Compatible oil gun gas-liquid ratio testing system and method for vehicle-mounted oil gas recovery system

Abstract

The invention relates to the technical field of gas station oil gun testing, and discloses a compatible oil gun gas-liquid ratio testing system and method for a vehicle-mounted oil gas recovery system. The system comprises a refueling unit, the refueling unit comprises a variable-diameter oil pipe and an air pump, the variable-diameter oil pipe is provided with a double-layer structure and an air bag formed by the double-layer structure, the air pump can inflate and deflate the air bag, and during refueling, the oil inlet end of the variable-diameter oil pipe is connected with a refueling gun, and the oil outlet end of the variable-diameter oil pipe is communicated to a vehicle oil tank; the gas-liquid ratio testing unit is used for testing the gas-liquid ratio in the refueling gun during refueling; the control unit is set to be that when it is judged that the refueling vehicle is not provided with the vehicle-mounted oil gas recovery system, the air pump is closed; and when it is judged that the refueling vehicle is provided with the vehicle-mounted oil gas recovery system, the air pump is started to inflate the air bag, and the refueling pipe diameter of the variable-diameter oil pipe is decreased. The system provided by the invention can realize a gas-liquid ratio test function when ORVR compatible oil guns of different brands and models are used for refueling vehicles of national V and national VI models on a gas station site.

Description

Technical Field

[0001] The invention relates to the technical field of testing fuel guns at gas stations, and in particular to a gas-to-liquid ratio testing system and method for a fuel gun compatible with a vehicle-mounted fuel gas recovery system. Background Art

[0002] With the increasingly stringent emission regulations in my country, automobile exhaust emissions have been effectively controlled, and evaporative emissions have exceeded the amount of HC emitted by exhaust gases. According to GB20952-2020 "Emission Standards for Air Pollutants from Gas Stations", all gas stations in my country that sell gasoline should install secondary oil and gas recovery systems. The refueling oil and gas recovery system of a gas station refers to the process of recovering the oil and gas generated when refueling the car's fuel tank into an underground oil tank by using a closed collection method that assists in the recovery of oil and gas through a vacuum generator when refueling the car. The recovery of the oil and gas recovery system can reduce the emission of oil and gas pollutants into the atmosphere during the refueling process, thereby achieving the purpose of protecting the environment. The secondary oil and gas recovery system mainly includes secondary oil and gas recovery refueling guns, coaxial hoses, oil and gas separators, gas-liquid ratio regulating valves, vacuum pumps and other equipment.

[0003] In July 2020, GB18352.6-2016 "Light-duty Vehicle Pollutant Emission Limits and Measurement Methods (China Phase VI)" was issued. The regulations added a new Type VII refueling pollutant emission test for automobile fuel systems, stipulating that the evaporative pollutant emissions during the refueling process shall not exceed 0.05g / L. This regulation aims to reduce oil and gas pollution emissions and energy waste during refueling, and requires that new National VI models after July 1, 2020 must meet this regulatory requirement. For gasoline vehicle fuel systems, the National VI regulations are mainly reflected in the tightening of fuel evaporation control, that is, from the 2g / test (test cycle) of the National V regulations to 0.7g / test of the National VI regulations, and the addition of a refueling pollutant emission test. To meet this standard requirement, domestically sold vehicles must be equipped with an on-board oil and gas recovery system (ORVR) from 2020.

[0004] The on-board oil and gas recovery system is a control technology that efficiently reduces oil and gas pollution during the refueling process. By installing an activated carbon canister in the vehicle's fuel supply system, a liquid seal is formed in the thinner refueling line when the vehicle is refueling, which can prevent oil and gas from escaping from the refueling pipe. At the same time, the oil and gas overflowing from the fuel tank during refueling are transported to the activated carbon canister through the vent valve and adsorbed, thereby realizing oil and gas recovery and avoiding waste. The promotion and application of the on-board oil and gas recovery system is of great significance to reducing emissions from the current vehicle fuel system.

[0005] At present, ordinary refueling guns adapted to the National Five system have an independent and closed pressure-sensing working system integrated with the gun body. When the main valve of the oil gun opens and the high-speed oil flow passes through the return valve, the return valve assembly has a special structural design, which generates negative pressure inside the pressure-sensing system. Under normal working conditions, the negative pressure of the pressure-sensing system will be continuously supplemented by gas through the vent pipe located in the oil outlet pipe to maintain the upper and lower air pressures of the pressure-sensing diaphragm in a basically balanced state. When the filling liquid level rises and overflows and closes the vent pipe opening, the negative pressure in the pressure-sensing system will rise rapidly, and the air pressure on both sides of the pressure-sensing diaphragm will lose balance. The diaphragm drives the switch card to move to the negative pressure side to disengage the gun, so that the refueling gun can complete the self-sealing closing action in a very short time. At the same time, ordinary refueling guns have the function of adjusting the gas-liquid ratio for refueling the fuel tank of National Five vehicles.

[0006] In addition to the various functions of ordinary refueling guns, the on-board oil and gas recovery compatible oil and gas recovery refueling guns adapted to the National VI system also need to have an adjustment function that is compatible with the existing secondary oil and gas recovery system. Since the secondary oil and gas recovery systems in gas stations in my country are all vacuum-assisted systems, if the secondary oil and gas recovery system is shared with the on-board oil and gas recovery system, the secondary oil and gas recovery system will inhale a large amount of air into the buried oil tank, which will cause excessive incompatible emissions of oil and gas. Therefore, according to the requirements of GB20952-2020, when the number of cars with on-board oil and gas recovery systems is greater than 20%, gas stations should use oil and gas recovery refueling equipment that is compatible with on-board oil and gas recovery systems, that is, the secondary oil and gas recovery system should be able to identify vehicles with on-board oil and gas recovery systems, and when refueling vehicles with on-board oil and gas recovery systems, the gas-liquid ratio is reduced to below 0.5; when refueling vehicles without on-board oil and gas recovery systems, the gas-liquid ratio remains unchanged in the range of 1.0-1.2.

[0007] Faced with the current situation that the number of National V vehicles is huge and the number of National VI vehicles is increasing year by year, the existing gas-liquid ratio test equipment of the on-board oil and gas recovery system compatible oil and gas recovery refueling gun uses a single test device for testing, that is, the fuel tanks of National V and National VI models need to correspond to two different gas-liquid ratio test devices, and it is impossible to achieve a universal gas-liquid ratio test for the fuel tanks of the two models. On the basis of ensuring the recovery performance of the on-board oil and gas recovery system, in order to simultaneously realize the gas-liquid ratio calibration function of the ORVR refueling gun when refueling the fuel tanks of both National V and National VI models, it is urgent to develop a portable ORVR compatible refueling gun gas-liquid ratio test method and calibration device that is universal for both National V and National VI models. Summary of the invention

[0008] The purpose of the present invention is to provide a gas-to-liquid ratio testing system and method for a vehicle-mounted oil and gas recovery system compatible fueling gun. The present invention can complete the diameter-changing operation of adapting the National V and National VI fuel tanks to the fueling pipe by setting a variable-diameter oil pipe and using an air pump in combination, and combine the two sets of fuel tank assemblies of the National V and National VI vehicles into one, thereby realizing the function of performing a gas-to-liquid ratio test on the fuel tanks of the National V and National VI B vehicles without switching the fuel gun, thereby efficiently realizing the system's diagnosis and analysis of the working status of the vehicle-mounted oil and gas recovery fueling gun compatible with the oil and gas collection system.

[0009] In order to achieve the above-mentioned object, the present invention provides, on one hand, a vehicle-mounted oil and gas recovery system compatible fueling gun gas-liquid ratio testing system, the system comprising:

[0010] A refueling unit, the refueling unit comprising a variable diameter oil pipe and an air pump, the variable diameter oil pipe having a double-layer structure and an air bag formed by the two-layer structure, the air pump being capable of inflating and deflating the air bag, and when refueling, the oil inlet end of the variable diameter oil pipe is connected to a refueling gun, and the oil outlet end is connected to a vehicle fuel tank;

[0011] A gas-liquid ratio testing unit, used to test the gas-liquid ratio in the refueling gun during refueling; and

[0012] The control unit is configured to: when it is determined that the refueling vehicle does not have an on-board oil and gas recovery system, turn off the air pump; when it is determined that the refueling vehicle has an on-board oil and gas recovery system, start the air pump to inflate the airbag to reduce the refueling pipe diameter of the variable diameter oil pipe.

[0013] Preferably, the double-layer structure of the variable diameter oil pipe includes a metal outer layer and a rubber inner layer.

[0014] Preferably, the variable diameter oil pipe also has a hose connected to the automobile fuel tank, and the hose has a five-layer structure. The materials from the inner layer to the outer layer are nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), fluororubber (FKM), polymer of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride (THV) and chlorosulfonated polyethylene (CSM).

[0015] Preferably, the gas-liquid ratio testing unit comprises an oil-gas flow meter, and the oil-gas flow meter is connected to a close-fitting adapter installed at the nozzle of the refueling gun.

[0016] Preferably, the gas-liquid ratio testing unit further comprises a calculation module, which is configured to calculate the gas-liquid ratio based on the oil and gas volume obtained by the oil and gas flow meter and the refueling volume provided by the refueling device that delivers gasoline to the refueling gun.

[0017] Preferably, the oil and gas flow meter is a Roots flow meter.

[0018] Preferably, the system also includes a data acquisition and display unit for collecting, displaying and storing various parameters during the refueling process, including: refueling volume, oil and gas volume, air pump status, detection time, gas-liquid ratio, real-time refueling flow rate, real-time return gas flow rate and real-time gas-liquid ratio.

[0019] A second aspect of the present invention provides a method for testing the gas-liquid ratio of a fuel tank gun compatible with a vehicle-mounted fuel gas recovery system. The method is operated using the aforementioned vehicle-mounted fuel tank gun compatible with a fuel gas recovery system gas-liquid ratio testing system. The method comprises:

[0020] Connect the variable diameter oil pipe to the vehicle's fuel tank and refuel through the fuel gun;

[0021] When the system determines that the refueling vehicle does not have an on-board oil and gas recovery system, the air pump is turned off, the airbag of the variable diameter oil pipe is not inflated, and the inner tube of the variable diameter oil pipe is in a relaxed state; when the system determines that the refueling vehicle has an on-board oil and gas recovery system, the air pump is turned on to inflate the airbag, so that the inner tube of the variable diameter oil pipe is in a taut state;

[0022] The oil and gas volume in the refueling gun during refueling is detected, and the gas-liquid ratio of the refueling gun is determined according to the refueling volume of the refueling gun.

[0023] Preferably, the method further comprises: comparing the gas-liquid ratio detection value with a preset gas-liquid ratio value to determine whether the gas-liquid ratio regulating valve function of the refueling gun is effective.

[0024] Preferably, the process of judging whether the gas-liquid ratio regulating valve function of the fueling gun is effective includes:

[0025] When the refueling vehicle does not have an on-board oil and gas recovery system, if the gas-liquid ratio detection value is greater than or equal to 1.2, it is determined that the gas-liquid ratio regulating valve function of the refueling gun is effective;

[0026] When the refueling vehicle is equipped with an on-board oil and gas recovery system, if the gas-liquid ratio detection value is less than or equal to 0.5, it is determined that the gas-liquid ratio regulating valve function of the refueling gun is effective;

[0027] If the gas-liquid ratio detection value is greater than 0.5 and less than 1.2, it is determined that the gas-liquid ratio regulating valve function of the fuel gun is invalid.

[0028] Preferably, the method also includes: when the system determines that the refueling vehicle does not have an on-board oil and gas recovery system, setting the gas-liquid ratio of the refueling gun to 1-1.2; when the system determines that the refueling vehicle has an on-board oil and gas recovery system, setting the gas-liquid ratio of the refueling gun to below 0.5.

[0029] The vehicle-mounted oil and gas recovery system (ORVR) compatible gas-to-liquid ratio test system for a refueling gun of the present invention mainly includes a refueling unit, a gas-to-liquid ratio test unit and a control unit, wherein the refueling unit includes a variable diameter oil pipe and an air pump, and the air pump can be used to adjust the inner diameter of the variable diameter oil pipe, thereby controlling the oil inlet rate and matching the oil inlet rate requirements of the National V / National VI fuel tanks respectively; the control unit can control the opening and closing of the air pump according to whether the refueling vehicle has an on-board oil and gas recovery system, thereby adjusting the inner diameter of the variable diameter oil pipe; the gas-to-liquid ratio test unit can test the gas-to-liquid ratio in the refueling gun. The entire test system can realize the refueling pipe diameter adjustment corresponding to the National V / National VI fuel tank, the gas-to-liquid ratio verification of the oil gun and other test functions.

[0030] Since the upper limits of the oil inlet rates of the fuel tanks of National V and National VI vehicles are different, the upper limit of the oil inlet rate of the National V fuel tank is 50L / min, and the upper limit of the oil inlet rate of the National VI fuel tank is 38L / min. When the oil and gas recovery system compatible oil and gas recovery refueling gun is refueling the National V vehicle, the air pump in the refueling unit is turned off, and the airbag is not inflated. Without the effect of the airbag, the inner tube of the variable diameter oil pipe is in the original relaxed state without the extrusion pressure, the diameter of the inner tube is thicker, and the refueling rate is faster. When the oil and gas recovery system compatible oil and gas recovery refueling gun is refueling the National VI vehicle equipped with the on-board oil and gas recovery system, the airbag of the variable diameter oil pipe is quickly inflated under the action of the air pump, and the airbag squeezes the inner tube of the variable diameter oil pipe, making the inner tube in a taut state, reducing the diameter of the inner tube, forming a liquid seal, and reducing the refueling flow rate, so that the refueling rate meets the upper limit flow rate requirements of the National VI fuel tank. According to the technical solution of the present invention, an air pump is used to inflate and deflate the airbag in the variable diameter oil pipe, to stretch and shrink the inner diameter of the variable diameter oil pipe, and to adjust the oil flow rate during refueling. By setting different gas-liquid ratios for the refueling gun according to whether there is an on-board oil and gas recovery system, the oil and gas recovery requirements of the National V and National VI fuel tanks are met, and the fault signal is judged by the calibration device, and the statistical analysis of the gas-liquid ratio value of each refueling process is realized, the gas-liquid ratio pass rate data of each refueling gun can be obtained, and the on-site gas-liquid ratio detection of the ORVR-compatible refueling gun can be realized.

[0031] The technical solution of the present invention can efficiently complete the gas-liquid ratio calibration work of ORVR-compatible fueling guns at gas stations. By detecting the compatible gas-liquid ratio of the fuel tank, the recovery effect of the oil and gas recovery system can be understood, and the connection reliability of the refueling operation at the gas station can be guaranteed, which is beneficial to ensuring the safe use of oil products. It has long-term economic and social benefits in promoting social development and invigorating the market economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the vehicle-mounted oil and gas recovery system compatible fueling gun gas-liquid ratio testing system of the present invention.

[0033] Description of Reference Numerals

[0034] 1. Fuel gun; 2. Air pump; 3. Variable diameter oil pipe; 4. Vehicle fuel tank; 5. Oil and gas flow meter; 6. Three-way valve. DETAILED DESCRIPTION

[0035] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0036] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0037] In this document, unless otherwise specified or limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internally connected between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] At present, the on-board oil and gas recovery system determines whether the vehicle has an on-board oil and gas recovery system through the mechanical structure of the compatible oil and gas recovery refueling gun, and then realizes the gas-liquid ratio adjustment function through the built-in structure of the oil gun. When refueling a vehicle, the oil and gas recovery system compatible oil and gas recovery refueling gun needs to be tested for the National V and National VI B fuel tank assemblies respectively. The fuel tank structure and oil pipe diameter of different types of vehicles are different. The gas-liquid ratio test of different oil guns needs to be carried out separately. The testing process is time-consuming, labor-intensive and inefficient. In order to realize the gas-liquid ratio verification function of the ORVR-compatible fuel gun at the gas station, the present invention configures a variable-diameter oil pipe, and through the cooperation of the status signal (whether the refueling vehicle has an on-board oil and gas recovery system) and the air pump, completes the diameter-changing operation of the National V and National VI fuel tank adaptation fuel pipe, and combines the two sets of fuel tank assemblies of the National V and National VI vehicles into one, so as to realize the function of refueling gas-liquid ratio test for the fuel tanks of the National V and National VI B vehicles without switching the fuel gun, thereby efficiently realizing the system's diagnosis and analysis of the working status of the oil and gas recovery fuel gun compatible with the on-board oil and gas recovery system.

[0039] The vehicle-mounted oil and gas recovery system compatible fueling gun gas-liquid ratio testing system of the present invention comprises:

[0040] A refueling unit, the refueling unit comprises a variable diameter oil pipe 3 and an air pump 2, the variable diameter oil pipe 3 has a double-layer structure and an air bag formed by the two-layer structure, the air pump 2 can inflate and deflate the air bag, when refueling, the oil inlet end of the variable diameter oil pipe 3 is connected to the refueling gun 1, and the oil outlet end is connected to the vehicle fuel tank 4;

[0041] A gas-liquid ratio testing unit, used to test the gas-liquid ratio in the refueling gun 1 during refueling; and

[0042] The control unit is configured to: when it is determined that the refueling vehicle does not have an on-board oil and gas recovery system, turn off the air pump 2; when it is determined that the refueling vehicle has an on-board oil and gas recovery system, start the air pump 2 to inflate the airbag, so that the refueling pipe diameter of the variable diameter oil pipe 3 becomes smaller.

[0043] In the system described in the present invention, the refueling gun 1 is an ORVR-compatible refueling gun, which can determine whether the vehicle is equipped with an on-board oil and gas recovery system, and transmit the obtained status signal (i.e., whether the refueling vehicle is equipped with an on-board oil and gas recovery system) to the air pump 2. By controlling the opening and closing of the air pump 2, the inner diameter size of the variable diameter oil pipe 3 can be adjusted.

[0044] In the system of the present invention, preferably, the inner layer of the variable diameter oil pipe 3 is made of rubber material, and the outer layer is made of metal material. Such a double-layer structure has a simple processing technology, and the fuel penetration is 0. The two-layer oil pipe has an air bag built in, and the air pump 2 can inflate and deflate the air bag.

[0045] In the system of the present invention, preferably, the variable diameter oil pipe 3 also has a hose connected to the automobile fuel tank. Further preferably, the hose has a five-layer structure, and the materials from the inner layer to the outer layer are nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), fluororubber (FKM), tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride polymer (THV) and chlorosulfonated polyethylene (CSM). With such a hose structure, the amount of fuel penetration can be reduced.

[0046] In the system described in the present invention, the gas-liquid ratio test unit includes an oil-gas flowmeter 5, which is connected to a close-fitting adapter installed at the nozzle of the refueling gun 1. The oil and gas generated during the refueling process pass through the oil and gas flowmeter 5, and the oil and gas volume measured by the calibration device is measured.

[0047] In the system described in the present invention, the gas-liquid ratio testing unit also includes a calculation module, which is configured to calculate the gas-liquid ratio based on the oil and gas volume obtained by the oil and gas flow meter 5 and the refueling volume provided by the refueling device that delivers gasoline to the refueling gun 1.

[0048] In the system described in the present invention, the gas-liquid ratio testing unit also includes a three-way valve 6. The oil and gas from the refueling gun 1 enter the three-way valve 6 after passing through the oil and gas flow meter 5. On the one hand, they can be returned to the vehicle tank through the three-way valve 6, and on the other hand, they can be recovered through an oil and gas recovery device, such as recovering the gasoline in the tank after the test to an underground oil tank to achieve oil reuse.

[0049] In the system described in the present invention, the oil and gas flow meter 5 can be a conventional flow meter in the art. In a preferred embodiment, in order to obtain higher test accuracy, the oil and gas flow meter 5 is a Roots flow meter. The accuracy level of the Roots flow meter is above level 2.

[0050] In the system described in the present invention, the system may also include a data acquisition and display unit for acquiring, displaying and storing various parameters during the refueling process, including: refueling volume, oil and gas volume, air pump status, detection time, gas-liquid ratio, real-time refueling flow rate, real-time return gas flow rate and real-time gas-liquid ratio.

[0051] The present invention also provides a method for testing the gas-liquid ratio of a fuel gun compatible with a vehicle-mounted fuel gas recovery system by using the above-mentioned gas-liquid ratio testing system for the fuel gun compatible with a vehicle-mounted fuel gas recovery system. Specifically, the method comprises:

[0052] Connect the variable diameter oil pipe 3 to the vehicle fuel tank 4, and refuel through the refueling gun 1;

[0053] When the system determines that the refueling vehicle does not have an on-board oil and gas recovery system, the air pump 2 is turned off, the air bag of the variable diameter oil pipe 3 is not inflated, and the inner tube of the variable diameter oil pipe 3 is in a relaxed state; when the system determines that the refueling vehicle has an on-board oil and gas recovery system, the air pump 2 is turned on to inflate the air bag, so that the inner tube of the variable diameter oil pipe 3 is in a taut state;

[0054] The oil and gas volume in the refueling gun 1 during refueling is detected, and the gas-liquid ratio of the refueling gun is determined according to the refueling volume of the refueling gun 1.

[0055] In the present invention, the gas-liquid ratio testing method of the vehicle-mounted oil and gas recovery system compatible fueling gun may also include: comparing the gas-liquid ratio detection value with a preset gas-liquid ratio value to determine whether the gas-liquid ratio regulating valve function of the fueling gun 1 is effective.

[0056] Specifically, the process of judging whether the gas-liquid ratio regulating valve function of the fueling gun 1 is effective includes:

[0057] When the refueling vehicle does not have an on-board oil and gas recovery system, if the gas-liquid ratio detection value is greater than or equal to 1.2, it is determined that the gas-liquid ratio regulating valve function of the refueling gun 1 is effective;

[0058] When the refueling vehicle is equipped with an on-board oil and gas recovery system, if the gas-liquid ratio detection value is less than or equal to 0.5, it is determined that the gas-liquid ratio regulating valve function of the refueling gun 1 is effective;

[0059] If the gas-liquid ratio detection value is greater than 0.5 and less than 1.2, it is determined that the gas-liquid ratio regulating valve of the fueling gun 1 has failed.

[0060] In the present invention, the gas-liquid ratio testing method of the vehicle-mounted oil and gas recovery system compatible fueling gun may also include: when the system determines that the refueling vehicle does not have an on-board oil and gas recovery system, the gas-liquid ratio of the fueling gun 1 is set to 1-1.2; when the system determines that the refueling vehicle has an on-board oil and gas recovery system, the gas-liquid ratio of the fueling gun 1 is set to below 0.5.

[0061] The following examples further illustrate the vehicle-mounted oil and gas recovery system compatible fueling gun gas-liquid ratio test system and method of the present invention. The examples are implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the following examples.

[0062] The experimental methods in the following examples, unless otherwise specified, are all conventional methods in the art. The experimental materials used in the following examples, unless otherwise specified, are all commercially available.

[0063] Example 1

[0064] like Figure 1 As shown, the vehicle-mounted oil and gas recovery system compatible gas-to-liquid ratio testing system for a refueling gun described in this embodiment includes: a refueling unit, a gas-to-liquid ratio testing unit and a control unit, wherein the refueling unit includes a variable diameter oil pipe 3 and an air pump 2, the variable diameter oil pipe 3 has a double-layer structure and an air bag formed by the two-layer structure, the air pump 2 can inflate and deflate the air bag, and when refueling, the oil inlet end of the variable diameter oil pipe 3 is connected to the refueling gun 1, and the oil outlet end is connected to the vehicle fuel tank 4; the gas-to-liquid ratio testing unit is used to test the gas-to-liquid ratio in the refueling gun 1 during refueling; the control unit is configured to: when it is determined that the refueling vehicle does not have an on-board oil and gas recovery system, turn off the air pump 2; when it is determined that the refueling vehicle has an on-board oil and gas recovery system, start the air pump 2 to inflate the air bag, so that the refueling pipe diameter of the variable diameter oil pipe 3 becomes smaller. The double-layer structure of the variable diameter oil pipe 3 includes a metal outer layer and a rubber inner layer. The variable diameter oil pipe 3 also has a hose connected to the automobile fuel tank. The hose has a five-layer structure. The materials from the inner layer to the outer layer are nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), fluororubber (FKM), a polymer of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride (THV) and chlorosulfonated polyethylene (CSM).

[0065] Example 2

[0066] like Figure 1 As shown, the vehicle-mounted oil and gas recovery system compatible gas-fueling gun gas-liquid ratio testing system described in this embodiment includes: a refueling unit, a gas-liquid ratio testing unit and a control unit, wherein the refueling unit includes a variable diameter oil pipe 3 and an air pump 2, the variable diameter oil pipe 3 has a double-layer structure and an air bag formed by the two-layer structure, the air pump 2 can inflate and deflate the air bag, when refueling, the oil inlet end of the variable diameter oil pipe 3 is connected to the refueling gun 1, and the oil outlet end is connected to the vehicle tank 4; the gas-liquid ratio testing unit is used to test the gas-liquid ratio in the refueling gun 1 when refueling, and the gas-liquid ratio testing unit The invention comprises an oil and gas flow meter 5 and a calculation module, wherein the oil and gas flow meter 5 is connected to a close-fitting adapter installed at the nozzle of the refueling gun 1, and the calculation module is configured to calculate the gas-liquid ratio according to the oil and gas volume obtained by the oil and gas flow meter 5 and the refueling volume provided by the refueling device for delivering gasoline to the refueling gun 1; the control unit is configured to: when it is determined that the refueling vehicle does not have an on-board oil and gas recovery system, turn off the air pump 2; when it is determined that the refueling vehicle has an on-board oil and gas recovery system, start the air pump 2 to inflate the airbag, so that the refueling pipe diameter of the variable diameter oil pipe 3 becomes smaller. The double-layer structure of the variable diameter oil pipe 3 includes a metal outer layer and a rubber inner layer, and the variable diameter oil pipe 3 also has a hose connected to the automobile fuel tank, and the hose has a five-layer structure, and the materials from the inner layer to the outer layer are nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), fluororubber (FKM), a polymer of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride (THV) and chlorosulfonated polyethylene (CSM).

[0067] Example 3

[0068] like Figure 1As shown, the vehicle-mounted oil and gas recovery system compatible gas-to-liquid ratio test system for a refueling gun described in this embodiment includes: a refueling unit, a gas-to-liquid ratio test unit, a control unit and a data acquisition and display unit, wherein the refueling unit includes a variable diameter oil pipe 3 and an air pump 2, the variable diameter oil pipe 3 has a double-layer structure and an air bag formed by the two-layer structure, the air pump 2 can inflate and deflate the air bag, when refueling, the oil inlet end of the variable diameter oil pipe 3 is connected to the refueling gun 1, and the oil outlet end is connected to the vehicle tank 4; the gas-to-liquid ratio test unit is used to test the gas-to-liquid ratio in the refueling gun 1 when refueling, the gas-to-liquid ratio test unit includes an oil-gas flow meter 5 and a calculation module, the oil-gas flow meter 5 is connected to a close-fitting adapter installed at the nozzle of the refueling gun 1, and the The calculation module is configured to calculate the gas-liquid ratio based on the oil and gas volume obtained by the oil and gas flow meter 5 and the refueling volume provided by the refueling device that delivers gasoline to the refueling gun 1, wherein the oil and gas flow meter 5 is a Roots flow meter; the control unit is configured to: when it is determined that the refueling vehicle does not have an on-board oil and gas recovery system, turn off the air pump 2; when it is determined that the refueling vehicle has an on-board oil and gas recovery system, start the air pump 2 to inflate the airbag to reduce the refueling pipe diameter of the variable diameter oil pipe 3; the data acquisition and display unit is used to collect, display and store various parameters during the refueling process, and the parameters include: refueling volume, oil and gas volume, air pump status, detection time, gas-liquid ratio, real-time refueling flow rate, real-time return flow rate and real-time gas-liquid ratio. The double-layer structure of the variable diameter oil pipe 3 includes a metal outer layer and a rubber inner layer. The variable diameter oil pipe 3 also has a hose connected to the automobile fuel tank. The hose has a five-layer structure. The materials from the inner layer to the outer layer are nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), fluororubber (FKM), a polymer of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride (THV) and chlorosulfonated polyethylene (CSM).

[0069] Example 4

[0070] This embodiment is used to illustrate the gas-liquid ratio test method of the vehicle-mounted oil vapor recovery system compatible fueling gun of the present invention. The method is implemented in the vehicle-mounted oil vapor recovery system compatible fueling gun gas-liquid ratio test system described in Example 3. Specifically, the method includes:

[0071] Connect the variable diameter oil pipe 3 to the vehicle fuel tank 4, and refuel through the refueling gun 1;

[0072] When the system determines that the refueling vehicle does not have an on-board oil and gas recovery system, the air pump 2 is turned off, the airbag of the variable diameter oil pipe 3 is not inflated, the inner tube of the variable diameter oil pipe 3 is in a relaxed state, and the gas-liquid ratio of the refueling gun 1 is set to 1-1.2; when the system determines that the refueling vehicle has an on-board oil and gas recovery system, the air pump 2 is turned on to inflate the airbag, so that the inner tube of the variable diameter oil pipe 3 is in a taut state, and the gas-liquid ratio of the refueling gun 1 is set to less than 0.5;

[0073] Detecting the oil and gas volume in the refueling gun 1 during refueling, and determining the gas-liquid ratio of the refueling gun according to the refueling volume of the refueling gun 1;

[0074] The gas-liquid ratio detection value is compared with the preset gas-liquid ratio value to determine whether the gas-liquid ratio regulating valve function of the refueling gun 1 is effective. Specifically, when the refueling vehicle does not have an on-board oil and gas recovery system, if the gas-liquid ratio detection value is greater than or equal to 1.2, it is determined that the gas-liquid ratio regulating valve function of the refueling gun 1 is effective;

[0075] When the refueling vehicle is equipped with an on-board oil and gas recovery system, if the gas-liquid ratio detection value is less than or equal to 0.5, it is determined that the gas-liquid ratio regulating valve function of the refueling gun 1 is effective;

[0076] If the gas-liquid ratio detection value is greater than 0.5 and less than 1.2, it is determined that the gas-liquid ratio regulating valve of the fueling gun 1 has failed.

[0077] Example 5

[0078] This embodiment is used to illustrate the gas-liquid ratio test method of the vehicle-mounted oil and gas recovery system compatible fueling gun of the present invention. The main implementation steps of the test method of this embodiment are the same as those of Example 4. The detailed operation is as follows:

[0079] National V and National VI B emission standard automobile fuel tank storage tank: It includes the fuel tank body (mostly a multi-layer material structure), the fuel tank supporting valve group, the fuel tank port, the ORVR recovery carbon canister, etc. The bottom of the fuel tank is opened to connect the valve and the return oil pipe, which can control the self-flow of oil back to the storage tank; among them, the effective volume of the carbon canister assembly is about twice that of the non-ORVR recovery carbon canister to ensure that the activated carbon can completely absorb the fuel vapor generated during the refueling process, and at the same time has a very low ventilation resistance to ensure the smooth refueling and prevent overflow or backspray. The setting of the return oil pipe and the liquid storage tank can avoid oil waste and realize the recycling of oil. Diverse automobile fuel tank assemblies can be used to test the gas-liquid ratio adaptation performance of fuel tanks of different models. It needs to be grounded when used.

[0080] Before testing, the tightness and reliability of each component of the entire system must be checked. The battery power and operating status of the detection device must be confirmed in advance, and the device must be well grounded. The tightness test of the gas-liquid ratio adapter must be carried out in an explosion-proof area.

[0081] When the vehicle-mounted oil and gas recovery system compatible oil and gas recovery refueling gun is not refueling, that is, when the oil flow signal of the refueling machine is 0, the air pump 2 in the refueling unit is in a stationary state, the variable diameter oil pipe 3 is in a stationary state, and the air pump 2 does not work. If the air pump 2 is in a non-stationary state at this time, the oil and gas recovery online detection system can determine that the refueling gun connected to the air pump has a fault, and then the air pump needs to be repaired or replaced. After the various equipment in the test system has been checked and found to be correct, the test system is set with parameters such as single refueling test time, oil inlet flow rate, and number of repetitions, and the gas-liquid ratio test fixture of the refueling gun is connected to the test vehicle tank assembly. 15-20L of gasoline is added to the vehicle tank 4 in advance to make the tank have the initial condition of containing oil and gas, and the ORVR compatible refueling gun number is set.

[0082] At the beginning of the test, the refueling time is set in the gas-liquid ratio test unit, the indication on the refueling machine is cleared, the refueling gun is opened to start refueling with a high-speed flow rate first and then a low-speed flow rate, the oil pump is started, the oil and gas recovery system is started synchronously, the oil and gas recovery vacuum pump is started, and the oil product is pumped from the liquid storage tank through the refueling machine and the oil pipeline into the vehicle-mounted oil and gas recovery compatible oil and gas recovery refueling gun 1, and then from the refueling gun through the adapter and the variable diameter oil pipe 3 into the vehicle tank 4. Since the diameter of the oil filling pipe of the National V standard automobile adapted refueling pipe is generally φ (28 ~ 35) mm, and the exhaust pipe is φ16 mm. Therefore, when the system determines that the vehicle is not equipped with an on-board oil and gas recovery system (that is, the refueling vehicle does not have an on-board oil and gas recovery system) when refueling, the air pump 2 is in a stationary state, the air pump does not work, the air bag in the variable diameter oil pipe 3 is not inflated, and the inner tube of the variable diameter oil pipe 3 is in a relaxed state. The diameter of the oil filling pipe of the National VI standard automobile adapting to the refueling pipe is generally less than φ28mm. Therefore, when the system determines that the vehicle is refueling with an on-board oil and gas recovery system (i.e., the refueling vehicle has an on-board oil and gas recovery system), the air pump 2 is in working state, the air pump inflates the airbag of the variable diameter oil pipe 3, and the inner tube of the variable diameter oil pipe 3 is in a taut state, squeezing the inner diameter of the oil pipe to about φ25mm to achieve the effect of oil and liquid sealing, preventing the fuel vapor from being discharged from the oil filling pipe to the atmosphere. At the same time, the exhaust pipe is reduced to φ(2~3)mm under the action of the squeezing force to ensure the smooth refueling and reduce the workload of the carbon canister. Open the gas-liquid ratio regulating valve to the maximum, realize the automatic switch of the refueling gun through the trigger lifting mechanism and the crankshaft deceleration, and realize the cycle test of the refueling process. When the refueling volume reaches 15-20L, stop refueling, input the refueling volume of the refueling machine into the gas-liquid ratio test unit, and calculate the gas-liquid ratio of the refueling process according to the oil and gas volume detected by the oil and gas flowmeter 5. The measurement results are saved or not saved as needed.

[0083] If the gas-liquid ratio is greater than 1.2, the gas-liquid ratio of the ORVR-compatible fuel gun for refueling the National V vehicle is qualified, the gas-liquid ratio adjustment ability is normal, and the second and third tests can be carried out continuously. The average gas-liquid ratio will be displayed after the three tests; if the gas-liquid ratio is less than 0.5, the gas-liquid ratio of the ORVR-compatible fuel gun for refueling the National VI vehicle is qualified, the gas-liquid ratio adjustment ability is normal, and the second and third tests can be carried out continuously. The average gas-liquid ratio will be displayed after the three tests; if the gas-liquid ratio is greater than 0.5 and less than 1.2, it is determined that the gas-liquid ratio adjustment valve function of the ORVR-compatible fuel gun is invalid.

[0084] The present invention can automatically realize the continuous gas-liquid ratio test of the ORVR compatible refueling gun on the National Five and National Six fuel tanks. Before the test starts, a shorter refueling time N is set in the gas-liquid ratio test unit, the indication on the refueling machine is cleared, the refueling gun is turned on to start refueling with a high-speed flow rate first and a low-speed flow rate later, the oil pump is started, the oil and gas recovery system starts to start synchronously, the oil and gas recovery vacuum pump is started, and the oil product is pumped from the liquid storage tank through the refueling machine and the oil pipeline into the vehicle-mounted oil and gas recovery compatible oil and gas recovery refueling gun 1, and then the refueling gun passes through the adapter and the variable diameter oil pipe 3 to enter the vehicle tank 4. The tester detects the gas-liquid ratio of the ORVR oil gun corresponding to the National Five oil tank through the gas-liquid ratio test unit. When refueling to the preset refueling time N, the air pump 2 is automatically started, the variable diameter oil pipe 3 is in a tight state, and the gas-liquid ratio test unit automatically calculates the gas-liquid ratio of the ORVR oil gun corresponding to the National Six oil tank. When the preset refueling time 2N is reached again, the air pump 2 is turned off, the variable diameter oil pipe 3 is in a relaxed state, and the gas-liquid ratio test unit automatically recalculates the gas-liquid ratio of the ORVR oil gun corresponding to the National Five oil tank. By repeating the above operation, the gas-liquid ratio automatic cycle test can be realized when the ORVR-compatible fueling gun is refueling the fuel tanks of two types of vehicles without removing the gun, and the service life of the induction valve of the vehicle-mounted oil and gas recovery fueling gun can be determined.

[0085] In summary, the system described in the present invention can realize the gas-liquid ratio test function when different brands and models of ORVR compatible fueling guns are refueling National V and National VI vehicles at the gas station. The system completes the oil liquid seal, flow rate adjustment and oil supply of the on-board oil and gas compatible fueling gun test tooling through parameter control and refueling pipe diameter change. Different gas-liquid ratios are set according to whether different models have on-board oil and gas recovery systems to meet the oil and gas recovery requirements of the fuel tanks of National V and National VI models. The data acquisition and display function is used to realize the statistics of the gas-liquid ratio parameters of the ORVR fuel gun refueling. The characteristics of portability, integration, and high accuracy provide a basis for the gas-liquid ratio calibration of on-board oil and gas recovery compatible fueling guns in different application scenarios.

[0086] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A gas-to-liquid ratio test system for a fuel gun compatible with a vehicle-mounted oil and gas recovery system, characterized in that: The system includes: A refueling unit, the refueling unit comprising a variable diameter oil pipe (3) and an air pump (2), the variable diameter oil pipe (3) having a double-layer structure and an air bag formed by the two-layer structure, the air pump (2) being capable of inflating and deflating the air bag, and when refueling, the oil inlet end of the variable diameter oil pipe (3) is connected to a refueling gun (1), and the oil outlet end is connected to a vehicle oil tank (4); A gas-liquid ratio testing unit, used for testing the gas-liquid ratio in the refueling gun (1) during refueling; and A control unit, wherein the control unit is configured to: when it is determined that the refueling vehicle does not have an on-board oil and gas recovery system, shut down the air pump (2); when it is determined that the refueling vehicle has an on-board oil and gas recovery system, start the air pump (2) to inflate the air bag, thereby reducing the refueling pipe diameter of the variable diameter oil pipe (3).

2. The system according to claim 1, characterized in that The double-layer structure of the variable diameter oil pipe (3) comprises a metal outer layer and a rubber inner layer.

3. The system according to claim 1 or 2, characterized in that: The variable diameter oil pipe (3) also has a hose connected to the automobile oil tank. The hose has a five-layer structure. The materials from the inner layer to the outer layer are nitrile rubber, hydrogenated nitrile rubber, fluororubber, a polymer of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride, and chlorosulfonated polyethylene.

4. The system according to claim 1 or 2, characterized in that: The gas-liquid ratio testing unit comprises an oil-gas flow meter (5), and the oil-gas flow meter (5) is connected to a close-fitting adapter installed at the nozzle of the refueling gun (1).

5. The system according to claim 4, characterized in that The gas-liquid ratio testing unit further comprises a calculation module, which is configured to calculate the gas-liquid ratio based on the oil and gas volume obtained by the oil and gas flow meter (5) and the refueling volume provided by the refueling device that delivers gasoline to the refueling gun (1).

6. The system according to claim 4, characterized in that The oil and gas flow meter (5) is a Roots flow meter.

7. The system according to any one of claims 1 to 6, characterized in that: The system also includes a data acquisition and display unit for acquiring, displaying and storing various parameters during the refueling process, including: refueling volume, oil and gas volume, air pump status, detection time, gas-liquid ratio, real-time refueling flow rate, real-time return gas flow rate and real-time gas-liquid ratio.

8. A method for testing the gas-to-liquid ratio of a fuel gun compatible with a vehicle-mounted oil and gas recovery system, characterized in that: The method is operated by using the vehicle-mounted oil and gas recovery system compatible fueling gun gas-liquid ratio testing system according to any one of claims 1 to 7, and the method comprises: Connecting the variable diameter oil pipe (3) to the vehicle oil tank (4), and refueling through the refueling gun (1); When the system determines that the refueling vehicle does not have an on-board oil and gas recovery system, the air pump (2) is turned off, the air bag of the variable diameter oil pipe (3) is not inflated, and the inner tube of the variable diameter oil pipe (3) is in a relaxed state; when the system determines that the refueling vehicle has an on-board oil and gas recovery system, the air pump (2) is turned on to inflate the air bag, so that the inner tube of the variable diameter oil pipe (3) is in a taut state; The oil and gas volume in the refueling gun (1) is detected during refueling, and the gas-liquid ratio of the refueling gun is determined according to the refueling volume of the refueling gun (1).

9. The method according to claim 8, characterized in that The method further comprises: comparing the gas-liquid ratio detection value with a preset gas-liquid ratio value to determine whether the gas-liquid ratio regulating valve function of the refueling gun (1) is effective.

10. The method according to claim 9, characterized in that The process of judging whether the gas-liquid ratio regulating valve function of the refueling gun (1) is effective comprises: When the refueling vehicle does not have an on-board oil and gas recovery system, if the gas-liquid ratio detection value is greater than or equal to 1.2, it is determined that the gas-liquid ratio regulating valve function of the refueling gun (1) is effective; When the refueling vehicle is equipped with an on-board oil and gas recovery system, if the gas-liquid ratio detection value is less than or equal to 0.5, it is determined that the gas-liquid ratio regulating valve function of the refueling gun (1) is effective; If the gas-liquid ratio detection value is greater than 0.5 and less than 1.2, it is determined that the gas-liquid ratio regulating valve of the fueling gun (1) has failed in function.

11. The method according to any one of claims 8 to 10, characterized in that: The method further comprises: when the system determines that the refueling vehicle does not have an on-board oil and gas recovery system, setting the gas-liquid ratio of the refueling gun (1) to 1-1.2; When the system determines that the refueling vehicle is equipped with an on-board oil and gas recovery system, the gas-liquid ratio of the refueling gun (1) is set to be less than 0.5.

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