A stepped piston rod

Abstract

This utility model relates to the field of piston rod technology and discloses a stepped piston rod, including a piston rod comprising a piston one, a support ring one, a piston ring one, a stud, a nut, a brake pad, a flange, a concave spherical pad one, a convex spherical pad one, an adjusting sleeve, a concave spherical pad two, a convex spherical pad two, a support ring two, a piston ring two, a key one, a piston two, a piston three, and a key two. In this utility model, by setting concave spherical pad two and convex spherical pad two, etc., spherical mating structures inside the stepped piston connection, the clearance can be automatically compensated when the support ring or cylinder wears, effectively preventing the piston rod from bearing excessive bending stress and premature fatigue fracture. Simultaneously, the grinding of spherical components, the application of lubricating grease, and the precise control of the end face clearance of piston one during assembly enable piston one to have reliable automatic adjustment and flexible movement performance. The flanged riveting design of the brake pad and piston two also enhances the structural anti-loosening capability.

Description

Technical Field

[0001] This utility model relates to the field of piston rod technology, and in particular to a stepped piston rod. Background Technology

[0002] As is well known, differential piston structures are widely used in the field of fluid machinery such as compressors. They achieve the compression process of media at different pressure levels through the differential coordination of multiple sets of pistons. Traditional differential piston rods usually adopt a rigid flange positioning connection structure.

[0003] However, this rigid connection method has significant shortcomings in actual operation: when the support ring wears, or the cylinder wears due to long-term use, the rigid connection lacks self-compensation capability, which can lead to excessive bending stress on the piston rod. Under long-term stress, the piston rod is prone to premature fatigue fracture, which not only affects the normal operation of the equipment and increases maintenance costs and downtime, but also significantly reduces the overall reliability and economy of the equipment.

[0004] Therefore, those skilled in the art have provided a stepped piston rod to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a stepped piston rod. When in use, this piston rod utilizes a spherical mating structure, including a second concave spherical pad and a second convex spherical pad, within the stepped piston connection. This automatically compensates for gaps when the support ring or cylinder wears, effectively preventing premature fatigue fracture due to excessive bending stress on the piston rod. Simultaneously, the grinding of the spherical components, the application of lubricating grease, and the precise control of the end face gap of the piston during assembly ensure reliable automatic adjustment and flexible movement performance of the piston. The flanged and riveted design of the brake pad and the piston further enhances the structure's anti-loosening capability, ultimately significantly improving the reliability, service life, and economy of the equipment.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A stepped piston rod includes a piston rod comprising a piston, a support ring, a piston ring, a stud, a nut, a brake pad, a flange, a concave spherical pad, a convex spherical pad, an adjusting sleeve, a concave spherical pad, a convex spherical pad, a support ring, a piston ring, a key, a piston, a piston, and a key. The concave spherical pad and the convex spherical pad are disposed inside the connection between the piston and the piston rod.

[0007] Compared with existing piston rods, this new piston rod, through the above technical solution, uses a spherical mating structure such as a concave spherical pad II and a convex spherical pad II inside the stepped piston connection. This structure can automatically compensate for the clearance when the support ring or cylinder wears, effectively preventing the piston rod from bearing excessive bending stress and premature fatigue fracture. At the same time, the grinding of spherical components, the application of lubricating grease, and the precise control of the clearance at the end face of piston one during assembly enable piston one to have reliable automatic adjustment and flexible movement performance. The flanged riveting design of the brake pad and piston two also enhances the structural anti-loosening ability, ultimately significantly improving the reliability, service life, and economy of the equipment.

[0008] During assembly, the end face of piston one is ground and a gap of 0.05-0.08mm is reserved. This precise gap provides the necessary space for piston one to rotate and swing freely, avoiding jamming caused by too small a gap and preventing abnormal noise caused by too large a gap. At the same time, it provides a reasonable displacement margin for the automatic compensation function of the spherical pad, ensuring that piston one can flexibly respond to wear changes during equipment operation, and further enhancing the stress buffering effect of the piston rod. Furthermore, the stud and nut cooperate to securely connect the flange and brake pad components; The above technical solution uses studs and nuts to fasten flanges and brake pads, and the mechanical fastening effect of threaded connections achieves a reliable connection between components. This effectively resists vibration and impact loads generated during equipment operation, avoids the decrease in assembly accuracy caused by component loosening, provides a structural foundation for the stable performance of the brake pad's braking function, and facilitates disassembly and reassembly during later maintenance, improving maintenance convenience.

[0009] Furthermore, the concave spherical pad II and the convex spherical pad II are spherically fitted and automatically self-aligning; Through the above technical solution, the concave spherical pad II and the convex spherical pad II achieve automatic self-alignment by using spherical contact. The spherical contact form enables the two components to have multi-angle adaptive adjustment capability. When the support ring or cylinder experiences uneven wear, the center deviation of the piston assembly can be automatically corrected by relative sliding of the spherical surfaces, avoiding additional bending stress on the piston rod due to force offset. This eliminates the hidden danger of stress concentration from the structural design and significantly extends the fatigue life of the piston rod.

[0010] Furthermore, the adjusting sleeve is fitted onto the assembly clearance of the adjusting piston assembly; The above technical solution uses an adjusting sleeve to adjust the assembly clearance of the piston assembly. This allows for flexible adaptation to the assembly requirements and component machining errors of the piston assembly under different working conditions. It effectively compensates for the shortcomings of traditional rigid connections that cannot adjust the clearance, ensures the coordination of movement between pistons, avoids problems such as increased movement resistance due to overly tight assembly or decreased sealing performance due to overly loose assembly, and improves the assembly compatibility and operational stability of the product.

[0011] Furthermore, key one and key two are circumferentially positioned between the piston and the piston rod; The above technical solution achieves circumferential positioning between the piston and piston rod through key one and key two, which can accurately transmit torque, prevent relative rotation between the piston and piston rod during high-speed reciprocating motion, ensure the synchronicity and consistency of the movement of each piston, avoid problems such as accelerated piston ring wear and seal failure caused by circumferential movement, and at the same time ensure the pressure stability of the compression process and improve the working efficiency of the equipment.

[0012] Furthermore, the convex edges of the concave spherical pad one, convex spherical pad one, concave spherical pad two, convex spherical pad two, and piston one are coated with lubricating grease. Through the above technical solution, by applying lubricating grease to the concave spherical pad one, convex spherical pad one, concave spherical pad two, convex spherical pad two and piston one's convex edge, the grease forms a uniform oil film on the contact surface of the components, which can significantly reduce the friction coefficient of the spherical mating surface and the convex edge friction pair, reduce wear and loss during the movement process, and at the same time play a role in preventing rust and slowing down the aging rate of the components. In addition, it can also absorb some vibration energy, reduce operating noise, and improve the stability of equipment operation.

[0013] Furthermore, the spherical surfaces of the concave spherical pad one, convex spherical pad one, concave spherical pad two, and convex spherical pad two are ground during assembly; By employing the aforementioned technical solution, and through grinding and assembling the spherical surfaces of concave spherical pad one, convex spherical pad one, concave spherical pad two, and convex spherical pad two, the fitting accuracy of the spherical contact can be significantly improved. This results in a larger contact area and more uniform force distribution between the two spherical surfaces, avoiding localized stress concentration caused by poor contact. Simultaneously, it reduces resistance and jamming during relative movement of the spherical surfaces, ensuring the flexibility of piston one's free rotation and oscillation. This provides a high-precision structural guarantee for the reliable realization of the automatic adjustment function.

[0014] Furthermore, after the brake pad and piston are assembled, they are flanged and riveted. The above technical solution involves using a flanged riveting method after the brake pad and piston are assembled. This anti-loosening structure is a permanent fastening method. Compared with traditional threaded anti-loosening methods, it can more thoroughly resist the risk of loosening caused by vibration, impact and temperature changes during long-term operation of the equipment, ensuring the continuous stability of the brake pad's braking function and the fixation of the piston's assembly position, reducing the probability of failure caused by component loosening and lowering equipment maintenance costs.

[0015] This utility model has the following beneficial effects: 1. This utility model proposes a stepped piston rod, which, compared with existing piston rods, features a spherical mating structure such as a concave spherical pad II and a convex spherical pad II inside the stepped piston connection. This structure automatically compensates for the clearance when the support ring or cylinder wears, effectively preventing the piston rod from bearing excessive bending stress and premature fatigue fracture. At the same time, the grinding of the spherical components, the application of lubricating grease, and the precise control of the clearance at the end face of piston one during assembly enable piston one to have reliable automatic adjustment and flexible movement performance. The flanged riveting design of the brake pad and piston two also enhances the structural anti-loosening ability, ultimately significantly improving the reliability, service life, and economy of the equipment. Attached Figure Description

[0016] Figure 1 This is a front view of a stepped piston rod proposed in this utility model.

[0017] Explanation of reference numerals in the attached figures: 1. Piston 1; 2. Support ring 1; 3. Piston ring 1; 4. Stud; 5. Nut; 6. Brake pad; 7. Flange; 8. Concave spherical pad 1; 9. Convex spherical pad 1; 10. Adjusting sleeve; 11. Concave spherical pad 2; 12. Convex spherical pad 2; 13. Support ring 2; 14. Piston ring 2; 15. Piston rod; 16. Key 1; 17. Piston 2; 18. Piston 3; 19. Key 2. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments. Obviously, the described specific embodiments are only a part of the specific embodiments of the present invention, and not all of them. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Reference Figure 1 The present invention provides an embodiment of a differential piston rod, comprising a piston rod 15, wherein the piston rod 15 comprises a piston 1, a support ring 2, a piston ring 3, a stud 4, a nut 5, a brake pad 6, a flange 7, a concave spherical pad 8, a convex spherical pad 9, an adjusting sleeve 10, a concave spherical pad 2 11, a convex spherical pad 2 12, a support ring 2 13, a piston ring 2 14, a key 16, a piston 2 17, a piston 3 18, and a key 2 19. The concave spherical pad 2 11 and the convex spherical pad 2 12 are disposed inside the connection between the piston 1 and the piston rod 15.

[0020] Compared to existing piston rods, this piston rod, when in use, utilizes spherical mating structures such as concave spherical pad 11 and convex spherical pad 12 inside the stepped piston connection. This allows for automatic compensation of clearances when the support ring or cylinder wears, effectively preventing the piston rod 15 from prematurely fatigued due to excessive bending stress. Simultaneously, the grinding of spherical components, the application of lubricating grease, and the precise control of the clearance at the piston one end face during assembly enable the piston one to possess reliable automatic adjustment and flexible movement performance. The flanged riveting design of the brake pad 6 and piston two 17 also enhances the structural anti-loosening capability, ultimately significantly improving the reliability, service life, and economy of the equipment.

[0021] During assembly, the end face of piston 1 is ground and a gap of 0.05-0.08mm is reserved. This precise gap provides the necessary space for the free rotation and oscillation of piston 1, avoiding jamming caused by too small a gap and preventing abnormal noise caused by excessive gap. At the same time, it provides a reasonable displacement margin for the automatic compensation function of the spherical pad, ensuring that piston 1 can flexibly respond to wear changes during equipment operation, and further enhancing the stress buffering effect of piston rod 15. The stud 4 and nut 5 work together to securely connect the flange 7 and brake pad 6 components; The flange 7 and brake pad 6 are fastened by the stud 4 and nut 5. The mechanical fastening effect of the threaded connection realizes the reliable connection between the components, which can effectively resist the vibration and impact load generated during equipment operation, avoid the decrease in assembly accuracy caused by component loosening, provide a structural basis for the stable performance of the braking function of brake pad 6, and facilitate disassembly and reassembly during later maintenance, thus improving maintenance convenience.

[0022] The concave spherical pad 211 and the convex spherical pad 22 are spherically fitted and automatically self-aligning. Automatic self-alignment is achieved by using a spherical fit between concave spherical pad 11 and convex spherical pad 12. The spherical contact allows the two components to have multi-angle adaptive adjustment capabilities. When uneven wear occurs in the support ring or cylinder, the center deviation of the piston assembly can be automatically corrected by relative sliding of the spherical surfaces, avoiding additional bending stress on the piston rod 15 due to force offset. This eliminates the hidden danger of stress concentration from the structural design and significantly extends the fatigue life of the piston rod 15.

[0023] Adjusting sleeve 10 is used to adjust the assembly clearance of the piston assembly; The adjustment sleeve 10 is used to adjust the assembly clearance of the piston assembly. It can be flexibly adapted to the assembly requirements of the piston assembly and the machining error of the parts under different working conditions. It effectively makes up for the defect that the traditional rigid connection cannot adjust the clearance, ensures the coordination of movement between pistons, avoids problems such as increased movement resistance caused by excessive tightness or decreased sealing performance caused by excessive looseness, and improves the assembly compatibility and operation stability of the product.

[0024] Key 16 and Key 29 are circumferentially positioned between the piston and piston rod 15; By using key 16 and key 29 to achieve circumferential positioning between the piston and piston rod 15, torque can be accurately transmitted, preventing relative rotation between the piston and piston rod 15 during high-speed reciprocating motion, ensuring the synchronization and consistency of the movement of each piston, avoiding problems such as increased piston ring wear and seal failure caused by circumferential movement, and ensuring the pressure stability of the compression process, thereby improving the working efficiency of the equipment.

[0025] The concave spherical pad 18, the convex spherical pad 19, the concave spherical pad 21, the convex spherical pad 212, and the convex edge of the piston 1 are coated with lubricating grease. By applying lubricating grease to the concave spherical pad 8, convex spherical pad 9, concave spherical pad 11, convex spherical pad 12, and the convex edge of piston 1, the grease forms a uniform oil film on the contact surface of the components. This can significantly reduce the coefficient of friction of the spherical mating surface and the convex edge friction pair, reduce wear and loss during operation, prevent rust, slow down the aging of components, absorb some vibration energy, reduce operating noise, and improve the stability of equipment operation.

[0026] The spherical surfaces of concave spherical pad 18, convex spherical pad 19, concave spherical pad 21, and convex spherical pad 22 are ground during assembly. By grinding and assembling the spherical surfaces of concave spherical pad 18, convex spherical pad 19, concave spherical pad 21, and convex spherical pad 22, the fitting accuracy of the spherical contact can be significantly improved, resulting in a larger contact area and more uniform force distribution between the two spherical surfaces. This avoids localized stress concentration caused by poor contact, while also reducing resistance and jamming during relative movement of the spherical surfaces. This ensures the flexibility of piston 1's free rotation and oscillation, providing a high-precision structural guarantee for the reliable realization of the automatic adjustment function.

[0027] Brake pad 6 and piston 2 17 are assembled and then riveted together. After the brake pad 6 and piston 17 are assembled, they are riveted with flanges. This anti-loosening structure is a permanent fastening method. Compared with traditional threaded anti-loosening methods, it can more thoroughly resist the risk of loosening caused by vibration, impact and temperature changes during long-term operation of the equipment. It ensures the continuous stability of the braking function of the brake pad 6 and the fixation of the assembly position of piston 17, reduces the probability of failure caused by loose parts and lowers the equipment maintenance cost.

[0028] Working principle: During the assembly stage, the end face of piston 1 is first ground to leave a clearance of 0.05-0.08mm. Then, flange 7 and brake pad 6 are fastened together by stud 4 and nut 5. The brake pad 6 and piston 17 are then riveted to enhance the anti-loosening effect. At the same time, lubricating grease is applied to concave spherical pad 8, convex spherical pad 9, concave spherical pad 11, convex spherical pad 12 and the convex edge of piston 1. The spherical surfaces of each pad are ground to ensure fitting accuracy. The circumferential positioning of piston and piston rod 15 is completed with the help of key 16 and key 19. The assembly clearance of piston assembly is adapted by adjusting sleeve 10. When the equipment is running, piston 1, piston 2 17, and piston 3 18, driven by piston rod 15, compress the medium through the cooperation of piston ring 1 3, piston ring 2 14, support ring 1 2, and support ring 2 13. When the support ring or cylinder wears, the concave spherical pad 2 11 and convex spherical pad 2 12 inside the connection between piston 1 and piston rod 15 automatically align themselves to compensate for the gap caused by wear, and prevent piston rod 15 from bearing excessive bending stress. The key structure ensures that the piston and piston rod 15 move synchronously, and the lubrication and grinding treatment ensures that each component operates flexibly and stably, ultimately achieving efficient and reliable compression operation.

[0029] The following points should be noted in this article: 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0030] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing specific embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., 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 stepped piston rod, comprising a piston rod (15), characterized in that: The piston rod (15) includes piston one (1), support ring one (2), piston ring one (3), stud (4), nut (5), brake pad (6), flange (7), concave spherical pad one (8), convex spherical pad one (9), adjusting sleeve (10), concave spherical pad two (11), convex spherical pad two (12), support ring two (13), piston ring two (14), key one (16), piston two (17), piston three (18), and key two (19). The concave spherical pad two (11) and convex spherical pad two (12) are provided inside the connection between piston one (1) and piston rod (15).

2. The stepped piston rod according to claim 1, characterized in that: The stud (4) and nut (5) work together to fasten the flange (7) and brake pad (6) components together.

3. A stepped piston rod according to claim 1, characterized in that: The concave spherical pad 2 (11) and the convex spherical pad 2 (12) are spherically fitted and automatically self-aligning.

4. A stepped piston rod according to claim 1, characterized in that: The adjusting sleeve (10) is used to adjust the assembly clearance of the piston assembly.

5. A stepped piston rod according to claim 1, characterized in that: Key 1 (16) and Key 2 (19) are circumferentially positioned between the piston and the piston rod.

6. A stepped piston rod according to claim 1, characterized in that: The raised edges of the concave spherical pad one (8), convex spherical pad one (9), concave spherical pad two (11), convex spherical pad two (12) and piston one (1) are coated with lubricating grease.

7. A stepped piston rod according to claim 1, characterized in that: The spherical surfaces of the concave spherical pad one (8), convex spherical pad one (9), concave spherical pad two (11), and convex spherical pad two (12) are ground during assembly.

8. A stepped piston rod according to claim 1, characterized in that: After the brake pad (6) and piston two (17) are assembled, they are flanged and riveted.

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