CN114856821A

CN114856821A - Bearing pedestal and gas turbine

Info

Publication number: CN114856821A
Application number: CN202210661638.4A
Authority: CN
Inventors: 张发生; 郑健生; 杨庆材; 邵艳红; 蓝吉兵; 张伟; 隋永枫
Original assignee: Hangzhou Steam Turbine Co Ltd
Current assignee: Hangzhou Steam Turbine Co Ltd
Priority date: 2022-06-13
Filing date: 2022-06-13
Publication date: 2022-08-05

Abstract

The application relates to the technical field of gas turbines, in particular to a bearing seat and a gas turbine. This bearing frame includes in two pedestal that the median plane is closed relatively, at least one the pedestal is in the median plane department has seted up the seal groove, the inlet port has been seted up to the pedestal, the inlet end of inlet port link up the surface of pedestal, the end of giving vent to anger of inlet port link up the seal groove to make sealing gas pass through the inlet port carry extremely in the seal groove. The gas turbine includes the bearing housing. According to the bearing seat and the gas turbine, the sealing groove is formed in the middle parting surface of the bearing seat, the sealing gas is continuously supplied into the sealing groove, the pressure of the sealing gas is higher than the internal pressure of the bearing seat, and therefore lubricating oil, oil smoke and oil mist in the bearing seat can be prevented from leaking through the middle parting surface through the high-pressure flow of the sealing gas in the middle parting surface gap.

Description

Bearing seat and gas turbine

Technical Field

The application relates to the technical field of gas turbines, in particular to a bearing seat and a gas turbine.

Background

The gas turbine has a main shaft rotating at a high speed, and in order to ensure smooth rotation of the main shaft, the main shaft is supported by bearings installed in bearing housings.

Generally need lubricate the bearing and dispel the heat through lubricating oil, in order to ensure that the bearing can carry out the dismouting for the bearing frame, the bearing frame sets up to being formed by the amalgamation of two parts pedestal usually, because the machining precision of every part pedestal and the assembly precision restriction between the two parts pedestal, lead to the mid-plane department between the two parts pedestal to have the clearance that can't eliminate, so there is the risk of lubricating oil leakage in the mid-plane department of bearing frame usually, in addition, there is sound clearance bearing frame and main shaft spare, so also there is the risk of lubricating oil leakage in sound clearance department, lubricating oil leakage can cause a series of unnecessary troubles.

At present, in order to prevent the lubricating oil from leaking through the dynamic and static gaps, a shaft seal structure is usually provided in the dynamic and static gaps, for example, a labyrinth seal structure is provided and sealing gas is introduced into the labyrinth seal structure to realize dynamic and static sealing.

Sealing of the gap at the mid-split is usually achieved by bolt pretension in combination with a sealing compound.

In order to realize good sealing of the split surfaces, the requirement on the processing precision of the split surfaces is high, and the cost is increased; and the bolt pretightening force is required to be high, a plurality of bolts need to be arranged on the bisection plane, but due to space limitation, the bisection plane bolts cannot be encrypted infinitely, and meanwhile, the pretightening force of the bolts cannot be increased infinitely, so that reliable sealing cannot be realized by improving the pretightening force of the bolts.

In addition, the sealant is easy to deteriorate after long-term operation in a high-temperature environment, so that the risk of lubricating oil leakage is caused, and long-term reliable sealing cannot be realized. In addition, the use of the sealant also causes inconvenience in the disassembly and assembly of the bearing seat.

Disclosure of Invention

The purpose of the present application is to provide a bearing seat and a gas turbine, so as to solve the technical problem that the prior art cannot reliably seal the split gap of the bearing seat of the gas turbine for a long time by an effective means so as to prevent the leakage of lubricating oil to a certain extent.

The application provides a bearing seat, which comprises two seat bodies, wherein the two seat bodies are oppositely combined in a middle split plane;

at least one the pedestal is in well minute face department has seted up the seal groove, the inlet port has been seted up to the pedestal, the inlet end of inlet port link up the surface of pedestal, the end of giving vent to anger of inlet port link up the seal groove to make sealed gas pass through inlet port carries extremely in the seal groove.

In the above technical solution, further, the seat body includes a flange and a main body portion;

the main body part is provided with an accommodating groove for accommodating a bearing and a shaft penetrating hole for penetrating a main shaft, an opening of the accommodating groove is positioned at the middle section, the shaft penetrating hole is arranged at the end part of the main body part along the axial direction of the accommodating groove, and the shaft penetrating hole is communicated with the accommodating groove;

the flange corresponds the bisection face set up in the edge of main part to make two pedestal pass through flange looks fastening connection, the seal groove with continuous mode set up in the flange and around in the outside of holding tank.

In any one of the above technical solutions, further, the axis of the accommodating groove is located in the middle dividing plane, and the two ends of the main body portion along the axial direction of the accommodating groove are both provided with the through-hole;

the main part is followed the radial both ends of holding tank all are provided with the seal groove.

In any one of the above technical solutions, further, the sealing groove includes a first sealing groove section, a second sealing groove section, and a third sealing groove section that are sequentially communicated in an shape.

In any one of the above technical solutions, further, the first sealing groove section is arranged at an interval with the shaft penetrating hole along one end of the accommodating groove, which is close to the shaft penetrating hole, in the radial direction;

the third sealing groove section is arranged at an interval with the shaft penetrating hole along one end of the accommodating groove, which is close to the shaft penetrating hole in the radial direction;

and/or the first sealing groove section extends along the radial direction of the accommodating groove, and the third sealing groove section extends along the radial direction of the accommodating groove.

In any one of the above technical solutions, further, an axis of the accommodating groove is perpendicular to the bisector plane, an opening of the accommodating groove is formed at one end of the main body portion along an axial direction of the accommodating groove, and the through-hole is formed at the other end of the main body portion;

the flange is the annular and corresponds the opening cover of holding tank is located the outer lane of main part, the seal groove is the annular and sets up in the flange.

In any one of the above technical solutions, further, the seal groove still includes the air feed section, the air feed section set up in the flange, the air feed section with the seal groove link up and be the angle setting, the air inlet through-hole set up in the flange and in the air feed section communicates.

In any one of the above technical solutions, further, the bearing seat further includes an air supply pipeline, the air supply pipeline is disposed outside the seat body, an air inlet section of the air supply pipeline is used for communicating with a sealed air supply source, and an air outlet end of the air supply pipeline is communicated with an air inlet end of the air inlet through hole.

In any of the above technical solutions, further, a groove depth or a groove width of the sealing groove is 3-7 mm.

The application also provides a gas turbine, including main shaft and above-mentioned arbitrary technical scheme the bearing frame, the length direction's of main shaft both ends all are provided with the bearing frame.

Compared with the prior art, the beneficial effect of this application is:

the application provides a bearing frame includes in two pedestals that the median plane is closed mutually, and at least one pedestal has seted up the seal groove in median plane department, and the inlet port hole has been seted up to the pedestal, and the inlet port of inlet port hole link up the surface of pedestal, and the end of giving vent to anger of inlet port hole link up the seal groove to make sealed gas carry to in the seal groove through the inlet port hole. Therefore, the sealing groove is formed in the middle parting surface of the bearing seat, the sealing gas is continuously supplied into the sealing groove, the pressure of the sealing gas is higher than the internal pressure of the bearing seat, and the lubricating oil, the oil smoke and the oil mist in the bearing seat can be prevented from leaking through the middle parting surface through the high-pressure flow of the sealing gas in the middle parting surface gap.

The bearing seat is thus:

firstly, the reliable sealing of the split surface of the bearing seat is realized, and zero leakage is ensured;

secondly, the sealing is realized without combining bolt pretightening force with sealing glue, so that the inconvenience in disassembly and assembly caused by the use of the sealing glue can be avoided, and the dependence on the bolt pretightening force can be reduced;

thirdly, after long-term operation, the sealing effect can not be influenced by problems such as deformation of the split surfaces or insufficient pretightening force of the bolts, and long-term stable and reliable sealing can be ensured.

The gas turbine provided by the application comprises the bearing seat, so that all the beneficial effects of the bearing seat can be realized. In addition, the bearing seats are arranged at the two ends of the main shaft in the length direction, so that the bearing seats arranged on the turbine side of the main shaft cannot cause fire due to leakage of lubricating oil due to high working temperature of the turbine side, and the bearing seats arranged on the compressor side of the main shaft cannot cause air intake pollution of the compressor due to leakage of the lubricating oil, so that safe operation of the unit can be ensured.

Drawings

In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a seat body of a bearing seat provided in an embodiment of the present application;

FIG. 2 is a partial schematic structural view of the bearing housing of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is an enlarged view of a portion of FIG. 2 at B;

FIG. 5 is an enlarged view of a portion of FIG. 2 at C;

fig. 6 is a first structural schematic diagram of a bearing seat provided in an embodiment of the present application;

fig. 7 is a second structural schematic diagram of a bearing seat according to an embodiment of the present application.

Reference numerals:

1-a bearing seat; 10-a seat body; 100-a main body portion; 101-a flange; 102-bolt hole; 103-shaft through hole; 104-a bearing cavity; 1040-holding grooves; 105-an air inlet through hole; 12-a seal groove; 120-a gas supply section; 121-a first sealed channel section; 122-a second sealed trough section; 123-a third seal groove section; 13-a gas supply line; 130-a gas supply main; 131-a first gas supply branch; 132-second gas supply manifold.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

Example one

Referring to fig. 1 to 7, an embodiment of the present application provides a bearing housing 1 for supporting a main shaft of a gas turbine.

The bearing seat 1 comprises two seat bodies 10 and an air supply pipeline 13 which are oppositely arranged in a median plane.

Hereinafter, the above-described components of the bearing housing 1 will be described in detail.

In an alternative of this embodiment, at least one of the seat bodies 10 has a sealing groove 12 formed at a middle dividing plane, in other words, as shown in fig. 6 and 7, the upper seat body 10 has a sealing groove 12, or the lower seat body 10 has a sealing groove 12, and further, both the seat bodies 10 may have a sealing groove 12.

The base body 10 is provided with an air inlet hole 105, specifically, the base body 10 provided with the sealing groove 12 is provided with an air inlet hole 105, an air inlet end of the air inlet hole 105 penetrates through the outer surface of the base body 10, and an air outlet end of the air inlet hole 105 penetrates through the sealing groove 12, so that the sealing gas is conveyed into the sealing groove 12 through the air inlet hole 105, and the leakage of lubricating oil, oil smoke, oil mist and the like in the base body 10 can be prevented through the flowing of the sealing gas, wherein the sealing gas is, for example, sealing air.

Optionally, each sealing groove 12 corresponds to at least one air inlet through hole 105, and it can be understood that when the sealing grooves 12 are formed in both the two base bodies 10 and the sealing grooves 12 of the two base bodies are matched, the two sealing grooves 12 can share one air inlet through hole 105.

In this embodiment, the housing 10 includes a flange 101 and a main body 100.

The main part 100 is provided with an accommodating groove 1040 for accommodating the bearing and a shaft penetrating hole 103 for penetrating the main shaft, the opening of the accommodating groove 1040 is located at the middle split surface, the shaft penetrating hole 103 is axially arranged at the end part of the main part 100 along the accommodating groove 1040, and the shaft penetrating hole 103 is communicated with the accommodating groove 1040, so that after the bearing is placed into the accommodating groove 1040, the main shaft extends into the bearing in the accommodating groove 1040 through the shaft penetrating hole 103, and the assembly of the bearing and the main shaft is realized.

The flange 101 is disposed at the edge of the main body 100 corresponding to the middle plane, so that the two housing bodies 10 are tightly connected by the flange 101, and the sealing groove 12 is disposed at the flange 101 in a continuous manner and surrounds the outer portion of the receiving groove 1040, thereby ensuring that the sealing range of the sealing air surrounds the bearing cavity and ensuring that the bearing cavity is sealed in all directions.

Optionally, the flange 101 is provided with a bolt hole 102 for a fastening bolt to pass through the bolt hole 102 to fasten and involute the two seat bodies 10, and after the two seat bodies 10 are involuted, the receiving grooves 1040 of the two seat bodies 10 are pieced together to form a bearing cavity, so as to realize reliable support of the bearing.

Specifically, the two housing bodies 10 may be connected in a manner of a horizontal flange 101 connection or a vertical flange 101 connection.

As an embodiment in which the two seat bodies 10 are connected by the horizontal flange 101, the axis of the receiving groove 1040 is located in the middle dividing plane, and both ends of the main body 100 along the axial direction of the receiving groove 1040 are provided with the through-hole 103; the main body portion 100 is provided with a seal groove 12 at both ends in the radial direction of the receiving groove 1040.

In this embodiment, in order to improve the sealing tightness of the sealing groove 12 around the bearing cavity 104, the sealing groove 12 includes a first sealing groove segment 121, a second sealing groove segment 122, and a third sealing groove segment 123 that are sequentially communicated in an shape.

If the sealing gas leaks into the bearing cavity 104, the pressure in the bearing cavity 104 is unbalanced, which affects the cooling and lubrication of the bearing, and also causes unnecessary consumption of the sealing gas, which wastes the sealing gas.

Therefore, the first sealing groove segment 121 is spaced from the shaft penetrating hole 103 along one end of the receiving groove 1040 close to the shaft penetrating hole 103 in the radial direction; the third seal groove section 123 is close to the one end of wearing shaft hole 103 along the radial of holding tank 1040 and is set up with wearing shaft hole 103 interval, can avoid the sealed gaseous through wearing shaft hole 103 of first seal groove section 121 and third seal groove section 123 to leak to bearing chamber 104, ensures that the bearing box unbalancing can not take place and the extravagant condition of sealed gas takes place.

Alternatively, to simplify the structure, the first seal groove segment 121 extends in a radial direction of the receiving groove 1040, and the third seal groove segment 123 extends in a radial direction of the receiving groove 1040.

In another embodiment where the two seat bodies 10 are connected by the vertical flange 101, the axis of the receiving groove 1040 is perpendicular to the median plane, one end of the main body 100 along the axial direction of the receiving groove 1040 forms an opening of the receiving groove 1040, and the other end is provided with the shaft passing hole 103.

The flange 101 is annular and is fitted to the outer ring of the main body 100 corresponding to the opening of the receiving groove 1040, and the seal groove 12 is annular and is opened in the flange 101.

In the alternative of this embodiment, the sealing groove 12 further includes a gas supply section 120, the gas supply section 120 is provided on the flange 101, the gas supply section 120 is communicated with the sealing groove 12 and is disposed at an angle, and the gas inlet through hole 105 is provided on the flange 101 and is communicated with the gas supply section 120.

In an alternative of this embodiment, in order to continuously supply the sealing gas to the sealing groove 12, the bearing housing 1 further includes an air supply pipeline 13, the air supply pipeline 13 is disposed outside the housing body 10, and an air inlet section of the air supply pipeline 13 is used for communicating with a sealing gas supply source, for example, a compressor air extractor or instrument air for a unit, an air outlet end of the air supply pipeline 13 is communicated with an air inlet end of the air inlet through hole 105, so that the sealing gas provided by the sealing gas attack source is continuously conveyed into the sealing groove 12 through the air supply pipeline 13 and the air inlet through hole 105.

It is worth emphasizing that to ensure an effective seal, the pressure of the sealing gas needs to be greater than the gas pressure within the bearing cavity 104.

Alternatively, in the case that the two seat bodies 10 are connected by the horizontal flange 101, the seat body 10 has two sealing grooves 12, the air supply pipeline 13 includes a main air supply pipe 130, a first branch air supply pipe 131 and a second branch air supply pipe 132, an air inlet end of the main air supply pipe 130 is communicated with a sealing air supply source, air inlet ends of the first branch air supply pipe 131 and the second branch air supply pipe 132 are communicated with an air outlet end of the main air supply pipe 130, for example, the three are communicated by a three-way joint, and an air outlet end of the first branch air supply pipe 131 and an air outlet end of the second branch air supply pipe 132 are respectively communicated with the air inlet through holes 105 of the two sealing grooves 12.

In this embodiment, the depth or width of the sealing groove 12 is 3-7mm, such as 3mm, 4mm, 5mm, 6mm, or 7mm, to ensure that the flow of the sealing gas is sufficient to achieve a reliable sealing effect, and the waste of the sealing gas is avoided.

Example two

The second embodiment provides a gas turbine, the second embodiment comprises the bearing seat of the first embodiment, the technical features of the bearing seat disclosed in the first embodiment are also applicable to the second embodiment, and the technical features of the bearing seat disclosed in the first embodiment are not repeated.

The gas turbine provided by the embodiment comprises a main shaft and bearing seats 1, wherein the bearing seats 1 are arranged at two ends of the main shaft in the length direction. Specifically, the end of the main shaft near the turbine side is provided with a bearing seat 1, and the end of the main shaft near the compressor side is also provided with a bearing seat 1, so that the main shaft can stably rotate under the support of the bearing seats 1 at both ends.

After the bearing seat 1 is sealed by the sealing gas introduced into the sealing groove 12, the leakage of lubricating oil, oil smoke and oil mist can be effectively prevented. The temperature of the turbine side is high, so that fire can be effectively avoided, and leaked lubricating oil and the like can be effectively prevented from polluting air inlet of the air compressor.

The gas turbine in the present embodiment has the advantages of the bearing seat in the first embodiment, and the advantages of the bearing seat disclosed in the first embodiment will not be described again.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention. Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Claims

1. A bearing seat is characterized by comprising two seat bodies which are oppositely arranged in a middle split plane;

2. The bearing housing of claim 1, wherein the housing body comprises a flange and a body portion;

3. The bearing seat according to claim 2, wherein the axis of the accommodating groove is located in the midsplit surface, and the shaft penetrating hole is formed at each of two ends of the main body part in the axial direction of the accommodating groove;

4. The bearing housing of claim 3, wherein the seal groove comprises a first seal groove segment, a second seal groove segment and a third seal groove segment which are sequentially communicated in an shape.

5. The bearing seat according to claim 4, wherein the first sealing groove section is arranged at a distance from the shaft penetrating hole along one end of the accommodating groove close to the shaft penetrating hole in the radial direction;

the third sealing groove section is arranged at intervals with the shaft penetrating hole along one end, close to the shaft penetrating hole, of the accommodating groove in the radial direction;

6. The bearing housing according to claim 2, wherein the axis of the accommodating groove is perpendicular to the bisector plane, one end of the main body portion in the axial direction of the accommodating groove forms an opening of the accommodating groove, and the other end is provided with the shaft penetration hole;

7. The bearing seat according to any one of claims 3 to 6, wherein the sealing groove further comprises a gas supply section, the gas supply section is provided on the flange, the gas supply section is communicated with the sealing groove and is disposed at an angle, and the gas inlet through hole is provided on the flange and is communicated with the gas supply section.

8. The bearing seat according to claim 1, further comprising an air supply pipeline, wherein the air supply pipeline is disposed outside the seat body, an air inlet section of the air supply pipeline is used for communicating with a sealing gas supply source, and an air outlet end of the air supply pipeline is communicated with an air inlet end of the air inlet through hole.

9. The bearing housing of claim 1, wherein the groove depth or groove width of the seal groove is 3-7 mm.

10. A gas turbine engine comprising a main shaft and a bearing housing according to any one of claims 1 to 9;

the bearing seats are arranged at two ends of the main shaft in the length direction.