阅读说明：本技术 一种两级活塞式气体压缩装置 (Two-stage piston type gas compression device ) 是由 张梦俭 张爱国 张明俊 郑铭路 刘晓禹 于 2021-02-03 设计创作，主要内容包括：本发明公开了一种两级活塞式气体压缩装置,包括：气体压缩工作缸、活塞杆、液压油缸、三位四通换向阀、油泵、油箱、液体管道和离子液体增压缸；液压油缸、离子液体增压缸和气体压缩工作缸从下往上顺序布置,液压油缸和离子液体增压缸之间通过活塞杆连接,离子液体增压缸通过液体管道与气体压缩工作缸连通；活塞杆两端分别设有活塞,且两端活塞的大小不同,大端活塞与液压油缸配合并将其分为液压油缸上腔和液压油缸下腔,且液压油缸上腔通过回油管路与油箱连通,小端活塞与离子液体增压缸配合并将其分为上腔和下腔,且上腔中充满离子液体,下腔中充满气体；油泵设置在油箱中,并通过三位四通换向阀向液压油缸下腔提供压力油液。(The invention discloses a two-stage piston type gas compression device, which comprises: the device comprises a gas compression working cylinder, a piston rod, a hydraulic oil cylinder, a three-position four-way reversing valve, an oil pump, an oil tank, a liquid pipeline and an ionic liquid pressure cylinder; the ionic liquid pressurizing cylinder is communicated with the gas compression working cylinder through a liquid pipeline; the two ends of the piston rod are respectively provided with a piston, the pistons at the two ends are different in size, the large-end piston is matched with the hydraulic oil cylinder and divides the hydraulic oil cylinder into a hydraulic oil cylinder upper cavity and a hydraulic oil cylinder lower cavity, the hydraulic oil cylinder upper cavity is communicated with an oil tank through an oil return pipeline, the small-end piston is matched with the ionic liquid pressure cylinder and divides the ionic liquid pressure cylinder into an upper cavity and a lower cavity, the upper cavity is filled with ionic liquid, and the lower cavity is filled; the oil pump is arranged in the oil tank and provides pressure oil for the lower cavity of the hydraulic oil cylinder through the three-position four-way reversing valve.)

1. A two-stage piston gas compression device comprising: the device comprises a gas compression working cylinder (5), a piston rod (7), a hydraulic oil cylinder (8), a three-position four-way reversing valve (9), an oil pump (11), an oil tank (13), a liquid pipeline (16) and an ionic liquid pressure cylinder (19);

the hydraulic oil cylinder (8), the ionic liquid pressure cylinder (19) and the gas compression working cylinder (5) are sequentially arranged from bottom to top, the hydraulic oil cylinder (8) and the ionic liquid pressure cylinder (19) are connected through a piston rod (7), and the ionic liquid pressure cylinder (19) is communicated with the gas compression working cylinder (5) through a liquid pipeline (16); the gas compression working cylinder (5) is filled with gas, the hydraulic oil cylinder (8) is filled with oil (17), pistons are arranged at two ends of a piston rod (7) respectively, the pistons at the two ends are different in size, a large-end piston is matched with the hydraulic oil cylinder (8) and divides the hydraulic oil cylinder into a hydraulic oil cylinder upper cavity (15) and a hydraulic oil cylinder lower cavity (14), the hydraulic oil cylinder upper cavity (15) is communicated with an oil tank (13) through an oil return pipeline, a small-end piston is matched with an ionic liquid pressurizing cylinder (19) and divides the ionic liquid pressurizing cylinder into an upper cavity and a lower cavity, the upper cavity is filled with ionic liquid (18), and the lower cavity is;

the oil pump (11) is arranged in an oil tank (13) and provides pressure oil liquid for a lower cavity (14) of the hydraulic oil cylinder through a three-position four-way reversing valve (9).

2. A two-stage piston gas compressor as claimed in claim 1, wherein the three-position four-way directional valve (9) has four ports, i.e. port a, port B, port P and port O, each of the ports a and B represents an oil inlet to the hydraulic cylinder (8), each of the ports P and O represents an oil inlet and an oil return, the port a of the three-position four-way directional valve (9) is connected to the lower chamber (14) of the hydraulic cylinder via a pipe, the port B is connected to the upper chamber (15) of the hydraulic cylinder via a hydraulic oil pipe (12), the port P is connected to the oil pump (11) via a pipe, the port O is connected to the oil tank (13) via a pipe, the oil tank (13), the oil pump (11), the port P of the four-way three-position directional valve (9), the port a and the lower chamber (14) of the hydraulic cylinder are connected to oil inlet pipes, the upper chamber (15) of the hydraulic cylinder and the port B of the three, And a pipeline communicated with the O port and the oil tank (13) is an oil return pipeline.

3. A two-stage piston gas compression arrangement as claimed in claim 2, further comprising: one end of the overflow valve (10) is arranged between a P port of the three-position four-way reversing valve (9) and the oil pump (11), and the other end of the overflow valve (10) is connected into the oil tank (13).

4. A two-stage piston gas compression arrangement as claimed in claim 1, characterised in that the upper end of the upper chamber of the ionic liquid charging cylinder (19) is provided with an ionic liquid inlet conduit (1) and an ionic liquid outlet conduit (4) at a set distance from the top for feeding cooled ionic liquid (18) and discharging compressed ionic liquid (18), respectively.

5. A two-stage piston gas compression arrangement according to claim 4, characterised in that the ionic liquid inlet conduit (1) and the ionic liquid outlet conduit (4) are at a higher level on the ionic liquid pressurisation cylinder (19) than the limit level that the piston rod (7) can reach to push the ionic liquid (18) in the ionic liquid pressurisation cylinder (19).

6. A two-stage piston gas compression arrangement as claimed in claim 1, characterised in that the gas compression cylinder (5) is provided with a low pressure gas duct (2) and a high pressure gas duct (3) at the top for feeding low pressure gas to the gas compression cylinder (5) and for discharging compressed gas.

7. A two-stage piston gas compression arrangement as claimed in claim 1 in which the difference in volume between the hydraulic ram (8) and the ionic liquid pressurisation cylinder (19) is such as to enable the side of the ionic liquid pressurisation cylinder (19) to be brought to a higher pressure whilst providing a lower pressure on the side of the hydraulic ram (8).

8. A two-stage piston gas compression arrangement according to claim 7 in which the hydraulic ram (8) and the ionic liquid pressurisation cylinder (19) are both cylindrical and the internal diameter of the hydraulic ram (8) is greater than the internal diameter of the ionic liquid pressurisation cylinder (19).

9. A two-stage piston gas compression arrangement as claimed in claim 1, in which the gas in the lower chamber of the ionic liquid booster cylinder (19) is air.

10. A two-stage piston gas compression arrangement according to claim 1, characterised in that the gas in the gas compression cylinder (5) is hydrogen.

Technical Field

The invention relates to the technical field of liquid pistons, in particular to a two-stage piston type gas compression device.

Background

Energy storage technology has been considered as an important component in the operation of a hydroprocessing station. However, compressed gas energy storage has certain limitations, and the main disadvantages of compressed gas energy storage are that when compressed gas is matched with a gas turbine, gas is consumed, environmental pollution is caused, leakage is easy, energy density is low, and during gas compression and expansion, temperature change is severe, damage to equipment is large, and maintenance cost is high.

In recent years, the application of liquid pistons in compressed gas energy storage has been studied to solve the problem of environmental pollution caused by compressed gas energy storage, but in the compressor designs considered in the prior art, the direct use of liquid by the system may require a complex and specially designed hydraulic system or a specially designed specific liquid, which would increase the considerable production cost of the compressor. Therefore, it is not preferable.

Disclosure of Invention

In view of the above, the present invention provides a two-stage piston type gas compression device, which can avoid direct contact between liquid and a hydraulic system and allow the use of commercial ionic liquid and the hydraulic system, and reduce the total cost of hydrogen storage, aiming at the problem that the direct contact between the liquid and the hydraulic system increases the considerable production cost of the compressor.

The technical scheme of the invention is as follows: a two-stage piston gas compression device comprising: the device comprises a gas compression working cylinder, a piston rod, a hydraulic oil cylinder, a three-position four-way reversing valve, an oil pump, an oil tank, a liquid pipeline and an ionic liquid pressure cylinder;

the hydraulic oil cylinder, the ionic liquid pressure cylinder and the gas compression working cylinder are sequentially arranged from bottom to top, the hydraulic oil cylinder and the ionic liquid pressure cylinder are connected through a piston rod, and the ionic liquid pressure cylinder is communicated with the gas compression working cylinder through a liquid pipeline; the gas compression working cylinder is filled with gas, the hydraulic oil cylinder is filled with oil, pistons are arranged at two ends of the piston rod respectively, the pistons at two ends are different in size, the large-end piston is matched with the hydraulic oil cylinder and divides the large-end piston into a hydraulic oil cylinder upper cavity and a hydraulic oil cylinder lower cavity, the hydraulic oil cylinder upper cavity is communicated with the oil tank through an oil return pipeline, the small-end piston is matched with the ionic liquid pressure cylinder and divides the ionic liquid pressure cylinder into an upper cavity and a lower cavity, the upper cavity is filled with ionic liquid, and the lower cavity;

the oil pump is arranged in the oil tank and provides pressure oil for the lower cavity of the hydraulic oil cylinder through the three-position four-way reversing valve.

Preferably, four pipe orifices of the three-position four-way reversing valve are respectively an opening A, an opening B, an opening P and an opening O, the opening A and the opening B both represent oil through openings connected to a hydraulic oil cylinder, the opening P and the opening O both represent an oil inlet and an oil return opening, the opening A of the three-position four-way reversing valve is communicated with a lower cavity of the hydraulic oil cylinder through a pipeline, the opening B is communicated with an upper cavity of the hydraulic oil cylinder through a hydraulic oil pipeline, the opening P is connected with an oil pump through a pipeline, the opening O is communicated with the oil tank through a pipeline, the pipeline through which the oil tank, the oil pump, the opening P, the opening A of the three-position four-way reversing valve and the lower cavity of the hydraulic oil cylinder are communicated is an oil inlet pipeline, and the pipeline through.

Preferably, the method further comprises the following steps: and one end of the overflow valve is arranged between the P port of the three-position four-way reversing valve and the oil pump, and the other end of the overflow valve is connected into the oil tank.

Preferably, an ionic liquid inlet pipeline and an ionic liquid outlet pipeline are arranged at a position, away from a set top position, of the upper end of the upper cavity of the ionic liquid pressure cylinder, and are respectively used for inputting the cooled ionic liquid and outputting the compressed ionic liquid.

Preferably, the height of the ionic liquid inlet pipeline and the ionic liquid outlet pipeline on the ionic liquid pressure boosting cylinder is higher than the limit height which can be reached by the piston rod pushing the ionic liquid in the ionic liquid pressure boosting cylinder.

Preferably, the top of the gas compression working cylinder is provided with a low-pressure gas pipeline and a high-pressure gas pipeline respectively, and the low-pressure gas pipeline and the high-pressure gas pipeline are used for inputting low-pressure gas into the gas compression working cylinder and discharging compressed gas.

Preferably, the volume difference between the hydraulic oil cylinder and the ionic liquid pressure cylinder can ensure that the side of the ionic liquid pressure cylinder can reach a higher pressure when the side of the hydraulic oil cylinder provides a lower pressure.

Preferably, the hydraulic oil cylinder and the ionic liquid pressure cylinder are both cylindrical, and the inner diameter of the hydraulic oil cylinder is larger than that of the ionic liquid pressure cylinder.

Preferably, the gas in the lower cavity of the ionic liquid pressure cylinder is air.

Preferably, the gas in the gas compression cylinder is hydrogen.

Has the advantages that:

1. the gas compression device improves the traditional compressed gas temperature control technology, compresses gas by taking liquid as a medium, reduces the leakage problem in the gas compression process, and can cool the inside of the device.

2. The gas compression device disclosed by the invention completely isolates the hydraulic oil from the compressed gas through the ionic liquid, can effectively ensure that the compressed gas is not polluted, and has great advantages particularly in the application of a fuel cell.

3. The arrangement of the overflow valve can effectively prevent the over-high pressure of the whole gas compression device.

4. The gas compression device of the present invention minimizes the volume of ionic liquid used, avoiding the problem that the direct use of liquid to compress gas may require complex and specially designed hydraulic systems or specially designed specific liquids, both of which would result in a significant increase in the production costs of the compressor.

5. The gas compression device of the invention allows the use of commercial ionic liquid and hydraulic system, and can avoid the direct contact of the ionic liquid and the hydraulic system, thereby effectively reducing the total cost of compressing hydrogen and storing hydrogen.

Drawings

Fig. 1 is a schematic structural view of a two-stage piston type gas compression device of the present invention.

Wherein, 1-ionic liquid inlet pipeline; 2-low pressure gas pipeline; 3-high pressure gas pipeline; 4-an ionic liquid outlet conduit; 5-gas compression working cylinder; 6-compressing the working chamber; 7-a piston rod; 8-a hydraulic oil cylinder; 9-a three-position four-way reversing valve; 10-relief valves; 11-an oil pump; 12-hydraulic oil piping; 13-oil tank; 14-a lower cavity of the hydraulic oil cylinder; 15-upper chamber of hydraulic oil cylinder; 16-a liquid conduit; 17-oil liquid; 18-an ionic liquid; 19-ionic liquid pressurized cylinder; 20-ionic liquid plunger.

Detailed Description

The invention is described in detail below by way of example with reference to the accompanying drawings.

This embodiment provides a two-stage piston gas compression device that avoids direct liquid contact with the hydraulic system and allows the use of commercial ionic liquids and hydraulic systems, reducing the overall cost of hydrogen storage.

As shown in fig. 1, the apparatus includes: the device comprises a gas compression working cylinder 5, a piston rod 7, a hydraulic oil cylinder 8, a three-position four-way reversing valve 9, an overflow valve 10, an oil pump 11, a hydraulic oil pipeline 12, an oil tank 13, a liquid pipeline 16, oil 17, ionic liquid 18 and an ionic liquid pressure cylinder 19;

the connection relationship of the device is as follows: the hydraulic oil cylinder 8, the ionic liquid pressure cylinder 19 and the gas compression working cylinder 5 are sequentially arranged from bottom to top, the hydraulic oil cylinder 8 is connected with the ionic liquid pressure cylinder 19 through a piston rod 7 (two ends of the piston rod 7 are respectively provided with a piston and are respectively matched with the inner wall surfaces of the hydraulic oil cylinder 8 and the ionic liquid pressure cylinder 19), and the top of the ionic liquid pressure cylinder 19 is communicated with the bottom of the gas compression working cylinder 5 through a liquid pipeline 16; wherein, the hydraulic cylinder 8 is filled with oil liquid 17, the pistons at the two ends of the piston rod 7 are different in size, the large-end piston divides the hydraulic cylinder 8 into a hydraulic cylinder upper chamber 15 and a hydraulic cylinder lower chamber 14, the small-end piston divides the ionic liquid pressure cylinder 19 into an upper chamber and a lower chamber, the upper chamber is filled with ionic liquid 18, the lower chamber is filled with gas (such as air), the piston rod 7 moves upwards to transfer hydraulic power from the side of the hydraulic cylinder 8 to the side of the ionic liquid pressure cylinder 19, then the ionic liquid 18 in the upper chamber of the ionic liquid pressure cylinder 19 is compressed, so that part of the ionic liquid 18 is pushed into the lower chamber of the gas compression working cylinder 5 from the upper chamber of the ionic liquid pressure cylinder 19 to serve as an ionic liquid plunger 20, the ionic liquid plunger 20 can compress the gas in the upper chamber (compression working chamber 6) of the gas compression working cylinder 5 (the gas is insoluble, such as hydrogen), when the gas pressure in the upper chamber of the gas compression working cylinder 5 reaches a preset value, the gas is discharged through a high-pressure gas pipeline 3 arranged at the top of the gas compression working cylinder 5; wherein, the top of the gas compression working cylinder 5 is also provided with a low-pressure gas pipeline 2 for inputting a proper amount of low-pressure gas; an ionic liquid inlet pipeline 1 and an ionic liquid outlet pipeline 4 are arranged at a position, away from a set top position, of the upper end of an upper cavity of the ionic liquid pressure cylinder 19 and are respectively used for inputting cooled ionic liquid 18 and outputting compressed ionic liquid 18; the hydraulic oil cylinder upper cavity 15 can return oil 17 to the oil tank 13 through an oil return pipeline in the compression process;

the oil pump 11 is arranged in an oil tank 13, provides pressure oil for a lower cavity 14 of the hydraulic oil cylinder through the three-position four-way reversing valve 9, and when a piston of a piston rod 7 in the hydraulic oil cylinder 8 moves upwards in the hydraulic oil cylinder 8, the piston of the piston rod 7 in the ionic liquid pressurizing cylinder 19 is linked, so that the ionic liquid is pushed into the gas compression working cylinder 5 through a liquid pipeline 16, and the gas in the gas compression working cylinder 5 is compressed; the four pipe orifices of the three-position four-way reversing valve 9 are respectively an opening A, an opening B, an opening P and an opening O, the opening A and the opening B are both used for indicating an oil through opening connected to a hydraulic oil cylinder 8, the opening P and the opening O are both used for indicating an oil inlet and an oil return opening, the opening A of the three-position four-way reversing valve 9 is communicated with a lower cavity 14 of the hydraulic oil cylinder through a pipeline, the opening B is communicated with an upper cavity 15 of the hydraulic oil cylinder through a hydraulic oil pipeline 12, the opening P is connected with an oil pump 11 through a pipeline, the opening O is communicated with an oil tank 13 through a pipeline, the pipeline through which the oil tank 13, the oil pump 11, the opening P, the opening A and the lower cavity 14 of the hydraulic oil cylinder are communicated is an oil inlet pipeline, and the pipeline through which the opening B;

the overflow valve 10 is positioned on a bypass of the oil pump 11, namely one end of the overflow valve 10 is arranged between the P port of the three-position four-way reversing valve 9 and the oil pump 11, and the other end of the overflow valve is connected to the oil tank 13 and is used for preventing the overall pressure of the gas compression device from being too high;

in the embodiment, the hydraulic oil cylinder 8 and the ionic liquid pressure cylinder 19 are both cylindrical, the inner diameter of the hydraulic oil cylinder 8 is larger than that of the ionic liquid pressure cylinder 19, and the volume difference between the two can ensure that the side of the ionic liquid pressure cylinder 19 can reach a higher pressure when the side of the hydraulic oil cylinder 8 provides a lower pressure, so that the ionic liquid pressure cylinder is used for compressing air in the working cylinder 5;

in the present embodiment, the height (in the up-down direction) of the ionic liquid inlet conduit 1 and the ionic liquid outlet conduit 4 above the ionic liquid pressurizing cylinder 19 is higher than the limit height that the piston rod 7 can reach by pushing the ionic liquid 18 in the ionic liquid pressurizing cylinder 19.

The working principle of the device is as follows: firstly, gas is filled in a compression working chamber 6 through a low-pressure gas pipeline 2, an oil pump 11 provides pressure oil liquid for a lower cavity 14 of a hydraulic oil cylinder through a three-position four-way reversing valve 9, a piston rod 7 pushes ionic liquid 18 to enter a gas compression working cylinder 5 for gas compression, when the gas pressure in the compression working chamber 6 rises to reach the specified exhaust pressure, high-pressure gas is discharged through a high-pressure gas pipeline 3, then pressure oil liquid is provided for an upper cavity 15 of the hydraulic oil cylinder through the three-position four-way reversing valve 9, the piston rod 7 is pushed to send the oil liquid 17 back to an oil tank 13, the pressure in the compression working chamber 6 is gradually reduced along with the return of the oil liquid 17 to the oil tank 13, and when the overall pressure of the gas compression device is reduced to the specified intake pressure, the gas compression device.

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.