CN118362498B - Spent oil lubrication mechanical seal test device and mechanical seal performance test method - Google Patents
Spent oil lubrication mechanical seal test device and mechanical seal performance test method Download PDFInfo
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- CN118362498B CN118362498B CN202410801378.5A CN202410801378A CN118362498B CN 118362498 B CN118362498 B CN 118362498B CN 202410801378 A CN202410801378 A CN 202410801378A CN 118362498 B CN118362498 B CN 118362498B
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- 238000012360 testing method Methods 0.000 title claims abstract description 37
- 238000005461 lubrication Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 5
- 238000011056 performance test Methods 0.000 title description 4
- 238000007789 sealing Methods 0.000 claims abstract description 76
- 238000003825 pressing Methods 0.000 claims abstract description 22
- 230000003068 static effect Effects 0.000 claims abstract description 5
- 230000014392 establishment of spindle localization Effects 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 10
- 210000001503 joint Anatomy 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 230000001050 lubricating effect Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000004227 thermal cracking Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
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- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- Mechanical Sealing (AREA)
Abstract
The invention relates to the field of mechanical seal testing, in particular to a spent oil lubrication mechanical seal testing device which comprises a shell, wherein openings at two ends of the shell are arranged in a cylindrical shape, sealing end covers are arranged at the openings at two ends of the shell, and the two sealing end covers and the shell are enclosed to form a sealing cavity for seal testing; one end of the main shaft is coaxially inserted into the sealing cavity; the outer ring of the main shaft is coaxially provided with a shaft sleeve which can axially slide along the main shaft and is in rotation-stopping fit with the main shaft, two groups of mechanical seals to be tested are symmetrically arranged on the shaft sleeve, static rings of the mechanical seals are pressed and fixed on corresponding seal end covers by a first locking piece, and movable rings of the mechanical seals are pressed and fixed on shaft sleeve positioning steps of the shaft sleeve by a second locking piece; the main shaft body is provided with a main shaft positioning step, and the end part of the main shaft positioned in the sealing cavity is provided with a shaft sleeve pressing piece for pressing and fixing the shaft sleeve on the main shaft positioning step. The invention can realize the test of mechanical seals with different sizes and is rapid to assemble and disassemble.
Description
Technical Field
The invention relates to the field of mechanical seal testing, in particular to a spent oil lubrication mechanical seal testing device and a mechanical seal performance testing method.
Background
The mechanical seal is an axial end face sealing device which achieves end face sealing perpendicular to the rotation axis by means of pretension of elastic elements (springs or bellows and the like) on friction pairs of end faces of a dynamic ring and a static ring and compression of fluid medium pressure and elastic element pressure (or magnetic force). In the aerospace field, mechanical sealing of a speed reducer system is limited by working environment, structural space and the like, and is mostly in splash and oil injection insufficient lubrication working conditions, the sealing faces dry friction and boundary friction states, the friction heat is large, the end face temperature is high, the sealing ring is severely deformed, and excessive abrasion, thermal cracking and the like of the mechanical sealing ring are easily caused. In order to avoid equipment shutdown and maintenance caused by faults after the mechanical seal is installed, static pressure and operation tests are often required to be carried out on the mechanical seal before the mechanical seal is installed to verify the sealing performance.
The existing mechanical seal test device is mainly characterized in that the operation working condition of the mechanical seal test device is a full-medium lubrication working condition, the insufficient lubrication and oil lack working condition is lacked, the test tool structure is single, the mechanical seal test device is only suitable for mechanical seals with certain specific sizes, different test tools are required to be designed and processed for mechanical seals with different sizes, the use cost is high, the disassembly and the replacement are extremely inconvenient, the time period is long, and therefore the mechanical seal test device is needed to be solved.
Disclosure of Invention
In order to avoid and overcome the technical problems in the prior art, the invention provides a spent oil lubrication mechanical seal test device. The invention can realize the test of mechanical seals with different sizes and is rapid to assemble and disassemble. The invention also provides a mechanical sealing performance test method to realize the real-time calculation of the mechanical sealing friction coefficient under different lubricating degrees of the spent oil.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the utility model provides a spent oil lubrication mechanical seal test device, includes the casing that both ends opening is the tube-shape and arranges, and the sealed end cover is installed to the opening part at casing both ends, and two sealed end covers enclose with the casing and form the sealed chamber that is used for seal test; one end of the main shaft is coaxially inserted into the sealing cavity; the outer ring of the main shaft is coaxially provided with a shaft sleeve which can axially slide along the main shaft and is in rotation-stopping fit with the main shaft, two groups of mechanical seals to be tested are symmetrically arranged on the shaft sleeve, static rings of the mechanical seals are pressed and fixed on corresponding seal end covers by a first locking piece, and movable rings of the mechanical seals are pressed and fixed on shaft sleeve positioning steps of the shaft sleeve by a second locking piece; the main shaft body is provided with a main shaft positioning step, and the end part of the main shaft positioned in the sealing cavity is provided with a shaft sleeve pressing piece for pressing and fixing the shaft sleeve on the main shaft positioning step.
As a further scheme of the invention: two groups of shaft sleeves are symmetrically arranged on the main shaft, correspond to two mechanical sealing positions respectively, and are in stop fit after being spliced and positioned at the butt ends of the two shaft sleeves; along keeping away from axle sleeve grafting end direction, second retaining member, axle sleeve location step and first retaining member are arranged in proper order, and first retaining member and second retaining member produce the compressive force in opposite directions to mechanical seal.
As still further aspects of the invention: the first locking piece comprises a mounting flange which is coaxially arranged with the sealing end cover, the inner side of the mounting flange is fixed on the sealing end cover through a bolt, and the outer side of the mounting flange tightly presses and fixes the step surface of the stationary ring through a bolt; an annular cavity for mechanical seal installation is arranged between the installation flange and the main shaft.
As still further aspects of the invention: the butt joint end of the shaft sleeve is axially provided with a shaft sleeve pin hole, and the shaft sleeve pin holes of the two shaft sleeves are in stop-rotation fit after being inserted with coaxial positioning pins; the shaft sleeve outer ring is provided with a shaft sleeve outer thread, after the locking nut is in threaded fit with the shaft sleeve outer thread of the shaft sleeve, the movable ring of the mechanical seal is pressed and fixed on the shaft sleeve positioning step, and the locking nut is the second locking piece.
As still further aspects of the invention: the shaft end of the main shaft positioned in the sealing cavity is coaxially provided with a main shaft second bolt hole, the shaft sleeve pressing piece is a shaft sleeve pressing plate which is coaxially arranged with the main shaft and is annular, and the shaft sleeve is pressed and fixed through the shaft sleeve pressing plate while the locking bolt is in threaded fit with the main shaft second bolt hole.
As still further aspects of the invention: a main shaft positioning cavity is axially formed in one end of the main shaft, which is far away from the sealing cavity, a main shaft first bolt hole corresponding to the main shaft positioning cavity is formed in the main shaft along the radial direction, and the motor shaft is fixed with a main shaft bolt through the main shaft first bolt hole after being inserted into the main shaft positioning cavity; the spindle is provided with a spindle positioning pin hole along the radial direction at the step surface of the spindle positioning step, and the shaft sleeve is in rotation-stopping fit with the spindle through a positioning pin in the spindle positioning pin hole.
As still further aspects of the invention: the two sealing end covers are coaxially fixed with a leakage receiving cover at one end far away from the sealing cavity, and the leakage receiving cover, the corresponding sealing end covers and the mechanical seal are enclosed to form a leakage receiving cavity.
As still further aspects of the invention: the shell outer ring is sequentially provided with an oil inlet joint, a pressure sensor joint, an oil outlet joint and a temperature sensor joint along the circumferential direction, the oil inlet joint is positioned at the bottom of the shell, the pressure sensor joint is positioned at the top of the shell, the oil outlet joint is positioned at the middle of the shell, and the temperature sensor joint is adjacently arranged with the oil outlet joint.
As still further aspects of the invention: the mechanical sealing performance testing method is characterized by comprising the following steps of:
S1, building the spent oil lubrication mechanical seal test device;
S2, closing an inlet valve and an outlet valve of a medium on the shell, monitoring the liquid level of the medium in the sealing cavity, and ensuring that the liquid level of the medium is always between the lowest limit and the highest limit;
S3, opening an inlet valve and an outlet valve of the medium on the shell to enable the medium to enter a flowing state, monitoring the pressure in the sealing cavity through the pressure sensor, monitoring the flow rate of the medium and the temperature of the medium through the flowmeter, and calculating the friction coefficient of the mechanical seal ：
；
；
；
；
Wherein n represents the rotation speed of the main shaft;
p represents the end face specific pressure of the mechanical seal;
r i represents the mechanical seal inner diameter;
r o represents the mechanical seal outer diameter;
ρ represents the density of the medium within the sealed cavity;
q v represents the flow rate of the medium in the sealed chamber;
c represents the specific heat capacity of the medium in the sealed cavity;
t represents the temperature of the medium in the sealed cavity;
T 0 represents the temperature of the medium before it enters the sealed chamber;
k represents an insufficient lubrication state stirring heat coefficient;
ω represents the rotational angular velocity of the spindle;
V represents the viscosity of the medium in the sealed cavity;
Representing the axial distance between two mechanical seal end faces;
r ai represents the average inner diameter of the sleeve;
r ao represents the average outer diameter of the sleeve.
As still further aspects of the invention: in step S2, judging whether the medium liquid level is between the lowest limit and the highest limit according to the change value of the temperature;
When the medium level is between the lowest limit and the highest limit, In time, the temperature change value of the medium in the sealing cavity is T B;
Tmin≤TB≤Tmax；
；
；
Wherein T max represents Maximum limit value of medium temperature rise in the sealed cavity in time;
T min represents Maximum limit value of medium temperature reduction in the sealed cavity in time;
r 0 represents the inside diameter of the shell;
indicating the axial distance between the back faces of the mounting flanges.
Compared with the prior art, the invention has the beneficial effects that:
1. In the test of the invention, through changing the shaft sleeves with different diameters to adapt to the size of the mechanical seal to be tested, after the mechanical seal is locked on the shaft sleeve in advance, the mechanical seal and the shaft sleeve can be integrally fixed on the main shaft, the shaft sleeve and the motor shaft are positioned through pins to transmit power to coaxially rotate, and the shaft sleeve is tightly pressed through screw thread fit under the action of the shaft sleeve pressing plate, and the mounting flange can be matched with the locking nut, so that opposite clamping force is generated on the mechanical seal, and the mechanical seal is stably fixed; when the mechanical seal is required to be disassembled, as the main shaft is in a cantilever type fixing mode, after the locking of the locking bolt to the shaft sleeve pressing plate is released, the locking nut on the mounting flange is disassembled, the shaft sleeve and the mechanical seal can be pulled out of the sealing cavity integrally, the disassembly and the assembly are quick, the simulation test of the lubricating operation conditions of the spent oil of the mechanical seal with different sizes can be realized after the shaft sleeve is replaced, and other parts are not required to be replaced.
2. According to the double-shaft sleeve design, the double-shaft sleeve can synchronously rotate after being inserted and positioned through the pins and is respectively used for installing two groups of mechanical seals, the compression fixation of the movable ring can be realized through arranging the shaft sleeve positioning step and the shaft sleeve external thread on the shaft sleeve and screwing the locking nut on the outer ring of the shaft sleeve; through the hole at the end part of the main shaft, the motor shaft is coaxially fixed with the main shaft through the bolt after being inserted, so that the motor shaft and the main shaft can be quickly fixed to transmit power.
3. According to the invention, the leakage receiving cover is arranged at the outer side of the sealing end cover, and in the test process, part of leaked medium can enter the leakage receiving cavity between the leakage receiving cover and the sealing end cover and is discharged after being collected, so that the medium is prevented from directly leaking outwards to pollute the environment; the arrangement of the joints on the shell can simulate the actual application scene, and the simulated test of the working condition of the lubricating operation of the spent oil can be realized by controlling the medium flow of the oil at the inlet and the outlet or assisting the compressed air at the joint of the pressure sensor to control the pressure.
4. According to the invention, the end face friction coefficient of the mechanical seal can be quantitatively calculated on line in real time at different lubricating degrees of the spent oil, and the monitoring and dynamic regulation and control of different lubricating states of the spent oil can be realized through the numerical detection of different sensors and the opening degree of a control valve.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of a housing according to the present invention.
Fig. 3 is a schematic structural view of a spindle according to the present invention.
Fig. 4 is a schematic structural view of a shaft sleeve according to the present invention.
In the figure:
1. a housing; 11. sealing the cavity; 12. an oil inlet joint; 13. a pressure sensor joint;
14. an oil outlet joint; 15. a temperature sensor joint;
2. a main shaft; 21. a main shaft positioning step; 22. a main shaft positioning pin hole;
23. a first bolt hole of the main shaft; 24. a spindle positioning cavity; 25. a main shaft second bolt hole;
3. mechanical sealing; 31. a stationary ring; 32. a moving ring;
4. Sealing the end cover; 41. a mounting flange; 42. a drain cover; 43. a leakage receiving cavity;
5. a shaft sleeve; 51. a shaft sleeve positioning step; 52. an external thread of the shaft sleeve; 53. a shaft sleeve pin hole;
6. a lock nut; 7. a motor shaft; 81. a sleeve pressing plate; 82. a locking bolt.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 4, in an embodiment of the invention, a test device for lubricating mechanical seal with spent oil includes a casing 1 with two ends open in a tubular shape, a seal end cover 4 is installed at the opening of the two ends of the casing 1, a cover body of the seal end cover 4 is fixed with the casing 1 by bolts, an inner ring of the seal end cover 4 extends axially into a casing cavity of the casing 1, thereby forming an annular extending end, and a seal ring is arranged between the extending end of the seal end cover 4 and the casing cavity of the casing 1.
The extending ends of the two sealing end covers 4 are fixed with a mounting flange 41 adjacent to one end of the sealing cavity 11 of the shell 1, and the mounting flange 41 is fixed on the sealing end covers 4 through bolts positioned in the sealing cavity 11. The stationary ring 31 of the mechanical seal 3 to be measured is fixed to the side of the mounting flange 41 outside the seal chamber 11 by bolts. A sealing ring is arranged at the contact surface of the mounting flange 41 and the sealing end cover 4.
The main shaft 2 passes through one group of sealing end covers 4, extends into the sealing cavity 11 of the shell 1, and is arranged in a cantilever mode. A mounting gap exists between the mounting flange 41 and the main shaft 2 for mounting the mechanical seal 3. The housing 1, the seal end cap 4, the mounting flange 41 and the mechanical seal 3 are matched with the main shaft 2, so that a seal cavity 11 is formed by enclosing.
One end of the main shaft 2 outside the sealing cavity 11 is provided with a main shaft positioning cavity 24 along the axial direction, the main shaft positioning cavity 24 corresponds to the motor shaft 7 in size, and the motor shaft 7 is inserted. The outer ring of the main shaft 2 is also uniformly provided with main shaft first bolt holes 23 communicated with a main shaft positioning cavity 24 along the radial direction, and the main shaft 2 and the motor shaft 7 are fixed through the main shaft first bolt holes 23 by bolts, so that the main shaft and the motor shaft rotate coaxially.
The main shaft 2 is a two-section stepped shaft body with thick front and thin rear, and a main shaft positioning step 21 is arranged between the thin shaft section and the thick shaft section. The sleeve 5 can be slidably fitted with the spindle 2 along a thin shaft section of the spindle 2 and finally abuts against the spindle positioning step 21. The main shaft positioning step 21 is uniformly provided with main shaft positioning pin holes 22 along the radial direction, and after the shaft sleeve 5 is pressed and fixed on the main shaft positioning step 21, the shaft sleeve 5 and the main shaft 2 are in rotation-stopping fit by inserting positioning pins into the main shaft positioning pin holes 22.
The shaft sleeves 5 are generally symmetrically arranged in two groups, and the two groups of shaft sleeves 5 respectively correspond to the two groups of mechanical seals 3. The inner diameter of the shaft sleeve 5 corresponds to the outer diameter of the thin shaft section of the main shaft 2, and the outer diameter of the shaft sleeve 5 corresponds to the inner diameter of the mechanical seal 3, so that different shaft sleeves 5 can be replaced for testing the mechanical seal 3 with different sizes.
The end of the two shaft sleeves 5 in the sealing cavity 11 is a butt joint end, the butt joint end of the shaft sleeves 5 is provided with a shaft sleeve pin hole 53 along the axial direction, and the positioning pins are inserted into the shaft sleeve pin holes 53, so that the two groups of shaft sleeves 5 can be in anti-rotation fit after being inserted and positioned and synchronously rotate along with the main shaft 2.
The outer ring of the shaft sleeve 5 is sequentially provided with shaft sleeve external threads 52 and shaft sleeve positioning steps 51 along the direction away from the butt joint end. After the movable ring 32 of the mechanical seal 3 is sleeved on the outer ring of the shaft sleeve 5, the movable ring 32 of the mechanical seal 3 can be pressed and fixed on the shaft sleeve positioning step 51 by installing the locking nut 6 on the outer ring of the shaft sleeve 5 and simultaneously matching the locking nut 6 with the external thread 52 of the shaft sleeve in a threaded manner. The lock nut 6 applies a pressing force to the movable ring 32 in a direction away from the butt joint end of the shaft sleeve 5, the bolt on the mounting flange 41 applies a pressing force to the stationary ring 31 in a direction towards the butt joint end of the shaft sleeve 5, and the mechanical seal 3 is pressed and fixed on the corresponding shaft sleeve 5 under bidirectional fit, so that the mechanical seal 3 and the corresponding shaft sleeve 5 are integrally arranged and can be integrally mounted or dismounted with the shaft sleeve 5.
Annular grooves are formed in the inner rings of the two shaft sleeves 5 and are used for installing sealing rings, so that the main shaft 2 is in sealing fit with the two shaft sleeves 5. In order to reduce friction, the inner ring of the shaft sleeve 5 can be provided with antifriction clearance grooves, and the diameter of the antifriction clearance grooves is slightly larger than that of the main shaft 2 at the same position by 2-5 mm. The length of the thin shaft section of the main shaft 2 is preferably larger than the total length of the two shaft sleeves 5 after being butted, and the length difference is preferably 1-3 mm so as to facilitate the subsequent compaction and fixation.
In order to realize the compression fixation of the shaft sleeve 5, one end of the main shaft 2 positioned in the sealing cavity 11 is provided with a main shaft second bolt hole 25 along the axial direction, and a locking bolt 82 is arranged in the main shaft second bolt hole 25. The locking bolt 82 is coaxially provided with an annular shaft sleeve pressing plate 81, and when the locking bolt 82 is screwed, the shaft sleeve pressing plate 81 moves towards the motor shaft 7, so that a pressing force is applied to the shaft sleeve 5, and the two shaft sleeves 5 are pressed on the main shaft positioning step 21 while being fixedly inserted and pressed, and synchronously rotate along with the main shaft 2.
The end of the sealing end cover 4 far away from the sealing cavity 11 is also coaxially fixed with a leakage receiving cover 42 through a bolt, and a hole is formed in the center of the leakage receiving cover 42 adjacent to one end of the motor shaft 7 so as to allow the spindle 2 to pass through, and the leakage receiving cover 42 far away from one end of the motor shaft 7 is a closed cover body. The leakage receiving cover 42, the sealing end cover 4 and the mechanical seal 3 are enclosed to form a leakage receiving cavity 43 for receiving the leaked medium in the sealing cavity 11. The bottom of the drain cover 42 may be provided with a diversion hole to direct the medium outwardly.
An oil inlet joint 12, a pressure sensor joint 13, an oil outlet joint 14 and a temperature sensor joint 15 are circumferentially arranged on the outer ring of the shell 1, the oil inlet joint 12 is positioned at the bottom of the shell 1, the pressure sensor joint 13 is positioned at the top of the shell 1, the oil outlet joint 14 is positioned in the middle of the shell 1, the temperature sensor joint 15 is adjacently arranged with the oil outlet joint 14, and the included angle between the temperature sensor joint 15 and the oil outlet joint 14 is preferably 15-25 degrees.
When performance test is carried out on the spent oil lubrication mechanical seal test device, the test method comprises the following steps:
S1, constructing a spent oil lubrication mechanical seal test device;
S2, closing an inlet valve and an outlet valve of a medium on the shell 1, monitoring the liquid level of the medium in the sealing cavity 11, and ensuring that the liquid level of the medium is always between the lowest limit and the highest limit;
Judging whether the medium liquid level is between the lowest limit and the highest limit according to the change value of the temperature;
When the medium level is between the lowest limit and the highest limit, In the time, the temperature change value of the medium in the sealing cavity 11 is T B;
Tmin≤TB≤Tmax；
T max represents Maximum limit of medium temperature rise in the sealed chamber 11 over time;
T min represents Maximum limit of the decrease in temperature of the medium in the sealed chamber 11 over time;
；
。
S3, opening an inlet valve and an outlet valve of the medium on the shell 1 to enable the medium to enter a flowing state, monitoring the pressure in the sealing cavity 11 through a pressure sensor, monitoring the flow rate of the medium and the temperature of the medium through a flowmeter, and calculating the friction coefficient of the mechanical seal 3 ：
；
；
；
；
Wherein n represents the rotational speed of the spindle 2;
p represents the end face specific pressure of the mechanical seal 3;
r i represents the inner diameter of the mechanical seal 3;
r o represents the outer diameter of the mechanical seal 3;
ρ represents the density of the medium in the sealed cavity 11;
q v represents the flow rate of the medium in the sealed chamber 11;
c represents the specific heat capacity of the medium in the sealed chamber 11;
t represents the temperature of the medium in the sealed chamber 11;
T 0 represents the temperature of the medium before it enters the sealed chamber 11;
k represents an insufficient lubrication state stirring heat coefficient;
ω represents the rotational angular velocity of the spindle 2;
v represents the viscosity of the medium in the sealed chamber 11;
representing the axial distance between the end faces of the two mechanical seals 3;
r ai represents the average inner diameter of the sleeve 5;
r ao represents the average outer diameter of the sleeve 5;
R 0 represents the inner diameter of the shell 1;
showing the axial distance between the rear faces of the mounting flanges 41.
The basic principles of the present application have been described above in connection with specific embodiments, but it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be construed as necessarily possessed by the various embodiments of the application. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the application is not necessarily limited to practice with the above described specific details.
The block diagrams of the devices, apparatuses, devices, systems referred to in the present application are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.
Claims (6)
1. The mechanical sealing performance testing method is characterized by comprising the following steps of:
S1, building a spent oil lubrication mechanical seal test device, which comprises a shell (1) with two ends open in a cylindrical shape, wherein sealing end covers (4) are arranged at the openings at the two ends of the shell (1), and the two sealing end covers (4) and the shell (1) are enclosed to form a sealing cavity (11) for sealing test; one end of the main shaft (2) is coaxially inserted into the sealing cavity (11); the outer ring of the main shaft (2) is coaxially provided with a shaft sleeve (5) which can axially slide along the main shaft (2) and is in anti-rotation fit with the main shaft (2), two groups of mechanical seals (3) to be tested are symmetrically arranged on the shaft sleeve (5), a static ring (31) of the mechanical seal (3) is pressed and fixed on a corresponding sealing end cover (4) by a first locking piece, and a movable ring (32) of the mechanical seal (3) is pressed and fixed on a shaft sleeve positioning step (51) of the shaft sleeve (5) by a second locking piece; the spindle (2) body is provided with a spindle positioning step (21), and the end part of the spindle (2) positioned in the sealing cavity (11) is provided with a spindle sleeve pressing piece for pressing and fixing the spindle sleeve (5) on the spindle positioning step (21);
two groups of shaft sleeves (5) are symmetrically arranged on the main shaft (2), the two groups of shaft sleeves (5) correspond to the positions of the two mechanical seals (3) respectively, and the butt ends of the two shaft sleeves (5) are in stop fit after being inserted and positioned; along the direction away from the inserting end of the shaft sleeve (5), the second locking piece, the shaft sleeve positioning step (51) and the first locking piece are sequentially arranged, and the first locking piece and the second locking piece generate opposite pressing force on the mechanical seal (3);
The first locking piece comprises a mounting flange (41) which is coaxially arranged with the sealing end cover (4), the inner side of the mounting flange (41) is fixed on the sealing end cover (4) through bolts, and the outer side of the mounting flange (41) is used for pressing and fixing the step surface of the stationary ring (31) through bolts; an annular cavity for installing the mechanical seal (3) is arranged between the installation flange (41) and the main shaft (2);
The butt joint end of the shaft sleeve (5) is provided with a shaft sleeve pin hole (53) along the axial direction, and the shaft sleeve pin holes (53) of the two shaft sleeves (5) are in stop-rotation fit after being inserted with coaxial positioning pins; the outer ring of the shaft sleeve (5) is provided with a shaft sleeve external thread (52), after the locking nut (6) is in threaded fit with the shaft sleeve external thread (52) of the shaft sleeve (5), the movable ring (32) of the mechanical seal (3) is tightly pressed and fixed on the shaft sleeve positioning step (51), and the locking nut (6) is a second locking piece;
S2, closing an inlet valve and an outlet valve of a medium on the shell (1), monitoring the liquid level of the medium in the sealing cavity (11), and ensuring that the liquid level of the medium is always between the lowest limit and the highest limit;
s3, opening an inlet valve and an outlet valve of a medium on the shell (1) to enable the medium to enter a flowing state, monitoring the pressure in the sealing cavity (11) through a pressure sensor, monitoring the flow rate and the temperature of the medium through a flowmeter, and calculating the friction coefficient of the mechanical seal (3) ：
；
；
；
；
Wherein n represents the rotational speed of the spindle (2);
p represents the end face specific pressure of the mechanical seal (3);
r i represents the inner diameter of the mechanical seal (3);
r o represents the outer diameter of the mechanical seal (3);
ρ represents the density of the medium in the sealed cavity (11);
q v represents the flow rate of the medium in the sealed chamber (11);
c represents the specific heat capacity of the medium in the sealed cavity (11);
t represents the temperature of the medium in the sealed cavity (11);
t 0 represents the temperature of the medium before it enters the sealed chamber (11);
k represents an insufficient lubrication state stirring heat coefficient;
w represents the rotational angular velocity of the spindle (2);
V represents the viscosity of the medium in the sealed cavity (11);
Represents the axial distance between the end faces of the two mechanical seals (3);
r ai represents the average inner diameter of the sleeve (5);
r ao represents the average outer diameter of the sleeve (5).
2. The method according to claim 1, wherein in step S2, it is determined whether the medium level is between the lowest limit and the highest limit according to the temperature change value;
When the medium level is between the lowest limit and the highest limit, In the time, the temperature change value of the medium in the sealing cavity (11) is T B;
Tmin≤TB≤Tmax；
；
；
Wherein T max represents A maximum limit value of the temperature rise of the medium in the sealed cavity (11) in time;
T min represents A maximum limit value of the temperature decrease of the medium in the sealed cavity (11) in time;
R 0 represents the inner diameter of the shell (1);
Representing the axial distance between the rear faces of the two mounting flanges (41).
3. The mechanical sealing performance testing method according to claim 1 or 2, characterized in that a main shaft second bolt hole (25) is coaxially formed in the shaft end of the main shaft (2) located in the sealing cavity (11), the shaft sleeve pressing piece is a shaft sleeve pressing plate (81) which is coaxially arranged with the main shaft (2) and is annular, and the shaft sleeve (5) is pressed and fixed through the shaft sleeve pressing plate (81) while the locking bolt (82) is in threaded fit with the main shaft second bolt hole (25).
4. A mechanical sealing performance testing method according to claim 3, characterized in that a main shaft positioning cavity (24) is axially formed at one end of the main shaft (2) far away from the sealing cavity (11), a main shaft first bolt hole (23) corresponding to the main shaft positioning cavity (24) is radially formed on the main shaft (2), and a motor shaft (7) is fixed with a main shaft (2) bolt through the main shaft first bolt hole (23) after being inserted into the main shaft positioning cavity (24); the spindle (2) is provided with a spindle positioning pin hole (22) along the radial direction at the step surface of the spindle positioning step (21), and the shaft sleeve (5) is in rotation-stopping fit with the spindle (2) through a positioning pin in the spindle positioning pin hole (22).
5. The mechanical sealing performance testing method according to claim 1 or 2, wherein one end, far away from the sealing cavity (11), of each sealing end cover (4) is coaxially fixed with a leakage receiving cover (42), and the leakage receiving covers (42) are enclosed with the corresponding sealing end covers (4) and the mechanical seal (3) to form a leakage receiving cavity (43).
6. The mechanical sealing performance testing method according to claim 1 or 2, wherein an oil inlet joint (12), a pressure sensor joint (13), an oil outlet joint (14) and a temperature sensor joint (15) are sequentially formed in the outer ring of the shell (1) along the circumferential direction, the oil inlet joint (12) is located at the bottom of the shell (1), the pressure sensor joint (13) is located at the top of the shell (1), the oil outlet joint (14) is located in the middle of the shell (1), and the temperature sensor joint (15) is adjacently arranged with the oil outlet joint (14).
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| CN104330223A (en) * | 2014-11-26 | 2015-02-04 | 南京林业大学 | Mechanical sealing property testing device and method for measuring axial force and temperature of sealed end surfaces |
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| CN101532498B (en) * | 2009-04-14 | 2012-10-03 | 苏瑞益 | Mechanical seal of multilayer sludge pump |
| CN103267613B (en) * | 2013-05-06 | 2015-08-19 | 南京林业大学 | A kind of mechanical sealing performance tester |
| CN204153154U (en) * | 2014-09-03 | 2015-02-11 | 上海乐合流体机械有限公司 | Refractory machinery seals device |
| CN114674739A (en) * | 2022-03-17 | 2022-06-28 | 浙江工业大学 | Closing force adjustable friction coefficient testing device for mechanical seal under simulated working condition |
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|---|---|---|---|---|
| CN1825083A (en) * | 2006-03-27 | 2006-08-30 | 南京化工职业技术学院 | Multi-parameter controllable high-rotating speed mechanical sealing performance tester |
| CN104330223A (en) * | 2014-11-26 | 2015-02-04 | 南京林业大学 | Mechanical sealing property testing device and method for measuring axial force and temperature of sealed end surfaces |
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