Block type guide bearing bush holding device of vertical water-turbine generator set
By designing a tiling device including a base, a top and a bidirectional screw shaft, the problem of existing tools being easily slipped and fall off during the guide bearing adjustment process is solved, and more precise tiling clearance adjustment is achieved, which improves the stability and safety of unit operation.
Patent Information
- Application Number
- CN202421974302.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-14
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-08-14
AI Technical Summary
During the adjustment of the guide bearings of vertical water turbine generator sets, existing tools are prone to slip sideways and fall off, resulting in false clearance of guide shingles, affecting the unit's operating stability and safety.
A tiling device including a base, a top and a bidirectional screw shaft is designed. Through the hook and inner arc design, the base and the top cannot rotate with the axis, and the speed of their distance from each other is controlled to achieve more accurate tiling clearance adjustment.
The device ensures the authenticity and accuracy of the guide tile clearance, reduces the possibility of rework, and improves the stability and safety of unit operation.
Smart Images
Figure CN222879806U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vertical water turbine generator sets, in particular to a bushing holding device for a block-type guide bearing bush of a vertical water turbine generator set. Background Art
[0002] The function of the guide bearing of a vertical hydro-turbine generator is to keep the hydro-turbine generator running at a certain center position and bear radial force. The size of the bearing clearance directly affects the running stability of the unit and the temperature of the bearing. The size of the bearing clearance will also affect the swing and vibration of the unit, which is crucial to the safe operation of the unit. If the guide bearing is loose, the clearance is too large, and the lubrication is poor, dry friction between the bearing pad surface and the shaft contact surface will occur, causing excessive vibration of the shaft; if the guide bearing clearance is too small, the vibration of the shaft will be transmitted to the support and foundation, and the wear of the guide bearing will also be accelerated. During the installation and commissioning of the unit, handling and installing the guide bearing pad is an important link to ensure the stable operation of the unit.
[0003] The upper and lower guide bearings of the vertical mixed flow turbine generator set are both pillar screw block guide bearings. Each unit has 8 guide bearings on the upper and lower guide bearings. The method for adjusting the clearance of the pillar screw block guide bearings is: hold the two bearings tightly against the main shaft collar in the symmetrical direction at the same time (note that there should be no obvious displacement of the main shaft when using a dial indicator to monitor). When holding the bearings, two small jacks can be used to push the guide bearings against the collar on both sides of the center line of the bearing back. Figure 1 As shown, it should remain in the original position after being topped up, and then adjust the length of the support screw, and measure the gap with a feeler gauge so that the gap between the spherical surface of the head and the bearing back support block is equal to the calculated adjustment value of the bearing. After adjustment, clamp the nut of the support screw with a wrench, and tighten the nut with another wrench. After tightening, remeasure the gap. If there is no error, proceed to adjust the gap of the next group (two symmetrical pieces). After all adjustments are completed, it is necessary to comprehensively review the gap, which is allowed to be within ±0.005mm. After meeting the requirements, remove the small jack, clamp the clamping plate and lock the nut to prevent loosening during operation.
[0004] At present, special tools are required in the process of holding the bearing. During the maintenance of the unit, maintenance workers usually use M20 screws to make simple bearing tools. Since the bearing back is convex arc-shaped and the bearing race is concave arc-shaped, the simple tools made are easy to slide and fall off when subjected to force, causing uneven force on both sides of the guide bearing, and then false points appear in the adjusted guide bearing clearance value, resulting in rework. At the same time, the guide bearing surface is Babbitt alloy, which has a weak texture. During the process of holding the bearing, a certain elastic variable will be generated, which has an adverse effect on the authenticity of the clearance after the guide bearing is adjusted. Utility Model Content
[0005] The main purpose of the utility model is to provide a bushing holding device for a block-type guide bearing bush of a vertical turbine generator set, aiming to solve the above-mentioned technical problems.
[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0007] A shoe holding device for a block-type guide bearing shoe of a vertical hydro-turbine generator set, characterized by comprising:
[0008] The base comprises a first threaded sleeve with openings at both ends, one end of the first threaded sleeve is vertically connected to one end surface of a bottom plate, one side of the bottom plate is connected to one end of a straight plate, and the other end of the straight plate is provided with a hook claw;
[0009] A top seat including a second threaded sleeve with an open end;
[0010] The rotating shaft is a bidirectional screw, one end of the rotating shaft is threadedly inserted into the first threaded sleeve, and the other end of the rotating shaft is threadedly inserted into the second threaded sleeve, and the thread spiral directions of the first threaded sleeve and the second threaded sleeve are opposite.
[0011] As a further improvement of the present invention, the hook is formed by bending one end of the straight plate away from the base plate 90° in a direction away from the first threaded sleeve, and the thickness of the straight plate along the axial direction of the first threaded sleeve is smaller than the thickness of the base plate.
[0012] As a further improvement of the utility model, an inner arc surface is provided on the end surface of the bottom plate away from the first threaded sleeve, the axial direction of the inner arc surface is parallel to the radial direction of the straight plate, and the axis of the inner arc surface intersects and is perpendicular to the axis of the first threaded sleeve.
[0013] As a further improvement of the utility model, the base also includes a magnetic block, the inner arc surface is provided with a countersunk hole coaxial with the first threaded sleeve, and the magnetic block is arranged in the countersunk hole.
[0014] As a further improvement of the utility model, it also includes a lever, a through hole is set in the middle of the rotating shaft, the middle section of the lever passes through and stays in the through hole, rivet heads are set at both ends of the lever, and the axis of the through hole intersects and is perpendicular to the axis of the rotating shaft.
[0015] Beneficial effects of the utility model:
[0016] In the utility model, the straight plate cooperates with the hook claw to prevent the base from rotating with the rotating shaft. When the top seat abuts against the bearing seat ring at one end away from the rotating shaft and the friction resistance between the top seat and the bearing seat ring is greater than the follow-up friction force of the spiral pair, the top seat cannot rotate with the rotating shaft. Driving the rotating shaft to rotate can make the base and the top seat move away from each other to complete the process of the guide bearing tightly pressing against the main shaft collar; at the same time, the threaded design of the first sleeve, the second sleeve and the rotating shaft, and the rotating shaft need to be manually turned by the lever, so that the speed at which the base and the top seat move away from each other is slow, so that the value fluctuation during the adjustment process is not large, and the adjusted value is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the operation of adjusting the clearance of the pillar screw block guide bearing;
[0018] Figure 2 It is a three-dimensional structural schematic diagram of the bearing bushing holding device of the block-type guide bearing bushing of the vertical turbine generator set;
[0019] Figure 3 It is a front sectional view of a bearing bushing holding device of a block-type guide bearing bushing of a vertical turbine generator set;
[0020] Description of reference numerals:
[0021] 10. Spindle collar; 20. Guide bushing; 30. Small jack; 40. Bearing race; 50. Pillar screw; 60. Measuring unit;
[0022] 1. Base; 11. First threaded sleeve; 12. Bottom plate; 121. Inner arc surface; 122. Countersunk hole; 13. Straight plate; 131. Hook; 14. Magnetic block; 2. Top seat; 21. Second threaded sleeve; 3. Rotating shaft; 31. Through hole; 4. Push rod; 41. Rivet head. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0024] Figure 2 and Figure 3 An embodiment of the utility model of a vertical turbine generator block guide bearing shoe holding device is shown, see Figure 2 and Figure 3In this embodiment, the bearing shoe device of the block guide bearing shoe of the vertical turbine generator group includes: a base 1, a top seat 2, a rotating shaft 3 and a lever 4;
[0025] Among them, see Figure 2 and Figure 3 The base 1 includes a first threaded sleeve 11 with openings at both ends, one end of the first threaded sleeve is vertically connected to one end surface of a bottom plate 12, one side of the bottom plate 12 is connected to one end of a straight plate 13, and the other end of the straight plate 13 is provided with a hook 131; the top seat 2 includes a second threaded sleeve 21 with an opening at one end; the rotating shaft 3 is a bidirectional screw, one end of the rotating shaft 3 is threadedly inserted into the first threaded sleeve 11, and the other end of the rotating shaft 3 is threadedly inserted into the second threaded sleeve 21, and the screw directions of the first threaded sleeve 11 and the second threaded sleeve 21 are opposite; a through hole 31 is provided in the middle of the rotating shaft 3, and the middle section of the shifting rod 4 passes through and is retained in the through hole 31. When the device provided in this embodiment is used in the process of adjusting the guide bearing clearance and holding the bearing, the end face of the bottom plate 12 away from the first sleeve abuts against the back side of the guide bearing, and the hook 131 overlaps one axial end of the guide bearing to limit the bottom plate 12 and prevent the first threaded sleeve 11 from rotating around its own axis; the sealing end of the second threaded sleeve 21 abuts against the inner wall of the bearing seat ring, and when the friction resistance between the end of the second threaded sleeve 21 away from the rotating shaft 3 and the inner wall of the bearing seat ring is greater than the follow-up friction force of the spiral pair, the second threaded sleeve 21 will not rotate around its own axis with the rotating shaft 3, thereby preventing the base 1 and the top seat 2 from rotating together with the rotating shaft 3. External force drives the lever 4 to make the rotating shaft 3 rotate in one direction around its own axis, so that the base 1 and the top seat 2 can move away from each other; because the rotating shaft 3 is a bidirectional screw, threads are arranged in the first threaded sleeve 11 and the second threaded sleeve 21. During use, the lever 4 needs to be driven and rotated circle by circle, so that the base 1 and the top seat 2 move away from each other at a slower speed; when two guide bearings symmetrical along the axis of the pillar screw are used in multiple devices at the same time, the two symmetrical guide bearings can both hold the main shaft collar tightly to complete the clearance adjustment of the pillar screw block guide bearing.
[0026] Further, see Figure 2 and Figure 3 The hook 131 is formed by bending the end of the straight plate 13 away from the bottom plate 12 by 90 degrees in the direction away from the first threaded sleeve 11. When the base 1 is set on the back of the guide bearing, the hook 131 overlaps one end of the axial direction of the guide bearing. Since the length of the straight plate 13 is a fixed value, the position of the base 1 to the two ends of the axial direction of the guide bearing can be fixed.
[0027] Preferably, the axial distance from the inner side of the hook 131 to the first threaded sleeve 11 is equal to half the axial length of the guide bearing, so that when the base 1 abuts against the back of the guide bearing, the distance from the first threaded sleeve 11 to the axial ends of the guide bearing is consistent.
[0028] Preferably, the thickness of the straight plate 13 along the axial direction of the first threaded sleeve 11 is smaller than the thickness of the bottom plate 12, so that the end surface of the bottom plate 12 away from the first threaded sleeve 11 is not affected by the straight plate 13 when it abuts against the back of the guide bearing. Figure 2 and Figure 3 The end face of the bottom plate 12 away from the first threaded sleeve 11 is provided with an inner arc surface 121 with a radius equal to the radius of the back side of the guide bearing bush. The axis of the inner arc surface 121 is parallel to the length radial line of the straight plate 13, so that the inner arc surface 121 of the bottom plate 12 is in close contact with the back side of the guide bearing bush. The axis of the inner arc surface 121 intersects and is perpendicular to the axis of the first threaded sleeve 11, so that when one end of the rotating shaft 3 is threadedly inserted into the first threaded sleeve 11, the axis of the guide shaft is perpendicular to the back side of the guide bearing bush. When the rotating shafts 3 of multiple devices are perpendicular to the inner wall of the bearing race, the axis of the guide bearing bush is perpendicular to the bearing race and the axis of the main shaft, thereby ensuring that the hydro-turbine generator set can operate normally after the bearing clearance is adjusted.
[0029] Further, see Figure 2 and Figure 3 The base 1 also includes a magnetic block 14, and the inner arc surface 121 is provided with a countersunk hole 122 coaxial with the first threaded sleeve 11. The magnetic block 14 is arranged in the countersunk hole 122, and the magnetic block 14 can make the inner arc surface 121 of the bottom plate 12 close to the back of the guide bearing.
[0030] Preferably, the magnetic block 14 is a strong NdFeB magnet. Before installing the magnetic block 14 , a non-magnetic copper sheet needs to be provided in the counterbore 122 to prevent the end of the shaft 3 away from the second threaded sleeve 21 from being attached to the magnetic block 14 .
[0031] Preferably, rivet heads 41 are provided at both ends of the lever 4. The rivet head 41 is pressed at one end of the lever 4, and the rivet head 41 is also pressed after the other end of the lever 4 passes through the through hole 31, so as to limit the lever 4 on the rotating shaft 3 to prevent the lever 4 from being separated from the rotating shaft 3 during use. At the same time, both ends of the lever 4 can be used as force application points. After one end of the lever 4 applies force to do work, the other end of the lever 4 can be pulled out to apply force again, so as to avoid the inconvenience of rotating the lever 4 due to narrow space.
[0032] Preferably, the axis of the through hole 31 intersects and is perpendicular to the axis of the shaft 3, so that when the lever 4 is driven to rotate, the stress from the lever 4 on the shaft 3 is concentrated on the axis of the shaft 3, thereby preventing the shaft 3 from bending or being damaged due to uneven stress.
[0033] For example, in the process of adjusting the guide bearing clearance and locking the bearing, the method of using the locking device of the block guide bearing bearing of the vertical turbine generator group is as follows:
[0034] S1. Install the guide bearings. Arrange the eight guide bearings in a circular shape on the outside of the main shaft. Each guide bearing is close to the main shaft.
[0035] S2. Installation of the holding device of the block-type guide bearing bush of the vertical hydro-turbine generator group. Two guide bearing bushes arranged opposite to each other form a group. One such device is arranged on both sides of the symmetrical centerline of each guide bearing bush in the same group. The inner arc surface 121 of the bottom plate 12 of the device is tightly attached to the back of the guide bearing bush. The hook 131 is snapped on one radial end of the guide bearing bush to fasten the base 1 of the device to the back of the guide bearing bush. One hand gently holds the second threaded sleeve 21, and the other hand moves the lever 4 to drive the rotating shaft 3 to rotate, so that the device is extended until the end of the second threaded sleeve 21 away from the rotating shaft 3 abuts against the inner wall of the bearing seat ring and is slightly stressed. Repeat the above operation for each of the remaining devices.
[0036] S3. Tighten the guide bearing and simultaneously move the two levers 4 of the device provided on the same guide bearing. The rotation angles of the two levers 4 should be as consistent as possible until the guide bearing is pressed tightly against the spindle collar. The other guide bearing in the same group performs the aforementioned operation synchronously.
[0037] It should be noted that when monitoring the spindle with a dial indicator throughout the entire process of holding the bearing, there should be no obvious displacement. After symmetrically tightening the guide bearing, the spindle should be 100% in the zero position before the operation. After jacking, shake the device, it should not shake or fall off, and should remain in its original position.
[0038] In this embodiment, the straight plate 13 cooperates with the hook claw 131 to prevent the base 1 from rotating with the rotating shaft 3. When the end of the top seat 2 away from the rotating shaft 3 abuts against the bearing race, and the friction resistance between the top seat 2 and the bearing race is greater than the follow-up friction force of the spiral pair, the top seat 2 cannot rotate with the rotating shaft 3. Driving the rotating shaft 3 to rotate can make the base 1 and the top seat 2 move away from each other to complete the process of the guide bearing tightly pressing against the main shaft collar; at the same time, the threaded design of the first sleeve, the second sleeve and the rotating shaft 3, and the rotating shaft 3 requires manual toggling of the lever 4 to rotate, so that the speed at which the base 1 and the top seat 2 move away from each other is slow, so that the value fluctuation during the adjustment process is not large, and the adjusted value is more accurate.
[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A bearing shoe holding device for a block guide bearing shoe of a vertical turbine generator set, characterized in that: include: The base comprises a first threaded sleeve with openings at both ends, one end of the first threaded sleeve is vertically connected to one end surface of a bottom plate, one side of the bottom plate is connected to one end of a straight plate, and the other end of the straight plate is provided with a hook claw; A top seat including a second threaded sleeve with an open end; The rotating shaft is a bidirectional screw, one end of the rotating shaft is threadedly inserted into the first threaded sleeve, and the other end of the rotating shaft is threadedly inserted into the second threaded sleeve, and the thread spiral directions of the first threaded sleeve and the second threaded sleeve are opposite.
2. The shoe holding device of the block guide bearing shoe of the vertical turbine generator set according to claim 1 is characterized in that: The hook is formed by bending one end of the straight plate away from the bottom plate by 90° in a direction away from the first threaded sleeve, and the thickness of the straight plate along the axial direction of the first threaded sleeve is smaller than the thickness of the bottom plate.
3. The shoe holding device of the block guide bearing shoe of the vertical turbine generator set according to claim 1 is characterized in that: An inner arc surface is arranged on the end surface of the bottom plate away from the first threaded sleeve, the axial direction of the inner arc surface is parallel to the radial direction of the straight plate, and the axis of the inner arc surface intersects and is perpendicular to the axis of the first threaded sleeve.
4. The shoe holding device of the block guide bearing shoe of the vertical turbine generator set according to claim 3 is characterized in that: The base also includes a magnetic block, the inner arc surface is provided with a countersunk hole coaxial with the first threaded sleeve, and the magnetic block is arranged in the countersunk hole.
5. The shoe holding device of the block guide bearing shoe of the vertical turbine generator set according to claim 1 is characterized in that: It also includes a lever, a through hole is arranged in the middle of the rotating shaft, the middle section of the lever passes through and is retained in the through hole, rivet heads are arranged at both ends of the lever, and the axis of the through hole intersects and is perpendicular to the axis of the rotating shaft.