KR20170040478A - Apparatus for life evaluation test of pump mechanical seal and its method - Google Patents

Abstract

The present invention relates to a pump mechanical seal life test apparatus for simulating the performance deterioration of a mechanical seal, which is an apparatus for sealing a fluid circulating in a pump used in an industrial facility such as a power plant or a chemical plant .
In order to simulate various abrasion and leakage conditions, which are the degradation of the mechanical seal performance due to fluid pressure, fluid temperature, and shaft rotation speed, which are important parameters for the mechanical seal performance of the pump, the present invention implements the physical seal of the pump mechanical seal A fluid circulation module for providing a test observation module with a fluid pressure and a fluid temperature change; and a fluid circulation module A data acquisition & control module for collecting data measured by various sensors, for controlling the operation of the test device, and an electric power control module ), The data measured by various sensors in the test observation module and the fluid circulation module are analyzed, Data analysis and display module (data analysis & display module) includes a computer.

Description

Technical Field [0001] The present invention relates to a pump mechanical seal life evaluation test apparatus and a pump mechanical seal life evaluation test apparatus,

The present invention evaluates the current service life of a mechanical seal by simulating the performance degradation of a mechanical seal which is a core device for sealing a fluid circulating in a pump used in industrial facilities such as power plants and chemical plants, And more particularly, to a pump mechanical seal life evaluation test apparatus for accurately predicting a pump mechanical seal life

In general, a large number of pumps are used in industrial facilities such as power plants and chemical plants. Mechanical seals, which are one of the important devices constituting such pumps, are contact sealing devices, and are equipped with two sliding surfaces perpendicular to the pump rotating shaft (Stator, rotor), one side rotates together with the rotating shaft, and is a key device of the pump which continuously keeps the rotation of the rotating part by the tension of the spring or the pressure of the fluid. The mechanical seal is absolutely necessary to prevent the leakage of the rotating shaft Device.

In addition, the mechanical seal is used as a sealing device for the rotating shaft of the pump, and most of the causes of use of the pump occur in the mechanical seal which is a sealing device.

Frequent failures caused by the performance deterioration of mechanical seals are caused not only by the replacement cost of expensive mechanical seals but also by time, device disassembly, parts replacement, power loss, and enormous economic loss. In particular, the failure of pump mechanical seals used in safety aspects, such as nuclear power plants, will cause serious damage and accidents such as loss of cooling function, emission of toxic substances and radioactive materials. In addition, due to the trend of high speed and high pressure of pump rotating machine, there is a lot of demand in the industrial field for the appearance of highly reliable mechanical seals. In one factory, various mechanical seals are used, and repair maintenance and inventory management are operated in combination Therefore, it is essential to systematize conservation work through life prediction. In order to accurately predict the service life of such a mechanical seal, a technique and an apparatus capable of accurately evaluating the performance degradation of the mechanical seal are required. However, until now, there is no technology or device to monitor and grasp the condition of mechanical seal, so most of them are periodically replaced or replaced when an accident occurs. Therefore, the replacement periodically, regardless of the condition, causes wasted factors by replacing mechanical seals having a residual life of 90% or more. In addition, the replacement of mechanical seals in case of an accident causes a loss of economic and safety It is necessary to prepare an improvement measure to solve this problem.

Korean Patent No. 10-2012-0033599, which is a prior art 1, relates to an apparatus and method for measuring the thickness of a pump mechanical seal defect, and Korean Patent Laid-Open No. 10-2007-0109788 of Prior Art No. 2 relates to a mechanical seal , And the technical structure and effect of the "pump mechanical seal life evaluation test apparatus" which is the core content of the present invention are different.

The present invention relates to a method and an apparatus for evaluating the present service life of a mechanical seal and accurately estimating a performance degradation of a mechanical seal in order to accurately predict future service life, A variety of abrasion and leakage conditions, such as fluid pressure, fluid temperature, and pump shaft rotation speed, are simulated with test specimens to set criteria for acoustic signals, displacement sensors, and load cell signals according to performance degradation conditions. And to provide a pump mechanical seal life evaluation test apparatus.

Another problem to be solved by the present invention is to evaluate the residual life of the mechanical seal by inputting the performance parameters of the pump in use into the simulation module and simulating the mechanical seal until the time when the mechanical seal is in use, Provides a life evaluation tool for the pump mechanical seal that can evaluate the current performance degradation state and service life from the acoustic measurement results of the pump mechanical seal operating on the site by securing the service life data according to the performance variable of the mechanical seal required. .

In order to accomplish the above object, the present invention provides an actual pump for simulating a variety of abrasion and leakage states, which is a phenomenon of degradation of mechanical seal performance due to changes in fluid pressure, fluid temperature, and shaft rotational speed, A test module for simulating the mounting location of the mechanical seal, a fluid circulation module for providing fluid pressure and fluid temperature changes to the test and observation module, A data acquisition and control module for collecting data measured by various sensors in the test observing unit and the fluid circulation module and for controlling the operation of the testing apparatus, An electric power control module, and a plurality of sensors, The analyzes include the data analysis and display module (data analysis & display module) to display.

The test observation module is a device for artificially simulating a performance degradation of a mechanical seal test specimen and can be constituted by a servomotor, a drive, a bearing, and a housing for providing a rotational force of the rotational shaft.

The test observation module is provided with a servomotor and a driver to provide a contact pressure for applying a mutual force between the stationary ring and the rotary ring due to the fluid pressure acting on the mechanical seal and an average sliding speed of the rotary ring at the contact surface .

It is preferable that the test observation module includes a ball bearing for supporting the radial direction of the axis received by the shaft during the rotation of the shaft and a thrust bearing for supporting the load applied in the axial direction.

The housing having a recirculation structure can be constructed so that the fluid that has escaped from the pump discharge side to the test observation module is supplied to the mechanical seal portion to cool the heat generated at the contact portion and then enter the pump again.

The fluid circulation module may comprise a piston pump, a flow control valve, an accumulator, a relief valve, a directional control valve, a heater, a cooler, a storage tank, and the like.

The fluid circulation module is required to select a pump that does not cause a change in flow rate and pressure in the system due to a load fluctuation. Therefore, it is possible to obtain a high pressure by minimizing the discharge amount, It is preferable to include a piston pump which is a positive displacement reciprocating pump.

The fluid circulation module may include a flow control valve for controlling a flow rate of the test fluid supplied to the test observation module.

And an accumulator for preventing the circulation loop and the device from being damaged when the pressure of the fluid supplied from the pump to the fluid circulation module is unstable or excessive pressure is generated.

And a relief valve for preventing the pump from being damaged when a pressure exceeding the maximum permissible pressure of the pump is applied to the fluid circulation module.

And a direction switching valve for opening the valve when excess pressure rises to the fluid circulation module so that the pressure of the pump discharge line can be sent to the return line.

The fluid circulation module may include a heater, a cooler, and a storage tank for controlling and storing the temperature of the fluid.

A torque and force sensor, a circulating water pressure sensor, a circulating water temperature sensor and a fixed ring temperature measuring sensor, an acoustic sensor and a torque sensor can be constituted for the data acquisition and control module for data acquisition and control from the test observation module. In addition, the fluid circulation module can constitute a pressure sensor and an analog pressure gauge, a temperature sensor, a flow sensor, and a load cell. In the test observation module connected to the data acquisition and control module, fluid pressure (P) It is desirable to include a torque and force sensor to observe a change in force component of the rotating ring on the stationary ring in the event of contact surface wear over time under fluid temperature (T) and pump shaft rotational speed (V) conditions.

A pressure condition setting for measuring the pressure of the circulating water supplied to the test observation module chamber to the test observation module connected to the data acquisition and control module and a leakage condition using the pressure signal when the leakage occurs due to the sealing contact surface with time It is preferable to include a circulating water pressure sensor to check whether or not the pressure sensor can detect the circulating water pressure sensor.

A circulation water temperature sensor is installed in the test observation module connected to the data acquisition and control module to measure the temperature of the circulating water supplied into the chamber and set a temperature condition, It is preferable to include a fixed ring temperature measuring sensor to check whether the change of the contact wear amount of the fixed ring through the observation of the temperature change of the fixed ring is detected.

It is preferable to configure the acoustic sensor to detect the leakage and increase in leakage by observing the contact wear at the sealing portion of the rotating ring and the stationary ring and the change of the elastic wave generated at the occurrence of leakage in the test observation module connected to the data acquisition and control module Do.

It is preferable to include a torque sensor for measuring the amount of rotation torque transmitted from the drive servo motor to the test observation module to the test observation module connected to the data acquisition and control module and to observe a change in the friction load received by the test observation module Do.

A fluid circulation module connected to the data acquisition and control module,

For confirmation, it is desirable to construct a pressure sensor and analog pressure gauge at the piston pump discharge side, accumulator piping line, relief valve shear, relief valve shear, relief valve rear position.

It is preferable to attach a temperature sensor to the accumulator pipe line in order to provide an input value for controlling the start and stop operations by feeding back the measured values to the fluid circulation module connected to the data acquisition and control module in real time by the heater and the cooler .

And a flow rate sensor for measuring a flow rate supplied to the test observation module to the fluid circulation module connected to the data acquisition and control module.

And a load cell for measuring an amount of leakage due to wear on the contact surface of the mechanical seal to the fluid circulation module connected to the data acquisition and control module.

A data analysis board of the flow rate and level transmitter measurement channel, a data analysis board of the force, torque, pressure and load cell measurement channels, data of the sound signal measurement channel You can configure data analysis boards and display computers such as analysis board, motion board for servo motor control, board for temperature measurement and relay board.

It is desirable to construct a data analysis board of flow and level transmitter measurement channels to analyze the analog and digital signals of the flow and level transmitter to the data acquisition and control module.

It is desirable to construct a data analysis board of force, torque, pressure and load cell measurement channels to analyze force, torque, pressure and analog and digital signals of the load cell to the data acquisition and control module.

It is preferable to construct a data analysis board of the acoustic signal measurement channel in order to analyze the data measured by the acoustic sensor to the data acquisition and control module.

It is preferable to constitute a motion board for servo motor control in order to separately control the servo motors mounted on the driving section of the test observation module rotation axis to the data acquisition and control module.

It is preferable to configure a temperature measurement board to measure the fixed ring temperature and the circulating water temperature in the data acquisition and control module.

It is preferable to configure the relay board to control the operation of the heater operation control relay to the data acquisition and control module.

It is preferable to construct a panel for supplying and controlling the electric power of the test apparatus to the electric control module.

A display screen showing various operation and performance data, a screen for displaying sound measurement results, and a display screen for displaying test data, which are displayed on the data analysis and display module, It is preferable to construct a screen for storing the data.

The screen showing the operation state of the entire simulated test apparatus in the data analysis and display module includes a fluid circulation module status display unit indicating the status of the circulation water temperature and pressure of the fluid circulation module, the rotational axis speed of the test observation module, Torque display and power status of the pump module, a leakage display unit for indicating the amount of leakage due to abrasion at the contact surface of the mechanical seal in the test observation module, pump start / stop, pump rotational axis speed, circulating water temperature and leakage amount control method Setting and control status display It is desirable to configure the operation condition control and display unit for controlling and displaying the simulated test equipment operation status.

The display screen showing various operation and performance data in the data analysis and display module includes a test observation module status display unit indicating a status of a rotation axis speed, a circulation water temperature and pressure, a torque and a force of a unit test observation unit to be measured, A temperature and pressure analyzing unit that displays the temperature and pressure according to the measurement time in the unit test observation module, and a temperature and pressure analyzing unit that measures the rotation time of the motor rotation axis supplying the rotation force to the unit test observation module A torque and force analyzing section showing the torque of the motor rotation shaft torque analyzing section, the torsion and compression of the stationary ring according to the measurement time in the unit test observation module, and the temperature of the stationary ring according to the measurement time in the unit test observation module Temperature analysis part of stationary ring, measurement time in unit test observation module And a circulating water leakage amount analyzing unit.

The screen for displaying acoustic measurement results on the data analyzing and display module detects seismic signals generated by contact wear and leakage generated at the sealed portion between the rotating ring and the fixed ring to detect seepage signals according to leakage and leakage amount, The average voltage (RMS) change of the acoustic signal with respect to the leakage amount according to the measurement time is evaluated and the amplitude change of the acoustic signal with respect to the leakage amount according to the measurement time is evaluated It is preferable to configure the sound signal amplitude analyzing section.

The screen for storing the test data in the data analysis and display module includes a data storage folder and a data storage file name designation, a data storage cycle setting in seconds, a minute file creation cycle setting for a new file, a sound data storage folder and data It is preferable to store various test data such as a storage file name designation.

According to the mechanical seal life evaluation test apparatus according to the present invention, the conditions of various monitoring parameters such as the pressure and temperature of the cooling fluid supplied to the mechanical seal and the rotational speed of the shaft are input to the simulated test apparatus and artificially changed, And the variation of the signal characteristics of the monitoring variables. Finally, simulation and testing of various wear and leakage conditions, which are the phenomena of mechanical seal performance deterioration caused by the performance parameters of the mechanical seal, And to provide a pump mechanical seal life evaluation test apparatus capable of setting a reference of a sensor and a load cell signal.

In addition, since it is possible to test the model simulator by reflecting the conditions of the site, it is possible to improve the accuracy of the data in predicting the remaining life of the mechanical seal operating in the field.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a basic configuration showing a performance deterioration position of a pump mechanical seal. Fig.
2 is a schematic view showing an apparatus for evaluating the life of a pump mechanical seal according to the present invention.
3 is an external view of the test observation part of the pump mechanical seal life evaluation test apparatus.
4 is a structural view of the test chamber of the test observation section.
5 is an arrangement view of the test chamber sensor of the test observation section.
6 is a block diagram of the fluid circulation module of the pump mechanical seal life evaluation test apparatus.
7 is a principle diagram of leakage weight measurement of the fluid circulation module.
8 is a block diagram of the data acquisition and control module.
9 is a screen showing the operation state of the entire simulator in the data analysis and display module.
10 is a display screen showing various operation and performance data in the data analysis and display module.
11 is a screen for displaying the result of sound analysis of the data analysis and display module.
12 is a data storage screen of the data analysis and display module.
FIG. 13 shows a simulation test apparatus operation condition control and display unit on the screen showing the operation state of the entire simulation test apparatus in the data analysis and display module.

Hereinafter, the present invention will be described in detail.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a basic configuration showing a performance deterioration position of a pump mechanical seal. Fig. As shown in Fig. 1, the pump mechanical seal is a surface-contact type sealing device, and has a seal face composed of two fixed rings 50 and 30 perpendicular to a shaft 10, (40), one surface of which rotates together with the rotating shaft (10) and which seals the rotating portion by the tension of the spring (20) or the pressure of the fluid. The pump mechanical seal is an absolutely necessary device for preventing the leakage of the rotating shaft 10 and the lubrication of the seal face 40 is made by the fluid film formed by itself and corresponds to the position where the performance deterioration occurs. The deterioration of the performance of the mechanical seal means occurrence of leakage of fluid due to the occurrence of abrasion of the interference surface 40 and the failure of the seal due to abrasion.

2 is a schematic view showing an apparatus for evaluating the life of a pump mechanical seal according to the present invention. 2, the apparatus for evaluating the life of a pump mechanical seal according to the present invention includes a test observation module 100, a fluid circulation module 300, a data acquisition and control module 500, an electric control module 700, And a data analysis and display module 900.

The test observation module 100 simulates the mechanical seal performance deterioration at the mounting portion of the actual pump mechanical seal and changes the acoustic signal due to the wear and leakage of the seal, the fixed ring temperature change corresponding to the operation condition inside the test observing portion, It is a device for directly measuring and observing the performance degradation of mechanical seal by various sensors such as torque change, seal wear amount and leakage amount. The test and observation module 100 can be configured to test an artificial simulation specimen and to test performance degradation due to long-term operation. Here, the test observation module 100 is driven and controlled by a high-speed servomotor and a drive, and is equipped with various signal measurement sensors.

3 and 4 are views for explaining the test observation module 100 in detail. 3 is a configuration diagram showing an external configuration of a test observation module including a driving device and includes a servomotor 110 for driver control, a coupling 120, 140, a torque sensor 130, (150).

The pressure of the fluid acting on the mechanical seal on the test and observation module 100 provides the contact pressure that the stationary ring 50 and the rotary ring 30 apply force to each other at their contact surfaces, A servo motor 110 that can be controlled by a driver is installed to make an average sliding speed.

The torque sensor 130 is connected to the same axis as the servo motor 110 to measure the amount of torque transmitted to the test chamber from the drive servomotor 110 to the test observation module 100, 120, and finally, the torque sensor shaft and the rotation shaft of the test chamber 50 are finally connected and the coupling 140 is installed in the middle.

FIG. 4 is a view showing the internal configuration of the test chamber of the test observation module 100, which includes a thrust bearing 152 for supporting an axially loaded load, a ball bearing (not shown) for supporting a radial direction 153 and 154. The fluid discharge pipe 155 and the fluid supply pipe 161 are connected to the fluid discharge pipe 155 so that the fluid discharged from the pump discharge side is supplied to the mechanical seal portion to cool the heat generated at the contact portion, A rotary shaft 156 connected to the shaft of the servo motor 110, a rotary ring 157 serving as a fluid sealing device and a stationary ring 160, a protection ring A bushing 164, a leak-proof seal 166, a retaining ring support 168 for supporting the retaining ring, a torque and force sensor (not shown) for measuring the torque and thrust of the internal rotation axis of the test chamber torque & thrust se nsor 170, and a leakage fluid discharge pipe 172 as a passage through which fluid leaking due to seal leakage is discharged.

5 is a sensor mounting arrangement mounted on the test observing section. In order to acquire data of the test observation module, a circulating water temperature sensor 151, a circulating water pressure sensor 158, a non-contact optical displacement sensor 163, A sensor 170, an acoustic sensor 171, and a fixed ring temperature measurement sensor 175.

The circulating water temperature measuring sensor 151 is a sensor for measuring the temperature change of the circulating water in the chamber, and the temperature sensor is installed between the circulating water outlet and the pressure sensor.

The circulating water pressure sensor 158 measures the pressure of the circulating water by placing it between the inlet of the circulating water and the temperature sensor. The circulating water pressure sensor 158 can set a pressure condition for measuring the pressure of the circulating water supplied into the test chamber and detects the leakage using the pressure signal when leakage occurs due to the time .

The noncontact optical displacement sensor 163 detects the clearance change or clearance between the rotating ring 157 and the stationary ring 160 that occurs when the rotating ring 157 rotates at high speed in the circulating water pressure operating state inside the chamber .

The torque and force sensor 170 is mounted between the stationary ring support 168 and the rear cover 162 as a sensor for measuring the torque and force acting on the stationary ring 160 by the rotary ring 157.

Here, the force is a force that the rotating ring 157 pushes in the axial direction toward the stationary ring 160, and the torque is a force to rotate the stationary ring 160 while the rotating ring 157 rotates at high speed. The torque and force sensor 170 is designed to measure the force exerted by the rotating ring 157 on the stationary ring 160 upon occurrence of contact surface wear over time under pressure (P) and rotational speed (V) Changes in the components can be observed.

The acoustic sensor 171 is a sensor for detecting leakage and increase in leakage by observing changes in elastic waves generated when contact wear and leakage occur at the sealing portions of the rotary ring 157 and the fixed ring 160, Allow the test chamber to be installed vertically on the test chamber housing area nearest the perimeter. The acoustic sensor 171 is attached using a magnetic holder for fixing to the test chamber housing.

The fixed ring temperature measuring sensor 175 is a sensor for measuring a temperature change of the stationary ring 160 caused by the contact of the rotating ring 157 and the stationary ring 160 and mounts the sensor in the vicinity of the stationary ring.

6 is a block diagram of the fluid circulation module 300 of the pump mechanical seal life evaluation test apparatus. The fluid circulation section 300 includes flow control valves 325 and 345, a heater 382, a cooler 375, a piston pump 370, and a flow control valve 375 to supply high temperature and high pressure circulating water to the test observation module 100. [ A temperature sensor 330, a pressure sensor 335, relief valves 355 and 360, an accumulator 380 and a directional control valve 365, etc. for system protection .

The circulation water discharged from the test observation module 100 flows from the branch pipe back to one common pipe and flows through the flow control valve 320, the low pressure relief valve 355 and the high pressure relief valve 360, the cooler 375 And is returned to the storage tank 390 in a close-loop manner.

The rotational speed of the piston pump 384 is designed to be automatically adjusted by the inverter after the comparison of the flow rate value set by the user and the measured values of the flow meters 320 and 340 installed in the common pipe. The rotational speed of the piston pump 384 is supplied to the mechanical seal Is controlled by the motor rotational speed of the piston pump 384 and the flow rate control valves 325 and 345. [

A small capacity type flow control valve 325 is provided at the rear end of each experimental apparatus to control the flow rate supplied to the test observation module 100. In order to control the flow rate supplied to the entire pump mechanical seal life evaluation test apparatus, An intermediate capacity type flow control valve 345 is provided in front of the valves 355 and 360.

The flow meters 320 and 340 are installed at the entrance and exit sides of the test observation module 100 so as to measure the flow rate supplied to each test observation module 100 and the flow rate passing through the test observation module 100, To measure the total flow rate except for the amount of leaks at the site

And is installed at the front end of the relief valves 355 and 360. [

The directional switching valve 365 disposed between the discharge side and the return line of the piston pump 384 maintains a normal close state during normal operation to maintain the discharge pressure of the supply line of the piston pump 384, It is designed to open the valve in case of an emergency such as a rise and to pull the pressure of the pump discharge line to the return line.

The line filter 381 is installed between the piston pump 384 and the mechanical seal, and the return filter 370 is installed in the pipe where the circulating water is recovered. The suction filter 386 is installed between the storage tank 390 and the piston pump 384 to remove foreign matter mixed with the circulating water.

A low pressure relief valve (355) is installed to control the pressure formed in the pump mechanical seal life test apparatus up to 55 bar. In order to prevent damage to the pump due to pressure generation of 55 bar or more, which is the allowable pressure of the pump, A relief valve 360 is provided in a parallel line.

The temperature of the circulating water is adjusted by controlling the operation of the heater 382 by receiving feedback of the measured value from the temperature sensor installed in the accumulator 380 line located at the front end of the test observation module 100.

The cooler 375 automatically detects when the temperature of the circulating water is higher than the cooling temperature set by the user, so that the on-off operation is performed, and the capacity is set so as to reach the set value within a short time.

When the temperature of the circulating water measured by the temperature sensor 330 at the front end of the experimental apparatus is 93, the alarm indicating lamp is turned on. When the temperature reaches 95, the experimental apparatus operation is tripped Respectively.

A level gauge is provided to measure the level of the circulating water in the storage tank 390. In addition, the warning indicator lamp is turned on when the level of the circulating water is lower than 1/2 of the height of the storage tank 390 by receiving the level gauge measurement value.

7 is a view showing a principle diagram for measuring the leakage weight of the fluid circulation module. The leakage weight measuring device 318 of the fluid circulation module measures the amount of circulating water that has leaked through the interference surface of the mechanical seal due to abrasion at the contact surface of the mechanical seal. And a load cell, and is installed at the lower end of the chamber rear cover 162. [0033]

The basic circuit configuration of the leakage weight measuring device 318 of the fluid circulation module is as shown in Fig. 7, in which leakage occurs on the interference surface between the rotating ring 157 of the test observation module 100 and the fixed ring 160, And the fluid is filled up to 90% of the measuring range of the load cell in the reservoir 316 on the side direction changeover valve side, the No. 2 and No. 3 valves are automatically closed and the No. 2 and No. 3 valves are opened.

When the fluid in the reservoir 317 on the direction changeover valve side is filled with the fluid, the No. and No. valves are automatically closed and the No. and No. valves are opened. At this time, the operation signal of the directional control valve can be simultaneously transmitted. The leaked circulating water is finally sent to the storage tank 390.

8 is a schematic view showing a data acquisition and control module configuration diagram of the pump mechanical seal life evaluation test apparatus according to the present invention.

8, the data acquisition and control module 500 according to the present invention includes a control PC and a monitor 505, a main controller 510, a motion board for controlling a servo motor 515, a sound signal measurement board 520 ), A temperature signal measurement board (circulation water) 525, a pressure signal measurement board 530, a torque and force measurement board 535, a water level measurement board 540, a flow measurement board 545, A displacement measurement board 555, and a temperature signal measurement board (fixed ring) 560.

The control PC and monitor 505 of the data acquisition and control module 500 display the various acquisition signals on the screen and store the measurement data.

The main controller 510 of the data acquisition and control module 500 controls the heater to increase the temperature of the circulating water to be supplied or controls the supply pump motor speed of the circulating water using the inverter, It is possible to control the flow rate supplied to the test observation module 100 or to control the cooler to lower the temperature of the circulating water to be supplied or to control the system pressure of the circulating water by using the relief valve, .

The motion board 515 for servo motor control of the data acquisition and control module 500 is for controlling the rotation speed of the servo motor using the servo motor drive.

The acoustic signal measurement board 520 of the data acquisition and control module 500 observes changes in seismic waves generated upon contact wear and leakage at the sealing portions of the rotating ring and the stationary ring to detect an elastic wave signal . The acoustic sensor 171 is a sensor for detecting leakage and increase in leakage by observing changes in elastic waves generated when contact wear and leakage occur at the sealing portions of the rotary ring 157 and the fixed ring 160, Allow the test chamber to be installed vertically on the test chamber housing area nearest the perimeter. The acoustic signal measured by the acoustic sensor 171 is measured by the acoustic signal measurement board 520 by attaching the acoustic sensor 171 using a magnetic holder for fixing the acoustic sensor 171 to the test chamber housing.

At this time, the acoustic signal measurement board 520 compares and analyzes the acoustic signal data according to the leakage state and leakage amount in the simulation test through the built-in Lab-View based correlation analysis program. The data values thus analyzed can be confirmed by the signal analysis computer of the data analysis and display module 900.

The temperature signal measurement board (circulating water) 525 and the pressure signal measurement board 530 of the data acquisition and control module 500 measure the temperature of the circulating water supplied into the test observation module 100 chamber, To set the pressure condition for measuring the pressure of the circulating water supplied into the chamber of the test observation module 100 and to detect the leakage using the pressure signal when the leakage occurs due to the wear of the sealing contact surface over time .

The torque and force measurement board 535 of the data acquisition and control module 500 measures the amount of rotation torque transmitted from the drive servomotor to the test observation module 100 and determines the change in the friction load received from the test observation module 100 And observes changes in the force components of the rotating ring on the stationary ring under the conditions of pressure (P) and rotational speed (V), which are the main operating variables affecting the performance of the test observation module 100 .

The level measurement board 540 and the flow measurement board 545 of the data acquisition and control module 500 measure the flow rate supplied from the fluid circulation module 300 to the test observation module 100, In order to measure the water level.

The leakage measurement board 550 of the data acquisition and control module 500 is for measuring the amount of leakage due to the occurrence of abrasion at the contact surface of the mechanical seal and the displacement measurement board 555 is for detecting a circulating water pressure acting state And the clearance between the rotating ring 157 and the stationary ring 160 that occurs when the rotating ring 157 rotates at a high speed.

The temperature signal measurement board (fixed ring) 560 of the data acquisition and control module 500 is used to observe the temperature change observation of the stationary ring 160 caused by the contact friction between the rotating ring 157 and the stationary ring 160 To detect a change in contact wear amount of the stationary ring (160).

Fig. 9 is a screen showing the operation state of the entire simulator. FIG. 10 is a display screen showing various operation and performance data in the data analysis and display module, and FIG. 11 is a screen for displaying the results of sound analysis of the data analysis and display module.

As shown in Fig. 9, the data analysis and display module 900 according to the present invention includes a screen showing the operating state of the entire simulated test apparatus, a display screen showing various operation and performance data, As shown in Fig. 11, it includes a screen for displaying sound measurement results and a screen for storing test data as shown in Fig. 12, and developed as a program based on Lab-View.

The screen showing the operation state of the entire simulated test apparatus of the data analysis and display module 900 includes a fluid circulation module state display unit 920 indicating a circulating water temperature and pressure state of the fluid circulation module 300, 100), a circulation water temperature and pressure, a torque and a force, etc., and a leakage amount indicating the amount of leakage due to wear on the contact surface of the mechanical seal in the test observation module (100) A display unit 940, an operation condition control and display unit 950 for controlling and displaying the operation state of the simulated test apparatus such as pump start / stop, pump rotational axis speed, circulating water temperature and leakage amount control mode setting, and control status display.

The display screen showing various operation and performance data of the data analysis and display module 900 includes a test observation module status display unit 901 for indicating the status of the rotational axis speed, circulating water temperature and pressure, torque, A flow rate analyzing unit 902 for measuring the flow rate in accordance with the measurement time in the unit test observation module, a temperature and pressure analyzing unit 903 for indicating the temperature and pressure according to the measurement time in the unit test observation module, A torque and force analyzer 905 for indicating the degree of twisting and compression of the stationary ring according to the measurement time in the unit test observation module, A temperature analyzing section 906 of the stationary ring showing the temperature of the stationary ring according to the measurement time in the unit test observation module, Can be circulated in accordance with the measured time is composed of leakage analysis unit 907 in.

The screen for displaying the acoustic measurement results of the data analysis and display module 900 observes the contact wear at the sealed portion between the rotary ring and the fixed ring installed in the test observation module 100 and the change of the elastic wave generated when the leakage occurs, And an acoustic signal average voltage analyzer 909 for evaluating an average voltage (RMS) change of an acoustic signal with respect to a leakage amount according to a measurement time, And an acoustic signal amplitude analyzer 910 for evaluating an amplitude change of the acoustic signal with respect to the leakage amount.

The screen for storing the test data of the data analysis and display module 900 includes a data storage folder and a data storage file name designation, a data storage cycle setting in seconds, a minute data file creation cycle setting for a new file, It is configured to store various test data such as folder and data storage file name designation.

The operation procedure of the pump mechanical seal life evaluation test apparatus according to the present invention will be described with reference to Figs. 9, 12 and 13. Fig.

First, the main power switch inside the power supply box installed in the electric control module 700 is turned on. When the main power is connected, the computer of the data analysis and display module 900 is turned on.

Before the test apparatus is driven, a part to be checked is that a fluid that has flowed out from the pump discharge side is supplied to a mechanical seal portion of the test observation module 100 to cool the heat generated at the contact portion, and then a recirculation structure The cooling water circulation control switch should be set so as to circulate so that the switch is always in the circulation position when the test apparatus is driven. Then, as shown in FIG. 9, a program for driving the test apparatus is displayed on the screen showing the operation state of the entire simulator, and the operation button 908 is clicked on the main screen. The program and the test apparatus are connected to the test preparation state .

In the data storage of the test apparatus, on the screen showing the operation status of the entire simulated test apparatus of FIG. 9, when the operation setting of No. is clicked, a screen window for saving the test data as shown in FIG. 12 is activated. In FIG. 12, the temperature alarm setting value is set to the alarm setting value when the temperature of the cooling water tank rises above the set value. Then, the maximum value of the rotation axis speed of chambers 1 to 3 of the test observation module 100 is set. Then click the Save button to specify the data save folder and the data save file name. The number sets the data storage period in seconds and sets the file creation interval in seconds for new files. No. 1 to 3 test observation module (100) Click to save only the mechanical seal sample to be stored for each chamber. Save the sound measurement data folder and the data save file name in the same way as setting operation data.

Data storage can be done by driving the test device, but it is effective to do so before the drive.

Next, control and display of the operation status of the simulator is performed for setting the pump start / stop, the rotational speed of the pump shaft, the circulating water temperature, and the leakage amount control method. 13, the right screen 950 of the screen showing the operating state of the entire simulator is used. This screen is an operation condition control and display unit 950 for controlling and displaying the operation state of the simulated test apparatus such as pump start / stop, pump rotational axis speed, circulating water temperature and leakage amount control method setting, and control status display. Enter the operation condition by numeric input and button click method to set the operation condition.

Detailed operation for simulated test device operation state control and display, for example, using the screen shown in FIG. 13, can be performed as follows.

First click on the Main Pump button and enter a number from 1 to 100 where you want to enter a number (the maximum output of the pump is 100%) and click the Run button to start the pump. Then click on the button for chambers 1 ~ 3 and enter the RPM value and click Start. When you stop, click Stop.

In addition, there are manual and automatic modes as the temperature control unit, and when using the manual mode, adjust the temperature to prevent the test equipment from being overloaded by using the heater, the circulation pump and the cooler button. When the temperature control is completed, the next leak rate control switch controls the leakage circulation water not to overflow in the reservoirs 316 and 317 when leakage occurs in the two reservoirs 316 and 317 according to the wear of the seal. And manual setting is possible.

The tested stationary ring and mechanical seal (stationary ring and rotary ring) first remove the front chamber rear cover 162 and then remove the stationary ring support 168 for supporting the stationary ring 50, And after the rotary ring 30 is collected, the new stationary ring 50 and rotary ring 30 are replaced.

According to the apparatus for evaluating the life of the pump mechanical seal according to the present invention, the abrasion amount of the mechanical seal (the stationary ring and the rotating ring) according to various operating conditions (performance parameters) The degree of abrasion can be obtained through data.

The present invention relates to a method and an apparatus for precisely evaluating the performance degradation of a mechanical seal for accurately predicting the life of a mechanical seal, and more particularly, to a method and an apparatus for precisely estimating the life of a mechanical seal, A variety of abrasion and leakage conditions, such as seal performance degradation, can be simulated with test specimens to set criteria for acoustic signals, displacement sensors, and load cell signals based on performance degradation conditions.

The present invention can evaluate the remaining life of the mechanical seal by inputting the performance parameters of the pump in use into the life evaluation test apparatus and testing the mechanical seal until the performance deterioration of the mechanical seal in use. By acquiring the service life data according to the performance variable, it is possible to evaluate the present performance degradation state and the service life from the acoustic measurement results of the pump mechanical seal operating in the field.

It is possible to use the acoustic signal data corresponding to the leakage state and leakage amount during the pump mechanical seal life evaluation test in the step of correcting the acoustic signal sensitivity of the acoustic measuring device before the field measurement. In addition, the measurement results can be calibrated by comparing and analyzing with the data in the field measurement. Furthermore, since the field conditions can be reproduced in the life evaluation test apparatus, the accuracy of the acoustic characteristic data measured in the field can be improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

The present invention evaluates the current service life of a mechanical seal by simulating the performance degradation of a mechanical seal which is a core device for sealing a fluid circulating in a pump used in industrial facilities such as power plants and chemical plants, It is possible to provide a pump mechanical seal life evaluation test device which can be accurately predicted, so that the possibility of industrial use is very high

30: Mechanical seal Rotation ring 40: Thrust surface
50: Mechanical seal fixing ring 100: Test observation module
110: Servo motor 151: Temperature measurement sensor
158: pressure measuring sensor 163: non-contact optical displacement sensor
170: Torque and force sensor 171: Acoustic sensor
300: fluid circulation module 318: leakage weight measuring device
320: flow control valve 355, 360: relief valve
384: Piston pump 390: Storage tank
395: Operation condition control and display part 500: Data acquisition and control module
700: electrical control module 900: data analysis and display module

Claims (20)

In a pump mechanical seal life test apparatus,
To simulate various abrasion and leakage conditions, which is a phenomenon of deterioration of mechanical seal performance due to fluid pressure, fluid temperature and shaft rotation speed, which are important parameters for pump mechanical seal performance, a test observation module a test module;
A fluid circulation module for providing a test observation module with changes in fluid pressure and fluid temperature which are major factors affecting performance degradation of the mechanical seal;
A data acquisition & control module for collecting data measured by various sensors in the test observation module and the fluid circulation module and for controlling the operation of the test device;
An electric power control module for supplying and controlling power to each module; And
And a data analysis & display module for analyzing and displaying data measured by various sensors in the test observation module and the fluid circulation module. The method according to claim 1,
Wherein the test observation module is a device for artificially simulating the performance degradation of a mechanical seal test specimen and comprises a servomotor, a drive, a bearing, and a housing for providing rotational force of the rotational shaft. The method according to claim 1,
And a housing having a recirculation structure for allowing the fluid, which has exited from the pump discharge side, to be supplied to the mechanical seal portion to cool the heat generated at the contact portion and then enter the pump again, Device. The method according to claim 1,
Wherein the fluid circulation module comprises a piston pump, a flow rate control valve, an accumulator, a relief valve, a direction switching valve, a heater, a cooler, and a storage tank. The method according to claim 1,
The fluid circulation module is required to select a pump that does not cause a change in flow rate and pressure in the system due to a load fluctuation. Therefore, it is possible to obtain a high pressure by minimizing the discharge amount, And a piston pump which is a reciprocating pump of the pump type mechanical seal. The method according to claim 1,
And an accumulator for preventing the circulation loop and the instrument from being damaged when the pressure of the fluid supplied from the pump to the fluid circulation module is unstable or excessive pressure is generated. The pump mechanical seal life evaluation Test equipment. The method according to claim 1,
And a relief valve for preventing damage to the pump when a pressure exceeding a maximum permissible pressure of the pump is applied to the fluid circulation module. When the excessive pressure rises, the valve is opened to return the pressure of the pump discharge line And a direction switching valve for allowing the pump to pass through the line. The method according to claim 1,
Wherein the fluid circulation module comprises a heater, a cooler, and a storage tank for controlling and storing the temperature of the fluid in the fluid circulation module. The method according to claim 1,
The data acquisition and control module includes a control PC and monitor, a main controller, a motion board for servo motor control, an acoustic signal measurement board, a temperature signal measurement board (circulating water), a pressure signal measurement board, a torque and force measurement board, A flow measurement board, a leakage measurement board, a displacement measurement board) and a temperature signal measurement board (fixing ring). The method according to claim 1,
The test acquisition module of the data acquisition and control module can constitute a torque and force sensor, a circulating water pressure sensor, a circulating water temperature sensor and a fixed ring temperature measuring sensor, an acoustic emission sensor and a torque sensor for data acquisition and control. It is also equipped with a pressure sensor and analog pressure gauge, temperature sensor, flow sensor and load cell in the fluid circulation module. The method according to claim 1,
The test-observation module connected to the data acquisition and control module is provided with a rotating ring when the contact surface wears over time under fluid pressure (P), fluid temperature (T) and pump shaft rotational speed (V) And a torque and force sensor for observing a change in a force component acting on the stationary ring. The method according to claim 1,
The test observation module connected to the data acquisition and control module is provided with a pressure condition setting for measuring the pressure of the circulating water supplied to the test observation module chamber and a pressure condition signal for leakage due to the sealing contact surface wear due to the passage of time A circulating water temperature sensor for measuring the temperature of the circulating water supplied to the inside of the test observation module chamber to set the temperature condition, a contact between the rotating ring and the stationary ring Characterized in that it comprises a fixed ring temperature measuring sensor for checking whether the change of contact wear amount of the stationary ring is observed by observing the temperature change of the stationary ring caused by friction. The method according to claim 1,
The test observation module connected to the data acquisition and control module includes an acoustic sensor for detecting contact wear at the sealing portion of the rotating ring and the stationary ring and for detecting leakage and leakage increase by observing the change of the elastic wave generated at the occurrence of leakage Test apparatus for the life evaluation of pump mechanical seals. The method according to claim 1,
The test observation module connected to the data acquisition and control module is for measuring the amount of rotation torque transmitted from the drive servo motor to the test observation module and includes a torque sensor for observing a change in the friction load received by the test observation module Test apparatus for the life evaluation of pump mechanical seals. The method according to claim 1,
Wherein the fluid circulation module connected to the data acquisition and control module includes a load cell for measuring an amount of leakage due to wear on the contact surface of the mechanical seal. The method according to claim 1,
The data analysis and display module is provided with a display screen showing the operation status of the entire simulation test apparatus developed by the Lab-View based program, a display screen showing various operation and performance data, a screen displaying acoustic measurement results, And a screen for storing the pump mechanical seal life. The method according to claim 1,
The screen showing the operation status of the entire simulation test apparatus in the data analysis and display module includes a fluid circulation module status display unit, a test observation module status display unit indicating the status of the rotation axis speed of the test observation module, the circulating water temperature and pressure, , A leakage indicator indicating the amount of leakage due to abrasion at the contact surface of the mechanical seal in the test observation module, pump start / stop, pump rotational speed, circulating water temperature and leakage control method setting, and control status display. And controlling and displaying the operating condition of the pump mechanical seal. The method according to claim 1,
The display screen showing various operation and performance data in the data analysis and display module includes a test observation module status display unit indicating a status of a rotation axis speed, a circulation water temperature and pressure, a torque and a force of a unit test observation unit to be measured, A temperature and pressure analyzing unit that displays the temperature and pressure according to the measurement time in the unit test observation module, and a temperature and pressure analyzing unit that measures the rotation time of the motor rotation axis supplying the rotation force to the unit test observation module A torque and force analyzing section showing the torque of the motor rotation shaft torque analyzing section, the torsion and compression of the stationary ring according to the measurement time in the unit test observation module, and the temperature of the stationary ring according to the measurement time in the unit test observation module Temperature analysis part of stationary ring, measurement time in unit test observation module And a circulating water leakage amount analyzing unit. The pump mechanical seal
Life evaluation test apparatus. The method according to claim 1,
The screen for displaying acoustic measurement results on the data analyzing and display module detects seismic signals generated by contact wear and leakage generated at the sealed portion between the rotating ring and the fixed ring to detect seepage signals according to leakage and leakage amount, The average voltage (RMS) change of the acoustic signal with respect to the leakage amount according to the measurement time is evaluated and the amplitude change of the acoustic signal with respect to the leakage amount according to the measurement time is evaluated And the acoustic signal amplitude analyzing section capable of measuring the mechanical vibration of the pump mechanical seal. The method according to claim 1,
The screen for storing the test data in the data analysis and display module includes a data storage folder and a data storage file name designation, a data storage cycle setting in seconds, a minute file creation cycle setting for a new file, a sound data storage folder and data And storing various test data including a storage file name designation.

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