CN114234771B - Engine air gap measuring device and measuring method - Google Patents
Engine air gap measuring device and measuring method Download PDFInfo
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- CN114234771B CN114234771B CN202111327782.6A CN202111327782A CN114234771B CN 114234771 B CN114234771 B CN 114234771B CN 202111327782 A CN202111327782 A CN 202111327782A CN 114234771 B CN114234771 B CN 114234771B
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- thimble
- air gap
- rectangular groove
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- slideway
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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
- G01B5/003—Measuring of motor parts
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- General Physics & Mathematics (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention provides an engine air gap measuring device which comprises a base provided with a rectangular groove, a thimble, a chute and a plurality of gaskets, wherein the bottom surface of the base is provided with a salient point, the side wall of the rectangular groove, which is far away from the salient point, is provided with a chute penetrating through the side wall, the thimble is in sliding connection with the chute, one end of the thimble, which is positioned in the rectangular groove, is in an arc shape, the opening edge of one end of the chute is fixedly connected with the opening edge of the rectangular groove, the inner cavity of the chute is communicated with the rectangular groove, and the plurality of gaskets are positioned in the chute and are in sliding connection with the chute. The invention can measure the highest point of the magnetic pole at the middle position of the generator and the air gap value between the stator cores, solves the problem that the air gap value is easy to have errors and the accuracy is to be improved when the existing wooden wedge pressing method is adopted to measure the air gap value, and improves the measurement accuracy of the air gap value. Correspondingly, the invention further provides an engine air gap measuring method.
Description
Technical Field
The invention relates to the technical field of generators, in particular to an engine air gap measuring device and an engine air gap measuring method.
Background
The size of the air gap of the hydroelectric generating set has direct influence on the running performance, technical and economic indexes and the like of the set, and the gap measurement obtains the minimum distance between the highest point of the magnetic pole and the stator core, so that the air gap measurement needs to be accurate.
At present, the air gap is measured by a wood wedge pressing method, namely, a wooden or steel bevel rule is adopted, a display agent is coated on the surface of the bevel rule, then the bevel rule is inserted between the highest points of magnetic poles of a stator and a rotor, the bevel rule is pulled out when the bevel rule is not inserted, and the thickness of the bevel rule at the position with scratches is measured by a vernier caliper or an outside micrometer to obtain the air gap value.
When the air gap value is measured by the wood wedge pressing method, the bevel ruler cannot penetrate into the middle part of the generator, the measured gap value between the magnetic pole end pressing plate and the iron core pressing plate is often the gap value between the magnetic pole and the iron core, and the air gap value measured by the wood wedge pressing method is not the actual gap value, so that errors are easy to occur, and the accuracy is required to be improved.
Disclosure of Invention
Based on the above, in order to solve the problem that the existing method for measuring the air gap value by adopting the wood wedge pressing method is easy to cause errors and the accuracy is to be improved, the invention provides an engine air gap measuring device and an engine air gap measuring method, and the specific technical scheme is as follows:
an engine air gap measuring device comprises a base provided with a rectangular groove, a thimble, a chute and a plurality of gaskets.
The bottom surface of the base is provided with convex points, and the side wall of the rectangular groove far away from the convex points is provided with a slideway penetrating through the side wall; the thimble is in sliding connection with the slideway, and one end of the thimble, which is positioned in the rectangular groove, is arc-shaped.
The opening edge of one end of the chute is fixedly connected with the opening edge of the rectangular groove, and the inner cavity of the chute is communicated with the rectangular groove.
The plurality of gaskets are positioned in the sliding groove and are in sliding connection with the sliding groove.
By pushing a plurality of gaskets into the rectangular grooves one by one, the extending length of the other end of the thimble on the slideway can be increased continuously.
Firstly, inserting the base into the middle position of the generator, enabling the salient points to be abutted against the highest point of the magnetic poles or the stator core, and then adjusting the extending length of the other end of the thimble on the slideway. When the other end of the thimble and the salient point are respectively contacted with the highest magnetic pole point at the middle position of the generator and the stator core, the distance between the other end of the thimble and the salient point is the air gap value between the magnetic pole of the generator and the stator core.
Because the base is inserted to the middle position of the generator and is positioned between the highest magnetic pole point and the stator core, the air gap value between the highest magnetic pole point and the stator core at the middle position of the generator can be measured through the measuring device, the problem that the air gap value is easy to error due to the fact that a wooden wedge pressing method is adopted in the prior art is solved, the accuracy is to be improved, and the measuring accuracy of the air gap value is improved.
Further, the width of the gasket is equal to that of the rectangular groove, and one end of the gasket, which is close to the rectangular groove, is arc-shaped.
Further, the gasket is made of stainless steel sheet.
Further, the stainless steel sheet has a thickness of 1mm.
Further, the stainless steel sheet has a thickness of 0.1mm.
Further, the stainless steel sheet has a thickness of 0.05mm.
An engine air gap measurement method comprising the steps of:
inserting a measuring device between a magnetic pole and an iron core of the engine, and recording the position of the measuring device between the magnetic pole and the iron core of the engine as a measuring point;
sequentially pushing the gaskets closest to the bottom surface of the rectangular groove into the rectangular groove to gradually increase the extension length of the other end of the thimble on the slideway;
when the gasket cannot be pushed into the rectangular groove any more, the measuring device is taken out;
measuring the distance between the other end of the thimble and the salient point, wherein the distance is the air gap value of the measuring point;
the measuring device comprises a base provided with a rectangular groove, a thimble, a chute and a plurality of gaskets.
The bottom surface of the base is provided with convex points, and the side wall of the rectangular groove far away from the convex points is provided with a slideway penetrating through the side wall; the thimble is in sliding connection with the slideway, and one end of the thimble, which is positioned in the rectangular groove, is arc-shaped.
The opening edge of one end of the chute is fixedly connected with the opening edge of the rectangular groove, and the inner cavity of the chute is communicated with the rectangular groove.
The plurality of gaskets are positioned in the sliding groove and are in sliding connection with the sliding groove.
The base of the measuring device is inserted into the middle position of the generator and is positioned between the highest point of the magnetic pole and the stator core, so that the distance between the other end of the thimble and the salient point is the air gap value of the measuring point.
That is, by the measuring method, the air gap value between the highest magnetic pole point of the middle position of the generator and the stator core can be measured, the problem that the air gap value is easy to have errors and the accuracy is to be improved when the existing wood wedge pressing method is adopted to measure the air gap value is solved, and the measuring accuracy of the air gap value is improved.
Further, a vernier caliper is used for measuring the distance between the other end of the thimble and the salient point.
Further, the width of the gasket is equal to that of the rectangular groove, and one end of the gasket, which is close to the rectangular groove, is arc-shaped.
Further, the gasket is made of a stainless steel sheet having a thickness of 1mm, 0.1mm or 0.05mm.
Drawings
The invention will be further understood from the following description taken in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. Like reference numerals designate corresponding parts throughout the different views.
FIG. 1 is a schematic diagram of an overall structure of an engine air gap measurement device according to an embodiment of the present invention;
FIG. 2 is a schematic overall flow chart of an engine air gap measurement method according to an embodiment of the invention.
Reference numerals illustrate:
1. a base; 2. a thimble; 3. a chute; 4. a gasket; 5. a bump; 6. rectangular grooves.
Detailed Description
The present invention will be described in further detail with reference to the following examples thereof in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The terms "first" and "second" in this specification do not denote a particular quantity or order, but rather are used for distinguishing between similar or identical items.
As shown in fig. 1, an engine air gap measuring device according to an embodiment of the present invention includes a base 1 provided with a rectangular groove 6, a thimble 2, a chute 3, and a plurality of gaskets 4.
The bottom surface of the base 1 is provided with convex points 5, and the side wall of the rectangular groove 6 far away from the convex points 5 is provided with a slideway penetrating through the side wall; the thimble 2 is in sliding connection with the slideway, and one end of the thimble 2, which is positioned in the rectangular groove 6, is arc-shaped.
The opening edge of one end of the chute 3 is fixedly connected with the opening edge of the rectangular groove 6, and the inner cavity of the chute 3 is communicated with the rectangular groove 6. That is, one end opening edge of the chute 3 is engaged with the opening edge of the rectangular groove 6. Preferably, the base 1 is integrally formed with the chute 3.
A plurality of gaskets 4 are positioned in the sliding groove 3 and are in sliding connection with the sliding groove 3.
Specifically, the gasket 4 is elongated, and the chute 3 is square. When the base 1 is inserted between the magnetic pole of the middle part of the generator and the stator core, at least part of the chute 3 is positioned outside the generator. In this way, it is convenient for the technician to push the spacer 4 into the rectangular recess 6 and insert at least a portion of the spacer 4 between one end of the thimble 2 and the bottom surface of the rectangular recess 6.
The salient points 5, the thimble 2 and the axial leads of the slideway are mutually overlapped.
The gasket 4 can be made of stainless steel sheets, and the thickness of the stainless steel sheets can be adjusted and set according to actual needs. As a preferable technical scheme, the thickness specification of the stainless steel sheet can be 1mm, 0.1mm or 0.05mm, etc. That is, a plurality of the gaskets 4 may have one thickness gauge, or more than one thickness gauge may be used in combination and the thickness gauge is large and is located below the thickness gauge. For example, the thickness gauge of the plurality of the spacers 4 includes three kinds, with the spacer 4 of the largest thickness gauge being located at the lowermost and the spacer 4 of the smallest thickness gauge being located at the uppermost. In this way, the extending length of the other end of the thimble 2 can be roughly adjusted by the spacer 4 with the maximum thickness specification, and the extending length of the other end of the thimble 2 can be finely adjusted by the spacer 4 with the minimum thickness specification. The coarse adjustment and the fine adjustment are combined, so that the extension length of the other end of the thimble 2 can be quickly and accurately adjusted, and the measuring efficiency of the air gap of the generator is improved.
By pushing a plurality of gaskets 4 into the rectangular grooves 6 one by one, the extension length of the other end of the thimble 2 on the slideway can be increased continuously.
Firstly, the base 1 is inserted into the middle position of the generator, the salient point 5 is abutted against the highest point of the magnetic pole or the stator core, and then the extension length of the other end of the thimble 2 on the slideway is adjusted. When the other end of the thimble 2 and the salient point 5 are respectively contacted with the highest magnetic pole point at the middle position of the generator and the stator core, the distance between the other end of the thimble 2 and the salient point 5 is the air gap value between the magnetic pole of the generator and the stator core.
Because the base 1 is inserted into the middle position of the generator and is positioned between the highest magnetic pole point and the stator core, the air gap value between the highest magnetic pole point and the stator core at the middle position of the generator can be measured through the measuring device, the problem that the air gap value is easy to error due to the fact that a wooden wedge pressing method is adopted in the prior art is solved, the accuracy is to be improved, and the measuring accuracy of the air gap value is improved.
In one embodiment, the width of the spacer 4 is equal to the width of the rectangular groove 6, and one end of the spacer 4, which is close to the rectangular groove 6, is in an arc shape, so that the ejector pin 2 is conveniently lifted up by the spacer 4.
In the present invention, the length dimensions of the groove, the ejector pin 2 and the bump 5 may be adjusted and set according to actual needs, which will not be described herein.
An engine air gap measuring method, as shown in fig. 2, comprises the following steps:
in a first step, a measuring device is inserted between the pole and the core of the motor, and the position of the measuring device between the pole and the core of the motor is recorded as a measuring point.
In the second step, the gaskets 4 closest to the bottom surface of the rectangular groove 6 are sequentially pushed into the rectangular groove 6 to gradually increase the extension length of the other end of the thimble 2 on the slideway.
Third, when the gasket 4 can no longer be pushed into the rectangular recess 6, the measuring device is removed.
And fourthly, measuring the distance between the other end of the thimble 2 and the salient point 5, wherein the distance is the air gap value of the measuring point.
The measuring device comprises a base 1 provided with a rectangular groove 6, a thimble 2, a chute 3 and a plurality of gaskets 4.
The bottom surface of the base 1 is provided with convex points 5, and the side wall of the rectangular groove 6 far away from the convex points 5 is provided with a slideway penetrating through the side wall; the thimble 2 is in sliding connection with the slideway, and one end of the thimble 2, which is positioned in the rectangular groove 6, is arc-shaped. As a preferable embodiment, the other end of the thimble 2 is circular arc or conical, and the bump 5 is circular arc or conical accordingly. Therefore, one end of the thimble 2 can be better and more accurately abutted with the highest point of the magnetic pole at the middle position of the generator, and the convex point 5 can be better and more accurately abutted with the stator core at the middle position of the generator.
It should be noted that, depending on the measurement points, the highest point of the magnetic pole may be located in different directions above, below, left or right of the stator core.
The opening edge of one end of the chute 3 is fixedly connected with the opening edge of the rectangular groove 6, and the inner cavity of the chute 3 is communicated with the rectangular groove 6. When the base 1 is inserted between the magnetic pole of the middle part of the generator and the stator core, at least part of the chute 3 is positioned outside the generator. In this way, it is convenient for the technician to push the spacer 4 into the rectangular recess 6 and insert at least a portion of the spacer 4 between one end of the thimble 2 and the bottom surface of the rectangular recess 6.
A plurality of gaskets 4 are positioned in the sliding groove 3 and are in sliding connection with the sliding groove 3. The gasket 4 is in a strip shape, and the gasket 4 can slide relative to the chute 3. Specifically, a plurality of shims 4 are stacked together in one thickness gauge or in a combination of more than one thickness gauge. When the plurality of gaskets 4 are used in combination of more than one thickness gauge, the thickness gauge is large and is positioned below the thickness gauge. Here, the position of the protruding point 5 is taken as the lower position, and the position of the other end of the thimble 2 is taken as the upper position. In contrast, the protruding point 5 is located below the thimble 2.
Because the base 1 of the measuring device is inserted into the middle position of the generator and is positioned between the highest point of the magnetic pole and the stator core, the distance between the other end of the thimble 2 and the salient point 5 is the air gap value of the measuring point.
That is, by the measuring method, the air gap value between the highest magnetic pole point of the middle position of the generator and the stator core can be measured, the problem that the air gap value is easy to have errors and the accuracy is to be improved when the existing wood wedge pressing method is adopted to measure the air gap value is solved, and the measuring accuracy of the air gap value is improved.
In one embodiment, a vernier caliper or a micrometer is used to measure the distance between the other end of the thimble 2 and the bump 5.
In one embodiment, the width of the spacer 4 is equal to the width of the rectangular groove 6, and one end of the spacer 4 near the rectangular groove 6 is in a circular arc shape, so that the thimble 2 is conveniently padded up by the spacer 4.
In one of the embodiments, the gasket 4 is made of a stainless steel sheet having a thickness of 1mm, 0.1mm or 0.05mm. Preferably, the plurality of cushion blocks are used in combination by adopting different thickness specifications, so that coarse adjustment and fine adjustment are carried out on the extending length of the other end of the thimble 2, and the measuring efficiency of the air gap of the generator is improved.
In one embodiment, the side wall of the slideway is also provided with a slot, a strip resistor is arranged in the slot, the slot is communicated with the slideway, the thimble is provided with a sliding rod perpendicular to the thimble, and one end of the sliding rod is abutted with the strip resistor and is electrically connected with the strip resistor; wherein the thimble is made of insulating material such as plastic, ceramic or glass fiber reinforced plastic, and the sliding rod is made of conductive metal material such as copper; the measuring device further comprises a processor, one ends of the sliding rod and the strip-shaped resistor disc are respectively and electrically connected with the processor through wires, and the resistance value of the strip-shaped resistor disc is in direct proportion to the length. The processor firstly obtains the length of the strip-shaped resistor between the two wires by calculating the resistance between the strip-shaped resistor between the two wires, then calculates the extension length of the thimble relative to the slideway according to the length of the strip-shaped resistor between the two wires, and finally calculates the extension length of the thimble relative to the slideway and the distance between the salient point and the slideway opening according to the length of the strip-shaped resistor between the two wires, and calculates the distance between the salient point and the other end of the thimble, wherein the distance is the air gap value of the measuring point.
Through set up fluting and set up rectangular shape resistance card in the fluting at the lateral wall of slide, utilize the linear proportional relation between resistance value and the length of rectangular shape resistance card between slide bar and the rectangular shape resistance card one end of calculation, can calculate the distance between bump and the thimble other end very conveniently. That is, the measuring device can conveniently measure the air gap value of the generator through the sliding rod and the resistor disc.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. An engine air gap measurement apparatus, comprising:
the base is provided with a rectangular groove, the bottom surface of the base is provided with a convex point, and the side wall of the rectangular groove far away from the convex point is provided with a slideway penetrating through the side wall;
the ejector pin is in sliding connection with the slideway, and one end of the ejector pin, which is positioned in the rectangular groove, is arc-shaped;
the opening edge of one end of the sliding groove is fixedly connected with the opening edge of the rectangular groove, and the inner cavity is communicated with the rectangular groove;
the gaskets are positioned in the sliding groove and are in sliding connection with the sliding groove;
the side wall of the slideway is provided with a slot, a strip-shaped resistor disc is arranged in the slot, the slot is communicated with the slideway, a sliding rod perpendicular to the thimble is arranged on the thimble, and one end of the sliding rod is abutted with the strip-shaped resistor disc and is electrically connected with the strip-shaped resistor disc;
the thimble is made of insulating materials, the sliding rod is made of conductive metal materials, the measuring device further comprises a processor, one ends of the sliding rod and the strip-shaped resistor piece are respectively electrically connected with the processor through wires, the resistance value of the strip-shaped resistor piece is in direct proportion to the length, the processor firstly obtains the length of the strip-shaped resistor piece between the two wires by calculating the resistance value between the strip-shaped resistor piece between the two wires, then calculates the extension length of the thimble relative to a slideway according to the length of the strip-shaped resistor piece between the two wires, finally calculates the extension length of the thimble relative to the slideway and the distance between the salient point and the opening of the slideway according to the length of the strip-shaped resistor piece between the two wires, calculates the distance between the salient point and the other end of the thimble, and takes the distance between the salient point and the other end of the thimble as the air gap value of the measuring point.
2. An engine air gap measuring device as claimed in claim 1 wherein the width of the shim is equal to the width of the rectangular recess, and the end of the shim adjacent the rectangular recess is arcuate.
3. An engine air gap measuring device as claimed in claim 1 wherein said spacer is made of stainless steel sheet.
4. An engine air gap measuring device as claimed in claim 3 wherein said stainless steel sheet has a thickness of 1mm.
5. An engine air gap measuring device as claimed in claim 3 wherein said stainless steel sheet has a thickness of 0.1mm.
6. An engine air gap measuring device as claimed in claim 3 wherein said stainless steel sheet has a thickness of 0.05mm.
7. The engine air gap measuring method is characterized by comprising the following steps of:
inserting a measuring device between a magnetic pole and an iron core of the engine, and recording the position of the measuring device between the magnetic pole and the iron core of the engine as a measuring point;
sequentially pushing the gaskets closest to the bottom surface of the rectangular groove into the rectangular groove to gradually increase the extension length of the other end of the thimble on the slideway;
when the gasket cannot be pushed into the rectangular groove any more, the measuring device is taken out;
measuring the distance between the other end of the thimble and the salient point, wherein the distance is the air gap value of the measuring point;
wherein the measuring device includes:
the base is provided with a rectangular groove, the bottom surface of the base is provided with a convex point, and the side wall of the rectangular groove far away from the convex point is provided with a slideway penetrating through the side wall;
the ejector pin is in sliding connection with the slideway, and one end of the ejector pin, which is positioned in the rectangular groove, is arc-shaped;
the opening edge of one end of the sliding groove is fixedly connected with the opening edge of the rectangular groove, and the inner cavity is communicated with the rectangular groove;
the gaskets are positioned in the sliding groove and are in sliding connection with the sliding groove;
the side wall of the slideway is provided with a slot, a strip resistor is arranged in the slot, the slot is communicated with the slideway, a sliding rod perpendicular to the thimble is arranged on the thimble, and one end of the sliding rod is abutted with the strip resistor and is electrically connected with the strip resistor;
the thimble is made of insulating materials, the sliding rod is made of conductive metal materials, the measuring device further comprises a processor, one ends of the sliding rod and the strip-shaped resistor piece are respectively electrically connected with the processor through wires, the resistance value of the strip-shaped resistor piece is in direct proportion to the length, the processor firstly obtains the length of the strip-shaped resistor piece between the two wires by calculating the resistance value between the strip-shaped resistor piece between the two wires, then calculates the extension length of the thimble relative to a slideway according to the length of the strip-shaped resistor piece between the two wires, finally calculates the extension length of the thimble relative to the slideway and the distance between the salient point and the opening of the slideway according to the length of the strip-shaped resistor piece between the two wires, calculates the distance between the salient point and the other end of the thimble, and takes the distance between the salient point and the other end of the thimble as the air gap value of the measuring point.
8. The method for measuring an engine air gap according to claim 7, wherein a distance between the other end of the thimble and the bump is measured by a vernier caliper.
9. The engine air gap measuring method as set forth in claim 7, wherein a width of the spacer is equal to a width of the rectangular groove, and an end of the spacer adjacent to the rectangular groove is formed in an arc shape.
10. An engine air gap measuring method as claimed in claim 7 wherein the shim is made of stainless steel sheet having a thickness of 1mm, 0.1mm or 0.05mm.
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