Turbine rotor passive brake protection device and method

Abstract

The invention discloses a turbine rotor passive brake protection device and method.The turbine rotor passive brake protection device comprises a lining cover, a shaft hole is formed in one side of the lining cover, a plurality of protection pins are connected to one side of the lining cover, a punching and riveting end is arranged on one side of the lining cover, a sunk screw hole is formed in one side of the lining cover, and a lining cover hole is formed in one side of the lining cover; one end of the protection pin is connected with a protection pin step end, one end of the protection pin extends into the lining cover hole, one end of the protection pin step end penetrates through the lining cover hole and is embedded with the lining cover hole, a head hiding groove is formed in one side of the sunk screw hole, one end of the protection pin is provided with a chamfer, and the other end of the protection pin is arranged in a step shape. And one side of the lining cover is provided with a sunken end corresponding to the shaft hole. According to the invention, the effect of passive braking of the turbine rotor is effectively achieved, and the overall connection effect is ensured, so that the braking effect on the rotor is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of protection devices, and in particular to a turbine rotor passive braking protection device and method. Background Art

[0002] As an aviation auxiliary power unit, the air turbine starter is widely used in modern aircraft such as civil airliners, bombers, and trainers due to its simple structure, easy use, safety, reliability, and low cost. In addition, it is also often used as a starting device for industrial gas turbines and ship gas turbines. The air turbine starter generally includes an intake volute, a turbine rotor, a reduction gear, a meshing mechanism or a clutch, and an over-rotation protection mechanism, and sometimes an emergency disengagement mechanism is also provided. It is connected to the engine shaft through a reducer with a large reduction ratio. The air source of the high-speed turbine comes from the ground air supply or the onboard APU, and can also be drawn from another working engine.

[0003] The turbine rotor is a key component of the air turbine starter. When in use, its rotation speed can reach tens of thousands or even hundreds of thousands revolutions per minute. When the bearing on the turbine rotor fails, the turbine rotor will experience axial and radial vibrations and shakes. In order to avoid accidents caused by failures of the turbine rotor during rotation, the present invention proposes a turbine rotor passive braking protection device and method. Summary of the invention

[0004] The object of the present invention is to provide a turbine rotor passive braking protection device and method to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: comprising a lining cover, one side of which is provided with an axial hole, one side of which is connected with multiple protective pins, one side of which is provided with a punching rivet end, and one side of which is provided with a countersunk screw hole.

[0006] Preferably, a lining cover hole is opened on one side of the lining cover, one end of the protection pin is connected to a protection pin step end, one end of the protection pin extends into the lining cover hole, and one end of the protection pin step end passes through the lining cover hole and is embedded.

[0007] Preferably, a head-hiding groove is provided on one side of the countersunk screw hole.

[0008] Preferably, one end of the protection pin is chamfered, and the other end is stepped.

[0009] Preferably, a recessed end is provided on one side of the lining cover corresponding to the axial hole.

[0010] A method for using a turbine rotor passive brake protection comprises the following steps:

[0011] Step 1: Install the liner cover into the installation fixture, and install the protection pin into the tooling in turn. The inner angle direction of the step end of the protection pin should be facing the direction of the turbine rotor, and then use the matching punch to press it into the liner cover hole. This is an interference fit. The end face of the step end of the protection pin is higher than the end face of the liner cover. This length has a great influence on the braking effect of the turbine rotor and needs to be accurately calculated during design.

[0012] Step 2: After all the protection pins are installed, install the pressure plate on the installation fixture, and rivet the lining cover. After riveting, ensure that the protection pin is not loose, and the lining cover hole fits the step end of the protection pin. After riveting, remove the flange and burr of the rivet end. Finally, check that there should be no pressure damage or cracking on the surface of the parts. The lining cover assembly is completed.

[0013] Step 3: In the air turbine starter, the rotor protection liner is installed on the front end of the turbine casing, the shaft of the turbine rotor passes through the shaft hole in the middle of the liner and extends into the turbine casing, the wheel disc of the turbine rotor is in front of the liner, and the bearing is assembled on the shaft of the turbine rotor in the turbine casing;

[0014] Step 4: When installing the liner cover on the turbine casing, make sure that the countersunk screw hole is aligned with the mounting hole on the turbine casing. Insert the protection pin into the pin hole on the turbine casing assembly. There is a clearance fit here. Then pass the countersunk screw through the countersunk screw hole and tighten it. Check whether the liner cover is installed in place and whether there is any gap around it.

[0015] Step 5. When the air turbine starter is in use, if the bearing on the turbine rotor fails, the turbine rotor will experience axial and radial vibration and shaking. In this case, the turbine rotor hub will scratch the step end of the protective pin extending from one side of the liner to stop the rotor from rotating, thereby passively braking the turbine rotor.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the present invention, when the bearing on the turbine rotor fails, the turbine rotor will experience axial and radial vibration and shaking. In this case, the turbine rotor hub will scrape the step end surface of the protection pin on the rotor protection liner to stop the rotor from rotating, thus playing the role of passively braking the turbine rotor;

[0018] 2. The present invention also installs the lining cover into the installation fixture, and the protection pin is installed into the tooling in turn. The inner angle direction of the step end of the protection pin should be facing the direction of the turbine rotor, and then it is pressed into the lining cover hole with a matching punch. Here, it is an interference fit. The end face of the step end of the protection pin is higher than the length of the end face of the lining cover. This length has a great influence on the braking effect of the turbine rotor and needs to be accurately calculated during the design. After all the protection pins are installed, the pressure plate on the installation fixture is installed, and the lining cover is riveted. After riveting, it is ensured that the protection pin is not loose, and the lining cover hole is in contact with the step end of the protection pin. After riveting, the flange and burr of the riveted end are removed. Finally, it is checked that there should be no pressure damage, cracking and the like on the surface of the parts. The lining cover is assembled to ensure the overall connection effect, thereby ensuring the braking effect on the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a turbine rotor passive brake protection device of the present invention;

[0020] Figure 2 This is a schematic diagram of the front view structure of a turbine rotor passive brake protection device of the present invention;

[0021] Figure 3 This is a schematic cross-sectional structure diagram of a turbine rotor passive brake protection device according to the present invention, viewed from direction A;

[0022] Figure 4 This is a schematic diagram of the cross-sectional structure of a turbine rotor passive braking protection device according to the present invention, viewed in direction B.

[0023] In the figure: 1, lining cover; 2, shaft hole; 3, protection pin; 4, punching and riveting end; 5, countersunk screw hole; 6, lining cover hole; 31, protection pin step end. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-4 The present invention provides a technical solution: comprising a lining cover 1, an axial hole 2 is opened on one side of the lining cover 1, a plurality of protective pins 3 are connected and arranged on one side of the lining cover 1, a punching rivet end 4 is provided on one side of the lining cover 1, and a countersunk screw hole 5 is opened on one side of the lining cover 1.

[0026] A lining cover hole 6 is opened on one side of the lining cover 1, and a protection pin step end 31 is connected to one end of the protection pin 3. One end of the protection pin 3 extends into the lining cover hole 6, and one end of the protection pin step end 31 passes through the lining cover hole 6 and is embedded, wherein the protection pin 3 and the lining cover hole 6 are interference fit, and at the same time, one end of the protection pin step end 31 passes through the lining cover hole 6, thereby achieving a limiting effect on the rotor hub.

[0027] A head-hiding groove is provided on one side of the countersunk screw hole 5 to facilitate installation of the countersunk screw, thereby achieving a countersunk effect.

[0028] One end of the protection pin 3 is chamfered, and the other end is stepped, which is convenient for assembling and installing 3.

[0029] A recessed end is provided on one side of the liner cover 1 corresponding to the shaft hole 2 to ensure the connection and fit between 1 and the turbine casing.

[0030] A method for using a turbine rotor passive brake protection comprises the following steps:

[0031] Step 1: Install the liner 1 into the installation fixture, and install the protection pin 3 into the fixture in turn. The inner angle direction of the step end 31 of the protection pin should be facing the direction of the turbine rotor, and then use the matching punch to press it into the liner hole 6. Here, it is an interference fit. The end face of the step end 31 of the protection pin is higher than the end face of the liner 1. This length has a great influence on the braking effect of the turbine rotor and needs to be accurately calculated during the design.

[0032] Step 2: After all the protection pins 3 are installed, install the pressure plate on the installation fixture, and perform riveting on the lining cover 1. After riveting, ensure that the protection pin 3 is not loose, and the lining cover hole 6 fits the step end 31 of the protection pin. After riveting, remove the flange and burr of the riveted end 4. Finally, check that there should be no pressure damage, cracking, etc. on the surface of the parts. The assembly of the lining cover 1 is completed.

[0033] Step 3: In the air turbine starter, the rotor protection liner is installed on the front end of the turbine casing, the shaft of the turbine rotor passes through the shaft hole 2 in the middle of the liner 1 and extends into the turbine casing, the wheel disc of the turbine rotor is in front of the liner 1, and the bearing is assembled on the shaft of the turbine rotor in the turbine casing;

[0034] Step 4: When installing the lining cover 1 on the turbine casing, make sure that the countersunk screw hole 5 is aligned with the mounting hole on the turbine casing, insert the protection pin 3 into the pin hole on the turbine casing assembly, which is a clearance fit, and then pass the countersunk screw through the countersunk screw hole 5 and tighten it. Check whether the lining cover 1 is installed in place and whether there is any gap around it;

[0035] Step 5. When the air turbine starter is in use, if the bearing on the turbine rotor fails, the turbine rotor will experience axial and radial vibration and shaking. In this case, the turbine rotor hub will scratch the step end 31 of the protective pin extending from one side of the liner 1 to stop the rotor from rotating, thereby achieving the effect of passive braking of the turbine rotor.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A turbine rotor passive brake protection device, comprising a liner cover (1), characterized in that: One side of the lining cover (1) is provided with an axial hole (2), one side of the lining cover (1) is connected with a plurality of protection pins (3), one side of the lining cover (1) is provided with a punching riveting end (4), and one side of the lining cover (1) is provided with a countersunk screw hole (5).

2. A turbine rotor passive braking protection device according to claim 1, characterized in that: A lining cover hole (6) is provided on one side of the lining cover (1); one end of the protection pin (3) is connected to a protection pin step end (31); one end of the protection pin (3) extends into the lining cover hole (6); and one end of the protection pin step end (31) penetrates the lining cover hole (6) and is engaged therewith.

3. A turbine rotor passive braking protection device according to claim 1, characterized in that: A head-hiding groove is provided on one side of the countersunk screw hole (5).

4. A turbine rotor passive braking protection device according to claim 1, characterized in that: One end of the protection pin (3) is provided with a chamfer, and the other end is arranged in a step shape.

5. A turbine rotor passive braking protection device according to claim 1, characterized in that: A recessed end is provided on one side of the lining cover (1) corresponding to the shaft hole (2).

6. A method for using a turbine rotor passive brake protection, comprising the following steps: Step 1: Install the liner (1) into the installation fixture, and install the protection pin (3) into the fixture in turn. The inner angle direction of the step end (31) of the protection pin should be facing the direction of the turbine rotor, and then use a matching punch to press it into the liner hole (6). Here, it is an interference fit. The end face of the step end (31) of the protection pin is higher than the end face of the liner (1). This length has a great influence on the braking effect of the turbine rotor and needs to be accurately calculated during design. Step 2: After all the protection pins (3) are installed, install the pressure plate on the installation fixture, and perform riveting on the lining cover (1). After riveting, ensure that the protection pin (3) is not loose, and the lining cover hole (6) fits the step end (31) of the protection pin. After riveting, remove the flange and burr of the riveted end (4). Finally, check that there is no pressure injury or cracking on the surface of the parts. The assembly of the lining cover (1) is completed. Step 3: In the air turbine starter, the rotor protection liner is installed on the front end of the turbine casing, the shaft of the turbine rotor passes through the shaft hole (2) in the middle of the liner (1) and extends into the turbine casing, the wheel disc of the turbine rotor is in front of the liner (1), and the bearing is assembled on the shaft of the turbine rotor in the turbine casing; Step 4: When installing the lining cover (1) on the turbine casing, make sure that the countersunk screw hole (5) is aligned with the mounting hole on the turbine casing. Insert the protection pin (3) into the pin hole on the turbine casing assembly. There is a clearance fit here. Then pass the countersunk screw through the countersunk screw hole (5) and tighten it. Check whether the lining cover (1) is installed in place and whether there is any gap around it. Step 5. When the air turbine starter is in use, if the bearing on the turbine rotor fails, the turbine rotor will experience axial and radial vibration and shaking. In this case, the turbine rotor hub will scratch the step end (31) of the protective pin extending from one side of the liner (1) to stop the rotor from rotating, thereby achieving the effect of passively braking the turbine rotor.

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