Liquid fluid pressurization method, liquid fluid supply system and vehicle

Abstract

The invention relates to the technical field of vehicle engineering, and provides a liquid fluid pressurization method, a supply system and a vehicle. According to target parameters under the current working condition, the working modes matched with the target parameters can be selected, namely, the first mode that only the first-stage supercharging assembly supercharges liquid fluid and the second mode that the first-stage supercharging assembly and the second-stage supercharging assembly sequentially supercharge the liquid fluid are selected. When the first-stage pressurizing assembly works, the opening degree of the input end of the first-stage pressurizing assembly and the rotating speed of a driving motor of the first-stage pressurizing assembly can be adjusted according to the initial pressure value of liquid fluid, and when the second-stage pressurizing assembly works, the opening degree of the input end of the first-stage pressurizing assembly can be adjusted according to the pressure value of the liquid fluid pressurized by the first-stage pressurizing assembly. And the opening degree of the input end and the rotating speed of a driving motor of the first-stage supercharging assembly are adjusted. In this way, the pump evacuation tendency caused by negative pressure conveying of liquid and steam can be reduced or eliminated, and the energy utilization rate of a low-temperature fuel high-pressure supply system can be improved.

Description

Technical Field

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

[0002] Liquefied natural gas (LNG) is usually stored in cryogenic storage tanks at a temperature of approximately -150 to -115°C and a pressure of 5 to 20 bar. In order to allow natural gas to be directly injected into the cylinder at high pressure at the end of the compression stroke of the internal combustion engine piston, an LNG cryogenic booster pump and a high-pressure supply system are usually required.

[0003] The prior art cryogenic booster pump requires a positive delivery pressure in order to prevent or reduce the tendency of the pump to be emptied. One method is to place the cryogenic pump directly in the liquid to supply the desired positive pressure. When the cryogenic pump drives the pressurized liquid LNG, a large amount of heat is leaked into the LNG cryogenic storage tank, which is undesirable. Another method is to place the cryogenic pump outside the cryogenic storage tank. Under the rapid suction of the cryogenic pump, negative pressure may occur to deliver liquid and vapor, and the vapor may cause the pump to be emptied.

[0004] Therefore, there is an urgent need for a liquid fluid pressurization method, a supply system and a 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 comprises a primary pressurization assembly, a secondary pressurization assembly and a main container, and the liquid fluid pressurization method comprises:

[0008] Get the 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 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.

[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 lower dead point.

[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, and the above-mentioned first regulating valve is installed at the input end of the above-mentioned first cylinder liner 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 with 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, and the above-mentioned first-stage container is connected with 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 rotation speed of the above-mentioned secondary driving component is positively correlated with the rotation 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, wherein the supply system includes a primary pressurization assembly, a secondary pressurization assembly and a main container, and the liquid fluid pressurization method includes:

[0022] Get the 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, the opening of the input end of the first-stage supercharging assembly and the speed of its driving motor are increased; P0 is the pressure value at 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 determines which working mode is the preferred 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-stage supercharging assembly and the second-stage supercharging assembly in turn before entering the main container; in this way, the second-stage supercharging assembly is selectively activated to avoid energy loss. When the first-stage supercharging 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 P c2 The opening of the input end and the rotation speed of the first-stage driving component can be adjusted according to the size relationship of the liquid fluid pressure values ​​P2 and P1 at the input end when the second-stage boost assembly is operating; the pump evacuation tendency caused by negative pressure delivery of liquid and steam can be reduced or eliminated, which 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 the description of 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 paying any creative work.

[0027] Figure 1 It is a structural schematic diagram of a primary supercharging assembly and a secondary supercharging assembly provided in an embodiment of the present invention;

[0028] Figure 2It is a structural schematic diagram of a first-stage booster assembly and a main container provided in an embodiment of the present invention;

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

[0030] In the figure:

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

[0032] 200, secondary booster assembly; 210, secondary drive member; 220, secondary piston assembly; 221, second piston; 222, second cylinder sleeve; 2221, second compression chamber; 223, second regulating valve; 224, fourth one-way valve; 225, fifth one-way valve; 230, secondary material 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 in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

[0039] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0040] The present invention provides a liquid fluid pressurization method, which is applicable to a supply system. The supply system includes a primary pressurization assembly 100, a secondary pressurization assembly 200 and a main container 300. The liquid fluid pressurization method includes:

[0041] Get the 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 , the opening of the input end of the first-stage supercharging assembly 100 and the speed of its driving motor are increased; P0 is the pressure value at 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 input opening 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 input opening of the two-stage supercharging assembly 200 is increased. If P1<P2, the input opening 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 determines which working mode is the preferred 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 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 booster 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 tendency 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, nitrogen, etc.

[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, 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] Exemplarily, 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 circumferential 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, and the first compression chamber 1221 can be changed. The volume of the first compression chamber 1221 is reduced, and its internal pressure increases when the first piston 121 moves to its upper dead center, so that the liquid fluid inside it is squeezed and worked to achieve the effect of initial pressurization. The liquid fluid can be discharged from the output end of the first cylinder liner 122. When the first piston 121 moves to its lower 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] Exemplarily, 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 circumferential 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, and the second compression chamber 222 can be changed. The volume of the second compression chamber 2221 is reduced, and its internal pressure increases when the second piston 221 moves to its upper dead center, so that the liquid fluid inside it is squeezed and worked to achieve the effect of pressurization. The liquid fluid can be discharged from the output end of the second cylinder liner 222. When the second piston 221 moves to its lower 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 of the piston at its maximum stroke into the cylinder liner, and the bottom dead center of the piston is the position of the piston at its 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 supercharging assembly 100 and then enters the main container 300, and the second-stage supercharging 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, 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 transmission-connected to the first piston 121, and there is always a movable gap between the two due to the influence of the assembly process or the processing process. 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 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 motion, a period of time later, the first piston 121 responds to the drive of the first-stage driving member 110 and starts the return motion. When the first piston 121 moves to a distance H2' from its top dead center, H2'<H2, the output end of the first-stage driving member 110 has completed the return motion, and re-initiates the process motion, that is, moves from the bottom dead center to the top dead center, and meets the first piston 121 that has not completed the return motion on the way, and drives 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 , which 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 acting end of the elastic member 123 abuts against the axial end face of the first cylinder sleeve 122, and the other acting end abuts against the first piston 121. When the primary 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 primary 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 primary driving member 110, so that the first piston 121 can be close to the primary driving member 110, complete the return action and can respond immediately.

[0055] Such a configuration 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] Exemplarily, 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 boosting assembly 100 also includes a first-stage material 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-stage material 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-stage container 131. The second one-way valve 126 allows liquid fluid to flow from the first cylinder sleeve 122 to the first-stage container 131 in one direction, and is used to prevent the liquid fluid in the first-stage 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-stage container 131.

[0062] Exemplarily, the first-level material 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 primary 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 primary container 131 and the second cylinder sleeve 222, and can control the flow rate of liquid fluid from the primary container 131 into the second cylinder sleeve 222 when the primary container 131 and the second cylinder sleeve 222 are in a connected state.

[0065] Exemplarily, the fourth one-way valve 224 is arranged at the input end and / or the output end of the second regulating valve 223. The fourth one-way valve 224 allows the liquid fluid to flow unidirectionally 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 the one-way connection between the primary container 131 and the second cylinder sleeve 222.

[0066] Optionally, the secondary boosting assembly 200 further includes a secondary storage component 230, which includes a secondary container 231. The output end of the second cylinder sleeve 222 is unidirectionally connected to the input end of the secondary container 231, and the output end of the secondary container 231 can be unidirectionally circulated with the input end of the main container 300. The primary container 131 is connected to the main container 300 through the secondary container 231. In this way, the liquid fluid pressurized by the primary boosting assembly 100 or the liquid fluid pressurized by the primary boosting assembly 100 and the secondary boosting assembly 200 can be stored in the secondary container 231 so that it can be retrieved and used at any time. When the liquid fluid is output, its supply continuity is stable.

[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, thereby 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 the 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 end of the secondary container 231 and the input end of the main container 300. The low-temperature and high-pressure liquid fluid passes through the evaporator 400, and heat exchange occurs in the evaporator 400, and the liquid fluid absorbs heat and vaporizes, and is converted 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 P and P can be used to determine whether the supply system should execute the first mode or the second mode under this 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 passes through the first storage assembly 130, the second storage assembly 230 and the main container 300 in sequence after being pressurized by the first booster assembly 100; 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 container 131 with the input end of the second cylinder sleeve 222, so that the liquid fluid can enter the second boosting assembly 200 through the second regulating valve 223 for re-boosting after being pressurized by the first boosting assembly 100, and then flow through the second 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 enter the secondary container 231 through the third one-way valve 133 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, so that when the second mode is executed, the liquid fluid in the first-level container 131 is directed to the second cylinder sleeve 222.

[0073] Furthermore, the first-stage supercharging assembly 100 further 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 sleeve 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 connected to the control unit 500 for communication, and the control unit 500 can obtain P0 and P1, and can judge P1 and P2 respectively. 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 primary driving member 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 sleeve 122 is relatively low, and it is easy to be evacuated. That is, in an ideal state, all the fluid entering the first cylinder sleeve 122 is liquid, but when P0≤P c2 When the first cylinder liner 122 is inflated, part of the 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 supercharging assembly 200 further includes a third pressure sensor 233, which is installed on the two-stage container 231 and is used to obtain the value of P2, where P2 is the actual pressure value of the two-stage supercharging assembly 200. The third pressure sensor 233 is in communication connection with the control unit 500, and when executing the second mode, the control unit 500 obtains the value of P2 and can determine the magnitude 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 relatively 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. 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 connected to the control unit 500 for communication. The control unit 500 can obtain P2 and P3 respectively, and can obtain ΔP=P3-P2. According to 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 the pressure decreases when the liquid fluid velocity increases, and the pressure increases when the liquid fluid velocity decreases. 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 △T=T2-T1. According to △T, the working state of the evaporator 400 is judged. If △T<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 △T>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 to reduce the heat exchange time of the liquid fluid in the heat exchanger. It should be noted that T 阈1 With T 阈2 It is 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 particularly 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 the control 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 to better meet the supply requirements of the supply system for higher pressure and larger flow.

[0087] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A liquid fluid pressurization method, applicable to a supply system, wherein the supply system comprises a primary pressurization assembly (100), a secondary pressurization assembly (200) and a main container (300), characterized in that: The liquid fluid pressurization method comprises: Get the target pressure P obj If P obj ≤P c1 , the first mode is executed, the liquid fluid is pressurized by the first-stage pressurizing assembly (100) and then passes into the main container (300), and the second-stage pressurizing 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 before entering the main container (300); 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 , the opening of the input end of the first-stage supercharging assembly (100) and the speed of its driving motor are increased; P0 is the pressure value at 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 its driving motor; When the two-stage supercharging assembly (200) is working, 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 driving motor is increased.

2. A supply system, suitable for the liquid fluid pressurization method according to claim 1, characterized in that: The first-stage boosting assembly (100) comprises a first-stage driving component (110) and a first-stage piston assembly (120), wherein the first-stage piston assembly (120) comprises a first piston (121) and a first cylinder sleeve (122), wherein the first-stage driving component (110) drives the first piston (121) to perform reciprocating motion along an axis in the first cylinder sleeve (122), and the first-stage driving component (110) is the driving motor; the second-stage boosting assembly (200) comprises a second-stage driving component (210) and a second-stage piston assembly (22 0), the secondary piston assembly (220) comprises a second piston (221) and a second cylinder sleeve (222), the secondary driving member (210) drives the second piston (221) to move back and forth 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 communicate 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).

3. The supply system according to claim 2, characterized in that: The first-stage piston assembly (120) further comprises 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.

4. The supply system according to claim 2, characterized in that: The first-stage supercharging assembly (100) further comprises a first regulating valve (124), wherein the first regulating valve (124) 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).

5. The supply system according to claim 2, characterized in that: The first-stage supercharging assembly (100) further comprises a first-stage material storage component (130), wherein the first-stage material storage component (130) comprises a first-stage container (131), wherein the output end of the first cylinder sleeve (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 selectively be unidirectionally connected to the input end of the main container (300), or unidirectionally connected to the input end of the second cylinder sleeve (222).

6. The supply system according to claim 5, characterized in that: The two-stage supercharging assembly (200) further comprises 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 sleeve (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 sleeve (222).

7. The supply system according to claim 5, characterized in that: The two-stage supercharging assembly (200) further comprises a two-stage material storage component (230), wherein the two-stage material storage component (230) comprises a two-stage container (231), wherein the output end of the second cylinder sleeve (222) is unidirectionally connected to the input end of the two-stage container (231), the output end of the two-stage container (231) is capable of unidirectionally communicating with the input end of the main container (300), and the first-stage container (131) is connected to the main container (300) via the two-stage container (231).

8. The supply system according to claim 7, characterized in that: 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), the output end of the third regulating valve (232) is connected to the input end of the main container (300), and the third regulating valve (232) can adjust the flow rate of the liquid fluid entering the main container (300).

9. The supply system according to claim 7 or 8, 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).

10. A vehicle, characterized in that It comprises an engine and a supply system as claimed in any one of claims 2 to 9, wherein in the second mode, the rotation speed of the secondary drive element (210) is positively correlated with the rotation speed of the engine.

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