Hydraulic drive liquid piston fluid conveying device

Abstract

A hydraulically-driven liquid piston fluid conveying device comprises a first conveying tank and a second conveying tank, suction and discharge one-way valves are arranged on the tops of the first conveying tank and the second conveying tank, and the first conveying tank and the second conveying tank are configured to alternately suck fluid and discharge fluid; the liquid piston driving device is hydraulically driven, is communicated with the first transmission tank and the second transmission tank, and is configured to press working liquid into one of the first transmission tank and the second transmission tank to enable one of the first transmission tank and the second transmission tank to discharge fluid; meanwhile, the working liquid is pumped away from the other one of the first conveying tank and the second conveying tank, so that the other one of the first conveying tank and the second conveying tank sucks the fluid.

Description

Technical Field

[0001] The present disclosure relates to the technical field of compressors, and in particular to a hydraulically driven liquid piston fluid delivery device. Background Art

[0002] In the later stage of natural gas field production, as the gas reservoir pressure gradually decreases and the flow rate in the gas well decreases, liquid accumulation in the well pipe often occurs, which hinders natural gas production. If it is not properly handled, it may even cause flooding, making it impossible to produce natural gas and shortening the life of the gas well. Wellhead pressurization is a low-investment and effective solution. By sucking with a compressor, the natural gas wellhead pressure is reduced, the pressure difference between the gas reservoir and the wellhead is increased, thereby increasing the flow rate in the well pipe and carrying the liquid in the well pipe to the ground. However, due to the complex process conditions of natural gas wells, the wide range of operating conditions, and the random gas-liquid ratio from 0-100%, there is currently no mature wellhead pressurization equipment. Using a pump to pump and pressurize will cause the discharge temperature to be too high when the gas component is high, resulting in damage. When using a compressor to pressurize, it will cause excessive impact in the compression cylinder when the liquid component is high, resulting in damage. It is urgent to invent an oil and gas mixed transmission device with a wide operating condition, high reliability, and arbitrary mixing of gas and liquid and arbitrary fluctuations to solve this problem.

[0003] In the field of hydrogen energy, hydrogen energy has been increasingly valued and developed by countries around the world for its environmental and economic advantages, and the compressor for hydrogen fuel cells is an indispensable equipment for the development of the hydrogen energy industry. In order to ensure its efficiency and life, hydrogen fuel cells have extremely high requirements for the purity of hydrogen (above 99.97%). The hydrogen station compressor needs to pressurize the hydrogen in the hydrogen transport vehicle to 45-90 MPa before filling it into the hydrogen energy vehicle. The high pressure, high purity compression brings huge challenges to the hydrogen station compressor in terms of leakage, wear, reliability, hydrogen embrittlement, frequent start and stop, etc., which leads to the high cost of hydrogen compressors and the high failure rate, which hinders the speed of hydrogen energy promotion. It is necessary to invent a hydrogen compressor with high reliability, satisfactory requirements and low cost to further promote the development of hydrogen energy. Summary of the invention

[0004] The present disclosure provides a hydraulically driven liquid piston fluid delivery device, comprising:

[0005] A first transmission tank and a second transmission tank are provided with suction and discharge check valves on the top, and are configured to alternately suck in fluid and discharge fluid;

[0006] The liquid piston driving device is hydraulically driven and is connected to the first transmission tank and the second transmission tank. It is configured to press the working liquid into one of the first transmission tank and the second transmission tank so that the one of the first transmission tank and the second transmission tank discharges the fluid, and at the same time, draw the working liquid out of the other of the first transmission tank and the second transmission tank so that the other of the first transmission tank and the second transmission tank inhales the fluid.

[0007] In some embodiments, the liquid piston drive device includes:

[0008] The hydraulic cylinder comprises a first hydraulic chamber and a second hydraulic chamber, wherein the first hydraulic chamber and the second hydraulic chamber are filled with hydraulic oil, and a hydraulic piston is arranged inside the hydraulic cylinder;

[0009] a hydraulic station, which is in communication with the hydraulic cylinder and includes a hydraulic pump and a hydraulic oil reversing mechanism, wherein the hydraulic oil cooperates with the hydraulic oil reversing mechanism to alternately inject hydraulic oil into the first hydraulic chamber and the second hydraulic chamber, so that the volumes of the first hydraulic chamber and the second hydraulic chamber are alternately increased or decreased and the hydraulic piston is driven by the hydraulic oil to reciprocate in the hydraulic cylinder; and

[0010] The first cylinder body and the second cylinder body are respectively arranged on both sides of the hydraulic cylinder. The interior of the first cylinder body is divided into a first chamber and a second chamber by a first piston. The interior of the second cylinder body is divided into a third chamber and a fourth chamber by a second piston. The first chamber, the second chamber, the third chamber and the fourth chamber are filled with working fluid.

[0011] The first piston and the second piston are fixedly connected to the hydraulic piston through piston rods, respectively, and each of the first transmission tank and the second transmission tank is connected to at least one chamber in any one of the first cylinder body and the second cylinder body.

[0012] In some embodiments, each of the first transmission tank and the second transmission tank is connected to the fluid input pipe through a one-way valve so that the upstream fluid can only flow into the transmission tank in one direction, and each of the first transmission tank and the second transmission tank is connected to the fluid output pipe through a one-way valve so that the fluid can only flow out of the transmission tank to the downstream in one direction.

[0013] In some embodiments, in response to the hydraulic piston moving away from the first cylinder and approaching the second cylinder, the working fluid in the first transmission tank flows out, sucking in fluid, and the working fluid in the second transmission tank increases, discharging fluid;

[0014] In response to the hydraulic piston moving away from the second cylinder and approaching the first cylinder, the working fluid in the second transmission tank flows out, sucking in fluid, and the working fluid in the first transmission tank increases, discharging fluid.

[0015] In some embodiments, the first transmission tank is connected to the first chamber and the third chamber through a pipeline;

[0016] The second transmission tank is communicated with the second chamber and the fourth chamber through a pipeline.

[0017] In some embodiments, a first switch valve is provided on the pipeline between the first transmission tank and the third chamber, and a second switch valve is provided on the pipeline between the second transmission tank and the second chamber.

[0018] The second chamber is connected to the third chamber through a pipeline, and a third switch valve is arranged on the pipeline between the second chamber and the third chamber.

[0019] When the first switch valve and the second switch valve are opened and the third switch valve is closed, the first transmission tank is connected to the first chamber and the third chamber, and the second transmission tank is connected to the second chamber and the fourth chamber.

[0020] When the first switch valve and the second switch valve are closed and the third switch valve is opened, the first transmission tank is connected only to the first chamber, the second transmission tank is connected only to the fourth chamber, and the second chamber is connected to the third chamber.

[0021] In some embodiments, the hydraulic piston includes a first hydraulic piston that separates the first hydraulic chamber and a second hydraulic chamber.

[0022] In some embodiments, the hydraulic cylinder comprises:

[0023] A first isolation chamber is arranged on a side of the first hydraulic chamber close to the first cylinder body;

[0024] The second isolation chamber is arranged on a side of the second hydraulic chamber close to the second cylinder body.

[0025] In some embodiments, a partition wall is provided in the hydraulic cylinder, and the partition wall separates the first hydraulic chamber and the second hydraulic chamber.

[0026] The hydraulic piston comprises a second hydraulic piston and a third hydraulic piston fixedly connected by a piston rod, the second hydraulic piston separates the first isolation chamber and the first hydraulic chamber, and the third hydraulic piston separates the second isolation chamber and the second hydraulic chamber.

[0027] In some embodiments, a pipeline communicating with the first transmission tank or the second transmission tank for transmitting the working fluid is provided with a cooler.

[0028] Compared with the prior art, the above solution of the embodiment of the present disclosure has at least the following beneficial effects:

[0029] In the present disclosure, the first transmission tank and the second transmission tank are used to alternately inhale and discharge fluid to realize the transmission of fluid. The liquid piston driving device is connected to the first transmission tank and the second transmission tank, and the working liquid is pressed into one of the first transmission tank and the second transmission tank so that the one of the first transmission tank and the second transmission tank discharges the fluid. At the same time, the working liquid is extracted from the other of the first transmission tank and the second transmission tank so that the other of the first transmission tank and the second transmission tank inhales the fluid. The hydraulically driven liquid piston fluid conveying device provided by the present disclosure can compress and transmit fluid media of any gas-liquid ratio. The compression ratio can be very high and almost unlimited, and the inlet and outlet pressure difference can be adjusted by valve switching. In the field of hydrogen energy, the moving parts of the transmission device do not contact hydrogen, there is no risk of hydrogen embrittlement, and there is no need to use high-cost hydrogen embrittlement-resistant materials to manufacture moving parts that require precision processing, which can significantly reduce costs. At the same time, single-stage compression can be achieved to achieve a high compression ratio, reduce the number of compression stages, and simplify the structure to further save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of a hydraulically driven liquid piston fluid delivery device provided in some embodiments of the present disclosure is shown;

[0031] Figure 2 A schematic diagram of the structure of a hydraulically driven liquid piston fluid delivery device provided in some embodiments of the present disclosure is shown;

[0032] Figure 3 A schematic diagram of the structure of a hydraulically driven liquid piston fluid delivery device provided in some embodiments of the present disclosure is shown;

[0033] Figure 4 A schematic diagram of the structure of a hydraulically driven liquid piston fluid delivery device provided in some embodiments of the present disclosure is shown;

[0034] Figure 5 A schematic diagram of the structure of a hydraulically driven liquid piston fluid delivery device provided in some embodiments of the present disclosure is shown;

[0035] Figure 6 A schematic structural diagram of a hydraulically driven liquid piston fluid delivery device provided in some embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0037] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments, and are not intended to limit the present disclosure. The singular forms "a", "said" and "the" used in the embodiments of the present disclosure and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0038] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0039] It should be understood that although the terms first, second, third, etc. may be used to describe structures in the disclosed embodiments, these structures should not be limited to these terms. These terms are only used to distinguish different structures. For example, without departing from the scope of the disclosed embodiments, a first component may also be referred to as a second component, and similarly, a second component may also be referred to as a first component.

[0040] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0041] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0042] In the field of mixed oil and gas transportation, pump products cannot transport media with high gas content. Compression heat and friction heat may cause the temperature to rise and the rotor to lock, resulting in increased internal leakage and reduced efficiency. The lack of internal compression process further reduces efficiency. Compressor products cannot transport media with high liquid content. The liquid is not compressible or has very low compressibility, which will result in excessive load. Reciprocating compressors will experience gas valve liquid hammer, and rotary compressors have a fixed internal volume ratio, which will cause the rotor to get stuck and unable to rotate.

[0043] In the field of hydrogen energy, the moving parts in the compressor structure are usually made of metal materials. When they come into contact with hydrogen, hydrogen embrittlement will occur. Hydrogen atoms penetrate into the metal material, causing uneven stress distribution of the metal material, reduced strength and increased brittleness, which are prone to cracks and breakage, causing safety hazards. Hydrogen embrittlement-resistant materials are expensive, low in strength, and difficult to process, which will lead to excessively high costs for hydrogen compressors.

[0044] The present disclosure provides a hydraulically driven liquid piston fluid delivery device, comprising:

[0045] The first transmission tank and the second transmission tank are provided with suction and discharge one-way valves on the top, and are configured to alternately suck in and discharge fluid; the liquid piston drive device is hydraulically driven, connected to the first transmission tank and the second transmission tank, and is configured to press the working fluid into one of the first transmission tank and the second transmission tank so that one of the first transmission tank and the second transmission tank discharges the fluid, and at the same time, the working fluid is extracted from the other of the first transmission tank and the second transmission tank so that the other of the first transmission tank and the second transmission tank inhales the fluid.

[0046] In the present disclosure, the first transmission tank and the second transmission tank with suction and discharge check valves on the top are used to alternately suck in and discharge fluid to realize the transmission of fluid. The liquid piston driving device is connected to the first transmission tank and the second transmission tank, and the working liquid is pressed into one of the first transmission tank and the second transmission tank so that the first transmission tank and the second transmission tank discharge the fluid. At the same time, the working liquid is extracted from the other of the first transmission tank and the second transmission tank so that the other of the first transmission tank and the second transmission tank sucks in the fluid. The hydraulically driven liquid piston fluid conveying device provided by the present disclosure can compress and transmit the medium of any gas-liquid ratio. The compression ratio can be very high and almost unlimited, and the inlet and outlet pressure difference can be adjusted by valve switching. In the field of hydrogen energy, the moving parts of the conveying device do not contact hydrogen, there is no risk of hydrogen embrittlement, and it is ineffective to use high-cost anti-hydrogen embrittlement materials to manufacture the moving parts, which can significantly reduce costs. At the same time, single-stage compression can be achieved to achieve a high compression ratio, reduce the number of compression stages, and simplify the structure to further save costs.

[0047] The optional embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0048] Figure 1 FIG. 1 shows a schematic diagram of a structure of a hydraulically driven liquid piston fluid delivery device provided in some embodiments of the present disclosure, such as Figure 1 As shown, the present disclosure provides a hydraulically driven liquid piston fluid delivery device 100 , which includes: a first transmission tank 10 , a second transmission tank 20 and a liquid piston driving device 30 .

[0049] The first transmission tank 10 and the second transmission tank 20 are, for example, arranged vertically side by side, and are provided with suction and discharge one-way valves on the top, and are configured to alternately suck in and discharge fluid, and the fluid may be gas, liquid, or a mixture of gas and liquid. Figure 1 Arrows are used to indicate the inflow and outflow directions of the fluid. Each of the first transmission tank 10 and the second transmission tank 20 is connected to the fluid input pipe and the fluid output pipe. The first transmission tank 10 and the second transmission tank 20 alternately transmit the fluid, for example, to realize oil and gas collection in the weather gas field and to realize hydrogen pressurization and filling at the hydrogen filling station.

[0050] The liquid piston driving device 30 is connected to the first transmission tank 10 and the second transmission tank 20, and is hydraulically driven, and is configured to press the working liquid into one of the first transmission tank 10 and the second transmission tank 20 so that the head space of one of the first transmission tank 10 and the second transmission tank 20 is reduced, thereby compressing or discharging the fluid, and at the same time, the working liquid is extracted from the other of the first transmission tank 10 and the second transmission tank 20 so that the head space of the other of the first transmission tank 10 and the second transmission tank 20 is increased, thereby sucking the fluid, thereby realizing the alternating transmission of the fluid by the first transmission tank 10 and the second transmission tank 20. Different liquids can be used according to different requirements. For example, when the transmission fluid is a natural gas wellhead oil-gas mixture, oils, emulsifiers, antifreeze and other liquids can be used. When the transmission fluid is high-purity hydrogen, extremely low-volatile liquids such as ionic liquids can be used.

[0051] In some embodiments, Figure 1 As shown, the liquid piston driving device 30 includes a hydraulic cylinder 31 , a hydraulic station 32 , a first cylinder body 33 and a second cylinder body 34 .

[0052] The hydraulic station includes a hydraulic pump, an oil tank and a hydraulic oil reversing mechanism. The hydraulic oil cooperates with the hydraulic oil reversing mechanism to alternately inject hydraulic oil into the first hydraulic chamber and the second hydraulic chamber, so that the volume of the first hydraulic chamber and the second hydraulic chamber is alternately increased or decreased and the hydraulic piston is driven to reciprocate in the hydraulic cylinder by the hydraulic oil. A hydraulic piston 40 is arranged inside the hydraulic cylinder 31. When the first hydraulic chamber 311 is connected to the high-pressure hydraulic oil output by the hydraulic pump and the second hydraulic chamber 312 is connected to the hydraulic oil tank with normal pressure, the hydraulic piston 40 moves to the right in the hydraulic cylinder 31. When the hydraulic piston 40 moves to the right dead point, the hydraulic oil reversing mechanism reverses, the first hydraulic chamber 311 is connected to the hydraulic oil tank with normal pressure and the second hydraulic chamber 312 is connected to the high-pressure hydraulic oil output by the hydraulic pump, and the hydraulic piston 40 moves to the left in the hydraulic cylinder. When it moves to the left dead point, the hydraulic oil reversing mechanism reverses again, and so on.

[0053] The first cylinder body 33 and the second cylinder body 34 are respectively arranged on both sides of the hydraulic cylinder 31. The interior of the first cylinder body 31 is divided into a first chamber 331 and a second chamber 332 by the first piston 51. The interior of the second cylinder body 34 is divided into a third chamber 341 and a fourth chamber 342 by the second piston 52. The first chamber 331, the second chamber 332, the third chamber 341 and the fourth chamber 342 are filled with working fluid.

[0054] The first piston 51 and the second piston 52 are fixedly connected to the hydraulic piston 40 via piston rods, respectively. Each of the first transmission tank 10 and the second transmission tank 20 is connected to at least one chamber in any one of the first cylinder 33 and the second cylinder 34 .

[0055] In some embodiments, Figure 1 As shown, the first transmission tank 10 is connected to the first chamber 331 of the first cylinder 33 and the third chamber 341 of the second cylinder 34 through a pipeline, and the working fluid can be transmitted between the first transmission tank 10 and the first chamber 331, and between the first transmission tank 10 and the third chamber 341.

[0056] The second transmission tank 20 is connected to the second chamber 332 of the first cylinder 33 and the fourth chamber 342 of the second cylinder 34 through pipelines, and the working fluid can be transmitted between the second transmission tank 20 and the second chamber 331 , and between the second transmission tank 20 and the fourth chamber 342 .

[0057] In some embodiments, Figure 1 As shown, each of the first transmission tank 10 and the second transmission tank 20 is connected to the fluid input pipe through a one-way valve 60 so that the upstream fluid can only flow into the transmission tank in one direction. Specifically, the first transmission tank 10 is connected to the fluid input pipe through the first one-way valve 61, and the second transmission tank 20 is connected to the fluid input pipe through the second one-way valve 62 to prevent fluid backflow.

[0058] Each of the first transmission tank 10 and the second transmission tank 20 is connected to the fluid output pipe through a one-way valve 60 so that the fluid can only flow out of the transmission tank to the downstream in one direction. Specifically, the first transmission tank 10 is connected to the fluid output pipe through the third one-way valve 63, and the second transmission tank 20 is connected to the fluid input pipe through the fourth one-way valve 64 to prevent the fluid from flowing backward.

[0059] In some embodiments, Figure 1As shown, when the hydraulically driven liquid piston delivery device 100 is working, in response to the hydraulic piston 40 moving away from the first cylinder 33 and approaching the second cylinder 34, the working liquid in the first transmission tank 10 flows into the first chamber 331 and the third chamber 341, and at the same time, the space at the top of the first transmission tank 10 increases to absorb the fluid, and the working liquid in the second chamber 332 and the fourth chamber 342 flows into the second transmission tank 20, and the working liquid in the second transmission tank 20 increases and the space at the top decreases, compressing or discharging the fluid. In response to the hydraulic piston 40 moving away from the second cylinder 34 and approaching the first cylinder 33, the working liquid in the second transmission tank 20 flows into the second chamber 332 and the fourth chamber 342, and at the same time, the space at the top of the second transmission tank 20 increases to absorb the fluid, and the working liquid in the first chamber 331 and the third chamber 341 flows into the first transmission tank 10, and the working liquid in the first transmission tank 10 increases and the space at the top decreases, compressing or discharging the fluid. In this way, the first transmission tank 10 and the second transmission tank 20 alternately deliver fluid.

[0060] In some embodiments, Figure 1 As shown, the hydraulic piston 40 includes a first hydraulic piston 41, and the first hydraulic piston 41 separates the first hydraulic chamber 311 and the second hydraulic chamber 312. The first piston 51 and the second piston 52 are respectively fixedly connected to the first hydraulic piston 41 through piston rods, and the three move together.

[0061] The following is a detailed introduction Figure 1 Specific working process of the hydraulically driven liquid piston fluid delivery device 100.

[0062] After the hydraulically driven liquid piston fluid delivery device 100 is started, the hydraulic station 32 injects high-pressure hydraulic oil into the first hydraulic chamber 311 of the hydraulic cylinder 31, pushing the first hydraulic piston 41 away from the first cylinder body 33 and closer to the second cylinder body 34. Figure 1The first hydraulic piston 41 pushes the low-pressure hydraulic oil in the second hydraulic chamber 34 to be recovered to the oil tank in the hydraulic station 32. The movement of the first hydraulic piston 41 drives the first piston 51 and the second piston 52 to move rightward synchronously. At this time, the working liquid in the first transmission tank 10 flows into the first chamber 331 and the third chamber 341 through the pipeline, the top space in the first transmission tank 10 increases, and the pressure decreases. When the pressure is lower than the fluid input pipe, the first check valve 61 opens, and the fluid, such as gas, liquid or gas-liquid mixture, is sucked into the first transmission tank 10, and the third check valve 63 is in a closed state; at the same time, the working liquid in the second chamber 332 and the fourth chamber 342 flows into the second transmission tank 20 through the pipeline, the top space in the second transmission tank 20 decreases, and the pressure increases. When the pressure is higher than the fluid output pipe, the fourth check valve 64 opens, and the fluid, such as gas, liquid or gas-liquid mixture, is pushed out of the second transmission tank 20 by the working liquid, and the second check valve 62 is in a closed state.

[0063] In some embodiments, when the synchronously moving piston assembly consisting of the first hydraulic piston 41, the first piston 51 and the second piston 52 moves to the rightmost end, the working fluid just fills the second transmission tank 20, and the fluid in the second transmission tank 20 is basically completely discharged.

[0064] Subsequently, the hydraulic reversing mechanism in the hydraulic station 32 reverses the hydraulic oil circuit and injects high-pressure hydraulic oil into the second hydraulic chamber 312 of the hydraulic cylinder 31, pushing the first hydraulic piston 41 away from the second cylinder body 34 and toward the first cylinder body 33. Figure 1 The first hydraulic piston 41 pushes the low-pressure hydraulic oil in the first hydraulic chamber 311 to be recovered to the oil tank in the hydraulic station 32. The movement of the first hydraulic piston 41 drives the first piston 51 and the second piston 52 to move to the left synchronously. At this time, the working fluid in the second transmission tank 20 flows into the second chamber 332 and the fourth chamber 342 through the pipeline, and the top space in the second transmission tank 20 increases and the pressure decreases. When the pressure is lower than the fluid input pipe, the second one-way valve 62 opens, and the fluid, such as gas, liquid or gas-liquid mixture, is sucked into the second transmission tank 20, and the fourth one-way valve 64 is in a closed state; at the same time, the working fluid in the first chamber 331 and the third chamber 341 flows into the first transmission tank 10 through the pipeline, and the top space in the first transmission tank 10 decreases and the pressure increases. When the pressure is higher than the fluid output pipe, the third one-way valve 63 opens, and the fluid, such as gas, liquid or gas-liquid mixture, is pushed out of the first transmission tank 10 by the working fluid, and the first one-way valve 61 is in a closed state.

[0065] In some embodiments, when the synchronously moving piston assembly consisting of the first hydraulic piston 41 , the first piston 51 and the second piston 52 moves to the leftmost end, the working fluid just fills the first transmission tank 10 , and the fluid in the first transmission tank 10 is basically completely discharged.

[0066] When the synchronously moving piston assembly composed of the first hydraulic piston 41, the first piston 51 and the second piston 52 moves synchronously to the left or right, it is necessary for the hydraulic station 32 to provide a sufficiently large power to satisfy the following formula:

[0067] P0×(S0-S0')>P1×(S1+S2-S2') or

[0068] P0×(S0-S0')>P1×(S1-S1'+S2)

[0069] Wherein P0 represents the pressure difference of the hydraulic oil in the first hydraulic chamber 311 and the second hydraulic chamber 312, S0 represents the piston area of ​​the first hydraulic piston 41, S0' represents the cross-sectional area of ​​the piston rod of the first hydraulic piston 41, P1 represents the pressure difference in the first transmission tank 10 and the second transmission pipe 20, S1 and S2 represent the piston areas of the first piston 51 and the second piston 52 respectively, and S1' and S2' represent the cross-sectional areas of the piston rods of the first piston 51 and the second piston 52 respectively.

[0070] In some embodiments, the first cylinder body 33 and the second cylinder body 34 are symmetrically designed relative to the hydraulic cylinder 31 , and the cross-sectional areas of the piston and the piston rod of the first piston 51 and the second piston 52 are the same.

[0071] The hydraulic station 32 provides sufficient power to satisfy the following formula:

[0072] It satisfies P0>P1×(2S1-S1') / (S0-S0').

[0073] By using the hydraulically driven liquid piston fluid delivery device 100 in the embodiment of the present disclosure, media with any gas-liquid ratio can be compressed and transmitted. The compression ratio can be very high and is almost unlimited, and can be applied to the fields of oil and gas collection and hydrogen energy. When the fluid entering the first transmission tank 10 or the second transmission tank 20 is all gas, the total liquid volume of the liquid piston working liquid remains unchanged. When the fluid entering the first transmission tank 10 or the second transmission tank 20 is liquid or a gas-liquid mixture, since the working volume of the hydraulic piston is certain, the sucked liquid will be discharged during the rising process of the liquid level in the transmission tank. The hydraulically driven liquid piston fluid delivery device 100 can transport media with any gas-liquid ratio of 0-100%. Figure 1 As shown, the hydraulically driven liquid piston fluid conveying device 100 installs the inlet and outlet check valves on the top of the transmission tank body, and the clearance volume is very small. At the same time, since the specific heat of liquid is much greater than that of gas, its exhaust temperature rise is also easier to control. With this structure, a very high compression ratio can be achieved in the first stage of compression, which is almost not limited by the compression ratio.

[0074] Figure 2The structure diagram of the hydraulically driven liquid piston fluid delivery device provided by some embodiments of the present disclosure is shown. Figure 2 The hydraulically driven liquid piston fluid delivery device shown in Figure 1 The structure of the hydraulically driven liquid piston fluid delivery device shown in is basically the same as Figure 2 As shown, some embodiments of the present disclosure also provide a hydraulically driven liquid piston fluid delivery device 100', which is Figure 1 The differences of the hydraulically driven liquid piston fluid delivery device 100 shown are as follows:

[0075] A first switch valve 71 is provided on the pipeline between the first transmission tank 10 and the third chamber 341, a second switch valve 72 is provided on the pipeline between the second transmission tank 20 and the second chamber 332, the second chamber 332 is connected to the third chamber 341 through a pipeline, and a third switch valve 73 is provided on the pipeline between the second chamber 332 and the third chamber 341.

[0076] When the first switch valve 71 and the second switch valve 72 are in the open state, and the third switch valve is in the closed state, Figure 2 The hydraulically driven liquid piston fluid delivery device 100' is shown with Figure 1 The hydraulically driven liquid piston fluid delivery device 100 shown in FIG. Its working principle is as described above and will not be repeated here.

[0077] At this time, as the fluid is transferred, the pressure at the fluid input pipe may become smaller and smaller, so that the hydraulic station 32 cannot drive the first hydraulic piston 41, causing the hydraulically driven liquid piston fluid delivery device 100' to fail to work properly. At this time, the first switch valve 71 and the second switch valve 72 can be switched from the open state to the closed state, and the third switch valve 73 can be switched from the closed state to the open state. Figure 2 The hydraulically driven liquid piston fluid delivery device 100 ′ is equivalent to Figure 3 The hydraulically driven liquid piston fluid delivery device 100" is shown.

[0078] Figure 3 FIG. 1 shows a schematic diagram of a structure of a hydraulically driven liquid piston fluid delivery device provided in some embodiments of the present disclosure, such as Figure 3 As shown, the hydraulically driven liquid piston fluid delivery device 100" and Figure 1 The structures of the hydraulically driven liquid piston fluid delivery devices are basically the same, with the following differences:

[0079] The first transmission tank 10 is connected to the first chamber 331 of the first cylinder 33 through a pipeline, and the working fluid can be transferred between the first transmission tank 10 and the first chamber 331. The second transmission tank 20 is connected to the fourth chamber 342 of the second cylinder 33 through a pipeline, and the working fluid can be transferred between the second transmission tank 20 and the fourth chamber 342. The second chamber 332 of the first cylinder 33 is connected to the third chamber 341 of the second cylinder 34, and the working fluid can be transferred between the second chamber 332 and the third chamber 341.

[0080] The following is a detailed introduction Figure 3 The specific working process of the hydraulically driven liquid piston fluid delivery device 100 is shown in FIG.

[0081] The hydraulic station 32 injects high-pressure hydraulic oil into the first hydraulic chamber 311 of the hydraulic cylinder 31, pushing the first hydraulic piston 41 away from the first cylinder body 33 and toward the second cylinder body 34. Figure 3 The first hydraulic piston 41 pushes the low-pressure hydraulic oil in the second hydraulic chamber 312 to be recovered to the oil tank in the hydraulic station 32. The movement of the first hydraulic piston 41 drives the first piston 51 and the second piston 52 to move to the right synchronously. At this time, the working liquid in the first transmission tank 10 flows into the first chamber 331 through the pipeline, the top space in the first transmission tank 10 increases, and the pressure decreases. When the pressure is lower than the fluid input pipe, the first check valve 61 opens, and the fluid, such as gas, liquid or gas-liquid mixture, is sucked into the first transmission tank 10, and the third check valve 63 is in a closed state; at the same time, the working liquid in the fourth chamber 342 flows into the second transmission tank 20 through the pipeline, the top space in the second transmission tank 20 decreases, and the pressure increases. When the pressure is higher than the fluid output pipe, the fourth check valve 64 opens, and the fluid, such as gas, liquid or gas-liquid mixture, is pushed out of the second transmission tank 20 by the working liquid, and the second check valve 62 is in a closed state. In this process, the working liquid in the second chamber 332 flows into the third chamber 341.

[0082] In some embodiments, when the synchronously moving piston assembly consisting of the first hydraulic piston 41, the first piston 51 and the second piston 52 moves to the rightmost end, the working fluid just fills the second transmission tank 20, and the fluid in the second transmission tank 20 is basically completely discharged.

[0083] Subsequently, the reversing mechanism in the hydraulic station 32 reverses the hydraulic oil circuit and injects high-pressure hydraulic oil into the second hydraulic chamber 312 of the hydraulic cylinder 31, pushing the first hydraulic piston 41 away from the second cylinder body 34 and toward the first cylinder body 33. Figure 1The first hydraulic piston 41 pushes the low-pressure hydraulic oil in the first hydraulic chamber 311 to be recovered to the oil tank in the hydraulic station 32. The movement of the first hydraulic piston 41 drives the first piston 51 and the second piston 52 to move to the left synchronously. At this time, the working fluid in the second transmission tank 20 flows into the fourth chamber 342 through the pipeline, the top space in the second transmission tank 20 increases and the pressure decreases. When the pressure is lower than the fluid input pipe, the second one-way valve 62 opens, and the fluid, such as gas, liquid or gas-liquid mixture, is sucked into the second transmission tank 20, and the fourth one-way valve 64 is in a closed state; at the same time, the working fluid in the first chamber 331 flows into the first transmission tank 10 through the pipeline, the top space in the first transmission tank 10 decreases, and the pressure increases. When the pressure is higher than the fluid output pipe, the third one-way valve 63 opens, and the fluid, such as gas, liquid or gas-liquid mixture, is pushed out of the first transmission tank 10 by the working fluid, and the first one-way valve 61 is in a closed state. In this process, the working fluid in the third chamber 341 flows into the second chamber 332.

[0084] In some embodiments, when the synchronously moving piston assembly consisting of the first hydraulic piston 41 , the first piston 51 and the second piston 52 moves to the leftmost end, the working fluid just fills the first transmission tank 10 , and the fluid in the first transmission tank 10 is basically completely discharged.

[0085] When the synchronously moving piston assembly composed of the first hydraulic piston 41, the first piston 51 and the second piston 52 moves synchronously to the left or right, it is necessary for the hydraulic station 32 to provide a sufficiently large power to satisfy the following formula:

[0086] P0>P1×S1 / (S0-S0')

[0087] Wherein P0 represents the pressure difference between the hydraulic oil in the first hydraulic chamber 311 and the second hydraulic chamber 312, S0 represents the piston area of ​​the first hydraulic piston 41, S0' represents the cross-sectional area of ​​the piston rod of the first hydraulic piston 41, P1 represents the pressure difference between the first transmission tank 10 and the second transmission pipe 20, and S1 represents the piston area of ​​the first piston 51 and the second piston 52.

[0088] Figure 3 The hydraulically driven liquid piston fluid delivery device 100" shown is compared to Figure 1 The hydraulically driven liquid piston fluid delivery device 100 shown in the figure can achieve fluid delivery with a higher pressure difference when the power provided by the hydraulic station 32 is the same, but the delivery volume will be reduced. Two working modes, large flow and small pressure difference and small flow and large pressure difference, can be achieved by valve switching to meet a wide range of application requirements.

[0089] Figure 2The hydraulically driven liquid piston fluid delivery device 100' shown can be Figure 1 The working state of the hydraulically driven liquid piston fluid delivery device 100 is shown as well as Figure 3 The hydraulically driven liquid piston fluid delivery device 100" shown in the figure switches between the working states. For example, in the field of oil and gas production increase, at the initial stage of operation, the air pressure difference between the fluid input pipe and the fluid output pipe is relatively low. The hydraulically driven liquid piston fluid delivery device 100' can open the first switch valve 71 and the second switch valve 72, and close the third switch valve 73. The first cylinder 33 and the second cylinder 34 both work in double chambers. The air pressure difference between the fluid input pipe and the fluid output pipe gradually increases. When the air pressure of the fluid input pipe is significantly lower than the air pressure of the fluid output pipe, the hydraulic station 33 may be unable to drive the hydraulic piston. At this time, the first switch valve 71 and the second switch valve 72 can be closed, and the third switch valve 73 can be opened to achieve single-chamber operation of the first cylinder 33 and the second cylinder 34, thereby achieving continuous operation under higher pressure difference conditions.

[0090] Figure 4 The structure diagram of the hydraulically driven liquid piston fluid delivery device provided in some embodiments of the present disclosure is shown. Figure 4 The hydraulically driven liquid piston fluid delivery device shown in Figure 1 The structure of the hydraulically driven liquid piston fluid delivery device shown in is basically the same as Figure 4 As shown, some embodiments of the present disclosure also provide a hydraulically driven liquid piston fluid delivery device 200, which is Figure 1 The differences of the hydraulically driven liquid piston fluid delivery device 100 shown are as follows:

[0091] The hydraulic cylinder 31 further includes a first isolation chamber 313 and a second isolation chamber 314. The first isolation chamber 313 is disposed on the side of the first hydraulic chamber 311 close to the first cylinder body 33; the second isolation chamber 314 is disposed on the side of the second hydraulic chamber 312 close to the second cylinder body 34.

[0092] The hydraulic cylinder 31 is provided with a partition wall 80, and the partition wall 80 separates the first hydraulic chamber 311 from the second hydraulic chamber 312. The hydraulic piston 40 includes a second hydraulic piston 42 and a third hydraulic piston 43 fixedly connected by a piston rod, the second hydraulic piston 42 separates the first isolation chamber 313 from the first hydraulic chamber 311, and the third hydraulic piston 43 separates the second isolation chamber 314 from the second hydraulic chamber 312.

[0093] The following is a detailed introduction Figure 4 The specific working process of the hydraulically driven liquid piston fluid delivery device 200.

[0094] After the hydraulically driven liquid piston fluid delivery device 200 is started, the hydraulic station 32 injects high-pressure hydraulic oil into the first hydraulic chamber 311 of the hydraulic cylinder 31, pushing the second hydraulic piston 42 to move closer to the first cylinder body 33 and away from the second cylinder body 34. Figure 4 The second hydraulic piston 42 drives the third hydraulic piston 43, the first piston 51 and the second piston 52 to move to the left synchronously, and the third hydraulic piston 43 pushes the low-pressure hydraulic oil in the second hydraulic chamber 34 to be recovered to the hydraulic oil tank of the hydraulic station 32. At this time, the working fluid in the second transmission tank 20 flows into the second chamber 322 and the fourth chamber 342 through the pipeline, and the top space in the second transmission tank 20 increases and the pressure decreases. When the pressure is lower than the fluid input pipe, the second check valve 62 opens, and the fluid, such as gas, liquid or gas-liquid mixture, is sucked into the second transmission tank 20, and the fourth check valve 64 is in a closed state; at the same time, the working fluid in the first chamber 331 and the third chamber 341 flows into the first transmission tank 10 through the pipeline, and the top space in the first transmission tank 10 decreases and the pressure increases. When the pressure is higher than the fluid output pipe, the third check valve 63 opens, and the fluid, such as gas, liquid or gas-liquid mixture, is pushed out of the first transmission tank 10 by the working fluid, and the first check valve 61 is in a closed state.

[0095] In some embodiments, when the synchronously moving piston assembly consisting of the second hydraulic piston 42, the third hydraulic piston 43, the first piston 51 and the second piston 52 moves to the leftmost end, the working fluid just fills the first transmission tank 10, and the fluid in the first transmission tank 10 is basically completely discharged.

[0096] Subsequently, the hydraulic station 32 injects high-pressure hydraulic oil into the second hydraulic chamber 312 of the hydraulic cylinder 31, pushing the third hydraulic piston 43 to move closer to the second cylinder body 34 and away from the first cylinder body 33. Figure 4 The third hydraulic piston 43 drives the second hydraulic piston 42, the first piston 51 and the second piston 52 to move rightward synchronously, and the second hydraulic piston 42 pushes the low-pressure hydraulic oil in the first hydraulic chamber 311 to be recovered to the hydraulic station 32. At this time, the working fluid in the first transmission tank 10 flows into the first chamber 321 and the third chamber 341 through the pipeline, and the top space in the first transmission tank 10 increases and the pressure decreases. When the pressure is lower than the fluid input pipe, the first check valve 61 is opened, and the fluid such as gas, liquid or gas-liquid mixture is sucked into the first transmission tank 10, and the third check valve 63 is in a closed state; at the same time, the working fluid in the second chamber 332 and the fourth chamber 342 flows into the second transmission tank 20 through the pipeline, and the top space in the second transmission tank 20 decreases and the pressure increases. When the pressure is higher than the fluid output pipe, the fourth check valve 64 is opened, and the fluid such as gas, liquid or gas-liquid mixture is pushed out of the second transmission tank 20 by the working fluid, and the third check valve 63 is in a closed state.

[0097] In some embodiments, when the synchronously moving piston assembly consisting of the second hydraulic piston 42, the third hydraulic piston 43, the first piston 51 and the second piston 52 moves to the rightmost end, the working fluid just fills the second transmission tank 20, and the fluid in the second transmission tank 20 is basically completely discharged.

[0098] During the movement of the piston assembly composed of the second hydraulic piston 42, the third hydraulic piston 43, the first piston 51 and the second piston 52 driven by the hydraulic station 32, the same contamination with the hydraulic oil and the working fluid can be avoided due to the provision of the first isolation chamber 313 and the second isolation chamber 314. Specifically, the part of the piston rod in contact with the working fluid will not contact the hydraulic oil, and the part of the piston rod in contact with the hydraulic oil will not contact the working fluid.

[0099] For example, in the field of high-purity gas compression, non-volatile liquids such as ionic liquids can be used as working fluids. This structure can prevent hydraulic oil from mixing with ionic liquids, thereby ensuring the purity of the compressed gas.

[0100] In some embodiments, Figure 4 The hydraulically driven liquid piston fluid delivery device 200 shown can also be referred to as Figure 2 The hydraulically driven liquid piston fluid delivery device 100' and / or Figure 3 The hydraulically driven liquid piston fluid delivery device 100" is relative to Figure 1 The modified example of the hydraulically driven liquid piston fluid delivery device 100 is modified accordingly and will not be repeated again.

[0101] Figure 5 The structure diagram of the hydraulically driven liquid piston fluid delivery device provided in some embodiments of the present disclosure is shown. Figure 5 The hydraulically driven liquid piston fluid delivery device shown in Figure 1 The structure of the hydraulically driven liquid piston fluid delivery device shown in is basically the same as Figure 5 As shown, some embodiments of the present disclosure also provide a hydraulically driven liquid piston fluid delivery device 300, which is Figure 1 The differences of the hydraulically driven liquid piston fluid delivery device 100 shown are as follows:

[0102] The pipeline for transmitting the working fluid connected to the first transmission tank 10 and / or the second transmission tank 20 is provided with a cooler 90. Specifically, the cooler 90 is arranged below the first transmission tank 10 and / or the second transmission tank 20, so as to reduce the temperature of the working fluid, absorb the compression heat, and reduce the temperature of the exhaust fluid.

[0103] It will be appreciated by those skilled in the art that the design of the cooler can also be applied to Figures 2 to 4 The embodiments and their variations. Figure 6The structure diagram of the hydraulically driven liquid piston fluid delivery device provided in some embodiments of the present disclosure is shown. Figure 6 shows the design of the cooler for use in Figure 2 and Figure 4 A hydraulically driven liquid piston fluid delivery device 400 according to a modified example of the combination.

[0104] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. For the system or device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0105] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A hydraulically driven liquid piston fluid delivery device, characterized in that: include: A first transmission tank and a second transmission tank are provided with suction and discharge check valves on the top, and are configured to alternately suck in fluid and discharge fluid; The liquid piston driving device is hydraulically driven and is connected to the first transmission tank and the second transmission tank. It is configured to press the working liquid into one of the first transmission tank and the second transmission tank so that the one of the first transmission tank and the second transmission tank discharges the fluid, and at the same time, draw the working liquid out of the other of the first transmission tank and the second transmission tank so that the other of the first transmission tank and the second transmission tank inhales the fluid.

2. The hydraulically driven liquid piston fluid delivery device according to claim 1, wherein: The liquid piston drive device comprises: The hydraulic cylinder comprises a first hydraulic chamber and a second hydraulic chamber, wherein the first hydraulic chamber and the second hydraulic chamber are filled with hydraulic oil, and a hydraulic piston is arranged inside the hydraulic cylinder; a hydraulic station, which is in communication with the hydraulic cylinder and includes a hydraulic pump and a hydraulic oil reversing mechanism, wherein the hydraulic oil cooperates with the hydraulic oil reversing mechanism to alternately inject hydraulic oil into the first hydraulic chamber and the second hydraulic chamber, so that the volumes of the first hydraulic chamber and the second hydraulic chamber are alternately increased or decreased and the hydraulic piston is driven by the hydraulic oil to reciprocate in the hydraulic cylinder; and The first cylinder body and the second cylinder body are respectively arranged on both sides of the hydraulic cylinder. The interior of the first cylinder body is divided into a first chamber and a second chamber by a first piston. The interior of the second cylinder body is divided into a third chamber and a fourth chamber by a second piston. The first chamber, the second chamber, the third chamber and the fourth chamber are filled with working fluid. The first piston and the second piston are fixedly connected to the hydraulic piston through piston rods, respectively, and each of the first transmission tank and the second transmission tank is connected to at least one chamber in any one of the first cylinder body and the second cylinder body.

3. The hydraulically driven liquid piston fluid delivery device according to claim 1 or 2, characterized in that: Each of the first transmission tank and the second transmission tank is connected to the fluid input pipe through a one-way valve so that the upstream fluid can only flow into the transmission tank in one direction; each of the first transmission tank and the second transmission tank is connected to the fluid output pipe through a one-way valve so that the fluid can only flow out of the transmission tank to the downstream in one direction.

4. The hydraulically driven liquid piston fluid delivery device according to claim 2, characterized in that: In response to the hydraulic piston moving away from the first cylinder and approaching the second cylinder, the working fluid in the first transmission tank flows out, sucking in fluid, and the working fluid in the second transmission tank increases, discharging fluid; In response to the hydraulic piston moving away from the second cylinder and approaching the first cylinder, the working fluid in the second transmission tank flows out, sucking in fluid, and the working fluid in the first transmission tank increases, discharging fluid.

5. The hydraulically driven liquid piston fluid delivery device according to claim 2, characterized in that: The first transmission tank is connected with the first chamber and the third chamber through a pipeline; The second transmission tank is communicated with the second chamber and the fourth chamber through a pipeline.

6. The hydraulically driven liquid piston fluid delivery device according to claim 5, characterized in that: A first switch valve is provided on the pipeline between the first transmission tank and the third chamber, and a second switch valve is provided on the pipeline between the second transmission tank and the second chamber. The second chamber is connected to the third chamber through a pipeline, and a third switch valve is arranged on the pipeline between the second chamber and the third chamber. When the first switch valve and the second switch valve are opened and the third switch valve is closed, the first transmission tank is connected to the first chamber and the third chamber, and the second transmission tank is connected to the second chamber and the fourth chamber. When the first switch valve and the second switch valve are closed and the third switch valve is opened, the first transmission tank is connected only to the first chamber, the second transmission tank is connected only to the fourth chamber, and the second chamber is connected to the third chamber.

7. The hydraulically driven liquid piston fluid delivery device according to claim 2, characterized in that: The hydraulic piston includes a first hydraulic piston that separates the first hydraulic chamber and a second hydraulic chamber.

8. The hydraulically driven liquid piston fluid delivery device according to claim 2, characterized in that: The hydraulic cylinder comprises: A first isolation chamber is arranged on a side of the first hydraulic chamber close to the first cylinder body; The second isolation chamber is arranged on a side of the second hydraulic chamber close to the second cylinder body.

9. The hydraulically driven liquid piston fluid delivery device according to claim 8, characterized in that: The hydraulic cylinder is provided with a partition wall, the partition wall separating the first hydraulic chamber and the second hydraulic chamber, The hydraulic piston comprises a second hydraulic piston and a third hydraulic piston fixedly connected by a piston rod, the second hydraulic piston separates the first isolation chamber and the first hydraulic chamber, and the third hydraulic piston separates the second isolation chamber and the second hydraulic chamber.

10. The hydraulically driven liquid piston fluid delivery device according to claim 1 or 2, characterized in that: The pipeline for transmitting the working fluid and communicating with the first transmission tank or the second transmission tank is provided with a cooler.

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