CN113532237A - 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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- CN113532237A CN113532237A CN202110586789.3A CN202110586789A CN113532237A CN 113532237 A CN113532237 A CN 113532237A CN 202110586789 A CN202110586789 A CN 202110586789A CN 113532237 A CN113532237 A CN 113532237A
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- measuring
- centrifugal impeller
- reference surface
- axial
- guide rod
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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
Abstract
The invention discloses a measuring device which comprises a positioning seat and a measuring seat, wherein the measuring seat is arranged on the positioning seat in an axially slidable manner, the measuring seat comprises a guide rod and a measuring plate, the measuring plate is arranged on the guide rod in an overhanging manner, the guide rod is arranged on the positioning seat in an axially slidable manner, a conversion datum plane parallel to the axial datum plane is arranged on the guide rod, and the overhanging end of the measuring plate is used for being abutted with the surface of a target radius part of a centrifugal impeller in a line contact manner so that the measuring plate is positioned on the surface of the centrifugal impeller after moving in the axial direction, and further the axial height value of the surface of the centrifugal impeller at the abutted part is transferred to the conversion datum plane outside the centrifugal impeller. The measuring device provided by the invention is convenient for measuring the axial dimension value between the surface of the target radius of the centrifugal impeller and the reference surface of the pull rod from the outer side of the compressor rotor assembly, and the measuring efficiency is high.
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 rotor assembly of the compressor.
Background
As shown in fig. 1, a compressor rotor of an aircraft engine includes a three-stage axial flow rotor, a one-stage centrifugal rotor and a tie rod which are coaxially arranged. In the process of assembling the engine, the axial clearance between the rotor part and the stator part needs to be controlled so as to ensure the normal work of the engine.
At present, when the axial size from a draw bar shaft neck of a compressor rotor assembly to the surface of a target radius of a centrifugal impeller is measured, because the target radius of the centrifugal impeller is a curved surface flow channel 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 instrument is used for measuring a selected point, so that the accuracy of data cannot be guaranteed, the measuring and transferring period is long, and the assembly progress is influenced.
Disclosure of Invention
The measuring device provided by the invention is used for solving the technical problems that the axial size of the surface from the pull rod shaft neck of the 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 purpose, the technical scheme adopted by the invention is as follows:
a measuring device is used for measuring an axial distance value between the surface 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, the measuring device comprises a positioning seat and a measuring seat, the positioning seat is used for supporting the compressor rotor assembly to be measured from the bottom of the compressor rotor assembly to be measured and used as an axial reference surface for measurement, the positioning seat 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 is further coaxially arranged with the positioning seat, the measuring seat is axially slidably arranged on the positioning seat, the measuring seat comprises a guide rod and a measuring plate, the measuring plate is cantilevered on the guide rod, the guide rod is axially slidably arranged on the positioning seat, the guide rod is provided with a conversion reference surface which is parallel to the axial reference surface, the cantilever end of the measuring plate is used for being in line contact abutting joint with the surface of the target radius of the centrifugal impeller so that the measuring plate is positioned on the surface of the centrifugal impeller after moving along the axial direction, further, the axial height value of the surface of the centrifugal impeller at the abutting joint is transferred to a conversion reference surface outside the centrifugal impeller, the measuring plate is driven to move along the axial direction through the guide rod, further, the cantilever end of the measuring plate is in line contact abutting joint with the surface of the target radius of the centrifugal impeller so that the axial height value of the target radius of the centrifugal impeller is transferred to the conversion reference surface outside the centrifugal radius, and further, the axial size value between the surface of the target radius of the centrifugal impeller and the reference surface of the pull rod is obtained by measuring the distance between the conversion reference surface and the reference surface of the pull rod.
Further, the measuring board includes the connecting plate of the radial outside extension along the guide bar and the measuring head of the axial downwardly extending along the guide bar, and the connecting plate is encorbelmented and is located the top of guide bar, the first end and the guide bar fixed connection of connecting plate, and the second end of connecting rod is hung and is equipped with the measuring head, and the appearance of measuring head contracts gradually from the top down to the shrink of minimum horizontal position department from the axial of measuring seat becomes a straight line.
Further, the measuring head has an axial cross section in the shape of a semicircle or an inverted triangle.
Furthermore, the conversion reference surface is arranged on the end face of one end, close to the measuring plate, of the guide rod, and the lowest horizontal position of the measuring head and the conversion reference surface are arranged on the same plane.
Furthermore, the number of measuring the seat is a plurality of, and a plurality of measuring seats are evenly arranged along the circumference of positioning seat at interval.
Further, the surface roughness of the conversion reference plane is not more than 0.4 μm.
Further, the measuring head has a width dimension of 28 mm to 30 mm.
Furthermore, the positioning seat comprises a sleeve used for being matched with the pull rod in a plug-in mode 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, the bottom surface of the lower mounting plate is used as an axial reference surface for measurement, the upper mounting plate, the sleeve and the lower mounting plate are coaxially arranged, and the measuring seat is arranged on the upper mounting plate in a sliding mode along the axial direction.
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, and the measuring device comprises the following steps; assembling a compressor rotor assembly to the positioning seat; the measuring seat is axially moved under the guidance of the positioning seat until the measuring seat is abutted to the blades of the centrifugal impeller; and acquiring an axial distance value between the conversion reference surface and the reference surface, and further acquiring an axial dimension value between the surface of the target radius of the centrifugal impeller 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 is used for guiding the measuring seat to slide along the axial direction, so that the positioning seat and the measuring seat can be matched to slide without gap; the measuring seat comprises a guide rod and a measuring plate, the measuring plate is arranged on the guide rod in an overhanging mode, the guide rod is arranged on the positioning seat in an axially sliding mode, a conversion datum plane parallel to the axial datum plane is arranged on the guide rod, the overhanging end of the measuring plate is used for being abutted to the surface of the centrifugal impeller in a line contact mode so that the measuring plate is 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 abutted position is transferred to the conversion datum plane outside the centrifugal impeller, the distance value between the position, in the line contact mode, of the measuring plate and the surface of the centrifugal impeller is equal to the value of a target radius, the axial size value between the surface of the centrifugal impeller and the datum plane of the pull rod is conveniently measured from the outer side of the compressor rotor assembly, the measuring efficiency is high.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a compressor rotor assembly;
FIG. 2 is a schematic structural view of a measuring device according to a preferred embodiment of the present invention;
FIG. 3 is a schematic view of the measuring stand of FIG. 2;
FIG. 4 is a top view of the measuring station of FIG. 2;
FIG. 5 is a schematic structural diagram of the positioning socket in FIG. 2;
FIG. 6 is a schematic view of the measuring device of the preferred embodiment of the present invention in use;
fig. 7 is a schematic structural view of a measurement plate according to another embodiment of the present invention.
Illustration of the drawings:
10. a measuring device; 11. positioning seats; 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 surface; 122. measuring a plate; 1221. a connecting plate; 1222. a measuring head; 1222a, a segment; 1223. an avoidance groove; 13. a bushing.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
FIG. 1 is a schematic view of a compressor rotor assembly; FIG. 2 is a schematic structural view of a measuring device according to a preferred embodiment of the present invention; FIG. 3 is a schematic view of the measuring stand of FIG. 2; FIG. 4 is a top view of the measuring station of FIG. 2; FIG. 5 is a schematic structural diagram of the positioning socket in FIG. 2; FIG. 6 is a schematic view of the measuring device of the preferred embodiment of the present invention in use; fig. 7 is a schematic structural view of a measurement 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 a bottom of the compressor rotor assembly to be measured and is used as an axial reference surface for measurement, the positioning seat 11 is used for positioning and assembling the compressor rotor assembly to be measured to center the compressor rotor assembly to be measured, so that the compressor rotor assembly to be measured and the positioning seat 11 are coaxially arranged, the measuring seat 12 is slidably arranged on the positioning seat 11 in an axial direction, the measuring seat 12 comprises a guide rod 121 and a measuring plate 122, the measuring plate 122 is suspended on the guide rod 121, the guide rod 121 is slidably arranged on the positioning seat 11 in the axial direction, the guide rod 121 is provided with a conversion reference surface 1211 arranged in parallel with the axial reference surface, the overhanging end of the measuring plate 122 is used for abutting with the surface of the centrifugal impeller at the target radius in a line contact manner so that the measuring plate 122 is positioned on the surface of the centrifugal impeller after moving along the axial direction, further, the axial height value of the surface of the centrifugal impeller at the contact position is transferred to a conversion reference surface 1211 outside the centrifugal impeller, the guide rod 121 drives the measurement plate 122 to move along the axial direction, and then the overhanging end of the measuring plate 122 is abutted with the surface of the centrifugal impeller at the target radius by adopting line contact, to transfer the axial height value at the target radius of the centrifugal impeller to the conversion reference surface 1211 outside the centrifugal radius, the axial dimension value between the surface at the target radius of the centrifugal impeller and the reference plane of the tie rod is then obtained by measuring the distance between the conversion reference plane 1211 and the reference plane of the tie rod.
The measuring device 10 of the present invention includes a positioning base 11 and a measuring base 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 compressor rotor assembly is centered through the positioning seat 11, so that the compressor rotor assembly and the positioning assembly are coaxially arranged, and the measuring 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 can be matched to slide without clearance; the measuring seat 12 comprises a guide rod 121 and a measuring plate 122, the measuring plate 122 is arranged on the guide rod 121 in an overhanging manner, the guide rod 121 is arranged on the positioning seat 11 in an axially sliding manner, a conversion reference surface 1211 which is arranged in parallel with the axial reference 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 moving along the axial direction, further, the axial height value of the surface of the centrifugal impeller at the contact position is transferred to the conversion reference surface 1211 outside the centrifugal impeller, the distance value between the position where the measuring plate 122 is used for being in line contact with the surface of the centrifugal impeller and the axial line of the positioning seat 11 is equal to the value of the target radius, and further, the axial size value between the surface at the target radius of the centrifugal impeller and the reference surface of the pull rod is conveniently measured from the outer side of the compressor rotor assembly, the measuring efficiency is high.
It can be understood that, in the present embodiment, in order to accurately measure the axial distance value between the surface of the centrifugal impeller of the compressor rotor assembly at the target radius and the reference surface of the tie rod, the reference surface of the tie rod adopts the end surface of the tie rod at the journal position, the measuring plate 122 is used for adopting line contact with the surface of the centrifugal impeller, and the distance value between the position of the line contact and the axis line of the positioning seat 11 is equal to the value of the target radius. In the present invention, the target radius may have a value of 118 mm. The radius value is the place where the design requires the radius r of the centrifugal impeller 118 and the outer cover r of the centrifugal impeller 118 of the object to measure the axial clearance, and the axial clearance between the two parts needs to be ensured by assembly so as to prevent the rotor and the stator from being scraped and abraded.
It will be appreciated that the reference surface of the tie rod may also be the end surface of the end of the tie rod remote from the centrifugal impeller. The position where the measurement plate 122 comes into line contact with the surface of the centrifugal impeller at the target radius may be in parallel with and on the same plane as the conversion reference surface 1211, or may be in parallel with and on a different plane from the conversion reference surface 1211.
Further, as shown in fig. 3 and 4, the measurement board 122 includes a connection plate 1221 extending radially outward of the guide rod 121 and a measurement head 1222 extending axially downward of the guide rod 121, the connection plate 1221 is cantilevered on the top of the guide rod 121, a first end of the connection plate 1221 is fixedly connected to the guide rod 121, a measurement head 1222 is hung on a second end of the connection plate, and the measurement head 1222 is gradually contracted from top to bottom in the axial direction of the measurement base 12 until the measurement head 1222 is contracted into a straight line at the lowest horizontal position. According to the invention, the lowest horizontal position of the measuring head 1222 is contracted into a straight line, so that the lowest point of the measuring head 1222 and the target radius of the blade of the centrifugal impeller can be conveniently contacted in place, the measuring head 1222 is gradually contracted from top to bottom along the axial direction of the measuring seat 12, the position possibly forming obstruction can be judged according to the curved surface condition of the blade of the centrifugal impeller, and the measuring head 1222 is further contracted from top to bottom, so that the measuring head 1222 and the blade of the centrifugal impeller are prevented from generating interference near the contact position to influence the measuring accuracy. The measuring plate 122 is arranged along the radial direction, the measuring head 1222 is arranged along the axial direction, and then when the measuring head is used for measuring the axial distance value between the surface of the target radius of the centrifugal impeller and the reference surface of the pull rod, the measuring head is arranged along the surface of the blade perpendicular to the centrifugal impeller, whether the measuring head is attached to the surface of the blade of the centrifugal impeller or not can be observed conveniently from the outer side, and the accuracy of the measuring result and the convenience of operation are guaranteed.
Further, in order to eliminate errors and facilitate the fabrication of the structure, the measuring head 1222 has a semicircular or inverted triangular shape in an axial cross section.
Further, in order to obtain the axial distance value between the surface of the centrifugal impeller of the compressor rotor assembly at the target radius and the reference surface of the tie rod by directly obtaining the measurement result, the conversion reference surface 1211 is located on the end surface of the guide rod 121 close to one end of the measurement plate 122.
Further, in order to facilitate simultaneous measurement from a plurality of corresponding target radii, the number of the measuring seats 12 is plural, and the plurality of measuring seats 12 are uniformly arranged along the circumferential direction of the positioning seat 11 at intervals. In the invention, the plurality of independent measuring seats 12 are arranged for simultaneous measurement, so that the degree of fit of the positioning seat 11 and the compressor rotor assembly can be observed conveniently from a plurality of directions, the positioning seat 11 and the compressor rotor assembly are completely matched before measurement, 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 measuring head 1222 has a width dimension value of 28 mm to 30 mm. Optionally, the measuring head 1222 has a width dimension of 30mm, so as to ensure that the measuring head overlaps the blade on one side of the centrifugal impeller and is perpendicular to the blade to be measured, thereby ensuring that the measured data is accurate.
Further, as shown in fig. 5, the positioning seat 11 includes a sleeve 111 for being inserted into and fitted with the pull rod to radially position the pull rod, a lower mounting plate 112 provided at the bottom of the sleeve 111 for supporting the pull rod, and an upper mounting plate 113 provided at the top of the sleeve 111 for being engaged with the end teeth of the centrifugal impeller to circumferentially position the centrifugal impeller, a 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 measurement seat 12 is 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. Optionally, the upper mounting plate 113 and the lower mounting plate 112 are flat plates.
Further, the measuring device 10 further includes a bushing 13 for supporting the measuring seat 12 on the upper mounting plate 113, the bushing 13 is disposed on the upper mounting plate 113, the guide rod 121 axially passes through the bushing 13 and is slidably disposed on the upper mounting plate 113, the measuring head 1222, the connecting plate 1221 and the guide rod 121 enclose a recess 1223 with a downward opening, the measuring plate 122 is clamped on the top of the bushing 13 by moving the guide rod 121 axially, and the bushing 13 supports the measuring head 1222 from one end of the measuring head 1222 to prevent the measuring head 1222 from being damaged. By arranging the bushing 1313, when the measuring device 10 is not used, the bushing 1312 props the connecting plate 1221, so that the measuring head 1222 is suspended above the upper mounting plate 113, the measuring head 1222 is prevented from contacting the upper mounting plate 113, the measuring head 1222 is prevented from being damaged, and the service life and the measuring precision of the measuring head 1222 are improved.
Furthermore, a guide hole arranged along the axial direction is formed in the upper mounting plate 113, the guide rod 121 is inserted into the guide hole along the axial direction, one end of the guide rod 121 far away from the measuring plate 122 penetrates through the guide hole, and a mounting hole for mounting a limit pin is formed in the penetrating end of the guide rod 121. Through set up the mounting hole on guide rod 121 and plug-in fitting spacer pin, avoid guide rod 121 upwards to deviate from last mounting panel 113 along the axial, avoid measuring seat 1212 to lose.
Further, the measuring device 10 further includes a circumferential positioning portion for performing circumferential positioning on the measuring base 12, a positioning groove arranged along the axial direction is concavely arranged on the circumferential outer wall surface of the measuring rod, a corresponding positioning hole is arranged on the upper mounting plate 113, the positioning hole and the positioning groove are arranged along the axial direction, the first end of the circumferential positioning portion is clamped into the positioning hole along the axial direction, the second end of the circumferential positioning portion is clamped into the positioning groove along the axial direction, and then the measuring rod is circumferentially positioned. Through setting up circumference location portion, avoid measuring the relative positioning seat 1111 of seat 1212 and follow circumferential direction when measuring, be favorable to improving measurement accuracy.
Referring to fig. 6, the measuring device 10 of the present invention, when the measurement is not needed, only the bushing 13 is needed to support the measuring base 12 on the upper mounting plate 113; when measurement is needed, the measuring base 12 is rotated to enable the measuring head 1222 of the measuring base 12 to avoid the compressor rotor assembly, then, the compressor rotor assembly is assembled on the positioning base 11, the compressor rotor assembly is centered through the positioning base 11, then, the measuring base 12 is lifted upwards along the vertical direction to enable the lowest position of the measuring head of the measuring base 12 to be higher than the impeller surface of the centrifugal impeller, the measuring head 1222 cannot be pulled out from the upper mounting plate 113 under the action of the limiting pin, the measuring base 12 is rotated again, the measuring base 12 is enabled to be arranged right opposite to the compressor rotor assembly, circumferential positioning is conducted on the measuring base 12 through the circumferential positioning portion, finally, the measuring base 12 descends along the axial direction and enables the measuring head 1222 to be abutted to the surface of the blade of the centrifugal impeller, and the axial distance value between the conversion reference surface 1211 and the reference surface is obtained.
Preferably, referring to fig. 7, in another embodiment of the present invention, the surface of the measuring head 1222 is opened with a local concave structure for avoiding the peripheral structure during the measurement process to ensure that the lowest level of the measuring head 1222 is in line contact with and coincident with the blade contact position of the centrifugal impeller. The local recess is designed as a ball socket 1222a, so that the line at the lowest position of the measuring head 1222 can be brought into position with the blade contact position line of the centrifugal impeller. The portion that may form the obstacle is determined according to the profile characteristics of the blades of the centrifugal impeller, and thus the ball 1222a is designed at the portion that forms the obstacle, so that the accuracy of measurement is ensured during the actual measurement process. The section formed by the spherical segment 1222a is spaced from the axis of the measuring head 1222, so that the measuring head 1222 and the blade of the centrifugal impeller can be conveniently observed 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; assembling a compressor rotor assembly to the positioning seat 11; the measuring base 12 is guided by the positioning base 11 to move axially until the measuring base 12 abuts against the blades of the centrifugal impeller; an axial distance value between the conversion reference surface 1211 and the reference surface is obtained, and thus an axial dimension value between the surface at the target radius of the centrifugal impeller and the reference surface of the tie rod is obtained.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement 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 is used for measuring an axial distance value between a surface of 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, and is 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 gas compressor rotor assembly to be measured from the bottom of the gas compressor rotor assembly to be measured and is used as an axial reference surface for measurement, the positioning seat (11) is used for positioning and assembling the gas compressor rotor assembly to be measured so as to center the gas compressor rotor assembly to be measured, the gas 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 arranged on the guide rod (121) in an overhanging manner, the guide rod (121) is arranged on the positioning seat (11) in an axially slidable manner, a conversion reference surface (1211) parallel to the axial reference surface is arranged on the guide rod (121), the overhanging end of the measuring plate (122) is used for being abutted to the surface of the target radius of the centrifugal impeller in a line contact manner so that the measuring plate (122) is positioned on the surface of the centrifugal impeller after moving axially, and further the axial height value of the surface of the centrifugal impeller at the abutted position is transferred to the conversion reference surface (1211) outside the centrifugal impeller,
the guide rod (121) drives the measuring plate (122) to move axially, so that the cantilever end of the measuring plate (122) is in line contact and abutted with the surface of the target radius of the centrifugal impeller, 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 reference surface of the pull rod is obtained by measuring the distance between the conversion reference surface (1211) and the reference surface of the pull rod.
2. The measuring device of claim 1,
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 arranged at the top (121) of the guide rod in a cantilevered mode, a first end of the connecting plate (1221) is fixedly connected with the guide rod (121), and the measuring head (1222) is hung at a second end of the connecting plate,
the measuring head (1222) is gradually contracted from top to bottom along the axial direction of the measuring seat (12) until the measuring head is contracted into a straight line at the lowest horizontal position.
3. The measurement device of claim 2,
the measuring head (1222) is semicircular or inverted triangular in shape in axial section.
4. The measurement device of claim 2,
the conversion reference surface (1211) is located on an end surface of the guide rod (121) near one end of the measurement plate (122),
the lowest level position of the measuring head (1222) is on the same plane with the conversion reference surface (1211).
5. The measurement device of claim 2,
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 measurement device of claim 2,
the conversion reference surface (1211) has a surface roughness of not more than 0.4 μm.
7. The measurement device of claim 2,
the measuring head (1222) has a width dimension value of 28 mm to 30 mm.
8. The measurement device of claim 2,
the positioning seat (11) comprises a sleeve (111) which is used for being inserted and matched with the pull rod to radially position the pull rod, a lower mounting plate (112) which is arranged at the bottom of the sleeve (111) and used for supporting the pull rod, and an upper mounting plate (113) which is 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, wherein 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 base (12) is axially slidably arranged on the upper mounting plate (113).
9. The measurement device of claim 8,
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 as claimed in any one of claims 1 to 9, comprising the steps of;
assembling a compressor rotor assembly to the positioning seat (11);
the measuring seat (12) is axially moved under the guidance of the positioning seat (11) until the measuring seat (12) is abutted against the blade of the centrifugal impeller;
an axial distance value between the conversion reference surface (1211) and the reference surface is obtained, and an axial dimension value between the surface at the target radius of the centrifugal impeller and the reference surface of the tie rod 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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| 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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| CN113532237B CN113532237B (en) | 2023-05-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116538979A (en) * | 2023-07-06 | 2023-08-04 | 常州市奥威机械有限公司 | Dimension measurement tool based on multi-specification turbine blade machining |
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