A low pressure turbine casing arrangement which facilitates ease of maintenance

Abstract

This utility model relates to the field of low-pressure turbine technology and discloses a low-pressure turbine casing device that is easy to disassemble and maintain. It includes an upper shell, with a lower shell at the bottom of the upper shell. Both the upper and lower shells have slots inside, and a fixing structure is installed inside each slot. This easy-to-disassemble and maintain low-pressure turbine casing device uses an external thread on the outer wall of the rotating rod to connect with an internal thread on the inner wall of the sleeve rod, converting the rotational motion of the knob into the axial linear motion of the rotating rod. No external tools such as wrenches are needed; the fixing structure can be locked or unlocked simply by manually rotating the knob. A ball bearing is installed in a circular hole at the bottom of the sleeve rod, and a fixing groove matching the ball bearing is provided in the lower shell. Both are horizontally aligned. When locking, the ball bearing is pressed into the fixing groove by a pusher block, forming a multi-point uniformly stressed annular locking structure. This avoids the localized stress concentration problem of traditional single-screw fixing and reduces the risk of casing deformation.

Description

Technical Field

[0001] This utility model relates to the field of low-pressure turbine technology, specifically to a low-pressure turbine casing device that is easy to disassemble and maintain. Background Technology

[0002] In the field of aero-engines and industrial gas turbines, the low-pressure turbine casing, as a core structural component, plays an important role in housing the turbine rotor, guiding the airflow direction, supporting internal components, and withstanding high-temperature and high-pressure loads. Its working environment is complex, and it needs to withstand gas erosion, vibration and shock, and temperature gradient changes for a long time. Therefore, regular maintenance and component replacement are key links to ensure equipment reliability.

[0003] The existing low-pressure turbine casings mostly use a traditional bolt fastening structure for the connection between the upper and lower shells. This involves multiple bolts distributed circumferentially through the flanges of the upper and lower shells, which are then locked together with nuts. While this structure can meet the connection strength requirements, it has significant drawbacks in the maintenance process. Disassembly requires the use of a wrench to loosen each bolt individually, and installation requires tightening each bolt individually again to ensure uniform torque. The operation is complicated, especially in the confined installation space of the engine, where tool access is limited. This results in a single maintenance session taking up to 1 hour, which seriously affects the equipment turnover efficiency. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a low-pressure turbine casing device that is easy to disassemble and maintain. It has the advantage of being able to be quickly disassembled without the aid of external tools, thus solving the problem that traditional equipment using screws and nuts requires external tools for disassembly.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a low-pressure turbine casing device that is easy to disassemble and maintain, comprising an upper shell, a lower shell being provided at the bottom of the upper shell, slots being provided inside both the upper shell and the lower shell, heat dissipation holes being provided outside the upper shell, and a fixing structure being provided inside the slots;

[0006] The fixing structure includes a knob, a rotating rod, a spring, a push block, a sleeve rod, a bearing, and a ball bearing. The slot contacts the outer wall of the sleeve rod. The bottom of the knob is fixedly connected to the rotating rod, the bottom of the rotating rod is fixedly connected to the spring, the bottom of the spring is fixedly connected to the push block, and the outer side of the push block contacts a ball bearing. A sleeve rod is provided on the outside of the rotating rod, and a circular hole is opened inside the sleeve rod.

[0007] Preferably, the outer wall of the rotating rod is provided with external threads, the inner wall of the sleeve is provided with internal threads, and the rotating rod and the sleeve are threadedly connected.

[0008] Preferably, the lower shell has a fixing groove inside, the ball is located inside the circular hole, the fixing groove is adapted to the ball, and the fixing groove is horizontally aligned with the circular hole.

[0009] Preferably, a limiting block is fixedly connected to the outside of the circular hole, and the limiting block is adapted to the ball bearing.

[0010] Preferably, a bearing is fixedly connected to the lower bottom wall of the sleeve rod, and the bottom of the push block is fixedly connected to the inner ring of the bearing.

[0011] Preferably, there are six round holes and six balls, evenly distributed around the bottom of the sleeve rod. The slot inside the upper shell penetrates the upper shell, and the sleeve rod extends through the upper shell to the slot inside the lower shell.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0013] This easy-to-disassemble and maintain low-pressure turbine casing device converts the rotational motion of the knob into the axial linear motion of the knob by connecting the external thread on the outer wall of the rotating rod with the internal thread on the inner wall of the sleeve rod. No external tools such as wrenches are needed; the fixing structure can be locked or unlocked simply by manually rotating the knob. A ball bearing is installed in the circular hole at the bottom of the sleeve rod, and a fixing groove that matches the ball bearing is opened in the lower shell. Both are horizontally aligned. When locking, the ball bearing is pressed into the fixing groove by the push block, forming a ring-shaped locking structure with multiple points of uniform force. This avoids the local stress concentration problem of traditional single-screw fixing and can better adapt to the vibration and temperature changes during the operation of the low-pressure turbine, reducing the risk of casing deformation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a sectional view of the connection between the card slot and the fixing structure of this utility model;

[0016] Figure 3 This is a three-dimensional view of the fixed structure of this utility model;

[0017] Figure 4 for Figure 2 Enlarged view of point A in the middle.

[0018] In the diagram: 1. Upper shell; 2. Lower shell; 201. Slot; 202. Fixing slot; 3. Heat dissipation hole; 5. Fixing structure; 501. Rotary knob; 502. Rotating rod; 5021. External thread; 503. Spring; 504. Push block; 505. Sleeve rod; 5051. Internal thread; 5052. Limiting block; 5053. Round hole; 506. Bearing; 507. Ball bearing. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 This embodiment provides a low-pressure turbine casing device that is easy to disassemble and maintain, including an upper shell 1, a lower shell 2 at the bottom of the upper shell 1, a slot 201 inside both the upper shell 1 and the lower shell 2, a heat dissipation hole 3 outside the upper shell 1, and a fixing structure 5 inside the slot 201.

[0021] The fixed structure 5 includes a knob 501, a rotating rod 502, a spring 503, a push block 504, a sleeve rod 505, a bearing 506, and a ball bearing 507. The slot 201 contacts the outer wall of the sleeve rod 505. The bottom of the knob 501 is fixedly connected to the rotating rod 502. The bottom of the rotating rod 502 is fixedly connected to the spring 503. The bottom of the spring 503 is fixedly connected to the push block 504. The outer side of the push block 504 contacts the ball bearing 507. The sleeve rod 505 is provided on the outside of the rotating rod 502. A round hole 5053 is opened inside the sleeve rod 505.

[0022] The outer wall of the rotating rod 502 is provided with an external thread 5021, and the inner wall of the sleeve rod 505 is provided with an internal thread 5051. The rotating rod 502 and the sleeve rod 505 are threadedly connected. Through the cooperation of the external thread 5021 and the internal thread 5051, the rotational motion of the rotating rod 502 is converted into axial linear motion. When the knob 501 is rotated, the rotating rod 502 can move up and down precisely relative to the sleeve rod 505, thereby pushing the push block 504 to compress or release the spring 503, providing a stable driving force for the ball 507 to be inserted into and released from the fixing groove 202, and ensuring the operational controllability of the fixing structure 5.

[0023] The lower shell 2 has a fixing groove 202 inside, and the ball 507 is located inside the round hole 5053. The fixing groove 202 is adapted to the ball 507. The fixing groove 202 and the round hole 5053 are horizontally aligned. The fixing groove 202 provides a precise snap-fit ​​position for the ball 507. Its compatibility with the ball 507 ensures that the two fit tightly together, realizing the mechanical locking of the upper shell 1 and the lower shell 2. The horizontal alignment ensures that the ball 507 can be accurately aligned with the fixing groove 202 during assembly, avoiding connection failure due to misalignment and improving structural reliability.

[0024] A limiting block 5052 is fixedly connected to the outside of the round hole 5053. The limiting block 5052 is adapted to the ball 507. The limiting block 5052 restricts the radial displacement range of the ball 507, preventing the ball 507 from falling out of the round hole 5053, especially during the spring 503 rebound stage when disassembling. This ensures the integrity of the fixing structure 5 and avoids failure of the casing connection due to the loss of the ball 507.

[0025] A bearing 506 is fixedly connected to the lower bottom wall of the sleeve rod 505. The bottom of the push block 504 is fixedly connected to the inner ring of the bearing 506. The bearing 506 isolates the rotational movement of the push block 504, so that when the rotating rod 502 rotates, the push block 504 only moves axially and does not rotate with the rotating rod 502. This avoids uneven force on the balls 507 caused by the rotation of the push block 504, ensures that each ball 507 receives a consistent thrust, and improves the stability of the fixed structure 5.

[0026] There are six round holes 5053 and six ball bearings 507, which are evenly distributed around the bottom of the sleeve rod 505. The slot 201 inside the upper shell 1 passes through the upper shell 1, and the sleeve rod 505 passes through the upper shell 1 and extends into the slot 201 inside the lower shell 2. The six evenly distributed ball bearings 507 make the connection between the upper shell 1 and the lower shell 2 evenly stressed. The through-hole design of the sleeve rod 505 ensures that the fixing structure 5 acts on the slot 201 of the upper and lower shells 2 at the same time, forming a through-hole connection, which further improves the connection strength and sealing of the upper and lower shells 2.

[0027] When implementing this procedure, please follow these steps:

[0028] 1) First, align the slot 201 of the upper shell 1 with the slot 201 of the lower shell 2 to ensure that the sleeve rod 505 can pass smoothly through the slot 201 of the upper shell 1 and be inserted into the slot 201 of the lower shell 2. At this time, the round hole 5053 at the bottom of the sleeve rod 505 and the fixing groove 202 of the lower shell 2 are at the same horizontal position.

[0029] 2) Then confirm that the fixing structure 5 is in a relaxed state: the rotating rod 502 is not tightened, the spring 503 is in a naturally extended state, the push block 504 does not squeeze the ball 507, and the ball 507 is completely stored in the round hole 5053.

[0030] 3) Turn the knob 501 clockwise to drive the rotating rod 502 to rotate synchronously. Since the external thread 5021 of the rotating rod 502 meshes with the internal thread 5051 of the sleeve rod 505, the rotating rod 502 moves downward along the inner wall of the sleeve rod 505, compressing the spring 503. The elastic force of the spring 503 pushes the push block 504 downward. The push block 504 maintains axial movement without rotation through the bearing 506 at the bottom. Its inclined surface squeezes the ball 507, causing the ball 507 to slide outward along the round hole 5053. Finally, part of it protrudes from the outer wall of the sleeve rod 505 and is stuck in the fixing groove 202 of the lower shell 2.

[0031] 4) Finally, continue to rotate the knob 501 until it can no longer be tightened. At this time, the ball 507 is tightly fitted with the fixing groove 202, and the upper shell 1 and the lower shell 2 are completely locked by the fixing structure 5, thus completing the installation.

[0032] In summary, this easy-to-disassemble and maintain low-pressure turbine casing device converts the rotational motion of the knob 501 into the axial linear motion of the knob 502 by connecting the external thread 5021 on the outer wall of the rotating rod 502 with the internal thread 5051 on the inner wall of the sleeve rod 505. No external tools such as wrenches are needed; simply rotating the knob 501 manually drives the fixing structure 5 to lock or unlock. A ball bearing 507 is installed in the circular hole 5053 at the bottom of the sleeve rod 505, and a fixing groove 202 matching the ball bearing 507 is provided in the lower shell 2, with both positioned horizontally. When locked, the ball bearing 507 is pressed into the fixing groove 202 by the pusher block 504, forming a ring-shaped locking structure with multiple points of uniform force. This avoids the localized stress concentration problem of traditional single-screw fixing, better adapts to vibration and temperature changes during low-pressure turbine operation, and reduces the risk of casing deformation.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-pressure turbine casing assembly that is easy to disassemble and maintain, comprising an upper housing (1), characterized in that: The bottom of the upper shell (1) is provided with a lower shell (2). Both the upper shell (1) and the lower shell (2) are provided with slots (201). The exterior of the upper shell (1) is provided with heat dissipation holes (3). The slots (201) are provided with fixing structures (5). The fixing structure (5) includes a knob (501), a rotating rod (502), a spring (503), a push block (504), a sleeve rod (505), a bearing (506), and a ball (507). The slot (201) contacts the outer wall of the sleeve rod (505). The bottom of the knob (501) is fixedly connected to the rotating rod (502). The bottom of the rotating rod (502) is fixedly connected to the spring (503). The bottom of the spring (503) is fixedly connected to the push block (504). The outer side of the push block (504) contacts the ball (507). The sleeve rod (505) is provided on the outside of the rotating rod (502). A round hole (5053) is opened inside the sleeve rod (505).

2. The low-pressure turbine casing assembly for easy disassembly and maintenance according to claim 1, characterized in that: The outer wall of the rotating rod (502) is provided with an external thread (5021), and the inner wall of the sleeve rod (505) is provided with an internal thread (5051). The rotating rod (502) and the sleeve rod (505) are threadedly connected.

3. The low-pressure turbine casing assembly for easy disassembly and maintenance according to claim 1, characterized in that: The lower shell (2) has a fixing groove (202) inside, the ball (507) is located inside the round hole (5053), the fixing groove (202) is adapted to the ball (507), and the fixing groove (202) and the round hole (5053) are in the same horizontal position.

4. A low-pressure turbine casing assembly for easy disassembly and maintenance according to claim 1, characterized in that: A limiting block (5052) is fixedly connected to the outside of the circular hole (5053), and the limiting block (5052) is adapted to the ball (507).

5. A low-pressure turbine casing assembly for easy disassembly and maintenance according to claim 1, characterized in that: The lower bottom wall of the sleeve (505) is fixedly connected to a bearing (506), and the bottom of the push block (504) is fixedly connected to the inner ring of the bearing (506).

6. A low-pressure turbine casing assembly for easy disassembly and maintenance according to claim 3, characterized in that: The number of the circular holes (5053) and the ball bearings (507) are six in total, and they are evenly distributed around the bottom of the sleeve rod (505). The slot (201) inside the upper shell (1) penetrates the upper shell (1), and the sleeve rod (505) extends through the upper shell (1) to the inside of the slot (201) of the lower shell (2).

Images