Hydraulically driven hydrogen compressor gas piston assembly

Abstract

The utility model discloses a kind of gas piston assemblies of hydraulic drive type hydrogen compressor, including gas piston body, piston rod, first camber structure is set to gas piston body at hole slot, second camber structure is set to the end of piston rod, contact by second camber structure and first camber structure, reduce the loss generated by piston rod frequently and gas piston impact, wear less, improve gas piston assembly life, can solve the problem that concave appears on the contact surface of gas piston and piston rod, deformation appears on the other side end cover surface of gas piston, gas piston body and piston rod structure are relatively simple, are easy to process, easy to assemble structure, cost is easy to reasonable, convenient maintenance, reduce production maintenance cost;By setting pad and ball structure, reduce impact, wear and shock absorption, reduce noise, the end of piston rod is tapered in circumferential direction and gap cooperation between gas piston body, prevent piston rod axial frequent movement, further improve the convenience of installation and removal, reduce contact wear.

Description

Technical Field

[0001] This utility model relates to the technical field of hydrogen compressor structure. More specifically, this utility model relates to a gas piston assembly for a hydraulically driven hydrogen compressor. Background Technology

[0002] Hydrogen compressors are crucial in the hydrogen energy industry chain, with applications spanning multiple areas. For example, hydrogen refueling stations for hydrogen fuel cell vehicles require compressors to pressurize and store hydrogen; energy storage, especially in the renewable energy sector, requires compression and storage after hydrogen production via water electrolysis; and the chemical industry handles hydrogen in processes such as ammonia synthesis or oil refining. Currently, the mainstream hydrogen compressor models include three major technical routes: reciprocating, diaphragm, and ion-liquid, with energy efficiency ratios generally reaching 75%-82%. Reciprocating and diaphragm types are currently the most prevalent. The piston assembly in a reciprocating liquid-driven compressor is a key component ensuring the compressor's normal and stable operation, requiring low leakage rates, simple maintenance, frequent start-stop cycles, and long-term operation. Currently, to improve the durability and performance of the piston assembly, improvements are mainly made to the piston body structure, with a focus on the number and placement of sealing rings. However, in actual operation, the reciprocating motion of the piston rod still causes concave surfaces at the contact surface between the piston and piston rod, and deformation of the end cap surface on the other side of the piston. Existing piston structures lack effective structural designs to prevent this problem. Therefore, while ensuring ease of disassembly, assembly, and maintenance, it is crucial to develop high-performance gas piston assemblies. Summary of the Invention

[0003] The purpose of this invention is to provide a gas piston assembly for a hydraulically driven hydrogen compressor, in order to solve the technical problem that the structure of the gas piston assembly in the prior art is prone to wear and deformation of the contact surface between the gas piston and the piston rod.

[0004] To achieve these objectives and other advantages according to this utility model, a gas piston assembly for a hydraulically driven hydrogen compressor is provided, including a gas piston body and a piston rod. A sealing assembly is axially spaced around the outer ring of the gas piston body to achieve a seal between the gas piston body and the cylinder liner. A groove is formed at one axial end of the gas piston body, and the head of the piston rod extends into the groove. The gas piston body, the groove, and the piston rod are coaxially arranged. A first arcuate surface structure is provided at the bottom of the groove, recessed axially. A second arcuate surface structure is provided on the end face of the piston rod facing the first arcuate surface structure. The dimensions of the first arcuate surface structure radially cover the second arcuate surface structure, and the second arcuate surface structure is used to contact the first arcuate surface structure during the reciprocating motion of the piston rod.

[0005] Preferably, the head of the piston rod is tapered and the circumferential side is fitted with the slot with clearance.

[0006] Preferably, a pad structure is assembled at the bottom of the slot, and positioning holes are spaced apart on the circumferential side of the pad. A fixing hole is provided through the piston body at the position corresponding to the positioning hole of the pad. The piston body and the pad are fixed together by screwing bolts into the corresponding fixing hole and positioning hole. A plug is welded to the outside of the fixing hole to seal it. The side of the pad facing the piston rod is set as the first arc surface structure. Multiple first grooves are provided circumferentially at intervals on the side of the pad facing the bottom of the slot. A second groove is provided at the bottom of the slot corresponding to the first groove. Steel balls are installed inside the first groove and the second groove. The piston body and the pad are in contact through the steel balls.

[0007] Preferably, the pad has a central hole extending through its central axis, and the pad has a stepped structure on the outer periphery of the bottom end near the hole.

[0008] Preferably, the sealing assembly includes sealing rings spaced apart along the axial direction and multiple sealing rings. The sealing rings are disposed on the outer ring of the piston body at the end away from the piston rod and are limited by a retaining ring set coaxially.

[0009] Preferably, the sealing ring has three layers.

[0010] Preferably, the outer end of the slot is provided with an outwardly expanding inclined surface structure.

[0011] This utility model has at least the following beneficial effects: This utility model discloses a gas piston assembly for a hydraulically driven hydrogen compressor, comprising a gas piston body and a piston rod that are fitted together. The gas piston body has a first arc-shaped structure at a groove, and the piston rod has a second arc-shaped structure at its end. When the piston rod reciprocates axially and comes into contact with the gas piston body, the second arc-shaped structure contacts the first arc-shaped structure, reducing wear caused by frequent impacts between the piston rod and the gas piston. This minimizes wear and extends the lifespan of the gas piston assembly. It solves the problems of concave surfaces at the contact surfaces of the gas piston and piston rod, and deformation of the end cap surface on the other side of the gas piston. The gas piston body and piston rod have relatively simple structures, both being easy to process and assemble, with reasonable costs, convenient maintenance, and reduced production and maintenance costs. By placing a pad and steel ball structure between the piston rod and the gas piston body, further impact reduction, wear resistance, vibration damping, and noise reduction are achieved. By using a tapered end of the piston rod along the circumferential direction and a clearance fit with the gas piston body, frequent axial movement of the piston rod is prevented, further improving ease of installation and disassembly and reducing contact wear.

[0012] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0013] Figure 1 This is the main view of the present invention. Figure 2 This is a front view structural diagram of one embodiment of the present utility model; Figure 3 This is a three-dimensional structural diagram of the pad block according to an embodiment of the present invention.

[0014] Explanation of reference numerals in the accompanying drawings: 1. Piston body, 2. Piston rod, 3. Sealing assembly, 4. Groove, 5. First arc surface structure, 6. Second arc surface structure, 7. Gasket, 8. Bolt, 9. Plug, 10. Steel ball, 11. Center hole, 12. Stepped structure, 13. Sealing ring, 14. Retaining ring, 15. Sealing ring, 16. Inclined surface structure. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0016] In the description of this utility model, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] like Figure 1 , Figure 2 As shown, the hydraulically driven hydrogen compressor piston assembly of this utility model includes a piston body 1 and a piston rod 2. The outer ring of the piston body 1 is axially spaced and fitted with sealing components 3 to achieve sealing between the piston body 1 and the cylinder liner. One end of the piston body 1 is provided with a groove 4 extending inward along the axial direction. The head of the piston rod 2 is used to extend into the groove 4. The piston body 1, the groove 4, and the piston rod 2 are coaxially arranged. The bottom of the groove 4 is provided with a first arc surface structure 5 that is recessed inward along the axial direction. The end face of the piston rod 2 facing the first arc surface structure 5 is provided with a second arc surface structure 6. The size of the first arc surface structure 5 covers the second arc surface structure 6 in the radial direction. The second arc surface structure 6 is used to contact the first arc surface structure 5 during the reciprocating motion of the piston rod 2.

[0018] For ease of explanation, let's use Figure 1The upper end of the piston rod 1 is the end away from the piston rod 2, and the lower end is the end facing the piston rod 2. The piston body and piston rod are both integrally cylindrical structures. A first arc surface structure 5 is pre-set in the slot 4 of the piston body 1, and a second arc surface structure 6 is set at the upper end of the piston rod 2. The radial projection of the first arc surface structure 5 covers the projection of the second arc surface structure 6. Thus, when the piston rod 2 reciprocates along the axial direction and comes into contact with the piston body 1, the second arc surface structure 6 contacts the first arc surface structure 5, resulting in less wear and reducing the loss caused by the frequent impact of the piston rod 2 with the piston. This improves the lifespan of the piston assembly and solves the problems of concave surfaces on the contact surface between the piston and piston rod 2 and deformation of the end cap surface on the other side of the piston. The piston body 1 and piston rod 2 have relatively simple structures that are easy to process and assemble, which helps to achieve reasonable cost, facilitate maintenance, and reduce production and maintenance costs.

[0019] In another technical solution, such as Figure 1-2 As shown, the head of the piston rod 2 is tapered and the circumferential side is in clearance fit with the slot 4. The piston rod 2 is tapered and the contact surface with the piston body 1 is arc-shaped, which makes the piston rod 2 easy to reciprocate and reduces wear on the contact surface. The clearance fit prevents the piston rod 2 from moving axially frequently and facilitates installation and disassembly.

[0020] In another technical solution, such as Figure 2-3 As shown, a pad 7 structure is assembled at the bottom of the slot 4. Positioning holes are spaced apart on the circumferential side of the pad 7. A fixing hole is provided through the piston body 1 at the position corresponding to the positioning hole of the pad 7. The piston body 1 and the pad 7 are fixed by screwing bolts 8 into the corresponding fixing hole and positioning hole. A plug 9 is welded to the outside of the fixing hole on the outside of the bolt 8. The side of the pad 7 facing the piston rod 2 is set as the first arc surface structure 5. Multiple first grooves are provided circumferentially at intervals on the side of the pad 7 facing the bottom of the slot 4. A second groove is provided at the bottom of the slot 4 corresponding to the first groove. Steel balls 10 are installed in the interior of the first groove and the second groove. The piston body 1 and the pad 7 are in contact through the steel balls 10.

[0021] The air piston assembly has a pad 7 and a steel ball 10 on one side of the shaft. The air piston body 1 contacts the pad 7 on one side of the slot 4 through the steel ball 10. The pad 7 is fixedly connected to the air piston body 1 on the circumferential side by bolts 8. A plug 9 is welded on the air piston body 1 on one side of the fixing surface. A total of six first grooves, second grooves and steel balls 10 are arranged in the circumferential direction, which play the role of reducing impact, wear resistance, vibration reduction and noise reduction.

[0022] In another technical solution, such as Figure 2-3As shown, a tiny central hole 11 is provided through the central axis of the pad 7. The pad 7 has a stepped structure 12 on the outer periphery of the bottom end near the hole groove 4. The steps are set upwards and the outer diameter gradually decreases in the radial direction, which plays a role in balancing airflow and facilitating installation and disassembly.

[0023] In another technical solution, such as Figure 1-2 As shown, the sealing assembly 3 includes sealing rings 13 and multiple sealing rings 15 spaced apart along the axial direction. The sealing rings 13 are disposed on the outer ring of the piston body 1 at the end away from the piston rod 2 and are limited by a retaining ring 14 coaxially disposed.

[0024] The outer ring of the piston body 1, near the outer periphery, is fitted with a sealing ring 13, a sealing retainer ring 14, and a sealing ring 15 in sequence downwards. The piston body 1 has a U-shaped groove radially inward at the upper end of the sealing ring 13. A groove section for installing the sealing ring 13 is provided adjacent to the U-shaped groove below it. Installing the sealing ring 13 reduces the gap between the piston and the cylinder liner and improves the sealing effect. The sealing retainer ring 14 has a T-shaped cross-section facing the U-shaped groove. It fits onto the U-shaped groove and abuts against the sealing ring 13 on the lower side, limiting the sealing ring 13 and preventing axial movement of the sealing ring 13, thus ensuring the sealing effect.

[0025] In another technical solution, such as Figure 1-2 As shown, the sealing ring 15 is provided with three layers. Similarly, a groove is opened at the corresponding position on the outer periphery of the piston body 1, and a sealing ring 15 is provided in each groove to form a three-layer sealing method, which keeps the piston in the center position of the cylinder and avoids piston off-center loading or jamming.

[0026] In another technical solution, such as Figure 1 As shown, the outer end of the slot 4 is provided with an outwardly enlarging inclined surface structure 16, which guides the piston rod 2 into the slot 4 and reduces the direct impact between the piston body 1 and the upper end of the piston rod 2.

[0027] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the drawings shown and described herein.

Claims

1. A gas piston assembly for a hydraulically driven hydrogen compressor, characterized in that, The piston includes a piston body and a piston rod. The outer ring of the piston body is fitted with sealing components at intervals along the axial direction to achieve sealing between the piston body and the cylinder liner. One end of the piston body has an inwardly opening groove along the axial direction. The head of the piston rod is used to extend into the groove. The piston body, the groove, and the piston rod are arranged coaxially. The bottom of the groove has a first arc surface structure that is recessed inward along the axial direction. The end face of the piston rod facing the first arc surface structure has a second arc surface structure. The size of the first arc surface structure covers the second arc surface structure in the radial direction. The second arc surface structure is used to contact the first arc surface structure during the reciprocating motion of the piston rod.

2. The gas piston assembly for a hydraulically driven hydrogen compressor as described in claim 1, characterized in that, The piston rod has a tapered head and a clearance fit between its circumferential side and the slot.

3. The gas piston assembly for a hydraulically driven hydrogen compressor as described in claim 1, characterized in that, A pad structure is installed at the bottom of the slot. Positioning holes are spaced apart on the circumferential side of the pad. A fixing hole is provided through the piston body at the position corresponding to the positioning hole of the pad. The piston body and the pad are fixed together by screwing bolts into the corresponding fixing hole and positioning hole. A plug is welded to the outside of the fixing hole to seal it. The side of the pad facing the piston rod is set as the first arc surface structure. Multiple first grooves are provided circumferentially at intervals on the side of the pad facing the bottom of the slot. A second groove is provided at the bottom of the slot corresponding to the first groove. Steel balls are installed inside the first groove and the second groove. The piston body and the pad are in contact through the steel balls.

4. The gas piston assembly for a hydraulically driven hydrogen compressor as described in claim 3, characterized in that, The pad has a central hole through its central axis, and a stepped structure is provided on the outer periphery of the bottom end of the pad near the hole.

5. The gas piston assembly for a hydraulically driven hydrogen compressor as described in any one of claims 1-4, characterized in that, The sealing assembly includes sealing rings spaced apart along the axial direction and multiple sealing rings. The sealing rings are disposed on the outer ring of the piston body at the end away from the piston rod and are limited by a retaining ring set coaxially.

6. The gas piston assembly for a hydraulically driven hydrogen compressor as described in claim 5, characterized in that, The sealing ring has three layers.

7. The gas piston assembly for a hydraulically driven hydrogen compressor as described in claim 1, characterized in that, The outer end of the slot is provided with an outwardly expanding inclined surface structure.

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