KR20220139074A - Cryogenic reciprocating pump for generating high pressure liquid using tension, and operating method thereof - Google Patents

Abstract

Disclosed are a cryogenic reciprocating pump for generating high pressure liquid using tension and an operating method thereof. The cryogenic reciprocating pump comprises: a first chamber, a space in which cryogenic liquid flows in from an inlet and is supercooled; a second chamber, a space which is disposed on the first chamber and in which the supercooled liquid that has flowed in from the first chamber is pressurized up to a target pressure and is emitted through an outlet; a rod which moves upward and downward inside the first chamber and the second chamber; a first piston which is connected to the rod, separates the first chamber into a lower end and an upper end, and adjusts the pressure of the first chamber and makes flowage according to a movement of the rod; a second piston which is connected to the rod, separates the second chamber into a lower end and an upper end, and adjusts the pressure of the second chamber and makes flowage according to the movement of the rod; and check valves which are opened and closed according to a pressure difference generated by the movement of the rod to form liquid flow from the inlet to the outlet. Liquid in the upper end of the second chamber is pressurized up to the target pressure while the rod is raised by tension. The present invention can reduce heat penetration through the outwardly extended rod.

Description

Cryogenic reciprocating pump for generating high-pressure liquid using tension and method of operation thereof

The present invention relates to a cryogenic reciprocating pump.

In the case of a conventional cryogenic reciprocating pump, a rod to which a piston/plunger is connected moves up and down in a liquid hydrogen chamber, and when the rod descends, the liquid hydrogen is compressed to a high pressure state. Therefore, in the prior art, in order to make a high-pressure liquid, since a compressive stress is repeatedly applied to a long-shaped rod, buckling is bent laterally than when a tensile stress of the same size is applied. increases the likelihood of the occurrence of To prevent this, a thick rod can be used, but heat transfer to the chamber through the cross-sectional area of the rod increases, and the heat capacity of the rod increases, thereby increasing the consumption of the cryogenic liquid at the beginning of the pump operation.

(Patent Document 1) KR20140098824 A

(Patent Document 2) US6722866 B

The present disclosure provides a cryogenic reciprocating pump for generating high-pressure liquid using tension and a method of operating the same.

The cryogenic reciprocating pump according to an embodiment includes a first chamber, which is a space in which a cryogenic liquid is introduced and supercooled from an inlet, and is disposed on the first chamber, and the supercooled liquid introduced from the first chamber is pressurized to a target pressure. A second chamber that is a space that is discharged to the outlet, a rod that moves up and down in the first chamber and the second chamber, is connected to the rod and separates the first chamber into a lower end and an upper end of the rod A first piston that adjusts the pressure of the first chamber according to movement and creates a flow, is connected to the rod and separates the second chamber into a lower end and an upper end, and adjusts the pressure of the second chamber according to the movement of the rod and a second piston for creating a flow, and check valves that open and close according to a pressure difference generated according to the movement of the rod to form a liquid flow from the inlet to the outlet. While the rod is raised by tension, the liquid at the top of the second chamber is pressurized to the target pressure.

While the rod is lowered by the pressing force, the liquid may move in the first chamber and the second chamber.

The check valves are disposed to connect the inlet and the lower end of the first chamber, and when a pressure difference between the inlet and the lower end of the first chamber occurs, a first check valve for introducing a liquid into the lower end of the first chamber, the first a second check valve disposed on the piston and configured to move liquid from the lower end of the first chamber to the upper end of the first chamber when a pressure difference between the lower end of the first chamber and the upper end of the first chamber occurs; a third check valve disposed to connect the lower ends of the second chamber and configured to move the liquid from the upper end of the first chamber to the lower end of the second chamber when a pressure difference between the upper end of the first chamber and the lower end of the second chamber occurs; a fourth check valve disposed on the second piston and configured to move liquid from a lower end of the second chamber to an upper end of the second chamber when a pressure difference between the lower end of the second chamber and the upper end of the second chamber occurs; and It may include a fifth check valve disposed to connect the upper end and the outlet, and for discharging the liquid from the upper end of the second chamber to the outlet when a pressure difference between the upper end of the second chamber and the outlet occurs.

While the rod is raised by tension, the first check valve, the third check valve, and the fifth check valve may be opened, and the second check valve and the fourth check valve may be closed.

The first check valve is opened when a pressure difference between the inlet and the lower end of the first chamber is generated by the raised first piston, and the liquid flows into the lower end of the first chamber. The third check valve opens when the upper end of the first chamber is pressed by the first piston and a pressure difference between the upper end of the first chamber and the lower end of the second chamber occurs, and the lower end of the second chamber from the upper end of the first chamber move the liquid to The fifth check valve opens when the liquid at the upper end of the second chamber is pressurized to the target pressure by the second piston and a pressure difference between the upper end of the second chamber and the outlet occurs, and the liquid is discharged to the outlet.

While the rod descends by the pressing force, the first check valve, the third check valve, and the fifth check valve may be closed, and the second check valve and the fourth check valve may be opened.

The second check valve opens when the upper end of the first chamber is compressed by the first piston and a pressure difference between the lower end of the first chamber and the upper end of the first chamber occurs, and the upper end of the first chamber from the lower end of the first chamber move the liquid to The fourth check valve opens when the lower end of the second chamber is compressed by the second piston and a pressure difference between the lower end of the second chamber and the upper end of the second chamber occurs, and the upper end of the second chamber from the lower end of the second chamber move the liquid to

The cryogenic liquid may be cryogenic liquid hydrogen.

The outlet may be connected to a high-pressure liquid hydrogen reservoir.

A cryogenic reciprocating pump according to another embodiment is a pressurized chamber, which is a space in which the introduced cryogenic liquid is pressurized to a target pressure and discharged to an outlet, a bar moving up and down in the pressurized chamber, and connected to the bar and connecting the pressurized chamber to the bottom and A piston for the pressure chamber that separates to the upper end and adjusts the pressure at the lower end and upper end of the pressurization chamber and creates a flow according to the movement of the rod, arranged to connect the liquid inlet point and the lower end of the pressurization chamber, the liquid inlet point and the When a pressure difference at the lower end of the pressurization chamber occurs, a first check valve for introducing a liquid into the lower end of the pressurization chamber is disposed in the piston for the pressurization chamber, and when a pressure difference between the lower end of the pressurization chamber and the upper end of the pressurization chamber occurs, the pressurization A second check valve for moving the liquid from the lower chamber to the upper end of the pressurization chamber, and disposed to connect the upper end of the pressurization chamber and the outlet, and when a pressure difference between the upper end of the pressurization chamber and the outlet occurs, the upper end of the pressurization chamber and a third check valve for discharging the liquid to the outlet. The outlet is located above the liquid inlet point. The first check valve, the second check valve and the third check valve are opened and closed to form a liquid flow from the liquid inlet point to the outlet direction.

While the rod rises, the first check valve opens and the second check valve closes, so that the lower end of the pressurization chamber is filled with liquid, and the third check valve pressurizes the liquid at the upper end of the pressurization chamber to the target pressure. to be opened when a pressure difference between the upper end of the pressurization chamber and the outlet occurs, and the liquid may be discharged to the outlet.

While the rod is lowered, the first check valve is closed and the second check valve is opened, so that the liquid filled at the lower end of the pressurization chamber moves to the upper end of the pressurization chamber, and the third check valve moves down the piston for the pressurization chamber By the expansion of the upper end of the pressure chamber may be closed when the pressure is lower than the outlet.

The cryogenic reciprocating pump is disposed below the pressurization chamber, a supercooling chamber into which a cryogenic liquid of normal pressure is introduced from an inlet and supercooled, is connected to the rod and separates the subcooling chamber into a lower end and an upper end, and according to the movement of the bar A piston for a supercooling chamber that regulates the pressure at the lower end and upper end of the subcooling chamber and creates a flow, and is disposed to connect the inlet and the lower end of the subcooling chamber, and when a pressure difference between the inlet and the lower end of the subcooling chamber occurs, the lower end of the subcooling chamber a fourth check valve for introducing a liquid, and a fourth check valve disposed on the piston for the supercooling chamber, and moving the liquid from the lower end of the supercooling chamber to the upper end of the supercooling chamber when a pressure difference between the lower end of the supercooling chamber and the upper end of the supercooling chamber occurs It may further include a check valve. The liquid inlet point may be located at the top of the subcooling chamber.

While the rod is rising, the fourth check valve is opened when a pressure difference between the inlet and the lower end of the supercooling chamber occurs by the piston for the subcooling chamber that is raised upward, and the liquid can be introduced into the lower end of the subcooling chamber. The fifth check valve may be closed by lowering the pressure at the upper end of the supercooling chamber than at the lower end of the supercooling chamber by the piston for the supercooling chamber. The third check valve may be opened when the upper end of the subcooling chamber is compressed by the piston for the subcooling chamber and the upper end of the pressurization chamber is expanded by the piston for the pressurization chamber to generate a pressure difference.

The cryogenic liquid may be cryogenic liquid hydrogen.

The cryogenic reciprocating pump according to the embodiment generates a high-pressure liquid by using tension and applies a compressive stress to the rod enough to generate flow, so buckling occurs compared to the technology to create a high-pressure liquid by applying a large compressive stress to the rod can lower the chances.

Cryogenic reciprocating pump according to the embodiment can use a relatively thin rod compared to the prior art, it is possible to reduce the heat penetration through the rod extending to the outside.

The cryogenic reciprocating pump according to the embodiment has the inlet below, so it can operate at low water levels in cryogenic liquid reservoirs.

1 is a structural diagram of a cryogenic reciprocating pump according to an embodiment.
FIG. 2 is a view for explaining the operation of a cryogenic reciprocating pump during rod lifting according to one embodiment.
3 is a view for explaining the operation of the cryogenic reciprocating pump during rod lowering according to one embodiment.
4 is a conceptual diagram of a hydrogen supply system according to an embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art to which the present invention pertains can easily implement them. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

First, let's look at the prior art.

The cryogenic reciprocating pump developed by Linde, Germany, is a double acting piston and plunger structure. The rod connected with the piston/plunger moves up and down the first chamber into which the liquid flows and the second chamber where the liquid is pressurized. Creates a high-pressure liquid. Looking at the specific operation, when the rod comes down, the external liquid enters the upper part of the first chamber, and the liquid in the lower part of the first chamber is pressurized to become a supercooled state, and when the pressure reaches a certain level, the supercooled liquid enters the second chamber It is injected to the top, and the liquid at the bottom of the second chamber is pressurized to a target pressure. When the rod is raised, the liquid at the upper end of the first chamber flows into the lower end, and the liquid in the supercooled state at the upper end of the second chamber flows into the lower end of the second chamber.

Referring to Patent Document 1 of Cryostar SAS in France, the liquid entering the chamber enters the pressurized space and the liquid is pressurized through the plunger.

As such, the prior art repeatedly applies a compressive stress to a long rod in order to make a high-pressure liquid, so that buckling is bent laterally than when a tensile stress of the same size is applied. ) is more likely to occur. To prevent this, a thick rod can be used, but heat transfer to the chamber through the cross-sectional area of the rod increases, and the heat capacity of the rod increases, thereby increasing the consumption of the cryogenic liquid at the beginning of the pump operation.

In the case of Patent Document 2, the flow of liquid inflow, pressurization, and movement is made by using the tension applied to the rod and the spring restoring force.

In order to solve the problems of the prior art, the cryogenic reciprocating pump of the present disclosure has a structure for generating a high-pressure liquid using tension, which will be described in detail below. In the present disclosure, the cryogenic liquid is pressurized by a cryogenic reciprocating pump, and as the cryogenic liquid, liquid hydrogen of about 20K can be described as an example.

1 is a structural diagram of a cryogenic reciprocating pump according to an embodiment.

Referring to FIG. 1 , the cryogenic reciprocating pump 100 is a device for increasing the pressure of a cryogenic liquid, and receives a cryogenic liquid (eg, atmospheric liquid) and pressurizes it to high pressure (eg, 900 bar) cryogenic liquid emits For this purpose, the cryogenic reciprocating pump 100 is disposed on the first chamber 110, which is a space in which the cryogenic liquid introduced from the outside is supercooled, and the first chamber 110 and the liquid in the supercooled state introduced from the first chamber is targeted. The second chamber 120, which is a space that is pressurized to pressure, a rod 150 that moves up and down in the first chamber 110 and the second chamber, is connected to the rod 130, and is connected to the movement of the rod 130. The first piston 140, which adjusts the pressure of the first chamber 110 and creates a flow, is connected to the rod 130, and according to the movement of the rod 130, the pressure of the second chamber 120 is adjusted and the flow is controlled. Five check valves 161 and 162 that open and close according to the pressure difference generated by the movement of the second piston 150 and the rod 130 to form a liquid flow from the inlet to the outlet. , 163 , 164 , and 165 , and consists of a housing 170 that surrounds and supports them. The second chamber 120 has a narrower space than the first chamber 110 in order to compress the liquid. The rod 130 extends to the outside of the cryogenic reciprocating pump 100 , and reciprocates by an external actuator 200 . An inlet of the cryogenic reciprocating pump 100 is connected to the bottom surface of the first chamber 110 through a check valve 161, and an outlet is connected to the second chamber 120 through a check valve 165. connected to the top surface of The inlet may be immersed in a cryogenic liquid reservoir at atmospheric pressure, or may be connected to a cryogenic liquid reservoir at atmospheric pressure. An outlet may be connected to a cryogenic liquid reservoir near the target high pressure.

In addition, an insulator for preventing heat intrusion to the cryogenic reciprocating pump 100 may be added. A dynamic seal may be added to the cryogenic reciprocating pump 100 to prevent leakage that may occur in the moving parts of the rod. A device for reliquefying the leaked gas or a device for transporting the leaked gas to a separate gas reservoir may be added to the cryogenic reciprocating pump 100 . At least one of the first piston 140 and the second piston may be replaced with a plunger.

The cryogenic reciprocating pump 100 divides and pressurizes the liquid introduced through the first chamber 110 and the second chamber 120 in two stages. Since cryogenic liquids are generally stored in a saturated liquid state, they evaporate easily even by small heat intrusion or flow. If the liquid evaporates inside the pump during pump operation, the overall specific volume increases and the volumetric efficiency after compression may decrease. Accordingly, the cryogenic reciprocating pump 100 slightly pressurizes the saturated liquid introduced from the outside in the first chamber 110 to make it supercooled, and the supercooled liquid is transferred to the second chamber 120 at a target high pressure (for example, For example, proceed with a two-step pressurization to make 900 bar). Accordingly, the first chamber 110 may be referred to as a supercooling chamber, and the second chamber 120 may be referred to as a pressure chamber.

The range of motion of the rod 130 may be determined according to the chamber capacity and pressure, and according to the design, the rod 130 is designed so that at least one of the first piston 140 and the second piston 150 reaches the upper surface of the chamber. You can climb until you reach a certain height, or you can climb up to a specified maximum height. Also, depending on the design, the rod 130 may descend until at least one of the first piston 140 and the second piston 150 reaches the bottom surface of the corresponding chamber, or may descend to a specified lowest height.

The first piston 140 and the second piston 150 serve to adjust the pressure of the liquid in each chamber and create a flow according to the movement of the rod 130 . The first piston 140 moves up and down in the first chamber 110 according to the movement of the rod 130 , and divides the inside of the first chamber 110 into a lower end (A) and an upper end (B). The volume of the lower end (A) and the upper end (B) separated by the first piston 140 varies according to the movement of the rod 130 . The second piston 150 moves up and down in the second chamber 120 according to the movement of the rod 130 , and divides the inside of the second chamber 120 into a lower end (C) and an upper end (D). The volume of the lower end (C) and the upper end (D) separated by the second piston 150 varies according to the movement of the rod 130 .

The five check valves 161 , 162 , 163 , 164 , and 165 are valves that allow the liquid to flow in only one direction, and can make a flow only in the direction from the lower inlet to the upper outlet. The five check valves open when a pressure differential occurs in one predetermined direction, and close otherwise.

The check valve 161 is disposed to connect the inlet and the lower end of the first chamber 110 , and creates a fluid flow that introduces an external liquid into the lower end A of the first chamber 110 . The check valve 162 is disposed on the first piston 140 moving in the first chamber 110 , and makes a fluid flow from the lower end (A) to the upper end (B) of the first chamber 110 . The check valve 163 is disposed to connect the upper end (B) of the first chamber 110 and the lower end (C) of the second chamber 120 , and the second chamber 120 at the upper end (B) of the first chamber 110 . Create a fluid flow to the bottom (C). The check valve 164 is disposed on the second piston 150 moving in the second chamber 120 , and makes a fluid flow from the lower end (C) to the upper end (D) of the second chamber 120 . The check valve 165 is disposed to connect the upper end (D) and the outlet of the second chamber 120, and makes a fluid flow for discharging the high-pressure liquid of the upper end (D) of the second chamber 120 to the outlet.

When the driving device 200 applies a tensile stress to the rod 130 , the rod 130 rises upward by a pulling force (tension). While the rod is raised, the check valve 162 and the check valve 164 are closed, and the check valve 161, the check valve 163 and the check valve 165 are opened to create a fluid flow. The external liquid entering through the check valve 161 fills the lower end (A) of the first chamber 110, and the liquid at the upper end (B) of the first chamber 110 through the check valve 163 flows into the second chamber ( 120) moves to the lower end (C), and the high-pressure liquid pressurized by the second piston 150 at the upper end (D) of the second chamber 120 is discharged to the outlet through the check valve 165 .

When the driving device 200 applies a compressive stress to the rod 130 , the rod 130 comes down from the top by the pressing force (pressure). While the rod is lowered, the check valve 161 , the check valve 163 and the check valve 165 close, and the check valve 162 and the check valve 164 open to create a fluid flow. The liquid at the lower end (A) of the first chamber 110 through the check valve 162 moves to the upper end (B), and the liquid at the lower end (C) of the second chamber 120 through the check valve 164 moves to the upper end ( Go to D).

As such, liquid is pressurized as the rod 130 rises upward, and liquid movement from the bottom to the top of each chamber occurs as the rod 130 descends. Therefore, the cryogenic reciprocating pump 100 generates a high-pressure liquid by using tension, and applies a compressive stress to the rod 130 enough to generate a flow. There is less possibility of buckling that is bent sideways compared to that. As a result, the cryogenic reciprocating pump 100 may use a relatively thin rod 130 compared to the prior art, and thus may reduce heat intrusion through the rod extending to the outside. In addition, the cryogenic reciprocating pump 100 has an inlet down, so it can operate at low water levels in cryogenic liquid reservoirs. Thus, the minimum requirement to be stored in the cryogenic liquid reservoir can be reduced.

In the following, the operation of the cryogenic reciprocating pump 100 will be described in detail.

FIG. 2 is a view for explaining the operation of the cryogenic reciprocating pump during rod raising according to an embodiment, and FIG. 3 is a view for explaining the operation of the cryogenic reciprocating pump during lowering of the rod according to one embodiment.

Referring to (a) of FIG. 2 , as a state in which the bar 130 has descended to the lowest point specified by the pressing pressure, this may be defined as a rising start state. In the rising start state, the volume of the upper end (B) of the first chamber 110 and the upper end (D) of the second chamber 120 is the maximum. At this time, the lower end (A) of the first chamber 110 is compressed higher than the inlet pressure (normal pressure) by the first piston 140, and the check valve 161 is closed. The lower end (C) of the second chamber 120 is compressed by the second piston 150, the upper end (B) of the first chamber 110 is expanded by the first piston 140, and the check valve 163 is Closed. The upper end (D) of the second chamber 120 is expanded by the second piston 150, and the check valve 165 is closed. The check valve 162 may be opened or closed depending on whether the pressure of the lower end (A) and the upper end (B) of the first chamber 110 is balanced. The check valve 162 may be opened or closed depending on whether the pressure of the lower end (C) and the upper end (D) of the second chamber 120 is balanced.

Referring to (b), when tension is applied to the rod 130 that has come down to the lowest point, the rod 130 rises upward by the tension. Then, the liquid at the upper end (B) of the first chamber 110 is pressurized by the first piston 140 to be in a supercooled state, and the second chamber 120 lower end ( Go to C). When the liquid in the upper end (D) of the second chamber 120 is pressurized to the target pressure by the second piston 150, it is discharged to the outlet through the check valve 165 opened by the pressure difference. On the other hand, when the first piston 140 connected to the rod 130 rises, the volume of the lower end A of the first chamber 110 increases, and the check valve 161 is opened by the pressure difference with the inlet. Then, the cryogenic liquid is introduced into the lower end (A) of the first chamber (110).

Meanwhile, while the rod 130 rises, the internal structure is designed so that the upper end of the chamber separated by each piston is maintained at a higher pressure than the lower end, so that the check valve 162 and the check valve 164 are closed.

When the rod 130 rises to the specified highest point, the force applied to the rod 130 is converted from tension to pressing pressure.

Referring to FIG. 3 (a), in FIG. 2 (b), the bar 130 is positioned at the highest point designated by tension, which can be defined as a descending start state. When the rod 130 rises to the specified highest point, the force applied to the rod 130 is converted from tension to pressing pressure.

Referring to (b) of Figure 3, when pressure is applied to the rod 130 that has risen to the highest point, the rod 130 is gradually lowered by the pressure. Then, the upper end (D) of the second chamber 120 is expanded by the second piston 150, the pressure is lowered, and the check valve 165 is closed by the pressure difference with the outlet.

As the lower end (C) of the second chamber (120) is compressed by the second piston (150), the check valve (164) is opened, and the liquid at the lower end (C) of the second chamber (120) is passed through the open check valve (164). The second chamber 120 moves to the upper end (D).

As the upper end (B) of the first chamber 110 is compressed by the first piston 140 , the check valve 162 is opened, and the liquid in the lower end (A) of the first chamber 110 is discharged through the open check valve 162 . The first chamber 110 moves to the upper end (B).

On the other hand, while the rod 130 is lowered, the pressure difference between the lower end (A) and the inlet of the first chamber 110 so that the check valve 161 and the check valve 163 are closed, the upper end of the first chamber 110 (B) and the second chamber 120, the internal structure is designed so that the pressure difference between the lower end (C) occurs.

As shown in (a) of Figure 2, when the rod 130 comes down to the designated lowest point, the force applied to the rod 130 is converted into tension, and as shown in Figure 2 (b), outputting a high-pressure liquid goes to

4 is a conceptual diagram of a hydrogen supply system according to an embodiment.

Referring to FIG. 4 , it is effective to store hydrogen as cryogenic liquid hydrogen rather than gaseous hydrogen at room temperature. Therefore, the hydrogen refueling station stores liquid hydrogen in a liquid hydrogen storage (10), and an evaporator (11) that vaporizes the liquid hydrogen and a hydrogen dispenser (12) through a hydrogen vehicle ( 20) to supply liquid hydrogen.

Liquid hydrogen has higher volumetric efficiency than gaseous hydrogen because of its higher density. In addition, since hydrogen used in a hydrogen vehicle must be of high purity, it is necessary to remove impurities such as moisture or dust when gaseous hydrogen is used. However, when liquid hydrogen is vaporized and injected into a hydrogen vehicle, impurities are removed during the hydrogen liquefaction process, so a separate high-purity operation required when using gaseous hydrogen is not required. Accordingly, the hydrogen supply process using liquid hydrogen is simplified.

On the other hand, the hydrogen vehicle 20 accommodates hydrogen at a pressure of 350 bar to 700 bar. In order to supply hydrogen using the pressure difference at the hydrogen filling station, high-pressure liquid hydrogen (for example, 900 bar) higher than 700 bar is used. It should be stored in the liquid hydrogen storage (10). A liquid hydrogen pump supplies high-pressure liquid hydrogen to the liquid hydrogen reservoir 10 , a cryogenic reciprocating pump 100 may be used.

The cryogenic reciprocating pump 100 is the cryogenic reciprocating pump 100 is supplied with liquid hydrogen at atmospheric pressure from the liquid hydrogen Dewar 300 , and high-pressure liquid hydrogen of 900 bar can be discharged to the liquid hydrogen storage 10 . The inlet (inlet) of the cryogenic reciprocating pump 100 may be immersed in the liquid hydrogen dewar 300 or may be supplied with liquid hydrogen from the liquid hydrogen dewar 300 .

In addition to hydrogen refueling stations, the cryogenic reciprocating pump 100 can be used to transport cryogenic liquids, and can transport cryogenic liquids to high ground.

The embodiment of the present invention described above is not implemented only through the apparatus and method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention or a recording medium in which the program is recorded.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto. is within the scope of the right.

Claims (15)

The first chamber is a space in which cryogenic liquid is introduced from the inlet and is supercooled;
a second chamber disposed above the first chamber, a space in which the supercooled liquid introduced from the first chamber is pressurized to a target pressure and discharged to an outlet;
a rod moving up and down in the first chamber and the second chamber;
a first piston connected to the rod and separating the first chamber into a lower end and an upper end, adjusting the pressure of the first chamber according to the movement of the rod and creating a flow;
a second piston connected to the rod and separating the second chamber into a lower end and an upper end, and adjusting the pressure of the second chamber according to the movement of the rod and creating a flow; and
Includes check valves that open and close according to a pressure difference generated according to the movement of the rod to form a liquid flow from the inlet to the outlet,
while the rod is raised by tension, the liquid at the top of the second chamber is pressurized to the target pressure. In claim 1,
A cryogenic reciprocating pump, wherein liquid moves in the first chamber and the second chamber while the rod is lowered by the pressing force. In claim 1,
The check valves are
a first check valve disposed to connect the inlet and the lower end of the first chamber, and for introducing a liquid into the lower end of the first chamber when a pressure difference between the inlet and the lower end of the first chamber occurs;
a second check valve disposed on the first piston and configured to move the liquid from the lower end of the first chamber to the upper end of the first chamber when a pressure difference between the lower end of the first chamber and the upper end of the first chamber occurs;
It is disposed to connect the upper end of the first chamber and the lower end of the second chamber, and when a pressure difference between the upper end of the first chamber and the lower end of the second chamber occurs, the liquid is moved from the upper end of the first chamber to the lower end of the second chamber 3rd check valve,
a fourth check valve disposed on the second piston and configured to move the liquid from the lower end of the second chamber to the upper end of the second chamber when a pressure difference between the lower end of the second chamber and the upper end of the second chamber occurs; and
a fifth check valve disposed to connect the upper end of the second chamber and the outlet, and for discharging the liquid from the upper end of the second chamber to the outlet when a pressure difference between the upper end of the second chamber and the outlet occurs
Including, cryogenic reciprocating pump. In claim 3,
While the rod is raised by tension, the first check valve, the third check valve and the fifth check valve are opened, and the second check valve and the fourth check valve are closed, the cryogenic reciprocating pump. In claim 4,
The first check valve is opened when a pressure difference between the inlet and the lower end of the first chamber is generated by the first piston raised upward, and the liquid flows into the lower end of the first chamber,
The third check valve opens when the upper end of the first chamber is pressed by the first piston and a pressure difference between the upper end of the first chamber and the lower end of the second chamber occurs, and the lower end of the second chamber from the upper end of the first chamber move the liquid to
The fifth check valve opens when the liquid at the upper end of the second chamber is pressurized to the target pressure by the second piston and a pressure difference between the upper end of the second chamber and the outlet occurs, and discharges the liquid to the outlet, Cryogenic reciprocating pump. In claim 3,
While the rod is lowered by the pressing force, the first check valve, the third check valve and the fifth check valve are closed, and the second check valve and the fourth check valve are opened, a cryogenic reciprocating pump. In claim 6,
The second check valve opens when the upper end of the first chamber is compressed by the first piston and a pressure difference between the lower end of the first chamber and the upper end of the first chamber occurs, and the upper end of the first chamber from the lower end of the first chamber move the liquid to
The fourth check valve opens when the lower end of the second chamber is compressed by the second piston and a pressure difference between the lower end of the second chamber and the upper end of the second chamber occurs, and the upper end of the second chamber from the lower end of the second chamber A cryogenic reciprocating pump that moves liquid into In claim 1,
The cryogenic liquid is cryogenic liquid hydrogen, cryogenic reciprocating pump. In claim 8,
and the outlet is connected to a high-pressure liquid hydrogen reservoir. A pressurized chamber, a space in which the introduced cryogenic liquid is pressurized to the target pressure and discharged to the outlet;
a rod moving up and down within the pressure chamber;
A piston for a pressure chamber connected to the rod and separating the pressure chamber into a lower end and an upper end, and adjusts the pressure at the lower end and upper end of the pressurization chamber according to the movement of the rod and creates a flow;
A first check valve disposed to connect the liquid inlet point and the lower end of the pressurization chamber, and when a pressure difference between the liquid inlet point and the lower end of the pressurization chamber occurs, the liquid flows into the lower end of the pressurization chamber;
A second check valve disposed on the piston for the pressure chamber, and for moving the liquid from the lower end of the pressurization chamber to the upper end of the pressurization chamber when a pressure difference between the lower end of the pressurization chamber and the upper end of the pressurization chamber occurs, and
and a third check valve disposed to connect the upper end of the pressurization chamber and the outlet, and for discharging the liquid from the upper end of the pressurization chamber to the outlet when a pressure difference between the upper end of the pressurization chamber and the outlet occurs,
The outlet is located at a point higher than the liquid inlet point,
wherein the first check valve, the second check valve and the third check valve open and close to form a liquid flow from the liquid inlet point to the outlet direction. In claim 10,
While the rod is rising, the first check valve is opened and the second check valve is closed, so that the lower end of the pressure chamber is filled with liquid,
The third check valve opens when the liquid at the upper end of the pressurization chamber is pressurized to the target pressure and a pressure difference between the upper end of the pressurization chamber and the outlet occurs, and discharges the liquid to the outlet, a cryogenic reciprocating pump. In claim 11,
While the rod is lowered, the first check valve is closed and the second check valve is opened, so that the liquid filled at the lower end of the pressurization chamber moves to the upper end of the pressurization chamber,
The third check valve is a cryogenic reciprocating pump, which is closed when the pressure at the top of the pressure chamber is expanded by the piston for the pressure chamber going down and the pressure is lower than the outlet. In claim 10,
A supercooling chamber disposed below the pressurization chamber, in which a cryogenic liquid at atmospheric pressure is introduced from the inlet and supercooled;
A piston for the subcooling chamber that is connected to the rod and separates the subcooling chamber into a lower end and an upper end, and adjusts the pressure at the lower end and upper end of the subcooling chamber according to the movement of the bar and creates a flow;
a fourth check valve disposed to connect the inlet and the lower end of the subcooling chamber, and for introducing a liquid into the lower end of the subcooling chamber when a pressure difference between the inlet and the lower end of the subcooling chamber occurs; and
A fourth check valve disposed on the piston for the supercooling chamber and moving the liquid from the lower end of the supercooling chamber to the upper end of the supercooling chamber when a pressure difference between the lower end of the supercooling chamber and the upper end of the supercooling chamber occurs,
and the liquid inlet point is located above the subcooling chamber. In claim 13,
While the bar is rising, the fourth check valve is opened when a pressure difference between the inlet and the lower end of the subcooling chamber occurs by the piston for the subcooling chamber that rises upward, and the liquid flows into the lower end of the subcooling chamber,
The fifth check valve is closed by lowering the pressure at the upper end of the supercooling chamber than at the lower end of the supercooling chamber by the piston for the subcooling chamber,
The third check valve is, the upper end of the subcooling chamber is compressed by the piston for the subcooling chamber and the upper end of the pressurization chamber is expanded by the piston for the pressurization chamber to open when a pressure difference occurs. In claim 10,
The cryogenic liquid is cryogenic liquid hydrogen, cryogenic reciprocating pump.

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