JP2020013581A - Liquid pump maintenance scheduler - Google Patents

Abstract

To provide a liquid pump maintenance scheduler which is practical and with which it is possible to estimate life with high accuracy taking into account a difference in the type of pump, a difference in the purpose of use of the liquid pump, and further a difference in actual operating conditions such as the operation policy of a user, etc.SOLUTION: The maintenance scheduler includes the functions (1) to (4) below. (1) Data processing process for classifying and normalizing sampling data; (2) Data processing process for classifying, normalizing, and standardizing field data accumulated from the past in order to evaluate the state of sampling data; (3) Function for comparatively examining the processed mutual data and determining present normality and estimating a remaining life, as well as estimating a spot to be maintained from now on and proposing a schedule for that; (4) Function for preserving the obtained sampling data and the history of determination results, and also updating the same as accumulated field data and updating an evaluation criterion.SELECTED DRAWING: Figure 13

Description

  The present invention relates to a state monitor (observation) of sliding parts such as various bearings of a liquid pump handling a liquid such as water, and a maintenance scheduler of the liquid pump for estimating a maintenance schedule of the liquid pump based on the monitoring.

  Water pumps such as centrifugal pumps and mixed flow pumps have rolling devices such as sliding members and rotary shafts supported by bearings. The sliding parts of these water pumps include a sliding part such as an underwater bearing that supports an impeller that is operated in a state of being immersed in water, and a shaft that seals the shaft from the water handled by the pump to the casing. There are a sealing device and a sliding portion such as a bearing that is supported outside of the casing while being partially immersed in lubricating oil.

  FIG. 1 is a cross-sectional view showing a configuration example of a single-stage water pump having two suction horizontal shafts as an example of a liquid pump. The water pump 100 includes a horizontally extending rotating shaft 101, an impeller 102 fixed to the rotating shaft 101, and a pump casing 105. One end (right end in the figure) of the rotating shaft 101 is connected to a rotating shaft of a driving machine such as an electric motor (not shown), and the impeller 102 is rotated in the pump casing 105 by the driving machine. The rotating shaft 101 is rotatably supported by bearings 109, 109 near both ends.

  A spiral chamber 105a is arranged in the pump casing 105, and the impeller 102 is arranged in the spiral chamber 105a. When the impeller 102 rotates with the rotation of the rotating shaft 101, the pressure of the water sucked from the suction port 103 increases due to the action of the impeller 102 and the swirling chamber 105 a, and the water is discharged from the discharge port 104. .

  The water pump 100 shown in the drawing has a double suction structure in which water is sucked from both sides by the rotation of an impeller 102, and water pressurized by the impeller 102 is supplied to a water inlet of the impeller 102. Wear rings 102A and 102B are respectively attached so as not to flow backward from 105a to suction port 103. Since the clearance between the wear rings 102A and 102B and the impeller 102 is designed to have a very narrow clearance, they may slide underwater depending on the operation state of the water pump 100.

  The rotating shaft 101 extends through the pump casing 105, and shaft sealing devices (for example, mechanical seals) 108, 108 are disposed in a gap between the rotating shaft 101 and the pump casing 105. The inside of the pump casing 105 is sealed to prevent water from leaking outside. Therefore, the water inside the pump casing 105 does not enter the bearing devices 109, 109. The shaft sealing devices 108 and 108 have a sliding portion, and when the sliding portion is worn, the parts constituting the sliding portion must be replaced depending on the degree of wear.

  A pressure difference occurs due to a difference in diameter between the wear rings 102A and 102B of the bearing device 109, a manufacturing error, and the like, and a thrust force is generated on the rotating shaft 101. The thrust force is supported by a thrust bearing unit 109A disposed in a bearing device 109 that supports one end side (left side in the figure) of the rotating shaft 101.

  Further, radial bearing units 109B, 109B for supporting the radial force generated on the rotating shaft 101 are arranged in the dual bearing devices 109, 109 so as to be located near both ends of the rotating shaft 101. The rotating shaft 101 is supported by a total of three bearings including these two radial bearing units 109B, 109B and one thrust bearing unit 109A. A ball bearing is used for the thrust bearing unit 109A, and a sleeve type bearing is used for each of the radial bearing units 109B and 109B.

  Each of the thrust bearing unit 109A and the radial bearing units 109B, 109B is lubricated by the lubricating oil stored in the lubricating oil storage tank 110. This lubricating oil is cooled by a cooling medium such as cooling water flowing in a cooling jacket 127 attached to the lubricating oil storage tank 110. By supporting the rotating shaft 101 with the cooling thrust bearing unit 109A and the radial bearing units 109B, 109B, the rotating shaft 101 can be rotated in a stable state.

  FIG. 2 is a cross-sectional view illustrating a configuration example of a multi-stage water pump on the horizontal axis as an example of the liquid pump. The water pump 200 includes a rotating shaft 201 extending horizontally, a plurality of impellers 202 fixed to the rotating shaft 201, and a pump casing 205. One end (right end in the figure) of the rotating shaft 201 is connected to a rotating shaft of a driving machine such as an electric motor (not shown), and the driving machine causes a plurality of impellers 202 to rotate inside the pump casing 205. I have. The rotating shaft 201 is rotatably supported by bearings 209, 209 in the vicinity of both ends.

  When the plurality of impellers 202 rotate with the rotation of the rotating shaft 201, water is sucked in from the suction port 203, and the pressure of the water is increased by the centrifugal action of the impeller 202 and discharged from the discharge port 204. At the water inlet of each impeller 202, a wear ring 206 is attached between the pump casing 205 and the impeller 202 so that the water pressurized by the impeller 202 does not flow backward to the previous stage. I have. Since the clearance between the wear ring 206 and the impeller 202 is designed to have a very narrow clearance, the impeller 202 and the wear ring 206 may slide underwater depending on the operation state of the water pump 200. is there.

  The rotating shaft 201 extends through the pump casing 205, and shaft sealing devices 208, 208 such as mechanical seals are disposed in a gap between the rotating shaft 201 and the pump casing 205. The pump casing 205 is sealed so as not to leak outside. Therefore, water in the pump casing 205 does not enter the bearing devices 209 and 209. The shaft sealing devices 208 and 208 also have sliding parts, and the sliding parts are worn. Therefore, depending on the degree of wear of the sliding part, the parts constituting the sliding part must be replaced.

  In the plurality of impellers 202, the thrust force generated by the pressure difference between the adjacent impellers 202 overlaps the number of the impellers 202 to generate a thrust force. Although this thrust force is offset by the balance device 207 provided in the water pump 200 having a multi-stage on the horizontal axis, a certain amount of thrust force remains during a transient operation or the like. This residual thrust force is supported by the thrust bearing unit 209A of the bearing device 209 on one end side (the left end side in the figure) of the rotating shaft 201.

  Radial bearing units 209B, 209B are disposed in the dual bearing devices 209, 209, respectively. The rotary shaft 201 is supported by a total of three bearings with these two radial bearing units 209B, 209B and one thrust bearing unit 209A. Have been. A ball bearing is used for the thrust bearing unit 209A, and a sleeve type bearing is used for the radial bearing units 209B and 209B.

  Both the thrust bearing unit 209A and the radial bearing units 209B, 209B are lubricated by the lubricating oil stored in the lubricating oil storage tank 210. This lubricating oil is cooled by a cooling medium such as cooling water flowing in a cooling jacket 227 attached to the lubricating oil storage tank 210. By supporting the rotating shaft 201 by the thrust bearing unit 209A and the radial bearing units 209B, 209B that cool as described above, the rotating shaft 201 can be rotated in a stable state.

  FIG. 3 is a cross-sectional view illustrating a configuration example of a horizontal-axis mixed flow pump as an example of a liquid pump. The water pump 300 includes a horizontally extending rotating shaft 301, an impeller 302 fixed to the rotating shaft 301, and a pump casing 305. One end (left end in the figure) of the rotating shaft 301 extending horizontally extends through the pump casing 305 and protrudes to the outside, is supported by a bearing device 309, and the other end is supported by a guide vane 316 in the pump casing 305. It is supported by an underwater bearing 311 arranged in 318. The impeller 302 is arranged on the bearing device 309 side adjacent to the inner cylinder 318. The end of the rotating shaft 301 on the bearing device 309 side is connected to the rotating shaft of a driving machine such as an electric motor (not shown), and the impeller 302 is rotated in the pump casing 305 by the driving machine. When the impeller 302 rotates together with the rotation of the rotating shaft 301, the water sucked from the suction port 303 is supplied to the impeller 302, and the impeller 302 applies a propulsive force to the guide vane 316 side, and the guide vane 316 Then, the water supplied from the impeller 302 is rectified so as not to be stagnated, and is discharged from the discharge port 304.

  In addition, a drain port 312 for discharging water in the pump casing 305 of the water pump 300 stopped during the pump fallow period to the outside of the casing is provided below the pump casing 305. At the top of the pump casing 305, at the start of the operation of the water pump 300, an equipment mounting port 314 for sucking water from the suction side into the pump casing 305 by suctioning and evacuating the atmosphere in the pump casing 305 with a vacuum pump. Is provided. A valve (not shown) is provided in each of the drain port 312 and the device mounting port 314, and the valve is closed when the water pump 300 is in a normal operation.

  As described above, the inner cylinder 318 is submerged in the pump casing 305 during operation of the water pump 300. The distance between the underwater bearing 311 and the rotating shaft 301 arranged in the inner cylinder 318 slides underwater with a very small clearance.

  A shaft sealing device 308 (for example, a mechanical seal or the like) is disposed in a gap between the rotary shaft 301 on the side where the driving machine is connected and the pump casing 305, whereby water inside the pump casing 305 is discharged to the outside. Sealed to prevent leakage. Therefore, the water inside the water pump 300 does not enter the bearing device 309. Since the shaft sealing device 308 also has a sliding portion, and the sliding portion also wears, the parts constituting the sliding portion must be replaced depending on the degree of wear.

  Since a propulsive force is applied to the guide vane side of the liquid such as water by the impeller 302, a thrust force is applied to the impeller 302 and the rotating shaft 301 in a direction of connecting the driving machine as a reaction. This thrust force is supported by a thrust bearing unit 309A disposed in the bearing device 309.

  In the bearing device 309, a radial bearing unit 309B for supporting a radial force applied to the rotating shaft 301 is arranged in addition to the thrust bearing unit 309A. The rotary shaft 301 is supported by a total of three bearings: the radial bearing unit 309B, the thrust bearing unit 309A, and the underwater bearing 311. Ball bearings and roller bearings are used for the thrust bearing unit 309A and the radial bearing unit 309B. Further, the thrust bearing unit 309A and the radial bearing unit 309B are lubricated by the lubricating oil stored in the lubricating oil storage tank 310.

  In the water pumps 100, 200, and 300 shown in the water pumps of FIGS. 1 to 3, lubrication of the bearing devices 109, 209, and 309 is performed using the lubricating oil stored in the lubricating oil storage tanks 110, 210, and 310. I have. In addition, lubricating oil may be supplied to each bearing device by a forced oil supply device as shown in FIG. FIG. 4 is a diagram showing a piping system of a forced oil supply device for supplying lubricating oil to the bearing devices 109 and 109 of the water pump 100 shown in FIG. 4 is substantially the same as FIG. 4, and the illustration and description thereof are omitted.

  The end of the rotating shaft 101 of the water pump 100 is connected to the rotating shaft of the electric motor M. A forced oil supply device 126 is arranged outside the water pump 100. Lubricating oil is forcibly supplied to the bearing devices 109 and 109 of the water pump 100 from the forced oil supply device 126. The forced oil supply device 126 includes components such as a lubricating oil pump 121, a filter 124, a lubricating oil cooler 123, a plurality of hydraulic observation instruments 125, and a lubricating oil tank 122.

  As shown in FIG. 1, the water pump 100 has a shaft seal that prevents mixing of water and the atmosphere (lubricating oil depending on the pump) in the bearing devices 109 and 109, the impeller 102, the pump casing 105, and the wear rings 102 </ b> A and 102 </ b> B. Like the devices 108, 108, the thrust bearing unit 109A in the lubricating oil, and the radial bearing units 109B, 109B, sliding parts having different use environments, functions, and roles are provided. These sliding parts gradually wear out with the elapse of use time. Inspection work such as this wear is regularly performed. There are two main types of periodic inspections: regular inspections that are simple but frequently performed, and disassembly inspections that disassemble the pump and replace or repair maintenance parts according to the internal conditions. Disassembly and inspection are not performed frequently because the water pump 100 during continuous operation is stopped and disassembled, which requires a long construction period and a large amount of cost.

  That is, the water pump includes a plurality of sliding parts having different use environments and different functions / roles as described above even if only the sliding parts to be maintained are viewed. The maintenance time of the individual parts constituting these sliding parts is long or short, and they are different from each other. However, there is a problem from the economical point of view that disassembling the inspection parts and consumables at different replacement periods.

  By the way, regarding overhauls, since water pumps are used in pumping / drainage facilities up to now, from the viewpoint of the reliability of maintenance and management of social infrastructure functions, after the occurrence of abnormal phenomena such as failure of equipment used, etc. Preventive maintenance has been adopted, rather than post-maintenance, where equipment is overhauled, to deal with them before they become apparent.

  The concept of preventive maintenance is as follows. In order to maintain equipment by preventive maintenance, it is necessary to set a standard number of years for repair and replacement, which is a guide for repair and replacement of each equipment. In particular, for equipment that is fatal when a breakdown stops and for which it is difficult to monitor the status (trend management), it is necessary to implement time-planned maintenance (periodic replacement / renewal) to maintain the reliability of the equipment. is there.

  FIG. 5 is a diagram (conceptual curve diagram) showing a typical concept relating to “the number of years of use of equipment and the failure rate”, which is the basis of the concept of the preventive maintenance. FIG. 5 shows that the transition of the failure of the device is such that after the initial failure occurs frequently at the beginning of the installation, a stable period occurs in which the failure rarely occurs, and thereafter, the device eventually wears and the failure occurs again frequently. The empirical concept is generally and qualitatively expressed. The vertical axis indicates the failure rate, and the horizontal axis indicates the elapsed year.

  T1 indicates a period in which the early failure period failure rate decreases, T2 indicates a period in which the accidental failure period failure rate is constant (useful life), and T3 indicates a wear failure period failure rate increase period. Here, the standard years of repair / replacement are substantially the same as the service life of the equipment, and basically, repair / replacement almost coincides with the period when the failure rate increases, that is, the wear-out failure period. If the equipment is replaced before the time when the failure rate increases, the increase in the failure rate is suppressed to a certain level or less, and the reliability of the entire equipment can be secured.

  If the replacement is performed earlier than the service life T2, an increase in the failure rate is easily suppressed, but the running cost tends to increase. On the other hand, if replacement is performed at a time closer to the service life T2, the running cost tends to decrease, but the reliability may decrease due to an increase in the failure rate.

  By the way, it is very difficult to set the standard years of repair / replacement (or the service life of the equipment) in a pump constructed by combining a large number of equipment.

  Until now, the maintenance cycle of performing overhauls in accordance with the concept of preventive maintenance has been performed according to the parts with the shortest maintenance time among the maintenance times of individual parts. Had been done. Performing maintenance to perform overhauls at this determined time is called "time planning maintenance". Such a method can be applied to one overhaul even if the parts are still in a healthy state, for example. They will also replace them.

  Furthermore, in the pumping / drainage equipment, there may be a case where there are a plurality of water pumps and a case where there is no spare machine. When there are a plurality of water pumps, the water pumps may have different pump types and pump diameters. In addition, there are also main drive units (engines and electric motors) other than water pumps, and devices that control the rotational speed of clutches and inverters. When considering the overall maintenance of the pumping / drainage facilities, it is necessary to maintain time that takes these factors into account. Becomes

  In addition, the water pump in the pumping / drainage equipment has a so-called difference in pump type depending on the structure of the pump and the type of the rotating shaft, a difference in drainage, tap water, or handling water such as river water and seawater, and so-called pump usage. The degree and factors of device degradation differ depending on the differences and the user's operation policy. Therefore, there may be a case where there is no problem in the state of the replacement part, a case where the replacement part should be replaced sooner, or a case where it is not wear but other factors such as corrosion. That is, it is necessary to estimate the practical life with high accuracy from not only the qualitative tendency as described above but also the actual motion conditions and the like.

  For this reason, it has been pointed out that it is not always economically effective to perform inspections at intervals uniquely determined by time maintenance, and also from the viewpoint of practical maintenance. In recent years, a system for observing the operating state of a rotating device and detecting an abnormality has been proposed.

  For example, in Patent Literature 1, displacement, velocity, acceleration, and vibration spectrum data collected from a rotating device are used as state diagnosis means in order to improve the accuracy of state diagnosis of the rotating device and perform sufficient maintenance. By comparing impact data collected from the bearings of rotating equipment with the reference values of each parameter based on the data, including lubricating oil property analysis data as necessary, abnormalities of rotating equipment, Alternatively, it has been proposed to perform a state diagnosis for the presence or absence of a sign of abnormality, and further notify the maintenance frequency of each rotating device to the outside according to the diagnosis result by the diagnosis result notifying means.

  Further, in Patent Literature 2, a lubricant deterioration evaluation apparatus and a lubricant evaluation system capable of comprehensively evaluating the deterioration state of a lubricating oil used in a gearbox and judging the deterioration state of the lubricating oil. Has been proposed. Specifically, a part of the lubricating oil discharged from the gearbox is extracted, impurities contained in the extracted lubricating oil, a lubricating oil property analyzer for analyzing at least the viscosity of the lubricating oil, and a new lubricating oil. It is sent to the lubricating oil property analyzer and the results of the analysis of the amount and viscosity of the contaminants contained in the lubricating oil and new oil analyzed by the lubricating oil property analyzer are classified into four stages (A to D). And a system for judging deterioration of the lubricating oil based on the respective evaluation results.

  In the above proposal, an attempt has been made to make a comprehensive diagnosis by observing the state of the bearing and the machine and the state of deterioration of the lubricating oil from the state of the mechanical bearing and the state of the lubricating oil. However, in a water pump, even when the temperature and vibration of the bearing portion related to the lubricating oil are observed and no abnormality is detected, when the lubricating oil is examined, the amount of generated wear powder is lower than normal. In many cases, when the water pump was disassembled and inspected, it was found that the bearings immersed in the lubricating oil had started to be damaged.

  In addition, depending on the handling water, the operation policy of the user, and the like, the operating time of the water pump per year is short, and it may be more appropriate to consider the pump life due to other factors than the wear of the bearing and the properties of the lubricating oil. In such a case, the life of the pump due to, for example, corrosion or cavitation progress should be considered. That is, in the case of a water pump, since there are a plurality of sliding portions having different use environments and roles, data detected and obtained is often information in which a plurality of factors overlap. For this reason, there is a problem that the above proposed conventional general observation system cannot cope.

JP 2005-77111 A JP 2013-117427 A

  The present invention has been made in view of the above points, and in a liquid pump that handles a liquid such as water, a liquid obtained by observing a state of a machine and information obtained by observing a state of a lubricating oil are used as a liquid pump. The state of various bearings and the like that compose the pump is estimated by integrating the information, and based on the estimated state, an economically effective inspection and an inspection time are proposed based on the pre-failure response or early detection of the failure. It is an object to provide a maintenance scheduler for a liquid pump that can perform the maintenance.

  In particular, so-called pump types such as pump structures and shaft types in pumping / drainage facilities, liquids used in drainage, tap water, river water, seawater, etc., so-called differences in the use of liquid pumps, and users It is an object of the present invention to provide a maintenance scheduler for a liquid pump capable of estimating a practical life with high accuracy in consideration of a difference in actual operation conditions such as an operation policy.

In order to solve the above problems, the present invention is a maintenance scheduler for a liquid pump, which observes the operation status of a liquid pump having a plurality of sliding parts, and estimates and proposes a maintenance schedule of the liquid pump, A classification function, a standardization function, a search function, a comparison function, an evaluation estimation function, and a history management function are provided. The classification function estimates the field data of the liquid pump and the maintenance schedule accumulated up to now. The operation status observation data of the estimated liquid pump is a basic classification function of classifying the liquid pump into a plurality of groups according to at least the type and model of the liquid pump and a difference in usage.The standardization standardization function includes a plurality of basic classification functions. The field data classified into groups are compared for each group by the comparison function and the evaluation estimation function. Normalize and standardize the operation elapsed time data of the liquid pump, the operation status observation data, and the lubricating oil property observation data so that the comparison and evaluation estimation can be performed positively, and the operation elapsed time of the estimated liquid pump, the operation status observation data and The function for standardizing and standardizing the lubricating oil property observation data, the search function is a function of searching for field data of a group corresponding to the estimated liquid pump from field data classified into the plurality of groups. The comparison function is a function of comparing the standardized and standardized data of the liquid pump to be estimated with the standardized and standardized data of the field data searched, and the evaluation estimation function is Evaluate whether there is an abnormality in the operation status observation data of the estimated liquid pump from the comparison result compared by the comparison function. The function of estimating an abnormal part if there is an abnormality, the history management function records and stores at least the comparison result in the comparison function and the evaluation result and the estimation result in the evaluation estimation function, and The maintenance scheduler for a liquid pump has a function of feeding back to field data and updating the field data as needed.

  Further, in the maintenance scheduler for a liquid pump according to the present invention, the function of standardizing and standardizing the operation elapsed time of the liquid pump is a function of converting the operation elapsed time into a ratio of a life time until a failure of the liquid pump. The function of normalizing and standardizing the operation status observation data of the liquid pump is a function of converting the observation value of the operation status observation data of the liquid pump into a multiple of the normal observation value of the liquid pump. It is characterized by.

  Further, in the present invention, in the maintenance scheduler of the liquid pump, in addition to the basic classification function, the classification function may include the field data and the estimated liquid pump depending on a difference in a user's operation policy of the liquid pump. And an operation policy classification function of classifying the sampling data into groups.

  In the present invention, in the maintenance scheduler for the liquid pump, the classifying function may classify the field data and the sampling data from the presumed liquid pump into groups according to a cause of failure, in addition to the basic class function. It is characterized by having a function of classifying failure causes.

  Further, in the maintenance scheduler of the liquid pump, the mechanical state observation data is a temperature of a bearing to which the estimated liquid pump lubricating oil is lubricated, and the lubricating oil property analysis data is the estimated liquid of the estimated liquid. It is characterized by the concentration of wear powder in the lubricating oil for lubricating the bearing.

  Further, in the present invention, in the maintenance scheduler of the liquid pump, the mechanical state observation data and the lubricating oil property observation data included in the field data are selected, and from the start of the operation of the liquid pump to the failure, each is selected. The tendency of the monitoring data to become abnormal from the normal value is that the field data is divided into two groups depending on which of the mechanical state observation data and the lubricating oil property observation data comes first. Not included in the group that failed due to bearing damage due to other factors, not due to oil deterioration, and groups that occurred after abnormalization were included in the group that caused failure due to the deterioration of the lubricating oil. It has a classification function.

  Further, the present invention is characterized in that in the maintenance scheduler for the liquid pump, the evaluation estimation function proposes a maintenance schedule for judging a next maintenance time and maintenance contents.

  Further, the invention is characterized in that, in the maintenance scheduler of the liquid pump, the mechanical state observation data is a vibration acceleration or a vibration amplitude value, a vibration speed, a rotation speed N, or a multiple of the rotation speed N of the liquid pump. And

  Further, in the maintenance scheduler of the liquid pump according to the present invention, the comparison function and the evaluation / estimation function may use the state transition between the value of the mechanical state observation data and the value of the lubricant property analysis data of the estimated liquid pump. By comparing which of the liquid pumps is abnormal, it is determined which of the abnormalities precedes, thereby estimating the abnormal location of the estimated liquid pump.

  Further, in the maintenance scheduler of the liquid pump according to the present invention, the evaluation estimating function includes an urgency determining function of determining an urgency for the abnormality at the abnormal location, and issues an alarm when it is determined to be urgent. Features.

  Further, in the maintenance scheduler of the liquid pump, the mechanical state observation data is a bearing temperature at which lubricating oil of the estimated liquid pump is lubricated, and the lubricating oil property analysis data is the estimated liquid pump. Is the concentration of wear powder in the lubricating oil circulating in the bearing, and the horizontal axis represents the elapsed operating time of the liquid pump as a percentage of the life time, and the vertical axis represents the bearing temperature and wear powder concentration of the liquid pump to be liquid. The liquid pump creates a graph showing the relative ratio between the bearing temperature and the wear powder concentration at normal times, and the graph shows the bearing temperature and the normal level of the wear powder concentration when the estimated liquid pump is in normal operation. In addition to setting the relative ratio, a threshold level when the bearing temperature and the wear powder concentration become abnormal is set by the relative ratio, and the bearing temperature or the wear powder concentration of the estimated liquid pump becomes When the threshold level is exceeded, a warning is given, and when the bearing temperature or the concentration of abrasion powder in the lubricating oil is between the normal line and the threshold line, a predetermined elapsed operating time is waited during which the bearing temperature and the lubricating oil Observe the wear powder concentration, whether the bearing temperature or the wear powder concentration in the lubricating oil is increasing toward the threshold level, whether there is no change in the bearing temperature or the wear powder concentration in the lubricating oil, or the normal level It is characterized in that it has a function of judging whether or not the number has decreased, and a function of notifying that fact.

According to the present invention, the following effects can be expected.
Even in the case of a liquid pump in which there are multiple sliding parts with different usage environments and roles, typical data up to the failure based on past field data and maintenance for a specific maintenance part of the liquid pump By comparing the actual measurement data at the time, the damage location can be estimated, and it is possible to propose the next maintenance schedule, the life expectancy, and the degree of urgency and the preparation period to cope with the abnormality.

  In addition, past field data for many liquid pumps are classified into multiple groups according to the type, type, and intended use of the liquid pumps, and observations of liquid pump operation elapsed time and parameters for estimating maintenance schedules The standardized values are standardized and standardized, and field data corresponding to the liquid pump for estimating the maintenance schedule is searched from among the field data classified into a plurality of groups and standardized and standardized.・ Compared with standardized field data and standardization of liquid pump for estimating maintenance schedule ・ Compare with standardized data to estimate the presence / absence of abnormalities in liquid pumps. Considering the differences in the intended use, the practical life is accurately estimated. It can be.

It is sectional drawing which shows the structural example of the water pump of both suction horizontal axis single stage as an example of the liquid pump relevant to this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the example of a structure of the horizontal axis multistage water pump as an example of the liquid pump relevant to this invention. FIG. 1 is a cross-sectional view illustrating a configuration example of a horizontal-axis mixed flow pump as an example of a liquid pump as an example of a liquid pump related to the present invention. It is a figure showing the example of composition of the lubricating oil circulation system of the liquid pump concerning the present invention. It is a conceptual diagram which shows the relationship between the years of use of the conventional apparatus and the failure rate. It is a figure for explaining the state monitoring judgment concerning the present invention. It is a figure for explaining the state monitoring judgment concerning the present invention. It is a figure for explaining the state monitoring judgment concerning the present invention. It is a figure for explaining the state monitoring judgment concerning the present invention. It is a figure for explaining the state monitoring judgment concerning the present invention. It is a figure for explaining the state monitoring judgment concerning the present invention. It is a figure for explaining the state monitoring judgment concerning the present invention. FIG. 3 is a diagram for explaining a basic concept of a scheduler according to the present invention. FIG. 3 is a diagram for explaining in detail a basic concept of a scheduler according to the present invention. FIG. 5 is a diagram showing a specific flow of an evaluation / estimation function of the scheduler according to the present invention. It is a figure for explaining the state monitoring judgment concerning the present invention. It is a figure for explaining the state monitoring judgment concerning the present invention.

  Hereinafter, embodiments of the present invention will be described. In this embodiment, a water pump that handles water is described as a liquid pump, but the liquid pump targeted by the present invention refers to a liquid pump that handles liquid similar to water.

  FIG. 6 shows the difference between the so-called water pump models and models, such as the structure and shaft type of the water pump, drainage, clean water, or river water or sea water, from the field data (past field data) obtained so far of the water pump. A certain group is classified into a plurality of groups (basic classification) based on basic matters such as handling water such as water pumps, so-called differences in use of water pumps, and differences in conditions such as user's water pump operation policies. The bearing surface temperature is represented as a mechanical state observation parameter (data), the wear powder concentration in the lubricating oil is represented as a lubricating oil property analysis parameter (data), and the time to failure (life time) is represented as 100 on the horizontal axis. The elapsed time of operation is shown as a percentage, and the vertical axis shows the temperature of the bearing in which the lubricating oil circulates (bearing temperature) and the observed value of the concentration of abrasion powder in the lubricating oil when the water pump is operating normally. Taking relative ratio to it as a reference value 1 to a diagram showing the standard state transition (graph).

  Here, the period (time) until the failure of the water pump may be a period during which the failure occurrence rate increases. The mechanical condition observation parameters and lubricating oil property analysis parameters may not be as long as the annual operating time of the pump.In some cases, it is more appropriate to consider the pump life due to other factors than bearing wear and lubricating oil properties. , And are classified into basic categories according to the handling water, the operation policy of the user, and the like. In addition to the classification conditions, the mechanical condition observation parameters and the lubricating oil property analysis parameters include the service life of the pump coating and the allowable value of corrosion that can occur in the pump due to the relationship with the quality of the handling water. It is set in consideration of.

  The graph shown in FIG. 6 is extracted from field data that did not result from deterioration of the lubricating oil in the past but caused failures due to damage to the bearing due to other factors. In the figure, the broken line A indicates the concentration of wear powder in the lubricating oil, and the solid line B indicates the bearing temperature. Data stored as field data rarely show the same aspect, and often differ according to differences in conditions such as the model, operating temperature conditions, rotation frequency, number of bearings, surface pressure, and the number of times of starting and stopping. Although the life varies depending on the degree of severity of these conditions for the operation of the pump, the transition of the strength indicated by the mechanical observation parameters and the lubricating oil property analysis parameters does not change significantly.

  By standardizing and standardizing in this way, when actually measuring the state of the pump being used during actual maintenance, from the basic classification of the pump, the mechanical state observation parameters of the pump and the analysis of the lubricating oil properties The standard state transition of the parameter is specified, and it can be seen how much the time of the actual measurement has progressed to the period up to the failure. Next, by comparing the mechanical state observation parameter (bearing temperature) obtained by actual measurement with the lubricating oil property analysis parameter (wear powder concentration in lubricating oil) and a standard state transition graph, It is possible to judge the place where the overhaul should be performed.

  Although the mechanical state observation parameter and the lubricating oil property analysis parameter slightly change in the initial operation, the state becomes stable thereafter. Therefore, the stable state is preferably set to the reference value 1. Thereafter, as the operation is continued, the value of each parameter becomes larger than 1 and becomes larger toward the terminal stage immediately before the failure.

  By the way, up to now, regular inspections of pumps in pumping / drainage facilities have been usually performed about once every six months to one year. Also, overhaul of pumps has been performed once every five to ten years. As described above, the overhaul of the pump has been carried out at a predetermined time as a preventive maintenance, but if the time is confirmed again by the graph shown in FIG. 6, it is performed at the time of 44% to 60%. There are many cases.

[No change, constant reference value 1]
FIG. 7 is a diagram illustrating a situation when the periodic inspection is performed eight times for the pumps of the classification in FIG. 6. As shown in the figure, the actual measured value of the bearing temperature (indicated by ▲) and the actual measured value of the abrasion powder concentration (indicated by x) are within the reference values in the data performed 60% of the time until the failure. Therefore, it was decided not to carry out the overhaul and to postpone the overhaul at the next 70% of the time. In FIG. 7, as in FIG. 6, the broken line A indicates the concentration of wear powder in the lubricating oil, and the solid line B indicates the bearing temperature.

  Next, since the data obtained at the time of 70% was within the reference value unlike the movement of the typical state transition graph, the disassembly inspection was not performed and the disassembly inspection was postponed until the next 80% time. I made a decision. Since the data obtained at the time of 80% was also within the reference value, it was decided to postpone it to the time of 90%. However, even if no abnormal change is observed at 90% of the time, the time of 90% of the assumed failure time has passed. In addition, based on the usage conditions, usage status, operation status, etc., this scheduler will check the simple inspection based on the results of the previous measurement and diagnosis so that the administrator may be required to reconsider the necessity of disassembly inspection. It is preferable to set a function that can indicate the location and the recommended time for the inspection to the administrator. By setting this function, the administrator can easily check the location pointed out by the scheduler with an inspection device using a fiberscope or the like, and determine whether or not the disassembly and inspection is necessary.

[Unusual below the standard value 1 and below the typical state transition graph]
FIG. 8 is a diagram showing another situation when the periodic inspection is performed eight times for the pumps of the classification in FIG. In the figure, the solid line C indicates the wear powder concentration, and the broken line D indicates the bearing temperature. As shown in the figure, both the actual measured value of the bearing temperature (indicated by ▲) and the actual measured value of the abrasion powder concentration (indicated by x) were within the reference values in the data performed 60% of the time until the failure. Therefore, it was decided not to carry out the overhaul and to postpone the overhaul at the next 70% of the time.

  Next, in the data obtained at the time of 70%, the actual measurement value of the bearing temperature (indicated by ▲) was within the reference value, but the actual measurement value of the abrasion powder concentration (indicated by x) slightly exceeded the reference value. However, since it was below the typical state transition graph, it was decided to continue operation until the next 80% of the time, and to perform overhaul at 80% of the time. In addition, the parts to be focused on at the time of disassembly and inspection will be focused on inspection of bearings related to lubricating oil. Analysis of the components of iron, copper, tin, and the amount of the resin material of the wear powder obtained at this time revealed that the proportion of iron and copper was large, so that rolling bearings using these components for the sliding surface were mainly used. Inspection and replacement were prepared as targets, and rolling bearings were replaced during 80% disassembly and inspection. The roller bearing showed slight damage due to sliding. When the ratio of tin and resin is large, it can be determined that the bearing is a plain bearing. In the operation state after the replacement of the rolling bearing, both the bearing temperature and the wear powder concentration were within the reference values. According to the data obtained at the time of 80%, the concentration of the abrasion powder is further increased, and if the operation is further continued, the pump set may need to be replaced. Could be prevented.

[Bearing temperature rise leading curve]
FIG. 9 is a diagram showing a situation where pumps of the classification shown in FIG. 6 are extracted from field data that has led to a failure due to oil deterioration in the past. Data stored as field data rarely shows the same aspect, and often differs depending on conditions such as a model, a use temperature condition, a rotation frequency, a lubricating oil replacement frequency, a lubricating oil cooling condition, and a lubricating oil amount. The service life varies depending on whether these conditions are severe for the operation of the pump, but the changes in the strength indicated by the mechanical condition observation parameter (bearing temperature) and the lubricating oil property analysis parameter (wear powder concentration). Does not change much.

  By standardizing and standardizing in this way, when actually measuring the state of the pump used at the time of maintenance, from the basic classification of the pump, the mechanical state observation parameter of the pump, the lubricating oil property analysis parameter The standard state transition is specified, and it can be understood how far the actual measurement time has progressed up to the failure period. Next, by comparing the mechanical state observation parameter (bearing temperature) obtained by actual measurement with the lubricating oil property analysis parameter (wear powder concentration in lubricating oil) and a standard state transition graph, It is possible to judge the place where the overhaul should be performed. When the amount of lubricating oil in the machine is reduced, lubricating oil is added to compensate for the shortage. However, information on the decrease and amount of lubricating oil can be taken into the scheduler, and correction can be performed accordingly.

  As the deterioration of the lubricating oil progresses, the polymerization proceeds. For this reason, as shown by the solid line C in FIG. 9, the rise in the bearing temperature is seen before the increase in the concentration of the wear powder shown by the broken line D (in FIG. 6, the rise in the bearing temperature is shown by the solid line B as shown by the broken line A). (It is seen before the increase in wear powder concentration). When the temperature of the lubricating oil rises, the oil film strength decreases, the oil film gradually breaks at the sliding portion, and the metal of the sliding portion wears. As described above, the concentration of the abrasion powder increases after the lubricating oil temperature increases.

[Variation below typical state transition graph below reference value 1]
FIG. 10 is a diagram illustrating a situation when the periodic inspection is performed eight times for the pump in FIG. 9. In FIG. 10, the bearing temperature is indicated by a solid line C, and the wear powder concentration is indicated by a broken line D. As shown in the figure, the measured value of the bearing temperature (indicated by the symbol 印) and the measured value of the concentration of the abrasion powder (indicated by the symbol x) fall within the reference value 1 in the data performed at 60% of the period up to the failure. Therefore, it was decided not to conduct overhaul and to postpone the next overhaul.

  Next, since the data obtained at the time of 70% was also within the reference value, it was determined that the overhaul was not carried out and the overhaul was postponed until the next 80%. The data obtained at the time of 80% showed that the abrasion powder concentration was within the reference value. The bearing temperature was above the reference value, but below the typical state transition graph. Since no abrasion powder was generated, the lubricating oil was changed and the decomposition point was postponed until 90%. However, even if no abnormal change is observed at 90% of the time, the time of 90% of the assumed failure time has passed. The operating state after the replacement of the lubricating oil was within the reference values for both the bearing temperature and the wear powder concentration.

[3rd curve]
FIG. 11 uses the bearing temperature (solid line G) and the abrasion powder concentration in the lubricating oil (dashed line E) as the mechanical state observation parameters and the lubricating oil property analysis parameters. F) is a mechanical observation parameter. With this parameter, the status of the contribution of the underwater bearing can be understood. Although FIG. 11 uses the vibration acceleration as a parameter, this parameter may be a vibration amplitude value or a vibration speed based on the specifications of the bearing of the pump. The parameter may be narrowed down to N and a frequency that is a multiple of the rotation speed N.

  FIG. 12 is a diagram showing a situation when the regular inspection is performed six times for the model in FIG. The actual measured value of the shaft temperature (indicated by x), the actual measured value of the abrasion powder concentration (indicated by *), and the actual measured value of vibration or speed (indicated by ●) are within the standard values until the fourth periodic inspection. I was However, during the fifth periodic inspection, the vibration acceleration slightly increased, and at the sixth time, the vibration acceleration was clearly counted. The fifth and sixth measurements of the shaft temperature and the measurement value of the abrasion powder concentration were within the standard values, so there were no abnormalities in the oil-lubricated bearings. It was thought that the underwater bearings were used.

  Therefore, the pump performance characteristics were measured, and it was confirmed that the required performance was obtained.Then, until the pumps were ready for replacement such as underwater bearings, they were asked to continue operating the pump. An overhaul was performed. The underwater bearing (slide bearing) was damaged, so it was replaced and restarted. The vibration acceleration was within the standard value.

[Maintenance scheduler]
As described above, the simple embodiment of the maintenance scheduler according to the present invention has been introduced. In short, there is one as shown in FIG. FIG. 13 shows the concept of the maintenance scheduler according to the present invention. The maintenance scheduler has the following processes and functions as a large framework.
(1) Data processing process of classification and standardization of sampling data (mechanical state observation data, that is, actual measurement data for grasping the operation state of the liquid pump to be estimated) (2) To evaluate the state of sampling data The data processing process of classifying, standardizing, and standardizing field data accumulated from the past (3) Comparing and examining each other's processed data to determine the current normal / abnormality of the liquid pump to be estimated and estimate the remaining life And a function to estimate future maintenance schedules and propose the schedule. (4) The obtained sampling data and the history of the judgment result are stored, and at the same time, the accumulated field data is updated and the evaluation criteria are set. Function to update

  FIG. 14 conceptually illustrates the functions of the maintenance scheduler in more detail based on the skeleton of the concept shown in FIG. As shown in the figure, the scheduler has the following “basic classification function”, “data standardization function”, “search function”, “contrast function”, “evaluation / estimation function”, and “history management function”. .

・ Basic classification function This function is used for processing the accumulated field data up to now, so-called pump models and model differences depending on the pump structure and shaft type, drainage water, river water and river water. Classification (basic classification) is performed based on basic matters such as differences in handling water such as seawater, so-called differences in use of the pump, and differences in conditions such as user operation policies. On the other hand, in the processing of sampling data obtained from a pump that is currently subject to maintenance, the operating conditions of the pump are classified in the same way as the basic classification of field data, and the type of basic It is specified whether it is included in the strategic classification.

-Data standardization standardization function This function is used for the basic classified data, for the field data, for the selected mechanical condition observation parameters and lubricating oil property analysis parameters, and for the model, operating temperature conditions, rotation frequency, and number of bearings. It corrects and standardizes taking into account conditions such as pressure, surface pressure, number of times of starting and stopping, number of times of lubricating oil replacement, lubricating oil cooling conditions, amount of lubricating oil, and standardizes the time until pump failure. The sampling data is also standardized and standardized similarly to the field data.

・ Search function This function searches for standardized and standardized data from field data based on the type of the basic classification from sampling data, and standardizes / standardizes from field data according to the basic classification of sampling data. It searches and provides the converted data.

・ Comparison function This function compares the standardized sampling data and field data for the selected mechanical condition observation parameters and lubricating oil property analysis parameters in the same basic classification.

-Evaluation estimation function This function compares the field data standardized and standardized by the comparison function with the sampling data, and evaluates whether the sampling data is abnormal or normal. This function estimates the location of an abnormal part, proposes when it should be dealt with, and, if normal, suggests the next maintenance target location and maintenance time.

-History management function This function is to record and save the sampling data and the evaluation / judgment / action / result at that time, and to feed it back to the field data for updating. By performing this update, standardization and standardization based on field data can be performed more enriched.

  FIG. 15 is a diagram showing a specific processing flow of the evaluation / estimation function of the maintenance scheduler. First, the evaluation / estimation function is started. In step ST1, the standardized and standardized sampling data and field data are compared, and in step ST2, the remaining life is estimated. In the following step ST3, it is determined whether or not the wear powder amount / change amount is equal to or less than the reference value. If not (No), in the following step ST4, each metal component concentration (each metal powder concentration) is equal to or less than the reference value. If it is not less than the reference value (No), in a succeeding step ST5, a damaged portion is predicted from a metal component (metal powder) detected at a concentration not less than the threshold value.

  If the wear powder amount / change amount is equal to or less than the reference value in step ST3 (Yes), it is determined in step ST6 whether the temperature is equal to or less than the reference value. If not, the lubricating oil is determined in step ST7. Propose and implement an exchange. Note that the processing of step ST7 is also performed when the respective metal component concentrations are equal to or less than the reference value (Yes) in step ST4. In step ST6, the temperature is determined to be equal to or less than the reference value. If the temperature is equal to or less than the reference value (Yes), it is determined in step ST8 whether the vibration acceleration is equal to or less than the reference value. In step ST9, investigation and replacement of the underwater bearing and the wear ring are proposed. Further, in step ST5, the damaged portion is predicted, in step ST7, lubrication oil replacement is proposed and implemented, and in step ST9, investigation and replacement of the underwater bearing and the wear ring portion are proposed. Suggestions for abnormal locations and maintenance times.

  In the above embodiment, the standardized and standardized sampling data is compared with the standardized and standardized field data, and the mechanical state observation parameters are used as bearing temperature, vibration acceleration, and lubricating oil property analysis parameters as wear powder in lubricating oil. The case where the measurement is performed as the density is illustrated. By appropriately selecting the mechanical state observation parameters and the lubricating oil property analysis parameters in this way, it is possible to propose whether or not the pump is abnormal, specify the abnormal location, and propose a maintenance response time.

  The field data used in the maintenance scheduler according to the present invention may be stored anywhere. That is, it may be stored in a storage device associated with the terminal device used in the place where the maintenance work is being performed, or may be stored in a remote storage means and may be stored in a storage place where the maintenance work is performed by communication or the like as necessary. May be used by downloading to the terminal device. The field data contains information on pumps that have multiple sliding parts with different usage environments and roles, and includes information on pump models, submersible bearings in pumps, shaft seals, thrust in lubricating oil, radial bearings, etc. The information on the type of moving part and the information on the number thereof are included. Also, information on the cause and location of the failure of each pump is included.

  The maintenance scheduler according to the present invention has a classifying means for classifying field data, and the basic data classifying function has the field data, so-called pump model and type difference such as pump structure and shaft type, drainage, It includes information such as differences in the so-called use of the pump due to differences in the handling water such as tap water or river water or seawater, and further differences in conditions such as user operation policies and the like, and is classified according to them.

  In addition, the classifying means can be used to classify the field data into, for example, a case in which the failure was not caused by the deterioration of the lubricating oil in the past, but the failure was caused by damage to the bearing from other factors, or a failure was caused by the deterioration of the lubricating oil in the past. It is also possible to perform grouping according to the cause of failure, such as when the error has occurred. By performing classification by the basic classification function and grouping by cause of failure, it is possible to extract field data in a range closer to the actual maintenance target pump from the field data.

  The maintenance scheduler according to the present invention includes parameter selection means. Specifically, some parameters can be selected by the parameter selecting means from a plurality of state parameters representing the state of the pump included in the field data. Depending on the selected parameter, for example, a mechanical state observation parameter and a lubricating oil property analysis parameter are selected, and from the start of operation to the failure, the tendency of data transition from normal value to abnormal value of each parameter is mechanically changed. The field data is divided into two groups depending on which of the state observation parameter and the lubricant property analysis parameter is earlier. The data where the former parameter occurs first is not due to the deterioration of the past lubricating oil, but is included in the group that led to failure due to bearing damage from other factors, and the data where the latter parameter occurs first is not This is useful for a classification function such as including in a group in which failure has occurred in the past due to deterioration of lubricating oil.

  The maintenance scheduler according to the present invention includes standardization / standardization means. The standardization / standardization means has a field data / sampling data standardization / standardization function.For example, this function is not a cause of deterioration of the lubricating oil in the past. For the group of field data extracted by accumulating the collected data, the information included in the field data, such as the model, operating temperature condition, rotation frequency, number of bearings and surface pressure, number of start / stop times, depends on the difference between those conditions. Since the length of the time axis, the output value of the parameter depending on the temperature, and the like are different, the data are normalized or weighted, for example, assuming that the period until the pump failure is 100 and the reference value of each parameter is 1. Then, a state transition graph based on standardized and standardized data can be obtained.

  Similarly, for the field data group extracted by accumulating data that led to failure due to deterioration of the lubricating oil in the past, the model included in the field data, operating temperature conditions, rotation frequency, number of lubricant changes The information on the lubricating oil cooling conditions and the amount of lubricating oil has different conditions, but the length of the time axis and the output value of the parameter depending on the temperature are different. By standardizing or weighting the period as 100 and the reference value of each parameter as 1, a state transition graph of the liquid pump can be obtained from the standardized and standardized data.

  As the mechanical state observation parameters, at least temperature measurement data of the thrust bearing and the radial bearing in the lubricating oil are preferable as parameters that can grasp the situation, and as the lubricating oil property analysis parameters, the wear powder concentration during lubrication, the amount of metal component, The particle size distribution, contamination degree, and color of the wear powder are selected. The temperature is selected from the temperature of the lubricating oil, particularly the temperature of the thrust bearing and the radial bearing, the viscosity of the lubricating oil, the moisture concentration of the lubricating oil, and the acid value and color of the lubricating oil. Further, a state transition graph is prepared for a parameter indicating the overall state of the pump as a mechanical state observation parameter. Vibration displacement, vibration speed, vibration acceleration, and the like are selected as such parameters. That is, these indices are preferably included in the field data, and are preferably sampled to be sampled data. Note that, when obtaining sampling data, measurement equipment required for observing these parameters may be measured with existing known equipment.

  Next, the maintenance scheduler according to the present invention includes input means for inputting at least data of the selected mechanical state observation parameter and the lubricating oil property analysis parameter which are observed by the actual machine at the time of the periodic inspection. And comparing and judging which of the two types of state transition graphs are different from each other based on the measured values of the mechanical state observation parameters and the lubricating oil property analysis parameters. ing.

  Further, the maintenance scheduler according to the present invention includes operating condition input means for inputting operating conditions such as the model of the actual machine, the operating time, the operating temperature condition, the rotation frequency, the number of bearings and the surface pressure, the number of times of starting and stopping, and the like. Estimated life calculation means for estimating, based on these conditions, how long the elapsed time from the time of the regular inspection of the actual machine to the life (failure stop) assumed in the state transition graph is estimated. Is provided. For the estimated life calculation, a calculation that obtains a state transition graph from the above-described field data is basically used.

  Similarly, the maintenance scheduler according to the present invention includes the model of the actual machine, the characteristics of the lubricating oil used, the operating temperature conditions, the rotation frequency, the number of times of lubricating oil replacement, the lubricating oil cooling conditions, and the lubricating oil usage conditions such as the lubricating oil amount. Lubricating oil use condition input means is provided for inputting the conditions. The estimated life calculation means also calculates how long the elapsed time until the periodic inspection of the actual machine depends on the expected life (failure stop) in the state transition graph. Used to estimate if you are at a temporal location. The comparison judgment means and the estimated life calculation means basically determine the timing and contents of the next maintenance, that is, the normal inspection or the overhaul. The maintenance scheduler according to the present invention is provided with a maintenance schedule determining means for determining the time and contents of the next maintenance by the comparison determining means and the estimated life calculating means.

  Periodic inspection of pumps in pumping / drainage facilities is usually performed about once every six months to once a year. Data collection of each parameter of the actual machine is performed at each periodic inspection, and may be input to the input means of the maintenance scheduler manually by a staff member, or the selected mechanical condition observation parameters and lubricating oil property analysis parameters may be input. The measuring device to be measured may be provided in the actual device, and the measuring device may constantly measure and input the data online to the maintenance scheduler.

  In the maintenance scheduler according to the present invention, at least two types of state transition graphs are compared by the above-mentioned comparison judgment means from each observation value of the mechanical state observation parameters and the lubricating oil property analysis parameters observed and input by the actual machine. An abnormal location estimating means for judging which parameter is ahead of the other and further estimating an abnormal location is provided.

  For example, when the concentration of wear powder in lubricating oil is used as a lubricant property analysis parameter, if an increase in the concentration of wear powder in lubricating oil is first seen, thrust bearings and radial bearings due to oil lubrication may be damaged. Suspected to have occurred. Alternatively, the temperature of the bearing is selected as a parameter for observing the mechanical state, and if the increase is first seen, deterioration of the lubricating oil is suspected. If another vibration acceleration is selected as the mechanical state observation parameter, and the vibration acceleration increases even though the wear powder concentration and the bearing temperature are within the reference values, the thrust bearing with lubricating oil and the radial Both damage to the bearing and deterioration of the lubricating oil are unlikely. Therefore, there is a high possibility that other sliding parts, particularly sliding parts in water, may be damaged. Conversely, when the wear powder concentration and the bearing temperature increase and the vibration acceleration increases, it is suspected that the thrust bearing and the radial bearing are damaged by the lubricating oil.

  As described above, the comparison and judgment means described above compares at least two types of state transition graphs based on the mechanical state observation parameters observed and input with the actual machine and the respective observation values of the lubricating oil property analysis parameters. By judging whether or not the abnormality is ahead, the location of the abnormality is estimated.

  The maintenance scheduler according to the present invention further includes an urgency determination unit that determines the urgency of the measure with respect to the determination result of the comparison determination unit. That is, even if the emergency stop switch provided in the pump device is not operated, for example, when the observed value of the wear powder concentration or the bearing temperature greatly deviates from the reference value, a warning is issued to a staff or an administrator. It will notify as soon as possible and propose a suspension. As a condition for giving an alarm, a threshold value is set for the degree of the concentration of abrasion powder, and an alarm is issued when the observed value is equal to or larger than the threshold value.

  A specific example of performing the above alarm will be described with reference to FIG. Here, the relative ratio “2” is set as the threshold. Thereby, when the relative ratio of the concentration of the abrasion powder is “L” higher than the threshold value “2”, a warning is transmitted to a staff member or a manager.

  Incidentally, the observed value may be larger than the reference value “1” and less than the threshold value “2”, for example, as in “M” and “M ′” in FIG. In such a case, there are “M” that is larger than the value of the state transition graph (wear powder concentration I) and “M ′” that is smaller than that.

  If the value is larger than the reference value “1” and less than the threshold “2”, and if “M ′” is equal to or less than the value of a typical state transition graph (wear powder concentration I), the state is better than the state transition. It can be determined that the life can be extended by the difference “b” on the time axis with the state transition graph. The estimated life calculation means may calculate the life longer by that amount and report it to a staff member or a manager.

  However, when the value is larger than the reference value “1” and less than the threshold value “2” and “M” is larger than the value of the state transition graph, is the state worsening like “c” (the threshold value “2”)? ) Or is maintained like “d” (levels off without approaching threshold “2” or reference value “1”) or recovers by a temporary phenomenon like “e” (Returning to the reference value “1” again) must be checked on the time axis. Therefore, the maintenance scheduler according to the present invention sends a notification requesting a staff member or an administrator to measure a temporal change of each parameter. However, notification is not necessarily required when the information is input online.

  In this way, the maintenance scheduler obtains the time gradient of the parameter observed in the range larger than the reference value “1” and less than the threshold “2”, and the state is changed as shown in “c”. If it is determined that it will worsen thereafter (approaching the threshold “2”), inform the staff or the manager how long the threshold “2” will be exceeded.

  On the other hand, when it is seen that it is maintained in that state as shown in “d” (levels without approaching the threshold value and the reference value), or it recovers by a temporary phenomenon as in “e” (again, the reference value If it is determined to return to "1", the normal inspection is continued as it is. However, if it is seen that the state is “d” (leveling without approaching the threshold value “2” or the reference value “1”), the Y-axis (vertical axis) of a typical state transition graph is indicated by a dotted line f. , The timing of approaching the threshold “2” is advanced as indicated by “i”. On the other hand, in the case of “e” which is expected to recover by a temporary phenomenon (return to the reference value “1” again), it may be considered as a typical state transition graph as in the past. As described above, the estimated lifetime means estimates the subsequent lifetime based on the situation of the abnormal situation.

  Thus, even in the case of a water pump having a plurality of sliding parts having different usage environments and roles (water pumps as shown in FIGS. 1 to 3), a typical failure occurs with respect to specific parameters. By comparing the graphs up to the actual data, it is possible to estimate the location of damage, and to propose the next maintenance schedule and the degree of urgency and preparation period for abnormalities.

  The measurement parameters for periodic inspections and the like include mechanical state observation parameters and lubricating oil property analysis parameters, but other pump equipment temperatures, current values and torques of drive units, abnormal noise conditions, shaft seals, etc. It is also possible to measure histories such as leaks of parts, pump performance status, start / stop frequency and number, etc., and further perform abnormality confirmation, life prediction, and maintenance timing proposal.

  By the way, when sampling data from a pump to be maintained, it is desirable that the measuring equipment, the measuring method, and the measuring means be as similar as possible. However, with respect to measuring instruments, new ones appear as the date progresses, and it is common to evaluate the transition of pump measurement data from the past using the old measuring instruments as they are. Therefore, it is desirable that the information of the measuring device, the measuring method, and the measuring means be included in the sampling data measurement and the field data.

  For example, the concentration of abrasion powder in the lubricating oil varies depending on whether it is in a stirred state or not, and whether the lubricating oil was collected when the pump was running or when it was stopped. Further, it is desirable to include information of the lubricating oil sampling position as information to be taken into sampling data and field data. By classifying such information by the measuring device, the measuring method, and the measuring means by the classifying function, it is possible to perform more accurate diagnosis and schedule setting.

  In addition, for example, the occurrence of an abnormality and the identification of an abnormal location can be easily performed by making the following modifications on the device side such as a pump and a sliding portion.

  FIG. 17 is a diagram showing a schematic configuration of a radial bearing unit used in lubricating oil. The radial bearing unit 20 includes a radial bearing 21, and the radial bearing 21 includes a bearing holder 22 and a slide bearing 23 held by the bearing holder 22.

  In the radial bearing unit 20 shown in FIG. 17A, a specific member 22a made of a material having a special composition or a fluorescent material capable of specifying this part is mounted on a part of the bearing holder 22 close to the shaft 10. The clearance between the material of this special composition or the fluorescent material 22a and the shaft 10 was defined as a clearance Δa, and the clearance Δa was defined as an allowable expansion range due to wear of the inner diameter of the slide bearing 23. As a result, when the sliding bearing 23 wears out beyond the allowable expansion range, the shaft 10 whirls so that the shaft 10 hits the specific member 22a, and a material having a special composition or a fluorescent material that constitutes the specific member 22a is worn away. Is included in the lubricating oil. If a material having a special composition or a fluorescent material can be measured when measuring the wear powder in the lubricating oil, the service limit of the plain bearing 23 can be easily grasped.

  In the radial bearing unit 20 shown in FIG. 17B, the bushes 24a and 24b are arranged not at the bearing holder 22 but at positions close to the bearing holder 22 with different clearances Δb and Δc between the shaft 10 and the shaft. Things. The bushes 24a and 24b are fixed and do not rotate, and a material having a special composition or a fluorescent material capable of identifying the bushes 24a and 24b is attached to a portion of the bushes 24a and 24b where the shaft 10 approaches. When a special material or fluorescent material of the bush 24a with a small clearance Δb is detected in the lubricating oil, a preliminary alarm recommending replacement of the sliding bearing 23 is generated, and a special material of the bush 24b with a large clearance Δc is detected. When the fluorescent material is detected, an alarm for notifying the service limit of the sliding bearing 23 is generated.

  If a fluorescent material is used as a material to be mounted on the specific member 22a or the bushings 24a and 24b, it reacts with a black light or the like, so that the wear state of the sliding bearing 23 can be easily grasped without using a precise component measuring device. .

  In addition, it is time-consuming to collect lubricating oil for each inspection and send it to an analytical company each time for analysis. In the normal inspection, the lubricating oil may be collected when the color of the lubricating oil viewed from the sight glass approaches a specified value. Alternatively, instead of the sight glass, a detection pipe and a detection rod leading to the lubricating oil storage tank may be provided, and the color of the lubricating oil attached to the detection rod may be viewed.

  The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications may be made within the scope of the claims and the technical idea described in the specification and the drawings. Is possible. It should be noted that any shape or structure not directly described in the specification and drawings is within the technical scope of the present invention as long as the effects of the present invention are achieved.

Reference Signs List 20 radial bearing unit 21 radial bearing 22 bearing holder 22a specific member 23 sliding bearing 24a bush 24b bush 100 water pump 101 rotating shaft 102 impeller 103 suction port 104 discharge port 105 pump casing 108 shaft sealing device 109 bearing device 121 lubricating oil pump 123 Lubricating oil cooler 124 Filter 126 Forced lubricating device 200 Water pump 201 Rotary shaft 202 Impeller 203 Suction port 204 Discharge port 205 Pump casing 206 Wear ring 207 Balance device 208 Shaft sealing device 209 Bearing device 210 Lubricating oil storage tank 227 Cooling jacket 300 Water Pump 301 Rotating shaft 302 Impeller 305 Pump casing 309 Bearing device 310 Lubricating oil storage tank 311 Underwater bearing 312 Drain port 314 Equipment mounting port 316 Guide vane 318 Inner cylinder

Claims (11)

It is a maintenance scheduler of the liquid pump, which observes an operation state of the liquid pump having a plurality of sliding parts, and estimates and proposes a maintenance schedule of the liquid pump,
Equipped with classification function, standardization standardization function, search function, comparison function, evaluation estimation function, and history management function,
The classification function is based on the accumulated field data of the liquid pump and the operation status observation data of the estimated liquid pump for estimating the maintenance schedule, at least depending on the model, model, and intended use of the liquid pump. Is a basic classification function that classifies
The normalization function is an operation elapsed time of the liquid pump such that the field data classified into a plurality of groups by the basic classification function can be appropriately compared and estimated by the comparison function and the evaluation estimation function for each group. Data, the operation status observation data and the lubricating oil property observation data are standardized and standardized, and the operation elapsed time of the estimated liquid pump, the operation status observation data and the lubricating oil property observation data are standardized and standardized.
The search function is a function of searching for field data of a group corresponding to the estimated liquid pump from field data classified into the plurality of groups,
The comparison function is a function of comparing each of the standardized and standardized data of the estimated liquid pump and each of the field data searched and standardized and standardized data,
The evaluation estimation function is a function of evaluating whether there is an abnormality in the operation state observation data of the liquid pump to be estimated from the comparison result compared in the comparison function, and estimating the abnormal part if there is an abnormality,
The history management function records and saves at least the comparison result in the comparison function and the evaluation result and the estimation result in the evaluation estimation function, and feeds it back to the field data, and updates the field data as necessary. A maintenance scheduler for a liquid pump. The function of standardizing and standardizing the operation elapsed time of the liquid pump is a function of converting the operation elapsed time into a ratio of a life time until a failure of the liquid pump,
The function of standardizing and standardizing the operation status observation data of the liquid pump is a function of converting the observation value of the operation status observation data of the liquid pump into a multiple of the observation value of the liquid pump under normal conditions. The maintenance scheduler for a liquid pump according to claim 1.   The classification function includes, in addition to the basic classification function, an operation policy classification function of classifying the field data and the sampling data from the estimated liquid pump into groups according to a difference in the operation policy of the liquid pump of the user. The maintenance scheduler for a liquid pump according to claim 1, wherein the maintenance scheduler comprises:   The classification function has a classification function according to a failure cause that classifies the field data and the sampling data from the estimated liquid pump into groups according to a failure cause, in addition to the basic category function. The maintenance scheduler for a liquid pump according to any one of claims 1 to 3.   The mechanical state observation data is the temperature of the bearing lubricated by the estimated liquid pump lubricating oil, and the lubricating oil property analysis data is the concentration of abrasion powder in the lubricating oil that lubricates the estimated liquid bearing. The maintenance scheduler for a liquid pump according to claim 1, wherein the maintenance scheduler comprises:   The mechanical state observation data and the lubricating oil property observation data included in the field data are selected, and the tendency of each monitoring data to change from a normal value to abnormal from the start of operation of the liquid pump to the failure is the mechanical characteristic. The field data is divided into two groups depending on which one of the state observation data and the lubricating oil property observation data comes first, and the group in which abnormality occurs first is not caused by deterioration of the past lubricating oil, but is caused by other factors. The classification function according to claim 1, further comprising a grouping function that includes a group in which a failure has occurred due to damage, and includes a group in which abnormality occurs later in a group that has led to a failure due to deterioration of the lubricating oil. Liquid pump maintenance scheduler.   The liquid pump according to any one of claims 1 to 6, wherein the evaluation estimating function further includes a function of proposing a maintenance schedule for determining a next maintenance time and a content of the maintenance. Maintenance scheduler.   The maintenance scheduler of a liquid pump according to claim 7, wherein the mechanical state observation data is a vibration acceleration, a vibration amplitude value, a vibration speed, a rotation speed N, or a multiple of the rotation speed N of the liquid pump.   By the comparing function and the evaluation estimating function, the state transition between the value of the mechanical state observation data and the value of the lubricating oil property analysis data of the estimated liquid pump is compared, and it is determined which of the abnormalities precedes. 2. The maintenance scheduler for a liquid pump according to claim 1, wherein the abnormal point of the estimated liquid pump is estimated.   The maintenance and maintenance of a liquid pump according to claim 9, wherein the evaluation estimating function includes an urgency determining function for determining an urgency with respect to the abnormality at the abnormal location, and issues an alarm when the emergency is determined. Scheduler. The mechanical state observation data is the bearing temperature at which the lubricating oil of the estimated liquid pump is lubricated, and the lubricating oil property analysis data is the wear powder concentration in the lubricating oil circulating through the estimated liquid pump bearing,
The horizontal axis indicates the elapsed operating time of the liquid pump as a percentage of the life time, and the vertical axis indicates the bearing temperature and the abrasion powder concentration of the liquid pump. Create a graph showing the relative ratio,
The graph is used to set the bearing temperature and the normal level of the abrasion powder concentration when the estimated liquid pump is in a normal operation by the relative ratio, and to set the threshold level when the bearing temperature and the abrasion powder concentration become abnormal. Set by relative ratio,
When the bearing temperature or wear powder concentration of the estimated liquid pump exceeds the threshold level, an alarm is issued to that effect, and the bearing temperature or the wear powder concentration in the lubricating oil is between the normal line and the threshold line. Waits for a predetermined elapsed operating time, observes the bearing temperature and the wear powder concentration in the lubricating oil during that time, and determines whether the bearing temperature or the wear powder concentration in the lubricating oil is increasing toward the threshold level, the bearing temperature or 3. The apparatus according to claim 2, further comprising a function of determining whether there is no change in the concentration of the wear powder in the lubricating oil or a decrease toward the normal level, and a function of notifying the user of the determination. 4. Liquid pump maintenance scheduler.

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