CN110425189B - Ultrahigh-speed turbine pump and overflow valve matching test device - Google Patents
Ultrahigh-speed turbine pump and overflow valve matching test device Download PDFInfo
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- CN110425189B CN110425189B CN201910645884.9A CN201910645884A CN110425189B CN 110425189 B CN110425189 B CN 110425189B CN 201910645884 A CN201910645884 A CN 201910645884A CN 110425189 B CN110425189 B CN 110425189B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/007—Simulation or modelling
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Abstract
A test device for matching of an ultra-high-speed turbine pump and an overflow valve comprises a turbine driving device, a hydraulic system, a computer acquisition and control system and a real-time spectrum analyzer; the turbine driving device is used for driving the turbine pump to work; the hydraulic system is used for providing equivalent simulation load for the ultra-high speed turbine pump; the computer acquisition and control system adjusts the flow of the equivalent simulation load according to the performance requirement, acquires the rotating speed, the vibration quantity of the small shaft end of the rotor and the opening pressure and the self-vibration frequency of the overflow valve in the working process of the ultra-high-speed turbine pump, processes the signals and sends the signals to the real-time spectrum analyzer; a real-time spectrum analyzer: and carrying out frequency spectrum analysis to obtain the dynamic characteristic of the overflow valve and the matching relation between the dynamic characteristic of the overflow valve and the vibration quantity of the rotor. The invention can verify the dynamic characteristic of the overflow valve and the matching coupling relation between the dynamic characteristic of the overflow valve and the vibration quantity of the ultra-high-speed turbine pump.
Description
Technical Field
The invention relates to a matching test device for an ultra-high-speed turbine pump and an overflow valve, which is used for verifying the matching coupling relation between the dynamic performance of the overflow valve and the turbine pump under a high-temperature condition and belongs to the field of hydraulic systems.
Background
The overflow valve is an important pressure control and regulation element in a servo hydraulic system, and as an important control and regulation element of servo energy, the dynamic characteristic, stability and working noise of the overflow valve influence the normal work of the whole servo system. When the overflow valve works at a high temperature, the overflow valve is arranged between the matching surfaces of the valve core and the valve body, and due to inconsistent thermal expansion, phenomena such as valve core locking, inflexible movement or increased leakage amount and the like are easily generated, so that the pressure regulating performance of the overflow valve is unstable, and even the overflow valve cannot work normally. Meanwhile, when the overflow valve is used as a constant pressure valve in a hydraulic system, the pilot valve or the main valve vibrates due to the interference of pressure pulsation and system load fluctuation, so that the system pressure fluctuates near the set pressure. The pressure stability of the overflow valve with large pressure fluctuation is poor, and violent vibration and squeaking sound can be generated when the pressure is serious, so that the system can not work normally. Meanwhile, the vibration generated by the pilot valve or the main valve can adversely affect the oil supply pulsation of the hydraulic pump, so that a turbine pump shaft system generates certain vibration. The overflow valve and the turbine pump are coupled with each other, so that a resonance phenomenon is generated, and the pressure stability of the system is seriously influenced. This is a major problem in hydraulic systems, namely the problem of system pressure stability. Meanwhile, at present, no systematic and complete test method for the dynamic performance of the underflow valve under high-temperature conditions exists in China, and no special research aiming at the aspect exists at present.
When the overflow valve is used as a constant pressure valve, the interference of oil supply pulsation of the hydraulic pump and system load fluctuation causes the vibration of the pilot valve or the main valve, and the system pressure fluctuates around the set pressure. The pressure stability of the overflow valve with large pressure fluctuation is poor, and violent vibration and squeaking sound can be generated when the pressure is serious, so that the system cannot work normally. Meanwhile, the vibration generated by the pilot valve or the main valve can adversely affect the oil supply pulsation of the hydraulic pump, so that a turbine pump shaft system generates certain vibration. In order to improve the pressure stability of the system, the natural frequency of a main valve of the overflow valve must be prevented from being coincident with or integral multiple of the disturbance frequency of the external pressure, and in order to verify the matching coupling relationship of the overflow valve and the turbine pump in the working state, it is necessary to establish a matching test system of the overflow valve and the turbine pump.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defect of the prior art is overcome, and the ultra-high speed turbine pump and overflow valve matching test device is provided, so that the dynamic characteristic of the overflow valve and the matching coupling relation between the dynamic characteristic of the overflow valve and the ultra-high speed turbine pump in a working state can be verified.
The technical solution of the invention is as follows:
a test device for matching of an ultra-high-speed turbine pump and an overflow valve comprises a turbine driving device, a hydraulic system, a computer acquisition and control system and a real-time spectrum analyzer;
the turbine driving device comprises: in the test process, the test device is used for driving the turbine pump to work;
a hydraulic system: providing an equivalent simulation load for the ultra-high speed turbine pump;
computer acquisition and control system: adjusting the flow of the equivalent analog load according to the performance requirement; acquiring the rotating speed, the rotor small shaft end vibration quantity and the opening pressure, the flow, the rated pressure, the closing pressure and the natural vibration frequency of an overflow valve in the working process of the ultra-high-speed turbine pump in real time, processing to obtain the dynamic characteristic of the overflow valve, and sending the acquired parameters to a real-time frequency spectrum analyzer;
a real-time spectrum analyzer: and (3) performing spectrum analysis on the natural vibration frequency of the overflow valve and the vibration quantity of the small shaft end of the super-high speed turbine pump rotor aiming at the unopened, opening and completely opened states of the underflow valve in different test environments to obtain the matching relation between the dynamic characteristic of the underflow valve in the self-excitation phenomenon and the vibration quantity of the small shaft end of the super-high speed turbine pump rotor.
The turbine driving device is driven by helium and comprises a helium bottle, an explosion-proof electromagnetic valve and an electromagnetic stop valve; the helium tank is connected with a gas inlet of the turbo pump sequentially through the explosion-proof electromagnetic valve and the electromagnetic stop valve, and a gas outlet of the turbo pump is directly emptied.
The hydraulic system comprises a self-pressurization oil tank and a servo valve; an oil inlet of the self-pressurization oil tank is connected with a liquid inlet of the turbine pump, a liquid outlet of the turbine pump is connected with an inlet of the servo valve, an outlet of the servo valve is connected with an oil return port of the self-pressurization oil tank, and the overflow valve to be tested is connected with the servo valve in parallel; the servo valve is used as an equivalent analog load, and the computer acquisition and control system controls the opening of the servo valve to realize the control of flow.
A heat exchanger is arranged between the outlet of the servo valve and the oil return port of the self-pressurization oil tank, and a safety valve is arranged between the liquid outlet of the turbo pump and the outlet of the servo valve.
The self-pressurization oil tank is a volume-adjustable oil tank and comprises an electric filling platform, an air source and an oil tank;
the air source is connected with an air cavity of the oil tank and provides pressurizing pressure for the oil tank; the electric filling platform is connected with an oil way on a piston rod in the oil tank and is used for filling oil into the oil tank; the oil tank bottom is provided with first temperature sensor, first stop valve and first pressure sensor, and first displacement sensor is connected with the piston rod in the oil tank for detect the oil level change of oil tank, electronic filling platform is transferred the assigned position through first stop valve and the cooperation of first displacement sensor with the oil tank liquid level.
The electric filling platform comprises a motor pump and a filling oil tank; the inlet of the motor pump is connected with the oil outlet of the filling oil tank, and the outlet of the motor pump is connected with an oil way on a piston rod in the oil tank; the oil inlet of oil tank passes through second stop valve, first check valve and is connected with the filling oil tank, realizes from the oil tank to the backward flow of filling the oil tank.
And an oil inlet of the oil tank is connected with the filling oil tank through a third stop valve and is used as a redundant backflow passage.
The self-pressurization oil tank also comprises a set of piston rod displacement measuring device, and the piston rod displacement measuring device realizes the movement of the piston rod in the volume adjusting process of the oil tank and the fixation of the piston rod after the piston rod reaches a designated position;
the piston rod displacement measuring device comprises a connecting piece, a pressing plate, a screw rod and a graduated scale; the top and the connecting piece one end of piston rod are connected in the oil tank, and during the other end of connecting piece inserted the clamp plate, the one end of screw rod was inserted in the clamp plate, and linked firmly with the connecting piece, and connecting piece, screw rod all with clamp plate threaded connection, the screw rod other end is connected with the screw rod seat, and the connecting piece is connected with reference scale one end, and the reference scale other end and scale contact, the scale is fixed on the test bench, realizes the displacement measurement to the connecting piece through the scale.
The piston rod displacement measuring device further comprises a second displacement sensor, and the second displacement sensor is connected with the connecting piece to achieve redundant measurement of the displacement of the connecting piece.
The computer acquisition and control system acquires the rotating speed of the ultra-high-speed turbine pump in the working process through a rotating speed sensor and acquires the vibration quantity of the small shaft end of the rotor through a vibration measuring sensor; the rotating speed sensor and the vibration measuring sensor are both eddy current sensors;
the installation mode of the rotating speed sensor and the ultra-high speed turbine pump is as follows:
a bearing sleeve with a key groove is arranged on the ultra-high speed turbine pump shaft, the rotating speed sensor is embedded on the inner shell of the turbine pump in a threaded connection mode, the distance between a probe of the rotating speed sensor and the key groove on the turbine pump shaft is 0.1-0.5mm, and pulse counting is carried out on square waves generated when eddy current of the rotating speed sensor meets a bulge, so that rotating speed measurement is realized;
the vibration measuring sensor and the ultra-high speed turbine pump are installed in the following mode:
the vibration measuring sensor is arranged on a turbine cover of the ultra-high speed turbine pump, the radial distance between a probe of the vibration measuring sensor and the small shaft end of a rotor of the turbine pump is 0.5-0.55mm, and a vibration value is calculated according to the pulse change of the eddy current of the vibration measuring sensor caused by the rotation of the rotor.
The test procedure was as follows:
(1) when the test is started, the test device is started, the turbine driving device drives the turbine pump to enable the turbine pump to work, and after the turbine pump reaches the rated rotating speed, the flow is indirectly adjusted through adjusting the equivalent simulation load through the computer acquisition and control system according to the requirements of the test working condition;
(2) under each state of equivalent simulation load, when the turbine pump reaches a rated working state, the opening pressure of the overflow valve is adjusted step by step, then the opening pressure, the rated flow, the rated pressure, the closing pressure and the natural vibration frequency of the overflow valve are collected through a computer collection and control system, test data are recorded, the dynamic characteristic of the overflow valve is obtained, and meanwhile, the vibration quantity of the small shaft end of the turbine rotor is collected through the computer collection and control system in real time;
(3) a real-time spectrum analyzer is used for obtaining a turbine pump rotor vibration spectrum and an overflow valve pressure oscillation spectrum, and the relation among a time domain, a frequency domain and a modulation domain is required to be analyzed in a time correlation view. And further obtaining the matching relation between the dynamic characteristic of the overflow valve and the vibration quantity of the small shaft end of the ultra-high speed turbine pump rotor.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention designs a matching test device for an ultra-high-speed turbine pump and an overflow valve, which can realize the test of the dynamic performance of the overflow valve under the condition of high temperature and high pressure and the measurement of the coupling relation between the dynamic characteristic of the overflow valve and the vibration quantity of the small shaft end of the turbine pump.
(2) The oil tank is a self-pressurization volume-adjustable oil tank, and the liquid level of the oil tank is adjusted to a specified position through the cooperation of the stop valve and the displacement sensor, so that the self-pressurization of the oil tank can be realized; through electronic notes platform, oil tank and air supply cooperation use, realize the pressure of oil tank and volumetric regulation before the experiment, greatly increased test device's flexibility.
(3) The invention designs the mounting structures of the rotating speed sensor and the vibration measuring sensor, thereby ensuring the mounting reliability of the rotating speed sensor and solving the problem that the mounting size of the rotating speed sensor is too small to process, and realizing the accurate measurement of the vibration quantity and the rotating speed of the small shaft end of the rotor in a narrow space.
Drawings
FIG. 1 is a schematic diagram of a hydraulic system of a super high speed turbine pump and overflow valve matching test device according to the present invention;
FIG. 2 is a schematic view of a self-pressurizing fuel tank of the present invention;
fig. 3 is a schematic view of installation of a turbine pump shafting vibration measurement sensor and a rotation speed sensor, wherein (a) is a specific installation form of the sensor, (b) is a schematic view of installation of the vibration measurement sensor, and (c) is a schematic view of installation of the rotation speed sensor.
Detailed Description
The invention provides a matching test device of an ultra-high-speed turbine pump and an overflow valve. The rotating speed of the ultra-high speed turbine pump is greater than the first-order critical rotating speed of the rotor.
The turbine driving device comprises: and in the test process, the device is used for driving the turbine pump to work.
A hydraulic system: and providing an equivalent simulation load for the ultra-high speed turbine pump.
Computer acquisition and control system: adjusting the flow of the equivalent analog load according to the performance requirement; the method comprises the steps of collecting and processing the rotating speed and the rotor small shaft end vibration quantity in the working process of the ultra-high-speed turbine pump, and the opening pressure, the flow, the rated pressure, the closing pressure and the natural vibration frequency of an overflow valve, obtaining the dynamic characteristic of the overflow valve after processing, and sending parameters after detection and analysis to a real-time spectrum analyzer.
A real-time spectrum analyzer: and acquiring signals of the conditions that the underflow valve is not opened, is opened and is completely opened in different test environments, and performing frequency spectrum analysis on the natural vibration frequency of the overflow valve and the vibration quantity of the small shaft end of the ultra-high speed turbine pump rotor in each condition to obtain the matching relation between the dynamic characteristic of the underflow valve in the self-excitation phenomenon and the vibration quantity of the small shaft end of the ultra-high speed turbine pump rotor.
As shown in fig. 1, the turbine drive is driven with helium. The turbine drive includes a helium tank, an explosion-proof solenoid valve 181 and an electromagnetic shutoff valve 182. The helium tank is connected with the gas inlet of the turbo pump 19 through an explosion-proof electromagnetic valve 181 and an electromagnetic stop valve 182 in sequence. The gas outlet of the turbo pump 19 is directly evacuated.
As shown in fig. 1, the hydraulic system includes a self-pressurizing oil tank and a servo valve 24; an oil inlet of the self-pressurization oil tank is connected with a liquid inlet of the turbine pump 19, a liquid outlet of the turbine pump 19 is connected with an inlet of the servo valve 24, an outlet of the servo valve 24 is connected with an oil return port of the self-pressurization oil tank, and the detected overflow valve is connected with the servo valve 24 in parallel.
The servo valve 24 is used as an equivalent analog load, and the computer acquisition and control system controls the opening of the servo valve 24 to realize the control of the flow.
In order to monitor the flow rate, pressure and temperature, a third temperature sensor 23, a third pressure sensor 43, a second pressure gauge 172 (redundant with the third pressure sensor 43), a third check valve 153, the high-pressure oil filter 12, a first flow meter 221 and a fourth shut-off valve 39 are provided between the liquid outlet of the turbo pump 19 and the inlet of the servo valve 24. The third check valve 153 functions to ensure that oil flows along the turbo pump outlet to the servo valve 24.
A heat exchanger 25 is provided between the outlet of the servo valve 24 and the return of the self-pressurizing tank. A relief valve 20 is provided between the turbo pump fluid outlet and the servo valve 24 outlet.
A fourth pressure sensor 44 and a third pressure gauge 173 are provided at the inlet of the measured relief valve in a branch of the measured relief valve in parallel with the servo valve 24. And a second flow meter 222 is arranged at the outlet of the measured overflow valve.
As shown in figure 2, the self-pressurization oil tank is an oil tank with adjustable volume, and comprises an electric injection platform, an air source, an oil tank and the like, wherein the piston rod moves to realize the volume change of the oil tank from 1L to 10L, the air source realizes the pressurization of the oil tank, and the electric injection platform adjusts the liquid level of the oil tank to a specified position through the matching of a stop valve and a displacement sensor.
The air source is connected with the air cavity of the oil tank 1 to provide pressurizing pressure for the oil tank 1. The electric filling platform is connected with an oil way on a piston rod in the oil tank 1 and is used for filling oil into the oil tank 1.
In order to obtain parameters of displacement, pressure, etc., a first temperature sensor 21, a first shut-off valve 31 and a first pressure sensor 41 are provided at the bottom of the oil tank 1. The first displacement sensor 5 is used for connecting with the oil tank 1 piston rod and detecting the oil level change.
A pressure reducing valve 9, a filter 10, a fifth stop valve 33 and a two-position three-way electromagnetic directional valve 11 are arranged between an air source (a nitrogen cylinder 8 is selected in the invention) and an air cavity of an oil tank 1.
The electric filling platform comprises a motor pump 13 and a filling oil tank 14; the inlet of the motor pump 13 is connected with the oil outlet of the filling oil tank 14, and the outlet of the motor pump 13 is connected with the oil path on the piston rod in the oil tank 1. An oil inlet of the oil tank 1 is connected with the filling oil tank 14 through the second stop valve 37 and the first check valve 151, so that backflow from the oil tank 1 to the filling oil tank 14 is realized. In order to ensure reliability, a set of redundant return paths is designed, namely the oil inlet of the oil tank 1 is connected with the filling oil tank 14 through a third stop valve 36.
A connection path between an oil inlet of the oil tank 1 and a liquid inlet of the turbo pump 19 is provided with a fourth shutoff valve 38, a second check valve 152, the low-pressure oil filter 16, the second temperature sensor 22, the second pressure sensor 42, and a first pressure gauge 171 (redundant with the second pressure sensor 42). The second check valve 152 is used to enable a fluid passage from the oil inlet of the oil tank 1 to the fluid inlet of the turbo pump 19.
In order to accurately measure the displacement of the oil level in the oil tank 1, the invention designs a piston rod displacement measuring device, which realizes the displacement of the piston rod 111 and the fixation of the piston rod 111 after reaching a specified position in the volume adjusting process of the oil tank 1.
The piston rod displacement measuring device comprises a connecting member 118, a pressure plate 119, a screw 120, a second displacement sensor 116 and a scale 117. The top end of a piston rod 111 in the oil tank is connected with one end of a connecting piece 118, the other end of the connecting piece 118 is inserted into a pressing plate 119, one end of a screw rod 120 is inserted into the pressing plate 119 and is fixedly connected with the connecting piece 118, the connecting piece 118 and the screw rod 120 are both in threaded connection with the pressing plate 119, and the other end of the screw rod 120 is connected with a screw rod seat 121. The connecting piece 118 is connected with one end of the reference scale, the other end of the reference scale is connected with the graduated scale 117, the graduated scale 117 is fixed on the test bed, and the second displacement sensor 116 is connected with the connecting piece 118. The displacement measurement of the link 118 is achieved by means of a scale 117 and a second displacement sensor 116.
The invention uses the safety valve 20 and the tested overflow valve 23 to realize the overpressure protection function of the oil tank and the pipeline. In the device, a servo valve 24 is used as an equivalent analog load, the flow control is realized, a first flow meter 221 and a second flow meter 222 are used for detecting the detected overflow valve and the change of the flow of the whole system, the timely cooling of the whole system is realized through a heat exchanger 25, and an exhaust valve and an exhaust port are arranged in a fuel tank 1 for exhausting the whole device and the fuel tank. The use of low-pressure oil filter 16 and high-pressure oil filter 21 ensures that the entire system is clean and free of oil.
According to the invention, the pressure sensors and the pressure gauges are arranged at multiple points in the oil circuit, and the pressure pulsation frequency can be accurately measured through multi-point acquisition. Flow meters 221 and 222 are arranged at the outlet of the tested overflow valve and in the oil inlet main oil way and used for monitoring different flows when the opening and closing characteristics of the tested overflow valve are tested.
According to the invention, a self-pressurization volume-adjustable oil tank is adopted, the volume change of 1-10L of the oil tank is realized through the movement of a piston rod, the pressurization of the oil tank is realized through an air source, and the liquid level of the oil tank is adjusted to a specified position through the cooperation of a stop valve and a displacement sensor by an electric filling platform.
The electric filling platform, the oil tank and the air source are matched for use, and the pressure and the volume of the oil tank are adjusted before the test is started.
The regulation process for increasing the volume of the oil tank is as follows:
firstly, the screw rod 120 is adjusted to drive the piston rod 111 to move to the right to a designated position, the second stop valve 37 is opened, the electric filling platform fills oil into the oil tank 1, and whether the oil reaches the designated oil level position is observed through the liquid level meter;
when the oil level reaches the designated position, the second stop valve 37 is closed, the two-position two-way electromagnetic directional valve 11 is powered off, and nitrogen enters the oil tank through the pressure reducing valve 9, the filter 10 and the two-position three-way electromagnetic directional valve 11, so that the pressurization effect is realized.
The regulation process for reducing the volume of the oil tank is as follows:
firstly, the screw rod 120 is adjusted to drive the piston rod 111 to move left, meanwhile, oil is injected into the filling oil tank 14 through the second stop valve 37 and the first check valve 151, and whether the oil reaches the specified oil level position is observed through the liquid level meter;
when the oil level reaches the designated position, the two-position three-way electromagnetic directional valve 11 is powered off, and nitrogen enters the oil tank through the pressure reducing valve 9, the filter 10 and the two-position three-way electromagnetic directional valve 11, so that the pressurization effect is realized.
The piston rod displacement measuring device realizes fixation after the piston rod 111 reaches a designated position and movement in the volume adjusting process; the displacement sensor 116 and the graduated scale 117 can accurately display the change of the displacement corresponding to the volume, so that accurate positioning is realized; the liquid level meter can display the height of the oil level of the oil tank.
The computer acquisition and control system acquires the rotating speed of the ultra-high speed turbine pump in the working process through the rotating speed sensor 194 and acquires the vibration quantity of the small shaft end of the rotor through the vibration measuring sensor 192.
The rotating speed sensor and the vibration measuring sensor are both eddy current sensors;
the installation mode of the rotating speed sensor and the ultra-high speed turbine pump is as follows:
a bearing sleeve with a key groove is arranged on the shaft of the ultra-high-speed turbine pump, the rotating speed sensor is embedded on the inner shell of the turbine pump in a threaded connection mode, the probe of the rotating speed sensor is 0.1-0.5mm away from the key groove on the turbine pump, and pulse counting is carried out on square waves generated when eddy current of the rotating speed sensor meets a bulge, so that rotating speed measurement is realized;
the vibration measuring sensor and the ultra-high speed turbine pump are installed in the following mode:
the vibration measuring sensor is arranged on a turbine cover of the ultra-high speed turbine pump, the radial distance between a probe of the vibration measuring sensor and the small shaft end of a rotor of the turbine pump is 0.5-0.55mm, and a vibration value is calculated according to the pulse change of the eddy current of the vibration measuring sensor caused by the rotation of the rotor.
The ultrahigh-speed turbine pump and overflow valve matching test device provided by the invention is mainly used for measuring the vibration quantity of the small shaft end of the turbine rotor in real time in the test process, and researching the internal corresponding relation between the rated flow and pressure of the ultrahigh-speed turbine pump and the dynamic characteristics of the overflow valve aiming at different dynamic characteristics of the overflow valve. For testing and analyzing the dynamic performance matching of the ultra-high-speed turbine pump and the overflow valve, real-time spectrum analysis is needed, the vibration spectrum of the rotor of the turbine pump and the pressure oscillation spectrum of the overflow valve are tested, and the relation among a time domain, a frequency domain and a modulation domain is required to be analyzed in a time correlation view. The acquisition can be triggered when the signal changes, the signal can be captured seamlessly, and the influence of the change can be analyzed in all domains.
Specifically, in order to measure the rotational speed of the turbo pump and the vibration amount (radial measurement) of the small shaft end, the acquisition frequency of the sensor is 5000HZ, and the vibration displacement is 0-500um, so eddyNCDT-3010-U05 type eddy current vibration measurement sensor and eddyNCDT-turboSPEED-135 type eddy current rotational speed sensor manufactured by german mikey company are selected, and the specific installation form of the eddy current sensor is shown in fig. 3 (a).
The installation schematic diagram of the vibration measurement sensor for measuring the vibration of the small shaft end is shown in (b) in fig. 3, the diameter of the measured shaft end is 6-12 mm, the diameter of a probe of the vibration measurement sensor is 2mm, the requirement of measurement is met, the vibration measurement sensor is matched with a support hole in a turbine cover 193, the vibration measurement sensor is fixed by locking nuts at two ends, the radial distance between the probe and the small shaft end shaft is 0.5mm, and the measurement is realized by utilizing the pulse change of eddy current caused by the vibration during rotation. As shown in fig. 3 (c), a bearing sleeve having a key groove with a width of 1.2mm and a height of 1mm is mounted on the turbine pump shaft 191. The rotating speed sensor is embedded in the turbine pump in a threaded connection mode, is installed at a position 0.3mm away from an on-axis key groove, and is used for measuring square waves generated when the protrusions meet eddy currents.
The test process of the test device of the invention is as follows:
(1) during testing, the testing device is started, the high-pressure helium gas drives the turbine pump to enable the turbine to work, and after the turbine pump reaches the rated rotating speed, the opening degree of the equivalent simulation load is adjusted (states of full opening, half opening, full closing and the like are achieved) through the computer acquisition and control system according to the requirements of testing working conditions so as to achieve flow adjustment.
(2) And respectively testing the dynamic characteristics of the overflow valve, the vibration quantity of a turbine pump rotor and the like when the tested turbine pump reaches a rated working state under each opening degree. During testing, the opening and closing characteristics of the overflow valve are adjusted step by step according to a certain magnitude (such as the step by step adjustment of the opening pressure of 0.2MPa), then the opening pressure, the rated flow, the rated pressure, the closing pressure and the like of the overflow valve are collected, comparison testing is respectively carried out, test data are recorded, and the dynamic characteristics of the overflow valve are obtained. And measuring the vibration quantity of the small shaft end of the turbine rotor in real time.
(3) And obtaining dynamic characteristics of underflow valves with different opening degrees and vibration quantity of small shaft ends of the rotors of the turbine pump. Aiming at different dynamic characteristics of the overflow valve, the intrinsic corresponding relation between the rated flow and pressure of the turbopump and the dynamic characteristics of the overflow valve is researched. And performing spectrum analysis on the overflow valve self-vibration frequency and the vibration quantity of the small shaft end of the ultra-high speed turbine pump rotor by using a real-time spectrum analyzer to obtain a test turbine pump rotor vibration spectrum and an overflow valve pressure oscillation spectrum, and analyzing the relation among a time domain, a frequency domain and a modulation domain in a time correlation view to further obtain the matching relation between the dynamic characteristic of the underflow valve under the self-excitation phenomenon and the vibration quantity of the small shaft end of the ultra-high speed turbine pump rotor.
The invention can trigger acquisition when the signal changes, seamlessly capture the signal and analyze the influence of the change in all domains. The overflow valve self-excitation state and the self-excitation time of the overflow valve can be visually seen through time domain analysis by adopting a frequency spectrum analyzer, and the self-excitation frequency oscillation interval of the overflow valve and the oscillation frequency of the liquid body can be obtained through the frequency domain analysis, so that the analysis of the overflow valve self-excitation squeal phenomenon is realized.
Embodiments of the present invention are described in detail above with reference to the drawings, which are provided to provide a further understanding of the invention. It should be understood that the above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art without substantially departing from the present invention are also included in the scope of the present invention.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (9)
1. The utility model provides a test device is matchd with overflow valve to hypervelocity turbo pump which characterized in that: the system comprises a turbine driving device, a hydraulic system, a computer acquisition and control system and a real-time spectrum analyzer;
the turbine driving device comprises: in the test process, the test device is used for driving the turbine pump to work;
a hydraulic system: providing an equivalent simulation load for the ultra-high speed turbine pump;
computer acquisition and control system: adjusting the flow of the equivalent analog load according to the performance requirement; acquiring the rotating speed, the rotor small shaft end vibration quantity and the opening pressure, the flow, the rated pressure, the closing pressure and the natural vibration frequency of an overflow valve in the working process of the ultra-high-speed turbine pump in real time, processing to obtain the dynamic characteristic of the overflow valve, and sending the acquired parameters to a real-time frequency spectrum analyzer;
a real-time spectrum analyzer: performing spectrum analysis on the natural vibration frequency of the overflow valve and the vibration quantity of the small shaft end of the super-high speed turbine pump rotor aiming at the unopened, opening and completely opened states of the underflow valve in different test environments to obtain the matching relation between the dynamic characteristic of the underflow valve in the self-excitation phenomenon and the vibration quantity of the small shaft end of the super-high speed turbine pump rotor;
the turbine driving device is driven by helium and comprises a helium tank, an explosion-proof electromagnetic valve (181) and an electromagnetic stop valve (182); the helium bottle is connected with a gas inlet of the turbo pump (19) through an anti-explosion electromagnetic valve (181) and an electromagnetic stop valve (182) in sequence, and a gas outlet of the turbo pump (19) is directly evacuated;
the computer acquisition and control system acquires the rotating speed of the ultra-high-speed turbine pump in the working process through a rotating speed sensor and acquires the vibration quantity of the small shaft end of the rotor through a vibration measuring sensor; the rotating speed sensor and the vibration measuring sensor are both eddy current sensors;
the installation mode of the rotating speed sensor and the ultra-high speed turbine pump is as follows:
the method comprises the following steps that a bearing sleeve with a key groove is arranged on an ultra-high-speed turbine pump shaft, the width of the key groove is 1.2mm, the height of the key groove is 1mm, a rotating speed sensor is embedded in an inner shell of the turbine pump in a threaded connection mode, a probe of the rotating speed sensor is 0.1-0.5mm away from the key groove in the turbine pump shaft, pulse counting is carried out on square waves generated when eddy currents of the rotating speed sensor meet protrusions, and rotating speed measurement is achieved;
the vibration measuring sensor and the ultra-high speed turbine pump are installed in the following mode:
the vibration measurement sensor is arranged on a turbine cover of the ultra-high-speed turbine pump, the diameter of a measurement shaft end is 6-12 mm, the diameter of a probe of the vibration measurement sensor is 2mm, the radial distance between the probe of the vibration measurement sensor and the small shaft end of a turbine pump rotor is 0.5-0.55mm, and a vibration value is calculated according to the pulse change of the eddy current of the vibration measurement sensor caused by the rotation of the rotor.
2. The ultra-high speed turbine pump and overflow valve matching test device according to claim 1, characterized in that: the hydraulic system comprises a self-pressurization oil tank and a servo valve (24); an oil inlet of the self-pressurization oil tank is connected with a liquid inlet of a turbine pump (19), a liquid outlet of the turbine pump (19) is connected with an inlet of a servo valve (24), an outlet of the servo valve (24) is connected with an oil return port of the self-pressurization oil tank, and a detected overflow valve is connected with the servo valve (24) in parallel; the servo valve (24) is used as an equivalent analog load, and the computer acquisition and control system controls the opening of the servo valve (24) to realize the control of the flow.
3. The ultra-high speed turbine pump and overflow valve matching test device according to claim 2, characterized in that: a heat exchanger (25) is arranged between an outlet of the servo valve (24) and an oil return port of the self-pressurization oil tank, and a safety valve (20) is arranged between a liquid outlet of the turbo pump (19) and an outlet of the servo valve (24).
4. The ultra-high speed turbine pump and overflow valve matching test device according to claim 3, characterized in that: the self-pressurization oil tank is a volume-adjustable oil tank and comprises an electric filling platform, an air source and an oil tank (1);
the air source is connected with the air cavity of the oil tank (1) and provides pressurizing pressure for the oil tank (1); the electric filling platform is connected with an oil way on a piston rod in the oil tank (1) and is used for filling oil into the oil tank (1); the bottom of the oil tank (1) is provided with a first temperature sensor (21), a first stop valve (31) and a first pressure sensor (41), a first displacement sensor (5) is connected with a piston rod in the oil tank (1) and used for detecting the change of the oil level of the oil tank (1), and the electric filling platform is matched with the first displacement sensor (5) through the first stop valve (31) to set the liquid level of the oil tank (1) to a specified position.
5. The ultra-high speed turbine pump and overflow valve matching test device according to claim 4, characterized in that: the electric filling platform comprises a motor pump (13) and a filling oil tank (14); an inlet of the motor pump (13) is connected with an oil outlet of the filling oil tank (14), and an outlet of the motor pump (13) is connected with an oil way on a piston rod in the oil tank (1); an oil inlet of the oil tank (1) is connected with the filling oil tank (14) through a second stop valve (37) and a first one-way valve (151), so that backflow from the oil tank (1) to the filling oil tank (14) is realized.
6. The ultra-high speed turbine pump and overflow valve matching test device according to claim 5, is characterized in that: an oil inlet of the oil tank (1) is connected with the filling oil tank (14) through a third stop valve (36) to be used as a redundant backflow passage.
7. The ultra-high speed turbine pump and overflow valve matching test device according to claim 5, is characterized in that: the self-pressurization oil tank also comprises a set of piston rod displacement measuring device, and the piston rod displacement measuring device realizes the movement of the piston rod (111) and the fixation of the piston rod (111) after reaching a designated position in the volume adjusting process of the oil tank (1);
the piston rod displacement measuring device comprises a connecting piece (118), a pressing plate (119), a screw rod (120) and a graduated scale (117); the top and the connecting piece (118) one end of piston rod (111) are connected in oil tank (1), the other end of connecting piece (118) inserts in clamp plate (119), the one end of screw rod (120) inserts in clamp plate (119), and link firmly with connecting piece (118), screw rod (120) all with clamp plate (119) threaded connection, the screw rod (120) other end is connected with screw rod seat (121), connecting piece (118) are connected with reference scale one end, the reference scale other end and scale (117) contact, scale (117) are fixed on the test bench, realize the displacement measurement to connecting piece (118) through scale (117).
8. The ultra-high speed turbine pump and overflow valve matching test device according to claim 7, characterized in that: the piston rod displacement measuring device further comprises a second displacement sensor (116), and the second displacement sensor (116) is connected with the connecting piece (118) to achieve redundant measurement of the displacement of the connecting piece (118).
9. The ultra-high speed turbine pump and overflow valve matching test device according to claim 1, characterized in that:
the test procedure was as follows:
(1) when the test is started, the test device is started, the turbine driving device drives the turbine pump to enable the turbine pump to work, and after the turbine pump reaches the rated rotating speed, the flow is indirectly adjusted through adjusting the equivalent simulation load through the computer acquisition and control system according to the requirements of the test working condition;
(2) under each state of equivalent simulation load, when the turbine pump reaches a rated working state, the opening pressure of the overflow valve is adjusted step by step, then the opening pressure, the rated flow, the rated pressure, the closing pressure and the natural vibration frequency of the overflow valve are collected through a computer collection and control system, test data are recorded, the dynamic characteristic of the overflow valve is obtained, and meanwhile, the vibration quantity of the small shaft end of the turbine rotor is collected through the computer collection and control system in real time;
(3) a real-time spectrum analyzer is used for obtaining a turbine pump rotor vibration spectrum and an overflow valve pressure oscillation spectrum, and the relation among a time domain, a frequency domain and a modulation domain is required to be analyzed in a time correlation view, so that the matching relation between the dynamic characteristic of the overflow valve and the vibration quantity of the small shaft end of the ultra-high speed turbine pump rotor is obtained.
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| CN111999219B (en) * | 2020-07-13 | 2021-09-14 | 山东大学 | Smoke intensity detection method and system for engineering machinery |
| CN112682238B (en) * | 2020-12-18 | 2021-11-12 | 西安精密机械研究所 | Full time domain spectrum analysis test device and method for adjusting fuel pump |
| CN113638891B (en) * | 2021-04-29 | 2024-03-15 | 北京精密机电控制设备研究所 | Turbine pump test system |
| CN113389764B (en) * | 2021-06-30 | 2022-11-15 | 四川航天烽火伺服控制技术有限公司 | Hydraulic equipment and turbo pump outlet pressure control system thereof |
| CN114753891B (en) * | 2022-03-25 | 2024-02-09 | 北京精密机电控制设备研究所 | Self-adaptive speed stabilizing control system and method for load of ultra-high speed turbine |
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