CN112082515A - Device and method for measuring axial eccentricity and temperature of generator - Google Patents

Abstract

The invention discloses a device and method for measuring the axial eccentricity and temperature of a generator, comprising: a signal processor, an annular guide rail base plate, a distance measuring sensor, a temperature measuring sensor and a transfer block; the distance measuring sensor and the The temperature sensor is installed on the adapter block, and the distance measuring sensor and the temperature measurement sensor are both connected to the signal processor; wherein, the adapter block can be movably installed on the annular guide rail bottom plate; The annular guide rail base plate is provided with annular guide rails with various radii, and the annular guide rails with different radii are all in radial communication. The invention provides a device and method for measuring the axial eccentricity and temperature of a generator. The device is reliable and easy to implement. It can measure the axial eccentricity and temperature of the generator at different degrees at the same time, so as to make up for the current blank and prevent the failure of the generator. Monitoring and research offer new possibilities.

Description

A device and method for measuring generator axial eccentricity and temperature

technical field

The invention relates to the technical field of generator experimental devices, and more particularly to a device and method for measuring the axial eccentricity and temperature of a generator.

Background technique

Due to reasons such as manufacturing, assembly or operation, the air gap between the stator and rotor of the generator will cause a certain degree of non-uniformity, resulting in a large air gap on one side and a small air gap on the other side. This phenomenon is called air gap eccentricity. . The non-uniformity of the air gap will not only appear in the radial direction, but may also appear in the axial direction. For example, the rotor of the hydro-generator may have a certain axial displacement under the long-term impact of the water head, resulting in the axial air gap between the stator and rotor being small at one end and large at the other end, resulting in the static eccentricity of the air gap. At present, the results of the measurement methods for the air gap eccentricity of generators mostly focus on the radial eccentricity of the air gap, while the measurement methods for the axial eccentricity of the air gap and the three-dimensional air gap mixed eccentricity are rarely mentioned. The axial eccentricity of the gap is real, so it is not perfect to measure the radial eccentricity of the air gap alone, and the monitoring of the axial eccentricity of the generator is equally important.

In addition, with the continuous increase of the single-unit capacity of the generator in recent years, the temperature inside the generator is also getting higher and higher, and the monitoring of the temperature state inside the generator is also more and more important. The continuous increase or abnormal increase of the internal temperature of the generator will make the working condition of the generator worse, especially the damage of winding insulation wear and insulation damage. At present, there are few devices for measuring the axial eccentricity of the generator and simultaneously measuring the temperature of the generator.

Therefore, how to realize simultaneous measurement of different degrees of generator axial eccentricity and temperature is an urgent problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a device and method for measuring the axial eccentricity and temperature of a generator. The device is reliable and easy to implement, and can measure the axial eccentricity and temperature of the generator at different degrees at the same time, so as to make up for the current blanks. The fault monitoring and research of generators provide new possibilities.

In order to achieve the above object, the present invention adopts the following technical solutions:

A device for measuring the axial eccentricity and temperature of a generator, comprising: a signal processor, an annular guide rail bottom plate, a distance measuring sensor, a temperature measuring sensor and an adapter block;

The distance measuring sensor and the temperature measuring sensor are installed on the adapter block, and both the distance measuring sensor and the temperature measuring sensor are connected with the signal processor;

Wherein, the adapter block is movably installed on the annular guide rail base plate; annular guide rails with various radii are opened on the annular guide rail base plate, and the annular guide rails with different radii are all in radial communication.

Preferably, the distance measuring sensor and the temperature measuring sensor are installed at both ends of the adapter block.

Preferably, there are multiple adapter blocks.

Preferably, the adapter block is mounted on the bottom plate of the annular guide rail through a wing nut and a square head fixing bolt.

Preferably, the annular guide rail bottom plate is fixed on the generator through the annular guide rail base plate legs and fixing bolts.

Preferably, the distance measuring sensor includes: a laser distance measuring sensor, and the laser distance measuring sensor is fixed on the adapter block by two hexagon socket fixing screws.

Preferably, both the distance measuring sensor and the temperature measuring sensor are connected to the signal processor through a signal transmission wire.

Preferably, it also includes: a display module; the display module is connected to the signal processor.

A method for measuring the axial eccentricity and temperature of a generator, the method is applicable to the above-mentioned device for measuring the axial eccentricity and temperature of a generator, and the method comprises:

Different degrees of air gap axial static eccentricity measurement method:

Select a reference plane on the side end face of the generator, move the adapter block so that the distance measuring sensor is located on the first ring of the annular guide rail bottom plate, and select multiple positions to measure the reference plane;

Move the adapter block again so that the distance measuring sensor is located on the second ring of the annular guide rail base plate, and select multiple positions to measure the measurement plane; and the first ring and the second ring have different radii;

The signal processor processes the measured signal;

Methods for temperature measurement of different parts of generators:

Move the adapter block to make the temperature sensor move at the same time;

Align the temperature sensor at the generator part to be measured;

The signal processor processes the measured temperature signal.

Preferably, it also includes: outputting and displaying the result processed by the signal processor.

It can be seen from the above technical solutions that, compared with the prior art, the present invention provides a device and method for measuring the axial eccentricity and temperature of a generator. The distance measuring sensor and the temperature measuring sensor are installed on the transfer block, and the transfer The block is movably installed on the bottom plate of the ring-shaped guide rail. When measuring the axial static eccentricity of the air gap of different degrees, the moving adapter block drives the distance measuring sensor to move to the circular guide rail of different radii, and respectively in the circular guide rail of different radii. A plurality of positions are set on the guide rail to measure the reference plane and the measurement plane respectively, and are processed by the signal processor. When measuring the temperature, align the temperature sensor at the part of the generator that needs to be measured.

The technical solution provided by the invention is simple, reliable, and easy to implement, and can simultaneously measure the axial eccentricity and temperature of the generator in different degrees, making up for the current blank, and providing a new possibility for the fault monitoring and research of the generator.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative work.

1 is a schematic structural diagram of a device for measuring the axial eccentricity and temperature of a generator provided by the present invention;

2 is a schematic diagram of the principle of the laser ranging triangle reflection method provided by the present invention;

FIG. 3 is a schematic structural diagram of an annular guide rail base plate provided by the present invention;

4 is a schematic structural diagram of a switching block provided by the present invention;

FIG. 5 is a schematic structural diagram of the fixing mode of the adapter block provided by the present invention;

6 is a schematic structural diagram of a laser ranging sensor provided by the present invention;

FIG. 7 is a schematic structural diagram of the infrared temperature measurement sensor provided by the present invention.

In Figures 1-7:

1. Signal processor, 2. Signal receiving connector, 3. Ring rail bottom plate, 4. Laser ranging sensor, 5. Infrared temperature sensor, 6. Signal transmission wire, 7. Computer, 8. Reference plane, 9. Measurement Flat, 10, Adapter block, 11, wing nut, 12, square head fixing bolt, 13, fixing bolt, 14, hexagon socket head cap fixing screw, 3-1, ring rail base plate foot, 3-2, guide rail, 4- 1. Laser transmitter, 4-2, laser beam, 4-3, condenser lens, 4-4, linear CCD detector, 4-5, imaging lens, 5-1, external thread, 10-1, infrared detector The temperature sensor is placed in the threaded hole, 10-2, the bolt-wing nut fixing position, 10-3, the placement position of the laser ranging sensor.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to FIG. 1 , an embodiment of the present invention discloses a device for measuring the axial eccentricity and temperature of a generator, including: a signal processor 1 , an annular guide rail bottom plate 3 , a distance measuring sensor 4 , a temperature measuring sensor 5 and an adapter block 10 ;

The distance measuring sensor 4 and the temperature measuring sensor 5 are installed on the adapter block 10, and both the distance measuring sensor 4 and the temperature measuring sensor 5 are connected with the signal processor 1;

The adapter block 10 is movably installed on the annular guide rail base plate 3; the annular guide rail base plate 3 is provided with annular guide rails of various radii, and the annular guide rails of different radii are in radial communication.

The distance measuring sensor 4 and the temperature measuring sensor 5 are installed on the adapter block 10, and the adapter block 10 is movably installed on the annular guide rail base plate 3. When measuring the axial static eccentricity of the air gap of different degrees, the adapter block 10 is moved. The distance measuring sensor 4 is driven to move to circular guide rails with different radii, and multiple positions are respectively set on the circular guide rails with different radii to measure the reference plane and the measurement plane, and are processed by the signal processor 1 . When measuring the temperature, the temperature measuring sensor 5 is aimed at the components of the generator that need to be measured.

In order to further optimize the above technical solution, the distance measuring sensor 4 and the temperature measuring sensor 5 are installed at both ends of the adapter block 10 . There are multiple adapter blocks 10, preferably, 4 adapter blocks are used for the measurement of axial static eccentricity, and 1 or 2 adapter blocks are used for temperature measurement. The adapter block 10 is mounted on the ring-shaped guide rail base plate 3 through the wing nut 11 and the square head fixing bolt 12 . The annular guide rail base plate 3 is fixed on the generator through the annular guide rail base plate support feet 3-1 and fixing bolts 13.

In order to further optimize the above technical solution, the ranging sensor 4 includes: a laser ranging sensor, and the laser ranging sensor is fixed on the adapter block 10 by two hexagon socket fixing screws 14 . Both the distance measuring sensor 4 and the temperature measuring sensor 5 are connected to the signal processor 1 through a signal transmission wire 6 .

In order to further optimize the above technical solution, the above-mentioned device for measuring the axial eccentricity and temperature of a generator further includes: a display module; the display module is connected to the signal processor 1 . Preferably, the display module includes a computer 7 .

In addition, the embodiment of the present invention also discloses a method for measuring the axial eccentricity and temperature of a generator. The method is applicable to the above-mentioned device for measuring the axial eccentricity and temperature of a generator. The method includes:

a. Different degrees of air gap axial static eccentricity measurement method

Select a reference plane on the side end face of the generator, move the adapter block 10 so that the distance measuring sensor 4 is on the first ring of the annular guide rail base plate 3, and select multiple positions to measure the reference plane;

Move the adapter block 10 again so that the distance measuring sensor 4 is on the second ring of the annular guide rail base plate 3, and select multiple positions to measure the measurement plane; and the first ring and the second ring have different radii;

The signal processor 1 processes the measured signal;

b. Method of temperature measurement of different parts of generator

Move the adapter block 10 to make the temperature sensor 5 move at the same time;

Align the temperature sensor 5 with the generator component that needs to be measured;

The signal processor 1 processes the measured temperature signal.

In order to further optimize the above technical solution, the method further includes: outputting and displaying the result processed by the signal processor 1 .

The technical solutions of the present invention will be further described below with reference to specific embodiments.

The device for measuring the axial eccentricity and temperature of a generator provided by the present invention is mainly composed of a signal processor 1, an annular guide rail base plate 3, a laser distance measuring sensor, an infrared temperature measuring sensor, a signal transmission line 6, and a computer 7. Among them, the laser distance measuring sensor And the infrared temperature measurement sensor is fixed on the ring-shaped guide rail base plate 3 through the adapter block 10, and the ring-shaped guide rail base plate 3 is fixed on the outer casing of the generator through the ring-shaped guide rail base plate support feet 3-1 and the fixing bolts 13, wherein the ring-shaped guide rail base plate 3 is connected to the generator. The end faces of the housing are placed in parallel with a certain distance, and the adapter block 10 is fixed to the annular rail base plate 3 by square head fixing bolts 12 and wing nuts 11. At the nut fixing position 10-2, the square head fixing bolt 12 is installed in the guide rail 3-2 of the annular guide rail base plate 3; The signal collected by the sensor is input to the signal processor 1, and finally the relative offset of the rotor axial direction is output through the computer 7; wherein, the laser ranging sensor is installed at the placement position 10-3 of the laser ranging sensor.

The infrared temperature measuring sensor is fixed and matched by placing the infrared temperature measuring sensor in the threaded hole 10-1, and the infrared temperature measuring sensor is aligned with the components that the generator needs to measure. The connecting block 10, the infrared temperature sensor and the laser distance sensor are moved to any position of the ring-shaped guide base plate 3, so that the temperature of different positions of the same part can be measured at the same time, and the temperature of different parts can also be measured at the same time. The signal collected by the infrared temperature measuring sensor is transmitted to the signal processor 1 through the signal transmission wire 6 , and the temperature value is output through the computer 7 .

Wherein, each sensor is connected to the signal receiving connector 2 on the signal processor 1 through the signal transmission wire 6 to realize signal transmission.

The solution provided by the invention is reliable and easy to implement, and can simultaneously measure the axial eccentricity and temperature of the generator in different degrees, fill the current blank, and provide a new possibility for generator fault monitoring and research.

The problems to be solved by the present invention include: first, how to realize different degrees of axial static eccentricity measurement of the air gap; second, how to realize the temperature measurement of different parts of the generator; third, how to realize the simultaneous measurement of the air gap axial Simultaneous measurement of static eccentricity and generator component temperature and measurement of different component temperatures of the generator at the same time.

For the first problem, referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, the present invention adopts the following method to realize the measurement of different degrees of axial static eccentricity of the air gap:

The ring-shaped guide rail base plate 3 is placed in parallel with the end face of the generator shell with a certain distance, and is connected with the generator casing through the ring-shaped guide rail base plate support feet 3-1, and is fixed with fixing bolts 13, and the adapter block 10 is fixed by square head fixing bolts 12 and the wing nut 11 are fixed on the ring-shaped guide rail base plate 3, and the laser ranging sensor is fixed into a whole with the adapter block 10 through two inner hexagon fixing screws 14. During the entire measurement and the movement of the adapter block 10, the laser measuring The distance sensor and the adapter block 10 are always fixedly matched, and the laser ranging sensor and the adapter block 10 do not move relative to each other.

When measuring, first loosen the wing nut 11, move the adapter block 10 and the laser ranging sensor, select a reference plane on the side end face of the generator (generally choose the end face of the generator shell), and then move the adapter block 10 to ensure the laser The distance measuring sensor is located on the C ring of the ring guide base plate (see Figure 1), and four positions of +x, -x, +y, and -y are selected to measure the reference plane. Then move the adapter block 10 to ensure that the laser ranging sensor is located on the A ring of the annular guide rail base plate and select four positions A, A2, A4 and A6 (in order to make the result more accurate, the laser measuring sensor can be installed at each node of the A ring). distance sensor) to ensure the accuracy of the measurement; it should also ensure that the laser distance sensor is facing the measurement plane (generator rotor end face) after axial eccentricity, to avoid the laser distance sensor tilting to the rotor end face. The laser ranging method is called the laser triangulation method, and the measurement accuracy varies with the range. The larger the range, the lower the accuracy.

Principle of laser triangulation method: The laser transmitter 4-1 is focused to the reference plane 8 (the end face of the generator casing) by the condenser lens 4-3. The reflected light is collected by the imaging lens 4-5, and the laser beam 4-2 is projected onto the linear CCD detector 4-4; when the measured surface changes from the reference plane 8 (the end face of the generator casing) to the measurement plane 9 (the end face of the generator rotor) ), since the distance between the reference plane and the measurement plane is x, the distances from the two to the laser transmitter 4-1 are different, the position and angle of the laser beam projected by the imaging lens 4-5 on the linear CCD detector light spot are both different. When the change occurs, the signal of the position change is transmitted to the signal processor 1, processed by analog and digital circuits, and analyzed by the microprocessor, and the relative displacement distance of the rotor axial direction can be read out by the computer 7.

The calculation principle is as follows: if the displacement of the light spot on the linear CCD detector 4-4 is x', using the proportional relationship between the sides of a similar triangle, the reference plane (the end face of the generator casing) and the measurement can be obtained as follows: Distance x between planes (generator rotor end faces):

In the formula, α is the distance from the intersection of the laser beam axis and the receiving beam axis to the front main surface of the receiving lens; b is the distance from the rear main surface of the receiving lens to the center point of the linear CCD detector; θ ₁ is the laser beam optical axis and the receiving The included angle between the beam axes of the lens; θ ₂ is the included angle between the linear CCD detector and the beam axis of the receiving lens. Therefore, the specific steps of the present invention when measuring the static eccentricity of the air gap axis are:

1) Loosen the wing nut 11 used to fix the adapter block 10 and the ring rail base plate 3, slide the adapter block 10 and the laser ranging sensor to the C ring of the ring rail base plate 3, select +x, -x, The four positions of +y and -y are measured, the four laser ranging sensors are facing the end face of the generator casing, the laser ranging sensors are connected to the signal processor 1 by the signal transmission wire 6, and then the signal processor 1 is connected to the computer 7. Connected, record the position of the beam on the linear CCD detector at the moment.

2) Move the adapter block 10 to ensure that the laser ranging sensor is located on the A ring of the annular guide rail base plate 3 to select four positions A, A2, A4, and A6 for measurement.

3) Use the signal processor to read, analyze and computer output the collected signal, and finally get the result.

For the second problem, referring to FIG. 1 , FIG. 2 , FIG. 3 , FIG. 4 , FIG. 5 and FIG. 7 , the present invention adopts the following method to realize the temperature measurement of different parts of the generator: an infrared temperature measurement sensor and an adapter block 10 There is no relative movement in the fixed fit. Loosen the wing nut 11 to move the infrared temperature sensor and the adapter block 10 to the front side of the generator component under test at the same time. The infrared temperature sensor can be placed in a position where the temperature of the component can be measured. Any position in the A, B, C ring, as long as the two measurements do not interfere with each other (for the accuracy of the measurement, infrared temperature sensors should be placed in different positions of the same component). Then, align the infrared temperature sensor 5 at the generator component to be measured. The data collected by the infrared temperature measurement sensor 5 is input to the signal processor 1 for processing by using the signal transmission wire 6 , and the actual measurement result can be directly read out by the computer 7 .

Therefore, the specific steps of the present invention in setting the temperature measurement of different parts of the generator are:

1) Loosen the wing nut 11 used to fix the adapter block 10 and the annular guide rail base plate 3, and slide the adapter block 10 and the infrared temperature sensor 5 to the side of the generator component;

2) Direct the infrared temperature sensor 5 to the generator component, and connect the infrared temperature sensor 5 to the signal processor 1 using the signal transmission wire 6 .

3) Use the signal processor 1 to read, analyze and computer output the collected signal, and finally get the result.

For the third problem, referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 and Fig. 7, the present invention adopts the following method to realize the simultaneous measurement of the axial static eccentricity of the air gap and the temperature of the generator components And measure the temperature of different parts of the generator at the same time:

In order to realize the diversity of axial static eccentricity and temperature measurement positions of generator parts, an annular guide rail is designed in the present invention. The adapter block 10 together with the sensor can be made to reach any position of the ring rail base plate 3 .

When it is set to measure the axial static eccentricity and the temperature of the generator components at the same time, the annular guide bottom plate 3 should be placed at least at the A, A2, A4, and A6 positions on the most A ring to measure the rotor axial offset; The infrared temperature measuring sensor is arranged on the outer ring, and the position of the infrared temperature measuring sensor is changed according to the different positions of the generator components.

When setting to measure the temperature of different parts of the generator at the same time, first, an infrared temperature sensor should be installed at each part. In order to make the result more accurate, if conditions permit, infrared temperature measurement should be placed in different positions of the same part. sensor to measure.

The technical scheme provided by the present invention can realize the measurement of the axial eccentricity of the generator in different degrees, the temperature measurement of different components, the simultaneous measurement of the axial eccentricity of the air gap and the temperature of the generator components, and the simultaneous measurement of the different components of the generator at the same time. The temperature measurement can fill the gaps and deficiencies of the current air gap axial eccentricity fault and the temperature measurement of generator components, laying a foundation for subsequent experimental research, which is worthy of promotion.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. a device for measuring generator axial eccentricity and temperature, characterized in that, comprising: a signal processor (1), an annular guide rail bottom plate (3), a distance measuring sensor (4), a temperature measuring sensor (5) and a rotating Block (10); The distance measuring sensor (4) and the temperature measuring sensor (5) are mounted on the adapter block (10), and both the distance measuring sensor (4) and the temperature measuring sensor (5) are connected to the the signal processor (1) is connected; Wherein, the adapter block (10) is movably mounted on the annular guide rail base plate (3); the annular guide rail base plate (3) is provided with annular guide rails of various radii, and annular guide rails of different radii are provided on the annular guide rail base plate (3). are connected radially. 2 . The device for measuring the axial eccentricity and temperature of a generator according to claim 1 , wherein the distance measuring sensor ( 4 ) and the temperature measuring sensor ( 5 ) are installed on the adapter block. 3 . Both ends of (10). 3. A device for measuring the axial eccentricity and temperature of a generator according to claim 1, characterized in that there are multiple adapter blocks (10). 4. A device for measuring the axial eccentricity and temperature of a generator according to claim 1 or 3, wherein the adapter block (10) is formed by a wing nut (11) and a square head fixing bolt (12) ) is mounted on the annular guide rail bottom plate (3). 5. A device for measuring generator axial eccentricity and temperature according to claim 1, characterized in that the annular guide rail bottom plate (3) passes through the annular guide rail bottom plate support feet (3-1) and fixing bolts (13) fixed on the generator. 6. A device for measuring the axial eccentricity and temperature of a generator according to claim 1, wherein the ranging sensor (4) comprises: a laser ranging sensor, and the laser ranging sensor passes through two A set of hexagon socket screws (14) are fixed on the adapter block (10). 7. A device for measuring the axial eccentricity and temperature of a generator according to claim 1, wherein the distance measuring sensor (4) and the temperature measuring sensor (5) both pass through a signal transmission wire (6). ) is connected to the signal processor (1). 8. A device for measuring generator axial eccentricity and temperature according to claim 1, characterized in that, further comprising: a display module; The display module is connected with the signal processor (1). 9. A method for measuring the axial eccentricity and temperature of a generator, wherein the method is applicable to the device for measuring the axial eccentricity and temperature of a generator according to any one of claims 1 to 8, and the method comprises: : Different degrees of air gap axial static eccentricity measurement method: Select a reference plane on the side end face of the generator, move the adapter block (10) so that the distance measuring sensor (4) is located on the first ring of the annular guide rail base plate (3), and select multiple positions to measure the reference plane; Move the adapter block (10) again so that the distance measuring sensor (4) is on the second ring of the annular guide rail base plate (3), and select multiple positions to measure the measurement plane; and the first ring and the second ring have different radii; The signal processor (1) processes the measured signal; Methods for temperature measurement of different parts of generators: Moving the adapter block (10) makes the temperature measuring sensor (5) move at the same time; Align the temperature sensor (5) with the generator component to be measured; A signal processor (1) processes the measured temperature signal. 10 . The method for measuring the axial eccentricity and temperature of a generator according to claim 9 , further comprising: outputting and displaying the result processed by the signal processor ( 1 ). 11 .

Images