阅读说明：本技术 一种适用于燃气轮机传动箱体试验的衬套及其安装方法 (Bushing suitable for gas turbine transmission box body test and mounting method thereof ) 是由 贾新旺 唐祖定 张再峰 商显耀 于 2021-08-13 设计创作，主要内容包括：本发明涉及一种适用于燃气轮机传动箱体试验的衬套及其安装方法,包括传动箱体,传动箱体内设有驱动轴,传动箱体口部设有限量供油组件,所述限量供油组件包括：顶部筒管、与顶部筒管伸入传动箱体一端相连的顶部过渡段、连接在顶部过渡段背离顶部筒管一侧的轴端盖,轴端盖同轴套设在驱动轴上；顶部过渡段内同轴设置聚油衬套,所述聚油衬套包括壳体、设置在壳体上的溢流孔,所述顶部筒管的壁内设有进油通道,进油通道的出油一端连通至壳体口部,所述轴端盖靠近驱动轴的圆周位置设有凸阶,所述壳体底部与溢流孔底部之间的竖直高度,大于轴端盖的凸阶高度。聚油衬套能够同时对传动箱体内部供油,还能够为轴承提供所需的滑油。(The invention relates to a bush suitable for a gas turbine transmission case test and an installation method thereof, wherein the bush comprises a transmission case, a driving shaft is arranged in the transmission case, a limited oil supply component is arranged at the opening part of the transmission case, and the limited oil supply component comprises: the top barrel, a top transition section connected with one end of the top barrel extending into the transmission box body and a shaft end cover connected to one side of the top transition section, which is far away from the top barrel, are coaxially sleeved on the driving shaft; the top transition section is internally and coaxially provided with an oil gathering bush, the oil gathering bush comprises a shell and an overflow hole arranged on the shell, an oil inlet channel is arranged in the wall of the top barrel pipe, the oil outlet end of the oil inlet channel is communicated to the opening of the shell, a convex step is arranged at the circumferential position, close to the driving shaft, of the shaft end cover, and the vertical height between the bottom of the shell and the bottom of the overflow hole is greater than the height of the convex step of the shaft end cover. The oil gathering bushing can supply oil to the interior of the transmission case body simultaneously and can provide required lubricating oil for the bearing.)

1. The utility model provides a bush suitable for gas turbine transmission case is experimental, the supporting transmission case (1) that has, be equipped with drive shaft (2) in transmission case (1), its characterized in that: the mouth of the transmission case body (1) is provided with a limited oil supply component,

the limited fuel supply unit includes: the top bobbin (4), a top transition section (5) connected with one end, extending into the transmission box body (1), of the top bobbin (4), and a shaft end cover (6) connected to one side, deviating from the top bobbin (4), of the top transition section (5), wherein the shaft end cover (6) is coaxially sleeved on the driving shaft (2); an oil gathering bush (7) is coaxially arranged in the top transition section (5),

the oil gathering bushing (7) comprises a shell (701) and an overflow hole (702) arranged on the shell (701),

an oil inlet channel (8) is arranged in the wall of the top bobbin (4), the oil outlet end of the oil inlet channel (8) is communicated with the opening of the shell (701),

the shaft end cover (6) is provided with a convex step at the circumferential position close to the driving shaft (2), and the vertical height between the bottom of the shell (701) and the bottom of the overflow hole (702) is greater than the height of the convex step of the shaft end cover (6).

2. The bushing adapted for testing a gas turbine engine gearbox casing of claim 1, wherein: casing (701) are the pipe form, and casing (701) inner wall is close to oil feed passageway (8) department chamfer setting.

3. The bushing adapted for testing a gas turbine engine gearbox housing of claim 2, wherein: the chamfer angle of the inner wall of the shell (701) is flush with the outer diameter of the oil inlet channel (8).

4. The bushing adapted for testing a gas turbine engine gearbox casing of claim 1, wherein: the end face of the top of the shell (701) is flush with an oil outlet of the oil inlet channel (8), and the end face of the bottom of the shell (701) is in contact with the shaft end cover (6).

5. The bushing adapted for testing a gas turbine engine gearbox casing of claim 1, wherein: the shell (701) is in clearance fit with the top transition section (5).

6. A method of making a liner suitable for testing a gas turbine engine gearbox casing according to claim 1, comprising the steps of:

firstly, manufacturing a bushing: according to the inner diameter of the top transition section (5), selecting a metal pipe with a corresponding outer diameter, and cutting the length of the metal pipe, namely the distance between the surface of the oil outlet of the oil inlet channel (8) and the shaft end cover (6), so as to obtain a bush blank;

cutting overflow holes (702) on the liner blank;

the top angle of the overflow hole (702) is rounded;

chamfering is arranged on the inner wall of the liner blank, and the chamfering position and the position of the overflow hole (702) are respectively positioned at two ends of the liner blank;

finely adjusting the outer diameter of the bushing blank to ensure that the tolerance fit between the finished bushing and the inner wall of the top transition section (5) is H8/f7, and the machined surface roughness is 6.3 grade;

secondly, installing a bush: and (3) mounting the finished bushing product into the top transition section (5) by hand pushing, and matching with the inner wall of the top transition section (5) with a medium clearance.

7. The method of manufacturing a liner suitable for testing a gas turbine engine gearbox casing of claim 6, wherein: the inner diameter range of the top transition section (5) is 125-130mm, and the outer diameter range of the top transition section (5) is 130-135 mm; the wall thickness ranges from 7 mm to 8 mm.

8. The method of manufacturing a liner suitable for testing a gas turbine engine gearbox casing of claim 6, wherein: the position of the linear cutting overflow hole (702) is 16mm away from the bottom of the steel pipe blank, 4 long holes are uniformly cut along the circumference of the cylinder body to serve as the overflow hole (702), and R6 round corners are arranged around the long holes.

9. The method of manufacturing a liner suitable for testing a gas turbine engine gearbox casing of claim 6, wherein: the tolerance is f7 grade, the upper deviation is-0.043, and the lower deviation is-0.083; the maximum clearance of the tolerance fit with the top transition section (5) of the transmission case body (1) is 0.146, and the minimum clearance is 0.043.

Technical Field

The invention relates to the technical field of transmission case tests, in particular to a bushing suitable for a gas turbine transmission case test and an installation method thereof.

Background

The lower transmission case of the gas turbine is one of important accessory devices of the gas turbine, is formed by meshing and assembling a plurality of gear shafts, and has the following functions: in the starting process of the gas turbine, the torque of a starting motor is transmitted to a compressor rotor, so that the compressor is driven to work; when the gas turbine normally operates, the torque of the gas compressor is respectively transmitted to the lubricating oil component and the fuel pump which are connected with the gas compressor, so that lubricating oil and fuel oil are provided for the gas turbine. Meanwhile, the lubricating oil of the compressor bearing is collected and pumped and circulated by the lubricating oil assembly. Therefore, the lower transmission box plays an important role in the normal operation of the gas turbine.

When the lower transmission case runs on the gas turbine, lubricating oil in the oil cavity of the compressor is divided into two parts after passing through a transition section at the top of the lower transmission case, and one part returns to the oil tank from a half-moon hole of a bearing end cover of the central transmission shaft through a bearing to play a role in lubricating the bearing; the other part enters the lower transmission case shell from the round hole of the end cover and returns to the oil tank.

At present, the research work of testing the lower transmission case of the gas turbine independently in China is very little, and if the same lubricating oil flow rate when the lower transmission case runs on the gas turbine is provided during the test, the two defects are as follows: firstly, when the lower transmission case operates independently, the amount of lubricating oil needed by the top bearing of the central transmission shaft is far less than the amount of lubricating oil provided; secondly, large-flow supply is realized, a pump with higher parameters needs to be configured, and the construction cost of the test bed is higher.

When independently testing the lower transmission case, if the required lubricating oil amount of top bearing lubrication is directly provided, because the special structure of end cover, there is the convex step, lubricating oil can directly get into the lower transmission case casing by the round hole of end cover, and few part probably gets into bearing lubrication, and then influences the test result.

Disclosure of Invention

The applicant aims at the defects in the prior art and provides a bushing which is reasonable in structure and suitable for the test of a transmission case of a gas turbine and an installation method thereof.

The technical scheme adopted by the invention is as follows:

a bush suitable for a gas turbine transmission case test is matched with a transmission case, a driving shaft is arranged in the transmission case, a limited oil supply component is arranged at the opening part of the transmission case,

the limited fuel supply unit includes: the top barrel, a top transition section connected with one end of the top barrel extending into the transmission box body and a shaft end cover connected to one side of the top transition section, which is far away from the top barrel, are coaxially sleeved on the driving shaft; an oil gathering bush is coaxially arranged in the transition section at the top part,

the oil gathering bushing comprises a shell and an overflow hole arranged on the shell,

an oil inlet channel is arranged in the wall of the top barrel pipe, the oil outlet end of the oil inlet channel is communicated with the opening part of the shell,

the shaft end cover is provided with a convex step at the circumferential position close to the driving shaft, and the vertical height between the bottom of the shell and the bottom of the overflow hole is greater than the height of the convex step of the shaft end cover.

As a further improvement of the above technical solution:

the casing is the pipe form, and shells inner wall is close to oil feed passageway department chamfer setting.

The chamfer angle of the inner wall of the shell is flush with the outer diameter of the oil inlet channel.

The end face of the top of the shell is flush with the oil outlet of the oil inlet channel, and the end face of the bottom of the shell is in contact with the shaft end cover.

The shell is in clearance fit with the top transition section.

A method of making a liner suitable for testing a gas turbine transmission case, comprising the steps of:

firstly, manufacturing a bushing: according to the inner diameter of the top transition section, selecting a metal pipe with a corresponding outer diameter, and cutting the length of the metal pipe, namely the distance between the oil outlet surface of the oil inlet channel and the shaft end cover to obtain a bushing blank;

cutting overflow holes on the liner blank;

rounding off the top angle of the overflow hole;

chamfering is arranged on the inner wall of the lining blank, and the chamfering position and the overflow hole position are respectively positioned at two ends of the lining blank;

finely adjusting the outer diameter of the bushing blank to ensure that the tolerance fit between the finished bushing and the inner wall of the top transition section is H8/f7, and the machined surface roughness is 6.3 grade;

secondly, installing a bush: and mounting the finished bushing product into the top transition section by hand pushing, and matching the finished bushing product with the inner wall of the top transition section in a medium clearance manner.

As a further improvement of the above technical solution:

the inner diameter range of the top transition section is 130mm and the outer diameter range of the top transition section is 130mm and 135 mm; the wall thickness ranges from 7 mm to 8 mm.

The position of the linear cutting overflow hole is 16mm away from the bottom of the steel pipe blank, 4 long holes are uniformly cut along the circumference of the cylinder body to serve as overflow holes, and R6 round corners are formed around the long holes.

The tolerance is f7 grade, the upper deviation is-0.043, and the lower deviation is-0.083; the maximum clearance of the tolerance fit with the top transition section of the transmission case is 0.146, and the minimum clearance is 0.043.

The invention has the following beneficial effects:

the invention has compact and reasonable structure, convenient operation and accurate oil control, and is particularly suitable for the single-piece test of the transmission case at the lower part of the gas turbine; the oil gathering bush is additionally arranged on a path through which lubricating oil flows, the oil gathering bush can supply oil to the interior of the transmission box body at the same time and can also provide the required lubricating oil for the bearing, and because the oil quantity required by the bearing and the transmission box body is different, the amount of the lubricating oil overflowing through the overflow hole of the oil gathering bush is less than that of the lubricating oil flowing into the transmission box body through the shaft end cover.

In the invention, a plurality of overflow holes are arranged, and oil is uniformly discharged from the circumference of the shell; the chamfer of the inner wall of the top of the shell is arranged, so that the smoothness of an oil path of the oil inlet channel can be ensured.

The oil gathering bushing and the top transition section are in clearance fit, and the oil gathering bushing is just high enough to be clamped between the shaft end cover and the top barrel pipe, so that the oil flowing and lubricating effects can be guaranteed, and the oil gathering bushing is not easy to axially and radially move.

Drawings

Fig. 1 is a cross-sectional view of the present invention.

Fig. 2 is a schematic structural view of the oil-gathering bushing of the present invention.

Fig. 3 is a schematic view of the installation structure of the oil gathering bushing of the present invention.

Wherein: 1. a transmission case body; 2. a drive shaft; 3. a bearing; 4. a top bobbin; 5. a top transition section; 6. a shaft end cover; 7. an oil collecting bushing; 8. an oil inlet channel;

701. a housing; 702. an overflow aperture.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1-3, the bushing suitable for the test of the transmission case of the gas turbine of the embodiment is matched with the transmission case 1, a driving shaft 2 is arranged in the transmission case 1, an opening of the transmission case 1 is provided with an oil supply limiting component,

the oil supply limiting component comprises: the top bobbin 4, a top transition section 5 connected with one end, extending into the transmission box body 1, of the top bobbin 4 and a shaft end cover 6 connected to one side, deviating from the top bobbin 4, of the top transition section 5, wherein the shaft end cover 6 is coaxially sleeved on the driving shaft 2; an oil gathering bush 7 is coaxially arranged in the top transition section 5,

the oil collecting bushing 7 comprises a shell 701, an overflow hole 702 arranged on the shell 701,

an oil inlet channel 8 is arranged in the wall of the top bobbin 4, the oil outlet end of the oil inlet channel 8 is communicated with the opening part of the shell 701,

the circumference position of the shaft end cover 6 close to the driving shaft 2 is provided with a convex step, and the vertical height between the bottom of the shell 701 and the bottom of the overflow hole 702 is greater than the height of the convex step of the shaft end cover 6.

The casing 701 is the pipe form, and casing 701 inner wall is close to 8 chamfer settings of oil feed passageway.

The chamfer angle of the inner wall of the shell 701 is flush with the outer diameter of the oil inlet channel 8.

The top end face of the shell 701 is flush with the oil outlet of the oil inlet channel 8, and the bottom end face of the shell 701 is in contact with the shaft end cover 6.

The shell 701 is in clearance fit with the top transition section 5.

The method for manufacturing the bushing suitable for the gas turbine gearbox body test comprises the following steps:

firstly, manufacturing a bushing: according to the inner diameter of the top transition section 5, selecting a metal pipe with a corresponding outer diameter, and cutting the length of the metal pipe, namely the distance between the surface of the oil outlet of the oil inlet channel 8 and the shaft end cover 6 to obtain a bush blank;

cutting overflow holes 702 on the liner blank;

the top corners of the overflow holes 702 are rounded, and the purpose of chamfering is to reduce the oil blockage phenomenon;

chamfering is arranged on the inner wall of the liner blank, and the chamfering position and the position of the overflow hole 702 are respectively positioned at two ends of the liner blank;

finely adjusting the outer diameter of the bushing blank to ensure that the tolerance fit between the finished bushing and the inner wall of the top transition section 5 is H8/f7, and the machined surface roughness is 6.3 grade;

secondly, installing a bush: and (4) mounting the finished bushing product into the top transition section 5 by hand pushing, and matching with the inner wall of the top transition section 5 with a medium clearance.

The inner diameter range of the top transition section 5 is 130mm and the outer diameter range of the top transition section 5 is 130mm and 135 mm; the wall thickness ranges from 7 mm to 8 mm.

The position of the linear cutting overflow hole 702 is 16mm away from the bottom of the steel pipe blank, 4 long holes are uniformly cut along the circumference of the cylinder to serve as the overflow hole 702, and round corners of R6 are rounded around the long holes.

The tolerance is f7 grade, the upper deviation is-0.043, and the lower deviation is-0.083; the maximum clearance of the tolerance fit with the top transition section 5 of the transmission case 1 is 0.146, and the minimum clearance is 0.043.

The specific structure and the working principle of the embodiment are as follows:

as shown in fig. 1-3, the transmission case 1 of the present invention has a driving shaft 2 therein, the driving shaft 2 extends to the mouth of the transmission case 1, and a shaft cover 6 is coaxially sleeved on the driving shaft 2. A top transition section 5 is coaxially sleeved at the excircle circumference of the shaft end cover 6, referring to fig. 3, one end of the top transition section 5 close to the shaft end cover 6 is conical, and the small end of the cone is folded back to one side of the shaft end cover 6; at the small end of the top transition section 5 a cylindrical extension is formed, which is connected to the inner wall of the top bobbin 4. An oil gathering bushing 7 is arranged in one end, close to the top barrel pipe 4, of the top transition section 5, a chamfer position of the inner wall of the oil gathering bushing 7 is connected with an oil outlet end of the oil inlet channel 8, and oil output by the oil inlet channel 8 just falls into the oil gathering bushing 7 completely.

Referring to the arrows in fig. 3, the flow direction of the lubricant is shown. Lubricating oil firstly enters the oil gathering bush 7 from the oil inlet channel 8, then gathers at the bottom of the oil gathering bush 7, and if the height of the oil is higher than that of the bottom of the overflow hole 702, the oil flows from the bottom of the overflow hole 702 to enter a hole of an end cover of the bearing 3 and enters the transmission case body 1; and the lubricating oil level in the oil collecting bushing 7 is higher than the height of the convex step of the shaft end cover 6, and then the lubricating oil enters the position of the bearing 3 for oil lubrication.

Referring to fig. 3, the protruding step of the shaft cover 6 is lower than the lowest position of the overflow hole 702, the gap between the protruding step and the driving shaft 2 is small, and a groove for temporarily storing lubricating oil is provided between the protruding step and the housing 701, so that the lubricating oil cannot fall to the bearing 3 completely, thereby ensuring accurate supply of a small amount of lubricating oil required by the bearing 3.

The process of manufacturing the oil collecting bushing 7 is as follows: the inner diameter of the lower transmission case body 1 is 128mm, a seamless steel pipe with the outer diameter of 133mm and the wall thickness of 7.5 specified in GB/T17395 is selected, and a blank of the seamless steel pipe with the length of 61mm is cut according to the end face distance between the transmission case body 1 and the shaft end cover 6; uniformly cutting 4 60X 20 long holes along the periphery at a position 16mm away from the bottom of the steel pipe blank by using linear cutting to serve as round corners of R6 on the periphery of the long hole of the overflow hole 702; manufacturing a chamfer angle on the part of the pipe body, which is 15mm away from the top; is used for opening the oil supply port; processing the outer diameter of the pipe body to 128mm, wherein the tolerance is f7 grade; the tolerance fit with the top transition 5 of the transmission case 1 is H8/f7, and the machined surface roughness is 6.3 grades.

When the test shows that whether the installation is qualified or not, firstly, an oil gathering bushing 7 is placed on the top transition section 5, and an oil inlet of an oil inlet channel 8 is connected with an external oil pipe; starting an oil pump, observing that lubricating oil overflows the convex steps of the shaft end cover 6, enabling part of the lubricating oil to flow to the bearing 3 and enabling part of the lubricating oil to enter the box body from the overflow hole 702; if the oil gathering bush 7 is not added, the oil pump is started, and the lubricating oil directly enters the box body and does not flow to the bearing 3 for lubrication; the amount of oil required for lubricating the bearings 3 cannot be controlled.

The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.