KR101473237B1 - Booster pump bearing replacement cycle detection device - Google Patents

Booster pump bearing replacement cycle detection device Download PDF

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Publication number
KR101473237B1
KR101473237B1 KR1020140102390A KR20140102390A KR101473237B1 KR 101473237 B1 KR101473237 B1 KR 101473237B1 KR 1020140102390 A KR1020140102390 A KR 1020140102390A KR 20140102390 A KR20140102390 A KR 20140102390A KR 101473237 B1 KR101473237 B1 KR 101473237B1
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South Korea
Prior art keywords
bearing
phase
life
booster pump
unit
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KR1020140102390A
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Korean (ko)
Inventor
조민태
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주식회사 두크
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0077—Safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0088—Testing machines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/086—Sealings especially adapted for liquid pumps
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G01M13/04—Bearings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/40—Investigating fluid-tightness of structures by using electric means, e.g. by observing electric discharges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2210/00—Working fluids
    • F05D2210/10—Kind or type
    • F05D2210/11—Kind or type liquid, i.e. incompressible
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps

Abstract

The present invention relates to a replacement cycle detecting device of a booster pump bearing and a mechanical seal. A booster pump system comprises: one or more booster pumps connected to a three phase input power line; a discrete inverter installed in the booster pump which is controlled by a control unit; a gate valve installed between an intake unit and an intake tube of the booster pump; a backflow prevention check valve installed with the gate valve in series between a discharge unit and a discharge tube of the booster pump; and a discharge unit pressure sensor installed between the discharge tube and an input terminal of the discrete inverter to control the number of rotations of a booster pump driving motor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a booster pump bearing replacement cycle detection device,

More particularly, the present invention relates to a booster pump system for boosting booster pumps, and more particularly, to a booster pump system for boosting booster pumps, By predicting the replacement time of the bearings and mechanical seal installed in the booster pump and informing the manager of the replacement time, the reliability of the booster pump system for building pressurization is increased and the life cycle cost is reduced The present invention has been achieved.

Generally, a booster pump system for building pressurization is a water supply system of a building such as an apartment or a high-rise building, in which a single pump is installed and a booster pump system in which a single pump is connected in parallel.

The water supply pump system is mainly composed of a multi-stage pump and controls the discharge pressure constantly according to the required flow rate of the customer.

In order to control the discharge pressure of the pump according to the flow rate to be used, an inverter is individually installed and controlled in the pump. The booster pump system is constituted by connecting pumps having individual inverters in parallel.

In a booster pump system with individual inverters, the inverter consists of a power section and a control section. The power section includes a rectifying section for converting an input AC voltage to a DC voltage, a smoothing DC link capacitor for smoothing the DC voltage with ripple, And an inverter unit for converting the AC power into a variable frequency-variable voltage AC power.

The control unit provided in the individual booster pump has a function of controlling the inverter that transmits the necessary power to the motor (motor) that drives the pump. In the control unit, the used power is calculated from the voltage and current value transmitted to the motor through the inverter, The accumulated power value can be calculated and stored.

The use time of the motor can be estimated from the accumulated value of the electric power supplied to the motor, and the use time of the pump can also be estimated together.

At this time, the booster pump, which is mainly used for water supply, can be divided into a rotating part and a fixed part, and a bearing is used to smoothly connect the rotating part of the motor and the fixed part. In order to prevent leakage, Install a mechanical seal at the junction of the rotating part and the fixing part.

On the other hand, the portion where the failure occurs during prolonged use of the pump is mostly generated in bearings and mechanical chambers that connect the fixed portion and the rotating portion of the motor and the pump main body.

In the case of bearings, the ball between the inner ring and the outer ring receives the high contact pressure repeatedly due to the load of the motor, the load of the pump, and the pump due to the positive function of the pump.

When it is used for a long period of time, fatigue phenomenon occurs in the bearing structure and friction and abrasion occurs at the contact portion, resulting in damage exceeding the allowable strength of the material.

The service life of these bearings varies depending on the conditions of use and environment. It can also be caused by misalignment of the rotating shaft, improper fitting, unexpected external impact, etc. In such a case, It suddenly decreases or instantly breaks down.

However, the pump system supplied to the customer after proper testing is operated by normal rotation, the service life is gradually reduced according to the use time, and after the life time provided by the bearing or the motor maker is reached, the pump system is burned.

The service life of normally used bearings can be predicted theoretically by the following equations (1) and (2).

For ball bearings

Figure 112014075255812-pat00001
--- Equation (1)

For roller bearings

Figure 112014075255812-pat00002
--- (2)

here,

Figure 112014075255812-pat00003
= Rated fatigue life (h), n = rotational speed (rpm), C = basic dynamic load rating (N), and P = bearing equivalent load (N).

In the case of a pump, it is difficult to calculate the total usage time because the pump usage time varies according to the flow rate used in the installed customer, but the total usage time can be estimated using the integrated power value provided by the individual inverter system.

In addition, the mechanical seal is not worn directly by the minute leakage of both liquids, which are pumped by the pump, on two friction surfaces, and the time during which the pump slides and gradually wears appears as a steady-state service life.

The amount of wear due to internal pressure is indicated by the manufacturer's guarantee value. If the limit wear amount is exceeded, the damage may be seriously damaged and the life of the pump can be prolonged by replacing before exceeding the limit value.

In many cases, the worn amount of chemical yarn shall not exceed 0.02 mm when used for 100 hours in fresh water.

Therefore, the life span can be estimated by determining the maximum allowable wear limit to the usable range and estimating the use time or the total number of revolutions from the accumulated power using the pump.

When 8,000 hours is assumed to be the standard stable life (8,000 hours / 100 hours) * 0.02 mm = 1.6 mm, it can be judged as the maximum replacement time when it is worn down to 1.6 mm.

However, in the conventional booster pump system for building pressurization, there is no method of detecting or indicating the replacement cycle of the bearings and mechanical chambers of the booster pump, and the bearing or mechanical seal is damaged due to the above- There is a problem that the booster pump itself becomes inoperable or is damaged and excessively consumes energy.

Korean Registered Patent No. 10-0715252 (April 30, 2007) Korean Patent Registration No. 10-0861579 (September 26, 2008) Japanese Patent Application Laid-Open No. 6-129937 (May 13, 1994) Korean Registered Patent No. 10-0485415 (April 18, 2005)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a booster pump system, Predict the remaining replacement time of the bearings and mechanical chambers installed in the pump. If the replacement time is reached, the manager will be notified automatically, or alarm will be provided through the alarm and display to increase the reliability of the booster pump system for building pressurization. Booster pump that can significantly reduce cost and damage bearing or mechanical seal, preventing pump from becoming inoperable or damaged and over-consuming energy. Replacement cycle detection of bearings and mechanical seal The purpose of the device is to provide.

According to an aspect of the present invention, there is provided a booster pump including one or more booster pumps connected to a three-phase input power line, and a booster pump, the driving of which is controlled by a control unit, And a gate valve and a check valve for preventing backflow are installed in series between the discharge section of the booster pump and the discharge tube and between the discharge tube and the input terminal of the individual inverter, In the booster pump system in which the discharging portion pressure sensor for controlling the number of revolutions of the motor is installed, in constructing the replacement period detecting device for the booster pump bearing and the mechanical seal,

A rectifying unit that receives the AC power from the three-phase input power supply line and rectifies the individual inverter to a DC voltage, and a control unit that receives a control signal input from the PWM generating unit and converts the smoothed DC voltage by a smoothing DC link capacitor to a variable frequency - a power integrated module (PIM) consisting of an inverter section for converting into a three-phase alternating voltage of variable voltage; A smoothing DC link capacitor for smoothing a DC voltage rectified by the rectifying unit; A DC voltage smoothed by the smoothing DC link capacitor

Figure 112014104659082-pat00004
); The three-phase alternating current (< RTI ID = 0.0 >
Figure 112014104659082-pat00005
A plurality of current sensors for detecting the currents; The three-phase current information detected by the current sensors
Figure 112014104659082-pat00006
) To the two-phase current information (
Figure 112014104659082-pat00007
Phase-to-two-phase conversion unit for converting the three-phase to two-phase; The command rotation speed of the booster pump output from the control unit
Figure 112014104659082-pat00008
) Is divided by the frequency and the output voltage of the inverter module (
Figure 112014104659082-pat00009
/ RTI > The output voltage of the inverter module determined by the V / f controller (
Figure 112014104659082-pat00010
A PWM generator for generating a PWM (Pulse Width Modulation) signal for controlling the inverter unit using the PWM signal; An output voltage (Vout) output from the V / f controller
Figure 112014104659082-pat00011
) Output power (
Figure 112014104659082-pat00012
Phase current information obtained from the 3-phase to 2-phase conversion unit
Figure 112014104659082-pat00013
) To calculate the accumulated power (< RTI ID = 0.0 >
Figure 112014104659082-pat00014
; kWh) using a predetermined calculation formula; The integrated electric power of the pump calculated by the integrated electric power calculation unit (
Figure 112014104659082-pat00015
; kWh) and the rated fatigue life of the bearing
Figure 112014104659082-pat00016
; h) and motor-dependent power factor (
Figure 112014104659082-pat00017
; kW), the residual life of the bearing
Figure 112014104659082-pat00018
; a bearing replacement determination unit operable to calculate a difference h; The integrated electric power of the pump calculated by the integrated electric power calculation unit (
Figure 112014104659082-pat00019
; kWh) and the maximum allowable life of the seal provided by the control (
Figure 112014104659082-pat00020
; h) and the required power factor of the seal (
Figure 112014104659082-pat00021
; kW), the residual life of the chemical yarn
Figure 112014104659082-pat00022
; and a mechanical seal replacement discriminating unit for calculating a mechanical seal replacement discriminating unit.

At this time, the three-phase current information (

Figure 112014104659082-pat00023
) To two-phase current information (
Figure 112014104659082-pat00024
) Is characterized by the following equation (3).

Figure 112014104659082-pat00172
- (3)

Also, the output power calculated by the integrated power calculation unit (

Figure 112014075255812-pat00026
) Is given by the following equation (4), and the integrated power (
Figure 112014075255812-pat00027
; kWh) is characterized by the following equation (5).

Figure 112014075255812-pat00028
------ Equation (4)

Figure 112014104659082-pat00173
--------- (5)

On the other hand, in the bearing replacement determination section,

Figure 112014075255812-pat00030
; kWh) and the rated fatigue life of the bearing
Figure 112014075255812-pat00031
; h) and motor-dependent power factor (
Figure 112014075255812-pat00032
; kW) of the bearing life
Figure 112014075255812-pat00033
; h) The equation is characterized by the following equation (6).

Figure 112014075255812-pat00034
- (6)

Further, in the above-described mechanical seal replacement determination section,

Figure 112014075255812-pat00035
; kWh) and the maximum allowable life of the seal provided by the control (
Figure 112014075255812-pat00036
; h) and the required power factor of the seal (
Figure 112014075255812-pat00037
; kW) of the residual mechanical life of the chemical yarn
Figure 112014075255812-pat00038
; h) The equation is characterized by the following equation (7).

Figure 112014075255812-pat00039
------ Equation (7)

Also, in the control unit, the remaining service life of the bearing provided by the bearing replacement determination unit

Figure 112014075255812-pat00040
; h) The minimum life span provided by the manufacturer of this motor or bearing (
Figure 112014075255812-pat00041
), The remaining life of the bearing (
Figure 112014075255812-pat00042
h) this minimum marginal lifetime (
Figure 112014075255812-pat00043
), A bearing replacement alarm is transmitted to the manager via the communication network or an alarm signal is generated through the display unit or the alarm.

In the control unit, the remaining life of the mechanical seal provided by the mechanical seal replacement discriminating unit

Figure 112014075255812-pat00044
; h) and the minimum life span provided by the manufacturer of the mechanical seal (
Figure 112014075255812-pat00045
) To compare the residual life of the mechanical seal (
Figure 112014075255812-pat00046
; h) This minimum marginal lifetime (
Figure 112014075255812-pat00047
), It is characterized in that an alarm signal is generated by transmitting a mechanical seal replacement alarm to a manager via a communication network or through a display unit or an alarm.

As described above, according to the booster pump bearing system of the present invention, in the booster pump system for building pressurization, the booster pump system for building pressurization, The power value is used to predict the remaining replacement time of the bearings and mechanical chambers installed in each booster pump. When the replacement time comes, the manager is notified automatically or the alarm is displayed through the alarm and display unit. Not only can the booster pump system for building pressurization be improved, but also the reliability of the booster pump system for building can be improved, and the product cycle cost can be drastically reduced. Moreover, the bearing or the mechanical seal can be damaged, It is possible to prevent the state of excessive consumption, And the width can be increased.

1 is a block diagram of an apparatus according to the present invention;
FIG. 2 is a flow chart for explaining a process of determining a replacement time of a bearing and a mechanical seal in the control unit of the present invention and generating an alarm. FIG.

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

FIG. 1 is a block diagram showing the apparatus of the present invention. FIG. 2 is a flow chart for explaining a process of determining a replacement time of a bearing and a mechanical seal in a control unit and generating an alarm will be.

According to the present invention, as shown in FIG. 1,

One or a plurality of booster pumps 6 are connected to the three-phase input power supply line 1 and the booster pump 6 whose drive is controlled by the control unit 8 is provided with an individual inverter 2, A gate valve 5-2 is provided between the suction portion of the pump 6 and the suction pipe and a gate valve 5-1 and a check valve 4 for preventing the backflow are provided between the discharge portion of the booster pump 6 and the discharge pipe. A booster pump system in which a discharge portion pressure sensor 3 for controlling the number of revolutions of the booster pump drive motor 6 is provided between the discharge pipe and the input terminal of the individual inverter 2, In constructing the replacement cycle detection device of the pump bearings and the mechanical seal,

The individual inverter (2)

A rectifying unit 2-1-1 for rectifying the AC power supplied through the three-phase input power line 1 to a DC voltage, and a rectifying unit 2-1-1 for receiving a control signal input from the PWM generating unit 2-6, A power integrated module (PIM) 2-1 composed of an inverter unit 2-1-2 for converting a DC voltage smoothed by the capacitor 2-2 into a three-phase alternating voltage of a variable frequency-variable voltage, ;

A smoothing DC link capacitor 2-2 for smoothing the DC voltage rectified by the rectifying unit 2-1-1;

The smoothed direct current voltage (?) Is smoothed by the smoothing DC link capacitor (2-2)

Figure 112014075255812-pat00048
A voltage sensor (2-4) for detecting a voltage of the battery;

The three-phase alternating current (2-1-2) output from the inverter section (2-1-2) in the PIM

Figure 112014075255812-pat00049
A plurality of current sensors (2-3) for detecting the currents;

The three-phase current information (?) Detected by the current sensors (2-3)

Figure 112014104659082-pat00050
) To the two-phase current information (
Figure 112014104659082-pat00051
Phase-to-2-phase conversion unit (2-7) for converting the three-phase to two-phase signal;

The command rotation speed of the booster pump output from the control unit 8

Figure 112014075255812-pat00052
) Is divided by the frequency and the output voltage of the inverter module (
Figure 112014075255812-pat00053
A V / f controller 2-5 for calculating a V / f ratio;

The output voltage of the inverter module determined by the V / f controller (2-5)

Figure 112014075255812-pat00054
A PWM generator 2 - 6 for generating a PWM necessary to control the inverter unit 2 - 1 - 2 by using the inverter 2 - 2 - 2;

The output voltage (?) Output from the V / f controller (2-5)

Figure 112014104659082-pat00055
) Output power (
Figure 112014104659082-pat00056
Phase current information obtained from the 3-phase to 2-phase converter (2-7)
Figure 112014104659082-pat00057
) Of the booster pump 7 is used to calculate the accumulated electric power (
Figure 112014104659082-pat00058
; kWh) by using a predetermined calculation formula;

The integrated electric power of the pump calculated by the integrated electric power calculation unit 2-8

Figure 112014075255812-pat00059
; kWh), the rated fatigue life of the bearing provided by the control unit 8 (
Figure 112014075255812-pat00060
; h) and motor-dependent power factor (
Figure 112014075255812-pat00061
; kW), the residual life of the bearing
Figure 112014075255812-pat00062
; a bearing replacement determination unit (2-9) for calculating a bearing rotation angle (h);

The integrated electric power of the pump calculated by the integrated electric power calculation unit 2-8

Figure 112014075255812-pat00063
; kWh) and the maximum allowable life of the seal provided by the control unit 8 (
Figure 112014075255812-pat00064
; h) and the required power factor of the seal (
Figure 112014075255812-pat00065
; kW), the residual life of the chemical yarn
Figure 112014075255812-pat00066
; (2 - 10) for calculating a mechanical seal replacement determination section (2 - 10).

At this time, the 3-phase to 2-phase converter (2-7)

Figure 112014104659082-pat00067
) To two-phase current information (
Figure 112014104659082-pat00068
) Is characterized by the following equation (3).

Figure 112014104659082-pat00174
- (3)

The output power computing unit (2-8)

Figure 112014075255812-pat00070
) Is given by the following equation (4), and the integrated power (
Figure 112014075255812-pat00071
; kWh) is characterized by the following equation (5).

Figure 112014075255812-pat00072
------ Equation (4)

Figure 112014104659082-pat00175
--------- (5)

On the other hand, as shown in FIG. 2, in the bearing replacement determination unit 2-9,

Figure 112014075255812-pat00074
; kWh) and the rated fatigue life of the bearing provided by the control unit 8 (
Figure 112014075255812-pat00075
; h) and motor-dependent power factor (
Figure 112014075255812-pat00076
; kW) of the bearing life
Figure 112014075255812-pat00077
; h) The equation is characterized by the following equation (6).

Figure 112014075255812-pat00078
- (6)

As shown in Fig. 2, the mechanical seal replacement determination unit 2-10 calculates the accumulated power of the pump (

Figure 112014075255812-pat00079
; kWh) and the maximum allowable life of the seal provided by the control unit 8 (
Figure 112014075255812-pat00080
; h) and the required power factor of the seal (
Figure 112014075255812-pat00081
; kW) of the residual mechanical life of the chemical yarn
Figure 112014075255812-pat00082
; h) The equation is characterized by the following equation (7).

Figure 112014075255812-pat00083
------ Equation (7)

As shown in FIG. 2, in the control unit 8, the remaining service life of the bearing provided by the bearing replacement determination unit 2-9

Figure 112014075255812-pat00084
; h) The minimum life span provided by the manufacturer of this motor or bearing (
Figure 112014075255812-pat00085
), The remaining life of the bearing (
Figure 112014075255812-pat00086
h) this minimum marginal lifetime (
Figure 112014075255812-pat00087
, It is characterized in that a bearing replacement alarm is transmitted to the manager via the communication network or an alarm signal is generated through the display unit or the alarm 9.

2, in the control unit 8, the remaining life of the mechanical seal provided by the mechanical seal replacement discriminating unit 2-10 (

Figure 112014075255812-pat00088
; h) and the minimum life span provided by the manufacturer of the mechanical seal (
Figure 112014075255812-pat00089
) To compare the residual life of the mechanical seal (
Figure 112014075255812-pat00090
; h) This minimum marginal lifetime (
Figure 112014075255812-pat00091
, It is characterized in that a warning alarm is sent through the communication network to the manager or a warning signal is generated through the display unit or the alarm 9.

Hereinafter, the operation and effect of the booster pump bearing and the mechanical seal according to the present invention will be described.

The apparatus of the present invention comprises one or more booster pumps 6 driven by a control unit 8 for a three-phase input power supply line 1 and individual inverters 2 corresponding to the booster pump 6, A gate valve 5-2 or 5-1 is provided between the suction part of the booster pump 6 and the suction pipe and between the discharge part of the booster pump 6 and the discharge pipe, 6 is further provided with a check valve 4 for preventing the backflow of the electric power from being supplied to the discharge tube of the booster pump 7 and between the discharge tube and the input terminal of the individual inverter 2, (2-1), a smoothing DC link capacitor (2-2), and a plurality of current sensors (2- (2-2)). The booster pump system according to claim 1, 3, a voltage sensor 2-4, a V / f controller 2-5, a PWM generator 2-6, a three-phase to two-phase converter 2-7, (2-8), and that is configured as a key technology component bearing replacement determining unit (2-9) and wherein the mechanical seal replacement determination unit (2-10).

The PIM 2-1 of the technical components of the individual inverter 2 includes a rectification unit 2-1-1 and an inverter unit 2-1-2. The rectification unit 2-1- 1) rectifies the AC power supply voltage supplied through the 3-phase input power supply line 1 to a DC voltage, and the inverter unit 2-1-2 performs a function of rectifying the PWM generation unit 2- And a function of converting the smoothed DC voltage by the smoothing DC link capacitor 2-2 into a three-phase AC voltage of variable frequency-variable voltage corresponding to the variable frequency-variable voltage control signal inputted from the smoothing DC- .

Also, the smoothing DC link capacitor 2-2 performs a function of smoothing the DC voltage rectified by the rectification unit 2-1-1.

Also, the plurality of current sensors 2-3 are connected to the three-phase alternating current (AC) output from the inverter unit 2-1-2 in the PIM 2-1

Figure 112014104659082-pat00092
To the three-phase to two-phase conversion unit 2-7 to be described later.

Also, the voltage sensor 2-4 detects the DC voltage smoothed by the smoothing DC link capacitor 2-2

Figure 112014075255812-pat00093
) In real time and provides the DC-CAP replacement period and the TOHC detection unit 2-9 to be described later.

In addition, the V / f controller 2-5 controls the command rotational speed of the booster pump 6

Figure 112014075255812-pat00094
) Is divided by the frequency and the output voltage of the inverter module (
Figure 112014075255812-pat00095
And then supplies the result to the PWM generator 2-6 and the integrated power calculator 2-8 described later.

The PWM generator 2-6 outputs the output voltage of the inverter module determined by the V / f controller 2-5

Figure 112014075255812-pat00096
To generate PWM (Pulse Width Modulation) necessary for controlling the inverter unit 2-1-2.

The 3-phase to 2-phase converter 2 - 7 converts the 3-phase current information (

Figure 112014104659082-pat00097
Phase current information < RTI ID = 0.0 > ((3)
Figure 112014104659082-pat00098
).

Figure 112014104659082-pat00176
- (3)

In addition, in the integrated power calculation unit 2-8, the output voltage (?) Output from the V / f controller 2-5

Figure 112014104659082-pat00100
) Output power (
Figure 112014104659082-pat00101
Phase current information obtained from the 3-phase to 2-phase converter (2-7)
Figure 112014104659082-pat00102
) Of the booster pump 7 is used to calculate the accumulated electric power (
Figure 112014104659082-pat00103
; kWh are calculated through the following equations (4) and (5), respectively, and then the functions are provided to the bearing replacement discrimination unit 2-9 and the mechanical seal replacement discrimination unit 2-10, do.

Figure 112014075255812-pat00104
------ Equation (4)

Figure 112014104659082-pat00177
--------- (5)

In the bearing replacement determination unit 2-9, the accumulated electric power of the pump calculated by the integrated electric power calculation unit 2-8

Figure 112014075255812-pat00106
; kWh), the rated fatigue life of the bearing provided by the control unit 8 (
Figure 112014075255812-pat00107
; h) and motor-dependent power factor (
Figure 112014075255812-pat00108
; kW) is substituted into the following equation (6) to calculate the residual life of the bearing
Figure 112014075255812-pat00109
; h) in real time and transmits the result to the control unit 8 continuously.

Figure 112014075255812-pat00110
- (6)

In the mechanical seal replacement determination unit 2-10, the accumulated electric power of the pump calculated by the integrated electric power calculation unit 2-8

Figure 112014075255812-pat00111
; kWh) and the maximum allowable life of the seal provided by the control unit 8 (
Figure 112014075255812-pat00112
; h) and the required power factor of the seal (
Figure 112014075255812-pat00113
; kW) is substituted into the following equation (7) to calculate the residual life of the mechanical seal (
Figure 112014075255812-pat00114
; h) in real time and transmits the result to the control unit 8 continuously.

Figure 112014075255812-pat00115
------ Equation (7)

Meanwhile, in the control unit 8, as shown in FIG. 2, the bearing replacement determination unit 2-9 determines the remaining life of the bearing

Figure 112014075255812-pat00116
; h) is completed and provided, it is inputted in real time, and then the motor or the bearing manufacturer provides the minimum limit life (< RTI ID = 0.0 >
Figure 112014075255812-pat00117
) And the remaining life of the bearing (
Figure 112014075255812-pat00118
; h are compared with each other (S12).

As a result of the mutual comparison in the control unit 8, the remaining life of the bearing calculated by the bearing replacement discrimination unit 2-9

Figure 112014075255812-pat00119
h) this minimum marginal lifetime (
Figure 112014075255812-pat00120
(Yes in S12), the control unit 8 recognizes the change as a replacement device of the bearing, and directly transmits the bearing replacement alarm to the manager via the wired or the wire communication network, or through the display unit or the alarm 9, A signal is generated (S13).

In the control unit 8, as shown in FIG. 2, the remaining life of the mechanical seal in the mechanical seal replacement discriminating unit 2-10

Figure 112014075255812-pat00121
; (S14), the remaining life of the mechanical seal provided by the mechanical seal replacement determination unit (2-10) (
Figure 112014075255812-pat00122
; h) provided by the manufacturer of the mechanical seal and the minimum life span
Figure 112014075255812-pat00123
(S14), and if the remaining life of the mechanical seal (
Figure 112014075255812-pat00124
; h) This minimum marginal lifetime (
Figure 112014075255812-pat00125
, It is recognized as a mechanical seal replacement time, and a mechanical seal replacement alarm is sent directly to a manager via a wired or wireless communication network, or an alarm signal is generated through the display unit or the alarm 9 (S16) .

Accordingly, not only the convenience to the user of the booster pump system can be greatly improved, but also the reliability of the booster pump system itself can be enhanced, the product cycle cost can be drastically reduced, and the bearing or the mechanical seal can be damaged, It is possible to prevent a state in which the energy is excessively consumed due to an inoperable state or a damaged state, and thus the merchantability can be greatly increased.

Although the preferred embodiments of the present invention have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Which will be apparent to those skilled in the art.

1: 3-phase input power line
2: Individual inverter
2-1: Power Integrated Module (PIM)
2-1-1: rectification section 2-1-2: inverter section
2-2: Pyroelectric DC link capacitor
2-3: Current sensor 2-4: Voltage sensor
2-5: V / f controller 2-6: PWM generator
2-7: 3-phase to 2-phase conversion unit 2-8:
2-9: Bearing replacement discrimination unit 2-10: Mechanical seal replacement discrimination unit
3: Discharge part pressure sensor
4: Reverse check valve
5-1, 5-2: Gate valve
6: Booster pump
7: Electric motor
8:
9: Display or alarm

Claims (7)

One or a plurality of booster pumps are connected to the three-phase input power supply line, and a separate inverter is installed in the booster pump, the drive of which is controlled by the control unit. A gate valve is provided between the suction portion of the booster pump and the suction pipe, A gate valve and a check valve for preventing backflow are installed in series between the discharge part of the pump and the discharge pipe. Between the discharge pipe and the input terminal of the individual inverter, there is provided a discharge part pressure sensor In the booster pump system in which the booster pump bearing and the mechanical seal are replaced,
The individual inverter
A rectifier for receiving AC power through a three-phase input power line and rectifying the DC voltage to a DC voltage; a rectifier for receiving a control signal input from the PWM generator and converting the smoothed DC voltage to a variable frequency- A power integrated module (PIM) composed of an inverter section for converting an AC voltage into an AC voltage;
A smoothing DC link capacitor for smoothing a DC voltage rectified by the rectifying unit;
A DC voltage smoothed by the smoothing DC link capacitor
Figure 112014104659082-pat00126
);
The three-phase alternating current (< RTI ID = 0.0 >
Figure 112014104659082-pat00127
A plurality of current sensors for detecting the currents;
The three-phase current information detected by the current sensors
Figure 112014104659082-pat00128
) To the two-phase current information (
Figure 112014104659082-pat00129
Phase-to-two-phase conversion unit for converting the three-phase to two-phase;
The command rotation speed of the booster pump output from the control unit
Figure 112014104659082-pat00130
) Is divided by the frequency and the output voltage of the inverter module (
Figure 112014104659082-pat00131
/ RTI >
The output voltage of the inverter module determined by the V / f controller (
Figure 112014104659082-pat00132
A PWM generator for generating a PWM (Pulse Width Modulation) signal for controlling the inverter unit using the PWM signal;
An output voltage (Vout) output from the V / f controller
Figure 112014104659082-pat00133
) Output power (
Figure 112014104659082-pat00134
Phase current information obtained from the 3-phase to 2-phase conversion unit
Figure 112014104659082-pat00135
) To calculate the accumulated power (< RTI ID = 0.0 >
Figure 112014104659082-pat00136
; kWh) using a predetermined calculation formula;
The integrated electric power of the pump calculated by the integrated electric power calculation unit (
Figure 112014104659082-pat00137
; kWh) and the rated fatigue life of the bearing
Figure 112014104659082-pat00138
; h) and motor-dependent power factor (
Figure 112014104659082-pat00139
; kW), the residual life of the bearing
Figure 112014104659082-pat00140
; a bearing replacement determination unit operable to calculate a difference h;
The integrated electric power of the pump calculated by the integrated electric power calculation unit (
Figure 112014104659082-pat00141
; kWh) and the maximum allowable life of the seal provided by the control (
Figure 112014104659082-pat00142
; h) and the required power factor of the seal (
Figure 112014104659082-pat00143
; kW), the residual life of the chemical yarn
Figure 112014104659082-pat00144
; and a mechanical seal replacement discriminating part for calculating a mechanical seal displacement h and a mechanical seal replacement discriminating part.
The method according to claim 1,
The three-phase-to-two-phase converter converts the three-phase current information (
Figure 112014104659082-pat00145
) To two-phase current information (
Figure 112014104659082-pat00146
(3): " (3) "" (3) "
Figure 112014104659082-pat00178
- (3)
The method according to claim 1,
The output power calculated by the integrated power calculation unit (
Figure 112014104659082-pat00148
) Is given by the following equation (4), and the integrated power (
Figure 112014104659082-pat00149
; kWh) is the same as the following equation (5).
Figure 112014104659082-pat00150
------ Equation (4)
Figure 112014104659082-pat00179
--------- (5)
The method according to claim 1,
In the bearing replacement determination section, the accumulated power of the pump
Figure 112014075255812-pat00152
; kWh) and the rated fatigue life of the bearing
Figure 112014075255812-pat00153
; h) and motor-dependent power factor (
Figure 112014075255812-pat00154
; kW) of the bearing life
Figure 112014075255812-pat00155
; h) The calculation formula is as shown in the following formula (6).
Figure 112014075255812-pat00156
- (6)
The method according to claim 1,
In the mechanical seal replacement discriminating section, the accumulated electric power of the pump (
Figure 112014075255812-pat00157
; kWh) and the maximum allowable life of the seal provided by the control (
Figure 112014075255812-pat00158
; h) and the required power factor of the seal (
Figure 112014075255812-pat00159
; kW) of the residual mechanical life of the chemical yarn
Figure 112014075255812-pat00160
; h) The calculation formula is as shown in the following formula (7).
Figure 112014075255812-pat00161
------ Equation (7)
The method according to claim 1,
Wherein the controller determines that the remaining life of the bearing provided by the bearing replacement discriminating unit
Figure 112014075255812-pat00162
; h) The minimum life span provided by the manufacturer of this motor or bearing (
Figure 112014075255812-pat00163
), The remaining life of the bearing (
Figure 112014075255812-pat00164
h) this minimum marginal lifetime (
Figure 112014075255812-pat00165
), A bearing replacement alarm is transmitted to a manager via a communication network or an alarm signal is generated through a display or an alarm.
The method according to claim 1,
Wherein the control unit determines the remaining life of the mechanical seal provided by the mechanical seal replacement discriminating unit
Figure 112014075255812-pat00166
; h) and the minimum life span provided by the manufacturer of the mechanical seal (
Figure 112014075255812-pat00167
) To compare the residual life of the mechanical seal (
Figure 112014075255812-pat00168
; h) This minimum marginal lifetime (
Figure 112014075255812-pat00169
) Is less than a predetermined value, a mechanical seal replacement alarm is transmitted to an administrator via a communication network or an alarm signal is generated through a display or an alarm.
KR1020140102390A 2014-08-08 2014-08-08 Booster pump bearing replacement cycle detection device KR101473237B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108645572A (en) * 2018-06-06 2018-10-12 南京采孚汽车零部件有限公司 A kind of test fixture of automobile booster pump
CN112524014A (en) * 2020-11-04 2021-03-19 衢州市质量技术监督检测中心 Frequency conversion air compressor detecting system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100485415B1 (en) 2002-03-12 2005-04-27 버팔로 펌프스 인크. Rotary pump with bearing wear indicator
KR100715252B1 (en) 2002-05-31 2007-05-08 쥬코쿠 덴료쿠 가부시키 가이샤 Method and apparatus for diagnosing residual life of rolling element bearing
KR100861579B1 (en) 2004-03-31 2008-10-07 쥬코쿠 덴료쿠 가부시키 가이샤 Method and device for assessing remaining life of rolling bearing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100485415B1 (en) 2002-03-12 2005-04-27 버팔로 펌프스 인크. Rotary pump with bearing wear indicator
KR100715252B1 (en) 2002-05-31 2007-05-08 쥬코쿠 덴료쿠 가부시키 가이샤 Method and apparatus for diagnosing residual life of rolling element bearing
KR100861579B1 (en) 2004-03-31 2008-10-07 쥬코쿠 덴료쿠 가부시키 가이샤 Method and device for assessing remaining life of rolling bearing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108645572A (en) * 2018-06-06 2018-10-12 南京采孚汽车零部件有限公司 A kind of test fixture of automobile booster pump
CN112524014A (en) * 2020-11-04 2021-03-19 衢州市质量技术监督检测中心 Frequency conversion air compressor detecting system
CN112524014B (en) * 2020-11-04 2022-08-09 衢州市质量技术监督检测中心 Frequency conversion air compressor detecting system

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