Tilting pad sliding bearing lubricating oil device of steam turbine and oil temperature adjusting method

Abstract

The invention relates to a turbine tilting pad sliding bearing lubricating oil device and an oil temperature adjusting method. The lubricating oil device comprises an oil inlet pipe and an oil supply pipe. A mounting part is arranged at the oil outlet end of the oil inlet pipe and is provided with a rotating hole; the oil supply pipe is rotationally arranged on the rotating hole, and an oil spraying hole is formed in the outer side wall of the oil supply pipe; a rotating shifting block is arranged on the outer side wall of the oil supply pipe, a mounting groove is formed in the inner side wall of the rotating hole, an arc-shaped groove coaxial with the rotating hole is formed in the mounting groove, and the sliding end of the rotating shifting block is slidably arranged on the arc-shaped groove and divides the mounting groove into a supporting groove and a driving groove in the circumferential direction of the rotating hole; one end of the elastic piece is connected to the groove wall, away from the rotating shifting block, of the driving groove, and the other end of the elastic piece abuts against the rotating shifting block. The driving groove is filled with a driving body, and the driving body abuts against the rotating shifting block. The system can automatically adjust the temperature of the lubricating oil, has the characteristics of rapidness and high reliability, and can meet the requirement of rapid load change of a coal power unit under a novel power system.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbines, and in particular to a lubricating oil device for a tilting pad sliding bearing of a steam turbine and an oil temperature regulating method. Background Art

[0002] In order to adapt to the requirements of the new power system for rapid peak regulation of coal-fired power units, as well as the intermittent fluctuations of wind power and solar energy, coal-fired units often operate at ultra-low load and rapid load changes, resulting in unstable oil film between the turbine rotor and the bearing, and large fluctuations in shaft vibration, which seriously affect the safe and stable operation of the unit. The pressure and temperature of the bearing lubricating oil play an important role in the stability of the oil film. If the lubricating oil temperature is too high, the viscosity of the oil will decrease, the oil film will become thinner, and it will be easy to rupture, thereby causing local oil film damage, lubrication failure, reduced bearing load capacity, and may even cause carbonization of the lubricating oil and burn the bearing; if the lubricating oil temperature is too low, the viscosity of the oil will increase, resulting in thicker oil film, increased friction, increased bearing power consumption, and may also cause oil film vibration, resulting in increased turbine vibration.

[0003] Therefore, ensuring that the lubricating oil has a suitable temperature and sufficient supply pressure to maintain proper viscosity is an important means to prevent oil film rupture, bearing wear, and large vibration fluctuations in the shaft system. However, the traditional bearing lubricating oil temperature is adjusted by increasing the coolant flow rate using a lubricating oil cooling system, which has problems such as slow adjustment speed and inability to adapt to the rapid load change requirements of the unit. In order to solve the above problems, the present invention provides a steam turbine tilting pad sliding bearing lubricating oil device and an oil temperature adjustment method. Summary of the invention

[0004] The invention provides a steam turbine tilting pad sliding bearing lubricating oil device and an oil temperature regulating method, which can automatically regulate the lubricating oil temperature, has the characteristics of rapidity and high reliability, and can meet the needs of rapid load changes of coal-fired power units in new power systems.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A steam turbine tilting pad sliding bearing lubricating oil device is installed between two adjacent pads in the tilting pad sliding bearing, used to supply oil into the bearing and form an oil film driven by a rotor, comprising an oil inlet pipe and an oil supply pipe; The oil outlet end of the oil inlet pipe is provided with a mounting portion, the mounting portion is provided with a rotating hole, and the axis of the rotating hole is perpendicular to the axial direction of the oil supply pipe; The oil supply pipe is rotatably arranged on the rotating hole, the inner cavity of the oil supply pipe is communicated with the oil inlet pipe, and an oil injection hole is arranged on the outer wall of the oil supply pipe located outside the rotating hole; A rotating dial is provided on the outer sidewall of the part of the above-mentioned oil supply pipe located inside the rotating hole. An installation groove is provided on the inner sidewall of the rotating hole. An arc-shaped groove coaxial with the rotating hole is provided in the installation groove. The sliding end of the rotating dial slides on the arc-shaped groove and divides the installation groove along the circumferential direction of the rotating hole into a support groove and a driving groove; An elastic member is provided in the support groove. One end of the elastic member is connected to the groove wall of the driving groove far from the rotating dial, and the other end abuts against the rotating dial; The driving groove is filled with a driving body, and the driving body abuts against the rotating dial; When the volume of the driving body increases, it drives the rotating dial to rotate in the reverse direction, so that the fuel injection hole rotates towards the inlet of the oil supply side of the pad, or when the volume decreases, under the drive of the elastic member, the rotating dial rotates in the forward direction, so that the fuel injection hole rotates towards the center of the rotor.

[0006] Preferably, the driving body is a thermosensitive body made of a thermosensitive material, and the volume of the thermosensitive body changes under the influence of the oil film temperature; The thermosensitive body can be one of antimony, bismuth, gallium, etc.

[0007] Preferably, the driving body is lubricating oil. A communication hole is provided on the outer sidewall of the oil supply pipe close to the rotating dial to communicate the inner cavity of the oil supply pipe with the driving groove.

[0008] Preferably, a first oil inlet hole is provided at the lower part of the part of the oil supply pipe located in the rotating hole. A second oil inlet hole communicating with the inner cavity of the oil supply pipe is provided on the inner sidewall of the rotating hole, and the second oil inlet hole communicates with the first oil inlet hole; During the rotation of the oil supply pipe, the projection of the second oil inlet hole on the plane perpendicular to the axis of the oil supply pipe is always located within the projection of the first oil inlet hole on the plane perpendicular to the axis of the oil supply pipe.

[0009] Preferably, annular blocks are provided on both sides of the rotating hole, and an annular boss is provided in the middle of the oil supply pipe. The annular blocks are matched with the annular boss to seal the two ends of the rotating hole.

[0010] Preferably, the installation part includes an upper installation part and a lower installation part. The lower installation part is arranged at the upper end of the oil supply pipe. The upper installation part is detachably connected to the lower installation part, and the upper installation part and the lower installation part form the rotating hole and the annular boss.

[0011] An oil temperature regulation method for the lubricating oil device of the above-mentioned steam turbine tilting pad journal bearing includes: Collect the operating temperature of the oil film and compare the operating temperature of the oil film with a preset temperature; If the oil film temperature is within the threshold range of the preset temperature, the sliding end of the movable dial block is located at the middle position of the arc-shaped groove, the injection direction of the injection hole of the oil supply pipe is between the oil inlet side inlet of the pad and the rotor center, and the lubricating oil device operates in this state; If the oil film temperature is higher than the preset temperature, the volume of the driving body increases, the driving body drives the rotating dial block to rotate in the reverse direction, drives the oil supply pipe to rotate in the reverse direction, and makes the injection hole rotate towards the oil inlet side inlet of the pad until the collected oil film temperature is within the threshold range of the preset temperature and then stops; If the oil film temperature is lower than the preset temperature, the volume of the driving body decreases, and the elastic member drives the rotating dial block to rotate in the forward direction, drives the oil supply pipe to rotate in the forward direction, and makes the injection hole rotate towards the rotor center until the collected oil film temperature is within the threshold range of the preset temperature and then stops.

[0012] Preferably, the above driving body is a thermosensitive body made of thermosensitive material, and the method includes: If the oil film temperature is greater than the preset temperature, the thermosensitive body is affected by the oil film temperature and expands automatically, making the volume of the thermosensitive body increase. The thermosensitive body drives the rotating dial block to rotate in the reverse direction, drives the oil supply pipe to rotate in the reverse direction, and makes the injection hole rotate towards the oil inlet side inlet of the pad until the collected oil film temperature is within the threshold range of the preset temperature and then stops; If the oil film temperature is lower than the preset temperature, the thermosensitive body is affected by the oil film temperature and shrinks automatically, making the volume of the thermosensitive body decrease. The elastic member drives the rotating dial block to rotate in the forward direction, drives the oil supply pipe to rotate in the forward direction, and makes the injection hole rotate towards the rotor center until the collected oil film temperature is within the threshold range of the preset temperature and then stops.

[0013] Preferably, the above driving body is lubricating oil, and the method includes: If the oil film temperature is lower than the preset temperature, increase the power of the lubricating oil pump, the oil pressure increases, the lubricating oil in the inner cavity of the oil supply pipe continuously flows into the driving groove, the volume of the lubricating oil in the driving groove increases, drives the rotating dial block to rotate in the reverse direction, drives the oil supply pipe to rotate in the reverse direction, and makes the injection hole rotate towards the oil inlet side inlet of the pad until the collected oil film temperature is within the threshold range of the preset temperature and then stops; If the oil film temperature is lower than the preset temperature, reduce the power of the lubricating oil pump, the oil pressure decreases, the elastic member drives the rotating dial block to rotate in the forward direction, makes the lubricating oil in the driving groove flow out into the oil supply pipe, the volume of the lubricating oil in the driving groove decreases, and at the same time the rotating dial block drives the oil supply pipe to rotate in the forward direction, making the injection hole rotate towards the rotor center until the collected oil film temperature is within the threshold range of the preset temperature and then stops.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The driving body can automatically adjust its volume according to the oil film temperature or oil pressure. Thus, under the combined action of the elastic member, the rotating block is rotated, the oil supply pipe is rotated, and further the orientation of the oil injection hole is adjusted. Compared with the traditional method, it can automatically adjust the lubricating oil temperature, has the characteristics of high speed and high reliability, can meet the requirements of rapid load change of coal-fired generator sets under the new power system, and has good oil film stability in the bearing. Description of the Drawings

[0015] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic diagram of the overall tilting pad journal bearing in this embodiment of the present invention; Figure 2 It is a schematic sectional view of the lubricating oil device in this embodiment of the present invention (the driving body is a thermosensitive body); Figure 3 It is a schematic sectional view of the lubricating oil device in another embodiment of the present invention (the driving body is lubricating oil); Figure 4 It is a schematic diagram of the lubricating oil device in this embodiment of the present invention; Figure 5 It is a partial schematic diagram of the lubricating oil device in this embodiment of the present invention.

[0017] Description of the Reference Numerals in the Drawings: 1. Upper bearing body; 2. Lower bearing body; 3. Pad; 4. Oil baffle ring; 5. Lubricating oil device; 6. Inlet pipe; 7. Oil supply pipe; 71. Oil injection hole; 72. First inlet hole; 73. Communication hole; 8. Mounting part; 81. Upper mounting part; 82. Lower mounting part; 83. Rotating hole; 84. Annular baffle; 85. Second inlet hole; 86. Mounting groove; 861. Arc-shaped groove; 862. Driving groove; 863. Support groove; 9. Rotating block; 10. Elastic member; 11. Driving body. Detailed Embodiments

[0018] The following will clearly and completely describe the technical solutions of the present invention with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0021] As Figure 1 shown, the tilting pad journal bearing in the prior art generally includes a bearing body, pad blocks 3 and oil baffle rings 4. The bearing body includes an upper bearing body 1 and a lower bearing body 2. The upper bearing body 1 and the lower bearing body 2 are fixedly connected by bolts. A plurality of pad blocks 3 are circumferentially and uniformly installed on the inner circumference of the upper bearing body 1 and the lower bearing body 2. The pad blocks 3 are movably fixed on the inner ring of the bearing body through the axial positioning pins at the side centers, so as to realize slight radial swing, absorb the unbalanced force of the rotor, and is beneficial to improving the stability of the shafting. The oil baffle rings 4 are arranged on both axial sides of the bearing body to block the axial splashing of the jacking oil and lubricating oil. A lubricating oil device 5 is arranged in the gap between two adjacent pad blocks 3 to maintain the oil film and control the oil temperature and oil pressure. However, for the existing lubricating oil device 5, its oil injection holes 71 are generally fixedly oriented towards the center of the rotor. The change of the oil temperature can only be adjusted by increasing the coolant flow rate through the lubricating oil cooling system, resulting in problems such as slow adjustment speed and inability to meet the requirements of rapid load change of the unit.

[0022] To solve the above problems, as Figures 2 - 5As shown in the figure, an embodiment of the present invention provides a lubricating oil device for a tilting pad journal bearing of a steam turbine. The lubricating oil device 5 is installed in the gap between two adjacent pad blocks 3 for oil supply, and specifically includes an inlet pipe 6 and a supply pipe 7. An installation portion 8 is provided at the oil outlet end of the inlet pipe 6, and a rotation hole 83 is provided in the installation portion 8. The rotation hole 83 communicates with the oil supply inner cavity of the inlet pipe 6, and the axis of the rotation hole 83 is perpendicular to the axis of the inlet pipe 6, so that the rotation hole 83 is perpendicular to the inlet pipe 6, which is convenient for machining. Correspondingly, the middle part of the supply pipe 7 is rotatably and sealingly installed on the rotation hole 83. Sealing can adopt existing sealing means, such as adding an annular sealing ring, etc. The two ends of the supply pipe 7 are located outside the rotation hole 83, and the inner cavity of the supply pipe 7 communicates with the inlet pipe 6, so as to realize the supply of lubricating oil from the inlet pipe 6 to the supply pipe 7. An oil injection hole 71 is provided on the outer wall of the part of the supply pipe 7 located outside the rotation hole 83. By rotating the supply pipe 7 around the axis of the rotation hole 83, the orientation of the oil injection hole 71 can be changed, so that the oil injection hole 71 rotates within the area between the inlet side inlet of the pad block 3 and the rotor center, thereby improving the temperature of the oil film.

[0023] Specifically, in actual use, when the oil film temperature is within the specified preset temperature value range, it is the best temperature. At this time, the operation of the entire bearing is relatively stable, and the service life will also be extended. At this time, the oil injection hole 71 faces the middle area of the area between the inlet side inlet of the pad block 3 and the rotor center; when the oil film temperature is too high, the oil injection hole 71 can be rotated towards the inlet side inlet of the pad block 3. When rotated to a certain position, the inlet direction of the lubricating oil will deviate towards the inlet side inlet of the pad block 3, thus moving away from the rotor center. The lubricating oil forms an oil film under the drive of the rotation of the rotor. The temperature of the lubricating oil initially forming the oil film will be relatively low. During the continuous operation process, the overall oil film temperature will be improved and decreased, so that the oil film temperature drops to the specified value. It can be known that the closer the orientation of the oil injection hole 71 is to the inlet side inlet of the pad block 3, the lower the temperature of the finally formed oil film will be compared with that before adjustment; when the oil film temperature is too low, the oil injection hole 71 can be rotated towards the rotor center. When rotated to a certain position, more lubricating oil is directly sprayed onto the rotor, and then enters the gap between the pad block 3 and the rotor to form an oil film under the drive of the rotation of the rotor. Since the steam turbine rotor is driven by high-temperature steam, the temperature of the rotor itself is relatively high, so that the temperature of the lubricating oil initially forming the oil film will be relatively high. During the continuous operation process, the overall oil film temperature will be improved and increased, so that the oil film temperature rises to the specified value. It can be known that the closer the orientation of the oil injection hole 71 is to the rotor center, the higher the temperature of the finally formed oil film will be compared with that before adjustment.

[0024] Specifically, the specific structure for enabling the fuel supply pipe 7 and the fuel injection pipe to rotate is as follows: A rotating dial 9 is fixedly connected to the outer sidewall of the part of the fuel supply pipe 7 located inside the rotating hole 83. An installation groove 86 is provided on the inner sidewall of the rotating hole 83. The installation groove 86 is arc-shaped and coaxially arranged with the rotating hole 83. An arc-shaped groove 861 coaxial with the rotating hole 83 is provided in the installation groove 86. The end of the rotating dial 9 away from the fuel supply pipe 7 slides on the arc-shaped groove 861. Thus, the rotating dial 9 can only rotate circumferentially around the axis of the rotating hole 83 on the arc-shaped groove 861 to drive the fuel supply pipe 7 to rotate. The rotating dial 9 divides the installation groove 86 into a support groove 863 and a drive groove 862 along the circumferential direction of the rotating hole 83. And under the sealing of the outer sidewall of the fuel supply pipe 7, the support groove 863 and the drive groove 862 are two relatively sealed spaces. An elastic member 10 is provided in the support groove 863. The elastic member 10 can be an arc-shaped spring. One end of the elastic member 10 is connected to the groove wall of the drive groove 862 away from the rotating dial 9, and the other end abuts against the sidewall of the rotating dial 9. Correspondingly, a driving body 11 is filled in the drive groove 862. The driving body 11 abuts against the rotating dial 9. The volume of the driving body 11 can become larger or smaller under the influence of the external oil temperature or oil pressure. Thus, the volume of the drive groove 862 will become larger or smaller. Specifically, when the volume of the driving body 11 becomes larger, the drive groove 862 becomes larger, which can drive the rotating dial 9 to rotate in the reverse direction. The support groove 863 becomes smaller, and the elastic member 10 is compressed. The rotating dial 9 drives the fuel supply pipe 7 to rotate, making the fuel injection hole 71 rotate towards the oil inlet of the oil pad 3. The specific rotation position is determined according to the oil film temperature and the specified preset temperature. When the oil film temperature is within the specified preset temperature range, the rotation stops. Or when the volume of the driving body 11 becomes smaller, the drive groove 862 becomes smaller. Under the drive of the elastic member 10, the rotating dial 9 rotates in the forward direction. The support groove 863 becomes larger, and the rotating dial 9 drives the fuel supply pipe 7 to rotate, making the fuel injection hole 71 rotate towards the rotor center direction. The specific rotation position is determined according to the oil film temperature and the specified preset temperature. When the oil film temperature is within the specified preset temperature range, the rotation stops.

[0025] The above driving body 11 can automatically adjust its volume according to the oil film temperature or oil pressure. Thus, under the cooperative action of the elastic member 10, the rotating dial 9 rotates, the fuel supply pipe 7 rotates, and then the orientation of the fuel injection hole 71 is adjusted, making the orientation of the fuel injection hole 71 continuously change between the oil inlet of the oil pad 3 and the rotor center. Thus, the oil film temperature is reduced or increased. Compared with the traditional method, it can automatically adjust the lubricating oil temperature, has the characteristics of fast speed and high reliability, can meet the requirements of rapid load change of coal-fired generator sets under the new power system, and has good oil film stability in the bearing.

[0026] Specifically, in this embodiment, the driving body 11 is a thermosensitive body made of a thermosensitive material. The volume of the thermosensitive body changes with the oil film temperature. Since the installation part 8 is located between the two pads 3 and its exterior will come into contact with the oil film, through heat conduction, the thermosensitive body in the driving groove 862 will be heated. The volume of the thermosensitive body changes according to the change of the external oil film temperature. When the oil film temperature rises, the volume of the thermosensitive body increases; when the oil film temperature drops, the volume of the thermosensitive body will relatively shrink. Of course, the entire installation part 8 is in an annular structure, making its outer side wall arc-shaped, so that the bottom wall of the driving groove 862 is thinner and has a uniform thickness, making the thermal contact of the thermosensitive body more uniform and its heat reception better. Specifically, the thermosensitive body can be one of antimony, bismuth, gallium, etc.

[0027] Specifically, in another embodiment, the driving body 11 can be lubricating oil. A communication hole 73 is provided on the outer side wall of the oil supply pipe 7 close to the rotating block 9, so that the inner cavity of the oil supply pipe 7 communicates with the driving groove 862. When the lubricating oil device 5 is in use, the lubricating oil enters the oil supply pipe 7 from the inlet pipe 6, and then is supplied to the bearing through the spray pipe from the inner cavity of the oil supply pipe 7. At the same time, the lubricating oil in the inner cavity of the oil supply pipe 7 will enter the driving groove 862 through the communication hole 73. When the driving groove 862 is filled with lubricating oil, it will continuously apply pressure to the rotating block 9. Under the action of the elastic member 10, the rotating block 9 is in a balanced state. Once the oil pressure increases, the lubricating oil will continue to enter the driving groove 862, causing the volume of the driving groove 862 to increase, forcing the rotating block 9 to slide in the arc-shaped groove 861 and compressing the elastic member 10, so that the injection hole 71 rotates towards the inlet of the oil inlet side of the pad 3. Once the oil pressure drops, the elastic member 10 will force the rotating block 9 to slide in the arc-shaped groove 861, and the lubricating oil will flow out of the driving groove 862 under the action of the elastic member 10. The volume of the driving groove 862 decreases, the oil supply pipe 7 rotates, and the injection hole 71 rotates towards the center direction of the rotor, thus achieving the purpose of using lubricating oil and adjusting the orientation of the injection hole 71 through the oil pressure.

[0028] Specifically, a first oil inlet hole 72 is provided at the lower part of the oil supply pipe 7 at the rotating hole 83 part, and a second oil inlet hole 85 communicating with the inner cavity of the inlet pipe 6 is provided on the inner side wall of the rotating hole 83. The second oil inlet hole 85 communicates with the first oil inlet hole 72, so that the lubricating oil in the inlet pipe 6 enters the oil supply pipe 7. And during the rotation of the oil supply pipe 7, the projection of the second oil inlet hole 85 on the plane perpendicular to the axis of the inlet pipe 6 is always within the projection of the first oil inlet hole 72 on the plane perpendicular to the axis of the inlet pipe 6, thereby ensuring that the oil inlet aperture of the second oil inlet hole 85 does not change, ensuring the stability of the oil pressure entering the oil supply pipe 7, and ensuring the injection rate of the injection hole 71, so that the oil inlet aperture of the oil supply pipe 7 will not change due to the rotation of the oil supply pipe 7, causing a large change in the oil pressure.

[0029] Specifically, annular stoppers 84 are provided on both sides of the rotation hole 83. Correspondingly, an annular boss is provided in the middle of the oil supply pipe 7. The annular stopper 84 cooperates with the annular boss to strengthen the rotational seal of the oil supply pipe 7.

[0030] Specifically, the installation part 8 includes an upper installation part 81 and a lower installation part 82. The lower installation part 82 is integrally provided at the upper end of the oil inlet pipe 6. The upper installation part 81 is detachably connected to the lower installation part 82, which facilitates the installation of the oil supply pipe 7 on the rotation hole 83. Moreover, semi-circular through grooves are provided inside both the upper installation part 81 and the lower installation part 82, and semi-circular annular stoppers 84 are provided at the ends of the through grooves. After the upper installation part 81 and the lower installation part 82 are connected, the rotation hole 83 and the annular boss are formed.

[0031] The embodiment of the present invention also provides an oil temperature regulation method, which is implemented based on the above-mentioned steam turbine tilting pad journal bearing lubricating oil device, and specifically includes: First, collect the oil film operating temperature and compare the oil film operating temperature with a preset temperature. Specifically, the collection of the oil film temperature may belong to the prior art. However, in this embodiment, an inclined groove is provided in the pad 3, and a temperature sensor is provided in the inclined groove for detecting the temperature. The end of the inclined groove is located at the center of the pad 3. Since the oil film between the pad 3 and the rotor is thinnest at the center of the pad 3, the highest temperature of the pad 3, that is, the highest temperature of the oil film, can be monitored. Generally, the preset temperature is a temperature value determined through a large number of experiments by humans. The preset temperature is a threshold range. At the preset temperature, the operation of the bearing can be made more stable.

[0032] After comparing the oil film operating temperature with the preset temperature, there are several situations. The first one: If the oil film temperature is within the threshold range of the preset temperature, the sliding end of the movable slider is generally located at the middle position of the arc-shaped groove 861, and the spraying direction of the spraying hole 71 of the oil supply pipe 7 is between the oil inlet side inlet of the pad 3 and the rotor center. The lubricating oil device 5 can maintain this state and continue to operate. The second one: If the oil film temperature is higher than the preset temperature, that is, higher than the maximum value of the preset temperature, the volume of the driving body 11 is increased, and the driving body 11 drives the rotating slider 9 to rotate in the reverse direction, driving the oil supply pipe 7 to rotate in the reverse direction, so that the spraying hole 71 rotates towards the oil inlet side inlet of the pad 3, so that the initial temperature of the oil film formed by the lubricating oil is lower, so that the oil film temperature after work can reach within the threshold range of the preset temperature, and then stop rotating. The third one: If the oil film temperature is lower than the preset temperature, that is, lower than the minimum value of the preset temperature, the volume of the driving body 11 is decreased, and the elastic member 10 drives the rotating slider 9 to rotate in the forward direction, driving the oil supply pipe 7 to rotate in the forward direction, so that the spraying hole 71 rotates towards the rotor center direction until the collected oil film temperature is within the threshold range of the preset temperature and stops.

[0033] It can be known that the rotation speed of the above-mentioned rotor is very fast, so the temperature of the oil film is constantly changing. Therefore, the rotation of the entire oil supply pipe 7 is also continuous. Correspondingly, a lubricating oil device 5 is provided between every two adjacent pads 3, and a temperature measuring component (i.e., the above-mentioned temperature sensor, installed in the inclined groove) is provided in each pad 3. As long as the value of the temperature measuring component in the corresponding pad 3 is within the threshold range of the preset temperature, the oil supply pipe 7 in the lubricating oil device 5 next to the pad 3 also maintains the corresponding working state unchanged. Once the value of the temperature measuring component is not within the threshold range of the preset temperature, the oil supply pipe 7 in the lubricating oil device 5 next to the pad 3 rotates correspondingly.

[0034] In the above method, the traditional injection hole 71 of the oil injection hole cannot be adjusted, and the temperature can only be adjusted through the lubricating oil cooling system. The adjustment speed is slow, which is not conducive to timely response and cannot meet the requirements of rapid load change of coal-fired power generation units under the new power system. As a result, the stability of the oil film is poor, and rubbing and large vibration fluctuations often occur.

[0035] Specifically, in this embodiment, the driving body 11 is a thermosensitive body made of thermosensitive material. The method specifically includes: if the oil film temperature is greater than the preset temperature, that is, greater than the maximum value of the preset temperature, the thermosensitive body is affected by the oil film temperature and automatically expands, so that the volume of the thermosensitive body becomes larger. The thermosensitive body drives the rotating block 9 to rotate in the reverse direction, driving the oil supply pipe 7 to rotate in the reverse direction, so that the injection hole 71 rotates towards the inlet side of the pad 3 until the collected oil film temperature is within the threshold range of the preset temperature and stops; if the oil film temperature is less than the preset temperature, that is, less than the minimum value of the preset temperature, the thermosensitive body is affected by the oil film temperature and automatically shrinks, so that the volume of the thermosensitive body becomes smaller. The elastic member 10 drives the rotating block 9 to rotate in the forward direction, driving the oil supply pipe 7 to rotate in the forward direction, so that the injection hole 71 rotates towards the center of the rotor until the collected oil film temperature is within the threshold range of the preset temperature and stops. The advantage of using the thermosensitive body as the driving body 11 is that it can automatically adjust according to the temperature of the oil film without too much human participation and the response is more timely.

[0036] In another embodiment, the driving body 11 is lubricating oil, and the method specifically includes: if the oil film temperature is less than the preset temperature, that is, greater than the maximum value of the preset temperature, the power of the lubricating oil pump can be increased to increase the oil pressure, so that the lubricating oil in the inner cavity of the oil supply pipe 7 continuously flows into the driving groove 862, the volume of the lubricating oil in the driving groove 862 increases, the driving rotating block 9 rotates reversely, drives the oil supply pipe 7 to rotate reversely, and makes the oil injection hole 71 rotate towards the inlet direction of the oil inlet side of the shoe 3 until the collected oil film temperature is within the threshold range of the preset temperature and stops; if the oil film temperature is less than the preset temperature, that is, less than the minimum value of the preset temperature, the power of the lubricating oil pump is reduced, the oil pressure is reduced, and the elastic member 10 drives the rotating block 9 to rotate forward, so that the lubricating oil in the driving groove 862 flows out into the oil supply pipe 7, the volume of the lubricating oil in the driving groove 862 decreases, and at the same time the rotating block 9 drives the oil supply pipe 7 to rotate forward, so that the oil injection hole 71 rotates towards the rotor center direction until the collected oil film temperature is within the threshold range of the preset temperature and stops. Controlling the rotation direction of the oil injection hole 71 through the external oil pressure has higher operability, and it is easier for external operators to intervene and is more convenient to use.

[0037] The above embodiments are only the preferred embodiments of the present invention, and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention belong to the scope of protection required by the present invention.

Claims

1. A lubricating oil device for a tilting pad journal bearing of a steam turbine, which is installed between two adjacent pad blocks inside the tilting pad journal bearing and is used to supply oil into the bearing and form an oil film driven by the rotor. It is characterized in that, It includes an inlet pipe and a supply pipe; An installation part is arranged at the oil outlet end of the inlet pipe. The installation part is provided with a rotation hole, and the axis of the rotation hole is perpendicular to the axial direction of the supply pipe; The supply pipe is rotatably arranged on the rotation hole, its inner cavity is communicated with the inlet pipe, and an oil injection hole is arranged on the outer side wall of the part of the supply pipe located outside the rotation hole; A rotation dial is arranged on the outer side wall of the part of the supply pipe located inside the rotation hole. An installation groove is arranged on the inner side wall of the rotation hole. An arc groove coaxial with the rotation hole is arranged in the installation groove. The sliding end of the rotation dial slides on the arc groove and divides the installation groove along the circumferential direction of the rotation hole into a support groove and a drive groove; An elastic member is arranged in the support groove. One end of the elastic member is connected to the groove wall of the drive groove far away from the rotation dial, and the other end abuts against the rotation dial; The drive groove is filled with a driving body, and the driving body abuts against the rotation dial; When the volume of the driving body increases, it drives the rotation dial to rotate in the reverse direction, so that the oil injection hole rotates towards the inlet of the oil inlet side of the shoe. Or when the volume decreases, under the drive of the elastic member, the rotation dial rotates in the forward direction, so that the oil injection hole rotates towards the center of the rotor.

2. The sliding bearing lubricating oil device according to claim 1, wherein The driving body is a thermosensitive body made of a thermosensitive material, and the volume of the thermosensitive body changes under the influence of the oil film temperature; The thermosensitive body can be one of antimony, bismuth, gallium, etc.

3. The sliding bearing lubricating oil device according to claim 1, characterized in that, The driving body is lubricating oil. A communication hole is arranged on the outer side wall of the supply pipe close to the rotation dial, so that the inner cavity of the supply pipe is communicated with the drive groove.

4. The sliding bearing lubricating oil device according to claim 1, characterized in that, A first oil inlet hole is arranged at the lower part of the part of the supply pipe located in the rotation hole. A second oil inlet hole communicated with the inner cavity of the inlet pipe is arranged on the inner side wall of the rotation hole, and the second oil inlet hole is communicated with the first oil inlet hole; During the rotation of the supply pipe, the projection of the second oil inlet hole on the plane perpendicular to the axis of the inlet pipe is always located within the projection of the first oil inlet hole on the plane perpendicular to the axis of the inlet pipe.

5. The sliding bearing lubricating oil device according to claim 1, characterized in that, Annular stoppers are arranged on both sides of the rotation hole. An annular boss is arranged in the middle of the supply pipe. The annular stopper is matched with the annular boss to seal the two ends of the rotation hole.

6. The sliding bearing lubricating oil device according to claim 5, characterized in that, The installation part includes an upper installation part and a lower installation part. The lower installation part is arranged at the upper end of the inlet pipe. The upper installation part is detachably connected to the lower installation part, and the upper installation part and the lower installation part form the rotation hole and the annular boss.

7. A method for regulating oil temperature, which is implemented based on the lubricating oil device of the tilting pad journal bearing of the steam turbine according to any one of claims 1-6, characterized in that, It includes: Collect the running temperature of the oil film and compare the running temperature of the oil film with a preset temperature; If the oil film temperature is within the threshold range of the preset temperature, the sliding end of the movable dial is located at the middle position of the arc groove, the injection direction of the oil injection hole of the supply pipe is between the inlet of the oil inlet side of the shoe and the center of the rotor, and the lubricating oil device operates in this state; If the oil film temperature is higher than the preset temperature, the volume of the driving body is increased, the driving body drives the rotation dial to rotate in the reverse direction, drives the supply pipe to rotate in the reverse direction, so that the oil injection hole rotates towards the inlet of the oil inlet side of the shoe until the collected oil film temperature is within the threshold range of the preset temperature and stops; If the oil film temperature is lower than the preset temperature, the volume of the driving body decreases, and the elastic member drives the rotating block to rotate forward, driving the oil supply pipe to rotate forward, so that the oil injection hole rotates towards the rotor center direction until the collected oil film temperature stops within the threshold range of the preset temperature.

8. The oil temperature adjustment method according to claim 7, characterized in that, The driving body is a thermosensitive body made of thermosensitive material, and the method includes: If the oil film temperature is higher than the preset temperature, the thermosensitive body is affected by the oil film temperature and expands automatically, causing the volume of the thermosensitive body to increase. The thermosensitive body drives the rotating block to rotate reversely, driving the oil supply pipe to rotate reversely, so that the oil injection hole rotates towards the inlet direction of the oil inlet side of the shoe until the collected oil film temperature stops within the threshold range of the preset temperature; If the oil film temperature is lower than the preset temperature, the thermosensitive body is affected by the oil film temperature and shrinks automatically, causing the volume of the thermosensitive body to decrease. The elastic member drives the rotating block to rotate forward, driving the oil supply pipe to rotate forward, so that the oil injection hole rotates towards the rotor center direction until the collected oil film temperature stops within the threshold range of the preset temperature.

9. The oil temperature regulation method according to claim 7, wherein The driving body is lubricating oil, and the method includes: If the oil film temperature is lower than the preset temperature, increase the power of the lubricating oil pump, the oil pressure increases, and the lubricating oil in the inner cavity of the oil supply pipe continuously flows into the driving groove. The volume of the lubricating oil in the driving groove increases, driving the rotating block to rotate reversely, driving the oil supply pipe to rotate reversely, so that the oil injection hole rotates towards the inlet direction of the oil inlet side of the shoe until the collected oil film temperature stops within the threshold range of the preset temperature; If the oil film temperature is lower than the preset temperature, reduce the power of the lubricating oil pump, the oil pressure decreases, and the elastic member drives the rotating block to rotate forward, causing the lubricating oil in the driving groove to flow out into the oil supply pipe. The volume of the lubricating oil in the driving groove decreases. At the same time, the rotating block drives the oil supply pipe to rotate forward, so that the oil injection hole rotates towards the rotor center direction until the collected oil film temperature stops within the threshold range of the preset temperature.

Images