CN212536217U

CN212536217U - Gas-liquid two-phase flow sealing device for low-speed shaft

Info

Publication number: CN212536217U
Application number: CN202021055381.0U
Authority: CN
Inventors: 林耀朋; 孙健; 姜国盛; 张振天; 徐家炜
Original assignee: Suzhou Dingyu Energy Efficient Equipment Co Ltd
Current assignee: Suzhou Dingyu Energy Efficient Equipment Co Ltd
Priority date: 2020-06-10
Filing date: 2020-06-10
Publication date: 2021-02-12
Anticipated expiration: 2030-06-10

Abstract

The utility model discloses an air-liquid two-phase flow sealing device for a low-speed shaft, which comprises a shaft sleeve fixed on the shaft, a first sealing ring and a second sealing ring which are mutually matched and sealed; an oil seal seat is arranged on the outer side of one end of the shaft sleeve, and a circulating medium sleeve connected with the oil seal seat is sleeved outside the shaft sleeve; a sealing seat is arranged on the outer side of the other end of the shaft sleeve; a first sealing ring and a second sealing ring are arranged between the circulating medium sleeve and the sealing seat; a gap is reserved between the circulating medium sleeve and the shaft sleeve, and a sealing medium injection hole and a sealing medium discharge hole which are communicated with the gap are formed in the circulating medium sleeve. The utility model provides a gas-liquid two-phase flow sealing device for low-speed axle can carry out the auxiliary shaft and seal, promotes the security performance that industrial production adds man-hour.

Description

Gas-liquid two-phase flow sealing device for low-speed shaft

Technical Field

The utility model relates to a sealing device field among the mechanical equipment, concretely relates to gas-liquid two-phase flow sealing device for low-speed axle.

Background

Because the rotating shaft penetrates through the inside and the outside of the equipment, a circumferential gap exists between the shaft and the equipment, a medium in the equipment leaks outwards through the circumferential gap, and if the pressure in the equipment is lower than the atmospheric pressure of air, the air leaks into the equipment, so that the mechanical sealing is carried out through the shaft sealing device.

The traditional chemical centrifugal pump shaft seal is a structure when the shaft seal is a packing seal, and the packing seal of the structure can only pump liquid in a sealing way. When the pumped liquid contains volatile gas, the volatile gas in the medium conveying process can be leaked to the atmosphere through the sealing cavity, and if the volatile gas is harmful gas, the environment is polluted and the health of field operators is harmed after the volatile gas is leaked.

In view of stricter emissions regulations, there is a continuing need for shaft seal rings with lower friction for sealing crankshafts. At the same time, it is necessary to ensure sufficient stability of the shaft sealing ring against underpressure and overpressure occurring during operation of the engine, for example in modern gasoline engines, in which considerable underpressure may occur in the crankcase. In the past, friction optimized radial shaft seal rings were used to seal the crankshaft, with pressure stabilization achieved by proper geometry of the seal lip. However, the friction reduction that can be achieved with radial shaft seal rings is limited.

DE102011114349a1 discloses a face seal for sealing a crankshaft. Face seals typically have very low friction, but are made up of a relatively large number of individual components, take up a large amount of installation space, and are relatively expensive. The axial shaft seal ring according to EP 2749796 a1 also comprises a dust lip which is sealingly located on the bearing ring over the axial length, which dust lip, although providing sufficient dust protection, again leads to increased friction. Furthermore, the sealing element has only a low stability with respect to underpressure, since when underpressure is present on the engine side, the sealing lip is moved away from the bearing ring due to weakening in the vicinity of its connection with the reinforcing part, and the sealing function of the sealing lip is then completely lost.

The prior art discloses the patent names: shaft seal with shaft seal ring, patent No.: CN 201910822878.6; a shaft seal for sealing a shaft against a housing of a motor vehicle is disclosed, including a shaft seal ring having a seal lip for sealing the shaft against the housing, a labyrinth seal being disposed upstream of the shaft seal ring on an oil side of the shaft seal ring.

In the technical scheme disclosed in the prior patent, although the shaft sealing is realized through the structure of the sealing lip, the sealing medium cannot be conveniently introduced, and the functions of diluting and cleaning harmful substances in the sealing cavity cannot be realized.

Disclosure of Invention

The utility model overcomes prior art's is not enough, provides a gas-liquid two-phase flow sealing device for low-speed axle, can carry out the auxiliary shaft and seal, promotes the security performance that industrial production adds man-hour.

In order to achieve the purpose, the utility model adopts the technical proposal that; the gas-liquid two-phase flow sealing device for the low-speed shaft comprises a shaft sleeve fixed on the shaft, and a first sealing ring and a second sealing ring which are mutually matched and sealed; an oil seal seat is arranged on the outer side of one end of the shaft sleeve, and a circulating medium sleeve connected with the oil seal seat is sleeved outside the shaft sleeve; a sealing seat is arranged on the outer side of the other end of the shaft sleeve; the first sealing ring and the second sealing ring are arranged between the circulating medium sleeve and the sealing seat; a gap is reserved between the circulating medium sleeve and the shaft sleeve, and a sealing medium injection hole and a sealing medium discharge hole which are communicated with the gap are formed in the circulating medium sleeve; and a plugging piece which can be opened and closed relative to the gap is arranged in the sealing medium injection hole.

In a preferred embodiment of the present invention, the sealing seat is provided with a ring groove for installing the second sealing ring, and an elastic compensation member two is disposed between the ring groove and the second sealing ring.

In a preferred embodiment of the present invention, the oil seal seat is fixedly installed and connected with the circulating medium sleeve; and an elastic compensation part I is arranged between the sealing ring I and the oil seal seat.

In a preferred embodiment of the present invention, a cavity is formed between the shaft sleeve and the oil seal seat and between the circulating medium sleeve and the first and second sealing rings.

In a preferred embodiment of the present invention, a sealing member is disposed in the sealing medium discharge hole and can be opened and closed relative to the gap.

The utility model discloses a preferred embodiment, the shutoff piece is including setting up the support in the sealing medium filling hole, wear to be equipped with the axostylus axostyle on the support, the axostylus axostyle is close to the one end in clearance is provided with and supports the shutoff lamella that leans on the sealing medium filling hole, the axostylus axostyle is kept away from the one end in clearance is provided with the dog, the dog with be provided with the elasticity locating part between the support.

In a preferred embodiment of the present invention, the blocking member includes a support disposed in the sealing medium discharge hole, a shaft rod is disposed on the support, one end of the shaft rod away from the gap is provided with a blocking flap abutting against the sealing medium discharge hole, the shaft rod is close to one end of the gap is provided with a stopper, and an elastic limiting member is disposed between the stopper and the support.

In a preferred embodiment of the present invention, an inward concave ring groove is provided on one end of the first sealing ring close to the second sealing ring, and an outward convex ring platform is provided on one end of the second sealing ring close to the first sealing ring; the ring platform can be embedded into the ring groove.

According to the gas-liquid two-phase flow sealing device for the low-speed shaft disclosed by the embodiment, the beneficial effects are achieved:

a gas-liquid two-phase flow sealing device for a low-speed shaft can assist in shaft sealing and improve the safety performance in industrial production and processing.

1. And a closed cavity is formed by the shaft sleeve outer sleeve, the oil seal seat, the circulating medium sleeve and the gap between the first sealing ring and the second sealing ring. Through the sealing medium filling hole injection sealing medium who sets up on the circulation medium cover, can also derive the harmful substance of leaking in the cavity through the sealing medium discharge hole, perhaps derive the harmful substance in the cavity after the sealing medium dilutes.

2. And the first sealing ring and the second sealing ring are hermetically matched by the combination of the first sealing ring and the second sealing ring under the respective actions of the second elastic compensating part and the first elastic compensating part. The harmful substance leaks into the cavity.

3. The plugging piece which can realize opening and closing actions relative to the cavity and is arranged in the sealing medium injection hole is utilized to conduct one-way flow guide. And secondary protection is realized. The structure of the sealing medium exhaust hole is used for realizing the directional exhaust of harmful substances or diluted harmful substances.

Drawings

The present invention will be further explained with reference to the drawings and examples;

fig. 1 is a schematic structural diagram according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram according to a second embodiment of the present invention;

fig. 3 is an enlarged schematic view of part a according to an embodiment of the present invention;

fig. 4 is an enlarged schematic view of the portion B according to the embodiment of the present invention;

fig. 5 is a schematic structural diagram according to a third embodiment of the present invention;

fig. 6 is an enlarged schematic view of a part of a structure of a first sealing ring and a second sealing ring abutting against each other according to a third embodiment of the present invention;

in the figure, 1-shaft, 2-shaft sleeve, 31-transmission ring, 32-limiting block, 33-oil seal seat, 331-framework oil seal, 34-sealing end cover, 35-sealing element, 4-sealing element, 41-bracket, 42-shaft rod, 43-elastic limiting element, 44-sealing diaphragm, 51-sealing ring I, 52-sealing ring II, 54-elastic compensating element II, 55-elastic compensating element I, 551-abutting ring I, 552-elastic element, 553-abutting ring II, 56-cavity, 9-circulating medium sleeve, 91-sealing medium injection hole and 92-sealing medium discharge hole.

Detailed Description

The invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic drawings and illustrate, by way of illustration only, the basic structure of the invention, and which therefore show only the constituents relevant to the invention.

Example one

As shown in figures 1 and 3, the gas-liquid two-phase flow sealing device for the low-speed shaft comprises a shaft sleeve 2 fixed on the shaft, a first sealing ring 51 and a second sealing ring 52 which are matched and sealed with each other, wherein a pair of end faces, perpendicular to a rotation axis, of the first sealing ring 51 and the second sealing ring 52 are kept in fit and relatively slide under the action of fluid pressure and elastic force of a second elastic compensating piece 54 and a first elastic compensating piece 55 to prevent fluid leakage. The first sealing ring 51 is a static ring, and the second sealing ring 52 is a dynamic ring. The one end outside of axle sleeve 2 is provided with oil blanket seat 33, and the outside of oil blanket seat 33 still is provided with stopper 32, and the outside of stopper 32 is provided with driving ring 31, and driving ring 31 passes through the fixed setting of fastener on axle sleeve 2. The shaft sleeve 2 is also sleeved with a circulating medium sleeve 9, one side of the circulating medium sleeve 9 is fixed with the oil seal seat 33, a gap is reserved between the circulating medium sleeve 9 and the shaft sleeve 2, and the circulating medium sleeve 9 is provided with a sealing medium injection hole 91 and a sealing medium discharge hole 92 which are communicated with the gap. An annular sealing seat is arranged on the outer side of the other end of the shaft sleeve 2; a first sealing ring 51 and a second sealing ring 52 are arranged between the circulating medium sleeve 9 and the sealing seat. The shaft sleeve 2 forms a closed cavity 56 with the oil seal seat 33 and the gaps between the circulating medium sleeve 9 and the first and

second sealing rings

51 and 52.

Specifically, a first sealing ring 51 is arranged on the circulating medium sleeve 9, a first elastic compensation part 55 is arranged between the first sealing ring 51 and the oil seal seat 33, and the first elastic compensation part 55 is positioned in a gap between the shaft sleeve 2 and the circulating medium sleeve 9. The first elastic compensation part 55 comprises a first abutting ring 551 which abuts against the oil seal seat 33 in a gap and a second abutting ring 553 which abuts against the first sealing ring 51 in the gap, wherein an elastic part 552 is arranged between the first abutting ring 551 and the second abutting ring 553, and the first abutting ring 551 and the second abutting ring 553 are separated by an interval of the elastic part 552 to elastically compensate the first sealing ring 51.

Specifically, the sealing seat is provided with an annular groove for mounting the second sealing ring 52, an elastic compensation part two 54 is arranged between the annular groove and the second sealing ring 52, and the annular groove and the second sealing ring 52 are separated at intervals by the elastic compensation part two 54 to perform elastic compensation on the second sealing ring 52. And the first sealing ring 51 and the second sealing ring 52 are tightly abutted under the action of the first elastic compensating part 55 and the second elastic compensating part 54.

Specifically, the sealing medium injection hole 91 is provided with a closing member 4 openable and closable with respect to the cavity 56. The plugging member 4 that sets up in the sealing medium filling hole 91 is provided with on the support 41 including setting up the support 41 in the sealing medium filling hole 91 and wearing to be equipped with axostylus axostyle 42, and the one end that axostylus axostyle 42 is close to the clearance is provided with the shutoff lamella 44 that leans on sealing medium filling hole 91, and the one end that the clearance was kept away from to axostylus axostyle 42 is provided with the dog, is provided with elasticity locating part 43. More specifically, the holder 41 is structured only to support the penetration shaft 42, and the holder 41 does not restrict the injection and circulation of the sealing medium in the sealing medium injection hole 91. The blocking flap 44 is an arc-shaped blocking flap 44 with elasticity, and the concave surface of the arc-shaped blocking flap 44 faces the cavity 56. The stop of the shaft lever 42 and the convex surface of the sealing flap 44 are pushed by the injected sealing medium or the air flow pressure, the sealing flap 44 is forced to move towards the cavity 56, and the stop has a certain pushing force, so that the sealing flap 44 is forced to move towards the cavity 56. When the plugging flap 44 receives a thrust in the direction or loses the forward thrust, it is restored by the elastic member 552 to plug the sealing medium injection hole 91, thereby preventing a reverse flow. The sealing medium or the diluted harmful substance or the harmful substance which is to be removed from the cavity 56 can then be discharged directly into the corresponding collecting device via the sealing medium outlet opening 92.

Example two

In the first embodiment, as shown in fig. 2 to 4, the sealing medium discharge hole 92 is provided with a closing member 4 which can be opened and closed with respect to a gap. The blocking piece 4 comprises a support 41 arranged in the sealing medium discharge hole 92, a shaft rod 42 is arranged on the support 41 in a penetrating manner, one end, far away from the gap, of the shaft rod 42 is provided with a blocking diaphragm 44 abutting against the sealing medium discharge hole 92, one end, close to the gap, of the shaft rod 42 is provided with a stop block, and an elastic limiting piece 43 is arranged between the stop block and the support 41.

More specifically, the occluding flap 44 is an arc-shaped occluding flap 44 having elasticity. The inner concave surface of the cambered sealing diaphragm 44 in the sealing medium outlet hole 92 faces the outside of the sealing medium outlet hole 92, the outer convex surface of the cambered sealing diaphragm 44 faces the cavity 56, a ring of annular table is arranged in the sealing medium outlet hole 92 between the outer convex surface of the cambered sealing diaphragm 44 and the cavity 56, and the sealing diaphragm 44 normally seals the annular table in the sealing medium outlet hole 92. When the sealing medium or the diluted harmful substance or the harmful substance in the cavity 56 needs to be discharged, the sealing medium or the diluted harmful substance can be directly led out to the corresponding collecting device through the arranged sealing medium discharge hole 92, and when the sealing medium or the harmful substance in the cavity 56 does not need to be discharged, a valve for opening and closing arranged on a channel between the sealing medium discharge hole 92 and the collecting device can be directly closed.

EXAMPLE III

On the basis of the second embodiment, as shown in fig. 5, on the basis of the second embodiment, in order to improve the fit between the abutting ends of the first sealing ring 51 and the second sealing ring 52, an inward concave ring groove is formed at one end of the first sealing ring 51 close to the second sealing ring 52, an outward convex ring platform is formed at one end of the second sealing ring 52 close to the first sealing ring 51, and when the first sealing ring 51 abuts against the second sealing ring 52, the ring platform can be embedded into the ring groove, and the size of the ring platform is smaller than that of the ring groove, that is, the side ring surface of the ring platform is not in contact with the inner annular side wall of the ring. As shown in fig. 6, the first sealing ring 51 and the second sealing ring 52 are butted in a zigzag manner, so that a water vapor inlet path is prolonged, and the sealing performance is improved.

The working principle is as follows:

as shown in fig. 1 to 6, first, the first sealing ring 51 and the second sealing ring 52 are sealed by the elastic compensation member 55 and the second elastic compensation member 54, which are matched with each other to compensate the elastic force, so as to effectively prevent the gas-liquid mixture generated by the harmful substances from leaking or overflowing into the cavity 56 during production and operation.

When the vapor-liquid mixture of harmful substances permeates into the cavity 56 formed between the shaft sleeve 2 and the oil seal seat 33 and between the circulating medium sleeve 9 and the first and second sealing rings 51 and 52, the sealing medium is injected through the sealing medium injection hole 91 to dilute the vapor-liquid mixture of the harmful substances and is discharged through the sealing medium discharge hole 92. Sealing medium can be injected into the cavity 56 through the sealing medium injection hole 91, so that the sealing effect is improved. The circulation cleaning cavity 56 can also be realized by the sealing medium inlet hole 91 and the sealing medium outlet hole 92 cooperating with each other.

And a pair of end faces of the first sealing ring 51 and the second sealing ring 52 perpendicular to the rotation axis are kept in fit and relatively slide under the action of the fluid pressure and the elastic force of the second elastic compensating part 54 and the first elastic compensating part 55 to prevent fluid leakage.

In light of the foregoing, it is to be understood that various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The gas-liquid two-phase flow sealing device for the low-speed shaft comprises a shaft sleeve fixed on the shaft, and a first sealing ring and a second sealing ring which are mutually matched and sealed; the method is characterized in that: an oil seal seat is arranged on the outer side of one end of the shaft sleeve, and a circulating medium sleeve connected with the oil seal seat is sleeved outside the shaft sleeve; a sealing seat is arranged on the outer side of the other end of the shaft sleeve; the first sealing ring and the second sealing ring are arranged between the circulating medium sleeve and the sealing seat; a gap is reserved between the circulating medium sleeve and the shaft sleeve, and a sealing medium injection hole and a sealing medium discharge hole which are communicated with the gap are formed in the circulating medium sleeve; and a plugging piece which can be opened and closed relative to the gap is arranged in the sealing medium injection hole.

2. The gas-liquid two-phase flow sealing device for the low-speed shaft according to claim 1, wherein; and an annular groove for mounting a second sealing ring is arranged on the sealing seat, and an elastic compensating part II is arranged between the annular groove and the second sealing ring.

3. The gas-liquid two-phase flow sealing device for the low-speed shaft according to claim 2, wherein; the oil seal seat is fixedly installed and connected with the circulating medium sleeve; and an elastic compensation part I is arranged between the sealing ring I and the oil seal seat.

4. The gas-liquid two-phase flow sealing device for the low-speed shaft according to claim 3, characterized in that; and a cavity is formed between the shaft sleeve and the oil seal seat as well as between the circulating medium sleeve and the first sealing ring and between the circulating medium sleeve and the second sealing ring.

5. The gas-liquid two-phase flow sealing device for the low-speed shaft according to claim 4, wherein; and a plugging piece which can be opened and closed relative to the gap is arranged in the sealing medium discharge hole.

6. The gas-liquid two-phase flow sealing device for the low-speed shaft according to claim 5, wherein; the plugging piece comprises a support arranged in a sealing medium injection hole, a shaft rod penetrates through the support, a plugging membrane flap abutting against the sealing medium injection hole is arranged at one end, close to the gap, of the shaft rod, a stop block is arranged at one end, far away from the gap, of the shaft rod, and an elastic limiting piece is arranged between the stop block and the support.

7. The gas-liquid two-phase flow sealing device for the low-speed shaft according to claim 6, wherein; the sealing part comprises a support arranged in the sealing medium discharge hole, a shaft lever is arranged on the support in a penetrating mode, a sealing diaphragm abutting against the sealing medium discharge hole is arranged at one end, away from the gap, of the shaft lever, a stop block is arranged at one end, close to the gap, of the shaft lever, and an elastic limiting part is arranged between the stop block and the support.

8. The gas-liquid two-phase flow sealing device for the low-speed shaft according to claim 7, wherein; one end of the first sealing ring, which is close to the second sealing ring, is provided with a concave ring groove, and one end of the second sealing ring, which is close to the first sealing ring, is provided with a convex ring platform; the ring platform can be embedded into the ring groove.