Oil gas recovery detector and recovery method

Abstract

The invention relates to the field of oil gas detection, and particularly discloses an oil gas recovery detector and a recovery method.The oil gas recovery detector comprises a metering barrel and further comprises an oil inlet pipe capable of being detachably connected with the end of an oil gun in a sealed mode, and the oil inlet pipe communicates with the upper end of the metering barrel; an air pressure detector; a gas flow meter; one end of the oil gas return pipe is communicated with the upper end of the metering barrel, the other end of the oil gas return pipe is communicated with the middle of the oil inlet pipe, and the gas pressure detector and the gas flowmeter are installed on the oil gas return pipe; the oil collecting tank can be communicated with the metering barrel; and the oil and gas recovery box can be communicated with the metering barrel and can also be communicated with the oil collection tank, and an oil and gas recovery processing unit is arranged in the oil and gas recovery box. According to the scheme, the oil gas recovery box can be matched with the oil gas recovery processing unit, oil gas in the metering barrel, the oil inlet pipe and the oil gas return pipe is recovered, and the influence of the amount of residual gasoline in the metering barrel on the next oil gun detection precision can be obviously reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas detection, and in particular to an oil and gas recovery detection instrument and a recovery method. Background Art

[0002] Gasoline is a volatile, flammable hydrocarbon mixture liquid distilled and cracked from petroleum. Its physical and chemical properties, uses and preparation methods are extremely rich and diverse. Among them, being the main power fuel for transportation is the most well-known application scenario. Since the boiling range of gasoline is generally (30-205)℃, in the daily operation of gas stations, volatile organic compounds (VOCs) in gasoline are easily dispersed into the air, and oil and air can form an explosive mixture. It is very easy to burn and explode when exposed to open flames and high heat, affecting the safety of gas stations and easily causing air pollution.

[0003] Therefore, in the daily maintenance of gas stations, oil and gas detection is often carried out on various key components of the oil and gas recovery system, such as gas pumps, oil and gas recovery pipelines, oil storage tanks and other structures. The purpose is to ensure that the oil and gas content in the output gasoline remains normal, to ensure the normal transportation of gasoline, and at the same time reduce environmental pollution and improve safety. Among them, when performing oil and gas detection on the gas pump, an oil and gas detector is generally used to simulate the transportation and then detect the oil and gas input to the gas pump. After the detection, some gasoline is likely to remain in the oil barrel, resulting in difficulty in obtaining accurate oil and gas data when measuring the remaining gas pumps again or repeatedly measuring the oil and gas of a single gas pump, which will affect the detection accuracy of the gas pump. At the same time, when recovering the gasoline in the oil and gas, the gasoline in the oil and gas is difficult to separate and recover efficiently, and this part of the gasoline is also prone to overflow and waste during the suction process. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an oil and gas recovery detector and a recovery method to solve the problem that some gasoline is easily left in the oil barrel after detection, resulting in difficulty in obtaining accurate oil and gas data when measuring the remaining refueling guns again or repeatedly measuring the oil and gas of a single refueling gun.

[0005] In order to achieve the above object, the basic scheme of the present invention is as follows: an oil and gas recovery detector includes a metering barrel and also includes:

[0006] An oil inlet pipe which can be sealed and detachably connected to the end of the fueling gun, and the oil inlet pipe is connected to the upper end of the metering barrel;

[0007] Air pressure detector;

[0008] Gas flow meter;

[0009] An oil and gas return pipe, one end of which is connected to the upper end of the metering barrel, and the other end of which is connected to the middle of the oil inlet pipe. An air pressure detector and a gas flow meter are installed on the oil and gas return pipe to detect the air pressure and gas flow of the oil and gas in the oil and gas return pipe;

[0010] Oil collecting tank, which can be connected with the measuring barrel;

[0011] The oil and gas recovery box can be connected with the metering barrel, and the oil and gas recovery box can also be connected with the oil collecting tank. The oil and gas recovery box is equipped with an oil and gas recovery processing unit.

[0012] The technical principle of the present invention is: when testing the oil and gas in a refueling gun, the end of the refueling gun is inserted into the end of the oil inlet pipe, and the oil inlet pipe is sealed and connected to the end of the refueling gun; at this time, the air pressure detector and the gas flow meter obtain initial air pressure data and initial gas flow data; then the oil collecting tank and the oil and gas recovery box are disconnected from the metering barrel, the metering barrel, the oil and gas reflux pipe and the oil inlet pipe are closed, the refueling gun performs the refueling operation, and after a standard amount of gasoline is added to the metering barrel, the refueling of the refueling gun is stopped; in this process, the air pressure detector and the gas flow meter obtain the air pressure data and gas flow data after the test, and compare and calculate the initial air pressure data and the initial gas flow data with the air pressure data and the gas flow data after the test, so as to know whether the oil and gas in the refueling gun meets the standard.

[0013] After the inspection is completed, the metering barrel is connected to the oil collecting tank, and the gasoline in the metering barrel can be collected in the oil collecting tank; when the gasoline is collected, the metering barrel is disconnected from the oil collecting tank, and the metering barrel is connected to the oil and gas recovery box, and the oil and gas recovery box is connected to the oil collecting tank. The oil and gas recovery box can cooperate with the oil and gas recovery processing unit to recover the oil and gas in the metering barrel, the oil inlet pipe and the oil and gas return pipe, which can significantly reduce the impact of the amount of gasoline remaining in the metering barrel on the next gas gun detection accuracy, reduce the amount of oil and gas overflow, and also reduce pollution to the ambient air.

[0014] Furthermore, it also includes:

[0015] The longitudinal section of the mounting frame is "U", and the metering barrel, the oil and gas recovery box and the oil collecting tank are installed in sequence between the two ends of the mounting frame;

[0016] A connecting main pipe is vertically connected between the metering barrel and the oil collecting tank. A main control valve is arranged on one end of the connecting main pipe close to the metering barrel, and a first switch valve is arranged on one end of the connecting main pipe close to the oil collecting tank;

[0017] The connecting branch pipe is connected between the oil and gas recovery box and the connecting main pipe. The connecting point between the connecting branch pipe and the connecting main pipe is located between the main control valve and the first switch valve. The second switch valve is arranged on the connecting branch pipe.

[0018] Through the above-mentioned settings, the mounting frame can provide stable support for the installation of the metering barrel, oil and gas recovery box and oil collecting tank; the connecting main pipe and the connecting branch pipe can cooperate with the main control valve, the first switch valve and the second switch valve to realize the switching of the connecting status of the metering barrel, the oil collecting tank and the oil and gas recovery tank, thereby facilitating the collection of gasoline and the recovery of oil and gas.

[0019] Furthermore, a third switch valve is provided on the oil inlet pipe, and the third switch valve is located on the upper side of the connection point between the oil and gas return pipe and the oil inlet pipe.

[0020] Through the above arrangement, it is convenient to close the third switch valve and the main control valve after refueling with the refueling gun is completed, so that a closed state is formed between the metering barrel, the oil inlet pipe and the oil and gas return pipe, which makes it convenient for the oil and gas entering the metering barrel from the refueling gun to circulate between the metering barrel, the oil inlet pipe and the oil and gas return pipe to form flowing oil and gas, making it convenient for the air pressure detector and the gas flow meter to obtain accurate data.

[0021] Further, the mounting frame comprises:

[0022] Two "L"-shaped vertical connecting sections, the side walls of the two vertical connecting sections are fixedly connected to the side walls of the oil and gas recovery box, and a mounting plate is fixedly arranged horizontally at the upper ends of the two vertical connecting sections, and the metering barrel is fixedly installed on the mounting plate;

[0023] A horizontal section is located between the lower ends of the two vertical connection sections, the upper side of the horizontal section is fixedly connected to the oil collecting tank, and the two sides of the horizontal section are spliced ​​and connected with the end faces of the lower ends of the two vertical connection sections;

[0024] Rollers are arranged on the lower surfaces of the vertical connecting section and the horizontal section.

[0025] Through the above arrangement, the rollers can provide stable support for the vertical connecting section and the horizontal section, and facilitate the movement of the oil and gas recovery detector; through the splicing and card connection between the vertical connecting section and the horizontal section, the horizontal section can be separated from the vertical connecting section, thereby driving the oil collecting tank to separate from the connecting main pipe and the oil and gas recovery box, making it convenient for the oil collecting tank to perform independent oil unloading operations, without the need to move the oil and gas recovery detector as a whole, making the independent movement and oil unloading of the oil collecting tank more labor-saving.

[0026] Furthermore, a first oil inlet connected to the connecting main pipe and a second oil inlet connected to the oil and gas recovery tank are provided at the upper side of the oil collecting tank;

[0027] A first truncated cone-shaped elastic connecting head is fixedly arranged on the lower end of the connecting main pipe, and the first elastic connecting head can be sealed and fitted with the side wall of the first oil inlet of the oil collecting tank;

[0028] A second elastic connecting head is fixedly arranged on the lower side of the oil and gas recovery box, the second elastic connecting head is connected to the oil and gas recovery box, and the second elastic connecting head can be sealed and fitted with the side wall of the second oil inlet of the oil collecting tank.

[0029] Through the above arrangement, when the oil collecting tank is separated from the connecting main pipe and the oil and gas recovery box, the first elastic connecting head is deformed and separated from the first oil inlet, and the second elastic connecting head is deformed and separated from the second oil inlet. The same operation is performed when connecting the oil collecting tank, the connecting main pipe and the oil and gas recovery box, so that the disassembly and assembly between the oil collecting tank, the connecting main pipe and the oil and gas recovery box are convenient.

[0030] Furthermore, the oil and gas recovery processing unit includes:

[0031] The oil and gas cooling plate is vertically fixedly installed in the oil and gas recovery box, the oil and gas cooling plate covers the longitudinal section of the oil and gas recovery box and is directly opposite to the end of the connecting branch pipe away from the connecting main pipe, the second elastic connecting head is located between the oil and gas cooling plate and the connecting branch pipe, and a plurality of first vent holes are horizontally penetrated on the oil and gas cooling plate;

[0032] A suction pump, the suction pump is fixedly connected to an end of the oil and gas recovery tank away from the connecting branch pipe, and an air outlet pipe is provided on the suction pump;

[0033] A plurality of flexible oil absorption filter layers, the circumference of the oil absorption filter layers is wrapped with a limited steel sheet, and the plurality of oil absorption filter layers are all located in the oil and gas recovery box and between the oil and gas cooling plate and the suction pump;

[0034] A plurality of limit slide rails, the limit slide rails are fixedly installed horizontally in the oil and gas recovery box, and the axis of the limit slide rails is perpendicular to the surface of the oil and gas cooling plate, and the outer wall of the limit steel sheet is horizontally slidably connected to the limit slide rails;

[0035] A pressing plate, the pressing plate is vertically arranged in the oil and gas recovery box, the pressing plate is located between a plurality of oil absorption filter layers and a suction pump, and a plurality of second vent holes are horizontally penetrated on the pressing plate;

[0036] A telescopic rod, one end of which is fixedly connected to a side of the pressing plate away from the plurality of oil absorption filter layers, and the other end of which passes through the oil and gas recovery box and is located outside the oil and gas recovery box;

[0037] A hydraulic pump for controlling the extension and retraction of the telescopic rod, and a hydraulic pump and a suction pump are both fixedly installed on the outer wall of the oil and gas recovery box.

[0038] Through the above arrangement, when the oil and gas are recovered, the suction pump is turned on, and the negative pressure of the suction pump passes through the second air vent on the pressing plate, several oil absorption filter layers, the first air vent on the oil and gas cooling plate, the connecting branch pipe and the connecting main pipe in sequence, and then is transmitted to the oil and gas return pipe; under the action of negative pressure, the airflow entering the oil and gas return pipe, the oil and gas return pipe and the metering barrel from the connecting pipe can carry the oil and gas into the oil and gas recovery box through the connecting main pipe and the connecting branch pipe, the oil and gas cooling plate contacts the oil and gas in the airflow, and then condenses the oil and gas, and part of the oil and gas adheres to the surface of the oil and gas cooling plate to form gasoline, and the oil and gas cooling plate guides the gasoline to the second The elastic connecting head allows gasoline to enter the oil collecting tank; the other part of the oil and gas impacts the several oil absorption filter layers through the first vent hole of the oil and gas cooling plate. When the oil and gas pass through the several oil absorption filter layers, they can be absorbed by the several oil absorption filter layers in sequence. When more gasoline is absorbed on the several oil absorption filter layers, the hydraulic pump controls the extension of the telescopic rod, and the telescopic rod pushes the pressing plate to press the several oil absorption filter layers tightly against the oil and gas cooling plate. The gasoline in the oil absorption filter layers overflows to form reflux gasoline, and the reflux gasoline flows back to the oil collecting tank through the second elastic connecting head, so as to realize the full recovery of oil and gas, reduce the overflow of oil and gas, and reduce the pollution to the air environment.

[0039] Furthermore, the oil and gas recovery processing unit also includes:

[0040] A plurality of shunt pipes, one end of each of which is connected to the air outlet pipe;

[0041] The oil and gas adsorption box is detachably connected to the end of the air outlet pipe. The oil and gas adsorption box contains washing liquid that absorbs oil and gas or reacts with oil and gas. The end of the diversion pipe away from the air outlet pipe is located below the liquid level of the washing liquid.

[0042] The metering barrel, the oil inlet pipe, the oil and gas return pipe, the oil collecting tank, the oil and gas recovery box, the connecting main pipe and the connecting branch pipe are all coated with an oleophobic layer.

[0043] Through the above arrangement, the excess airflow passes through the second air vent on the pressing plate and then flows out from the air outlet pipe. At this time, the diversion pipe on the air outlet pipe can divert the oil and gas in the airflow, so that the oil and gas in the airflow can fully contact with the washing liquid in the oil and gas adsorption box, thereby fully removing the oil and gas in the airflow and reducing the amount of oil and gas overflow.

[0044] Furthermore, a control unit is included, and the control unit includes:

[0045] PLC controller;

[0046] A liquid level sensor for detecting the amount of gasoline in the metering barrel;

[0047] The main control valve, the first switch valve, the second switch valve and the third switch valve are all electromagnetic switch valves;

[0048] A vibrator is installed on the outer wall of the metering barrel;

[0049] A first controller for controlling the oil and gas cooling plate to be turned on or off; a second controller for controlling the suction pump to be turned on or off; a third controller for controlling the hydraulic pump to be turned on or off; a fourth controller for controlling the vibrator to be turned on or off;

[0050] The liquid level sensor, the main control valve, the first switch valve, the second switch valve, the third switch valve, the first controller, the second controller, the third controller, the fourth controller, the air pressure detector and the gas flow meter are all connected to the PLC controller via electrical signals.

[0051] Through the above settings, the PLC controller can cooperate with the oil and gas detection and recovery steps to control the liquid level sensor, the main control valve, the first switch valve, the second switch valve, the third switch valve, the first controller, the second controller, the third controller, the fourth controller, the air pressure detector and the gas flow meter, so as to facilitate the accurate detection and full recovery of oil and gas; when recovering gasoline and oil and gas, the vibrator can be started synchronously, so that the gasoline adhered to the metering barrel, the oil inlet pipe and the oil and gas return pipe can be fully separated, so as to achieve full recovery of gasoline and oil and gas.

[0052] The present invention also intends to provide an oil and gas detection and recovery method, including an oil and gas recovery detector, and further comprising the following steps:

[0053] The PLC controller controls the third switch valve to open and the main control valve, the first switch valve and the second switch valve to close;

[0054] The end of the refueling gun is embedded in the oil inlet pipe, and the end of the refueling gun is sealed by the oil inlet pipe;

[0055] The air pressure detector measures and obtains the initial air pressure data X1kPa at the oil inlet pipe; the gas flow meter measures and obtains the initial gas flow data A1L / min at the oil inlet pipe;

[0056] The refueling gun performs refueling operation, and the liquid level sensor detects the amount of gasoline in the metering barrel in real time. When the liquid level measured by the liquid level sensor reaches the standard liquid level Bcm, the refueling operation of the refueling gun is stopped, and the PLC controller controls the third switch valve to close; the air pressure detector measures the air pressure data X2kPa at the oil inlet pipe; the gas flow meter measures the gas flow data A2L / min at the oil inlet pipe;

[0057] The PLC controller determines whether the oil and gas volume meets the standards:

[0058]

[0059] θ1 is the gas-liquid ratio when refueling in the refueling gun; h is the time required for the initial gas flow data A1L / min to change to the gas flow data A2L / min, and S is the cross-sectional area of ​​the inner wall of the metering barrel in cm 2 ;

[0060]

[0061] θ2 is the gas-liquid ratio when refueling in the refueling gun; n is the amount of gas, R is the molar gas constant; T is the temperature;

[0062]

[0063] When the value of δ is between (1 and 1.2), the oil and gas volume of the fuel gun meets the standard; when δ is not between (1 and 1.2), the oil and gas volume of the fuel gun does not meet the standard;

[0064] When the air pressure data X2kPa is maintained for more than 1 minute, the PLC controller controls the third switch valve, the main control valve and the first switch valve to open, and the gasoline flows back to the oil collecting tank through the connecting pipe; the PLC controller controls the vibrator to start;

[0065] When the vibrator is turned on for (5-10) minutes, the PLC controller controls the first switch valve to close, the PLC controller controls the second switch valve, the oil and gas cooling plate and the suction pump to open, the oil and gas recovery box sucks and recovers the oil and gas in the metering barrel, the oil and gas cooling plate cools the oil and gas, and the oil absorption filter layer absorbs and collects the oil and gas;

[0066] The PLC controller controls the hydraulic pump to start, controls the telescopic rod to extend, and pushes the pressing plate to press a number of oil absorption filter layers against the oil and gas cooling plate. The gasoline overflowing from the oil absorption filter layer forms reflux gasoline, and the reflux gasoline flows back to the oil collecting tank through the second elastic connecting head.

[0067] The oil and gas discharged from the air outlet pipe enters the oil and gas adsorption box through several branch pipes, and the washing liquid in the oil and gas adsorption box adsorbs or reacts to remove the oil and gas.

[0068] The technical principle of the present invention is: when judging whether the amount of oil and gas meets the standard, the air pressure data and the gas flow data are used to respectively obtain the gas-liquid ratios θ1 and θ2 when refueling in the refueling gun. Whether the data difference between θ1 and θ2 is large can be comprehensively compared to judge whether the detection process is normal. When the data difference between θ1 and θ2 is not large, the values ​​of θ1 and θ2 can be averaged to obtain the δ value, which is convenient for comparison with the standard value range (1 to 1.2). Whether the amount of oil and gas in the refueling gun meets the standard can be conveniently and accurately judged. The entire detection and judgment process is convenient, simple to operate and efficient.

[0069] In the process of recovering gasoline and oil vapor, the oil vapor recovery detector can fully and efficiently complete the recovery of gasoline and oil vapor under the control of the PLC controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 It is a schematic structural diagram of an oil and gas recovery detector in the axial direction in an embodiment of the present invention.

[0071] Figure 2 It is a schematic structural diagram of an oil and gas recovery detector in the axial direction in an embodiment of the present invention.

[0072] Figure 3 It is a structural schematic diagram of an oil and gas recovery detector in the main viewing direction in an embodiment of the present invention.

[0073] Figure 4 for Figure 3 This is the cross-sectional view at AA.

[0074] In the above drawings: metering barrel 10, vibrator 11, oil inlet pipe 101, air pressure detector 102, gas flow meter 103, oil and gas return pipe 104, oil collecting tank 20, first oil inlet 201, second oil inlet 202, oil and gas recovery box 30, second elastic connecting head 301, vertical connecting section 401, horizontal section 402, mounting plate 403, roller 404, connecting main pipe 50, first elastic connecting head 501, connecting branch pipe 502, main control valve 601, first switch valve 602, second switch valve 603, the third switch valve 604, the oil and gas cooling plate 701, the first air vent 711, the refrigeration pipe 721, the suction pump 702, the air outlet pipe 703, the oil absorption filter layer 704, the limiting steel sheet 705, the limiting slide rail 706, the pressing plate 707, the second air vent 717, the telescopic rod 708, the hydraulic pump 709, the oil and gas adsorption box 80, the shunt pipe 801, the nut 802, the data display 901, the connecting pipe 902, the filter screen 903, the oil outlet pump 904, the oil outlet pipe 905, and the handle 906. DETAILED DESCRIPTION

[0075] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0076] This embodiment is basically Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the embodiment of the present invention proposes an oil and gas recovery detector, including a metering barrel 10, an oil inlet pipe 101 that can be sealed and detachably connected to the end of a refueling gun, a gas pressure detector 102, a gas flow meter 103, an oil and gas return pipe 104, an oil collecting tank 20, an oil and gas recovery box 30, a mounting frame with a "U" longitudinal section, a connecting main pipe 50, a connecting branch pipe 502, and a control unit; Figure 1As shown, the metering barrel 10, the oil and gas recovery box 30 and the oil collecting tank 20 are sequentially installed between the two ends of the mounting frame, and the oil and gas recovery box 30 is provided with an oil and gas recovery processing unit; wherein the mounting frame includes two "L"-shaped vertical connecting sections 401 and a horizontal section 402 located between the lower ends of the two vertical connecting sections 401, the side walls of the two vertical connecting sections 401 are fixedly connected to the side walls of the oil and gas recovery box 30 by bolts, and the upper ends of the two vertical connecting sections 401 are horizontally fixed with a mounting plate 40 3. The metering barrel 10 is fixedly mounted on the mounting plate 403 by bolts; at the same time, the upper side of the horizontal section 402 is fixedly connected to the oil collecting tank 20 by screws, and the two sides of the horizontal section 402 are spliced ​​and connected with the end faces of the lower ends of the two vertical connecting sections 401, and the end faces of the lower ends of the vertical connecting sections 401 are in a step shape spliced ​​with the two sides of the horizontal section 402, so that the horizontal section 402 and the vertical connecting section 401 can be spliced ​​and abutted against each other, and rollers 404 are provided on the lower surfaces of the vertical connecting sections 401 and the horizontal section 402.

[0077] like Figure 1-4 As shown, the oil inlet pipe 101 is connected to the center of the upper end of the metering barrel 10; the outline of the oil and gas return pipe 104 in the top view is in the shape of a "7", the lower end of the oil and gas return pipe 104 is connected to the upper end of the metering barrel 10, and the upper end of the oil and gas return pipe 104 is connected to the middle part of the oil inlet pipe 101, and the air pressure detector 102 and the gas flow meter 103 are installed on the lower end of the oil and gas return pipe 104 to detect the air pressure and gas flow of the oil and gas in the oil and gas return pipe 104.

[0078] like Figure 1-3As shown, the connecting main pipe 50 is vertically connected between the metering barrel 10 and the oil collecting tank 20, and a main control valve 601 is provided on one end of the connecting main pipe 50 close to the metering barrel 10, and a first switch valve 602 is provided on one end of the connecting main pipe 50 close to the oil collecting tank 20; the connecting branch pipe 502 is connected between the oil and gas recovery tank 30 and the connecting main pipe 50, and the connecting point between the connecting branch pipe 502 and the connecting main pipe 50 is located between the main control valve 601 and the first switch valve 602, and a second switch valve 603 is provided on the connecting branch pipe 502; a first oil inlet 201 connected to the connecting main pipe 50 and a second oil inlet 202 connected to the oil and gas recovery tank 30 are provided on the upper side of the oil collecting tank 20; a truncated cone-shaped first elastic connecting head 50 is fixedly provided on the lower end of the connecting main pipe 50 1. The first elastic connecting head 501 can be sealed and fitted with the side wall of the first oil inlet 201 of the oil collecting tank 20. A second elastic connecting head 301 is fixedly arranged on the lower side of the oil and gas recovery box 30. The second elastic connecting head 301 is connected with the oil and gas recovery box 30. The second elastic connecting head 301 can be sealed and fitted with the side wall of the second oil inlet 202 of the oil collecting tank 20. The first elastic connecting head 501 and the second elastic connecting head 301 are both made of silicone, and the cross-sections of the second oil inlet 202 and then the second elastic connecting head 301 are strip-shaped. The strip-shaped second elastic connecting head 301 is arranged along the width direction of the oil and gas recovery box 30, so that the gasoline in the oil and gas recovery box 30 can quickly flow back to the oil collecting tank 20 along the strip-shaped second elastic connecting head 301.

[0079] Meanwhile, a third switch valve 604 is provided on the oil inlet pipe 101 , and the third switch valve 604 is located at the upper side of the connection point between the oil and gas return pipe 104 and the oil inlet pipe 101 .

[0080] like Figure 1-4 As shown, the oil and gas recovery processing unit includes an oil and gas cooling plate 701, a suction pump 702, a plurality of flexible oil absorption filter layers 704, two limit slide rails 706, a pressing plate 707, a telescopic rod 708, a hydraulic pump 709 for controlling the telescopic rod 708, a plurality of shunt pipes 801 and an oil and gas adsorption box 80. The oil and gas cooling plate 701 is vertically fixedly installed in the oil and gas recovery box 30. The oil and gas cooling plate 701 covers the longitudinal section of the oil and gas recovery box 30 and is directly opposite to the end of the connecting branch pipe 502 away from the connecting main pipe 50. The second elastic connecting head 301 is located between the oil and gas cooling plate 701 and the connecting branch pipe 502. A plurality of first vents 711 are horizontally penetrated on the oil and gas cooling plate 701. A plurality of refrigeration pipes 721 are wound in the oil and gas cooling plate 701. The refrigeration pipes 721 are also surrounded by the first vents 711, and the refrigeration pipes 721 are all connected to the refrigerator. Figure 2 As shown, the suction pump 702 is fixedly connected to the center of the left end of the oil and gas recovery box 30, and a vertical downward air outlet pipe 703 is provided on the suction pump 702.

[0081] At the same time, if Figure 4As shown, the oil absorption filter layer 704 is circumferentially wrapped with a limiting steel sheet 705, and the oil absorption filter layer 704 is a high oil absorption resin filter layer. The plurality of oil absorption filter layers 704 are located in the oil and gas recovery box 30 and between the oil and gas cooling plate 701 and the suction pump 702; the limiting slide rail 706 is horizontally fixedly installed in the oil and gas recovery box 30, and the axis of the limiting slide rail 706 is perpendicular to the surface of the oil and gas cooling plate 701, and the outer wall of the limiting steel sheet 705 is horizontally slidably connected to the limiting slide rail 706; the pressing plate 70 7 is vertically arranged in the oil and gas recovery box 30, the pressing plate 707 is located between the plurality of oil absorption filter layers 704 and the suction pump 702, and the pressing plate 707 is horizontally penetrated with a plurality of second vent holes 717; one end of the telescopic rod 708 is fixedly connected to a side of the pressing plate 707 away from the plurality of oil absorption filter layers 704, and the other end of the telescopic rod 708 passes through the oil and gas recovery box 30 and is located outside the oil and gas recovery box 30; the hydraulic pump 709 and the suction pump 702 are both fixedly installed on the outer wall of the oil and gas recovery box 30.

[0082] like Figure 2 As shown, one end of the shunt pipe 801 is connected to the lower end of the air outlet pipe 703; a nut 802 is rotatably installed on the upper side of the oil and gas adsorption box 80, and the nut 802 is threadedly connected to the lower end of the air outlet pipe 703. The oil and gas adsorption box 80 contains washing liquid that absorbs oil and gas or reacts with oil and gas, and one end of the shunt pipe 801 away from the air outlet pipe 703 is located below the liquid level of the washing liquid.

[0083] In addition, the metering barrel 10, the oil inlet pipe 101, the oil and gas return pipe 104, the oil collecting tank 20, the oil and gas recovery box 30, the connecting main pipe 50 and the connecting branch pipe 502 are all coated with an oleophobic layer, and the oleophobic layer is made of a super oleophobic material prepared from brucite-organosilane.

[0084] The control unit includes a PLC controller, a data display 901, a liquid level sensor for detecting the amount of gasoline in the metering barrel 10, a vibrator 11, a first controller for controlling the oil and gas cooling plate 701 to be turned on or off, a second controller for controlling the suction pump 702 to be turned on or off, a third controller for controlling the hydraulic pump 709 to be turned on or off, and a fourth controller for controlling the vibrator 11 to be turned on or off; the vibrator 11 is annular, and the vibrator 11 is fixedly installed at the upper end of the outer wall of the metering barrel 10; the main control valve 601, the first switch valve 602, the second switch valve 603 and the third switch valve 604 are all electromagnetic switch valves; at the same time, the data display 901, the liquid level sensor, the main control valve 601, the first switch valve 602, the second switch valve 603, the third switch valve 604, the first controller, the second controller, the third controller, the fourth controller, the air pressure detector 102 and the gas flow meter 103 are all electrically connected to the PLC controller. The data display 901 is fixedly installed at the upper end of the vertical connecting section 401, and a control signal input terminal electrically connected to the PLC controller is provided on the side of the data display 901.

[0085] In addition, the upper end of the oil inlet pipe 101 is bent, and an annular sealing block is provided on the inner wall of the oil inlet pipe 101, which is tightly pressed against the end of the oil filling gun; at the same time, a truncated cone-shaped connecting pipe 902 is detachably installed at the upper end of the oil inlet pipe 101, and the end of the connecting pipe 902 with a smaller diameter can be embedded in and pressed against the annular sealing block, and a filter screen 903 is fixedly bonded to the end of the connecting pipe 902 with a larger diameter, and a cooling water absorption layer is provided inside the filter screen 903.

[0086] like Figure 1 , 2 As shown in 4, an oil pump 904 is connected to the lower center of the right side of the oil collecting tank 20, and an oil outlet pipe 905 is connected to the oil outlet pump 904. The bottom surface of the inner wall of the oil collecting tank 20 is inclined, and the bottom surface of the inner wall of the oil collecting tank 20 is lowest on the side close to the oil outlet pump 904. A handle 906 is hinged on the side of the horizontal section 402 away from the oil outlet pump 904.

[0087] When the oil and gas recovery detector in this embodiment is used to detect oil and gas in the refueling gun and recover gasoline and oil and gas, an oil and gas detection and recovery method is used. The oil and gas recovery detector in this embodiment is used in the method, and the method also includes the following steps:

[0088] A control signal is input to the PLC controller through the control signal input terminal, so that the PLC controller controls the third switch valve 604 to open and the main control valve 601, the first switch valve 602 and the second switch valve 603 to close;

[0089] The end of the refueling gun is embedded in the oil inlet pipe 101, and the end of the refueling gun is sealed by the annular sealing block of the oil inlet pipe 101, so that the metering barrel 10, the oil inlet pipe 101, the oil and gas return pipe 104 and the refueling gun are in a sealed state, which is convenient for subsequent oil inlet detection;

[0090] The air pressure detector 102 measures and obtains the initial air pressure data X1 kPa at the oil inlet pipe 101; the gas flow meter 103 measures and obtains the initial gas flow data A1 L / min at the oil inlet pipe 101;

[0091] The refueling gun performs the refueling operation, and the liquid level sensor detects the amount of gasoline in the metering barrel 10 in real time. When the liquid level measured by the liquid level sensor reaches the standard liquid level Bcm required for the oil and gas measurement of the refueling gun, the refueling operation of the refueling gun is stopped, and the PLC controller controls the third switch valve 604 to close, so that a closed state is formed between the metering barrel 10, the oil inlet pipe 101 and the oil and gas return pipe 104, so that the oil and gas entering the metering barrel 10 from the refueling gun circulate between the metering barrel 10, the oil inlet pipe 101 and the oil and gas return pipe 104 to form flowing oil and gas; in this process, the air pressure detector 102 measures and obtains the air pressure data X2kPa at the oil inlet pipe 101 (the air pressure data X2kPa is maintained for 1 minute or more); the gas flow meter 103 measures and obtains the gas flow data A2L / min at the oil inlet pipe 101;

[0092] The PLC controller determines whether the oil and gas volume meets the standards:

[0093]

[0094] θ1 is the gas-liquid ratio when refueling in the refueling gun; h is the time required for the initial gas flow data A1L / min to change to the gas flow data A2L / min, and S is the cross-sectional area of ​​the inner wall of the metering barrel in cm 2 ;

[0095]

[0096] θ2 is the gas-liquid ratio when refueling in the refueling gun; n is the amount of gas, R is the molar gas constant; T is the temperature;

[0097]

[0098] When the value of δ is between (1 and 1.2), the oil and gas volume of the fuel gun meets the standard; when δ is not between (1 and 1.2), the oil and gas volume of the fuel gun does not meet the standard; X1kPa, A1L / min, Bcm, X2kPa, A2L / min, θ1, θ2 and δ data can all be displayed on the data display, which is convenient for the test personnel to check the results and whether each data is normal;

[0099] When the air pressure data X2kPa is maintained for more than 1min, the detection of the oil and gas in the refueling gun is completed, and the subsequent gasoline and oil and gas recovery process is carried out. The PLC controller controls the third switch valve 604, the main control valve 601 and the first switch valve 602 to open, and the metering barrel 10 is connected to the oil collecting tank 20 through the connecting pipe 50. The gasoline flows back to the oil collecting tank 20 through the connecting pipe 50 to realize the recovery of gasoline; in this process, the PLC controller controls the vibrator 11 to open, and the oleophobic layer on the inner wall of the metering barrel 10, the oil inlet pipe 101, the oil and gas return pipe 104, the oil collecting tank 20, the oil and gas recovery box 30 and the connecting pipe 50 can prevent the adhesion of a large amount of gasoline. The vibrator 11 cooperates with the oleophobic layer to effectively reduce the residual amount of gasoline on the metering barrel 10, the oil inlet pipe 101, the oil and gas return pipe 104, the oil collecting tank 20, the oil and gas recovery box 30 and the connecting pipe 50, and can also reduce the residual amount of oil and gas in the original metering barrel 10;

[0100] After the vibrator 11 is turned on for 7 minutes, the PLC controller controls the first switch valve 602 to close, and the PLC controller controls the second switch valve 603, the oil and gas cooling plate 701 and the suction pump 702 to open, and the connecting pipe 902 is installed on the end of the oil inlet pipe 101, and the end of the connecting pipe 902 is tightly pressed against the annular sealing block; the vibrator 11 is continuously turned on, and the negative pressure of the suction pump 702 passes through the second vent 717 on the pressing plate 707, a plurality of oil absorption filter layers 704, the first vent 711 of the oil and gas cooling plate 701, the connecting branch pipe 502 and the connecting main pipe 50 in turn, and is transmitted to the oil and gas return pipe 104 and the connecting pipe 902. The filter net 903 on the connecting pipe 902 can block external dust and impurities, and the cooling water absorption layer in the filter net 903 can absorb most of the moisture in the air to prevent the moisture from being cooled by the oil and gas cooling plate 701 and then adhering to a plurality of oil absorption filter layers 704;

[0101] Under the action of negative pressure, the airflow entering the oil and gas return pipe 104, the oil and gas return pipe 104 and the metering barrel 10 from the connecting pipe 902 can carry the oil and gas through the connecting main pipe 50 and the connecting branch pipe 502 into the oil and gas recovery box 30, and the oil and gas cooling plate 701 is maintained at (0-10)°C. The oil and gas cooling plate 701 contacts the oil and gas in the airflow, and then condenses the oil and gas. Part of the oil and gas adheres to the surface of the oil and gas cooling plate 701 to form gasoline. The oil and gas cooling plate 701 guides the gasoline to the second elastic connecting head 301, so that the gasoline enters the oil collecting tank 20;

[0102] Another part of the oil and gas impacts the plurality of oil absorption filter layers 704 through the first vent hole 711 of the oil and gas cooling plate 701. When the oil and gas pass through the plurality of oil absorption filter layers 704, they can be absorbed by the plurality of oil absorption filter layers 704 in sequence. When a large amount of gasoline is absorbed by the plurality of oil absorption filter layers 704, the PLC controller controls the hydraulic pump 709 to start, controls the telescopic rod 708 to extend and pushes the pressing plate 707 to press the plurality of oil absorption filter layers 704 against the oil and gas cooling plate 701, and the gasoline in the oil absorption filter layers 704 overflows to form reflux gasoline, which flows back to the oil collecting tank 20 through the second elastic connecting head 301, and the PLC controller controls the vibrator 11 to close;

[0103] The excess airflow passes through the second vent hole 717 on the pressing plate 707 and flows out from the air outlet pipe 703. At this time, the diverter pipe 801 on the air outlet pipe 703 can divert the oil and gas in the airflow, so that the oil and gas in the airflow can fully contact with the washing liquid in the oil and gas adsorption box 80, and then the oil and gas in the airflow can be fully removed, the overflow of oil and gas can be reduced, and the pollution to the air environment can be reduced;

[0104] When the gasoline in the oil collecting tank 20 needs to be discharged, the oil and gas recovery detector as a whole is moved to the oil unloading place under the support of the roller 404, and the oil outlet pump 904 and the oil outlet pipe 905 discharge the gasoline; or, hold the handle and pull out the horizontal section 402 horizontally, the horizontal section 402 drives the oil collecting tank 20 to separate from the two vertical connecting sections 401, the first oil inlet 201 on the oil collecting tank 20 is separated from the first elastic connecting head 501 on the connecting main pipe 50, and the second oil inlet 202 on the oil collecting tank 20 is connected to the second elastic connecting head 501 on the oil and gas recovery box 30. The elastic connecting head 301 is separated, the horizontal section 402 and the oil collecting tank 20 are moved to the oil unloading place under the support of the roller 404, the oil outlet pump 904 and the oil outlet pipe 905 discharge the gasoline, and the remaining oil collecting tanks 20 or the oil collecting tanks 20 after oil unloading can be installed between the vertical connecting sections 401 through the horizontal section 402, the first elastic connecting head 501 is deformed and inserted into the first oil inlet 201 on the oil collecting tank 20 again, and the second elastic connecting head 301 is deformed and inserted into the second oil inlet 202 on the oil collecting tank 20 again;

[0105] Repeat the above process and perform oil and gas detection and recovery on the next refueling gun.

[0106] During the oil and gas detection of the gas pumping gun, the annular sealing block of the oil inlet pipe 101 can cooperate with the gas pumping gun, so that a closed state can be formed between the metering barrel 10, the oil inlet pipe 101, the oil and gas return pipe 104 and the gas pumping gun, thereby improving the detection accuracy; at the same time, the third switch valve 604 can also cooperate with the main control valve 601, so that the air pressure detector 102 and the gas flow meter 103 can obtain parameters with high accuracy, which is convenient for understanding the changes in air pressure data and gas flow data; during the oil inlet pipe 101 oil intake process, the oil and gas return pipe 104, whose outline in the top view is in the shape of a "7", is not opposite to the gasoline entry direction in the oil inlet pipe 101, which can prevent gasoline from entering the oil and gas return pipe 104, reduce the influence of gasoline on the air pressure detector 102 and the gas flow meter 103 in the oil and gas return pipe 104, and improve the detection accuracy.

[0107] When judging whether the amount of oil and gas meets the standard, the air pressure data and the gas flow data are used to obtain the gas-liquid ratios θ1 and θ2 when refueling in the refueling gun respectively. The data difference between θ1 and θ2 can be comprehensively compared to determine whether it is large to determine whether the detection process is normal. When the data difference between θ1 and θ2 is not large, the values ​​of θ1 and θ2 can be averaged to obtain the δ value, which is convenient for comparison with the standard value range (1 to 1.2). It can be convenient and accurate to judge whether the amount of oil and gas in the refueling gun meets the standard. The entire detection and judgment process is convenient, simple to operate and efficient.

[0108] When recovering gasoline and oil and gas, an oil collecting tank 20 and an oil and gas recovery box 30 are used for separate recovery. The oil and gas recovery box 30 can cooperate with the oil and gas recovery processing unit, and the oleophobic layer and the vibrator 11 can cooperate to fully recover the oil and gas remaining in the metering barrel 10, the oil inlet pipe 101 and the oil and gas return pipe 104, and can significantly reduce the influence of the amount of gasoline remaining in the metering barrel 10 on the detection accuracy of the next refueling gun; in the process of oil and gas recovery by the oil and gas recovery processing unit, the oil and gas cooling plate 701, the oil absorption filter layer 704 and the suction pump 702 can cool, absorb and filter the oil and gas to achieve full collection of the oil and gas. The oil and gas adsorption box 80 can further process the oil and gas in the airflow, reduce the overflow of oil and gas, and reduce the pollution to the ambient air.

[0109] When the plurality of oil absorption filter layers 704 are compressed, the limiting steel sheets 705 on the oil absorption filter layers 704 continue to tension and fit the oil absorption filter layers 704 to be installed in the oil and gas recovery box 30, and the limiting steel sheets 705 cooperate with the limiting slide rails 706 to ensure that the plurality of oil absorption filter layers 704 maintain stable sliding when compressed; when the plurality of oil absorption filter layers 704 disperse to absorb oil and gas, gaps are formed between the plurality of oil absorption filter layers 704, so that space for airflow is formed between the plurality of oil absorption filter layers 704, which facilitates the oil absorption filter layers 704 to absorb oil and gas.

[0110] During the oil unloading process, when the detection of the next gas gun is not urgent, the overall mobile oil and gas recovery detector can be selected to unload the oil; when the detection of the next gas gun is more urgent, the horizontal section 402 and the oil collecting tank 20 can be disassembled and replaced, so as to transfer the oil collecting tank 20 and the horizontal section 402 filled with gasoline to the oil unloading site for oil unloading, so that the detection of several gas guns is not affected, thereby improving the detection efficiency; in this process, the first elastic connecting head 501 and the second elastic connecting head 301 can accurately cooperate with the oil collecting tank 20, so that the coordination and connection between the oil collecting tank 20 and the connecting main pipe 50 and the oil and gas recovery box 30 is more convenient and simple, and the disassembly and assembly is also simpler.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An oil and gas recovery detector, comprising a metering barrel, characterized in that: Also includes: An oil inlet pipe which can be sealed and detachably connected to the end of the fueling gun, and the oil inlet pipe is connected to the upper end of the metering barrel; Air pressure detector; Gas flow meter; An oil and gas return pipe, one end of which is connected to the upper end of the metering barrel, and the other end of which is connected to the middle of the oil inlet pipe. The air pressure detector and the gas flow meter are installed on the oil and gas return pipe to detect the air pressure and gas flow of the oil and gas in the oil and gas return pipe; An oil collecting tank, which can be connected to a metering barrel; The oil and gas recovery box can be connected to the metering barrel, and the oil and gas recovery box can also be connected to the oil collecting tank. The oil and gas recovery box is provided with an oil and gas recovery processing unit.

2. The oil and gas recovery detector according to claim 1, characterized in that: Also includes: A mounting frame with a "U"-shaped longitudinal section, wherein the metering barrel, the oil and gas recovery box and the oil collecting tank are sequentially mounted between the two ends of the mounting frame; A connecting main pipe, the connecting main pipe is vertically connected between the metering barrel and the oil collecting tank, a main control valve is provided on one end of the connecting main pipe close to the metering barrel, and a first switch valve is provided on one end of the connecting main pipe close to the oil collecting tank; A connecting branch pipe is connected between the oil and gas recovery box and the connecting main pipe. The connecting point between the connecting branch pipe and the connecting main pipe is located between the main control valve and the first switch valve. A second switch valve is provided on the connecting branch pipe.

3. An oil and gas recovery detector as claimed in claim 2, characterized in that: The oil inlet pipe is provided with a third switch valve, and the third switch valve is located at the upper side of the connection point between the oil and gas return pipe and the oil inlet pipe.

4. The oil and gas recovery detector according to claim 3, characterized in that: The mounting frame comprises: Two "L"-shaped vertical connecting sections, the side walls of the two vertical connecting sections are fixedly connected to the side walls of the oil and gas recovery box, and a mounting plate is fixedly arranged horizontally at the upper ends of the two vertical connecting sections, and the metering barrel is fixedly mounted on the mounting plate; A horizontal section located between the lower ends of the two vertical connecting sections, the upper side of the horizontal section is fixedly connected to the oil collecting tank, and the two sides of the horizontal section are spliced ​​and connected to the end surfaces of the lower ends of the two vertical connecting sections; Rollers are arranged on the lower surfaces of the vertical connection section and the horizontal section.

5. The oil and gas recovery detector according to claim 4, characterized in that: The upper side of the oil collecting tank is provided with a first oil inlet connected to the connecting main pipe and a second oil inlet connected to the oil and gas recovery tank; A first truncated cone-shaped elastic connecting head is fixedly provided on the lower end of the connecting main pipe, and the first elastic connecting head can be sealed and fitted with the side wall of the first oil inlet of the oil collecting tank; A second elastic connecting head is fixedly arranged on the lower side of the oil and gas recovery box, the second elastic connecting head is connected to the oil and gas recovery box, and the second elastic connecting head can be sealed and fitted with the side wall of the second oil inlet of the oil collecting tank.

6. The oil and gas recovery detector according to claim 5, characterized in that: The oil and gas recovery processing unit comprises: An oil and gas cooling plate, the oil and gas cooling plate is vertically fixedly installed in the oil and gas recovery box, the oil and gas cooling plate covers the longitudinal section of the oil and gas recovery box and is directly opposite to the end of the connecting branch pipe away from the connecting main pipe, the second elastic connecting head is located between the oil and gas cooling plate and the connecting branch pipe, and the oil and gas cooling plate is horizontally penetrated with a plurality of first vent holes; A suction pump, the suction pump is fixedly connected to an end of the oil and gas recovery tank away from the connecting branch pipe, and an air outlet pipe is provided on the suction pump; A plurality of flexible oil absorption filter layers, wherein the oil absorption filter layers are circumferentially wrapped with a limited steel sheet, and the plurality of oil absorption filter layers are all located in the oil and gas recovery box and between the oil and gas cooling plate and the suction pump; A plurality of limit slide rails, wherein the limit slide rails are fixedly installed horizontally in the oil and gas recovery box, and the axis of the limit slide rails is perpendicular to the surface of the oil and gas cooling plate, and the outer wall of the limit steel sheet is horizontally slidably connected to the limit slide rails; A pressing plate, the pressing plate is vertically arranged in the oil and gas recovery box, the pressing plate is located between the plurality of oil absorption filter layers and the suction pump, and the pressing plate is horizontally penetrated with a plurality of second vent holes; A telescopic rod, one end of which is fixedly connected to a side of the pressing plate away from the plurality of oil absorption filter layers, and the other end of which passes through the oil and gas recovery box and is located outside the oil and gas recovery box; A hydraulic pump for controlling the extension and retraction of the telescopic rod, wherein the hydraulic pump and the suction pump are both fixedly mounted on the outer wall of the oil and gas recovery box.

7. The oil and gas recovery detector according to claim 6, characterized in that: The oil and gas recovery processing unit also includes: A plurality of shunt pipes, one end of each of which is connected to the air outlet pipe; The oil and gas adsorption box is detachably connected to the end of the air outlet pipe. The oil and gas adsorption box contains washing liquid that absorbs oil and gas or reacts with oil and gas. The end of the diversion pipe away from the air outlet pipe is located below the liquid level of the washing liquid.

8. The oil and gas recovery detector according to claim 7, characterized in that: The metering barrel, the oil inlet pipe, the oil and gas return pipe, the oil collecting tank, the oil and gas recovery box, the connecting main pipe and the connecting branch pipe are all coated with an oleophobic layer.

9. The oil and gas recovery detector according to claim 8, characterized in that: Also included is a control unit, the control unit comprising: PLC controller; A liquid level sensor for detecting the amount of gasoline in the metering barrel; The main control valve, the first switch valve, the second switch valve and the third switch valve are all solenoid switch valves; A vibrator is installed on the outer wall of the metering barrel; A first controller for controlling the oil and gas cooling plate to be turned on or off; a second controller for controlling the suction pump to be turned on or off; a third controller for controlling the hydraulic pump to be turned on or off; a fourth controller for controlling the vibrator to be turned on or off; The liquid level sensor, the main control valve, the first switch valve, the second switch valve, the third switch valve, the first controller, the second controller, the third controller, the fourth controller, the air pressure detector and the gas flow meter are all connected to the PLC controller by electrical signals.

10. An oil and gas detection and recovery method, characterized in that: The oil and gas recovery detector according to claim 9 further comprises the following steps: The PLC controller controls the third switch valve to open and the main control valve, the first switch valve and the second switch valve to close; The end of the refueling gun is embedded in the oil inlet pipe, and the end of the refueling gun is sealed by the oil inlet pipe; The air pressure detector measures and obtains the initial air pressure data X1kPa at the oil inlet pipe; the gas flow meter measures and obtains the initial gas flow data A1L / min at the oil inlet pipe; The refueling gun performs refueling operation, and the liquid level sensor detects the amount of gasoline in the metering barrel in real time. When the liquid level measured by the liquid level sensor reaches the standard liquid level Bcm, the refueling operation of the refueling gun is stopped, and the PLC controller controls the third switch valve to close; the air pressure detector measures the air pressure data X2kPa at the oil inlet pipe; the gas flow meter measures the gas flow data A2L / min at the oil inlet pipe; The PLC controller determines whether the oil and gas volume meets the standards: θ1 is the gas-liquid ratio when refueling in the refueling gun; h is the time required for the initial gas flow data A1L / min to change to the gas flow data A2L / min, and S is the cross-sectional area of ​​the inner wall of the metering barrel in cm 2 ; θ2 is the gas-liquid ratio when refueling in the refueling gun; n is the amount of gas, R is the molar gas constant; T is the temperature; When the value of δ is between (1 and 1.2), the oil and gas volume of the fuel gun meets the standard; when δ is not between (1 and 1.2), the oil and gas volume of the fuel gun does not meet the standard; When the air pressure data X2kPa is maintained for more than 1 minute, the PLC controller controls the third switch valve, the main control valve and the first switch valve to open, and the gasoline flows back to the oil collecting tank through the connecting pipe; the PLC controller controls the vibrator to start; When the vibrator is turned on for (5-10) minutes, the PLC controller controls the first switch valve to close, the PLC controller controls the second switch valve, the oil and gas cooling plate and the suction pump to open, the oil and gas recovery box sucks and recovers the oil and gas in the metering barrel, the oil and gas cooling plate cools the oil and gas, and the oil absorption filter layer absorbs and collects the oil and gas; The PLC controller controls the hydraulic pump to start, controls the telescopic rod to extend, and pushes the pressing plate to press a number of oil absorption filter layers against the oil and gas cooling plate, so that the gasoline in the oil absorption filter layer overflows to form reflux gasoline, and the reflux gasoline flows back to the oil collecting tank through the second elastic connecting head; The oil and gas discharged from the air outlet pipe enters the oil and gas adsorption box through a number of branch pipes, and the washing liquid in the oil and gas adsorption box adsorbs or reacts to remove the oil and gas.

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