A large-diameter split cast aluminum piston structure

Abstract

This utility model discloses a large-diameter split cast aluminum piston structure, including a piston rod, an upper piston body, a lower piston body, a locking nut washer, and a piston locking nut. The piston rod passes sequentially through the lower piston body, the upper piston body, and the locking nut washer, and is fastened together by the piston locking nut. The upper and lower piston bodies are pre-tightened and fixed to the piston rod by a hydraulic tensioner. Reinforcing ribs are provided on the split surfaces of the upper and lower piston bodies, and sand-removing holes are pre-reserved on the piston bodies. The aim is to solve the problems of large piston weight, complex sand-removing process, insufficient control of thermal deformation, and easy loosening of the plug in the prior art, thereby improving the reliability and service life of the piston.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, specifically to a large-diameter split cast aluminum piston structure. Background Technology

[0002] The compressor piston and cylinder together form the compression volume, requiring high strength, lightweight design, reliable sealing, and long service life. In existing technologies, large-diameter pistons often employ welded or integral cast aluminum structures, but these methods have the following drawbacks:

[0003] Welded piston: Made of steel plates, post-weld heat treatment can easily lead to uneven plate thickness, poor overall rigidity, and easy cracking during long-term operation.

[0004] Integral cast aluminum piston: Although it reduces weight, it requires sand removal holes, and the sand removal plugs are prone to loosening, posing a safety hazard; moreover, sand removal of large cast aluminum parts is difficult and the process is complicated.

[0005] Thermal deformation problem: Due to the difference in materials, the piston body and piston rod have different amounts of thermal expansion, which can easily lead to differences in radial deformation, affecting sealing performance and operational stability. Summary of the Invention

[0006] The purpose of this invention is to provide a large-diameter split cast aluminum piston structure in order to solve the technical problems existing in the background art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A large-diameter split cast aluminum piston structure includes a piston rod, an upper piston body, a lower piston body, a locking nut washer, and a piston locking nut. The piston rod passes sequentially through the lower piston body, the upper piston body, and the locking nut washer, and is fastened together by the piston locking nut. The upper piston body and the lower piston body are pre-tightened and fixed to the piston rod by a hydraulic tensioner. The split surfaces of the upper piston body and the lower piston body are provided with reinforcing ribs, and the piston body has pre-reserved sand-cleaning holes.

[0009] In some embodiments, the contact surface between the upper piston body and the lower piston body is a planar structure that increases the contact area.

[0010] In some embodiments, the upper piston body and the lower piston body are cast using a common casting mold.

[0011] In some embodiments, the reinforcing ribs are evenly distributed around the bisecting surfaces of the upper and lower piston bodies to control the consistency of radial thermal deformation.

[0012] In some embodiments, the sand-clearing hole is located in a non-stressed area of ​​the piston body, and no plug is required after sand clearing.

[0013] In some embodiments, the end wall thickness of the upper and lower piston bodies can be re-measured after machining to ensure the strength of the piston bodies.

[0014] In some embodiments, the piston body surface is further provided with a support ring and a piston ring to improve sealing and operational stability.

[0015] The beneficial effects that the large-diameter split cast aluminum piston structure disclosed in this application may bring include, but are not limited to:

[0016] Lightweight and high strength: Cast aluminum material reduces weight, and the split structure combined with reinforcing ribs improves overall rigidity and resistance to deformation.

[0017] Simplified process: The sand-cleaning holes are directly cast and formed, and there is no need to plug them after sand cleaning, which reduces process complexity and safety hazards.

[0018] Thermal deformation control: The reinforcing ribs are evenly distributed to effectively coordinate the thermal expansion differences between the upper and lower piston bodies and avoid seal failure.

[0019] Improved reliability: Increased connection contact area and hydraulic pre-tightening technology ensure a firm connection between the piston body and piston rod, extending the life of the support ring. Attached Figure Description

[0020] Figure 1 A schematic diagram of the large-diameter split cast aluminum piston assembly provided by this utility model;

[0021] Figure 2 The upper piston body provided by this utility model;

[0022] Figure 3 The lower piston body provided by this utility model.

[0023] The labels in the diagram are as follows: 1-Piston locking nut, 2-Locking nut washer, 3-Upper piston body, 4-Support ring, 5-Piston ring, 6-Piston rod washer, 7-Lower piston body, 8-Piston rod. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0025] Conversely, this application covers any substitutions, modifications, equivalent methods, and schemes made within the spirit and scope of this application as defined in the claims. Furthermore, to provide the public with a better understanding of this application, certain specific details are described in detail below. However, this application can be fully understood by those skilled in the art even without these detailed descriptions.

[0026] like Figure 1-3 As shown, a large-diameter split cast aluminum piston structure includes a piston rod 8, an upper piston body 3, a lower piston body 7, a locking nut washer 2, a piston rod washer 6, and a piston locking nut 1. The piston rod 8 passes sequentially through the piston rod washer 6, the lower piston body 7, the upper piston body 3, and the locking nut washer 2, and is fastened together by the piston locking nut 1; the upper piston body 3 and the lower piston body 7 are pre-tightened and fixed to the piston rod 8 by a hydraulic tensioner. Specific features include:

[0027] Split design: The piston body is divided into an upper piston body 3 and a lower piston body 7. The split surface of the two is equipped with reinforcing ribs and has reserved sand cleaning holes.

[0028] Reinforcing rib arrangement: The reinforcing ribs are evenly distributed circumferentially along the split surface to control the consistency of radial deformation of the upper and lower piston bodies 7 when heated.

[0029] Sand removal hole optimization: The sand removal hole is located in the non-stress area of ​​the piston body. After sand removal, there is no need to install a plug, avoiding the risk of plug loosening.

[0030] Connection surface design: The connection contact surfaces of the upper and lower piston bodies 7 are planar structures with increased area to improve connection stability.

[0031] Shared casting process: The upper and lower piston bodies 7 are cast using the same casting mold, which simplifies the process and ensures dimensional consistency.

[0032] End face wall thickness inspection: The end face wall thickness can be re-measured after the piston body is machined to ensure that the strength meets the design requirements.

[0033] In some embodiments, a support ring 4 and a piston ring 5 are also installed on the surface of the piston body to improve sealing and operational stability.

[0034] In some embodiments, the reinforcing ribs may employ a mesh or wave-like structure to adapt to different working conditions.

[0035] In some embodiments, the number and location of the sand-cleaning holes can be adjusted according to the casting process.

[0036] In some embodiments, the piston body material may be replaced with other high-strength aluminum alloys.

[0037] This invention satisfies the requirements of piston strength and rigidity while reducing piston weight, improving the lifespan of the support ring 4, and also reducing the inertial force during piston movement. The split cast aluminum piston has sand-removal holes for easy sand removal, eliminating the need for sand-removal plugs. The end face wall thickness can be re-measured after piston body machining to ensure piston body strength. During piston movement, it comes into contact with the high-temperature gas compressed by the cylinder, resulting in a higher thermal expansion of the piston body than the piston rod 8. Reinforcing ribs are added to control the radial deformation of the upper piston body 3 and lower piston body 7 to be consistent. The large-diameter split cast aluminum piston has a simple structure, good manufacturing process, and improves the reliability and service life of large-diameter pistons.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A large-diameter split cast aluminum piston structure, characterized in that, It includes a piston rod (8), an upper piston body (3), a piston rod washer (6), a lower piston body (7), a locking nut washer (2), and a piston locking nut (1); the piston rod (8) passes through the piston rod washer (6), the lower piston body (7), the upper piston body (3), and the locking nut washer (2) in sequence, and is fastened together by the piston locking nut (1); the upper piston body (3) and the lower piston body (7) are pre-tightened and fixed on the piston rod (8); the upper piston body (3) and the lower piston body (7) are provided with reinforcing ribs on their split surfaces, and sand cleaning holes are reserved on the piston body; The connection surface between the upper piston body (3) and the lower piston body (7) is a planar structure that increases the contact area; The upper piston body (3) and the lower piston body (7) are cast using a common casting mold; The reinforcing ribs are evenly distributed around the split surfaces of the upper piston body (3) and the lower piston body (7) to control the consistency of radial thermal deformation; the sand-clearing holes are located in the non-stressed areas of the piston body.

2. The large-diameter split cast aluminum piston structure according to claim 1, characterized in that, The end wall thickness of the upper piston body (3) and the lower piston body (7) can be re-measured after processing to ensure the strength of the piston body.

3. The large-diameter split cast aluminum piston structure according to claim 1, characterized in that, The piston body surface is also equipped with a support ring (4) and a piston ring (5) to improve sealing and operational stability.

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