Liquid fluid pressurization method, supply system and vehicle

Abstract

The present invention relates to the field of vehicle engineering technology, and provides a liquid fluid pressurization method, supply system, and vehicle. It is possible to select an appropriate working mode based on the target parameters under the current working conditions, namely, a first mode in which the liquid fluid is pressurized by only the first-stage supercharging assembly, and a second mode in which the liquid fluid is pressurized by the first-stage supercharging assembly and the second-stage supercharging assembly in sequence. Furthermore, when the first-stage supercharging assembly is operating, the opening of its input end and the speed of its drive motor can be adjusted according to the initial pressure value of the liquid fluid. When the second-stage supercharging assembly is operating, the opening of its input end and the speed of the drive motor of the first-stage supercharging assembly can be adjusted according to the pressure value of the liquid fluid after being pressurized by the first-stage supercharging assembly. This can reduce or eliminate the tendency of the pump to evacuate due to negative pressure conveying of liquid and vapor, and is also beneficial to improving the energy utilization rate of the low-temperature fuel high-pressure supply system.

Description

Technical Field

[0001] The present invention relates to the field of vehicle engineering technology, and in particular to a liquid fluid pressurization method, a supply system and a vehicle. Background Art

[0002] Liquefied natural gas (LNG) is typically stored in cryogenic tanks at temperatures of approximately -150°C to -115°C and pressures of 5 to 20 bar. To ensure that natural gas is injected directly into the cylinder at high pressure at the end of the compression stroke of the internal combustion engine piston, a cryogenic LNG booster pump and a high-pressure supply system are typically required.

[0003] Existing cryogenic booster pumps require a positive delivery pressure to prevent or reduce the tendency of the pump to evacuate. One approach places the cryogenic pump directly within the liquid to provide the desired positive pressure. However, when boosting the liquid LNG, this pump simultaneously leaks a significant amount of heat into the LNG cryogenic storage tank, which is undesirable. Another approach places the cryogenic pump outside the cryogenic storage tank. However, the rapid pumping action of the cryogenic pump can create a negative pressure to deliver liquid and vapor, potentially leading to a pump evacuation.

[0004] Therefore, there is an urgent need for a liquid fluid pressurization method, supply system and vehicle to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a liquid fluid pressurization method, supply system and vehicle, which can reduce or eliminate the pump evacuation tendency caused by negative pressure delivery of liquid and vapor, and is also beneficial to improving the energy utilization of the low-temperature fuel high-pressure supply system.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A liquid fluid pressurization method is applicable to a supply system, wherein the supply system includes a first-stage pressurization assembly, a second-stage pressurization assembly, and a main container. The liquid fluid pressurization method includes:

[0008] Get target pressure P obj If P obj ≤P c1 , the first mode is executed, the liquid fluid is pressurized by the first-stage booster assembly and then flows into the main container, and the second-stage booster assembly is idle; if P obj >P c1 The second mode is then executed, and the liquid fluid is pressurized by the first-stage supercharging assembly and the second-stage supercharging assembly in sequence and then enters the main container; P c1 is the mode switching threshold;

[0009] When the first-stage supercharging assembly is working, the actual pressure value P1 of the first-stage supercharging assembly is obtained. If P1≤Pobj And P0>P c2 , then increase the opening of the input end of the above-mentioned first-stage supercharging assembly and the speed of its driving motor; P0 is the pressure value of the input end of the above-mentioned first-stage supercharging assembly, P c2 is the pressure control threshold; if P1≤P obj And P0≤P c2 , then reduce the opening of the input end of the above-mentioned first-stage supercharging assembly and the speed of its driving motor;

[0010] When the above-mentioned two-stage supercharging assembly is working, the actual pressure value P2 of the above-mentioned two-stage supercharging assembly is obtained. If P1≥P2, the opening of the input end of the above-mentioned two-stage supercharging assembly is increased. If P1<P2, the opening of the input end of the above-mentioned two-stage supercharging assembly is reduced and the speed of the above-mentioned drive motor is increased.

[0011] A supply system is also provided, which is suitable for the above-mentioned liquid fluid pressurization method, wherein the above-mentioned first-stage boosting assembly includes a first-stage driving member and a first-stage piston assembly, the above-mentioned first-stage piston assembly includes a first piston and a first cylinder sleeve, the above-mentioned first-stage driving member drives the above-mentioned first piston to reciprocate along the axis in the above-mentioned first cylinder sleeve, and the above-mentioned first-stage driving member is the above-mentioned driving motor; the above-mentioned second-stage boosting assembly includes a second-stage driving member and a second-stage piston assembly, the above-mentioned second-stage piston assembly includes a second piston and a second cylinder sleeve, and the above-mentioned second-stage driving member drives the above-mentioned second piston to reciprocate along the axial direction in the above-mentioned second cylinder sleeve; the output end of the above-mentioned first cylinder sleeve can be selectively connected to the input end of the above-mentioned main container, or connected to the input end of the above-mentioned second cylinder sleeve, and the output end of the above-mentioned second cylinder sleeve is connected to the input end of the above-mentioned main container.

[0012] As a preferred technical solution of the above-mentioned supply system, the above-mentioned first-stage piston assembly also includes an elastic member, and the above-mentioned elastic member is installed in the above-mentioned first cylinder sleeve, so that the above-mentioned first piston always has a tendency to move toward its bottom dead center.

[0013] As a preferred technical solution of the above-mentioned supply system, the above-mentioned first-stage supercharging assembly also includes a first regulating valve, which is installed at the input end of the above-mentioned first cylinder liner and is used to change the opening of the input end of the above-mentioned first cylinder liner.

[0014] As a preferred technical solution of the above-mentioned supply system, the above-mentioned first-stage boosting assembly also includes a first-stage material storage component, and the above-mentioned first-stage material storage component includes a first-stage container. The output end of the above-mentioned first cylinder liner is unidirectionally connected to the input end of the above-mentioned first-stage container, and the output end of the above-mentioned first-stage container can be selectively unidirectionally connected to the input end of the above-mentioned main container, or unidirectionally connected to the input end of the above-mentioned second cylinder liner.

[0015] As a preferred technical solution of the above-mentioned supply system, the above-mentioned two-stage boosting assembly also includes a second regulating valve, and the output end of the above-mentioned first-level container can be unidirectionally connected to the input end of the above-mentioned second cylinder liner through the above-mentioned second regulating valve, and the above-mentioned second regulating valve is used to change the opening of the input end of the above-mentioned second cylinder liner.

[0016] As a preferred technical solution of the above-mentioned supply system, the above-mentioned two-stage boosting assembly also includes a two-stage material storage component, and the above-mentioned two-stage material storage component includes a two-stage container. The output end of the above-mentioned second cylinder sleeve is unidirectionally connected to the input end of the above-mentioned two-stage container, and the output end of the above-mentioned two-stage container can flow unidirectionally with the input end of the above-mentioned main container. The above-mentioned first-stage container is connected to the above-mentioned main container through the above-mentioned second-stage container.

[0017] As a preferred technical solution of the above-mentioned supply system, the above-mentioned secondary material storage component also includes a third regulating valve, the input end of the above-mentioned third regulating valve is connected to the output end of the above-mentioned secondary container, and the output end of the above-mentioned third regulating valve is connected to the input end of the above-mentioned main container, and the above-mentioned third regulating valve is capable of adjusting the flow rate of the above-mentioned liquid fluid entering the above-mentioned main container.

[0018] As a preferred technical solution of the above-mentioned supply system, it also includes an evaporator, and the above-mentioned evaporator is connected between the output end of the above-mentioned secondary container and the input end of the above-mentioned main container.

[0019] A vehicle is also provided, comprising an engine and the above-mentioned supply system, wherein in the above-mentioned second mode, the rotational speed of the above-mentioned secondary driving component is positively correlated with the rotational speed of the above-mentioned engine.

[0020] Beneficial effects of the present invention:

[0021] A liquid fluid pressurization method is provided, which is applicable to a supply system. The supply system includes a first-stage pressurization assembly, a second-stage pressurization assembly, and a main container. The liquid fluid pressurization method includes:

[0022] Get target pressure P obj If P obj ≤P c1 , the first mode is executed, the liquid fluid is pressurized by the first-stage booster assembly and then flows into the main container, and the second-stage booster assembly is idle; if P obj >P c1 The second mode is then executed, and the liquid fluid enters the main container after being pressurized by the first-stage supercharging assembly and the second-stage supercharging assembly in sequence; P c1 is the mode switching threshold;

[0023] When the first-stage supercharger assembly is working, obtain the actual pressure value P1 of the first-stage supercharger assembly. If P1≤P obj And P0>P c2, then increase the opening of the input end of the first-stage supercharging assembly and the speed of its driving motor; P0 is the pressure value of the input end of the first-stage supercharging assembly, P c2 is the pressure control threshold; if P1≤P obj And P0≤P c2 , then reduce the opening of the input end of the first-stage supercharging assembly and the speed of its driving motor;

[0024] When the two-stage supercharging assembly is working, the actual pressure value P2 of the two-stage supercharging assembly is obtained. If P1 ≥ P2, the opening of the input end of the two-stage supercharging assembly is increased. If P1 < P2, the opening of the input end of the two-stage supercharging assembly is reduced and the speed of the drive motor is increased.

[0025] In this way, first obtain the target pressure value P under the current working conditions obj By comparing P obj and mode switching threshold P c1 The size of P is used to determine which working mode is the optimal solution under the current working conditions. obj ≤P c1 , the first mode is executed, the liquid fluid is pressurized by the first-stage booster assembly and then flows into the main container, and the second-stage booster assembly is idle; if P obj >P c1 The second mode is then executed, and the liquid fluid is pressurized by the first and second booster assemblies in sequence before entering the main container; in this way, the second booster assembly is selectively activated to avoid energy loss. When the first booster assembly is operating, it can adjust the initial pressure value P1 of the liquid fluid at its input end according to the pressure control threshold P1. c2 and the speed of the first-stage driving member according to the size relationship of the liquid fluid pressure values ​​P2 and P1 at its input end; when the second-stage boost assembly is operating, it can adjust the opening of its input end and the speed of the first-stage driving member according to the size relationship of the liquid fluid pressure values ​​P2 and P1 at its input end; it can reduce or eliminate the pump evacuation tendency caused by negative pressure delivery of liquid and vapor, and is also beneficial to improving the energy utilization rate of the low-temperature fuel high-pressure supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without any creative work.

[0027] Figure 1 Schematic diagram of the structure of the first-stage supercharging assembly and the second-stage supercharging assembly provided by an embodiment of the present invention;

[0028] Figure 2This is a structural diagram of a first-stage boosting assembly and a main container provided by an embodiment of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the two-stage boosting assembly and the main container provided in an embodiment of the present invention.

[0030] In the picture:

[0031] 100, first-stage booster assembly; 110, first-stage drive element; 120, first-stage piston assembly; 121, first piston; 122, first cylinder liner; 1221, first compression chamber; 123, elastic element; 124, first regulating valve; 125, first one-way valve; 126, second one-way valve; 127, first pressure sensor; 130, first-stage material storage assembly; 131, first-stage container; 132, second pressure sensor; 133, third one-way valve;

[0032] 200, secondary boost assembly; 210, secondary drive element; 220, secondary piston assembly; 221, second piston; 222, second cylinder liner; 2221, second compression chamber; 223, second regulating valve; 224, fourth one-way valve; 225, fifth one-way valve; 230, secondary storage assembly; 231, secondary container; 232, third regulating valve; 233, third pressure sensor; 234, first temperature sensor;

[0033] 300, main container; 310, fourth pressure sensor; 320, second temperature sensor;

[0034] 400, evaporator;

[0035] 500. Control unit. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0037] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0038] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0040] The present invention provides a liquid fluid pressurization method applicable to a supply system, wherein the supply system includes a first-stage pressurization assembly 100, a second-stage pressurization assembly 200, and a main container 300. The liquid fluid pressurization method includes:

[0041] Get target pressure P obj If P obj ≤P c1 , the first mode is executed, the liquid fluid is pressurized by the first-stage booster assembly 100 and then flows into the main container 300, and the second-stage booster assembly 200 is idle; if P obj >P c1 The second mode is executed, and the liquid fluid is pressurized by the first-stage pressurizing assembly 100 and the second-stage pressurizing assembly 200 in sequence and then enters the main container 300; c1 is the mode switching threshold;

[0042] When the first-stage supercharging assembly 100 is working, the actual pressure value P1 of the first-stage supercharging assembly 100 is obtained. If P1≤P obj And P0>P c2 , then increase the opening of the input end of the first-stage supercharging assembly 100 and the speed of its driving motor; P0 is the pressure value of the input end of the first-stage supercharging assembly 100, P c2 is the pressure control threshold; if P1≤P obj And P0≤P c2 , then reduce the opening of the input end of the first-stage supercharging assembly 100 and the speed of its driving motor;

[0043] When the two-stage supercharging assembly 200 is working, the actual pressure value P2 of the two-stage supercharging assembly 200 is obtained. If P1≥P2, the opening of the input end of the two-stage supercharging assembly 200 is increased. If P1<P2, the opening of the input end of the two-stage supercharging assembly 200 is reduced and the speed of the drive motor is increased.

[0044] In this way, first obtain the target pressure value P under the current working conditions obj By comparing P obj and mode switching threshold P c1 The size of P is used to determine which working mode is the optimal solution under the current working conditions. obj ≤P c1 , the first mode is executed, the liquid fluid is pressurized by the first-stage booster assembly 100 and then flows into the main container 300, and the second-stage booster assembly 200 is idle; if P obj >P c1 The second mode is then executed, and the liquid fluid is pressurized by the first-stage booster assembly 100 and the second-stage booster assembly 200 in sequence before entering the main container 300; in this way, the second-stage booster assembly 200 is selectively activated to avoid energy loss. When the first-stage booster assembly 100 is operating, it can adjust the pressure according to the initial pressure value P1 of the liquid fluid at its input end and the pressure control threshold P c2 When the two-stage boost assembly 200 is in operation, it can adjust the opening of its input end and the speed of the driving motor according to the size relationship between the liquid fluid pressure values ​​P2 and P1 at its input end; it can reduce or eliminate the pump evacuation trend caused by negative pressure conveying of liquid and steam, and is also beneficial to improving the energy utilization rate of the supply system.

[0045] In this embodiment, the liquid fluid may be any liquid fuel such as natural gas, hydrogen, or nitrogen.

[0046] Furthermore, the liquid fluid is cryogenic fuel.

[0047] like Figures 1 to 3As shown, a supply system is also provided, which is suitable for the above-mentioned liquid fluid pressurization method, wherein the first-stage boosting assembly 100 includes a first-stage driving member 110 and a first-stage piston assembly 120, the first-stage piston assembly 120 includes a first piston 121 and a first cylinder sleeve 122, the first-stage driving member 110 drives the first piston 121 to reciprocate along the axis in the first cylinder sleeve 122, and the first-stage driving member 110 is a driving motor; the second-stage boosting assembly 200 includes a second-stage driving member 210 and a second-stage piston assembly 220, the second-stage piston assembly 220 includes a second piston 221 and a second cylinder sleeve 222, the second-stage driving member 210 drives the second piston 221 to reciprocate along the axial direction in the second cylinder sleeve 222; the output end of the first cylinder sleeve 122 can be selectively connected to the input end of the main container 300, or connected to the input end of the second cylinder sleeve 222, and the output end of the second cylinder sleeve 222 is connected to the input end of the main container 300.

[0048] For example, a cylindrical cavity is formed in the first cylinder sleeve 122, and the first piston 121 is partially inserted into the first cylinder sleeve 122 from one axial end of the cylindrical cavity. The first piston 121 and a part of the inner peripheral wall of the first cylinder sleeve 122 form a first compression chamber 1221. The input end and the output end of the first cylinder sleeve 122 are both formed in the first compression chamber 1221. When the primary driving member 110 drives the first piston 121, the first piston 121 can move relative to the first cylinder sleeve 122 in the axial direction, which can change the first compression chamber 1221. The volume of the first compression chamber 1221 is reduced, and its internal pressure increases when the first piston 121 moves toward its top dead center, squeezing and performing work on the liquid fluid therein, thereby achieving a preliminary pressurization effect, and the liquid fluid can be discharged from the output end of the first cylinder liner 122. When the first piston 121 moves toward its bottom dead center, the volume of the first compression chamber 1221 increases, and its internal pressure decreases, so that the liquid fluid can enter the first compression chamber 1221 from the input end of the first cylinder liner 122.

[0049] For example, a cylindrical cavity is formed in the second cylinder sleeve 222, and the second piston 221 is partially inserted into the second cylinder sleeve 222 from one axial end of the cylindrical cavity. The second piston 221 and a part of the inner peripheral wall of the second cylinder sleeve 222 form a second compression chamber 2221. The input end and the output end of the second cylinder sleeve 222 are both formed in the second compression chamber 2221. When the secondary driving member 210 drives the second piston 221, the second piston 221 can move relative to the second cylinder sleeve 222 in the axial direction, which can change the second compression chamber 2221. The volume of the second compression chamber 2221 is reduced, and its internal pressure increases when the second piston 221 moves toward its top dead center, squeezing and performing work on the liquid fluid therein, thereby achieving a pressurizing effect. The liquid fluid can be discharged from the output end of the second cylinder liner 222. When the second piston 221 moves toward its bottom dead center, the volume of the second compression chamber 2221 increases, and its internal pressure decreases, so that the liquid fluid can enter the second compression chamber 2221 from the input end of the second cylinder liner 222.

[0050] It should be noted that the top dead center of the piston is the position when the piston has the maximum stroke into the cylinder liner, and the bottom dead center of the piston is the position when the piston has the maximum stroke out of the cylinder liner under the premise that the piston remains connected to the cylinder liner.

[0051] Furthermore, if P obj ≤P c1 , the supply system executes the first mode, the output end of the first cylinder sleeve 122 is connected to the input end of the main container 300, the liquid fluid is pressurized by the first-stage booster assembly 100 and then flows into the main container 300, and the second-stage booster assembly 200 is idle; if P obj >P c1 , the supply system executes the second mode, the output end of the first cylinder sleeve 122 is connected to the input end of the second cylinder sleeve 222, and the output end of the second cylinder sleeve 222 is connected to the input end of the main container 300, and the liquid fluid enters the main container 300 after being pressurized by the first-stage supercharging assembly 100 and the second-stage supercharging assembly 200 in sequence.

[0052] Generally, the primary drive member 110 is in transmission connection with the first piston 121. Due to the influence of the assembly process or the processing process, there is always a movable gap between the two. That is, under ideal conditions, the movable gap does not exist. When the output end of the primary drive member 110 moves along the axial direction of the first cylinder sleeve 122 by a moving length H1, the first piston 121 moves along the axial direction of the first cylinder sleeve 122 by a length H2 driven by the output end of the primary drive member 110, satisfying the condition that H1=H2. The existence of this gap results in that, in the return stage, that is, when moving from the top dead center to the bottom dead center, after the output end of the first-stage driving member 110 initiates the return action, it takes a period of time before the first piston 121 responds to the drive of the first-stage driving member 110 and starts the return action. When the first piston 121 moves to H2' from its top dead center, H2'<H2, the output end of the first-stage driving member 110 has completed the return action and re-initiated the process action, that is, moving from the bottom dead center to the top dead center, and encountering the first piston 121 that has not completed the return action on the way, and driving the first piston 121 to perform the process motion. In this way, the first piston 121 is always unable to complete the complete return length, which changes the compression deformation of the first compression chamber 1221 and reduces the compression quality and compression efficiency of the first-stage boosting assembly 100.

[0053] To this end, in this embodiment, the first-stage piston assembly 120 further includes an elastic member 123 . The elastic member 123 is installed in the first cylinder sleeve 122 , so that the first piston 121 always has a tendency to move toward its bottom dead center.

[0054] Exemplarily, the elastic member 123 is installed in the first compression chamber 1221 of the first cylinder sleeve 122, and the elastic deformation direction of the elastic member 123 is parallel to the axial direction of the first compression chamber 1221. One active end of the elastic member 123 abuts the axial end face of the first cylinder sleeve 122, and the other active end abuts the first piston 121. When the first-stage driving member 110 drives the first piston 121 to move toward the upper dead center along the axis, the elastic member 123 is squeezed and deformed by the first piston 121 and the first cylinder sleeve 122, and the elastic member 123 stores energy. When the first-stage driving member 110 drives the first piston 121 to move to the lower dead center, the elastic member 123 is gradually released and the deformation is restored. The elastic member 123 applies a force to the first piston 121 pointing to the side of the first-stage driving member 110, so that the first piston 121 can be close to the first-stage driving member 110, complete the return action and can respond immediately.

[0055] Such a setting can solve the problem that when the pressure P0 of the liquid fluid before entering the first cylinder sleeve 122 is relatively low, the force exerted by the liquid fluid on the first piston 121 is small, resulting in the movement rhythm of the first-stage drive member 110 and the first piston 121 being out of sync during the return stage. The elastic member 123 can exert a force on the first piston 121, so that the first piston 121 is always in contact with the first-stage drive member 110 during the return stage, thereby improving the boosting quality and boosting efficiency of the first-stage boosting assembly 100.

[0056] Optionally, the first-stage supercharging assembly 100 further includes a first regulating valve 124 , which is installed at the input end of the first cylinder liner 122 and is used to change the opening of the input end of the first cylinder liner 122 .

[0057] Illustratively, the output end of the first regulating valve 124 is connected to the input end of the first cylinder liner 122, and the liquid fluid enters the first regulating valve 124 from the input end of the first regulating valve 124 and enters the first cylinder liner 122 through the first regulating valve 124. The first regulating valve 124 can adjust the radial opening size of its internal flow channel, thereby changing the opening of the input end of the first cylinder liner 122.

[0058] In this way, the opening of the input end of the first cylinder sleeve 122 is adjusted by the first regulating valve 124 , which is easy to operate and has a simple structure; when the first regulating valve 124 reduces the opening of its flow channel, it can limit the gaseous fluid from entering the first cylinder sleeve 122 .

[0059] Furthermore, a first one-way valve 125 is connected between the output end of the first regulating valve 124 and the input end of the first cylinder sleeve 122. The first one-way valve 125 allows the liquid fluid to flow from the first regulating valve 124 to the first cylinder sleeve 122 in one direction, thereby preventing the liquid fluid from flowing back from the input end of the first cylinder sleeve 122 to the first regulating valve 124 and its upstream area after being squeezed by the first piston 121.

[0060] Optionally, the first-stage boost assembly 100 also includes a first-stage storage component 130, which includes a first-stage container 131. The output end of the first cylinder liner 122 is unidirectionally connected to the input end of the first-stage container 131, and the output end of the first-stage container 131 can be selectively unidirectionally connected to the input end of the main container 300, or unidirectionally connected to the input end of the second cylinder liner 222.

[0061] Exemplarily, the first-level storage assembly 130 also includes a second one-way valve 126, the input end of the second one-way valve 126 is connected to the output end of the first cylinder sleeve 122, and the output end of the second one-way valve 126 is connected to the input end of the first-level container 131. The second one-way valve 126 allows the liquid fluid to flow from the first cylinder sleeve 122 to the first-level container 131 in one direction, and is used to prevent the liquid fluid in the first-level container 131 from flowing back into the first cylinder sleeve 122 and its upstream area, thereby realizing one-way flow between the first cylinder sleeve 122 and the first-level container 131.

[0062] Exemplarily, the first-level storage component 130 also includes a third one-way valve 133, the input end of the third one-way valve 133 is connected to the output end of the first-level container 131, and the output end of the third one-way valve 133 is connected to the input end of the main container 300. The third one-way valve 133 allows the liquid fluid to flow from the first-level container 131 to the main container 300 in one direction, and is used to prevent the liquid fluid in the main container 300 from flowing back into the first-level container 131 and its upstream area, thereby realizing one-way flow between the first-level container 131 and the main container 300.

[0063] Optionally, the two-stage boost assembly 200 further includes a second regulating valve 223 , and the output end of the first-stage container 131 can be unidirectionally connected to the input end of the second cylinder liner 222 through the second regulating valve 223 , and the second regulating valve 223 is used to change the opening of the input end of the second cylinder liner 222 .

[0064] Illustratively, the input end of the second regulating valve 223 is connected to the output end of the first-stage container 131, and the output end of the second regulating valve 223 is connected to the input end of the second cylinder sleeve 222. The second regulating valve 223 can adjust the opening of the flow channel inside itself to achieve communication or blocking between the first-stage container 131 and the second cylinder sleeve 222, and can control the flow rate of liquid fluid from the first-stage container 131 into the second cylinder sleeve 222 when the first-stage container 131 and the second cylinder sleeve 222 are in a connected state.

[0065] Illustratively, the fourth one-way valve 224 is arranged at the input end and / or output end of the second regulating valve 223. The fourth one-way valve 224 allows the liquid fluid to flow one-way from the primary container 131 to the second cylinder sleeve 222, and is used to prevent the liquid fluid pressurized by the secondary piston assembly 220 from flowing back into the primary container 131 and its upstream area, thereby realizing one-way communication between the primary container 131 and the second cylinder sleeve 222.

[0066] Optionally, the secondary boost assembly 200 further includes a secondary storage assembly 230, which includes a secondary container 231. The output end of the second cylinder sleeve 222 is in one-way communication with the input end of the secondary container 231, and the output end of the secondary container 231 can be in one-way communication with the input end of the main container 300. The primary container 131 is in communication with the main container 300 via the secondary container 231. In this way, the liquid fluid pressurized by the primary boost assembly 100 or the liquid fluid pressurized by both the primary boost assembly 100 and the secondary boost assembly 200 can be stored in the secondary container 231 for ready access and use, ensuring continuous and stable supply when the liquid fluid is output.

[0067] Exemplarily, the secondary storage assembly 230 also includes a fifth one-way valve 225, the input end of the fifth one-way valve 225 is connected to the output end of the second cylinder sleeve 222, and the output end of the fifth one-way valve 225 is connected to the input end of the secondary container 231. The fifth one-way valve 225 allows the liquid fluid to flow from the second cylinder sleeve 222 to the secondary container 231 in one direction, preventing the liquid fluid in the secondary container 231 from flowing back into the second cylinder sleeve 222.

[0068] Illustratively, in this embodiment, the third one-way valve 133 is connected between the primary container 131 and the secondary container 231 to achieve one-way flow of liquid fluid from the primary container 131 to the secondary container 231 .

[0069] Optionally, the secondary material storage component 230 also includes a third regulating valve 232, the input end of the third regulating valve 232 is connected to the output end of the secondary container 231, and the output end of the third regulating valve 232 is connected to the input end of the main container 300. The third regulating valve 232 can adjust the flow rate of the liquid fluid entering the main container 300.

[0070] Optionally, the supply system further includes an evaporator 400, which is connected between the output of the secondary container 231 and the input of the main container 300. Low-temperature, high-pressure liquid fluid passes through the evaporator 400, where heat exchange occurs, absorbing heat and vaporizing the liquid fluid, converting it into a high-pressure gaseous fluid.

[0071] Furthermore, the supply system further comprises a control unit 500, which can obtain P obj , and compare P obj With P c1 The relationship between the size of the supply system and the operation mode can be used to determine whether the supply system should execute the first mode or the second mode under this working condition. obj ≤P c1, the supply system executes the first mode, and the control unit 500 commands the second regulating valve 223 to block the communication between the output end of the first container 131 and the input end of the second cylinder sleeve 222, so that the liquid fluid, after being pressurized by the first-stage booster assembly 100, flows through the first-stage storage assembly 130, the second-stage storage assembly 230 and the main container 300 in sequence; if P obj >P c1 , the supply system executes the second mode, and the control unit 500 commands the second regulating valve 223 to connect the output end of the first-level container 131 and the input end of the second cylinder sleeve 222, so that the liquid fluid can enter the second-level boosting assembly 200 through the second regulating valve 223 after being pressurized by the first-level boosting assembly 100 for re-pressurization, and then flow through the second-level storage component 230 and the main container 300 in sequence.

[0072] It should be noted that the force F required for the liquid fluid to pass through the third one-way valve 133 and enter the secondary container 231 is 1 , satisfying F1>F2, F2 is the force of the liquid fluid entering the second cylinder sleeve 222 through the fourth one-way valve 224. In this way, when the second mode is executed, the liquid fluid in the first-level container 131 is diverted to the second cylinder sleeve 222.

[0073] Furthermore, the first-stage supercharging assembly 100 also includes a first pressure sensor 127 and a second pressure sensor 132, wherein the first pressure sensor 127 is installed at the input end of the first regulating valve 124 and is used to obtain the value of P0, which is the pressure value at the input end of the first-stage supercharging assembly 100, that is, the initial pressure value before the liquid fluid enters the first-stage supercharging assembly 100. The second pressure sensor 132 is installed at the output end of the first cylinder liner 122 and is used to obtain the value of P1, which is the actual pressure value of the first-stage supercharging assembly 100, that is, the pressure value of the liquid fluid after the first-stage supercharging assembly 100 does work. The first pressure sensor 127 and the second pressure sensor 132 are both communicatively connected to the control unit 500, and the control unit 500 can obtain P0 and P1, and can respectively determine the difference between P1 and P1. 0bj The size relationship between P0 and P c2 The size relationship.

[0074] If P1≤P obj And P0>P c2 , it means that the pressure of the liquid fluid entering the first cylinder sleeve 122 meets the use requirements, and the control unit 500 commands the first regulating valve 124 to increase its opening, and commands the first-stage driving component 110 to increase the speed to improve the supercharging efficiency.

[0075] If P1≤P obj And P0≤P c2, it means that the pressure of the liquid fluid entering the first cylinder liner 122 is relatively low, and it is easy to be evacuated. That is, under ideal conditions, all the fluid entering the first cylinder liner 122 is liquid, but when P0≤P c2 When the first cylinder liner 122 is in the working state, some gaseous fluid may be sucked in. Since the compression deformation of the gas is greater than that of the liquid, the boost quality is reduced. The control unit 500 then commands the first regulating valve 124 to reduce its opening and commands the first-stage drive component 110 to reduce its speed to avoid the pressure difference being too large and sucking in a large amount of gas.

[0076] Furthermore, the two-stage boost assembly 200 includes a third pressure sensor 233, which is mounted on the second-stage container 231 and is used to obtain the value of P2, which is the actual pressure value of the two-stage boost assembly 200. The third pressure sensor 233 is in communication with the control unit 500. When executing the second mode, the control unit 500 obtains the value of P2 and can determine the relationship between P2 and P1.

[0077] If P1≥P2 is satisfied, it means that the pressure value of the liquid fluid pressurized by the first-stage supercharging assembly 100 is large, and the control unit 500 commands the second regulating valve 223 to increase its opening. Since the flow rate is positively correlated with the opening and negatively correlated with the pressure, the opening is also negatively correlated with the pressure, thereby improving the supercharging efficiency.

[0078] If P1<P2 is satisfied, it means that the pressure value of the liquid fluid pressurized by the first-stage supercharging assembly 100 is small, and the control unit 500 instructs the second regulating valve 223 to reduce its opening and increase the rotation speed of the first-stage driving member 110.

[0079] Furthermore, a fourth pressure sensor 310 is installed at the output end of the third regulating valve 232. The third pressure sensor 233 is used to obtain the pressure value P2 of the liquid fluid in the secondary container 231, and the fourth pressure sensor 310 is used to obtain the pressure value P3 of the liquid fluid in the main container 300. The third pressure sensor 233 and the fourth pressure sensor 310 are both communicatively connected to the control unit 500. The control unit 500 can respectively obtain P2 and P3, and can also determine ΔP = P3 - P2. Based on ΔP, the opening of the third regulating valve 232 is adjusted to affect the flow rate of the liquid fluid. According to the Bernoulli equation, it can be seen that as the liquid fluid velocity increases, the pressure decreases, and as the liquid fluid velocity decreases, the pressure increases. Therefore, it can be deduced that the flow rate of the liquid fluid is negatively correlated with the pressure.

[0080] Furthermore, a first temperature sensor 234 is installed at the input end of the evaporator 400, and a second temperature sensor 320 is installed at the output end of the evaporator 400. The first temperature sensor 234 is used to obtain the temperature T1 of the liquid fluid after being pressurized, and the second temperature sensor 320 is used to obtain the temperature T2 of the fluid after heat exchange in the evaporator 400. The control unit 500 can obtain T1 and T2 respectively, and obtain ΔT=T2-T1. According to ΔT, the working state of the evaporator 400 is judged. If ΔT<T 阈1 , it means that the heat exchange efficiency of the evaporator 400 is low. The control unit 500 can adjust the working gear of the evaporator 400 to improve its heat exchange efficiency. It can also limit the flow rate of the liquid fluid entering the evaporator 400 by adjusting the third regulating valve 232, so that the liquid fluid can fully exchange heat in the evaporator 400, thereby improving the heat exchange efficiency. If ΔT>T 阈2 , it means that the heat exchange efficiency of the evaporator 400 is too high, resulting in energy waste. The control unit 500 can adjust the working gear of the evaporator 400 to reduce its heat exchange efficiency. The flow rate of the liquid fluid entering the evaporator 400 can be increased by adjusting the third regulating valve 232, thereby reducing the heat exchange time of the liquid fluid in the heat exchanger. It should be noted that T 阈1 With T 阈2 The fluid temperature range value that meets the current working conditions.

[0081] Furthermore, the first-stage piston assembly 120, the second-stage piston assembly 220, the first-stage material storage assembly 130 and the second-stage material storage assembly 230 are integrated and installed in a low-temperature isolation device, which is beneficial to reducing the structural size and manufacturing cost of the insulation measures.

[0082] A vehicle is also provided, comprising an engine and the above-mentioned supply system, wherein in the second mode, the rotation speed of the secondary driving member 210 is positively correlated with the rotation speed of the engine.

[0083] The first mode is suitable for engine starting, idling, low speed and low load operating conditions, and is especially beneficial for the first quick start of the engine.

[0084] The second mode is suitable for most operating conditions of the engine and is more suitable for high power loads, which is beneficial to improving the maximum power torque of the engine.

[0085] Furthermore, the primary drive element 110 is a brushless DC motor, which can quickly and accurately adjust and control the rotation speed to better meet the flexible pressure and flow control requirements of the supply system.

[0086] Furthermore, the secondary driving member 210 uses the engine crankshaft transmission gear to drive the second piston 221, so that the engine provides higher driving power, which better meets the supply requirements of the supply system for higher pressure and larger flow.

[0087] Furthermore, the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A supply system, suitable for a liquid fluid pressurization method, characterized in that: The supply system comprises a primary boosting assembly (100), a secondary boosting assembly (200) and a main container (300), wherein the primary boosting assembly (100) comprises a primary driving member (110) and a primary piston assembly (120), wherein the primary piston assembly (120) comprises a first piston (121) and a first cylinder sleeve (122), wherein the primary driving member (110) drives the first piston (121) to perform reciprocating motion along an axis in the first cylinder sleeve (122), and the primary driving member (110) is a driving motor; the secondary boosting assembly (200) comprises A secondary driving member (210) and a secondary piston assembly (220), wherein the secondary piston assembly (220) comprises a second piston (221) and a second cylinder sleeve (222), wherein the secondary driving member (210) drives the second piston (221) to reciprocate axially in the second cylinder sleeve (222); the output end of the first cylinder sleeve (122) can selectively communicate with the input end of the main container (300), or with the input end of the second cylinder sleeve (222), and the output end of the second cylinder sleeve (222) is communicated with the input end of the main container (300); The first-stage piston assembly (120) further includes an elastic member (123), wherein the elastic member (123) is installed in the first cylinder sleeve (122), so that the first piston (121) always has a tendency to move toward its bottom dead center; The first-stage supercharging assembly (100) further includes a first regulating valve (124), which is installed at the input end of the first cylinder sleeve (122) and is used to change the opening of the input end of the first cylinder sleeve (122); The two-stage supercharging assembly (200) further includes a second regulating valve (223), wherein the second regulating valve (223) is used to change the opening of the input end of the second cylinder sleeve (222); The liquid fluid pressurization method comprises: Get target pressure P obj ; If P obj ≤P c1 , the first mode is executed, the liquid fluid is pressurized by the first-stage booster assembly (100) and then flows into the main container (300), and the second-stage booster assembly (200) is idle; if P is satisfied obj >P c1 The second mode is then executed, and the liquid fluid is pressurized by the first-stage pressurizing assembly (100) and the second-stage pressurizing assembly (200) in sequence and then enters the main container (300); P c1 is the mode switching threshold; When the first-stage supercharging assembly (100) is working, the actual pressure value P1 of the first-stage supercharging assembly (100) is obtained. If P1≤P obj And P0>P c2 , then the opening of the input end of the first-stage supercharging assembly (100) and the speed of the driving motor are increased; P0 is the pressure value of the input end of the first-stage supercharging assembly (100), P c2 is the pressure control threshold; if P1≤P obj And P0≤P c2 , then reducing the opening of the input end of the first-stage supercharging assembly (100) and the speed of the driving motor; When the two-stage supercharging assembly (200) is in operation, an actual pressure value P2 of the two-stage supercharging assembly (200) is obtained; if P1≥P2, the opening of the input end of the two-stage supercharging assembly (200) is increased; if P1<P2, the opening of the input end of the two-stage supercharging assembly (200) is reduced, and the rotation speed of the drive motor is increased.

2. The supply system according to claim 1, characterized in that The first-stage supercharging assembly (100) further includes a first-stage material storage component (130), the first-stage material storage component (130) includes a first-stage container (131), the output end of the first cylinder sleeve (122) is in one-way communication with the input end of the first-stage container (131), and the output end of the first-stage container (131) can selectively be in one-way communication with the input end of the main container (300), or in one-way communication with the input end of the second cylinder sleeve (222).

3. The supply system according to claim 2, characterized in that The output end of the primary container (131) can be in one-way communication with the input end of the second cylinder sleeve (222) through the second regulating valve (223).

4. The supply system according to claim 2, characterized in that The two-stage supercharging assembly (200) further includes a two-stage material storage component (230), the two-stage material storage component (230) includes a two-stage container (231), the output end of the second cylinder sleeve (222) is in one-way communication with the input end of the two-stage container (231), the output end of the two-stage container (231) can be in one-way communication with the input end of the main container (300), and the first-stage container (131) is in one-way communication with the main container (300) via the two-stage container (231).

5. The supply system according to claim 4, characterized in that The secondary storage assembly (230) further includes a third regulating valve (232), the input end of the third regulating valve (232) being connected to the output end of the secondary container (231), and the output end of the third regulating valve (232) being connected to the input end of the main container (300), and the third regulating valve (232) being capable of regulating the flow rate of the liquid fluid entering the main container (300).

6. The supply system according to claim 4 or 5, characterized in that: It also includes an evaporator (400), which is connected between the output end of the secondary container (231) and the input end of the main container (300).

7. A vehicle, characterized in that The invention comprises an engine and a supply system according to any one of claims 1 to 6, wherein in the second mode, the rotation speed of the secondary drive member (210) is positively correlated with the rotation speed of the engine.

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