CN115898960A

CN115898960A - Impeller shaft structure and centrifugal compressor

Info

Publication number: CN115898960A
Application number: CN202211329136.8A
Authority: CN
Inventors: 张鹏飞; 牛大勇; 杜崇洋; 刘亮; 李桐; 邵天一
Original assignee: SHENYANG BLOWER GROUP GEAR COMPRESSOR CO Ltd; Shenyang Blower Works Group Corp
Current assignee: SHENYANG BLOWER GROUP GEAR COMPRESSOR CO Ltd; Shenyang Blower Works Group Corp
Priority date: 2022-10-27
Filing date: 2022-10-27
Publication date: 2023-04-04

Abstract

The embodiment of the application discloses impeller shaft structure and centrifugal compressor, wherein impeller shaft structure includes: a rotating shaft; the bearing is sleeved on the rotating shaft; the bearing box is connected to the rotating shaft; the air seal is sleeved on the rotating shaft; the oil seal is sleeved on the rotating shaft and is positioned between the gas seal and the bearing; and the oil thrower disc is sleeved on the rotating shaft, and part of the oil thrower disc is positioned between the oil seal and the bearing. The oil thrower disc of the impeller shaft structure synchronously rotates along with the bearing, under the action of centrifugal force, oil attached to the oil thrower disc is thrown onto the wall surface of the oil seal and then flows back to the inside of the bearing box along the wall surface of the oil seal, so that the oil mist can be better prevented from leaking towards the direction of process gas, the sealing effect of the impeller shaft structure can be improved based on the oil thrower disc, the service life of the centrifugal compressor is prolonged, and the compression quality of the process gas is improved.

Description

Impeller shaft structure and centrifugal compressor

Technical Field

The embodiment of the application relates to the technical field of compressors, in particular to an impeller shaft structure and a centrifugal compressor.

Background

Centrifugal compressors, also known as turbine compressors, have a centrifugal force imparted to the gas by the high-speed rotating impeller therein and a diffusion effect imparted to the gas in a diffusion channel to increase the gas pressure, and are widely used in the fields of air separation, coal chemical industry and petrochemical industry.

The centrifugal compressor in the prior art has poor impeller shaft sealing effect, oil mist and other impurities generated by the operation of the impeller shaft are easy to mix into process gas, and the process gas is easy to leak, so that the safe operation of the centrifugal compressor is influenced.

Disclosure of Invention

The present invention has been made to solve at least one of the problems occurring in the prior art or the related art.

To this end, a first aspect of the invention provides an impeller shaft structure.

A second aspect of the present invention provides a centrifugal compressor.

In view of this, according to a first aspect of embodiments of the present application, there is provided an impeller shaft structure including: a rotating shaft; the bearing is sleeved on the rotating shaft; the bearing box is connected to the rotating shaft; the air seal is sleeved on the rotating shaft; the oil seal is sleeved on the rotating shaft and is positioned between the gas seal and the bearing; and the oil thrower disc is sleeved on the rotating shaft, and part of the oil thrower disc is positioned between the oil seal and the bearing.

In one possible embodiment, the oil slinger comprises:

the connecting part is in interference fit with the rotating shaft;

and the stopping part is connected to the connecting part and is positioned between the bearing and the oil seal.

In a possible embodiment, the oil seal is provided on the connecting portion, the oil seal is formed with an oil guide groove, and a free end of the stopper is disposed to be inclined toward the oil seal.

In one possible embodiment, the free end angle of the stop is 30 ° to 50 °.

In one possible embodiment, the oil guide groove further includes a recess formed above the oil seal.

In a possible embodiment, an orthographic projection of the stopper on the oil seal covers a portion of the recess.

In one possible embodiment, the impeller shaft structure further comprises:

and part of the bearing box is coated on the rotating shaft, and the sealing body is positioned between the bearing box and the oil seal and between the bearing box and the air seal.

In one possible embodiment, the impeller shaft structure further comprises:

and the inflation inlet is formed in the bearing box and communicated to a gap between the air seal and the oil seal.

In one possible embodiment, the impeller shaft structure further comprises:

and the impeller is connected to one end, deviating from the bearing box, of the rotating shaft.

According to a second aspect of embodiments herein there is provided a centrifugal compressor comprising: the impeller shaft structure according to any one of the above technical solutions.

Compared with the prior art, the invention at least comprises the following beneficial effects: the impeller shaft structure that this application embodiment provided has included the pivot, the bearing box, the atmoseal, oil blanket and disc, in the impeller shaft structure use, the pivot of impeller shaft structure is used for driving the impeller and rotates, the impeller is used for compressing process gas, and the bearing can make the rotation of pivot more steady, the bearing box can play the effect of support and lubricated bearing, simultaneously, the bearing box can undertake axial and the radial force that the impeller shaft structure produced at the during operation. The bearing is installed in the bearing box, can annotate lubricating oil in the bearing box, in the course of the work, uses the bearing to obtain the lubrication. Meanwhile, various forces applied to the rotating shaft during working can be transmitted to the bearing box and borne by the bearing box. The gas seal can be used for sealing a passage between the process gas and the bearing box, so that the process gas can be prevented from overflowing through a gap between the rotating shaft and the bearing box, and the leakage of the process gas is avoided; through the arrangement of the oil seal, the leakage of lubricating oil to the direction of process gas can be avoided, and when the impeller shaft structure is applied to a centrifugal compressor, the leakage of oil gas to the shell of the compressor can be avoided; the oil thrower dish is established on the pivot, and the oil thrower dish rotates along with the bearing synchronization, and on the effect of centrifugal force, oil attached to on the oil thrower dish was thrown away the wall of oil blanket, can flow back to within the bearing box along the wall of oil blanket again, can stop the oil mist to reveal to the process gas direction better, can improve the sealed effect of impeller shaft structure based on this, improve centrifugal compressor's life, improve process gas's compression quality simultaneously.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a schematic block diagram of an impeller shaft configuration of one embodiment provided herein;

FIG. 2 is an enlarged partial schematic view at the oil slinger of an impeller shaft configuration of one embodiment provided herein;

FIG. 3 is a functional block diagram of an oil slinger of an impeller shaft configuration of one embodiment provided herein;

fig. 4 is a schematic structural view of a stopper portion of a slinger of an impeller shaft structure of an embodiment provided in the present application.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 4 is:

110 rotating shaft, 120 bearing, 130 bearing box, 140 gas seal, 150 oil seal, 160 oil thrower, 170 oil guide groove, 180 sealing body, 190 charging port and 200 impeller;

161 connecting part, 162 stopper.

Detailed Description

In order to better understand the technical solutions of the embodiments of the present application, the following detailed descriptions are provided with accompanying drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the embodiments of the present application, but not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.

As shown in fig. 1 to 4, according to a first aspect of an embodiment of the present application, there is provided an impeller shaft structure including: a rotating shaft 110; the bearing 120 is sleeved on the rotating shaft 110; a bearing housing 130 connected to the rotation shaft 110; an air seal 140 sleeved on the rotating shaft 110; the oil seal 150 is sleeved on the rotating shaft 110 and is positioned between the gas seal 140 and the bearing 120; and the oil thrower 160 is sleeved on the rotating shaft 110, and part of the oil thrower 160 is positioned between the oil seal 150 and the bearing 120.

The impeller shaft structure provided by the embodiment of the application comprises a rotating shaft 110, a bearing 120, a bearing box 130, an air seal 140, an oil seal 150 and an oil thrower 160, wherein in the use process of the impeller shaft structure, the rotating shaft 110 of the impeller shaft structure is used for driving an impeller 200 to rotate, the impeller 200 is used for compressing process gas, the bearing 120 can enable the rotating shaft 110 to rotate more stably, the bearing box 130 can play a role in supporting and lubricating the bearing 120, and meanwhile, the bearing box 130 can bear axial and radial forces generated in the operation of the impeller shaft structure. The bearings 120 are mounted in a bearing housing 130, and the bearing housing 130 may be filled with a lubricating oil, and during operation, the bearings 120 are used for lubrication. Meanwhile, various forces applied to the rotating shaft 110 during operation are also transmitted to the bearing housing 130 and are carried by the bearing housing 130. The gas seal 140 is arranged to seal a passage between the process gas and the bearing housing 130, so as to prevent the process gas from overflowing through a gap between the rotating shaft 110 and the bearing housing 130 and prevent the process gas from leaking; through the arrangement of the oil seal 150, the leakage of lubricating oil to the direction of process gas can be avoided, and when the impeller shaft structure is applied to a centrifugal compressor, the leakage of oil gas to the shell of the compressor can be avoided; the disc 160 cover is established on pivot 110, and disc 160 rotates along with bearing 120 is synchronous, and under the effect of centrifugal force, oil attached to on disc 160 is thrown to the wall of oil blanket 150, can flow back to within the bearing box 130 along the wall of oil blanket 150 again, can stop the oil mist to reveal to the process gas direction better, can improve the sealed effect of impeller shaft structure based on this, improve centrifugal compressor's life, improve process gas's compression quality simultaneously.

As shown in fig. 1-4, in one possible embodiment, the oil slinger 160 comprises: the connecting part 161, the connecting part 161 and the rotating shaft 110 are in interference fit; and a stopper portion 162 connected to the connection portion 161 and located between the bearing 120 and the oil seal 150.

In the technical scheme, the structural composition of the oil slinger 160 is further provided, the oil slinger 160 comprises a connecting part 161 and a stopping part 162, the connecting part 161 is in interference fit with the rotating shaft 110, the oil slinger 160 can synchronously rotate with the rotating shaft 110, the stopping part 162 is arranged, the oil on the oil slinger 160 can be guided, under the condition that the rotating shaft 110 rotates, under the action of centrifugal force, the oil attached to the oil slinger 160 is thrown onto the wall surface of the oil seal 150, and then the oil can flow back to the bearing box 130 along the wall surface of the oil seal 150, so that the leakage of the oil mist to the direction of the process gas can be better avoided.

As shown in fig. 4, in some examples, the connection portion 161 and the stopper portion 162 may be an integral structure, which can improve the mechanical strength of the oil thrower 160.

As shown in fig. 1, in some examples, the oil seal 150 has a labyrinth structure, and this arrangement can further reduce the possibility of oil mist leakage.

As shown in fig. 1 to 3, in one possible embodiment, the oil seal 150 is sleeved on the connecting portion 161, the oil seal 150 is formed with an oil guiding groove 170, and the free end of the stopper portion 162 is disposed obliquely toward the oil seal 150.

In the technical scheme, the position relation and the connection relation between the oil seal 150 and the oil thrower 160 are further improved, and the oil seal 150 is sleeved on the connecting part 161, so that the connection between the oil seal 150 and the oil thrower 160 is tighter, and the oil mist can be prevented from leaking to a process gas through a gap between the oil seal 150 and the oil thrower 160.

In the technical scheme, an oil guide groove 170 is formed on the oil seal 150, the oil guide groove 170 and the stopper 162 are used in combination, when oil is attached to the oil thrower plate 160, under the action of centrifugal force and the guiding action of the stopper 162, the oil can be conveyed to the oil guide groove 170 through the stopper 162, and the oil can return to the bearing box 130 under the guiding action of the oil guide groove 170, so that the oil can be prevented from leaking to process gas, the sealing effect of an impeller shaft structure can be improved, the service life of the centrifugal compressor is prolonged, and the compression quality of the process gas is improved.

In this embodiment, the stopper 162 may be spaced apart from the oil seal 150 to facilitate formation of the oil guide groove 170, and the free end of the stopper 162 is disposed to be inclined toward the oil seal 150 to facilitate guiding the oil to the oil guide groove 170.

As shown in fig. 1 to 3, in one possible embodiment, the free end of the stopper 162 is inclined at an angle of 30 ° to 50 °.

In the technical scheme, the inclination angle of the stopping part 162 is further provided, the inclination angle of the stopping part 162 is 30-50 degrees, oil attached to the oil thrower 160 can be guided better, the oil attached to the oil thrower 160 can be guided to the oil guide groove 170 conveniently, and then the oil can return to the bearing box 130 under the guiding effect of the oil guide groove 170, so that the oil can be prevented from leaking to the process gas, the sealing effect of the impeller shaft structure can be improved, the service life of the centrifugal compressor is prolonged, and the compression quality of the process gas is improved.

As shown in fig. 4, the stopper 162 preferably has a free end inclined at 45 ° so as to guide the oil adhered to the oil thrower 160 to the oil guide groove 170, and then the oil can be returned to the bearing housing 130 by the guide of the oil guide groove 170.

As shown in fig. 1 to 3, in one possible embodiment, the oil guide groove 170 further includes a recess formed above the oil seal 150.

In this embodiment, a pattern of oil guide grooves 170 is further provided, and the oil guide grooves 170 may be recesses formed on the oil seal 150, so as to facilitate the machining of the oil guide grooves 170.

As shown in fig. 2, the dimension of the mark Φ e is larger than that of Φ f, and a recess with a radius R, that is, an oil guide groove, is formed based on this.

In some examples, the oil guide groove 170 may have an arc shape in section along the height direction of the oil seal 150, and one end of the arc shape may face the bearing housing 130, whereby the oil may be returned to the bearing housing 130 by the guide of the oil guide groove 170 when the oil is transferred into the oil guide groove 170.

As shown in fig. 1 to 3, in one possible embodiment, an orthographic projection of the stopper 162 on the oil seal 150 covers a portion recess.

In some examples, the orthographic projection of the stopper 162 on the oil seal 150 covers a portion of the recess, which can ensure that oil output along the stopper can be delivered into the oil guide groove 170, reduce the probability of oil delivery to the gap between the stopper 162 and the oil seal 150, and further reduce the probability of oil leakage to the process gas.

As shown in fig. 2, the size of the mark a is larger than that of the mark b, so that the orthogonal projection covering part of the stopper 162 on the oil seal 150 is recessed.

As shown in fig. 1 to 3, in one possible embodiment, the impeller shaft structure further includes: the sealing body 180, a part of the bearing housing 130 is coated on the rotating shaft 110, and the sealing body 180 is located between the bearing housing 130 and the oil seal 150 and between the bearing housing 130 and the oil seal 140.

In the technical scheme, the impeller shaft structure further comprises a sealing body 180, and the oil seal 150 and the gas seal 140 can be fixed through sealing strips, so that on one hand, the sealing effect of the oil seal 150 and the gas seal 140 can be enhanced, a gap can be formed between the oil seal 150 and the gas seal 140, and the risks of oil mist leakage to the impeller 200 and process gas leakage can be further reduced; on the other hand, the assembly of the impeller shaft structure is facilitated, for example, in the assembly process, the gas seal 140 and the oil seal 150 can be axially assembled and mounted on the sealing body 180 to form an assembly, and then the assembly is axially assembled in the bearing housing 130, so that the assembly efficiency can be improved.

In some examples, the gas seal 140 and the oil seal 150 are of a full circle structure and are mounted on the sealing body 180, so that the shapes of the oil seal 150 and the gas seal 140 can be adapted to the shape of the space between the bearing housing 130 and the rotating shaft 110, and the sealing effect can be improved.

As shown in fig. 1 to 3, in one possible embodiment, the impeller shaft structure further includes: and the air charging port 190 is formed in the bearing box 130 and communicated with the gap between the air seal 140 and the oil seal 150.

In this technical solution, the impeller shaft structure may further include an air charging port 190, and through the arrangement of the air charging port 190, air may be injected into the gap between the air seal 140 and the oil seal 150, so as to further improve the sealing effect of the impeller 200 shaft, so that a high pressure area is formed between the oil seal 150 and the air seal 140, and oil gas between the oil thrower 160 and the oil seal 150 may be prevented from leaking between the oil seal 150 and the air seal 140.

In one possible embodiment, the impeller shaft structure further comprises: the impeller 200 is connected to an end of the rotating shaft 110 away from the bearing housing 130.

In this technical solution, the impeller shaft structure may further include an impeller 200, the impeller 200 may be driven to rotate by the rotating shaft 110, and the process gas may be compressed by the rotation of the impeller 200.

According to a second aspect of embodiments of the present application, there is provided a centrifugal compressor comprising: the impeller shaft structure of any one of the above technical solutions.

The centrifugal compressor provided by the embodiment of the application comprises the impeller shaft structure of any one technical scheme, so that the centrifugal compressor has all the beneficial effects of the impeller shaft structure of the technical scheme.

The centrifugal compressor that this application embodiment provided, impeller shaft structure's sealed effect is more, can effectively prevent the oil gas in the bearing box 130 to leak centrifugal compressor's casing in, has improved centrifugal compressor's fail safe nature, has guaranteed compressed medium oil-free transport.

In some examples, the centrifugal compressor may further include a housing, and the impeller 200 of the impeller-shaft structure may be disposed within the housing, the impeller 200 serving to compress the process gas as the shaft 110 rotates.

In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are used broadly and should be construed to include, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present specification, the description of "one embodiment," "some embodiments," "specific embodiments," etc., means 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 do not necessarily 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.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An impeller shaft structure, comprising:

a rotating shaft;

the bearing is sleeved on the rotating shaft;

the bearing box is connected to the rotating shaft;

the air seal is sleeved on the rotating shaft;

the oil seal is sleeved on the rotating shaft and is positioned between the gas seal and the bearing;

and the oil thrower disc is sleeved on the rotating shaft, and part of the oil thrower disc is positioned between the oil seal and the bearing.

2. The impeller shaft structure according to claim 1, wherein said oil thrower comprises:

the connecting part is in interference fit with the rotating shaft;

3. The impeller shaft structure according to claim 2,

the oil seal is arranged on the connecting part in a sealing mode, an oil guide groove is formed in the oil seal, and the free end of the stopping part is arranged towards the oil seal in an inclined mode.

4. The impeller shaft structure according to claim 3,

the free end of the stop is inclined at an angle of 30 DEG to 50 deg.

5. The impeller shaft structure according to claim 3,

the oil guide groove further comprises a recess formed above the oil seal.

6. The impeller shaft structure according to claim 5,

the positive projection of the stopping part on the oil seal covers part of the recess.

7. Impeller shaft construction according to any one of claims 1 to 6, further comprising:

8. The impeller shaft structure of claim 7, further comprising:

and the inflation inlet is formed in the bearing box and communicated with a gap between the air seal and the oil seal.

9. Impeller shaft structure according to any one of claims 1 to 7, further comprising:

10. A centrifugal compressor, comprising:

an impeller shaft structure according to any one of claims 1 to 9.