Gas compression pump, hydrogen compressor and hydrogen refueling station

Abstract

The invention discloses a gas compression pump, a hydrogen compressor and a hydrogen refueling station. The gas compression pump comprises a cylinder body assembly, a piston assembly and a sensing assembly. The cylinder body assembly comprises a hydraulic cylinder, a first isolation cylinder and a first air cylinder which are sequentially arranged. The piston assembly comprises a piston rod, a first piston and a second piston, wherein the first piston and the second piston are arranged on the piston rod and arranged in the hydraulic cylinder and the first air cylinder respectively. The sensing assembly comprises a first detection ring, a first sensor and a second sensor, the first detection ring is installed on the piston rod and located in the first isolation cylinder, and the first sensor and the second sensor are sequentially arranged on the first isolation cylinder at intervals in the direction from the first air cylinder to the hydraulic cylinder; the first sensor is used for controlling and reducing the oil inlet flow of the hydraulic cylinder under the condition that the first detection ring is sensed, and the second sensor is used for controlling and changing the oil inlet direction of the hydraulic cylinder under the condition that the first detection ring is sensed, so that the impact force of the first piston is reduced, and the service life of the gas compression pump is prolonged.

Description

Technical Field

[0001] This application belongs to the technical field of hydrogen compressors, and specifically relates to a gas compression pump, a hydrogen compressor, and a hydrogen refueling station. Background Art

[0002] At present, with the development of hydrogen energy, hydrogen refueling stations are being widely popularized. A hydrogen refueling station is a gas station that provides hydrogen for fuel cell vehicles. After a fuel cell vehicle has traveled, the hydrogen refueling station refuels the vehicle with hydrogen, enabling the fuel cell vehicle to travel again.

[0003] The hydrogen compressor in a hydrogen refueling station is a very important structure. The hydrogen compressor is mainly used to compress hydrogen from a storage state to a high-pressure state to meet the hydrogen refueling requirements of fuel cell vehicles. Hydrogen has a large volume under normal temperature and pressure. Compression can significantly reduce its volume, thereby improving the efficiency of storage and transportation. Different types of fuel cell vehicles and other hydrogen energy applications have different pressure requirements for hydrogen. The hydrogen compressor can compress hydrogen to an appropriate pressure level (such as 350 bar or 700 bar) to meet the hydrogen refueling requirements of these devices.

[0004] In a hydrogen compressor, hydrogen is mainly compressed by a gas compression pump. When the gas compression pump is working, the pressure in the hydraulic cylinder can reach 25 - 30 Mpa, and the piston movement speed is also relatively fast, resulting in the gas compression pump being subjected to high-pressure shocks, and the high-pressure shocks will reduce the service life of the gas compression pump. Summary of the Invention

[0005] In view of the above defects or deficiencies, this application provides a gas compression pump, a hydrogen compressor, and a hydrogen refueling station, aiming to solve the technical problem that a traditional gas compression pump is subjected to high-pressure shocks.

[0006] To achieve the above object, this application provides a gas compression pump. The gas compression pump includes a cylinder block assembly, a piston assembly, and an induction assembly. The cylinder block assembly includes a hydraulic cylinder, a first isolation cylinder, and a first cylinder arranged in sequence. The piston assembly includes a piston rod, and a first piston and a second piston provided on the piston rod. The first piston and the second piston are respectively arranged in the hydraulic cylinder and the first cylinder. The induction assembly includes a first detection ring, a first sensor, and a second sensor. The first detection ring is installed on the piston rod and is located in the first isolation cylinder. The first sensor and the second sensor are sequentially arranged on the first isolation cylinder at intervals in the direction of the first cylinder towards the hydraulic cylinder. The first sensor is used to control the reduction of the oil inlet flow of the hydraulic cylinder when it senses the first detection ring, and the second sensor is used to control the change of the oil inlet direction of the hydraulic cylinder when it senses the first detection ring.

[0007] In the technical solution of the present application, the first isolation cylinder is provided with a plurality of installation points in sequence along the direction from the first cylinder to the hydraulic cylinder, and the first sensor and the second sensor can be installed at two installation points selected from the plurality of installation points for one-to-one correspondence.

[0008] In the technical solution of the present application, the first isolation cylinder includes an isolation cylinder body and a sensor mounting plate. The isolation cylinder body is formed with a mounting port, and the isolation cylinder body is also provided with a step portion at the outer periphery of the mounting port. The sensor mounting plate is arranged on the step portion and can be adjusted along the length direction of the first isolation cylinder. A plurality of mounting points are provided on the sensor mounting plate.

[0009] In the technical solution of the present application, a mounting rod section for the first detection ring to be mounted is provided on the piston rod, one end of the mounting rod section is formed with a stop surface by reducing the diameter, and the other end of the mounting rod section is concave to form a groove for the retaining ring to be embedded, and the retaining ring can be clamped on both sides of the stop surface to mount the first detection ring.

[0010] In the technical solution of the present application, a guide sleeve for the piston rod to pass through is arranged in the hydraulic cylinder, and a buffer rod section with an enlarged diameter is arranged at a position of the piston rod close to the first piston.

[0011] In the technical solution of the present application, the gas compression pump further includes a controller which is communicatively connected to the hydraulic cylinder, the first sensor and the second sensor respectively, and the controller is configured as follows:

[0012] When the first sensor senses the first detection ring, the oil flow rate of the hydraulic cylinder is controlled to decrease by a preset value at every preset time interval;

[0013] When the second sensor senses the first detection ring, the control changes the oil inlet direction of the hydraulic cylinder.

[0014] In the technical solution of the present application, the cylinder assembly also includes a second isolation cylinder and a second air cylinder, and the first air cylinder, the first isolation cylinder, the hydraulic cylinder, the second isolation cylinder and the second cylinder are arranged in sequence; the piston assembly also includes a third piston arranged on the piston rod, and the third piston is arranged in the second cylinder; the sensing assembly also includes a second detection ring, a third sensor and a fourth sensor, the second detection ring is installed on the piston rod and is located in the second isolation cylinder, and the third sensor and the fourth sensor are arranged on the second isolation cylinder in sequence along the direction from the second cylinder to the hydraulic cylinder.

[0015] In the technical solution of the present application, the gas compression pump further comprises a sealing assembly, which is installed on a side of the first isolation cylinder close to the first cylinder;

[0016] And / or, the first isolation cylinder is provided with an air leakage passage, and the air leakage passage is connected to the first cylinder;

[0017] And / or, the first isolation cylinder is provided with an oil leakage port.

[0018] Secondly, the present application also provides a hydrogen compressor, which includes the gas compression pump as described above.

[0019] In addition, the present application also provides a hydrogen refueling station, which includes the hydrogen compressor as described above.

[0020] Through the above technical solution, the gas compression pump provided in the embodiment of the present application has the following beneficial effects:

[0021] The first isolation cylinder is located between the first cylinder and the hydraulic cylinder. The oil and gas are isolated by setting the first isolation cylinder, so that the part of the piston rod that contacts the oil will not enter the first cylinder, completely eliminating the danger of flammability and explosion after the oil and gas are mixed, and improving the reliability of the gas compression pump. The first piston is located in the hydraulic cylinder, and the second piston is located in the first cylinder. Oil enters the hydraulic cylinder, the oil pushes the first piston to move, the first piston drives the piston rod to move, and the piston rod drives the second piston to move, so that the second piston can compress the gas. The first detection ring is installed on the piston rod, and the first detection ring is located in the first isolation cylinder, and the first detection ring can reciprocate with the piston rod. In the direction from the first cylinder to the hydraulic cylinder, the first sensor and the second sensor are arranged on the first isolation cylinder in sequence. The first sensor and the second sensor are arranged on the first isolation cylinder. Compared with the traditional arrangement of sensors on the end of the first piston moving in the hydraulic cylinder, the impact caused by the direct contact between the first piston and the sensor is avoided, and the requirements for the pressure resistance performance of the sensor are reduced.

[0022] When the hydraulic cylinder is supplied with oil from the left side, the oil pushes the first piston to move to the right, the first piston drives the piston rod and the second piston to move to the right, and the gas enters the first cylinder. When the first detection ring arranged on the piston rod moves to the first sensor, the first sensor senses the signal of the first detection ring, controls the reduction of the oil flow of the hydraulic cylinder, and the piston rod enters the deceleration state, reducing the impact force of the first piston. When the first detection ring moves to the second sensor, the second sensor senses the signal of the first detection ring. At this time, the first piston moves to the right end of the hydraulic cylinder, and controls the change of the oil supply direction of the hydraulic cylinder, that is, adjusts the hydraulic cylinder to supply oil from the right side. Then, the oil pushes the first piston to move to the left, the first piston drives the piston rod and the second piston to move to the left, the second piston compresses the gas, and the first cylinder begins to discharge the compressed gas until the second piston returns to the initial position.

[0023] The present application sets a first detection ring to cooperate with a first sensor and a second sensor. When the first sensor detects the first detection ring, the oil inlet flow rate of the hydraulic cylinder is controlled to be reduced, so that the movement speed of the piston rod is reduced, the impact force of the first piston is reduced, and the service life of the gas compression pump is extended. In addition, when the second sensor detects the first detection ring, the oil inlet direction of the hydraulic cylinder is controlled to be changed so that the piston rod can be reversed in time.

[0024] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:

[0026] Figure 1 is a schematic structural diagram of a gas compression pump in one state according to an embodiment of the present application;

[0027] Figure 2 is a schematic structural diagram of a gas compression pump in another state according to an embodiment of the present application;

[0028] Figure 3 yes Figure 2 A magnified schematic diagram of the local structure;

[0029] Figure 4 yes Figure 2 The enlarged schematic diagram of point A in the middle;

[0030] Figure 5 is an enlarged schematic diagram of a partial structure of a gas compression pump in another state according to an embodiment of the present application;

[0031] Figure 6 yes Figure 2 A magnified schematic diagram of point B in the middle.

[0032] Description of Reference Numerals

[0033] 100 Gas compression pump 211 Mounting rod section

[0034] 11 Hydraulic cylinder 212 Stop surface

[0035] 111 guide sleeve 213 groove

[0036] 112 guide hole 214 retaining ring

[0037] 113 First oil inlet 215 Buffer rod section

[0038] 114 Second oil inlet 22 First piston

[0039] 12 First isolation cylinder 23 Second piston

[0040] 121 Installation point 24 Third piston

[0041] 122 Isolation cylinder body 31 First detection ring

[0042] 123 Sensor mounting plate 311 Friction ring

[0043] 124 Mounting port 32 First sensor

[0044] 125 Step 33 Second sensor

[0045] 126 air release channel 34 second detection ring

[0046] 127 Oil leakage port 35 Third sensor

[0047] 13 First cylinder 36 Fourth sensor

[0048] 14 Second isolation cylinder 40 sealing assembly

[0049] 15 Second cylinder 41 First seal

[0050] 21 Piston rod 42 Second seal DETAILED DESCRIPTION

[0051] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0052] The gas compression pump, hydrogen compressor and hydrogen refueling station of the present application are described below with reference to the accompanying drawings.

[0053] like Figures 1 to 6As shown, the present application provides a gas compression pump 100, wherein the gas compression pump 100 includes a cylinder assembly, a piston assembly and a sensing assembly. The cylinder assembly includes a hydraulic cylinder 11, a first isolation cylinder 12 and a first air cylinder 13 arranged in sequence. The piston assembly includes a piston rod 21 and a first piston 22 and a second piston 23 arranged on the piston rod 21, and the first piston 22 and the second piston 23 are respectively arranged in the hydraulic cylinder 11 and the first air cylinder 13. The sensing assembly includes a first detection ring 31, a first sensor 32 and a second sensor 33, the first detection ring 31 is installed on the piston rod 21 and is located in the first isolation cylinder 12, the first sensor 32 and the second sensor 33 are arranged in sequence on the first isolation cylinder 12 along the direction from the first air cylinder 13 to the hydraulic cylinder 11, the first sensor 32 is used to control the reduction of the oil inlet flow of the hydraulic cylinder 11 when the first detection ring 31 is sensed, and the second sensor 33 is used to control the change of the oil inlet direction of the hydraulic cylinder 11 when the first detection ring 31 is sensed.

[0054] The gas compression pump 100 in the present application is explained as hydrogen gas, but the gas in the gas compression pump 100 may also be other gases.

[0055] The first isolation cylinder 12 is located between the first cylinder 13 and the hydraulic cylinder 11. The oil and gas are isolated by setting the first isolation cylinder 12, so that the part of the piston rod 21 that contacts the oil will not enter the first cylinder 13, completely eliminating the danger of flammability and explosion after the oil and gas are mixed, and improving the reliability of the gas compression pump 100. The first piston 22 is located in the hydraulic cylinder 11, and the second piston 23 is located in the first cylinder 13. The oil enters the hydraulic cylinder 11, and the oil pushes the first piston 22 to move, the first piston 22 drives the piston rod 21 to move, and the piston rod 21 drives the second piston 23 to move, so that the second piston 23 can compress the gas. The first detection ring 31 is installed on the piston rod 21, and the first detection ring 31 is located in the first isolation cylinder 12, and the first detection ring 31 can reciprocate with the piston rod 21. In the direction from the first cylinder 13 to the hydraulic cylinder 11, the first sensor 32 and the second sensor 33 are sequentially arranged on the first isolation cylinder 12. The first sensor 32 and the second sensor 33 are arranged on the first isolation cylinder 12. Compared with the conventional arrangement of the sensor on the moving end of the first piston 22 in the hydraulic cylinder 11, the impact caused by the direct contact between the first piston 22 and the sensor is avoided, and the requirement for the pressure resistance of the sensor is reduced.

[0056] See also Figure 1When the hydraulic cylinder 11 takes in oil from the left side, the oil pushes the first piston 22 to move to the right, and the first piston 22 drives the piston rod 21 and the second piston 23 to move to the right, and the gas enters the first cylinder 13. When the first detection ring 31 arranged on the piston rod 21 moves to the first sensor 32, the first sensor 32 senses the signal of the first detection ring 31, controls the reduction of the oil flow rate of the hydraulic cylinder 11, and the piston rod 21 enters the deceleration state, reducing the impact force of the first piston 22. When the first detection ring 31 moves to the second sensor 33, the second sensor 33 senses the signal of the first detection ring 31. At this time, the first piston 22 moves to the right end of the hydraulic cylinder 11, controls the change of the oil inlet direction of the hydraulic cylinder 11, that is, adjusts the hydraulic cylinder 11 to take in oil from the right side. Then, please refer to Figure 2 The oil pushes the first piston 22 to move leftward, the first piston 22 drives the piston rod 21 and the second piston 23 to move leftward, the second piston 23 compresses the gas, and the first cylinder 13 begins to discharge the compressed gas outward until the second piston 23 returns to the initial position.

[0057] The present application sets a first detection ring 31 to cooperate with a first sensor 32 and a second sensor 33. When the first sensor 32 detects the first detection ring 31, the oil inlet flow rate of the hydraulic cylinder 11 is controlled to be reduced, so that the movement speed of the piston rod 21 is reduced, the impact force of the first piston 22 is reduced, and the service life of the gas compression pump 100 is extended. In addition, when the second sensor 33 detects the first detection ring 31, the oil inlet direction of the hydraulic cylinder 11 is controlled to be changed, so that the piston rod 21 can be reversed in time.

[0058] Specifically, the first detection ring 31 can be a metal ring, and the first sensor 32 can be a proximity switch, which is a position switch that can be operated without direct mechanical contact with the moving parts. When the metal detection body moves to the sensing area of ​​the proximity switch, the switch can quickly issue electrical instructions without contact, pressure, or sparks, accurately reflecting the position and stroke of the moving mechanism, and has the advantages of high positioning accuracy, long service life, strong ability to be used in harsh environments, and easy installation and adjustment. Exemplarily, the first sensor 32 can be a topworx go switch.

[0059] In the embodiments of this application, please refer to Figure 4 The first isolation cylinder 12 is provided with a plurality of installation points 121 in sequence along the direction from the first cylinder 13 to the hydraulic cylinder 11. The first sensor 32 and the second sensor 33 can select two installation points 121 from the plurality of installation points 121 for one-to-one installation.

[0060] The plurality of mounting points 121 are distributed along the length direction of the first cylinder 13. The first sensor 32 and the second sensor 33 can be installed at any two mounting points 121 selected from the plurality of mounting points 121, that is, the distance between the first sensor 32 and the second sensor 33 can be adjusted. The mounting points 121 of the first sensor 32 and the second sensor 33 can be flexibly adjusted according to factors such as the movement speed of the first piston 22, thereby changing the deceleration distance of the first piston 22, making the use of the first sensor 32 and the second sensor 33 more flexible and convenient. When the distance between the first sensor 32 and the second sensor 33 is large, the deceleration time of the first piston 22 is long and the deceleration amount is large; when the distance between the first sensor 32 and the second sensor 33 is small, the deceleration time of the first piston 22 is short and the deceleration amount is small.

[0061] In other embodiments, Figure 4 As shown, four installation points 121 are taken as an example, and a sensor is installed in each installation point 121. According to factors such as the movement speed of the first piston 22, any two of the sensors can be selected as the first sensor 32 and the second sensor 33, thereby eliminating the time for adjusting the positions of the first sensor 32 and the second sensor 33, making the use of the first sensor 32 and the second sensor 33 more convenient.

[0062] In the embodiments of this application, please continue to refer to Figure 4 The first isolation cylinder 12 includes an isolation cylinder body 122 and a sensor mounting plate 123. The isolation cylinder body 122 is formed with a mounting port 124, and the isolation cylinder body 122 is also provided with a step portion 125 at the outer periphery of the mounting port 124. The sensor mounting plate 123 is arranged on the step portion 125 and can be adjusted in position along the length direction of the first isolation cylinder 12. A plurality of mounting points 121 are provided on the sensor mounting plate 123.

[0063] The mounting opening 124 extends radially along the isolation cylinder body 122, and the step portion 125 is located at the outer periphery of the mounting opening 124. The sensor mounting plate 123 is arranged on the step portion 125, and the step portion 125 is used to support and fix the sensor mounting plate 123. A plurality of mounting points 121 are arranged on the sensor mounting plate 123, and the position of the sensor mounting plate 123 can be adjusted along the length direction of the first isolation cylinder 12. By adjusting the position of the sensor mounting plate 123 along the length direction of the first isolation cylinder 12, the positions of the first sensor 32 and the second sensor 33 on the sensor mounting plate 123 can be changed, thereby adjusting the time when the first piston 22 enters the deceleration state, making the use of the first sensor 32 and the second sensor 33 more flexible and convenient.

[0064] Furthermore, by providing the mounting port 124, there is no barrier of the isolation cylinder body 122 between the first sensor 32 and the second sensor 33 and the first detection ring 31, so that the first sensor 32 and the second sensor 33 can receive the signal of the first detection ring 31 more accurately and timely, thereby improving the control accuracy.

[0065] The dimension of the sensor mounting plate 123 along the length direction is smaller than the dimension of the step portion 125 along the length direction, so that the position of the sensor mounting plate 123 can be adjusted on the step portion 125. The step portion 125 can be provided with a plurality of fixing holes, and the sensor mounting plate 123 can be detachably connected to any fixing hole by a fastener, so that the position of the sensor mounting plate 123 can be fixed after adjustment. The fastener can be a bolt or a rivet.

[0066] In the embodiments of this application, please continue to refer to Figure 4 The piston rod 21 is provided with a mounting rod section 211 for the first detection ring 31 to be mounted on. One end of the mounting rod section 211 is formed with a stop surface 212 by reducing the diameter. The other end of the mounting rod section 211 is concave to form a groove 213 for the retaining ring 214 to be embedded. The retaining ring 214 can clamp the first detection ring 31 on both sides of the stop surface 212.

[0067] The first detection ring 31 is sleeved on the mounting rod section 211, and the right end of the mounting rod section 211 is formed with a stop surface 212 by changing the diameter, that is, the diameter of the right end of the mounting rod section 211 gradually increases from left to right to form the stop surface 212. The stop surface 212 is located on the right side of the first detection ring 31, and the stop surface 212 is used to limit the first detection ring 31 from moving to the right. The left end of the mounting rod section 211 is recessed inward to form a groove 213, and the retaining ring 214 is embedded and installed in the groove 213, and the groove 213 is used to limit the retaining ring 214. The retaining ring 214 is located on the left side of the first detection ring 31, and the retaining ring 214 is used to limit the first detection ring 31 from moving to the left. The retaining ring 214 can cooperate with the stop surface 212 to clamp the first detection ring 31 from the left and right sides, limit the first detection ring 31, so that the position of the first detection ring 31 is fixed, and the accuracy of the first detection ring 31 and the first sensor 32 and the second sensor 33 is improved.

[0068] Specifically, there is a certain installation gap between the retaining ring 214 and the groove wall of the groove 213. In order to further prevent the first detection ring 31 from shaking, a friction ring 311 is provided at the bottom of the first detection ring 31 to increase the friction between the first detection ring 31 and the piston rod 21 to prevent the first detection ring 31 from shaking, thereby further improving the accuracy of the first detection ring 31 with the first sensor 32 and the second sensor 33.

[0069] In the embodiments of this application, please refer to Figure 5A guide sleeve 111 is provided in the hydraulic cylinder 11 for the piston rod 21 to pass through. The piston rod 21 is provided with a buffer rod section 215 with an enlarged diameter at a position close to the first piston 22 .

[0070] The guide sleeve 111 is arranged in the hydraulic cylinder 11. The guide sleeve 111 is provided with a guide hole 112. The piston rod 21 can slide through the guide hole 112. The movement of the piston rod 21 is guided by the guide sleeve 111, so that the piston rod 21 can reciprocate more stably and reliably. The piston rod 21 is provided with a buffer rod section 215 at a position close to the first piston 22. The buffer rod section 215 is arranged with an enlarged diameter, that is, the diameter of the buffer rod section 215 is increased. When the piston rod 21 moves to the point where the buffer rod section 215 is about to enter the guide hole 112, the diameter of the buffer rod section 215 is increased, and the gap between the piston rod 21 and the hole wall of the guide hole 112 becomes smaller, so that buffering can be performed, so that the speed of the piston rod 21 is further reduced, reducing the impact.

[0071] Specifically, a softer material may be used to melt-coat the piston rod 21 to form the buffer rod section 215, or the guide sleeve 111 may be made of a softer material, such as ductile iron.

[0072] The piston rods 21 on both sides of the first piston 22 may be provided with buffer rod sections 215 , and the hydraulic cylinder 11 is correspondingly provided with two guide sleeves 111 , so as to buffer the leftward and rightward movements of the piston rod 21 , and further reduce the impact.

[0073] In other embodiments, buffering may also be performed by providing a throttle valve or a buffer ring.

[0074] In the embodiment of the present application, the gas compression pump 100 further includes a controller which is respectively connected to the hydraulic cylinder 11, the first sensor 32 and the second sensor 33 for communication, and the controller is configured as follows:

[0075] When the first sensor 32 senses the first detection ring 31, the oil flow rate of the hydraulic cylinder 11 is controlled to decrease by a preset value at every preset time interval;

[0076] When the second sensor 33 senses the first detection ring 31 , the oil inlet direction of the hydraulic cylinder 11 is changed.

[0077] The controller is respectively connected to the hydraulic cylinder 11, the first sensor 32 and the second sensor 33 for communication, and the controller can control the hydraulic cylinder 11 according to the signals of the first sensor 32 and the second sensor 33. When the first sensor 32 senses the first detection ring 31, the oil inlet flow of the hydraulic cylinder 11 is controlled to be reduced by a preset value at every preset time interval, so that the oil inlet flow of the hydraulic cylinder 11 is gradually reduced, and the movement speed of the piston rod 21 is gradually reduced, thereby reducing the impact force. When the second sensor 33 senses the first detection ring 31, the oil inlet direction of the hydraulic cylinder 11 is controlled to be changed, so that the piston rod 21 can be reversed in time.

[0078] In the embodiments of this application, please refer to Figure 1 and Figure 2 The cylinder assembly also includes a second isolation cylinder 14 and a second cylinder 15, and the first cylinder 13, the first isolation cylinder 12, the hydraulic cylinder 11, the second isolation cylinder 14 and the second cylinder 15 are arranged in sequence; the piston assembly also includes a third piston 24 arranged on the piston rod 21, and the third piston 24 is arranged in the second cylinder 15; the sensing assembly also includes a second detection ring 34, a third sensor 35 and a fourth sensor 36, the second detection ring 34 is installed on the piston rod 21 and is located in the second isolation cylinder 14, and the third sensor 35 and the fourth sensor 36 are arranged on the second isolation cylinder 14 in sequence along the direction from the second cylinder 15 to the hydraulic cylinder 11.

[0079] The first cylinder 13 is isolated from the hydraulic cylinder 11 by the first isolation cylinder 12, and the second cylinder 15 is isolated from the hydraulic cylinder 11 by the second isolation cylinder 14. The second piston 23 and the third piston 24 are respectively arranged in the first cylinder 13 and the second cylinder 15. The second detection ring 34 is installed on the piston rod 21, and the second detection ring 34 is located in the second isolation cylinder 14, and the second detection ring 34 can reciprocate with the piston rod 21. In the direction from the second cylinder 15 to the hydraulic cylinder 11, the third sensor 35 and the fourth sensor 36 are arranged on the second isolation cylinder 14 in sequence. The third sensor 35 is symmetrically arranged with the first sensor 32, and the working mechanism of the third sensor 35 is consistent with that of the first sensor 32. The fourth sensor 36 is symmetrically arranged with the second sensor 33, and the working mechanism of the fourth sensor 36 is consistent with that of the second sensor 33.

[0080] The hydraulic cylinder 11 has a first oil inlet 113 and a second oil inlet 114. Figure 1When the hydraulic cylinder 11 takes in oil from the first oil inlet 113 on the left side, the oil pushes the first piston 22 to move to the right, and the first piston 22 drives the piston rod 21 to move to the right, and the gas enters the first cylinder 13. The gas in the second cylinder 15 is compressed by the third piston 24 and discharged outward. When the first detection ring 31 arranged on the piston rod 21 moves to the first sensor 32, the first sensor 32 senses the signal of the first detection ring 31, controls the reduction of the oil inlet flow of the hydraulic cylinder 11, and the piston rod 21 enters the deceleration state, reducing the impact force of the first piston 22. When the first detection ring 31 moves to the second sensor 33, the second sensor 33 senses the signal of the first detection ring 31. At this time, the first piston 22 moves to the right end of the hydraulic cylinder 11, controls the change of the oil inlet direction of the hydraulic cylinder 11, that is, adjusts the hydraulic cylinder 11 to take in oil from the second oil inlet 114 on the right side. Then, please refer to Figure 2 , the oil pushes the first piston 22 to move to the left, the first piston 22 drives the piston rod 21 to move to the left, the second piston 23 compresses the gas, and the first cylinder 13 begins to discharge the compressed gas outward, and at the same time, the gas enters the second cylinder 15. When the second detection ring 34 arranged on the piston rod 21 moves to the third sensor 35, the third sensor 35 senses the signal of the second detection ring 34, controls to reduce the oil flow rate of the hydraulic cylinder 11, and the piston rod 21 enters the deceleration state, reducing the impact force of the first piston 22. When the second detection ring 34 moves to the fourth sensor 36, the fourth sensor 36 senses the signal of the second detection ring 34. At this time, the first piston 22 moves to the left end of the hydraulic cylinder 11, controls to change the oil inlet direction of the hydraulic cylinder 11, that is, adjusts the hydraulic cylinder 11 to inlet oil from the first oil inlet 113 on the left side, and repeats this cycle.

[0081] By providing the first cylinder 13 and the second cylinder 15 , the efficiency of the gas compression pump 100 in compressing gas is improved, thereby improving the working efficiency of the gas compression pump 100 .

[0082] In the embodiments of this application, please refer to Figure 6 The gas compression pump 100 further includes a sealing assembly 40, which is installed on a side of the first isolation cylinder 12 close to the first cylinder 13. The sealing assembly 40 is provided to prevent the gas in the cylinder from entering the first isolation cylinder 12 and contacting the oil, thereby further improving the reliability of the gas compression pump 100.

[0083] The sealing assembly 40 includes a first sealing member 41 and a second sealing member 42 . The first sealing member 41 and the second sealing member 42 are distributed along the length direction of the first isolation cylinder 12 . The first sealing member 41 and the second sealing member 42 are provided for double sealing, thereby improving the sealing reliability of the sealing assembly 40 .

[0084] The first seal 41 and the second seal 42 can be a step seal and a Gly ring respectively, and are made of low friction materials, such as ultra-high molecular weight polyethylene and PTFE-filled polymer. The use of low friction materials can greatly increase the service life of the sealing assembly 40 and reduce the processing requirements of the piston rod 21.

[0085] In the embodiments of this application, please continue to refer to Figure 6 The first isolation cylinder 12 is provided with a gas leakage channel 126, which is connected to the first cylinder 13. The gas leakage channel 126 is provided to collect hydrogen leaked due to sealing failure of the second piston 23 or other situations, thereby ensuring the isolation of hydrogen and detecting the internal hydrogen leakage.

[0086] In the embodiments of this application, please refer to Figure 3 The first isolation cylinder 12 is provided with an oil leakage port 127. The oil on the piston rod 21 and the leaked oil are collected by providing the oil leakage port 127, so that the use of the gas compression pump 100 is more convenient.

[0087] The main working process of the gas compressor in this application is as follows (taking one cycle of the first cylinder 13 as an example):

[0088] like Figure 1 As shown, when the oil enters from the first oil inlet 113, the piston rod 21 moves to the right end as a whole, and the first cylinder 13 begins to enter hydrogen. When the first detection ring 31 arranged on the piston rod 21 moves to the first sensor 32, the first sensor 32 receives a signal and begins to adjust the oil inlet flow rate of the hydraulic cylinder 11. At this time, since the oil inlet flow rate begins to decrease, the piston rod 21 begins to enter the deceleration state. When the piston rod 21 moves to the right buffer rod section 215 and is about to enter the guide hole 112, the return oil diameter of the guide sleeve 111 is further reduced, and the piston rod 21 enters the secondary deceleration. When the piston rod 21 slowly moves to fit with the guide sleeve 111, the first detection ring 31 just moves to the position below the second sensor 33, and the first oil inlet 113 is completely closed and starts to reverse (at this time, the part of the piston rod 21 contaminated with oil is completely in the atmospheric environment position of the second isolation cylinder 14 and will not enter the second cylinder 15, as shown in FIG. Figure 2 Then, oil begins to enter from the second oil inlet 114, and the oil drives the piston rod 21 and pushes the second piston 23 to move to the left, and begins to discharge hydrogen. Similar to the first cylinder 13, when the second detection ring 34 arranged on the piston rod 21 moves to the position of the third sensor 35, the third sensor 35 receives a signal and begins to adjust the oil flow rate of the hydraulic cylinder 11. At this time, since the oil flow rate begins to decrease, the piston rod 21 begins to enter the deceleration state. When the piston rod 21 moves to the buffer rod section 215 on the left side and is about to enter the guide hole 112 (as shown in FIG. 1 ), the piston rod 21 begins to enter the deceleration state. Figure 5The oil return diameter of the guide sleeve 111 is further reduced, and the piston rod 21 enters the secondary deceleration. When the piston rod 21 slowly moves to fit with the guide sleeve 111, the second detection ring 34 just moves to the position of the fourth sensor 36, and the second oil inlet 114 is completely closed, and the direction is reversed again (the part of the piston rod 21 contaminated with oil is completely in the atmospheric environment position of the first isolation cylinder 12 and will not enter the first cylinder 13, such as Figure 1 This process is repeated to complete the hydrogen compression process.

[0089] The sensor mounting plate 123 is mounted on the step portion 125 of the first isolation cylinder 12, and can be fine-tuned in a local range. In addition, a plurality of mounting points 121 can be provided on the sensor mounting plate 123 to achieve step-adjustable deceleration distance.

[0090] By providing the first isolation cylinder 12 and the second isolation cylinder 14, the oil and gas are isolated, the reliability of the gas compression pump 100 is improved, and the impact of the gas compression pump 100 during operation is reduced by two-stage deceleration. In addition, the low-friction sealing assembly 40 is provided, which greatly improves the service life of the sealing assembly 40 and reduces the processing requirements of the piston rod 21.

[0091] The effects of this application include:

[0092] 1. By providing the first isolation cylinder 12 and the second isolation cylinder 14, the portion of the piston rod 21 that contacts the oil will not enter the first cylinder 13 and the second cylinder 15 at all, thus completely eliminating the danger of inflammability and explosion after the oil and hydrogen are mixed; and the leaked oil and leaked hydrogen can be collected through the oil leakage port 127 and the air leakage channel 126.

[0093] 2. The sensors are arranged on the first isolation cylinder 12 and the second isolation cylinder 14, which reduces the requirements for the pressure resistance of the sensors. Four installation points 121 are set on the sensor mounting plate 123, and two sensors can be arranged on a single side. The oil flow rate is controlled by the signals of the front and rear sensors, and the distance gradient between the sensors is adjustable, so the buffer time can be adjusted. Due to the outward movement of the sensors, the hydraulic cylinder 11 does not need to consider the high pressure resistance of the sensors. The gap between the piston rod 21 and the guide sleeve 111 can be controlled by the gap between the two parts, thereby achieving a buffering effect and further reducing the switching impact.

[0094] 3. By providing the first isolation cylinder 12 and the second isolation cylinder 14, the sealing assembly 40 only needs to bear the role of sealing the leaked hydrogen. The gap between the first isolation cylinder 12 and the second isolation cylinder 14 and the piston rod 21 can be appropriately enlarged, reducing the requirement for the straightness of the piston rod 21. At the same time, the sealing assembly 40 improves the overall reliability and the life of the sealing by providing two low-friction sealing components.

[0095] 4. By arranging the first detection ring 31 and the second detection ring 34 on the piston rod 21, the reliability of the sensing component in identifying the piston rod 21 is improved.

[0096] The present application improves the reliability and life of the gas compression pump 100 through structural settings, reduces switching shock, greatly reduces the requirements for component processing accuracy, and further reduces production costs.

[0097] Secondly, the present application also provides a hydrogen compressor, which includes the above-mentioned gas compression pump 100. Since the hydrogen compressor adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0098] In addition, the present application also provides a hydrogenation station, which includes the above-mentioned gas compression pump 100. Since the hydrogenation station adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0099] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0100] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0101] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0102] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A gas compression pump, characterized in that: The gas compression pump comprises: A cylinder assembly comprises a hydraulic cylinder (11), a first isolation cylinder (12) and a first air cylinder (13) which are arranged in sequence; A piston assembly comprises a piston rod (21) and a first piston (22) and a second piston (23) arranged on the piston rod (21), wherein the first piston (22) and the second piston (23) are respectively arranged in the hydraulic cylinder (11) and the first air cylinder (13); The sensing component comprises a first detection ring (31), a first sensor (32) and a second sensor (33); the first detection ring (31) is mounted on the piston rod (21) and is located in the first isolation cylinder (12); the first sensor (32) and the second sensor (33) are sequentially arranged on the first isolation cylinder (12) in a direction from the first cylinder (13) toward the hydraulic cylinder (11) at intervals; the first sensor (32) is used to control the reduction of the oil inlet flow rate of the hydraulic cylinder (11) when the first detection ring (31) is sensed; and the second sensor (33) is used to control the change of the oil inlet direction of the hydraulic cylinder (11) when the first detection ring (31) is sensed.

2. The gas compression pump according to claim 1, characterized in that: The first isolation cylinder (12) is provided with a plurality of installation points (121) in sequence along the direction from the first air cylinder (13) toward the hydraulic cylinder (11), and the first sensor (32) and the second sensor (33) can be installed at two of the plurality of installation points (121) selected for one-to-one correspondence.

3. The gas compression pump according to claim 2, characterized in that: The first isolation cylinder (12) comprises an isolation cylinder body (122) and a sensor mounting plate (123); the isolation cylinder body (122) is formed with a mounting opening (124), and the isolation cylinder body (122) is also provided with a step portion (125) on the outer periphery of the mounting opening (124); the sensor mounting plate (123) is arranged on the step portion (125) and can be adjusted in position along the length direction of the first isolation cylinder (12); and a plurality of mounting points (121) are provided on the sensor mounting plate (123).

4. The gas compression pump according to claim 1, characterized in that: The piston rod (21) is provided with a mounting rod section (211) for the first detection ring (31) to be sleeved, one end of the mounting rod section (211) is formed with a stop surface (212) by reducing the diameter, and the other end of the mounting rod section (211) is concavely formed with a groove (213) for the retaining ring (214) to be embedded, and the retaining ring (214) can clamp the first detection ring (31) on both sides of the stop surface (212).

5. The gas compression pump according to any one of claims 1 to 4, characterized in that: A guide sleeve (111) for the piston rod (21) to pass through is arranged in the hydraulic cylinder (11), and a buffer rod section (215) with an enlarged diameter is arranged on the piston rod (21) at a position close to the first piston (22).

6. The gas compression pump according to any one of claims 1 to 4, characterized in that: The gas compression pump (100) further comprises a controller which is communicatively connected to the hydraulic cylinder (11), the first sensor (32) and the second sensor (33) respectively, and the controller is configured as follows: When the first sensor (32) senses the first detection ring (31), the oil inlet flow rate of the hydraulic cylinder (11) is controlled to decrease by a preset value at every preset time interval; When the second sensor (33) senses the first detection ring (31), the oil inlet direction of the hydraulic cylinder (11) is controlled to be changed.

7. The gas compression pump according to any one of claims 1 to 4, characterized in that: The cylinder assembly further comprises a second isolation cylinder (14) and a second air cylinder (15), wherein the first air cylinder (13), the first isolation cylinder (12), the hydraulic cylinder (11), the second isolation cylinder (14) and the second air cylinder (15) are arranged in sequence; the piston assembly further comprises a third piston (24) arranged on the piston rod (21), wherein the third piston (24) is arranged in the second air cylinder (15); the sensing assembly further comprises a second detection ring (34), a third sensor (35) and a fourth sensor (36), wherein the second detection ring (34) is mounted on the piston rod (21) and is located in the second isolation cylinder (14), and the third sensor (35) and the fourth sensor (36) are arranged in sequence on the second isolation cylinder (14) at intervals in a direction from the second air cylinder (15) toward the hydraulic cylinder (11).

8. The gas compression pump according to any one of claims 1 to 4, characterized in that: The gas compression pump (100) further comprises a sealing assembly (40), wherein the sealing assembly (40) is installed on a side of the first isolation cylinder (12) close to the first cylinder (13); And / or, the first isolation cylinder (12) is provided with an air leakage channel (126), and the air leakage channel (126) is connected to the first cylinder (13); And / or, the first isolation cylinder (12) is provided with an oil leakage port (127).

9. A hydrogen compressor, characterized in that: The hydrogen compressor comprises a gas compression pump according to any one of claims 1 to 8.

10. A hydrogen refueling station, characterized in that: The hydrogen refueling station comprises the hydrogen compressor according to claim 9.

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