Hydraulically driven piston compressor with hydraulic cylinders at both ends

Abstract

The utility model provides a kind of hydraulic drive piston type compressor of hydraulic cylinder at both ends includes first module and replaceable booster cylinder module;First module is hydraulic cylinder module, including outer end cover, hydraulic cylinder body, hydraulic cylinder piston and piston rod, hydraulic piston sealing assembly, hydraulic inner end cover, flange connecting end cover, flange end cover sealing and connecting screw rod, nut and gasket;Piston rod outside is connected with hydraulic cylinder piston, inside and the outermost booster cylinder piston in booster cylinder module contact;Booster cylinder module includes at least three booster cylinder bodies that are sequentially connected, and adjacent booster cylinder bodies are connected by connecting end cover.It is divided into first module (hydraulic cylinder module) and replaceable booster cylinder module that can be independently disassembled by compressor, when disassembling and replacing sealing element, only need to disassemble flange connecting end cover and flange end cover sealing in booster cylinder module and first module, without disassembling other components of hydraulic cylinder module, greatly reduce the number of disassembling parts, shorten assembly maintenance time.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, specifically to a hydraulically driven piston compressor with hydraulic cylinders at both ends. Background Technology

[0002] Hydraulically driven reciprocating compressors, with their significant advantages, are widely used in numerous fields such as hydrogen refueling stations and laboratory testing. They can frequently start and stop under load, adapting to different scenario requirements; input pressure can be as low as 0.5 MPa, and output pressure can reach up to 200-300 MPa, covering a wide pressure range; displacement is flexibly adjustable, such as hydrogen compressors used in hydrogen refueling stations with a displacement of up to 1500 Nm³. 3 / h; oil and gas sealing and isolation is safe and reliable, and installation and maintenance are convenient and economical, so it has received widespread attention from the market.

[0003] However, existing liquid-driven reciprocating compressors still have many technical defects in practical applications, making it difficult to meet the needs of efficient operation and maintenance and multi-functional applications.

[0004] In terms of assembly and maintenance, the hydraulic drive cylinders and various compression cylinders of the related hydraulically driven reciprocating compressors often adopt an axially connected structure, secured axially by long bolts. When the seals reach the end of their service life and need replacement, disassembling the long bolts or connecting rods causes all the axially connected components to detach. During reassembly, the components must be arranged one by one in a specific order, which is not only inefficient and time-consuming but also prone to damage to equipment precision due to deviations in the assembly sequence. If applied to scenarios such as hydrogen refueling stations where continuous operation is extremely demanding, excessively long maintenance times will severely impact the normal operation of the hydrogen refueling station and reduce its economic viability.

[0005] Regarding sealing performance, reciprocating piston compressors rely on reciprocating dynamic seals. Over time, these seals are prone to wear, leading to incomplete sealing. While related technologies incorporate cooling structures, the cooling range is limited to the exterior of the cylinder, lacking a dedicated cooling solution for the internal sealing components of the end caps. During prolonged compressor operation, the internal sealing components experience increased temperature due to frictional heat, causing non-metallic seals to overheat and age, further exacerbating sealing performance degradation, shortening seal lifespan, and increasing the risk of equipment leakage. This poses a significant safety hazard, especially when compressing flammable and explosive media such as hydrogen.

[0006] In terms of functional expandability, the hydraulic drive and compression cylinder of related liquid-driven reciprocating compressors are mostly integrated designs, with fixed connections between components, making it impossible to flexibly replace the compression cylinder module according to actual compression requirements. If it is necessary to change the compressor's boosting parameters to adapt to different media or pressure requirements, the core structure of the entire compressor needs to be modified, which is not only costly but also complex to operate, making it difficult to quickly respond to diverse application scenarios and limiting the applicability of liquid-driven reciprocating compressors.

[0007] In view of the shortcomings of the above-mentioned related technologies, there is an urgent need to develop a liquid-driven reciprocating compressor with modular assembly, efficient sealing and cooling, and multi-functional expansion capabilities to solve the problems of cumbersome assembly and maintenance, easy degradation of sealing performance, and limited functionality. Utility Model Content

[0008] The purpose of this utility model is to provide a hydraulically driven piston compressor with hydraulic cylinders at both ends, aiming to solve the technical problems of cumbersome assembly and maintenance, easy degradation of sealing performance, and poor functional expandability of hydraulically driven piston compressor cylinders in related technologies.

[0009] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0010] According to a first aspect of the present invention, a hydraulically driven piston compressor with a hydraulic cylinder at both ends is provided, comprising: a first module and a replaceable booster cylinder module; the first module is a hydraulic cylinder module, including an outer end cover, a hydraulic cylinder body, a hydraulic cylinder piston and piston rod, a hydraulic piston sealing assembly, a hydraulic inner end cover, a flange connection end cover, a flange end cover seal, and connecting screws, nuts, and washers; the hydraulic cylinder piston divides the inner cavity of the hydraulic cylinder body into a hydraulic outer cavity and a hydraulic inner cavity, the hydraulic outer cavity being an oil chamber; the outer side of the piston rod is connected to the hydraulic cylinder piston, and the inner... The side contacts the outermost piston of the booster cylinder module; the flange end cap seal is used to prevent the booster medium from leaking into the hydraulic cylinder cavity; the booster cylinder module includes at least three booster cylinders connected in series, each booster cylinder is covered with a water jacket on its outer side, adjacent booster cylinders are connected by a connecting end cap, the connecting end cap is provided with a connecting end cap sealing assembly, each booster cylinder is provided with a booster cylinder piston and a booster cylinder piston sealing assembly, the booster cylinder piston divides the inner cavity of the booster cylinder into two working compression chambers; the side of the connecting end cap is provided with a water channel.

[0011] On the one hand, by dividing the compressor into an independently detachable first module (hydraulic cylinder module) and a replaceable booster cylinder module, when disassembling and replacing seals, only the booster cylinder module and the flange connection end cover and flange end cover seal in the first module need to be disassembled, without disassembling other components of the hydraulic cylinder module. This significantly reduces the number of disassembled parts, shortens assembly and maintenance time, and improves operation and maintenance efficiency, making it particularly suitable for scenarios with high requirements for continuous equipment operation, such as hydrogen refueling stations. On the other hand, the flange end cover seal can effectively isolate the booster chamber and the hydraulic cylinder chamber, preventing media leakage and contamination of the hydraulic system. Furthermore, the water jacket on the outside of each booster cylinder can cool the cylinder body, and after cooling water is introduced into the water channel on the side of the connection end cover, it can specifically cool the sealing components inside the connection end cover, prevent non-metallic seals from overheating and aging, extend the life of the seals, and ensure the sealing effect. In addition, the booster cylinder module can be replaced as needed without modifying the hydraulic cylinder module, reducing equipment modification costs and expanding the application range of the compressor.

[0012] The exemplary embodiment of this utility model provides a hydraulically driven piston compressor with hydraulic cylinders at both ends. The booster cylinder module includes a D1 booster cylinder body, a D2 booster cylinder body, and a D3 booster cylinder body. From left to right, the inner diameters of the D1, D2, and D3 booster cylinder bodies gradually decrease. The right side of the D1 booster cylinder body is connected to the left side of the D2 booster cylinder body via a D1 connecting end cap, and the right side of the D2 booster cylinder body is connected to the left side of the D3 booster cylinder body via a D2 connecting end cap. A D1 connecting end cap sealing assembly is provided inside the D1 connecting end cap, and a D2 connecting end cap sealing assembly is provided inside the D2 connecting end cap. A D1 water jacket is provided on the outer side of the D1 booster cylinder body, a D2 water jacket is provided on the outer side of the D2 booster cylinder body, and a D3 water jacket is provided on the outer side of the D3 booster cylinder body.

[0013] On the one hand, the three-stage booster cylinder design with progressively decreasing inner diameter meets the process requirement of gradually increasing pressure during gas compression, improving gas compression efficiency and pressure stability. Furthermore, each booster cylinder is connected by a dedicated connecting end cap and matching sealing components to ensure the sealing performance between adjacent cylinders and prevent medium leakage at the cylinder connection. On the other hand, the water jacket corresponding to each booster cylinder can precisely cool each cylinder, ensuring stable cylinder temperature during each stage of compression and preventing overheating of the cylinder from affecting compression efficiency or damaging equipment components.

[0014] The hydraulic cylinder provided in the exemplary embodiment of this utility model is a hydraulically driven piston compressor at both ends. The booster cylinder module can also be replaced with a third module including a D4 booster cylinder body, a D5 booster cylinder body, and a D6 booster cylinder body. The outer sides of the D4 booster cylinder body, the D5 booster cylinder body, and the D6 booster cylinder body are respectively covered with a D4 water jacket, a D5 water jacket, and a D6 water jacket. Adjacent cylinder bodies are connected by matching connecting end caps and connecting end cap sealing assemblies. Each cylinder body is provided with a corresponding booster cylinder piston and booster cylinder piston sealing assembly.

[0015] By providing a replaceable third module (including D4, D5, and D6 booster cylinders), the selection range of booster cylinder modules is further enriched. Modules can be flexibly replaced according to different media compression requirements and pressure parameter requirements without major modifications to the overall compressor structure. This significantly improves the equipment's functional expandability, reduces the cost for users to purchase new equipment to adapt to different working conditions, and enhances the equipment's market applicability.

[0016] The exemplary embodiment of this utility model provides a hydraulically driven piston compressor with hydraulic cylinders at both ends. The first module has two parts, located on both sides of the booster cylinder module. The pistons and piston rods of the two hydraulic cylinders of the first module are linked with the booster cylinder pistons in the booster cylinder module. When oil enters the outer cavity of the hydraulic cylinder of the left first module and oil exits the outer cavity of the hydraulic cylinder of the right first module, the pistons of the two hydraulic cylinders drive the piston rods and the booster cylinder pistons to move synchronously to the right in a straight line. When oil enters the outer cavity of the hydraulic cylinder of the right first module and oil exits the outer cavity of the hydraulic cylinder of the left first module, the pistons of the two hydraulic cylinders drive the piston rods and the booster cylinder pistons to move synchronously to the left in a straight line.

[0017] On the one hand, the first module (hydraulic cylinder module) is set on both sides. Through the reverse control of the hydraulic oil inlet and outlet, the synchronous bidirectional movement of the hydraulic cylinder piston, piston rod and each booster cylinder piston is realized. This allows the two working compression chambers of each booster cylinder to alternately realize the intake and compression process, forming a dual-acting compression mode, which greatly improves the gas displacement and working efficiency of the compressor and meets the high-flow compression requirements. On the other hand, the synchronous linkage structure ensures the consistency of the movement of each piston, avoids equipment jamming or component wear due to movement deviation, and extends the overall service life of the equipment.

[0018] The exemplary embodiment of this utility model provides a hydraulically driven piston compressor at both ends of a hydraulic cylinder. The hydraulic inner end cover is located inside the hydraulic cylinder body. The connecting screw passes through the outer end cover, the hydraulic cylinder body, the hydraulic inner end cover, and the flange connecting end cover in sequence, and then cooperates with the nut to fix the components of the first module.

[0019] By connecting the screw and nut, the outer end cover, hydraulic cylinder body, hydraulic inner end cover, flange connection end cover and other components of the first module are firmly fixed, ensuring the structural stability of the first module and preventing vibration or displacement caused by loose components during compressor operation, which would affect the operating accuracy of the equipment. At the same time, this fixing method is convenient to disassemble and assemble, which facilitates the subsequent inspection and maintenance of the internal components of the first module and further improves the convenience of equipment operation and maintenance.

[0020] The exemplary embodiment of this utility model provides a hydraulically driven piston compressor with hydraulic cylinders at both ends. The hydraulic piston sealing assembly is disposed between the hydraulic cylinder piston and the inner wall of the hydraulic cylinder body, and the booster cylinder piston sealing assembly is disposed between the booster cylinder piston and the inner wall of the booster cylinder body.

[0021] On the one hand, the hydraulic piston sealing assembly can effectively seal the gap between the hydraulic cylinder piston and the inner wall of the hydraulic cylinder, preventing hydraulic oil leakage between the hydraulic outer cavity and the hydraulic inner cavity, ensuring the pressure stability of the hydraulic drive system, and ensuring that the hydraulic cylinder piston can drive the piston rod to move normally. On the other hand, the booster cylinder piston sealing assembly can seal the gap between the booster cylinder piston and the inner wall of the booster cylinder, preventing the compressed medium from flowing between the two working compression chambers of the booster cylinder, ensuring the purity of the compressed medium and the accuracy of the compression pressure, and improving the working reliability of the compressor.

[0022] The exemplary embodiment of this utility model provides a hydraulically driven piston compressor with hydraulic cylinders at both ends. The water jacket is a hollow structure with an inlet and an outlet. The inlet is connected to an external cooling water supply device, and the outlet is connected to a cooling water recovery device.

[0023] The hollow water jacket, combined with the inlet and outlet, enables the cooling water to circulate within the jacket, continuously removing the heat generated by the compression process in the turbocharger cylinder, resulting in high and stable cooling efficiency. When connected to an external cooling water supply and recovery device, it forms a complete cooling circulation system, eliminating the need for frequent manual addition of cooling water, reducing labor costs, and facilitating unified treatment of the cooling water, thus meeting energy conservation and environmental protection requirements.

[0024] The exemplary embodiment of this utility model provides a hydraulically driven piston compressor at both ends of a hydraulic cylinder. The flange connection end cover is fitted to the outermost connection end cover of the booster cylinder module, and a sealing gasket is provided between the flange connection end cover and the connection end cover.

[0025] The flange connection end cover fits snugly with the booster cylinder module connection end cover, and the sealing performance between the two is further enhanced by the sealing gasket, effectively preventing the medium in the booster chamber from leaking from the connection between the first module and the booster cylinder module. The double sealing guarantee (flange end cover seal + sealing gasket) further improves the overall sealing reliability of the equipment, and is especially suitable for scenarios with flammable, explosive or easily leaking compressed media such as hydrogen.

[0026] The exemplary embodiment of this utility model provides a hydraulically driven piston compressor at both ends of a hydraulic cylinder. The inner end of the piston rod is provided with a positioning groove, and the outer end of the booster cylinder piston is provided with a positioning boss that matches the positioning groove. The positioning boss is embedded in the positioning groove.

[0027] By matching the positioning groove and the positioning boss, the piston rod and the booster cylinder piston are precisely positioned and connected, ensuring their coaxiality during movement. This avoids additional lateral forces between the piston rod and the booster cylinder piston caused by connection deviation, reducing component wear and extending the service life of the piston rod and the booster cylinder piston. At the same time, this positioning structure facilitates quick alignment during assembly, improving the assembly efficiency of the booster cylinder module and the first module.

[0028] The exemplary embodiment of this utility model provides a hydraulically driven piston compressor at both ends of a hydraulic cylinder. The water channel of the connecting end cover is provided with an inlet connector and an outlet connector. The inlet connector is connected to an external cooling water supply device, and the outlet connector is connected to a cooling water recovery device.

[0029] The inlet and outlet connectors allow the water channel on the side of the connecting end cover to easily connect with the external cooling water supply and recovery device, enabling directional circulation of cooling water within the water channel. This ensures that the cooling water continuously and stably cools the sealing components inside the connecting end cover, preventing insufficient cooling of the sealing components due to chaotic cooling water flow or insufficient supply. At the same time, the standardized connector design facilitates compatibility with different types of cooling water systems, improving the flexibility of equipment installation.

[0030] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the present invention. Attached Figure Description

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments conforming to the present invention and, together with the description, serve to explain the principles of the present invention. It is obvious that the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0032] Figure 1 This is a schematic diagram of the overall structure of the hydraulically driven piston compressor with hydraulic cylinders at both ends of the present invention (including the first modules at both ends and the D1-D2-D3 booster cylinder modules in the middle);

[0033] Figure 2 for Figure 1 A diagram showing the connection details and disassembly status of the first module and the booster cylinder module;

[0034] Figure 3 This is a schematic diagram showing the replacement of the booster cylinder modules of this utility model (the booster cylinder modules D1-D2-D3 are replaced with booster cylinder modules D4-D5-D6);

[0035] Figure 4 for Figure 3A diagram showing the connection details and disassembly status of the first module and the booster cylinder module;

[0036] Figure 5 This is a disassembly and assembly diagram of the hydraulically driven piston compressor with hydraulic cylinders at both ends of the present invention during the disassembly and replacement of seals. Detailed Implementation

[0037] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted. Furthermore, the drawings are merely illustrative of the present invention and are not necessarily drawn to scale.

[0038] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples in the accompanying drawings. It is understood that if the device of the icon is flipped so that it is upside down, the component described as "upper" will become the component described as "lower." When a structure is "upper" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0039] The terms “a,” “one,” “the,” and “at least one” are used to indicate the existence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first” and “second” are used only as markers and are not a limitation on the number of objects.

[0040] Existing hydraulically driven reciprocating compressors still have many technical defects in practical applications, making it difficult to meet the needs of efficient operation and maintenance and multi-functional applications.

[0041] In terms of assembly and maintenance, the hydraulic drive cylinders and various compression cylinders of the related hydraulically driven reciprocating compressors often adopt an axially connected structure, secured axially by long bolts. When the seals reach the end of their service life and need replacement, disassembling the long bolts or connecting rods causes all the axially connected components to detach. During reassembly, the components must be arranged one by one in a specific order, which is not only inefficient and time-consuming but also prone to damage to equipment precision due to deviations in the assembly sequence. If applied to scenarios such as hydrogen refueling stations where continuous operation is extremely demanding, excessively long maintenance times will severely impact the normal operation of the hydrogen refueling station and reduce its economic viability.

[0042] Regarding sealing performance, reciprocating piston compressors rely on reciprocating dynamic seals. Over time, these seals are prone to wear, leading to incomplete sealing. While related technologies incorporate cooling structures, the cooling range is limited to the exterior of the cylinder, lacking a dedicated cooling solution for the internal sealing components of the end caps. During prolonged compressor operation, the internal sealing components experience increased temperature due to frictional heat, causing non-metallic seals to overheat and age, further exacerbating sealing performance degradation, shortening seal lifespan, and increasing the risk of equipment leakage. This poses a significant safety hazard, especially when compressing flammable and explosive media such as hydrogen.

[0043] In terms of functional expandability, the hydraulic drive and compression cylinder of related liquid-driven reciprocating compressors are mostly integrated designs, with fixed connections between components, making it impossible to flexibly replace the compression cylinder module according to actual compression requirements. If it is necessary to change the compressor's boosting parameters to adapt to different media or pressure requirements, the core structure of the entire compressor needs to be modified, which is not only costly but also complex to operate, making it difficult to quickly respond to diverse application scenarios and limiting the applicability of liquid-driven reciprocating compressors.

[0044] Therefore, embodiments of this utility model provide a hydraulically driven piston compressor with hydraulic cylinders at both ends. This hydraulically driven piston compressor with hydraulic cylinders at both ends includes a first module and a replaceable booster cylinder module. The first module is a hydraulic cylinder module, including an outer end cover, a hydraulic cylinder body, a hydraulic cylinder piston and piston rod, a hydraulic piston sealing assembly, a hydraulic inner end cover, a flange connection end cover, a flange end cover seal, and connecting screws, nuts, and washers. The hydraulic cylinder piston divides the inner cavity of the hydraulic cylinder body into a hydraulic outer cavity and a hydraulic inner cavity, the hydraulic outer cavity being an oil chamber; the outer side of the piston rod is connected to the hydraulic cylinder piston, and the inner side contacts the outermost booster cylinder piston in the booster cylinder module; the flange end cap seal is used to prevent the booster chamber medium from leaking into the hydraulic cylinder cavity; the booster cylinder module includes at least three booster cylinder bodies connected in series, each booster cylinder body is covered with a water jacket on its outer side, adjacent booster cylinder bodies are connected by a connecting end cap, the connecting end cap is provided with a connecting end cap sealing assembly, each booster cylinder body is provided with a booster cylinder piston and a booster cylinder piston sealing assembly, the booster cylinder piston divides the inner cavity of the booster cylinder body into two working compression chambers; the side of the connecting end cap is provided with a water channel. Therefore, by dividing the compressor into an independently detachable first module (hydraulic cylinder module) and a replaceable booster cylinder module, when disassembling and replacing seals, only the booster cylinder module and the flange connection end cover and flange end cover seal in the first module need to be disassembled. There is no need to disassemble other components of the hydraulic cylinder module, which greatly reduces the number of disassembled parts, shortens assembly and maintenance time, and improves operation and maintenance efficiency. This is especially suitable for scenarios with high requirements for continuous operation of equipment, such as hydrogen refueling stations. On the other hand, the flange end cover seal can effectively isolate the booster chamber and the hydraulic cylinder chamber, avoiding media leakage and contamination of the hydraulic system. Furthermore, the water jacket on the outside of each booster cylinder can cool the cylinder body. After cooling water is introduced into the water channel on the side of the connection end cover, it can specifically cool the sealing components inside the connection end cover, prevent non-metallic seals from overheating and aging, extend the life of the seals, and ensure the sealing effect. In addition, the booster cylinder module can be replaced as needed without modifying the hydraulic cylinder module, reducing equipment modification costs and expanding the application range of the compressor.

[0045] The hydraulically driven piston compressor with hydraulic cylinders at both ends provided in the embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0046] Example 1

[0047] like Figures 1-2 As shown, this embodiment provides a hydraulically driven piston compressor with hydraulic cylinders at both ends based on the D1-D2-D3 booster cylinder module. It is applicable to hydrogen compression in hydrogen refueling stations. This compressor uses the D1-D2-D3 booster cylinder module and achieves efficient and stable hydrogen compression through modular assembly and synergistic cooling design. The specific assembly and operation process are as follows:

[0048] First, the assembly process:

[0049] S1. Assembly of the first module:

[0050] The hydraulic piston sealing assembly 104 is embedded into the sealing groove of the hydraulic cylinder piston. Then, the hydraulic cylinder piston and piston rod 103 are installed into the hydraulic cylinder body 102. During the assembly process, it is ensured that the hydraulic cylinder piston and piston rod 103 slide smoothly in the hydraulic cylinder body 102 without jamming or displacement. This operation can ensure the stability of subsequent hydraulic drive and avoid the reduction of compression efficiency due to piston jamming.

[0051] The hydraulic inner end cap 105 and the flange connection end cap 106 are sequentially attached to the inside of the hydraulic cylinder body 102. Then, the flange end cap seal 107 is embedded into the sealing groove of the flange connection end cap 106 to ensure that the flange end cap seal 107 and the sealing groove are fully adapted and without gaps. This step can avoid the risk of leakage of the pressurized chamber medium into the hydraulic cylinder cavity in advance and lay the foundation for subsequent sealing performance.

[0052] Insert the connecting screw 108, then sequentially insert the washer 110 and tighten the nut 109 to ensure that all components of the first module are firmly connected and without looseness. Repeat the above steps to assemble the first module on the other side, ensuring that the structures of the two first modules are symmetrical and their specifications are consistent. Symmetrical assembly can balance the hydraulic driving force on both sides, avoiding equipment vibration caused by uneven force on one side and extending the overall service life of the equipment.

[0053] S2, Booster Cylinder Module Assembly:

[0054] The piston sealing assembly 204 of the D1 booster cylinder is embedded in the sealing groove of the piston 202 of the D1 booster cylinder, and the piston 202 of the D1 booster cylinder is installed into the body 201 of the D1 booster cylinder, ensuring that the piston of the D1 booster cylinder fits tightly against the inner wall of the body 201 of the D1 booster cylinder. This design can effectively prevent gas from crossing between the two working compression chambers in the body 201 of the D1 booster cylinder, and ensure the pressure accuracy of the first stage compression.

[0055] The D1 connecting end cap sealing assembly 205 is embedded in the sealing groove of the D1 connecting end cap 206, and the D1 connecting end cap 206 is fixed to the D1 booster cylinder body 201 by bolts, ensuring that the D1 connecting end cap 206 and the D1 booster cylinder body 201 fit flat and without misalignment. This fixing method can enhance the connection stability between the D1 booster cylinder body 201 and the D1 connecting end cap 206, and at the same time, the D1 connecting end cap sealing assembly 205 can further block the gas leakage path.

[0056] The D2 booster cylinder body 211, the D2 connecting end cover 208, and the D3 booster cylinder body 218 are assembled in sequence. During the assembly process, the coaxiality of each cylinder body is strictly controlled to avoid affecting the synchronous movement of the D2 booster cylinder piston and piston rod 209 and the D3 booster cylinder piston due to coaxiality deviation.

[0057] The D1 water jacket 203, D2 water jacket 212, and D3 water jacket 217 are respectively fitted onto the outside of the D1 booster cylinder 201, D2 booster cylinder 211, and D3 booster cylinder 218, ensuring that each water jacket fits snugly against the corresponding booster cylinder without gaps. This operation maximizes the contact area between the water jacket and the cylinder, improves subsequent cooling efficiency, and avoids uneven cooling due to loose water jackets.

[0058] Pre-connect the inlet connector 403 and outlet connector 404 of the connecting end cap to the external cooling water pipe.

[0059] S3. Overall Assembly:

[0060] The D1-D2-D3 booster cylinder module is placed between the two first modules, so that the D1 connecting end cap 206 is fitted with the flange connecting end cap 106 of the left first module, and the D3 connecting end cap 213 is fitted with the flange connecting end cap 106 of the right first module. This fitting method facilitates subsequent modular disassembly, and the booster cylinder module can be replaced without disassembling the entire first module.

[0061] Adjust the coaxiality of each module to ensure that the positioning groove of the piston rod 103 is precisely engaged with the positioning boss of the D1 booster cylinder piston and the D3 booster cylinder piston. This engagement structure can ensure that the hydraulic cylinder piston and piston rod 103 move synchronously with each booster cylinder piston, avoid the compression rhythm disorder caused by movement deviation, and improve compression efficiency.

[0062] Insert the cross-module connecting screw 219, put on the washer 221, and tighten the nut 220 to ensure that the overall structure is firmly connected and without loosening. A firm connection can reduce vibration and noise during equipment operation and improve the safety and stability of equipment operation.

[0063] Connect the hydraulic system to the hydraulic cylinder body 102 via the hydraulic external cavity interface, connect the cooling water supply device to the inlet and outlet water interfaces of the D1 water jacket 203, D2 water jacket 212, D3 water jacket 217 and water tank flow channel, connect the hydrogen inlet pipe to the inlet of the D1 booster cylinder body 201 and the hydrogen exhaust pipe to the exhaust port of the D3 booster cylinder body 218, and complete the overall assembly.

[0064] Second, the work process:

[0065] Intake and Compression (Piston Rod Moves to the Right): Oil enters the hydraulic outer chamber of the first module on the left and exits from the hydraulic outer chamber of the first module on the right. Under the thrust of the hydraulic oil, the piston and piston rod 103 of the left hydraulic cylinder move to the right, and the piston and piston rod 103 of the right hydraulic cylinder move to the right simultaneously, driving the piston of the D1 booster cylinder, the piston and piston rod 209 of the D2 booster cylinder, and the piston of the D3 booster cylinder to slide to the right. At this time, the left working compression chamber of the D1 booster cylinder 201 takes in air, and the right working compression chamber compresses the hydrogen and sends it to the D2 booster cylinder 211; the left working compression chamber of the D2 booster cylinder 211 takes in air, and the right working compression chamber further compresses the hydrogen and sends it to the D3 booster cylinder 218; the left working compression chamber of the D3 booster cylinder 218 takes in air, and the right working compression chamber compresses the hydrogen to the target pressure and discharges it to the hydrogen storage tank of the hydrogen refueling station through the main exhaust port 502. This dual-acting compression mode allows the two working chambers of each booster cylinder to work alternately, doubling the gas displacement compared to single-acting compression, which can quickly meet the hydrogen supply needs of hydrogen refueling stations.

[0066] Reverse intake and compression (piston rod moves to the left): Oil enters the hydraulic outer chamber of the first module on the right and exits from the hydraulic outer chamber of the first module on the left; all pistons slide synchronously to the left, the right working compression chamber of the D1 booster cylinder 201 intakes air and the left working compression chamber compresses and exhausts air; the right working compression chamber of the D2 booster cylinder 211 intakes air and the left working compression chamber compresses and exhausts air; the right working compression chamber of the D3 booster cylinder 218 intakes air and the left working compression chamber compresses and exhausts air. Continuous bidirectional compression ensures a continuous supply of hydrogen, avoiding supply interruptions caused by unidirectional compression and improving the continuity of hydrogen refueling station operations.

[0067] Cooling process: Cooling water enters the D1 water jacket 203, D2 water jacket 212, and D3 water jacket 217 through inlet 401, absorbing the heat generated by compression in the D1 booster cylinder 201, D2 booster cylinder 211, and D3 booster cylinder 218 before being discharged from outlet 402. Simultaneously, cooling water enters the water channel of the connecting end cover through inlet connector 403, cooling the sealing components such as the D1 connecting end cover sealing assembly 205 and D2 connecting end cover sealing assembly 207, before being discharged from outlet connector 404. This dual cooling design prevents deformation of the booster cylinder due to high temperatures and also prevents aging of the sealing components due to high temperatures, extending the lifespan of the sealing components by more than double and reducing equipment maintenance frequency and costs.

[0068] Third, such as Figure 5 As shown, when disassembling and replacing the seals, the entire booster cylinder module needs to be disassembled. However, for the first module, apart from removing the flange connection end cover 106 and the flange end cover seal 107, the rest remain in their original assembly state and do not need to be disassembled.

[0069] The hydraulically driven piston compressor at both ends of the D1-D2-D3 booster cylinder module provided in this embodiment exhibits advantages in the following aspects:

[0070] In terms of assembly and maintenance: The independent assembly design of the first module and the booster cylinder module means that the first module does not need to be disassembled as a whole when replacing the seals. Only the booster cylinder module or the flange connection end cover 106 and the flange end cover seal 107 need to be specifically treated, which shortens the maintenance time and improves the operating efficiency of the hydrogen refueling station.

[0071] In terms of sealing performance: The flange end cover seal 107, D1 connection end cover seal assembly 205 and other multiple sealing structures, together with the cooling system to protect the seals, keep the hydrogen leakage rate at an extremely low level, meet the safety standards of hydrogen refueling stations, and avoid the risk of hydrogen leakage.

[0072] In terms of compression efficiency: The dual-acting three-stage compression mode and the synchronous movement design of each piston improve hydrogen compression efficiency, which can quickly meet the high-flow hydrogen demand of hydrogen refueling stations and enhance the service capacity of hydrogen refueling stations.

[0073] Example 2

[0074] like Figures 3-4 As shown, this embodiment provides a hydraulically driven piston compressor based on a D4-D5-D6 booster cylinder module with hydraulic cylinders at both ends. This compressor, by replacing the booster cylinder module, replaces the original D1-D2-D3 module with the D4-D5-D6 module while retaining the first module, to adapt to the high-pressure gas detection requirements of the laboratory.

[0075] The module replacement process of this embodiment will be described below with reference to the accompanying drawings.

[0076] S1. Disassemble the original booster cylinder module:

[0077] First, shut down the hydraulic system and cooling water system to release the hydraulic pressure in the hydraulic cylinder body 102 and the gas pressure in the D1-D2-D3 booster cylinder modules.

[0078] Disassemble the cross-module connecting screw connecting the first module and the D1-D2-D3 module, and then manually or with the help of simple tools remove the original D1-D2-D3 booster cylinder module. The entire disassembly process does not require disassembling the core components of the first module, such as the hydraulic cylinder body 102, the hydraulic cylinder piston, and the piston rod 103. The operation is simple and time-saving.

[0079] Inspect the flange connection end cover 106 and the flange end cover seal 107, and retain them after confirming that they are undamaged and undeformed.

[0080] S2. Install the D4-D5-D6 booster cylinder module:

[0081] The pre-assembled D4-D5-D6 modules (including components such as D4 booster cylinder body 301, D4 water jacket 303, D5 booster cylinder body 311, D5 water jacket 312, D6 booster cylinder body 318, and D6 water jacket 317) are placed between the two first modules. The module positions are adjusted so that the D4 connecting end cover 306 is fitted with the flange connecting end cover 106 of the left first module, and the D6 connecting end cover 313 is fitted with the flange connecting end cover 106 of the right first module, ensuring that the connection parts are aligned, laying the foundation for subsequent precise assembly.

[0082] Insert the cross-module connecting screw, put on the washer, and tighten the nut to ensure that modules D4-D5-D6 are securely connected to the first module without any looseness. A secure connection ensures that there is no relative displacement between modules during high-pressure compression, avoiding gas leakage or component wear caused by displacement.

[0083] Connect the cooling water pipe to the interfaces of the D4 water jacket 303, D5 water jacket 312, D6 water jacket 317 and the water channel of the end cover, connect the special gas intake pipe to the intake port of the D4 booster cylinder 301 and the exhaust pipe to the exhaust port of the D6 booster cylinder 318 to complete the module replacement.

[0084] This embodiment upgrades equipment functionality simply by replacing the booster cylinder module, eliminating the need to purchase a completely new compressor. This reduces equipment modification costs and significantly lowers the laboratory equipment procurement budget. Furthermore, the module replacement process does not require disassembling the core components of the first module, shortening the overall time required. Compared to the modification cycle of traditional integrated compressors, this improves efficiency and quickly meets laboratory testing needs. In terms of adaptability, the D4-D5-D6 modules are designed for high-pressure and specialty gas scenarios, stably compressing helium and other specialty gases with high purity and precise pressure, meeting the gas quality requirements of high-precision laboratory testing and expanding the compressor's application scenarios.

[0085] The connection between the first module and the booster cylinder module employs a dual-protection structure of "flange end cap seal 107 + positioning fit". The flange end cap seal 107 uses a sealing material adapted to the characteristics of the compressed medium, effectively blocking leakage paths for different media. Simultaneously, the piston rod 103 engages with the positioning boss-groove of the booster cylinder piston, ensuring no misalignment at the connection and preventing seal failure due to assembly deviations. This design enables the equipment to maintain excellent sealing performance in various media environments, such as hydrogen and helium, enhancing its versatility.

[0086] The D1 water jacket 203, D2 water jacket 212, and D3 water jacket 217 (or D4 water jacket 303, D5 water jacket 312, and D6 water jacket 317) share a cooling water supply system with the water channel of the connecting end cover, but cool the booster cylinder and sealing components separately through independent channels. This design ensures that the heat generated by the booster cylinder during compression is efficiently carried away, preventing cylinder deformation, and also allows for targeted cooling of the sealing components, preventing them from aging due to high temperatures. This achieves a rational allocation of cooling resources and improves the overall efficiency of the cooling system.

[0087] This invention effectively solves the technical defects of existing liquid-driven reciprocating compressors, such as cumbersome assembly and maintenance, easy degradation of sealing performance, and poor functional expandability, through modular design, efficient cooling structure, and flexible module replacement scheme. It can be widely used in various scenarios such as hydrogen refueling stations, laboratories, and industrial gas compression, and has significant practicality and economy.

[0088] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments thereof. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not covered by the invention. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the appended claims.

Claims

1. A hydraulically driven piston compressor with hydraulic cylinders at both ends, characterized in that, include: The first module and a replaceable booster cylinder module; the first module is a hydraulic cylinder module, including an outer end cover, a hydraulic cylinder body, a hydraulic cylinder piston and piston rod, a hydraulic piston sealing assembly, a hydraulic inner end cover, a flange connection end cover, a flange end cover seal, and connecting screws, nuts, and washers; the hydraulic cylinder piston divides the inner cavity of the hydraulic cylinder body into a hydraulic outer cavity and a hydraulic inner cavity, the hydraulic outer cavity being an oil cavity; the outer side of the piston rod is connected to the hydraulic cylinder piston, and the inner side contacts the outermost booster cylinder piston in the booster cylinder module; the flange end cover seal is used to prevent the booster cavity medium from leaking into the hydraulic cylinder cavity; the booster cylinder module includes at least three booster cylinder bodies connected in series, each booster cylinder body is covered with a water jacket on its outer side, adjacent booster cylinder bodies are connected by a connecting end cover, the connecting end cover is provided with a connecting end cover sealing assembly, each booster cylinder body is provided with a booster cylinder piston and a booster cylinder piston sealing assembly, the booster cylinder piston divides the inner cavity of the booster cylinder body into two working compression chambers; the side of the connecting end cover is provided with a water channel.

2. The hydraulically driven piston compressor with hydraulic cylinders at both ends as described in claim 1, characterized in that, The booster cylinder module includes a D1 booster cylinder body, a D2 booster cylinder body, and a D3 booster cylinder body. From left to right, the inner diameters of the D1, D2, and D3 booster cylinder bodies gradually decrease. The right side of the D1 booster cylinder body is connected to the left side of the D2 booster cylinder body via a D1 connecting end cap, and the right side of the D2 booster cylinder body is connected to the left side of the D3 booster cylinder body via a D2 connecting end cap. The D1 connecting end cap contains a D1 connecting end cap sealing assembly, and the D2 connecting end cap contains a D2 connecting end cap sealing assembly. The outer side of the D1 booster cylinder body is covered with a D1 water jacket, the outer side of the D2 booster cylinder body is covered with a D2 water jacket, and the outer side of the D3 booster cylinder body is covered with a D3 water jacket.

3. The hydraulically driven piston compressor with hydraulic cylinders at both ends according to claim 1, characterized in that, The booster cylinder module can also be replaced by a third module including a D4 booster cylinder body, a D5 booster cylinder body, and a D6 booster cylinder body. The outer sides of the D4 booster cylinder body, the D5 booster cylinder body, and the D6 booster cylinder body are respectively covered with a D4 water jacket, a D5 water jacket, and a D6 water jacket. Adjacent cylinder bodies are connected by matching connecting end caps and connecting end cap sealing assemblies. Each cylinder body is provided with a corresponding booster cylinder piston and booster cylinder piston sealing assembly.

4. The hydraulically driven piston compressor with hydraulic cylinders at both ends according to claim 1, characterized in that, The first module has two parts, located on both sides of the booster cylinder module. The hydraulic cylinder pistons and piston rods of the two first modules are linked with the booster cylinder pistons in the booster cylinder module. When oil enters the outer cavity of the hydraulic cylinder of the left first module and oil exits the outer cavity of the hydraulic cylinder of the right first module, the pistons of the hydraulic cylinders on both sides drive the piston rods and the booster cylinder pistons to move synchronously to the right in a straight line. When oil enters the outer cavity of the hydraulic cylinder of the right first module and oil exits the outer cavity of the hydraulic cylinder of the left first module, the pistons of the hydraulic cylinders on both sides drive the piston rods and the booster cylinder pistons to move synchronously to the left in a straight line.

5. The hydraulically driven piston compressor with hydraulic cylinders at both ends according to claim 1, characterized in that, The hydraulic inner end cap is located inside the hydraulic cylinder body. The connecting screw passes through the outer end cap, the hydraulic cylinder body, the hydraulic inner end cap, and the flange connecting end cap in sequence, and then engages with the nut to fix the components of the first module.

6. The hydraulically driven piston compressor with hydraulic cylinders at both ends according to claim 1, characterized in that, The hydraulic piston sealing assembly is disposed between the hydraulic cylinder piston and the inner wall of the hydraulic cylinder body, and the booster cylinder piston sealing assembly is disposed between the booster cylinder piston and the inner wall of the booster cylinder body.

7. The hydraulically driven piston compressor with hydraulic cylinders at both ends according to claim 1, characterized in that, The water jacket is a hollow structure with an inlet and an outlet. The inlet is connected to an external cooling water supply device, and the outlet is connected to a cooling water recovery device.

8. The hydraulically driven piston compressor with hydraulic cylinders at both ends according to claim 1, characterized in that, The flange connection end cover is fitted to the outermost connection end cover of the booster cylinder module, and a sealing gasket is provided between the flange connection end cover and the connection end cover.

9. The hydraulically driven piston compressor with hydraulic cylinders at both ends according to claim 4, characterized in that, The piston rod has a positioning groove at its inner end and a positioning boss that matches the positioning groove at its outer end. The positioning boss is embedded in the positioning groove.

10. The hydraulically driven piston compressor with hydraulic cylinders at both ends according to claim 1, characterized in that, The water channel of the connecting end cover is provided with an inlet connector and an outlet connector. The inlet connector is connected to an external cooling water supply device, and the outlet connector is connected to a cooling water recovery device.

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