CN210890114U - Dry gas sealing structure with antler-like groove - Google Patents

Abstract

The utility model discloses a dry gas sealing structure with an imitated antler-shaped groove, which comprises a movable ring and a static ring which are oppositely arranged along the axial direction; the outer diameter side of the two is a high-pressure air inlet side, and the inner diameter side is a low-pressure air outlet side; a plurality of antler-like shaped grooves are uniformly distributed on at least one end surface of the movable ring and the static ring along the circumferential direction; each simulated antler-shaped groove comprises a positive antler-shaped groove and a reverse antler-shaped groove which are mutually symmetrical; wherein, the positive antler groove comprises a positive combined spiral groove and a positive single spiral groove group; the reverse antler groove comprises a reverse combined spiral groove and a reverse single spiral groove group; a non-opening area between two adjacent antler-shaped grooves in the circumferential direction is a sealing weir, and an annular sealing dam is arranged below the antler-shaped grooves; and a plurality of micropores with ridges are arranged on the sealing dam. The utility model discloses can show and promote the sealing end face opening ability, reduce the terminal surface temperature, reduce and let out leakage quantity, and easily processing, the expansibility is good, but two-way rotation etc. are showing the advantage, have wide market prospect.

Description

Dry gas sealing structure with antler-like groove

Technical Field

The utility model relates to a dry gas seal structure with imitative deer horn type groove is applicable to various rotating machinery and seals.

Background

In the field of energy power, various power equipment develops towards the directions of high temperature, high pressure and high rotating speed, and the importance of the shaft end sealing problem of the rotating machinery is more and more highlighted. The traditional labyrinth seal, brush seal and other seals are difficult to be suitable for occasions with high temperature, high pressure and high rotating speed. As a non-contact type seal, the dry gas seal has the remarkable advantages of low leakage, small abrasion, long service life and the like, and becomes the best choice for the shaft end seal of the rotary machine. However, most of the dry gas seals widely applied at present are one-way rotary seals, and are not suitable for two-way rotary machines. The existing dry gas seal capable of rotating in two directions has the problems of weak dynamic pressure opening effect, high end surface temperature, large leakage amount and difficult processing caused by complex groove shape. Therefore, there is a need to develop a sealing structure suitable for bidirectional rotation that can enhance the opening capability, lower the end surface temperature, reduce the leakage amount, and facilitate processing.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a dry gas seal structure with imitative deer horn type groove, its dynamic pressure effect is obvious, opening ability is strong, can reduce terminal surface temperature, easily processing, expansibility are good, can be used to each rotating machinery and seal.

The utility model discloses a following technical scheme realizes:

a dry gas sealing structure with an imitated antler-shaped groove comprises a movable ring and a stationary ring which are oppositely arranged along the axial direction; the outer diameter side of the two is a high-pressure air inlet side, and the inner diameter side is a low-pressure air outlet side; a plurality of antler-like shaped grooves are uniformly distributed on at least one end surface of the movable ring and the static ring along the circumferential direction; each simulated antler-shaped groove comprises a positive antler-shaped groove and a reverse antler-shaped groove which are mutually symmetrical; wherein, the positive antler groove comprises a positive combined spiral groove and a positive single spiral groove group; the reverse antler groove comprises a reverse combined spiral groove and a reverse single spiral groove group; a non-opening area between two adjacent antler-shaped grooves in the circumferential direction is a sealing weir, and an annular sealing dam is arranged below the antler-shaped grooves; and a plurality of micropores with ridges are arranged on the sealing dam.

The utility model discloses further improvement lies in, and the helicla flute number in the single auger groove group in forward "deer horn" groove and the reverse "deer horn" groove is 1 ~ 5.

The utility model discloses further improvement lies in, and the circumference span between the adjacent helicla flute is the same in the single spiral flute group in forward "deer horn" groove and the reverse "deer horn" groove, and between 3 ~ 15.

The utility model discloses a further improvement lies in, and the base shape of the combination formula helicla flute in positive "deer horn" groove and reverse "deer horn" groove is second order or multistage bezier curve.

The utility model is further improved in that the micropores with ridges are arranged in sequence or in dislocation.

The utility model is further improved in that the micropore form of the ridged micropore is spherical, ellipsoidal or teardrop-shaped.

The utility model discloses further improvement lies in, the micropore extension ratio of taking the ridge is the ratio of following flow direction length and diameter promptly and is 1.1 ~ 1.9, and the depth diameter ratio is the ratio of degree of depth and diameter promptly and is 0.1 ~ 0.5.

The utility model discloses at least, following profitable technological effect has:

1) the simulated antler-shaped groove is composed of a plurality of spiral grooves, a plurality of high-pressure areas are formed on the sealing end face, the dynamic pressure effect is obviously enhanced, and the opening capacity is improved.

2) The bottom side form of the combined spiral groove is a Bessel curve, is a curve form which is mature in engineering application, and has the remarkable advantage of convenient processing compared with the complex groove form in the existing various bidirectional dry gas sealing structures. In addition, the number and the coordinates of the control points of the Bezier curve can be flexibly adjusted, so that the order and the shape of the Bezier curve can be flexibly adjusted, and the method is suitable for various working conditions and structures.

3) The spiral grooves in the simulated antler-shaped grooves are of a universal structure, the number and the size of the spiral grooves can be flexibly adjusted, the spiral grooves are suitable for various working conditions and structures, and large-area popularization and expansion are facilitated.

4) The ridged micropores form a ridge in the direction perpendicular to the leakage direction, so that the air flow disturbance is enhanced, and the dynamic pressure effect can be further enhanced. In addition, the ridge structure enhances gas disturbance, breaks a boundary layer, enhances heat exchange, reduces the temperature of the sealing end face, and is favorable for safe operation of sealing. Finally, the ridge micropores can also adsorb impurities of the sealing working medium, and the risk of damaging the sealing end face is reduced.

5) The form, arrangement mode, size and number of the ridged micropores can be flexibly adjusted, and the ridged micropores are suitable for various working conditions and structures.

6) The antler-like groove is symmetrical about the central axis and is suitable for the occasions of bidirectional rotation.

To sum up, a dry gas seal structure with imitative deer horn type groove, can show and promote the sealing end face opening ability, reduce terminal surface temperature, reduce and let out leakage quantity, and easily processing, the expansibility is good, is applicable to forward or reverse rotation's multiple occasion.

Drawings

Fig. 1 is a schematic view of a dry gas sealing structure with an artificial antler-shaped groove of the utility model.

Figure 2 is a shape chart of the antler-like groove of the utility model.

Fig. 3 is a schematic view of the shape of the bottom side of the combined spiral groove of the present invention, wherein fig. 3(a) is a schematic view of a bezier curve of each order, fig. 3(b) is a combined spiral groove whose bottom side is a second-order bezier curve, fig. 3(c) is a combined spiral groove whose bottom side is a third-order bezier curve, and fig. 3(d) is a combined spiral groove whose bottom side is a fourth-order bezier curve.

Fig. 4 shows the spiral groove sets with different groove numbers of the present invention, wherein fig. 4(a) shows 1 single spiral groove, fig. 4(b) shows 2 single spiral grooves, and fig. 4(c) shows 3 single spiral grooves.

Fig. 5 shows the spiral groove groups with different circumferential spans of the present invention, wherein fig. 5(a) is 5 °, fig. 5(b) is 10 °, and fig. 5(c) is 15 °.

Fig. 6 shows the ridged spherical micropores with different expansion ratios of the present invention, wherein fig. 6(a) shows the ridged micropores with an expansion ratio of 1.1, fig. 6(b) shows the ridged micropores with an expansion ratio of 1.5, and fig. 6(c) shows the ridged micropores with an expansion ratio of 1.9.

Fig. 7 is the spherical micropore with ridge of different aspect ratio of the present invention, wherein fig. 7(a) is a top view, fig. 7(b) is a cross-sectional view of fig. 7(a) a-a, and from left to right are the micro pore with ridge with depth diameter ratio of 0.1, the micro pore with ridge with depth diameter ratio of 0.3, and the micro pore with ridge with depth diameter ratio of 0.5.

Fig. 8 shows the ridged micro-holes of the present invention in different arrangements, wherein fig. 8(a) is a sequential arrangement and fig. 8(b) is a staggered arrangement.

Fig. 9 shows a different form of the present invention, in which fig. 9(a) shows an ellipsoidal ridge micropore and fig. 9(b) shows a teardrop ridge micropore.

Description of reference numerals:

the spiral groove comprises a forward combined spiral groove 1, a forward single spiral groove group 2, a reverse combined spiral groove 3, a reverse single spiral groove group 4, a sealing weir 5, a sealing dam 6 and a ridge micropore 7.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. It should not be understood that the scope of the above-described subject matter of the present invention is limited to the following. Various substitutions and alterations can be made according to the ordinary skill in the art and the conventional means without departing from the spirit of the invention.

Referring to fig. 1 and 2, the utility model provides a dry gas seal structure with imitative antler type groove, including the rotating ring and the quiet ring of arranging along the axial relative. The outer diameter side of the two is a high-pressure air inlet side, and the inner diameter side is a low-pressure air outlet side. A plurality of antler-like shaped grooves are uniformly distributed on at least one end surface of the movable ring and the static ring along the circumferential direction. Each simulated antler-shaped groove comprises a positive antler-shaped groove and a reverse antler-shaped groove which are symmetrical with each other. The positive direction 'antler' groove comprises a positive direction combined type spiral groove 1 and a positive direction single branch spiral groove group 2. The reverse 'antler' groove comprises a reverse combined spiral groove 3 and a reverse single spiral groove group 4. The non-perforated area between two adjacent antler-shaped grooves in the circumferential direction is a sealing weir 5, and an annular sealing dam 6 is arranged below the antler-shaped grooves. A plurality of ridged micro-holes 7 are arranged on the sealing dam 6.

Referring to fig. 3, the shapes of the bases of the forward combined type spiral groove 1 and the reverse combined type spiral groove 2 are second-order or multi-order bezier curves. Fig. 3(a) is a schematic view of each step of the bezier curve, fig. 3(b) is a combined type helicoidal groove whose base is a second-order bezier curve, fig. 3(c) is a combined type helicoidal groove whose base is a third-order bezier curve, and fig. 3(d) is a combined type helicoidal groove whose base is a fourth-order bezier curve.

Referring to fig. 4, the forward single helical groove group and the reverse single helical groove group have different groove numbers. Fig. 4(a) shows 1 single helical groove, fig. 4(b) shows 2 single helical grooves, and fig. 4(c) shows 3 single helical grooves.

Referring to FIG. 5, adjacent helical flutes differ in circumferential span. Fig. 5(a) is 5 °, fig. 5(b) is 10 °, and fig. 5(c) is 15 °.

Referring to FIG. 6, the expansion ratio of the ridged spherical micropores is 1.1 to 1.9. Fig. 6(a) shows a ridged pore having an expansion ratio of 1.1, fig. 6(b) shows a ridged pore having an expansion ratio of 1.5, and fig. 6(c) shows a ridged pore having an expansion ratio of 1.9.

Referring to fig. 7, the depth diameter ratio of the ridged spherical micropores is 0.1-0.5. Fig. 7(a) is a top view, and fig. 7(b) is a cross-sectional view taken along the direction a-a of fig. 7(a), and sequentially from left to right, a ridged pore having a depth-to-diameter ratio of 0.1, a ridged pore having a depth-to-diameter ratio of 0.3, and a ridged pore having a depth-to-diameter ratio of 0.5.

Referring to fig. 8, a different arrangement of ridged microholes. Fig. 8(a) shows a sequential arrangement, and fig. 8(b) shows a staggered arrangement.

Referring to fig. 9, a different shape of ridged microholes. Fig. 9(a) shows ellipsoidal ridged pores, and fig. 8(b) shows teardrop-shaped ridged pores.

The working principle of the utility model is as follows:

when the movable ring rotates in the positive direction, the sealing working medium on the high-pressure side of the outer diameter enters the positive combined spiral groove and the positive single-branch spiral groove group, the groove root is compressed, the pressure is rapidly increased, and a plurality of high-pressure areas are formed on the sealing end face. The reverse combined spiral groove and the reverse single spiral groove set send part of gas at the downstream of the seal back to the high-pressure side, and leakage amount is reduced. The sealing dam is provided with the ridge micropores, so that gas disturbance in a sealing gap is enhanced, the pressure in the groove is further improved, energy dissipation is enhanced, the temperature of the sealing end face is reduced, and impurities in a sealing working medium can be adsorbed. Through the combined action of the simulated antler-shaped groove and the ridged micropore, the dynamic pressure effect of the seal is enhanced, the temperature of the seal end face is reduced, and the leakage rate is obviously reduced.

Claims (7)

1. A dry gas sealing structure with an imitated antler-shaped groove is characterized by comprising a movable ring and a stationary ring which are oppositely arranged along the axial direction; the outer diameter side of the two is a high-pressure air inlet side, and the inner diameter side is a low-pressure air outlet side; a plurality of antler-like shaped grooves are uniformly distributed on at least one end surface of the movable ring and the static ring along the circumferential direction; each simulated antler-shaped groove comprises a positive antler-shaped groove and a reverse antler-shaped groove which are mutually symmetrical; wherein, the positive antler groove comprises a positive combined spiral groove (1) and a positive single spiral groove group (2); the reverse antler groove comprises a reverse combined spiral groove (3) and a reverse single spiral groove group (4); a non-opening area between two adjacent simulated antler-shaped grooves in the circumferential direction is a sealing weir (5), and an annular sealing dam (6) is arranged below the simulated antler-shaped grooves; a plurality of ridged micropores (7) are arranged on the sealing dam (6).

2. The dry gas sealing structure with the simulated antler-shaped groove according to claim 1, wherein the number of spiral grooves in a single spiral groove group in the forward direction 'antler' groove and the reverse direction 'antler' groove is 1-5.

3. The dry gas seal structure with simulated antler-shaped grooves according to claim 1, characterized in that the circumferential span between adjacent spiral grooves in a single spiral groove group in the forward and reverse "antler" grooves is the same and is between 3 ° and 15 °.

4. The dry gas seal structure with the simulated antler-shaped groove according to claim 1, wherein the combined spiral groove in the forward and reverse antler-shaped grooves has a shape of a second-order or multi-order Bessel curve at the bottom side.

5. The dry gas sealing structure with the simulated antler-shaped groove is characterized in that the ridged micropores (7) are arranged in sequence or in a staggered manner.

6. The dry gas sealing structure with the simulated antler-shaped groove according to claim 1 or 5, characterized in that the micropore form of the ridged micropores (7) is spherical, ellipsoidal or teardrop-shaped.

7. The dry gas sealing structure with the simulated antler-shaped groove according to claim 1, characterized in that the expansion ratio of the ridged micropores (7), namely the ratio of the length to the diameter along the flow direction, is 1.1-1.9, and the depth-to-diameter ratio, namely the ratio of the depth to the diameter, is 0.1-0.5.

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