Split type interference assembly oil cylinder piston structure of hydrogen compressor

Abstract

The utility model provides a split type interference assembly oil cylinder piston structure of a hydrogen compressor, and belongs to the technical field of hydrogen compressor hydraulic oil cylinders. The problems that in an existing oil cylinder piston, a piston rod and a piston are assembled in the mode that a clamping key is matched with a screw, in the operation process of the oil cylinder piston, the screw is broken, the inner surface of an oil cylinder is scratched, and leakage or equipment damage is caused are solved. The piston comprises a piston rod and two split pistons, the piston rod is symmetrically sleeved with the two split pistons at intervals, a large space ring is arranged in a gap between the two split pistons, the large space ring is in interference fit with the gap between the two split pistons, small space rings are arranged at one ends of the two split pistons, and the small space rings are in interference fit with the gap between the two split pistons. One end of the split type piston abuts against the small space ring and forms limiting fit with the small space ring, and the large space ring and the small space ring are each of a split structure and are arranged on the piston rod in a sleeving mode. The tool is mainly used for assembling and fixing the oil cylinder piston in the hydrogen compressor.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hydrogen compressor hydraulic oil cylinder technical field, especially relates to a hydrogen compressor split type interference assembly oil cylinder piston structure. BACKGROUND

[0002] As the key equipment in the hydrogen energy industry chain, the reliability of the oil cylinder piston structure of the hydrogen compressor directly affects the operation efficiency and service life of the equipment. The traditional oil cylinder piston adopts a combined structure of an integral piston rod and a piston, which is assembled and fixed by a key and screw. Although this structure meets the basic assembly requirements to some extent, it has significant technical defects in actual application.

[0003] Firstly, the screw connection method is prone to fatigue fracture under dynamic conditions due to alternating loads. During the operation of the hydrogen compressor, the oil cylinder piston needs to withstand high-frequency reciprocating motion and high-pressure hydrogen gas. As a dynamic connecting piece, the screw is in a state of stress concentration for a long time, and fatigue cracks are easily formed at the root of the screw thread, which eventually leads to fracture failure. The broken screw fragments may scratch the inner wall of the oil cylinder during the movement of the piston, causing leakage or equipment damage, which seriously threatens the operation safety.

[0004] Secondly, the screw assembly has high requirements for processing precision and assembly process. The piston needs to be axially positioned by multiple screws, which not only increases the assembly complexity, but also requires regular maintenance and inspection, significantly increasing the equipment operation and maintenance cost. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model aims to provide a hydrogen compressor split type interference assembly oil cylinder piston structure to solve the problem that the piston rod and the piston in the existing oil cylinder piston are assembled by a key and screw, and the screw fracture during the operation of the oil cylinder piston causes scratches on the inner surface of the oil cylinder, thereby causing leakage or equipment damage.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a hydrogen compressor split type interference assembly oil cylinder piston structure, which comprises a piston rod and two split type pistons. The two split type pistons are symmetrically and spacedly sleeved on the piston rod. A large spacer ring is arranged in the gap between the two split type pistons. The large spacer ring is interference-fitted with the gap of the two split type pistons. One end of each of the two split type pistons is provided with a small spacer ring. One end of the split type piston abuts against the small spacer ring and forms a limiting fit. The large spacer ring and the small spacer ring are both split structure and are sleeved on the piston rod.

[0007] Furthermore, a clamping groove matched with the small spacer ring is formed on the piston rod. The small spacer ring is clamped on the clamping groove. The width of the clamping groove is greater than the width of the small spacer ring.

[0008] Further, one end of the split piston is provided with a recess matched with the small spacer, and the small spacer is abutted in the recess.

[0009] Further, an O-shaped sealing ring is arranged between the inner hole of the split piston and the piston rod, a first sealing groove is arranged on the piston rod and matched with the O-shaped sealing ring, and the O-shaped sealing ring is sleeved in the first sealing groove.

[0010] Further, a stop ring is arranged in the second clamping groove and arranged on one side of the O-shaped sealing ring.

[0011] Further, the piston rod is arranged in the oil cylinder barrel in an axial sliding mode, and the outer circle of the split piston is in contact with and slidingly matched with the inner wall of the split piston.

[0012] Further, a second sealing groove is arranged on one side of the outer circle of the split piston, and a U-shaped sealing ring is sleeved in the second sealing groove.

[0013] Further, oil cylinder end covers are arranged at two ends of the oil cylinder barrel, and two ends of the piston rod are slidingly arranged through the two oil cylinder end covers.

[0014] Further, the oil cylinder end cover and the oil cylinder barrel are connected through a flange.

[0015] Further, a support ring is arranged between the outer circle of the large spacer and the inner wall of the oil cylinder barrel.

[0016] Compared with the prior art, the hydrogen compressor split type interference assembly oil cylinder piston structure has the following beneficial effects:

[0017] 1. The hydrogen compressor split type interference assembly oil cylinder piston structure adopts two split pistons arranged in a symmetrical mode, and realizes axial positioning of the piston through the cooperation of the large spacer arranged in the gap between the two split pistons and the small spacer arranged at one end of the two split pistons, so that the piston does not need to be positioned through a screw structure, the risk of scratching the inner surface of the oil cylinder caused by screw breakage in the running process of the oil cylinder piston is prevented, and the safety of equipment running is improved.

[0018] 2. The hydrogen compressor split type interference assembly oil cylinder piston structure adopts a split structure for the large spacer and the small spacer, and has low assembly complexity compared with a screw structure. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present application, and the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0020] Fig. 1 A schematic view of a split type interference assembly oil cylinder piston structure of a hydrogen compressor according to the utility model;

[0021] Fig. 2 An enlarged schematic view of part of the structure of the split type interference assembly oil cylinder piston structure of the hydrogen compressor according to the utility model.

[0022] 1-piston rod, 2-split type piston, 3-large spacer ring, 4-small spacer ring, 5-O-shaped sealing ring, 6-retaining ring, 7-oil cylinder barrel, 8-U-shaped sealing ring, 9-oil cylinder end cover, 10-flange, 11-support ring. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0024] Reference is made to Figs. 1-2 In order to illustrate the present embodiment, a split type interference assembly oil cylinder piston structure of a hydrogen compressor comprises a piston rod 1 and two split type pistons 2, the two split type pistons 2 are symmetrically and spacedly sleeved on the piston rod 1, a large spacer ring 3 is arranged in the gap between the two split type pistons 2, the large spacer ring 3 is interference-fitted with the gap of the two split type pistons 2, one end of each of the two split type pistons 2 is provided with a small spacer ring 4, one end of the split type piston 2 abuts against the small spacer ring 4 and forms a limiting fit, the large spacer ring 3 and the small spacer ring 4 are both split structure and are sleeved on the piston rod 1, the large spacer ring and the small spacer ring are both split structure, compared with a screw structure, the assembly complexity of the present structure is low, both split structure is adopted, compared with a screw structure, the assembly complexity of the present structure is low, two split type pistons 2 are symmetrically arranged, and through the cooperation of the large spacer ring 3 arranged in the gap between the two split type pistons 2 and the small spacer ring 4 arranged at one end of the two split type pistons 2, axial positioning of the piston is realized, the piston does not need to be positioned by a screw structure, the risk that the oil cylinder inner surface is scratched due to screw fracture during operation of the oil cylinder piston can be prevented, and the safety of equipment operation is improved.

[0025] The interference amount of the large spacer ring 3 in the present embodiment needs to be accurately calculated, if the interference amount is not enough, the two split type pistons 2 may move in the middle during long time operation, if the interference amount is too large, installation cannot be performed, and the interference amount needs to ensure that the two split type pistons 2 always maintain axial positioning.

[0026] The piston rod 1 is provided with a clamping groove matched with the small spacer 4, and the small spacer 4 is clamped in the clamping groove. In the embodiment, the coaxiality of the clamping groove is the same as that of the whole piston rod 1.

[0027] The width of the clamping groove is greater than that of the small spacer 4. In the embodiment, the small spacer 4 has a two-part structure, and the outer circle and inner circle dimensions of the two parts after being combined meet the size requirements of a whole circle. In addition, the width of the small spacer 4 is smaller than the width of the clamping groove of the piston rod 1, facilitating the assembly between the small spacer 4 and the clamping groove. The small spacer 4 limits the axial movement of the split piston 2, and thus the tensile and yield strength of the small spacer 4 meets the force requirement of the piston in the axial direction.

[0028] In the embodiment, the large spacer 3 has a two-part structure, and the outer circle and inner circle dimensions of the two parts after being combined meet the size requirements of a whole circle. In addition, the width of the large spacer is greater than the width of the gap between the two split pistons 2, but the size needs to be accurately calculated to ensure that the large spacer is assembled with the piston in interference, and the interference amount needs to be ensured to prevent the piston from moving during long-term operation.

[0029] In the embodiment, one end of the split piston 2 is provided with a recess matched with the small spacer 4, and the small spacer 4 is abutted in the recess to limit the axial movement of the split piston 2.

[0030] In the embodiment, an O-shaped sealing ring 5 is arranged between the inner hole of the split piston 2 and the piston rod 1. The piston rod 1 is provided with a first sealing groove matched with the O-shaped sealing ring 5. The O-shaped sealing ring 5 is embedded in the first sealing groove. The O-shaped sealing ring 5 is used to ensure the sealing between the inner hole of the split piston 2 and the outer circle of the piston rod 1.

[0031] In the embodiment, a check ring 6 is arranged in the second clamping groove. The check ring 6 is arranged on one side of the O-shaped sealing ring 5. The check ring 6 protects the O-shaped sealing ring 5 from moving into the gap between the inner hole of the split piston 2 and the outer circle of the piston rod 1 during operation.

[0032] In the embodiment, the piston rod 1 is arranged in the oil cylinder barrel 7 in the axial direction. The outer circle of the split piston 2 is in contact with and slidingly matched with the inner wall of the oil cylinder barrel 7.

[0033] In the embodiment, a second sealing groove is formed on one side of the outer circle of the split piston 2. A U-shaped sealing ring 8 is embedded in the second sealing groove. The U-shaped sealing ring 8 is used to ensure the sealing between the outer circle of the split piston 2 and the inner wall of the oil cylinder barrel 7.

[0034] In the embodiment, the oil cylinder barrel 7 is provided with an oil cylinder end cover 9 at both ends. The both ends of the piston rod 1 respectively slidingly pass through the two oil cylinder end covers 9.

[0035] The oil cylinder end cover 9 and the oil cylinder barrel 7 are connected through the flange 10 in the embodiment, and the flange 10 is used for connecting and fixing the oil cylinder end cover 9 and the oil cylinder barrel 7.

[0036] The support ring 11 is arranged between the outer circle of the large partition ring 3 and the inner wall of the oil cylinder barrel 7, and the support ring 11 plays a supporting and guiding role on the split piston 2.

[0037] In the embodiment, the small partition ring 4 on one side is first installed in the clamping groove on one side of the piston rod 1, then one split piston 2 is assembled on the piston rod 1 from the other end of the piston rod 1, and the recess on one end of the split piston 2 is butted against the small partition ring 4, after the butt joint, the other split piston 2 is also assembled on the piston rod 1 from the other end of the piston rod 1, and the small partition ring 4 on the other side is installed in the clamping groove on the other side of the piston rod 1, and the recess on one end of the split piston 2 on the other side is butted against the small partition ring 4, at this time, the two split pistons 2 are respectively butt-jointed with the small partition rings 4 on the two sides, at this time, there is a gap between the two split pistons 2, and then a two-lip structure large partition ring 3 is interference-fitted between the two split pistons 2, so that the axial positions of the two split pistons 2 are limited. Such a structure can position the flange through the partition ring and the clamping groove, without the screw structure, and can prevent the risk of oil cylinder inner surface scratching caused by screw breakage during operation of the oil cylinder piston.

[0038] The above disclosed embodiments of the utility model are only used for helping to describe the utility model. The embodiments do not describe all the details, and the utility model is not limited to the specific implementation mode. According to the content of the specification, many modifications and changes can be made. The embodiments are selected and specifically described in the specification, in order to better explain the principle and practical application of the utility model, so that the person skilled in the art can well understand and utilize the utility model.

Claims

1. A split interference fit cylinder piston structure for a hydrogen compressor, characterized by: It includes a piston rod (1) and two split pistons (2), the two split pistons (2) are symmetrically and spacedly sleeved on the piston rod (1), a large spacer ring (3) is arranged in the gap between the two split pistons (2), the large spacer ring (3) is in interference fit with the gap of the two split pistons (2), one end of the two split pistons (2) is provided with a small spacer ring (4), one end of the split piston (2) abuts against the small spacer ring (4) and forms a limiting fit, the large spacer ring (3) and the small spacer ring (4) are both split structure and are sleeved on the piston rod (1).

2. The split interference fit oil cylinder piston structure of claim 1, wherein: The piston rod (1) is provided with a clamping groove matched with the small spacer ring (4), the small spacer ring (4) is clamped on the clamping groove, and the width of the clamping groove is greater than the width of the small spacer ring (4).

3. The split interference fit oil cylinder piston structure of claim 1, wherein: One end of the split piston (2) is provided with a recess matched with the small spacer ring (4), and the small spacer ring (4) abuts in the recess.

4. The split interference fit oil cylinder piston structure of claim 1, wherein: An O-shaped sealing ring (5) is arranged between the inner hole of the split piston (2) and the piston rod (1), a first sealing groove matched with the O-shaped sealing ring (5) is formed in the piston rod (1), and the O-shaped sealing ring (5) is embedded in the first sealing groove.

5. The split interference fit oil cylinder piston structure of claim 4, wherein: A retaining ring (6) is arranged in the first sealing groove, and the retaining ring (6) is arranged on one side of the O-shaped sealing ring (5).

6. A split interference fit oil cylinder piston structure for a hydrogen compressor according to claim 1, wherein: The piston rod (1) is arranged in the oil cylinder barrel (7) in an axial sliding mode, and the outer circle of the split piston (2) is in contact and sliding fit with the inner wall of the oil cylinder barrel (7).

7. The split interference fit oil cylinder piston structure of claim 6, wherein: A second sealing groove is formed in one side of the outer circle of the split piston (2), and a U-shaped sealing ring (8) is embedded in the second sealing groove.

8. A split interference fit oil cylinder piston structure for a hydrogen compressor according to claim 6, wherein: Oil cylinder end covers (9) are arranged at both ends of the oil cylinder barrel (7), and both ends of the piston rod (1) respectively slide through the two oil cylinder end covers (9).

9. The split interference fit oil cylinder piston structure of claim 8, wherein: The oil cylinder end cover (9) and the oil cylinder barrel (7) are connected through a flange (10).

10. The split interference fit oil cylinder piston structure of claim 6, wherein: A support ring (11) is arranged between the outer circle of the large spacer ring (3) and the inner wall of the oil cylinder barrel (7).

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