KR19990079715A - Load simulator for bearing test - Google Patents

Abstract

Set the pressure of the relief valve 74 with the proportional control valve 76 closed and operate the motor 66 at a constant speed to cause the oil pump 64 to discharge oil in the oil tank 52. Next, the pressure of the oil supplied to the load applying member 92 can be adjusted by setting the desired pressure by remotely adjusting the proportional control valve 76.

Description

Load simulator for bearing test

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load simulator, and more particularly, to a load simulator for a load test, which is constructed to simulate the axial load or the lateral load applied to a test bearing during a bearing test.

A gas turbine engine is a rotary internal combustion engine which obtains rotational force by rotating a turbine while expanding a combustion gas of high temperature and high pressure, and many engine bearings are used for a gas turbine engine. Since gas turbine engines can obtain large horsepower compared to reciprocating internal combustion engines or steam turbines, it is necessary to check the bearing characteristics according to the change of the axial load and lateral load acting on the engine bearings at the maximum engine rotational speed. It is important to carry out the test. Load simulators are used to test engine bearings, which are used to simulate the lateral and axial loads acting on the bearings.

1, there is shown a plan view showing the structure of a load simulator for bearing testing according to the prior art. The load simulator 10 includes an electromagnet 24 and a screw jack 26. The pair of bearings 18, 20 are provided in an isolated manner from each other on the outer circumferential surface of the shaft 12, the shaft 12 being connected to the motor output shaft 14 via the coupling 16. When the motor output shaft 14 is rotated, the shaft 12 can also be rotated integrally.

The first bearing 18 is supported by the bearing housing 22, and the bearing housing 22 takes the shape of a 'c' shape which is generally rotated 180 degrees as shown. One end of the spring 32 is connected to the base portion of the bearing housing 22, and the other end of the spring 32 is connected to the load applying member 30. Block 40 is in contact with the surface of the load application member 30 opposite from the spring 32, the block 40 is screwed to the jack rod 28 of the screw jack 26. The motor 38 is disposed at a point close to the screw jack 26, the first belt pulley 34 is fixed to the shaft of the motor 38, and the second belt pulley 35 is attached to the screw jack 26. Is provided. The belt 36 is wound around the outer surfaces of the first belt pulley 34 and the second belt pulley 35. When the motor 38 is driven, the rotational force of the shaft of the motor 38 is transmitted to the screw jack 26 via the belt 36, and the load applying member 30 is lifted while the length of the jack rod 28 is changed. It is pushed against the bearing housing 22 to apply axial load to the first bearing 18. An electromagnet 24 is provided on an outer circumferential surface of the second bearing 20, and the second bearing 20 is supported by the electromagnet 24 and is subjected to a lateral load as power is applied to the electromagnet 24.

However, the load simulator for bearing test according to the prior art structured as described above is complicated in structure and expensive. The design becomes difficult because the mechanical, structural and electrical factors must be taken into account in the design. Moreover, since it occupies a relatively large space, it cannot use in a narrow place.

The present invention was created to solve the problems inherent in the load simulator for bearing test according to the prior art as described above, the object of the present invention is to simplify the structure to reduce the price and to be effectively used even if the installation space is narrow The present invention provides a load simulator for bearing testing.

1 is a plan view showing the structure of a load simulator for bearing test according to the prior art.

2 is a hydraulic system diagram showing a structure of a load simulator for bearing test according to the present invention.

Explanation of symbols on the main parts of the drawings

10: load simulator 12: shaft

14: output shaft 16: coupling

18: first bearing 20: second bearing

22: bearing housing 24: electromagnet

26: screw jack 28: jack rod

30: load applying member 32: spring

34: First Belt Pulley 35: Second Belt Pulley

36: belt 38: motor

40: block 50: load simulator

52: oil tank 54: pressure gauge

56: temperature sensor 58: level detector

60: strainer 62: fan cooler

64: oil pump 66: motor

68: oil filter 70: check valve

72: accumulator 74: relief valve

76: proportional control valve 78: amplifier

80: potentiometer 82: pressure transducer

84: water gauge 86: solenoid valve

88: hydraulic supply line 90: hydraulic return line

92: load applying member 94,95: branch line

96: fork

According to one aspect of the invention, there is provided a load simulator for bearing testing, the simulator comprising: an oil tank; An oil pump for pumping oil in the oil tank; And a proportional control valve for controlling the amount of oil flowing toward the test bearing to apply the lateral load or the axial load to the test bearing.

According to another aspect of the invention, the simulator, a potentiometer for adjusting the opening and closing of the proportional control valve; And an amplifier disposed between the proportional control valve and the potentiometer.

According to another aspect of the present invention, the solenoid valve is further provided for removing a load applied to the test bearing when an abnormality occurs in the test bearing.

According to another aspect of the present invention, the simulator comprises: an accumulator for reducing shock and pulsation of oil discharged from the oil pump; Relief valve; And a pressure gauge.

According to another aspect of the invention, the simulator further comprises a pressure transducer for monitoring the load and recording the data.

According to another aspect of the invention, the simulator, the temperature sensor for measuring the temperature of the oil in the oil tank; A level detector for stopping the operation of the oil pump when the height of the oil in the oil tank falls below a certain level; A fan cooler for cooling the oil returned to the oil tank; A strainer for filtering oil pumped from the oil tank towards the oil pump; And an oil filter for filtering the oil discharged from the oil pump.

According to the above characteristics of the present invention, it is possible to control the load value applied to the test bearing by adjusting the opening degree of the proportional control valve, so that the load simulator according to the prior art mechanically, structurally and electrically complex has a simple structure. It is possible to replace it with a hydraulic system. Therefore, it is possible to construct a load simulator at a low price, and the load simulator can be effectively used even when the installation space is small.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention, the same reference numerals will be used for the same parts throughout the drawings.

2 shows a hydraulic system diagram showing the structure of a load simulator according to the present invention.

The load simulator 50 according to the present invention includes an oil tank 52, and the oil tank 52 is filled with a predetermined amount of oil. The oil tank 52 is connected to an appropriate load applying member 92 via a pair of hydraulic supply lines 88. The load application member 92 is arranged in such a way that it can apply axial loads and / or lateral loads to the bearings. Since the hydraulic supply arrangements arranged in each hydraulic supply line 88 take the same structure with each other, in the following description, only the arrangements provided in one hydraulic supply line 88 will be described in detail.

In the vicinity of the oil tank 52, an oil pump 64 is disposed in the hydraulic supply line 88, and the oil pump 64 is connected to the motor 66. When the motor 66 is operated, the oil pump 64 pumps oil from the oil tank 52 and discharges it toward the load applying member 92. When viewed in the flow direction of oil along the hydraulic supply line 88, a check valve 70 is provided in front of the oil pump 64, the check valve 70 is the oil discharged from the oil pump 64 To prevent backflow towards the oil pump 64. An oil filter 68 is positioned in front of the check valve 70, and the oil filter 68 filters impurities contained in the oil discharged from the oil pump 64.

A proportional control valve 76 is provided on the hydraulic supply line 88 in front of the oil filter 68, which is connected to a potentiometer 80 via an amplifier 78. By operating the potentiometer 80 remotely, the changed resistance value is amplified by the amplifier 78 and transferred to the proportional control valve 76 to adjust the opening and closing degree of the proportional control valve 76. By opening and closing the proportional control valve 76, the passage cross-sectional area through which oil can flow is adjusted, so that the outlet pressure of the oil pump 64 can be adjusted proportionally. Therefore, by adjusting the opening and closing degree of the proportional control valve 76, the pressure of the oil supplied to the load applying member 92 can be adjusted. A pressure transducer 82 is disposed in front of the proportional control valve 76. The pressure transducer 82 converts the pressure of the oil supplied to the load applying member 92 into a load value to monitor the load. Record the data.

One end of the hydraulic return line 90 is connected to the proportional control valve 76, and the other end of the hydraulic return line 90 is connected to the oil tank 52. By adjusting the proportional control valve 76 to close the hydraulic supply line 88 and open the hydraulic return line 90, the oil supplied to the load applying member is supplied to the oil tank 52 along the hydraulic return line 90. Can be returned to. A solenoid valve 86 is arranged between the pressure transducer 82 and the load applying member 92, and the solenoid valve 86 receives a signal when an abnormal phenomenon occurs from the bearing under test and the controller (not shown). The alarm is issued and the oil is returned to the oil tank 52 along the hydraulic return line 90 by removing the load applied to the bearing. A fan cooler 62 is provided on the hydraulic return line 90 at a point close to the oil tank 52, and the fan cooler 62 cools the oil returned toward the oil tank 52.

Two branching lines 94 and 95 are formed in the hydraulic supply line 88 between the proportional control valve 76 and the oil filter 68. An accumulator 72 is provided at the end of the first branch line 94, and a pressure gauge 54 is provided between the accumulator 72 and the branch point 96. The accumulator 72 reduces shock and pulsation of the oil discharged from the oil pump 64, and the pressure gauge 54 displays the pressure of the oil flowing through the hydraulic supply line 88. One end of the second branch line 95 is connected to the hydraulic supply line 88 at the branch point 96, and the other end is connected to the hydraulic return line 90. A relief valve 74 is disposed in the second branch line 95, and the relief valve 74 opens when the pressure of the oil flowing toward the proportional control valve 76 exceeds a predetermined value, thereby hydraulic returning the oil. Return to oil tank 52 via line 90.

A level detector 58 is installed in the oil tank 52, and the level detector 58 detects when the height of the oil falls below a predetermined level to stop the operation of the oil pump 64. A strainer 60 is provided at one end of the hydraulic supply line 88 connected to the oil tank 52, and the strainer 60 is pumped from the oil tank 52 toward the oil pump 64. Filter the oil. Reference numeral 56 denotes a temperature sensor for measuring the temperature of oil in the oil tank 52, and reference numeral 84 denotes a water gauge.

Therefore, the pressure of the relief valve 74 is set in a state where the proportional control valve 76 is closed and the motor 66 is operated at a constant speed to cause the oil pump 64 to discharge oil in the oil tank 52. Then, by adjusting the proportional control valve 76 remotely to set the desired pressure it is possible to adjust the pressure of the oil supplied to the load applying member 92.

According to the configuration as described above of the present invention, it is possible to control the load value applied to the test bearing by adjusting the opening degree of the proportional control valve, thereby simplifying the load simulator according to the prior art mechanically, structurally and electrically complicated. It is possible to replace it with a hydraulic system of structure. Therefore, it is possible to construct a load simulator at a low price, and the load simulator can be effectively used even when the installation space is small.

While the present invention has been illustrated and described with reference to certain preferred embodiments, the invention is not limited thereto but may vary without departing from the spirit or scope of the invention as set forth in the claims below. It will be readily apparent to those skilled in the art that such modifications and variations can be made in the art.

Claims (6)

In the load simulator for bearing test, Oil tank; An oil pump for pumping oil in the oil tank; And And a proportional control valve for controlling the amount of oil flowing toward the test bearing to apply lateral load or axial load to the test bearing. The method of claim 1, A potentiometer for controlling the opening and closing of the proportional control valve; And an amplifier disposed between the proportional control valve and the potentiometer. The method of claim 1, Load simulator for bearing test, characterized in that it further comprises a solenoid valve for removing the load applied to the test bearing when abnormality occurs in the test bearing. The method of claim 1, An accumulator for reducing shock and pulsation of oil discharged from the oil pump; Relief valve; And a pressure gauge for bearing test. The method of claim 1, Load simulator for bearing testing, further comprising a pressure transducer for monitoring the load and recording data. The method of claim 1, A temperature sensor for measuring the temperature of oil in the oil tank; A level detector for stopping the operation of the oil pump when the height of the oil in the oil tank falls below a certain level; A fan cooler for cooling the oil returned to the oil tank; A strainer for filtering oil pumped from the oil tank towards the oil pump; And an oil filter for filtering the oil discharged from the oil pump.