working mode of the collection device.

[0015] Preferably, the internal part of the control box contains 220V alternating current to supply power to devices such as the compressor, vacuum pump, and water pump of the device. The internal part of the control box also includes 24V and ±12V direct current to supply power to temperature and pressure sensors. Among them, the PLC sensor signals inside the control box are collected by the PLC, and the PLC arranges opening and closing point buttons to achieve remote triggering. A digital display meter is built into the control box panel to locally display the pressure and temperature values. A strong electricity button is set to locally control the start and stop of the pump. A pneumatic valve button is set locally to achieve local opening and closing in three gears: manual, automatic, and stop. The automatic stage realizes remote program control for collection.

[0016] Preferably, the industrial control board is built with an interaction interface for the gas collection path to set the collection working logic. At the same time, the pressure and temperature values inside the gas tank are displayed in real time on the industrial control board interface.

[0017] Preferably, the feedback control loop means that the pressure sensor transmits the signal back to the PLC, and the PLC judges the working logic according to the signal to realize the start and stop of the pneumatic valve; the feedback control loop includes an engine combustion chamber feedback loop and a gas storage tank feedback loop; the engine combustion chamber feedback loop is used to realize gas collection under the rated pressure; the gas storage tank feedback loop is used to realize the stop of gas collection under the specified pressure of the gas storage tank.

[0018] Furthermore, the condensed water in the cooling loop enters the condensing pipe through the water pump to form a countercurrent forced heat exchange to enhance the cooling effect of the fuel gas.

[0019] Furthermore, the vacuum pumping path uses a vacuum pump to evacuate the air in the storage tank so that the vacuum degree reaches -0.1, that is, the pressure gauge shows -0.1. When pumping vacuum, operate the control box, the first pneumatic ball valve is closed, the second manual valve is opened, and the third manual valve is in the open state. The air in the storage tank, gas storage bag, and connected pipes is evacuated through vacuum pumping to ensure the purity of the gas collection. The pressure difference formed between the vacuum in the storage tank and the outside can enable the gas in the combustion chamber, especially the low-pressure gas in the expansion section of the nozzle, to enter the storage tank under the action of the pressure difference.

[0020] Further, the evacuation path utilizes the gas in the combustion chamber to discharge the air therein through the intake pipe, the evacuation inlet, and the evacuation path outlet to ensure the purity of the collected gas. The evacuation path outlet is perpendicular to the water surface of the water tank to prevent the high-temperature gas from damaging other structures. When evacuating, the first pneumatic ball valve is closed, the second pneumatic ball valve is opened, and the wafer check valve is closed.

[0021] Further, the gas collection path allows the gas in the combustion chamber to enter the storage tank under the action of pressure difference. During this process, the first manual valve, the second manual valve, and the third manual valve are closed, and the second pneumatic ball valve is closed under program control.

[0022] Further, the transfer path transfers the cooled gas in the storage tank to the gas storage bag. At this time, the first pneumatic ball valve is closed to prevent the gas in the storage tank from leaking, and the third manual valve is closed to prevent the gas from entering the vacuum pump. The second manual valve is opened, and the gas enters the gas storage bag under the action of pressure difference. When the pressure difference is insufficient, the push rod motor is advanced using the control box, and the gas is pushed from the storage tank into the gas collection bag under the action of the piston.

[0023] Further, for the purging path, after the test is completed, the gas collection bag is removed. The first pneumatic ball valve, the second pneumatic ball valve, the first manual valve, the second manual valve, and the third manual valve are in the open state. When the wafer check valve is opened, the air in the compressor passes through the pipeline of the collective device under the action of the pressure difference to purge the solid impurities in the pipeline.

[0024] A gas collection device for a rocket engine disclosed by the present invention has a working method including the following steps:

[0025] Step 1: Preparation before gas collection

[0026] The purpose of vacuum pumping is to evacuate the air in the gas storage tank to ensure the gas purity. First, turn the pneumatic valve knob of the control box to manual, close the second pneumatic ball valve, and close the first pneumatic ball valve. Open the third manual valve to connect the vacuum pump path, open the second manual valve to connect the gas collection path, and open the first valve to connect the gas storage tank. Close the wafer check valve of the purging path to cut off the compressor path. Then rotate the vacuum pump start knob on the control box to start vacuum pumping. When the middle digital display shows -0.1, first close the second manual valve, then close the first manual valve. Subsequently, close the third manual valve, and finally close the vacuum pump to complete vacuum pumping. Use the control box to turn on the cooling water circulation pump of the vacuum water pump to start the water circulation of the cooling loop.

[0027] Step 2: Setting the gas collection program

[0028] Relying on the industrial control computer program to set the gas collection parameters. When the pressure in the combustion chamber reaches p 1 MPa and after t 1 s, the second pneumatic ball valve is opened to start evacuation. Evacuate for t 2After s, the second pneumatic valve ball closes, stopping the evacuation. The first pneumatic ball valve opens, and gas begins to enter the storage tank from the combustion chamber. When the pressure in the storage tank exceeds p 2 MPa, or the gas collection time exceeds t 3 s, stop gas collection and close the first pneumatic valve ball.

[0029] Step Three: Gas Collection

[0030] Complete the gas collection according to the program set by the industrial control computer

[0031] Step Four: Gas Transfer

[0032] Gas transfer refers to the process of transferring the gas from the gas storage tank to the gas storage bag after gas collection. First, close the first pneumatic ball valve and the second pneumatic ball valve and switch to the manual mode. Then confirm that the first manual valve, the second manual valve, and the third manual valve are closed. Open the first manual valve and the second manual valve, and the gas enters the gas collection bag. After the gas storage is completed, close the second manual valve and the first manual valve, and replace the gas storage bag. After replacing the gas storage bag, first evacuate the gas storage bag with the first manual valve closed. Then close the third manual valve and the second manual valve. If the pressure is not enough to make the gas enter the gas storage bag at this time, open the first manual valve and the second manual valve, and click the piston forward button on the control box. The piston will push the remaining gas in the gas storage tank into the gas collection bag. Close the second manual valve and the first manual valve, and remove the gas storage bag to complete the gas storage.

[0033] Step Five: System Cleaning

[0034] Blow - off cleaning is an operation after the experiment. The purpose is to blow off the residual gas inside the system. The main steps are as follows: close the third manual valve, cut off the vacuum pump line, open the first manual valve, open the gas storage tank line, open the second manual valve (the gas collection bag has been removed), open the second pneumatic ball valve, open the first pneumatic ball valve. Finally, open the blow - off clamp ball valve. The air in the compressor continuously passes through the system, and finally blows off the residual gas and impurities in the pipeline of the gas collection device.

[0035] Beneficial Effects:

[0036] 1. A gas collection device for a rocket engine disclosed by the present invention. The gas collection device controls the opening and closing of two high-temperature pneumatic valves through a PLC program to achieve gas collection. The gas is first exhausted and then collected after condensation and filtration, and the collected gas volume is controlled based on pressure and time feedback. It mainly includes three parts: a collection system, a control box, and an industrial control board. The collection system is mainly used for functions such as gas cooling, collection, purging, and storage. The control box controls the strong and weak electricity of the collection system, and an internal PLC system is used to achieve programmable control. It can control the on-off of the vacuum pump, the cooling water pump, and the start and stop of the piston motor. The stroke of the piston is displayed in real time by a laser distance sensor installed on the piston, and the upper and lower stroke limits are set. The control box includes manual and automatic modes. In the manual mode, it can also control the opening and closing of the first pneumatic valve and the second pneumatic valve to complete the purging function. In the automatic mode, it executes the program set by the industrial control board to complete the gas collection program. A digital display meter for the pressure and temperature of the gas storage tank and a digital display meter for the piston stroke are placed on the control box. The industrial control board is connected to the PLC through a network cable to achieve remote operation of the gas collection process. The present invention can carry out high-temperature and high-speed gas program-controlled collection work according to the internal ballistics of the engine.

[0037] 2. A gas collection device for a rocket engine disclosed by the present invention. The industrial control board and the experimental device are connected through a network cable to achieve remote collection control.

[0038] 3. A gas collection device for a rocket engine disclosed by the present invention. By optimizing the overall structure design of the pipeline, the gas collection pipeline can ensure the realization of functions such as gas collection, purging, transfer, and evacuation, and improve the purity of the collected gas.

[0039] 4. A gas collection device for a rocket engine disclosed by the present invention. The control box panel integrates the strong and weak electricity control of the device, and displays the pressure and temperature in real time to ensure on-site processing and control of the collection system.

[0040] 5. A gas collection device for a rocket engine disclosed by the present invention. Based on the high and low temperature cooling circuits, the gas collection device can collect the high-temperature gas in the rocket engine.

[0041] 6. A gas collection device for a rocket engine disclosed by the present invention. The use of the program logic and pressure feedback control of the industrial control board enables the collection process to adapt to the internal ballistics of the engine operation.

[0042] 7. A gas collection device for a rocket engine disclosed by the present invention solves the problem that the conventional pipeline valves are difficult to withstand the high gas temperature at the inlet of the engine nozzle through a condensing pipe, solves the problem that it is difficult to input gas due to the low supersonic pressure in the expansion section of the engine nozzle by evacuating the gas storage tank, solves the problem that it is difficult to control the gas collection process due to the short working time of the solid engine through PLC program control, selects pneumatic ball valves for the collection path valves to solve the problem of difficult sealing of pipeline valves for the two-phase flow of the solid engine gas, evacuates the gas storage tank and the pipeline gas path on the one hand before gas collection and purges the pipeline with gas on the other hand to solve the problem of impure gas collection due to impurities in the gas storage tank and the pipeline gas path, and solves the problem of difficult transfer of the collected gas due to the low pressure in the storage tank by pushing the gas into the gas storage tank with a piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a schematic diagram of a gas collection device for a rocket engine;

[0044] Figure 2 is a parameter setting diagram of an industrial control board;

[0045] Figure 3 is a working method diagram of the gas collection device.

[0046] Among them, 1 - push rod motor, 2 - piston, 3 - thermometer, 4 - pressure gauge, 5 - storage tank, 6 - first hand valve, 7 - second hand valve, 8 - gas storage bag, 9 - third hand valve, 10 - vacuum pump, 11 - compressor, 12 - wafer check valve, 13 - evacuation path outlet, 14 - second pneumatic ball valve, 15 - water tank, 16 - water outlet path, 17 - water pump, 18 - water inlet path, 19 - condensing pipe, 20 - intake pipeline, 21 - evacuation inlet pipeline, 22 - vacuum inlet pipeline, 23 - transfer path pipeline, 24 - second pneumatic ball valve supply hose, 25 - first pneumatic ball valve supply hose, 26 - purge path intake pipeline, 27 - first pneumatic ball valve, 28 - control box, 29 - industrial control computer, 30 - feedback pressure gauge. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] In order to better illustrate the purpose and advantages of the present invention, the following further describes the content of the invention with reference to the drawings and examples.

[0048] Example 1:

[0049] As Figure 1As shown in the figure, a gas collection device for a rocket engine disclosed in this embodiment, a gas collection device for a rocket engine, includes a pipeline system and a control system. The pipeline system includes a push rod motor 1, a piston 2, a thermometer 3, a pressure gauge 4, a storage tank 5, a first manual valve 6, a second manual valve 7, a gas storage bag 8, a third manual valve 9, a vacuum pump 10, a compressor 11, a wafer check valve 12, an exhaust path outlet 13, a second pneumatic ball valve 14, a water tank 15, a water outlet path 16, a water pump 17, a water inlet path 18, a condenser pipe 19, an intake pipe 20, an exhaust inlet pipe 21, a vacuum inlet pipe 22, a transfer path pipe 23, a second pneumatic ball valve supply hose 24, a first pneumatic ball valve supply hose 25, a purging path intake pipe 26, and a first pneumatic ball valve 27. The pipeline system is used to achieve functions such as evacuating the storage tank, exhausting air from the intake pipe, purging impurity gases in the pipeline, collecting and transferring gas. The control system includes a control box 28, an industrial control computer 29, and a feedback pressure gauge 30.

[0050] The cooling circuit includes a water tank 15, a water outlet path 16, a water pump 17, a water inlet path 18, and a condenser pipe 19, which realizes the cooling function of the high-temperature gas in the intake pipe 20 to form a cooling circuit. The condenser pipe 19 is used to cool the high-temperature gas in the intake pipe 20.

[0051] The vacuum path includes a vacuum inlet pipe 22, a transfer pipe 23, a first manual valve 6, a second manual valve 27, and a vacuum pump 10. The vacuum path is connected to the storage tank 5 to evacuate the air in the storage tank to a vacuum state.

[0052] The exhaust path includes an intake pipe 20, an exhaust inlet pipe 21, a second pneumatic ball valve 14, and an exhaust path outlet 13. The gas in the combustion chamber passes through the exhaust path to discharge the air in the intake pipe 20 from the exhaust path outlet 13 to achieve the exhaust function.

[0053] The purging path includes a compressor 11, a purging path intake pipe 26, and a wafer check valve 12. The pressure source formed by the compressor 11 presses the gas into the pipeline to purge the impurities in the pipeline.

[0054] The gas collection path includes a storage tank 5, an intake pipe 20, and a first pneumatic ball valve 27. The gas in the combustion chamber enters the storage tank 5 after passing through the pipeline and valves in sequence.

[0055] The transfer path includes a vacuum inlet pipe 22, a first manual valve 6, a transfer path pipe 23, a manual valve 27, and a gas storage bag 8. The gas is transferred from the storage tank 5 to the gas storage bag 8 through the pipeline.

[0056] The control system includes a control cabinet 28, an industrial control board 29, and a pressure gauge 30. Local control is achieved by using the start-stop buttons on the control cabinet that include the first pneumatic ball valve 14, the second pneumatic ball valve 15, the water pump 17, the air compressor 11, the vacuum pump 10, and the push rod motor 1. The industrial control board 29 includes a program setting and interaction interface for the gas collection device.

[0057] Further, the condensed water in the cooling circuit enters the condensation pipe 19 through the water pump to form countercurrent forced heat exchange, enhancing the gas cooling effect.

[0058] Further, in the vacuum pumping path, the vacuum pump 10 is used to pump out all the air in the storage tank 5, so that the vacuum degree reaches -0.1, that is, the reading of the pressure gauge 4 is -0.1. When pumping vacuum, the control cabinet 29 is operated, the first pneumatic ball valve 14 is closed, the second manual valve 7 is opened, and the third manual valve 9 is in the open state. All the air in the storage tank 5, the gas storage bag 8, and the connected pipelines is pumped out through vacuum pumping to ensure the purity of the collected gas. The pressure difference formed between the vacuum in the storage tank 5 and the outside can cause the gas in the combustion chamber, especially the low-pressure gas in the expansion section of the nozzle, to enter the storage tank 5 under the action of the pressure difference.

[0059] Further, in the evacuation path, the air in the combustion chamber is discharged through the gas inlet pipe 20, the evacuation inlet 21, and the evacuation path outlet 13 to ensure the purity of the collected gas. The evacuation path outlet 13 is perpendicular to the water surface of the water tank 15 to prevent high-temperature gas from damaging other structures. When evacuating, the first pneumatic ball valve 27 is closed, the second pneumatic ball valve 14 is opened, and the wafer check valve 12 is closed.

[0060] Further, in the gas collection path, the gas in the combustion chamber enters the storage tank 5 under the action of the pressure difference. During this process, the first manual valve 6, the second manual valve 7, and the third manual valve 9 are closed, and the second pneumatic ball valve 14 is closed under program control.

[0061] Further, in the transfer path, the cooled gas in the storage tank is transferred to the gas storage bag. At this time, the first pneumatic ball valve 27 is closed to prevent the gas in the storage tank from leaking, and the third manual valve 9 is closed to prevent the gas from entering the vacuum pump 10. The second manual valve 7 is opened, and the gas enters the gas storage bag under the action of the pressure difference. When the pressure difference is insufficient, the push rod motor 1 is advanced by using the control box 2, and under the action of the piston 2, the gas is pushed from the storage tank 5 into the gas collection bag.

[0062] Further, in the purging path, after the gas storage bag 8 is removed after the test, the first pneumatic ball valve 27, the second pneumatic ball valve 14, the first manual valve 6, the second manual valve 7, and the third manual valve 9 are in the open state. When the wafer check valve 12 is opened, the air in the air compressor 11 passes through the pipelines of the collective device under the action of the pressure difference to purge the solid impurities in the pipeline.

[0063] As Figure 2A rocket engine gas collection pipeline and program control system disclosed in the present embodiment. The industrial control board can set the collection time. The combustion chamber pressure is displayed at the combustion chamber icon, and the pressure at which collection starts and the delay time are set. The icon at the pneumatic valve 2 can set the opening time of the evacuation path. The pressure and temperature in the storage tank can be displayed in real time at the storage tank. Set the collection time and the maximum pressure that the storage tank can withstand. When the pressure is reached, the pneumatic valve closes.

[0064] As Figure 3 A rocket engine gas collection and program control system disclosed in the present embodiment. During the working process of the collection device, before collection, the storage tank is evacuated, the compressor is turned on to supply air to the pneumatic valve, and the water pump cooling cycle is started. Subsequently, the working program of the system is set remotely, and the system executes the program to perform pipeline evacuation and gas collection operations, and finally closes the valve. After collection ends, the gas is transferred to the gas storage bag, the pipeline is purged using the gas in the compressor, and finally the pipeline is cleaned.

[0065] A rocket engine gas collection device disclosed in the present embodiment. The working method includes the following steps:

[0066] Step 1: Preparation before gas collection

[0067] The purpose of evacuation is to remove the air in the storage tank to ensure gas purity. First, turn the pneumatic valve knob of the control box to manual, close the second pneumatic ball valve 14, and close the first pneumatic ball valve 27. Open the third hand valve 9 to connect the vacuum pump path, open the second hand valve 7 to connect the gas collection path, and open the first valve 6 to connect the storage tank. Close the pinch valve 12 of the purge path to cut off the compressor path. Then rotate the vacuum pump start knob on the control box to start evacuation. When the middle digital display shows -0.1, first close the second hand valve 14, then close the first hand valve 27. Subsequently, close the third hand valve 9, and finally close the vacuum pump 10 to complete evacuation. Use the control box 28 to turn on the cooling water circulation pump 17 of the vacuum water pump to start the water circulation in the cooling circuit.

[0068] Step 2: Setting of gas collection program

[0069] Rely on Figure 2 The industrial control computer 29 programs to set the gas collection parameters. When the combustion chamber pressure reaches p 1 MPa and after t 1 s, the second pneumatic ball valve 14 opens to start evacuation. After evacuating for t 2 s, the second pneumatic ball valve 14 closes to stop evacuation, and the first pneumatic ball valve 27 opens, and the gas starts to enter the storage tank 5 from the combustion chamber. When the pressure in the storage tank 5 exceeds p 2 MPa, or when the gas collection time exceeds t 3 s, stop gas collection, and the first pneumatic valve ball 27 closes.

[0070] Step 3: Gas collection

[0071] Complete the gas collection according to the program set by the industrial control computer

[0072] Step 4: Gas transfer

[0073] Gas transfer refers to the process of transferring the gas from the gas storage tank to the gas storage bag 8 after gas collection. First, close the first pneumatic ball valve 27 and the second pneumatic ball valve 14 and switch to the manual mode. Then confirm that the first manual valve 6, the second manual valve 7 and the third manual valve 9 are closed. Open the first manual valve 6, and open the second manual valve 7 so that the gas enters the gas collection bag. After the gas storage is completed, close the second manual valve 7 and the first manual valve 6, and replace the gas storage bag 8. After replacing the gas storage bag 8, first evacuate the gas storage bag 8 with the first manual valve 6 closed. Then close the third manual valve 9 and the second manual valve 7. If the pressure is not enough to make the gas enter the gas storage bag at this time, open the first manual valve 6 and the second manual valve 7, and click the piston forward button on the control box. The piston 2 will push the remaining gas in the gas storage tank into the gas collection bag. Close the second manual valve 7 and the first manual valve 6, remove the gas storage bag 8 to complete the gas storage. Finally, blow the system.

[0074] Step 5: System cleaning

[0075] Blowing and cleaning is an operation after the experiment, aiming to blow the residual gas inside the system. The main steps are as follows: close the third manual valve 9 to cut off the vacuum pump path, open the first manual valve 6 to open the gas storage tank path, open the second manual valve 7 with the gas collection bag removed, open the second pneumatic ball valve 14, open the first pneumatic ball valve 27, and finally open the blow-off check valve 12. The air in the compressor 11 continuously passes through the system to blow the residual gas and impurities in the gas collection pipeline.

[0076] The above specific description further details the purpose, technical solution and beneficial effects of the invention. It should be understood that the above is only a specific embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rocket engine gas collection device, characterized in that: The invention comprises a pipeline system and a control system; the pipeline system comprises a push rod motor (1), a piston (2), a temperature gauge (3), a pressure gauge (4), a storage tank (5), a first hand valve (6), a second hand valve (7), an air storage bag (8), a third hand valve (9), a vacuum pump (10), an air compressor (11), a clamped ball valve (12), an emptying outlet (13), a second pneumatic ball valve (14), a water tank (15), a water outlet (16), a water pump (17), a water inlet (18), a condenser (19), an air inlet pipeline (20), an emptying inlet pipeline (21), a vacuum inlet pipeline (22), a transfer pipeline (23), a second pneumatic ball valve air supply hose (24), a first pneumatic ball valve air supply hose (25), a blow-off inlet pipeline (26), and a first pneumatic ball valve (27); the pipeline system is used to realize the functions of vacuuming the storage tank, emptying the air from the air inlet pipeline, blowing off impurity gases from the pipeline, and collecting and transferring fuel gas; The control system comprises a control box (28), an industrial computer (29), and a feedback pressure gauge (30); The cooling circuit comprises a water tank (15), a water outlet (16), a water pump (17), a water inlet (18), and a condenser (19), which realizes the cooling function of the high-temperature combustion gas in the intake pipe (20) to form a cooling circuit; the condenser (19) is used to cool the high-temperature combustion gas in the intake pipe (20); the condenser is used to cool the high-temperature combustion gas in the intake pipe; The vacuum pumping circuit comprises a vacuum pumping inlet pipe (22), a transfer pipe (23), a first manual valve (6), a manual valve 2 (7) and a vacuum pump (10). The vacuum pumping circuit is connected to the storage box (5) to pump out the air in the storage box to achieve a vacuum state. The exhaust path comprises an air intake pipe (20), an exhaust inlet pipe (21), a second pneumatic ball valve (14) and an exhaust path outlet (13); the combustion gas in the combustion chamber passes through the exhaust path to discharge the air in the air intake pipe (20) from the exhaust path outlet (13), thereby achieving an exhaust function; The blow-off path comprises a compressor (11), a blow-off path air inlet pipeline (26) and a sandwich ball valve (12); the pressure source formed by the compressor (11) presses gas into the pipeline to blow off impurities in the pipeline; The gas collecting path comprises a storage box (5), an air intake pipeline (20) and a first pneumatic ball valve (27); the gas in the combustion chamber passes through the pipeline and the valve in sequence and then enters the storage box (5); The transfer path comprises a vacuum inlet pipeline (22), a first manual valve (6), a transfer path pipeline (23), a manual valve 2 (7), and a gas storage bag (8); the gas is transferred from the storage box (5) to the gas storage bag (8) via the pipeline; The control system comprises a control box (28), an industrial control panel (29) and a pressure gauge (30), and local control is achieved by using the start / stop buttons on the control box, which contain a first pneumatic ball valve (14), a second pneumatic ball valve (15), a water pump (17), an air compressor (11), a vacuum pump (10) and a push rod motor (1); the industrial control panel (29) comprises a program setting interactive interface for the gas collection device.

2. A rocket engine gas collection device as claimed in claim 1, characterized in that: The condensed water in the cooling circuit enters the condenser pipe (19) through a water pump to form a countercurrent forced heat exchange to enhance the cooling effect of the fuel gas.

3. A rocket engine gas collection device as claimed in claim 2, characterized in that: The vacuum pump (10) is used to evacuate the air in the storage box (5) so that the vacuum degree reaches -0.1, that is, the pressure gauge (4) indicates -0.

1. When evacuating the air, the control box (29) is operated, the first pneumatic ball valve (14) is closed, the second hand valve (7) is opened, and the third hand valve (9) is opened. The air in the storage box (5), the air storage bag (8) and the connected pipeline is evacuated by evacuating the air, thereby ensuring the purity of the collected gas. The pressure difference between the vacuum of the storage box (5) and the outside world can enable the gas in the combustion chamber, especially the low-pressure gas in the nozzle expansion section, to enter the storage box (5) under the action of the pressure difference.

4. A rocket engine gas collection device as claimed in claim 3, characterized in that: The exhaust path uses the combustion chamber gas to exhaust the air therein through the intake pipe (20), the exhaust inlet (21) and the exhaust path outlet (13) to ensure the purity of the collected gas, wherein the exhaust path outlet (13) is perpendicular to the water surface of the water tank (15) to prevent the high-temperature gas from damaging other structures; during exhaust, the first pneumatic ball valve (27) is closed, the second pneumatic ball valve (14) is opened, and the sandwich ball valve (12) is closed.

5. A rocket engine gas collection device as claimed in claim 4, characterized in that: The gas collecting path uses the pressure difference to let the gas in the combustion chamber enter the storage box (5). During the process, the first hand valve (6), the second hand valve (7) and the third hand valve (9) are closed, and the second pneumatic ball valve (14) is closed under program control.

6. A rocket engine gas collection device as claimed in claim 5, characterized in that: The transfer path transfers the cooled gas in the storage tank to the gas storage bag. At this time, the first pneumatic ball valve (27) is closed to prevent the gas in the storage tank from leaking out, and the third hand valve (9) is closed to prevent the gas from entering the vacuum pump (10). The second hand valve (7) is opened to allow the gas to enter the gas storage bag under the action of the pressure difference. When the pressure difference is insufficient, the control box (2) is used to move the push rod motor (1) forward, and the gas is pushed from the storage tank (5) into the gas collection bag under the action of the piston (2).

7. A rocket engine gas collection device as claimed in claim 6, characterized in that: In the blowing-off path, after the test is completed, the air collecting bag (8) is removed, and the first pneumatic ball valve (27), the second pneumatic ball valve (14), the first hand valve (6), the second hand valve (7) and the third hand valve (9) are in an open state; when the clamped ball valve (12) is opened, the air in the compressor (11) passes through the pipeline of the collective device under the action of the pressure difference, thereby blowing off the solid impurities in the pipeline.

8. A rocket engine gas collection device as claimed in claim 6, characterized in that: The high and low temperature cooling water circuits include a high temperature cooling circuit and a low temperature cooling circuit. The high temperature cooling circuit is a cooling water circuit that adopts countercurrent heat exchange, and includes components such as condensers, filters, and heat dissipation pipes. The condenser is a sleeve structure, with the inner tube conducting air and the outer tube conducting water in the reverse direction to achieve cooling of the fuel gas. Since there are many impurities in the fuel gas of solid engines, the filter can be used to collect condensed particles while also enhancing heat dissipation, removing particles to prevent agglomerated particles from clogging valves and pipes and affecting the air tightness and collection function of the device. The low temperature cooling circuit uses sleeve cooling, and considering the low pressure and fast flow rate in the low temperature zone, no heat dissipation elbows and filters are added to prevent excessive pipeline damping from affecting fuel gas collection.

9. A rocket engine gas collection device as claimed in claim 6, characterized in that: The control box contains 220V AC power to power the compressor, vacuum pump, water pump and other equipment; the control box also contains 24V and ±12V DC power to power the temperature and pressure sensors; the control box has a built-in PLC sensor signal which is collected by the PLC, and at least the PLC arranges the opening and closing point buttons to achieve remote triggering; the control box panel has a built-in digital display to display the pressure and temperature values ​​locally; a strong power button is set to control the start and stop of the pump locally; the pneumatic valve button is set to manual, automatic and stop in three gears to achieve local opening and closing; the automatic stage can achieve remote program control; The industrial control board has a built-in interactive interface for collecting gas circuits, which is used to set the collection working logic; at the same time, the industrial control board interface displays the pressure and temperature values ​​in the gas tank in real time; The feedback control loop refers to the pressure sensor transmitting signals back to the PLC, and the PLC judges the working logic based on the signals to realize the start and stop of the pneumatic valve; the feedback control loop includes the engine combustion chamber feedback loop and the gas tank feedback loop; the engine combustion chamber feedback loop is used to realize gas collection under rated pressure; the gas tank feedback loop is used to realize the stop of gas collection under the specified pressure of the gas tank.

10. A rocket engine gas collection device as claimed in claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, characterized in that: The working method includes the following steps: Step 1: Preparation before gathering gas The purpose of vacuuming is to extract the air in the gas storage tank to ensure the purity of the gas. First, adjust the pneumatic valve knob of the control box to manual, close the second pneumatic ball valve (14), and close the first pneumatic ball valve (27); open the third manual valve (9), the vacuum pump path is open, open the second manual valve (7) to open the gas collection path, open the first opening valve (6) to open the gas storage tank; close the blow-off path clamp ball valve (12) to cut off the compressor path; then rotate the vacuum pump start knob on the control box to start vacuuming; when the middle digital display number is -0.1, first close the second manual valve (14), then close the first manual valve (27); then close the third manual valve (9), and finally close the vacuum pump (10) to complete the vacuuming; use the control box (28) to open the vacuum water pump cooling circulation water pump (17) to start the cooling circuit water circulation; Step 2: Set up the gas collection program The gas collection parameters are set by means of an industrial control computer (29). When the pressure in the combustion chamber reaches p1MPa and t1s has passed, the second pneumatic ball valve (14) opens and starts to be emptied. After t2s of emptying, the second pneumatic valve ball (14) closes and the emptying stops. The first pneumatic ball valve (27) opens and the gas starts to flow from the combustion chamber into the storage tank (5). When the pressure in the storage tank (5) exceeds p2MPa or the gas collection time exceeds t3s, the gas collection stops and the first pneumatic valve ball (27) closes. Step 3: Gas Collection Complete gas collection according to the program set by the industrial computer Step 4: Gas Transfer Gas transfer refers to the process of transferring the gas from the gas storage tank to the gas storage bag (8) after the gas collection is completed. First, close the first pneumatic ball valve (27) and the second pneumatic ball valve (14) and switch to manual mode; then confirm that the first hand valve (6), the second hand valve (7) and the third hand valve (9) are closed; open the first hand valve (6), open the second hand valve (7) and the gas enters the gas collection bag; after the gas storage is completed, close the second hand valve (7) and the first hand valve (6), replace the gas storage bag (8); replace the gas storage bag After the bag (8) is filled, firstly, the air storage bag (8) is evacuated with the first hand valve (6) closed; then, the third hand valve (9) and the second hand valve (7) are closed; if the pressure is not enough to allow the gas to enter the air storage bag, the first hand valve (6) and the second hand valve (7) are opened, and the piston forward button of the control box is clicked, and the piston (2) pushes the remaining gas in the gas storage tank into the air collection bag; the second hand valve (7) and the first hand valve (6) are closed, and the air storage bag (8) is removed to complete the gas storage; finally, the pipeline is blown out; Step 5: System Cleanup Blowing and cleaning is an operation after the experiment is completed. Its purpose is to blow away the residual gas in the system. The main steps are as follows: close the third manual valve (9) to cut off the vacuum pump circuit, open the first manual valve (6) to open the air storage box circuit, open the second manual valve (7) (the air collection bag has been removed), open the second pneumatic ball valve (14), and open the first pneumatic ball valve (27). Finally, open the blow-off clamped ball valve (12), and the air in the compressor (11) will continuously pass through the system to blow away the residual gas and impurities in the pipeline system.

Images