SU1368493A1 - Method of adjusting operation of hydraulic machine according to condition of contact seal and device for effecting same - Google Patents

Abstract

The invention improves cost-effectiveness by more accurately monitoring leakage through the seal. As a diagnostic parameter, the difference t rp of the liquid in the inlet and outlet is used. From the seal, and before switching off the hydraulic machine, they are held in time. The difference in t-ry shdokty at the entrance and exit of the seals, determined in block 9 of the comparison, does not depend on t-ry itself

Description

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fluid and determined by the degree of tightening and wear of the gland 1. The permissible range of difference tp is taken into account by setting the threshold device 10 to the appropriate boundary values of the difference tp, In case of a deviation beyond the allowable limits, the threshold device 10 gives a signal

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FIELD OF THE INVENTION The invention relates to hydraulic machine building, namely to methods and devices for monitoring the state of contact seals,

The purpose of the invention is to increase efficiency by more accurately controlling leakage through the seal.

The drawing schematically shows a device for controlling the operation of a hydraulic machine according to the state of contact sealing.

The device comprises a gland 1, a pressure cover 2, a temperature sensor 3 with an amplifier 4, test equipment 5 and a tripping device 6 and is equipped with an additional temperature sensor 7 with an amplifier 8, a comparison unit 9, a threshold device 10 with two outputs and a delay unit 11, the temperature sensor 3 is installed in the pressure switch 2, the additional temperature sensor 7 is located in front of the gland 1 on the side opposite to the pressure pressure 2, the amplifiers 4 and 8 are connected through block 9 compared with the threshold device TO, the first output terminal orrgo connected to .kontrolno- measuring apparatus 5, and the second unit 11 via the delay - with the trip device 6. The control equipment 5 may comprise detectors 12 and 13 of the limit condition and LED 14 of the actual state of the seal.

The method of regulating the operation of the hydraulic machine according to the state of the contact seal includes determining the allowable range of the variation of the diagnostic parameter, measuring the actual value of the latter, comparing it with the values from the tolerance

the delay unit 11 and the alarms 12, 13. The block 11 conducts a delay in time, which eliminates the activation of the shut-down device 6 during short-term fluctuations of the hydraulic oil characteristics and allows for the necessary adjustment of the seal without disabling the hydraulic machine. 2 sec. f-ly, 1 ill.

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when the actual value of the diagnostic parameter deviates beyond the permissible range. As a diagnostic parameter, the difference in the temperature of the fluid at the inlet and outlet of the seal is used, and before shutting off the hydraulic machine, the time delay is taken.

The method is implemented in a device for controlling the operation of the hydraulic machine according to the state of the contact seal as follows.

The functional dependence of the temperature difference (between the liquid and the gasket 2 seal) on the degree of tightening of the gland 1 is determined on the basis of preliminary scientific research or during commissioning tests of the hydraulic machine, while ensuring the leakage rate during testing is determined by the technical conditions for the hydraulic machine . Subsequently, during operation, the technical condition of the compaction of the hydraulic machine is determined by recording the temperatures measured by sensors 3 and 7, which are output through amplifier 4.8 and block 9

Comparison of instrumentation equipment 5 ..

The difference in fluid temperature at the inlet and outlet of the seals, determined in comparison unit 9, does not depend on the temperature of the fluid itself and is determined by the degree of tightening and wear of the stuffing box 1.

The permissible range of temperature differences is taken into account by adjusting the switch device 10 to the corresponding boundary values of the temperature difference.

The location of the temperature sensor 3 in the pressure cap 2, which has a large area of contact with the fluid flowing through the seal, makes it possible to more accurately determine the temperature of the fluid leaving the seal

Claims (2)

1. The method of adjusting the operation of a hypoelectric shedding according to the state of a contact seal, including determining the permissible range of change of the diagnostic parameter, measuring the actual value of the latter, comparing it with the values from the permissible range and turning off the hydraulic machine when the actual value of the diagnostic parameter is off beyond the limits of the permissible spade so that, in order to improve efficiency by more accurately controlling leakage through the seal, the differential temperature of the fluid entering and leaving the seal is used as a diagnostic parameter, and before shutting down the hydraulic machine produced in time. 2. A device for regulating the operation of a hydraulic machine to sbad contact seal, containing a gland, push button, temperature sensor with an amplifier, monitoring and measuring equipment and a disconnecting device, characterized in that, in order to increase efficiency by more precise control leakage through the seal, the device is equipped with an additional temperature sensor with an amplifier, a comparison unit, a threshold device with two outputs and a delay unit, the temperature sensor is installed in the pressure switch, the additional temperature sensor is in front of the gland on the side opposite to the pressure switch, the amplifiers are connected through the comparison unit with the threshold device, the first output of which is connected to the instrumentation and the second through the delay unit to the disconnecting device.