CN113848059B - Bearing thermal tester system device and method - Google Patents
Bearing thermal tester system device and method Download PDFInfo
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- CN113848059B CN113848059B CN202111128781.9A CN202111128781A CN113848059B CN 113848059 B CN113848059 B CN 113848059B CN 202111128781 A CN202111128781 A CN 202111128781A CN 113848059 B CN113848059 B CN 113848059B
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- 238000013016 damping Methods 0.000 claims abstract description 11
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- 239000007788 liquid Substances 0.000 description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
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- 239000002184 metal Substances 0.000 description 1
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
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- G—PHYSICS
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Abstract
A bearing thermal tester system device and method comprises a power device, a temperature and pressure measuring device, a sealing device and a tester main body; the tester main body comprises a tester cavity arranged on the damping platform, a tester shaft used for transmitting power is arranged in the tester cavity, an equivalent bearing is fixed on the tester shaft, resistance induction heating rings are arranged on the equivalent bearing, two tester cavity covers are arranged on two sides of the tester cavity, four fluid inlet pipelines and four fluid outlet pipelines are respectively arranged on the tester cavity covers, flow sensors are arranged on the fluid inlet pipelines and the fluid outlet pipelines, a pressure sensor and a temperature sensor are arranged at the inlet and outlet positions of the tester cavity, an inlet end pressure sensor and a temperature sensor are arranged on the equivalent bearing, an outlet end pressure sensor and a temperature sensor are arranged on the equivalent bearing, two bearings are respectively used for supporting two ends of the bearing tester shaft, and bearing end covers are arranged on two sides of the bearing tester shaft. The invention can analyze the temperature flow field influence factors of the bearing in the flow field.
Description
Technical Field
The invention belongs to the technical field of bearing thermal testers, and particularly relates to a bearing thermal tester system device and a method.
Background
Because the bearing rotating at high speed has the working condition characteristics of high thrust, high rotating speed and ultralow temperature, the bearing has the dangerous condition of blackening, scratches and even damage in the running process. The essential reason is that the bearing heating under high-speed rotation can not conduct heat in time, and heat diffusion is difficult to conduct. The existing testers are difficult to detect data due to the characteristic of the ultralow temperature working condition of the bearing. The working environment in which the bearing is located is extremely complex, and not only is the heat generated by friction of all parts of the bearing diffused, but also the heat generated by friction with fluid in the tester cavity, so that under the complex working condition, the research on heat exchange is more complex.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a bearing thermal tester system device and a method, which can analyze the temperature flow field influence factors of a bearing in a flow field and can provide test data support of the first hand for the design of an ultralow temperature test device, the planning of a sensor layout scheme, the detection process and the like.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a bearing thermal tester system device comprises a power device, a temperature and pressure measuring device, a sealing device 13, a tester main body 1-25, a sealing device and a sealing device, wherein the power device, the temperature and pressure measuring device and the sealing device are arranged on a damping platform with the same horizontal height;
the tester comprises a tester body 1-25, wherein the tester body comprises a tester cavity 15 arranged on a damping platform, a tester shaft 1 for transmitting power is arranged in the tester cavity 15, an equivalent bearing 10 fixed on the tester shaft 1, and resistance induction heating rings 9 arranged on the equivalent bearing 10, two tester cavity covers 5 are arranged on two sides of the tester cavity 15, four fluid inlet pipelines 4 and four fluid outlet pipelines 11 are respectively arranged on the tester cavity covers 5, flow sensors 14 are arranged on the fluid inlet pipelines 4 and the fluid outlet pipelines 11, pressure sensors 7 and temperature sensors 8 are arranged at inlet and outlet positions of the tester cavity 15, inlet end pressure sensors and temperature sensors 1-5, outlet end pressure sensors and temperature sensors 1-6 are arranged on the equivalent bearing 10, two ends of the bearing tester shaft 1 are respectively supported by two bearings 12, and bearing end covers 2 are arranged on two sides of the bearing tester shaft 1.
The inlet end pressure sensor and the temperature sensor 1-5, and the outlet end pressure sensor and the temperature sensor 1-6 are connected with a data processing device and finally connected to a computer terminal; a mechanical sealing device 13 is added at the joint of the tester shaft 1 and the tester cavity cover 5.
The power device comprises a wound-rotor type asynchronous motor 1-22, wherein the wound-rotor type asynchronous motor 1-22 is connected with an output shaft 1-23, and the output shaft 1-23 is connected with a tester shaft 1 through a coupler 1-24 to transmit power.
The sealing device 13 comprises a sealing element static ring 1-16, a sealing element gasket 1-17 connected with the sealing element static ring through interference fit, a spring lining 1-18 arranged on the sealing element gasket through interference fit, a spring lining 1-18 and an outer ring sealing element 1-19 are matched, the spring lining 1-18 and the outer ring sealing element 1-19 can move mutually, and a sealing ring movable spring 1-20 is arranged between a spring outer lining 1-21 and the spring lining 1-18.
The temperature and pressure measuring device comprises a clamping type flow sensor 1-1 and a clamping type flow sensor 1-2 which are arranged at an inlet pipeline, and a clamping type flow sensor 1-9 and a clamping type flow sensor 1-10 which are arranged at an outlet pipeline; the pressure sensor 1-3 is arranged in the position where the fluid just flows into the cavity for testing the inlet pressure, and the pressure sensor 1-8 is arranged in the cavity close to the outlet pipeline for detecting the outlet pressure; the temperature sensor 1-4 is arranged in the initial fluid inlet area, the cavity is perforated to extend the temperature sensor probe into the cavity, and the temperature sensor 1-6 is arranged at the outlet end of the simulated flow of the equivalent bearing.
A method of measuring a bearing thermal tester system device, comprising the steps of:
step 1: the bearing thermal tester comprises a tester main body 1-25, a power device 1-22, a temperature and pressure detection device and a data processing device;
step 2: an equivalent bearing 10 is introduced instead of a real bearing;
step 3: simulating a heating phenomenon in the actual working condition of the bearing by using the resistance heating ring 9;
step 4: respectively designing four experiments according to a control variable method, wherein the temperature, the pressure, the inlet quantity and the rotating speed are used as variables;
step 5: the temperature distribution and the pressure distribution of each position are measured by the temperature sensor 1-4, the temperature sensor 1-6, the temperature sensor 1-7, the pressure sensor 1-3 and the pressure sensor 1-8.
The step 1 specifically comprises the following steps:
1) The resistance induction heating ring 9 is arranged at the middle position of the equivalent bearing 10, and the equivalent bearing 10 provided with the resistance induction heating ring 9 is arranged on the tester shaft;
2) The assembly is installed into the tester cavity 15, the tester cavity is installed on the damping base 16, then the fluid pipeline is connected to the tester cavity cover 5, and then the hydraulic pump is connected;
3) The wound-rotor asynchronous motor 1-22 is arranged on a shock absorption base which is equal to the height of the tester cavity 15, and then the output shaft 1-23 and the tester shaft 1 are connected through a coupler 1-24;
4) A flow sensor 14 is arranged on the inlet pipeline 4 of the cavity cover 5 of the tester;
5) A pressure sensor 7 and a temperature sensor 8 are arranged in the tester cavity 15 at positions close to the inlet and the outlet;
6) And connecting each sensor with an information acquisition system, and finally accessing the information acquisition system into a computer terminal.
The invention has the beneficial effects that:
the invention provides flow field detection equipment of a bearing thermal tester, which comprises bearing working condition simulation equipment, an equivalent bearing, an equivalent heat source and flow field detection equipment. Wherein the equivalent bearing and the equivalent heat source have the following advantages:
1. compared with the prior real test equipment and environment, the equipment introduces equivalent principles and simulation analysis to complete the replacement of the bearings in the normal-temperature tester, simultaneously designs and replaces the scheme of the heat flow field of the tester by utilizing the equivalent principles and the simulation analysis, and the analysis result of the simulation shows that the design meets the requirements, verifies the correctness of the structural design and finally completes the design of the equivalent bearings and the equivalent heat source.
2. The introduction of the equivalent bearing solves the problem that the bearing under the existing test condition can not be operated under the ultra-high speed and ultra-low temperature environment. The structure is also compatible with the installation position of the heating device, and different bearing heat source arrangement and detection modes can be flexibly arranged.
3. The equivalent bearing structure is simple to process and low in cost.
The bearing working condition simulation device is used for simulating the flow field and the pressure condition of the bearing under the real working condition by introducing fluid through the inlet pipeline, and the flow rate and the number of inlet and outlet of the introduced fluid can be adjusted at any time to adjust the pressure of the flow field. Meanwhile, the heating working condition of the bearing is simulated by a direct heating mode of a thermal resistance wire arranged on the equivalent bearing, and the heating effect of the simulated bearing can be achieved based on the heating mode.
The flow sensor in the flow field detection equipment is arranged at a preselected measuring point, can be used for detecting the inlet and outlet flow difference of the tester at the same moment, and transmits detection data to a computer terminal for processing, so that the approximate stress condition of the inner structure of the bearing tester at a certain moment can be analyzed; the pressure sensor is arranged at a preselected measuring point, so that the pressure received by a certain point at a certain moment can be accurately measured; the temperature sensor is arranged at a preselected measuring point, and can respectively measure the initial temperature of the entering fluid liquid water, the temperature rise of the exiting fluid liquid water after passing through the bearing simulation blade and the heat dissipation condition of the fluid.
The bearing thermal tester can simulate various working conditions of a high-speed bearing flow field under the working state of the bearing, test the flow field where the bearing is positioned and the bearing under different conditions, measure the temperature distribution and pressure of the flow field and components, simulate and compare and verify the flow field in the tester by FLUENT, simulate the distribution and temperature distribution method of the pressure, optimize and modify the boundary condition of the flow field, simulate the heat transfer characteristic in the flow field in the tester, and establish a reasonable heat transfer mathematical model according to the temperature distribution of the flow field. The feasibility verification is carried out through the construction of a tester and experimental research results of simulation, the flow field in the bearing tester is optimized, appropriate boundary conditions are provided, heat transfer analysis is carried out on the bearing in the flow field, the influence of different boundary conditions on the flow field is analyzed, a pressure and temperature detection method and a flow field optimization scheme are provided, a new structure improvement scheme is provided, and simulation analysis is continuously carried out on a new structure, so that the expected effect is achieved. This provides a data reference for the subsequent optimisation of the high-speed bearing and its application carrier, and is of great significance.
According to the bearing thermal measurement method provided by the invention, firstly, a tester main body and a motor of a power input device are arranged on a damping platform, fluid liquid water is communicated through an inlet and outlet pipeline, flow, pressure and temperature sensors of appointed points are arranged, and then the sensors are connected into a data processing device and a computer terminal. And then an equivalent bearing device is introduced to simulate the flow field condition of a bearing under the real working condition, and a thermal resistance wire is arranged on the equivalent bearing through structural design to simulate the heat generated by friction and the heat generated by high-speed rotation of the bearing when fluid passes through the equivalent bearing in the real working environment. Other factors are kept unchanged by a controlled variable method, the temperatures of the heat sources are respectively set to be 25 ℃,50 ℃,75 ℃ and 100 ℃, and the temperature field change of the tester is observed; setting inlet pressure to be 1Mpa,0.5Mpa,50Kpa and 5Kpa respectively, and observing the change of the pressure field of the tester; setting the number of inlets to be 1,2,3 and 4 respectively, and observing the change of the pressure field of the tester; the motor rotating speeds are respectively 50r/min, 100r/min, 250r/min and 500r/min, four testing schemes of the change of the pressure field of the tester are observed, finally, simulation under corresponding test working conditions is carried out in FLUENT, influence factors of the flow field in the tester are obtained through simulation data analysis, further, a solution can be provided, the flow field is optimized, effective test data correction reference is provided for ultralow temperature bearing simulation, accuracy of simulation analysis is guaranteed, and the method has important significance for research of a bearing thermal tester.
Furthermore, the selection of the measuring points has important significance for the accuracy of the measuring result, when the pressure and the temperature distribution of the tester are measured, as all the points of the component cannot be exhausted and tested, certain points on the component are required to be selected as key measuring points, so that the selection of the measuring points of the key points is reasonable or not and directly related to the accuracy of the measuring result, and the selection of the key points greatly simplifies the workload of the test.
Furthermore, the equivalent bearing adopted by the invention meets the structure of low rotation speed and equivalent flow field, and meanwhile, the structure is compatible with the installation position of the heating device. Based on the requirement, the cross-sectional area of the key test structure is equal to the maximum cross-sectional area of the original bearing, the aperture area of the designed key test structure is equal to the gap area of the original bearing, the passing flow can be ensured to be approximately the same, the same flow field flow velocity is obtained, and the designed key test structure can be proved to be equivalent to the original bearing.
Furthermore, the invention adopts the simulated heat source to simulate the ball bearing heating under the real working environment, and uses the resistance wire to heat even molten metal or nonmetal, and has extremely high efficiency, and meanwhile, the working temperature can reach 2000 ℃, so the invention can be used for low-temperature heating and high-temperature heating. The heating wire heating has the characteristics of controllability and rapid temperature rise, and the resistance heating device has the advantages of simple structure, large temperature adjustable range, convenience in maintenance and the like. And the heat source is a controllable heat source, and the heating value can be changed through external regulation.
Description of the drawings:
FIG. 1 is a schematic illustration of a body of a thermal bearing tester.
FIG. 2 is a layout of a sensor on a bearing tester cavity.
Figure 3 is a partial construction diagram of the power system.
Figure 4 is an overall construction diagram of the tester.
FIG. 5 is a schematic block diagram of a tester system design.
Fig. 6 is a theoretical model of a key test structure.
Fig. 7 is a radial cross-sectional view of a finite element flow field trace plot under different conditions.
FIG. 8 is a radial cross-sectional view of a finite element under different operating conditions.
FIG. 9 is a plot of flow field resultant velocity versus spot for each position measurement point near the axis of rotation.
Fig. 10 is a diagram of tester cavity position location.
Fig. 11 is a temperature field cloud at different heat source temperatures.
FIG. 12 is a graph of temperature field comparisons at different inlet pressures.
Fig. 13 is a pressure field cloud for different inlet numbers.
Fig. 14 is a cloud of pressure fields at different motor speeds.
Fig. 15 is a tester flow field trace plot.
Detailed Description
The present invention will be described in further detail with reference to examples.
The invention discloses a device for testing an inner cavity flow field of a bearing thermal tester for simulating real working conditions, which comprises a power device for providing rotating speed for a bearing, a set of bearing environment equipment for simulating the real flow field, an equivalent mechanism for replacing pressure and surrounding flow field of the bearing under the real working conditions, and a set of complete temperature and pressure detection equipment. The power device can provide proper power according to the pressure applied to the real working rotating speed of the bearing; the equivalent mechanism and the equivalent flow field of the bearing can enable the equivalent structure to generate the same flow field with the bearing in the flow field, and the replacement of the part of the bearing is completed through simulation software. The problems of difficulty in simulation and difficulty in realization caused by the fact that the flow field is rotated, the flow field is heated and the real structure of the bearing is realized under the real working condition are solved, the influence of the equivalent replaced component in the flow field is similar to the influence of the bearing in the flow field, and the replacement of the bearing is completed through the equivalent of the flow field factors; in order to measure the temperature and pressure distribution of each part, a set of complete tester testing system is designed, and the testing system is mainly used for detecting the change of a flow field in a tester cavity, and based on the change, an optimal detection scheme can be designed, so that the reliability and stability of test data can be ensured. The bearing tester testing system mainly comprises a main body mechanism, a control system, a computer data acquisition system and the like. The main body mechanism consists of various systems, such as a motor and a transmission system of a coupling, such as a heating system where a heat source is located, such as a sealing system with a sealing function. The control system mainly controls the command to enable the relay and the air switch to act, so that the safe operation of the whole control system is ensured. The main hardware of the computer data acquisition system comprises various sensors, data acquisition instruments and the like. The data acquisition instrument is used for acquiring temperature and pressure in the flow field, and the sensor arranged on the cavity of the tester is used for acquiring data to perfect the testing system. More complex flow field conditions are measured using as few test sensors as possible.
The selection standard of the measuring points of the bearing thermal tester component is as follows:
a, the inlet and outlet positions of the bearing tester are needed to be known, a flow sensor is needed to be arranged at the inlet position of the bearing tester to ensure that the inlet condition of the bearing tester meets the required set value, firstly, an accurate and quick feedback prompt tester inlet condition is needed to meet the requirement of no need of changing when the inlet condition of the bearing tester is regulated, the inlet temperature condition can be well determined by arranging a temperature sensor at the inlet, the heating condition inside the bearing tester is conveniently checked, and the heating efficiency inside the bearing tester can be accurately calculated by comparing the temperature measured by the temperature sensor at the outlet with the inlet flow temperature measured by the inlet;
b, the position of a key test structure of the bearing tester, the data on two sides of the key test structure of the bearing tester are critical because the rotation of the key test structure of the bearing tester causes the change of the flow field in the bearing tester, so that the sensors are required to be arranged on two sides of the key test structure, and the pressure on two sides of the blade is greatly changed even under the turbulent condition and cavitation phenomenon because of the rotation of the key test structure.
The equivalent bearing 10 used:
in the original project, the medium passes through the gap between the bearing ball and the retainer, the maximum value exists in the cross section area of the cross section of the medium passing through the shaft, the cross section area is related to the volume flow, and the same volume flow can be obtained by making the cross section area of the medium passing through the equivalent rotating part have the same size as the bearing;
volume flow rate: flow in volume/time or volume/time. Such as: m is m 3 And/h, l/h, wherein the volume flow formula is:
Q＝vA
wherein:
q-volume flow m 3 /h；
v-average flow rate m/s;
a-pipeline section area m 2 。
Mass flow rate: flow in mass and time. Such as: kg/h, kg/s, wherein the mass flow formula is:
M＝ρQ
wherein:
m-mass flow kg/h;
ρ -Medium Density kg/m 3 ；
Q-volume flow m 3 /h。
M＝ρvA
Wherein:
ρ -Medium Density kg/m 3 ；
v-average flow rate m/s;
a-pipeline section area m 2 ；
The diameter of the outer ring of the original bearing is 215mm, the diameter of the inner ring is 150mm, the diameter of the rotating ball is 31.2mm, and the thickness of the retainer is 40mm, so that the cross-sectional area of the key test structure is equal to the maximum cross-sectional area of the original bearing, the aperture area of the designed key test structure is ensured to be equal to the gap area of the original bearing, the passing flow rate can be ensured to be approximately the same, the same flow field flow velocity is obtained, and the designed key test structure can be proved to be equivalent to the original bearing;
the designed key test structure theoretical model 2 has an outer circle diameter 215mm,12 rectangular pores with a length of 25mm and a width of 21mm and an overall thickness of 40mm, as shown in fig. 6.
Selecting 5 measuring points, performing simulation verification, and processing results through Tecplot post-processing software, wherein the results are shown in fig. 7 and 8;
TABLE 1 flow field speed contrast for each position measurement point near the rotation axis
By comparing and analyzing the finite element axial sectional diagrams of the two schemes in different working conditions, the flow medium is basically consistent in flow field transmission effect generated by the original bearing and the key test structure. By analyzing the flow field closing speeds at various positions near the rotating shaft in table 1 and fig. 9, the flow speed is close, the speed field generated by the bearing and the equivalent component is similar, and the dotted line graph basically coincides, so that the equivalent can be proved, and the ideal closing speed flow field can be obtained. The equivalent bearing component can be utilized to replace the bearing in the cavity of the tester through an equivalent design method, so that the effect of researching the flow field is achieved.
The simulated heat source heating formula used in the step 3 is as follows:
wherein:
P total -total power loss W;
P ynj -the relative sliding power loss W between the ball and the raceway;
P xnj -friction power loss W caused by the ball gyro motion along the elliptical long axis X direction;
P snj -ball spin friction power loss W;
P bcj friction power loss W between ball and pocket;
P dragj ball stirring oil friction power loss W;
P cage -the power loss W of the cage vortex oil stirring;
P cl -frictional power loss W between the cage and the guide ferrule;
d 1 and d 2 -smaller and larger values m of the diameter of the cage and ferrule guiding surfaces.
Referring to fig. 1 to 5, the power device, the set of bearing simulation real flow field environment equipment, the equivalent bearing 10 used for replacing the pressure applied to the bearing under the real working condition and the surrounding flow field, and the set of complete temperature and pressure detection equipment are provided by the invention.
The power device comprises a wound-rotor type asynchronous motor 1-22 and an output shaft 1-23 connected with the asynchronous motor 1-22, wherein the output shaft 1-23 is connected with a tester shaft 1 through a coupler 1-24 to transmit power.
The device for simulating the real flow field environment comprises a tester main body 1-25, wherein the tester main body 1-25 comprises a tester cavity 15, a fluid inlet pipeline 4 and a fluid outlet pipeline 5 are respectively arranged on tester cavity covers 5 arranged at two ends of the tester cavity 15, a flow sensor 14 is respectively arranged on the inlet pipeline 4 and the outlet pipeline 5 and used for detecting the flow of the fluid in and out, the core part in the tester cavity 15 is a tester shaft 1 and an equivalent bearing 10 arranged on the tester shaft, the equivalent bearing 10 is designed according to the pressure generated in the working process of the real bearing through simulation calculation, the real flow field condition can be simulated and generated, in addition, an electric resistance heating ring 9 is arranged in the middle of the equivalent bearing 10, the electric resistance heating ring 9 can be changed to adjust the heating quantity according to different rotating speeds and fluid flows, the purpose is also to simulate the real bearing work and the heat generated by friction with fluid, meanwhile, the positions of the temperature sensor and the pressure sensor which are arranged on the equivalent bearing are 1-5 and 1-6 through simulation, meanwhile, the pressure sensor 7 and the temperature sensor 8 are arranged on the fluid inflow and outflow part, in order to prevent the problem that the test result is inaccurate due to leakage of the fluid in a high-pressure environment, two sealing devices 13 are additionally arranged on the matching part of the tester shaft 1 and the tester cavity end cover 5, and the sealing devices 13 comprise a sealing element static ring 1-16, a sealing element gasket 1-17, a spring lining 1-18, an outer ring sealing element 1-19, a sealing ring movable spring 1-20 and a spring outer lining 1-21.
The pressure and temperature detection device comprises flow sensors 1-1, 1-2, 1-9 and 1-10, pressure sensors 1-3 and 1-8 and temperature sensors 1-4 and 1-6.
The selection of the measuring points requires that as few test sensors as possible measure more complex flow field conditions, and simultaneously ensures that the test results of the sensors must be accurate. Because the cavity of the tester is of a cylindrical structure, when the sensor is arranged, the temperature sensor can be installed on the top of the cylindrical wall of the tester, and the end cover of the cavity of the tester is made of stainless steel materials, so that the clamping type flow sensor can be installed on the pipeline at the inlet end, and based on the installation mode, the pressure sensor can be installed at the front end and the rear end of the cavity.
The selection principle of the measuring point comprises the following aspects:
1 bearing tester inlet and outlet positions. It is to be understood that the flow rate of the inlet of the bearing tester must be provided with a flow sensor at the inlet position of the bearing tester to ensure that the inlet condition of the bearing tester meets the required set value. First, an accurate and fast feedback is necessary to indicate the tester inlet conditions when adjusting the inlet conditions of the bearing tester to meet the need for no further modification. The inlet is provided with the temperature sensor which can well determine the temperature condition of the inlet, so that the internal heating condition of the bearing tester can be conveniently checked, and the heating efficiency of the bearing tester can be accurately calculated by comparing the temperature measured by the temperature sensor at the outlet with the temperature of the inlet flow measured by the inlet.
2 key test structure positions of the bearing tester. Since rotation of the critical test structure of the bearing tester causes changes in the internal flow field of the bearing tester, data on both sides of the critical test structure of the bearing is critical, so that sensors need to be arranged on both sides of the critical test structure. The rotation of the key test structure causes the pressure on the two sides of the blade to change greatly, and even turbulent flow and cavitation are generated.
The invention provides a bearing thermal test method, which specifically comprises the following steps:
1. and (3) mounting a bearing thermal test and detection equipment:
1.1, a resistance induction heating ring 9 is arranged at the middle position of an equivalent bearing 10, and the equivalent bearing 10 provided with the resistance induction heating ring 9 is arranged on a tester shaft;
1.2 installing the above assembly into the tester cavity 15, installing the tester cavity to the shock mount 16, then connecting the fluid pipe to the tester cavity cover 5, and then connecting to the hydraulic pump;
1.3, the wound-rotor asynchronous motor 1-22 is arranged on a damping base with the same height as the cavity 15 of the tester, and then the output shaft 1-23 and the tester shaft 1 are connected through a coupler 1-24;
1.4 mounting a flow sensor 14 on the inlet pipe 4 of the tester cavity cover 5;
1.5 installing a pressure sensor 7 and a temperature sensor 8 at a position close to an inlet and an outlet in the cavity 15 of the tester;
and 1.6, connecting each sensor with an information acquisition system, and finally accessing the computer terminal.
2. Experiments were performed
Based on the existing system, the internal flow field of the tester is tested, and the flow field in the tester is measured by the testing system through controlling the variables of the tester and utilizing the numerical values of the changed variables. Wherein the flow field of the tester is tested mainly by data measurement of three aspects, namely pressure aspect, speed aspect and temperature aspect.
1 to ensure that other factors are unchanged, gradually changing the temperature of the heat source, and further researching the temperature field near the key test part based on the change of the temperature of the heat source. And thus analyze the effect of heat source temperature on the flow field near the critical test component. In the heat source change scheme, the heat source temperature is 25 ℃,50 ℃,75 ℃ and 100 ℃ are compared, and the change of the temperature field of the tester is observed.
2 ensuring that other factors are unchanged, only changing the inlet pressure, and respectively carrying out comparative analysis on the flow field in the tester when the inlet pressure is 1mpa,0.5mpa,50kpa and 5kpa by observing the pressure and the temperature of the flow field in the tester when the inlet pressure is changed, so as to observe the change of the pressure field of the tester.
And 3, ensuring that other factors are unchanged, only changing the quantity of inlets, carrying out contrast analysis on the pressure field of the tester, intuitively reflecting the quantity of inlets through contrast, namely, the influence of flow on the flow field in the tester, carrying out contrast analysis on the pressure field of the flow field when the quantity of inlets and outlets is respectively 1,2,3 and 4, and observing the change of the pressure field of the tester.
And 4, ensuring that other factors are unchanged, only changing the rotating speed of the motor, carrying out contrast analysis on the pressure field of the tester, intuitively reflecting the quantity of inlets through contrast, namely the influence of flow on the flow field in the tester, and carrying out contrast analysis on the pressure field of the flow field when the rotating speed of the motor is respectively 50r/min, 100r/min, 250r/min and 500r/min, so as to observe the change of the pressure field of the tester.
3. Simulation test
The test scheme is verified by simulating the flow field in the tester, and the flow field of the tester is subjected to comparison research by using a single variable method, because specific flow field values in the cavity of the tester are to be researched, and 5 simulated measuring points in the cavity of the tester are respectively selected, as shown in fig. 10.
The simulation analysis data are perfected through the positions corresponding to the 5 measuring points, the factors really influencing the flow field in the cavity of the tester can be analyzed by comparing the data of the 5 measuring points, and the flow field in the tester is analyzed by using a comparison method to analyze the pressure field, the speed field and the temperature field of the tester.
The degree of influencing the flow field is judged by comparing the numerical values of the measuring points, so that the experimental problem which can occur in the actual test is avoided, and the test direction is provided for the later test.
3.1 experiment 1 simulation analysis
It can be seen from fig. 11 that the temperature field at the four heat source temperatures has substantially the same trend in temperature, substantially the same temperature in the inlet channel region, and a certain degree of temperature rise as the fluid passes through the critical test components. After passing through the critical test components, the temperature is reduced by a small extent because the outlet temperature is at normal temperature. At a limit temperature of 100 c, the maximum temperature reaches 320K, and then slowly decreases to about 300K at the outlet.
It can be seen that in the process of gradually increasing the temperature of the heat source, the temperature of the cavity of the tester is gradually increased, and the heat dissipation condition of the flow field is directly influenced by the temperature of the heat source.
TABLE 2 Heat source temperature Change Meter
3.2 experiment 2 simulation analysis
The change of the pressure field of the tester can be obviously seen through analysis, and the measurement point data are shown in the table. It can be seen from the figure that the pressure trend of the pressure field at the four inlet pressures is also approximately the same, the pressure is substantially the lowest of the measured pressures in the inlet channel region, and the pressure rises substantially as the fluid passes the critical test components, and the pressure builds up near the critical components. After passing the critical test components, the pressure gradually drops by a small amount. In the simulation analysis, in the case where the inlet pressure was 50Kpa, the pressure distribution inside the tester and the value of the case where the inlet pressure was 5Kpa were substantially identical, and based on this, the temperature fields of both were subjected to a comparison such as shown in fig. 12.
It can be seen that in the process of gradually decreasing the inlet pressure, the temperature of the cavity of the tester is gradually increased, and the pressure is gradually decreased, so that the influence of positive correlation between the size of the inlet pressure and the heat dissipation of the flow field temperature of the tester is known, and the measurement point data are shown in table 3.
TABLE 3 Inlet pressure Change Meter
Table 4 inlet pressure change gauge
3.3 experiment 3 simulation analysis
TABLE 5 Inlet quantity Change Table
The change in the tester pressure field is evident from the analysis of fig. 13, with the station data shown in table 5.
Meanwhile, the pressure change trend of the pressure field under the four inlet numbers is approximately the same as that of the pressure field under the four inlet numbers, and the fact that the pressure field changes irregularly when the inlet number of the tester is increased is shown, the irregularity is caused by the factors influencing the pressure such as vortex in the flow field, and when the fluid passes through the key test part, the pressure rises greatly, so that the pressure is accumulated near the key part. It can be seen that when the number of inlets is 4, the highest point pressure of the tester pressure field reaches 26087pa, which means that the pressure of the flow field in the tester increases when the number of inlets increases.
3.4 experiment 4 simulation analysis
Table 6 motor speed change table
The tester pressure field was analyzed by the change in rotational speed, as shown in fig. 14, and based on this comparative analysis, the pressure at each point in the tester was recorded, as shown in table 6.
It can be seen from table 6 that when the rotation speed of the motor becomes high, the pressure of the flow field in the tester has obvious change, when the rotation speed of the motor of the tester is 1000r/min, the highest measuring point pressure of the flow field in the tester can reach 27228pa, and the pressure flow field of the tester has negative pressure, because vortex appears in the flow field of the pressure field of the tester, and the trace diagram is studied, as shown in fig. 15.
It can be seen that when the rotation speed of the motor increases, the vortex of the flow field in the tester increases, and it is known that the increase of the rotation speed cannot reduce the pressure of the tester, and the situation that the pressure is counterproductive may be achieved.
----------------------------------------------------
Claims (7)
1. The bearing thermal tester system device is characterized by comprising a power device, a temperature and pressure measuring device and a sealing device (13), wherein the power device, the temperature and pressure measuring device and the sealing device are arranged on a damping platform with the same horizontal height, and tester bodies (1-25) are arranged on a damping base (16) and are used for simulating a flow field;
the tester comprises a tester body (1-25), wherein the tester body (1-25) comprises a tester cavity (15) arranged on a damping platform, a tester shaft (1) used for transmitting power is arranged in the tester cavity (15), an equivalent bearing (10) is fixed on the tester shaft (1), and a resistance induction heating ring (9) arranged on the equivalent bearing (10), two tester cavity covers (5) are arranged on two sides of the tester cavity (15), four fluid inlet pipelines (4) and outlet pipelines (11) are respectively arranged on the tester cavity covers (5), flow sensors (14) are arranged on the fluid inlet pipelines (4) and the outlet pipelines (11), a pressure sensor (7) and a temperature sensor (8) are arranged at the inlet and outlet positions of the tester cavity (15), an inlet end pressure sensor and a temperature sensor (1-5) are arranged on the equivalent bearing (10), an outlet end pressure sensor and a temperature sensor (1-6), two ends of the bearing tester shaft (1) are respectively supported by two bearings (12), and end covers (2) are arranged on two sides of the bearing tester shaft.
2. A bearing thermal tester system according to claim 1, wherein the inlet and temperature sensors (1-5), outlet and temperature sensors (1-6) are all connected to data processing means and ultimately to computer terminals; a mechanical sealing device (13) is arranged at the joint of the tester shaft (1) and the tester cavity cover (5).
3. A bearing thermal tester system according to claim 1, characterized in that the power means comprises a wound-rotor asynchronous motor (1-22), the wound-rotor asynchronous motor (1-22) being connected to an output shaft (1-23), the output shaft (1-23) being connected to the tester shaft (1) via a coupling (1-24) for transmitting power.
4. A bearing thermal tester system according to claim 1, characterized in that the sealing means (13) comprises a seal stationary ring (1-16), a seal gasket (1-17) connected to the seal stationary ring by an interference fit, a spring liner (1-18) mounted on the seal gasket by an interference fit, the spring liner (1-18) and the outer ring seal (1-19) forming a fit, movable with respect to each other, a seal ring movable spring (1-20) being mounted between the spring outer liner (1-21) and the spring liner (1-18).
5. A bearing thermal tester system according to claim 1, wherein the temperature and pressure measuring means comprises a clamp-on flow sensor (1-1) mounted at the inlet duct, and a clamp-on flow sensor (1-2), a clamp-on flow sensor (1-9) and a clamp-on flow sensor (1-10) mounted at the outlet duct; the pressure sensor (1-3) is arranged in the cavity near the outlet pipeline and used for detecting the outlet pressure; the temperature sensor (1-4) is arranged in the initial fluid inlet area, the cavity is perforated to extend the temperature sensor probe into the cavity, and the temperature sensor (1-6) is arranged at the outlet end of the simulated flow of the equivalent bearing.
6. A method of measuring a bearing thermal tester system device according to any one of claims 1 to 5, comprising the steps of:
step 1: the bearing thermal tester comprises a tester main body (1-25), a power device (1-22), a temperature and pressure detection device and a data processing device;
step 2: introducing an equivalent bearing (10) to replace the real bearing;
step 3: simulating a heating phenomenon in the actual working condition of the bearing by using a resistance heating ring (9);
step 4: respectively designing four experiments according to a control variable method, wherein the temperature, the pressure, the inlet quantity and the rotating speed are used as variables;
step 5: the temperature distribution and the pressure distribution of each position are measured by the temperature sensor (1-4), the temperature sensor (1-6), the temperature sensor (1-7) and the pressure sensor (1-3) and the pressure sensor (1-8).
7. A method of measuring a bearing thermal tester system according to claim 6, wherein said step 1 comprises the steps of:
1) The resistance induction heating ring (9) is arranged in the middle of the equivalent bearing (10), and the equivalent bearing (10) provided with the resistance induction heating ring (9) is arranged on the tester shaft;
2) Installing the assembly into a tester cavity (15), installing the tester cavity onto a damping base (16), connecting a fluid pipeline to a tester cavity cover (5), and connecting the fluid pipeline to a hydraulic pump;
3) The wound-rotor asynchronous motor (1-22) is arranged on a damping base which is as high as a tester cavity (15), and then the output shaft (1-23) and the tester shaft (1) are connected through a coupler (1-24);
4) A flow sensor (14) is arranged on an inlet pipeline (4) of a cavity cover (5) of the tester;
5) A pressure sensor (7) and a temperature sensor (8) are arranged at the position, close to the inlet and the outlet, inside the cavity (15) of the tester;
6) And connecting each sensor with an information acquisition system, and finally accessing the information acquisition system into a computer terminal.
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