A turbine pump shafting rotating device for liquid rocket engine

Abstract

The present application relates to a kind of turbine pump shafting rotating device for liquid rocket engine, belong to the technical field of rocket engine turbine pump assembly.Transferring flange is used to butt joint variable speed motor assembly with turbine pump shell;Transferring flange is installed on variable speed motor assembly by connecting bolt;Spring washer and flat washer are respectively installed between connecting bolt and transferring flange, wherein spring washer is installed between connecting bolt and flat washer to prevent bolt loosening;Flat washer is installed between spring washer and transferring flange;Variable speed motor assembly is connected with adapter through torque flat key, the rotating speed and torque of variable speed motor assembly are transmitted to turbine pump internal shaft through adapter, to drive turbine pump internal shaft rotating;Transferring flange is fixed with the turbine pump shell to be rotated by connecting stud and connecting nut.The present application is simple in process, easy to operate, and can effectively improve the quality and service life of turbine pump.

Description

Technical Field

[0001] This invention belongs to the field of rocket engine turbopump assembly technology, and relates to a turbopump shaft rotation device for liquid rocket engines. Background Technology

[0002] Currently, liquid rocket engines widely employ pump-pressurized propellant supply systems, with the turbopump being a key component, often referred to as the "heart" of the rocket engine. The performance and reliability of the turbopump directly impact the payload capacity and reliability of the engine and even the space launch vehicle. The turbine end shaft seal utilizes a combined sealing scheme, consisting of a detachable end-face seal and a labyrinth seal. During the pre-cooling phase, the stationary ring of the detachable end-face seal adheres to the moving ring under the force of a spring, sealing the liquid oxygen medium. During engine operation, under the influence of high-pressure liquid oxygen introduced from the oxygen pump outlet, when the pressure difference across the detachable seal reaches the detachment pressure, the sealing end face opens, forming a channel. Liquid oxygen then enters the turbine cavity after being throttled by the labyrinth seal, effectively blocking the turbine combustion gases. When the engine shuts down, as the oxygen pump outlet pressure decreases, when the pressure difference across the detachable seal decreases to the closing pressure, the sealing end face recloses, achieving static sealing performance. This sealing ring structure has been successfully applied in the flight launches of multiple models of the Long March series rockets and weapons.

[0003] Due to product differences, as the operating time of the turbopump increases, the seals in the turbopump will wear down, leading to seal failure. This affects the service life of the turbopump and even the engine, making it impossible to achieve the sealing effect and increasing the time cost and economic cost of scrapping. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a turbine pump shaft rotation device for liquid rocket engines. The device is simple to manufacture, easy to operate, and can effectively improve the quality and service life of the turbine pump.

[0005] The solution of the present invention is:

[0006] A turbine pump shaft rotation device for a liquid rocket engine includes connecting bolts, spring washers, flat washers, an adapter flange, a variable speed motor assembly, a turbine pump, connecting studs, connecting nuts, an adapter, and a torque key. The adapter flange is used to mate the variable speed motor assembly with the turbine pump housing. The adapter flange is mounted on the variable speed motor assembly via connecting bolts. Spring washers and flat washers are installed between the connecting bolts and the adapter flange, respectively, wherein the spring washers are installed between the connecting bolts and the flat washers to prevent the bolts from loosening; the flat washers are installed between the spring washers and the adapter flange.

[0007] The variable speed motor assembly is connected to the adapter via a torque key; this allows the speed and torque of the variable speed motor assembly to be transmitted to the internal shaft system of the turbine pump via the adapter, driving the internal shaft system of the turbine pump to rotate; the adapter flange is fixed to the turbine pump housing to be rotated via connecting studs and connecting nuts.

[0008] In the aforementioned turbine pump shaft rotation device for a liquid rocket engine, spring washers prevent the connecting bolts from loosening; flat washers reduce the compressive stress on the bearing surface of the connecting bolts and protect the surface of the transition flange.

[0009] In the aforementioned rotating device for a turbopump shaft system of a liquid rocket engine, the transition flange includes a lower connecting flange, a clearance step, a lower connecting circular hole, an upper connecting flange, and a circular hole. The lower connecting flange is a horizontally placed square plate structure. The lower connecting flange has an upwardly protruding clearance step positioned opposite the speed-changing motor assembly. A lower connecting circular hole is provided at each of the four corners of the lower connecting flange to achieve a fixed connection between the lower connecting flange and the speed-changing motor assembly. The upper connecting flange is located at the top of the clearance step. The upper connecting flange is a circular plate structure. An axially vertical circular hole is provided at the center of the upper connecting flange. Upper connecting circular holes are evenly distributed along the axial direction on the surface of the upper connecting flange. The transition flange is fixedly connected to the turbopump housing through the upper connecting circular holes.

[0010] In the aforementioned turbine pump shaft rotation device for a liquid rocket engine, the diameter of the lower connecting circular hole is 9mm; the clearance step is used to avoid the top of the variable speed motor assembly.

[0011] In the aforementioned turbine pump shaft rotation device for a liquid rocket engine, the clearance step is a frustum-shaped structure; the distance between the axis of the clearance step and the vertical centerline of the lower connecting flange is 22mm. This eccentric design avoids interference when the variable speed motor assembly is installed with the turbine pump.

[0012] In the aforementioned turbine pump shaft rotation device for a liquid rocket engine, the variable speed motor assembly includes a stator housing and a main shaft; the stator housing is a cuboid structure; the stator housing is placed vertically; the main shaft extends from the top of the stator housing and is coaxial with the clearance step.

[0013] In the aforementioned turbine pump shaft rotation device for a liquid rocket engine, a threaded hole is provided at each of the four corners of the top of the stator housing, which is connected to the lower connecting round hole of the adapter flange by connecting bolts; a keyway is provided on the side wall of the main shaft for embedding and installing a torque transmission key.

[0014] In the aforementioned turbine pump shaft rotation device for a liquid rocket engine, the power of the variable speed motor assembly is 400W, the reduction ratio is 25, the main shaft speed is 56rpm, and the generated torque is 56.6N·m.

[0015] In the aforementioned liquid rocket engine turbopump shaft rotation device, the adapter includes a first cylindrical section, a second cylindrical section, a third cylindrical section, a conical section, five rotating teeth, and a keyway (96);

[0016] The first cylindrical section is coaxially disposed in the circular hole; the first cylindrical section and the circular hole are clearance fitted; the inner sidewall of the first cylindrical section is provided with a groove for installing a torque key; the second cylindrical section is coaxially disposed on the top of the first cylindrical section; the third cylindrical section is coaxially disposed on the top of the second cylindrical section; the conical section is disposed on the top of the third cylindrical section, and the small diameter end of the conical section is set downward; five rotating teeth are evenly disposed circumferentially on the outer edge of the top of the conical section.

[0017] In the aforementioned turbine pump shaft rotation device for a liquid rocket engine, the diameter of the second cylindrical section is larger than the diameter of the circular hole, allowing impurities to enter the lower variable speed motor assembly; the diameter of the third cylindrical section is smaller than the inner hole of the turbine pump housing, enabling the adapter to extend into the turbine pump housing; the length of the rotating tooth is 13mm and the width is 4.8mm; the rotating tooth connects with the internal shaft components of the turbine pump.

[0018] The advantages of this invention compared to the prior art are:

[0019] (1) When installing the turbine pump shaft rotation device for liquid rocket engine of the present invention, the speed change motor assembly and the turbine pump interface are different. In order to connect the speed change motor assembly and the turbine pump, a special adapter flange is designed and manufactured. The speed change motor assembly is connected to the lower connecting flange in the adapter flange by connecting bolts, spring washers and flat washers. The upper interface of the turbine pump is connected to the upper connecting flange in the adapter flange by connecting studs and connecting nuts, so as to achieve a rigid connection between the speed change motor assembly and the turbine pump.

[0020] (2) The turbopump shaft rotation device for liquid rocket engine of the present invention transmits the rotation speed and torque of the variable speed motor assembly to the turbopump shaft through an adapter to realize the rotation of the turbopump shaft.

[0021] (3) The turbopump shaft rotation device for liquid rocket engine of the present invention changes the sealing state of turbopump by rotating the turbopump shaft, which creatively solves the problem of improving turbopump sealing without disassembling the engine. No extra material is generated during the rotation process, which can effectively avoid the problem of extra material in turbopump and improve engine quality and reliability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall rotating device of the present invention;

[0023] Figure 2 This is a schematic diagram of the adapter flange structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the variable speed motor assembly structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the adapter structure of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Connecting bolts;

[0028] 2. Spring washers;

[0029] 3. Flat washers;

[0030] 4. Adapter flange; 41. Lower connecting flange; 42. Clearance step; 43. Lower connecting round hole; 44. Upper connecting flange; 45. Round hole; 46. Upper connecting round hole;

[0031] 5. Variable speed motor assembly; 51. Including stator housing; 52. Main shaft; 53. Threaded hole; 54. Keyway;

[0032] 6. Pump casing;

[0033] 7. Connecting studs;

[0034] 8. Connecting nuts;

[0035] 9. Adapter; 91. First cylinder; 92. Second cylinder; 93. Third cylinder; 94. Cone; 95. Rotating tooth; 96. Flat keyway;

[0036] 10. Torque key. Detailed Implementation

[0037] The present invention will be further described below with reference to the embodiments.

[0038] This invention provides a turbine pump shaft rotation device for liquid rocket engines, which improves the sealing quality and service life of the turbine pump. By manufacturing a special shaft rotation device, the turbine pump shaft is rotated at rated speed, rated torque and rated power, thereby changing the sealing contact state to meet the usage requirements.

[0039] Turbopump shaft rotation device for liquid rocket engines, such as Figure 1As shown, the assembly specifically includes connecting bolt 1, spring washer 2, flat washer 3, adapter flange 4, variable speed motor assembly 5, turbine pump 6, connecting stud 7, connecting nut 8, adapter 9, and torque key 10. The adapter flange 4 is used to connect the variable speed motor assembly 5 to the turbine pump 6 housing. The adapter flange 4 is installed on the variable speed motor assembly 5 by connecting bolt 1. Spring washer 2 and flat washer 3 are installed between connecting bolt 1 and adapter flange 4, respectively. Spring washer 2 is installed between connecting bolt 1 and flat washer 3 to prevent bolt loosening. Flat washer 3 is installed between spring washer 2 and adapter flange 4. Spring washer 2 prevents connecting bolt 1 from loosening. Flat washer 3 reduces the compressive stress on the bearing surface of connecting bolt 1 and protects the surface of adapter flange 4.

[0040] The rotation of the variable speed motor assembly is used to drive the turbine pump shaft to rotate via an adapter, thereby achieving the rotation of the turbine pump shaft.

[0041] The variable speed motor assembly 5 is connected to the adapter 9 via the torque key 10; thus, the speed and torque of the variable speed motor assembly 5 are transmitted to the internal shaft system of the turbine pump 6 via the adapter 9, driving the internal shaft system of the turbine pump 6 to rotate; the adapter flange 4 is fixedly connected to the housing of the turbine pump 6 to be rotated via the connecting stud 7 and the connecting nut 8.

[0042] The structure of the adapter flange 4 is as follows Figure 2 As shown, the assembly specifically includes a lower connecting flange 41, a clearance step 42, a lower connecting circular hole 43, an upper connecting flange 44, a circular hole 45, and an upper connecting circular hole 46. The lower connecting flange 41 is a horizontally placed square plate structure. The lower connecting flange 41 has an upwardly protruding clearance step 42 at the position corresponding to the variable speed motor assembly 5. Each of the four corners of the lower connecting flange 41 has a lower connecting circular hole 43 to achieve a fixed connection between the lower connecting flange 41 and the variable speed motor assembly 5. The upper connecting flange 44 is located on top of the clearance step 42. The upper connecting flange 44 is a circular plate structure. The center of the upper connecting flange 44 has an axially vertical circular hole 45. The surface of the upper connecting flange 44 is evenly provided with upper connecting circular holes 46 along the axial direction. The upper connecting circular holes 46 achieve a fixed connection between the adapter flange 4 and the turbine pump 6 housing. The diameter of the lower connecting circular hole 43 is 9mm. The clearance step 42 is used to avoid the top of the variable speed motor assembly 5.

[0043] The clearance step 42 is a frustum-shaped structure; the distance between the axis of the clearance step 42 and the vertical center line of the lower connecting flange 41 is 22mm. This eccentric design avoids interference when the variable speed motor assembly 5 and the turbine pump 6 are installed together.

[0044] like Figure 3As shown, the variable speed motor assembly 5 includes a stator housing 51 and a main shaft 52; the stator housing 51 has a cuboid structure; the stator housing 51 is placed vertically; the main shaft 52 extends from the top of the stator housing 51 and is coaxial with the clearance step 42.

[0045] The stator housing 51 has a threaded hole 53 at each of the four corners of its top, which is connected to the lower connecting hole 43 of the adapter flange 4 by connecting bolts 1; the main shaft 52 has a keyway 54 on its side wall for embedding and installing the torque transmission key 10.

[0046] Each of the four corners of the stator housing 51 has an M8×1.25-6H threaded hole 53 for installing the connecting bolt 1; the stator housing 51 is equipped with a main shaft 52, which is offset by 22mm from the center line of the stator housing 51 along the length direction and is located on the center line along the width direction for connecting with the adapter flange 4. The outer circle of the main shaft 52 is provided with a keyway 54 along the height direction for installing the torque transmission key 10 to transmit torque and speed to the adapter 9 and finally drive the turbine pump 6 shaft system to rotate through the adapter 9.

[0047] The variable speed motor assembly 5 has a power of 400W and a reduction ratio of 25; the main shaft 52 has a speed of 56rpm and generates a torque of 56.6N·m.

[0048] The adapter 9 is made of 45 steel, and requires quenching and tempering heat treatment to meet strength requirements. For example... Figure 4 As shown, the adapter 9 includes a first cylindrical section 91, a second cylindrical section 92, a third cylindrical section 93, a conical section 94, five rotating teeth 95, and a keyway 96. The first cylindrical section 91 is coaxially disposed in the circular hole 45; the first cylindrical section 91 and the circular hole 45 are clearance-fitted; the inner sidewall of the first cylindrical section 91 is provided with a groove 96 for installing the torque transmission key 10; the second cylindrical section 92 is coaxially disposed on the top of the first cylindrical section 91; the third cylindrical section 93 is coaxially disposed on the top of the second cylindrical section 92; the conical section 94 is disposed on the top of the third cylindrical section 93, and the small diameter end of the conical section 94 is oriented downwards; the five rotating teeth 95 are evenly disposed circumferentially along the outer edge of the top of the conical section 94.

[0049] The diameter of the second cylindrical section 92 is larger than the diameter of the circular hole 45, allowing impurities to enter the lower variable speed motor assembly 5; the diameter of the third cylindrical section 93 is smaller than the inner hole of the turbine pump 6 housing, allowing the adapter 9 to extend into the turbine pump 6 housing; the length of the rotating tooth 95 is 13mm and the width is 4.8mm; the rotating tooth 95 is used to connect with the internal shaft parts of the turbine pump 6.

[0050] The first cylindrical section 91 of the adapter 9 and the circular hole 45 of the adapter flange 4 are clearance-fitted to ensure that the adapter 9 rotates relative to the stationary adapter flange 4, following the rotational motion of the variable speed motor assembly 9.

[0051] A process for rotating the shaft system of a turbopump used in a liquid rocket engine includes the following steps:

[0052] (1) Open the corresponding interface of the turbo pump and wipe it to ensure that there are no foreign objects;

[0053] (2) Adjust the turbine pump shaft rotation device according to... Figure 2 As shown, first assemble and adjust the position of the rotating teeth 95 on the adapter 9 so that the five rotating teeth 95 are aligned with the turbine pump shaft system parts, and then connect the shaft system rotating device to the turbine pump 6 through the connecting stud 7 and connecting nut 8.

[0054] (3) To prevent the shaft rotation device from interfering with other parts of the engine, the shaft rotation device is an eccentric structure, with the short shaft of the adapter flange 4 and the speed change motor assembly 5 facing the engine and the long shaft away from the engine.

[0055] (4) Adjust the variable speed motor assembly 5 so that the speed of its main shaft 52 is 56 rpm and the torque is 56.6 Nm. The main shaft 52 rotates counterclockwise to realize the rotation of the turbine pump 6 shaft system, change the sealing and contact state of the turbine pump 6, and achieve the requirement of repeated use.

[0056] The turbine pump shaft rotation device for liquid rocket engines provided by this invention is used to rotate the turbine pump. The process is simple and easy to operate, and it can effectively improve the quality and service life of the turbine pump.

[0057] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A rotating device for a turbopump shaft system in a liquid rocket engine, characterized in that: The assembly includes connecting bolts (1), spring washers (2), flat washers (3), adapter flanges (4), variable speed motor assembly (5), turbine pump (6), connecting studs (7), connecting nuts (8), adapters (9), and torque transmission keys (10). The adapter flange (4) is used to connect the variable speed motor assembly (5) to the turbine pump (6) housing. The adapter flange (4) is installed on the variable speed motor assembly (5) by connecting bolts (1). Spring washers (2) and flat washers (3) are installed between the connecting bolts (1) and the adapter flange (4), respectively. The spring washers (2) are installed between the connecting bolts (1) and the flat washers (3) to prevent the bolts from loosening. The flat washers (3) are installed between the spring washers (2) and the adapter flange (4). The variable speed motor assembly (5) is connected to the adapter (9) via the torque key (10); the speed and torque of the variable speed motor assembly (5) are transmitted to the internal shaft system of the turbine pump (6) via the adapter (9), thereby driving the internal shaft system of the turbine pump (6) to rotate; the adapter flange (4) is fixedly connected to the housing of the turbine pump (6) to be rotated via the connecting stud (7) and the connecting nut (8); The adapter flange (4) includes a lower connecting flange (41), a clearance step (42), a lower connecting circular hole (43), an upper connecting flange (44), a circular hole (45), and an upper connecting circular hole (46); the lower connecting flange (41) is a horizontally placed square plate structure; the lower connecting flange (41) is provided with an upwardly protruding clearance step (42) corresponding to the position of the variable speed motor assembly (5); a lower connecting circular hole (43) is provided at each of the four corners of the lower connecting flange (41) to realize the fixed connection between the lower connecting flange (41) and the variable speed motor assembly (5); the upper connecting flange (44) is located on the top of the clearance step (42); the upper connecting flange (44) is a circular plate structure; a vertically axial circular hole (45) is provided at the center of the upper connecting flange (44); the upper connecting flange (44) is uniformly provided with upper connecting circular holes (46) along the axial direction on the surface of the upper connecting flange (44); the adapter flange (4) is fixedly connected to the housing of the turbine pump (6) through the upper connecting circular holes (46); The adapter (9) includes a first cylindrical section (91), a second cylindrical section (92), a third cylindrical section (93), a conical section (94), five rotating teeth (95), and a flat keyway (96). The first cylindrical section (91) is coaxially disposed in the circular hole (45); the first cylindrical section (91) and the circular hole (45) are clearance-fitted; the inner wall of the first cylindrical section (91) is provided with a groove (96) for installing a torque key (10); the second cylindrical section (92) is coaxially disposed on the top of the first cylindrical section (91); the third cylindrical section (93) is coaxially disposed on the top of the second cylindrical section (92); the conical section (94) is disposed on the top of the third cylindrical section (93), and the small diameter end of the conical section (94) is disposed downward; five rotating teeth (95) are evenly disposed circumferentially on the outer edge of the top of the conical section (94); The diameter of the second cylindrical section (92) is larger than the diameter of the circular hole (45) to allow impurities to enter the lower variable speed motor assembly (5).

2. The turbine pump shaft rotation device for a liquid rocket engine according to claim 1, characterized in that: Spring washers (2) prevent the connecting bolts (1) from loosening; flat washers (3) reduce the compressive stress on the bearing surface of the connecting bolts (1) and protect the surface of the transition flange (4).

3. The turbine pump shaft rotation device for a liquid rocket engine according to claim 1, characterized in that: The diameter of the lower connecting hole (43) is 9mm; the avoidance step (42) is used to avoid the top of the variable speed motor assembly (5).

4. The turbine pump shaft rotation device for a liquid rocket engine according to claim 3, characterized in that: The avoidance step (42) is a frustum-shaped structure; the distance between the axis of the avoidance step (42) and the vertical center line of the lower connecting flange (41) is 22mm. This eccentric design avoids interference when the variable speed motor assembly (5) and the turbine pump (6) are connected and installed.

5. The turbine pump shaft rotation device for a liquid rocket engine according to claim 2, characterized in that: The variable speed motor assembly (5) includes a stator housing (51) and a main shaft (52); the stator housing (51) is a cuboid structure; the stator housing (51) is placed vertically; the main shaft (52) extends from the top of the stator housing (51) and is coaxial with the clearance step (42).

6. The turbine pump shaft rotation device for a liquid rocket engine according to claim 5, characterized in that: The stator housing (51) has a threaded hole (53) at each of the four corners of the top, which is connected to the lower connecting round hole (43) of the adapter flange (4) by connecting bolts (1); the side wall of the main shaft (52) is provided with a keyway (54) for embedding and installing the torque transmission key (10).

7. The turbine pump shaft rotation device for a liquid rocket engine according to claim 5, characterized in that: The variable speed motor assembly (5) has a power of 400W and a reduction ratio of 25; the main shaft (52) rotates at 56 rpm and generates a torque of 56.6 rpm. .

8. The turbine pump shaft rotation device for a liquid rocket engine according to claim 1, characterized in that: The diameter of the third cylindrical section (93) is smaller than the inner hole of the turbine pump (6) housing, so that the adapter (9) can be inserted into the turbine pump (6) housing; the length of the rotating tooth (95) is 13mm and the width is 4.8mm; the rotating tooth (95) is connected to the internal shaft parts of the turbine pump (6).

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