Generator guide bearing structure with external pillar nut

Abstract

The generator guide bearing structure comprises a guide bearing bush, base plates lined on the upper side and the lower side of the guide bearing bush, a pillar screw, a sleeve, the pillar nut and an oil cover, wherein one end of the pillar screw abuts against the guide bearing bush, and the other end of the pillar screw extends out of an oil groove wall; the sleeve is arranged in the oil groove wall; the bearing bush gap adjusting device has the advantages that the bearing bush gap is adjusted through the matching of the pillar nut and the pillar screw, and adjustment can be completed in a small operation space and is not limited by factors of the size of an oil groove; the guide bearing is simple in structure, convenient to use and free of assistance of other large equipment during installation, manpower and material resources are effectively saved, and the installation efficiency is improved; compared with a traditional wedge-shaped block for adjusting the gap between the bearing bushes, the combination of the pillar nut and the pillar screw is easier to replace and maintain in subsequent use, and the service life of the bearing is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of water wheel power generation equipment, in particular to a generator guide bearing structure with an external support nut. Background Art

[0002] The guide bearing is an important component in the hydro-turbine generator. Its main functions are: supporting the shaft of the turbine to keep it stable during operation; reducing the friction between the shaft and the guide bearing through lubricants to improve the efficiency of the turbine; maintaining the correct position and direction of the shaft to maximize the capture of water energy; reducing wear and extending the service life of the turbine. In general, the guide bearing is an indispensable key component in the hydro-turbine generator set. It plays an important role in supporting, positioning, controlling vibration and reducing friction losses during the operation of the unit, and has a great impact on the safety and economy of the unit. Therefore, in the design, manufacturing, operation and maintenance of the hydro-turbine generator set, great attention should be paid to the quality and performance of the guide bearing to ensure its normal operation.

[0003] In the prior art, the oil tank of the lower frame of the hydro-turbine generator is generally small, and the guide bearing installation and guide shoe clearance adjustment can only be performed in a narrow space, which brings great inconvenience to the installation and adjustment of the guide bearing. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a generator guide bearing structure with an external pillar nut, so that the clearance between the guide bearing and the main shaft can be adjusted by adjusting the cooperation between the pillar nut and the pillar screw, which is not limited by the narrow operating space in the lower frame, reduces the difficulty of installation, and has the characteristics of simple structure and low processing difficulty.

[0005] The technical scheme adopted by the utility model is as follows: a generator guide bearing structure with an external support nut, including a guide bearing shell installed outside the generator main shaft, the guide bearing and the adjacent thrust bearing adopt a combined oil groove arrangement, and an oil groove wall is provided on the side of the oil groove close to the guide bearing; one end of the support screw is pressed against the outer side of the guide bearing shell, and the other end extends out of the oil groove wall through a threaded hole; the support nut is installed at the position where the support screw extends out of the oil groove wall, and cooperates with the support screw; a pad is arranged on the upper and lower sides of the guide bearing shell.

[0006] Preferably, an inner boss is provided on the oil groove wall at a position corresponding to the guide bearing bush, and its axial height is consistent with the axial height of the guide bearing bush; and the threaded hole on the oil groove wall is arranged at the center of the inner boss.

[0007] Preferably, a sleeve is built into the inner boss, one side of the sleeve is flush with the surface of the inner boss, and the other side abuts against the threaded hole on the wall of the oil groove.

[0008] Preferably, the inner diameter of the sleeve is consistent with the threaded hole on the oil tank wall; the inner side of the sleeve is provided with threads consistent with the threaded hole on the oil tank wall; the support screw will pass through the sleeve and the threaded hole at the same time.

[0009] Preferably, the backing plate is fixed to the upper and lower sides of the inner boss by means of screws by a fixed locking plate.

[0010] Preferably, an oil cover is provided on the outer side of the oil groove wall at the support nut.

[0011] Preferably, a rubber pad is provided at the contact point between the oil cover and the oil tank wall.

[0012] Preferably, the oil cover is fixed to the oil tank wall by screws.

[0013] Preferably, the main shaft of the generator is a hook-shaped structure.

[0014] The components in the solution adopted by the utility model, such as screws, nuts, pads, sleeves, oil covers, etc., all have regular shapes, are suitable for casting production or turning processing, and the precision control is simpler than the traditional method, which greatly reduces the processing difficulty and processing cost. Not only that, these components can be replaced individually during the subsequent maintenance process, which greatly reduces the difficulty of subsequent maintenance.

[0015] The utility model provides a guide bearing structure with an external support nut, wherein the support screw passes through the outer side of the oil groove wall through a sleeve, and the support nut is installed on the part of the support screw extending outside the oil groove wall, and the function of adjusting the gap between the guide bearing and the main shaft is realized by twisting the support screw outside the oil groove wall and adjusting the depth of the support screw entering the oil groove wall without relying on sufficient operating space for repair and adjustment.

[0016] The beneficial effects of the utility model are as follows: the bearing clearance is adjusted by the cooperation of the support nut and the support screw, which can be completed in a smaller operating space and is not limited by the size of the oil tank; the guide bearing provided by the utility model has a simple structure and is easy to use, and does not require the assistance of other large equipment during installation, which effectively saves manpower and material resources and improves installation efficiency; compared with the traditional wedge block for adjusting the bearing clearance, the combination of the support nut and the support screw is easier to replace in subsequent use, which helps to extend the service life of the bearing; the overall structure is relatively independent, and the shapes of the components are relatively regular, which reduces the difficulty of processing and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a cross-sectional view of a guide bearing structure with an external support nut provided by the utility model.

[0018] Among them, 1-generator main shaft, 2-guide bearing, 3-shim, 4-pillar screw, 5-sleeve, 6-pillar nut, 7-oil cover, 8-oil tank wall. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0020] Embodiment 1, as Figure 1 As shown, the present embodiment provides a generator guide bearing structure with an external support nut, including a guide bearing shell and an oil groove wall installed outside the generator main shaft, and also includes: a support screw, one end of which is pressed against the outside of the guide bearing shell, and the other end of which extends out of the oil groove wall through a threaded hole on the oil groove wall; a support nut, which cooperates with the support screw and is installed on the part of the support screw extending out of the oil groove wall; a pad, which is arranged on the upper and lower sides of the guide bearing shell; and an oil cover, which is arranged outside the oil groove wall and corresponds to the support nut.

[0021] An inner boss is provided on the oil groove wall at a position corresponding to the guide bush, and its axial height is consistent with the axial height of the guide bush; a threaded hole through which the support screw passes is arranged at the center of the inner boss.

[0022] A sleeve is built into the inner boss, one side of the sleeve is flush with the surface of the inner boss, and the other side is against the threaded hole on the oil tank wall. The inner diameter is consistent with the threaded hole on the inner boss. There is also a thread in the sleeve, which is consistent with the threaded hole. When connected, the support screw will pass through the sleeve and the threaded hole at the same time. The support screw contacts the oil tank wall through the sleeve. On the one hand, it can increase the force area between the support screw and the oil tank wall to ensure the stable fit between the support screw and the oil tank wall. On the other hand, it can reduce the processing accuracy requirements for the oil tank wall components. In actual production, the aperture of a small component such as a control sleeve is much simpler than the aperture of a threaded hole on a large component such as a control tank wall. At the same time, since the force is mainly dependent on the sleeve, the material requirements for the oil tank wall itself will also be reduced.

[0023] The pad is made of rubber and is fixed to the upper and lower sides of the inner boss by screws. The guide bearing is fixed in the axial position through soft contact, which can not only reduce the axial runout of the guide bearing, avoid unnecessary wear, and increase the working stability of the turbine, but also prevent the lubricating oil between the shaft and the bearing from invading the fitting part.

[0024] An oil cover is provided at the support nut. The oil cover is shaped like a bowl upside down on the support nut. A rubber pad is provided on the contact surface with the oil tank wall. It is fixed to the oil tank wall by screws to prevent the lubricating oil in the oil tank from entering the mating interior of the support screw.

[0025] Embodiment 2, as Figure 1As shown, a generator guide bearing structure with an external support nut provided in this embodiment includes a guide bearing 2, a pad 3, a support screw 4, a sleeve 5, a support nut 6, and an oil cover 7, wherein: the guide bearing 2 is installed outside the generator main shaft 1; one end of the support screw 4 presses against the guide bearing 2, and the other end extends out of the oil groove wall 8 through the sleeve 5 and the threaded hole on the oil groove wall 8; the pad 3 is arranged on the upper and lower sides of the guide bearing 2, and is fixed to the inner boss of the oil groove wall 8 by a fixing locking plate through screws; the support nut 6 is installed on the part of the support screw 4 extending out of the oil groove wall 8; the oil cover 7 is installed on the outside of the oil groove wall 8, and buckles the support nut 6 inside.

[0026] The generator guide bearing described in this embodiment is the lower guide bearing in the lower frame bearing group of the generator, and the bearing group also includes a thrust bearing, wherein the lower guide bearing and the thrust bearing adopt a combined oil groove design. The lower frame bearing group not only plays a role in supporting the rotor, but also reduces the friction between the main shaft and the rotor, which helps to capture water energy and improve the reliability and service life of the generator, wherein: the guide bearing includes a guide bushing 2, a gasket 3, a support screw 4, a sleeve 5, a support nut 6, and an oil cover 7; the guide bushing 2 is installed outside the main shaft of the generator, and the bottom is in contact with the lower frame, and together with the thrust bearing, it supports the rotor and plays a role in reducing the friction between the main shaft and the rotor; an inner boss is provided at a position corresponding to the guide bushing 2 on the inner side of the oil groove wall 8, and the axial height is consistent with the guide bushing 2, and a threaded hole is provided at the center of the inner boss.

[0027] One end of the support screw 4 is pressed against the outside of the guide bearing 2, and the other end extends out of the oil groove wall 8 through the threaded hole on the oil groove wall 8, thereby supporting the guide bearing 2 and the oil groove wall 8; the support nut 6 is installed on the part of the support screw 4 extending out of the oil groove wall 8, and the depth of the support screw 4 penetrating into the oil groove wall is adjusted by threaded matching, so as to adjust the gap between the guide bearing 2 and the shaft 1; the pad 3 is made of rubber, and is fixed to the upper and lower sides of the inner boss by screws on the fixed locking plate, and the axial position of the guide bearing is fixed by soft contact, which can not only reduce the axial runout of the guide bearing, avoid unnecessary wear, and increase the working stability of the turbine, but also prevent the lubricating oil between the shaft and the bearing from invading the matching parts.

[0028] The sleeve 5 is built into the inner boss of the oil groove wall 8, one side of the sleeve 5 is flush with the surface of the inner boss, and the other side is against the threaded hole of the oil groove wall 8, the inner diameter is consistent with the threaded hole on the inner boss, and the inner side of the sleeve 5 is provided with a thread consistent with the threaded hole. The support screw passes through the sleeve 5 and the threaded hole at the same time, and contacts the oil groove wall 8 through the sleeve 5. On the one hand, the force bearing area of ​​the support screw 4 and the oil groove wall 8 can be increased to ensure the stable cooperation between the support screw 4 and the oil groove wall 8, and on the other hand, the processing accuracy requirements for the oil groove wall 8 components can be reduced. In actual production, the aperture of a small component such as the control sleeve 5 is much simpler than the aperture of a threaded hole on a large component such as the control oil tank wall 8. At the same time, since the force is mainly applied by the sleeve 5, the material requirements for the oil tank wall 8 itself will also be reduced; the oil cover 7 is arranged outside the support nut 6, and the support nut 6 is turned upside down inside in a bowl shape. The oil cover 7 is fixedly connected to the oil tank wall 8 by screws, and a rubber pad is provided at the contact point to prevent the oil in the oil tank from entering the action part of the support screw 4, causing the support to loosen, thereby reducing the possibility of failure.

[0029] The components in the scheme adopted in this embodiment, such as screws, nuts, pads, sleeves, oil covers, etc., all have regular shapes, are suitable for casting production or turning processing, and the precision control is simpler than traditional methods, which greatly reduces the processing difficulty and processing cost. Not only that, these components can be replaced individually during subsequent maintenance, which greatly reduces the difficulty of subsequent maintenance.

[0030] It is obvious that the generator guide bearing is an annular structure, and the above-mentioned pad 3, support screw 4, sleeve 5, support nut 6 and oil cover 7 structure are provided at more than one position on the circumference of the guide bearing, and several support screws 4 can simultaneously support the guide bearing 2 and the oil groove wall 8. In this embodiment, there are three sets of combined structures of pads 3, support screws 4, sleeves 5, support nuts 6 and oil covers 7 on the guide bearing, and they are evenly arranged on the circumference at an interval of 120 degrees.

[0031] The operation of adjusting the gap of the generator guide bearing of this embodiment is as follows: use a wrench to tighten the support nut 6, so that the depth of the support screw 4 entering the oil groove wall 8 can be adjusted through the interaction of the threads, and the other end of the support screw 4 is pressed against the guide bearing shell 2. While the support screw 4 penetrates into the oil groove wall 8, the guide bearing shell 2 will also have its gap with the shaft 1 reduced by the action of the support screw 4. At this time, the gap between the guide bearing shell 2 and the shaft 1 and between the guide bearing shell 2 and the oil groove wall 8 can be measured to obtain whether the gap meets the design standards. By comparison, it can be determined whether the gap meets the design standards. If not, further adjustment can be made through the support nut 6.

[0032] Similarly, when the guide bearing is maintained in the future, it is also possible to easily measure and adjust the gap between the guide bearing 2 and the shaft 1, and between the guide bearing 2 and the oil groove wall 8 relatively simply through the cooperation of the support screw 4 and the support nut 6; if the support screw 4 and the support nut 6 are used for a long time, the cooperation is no longer reliable. Since the support screw 4 and the support nut 6 are standard threaded parts, they can be easily replaced after testing whether the new parts are reliable. The operation of adjusting the gap between the guide bearing 2 and the shaft 1, and between the guide bearing 2 and the oil groove wall 8 can be as shown above, without the need for the cooperation of large-scale proprietary instruments and equipment.

[0033] The beneficial effects of a generator guide bearing structure with an external strut nut provided in the present embodiment are: the bearing clearance can be adjusted by utilizing the cooperation of the strut nut and the strut screw, which can be completed in a smaller operating space and is not limited by the size of the oil tank; the guide bearing provided in the present embodiment has a simple structure and is easy to use, and does not require the assistance of other large equipment during installation, which effectively saves manpower and material resources and improves installation efficiency; compared with the traditional wedge block for adjusting the bearing clearance, the combination of the strut nut and the strut screw is easier to replace in subsequent use, which helps to extend the service life of the bearing.

[0034] Embodiment 3, compared with embodiment 2, the difference of this embodiment is that the generator guide bearing is provided with a combination structure of 4 sets of pads 3, support screws 4, sleeves 5, support nuts 6 and oil covers 7 on the guide bearing on the circumference.

[0035] like Figure 1 As shown, a generator guide bearing structure with an external support nut provided in this embodiment includes a guide bearing 2, a gasket 3, a support screw 4, a sleeve 5, a support nut 6, and an oil cover 7, wherein: the guide bearing 2 is installed outside the generator main shaft 1; one end of the support nut 4 presses against the guide bearing 2, and the other end extends out of the oil groove wall 8 through the sleeve 5 and the threaded hole on the oil groove wall 8; the gasket 3 is arranged on the upper and lower sides of the guide bearing 2, and is fixed to the inner boss of the oil groove wall 8 by a fixing locking plate through screws; the support nut 6 is installed on the part of the support screw 4 extending out of the oil groove wall 8; the oil cover 7 is installed on the outside of the oil groove wall 8, and buckles the support nut 6 inside.

[0036] The guide bearing of the generator in this embodiment is the lower guide bearing in the bearing group of the lower frame of the generator. The bearing group also includes a thrust bearing, wherein the lower guide bearing and the thrust bearing adopt a combined oil groove design. The lower frame bearing group not only supports the rotor, but also reduces the friction between the main shaft and the rotor, which helps to capture water energy and improve the reliability and service life of the generator, wherein: the guide bearing includes a guide bushing 2, a gasket 3, a support screw 4, a sleeve 5, a support nut 6, and an oil cover 7; the guide bushing 2 is installed outside the main shaft of the generator, and the bottom is in contact with the lower frame, and together with the thrust bearing, it supports the rotor and plays a role in reducing the friction between the main shaft and the rotor; an inner boss is provided on the inner side of the oil groove wall 8 at a position corresponding to the guide bushing 2, and the axial height is consistent with the guide bushing 2, and a screw is provided at the center of the inner boss The support screw 4 has one end which is pressed against the outside of the guide bearing 2, and the other end which is extended out of the oil groove wall 8 through the threaded hole on the oil groove wall 8, plays the role of supporting the guide bearing 2 and the oil groove wall 8; the support nut 6 is installed on the part of the support screw 4 which extends out of the oil groove wall 8, and the depth of the support screw 4 penetrating into the oil groove wall can be adjusted by adjusting the depth of the support screw 4 penetrating into the oil groove wall through thread matching, so as to adjust the gap between the guide bearing 2 and the shaft 1; the pad 3 is made of rubber, and the fixed locking plate is fixed to the upper and lower sides of the inner boss by screws, and the axial position of the guide bearing is fixed by soft contact, which can not only reduce the axial runout of the guide bearing and avoid unnecessary wear, The working stability of the turbine is increased, and the lubricating oil between the shaft and the bearing bush is prevented from invading the matching parts; the sleeve 5 is built into the inner boss of the oil groove wall 8, one side of the sleeve 5 is flush with the surface of the inner boss, and the other side is against the threaded hole of the oil groove wall 8, and the inner diameter is consistent with the threaded hole on the inner boss. The inner side of the sleeve 5 is provided with a thread consistent with the threaded hole, and the support screw passes through the sleeve 5 and the threaded hole at the same time, and contacts with the oil groove wall 8 through the sleeve 5. On the one hand, the force bearing area of ​​the support screw 4 and the oil groove wall 8 can be increased to ensure the stable matching between the support screw 4 and the oil groove wall 8, and on the other hand, it can reduce Regarding the processing accuracy requirements of the oil tank wall 8 components, in actual production, the aperture of a small component such as the control sleeve 5 is much simpler than the aperture of a threaded hole on a large component such as the control oil tank wall 8. At the same time, since the force is mainly applied to the sleeve 5, the material requirements for the oil tank wall 8 itself will also be reduced; the oil cover 7 is arranged outside the support nut 6, and the support nut 6 is turned upside down inside in a bowl shape. The oil cover 7 is fixedly connected to the oil tank wall 8 by screws, and a rubber pad is provided at the contact point to prevent the oil in the oil tank from entering the action part of the support screw 4, causing the support to loosen, thereby reducing the possibility of failure.

[0037] The components in the scheme adopted in this embodiment, such as screws, nuts, pads, sleeves, oil covers, etc., all have regular shapes, are suitable for casting production or turning processing, and the precision control is simpler than traditional methods, which greatly reduces the processing difficulty and processing cost. Not only that, these components can be replaced individually during subsequent maintenance, which greatly reduces the difficulty of subsequent maintenance.

[0038] It is obvious that the generator guide bearing is an annular structure, and the above-mentioned pad 3, support screw 4, sleeve 5, support nut 6 and oil cover 7 structure are provided at more than one position on the circumference of the guide bearing, and several support screws 4 can simultaneously support the guide bearing 2 and the oil groove wall 8. In this embodiment, there are four sets of combined structures of pads 3, support screws 4, sleeves 5, support nuts 6 and oil covers 7 on the guide bearing, and they are evenly arranged on the circumference at an interval of 90 degrees.

[0039] The operation of adjusting the gap of the generator guide bearing of this embodiment is as follows: use a wrench to tighten the support nut 6, so that the depth of the support screw 4 entering the oil groove wall 8 can be adjusted through the interaction of the threads, and the other end of the support screw 4 is pressed against the guide bearing shell 2. While the support screw 4 penetrates into the oil groove wall 8, the guide bearing shell 2 will also have its gap with the shaft 1 reduced by the action of the support screw 4. At this time, the gap between the guide bearing shell 2 and the shaft 1 and between the guide bearing shell 2 and the oil groove wall 8 can be measured to obtain whether the gap meets the design standards. By comparison, it can be determined whether the gap meets the design standards. If not, further adjustment can be made through the support nut 6.

[0040] Similarly, when the guide bearing is maintained in the future, it is also possible to easily measure and adjust the gap between the guide bearing 2 and the shaft 1, and between the guide bearing 2 and the oil groove wall 8 relatively simply through the cooperation of the support screw 4 and the support nut 6; if the support screw 4 and the support nut 6 are used for a long time, the cooperation is no longer reliable. Since the support screw 4 and the support nut 6 are standard threaded parts, they can be easily replaced after testing whether the new parts are reliable. The operation of adjusting the gap between the guide bearing 2 and the shaft 1, and between the guide bearing 2 and the oil groove wall 8 can be as shown above, without the need for the cooperation of large-scale proprietary instruments and equipment.

[0041] The beneficial effects of a generator guide bearing structure with an external strut nut provided in the present embodiment are: the bearing clearance can be adjusted by utilizing the cooperation of the strut nut and the strut screw, which can be completed in a smaller operating space and is not limited by the size of the oil tank; the guide bearing provided in the present embodiment has a simple structure and is easy to use, and does not require the assistance of other large equipment during installation, which effectively saves manpower and material resources and improves installation efficiency; compared with the traditional wedge block for adjusting the bearing clearance, the combination of the strut nut and the strut screw is easier to replace in subsequent use, which helps to extend the service life of the bearing.

Claims

1. A generator guide bearing structure with an external support nut, comprising a guide bearing bush (2) mounted outside a generator main shaft (1), characterized in that: The guide bearing and the adjacent thrust bearing are arranged in a combined oil groove, and an oil groove wall (8) is arranged on the side of the oil groove close to the guide bearing; one end of the support screw (4) is pressed against the outside of the guide bearing bush (2), and the other end extends out of the oil groove wall (8) through a threaded hole; the support nut (6) is installed at the part of the support screw (4) extending out of the oil groove wall (8), and cooperates with the support screw (4); the pad (3) is arranged on the upper and lower sides of the guide bearing bush (2).

2. The generator guide bearing structure with an external support nut according to claim 1, characterized in that: The oil groove wall (8) is provided with an inner boss at a position corresponding to the guide bearing bush (2), and its axial height is consistent with the axial height of the guide bearing bush (2); the threaded hole on the oil groove wall (8) is arranged at the center of the inner boss.

3. The generator guide bearing structure with an external support nut according to claim 2, characterized in that: A sleeve (5) is built into the inner boss, one side of the sleeve (5) is flush with the surface of the inner boss, and the other side abuts against the threaded hole of the oil groove wall (8).

4. The generator guide bearing structure with an external support nut according to claim 3, characterized in that: The inner diameter of the sleeve (5) is consistent with the threaded hole on the oil groove wall (8); the inner side of the sleeve (5) is provided with threads consistent with the threaded hole on the oil groove wall (8); the support screw (4) will pass through the sleeve (5) and the threaded hole at the same time.

5. The generator guide bearing structure with an external support nut according to claim 2, characterized in that: The backing plate (3) is fixed to the upper and lower sides of the inner boss by means of screws by a fixed locking plate.

6. The generator guide bearing structure with an external support nut according to claim 1, characterized in that: An oil cover (7) is arranged on the outer side of the oil groove wall (8) at the support nut (6).

7. The generator guide bearing structure with an external support nut according to claim 6, characterized in that: A rubber pad is provided at the contact point between the oil cover (7) and the oil tank wall (8).

8. The generator guide bearing structure with an external support nut according to claim 7, characterized in that: The oil cover (7) is fixed to the oil tank wall (8) by screws.

9. The generator guide bearing structure with an external support nut according to claim 1, characterized in that: The generator main shaft (1) is a hook-shaped structure.

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