CN112763208B - Method for testing lubricating performance of screw rod and star wheel meshing - Google Patents
Method for testing lubricating performance of screw rod and star wheel meshing Download PDFInfo
- Publication number
- CN112763208B CN112763208B CN202110030635.6A CN202110030635A CN112763208B CN 112763208 B CN112763208 B CN 112763208B CN 202110030635 A CN202110030635 A CN 202110030635A CN 112763208 B CN112763208 B CN 112763208B
- Authority
- CN
- China
- Prior art keywords
- star wheel
- liquid
- screw
- gas
- testing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/021—Gearings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/025—Test-benches with rotational drive means and loading means; Load or drive simulation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a method for testing the lubricating performance of a screw rod meshed with a star wheel, which injects lubricating fluid into a testing device for testing and comprises the following steps: each geometric form characteristic point S of the tooth surface of the actual star wheel1(x1,y1,z1) Converted into a test star wheel tooth surface geometric form characteristic point S2(x2,y2,z2) And the meshing clearance geometrical shapes of the star wheel and the screw rod before and after conversion are the same; according to the geometrical form characteristic point S of the tooth surface of the test star wheel2(x2,y2,z2) Processing to obtain a star wheel; and mounting the obtained star wheel on a testing device for testing the lubricating performance. The lubricating state of the single-screw compressor/expander meshing pair with different lubricating media, different compression working media and different molded lines can be tested.
Description
Technical Field
The invention belongs to the technical field of lubricating property testing methods, and relates to a method for testing the lubricating property of meshing of a screw and a star wheel.
Background
For single screw compressors and single screw expanders, the core components are a screw and two star wheels that engage with the screw (one screw and one star wheel are commonly referred to as a pair of meshing pairs), as shown in fig. 1 and 2. In order to ensure the service life of the screw, when the star wheel is selected, the abrasion resistance of the material is often lower than that of the screw rotor, so that the star wheel is relatively easy to abrade. In order to improve the wear resistance of the star wheel teeth, researchers develop various meshing pair molded lines such as a single-linear molded line, a single-linear secondary enveloping molded line, a single-cylinder (circular truncated cone) secondary enveloping molded line, a multi-linear molded line, a multi-cylinder non-equal-length enveloping molded line and the like in succession. However, the screw grooves in the single screw compressor are spiral groove structures, and a plurality of screw grooves (4-8) are usually arranged on one screw, the thickness of the star wheel teeth in the actual compressor is small (6-10 mm), and no space is arranged on the wall surfaces of the screw grooves and the star wheel teeth to install a pressure measuring device capable of measuring the pressure of the lubricating fluid in the meshing gap. Therefore, the prior art can not test the meshing lubricating performance of the screw and the star wheel.
Disclosure of Invention
The invention aims to provide a method for testing the meshing lubricating performance of a screw and a star wheel, and solves the problem that the meshing lubricating performance of the screw and the star wheel cannot be tested in the prior art.
The technical scheme adopted by the invention is that a method for testing the lubricating performance of the meshing of the screw and the star wheel injects a lubricating fluid into a testing device for testing, and comprises the following steps:
and 3, mounting the star wheel obtained in the step 2 on a testing device for testing the lubricating performance, wherein in the testing process, the Reynolds number of the lubricating fluid in the meshing gap between the star wheel and the screw is the same as the Reynolds number of the lubricating fluid in the actual meshing gap between the star wheel and the screw, and simultaneously, the lubricating fluid with the same volume and gas content as the gas in the actual meshing gap between the star wheel and the screw is obtained by adjusting the liquid flow and the gas flow.
The invention is also characterized in that:
in the above formula, the first and second carbon atoms are,
as a coordinate system S1And a coordinate system S2The x-axis angle between them, when transforming the geometry of the front side of the star wheel teeth:
when converting the geometry of the rear side of the star wheel teeth:
front side screw groove deflection angle alpha of star wheel toothfThe expression of (a) is as follows:
in the above formula, n1Is the number of screw heads, n2Is the number of teeth of the star wheel, rf1The distance r from the meshing point at the front side of the star wheel teeth to the rotating axis of the screw rodf2The distance from the meshing point at the front side of the star wheel tooth to the star wheel rotating axis is obtained;
rear side screw groove deflection angle alpha of star wheel toothbThe expression of (a) is as follows:
in the above formula, rb1The distance r from the meshing point at the rear side of the star wheel teeth to the rotation axis of the screw rodb2The distance from the meshing point at the rear side of the star wheel tooth to the rotation axis of the star wheel.
The testing device comprises a motor, the motor is connected with a rotor shaft for fixing a screw rod through a coupler, a first sealing cover body and a second sealing cover body are sleeved on the rotor shaft, the screw rod is positioned between the first sealing cover body and the second sealing cover body, a sealing shell is sleeved outside the screw rod, two ends of the sealing shell are respectively connected with the first sealing cover body and the second sealing cover body, a sealing plate is arranged on the inner wall of the sealing shell, and the sealing plate extends into a screw groove of the screw rod to separate the screw rod; the sealing shell is provided with a mounting hole, and the screw rod is provided with a pressure sensor; the star wheel passes through star wheel shaft swing joint on the star wheel support, cup joints the locking mechanism who is used for locking the star wheel on the star wheel shaft, and star wheel shaft top still is provided with angle displacement sensor, and the star wheel tooth stretches into the mounting hole and meshes with the screw rod, is provided with the feed liquor hole on the sealed shell between star wheel upper surface and the closing plate, is provided with back the liquid hole between star wheel lower surface and the closing plate.
The liquid supply and return system comprises a liquid supply tank, a low-pressure gas tank and a liquid-gas separator, wherein the outlet of the liquid supply tank is sequentially connected with a liquid pump, a first regulating valve, a first flowmeter and a mixer, the outlet of the low-pressure gas tank is sequentially connected with a compressor, a pressure reducing valve, a second regulating valve, a second flowmeter and a one-way valve, the outlet of the one-way valve is communicated with the mixer, and the outlet of the mixer is communicated with a liquid inlet hole; the liquid return hole is communicated with an inlet of the liquid-gas separator, and an outlet of the liquid-gas separator is respectively communicated with the liquid supply tank and an inlet of the low-pressure gas tank.
The first sealing cover body comprises a front sealing cover and a bearing seat which are sequentially sleeved on the rotor shaft, a first framework seal is arranged between the front sealing cover and the rotor shaft, a first deep groove ball bearing is arranged between the bearing seat and the rotor shaft, and a first bearing locking piece is arranged on one side, close to the first framework seal, of the first deep groove ball bearing; the second sealing cover body comprises a positioning bearing seat and a rear sealing cover which are sequentially sleeved on the rotor shaft, a double-row angular contact bearing is arranged between the positioning bearing seat and the rotor shaft, a second bearing locking piece is arranged on one side of the double-row angular contact bearing close to the rear sealing cover, and a second framework seal is arranged between the rear sealing cover and the rotor shaft; two ends of the sealing shell are respectively connected with the bearing seat and the positioning bearing seat.
The locking mechanism comprises a gland and a locking nut which are sequentially sleeved on the star wheel shaft from bottom to top, and the gland is in close contact with the star wheel.
The star wheel support comprises a support frame, a first hanging ring and a second hanging ring are connected to the support frame, and two ends of a star wheel shaft are movably connected to the first hanging ring and the second hanging ring respectively.
A four-point angular contact bearing and a second deep groove ball bearing are sequentially arranged between the lower end of the star wheel shaft and the second suspension ring from top to bottom, and the second deep groove ball bearing is fixed with the second suspension ring through a lower bearing end cover; and a third deep groove ball bearing is arranged between the upper end of the star wheel shaft and the first hanging ring and is fixed with the first hanging ring through an upper bearing end cover.
The step 3 specifically comprises the following steps:
step 3.1, starting a liquid pump, a compressor and a motor, mixing pressurized lubricating liquid and gas in a mixer, and respectively adjusting the liquid flow and the gas flow through a first adjusting valve and a second adjusting valve to form a high-pressure gas-liquid mixture with the gas volume and the gas content consistent with the gas volume and the gas content in the meshing gap between the actual star wheel and the screw rod;
3.2, enabling the high-pressure gas-liquid mixture to enter the high-pressure sealing cavity through the liquid inlet hole, and controlling the rotating speed of the motor to enable the Reynolds number of fluid in the meshing gap between the star wheel and the screw to be the same as the Reynolds number of fluid in the meshing gap between the actual star wheel and the screw;
3.3, measuring a pressure distribution value of a high-pressure gas-liquid mixture discharged from the upper surface of the star wheel tooth to the lower surface of the star wheel tooth by a pressure sensor; meanwhile, the deflection angle of the star wheel is measured through an angular displacement sensor, and the meshing lubricating performance of the star wheel and the screw rod is obtained; then the gas-liquid mixture in the low-pressure sealing cavity enters the liquid-gas separator through the liquid return hole, and the separated liquid and gas respectively return to the liquid supply tank and the low-pressure gas tank.
In step 3.1, the relationship between the liquid flow and the gas volume gas content lambda of the gas in the pipeline between the mixer and the liquid inlet hole is as follows:
in the above formula, PmIs the mixer outlet line pressure, TmIs the mixer outlet line temperature, RgIs a gas constant, beta is the mass gas fraction in the pipeline between the mixer and the liquid inlet hole, rholIs a liquid phase density;
in the above formula, mgIs the gas mass flow rate, mlIs the liquid mass flow rate;
ml＝ρlql (5)；
in the above formula, qlIs the liquid volumetric flow rate;
in the above formula, qgIs the gas volume flow, PgIs the gas pressure, TgIs the gas temperature.
The invention has the beneficial effects that:
the invention relates to a method for testing the lubricating performance of a screw rod and a star wheel, which provides a sealing environment for the engagement of the screw rod and the star wheel through a first sealing cover body, a second sealing cover body and a sealing shell, measures the pressure distribution value of lubricating liquid leaking from the upper surface of the star wheel tooth to the lower surface of the star wheel tooth, measures the deflection angle of the star wheel, and obtains the lubricating state of the star wheel tooth and the wall surface of a screw groove through the pressure distribution value and the deflection angle; the lubricating state of the single-screw compressor/expander meshing pair with different lubricating media, different compression working media and different molded lines can be tested.
Drawings
FIG. 1 is a schematic view of a single screw compressor;
FIG. 2 is a diagram of the meshing state of an actual screw and a star wheel;
FIG. 3 is a schematic structural diagram of a lubricating performance testing device of a meshing pair according to the present invention;
FIG. 4 is a front sectional view of a lubricating performance testing apparatus of a gear pair according to the present invention;
FIG. 5 is a side sectional view of a lubrication performance testing apparatus of a gear pair according to the present invention;
FIG. 6 is a schematic structural diagram of a liquid supply and return system in the lubricating property testing device of a meshing pair according to the present invention;
FIG. 7 is a comparison of an actual star wheel and a test star wheel of the present invention;
FIG. 8 is a comparison of an actual screw with a test screw of the present invention;
FIG. 9 is a schematic structural diagram of an inside gearing pair of the lubricating property testing apparatus of the inside gearing pair of the present invention;
fig. 10 is a schematic structural view of a star wheel tooth in the lubricating performance testing device of the meshing pair of the present invention.
In the figure: 1. the motor, 2, a coupler, 3, a rotor shaft, 4, a screw rod, 401, a first screw rod, 402, a second screw rod, 5, a sealing shell, 6, a sealing plate, 7, a mounting hole, 8, a pressure sensor, 9, a star wheel shaft, 10, a star wheel bracket, 101, a support frame, 102, a first hanging ring, 103, a second hanging ring, 11, a star wheel, 12, an angular displacement sensor, 13, a liquid inlet hole, 14, a first pressure measuring device mounting seat, 15, a liquid return hole, 16, a second pressure measuring device mounting seat, 17, a front sealing cover, 18, a bearing seat, 19, a first framework seal, 20, a first deep groove ball bearing, 21, a positioning bearing seat, 22, a rear sealing cover, 23, an angular contact bearing, 24, a second framework seal, 25, 26, a locking nut, 27, a four-point angular contact bearing, 28, a second deep groove ball bearing, 29, a lower bearing end cover, 30, a third deep groove, 31. the bearing comprises an upper bearing end cover, 32, a sensor support, 33, a liquid supply tank, 34, a low-pressure gas tank, 35, a liquid-gas separator, 36, a liquid pump, 37, a first regulating valve, 38, a first flowmeter, 39, a mixer, 40, a compressor, 41, a pressure reducing valve, 42, a second regulating valve, 43, a second flowmeter, 44, a one-way valve, 45, a base, 46, a motor support, 47, a rotor support, 48, an elastic cushion block, 49, a sealing pressure plate, 50, a sealing gasket, 51, a first stop gasket, 52, a bearing gasket, 53, a positioning bearing gasket, 54, a second stop gasket, 55, a lead fixing clamp, 56, a collecting ring, 57, a bearing inner pressing ring and 58, a bearing outer pressing ring.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
A testing method for the lubricating performance of a screw and a star wheel in meshing is characterized in that a lubricating fluid is injected into a testing device for testing, as shown in figures 3-5, the testing device comprises a star wheel shaft 9 used for fixing a star wheel 11 and comprises a motor 1, the motor 1 is connected with a rotor shaft 3 used for fixing a screw 4 through a coupler 2, the screw 4 is divided into a first screw 401 and a second screw 402 in order to conveniently install a sealing shell 5, and after the first screw 401 and the sealing shell 5 are installed, the second screw 402 and the first screw 401 are fastened together through bolts. The rotor shaft 3 is sleeved with a first sealing cover body and a second sealing cover body, the screw rod 4 is located between the first sealing cover body and the second sealing cover body, the screw rod 4 is sleeved with the sealing shell 5, and a gap of 0.03-0.1 mm is reserved between the screw rod 4 and the sealing shell 5. Two ends of the sealing shell 5 are respectively connected with the first sealing cover body and the second sealing cover body, a sealing plate 6 is arranged on the inner wall of the sealing shell 5, and the sealing plate 6 extends into the screw groove of the screw rod 4 to separate the screw rod from the screw groove; the sealing shell 5 is provided with a mounting hole 7, and the size of the mounting hole 7 is slightly larger than that of the star wheel 11; 3-10 pressure sensors 8 are arranged along the radial direction of two side walls of the screw rod 4, and signal wires are respectively fixed on the outer walls of the first screw rod 401 and the second screw rod 402 by adopting a lead fixing clamp 55, so that the signal wires are prevented from being wound and damaged by friction with the rotor shaft 3, the sealing shell 5, the first sealing cover body and the second sealing cover body. Star wheel axle 9 swing joint is on star wheel support 10, cup joints the locking mechanism who is used for locking star wheel 11 on star wheel axle 9, and star wheel axle 9 top still is provided with angular displacement sensor 12, and the star wheel 11 tooth stretches into mounting hole 7 and the meshing of screw rod 4, because the both sides surface of star wheel 11 tooth all has the lubricated liquid to pass through, therefore both sides surface all receives the effort of lubricated film, and under the effort of lubricated film, 11 teeth of star wheel take place to deflect towards the less one side of atress. A liquid inlet hole 13 and a first pressure measuring device mounting seat 14 are arranged on a sealing shell 5 between the upper surface of the star wheel 11 and the sealing plate 6, a high-pressure sealing cavity is formed by the upper surface of the star wheel 11, the sealing plate 6 and the inner wall of the screw rod 4, a liquid return hole 15 and a second pressure measuring device mounting seat 16 are arranged between the lower surface of the star wheel 11 and the sealing plate 6, and the first pressure measuring device mounting seat 14 and the second pressure measuring device mounting seat 16 are used for mounting a pressure measuring meter or a pressure sensor; the lower surface of the star wheel 11, the sealing plate 6 and the inner wall of the screw rod 4 form a low-pressure sealing cavity, and when the motor drives the screw rod to rotate, under the driving action of the inner wall of the screw groove of the screw rod 4 on lubricating liquid and the action of the pressure difference between the upper surface and the lower surface of the star wheel 11 teeth, high-pressure gas-liquid mixture is discharged into the low-pressure sealing cavity from the high-pressure sealing cavity along the gap between the star wheel 11 and the screw rod 4. The tooth root of the star wheel 11 is sleeved with a sealing pressure plate 49, the sealing pressure plate 49 is fixed on the sealing shell 5, and a sealing gasket 50 is arranged between the sealing pressure plate 49 and the sealing shell 5. The sealing pad 50 may be made of soft rubber to prevent leakage gaps around the mounting hole 7. Prevent that high-pressure oil gas from leaking to the outside along the clearance around mounting hole 7. The liquid inlet hole 13, the liquid return hole 15 and the liquid supply and return system in fig. 6 form a closed loop.
The rotor shaft 3 is also provided at its end with a slip ring 56, to which slip ring 56 the signal lines of the pressure sensors 8 are connected. The inner ring of the collecting ring 56 rotates along with the rotor shaft 3, the outer ring of the collecting ring 56 is static and is connected with a signal output line of the pressure sensor 8, the outer ring of the inner ring of the collecting ring 56 carries out signal transmission through a sliding contact, and finally the collected data is output to a collection system.
The first sealing cover body comprises a front sealing cover 17 and a bearing seat 18 which are sequentially sleeved on the rotor shaft 3, a first framework seal 19 is arranged between the front sealing cover 17 and the rotor shaft 3, a first deep groove ball bearing 20 is arranged between the bearing seat 18 and the rotor shaft 3, a first bearing locking piece is arranged on one side, close to the first framework seal 19, of the first deep groove ball bearing 20, the first bearing locking piece comprises a first stop washer 51 and a bearing washer 52, and the bearing washer 52 is located between the first deep groove ball bearing 20 and the first stop washer 51; the second sealing cover body comprises a positioning bearing seat 21 and a rear sealing cover 22 which are sequentially sleeved on the rotor shaft 3, a double-row angular contact bearing 23 is arranged between the positioning bearing seat 21 and the rotor shaft 3, a second bearing locking piece is arranged on one side, close to the rear sealing cover 22, of the double-row angular contact bearing 23, and a second framework seal 24 is arranged between the rear sealing cover 22 and the rotor shaft 3; two ends of the sealing shell 5 are respectively connected with the bearing seat 18 and the positioning bearing seat 21; the second bearing lock comprises a positioning bearing washer 53, a second stop washer 54, the positioning bearing washer 53 being located between the second stop washer 54 and the double row angular contact bearing 23. The first deep groove ball bearing 20 and the double-row angular contact bearing 23 are used for bearing the radial force and the axial force of the screw rod 4. The first skeleton seal 19 and the second skeleton seal 24 are used for preventing lubricating liquid from leaking along the axial direction of the screw rod 4.
The locking mechanism comprises a gland 25 and a locking nut 26 which are sequentially sleeved on the star wheel shaft 9 from bottom to top, and the gland 25 is tightly contacted with the star wheel 11.
The star wheel support 10 comprises a support frame 101, a first hanging ring 102 and a second hanging ring 103 are connected to the support frame 101, and two ends of the star wheel shaft 9 are movably connected to the first hanging ring 102 and the second hanging ring 103 respectively.
A four-point angular contact bearing 27 and a second deep groove ball bearing 28 are sequentially arranged between the lower end of the star wheel shaft 9 and the second hanging ring 103 from top to bottom, the second deep groove ball bearing 28 is fixed with the second hanging ring 103 through a lower bearing end cover 29, and a bearing inner pressing ring 57 and a bearing outer pressing ring 58 are arranged between the four-point angular contact bearing 27 and the second deep groove ball bearing 28; a third deep groove ball bearing 30 is arranged between the upper end of the star wheel shaft 9 and the first hanging ring 102, and the third deep groove ball bearing 30 is fixed with the first hanging ring 102 through an upper bearing end cover 31.
The star wheel carrier 10 is provided with a sensor support 32, and the angular displacement sensor 12 is mounted on the sensor support 32.
The motor is characterized by further comprising a base 45, a motor support 46 and a rotor support 47 are arranged on the base 45, an elastic cushion block 48 is arranged between the motor support 46 and the motor 1, and the rotor support 47 is located below the screw rod 4.
The liquid supply and return system comprises a liquid supply tank 33, a low-pressure gas tank 34 and a liquid-gas separator 35, wherein an outlet of the liquid supply tank 33 is sequentially connected with a liquid pump 36, a first regulating valve 37, a first flow meter 38 and a mixer 39, an outlet of the low-pressure gas tank 34 is sequentially connected with a compressor 40, a pressure reducing valve 41, a second regulating valve 42, a second flow meter 43 and a one-way valve 44, an outlet of the one-way valve 44 is communicated with the mixer 39, and an outlet of the mixer 39 is communicated with the liquid inlet hole 13; a pressure measuring device and a temperature measuring device are arranged on a pipeline between the second flowmeter 43 and the mixer 39, and a pressure measuring device and a temperature measuring device are arranged on a pipeline between the mixer 39 and the liquid inlet 13; the liquid return hole 15 is communicated with an inlet of a liquid-gas separator 35, and an outlet of the liquid-gas separator 35 is respectively communicated with an inlet of a liquid supply tank 33 and an inlet of a low-pressure gas tank 34.
The method specifically comprises the following steps:
in the above formula, the first and second carbon atoms are,
as a coordinate system S1And a coordinate system S2The x-axis angle between them, when transforming the geometry of the front side of the star wheel teeth:
when converting the geometry of the rear side of the star wheel teeth:
front side screw groove deflection angle alpha of star wheel toothfThe expression of (a) is as follows:
in the above formula, n1Is the number of screw heads, n2Is the number of teeth of the star wheel, rf1The distance r from the meshing point at the front side of the star wheel teeth to the rotating axis of the screw rodf2From the meshing point of the front side of the star wheel tooth to the starThe wheel rotation axis distance;
rear side screw groove deflection angle alpha of star wheel toothbThe expression of (a) is as follows:
in the above formula, rb1The distance r from the meshing point at the rear side of the star wheel teeth to the rotation axis of the screw rodb2The distance from the meshing point at the rear side of the star wheel tooth to the rotation axis of the star wheel.
and 3, mounting the star wheel obtained in the step 2 on a testing device for testing the lubricating performance, wherein in the testing process, the Reynolds number of the lubricating fluid in the meshing gap between the star wheel and the screw is the same as the Reynolds number of the lubricating fluid in the actual meshing gap between the star wheel and the screw, and simultaneously, the lubricating fluid with the same volume and gas content as the gas in the actual meshing gap between the star wheel and the screw is obtained by adjusting the liquid flow and the gas flow.
The step 3 specifically comprises the following steps:
3.1, a liquid pump 36 is started to pressurize the lubricating liquid flowing out of a liquid supply tank 33, a compressor 40 is started to pressurize the gas flowing out of a low-pressure gas tank 34, the motor 1 is started at the same time, the pressurized lubricating liquid and the gas are mixed in a mixer 39, and the liquid flow and the gas flow are respectively regulated through a first regulating valve 37 and a second regulating valve 42 to form a high-pressure gas-liquid mixture which is consistent with the gas volume and the gas content in the actual meshing gap between the star wheel and the screw;
the relationship between the liquid flow and the gas volume gas content in the meshing clearance between the actual star wheel and the screw is as follows:
the gas pressure P is measured by the pressure measuring device and the temperature measuring device between the second flowmeter 43 and the mixer 39gGas temperature TgIn combination with the volumetric flow q of the gas measured by the second flow meter 43gCalculating the gas mass flow m according to the following formulag：
In the above formula, qgIs the gas volume flow, PgIs the gas pressure, TgIs the gas temperature, RgJ/(kg. K) is the gas constant;
from the volumetric flow q of the liquid measured by the first flow meter 38lAnd the mass flow m of the liquid body can be obtained through calculationl：
ml＝ρql (5)；
In the above formula, ρlIs the density of the liquid phase, qlIs the liquid volumetric flow rate;
the mass gas fraction beta between the mixer 39 and the liquid inlet hole 13 is calculated by using the mass conservation law:
according to the pressure P measured by the pressure measuring device between the mixer 39 and the liquid inlet hole 13mT measured by temperature measuring devicemAnd the mass gas fraction beta between the mixer 39 and the liquid inlet hole 13, the volume gas fraction in the mixer is obtained:
in the above formula, PmIs the outlet line pressure, T, of the mixer (39)mIs the mixer (39) outlet line temperature;
3.2, the high-pressure gas-liquid mixture enters the high-pressure sealing cavity through the liquid inlet hole 13, and the rotating speed of the motor 1 is controlled to enable the Reynolds number of fluid in the meshing gap between the star wheel and the screw to be the same as the Reynolds number of fluid in the meshing gap between the actual star wheel and the screw;
3.3, when the high-pressure gas-liquid mixture is discharged into the low-pressure sealing cavity from the high-pressure sealing cavity along the gap between the star wheel 11 and the screw 4, measuring a pressure distribution value of the high-pressure gas-liquid mixture discharged into the lower surface of the star wheel 11 from the upper surface of the star wheel 11; meanwhile, the deflection angle of the star wheel 11 is measured through the angular displacement sensor 12, and the meshing lubricating performance of the star wheel and the screw rod is obtained; the gas-liquid mixture in the low-pressure sealing cavity enters the liquid-gas separator 35 through the liquid return hole 15, and the separated liquid and gas respectively return to the liquid supply tank 33 and the low-pressure gas tank 34.
The larger the area of the high-pressure area of the pressure distribution value is and the higher the pressure peak value of the high-pressure area is, the larger the bearing capacity of the lubricating film is, the better the lubricating state of the star wheel teeth and the screw groove wall surface is, otherwise, the poor lubricating state is. The smaller the deflection angle is, the more balanced the stress on the two side surfaces of the star wheel tooth is, the larger the deflection angle is, the larger the bearing capacity of the lubricating film on the side of the star wheel tooth away from the deflection direction is, and the smaller the bearing capacity of the lubricating film on the same side of the deflection direction is. The small bearing capacity of the lubricating film indicates that the lubrication state of the side surface of the star wheel tooth is poor and the abrasion is easy to occur.
According to the method, the first sealing cover body, the second sealing cover body and the sealing shell are used for providing a sealing environment for the engagement of the screw and the star wheel, the pressure distribution value of lubricating liquid leaking from the upper surface of the star wheel tooth to the lower surface of the star wheel tooth is measured, the deflection angle of the star wheel is measured at the same time, and the lubricating state of the star wheel tooth and the wall surface of the screw groove is obtained through the pressure distribution value and the deflection angle; the lubricating state of the single-screw compressor/expander meshing pair with different lubricating media, different compression working media and different molded lines can be tested.
Claims (7)
1. A method for testing the lubricating performance of a screw rod meshed with a star wheel injects a lubricating fluid into a testing device for testing, and is characterized by comprising the following steps:
step 1, carrying out characteristic points S on each geometric form of tooth surface of actual star wheel1(x1,y1,z1) Converted into a test star wheel tooth surface geometric form characteristic point S2(x2,y2,z2) And the meshing clearance geometrical shapes of the star wheel and the screw rod before and after conversion are the same;
step 2, according to the testing star wheel teethFeature point S of surface geometry2(x2,y2,z2) Processing to obtain a star wheel;
step 3, the star wheel obtained in the step 2 is installed on a testing device for testing the lubricating performance, in the testing process, the Reynolds number of the lubricating fluid in the meshing gap between the star wheel and the screw is the same as the Reynolds number of the lubricating fluid in the actual meshing gap between the star wheel and the screw, and meanwhile the lubricating fluid with the same volume and gas content as the gas in the actual meshing gap between the star wheel and the screw is obtained by adjusting the liquid flow and the gas flow;
the testing device comprises a motor (1), wherein the motor (1) is connected with a rotor shaft (3) for fixing a screw (4) through a coupler (2), a first sealing cover body and a second sealing cover body are sleeved on the rotor shaft (3), the screw (4) is positioned between the first sealing cover body and the second sealing cover body, a sealing shell (5) is sleeved outside the screw (4), two ends of the sealing shell (5) are respectively connected with the first sealing cover body and the second sealing cover body, a sealing plate (6) is arranged on the inner wall of the sealing shell (5), and the sealing plate (6) extends into a screw groove of the screw (4) to separate the screw; the sealing shell (5) is provided with a mounting hole (7), and the screw (4) is provided with a pressure sensor (8); the star wheel (11) is movably connected to a star wheel support (10) through a star wheel shaft (9), a locking mechanism used for locking the star wheel (11) is sleeved on the star wheel shaft (9), an angular displacement sensor (12) is further arranged above the star wheel shaft (9), teeth of the star wheel (11) extend into a mounting hole (7) to be meshed with the screw rod (4), a liquid inlet hole (13) is formed in a sealing shell (5) between the upper surface of the star wheel (11) and the sealing plate (6), and a liquid return hole (15) is formed between the lower surface of the star wheel (11) and the sealing plate (6); the liquid supply and return system comprises a liquid supply box (33), a low-pressure gas tank (34) and a liquid-gas separator (35), wherein an outlet of the liquid supply box (33) is sequentially connected with a liquid pump (36), a first regulating valve (37), a first flow meter (38) and a mixer (39), an outlet of the low-pressure gas tank (34) is sequentially connected with a compressor (40), a pressure reducing valve (41), a second regulating valve (42), a second flow meter (43) and a one-way valve (44), an outlet of the one-way valve (44) is communicated with the mixer (39), and an outlet of the mixer (39) is communicated with a liquid inlet hole (13); the liquid return hole (15) is communicated with an inlet of a liquid-gas separator (35), and an outlet of the liquid-gas separator (35) is respectively communicated with an inlet of a liquid supply tank (33) and an inlet of a low-pressure gas tank (34);
3.1, starting the liquid pump (36), the compressor (40) and the motor (1), mixing the pressurized lubricating liquid and the pressurized gas in the mixer (39), and respectively adjusting the liquid flow and the gas flow through the first adjusting valve (37) and the second adjusting valve (42) to form a high-pressure gas-liquid mixture with the gas volume and the gas content consistent with the gas volume and the gas content in the actual meshing gap between the star wheel and the screw;
3.2, the high-pressure gas-liquid mixture enters the high-pressure sealing cavity through the liquid inlet hole (13), and the rotating speed of the motor (1) is controlled to enable the Reynolds number of fluid in the meshing gap between the star wheel and the screw to be the same as the Reynolds number of fluid in the meshing gap between the actual star wheel and the screw;
3.3, measuring a pressure distribution value of a high-pressure gas-liquid mixture discharged from the upper surface of the tooth of the star wheel (11) to the lower surface of the tooth of the star wheel (11) by the pressure sensor (8); meanwhile, the deflection angle of the star wheel (11) is measured through the angular displacement sensor (12), and the meshing lubricating performance of the star wheel (11) and the screw (4) is obtained; then the gas-liquid mixture in the low-pressure sealing cavity enters a liquid-gas separator (35) through a liquid return hole (15), and the separated liquid and gas respectively return to a liquid supply tank (33) and a low-pressure gas tank (34).
2. The method for testing the lubricating property of the meshing of the screw and the star wheel according to the claim 1, wherein the step 1 is to test each geometric form characteristic point S of the actual star wheel tooth surface1(x1,y1,z1) Converted into a test star wheel tooth surface geometric form characteristic point S2(x2,y2,z2) The method of (1) is as follows:
in the above formula, the first and second carbon atoms are,
as a coordinate system S1And a coordinate system S2X-axis angle therebetween when switchedGeometry of the front side of the star wheel teeth:
when converting the geometry of the rear side of the star wheel teeth:
3. the method for testing the lubricating property of the screw meshed with the star wheel according to claim 1, wherein the first sealing cover body comprises a front sealing cover (17) and a bearing seat (18) which are sequentially sleeved on the rotor shaft (3), a first skeleton seal (19) is arranged between the front sealing cover (17) and the rotor shaft (3), a first deep groove ball bearing (20) is arranged between the bearing seat (18) and the rotor shaft (3), and a first bearing locking piece is arranged on one side, close to the first skeleton seal (19), of the first deep groove ball bearing (20); the second sealing cover body comprises a positioning bearing seat (21) and a rear sealing cover (22) which are sequentially sleeved on the rotor shaft (3), a double-row angular contact bearing (23) is arranged between the positioning bearing seat (21) and the rotor shaft (3), a second bearing locking piece is arranged on one side, close to the rear sealing cover (22), of the double-row angular contact bearing (23), and a second framework seal (24) is arranged between the rear sealing cover (22) and the rotor shaft (3); and two ends of the sealing shell (5) are respectively connected with the bearing seat (18) and the positioning bearing seat (21).
4. The method for testing the lubricating property of the screw meshed with the star wheel according to claim 1, wherein the locking mechanism comprises a gland (25) and a locking nut (26) which are sequentially sleeved on the star wheel shaft (9) from bottom to top, and the gland (25) is in close contact with the star wheel (11).
5. The method for testing the lubricating property of the screw meshed with the star wheel according to claim 1, wherein the star wheel support (10) comprises a support frame (101), a first hanging ring (102) and a second hanging ring (103) are connected to the support frame (101), and two ends of the star wheel shaft (9) are movably connected to the first hanging ring (102) and the second hanging ring (103) respectively.
6. The screw and star wheel meshing lubricating property testing method according to claim 5, wherein a four-point angular contact bearing (27) and a second deep groove ball bearing (28) are sequentially arranged between the lower end of the star wheel shaft (9) and the second hanging ring (103) from top to bottom, and the second deep groove ball bearing (28) is fixed with the second hanging ring (103) through a lower bearing end cover (29); a third deep groove ball bearing (30) is arranged between the upper end of the star wheel shaft (9) and the first hanging ring (102), and the third deep groove ball bearing (30) is fixed with the first hanging ring (102) through an upper bearing end cover (31).
7. A method for testing the lubrication performance of a screw-spider engagement according to claim 1, wherein in step 3.1 the relationship between the liquid flow rate, the gas flow rate and the gas volume fraction λ in the line between the mixer (39) and the inlet opening (13) is as follows:
in the above formula, PmIs the outlet line pressure, T, of the mixer (39)mIs the outlet line temperature, R, of the mixer (39)gBeta is the gas constant, beta is the mass gas content in the pipeline between the mixer (39) and the liquid inlet hole (13), rholIs a liquid phase density;
in the above formula, mgIs the gas mass flow rate, mlIs the liquid mass flow rate;
ml＝ρlql (5)；
in the above formula, qlIs the liquid volumetric flow rate;
in the above formula, qgIs the gas volume flow, PgIs the gas pressure, TgIs the gas temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110030635.6A CN112763208B (en) | 2021-01-11 | 2021-01-11 | Method for testing lubricating performance of screw rod and star wheel meshing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110030635.6A CN112763208B (en) | 2021-01-11 | 2021-01-11 | Method for testing lubricating performance of screw rod and star wheel meshing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112763208A CN112763208A (en) | 2021-05-07 |
| CN112763208B true CN112763208B (en) | 2022-03-22 |
Family
ID=75701276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110030635.6A Active CN112763208B (en) | 2021-01-11 | 2021-01-11 | Method for testing lubricating performance of screw rod and star wheel meshing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112763208B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU805100A1 (en) * | 1978-06-01 | 1981-02-15 | Херсонский Филиал Одесскоготехнологического Института Пищевойпромышленности Им. M.B.Ломоносова | Device for measuring lubrication layer thickness in plain bearing |
| DE3140661C1 (en) * | 1981-10-13 | 1983-02-03 | Lubricants International AG, 9490 Vaduz | Device for simulating the stress of two bodies sliding and rolling against each other, in particular gear wheels |
| JPH0735223A (en) * | 1993-07-19 | 1995-02-07 | Mitsubishi Motors Corp | Lubrication mechanism of speed meter gear of transmission |
| CN1588057A (en) * | 2004-08-06 | 2005-03-02 | 浙江大学 | Axial plunger pump piston shoe auxiliary lubrication characteristic test device |
| CN106017931A (en) * | 2016-07-18 | 2016-10-12 | 上海交通大学 | Device and method for testing lubrication performance of water-lubricated bearing under working condition of axis misalignment |
| CN107631876A (en) * | 2017-08-08 | 2018-01-26 | 中国船舶重工集团公司第七〇九研究所 | One kind is used for dynamic loading properties of journal bearing lubricated lubrication friction property test platform |
| CN108051326A (en) * | 2017-12-29 | 2018-05-18 | 好米动力设备有限公司 | A kind of experimental provision for being used to observe screw rod and star-wheel meshing wear |
| CN108331757A (en) * | 2018-02-11 | 2018-07-27 | 好米动力设备有限公司 | A kind of performance test experiment table for single screw compressor |
| CN208254783U (en) * | 2018-05-30 | 2018-12-18 | 顺气压缩机技术（苏州）有限公司 | A kind of experimental rig for screw air compressor |
| CN109870377A (en) * | 2019-03-29 | 2019-06-11 | 中国矿业大学 | A kind of fluid lubrication friction wear testing machine and method |
| CN110219802A (en) * | 2019-06-27 | 2019-09-10 | 西安交通大学 | A kind of three motor-driven single screw compressors |
-
2021
- 2021-01-11 CN CN202110030635.6A patent/CN112763208B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU805100A1 (en) * | 1978-06-01 | 1981-02-15 | Херсонский Филиал Одесскоготехнологического Института Пищевойпромышленности Им. M.B.Ломоносова | Device for measuring lubrication layer thickness in plain bearing |
| DE3140661C1 (en) * | 1981-10-13 | 1983-02-03 | Lubricants International AG, 9490 Vaduz | Device for simulating the stress of two bodies sliding and rolling against each other, in particular gear wheels |
| JPH0735223A (en) * | 1993-07-19 | 1995-02-07 | Mitsubishi Motors Corp | Lubrication mechanism of speed meter gear of transmission |
| CN1588057A (en) * | 2004-08-06 | 2005-03-02 | 浙江大学 | Axial plunger pump piston shoe auxiliary lubrication characteristic test device |
| CN106017931A (en) * | 2016-07-18 | 2016-10-12 | 上海交通大学 | Device and method for testing lubrication performance of water-lubricated bearing under working condition of axis misalignment |
| CN107631876A (en) * | 2017-08-08 | 2018-01-26 | 中国船舶重工集团公司第七〇九研究所 | One kind is used for dynamic loading properties of journal bearing lubricated lubrication friction property test platform |
| CN108051326A (en) * | 2017-12-29 | 2018-05-18 | 好米动力设备有限公司 | A kind of experimental provision for being used to observe screw rod and star-wheel meshing wear |
| CN108331757A (en) * | 2018-02-11 | 2018-07-27 | 好米动力设备有限公司 | A kind of performance test experiment table for single screw compressor |
| CN208254783U (en) * | 2018-05-30 | 2018-12-18 | 顺气压缩机技术（苏州）有限公司 | A kind of experimental rig for screw air compressor |
| CN109870377A (en) * | 2019-03-29 | 2019-06-11 | 中国矿业大学 | A kind of fluid lubrication friction wear testing machine and method |
| CN110219802A (en) * | 2019-06-27 | 2019-09-10 | 西安交通大学 | A kind of three motor-driven single screw compressors |
Non-Patent Citations (4)
| Title |
|---|
| Development and Experimental Study of the First Stage in a Two-Stage Water-Flooded Single-Screw Compressor Unit for Polyethylene Terephthalate Bottle Blowing System;Ting Li 等;《Energies》;20200816;全文 * |
| The energy performance of a single-screw compressor for natural gas liquefaction process: Effects of the lubricating oil flow rate;Yong li;《INTERNATIONAL JOURNAL OF ENERGY RESEARCH》;20190325;第43卷(第4期);全文 * |
| 单螺杆压缩机型线和流体动力润滑的研究;金光熹 等;《西安交通大学学报》;19821231;第16卷(第6期);全文 * |
| 基I-DEAS的单螺杆压缩机啮合副润滑特性的研究;刘钰 等;《压缩机技术》;20071231(第2期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112763208A (en) | 2021-05-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101876590B (en) | Comprehensive performance test table for water-lubricated dynamic-static pressure radial sliding bearing | |
| CN109406152A (en) | A kind of aero-engine is to turning birotor kinetic characteristics experiment porch | |
| CN111060313B (en) | Sliding bearing performance test experiment table under oil film cavitation state | |
| CN112324591B (en) | Low-temperature high-rotating-speed floating ring sealing test device for rocket engine | |
| CN105973600A (en) | Multifunctional water-lubricated thrust bearing system testing platform | |
| CN107328579A (en) | The experimental rig of radial journal bearing greasy property test is slided in a kind of dynamic pressure | |
| CN112763208B (en) | Method for testing lubricating performance of screw rod and star wheel meshing | |
| WO2021208171A1 (en) | Testing and detection device and testing method for seawater desalination pump and energy recovery integrated machine | |
| CN111947855A (en) | Low-temperature dynamic seal test bed and test method | |
| CN107489609B (en) | Vertical gap flow dynamic characteristic coefficient testing device | |
| CN115541134A (en) | Low-temperature high-speed double-station end face seal test device and method for hydrogen-oxygen turbine pump | |
| CN112881003B (en) | Screw rod and star gear meshed lubricating property testing device | |
| CN103437992A (en) | Dynamic characteristic simulation experiment set of five-parallel-shaft tooth-type compressor | |
| CN206960120U (en) | The experimental rig of radial journal bearing greasy property test is slided in a kind of dynamic pressure | |
| CN101608937B (en) | Low-pulsation gear flowmeter of composite gear type | |
| CN209083565U (en) | Nitrogen-sealed screw vacuum pump built in exhaust side | |
| CN214196658U (en) | Lubricating property testing device of meshing pair | |
| CN205879530U (en) | Lubricated thrust bearing systematic testing platform of multi -functional water | |
| CN108760156A (en) | The experimental rig of core main pump self-loopa oil pump and oily mechanical sealing performance | |
| CN115235747A (en) | Multifunctional testing device for oil seal of differential | |
| CN105756715B (en) | High energy air power rotor engine assembly | |
| CN101776065B (en) | High-pressure sealing driver of oil-extracting screw pump | |
| CN208396963U (en) | Two phase flow fluid machinery flow passage components polishing machine test device | |
| CN207095856U (en) | Each oil spout point oil mass distribution measurement apparatus of speed changer leaching oil pipe line | |
| CN207093438U (en) | A kind of axial flow compressor lubricating oil station |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |