CN116557308A - Mixed flow pump set axis adjustment method - Google Patents

Abstract

The invention discloses a method for adjusting the axis of a mixed flow pump set, which relates to the technical field of water conservancy and hydropower, and comprises the following steps: s1: the mixed flow pump set is subjected to integral debugging, and after the pre-loading of the frame is completed, an anti-weight plate of the thrust bearing is installed; s2: the heavy-duty plate is used as a reference surface, and an insulating pad, an insulating sleeve, a thrust tile and a thrust head are sequentially installed to finish the installation of the thrust head; s3: adjusting the gap of the thrust bearing by utilizing a jigger to obtain corresponding full swing degree and net swing degree; s4: calculating the tile holding gap of each part according to the full swing degree and the net swing degree of each part of the shafting after the adjustment, and adjusting the axis according to the tile holding gap; the invention can improve the service life of the bearing, reduce the vibration swing of the unit, effectively control the temperature rise of the bearing oil and the like, and improve the running condition of the unit.

Description

Mixed flow pump set axis adjustment method

Technical Field

The invention relates to the technical field of water conservancy and hydropower, in particular to a method for adjusting the axis of a mixed flow pump set.

Background

At present, in the whole construction process of pump station pump set installation, the axis jigger adjustment of motor and water pump is the most important one construction process, and its construction quality directly influences the stable long-term operation of pump set under the condition of facing complicated operating mode. In the face of continuous improvement of equipment manufacturing and application technology, higher requirements are also put forward on the installation technology of our construction site. The axis adjustment is a core process for the installation of the whole unit, and the quality of the axis adjustment directly influences the safe operation of the water pump. The axis adjustment work of the machine set can be performed, the effects of prolonging the service life of the bearing, reducing the vibration swing degree of the machine set, effectively controlling the temperature rise of bearing oil and the like can be achieved, and the running working condition of the machine set is improved.

However, due to manufacturing tolerances, errors in installation, accumulated errors after installation, etc., the axis in operation is operated around a track offset by a certain angle and radius from the theoretical axis, if the axis is not adjusted in time, the overall life of the unit is easily reduced, and related adjustment processes are absent in the prior art.

Therefore, how to provide a method for adjusting the axis of a mixed-flow pump set, which can solve the above problems, is a problem that needs to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, the invention provides a method for adjusting the axis of a mixed flow pump set, which can improve the service life of a bearing, reduce the vibration swing of a unit, effectively control the temperature rise of bearing oil and the like, and improve the running condition of the unit.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

the axial line adjusting method of the mixed flow pump set is applied to the mixed flow pump set and comprises an upper frame, a stator, a thrust bearing, a motor jigger and a pump set guide bearing, and comprises the following steps:

s1: the mixed flow pump set is subjected to integral debugging, and after the pre-loading of the frame is completed, an anti-weight plate of the thrust bearing is installed;

s2: the heavy-duty plate is used as a reference surface, and an insulating pad, an insulating sleeve, a thrust tile and a thrust head are sequentially installed to finish the installation of the thrust head;

s3: adjusting the gap of the thrust bearing by utilizing a jigger to obtain corresponding full swing degree and net swing degree;

s4: and calculating the tile holding gap of each part according to the full swing degree and the net swing degree of each part of the shafting after the adjustment, and adjusting the axis according to the tile holding gap.

Preferably, the S1 specifically includes:

s11: measuring the levelness value of the weight-resistant plate by using a level meter, and comparing the levelness value with a preset threshold value;

s12: when the levelness value is smaller than or equal to the preset threshold value, not adjusting;

s13: and when the levelness value is larger than the preset threshold value, adjusting by increasing or decreasing the metal gaskets on the contact surface of the upper frame and the stator.

Preferably, the S2 specifically includes:

s21: heating the thrust head until the matched size reaches a preset range value for installation;

s22: and the insulating pad, the insulating sleeve, the thrust tile and the thrust head are sequentially installed during installation.

Preferably, the step S3 specifically includes:

s31: 8-equal dividing marking is carried out on the thrust head, marking points are numbered, and a dial indicator is placed on each marking point;

s32: pushing the jigger, and recording data of the dial indicator when the jigger rotates for 45 degrees each time;

s33: and obtaining the corresponding full swing degree and net swing degree according to the data of the dial indicator.

Preferably, the S4 specifically includes: the axis adjustment is performed by adding shims or scraping flanges at the thrust shaft.

Compared with the prior art, the invention discloses a method for adjusting the axis of the mixed flow pump set, which adopts a static quality control and dynamic axis detection method to adjust the axis of the set. The dynamic jigger data analysis and calculation are used for solving the possible situations of non-vertical axis and tortuous axis, and meeting the stable operation requirement of the pump set in various working conditions. According to the technical research, the construction period is shortened, the labor intensity is reduced, the quality and the construction efficiency of the pump set in the process of adjusting the installation axis of the pump set are improved, various technical indexes of the axis of the pump set equipment are strictly controlled through a jigger adjusting technical method, and the unbalanced force of rotating parts in the operation of the unit can be reduced. The influence of magnetic force and hydraulic unbalance on the operation of the unit is reduced to the greatest extent, and the unit is ensured to maintain a stable operation state.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

FIG. 1 is an overall flow chart of a method for adjusting the axis of a mixed flow pump set provided by the invention;

fig. 2 is a schematic diagram of adjustment of a weight plate according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1, the embodiment of the invention discloses a mixed flow pump set axis adjustment method, which is applied to a mixed flow pump set and comprises an upper frame, a stator, a thrust bearing, a motor jigger and a pump set guide bearing, and comprises the following steps:

s1: the method comprises the steps of integrally debugging a mixed flow pump set, and installing an anti-weight plate of a thrust bearing after the complete pre-installation of a frame;

s2: the heavy-duty plate is used as a reference surface, and an insulating pad, an insulating sleeve, a thrust tile and a thrust head are sequentially installed to finish the installation of the thrust head;

s3: adjusting the gap of the thrust bearing by utilizing a jigger to obtain corresponding full swing degree and net swing degree;

s4: and calculating the tile holding gap of each part according to the full swing degree and the net swing degree of each part of the shafting after the adjustment, and adjusting the axis according to the tile holding gap.

Specifically, the mounting work before the axis adjustment is performed includes:

(1) And (3) installing a pump seat of the water pump: the deviation of various technical indexes such as the center, the elevation, the level and the like of the pump base foundation pump base and the datum point of the construction measuring network meet the requirements, the secondary concrete pouring is completed after the experience is qualified, and various indexes such as the strength and the like of the concrete after curing meet the requirements.

(2) The impeller chamber, the suction horn pipe section and the water guide cone are hung into a machine pit, construction is carried out according to the drawing, and the installation of each part and the external dimension is checked to meet the design requirement. After meeting the requirements, the suction horn tube is disassembled, and the impeller chamber (split) is placed at the bottom of the pit; the water guide cone is placed at the approximate position of the center of the unit, and the unit is adjusted and installed after the center adjustment is completed.

(3) And (5) installing an impeller. Before installation, firstly performing leakage test, after all the parts are qualified, hoisting the impeller to an approximate elevation by using a bridge crane, then using a winch and a roller to position the impeller to a position where the installation platform is opposite to the center position of the pump shaft, and hoisting the pump shaft to the impeller chamber to be connected with the impeller. And (5) hanging the impeller into a pit, and placing the impeller on a corresponding elevation and center platform.

(4) Cleaning the guide vane body and the middle connecting pipe at the installation site, combining, and hanging the whole guide vane body and the middle connecting pipe into a pit for installation, wherein a clearance between the combined joints cannot be plugged by using a 0.05mm plug gauge. And rechecking the center, the elevation and the level, and tightening bolts after the design requirement is met, and drilling pin holes with the pump seat. After the guide vane body is installed qualified, the lower water guide bearing hole is used as a measurement standard of the vertical coaxiality of the pump set, a piano wire is hung, the error of the central standard wire is not more than 0.05mm, the piano wire is used as a bent pipe section, and the central standard of the upper and lower frames and the stator of the motor is used as the central standard of the stator

(5) And cleaning and polishing the middle combined flange surface of the pipe and the 60-degree bent pipe section, retesting the center, the level and the elevation of the combined flange surface, installing the 60-degree bent pipe section after meeting the requirements, and measuring that the combined flange surface cannot pass through by using a 0.05mm feeler gauge. The same method is used for installing a 30-degree bend pipe section, an expansion joint and a water outlet pipe section.

(6) The lower frame of the motor and the stator are arranged on the same foundation, and firstly, 4 foundation plates with delta=12 mm are buried when the motor layer is poured with concrete. Before hoisting, four pairs of wedge plates are placed, then a lower frame and a stator are respectively hoisted, and simultaneously the upper frame is hoisted for preassembling. The center, the elevation and the level of the lower frame, the stator and the upper frame are adjusted after being positioned, and the following requirements are met by taking the stator as a main part: 1) The center deviation of the upper and lower frames is not more than 1mm; 2) The horizontal deviation is not more than 0.10mm/m; 3) The elevation deviation is not more than +/-1.5 mm; 4) Designing an air gap with the difference between each radius of the center and the average radius of the center being < + -4%; 5) The stator installation elevation is calibrated according to the magnetic field center line, so that the average center line of the stator core is equal to or higher than the average center line of the rotor magnetic poles, and the value of the elevation is not more than 0.5% of the effective length of the stator core. And after the concrete is qualified, reinforcing, removing the positioning pin after the positioning pin is hinged on the upper frame, and delivering the concrete in the second period of casting on the lower frame and the stator foundation.

(7) And hoisting the pump shaft to the impeller chamber and connecting the pump shaft with the impeller, hoisting the impeller chamber and sucking the horn tube section after the pump shaft is connected with the impeller.

(8) And (5) hoisting the rotor. The rotor is lifted and slowly falls on the brake, and special attention is paid to preventing the rotor from rubbing with the stator and preventing the generator shaft from colliding with the water pump shaft. After the rotor is hoisted in place, the installation work of the pump set enters a series of key working procedures of upper frame installation, bearing installation, axis jigger adjustment and the like for construction.

In a specific embodiment, S1 specifically includes:

s11: measuring the levelness value of the weight-resistant plate by using a level meter, and comparing the levelness value with a preset threshold value;

s12: when the levelness value is smaller than or equal to a preset threshold value, not adjusting;

s13: when the levelness value is larger than a preset threshold value, the metal gaskets are increased or decreased on the contact surface of the upper frame and the stator for adjustment.

Specifically, the upper frame of the suspension structure is arranged on the top surface of the stator, the upper frame is pre-assembled in the stator installation, and all indexes such as the center, the elevation, the levelness and the like of the upper frame are preliminarily adjusted in the working of the previous step and are positioned by adopting positioning pins. The thrust bearing weight plate is typically primarily mounted on the upper housing. In the thrust tile unit with the elastic gasket self-adjusting structure, the levelness requirement on the position of the thrust seat heavy plate is high. The levelness error adjustment of the upper rack is mainly aimed at quality control by taking the top surface of the heavy-duty plate as a reference.

The installation height of the thrust bearing unit with the elastic washer structure cannot be compensated and adjusted when the thrust bearing unit with the elastic washer structure is positioned on the upper frame, and the installation height of the top surface of the heavy-duty plate is calculated by combining the combined heights of the elastic washer, the thrust bearing and the mirror plate in advance to regulate and control.

Referring to fig. 2, the upper frame weight-resistant plate is in an annular structure, and is placed in different directions along tangential directions through a frame level meter or a phase-combining level meter and the like in the installation of a thrust bearing seat, and repeatedly measured in a turning way, 8 measuring points are measured in the circumferential direction of +X-Y-X-Y, and the actual horizontal error is the average value of two sides. The horizontal error of the position of the anti-weight plate is generally controlled within the range of 0.02mm/m, the error exceeding the allowable range can be adjusted by adding or removing metal gaskets on the joint surface of the upper frame and the stator, and the shape and the size of the contact surface of the metal gaskets and the joint surface are basically the same, so that the metal gaskets can be prevented from loosening in operation.

And after the height and levelness of the top surface of the heavy-duty plate meet the requirements, carrying out retest inspection after tightly assembling the bolts and installing the locating pins.

In a specific embodiment, S2 specifically includes:

s21: heating the thrust head until the matched size reaches a preset range value, and installing;

s22: and an insulating pad, an insulating sleeve, a thrust shoe and a thrust head are sequentially installed during installation.

Specifically, the combined height measurement is carried out on the elastic gasket and the thrust tile by the depth gauge before the thrust bearing is installed, and the height of the elastic gasket and the thrust tile is deviated due to the processing size, the position of each assembly is adjusted according to the combined heights, so that the combined heights on the circumference and the symmetrical positions are basically consistent on the basis of taking the weight-resisting plate as a reference plane, and the combined height error is controlled within the range of 0.04 mm.

Because the main shaft and the thrust head are in interference fit, the thrust head is generally installed on the main shaft by adopting a hot sleeve method. Before installation, the main shaft and the thrust head are cleaned, the thrust head is heated by adopting an eddy current heating method, the inner hole and the outer diameter of the shaft of the thrust head are measured in the heating process, and the thrust head is sleeved when the matched size reaches a unilateral gap of about 0.1-0.2 mm. After the thrust head is sleeved, the clamping ring is installed for fixing.

The mirror plate is connected with the thrust head, the insulation pad and the insulation sleeve are cleaned, and the insulation requirement is met by insulation resistance measurement.

In a specific embodiment, S3 specifically includes:

s31: 8, equally dividing and marking the thrust head, numbering the marked points, and placing a dial indicator on each marked point;

s32: pushing the jigger, and recording data of the dial indicator when the jigger rotates for 45 DEG each time;

s33: and obtaining the corresponding full swing and net swing according to the data of the dial indicator.

Specifically, an axis of the motor is adjusted by adopting a dynamic monitoring method, a correction value of a position with the swing degree exceeding the standard is calculated according to jigger data of a lower guide shaft collar, an insulation pad scraping correction value at a thrust head is determined, and technical indexes such as swing degree values of all positions of a motor shaft and levelness of the thrust head are adjusted to be within a required range.

The jigger work of the water pump plays an important role in pump installation, and the conditions of inclination, fold lines and the like of the axis of the pump set can be eliminated through jigger adjustment, so that the jigger work plays a key role in improving the service lives of the swing, vibration, bearings and other parts during the operation of the pump set. And guiding the adjustment of the clearance of each guide bearing through the jigger adjustment data.

1. After the installation and adjustment of the front thrust bearing of the locomotive are finished, the thrust bearing is uniformly stressed, the levelness error is less than or equal to 0.02mm/m, and 8-equal-division indexing marks are made on the thrust head, the upper guide shaft collar, the lower guide shaft collar and the water guide shaft collar and the measuring points are numbered.

2. The upper guide bearing is symmetrically provided with 4 guide shoes or 3 guide shoes which are equally divided into circles, and the main shaft is adjusted to be positioned at the center. The bearing bush and the thrust bush generally adopt lard with small friction coefficient as a lubricant.

3. The upper guide shaft collar, the lower guide shaft collar, the motor flange and the water guide shaft collar are respectively provided with dial indicators in the X, Y direction, and the dial indicators in different layers are aligned according to plumb line positions.

4. The pump group jigger is usually pushed by manpower, and a rotary jigger device is arranged at the end part of the shaft. The dial indicators of each layer are monitored and recorded by special persons, unified command is performed when the jigger is started, and corresponding numerical values are recorded when the jigger rotates for 450 angles or measuring points each time.

5. And calculating full swing degree and net swing degree according to the corresponding relative points of the readings of each measuring point to judge the inclination amount of the axis. And (3) adjusting the swing degree value of each part of the shaft collar to be within a qualified range by scraping the insulating gasket at the thrust head.

In a specific embodiment, S4 specifically includes:

the axis adjustment is performed by adding shims or scraping flanges at the thrust shaft.

And calculating the bearing holding gap of each part according to the actual value of the swing degree of each part of the shafting after the adjustment is finished, so that each bearing bush is always kept in the actual movement center range of the shafting, and the bearing bushes are ensured to be damaged due to the conditions of eccentric wear, poor strength and the like caused by the synchronization of each bearing bush and the movement center of the shafting in the shafting range. The error of the actual axis exists, and the clearance adjustment of each guide bearing is guided according to the actual swing degree of the shaft collar of each part, so that the guide bearing of each part and the shaft motion track of the part are kept at the concentric position. The method can be used for adjusting the bearing stress of each part uniformly and reducing the vibration value of the pump set.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (5)

1. The axial line adjustment method of the mixed flow pump set is applied to the mixed flow pump set and comprises an upper frame, a stator, a thrust bearing, a motor jigger and a pump set guide bearing, and is characterized by comprising the following steps of:

s1: the mixed flow pump set is subjected to integral debugging, and after the pre-loading of the frame is completed, an anti-weight plate of the thrust bearing is installed;

s2: the heavy-duty plate is used as a reference surface, and an insulating pad, an insulating sleeve, a thrust tile and a thrust head are sequentially installed to finish the installation of the thrust head;

s3: adjusting the gap of the thrust bearing by utilizing a jigger to obtain corresponding full swing degree and net swing degree;

s4: and calculating the tile holding gap of each part according to the full swing degree and the net swing degree of each part of the shafting after the adjustment, and adjusting the axis according to the tile holding gap.

2. The method for adjusting the axis of a mixed-flow pump set according to claim 1, wherein the step S1 specifically comprises:

s11: measuring the levelness value of the weight-resistant plate by using a level meter, and comparing the levelness value with a preset threshold value;

s12: when the levelness value is smaller than or equal to the preset threshold value, not adjusting;

s13: and when the levelness value is larger than the preset threshold value, adjusting by increasing or decreasing the metal gaskets on the contact surface of the upper frame and the stator.

3. The method for adjusting the axis of a mixed-flow pump set according to claim 1, wherein the step S2 specifically comprises:

s21: heating the thrust head until the matched size reaches a preset range value for installation;

s22: and the insulating pad, the insulating sleeve, the thrust tile and the thrust head are sequentially installed during installation.

4. A method for adjusting the axis of a mixed-flow pump set according to claim 3, wherein S3 specifically comprises:

s31: 8-equal dividing marking is carried out on the thrust head, marking points are numbered, and a dial indicator is placed on each marking point;

s32: pushing the jigger, and recording data of the dial indicator when the jigger rotates for 45 degrees each time;

s33: and obtaining the corresponding full swing degree and net swing degree according to the data of the dial indicator.

5. The method for adjusting the axis of a mixed-flow pump set according to claim 1, wherein the step S4 specifically comprises:

the axis adjustment is performed by adding shims or scraping flanges at the thrust shaft.