CN211600223U

CN211600223U - Vehicle filling system

Info

Publication number: CN211600223U
Application number: CN201922261795.2U
Authority: CN
Inventors: 杨学升
Original assignee: Shanghai Pujiang Specialty Gases Co ltd
Current assignee: Shanghai Pujiang Specialty Gases Co ltd
Priority date: 2019-12-16
Filing date: 2019-12-16
Publication date: 2020-09-29
Anticipated expiration: 2029-12-16

Abstract

The utility model discloses a vehicle filling system, include: the air source is connected with the vehicle charging pipeline control system through a first pipeline, the outlet end of the air source is also connected with a second pipeline, the second pipeline is provided with an air charging compressor, the outlet end of the air charging compressor is connected with the vehicle charging pipeline control system, and the inlet end and the outlet end of the air charging compressor are also connected through a third pipeline; the third line includes a third valve for opening or closing the third line. The utility model discloses utilize the pressure differential of air supply and on-vehicle gas cylinder, aerify the vehicle through first pipeline, improved the filling speed of initial stage greatly, when on-vehicle gas cylinder pressure and air supply pressure balance, the first pipeline of disconnection is breathed in through the air entrainment compressor and is carried out the hydrogenation to the vehicle, can improve the gas filling volume of system, has shortened the filling time, has improved filling efficiency.

Description

Vehicle filling system

Technical Field

The utility model relates to a hydrogen filling technical field, in particular to vehicle filling system is particularly useful for annotating hydrogen.

Background

In recent years, with the international and domestic demands for clean energy, hydrogen energy vehicles are beautifully shown in different cities, the hydrogen energy vehicles are subjected to hydrogenation without exception, a hydrogen compressor is adopted to suck hydrogen from an air source into the compressor to pressurize and fill the air storage bottle for the vehicle until the pressure of the air storage bottle reaches 35MPa, the conventional hydrogenation mode inevitably has the defects that the hydrogenation speed is high when the pressure of the air source is high, the hydrogenation speed is gradually reduced when the pressure of the air source is continuously reduced along with the hydrogenation, the hydrogenation time is continuously prolonged, and the hydrogenation time is multiplied, so that the hydrogen energy vehicles are an industrial process characteristic, but are still unstable hydrogenation, and really cause inconvenience to customers.

SUMMERY OF THE UTILITY MODEL

The utility model provides a vehicle filling system can solve the above-mentioned defect among the prior art.

The technical scheme of the utility model as follows:

a vehicle refueling system comprising: the air source is connected with the vehicle charging pipeline control system through a first pipeline; the inlet end of the air charging compressor is connected with the outlet end of the air source, and the outlet end of the air charging compressor is connected with the vehicle charging pipeline control system; and a third pipeline is connected between the inlet end of the air charging compressor and the outlet end of the air charging compressor, the third pipeline comprises a third valve for opening or closing the third pipeline, and the vehicle charging pipeline control system further comprises an air charging pipeline connected with a vehicle to be charged.

The air supply is hydrogen long tube trailer, and hydrogen long tube trailer gathers into through first pipeline, third pipeline and fills car pipeline control system, and the end of gas charging line includes the hydrogenation rifle, inserts through the hydrogenation rifle and waits to annotate the vehicle.

Preferably, the first line includes a first valve for opening or closing the first line. When the vehicle to be filled is hydrogenated through the first pipeline and the pressure of the gas cylinder of the vehicle to be filled is balanced with the pressure of the hydrogen long-tube trailer, the first pipeline can be shut off through the first valve, and hydrogen is prevented from circulating between the first pipeline and the gas filling compressor.

Preferably, the vehicle charging pipeline control system comprises a human-computer exchange interface for displaying charging information and gas cylinder information of the vehicle to be charged; and the gas filling compressor and the third valve are electrically connected with the controller respectively. The third valve is used for opening the third pipeline, and when the hydrogenation is finished, the controller controls the third valve to be automatically opened, so that the hydrogen circulates between the gas-adding compressor and the third pipeline, and the operation is simple. The model number of the PLC is 6ES7288-1ST20-0AA0, and the PLC is used for stopping the gas filling compressor and starting and closing the third valve. After the gas filling compressor is shut down, if the gas filling compressor needs to be restarted, the start button for manually starting the gas filling compressor is needed

Preferably, the gas-filling compressor is a diaphragm compressor with the model number of D166LM 45; the pressure of the hydrogen long-tube trailer is 15-20MPa, the pressure of a gas cylinder of a vehicle to be filled is lower initially, and the pressure difference between the hydrogen long-tube trailer and the gas cylinder of the vehicle to be filled is utilized to directly hydrogenate the vehicle to be filled through the first pipeline, so that the initial filling amount is increased; when the pressure of the gas cylinder of the vehicle to be filled is balanced with the pressure of the hydrogen long pipe trailer, the gas filling compressor is started, and the vehicle to be filled is filled by sucking gas through the gas filling compressor. The first pipeline is directly hydrogenated and is combined with the gas filling compressor for hydrogenation, so that the gas filling amount is increased, the gas filling time is shortened, and the gas filling efficiency is improved. Meanwhile, when the hydrogenation is finished, the gas-adding compressor does not need to be shut down, the third valve is opened, hydrogen circulates between the gas-adding compressor and the third pipeline, and damage to a machine caused by the fact that the gas-adding compressor is normally opened and normally closed is avoided.

Preferably, the hydrogen tube trailer further comprises a fourth pipeline for connecting the raw material hydrogen, and a second compressor for connecting the fourth pipeline and the hydrogen tube trailer. The hydrogen raw material is conveyed to the hydrogen long-tube trailer through the second compressor, so that the pressure of the hydrogen long-tube trailer is always maintained at a high pressure state of 15-19MPa, the gas-filling compressor always works at a high efficiency state, and the working time of hydrogenation is stabilized.

Preferably, the hydrogen long-tube trailer further comprises an inert gas replacement pipeline for connecting inert gas, and the inert gas replacement pipeline is connected to the outlet end of the hydrogen long-tube trailer or the outlet end of the raw material hydrogen. The hydrogen long pipe trailer is connected with the outlet end of the hydrogen long pipe trailer and can be used for replacing air in the first pipeline, the third pipeline, the hydrogen compressor, the vehicle charging pipeline control system and the gas charging pipeline with inert gas; the outlet end of the hydrogen connected with the raw material can be used for replacing air in the fourth pipeline and the second compressor with inert gas, so that the hydrogen cannot be mixed with air, and the safety of hydrogenation is ensured.

Preferably, the outlet end of the hydrogen long-tube trailer is provided with a first pressure gauge for displaying the outlet pressure of the hydrogen long-tube trailer, and the outlet end of the gas-adding compressor is provided with a second pressure gauge for displaying the outlet pressure of the gas-adding compressor.

Preferably, the second pressure gauge is electrically connected with the controller, converts the outlet pressure of the gas filling compressor into an electric signal and feeds the electric signal back to the controller; and the tail end of the inflation pipeline is provided with an air gun which is electrically connected with the controller. And the controller controls the air gun to automatically jump according to the received electric signal fed back by the second pressure gauge, and stops inflating.

Preferably, the front end of the gas charging compressor is provided with a compressor inlet valve, and the rear end of the gas charging compressor is provided with a compressor outlet valve, so that the gas charging compressor is protected, and meanwhile, the safety of hydrogenation is ensured.

Compared with the prior art, the beneficial effects of the utility model are as follows:

first, the utility model discloses a vehicle filling system, hydrogen long-tube trailer directly with fill car pipe control system through first pipeline and be connected, at the initial in-process of filling, directly treat the filling vehicle through first pipeline and aerify, the filling speed at initial stage has been improved greatly, when treating filling vehicle gas cylinder pressure and air supply pressure balance, break off first pipeline, open the second pipeline, breathe in through the hydrogenation compressor and treat the filling vehicle and annotate, directly fill through first pipeline and breathe in the mode of aerifing that combines with the hydrogenation compressor, improved the utility model discloses a vehicle filling system's filling amount can reach filling amount more than the twice of conventional hydrogenation system, has shortened the filling time, has improved filling efficiency.

Secondly, the vehicle filling system of the utility model conveys the hydrogen raw material to the hydrogen long-tube trailer through the second compressor, so as to ensure the pressure of the hydrogen long-tube trailer to be between 15 and 19MPa, so that the hydrogen long-tube trailer is always in a high-pressure state, thereby greatly improving the suction pressure of the hydrogenation compressor, namely improving the suction capacity; meanwhile, after hydrogenation is finished, the hydrogenation compressor is not required to be closed, and a third valve of a third pipeline is opened, so that the hydrogenation compressor is in an internal circulation state, and the hydrogenation compressor is prevented from being damaged by normally opening and closing; meanwhile, the hydrogen filling process is controlled through the PLC, the automatic gun jumping of the hydrogenation gun and the automatic opening of the third valve are controlled, the operation is simple and convenient, and the hydrogenation process is more stable.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.

Drawings

FIG. 1 is a schematic diagram of a hydrogen energy charging system of embodiment 1;

fig. 2 is a schematic view of the hydrogen energy charging system of example 1.

Detailed Description

The operation flow of hydrogen gas inflation in the prior art is as follows: the purchased long pipe vehicle is used as a gas source of a hydrogen charging vehicle compressor, hydrogen of the long pipe vehicle is sucked by a hydrogenation compressor, and the compressed long pipe vehicle hydrogen is charged into a gas storage bottle of the hydrogen energy vehicle, and is full of the compressed long pipe vehicle hydrogen along with continuous pressurization work of the compressor until the outlet pressure of the compressor is increased to more than 35MPa and the gas storage bottle pressure of the hydrogen energy vehicle reaches 35 MPa. The on-site hydrogenation gun automatically jumps, and the hydrogenation compressor automatically enters a self-circulation mode. The hydrogen charging vehicle in the prior art has the following problems: the pressure of the outsourcing long pipe car hydrogen as the gas source is higher at the beginning of use, the filling efficiency is good, but with the continuous operation of the hydrogen energy source car hydrogenation, the hydrogen in the outsourcing long pipe car as the gas source can be continuously reduced, and the pressure of the gas source car can be continuously reduced. All the hydrogenation compressors are positive displacement compressors, and the reduction of the pressure of an air source inevitably leads to the reduction of the compressed air quantity of the compressors in unit time in the same ratio, thereby causing the prolonging of the charging time and the reduction of the charging efficiency. The hydrogen energy vehicle with 2 gas storage bottles can be filled in more than 5 minutes from the initial high pressure of the gas source vehicle to the final low pressure of the gas source vehicle, and the hydrogen energy vehicle with 2 gas storage bottles can be filled in more than 20 minutes, and the prolonging of the vehicle filling time is a balanced prolonging process.

The novel pipeline connection of filling system through redesign of this implementation has solved the unsettled process problem of hydrogenation time that appears in the domestic conventional hydrogenation technology, has overcome the shortcoming that has prolonged the hydrogenation time along with the decline of air supply pressure.

Specifically, the domestic conventional hydrogenation process operation flow is that the suction gas source of the compressor is a long-tube trailer with the actual pressure of 18-19MPa, and when the gas source pressure is highest, one vehicle is filled with hydrogen energy vehicles with two gas storage bottles, and the pressure is 30MPa and the pressure is 7.5Kg, and the time for filling 1 vehicle is about 6 minutes; when the pressure of the pipe trailer is reduced to the low position, the time of filling 1 vehicle is at least 15 minutes. The hydrogenation time of the conventional compression hydrogenation mode is continuously prolonged along with the reduction of the pressure of the long-tube trailer. Through the utility model discloses a vehicle filling system can be with above-mentioned hydrogenation under the same condition of volume, with hydrogenation time stable control at 5-6 minutes, realize filling the vehicle more than double quantity in the same time completely.

The present invention will be further described with reference to the following specific examples. It should be understood that these examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention. In practical applications, the improvement and adjustment made by those skilled in the art according to the present invention still belong to the protection scope of the present invention.

Example 1

A vehicle refueling system comprising: the hydrogen long-tube trailer TT is connected with the car-filling pipeline control system 10 through a first pipeline 21, the hydrogen long-tube trailer TT further comprises a hydrogenation compressor, the inlet end of the hydrogenation compressor is connected with the outlet end of the hydrogen long-tube trailer TT, and the outlet end of the hydrogenation compressor is connected with the car-filling pipeline control system; a third pipeline 23 is further connected between the inlet end of the hydrogenation compressor and the outlet end of the hydrogenation compressor, the third pipeline 23 comprises a third valve 43 for opening or closing the third pipeline 23, and the vehicle charging pipeline control system 10 further comprises a charging pipeline 25 connected with a vehicle to be charged.

Referring to fig. 1 and 2, in the embodiment, the front end of the hydrogenation compressor is connected to the hydrogen long-tube trailer through the second pipeline 22, and the rear end of the hydrogenation compressor is connected to the car-filling pipeline control system 10 through the second pipeline 22. The vehicle charging pipeline control system 10 includes a human-machine interface for displaying charging information, such as a pressure value at an outlet end of the hydrogenation compressor, and a pressure value of a gas cylinder of a vehicle to be charged. The car-charging pipeline control system 10 further comprises a PLC controller, and the hydrogenation compressor and the third valve 43 are electrically connected to the PLC controller, respectively. The third valve 43 is used for opening the third pipeline 23, and when the hydrogenation is finished, the PLC controller controls to open the third valve 43, so that hydrogen circulates between the hydrogenation compressor and the third pipeline 23.

In this embodiment, the outlet end of the hydrogenation compressor is further provided with a second pressure gauge P, specifically a pressure transmitter, with a model of DG1300-GY-B-2-40, for displaying the gas pressure at the outlet of the hydrogenation compressor. Meanwhile, the second pressure gauge P is electrically connected with the PLC controller, the pressure value is converted into an electric signal, and the PLC controller controls the opening and closing of the third valve according to the size of the received electric signal.

In this embodiment, the hydrogen long tube trailer TT merges hydrogen into the vehicle charging pipeline control system 10 through the first pipeline 21 and the third pipeline 23, and the tail end of the charging pipeline 25 includes a hydrogenation gun, and is connected to the vehicle to be charged through the hydrogenation gun. Specifically, the model of the hydrogenation gun is TK16 type or TK25 type, and the hydrogenation gun is electrically connected with the PLC, when the pressure value at the outlet of the hydrogenation compressor is increased to 35MPa, the second pressure gauge P sends an electric signal to the PLC, the PLC controls the hydrogenation gun to automatically jump according to the received electric signal, the charging of hydrogen is stopped, the third valve 43 is controlled to be automatically opened, and the compressor enters an inner circulation state.

In this embodiment, the head end of the hydrogenation gun is provided with a gas pressure sensor, and is connected with the controller, and during hydrogenation, the gas pressure sensor is used for detecting the pressure value of the vehicle-mounted gas cylinder of the vehicle to be filled, and displaying the pressure value on the man-machine exchange interface.

In this example, the hydrogenation compressor is a diaphragm compressor, and the model is D166LM 45. The pressure of the hydrogen long-tube trailer TT is 15-19MPa, the pressure of a gas cylinder of a vehicle to be filled is lower initially, and the pressure difference between the hydrogen long-tube trailer TT and the gas cylinder of the vehicle to be filled is utilized to directly hydrogenate the vehicle to be filled through the first pipeline 21, so that the initial filling amount is increased; when the pressure of the gas cylinder of the vehicle to be filled is balanced with the pressure of the hydrogen long-tube trailer TT, the hydrogenation compressor is started, and the vehicle to be filled is filled by sucking gas through the hydrogenation compressor. The first pipeline 21 is directly hydrogenated and combined with the hydrogenation compressor for hydrogenation, so that the gas filling amount is increased, the gas filling time is shortened, and the gas filling efficiency is improved. Meanwhile, when the hydrogenation is finished, the hydrogenation compressor does not need to be shut down, and the third valve 43 is opened, so that hydrogen circulates between the hydrogenation compressor and the third pipeline 23, and the damage to the machine caused by the normal opening and closing of the hydrogenation compressor is avoided.

Preferably, the first line 21 comprises a first valve 41 for opening or closing the first line 21. When the vehicle to be filled is hydrogenated through the first pipeline 21 and the pressure of the gas cylinder of the vehicle to be filled is balanced with the pressure of the hydrogen long-tube trailer TT, the first pipeline 21 can be closed through the first valve 41, and hydrogen is prevented from circulating between the first pipeline 21 and the hydrogenation compressor.

Specifically, the third valve 43 is a pneumatic valve, model 1.4571/peek-F. The PLC model is 6ES7288-1ST20-0AA 0.

Preferably, the hydrogen-generating device also comprises a fourth pipeline 24 for connecting the raw material hydrogen, and a second compressor for connecting the fourth pipeline 24 with the hydrogen long-pipe trailer TT. The hydrogen of the raw material is conveyed to the hydrogen long tube trailer TT through the second compressor, so that the pressure of the hydrogen long tube trailer TT is always maintained at a high pressure state of 15-19MPa, the hydrogenation compressor always works at a high efficiency state, and the hydrogenation working time is stabilized.

Preferably, an inert gas replacement line 26 is included for connecting an inert gas. Specifically, the inert gas is nitrogen gas, which is stored in a cylinder, and referring to fig. 1, a gas replacement line 26 is shown connected to the second line 22, and referring to fig. 2, a gas replacement line 26 is shown connected to the fourth line 24. The inert gas is used for replacing the air in the pipelines with the inert gas, for example, the air in the first pipeline 21, the second pipeline 22, the third pipeline 23, the aeration pipeline 25 and the fourth pipeline 24 is replaced with the inert gas, so that the purity of the hydrogen is ensured, and the safety of hydrogenation is ensured. The position that inert gas replaced pipeline 26 specifically connects should set up according to the overall arrangement of actual pipeline length and pipeline, and is not used for the restriction the utility model discloses a protection scope, fig. 1 and fig. 2 have only given a route of connection of inert gas replacement pipeline 26, and actual hookup location is not limited to this, and no longer the repeated description herein one by one.

Preferably, the front end of the hydrogenation compressor is provided with a compressor inlet valve, and the rear end of the hydrogenation compressor is provided with a compressor outlet valve. The inlet valve and the outlet valve of the compressor are used for protecting the hydrogenation compressor, and meanwhile, the safety of the hydrogenation process is guaranteed.

In this embodiment, hydrogen long-tube trailer includes an export main valve, and hydrogen long-tube trailer's export main valve rear end is equipped with a first manometer (not shown in the figure) that is used for showing hydrogen long-tube trailer exit pressure, specifically is a pressure transmitter, is connected with the PLC controller electricity for show hydrogen long-tube trailer's outlet end pressure, and convert the pressure value into the signal of telecommunication, feed back to the PLC controller.

In this embodiment, the charging pipeline control system 10 further includes a field button, such as an emergency stop button, electrically connected to the controller for emergency shutdown of the hydrogen compressor. When an emergency occurs in a hydrogenation site, the hydrogenation compressor can be closed through an emergency stop button. After the hydrogenation compressor is shut down, a start button of the hydrogenation compressor needs to be manually started.

The vehicle filling system of the embodiment works as follows:

and opening an outlet valve of the nitrogen steel cylinder, performing inert gas replacement on the first pipeline, the second pipeline, the hydrogenation compressor, the third pipeline, the vehicle charging pipeline control system and the gas charging pipeline, replacing air in the system with nitrogen, and repeatedly replacing for 3-8 times. After the replacement is completed, the outlet valve of the hydrogen long-tube trailer can be opened to replace the nitrogen in the system with hydrogen.

After the vehicle to be filled stops at the designated position, the driver extinguishes, the vehicle enters a hydrogenation area after static electricity is released, and hydrogenation personnel place a vehicle blocking notice board at the tail of the vehicle to be filled, place a wheel block and carry out static electricity grounding on the vehicle. And (3) confirming the type of the gas cylinder interface of the vehicle to be filled by the hydrogenator, checking the effective date and the residual pressure of the gas cylinder, and refusing to execute the filling operation by the hydrogenator if the pressure is lower than 2MPa or the gas cylinder exceeds the effective period. And if the hydrogenation condition is met, butting the gun head of the hydrogenation gun with the joint of the vehicle to be filled, and rotating the hydrogenation gun 180 degrees to point to the ON position.

Slowly opening an outlet main valve of a hydrogen long-tube trailer, opening a first valve 41, directly hydrogenating the vehicle to be filled by the hydrogen long-tube trailer through a first pipeline, closing the first valve 41 when the pressure value of a gas cylinder of the vehicle to be filled is balanced with the pressure at the outlet end of the hydrogen long-tube trailer, starting a hydrogenation compressor, continuously hydrogenating the vehicle to be filled by sucking air through the hydrogenation compressor, sending an electric signal to a PLC (programmable logic controller) by a second pressure gauge P when the pressure value at the outlet end of the hydrogenation compressor is increased to 35MPa, controlling the automatic gun jumping of the hydrogenation gun by the PLC according to the received electric signal, stopping hydrogen filling, controlling a third valve 43 to be automatically opened, and enabling the hydrogenation compressor to enter an internal circulation state.

The hydrogen energy vehicle filling system of the embodiment firstly ensures that the pressure of the hydrogen filling long pipe trailer TT is between 15 and 19MPa, greatly improves the suction pressure of the compressor, namely improves the suction capacity, and simultaneously adopts the hydrogen long pipe trailer TT for direct filling when the pressure of the hydrogen energy vehicle-mounted gas cylinder is lower than 15MPa, and greatly improves the initial filling speed.

In this embodiment, the hydrogenation compressor is in a frequency conversion self-circulation state under low pressure, that is, in low-energy consumption sleep-like self-circulation work, when a gas cylinder of a vehicle to be filled is filled with gas to about 15MPa, the hydrogenation compressor is switched to a normal working state manually, the hydrogenation compressor sucks the pressure gas source hydrogen of the hydrogen tube trailer TT to perform hydrogenation work until the pressure is increased to 35MPa, the hydrogenation gun automatically jumps, and the hydrogenation compressor automatically enters the self-circulation state. The hydrogen long tube trailer TT is directly aerated through the first pipeline 21 and is combined with the two modes of air suction of the hydrogenation compressor, and the gas filling amount of the hydrogen energy vehicle filling system of the embodiment is greatly increased. And the PLC controller is used for controlling the gun jump of the hydrogenation gun and the start and the close of the third valve 43, so that the operation is simple, and the hydrogenation process is more stable.

The vehicle filling system of the embodiment is used for filling hydrogen, and can also be used for filling other gases, such as natural gas, and the like, and is not limited herein.

The above disclosure is only illustrative of the preferred embodiments of the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vehicle refueling system, comprising: the air source is connected with the vehicle charging pipeline control system through a first pipeline; the inlet end of the air charging compressor is connected with the outlet end of the air source, and the outlet end of the air charging compressor is connected with the vehicle charging pipeline control system; and a third pipeline is connected between the inlet end of the air charging compressor and the outlet end of the air charging compressor, the third pipeline comprises a third valve for opening or closing the third pipeline, and the vehicle charging pipeline control system further comprises an air charging pipeline connected with a vehicle to be charged.

2. The vehicle filling system of claim 1, wherein said first line includes a first valve for opening or closing said first line.

3. The vehicle filling system of claim 1, wherein the vehicle charging circuit control system comprises a human machine interface and a PLC controller, and the filling compressor and the third valve are electrically connected to the PLC controller respectively.

4. A vehicle filling system according to claim 1, wherein the filling compressor is a diaphragm compressor.

5. The vehicle filling system of claim 3, wherein the gas source is a hydrogen tube trailer, the pressure of the hydrogen tube trailer being set to 15-20 MPa.

6. The vehicle filling system of claim 5, further comprising a fourth line connecting the feedstock hydrogen gas, and a second compressor connecting the fourth line to the hydrogen long tube trailer.

7. The vehicle filling system of claim 6, further comprising an inert gas replacement line for connecting an inert gas, the inert gas replacement line being connected to the outlet end of the hydrogen long-tube trailer or the outlet end of the raw hydrogen.

8. The vehicle filling system according to claim 6, wherein a first pressure gauge for displaying the outlet pressure of the hydrogen long-tube trailer is arranged at the outlet end of the hydrogen long-tube trailer, and a second pressure gauge for displaying the outlet pressure of the gas-filling compressor is arranged at the outlet end of the gas-filling compressor.

9. The vehicle refueling system as recited in claim 8, wherein the second pressure gauge is electrically connected to the PLC controller; and an air filling gun is arranged at the tail end of the air filling pipeline and is electrically connected with the PLC.

10. The vehicle filling system of claim 1, wherein the front end of the filling compressor is further provided with a compressor inlet valve, and the rear end of the filling compressor is provided with a compressor outlet valve.