Fluid control device and fluid fuel control method

Abstract

The invention discloses a fluid control device and a fluid fuel control method.The fluid control device comprises at least two pressure control assemblies, each pressure control assembly comprises a shell, a sealed inner barrel and an embedded pressure adjusting assembly, and a liquid inlet pipe with an electromagnetic valve is arranged on the top wall of each shell; the inner cylinder is longitudinally installed in an inner cavity of the shell, and a first communicating pipe communicating with the inner cavity of the shell is arranged on the bottom wall of the inner cylinder. A distance sensor and a first piston capable of sliding longitudinally are arranged in the inner cylinder, the distance sensor is located on the top wall of the inner cylinder, a second piston capable of sliding is arranged in the first communicating pipe, and the space between the first piston and the second piston is filled with pressure oil. Accurate control over the fluid outlet pressure can be achieved, adjustment can be conducted according to requirements for initial fluids with different pressures so as to obtain fluids with different outlet pressures, and accurate control and stable control over the outlet pressure are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of precise control of the outlet pressure of fuel cells, and particularly relates to a fluid control device and a fluid fuel control method. Background Art

[0002] A fuel cell is a power generation device that directly converts the chemical energy of fuel and oxidant into electrical energy through an electrode reaction. Among them, hydrogen is mainly used as fuel, but liquid hydrogen is the main development direction. Liquid hydrogen and oxygen undergo a reduction reaction to generate water, without producing pollutants such as nitrogen oxides, sulfur oxides, and carbon dioxide, and is environmentally friendly. New energy vehicles are one of the main application objects of fuel cells. Compared with lithium battery vehicles, they have many advantages, but there are also the following technical difficulties: Improving the pressure control accuracy of hydrogen fuel entering the combustion chamber has always been a difficult problem. At present, the form of a bellows is used for pressure control, but the outlet pressure fluctuation is uncontrollable, the fluctuation amplitude is unstable, and the pressure control method is extremely unstable and unreliable, which affects the reaction efficiency of the fuel cell. Therefore, there is an urgent need for a pressure control device and a pressure control method with stable pressure control. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the present invention provides a fluid control device, which includes at least two pressure control components. Each pressure control component includes a housing, a sealed inner cylinder, and an embedded pressure regulating component. The top wall of the housing is provided with a liquid inlet pipe with a solenoid valve; the inner cylinder is longitudinally installed in the inner cavity of the housing, and the bottom wall of the inner cylinder is provided with a first communication pipe communicating with the inner cavity of the housing; a distance sensor and a longitudinally slidable first piston are arranged inside the inner cylinder. The distance sensor is located on the top wall of the inner cylinder, and a slidable second piston is arranged inside the first communication pipe, and the space between the first piston and the second piston is filled with pressure oil; the embedded pressure regulating component is installed in the inner cavity of the housing, and the output pipe of the embedded pressure regulating component is communicated with the inner cylinder. By changing the amount of liquid metal on the first piston through the embedded pressure regulating component, the pressure of the liquid metal on the first piston is further adjusted; all the pressure control components are sequentially communicated through the liquid inlet pipe; an outlet release component is included, which is installed at the outlet of the last pressure control component. The bottom wall of the housing of the last pressure control component is provided with a liquid outlet pipe sealed at the lower end, and the bottom wall is further provided with a valve plate for controlling the on-off of the liquid outlet pipe. The valve plate can swing upwards to open the liquid outlet pipe, and the liquid outlet pipe is provided with an external connection pipe; the outlet release component includes a sealed outer cylinder, a connecting rod, and an external pressure regulating component; a longitudinally slidable third piston is arranged inside the outer cylinder. The lower end of the connecting rod penetrates through the outer cylinder and is fixedly connected to the upper surface of the third piston, and the upper end of the connecting rod penetrates through the liquid outlet pipe and contacts the valve plate; the bottom wall of the outer cylinder is provided with a second communication pipe communicating with the housing of the last pressure control component. A slidable fourth piston is arranged inside the second communication pipe, and the space between the third piston and the fourth piston is filled with pressure oil; the output pipe of the external pressure regulating component is communicated with the outer cylinder. By changing the amount of liquid metal on the third piston through the external pressure regulating component, the pressure of the liquid metal on the third piston is further adjusted.

[0004] A preferred solution of the fluid control device in the present invention is that each pressure control component includes an electromagnet located below the inner cylinder, and each electromagnet is directly opposite to the liquid metal on the upper surface of the corresponding first piston. The magnetic force generated by the electromagnet can change accordingly according to the magnitude of the current, and the suction force on the liquid metal can be adjusted in real time, so as to change the pressure generated on the first piston. The normal state of the liquid metal is a fluid, which can be sucked or extruded by the pressure regulating component, and the first piston is pressed by the gravity of the liquid metal. However, on bumpy and steep road conditions, the liquid metal has fluid characteristics and sways with the road conditions, and accordingly the pressure on the first piston is unstable. An electromagnetic force is applied to it by an electromagnet, thus avoiding the problem of unstable pressure on the first piston caused by swaying.

[0005] A preferred solution of the fluid control device in the present invention is that each solenoid valve is located at the lower end of the corresponding liquid inlet pipe, and a downward-opening one-way valve is provided at the upper end of each liquid inlet pipe.

[0006] The preferred solution of the fluid control device in the present invention is as follows: The embedded pressure regulating component includes a sealing cover and a first electric extruder sealed within the sealing cover. The sealing cover is installed on the bottom wall of the corresponding outer shell. The output pipe of the first electric extruder penetrates through the sealing cover and is communicated with the top wall of the corresponding inner cylinder. A telescopic pipe is provided inside each inner cylinder. The lower end of the telescopic pipe contacts the upper surface of the corresponding first piston, and flow holes are provided on the pipe wall at the lower end of the telescopic pipe. The upper end of the telescopic pipe penetrates through the inner cylinder and is communicated with the output pipe of the first electric extruder. The outer shell seals the first electric extruder, so high pressure cannot enter the outer shell, which does not affect the normal suction or extrusion operation of the first electric extruder. The output pipe of the first electric extruder is made of a metal high-pressure pipe, which does not deform and can resist both internal pressure and external pressure.

[0007] The preferred solution of the fluid control device in the present invention is as follows: The external pressure regulating component includes a second electric extruder and a bracket. The second electric extruder is installed outside the outer shell of the last pressure control component through the bracket, and the output pipe of the second electric extruder is communicated with the telescopic pipe on the top wall of the outer cylinder. The external pressure regulating component does not bear external pressure, and there is no requirement for external sealing. It only needs to use a bracket to meet the installation requirements, which reduces the equipment cost.

[0008] The preferred solution of the fluid control device in the present invention is that the cross-sectional areas of the first pistons from the first pressure control component to the last pressure control component decrease in sequence. The areas of the first pistons decrease in sequence, and the corresponding pressures increase in sequence. With the help of Pascal's principle, the amplification of the fuel supply pressure is realized, and the structure is stable and the reliability is high.

[0009] The beneficial effects of the fluid control device in the present invention are as follows: 1. The fuel is sprayed into the combustion chamber after being pressurized by a high-pressure pump, while the fluid control device uses multiple pressure control components to increase the pressure in sequence, and a low-pressure pump can meet the pipe pressure requirements, replacing the high-pressure pump.

[0010] 2. Compared with the existing corrugated pipe pressure control structure, the inner cylinder piston structure using Pascal's principle and the hydraulic oil transmitting pressure have better pressure control stability.

[0011] 3. The outlet release component also uses Pascal's principle, and the fuel can only be discharged from the external connection pipe when the release pressure reaches the set pressure, and the pressure control accuracy is higher.

[0012] 4. Multiple pressure control components increase the pressure in sequence, and the pressure difference between every two adjacent pressure control components is small. After multi-stage pressure control, the fuel pressure fluctuation can be greatly weakened, and the fluctuation amplitude is close to zero, which can improve the reaction efficiency of the fuel cell.

[0013] The present invention also provides a fluid fuel control method, which is based on the above-mentioned fluid control device and includes a controller. All the solenoid valves, all the distance sensors, all the first electric extruders and the second electric extruder are respectively electrically connected to the controller. The steps are as follows: First, according to the requirement of the fuel supply pressure P0, that is, the pressure requirement for injecting into the combustion chamber, set the opening pressure of the first pressure control component as P1, the opening pressure of the second pressure control component as P2... the opening pressure of the (N - 1)-th pressure control component as Pn - 1, and the closing pressure of the N-th pressure control component as Pn and the opening pressure as P0 on the controller, where Pn - 1 < P0 ≤ Pn. Then, energize the pressure control components. The controller makes the first electric extruder of the first pressure control component extrude an appropriate amount of liquid metal onto the corresponding first piston, so that the pressure required to push the first piston of the first pressure control component is P1. If the pressure cannot reach P1 even when all the liquid metal in the first electric extruder is extruded, the controller energizes the solenoid valve of the first pressure control component and gradually increases the current. The liquid metal is affected by the magnetic force to increase the pressure on the first piston until the pressure reaches P1. Using the same method as above, sequentially complete the pressure setting of the second pressure control component until the N-th pressure control component. The first electric extruder of the N-th pressure control component extrudes an appropriate amount of liquid metal onto the corresponding first piston, so that the pressure required to push the first piston of the N-th pressure control component is Pn. At the same time, the second electric extruder of the N-th pressure control component extrudes an appropriate amount of liquid metal onto the corresponding third piston, so that the pressure required to push the third piston of the N-th pressure control component is P0. Then connect the pipeline, that is, the liquid inlet pipe of the first pressure control component is connected to the external connection pipe and communicated to the fuel supply pipeline. Finally, supply fuel. The controller opens the solenoid valve of the first pressure control component, and the fuel enters the housing of the first pressure control component. The fuel in the housing increases, and the pressure continuously increases. The second piston pushes the first piston upward to the position sensor; during the pushing process, if the solenoid valve is in the energized state, the magnetic force of the solenoid valve increases correspondingly as the first piston moves upward, so that the pressure of the liquid metal on the first piston remains unchanged; the solenoid valve of the first pressure control component is closed, and at the same time, the solenoid valve of the second pressure control component is opened. Using the same method, the fuel sequentially enters the housing of the second pressure control component until the fuel enters the housing of the N-th pressure control component; when the pressure reaches P0, the fourth piston pushes the third piston upward to the position sensor, and the connecting rod pushes open the valve plate, and the fuel enters the liquid outlet pipe and is discharged from the external connection pipe to the fuel supply pipeline; when the pressure is lower than P0, the connecting rod drives the third piston to move downward and pushes the fourth piston to move reversely in the second communication pipe until the valve plate is closed. Subsequently, the pressure increases to P0 again, and the valve plate opens again, and the cycle continues to supply fuel.If the fuel supply pipeline needs to stop supplying fuel, the controller causes the second electric extruder of the Nth pressure control component to add liquid metal to the corresponding third piston, so that the pressure P0 required to push the third piston of the Nth pressure control component increases to be greater than Pn. Subsequently, the pressure of the Nth pressure control component increases to Pn, and the controller closes the solenoid valve of the Nth pressure control component. Subsequently, the solenoid valve of the (N - 1)th pressure control component is closed until the solenoid valve of the first pressure control component is closed, that is, the first pressure control component to the Nth pressure control component correspondingly maintain pressures P1, P2....Pn and are in a pressure holding state. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 Structural schematic diagram of the fluid control device in the present invention; Figure 2 is Figure 1 partial enlarged view in Figure 3 is Figure 1 schematic diagram after hiding part of the outer shell, part of the inner cylinder and part of the sealing cover in Figure 4 is Figure 3 enlarged view at A in Figure 5 Principle diagram of the last pressure control component in the present invention.

[0016] Reference numerals: pressure control component 1, outer shell 101, inner cylinder 102, liquid inlet pipe 103, solenoid valve 104, check valve 105, first communication pipe 106, distance sensor 107, first piston 108, second piston 109, liquid outlet pipe 110, valve plate 111, sink 112, external connection pipe 113, embedded pressure regulating component 2, sealing cover 201, first electric extruder 202, output pipe 203, telescopic pipe 204, flow through hole 205, electromagnet 206, outlet release component 3, outer cylinder 301, connecting rod 302, third piston 303, second communication pipe 304, fourth piston 305, external pressure regulating component 4, second electric extruder 401, bracket 402. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In view of the deficiencies in the prior art, the inventors of this case have, through long-term research and a large number of practices, been able to propose the technical solution of the present invention. The following will further explain the technical solution, its implementation process, principles, etc. in combination with the drawings in the embodiments of this application and specific implementation cases.

[0018] Embodiment 1: As Figure 1 shown, Embodiment 1 provides a fluid control device, which includes four pressure control components 1, but is not limited to four, and can be three, two or more. Each pressure control component 1 includes a housing 101, a sealed inner cylinder 102 and an embedded pressure regulating component 2. The top wall of the housing 101 is provided with a liquid inlet pipe 103 with a solenoid valve 104. Specifically, each solenoid valve 104 is located at the lower end of the corresponding liquid inlet pipe 103, and the upper end of each liquid inlet pipe 103 is provided with a check valve 105 that opens downward. The liquid inlet pipe 103 and the corresponding check valve 105 of the second housing 101 extend into the inner cavity of the first housing 101, and the liquid inlet pipe 103 and the corresponding check valve 105 of the third housing 101 extend into the inner cavity of the second housing 101, and so on, so that all the pressure control components 1 are sequentially connected through the liquid inlet pipes 103.

[0019] The inner cylinder 102 of each pressure control component 1 is longitudinally installed in the inner cavity of the corresponding housing 101. Specifically, the inner cylinder 102 is fixed to the bottom wall of the housing 101 by multiple fixing rods, so that the bottom wall of the inner cylinder 102 is suspended, and the bottom wall of the inner cylinder 102 is provided with a first communication pipe 106 that communicates with the inner cavity of the housing 101. A distance sensor 107 and a longitudinally slidable first piston 108 are provided inside the inner cylinder 102. The distance sensor 107 is located on the top wall of the inner cylinder 102, and a slidable second piston 109 is provided inside the first communication pipe 106, and the space between the first piston 108 and the second piston 109 is filled with pressure oil. The first communication pipe 106 is U-shaped, and the end of the first communication pipe 106 is provided with a limit ring that restricts the second piston 109 from sliding out of the end of the first communication pipe 106. The limit ring is not shown in the figure. In addition, in this embodiment, the cross-sectional areas of the first pistons 108 from the first pressure control component 1 to the last pressure control component 1 decrease in sequence. The areas of the first pistons 108 decrease in sequence, and the corresponding pressures increase in sequence. By means of Pascal's principle, the fuel supply pressure is amplified, the structure is stable, and the reliability is high.

[0020] The embedded pressure regulating component 2 in this embodiment is installed in the inner cavity of the housing 101. The output pipe 203 of the embedded pressure regulating component 2 communicates with the inner cylinder 102. By changing the amount of liquid metal on the first piston 108 through the embedded pressure regulating component 2, the pressure of the liquid metal on the first piston 108 is adjusted. The specific structure of the embedded pressure regulating component 2 is as follows: The embedded pressure regulating component 2 includes a sealing cover 201 and a first electric extruder 202 sealed within the sealing cover 201. The sealing cover 201 is installed on the bottom wall of the corresponding outer shell 101. The output pipe 203 of the first electric extruder 202 penetrates through the sealing cover 201 and communicates with the top wall of the corresponding inner cylinder 102. A telescopic pipe 204 is provided inside each inner cylinder 102. The lower end of the telescopic pipe 204 contacts the upper surface of the corresponding first piston 108, and through holes 205 are provided on the pipe wall at the lower end of the telescopic pipe 204. The upper end of the telescopic pipe 204 penetrates through the inner cylinder 102 and communicates with the output pipe 203 of the first electric extruder 202. The function of the telescopic pipe 204 is to keep the lower end of the telescopic pipe 204 in contact with the first piston 108 during the up and down movement of the first piston 108, which is beneficial for the first electric extruder 202 to suck the liquid metal and prevent the lower end of the telescopic pipe 204 from exposing above the liquid level of the liquid metal and being unable to suck the liquid metal. The outer shell 101 seals the first electric extruder 202, so that high pressure cannot enter the outer shell 101, which does not affect the normal sucking or extruding action of the first electric extruder 202. The output pipe 203 of the first electric extruder 202 is made of a metal high-pressure pipe, which does not deform and can resist both internal pressure and external pressure. In addition, each pressure control component 1 includes an electromagnet 206 located below the inner cylinder 102, and each electromagnet 206 is directly opposite to the liquid metal on the upper surface of the corresponding first piston 108. The magnetic force generated by the electromagnet 206 can change accordingly according to the magnitude of the current, and the suction force on the liquid metal can be adjusted in real time, so as to change the pressure exerted on the first piston 108. The normal state of the liquid metal is a fluid, which can be sucked or extruded by the pressure regulating component. The first piston 108 is pressed by the gravity of the liquid metal. However, on bumpy and steep road conditions, the liquid metal has fluid characteristics and sways with the road conditions, and accordingly the pressure on the first piston 108 is unstable. By applying a tensile stress to it with the electromagnet 206, the problem of unstable pressure on the first piston 108 caused by swaying is avoided.

[0021] This embodiment further includes an outlet release component 3 installed at the outlet of the last pressure control component 1. The bottom wall of the outer shell 101 of the last pressure control component 1 is provided with a liquid outlet pipe 110 sealed at the lower end, and the bottom wall is also provided with a valve plate 111 for controlling the on-off of the liquid outlet pipe 110. A sunken groove 112 adapted to the valve plate 111 is provided on the bottom wall. Two opposite sides of the valve plate 111 are respectively hinged to two opposite side walls of the sunken groove 112. The valve plate 111 can swing upward to open the liquid outlet pipe 110, and the liquid outlet pipe 110 is provided with an external connection pipe 113.

[0022] The described outlet release assembly 3 includes a sealed outer cylinder 301, a connecting rod 302, and an external pressure regulating assembly 4. Inside the outer cylinder 301, there is a third piston 303 that can slide longitudinally. The lower end of the connecting rod 302 passes through the outer cylinder 301 and is fixedly connected to the upper surface of the third piston 303, and the upper end of the connecting rod 302 passes through the liquid outlet pipe 110 and contacts the valve plate 111. The bottom wall of the outer cylinder 301 is provided with a second communication pipe 304 that communicates with the housing 101 of the last pressure control assembly 1. Inside the second communication pipe 304, there is a slidable fourth piston 305, and the space between the third piston 303 and the fourth piston 305 is filled with pressure oil. The output pipe 203 of the external pressure regulating assembly 4 is communicated with the outer cylinder 301. Similarly, a telescopic pipe 204 is also provided inside the outer cylinder 301 to maintain the suction of the output pipe 203 for the liquid metal. By changing the amount of liquid metal on the third piston 303 through the external pressure regulating assembly 4, the pressure of the liquid metal on the third piston 303 is further adjusted.

[0023] The specific structure of the external pressure regulating assembly 4 includes a second electric extruder 401 and a bracket 402. The second electric extruder 401 is installed outside the housing 101 of the last pressure control assembly 1 through the bracket 402, and the output pipe 203 of the second electric extruder 401 is communicated with the telescopic pipe 204 on the top wall of the outer cylinder 301. The external pressure regulating assembly 4 does not bear external pressure, and there is no requirement for external sealing. It only needs to meet the installation requirements with the bracket 402, reducing the equipment cost.

[0024] This embodiment can achieve precise control of the fluid outlet pressure. For initial fluids with different pressures, in order to obtain fluids with different outlet pressures, it can be adjusted according to requirements, truly achieving precise and stable control of the outlet pressure. At the same time, with the help of the pressure transmission device based on Pascal's principle, it perfectly utilizes the "lever principle" to achieve force amplification, thereby ensuring the reliability of pressure control inside each pressure control assembly 1.

[0025] There are two purposes for using liquid metal in this embodiment. One is to increase the pressure on the piston. Conventional liquids have a small specific gravity and can provide a small pressure. If the pressure is increased, a large amount of solution is required, which will increase the volume of the entire device and require a large installation space, making it not suitable as a component for new energy vehicles. The other is to cooperate with the electromagnet 206. When used in combination, they can cope with bumpy and steep road conditions, and even situations where the vehicle body inclination is greater than 90°, that is, special situations such as rollover and falling can still maintain fuel supply. Metals that are in a liquid state under normal conditions, in addition to mercury, also include gallium-indium alloy, gallium-indium eutectic alloy, and gallium-indium-tin alloy. In order to be attracted by magnetic force or increase magnetism, ferromagnetic elements such as iron, nickel, and cobalt can be added to them.

[0026] Embodiment Two: Embodiment 2 provides a fluid fuel control method. Based on the fluid control device of Embodiment 1, this embodiment includes a controller. All solenoid valves 104, all distance sensors 107, all first electric extruders 202, and the second electric extruder 401 are electrically connected to the controller respectively. The controller here can be an ECU, that is, the electronic control unit of a new energy vehicle, which can be programmed according to requirements. It is also possible to add a separate controller on the new energy vehicle to control the fluid control device, and this embodiment does not make any restrictions. The specific method is as follows: First, according to the fuel supply pressure P0 requirement, that is, the pressure requirement for injecting into the combustion chamber, set the opening pressure of the first pressure control component 1 as P1, the opening pressure of the second pressure control component 1 as P2, the opening pressure of the third pressure control component 1 as P3, the closing pressure of the fourth pressure control component 1 as P4 and the opening pressure as P0 on the controller, where P3 < P0 ≤ P4.

[0027] Then, energize the pressure control component 1. The controller makes the first electric extruder 202 of the first pressure control component 1 extrude an appropriate amount of liquid metal onto the corresponding first piston 108, so that the pressure required to push the first piston 108 of the first pressure control component 1 is P1. If the pressure still cannot reach P1 after all the liquid metal in the first electric extruder 202 is extruded, the controller energizes the solenoid valve 104 of the first pressure control component 1 and gradually increases the current. The liquid metal is affected by the magnetic force to increase the pressure on the first piston 108 until the pressure reaches P1. Using the same method as above, sequentially complete the pressure setting of the second and third pressure control components 1 until the fourth pressure control component 1. The first electric extruder 202 of the fourth pressure control component 1 extrudes an appropriate amount of liquid metal onto the corresponding first piston 108, so that the pressure required to push the first piston 108 of the fourth pressure control component 1 is P4. At the same time, the second electric extruder 401 of the fourth pressure control component 1 extrudes an appropriate amount of liquid metal onto the corresponding third piston 303, so that the pressure required to push the third piston 303 of the fourth pressure control component 1 is P0.

[0028] Then, connect the pipeline, that is, the liquid inlet pipe 103 of the first pressure control component 1 is communicated with the external connecting pipe 113 and connected to the fuel supply pipeline.

[0029] Finally, fuel is supplied. The controller opens the solenoid valve 104 of the first pressure control component 1, and fuel enters the housing 101 of the first pressure control component 1. The fuel in the housing 101 increases, and the pressure continuously rises. The second piston 109 pushes the first piston 108 upward to the position of the distance sensor 107. During the pushing process, if the solenoid valve 104 is in the energized state, the magnetic force of the solenoid valve 104 increases correspondingly as the first piston 108 moves upward, so that the pressure of the liquid metal on the first piston 108 remains unchanged. The solenoid valve 104 of the first pressure control component 1 is closed, and at the same time, the solenoid valve 104 of the second pressure control component 1 is opened. Using the same method, fuel enters the housing 101 of the second pressure control component 1 in sequence until fuel enters the housing 101 of the fourth pressure control component 1. When the pressure reaches P0, the fourth piston 305 pushes the third piston 303 upward to the position of the distance sensor 107, and the connecting rod 302 pushes open the valve plate 111. Fuel enters the liquid outlet pipe 110 and is discharged from the outer connecting pipe 113 to the fuel supply pipeline. When the pressure is lower than P0, the connecting rod 302 drives the third piston 303 to move downward and pushes the fourth piston 305 to move reversely in the second connecting pipe 304 until the valve plate 111 closes. Subsequently, the pressure increases to P0 again, and the valve plate 111 opens again. Thus, the cycle continues to supply fuel.

[0030] If the fuel supply pipeline needs to stop supplying fuel, the controller makes the second electric extruder 401 of the fourth pressure control component 1 add liquid metal to the corresponding third piston 303, so that the pressure P0 required to push the third piston 303 of the fourth pressure control component 1 increases to be greater than P4. Subsequently, the pressure of the fourth pressure control component 1 increases to P4. The controller closes the solenoid valve 104 of the fourth pressure control component 1, and then closes the solenoid valve 104 of the third pressure control component 1 until the solenoid valve 104 of the first pressure control component 1 is closed, that is, the first pressure control component 1 to the fourth pressure control component 1 maintain pressures P1, P2, P3, and P4 respectively and are in the pressure holding state, preparing for the next fuel supply. For example, in the case of temporary parking, automatic start-stop, etc., in these situations, the fluid control device is in the pressure holding state and is ready to start the combustion chamber at any time.

[0031] The fluid fuel control method of this embodiment can be used for liquid fuel or gas fuel without limitation. Multiple pressure control components 1 increase the pressure in sequence, and the pressure difference between every two adjacent pressure control components 1 is small. After multi-stage pressure control, the fuel pressure fluctuation can be greatly weakened, and the fluctuation amplitude is close to zero, which can improve the reaction efficiency of the fuel cell.

[0032] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can still be made. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A fluid control device, characterized in that: It comprises at least two pressure control assemblies, each of which comprises an outer shell, a sealed inner cylinder and an embedded pressure regulating assembly, the top wall of the outer shell is provided with a liquid inlet pipe with an electromagnetic valve; the inner cylinder is longitudinally installed in the inner cavity of the outer shell, and the bottom wall of the inner cylinder is provided with a first connecting pipe communicating with the inner cavity of the outer shell; a distance sensor and a first piston that can slide longitudinally are provided inside the inner cylinder, the distance sensor is located on the top wall of the inner cylinder, and a second piston that can slide inside the first connecting pipe is provided, and the space between the first piston and the second piston is filled with pressure oil; the embedded pressure regulating assembly is installed in the inner cavity of the outer shell, and the output pipe of the embedded pressure regulating assembly is communicated with the inner cylinder; All the pressure control components are connected in sequence through the liquid inlet pipe; It comprises an outlet release assembly installed on the last pressure control assembly, the bottom wall of the shell of the last pressure control assembly is provided with a liquid outlet pipe with a sealed lower end and a valve plate for controlling the opening and closing of the liquid outlet pipe, the valve plate can swing upward to open the liquid outlet pipe, and the liquid outlet pipe is provided with an external pipe; the outlet release assembly comprises a sealed outer cylinder, a connecting rod and an external pressure regulating assembly; the interior of the outer cylinder is provided with a third piston which can slide longitudinally, the lower end of the connecting rod passes through the outer cylinder and is fixedly connected to the top of the third piston, and the upper end of the connecting rod passes through the liquid outlet pipe and contacts with the valve plate; the bottom wall of the outer cylinder is provided with a second connecting pipe which is connected to the shell of the last pressure control assembly, the second connecting pipe is provided with a slidable fourth piston and the space between the third piston and the fourth piston is filled with pressurized oil; the output pipe of the external pressure regulating assembly is connected to the outer cylinder.

2. A fluid control device according to claim 1, characterized in that: Each pressure control assembly includes an electromagnet located below the inner cylinder, and each electromagnet is directly opposite to the liquid metal on the upper surface of the corresponding first piston.

3. A fluid control device according to claim 1, characterized in that: Each solenoid valve is located at the lower end of the corresponding liquid inlet pipe, and the upper end of each liquid inlet pipe is provided with a one-way valve which opens downwards.

4. A fluid control device according to claim 2, characterized in that: The embedded pressure regulating assembly includes a sealing cover and a first electric extruder sealed in the sealing cover, wherein the sealing cover is installed on the bottom wall of the corresponding outer shell, and the output pipe of the first electric extruder passes through the sealing cover and is communicated with the top wall of the corresponding inner cylinder; a telescopic tube is provided inside each inner cylinder, the lower end of the telescopic tube contacts the upper surface of the corresponding first piston and the tube wall at the lower end of the telescopic tube is provided with a flow hole, and the upper end of the telescopic tube passes through the inner cylinder and is communicated with the output pipe of the first electric extruder.

5. A fluid control device according to claim 4, characterized in that: The external pressure regulating assembly includes a second electric extruder and a bracket. The second electric extruder is installed outside the shell of the last pressure controlling assembly through the bracket, and the output pipe of the second electric extruder is connected to the telescopic pipe on the top wall of the outer cylinder.

6. A fluid control device according to claim 5, characterized in that: The cross-sectional areas of the first piston of the first pressure control assembly to the first piston of the last pressure control assembly decrease successively.

7. A fluid fuel control method, characterized in that: The fluid control device according to claim 6 comprises a controller, all solenoid valves, all distance sensors, all first electric extruders and second electric extruders are electrically connected to the controller respectively, and the steps are as follows: S1. According to the fuel supply pressure P0 requirement, the opening pressure of the first pressure control component is set to P1, the opening pressure of the second pressure control component is set to P2, ... the opening pressure of the N-1th pressure control component is set to Pn-1, the closing pressure of the Nth pressure control component is set to Pn and the opening pressure is set to P0, Pn-1<P0≤Pn; S2, the controller makes the first electric extruder of the first pressure control component extrude an appropriate amount of liquid metal onto the corresponding first piston, so that the pressure required to push the first piston of the first pressure control component is P1. If all the liquid metal in the first electric extruder is extruded and still cannot reach P1, the controller energizes the solenoid valve of the first pressure control component and gradually increases the current, and the liquid metal is affected by the magnetic force to increase the pressure on the first piston until the pressure reaches P1; S3, using the same method as S2, sequentially completing the pressure setting of the second pressure control component until the Nth pressure control component, the first electric extruder of the Nth pressure control component extrude an appropriate amount of liquid metal onto the corresponding first piston, so that the pressure required to push the first piston of the Nth pressure control component is Pn, and at the same time, the second electric extruder of the Nth pressure control component extrude an appropriate amount of liquid metal onto the corresponding third piston, so that the pressure required to push the third piston of the Nth pressure control component is P0; S4, connecting the liquid inlet pipe of the first pressure control component and the external pipe to the fuel supply pipeline; S5. The controller opens the solenoid valve of the first pressure control component, and the fuel enters the shell of the first pressure control component. The fuel in the shell increases, the pressure increases continuously, and the second piston pushes the first piston to move up to the distance sensor. During the pushing process, if the solenoid valve is in the energized state, the magnetic force of the solenoid valve increases accordingly as the first piston moves up, so that the pressure of the liquid metal on the first piston remains unchanged. The solenoid valve of the first pressure control component is closed, and the solenoid valve of the second pressure control component is opened at the same time. S6, using the same method as S5, the fuel sequentially enters the housing of the second pressure control component until the fuel enters the housing of the Nth pressure control component; when the pressure reaches P0, the fourth piston pushes the third piston upward to the distance sensor, the connecting rod pushes open the valve plate, the fuel enters the liquid outlet pipe and is discharged from the external pipe to the fuel supply pipeline; when the pressure is lower than P0, the connecting rod drives the third piston downward and pushes the fourth piston to move in the opposite direction in the second connecting pipe until the valve plate is closed, and then the pressure increases to P0 again, the valve plate opens again, and the material is continuously supplied in this cycle; S7. In S6, if the fuel supply pipeline needs to stop feeding, the controller causes the second electric extruder of the Nth pressure control component to add liquid metal to the corresponding third piston, so that the pressure P0 required to push the third piston of the Nth pressure control component increases to greater than Pn, and then the pressure of the Nth pressure control component increases to Pn, and the controller closes the solenoid valve of the Nth pressure control component, and then closes the solenoid valve of the N-1th pressure control component, until the solenoid valve of the first pressure control component is closed, that is, the first pressure control component to the Nth pressure control component respectively maintain the pressures of P1, P2,...Pn and are in a pressure maintaining state.

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