A hydrogen variable-stage compression reciprocating piston compressor unit

Abstract

The application discloses a hydrogen variable-stage compression reciprocating piston compressor unit and relates to the technical field of hydrogen compression. The hydrogen variable-stage compression reciprocating piston compressor unit comprises a rack, a first-stage reciprocating piston compressor, a second-stage reciprocating piston compressor, a third-stage reciprocating piston compressor and a variable-stage gas guide pipe group installed on a cylinder intake end of the first-stage reciprocating piston compressor. A second-stage gas inlet pipe is installed between a gas tank gas outlet end of the first-stage reciprocating piston compressor and a cylinder intake end of the second-stage reciprocating piston compressor. The valve dynamic scheduling of the variable-stage gas guide pipe group allows high-pressure hydrogen to be directly cut into low, medium and high-pressure stages of the compressor unit, so that the remaining high-pressure potential energy of the trailer is directly converted into effective initial work of the compression system, the fatal energy fault of the traditional scheme, i.e., "first pressure relief and then low-pressure full-pressure differential compression", is avoided, and the potential energy wasted by the pressure relief valve is directly inherited and utilized by the compressor.

Description

TECHNICAL FIELD

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

[0002] The reciprocating piston compressor is the main power equipment of the hydrogen compressor, and can be applied in storage, transportation and filling. In the hydrogen pipe bundle trailer transportation link, the high-pressure gas in the pipe bundle trailer needs to be transferred to the hydrogen storage bottle group in the hydrogen filling station after the pipe bundle trailer arrives at the hydrogen filling station. The reciprocating piston compressor can be used to realize this function in the loading and unloading process of hydrogen.

[0003] When the compressor unit faces a large fluctuation in the inlet pressure, the process gas is compressed to the required pressure. The usual method is to install a pressure reducing device (pressure reducing valve, etc.) at the process gas inlet, and then the process gas is compressed by the compressor to the required pressure. The traditional technical solution for the hydrogen pipe bundle trailer unloading (the gas in the trailer is unloaded to the storage bottle in the hydrogen filling station) is generally divided into the following two cases:

[0004] Case 1: When the hydrogen pressure in the pipe bundle trailer is higher than the pressure of the hydrogen storage bottle group (usually the pressure in the pipe bundle trailer is about 14MPa(G) to 20MPa(G)): The direct charging mode can be used, and the AP control module is used. At this time, the compressor is not started, and the hydrogen is directly transferred from the pipe bundle trailer to the hydrogen storage bottle group. The pressure potential energy of the high-pressure hydrogen is fully utilized to achieve energy saving benefits.

[0005] Case 2: When the hydrogen pressure in the pipe bundle trailer is lower than the pressure of the hydrogen storage bottle group (usually the pressure in the pipe bundle trailer is less than about 14MPa(G)): When the pressure in the pipe 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. At this time, the direct charging mode is switched to the compressor compression mode. The pressure reducing valve is arranged at the outlet of the trailer to reduce the pressure to a set low pressure value, which is usually about 1MPa(G). The compressor is started, and the low-pressure gas after pressure reduction is compressed by multiple stages and delivered to the high-pressure hydrogen storage bottle group in the hydrogen filling station.

[0006] In the second case, when the hydrogen pressure in the tube bundle trailer is lower than the hydrogen cylinder group pressure, the compressor group usually adopts the mode of decompression and compression, that is, hydrogen is decompressed by a decompression valve and then compressed by multiple stages to reach the required high pressure. The decompression process is essentially irreversible throttling expansion, and the pressure potential energy of the high-pressure gas is not effectively captured and utilized, but is irreversibly converted into useless heat energy dissipation. Subsequently, the compressor group 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. This "decompression and pressurization" mode forms double energy loss, that is, the high-pressure potential energy that can be utilized is actively discarded, and the high energy consumption required for full pressure differential compression is additionally invested. 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 group lacks a transition working mode between the high-pressure stage and the low-pressure stage. SUMMARY

[0007] The purpose of the present application is to provide a hydrogen variable-stage compression reciprocating piston compressor unit. When the hydrogen pressure in the tube bundle trailer is lower than the hydrogen cylinder group pressure, the control box controls the variable-stage gas guide pipe group to act, controls the opening and closing of each stage of the gas valve in the variable-stage gas guide pipe group, and automatically selects one-stage compression, two-stage compression or three-stage compression according to the inlet pressure of the compressor unit. At this time, hydrogen enters the one-stage, two-stage and three-stage reciprocating piston compressors under the control of the variable-stage gas guide pipe group, and the compressed hydrogen enters the hydrogen cylinder group, thereby solving the problems raised in the background art.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a hydrogen variable-stage compression reciprocating piston compressor unit, comprising a rack, a one-stage reciprocating piston compressor, a two-stage reciprocating piston compressor and a three-stage reciprocating piston compressor installed along the Y-axis direction on the bottom of the rack, and a variable-stage gas guide pipe group installed on the inlet end of the cylinder body of the one-stage reciprocating piston compressor, a two-stage gas inlet pipe installed between the gas tank outlet end of the one-stage reciprocating piston compressor and the cylinder body inlet end of the two-stage reciprocating piston compressor, and a one-stage gas inlet pipe installed between the gas tank outlet end of the two-stage reciprocating piston compressor and the cylinder body inlet end of the three-stage reciprocating piston compressor, wherein the two-stage gas inlet pipe and the one-stage gas inlet pipe are in communication with the variable-stage gas guide pipe group, at least three gear-type axial flow blower assemblies opposite to the compressor gas tank are installed in the interior of the rack, a chain-type driving assembly for driving the multiple gear-type axial flow blower assemblies to work synchronously is installed in the interior of the rack, a driven-type impeller radial blower assembly for power connection with one of the gear-type axial flow blower assemblies is also installed on the bottom of the rack, and the driven-type impeller radial blower assembly is used to form a wind curtain below the compressor gas tank, a control box is installed on one side of the back of the rack, and the output end of the control box is electrically connected with the input end of the one-stage reciprocating piston compressor, the two-stage reciprocating piston compressor, the three-stage reciprocating piston compressor, the variable-stage gas guide pipe group and the chain-type driving assembly, respectively.

[0009] Preferably, the top of the air tank of the primary reciprocating piston compressor, the secondary reciprocating piston compressor and the tertiary reciprocating piston compressor is provided with a digital pressure gauge, and the output end of the digital pressure gauge is electrically connected with the input end of the control box.

[0010] Preferably, the exhaust port of the air tank of the primary reciprocating piston compressor, the secondary reciprocating piston compressor and the tertiary reciprocating piston compressor is provided with a first on-off valve, and the cylinder gas inlet of the primary reciprocating piston compressor, the secondary reciprocating piston compressor and the tertiary reciprocating piston compressor is provided with a second on-off valve, and the on-off of the primary gas inlet pipe and the secondary gas inlet pipe is controlled by the first on-off valve and the second on-off valve.

[0011] Preferably, the variable-stage gas guide pipe group comprises an air inlet valve installed on the air inlet end of the primary reciprocating piston compressor, a cross four-way pipe installed on the end of the air inlet valve away from the primary reciprocating piston compressor, and a tertiary control valve installed on the left end inlet of the cross four-way pipe through a pipeline, and the lower end outlet of the cross four-way pipe is provided with an exhaust valve.

[0012] Preferably, the upper end outlet of the cross four-way pipe is provided with an F-shaped shunt pipe, and the two bifurcated inlets of the F-shaped shunt pipe away from the air inlet valve are respectively provided with a primary control valve and a secondary control valve, the end of the primary control valve away from the F-shaped shunt pipe is provided with a communication pipe one in communication with the primary gas inlet pipe, and the end of the secondary control valve away from the primary gas inlet pipe is provided with a communication pipe two in communication with the secondary gas inlet pipe.

[0013] Preferably, the chain drive assembly comprises a speed reducer motor installed on one side of the back of the frame and a chain sprocket constant velocity transmission structure for driving each gear type axial flow blower assembly to work synchronously, and the input end of the speed reducer motor is electrically connected with the output end of the control box.

[0014] Preferably, the gear type axial flow blower assembly comprises an inclined steel frame fixed in 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 pinion shaft and a gear shaft rotatably installed in the main shaft cylinder and the secondary shaft cylinder, the pinion shaft and the gear shaft are meshed with each other, one end of the gear shaft penetrates to the outside of the secondary shaft cylinder and is provided with a fan blade, the end of the pinion shaft away from the fan blade is power connected with the remaining gear type axial flow blower assemblies through the chain sprocket constant velocity transmission structure, and the end of the driving shaft of the speed reducer motor and the pinion shaft in one of the gear type axial flow blower assemblies are fixedly connected through a shaft coupling.

[0015] Preferably, the outer wall of the side of the secondary shaft cylinder close to the fan blade is fixed with a cylindrical wind shield, and the cylindrical wind shield and the gear shaft are coaxial with the air tank of the compressor.

[0016] Preferably, the driven impeller radial blower assembly comprises a shaft base fixed on the outer wall of one side of the inclined steel frame, a primary gear shaft, a secondary gear shaft and a double-disc gear shaft rotatably installed inside the shaft base, a multi-belt drive structure one is installed between the primary gear shaft and the secondary gear shaft, the primary gear shaft and the secondary gear shaft are engaged with the double-disc gear shaft, the driven impeller radial blower assembly further comprises a blast shell installed at the bottom of the frame, a single impeller rotatably installed inside the blast shell and a driven bevel gear shaft rotatably installed on the outer wall of one side of the blast shell, one end of the driven bevel gear shaft extends to the inside of the blast shell and is fixedly connected with one end of the single impeller.

[0017] Preferably, the other side of the shaft base is rotatably installed with a driving bevel gear shaft, the driving bevel gear shaft and the driven bevel gear shaft are engaged with each other, and a multi-belt drive structure two is installed between the driving bevel gear shaft and the secondary gear shaft.

[0018] Compared with the prior art, the hydrogen variable-stage compression reciprocating piston compressor set has the following beneficial effects: the structure of the hydrogen variable-stage compression reciprocating piston compressor set is matched with a primary reciprocating piston compressor, a secondary reciprocating piston compressor, a tertiary reciprocating piston compressor, a variable-stage gas guide pipe group, a control box and a plurality of gear type axial flow blower assemblies, chain type driving assemblies and driven impeller radial blower assemblies in series connection with the air inlet and outlet, when the pressure of hydrogen in the tube bundle trailer is lower than the pressure of the hydrogen storage bottle group, the control box controls the variable-stage gas guide pipe group to act, so that the valves in the variable-stage gas guide pipe are opened and closed, and the primary compression, the secondary compression or the tertiary compression is automatically selected according to the inlet pressure of the compressor set, at this time, the hydrogen enters the primary, secondary and tertiary reciprocating piston compressors under the control of the variable-stage gas guide pipe group, the compressed hydrogen enters the hydrogen storage bottle group, and the potential energy of the high-pressure hydrogen in the tube bundle trailer is fully utilized; through the dynamic scheduling of the valves in the variable-stage gas guide pipe group, the high-pressure hydrogen (even lower than the pressure of the hydrogen storage bottle) is directly cut into the medium and high-pressure stages of the compressor set, so that the remaining high-pressure potential energy of the trailer is directly converted into effective initial work of the compression system, the fatal energy fault of the traditional scheme of “first pressure relief and then low-pressure full differential pressure compression” is avoided, and the potential energy wasted by the pressure relief valve is directly inherited and utilized by the compressor;

[0019] Secondly, the control box seamlessly switches the primary, secondary or tertiary compression mode, in a wide range from the lower limit of the pressure of the hydrogen storage bottle to significantly higher than the basic inlet pressure, the compressor set can automatically match the optimal compression stage number, for example, the high-pressure stage matches a few-stage compression, the medium-pressure stage uses medium-stage compression, and the low-pressure stage starts full-stage compression, the dynamic cascade compression strategy makes the compressor set always run in the minimum theoretical compression power consumption interval, and completely eliminates the efficiency cliff of the traditional scheme in the non-direct charging working condition;

[0020] Finally, the hydrogen gas in the tube bundle trailer under pressure does not need to go through the destructive path of decompression-repressurization, and its potential energy is directly converted into the pressure increase of the bottle group through the low, medium and high pressure stages of the compressor set, eliminating the entropy increase loss of throttling decompression. The compression process only works for 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", and greatly expanding the pressure application range of efficient unloading. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of the three-dimensional structure of the present application Figure One ;

[0022] Figure 2 is a schematic diagram of the three-dimensional structure of the present application Figure Two ;

[0023] Figure 3 is a schematic diagram of the three-dimensional structure of the present application Figure Three ;

[0024] Figure 4 is a schematic diagram of the three-dimensional structure of the present application Figure Four ;

[0025] Figure 5 is a schematic diagram of the three-dimensional structure of the present application ;

[0026] Figure 6 is a schematic diagram of the three-dimensional structure of the present application Figure One ;

[0027] Figure 7 is a schematic diagram of the three-dimensional structure of the present application Figure Two ;

[0028] Figure 8 is a schematic diagram of the three-dimensional structure of the present application ;

[0029] Figure 9 is a schematic diagram of the three-dimensional structure of the present application Figure One ;

[0030] Figure 10 is a schematic diagram of the three-dimensional structure of the present application Figure Two ;

[0031] Figure 11 is a schematic diagram of the three-dimensional structure of the present application ;

[0032] Figure 12 is a schematic diagram of the three-dimensional structure of the present application Figure One ;

[0033] 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 Two .

[0034] 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

[0035] 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.

[0036] Embodiment 1, by Figures 1 to 5The present application comprises a rack 1, a first-stage reciprocating piston compressor 2, a second-stage reciprocating piston compressor 3, a third-stage reciprocating piston compressor 4, and a variable-stage air guide pipe group 7 installed on the cylinder intake end of the first-stage reciprocating piston compressor 2. A second-stage air inlet pipe 6 is installed between the gas tank outlet end of the first-stage reciprocating piston compressor 2 and the cylinder intake end of the second-stage reciprocating piston compressor 3. A first-stage air inlet pipe 5 is installed between the gas tank outlet end of the second-stage reciprocating piston compressor 3 and the cylinder intake end of the third-stage reciprocating piston compressor 4. The second-stage air inlet pipe 6 and the first-stage air inlet pipe 5 are in communication with the variable-stage air guide pipe group 7. At least three gear-type axial flow blower assemblies 9 are installed inside the rack 1 and opposite the compressor gas tank. A chain-type driving assembly 10 is installed inside the rack 1 to drive the multiple gear-type axial flow blower assemblies 9 to work synchronously. A driven-type impeller radial blower assembly 11 is installed at the bottom of the rack 1 and power-connected with one of the gear-type axial flow blower assemblies 9. The driven-type impeller radial blower assembly 11 is used to form a wind curtain below the compressor gas tank. A control box 8 is installed on one side of the back of the rack 1. The output end of the control box 8 is electrically connected with 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-type driving assembly 10.

[0037] A digital pressure gauge is installed at the top end of the gas 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 with the input end of the control box 8. A first on-off valve is installed at the exhaust port of the gas tank of the first-stage reciprocating piston compressor 2, the second-stage reciprocating piston compressor 3, and the third-stage reciprocating piston compressor 4. A second on-off valve is installed at the cylinder intake port of the first-stage reciprocating piston compressor 2, the second-stage reciprocating piston compressor 3, and the third-stage reciprocating piston compressor 4. The first on-off valve and the second on-off valve are used to control the opening and closing of the first-stage air inlet pipe 5 and the second-stage air inlet pipe 6.

[0038] When the hydrogen pressure in the tube bundle trailer is higher than the pressure of the hydrogen storage bottle group, which is usually about 14 MPa (G) to 20 MPa (G), the direct charging mode can be used. The control box 8 is used to control the process. At this time, all the compressors are not started, and the hydrogen is directly introduced from the tube bundle trailer into the hydrogen storage bottle group 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 to achieve energy-saving benefits.

[0039] When the process gas inlet pressure range is wider, more compressor variable stage compression can be used, and when the process gas inlet pressure range is narrower, less compressor variable stage compression can be used, not limited to one-stage reciprocating piston compressor 2, two-stage reciprocating piston compressor 3, and three-stage reciprocating piston compressor 4. At this time, the level valve connected with the compressor in the variable stage guide pipe group 7 also needs to be increased or decreased accordingly.

[0040] For example, it can be four-stage compression, changed to three-stage compression, changed to two-stage compression, and changed to one-stage compression. The compression variable stage is reversible. It can also be five-stage compression, changed to four-stage compression, changed to three-stage compression, changed to two-stage compression, and changed to one-stage compression. The compression variable stage is reversible. It can also be six-stage compression, changed to five-stage compression, changed to four-stage compression, changed to three-stage compression, changed to two-stage compression, and changed to one-stage compression. The compression variable stage is reversible. At the same time, the compressed process gas in the scheme can be any single component gas or mixed gas, not limited to hydrogen.

[0041] Example two, based on example one, Figure 6 and Figure 7 is given. The variable stage guide pipe group 7 includes an intake valve 703 installed on the intake end of the one-stage reciprocating piston compressor 2, a cross four-way pipe 701 installed at the end of the intake valve 703 away from the one-stage reciprocating piston compressor 2, and a three-stage control valve 704 installed at the left end inlet of the cross four-way pipe 701 through a pipeline. The lower end outlet of the cross four-way pipe 701 is provided with an exhaust valve 702, and the upper end outlet of the cross four-way pipe 701 is provided with an F-shaped shunt pipe 705. The two ends of the F-shaped shunt pipe 705 bifurcate and are respectively provided with a one-stage control valve 706 and a two-stage control valve 708. The three-stage control valve 704, the intake valve 703, the one-stage control valve 706, and the two-stage control valve 708 can all be electromagnetic valves. At this time, the input ends of each electromagnetic valve are electrically connected with the output end of the control box 8.

[0042] The one-stage control valve 706 is provided with a communication pipe one 707 connected with the one-stage intake pipe 5 at the end away from the F-shaped shunt pipe 705. The two-stage control valve 708 is provided with a communication pipe two 709 connected with the two-stage intake pipe 6 at the end away from the one-stage intake pipe 5.

[0043] If the hydrogen in the tube bundle trailer is in a low pressure state and needs full stage compression, the staff closes the exhaust valve 702, the second stage control valve 708, the first stage control valve 706, and opens the inlet valve 703, at this time the hydrogen enters the first reciprocating piston compressor 2 from the inlet valve 703, the hydrogen compressed by the first reciprocating piston compressor 2 enters the second reciprocating piston compressor 3 through the gas storage tank, the gas storage tank switch valve and the second inlet pipe 6, and is compressed again by the second reciprocating piston compressor 3 and enters the third reciprocating piston compressor 4 through the first inlet pipe 5, and the hydrogen is compressed again by the third reciprocating piston compressor 4 and finally sent into the hydrogen storage bottle group;

[0044] The hydrogen in the tube bundle trailer enters the cross four-way pipe 701 through the third stage control valve 704, if the hydrogen pressure in the tube bundle trailer is higher than the pressure of the hydrogen storage bottle group, the first stage control valve 706, the second stage control valve 708 and the inlet valve 703 are all in the normally closed state under the control of the control box 8, and then this part of hydrogen is directly discharged into the hydrogen storage bottle group through the exhaust valve 702;

[0045] The gas flow channel can be controlled by multiple groups of valves, and the control box 8 selects a specific valve combination to make the hydrogen enter, so that the variable stage gas guide pipe 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 as the compression starting point, and the high pressure gas only needs to experience the compression of the insufficient pressure section, avoiding the energy fault of “high pressure gas being reduced to low pressure and then being compressed by full pressure difference” in the traditional scheme.

[0046] In example three, based on example two, Figure 8 、 Figure 9 、 Figure 10 and Figure 11 are given, the chain drive assembly 10 includes a reduction motor 1001 mounted on one side of the back of the rack 1 and a chain wheel constant velocity transmission structure 1002 mounted at the end of the drive shaft of the reduction motor 1001 for driving each gear type axial flow blowing assembly 9 to work synchronously, the input end of the reduction motor 1001 is electrically connected with the output end of the control box 8, when cooling the compressor gas tank, the reduction motor 1001 is started by the control box 8, and the reduction motor 1001 synchronously delivers rotary power to the three gear type axial flow blowing assemblies 9 through the chain wheel constant velocity transmission structure 1002, and then the multiple gear type axial flow blowing assemblies 9 work synchronously;

[0047] The gear type axial flow blower assembly 9 is composed of 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, a pinion shaft 903 and a gear shaft 905 rotatably installed inside the main shaft cylinder 902 and the secondary shaft cylinder 904, the pinion shaft 903 and the gear shaft 905 are engaged with each other, one end of the gear shaft 905 penetrates to the outside of the secondary shaft cylinder 904 and is provided with a fan blade 907, the end of the pinion shaft 903 away from the fan blade 907 is kept in power connection with the rest of the gear type axial flow blower assemblies 9 through a chain wheel constant speed transmission structure 1002, and the driving shaft end of a reduction motor 1001 is fixedly connected with the pinion shaft 903 in one of the gear type axial flow blower assemblies 9 through a shaft coupling, and a cylinder type air baffle 906 is fixed on the outer wall of the side of the secondary shaft cylinder 904 close to the fan blade 907, the cylinder type air baffle 906 and the gear shaft 905 are coaxial with the gas tank of the compressor;

[0048] The pinion shaft 903 in the gear type axial flow blower assembly 9 receives the rotary power of the reduction motor 1001 through the chain wheel constant speed transmission structure 1002, and then the pinion shaft 903 drives the fan blade 907 to rotate through the gear shaft 905, so that the fan blade 907 generates axial airflow, and the part of the axial airflow is guided by the cylinder type air baffle 906 and continuously blows to the gas tank of the compressor, so as to rapidly export the compression heat through the full coverage forced convection heat dissipation on the surface of the gas tank of the compressor.

[0049] In the fourth embodiment, on the basis of the third embodiment, Figure 12 and Figure 13 The driven type impeller radial blower assembly 11 is composed of a shaft table 1105 fixed on the outer wall of one side of the inclined steel frame 901, a primary gear shaft 1106 and a secondary gear shaft 1108 rotatably installed inside the shaft table 1105, and a double-disc gear shaft 1107, a multi-wedge belt transmission structure 1109 is installed between the primary gear shaft 1106 and the pinion shaft 903, the primary gear shaft 1106 and the secondary gear shaft 1108 are engaged with the double-disc gear shaft 1107, the driven type impeller radial blower assembly 11 further comprises a air supply shell 1101 installed at the bottom of the frame 1, an impeller unit 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 inside of the air supply shell 1101 and is fixedly connected with one end of the impeller unit 1102;

[0050] The other side inside the shaft table 1105 is rotatably mounted with the driving bevel gear shaft 1104, the driving bevel gear shaft 1104 and the driven bevel gear shaft 1103 are engaged with each other, the driving bevel gear shaft 1104 and the secondary gear shaft 1108 are installed with the multi-wedge belt drive structure two 1110, one of the pinion shafts 903 in the gear type axial flow blower assembly 9 is driven by the multi-wedge belt drive structure one 1109 to rotate the primary gear shaft 1106, the primary gear shaft 1106 is engaged with one of the tooth plates of the double-disc gear shaft 1107, and then the other tooth plate of the double-disc gear shaft 1107 transmits the rotary power to the secondary gear shaft 1108, so that the secondary gear shaft 1108 drives the shaft table 1105 to rotate through the multi-wedge belt drive structure two 1110, and finally the shaft table 1105 drives the impeller unit 1102 in the air supply shell 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 below the three compressor gas tanks to quickly discharge heat and ensure that the working environment of the compressor is always within the appropriate range.

[0051] 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 14 MPa (G), the worker completes the physical connection of the hydrogen discharge port of the hydrogen tube bundle trailer and the gas inlet end of the variable-stage gas guide pipe group 7, and the gas outlet end of the three-stage reciprocating piston compressor 4 is connected with the gas inlet end of the hydrogen storage bottle group of the hydrogenation station, and the sealing performance is confirmed to meet the standard; the worker controls each stage valve in the variable-stage gas guide pipe group 7 to reset to the initial closed state through the control box 8, and activates the chain drive assembly 10 to work, the chain drive assembly 10 drives the three gear type axial flow blowing assemblies 9 to blow and ventilate 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, so as to cool down, and the driven type impeller radial blowing assembly 11 also receives the rotary power from the chain drive assembly 10 to form a continuous air curtain below 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 again; the control box 8 monitors and receives the outlet pressure of the hydrogen tube bundle trailer and the pressure of the hydrogen storage bottle group in real time, when the pressure of the hydrogen tube bundle trailer is lower than the pressure of the hydrogen storage bottle group, if the residual pressure is still significantly higher than the basic inlet pressure of the compressor, the compressor group is switched from the direct charging mode to the compressor compression mode, in 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 gas guide pipe group 7 dynamically opens the specific valve combination according to the instruction of the control box 8, for example, when a medium-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 started to work; hydrogen enters the preset compression stage under the accurate flow guide of the variable-stage gas guide pipe group 7: for medium-high pressure hydrogen, the hydrogen is directly injected into the second-stage reciprocating piston compressor 3 through the second-stage gas inlet pipe 6 and the variable-stage gas guide pipe group 7, the second-stage reciprocating piston compressor 3 serves as the starting compression stage, the piston inherits the pressure potential as the initial compression work when ascending, only necessary pressurization is applied to the gas to the target pressure, if low-pressure hydrogen needs three-stage compression, the hydrogen is directly sent into the first-stage reciprocating piston compressor 2 through the variable-stage gas guide pipe group 7, the first-stage reciprocating piston compressor 2 serves as the starting compression stage, and the hydrogen is sent into the hydrogen storage bottle group of the hydrogenation station after being compressed by the second-stage reciprocating piston compressor 3 and the third-stage reciprocating piston compressor 4, in the compression process, each gear type axial flow blowing assembly 9 forcibly cools the high-temperature gas storage tank of the compressor, and the driven type impeller radial blowing assembly 11 enhances the inter-stage cooling, further inhibiting the temperature rise of the hydrogen; as the pressure of the trailer continues to decrease, the control box 8 periodically rechecks the pressure difference, when the pressure difference is reduced to the next threshold value, such as from a medium-high pressure difference to a medium-low pressure difference, the variable-stage gas guide pipe group 7 and the corresponding first-stage reciprocating piston compressor 2, second-stage reciprocating piston compressor 3 and third-stage reciprocating piston compressor 4 are automatically controlled and the compression stage number is switched, and the hydrogen is transferred to a lower compression stage for pressurization;The compressed high-pressure hydrogen gas is directly sent to the hydrogen storage bottle group through the exhaust end of the final third reciprocating piston compressor 4. When the trailer pressure and the hydrogen storage bottle group pressure are balanced, the control box 8 closes all the valves, the stop command triggers the chain drive assembly 10 to run for a delay time to cool the compressor gas tank, the staff disconnects the pipeline connection between the compressor group and the hydrogen pipe bundle trailer, and all the valves of the variable-stage gas guide pipe group 7 are reset in standby mode.

[0052] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0053] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application 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 and a gear-type axial-flow blower assembly (9) opposite to the compressor air storage tank, a chain drive assembly (10) for driving multiple 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), and the driven impeller radial blower assembly (11) is used to form an air curtain below the compressor air storage tank, and a control box (8) is installed on one side of the back of the frame (1), and 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); The gas 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; the variable-stage air guide pipe group (7) includes an air inlet valve (703) installed on the air inlet end of the first-stage reciprocating piston compressor (2), a cross four-way pipe (701) installed at one end of the air inlet valve (703) away from the first-stage reciprocating piston compressor (2), and a cross four-way pipe ( The left end inlet of the cross-shaped four-way pipe (701) is connected to a three-stage control valve (704) installed through a pipeline, and the lower end outlet of the cross-shaped four-way pipe (701) is equipped with an exhaust valve (702); the upper end outlet of the cross-shaped four-way pipe (701) is equipped with an F-type diverter pipe (705), and 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), and the end of the first-stage control valve (706) away from the F-type diverter pipe (705) is equipped with a connecting pipe 1 (707) that is interconnected with the first-stage intake pipe (5), and the end of the second-stage control valve (708) away from the first-stage intake pipe (5) is equipped with a connecting pipe 2 (709) that is interconnected with the second-stage intake pipe (6); A controllable air flow channel is formed by a plurality of valve groups. 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, a specific valve combination is selectively opened, so that when hydrogen enters, the variable-stage air guide pipe group can skip the first-stage reciprocating piston compressor (2) and directly cut into the second-stage reciprocating piston compressor (3) or the third-stage reciprocating piston compressor (4), so that the gas inherits the original pressure potential energy as the compression starting point, and the high-pressure gas only needs to undergo compression in the insufficient pressure section.

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 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).

4. The hydrogen variable-stage compression reciprocating piston compressor unit according to claim 3, 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.

5. The hydrogen variable-stage compression reciprocating piston compressor unit according to claim 4, 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.

6. The hydrogen variable-stage compression reciprocating piston compressor unit according to claim 5, 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).

7. The hydrogen variable-stage compression reciprocating piston compressor unit according to claim 6, 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).

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