CN221571795U - Detection tool - Google Patents

Abstract

The utility model relates to a detection tool for detect the elasticity of slot wedge in the motor stator thorax, including application of force subassembly and detection component, set up the application of force end of application of force subassembly and be suitable for acting on the surface of the slot wedge that needs to detect, make the slot wedge produce the position change in the wire casing, and use the displacement volume that detection component detects the slot wedge and produce the position change, compare the displacement volume that detects with the displacement volume of predetermineeing, be favorable to the accurate detection slot wedge elasticity degree, thereby accurately obtain the degree of loosening of stator bar.

Description

Detection tool

Technical Field

The disclosure relates to the technical field of motor detection tools, in particular to a detection tool for detecting tightness of slot wedges in a motor stator bore.

Background

The stator bar is mainly fixed in the iron core groove by the slot wedge, the stator bar is influenced by the electric force and the mechanical vibration of the iron core for a long time in the daily operation of the generator, the slot wedge and the filler strip are slightly shrunk, the slot wedge is loose, the bar in the slot is vibrated, the corona-preventing layer of the bar is firstly abraded and damaged, and the main insulation is seriously damaged. It is a very important task to check the tightness of the slot wedge in the maintenance of the generator.

The gap between the stator and the rotor of the generator is limited, and the slot wedge tightness cannot be detected under the condition that the rotor of the generator is not pulled out. Therefore, the conventional domestic detection method is to utilize the machine set maintenance opportunity, take the rotor out of the generator, carry the knocking hammer into the generator by experienced personnel, and judge the tightness degree of the slot wedge by manually knocking the slot wedge to listen to the sound. Such a detection scheme cannot quantitatively analyze the tightness degree of the slot wedge, and is not accurate enough.

Disclosure of utility model

The utility model aims at providing a detection tool, uses this detection tool, is favorable to accurate elasticity of detecting the interior slot wedge of motor stator thorax.

In order to achieve the above-mentioned purpose, the present disclosure provides a detection tool for detecting tightness of a slot wedge in a stator bore of a motor, including a force application component and a detection component, wherein a force application end of the force application component is suitable for acting on a surface of the slot wedge to be detected, so that the slot wedge generates a position change in a slot of the stator of the motor, and the detection component is used for detecting a displacement of the slot wedge in the slot.

Optionally, the force application assembly comprises a force application part and a power source, wherein the power source is connected with the force application part and provides pressure application power for the force application part, and the force application end is arranged on the force application part.

Optionally, the width of the force application end is smaller than the width of the wire slot of the slot wedge mounting position.

Optionally, the pressing piece is configured as a hydraulic jack, and the power source is configured as a hydraulic cylinder.

Optionally, the detection assembly includes a dial indicator and a mounting bracket for mounting the dial indicator, the mounting bracket is detachably mounted in the bore of the motor stator, and a detection end of the dial indicator is adapted to contact the surface of the slot wedge to measure the displacement of the slot wedge in the slot.

Optionally, the number of the dial indicators is multiple, and two dial indicators in the multiple dial indicators are respectively arranged on two opposite sides of the contact point position on the slot wedge, which is used for being matched with the force application end.

Optionally, the mounting bracket includes base and installation pole, the installation pole is fixed in the base, the percentage table install in the installation pole, base detachably install in the motor stator's thorax.

Optionally, the base includes a magnet portion, and the base is attracted to the iron core inside the stator through the magnet portion.

Optionally, the detection tool further comprises a support rod, the support rod is a telescopic rod with a locking function, one end of the support rod is suitable for the force application component to be connected, and the other end of the support rod is detachably propped in the bore of the motor stator.

Optionally, one end of the supporting rod far away from the force application component is provided with a base, and the width of the base is larger than that of the wire slot.

Through the technical scheme, the detection tool is designed and used for detecting the tightness of the slot wedge in the motor stator bore, and comprises a force application component and a detection component, wherein the force application end of the force application component is suitable for acting on the surface of the slot wedge to be detected, so that the slot wedge generates position change in the slot groove of the motor stator, the detection component is used for detecting the concrete numerical value of the position change of the slot wedge, namely displacement, and the loosening degree of the slot wedge is obtained by comparing the displacement, so that the loosening degree of a stator bar is favorable for being accurately calculated.

Through the technical scheme, when the tightness of the slot wedge is required to be detected, the force application end of the force application component can act on the surface of the slot wedge required to be detected, so that the slot wedge generates position change in the slot, the detection component is used for detecting the displacement of the position change of the slot wedge, the detected displacement is compared with the preset displacement, the tightness of the slot wedge is accurately detected, and the looseness of the stator bar is accurately obtained.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

FIG. 1 is a perspective view of a work scenario in which a detection tool provided by an exemplary embodiment of the present disclosure is mounted within a motor stator bore;

FIG. 2 is an enlarged schematic view of the portion A of FIG. 1;

FIG. 3 is a schematic side view of a work scenario in which a detection tool provided by an exemplary embodiment of the present disclosure is mounted within a motor stator bore;

FIG. 4 is an enlarged schematic view of the portion B of FIG. 3;

FIG. 5 is an enlarged schematic view of another view of the force application assembly of the detection tool mounted to the motor stator bore position (force application direction shown with arrows) provided by an exemplary embodiment of the present disclosure;

Fig. 6 is a schematic elevational view of a force application assembly provided in an exemplary embodiment of the present disclosure.

Description of the reference numerals

1. The device comprises a force application component, 11, a pressing piece, 111, a force application end, 12, a power source, 2, a detection component, 21, a dial indicator, 22, a mounting rack, 221, a base, 222, a mounting rod, 3, a support rod, 31, a base, 4, a motor stator, 5, a slot wedge, 6, a stator bar, 7, a wire slot, 8 and a corrugated plate.

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

In the description of the present disclosure, it should be understood that the terms "upper," "lower," and the like indicate an orientation or a positional relationship defined based on the drawing direction shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, and a specific orientation configuration and operation, and thus should not be construed as limiting the present disclosure, and that the terms "inner and outer" refer to the inside and outside of the corresponding structural outline.

In the description of the present disclosure, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "mounted" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art as the case may be.

As shown in fig. 1 to 6, the present disclosure provides a detection tool for detecting tightness of a slot wedge 5 in a bore of a motor stator 4, which includes a force application component 1 and a detection component 2, wherein a force application end 111 of the force application component 1 acts on a surface of the slot wedge 5 to be detected, so that the slot wedge 5 generates a position change in a wire slot 7 of a motor electronic 4, and the detection component 2 is used for detecting a displacement of the slot wedge 5 in the wire slot 7.

Through the above technical scheme, when the tightness of the slot wedge 5 needs to be detected, the force application end 111 of the force application component 1 can be acted on the surface of the slot wedge 5 needing to be detected, so that the slot wedge 5 generates position change in the online slot 7, the detection component 2 is used for detecting the concrete numerical value of the position change of the slot wedge 5, namely displacement, the detected displacement is compared with the preset displacement, so that the tightness of the slot wedge is accurately detected, the looseness of the stator bar 6 is accurately obtained, and the reliability of the installation of the stator bar 6 is improved by adopting corresponding measures.

It will be appreciated that the predetermined displacement amount may be obtained in advance by an experiment, specifically, at the time of the experiment, a predetermined force may be applied to the slot wedge 5, and the displacement amount in the slot 7 of the slot wedge 5 at the standard position (i.e., the position within the allowable range of the error range) under the predetermined force is detected.

The force application assembly 1 comprises a pressing member 11 and a power source 12, wherein the power source 12 is connected with the pressing member 11 and provides power for pressing the pressing member 11, and a force application end 111 is arranged on the pressing member 11. During detection, the force application end 111 is tightly pressed on the slot wedge 5, if the pressure is directly applied manually, the pressure is inaccurate during the pressure application, so that the problem of inaccurate detected result is caused, and therefore, the power source 12 is connected to the pressure application part 11, and the power source 12 can give stable force, thereby being beneficial to ensuring the accuracy of the measurement result.

The pressing member 11 and the power source 12 may be detachably connected, and because the pressing member 11 and the power source 12 are detachably connected, the power source 12 and the pressing member 11 may be respectively taken into the stator bore during use, or the power source 12 may be placed outside, as shown in fig. 1, and the pressing member 11 in the stator bore may be provided with power by the power source 12 through connecting wires or connecting pipes, which not only ensures that the pressing member 11 is conveniently provided with power from time to time, but also is convenient to install, and does not affect the internal space. After the pressure applying part 11 is installed in the stator bore, the external power source 12 is connected to ensure sufficient power.

As shown in fig. 2, 4 and 5, the width of the force application end 111 on the pressing member 11 is smaller than the width of the slot 7, so that the force application end 111 can be pressed to the slot wedge 5 to be measured when pressing conveniently, and the influence on the measurement result due to the fact that the force application point is pressed to the iron core beside due to the angle problem or the installation position problem is prevented.

It will be appreciated that the force application end 111 may be a plane of the end of the force application member 11, the width direction of the plane is the same as the width direction of the slot 7, the width direction of the slot 7 is the circumferential direction in the stator bore, and the length direction of the slot 7 is the axial direction in the stator bore, so the length direction of the force application end 111 may be greater than the width direction of the slot 7, and the length direction of the force application end 111 is not limited.

For convenience of use of the pressing member 11, the operation is simple, the pressing member 11 may be provided as a hydraulic jack, and the power source 12 may be provided as a hydraulic cylinder. The force application assembly 1 is specifically limited to be two, the operation is simple, and the force application of the hydraulic jack is accurate and stable, so that the accuracy of a measurement result can be ensured.

It will be appreciated that the force application assembly 1 is not necessarily limited to hydraulic jacks and cylinders, and that other components having a pressing function may be used.

It will be appreciated that the present disclosure is not limited to the particular configuration of the detection assembly 2, so long as it is capable of accurately detecting the particular amount of change in position of the wedge 5.

As shown in fig. 2, 4 and 5, in one embodiment of the present disclosure, to ensure the accuracy of the inspection tool, the inspection assembly 2 includes a dial gauge 21 and a mounting frame 22 for mounting the dial gauge 21, the mounting frame 22 is detachably mounted in the bore of the motor stator 4, and the inspection end of the dial gauge 21 contacts the surface of the slot wedge 5 to measure the displacement amount of the slot wedge 5. The dial gauge 21 is accurate in measurement and does not need to be provided with a circuit, so that the dial gauge is convenient to install and detach. The distance detecting instrument, such as a laser sensor, an infrared sensor, etc., requires a wiring for installation at the time of use, and thus is troublesome for installation and also requires disassembly after use, which is complicated for installation and inconvenient for disassembly compared with the dial indicator 21 described above.

For more accurate detection results, the number of the dial indicators 21 is plural, and two dial indicators 21 of the dial indicators 21 are respectively disposed on two opposite sides of the slot wedge 5 for contacting the force application end 111. The pressure points are measured on both sides, so that the measured displacement difference caused by the pressure value difference on both sides is prevented from greatly influencing the measurement result.

The above-mentioned opposite side positions may refer to both side ends in the width direction of the force application end 111, and as shown in fig. 2, the position of the slot wedge 5 pressed by the force application end 111 will have the most accurate displacement, so the detected position should be at this position.

In fact, the more accurate the value of the position detection is, the more the dial gauge 21 can be provided, preventing accidental problems of the single position detection from affecting the detection result. As shown in fig. 5, the large arrow indicates the direction of the force application, and the arrows on both sides indicate the detection points of the dial indicator 21, and the arrows on both sides indicating the detection points may be located as close to the force application end 111 as possible in order to secure the detection result.

To facilitate the installation of the dial gauge 21, the mounting frame 22 may include a base 221 and a mounting bar 222, the mounting bar 222 being fixed to the base 221, the dial gauge 21 being mounted to the mounting bar 222, the base 221 being detachably mounted in the bore of the motor stator 4. The installation stability can be guaranteed to the mounting bracket 22 that uses the area base 221, guarantees that percentage table 21 can not shake when measuring, sets up mounting bracket 22 because the buckled plate 8 deflection below slot wedge 5 is the micron order, and handheld measurement very easily appears the error, consequently sets up base 221 installation percentage table 21 and can guarantee measuring precision.

The base 221 may include a magnet portion, and the base 221 may be attracted to a core inside the stator. The base 221 is provided with a magnet portion, and when the magnet portion is detected, the base 221 can be attached to the iron core in the motor stator bore, and when the magnet portion is removed, the magnet portion can be separated.

It should be explained that the magnet part may be made of a magnet for the whole base 221, or may be disposed at the bottom of the base 221, so long as the stability of the base 221 is not affected.

For installation stability, the force application component 1 can be installed in the bore of the motor stator 4 through one component during installation, as shown in fig. 6, the detection tool can further comprise a support rod 3, the support rod 3 is a telescopic rod with a locking function, one end of the support rod 3 is suitable for the force application component 1 to be connected, and the other end of the support rod 3 is detachably abutted in the bore of the motor stator 4. The telescopic rod is connected to the force application assembly 1, and can be abutted against the bore of the motor stator 4 at two ends, so that the force application assembly 1 can be abutted against the slot wedge 5 to be detected. And the telescopic rod is convenient to adapt to motor stators with diameters of various sizes, and one end of a pressing piece 11 connected with the telescopic rod can be abutted against the surface of the slot wedge 5 to be detected.

It will be appreciated that the specific type of telescopic rod is not limited and may be a pull rod member, or a threaded rod, as long as the length of the rod member of the support rod 3 can be adjusted and locked to a certain desired length. For example, the supporting rod 3 adopts a threaded telescopic rod, and can be freely telescopic and adjustable according to the inner diameter requirement of the bore of the generator stator 4, so that when the tightness of the slot wedge 5 is measured, the two ends of the supporting rod are convenient to support and bear force, and the supporting rod is used for lifting the force application assembly 1.

When the stator bore is measured, the force points of the supporting rod 3 can be fixed on the circumference of the iron core, and in order to better fix the supporting rod 3 on the iron core, a base 31 can be additionally arranged at one end of the supporting rod 3 for fixing the stressed position. One end of the support rod 3 far away from the force application component 1 is provided with a base 31, and the width of the base 31 is larger than that of the wire slot 7. The base 31 is arranged, the width of the base 31 is larger than that of the wire groove 7, and one end, away from the detection position, of the supporting rod 3 can be prevented from being pressed onto the slot wedge 5 to be detected, so that the measuring precision of the slot wedge is prevented from being influenced.

In the present disclosure, stator bars 6 are mounted in wire slots 7 and are keyed using slot wedges 5. Alternatively, in one embodiment of the present disclosure, as shown in fig. 2 to 4, a corrugation plate 8 may be provided between the slot wedge 5 and the stator bar 6, and when a force is applied to the slot wedge 5 by the force application assembly 1, the displacement amount of the slot wedge 5 within the wire groove 7 may be detected by the deformation of the corrugation plate 8.

Alternatively, in another embodiment of the present disclosure, other structures that can be deformed under a certain pressure may be provided between the slot wedge 5 and the stator bar 6, or the side of the slot wedge 5 itself facing the stator bar 6 may be provided as a structure that can be deformed under a certain pressure.

The force application component 1 and the detection component 2 may be separate components, and both components are respectively installed during detection, for example, during detection, the force application component 1 is pressed at the position of the slot wedge 5 to be detected, then the calculated pressing force is applied to the position to be detected, the displacement of the slot wedge 5 at the position where the pressing force is applied is detected by using the detection component 2, and compared with the preset displacement, the loosening degree of the slot wedge 5 can be obtained through calculation, so that the loosening degree of the stator bar 6 is obtained.

The present disclosure does not limit the specific value of the pressing force. Specifically, the pressing force may be designed according to the following relationship: pp= (10 x PF)/Fk x Nb x NL bar, where Pp is the hydraulic pump applied pressure, PF is the detected pressure, fk is the hydraulic cylinder effective piston area (cm ²) on the hydraulic pump, nb is the slot width of the slot 7, and NL is the slot length of the slot 7. For example, the cylinder piston radius of an existing hydraulic pump is 1 inch (1 pound force per square inch (psi) =0.06895 [ bar ]). If the slot width of the slot 7 of the motor stator 4 used is 55.6mm, the slot length of the slot 7 is 220mm, and the number and thickness of the corrugated plates 8 under the slot wedge 5 are 1 x 0.9mm. The detection pressure PF of the single slot wedge 5 is 1.8Mpa (18 kg/cm 2), and the detection pressure PF is also known according to a pressure conversion formula: when the unit pressure was set to 18kgf/cm2 by converting the area of the cylinder to 10 g. From this equation of the above pressing force, it can be calculated that:

Pp= (10 x pf)/Fk x Nb x nl=18 x 55.6 x 220 x 0.06895[ bar ] bar-1518 (psi). Where psi is the unit of english pressure, i.e., the pressure generated by a load of 1 pound per square inch of area, the pressure applied by the hydraulic pump to the individual wedge 5 is ultimately calculated to be 1518 (psi), and this value is rounded to account for errors, so in this example the hydraulic pump is set to 1600 (psi) for the wedge 5 tightness dedicated measurement tool. Namely, the pressing force is 1600 (psi).

Essentially, the application adopts the structure modularization, the base 31 and the supporting rod 3 are connected with the force application piece, and then the dial indicators 21 are arranged at the two ends of the slot wedge 5, so that the maintenance site can be quickly disassembled and assembled, and the application is similar to a quick connection device, thereby effectively reducing the operation time in the stator bore, reducing the disassembling and assembling damage rate of equipment, reducing the working intensity and improving the detection efficiency and the detection economy; when the hydraulic pump is in a non-working state, the hydraulic pump is in a pressure release state, and the support rod 3 is in a contracted state, so that the later maintenance of the tool is facilitated; the special tool can be used for quantitatively detecting the tightness of the slot wedge 5, the detection result is real and objective, the data record can be reserved, and the history record can be inquired and traced.

In addition, the inspector can lay a rubber sheet before working for protection so as to prevent the stator core from being damaged during inspection, and the inspection pressing position is a slot wedge, so that the stator bar 6 is not damaged; the special tool for measuring can be disassembled in a plurality of parts, can be carried to the site at any time for measurement after being temporarily assembled, and has more accurate data measured by using the high-precision dial indicator 21.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the embodiments described above, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims (8)

1. The detection tool is used for detecting the tightness of the slot wedge in the stator bore of the motor and is characterized by comprising a force application component and a detection component;

the force application end of the force application component is suitable for acting on the surface of the slot wedge to be detected, so that the slot wedge generates position change in the slot of the motor stator;

the detection component is used for detecting the displacement of the slot wedge in the slot;

The force application assembly comprises a force application part and a power source, wherein the power source is connected with the force application part and provides pressure application power for the force application part, and the force application part is provided with the force application end;

the pressure applying piece is arranged as a hydraulic jack, and the power source is arranged as a hydraulic cylinder.

2. The inspection tool of claim 1 wherein the width of the force application end is less than the width of the wire slot of the wedge mounting location.

3. The inspection tool of claim 1 wherein said inspection assembly comprises a dial indicator and a mounting bracket for mounting a dial indicator, said mounting bracket being removably mounted within a bore of said motor stator;

the detection end of the dial indicator is suitable for contacting the surface of the slot wedge so as to measure the displacement of the slot wedge in the slot.

4. The inspection tool of claim 3 wherein the number of said dial indicators is a plurality and two of said dial indicators are disposed on opposite sides of said wedge for mating with said force application end.

5. The inspection tool of claim 4 wherein said mounting bracket includes a base and a mounting bar, said mounting bar being secured to the base;

The dial indicator is mounted on the mounting rod, and the base is detachably mounted in the bore of the motor stator.

6. The inspection tool of claim 5 wherein said base includes a magnet portion by which said base is attracted to an iron core inside the stator.

7. The tool according to any one of claims 1 to 6, further comprising a support rod, wherein the support rod is a telescopic rod with a locking function, one end of the support rod is suitable for being connected with the force application assembly, and the other end of the support rod is detachably abutted in the bore of the motor stator.

8. The inspection tool of claim 7 wherein an end of the support rod remote from the force application assembly is provided with a base having a width greater than the width of the wire chase.