Hydrogen compressor booster pump

Abstract

The utility model discloses a booster pump of a hydrogen compressor, which comprises a base, and a hydrogen compression cylinder, a driving system and a balance gas tank are arranged on the base. The driving system drives a piston in the hydrogen compression cylinder to move back and forth to compress hydrogen in the cylinder body; the hydrogen compression cylinder is a composite cylinder body; two independent compression chambers are symmetrically arranged in the hydrogen compression cylinder, the balance gas tank is used for balancing the two compression chambers, and a gas inlet and a gas outlet which are communicated with the compression chambers are formed in the hydrogen compression cylinder; and one-way valves are arranged at the air inlet and the air outlet, and efficient compression of hydrogen can be achieved through the double compression cavities which are symmetrically arranged.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen compression equipment, in particular to a hydrogen compressor booster pump. Background Art

[0002] Hydrogen energy refers to the chemical energy released by the chemical reaction of hydrogen and oxygen. It is a clean secondary energy source with the advantages of high energy density, high combustion calorific value, wide source, storability, renewable, electric and combustible, zero pollution, and zero carbon emission. A hydrogen refueling station is a special place for filling hydrogen fuel into hydrogen storage bottles of hydrogen fuel cell vehicles, hydrogen internal combustion engine vehicles, or hydrogen and natural gas hybrid fuel vehicles. The hydrogen compressor is the core equipment of the hydrogen refueling station. In order to ensure the purity and compression ratio of hydrogen, the hydrogen compressors used in domestic hydrogen refueling stations are now metal diaphragm compressors. The metal diaphragm compressor is a mechanical piston compressor that drives the hydraulic oil through the piston, thereby driving the metal diaphragm to reciprocate in the cylinder to compress and transport hydrogen. This metal diaphragm compressor has a complex structure, a low diaphragm service life, and a special dome surface of the cover plate, which is difficult to process and has a high manufacturing price. Utility Model Content

[0003] The purpose of the utility model is to overcome the problems existing in the prior art and provide solutions to the problems existing in the prior art. On the one hand, the compressed gas can be free from contamination by hydraulic oil and the purity of the gas can be guaranteed. In addition, the utility model is also equipped with a balancing gas tank, which can prevent a negative pressure vacuum state from occurring during the operation of the hydrogen compression cylinder. The symmetrically arranged double compression chambers can be used to achieve efficient compression of hydrogen.

[0004] The utility model is realized by the following technical solutions:

[0005] A hydrogen compressor booster pump comprises a base, on which a hydrogen compression cylinder, a driving system and a balancing gas tank are arranged; the driving system drives the piston in the hydrogen compression cylinder to move back and forth to compress the hydrogen in the cylinder body; the hydrogen compression cylinder is a composite cylinder body; two independent compression chambers are symmetrically arranged in the hydrogen compression cylinder, the balancing gas tank is used to balance the two compression chambers, and the hydrogen compression cylinder is provided with an air inlet and an air outlet connected to the compression chambers; and one-way valves are arranged at the air inlet and the air outlet.

[0006] In order to further optimize the utility model, the following technical solutions can be preferably used:

[0007] Preferably, it further comprises a hydraulic oil recovery tank, the driving system is a hydraulic system, the hydrogen compression cylinder is composed of coaxial cylinder I, hydraulic cylinder, and cylinder II; cylinder I and cylinder II are located on both sides of the hydraulic cylinder, and both ends of the hydraulic cylinder are connected to cylinder I and cylinder II respectively through block I and block II;

[0008] A piston is arranged in the cylinder I, and the piston divides the cylinder I into a compression chamber I and a buffer chamber I, and the buffer chamber I is adjacent to the stopper I; a piston is also arranged in the cylinder II; a piston is also arranged in the cylinder II, and the piston divides the cylinder II into a buffer chamber II and a compression chamber II, and the buffer chamber II is adjacent to the stopper II;

[0009] The piston in the cylinder I, the piston in the hydraulic cylinder and the piston in the cylinder II are connected together through a piston rod that runs through the cylinder I, the block I, the hydraulic cylinder, the block II and the cylinder II to form a whole and perform linkage; the hydraulic system drives the piston in the hydraulic cylinder to reciprocate, and the piston in the hydraulic cylinder drives the piston in the cylinder I and the piston in the cylinder II to reciprocate through the piston rod, and the hydrogen is compressed and output through the cylinder I and the cylinder II;

[0010] The block I is provided with an air path channel I connected to the buffer chamber I, the block II is provided with an air path channel II connected to the buffer chamber II, and the balancing gas tank is arranged between the air path channel I and the air path channel II; the block I is provided with a hydraulic oil recovery port I at a position where the piston rod is in contact with the block I, the block II is provided with a hydraulic oil recovery port II at a position where the piston rod is in contact with the block II, and a hydraulic oil recovery tank is connected between the hydraulic oil recovery port I and the hydraulic oil recovery port II.

[0011] Preferably, the composite cylinder body includes an outer high-strength alloy steel cylinder barrel, an inner hydrogen embrittlement-resistant ceramic barrel is installed inside the high-strength alloy steel cylinder barrel, the outer high-strength alloy steel cylinder barrel and the inner ceramic barrel are interference fit, and the high-strength alloy steel cylinder barrel and the ceramic barrel are connected by hot and cold assembly.

[0012] Preferably, the high-strength alloy steel cylinder is one of a high-strength steel cylinder, a high-strength titanium alloy cylinder, and a high-strength aluminum alloy high-strength steel cylinder; the ceramic cylinder adopts one of oxide ceramics, chromium ceramics, carbide ceramics, boride ceramics, and nitride ceramics; the ceramic cylinder adopts one of an alumina ceramic cylinder, a zirconium oxide ceramic cylinder, a silicon carbide ceramic cylinder, a boron carbide ceramic cylinder, or a boron nitride ceramic cylinder.

[0013] Preferably, the composite cylinder body comprises a single-material metal cylinder barrel, and the single-material metal cylinder barrel is sprayed with a wear-resistant material layer both inside and outside.

[0014] Preferably, the wear-resistant material layer is a PVD coating or a CVD coating; the single-material metal cylinder is a hydrogen embrittlement-resistant metal; and the thickness of the wear-resistant material layer is 0.06-0.1 mm.

[0015] Preferably, the driving system is an electric cylinder, and a compression piston rod is coaxially arranged in the hydrogen compression cylinder. One end of the compression piston rod extends into the compression chamber in the hydrogen compression cylinder and is connected to a piston, and the other end of the compression piston rod extends to the electric cylinder and is connected thereto, and the electric cylinder drives the compression piston rod to reciprocate in a linear motion.

[0016] Preferably, a transition transmission isolation part is further provided between the hydrogen compression cylinder and the electric cylinder, a variable diameter transmission shaft is movably provided in the transition transmission isolation part, one end of the variable diameter transmission shaft is connected to the compression piston rod, and the other end of the variable diameter transmission shaft is connected to the electric cylinder; the transition transmission isolation part and the gas booster cylinder part are coaxially arranged, and a connecting rod is provided on the pump body at a peripheral position corresponding to the transition transmission isolation part and the gas booster cylinder part.

[0017] Preferably, the electric cylinder comprises an interconnected motor and a drive cylinder body, the output shaft of the motor is transmission-connected to the drive shaft of the drive cylinder body, the drive cylinder body, the gas booster cylinder part and the transmission part are coaxially arranged, and the drive shaft of the drive cylinder body is connected to the variable-diameter transmission shaft.

[0018] Preferably, a ventilation end cover is provided on the outer side of the hydrogen compression cylinder, a ventilation hole is provided inside the ventilation end cover, and a driving hole is provided on the oil cylinder; recovery grooves with annular structural grooves are provided on both sides of the oil cylinder, the recovery grooves are connected with the recovery hole, and the recovery hole is connected with the hydraulic oil recovery tank device.

[0019] Preferably, the hydrogen compression cylinder includes a cylinder liner, a cylinder seat, and a cooling water jacket sleeved outside the cylinder liner. The cooling water jacket is provided outside the cylinder liner, and the cooling water jacket is provided with a water inlet and a water outlet. Cooling water flows in the spiral cooling water jacket.

[0020] The utility model has the following effects:

[0021] 1. In the utility model, the hydrogen working area and the hydraulic driving area are isolated from each other by a hydrogen compression cylinder composed of coaxial cylinders I, hydraulic cylinders and cylinders II, so as to ensure that the compressed gas is not polluted by hydraulic oil and the purity of the gas is ensured; cylinders I and II are located on both sides of the hydraulic cylinder, and the two ends of the hydraulic cylinder are connected to cylinders I and II respectively through blocks I and blocks II. In the utility model, cylinders I and II have the same inner diameter and are arranged symmetrically, so as to ensure that the piston force in cylinder I and the piston force in cylinder II can be balanced with each other to reduce the power consumption. In addition, the same model is selected for symmetrical arrangement, which can further reduce the probability of uneven force during the use of the equipment.

[0022] 2. On the one hand, the utility model separates oil and gas in the hydraulic cylinder and the air cylinder through the seal on the block and the scraper plate to ensure that the compressed gas is not contaminated by the hydraulic oil and the purity of the gas. In addition, the utility model is also equipped with a balancing gas tank and a hydraulic oil recovery tank. The balancing gas tank can prevent the negative pressure vacuum state from occurring during the operation of the hydrogen compression cylinder. The hydraulic oil recovery tank is convenient for recovering the hydraulic oil on the piston rod. At the same time, a spiral cooling water jacket is installed on the outside of the cylinder sleeve, and the cylinder can be further cooled by the spiral cooling water jacket.

[0023] 3. In addition, the utility model specially designs the cylinder body according to the compression object, and provides two implementation plans, wherein the cylinder body designed by the spray-type structure is suitable for the special environment of hydrogen compression, the cylinder body is made of hydrogen embrittlement-resistant material, and the inside and outside of the cylinder body are sprayed with wear-resistant material by PVD spraying process. The PVD material has many advantages, such as particularly strong adhesion, particularly high hardness, Vickers 3500, high temperature resistance of 600-900℃, low friction coefficient, corrosion resistance, etc., which solves the problem that the strength of the original single material and hydrogen embrittlement resistance cannot be combined, and achieves high strength, good hydrogen embrittlement resistance and other effects; or the cylinder body designed by the composite structure is suitable for the special environment of hydrogen compression, wherein the inner layer of the ceramic tube can ensure excellent hydrogen embrittlement resistance and also has good wear resistance, and the external high-strength alloy steel makes up for the defect of low toughness of the ceramic material, which solves the problem that the strength of the original single material and hydrogen embrittlement resistance cannot be combined, and achieves high strength, good hydrogen embrittlement resistance and other effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the internal structure of the hydrogen hydraulic compressor booster pump in Example 1;

[0025] Figure 2 Schematic diagram of the internal structure of the cylinder in Example 1;

[0026] Figure 3 This is a schematic diagram of the piston rod structure in Example 1;

[0027] Figure 4 This is a schematic diagram of the overall structure of the hydrogen hydraulic compressor booster pump in Example 2;

[0028] Figure 5 This is a schematic diagram of the internal structure of the hydrogen hydraulic compressor booster pump in Example 2;

[0029] Figure 6 It is a schematic diagram of the structure of the composite cylinder in Example 4;

[0030] Figure 7 This is a schematic diagram of the structure of the composite cylinder in Example 5.

[0031] in:

[0032] Among them, 1-cylinder Ⅰ, 2-hydraulic cylinder, 3-cylinder Ⅱ, 4-block Ⅰ, 5-block Ⅱ, 6-cylinder Ⅰ piston, 7-hydraulic cylinder piston, 8-cylinder Ⅱ piston, 9-balance gas tank, 10-hydraulic oil recovery tank, 11-exhaust port, 12-cylinder head, 13-air inlet, 14-cylinder seat one-way valve, 15-cylinder liner, 16-spiral cooling water jacket, 17-water inlet, 18-water outlet, 19-gas path Ⅰ, 20-hydraulic system oil port, 21-hydraulic oil recovery port Ⅰ, 22-support ring, 23-dustproof ring, 24-piston rod sealing ring.

[0033] 201-pump body, 202-transition transmission isolation part; 203-gas booster cylinder part; 204-drive cylinder body; 205-motor; 206-connecting rod; 213-sealing ring; 214-variable transmission shaft; 215-drive shaft.

[0034] 301-single material metal cylinder; 302-wear-resistant material layer.

[0035] 401-high strength alloy steel cylinder; 402-ceramic cylinder. DETAILED DESCRIPTION

[0036] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The following will be combined with the drawings in the utility model embodiments to clearly and completely describe the technical solutions in the utility model embodiments. Obviously, the described embodiments are only part of the utility model embodiments, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] Embodiment 1:

[0039] like Figure 1-3As shown, a hydrogen liquid-driven compressor booster pump comprises a base, on which a hydrogen compression cylinder, a hydraulic system, a balancing gas tank 9, and a hydraulic oil recovery tank 10 are installed; the hydraulic system drives the piston in the hydrogen compression cylinder to move back and forth to compress the hydrogen in the cylinder body; wherein the hydrogen compression cylinder is composed of a coaxial cylinder Ⅰ1, a hydraulic cylinder 2, and a cylinder Ⅱ3; cylinder Ⅰ and cylinder Ⅱ are located on both sides of the hydraulic cylinder, and the two ends of the hydraulic cylinder are respectively connected to cylinder Ⅰ and cylinder Ⅱ through a block Ⅰ4 and a block Ⅱ5; a cylinder Ⅰ piston is installed in cylinder Ⅰ, and the cylinder Ⅰ piston divides cylinder Ⅰ into a compression gas chamber Ⅰ and a buffer chamber Ⅰ, and the buffer chamber Ⅰ is adjacent to the block Ⅰ; a cylinder Ⅱ piston is also installed in cylinder Ⅱ; the cylinder Ⅱ piston divides cylinder Ⅱ into a buffer chamber Ⅱ and The compression chamber II, the buffer chamber II and the block II are adjacent; the cylinder I piston in the cylinder I, the hydraulic cylinder piston in the hydraulic cylinder and the cylinder II piston in the cylinder II are connected together through the piston rod that runs through the cylinder I, the block I, the hydraulic cylinder, the block II and the cylinder II, forming a whole and performing linkage; the hydraulic system drives the hydraulic cylinder piston in the hydraulic cylinder to reciprocate, and the hydraulic cylinder piston 7 in the hydraulic cylinder drives the cylinder I piston 6 in the cylinder I and the cylinder II piston 8 in the cylinder II to reciprocate through the piston rod, and the hydrogen is compressed and output through the cylinder I and the cylinder II; the function of the hydraulic system is to drive the piston in the hydraulic cylinder constituting the hydrogen hydraulic compressor booster pump to reciprocate, and then drive the piston in the hydrogen compression cylinder to reciprocate to compress the hydrogen. The piston rod is composed of two piston rod units connected end to end, and the two piston rod units are connected through the piston in the hydraulic cylinder, and the outer end of the piston rod unit is respectively connected to the cylinder I piston and the cylinder II piston.

[0040] Furthermore, a gas path channel I19 connected to the buffer chamber I is opened on the block I, and a gas path channel II connected to the buffer chamber II is opened on the block II, and the balance gas tank 9 is installed between the gas path channel I19 and the gas path channel II; an exhaust port 13 is installed on the balance gas tank 9, and the balance gas tank is used to assist the operation of the cylinder I and the cylinder II constituting the hydrogen hydraulic compressor booster pump, thereby improving the stability of operation and increasing the service life.

[0041] In the present invention, a hydraulic oil recovery port I 21 is provided on the block I at the position where the piston rod is in contact with the piston rod, and a hydraulic oil recovery port II is provided on the block II at the position where the piston rod is in contact with the piston rod. A hydraulic oil recovery tank 10 is connected between the hydraulic oil recovery port I and the hydraulic oil recovery port II, so that the trace hydraulic oil brought out by the piston rod of the hydraulic cylinder will not enter the cylinder I and the cylinder II, so as to ensure that even if hydrogen or hydraulic oil leaks, they will not contaminate each other, thereby ensuring the purity of hydrogen, and at the same time, it can also be recovered to reduce the pollution hazard to the environment.

[0042] Cylinder I and cylinder II are composed of a cylinder head, a cylinder liner, a cylinder seat, a piston built into the cylinder body and a spiral cooling water jacket 16 sleeved outside the cylinder liner. Cylinder I and cylinder II are a closed cylinder body; an air inlet and an air outlet are provided on the cylinder head, and a cylinder seat check valve 14 is installed at the air inlet and the air outlet. This design can reduce the clearance of the hydrogen compression cylinder and improve the compression efficiency; a spiral cooling water jacket 16 is provided outside the cylinder liner 15, and a water inlet 17 and a water outlet 18 are provided on the water jacket. Cooling water flows in the spiral cooling water jacket. When the piston reciprocates in the cylinder, a large amount of heat will be generated. The cooling water filled in the water jacket can cool the cylinder body, ensure safety, and extend the service life of the piston; the piston built into the cylinder body is connected to the piston rod by bolts, which is convenient for later maintenance and replacement. An exhaust port is installed on the balance gas tank, and a check valve is installed at the external interface position of the gas channel I and the gas channel II. Hydraulic system oil ports communicating with the inner chamber of the hydraulic cylinder are installed on both the block I and the block II, and the hydraulic system oil ports 20 are connected to the hydraulic system through pipelines.

[0043] Furthermore, in the present invention, the inner diameters of cylinders I and II are the same and they are arranged symmetrically, the purpose of which is to ensure that the piston force in cylinder I and the piston force in cylinder II can be balanced with each other to reduce the power consumption. In addition, the same model is selected for symmetrical arrangement, which can further reduce the probability of uneven force during the use of the equipment. Piston rod sealing rings 24, dust rings 23, and support rings 22 are coaxially installed on block I and block II in the direction toward cylinder I and cylinder II, and multiple piston rod sealing rings on block I are symmetrically installed along hydraulic oil recovery port I, and multiple piston rod sealing rings on block II are symmetrically installed along hydraulic oil recovery port II to ensure that there is no gas leakage. The working pressure of the piston ring reaches 90MPa. The piston ring is a self-lubricating piston ring, which does not require lubricating oil during operation and will not cause pollution to the hydrogen.

[0044] As a preferred solution, in the present invention, both ends of block I are respectively equipped with bosses I that cooperate with the cylinder body of cylinder I and the inner wall of the cylinder body of the hydraulic cylinder, and both ends of block II are respectively equipped with bosses II that cooperate with the cylinder body of cylinder II and the inner wall of the cylinder body of the hydraulic cylinder. Seals are installed at the two contact surface positions of block I and cylinder I, and seals are installed at the two contact surface positions of block II and cylinder II, which can further improve the sealing performance at the connection position and prevent air leakage and liquid leakage.

[0045] Embodiment 2:

[0046] The driving system is an electric cylinder, wherein a compression piston rod is coaxially arranged in the hydrogen compression cylinder, one end of the compression piston rod extends into the compression chamber in the hydrogen compression cylinder and is connected to a piston, the other end of the compression piston rod extends to the electric cylinder and is connected, and the electric cylinder drives the compression piston rod to reciprocate and linearly move; it comprises a pump body 201, the pump body 201 comprises a connected transition transmission isolation part 202 and a gas booster cylinder part 203, a compression piston rod is installed in the pump body at positions corresponding to the transition transmission isolation part and the gas booster cylinder part, one end of the compression piston rod extends into the compression chamber of the gas booster cylinder part and is connected to a piston, the other end of the compression piston rod extends into the transition transmission isolation part, a variable diameter transmission shaft 214 is movably installed in the transition transmission isolation part, one end of the variable diameter transmission shaft 214 is connected to the compression piston rod, the other end of the variable diameter transmission shaft 214 is connected to the electric cylinder, and the electric cylinder drives the variable diameter transmission shaft and the compression piston rod to reciprocate and linearly move;

[0047] There are two groups of gas booster cylinder parts and transition transmission isolation parts symmetrically designed, and the electric cylinder is arranged between the two groups of transition transmission isolation parts, so that double-sided compression can be achieved within one movement cycle, thereby improving the gas compression efficiency; the transition transmission isolation part and the gas booster cylinder part are coaxially installed, and a connecting rod 206 is installed on the pump body at the outer position corresponding to the transition transmission isolation part and the gas booster cylinder part, so as to improve the overall structural strength.

[0048] In addition, a plurality of sealing rings 213 are installed on the pump body at transition positions corresponding to the transition transmission isolation part and the gas boost cylinder part, and the sealing rings 213 are slidably and sealingly connected with the outer wall of the compression piston rod.

[0049] Electric cylinders came into being as a precisely controlled electric linear actuator. Compared with hydraulic cylinders (pumps) and pneumatic cylinders (pumps), the working performance of electric cylinders is not easily affected by the external environment. Electric cylinders do not need complex pumps, valves, and hydraulic pipelines like hydraulic systems, and have a simple structure. The performance of electric cylinders is close to that of pneumatic cylinders and hydraulic cylinders, but the principles of electric cylinders and hydraulic cylinders are different. Electric cylinders convert electrical energy into mechanical energy. This process is completely realized by mechanical structures. Compared with pneumatic cylinders and hydraulic cylinders, the advantages of electric cylinders are: the rigidity of the cylinder body will not be affected by the compressibility of gas and liquid; electric cylinders are directly driven by motors to achieve linear motion output. Compared with hydraulic cylinders, no additional auxiliary devices are required, the structure is compact, pollution-free, and it has good controllability. Electric cylinders have high precision, fast response, good electrical system synchronization, and stable operation, which can meet the needs of most work occasions. Therefore, it has become an inevitable trend for electric cylinders to replace hydraulic cylinders and pneumatic cylinders in actual engineering applications.

[0050] Electric cylinders can be divided into linear, return and vertical types according to the motor mounting structure; they can be divided into ladder screw electric cylinders, ball screw electric cylinders and planetary roller screw electric cylinders according to the type of spiral transmission mechanism; they can be divided into DC servo electric cylinders, AC servo electric cylinders and stepper servo electric cylinders according to the motor type; they can be divided into single-stage electric cylinders and multi-stage electric cylinders according to the combination of thrust sleeves.

[0051] 1. Classification by motor installation structure

[0052] (1) Linear electric cylinder: the motor and the lead screw are installed on the same straight line. The linear electric cylinder reduces the inertia and clearance of the intermediate links, has a simple structure and is easy to install. (2) Folding electric cylinder: the motor and the lead screw are not on the same straight line, and the motor and lead screw installation axes are parallel to each other. The overall length of the folding electric cylinder is shorter.

[0053] (3) Vertical electric cylinder: The motor and the screw installation axes are perpendicular to each other. The vertical electric cylinder generally uses a worm gear as a reduction device. Its total length is short and it is more suitable for occasions with small installation space. It can achieve a large reduction ratio, small drive power, and large thrust.

[0054] 2. Classification by type of screw transmission mechanism

[0055] (1) Trapezoidal screw electric cylinder. The screw pair of this electric cylinder adopts a trapezoidal screw sliding screw pair. Due to its disadvantages such as large transmission friction resistance and low transmission efficiency, it is rarely used in small load and high-speed electric cylinders. However, because it has a certain self-locking ability, it is used in occasions with specific self-locking requirements; (2) Ball screw electric cylinder. The ball screw is one of the most commonly used transmission components of electric cylinders. The ball rolls in the raceway between the screw shaft and the screw nut of the ball screw pair. Under the same conditions, rolling friction is higher than sliding friction contact. The surface friction factor is much smaller, so the electric cylinder using ball screw can obtain higher motion efficiency while having high precision and reversibility; (3) Planetary roller screw electric cylinder, the electric cylinder spiral pair uses planetary roller screw, the screw can be regarded as the sun gear, the roller can be regarded as the planetary gear, the gears on both sides of the roller can ensure the synchronization of the meshing transmission between the roller and the screw and the nut and the pure rolling on the end section, it has large load capacity, high transmission accuracy and high efficiency, but currently due to the limitations of related design technology and processing technology and equipment, the scope of use is relatively small. The advantage of planetary roller screw and ball screw is that they can provide higher rated dynamic and static loads than ball screws. The threaded rollers replace the balls, which will quickly release the load through many contact lines, so that they can have higher impact resistance. Both planetary roller screws and ball screws are applicable to Hertz's law. According to Hertz's pressure law, it can be concluded that the static load that planetary roller screws can withstand is 3 times that of ball screws, and the life is 15 times that of ball screws. It also has the advantages of large carrying capacity, high reliability, strong environmental adaptability, strong stealth capability and low noise.

[0056] 3. Classification by motor type

[0057] (1) DC servo electric cylinder: an electric cylinder mechanism that uses a DC servo motor as the power source. The DC servo motor introduces a mechanical commutation device, which has a complex structure, high cost, and limits the motor's capacity and movement speed. The motor's armature is on the rotor, which makes the motor inefficient and has poor heat dissipation. The DC servo motor uses the working principle of the electromagnetic force law. The two independent variables related to the electromagnetic torque are the main magnetic flux and the armature current, which control the excitation current and the armature current respectively, and can easily control the torque and speed. (2) AC servo electric cylinder system, in view of the defects of the DC electric cylinder, the electric drive winding is assembled on the stator and the rotor is the permanent magnet part. The encoder on the rotor shaft measures the magnetic pole position, which constitutes a permanent magnet brushless motor. The vector control method is used to make the AC servo system have good servo characteristics. Its wide speed regulation range, high steady speed accuracy, fast dynamic response and other good technical performance make its dynamic and static characteristics completely comparable to those of the DC servo system. At the same time, it can realize weak magnetic high-speed control, broaden the speed regulation range of the system, and meet the requirements of high-performance servo drive. (3) Stepper servo electric cylinder: The stepper servo system has a simple structure and meets the needs of system digital development, but it has poor accuracy, high energy consumption, low speed, and the greater the power, the lower the moving speed. In particular, the stepper servo is prone to losing steps, so it is mainly used for economical CNC machine tools and old equipment renovation with low speed and accuracy requirements.

[0058] 4. Classification by the combination of thrust sleeves: (1) Single-stage electric cylinder, the actuator of the single-stage electric cylinder is composed of a single-stage piston rod; (2) Multi-stage electric cylinder, the motion actuator of the multi-stage electric cylinder is composed of a multi-stage piston rod mechanism in series. At present, multi-stage electric cylinders mainly include hollow screw type, pulley type, etc.

[0059] As one of the electric cylinder structures of this embodiment, the electric cylinder adopts a reciprocating electric cylinder, which includes a motor 205 and a drive cylinder body 204 that are connected to each other. The output shaft of the motor is connected to the drive shaft 215 of the drive cylinder body through transmission. The drive cylinder body, the gas booster cylinder part and the transmission part are coaxially arranged. The drive shaft 215 of the drive cylinder body 204 is connected to the variable diameter transmission shaft. The electric cylinder module involved in this product can adopt the above-mentioned electric cylinder of the same type for alternative drive according to the requirements of the usage scenario.

[0060] Embodiment 2:

[0061] like Figure 3 As shown, the difference between this embodiment and embodiment 1 is that:

[0062] Embodiment 3:

[0063] The difference between this embodiment and Embodiment 1 is that the transition transmission isolation part is cancelled, and the specific structure is as follows: a gas booster pump driven by an electric cylinder includes a pump body, the pump body includes a gas booster cylinder part and an electric cylinder, the gas booster cylinder part includes a compression chamber, the gas booster cylinder part is provided with an air inlet and an air outlet connected to the compression chamber, a compression piston rod is installed in the pump body at a position corresponding to the gas booster cylinder part, one end of the compression piston rod extends into the compression chamber of the gas booster cylinder part and is connected to a piston, and the other end of the compression piston rod extends to be connected to the electric cylinder, and the electric cylinder drives the compression piston rod to reciprocate linear motion.

[0064] Embodiment 4:

[0065] The main improvement direction of this embodiment is: according to the compression object, the material and structure of the cylinder body are designed, specifically: the composite cylinder body includes a single material metal cylinder barrel 301, and the single material metal cylinder barrel is sprayed with a wear-resistant material layer 302 inside and outside; the wear-resistant material layer is a PVD coating or a CVD coating. The single material metal cylinder barrel is a hydrogen embrittlement resistant metal. PVD (Physical Vapor Deposition)---Physical vapor deposition: Under vacuum conditions, a physical method is used to vaporize the surface of the material source into gaseous atoms, molecules or partially ionized into ions, and a low-pressure gas (or plasma) process is used to deposit a thin film with certain special functions on the surface of the substrate. The main advantages of PVD coatings are high hardness, high wear resistance, high temperature resistance, and low friction coefficient. It can significantly improve the service life and surface finish of the tooling. PVD refinement types include: TIN-titanium nitride, CRN-chromium nitride, TICN-titanium carbonitride, TIALN-aluminum titanium nitride, CRAN-chromium aluminum titanium nitride

[0066] CVD coating belongs to atomic deposition. It is a method that uses the vapor of metal halides, hydrogen and other chemical components to decompose, heat-bond and other gas-solid reaction deposits at a high temperature of 950-1050°C to form a solid deposition layer on the surface of the heated substrate in the form of atoms, ions, molecules and other atomic scales. The process includes three stages: material vaporization, transportation to the vicinity of the substrate and formation of a covering layer on the substrate.

[0067] Embodiment 5:

[0068] The main improvement direction of this embodiment is: according to the compression object, the material and structure of the cylinder body are designed, specifically: the cylinder body is a composite cylinder body, the composite cylinder body includes an outer high-strength alloy steel cylinder barrel 401, the high-strength alloy steel cylinder barrel is equipped with an inner layer of hydrogen embrittlement-resistant ceramic barrel 402, the outer high-strength alloy steel cylinder barrel and the inner layer of ceramic barrel are interference fit to ensure the connection stability after embedding, and the high-strength alloy steel cylinder barrel and the ceramic barrel are connected by cold assembly. The wall thickness of the high-strength alloy steel cylinder barrel is larger than the wall thickness of the ceramic barrel, and the high-strength alloy steel cylinder barrel is one of a high-strength steel cylinder barrel, a high-strength titanium alloy cylinder barrel, and a high-strength aluminum alloy high-strength steel cylinder barrel; the ceramic barrel is one of oxide ceramics, vanadium ceramics, carbide ceramics, boride ceramics, and nitride ceramics.

[0069] The preparation steps of the composite cylinder body are as follows:

[0070] S1: Pretreatment, firstly, the inner ceramic barrel and high-strength alloy steel cylinder are subjected to surface processing, wherein the wall thickness of the high-strength alloy steel cylinder shall meet the relevant pressure calculation requirements, the inner hole size tolerance of the high-strength alloy steel cylinder shall be less than 0.04mm, the straightness tolerance of the high-strength alloy steel cylinder shall be less than 0.04, the cylindricity tolerance of the high-strength alloy steel cylinder shall be less than 0.02, and the finish of the high-strength alloy steel cylinder shall be less than 0.4; wherein the wall thickness of the inner ceramic barrel shall meet the pressure calculation requirements, the outer wall size tolerance of the inner ceramic barrel shall be less than 0.04mm, the straightness tolerance of the inner ceramic barrel shall be less than 0.04, the cylindricity tolerance of the inner ceramic barrel shall be less than 0,02, and the finish of the inner ceramic barrel shall be less than 0.4;

[0071] S2: Cold assembly; heat the high-strength alloy steel cylinder barrel after surface processing in S1 to 400 degrees Celsius, keep it warm for 3 hours, then take the heated high-strength alloy steel cylinder barrel out of the heating furnace and quickly insert the inner layer ceramic after surface processing in S1 into the hole of the high-strength alloy steel cylinder barrel; then cool it naturally to room temperature;

[0072] S3: Quality inspection: Manually inspect the surface of the processed product to ensure that there are no pits, protrusions, or deformation on the inner wall surface. Performance test data for the composite cylinder block: After the composite cylinder liner is completed, the strength meets the design requirements, the coaxiality requirement is less than 0.03, the straightness requirement is less than 0.015, the cylindricity requirement is less than 0.02, the roundness requirement is less than 0.01, and the finish requirement is less than 0.1.

[0073] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydrogen compressor booster pump, characterized in that: It comprises a base, on which a hydrogen compression cylinder, a driving system and a balancing gas tank are arranged; the driving system drives the piston in the hydrogen compression cylinder to move back and forth to compress the hydrogen in the cylinder body; the hydrogen compression cylinder is a composite cylinder body; two independent compression chambers are symmetrically arranged in the hydrogen compression cylinder, the balancing gas tank is used to balance the two compression chambers, and the hydrogen compression cylinder is provided with an air inlet and an air outlet connected with the compression chambers; and a one-way valve is arranged at the air inlet and the air outlet; The driving system is an electric cylinder. A compression piston rod is coaxially arranged in the hydrogen compression cylinder. One end of the compression piston rod extends into the compression chamber in the hydrogen compression cylinder and is connected to a piston. The other end of the compression piston rod extends to the electric cylinder and is connected thereto. The electric cylinder drives the compression piston rod to reciprocate in a linear motion.

2. A hydrogen compressor booster pump according to claim 1, characterized in that: It also includes a hydraulic oil recovery tank, the driving system is a hydraulic system, and the hydrogen compression cylinder is composed of a coaxial cylinder I, a hydraulic cylinder, and a cylinder II; cylinder I and cylinder II are located on both sides of the hydraulic cylinder, and the two ends of the hydraulic cylinder are connected to cylinder I and cylinder II respectively through a block I and a block II; A piston is arranged in the cylinder I, and the piston divides the cylinder I into a compression chamber I and a buffer chamber I, and the buffer chamber I is adjacent to the stopper I; a piston is also arranged in the cylinder II; a piston is also arranged in the cylinder II, and the piston divides the cylinder II into a buffer chamber II and a compression chamber II, and the buffer chamber II is adjacent to the stopper II; The piston in the cylinder I, the piston in the hydraulic cylinder and the piston in the cylinder II are connected together through a piston rod that runs through the cylinder I, the block I, the hydraulic cylinder, the block II and the cylinder II to form a whole and perform linkage; the hydraulic system drives the piston in the hydraulic cylinder to reciprocate, and the piston in the hydraulic cylinder drives the piston in the cylinder I and the piston in the cylinder II to reciprocate through the piston rod, and the hydrogen is compressed and output through the cylinder I and the cylinder II; The block I is provided with an air path channel I connected to the buffer chamber I, the block II is provided with an air path channel II connected to the buffer chamber II, and the balancing gas tank is arranged between the air path channel I and the air path channel II; the block I is provided with a hydraulic oil recovery port I at a position where the piston rod is in contact with the block I, the block II is provided with a hydraulic oil recovery port II at a position where the piston rod is in contact with the block II, and a hydraulic oil recovery tank is connected between the hydraulic oil recovery port I and the hydraulic oil recovery port II.

3. A hydrogen compressor booster pump according to claim 1, characterized in that: The composite cylinder body comprises an outer high-strength alloy steel cylinder barrel, an inner hydrogen embrittlement-resistant ceramic barrel is sleeved in the high-strength alloy steel cylinder barrel, the outer high-strength alloy steel cylinder barrel and the inner ceramic barrel are interference fit, and the high-strength alloy steel cylinder barrel and the ceramic barrel are connected by hot and cold assembly.

4. A hydrogen compressor booster pump according to claim 3, characterized in that: The high-strength alloy steel cylinder is one of a high-strength steel cylinder, a high-strength titanium alloy cylinder, and a high-strength aluminum alloy high-strength steel cylinder; the ceramic cylinder adopts one of oxide ceramics, vanadium ceramics, carbide ceramics, boride ceramics, and nitride ceramics; the ceramic cylinder adopts one of an alumina ceramic cylinder, a zirconium oxide ceramic cylinder, a silicon carbide ceramic cylinder, a boron carbide ceramic cylinder, or a boron nitride ceramic cylinder.

5. A hydrogen compressor booster pump according to claim 1, characterized in that: The composite cylinder body comprises a single-material metal cylinder barrel, and the inside and outside of the single-material metal cylinder barrel are sprayed with a wear-resistant material layer.

6. A hydrogen compressor booster pump according to claim 1, characterized in that: The electric cylinder comprises an electric motor and a driving cylinder body which are connected to each other. The output shaft of the electric motor is in transmission connection with the driving shaft of the driving cylinder body. The driving cylinder body, the gas booster cylinder part and the transmission part are coaxially arranged. The driving shaft of the driving cylinder body is connected to the variable diameter transmission shaft.

7. A hydrogen compressor booster pump according to claim 1, characterized in that: The hydrogen compression cylinder comprises a cylinder liner, a cylinder seat, and a cooling water jacket sleeved outside the cylinder liner. The cooling water jacket is arranged outside the cylinder liner, and a water inlet and a water outlet are arranged on the cooling water jacket. Cooling water flows in the spiral cooling water jacket.

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