CN115451784A - Method for measuring sealing clearance of rotor in closed space - Google Patents

Method for measuring sealing clearance of rotor in closed space Download PDF

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Publication number
CN115451784A
CN115451784A CN202211027474.6A CN202211027474A CN115451784A CN 115451784 A CN115451784 A CN 115451784A CN 202211027474 A CN202211027474 A CN 202211027474A CN 115451784 A CN115451784 A CN 115451784A
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CN
China
Prior art keywords
rotor
tool shaft
measuring
sealing
stator
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Pending
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CN202211027474.6A
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Chinese (zh)
Inventor
王水霞
郑君君
赵晓京
王官洪
王豆豆
门宏伟
刘俊红
杜昌雄
洪静
李琳玲
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Xian Shaangu Power Co Ltd
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Xian Shaangu Power Co Ltd
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Publication date
Application filed by Xian Shaangu Power Co Ltd filed Critical Xian Shaangu Power Co Ltd
Priority to CN202211027474.6A priority Critical patent/CN115451784A/en
Publication of CN115451784A publication Critical patent/CN115451784A/en
Pending legal-status Critical Current

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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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)

Abstract

The invention discloses a method for measuring a sealing gap of an inner rotor in a closed space, which mainly solves the technical problem that the measuring result of the sealing gap of the inner rotor in the closed space is inaccurate in the prior art. Measuring the diameter of the part, matched with the stator sealing sheet, on the rotor; measuring the inner diameter of a stator sealing sheet; calculating the average clearance between the rotor and the stator sealing sheet along the radial direction; installing a tool shaft, and adjusting the axial position of the tool shaft to coaxially replace a rotor for measurement; measuring the radial distances between four positions on the peripheral surface of the tool shaft and the corresponding stator sealing sheets respectively; calculating the eccentricity of the tool shaft and the stator sealing sheet in the radial direction at the first position and the second position and the eccentricity of the tool shaft and the stator sealing sheet in the radial direction at the third position and the fourth position; converting a sealing clearance value of the rotor; and judging whether the sealing clearance value is within the designed sealing clearance tolerance range.

Description

Method for measuring sealing clearance of rotor in closed space
Technical Field
The invention relates to a method for measuring a sealing gap, in particular to a method for measuring a sealing gap of an inner rotor in a closed space.
Background
In compressor, tail gas expander, in order to satisfy the performance requirement of unit, often be equipped with the sealing member between rotor and stator, in order to guarantee when the rotor rotates and the sealing member does not take place to bump and grind and the leakproofness requirement, the clearance that sets up between stator sealing member and rotor has certain requirement, consequently, in the installation, in order to guarantee that the sealing clearance of rotor reaches the design requirement, need measure the sealing clearance of rotor to detect whether it satisfies technical requirement.
Due to the structural limitation of the rotor, after the rotor is installed, a sealing gap measuring part of the rotor is located in a closed space formed by the rotor and the stator, and manual direct measurement cannot be performed through a measuring instrument.
Disclosure of Invention
The invention aims to solve the technical problem that the measurement result of the sealing gap of the rotor in the closed space is inaccurate in the prior art, and provides a method for measuring the sealing gap of the rotor in the closed space.
A method for measuring a sealing gap of an inner rotor in a closed space is characterized by comprising the following steps:
step 1, measuring the diameter d of a part, matched with a stator sealing sheet, on a rotor;
measuring the inner diameter D of the stator sealing sheet;
calculating the average radial clearance e between the rotor and stator sealing sheets Average ；
e Average ＝(D-d)/2；
Step 2, installing a tool shaft, and adjusting the axial position of the tool shaft to coaxially replace a rotor for measurement;
step 3, defining the outer circumferential surface of the tool shaft to be provided with a first position, a second position, a third position and a fourth position, wherein the radial distance between the first position and the second position and the radial distance between the third position and the fourth position are equal to the diameter of the tool shaft, and the radial connecting line of the first position and the second position is vertical to the radial connecting line of the third position and the fourth position;
measuring the radial distances between the first position, the second position, the third position and the fourth position and the corresponding stator sealing sheet respectively, and respectively recording the distances as f1, f2, f3 and f4;
step 4, calculating the eccentricity fa of the tool shaft and the stator sealing piece in the radial direction at the first position and the second position and the eccentricity fb of the tool shaft and the stator sealing piece in the radial direction at the third position and the fourth position;
step 5, converting the sealing clearance value of the rotor;
defining the outer circumferential surface of the rotor to have a fifth position, a sixth position, a seventh position and an eighth position, wherein the fifth position corresponds to the first position, the sixth position corresponds to the second position, the seventh position corresponds to the third position, and the eighth position corresponds to the fourth position;
seal clearance value e5 at fifth position: e5= e Average out +fa；
Seal clearance value e6 at sixth position: e6= e Average -fa；
Seal clearance value e7 at the seventh position: e7= e Average +fb；
Value of seal clearance e8 at eighth position: e8= e Average -fb；
Step 6, judging whether e5, e6, e7 and e8 are all within the designed tolerance range of the sealing clearance, if so, finishing the measurement; if not, returning to the step 2 until e5, e6, e7 and e8 are all within the designed tolerance range of the sealing gap.
Further, in step 4, the eccentricities fa and fb satisfy the following equations:
fa＝(f1-f2)/2，fb＝(f3-f4)/2。
further, in step 2, the seal clearance values of the first position, the second position, the third position and the fourth position on the tool shaft are determined according to the measured coaxiality deviation of the tool shaft and the stator sealing piece (the tool shaft and the rotor are supported at the same time, namely the coaxiality of the tool shaft and the rotor and the stator sealing piece is consistent).
Furthermore, the coaxiality of the tool shaft and the stator sealing sheet is less than or equal to 0.05mm; if the coaxiality of the tool shaft 3 and the stator sealing sheet 2 is more than 0.05mm, the position of the tool shaft 3 is adjusted by the adjusting support.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the rotor is coaxially replaced by the tool shaft, the sealing clearance value during actual installation of the rotor is obtained by measuring the clearance between the tool shaft and the stator sealing sheet, measuring the eccentricity of the tool shaft and combining the actual measurement average clearance between the rotor and the stator sealing sheet, the indirect measurement of the clearance between the stator sealing element and the rotor is realized, the problem that the sealing clearance cannot be measured because the rotor is directly installed by the existing equipment is solved, and the measuring method is simple and accurate.
Drawings
FIG. 1 is a schematic view of a tool shaft and a stator sealing piece along the axial direction;
FIG. 2 is a schematic view of the radial arrangement of the tooling shaft and stator seal segments;
fig. 3 is a schematic structural view of rotor and stator sealing plates.
In the figure, 1 is a rotor, 2 is a stator sealing sheet, and 3 is a tooling shaft.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
In the description of the present invention, it should be noted that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Due to the structural characteristics of the rotor 1, when the rotor 1 is installed on a stator, a relatively closed sealing space is formed at the matching part of the rotor 1 and the stator sealing sheet 2, so that in order to measure the gap between the rotor 1 and the stator sealing sheet 2, the invention adopts the step-free cylindrical tool shaft 3 to coaxially replace the rotor 1 for measurement.
The invention relates to a method for measuring a sealing gap of a rotor in a closed space, which is implemented according to the following steps:
step 1, measuring the diameter d of a part, matched with a stator sealing sheet 2, on a rotor 1; measuring the inner diameter D of the opposite stator sealing sheet 2; the measurement positions of D and D are shown in FIG. 3;
calculating the average gap e between the rotor 1 and the stator sealing sheet 2 along the radial direction Average out ；
e Average out ＝(D-d)/2；
Step 2, installing the tool shaft 3, wherein the structure and the installation position of the tool shaft 3 are shown in fig. 1, and determining the sealing clearance values of the first position, the second position, the third position and the fourth position on the tool shaft 3 according to the measured coaxiality deviation of the tool shaft 3 and the stator sealing sheet 2, (the tool shaft 3 and the rotor 1 are supported together, namely the coaxiality of the tool shaft 3 and the stator sealing sheet 2 is equal to that of the rotor 1 and the stator sealing sheet 2), and the tool shaft 3 and the rotor 1 are used for coaxially replacing the rotor 1 for measurement, the coaxiality of the tool shaft 3 and the stator sealing sheet 2 is less than or equal to 0.05mm, and if the coaxiality of the tool shaft 3 and the stator sealing sheet 2 is greater than 0.05mm, the support is adjusted to adjust the position of the tool shaft 3.
Step 3, defining that the outer circumferential surface of the tool shaft 3 has a first position, a second position, a third position and a fourth position, wherein the radial distance between the first position and the second position and the radial distance between the third position and the fourth position are equal to the diameter of the tool shaft 3, and the radial connecting line between the first position and the second position is perpendicular to the radial connecting line between the third position and the fourth position, in this embodiment, with the viewing angle shown in fig. 2 as a reference, the first position, the second position, the third position and the fourth position are respectively the upper side position, the lower side position, the left side position and the right side position of the tool shaft 3 in the radial direction; in other embodiments of the present invention, the measurement positions may be set to six, eight, ten, etc., and may be selected according to specific measurement accuracy requirements, and in consideration of the complexity of the calculation and the relatively good calculation accuracy, four measurement positions are preferred in this embodiment.
Measuring the radial distance between the first position and the corresponding stator sealing piece 2 (with the minimum distance), recording the radial distance as f1, measuring the radial distance between the second position and the corresponding stator sealing piece 2, recording the radial distance as f2, measuring the radial distance between the third position and the corresponding stator sealing piece 2, recording the radial distance as f3, measuring the radial distance between the fourth position and the corresponding stator sealing piece 2, and recording the radial distance as f4;
step 4, calculating the eccentricity fa and the eccentricity fb of the tool shaft 3 and the stator sealing piece 2 at the first position and the second position in the direction of the radial connecting line, and at the third position and the fourth position in the direction of the radial connecting line;
fa＝(f1-f2)/2，fb＝(f3-f4)/2；
step 5, converting the sealing clearance value of the outer circumferential surface of the rotor 1;
the outer circumferential surface of the rotor 1 is defined to have a fifth position, a sixth position, a seventh position and an eighth position, and the rotor 1 and the tooling shaft 3 are on the same axis and have only a difference in diameter, so in the embodiment, the fifth position corresponds to the first position, the sixth position corresponds to the second position, the seventh position corresponds to the third position, and the eighth position corresponds to the fourth position, that is, the fifth position is on an extension line of the first position in the radial direction, the sixth position is on an extension line of the second position in the radial direction, the seventh position is on an extension line of the third position in the radial direction, and the eighth position is on an extension line of the fourth position in the radial direction; in other embodiments of the present invention, the number of the measurement positions on the outer circumferential surface of the rotor 1 is set to be equal to the number of the measurement positions on the tool shaft, i.e., six, eight, ten, etc., and the corresponding relationship is satisfied.
Seal clearance value at fifth position: e5= e Average +fa；
Seal clearance value at sixth position: e6＝e Average out -fa；
Seal clearance value at the seventh position: e7= e Average +fb；
Value of seal clearance at eighth position: e8= e Average -fb；
Step 6, judging whether e5, e6, e7 and e8 are within a designed tolerance range of the sealing gap or not, (the sizes of e5, e6, e7 and e8 can be judged, and only the maximum value and the minimum value can be compared) if so, finishing measurement; if not, returning to the step 2 until e5, e6, e7 and e8 are all within the designed tolerance range of the sealing gap.

Claims (4)

1. A method for measuring a sealing gap of an inner rotor in a closed space is characterized by comprising the following steps:
step 1, measuring the diameter d of the part, matched with the stator sealing sheet (2), of the rotor (1);
measuring the inner diameter D of the stator sealing sheet (2);
calculating the average radial clearance e between the rotor (1) and the stator sealing sheet (2) Average ；
e Average out ＝(D-d)/2；
Step 2, installing a tool shaft (3), adjusting the axial position of the tool shaft (3) and coaxially replacing the rotor (1) for measurement;
step 3, defining that the outer circumferential surface of the tool shaft (3) is provided with a first position, a second position, a third position and a fourth position, wherein the radial distance between the first position and the second position and the radial distance between the third position and the fourth position are equal to the diameter of the tool shaft (3), and the radial connecting line of the first position and the second position is perpendicular to the radial connecting line of the third position and the fourth position;
measuring the radial distances between the first position, the second position, the third position and the fourth position and the corresponding stator sealing sheet (2), and respectively recording the distances as f1, f2, f3 and f4;
step 4, calculating the eccentricity fa of the tool shaft (3) and the stator sealing piece (2) in the radial direction at the first position and the second position and the eccentricity fb of the tool shaft and the stator sealing piece in the radial direction at the third position and the fourth position;
step 5, converting the sealing clearance value of the rotor (1);
defining the outer circumferential surface of the rotor (1) to have a fifth position, a sixth position, a seventh position and an eighth position, the fifth position, the sixth position, the seventh position and the eighth position corresponding to the first position, the second position, the third position and the fourth position, respectively;
seal clearance value e5 at fifth position: e5= e Average +fa；
Seal clearance value e6 at sixth position: e6= e Average -fa；
Seal clearance value e7 at the seventh position: e7= e Average out +fb；
Value of seal clearance e8 at eighth position: e8= e Average out -fb；
Step 6, judging whether e5, e6, e7 and e8 are all within the designed tolerance range of the sealing gap, if so, finishing the measurement; if not, returning to the step 2 until e5, e6, e7 and e8 are all within the designed tolerance range of the sealing gap.
2. The method for measuring the sealing gap of the rotor in the closed space according to the claim 1, is characterized in that:
in step 4, the calculation formulas of the eccentricity fa and fb are as follows:
fa＝(f1-f2)/2，fb＝(f3-f4)/2。
3. a method of measuring a seal gap of a rotor in a closed space according to claim 2, wherein:
and step 2, determining the sealing clearance values of the first position, the second position, the third position and the fourth position on the tool shaft (3) according to the coaxiality deviation of the measuring tool shaft (3) and the stator sealing sheet (2).
4. A method of measuring a seal gap in a rotor in an enclosed space according to any of claims 1 to 3, wherein:
the coaxiality of the tool shaft (3) and the stator sealing sheet (2) is less than or equal to 0.05mm.
CN202211027474.6A 2022-08-25 2022-08-25 Method for measuring sealing clearance of rotor in closed space Pending CN115451784A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211027474.6A CN115451784A (en) 2022-08-25 2022-08-25 Method for measuring sealing clearance of rotor in closed space

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211027474.6A CN115451784A (en) 2022-08-25 2022-08-25 Method for measuring sealing clearance of rotor in closed space

Publications (1)

Publication Number Publication Date
CN115451784A true CN115451784A (en) 2022-12-09

Family

ID=84299573

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211027474.6A Pending CN115451784A (en) 2022-08-25 2022-08-25 Method for measuring sealing clearance of rotor in closed space

Country Status (1)

Country Link
CN (1) CN115451784A (en)

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