CN110985373B - Servo labyrinth seal structure - Google Patents
Servo labyrinth seal structure Download PDFInfo
- Publication number
- CN110985373B CN110985373B CN201911158607.1A CN201911158607A CN110985373B CN 110985373 B CN110985373 B CN 110985373B CN 201911158607 A CN201911158607 A CN 201911158607A CN 110985373 B CN110985373 B CN 110985373B
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- CN
- China
- Prior art keywords
- labyrinth seal
- seal assembly
- gear pump
- pump shell
- driving gear
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
- F04C15/0023—Axial sealings for working fluid
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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
Abstract
The invention belongs to the field of machinery, and relates to a follow-up labyrinth seal structure, which comprises a gear pump shell, a labyrinth seal assembly and a driving gear; the gear pump shell comprises a cylinder body with an axial through hole and an end cover arranged at the bottom of the cylinder body; the labyrinth seal assembly is sleeved outside the driving gear and is integrally arranged in the axial through hole of the gear pump shell; the driving gear is contacted with the end cover; the follow-up labyrinth seal structure further comprises a seal ring arranged between the labyrinth seal assembly and the gear pump shell, and an anti-rotation pin arranged between the labyrinth seal assembly and the gear pump shell and used for preventing the labyrinth seal assembly from rotating synchronously along with the driving gear. The invention provides a follow-up labyrinth seal structure capable of realizing high-pressure rotary seal of a fuel gear pump.
Description
Technical Field
The invention belongs to the field of machinery, relates to a follow-up labyrinth seal structure, and particularly relates to a high-pressure (more than 13MPa) rotary seal structure of a fuel gear pump.
Background
The shaft tail seal of the fuel gear pump usually adopts end face mechanical seal, and generally comprises a movable ring, a static ring and a spring (a loading device), wherein the static ring is generally arranged on an end cover, the movable ring is generally arranged on a transmission shaft or the movable ring is directly acted by a gear, and the gear pump has the advantages of compact structure, high working reliability, long service life and the like, but the seal and the volatile effect of the high-pressure (more than 13MPa) fuel are difficult to realize. The labyrinth seal structure is simple, is generally used for sealing parts with low requirements on high pressure and leakage, and has larger leakage when the labyrinth seal is used for sealing high-pressure (more than 13MPa) fuel.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a follow-up labyrinth seal structure capable of realizing high-pressure rotary seal of a fuel gear pump.
In order to achieve the purpose, the invention adopts the following technical scheme:
a follow-up labyrinth seal structure comprises a gear pump shell, a labyrinth seal assembly and a driving gear; the gear pump shell comprises a cylinder body with an axial through hole and an end cover arranged at the bottom of the cylinder body; the labyrinth seal assembly is sleeved outside the driving gear and is integrally arranged in the axial through hole of the gear pump shell; the driving gear is in contact with the end cover; the method is characterized in that: the follow-up labyrinth seal structure further comprises a seal ring arranged between the labyrinth seal assembly and the gear pump shell, and an anti-rotation pin arranged between the labyrinth seal assembly and the gear pump shell and used for preventing the labyrinth seal assembly from rotating synchronously along with the driving gear.
The labyrinth seal assembly is provided with a groove; the sealing ring is arranged in the groove.
And a protective ring parallel to the sealing ring is also arranged in the groove.
The follow-up labyrinth seal structure further comprises a collar which is arranged on the gear pump shell and used for limiting the axial movement of the labyrinth seal assembly along the labyrinth seal assembly.
An end face mechanical seal assembly is arranged between the driving gear and the end cover.
The invention has the advantages that:
the invention provides a follow-up labyrinth seal structure which comprises a gear pump shell, a labyrinth seal assembly and a driving gear, wherein the gear pump shell is provided with a bearing; the gear pump shell comprises a cylinder body with an axial through hole and an end cover arranged at the bottom of the cylinder body; the labyrinth seal assembly is sleeved outside the driving gear and is integrally arranged in the axial through hole of the gear pump shell; the driving gear is contacted with the end cover; the follow-up labyrinth seal structure further comprises a seal ring arranged between the labyrinth seal assembly and the gear pump shell, and an anti-rotation pin arranged between the labyrinth seal assembly and the gear pump shell and used for preventing the labyrinth seal assembly from rotating synchronously along with the driving gear. The invention throttles and reduces pressure of high-pressure (more than 13MPa) fuel oil through a straight-through follow-up labyrinth seal, in order to ensure the throttling and pressure reducing effect of the labyrinth seal and avoid collision and abrasion in the throttling and pressure reducing process, the labyrinth seal is designed to have a follow-up structure, the fuel oil is communicated with a low-pressure area (0.3 MPa-1.2 MPa) of a system after throttling and pressure reducing, and then the low-pressure (0.3 MPa-1.2 MPa) fuel oil is sealed through end face mechanical seal, thereby realizing the sealing of the high-pressure (more than 13MPa) fuel oil.
Drawings
FIG. 1 is a schematic diagram of a trailing labyrinth seal provided by the present invention;
FIG. 2 is a schematic structural diagram of a follower labyrinth seal structure provided by the present invention;
wherein:
1-a gear pump housing; 2-a labyrinth seal assembly; 3-a drive gear; 4-end face mechanical seal assembly; 5-anti-rotation pin; 6-sealing ring; 7-a guard circle; 8-a collar.
Detailed Description
Referring to fig. 1 and 2, the present invention provides a follower type labyrinth seal structure, which comprises a gear pump housing 1, a labyrinth seal assembly 2 and a driving gear 3; the gear pump shell 1 comprises a cylinder body with an axial through hole and an end cover arranged at the bottom of the cylinder body; the labyrinth seal assembly 2 is sleeved outside the driving gear 3 and is integrally arranged in an axial through hole of the gear pump shell 1; the driving gear 3 is contacted with the end cover; the method is characterized in that: the follow-up labyrinth seal structure further comprises a seal ring 6 arranged between the labyrinth seal assembly 2 and the gear pump shell 1, and an anti-rotation pin 5 arranged between the labyrinth seal assembly 2 and the gear pump shell 1 and used for preventing the labyrinth seal assembly 2 from rotating synchronously along with the driving gear 3.
A groove is arranged on the labyrinth seal component 2; the sealing ring 6 is arranged in the groove, and a protective ring 7 parallel to the sealing ring 6 is further arranged in the groove. The follower type labyrinth seal structure further includes a collar 8 provided on the gear pump housing 1 for restricting axial play of the labyrinth seal assembly 2 along the labyrinth seal assembly 2.
An end face mechanical seal assembly 4 is arranged between the driving gear 3 and the end cover.
The invention throttles and reduces pressure of high-pressure (more than 13MPa) fuel oil through a straight-through follow-up labyrinth seal, in order to ensure the throttling and pressure reducing effect of the labyrinth seal and avoid collision and abrasion in the throttling and pressure reducing process, the labyrinth seal is designed to have a follow-up structure, the fuel oil is communicated with a low-pressure area (0.3 MPa-1.2 MPa) of a system after throttling and pressure reducing, and then the low-pressure (0.3 MPa-1.2 MPa) fuel oil is sealed through end face mechanical seal, thereby realizing the sealing of the high-pressure (more than 13MPa) fuel oil.
As shown in figure 1, in the working process of the fuel gear pump, a driving gear 3 rotates, high-pressure (more than 13MPa) fuel inside a gear pump shell 1 is throttled by a straight-through follow-up labyrinth seal assembly 2, the throttled fuel is communicated with system low-pressure fuel, the high-pressure (more than 13MPa) fuel is reduced to low-pressure (0.3 MPa-1.2 MPa) fuel, and the end face mechanical seal assembly 4 and the driving gear 3 jointly act to seal the low-pressure (0.3 MPa-1.2 MPa) fuel. In the fuel gear pump working process, as shown in fig. 2, the driving gear 3 is in rotary motion, can take place the skew on the radial direction, for improving the throttle effect, labyrinth seal subassembly 2 and driving gear 3 need set up very little clearance (about 0.03 mm), for guarantee that certificate labyrinth seal subassembly 2 and driving gear 3 do not take place wearing and tearing, set up great clearance (about 0.25 mm) between labyrinth seal subassembly 2 and gear pump casing 1, make labyrinth seal subassembly 2 along with the 3 squints of driving gear and do not take place to bump and grind with gear pump casing 1 when the driving gear 3 takes place the skew, labyrinth seal subassembly 2 has the mobility promptly. The anti-rotation pin 5 prevents the labyrinth seal assembly 2 from rotating along with the driving gear 3, the sealing ring 6 and the protective ring 7 realize high-pressure (more than 13MPa) static seal, and the retainer ring 8 limits the axial movement of the labyrinth seal assembly 2.
Claims (4)
1. A follow-up labyrinth seal structure comprises a gear pump shell (1), a labyrinth seal assembly (2) and a driving gear (3); the gear pump shell (1) comprises a cylinder body with an axial through hole and an end cover arranged at the bottom of the cylinder body; the labyrinth seal assembly (2) is sleeved outside the driving gear (3) and is integrally arranged in an axial through hole of the gear pump shell (1); the driving gear (3) is in contact with the end cover; the method is characterized in that: the follow-up labyrinth seal structure also comprises a seal ring (6) arranged between the labyrinth seal assembly (2) and the gear pump shell (1), and an anti-rotation pin (5) arranged between the labyrinth seal assembly (2) and the gear pump shell (1) and used for preventing the labyrinth seal assembly (2) from synchronously rotating along with the driving gear (3); an end face mechanical seal assembly (4) is arranged between the driving gear (3) and the end cover;
a first gap is formed between the labyrinth seal assembly (2) and the driving gear (3); a second gap is arranged between the labyrinth seal assembly (2) and the gear pump shell (1); the second gap is larger than the first gap; when the driving gear (3) deflects, the labyrinth seal assembly (2) deflects along with the driving gear (3) and does not collide and rub with the gear pump shell (1);
the labyrinth seal assembly (2) is of the straight-through type.
2. The follow-up labyrinth seal structure according to claim 1, characterized in that: a groove is formed in the labyrinth seal assembly (2); the sealing ring (6) is arranged in the groove.
3. The follow-up labyrinth seal structure according to claim 2, characterized in that: and a protective ring (7) which is parallel to the sealing ring (6) is also arranged in the groove.
4. The follow-up labyrinth seal structure according to claim 3, characterized in that: the follow-up labyrinth seal structure further comprises a clamping ring (8) which is arranged on the gear pump shell (1) and used for limiting the axial movement of the labyrinth seal assembly (2) along the labyrinth seal assembly (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911158607.1A CN110985373B (en) | 2019-11-22 | 2019-11-22 | Servo labyrinth seal structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911158607.1A CN110985373B (en) | 2019-11-22 | 2019-11-22 | Servo labyrinth seal structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110985373A CN110985373A (en) | 2020-04-10 |
| CN110985373B true CN110985373B (en) | 2022-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911158607.1A Active CN110985373B (en) | 2019-11-22 | 2019-11-22 | Servo labyrinth seal structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110985373B (en) |
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| CN110985373A (en) | 2020-04-10 |
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