CN118188527A - High-pressure immersed pump performance test system suitable for low-temperature liquid - Google Patents
High-pressure immersed pump performance test system suitable for low-temperature liquid Download PDFInfo
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- CN118188527A CN118188527A CN202410456139.0A CN202410456139A CN118188527A CN 118188527 A CN118188527 A CN 118188527A CN 202410456139 A CN202410456139 A CN 202410456139A CN 118188527 A CN118188527 A CN 118188527A
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- 239000007788 liquid Substances 0.000 title claims abstract description 45
- 238000011056 performance test Methods 0.000 title claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 34
- 238000005259 measurement Methods 0.000 claims abstract description 15
- 238000013461 design Methods 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 4
- 239000011229 interlayer Substances 0.000 claims description 4
- 239000010410 layer Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 abstract description 12
- 230000020169 heat generation Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000036760 body temperature Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The invention discloses a high-pressure immersed pump performance test system suitable for low-temperature liquid, which comprises: a low temperature tank, a pressure sensor, a shut-off valve, a mass flow meter, and a control and measurement subsystem. The test system of the patent considers the pre-cooling problem of the high-pressure immersed pump to be tested, gives out a detection standard for judging whether the pre-cooling is finished or not, and avoids the failure of the high-pressure immersed pump to be tested due to insufficient forced test of the pre-cooling; the pre-cooling problem of the test system is considered, and a detection standard for judging whether pre-cooling is finished is provided, so that inaccurate measurement caused by gas-liquid two phases in an outlet pipeline is avoided; the heat generation amount can be reversely deduced by measuring the mechanical efficiency under each working condition, so that a data basis is provided for the design of the liquid storage container.
Description
Technical Field
The invention belongs to the field of detection, and particularly relates to a high-pressure immersed pump performance test system suitable for low-temperature liquid.
Background
The high-pressure immersed pump can be used as a fuel high-pressure pumping device of an engine for a vehicle, a marine engine and an aeroengine. The rated rotation speed is 3000r/min, the rated output pressure is 30MPa, the rated liquid supply amount is 2.5L/min, and the medium temperature can reach minus 253 ℃ at the lowest.
There is no test system and no test method for such high pressure immersed pumps. Chinese patent CN 2022228378001 discloses a main component of a liquid nitrogen test system for a low-temperature immersed pump, and does not disclose technical indexes and specific test methods which can be achieved by the test system. Chinese patent CN 2022228948378 discloses a test platform for LNG low-temperature immersed pump, the maximum liquid outlet pressure and maximum liquid outlet flow rate which can be measured by the test platform are 6.3MPa and 800L/min, and no specific immersed pump performance test method is disclosed.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides a high-pressure immersed pump performance test system suitable for low-temperature liquid.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a high pressure immersed pump performance test system suitable for cryogenic liquids, comprising: a low temperature tank, a pressure sensor, a shut-off valve, a mass flow meter, and a control and measurement subsystem;
The low-temperature box is used for fixedly placing a high-pressure immersed pump to be tested, the high-pressure immersed pump to be tested is arranged at the bottom of the low-temperature box, an outlet of the high-pressure immersed pump to the outlet of the low-temperature box is connected with a pressure sensor, a stop valve and a mass flowmeter in sequence, and then the high-pressure immersed pump to be tested is connected with a liquid return port of the low-temperature box through a vacuum pipe;
the pressure sensor and the mass flowmeter are respectively used for detecting the outlet pressure and the outlet flow of the high-pressure submersible pump;
the stop valve is used for controlling the pressure of the outlet of the high-pressure immersed pump to be tested;
The control and measurement subsystem is used for setting the test working condition of the high-pressure immersed pump to be tested, measuring the liquid supply amount and mechanical efficiency performance parameters of the high-pressure immersed pump after the working condition is stable, and evaluating whether the high-pressure immersed pump to be tested reaches the design index after all the working conditions are tested.
Further, the box body of the low-temperature box is a double-layer box body, is formed by welding stainless steel plates with the thickness of 3mm, and is vacuumized in an interlayer; the top of the low-temperature box is provided with a fixed box cover and a movable box cover, and the fixed box cover is provided with a liquid supplementing valve, a liquid level meter and an exhaust valve.
Further, the pressure sensor and the mass flowmeter are arranged in the valve box, the box body of the valve box is a double-layer box body, and is formed by welding stainless steel plates with the thickness of 3mm, and the interlayer is vacuumized.
Further, the control and measurement subsystem comprises an upper computer, a mixed signal collector, a motor driver and a direct current power supply; the upper computer is used for setting the test working condition of the high-pressure immersed pump to be tested and detecting and evaluating the performance of the high-pressure immersed pump;
the mixed signal collector is used for collecting the running state and performance parameters of the high-pressure submersible pump in real time;
The motor driver is used for controlling the rotating speed of the high-pressure immersed pump;
The direct current power supply is used for supplying power to the motor driver.
Further, the upper computer detects and evaluates the performance of the high-pressure immersed pump by adopting the following steps:
(1) Detecting that the high-pressure immersed pump to be tested finishes precooling;
(2) Detecting the flow rate of the high-pressure submersible pump to be tested, the temperature of the pump body and the temperature of the motor shell to be stable, and indicating that the test system finishes precooling;
(3) Regulating the rotating speed of the measured high-Pressure immersed pump to a rotating speed set value of a working condition to be measured, slowly closing a stop valve after the rotating speed is stable to enable the outlet Pressure of the measured high-Pressure immersed pump to reach a corresponding set value, recording a power value Powerin of a direct-current power supply, a Pressure value Pressure of a Pressure sensor and a flow value Q of a mass flowmeter after the Pressure is stable, and calculating mechanical efficiency according to a formula 1;
(4) After the measurement of the current working condition is completed, the stop valve is fully opened, and then the rotating speed and the pressure of the next working condition are sequentially set, and the cycle is performed until all working conditions are tested;
(5) And calculating the heating value under each working condition according to the mechanical efficiency measured by each working condition, and evaluating whether the performance of the working condition meets the design index through the outlet flow and the mechanical efficiency.
Further, liquid nitrogen is used as a test medium in the detection process.
Further, the high-pressure immersed pump in the step (1) completes precooling, and judgment is carried out by measuring whether the phase resistance of the motor is reduced to a stable value.
Further, a first temperature sensor is arranged on a pump body of the high-pressure immersed pump to be tested, and a second temperature sensor is arranged on a motor shell.
Further, the mixed signal collector collects output signals of the first temperature sensor, the second temperature sensor, the liquid level meter, the pressure sensor and the mass flowmeter and current rotating speed signals output by the motor driver.
Further, the first temperature sensor and the second temperature sensor are fixed on a high-pressure immersed pump to be tested by adopting stainless steel belts, and cables of the high-pressure immersed pump and the two sensors are led out of the low-temperature box through a flange vacuum connector.
The test system of this patent has three main advantages: firstly, the pre-cooling problem of the high-pressure immersed pump to be tested is considered, and a detection standard for judging whether the pre-cooling is finished is provided, so that the failure of the high-pressure immersed pump to be tested caused by insufficient forced pre-cooling test is avoided; secondly, the precooling problem of the test system is considered, and a detection standard for judging whether precooling is finished is provided, so that inaccurate measurement caused by gas-liquid two phases in an outlet pipeline is avoided; thirdly, through measuring the mechanical efficiency under each operating mode, can reverse the heat generation capacity so as to provide data basis for the design of stock solution container.
Drawings
FIG. 1 is a schematic diagram of an embodiment high pressure immersed pump performance testing system.
FIG. 2 is a piping connection diagram of a performance test system for a high pressure immersed pump according to an embodiment.
FIG. 3 is an external view of the embodiment cryostat and valve housing.
FIG. 4 is a schematic diagram of an embodiment control and measurement subsystem configuration.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It is noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of the present application and in the foregoing figures, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.
The high-pressure immersed pump is a four-plunger reciprocating pump, is directly driven by a non-inductive permanent magnet synchronous motor, and can be used as a fuel high-pressure pumping device of an engine for a vehicle, a marine engine and an aeroengine. The rated rotation speed is 3000r/min, the rated output pressure is 30MPa, the rated liquid supply amount is 2.5L/min, and the medium temperature can reach minus 253 ℃ at the lowest. Liquid nitrogen is used as a test medium when measuring the performance of the high-pressure submersible pump.
As shown in the drawing, a high-pressure immersed pump 2 is fixedly arranged at the bottom of a low-temperature box 1, and an outlet of the high-pressure immersed pump 2 is connected to an outlet of the low-temperature box through a high-pressure steel pipe 3 and then connected to an inlet of a valve box 5 through a vacuum high-pressure pipe 4. The cable of the high-pressure immersed pump 2 is connected to a motor driver 12 through a flange vacuum joint 10, and the motor driver 12 adjusts the rotation speed of the high-pressure immersed pump 2.
As shown in the drawing, a pump body of the high-pressure immersed pump 2 is provided with a PT100 temperature sensor 2-1, and a motor housing of the high-pressure immersed pump 2 is provided with the PT100 temperature sensor 2-2. The two temperature sensors are fixed by stainless steel ties, and the cables of the two temperature sensors are led out through the flange vacuum connector 10.
As shown in the drawing, the low-temperature box 1 adopts a stainless steel plate welding mode with the thickness of 3mm, and the hollow area is vacuumized to ensure good heat insulation and preservation effects. As shown in the drawing, a liquid supplementing valve 9, a liquid level meter 8 (output signal is 4-20 mA) and an exhaust valve 7 are arranged on a fixed box cover of the low-temperature box 1, and a normally open vent is arranged. As shown in the drawing, after the high-pressure immersed pump 2 and the high-pressure steel pipe 3 to be tested are installed, the movable box cover of the low-temperature box 1 is covered to reduce the vaporization loss of liquid nitrogen in the test process as much as possible.
As shown in the attached drawing, the pressure sensor 5-1 is arranged in the valve box 5, the measuring range is 0-60 MPa, and the output signal is 4-20 mA. One end of the pressure sensor 5-1 is connected with the outlet of the high-pressure immersed pump 2, and the other end is connected with the inlet of the stop valve 5-2. The outlet of the stop valve 5-2 is connected with the inlet of the Coriolis mass flowmeter 5-3, the measuring range is 0-300 kg/h, and the output signal is 4-20 mA. The outlet of the coriolis mass flowmeter 5-3 is connected to the liquid return port of the cryogenic tank 1 through a vacuum tube 6. As shown in the drawings, a coriolis mass flowmeter 5-3 is installed in the valve housing 5. As shown in the figure, after the pressure sensor 5-1, the stop valve 5-2 and the coriolis mass flowmeter 5-3 are installed, the movable case cover of the valve case 5 is covered to reduce vaporization loss of liquid nitrogen during the test as much as possible. The cables of the pressure sensor 5-1 and the coriolis mass flowmeter 5-3 lead out of the opening of the movable cover of the valve housing 5.
As shown in the drawing, the control and measurement subsystem is composed of a host computer 14, a mixed signal collector 11 (model NI cDAQ 9185), a motor driver 12, and a dc power supply 13 (model ITECH IT 6512A). The measurement and control software runs on the upper computer 14, controls the analog voltage output card NI 9263 of the mixed signal collector 11 to output 0-10V signals to the motor driver 12, and correspondingly adjusts the rotating speed of the high-pressure immersed pump 2 to 0-5000 r/min. The motor driver 12 converts the actual rotation speed signal into a frequency signal and connects the frequency signal to the digital signal card NI 9401 of the mixed signal collector 11. The motor drive 12 is powered by a dc power supply 13, rated at 24V, maximum current 60A, which can measure the power output. The output signals of the liquid level meter 8, the pressure sensor 5-1 and the coriolis mass flowmeter 5-3 are connected to a current signal acquisition card NI 9203 of the mixed signal acquisition device 11. PT100 temperature sensors 2-1 and 2-2 are connected to thermal resistance acquisition card NI 9217 of mixed signal acquisition 11.
The performance test method for the high-pressure immersed pump based on the performance test system for the high-pressure immersed pump comprises the following steps:
The first step: precooling of the measured high-pressure immersed pump. When the measured high pressure immersed pump 2 is installed into the low temperature tank 1 from a normal temperature state, if insufficient cooling is caused, internal moving parts are blocked due to uneven deformation, and thus failure is caused. The method comprises the steps of judging whether pre-cooling is finished by utilizing the resistivity change of a motor stator winding, firstly adopting a six-bit half-digital multimeter to measure the value of the motor phase resistance (for example, 0.3 omega) at normal temperature, continuously measuring whether the motor phase resistance is reduced to a stable value (for example, 0.1 omega) after the measured high-voltage immersed pump 2 is installed, and if so, indicating that pre-cooling is finished.
And a second step of: pre-cooling of the test system. When the detected high-pressure immersed pump 2 is precooled, the stop valve 5-2 is fully opened, and the rotating speed of the high-pressure immersed pump 2 is regulated to 1200r/min. At this time, since the temperature of the valve housing 5 is relatively high, the flow value, which may be a gas-liquid two-phase flow, passing through the coriolis mass flowmeter 5-3 is unstable, and the temperatures of the pump body temperature (2-1) and the motor housing temperature (2-2) are increased. When the value of the flowmeter, the temperature of the pump body and the temperature of the motor casing are stable, the test system precooling is finished, and the continuous operation of the measured high-pressure immersed pump 2 is still kept.
And a third step of: and (5) measuring the variable working condition. And (3) regulating the rotating speed of the measured high-Pressure immersed pump 2 to a set value, slowly closing the stop valve 5-2 after the rotating speed is stable to enable the outlet Pressure of the measured high-Pressure immersed pump 2 to reach the set value, recording the Power value Power in of the direct-current Power supply 13, the Pressure value Pressure of the Pressure sensor 5-1 and the flow value Q of the Coriolis mass flowmeter 5-3 after the Pressure is stable, and calculating the mechanical efficiency according to a formula 1. After the measurement of the current working condition is completed, the stop valve 5-2 is fully opened, and then the rotating speed and the pressure of the next working condition are sequentially set, and the cycle is performed until all the working conditions are tested. According to the mechanical efficiency measured under each working condition, the heating value under the working condition can be calculated, and whether the performance of the working condition meets the design index is evaluated through the liquid supply amount and the mechanical efficiency.
It will be appreciated that the invention has been described by way of example only and that modifications may be made while remaining within the scope and spirit of the invention. The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention without requiring creative effort by one of ordinary skill in the art. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by a person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. A high pressure immersed pump performance test system suitable for cryogenic liquids, comprising: a low temperature tank, a pressure sensor, a shut-off valve, a mass flow meter, and a control and measurement subsystem;
The low-temperature box is used for fixedly placing a high-pressure immersed pump to be tested, the high-pressure immersed pump to be tested is arranged at the bottom of the low-temperature box, an outlet of the high-pressure immersed pump to the outlet of the low-temperature box is connected with a pressure sensor, a stop valve and a mass flowmeter in sequence, and then the high-pressure immersed pump to be tested is connected with a liquid return port of the low-temperature box through a vacuum pipe;
the pressure sensor and the mass flowmeter are respectively used for detecting the outlet pressure and the outlet flow of the high-pressure submersible pump;
the stop valve is used for controlling the pressure of the outlet of the high-pressure immersed pump to be tested;
The control and measurement subsystem is used for setting the test working condition of the high-pressure immersed pump to be tested, measuring the liquid supply amount and mechanical efficiency performance parameters of the high-pressure immersed pump after the working condition is stable, and evaluating whether the high-pressure immersed pump to be tested reaches the design index after all the working conditions are tested.
2. The high pressure immersed pump performance testing system suitable for cryogenic liquids according to claim 1, wherein: the box body of the low-temperature box is a double-layer box body, is formed by welding stainless steel plates with the thickness of 3mm, and is vacuumized in an interlayer; the top of the low-temperature box is provided with a fixed box cover and a movable box cover, and the fixed box cover is provided with a liquid supplementing valve, a liquid level meter and an exhaust valve.
3. The high pressure immersed pump performance testing system suitable for cryogenic liquids according to claim 1, wherein: the pressure sensor and the mass flowmeter are arranged in the valve box, the box body of the valve box is a double-layer box body, a stainless steel plate with the thickness of 3mm is welded, and the interlayer is vacuumized.
4. The high pressure immersed pump performance testing system suitable for cryogenic liquids according to claim 1, wherein: the control and measurement subsystem comprises an upper computer, a mixed signal collector, a motor driver and a direct current power supply;
The upper computer is used for setting the test working condition of the high-pressure immersed pump to be tested and detecting and evaluating the performance of the high-pressure immersed pump;
the mixed signal collector is used for collecting the running state and performance parameters of the high-pressure submersible pump in real time;
The motor driver is used for controlling the rotating speed of the high-pressure immersed pump;
The direct current power supply is used for supplying power to the motor driver.
5. The high pressure immersed pump performance testing system applicable to cryogenic liquids according to claim 4, wherein: the upper computer detects and evaluates the performance of the high-pressure immersed pump by adopting the following steps:
(1) Detecting that the high-pressure immersed pump to be tested finishes precooling;
(2) Detecting the flow rate of the high-pressure submersible pump to be tested, the temperature of the pump body and the temperature of the motor shell to be stable, and indicating that the test system finishes precooling;
(3) Regulating the rotating speed of the measured high-Pressure immersed pump to a rotating speed set value of a working condition to be measured, slowly closing a stop valve after the rotating speed is stable to enable the outlet Pressure of the measured high-Pressure immersed pump to reach a corresponding set value, recording a power value Powerin of a direct-current power supply, a Pressure value Pressure of a Pressure sensor and a flow value Q of a mass flowmeter after the Pressure is stable, and calculating mechanical efficiency according to a formula 1;
(4) After the measurement of the current working condition is completed, the stop valve is fully opened, and then the rotating speed and the pressure of the next working condition are sequentially set, and the cycle is performed until all working conditions are tested;
(5) And calculating the heating value under each working condition according to the mechanical efficiency measured by each working condition, and evaluating whether the performance of the working condition meets the design index through the outlet flow and the mechanical efficiency.
6. The high pressure immersed pump performance testing system applicable to cryogenic liquids according to claim 5, wherein: the detection process adopts liquid nitrogen as a test medium.
7. The high pressure immersed pump performance testing system applicable to cryogenic liquids according to claim 5, wherein: and (3) the high-pressure immersed pump in the step (1) completes precooling, and judgment is carried out by measuring whether the phase resistance of the motor is reduced to a stable value.
8. The high pressure immersed pump performance testing system applicable to cryogenic liquids according to claim 4, wherein: the pump body of the high-pressure immersed pump to be tested is provided with a first temperature sensor, and the motor shell is provided with a second temperature sensor.
9. The high pressure immersed pump performance testing system applicable to cryogenic liquids according to claim 8, wherein: the mixed signal collector collects output signals of the first temperature sensor, the second temperature sensor, the liquid level meter, the pressure sensor and the mass flowmeter and current rotating speed signals output by the motor driver.
10. The high pressure immersed pump performance testing system applicable to cryogenic liquids according to claim 8, wherein: the first temperature sensor and the second temperature sensor are fixed on a high-pressure immersed pump to be tested by adopting stainless steel belts, and cables of the high-pressure immersed pump and the two sensors are led out of the low-temperature box through a flange vacuum connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410456139.0A CN118188527A (en) | 2024-04-16 | 2024-04-16 | High-pressure immersed pump performance test system suitable for low-temperature liquid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410456139.0A CN118188527A (en) | 2024-04-16 | 2024-04-16 | High-pressure immersed pump performance test system suitable for low-temperature liquid |
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| Publication Number | Publication Date |
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| CN118188527A true CN118188527A (en) | 2024-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202410456139.0A Pending CN118188527A (en) | 2024-04-16 | 2024-04-16 | High-pressure immersed pump performance test system suitable for low-temperature liquid |
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| Country | Link |
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| CN (1) | CN118188527A (en) |
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- 2024-04-16 CN CN202410456139.0A patent/CN118188527A/en active Pending
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