CN220955730U

CN220955730U - Turbine impeller non-contact sealing system applied to high-pressure environment and turbine

Info

Publication number: CN220955730U
Application number: CN202323206286.2U
Authority: CN
Inventors: 李传旭; 齐大伟; 李伟华; 李卓; 李波; 隆勇; 邓关华
Original assignee: Chongqing Chongneng Power Machinery Co ltd
Current assignee: Chongqing Chongneng Power Machinery Co ltd
Priority date: 2023-11-27
Filing date: 2023-11-27
Publication date: 2024-05-14
Anticipated expiration: 2033-11-27

Abstract

The utility model provides a non-contact sealing system of a turbine impeller applied to a high-pressure environment, which is used for sealing a turbine impeller shaft and comprises the following components: the sealing shell is provided with a shaft hole for installing a turbine impeller shaft; the sealing parts are arranged in the shaft hole at intervals, so that an exhaust position is formed between two adjacent sealing parts, an exhaust channel is formed in the exhaust position along the diameter direction of the shaft hole, and the exhaust channel penetrates through the sealing shell; and a plurality of conveying pipes connected to the sealing shell and corresponding to the plurality of exhaust channels. The high-pressure gas in the turbine is decompressed step by step through the plurality of exhaust positions and the corresponding exhaust passages, so that the gas with higher pressure and temperature can be sealed, the influence of the rotating speed can be avoided, the zero leakage of the gas is realized, and the reliability of the whole mechanical unit is improved particularly for toxic gas.

Description

Turbine impeller non-contact sealing system applied to high-pressure environment and turbine

Technical Field

The utility model relates to the technical field of impeller sealing, in particular to a turbine impeller non-contact sealing system and a turbine applied to a high-pressure environment.

Background

The turbine impeller is a disc-shaped member manufactured through precision machining, is usually installed in a turbine to convey, boost or decompress gas, realizes the mutual conversion of mechanical energy (containing electric energy) and gas internal energy, and in order to avoid the leakage of conveyed gas, needs to seal the turbine impeller shaft, and at present, conventional labyrinth seal, carbon ring seal or dry gas seal are mostly used, and at the present, under the requirements of high rotating speed and high temperature, when the turbine impeller adopts conventional labyrinth seal and carbon ring seal, the turbine impeller shaft and the sealing surface generate friction, so that the possibility of leakage in the whole seal is high, the reliability is reduced, and when the dry gas seal is adopted, the cost is higher, and the whole system is complex.

As another example, chinese patent CN212359869U discloses an impeller sealing device of a turboexpander, when the device is operated, the sealing plate can prevent the gas in the device from leaking through the impeller, so as to reduce the leakage amount, but the gas cannot achieve complete sealing, so that the sealing device is a primary sealing. The matching mode of the annular groove and the connecting ring provided by the sealing device is similar to the traditional carbocycle sealing, friction is easy to generate between the annular groove and the contact surface when the shaft body rotates at a high speed, and the possibility of leakage is high.

Disclosure of utility model

Aiming at the defects existing in the prior art, the utility model provides a non-contact sealing system of a turbine impeller, which is applied to a high-pressure environment, and solves the problems of high possibility of leakage in the whole sealing, low reliability, high cost and complex whole system when dry gas sealing is adopted when a turbine impeller shaft in the prior art adopts conventional labyrinth sealing and carbon ring sealing.

Embodiments of the present utility model provide a non-contact sealing system for a turbine wheel for use in a high pressure environment for sealing a turbine wheel shaft, comprising:

The sealing shell is provided with a shaft hole for installing a turbine impeller shaft;

The sealing parts are arranged in the shaft hole at intervals, so that an exhaust position is formed between two adjacent sealing parts, an exhaust channel is formed in the exhaust position along the diameter direction of the shaft hole, and the exhaust channel penetrates through the sealing shell;

and a plurality of conveying pipes connected to the sealing shell and corresponding to the plurality of exhaust channels.

Preferably, the sealing system further comprises an air charging pipe arranged on the sealing shell, and the air charging pipe corresponds to the air discharging channel at the end part of the sealing shell.

Preferably, the conveying pipe and the air charging pipe are both provided with valves.

Preferably, the sealing shell is recessed downwards along the axis of the exhaust channel to form a groove, and the end part of the conveying pipe and the end part of the gas charging pipe are respectively arranged in the grooves in the corresponding exhaust channels.

Preferably, the conveying pipe and the inflation pipe are both provided with connecting flanges.

Preferably, the connecting flange is provided with a plurality of connecting hole sites penetrating through the connecting flange.

Preferably, the sealing part comprises a plurality of sealing teeth which are arranged at intervals along the axis of the shaft hole, and a sealing channel is formed between two adjacent sealing teeth.

Preferably, the spacing between the seal teeth is equal to provide uniform seal channel dimensions.

The embodiment of the utility model also provides a turbine, which comprises a mounting shell and a non-contact sealing system of the turbine impeller applied to a high-pressure environment.

Preferably, the mounting shell is provided with a screw rod which is connected with the sealing shell.

Compared with the prior art, the utility model has the following beneficial effects:

Under the effect of the sealing shell and the sealing parts, when gas enters the shaft hole through the inner side surface of the sealing turbine impeller shaft, the leaked gas can be split through the plurality of exhaust channels, so that the gas with higher pressure enters the exhaust channels through the exhaust position closest to the turbine impeller, and finally, the gas is conveyed to the low-pressure inlet or outlet inside the turbine through the connected conveying pipe, the relatively lower gas pressure sequentially enters the exhaust channels of the subsequent plurality of exhaust positions and is conveyed to the recovery device through the connected conveying pipe, the high-pressure gas inside the turbine is decompressed step by step through the plurality of exhaust positions and the corresponding exhaust channels, the gas with higher pressure and temperature can be sealed, the influence of rotating speed is avoided, the zero leakage of the gas inside the turbine is realized, the problem of the leakage of the high-pressure gas is well solved, and particularly, the reliability of the whole mechanical unit can be improved for toxic gas.

Drawings

Fig. 1 is a schematic plan view of an embodiment of the present utility model.

Fig. 2 is a schematic diagram of the working principle of the embodiment of the present utility model.

Fig. 3 is an enlarged schematic view of the area a in fig. 1.

In the above figures: 1. a turbine wheel shaft; 2. a delivery tube; 21. a connecting flange; 211. connecting hole sites; 3. a sealed housing; 31. a first end; 32. a second end; 33. an exhaust location; 34. an exhaust passage; 35. a sealing part; 351. sealing teeth; 352. sealing the channel; 36. a groove; 37. a shaft hole; 4. a valve; 5. an inflation tube; 6. a mounting shell; 61. and (3) a screw.

Detailed Description

The technical scheme of the utility model is further described below with reference to the accompanying drawings and examples.

As shown in fig. 1 and 2, an embodiment of the present utility model proposes a non-contact sealing system for a turbine wheel applied to a high pressure environment for sealing a turbine wheel shaft 1, comprising:

a seal housing 3 provided with a shaft hole 37 for mounting the turbine impeller shaft 1;

The sealing parts 35 are arranged in the shaft hole 37 at intervals, so that an exhaust position 33 is formed between two adjacent sealing parts 35, an exhaust channel 34 is formed in the exhaust position 33 along the diameter direction of the shaft hole 37, and the exhaust channel 34 penetrates out of the sealing shell 3;

And a plurality of delivery pipes 2 connected to the hermetic shell 3 and corresponding to the plurality of exhaust passages 34.

In the embodiment of the utility model, the sealing shell 3 is taken as a mounting medium, the shaft hole 37 for mounting the turbine impeller shaft 1 is formed in the sealing shell 3, the diameter of the shaft hole 37 is a, the diameter of the turbine impeller shaft 1 is b, a is larger than b, a certain distance is formed between the surface of the turbine impeller shaft 1 and the inner side of the shaft hole 37, a space is provided for the arrangement of the sealing part 35, when the turbine impeller on the turbine impeller shaft 1 acts on gas, when the gas enters the shaft hole 37 through the inner side surface (see the first end part 31 in fig. 1) of the turbine impeller shaft 1, the gas which is oozed out is shunted through the plurality of exhaust passages 34 under the action of the plurality of sealing parts 35, so that the pressure of the gas can be gradually reduced in the seepage process, the gas pressure in the exhaust position 33 closest to the turbine impeller is relatively maximum, the gas with the largest pressure enters the exhaust channel 34 through the exhaust position 33 closest to the position of the turbine wheel, the exhaust channel 34 discharges the gas with the inside through the opposite conveying pipe 2, after the leaked gas is gradually depressurized by the sealing parts 35, the gas pressure entering the subsequent exhaust position 33 is gradually reduced and sequentially discharged through the corresponding exhaust position 33, the exhaust channel 34 and the conveying pipe 2, in the whole working process of the turbine wheel, the high-pressure gas in the turbine is depressurized step by step through the plurality of exhaust positions 33 and the corresponding exhaust channel 34, the gas with higher pressure and temperature can be sealed without being influenced by the rotating speed, the zero leakage of the gas in the turbine is realized, particularly, the reliability of the whole mechanical unit is effectively improved aiming at toxic gas, under the premise that the sealing parts 35 are arranged in the shaft holes 37, the sealing part 35 still has a certain gap with the turbine impeller shaft 1, under the condition that the gap exists between the sealing part 35 and the turbine impeller shaft 1, the gap, the exhaust position 33 and the exhaust channels 34 form a through gas passage, so that gas can sequentially enter into each exhaust channel 34, and interaction with the sealing shell 3 is not generated in the process of driving the turbine impeller shaft 1, namely, dynamic and static components are not in direct contact and cannot be influenced by high rotation speed and high temperature.

In order to further improve the overall tightness, the low-pressure gas is prevented from being finally discharged through the tail end (see the second end 32 in fig. 2) of the turbine impeller shaft 1, as shown in fig. 2, the sealing system further comprises an air charging pipe 5 arranged at the end of the sealing shell 3, the air charging pipe 5 corresponds to an air discharging channel 34 at the end of the sealing shell 3, three air discharging positions 33 shown in the figure are taken as examples (the actual use condition is not limited by quantity), the whole area of the sealing shell 3 is divided into a, b, c, d and o, wherein a is the first end 31, o is the second end 32, b, c and d are the air discharging channels 34 at different positions, the permeated air is transmitted to b through a, the pressure at each place is represented by P, namely Pa is approximately Pb, when the air at the pressure Pb is discharged to the corresponding air conveying channel 2 through b, part of the air is led to c, but the air at the pressure Pb is less than Pb, the air at the pressure Pc is discharged to the corresponding air conveying channel 2 through c, the whole area of the air conveying channel 2 in a is connected to the turbine inlet, a is a conveying channel 2, a is connected to the air conveying channel at the first end 31, c is connected to the air conveying channel at the second end 31, c is different in pressure is different from the pressure of Pc to the air conveying channel through the different positions, and Pc is effectively recovered, namely, the pressure Pc is effectively recovered through the pressure Pc is discharged to the whole air through d, namely the air is discharged to the air through the air conveying channel through d is completely through the air conveying channel, and d is effectively high through the pressure is more than d. And, conveyer pipe 2 and gas tube 5 all are equipped with valve 4, can adjust the pressure in each conveyer pipe 2 and the gas tube 5 through valve 4, ensure that Pa's pressure is kept a relatively high parameter as far as possible, and Pd is as low as possible, and is most ideal slightly positive pressure simultaneously, in conclusion, everywhere pressure relation is Pa apprxeq Pb, pb > Pc, pd > Po, pd is more than or equal to Po, and the flow direction of gas please refer to the arrow in figure 2.

Moreover, as shown in fig. 2, the seal portion 35 includes a plurality of seal teeth 351 arranged at intervals along the axis of the shaft hole 37, seal passages 352 are formed between two adjacent seal teeth 351, the spacing between the seal teeth 351 is equal to make the sizes of the seal passages 352 uniform, the seal portion 35 is formed by a plurality of seal teeth 351, the seal teeth 351 form the seal passages 352 with each other, and when gas passes through the gas passages formed by the gaps, the exhaust position 33 and the exhaust passage 34, the gas is subjected to preliminary decompression under the action of the plurality of seal passages 352, the speed of the gas in the shaft hole 37 is reduced, and the seal passages 352 are uniform in size to make the flow directions of the gas entering the seal passages 352 substantially uniform, so that the seal passages 352 have a remarkable effect on the speed reduction of the gas flow.

As shown in fig. 3, the seal case 3 is recessed downward along the axis of the exhaust passage 34 to form a groove 36, and the end of the delivery tube 2 and the end of the inflation tube 5 are respectively disposed in the groove 36 in the corresponding exhaust passage 34.

In the embodiment of the utility model, in order to facilitate the butt joint of the conveying pipe 2 and/or the gas charging pipe 5 and the exhaust channel 34, when the sealing shell 3 is processed, the exhaust channel 34 is taken as an axle center, a groove 36 with the diameter larger than the outlet of the exhaust channel 34 is formed, so that the end parts of the conveying pipe 2 and the gas charging pipe 5 can be directly clamped in the groove 36, the end parts of the gas charging pipe 5 are fixedly connected with the groove 36, and in order to facilitate the installation and the disassembly of each pipeline, the threaded connection can be adopted; welding can also be adopted, wherein the positioning of the end part of the air charging tube 5 before welding can be achieved through the arrangement of the groove 36, so that the passage of the air charging tube 5 is always corresponding to the exhaust passage 34, and the air charging tube 5 is not easy to move during welding, so that the welding quality is ensured. Secondly, as shown in fig. 1, the conveying pipe 2 and the gas charging pipe 5 are both provided with a connecting flange 21, under the action of the connecting flange 21, the conveying pipe 2 and the gas charging pipe 5 which are connected with each other can be respectively and fixedly connected with a turbine and a recovery device, as shown in fig. 1, the connecting flange 21 is provided with a plurality of connecting hole sites 211 penetrating through the connecting flange, and when the connecting flange is fixedly connected, the connecting flange is connected with external equipment, and the screw 61 can be used for fixedly connecting in a penetrating mode of each connecting hole site 211.

As shown in fig. 1, the embodiment of the present utility model further provides a turbine, including the installation shell 6, and further includes a non-contact sealing system for a turbine impeller applied to a high-pressure environment, where the specific structure of the non-contact sealing system refers to the above embodiment.

Specifically, as shown in fig. 1, the screw 61 is disposed on the installation shell 6, the screw 61 is connected to the seal shell 3, so as to facilitate maintenance of the seal shell 3 and each element inside, and the installation shell 6 and the seal shell 3 are mutually static components, so that the installation shell 6 and the seal shell 3 can be fixedly assembled in a manner of the screw 61, thereby ensuring stability after connection of the installation shell 6 and the seal shell 3, and facilitating subsequent disassembly and maintenance.

The implementation principle of the embodiment of the application is as follows:

When the turbine impeller shaft 1 drives the turbine impeller to work and part of high-pressure gas enters the shaft hole 37 through the inner side surface (the first end 31) of the turbine impeller shaft 1, the high-pressure gas is divided by a plurality of exhaust positions 33 and exhaust channels 34 and is discharged out of the exhaust channels 34 after being depressurized one by one and enters the turbine inner low-pressure inlet or outlet or recovery device, and the process gas is introduced into the corresponding exhaust channels 34 by opening and adjusting the valves 4 on the air tube 5, so that the gas permeated into the exhaust channels 34 is returned to the last exhaust channel 34 to be discharged, the normal sealing efficiency is ensured, and the valves 4 on the conveying pipes 2 are adjusted, so that the Pa pressure is ensured to maintain a higher parameter as much as possible, and Pd is lower as much as possible.

In summary, the application can gradually decompress the permeated gas through the non-contact type plurality of exhaust channels 34, so that the gas with different pressures enters different recovery pipelines, the gas with high pressure enters the low pressure inlet or outlet inside the turbine, the gas with relatively lower pressure can directly enter the recovery device, the problem of leakage of the high pressure gas can be well solved, especially for toxic gas, the reliability of the whole mechanical unit can be improved, and compared with the conventional non-contact labyrinth seal and carbon ring seal, the application can seal the gas with higher pressure and temperature, and the gas can not be influenced by the rotating speed, so that the gas in the turbine has zero leakage, and compared with the conventional dry gas seal, the application has simple structure and low price.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered by the scope of the claims of the present utility model.

Claims

1. A non-contact sealing system for a turbine wheel for use in a high pressure environment for sealing a turbine wheel shaft (1), comprising:

a seal housing (3) provided with a shaft hole (37) for mounting the turbine wheel shaft (1);

The sealing parts (35) are arranged in the shaft holes (37) at intervals, so that exhaust positions (33) are formed between two adjacent sealing parts (35), the exhaust positions (33) are provided with exhaust channels (34) along the diameter direction of the shaft holes (37), and the exhaust channels (34) penetrate through the sealing shell (3);

and a plurality of delivery pipes (2) connected to the sealing case (3) and corresponding to the plurality of exhaust passages (34).

2. The non-contact sealing system of a turbine wheel for high pressure applications according to claim 1, further comprising an air charging tube (5) provided to said seal housing (3), said air charging tube (5) corresponding to said air discharge channel (34) at the end of said seal housing (3).

3. A non-contact sealing system for a turbine wheel for high pressure applications according to claim 2, wherein the delivery tube (2) and the gas filling tube (5) are each provided with a valve (4).

4. A non-contact sealing system for a turbine wheel for high pressure applications according to claim 2 or 3, wherein said sealing shell (3) is recessed downwardly along the axis of said exhaust passage (34) to form a recess (36), and the ends of said delivery tube (2) and said gas-filled tube (5) are respectively disposed in said recess (36) in the corresponding exhaust passage (34).

5. A non-contact sealing system for a turbine wheel for high pressure applications according to claim 3, wherein said delivery tube (2) and said gas-filled tube (5) are each provided with a connection flange (21).

6. The non-contact sealing system for a turbine wheel in a high pressure environment according to claim 5, wherein said connecting flange (21) is provided with a plurality of connecting holes (211) extending therethrough.

7. The non-contact seal system for a turbine wheel for use in a high pressure environment as set forth in claim 1, wherein said seal (35) includes a plurality of seal teeth (351) spaced along the axis of said shaft bore (37), a seal channel (352) being formed between adjacent ones of said seal teeth (351).

8. The non-contact seal system for a turbine wheel for use in a high pressure environment as set forth in claim 7 wherein said seal teeth (351) are equally spaced to provide uniform sizing of each said seal passage (352).

9. A turbine comprising a mounting housing (6), characterized in that it further comprises a non-contact sealing system for a turbine wheel, according to any of claims 1-8, for application in a high pressure environment.

10. A turbine according to claim 9, characterized in that the mounting shell (6) is provided with a screw (61), said screw (61) being connected to the sealing shell (3).