CN110778572B - Reliability and service life testing device for hydraulic valve matching parts - Google Patents
Reliability and service life testing device for hydraulic valve matching parts Download PDFInfo
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- CN110778572B CN110778572B CN201911051116.7A CN201911051116A CN110778572B CN 110778572 B CN110778572 B CN 110778572B CN 201911051116 A CN201911051116 A CN 201911051116A CN 110778572 B CN110778572 B CN 110778572B
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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
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Abstract
The invention belongs to the technical field of hydraulic tests, and particularly relates to a device for testing the reliability and the service life of a hydraulic valve matching part. The device comprises a power distribution system (1), a fuel system (2), a heat-conducting oil temperature control device (3), a remote test and equipment management system (4) and a valve driving device (5); the test piece is arranged in the valve driving device (5), the fuel oil system (2) is started to enable the periphery of the test piece to be filled with fuel oil, the test piece is heated to a target temperature through the heat conduction oil temperature control device (3), the remote test and equipment management system (4) sets test parameters, and the valve driving device (5) is controlled to carry out reliability and service life tests; the power distribution system (1) supplies power to the whole test device. The test device provided by the invention is adopted for testing, so that the examination time of the life test is reduced, and the test efficiency is improved; the research and development period of the valve matching part product is shortened. The method has the advantages of wide application range and good compatibility.
Description
Technical Field
The invention belongs to the technical field of hydraulic tests, and particularly relates to a device for testing the reliability and the service life of a hydraulic valve matching part.
Background
Valve couples are commonly used in hydraulic systems as control elements and are widely used in aircraft engine fuel regulators. The valve matching parts have different functions, such as a constant pressure valve and a differential pressure valve which are used for controlling the pressure of a medium in a hydraulic circuit, a conversion valve which is used for controlling the switching of the hydraulic circuit, and a flow metering valve which is used for accurately metering the flow of the medium.
The structural components of the valve coupling part generally comprise a valve, a bushing, a sealing element and other parts. When the valve matching part works, the opening degree of the window is controlled through the movement of the valve, so that the flow resistance is adjusted, and the effect of controlling the flow, the pressure or the opening and closing of the fluid medium is achieved.
Failure modes of the valve matching parts generally comprise clamping stagnation, leakage, eccentric wear and the like. If the metering valve is blocked, the flow is not controlled and the rising and returning hysteresis is large; if the differential pressure valve is stuck, the difference between the flow change and the expected flow is large, which affects the performance and safety of the aircraft engine. In order to verify the service life and reliability of the valve matching parts, the related performance of the valve matching parts needs to be tested. At present, in the aircraft engine hydraulic part test industry, a precedent for providing service life test conditions for valve matching parts is not available.
Disclosure of Invention
The purpose of the invention is:
the invention aims to provide a reliability and service life testing device suitable for a valve matching part, which can be used in a reliability and service life testing environment for long-term working of the valve matching part under the conditions of certain temperature and pressure of a fuel medium.
The technical scheme of the invention is as follows:
a hydraulic valve matching part reliability and service life test device comprises a power distribution system (1), a fuel system (2), a heat conduction oil temperature control device (3), a remote test and equipment management system (4) and a valve driving device (5); the test piece is arranged in the valve driving device (5), the fuel oil system (2) is started to enable the periphery of the test piece to be filled with fuel oil, the test piece is heated to a target temperature through the heat conduction oil temperature control device (3), the remote test and equipment management system (4) sets test parameters, and the valve driving device (5) is controlled to carry out reliability and service life tests; the power distribution system (1) supplies power to the whole test device.
The valve driving device (5) comprises a rotating motor (5-1), a heat exchange shell (5-3) with a fin plate, a lining tool (5-5), a first high-temperature bearing (5-6), a second high-temperature bearing (5-8), a joint bearing (5-11), an end cover (5-13), a linear driving module (5-14), an oil bath groove (5-21) and an installation platform (5-25);
the assembly relation is as follows: the oil bath groove (5-21) is of a hollow cuboid structure, an oil inlet and an oil outlet are formed in the side wall, a coaxial through hole is formed in the upper end and the lower end, and a flange is further arranged on the through hole;
the oil bath groove (5-21) is arranged on the mounting platform (5-25), the heat exchange shell (5-3) with the fin plate is arranged in the oil bath groove (5-21), and two ends of the heat exchange shell are fixed on the flanges; the valve (5-19) and the bushing (5-20) of the test piece are installed in a bushing tool (5-5), high-temperature bearings are respectively installed at two ends of the bushing tool (5-5) and integrally fixed in a finned plate heat exchange shell (5-3), and the rotating motor (5-1) is connected to the lower end of the bushing tool (5-5) through a bushing driving rod and drives the bushing tool (5-5) to rotate; the linear driving module (5-14) is connected to the valve (5-19) through a valve driving rod (5-12) and a joint bearing (5-11) and drives the valve to reciprocate; the upper end of the heat exchange shell (5-3) with the finned plate is sealed by an end cover (5-13), the lower end of the heat exchange shell is provided with a fuel oil inlet and a fuel oil outlet, and the heat exchange shell (5-3) with the finned plate is filled with fuel oil.
When the testing device provided by the invention is adopted to carry out the reliability or service life test of the valve, the operation is carried out according to the following steps:
a) completing the installation of the tested piece valve couple;
b) calibrating the position of the valve, and determining the zero point and the displacement range of the valve;
c) starting a fuel system (2) to ensure that the valve matching part tool is full of fuel;
d) starting a heat conduction oil temperature control device (3), setting the temperature and the heating speed of fuel oil, and heating the fuel oil to a target temperature;
e) setting the operation amplitude, frequency and total operation time (or reciprocating times) of the valve matching parts; the number of times of rotary motion and the number of turns of the rotary motion start a valve driving mechanism, and reliability or service life tests are carried out.
f) After the test is finished, the tested valve matching parts are detached, the abrasion loss of the product is detected, and whether the product meets the design requirements of the product is measured.
The invention has the advantages that:
1. the valve driving device respectively drives the valve and the bushing through the linear driving device and the rotary driving device, so that independent linear motion and relative rotary motion of the valve can be realized, linear and rotary compound motion of the valve in the bushing can be simulated, and the real use environment can be effectively simulated.
2. The linear driving device and the rotary driving device can set different linear reciprocating motion amplitude values, different linear reciprocating motion frequency values and different rotary motion rotating speeds according to test requirements of different valves, set total operation times of a single test, reduce examination time of a service life test and improve test efficiency.
3. The heating and cooling of the fuel oil are realized by heating and refrigerating heat conducting oil and then exchanging heat between the heat conducting oil and the fuel oil. This avoids local carbon deposit caused by direct heating of the fuel. The heating process is realized in the oil bath, so that the fuel system equipment operates in a normal temperature environment, and the equipment cost is reduced.
4. The testing device has the characteristics of strong universality and wide application range. The device is suitable for valve matching parts of various specifications by replacing a special valve matching part tool (5-5), and other parts of the device can be used universally.
5. When the valve moves linearly, the joint bearing is arranged in the connection between the linear driving module and the valve, so that the valve caused by the coaxiality installation error between the driving rod and the valve is prevented from being subjected to extra radial force, and the tested piece is prevented from being tested.
Drawings
FIG. 1 is a working schematic diagram of a reliability and life test device for a hydraulic valve coupling part of the present invention
FIG. 2 schematic diagram of a fuel system
FIG. 3 is a schematic diagram of a heat transfer oil temperature control device
FIG. 4 shows a valve driving device and a special tooling diagram
Detailed Description
The invention discloses a reliability and service life test device for a hydraulic valve matching part, which comprises a power distribution system (1), a fuel system (2), a heat-conducting oil temperature control device (3), a remote test and equipment management system (4) and a valve driving device (5).
The power distribution system (1) is configured with corresponding power supply loops according to the electric power, voltage and the like of each subsystem.
The fuel system (2) is used for providing fuel with certain pressure, temperature and cleanliness, providing clean fuel with specified pressure and sufficient flow for a tested piece, and measuring and controlling the fuel pressure and the like; the oil supply pressure is 0 to 15MPa and can be adjusted at will.
The remote test and equipment management system (4) is used for controlling the start and stop of each piece of equipment of the test device and setting the operation of conditions.
The valve driving device (5) is used for driving the valve coupling part to simulate the actual use state to carry out reciprocating motion and rotary motion.
During specific design, each control plate can be adjusted according to actual requirements; the specific adjustment design is as follows: the heat-conducting oil temperature control device (3) is used for heating the working medium in the oil feeding bath; the heat conducting oil temperature control device is a set of independent heating loop, and is formed by combining an explosion-proof electric heater, a heat exchanger, a hot oil pump, an expansion tank (heat conducting oil flows into the container after being heated and expanded) and the like into a module to complete the circulating heating of the heat conducting oil. The oil return port of the heating device is provided with a cooler, and the heating oil can be rapidly cooled at a speed higher than 3 ℃/min under the working condition that the temperature needs to be reduced.
The heat conducting oil heating furnace is a novel, safe, high-efficiency, energy-saving, low-pressure (under normal pressure or lower pressure) special industrial furnace capable of providing high-temperature heat energy, and is a direct-flow special industrial furnace which takes electricity as a heat source and heat conducting oil as a heat carrier, uses a circulating oil pump to force liquid phase circulation, conveys the heat energy to heat utilization equipment, and then returns to reheating, and the steps are repeated in this way, so that the continuous heat transfer is realized, the temperature of a heated object is increased, and the technological requirement of heating is met.
The heat conducting oil belongs to organic silicon oil, does not produce harmful polymerization reaction, has no corrosivity to copper, stainless steel and the like, is a non-hazardous substance or a mixture, is colorless and tasteless, has a flash point of more than 135 ℃, and has a spontaneous combustion temperature of more than 400 ℃.
The remote test and equipment management system (4) is used for monitoring and controlling equipment, acquiring, displaying and storing parameters of a tested article, calling a required test mode program, automatically completing related tests and detection, and has the functions of test curve display and data processing. The system adopts EtherCAT real-time industrial Ethernet connection to form a distributed measurement and control network, a plurality of measurement and control sites are arranged nearby on site, an equipment management computer is used as an upper computer for equipment measurement and control and test management, is connected with each measurement and control site through a special network card, and is combined with data acquisition and control software to form a measurement and control system. The equipment management system is used for managing the whole running process of the tester, and comprises functions of test mode editing, equipment interlocking and control, alarm processing, data processing and the like, and the software running environment is a Windows operating system. The main functions are as follows:
a) the initial state of the equipment before the test is checked (according to the test mode) and displayed;
b) monitoring and recording the state parameters of the tester, wherein the parameter sampling period at least reaches 5ms, and the storage period is adjustable;
c) the system has the functions of automatic sequential starting, normal parking, emergency parking and the like;
d) the automatic alarm function is provided;
e) and the operation parameters are convenient to set.
The valve driving device (5) is mainly used for driving the valve in the service life test process of the valve matching part to realize the linear reciprocating motion, the rotary motion or the linear and rotary compound motion of the valve.
When the valve matching part is in service life, the valve and the bushing are combined together and are installed in a test tool (oil cavity), fuel oil of the test tool is provided by a hydraulic system, the pressure and the temperature of the fuel oil can be set according to requirements, and the pressure at two ends of the valve is the same.
a) The valve is driven to do linear reciprocating motion, and the reciprocating frequency of one-time continuous work is at least 100 ten thousand times;
b) the minimum stroke of the linear drive is 0.5mm, the maximum stroke is 100mm, and the position control precision is +/-0.2 mm;
c) a linear driving force of not less than 450N;
d) reciprocating frequency:
1) when the amplitude is +/-50 mm, the frequency is at least 1 Hz;
2) at an amplitude of + -2 mm of the reciprocating motion, the frequency is at least 35 Hz.
e) The valve stroke can be set;
f) the output rotation speed of the rotary driving device is not less than 7000 r/min.
A valve driving device (5) designed in the test device is shown in figure 4 and comprises a rotating motor (5-1), a flexible coupling (5-2), a finned heat exchange shell (5-3), a bush driving rod (5-4), a bush tool (5-5), a first high-temperature bearing (5-6), a locking nut (5-7), a second high-temperature bearing (5-8), a hole retainer ring (5-9), a connecting rod (5-10), a joint bearing (5-11), a valve driving rod (5-12), an end cover (5-13), a linear driving module (5-14), a dustproof ring (5-15), a pull rod seal (5-16), a first o-shaped ring (5-17), a pin shaft (5-18) and a valve (5-19), the oil bath device comprises a bushing (5-20), an oil bath groove (5-21), a second o-ring (5-22), a rotary pressure sealing ring (5-23), a baffle plate (5-24) and a mounting platform (5-25).
In the device, in order to ensure that high-temperature and high-pressure fuel oil does not leak, pull rod seals (5-16) are arranged in holes of the valve driving rod (5-12) and the end cover (5-13), and a rotary pressure sealing ring (5-23) and a baffle (5-24) are arranged at an interface of the lining driving rod (5-4). Meanwhile, in order to isolate fuel oil in the finned heat exchange shell (5-3) from heat conduction oil in the oil bath groove (5-21) and prevent oil channeling or heat conduction oil leakage, a first o-shaped ring (5-17), a dustproof ring (5-15) and a second o-shaped ring (5-22) are arranged at the flange of the interface. The locking nut (5-7) is used for fixing the bushing (5-20) and preventing the bushing (5-20) from moving in the bushing tool (5-5).
The heat exchange shell (5-3) with the fin plate is internally provided with a step for positioning a high-temperature bearing, and a retainer ring (5-9) for a hole is used for axially fixing the bearing.
The test device has the following advantages:
a) during high-temperature test, only fuel oil in the tool for installing the valve matching part, namely a small amount of fuel oil in the heat exchange shell (5-3) with the fin plate, needs to be heated. The heat conduction oil output by the heat conduction oil temperature control device is introduced into the oil bath groove (5-21), the heat conduction oil in the shell is heated to a target temperature (such as 150 ℃) through the heat conduction of the heat exchange shell (5-3), the heating speed is high because the fuel oil in the shell is small, compared with the whole fuel oil system, the heating time is short, the heating speed is high, the fuel oil system components such as a pump, a valve and an oil filter of the fuel oil system (2) only need to work in a normal temperature environment, and the explosion risk, the personnel safety risk and the equipment cost after the high-temperature fuel oil leaks are reduced.
b) In order to solve the problem that the test equipment can cause excessive force, the linear driving part is specially designed with a joint bearing (5-11) between the connecting rod (5-10) and the valve driving rod (5-12). The different axis error of the valve and the linear driving device absorbs the assembly tolerance through the tolerance of the joint bearing, and reduces the positive pressure (the component force is the test redundant force) of the valve on the inner wall of the bushing during the linear motion, thereby avoiding the over test of the valve matching part.
c) The work can be carried out by customizing the bushing tool (5-5) and keeping other structures unchanged, so that the valve matching parts with different diameters and strokes can be adapted to carry out reliability and service life tests.
d) The tool decouples the linear motion and the rotary motion of the valve matching part, and reduces the sealing requirement of a high-temperature medium. At the end cover (5-13) of the linear driving side, only the pull rod sealing needs to be considered, and at the rotary driving side, the finned heat exchange shell (5-3) is provided with a plurality of oil grooves at the driving rod hole and is provided with a rotary pressure sealing ring (5-23). After the sealing element is driven separately, the sealing element can be selected from shelf products, otherwise, the sealing element which meets the requirements of pressure, temperature and linear speed at the same time is difficult to find.
At the time of the particular test,
a) the oil pump group selects a high-pressure manual variable plunger pump and an explosion-proof motor which are special for RP-3 aviation fuel media; the oil suction port of the pump is provided with a filter to ensure the cleanliness of oil; the motor pump set is provided with a damping device, so that the safety and the reliability of the system are fully ensured;
b) a proportional overflow valve is arranged at the outlet of the pump and used as a safety valve protection pump, the safety pressure is continuously adjusted from 0-30 MPa, the power loss of the pump is avoided, and energy is saved; meanwhile, the electromagnetic overflow valve sets the maximum safe pressure of the system, and performs double protection on the system together with the proportional overflow valve, and the electromagnetic overflow valve ensures the unloading starting of the pump and plays a role in protecting the plunger pump. The pump outlet is provided with a measuring point and a pressure sensor, the measuring point can be connected with a pressure gauge to monitor the pressure of the pump outlet on site, and the pressure sensor can remotely transmit and monitor the pressure of the pump outlet at any time;
c) a pressure filter (5 mu) is arranged at the outlet of the pump to ensure the cleanliness of the oil output by the system;
d) the outlet of the pump is provided with a one-way valve and an energy accumulator; the check valve prevents the backflow of pressure oil when the pump is stopped; when the overflow valve is opened for unloading, the flow pressure of the energy accumulator changes, the energy accumulator can absorb impact, and simultaneously, the pump outlet absorbs pump pulsation;
e) the three-way direct-acting servo valve in front of the tested piece on the oil supply path is used for adjusting the pressure range required by the tested piece, and the front and the rear of the three-way direct-acting servo valve are provided with stop valves, so that the maintenance and the disassembly of the servo valve are facilitated; the three pressure regulating oil ways are used for supplying oil to three tested pieces of high pressure, medium pressure and low pressure;
f) the circulating oil way supplies oil to the tested piece in the oil bath;
g) a cooler on an overflow valve loop at the outlet of the pump is used for cooling the medium when the pump circulates through the proportional overflow valve;
h) an air filter is arranged on the oil tank and used for filling oil, and pressure balance inside and outside the oil tank and cleanness of fuel oil in the oil tank are guaranteed;
i) the oil supply and return filter is provided with a differential pressure transmitter, and when the oil filter is polluted and blocked and the differential pressure of an inlet and an outlet reaches 0.35MPa, an alarm display signal is sent out;
j) the bottom of the oil tank is provided with an oil discharge port and an oil discharge ball valve, and a plugging cover is arranged;
when the test piece works, part of leaked working medium in the test piece flows through the oil return pipeline, the cooler, the filter and the oil return box. Meanwhile, when the electromagnetic overflow valve at the outlet of the pump is in an unloading state, oil returns to the oil tank through the cooler and the filter, and the cooling oil way can be circularly flushed in the unloading state. The one-way valve on the oil return path ensures that the unloading oil returns to the oil tank.
Claims (7)
1. The utility model provides a hydraulic pressure valve idol piece reliability and life test device which characterized in that: the device comprises a power distribution system (1), a fuel system (2), a heat-conducting oil temperature control device (3), a remote test and equipment management system (4) and a valve driving device (5); the test piece is arranged in the valve driving device (5), the fuel oil system (2) is started to enable the periphery of the test piece to be filled with fuel oil, the test piece is heated to a target temperature through the heat conduction oil temperature control device (3), the remote test and equipment management system (4) sets test parameters, and the valve driving device (5) is controlled to carry out reliability and service life tests; the power distribution system (1) supplies power to the whole test device;
the valve driving device (5) comprises a rotating motor (5-1), a heat exchange shell (5-3) with a fin plate, a lining tool (5-5), a first high-temperature bearing (5-6), a second high-temperature bearing (5-8), a joint bearing (5-11), an end cover (5-13), a linear driving module (5-14), an oil bath groove (5-21) and an installation platform (5-25);
the oil bath groove (5-21) is of a hollow cuboid structure, an oil inlet and an oil outlet are formed in the side wall, a coaxial through hole is formed in the upper end and the lower end, and a flange is further arranged on the through hole; the heat exchange shell (5-3) with the fin plate is of a cylindrical structure;
the oil bath groove (5-21) is arranged on the mounting platform (5-25), the heat exchange shell (5-3) with the fin plate is arranged in the oil bath groove (5-21), and two ends of the heat exchange shell are fixed on the flanges; the valve (5-19) and the bushing (5-20) of the test piece are installed in a bushing tool (5-5), high-temperature bearings are respectively installed at two ends of the bushing tool (5-5) and integrally fixed in a finned plate heat exchange shell (5-3), and the rotating motor (5-1) is connected to the lower end of the bushing tool (5-5) through a bushing driving rod and drives the bushing tool (5-5) to rotate; the linear driving module (5-14) is connected to the valve (5-19) through a valve driving rod (5-12) and a joint bearing (5-11) and drives the valve to reciprocate; the upper end of the heat exchange shell (5-3) with the finned plate is sealed by an end cover (5-13), the lower end of the heat exchange shell is provided with a fuel oil inlet and a fuel oil outlet, and the heat exchange shell (5-3) with the finned plate is filled with fuel oil.
2. The hydraulic valve matching part reliability and service life test device according to claim 1, characterized in that: the heat-conducting oil temperature control device is an independent heating loop and is a functional module formed by combining an explosion-proof electric heater, a heat exchanger, a hot oil pump and an expansion tank, so that the heat-conducting oil is circularly heated.
3. The hydraulic valve matching part reliability and service life test device according to claim 1 or 2, characterized in that: the heat conduction oil temperature control device (3) circulates heat conduction oil, and the heat conduction oil belongs to organic silicon oil.
4. The hydraulic valve matching part reliability and service life test device according to claim 1, characterized in that: the inner wall of the cylinder of the finned heat exchange shell (5-3) is provided with a step for positioning the high-temperature bearing, and the inner wall of the cylinder is matched with a retainer ring (5-9) for a hole to axially fix the bearing.
5. The hydraulic valve matching part reliability and service life test device according to claim 1, characterized in that: and pull rod seals (5-16) are arranged in the valve driving rod (5-12) and the end cover (5-13) holes.
6. The hydraulic valve matching part reliability and service life test device according to claim 1, characterized in that: a rotary pressure sealing ring (5-23) and a baffle (5-24) are arranged at the interface of the lining driving rod (5-4).
7. The hydraulic valve matching part reliability and service life test device according to claim 1, characterized in that: and first o-shaped rings (5-17), dust-proof rings (5-15) and second o-shaped rings (5-22) are arranged at the flanges at the interfaces.
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| CN201911051116.7A CN110778572B (en) | 2019-10-30 | 2019-10-30 | Reliability and service life testing device for hydraulic valve matching parts |
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| CN111677723A (en) * | 2020-05-08 | 2020-09-18 | 中国北方车辆研究所 | Heat dissipation loop suitable for high-power movable closed hydraulic system |
| CN112412909A (en) * | 2020-10-30 | 2021-02-26 | 中国航发西安动力控制科技有限公司 | High-temperature and high-pressure resistant simulation load module |
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| CN101231215B (en) * | 2008-02-28 | 2010-04-21 | 北京航空航天大学 | Device and method for testing upper air performance of aircraft engine fuel oil system |
| CN202372342U (en) * | 2011-12-14 | 2012-08-08 | 中国科学院沈阳计算技术研究所有限公司 | Valve performance test system |
| CN202393590U (en) * | 2012-01-09 | 2012-08-22 | 中国人民解放军海军航空工程学院青岛分院 | Aviation fuel accessory integrated test system |
| CN102954872B (en) * | 2012-10-12 | 2016-01-13 | 湖北航达科技有限公司 | Hydraulic air element high temp oil-fired testing table |
| CN103699114A (en) * | 2013-12-13 | 2014-04-02 | 中国燃气涡轮研究院 | Controller and control method for debugging tests of aviation fuel regulating device |
| CN104316309B (en) * | 2014-11-11 | 2017-07-18 | 四川亚美动力技术有限公司 | A kind of lower-grade fuel integrated test facility |
| CN105041478B (en) * | 2015-08-25 | 2017-08-11 | 中国航空工业集团公司西安飞机设计研究所 | A kind of fuel oil heater |
| CN106153318B (en) * | 2016-06-28 | 2018-08-24 | 西安航空动力控制科技有限公司 | Precise bushing valve couple performance test measuring device |
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