CN210686993U - Mechanical sealing device with adjustable and controllable local film thickness between sealing end faces - Google Patents
Mechanical sealing device with adjustable and controllable local film thickness between sealing end faces Download PDFInfo
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- CN210686993U CN210686993U CN201921424221.6U CN201921424221U CN210686993U CN 210686993 U CN210686993 U CN 210686993U CN 201921424221 U CN201921424221 U CN 201921424221U CN 210686993 U CN210686993 U CN 210686993U
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Abstract
The mechanical sealing device with the adjustable and controllable local film thickness between the sealing end surfaces comprises a positioning ring, a moving ring seat, a static ring seat and a sealing end cover; the fixed ring is compacted on the fixed ring seat by the positioning ring, the end surface of the movable ring is axially matched with the end surface of the fixed ring, the movable ring is arranged on the movable ring seat and rotates along with the shaft, and a pushing spring is arranged between the movable ring and the movable ring seat; the static ring is arranged on the static ring seat, and the static ring seat is arranged on the sealing end cover; an oil storage cavity is arranged in the static ring, the oil storage cavity is a blind hole with an opening at the back of the static ring, and the top end of the oil storage cavity is close to the end face of the static ring; a piston cavity is arranged in the static ring seat, the piston cavity is a blind hole with an opening on the joint surface of the static ring seat and the static ring, and the piston cavity and the oil storage cavity are butted to form a uniform cavity parallel to the axial direction; be equipped with double-end piston in the unified cavity, double-end piston one end is located the oil storage intracavity, and the other end is located the piston intracavity, and double-end piston is along unified cavity axial displacement in order to change oil storage intracavity pressure, and the piston chamber is through the inlet channel intercommunication air-vent valve that passes quiet ring seat and end cover to adjust piston intracavity pressure.
Description
Technical Field
The utility model relates to a shaft end mechanical seal device is particularly suitable for the mechanical seal application occasion that needs carry out online adjustment to the thick and fluid film rigidity of seal end face fluid film.
Background
In critical turbomachines, such as the main reactor coolant pump, the mechanical seal plays a crucial role. The key to long life and high reliability of the mechanical seal is continuous full film lubrication, neither excessive leakage nor lack of lubrication between the end faces in the pursuit of too low a leakage rate. When the leakage rate is too high or lubrication between end faces is lacked, the temperature and pressure in the sealing device are changed, the sealing reliability is reduced, and even the sealing device fails. The seals can only be repaired by shutting down the reactor coolant pumps when they fail, and the economic loss of shutting down the reactor coolant pumps is significant.
The excessive leakage or lack of lubrication is caused by the change of the fluid film thickness between the end faces of the dynamic ring and the static ring, and the poor sealing stability is caused by the small rigidity of the fluid film between the end faces and even the negative rigidity, so that the control of the film thickness between the end faces and the distribution thereof in the radial direction is one of important effective means for regulating the leakage rate and ensuring the stable operation of the sealing. In order to solve the problem of excessive leakage or lack of lubrication of seals without shutting down a reactor coolant pump or other critical turbomachines, some researchers have conducted related research and have obtained certain solutions, salt (salt rf, Payne J W, Johnson W R, et al.simulation of a hydraulic controlled compressor mutual pump seal [ J ]. Tribology International,2018.) changes the film thickness between the seal end faces by using a hydraulically driven seal, but the device is complicated and the way to implement the practical use is long; etsion et al (Etion I, Palmor Z, Harari N. Feasibility study of a controlled mechanical seal. Lubr. Eng. 1991; 47: 621-5.) and Zou et al (Zou M, Green I. Clearance control of mechanical face seal. Tribol Trans 1999; 42: 535-40.) suggest that leak rate can be controlled by controlling the seal closure force to regulate the fluid film thickness between faces.
The utility model provides a, just be difficult to effectively regulate and control and have had the urgent problem that adjusting technique and device are complicated and the practicality is not high in order to solve above-mentioned mechanical seal leakage rate and fluid film rigidity.
Disclosure of Invention
To the problem that current mechanical seal device leakage rate and fluid film rigidity are difficult to the regulation and control, the utility model provides a through adjusting that the seal end face warp and then regulate and control local membrane thickness between the terminal surface, realize the adjustable and controllable type mechanical seal device of leakage rate and fluid film rigidity regulation and control. The device changes the fluid pressure on the piston arranged in the static ring, so that the end faces of the static ring are locally deformed in different degrees, and the convergent fluid film thickness in the radial direction is formed between the end faces, thereby finally achieving the purposes of regulating and controlling the leakage rate, increasing the rigidity of a liquid film and improving the operation stability of a mechanical seal.
The technical scheme of the utility model is that:
the mechanical sealing device with the adjustable and controllable local film thickness between the sealing end faces comprises a positioning ring 11, a moving ring 6, a moving ring seat 5, a static ring 4, a static ring seat 3 and a sealing end cover 2; the fixed ring 4 is compacted on the fixed ring seat 3 by the positioning ring 11, so that the fixed ring is prevented from generating axial displacement relative to the fixed ring seat; the end surface of the movable ring 6 is axially matched with the end surface of the static ring 4, the movable ring 6 is arranged on the movable ring seat 5 and rotates along with the shaft, and a pushing spring is arranged between the movable ring 6 and the movable ring seat 5; the static ring 4 is arranged on the static ring seat 3, and the static ring seat 3 is arranged on the sealing end cover 2; one surface of the static ring 4 facing the dynamic ring 6 is taken as an end surface, one surface of the static ring 4 back to the dynamic ring 6 is taken as a back surface, an oil storage cavity 1c is arranged in the static ring 4, the oil storage cavity 1c is a blind hole with an opening at the back surface of the static ring 4, and the top end of the oil storage cavity 1c is close to the end surface of the static ring 4; a piston cavity 1a is arranged in the static ring seat 3, the piston cavity 1a is a blind hole opened on the joint surface of the static ring seat 3 and the static ring 4, and the piston cavity 1a and the oil storage cavity 1c are butted to form a uniform cavity parallel to the axial direction; be equipped with double-end piston 1b in the unified cavity, double-end piston 1b one end is located oil storage chamber 1c, and the other end is located piston chamber 1a, and double-end piston 1b is along unified cavity axial displacement in order to change oil storage chamber 1c internal pressure, and piston chamber 1a communicates air-vent valve 1e through the inlet channel 1d that passes quiet ring seat 3 and end cover 2 to adjust piston chamber 1a internal pressure.
Preferably, the distance between the top end of the oil chamber 1c and the end face of the stationary ring 4 is 0.5 to 2.5 mm.
Further, a plurality of piston pressure regulating structures 1 are provided on the stationary ring 4, and the depth of the oil storage chamber 1c of each piston pressure regulating structure 1 is increased in order according to the distance from the outer side to the inner side of the end face of the stationary ring 4 of each piston pressure regulating structure 1.
Further, the increase of the depth of the oil storage chamber 1c of each piston pressure regulating structure 1 is 0.05-0.25 mm.
Preferably, the diameter B1 of the oil reservoir chamber 1c is smaller than the diameter B2 of the piston chamber 1 a; the double-ended piston 1b is located in the oil storage chamber 1c, one end of the double-ended piston has a diameter A1, the other end of the double-ended piston has a diameter A2, and A1 is 2-10mm smaller than A2.
Preferably, the inner piston cavity 1a is provided with a limit step of the double-headed piston 1b away from the stationary ring side, so as to limit the stroke of the double-headed piston 1b away from the stationary ring side.
Preferably, the axial lines of the oil storage chamber 1c, the piston chamber 1a and the double-headed piston 1b are located on the same straight line parallel to the axial line.
The working principle of the utility model is as follows:
the utility model discloses in because double-end piston can receive the pressure action of the interior oil storage intracavity of quiet ring and the pressure action of piston intracavity in the quiet ring seat, the former receives the transmission of the latter effort through the piston, receives the effect of oil storage chamber pressure, and this part terminal surface produces and warp. For preventing that the quiet ring from receiving the effect of oil storage chamber pressure and piston frictional force to produce the displacement to the rotating ring direction, set up the holding ring on quiet ring and quiet ring seat, adopt holding screw to consolidate holding ring and quiet ring seat together to paste quiet ring and quiet ring seat tightly, prevent that the quiet ring from receiving the combined action of piston chamber pressure and piston seal ring frictional force to produce the sliding displacement to the rotating ring direction, ensure to produce relative axial displacement and possible hydraulic fluid's leakage between quiet ring and the quiet ring seat. If only one piston pressure regulating structure is arranged in the static ring, the end faces deform only at the radial position where the oil storage cavity is arranged in the radial direction, the film thickness between the end faces is small, and the radial local convergence from the outer diameter of the end faces to the position is formed; if two or more piston pressure regulating structures are arranged in the static ring, the depth of the oil storage cavity is gradually deepened from the outer diameter of the end face to the inner diameter along the radial direction, the local deformation of the end face of the static ring correspondingly generates a change rule from small to large on the premise that the pressure of the oil storage cavity is the same, and as a result, the film thickness distribution which is in a convergent shape from the outer diameter of the end face to the inner diameter is formed on the end face. The mechanical seal with the film thickness change rule not only regulates and controls the leakage rate, but also improves the liquid film rigidity, the seal operation stability and the service life. In addition, under the condition that the depth of the oil storage cavity or the thickness of the end part of the oil storage cavity from the sealing end face is consistent and equal, the pressure value in the piston cavity in the static ring seat can be set from low to high, so that the film thickness distribution which is in a convergent shape from the outer diameter of the end face to the inner diameter of the end face is obtained, and the purposes of regulating and controlling the leakage rate, increasing the rigidity of a liquid film and improving the operation stability of the mechanical seal are finally achieved.
The utility model provides a technical scheme adopts the hydropneumatic drive mode, and the terminal surface through changing quiet ring warp and along radial distribution and change law, realizes the regulation and control of the terminal surface membrane thickness, and then realizes the high-efficient regulation and control to leakage rate.
The utility model has the advantages that: the simple and reliable mechanical structure is used for obtaining the film thickness distribution which is in a convergent shape from the outer diameter to the inner diameter of the end face, finally the leakage rate is regulated and controlled, the rigidity of a liquid film is increased, and the operation stability of the mechanical seal is improved.
Drawings
FIG. 1 is a schematic structural view of a piston pressure regulating structure in the device of the present invention;
FIG. 2a is a schematic structural view of an oil storage cavity and a piston cavity in a stationary ring of the present invention;
FIG. 2b is another schematic structural view of the oil storage cavity and the piston cavity in the stationary ring according to the present invention;
fig. 3 is a schematic structural diagram of the present invention including three piston pressure adjusting structures.
Detailed Description
The technical scheme of the utility model is explained in detail with the attached drawings as follows:
with reference to fig. 1, 2a, 2b and 3:
as shown in fig. 1, the mechanical sealing device with adjustable and controllable local film thickness between sealing end surfaces comprises a positioning ring 11, a moving ring 6, a moving ring seat 5, a stationary ring 4, a stationary ring seat 3 and a sealing end cover 2; the fixed ring 4 is compacted on the fixed ring seat 3 by the positioning ring 11, so that the fixed ring is prevented from generating axial displacement relative to the fixed ring seat; the end surface of the movable ring 6 is axially matched with the end surface of the static ring 4, the movable ring 6 is arranged on the movable ring seat 5 and rotates along with the shaft, and a pushing spring is arranged between the movable ring 6 and the movable ring seat 5; the static ring 4 is arranged on the static ring seat 3, and the static ring seat 3 is arranged on the sealing end cover 2; one surface of the static ring 4 facing the dynamic ring 6 is taken as an end surface, one surface of the static ring 4 back to the dynamic ring 6 is taken as a back surface, an oil storage cavity 1c is arranged in the static ring 4, the oil storage cavity 1c is a blind hole with an opening at the back surface of the static ring 4, and the top end of the oil storage cavity 1c is close to the end surface of the static ring 4; a piston cavity 1a is arranged in the static ring seat 3, the piston cavity 1a is a blind hole opened on the joint surface of the static ring seat 3 and the static ring 4, and the piston cavity 1a and the oil storage cavity 1c are butted to form a uniform cavity parallel to the axial direction; be equipped with double-end piston 1b in the unified cavity, double-end piston 1b one end is located oil storage chamber 1c, and the other end is located piston chamber 1a, and double-end piston 1b is along unified cavity axial displacement in order to change oil storage chamber 1c internal pressure, and piston chamber 1a communicates air-vent valve 1e through the inlet channel 1d that passes quiet ring seat 3 and end cover 2 to adjust piston chamber 1a internal pressure.
As shown in fig. 2a and 2b, the distance between the wall surface of the oil storage chamber 1c in the static ring 4 close to the dynamic ring side and the end surface of the static ring is 0.5-2.5 mm.
As shown in fig. 2a, the diameter B1 of the oil reservoir chamber 1c is smaller than the diameter B2 of the piston chamber 1 a; the double-ended piston 1b is located in the oil storage chamber 1c, one end of the double-ended piston has a diameter A1, the other end of the double-ended piston has a diameter A2, and A1 is 2-10mm smaller than A2. It is also possible to adopt a structure as shown in fig. 2B, in which the diameter B1 of the oil chamber 1c is larger than the diameter B2 of the piston chamber 1a, and the diameter a1 of the double-headed piston 1B at one end of the oil chamber 1c is larger than the diameter a2 at the other end.
As shown in fig. 3, the number of the piston pressure regulating structures 1 in one sealing device can be multiple, and the number of the piston pressure regulating structures is in the range of 1-6; when the number of the piston pressure regulating structures 1 is two or more, the depth of the oil storage cavity 1c in the stationary ring of each piston pressure regulating structure 1 is increased in sequence according to the distance from the outer side of the end face to the inner side of the piston pressure regulating structure 1, and the increase amplitude is 0.05-0.25 mm.
And the side of the piston cavity 1a far away from the static ring is provided with a limit step of the double-headed piston, and the limit step is used for limiting the movement stroke of the double-headed piston far away from the static ring.
The oil storage cavity 1c in the static ring, the piston cavity 1a in the static ring seat and the double-head piston 1b are concentric.
The description is only intended to illustrate the embodiments of the invention, and the scope of the invention should not be limited to the embodiments described, but also includes equivalent technical means which can be conceived by those skilled in the art.
Claims (7)
1. The mechanical sealing device with the adjustable and controllable local film thickness between the sealing end faces comprises a positioning ring (11), a moving ring (6), a moving ring seat (5), a static ring (4), a static ring seat (3) and a sealing end cover (2); the static ring (4) is compacted on the static ring seat (3) by the positioning ring (11), the end surface of the dynamic ring (6) is axially matched with the end surface of the static ring (4), the dynamic ring (6) is arranged on the dynamic ring seat (5) and rotates along with the shaft, and a pushing spring is arranged between the dynamic ring (6) and the dynamic ring seat (5); the static ring (4) is arranged on the static ring seat (3), and the static ring seat (3) is arranged on the sealing end cover (2); the method is characterized in that: one surface of the static ring (4) facing the moving ring (6) is used as an end surface, one surface of the static ring (4) back to the moving ring (6) is used as a back surface, an oil storage cavity (1c) is arranged in the static ring (4), the oil storage cavity (1c) is a blind hole opened at the back surface of the static ring (4), and the top end of the oil storage cavity (1c) is close to the end surface of the static ring (4); a piston cavity (1a) is arranged in the static ring seat (3), the piston cavity (1a) is a blind hole with an opening on a joint surface of the static ring seat (3) and the static ring (4), and the piston cavity (1a) and the oil storage cavity (1c) are butted to form a uniform cavity parallel to the axial direction; be equipped with double-end piston (1b) in the unified cavity, double-end piston (1b) one end is located oil storage chamber (1c), the other end is located piston chamber (1a), double-end piston (1b) along unified cavity axial displacement in order to change oil storage chamber (1c) internal pressure, piston chamber (1a) is through passing inlet channel (1d) intercommunication air-vent valve (1e) of quiet ring seat (3) and end cover (2) to adjust piston chamber (1a) internal pressure.
2. The mechanical seal device with adjustable and controllable local film thickness between seal end faces according to claim 1, characterized in that: the distance between the top end of the oil storage cavity (1c) in the static ring (4) and the end surface of the static ring (4) is 0.5-2.5 mm.
3. The mechanical seal device with adjustable and controllable local film thickness between seal end faces according to claim 1, characterized in that: a plurality of piston pressure regulating structures (1) are arranged on the static ring (4); when the number of the piston pressure regulating structures (1) is two or more, the depth of the oil storage cavity (1c) of each piston pressure regulating structure (1) is increased in sequence according to the distance from the outer side of the end face to the inner side of each piston pressure regulating structure (1).
4. The mechanical seal device with adjustable and controllable local film thickness between seal end faces according to claim 3, wherein: the increase of the depth of the oil storage chamber (1c) is 0.05-0.25 mm.
5. The mechanical seal device with adjustable and controllable local film thickness between seal end faces according to claim 1, characterized in that: the diameter B1 of the oil storage cavity (1c) is smaller than the diameter B2 of the piston cavity (1a), the diameter of one end of the double-head piston (1B) positioned in the oil storage cavity (1c) is A1, the diameter of the other end of the double-head piston is A2, and A1 is 2-10mm smaller than A2.
6. The mechanical seal device with adjustable and controllable local film thickness between seal end faces according to claim 1, characterized in that: and the side of the piston cavity (1a) far away from the static ring is provided with a limit step of the double-head piston (1b) to limit the movement stroke of the double-head piston (1b) far away from the static ring.
7. The mechanical seal device with adjustable and controllable local film thickness between seal end faces according to claim 4, wherein: the axial leads of the oil storage cavity (1c), the piston cavity (1a) in the static ring seat and the double-head piston (1b) are positioned on the same straight line parallel to the axial lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921424221.6U CN210686993U (en) | 2019-08-29 | 2019-08-29 | Mechanical sealing device with adjustable and controllable local film thickness between sealing end faces |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921424221.6U CN210686993U (en) | 2019-08-29 | 2019-08-29 | Mechanical sealing device with adjustable and controllable local film thickness between sealing end faces |
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| CN210686993U true CN210686993U (en) | 2020-06-05 |
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| CN201921424221.6U Active CN210686993U (en) | 2019-08-29 | 2019-08-29 | Mechanical sealing device with adjustable and controllable local film thickness between sealing end faces |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110440005A (en) * | 2019-08-29 | 2019-11-12 | 浙江工业大学 | Local film thickness regulatable type mechanically-sealing apparatus between seal face |
| CN113494610A (en) * | 2021-07-08 | 2021-10-12 | 西华大学 | Floating ring structure with damping support and mechanical sealing device |
| CN110440005B (en) * | 2019-08-29 | 2024-05-03 | 浙江工业大学 | Mechanical sealing device with adjustable and controllable local film thickness between sealing end surfaces |
-
2019
- 2019-08-29 CN CN201921424221.6U patent/CN210686993U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110440005A (en) * | 2019-08-29 | 2019-11-12 | 浙江工业大学 | Local film thickness regulatable type mechanically-sealing apparatus between seal face |
| CN110440005B (en) * | 2019-08-29 | 2024-05-03 | 浙江工业大学 | Mechanical sealing device with adjustable and controllable local film thickness between sealing end surfaces |
| CN113494610A (en) * | 2021-07-08 | 2021-10-12 | 西华大学 | Floating ring structure with damping support and mechanical sealing device |
| CN113494610B (en) * | 2021-07-08 | 2023-06-27 | 西华大学 | Floating ring structure with damping support and mechanical sealing device |
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