Hydrogen variable-stage compression reciprocating piston type compressor unit

Abstract

The invention discloses a hydrogen variable-stage compression reciprocating piston type compressor unit, and relates to the technical field of hydrogen compression. Comprising a rack, a first-stage reciprocating piston type compressor, a second-stage reciprocating piston type compressor and a third-stage reciprocating piston type compressor which are mounted at the bottom of the rack in the Y-axis direction, and a variable-stage air guide pipe group mounted at the air inlet end of a cylinder body of the first-stage reciprocating piston type compressor, and a second-stage air inlet pipe is arranged between the air outlet end of the air storage tank of the first-stage reciprocating piston type compressor and the air inlet end of the cylinder body of the second-stage reciprocating piston type compressor. The high-pressure hydrogen is allowed to be directly switched into the low-pressure stage, the middle-pressure stage and the high-pressure stage of the compressor unit through dynamic dispatching of the valves of the variable-stage gas guide pipe set, so that the residual high-pressure potential energy of the trailer is directly converted into effective initial work of a compression system, and the fatal energy fault of first pressure relief and then low-pressure full-pressure-difference compression in a traditional scheme is avoided; potential energy wasted by the pressure reducing valve originally is directly inherited and utilized by the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen compression, and in particular to a hydrogen variable-stage compression reciprocating piston compressor unit. Background Art

[0002] As the main power equipment of hydrogen compressors, reciprocating piston compressors can be used in storage, transportation, and refueling. In the transportation of hydrogen tube bundle trailers, after the tube bundle trailer arrives at the hydrogen refueling station, the high-pressure gas in the tube bundle trailer needs to be transferred to the hydrogen storage cylinder group at the hydrogen refueling station. Reciprocating piston compressors can be used to achieve this function during the hydrogen loading and unloading process. When the compressor unit faces large fluctuations in inlet pressure, the process gas is compressed to the required pressure by installing a pressure reducing device (such as a pressure reducing valve) at the process gas inlet. The process gas is then compressed in multiple stages by the compressor to raise the process gas to the required pressure. The hydrogen bundle trailer is then unloaded (the 20 MPa (G) gas in the trailer is unloaded into the storage tank at the hydrogen refueling station). Traditional technical solutions are generally divided into the following two situations: Case 1: When the hydrogen pressure in the tube bundle trailer is higher than the pressure of the hydrogen storage cylinder group (usually the pressure in the tube bundle trailer is around 14MPa(G) to 20MPa(G): direct charging can be used, which is implemented by the AP control module. In this case, the compressor is not started, and hydrogen directly enters the hydrogen storage cylinder group from the tube bundle trailer. The pressure potential energy of the high-pressure hydrogen is fully utilized, achieving energy saving benefits; Case 2: When the hydrogen pressure in the tube bundle trailer is lower than the pressure of the hydrogen storage bottle group (usually when the tube bundle trailer pressure is around 14MPa(G)): At this time, when the pressure in the tube bundle trailer is close to the pressure in the hydrogen storage bottle group, the direct charging efficiency is reduced due to the small pressure difference, and the direct charging mode is switched to the compressor compression mode. A pressure reducing valve is set at the trailer outlet to reduce the pressure to the set low pressure value, usually around 1MPa(G). The compressor is started, and the low-pressure gas after decompression is compressed through multiple stages and then pressurized and delivered to the high-pressure hydrogen storage bottle group at the hydrogen compression station. In the second case, when the hydrogen pressure in the tube bundle trailer is lower than the pressure of the hydrogen storage bottle group, the compressor unit usually adopts the method of first reducing pressure and then compressing. The hydrogen is reduced in pressure through the pressure reducing valve and then compressed in multiple stages to increase it to the required high pressure. The essence of this decompression process is irreversible throttling expansion. The pressure potential energy of the high-pressure gas is not effectively captured and utilized, but is irreversibly converted into useless heat energy and dissipated. Subsequently, the compressor unit needs to consume a large amount of external energy to re-compress the gas that has been reduced to low pressure to the target high pressure step by step. This "first pressure relief and then pressure increase" mode forms a double energy loss. It not only actively discards the high-pressure potential energy that could have been utilized, but also invests the high energy consumption required for full pressure difference compression. That is, the fixed compression ratio structure of the traditional compressor is difficult to dynamically respond to the continuously decreasing trailer pressure, and the compressor unit lacks a transition working mode between the high-pressure section and the low-pressure section. Summary of the Invention

[0003] The object of the present invention is to provide a hydrogen variable-stage compression reciprocating piston compressor unit. When the pressure of the hydrogen in the tube bundle trailer is lower than the pressure of the hydrogen storage bottle group, the control box controls the variable-stage air guide pipe group to operate, so as to control the opening and closing of the pneumatic valves at each stage in the variable-stage air guide pipe, and automatically selects the first-stage compression, the second-stage compression or the third-stage compression according to the inlet pressure of the compressor unit. At this time, the hydrogen enters the first-stage, the second-stage and the third-stage reciprocating piston compressors under the control of the variable-stage air guide pipe group, and the compressed hydrogen enters the hydrogen storage bottle group, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solutions: a hydrogen variable-stage compression reciprocating piston compressor unit, comprising a frame, a first-stage reciprocating piston compressor, a second-stage reciprocating piston compressor, a third-stage reciprocating piston compressor installed along the Y-axis direction at the bottom of the frame, and a variable-stage air guide pipe group installed on the air inlet end of the cylinder of the first-stage reciprocating piston compressor, a second-stage air inlet pipe installed between the air storage tank outlet end of the first-stage reciprocating piston compressor and the air inlet end of the cylinder of the second-stage reciprocating piston compressor, a first-stage air inlet pipe installed between the air storage tank outlet end of the second-stage reciprocating piston compressor and the air inlet end of the cylinder of the third-stage reciprocating piston compressor, and the second-stage air inlet pipe and the first-stage air inlet pipe are both connected to the variable-stage air guide pipe group Maintaining connectivity, at least three gear-type axial-flow blower assemblies are installed inside the frame and are opposite to the compressor air tank. A chain drive assembly is installed inside the frame for driving multiple gear-type axial-flow blower assemblies to work synchronously. A driven impeller radial blower assembly is also installed at the bottom of the frame for power connection with one of the gear-type axial-flow blower assemblies. The driven impeller radial blower assembly is used to form an air curtain below the compressor air tank. A control box is installed on one side of the back side of the frame, and the output end of the control box is electrically connected to the first-stage reciprocating piston compressor, the second-stage reciprocating piston compressor, the third-stage reciprocating piston compressor, the variable-stage air guide pipe group and the input end of the chain drive assembly respectively.

[0005] Preferably, a digital pressure gauge is installed on the top of the air storage tank of the one-stage reciprocating piston compressor, the two-stage reciprocating piston compressor, and the three-stage reciprocating piston compressor, and the output end of the digital pressure gauge is electrically connected to the input end of the control box.

[0006] Preferably, the air storage tank exhaust ports of the one-stage reciprocating piston compressor, the two-stage reciprocating piston compressor, and the three-stage reciprocating piston compressor are all equipped with a first switch valve, and the cylinder air inlet ports of the one-stage reciprocating piston compressor, the two-stage reciprocating piston compressor, and the three-stage reciprocating piston compressor are all equipped with a second switch valve, and the first switch valve and the second switch valve are used to control the opening and closing of the one-stage air intake pipe and the two-stage air intake pipe.

[0007] Preferably, the variable-stage air guide pipe group includes an intake valve installed on the intake end of the first-stage reciprocating piston compressor, a cross-shaped four-way pipe installed at one end of the intake valve away from the first-stage reciprocating piston compressor, and a three-stage control valve installed through a pipeline at the left end inlet of the cross-shaped four-way pipe, and an exhaust valve is installed at the lower end outlet of the cross-shaped four-way pipe.

[0008] Preferably, an F-type diverter pipe is installed at the upper end outlet of the cross-shaped four-way pipe, and a primary control valve and a secondary control valve are installed at the two end bifurcations of the F-type diverter pipe away from the intake valve respectively. A connecting pipe 1 is installed at one end of the primary control valve away from the F-type diverter pipe, which is interconnected with the primary intake pipe. A connecting pipe 2 is installed at one end of the secondary control valve away from the primary intake pipe, which is interconnected with the secondary intake pipe.

[0009] Preferably, the chain drive assembly includes a reduction motor installed on the back side of the frame and a sprocket constant speed transmission structure installed on the end of the reduction motor drive shaft for driving each gear-type axial flow blower assembly to work synchronously, and the input end of the reduction motor is electrically connected to the output end of the control box.

[0010] Preferably, the gear-type axial-flow blower assembly consists of an inclined steel frame fixed inside the frame, a main shaft cylinder and a secondary shaft cylinder fixed on the outer wall of one side of the inclined steel frame, and a small gear shaft and a large gear shaft rotatably installed inside the main shaft cylinder and the secondary shaft cylinder. The small gear shaft and the large gear shaft are meshed with each other. One end of the large gear shaft passes through the outside of the secondary shaft cylinder and is installed with fan blades. The end of the pinion shaft away from the fan blades maintains power connection with the other gear-type axial-flow blower assemblies through a sprocket constant-speed transmission structure. The drive shaft end of the reduction motor and the small gear shaft in one of the gear-type axial-flow blower assemblies are fixedly connected by a coupling.

[0011] Preferably, a cylindrical wind cover is fixed on the outer wall of the secondary shaft cylinder on the side close to the fan blades, and the cylindrical wind cover, the large gear shaft and the air storage tank of the compressor are coaxial.

[0012] Preferably, the driven impeller radial blowing assembly includes a pillow block fixed on the outer wall of one side of the inclined steel frame, a first-stage gear shaft, a second-stage gear shaft and a double-disc gear shaft rotatably installed inside the pillow block, a multi-V belt transmission structure is installed between the first-stage gear shaft and the pinion shaft, and the first-stage gear shaft and the second-stage gear shaft are both meshed with the double-disc gear shaft, and the driven impeller radial blowing assembly also includes an air supply shell installed at the bottom of the frame, an impeller unit rotatably installed inside the air supply shell, and a driven bevel gear shaft rotatably installed on the outer wall of one side of the air supply shell, one end of the driven bevel gear shaft extends to the interior of the air supply shell and is fixedly connected to one end of the impeller unit.

[0013] Preferably, a driving bevel gear shaft is rotatably installed on the other side of the pillow block, the driving bevel gear shaft and the driven bevel gear shaft are meshed with each other, and a second multi-V belt transmission structure is installed between the driving bevel gear shaft and the secondary gear shaft.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the hydrogen variable-stage compression reciprocating piston compressor unit is provided with a first-stage reciprocating piston compressor, a second-stage reciprocating piston compressor, a third-stage reciprocating piston compressor, a variable-stage air guide pipe group, a control box, and a plurality of gear-type axial-flow blower assemblies, a chain-type drive assembly, a driven impeller radial blower assembly and other structures that cooperate with each other. When the pressure of the hydrogen in the tube bundle trailer is lower than the pressure of the hydrogen storage bottle group, the control box controls the variable-stage air guide pipe group to operate, so as to control the valves at each stage in the variable-stage air guide pipe to open and close, and automatically selects the first-stage compression, the second-stage compression and the third-stage compression according to the inlet pressure of the compressor unit. In this case, hydrogen enters the first, second, and third reciprocating piston compressors under the control of the variable-stage air guide assembly. The compressed hydrogen enters the hydrogen storage bottle assembly, fully utilizing the pressure potential energy of the high-pressure hydrogen in the tube bundle trailer. The dynamic scheduling of the valves in the variable-stage air guide assembly allows high-pressure hydrogen (even if it is lower than the storage bottle pressure) to directly enter the medium and high-pressure stages of the compressor assembly, thereby directly converting the trailer's remaining high-pressure potential energy into effective initial work for the compression system. This avoids the fatal energy gap of "first pressure relief and then low-pressure full pressure differential compression" in the traditional solution, and allows the potential energy originally wasted by the pressure reducing valve to be directly inherited and utilized by the compressor. Secondly, the control box seamlessly switches between single-stage, two-stage, or three-stage compression modes. Within a wide range of trailer pressures, from near the lower limit of the tank pressure to significantly above the base intake pressure, the unit automatically matches the optimal number of compression stages. For example, the high-pressure section uses a small number of compression stages, the medium-pressure section uses intermediate compression, and the low-pressure section uses full-stage compression. Its dynamic cascade compression strategy ensures that the compressor unit always operates within the minimum theoretical compression power consumption range, completely eliminating the efficiency cliff of traditional solutions under non-direct charging conditions. Finally, the pressurized hydrogen in the tube bundle trailer does not need to go through the destructive path of decompression and re-pressurization. Its potential energy is directly converted into the pressure increase of the storage bottle group through the low, medium and high pressure stages of the compressor unit, eliminating the entropy increase loss of throttling and decompression. The compression process only does work on the actual pressure gap, opening up a continuous energy efficiency spectrum of "high pressure difference direct charging", "medium pressure difference partial compression" and "low pressure difference full compression", greatly expanding the pressure application range of efficient unloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the three-dimensional structure of the present invention Figure 1 ; Figure 2 Schematic diagram of the three-dimensional structure of the present invention Figure 2 ; Figure 3Schematic diagram of the three-dimensional structure of the present invention Figure 3 ; Figure 4 Schematic diagram of the three-dimensional structure of the present invention Figure 4 ; Figure 5 This is a schematic diagram of the upper and lower isometric three-dimensional structure of the present invention; Figure 6 Schematic diagram of the three-dimensional structure of the variable-speed air guide tube assembly according to the second embodiment of the present invention Figure 1 ; Figure 7 Schematic diagram of the three-dimensional structure of the variable-speed air guide tube assembly according to the second embodiment of the present invention Figure 2 ; Figure 8 This is a schematic diagram of the three-dimensional structure of the chain drive assembly according to the third embodiment of the present invention; Figure 9 Schematic diagram of the three-dimensional structure of the gear-type axial flow blower assembly according to the third embodiment of the present invention Figure 1 ; Figure 10 Schematic diagram of the three-dimensional structure of the gear-type axial flow blower assembly according to the third embodiment of the present invention Figure 2 ; Figure 11 This is a schematic diagram of the three-dimensional structure of the inclined steel frame according to the third embodiment of the present invention; Figure 12 Schematic diagram of the three-dimensional structure of the driven impeller radial blast assembly of the fourth embodiment of the present invention Figure 1 ; Figure 13 Schematic diagram of the three-dimensional structure of the driven impeller radial blast assembly of the fourth embodiment of the present invention Figure 2 .

[0016] In the figure: 1. Frame; 2. One-stage reciprocating piston compressor; 3. Two-stage reciprocating piston compressor; 4. Three-stage reciprocating piston compressor; 5. One-stage intake pipe; 6. Two-stage intake pipe; 7. Variable-stage air guide pipe assembly; 701. Cross-shaped cross-tube; 702. Exhaust valve; 703. Intake valve; 704. Three-stage control valve; 705. F-type manifold; 706. One-stage control valve; 707. Connecting pipe 1; 708. Two-stage control valve; 709. Connecting pipe 2; 8. Control box; 9. Gear-type axial-flow blower assembly; 901. Inclined steel frame; 902. Main shaft cylinder; 903. Pinion Shaft; 904, countershaft cylinder; 905, large gear shaft; 906, cylindrical wind hood; 907, fan blades; 10, chain drive assembly; 1001, reduction motor; 1002, sprocket constant speed transmission structure; 11, driven impeller radial blast assembly; 1101, air supply shell; 1102, impeller monomer; 1103, driven bevel gear shaft; 1104, driving bevel gear shaft; 1105, pillow block; 1106, first-stage gear shaft; 1107, double-disc gear shaft; 1108, second-stage gear shaft; 1109, multi-V belt transmission structure one; 1110, multi-V belt transmission structure two. DETAILED DESCRIPTION

[0017] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] Embodiment 1, by Figures 1 to 5The present invention includes a frame 1, a first-stage reciprocating piston compressor 2, a second-stage reciprocating piston compressor 3, a third-stage reciprocating piston compressor 4 installed along the Y-axis at the bottom of the frame 1, and a variable-stage air guide pipe group 7 installed on the air inlet end of the cylinder of the first-stage reciprocating piston compressor 2. A second-stage air inlet pipe 6 is installed between the air outlet end of the air storage tank of the first-stage reciprocating piston compressor 2 and the air inlet end of the cylinder of the second-stage reciprocating piston compressor 3. A first-stage air inlet pipe 5 is installed between the air outlet end of the air storage tank of the second-stage reciprocating piston compressor 3 and the air inlet end of the cylinder of the third-stage reciprocating piston compressor 4. The second-stage air inlet pipe 6 and the first-stage air inlet pipe 5 are both connected to the variable-stage air guide pipe group 7. At least three A gear-type axial-flow blower assembly 9 is mounted on the interior of the frame 1 and is opposite to the compressor air storage tank. A chain drive assembly 10 is installed inside the frame 1 for driving the multiple gear-type axial-flow blower assemblies 9 to work synchronously. A driven impeller radial blower assembly 11 is also installed at the bottom of the frame 1 and is powered by one of the gear-type axial-flow blower assemblies 9. The driven impeller radial blower assembly 11 is used to form an air curtain below the compressor air storage tank. A control box 8 is mounted on one side of the back of the frame 1. The output end of the control box 8 is electrically connected to the first-stage reciprocating piston compressor 2, the second-stage reciprocating piston compressor 3, the third-stage reciprocating piston compressor 4, the variable-stage air guide pipe group 7, and the input end of the chain drive assembly 10 respectively; A digital pressure gauge is installed on the top of the air storage tank of the first-stage reciprocating piston compressor 2, the second-stage reciprocating piston compressor 3, and the third-stage reciprocating piston compressor 4. The output end of the digital pressure gauge is electrically connected to the input end of the control box 8. The exhaust port of the air storage tank of the first-stage reciprocating piston compressor 2, the second-stage reciprocating piston compressor 3, and the third-stage reciprocating piston compressor 4 is installed with a first switch valve, and the cylinder air inlet of the first-stage reciprocating piston compressor 2, the second-stage reciprocating piston compressor 3, and the third-stage reciprocating piston compressor 4 is installed with a second switch valve. The first switch valve and the second switch valve are used to control the opening and closing of the first-stage air intake pipe 5 and the second-stage air intake pipe 6; When the hydrogen pressure in the tube bundle trailer is higher than the pressure of the hydrogen storage bottle group, which is usually around 14MPa(G) to 20MPa(G), a direct charging method can be adopted, which is controlled by the control box 8. At this time, all compressions are not started, and hydrogen directly enters the hydrogen storage bottle group from the tube bundle trailer through the exhaust end of the variable-stage air guide pipe group 7. The pressure potential energy of the high-pressure hydrogen is fully utilized, achieving energy-saving benefits; When the process gas inlet pressure range is wider, more compressors can be used for variable-stage compression. When the process gas inlet pressure range is narrower, fewer compressors can be used for variable-stage compression, not limited to the first-stage reciprocating piston compressor 2, the second-stage reciprocating piston compressor 3, and the third-stage reciprocating piston compressor 4. In this case, the number of valves connected to the compressors in the variable-stage air guide pipe group 7 also needs to be increased or decreased accordingly. For example, it can be four-stage compression, which becomes three-stage compression, which becomes two-stage compression, which becomes one-stage compression, and the compression stage change is reversible; it can also be five-stage compression, which becomes four-stage compression, which becomes three-stage compression, which becomes two-stage compression, which becomes one-stage compression, and the compression stage change is reversible; it can also be six-stage compression, which becomes five-stage compression, which becomes four-stage compression, which becomes three-stage compression, which becomes two-stage compression, which becomes one-stage compression, and the compression stage change is reversible; at the same time, the compressed process gas in the scheme can be a single gas or a mixed gas of any component, not just limited to hydrogen.

[0019] Example 2, based on Example 1, Figure 6 and Figure 7 The variable-stage air guide pipe group 7 includes an intake valve 703 installed on the intake end of the first-stage reciprocating piston compressor 2, a cross-shaped pipe 701 installed at the end of the intake valve 703 away from the first-stage reciprocating piston compressor 2, and a three-stage control valve 704 installed through a pipe at the left inlet of the cross-shaped pipe 701. The exhaust valve 702 is installed at the lower outlet of the cross-shaped pipe 701, and the F-type diverter pipe 705 is installed at the upper outlet of the cross-shaped pipe 701. The two ends of the F-type diverter pipe 705 away from the intake valve 703 are respectively equipped with a first-stage control valve 706 and a second-stage control valve 708. The three-stage control valve 704, the intake valve 703, the first-stage control valve 706, and the second-stage control valve 708 can all be solenoid valves. In this case, the input end of each solenoid valve is electrically connected to the output end of the control box 8. The end of the primary control valve 706 away from the F-type diverter pipe 705 is equipped with a connecting pipe 1 707 that is interconnected with the primary air intake pipe 5. The end of the secondary control valve 708 away from the primary air intake pipe 5 is equipped with a connecting pipe 2 709 that is interconnected with the secondary air intake pipe 6. If the hydrogen in the tube bundle trailer is in a low-pressure state and requires full-stage compression, the staff closes the exhaust valve 702, the secondary control valve 708, and the primary control valve 706, and opens the intake valve 703. At this time, the hydrogen enters the primary reciprocating piston compressor 2 from the intake valve 703. The hydrogen compressed by the primary reciprocating piston compressor 2 enters the secondary reciprocating piston compressor 3 through the gas storage tank, the gas storage tank switch valve, and the secondary intake pipe 6. After being compressed again by the secondary reciprocating piston compressor 3, the hydrogen enters the tertiary reciprocating piston compressor 4 through the primary intake pipe 5. The hydrogen is compressed again by the tertiary reciprocating piston compressor 4 and finally sent to the hydrogen storage bottle group. The hydrogen in the tube bundle trailer enters the cross-shaped pipe 701 through the three-stage control valve 704. If the hydrogen pressure in the tube bundle trailer is higher than the pressure of the hydrogen storage cylinder group, the first-stage control valve 706, the second-stage control valve 708, and the air inlet valve 703 are all in the normally closed state under the control of the control box 8. Then, this part of the hydrogen rushes directly into the hydrogen storage cylinder group through the exhaust valve 702. A controllable airflow channel is formed by multiple groups of valves. After the control box 8 analyzes the optimal compression path according to the real-time intake pressure and the pressure in the hydrogen storage bottle group, it selectively opens a specific valve combination. When hydrogen enters, the variable-stage air duct group can skip the low-pressure compressor section, such as directly cutting into the second or third stage, so that the gas inherits the original pressure potential energy as the starting point of compression. The high-pressure gas only needs to undergo compression in the insufficient pressure section, avoiding the energy fault in the traditional solution of "high-pressure gas being reduced to low pressure and then compressed by the full pressure difference".

[0020] Example 3, based on Example 2, Figure 8 、 Figure 9 、 Figure 10 and Figure 11 It is given that the chain drive assembly 10 includes a reduction motor 1001 installed on one side of the back of the frame 1 and a sprocket constant speed transmission structure 1002 installed on the end of the driving shaft of the reduction motor 1001 for driving each gear-type axial flow blower assembly 9 to work synchronously. The input end of the reduction motor 1001 is electrically connected to the output end of the control box 8. When cooling the compressor air tank, the reduction motor 1001 is turned on by the control box 8 to work, and the reduction motor 1001 transmits rotational power to the three gear-type axial flow blower assemblies 9 through the sprocket constant speed transmission structure 1002, and then the multiple gear-type axial flow blower assemblies 9 work synchronously; The gear-type axial flow blower assembly 9 is composed of an inclined steel frame 901 fixed to the inside of the frame 1, a main shaft cylinder 902 and a secondary shaft cylinder 904 fixed on the outer wall of one side of the inclined steel frame 901, and a small gear shaft 903 and a large gear shaft 905 rotatably installed inside the main shaft cylinder 902 and the secondary shaft cylinder 904. The small gear shaft 903 and the large gear shaft 905 are meshed with each other. One end of the large gear shaft 905 passes through the outside of the secondary shaft cylinder 904 and is equipped with a fan blade 907. The small gear shaft 903 The end away from the fan blades 907 maintains power connection with the other gear-type axial flow blower assemblies 9 through a sprocket constant speed transmission structure 1002. The drive shaft end of the reduction motor 1001 is fixedly connected to the small gear shaft 903 in one of the gear-type axial flow blower assemblies 9 through a coupling. A cylindrical wind cover 906 is fixed to the outer wall of the side of the secondary shaft cylinder 904 close to the fan blades 907. The cylindrical wind cover 906 and the large gear shaft 905 are coaxial with the air storage tank of the compressor. The small gear shaft 903 in the gear-type axial flow blower assembly 9 receives the rotational power of the reduction motor 1001 through the sprocket constant speed transmission structure 1002, and then the small gear shaft 903 drives the fan blades 907 to rotate through the large gear shaft 905, so that the fan blades 907 generate axial airflow. This part of the axial airflow is guided by the cylindrical wind cover 906 and continuously blows toward the air tank of the compressor. By fully covering the surface of the compressor air tank for forced convection heat dissipation, the compression heat is quickly discharged.

[0021] Example 4, based on Example 3, Figure 12and Figure 13 It is given that the driven impeller radial blast assembly 11 includes a pillow block 1105 fixed on the outer wall of one side of the inclined steel frame 901, a first-stage gear shaft 1106, a second-stage gear shaft 1108 and a double-disk gear shaft 1107 rotatably installed inside the pillow block 1105, a multi-V belt transmission structure 1109 is installed between the first-stage gear shaft 1106 and the pinion shaft 903, and the first-stage gear shaft 1106 and the second-stage gear shaft 1108 are both engaged with the double-disk gear shaft 1107, and the driven impeller radial blast assembly 11 also includes an air supply shell 1101 installed at the bottom of the frame 1, an impeller monomer 1102 rotatably installed inside the air supply shell 1101, and a driven bevel gear shaft 1103 rotatably installed on the outer wall of one side of the air supply shell 1101, one end of the driven bevel gear shaft 1103 extends to the interior of the air supply shell 1101 and is fixedly connected to one end of the impeller monomer 1102; The other side of the pillow block 1105 is rotatably mounted with a driving bevel gear shaft 1104. The driving bevel gear shaft 1104 and the driven bevel gear shaft 1103 are meshed with each other. A multi-V belt transmission structure 1110 is installed between the driving bevel gear shaft 1104 and the secondary gear shaft 1108. The pinion shaft 903 in one of the gear-type axial flow blower assemblies 9 drives the primary gear shaft 1106 to rotate through the multi-V belt transmission structure 1109. The primary gear shaft 1106 is meshed with one of the toothed discs of the double-disc gear shaft 1107, and then The other gear disc of the double-disc gear shaft 1107 transmits rotational power to the secondary gear shaft 1108, so that the secondary gear shaft 1108 drives the shaft block 1105 to rotate through the multi-V belt transmission structure 1110, and finally the shaft block 1105 drives the impeller unit 1102 in the air supply casing 1101 to rotate through the driven bevel gear shaft 1103. At this time, the impeller unit 1102 generates radial airflow and forms an air curtain under the three compressor air tanks to quickly discharge heat and ensure that the working environment of the compressor is always within an appropriate range.

[0022] When the embodiment of the present application is in use, if the hydrogen pressure in the tube bundle trailer is lower than the pressure of the hydrogen storage bottle group, usually the pressure of the tube bundle trailer is about <14MPa (G), the staff will complete the physical connection between the gas unloading port of the hydrogen tube bundle trailer and the air inlet end of the variable-stage air guide pipe group 7, and the exhaust end of the three-stage reciprocating piston compressor 4 is connected to the air inlet end of the hydrogen storage bottle group of the hydrogen filling station to confirm that the sealing meets the standard; the staff will control the valves of each stage in the variable-stage air guide pipe group 7 to reset to the initial closed state through the control box 8, and activate the chain drive assembly 10 to work, and the chain drive assembly 10 will drive the three gear-type axial flow blower assemblies 9 to the gas storage of the first-stage reciprocating piston compressor 2, the second-stage reciprocating piston compressor 3, and the third-stage reciprocating piston compressor 4. The tank is ventilated by blowing air to cool it down. At the same time, the driven impeller radial blast assembly 11 also receives the rotational power from the chain drive assembly 10 to form a continuous air curtain again under the gas storage tanks of the first-stage reciprocating piston compressor 2, the second-stage reciprocating piston compressor 3, and the third-stage reciprocating piston compressor 4; the control box 8 monitors and receives the outlet pressure of the hydrogen pipe bundle trailer and the pressure of the hydrogen storage bottle group in real time. When the pressure of the hydrogen pipe bundle trailer is lower than the pressure of the hydrogen storage bottle group, if the residual pressure is still significantly higher than the basic intake pressure of the compressor, the compressor group switches from the direct charging mode to the compressor compression mode. During this process, the control box 8 calculates the optimal compression path based on the real-time pressure difference, automatically selects the first-stage, second-stage or third-stage compression mode, and the variable-stage air guide pipe group 7 A specific valve combination is dynamically opened according to the instruction of the control box 8. For example, when a medium- and high-pressure difference is detected, the first-stage reciprocating piston compressor 2, the second-stage reciprocating piston compressor 3, and the third-stage reciprocating piston compressor 4 are directly opened to work; hydrogen enters the preset compression stage under the precise guidance of the variable-stage air guide pipe group 7: for medium- and high-pressure hydrogen, it is directly injected into the second-stage reciprocating piston compressor 3 through the second-stage air inlet pipe 6 and the variable-stage air guide pipe group 7. The second-stage reciprocating piston compressor 3 serves as the starting compression stage. When the piston moves upward, it inherits the pressure potential energy as the initial compression work, and only applies the necessary pressure boost to the gas to the target pressure. If the low-pressure hydrogen needs three-stage compression, the hydrogen is directly sent to the first-stage reciprocating piston compressor 2 through the variable-stage air guide pipe group 7. Compressor 2 is the starting compression stage, and after being compressed by the second-stage reciprocating piston compressor 3 and the third-stage reciprocating piston compressor 4, it is sent to the hydrogen storage bottle group of the hydrogen filling station. During the compression process, each gear-type axial flow blower assembly 9 forces heat dissipation to the high-temperature gas storage tank of the compressor, and the driven impeller radial blower assembly 11 enhances interstage cooling, further suppressing the rise in hydrogen temperature; as the trailer pressure continues to drop, the control box 8 periodically rechecks the pressure difference. When the pressure difference is reduced to the next threshold, such as from a medium-high pressure difference to a medium-low pressure difference, the variable-stage air guide pipe group 7 and the corresponding first-stage reciprocating piston compressor 2, the second-stage reciprocating piston compressor 3, and the third-stage reciprocating piston compressor 4 are automatically controlled to switch the compression stages, and the hydrogen is transferred to the lower compression stage for relay pressurization;The compressed high-pressure hydrogen is directly transported to the hydrogen storage cylinder group through the exhaust port of the final three-stage reciprocating piston compressor 4. When the trailer pressure and the hydrogen storage cylinder pressure are balanced, the control box 8 closes all valves, and the shutdown command triggers the chain drive assembly 10 to delay operation until the compressor gas tank cools. The staff disconnects the pipeline between the compressor group and the hydrogen pipe bundle trailer, and all valves of the variable-stage air guide pipe group 7 are reset and put into standby mode.

[0023] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0024] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A hydrogen variable-stage compression reciprocating piston compressor unit, characterized in that: The invention comprises a frame (1), a first-stage reciprocating piston compressor (2), a second-stage reciprocating piston compressor (3), a third-stage reciprocating piston compressor (4) installed along the Y-axis at the bottom of the frame (1), and a variable-stage air guide pipe group (7) installed on the air inlet end of the cylinder of the first-stage reciprocating piston compressor (2), a second-stage air inlet pipe (6) installed between the air storage tank outlet end of the first-stage reciprocating piston compressor (2) and the air inlet end of the cylinder of the second-stage reciprocating piston compressor (3), a first-stage air inlet pipe (5) installed between the air storage tank outlet end of the second-stage reciprocating piston compressor (3) and the air inlet end of the cylinder of the third-stage reciprocating piston compressor (4), the second-stage air inlet pipe (6) and the first-stage air inlet pipe (5) are both connected to the variable-stage air guide pipe group (7), and at least three A gear-type axial-flow blower assembly (9) is provided opposite to the compressor air storage tank. A chain drive assembly (10) for driving the plurality of gear-type axial-flow blower assemblies (9) to work synchronously is installed inside the frame (1). A driven impeller radial blower assembly (11) for power connection with one of the gear-type axial-flow blower assemblies (9) is also installed at the bottom of the frame (1). The driven impeller radial blower assembly (11) is used to form an air curtain below the compressor air storage tank. A control box (8) is installed on one side of the back of the frame (1). The output end of the control box (8) is electrically connected to the input end of the first-stage reciprocating piston compressor (2), the second-stage reciprocating piston compressor (3), the third-stage reciprocating piston compressor (4), the variable-stage air guide pipe group (7) and the chain drive assembly (10).

2. The hydrogen variable-stage compression reciprocating piston compressor unit according to claim 1, characterized in that: The tops of the gas storage tanks of the first-stage reciprocating piston compressor (2), the second-stage reciprocating piston compressor (3), and the third-stage reciprocating piston compressor (4) are all equipped with digital pressure gauges, and the output ends of the digital pressure gauges are electrically connected to the input ends of the control box (8).

3. The hydrogen variable-stage compression reciprocating piston compressor unit according to claim 2, characterized in that: The air storage tank exhaust ports of the first-stage reciprocating piston compressor (2), the second-stage reciprocating piston compressor (3), and the third-stage reciprocating piston compressor (4) are all equipped with a first switch valve, and the cylinder air inlet ports of the first-stage reciprocating piston compressor (2), the second-stage reciprocating piston compressor (3), and the third-stage reciprocating piston compressor (4) are all equipped with a second switch valve, and the first-stage air inlet pipe (5) and the second-stage air inlet pipe (6) are controlled to be on and off by the first switch valve and the second switch valve.

4. The hydrogen variable-stage compression reciprocating piston compressor unit according to claim 2, characterized in that: The variable-stage air guide pipe group (7) comprises an intake valve (703) installed on the intake end of the first-stage reciprocating piston compressor (2), a cross-shaped four-way pipe (701) installed at one end of the intake valve (703) away from the first-stage reciprocating piston compressor (2), and a three-stage control valve (704) installed at the left end inlet of the cross-shaped four-way pipe (701) through a pipeline. The lower end outlet of the cross-shaped four-way pipe (701) is equipped with an exhaust valve (702).

5. The hydrogen variable-stage compression reciprocating piston compressor unit according to claim 4, characterized in that: An F-type diverter pipe (705) is installed at the upper outlet of the cross-shaped four-way pipe (701), and a primary control valve (706) and a secondary control valve (708) are installed at the bifurcated ends of the F-type diverter pipe (705) away from the air intake valve (703), respectively. A connecting pipe 1 (707) communicating with the primary air intake pipe (5) is installed at one end of the primary control valve (706) away from the F-type diverter pipe (705), and a connecting pipe 2 (709) communicating with the secondary air intake pipe (6) is installed at one end of the secondary control valve (708) away from the primary air intake pipe (5).

6. The hydrogen variable-stage compression reciprocating piston compressor unit according to claim 1, characterized in that: The chain drive assembly (10) comprises a reduction motor (1001) mounted on the back side of the frame (1) and a sprocket constant speed transmission structure (1002) mounted on the end of the drive shaft of the reduction motor (1001) for driving each gear-type axial flow blower assembly (9) to work synchronously. The input end of the reduction motor (1001) is electrically connected to the output end of the control box (8).

7. The hydrogen variable-stage compression reciprocating piston compressor unit according to claim 6, characterized in that: The gear-type axial flow blower assembly (9) comprises an inclined steel frame (901) fixed inside the frame (1), a main shaft cylinder (902) fixed on the outer wall of one side of the inclined steel frame (901), a secondary shaft cylinder (904), and a small gear shaft (903) and a large gear shaft (905) rotatably installed inside the main shaft cylinder (902) and the secondary shaft cylinder (904). The small gear shaft (903) and the large gear shaft (905) are meshed with each other. One end of the large gear shaft (905) passes through the outside of the secondary shaft cylinder (904) and is installed with a fan blade (907). The end of the small gear shaft (903) away from the fan blade (907) maintains power connection with the other gear-type axial flow blower assemblies (9) through a sprocket constant speed transmission structure (1002). The driving shaft end of the reduction motor (1001) and the small gear shaft (903) in one of the gear-type axial flow blower assemblies (9) are fixedly connected through a coupling.

8. The hydrogen variable-stage compression reciprocating piston compressor unit according to claim 7, characterized in that: A cylindrical wind hood (906) is fixed on the outer wall of the secondary shaft cylinder (904) on one side close to the fan blade (907), and the cylindrical wind hood (906), the large gear shaft (905) and the air storage tank of the compressor are coaxial.

9. The hydrogen variable-stage compression reciprocating piston compressor unit according to claim 7, characterized in that: The driven impeller radial blast assembly (11) comprises a pillow block (1105) fixed on the outer wall of one side of the inclined steel frame (901), a first-stage gear shaft (1106), a second-stage gear shaft (1108) and a double-disc gear shaft (1107) rotatably mounted inside the pillow block (1105), a multi-V belt transmission structure (1109) being installed between the first-stage gear shaft (1106) and the pinion shaft (903), and the first-stage gear shaft (1106) and the second-stage gear shaft (1108) are both The driven impeller radial air blower assembly (11) is meshed with the double-disc gear shaft (1107), and further comprises an air supply housing (1101) mounted at the bottom of the frame (1), an impeller unit (1102) rotatably mounted inside the air supply housing (1101), and a driven bevel gear shaft (1103) rotatably mounted on an outer wall of one side of the air supply housing (1101), one end of the driven bevel gear shaft (1103) extending into the interior of the air supply housing (1101) and fixedly connected to one end of the impeller unit (1102).

10. The hydrogen variable-stage compression reciprocating piston compressor unit according to claim 9, characterized in that: A driving bevel gear shaft (1104) is rotatably mounted on the other side of the pillow block (1105), the driving bevel gear shaft (1104) and the driven bevel gear shaft (1103) are meshed with each other, and a second multi-V belt transmission structure (1110) is mounted between the driving bevel gear shaft (1104) and the secondary gear shaft (1108).

Images