CN108506494A - A kind of imitative fish bone well dry gas sealing structure - Google Patents

Abstract

The invention discloses a fishbone-like dry gas sealing structure, which includes a moving ring and a static ring; wherein, the outer diameter side of the end faces of the moving ring and the static ring is a sealing inlet, that is, a high-pressure side, and the inner diameter side is a sealing outlet, that is, a low pressure On the high-pressure side of at least one end surface of the moving ring and the static ring, there are a number of imitation herringbone grooves evenly distributed along the circumferential direction; the non-opening area between two adjacent imitation herringbone grooves in the circumferential direction is a sealing weir (4), An annular sealing dam (8) is arranged under the fishbone-like groove. The invention has significant advantages such as strong opening ability, high stability, low leakage, reduced deformation of the sealing end face, bidirectional rotation, etc., and has broad market prospects.

Description

A fishbone-like dry gas seal structure

technical field

The invention relates to a fishbone imitation dry gas sealing structure, which is suitable for various rotating mechanical seals.

Background technique

With the development of science and technology, energy power, petrochemical and other fields have put forward higher requirements for sealing structures. Dry gas seals have been widely used in rotating machinery due to their significant advantages such as low leakage, low wear, and long life. At present, most widely used dry gas seals are one-way rotary seals, which are not suitable for two-way rotary machines. However, the existing dry gas seals that can rotate in both directions have disadvantages such as weak dynamic pressure opening effect, high leakage, and large deformation of the sealing end face. In view of this situation, it is necessary to study a sealing structure suitable for bidirectional rotation that can enhance the opening ability, reduce the temperature of the end surface, reduce the leakage, and operate stably.

Contents of the invention

The purpose of the present invention is to provide a fishbone imitation dry gas seal structure, which has obvious dynamic pressure effect, strong opening ability and high stability, and can be used for various rotating mechanical seals.

The present invention adopts following technical scheme to realize:

A fishbone-like dry gas seal structure, including a moving ring and a static ring; wherein, the outer diameter side of the end faces of the moving ring and the static ring is the sealing inlet, that is, the high-pressure side, and the inner diameter side is the sealing outlet, that is, the low-pressure side; the moving ring On the high-pressure side of at least one end face of the static ring, there are several imitation herringbone grooves evenly distributed along the circumferential direction; the non-perforated area between two adjacent imitation herringbone grooves in the circumferential direction is a sealing weir, and under the imitation herringbone groove An annular sealing dam is provided.

The further improvement of the present invention is that each imitation fishbone groove includes a radial drainage groove, and a forward spiral groove, a reverse spiral groove and a "fishtail" combination groove connected with the radial drainage groove; the radial drainage groove Converge in the radial direction, the forward spiral groove and the reverse spiral groove are symmetrical about the central axis of the radial drainage groove, connected on both sides of the radial drainage groove, the forward spiral groove and the reverse spiral groove are radially from the high pressure area to the The low-pressure area shows a trend of first increasing and then decreasing, and the spiral groove in the middle of the sealing end face is the largest; the "fishtail" combined groove is symmetrical about the central axis of the radial drainage groove.

A further improvement of the present invention lies in that the profile of the radial drainage groove includes sequentially connecting the first arc, the first straight line, the second arc and the second straight line, and the first straight line and the second straight line are symmetrical about the central axis.

A further improvement of the present invention is that the profile of the forward spiral groove includes the first circular arc line, the first helix line and the second circular arc line connected in sequence, and the profile of the reverse spiral groove includes the third circular arc line connected in sequence, The second helix and the fourth arc; the profile of the "fishtail" combination groove includes the fifth arc, the third helix, the sixth arc, the fourth helix and the seventh arc connected in sequence .

The further improvement of the present invention lies in that the adjacent spiral grooves of two adjacent fishbone-like grooves in the circumferential direction are connected by circular arc grooves.

The further improvement of the present invention lies in that directional large holes are arranged downstream of the forward spiral groove and the reverse spiral groove, and the directional large holes are elliptical large holes or rhombus large holes.

A further improvement of the present invention is that the fishbone-like groove is a groove of equal depth, a stepped groove of unequal depth or a converging cone angle of unequal depth.

The further improvement of the present invention is that the sealing dam is evenly opened with several micropores, and the micropores are selected from circular micropores, oval micropores, rhombus micropores or square micropores.

A further improvement of the present invention is that several ball-socket/spherical-convex heat exchange structures are evenly distributed on the outer diameter surface of the sealing structure.

The further improvement of the present invention lies in that the ball-and-socket/spherical-convex heat exchange structures are arranged in parallel or staggered rows, and the shape is spherical, ellipsoidal or teardrop-shaped.

The present invention has following beneficial technical effect:

The invention provides a fishbone imitation dry gas sealing structure, which includes a moving ring and a static ring. The outer diameter side of the moving ring and the static ring end face is the seal inlet, that is, the high pressure side, and the inner diameter side is the seal outlet, that is, the low pressure side. On the high pressure side of at least one end surface of the moving ring and the static ring, imitation herringbone grooves are evenly distributed along the circumference. The non-opening area between the circumferentially adjacent imitation fishbone grooves is a sealing weir, and an annular sealing dam is arranged under the imitation fishbone grooves. The fishbone imitation dry gas sealing structure adopted in the present invention can rotate in both directions, has strong opening ability, uniform pressure distribution on the end face, low end face temperature, small leakage and strong stability.

Further, in the present invention, the imitation fishbone groove is symmetrical about the central axis, adapts to the working condition of bidirectional rotation, and has good sealing performance in forward rotation and reverse rotation; the radial drainage groove is convergent, which can enhance the dynamic pressure effect, Improve the lubrication state of the sealing end face; the imitation fishbone groove has multiple spiral groove structures distributed along the radial direction, forming multiple high-pressure areas in the radial direction. Compared with the general dry gas seal, the dynamic pressure effect is significantly enhanced and the opening ability is enhanced; the seal When rotating, the positive spiral groove can form a significant dynamic pressure effect, and the reverse spiral groove can send the working fluid in the sealing gap back to the high pressure side, reducing the leakage; the arc groove at the "fishtail" can make the circumferential pressure of the sealing end face Balanced distribution, reducing the influence of force and deformation, while enhancing the sealing stability;

Further, in the present invention, the circular arc groove between two adjacent spiral grooves imitating fishbone grooves in the circumferential direction can make the circumferential pressure distribution of the sealing end face uniform, reduce the influence of force deformation, and enhance the sealing stability at the same time; the circular arc groove The circumferential flow of gas in the middle enhances the damping effect of the end face and reduces the leakage;

Further, in the present invention, the directional large holes arranged at the downstream position of the spiral groove play the role of diversion, and can absorb solid particles, reducing the risk of seal damage;

Further, the sealing dam of the present invention is arranged with a microporous structure, which can absorb solid particles, and enhance heat transfer in the inner diameter area of the seal, reduce the temperature of the sealing end face, and reduce the influence of thermal deformation;

Further, the outer diameter of the sealing ring of the present invention is arranged with a ball socket/spherical convex heat exchange structure, which enhances the heat exchange of the sealing ring, reduces the temperature of the sealing end surface, and reduces the influence of thermal deformation;

Further, the parameters of each helical groove in the present invention can be flexibly adjusted to adapt to different working conditions.

To sum up, the fishbone imitation dry gas seal structure described in the present invention can significantly improve the opening ability of the sealing end face, reduce the temperature of the end face, reduce the leakage, improve the stability, and reduce the deformation of the sealing end face, and is suitable for positive In the case of forward or reverse rotation.

Description of drawings

Fig. 1 is a schematic diagram of a fishbone-like dry gas seal structure according to the present invention.

Fig. 2 is the appearance diagram of the imitation fishbone groove of the present invention.

Fig. 3 is a cross-sectional view of the equal depth imitation fishbone groove of the present invention.

Fig. 4 is a cross-sectional view of a stepped fishbone imitation groove of different depths according to the present invention.

Fig. 5 is a sectional view of a tapered unequal-depth imitation fishbone groove of the present invention.

Fig. 6 is a schematic diagram of the linear drainage groove of the present invention.

Fig. 7 is a schematic diagram of the arc drainage groove of the present invention.

Fig. 8 is a schematic diagram of the spiral drainage groove of the present invention.

Fig. 9 is a schematic diagram of the wave drainage tank of the present invention.

Fig. 10 is a schematic diagram of the directional macropore of the present invention.

Fig. 11 is a schematic diagram of micropores of the present invention.

Fig. 12 is a schematic diagram of the outer diameter arrangement of the ball-socket/ball-convex structure of the sealing ring of the present invention.

Fig. 13 is a schematic diagram of a ball-socket/ball-convex structure arranged in a row.

Fig. 14 is a schematic diagram of a ball-socket/ball-convex structure arranged in a staggered arrangement.

Fig. 15 is a schematic diagram of a spherical socket/convex.

Fig. 16 is a schematic diagram of an ellipsoidal socket/convex.

Figure 17 is a schematic diagram of a teardrop-shaped socket/convex.

In the figure: 1 is the radial drainage groove, 2 is the forward spiral groove, 3 is the reverse spiral groove, 4 is the sealing weir, 5 is the arc groove, 6 is the directional large hole, and 7 is the "fishtail" combined groove , 8 is a sealing dam, 9 is a micropore, 10 is a ball-and-socket/spherical-convex heat exchange structure, 21 is the first helical line, 22 is the first arc line, 23 is the second arc line, and 31 is the second helix Line, 32 is the third circular arc line, 33 is the fourth circular arc line, 61 is the oval large hole, 62 is the rhombus large hole, 71 is the fifth circular arc line, 72 is the third spiral line, and 73 is the sixth Arc line, 74 is the fourth spiral line, 75 is the seventh arc line, 91 is a circular microhole, 92 is an oval microhole, 93 is a rhombus microhole, 94 is a square microhole, 101 is the first arc Line 102 is the second arc, 103 is the first straight line, and 104 is the second straight line.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings. However, it should not be understood that the scope of the above-mentioned subject matter of the present invention is limited only to the following content. Without departing from the above idea of the present invention, various replacements or changes made according to common technical knowledge and customary means in this field shall be included in the scope of the present invention.

Referring to Fig. 1, the present invention provides a fishbone-like dry gas seal structure, including a moving ring and a static ring. The outer diameter side of the moving ring and the static ring end face is the seal inlet, that is, the high pressure side, and the inner diameter side is the seal outlet, that is, the low pressure side. On the high pressure side of at least one end surface of the moving ring and the static ring, imitation fishbone grooves are periodically arranged along the circumferential direction. The fishbone-like groove is composed of a radial drainage groove 1, a forward spiral groove 2, a reverse spiral groove 3 and a "fishtail" combined groove 7. The radial drainage groove 1 converges in the radial direction, and is connected with the forward spiral groove 2, the reverse spiral groove 3 and the "fishtail" combined groove 7, and they are all symmetrical about the central axis. The forward spiral groove 2 and the reverse spiral groove 3 show a trend of first increasing and then decreasing along the radial direction from the high pressure area to the low pressure area, and the spiral groove in the middle of the sealing end face is the largest. The "fishtail" combination groove 7 is composed of spiral grooves and arc grooves symmetrical about the central axis. Adjacent helical grooves adjacent to the fishbone-like grooves in the circumferential direction are connected by arc grooves 5 . Directional large holes 6 are arranged downstream of the forward spiral groove 2 and the reverse spiral groove 3 . The non-opening area between the circumferentially adjacent imitation herringbone grooves is a sealing weir 4, and an annular sealing dam 8 is arranged below the imitating herringbone grooves. Microholes 9 are arranged on the sealing dam 8 .

Referring to Figure 2, the imitation fishbone groove includes a radial drainage groove 1, a forward spiral groove 2, a reverse spiral groove 3 and a "fishtail" combined groove 7. The profile of the forward spiral groove 2 is composed of a first helical line 21 , a first arc line 22 and a second arc line 23 . Correspondingly, the profile of the reverse spiral groove 3 is composed of the second helical line 31 , the third arc line 32 and the fourth arc line 33 . The profile of the "fishtail" combination groove 7 is composed of a fifth arc line 71 , a third helix line 72 , a sixth arc line 73 , a fourth helix line 74 and a seventh arc line 75 . Further, referring to Fig. 3, Fig. 4 and Fig. 5, the fishbone-like grooves can be set in different types, such as equal-depth grooves, stepped grooves of unequal depth, conical grooves of unequal depth, etc.

Referring to FIG. 6 , the linear radial drainage groove 1 is composed of a first arc 101 , a second arc 102 , a first straight line 103 and a second straight line 104 . Wherein, the first straight line 103 and the second straight line 104 are symmetrical about the central axis. Referring to Fig. 7, Fig. 8 and Fig. 9, the radial drainage grooves can also be arranged in other types, such as arc drainage grooves, spiral drainage grooves, and wave drainage grooves.

Referring to FIG. 10 , the directional large holes 6 can be in the form of elliptical large holes 61 , diamond-shaped large holes 62 and the like.

Referring to FIG. 11 , the microholes 9 can be in the form of circular microholes 91 , oval microholes 92 , diamond-shaped microholes 93 and square microholes 94 .

Referring to FIG. 12 , a ball-and-socket/spherical-convex heat exchange structure 10 is arranged on the outer diameter surface of the sealing ring. Referring to Fig. 13, Fig. 14, Fig. 15, Fig. 16 and Fig. 17, the ball-and-socket/spherical-convex heat exchange structure 10 can have different arrangements and shapes. Ball shape, teardrop shape, etc.

The working principle of the present invention is as follows:

In the working state, the sealing working fluid flows into the sealing end surface from the high pressure area on the outer diameter side, and the drainage effect of the radial drainage groove 1 quickly introduces the sealing working medium into the end surface, and the convergent structure produces a strong compression effect on the sealing working fluid. Due to the rotation of the moving ring, the sealing working fluid enters the forward spiral groove 2 step by step in the radial direction, and is compressed, and the pressure rises rapidly, forming multiple high-pressure areas on the sealing end face. The reverse spiral groove 3 sends part of the gas downstream of the seal back to the high pressure side to reduce leakage. The circular arc groove 5 between the roots of adjacent spiral grooves of two adjacent fishbone-shaped grooves in the circumferential direction makes the circumferential pressure distribution of the end surface more uniform and improves the lubrication of the end surface. The directional micropores at the downstream position of the spiral groove 5 play a drainage role and can adsorb solid particles in the gas. The combined structure of the "fishtail" combined groove 7 imitating the fishbone groove and the circular arc groove 5 further distributes the pressure on the end face evenly. The microporous structure arranged in the sealing dam area can further absorb solid particles and cool the sealing end face.

Claims (10)

1. a kind of imitative fish bone well dry gas sealing structure, which is characterized in that including rotating ring and stationary ring；Wherein, rotating ring and stationary ring end face Outside diameter be sealing import, i.e. high-pressure side, internal side diameter is that sealing exports, i.e. low-pressure side；Rotating ring and at least one end face of stationary ring On high-pressure side be uniformly distributed circumferentially several imitative fish-bone type grooves；Non- aperture area between circumferentially-adjacent two imitative fish-bone type grooves Domain is sealing weir (4), and the seals dam (8) of annular is equipped with below imitative fish-bone type groove.

2. a kind of imitative fish bone well dry gas sealing structure according to claim 1, which is characterized in that each imitative fish-bone type groove is equal Including radial conduction slot (1), and the transport screw slot (2), reverse acting spiral slot (3) and " fish that are connected with radial conduction slot (1) Tail " combination slot (7)；Radial conduction slot (1) is radially restrained, and transport screw slot (2) and reverse acting spiral slot (3) are about radial conduction The central axes of slot (1) are symmetrical, are connected to the both sides of radial conduction slot (1), transport screw slot (2) and reverse acting spiral slot (3) are along diameter To being in first increases and then decreases variation tendency from higher-pressure region to low-pressure area, the helicla flute in the middle part of seal face is maximum；" fish tail " group It is symmetrical about the central axes of radial conduction slot (1) to close slot (7).

3. a kind of imitative fish bone well dry gas sealing structure according to claim 2, which is characterized in that radial conduction slot (1) Profile includes being sequentially connected the first camber line (101), first straight line (103), the second camber line (102) and second straight line (104), and the One straight line (103) and second straight line (104) are symmetrical about central axes.

4. a kind of imitative fish bone well dry gas sealing structure according to claim 2, which is characterized in that transport screw slot (2) Profile includes sequentially connected first circular arc line (22), the first helix (21) and the second circular arc line (23), reverse acting spiral slot (3) Profile include sequentially connected third circular arc line (32), the second helix (31) and the 4th circular arc line (33)；" fish tail " combines The profile of slot (7) includes sequentially connected 5th circular arc line (71), third helix (72), the 6th circular arc line (73), the 4th spiral shell Spin line (74) and the 7th circular arc line (75).

5. a kind of imitative fish bone well dry gas sealing structure according to claim 2, which is characterized in that circumferentially-adjacent two imitative fishes It is connected by arc groove (5) between the adjacent grooves of bone type groove.

6. a kind of imitative fish bone well dry gas sealing structure according to claim 2, which is characterized in that transport screw slot (2) and Reverse acting spiral slot (3) downstream position arranges directional macropore (6), and directionality macropore (6) select oval macropore (61) or Diamond shape macropore (62).

7. a kind of imitative fish bone well dry gas sealing structure according to claim 1, which is characterized in that the imitative fish-bone type groove is etc. Deep trouth, the ladder-like deep trouths such as not or cone angle convergence the type deep trouths such as not.

8. a kind of imitative fish bone well dry gas sealing structure according to claim 1, which is characterized in that seals dam (8) is uniformly opened Equipped with several micropores (9), micropore (9) selects round micropore (91), oval micropore (92), diamond shape micropore (93) or square micro- Hole (94).

9. a kind of imitative fish bone well dry gas sealing structure according to claim 1, which is characterized in that the outer diameter of the sealing structure Face is evenly equipped with several convex heat exchange structures of ball-and-socket/ball (10).

10. a kind of imitative fish bone well dry gas sealing structure according to claim 9, which is characterized in that the convex heat exchange knot of ball-and-socket/ball The arrangement in-line arrangement of structure (10) or wrong row, shape are ball-type, spheroid shape or teardrop shaped.