CN113532237B - Measuring device and method for measuring axial distance of compressor rotor assembly - Google Patents
Measuring device and method for measuring axial distance of compressor rotor assembly Download PDFInfo
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- CN113532237B CN113532237B CN202110586789.3A CN202110586789A CN113532237B CN 113532237 B CN113532237 B CN 113532237B CN 202110586789 A CN202110586789 A CN 202110586789A CN 113532237 B CN113532237 B CN 113532237B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0002—Arrangements for supporting, fixing or guiding the measuring instrument or the object to be measured
- G01B5/0004—Supports
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- General Physics & Mathematics (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a measuring device, which comprises a positioning seat and a measuring seat, wherein the measuring seat is axially and slidably arranged on the positioning seat, the measuring seat comprises a guide rod and a measuring plate, the measuring plate is overhung and arranged on the guide rod, the guide rod is axially and slidably arranged on the positioning seat, a conversion reference surface which is parallel to an axial reference surface is arranged on the guide rod, the overhung end of the measuring plate is used for being in line contact and abutting with the surface of a target radius of a centrifugal impeller so that the measuring plate is axially moved and then positioned on the surface of the centrifugal impeller, and then the axial height value of the surface of the centrifugal impeller at the abutting position is transferred to the conversion reference surface outside the centrifugal impeller. The measuring device is convenient for measuring the axial dimension value between the surface of the centrifugal impeller at the target radius and the reference surface of the pull rod from the outer side of the compressor rotor assembly, and has high measuring efficiency.
Description
Technical Field
The invention relates to the technical field of measuring clamps of compressor rotor assemblies, in particular to a measuring device. The invention also relates to a method for measuring the axial distance of the compressor rotor assembly.
Background
As shown in fig. 1, the compressor rotor of a certain aero-engine comprises a three-stage axial-flow rotor, a one-stage centrifugal rotor and a pull rod which are coaxially arranged. In the assembly process of the engine, the axial clearance between the rotor piece and the stator piece needs to be controlled so as to ensure the normal operation of the engine.
At present, when the axial dimension of the surface from the shaft neck of the pull rod of the compressor rotor assembly to the target radius of the centrifugal impeller is measured, as the target radius of the centrifugal impeller is a curved surface runner surface, a measuring point at the target radius cannot be found, and conventional measuring tools such as a depth gauge, a height gauge and the like cannot be used for measuring. The three-coordinate measuring device is used for measuring single selected points, the accuracy of data cannot be guaranteed, the measuring and converting period is long, and the assembly progress is affected.
Disclosure of Invention
The measuring device provided by the invention is used for solving the technical problems that the axial dimension of the surface from the shaft neck of the pull rod of the existing compressor rotor assembly to the target radius of the centrifugal impeller is difficult to measure and the measuring efficiency is low.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a measuring device for measure the axial distance value between the radial target department's surface distance pull rod reference surface of the centrifugal impeller of compressor rotor subassembly, wherein, centrifugal impeller and pull rod coaxial layout, measuring device includes positioning seat and measuring seat, the positioning seat is used for supporting the compressor rotor subassembly that awaits measuring from the bottom of compressor rotor subassembly that awaits measuring and as the axial reference surface of measurement, the positioning seat is used for the positioning assembly to await measuring compressor rotor subassembly in order to be measured compressor rotor subassembly centering, and then make the coaxial layout of compressor rotor subassembly that awaits measuring and positioning seat, the measuring seat is located on the positioning seat along axial slidable, the measuring seat includes guide arm and measuring plate, the measuring plate cantilever locates on the guide arm, the guide arm is located on the positioning seat along axial slidable, be equipped with the conversion reference surface that is parallel to axial reference surface on the guide arm, the cantilever end of measuring plate is used for adopting the line contact butt with the surface of centrifugal impeller's radial target department, make the measuring plate locate on the centrifugal impeller after along axial displacement, and then shift the axial height value of the centrifugal impeller of the surface of butt department to centrifugal impeller to the axial reference surface, and then make the axial distance value between the radial target department and the radial target place through the axial reference surface that the axial reference surface of displacement is followed to the axial distance value of the centrifugal impeller.
Further, the measuring plate comprises a connecting plate extending outwards along the radial direction of the guide rod and a measuring head extending downwards along the axial direction of the guide rod, the connecting plate is overhanging and arranged at the top of the guide rod, the first end of the connecting plate is fixedly connected with the guide rod, the measuring head is hung at the second end of the connecting plate, and the shape of the measuring head gradually contracts downwards from top to bottom along the axial direction of the measuring seat until the lowest horizontal position is contracted into a straight line.
Further, the cross section of the measuring head in the axial direction is semicircular or inverted triangle.
Further, the conversion reference surface is on the end face of the guide rod near one end of the measuring plate, and the lowest horizontal position of the measuring head is on the same plane with the conversion reference surface.
Further, the number of the measuring seats is multiple, and the measuring seats are uniformly distributed at intervals along the circumferential direction of the positioning seat.
Further, the conversion datum surface has a surface roughness of no more than 0.4 microns.
Further, the width dimension value of the measuring head is 28 mm to 30 mm.
Further, the positioning seat comprises a sleeve for being inserted and assembled with the pull rod to radially position the pull rod, a lower mounting plate arranged at the bottom of the sleeve and used for supporting the pull rod, and an upper mounting plate arranged at the top of the sleeve and used for being meshed with end teeth of the centrifugal impeller to circumferentially position the centrifugal impeller, wherein the bottom surface of the lower mounting plate is used as an axial reference surface for measurement, and the upper mounting plate, the sleeve and the lower mounting plate are coaxially arranged, and the measuring seat is axially slidably arranged on the upper mounting plate.
Further, the parallelism of the upper mounting plate and the lower mounting plate is not less than 0.005 mm.
The invention also provides a measuring method of the compressor rotor assembly, which adopts the measuring device and comprises the following steps of; assembling the compressor rotor assembly to the positioning seat; the measuring seat moves axially under the guidance of the positioning seat until the measuring seat is abutted against the blades of the centrifugal impeller; and obtaining an axial distance value between the conversion reference surface and the reference surface, and further obtaining an axial dimension value between the surface of the centrifugal impeller at the target radius and the reference surface of the pull rod.
The invention has the following beneficial effects:
according to the measuring device, the positioning seat is used for supporting the compressor rotor assembly and is used as an axial reference surface for measuring the axial dimension of the rotor assembly, and the compressor rotor assembly is centered through the positioning seat, so that the compressor rotor assembly and the positioning assembly are coaxially arranged, and the measuring accuracy is ensured; the positioning seat guides the measuring seat to slide along the axial direction, so that the positioning seat and the measuring seat slide in a matched and gapless manner; the measuring seat comprises a guide rod and a measuring plate, the measuring plate is overhung on the guide rod, the guide rod is axially slidably arranged on the positioning seat, a conversion datum plane parallel to the axial datum plane is arranged on the guide rod, the overhung end of the measuring plate is used for being in line contact with the surface of the centrifugal impeller so that the measuring plate is positioned on the surface of the centrifugal impeller after moving along the axial direction, the axial height value of the surface of the centrifugal impeller at the abutting position is transferred to the conversion datum plane outside the centrifugal impeller, the distance value between the axial lines of the positioning seat is equal to the value of the target radius through the position where the measuring plate is in line contact with the surface of the centrifugal impeller, the axial dimension value between the surface of the centrifugal impeller and the pull rod datum plane is conveniently measured from the outer side of the compressor rotor assembly, and the measuring efficiency is high.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic structural view of a compressor rotor assembly;
FIG. 2 is a schematic view of the structure of a measuring device according to a preferred embodiment of the present invention;
FIG. 3 is a schematic view of the measuring seat of FIG. 2;
FIG. 4 is a top view of the measuring seat of FIG. 2;
FIG. 5 is a schematic view of the positioning seat in FIG. 2;
FIG. 6 is a schematic view of the structure of the measuring device according to the preferred embodiment of the present invention in use;
FIG. 7 is a schematic view of the structure of a measuring plate according to another embodiment of the present invention.
Legend description:
10. a measuring device; 11. a positioning seat; 111. a sleeve; 112. a lower mounting plate; 113. an upper mounting plate; 12. a measuring seat; 121. a guide rod; 1211. converting a reference plane; 122. a measuring plate; 1221. a connecting plate; 1222. a measuring head; 1222a, segment; 1223. an avoidance groove; 123. a bushing.
Detailed Description
Embodiments of the invention are described in detail below with reference to the attached drawing figures, but the invention can be practiced in a number of different ways, as defined and covered below.
FIG. 1 is a schematic structural view of a compressor rotor assembly; FIG. 2 is a schematic view of the structure of a measuring device according to a preferred embodiment of the present invention; FIG. 3 is a schematic view of the measuring seat of FIG. 2; FIG. 4 is a top view of the measuring seat of FIG. 2; FIG. 5 is a schematic view of the positioning seat in FIG. 2; FIG. 6 is a schematic view of the structure of the measuring device according to the preferred embodiment of the present invention in use; FIG. 7 is a schematic view of the structure of a measuring plate according to another embodiment of the present invention.
As shown in fig. 2, the present invention provides a measuring device 10 for measuring an axial distance value between a surface of a centrifugal impeller of a compressor rotor assembly at a target radius and a reference surface of a pull rod, wherein the centrifugal impeller and the pull rod are coaxially arranged, the measuring device 10 comprises a positioning seat 11 and a measuring seat 12, the positioning seat 11 is used for supporting the compressor rotor assembly to be measured from the bottom of the compressor rotor assembly to be measured and is used as a measured axial reference surface, the positioning seat 11 is used for positioning and assembling the compressor rotor assembly to be measured so as to center the compressor rotor assembly to be measured, the compressor rotor assembly to be measured and the positioning seat 11 are coaxially arranged, the measuring seat 12 is axially slidably arranged on the positioning seat 11, the measuring seat 12 comprises a guide rod 121 and a measuring plate 122, the measuring plate 122 is cantilevered on the guide rod 121, the guide rod 121 is axially slidably arranged on the positioning seat 11, a conversion datum surface 1211 parallel to the axial datum surface is arranged on the guide rod 121, the overhanging end of the measuring plate 122 is used for being in line contact with the surface of the target radius of the centrifugal impeller so as to enable the measuring plate 122 to be positioned on the surface of the centrifugal impeller after moving axially, further, the axial height value of the surface of the centrifugal impeller at the abutting position is transferred to the conversion datum surface 1211 outside the centrifugal impeller, the measuring plate 122 is driven to move axially through the guide rod 121, further, the overhanging end of the measuring plate 122 is in line contact with the surface of the target radius of the centrifugal impeller so as to transfer the axial height value of the target radius of the centrifugal impeller to the conversion datum surface 1211 outside the centrifugal radius, further, the axial dimension value between the surface at the target radius of the centrifugal impeller and the drawbar reference surface is obtained by measuring the distance between the conversion reference surface 1211 and the drawbar reference surface.
The measuring device 10 of the present invention comprises a positioning seat 11 and a measuring seat 12. The positioning seat 11 is used for supporting the compressor rotor assembly and is used as an axial reference surface for measuring the axial dimension of the rotor assembly, and the positioning seat 11 is used for centering the compressor rotor assembly, so that the compressor rotor assembly and the positioning assembly are coaxially arranged, and the measurement accuracy is ensured; the positioning seat 11 guides the measuring seat 12 to slide along the axial direction, so that the positioning seat 11 and the measuring seat 12 slide in a matched and gapless manner; the measuring seat 12 comprises a guide rod 121 and a measuring plate 122, the measuring plate 122 is overhanging on the guide rod 121, the guide rod 121 is axially slidably arranged on the positioning seat 11, a conversion datum surface 1211 which is parallel to the axial datum surface is arranged on the guide rod 121, the overhanging end of the measuring plate 122 is used for being in line contact with the surface of the centrifugal impeller so that the measuring plate 122 is positioned on the surface of the centrifugal impeller after being axially moved, the axial height value of the surface of the centrifugal impeller at the abutting position is further transferred onto the conversion datum surface 1211 outside the centrifugal impeller, the distance value between the position, which is used for being in line contact with the surface of the centrifugal impeller, of the measuring plate 122 and the axial lead of the positioning seat 11 is equal to the value of the target radius, the axial dimension value between the surface of the centrifugal impeller and the pull rod datum surface at the target radius of the centrifugal impeller is conveniently measured from the outer side of the compressor rotor assembly, and the measuring efficiency is high.
It will be appreciated that in this embodiment, in order to accurately measure the axial distance value between the surface at the target radius of the centrifugal impeller of the compressor rotor assembly and the tie rod reference surface, which is the end surface at the journal location of the tie rod, the measuring plate 122 is adapted to be in line contact with the surface of the centrifugal impeller, and the distance value between the position of line contact and the axis of the positioning seat 11 is equal to the value of the target radius. In the present invention, the value of the target radius may be 118 mm. The radius value is designed to ensure the axial clearance between two parts and prevent scraping of the rotor and stator at the place where the radius r=118 of the centrifugal impeller and the radius r=118 of the centrifugal impeller housing of the object are required to measure the axial clearance.
It will be appreciated that the tie rod datum surface may also be the end surface of the tie rod at the end remote from the centrifugal impeller. The position where the measuring plate 122 is in line contact with the surface at the target radius of the centrifugal impeller may be in the same plane as the conversion reference surface 1211 or in a different plane from the conversion reference surface 1211.
Further, as shown in fig. 3 and 4, the measuring plate 122 includes a connecting plate 1221 extending outwards along the radial direction of the guiding rod 121 and a measuring head 1222 extending downwards along the axial direction of the guiding rod 121, the connecting plate 1221 is overhanging on the top of the guiding rod 121, a first end of the connecting plate 1221 is fixedly connected with the guiding rod 121, a measuring head 1222 is hung on a second end of the connecting plate, and the shape of the measuring head 1222 gradually contracts downwards from top to bottom along the axial direction of the measuring seat 12 until the lowest horizontal position contracts into a straight line. In the invention, the lowest point of the measuring head 1222 and the target radius of the blade of the centrifugal impeller can be conveniently contacted by arranging the lowest horizontal position of the measuring head 1222 to be contracted into a straight line, and the position which possibly forms a hindrance can be judged according to the curved surface condition of the blade of the centrifugal impeller by gradually contracting the outer shape of the measuring head 1222 from top to bottom along the axial direction of the measuring seat 12, so that the measuring head 1222 is contracted from top to bottom, and interference between the measuring head 1222 and the blade of the centrifugal impeller near the contact position is avoided, and the measuring accuracy is influenced. Through setting up measuring plate 122 radial layout, measuring head 1222 is laid along the axial, and then when measuring the axial distance value between the surface distance pull rod reference plane of the target radius department of centrifugal impeller through the gauge head, make the gauge head set up along the surface of the blade of perpendicular to centrifugal impeller, whether be convenient for observe the gauge head from the outside and whether laminate with the surface of the blade of centrifugal impeller, guaranteed measuring result's accuracy and the convenience of operation.
Further, in order to eliminate errors and facilitate the fabrication of the structure, the axial cross-section of the measuring head 1222 is semicircular or inverted triangle in shape.
Further, to facilitate direct acquisition of the measurement results to obtain an axial distance value between the surface at the target radius of the centrifugal impeller of the compressor rotor assembly and the tie rod reference surface, the conversion reference surface 1211 is on the end face of the guide rod 121 near the end of the measurement plate 122.
Further, in order to facilitate simultaneous measurement from a plurality of corresponding target radii, the number of measuring seats 12 is plural, and the plurality of measuring seats 12 are uniformly spaced apart in the circumferential direction of the positioning seat 11. In the invention, the simultaneous measurement is carried out by arranging the plurality of measuring seats 12 which are mutually independent, so that the degree of matching of the positioning seat 11 and the compressor rotor assembly can be conveniently observed from a plurality of directions, the positioning seat 11 and the compressor rotor assembly are ensured to be completely matched before measurement, further repeated measurement is avoided, and the measurement efficiency is improved.
Further, the surface roughness of the conversion reference surface 1211 is not more than 0.4 μm.
Further, the measurement head 1222 has a width dimension value of 28 to 30 millimeters. Optionally, the width dimension of the measuring head 1222 is 30mm, so that the measuring head is guaranteed to be lapped on the blade on one side of the centrifugal impeller during measurement, and the measuring head is perpendicular to the blade to be measured, so that the accuracy of measured data is guaranteed.
Further, as shown in fig. 5, the positioning seat 11 includes a sleeve 111 for being inserted into the tie rod to radially position the tie rod, a lower mounting plate 112 for supporting the tie rod provided at the bottom of the sleeve 111, an upper mounting plate 113 provided at the top of the sleeve 111 for being engaged with end teeth of the centrifugal impeller to circumferentially position the centrifugal impeller, a bottom surface of the lower mounting plate 112 serving as an axial reference surface for measurement, the upper mounting plate 113, the sleeve 111 and the lower mounting plate 112 being coaxially arranged, and the measuring seat 12 being axially slidably provided on the upper mounting plate 113.
Further, the parallelism of the upper mounting plate 113 and the lower mounting plate 112 is not less than 0.005 mm. Alternatively, the upper and lower mounting plates 113, 112 are flat plates.
Further, the measuring device 10 further includes a bushing 123 for supporting the measuring seat 12 on the upper mounting plate 113, the bushing 123 is disposed on the upper mounting plate 113, the guide rod 121 axially passes through the bushing 123 and is slidably disposed on the upper mounting plate 113, the measuring head 1222, the connecting plate 1221 and the guide rod 121 are enclosed to form a downward opening avoidance slot 1223, and the measuring plate 122 is clamped on the top of the bushing 123 by moving the guide rod 121 axially, so that the bushing 123 supports the measuring head 1222 from one end of the measuring head 1222 to avoid damage to the measuring head 1222. Through setting up bush 123, when measuring device 10 is not used, can prop connecting plate 1221 and then make measuring head 1222 hang in the top of upper mounting plate 113 through bush 123, avoid measuring head 1222 and upper mounting plate 113 contact, avoid measuring head 1222 impaired, be favorable to improving measuring head 1222's life and measurement accuracy.
Further, a guide hole is formed in the upper mounting plate 113, the guide rod 121 is inserted into the guide hole in the axial direction, one end of the guide rod 121, which is far away from the measuring plate 122, passes through the guide hole, and a mounting hole for mounting a limiting pin is formed in the passing end of the guide rod 121. By providing the mounting hole on the guide rod 121 and inserting the limiting pin, the guide rod 121 is prevented from being separated from the upper mounting plate 113 upwards along the axial direction, and the measuring seat 12 is prevented from being lost.
Further, the measuring device 10 further includes a circumferential positioning portion for performing circumferential positioning on the measuring seat 12, a positioning groove axially disposed is concavely disposed on the circumferential outer wall surface of the guide rod 121, a corresponding positioning hole is disposed on the upper mounting plate 113, the positioning hole and the positioning groove are axially disposed correspondingly, a first end of the circumferential positioning portion is axially clamped into the positioning hole, a second end of the circumferential positioning portion is axially clamped into the positioning groove, and then the guide rod 121 is circumferentially positioned. By arranging the circumferential positioning part, the measurement seat 12 is prevented from rotating along the circumferential direction relative to the positioning seat 11 during measurement, and the measurement accuracy is improved.
Referring to fig. 6, in the measuring device 10 of the present invention, when measurement is not needed, the measuring seat 12 is only supported on the upper mounting plate 113 through the bushing 123; when measurement is required, the measuring seat 12 is rotated to enable the measuring head 1222 of the measuring seat 12 to avoid the compressor rotor assembly, then the compressor rotor assembly is assembled on the positioning seat 11, the compressor rotor assembly is centered through the positioning seat 11, then the measuring seat 12 is lifted vertically upwards to enable the lowest position of a measuring head of the measuring seat 12 to be higher than the surface of an impeller of the centrifugal impeller, the measuring head 1222 cannot be pulled out of the upper mounting plate 113 under the action of a limiting pin, the measuring seat 12 is rotated again, the measuring seat 12 is arranged opposite to the compressor rotor assembly, the measuring seat 12 is circumferentially positioned through the circumferential positioning part, finally the measuring seat 12 is axially lowered and the measuring head 1222 is abutted against the surface of a blade of the centrifugal impeller, and an axial distance value between the conversion reference surface 1211 and the reference surface is obtained.
More preferably, referring to FIG. 7, in another embodiment of the invention, the surface of the measurement head 1222 is provided with a localized concave configuration for avoiding peripheral structures during measurement to ensure line contact and coincidence with the blade contact location of the centrifugal impeller at the lowest level of the measurement head 1222. The partial recess is configured as a segment 1222a such that a line at the lowest position of the measurement head 1222 is in contact with a line of blade contact locations of the centrifugal impeller. The portion that may constitute the obstruction is determined based on the profile characteristics of the blades of the centrifugal impeller, so that the segment 1222a is designed at the portion that constitutes the obstruction, so that the accuracy of measurement is ensured during actual measurement. The cross section formed by the segment 1222a is spaced from the axis of the measuring head 1222, thereby facilitating the observation of the fit between the measuring head 1222 and the blades of the centrifugal impeller while avoiding interference.
The invention also provides a measuring method of the compressor rotor assembly, which adopts the measuring device 10 and comprises the following steps of; assembling the compressor rotor assembly to the positioning seat 11; the measuring seat 12 moves axially under the guidance of the positioning seat 11 until the measuring seat 12 is abutted against the blades of the centrifugal impeller; the axial distance value between the conversion datum 1211 and the datum is obtained, and the axial dimension value between the surface at the target radius of the centrifugal impeller and the pull rod datum is obtained.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A measuring device for measuring an axial distance value between a surface at a target radius of a centrifugal impeller of a compressor rotor assembly and a reference surface of a pull rod, wherein the centrifugal impeller and the pull rod are coaxially arranged, characterized in that,
the measuring device comprises a positioning seat (11) and a measuring seat (12),
the positioning seat (11) is used for supporting the compressor rotor assembly to be measured from the bottom of the compressor rotor assembly to be measured and serving as an axial reference surface for measurement, the positioning seat (11) is used for positioning and assembling the compressor rotor assembly to be measured so as to center the compressor rotor assembly to be measured, the compressor rotor assembly to be measured and the positioning seat (11) are further coaxially arranged, the measuring seat (12) is axially and slidably arranged on the positioning seat (11),
the measuring seat (12) comprises a guide rod (121) and a measuring plate (122), the measuring plate (122) is overhung on the guide rod (121), the guide rod (121) is axially slidably arranged on the positioning seat (11), a conversion reference surface (1211) which is parallel to the axial reference surface is arranged on the guide rod (121), the overhung end of the measuring plate (122) is used for being in line contact with the surface of the centrifugal impeller at the target radius to enable the measuring plate (122) to be positioned on the surface of the centrifugal impeller after being axially moved, and then the axial height value of the surface of the centrifugal impeller at the abutting position is transferred to the conversion reference surface (1211) outside the centrifugal impeller,
the guide rod (121) drives the measuring plate (122) to axially move, so that the overhanging end of the measuring plate (122) is abutted against the surface of the target radius of the centrifugal impeller in a line contact manner, the axial height value of the target radius of the centrifugal impeller is transferred to a conversion reference surface (1211) outside the centrifugal radius, and the axial size value between the surface of the target radius of the centrifugal impeller and the pull rod reference surface is obtained by measuring the distance between the conversion reference surface (1211) and the axial reference surface.
2. The measuring device according to claim 1, wherein,
the measuring plate (122) comprises a connecting plate (1221) extending outwards along the radial direction of the guide rod (121) and a measuring head (1222) extending downwards along the axial direction of the guide rod (121), the connecting plate (1221) is overhung on the top of the guide rod (121), the first end of the connecting plate (1221) is fixedly connected with the guide rod (121), the second end of the connecting plate (1221) is hung with the measuring head (1222),
the measuring head (1222) has a profile which gradually tapers from top to bottom in the axial direction of the measuring seat (12) until it tapers in a straight line at the lowest horizontal position.
3. The measuring device according to claim 2, wherein,
the axial cross section of the measuring head (1222) is semicircular or inverted triangle.
4. The measuring device according to claim 2, wherein,
the conversion reference surface (1211) is located on an end surface of the guide rod (121) near one end of the measuring plate (122),
the lowest horizontal position of the measuring head (1222) is in the same plane as the conversion reference plane (1211).
5. The measuring device according to claim 2, wherein,
the number of the measuring seats (12) is multiple, and the measuring seats (12) are uniformly distributed at intervals along the circumferential direction of the positioning seat (11).
6. The measuring device according to claim 2, wherein,
the conversion datum (1211) has a surface roughness of no more than 0.4 microns.
7. The measuring device according to claim 2, wherein,
the measuring head (1222) has a width dimension value of 28 to 30 mm.
8. The measuring device according to claim 2, wherein,
the positioning seat (11) comprises a sleeve (111) for being inserted and assembled with the pull rod to radially position the pull rod, a lower mounting plate (112) arranged at the bottom of the sleeve (111) and used for supporting the pull rod, an upper mounting plate (113) arranged at the top of the sleeve (111) and used for being meshed with end teeth of the centrifugal impeller to circumferentially position the centrifugal impeller, the bottom surface of the lower mounting plate (112) is used as an axial reference surface for measurement,
the upper mounting plate (113), the sleeve (111) and the lower mounting plate (112) are coaxially arranged, and the measuring seat (12) is axially and slidably arranged on the upper mounting plate (113).
9. The measuring device of claim 8, wherein the measuring device comprises a sensor,
the parallelism of the upper mounting plate (113) and the lower mounting plate (112) is not less than 0.005 mm.
10. A method of measuring a compressor rotor assembly using a measuring device according to any one of claims 1 to 9, comprising the steps of;
assembling the compressor rotor assembly to a positioning seat (11);
the measuring seat (12) moves axially under the guidance of the positioning seat (11) until the measuring seat (12) is abutted against the blades of the centrifugal impeller;
an axial distance value between the transition datum (1211) and the axial datum is obtained, and then an axial dimension value between the surface at the target radius of the centrifugal impeller and the pull rod datum is obtained.
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| CN202110586789.3A CN113532237B (en) | 2021-05-27 | 2021-05-27 | Measuring device and method for measuring axial distance of compressor rotor assembly |
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