Liquid hydrogen pump

Abstract

The present disclosure relates to a liquid hydrogen pump, comprising a pump cylinder, a first piston assembly and a second piston assembly. The pump cylinder comprises an annular body and a pump cavity arranged in the annular body, the pump cavity has a first end and a second end in the extension direction thereof. The first piston assembly comprises a first piston rod movably arranged in the pump cavity from the first end thereof and a first piston arranged in the pump cavity and connected with the first piston rod. The second piston assembly comprises a second piston rod movably arranged in the pump cavity from the second end thereof and a second piston connected with the second piston rod and arranged in the pump cavity. The first piston assembly and the second piston assembly are configured to enable the first piston and the second piston to move towards or away from each other along the extension direction of the pump cavity, so as to change the working volume of the pump cavity. When the length of the pump cavity is relatively long, the length of the first piston rod and the second piston rod can be shortened, the strength requirement of the first piston rod and the second piston rod can be reduced, and the manufacturing difficulty can be reduced.

Description

Technical Field

[0001] This disclosure relates to the field of liquid hydrogen transport equipment technology, and more specifically, to a liquid hydrogen pump. Background Technology

[0002] Piston pumps can be used as liquid hydrogen pumps for the transportation, filling, or transfer of liquid hydrogen. When the liquid hydrogen pump is a high-flow-rate pump, it usually needs to have a large volume, that is, a large pump chamber. The volume of the pump chamber can be increased by increasing the diameter of the pump chamber or lengthening the extension length of the pump chamber. When the volume of the liquid hydrogen pump is increased by lengthening the extension length of the pump chamber, the piston stroke is lengthened, resulting in a longer piston rod. This places higher demands on the strength of the piston rod and increases the manufacturing difficulty of the piston rod. Summary of the Invention

[0003] The purpose of this disclosure is to provide a liquid hydrogen pump that reduces the piston stroke, thereby reducing the length of the piston rod, lowering the strength requirements of the piston rod, and reducing the manufacturing difficulty of the piston rod.

[0004] To achieve the above objectives, this disclosure provides a liquid hydrogen pump, comprising: A pump cylinder includes an annular body and a pump chamber disposed within the annular body, the pump chamber having a first end and a second end in its extending direction; The first piston assembly includes a first piston rod movably passing through the pump chamber from the first end and a first piston connected to the first piston rod and disposed in the pump chamber; and The second piston assembly includes a second piston rod movably passing through the pump chamber from the second end and a second piston connected to the second piston rod and disposed in the pump chamber; The first piston assembly and the second piston assembly are configured to allow the first piston and the second piston to move closer to or further away from each other along the extension direction of the pump chamber, thereby changing the working volume of the pump chamber.

[0005] Optionally, the pump chamber extends along a first direction, with the first end and the second end located at opposite ends of the pump chamber in the first direction, and the first piston and the second piston being able to move closer to or further away from each other along the first direction.

[0006] Optionally, the liquid hydrogen pump includes a first drive assembly and a second drive assembly. The first drive assembly is drivenly connected to the first piston rod and is used to drive the first piston rod and the first piston to move along the extension direction of the pump chamber. The second drive assembly is drivenly connected to the second piston rod and is used to drive the second piston rod and the second piston to move along the extension direction of the pump chamber.

[0007] Optionally, the first drive assembly is configured as a first hydraulic cylinder, the piston rod of the first hydraulic cylinder is configured as the first piston rod, and the end of the first piston rod away from the first piston is connected to a third piston of the first hydraulic cylinder; and / or The second drive assembly is configured as a second hydraulic cylinder, the piston rod of the second hydraulic cylinder is configured as a second piston rod, and the end of the second piston rod away from the second piston is connected to the fourth piston of the second hydraulic cylinder.

[0008] Optionally, the ratio of the cross-sectional areas of the first piston and the third piston is 1:3.5; and / or The ratio of the cross-sectional area of ​​the second piston to that of the third piston is 1:3.5.

[0009] Optionally, the first drive component is configured as a first electric cylinder; and / or The second drive component is configured as a second electric cylinder.

[0010] Optionally, the annular body is provided with a first liquid inlet communicating with the pump chamber, and the first liquid inlet is provided with a first one-way valve for allowing liquid hydrogen to flow into the pump chamber; and The annular body is provided with a first liquid outlet communicating with the pump chamber, and the first liquid outlet is provided with a second one-way valve for allowing liquid hydrogen to flow out of the pump chamber.

[0011] Optionally, the annular body includes an outer cylinder and an inner cylinder disposed within the outer cylinder. The pump chamber is formed in the inner cylinder. A pump pool for containing liquid hydrogen is provided between the inner cylinder and the outer cylinder. The outer cylinder is provided with a second inlet and a second outlet communicating with the pump pool. A first flow regulating valve is provided on the second inlet, and a second flow regulating valve is provided on the second outlet. The first inlet is located in the inner cylinder and is used to communicate with the pump pool and the pump chamber. The first outlet is located in the inner cylinder and extends out of the outer cylinder at one end away from the pump chamber.

[0012] Optionally, a support frame is provided in the pump pool, and the support frame is connected to the outer cylinder and the inner cylinder respectively to support the inner cylinder.

[0013] Optionally, two interlayers are formed between the outer wall and the inner wall of the outer cylinder for heat insulation of the pump pool; The layer closest to the inner wall of the outer cylinder is a vacuum interlayer, while the layer furthest from the inner wall of the outer cylinder is a liquid nitrogen interlayer.

[0014] Through the above technical solution, the first piston and the second piston are movably disposed in the pump chamber. The first piston rod movably passes through the first end of the pump chamber and is connected to the first piston disposed in the pump chamber. The second piston rod movably passes through the second end of the pump chamber and is connected to the second piston disposed in the pump chamber. The first piston assembly and the second piston assembly are configured to allow the first piston and the second piston to move closer to or further away from each other along the extension direction of the pump chamber, thereby changing the working volume of the pump chamber and thus realizing the delivery of liquid hydrogen by the liquid hydrogen pump. Through the above arrangement, using two pistons moving closer to or further away from each other along the extension direction of the receiving chamber to achieve the delivery of liquid hydrogen, compared with single piston compression, when compressing the working volume in the pump chamber to the same volume, the arrangement of two pistons shortens the piston's stroke, thereby shortening the length of the first piston rod and the second piston rod, and thus reducing the strength requirements of the first piston rod and the second piston rod.

[0015] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a simplified cross-sectional view of a liquid hydrogen pump provided in an exemplary embodiment of this disclosure; Figure 2 This is a simplified structural diagram of a liquid hydrogen pump driven by a hydraulic station according to an exemplary embodiment of this disclosure; Figure 3 This is a simplified cross-sectional view of a liquid hydrogen pump provided in yet another exemplary embodiment of this disclosure; Figure 4 This is a schematic diagram of the structure of the bracket provided in an exemplary embodiment of this disclosure.

[0017] Explanation of reference numerals in the attached figures 10-Pump cylinder; 11-Annular body; 111-Outer cylinder; 1111-Vacuum jacket; 1112-Liquid nitrogen jacket; 1113-Second inlet; 1114-Second outlet; 112-Inner cylinder; 1121-First inlet; 1122-First outlet; 12-Pump pool; 13-Pump chamber; 13a-First end; 13b-Second end; 20-First piston assembly; 21-First piston rod; 22-First piston; 30-Second piston assembly; 31-Second piston rod; 32-Second piston; 40-First drive assembly; 41-First hydraulic cylinder; 411-Third piston; 41a-First oil port; 41b-Second oil port; 42-First electric cylinder; 421-First drive rod; 50-Second drive assembly; 51-Second hydraulic cylinder; 511-Fourth piston; 51a-Third oil port; 51b-Fourth oil port; 52-Second electric cylinder; 521-Second drive rod; 60-Hydraulic station; 61-Oil tank; 62-Hydraulic pump; 63-Reversing valve; 64-Main oil inlet circuit; 65-Main oil return circuit; 70-First guide assembly; 71-First guide cylinder; 72-First drive piston; 80-Second guide assembly; 81-Second guide cylinder; 82-Second drive piston; 90-First check valve; 100-Second check valve; 200-Bracket; 201-Clamping part; 202-Support part; 300-First flow regulating valve; 400-Second flow regulating valve; 500-First oil circuit; 600-Second oil circuit; 700-Third oil circuit; 800-Fourth oil circuit; A-First working oil port; B-Second working oil port; P-Oil inlet; T-Oil return port. Detailed Implementation

[0018] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0019] In this disclosure, an X direction is defined for the liquid hydrogen pump, and the X direction is the first direction. Unless otherwise stated, directional terms such as "inner" and "outer" refer to the inner and outer contours relative to the outline of the component or structure itself. Furthermore, it should be noted that terms such as "first" and "second" are used to distinguish one element from another and do not have sequential or importance implications. Additionally, in the description with reference to the accompanying drawings, the same reference numerals in different drawings denote the same elements.

[0020] The inventors discovered that when a liquid hydrogen pump is to achieve a large flow rate of liquid hydrogen, it usually needs to have a large volume, that is, a large pump chamber volume. The volume of the pump chamber can be increased by increasing the diameter of the pump chamber or lengthening the extension length of the pump chamber. When the volume of the liquid hydrogen pump is increased by lengthening the extension length of the pump chamber, the piston stroke is lengthened, resulting in a longer piston rod. In order to prevent the piston rod from deforming during the operation of the liquid hydrogen pump, the piston rod usually needs to have high strength, which increases the manufacturing difficulty of the piston rod.

[0021] This disclosure provides a liquid hydrogen pump, such as Figures 1 to 4 As shown, the pump assembly includes a pump cylinder 10, a first piston assembly 20, and a second piston assembly 30. The pump cylinder 10 includes an annular body 11 and a pump chamber 13 disposed within the annular body 11. The pump chamber 13 has a first end 13a and a second end 13b in its extending direction. The first piston assembly 20 includes a first piston rod 21 and a first piston 22. The first piston rod 21 is movably inserted through the pump chamber 13 from its first end 13a, and the first piston 22 is disposed in the pump chamber 13 and connected to the first piston rod 21. The second piston assembly 30 includes a second piston rod 31 movably inserted through the pump chamber 13 from its second end 13b and a second piston 32 connected to the second piston rod 31 and disposed in the pump chamber 13. The first piston assembly 20 and the second piston assembly 30 are configured to allow the first piston 22 and the second piston 32 to move closer to or further away from each other along the extending direction of the pump chamber 13, thereby changing the working volume of the pump chamber 13 and realizing the liquid hydrogen pump's suction and discharge.

[0022] In the above embodiments, when the working volume in the pump chamber 13 needs to reach the preset working volume, compared to using the movement of a single piston to reach the preset working volume, by relying on the way the first piston 22 and the second piston 32 move closer or further away from each other in the extension direction of the pump chamber 13, the movement stroke of the first piston 22 and the second piston 32 can be shortened. When the movement stroke of the first piston 22 and the second piston 32 is shortened, the length of the first piston rod 21 and the length of the second piston rod 31 can be shortened accordingly. After the length of the first piston rod 21 and the length of the second piston rod 31 are shortened, the strength requirements of the first piston rod 21 and the second piston rod 31 can be reduced, and the manufacturing difficulty of the first piston rod 21 and the second piston rod 31 can be reduced.

[0023] Furthermore, from another perspective, compared to a single-piston liquid hydrogen pump, with the same piston rod strength, the volume of the pump chamber 13 of the aforementioned liquid hydrogen pump can be designed to be larger, and the flow rate of pumped liquid hydrogen can also be greater.

[0024] In some embodiments, the pump chamber 13 may extend along a first direction, with a first end 13a and a second end 13b located at opposite ends of the pump chamber 13. The first piston 22 and the second piston 32 can move closer to or further away from each other along the first direction, allowing them to counter-pressurize the liquid hydrogen in the pump chamber 13. Compared to using a single piston for pressurization, using the first piston 22 and the second piston 32 to counter-pressurize the liquid hydrogen in the pump chamber 13 results in less impact from the liquid hydrogen on the first piston 22 and the second piston 32, thus extending their service life.

[0025] It should be noted that the specific implementation of the above-mentioned first piston assembly 20 and second piston assembly 30, which are configured to allow the first piston 22 and the second piston 32 to move closer to or further away from each other along the extension direction of the pump chamber 13, can be as follows: the first piston rod 21 in the first piston assembly 20 can drive the first piston 22 to move in the pump chamber 13 along the extension direction of the pump chamber 13, and the second piston rod 31 in the second piston assembly 30 can drive the second piston 32 to move in the pump chamber 13 along the extension direction of the pump chamber 13. This allows the first piston 22 and the second piston 32 to move closer to or further away from each other in the pump chamber 13 along their extension direction under the drive of the first piston rod 21, thereby changing the working volume of the liquid hydrogen pump. During the continuous movement of the first piston 22 and the second piston 32, the working volume is compressed or expanded, so that the liquid hydrogen pump can normally draw in and discharge liquid.

[0026] In some embodiments, the liquid hydrogen pump includes a first drive assembly 40 and a second drive assembly 50. The first drive assembly 40 is drivenly connected to a first piston rod 21 and is used to drive the first piston rod 21 and the first piston 22 to move along the extension direction of the pump chamber 13. The second drive assembly 50 is drivenly connected to a second piston rod 31 and is used to drive the second piston rod 31 and the second piston 32 to move along the extension direction of the pump chamber 13.

[0027] In the above embodiment, the movement of the first piston 22 in the pump chamber 13 is driven by the first drive assembly 40, and the movement of the second piston 32 in the pump chamber 13 is driven by the second drive assembly 50. Both pistons have their own independent drive assemblies, which can avoid the occurrence of insufficient power when driven by a single power source.

[0028] In some embodiments, the first drive assembly 40 is configured as a first hydraulic cylinder 41, the piston rod of the first hydraulic cylinder 41 is configured as a first piston rod 21, and the end of the first piston rod 21 away from the first piston 22 is connected to the third piston 411 of the first hydraulic cylinder 41. The second drive assembly 50 is configured as a second hydraulic cylinder 51, the piston rod of the second hydraulic cylinder 51 is configured as a second piston rod 31, and the end of the second piston rod 31 away from the second piston 32 is connected to the fourth piston 511 of the second hydraulic cylinder 51.

[0029] In the above embodiments, the first piston 22 and the second piston 32 can be driven by the first hydraulic cylinder 41 and the second hydraulic cylinder 51 to move closer to or further away from each other in the extending direction of the pump chamber 13.

[0030] In some specific embodiments, the first hydraulic cylinder 41 is provided with a first oil port 41a communicating with the rodless chamber of the first hydraulic cylinder 41 and a second oil port 41b communicating with the rod chamber of the first hydraulic cylinder 41. The second hydraulic cylinder 51 is provided with a third oil port 51a communicating with the rodless chamber of the second hydraulic cylinder 51 and a fourth oil port 51b communicating with the rod chamber of the second hydraulic cylinder 51. Oil can be supplied to the first hydraulic cylinder 41 and the second hydraulic cylinder 51 through the hydraulic station 60. The hydraulic station 60 may include an oil tank 61, a hydraulic pump 62, a three-position four-way directional valve 63, a main oil inlet circuit, and a main oil return circuit 65.

[0031] like Figure 2 As shown, the oil inlet P of the three-position four-way directional valve 63 is connected to the oil tank 61 through the main oil inlet circuit 64, and the oil return port T of the three-position four-way directional valve 63 is connected to the oil tank 61 through the main oil return circuit 65. The first oil port 41a of the first hydraulic cylinder 41 is connected to the first working oil port A of the three-position four-way directional valve 63 through the first oil circuit 500, and the second oil port 41b of the first hydraulic cylinder 41 is connected to the second working oil port B of the three-position four-way directional valve 63 through the third oil circuit 700. The third oil port 51a of the second hydraulic cylinder 51 is connected to the first working oil port A of the three-position four-way directional valve 63 through the second oil circuit 600, and the fourth oil circuit 800 of the second hydraulic cylinder 51 is connected to the second working oil port B of the three-position four-way directional valve 63 through the fourth oil circuit 800. A hydraulic pump 62 is installed on the main oil inlet circuit 64. The hydraulic pump 62 supplies oil to the first hydraulic cylinder 41 and the second hydraulic cylinder 51. The flow direction of the oil in the first hydraulic cylinder 41 and the second hydraulic cylinder 51 is changed by a three-position four-way directional valve 63, so that the first hydraulic cylinder 41 and the second hydraulic cylinder 51 drive the first piston 22 and the second piston 32 to move closer to each other or further away from each other.

[0032] In some embodiments, the cross-sectional areas of the first piston 22, the second piston 32, the third piston 411, and the fourth piston 511 can be designed so that the operating pressure generated by the liquid hydrogen pump is greater than the driving pressure, that is, the liquid hydrogen pump can generate a large operating pressure with a small driving pressure. For example, when the first piston 22 and the third piston 411 are connected by the first piston rod 21, the cross-sectional area of ​​the first piston 22 can be larger than the cross-sectional area of ​​the third piston 411. Specifically, the ratio of the cross-sectional area of ​​the first piston 22 to the cross-sectional area of ​​the third piston 411 can be 1:3.5, according to the pressure formula... Where P is the pressure, F is the force exerted on the first piston 22 or the third piston 411, and S is the cross-sectional area of ​​the first piston 22 or the third piston 411. Since the first piston 22 and the third piston 411 are connected by the first piston rod 21, the forces acting on them are the same. Therefore, based on the ratio of the cross-sectional areas of the first piston 22 and the third piston 411, the pressure generated by the first piston 22 is 3.5 times that generated by the third piston 411. Furthermore, the ratio of the cross-sectional area of ​​the second piston 32 to the cross-sectional area of ​​the fourth piston 511 can be 1:3.5, according to the pressure formula... Where P is the pressure, F is the pressure exerted on the second piston 32 or the fourth piston 511, and S is the cross-sectional area of ​​the second piston 32 or the fourth piston 511. Since the second piston 32 and the fourth piston 511 are connected by the second piston rod 31, the forces exerted on them are the same. Therefore, based on the ratio of the cross-sectional areas of the second piston 32 and the fourth piston 511, the pressure generated by the second piston 32 is 3.5 times that generated by the fourth piston 511. When the ratio of the cross-sectional areas of the first piston 22 and the third piston 411 is 1:3.5, and the ratio of the cross-sectional areas of the second piston 32 and the fourth piston 511 is also 1:3.5, the working pressure in the pump chamber 13 can reach 90 MPa when the driving pressure of the drive assembly is 25 MPa.

[0033] In some other possible implementations, such as Figure 3 The first drive assembly 40 includes a first electric cylinder 42, a first guide tube, and a first drive piston 72 movably disposed in the first guide tube. The first guide tube extends in the same direction as the pump chamber 13, and also extends along a first direction. The end of the first piston rod 21 furthest from the first piston 22 extends from the first end 13a of the pump chamber 13 and is connected to the first drive piston 72. The first drive rod 421 of the first electric cylinder 42 is also connected to the first drive piston 72. The first electric cylinder 42 drives the first drive piston 72 to move along the first direction in the first guide tube, thereby driving the first piston 22 to move along the first direction in the pump chamber 13.

[0034] Furthermore, the second drive assembly 50 includes a second electric cylinder 52, a second guide tube, and a second drive piston 82 movably disposed within the second guide tube. The second guide tube extends in the same direction as the pump chamber 13, and also extends along a first direction. The end of the second piston rod 31 furthest from the second piston 32 extends from the second end 13b of the pump chamber 13 and connects to the second drive piston 82. The second drive rod 521 of the second electric cylinder 52 is also connected to the second drive piston 82. The second electric cylinder 52 drives the second drive piston 82 to move within the second guide tube along the first direction.

[0035] In the above embodiment, the first electric cylinder 42 and the second electric cylinder 52 can drive the first piston 22 and the second piston 32 to move closer or further apart in the pump chamber 13 to change the working volume in the pump chamber 13. The first piston 22 and the second piston 32 move closer or further apart in the first direction in the pump chamber 13 so that the liquid hydrogen pump can continuously draw in and discharge liquid.

[0036] In some embodiments, the annular body 11 is provided with a first liquid inlet 1121 communicating with the pump chamber 13, and the first liquid inlet 1121 is provided with a first check valve 90 for allowing liquid hydrogen to flow into the pump chamber 13; the annular body 11 is provided with a first liquid outlet 1122 communicating with the pump chamber 13, and the first liquid outlet 1122 is provided with a second check valve 100 for allowing liquid hydrogen to flow out of the pump chamber 13.

[0037] With the above configuration, when the working volume of the liquid hydrogen pump expands, liquid hydrogen can enter the space between the first piston 22 and the second piston 32 in the pump chamber 13 through the first check valve 90 in the first inlet 1121; when the working volume of the liquid hydrogen pump is compressed, the liquid hydrogen between the first piston 22 and the second piston 32 in the pump chamber 13 can be discharged from the pump chamber 13 through the second check valve 100 in the first outlet 1122, so as to meet the liquid hydrogen pump's liquid suction and discharge requirements.

[0038] In some specific embodiments, the annular body 11 includes an outer cylinder 111 and an inner cylinder 112 disposed within the outer cylinder 111. A pump chamber 13 is formed in the inner cylinder 112. A pump pool 12 for containing liquid hydrogen is provided between the inner cylinder 112 and the outer cylinder 111. The pump pool 12 is provided to cool the inner cylinder 112 and reduce the vaporization of liquid hydrogen in the pump chamber 13. In addition, the outer cylinder 111 is provided with a second inlet 1113 and a second outlet 1114 communicating with the pump pool 12. A first flow regulating valve 300 is provided on the second inlet 1113 to regulate the flow rate of liquid hydrogen entering the pump pool 12 through the second inlet 1113. A second flow regulating valve 400 is provided on the second outlet 1114 to regulate the flow rate of liquid hydrogen exiting the pump pool 12 through the second outlet 1114. It should be understood that when the first flow regulating valve 300 and the second flow regulating valve 400 are in the closed state, the second inlet 1113 and the second outlet 1114 are also in the closed state.

[0039] In the above embodiment, the first inlet 1121 is located in the inner cylinder 112 and serves to connect the pump pool 12 and the pump chamber 13, allowing liquid hydrogen in the pump pool 12 to enter the pump chamber 13 through the first inlet 1121. As described above, the pump pool 12 can be used for cooling the inner cylinder 112 and can also temporarily store liquid hydrogen for supplying liquid hydrogen to the pump chamber 13. Furthermore, the first outlet 1122 of the liquid hydrogen pump is located in the inner cylinder 112 and extends from the end away from the pump chamber 13 to the outer cylinder 111 for easy connection to subsequent equipment or systems.

[0040] In some specific embodiments, the second inlet 1113 can be connected to the outlet of the liquid hydrogen storage tank, and the second outlet 1114 can be connected to the inlet of the liquid hydrogen storage tank. Liquid hydrogen is introduced into the pump pool 12 through the second inlet 1113. At this time, the second flow regulating valve 400 on the second outlet 1114 can be in the closed state. When the liquid hydrogen in the pump pool 12 is filled to a preset amount, the first piston 22 and the second piston 32 can be driven to move in the pump chamber 13 by the first drive assembly 40 and the second drive assembly 50. When the first piston 22... 2. When the first piston 22 and the second piston 32 move away from each other, the working volume in the pump chamber 13 expands. Liquid hydrogen in the pump pool 12 enters the pump chamber 13 through the first inlet 1121. Then, the first piston 22 and the second piston 32 move closer to each other along the extension direction of the pump chamber 13 to compress the liquid hydrogen in the pump chamber 13, causing the liquid hydrogen in the pump chamber 13 to be discharged through the first outlet 1122. The first outlet 1122 can be connected to subsequent systems or equipment to discharge the liquid hydrogen in the pump chamber 13 into the subsequent systems or equipment, completing one cycle of liquid hydrogen intake and discharge. When the liquid hydrogen pump is not in use, the liquid hydrogen in the pump pool 12 can be discharged into the liquid hydrogen storage tank through the second outlet 1114 to avoid wasting liquid hydrogen.

[0041] As mentioned above, the pump chamber 13 extends along the first direction, and the inner cylinder also extends along the first direction. To prevent deformation of the inner cylinder, a support 200 can be installed in the pump pool 12, such as... Figure 4 As shown, the brackets 200 are connected to the outer cylinder 111 and the inner cylinder 112 respectively to support the inner cylinder 112. Multiple brackets 200 can be provided along the extension direction of the inner cylinder to better support the inner cylinder 112.

[0042] It should be understood that the support 200 located in the pump pool 12 serves two purposes: firstly, it supports the inner cylinder 112, and secondly, it allows liquid hydrogen in the pump pool 12 to flow through the support 200. The support 200 can be constructed in any suitable form according to actual needs. For example, as Figure 4 As shown, the bracket 200 includes a clamping part 201 and a supporting part 202. The clamping part 201 is a circular ring structure and is fixedly sleeved on the inner cylinder 112. Multiple supporting parts 202 are arranged circumferentially around the clamping part 201. The end of the supporting part 202 away from the clamping part 201 is fixedly connected to the outer cylinder 111 to support the inner cylinder 112, while not hindering the flow of liquid hydrogen in the pump pool 12.

[0043] In some implementations, such as Figures 1 to 3 As shown, the outer wall of the outer cylinder 111 of the liquid hydrogen pump has two interlayers formed between its outer and inner walls for heat insulation of the pump pool 12. The interlayer closer to the inner wall of the outer cylinder 111 is a vacuum interlayer 1111, and the interlayer further away from the inner wall of the outer cylinder 111 is a liquid nitrogen interlayer 1112, which can insulate the pump pool 12. The liquid nitrogen interlayer 1112 may also be provided with an inlet (not shown) and an outlet (not shown). By continuously filling the liquid nitrogen interlayer 1112 with liquid nitrogen and discharging liquid nitrogen from the liquid nitrogen interlayer 1112, the heat insulation performance of the liquid nitrogen is maintained.

[0044] In addition, the vacuum interlayer 1111 provided between the liquid nitrogen interlayer 1112 and the inner wall of the pump pool 12 can prevent the liquid nitrogen from freezing and improve the heat insulation effect of the pump pool 12.

[0045] The process of using this liquid hydrogen pump for liquid hydrogen transportation is briefly described exemplarily in the present disclosure. The length of the pump chamber 13 of this liquid hydrogen pump can be 1 - 3 m, preferably 2 m, and the diameter of the pump chamber 13 is 30 - 90 mm, preferably 60 mm. The first driving component 40 of this liquid hydrogen pump can be configured as a first hydraulic cylinder 41, and the second driving component 50 can be configured as a second hydraulic cylinder 51. First, liquid nitrogen pre-cooling: Add liquid nitrogen into the pump pool 12 to cool and pre-cool the liquid hydrogen pump, and start the first driving component 40 and the second driving component 50 to replace all the air in the pump chamber 13 with nitrogen or liquid nitrogen; then, cold hydrogen replacement: Connect the pump pool 12 to the gas phase of the liquid hydrogen storage tank, introduce hydrogen (room temperature ≥ hydrogen temperature ≥ -180 °C) to replace the nitrogen in the pipeline, the liquid hydrogen storage tank, and the liquid hydrogen pump; until the nitrogen and impurity contents in the pipeline, the liquid hydrogen storage tank, and the liquid hydrogen pump meet the standard requirements, the hydrogen replacement is completed; then, liquid hydrogen pre-cooling and filling: After the hydrogen replacement is completed, fill the liquid hydrogen storage tank with liquid hydrogen. When filling through the liquid hydrogen pump, closely monitor the pressure and liquid level of the liquid hydrogen storage tank. When the liquid hydrogen storage tank is full and the liquid level reaches the set value, stop filling in time and close the relevant valves and the liquid hydrogen pump; then. Cold state leak detection of the liquid hydrogen storage tank and the pump pool 12 of the liquid hydrogen pump: During the cooling process of the liquid hydrogen storage tank and the liquid hydrogen pump, monitor the system leakage of the liquid hydrogen storage tank and the liquid hydrogen pump through a hydrogen detector, a flame detector, and a portable hydrogen detector carried by personnel. The leak detection is qualified when no leakage is detected and there is no pressure drop; then, liquid hydrogen boosting and transfer: Connect the first liquid outlet 1122 of the liquid hydrogen pump to the liquid hydrogen storage equipment, set the operating speed of the compression piston according to the system matching amount, start the system boosting. When the piston frequency reaches 30 times / min, the liquid hydrogen flow rate of the system boosting and transfer can reach 500 kg per hour. Adjust the pressure of the boosting system. According to the ratio of the driving pressure of the first hydraulic cylinder 41 to the working pressure of the pump chamber 13 and the ratio of the driving pressure of the second hydraulic cylinder 51 to the working pressure of the pump chamber 13 are both 1:3.5 (referring to the ratio of the cross-sectional areas of the first piston 22 and the third piston 411 mentioned above is 1:3.5, and the ratio of the cross-sectional areas of the second piston 32 and the fourth piston 511 is 1:3.5, which can make the ratio of the driving pressure of the first hydraulic cylinder 41 to the working pressure of the pump chamber 13 and the ratio of the driving pressure of the second hydraulic cylinder 51 to the working pressure of the pump chamber 13 both 1:3.5), when the driving pressure is 25 MPa, the system pressure can reach a liquid hydrogen boosting pressure of 90 MPa.

[0046] During the transfer process via the liquid hydrogen pump, the liquid hydrogen in the liquid hydrogen storage tank first enters the pump pool 12 through the second inlet 1113 connected to the pump pool 12. Then, driven by the first hydraulic pump 62 and the second hydraulic pump 62, the first piston 22 and the second piston 32 move away from each other along the extension direction of the pump chamber 13, and the working volume in the pump chamber 13 expands so that the liquid hydrogen in the pump pool 12 is adsorbed into the pump chamber 13 through the first inlet 1121. Then, the first piston 22 and the second piston 32 move closer to each other so that the liquid hydrogen in the pump chamber 13 is discharged through the first outlet 1122 into the liquid hydrogen storage device connected to the first outlet 1122. The first piston 22 and the second piston 32 in the liquid hydrogen pump reciprocate in the pump chamber 13 so that the liquid hydrogen pump can continuously draw in and discharge liquid.

[0047] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0048] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0049] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A liquid hydrogen pump, characterized in that, include: A pump cylinder includes an annular body and a pump chamber disposed within the annular body, the pump chamber having a first end and a second end in its extending direction; The first piston assembly includes a first piston rod movably passing through the pump chamber from the first end and a first piston connected to the first piston rod and disposed in the pump chamber; as well as The second piston assembly includes a second piston rod movably passing through the pump chamber from the second end and a second piston connected to the second piston rod and disposed in the pump chamber; The first piston assembly and the second piston assembly are configured to allow the first piston and the second piston to move closer to or further away from each other along the extension direction of the pump chamber, thereby changing the working volume of the pump chamber.

2. The liquid hydrogen pump according to claim 1, characterized in that, The pump chamber extends along a first direction, and the first end and the second end are located at opposite ends of the pump chamber in the first direction. The first piston and the second piston are capable of moving closer to or further away from each other along the first direction.

3. The liquid hydrogen pump according to claim 1 or 2, characterized in that, The liquid hydrogen pump includes a first drive assembly and a second drive assembly. The first drive assembly is drivenly connected to the first piston rod and is used to drive the first piston rod and the first piston to move along the extension direction of the pump chamber. The second drive assembly is drivenly connected to the second piston rod and is used to drive the second piston rod and the second piston to move along the extension direction of the pump chamber.

4. The liquid hydrogen pump according to claim 3, characterized in that, The first drive assembly is configured as a first hydraulic cylinder, the piston rod of the first hydraulic cylinder is configured as a first piston rod, and the end of the first piston rod away from the first piston is connected to a third piston of the first hydraulic cylinder; and / or The second drive assembly is configured as a second hydraulic cylinder, the piston rod of the second hydraulic cylinder is configured as a second piston rod, and the end of the second piston rod away from the second piston is connected to the fourth piston of the second hydraulic cylinder.

5. The liquid hydrogen pump according to claim 4, characterized in that, The ratio of the cross-sectional areas of the first piston and the third piston is 1:3.5; and / or The ratio of the cross-sectional area of ​​the second piston to that of the third piston is 1:3.

5.

6. The liquid hydrogen pump according to claim 3, characterized in that, The first drive assembly is configured as a first electric cylinder; and / or The second drive component is configured as a second electric cylinder.

7. The liquid hydrogen pump according to claim 1, characterized in that, The annular body is provided with a first liquid inlet communicating with the pump chamber, and the first liquid inlet is provided with a first one-way valve for allowing liquid hydrogen to flow into the pump chamber; and The annular body is provided with a first liquid outlet communicating with the pump chamber, and the first liquid outlet is provided with a second one-way valve for allowing liquid hydrogen to flow out of the pump chamber.

8. The liquid hydrogen pump according to claim 7, characterized in that, The annular body includes an outer cylinder and an inner cylinder disposed within the outer cylinder. The pump chamber is formed in the inner cylinder. A pump pool for containing liquid hydrogen is provided between the inner cylinder and the outer cylinder. The outer cylinder is provided with a second inlet and a second outlet communicating with the pump pool. A first flow regulating valve is provided on the second inlet, and a second flow regulating valve is provided on the second outlet. The first inlet is located in the inner cylinder and is used to communicate with the pump pool and the pump chamber. The first outlet is located in the inner cylinder and extends out of the outer cylinder at one end away from the pump chamber.

9. The liquid hydrogen pump according to claim 8, characterized in that, The pump pool is equipped with a support frame, which is connected to the outer cylinder and the inner cylinder respectively to support the inner cylinder.

10. The liquid hydrogen pump according to claim 8, characterized in that, Two interlayers are formed between the outer wall and the inner wall of the outer cylinder for heat insulation of the pump pool; The layer closest to the inner wall of the outer cylinder is a vacuum interlayer, while the layer furthest from the inner wall of the outer cylinder is a liquid nitrogen interlayer.

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