Self-driven low-temperature liquid booster pump

Abstract

The invention discloses a self-driven low-temperature liquid booster pump, and relates to the technical field of low-temperature liquid pumping, and the self-driven low-temperature liquid booster pump is characterized by comprising a main air cavity, a main liquid cavity, a first piston, a second piston and a piston rod; the first piston divides the main air cavity into a first air cavity and a second air cavity; the second piston divides the total liquid cavity into a first liquid cavity and a second liquid cavity, and at least one of the first liquid cavity and the second liquid cavity is a liquid working cavity; two ends of the piston rod are respectively connected with the first piston and the second piston; low-temperature liquid can only flow out of the low-temperature liquid storage tank from the liquid working cavity in a one-way mode and then is gasified and alternately fed into the first air cavity and the second air cavity so as to drive the first piston to reciprocate. And the first gas cavity and the second gas cavity are communicated with equipment in a low-temperature liquid gas form. According to the piston pump, the gas form of the low-temperature liquid serves as a power source, energy consumption is low, the stable and efficient low-temperature liquid pumping efficiency is still kept in the low-temperature environment, and meanwhile the pollution risk of the low-temperature liquid in the pumping process is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic liquid pumping, in particular to a self-driven cryogenic liquid booster pump. Background Art

[0002] Hydrogen fuel cells are power generation devices that convert the chemical energy of hydrogen and oxygen into electrical energy. They are a type of green and clean battery that has attracted widespread attention. Since hydrogen is flammable and explosive and has a low density, the hydrogen required for hydrogen fuel cells is mostly transported and stored in the form of liquid hydrogen. When in use, liquid hydrogen is pumped to the hydrogen fuel cell for use through a hydrogen pump. Currently, the commonly used hydrogen pumps are generally piston-type liquid hydrogen pumps.

[0003] Chinese patent CN117927441A discloses a piston type liquid hydrogen pump, whose pump body comprises: a driving part, the driving part comprises a driving chamber, a first piston is arranged in the driving chamber, the first piston divides the driving chamber into a driving chamber 1 and a driving chamber 2, the driving chamber 1 is provided with a first inlet and outlet of driving liquid, and the driving chamber 2 is provided with a second inlet and outlet of driving liquid; a mushroom valve assembly, the first piston is provided with a liquid hole connecting the driving chamber 1 and the driving chamber 2, the mushroom valve assembly is movably arranged in the liquid hole and can be moved to seal the liquid hole; a hydraulic part, the hydraulic part comprises a hydraulic chamber, a second piston is arranged in the hydraulic chamber, the second piston divides the hydraulic chamber into a hydraulic chamber 1 and a hydraulic chamber 2; a piston rod, the piston rod is connected between the first piston and the second piston, the hydraulic chamber 2 is located on the side of the second piston facing away from the first piston, and the hydraulic chamber 2 is provided with a liquid hydrogen one-way inlet and a liquid hydrogen one-way outlet.

[0004] The liquid hydrogen pump drives the first piston up and down through the fluid medium, and the first piston drives the second piston to move through the piston rod, thereby sucking liquid hydrogen into the second hydraulic chamber or pumping it out of the second hydraulic chamber. The fluid medium in the driving chamber of the liquid hydrogen pump is generally not compatible with liquid hydrogen, such as hydraulic oil, which has a certain risk of contamination to liquid hydrogen. In addition, fluid media such as hydraulic oil are easily affected by the temperature of liquid hydrogen and solidify or thicken, making it more difficult to drive the first piston. Summary of the invention

[0005] In view of the existing piston-type liquid hydrogen pump, the fluid medium is not compatible with liquid hydrogen, there is a risk of liquid hydrogen contamination, and the fluid medium is easily affected by the temperature of liquid hydrogen to solidify or thicken, resulting in reduced liquid hydrogen pumping efficiency. The present invention provides a self-driven cryogenic liquid booster pump, which includes a pumping component and a gasification device.

[0006] The pumping assembly includes a total air cavity, a total liquid cavity, a first piston, a second piston and a piston rod. The first piston divides the total air cavity into a first air cavity and a second air cavity. The second piston divides the total liquid cavity into a first liquid cavity and a second liquid cavity. Both ends of the piston rod are connected to the first piston and the second piston respectively.

[0007] At least one of the first liquid cavity and the second liquid cavity is a liquid working cavity, and each liquid working cavity is provided with a liquid inlet check valve and a liquid outlet check valve. The first gas cavity and the second gas cavity are both provided with an inlet valve and an outlet valve, and all outlet valves can be connected to a device using a cryogenic liquid gas form. A gasification chamber is provided in the gasification device, and all liquid outlet check valves can be connected to the bottom of the gasification chamber, and all inlet valves can be connected to the top of the gasification chamber.

[0008] The present invention is further configured such that: the cross-sectional area of ​​the first piston perpendicular to the axis of the piston rod is greater than the cross-sectional area of ​​the second piston perpendicular to the axis of the piston rod.

[0009] The present invention is further configured such that: the first liquid chamber and the second liquid chamber are both liquid working chambers.

[0010] The present invention is further configured that: the air inlet valve and the air outlet valve are both electrically controlled air valves.

[0011] The present invention is further configured to include a third gas valve, both ends of which are respectively connected to the top of the gasification device and the equipment using the low-temperature liquid gas form.

[0012] The present invention is further configured to include a cryogenic liquid storage tank and a pressure balancing assembly, wherein the total gas cavity and the gasification device are located outside the cryogenic liquid storage tank, the total liquid cavity is located inside the cryogenic liquid storage tank, and the pressure balancing assembly is used to transport cryogenic liquid or the gas form of the cryogenic liquid into the cryogenic liquid storage tank to maintain the pressure stability in the cryogenic liquid storage tank.

[0013] The present invention is further configured as follows: the direction of the total air chamber and the total liquid chamber parallel to the piston rod axis is the length direction of the two, the liquid inlet one-way valve and the liquid outlet one-way valve are both arranged at the end of the total liquid chamber; the air inlet valve and the air outlet valve are both arranged at the end of the total air chamber.

[0014] The present invention is further configured as follows: the piston rod is arranged vertically, and the total air cavity is located above the total liquid cavity.

[0015] The present invention is further configured as follows: the pumping assembly further comprises a gas cylinder body and a liquid cylinder body, the total gas cavity is located in the gas cylinder body, and the total liquid cavity is located in the liquid cylinder body. The piston rod is in sliding seal with the gas cylinder body and the liquid cylinder body.

[0016] The present invention is further configured as follows: a heating structure for heating the gasification chamber is also provided in the gasification device.

[0017] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0018] This embodiment provides a piston pump that uses the gas form of a cryogenic liquid as a power source. The cryogenic liquid being pumped is compatible with its own gas form, which effectively reduces the risk of contamination during the pumping process of the cryogenic liquid. In addition, the boiling point of the cryogenic liquid is much lower than the boiling point of most substances, so that this embodiment can maintain stable and efficient pumping efficiency in a low-temperature environment. At the same time, since the boiling point of the cryogenic liquid is extremely low, the energy required for its vaporization is also extremely low, which significantly reduces the energy consumption required to pump the cryogenic liquid. The present invention can be used to pump liquids with a boiling point below minus 100°C. The pumped liquids include but are not limited to liquid hydrogen, liquid nitrogen, liquid helium, liquid neon, liquid argon and liquid oxygen.

[0019] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] In the figure: 11, cylinder body; 111, first air cavity; 112, second air cavity; 12, liquid cylinder body; 121, first liquid cavity; 122, second liquid cavity; 13, first piston; 14, second piston; 15, piston rod; 2, low-temperature liquid storage tank; 3, gasification device; 31, gasification chamber; 32, heat exchange cavity; 33, liquid delivery port; 34, exhaust port; 35, vent; 4, liquid inlet check valve; 5, liquid outlet check valve; 6, air inlet valve; 7, air outlet valve; 8, third air valve; 9, return valve; 101, liquid pipeline; 102, first gas pipeline; 103, second gas pipeline.

[0023] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0025] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] It should be noted that the cryogenic liquid referred to in the present invention is a liquid with a boiling point below -100°C, and the cryogenic liquid includes but is not limited to liquid hydrogen, liquid nitrogen, liquid helium, liquid neon, liquid argon and liquid oxygen. The cryogenic liquid storage tank in the present invention has the basic structure of a conventional cryogenic liquid storage container, such as an insulating structure for preventing heat leakage from air outside the cryogenic liquid storage tank into the cryogenic liquid storage tank.

[0028] Example

[0029] like Figure 1 As shown, it is the basic structure of a preferred embodiment of the present invention. This embodiment provides a self-driven cryogenic liquid booster pump, which includes a pumping component and a gasification device 3. This embodiment is installed on a cryogenic liquid storage tank 2. The cryogenic liquid storage tank 2 is provided with a pressure balancing component, which is used to transport cryogenic liquid or the gas form of cryogenic liquid into the cryogenic liquid storage tank 2 to maintain the pressure in the cryogenic liquid storage tank 2 stable. The pressure balancing component transports hydrogen or liquid hydrogen into the cryogenic liquid storage tank only when the liquid hydrogen in the cryogenic liquid storage tank is pumped out of the cryogenic liquid storage tank to supplement the volume of the liquid hydrogen pumped out, so as to achieve the effect of maintaining the pressure in the cryogenic liquid storage tank stable.

[0030] The pumping assembly includes a total air cavity, a total liquid cavity, a first piston 13, a second piston 14 and a piston rod 15. The first piston 13 is slidably sealed in the total air cavity, and the total air cavity is divided into a first air cavity 111 and a second air cavity 112 with a variable volume. The second piston 14 is slidably sealed in the total liquid cavity, and the total liquid cavity is divided into a first liquid cavity 121 and a second liquid cavity 122 with a variable volume. One end of the piston rod 15 is inserted into the second air cavity 112 and connected to the first piston 13, and the other end of the piston rod 15 is inserted into the first liquid cavity 121 and connected to the second piston 14; the walls of the second air cavity 112 and the first liquid cavity 121 are both slidably sealed with the piston rod 15.

[0031] The total air cavity is located outside the cryogenic liquid storage tank 2, and the total liquid cavity is located inside the cryogenic liquid storage tank 2. The cryogenic liquid storage tank 2 is sealed and connected to the pumping assembly between the total air cavity and the total liquid cavity. At least one of the first liquid cavity 121 and the second liquid cavity 122 is a liquid working cavity, and each liquid working cavity is provided with a liquid inlet and a liquid outlet. The direction of the total air cavity and the total liquid cavity parallel to the axis of the piston rod 15 is the length direction of the two, and the liquid inlet and the liquid outlet are both located at the end of the total liquid cavity. Each liquid inlet is provided with a liquid inlet check valve 4, which only allows cryogenic liquid to enter the liquid working cavity. Each liquid outlet is provided with a liquid outlet check valve 5, which only allows cryogenic liquid to discharge from the liquid working cavity.

[0032] The first air cavity 111 and the second air cavity 112 are both provided with an air inlet and an air outlet, and the air inlet and the air outlet are both located at the end of the total air cavity. Each air inlet is provided with an air inlet valve 6, and each air outlet is provided with an air outlet valve 7, and all air outlet valves 7 can be connected to equipment using the gas form of cryogenic liquid. The air inlet valve 6 connected to the first air cavity 111 and the air outlet valve 7 connected to the second air cavity 112 are the first valve group. The air inlet valve 6 connected to the second air cavity 112 and the air outlet valve 7 connected to the first air cavity 111 are the second valve group. The gas form of the cryogenic liquid can flow in both directions in the air inlet valve 6 and the air outlet valve 7.

[0033] The vaporization device 3 is used to vaporize the cryogenic liquid. In the present embodiment, a vaporization chamber 31 is provided in the vaporization chamber 3, a liquid delivery port 33 is provided at the bottom of the vaporization chamber 31, and an exhaust port 34 is provided at the top of the vaporization chamber 31. All liquid outlet one-way valves 5 can be connected to the liquid delivery port 33, and all air inlet valves 6 can be connected to the exhaust port 34. The vaporization device 3 has a heating structure, and its heating principle includes but is not limited to fluid heat exchange, resistance heating and electromagnetic heating. When the present embodiment is started, the vaporization chamber 31 turns on the heating function to heat the gas form of the cryogenic liquid inside itself, and increases the volume of the original cryogenic liquid gas form in the vaporization chamber 31, so that there is excess gas sent into the total gas cavity to start the first piston 13. In the present embodiment, the heating function of the vaporization chamber 31 is always kept on during the cryogenic liquid pumping process, which helps to accelerate the vaporization rate of the cryogenic liquid. It should be noted that after the present embodiment is started for a period of time, the heating function of the vaporization chamber 31 can also be turned off, and the low-temperature liquid can be vaporized into a gaseous state by means of the heat conducted into the vaporization chamber 31 by the normal temperature air, thereby providing driving force for the first piston 13 .

[0034] In this embodiment, the heating structure of the gasification device 3 is a heat exchange cavity 32, and the heat exchange cavity 32 surrounds the gasification chamber 31. A fluid medium flows in the heat exchange cavity 32. In this embodiment, the fluid medium in the heat exchange cavity 32 is water vapor.

[0035] In the initial state of this embodiment, the cryogenic liquid storage tank 2 stores cryogenic liquid, and the liquid level of the cryogenic liquid in the cryogenic liquid storage tank 2 is higher than all liquid inlets; at the same time, only the gas form of the cryogenic liquid should be present in the total gas cavity, the total liquid cavity and the vaporization chamber 31. All the inlet valves 6 and all the outlet valves 7 are in a closed state, and the vaporization device 3 is in a non-heating state.

[0036] In the working state of this embodiment, the first valve group and the second valve group are opened alternately, and the vaporization device 3 is opened. The gas in the vaporization chamber 31 expands due to heat, and enters the first air cavity 111 to push the first piston 13 to move toward the second air cavity 112 when the first valve group is opened, and enters the second air cavity 112 to push the first piston 13 to move toward the first air cavity 111 when the second valve group is opened, thereby driving the second piston 14 to reciprocate in the total liquid cavity, and pumping the cryogenic liquid in the cryogenic liquid storage tank 2 to the vaporization chamber 31.

[0037] This embodiment uses the gaseous form of the cryogenic liquid as the power source for cryogenic liquid pumping. The cryogenic liquid is compatible with its own gaseous form, which effectively reduces the risk of contamination during the cryogenic liquid pumping process. In addition, the boiling point of the cryogenic liquid is much lower than the boiling point of most substances, so that this embodiment can maintain stable and efficient cryogenic liquid pumping efficiency in a low-temperature environment. At the same time, since the boiling point of the cryogenic liquid is extremely low, the energy required for its vaporization is also extremely low, which significantly reduces the energy consumption required to pump the cryogenic liquid. The cryogenic liquid is a liquid with a boiling point below minus 100°C, including but not limited to liquid hydrogen, liquid nitrogen, liquid helium, liquid neon, liquid argon and liquid oxygen. This embodiment is illustrated using liquid hydrogen as an example.

[0038] Specifically, the piston rod 15 is vertically arranged, and the gravity of the piston rod 15 does not deviate from its own axis to act on the wall of the total air cavity. At this time, the friction resistance encountered by the piston rod 15 when moving is minimal, and the total air cavity is located above the total liquid cavity.

[0039] Specifically, when there is only one liquid working chamber, since the liquid inlet of the second liquid chamber 122 is located below the liquid hydrogen surface for the longest time, the second liquid chamber 122 located below the total liquid chamber should be selected as the liquid working chamber to pump as much liquid hydrogen as possible into the vaporization chamber 31.

[0040] In this embodiment, both the first liquid chamber 121 and the second liquid chamber 122 are liquid working chambers. Liquid hydrogen will be pumped into the vaporization chamber 31 regardless of whether the second piston 14 moves upward or downward, which significantly improves the liquid hydrogen pumping efficiency.

[0041] Specifically, the cross-sectional area of ​​the first piston 13 perpendicular to the axis of the piston rod 15 is greater than the cross-sectional area of ​​the second piston 14 perpendicular to the axis of the piston rod 15, so that the air pressure in the first air chamber 111 or the second air chamber 112 is relatively low, and the second piston 14 and the piston rod 15 can still be effectively driven to reciprocate, thereby reducing the pressure fluctuation amplitude in the total air chamber and reducing the possibility of explosion of the total air chamber due to excessive hydrogen pressure. In this embodiment, the cross-sectional area of ​​the first piston 13 perpendicular to the axis of the piston rod 15 and the cross-sectional area of ​​the second piston 14 perpendicular to the axis of the piston rod 15 are both circular, and the diameter of the first piston 13 is greater than the diameter of the second piston 14.

[0042] Specifically, the openings of the inlet valve 6 and the outlet valve 7 are adjustable so as to control the flow rate of hydrogen flowing from the total gas cavity into the hydrogen-using device, wherein the hydrogen-using device includes but is not limited to a hydrogen fuel cell.

[0043] Specifically, the air inlet valve 6 and the air outlet valve 7 are both electrically controlled air valves, so that the operator can remotely control the start and stop of this embodiment, reducing the risk of injury to the operator. In this embodiment, the air inlet valve 6 and the air outlet valve 7 are connected to the mobile terminal at the operator's location through a wired signal connection or a wireless signal connection, so that the operator can control the opening of the air inlet valve 6 and the air outlet valve 7 through the mobile terminal. The mobile terminal includes but is not limited to a mobile phone and a computer.

[0044] The present embodiment further includes a third gas valve 8, one end of which is connected to the exhaust port 34, and the third gas valve 8 is normally closed. When the gas pressure in the gasification chamber 31 is too high, the third gas valve 8 is opened to discharge the excess gas in the gasification chamber 31, and the pressure in the gasification chamber 31 is controlled within a safe range. In the present embodiment, the other end of the third gas valve 8 is connected to a hydrogen-using device to prevent the hydrogen concentration in the nearby air from increasing, resulting in an increased risk of explosion. In the present embodiment, hydrogen can flow in both directions in the third gas valve 8.

[0045] Specifically, the opening of the third gas valve 8 is adjustable to avoid excessive opening of the third gas valve 8 or excessive flow rate during hydrogen release, so as to avoid sparks or high temperature and reduce the risk of explosion.

[0046] Specifically, the third gas valve 8 is an explosion-proof valve, which further avoids sparks or high temperatures generated by excessive opening of the third gas valve 8 or excessive flow rate during hydrogen release, thereby reducing the risk of explosion.

[0047] Specifically, the third gas valve 8 is an electrically controlled gas valve, so that the operator can remotely control the start and stop of this embodiment, reducing the risk of injury to the operator. In this embodiment, the third gas valve 8 is connected to the mobile terminal at the operator's location through a wired signal connection or a wireless signal connection, so that the operator can control the opening of the third gas valve 8 through the mobile terminal. The mobile terminal includes but is not limited to a mobile phone and a computer.

[0048] Specifically, the gasification device 3 is equipped with a first pressure detection device, which is used to detect the pressure in the gasification chamber 31 in real time, so that the operator can adjust the opening of the third gas valve 8 according to the detection result of the first pressure detection device. The first pressure detection device is not shown in the figure.

[0049] Specifically, the first pressure detection device transmits the real-time pressure data in the vaporization chamber 31 to the mobile terminal at the operator's location through a wired signal connection or a wireless signal connection, so that the operator can obtain the real-time pressure data in the vaporization chamber 31 remotely, thereby reducing the risk of injury to the operator. The mobile terminal includes but is not limited to a mobile phone and a computer.

[0050] Specifically, the pumping assembly also includes a cylinder body 11 and a liquid cylinder body 12, the total air cavity is located in the cylinder body 11, and the total liquid cavity is located in the liquid cylinder body 12. The cylinder body 11 is located outside the cryogenic liquid storage tank 2, and the liquid cylinder body 12 is located inside the cryogenic liquid storage tank 2. The piston rod 15 is slidingly sealed with the cylinder body 11 and the liquid cylinder body 12. The piston rod 15 passes through the cryogenic liquid storage tank 2 and is slidingly sealed with the cryogenic liquid storage tank 2. In this embodiment, there is no solid medium between the cylinder body 11 and the liquid cylinder body 12 except the piston rod 15, which effectively reduces the heat transfer between the total air cavity and the total liquid cavity, and helps to improve the stability of liquid hydrogen in the cryogenic liquid storage tank 2 during liquid hydrogen pumping.

[0051] The working principle of the pressure balance assembly in this embodiment is to gasify part of the liquid hydrogen in the cryogenic liquid storage tank 2 and then send it back to the cryogenic liquid storage tank 2 .

[0052] In this embodiment, the pressure balance component is a return valve 9, and the opening of the return valve 9 is adjustable. A vent 35 is also provided at the top of the vaporization chamber 31, and the two ends of the return valve 9 are respectively connected to the vent 35 and the top of the cryogenic liquid storage tank 2. When the liquid hydrogen in the total liquid cavity flows into the vaporization device 3, the return valve 9 can be opened to replenish hydrogen into the cryogenic liquid storage tank 2, so that the pressure in the cryogenic liquid storage tank 2 is maintained within a safe range. The opening of the return valve 9 is dynamically adjusted based on the real-time pressure in the cryogenic liquid storage tank 2. In addition, when the second piston 14 moves, friction heat is generated by friction with the wall of the liquid hydrogen cavity. When the second piston 14 compresses the liquid hydrogen in the first liquid cavity 121 and the second liquid cavity 122, compression heat is generated. The liquid hydrogen in the cryogenic liquid storage tank 2 is partially vaporized due to the absorption of these friction heat and compression heat. When the pressure in the cryogenic liquid storage tank 2 is too high, the return valve 9 can also be opened to discharge the excess hydrogen in the cryogenic liquid storage tank 2. The hydrogen directly discharged from the cryogenic liquid storage tank 2 is heated by the vaporization chamber 31 and is not likely to affect the normal operation of hydrogen-using equipment due to too low a temperature.

[0053] Specifically, the cryogenic liquid storage tank 2 is provided with a second pressure detection device for detecting the internal pressure of the cryogenic liquid storage tank 2. The second pressure detection device is used to detect the pressure in the cryogenic liquid storage tank 2 in real time, so that the operator can adjust the opening of the return air valve 9 according to the detection result of the pressure detection device. The second pressure detection device is not shown in the figure.

[0054] Specifically, the second pressure detection device transmits the real-time pressure data in the cryogenic liquid storage tank 2 to the mobile terminal at the operator's location through a wired signal connection or a wireless signal connection, so that the operator can obtain the real-time pressure data in the cryogenic liquid storage tank 2 remotely, thereby reducing the risk of injury to the operator. The mobile terminal includes but is not limited to mobile phones and computers.

[0055] This embodiment further includes a liquid pipeline 101, which is provided with two inlets and one outlet. The two inlets of the liquid pipeline 101 are respectively connected to the two liquid outlet check valves 5, and the outlet of the liquid pipeline 101 is connected to the liquid delivery port 33. The liquid pipeline 101 passes through the cryogenic liquid storage tank 2 and is sealedly connected to the cryogenic liquid storage tank 2.

[0056] This embodiment also includes a first gas pipeline 102, which is provided with an inlet and three outlets. The inlet of the first gas pipeline 102 is connected to the exhaust port 34, and the four outlets of the first gas pipeline 102 are respectively connected to the two intake valves 6 and the third gas valve 8.

[0057] This embodiment further includes a second gas pipeline 103. The second gas pipeline 103 has two inlets and one outlet. The two inlets of the second gas pipeline 103 are respectively connected to the two gas outlet valves 7, and the outlet of the second gas pipeline 103 is connected to the hydrogen fuel cell.

[0058] Before the present embodiment is used, only liquid hydrogen and hydrogen exist in the entire self-driven cryogenic liquid booster pump. All inlet valves 6, all outlet valves 7, the third gas valve 8 and the gas return valve 9 are in a closed state, and the gasification device 3 is in a non-heating state.

[0059] When this embodiment is used, the operator controls the gasification device 3 to enter the heating state through the mobile terminal. The original hydrogen in the gasification chamber 31 is first heated and expanded, and when the inlet valve 6 of the first gas chamber 111 is opened and the outlet valve 7 of the first gas chamber 111 is closed, the hydrogen enters the first gas chamber 111 to push the first piston 13 to move downward. At this time, the inlet valve 6 of the second gas chamber 112 is closed, and the outlet valve 7 of the second gas chamber 112 is opened synchronously, and the hydrogen in the second gas chamber 112 is released, accelerating the downward movement of the first piston 13. When the outlet valve 7 of the second gas chamber 112 is closed and the inlet valve 6 of the second gas chamber 112 is opened, the excess hydrogen discharged from the gasification chamber 31 enters the second gas chamber 112 to push the first piston 13 to move upward. At this time, the inlet valve 6 of the first gas chamber 111 is closed, and the outlet valve 7 of the first gas chamber 111 is opened synchronously, and the hydrogen in the first gas chamber 111 is released, accelerating the upward movement of the first piston 13. In this embodiment, the first valve group is opened until the first piston 13 moves upward to the top of the total gas chamber, and then the first valve group is closed, and the second valve group is opened at the same time until the first piston 13 moves downward to the bottom of the total gas chamber. As the first valve group and the second valve group are alternately opened, the first piston 13 moves up and down, thereby driving the second piston 14 to move up and down in the total liquid chamber, and the liquid hydrogen in the cryogenic liquid storage tank 2 is continuously pumped to the vaporization chamber 31 and is vaporized into hydrogen. When the second piston 14 moves upward, the liquid hydrogen in the cryogenic liquid storage tank 2 enters the second liquid chamber 122 from the liquid inlet check valve 4 of the second liquid chamber 122, and the liquid hydrogen in the first liquid chamber 121 is discharged from the first liquid chamber 121 through the liquid outlet check valve 5. When the second piston 14 moves downward, the liquid hydrogen in the cryogenic liquid storage tank 2 enters the first liquid chamber 121 from the liquid inlet check valve 4 of the first liquid chamber 121, and the liquid hydrogen in the second liquid chamber 122 is discharged from the second liquid chamber 122 through the liquid outlet check valve 5 of the second liquid chamber 122. As the first valve group and the second valve group are opened alternately, the hydrogen in the vaporization chamber 31 continuously enters the total gas cavity as the driving force of the first piston 13, and then flows out from the gas outlet valve 7 and reaches the hydrogen fuel cell through the second gas pipeline 103. During this period, the operator also needs to open the return valve 9 to replenish or release hydrogen to the cryogenic liquid storage tank 2 to control the pressure value in the cryogenic liquid storage tank 2 to always be within a safe range. The opening of the return valve 9 is dynamically adjusted according to the real-time pressure of the cryogenic liquid storage tank 2 fed back by the pressure detection device. In addition, the operator also needs to adjust the opening of the third gas valve 8 according to the real-time pressure of the vaporization chamber 31 fed back by the first pressure detection device. When the pressure in the vaporization chamber 31 exceeds the safe range, the excess gas in the vaporization chamber 31 is released to the hydrogen fuel cell to control the pressure value in the vaporization chamber 31 to always be within a safe range.

[0060] In addition, the heating structure of the gasification device 3 can also be omitted, the two outlet valves 7 are opened, and the two inlet valves 6 are closed. The first piston 13 is driven to move by delivering hydrogen to one of the outlet valves 7, and part of the liquid hydrogen in the low-temperature liquid storage tank 2 is pumped into the gasification chamber 31. With the help of heat conducted to the gasification chamber 31 by normal temperature air, the liquid hydrogen is gasified into hydrogen, providing an initial driving force for the first piston 13, and then the first valve group and the second valve group are alternately opened to complete the pumping of the liquid hydrogen.

[0061] In view of the gas supply pressure and gas supply flow required by different types of hydrogen fuel cells, the parameters that need to be adjusted in this embodiment are: the area ratio between the cross-section of the first piston 13 perpendicular to the axis of the piston rod 15 and the cross-section of the second piston 14 perpendicular to the axis of the piston rod 15, the gasification rate of the gasification device 3, the time interval for alternating opening of the first valve group and the second valve group, and the opening and closing timing of the third gas valve 8.

[0062] In summary, this embodiment provides a piston pump that uses the gas form of a cryogenic liquid as a power source. The cryogenic liquid is compatible with its own gas form, which effectively reduces the risk of contamination during the cryogenic liquid pumping process. In addition, the cryogenic liquid is far below the boiling point of most substances, so that this embodiment can maintain a stable and efficient cryogenic liquid pumping efficiency in a low-temperature environment. At the same time, since the boiling point of the cryogenic liquid is extremely low, the energy required for its vaporization is also extremely low, which significantly reduces the energy consumption required to pump the cryogenic liquid. This embodiment can be used to pump liquids with a boiling point below minus 100°C. The pumped liquids include but are not limited to liquid hydrogen, liquid nitrogen, liquid helium, liquid neon, liquid argon and liquid oxygen.

[0063] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A self-driven cryogenic liquid booster pump, characterized in that: It comprises a pumping assembly and a gasification device (3); the pumping assembly comprises a total air chamber, a total liquid chamber, a first piston (13), a second piston (14) and a piston rod (15); the first piston (13) divides the total air chamber into a first air chamber (111) and a second air chamber (112); The second piston (14) divides the total liquid chamber into a first liquid chamber (121) and a second liquid chamber (122); The two ends of the piston rod (15) are respectively connected to the first piston (13) and the second piston (14); At least one of the first liquid chamber (121) and the second liquid chamber (122) is a liquid working chamber, and each liquid working chamber is provided with a liquid inlet check valve (4) and a liquid outlet check valve (5); the first gas chamber (111) and the second gas chamber (112) are provided with a gas inlet valve (6) and a gas outlet valve (7), and all the gas outlet valves (7) can be connected to a device using a cryogenic liquid in gas form; A gasification chamber (31) is provided in the gasification device (3), all liquid outlet one-way valves (5) can be communicated with the bottom of the gasification chamber (31), and all air inlet valves (6) can be communicated with the top of the gasification chamber (31).

2. A self-driven cryogenic liquid booster pump according to claim 1, characterized in that: The cross-sectional area of ​​the first piston (13) perpendicular to the axis of the piston rod (15) is greater than the cross-sectional area of ​​the second piston (14) perpendicular to the axis of the piston rod (15).

3. A self-driven cryogenic liquid booster pump according to claim 1 or 2, characterized in that: The first liquid chamber (121) and the second liquid chamber (122) are both liquid working chambers.

4. A self-driven cryogenic liquid booster pump according to claim 1 or 2, characterized in that: The air inlet valve (6) and the air outlet valve (7) are both electrically controlled air valves.

5. A self-driven cryogenic liquid booster pump according to claim 1 or 2, characterized in that: It also includes a third gas valve (8), the two ends of which are respectively connected to the top of the gasification device (3) and the equipment using low-temperature liquid gas form.

6. A self-driven cryogenic liquid booster pump according to claim 1 or 2, characterized in that: It also includes a cryogenic liquid storage tank (2) and a pressure balancing assembly, wherein the total gas cavity and the gasification device (3) are located outside the cryogenic liquid storage tank (2), and the total liquid cavity is located inside the cryogenic liquid storage tank (2). The pressure balancing assembly is used to transport cryogenic liquid or the gas form of cryogenic liquid into the cryogenic liquid storage tank (2) to maintain the pressure in the cryogenic liquid storage tank (2) stable.

7. A self-driven cryogenic liquid booster pump according to claim 1 or 2, characterized in that: The direction of the total air cavity and the total liquid cavity parallel to the axis of the piston rod is the length direction of the two. The liquid inlet check valve (4) and the liquid outlet check valve (5) are both arranged at the end of the total liquid cavity; the air inlet valve (6) and the air outlet valve (7) are both arranged at the end of the total air cavity.

8. A self-driven cryogenic liquid booster pump according to claim 1 or 2, characterized in that: The piston rod (15) is arranged vertically, and the total air cavity is located above the total liquid cavity.

9. A self-driven cryogenic liquid booster pump according to claim 1 or 2, characterized in that: The pumping assembly further comprises an air cylinder body (11) and a liquid cylinder body (12); the total air cavity is located in the air cylinder body (11), and the total liquid cavity is located in the liquid cylinder body (12); the piston rod (15) and the air cylinder body (11) and the liquid cylinder body (12) are all in sliding seal.

10. A self-driven cryogenic liquid booster pump according to claim 1 or 2, characterized in that: The gasification device (3) is also provided with a heating structure for heating the gasification chamber (31).

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