Gas source refilling module, gas source refilling system and gas source refilling method thereof

Abstract

The application relates to a gas source filling module, a gas source filling system and a gas source filling method, which are used for making a gas source leave a gas cylinder, and the gas source filling module comprises: a bidirectional booster pump which comprises a first hydraulic medium port, a second hydraulic medium port and a switching valve; when the switching valve is in a first state, hydraulic medium flowing into the second hydraulic medium port is pressurized and discharged from the first hydraulic medium port; when the switching valve is in a second state, hydraulic medium flowing into the first hydraulic medium port is pressurized and discharged from the second hydraulic medium port; and when the switching valve is in a third state, the bidirectional booster pump does not work; the inlets of two gas-liquid separation tanks are respectively communicated with the first and second hydraulic medium ports of the bidirectional booster pump through hydraulic pipelines; the outlets of the two gas-liquid separation tanks are respectively connected to two filling ports through hydraulic pipelines; and the flow port of a high-pressure hydraulic medium tank is communicated with any gas-liquid separation tank through a hydraulic pipeline of a first controlled valve. The gas source filling module reduces gas loss and improves the cleanliness of the hydraulic medium.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fuel filling, and particularly relates to a gas source filling module, a gas source filling system and a gas source filling method thereof. BACKGROUND

[0002] At present, hydrogen, natural gas and the like are increasingly used in the transportation field as a clean energy. In order to fill the hydrogen, natural gas vehicle with fuel, a special fuel delivery system is needed.

[0003] In the existing hydrogen hydraulic hydrogen filling system, a gas storage module for storing hydrogen and a gas source filling module for making hydrogen leave the gas storage module are generally included. When hydrogen needs to be filled, the gas source filling module fills the pressurized hydraulic medium into the gas storage module to replace the hydrogen stored therein. The pressurized hydraulic medium returns to the normal pressure hydraulic medium tank after each replacement of hydrogen is completed, and then the hydraulic medium is pressurized to a high pressure state from the normal pressure hydraulic medium tank.

[0004] Therefore, in the process of changing from high pressure to normal pressure, the hydraulic medium contacts the air in the normal pressure, which pollutes the hydraulic medium and affects the cleanliness of the hydrogen medium. SUMMARY

[0005] The purpose of the present application is to provide a gas source filling module, a gas source filling system and a gas source filling method, which improve the energy utilization rate, reduce gas loss and improve the cleanliness of the hydraulic medium.

[0006] The first aspect of the present application discloses a gas source filling module for making a gas source leave a gas cylinder, comprising:

[0007] The bidirectional booster pump comprises a first hydraulic medium port, a second hydraulic medium port and a switching valve, the switching valve comprises at least three states, the switching valve pressurizes the hydraulic medium flowing into the second hydraulic medium port and discharges it from the first hydraulic medium port in the first state, the switching valve pressurizes the hydraulic medium flowing into the first hydraulic medium port and discharges it from the second hydraulic medium port in the second state, and the switching valve does not work in the third state;

[0008] The two gas-liquid separation tanks are respectively a first gas-liquid separation tank and a second gas-liquid separation tank, each of the gas-liquid separation tanks comprises an inlet and an outlet for the hydraulic medium, the inlet and the outlet are interchangeable, the inlets of the two gas-liquid separation tanks are respectively communicated with the first and second hydraulic medium ports of the bidirectional booster pump through hydraulic pipelines, and the outlets of the two gas-liquid separation tanks are respectively connected to two filling ports through hydraulic pipelines; the first gas-liquid separation tank and the second gas-liquid separation tank are connected by a bypass pipeline;

[0009] at least one high-pressure hydraulic medium tank for storing high-pressure hydraulic medium and having a flow-through opening for the hydraulic medium to enter or exit, the flow-through opening being connected to the first hydraulic medium opening or the second hydraulic medium opening via a hydraulic pipeline with a first controllable valve, wherein

[0010] when the first controllable valve is in a closed state, the high-pressure hydraulic medium tank is in a closed state; when the first controllable valve is in an open state, the hydraulic medium can be transported to the first hydraulic medium opening or the second hydraulic medium opening via the flow-through opening;

[0011] the gas source filling module further comprises:

[0012] a normal-pressure hydraulic medium tank connected to the high-pressure hydraulic medium tank via a hydraulic pipeline; a one-way valve is arranged on the hydraulic pipeline between the normal-pressure hydraulic medium tank and the high-pressure hydraulic medium tank, so that the hydraulic medium can only flow from the normal-pressure hydraulic medium tank to the high-pressure hydraulic medium tank;

[0013] a pressurizing pump arranged on the hydraulic pipeline between the normal-pressure hydraulic medium tank and the high-pressure hydraulic medium tank.

[0014] In an exemplary embodiment of the present application, the bidirectional pressurizing pump is a closed pump, which comprises a swash plate controlled by the switching valve, so that the swash plate is switched between a first position, a second position and an intermediate position between the first position and the second position, wherein,

[0015] the greater the angle between the swash plate and the intermediate position, the greater the flow rate of the hydraulic medium discharged from the first hydraulic medium opening or the second hydraulic medium opening.

[0016] In an exemplary embodiment of the present application, a second controllable valve is arranged on the bypass pipeline, a third controllable valve is arranged on the hydraulic pipeline between the first gas-liquid separation tank and the first hydraulic medium opening, and a fourth controllable valve is arranged on the hydraulic pipeline between the second gas-liquid separation tank and the second hydraulic medium opening.

[0017] In an exemplary embodiment of the present application, a first liquid level detection meter is arranged in the high-pressure hydraulic medium tank, the first liquid level detection meter is in communication connection with a control unit, when the first liquid level detection meter detects that the liquid level in the high-pressure hydraulic medium tank is lower than a preset value, the first controllable valve is closed, and the high-pressure hydraulic medium is repeatedly circulated in the hydraulic pipeline under the control of the bidirectional pressurizing pump and alternately flows into or flows out of the two filling openings.

[0018] In an exemplary embodiment of the present application, a second liquid level detection meter is arranged in each of the two gas-liquid separation tanks, the second liquid level detection meter is in communication connection with the control unit,

[0019] The bidirectional booster pump switches the working state of the bidirectional booster pump according to the detection result of the second liquid level detector.

[0020] The second aspect of the present application discloses a gas source filling system, comprising the above-mentioned gas source filling module, further comprising: a gas storage module,

[0021] The gas storage module comprises: a first gas cylinder group and a second gas cylinder group, each gas cylinder group comprising a plurality of gas cylinders for storing gas sources connected in parallel with each other, the gas cylinder comprising: an exhaust port for the gas source to discharge and an injection and return port for the hydraulic medium to inject and return, the injection and return ports of the gas cylinders of each gas cylinder group being connected to a total injection and return port through a hydraulic pipeline with a controlled valve;

[0022] The total injection and return ports of each gas cylinder group are respectively connected to the two injection ports of the gas source filling module through a detachable interface.

[0023] In an exemplary embodiment of the present application, a control unit is further included,

[0024] The control unit controls the first controlled valve to close when the liquid level of the high-pressure hydraulic medium tank drops to a preset value, so that the gas storage module, the two gas-liquid separation tanks, the bidirectional booster pump, the hydraulic pipeline connecting the gas storage module and the gas-liquid separation tank, and the hydraulic pipeline connecting the gas-liquid separation tank and the bidirectional booster pump together constitute a closed loop passage for the closed loop circulation of the high-pressure hydraulic medium,

[0025] The control unit further comprises a gas cylinder exhaust monitoring module, when the gas cylinder exhaust monitoring module detects that the last gas cylinder has completed exhaust, the control unit controls the first controlled valve to open, so that the high-pressure hydraulic medium returns to the high-pressure hydraulic medium tank through the hydraulic pipeline.

[0026] The third aspect of the present application discloses a gas source filling method of the above-mentioned gas source filling system, comprising the following steps:

[0027] One of the gas cylinders of the first gas cylinder group is connected to the first gas-liquid separation tank;

[0028] The switching valve is switched to the first state or the third state, and the high-pressure hydraulic medium is injected into one of the gas cylinders of the first gas cylinder group along the positive direction through the hydraulic pipeline and the first gas-liquid separation tank, so that the gas source in it is discharged outward;

[0029] After the exhaust of one of the gas cylinders of the first gas cylinder group is completed, one of the gas cylinders of the second gas cylinder group is connected to the second gas-liquid separation tank;

[0030] Switching the switching valve to the second state or the third state, and flowing the high-pressure hydraulic medium reversely from the gas cylinders of the first gas cylinder group to the first gas-liquid separation tank, and simultaneously, injecting the high-pressure hydraulic medium into one of the gas cylinders of the second gas cylinder group through the hydraulic pipeline and the second gas-liquid separation tank, so that the gas source in the gas cylinder is discharged outward;

[0031] Repeating the above steps, and alternately discharging the gas source in the gas cylinders of the two gas cylinder groups of the gas storage module outward.

[0032] In an exemplary embodiment of the present application, after the first gas cylinder is completed to discharge the gas outward until the high-pressure hydraulic medium in the last gas cylinder is discharged, the first controlled valve is closed, and the gas storage module, the two gas-liquid separation tanks, the bidirectional booster pump, the hydraulic pipeline connecting the gas storage module and the gas-liquid separation tank, and the hydraulic pipeline connecting the gas-liquid separation tank and the bidirectional booster pump jointly form a closed loop passage for the closed loop circulation of the high-pressure hydraulic medium, so that the high-pressure hydraulic medium only flows in the closed loop passage.

[0033] In an exemplary embodiment of the present application, when the high-pressure hydraulic medium is first injected into one of the gas cylinders of the first gas cylinder group or one of the gas cylinders of the second gas cylinder group:

[0034] The high-pressure hydraulic medium in the high-pressure hydraulic medium tank is injected into the corresponding gas cylinder through the hydraulic pipeline, and does not pass through the bidirectional booster pump.

[0035] In an exemplary embodiment of the present application, when the high-pressure hydraulic medium injection of the last gas cylinder of the gas storage module is completed, and the gas source in the last gas cylinder is discharged outward to a preset value:

[0036] The flow path of the high-pressure hydraulic medium between the last gas cylinder and the high-pressure hydraulic medium tank is connected, and the switching valve is switched to the first state or the second state, so that the high-pressure hydraulic medium in the last gas cylinder is flowed reversely to the high-pressure hydraulic medium tank through the first hydraulic medium port or the second hydraulic medium port.

[0037] In an exemplary embodiment of the present application, after the switching valve is switched to the second state or the first state, if the pressure of the hydraulic pipeline for the reversely flowed high-pressure hydraulic medium is greater than the pressure of the hydraulic pipeline for the injected high-pressure hydraulic medium, at least part of the high-pressure hydraulic medium is bypassed around the bidirectional booster pump and directly injected from the hydraulic pipeline for the reversely flowed high-pressure hydraulic medium into the corresponding hydraulic pipeline for the injected high-pressure hydraulic medium through the bypass pipeline.

[0038] The present application has the following beneficial effects:

[0039] The gas source filling module of the present application can store high-pressure hydraulic medium, so that when the gas source is completed, the high-pressure hydraulic medium used to replace the gas source can return to the high-pressure hydraulic medium tank through the flow port of the high-pressure hydraulic medium tank, without returning to the normal-pressure hydraulic medium tank providing normal-pressure hydraulic medium, avoiding the heat generated when the high-pressure hydraulic medium is converted into normal-pressure hydraulic medium, thereby facilitating the normal operation of the gas source filling module.

[0040] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0041] The drawings incorporated into the specification and forming part of the specification, show embodiments consistent with the present application, and together with the specification, serve to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained from these drawings without creative labor for those skilled in the art.

[0042] Figure 1 The structural schematic diagram of the gas source filling system described in the present application is shown;

[0043] Figure 2 The flowchart of steps S1-S6 of the gas source filling method of the gas source filling system described in the present application is shown.

[0044] Explanation of reference signs:

[0045] 100, gas source filling module; 111, bidirectional booster pump; 111a, first hydraulic medium port; 111b, second hydraulic medium port; 112, first gas-liquid separation tank; 113, second gas-liquid separation tank; 114, high-pressure hydraulic medium tank; 115, switching valve; 116, hydraulic pipeline; 117, first liquid level detector; 118, second liquid level detector; 119, first controlled valve; 120, second controlled valve; 121, third controlled valve; 122, fourth controlled valve; 123, one-way valve; 124, overpressure overflow valve; 125, pressure pump; 126, normal-pressure hydraulic medium tank; 127, bypass pipeline; 128, pressure transmitter; 129, temperature transmitter;

[0046] 200, gas storage module; 210, first gas cylinder group; 220, second gas cylinder group; 230, gas cylinder; 240, filling return port; 250, exhaust port; 260, total filling return port. DETAILED DESCRIPTION

[0047] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example implementations to those skilled in the art.

[0048] Moreover, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the

[0049] The application is further described in detail by way of specific embodiments in conjunction with the attached drawings. It is to be understood that the drawings are designed solely for the purpose of illustration and description and are not intended to limit the scope of the application.

[0050] Gas source filling system

[0051] As shown in Figure 1 and Figure 2 The gas source filling system according to the embodiments of the present application comprises a gas source filling module 100 and a gas storage module 200.

[0052] In the embodiments, the gas storage module 200 comprises a first group of gas cylinders 210 and a second group of gas cylinders 220, each of the groups of gas cylinders 210, 220 comprises a plurality of gas cylinders 230 connected in parallel to each other for storing gas source, each of the gas cylinders 230 comprises an exhaust port 250 for discharging gas source and an injection and return port 240 for injecting and returning hydraulic medium, the injection and return ports 240 of the gas cylinders 230 of each of the groups of gas cylinders 230 are connected to each other through hydraulic pipes 116 with controlled valves and converge to a total injection and return port 260, and the total injection and return ports 260 of each of the groups of gas cylinders 230 are respectively connected to two injection ports of the gas source filling module 100 through detachable docking interfaces.

[0053] In the embodiments, the hydraulic medium is not reactive with the gas source and is a medium incompatible with the gas source.

[0054] It should be understood that if the first gas cylinder 230 in the first gas cylinder group 210 in the gas storage module 200 is first vented, the controlled valve corresponding to the backfill port 240 of the first gas cylinder 230 is first opened to allow the backfill port 240 to communicate with the total backfill port 260, and then the high-pressure hydraulic medium used for venting is injected into the corresponding total backfill port 260 through the filling port of the gas source filling module 100 until the high-pressure hydraulic medium enters the gas cylinder 230 being vented, and the replacement of the gas source is completed. After the venting of the gas source in the first gas cylinder 230 in the first gas cylinder group 210 is completed, the gas cylinder 230 in the first gas cylinder group 210 is subjected to a high-pressure hydraulic medium backflow operation by the gas source filling module 100 to flow the high-pressure hydraulic medium in the gas cylinder 230 of the first gas cylinder group 210 to another total backfill port 260, and finally injected into the gas cylinder 230 of the second gas cylinder group 220 which needs to be vented to replace the gas source. The above-mentioned process is repeated until the venting of the gas source in the gas cylinders 230 in the first gas cylinder group 210 and the second gas cylinder group 220 is completed.

[0055] Optionally, the number of gas cylinders 230 in the first gas cylinder group 210 is equal to the number of gas cylinders 230 in the second gas cylinder group 220. The gas cylinder 230 can be a steel cylinder.

[0056] In this embodiment, the gas source filling module 100 is used to make the gas source (hydrogen or natural gas, etc.) in the gas storage module 200 leave the gas cylinder 230, and then deliver the gas source to the automobile to realize fuel filling.

[0057] Further, the gas source filling module 100 comprises a bidirectional booster pump 111, two gas-liquid separation tanks and at least one high-pressure hydraulic medium tank 114. For the convenience of understanding, the working principle and function of the bidirectional booster pump 111, the two gas-liquid separation tanks and the high-pressure hydraulic medium tank 114 will be introduced in detail below.

[0058] For example, the bidirectional booster pump 111 comprises a first hydraulic medium port 111a, a second hydraulic medium port 111b and a switching valve 115. The switching valve 115 comprises at least three states. When the switching valve 115 is in the first state, the hydraulic medium flowing into the second hydraulic medium port 111b is pressurized and discharged from the first hydraulic medium port 111a. When the switching valve 115 is in the second state, the hydraulic medium flowing into the first hydraulic medium port 111a is pressurized and discharged from the second hydraulic medium port 111b. When the switching valve 115 is in the third state, the bidirectional booster pump 111 does not work.

[0059] Optionally, the bidirectional booster pump 111 is a closed pump. Of course, the bidirectional booster pump 111 can also be a combination of other forms of pumps and reversing systems to realize that the inlet and outlet of the pump can meet the high pressure and can realize the reversing.

[0060] When the pressure of the hydraulic medium entering the first hydraulic medium port 111a is less than a predetermined value, the hydraulic medium can be pressurized to the predetermined value in the bidirectional booster pump 111 and then discharged from the second hydraulic medium port 111b. Of course, when the pressure of the hydraulic medium entering the second hydraulic medium port 111b is less than a predetermined value, the hydraulic medium can also be pressurized to the predetermined value in the bidirectional booster pump 111 and then discharged from the first hydraulic medium port 111a.

[0061] Optionally, when the switching valve 115 is in the first state, the first hydraulic medium port 111a is a pressure discharge port, and the second hydraulic medium port 111b is a suction port; when the switching valve 115 is in the second state, the second hydraulic medium port 111b is a pressure discharge port, and the first hydraulic medium port 111a is a suction port; when the switching valve 115 is in the third state, the bidirectional booster pump 111 is in a non-working state (i.e., not working).

[0062] It should be understood that when the first hydraulic medium port 111a is a pressure discharge port, the hydraulic pipe 116 connected to the first hydraulic medium port 111a is used to inject high-pressure hydraulic medium into the gas cylinder 230; when the first hydraulic medium port 111a is a suction port, the hydraulic pipe 116 connected to the first hydraulic medium port 111a is used to return the high-pressure hydraulic medium in the gas cylinder 230 to the bidirectional booster pump 111 and discharge it through the second hydraulic medium port 111b. The working principle of the second hydraulic medium port 111b as a pressure discharge port or a suction port is the same as that of the first hydraulic medium port 111a, which will not be described here.

[0063] For example, the two gas-liquid separation tanks are a first gas-liquid separation tank 112 and a second gas-liquid separation tank 113, each of which includes an inlet and an outlet for the entry and exit of hydraulic medium, and the inlet and the outlet are interchangeable. The inlets of the two gas-liquid separation tanks are respectively communicated with the first hydraulic medium port 111a and the second hydraulic medium port 111b of the bidirectional booster pump 111 through the hydraulic pipes 116, and the outlets of the two gas-liquid separation tanks are respectively connected to the two filling ports through the hydraulic pipes 116.

[0064] Optionally, the first hydraulic medium port 111a is communicated with the first gas-liquid separation tank 112 through the hydraulic pipe 116, and the first gas-liquid separation tank 112 is communicated with the total filling return port 260 of the first gas cylinder group 210 through the hydraulic pipe 116; the second hydraulic medium port 111b is communicated with the second gas-liquid separation tank 113 through the hydraulic pipe 116, and the second gas-liquid separation tank 113 is communicated with the total filling return port 260 of the second gas cylinder group 220 through the hydraulic pipe 116.

[0065] It should be understood that the first gas-liquid separation tank 112 and the second gas-liquid separation tank 113 are arranged to ensure that the medium returned to the first hydraulic medium port 111a or the second hydraulic medium port 111b of the bidirectional booster pump 111 is hydraulic medium, and no gas source is returned to the first hydraulic medium port 111a or the second hydraulic medium port 111b of the bidirectional booster pump 111.

[0066] Specifically, the gas source filling module 100 is in operation, and after the gas source in the gas cylinder 230 of the first gas cylinder group 210 is replaced, for example, the gas cylinder 230 of the first gas cylinder group 210 is filled with a certain amount of high-pressure hydraulic medium (for example, the amount of high-pressure hydraulic medium filled in the gas cylinder 230 is 95% of the volume of the gas cylinder 230), and the corresponding first gas-liquid separation tank 112 and the corresponding hydraulic pipeline 116 are filled with high-pressure hydraulic medium. Therefore, if the first hydraulic medium port 111a is cut as a suction port, and when the high-pressure hydraulic medium in the gas cylinder 230 of the first gas cylinder group 210 is returned, the high-pressure hydraulic medium in the gas cylinder 230 of the first gas cylinder group 210 will gradually pass through the first gas-liquid separation tank 112 and return to the gas cylinder 230 of the second gas cylinder group 220 through the bidirectional booster pump 111.

[0067] Wherein, when the high-pressure hydraulic medium in the gas cylinder 230 of the first gas cylinder group 210 is not returned, the liquid level in the first gas-liquid separation tank 112 and the corresponding hydraulic pipeline 116 will hardly change. However, when the high-pressure hydraulic medium in the gas cylinder 230 of the first gas cylinder group 210 is returned, the liquid level in the first gas-liquid separation tank 112 and the corresponding hydraulic pipeline 116 begins to change, and until the liquid level in the first gas-liquid separation tank 112 changes to a preset value, it can be judged that the high-pressure hydraulic medium in the gas cylinder 230 of the first gas cylinder group 210 has been returned. At this time, the state of the switching valve 115 is changed in time to make the bidirectional booster pump 111 reverse, so that the first hydraulic medium port 111a is no longer a suction port, so as to avoid the high-pressure hydraulic medium in the first gas-liquid separation tank 112 being completely sucked into the first hydraulic medium port 111a, that is, to ensure that no gas source is returned to the first hydraulic medium port 111a of the bidirectional booster pump 111. It can also ensure the amount of hydraulic medium injected into the gas cylinder 230 of the second gas cylinder group 220.

[0068] For example, the high-pressure hydraulic medium tank 114 can store high-pressure hydraulic medium therein and has a flow port for the high-pressure hydraulic medium to enter and exit, and the flow port is communicated with the first hydraulic medium port 111a or the second hydraulic medium port 111b through the hydraulic pipeline 116 with the first controlled valve 119.

[0069] It should be understood that when the first controlled valve 119 is in the closed state, the high-pressure hydraulic medium tank 114 is in a sealed state; when the first controlled valve 119 is in the open state, the hydraulic medium can be delivered to the first hydraulic medium port 111a or the second hydraulic medium port 111b through the flow port, or directly to the cylinder 230 of the first cylinder group 210 or the cylinder 230 of the second cylinder group 220 through the hydraulic pipeline 116 connected to the flow port.

[0070] Alternatively, the high-pressure hydraulic medium tank 114 is one. Or the high-pressure hydraulic medium tank 114 can also be provided with two or even more, when the high-pressure hydraulic medium tank 114 is provided with two, the two high-pressure hydraulic medium tanks 114 are respectively connected to the hydraulic pipeline 116 between the first gas-liquid separation tank 112 and the first hydraulic medium port 111a and the hydraulic pipeline 116 between the second gas-liquid separation tank 113 and the second hydraulic medium port 111b. Further ensure that the gas source filling module 100 makes the high-pressure hydraulic medium return to the corresponding high-pressure hydraulic medium tank 114 smoothly after the gas source leaves the cylinder 230.

[0071] It should be understood that when the gas source filling module 100 includes at least one high-pressure hydraulic medium tank 114, it can store high-pressure hydraulic medium. Therefore, after the gas source leaves the cylinder 230 is completed, the first controlled valve 119 is opened, and the direction of the bidirectional booster pump 111 is reversed, so that the hydraulic medium is delivered from the first hydraulic medium port 111a or the second hydraulic medium port 111b of the bidirectional booster pump 111 to the high-pressure hydraulic medium tank 114 through the hydraulic pipeline 116. At this time, the fourth controlled valve 122 is closed.

[0072] Secondly, after the high-pressure hydraulic medium is directly returned to the high-pressure hydraulic medium tank 114, the first controlled valve 119 is closed, so that the high-pressure hydraulic medium is stored in the high-pressure hydraulic medium tank 114, and the pressure of the high-pressure hydraulic medium is ensured. When the gas storage module 200 is operated and the next gas storage module 200 is replaced, the first controlled valve 119 is opened, and the high-pressure hydraulic medium can be directly introduced into the cylinder 230 of the gas storage module 200 through the flow port, or after being slightly pressurized by the bidirectional booster pump 111, it is introduced into the cylinder 230 of the gas storage module 200.

[0073] In addition, after a certain flow of high-pressure hydraulic medium in the high-pressure hydraulic medium tank 114 through the flow port, the first controlled valve 119 is closed, so that the gas storage module 200, the two gas-liquid separation tanks, the bidirectional booster pump 111, the hydraulic pipeline 116 connecting the gas storage module 200 and the gas-liquid separation tank, and the hydraulic pipeline 116 connecting the gas-liquid separation tank and the bidirectional booster pump 111 together constitute a closed loop passage for the closed loop circulation of the high-pressure hydraulic medium, so as to ensure the cleanliness of the gas source.

[0074] Therefore, compared with the situation that the hydraulic medium is re-pressurized from the normal pressure hydraulic medium to the high pressure hydraulic medium and then enters the gas cylinder 230 in the gas storage module 200, the contact between the hydraulic medium and the air in the normal pressure is avoided to pollute the hydraulic medium, thereby reducing the contact between the hydraulic medium and the external environment, and the cleanliness of the gas source is ensured to meet the use of the gas source. Moreover, the gas source filling module 100 improves the energy utilization rate of the gas source filling module 100, significantly reduces the power consumption of the gas source filling module 100 during work, and avoids the adverse effects of the conversion of the high pressure energy into heat on the gas source filling module 100.

[0075] Further, for the convenience of understanding, the other structures of the gas source filling module 100 and the relationship between the gas source filling module 100 and the bidirectional booster pump 111, the two gas-liquid separation tanks and the high pressure hydraulic medium tank 114 will be described in detail below.

[0076] In the embodiment, the first liquid level detector 117 is arranged in the high pressure hydraulic medium tank 114, and when the first liquid level detector 117 detects that the liquid level in the high pressure hydraulic medium tank 114 is lower than a preset value, the first controlled valve 119 is closed, and the high pressure hydraulic medium is circulated in the hydraulic pipeline 116 under the control of the bidirectional booster pump 111 to alternately flow into or flow out of the two filling ports.

[0077] It should be understood that when the high pressure hydraulic medium passing through or stored in the high pressure hydraulic medium tank 114 is injected into the high pressure hydraulic medium in the first gas cylinder group 210 through the circulation port, the flow of the high pressure hydraulic medium passing through the circulation port can be detected by the first liquid level detector 117, and when the high pressure hydraulic medium passing through the circulation port reaches a preset value, the first controlled valve 119 is closed to maintain the closed loop passage for the circulation of the high pressure hydraulic medium, which is composed of the gas storage module 200, the two gas-liquid separation tanks, the bidirectional booster pump 111, the hydraulic pipeline 116 connected to the gas storage module 200 and the gas-liquid separation tank, and the hydraulic pipeline 116 connected to the gas-liquid separation tank and the bidirectional booster pump 111.

[0078] In the embodiment, the second liquid level detector 118 is arranged in each of the two gas-liquid separation tanks, and the working state of the bidirectional booster pump 111 can be switched according to the detection result of the second liquid level detector 118.

[0079] For example, when the second liquid level detector 118 shows that the liquid level of the two gas-liquid separation tanks reaches a certain value, for example, the gas returned to the first gas-liquid separation tank 112 or the second gas-liquid separation tank 113, the liquid level starts to drop, and when the liquid level reaches a certain value, the working state of the bidirectional booster pump 111 is switched.

[0080] In addition, a pressure transmitter 128 can be arranged in the hydraulic pipeline 116 to detect the pressure in the hydraulic pipeline 116, and the working state of the bidirectional booster pump 111 can be switched by the combined detection results of the second liquid level detector 118 and the pressure transmitter 128.

[0081] In the embodiment, the bidirectional booster pump 111 is a closed pump, which further comprises a swash plate controlled by the switching valve 115 to switch the swash plate between the first position, the second position and the intermediate position between the first position and the second position.

[0082] It should be understood that when the swash plate is in the first position, the first hydraulic medium port 111a is the pressure discharge port, and the second hydraulic medium port 111b is the suction port; when the swash plate is in the second position, the second hydraulic medium port 111b is the pressure discharge port, and the first hydraulic medium port 111a is the suction port; when the swash plate is in the intermediate position, the bidirectional booster pump 111 is in the state of not doing work (i.e., not working).

[0083] In the embodiment, the hydraulic pipeline 116 between the first gas-liquid separation tank 112 and the first hydraulic medium port 111a, and the hydraulic pipeline 116 between the second gas-liquid separation tank 113 and the second hydraulic medium port 111b are respectively provided with an overpressure overflow valve 124 which is opened when the hydraulic pipeline 116 is overpressure to protect the corresponding hydraulic pipeline 116.

[0084] In the embodiment, a bypass pipeline 127 is connected between the first gas-liquid separation tank 112 and the second gas-liquid separation tank 113, the bypass pipeline 127 is provided with a second controlled valve 120, the hydraulic pipeline 116 between the first gas-liquid separation tank 112 and the first hydraulic medium port 111a is provided with a third controlled valve 121, and the hydraulic pipeline 116 between the second gas-liquid separation tank 113 and the second hydraulic medium port 111b is provided with a fourth controlled valve 122.

[0085] It should be understood that when the first gas-liquid separation tank 112 is filled with oil, and the pressure in the first gas-liquid separation tank 112 is greater than that in the second gas-liquid separation tank 113, the second controlled valve 120 can be opened until the pressure in the first gas-liquid separation tank 112 and the second gas-liquid separation tank 113 is balanced, the second controlled valve 120 is closed, the inlet and outlet of the bidirectional booster pump 111 are switched, the hydraulic medium is filled into the second gas-liquid separation tank 113, and the gas cylinder 230 corresponding to the second gas-liquid separation tank 113 is exhausted.

[0086] For example, the high-pressure hydraulic medium in the hydraulic pipeline 116 between the first gas-liquid separation tank 112 and the first hydraulic medium port 111a can be directly injected into the hydraulic pipeline 116 between the second gas-liquid separation tank 113 and the second hydraulic medium port 111b through the bypass pipeline 127; or the high-pressure hydraulic medium in the hydraulic pipeline 116 between the second gas-liquid separation tank 113 and the second hydraulic medium port 111b can be directly injected into the hydraulic pipeline 116 between the first gas-liquid separation tank 112 and the first hydraulic medium port 111a through the bypass pipeline 127.

[0087] For example, when the hydraulic pipeline 116 in the high-pressure hydraulic medium injection state changes to the high-pressure hydraulic medium return state, the pressures of the hydraulic pipelines 116 between the first gas-liquid separation tank 112 and the first hydraulic medium port 111a and between the second gas-liquid separation tank 113 and the second hydraulic medium port 111b are determined in priority. When the pressure of the hydraulic pipeline 116 corresponding to the high-pressure hydraulic medium return state is greater than the pressure of the hydraulic pipeline 116 corresponding to the high-pressure hydraulic medium injection state, at least part of the high-pressure hydraulic medium is injected from the hydraulic pipeline 116 corresponding to the high-pressure hydraulic medium return state into the hydraulic pipeline 116 corresponding to the high-pressure hydraulic medium injection state through the bypass pipeline 127.

[0088] Therefore, the bypass pipeline 127 and the second controlled valve 120 can avoid the situation that the inlet pressure of the bidirectional booster pump 111 is greater than the outlet pressure after the bidirectional booster pump 111 switches the inlet and the outlet. That is, the bypass pipeline 127 and the second controlled valve 120 can make the inlet pressure of the bidirectional booster pump 111 always less than or equal to the outlet pressure.

[0089] In the embodiment, the gas source filling module 100 further comprises a normal-pressure hydraulic medium tank 126 and a pressurizing pump 125, the normal-pressure hydraulic medium tank 126 is communicated with the high-pressure hydraulic medium tank 114 through the hydraulic pipeline 116, and the pressurizing pump 125 is arranged on the hydraulic pipeline 116 between the normal-pressure hydraulic medium tank 126 and the high-pressure hydraulic medium tank 114.

[0090] The pressurizing pump 125 is used to pre-pressurize the hydraulic medium in the normal-pressure hydraulic medium tank 126 and then supply the high-pressure hydraulic medium tank 114.

[0091] It should be understood that when the gas source filling module 100 is first filled with hydraulic medium, the hydraulic medium in the normal pressure hydraulic medium tank 126 needs to be pressurized and then supplied to the high pressure hydraulic medium tank 114, and during the subsequent cycles of the gas source filling module 100 repeatedly exhausting and switching to the next gas storage module 200, only when the hydraulic medium originally entering the high pressure hydraulic medium tank 114 is reduced due to loss, the hydraulic medium in the normal pressure hydraulic medium tank 126 is pressurized and then continuously supplied to the high pressure hydraulic medium tank 114, and then flows into the hydraulic pipeline 116 through the flow port of the high pressure hydraulic medium tank 114.

[0092] Further, a one-way valve 123 is arranged on the hydraulic pipeline 116 between the normal pressure hydraulic medium tank 126 and the high pressure hydraulic medium tank 114, so that the hydraulic medium can only flow from the normal pressure hydraulic medium tank 126 to the high pressure hydraulic medium tank 114.

[0093] It should be understood that after the gas source is removed from the gas cylinder 230, the high pressure hydraulic medium used to replace the gas source can return to the high pressure hydraulic medium tank 114 through the flow port of the high pressure hydraulic medium tank 114, without returning the high pressure hydraulic medium to the normal pressure hydraulic medium tank 126 that provides normal pressure hydraulic medium, thereby avoiding the heat generated when the high pressure hydraulic medium is converted into normal pressure hydraulic medium, and thereby adversely affecting the normal operation of the gas source filling module 100.

[0094] In this embodiment, a heat exchanger for heat dissipation can also be arranged in the hydraulic pipeline 116. In addition, a temperature transmitter 129 can be arranged in the hydraulic pipeline 116 to detect the temperature of the hydraulic medium in the corresponding hydraulic pipeline 116.

[0095] It should be understood that when the temperature detected by the temperature transmitter 129 exceeds an upper temperature limit value, the heat exchanger in the corresponding hydraulic pipeline 116 is turned on for heat dissipation; when the temperature detected by the temperature transmitter 129 is lower than a lower temperature limit value, the heat exchanger is turned off to save energy. The upper temperature limit value is not less than the lower temperature limit value.

[0096] In this embodiment, the gas source filling system further includes a control unit, which controls the first controlled valve 119 to be closed when the liquid level of the high pressure hydraulic medium tank 114 drops to a preset value, so that the gas storage module 200, the two gas-liquid separation tanks, the bidirectional booster pump 111, the hydraulic pipeline 116 connecting the gas storage module 200 and the gas-liquid separation tank, and the hydraulic pipeline 116 connecting the gas-liquid separation tank and the bidirectional booster pump 111 together form a closed loop passage for the closed loop flow of high pressure hydraulic medium, so that the high pressure hydraulic medium flows in the closed loop passage, to ensure the cleanliness of the gas source and keep the pressure value of the hydraulic medium from changing too much.

[0097] Further, the control unit further comprises a cylinder 230 exhaust monitoring module, when the cylinder 230 exhaust monitoring module exhausts the last cylinder 230, the control unit controls the first controlled valve 119 to open before the high-pressure hydraulic medium in the last cylinder 230 is exhausted, so that the high-pressure hydraulic medium returns to the high-pressure hydraulic medium tank 114 through the hydraulic pipeline 116.

[0098] Optionally, the first liquid level detector 117 is in communication connection with the control unit, when the first liquid level detector 117 detects that the liquid level in the high-pressure hydraulic medium tank 114 is lower than the set value, the control unit controls the first controlled valve 119 to close.

[0099] Optionally, the second liquid level detector 118 and the pressure transmitter 128 are in communication connection with the control unit, the bidirectional booster pump 111 is controlled by the control unit, and the control unit switches the working state of the bidirectional booster pump 111 according to the detection results of the second liquid level detector 118 and the pressure transmitter 128.

[0100] Optionally, the pressurizing pump 125 is controlled by the control unit.

[0101] Optionally, the control unit can control the opening of the corresponding heat exchanger in the hydraulic pipeline 116 for heat dissipation; when the temperature detected by the temperature transmitter 129 is lower than a temperature lower limit value, the control unit closes the corresponding heat exchanger to save energy.

[0102] Specifically, the bidirectional booster pump 111, the switching valve 115, the first controlled valve 119, the second controlled valve 120, the third controlled valve 121, the fourth controlled valve 122, the temperature transmitter 129, the heat exchanger, the pressure transmitter 128, the first liquid level detector 117, the second liquid level detector 118, the pressurizing pump 125 and the overpressure overflow valve 124 are all controlled by the control unit, so as to realize automatic control.

[0103] It should be understood that the control unit can be realized by a PLC controller or other devices, or can also be realized by a computer.

[0104] Gas source filling method of gas source filling system

[0105] In the embodiment, the gas source filling method comprises the following steps:

[0106] S1: one of the cylinders 230 of the first cylinder group 210 is communicated with the first gas-liquid separation tank 112, so as to ensure that the high-pressure hydraulic medium can enter the cylinder 230.

[0107] S2: Switch the switching valve 115 to the first state or the third state, inject the high-pressure hydraulic medium along the positive direction through the hydraulic pipeline 116 and the first gas-liquid separation tank 112 into one of the gas cylinders 230 of the first gas cylinder group 210, so that the gas source inside it is discharged outward.

[0108] When the hydraulic pipeline 116 between the first gas-liquid separation tank 112 and the first hydraulic medium port 111a is used to inject high-pressure hydraulic medium into one of the gas cylinders 230 of the first gas cylinder group 210, the hydraulic pipeline 116 is the high-pressure hydraulic medium injection pipeline 116, and the hydraulic pipeline 116 between the second gas-liquid separation tank 113 and the second hydraulic medium port 111b should be the high-pressure hydraulic medium return pipeline 116.

[0109] When the pressure in the high-pressure hydraulic medium injection pipeline 116 is equal to the pressure of the high-pressure hydraulic medium return pipeline 116, the switching valve 115 can be switched to the third state, and the bidirectional booster pump 111 does not need to work.

[0110] When the pressure of the hydraulic pipeline 116 returning the hydraulic medium is less than the pressure of the hydraulic pipeline 116 injecting the hydraulic medium, the switching valve 115 is switched to the first state to pressurize the hydraulic medium flowing into the second hydraulic medium port 111b to a preset value and then discharged from the first hydraulic medium port 111a to the hydraulic pipeline 116 between the first gas-liquid separation tank 112 and the first hydraulic medium port 111a.

[0111] After the switching valve 115 is switched to the second state or the first state, if the pressure of the corresponding high-pressure hydraulic medium return pipeline 116 is greater than the pressure of the high-pressure hydraulic medium injection pipeline 116, at least part of the high-pressure hydraulic medium is injected from the high-pressure hydraulic medium return pipeline 116 to the corresponding high-pressure hydraulic medium injection pipeline 116 through the bypass pipeline 127, bypassing the bidirectional booster pump 111; or when the pressure of the high-pressure hydraulic medium return pipeline 116 is greater than the pressure of the high-pressure hydraulic medium injection pipeline 116, the overpressure overflow valve 124 can be opened to protect the corresponding hydraulic pipeline 116.

[0112] S3: After one of the gas cylinders 230 of the first gas cylinder group 210 is exhausted, one of the gas cylinders 230 of the second gas cylinder group 220 is communicated with the second gas-liquid separation tank 113; ensure that the high-pressure hydraulic medium can return to the gas cylinder 230 of the second gas cylinder group 220.

[0113] S4: Switch the switching valve 115 to the second or third state, and return the high-pressure hydraulic medium from the gas cylinder 230 of the first gas cylinder group 210 to the first gas-liquid separator 112 in the reverse direction. At the same time, inject the high-pressure hydraulic medium into one of the gas cylinders 230 of the second gas cylinder group 220 through the hydraulic pipeline 116 and the second gas-liquid separator 113, so that the internal gas source is discharged to the outside.

[0114] It should be understood that when the hydraulic pipe 116 between the second gas-liquid separator 113 and the second hydraulic medium port 111b is used to inject high-pressure hydraulic medium into one of the gas cylinders 230 of the second gas cylinder group 220, the hydraulic pipe 116 is the hydraulic pipe 116 for injecting hydraulic medium, and the hydraulic pipe 116 between the first gas-liquid separator 112 and the first hydraulic medium port 111a should be the hydraulic pipe 116 for returning hydraulic medium.

[0115] The switching valve 115 to the second or third state and the opening status of each valve can be referred to in step S2.

[0116] S5: Repeat step S1 until the gas source in the two gas cylinders 230 of the gas storage module 200 is discharged out in turn.

[0117] Optionally, when the high-pressure hydraulic medium is injected into one of the cylinders 230 of the first cylinder group 210 or one of the cylinders 230 of the second cylinder group 220 for the first time, the bidirectional booster pump 111 is switched to the second or third state: the high-pressure hydraulic medium in the high-pressure hydraulic medium tank 114 is directly injected into the corresponding cylinder 230 through the hydraulic pipeline 116, and the bidirectional booster pump 111 does not work.

[0118] Optionally, when injecting high-pressure hydraulic medium into one of the cylinders 230 of the first cylinder group 210 or one of the cylinders 230 of the second cylinder group 220 for the first time, the high-pressure hydraulic medium in the high-pressure hydraulic medium tank 114 is injected into the corresponding cylinder 230 through the hydraulic pipeline 116, without passing through the bidirectional booster pump 111.

[0119] For example, such as Figure 1 As shown, when the high-pressure hydraulic medium is first injected into one of the cylinders 230 of the second cylinder group 220, it can be injected directly into the second gas-liquid separator 113 via the hydraulic pipeline 116 without going through the bidirectional booster pump 111, and then enter one of the cylinders 230 of the second cylinder group 220. After the cylinders 230 of the second cylinder group 220 have been vented, the bidirectional booster pump 111 is reversed, so that the high-pressure hydraulic medium in the cylinders 230 of the second cylinder group 220 is injected into one of the cylinders 230 of the first cylinder group 210 via the bidirectional booster pump 111.

[0120] In the embodiment, when the high-pressure hydraulic medium is injected into one of the first cylinder group 210 or one of the second cylinder group 220, the first controlled valve 119 is closed, so that the gas storage module 200, the two gas-liquid separation tanks, the bidirectional booster pump 111, the hydraulic pipeline 116 connecting the gas storage module 200 and the gas-liquid separation tank, and the hydraulic pipeline 116 connecting the gas-liquid separation tank and the bidirectional booster pump 111 together constitute a closed loop passage for the closed loop circulation of the high-pressure hydraulic medium.

[0121] It should be understood that, after the first cylinder 230 is completed to exhaust the gas outward, until the high-pressure hydraulic medium in the last cylinder 230 is discharged, the first controlled valve 119 is closed, so that the high-pressure hydraulic medium only circulates in the closed loop passage, thereby ensuring the cleanliness of the gas source, and ensuring that the high-pressure hydraulic medium does not return to the normal-pressure hydraulic medium tank 126, avoiding the contact of the hydraulic medium with the air in the normal-pressure hydraulic medium tank 126 to contaminate the hydraulic medium, reducing the contact of the hydraulic medium with the external environment, and also ensuring the cleanliness of the gas source to meet the use of the gas source. Of course, in this process, the hydraulic medium in the normal-pressure hydraulic medium tank 126 can be supplemented to the closed loop passage after being pressurized to ensure that there is sufficient high-pressure hydraulic medium in the closed loop passage.

[0122] S6: In the embodiment, when the high-pressure hydraulic medium injection of the last cylinder 230 of the gas storage module 200 is completed, and the gas source in the last cylinder 230 is exhausted to a preset value, the first controlled valve 119 is opened, the flow path of the high-pressure hydraulic medium between the last cylinder 230 and the high-pressure hydraulic medium tank 114 is connected, and the switching valve 115 is switched to the first state or the second state, so that the high-pressure hydraulic medium in the last cylinder 230 flows back to the high-pressure hydraulic medium tank 114 through the first hydraulic medium port 111a or the second hydraulic medium port 111b.

[0123] Therefore, when the gas source is completed to leave the cylinder 230, the high-pressure hydraulic medium used to replace the gas source can return to the high-pressure hydraulic medium tank 114 through the flow port of the high-pressure hydraulic medium tank 114, without returning the high-pressure hydraulic medium to the normal-pressure hydraulic medium tank 126 providing the normal-pressure hydraulic medium, avoiding the heat generated when the high-pressure hydraulic medium is converted into the normal-pressure hydraulic medium, thereby adversely affecting the normal operation of the gas source filling module 100.

[0124] Secondly, after the high-pressure hydraulic medium is directly returned to the high-pressure hydraulic medium tank 114, when the gas exhaust operation on one gas storage module 200 is completed and the next gas storage module 200 is replaced, the first controlled valve 119 is opened, the high-pressure hydraulic medium directly enters the cylinder 230 of the gas storage module 200 through the flow port, or is slightly pressurized by the bidirectional booster pump 111 and then enters the cylinder 230 of the gas storage module 200.

[0125] Compared with the hydraulic medium re-pressurized from the normal pressure hydraulic medium to the high pressure hydraulic medium and then entering the gas cylinder 230 in the gas storage module 200, the hydraulic medium is prevented from contacting the air in the normal pressure to contaminate the hydraulic medium, thereby reducing the contact of the hydraulic medium with the external environment, and also ensuring the cleanliness of the gas source to meet the use of the gas source. The gas source filling module 100 improves the energy utilization rate of the gas source filling module 100, significantly reduces the power consumption of the gas source filling module 100 during work, and avoids the adverse effects of the conversion of part of the high pressure energy into heat on the gas source filling module 100.

[0126] For the convenience of understanding, next, the gas source filling method of the present application is described by taking the swash plate of the bidirectional booster pump 111 in the first position and the hydraulic medium having been injected into the closed loop passage as an example.

[0127] When the swash plate is in the first position, the hydraulic pipeline 116 between the first gas-liquid separation tank 112 and the first hydraulic medium port 111a is in the high pressure hydraulic medium injection hydraulic pipeline 116, and the hydraulic pipeline 116 between the second gas-liquid separation tank 113 and the second hydraulic medium port 111b is in the high pressure hydraulic medium return hydraulic pipeline 116.

[0128] Wherein, with the operation of the bidirectional booster pump 111, the high pressure hydraulic medium in the high pressure hydraulic medium return hydraulic pipeline 116 is sucked into the bidirectional booster pump 111 through the second hydraulic medium port 111b.

[0129] Next, the sucked hydraulic medium is pressurized to a predetermined value by the bidirectional booster pump 111, and the pressurized hydraulic medium is discharged from the second hydraulic medium port 111b to the high pressure hydraulic medium injection hydraulic pipeline 116. Wherein, the predetermined pressure value is equivalent to the pressure of the gas source stored in the gas cylinder 230.

[0130] Further, the pressurized hydraulic medium is used to perform the hydraulic medium injection operation on one gas cylinder 230 in the first gas cylinder group 210 corresponding to the high pressure hydraulic medium injection hydraulic pipeline 116, and simultaneously performs the gas discharge operation.

[0131] Wherein, the hydraulic medium injection operation includes: opening the injection return port 240 of the gas cylinder 230, and injecting the pressurized hydraulic medium into the gas cylinder 230 through the corresponding hydraulic pipeline 116.

[0132] Correspondingly, the gas discharge operation includes: opening the gas discharge port 250 of the corresponding gas cylinder 230, and using the injected hydraulic medium to push the gas source in the gas cylinder 230 out of the gas discharge port 250.

[0133] Specifically, when the flow rate of the hydraulic medium in the hydraulic conduit 116 into which the hydraulic medium is injected reaches a first predetermined flow rate (for example, 95% of the volume of the gas cylinder 230), the exhaust port 250 corresponding to the gas cylinder 230 is closed to stop the exhaust operation, and the hydraulic conduit 116 is switched by the swash plate to change the hydraulic medium injection operation on the gas cylinder 230 to a hydraulic medium return operation. In the hydraulic medium return operation, the hydraulic medium in the gas cylinder 230 returns to the hydraulic conduit 116 (i.e., the hydraulic conduit 116 for returning hydraulic medium) corresponding to the gas cylinder 230. After the hydraulic medium return operation is completed, the injection return port 240 corresponding to the gas cylinder 230 is closed.

[0134] When the hydraulic conduit 116 into which the hydraulic medium is injected becomes the hydraulic conduit 116 for returning hydraulic medium, the pressure of the two hydraulic conduits 116 for injecting / returning hydraulic medium is determined in priority, and when the pressure of the hydraulic conduit 116 into which the hydraulic medium is injected is greater than the pressure of the original hydraulic conduit 116 for returning hydraulic medium, at least part of the high-pressure hydraulic medium is directly injected from the hydraulic conduit 116 for returning high-pressure hydraulic medium into the hydraulic conduit 116 for injecting high-pressure hydraulic medium through the bypass conduit 127 without passing through the bidirectional booster pump 111. In this way, the inlet pressure of the bidirectional booster pump 111 can be always less than or equal to the outlet pressure after the inlet and outlet are switched. That is, if the pressure of the hydraulic conduit 116 for returning high-pressure hydraulic medium is greater than the pressure of the hydraulic conduit 116 for injecting high-pressure hydraulic medium after the switching valve 115 is switched to the second state or the first state, at least part of the high-pressure hydraulic medium is directly injected from the hydraulic conduit 116 for returning high-pressure hydraulic medium into the hydraulic conduit 116 for injecting high-pressure hydraulic medium through the bypass conduit 127 without passing through the bidirectional booster pump 111.

[0135] It should be noted that after the switching by the swash plate, the hydraulic conduit 116 for returning hydraulic medium can become the hydraulic conduit 116 for injecting hydraulic medium, and the hydraulic conduit 116 for injecting hydraulic medium can become the hydraulic conduit 116 for returning hydraulic medium. At this time, the above steps are repeated to perform the hydraulic medium injection operation on one of the gas cylinders 230 in the second group 220 corresponding to the current hydraulic conduit 116 for injecting hydraulic medium. In this way, the gas source can be alternately obtained from the two groups of gas cylinders 230 of the gas storage module 200.

[0136] Next, the hydraulic medium return operation is specifically described by taking the case where the swash plate of the bidirectional booster pump 111 is in the second position.

[0137] At this time, the hydraulic pipe 116 between the first gas-liquid separation tank 112 and the first hydraulic medium port 111a is a hydraulic pipe 116 for returning hydraulic medium; the hydraulic pipe 116 between the second gas-liquid separation tank 113 and the second hydraulic medium port 111b is a hydraulic pipe 116 for injecting hydraulic medium, which is used for injecting hydraulic medium to one gas cylinder 230 in the second gas cylinder group 220.

[0138] When the high-pressure hydraulic medium returns to the hydraulic medium in the first gas-liquid separation tank 112 through the hydraulic pipe 116 for returning hydraulic medium, and the hydraulic medium contains gas, i.e., the liquid level of the first gas-liquid separation tank 112 starts to drop, when it is lowered to a preset value, the controlled valve of the injection-return port 240 of the first gas cylinder group 210 is closed, and the exhaust operation is stopped. That is, the second gas cylinder group 220 is full of predetermined hydraulic medium, for example, full of 90% of hydraulic medium.

[0139] And the injection / return state of the hydraulic pipe 116 is switched by the swash plate, so as to exhaust the next gas cylinder 230.

[0140] Wherein, when the hydraulic medium in the first gas-liquid separation tank 112 is lowered to less than another preset value, the normal-pressure hydraulic medium tank 126 and the pressurizing pump 125 can be controlled by the control unit to supplement the hydraulic medium in them into the closed loop passage.

[0141] Optionally, the judgment of the lack of hydraulic medium mainly depends on the pressure of the pipe system of the first gas-liquid separation tank 112 and the returned hydraulic medium when the liquid level of the first gas-liquid separation tank 112 stops returning hydraulic medium.

[0142] For example, when the pressure of the inlet of the bidirectional pressurizing pump 111 is higher, greater than 1 MPa, it can be judged that the hydraulic medium injected into the gas cylinder 230 is less than 95% of the volume of the gas cylinder 230, the amount of hydraulic medium to be supplemented is determined according to the pressure calculation, or the pressure of the hydraulic pipe 116 for returning hydraulic medium and the liquid level of the first gas-liquid separation tank 112 are jointly controlled, when the pressure reaches 1 MPa, the current liquid level of the first gas-liquid separation tank 112 is compared with the liquid level of the initial returned hydraulic medium, and then the amount of hydraulic medium to be supplemented is calculated. The amount of hydraulic medium to be supplemented is controlled by the liquid level of the high-pressure hydraulic medium tank 114, and the amount of hydraulic medium to be entered into the closed loop passage is controlled.

[0143] For the convenience of understanding, the following takes the first injection of hydraulic medium into the closed loop passage and the injection of hydraulic medium into the gas cylinder 230 in the second gas cylinder group 220 as examples to illustrate the gas source injection method of the present application.

[0144] For example, the filling capacity of the normal-pressure hydraulic medium tank 126 is at least greater than a preset value (for example, 95% of the volume of the gas cylinder 230) of the volume of the gas cylinder 230 and the sum of the maximum volumes of the first gas-liquid separation tank 112 and the second gas-liquid separation tank 113, so as to ensure that the gas cylinder 230 can be filled with 95% of the hydraulic medium.

[0145] Optionally, the filling amount of the hydraulic medium in the gas cylinder 230 is generally 95% of the volume of the gas cylinder 230, and the initial state of the equipment is that the high-pressure hydraulic medium tank 114 is filled, and the volume of the high-pressure hydraulic medium tank 114 is generally the same as the volume of the gas cylinder 230. The initial pressure of the high-pressure hydraulic medium tank 114 is kept at the hydrogen filling state, and the pressure is the pressure of the gas source filled in the gas storage module 200, which is generally 35 MPa or higher.

[0146] When the hydraulic medium is injected for the first time, the amount of the hydraulic medium injected into the closed loop is controlled by the first liquid level detector 117 on the high-pressure hydraulic medium tank 114. For example, the amount of the hydraulic medium injected into the first gas cylinder 230 of the second gas cylinder group 220 of the gas storage module 200 is 95% of the volume of the gas cylinder 230, and the second gas-liquid separation tank 113 is also filled, at which time the gas source in the first gas cylinder 230 is replaced, and 5% of the gas source remains.

[0147] It should be understood that when the hydraulic medium is injected into the gas cylinder 230 of the second gas cylinder group 220 for the first time, the hydraulic medium can be directly injected into the second gas-liquid separation tank 113 through the hydraulic pipeline 116 without passing through the bidirectional booster pump 111, and then entering one of the gas cylinders 230 of the second gas cylinder group 220. After the gas in the gas cylinder 230 of the second gas cylinder group 220 is exhausted, the bidirectional booster pump 111 is reversed to inject the high-pressure hydraulic medium in the gas cylinder 230 of the second gas cylinder group 220 into one of the gas cylinders 230 of the first gas cylinder group 210 through the bidirectional booster pump 111.

[0148] Specifically, when the gas in the gas cylinder 230 of the second gas cylinder group 220 is exhausted, the bidirectional booster pump 111 is reversed to inject the hydraulic medium in the gas cylinder 230 of the second gas cylinder group 220 into the corresponding hydraulic pipeline 116 of the first gas cylinder group 210, the first gas-liquid separation tank 112, and the first gas cylinder 230 of the first gas cylinder group 210 through the bidirectional booster pump 111, until the gas medium returns to the second gas-liquid separation tank 113. At this time, the second liquid level detector 118 detects the liquid level and sends a signal to determine that the first gas cylinder 230 of the first gas cylinder group 210 of the gas storage module 200 has completed the injection of 95% of the hydraulic medium, and the gas source has been replaced. Thus, the cycle is repeated until the gas storage module 200 completes the gas unloading operation.

[0149] When the gas storage module 200 finishes the gas discharging operation, the hydraulic medium is in the last gas cylinder 230 in the first gas cylinder group 210. At this time, the bidirectional booster pump 111 is reversed, so that the hydraulic medium in the last gas cylinder 230 passes through the first hydraulic medium port 111a, the second hydraulic medium port 111b and the hydraulic pipeline 116, the first controlled valve 119 is opened, so that the hydraulic medium is completely returned to the high-pressure hydraulic medium tank 114, and the first controlled valve 119 is controlled to be closed by the control unit, so that the high-pressure hydraulic medium tank 114 is disconnected from the closed loop passage. Until the next gas storage module 200 is discharged, the first controlled valve 119 is controlled to be opened by the control unit, so as to control the high-pressure hydraulic medium tank 114 to communicate with the closed loop passage. Then repeat the above-mentioned gas discharging mode of the previous gas storage module 200.

[0150] In the embodiment, the bidirectional booster pump 111, the switching valve 115, the first controlled valve 119, the second controlled valve 120, the third controlled valve 121, the fourth controlled valve 122, the temperature transmitter 129, the heat exchanger, the pressure transmitter 128, the first liquid level detector 117, the second liquid level detector 118, the pressure pump 125 and the overpressure overflow valve 124 can be controlled by the control unit, so as to realize automatic control.

[0151] It should be understood that the control unit can be realized by a PLC controller or other devices, or can also be realized by a computer.

[0152] In addition, the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined and limited.

[0153] In the present application, unless otherwise specifically defined and limited, the terms "assembly", "connection" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0154] In the description of the specification, the description of the terms "some embodiments", "exemplarily" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0155] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application. Any changes or modifications made in accordance with the claims and specification of the present application shall be within the scope of the present application.

Claims

1. A gas source filling module for discharging a gas source from a gas cylinder, characterized in that, include: A bidirectional booster pump includes: a first hydraulic medium port, a second hydraulic medium port, and a switching valve. The switching valve has at least three states. In the first state, the switching valve pressurizes the hydraulic medium flowing into the second hydraulic medium port and discharges it from the first hydraulic medium port. In the second state, the switching valve pressurizes the hydraulic medium flowing into the first hydraulic medium port and discharges it from the second hydraulic medium port. In the third state, the bidirectional booster pump does not perform any work. Two gas-liquid separators, namely a first gas-liquid separator and a second gas-liquid separator, each including an inlet and an outlet for hydraulic medium, the inlet and outlet being interchangeable. The inlets of the two gas-liquid separators are respectively connected to the first and second hydraulic medium ports of the bidirectional booster pump via hydraulic pipelines, and the outlets of the two gas-liquid separators are respectively connected to two filling ports via hydraulic pipelines; a bypass pipeline connects the first gas-liquid separator and the second gas-liquid separator. At least one high-pressure hydraulic medium tank stores high-pressure hydraulic medium and has a flow port for the hydraulic medium to enter and exit. The flow port is connected to either the first hydraulic medium port or the second hydraulic medium port via a hydraulic pipe equipped with a first controlled valve. When the first controlled valve is in the closed state, the high-pressure hydraulic medium tank is in a sealed state; when the first controlled valve is in the open state, the hydraulic medium can be transported to the first hydraulic medium port or the second hydraulic medium port through the flow port. The gas source refueling module also includes: An atmospheric pressure hydraulic medium tank is connected to the high pressure hydraulic medium tank via a hydraulic pipeline; a one-way valve is provided on the hydraulic pipeline between the atmospheric pressure hydraulic medium tank and the high pressure hydraulic medium tank so that the hydraulic medium can only flow from the atmospheric pressure hydraulic medium tank to the high pressure hydraulic medium tank. A booster pump is installed on the hydraulic pipeline between the atmospheric pressure hydraulic medium tank and the high pressure hydraulic medium tank.

2. The gas source filling module according to claim 1, characterized in that, The bidirectional booster pump is a closed-loop pump, which includes a swashplate. The swashplate is controlled by the switching valve to switch between a first position, a second position, and an intermediate position between the first and second positions. The greater the angle at which the swashplate deviates from the intermediate position, the greater the flow rate of the hydraulic medium discharged from the first hydraulic medium port or the second hydraulic medium port.

3. The gas source filling module according to claim 1, characterized in that, A second controlled valve is installed on the bypass pipeline, a third controlled valve is installed on the hydraulic pipeline between the first gas-liquid separator and the first hydraulic medium port, and a fourth controlled valve is installed on the hydraulic pipeline between the second gas-liquid separator and the second hydraulic medium port.

4. The gas source filling module according to claim 1, characterized in that, The high-pressure hydraulic medium tank is equipped with a first liquid level detector. The first liquid level detector is communicatively connected to the control unit. When the first liquid level detector detects that the liquid level in the high-pressure hydraulic medium tank is lower than a preset value, the first controlled valve is closed. Under the control of the bidirectional booster pump, the high-pressure hydraulic medium flows back and forth through the hydraulic pipeline and alternately flows into or out of the two filling ports.

5. The gas source filling module according to claim 4, characterized in that, The two gas-liquid separation tanks are each equipped with a second liquid level sensor. The second liquid level sensor is communicatively connected to the control unit. The bidirectional booster pump switches its operating state based on the result detected by the second liquid level sensor.

6. A gas source injection system, characterized in that, Including claim 1 The gas source refueling module according to any one of the following five claims further includes: a gas storage module. The gas storage module includes: a first gas cylinder group and a second gas cylinder group. Each gas cylinder group includes multiple gas cylinders connected in parallel to store gas sources. Each gas cylinder includes: an exhaust port for discharging gas sources and an injection and return port for injecting and returning hydraulic medium. The injection and return ports of each gas cylinder in each gas cylinder group are interconnected through hydraulic pipelines with controlled valves and converge into a main injection and return port. The main injection port of each gas cylinder group can be detachably connected to the two injection ports of the gas source injection module via a docking interface.

7. The gas source injection system according to claim 6, characterized in that, It also includes a control unit, which controls the first controlled valve to close when the liquid level in the high-pressure hydraulic medium tank drops to a preset value, so that the gas storage module, the two gas-liquid separators, the bidirectional booster pump, the hydraulic pipeline connecting the gas storage module and the gas-liquid separators, and the hydraulic pipeline connecting the gas-liquid separators and the bidirectional booster pump together form a closed-loop path for the high-pressure hydraulic medium to flow in a closed loop. The control unit also includes a gas cylinder exhaust monitoring module. When the gas cylinder exhaust monitoring module detects that the exhaust of the last gas cylinder has been completed, the control unit controls the first controlled valve to open, so that the high-pressure hydraulic medium returns to the high-pressure hydraulic medium tank through the hydraulic pipeline.

8. A gas source injection method for the gas source injection system as described in claim 6, characterized in that, Includes the following steps: Connect one of the gas cylinders in the first gas cylinder group to the first gas-liquid separator. Switch the switching valve to the first or third state, and inject the high-pressure hydraulic medium into one of the gas cylinders of the first gas cylinder group along the positive direction through the hydraulic pipeline and the first gas-liquid separator, so that the internal gas source is discharged outward. After one of the gas cylinders in the first gas cylinder group has finished venting, connect one of the gas cylinders in the second gas cylinder group to the second gas-liquid separator. Switch the switching valve to the second or third state, and the high-pressure hydraulic medium flows back from the gas cylinder of the first gas cylinder group to the first gas-liquid separator in the reverse direction. At the same time, the high-pressure hydraulic medium is injected into one of the gas cylinders of the second gas cylinder group through the hydraulic pipeline and the second gas-liquid separator, so that the internal gas source is discharged outward. Repeat the above steps to discharge the gas from the gas cylinders of the two gas cylinder groups of the gas storage module in turn.

9. The gas source injection method of the gas source injection system as described in claim 8, characterized in that, After the first gas cylinder has finished venting, until the high-pressure hydraulic medium in the last gas cylinder is discharged, the first controlled valve is closed. The gas storage module, the two gas-liquid separators, the bidirectional booster pump, the hydraulic pipeline connecting the gas storage module and the gas-liquid separators, and the hydraulic pipeline connecting the gas-liquid separators and the bidirectional booster pump together form a closed-loop passage for the high-pressure hydraulic medium to flow in a closed loop, so that the high-pressure hydraulic medium only flows within the closed-loop passage.

10. The gas source injection method of the gas source injection system as described in claim 8, characterized in that, When high-pressure hydraulic medium is first injected into one of the cylinders in the first cylinder group or one of the cylinders in the second cylinder group: The high-pressure hydraulic medium in the high-pressure hydraulic medium tank is injected into the corresponding gas cylinder through the hydraulic pipeline, without passing through the bidirectional booster pump.

11. The gas source injection method of the gas source injection system as described in claim 8, characterized in that, When the high-pressure hydraulic medium in the last gas cylinder of the gas storage module is fully injected and the internal gas source is discharged to the outside to a preset value: Connect the flow path of the high-pressure hydraulic medium between the last gas cylinder and the high-pressure hydraulic medium tank, and switch the switching valve to the first state or the second state, so that the high-pressure hydraulic medium in the last gas cylinder flows back to the high-pressure hydraulic medium tank through the first hydraulic medium port or the second hydraulic medium port.

12. The gas source injection method of the gas source injection system as described in claim 8, characterized in that, After the switching valve is switched to the second state or the first state, if the pressure of the hydraulic pipeline corresponding to the return high-pressure hydraulic medium is greater than the pressure of the hydraulic pipeline injecting high-pressure hydraulic medium, at least part of the high-pressure hydraulic medium is bypassed by the bidirectional booster pump and directly injected from the hydraulic pipeline of the return high-pressure hydraulic medium into the hydraulic pipeline of the corresponding injection high-pressure hydraulic medium through the bypass pipeline.

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