阅读说明：本技术 一种基于液体活塞的气体压缩装置 (Gas compression device based on liquid piston ) 是由 张明俊 于 2020-06-05 设计创作，主要内容包括：本发明提供一种基于液体活塞的气体压缩装置,利用供液调压子系统获取高压液体,再基于液体的不可压缩性,将液体当作软活塞,与液位导向机构相互配合在压缩工作缸内往复运动,从而压缩上腔体中压力相对较低的气体；当排出高压气体后,再利用缸内残余气体将液体压出压缩工作缸的下腔体,如此往复运转,达到不断压缩气体目的；由此可见,本发明将液体当作活塞,使得压缩装置中没有金属运动部件,减少了摩擦损失和压缩噪声,同时液体可以更好地进行散热处理,提高了整个压缩效率,具有更好地节能和提高效率的潜力。(The invention provides a gas compression device based on a liquid piston, which is characterized in that a liquid supply and pressure regulation subsystem is used for obtaining high-pressure liquid, and then the liquid is taken as a soft piston based on the incompressibility of the liquid and is matched with a liquid level guide mechanism to reciprocate in a compression working cylinder, so that gas with relatively low pressure in an upper cavity is compressed; after high-pressure gas is discharged, the residual gas in the cylinder is used for pressing liquid out of the lower cavity of the compression working cylinder, and the reciprocating operation is carried out in such a way, so that the aim of continuously compressing the gas is fulfilled; therefore, the liquid is used as the piston, so that no metal moving part is arranged in the compression device, the friction loss and the compression noise are reduced, meanwhile, the liquid can be better subjected to heat dissipation treatment, the whole compression efficiency is improved, and the potential of better energy conservation and efficiency improvement is realized.)

1. A gas compression device based on a liquid piston is characterized by comprising a compression working cylinder (3), a liquid supply and pressure regulation subsystem (4) and a liquid storage subsystem (5), wherein the compression working cylinder (3) comprises a cylinder body, an air inlet and exhaust upper cover (18), an air inlet check valve (19), an exhaust check valve (20), an air inlet and exhaust lower cover (23), a liquid inlet check valve (21), a liquid discharge check valve (22) and a liquid level guide mechanism (24); the exhaust upper cover (18) and the liquid inlet and outlet lower cover (23) are respectively arranged at two ends of the cylinder body; the air inlet one-way valve (19) and the air outlet one-way valve (20) are arranged on the air outlet upper cover (18), the liquid inlet one-way valve (21) and the liquid outlet one-way valve (22) are arranged on the liquid inlet and outlet lower cover (23), and the liquid level guide mechanism (24) is arranged in the cylinder body and is in sliding fit with the cylinder body to divide the cylinder body into an upper cavity and a lower cavity;

the air inlet one-way valve (19) is used for inputting gas to be compressed into the upper cavity; the exhaust check valve (20) is used for exhausting compressed gas to an external gas using device after the gas to be compressed reaches a specified pressure;

the liquid supply and pressure regulation subsystem (4) is used for sucking out liquid stored in the liquid storage subsystem (5) and pressurizing the liquid;

the liquid inlet one-way valve (21) is used for inputting the pressurized liquid into the lower cavity; the liquid drainage one-way valve (22) is used for draining liquid in the lower cavity back to the liquid storage subsystem (5) through the liquid supply and pressure regulation subsystem (4);

the liquid level guide mechanism (24) is used for compressing the gas to be compressed in the upper cavity under the pushing of the liquid in the lower cavity until the pressure of the gas to be compressed in the upper cavity reaches the designated pressure.

2. A liquid piston based gas compression apparatus as claimed in claim 1 further comprising a gas pre-treatment subsystem (1);

the gas pretreatment subsystem (1) is used for pretreating gas to be compressed and then enabling the pretreated gas to enter the upper cavity through the gas inlet one-way valve (19), wherein the pretreatment comprises filtration and pressure stabilization regulation.

3. A liquid piston based gas compression device according to claim 2, characterized in that the gas pre-treatment subsystem (1) comprises an electrically controlled inlet shutoff valve (7), a gas filter (8), a pressure regulating valve (9) and a pressure sensor (10);

the air inlet electric control stop valve (7) is used for controlling the time for the gas to be compressed to enter the gas filter (8);

the gas filter (8) is used for filtering impurities in the gas to be compressed;

the pressure sensor (10) is used for measuring the pressure of the gas to be compressed;

the pressure regulating valve (9) is used for performing pressure stabilizing regulation on the gas to be compressed according to the pressure, so that the gas to be compressed is maintained in a set pressure range before entering the air inlet one-way valve (19).

4. A liquid piston based gas compression apparatus as claimed in claim 1, further comprising a gas aftertreatment subsystem (2);

the gas post-processing subsystem (2) is used for receiving the gas which is exhausted by the exhaust one-way valve (20) and reaches the designated pressure, performing post-processing, and then conveying the gas to an external gas device, wherein the post-processing comprises drying, cooling and adjusting the pressure and the temperature to the set range.

5. A liquid piston based gas compression device according to claim 4, characterized in that the gas post-treatment subsystem (2) comprises an exhaust electrically controlled shut-off valve (15), a gas-liquid separator (11), a cooling heat exchanger (12), a flow meter (16), a pressure sensor (13), a temperature sensor (14), a safety drain valve (17);

the gas-liquid separator (11) is used for separating liquid in the gas reaching a specified pressure;

the temperature sensor (14) is used for measuring the temperature of the gas after gas-liquid separation;

the cooling heat exchanger (12) is used for cooling the gas subjected to gas-liquid separation according to the temperature to enable the gas to reach the specified temperature;

the pressure sensor (13) is used for measuring the pressure of the gas subjected to gas-liquid separation;

the safety discharge valve (17) is used for discharging overpressure gas when the pressure of the gas subjected to gas-liquid separation exceeds a set value;

the flow meter (16) is used for discharging gas which has pressure not exceeding a set value and is subjected to gas-liquid separation, and calculating the flow rate of the discharged gas.

6. A liquid piston based gas compression device according to claim 1, characterized in that the compression cylinder (3) further comprises a safety blow-off valve (25);

the safety liquid discharge valve (25) is used for discharging overpressure liquid when the liquid pressure of the lower cavity exceeds a set value.

7. The liquid piston-based gas compression device as claimed in claim 1, wherein the liquid supply pressure regulating subsystem (4) comprises a driving motor (26), a hydraulic pump (27), an overflow valve (28), a liquid supply pressure regulating valve (29), a liquid supply flow valve (30), a reversing valve (31), a liquid return flow valve (32), a liquid return pressure regulating valve (33), a pump source pressure gauge (34) and a liquid return pressure gauge (35);

the hydraulic pump (27) is used for sucking out liquid stored in the liquid storage subsystem (5) under the driving of the driving motor (26);

the pump source pressure gauge (34) is used for measuring the pressure of the liquid sucked out by the hydraulic pump (27);

the overflow valve (28) is used for discharging overpressure liquid when the pressure of the liquid exceeds a set value;

the liquid supply pressure regulating valve (29) is used for regulating the pressure of liquid to keep the pressure in a set range;

the liquid supply flow valve (30) is used for adjusting the flow of liquid to keep the flow within a set range;

the reversing valve (31) is used for changing the flow direction of liquid, wherein when liquid is fed, the flow direction of the liquid is from the liquid feeding pressure regulating subsystem (4) to the compression working cylinder (3), and when liquid is discharged, the flow direction of the liquid is from the compression working cylinder (3) to the liquid feeding pressure regulating subsystem (4);

the liquid return flow valve (32) is used for adjusting the flow of liquid discharged by the liquid discharge one-way valve (22) to keep the flow in a set range;

the liquid return pressure gauge (35) is used for measuring the pressure of liquid discharged by the liquid discharge one-way valve (22);

the liquid return pressure regulating valve (33) is used for regulating the pressure of the liquid discharged by the liquid discharge one-way valve (22) to keep the pressure in a set range.

8. A liquid piston based gas compressing device as claimed in claim 1, characterized in that the reservoir subsystem (5) comprises a reservoir (36), a heater (37), a cooler (38), a level gauge (39), a temperature sensor (40), a breather valve (41) and a filter (42);

the liquid storage tank (36) is used for storing liquid;

the liquid level meter (39) is used for measuring the storage amount of liquid in the liquid storage tank (36);

the temperature sensor (40) is used for measuring the temperature of the liquid in the liquid storage tank (36);

the heater (37) and the cooler (38) are respectively used for heating and cooling the liquid in the liquid storage tank (36) to keep the liquid in a set range;

-said venting valve (41) being adapted to keep the reservoir (36) in communication with the atmosphere;

the filter (42) filters the liquid returned by the liquid supply and pressure regulation subsystem (4).

9. The gas compression device based on the liquid piston is characterized by further comprising an electric control subsystem (6), wherein the electric control subsystem (6) comprises a control computer (43), a data acquisition unit (45), an actuator (44) and a safety protection switch (46);

the data acquisition unit (45) is used for acquiring the gas pressure of the upper cavity, the liquid pressure of the lower cavity, the position of the liquid level guide mechanism (24) in the cylinder body and the pressure of liquid sucked out by the liquid supply and pressure regulation subsystem (4) in real time;

the control computer (43) is used for sending a control command according to the gas pressure of the upper cavity, the liquid pressure of the lower cavity, the position of the liquid level guide mechanism (24) in the cylinder body and the pressure of liquid sucked out by the liquid supply and pressure regulation subsystem (4);

the actuator (44) is used for converting the control instruction into analog signals for opening and closing the air inlet check valve (19), the air outlet check valve (20), the liquid inlet check valve (21), the liquid discharge check valve (22) and the liquid supply pressure regulating subsystem (4);

the safety protection switch (46) is used for performing overcurrent protection on the data collector (45) and the actuator (44).

Technical Field

The invention belongs to the technical field of gas compression, and particularly relates to a gas compression device based on a liquid piston.

Background

At present, the gas high-pressure compression technology mainly adopts a positive displacement compression mode, and a typical case is a piston compressor. The piston compressor compresses the working space of the cylinder body by adopting the reciprocating motion of the solid piston to compress gas. The piston is connected with a crank by a connecting rod, and the crank is driven by a motor to drive the piston to reciprocate. Although the general piston compressor has mature technology and wide application, the general piston compressor has a plurality of metal moving parts and has larger mechanical loss and friction loss. In the process of metal piston movement, part of kinetic energy is converted into heat energy to be lost due to metal friction, and the metal part to be rubbed also needs to be cooled and lubricated, so that the energy consumption is high and the efficiency is low.

Disclosure of Invention

In order to solve the problems, the invention provides a gas compression device based on a liquid piston, which utilizes a hydraulic mechanism to form high-pressure liquid, compresses gas with relatively low pressure entering a working cylinder, and utilizes residual gas in the cylinder to press the liquid out of the working cylinder after the high-pressure gas is discharged, so that the reciprocating operation is carried out, the compression purpose is achieved, the whole compression efficiency can be improved, and the gas compression device has the potential of better energy conservation and efficiency improvement.

A gas compression device based on a liquid piston comprises a compression working cylinder 3, a liquid supply and pressure regulation subsystem 4 and a liquid storage subsystem 5, wherein the compression working cylinder 3 comprises a cylinder body, an air inlet and exhaust upper cover 18, an air inlet one-way valve 19, an exhaust one-way valve 20, an air inlet and exhaust lower cover 23, an air inlet one-way valve 21, an exhaust one-way valve 22 and a liquid level guide mechanism 24; the exhaust upper cover 18 and the liquid inlet and outlet lower cover 23 are respectively arranged at two ends of the cylinder body; the air inlet one-way valve 19 and the air outlet one-way valve 20 are arranged on the air outlet upper cover 18, the liquid inlet one-way valve 21 and the liquid outlet one-way valve 22 are arranged on the liquid inlet and outlet lower cover 23, and the liquid level guide mechanism 24 is arranged in the cylinder body and is in sliding fit with the cylinder body to divide the cylinder body into an upper cavity and a lower cavity;

the air inlet one-way valve 19 is used for inputting gas to be compressed into the upper cavity; the exhaust check valve 20 is used for exhausting the compressed gas to an external gas using device after the gas to be compressed reaches a specified pressure;

the liquid supply and pressure regulation subsystem 4 is used for sucking out liquid stored in the liquid storage subsystem 5 and pressurizing the liquid;

the liquid inlet one-way valve 21 is used for inputting the pressurized liquid into the lower cavity; the liquid discharge one-way valve 22 is used for discharging the liquid in the lower cavity back to the liquid storage subsystem 5 through the liquid supply and pressure regulating subsystem 4;

the liquid level guide mechanism 24 is used for compressing the gas to be compressed in the upper cavity under the pushing of the liquid in the lower cavity until the pressure of the gas to be compressed in the upper cavity reaches the designated pressure.

Further, the gas compression device based on the liquid piston further comprises a gas pretreatment subsystem 1;

the gas pretreatment subsystem 1 is used for pretreating gas to be compressed and then enabling the pretreated gas to enter the upper cavity through the gas inlet one-way valve 19, wherein the pretreatment comprises filtration and pressure stabilization regulation.

Further, the gas pretreatment subsystem 1 comprises an air inlet electric control stop valve 7, a gas filter 8, a pressure regulating valve 9 and a pressure sensor 10;

the air inlet electric control stop valve 7 is used for controlling the time for the gas to be compressed to enter the gas filter 8;

the gas filter 8 is used for filtering impurities in the gas to be compressed;

the pressure sensor 10 is used for measuring the pressure of the gas to be compressed;

the pressure regulating valve 9 is used for performing pressure stabilization regulation on the gas to be compressed according to the pressure, so that the gas to be compressed is maintained within a set pressure range before entering the air inlet one-way valve 19.

Further, the gas compression device based on the liquid piston further comprises a gas post-processing subsystem 2;

the gas post-processing subsystem 2 is used for receiving the gas which is exhausted by the exhaust check valve 20 and reaches the designated pressure, performing post-processing, and then conveying the gas to an external gas device, wherein the post-processing comprises drying, cooling, and adjusting the pressure and the temperature to the set range.

Further, the gas post-processing subsystem 2 comprises an exhaust electronic control stop valve 15, a gas-liquid separator 11, a cooling heat exchanger 12, a flowmeter 16, a pressure sensor 13, a temperature sensor 14 and a safety discharge valve 17;

the gas-liquid separator 11 is used for separating liquid in the gas reaching a specified pressure;

the temperature sensor 14 is used for measuring the temperature of the gas after gas-liquid separation;

the cooling heat exchanger 12 is used for cooling the gas subjected to gas-liquid separation according to the temperature to enable the gas to reach the specified temperature;

the pressure sensor 13 is used for measuring the pressure of the gas after gas-liquid separation;

the safety discharge valve 17 is used for discharging overpressure gas when the pressure of the gas subjected to gas-liquid separation exceeds a set value;

the flowmeter 16 is configured to discharge the gas whose pressure does not exceed a set value and which has undergone gas-liquid separation, and calculate a flow rate of the discharged gas.

Further, the compression cylinder 3 further comprises a safety liquid discharge valve 25;

the safety liquid discharge valve 25 is used for discharging overpressure liquid when the liquid pressure of the lower cavity exceeds a set value.

Further, the liquid supply pressure regulating subsystem 4 comprises a driving motor 26, a hydraulic pump 27, an overflow valve 28, a liquid supply pressure regulating valve 29, a liquid supply flow valve 30, a reversing valve 31, a liquid return flow valve 32, a liquid return pressure regulating valve 33, a pump source pressure gauge 34 and a liquid return pressure gauge 35;

the hydraulic pump 27 is used for sucking out the liquid stored in the liquid storage subsystem 5 under the driving of the driving motor 26;

the pump source pressure gauge 34 is used for measuring the pressure of the liquid sucked out by the hydraulic pump 27;

the overflow valve 28 is used for discharging overpressure liquid when the pressure of the liquid exceeds a set value;

the liquid supply pressure regulating valve 29 is used for regulating the pressure of liquid to keep the pressure in a set range;

the liquid supply flow valve 30 is used for adjusting the flow of the liquid to keep the flow within a set range;

the reversing valve 31 is used for changing the flow direction of liquid, wherein when liquid is fed, the flow direction of the liquid is from the liquid supply pressure regulating subsystem 4 to the compression working cylinder 3, and when liquid is discharged, the flow direction of the liquid is from the compression working cylinder 3 to the liquid supply pressure regulating subsystem 4;

the liquid return flow valve 32 is used for adjusting the flow of the liquid discharged by the liquid discharge one-way valve 22 to keep the flow within a set range;

the liquid return pressure gauge 35 is used for measuring the pressure of the liquid discharged by the liquid discharge check valve 22;

the liquid return pressure regulating valve 33 is used to regulate the pressure of the liquid discharged from the liquid discharge check valve 22 so as to maintain the pressure within a set range.

Further, the reservoir subsystem 5 includes a reservoir 36, a heater 37, a cooler 38, a liquid level meter 39, a temperature sensor 40, a vent valve 41, and a filter 42;

the liquid storage tank 36 is used for storing liquid;

the level gauge 39 is used to measure the amount of liquid stored in the tank 36;

the temperature sensor 40 is used for measuring the temperature of the liquid in the liquid storage tank 36;

the heater 37 and the cooler 38 are used for heating and cooling the liquid in the liquid storage tank 36 to maintain the liquid in a set range;

the vent valve 41 is used to keep the reservoir 36 in communication with the atmosphere;

the filter 42 filters the liquid returned by the liquid supply and pressure regulation subsystem 4.

Further, the gas compression device based on the liquid piston further comprises an electric control subsystem 6, wherein the electric control subsystem 6 comprises a control computer 43, a data acquisition unit 45, an actuator 44 and a safety protection switch 46;

the data collector 45 is used for collecting the gas pressure of the upper cavity, the liquid pressure of the lower cavity, the position of the liquid level guide mechanism 24 in the cylinder body and the pressure of liquid sucked out by the liquid supply and pressure regulation subsystem 4 in real time;

the control computer 43 is used for sending a control instruction according to the gas pressure of the upper cavity, the liquid pressure of the lower cavity, the position of the liquid level guide mechanism 24 in the cylinder body and the pressure of the liquid sucked out by the liquid supply and pressure regulation subsystem 4;

the actuator 44 is used for converting the control instruction into analog signals for opening and closing the air inlet check valve 19, the air outlet check valve 20, the liquid inlet check valve 21, the liquid discharge check valve 22 and the liquid supply pressure regulating subsystem 4;

the safety protection switch 46 is used for performing overcurrent protection on the data collector 45 and the actuator 44.

Has the advantages that:

the invention provides a gas compression device based on a liquid piston, which is characterized in that a liquid supply and pressure regulation subsystem is used for obtaining high-pressure liquid, and then the liquid is taken as a soft piston based on the incompressibility of the liquid and is matched with a liquid level guide mechanism to reciprocate in a compression working cylinder, so that gas with relatively low pressure in an upper cavity is compressed; after high-pressure gas is discharged, the residual gas in the cylinder is used for pressing liquid out of the lower cavity of the compression working cylinder, and the reciprocating operation is carried out in such a way, so that the aim of continuously compressing the gas is fulfilled; therefore, the liquid is used as the piston, so that no metal moving part is arranged in the compression device, the friction loss and the compression noise are reduced, meanwhile, the liquid can be better subjected to heat dissipation treatment, the whole compression efficiency is improved, and the potential of better energy conservation and efficiency improvement is realized.

Drawings

FIG. 1 is a schematic diagram of a high pressure gas compression apparatus according to the present invention;

FIG. 2 is a schematic diagram of a gas pretreatment subsystem provided by the present invention;

FIG. 3 is a schematic diagram of a gas aftertreatment subsystem provided by the present invention;

FIG. 4 is a schematic diagram of a compression working cylinder subsystem provided by the present invention;

FIG. 5 is a schematic diagram of a liquid supply pressure regulating subsystem provided by the present invention;

FIG. 6 is a schematic diagram of a reservoir subsystem provided by the present invention;

FIG. 7 is a schematic diagram of an electronic control subsystem provided by the present invention;

1-a gas pretreatment subsystem, 2-a gas post-treatment subsystem, 3-a compression working cylinder subsystem, 4-a liquid supply and pressure regulation subsystem, 5-a liquid storage subsystem, 6-an electric control subsystem, 7-an air inlet electric control stop valve, 8-a gas filter, 9-a pressure regulating valve, 10-a pressure sensor, 11-a gas-liquid separator, 12-a cooling heat exchanger, 13-a pressure sensor, 14-a temperature sensor, 15-an exhaust electric control stop valve, 16-a flow meter, 17-a safety discharge valve, 18-an air inlet and exhaust upper cover, 19-an air inlet one-way valve, 20-an exhaust one-way valve, 21-a liquid inlet one-way valve, 22-a liquid discharge one-way valve, 23-an air inlet and liquid discharge lower cover, 24-a liquid level guide mechanism, 25-a safety, 26-driving motor, 27-hydraulic pump, 28-overflow valve, 29-liquid supply pressure regulating valve, 30-liquid supply flow valve 31-reversing valve, 32-liquid return flow valve, 33-liquid return pressure regulating valve 34-pump source pressure gauge, 35-liquid return pressure gauge, 36-liquid storage tank, 37-heater, 38-cooler, 39-liquid level gauge, 40-temperature sensor, 41-vent valve, 42-filter, 43-control computer, 44-actuator, 45-data collector and 46-safety protection switch.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

The invention provides a high-pressure gas compression device which is mainly realized by using a liquid piston technology, and the core principle of the device is that the aim is achieved by continuously injecting and pumping high-pressure liquid into a compression working cylinder by using the incompressibility of the liquid.

As shown in figure 1, the device comprises a gas pretreatment subsystem 1, a gas post-treatment subsystem 2, a compression working cylinder 3, a liquid supply and pressure regulation subsystem 4, a liquid storage subsystem 5 and an electric control subsystem 6.

As shown in fig. 2, the gas pretreatment subsystem can control the characteristic parameters of the gas pressure, flow rate, etc. entering the compression working cylinder 3, and specifically comprises an intake electrically-controlled stop valve 7, a gas filter 8, a pressure regulating valve 9, and a pressure sensor 10, optionally, the gas filter 8 should be located at the front end of the pressure regulating valve 9, and the electrically-controlled stop valve 7 is a necessary control element and should be arranged in front of the gas filter 8; the gas pretreatment subsystem 1 is used for pretreating gas to be compressed and then feeding the gas into the compression working cylinder 3, wherein the pretreatment comprises filtration and pressure stabilization regulation, and specifically comprises the following steps:

the air inlet electric control stop valve 7 is used for controlling the time for the gas to be compressed to enter the gas filter 8;

the gas filter 8 is used for filtering impurities in the gas to be compressed;

the pressure sensor 10 is used for measuring the pressure of the gas to be compressed;

the pressure regulating valve 9 is used for performing pressure stabilization regulation on the gas to be compressed according to the pressure, so that the gas to be compressed is maintained within a set pressure range before entering the compression working cylinder 3.

As shown in fig. 3, the compression cylinder 3 comprises a cylinder body, an upper air inlet and outlet cover 18, an air inlet check valve 19, an air outlet check valve 20, a lower liquid inlet and outlet cover 23, a liquid inlet check valve 21, a liquid outlet check valve 22, a liquid level guide mechanism 24 and a safety liquid discharge valve 25; the exhaust upper cover 18 and the liquid inlet and outlet lower cover 23 are respectively arranged at two ends of the cylinder body; the air inlet one-way valve 19 and the air outlet one-way valve 20 are arranged on the air outlet upper cover 18, the liquid inlet one-way valve 21 and the liquid discharge one-way valve 22 are arranged on the liquid inlet and discharge lower cover 23, the liquid level guide mechanism 24 is arranged in the cylinder body and is in sliding fit with the cylinder body to divide the cylinder body into an upper cavity and a lower cavity, and the safety liquid discharge valve 25 is arranged on the lower cavity;

the air inlet one-way valve 19 is used for inputting the gas to be compressed output by the gas pretreatment subsystem 1 into the upper cavity until the liquid level guide mechanism 24 is pushed by the gas to be compressed to move downwards to a set liquid level of a bottom dead center; the exhaust one-way valve 20 is used for being in a closed state before the gas to be compressed reaches the designated pressure, namely releasing the compressed gas from the upper cavity after the gas to be compressed reaches the designated pressure and exhausting the gas to the gas post-processing subsystem 2;

the liquid supply and pressure regulation subsystem 4 is used for sucking out the liquid stored in the liquid storage subsystem 5 and pressurizing the liquid after the liquid level guide mechanism 24 moves downwards to a set liquid level at a bottom dead center;

the liquid inlet one-way valve 21 is used for inputting the pressurized liquid into the lower cavity until the liquid level guide mechanism 24 moves to a set upper stop point liquid level under the pushing of the liquid; the liquid discharge one-way valve 22 is used for closing the liquid level guide mechanism 24 when the liquid supply pressure regulating subsystem 4 starts to suck out liquid and before the liquid level guide mechanism moves to the top dead center liquid level; that is, after the gas to be compressed reaching the specified pressure is released from the upper cavity by a certain amount, the liquid discharge check valve 22 discharges the liquid in the lower cavity back to the liquid storage subsystem 5 through the liquid supply and pressure regulation subsystem 4;

the liquid level guide mechanism 24 is used for compressing the gas to be compressed in the upper cavity under the pushing of the liquid in the lower cavity until the pressure of the gas to be compressed in the upper cavity reaches a specified pressure, the exhaust one-way valve 20 exhausts the gas reaching the specified pressure to the gas post-processing subsystem 2, and the gas is subjected to post-processing by the gas post-processing subsystem 2 and then is transmitted to an external gas device, wherein the post-processing comprises drying, cooling and adjusting the pressure and the temperature to a set range;

the safety liquid discharge valve 25 is used for discharging overpressure liquid when the liquid pressure of the lower cavity exceeds a set value, and the compression pressure is guaranteed to be in a safety range.

The liquid level guide mechanism can also integrate a liquid level meter and a pressure sensor, collect liquid level information and pressure information, send the liquid level information and the pressure information to the electronic control subsystem, and then guide the opening and closing of the liquid inlet and outlet valve by the electronic control subsystem; the safety liquid discharge valve is arranged at the lower part of the cylinder body to ensure that high-pressure liquid is discharged; in addition, if the electronic control subsystem is needed to control the opening and the conduction of the air inlet check valve and the air exhaust check valve, an air inlet pressure sensor and an air exhaust pressure sensor can be respectively arranged on the air inlet check valve and the air exhaust check valve, the pressure at the air inlet check valve and the air exhaust check valve is measured by the two sensors, then the pressure value is fed back to the electronic control subsystem, and finally the electronic control subsystem sends out a relevant instruction according to the pressure value.

As shown in fig. 4, the gas post-processing subsystem 2 can control parameters of dryness, pressure and temperature of the discharged gas, and ensure safe and normal operation of subsequent devices or equipment, and specifically includes an exhaust electrically-controlled stop valve 15, a gas-liquid separator 11, a cooling heat exchanger 12, a flowmeter 16, a pressure sensor 13, a temperature sensor 14 and a safe discharge valve 17;

the gas-liquid separator 11 is used for separating liquid in the gas reaching a specified pressure;

the temperature sensor 14 is used for measuring the temperature of the gas after gas-liquid separation;

the cooling heat exchanger 12 is used for cooling the gas subjected to gas-liquid separation according to the temperature to enable the gas to reach the specified temperature;

the pressure sensor 13 is used for measuring the pressure of the gas after gas-liquid separation;

the safety discharge valve 17 is used for discharging overpressure gas when the pressure of the gas subjected to gas-liquid separation exceeds a set value;

the flowmeter 16 is configured to discharge the gas whose pressure does not exceed a set value and which has undergone gas-liquid separation, and calculate a flow rate of the discharged gas.

It should be noted that high-pressure gas-liquid separation should be carried out on high-pressure exhaust gas firstly, cooling and cooling should be carried out on the gas after separation, pressure control of the high-pressure gas is comprehensively controlled by a pressure sensor, an electric control stop valve and a safety relief valve, and the flowmeter should be installed at the last part to prevent overpressure, overtemperature and liquid drops from damaging the flowmeter.

As shown in fig. 5, the liquid supply pressure regulating subsystem 4 includes a driving motor 26, a hydraulic pump 27, an overflow valve 28, a liquid supply pressure regulating valve 29, a liquid supply flow valve 30, a reversing valve 31, a liquid return flow valve 32, a liquid return pressure regulating valve 33, a pump source pressure gauge 34 and a liquid return pressure gauge 35;

the hydraulic pump 27 is used for sucking out the liquid stored in the liquid storage subsystem 5 under the driving of the driving motor 26;

the pump source pressure gauge 34 is used for measuring the pressure of the liquid sucked out by the hydraulic pump 27;

the overflow valve 28 is used for discharging overpressure liquid when the pressure of the liquid exceeds a set value;

the liquid supply pressure regulating valve 29 is used for regulating the pressure of liquid to keep the pressure in a set range;

the liquid supply flow valve 30 is used for adjusting the flow of the liquid to keep the flow within a set range;

the reversing valve 31 is used for changing the flow direction of liquid, wherein when liquid is fed, the flow direction of the liquid is from the liquid supply pressure regulating subsystem 4 to the compression working cylinder 3, and when liquid is discharged, the flow direction of the liquid is from the compression working cylinder 3 to the liquid supply pressure regulating subsystem 4;

the liquid return flow valve 32 is used for adjusting the flow of the liquid discharged by the liquid discharge one-way valve 22 to keep the flow within a set range;

the liquid return pressure gauge 35 is used for measuring the pressure of the liquid discharged by the liquid discharge check valve 22;

the liquid return pressure regulating valve 33 is used to regulate the pressure of the liquid discharged from the liquid discharge check valve 22 so as to maintain the pressure within a set range.

Therefore, the driving motor and the hydraulic pump form a liquid supply unit; the safety overflow valve ensures the safety of hydraulic management pressure; the pressure regulating valve and the flow regulating valve control the flow and the pressure of the liquid supply pipeline; the liquid return pressure regulating valve and the liquid return flow valve control the pressure and the flow of the return liquid; the reversing valve controls the liquid supply and return of the liquid inlet and outlet check valve of the compression working cylinder.

It should be noted that the reversing mechanism not only has the function of liquid supply and return, but also has the function of ensuring pressure balance, and the liquid supply and return should be designed with valves for pressure and flow regulation, so as to ensure that the pressure and flow can be safely and reliably fed into and discharged from the working cylinder; meanwhile, a manual stop valve can be arranged between the liquid supply pressure regulating valve 29 and the liquid supply flow valve 30, and the manual stop valve plays a role in opening and cutting off a liquid supply pipeline.

As shown in fig. 6, the reservoir subsystem 5 includes a reservoir 36, a heater 37, a cooler 38, a level gauge 39, a temperature sensor 40, a vent valve 41, and a filter 42;

the liquid storage tank 36 is used for storing liquid;

the level gauge 39 is used to measure the amount of liquid stored in the tank 36;

the temperature sensor 40 is used for measuring the temperature of the liquid in the liquid storage tank 36;

the heater 37 and the cooler 38 are respectively used for heating and cooling the liquid in the liquid storage tank 36, and are used for taking away surplus heat of the liquid or providing heat for the liquid, so that the liquid is maintained in a set range;

the breather valve 41 is used for keeping the liquid storage tank 36 communicated with the atmospheric environment, so that the pressure in the liquid storage tank is ensured to be in a safe state, and the normal operation of a cooler, a heater and a liquid level meter is not influenced;

the filter 42 filters the liquid returned by the liquid supply and pressure regulation subsystem 4.

As shown in fig. 7, the electronic control subsystem 6 includes a control computer 43, a data collector 45, an actuator 44 and a safety protection switch 46;

the data collector 45 is used for collecting the gas pressure of the upper cavity, the liquid pressure of the lower cavity, the position of the liquid level guide mechanism 24 in the cylinder body and the pressure of liquid sucked out by the liquid supply and pressure regulation subsystem 4 in real time;

the control computer 43 is used for sending a control instruction according to the gas pressure of the upper cavity, the liquid pressure of the lower cavity, the position of the liquid level guide mechanism 24 in the cylinder body and the pressure of the liquid sucked out by the liquid supply and pressure regulation subsystem 4;

the actuator 44 is used for converting the control instruction into analog signals for opening and closing the air inlet check valve 19, the air outlet check valve 20, the liquid inlet check valve 21, the liquid discharge check valve 22 and the liquid supply pressure regulating subsystem 4;

the safety protection switch 46 is used for performing overcurrent protection on the data collector 45 and the actuator 44.

Therefore, the gas compression device of the invention can provide pressure through liquid to compress gas, thereby achieving the purpose of high-pressure compression, and comprises a gas pretreatment subsystem 1 and a gas post-treatment subsystem 2 which are used for gas inlet and exhaust treatment; the main compression process is completed in the compression working cylinder subsystem 3; the liquid pressure and flow are provided for the working cylinder by the liquid supply and pressure regulation subsystem 4; the liquid storage subsystem 5 stores liquid, and filters, heats and cools the liquid; all subsystems feed back information to the electric control system 6 and the electric control system control device operates normally.

The theoretical principle and working process of the gas compression device provided by the present invention will be described in detail below:

first, a low pressure gas source provides a gas at a lower pressure to the gas pretreatment subsystem 1. The timing of the low-pressure gas entering the device is controlled by the electric control stop valve 7, and the air inlet pipeline is closed safely. The low-pressure gas passes through the filter 8 to filter solid impurities in the gas, so that subsequent device components are prevented from being damaged. The pressure regulating valve 9 and the pressure sensor 10 are mutually matched to perform pressure stabilizing regulation on the inlet air pressure, so that the air pressure is always in a constant pressure supply state before entering the compression working cylinder 3.

After the gas enters the compression working cylinder 3, the gas flows through the gas inlet one-way valve 19 in the gas inlet and outlet upper cover 18 and enters the compression chamber, at the moment, the gas outlet one-way valve 20 is in a closed state until the liquid level guide mechanism 24 is pushed by the gas to be compressed to move downwards to a set liquid level of a bottom dead center, and meanwhile, if the lower chamber has liquid, the liquid can enter and be discharged out of the cylinder body through the liquid inlet one-way valve 21 and the liquid discharge one-way valve 22 in the liquid inlet and discharge lower cover 23; then, the air inlet check valve 19, the air exhaust check valve 20 and the liquid discharge check valve 22 are closed, the liquid inlet check valve 21 is opened, and high-pressure liquid is continuously injected into a compression chamber in the cylinder, namely a lower cavity, so as to compress the gas in the upper cavity. When the gas pressure rises to reach the exhaust designated pressure, the exhaust check valve 20 is opened, the liquid inlet check valve 21 is continuously opened, the gas inlet check valve 19 and the liquid outlet check valve 22 are still in a closed state until the liquid level guide mechanism 24 moves to the top dead center liquid level in the cylinder, the liquid outlet check valve 22 is opened, the exhaust check valve 20 and the liquid inlet check valve 21 are closed, and the gas inlet check valve 19 is still in a closed state. The pressure in the cylinder is reduced along with the continuous discharge of the liquid, when the gas pressure is reduced to the designated gas inlet pressure, the gas inlet one-way valve 19 is opened, the liquid discharge one-way valve 22 is still in an open state until the liquid level guide mechanism 24 reaches the position of the liquid level at the bottom dead center, the gas inlet one-way valve 19 is closed, and the gas compression device repeats the operation to achieve the purpose of gas compression for many times. The liquid level guide mechanism 24 feeds back information to the electronic control subsystem 6, and the electronic control subsystem 6 controls the opening and closing of the liquid inlet check valve 21 and the liquid discharge check valve 22. If the pressure in the cylinder is abnormally increased, the overpressure liquid is discharged out of the cylinder through the safety liquid discharge valve 25, and the normal compression working state is ensured.

The compressed high pressure gas enters the gas aftertreatment subsystem 2 through a vent check valve 20 in the vent cover 18. The gas first flows through the high-pressure gas-liquid separator 11, and liquid droplets possibly carried out are separated from the high-pressure gas, so that the gas dryness is ensured. The gas is cooled by the cooling heat exchanger 12 to a suitable temperature. The pressure sensor 13 and the temperature sensor 14 feed back gas pressure and temperature signals to the electronic control subsystem, and the compression process and the cooling amount are adjusted, so that the high-pressure gas is in a safe pressure and temperature range. If the pressure exceeds the requirement, the overpressure gas is discharged out of the system by a safety discharge valve 17, and the safety of subsequent devices is guaranteed. An exhaust gas electronic control stop valve 15 is used to manage the exhaust gas management opening and closing. Finally, the gas flow discharged from the system is measured by the flow meter 16, and whether the flow rate meets the design requirement is judged.

The liquid entering the compression working cylinder 3 is supplied and regulated by the liquid supply and pressure regulation subsystem 4. Fluid is drawn from the reservoir subsystem 5 by a hydraulic pump 27 and a drive motor 26 is responsible for driving the hydraulic pump 27. An overflow valve 28 is provided in the hydraulic line to control the hydraulic pressure. The liquid supply pressure regulating valve 29 regulates the liquid pressure, and the liquid supply flow valve 30 regulates the liquid flow. The liquid flow direction is managed by the change valve 31, and the liquid supply direction is adjusted to the liquid feed check valve 21 and the liquid discharge check valve 22 at any time based on the feedback information of the liquid level guide mechanism 24 in the compression cylinder 3 and the feedback information of various pressure sensors. And the returned high-pressure liquid safely returns to the liquid storage subsystem through the liquid return flow valve 32 and the liquid return pressure regulating valve 33. The pump source pressure gauge 34 and the liquid return pressure gauge 35 provide liquid flow pressure information for the electronic control subsystem 6 for system control.

The liquid is stored in the liquid storage subsystem 5, and the functions of the liquid storage subsystem include cooling, heating, filtering, liquid level indication, box body exhaust and the like besides the function of storing the liquid. The heater 37 and the cooler 38, which serve to heat and cool the liquid, may be externally or internally configured. The level gauge 39 is used to indicate the amount of stored liquid. The temperature sensor 40 is used to feed back the temperature of the liquid stored in the tank 36. The liquid returning to the liquid storage subsystem 5 needs to pass through a filter 42 to ensure the purity of the returned liquid.

The whole gas compression device is controlled by the electronic control subsystem 6. The data collector 45 and the actuator 44 collect information of each subsystem through the safety protection switch 46 and send a control instruction given by the control computer to each subsystem, and then each subsystem executes according to the sent instruction. The control computer 43 is used for operating data and sending out a control instruction, namely collecting information of each subsystem from the data collector 45, and controlling the operation of each subsystem through the actuator 44 according to the setting to ensure the normal operation of the device; the safety protection switch protects the operation safety of the data acquisition unit and the actuator.

It should be noted that since gases below 4MPa do not have a good ability to be compressed for rapid reaction and if the in-cylinder pressure is too low, there is no guarantee that liquid will be removed from the cylinder; meanwhile, if the pressure of gas and liquid is large, such as exceeding 100MPa, the structural strength of the cylinder body is in risk of intolerance; therefore, in order to obtain better compression effect, the gas compression device is more suitable for gas compression with the pressure of 4-100 MPa.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it will be understood by those skilled in the art that various changes and modifications may be made herein without departing from the spirit and scope of the invention as defined in the appended claims.