CN118362497B - Double-support type mechanical seal test device and mechanical seal performance test method - Google Patents
Double-support type mechanical seal test device and mechanical seal performance test method Download PDFInfo
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- CN118362497B CN118362497B CN202410790279.1A CN202410790279A CN118362497B CN 118362497 B CN118362497 B CN 118362497B CN 202410790279 A CN202410790279 A CN 202410790279A CN 118362497 B CN118362497 B CN 118362497B
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- 238000012360 testing method Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims description 8
- 238000011056 performance test Methods 0.000 title description 6
- 238000007789 sealing Methods 0.000 claims abstract description 88
- 230000007704 transition Effects 0.000 claims abstract description 27
- 238000002955 isolation Methods 0.000 claims description 31
- 238000005192 partition Methods 0.000 claims description 16
- 238000009434 installation Methods 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 8
- 239000004519 grease Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 4
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 description 5
- 230000004323 axial length Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 210000002445 nipple Anatomy 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
Classifications
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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
-
- 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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- General Engineering & Computer Science (AREA)
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- Health & Medical Sciences (AREA)
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- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Mechanical Sealing (AREA)
Abstract
The invention relates to the field of mechanical seal testing, in particular to a double-support type mechanical seal testing device and a mechanical seal performance testing method. The test device comprises a shell with two ends open in a cylindrical shape, wherein end covers are arranged at the openings at the two ends of the shell, and the two end covers and the shell are enclosed to form a sealing cavity for sealing test; the main shaft axially penetrates through the sealing cavity along the shell; the main shaft is provided with a shaft shoulder, two groups of sealing shaft sleeves are sleeved on the outer ring of the main shaft and respectively abutted with two ends of the shaft shoulder of the main shaft, the two end covers and the two sealing shaft sleeves are provided with positioning steps, and the end covers are matched with the sealing shaft sleeves so as to clamp and fix the mechanical seal through the positioning steps; bearing seats for fixing the bearings are further arranged outside the two end covers, a transition shaft sleeve for positioning the bearings is further sleeved outside the main shaft, and the bearings are tightly pressed and fixed on the transition shaft sleeve. The invention can realize the test of mechanical seals with different sizes under the working condition of high rotation speed and high temperature, and is rapid to assemble and disassemble.
Description
Technical Field
The invention relates to the field of mechanical seal testing, in particular to a double-support type 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 order to avoid the shutdown and maintenance of the host equipment caused by faults after the mechanical seal is installed on the host equipment, static pressure, operation and service life evaluation tests are required to be carried out on the mechanical seal before the mechanical seal is installed so as to verify the performance of the mechanical seal.
The existing mechanical seal test device is described in patent number CN216669161U, the operation working condition is mainly an all-medium lubrication working condition, the rotating speed is lower and is less than 6000 r/min, and the stability and precision requirements on the test device are low. However, in the fields of aviation and the like, the mechanical seal operation working condition is high rotation speed (generally more than 10000 r/min), and the mechanical seal simulation test device is also in face of high-temperature operation working condition, the existing mechanical seal simulation test device is insufficient in stability and long-period operation performance, the test device is only suitable for mechanical seals with certain specific size, 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 very inconvenient, and the time period is long, so the problem needs to be solved.
Disclosure of Invention
In order to avoid and overcome the technical problems in the prior art, the invention provides a double-support type mechanical seal test device. The invention can realize the test of mechanical seals with different sizes under the working condition of high rotation speed and high temperature, and is rapid to assemble and disassemble. The invention also provides a mechanical sealing performance test method.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The double-support type mechanical seal test device comprises a shell with two ends open in a cylindrical shape, wherein end covers are arranged at the openings at the two ends of the shell, and the two end covers and the shell are enclosed to form a seal cavity for seal test; the main shaft axially penetrates through the sealing cavity along the shell; the main shaft is provided with a shaft shoulder, two groups of sealing shaft sleeves are sleeved on the outer ring of the main shaft and respectively abutted with two ends of the shaft shoulder of the main shaft, the two end covers and the two sealing shaft sleeves are provided with positioning steps, and the end covers are matched with the sealing shaft sleeves so as to clamp and fix the mechanical seal through the positioning steps; bearing seats for fixing the bearings are further arranged outside the two end covers, a transition shaft sleeve for positioning the bearings is further sleeved outside the main shaft, and the bearings are tightly pressed and fixed on the transition shaft sleeve.
As a further scheme of the invention: the transition shaft sleeve outer ring and the bearing seat inner ring are respectively provided with a step surface for compressing and fixing the bearing, the step surface of the transition shaft sleeve outer ring is abutted with the bearing inner ring, the step surface of the bearing seat inner ring is abutted with the bearing outer ring, the main shaft is provided with a shaft sleeve locking nut matched with the main shaft in a threaded manner, and the transition shaft sleeve is locked and fixed on the sealing shaft sleeve by the shaft sleeve locking nut.
As still further aspects of the invention: the mechanical seal comprises a matched seal and a test seal, the matched seal is arranged at the power end of the main shaft, and the test seal is arranged at the free end of the main shaft; the free end of the main shaft is sequentially provided with a sealing shaft sleeve, a transition shaft sleeve and at least two groups of adjusting shaft sleeves along the direction far away from the shaft shoulder of the main shaft, and each adjusting shaft sleeve, each transition shaft sleeve and each sealing shaft sleeve are sequentially abutted and locked and fixed on the shaft shoulder of the main shaft by a shaft sleeve locking nut.
As still further aspects of the invention: the bearing seat inner ring is convexly provided with an annular partition step, the main shaft corresponds to the central hole of the partition step in size and penetrates through the center of the partition step, the bearing is arranged on one side of the partition step, which is far away from the mechanical seal, and an isolation baffle is fixed on one side of the bearing seat, which is adjacent to the mechanical seal, of the partition step; the isolation baffle, the bearing seat, the end cover and the mechanical seal enclose to form an inner isolation cavity for containing leakage medium, and the isolation baffle, the bearing seat and the partition step enclose to form an outer isolation cavity for containing leaked lubricating grease.
As still further aspects of the invention: the bearing cap is installed to the one end that the bearing frame was kept away from mechanical seal, and the bearing cap encloses with the bearing frame and cuts off the step and forms the installation cavity, and bearing, axle sleeve lock nut and adjustment axle sleeve all are located the installation cavity.
As still further aspects of the invention: the bearing seat is provided with a ring-shaped positioning groove which is matched with the isolation baffle in a clamping way, the bottom of the outer isolation cavity of the bearing seat is provided with a lubricating grease leakage hole, and the bottom of the inner isolation cavity of the bearing seat is provided with a medium leakage hole.
As still further aspects of the invention: the end cover also comprises an adjusting flange for pressing the static ring, the adjusting flange is arranged between the end cover and the bearing seat, and the end cover, the adjusting flange and the bearing seat are fixed through bolts; the static ring of the mechanical seal is fixed by bolts after being abutted against the adjusting flange.
As still further aspects of the invention: the movable ring of the mechanical seal is abutted with the step surface of the sealing shaft sleeve, the outer ring of the sealing shaft sleeve is provided with external threads, and the sealing lock nut is in threaded fit with the sealing shaft sleeve so as to tightly press and fix the movable ring of the mechanical seal.
As still further aspects of the invention: the shell is provided with a medium inlet joint, a medium outlet joint, a temperature sensor joint and a pressure sensor joint.
A mechanical sealing performance test method comprises the following steps:
s1, building the double-support mechanical seal test device;
S2, injecting a medium into the sealing cavity until the medium reaches a set liquid level, and driving the main shaft to reach a set rotating speed;
S3, detecting parameter information in the running process of the test device through a sensor arranged on the shell, and calculating the friction coefficient of the mechanical seal 7 ：
；
Wherein, ；
；；
；
Representing the density of the medium in the sealed chamber (11);
representing the flow of medium in the sealed chamber (11);
represents the specific heat capacity of the medium in the sealed cavity (11);
Indicating the temperature of the medium in the sealed chamber (11);
representing the temperature of the medium before it enters the sealed chamber (11);
Represents the inner diameter of the sealing sleeve (61);
represents the average outer diameter of the sealing sleeve (61);
Representing the distance from the sealing end surface of the mechanical seal (7) to the shoulder contact surface of the main shaft (6);
Represents the rotational angular velocity of the spindle (6);
Represents the viscosity of the medium in the sealed cavity (11);
represents the maximum outer diameter of the spindle (6);
representing the length of the largest outer diameter section of the spindle (6);
Represents the inner diameter of the mechanical seal (7);
Represents the outer diameter of the mechanical seal (7);
An initial elastic force of a spring in the mechanical seal (7);
Representing the pressure of the fluid medium in the sealed chamber (11);
represents the atmospheric pressure outside the sealed chamber (11);
Representing the effective area of the fluid medium in the seal cavity (11) acting on the mechanical seal stationary ring (71) and the moving ring (72);
The effective area of the mechanical seal stationary ring (71) and the moving ring (72) acted by the atmospheric pressure is shown.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the dual-bearing supporting structure is symmetrically arranged outside the sealing cavity, so that the radial runout precision of the main shaft can be ensured, the influence of high-temperature medium on the shaft can be avoided during high-temperature operation, the service life of the bearing and the stability of the test device are greatly improved, the mechanical sealing performance test under the high-speed and high-temperature operation conditions is satisfied, the use scene in the aviation field is adapted, and the disassembly and the assembly are convenient.
2. According to the invention, the mechanical seal test with different axial dimensions can be adapted by changing the installation position of the adjusting shaft sleeve on the main shaft and changing the size of the adjusting flange, so that the compatibility is strong, the structure of the test device is not required to be redesigned, the structural components are simple, the number is small, and the functionality is strong.
3. When the sealing device is installed, the static ring matched with the seal and the test seal is installed on the two groups of adjusting flanges through the connecting bolts, and the movable ring is locked on the corresponding sealing shaft sleeve through the sealing locking nut. After the main shaft passes through the sealing cavity, two groups of sealing shaft sleeves are arranged on the main shaft to be abutted with the shaft shoulder of the main shaft, and the mechanical seal is arranged. And then two groups of bearings are arranged on the mounting surface of the outer ring of the bearing in the bearing seat, two groups of isolation baffles are arranged in the positioning grooves of the bearing seat, and two groups of transition shaft sleeves and the adjusting shaft sleeve at the free end of the main shaft are arranged. The matched seal is positioned, the shaft sleeve of the power end of the main shaft is locked and fixed through the shaft sleeve locking nut, the bearing cover at the power end side of the main shaft is fixed, and the bearing cover is tightly pressed on the bearing seat of the power end through the fastening bolt and the gasket. And then the test seal is positioned, the adjusting shaft sleeve penetrates through the free end of the main shaft, and the adjusting shaft sleeve, the corresponding transition shaft sleeve and the corresponding sealing shaft sleeve are locked and fixed through the shaft sleeve locking nut at the free end, so that the overall installation and the disassembly operation are simpler, more convenient, time-saving and labor-saving.
4. According to the invention, under a steady state operation state, the end face friction coefficient of the mechanical seal can be determined by combining the numerical value of the seal cavity temperature sensor with the operation parameters of the test device and the parameters of the fluid medium, and the influence analysis of different spring forces and medium pressures under the same end face specific pressure on the sealing performance can be realized by utilizing the compression amount adjustment of the seal spring according to the actual friction coefficient.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure:
1. a housing; 11. sealing the cavity;
2. An end cap; 3. adjusting the flange;
4. a bearing seat; 41. an isolation baffle; 42. an inner isolation chamber; 421. a medium leakage hole;
43. An outer isolation chamber; 431. a grease leakage hole; 44. partition steps; 45. a bearing;
5. A bearing cap; 6. a main shaft; 61. sealing the shaft sleeve; 62. sealing the lock nut;
63. A transition shaft sleeve; 64. adjusting the shaft sleeve; 65. a shaft sleeve lock nut;
7. Mechanical sealing; 71. a stationary ring; 72. a moving ring.
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, in the embodiment of the invention, a dual-support mechanical seal testing device includes a casing 1, where the casing 1 is cylindrical, two ends of the casing are open, two ends of the casing 1 are sequentially provided with an end cover 2, an adjusting flange 3, a bearing seat 4 and a bearing cover 5 along a direction far away from the opening of the casing 1, an outer ring of the end cover 2 is axially provided with a step surface, the end cover 2 is fastened and fixed at the openings at two ends of the casing 1, and a sealing ring is arranged at a contact surface of the end cover 2 and the casing 1. The adjusting flange 3 is located between the end cap 2 and the bearing seat 4 and is adjustable in size to accommodate mechanical seals 7 of different sizes.
The bearing seat 4, the adjusting flange 3 and the end cover 2 are fixed through bolts, wherein sealing rings are arranged at the contact surfaces of the adjusting bolts 3, the end cover 2 and the bearing seat 4.
The main shaft 6 is axially provided with two bearing seats 4 along the shell 1, two sections of shaft shoulders are processed on the main shaft 6 and are used for installing the sealing shaft sleeves 61, and the two groups of sealing shaft sleeves 61 are abutted with the shaft shoulders of the main shaft 6.
The sealing shaft sleeve 61 is sequentially provided with two groups of step surfaces with gradually increased diameters along the direction close to the shaft shoulder of the main shaft 6, the step surface of the large-diameter section is used for installing the mechanical seal 7, and the step surface of the small-diameter section is used for installing the sealing lock nut 62.
When the mechanical seal 7 is mounted, the stationary ring 71 of the mechanical seal 7 is abutted against the adjustment flange 3, and is fixedly connected with the adjustment flange 3 by a flange connecting bolt. The movable ring 72 of the mechanical seal 7 is abutted against the step surface of the large-diameter section of the seal shaft sleeve 61, after the mechanical seal 7 is installed, the seal lock nut 62 is installed on the small step surface of the seal shaft sleeve 61, and the seal shaft sleeve 61 is pressed and fixed on the shaft shoulder of the main shaft 6 through the threaded fit of the seal lock nut 62 and the seal shaft sleeve 61.
A seal ring is mounted at the contact surface of the seal sleeve 61 and the main shaft 6, and a seal ring is also mounted at the contact surface of the seal sleeve 61 and the movable ring 72. The shell 1 is provided with a medium inlet joint, a medium outlet joint and sensor joints such as temperature, pressure, liquid level and the like.
After the sealing shaft sleeve 61 is installed, the sealing cavity 11 is formed by enclosing the adjusting flange 3, the mechanical seal 7, the sealing shaft sleeve 61, the end cover 2 and the shell 1, and the sealing cavity 11 is used for injecting a medium for sealing test. The two sets of mechanical seals 7 are respectively matched with seals and test seals, the matched seals are arranged at the power ends of the adjacent spindles 6, and the test seals are arranged at the free ends of the adjacent spindles 6.
The inner ring of the bearing seat 4 is provided with a partition step 44 in a protruding way along the radial direction, a bearing 45 is arranged on one side of the partition step 44 away from the shaft shoulder of the main shaft 6 in the bearing seat 4, and an isolation baffle 41 is arranged on one side of the partition step 44 adjacent to the shaft shoulder of the main shaft 6 in the bearing seat 4. The isolation baffle 41 can be clamped and fixed with the bearing seat 4 by forming a positioning groove in the bearing seat 4.
The isolation baffle 41, the isolation step 44 and the bearing seat 4 are enclosed to form an outer isolation cavity 43, and the bearing seat 4 is provided with a grease leakage hole 431 at the bottom of the outer isolation cavity 43 for discharging the grease leakage of the bearing 45. The isolation baffle 41, the mechanical seal 7 and the bearing seat 4 are enclosed to form an inner isolation cavity 42, and the bearing seat 4 is provided with a medium leakage hole 421 at the bottom of the inner isolation cavity 42 for discharging leaked medium outwards.
Grease leakage holes 431 and medium leakage holes 421 may be provided with a nipple and a nipple, respectively, for finding and metering a leaking medium. Because the bearing 45 is positioned outside the sealing cavity 11 and is not in direct contact with the high-temperature oil medium inside, the working environment of the bearing 45 under the high-temperature working condition can be improved, and the service life of the test device can be prolonged.
The outer ring of the main shaft 6 is axially provided with a transition shaft sleeve 63, the outer ring of the transition shaft sleeve 63 is provided with a positioning step, and the inner ring of the bearing 45 is abutted with the positioning step of the outer ring of the transition shaft sleeve 63. The transition shaft sleeve 63 at the power end of the main shaft 6 is directly locked and fixed by the shaft sleeve locking nut 65 through the threaded fit of the shaft sleeve locking nut 65 and the main shaft 6. At least two groups of adjusting shaft sleeves 64 are further arranged at the free end of the main shaft 6 in the direction away from the transition shaft sleeve 63, a shaft sleeve locking nut 65 in threaded fit with the main shaft 6 is arranged at the end of the free end of the main shaft 6, and the shaft sleeve locking nut 65 tightly fixes the adjusting shaft sleeve 64, the transition shaft sleeve 63 and the sealing shaft sleeve 61 on the shaft shoulder of the main shaft 6.
Taking three mechanical seals 7 with different sizes as an example, the axial sizes of the three mechanical seals 7 are respectively a, b and c. The adjustment sleeves 64 are arranged in two groups, the axial length of the first adjustment sleeve is set to a-b, and the axial length of the first adjustment sleeve is set to b-c. When the mechanical seal 7 is tested, the installation positions of the first adjusting shaft sleeve and the second adjusting shaft sleeve on the main shaft 6 are adjusted, and the size of the adjusting flange 3 corresponding to the free end of the main shaft 6 is adjusted, so that the size of the mechanical seal 7 can be adapted.
After the test of the c-type mechanical seal 7 is completed, when the b-type mechanical seal 7 is replaced to carry out the test, the first adjusting shaft sleeve with the axial length of b-c is placed between the sealing shaft sleeve 61 and the shaft shoulder of the main shaft 6, and the size of the adjusting flange 3 is replaced to be b-c. Similarly, when the test is performed by replacing the a-type mechanical seal 7, the first adjusting sleeve and the second adjusting sleeve are both installed between the sealing sleeve 61 and the shoulder of the main shaft 6, and the size of the adjusting flange 3 is replaced so that the thickness thereof is a-c. In addition, for the different sizes of the movable ring 72 of the mechanical seal 7, a shaft sleeve with proper size can be added between the step surfaces of the sealing lock nut 62 and the sealing shaft sleeve 61, and then the movable ring 72 is locked by the sealing lock nut 62, so that independent adaptation of the sizes of the different movable rings 72 is realized.
The bearing housing 4 is kept away from one side of mechanical seal 7 and installs bearing cap 5, and bearing cap 5 encloses with bearing housing 4 and closes and form the bearing chamber, and shaft sleeve lock nut 65 on main shaft 6 free end and the power end all is located the bearing intracavity, and bearing cap 5 passes through countersunk head screw and is connected fixedly with bearing housing 4. The power end of the main shaft 6 is coaxially fixed with the motor shaft after passing through the bearing cover 5 along the axial direction, and is preferably connected by a key to realize the rotation-stopping fit. When the mechanical seal 7 is disassembled, the bearing cover 5 at the free end of the adjacent main shaft 6 is disassembled, the corresponding shaft sleeve locking nuts 65 are loosened, the adjusting shaft sleeves 64 are pulled out, the integrated disassembly of the bearing seat 4 and the bearing 45 can be realized, the installation part of the mechanical seal 7 is rapidly exposed, the disassembly and the inspection are simple, and the rapid replacement can be realized.
During installation, the stationary ring 71 which is used as a seal and a test seal is mounted on the two sets of adjusting flanges by connecting bolts, and the movable ring 72 is locked on the corresponding sealing shaft sleeve 61 by the sealing lock nut 62. After the main shaft 6 passes through the sealing cavity 11, two groups of sealing shaft sleeves 61 are installed on the main shaft 6 to be abutted with the shaft shoulders of the main shaft 6, and the installation of the mechanical seal 7 is completed. Two groups of bearings 45 are arranged on the mounting surface of the outer ring of the bearing in the bearing seat 4, two groups of isolation baffles 41 are arranged in the positioning grooves of the bearing seat 4, and two groups of transition shaft sleeves 63 and adjusting shaft sleeves 64 at the free end of the main shaft 6 are arranged. The matched seal is positioned, the shaft sleeve of the power end of the main shaft 6 is locked and fixed through the shaft sleeve locking nut 65, the bearing cover 5 at the power end side of the main shaft 6 is fixed, and the bearing cover is pressed on the bearing seat 4 of the power end through the fastening bolt and the gasket. And positioning the test seal, passing the adjusting shaft sleeve 64 through the free end of the main shaft 6, and locking and fixing the adjusting shaft sleeve 64, the corresponding transition shaft sleeve 63 and the sealing shaft sleeve 61 through the shaft sleeve locking nut 65 at the free end. The bearing cap 5 at the free end side of the main shaft 6 is fixed after locking and is pressed on the bearing seat 4 at the free end through a fastening bolt and a gasket. Finally, the shaft head with a key groove at the power end of the main shaft 6 of the coupler is connected with the motor shaft head, and the corresponding oil inlet and outlet pipe and the measuring sensor are connected according to the oil inlet and outlet holes on the sealing cavity 11 and the measuring instrument probe hole.
The sealing performance test method of the mechanical seal 7 comprises the following steps:
s1, building a double-support mechanical seal test device;
s2, injecting a medium into the sealing cavity 11 until the medium reaches a set liquid level, and driving the main shaft 6 to reach a set rotating speed;
S3, detecting parameter information in the running process of the test device through a sensor arranged on the shell 1, and calculating the friction coefficient of the mechanical seal 7 ；
；
Wherein, ；
；；
；
Representing the density of the medium in the sealed chamber (11);
representing the flow of medium in the sealed chamber (11);
represents the specific heat capacity of the medium in the sealed cavity (11);
Indicating the temperature of the medium in the sealed chamber (11);
representing the temperature of the medium before it enters the sealed chamber (11);
Represents the inner diameter of the sealing sleeve (61);
represents the average outer diameter of the sealing sleeve (61);
Representing the distance from the sealing end surface of the mechanical seal (7) to the shoulder contact surface of the main shaft (6);
Represents the rotational angular velocity of the spindle (6);
Represents the viscosity of the medium in the sealed cavity (11);
represents the maximum outer diameter of the spindle (6);
representing the length of the largest outer diameter section of the spindle (6);
Represents the inner diameter of the mechanical seal (7);
Represents the outer diameter of the mechanical seal (7);
An initial elastic force of a spring in the mechanical seal (7);
Representing the pressure of the fluid medium in the sealed chamber (11);
represents the atmospheric pressure outside the sealed chamber (11);
Representing the effective area of the fluid medium in the seal cavity (11) acting on the mechanical seal stationary ring (71) and the moving ring (72);
The effective area of the mechanical seal stationary ring (71) and the moving ring (72) acted by the atmospheric pressure is shown.
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 (9)
1. The double-support type mechanical seal test device is characterized by comprising a shell (1), wherein the shell (1) is cylindrical, two ends of the shell are open, an end cover (2), an adjusting flange (3), a bearing seat (4) and a bearing cover (5) are sequentially arranged at two ends of the shell (1) along the direction away from the opening of the shell (1), a step surface is axially arranged on the outer ring of the end cover (2), the end cover (2) is buckled and fixed at the openings at two ends of the shell (1), and a sealing ring is arranged at the contact surface of the end cover (2) and the shell (1); the adjusting flange (3) is positioned between the end cover (2) and the bearing seat (4); the main shaft (6) is axially provided with two bearing seats (4) along the shell (1), two sections of shaft shoulders are processed on the main shaft (6) and are used for installing the sealing shaft sleeve (61), and the two groups of sealing shaft sleeves (61) are sleeved on the outer ring of the main shaft and respectively abutted with the two sections of shaft shoulders of the main shaft (6); after the sealing shaft sleeve (61) is installed, the flange (3), the mechanical seal (7), the sealing shaft sleeve (61), the end cover (2) and the shell (1) are enclosed to form a sealing cavity (11); the main shaft (6) axially penetrates through the sealing cavity (11) along the shell (1); positioning steps are formed on the two end covers (2) and the two sealing shaft sleeves (61), and the positioning steps of the end covers (2) and the sealing shaft sleeves (61) are used for axially compressing a stationary ring (71) and a movable ring (72) of the mechanical seal (7) respectively; bearing seats (4) for fixing the bearings (45) are further arranged outside the two end covers (2), a transition shaft sleeve (63) for positioning the bearings (45) is sleeved outside the main shaft (6), and the bearings (45) are tightly pressed and fixed on the transition shaft sleeve (63);
The mechanical seal (7) comprises a matched seal and a test seal, the matched seal is arranged at the power end of the main shaft (6), and the test seal is arranged at the free end of the main shaft (6); the free end of the main shaft (6) is sequentially provided with a sealing shaft sleeve (61), a transition shaft sleeve (63) and at least two groups of adjusting shaft sleeves (64) along the direction away from the shaft shoulder of the main shaft (6), and each adjusting shaft sleeve (64), each transition shaft sleeve (63) and each sealing shaft sleeve (61) are sequentially abutted and locked and fixed on the shaft shoulder of the main shaft (6) by a shaft sleeve locking nut (65); the mechanical seal testing with different axial dimensions can be adapted by changing the installation position of the adjusting shaft sleeve (64) on the main shaft (6) and changing the size of the adjusting flange (3).
2. The double-support type mechanical seal test device according to claim 1, wherein the outer ring of the transition shaft sleeve (63) and the inner ring of the bearing seat (4) are provided with step surfaces for pressing and fixing the bearing (45), the step surfaces of the outer ring of the transition shaft sleeve (63) are abutted against the inner ring of the bearing (45), the step surfaces of the inner ring of the bearing seat (4) are abutted against the outer ring of the bearing (45), the spindle (6) is provided with a shaft sleeve locking nut (65) in threaded fit with the spindle (6), and the transition shaft sleeve (63) is locked and fixed on the sealing shaft sleeve (61) by the shaft sleeve locking nut (65).
3. The double-support mechanical seal test device according to claim 1 or 2, wherein an annular partition step (44) is convexly arranged on the inner ring of the bearing seat (4), the main shaft (6) corresponds to the size of a central hole of the partition step (44) and penetrates through the center of the partition step (44), the bearing (45) is arranged on one side of the partition step (44) away from the mechanical seal (7), and an isolation baffle (41) is fixed on one side of the bearing seat (4) adjacent to the mechanical seal (7) on the partition step (44); the isolation baffle (41), the bearing seat (4), the end cover (2) and the mechanical seal (7) are enclosed to form an inner isolation cavity (42) for containing leakage media, and the isolation baffle (41), the bearing seat (4) and the isolation step (44) are enclosed to form an outer isolation cavity (43) for containing leakage grease.
4. A double-support mechanical seal testing device according to claim 3, wherein the bearing cover (5) is mounted at one end of the bearing seat (4) far away from the mechanical seal (7), the bearing cover (5) forms a mounting cavity with the bearing seat (4) and the partition step (44), and the bearing (45), the shaft sleeve locking nut (65) and the adjusting shaft sleeve (64) are all positioned in the mounting cavity.
5. A double-support type mechanical seal testing device according to claim 3, wherein the bearing seat (4) is provided with a ring-shaped positioning groove, and is in clamping fit with the isolation baffle (41) through the positioning groove, the bearing seat (4) is provided with a lubricating grease leakage hole (431) at the bottom of the outer isolation cavity (43), and the bearing seat (4) is provided with a medium leakage hole (421) at the bottom of the inner isolation cavity (42).
6. A double-support mechanical seal testing device according to claim 1 or 2, wherein the end cover (2) further comprises an adjusting flange (3) for pressing the stationary ring (71), the adjusting flange (3) is arranged between the end cover (2) and the bearing seat (4), and the end cover (2), the adjusting flange (3) and the bearing seat (4) are fixed through bolts; a stationary ring (71) of the mechanical seal (7) is abutted against the adjusting flange (3) and then fixed by bolts.
7. The double-support type mechanical seal test device according to claim 6, wherein a movable ring (72) of the mechanical seal (7) is abutted against a step surface of the sealing shaft sleeve (61), an outer ring of the sealing shaft sleeve (61) is provided with external threads, and the sealing lock nut (62) is in threaded fit with the sealing shaft sleeve (61) so as to press and fix the movable ring (72) of the mechanical seal (7).
8. A double-support mechanical seal testing device according to claim 1 or 2, characterized in that the housing (1) is provided with a medium inlet connector, a medium outlet connector, a temperature sensor connector and a pressure sensor connector.
9. The mechanical sealing performance testing method is characterized by comprising the following steps of:
s1, constructing the double-support mechanical seal test device according to claim 1 or 2;
s2, injecting a medium into the sealing cavity (11) until the medium reaches a set liquid level, and driving the main shaft (6) to reach a set rotating speed;
S3, detecting parameter information in the running process of the test device through a sensor arranged on the shell (1), and calculating the friction coefficient of the mechanical seal (7) ；
；
Wherein, ；
；
；
；
Representing the density of the medium in the sealed chamber (11);
representing the flow of medium in the sealed chamber (11);
represents the specific heat capacity of the medium in the sealed cavity (11);
Indicating the temperature of the medium in the sealed chamber (11);
representing the temperature of the medium before it enters the sealed chamber (11);
Represents the inner diameter of the sealing sleeve (61);
represents the average outer diameter of the sealing sleeve (61);
Representing the distance from the sealing end surface of the mechanical seal (7) to the shoulder contact surface of the main shaft (6);
Represents the rotational angular velocity of the spindle (6);
Represents the viscosity of the medium in the sealed cavity (11);
represents the maximum outer diameter of the spindle (6);
representing the length of the largest outer diameter section of the spindle (6);
Represents the inner diameter of the mechanical seal (7);
Represents the outer diameter of the mechanical seal (7);
An initial elastic force of a spring in the mechanical seal (7);
Representing the pressure of the fluid medium in the sealed chamber (11);
represents the atmospheric pressure outside the sealed chamber (11);
Representing the effective area of the fluid medium in the seal cavity (11) acting on the mechanical seal stationary ring (71) and the moving ring (72);
The effective area of the mechanical seal stationary ring (71) and the moving ring (72) acted by the atmospheric pressure is shown.
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| CN111810643A (en) * | 2020-07-22 | 2020-10-23 | 广东博智林机器人有限公司 | Axial sealing structure for liquid medium |
| CN112502859A (en) * | 2020-10-09 | 2021-03-16 | 蓝箭航天技术有限公司 | High-speed dynamic sealing element test device for rocket engine |
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| CN112128381B (en) * | 2020-10-26 | 2021-07-20 | 常熟理工学院 | Sealing device for variable working condition gas-liquid two-phase fluid medium |
| CN113405735B (en) * | 2021-04-30 | 2022-11-11 | 北京航天动力研究所 | High-speed helium end face sealing test device for liquid rocket engine turbine pump |
| CN216666495U (en) * | 2021-12-21 | 2022-06-03 | 自贡科誉密封科技有限公司 | High-temperature mechanical seal |
| CN114646430A (en) * | 2022-04-15 | 2022-06-21 | 浙江省机电设计研究院有限公司 | Test method of double-end-face mechanical seal static pressure operation test bed |
| CN115541134A (en) * | 2022-09-20 | 2022-12-30 | 北京航天动力研究所 | Low-temperature high-speed double-station end face seal test device and method for hydrogen-oxygen turbine pump |
| CN220646755U (en) * | 2023-03-06 | 2024-03-22 | 成都一通密封股份有限公司 | Steam static pressure type sealing device |
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| CN111810643A (en) * | 2020-07-22 | 2020-10-23 | 广东博智林机器人有限公司 | Axial sealing structure for liquid medium |
| CN112502859A (en) * | 2020-10-09 | 2021-03-16 | 蓝箭航天技术有限公司 | High-speed dynamic sealing element test device for rocket engine |
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