Hydro-generator air gap measuring device and method

Abstract

The application discloses a kind of water turbine generator air gap measuring device and method, it is related to water turbine generator detection technical field.The water turbine generator air gap measuring device of the present application includes frame, measuring piece, slide bar, connecting piece and top support spring, the frame extends along the first direction and has the first measurement surface, the frame is equipped with scale line, the measuring piece is positioned adjustable along the second direction perpendicular to the first direction and is equipped with second measurement surface in the frame, the slide bar is positioned adjustable along the first direction in the frame, the slide bar is equipped with pointer corresponding the scale line, the connecting piece is moved in the frame and two ends are respectively connected with the measuring piece and the slide bar, the top support spring is between the measuring piece and the frame.The water turbine generator air gap measuring device of the present application is simple and practical, easy to operate, high accuracy, can realize the quick measurement to water turbine generator air gap.

Description

Technical Field

[0001] This invention relates to the field of hydro-generator testing technology, specifically to a device and method for measuring the air gap of a hydro-generator. Background Technology

[0002] The air gap in a hydro-generator refers to the gap between the rotor magnetic poles and the stator core. It is a crucial operating parameter. Uneven air gaps can lead to unbalanced magnetic pull on one side of the generator, causing accelerated wear on the more stressed side of the bearing, increased bearing temperature, and even bearing failure. It also increases vibration and noise, and in severe cases, can cause stator-rotor collisions, seriously affecting the stable operation of the hydro-generator unit.

[0003] In related technologies, generator air gap measuring tools generally utilize wedge-shaped blocks. First, the block assembly is placed into the stator-rotor gap, and a position mark is made on the operating lever handle (reading 1). The block is then pressed down by pushing the operating lever, and another mark is made (reading 2). The block is then removed and returned to its original marked position. Finally, the thickness of the block is measured with vernier calipers; this is the air gap value at the measurement point. This method has low accuracy, is cumbersome, time-consuming, and labor-intensive. Furthermore, it requires carrying numerous tools, increasing the risk of small parts falling between the stator and rotor, posing a safety hazard. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, this invention provides a hydro-generator air gap measuring device, which is simple, practical, easy to operate, and highly accurate, enabling rapid measurement of the air gap of a hydro-generator.

[0006] This invention also proposes a method for measuring the air gap of a hydro-generator.

[0007] The air gap measuring device for a hydro-generator according to an embodiment of the present invention includes: A frame, the frame extending along a first direction and having a first measuring surface, the frame having scale lines extending along the first direction; The device includes a measuring element, a sliding rod, and a connecting element. The measuring element is adjustablely positioned on the frame along a second direction perpendicular to the first direction. The end of the measuring element away from the frame has a second measuring surface corresponding to the first measuring surface. The sliding rod is adjustablely positioned on the frame along the first direction and has a pointer corresponding to the scale line. The connecting element is movably positioned on the frame and its two ends are respectively connected to the measuring element and the sliding rod so that when one of the measuring element and the sliding rod moves relative to the frame, the other moves. A top support spring is provided between the measuring element and the frame, and the top support spring is used to drive the measuring element to move away from the frame when there is no external force on the measuring element and the slide rod. The measuring element has an initial position and a measuring position. In the initial position, there is a set distance between the second measuring surface and the first measuring surface, and the pointer indicates a first scale value on the scale line. In the measuring position, the second measuring surface has a first displacement relative to the first measuring surface, and the slide bar has a second displacement relative to the frame with the same value as the first displacement. The pointer indicates a second scale value on the scale line.

[0008] The air gap measuring device for hydro-generators in this invention is simple, practical, easy to operate, and highly accurate, enabling rapid measurement of the air gap of hydro-generators.

[0009] In some embodiments, the frame is provided with a sliding groove extending in a first direction, an adjusting groove extending in a second direction, and a measuring groove extending in a second direction. The sliding groove and the adjusting groove are connected. The measuring groove passes through the side of the frame and is connected to the sliding groove. The sliding rod is slidably disposed in the sliding groove. The measuring element is slidably disposed in the adjusting groove. The connecting element is slidably disposed in the sliding groove and the adjusting groove. The top support spring is disposed in the adjusting groove and its two ends abut against the bottom of the measuring element and the adjusting groove, respectively. The sliding rod is provided with a measuring part extending in the second direction and slidably disposed in the measuring groove. The pointer is disposed in the measuring part.

[0010] In some embodiments, a connecting cylinder is included, the connecting cylinder being slidably disposed in the adjusting groove, the measuring element being slidably disposed within the connecting cylinder, the end of the connecting cylinder near the measuring element engaging with the end of the measuring element near the frame, the end of the connecting cylinder away from the measuring element engaging with the end of the adjusting groove near the measuring element, and the end of the measuring element away from the frame engaging with the end of the connecting cylinder away from the frame.

[0011] In some embodiments, the frame is provided with a handle extending in a second direction, the handle being disposed corresponding to the measuring part and located at the end of the measuring groove away from the measuring element, and the length of the handle being greater than the length of the measuring part extending out of the measuring groove.

[0012] In some embodiments, a damping element is included, which is disposed on the frame and connected to the slide rod. The damping element is used to increase the resistance when the slide rod slides relative to the frame so as to fix the slide rod to the frame without external force.

[0013] In some embodiments, a guide wheel is included, the guide wheel is disposed on the frame and the guide wheel is provided with an annular guide groove along the circumferential direction, the connector is placed in the guide groove, and the guide wheel is used to guide the movement direction of the connector.

[0014] In some embodiments, a levelness measuring element is included, which is disposed at one end of the frame away from the measuring element, and is used to display the levelness of the frame when the measuring device measures the air gap of the hydro-generator.

[0015] In some embodiments, the second measuring surface at the end of the measuring element is a spherical surface, the frame includes a detachably connected movable head, the movable head being disposed corresponding to the measuring element, and the end of the movable head away from the measuring element being a first measuring surface, the first measuring surface being a spherical surface.

[0016] In some embodiments, a digital vernier caliper is included, the digital vernier caliper including a scale body and a depth gauge, the scale body extending along a first direction and connected to the frame, the depth gauge being connected to the slide bar, and the digital vernier caliper being used to display the displacement value of the slide bar.

[0017] The method for measuring the air gap of a hydro-generator according to embodiments of the present invention includes the hydro-generator air gap measuring device of any of the above embodiments, and the measuring method includes the following steps: S1: Apply external force to the slide bar to move the slide bar and make the slide bar move the measuring piece to the initial position, and check whether the pointer indicates the first scale value; S2: Place the first and second measuring surfaces of the measuring device at the air gap measuring point between the rotor magnetic pole and the stator core, and make the first measuring surface tightly against the stator core; S3: Remove the external force applied to the slide bar, the top support spring pushes the measuring element to move and drives the slide bar to move through the connecting piece until the second measuring surface presses against the rotor magnetic pole, and the slide bar moves to the pointer indicating the second scale value; S4: The air gap value between the rotor magnetic pole and the stator core at the corresponding measurement position can be calculated by the difference between the second scale value and the first scale value and the set distance between the second measuring surface and the first measuring surface at the initial position. S5: Repeat steps S1 to S5 to measure the gap at different positions of the same magnetic pole. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the mechanism of the air gap measuring device for a hydro-generator according to an embodiment of the present invention, viewed from a first perspective.

[0019] Figure 2 yes Figure 1 A sectional view.

[0020] Figure 3 This is a schematic diagram of the mechanism of the hydro-generator air gap measuring device according to an embodiment of the present invention from a second perspective.

[0021] Figure 4 yes Figure 3 A sectional view.

[0022] Figure label: Frame 1; Scale lines 11; Slide groove 12; Adjustment groove 13; Measuring groove 14; Handle 15; Movable head 16; Measuring component 2; Measuring column 21; Measuring head 22; Receiving groove 23; Slide bar 3; pointer 31; measuring part 32; Connector 4; Support spring 5; Connecting cylinder 6; Guide wheel 7; Levelness measuring piece 8; Digital vernier caliper 9; scale body 91; depth gauge 92. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the air gap measuring device for a hydro-generator according to an embodiment of the present invention includes a frame 1, a measuring element 2, a slide rod 3, a connecting member 4, and a top support spring 5. The frame 1 extends along a first direction and has a first measuring surface. The frame 1 is provided with a scale line 11 extending along the first direction. The measuring element 2 is adjustablely positioned on the frame 1 along a second direction perpendicular to the first direction. The end of the measuring element 2 away from the frame 1 is provided with a second measuring surface corresponding to the first measuring surface. The slide rod 3 is adjustablely positioned on the frame 1 along the first direction. The slide rod 3 is provided with a pointer 31 corresponding to the scale line 11. The connecting member 4 is movably positioned on the frame 1 and its two ends are respectively connected to the measuring element 2 and the slide rod 3 to measure the air gap of the hydro-generator. When one of the measuring element 2 and the slide bar 3 moves relative to the frame 1, it drives the other to move. The top support spring 5 is located between the measuring element 2 and the frame 1. The top support spring 5 is used to drive the measuring element 2 to move away from the frame 1 when there is no external force on the measuring element 2 and the slide bar 3. The measuring element 2 has an initial position and a measuring position. In the initial position, there is a set distance between the second measuring surface and the first measuring surface. The pointer 31 indicates the first scale value on the scale line 11. In the measuring position, the second measuring surface has a first displacement relative to the first measuring surface. The slide bar 3 has a second displacement relative to the frame 1 with the same value as the first displacement. The pointer 31 indicates the second scale value on the scale line 11.

[0025] In use, the air gap measuring device for a hydro-generator according to this embodiment of the invention applies an external force to the slide bar 3 to move it. During the movement, the slide bar 3 drives the measuring element 2 to move until the measuring element 2 reaches the initial position. At this time, the pointer 31 indicates the first scale value. The first and second measuring surfaces of the measuring device are placed at the air gap measuring position between the rotor magnetic pole and the stator core, and the first measuring surface is made to be in close contact with the stator core. The external force applied to the slide bar 3 is removed, and the support spring 5 pushes the measuring element 2 to move and drives the slide bar 3 to move through the connecting piece 4 until the second measuring surface presses against the rotor magnetic pole. The slide bar 3 moves until the pointer 31 indicates the second scale value. The difference between the second scale value and the first scale value is used to obtain the value of the first displacement of the second measuring surface from the initial position to the measuring position. The air gap value between the rotor magnetic pole and the stator core at the corresponding measuring position can be calculated by the set distance between the second measuring surface and the first measuring surface at the initial position.

[0026] The air gap measuring device for hydro-generators in this embodiment of the invention is simple and practical. The measuring element 2 is moved by the support spring 5 without the action of external force, which is convenient to operate. The displacement of the measuring element 2 is converted into the displacement of the slide rod 3 through the connecting part 4, which is convenient for observation and measurement. It has high accuracy and realizes rapid measurement of the air gap of hydro-generators.

[0027] Optionally, the frame 1 is provided with a scale extending along the first direction, and multiple scales spaced apart on the scale form scale lines 11 on the frame 1.

[0028] In some embodiments, such as Figure 2 and Figure 4 As shown, connector 4 is made of steel wire, which ensures the connection strength of connector 4 while preventing the steel wire from deforming under stress during use.

[0029] In some embodiments, the value of the first scale value is equal to the value of the set distance between the first measuring surface and the second measuring surface of the measuring element 2 at the initial position. When in the measuring position, the obtained second scale value is the air gap value of the hydro-generator at the measured position, which facilitates rapid measurement.

[0030] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the frame 1 is provided with a sliding groove 12 extending in a first direction, an adjustment groove 13 extending in a second direction, and a measuring groove 14 extending in a second direction. The sliding groove 12 and the adjustment groove 13 are connected. The measuring groove 14 passes through the side of the frame 1 and is connected to the sliding groove 12. The sliding rod 3 is slidably disposed in the sliding groove 12. The measuring element 2 is slidably disposed in the adjustment groove 13. The connecting element 4 is slidably disposed in the sliding groove 12 and the adjustment groove 13. The top support spring 5 is disposed in the adjustment groove 13 and its two ends abut against the bottom of the groove of the measuring element 2 and the adjustment groove 13, respectively. The sliding rod 3 is provided with a measuring part 32 extending in the second direction and slidably disposed in the measuring groove 14. The pointer 31 is disposed in the measuring part 32.

[0031] When the slide rod 3 is moved to the initial position along the slide groove 12, the slide rod 3 drives the measuring element 2 to move through the connecting piece 4 and compresses the top support spring 5, so that the top support spring 5 accumulates elastic force. During measurement, the top support spring 5 pushes the measuring element 2 to move and moves through the connecting piece 4 and the slide rod 3. The adjusting groove 13 restricts the displacement of the measuring element 2 to prevent the spring from bending and thus causing elastic failure, ensuring the stability of the measuring element 2 during movement. At the same time, the connecting piece 4 and part of the slide rod 3 are moved inside the frame 1 through the slide groove 12 to protect the connecting piece 4 and the slide rod 3, ensuring that the connecting rod and the slide rod 3 are not interfered with by the external environment during measurement, and ensuring the accuracy of the measurement.

[0032] Optionally, at least one side of the measuring side is provided with a scale line 11, and the measuring part 32 is provided with pointers 31 on both sides corresponding to the scale line 11, so as to facilitate reading the position of the pointers 31 on the scale line 11.

[0033] Optionally, the slide groove 12 on the frame 1 is provided with a limiting groove corresponding to the measuring groove 14, and the slide rod 3 is provided with a limiting part corresponding to the measuring part. The limiting part is slidably disposed in the limiting groove, thereby increasing the stability of the slide rod 3 when it moves.

[0034] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, it includes a connecting cylinder 6, which is slidably disposed in the adjusting groove 13. The measuring element 2 is slidably disposed inside the connecting cylinder 6. The end of the connecting cylinder 6 near the measuring element 2 is in a stop-fitting engagement with the end of the measuring element 2 near the frame 1. The end of the connecting cylinder 6 away from the measuring element 2 is in a stop-fitting engagement with the end of the adjusting groove 13 near the measuring element 2. The end of the measuring element 2 away from the frame 1 is in a stop-fitting engagement with the end of the connecting cylinder 6 away from the frame 1.

[0035] During measurement, the top support spring 5 pushes the measuring component 2 to move away from the frame 1. When the end of the measuring component 2 closest to the frame 1 is blocked by the connecting cylinder 6, the top support spring continues to push the measuring component 2 to move and drives the connecting cylinder 6 to move relative to the frame 1. When resetting the measuring component 2, the slide rod 3 moves and pulls the measuring component 2 towards the frame 1 through the connecting component 4. When the end of the measuring component 2 furthest from the frame 1 is blocked by the connecting cylinder 6, the measuring component 2 drives the connecting cylinder 6 to move towards the frame 1. By setting the connecting cylinder 6, the measuring position of the measuring component 2 can be increased while ensuring that the size of the frame 1 in the second direction remains unchanged, thus improving the applicable position of the measuring device.

[0036] Optionally, the measuring component 2 includes a measuring column 21 and a measuring head 22. The end of the measuring head 22 away from the measuring column 21 is a second measuring surface. The measuring head 22 and the connecting cylinder 6 are in a stop-fitting arrangement along the axial direction of the measuring column 21. The measuring column 21 is slidably disposed within the connecting cylinder 6. A first limiting ring is provided at the end of the measuring head 22 away from the measuring component 2. The first limiting ring is slidably disposed within the connecting cylinder 6 and is in a stop-fitting arrangement with the connecting cylinder 6. A second limiting ring is provided at the end of the connecting cylinder 6 away from the measuring component 2. The second limiting ring is slidably disposed within the adjusting groove 13 and is in a stop-fitting arrangement with the end of the adjusting groove 13 away from the frame 1.

[0037] Optionally, the measuring column 21 is provided with a receiving groove 23. One end of the top support spring 5 extends into the receiving groove 23 and presses against the bottom of the receiving groove 23. When the measuring component 2 is in the initial position, the top support spring 5 can be completely received in the receiving groove 23, reducing the size of the measuring device in the second direction in the initial position, thereby increasing the measuring range of the measuring device and ensuring the measurement accuracy.

[0038] Optionally, the two ends of the top support spring 5 are fixedly connected to the bottom of the measuring element 2 and the adjusting groove 13, respectively.

[0039] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the frame 1 is provided with a handle 15 extending in the second direction. The handle 15 is provided corresponding to the measuring part 32 and is located at the end of the measuring groove 14 away from the measuring member 2. The length of the handle 15 is greater than the length of the measuring part 32 extending out of the measuring groove 14.

[0040] The handle 15 is provided for easy gripping of the measuring device during use. The measuring personnel can adjust the position of the measuring part 32 with their index and middle fingers to put the measuring part 2 in the initial position. During measurement, the personnel can loosen the fixing of the measuring part 32 with their index and middle fingers to contact external force, making it convenient for personnel to apply pushing force to the measuring part 32 and to adjust the measuring part 32. This makes it more labor-saving to use and facilitates the rapid measurement of the air gap of the hydro-generator.

[0041] Optionally, the length of the measuring section 32 extending out of the measuring groove 14 is no greater than half the length of the handle 15.

[0042] In some embodiments, a damping element is included. The damping element is disposed on the frame 1 and connected to the slide rod 3. The damping element is used to increase the resistance when the slide rod 3 slides relative to the frame 1 so as to fix the slide rod 3 to the frame 1 without external force. The damping element prevents the slide rod 3 from moving relative to the frame 1 when the frame 1 is in a vertical state and there is no external force on the slide rod 3, so as to ensure the accuracy of the position of the pointer 31 during measurement, and thus ensure the accuracy of the measurement of the air gap of the hydro-generator by the measuring device during use.

[0043] Optionally, the damping component is a damping sleeve, which is fixedly mounted on the frame 1 and sleeved on the slide rod 3. The damping sleeve is used to increase the resistance encountered by the slide rod 3 when it moves, so that when the frame 1 is in a vertical state, the slide rod 3 cannot slide relative to the frame 1 under its own weight.

[0044] Optionally, the damping component is a damping block, which is fixedly mounted on the frame 1 and located on one side of the slide rod 3. The damping block is used to increase the resistance encountered by the slide rod 3 when it moves, so that when the frame 1 is in a vertical state, the slide rod 3 cannot slide relative to the frame 1 under its own weight.

[0045] In some embodiments, such as Figure 2 and Figure 4 As shown, it includes a guide wheel 7, which is disposed on the frame 1 and has an annular guide groove along the circumferential direction. The connector 4 is placed in the guide groove. The guide wheel 7 is used to guide the movement direction of the connector 4, realize the change of direction when the connector 4 moves through the guide wheel 7, reduce the friction of the connector 4 when the movement direction changes, and constrain the connector 4 through the guide groove to prevent the connector 4 from slipping off the guide wheel 7, thus ensuring the reliability of the connection between the connector 4 and the guide wheel 7.

[0046] Optionally, the guide wheel 7 is located at the intersection of the extension line of the slide groove 12 and the extension line of the adjustment groove 13.

[0047] Optionally, the guide wheel 7 is rotatably mounted on the frame 1. When guiding the connector 4, the rotation of the guide wheel 7 reduces the friction between the connector 4 and the guide wheel 7, thereby reducing the wear of the connector 4 and increasing its service life.

[0048] In some embodiments, such as Figure 1 and Figure 3 As shown, it includes a levelness measuring component 82, which is located at the end of the frame 1 away from the measuring component 2. The levelness measuring component 82 is used to display the levelness of the frame 1 when the measuring device measures the air gap of the hydro-generator. The levelness of the frame 1 is calibrated by the levelness measuring component 82 during the measurement to ensure the accuracy of the measurement distance between the first measuring surface and the second measuring surface during the measurement.

[0049] Optionally, the levelness measuring element 82 is a bubble level, which is low in cost and easy to use.

[0050] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the second measuring surface at the end of the measuring element 2 is a spherical surface. The frame 1 includes a detachably connected movable head 16, which is set corresponding to the measuring element 2. The end of the movable head 16 away from the measuring element 2 is the first measuring surface, which is a spherical surface.

[0051] By setting the first and second measuring surfaces as spherical surfaces, it is convenient to contact the ends of the rotor magnetic poles and stator core respectively during measurement, so as to ensure the accuracy of the measurement. At the same time, the use of spherical surfaces can avoid damage to the rotor magnetic poles, stator core or other internal components of the generator by the measuring device during measurement, which is safe and reliable. The movable head 16 is detached from the connecting frame 1, and movable heads 16 with spherical surfaces of different diameters can be used to adapt to the measurement of different air gaps.

[0052] Optionally, the end face of the movable head 16 near the frame 1 is provided with a threaded part, which is threadedly connected to the frame 1.

[0053] Optionally, the movable head 16 is provided with a plug-in part, and the movable head 16 is slidably inserted into the frame 1 along a third direction perpendicular to the first direction and perpendicular to the second direction through the plug-in part.

[0054] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, it includes a digital vernier caliper 9, which includes a scale body 91 and a depth gauge 92. The scale body 91 extends along a first direction and is connected to the frame 1. The depth gauge 92 is connected to the slide bar 3. The digital vernier caliper 9 is used to display the displacement value of the slide bar 3.

[0055] A digital vernier caliper 9 is set up, and the movement of the slide bar 3 drives the movement of the depth gauge 92, thereby realizing the dual measurement of the displacement of the measuring part 2. The accuracy of the measured data can be guaranteed by comparing the dual measurement results.

[0056] It should be noted that the digital vernier caliper 9 is existing technology, and its specific working principle and structure will not be described in detail here.

[0057] The digital vernier caliper 9 is equipped with a "zero" button. After obtaining an accurate value at the measurement position, pressing the "zero" button allows for comparison of the gap change values ​​between the relative positions of the same magnetic poles.

[0058] The air gap measuring device for hydro-generators according to embodiments of the present invention has the following beneficial effects: 1. This device transmits motion through the top support spring 5, enabling the reciprocating motion of the measuring piece 2. This allows the tightness of the device to be controlled at any time during the measurement gap, avoiding situations where the measurement is too tight or too loose and cannot be adjusted. The operation is convenient, fast, flexible, and labor-saving.

[0059] 2. The measuring device uses a digital vernier caliper for dual measurement, which makes reading convenient and direct, improves measurement efficiency, and ensures measurement accuracy and the reliability of the measured values.

[0060] 3. It overcomes the previous problem that the ruler could not penetrate to a certain depth between the magnetic pole and the stator core when measuring air gap, making the measurement value more accurate and reliable.

[0061] 4. The range of applications of the measuring device is increased by the connecting cylinder 6 and the detachable movable head 16.

[0062] The following describes a method for measuring the air gap of a hydro-generator according to an embodiment of the present invention.

[0063] The method for measuring the air gap of a hydro-generator according to embodiments of the present invention includes the hydro-generator air gap measuring device of any of the above embodiments, and the measuring method includes the following steps: S1: Apply an external force to slide bar 3 to move slide bar 3, and make slide bar 3 drive measuring element 2 to move to the initial position, and check whether pointer 31 indicates the first scale value; S2: Place the first and second measuring surfaces of the measuring device at the air gap measuring point between the rotor magnetic pole and the stator core, and make the first measuring surface tightly against the stator core; S3: Remove the external force applied to the slide bar 3. The top support spring 5 pushes the measuring element 2 to move and drives the slide bar 3 to move through the connecting piece 4 until the second measuring surface presses against the rotor magnetic pole. The slide bar 3 moves to the pointer 31 indicating the second scale value. S4: The air gap value between the rotor magnetic pole and the stator core at the corresponding measurement position can be calculated by the difference between the second scale value and the first scale value and the set distance between the second measuring surface and the first measuring surface at the initial position. S5: Repeat steps S1 to S5 to measure the gap at different positions of the same magnetic pole.

[0064] The method for measuring the air gap of a hydro-generator according to this invention is easy to operate. The measuring element 2 is moved by the support spring 5 without the action of external force, which saves more effort. Furthermore, the displacement of the measuring element 2 is converted into the displacement of the slide rod 3 through the connecting part 4, which facilitates observation and measurement, and has high accuracy, thus realizing the rapid measurement of the air gap of the hydro-generator.

[0065] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0067] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for measuring the air gap of a hydro-generator, characterized in that, include: A frame, the frame extending along a first direction and having a first measuring surface, the frame having scale lines extending along the first direction; The device includes a measuring element, a sliding rod, and a connecting element. The measuring element is adjustablely positioned on the frame along a second direction perpendicular to the first direction. The end of the measuring element away from the frame has a second measuring surface corresponding to the first measuring surface. The sliding rod is adjustablely positioned on the frame along the first direction and has a pointer corresponding to the scale line. The connecting element is movably positioned on the frame and its two ends are respectively connected to the measuring element and the sliding rod so that when one of the measuring element and the sliding rod moves relative to the frame, the other moves. A top support spring is provided between the measuring element and the frame, and the top support spring is used to drive the measuring element to move away from the frame when there is no external force on the measuring element and the slide rod. The measuring element has an initial position and a measuring position. In the initial position, there is a set distance between the second measuring surface and the first measuring surface, and the pointer indicates a first scale value on the scale line. In the measuring position, the second measuring surface has a first displacement relative to the first measuring surface, and the slide bar has a second displacement relative to the frame that is the same as the first displacement value. The pointer indicates a second scale value on the scale line. The frame is provided with a sliding groove extending in a first direction, an adjusting groove extending in a second direction, and a measuring groove extending in a second direction. The sliding groove and the adjusting groove are connected. The measuring groove passes through the side of the frame and is connected to the sliding groove. The sliding rod is slidably disposed in the sliding groove. The measuring element is slidably disposed in the adjusting groove. The connecting element is slidably disposed in the sliding groove and the adjusting groove. The top support spring is disposed in the adjusting groove and its two ends abut against the bottom of the measuring element and the adjusting groove, respectively. The sliding rod is provided with a measuring part extending in the second direction and slidably disposed in the measuring groove. The pointer is disposed in the measuring part. The guide wheel is disposed on the frame and has an annular guide groove along the circumference. The connector is placed in the guide groove and the guide wheel is used to guide the movement direction of the connector. A levelness measuring device is provided at one end of the frame away from the measuring device, and the levelness measuring device is used to display the levelness of the frame when the measuring device measures the air gap of the hydro-generator.

2. The air gap measuring device for a hydro-generator according to claim 1, characterized in that, The device includes a connecting cylinder, which is slidably disposed in the adjusting groove. The measuring element is slidably disposed inside the connecting cylinder. The end of the connecting cylinder near the measuring element is in a stop-fitting engagement with the end of the measuring element near the frame. The end of the connecting cylinder away from the measuring element is in a stop-fitting engagement with the end of the adjusting groove near the measuring element. The end of the measuring element away from the frame is in a stop-fitting engagement with the end of the connecting cylinder away from the frame.

3. The air gap measuring device for a hydro-generator according to claim 1, characterized in that, The frame is provided with a handle extending in a second direction. The handle is provided corresponding to the measuring part and is located at the end of the measuring groove away from the measuring element. The length of the handle is greater than the length of the measuring part extending out of the measuring groove.

4. The air gap measuring device for a hydro-generator according to claim 1, characterized in that, The device includes a damping element, which is disposed on the frame and connected to the slide rod. The damping element is used to increase the resistance when the slide rod slides relative to the frame so as to fix the slide rod to the frame without external force.

5. The air gap measuring device for a hydro-generator according to claim 1, characterized in that, The second measuring surface at the end of the measuring component is a spherical surface. The frame includes a detachably connected movable head, which is configured corresponding to the measuring component. The end of the movable head away from the measuring component is the first measuring surface, which is a spherical surface.

6. The air gap measuring device for a hydro-generator according to claim 1, characterized in that, The device includes a digital vernier caliper, which comprises a scale body and a depth gauge. The scale body extends along a first direction and is connected to the frame. The depth gauge is connected to the slide bar. The digital vernier caliper is used to display the displacement value of the slide bar.

7. A method for measuring the air gap of a hydro-generator, characterized in that... Includes the air gap measuring device for a hydro-generator as described in any one of claims 1-6, and the measuring method Includes the following steps: S1: Apply external force to the slide bar to move the slide bar and make the slide bar move the measuring piece to the initial position, and check whether the pointer indicates the first scale value; S2: Place the first and second measuring surfaces of the measuring device at the air gap measuring point between the rotor magnetic pole and the stator core, and make the first measuring surface tightly against the stator core; S3: Remove the external force applied to the slide bar, the top support spring pushes the measuring element to move and drives the slide bar to move through the connecting piece until the second measuring surface presses against the rotor magnetic pole, and the slide bar moves to the pointer indicating the second scale value; S4: The air gap value between the rotor magnetic pole and the stator core at the corresponding measurement position can be calculated by the difference between the second scale value and the first scale value and the set distance between the second measuring surface and the first measuring surface at the initial position. S5: Repeat steps S1 to S5 to measure the gap at different positions of the same magnetic pole.

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