CN210566259U

CN210566259U - Anchor-shaped dry gas sealing mechanism

Info

Publication number: CN210566259U
Application number: CN201921641530.9U
Authority: CN
Inventors: 席文奎; 姜辛
Original assignee: Xian Shiyou University
Current assignee: Xian Shiyou University
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2020-05-19
Anticipated expiration: 2029-09-29

Abstract

An anchor-shaped dry gas sealing mechanism comprises a rotating shaft fixed on a machine bearing, wherein a shaft sleeve is arranged on the rotating shaft, and a locking sleeve and a movable ring are arranged on the shaft sleeve; a sealing ring A is arranged between the shaft sleeve and the movable ring; the movable ring is in contact with one end of the static ring, the other end of the static ring is in contact with the push ring, the push ring and the static ring are both arranged on the spring seat, a gap is formed between the static ring and the spring seat, a spring is arranged on the spring seat, the other end of the spring is arranged on the push ring, the movable ring is sequentially provided with a three-stage weir area, a dam area and an anchor-shaped groove area from the outer diameter to the center, and the movable ring rotates along with the rotation of the rotating shaft; will form the one deck air film between rotating ring and quiet ring, the air film promotes quiet ring and moves forward, and the spring reaches balanced state with push ring, quiet ring under the effect of spring force, the utility model has the characteristics of can not receive the influence, the fluting form stability of soon to, can continue to keep the air film stable, by the difficult contaminated of sealing fluid when reliability height, longe-lived, gyration.

Description

Anchor-shaped dry gas sealing mechanism

Technical Field

The utility model belongs to the technical field of mechanical seal, in particular to anchor shape dry gas sealing mechanism.

Background

Dry gas seals, as a new, advanced, non-contact mechanical sealing device for rotating shafts, are mainly used to seal gas or liquid media in rotating machines, and are the most common and excellent sealing form in the present stage. Compared with other seals, the sealing device has the characteristics of low leakage rate, no abrasion operation, low energy consumption, long service life, simplicity and reliability in operation, no oil pollution to sealed fluid and the like. Because the dry gas seal belongs to the technology of shallow slot on the surface of mechanical seal, the slot shape selection of the slot on the sealing end surface is always the object of dry gas seal research, so as to prolong the service life of the dry gas seal. At present, the grooves on the end faces of the dry gas seal are various in form, poor in reliability and easy to leak after long-term use. When the machine rotates, the sealing air film is easily damaged, and the sealed fluid is polluted by oil and other impurities. Therefore, a novel dry gas sealing device is urgently needed, and has the advantages of higher reliability and sealing performance, low production cost, convenience in maintenance and no influence of machine rotation.

Disclosure of Invention

In order to overcome not enough of present dry gas sealing device technique, the utility model aims to provide an anchor shape dry gas sealing mechanism, have can not receive the influence of turning to, and the fluting form is stable, the reliability is high, long service life, can continue to keep the stability of air film during the gyration, by the characteristics that sealed fluid is difficult by other impurity contamination, it is various to have solved present dry gas sealing device fluting form, the reliability is poor, long-term use takes place easily to leak, and destroy sealed air film during the gyration easily, lead to being contaminated problem easily by sealed fluid.

In order to achieve the above purpose, the utility model discloses a technical scheme is:

an anchor-shaped dry gas sealing mechanism comprises a rotating shaft 6 fixed on a machine bearing, wherein a shaft sleeve 5 is arranged on the rotating shaft 6, and a locking sleeve 11 is arranged on the shaft sleeve 5; the shaft sleeve 5 is also provided with a movable ring 2, and the shaft sleeve 5 and the movable ring 2 are fixed through a positioning pin 3; a sealing ring A4 is arranged between the shaft sleeve 5 and the movable ring 2;

the one end contact of rotating ring 2 and quiet ring 1, the other end contact throw-out collar 7 of quiet ring 1, throw-out collar 7 and quiet ring 1 are all installed on spring holder 9, and have the space between quiet ring 1 and the spring holder 9, install spring 8 on the spring holder 9, and the other end of spring 8 is installed on throw-out collar 7, and spring holder 9 is whole to be fixed on the external equipment casing, and is provided with B sealing washer 10 between.

The moving ring 2 is provided with a first-level weir area 13, a second-level weir area 14, a third-level weir area 15 and a dam area 16 in sequence from the outer diameter to the center, and an anchor-shaped groove area 12 is arranged between the adjacent first-level weir area 13, the adjacent second-level weir area 14 and the adjacent third-level weir area 15.

The anchor groove area 12 has a small airflow inlet, smooth air gathering, middle communication, a large bottom area and an arc-shaped end surface.

Circular grooves with the same size are arranged on the primary weir area 13 and the secondary weir area 14.

A small circular groove is arranged on the dam area 16, and the radius of the small circular groove is smaller than that of the circular grooves on the primary weir area 13 and the secondary weir area 14.

The utility model has the advantages that:

the device is not influenced by the rotation direction, has stable grooving form, high reliability and long service life, can continuously keep the stability of the sealing air film during rotation, and ensures that the sealed fluid is not easily polluted by other impurities.

Drawings

Fig. 1 is a schematic structural view of the dry gas sealing device of the present invention.

Fig. 2 is the structural schematic diagram of the sealing end face slotting of the present invention.

Fig. 3 is a schematic view of the three-dimensional structure of the movable ring of the present invention.

Detailed Description

In order to make the present invention easier to understand and to make the advantages more prominent, the present invention will be described in more detail with reference to the accompanying drawings and the following detailed description.

Referring to fig. 1, an anchor-shaped dry gas sealing mechanism comprises a rotating shaft 6 fixed on a machine bearing, wherein a shaft sleeve 5 is arranged on the rotating shaft 6, and a locking sleeve 11 is arranged on the shaft sleeve 5 to fix the shaft sleeve; the shaft sleeve 5 is also provided with a movable ring 2, and the shaft sleeve 5 and the movable ring 2 are fixed through a positioning pin 3; an a-ring seal 4 is provided between the sleeve 5 and the rotating ring 2 to prevent leakage of the sealed fluid.

The one end contact of rotating ring 2 and quiet ring 1, the other end contact throw-out collar 7 of quiet ring 1, throw-out collar 7 and quiet ring 1 are all installed on spring holder 9, and have the space between quiet ring 1 and the spring holder 9, can compensate the clearance that produces when the clearance that the air film produced or machine vibration. The spring 8 is arranged on the spring seat 9, the other end of the spring 8 is arranged on the push ring 7, the spring seat 9 is wholly fixed on the external equipment shell, and a B sealing ring 10 is arranged between the spring seat 9 and the external equipment shell.

Referring to fig. 2, the moving ring 2 is provided with a first-stage weir area 13, a second-stage weir area 14, a third-stage weir area 15 and a dam area 16 in sequence from the outer diameter to the center, and an anchor groove area 12 is arranged between the adjacent first-stage weir area 13, second-stage weir area 14 and third-stage weir area 15.

The anchor groove area 12 has small airflow inlet, smooth air gathering, middle communication, large bottom area and arc end surface, and has good effect on forming an air film of the sealing device.

Circular grooves with the same size are arranged on the primary weir area 13 and the secondary weir area 14 to enhance the pressure.

And a small circular groove is arranged on the dam area 16, and the radius of the small circular groove is smaller than that of the circular grooves on the primary weir area 13 and the secondary weir area 14, so that the pressure is reduced, and the pressure is conveniently relieved.

The utility model discloses a theory of operation does: ocean wave power generation facility's implementation process do, will the utility model discloses install on rotation axis 6, along with rotation axis 6's operation, drive axle sleeve 5 and rotate together, axle sleeve 5 makes rotating ring 2 be rotary motion through locating pin 3. When the rotating ring 2 rotates, a layer of air film is formed between the rotating ring 2 and the static ring 1, the air film pushes the static ring 1 to move forwards, the static ring 1 pushes the push ring 7 to compress the spring 8, and the spring 8 reaches a balance state with the push ring 7 and the static ring 1 under the action of the spring force. The air film is in a dynamic equilibrium state.

When the rotating ring 2 rotates, gas enters the anchor groove area 12, the outer diameter of the gas faces the center of the rotating ring 2, radial components flow towards the second-stage weir area 14 through the first-stage weir area 13 until the radial components flow into the third-stage weir area 15, the gas is prevented from flowing to the center, the gas is compressed to cause pressure rise, a sealing end surface gap is statically determined to form a required gas film, the speed of rotation of a shaft can be automatically controlled in the gap of the end surface, the final end surface gap opening force is balanced with the elastic force of the spring, the gas film has good elasticity, stable operation is formed, the sealing end surfaces are prevented from being in contact with each other, and the service life is prolonged. When the gap between the end faces is gradually increased due to vibration or sudden increase of the rotating speed, the pressure of the air film is rapidly increased, the elastic force of the spring 8 is smaller than the opening force of the gap between the end faces, the end faces are forced to be away from each other under the action of the spring force, and the stable gap is restored. On the contrary, when the gap between the end faces is gradually reduced due to vibration or sudden reduction of the rotating speed, the pressure of the air film is rapidly reduced, the elastic force of the spring 8 is greater than the opening force of the gap between the end faces, the end faces are forced to be close to each other under the action of the spring force, and a stable gap is recovered.

Claims

1. An anchor-shaped dry gas sealing mechanism is characterized by comprising a rotating shaft (6) fixed on a machine bearing, wherein a shaft sleeve (5) is arranged on the rotating shaft (6), and a locking sleeve (11) is arranged on the shaft sleeve (5); the shaft sleeve (5) is also provided with a movable ring (2), and the shaft sleeve (5) and the movable ring (2) are fixed through a positioning pin (3); a sealing ring A (4) is arranged between the shaft sleeve (5) and the movable ring (2);

the one end contact of rotating ring (2) and quiet ring (1), the other end contact throw-out collar (7) of quiet ring (1), throw-out collar (7) and quiet ring (1) are all installed on spring holder (9), and have the space between quiet ring (1) and spring holder (9), install spring (8) on spring holder (9), the other end of spring (8) is installed on throw-out collar (7), spring holder (9) are whole to be fixed on the external equipment casing, and between be provided with B sealing washer (10).

2. An anchor-shaped dry gas sealing mechanism as claimed in claim 1, wherein the movable ring (2) is provided with a primary weir area (13), a secondary weir area (14), a tertiary weir area (15) and a dam area (16) in sequence from the outer diameter to the center, and an anchor-shaped groove area (12) is arranged between the adjacent primary weir area (13), the secondary weir area (14) and the tertiary weir area (15).

3. An anchor dry gas seal according to claim 2, wherein circular grooves of equal size are provided in the primary weir area (13) and the secondary weir area (14).

4. An anchor dry gas seal according to claim 2, characterized in that small circular grooves are provided in the dam area (16), the small circular grooves having a smaller radius than the circular grooves in the primary weir area (13) and the secondary weir area (14).

5. An anchor dry gas seal according to claim 2 wherein the anchor groove region (12) has a small gas inlet and smooth gas collection, intermediate communication, large bottom area, and curved end surfaces.