CN211875109U

CN211875109U - Nested biax sealing device between axle

Info

Publication number: CN211875109U
Application number: CN202020134491.XU
Authority: CN
Inventors: 魏进; 何子钦
Original assignee: Shaanxi Polytechnic Institute
Current assignee: Shaanxi Polytechnic Institute
Priority date: 2020-01-20
Filing date: 2020-01-20
Publication date: 2020-11-06
Anticipated expiration: 2030-01-20

Abstract

The utility model discloses an inter-shaft sealing device of nested double shafts, which comprises an inner sealing pipe, an outer sealing pipe and a plurality of arched elastic pieces; the inner sealing pipe is nested in the outer sealing pipe, and an elastic sealing film is connected between the inner sealing pipe and the outer sealing pipe; a plurality of arch-shaped elastic sheets are uniformly arranged between the inner sealing pipe and the outer sealing pipe, and the arch tops of the arch-shaped elastic sheets face the central axis of the outer sealing ring. The utility model discloses the shaft sealing device of nested formula biax, make full use of the lubricated principle of gaseous dynamic pressure, realized non-contact's sealed design in interior axle and outer shaft within a definite time, the flexible construction of adoption can realize that the sealing ring can follow the precession or the eccentric runout of interior axle to reach the sealing ring and can radially realize unsteady purpose, non-contact's design makes the shaft sealing device of nested formula biax can reach long-life requirement.

Description

Nested biax sealing device between axle

Technical Field

The utility model relates to a mechanical seal field, concretely relates to shaft seal device of nested formula biax.

Background

In a double-rotor aero-engine or a gas turbine, a high-pressure rotor and a low-pressure rotor are connected through an intermediate bearing, two shafts are sleeved together, the shaft with the large diameter is sleeved on the high-pressure shaft with the small diameter, the rotating speed of the shaft with the large diameter is called as a high-pressure shaft, the rotating speed of the shaft with the small diameter is called as a low-pressure shaft, and the intermediate bearing is located between the high-pressure shaft and the low-pressure shaft and plays a supporting role. The seal for the intermediate bearing is the inter-shaft seal. Inter-shaft seals are difficult to handle due to their unique dimensional requirements and operating conditions. The existing labyrinth seal used between shafts causes increased gas leakage and serious efficiency loss after tooth tips are abraded.

Disclosure of Invention

In order to solve the technical problems, the main object of the present invention is to provide an inter-shaft sealing device of nested double shafts, which comprises an inner sealing pipe and an outer sealing pipe, wherein the inner sealing pipe is sleeved on an inner shaft of the nested double shaft, and the outer sealing pipe is installed in an outer shaft of the nested double shaft; the inner sealing tube of the device is arranged in the outer sealing tube in a floating mode through a plurality of arched elastic sheets, one end portions of the outer sealing tube and the inner sealing tube are used for blocking an inter-tube channel of the outer sealing tube and the inner sealing tube through elastic sealing films, and the inter-shaft sealing device of the nested double-shaft can achieve inter-shaft sealing of the inner shaft and the outer shaft.

In order to achieve the above purpose, the present invention adopts the following technical solution.

A nested biaxial shaft-to-shaft sealing device comprises an inner sealing pipe, an outer sealing pipe and a plurality of arched elastic sheets; the inner sealing pipe is nested in the outer sealing pipe, and an elastic sealing film is connected between the inner sealing pipe and the outer sealing pipe; a plurality of arch-shaped elastic sheets are uniformly arranged between the inner sealing pipe and the outer sealing pipe, and the arch tops of the arch-shaped elastic sheets face the central axis of the outer sealing pipe.

Furthermore, a plurality of arch-shaped elastic sheets are fixedly connected to the inner wall of the outer sealing pipe.

Furthermore, the elastic sealing membrane is provided with a plurality of circles of corrugation waves along the radial direction.

Furthermore, the elastic sealing film is made of high-temperature-resistant rubber or silica gel.

Further, the inner wall of the inner sealing pipe is provided with a sealing ring.

Furthermore, the material of the sealing ring is graphite.

Furthermore, the end part of the inner sealing pipe, which is far away from the elastic sealing membrane, extends radially inwards to form a check ring, the inner diameter of the check ring is between the inner diameter and the outer diameter of the sealing ring, and the check ring is used for blocking the sealing ring from moving towards the direction far away from the elastic sealing membrane.

Furthermore, the retainer ring is provided with an annular convex rib, and the end surface of the sealing ring is provided with an annular groove matched with the annular convex rib.

The utility model discloses the shaft sealing device of nested formula biax, make full use of the lubricated principle of gaseous dynamic pressure, realized non-contact's sealed design in interior axle and outer shaft within a definite time, the flexible construction of adoption can realize that the sealing ring can follow the precession or the eccentric runout of interior axle to reach the sealing ring and can realize unsteady purpose in the footpath. The non-contact design enables the nested double-shaft sealing device to meet the requirement of long service life.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic perspective view of one embodiment of a nested biaxial shaft-to-shaft seal arrangement;

FIG. 2 is a schematic perspective exploded view of one embodiment of a nested biaxial shaft to shaft seal arrangement;

FIG. 3 is a front view of one embodiment of a nested biaxial shaft to shaft seal arrangement;

FIG. 4 is a longitudinal cross-sectional view of one embodiment of a nested biaxial shaft-to-shaft seal arrangement;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

fig. 6 is a schematic view of a nested biaxial shaft-to-shaft sealing device applied to a dual rotor aircraft engine.

In the above figures:

1, sealing the tube in the tube; 101 a retainer ring; 102 annular convex ribs;

2, sealing the outer pipe; 3, an arched elastic sheet; 4 an elastic sealing film; 5, sealing rings; 501, an annular groove; 6, a high-pressure shaft; 7 low pressure shaft.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of other ways than those described herein, and those skilled in the art will be able to make similar generalizations without departing from the spirit of the invention. The invention is therefore not limited to the specific embodiments disclosed below.

The utility model provides an inter-shaft sealing device of nested double shafts, which refers to figures 1, 2, 3 and 4, and comprises an inner sealing pipe 1, an outer sealing pipe 2 and a plurality of arched elastic pieces 3; the inner sealing pipe 1 is nested in the outer sealing pipe 2, and an elastic sealing film 4 is connected between the inner sealing pipe 1 and the outer sealing pipe 2; a plurality of arch-shaped elastic sheets 3 are uniformly arranged between the inner sealing pipe 1 and the outer sealing pipe 2, and the arch tops of the arch-shaped elastic sheets 3 face the central axis of the outer sealing pipe 2.

The utility model discloses an interaxial sealing device of nested formula biax is applied to generally and has interior axle, outer axle, and on interior axle sleeve located the product in the outer axle. The outer shaft is typically a hollow shaft. In the above embodiments, the outer sealing tube 2 is typically installed in the outer shaft with an interference fit, and the inner sealing tube 1 is sleeved outside the inner shaft. Because the inner sealing tube 1 is nested in the outer sealing tube 2 in a floating mode through a plurality of arched elastic sheets 3, the outer shaft and the inner shaft rotate, the inner shaft can jump radially relative to the outer shaft, self-adaptive sealing can be achieved through the elastic sealing film 4 arranged between the outer sealing tube 2 and the inner sealing tube 1, and inter-shaft sealing between the outer shaft and the inner shaft is achieved. The elastic sealing film 4 is connected with the outer wall of the inner sealing tube 1 and the inner wall of the outer sealing tube 2, and the connection can be bonding. The quantity of arch shell fragment can increase and decrease according to actual demand, and the preferred spring steel of material of arch shell fragment.

Furthermore, the plurality of arched elastic sheets 3 are fixedly connected to the inner wall of the outer sealing pipe 2.

In the above embodiment, in order to uniformly distribute the arched elastic pieces 3 on the inner wall of the outer sealing pipe 2, the arched elastic pieces 3 are welded on the inner wall of the outer sealing pipe 2, and when the inner shaft drives the inner sealing pipe 1 to radially jump, the arched elastic pieces 3 deform to resist the radial jump of the inner shaft relative to the outer shaft.

Furthermore, the elastic sealing membrane 4 is provided with a plurality of circles of corrugation waves along the radial direction, the action of the corrugation waves enables the sealing membrane to be elastically stretched and deformed in a small range along the radial direction, the elasticity is suitable for the radial jumping of the inner sealing pipe 1, so that the elastic sealing membrane 4 is not torn and broken when the inner sealing pipe 1 floats along the radial direction, and the elastic sealing membrane 4 can be made of high-temperature-resistant rubber or silica gel.

Further, in order to increase the service life of the inner seal pipe 1, a seal ring 5 is provided on the inner wall of the inner seal pipe 1, and the material of the seal ring 5 is preferably graphite having lubricity. Graphite is selected for use because graphite has a lubricating effect, and even if the sealing ring 5 made of graphite is worn, the sealing ring can be reused by replacing a new sealing ring.

Further, referring to fig. 5, in order to block the sealing ring 5 from moving away from the elastic sealing film 4, the end of the inner sealing tube 1 away from the elastic sealing film 4 extends radially inwards to form a collar 101, and the inner diameter of the collar 101 is between the inner diameter and the outer diameter of the sealing ring 5. Since the inner diameter of the retainer ring 101 is between the inner diameter and the outer diameter of the seal ring 5, the low-pressure shaft 7 is prevented from contacting the retainer ring 101 and generating rigid friction.

Further, referring to fig. 5, an annular rib 102 is disposed on the retainer ring 101, and an annular groove 501 matched with the annular rib 102 is disposed on an end surface of the seal ring 5.

In the above embodiment, the annular rib 102 is disposed on the retainer ring 101, and the annular groove 501 is disposed on the corresponding end surface of the seal ring 5, so that on one hand, the seal ring 5 is positioned, on the other hand, the contact area between the seal ring 5 and the retainer ring 101 is increased, and in order to make the seal ring 5 not easily withdraw from the inner seal pipe 1, an adhesive may be applied between the seal ring 5 and the inner seal pipe 1.

Exemplary, the following is a specific application of the nested biaxial inter-shaft seal arrangement.

Referring to fig. 6, in the double-rotor aircraft engine or gas turbine, the high-pressure rotor and the low-pressure rotor are connected through an intermediate bearing, the two rotors are sleeved together, the shaft with the large diameter is sleeved with the shaft with the small diameter, the rotating speed of the shaft with the large diameter is called as a high-pressure shaft 6, the rotating speed of the shaft with the small diameter is called as a low-pressure shaft 7, and the intermediate bearing is positioned between the high-pressure shaft 6 and the low-pressure shaft 7 and plays a role of supporting. The seal for the intermediate bearing is the inter-shaft seal.

The outer sealing pipe 2 is arranged in the high-pressure shaft 6 in an interference fit mode, and the inner sealing pipe 1 is sleeved outside the low-pressure shaft 7. In an ideal state, the three lines of the central line of the high-pressure shaft 6, the central line of the low-pressure shaft 7 and the central line of the sealing ring 5 are coincident, in practice, when the high-pressure rotor and the low-pressure rotor rotate, namely, when the high-pressure shaft 6 and the low-pressure shaft 7 rotate, the central lines are not always coincident, and if the center of the high-pressure shaft 6 on the outer layer is taken as a reference, the low-pressure shaft 7 on the inner layer has axis whirling motion. When the low-pressure shaft 7 of the inner layer has precession or radial eccentric runout, the low-pressure shaft 7 of the inner layer and the sealing ring 5 generate an eccentric distance to form a convergent gap similar to a sliding bearing, and gas is driven by a solid wall surface to form gas dynamic pressure lubrication, so that the inner cylindrical surface of the sealing ring 5 and the surface of the low-pressure shaft 7 of the inner layer are ensured not to generate contact friction. Similarly, if the center of the low pressure shaft 7 of the inner layer is used as a reference, the precession or radial eccentric runout of the high pressure shaft 6 of the outer layer is supported and transmitted to the sealing ring 5 by the outer sealing pipe 2 and the arched elastic sheet 3, and the sealing ring 5 and the low pressure shaft 7 of the inner layer also generate an eccentric distance to form dynamic pressure gas lubrication. The flexible design accommodates the radial run-out of the high-pressure shaft 6 and the low-pressure shaft 7, and ensures that no contact friction is generated between the sealing ring 5 and the low-pressure shaft 7 of the inner layer.

The utility model discloses the shaft sealing device of nested formula biax, make full use of the lubricated principle of gaseous dynamic pressure, realized non-contact's sealed design between outer axle and interior, the flexible construction of adoption can realize that the sealing ring follows the precession or the eccentric runout of interior axle to reach the sealing ring and can realize unsteady purpose in the footpath. The non-contact design enables the nested double-shaft sealing device to meet the requirement of long service life.

Although the invention has been described in detail in this specification with reference to specific embodiments and illustrative embodiments, it will be apparent to those skilled in the art that certain changes and modifications can be made therein without departing from the scope of the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A nested biaxial shaft-to-shaft sealing device is characterized by comprising an inner sealing pipe (1), an outer sealing pipe (2) and a plurality of arched elastic sheets (3);

the inner sealing pipe (1) is nested in the outer sealing pipe (2), and an elastic sealing film (4) is connected between the inner sealing pipe (1) and the outer sealing pipe (2);

a plurality of arch-shaped elastic sheets (3) are uniformly arranged between the inner sealing pipe (1) and the outer sealing pipe (2), and the arch tops of the arch-shaped elastic sheets (3) face the central axis of the outer sealing pipe (2).

2. The biaxial shaft seal assembly as defined in claim 1, wherein a plurality of dome-shaped elastic pieces (3) are fixedly attached to the inner wall of the outer seal pipe (2).

3. The biaxial shaft-to-shaft sealing device as defined in claim 1, wherein the elastic sealing film (4) is provided with a plurality of turns of corrugation in the radial direction.

4. The nested biaxial shaft-to-shaft sealing device according to claim 1, wherein the elastic sealing film (4) is made of high temperature resistant rubber or silicone rubber.

5. The biaxial shaft-to-shaft sealing device as defined in claim 1, wherein the inner wall of the inner seal tube (1) is provided with a seal ring (5).

6. The shaft-to-shaft sealing device of nested twin shafts according to claim 5, characterized in that the material of the sealing ring (5) is graphite.

7. The nested biaxial shaft-to-shaft sealing arrangement as set forth in claim 5, characterized in that the end of the inner gland tube (1) remote from the flexible sealing membrane (4) extends radially inwardly to form a collar (101), the inner diameter dimension of the collar (101) being intermediate between the inner and outer diameter dimensions of the sealing ring (5), the collar (101) being adapted to block the sealing ring (5) from moving away from the flexible sealing membrane (4).

8. The shaft-to-shaft sealing device of a nested biaxial, according to claim 7, characterized in that the retainer ring (101) is provided with an annular rib (102), and the end face of the seal ring (5) is provided with an annular groove (501) matching with the annular rib (102).