CN112881003A - Screw rod and star gear meshed lubricating property testing device - Google Patents
Screw rod and star gear meshed lubricating property testing device Download PDFInfo
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- CN112881003A CN112881003A CN202110030597.4A CN202110030597A CN112881003A CN 112881003 A CN112881003 A CN 112881003A CN 202110030597 A CN202110030597 A CN 202110030597A CN 112881003 A CN112881003 A CN 112881003A
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- G01M13/00—Testing of machine parts
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a device for testing the lubricating performance of a screw engaged with a star wheel, which comprises a motor, wherein the motor is connected with a rotor shaft for fixing the screw through a coupler, a first sealing cover body and a second sealing cover body are sleeved on the rotor shaft, the first sealing cover body, the second sealing cover body and a sealing shell form a sealing cavity, the screw is positioned in the sealing cavity, 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 to separate the screw; the sealing shell is provided with a mounting hole, and the screw rod is provided with a pressure sensor; the star wheel shaft is movably connected to the star wheel bracket, an angular displacement sensor is further arranged above the star wheel shaft, star wheel teeth extend into the mounting hole to be meshed with the screw rod, and a liquid inlet hole and a liquid return hole are respectively formed in a sealing shell between the upper surface and the lower surface of the star wheel and the sealing plate; the liquid feeding and returning system is also included, and the liquid feeding hole, the liquid feeding and returning system and the liquid returning hole form a closed loop. The testing device can realize the testing of the lubrication state of the single-screw compressor/expander meshing pair.
Description
Technical Field
The invention belongs to the technical field of compressor testing equipment, and relates to a lubricating performance testing device for meshing of a screw and a star wheel.
Background
The single-screw compressor has the advantages of simple structure, no residual space volume, balanced rotor stress, low requirement on working media (superheated steam, saturated steam and gas-liquid phases can be used), and the like, is successfully applied to the fields of heat pumps, central air conditioners and industrial refrigeration, and has great development prospect. In recent years, due to the development of low-temperature and medium-low-temperature waste heat recovery technologies, science and technology workers have successfully developed a single-screw expander on the basis of a single-screw compressor, and at present, a prototype of the expander has been successfully trial-manufactured and applied to a low-temperature power generation test system.
In the case of a single screw compressor or an expander, the core components are a screw and two star wheels meshing with the screw (one screw and one star wheel are generally called 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 lubrication state in the gap thereof is not known at all.
Disclosure of Invention
The invention aims to provide a device for testing the lubricating property of a screw rod meshed with a star wheel, which solves the problem that the lubricating state of a meshing pair cannot be tested in the prior art.
The technical scheme adopted by the invention is that the screw and star wheel meshed lubrication performance testing device comprises a screw and a star wheel, wherein a meshing pair comprises the screw and the star wheel, the star wheel is fixed through a star wheel shaft and comprises a motor, the motor is connected with a rotor shaft for fixing the screw through a coupler, a first sealing cover body and a second sealing cover body are sleeved on the rotor shaft, the screw is positioned between the first sealing cover body and the second sealing cover body, a sealing shell is sleeved outside the screw, 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 to separate the screw and the; the sealing shell is provided with a mounting hole, and the screw rod is provided with a pressure sensor; the star wheel shaft is movably connected to the star wheel support, a locking mechanism for locking the star wheel is sleeved on the star wheel shaft, an angular displacement sensor is further arranged above the star wheel shaft, star wheel teeth extend into the mounting hole to be meshed with the screw rod, a liquid inlet hole is formed in a sealing shell between the upper surface of the star wheel and the sealing plate, and a liquid return hole is formed between the lower surface of the star wheel and the sealing plate; the liquid feeding and returning system is also included, and the liquid feeding hole, the liquid feeding and returning system and the liquid returning hole form a closed loop.
The invention is also characterized in that:
the star wheel tooth root is sleeved with a sealing pressure plate, the sealing pressure plate is fixed on the sealing shell, and a sealing gasket is arranged between the sealing pressure plate and the sealing shell.
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 star wheel support is provided with a sensor support, and the angular displacement sensor is arranged on the sensor support.
The motor support and the rotor support are arranged on the base, an elastic cushion block is arranged between the motor support and the motor, and the rotor support is located below the screw rod.
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 invention has the beneficial effects that:
according to the lubricating performance testing device for the meshing of the screw and the star wheel, a sealing environment is provided for the meshing of the screw and the star wheel through the first sealing cover body, the second sealing cover body and the sealing shell, 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.
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 screw-star meshing lubrication performance testing device according to the present invention;
FIG. 4 is a front cross-sectional view of a screw-star meshing lubrication performance testing apparatus of the present invention;
FIG. 5 is a cross-sectional side view of a screw-to-star meshing lubrication performance testing apparatus of the present invention;
FIG. 6 is a schematic structural diagram of a liquid supply and return system in the screw and star wheel meshed lubrication performance testing device of 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 inner gearing pair of the lubricating property testing device for the screw rod and the star wheel in the invention;
FIG. 10 is a schematic view of the structure of the star wheel teeth in the device for testing the lubrication performance of the screw engaged with the star wheel according to 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.
The utility model provides a screw rod and star gear meshed lubrication performance testing arrangement, as shown in fig. 3-5, the meshing is vice including screw rod 4, star gear 11, and star gear 11 is fixed through star gear axle 9, including motor 1, motor 1 is connected with rotor shaft 3 that is used for fixed screw rod 4 through shaft coupling 2, for the convenience of installation seal shell 5, divide into first screw rod 401, second screw rod 402 with screw rod 4, treat that first screw rod 401 and seal shell 5 installation accomplish the back, pass through the bolt-up with second screw rod 402 and first screw rod 401 again and be in the same place. 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 sensor 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 gasket 50 can be made of soft rubber to prevent high-pressure oil gas from leaking outwards along the gaps around the 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, the 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; 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. A pressure measuring device and a temperature measuring device are sequentially arranged on a pipeline between the second flowmeter 43 and the mixer 39, and the mass flow of the high-pressure gas can be calculated by combining the volume flow measured by the second flowmeter 43; the pipeline between the mixer 39 and the liquid inlet 13 is provided with a pressure measuring device and a temperature measuring device, and the volume of the high-pressure gas in the pipeline of the mixer can be obtained through the temperature and the pressure at the position and the mass flow rate on the high-pressure gas transmission pipeline, and the gas content of the two-phase liquid gas can be further obtained. Two-phase lubricating liquid with the gas volume and the gas content which are consistent with those in the actual meshing pair clearance of the compressor can be obtained by adjusting the flow of the liquid path and the flow of the gas path.
The invention discloses a use method of a screw and star wheel meshed lubrication performance testing device, which comprises the following steps:
in the above formula, the first and second carbon atoms are,
as a coordinate system S1And a coordinate system S2X-axis angle therebetween, if star-wheel tooth front side geometry
If the geometrical shape of the rear side of the star wheel tooth is
At a certain meshing position, the front side of the star wheel tooth is provided with a screw groove deflection angle alphafThe 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;
at a certain meshing position, the rear side of the star wheel tooth is provided with a screw groove deflection angle alphabThe 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;
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＝ρlql (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 discharged from the mixer (39)Pressure in the mouth line, TmIs 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 lubricating performance testing device for the meshing of the screw and the star wheel, disclosed by the invention, a sealing environment is provided for the meshing of the screw and the star wheel through the first sealing cover body, the second sealing cover body and the sealing shell, 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 (9)
1. The screw rod and star wheel meshed lubrication performance testing device is characterized by comprising a motor (1), wherein the motor (1) is connected with a rotor shaft (3) used for fixing the screw rod (4) through a coupler (2), 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, a sealing shell (5) is sleeved outside the screw rod (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 rod (4) to separate the screw rod (4); 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 shaft (9) is movably connected to a star wheel support (10), a locking mechanism for locking a 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 a 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 a 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 feeding and returning system is further included, and the liquid feeding hole (13), the liquid feeding and returning system and the liquid returning hole (15) form a closed loop.
2. The screw rod and star wheel meshed lubrication performance testing device according to claim 1, wherein a sealing pressure plate (49) is sleeved on a tooth root of the star wheel (11), 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).
3. The screw and star wheel meshed lubrication performance testing device 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 screw rod and star wheel meshed lubrication performance testing device 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 screw rod and star wheel meshed lubrication performance testing device 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 meshed lubrication performance testing device 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. The screw-and-star wheel meshing lubrication performance testing device is characterized in that a sensor support (32) is arranged on the star wheel support (10), and the angular displacement sensor (12) is mounted on the sensor support (32).
8. The screw and star wheel meshed lubrication performance testing device according to claim 1, further comprising a base (45), wherein a motor support (46) and a rotor support (47) are arranged on the base (45), an elastic cushion block (47) is arranged between the motor support (46) and the motor (1), and the rotor support (47) is located below the screw (4).
9. The screw and star wheel meshed lubrication performance testing device according to claim 1, wherein the liquid supply and return system comprises a liquid supply tank (33), a low-pressure gas tank (34) and a liquid-gas separator (35), 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); 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).
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| CN202110030597.4A CN112881003B (en) | 2021-01-11 | 2021-01-11 | Screw rod and star gear meshed lubricating property testing device |
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| CN202110030597.4A CN112881003B (en) | 2021-01-11 | 2021-01-11 | Screw rod and star gear meshed lubricating property testing device |
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| CN112881003A true CN112881003A (en) | 2021-06-01 |
| CN112881003B CN112881003B (en) | 2022-03-25 |
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| CN111271283A (en) * | 2020-03-01 | 2020-06-12 | 邵凯 | Shaft seal-free water-lubricated single-screw oil-free compressor for balancing pressure by using screw hole |
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| US5467644A (en) * | 1993-04-26 | 1995-11-21 | Schaffer; Larry | Universal transmission tester |
| DE19921031A1 (en) * | 1999-05-06 | 1999-11-18 | Carsten Ramcke | Testing stand for gears and other objects for checking of balance or eccentricity |
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|---|---|
| CN112881003B (en) | 2022-03-25 |
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