CN111379861A - Floating seal device for rotary machine and rotary machine - Google Patents

Abstract

The invention discloses a floating sealing device for a rotary machine and the rotary machine, wherein the rotary machine comprises a static body and a rotating body, the static body surrounds the rotating body, the rotary machine is provided with a high-pressure end and a low-pressure end, the floating sealing device comprises an annular body, the annular body is provided with a first end and a second end, the first end of the annular body is adjacent to the high-pressure end of the rotary machine, the second end of the annular body is adjacent to the low-pressure end of the rotary machine, the inner circumference of the annular body is provided with a groove, the groove extends from the end surface of the first end of the annular body to the second end of the annular body, the annular body surrounds between the static body and the rotating body, and the annular body is matched with the static body and can move along the radial direction of the annular body. The floating sealing device is not easy to wear and long in service life, and improves the sealing effect.

Description

Floating seal device for rotary machine and rotary machine

Technical Field

The invention relates to the technical field of sealing, in particular to a floating sealing device for a rotary machine and the rotary machine.

Background

In a rotary machine such as a compressor or a turbine of a gas turbine, a fluid is generally sealed to reduce leakage and ensure normal operation of the rotary machine. In the related art, the interstage and shaft end of a compressor or a component in a turbine of a gas turbine are generally sealed by a labyrinth to control the flow of air in a cavity from a high-pressure area to a low-pressure area and prevent the air flow in a main flow channel from invading into the cavity, namely, the sealing effect is realized.

However, the sealing clearance between the conventional labyrinth seal and the rotating body is large, so that the leakage amount of gas is large. Meanwhile, because the rotor is easy to generate radial run-out and axial vortex motion when rotating at high speed, the labyrinth seal is easy to rub and collide with the rotor, thereby leading the labyrinth seal and the rotor surface to be worn, and reducing the sealing effect.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention provides a floating sealing device for a rotary machine, which is not easy to wear, has long service life and improves the sealing effect.

The invention further provides a rotary machine.

According to an embodiment of a first aspect of the present invention, a floating seal device for a rotary machine includes a stationary body and a rotating body, the stationary body surrounding the rotating body, the rotary machine having a high-pressure end and a low-pressure end, the floating seal device including an annular body having a first end and a second end, the first end of the annular body being adjacent to the high-pressure end of the rotary machine, the second end of the annular body being adjacent to the low-pressure end of the rotary machine, the inner periphery of the annular body having a groove extending from an end surface of the first end of the annular body toward the second end of the annular body, the annular body surrounding between the stationary body and the rotating body, the annular body being fitted with the stationary body and movable in a radial direction of the annular body.

According to the floating sealing device for the rotary machine, the groove is formed in the inner circumferential surface of the annular body, so that the floating sealing device is not easy to wear, long in service life and improved in sealing effect.

In some embodiments, the groove is spaced apart from an end face of the second end of the annular body.

In some embodiments, the direction of extension of the groove is arranged obliquely with respect to the axial direction of the annular body.

In some embodiments, the grooves are inclined at an angle of 0 ° to 90 °.

In some embodiments, the groove is recessed from the inner circumferential surface of the annular body by a depth of 1 to 50 μm.

In some embodiments, the groove has a plurality of grooves spaced circumferentially along the annular body.

In some embodiments, the groove is a linear groove.

In some embodiments, the grooves are elongated in cross-section.

In some embodiments, the groove has a plurality of grooves, the plurality of grooves are uniformly spaced along the circumferential direction of the annular body, the extending direction of each groove is obliquely arranged relative to the axial direction of the annular body, and the inclination angles of the plurality of grooves are the same and the inclination directions are the same.

In some embodiments, the floating seal device further includes a first extension portion extending outward in a radial direction of the annular body from an outer peripheral surface of the annular body, and a second extension portion extending outward in an axial direction of the annular body from an outer end of the first extension portion, and the inner peripheral surface of the stationary body has a catching groove, and the second extension portion is fitted in the catching groove and is movable in the catching groove in the radial direction of the annular body.

A rotary machine according to an embodiment of a second aspect of the present invention includes: the inlet guide vane assembly comprises guide vanes and an inner ring, and the outer peripheral surface of the inner ring is connected with the guide vanes; a rotor, the inner ring surrounding and spaced from the rotor; a movable blade provided on the rotor, the movable blade and the guide blade being opposed to and spaced apart from each other in an axial direction of the rotor; the floating sealing device is arranged between the inner ring and the rotor, and airflow can enter a gap between the movable blade and the guide blade through the floating sealing device to seal the gap, wherein the floating sealing device comprises an annular body, the inner circumferential surface of the annular body is provided with a groove, the groove extends from the end surface of one end, away from the movable blade, of the annular body to one end, close to the movable blade, of the annular body, the annular body is wound between the inner ring and the rotor, and the annular body is matched with the inner ring and can move in the radial direction of the annular body.

In some embodiments, the grooves are arranged at equal intervals along the circumferential direction of the annular body, the extending direction of the grooves is inclined relative to the axial direction of the annular body, the inclination angle of the grooves is 0-90 °, and the inclination angles of the grooves are the same and the inclination directions are the same.

In some embodiments, the groove is recessed into the inner circumferential surface of the annular body by a depth of 1 to 50 μm, and the cross section of the groove is elongated.

In some embodiments, the floating seal device further includes a first extension portion extending outward in a radial direction of the annular body from an outer peripheral surface of the annular body, and a second extension portion extending outward in an axial direction of the annular body from an outer end of the first extension portion, an inner peripheral surface of the inner ring is provided with a snap groove, and the second extension portion is fitted in the snap groove and is movable in the snap groove in the radial direction of the annular body.

Drawings

Fig. 1 is a schematic structural view of a rotary machine according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of a floating seal device for a rotary machine according to an embodiment of the present invention.

Fig. 3 is a sectional view a-a of fig. 2 of a floating seal arrangement according to an embodiment of the present invention.

Reference numerals:

the sealing device comprises a static body (inlet guide vane assembly) 1, a clamping groove 10, guide vanes 11, an inner ring 12, a rotating body (rotor) 2, a floating sealing device 3, an annular body 31, a groove 310, a first extending part 32, a second extending part 33 and a movable vane 4.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

A rotary machine and a floating seal device for a rotary machine according to an embodiment of the present invention will be described with reference to fig. 1 to 3.

As shown in fig. 1, a rotary machine according to an embodiment of the present invention includes a stationary body 1, a rotor 2, and a floating seal device 3, the stationary body 1 surrounding the rotor 2, the rotary machine having a high-pressure end (left end shown in fig. 1) and a low-pressure end (right end shown in fig. 1), the floating seal device 3 surrounding between the stationary body 1 and the rotor 2, and the floating seal device 3 provided on an inner peripheral surface of the stationary body 1. Thus, the air flow can flow from the side of the stationary body 1 adjacent to the high-pressure end to the side of the stationary body 1 adjacent to the low-pressure end through the floating seal device 3 (as indicated by the arrow shown in fig. 1, the air flow can flow from the left side of the stationary body 1 to the right side of the stationary body 1 through the floating seal device 3).

A floating seal device 3 for a rotary machine according to an embodiment of the present invention is described below.

As shown in fig. 1 to 3, a floating seal device 3 for a rotary machine according to an embodiment of the present invention includes an annular body 31, the annular body 31 being surrounded between a stator 1 and a rotor 2, and the annular body 31 being fitted to an inner peripheral surface of the stator 1. Wherein the annular body 31 has a first end and a second end, the first end of the annular body 3 being adjacent to a high pressure end of the rotary machine, such as the left end of the annular body 3 shown in fig. 1, 3, and the second end of the annular body 3 being adjacent to a low pressure end of the rotary machine, such as the right end of the annular body 3 shown in fig. 1, 3. The inner peripheral surface of the annular body 31 has a groove 310, and the groove 310 extends from an end surface of a first end of the annular body 31 (a left end surface of the annular body 31 shown in fig. 1 and 3) toward a second end of the annular body 31.

When the air flow passes through the floating seal device 3 having the above-described groove 310, since the groove 310 forms a convergent gap in the circumferential direction of the ring-shaped body 31, the floating seal device 3 generates a dynamic pressure effect and floats under the rotational motion of the rotor 2, and the floating seal device 3 does not contact the outer circumferential surface of the rotor 2, preventing the generation of rubbing. When the rotary machine starts to operate, the floating seal device 3 gradually increases the seal gap between the floating seal device 3 and the rotor 2 by the buoyancy generated by the dynamic pressure effect, and the increased seal gap also affects the dynamic pressure effect, so that the dynamic pressure effect is weakened by the increased seal gap, the buoyancy is reduced, the seal gap starts to be reduced, and finally, the balance state is achieved. Therefore, the process of automatically adjusting the sealing gap can be realized through the floating sealing device 3, and leakage is reduced.

According to the floating seal device 3 for the rotary machine, the groove 310 is formed in the inner circumferential surface of the annular body 31, and the floating seal device is a clearance type circumferential seal, the seal can adapt to radial runout and axial whirling of the rotating rotor 2 to move radially, so that frictional wear caused by hard contact between the floating seal device 3 and the rotating rotor 2 which may occur is eliminated, control over a seal clearance during operation of the floating seal device is guaranteed, and leakage is reduced. Moreover, by arranging the groove, the problem that the contact friction between the sealing device and the rotating body is difficult to avoid due to low gas viscosity and small dynamic pressure effect is solved, and the service life of the sealing device is prolonged.

In some specific embodiments, the groove 310 is spaced apart from an end face of the second end of the annular body 31 (the right end face of the annular body 31 shown in fig. 3). In other words, as shown in fig. 3, the groove 310 does not extend to the right end face of the groove 310, i.e., the right end face of the groove 310 is spaced apart from the right end face of the ring body 31 by a certain distance.

In some embodiments, the extending direction of the groove 310 is disposed obliquely with respect to the axial direction of the annular body 31. In other words, the groove 310 does not extend horizontally but is inclined at a predetermined angle with respect to the horizontal direction, and the groove 310 is inclined at a predetermined angle upward with respect to the horizontal direction in the cross section shown in fig. 3. Specifically, the inclination angle of the groove 310 is 0 ° to 90 °.

It can be understood that by providing the inclined grooves 310 on the inner circumferential surface of the annular body 31, the dynamic pressure effect can be increased, a large buoyancy force is generated, and the adjustment of the sealing gap between the floating seal device 3 and the rotor 2 is further facilitated.

In some embodiments, the groove 310 is a straight groove. In other words, as shown in fig. 3, the side wall surfaces of the groove 310 are all straight lines.

In some embodiments, the recess 310 is recessed from the inner circumferential surface of the annular body 31 by a depth of 1 to 50 μm.

In some embodiments, the groove 310 is provided in plurality, and the plurality of grooves 310 are arranged at intervals along the circumference of the annular body 31. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Further, the plurality of grooves 310 are uniformly spaced along the circumferential direction of the annular body 31, i.e., the distance between two adjacent grooves 310 is the same. Further, the plurality of grooves 310 are inclined at the same angle and in the same direction with respect to the axial direction of the annular body 31. In other words, each groove 310 is inclined toward the same direction and at the same angle with respect to the axial direction of the annular body 31.

In some embodiments, the grooves 310 are elongated in cross-section. In other words, as shown in fig. 3, the extension length of the groove 310 is greater than the length of the groove 310 in the circumferential direction of the annular body 31.

In some embodiments, the stationary body 1 has the card slot 10, and the floating seal device 3 further includes a first extension 32 and a second extension 33, the first extension 32 extending outward from the outer circumferential surface of the annular body 31 in the radial direction of the annular body 31, the second extension 33 extending outward from the outer end of the first extension 32 in the axial direction of the annular body 31, and the second extension 33 being fitted in the card slot 10 and movable in the card slot 10 in the radial direction of the annular body 31.

In other words, as shown in fig. 1 and 3, the first extending portion 32 extends from the outer peripheral surface of the annular body 31 in a direction away from the center of the annular body 31 in the radial direction of the annular body 31, the second extending portion 33 extends from the outer peripheral surface of the first extending portion 32 at the end away from the annular body 31 in the left-right direction in a direction away from the center of the first extending portion 32, that is, the axial direction of the second extending portion 33 coincides with the axial direction of the annular body 31, and the second extending portion 33 and the annular body 31 are opposed to each other in the radial direction of the annular body 31 and are spaced apart from each other by the first extending portion 32. Wherein the second extending portion 33 is fitted in the bayonet groove 10 of the inner peripheral surface of the stationary body 1 and is movable in the radial direction of the annular body 31 in the bayonet groove 10. In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

A rotary machine according to an embodiment of the invention is described below with reference to fig. 1.

As shown in fig. 1, the rotary machine according to the embodiment of the present invention includes an inlet guide vane assembly 1, a rotor 2, a movable vane 4, and a floating seal device 3, the inlet guide vane assembly 1 includes a guide vane 11 and an inner ring 12, an outer circumferential surface of the inner ring 12 is connected to the guide vane 11, and the inner ring 12 is wound around the rotor 2 and spaced apart from the rotor 2. Specifically, the inlet guide vane assembly 1 is disposed coaxially with the rotor 2.

The moving blade 4 is provided on the rotor 2, i.e., connected to the outer surface of the rotor 2, and the moving blade 4 and the guide blade 11 are opposed to and spaced apart from each other in the axial direction (the left-right direction shown in fig. 1) of the rotor 2;

a floating seal 3 is provided between the inner ring 12 and the rotor 2, through which floating seal 3 a gas flow may enter the gap between the moving blades 4 and the guide vanes 11 (as indicated by the arrows in fig. 1) to seal the gap. As shown in fig. 2 and 3, the floating seal device 3 includes an annular body 31, an inner peripheral surface of the annular body 31 is provided with a groove 310, the groove 310 extends from an end surface of the annular body 31 remote from one end of the movable blade 4 (a left end surface of the annular body 31 shown in fig. 1 and 3) toward one end of the annular body 31 adjacent to the movable blade 4 (a right end surface of the annular body 31 shown in fig. 1 and 3), the annular body 31 is provided around between the inner ring 12 and the rotor 2, and the annular body 31 is fitted with the inner ring 12 and is movable in a radial direction of the annular body 31. It will be appreciated that in this embodiment, the floating seal device 3 for a rotary machine of the previous embodiment is installed between the inlet guide vane assembly 1 and the rotor 2.

In some specific embodiments, the grooves 310 are spaced apart from an end surface (a right end surface of the annular body 31 shown in fig. 1 and 3) of the annular body 31 adjacent to one end of the movable blades 4, the grooves 310 are linear grooves and have a long strip shape, an extending direction of the grooves 310 is inclined by a predetermined angle of 0 ° to 90 ° with respect to an axial direction of the annular body 31, and a depth of each groove 310 recessed into an inner circumferential surface of the annular body 31 is 1 μm to 50 μm.

In some specific embodiments, the groove 310 has a plurality of grooves 310, the plurality of grooves 310 are uniformly spaced along the circumference of the annular body 31, and the inclination angle of each groove 310 is the same and the inclination direction is the same.

In some specific embodiments, the inner circumferential surface of the inner ring 12 has the card slot 10, the floating seal device 3 further includes a first extension portion 32 and a second extension portion 33, the first extension portion 32 extends outward from the outer circumferential surface of the annular body 31 in the radial direction of the annular body 31, the second extension portion 33 extends outward from the outer end of the first extension portion 32 in the axial direction of the annular body 31, and the second extension portion 33 is fitted in the card slot 10 and is movable in the card slot 10 in the radial direction of the annular body 31.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (14)

1. The utility model provides a floating seal device for rotary machine, rotary machine includes quiet body and rotor, quiet body encircles the rotor, rotary machine has high-pressure end and low pressure end, a serial communication port, floating seal device includes annular body, annular body has first end and second end, annular body's first end is close rotary machine's high-pressure end, annular body's second end is close rotary machine's low pressure end, annular body's inner peripheral surface has a recess, the recess is followed the terminal surface orientation of annular body's first end annular body's second end extends, annular body encircle in quiet body with between the rotor, annular body with quiet body cooperatees and follows annular body's radial removal.

2. The floating seal arrangement for a rotary machine of claim 1 wherein said groove is spaced from an end face of said second end of said annular body.

3. The floating seal device for a rotary machine according to claim 1, wherein an extending direction of the groove is disposed obliquely with respect to an axial direction of the annular body.

4. A floating seal arrangement for a rotary machine according to claim 3 wherein the angle of inclination of the grooves is between 0 ° and 90 °.

5. The floating seal device for a rotary machine according to claim 1, wherein the groove is recessed into the inner peripheral surface of the annular body by a depth of 1 to 50 μm.

6. The floating seal arrangement for a rotary machine of claim 1 wherein said groove is plural, said plural grooves being spaced circumferentially of said annular body.

7. The floating seal assembly for a rotary machine of claim 1, wherein said groove is a straight groove.

8. The floating seal for a rotary machine of claim 7 wherein said groove is elongated in cross-section.

9. The floating seal device for a rotary machine according to claim 1, wherein said groove has a plurality of grooves arranged at regular intervals in a circumferential direction of said annular body, an extending direction of each of said grooves is arranged obliquely with respect to an axial direction of said annular body, and an inclination angle of said plurality of grooves is the same and an inclination direction thereof is uniform.

10. The floating seal device for a rotary machine according to any one of claims 1 to 9, further comprising a first extension portion extending outward in a radial direction of the annular body from an outer peripheral surface of the annular body, and a second extension portion extending outward in an axial direction of the annular body from an outer end of the first extension portion, an inner peripheral surface of the stationary body having a catching groove, the second extension portion being fitted in the catching groove and movable in the radial direction of the annular body in the catching groove.

11. A rotary machine, comprising:

the inlet guide vane assembly comprises guide vanes and an inner ring, and the outer peripheral surface of the inner ring is connected with the guide vanes;

a rotor, the inner ring surrounding and spaced from the rotor;

a movable blade provided on the rotor, the movable blade and the guide blade being opposed to and spaced apart from each other in an axial direction of the rotor;

a floating seal device provided between the inner ring and the rotor, through which an air flow can enter a gap between the moving blade and the guide blade to seal the gap,

the floating sealing device comprises an annular body, wherein the inner circumferential surface of the annular body is provided with a groove, the groove extends from the end surface of one end, away from the movable blades, of the annular body to one end, close to the movable blades, of the annular body, the annular body is arranged between the inner ring and the rotor in a surrounding mode, and the annular body is matched with the inner ring and can move in the radial direction of the annular body.

12. The rotary machine of claim 11, wherein the plurality of grooves are evenly spaced along a circumferential direction of the annular body, an extending direction of the grooves is inclined with respect to an axial direction of the annular body, an inclination angle of the grooves is 0 ° to 90 °, and the plurality of grooves have the same inclination angle and the same inclination direction.

13. The rotary machine of claim 11, wherein the groove is recessed into the inner circumferential surface of the ring-shaped body by a depth of 1 to 50 μm, and the groove has a long bar-shaped cross section.

14. The rotary machine of any one of claims 11-13, wherein the floating seal device further includes a first extension portion extending radially outward of the annular body from an outer peripheral surface of the annular body, and a second extension portion extending axially outward of the annular body from an outer end of the first extension portion, an inner peripheral surface of the inner ring being provided with a catch groove, the second extension portion being fitted in the catch groove and movable radially of the annular body within the catch groove.

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