CN114235380B - Low-pressure high-flow overflow valve test system and test method thereof - Google Patents
Low-pressure high-flow overflow valve test system and test method thereof Download PDFInfo
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- CN114235380B CN114235380B CN202111440059.9A CN202111440059A CN114235380B CN 114235380 B CN114235380 B CN 114235380B CN 202111440059 A CN202111440059 A CN 202111440059A CN 114235380 B CN114235380 B CN 114235380B
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- 238000005086 pumping Methods 0.000 claims abstract description 13
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- 239000003921 oil Substances 0.000 description 67
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a test system and a test method of a low-pressure high-flow overflow valve, wherein the test system comprises a circulating loop and a signal acquisition control module, wherein the circulating loop is connected with the low-pressure high-flow overflow valve and comprises a main-path oil pumping unit, a test unit, an oil return unit and a temperature control module which are sequentially connected, a transient response module is arranged in parallel with the test unit, the transient response module comprises a lifting valve, and a control end of the lifting valve is connected with a bypass oil pumping unit through an electromagnetic reversing valve. The test method comprises a pressure regulating range test, a pressure stability test, an internal leakage test, a pressure loss test, a steady-state pressure-flow characteristic test, a transient response test and a pressure regulating-moment regulating test of the low-pressure high-flow overflow valve. The invention realizes the optimization of the structure and the method, has stable and reliable operation, can be used for factory tests and model tests, and can ensure the accuracy and the no error of the performance test of the low-pressure high-flow overflow valve product.
Description
Technical Field
The invention relates to the technical field of overflow valve test systems, in particular to a low-pressure high-flow overflow valve test system and a test method thereof.
Background
The overflow valve is used as a constant pressure valve and a safety valve in the hydraulic system to protect the hydraulic system, so that the performance of the overflow valve directly influences the working performance and the working reliability of the whole hydraulic system. The low-pressure high-flow overflow valve is mainly applied to a ship control hydraulic system, the pressure regulating range is 4Bar to 12Bar, the pressure range of the direct-acting overflow valve which is uniformly determined in the existing overflow valve standard JB/T10374-2013 is 0 to 25Bar, the pressure of the existing test bed is higher for the produced overflow valve, and the measurement is relatively inaccurate at low pressure. Therefore, in order to more accurately measure the performance of the low-pressure high-flow overflow valve, a hydraulic system with low pressure and high flow needs to be designed and built, and a factory test and a model test are carried out on the low-pressure high-flow overflow valve, so that the accurate and error-free performance test of the product is ensured.
Disclosure of Invention
Aiming at the defects in the background technology, the invention provides a low-pressure high-flow overflow valve test system and a test method thereof, which solve the technical problem that the existing test bed of the overflow valve cannot meet the test requirement of the low-pressure high-flow overflow valve.
The technical scheme of the invention is realized as follows: the utility model provides a low pressure large-traffic overflow valve test system, includes circulation loop and signal acquisition control module that links to each other with low pressure large-traffic overflow valve, circulation loop is including the main way pump oil unit, test unit, oil return unit, the control by temperature change module that connect gradually, test unit sets up low pressure large-traffic overflow valve, temperature sensor, be located the inlet pressure sensor and the outlet pressure sensor at low pressure large-traffic overflow valve front and back both ends, be provided with the drain valve between outlet pressure sensor and the oil return section, be provided with transient response module with test unit in parallel, transient response module includes the poppet valve, the control end of poppet valve is connected with bypass pump oil unit through the electromagnetic reversing valve, the front end of low pressure large-traffic overflow valve is parallelly connected with large-traffic passageway and small-traffic passageway, large-traffic passageway and small-traffic passageway all are provided with flowmeter and control on-off valve, signal acquisition control module includes data acquisition device, controlling means and industrial computer, data acquisition device links to each other with flowmeter, temperature sensor, inlet pressure sensor, outlet pressure sensor, controlling means links to each other with main way pump oil unit, the control module, bypass pump oil unit, electromagnetic reversing valve.
The main way oil pumping unit comprises a main way hydraulic pump driven by a main way variable frequency motor, an oil inlet way triple flow valve, a main way pressure gauge and a main way overflow valve are arranged in parallel with the main way hydraulic pump, the output end of the main way hydraulic pump is sequentially connected with a one-way valve and an oil inlet way filter for feeding back differential pressure, the oil inlet way filter and the main way pressure gauge are connected with a data acquisition device, and the main way overflow valve and the main way variable frequency motor are connected with a control device.
The bypass pump oil unit comprises a bypass hydraulic pump driven by a bypass variable frequency motor, an energy accumulator, a bypass filter for feeding back pressure difference and an electromagnetic directional valve are sequentially connected between the output end of the bypass hydraulic pump and the control end of the lifting valve, a bypass pressure gauge and a bypass overflow valve connected with an oil return path are arranged between the electromagnetic directional valve and the bypass filter, the bypass variable frequency motor and the bypass overflow valve are connected with a control device, and the bypass filter and the bypass pressure gauge are connected with a data acquisition device.
The oil return unit comprises an oil return filter for feeding back differential pressure, the oil return filter is connected with an oil return triple flow valve in parallel, and the oil return filter is connected with the data acquisition device.
The test method of the low-pressure high-flow overflow valve test system comprises the steps of testing the pressure regulating range and the pressure stability of the low-pressure high-flow overflow valve, testing the internal leakage quantity of the low-pressure high-flow overflow valve and testing the pressure loss of the low-pressure high-flow overflow valve:
When the low-pressure large-flow overflow valve is subjected to pressure regulation range and pressure stability test, a large-flow channel is opened, a small-flow pipeline is closed, the main-path overflow valve is regulated to be fully tight, the low-pressure large-flow overflow valve is regulated to be fully loose, the rotating speed of the main-path variable frequency motor is controlled through a control device, meanwhile, the flow of a test system is enabled to be a certain value in the range of 100-300L/min through monitoring of a flow meter on the large-flow channel, actual measurement values of flow, temperature and pressure fed back by the flow meter, the temperature sensor, the inlet pressure sensor or the outlet pressure sensor on the large-flow channel are acquired through a data acquisition device and are uploaded to an industrial personal computer, and a temperature curve, a flow curve and a pressure curve are generated in real time.
When the low-pressure large-flow overflow valve is subjected to internal leakage test, a small-flow pipeline is opened, a large-flow channel is closed, the main-path overflow valve is regulated to be fully tight, the inlet pressure of the low-pressure large-flow overflow valve is regulated to be a certain value within the range of 0.6-1.8MPa, the measured value of an inlet pressure sensor is displayed on an industrial personal computer through a data acquisition device, the rotating speed of a main-path variable frequency motor is controlled through a control device, meanwhile, the flow of a test system is enabled to be a certain value within the range of 100-300L/min through monitoring of a flowmeter on the small-flow channel, then the main-path overflow valve is regulated, the pressure of the system is reduced to be 50-80% of the upper regulation limit value of the low-pressure large-flow overflow valve, and the valve core of the low-pressure large-flow overflow valve is closed under the action of a regulating spring and back pressure of the low-pressure large-flow overflow valve, and flow data fed back by the flowmeter on the small-flow channel are acquired through a data acquisition device at the moment, so that the internal leakage of the low-pressure large-flow overflow valve is obtained.
And if the internal leakage of the low-pressure large-flow overflow valve exceeds the accuracy range which can be acquired by the flowmeter on the small-flow channel, opening the drain valve, performing an internal leakage test, and measuring the oil liquid amount discharged from the drain valve, namely the internal leakage of the low-pressure large-flow overflow valve.
When the low-pressure high-flow overflow valve is subjected to pressure loss test, a high-flow channel is opened, a low-flow channel is closed, the main way overflow valve is regulated to be fully tight, the low-pressure high-flow overflow valve is regulated to be fully loose, the rotating speed of the main way variable frequency motor is controlled by a control device, meanwhile, the flow of a test system is enabled to be a certain value within the range of 100-300L/min through monitoring of a flowmeter on the high-flow channel, actual measurement values fed back by an inlet pressure sensor and an outlet pressure sensor are collected through a data collecting device and are uploaded to an industrial personal computer, and the actual measurement of pressure is read and displayed on the industrial personal computer in real time to generate a pressure loss test curve in real time.
Further, the device also comprises a steady-state pressure-flow characteristic test of the low-pressure high-flow overflow valve, and during the test, a high-flow pipeline is opened, a low-flow pipeline is closed, the main-path overflow valve is regulated to be fully tight, the low-pressure high-flow overflow valve is regulated to be an upper regulation limit value, the rotating speed of the main-path variable frequency motor is controlled through the control device, meanwhile, the flow of a test system is enabled to be a certain value within the range of 100-300L/min through monitoring of the flowmeter on the high-flow channel, and the following test is carried out:
a) The main way overflow valve is regulated to gradually reduce the system pressure to the closing rate pressure of the low-pressure high-flow overflow valve, the high-flow pipeline is closed, the low-flow pipeline is opened at the same time, the actual measurement values of the flow and the pressure fed back by the flowmeter, the inlet pressure sensor or the outlet pressure sensor on the low-flow channel are collected through the data collecting device and uploaded to the industrial personal computer, and a pressure-flow characteristic curve is generated in real time;
if the internal leakage of the low-pressure large-flow overflow valve exceeds the accuracy range which can be acquired by the flowmeter on the small-flow channel, opening the drain valve to perform a steady-state pressure-flow characteristic test, measuring the oil liquid amount discharged from the drain valve, and drawing a steady-state pressure-flow characteristic curve by a dotting method;
b) And when the flow rate does not meet the flow rate of the test system, opening the large-flow channel, closing the small-flow channel, and recording a steady-state pressure-flow characteristic curve in real time through the industrial personal computer.
Further, the system also comprises a transient response test of the low-pressure high-flow overflow valve, wherein during the test, the main way overflow valve is adjusted to ensure that the pressure of the system is increased to 1-2 times of the rated pressure of the system, a high-flow channel is opened, and a low-flow channel is closed;
The low-pressure high-flow overflow valve is regulated to an upper limit value, and meanwhile, a frequency button on the industrial personal computer is regulated, and the rotating speed of the main variable frequency motor is regulated through the control device, so that the test flow of the system is a certain value within the range of 100-300L/min;
when the control device controls the electromagnetic directional valve to be electrified, the control end of the poppet valve is unloaded, the poppet valve is opened, a test system is unloaded, the inlet pressure of the low-pressure high-flow overflow valve cannot exceed the upper limit value of a pressure regulating range of 20%, then the control device controls the electromagnetic directional valve to be powered off and reset, the poppet valve is rapidly closed from an open state, the inlet of the low-pressure high-flow overflow valve generates a pressure step, the measured values of flow, temperature and pressure fed back by the flowmeter, the temperature sensor, the inlet pressure sensor and the outlet pressure sensor on a high-flow channel are collected through the data collecting device and are uploaded to the industrial personal computer, the change process of the inlet pressure of the low-pressure high-flow overflow valve is recorded, an inlet pressure response characteristic curve is generated, the measured values of response time, transient recovery time and pressure overshoot are recorded, whether the performance of the overflow valve is qualified or not is judged, and the industrial personal computer records the transient response test curve in real time and is used for analyzing test data.
Further, the system also comprises a pressure regulation and torque regulation test of the low-pressure large-flow overflow valve, when in test, a large-flow channel is opened, a small-flow channel is closed at the same time, the main-path overflow valve is regulated to enable the system pressure to rise to 1-1.5 times of the rated system pressure, the low-pressure large-flow overflow valve is regulated to be fully opened, a frequency button on an industrial personal computer is regulated at the same time, the rotating speed of the main-path variable frequency motor is regulated through a control device, the test flow of the system is enabled to be a certain value within a range of 100-300L/min, and an oil return triple flow valve is regulated at the same time, so that the outlet pressure of the low-pressure large-flow overflow valve is enabled to be a certain value within a range of 0.2-0.8 MPa;
the low-pressure high-flow overflow valve is regulated through a moment measuring instrument and a connecting tool, so that the inlet pressure of the low-pressure high-flow overflow valve is increased from the lower limit value to the upper limit value of a pressure regulating range, then is reduced from the upper limit value to the lower limit value, at least one pressure value is selected in the pressure regulating range, the inlet pressure, the outlet pressure and the flow under each selected pressure value are measured through an inlet pressure sensor, a flow sensor and an outlet pressure sensor, the regulating moment of the low-pressure high-flow overflow valve under each pressure value is measured through the moment measuring instrument, and a regulating pressure-regulating moment characteristic curve is drawn by a dotting method.
Further, the data acquisition device acquires real-time values of an inlet pressure sensor, an outlet pressure sensor, an oil inlet filter, an oil return filter and a bypass filter, respectively acquires feedback values from the pressure sensor and differential pressure feedback values of the filters, grasps the differential pressure before and after the low-pressure large-flow overflow valve in real time through the pressure feedback values, controls the system in real time through the differential pressure feedback values, and when the differential pressure feedback values exceed a system set value, the industrial personal computer immediately alarms and early warns to remind that the system is abnormal and closes the test system.
Further, the data acquisition device acquires real-time numerical values of the temperature sensor, acquires feedback values of the temperature sensor, grasps the temperature of the test system in real time through the temperature feedback values, compares the temperature feedback values with preset temperature values when the industrial personal computer receives the temperature feedback values transmitted by the data acquisition device, gives an opening instruction to the control device when the temperature feedback values reach the upper limit value of the preset temperature values, starts the motor of the temperature control module, starts the temperature control module to circularly cool the oil source, gives a closing instruction to the control device when the temperature feedback values reach the lower limit value of the preset temperature values, closes the motor of the temperature control module, and starts the temperature control module to heat the oil source.
The technical scheme of the invention has the beneficial effects that:
1. the invention can be used for factory tests and model tests, and can be used for carrying out pressure regulation range and pressure stability tests, internal leakage quantity tests, pressure loss tests, steady-state pressure-flow characteristic tests, transient response tests and pressure regulation-moment regulation tests on the low-pressure high-flow overflow valve, and the measurement tests are accurate, so that the accuracy and the no-error performance test of the low-pressure high-flow overflow valve product can be ensured;
2. besides the experiment, the control system has the effect of stable and reliable operation, and the industrial personal computer is connected with the data acquisition device and the control device to form a feedback control loop. The data acquisition device acquires real-time values of an inlet pressure sensor, an outlet pressure sensor, an oil inlet filter, an oil return filter and a bypass filter, respectively acquires feedback values from the pressure sensor and differential pressure feedback values of the filters, grasps the front differential pressure and the rear differential pressure of the low-pressure high-flow overflow valve in real time through the pressure feedback values, controls the system in real time through the differential pressure feedback values, and when the differential pressure feedback values exceed a system set value, the industrial personal computer immediately alarms and early warns that the system is abnormal, and closes the test system; the data acquisition device acquires real-time numerical values of the temperature sensor, acquires feedback values of the temperature sensor, grasps the temperature of the test system in real time through the temperature feedback values, compares the temperature feedback values with preset temperature values when the industrial personal computer receives the temperature feedback values transmitted by the data acquisition device, gives an opening instruction to the control device when the temperature feedback values reach the upper limit value of the preset temperature values, starts the motor of the temperature control module, starts the temperature control module to circularly cool the oil source, gives a closing instruction to the control device when the temperature feedback values reach the lower limit value of the preset temperature values, closes the motor of the temperature control module, and starts the temperature control module to heat the oil source
3. According to the invention, the structure optimization is realized, the poppet valve is modified, the overflow valve is added, the pressurized oil pipeline is directly connected with the oil tank, the poppet valve is reduced to be pressurized, and the system pressure can be quickly reduced through the poppet valve when a transient response test is performed, so that the index requirement that the response time of the low-pressure high-flow overflow valve is not more than 100ms is met.
4. According to the test system, the volume of the oil tank is 3000L, the test temperature is required to be 50+/-4 ℃, the influence on the test process caused by the fact that the temperature rise time of the traditional test is as long as 7-8 hours is avoided, the temperature control module of the system is designed, the temperature rise time of the system is reduced to about 2 hours, the working efficiency is greatly improved, the temperature control system is also fed back in real time according to the temperature change of the system, when the temperature is reduced to 46 DEG of the set minimum working temperature, the control device is fed back, the industrial personal computer gives an early warning, and the temperature control system is automatically started to heat the system; when the test temperature exceeds the set highest temperature of 54 degrees, the temperature control system is automatically started to cool the system, and the test temperature requirement is met.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings that are required for the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a system of the present invention;
in the figure: 1-butterfly valve, 2-main way variable frequency motor, 3-check valve, 4-oil inlet way filter, 5-ball valve, 6-accumulator, 7-first little ball valve, 8-little flowmeter, 9-second little ball valve, 10-first big ball valve, 11-big flowmeter, 12-second big ball valve, 13-temperature sensor, 14-inlet pressure sensor, 15-low pressure high-flow overflow valve, 16-outlet pressure sensor, 17-main way manometer, 18-oil inlet way triple flow valve, 19-main way overflow valve, 20-temperature control module, 21-oil return way filter, 22-oil return way triple flow valve, 23-drain valve, 24-poppet valve, 25-electromagnetic reversing valve, 26-bypass filter, 27-accumulator, 28-bypass hydraulic pump, 29-bypass manometer, 30-bypass overflow valve, 31-industrial computer, 32-controlling device, 33-data acquisition device.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
Low pressure high flow relief valve system requires:
1. the maximum test of the overflow valve is satisfied within the range of 4Bar to 12Bar of the regulating pressure of the overflow valve
The flow rate is 450L/min;
2. the test working flow is 200L/min;
3. the system poppet response time is no greater than 10ms;
4. the adjustable range of the system pressure is 0-1.8 MPa;
5. the pressure adjustable range of the overflow valve of the poppet valve is 0-5 MPa;
6. the requirement that the transient response time of the overflow valve is not more than 100ms is met;
7. and the pressure regulating range, pressure stability, internal leakage quantity, pressure loss, steady-state pressure-flow characteristic, tightness, regulating moment and durability test of the low-pressure high-flow direct-acting overflow valve are completed, and the requirements of test parameters are met.
Embodiment 1, a low pressure large-flow overflow valve test system, as shown in fig. 1, includes a circulation loop and a signal acquisition control module that link to each other with low pressure large-flow overflow valve 15, the circulation loop includes main way pump oil unit, test unit, oil return unit, the temperature control module 20 that connect gradually, and main way pump oil unit and oil return unit link to each other through the oil tank, temperature control module 20 sets up in the oil tank. The signal acquisition control module comprises a data acquisition device 32, a control device 33 and an industrial personal computer 31, and the three form a feedback control loop.
The main way oil pumping unit comprises a main way hydraulic pump driven by the main way variable frequency motor 2, an oil inlet way triple flow valve 18, a main way pressure gauge 17 and a main way overflow valve 19 are arranged in parallel with the main way hydraulic pump, and the flow and the pressure of the system can be regulated by controlling the main way variable frequency motor 2, the oil inlet way triple flow valve 18 and the main way overflow valve 19. The main hydraulic pump is a screw pump, a butterfly valve 1 is arranged between the screw pump and the oil tank, the output end of the screw pump is sequentially connected with a one-way valve 3, an oil inlet filter 4 for feeding back differential pressure and a ball valve 5, the oil inlet filter 4 and the oil inlet filter 4 are connected with a data acquisition device 32, and the main variable frequency motor 2 and a main overflow valve 19 are connected with a control device 33. The industrial personal computer 31 sends instructions to the control device 33 according to the actual measurement data acquired by the data acquisition device 32, and the control device 33 controls the system pressure and flow. The oil return unit comprises an oil return filter 21 for feeding back differential pressure, the oil return filter 21 is connected with an oil return triple flow valve 22 in parallel, and the oil return filter 21 is connected with a data acquisition device 32.
The test unit is provided with a low-pressure high-flow overflow valve 15, a temperature sensor 13, an inlet pressure sensor 14 and an outlet pressure sensor 16 which are positioned at the front end and the rear end of the low-pressure high-flow overflow valve 15, wherein the temperature sensor 13 is used for measuring the temperature of the system, and the inlet pressure sensor 14 and the outlet pressure sensor 16 are respectively used for measuring the pressure at the front end and the rear end of the low-pressure high-flow overflow valve 15. A drain valve 23 is arranged between the outlet pressure sensor 16 and the oil return section and is used for the leakage test and the steady-state pressure-flow characteristic test in the low-pressure high-flow overflow valve 15. Specifically, the front end of the low-pressure large-flow overflow valve 15 is connected in parallel with a large-flow channel and a small-flow channel, the large-flow channel and the small-flow channel are both provided with a flowmeter and a valve for controlling on-off, the small-flow channel is sequentially provided with a first small ball valve 7, a small flowmeter 8 and a second small ball valve 9, and the large-flow channel is sequentially provided with a first large ball valve 10, a large flowmeter 11 and a second large ball valve 12.
A transient response module is arranged in parallel with the test unit, the transient response module comprises a lifting valve 24, and a control end of the lifting valve 24 is connected with a bypass oil pumping unit through an electromagnetic directional valve 25. The data acquisition device 32 is connected with the small flowmeter 8, the large flowmeter 11, the temperature sensor 13, the inlet pressure sensor 14 and the outlet pressure sensor 16, and the control device 33 is connected with the main oil pumping unit, the temperature control module 20, the bypass oil pumping unit and the electromagnetic directional valve 25.
The bypass oil pumping unit comprises a bypass hydraulic pump 28 driven by a bypass variable frequency motor, and the bypass hydraulic pump 28 is a screw pump. An accumulator 27, a bypass filter 26 for feeding back differential pressure and an electromagnetic directional valve 25 are sequentially connected between the output end of the bypass hydraulic pump 28 and the control end of the poppet valve 24, and a bypass pressure gauge 29 and a bypass overflow valve 30 connected with an oil return path are arranged between the electromagnetic directional valve 25 and the bypass filter 26. The bypass variable frequency motor and the bypass overflow valve 30 are connected with a control device 33, and the bypass filter 26 and the bypass pressure gauge 29 are connected with a data acquisition device 32.
In order to ensure the stable running pressure of the system, the data acquisition device 32 acquires real-time values of the inlet pressure sensor 14, the outlet pressure sensor 16, the oil inlet filter 4, the oil return filter 21 and the bypass filter 26, respectively acquires feedback values from the pressure sensor and differential pressure feedback values of the filters, grasps the front differential pressure and the rear differential pressure of the low-pressure high-flow overflow valve 15 in real time through the pressure feedback values, controls the system in real time through the differential pressure feedback values, and when the differential pressure feedback values exceed the system set values, the industrial personal computer 31 immediately alarms and gives an early warning to remind that the system is abnormal, and closes the test system.
In order to ensure the reliability of the system temperature, the data acquisition device 32 acquires the real-time value of the temperature sensor 13, acquires the feedback value of the temperature sensor, grasps the temperature of the test system in real time through the temperature feedback value, when the industrial personal computer 31 receives the temperature feedback value transmitted by the data acquisition device 32, the industrial personal computer 31 compares the temperature feedback value with a preset temperature value, when the temperature feedback value reaches the upper limit value of the preset temperature value, the industrial personal computer 31 gives an opening instruction to the control device 32, starts the motor of the temperature control module 20, starts the temperature control module 20 to circularly cool the oil source, when the temperature feedback value reaches the lower limit value of the preset temperature value, the industrial personal computer 31 gives a closing instruction to the control device 32, closes the motor of the temperature control module 20, and starts the temperature control module 20 to heat the oil source.
Example 2 a test method of a low pressure high flow relief valve test system includes a pressure adjustment range and pressure stability test of the low pressure high flow relief valve 15, an internal leakage test of the low pressure high flow relief valve 15, and a pressure loss test of the low pressure high flow relief valve 15.
1.1 Test environment
Except for the environmental suitability test, the rest of the tests were carried out under laboratory conditions of ambient temperature, humidity and air pressure. The environmental suitability test is carried out according to the corresponding part in GJB150A-2009 "environmental test method of military equipment laboratory".
1.2 Test medium
Test medium: CD40 diesel engine oil (GB-11122-2006), 4450 aviation gear oil (GJB 561-1988).
Test medium temperature: the system oil temperature is 55+/-5 ℃.
Test media contamination degree: should not be higher than the relevant regulations of GB/T14039 "pollution grade code of solid particles of hydraulic transmission oil". A sufficient number and type of filters should be installed in the test circuit to control the contamination level of the test medium.
1.3 When the pressure regulating range and the pressure stability test are performed on the low-pressure high-flow overflow valve 15
The large flow channel is opened, the small flow pipeline is closed, the main way overflow valve 19 is regulated to be fully tight, the low-pressure large flow overflow valve 15 is regulated to be fully loose, the rotating speed of the main way variable frequency motor 2 is controlled by the control device 33, and meanwhile, the flow of the test system is a certain value in the range of 100-300L/min, preferably 200L/min through monitoring of the flowmeter on the large flow channel. The measured values of flow, temperature and pressure fed back by the flow meter, the temperature sensor 13, the inlet pressure sensor 14 or the outlet pressure sensor 16 on the large-flow channel are collected through the data collecting device 32 and uploaded to the industrial personal computer 31, and a temperature, flow and pressure curve is generated in real time.
1.4 When the internal leakage amount test is performed on the low-pressure large-flow overflow valve 15
The small flow pipeline is opened, the large flow channel is closed, the main flow valve 19 is regulated to be fully tight, the inlet pressure of the low-pressure large flow valve 15 is regulated to be a certain value within the range of 0.6-1.8MPa, the measured value of the inlet pressure sensor 14 is displayed on the industrial personal computer 31 through the data acquisition device 32, the rotating speed of the main frequency conversion motor 2 is controlled through the control device 33, and meanwhile, the flow of the test system is enabled to be a certain value within the range of 100-300L/min, preferably 200L/min through monitoring of the flowmeter on the small flow channel. The main relief valve 19 is then adjusted to bring the system pressure down to 50-80%, preferably 75%, of the upper pressure regulation limit of the low pressure high flow relief valve 15. Because the inlet pressure of the low-pressure large-flow overflow valve 15 is reduced, the valve core of the low-pressure large-flow overflow valve 15 is closed under the action of the regulating spring and the back pressure of the low-pressure large-flow overflow valve 15, and at the moment, flow data fed back by the flowmeter on the small flow channel is acquired through the data acquisition device 32, namely the internal leakage quantity of the low-pressure large-flow overflow valve 15.
If the internal leakage of the low-pressure large-flow overflow valve 15 exceeds the accuracy range which can be acquired by the flowmeter on the small-flow channel, the drain valve 23 is opened, an internal leakage test is performed, and the amount of the oil discharged from the drain valve 23 is measured to be the internal leakage of the low-pressure large-flow overflow valve 15.
1.5 When the pressure loss test is carried out on the low-pressure large-flow overflow valve 15, a large-flow channel is opened, a small-flow channel is closed, the main-path overflow valve 19 is regulated to be fully tight, the low-pressure large-flow overflow valve 15 is regulated to be fully loose, the rotating speed of the main-path variable frequency motor 2 is controlled through the control device 33, and meanwhile, the flow of a test system is enabled to be a certain value within the range of 100-300L/min, preferably 200L/min through monitoring of a flowmeter on the large-flow channel. The measured values fed back by the inlet pressure sensor 14 and the outlet pressure sensor 16 are collected through the data collecting device 32 and uploaded to the industrial personal computer 31, and the actual measured pressure is read and displayed on the industrial personal computer 31 in real time to generate a pressure loss test curve in real time.
The structure of the low-pressure large-flow overflow valve test system in this embodiment is the same as that in embodiment 1.
Embodiment 3, a test method of a low-pressure high-flow overflow valve test system, which comprises steady-state pressure-flow characteristic test of a low-pressure high-flow overflow valve 15, during test, opening a high-flow pipeline, closing a low-flow pipeline, adjusting a main-path overflow valve 19 to be fully tight, adjusting the low-pressure high-flow overflow valve 15 to be an upper-limit value, controlling the rotating speed of a main-path variable frequency motor 2 through a control device 33, and simultaneously, monitoring a flowmeter on a high-flow channel to enable the flow of the test system to be a certain value in the range of 100-300L/min, preferably 200L/min, and performing the following test:
a. The main way overflow valve 19 is regulated to gradually reduce the system pressure to the closing rate pressure of the low-pressure large-flow overflow valve 15, the large-flow pipeline is closed, the small-flow pipeline is opened at the same time, the actual measurement values of the flow and the pressure fed back by the flowmeter, the inlet pressure sensor 14 or the outlet pressure sensor 16 on the small-flow channel are collected through the data collecting device 32 and uploaded to the industrial personal computer 31, and a pressure-flow characteristic curve is generated in real time;
if the internal leakage of the low-pressure large-flow overflow valve 15 exceeds the accuracy range which can be acquired by the flowmeter on the small-flow channel, opening the drain valve 23 to perform a steady-state pressure-flow characteristic test, measuring the oil liquid amount discharged from the drain valve 23, and drawing a steady-state pressure-flow characteristic curve by a dotting method;
b. and when the flow does not meet the flow of the test system, the large-flow channel is opened, the small-flow channel is closed, and a steady-state pressure-flow characteristic curve is recorded in real time through the industrial personal computer.
In this example, the structure of the low-pressure large-flow-rate overflow valve test system was the same as in example 1, and the other test methods for the low-pressure large-flow-rate overflow valve were the same as in example 2.
Embodiment 4, a test method of a low-pressure high-flow overflow valve test system, further comprising a transient response test of the low-pressure high-flow overflow valve, wherein during the test, the main way overflow valve 19 is adjusted to raise the pressure of the system to 1-2 times, preferably 1.5 times, of the rated pressure of the system, a high-flow channel is opened, and a low-flow channel is closed;
the low-pressure high-flow overflow valve 15 is regulated to an upper limit value, and meanwhile, a frequency button on the industrial personal computer 31 is regulated, and the rotating speed of the main-path variable frequency motor 2 is regulated through the control device 33, so that the system test flow is a certain value in the range of 100-300L/min, preferably 200L/min;
the bypass hydraulic pump 28 is started, the bypass overflow valve 30 is regulated, the pressure of the poppet valve 24 can ensure that the action test of the poppet valve 24 meets the requirement of 10ms, when the control device 33 controls the electromagnetic directional valve 25 to be electrified, the control end of the poppet valve 24 is unloaded, the poppet valve 24 is opened, a test system is unloaded, the inlet pressure of the low-pressure high-flow overflow valve 15 cannot exceed the upper limit value of the pressure regulating range of 20%, then the control device 33 controls the electromagnetic directional valve 25 to be powered off and reset, the poppet valve 24 is rapidly closed from an open state, the inlet of the low-pressure high-flow overflow valve 15 generates a pressure step, the measured values of the flow rate, the temperature and the pressure fed back by the flow meter, the temperature sensor 13, the inlet pressure sensor 14 and the outlet pressure sensor 16 on a large-flow channel are collected through the data collecting device 32 and uploaded to the industrial personal computer 31, the change process of the inlet pressure of the low-pressure high-flow overflow valve 15 is recorded, the response characteristic curve of the inlet pressure is generated, the response time, the transient recovery time and the measured value of the pressure overshoot is recorded, and whether the performance of the overflow valve is qualified or not is judged, and the industrial personal computer 31 is used for analyzing the test data.
In this example, the structure of the low-pressure large-flow-rate overflow valve test system was the same as in example 1, and the other test methods for the low-pressure large-flow-rate overflow valve were the same as in example 3.
Embodiment 5, a test method of a low-pressure high-flow overflow valve test system, further comprising a pressure-adjusting torque adjusting test of the low-pressure high-flow overflow valve, wherein during the test, a high-flow channel is opened, a low-flow channel is closed at the same time, and the main-way overflow valve 19 is adjusted to increase the system pressure to 1-1.5 times, preferably 1.15 times, the rated system pressure. The low-pressure large-flow overflow valve 15 is fully opened, and meanwhile, the frequency button on the industrial personal computer 31 is adjusted, and the rotating speed of the main-path variable frequency motor 2 is adjusted through the control device 33, so that the system test flow is a certain value in the range of 100-300L/min, preferably 200L/min. Simultaneously, the oil return channel triple flow valve 22 is regulated to ensure that the outlet pressure of the low-pressure large-flow overflow valve 15 is a certain value in the range of 0.2-0.8MPa, preferably 0.5MPa;
the low-pressure high-flow overflow valve 15 is regulated by a moment measuring instrument and a connecting tool, so that the inlet pressure of the low-pressure high-flow overflow valve 15 is increased from the lower limit value to the upper limit value of a pressure regulating range and then is reduced from the upper limit value to the lower limit value, at least 6 pressure values are selected in the pressure regulating range, the inlet pressure sensor 14, the flow sensor 11 and the outlet pressure sensor 16 measure the inlet pressure, the outlet pressure and the flow under each selected pressure value, the regulating moment of the low-pressure high-flow overflow valve 15 under each pressure value is measured by the moment measuring instrument, and a regulating pressure-regulating moment characteristic curve is drawn by a dotting method.
In this example, the structure of the low-pressure large-flow-rate overflow valve test system was the same as in example 1, and the other test methods for the low-pressure large-flow-rate overflow valve were the same as in example 4.
The present invention is not limited to the conventional technical means known to those skilled in the art.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (3)
1. The low-pressure large-flow overflow valve test system comprises a circulation loop and a signal acquisition control module, wherein the circulation loop is connected with a low-pressure large-flow overflow valve (15), and is characterized in that the low-pressure large-flow overflow valve test system has the following requirements:
(1) the maximum test flow of the overflow valve is 450L/min within the range of 4Bar to 12Bar of the regulating pressure of the overflow valve;
(2) the test working flow is 200L/min;
(3) the system poppet response time is not greater than 10ms;
(4) the adjustable range of the system pressure is 0-1.8 MPa;
(5) the pressure adjustable range of the poppet overflow valve is 0-5 MPa;
(6) the requirement that the transient response time of the overflow valve is not more than 100ms is met;
(7) The pressure regulating range, pressure stability, internal leakage quantity, pressure loss, steady-state pressure-flow characteristic, tightness, regulating moment and durability test of the low-pressure large-flow direct-acting overflow valve are completed, and the requirements of test parameters are met;
the circulating loop comprises a main path oil pumping unit, a testing unit, an oil return unit and a temperature control module (20) which are sequentially connected, wherein the testing unit is provided with a low-pressure high-flow overflow valve (15), a temperature sensor (13), an inlet pressure sensor (14) and an outlet pressure sensor (16) which are positioned at the front end and the rear end of the low-pressure high-flow overflow valve (15), a drain valve (23) is arranged between the outlet pressure sensor (16) and the oil return section, a transient response module is arranged in parallel with the testing unit, the transient response module comprises a lifting valve (24), the control end of the lifting valve (24) is connected with a bypass oil pumping unit through an electromagnetic reversing valve (25), the front end of the low-pressure high-flow overflow valve (15) is connected with a high-flow channel and a low-flow channel in parallel, the high-flow channel and the low-flow channel are respectively provided with a flowmeter and a valve for controlling on-off, the signal acquisition control module comprises a data acquisition device (32), a control device (33) and an industrial personal computer (31), the data acquisition device (32) is connected with the flowmeter, the temperature sensor (13), the inlet pressure sensor (14) and the outlet pressure sensor (16), the control device is connected with the control unit, the electromagnetic reversing valve (25) and the main path oil pumping unit (20);
The main way oil pumping unit comprises a main way hydraulic pump driven by a main way variable frequency motor (2), an oil inlet way triple flow valve (18), a main way pressure gauge (17) and a main way overflow valve (19) are arranged in parallel with the main way hydraulic pump, the output end of the main way hydraulic pump is sequentially connected with a one-way valve (3) and an oil inlet way filter (4) for feeding back differential pressure, the oil inlet way filter (4) and the main way pressure gauge (17) are connected with a data acquisition device (32), and the main way overflow valve (19) and the main way variable frequency motor (2) are connected with a control device (33);
the bypass oil pumping unit comprises a bypass hydraulic pump (28) driven by a bypass variable frequency motor, an energy accumulator (27), a bypass filter (26) for feeding back pressure difference and an electromagnetic reversing valve (25) are sequentially connected between the output end of the bypass hydraulic pump (28) and the control end of the lifting valve (24), a bypass pressure gauge (29) and a bypass overflow valve (30) connected with an oil return path are arranged between the electromagnetic reversing valve (25) and the bypass filter (26), the bypass variable frequency motor and the bypass overflow valve (30) are connected with a control device (33), and the bypass filter (26) and the bypass pressure gauge (29) are connected with a data acquisition device (32);
The oil return unit comprises an oil return filter (21) for feeding back differential pressure, the oil return filter (21) is connected with an oil return triple flow valve (22) in parallel, and the oil return filter (21) is connected with a data acquisition device (32);
the test method of the low-pressure high-flow overflow valve test system comprises the steps of a pressure regulating range of the low-pressure high-flow overflow valve (15), a pressure stability test, an internal leakage test of the low-pressure high-flow overflow valve (15) and a pressure loss test of the low-pressure high-flow overflow valve (15);
when the low-pressure large-flow overflow valve (15) is subjected to pressure regulation range and pressure stability test, a large-flow channel is opened, a small-flow pipeline is closed, the main-path overflow valve (19) is regulated to be fully tight, the low-pressure large-flow overflow valve (15) is regulated to be fully loose, the rotating speed of the main-path variable frequency motor (2) is controlled through a control device (33), meanwhile, the flow of a test system is a certain value in the range of 100-300L/min through monitoring of a flow meter on the large-flow channel, the measured values of the flow, the temperature and the pressure fed back by the flow meter, the temperature sensor (13), the inlet pressure sensor (14) or the outlet pressure sensor (16) are collected through a data collecting device (32), and are uploaded to an industrial personal computer (31) to generate a temperature, flow and pressure curve in real time;
When the low-pressure large-flow overflow valve (15) is subjected to an internal leakage test, a small-flow pipeline is opened, a large-flow channel is closed, the main-path overflow valve (19) is regulated to be fully tight, the inlet pressure of the low-pressure large-flow overflow valve (15) is regulated to be a certain value within the range of 0.6-1.8MPa, the measured value of the inlet pressure sensor (14) is displayed on an industrial personal computer (31) through a data acquisition device (32), the rotating speed of the main-path variable frequency motor (2) is controlled through a control device (33), meanwhile, the flow rate of a test system is made to be a certain value within the range of 100-300L/min through monitoring of a flowmeter on the small-flow channel, then the main-path overflow valve (19) is regulated, the system pressure is reduced to be 50-80% of the upper regulation limit value of the low-pressure large-flow overflow valve (15), and the valve core of the low-pressure large-flow overflow valve (15) is closed under the action of a regulating spring and back pressure of the low-pressure large-flow overflow valve (15), and the low-pressure large-flow overflow valve (15) is collected through the data acquisition device (32) at the moment; if the internal leakage of the low-pressure large-flow overflow valve (15) exceeds the accuracy range which can be acquired by the flowmeter on the small-flow channel, opening the drain valve (23), performing an internal leakage test, and measuring the oil liquid amount discharged from the drain valve (23) to obtain the internal leakage of the low-pressure large-flow overflow valve (15);
When the low-pressure large-flow overflow valve (15) is subjected to a pressure loss test, a large-flow channel is opened, a small-flow channel is closed, the main-path overflow valve (19) is regulated to be fully tight, the low-pressure large-flow overflow valve (15) is regulated to be fully loose, the rotating speed of the main-path variable frequency motor (2) is controlled through a control device (33), meanwhile, the flow of a test system is a certain value in the range of 100-300L/min through monitoring a flowmeter on the large-flow channel, the actual measurement values fed back by an inlet pressure sensor (14) and an outlet pressure sensor (16) are collected through a data collecting device (32) and are uploaded to an industrial personal computer (31), and the actual measurement of the pressure is read and displayed on the industrial personal computer (31) in real time, so that a pressure loss test curve is generated in real time;
the test method of the low-pressure large-flow overflow valve test system further comprises steady-state pressure-flow characteristic test of the low-pressure large-flow overflow valve (15), during the test, a large-flow pipeline is opened, a small-flow pipeline is closed, the main-path overflow valve (19) is regulated to be fully tight, the low-pressure large-flow overflow valve (15) is regulated to be an upper regulation limit value, the rotating speed of the main-path variable frequency motor (2) is controlled through a control device (33), and meanwhile, the flow of the test system is enabled to be a certain value in the range of 100-300L/min through monitoring of a flowmeter on a large-flow channel, and the following test is carried out:
a) The main way overflow valve (19) is regulated to gradually reduce the system pressure to the closing rate pressure of the low-pressure high-flow overflow valve (15), the high-flow pipeline is closed, the low-flow pipeline is opened at the same time, the actual measurement values of the flow and the pressure fed back by the flowmeter, the inlet pressure sensor (14) or the outlet pressure sensor (16) on the low-flow channel are collected through the data collecting device (32), and the actual measurement values are uploaded to the industrial personal computer (31) to generate a pressure-flow characteristic curve in real time;
if the internal leakage of the low-pressure large-flow overflow valve (15) exceeds the accuracy range which can be acquired by the flowmeter on the small-flow channel, opening the drain valve (23) to perform a steady-state pressure-flow characteristic test, measuring the oil liquid amount discharged from the drain valve (23), and drawing a steady-state pressure-flow characteristic curve by a dotting method;
b) The main way overflow valve (19) is regulated, when the system pressure is gradually increased to the pressure under the opening rate of the low-pressure large-flow overflow valve (15), the actual measurement value of the flowmeter on the small-flow channel is collected through the data collection device (32) and uploaded to the industrial personal computer, when the flow does not meet the flow of the test system, the large-flow channel is opened, the small-flow channel is closed, and the steady-state pressure-flow characteristic curve is recorded in real time through the industrial personal computer;
The test method of the low-pressure high-flow overflow valve test system further comprises a transient response test of the low-pressure high-flow overflow valve, and during the test, the main way overflow valve (19) is adjusted to enable the system pressure to be 1-2 times of the rated system pressure, a high-flow channel is opened, and a low-flow channel is closed;
the low-pressure high-flow overflow valve (15) is regulated to an upper limit value, meanwhile, a frequency button on the industrial personal computer (31) is regulated, and the rotating speed of the main variable frequency motor (2) is regulated through the control device (33) so that the system test flow is a certain value in the range of 100-300L/min;
the method comprises the steps of starting a bypass hydraulic pump (28), adjusting a bypass overflow valve (30), enabling the pressure of a poppet valve (24) to ensure that an action test of the poppet valve (24) meets the requirement of 10ms, unloading a control end of the poppet valve (24) when an industrial personal computer (31) controls an electromagnetic reversing valve (25) to be electrified through a control device (33), opening the poppet valve (24), unloading a test system, enabling the inlet pressure of a low-pressure large-flow overflow valve (15) not to exceed the upper limit value of a pressure regulating range of 20%, controlling the electromagnetic reversing valve (25) to be powered off and reset through the control device (33), enabling the poppet valve (24) to be rapidly closed from an open state, enabling an inlet of the low-pressure large-flow overflow valve (15) to generate a pressure step, acquiring flow, temperature and pressure values fed back by the inlet pressure sensor (14) and an outlet pressure sensor (16) through a data acquisition device (32), uploading the flow, temperature and pressure values fed back by the industrial personal computer (31), recording the change process of the inlet pressure of the low-pressure large-flow valve (15), generating an inlet pressure response characteristic curve, recording the actual measurement time and the transient state response curve, and judging whether the transient state of the industrial personal computer is qualified or not, and the transient state response curve is analyzed;
The test method of the low-pressure large-flow overflow valve test system further comprises a pressure regulation and torque regulation test of the low-pressure large-flow overflow valve, during the test, a large-flow channel is opened, a small-flow channel is closed at the same time, the main-path overflow valve (19) is regulated to enable the system pressure to be 1-1.5 times of the rated pressure of the system, the low-pressure large-flow overflow valve (15) is regulated to be fully opened, meanwhile, a frequency button on the industrial personal computer (31) is regulated, the rotating speed of the main-path variable frequency motor (2) is regulated through the control device (33), the test flow of the system is enabled to be a certain value in the range of 100-300L/min, and meanwhile, the oil return triple flow valve (22) is regulated to enable the outlet pressure of the low-pressure large-flow overflow valve (15) to be a certain value in the range of 0.2-0.8 MPa;
the low-pressure high-flow overflow valve (15) is regulated through a moment measuring instrument and a connecting tool, so that the inlet pressure of the low-pressure high-flow overflow valve (15) is increased from the lower limit value to the upper limit value of a pressure regulating range, then is reduced from the upper limit value to the lower limit value, at least 6 pressure values are selected in the pressure regulating range, the inlet pressure sensor (14), the flow sensor (11) and the outlet pressure sensor (16) measure the inlet pressure, the outlet pressure and the flow under the selected pressure values, the regulating moment of the low-pressure high-flow overflow valve (15) under the pressure values is measured through the moment measuring instrument, and a regulating pressure-regulating moment characteristic curve is drawn by a dotting method.
2. The low pressure, high flow relief valve test system of claim 1, wherein: the data acquisition device (32) acquires real-time values of the inlet pressure sensor (14), the outlet pressure sensor (16), the oil inlet filter (4), the oil return filter (21) and the bypass filter (26), respectively acquires feedback values from the pressure sensor and differential pressure feedback values of the filters, grasps the front and rear differential pressure of the low-pressure large-flow overflow valve (15) in real time through the pressure feedback values, controls the system in real time through the differential pressure feedback values, and when the differential pressure feedback values exceed a system set value, the industrial personal computer (31) immediately alarms and early warns that the system is abnormal, and closes the test system.
3. The low pressure, high flow relief valve test system of claim 1, wherein: the data acquisition device (32) acquires real-time numerical values of the temperature sensor (13), acquires feedback values of the temperature sensor, grasps the temperature of the test system in real time through the temperature feedback values, compares the temperature feedback values with preset temperature values when the industrial personal computer (31) receives the temperature feedback values transmitted by the data acquisition device (32), and when the temperature feedback values reach the upper limit value of the preset temperature values, the industrial personal computer (31) gives an opening instruction to the control device (32), starts a motor of the temperature control module (20), starts the temperature control module (20) to circularly cool an oil source, and when the temperature feedback values reach the lower limit value of the preset temperature values, the industrial personal computer (31) gives a closing instruction to the control device (32), closes the motor of the temperature control module (20) and starts the temperature control module (20) to heat the oil source.
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