CN110715753A - Device and method for online monitoring of oil film temperature of composite material thrust bearing - Google Patents
Device and method for online monitoring of oil film temperature of composite material thrust bearing Download PDFInfo
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- CN110715753A CN110715753A CN201911177242.7A CN201911177242A CN110715753A CN 110715753 A CN110715753 A CN 110715753A CN 201911177242 A CN201911177242 A CN 201911177242A CN 110715753 A CN110715753 A CN 110715753A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
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Abstract
The invention provides a device and a method for monitoring the temperature of an oil film on line by a composite material thrust bearing, wherein the device comprises the composite material thrust bearing and an on-line oil film temperature monitoring assembly, and the composite material thrust bearing mainly comprises a tile matrix and a composite material tile surface arranged on the tile matrix; the composite material thrust bearing is provided with a tapered step-shaped mounting hole for mounting an on-line oil film temperature monitoring assembly, the mounting hole penetrates through the tile base body and the composite material tile surface, the axis of the mounting hole is perpendicular to the composite material tile surface, and the mounting hole is arranged at the highest position of the oil film temperature of the composite material thrust bearing; a U-shaped oil drainage groove is formed in the tile surface of the composite material; the online oil film temperature monitoring assembly comprises an oil film temperature sensor and a sensor heat insulation sleeve sleeved outside a probe of the oil film temperature sensor. The invention can accurately monitor the highest oil film temperature of the composite material thrust bearing bush surface on line, judge the running state of the bearing and overcome the problem that the temperature measurement error of the bush body is large in the prior art, so that the alarm is delayed and accidents are easily caused.
Description
Technical Field
The invention relates to the technical field of bearing oil film temperature measurement, in particular to a device and a method for monitoring the oil film temperature of a composite material thrust bearing on line.
Background
The composite material thrust bearing has the advantages of high specific strength, good fatigue resistance, good antifriction and wear resistance and the like, and can replace the traditional babbit metal bearing bush to be widely applied to the fields of hydroelectric power generation equipment, mill gear boxes, metallurgical equipment, military industry and the like. When the bearing runs, if the temperature of the oil film is too high, the viscosity of lubricating oil is reduced, the bearing is further influenced to establish a pressure oil film with enough thickness, if the temperature cannot be controlled in time, the bearing burning accident can be caused, and therefore, the real-time monitoring of the temperature of the oil film of the composite material thrust bearing is an important means for ensuring the safe running of a unit.
In the prior art, a conventional monitoring method for monitoring the temperature of a babbitt metal bearing bush is mostly used, that is, as shown in fig. 1, a composite material thrust bearing comprises a bush base body and a thrust bearing composite material bush surface arranged on the bush base body, a temperature sensor is inserted into a bush base temperature sensor mounting hole from the outer diameter of the bush base along the direction perpendicular to the tangent line of the outer diameter, and the measured temperature of the bush base is used for judging the running state of the composite material thrust bearing. Because the bearing composite material tile surface has heat resistance, the temperature gradient between the monitored tile base and the oil film temperature of the composite material tile surface is very large, and the actual running state of the bearing cannot be truly reflected. And when the temperature of an oil film is suddenly increased due to abnormal operation of the bearing, the temperature of the monitored tile base body has a serious hysteresis phenomenon, so that the unit cannot alarm and control in time, and therefore a tile burning accident happens sometimes.
In order to solve the problems of the conventional method for monitoring the temperature of the bearing of the composite material thrust bearing, the prior art provides a plurality of methods for judging the running state of the bearing by monitoring the temperature of an oil film of the bearing. In one of the methods, as shown in fig. 2, a temperature sensor mounting hole is processed in a bearing area of a composite material pad surface of a composite material thrust bearing along a direction perpendicular to the pad surface, the temperature sensor is embedded in the mounting hole, and the temperature measuring end of the sensor is lower than the composite material pad surface, so that the purpose of monitoring the temperature of a bearing oil film in real time is achieved, and the real running state of the bearing is further reflected. Firstly, an oil drainage channel is not processed on the composite material tile surface in the technology, so that a small amount of lubricating oil is trapped in a hole reserved above the probe end part of the temperature sensor when the bearing runs, and as the lubricating oil flows from the oil inlet side of the bearing to the oil outlet side, the oil pressure generated by the lubricating oil can cause the phenomena of bulging or cracking and the like at the position, close to the oil outlet side, of an orifice of a temperature sensor mounting hole along with the lapse of time, and further the composite material tile surface is damaged; meanwhile, impurities doped in the lubricating oil can be accumulated in the holes, and the accuracy of temperature monitoring is influenced. Secondly, when the temperature sensor is installed on the bearing, no sealing measure is taken, and the lubricating oil permeates into the pore to cause the pressure of the pressure oil film to be relieved.
Another method is to provide a mounting groove for mounting a temperature sensor device at the oil outlet side of the composite material thrust bearing, and provide an opening facing the oil outlet side, wherein the temperature sensor device is fixed in the mounting groove, and can monitor the temperature of the oil film above the oil outlet side of the bearing in real time, as shown in fig. 3. Due to the limitation of the position of the mounting groove, the temperature measuring end of the temperature sensor device is still a certain distance away from the region with the highest oil film temperature; in addition, the sealing measures adopted by the technology aim at isolating the temperature measuring end part from lubricating oil in the oil groove, but the lubricating oil can also flow out along with the gap of the mounting groove, so that the oil film is decompressed, and cold oil flows back to mix into the measuring temperature, and the temperature is distorted.
At present, a method for monitoring the temperature of an oil film of a composite material thrust bearing is also provided. As shown in fig. 4, an oil film temperature measuring element is arranged in the area of the oil outlet end of the composite material tile surface close to the outer diameter, and the measuring element comprises: the temperature sensor selects an end part measuring type, the heat insulation sleeve is arranged at a temperature sensor sensing part, the temperature sensor is arranged in a mounting hole groove from a tile base to a tile surface direction, the distance between the end part of the temperature sensor and the tile surface is 0.7-1.0 mm, and a temperature sensor oil discharge channel is machined on the tile surface. This technique has the following disadvantages: (1) the position of the temperature sensor is not specifically described, and the obtained bearing oil film temperature data is not necessarily the highest value of the oil film temperature; (2) the size range of the orifice of the mounting hole processed on the composite material tile surface is not specified, and if the size of the orifice is overlarge, the continuity of the establishment of the pressure oil film is influenced, and the stable operation of the bearing is influenced; (3) the maximum value of the depth of the oil drainage groove is not specified, if the depth of the oil drainage groove is too deep, the accuracy of oil film temperature measurement can be influenced, and if the depth of the oil drainage groove is too shallow, pollutant deposition can be caused after the oil drainage groove is ground to be flat, and the accuracy of temperature measurement can be influenced.
Although the prior art improves the traditional composite material bearing operation temperature monitoring method, a more effective and reliable monitoring method is not provided all the time, so that the error of tile body temperature measurement is large, and the alarm is delayed, thereby easily causing accidents. Therefore, the conventional method for measuring the temperature of the hydroelectric power station still adopts the conventional method for measuring the temperature by using the babbitt metal tile body.
Disclosure of Invention
According to the technical problem that the oil film temperature of the composite material thrust bearing cannot be timely and accurately monitored by the conventional monitoring method, the error in the measurement of the temperature of the tile body is large, and the alarm is delayed, so that accidents are easily caused, and the device and the method for online monitoring the oil film temperature of the composite material thrust bearing are provided. The oil film temperature sensor is arranged at the position with the highest oil film temperature, the end part of the probe is only 1.5-2 mm away from the composite material tile surface, the end part of the probe of the oil film temperature sensor is arranged in the area with the highest pressure oil film temperature, the U-shaped oil drainage groove is arranged by combining the composite material tile surface, the depth of the U-shaped oil drainage groove is specified, and the interference of lubricating oil in the oil groove on temperature monitoring is avoided, so that the oil film temperature of the composite material thrust bearing is timely and accurately monitored, the running state of the bearing is judged, the error caused by tile body temperature measurement is overcome, and the running safety of a unit is guaranteed.
The technical means adopted by the invention are as follows:
a device for monitoring the temperature of an oil film on line for a composite material thrust bearing comprises the composite material thrust bearing and an on-line oil film temperature monitoring assembly, wherein the composite material thrust bearing mainly comprises a tile base body and a composite material tile surface arranged on the tile base body; the composite material thrust bearing is provided with a tapered step-shaped mounting hole for mounting the on-line oil film temperature monitoring assembly, the mounting hole penetrates through the tile base body and the composite material tile surface, the axis of the mounting hole is perpendicular to the composite material tile surface and is arranged at the highest position of the oil film temperature of the composite material thrust bearing, and the highest position of the oil film temperature of the composite material thrust bearing is determined according to the calculation result of finite element analysis software;
the composite tile surface is provided with a U-shaped oil drainage groove in the horizontal direction, the U-shaped oil drainage groove is communicated with the mounting hole and accommodates an orifice at the top of the mounting hole on the composite tile surface, the circular arc axis at one side of the U-shaped oil drainage groove is superposed with the axis of the mounting hole, the circle center of the circular arc is positioned on the axis of the mounting hole, and the opening at the other side of the U-shaped oil drainage groove faces an oil outlet edge;
the online oil film temperature monitoring assembly comprises an oil film temperature sensor and a sensor heat insulation sleeve sleeved outside a probe of the oil film temperature sensor, the inner diameter of the sensor heat insulation sleeve is matched with the outer diameter of the probe of the oil film temperature sensor, the end part of the probe of the oil film temperature sensor is flush with the end face of the sensor heat insulation sleeve, and the outer diameter of the sensor heat insulation sleeve is matched with the inner diameter of the mounting hole;
the middle part of the oil film temperature sensor is provided with a threaded section, and the threaded section is coated with an oxygen-resistant sealant to ensure that the oil film temperature sensor is completely filled in a gap between an external thread of the threaded section and an internal thread of a threaded hole, so that the looseness of the sensor and the leakage of lubricating oil caused by long-time impact and vibration can be avoided;
the flange end face of the oil film temperature sensor is tightly attached to the step in the mounting hole, so that the pressure relief phenomenon caused by the infiltration of lubricating oil can be prevented. The flange end face of the oil film temperature sensor refers to the end face of the threaded section, namely the end face connected with the probe in the threaded section.
Furthermore, the diameter of the oil film temperature sensor probe is less than or equal to 3 mm.
Furthermore, the end part of the probe of the oil film temperature sensor is lower than the top of the tile surface of the composite material, the distance between the end part of the probe of the oil film temperature sensor and the top of the tile surface of the composite material is 1.5-2 mm, and the end part of the probe of the oil film temperature sensor is arranged in a region with the highest pressure oil film temperature, so that the highest oil film temperature of the thrust bearing of the composite material can be timely and accurately monitored, and the running safety of a unit is guaranteed.
Furthermore, the thread section of the oil film temperature sensor adopts a sealing pipe thread with sealing capacity, connection tightness is guaranteed by means of deformation of thread teeth, and the oil film temperature sensor has a good sealing effect.
Furthermore, the mounting hole with the tapered ladder shape is formed by communicating a tapered second through hole, a threaded hole and a first through hole, and the second through hole is used for accommodating a bottom nut on the oil film temperature sensor; the internal thread of the threaded hole is matched and connected with the external thread of the threaded section, and the coated oxygen-resistant sealant is completely filled in a gap between the external thread of the threaded section and the internal thread of the threaded hole; the first through hole is in clearance fit with the outer diameter of the heat insulation sleeve of the sensor, wherein the diameter of the first through hole is less than or equal to 4mm, so that the tile surface of the composite material can be damaged negligibly, and the continuity of a pressure oil film cannot be influenced.
Further, the radius of the arc on one side of the U-shaped oil drainage groove is larger than that of the first through hole, and the difference between the radius of the arc and the radius of the first through hole is 0.5-10 mm.
Furthermore, the height from the bottom of the U-shaped oil drainage groove to the top of the tile surface made of the composite material is 0.1-0.2 mm, so that the interference of lubricating oil in the U-shaped oil drainage groove on temperature monitoring can be avoided.
The invention also provides a method for monitoring the oil film temperature of the composite material thrust bearing on line, which comprises the following steps:
s1, sleeving the sensor heat insulation sleeve outside the probe of the oil film temperature sensor;
s2, uniformly coating sufficient oxygen-resistant sealant on the threaded section of the oil film temperature sensor to ensure that the sealant is completely filled in a gap between the external thread of the threaded section in the oil film temperature sensor and the internal thread of the threaded hole in the mounting hole;
s3, before the oxygen-resistant sealant is solidified, screwing the online oil film temperature monitoring assembly into the threaded hole of the mounting hole, and ensuring that the flange end face of the oil film temperature sensor is tightly attached to the step between the first through hole and the threaded hole in the mounting hole;
s4, installing the composite material bearing and the online oil film temperature monitoring assembly in a unit, fixing the oil film temperature sensor cable along the bottom of an oil tank of the unit by a fixing wire clamp, leading out from an outlet of the oil tank of the unit, entering a signal acquisition module, processing the signal by a photoelectric conversion signal, and transmitting the signal to a programmable controller for temperature storage and analysis;
and S5, starting the unit, operating under the conditions of a certain rotating speed and load, measuring a sensor signal in real time by the oil film temperature sensor, and displaying the analyzed data in real time on the upper computer.
Compared with the prior art, the invention has the following advantages:
1. according to the device and the method for monitoring the oil film temperature of the composite material thrust bearing on line, provided by the invention, the oil film temperature sensor is arranged at the position with the highest oil film temperature, and the distance between the probe end part of the oil film temperature sensor and the tile surface of the composite material is only 1.5-2 mm, so that the probe end part of the oil film temperature sensor is arranged in the region with the highest pressure oil film temperature, and therefore, the highest oil film temperature of the composite material thrust bearing can be timely and accurately monitored, and the running safety of a unit is guaranteed.
2. According to the device and the method for monitoring the oil film temperature of the composite material thrust bearing on line, the special sensor heat insulation sleeve is arranged on the oil film temperature sensor probe, the oil film temperature is monitored only by using the end part of the oil film temperature sensor probe, and the influence of a small amount of lubricating oil in the mounting hole on monitoring data is reduced.
3. According to the device and the method for monitoring the oil film temperature of the composite material thrust bearing on line, the thread section of the oil film temperature sensor adopts the sealing pipe thread, the connection tightness is ensured by means of the deformation of the thread teeth, and a good sealing effect is achieved; in addition, the oil film temperature sensor is coated with enough oxygen-resistant sealant on the screw thread in advance before installation, so that the looseness of the sensor and the leakage of lubricating oil caused by long-time impact and vibration are avoided; meanwhile, the flange end face of the oil film temperature sensor is tightly attached to the step in the mounting hole, so that the pressure relief phenomenon caused by the infiltration of lubricating oil is prevented.
4. The device and the method for monitoring the oil film temperature of the composite material thrust bearing on line provided by the invention stipulate that the size of an orifice at the top of a mounting hole processed on the composite material tile surface is required to be less than or equal to 4mm, the damage to the composite material tile surface can be ignored, and the continuity of a pressure oil film cannot be influenced.
5. According to the device and the method for monitoring the oil film temperature of the composite material thrust bearing on line, the composite material tile surface is provided with the U-shaped oil drainage groove, so that the phenomenon that the tile surface is damaged due to the fact that lubricating oil is trapped in a hole reserved above the end part of a probe of a temperature sensor is prevented; meanwhile, the U-shaped oil drainage channel is beneficial to the circulation of lubricating oil at the probe end part of the oil film temperature sensor, and the accumulation of impurities is prevented, so that the accuracy of oil film temperature monitoring data is ensured; the depth of the U-shaped oil drainage groove is specified, so that the interference of lubricating oil in the U-shaped oil drainage groove on temperature monitoring is avoided; in addition, when the unit overhauls, can judge the bearing degree of wear through observing the degree of depth change in U type draining groove.
In conclusion, the technical scheme of the invention can solve the problem that the existing monitoring method in the prior art cannot timely and accurately monitor the oil film temperature of the composite material thrust bearing, so that the error in the measurement of the temperature of the tile body is large, and the alarm is delayed, thereby easily causing accidents.
Based on the reason, the method can be widely popularized in the fields of bearing oil film temperature measurement and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a composite material thrust bearing temperature measurement assembly in the prior art.
Fig. 2 is a schematic structural diagram of a second composite material thrust bearing temperature measurement assembly in the prior art.
FIG. 3 is a schematic structural diagram of a third composite material thrust bearing temperature measurement assembly in the prior art.
FIG. 4 is a schematic structural diagram of a fourth composite material thrust bearing temperature measurement assembly in the prior art.
FIG. 5 is a schematic structural diagram of a temperature measurement assembly of the composite thrust bearing of the present invention.
FIG. 6 is a sectional view of the temperature measurement assembly of the composite thrust bearing of the present invention.
Fig. 7 is a temperature monitoring curve diagram of a simulated hydroelectric generating set working condition test in the invention.
In the figure: 1. a tile base; 2. a composite tile face; 3. an oil film temperature sensor; 31. a probe; 32. a flange end face; 33. a threaded segment; 34. a nut; 4. a sensor heat shield sleeve; 5. mounting holes; 51. a first through hole; 52. a threaded hole; 53. a second through hole; 6. u type draining groove.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
Example 1
As shown in fig. 5-6, the invention provides a device for online monitoring of oil film temperature of a composite material thrust bearing, which comprises a composite material thrust bearing and an online oil film temperature monitoring assembly, wherein the composite material thrust bearing mainly comprises a tile base body 1 and a composite material tile surface 2 arranged on the tile base body 1; the composite material thrust bearing is provided with a tapered stepped mounting hole 5 for mounting an on-line oil film temperature monitoring assembly, the mounting hole 5 penetrates through the tile base body 1 and the composite material tile surface 2, the axis of the mounting hole 5 is perpendicular to the composite material tile surface 2 and is arranged at the highest position of the oil film temperature of the composite material thrust bearing, and the highest position of the oil film temperature of the composite material thrust bearing is determined according to a finite element analysis software calculation result. The mounting hole 5 with the tapered step shape is that the mounting hole 5 is provided with a tapered second through hole 53, a threaded hole 52 and a first through hole 51 which are communicated with each other, and the second through hole 53 is used for accommodating the bottom nut 34 on the oil film temperature sensor 3; the internal thread of the threaded hole 52 is matched and connected with the external thread of the threaded section 33, and the coated oxygen-resistant sealant is completely filled in a gap between the external thread of the threaded section 33 and the internal thread of the threaded hole 52. The first through hole 51 is in clearance fit with the outer diameter of the sensor heat insulation sleeve 4, wherein the diameter of the first through hole 51 is less than or equal to 4mm, so that the damage to the composite material tile surface 2 can be ignored, and the continuity of a pressure oil film cannot be influenced.
The composite tile surface 2 is provided with a U-shaped oil drainage groove 6 in the horizontal direction, the U-shaped oil drainage groove 6 is communicated with the mounting hole 5, the orifice at the top of the mounting hole 5 on the composite tile surface 2 is contained, the circular arc axis on one side of the U-shaped oil drainage groove 6 coincides with the axis of the mounting hole 5, the circle center of the circular arc is located on the axis of the mounting hole 5, and the opening on the other side of the U-shaped oil drainage groove 6 faces towards the oil outlet edge. The radius of the circular arc on one side of the U-shaped oil drainage groove 6 is larger than the radius of the first through hole 51, and the difference between the radius of the circular arc and the radius of the first through hole 51 is 0.5-10 mm. The height from the bottom of the U-shaped oil drainage groove 6 to the top of the tile surface 2 made of the composite material is 0.1-0.2 mm, and the interference of lubricating oil in the U-shaped oil drainage groove 6 on temperature monitoring can be avoided.
On-line monitoring oil film temperature subassembly includes that oil film temperature sensor 3 and cover establish at the outside sensor radiation shield 4 of 3 probes 31 of oil film temperature sensor, and oil film temperature sensor 3 divide into the three, follows upwards to be in proper order down: a nut 34 at the bottom end, a threaded section 33 in the middle, and a probe 31 above. The inner diameter of the sensor heat insulation sleeve 4 is matched with the outer diameter of the probe 31 of the oil film temperature sensor 3, the end part of the probe 31 of the oil film temperature sensor 3 is flush with the end face of the sensor heat insulation sleeve 4, and the outer diameter of the sensor heat insulation sleeve 4 is matched with the inner diameter of the mounting hole 5. After the oil film temperature sensor 3 and the sensor heat insulation sleeve 4 special for the sensor are assembled, the oil film temperature sensor and the sensor heat insulation sleeve are fixed in the mounting hole 5 together. The diameter of the probe 31 of the oil film temperature sensor 3 in the embodiment is less than or equal to 3 mm. The end part of the probe 31 of the oil film temperature sensor 3 is lower than the top of the composite material tile surface 2, the distance between the end part of the probe 31 of the oil film temperature sensor 3 and the top of the composite material tile surface 2 is 1.5 mm-2 mm, and on the premise of avoiding the contact between the end part of the probe 31 of the oil film temperature sensor 3 and the mirror plate, the end part of the probe 31 of the oil film temperature sensor 3 is ensured to be positioned at the highest position of the pressure oil film temperature, so that the highest oil film temperature of the composite material thrust bearing is timely and accurately monitored, and the running safety of a.
The middle part of the oil film temperature sensor 3 is provided with the thread section 33, and the oil film temperature sensor 3 is uniformly coated with enough oxygen-resistant sealant on the thread section 33 before installation, so that the oil film temperature sensor is ensured to be completely filled in a tiny gap between the external thread of the thread section 33 and the internal thread of the thread hole 52, and the looseness of the sensor and the leakage of lubricating oil caused by long-time impact and vibration can be avoided. The thread section 33 of the oil film temperature sensor 3 adopts a sealing pipe thread with sealing capacity, connection tightness is guaranteed by means of deformation of thread teeth, and the oil film temperature sensor has a good sealing effect.
The flange end face 32 of the oil film temperature sensor 3 is tightly attached to the step in the mounting hole 5, so that the pressure relief phenomenon caused by the infiltration of lubricating oil can be prevented.
Example 2
On the basis of embodiment 1, the invention also provides a method for monitoring the oil film temperature of the composite material thrust bearing on line, which comprises the following steps:
s1, sleeving the sensor heat insulation sleeve 4 outside the probe 31 of the oil film temperature sensor 3;
s2, uniformly coating enough oxygen-resistant sealant on the threaded section 33 of the oil film temperature sensor 3 to ensure that the sealant is completely filled in a tiny gap between the external thread of the threaded section 33 and the internal thread of the threaded hole 52;
s3, before the anti-oxidation sealant is solidified, screwing the online oil film temperature monitoring assembly into the threaded hole 52 of the mounting hole 5, locking the threads, and solidifying the sealant into a tough solid to prevent the threads from moving so that the assembly is firmly fixed in the bearing; when the oil film temperature sensor is installed, the flange end face 32 of the oil film temperature sensor 3 is tightly attached to a step between the first through hole 51 and the threaded hole 52 in the installation hole 5, and lubricating oil is prevented from permeating;
s4, installing the composite material bearing and the online oil film temperature monitoring assembly in a unit, fixing a cable of the oil film temperature sensor 3 along the bottom of an oil tank of the unit by a fixing wire clamp, leading out from an outlet of the oil tank of the unit, entering a signal acquisition module, processing the signal by a photoelectric conversion signal, and transmitting the signal to a programmable controller for temperature storage and analysis;
and S5, starting the unit, operating at a certain rotating speed and under a certain load condition, measuring a sensor signal in real time by the oil film temperature sensor 3, and displaying the analyzed data in real time on the upper computer.
Example 3
The method comprises the following steps of utilizing a composite material thrust bearing and a composite material thrust bearing oil film temperature detection assembly to perform online monitoring of oil film temperature on a simulated hydroelectric generating set working condition test unit, wherein the process comprises the following steps:
s1, sleeving the sensor heat insulation sleeve 4 outside the probe 31 of the PT100 temperature sensor;
s2, uniformly coating enough oxygen-resistant sealant on the temperature sensor threaded section 33 to ensure that the sealant is completely filled in a tiny gap between the external thread of the threaded section 33 and the internal thread of the threaded hole 52;
s3, before the anti-oxidation sealant is solidified, screwing the on-line oil film temperature monitoring component into the bearing mounting hole 5, namely screwing the threaded section 33 of the oil film temperature sensor 3 into the threaded hole 52 of the mounting hole 5 through the nut 34 of the oil film temperature sensor 3, locking the threads, and solidifying the sealant into a tough solid to prevent the threads from moving so that the component is firmly fixed in the bearing; when the oil film temperature sensor is installed, the flange end face 32 of the oil film temperature sensor 3 is tightly attached to a step between the first through hole 51 and the threaded hole 52 in the installation hole 5, and lubricating oil is prevented from permeating; wherein the distance from the head of the oil film temperature sensor 3 to the top of the composite material tile surface 2 (namely the depth of the oil film temperature sensor 3) is 1.7mm, and the height from the bottom of the U-shaped oil drainage groove 6 to the top of the composite material tile surface 2 (namely the depth of the U-shaped oil drainage groove 6) is 0.2 mm;
s4, installing the composite material bearing and the online oil film temperature monitoring assembly in a unit, fixing a cable of the oil film temperature sensor 3 along the bottom of an oil tank of the unit by a fixing wire clamp, leading out from an outlet of the oil tank of the unit, entering a signal acquisition module, processing the signal by a photoelectric conversion signal, and transmitting the signal to a programmable controller for temperature storage and analysis;
and S5, operating the testing unit, wherein the rotating speed of the testing table is 600r/min, the bearing pressure is 4MPa, after the operation is stable, increasing the rotating speed to 700r/min, observing the oil film temperature and the tile body temperature of the tile, and recording temperature data (shown in table 1) after the operation of the acquisition system is stable to obtain a temperature monitoring curve (shown in figure 7).
As can be seen from the temperature monitoring curve chart of fig. 7, when the rotation speed suddenly increases, the temperature of the tile body slowly increases, and the change is not obvious in a short time; the oil film temperature can rise rapidly within 2 minutes, the temperature rise can reach 2 ℃, and the reaction is rapid, so that the problem of lagging alarm temperature of a unit can be solved by monitoring the oil film temperature on line. In addition, the temperature difference between the oil film temperature and the tile body temperature can reach about 25 ℃, and the high precision and sensitivity of the oil film temperature monitoring assembly are reflected.
TABLE 1 oil film temperature data table for orthogonal test with rotation speed of 600r/min and load of 4MPa
As can be seen from the data in table 1 above, the embodiment of the present invention achieves the following technical effects: the oil film temperature of the composite material thrust bearing is accurately and timely monitored, and the problem of temperature monitoring lag is solved, so that the tile burning accident is effectively prevented; simple structure and convenient installation. When the depth of the U-shaped oil drainage groove 6 and the depth of the sensor exceed the measuring size range, the measuring result can generate errors, namely the depth of the U-shaped oil drainage groove 6 exceeds 0.2mm, and when the depth of the oil film temperature sensor 3 exceeds 2mm, the measuring result can generate errors. The purpose of U type draining groove 6 is in order to get rid of impurity and pile up, avoids measuring inaccurately, and when its degree of depth exceeded 0.2mm, can cause the contact with cold oil, makes temperature measurement inaccurate, produces the error.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. The device for monitoring the oil film temperature of the composite material thrust bearing on line comprises the composite material thrust bearing and an on-line oil film temperature monitoring assembly, and is characterized in that the composite material thrust bearing mainly comprises a tile base body (1) and a composite material tile surface (2) arranged on the tile base body (1); the composite material thrust bearing is provided with a tapered stepped mounting hole (5) for mounting the oil film temperature online monitoring assembly, the mounting hole (5) penetrates through the tile base body (1) and the composite material tile surface (2), the axis of the mounting hole (5) is perpendicular to the composite material tile surface (2) and is arranged at the highest position of the oil film temperature of the composite material thrust bearing, and the highest position of the oil film temperature of the composite material thrust bearing is determined according to the calculation result of finite element analysis software;
a U-shaped oil drainage groove (6) is formed in the composite tile surface (2) in the horizontal direction, the U-shaped oil drainage groove (6) is communicated with the mounting hole (5) and accommodates an orifice at the top of the mounting hole (5) on the composite tile surface (2), an arc axis on one side of the U-shaped oil drainage groove (6) is overlapped with an axis of the mounting hole (5), and an opening on the other side of the U-shaped oil drainage groove (6) faces an oil outlet edge;
the online oil film temperature monitoring assembly comprises an oil film temperature sensor (3) and a sensor heat insulation sleeve (4) sleeved outside a probe (31) of the oil film temperature sensor (3), the inner diameter of the sensor heat insulation sleeve (4) is matched with the outer diameter of the probe (31) of the oil film temperature sensor (3), the end part of the probe (31) of the oil film temperature sensor (3) is flush with the end face of the sensor heat insulation sleeve (4), and the outer diameter of the sensor heat insulation sleeve (4) is matched with the inner diameter of the mounting hole (5);
a threaded section (33) is arranged in the middle of the oil film temperature sensor (3), and an oxygen-resistant sealant is coated on the threaded section (33);
and the flange end face (32) of the oil film temperature sensor (3) is tightly attached to the step in the mounting hole (5).
2. The device for online monitoring of oil film temperature of composite material thrust bearing according to claim 1, wherein diameter of probe (31) of oil film temperature sensor (3) is less than or equal to 3 mm.
3. The device for online monitoring of the oil film temperature of the composite material thrust bearing according to claim 1 or 2, wherein the end of the probe (31) of the oil film temperature sensor (3) is lower than the top of the composite material pad surface (2), and the distance between the end of the probe (31) of the oil film temperature sensor (3) and the top of the composite material pad surface (2) is 1.5 mm-2 mm.
4. The device for online monitoring of oil film temperature of composite material thrust bearing according to claim 3, characterized in that the threaded section (33) of the oil film temperature sensor (3) is a sealed pipe thread with sealing capability.
5. The device for online monitoring of oil film temperature of a composite material thrust bearing according to claim 1, wherein the mounting hole (5) with the tapered step shape is characterized in that the mounting hole (5) is provided with a tapered second through hole (53), a threaded hole (52) and a first through hole (51) which are communicated with each other, and the second through hole (53) is used for accommodating a bottom nut (34) on the oil film temperature sensor (3); the internal thread of the threaded hole (52) is matched and connected with the external thread of the threaded section (33), and the coated oxygen-resistant sealant is completely filled in a gap between the external thread of the threaded section (33) and the internal thread of the threaded hole (52); the first through hole (51) is in clearance fit with the outer diameter of the sensor heat insulation sleeve (4), wherein the diameter of the first through hole (51) is less than or equal to 4 mm.
6. The device for online monitoring of oil film temperature of composite material thrust bearing according to claim 1 or 5, characterized in that the radius size of the circular arc at one side of the U-shaped oil drainage groove (6) is larger than the radius size of the first through hole (51), and the difference between the radius of the circular arc and the radius of the first through hole (51) is 0.5 mm-10 mm.
7. The device for online monitoring of oil film temperature of composite material thrust bearing according to claim 6, wherein the height from the bottom of the U-shaped oil drainage groove (6) to the top of the composite material tile surface (2) is 0.1-0.2 mm.
8. A method for monitoring the temperature of an oil film of a composite material thrust bearing on line is characterized by comprising the following steps:
s1, sleeving the sensor heat insulation sleeve (4) outside the probe (31) of the oil film temperature sensor (3);
s2, uniformly coating sufficient oxygen-resistant sealant on the threaded section (33) of the oil film temperature sensor (3) to ensure that the sealant is completely filled in a gap between the external thread of the threaded section (33) in the oil film temperature sensor (3) and the internal thread of the threaded hole (52) in the mounting hole (5);
s3, before the anti-oxygen sealant is solidified, screwing the on-line oil film temperature monitoring assembly into the threaded hole (52) of the mounting hole (5), and ensuring that the flange end face (32) of the oil film temperature sensor (3) is tightly attached to a step between the first through hole (51) and the threaded hole (52) in the mounting hole (5);
s4, installing the composite material bearing and the online oil film temperature monitoring assembly in a unit, leading a cable of the oil film temperature sensor (3) out of an outlet of the unit oil tank after being fixed by a fixing wire clamp along the bottom of the unit oil tank, then leading the cable into a signal acquisition module, processing the signal by a photoelectric conversion signal, and transmitting the signal to a programmable controller for temperature storage and analysis;
and S5, starting the unit, operating under the conditions of a certain rotating speed and load, measuring a sensor signal in real time by the oil film temperature sensor (3), and displaying the analyzed data in real time by an upper computer.
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| CN111336909A (en) * | 2020-03-26 | 2020-06-26 | 大连三环复合材料技术开发股份有限公司 | Method for measuring oil film thickness of thrust bearing-babbit metal tile for water turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111336909A (en) * | 2020-03-26 | 2020-06-26 | 大连三环复合材料技术开发股份有限公司 | Method for measuring oil film thickness of thrust bearing-babbit metal tile for water turbine |
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