Oil inlet monitoring device for oil gas recovery system of oiling machine and oil gas recovery system of gas station

Abstract

The oil inlet monitoring device comprises a valve body, an oil-gas separation device and a liquid level detection device, the oil-gas separation device is arranged above an oil collection metering chamber in the middle of the valve body, the liquid level detection device is installed in the oil collection metering chamber, and an oil discharge flow opening is formed in the bottom of the oil collection metering chamber. Oil gas recovered by an oil gas recovery system of the oiling machine enters the valve body through the gas inlet, the recovered oil gas is subjected to gas-liquid separation through an oil-gas separation device arranged above the oil collecting and metering chamber, separated gas is discharged from the gas outlet, separated oil enters the oil collecting and metering chamber, and the oil collecting and metering chamber is communicated with the gas outlet. The liquid level detection device detects the liquid level height of oil in the oil collecting and metering chamber, when the liquid level height exceeds the set height, an alarm signal is sent out, the oil inlet phenomenon of the oil gas recovery system of the oiling machine can be found in time, disputes are avoided, the trust feeling of customers to a gas station is improved, and the service life of the oil collecting and metering chamber is prolonged. And customer complaints are reduced.

Description

Technical Field

[0001] The utility model relates to an oil inlet monitoring device of an oil and gas recovery system of a fuel dispenser and an oil and gas recovery system of a gas station. Background Art

[0002] The gas station is the terminal equipment for selling finished oil, which is used to provide a good human-machine interface and accurate metering and handover. "Oil inflow to the oil and gas recovery system" refers to the phenomenon that when the gas station attendant or customer lifts the oil gun, the submersible pump of the gas station starts, the gas solenoid valve opens, and the main valve switch of the oil gun is not opened, and no oil flows out, the number of liters and the amount of oil refueled appear on the display screen of the gas station, or the oil pipeline activity during the refueling process causes insufficient sealing, causing oil products to enter the oil and gas recovery system, resulting in insufficient refueling. "Oil inflow to the oil and gas recovery system" is a common fault in gas stations. Affected by the working environment, usage mode and frequency, maintenance and other factors, with the increase of years, the overall performance of the gas station gradually ages. After a period of non-use, it is easy to have the oil and gas recovery central axis air pipe rupture, or the O-ring between the gas station gun and the oil and gas recovery pipe rupture, oil and gas are not separated, and oil enters the oil and gas recovery system from the gas line connection.

[0003] At present, the common phenomenon of "oil in the oil and gas recovery system" of gas pumps is mainly discovered through human participation such as customer supervision and daily equipment inspection by gas station staff. However, this human participation method cannot timely discover the problem of "oil in the oil and gas recovery system". The oil in the oil and gas recovery system often causes disputes between gas station customers and gas stations over the amount of gas, causing customers to have great distrust of gas stations, which can easily lead to customer complaints and attract widespread attention from the society and the media, directly affecting the normal operation of gas stations and damaging the brand image of gas stations. Summary of the invention

[0004] The purpose of the utility model is to provide an oil inlet monitoring device for an oil and gas recovery system of a gas station and an oil and gas recovery system for a gas station, so as to solve the technical problem that the oil inlet phenomenon of the prior art oil and gas recovery system often causes disputes over the amount of fuel refueled between gas customers and gas stations, causing customers to have great distrust of gas stations, easily resulting in customer complaints and attracting widespread attention from society and the media, directly affecting the normal operation of gas stations and damaging the brand image of gas stations.

[0005] The technical solution of the utility model is achieved in this way:

[0006] A device for monitoring oil inlet of an oil and gas recovery system of a fuel dispenser, characterized in that it comprises a valve body, an oil and gas separation device and a liquid level detection device, an oil collecting and metering chamber is arranged in the middle of the valve body, an oil and gas separation device is arranged above the oil collecting and metering chamber, an air inlet and an exhaust port are arranged on the valve body, a liquid level detection device is installed in the oil collecting and metering chamber, an oil discharge flow port is arranged at the bottom of the oil collecting and metering chamber, the oil discharge flow port is connected to the exhaust port, the oil and gas recovered by the oil and gas recovery system of the fuel dispenser enters the interior of the valve body through the air inlet, the recovered oil and gas are separated into gas and liquid by the oil and gas separation device arranged above the oil collecting and metering chamber, the separated gas is discharged from the exhaust port, the separated oil enters the oil collecting and metering chamber, and then flows from the oil discharge flow port at the bottom of the oil collecting and metering chamber to the exhaust port, the liquid level detection device detects the liquid level height of the oil inside the oil collecting and metering chamber, and when the liquid level height of the oil exceeds the set height, an alarm signal is sent out.

[0007] The above-mentioned oil-gas separation device is a filter screen.

[0008] The above-mentioned change in the diameter of the oil discharge flow port can change the oil outflow speed of the oil collecting and metering chamber and change the detection level.

[0009] The above-mentioned liquid level detection device is a float type liquid level detection device or an ultrasonic liquid level detection device or a laser liquid level detection device.

[0010] The above-mentioned liquid level detection device includes a float, a float rod and a liquid level sensor. The float is mounted on the float rod and placed in the oil collecting and metering chamber. The liquid level sensor is a switch component and is installed on the float rod. When the oil level in the oil collecting and metering chamber exceeds the set height, the float moves up along the float rod to trigger the liquid level sensor, causing the liquid level sensor to send an alarm signal.

[0011] The above-mentioned valve body includes a main body and a cover, the cover is installed at the top of the main body, the oil collecting and metering chamber is arranged in the middle of the main body, an oil discharge flow port is arranged at the bottom of the oil collecting and metering chamber, an air intake channel is arranged on the right side of the oil collecting and metering chamber, and an exhaust channel is arranged on the left side of the oil collecting and metering chamber. The air intake port is connected to the bottom end of the air intake channel, and the top end of the air intake channel is connected to the oil-gas separation device. The oil-gas separation device uses the exhaust channel to discharge the separated gas, and the exhaust channel is connected to the exhaust port. The top of the float rod is installed on the cover.

[0012] The exhaust port and the air inlet are both provided with threads to facilitate pipeline connection.

[0013] The main body is in a flat block shape, the air inlet is arranged on the right side of the main body, and the air outlet is arranged on the bottom surface of the main body.

[0014] A gas station oil and gas recovery system includes a plurality of gas station dispensers, a plurality of oil tanks, a plurality of oil pumps and a background computer installed at the gas station. Each gas station dispenser is connected to the background computer via a communication line. The oil tank is connected to the gas station dispenser via an oil pump and a refueling pipeline. A plurality of oil and gas recovery type refueling guns are arranged on each gas station dispenser. A gas flow meter is installed at the oil and gas recovery branch pipe at the bottom of each gas station dispenser to monitor the oil and gas recovery data of each gas station dispenser. The background computer collects the oil and gas recovery data transmitted back by the gas flow meter. The background computer also collects the oil and gas recovery data of each oil and gas recovery type refueling gun of each gas station dispenser. The background computer matches and associates the oil and gas recovery data with the refueling data to generate a single-gun gas-liquid ratio for each transaction record of each oil and gas recovery refueling gun; an oil and gas recovery system oil inlet monitoring device is installed on the oil and gas recovery branch pipe of the refueling machine, or an oil and gas recovery system oil inlet monitoring device can be installed on the oil and gas recovery pipeline of each refueling gun; when the refueling gun is refueling, the oil and gas recovery system oil inlet monitoring device detects the oil inlet and sends out an alarm message, which is characterized in that: the oil and gas recovery system oil inlet monitoring device adopts the above-mentioned refueling machine oil and gas recovery system oil inlet monitoring device.

[0015] The advantages of this utility model compared with the prior art:

[0016] 1. The utility model can timely detect the oil inflow situation of the oil and gas recovery system, which is convenient for timely maintenance of the equipment. The utility model is a fuel dispenser oil and gas recovery system oil inflow monitoring device. The oil and gas recovered by the fuel dispenser oil and gas recovery system enter the valve body through the exhaust port. The recovered oil and gas are separated into gas and liquid through the oil and gas separation device arranged above the oil collecting and metering chamber. The separated gas is discharged from the exhaust port, and the separated oil enters the oil collecting and metering chamber, and then flows to the exhaust port from the oil discharge flow port at the bottom of the oil collecting and metering chamber. The liquid level detection device detects the oil level height inside the oil collecting and metering chamber. When the oil level height exceeds the set height, an alarm signal is sent out. The fuel inflow phenomenon of the fuel dispenser oil and gas recovery system can be detected in time, avoiding disputes over the amount of fuel to be refueled between refueling customers and gas stations, improving customers' trust in gas stations, reducing customer complaints, avoiding widespread attention from the society and the media, ensuring the normal operation of gas stations, and enhancing the brand image of gas stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view schematic diagram of a gas station in the prior art;

[0018] Figure 2 The application principle diagram for the implementation of the utility model;

[0019] Figure 3 A three-dimensional diagram of an oil inlet monitoring device for an oil vapor recovery system of a fuel dispenser according to a first embodiment of the utility model;

[0020] Figure 4Another perspective view of the oil inlet monitoring device of the oil vapor recovery system of the fuel dispenser according to the first embodiment of the utility model;

[0021] Figure 5 This is a front view of an oil inlet monitoring device for an oil vapor recovery system of a fuel dispenser according to a first embodiment of the utility model;

[0022] Figure 6 yes Figure 5 AA section view;

[0023] Figure 7 It is an exploded view of an oil inlet monitoring device of an oil vapor recovery system of a fuel dispenser according to a first embodiment of the utility model. DETAILED DESCRIPTION

[0024] Embodiment 1:

[0025] like Figure 1 As shown, existing gas stations generally install 4 to 16 gas pumps, and each gas pump generally has 6 oil and gas recovery type gas pumping guns, which are evenly distributed on both sides of the gas pump. The 3 oil and gas recovery type gas pumping guns on each side correspond to 92# gasoline, 95# gasoline and 98# gasoline respectively.

[0026] Figure 2 A gas station gas recovery system with an online monitoring function is provided, which is equipped with an oil gas recovery system oil inlet monitoring device 100. The alarm information of the oil gas recovery system oil inlet monitoring device 100 is connected to the gas station gas recovery system with an online monitoring function, so that the oil inlet condition of the gas recovery equipment when refueling with a refueling gun can be identified while monitoring the oil gas recovery.

[0027] like Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, this embodiment provides an oil inlet monitoring device for an oil and gas recovery system of a fuel dispenser, characterized in that it includes a valve body 1, an oil and gas separation device 3 and a liquid level detection device 2, an oil collecting and metering chamber 11 is arranged in the middle of the valve body 1, an oil and gas separation device 3 is arranged above the oil collecting and metering chamber 11, an air inlet 12 and an exhaust port 13 are arranged on the valve body 1, the liquid level detection device 2 is installed in the oil collecting and metering chamber 11, an oil discharge flow port 14 is arranged at the bottom of the oil collecting and metering chamber 11, and the oil discharge flow port 14 is connected to the exhaust port 13. The collected oil and gas enter the valve body 1 through the air inlet 12, and the recovered oil and gas are separated into gas and liquid through the oil and gas separation device 3 set above the oil collecting and metering chamber 11. The separated gas is discharged from the exhaust port 13, and the separated oil (i.e., oil droplets) enters the oil collecting and metering chamber 11 under the action of gravity, and then flows from the oil discharge flow port 14 at the bottom of the oil collecting and metering chamber to the exhaust port 13. The liquid level detection device 2 detects the liquid level of the oil inside the oil collecting and metering chamber 11. When the liquid level of the oil exceeds the set height, an alarm signal is sent out. The detection level can be changed by changing the diameter of the oil discharge flow port 14.

[0028] The oil-gas separation device 3 is a filter screen, which has a simple structure, is easy to manufacture and has a low cost.

[0029] The liquid level detection device 2 is a float type liquid level detection device, an ultrasonic liquid level detection device or a laser liquid level detection device.

[0030] The above-mentioned liquid level detection device 2 includes a float 21, a float rod 22 and a liquid level sensor 23. The float 21 is mounted on the float rod 22 and placed in the oil collecting and metering chamber 11. The liquid level sensor 23 is a switch component and is installed on the float rod 22. When the liquid level of the oil in the oil collecting and metering chamber 11 exceeds the set height, the float 21 moves up along the float rod 22 to trigger the liquid level sensor 23, so that the liquid level sensor sends an alarm signal. The structure is simple, the manufacturing is easy, the operation is reliable, and the manufacturing cost is low.

[0031] The above-mentioned valve body 1 includes a main body 1c and a cover 1d, the cover 1d is installed on the top of the main body 1c, the oil collecting and metering chamber 11 is arranged in the middle of the main body 1c, an oil discharge flow port 14 is arranged at the bottom of the oil collecting and metering chamber 11, an air intake channel 15 is arranged on the right side of the oil collecting and metering chamber 11, and an exhaust channel 16 is arranged on the left side of the oil collecting and metering chamber 11. The air intake port 12 is connected to the bottom end of the air intake channel 15, and the top end of the air intake channel 15 is connected to the oil-gas separation device 2. The oil-gas separation device 2 uses the exhaust channel 16 to discharge the separated gas, and the exhaust channel 16 is connected to the exhaust port 13. The top of the float rod 22 is installed on the cover 1d, which has a simple structure and a reasonable layout.

[0032] The exhaust port 13 and the air inlet 12 are both provided with threads to facilitate pipeline connection.

[0033] The main body 1c is in the shape of a flat block, the air inlet 12 is arranged on the right side of the main body 1c, and the air outlet 13 is arranged on the bottom surface of the main body 1c, with a simple structure and a reasonable layout.

[0034] The spatial size of the oil collecting and metering chamber 11 and the size of the oil discharge flow port 14 are related to the monitoring level of the inflow speed of the oil entering the oil metering chamber; if a float method is used to monitor the liquid level (i.e., a float-type liquid level detection device), within a certain period of time, when the oil discharge capacity of the oil discharge flow port 14 is greater than the inflow speed of the oil, the float 21 cannot float up; within a certain period of time, when the oil discharge capacity of the oil discharge flow port 14 is less than the inflow speed of the oil, the float 21 does float up, and when the oil accumulated in the oil collecting and metering chamber 11 exceeds a certain volume, the float 21 is in the highest position at this time. Under the condition that the space of the oil collecting and metering chamber 11 remains unchanged, the level of monitoring the inflow speed of the oil entering the oil and gas recovery system can be set by changing the size of the oil discharge flow port 14.

[0035] Assuming that the flow rate of the oil discharge flow port when the float 21 floats up to the trigger position switch height is 0.1L / minute, if the flow rate of the oil entering the oil and gas recovery system is lower than or equal to 0.1L / minute, the floating height of the float will not reach the height to trigger the liquid level sensor 23; if the flow rate of the oil entering the oil and gas recovery system reaches 0.13L / minute or above, the amount of oil entering the oil collecting and metering chamber 11 is greater than the amount of oil discharged, and after the oil in the oil collecting and metering chamber accumulates for a certain period of time, the float rises and triggers the liquid level sensor 23 to issue an oil inflow alarm for the oil and gas recovery system. If the oil collecting chamber space M is 0.01L when the float 21 triggers the switch, and the influence of the liquid level difference on the flow rate is not considered, the oil inlet flow rate is X: 0.13L / minute, and the oil discharge flow rate of the oil discharge port 14 is Y: 0.1L / minute, the oil inlet time N reaches the trigger alarm, that is, N = M / (XY) = 0.01 / (0.13-0.1) = 0.33 minutes, that is, the alarm state can be reached when the oil is inlet for 20 seconds. The oil filling flow rate of a single oil gun is A: 38 liters / minute, and the alarm oil inlet rate K = X / A = 0.13 / 38 = 0.34%. If 50L of fuel is added each time, the refueling time is about 79 seconds (i.e., the refueling time N), and the minimum refueling alarm flow rate is X=M / N+Y=0.01 / 1.3+0.1=0.108L / minute, that is, the alarm refueling rate K is 0.28%, that is, the abnormal refueling error rate is controlled within the national prescribed transaction error range of no more than 0.3%.

[0036] Embodiment 2:

[0037] like Figure 2As shown, a gas station gas recovery system equipped with a gas recovery system oil inlet monitoring device 100 with an online monitoring function is used. The alarm information of the gas recovery system oil inlet monitoring device 100 is connected to the gas station gas recovery system with an online monitoring function, so as to realize the oil inlet status of the gas recovery equipment when refueling with a refueling gun while monitoring the oil and gas recovery.

[0038] like Figure 2 As shown, a gas station oil and gas recovery system with an online monitoring function includes a plurality of gas station dispensers 1b, a plurality of oil tanks 4b, a plurality of oil pumps (not shown) and a background computer 2b installed in the gas station, each gas station dispenser 1b is connected to the background computer 2b via a communication line, the oil tank 4b is connected to the gas station dispenser 1b via an oil pump and a refueling pipeline, a plurality of oil and gas recovery type refueling guns are arranged on each gas station dispenser 1b, a gas flow meter 5b is installed at the oil and gas recovery branch pipe 31b at the bottom of each gas station dispenser 1b to monitor the oil and gas recovery data of each gas station dispenser 1b, and the background computer 2b collects the oil and gas recovery data transmitted back by the gas flow meter 5b; the background computer 2b also collects the refueling data of each oil and gas recovery type refueling gun of each gas station dispenser 1b, and the background computer 2b matches and associates the oil and gas recovery data with the refueling data to generate a single-gun gas-liquid ratio of each transaction record of each oil and gas recovery type refueling gun. The above-mentioned oil and gas recovery data includes the start time, end time, return gas volume data and number when the gas flow meter is measuring; the refueling data includes the opening time, closing time, refueling quantity and gun number of the refueling gun switch. The various oil and gas recovery branch pipes 31b are finally converged into the oil and gas recovery branch pipe 3b and then reach the oil tank 4b.

[0039] An oil and gas recovery system oil inlet monitoring device 100 is installed on the oil and gas recovery branch pipe 31b of the gas dispenser 1b, or an oil and gas recovery system oil inlet monitoring device 100 may be installed on the oil and gas recovery pipeline of each gas dispenser gun. When the gas dispenser gun is refueling, the oil and gas recovery system oil inlet monitoring device 100 detects the oil inlet and sends out an alarm message, and displays the oil inlet of the gas dispenser oil and gas recovery device on the gas dispenser; or the alarm message is associated with the gas dispenser gun refueling switch information system, and displays the oil inlet of the gas and gas recovery device of a certain gas dispenser gun.

[0040] The backend computer 2b includes a computer responsible for calculating and monitoring the oil-gas-liquid ratio of each transaction record of each oil-gas recovery refueling gun, thereby realizing the online monitoring function of oil-gas recovery. The technical solution of the gas station oil-gas recovery system with online monitoring function is the invention patent with reference to patent number: CN202210354764, which will not be described here.

[0041] The utility model has the following advantages: the oil and gas recovered by the oil and gas recovery system of the fuel dispenser enters the interior of the valve body through the exhaust port, the recovered oil and gas are separated into gas and liquid through the oil and gas separation device arranged above the oil collecting and metering chamber, the separated gas is discharged from the exhaust port, the separated oil enters the oil collecting and metering chamber, and then flows to the exhaust port from the oil discharge flow port at the bottom of the oil collecting and metering chamber, the liquid level detection device detects the liquid level height of the oil in the oil collecting and metering chamber, and when the liquid level height of the oil exceeds the set height, an alarm signal is sent out, the phenomenon of oil inflowing into the oil and gas recovery system of the fuel dispenser can be discovered in time, and disputes over the amount of fuel to be refueled between refueling customers and gas stations can be avoided, the trust of customers in gas stations can be enhanced, customer complaints can be reduced, and widespread attention from the society and the media can be avoided, the normal operation of gas stations can be guaranteed, and the brand image of gas stations can be enhanced.

[0042] The above-mentioned fuel dispenser oil and gas recovery system oil inlet monitoring device is installed on the oil and gas recovery pipe of each fuel gun or fuel dispenser. During the oil and gas recovery process during refueling, oil and gas recovery system equipment failure causes oil to enter the oil and gas recovery system, and the oil and oil gas enter the valve body, and the oil and gas are diverted through the oil and gas separation device. The oil flows into the oil collecting and metering chamber, and the oil and gas are merged into the oil and gas recovery pipeline through the exhaust port. When the inflow speed of the oil entering the oil collecting and metering chamber is lower than the direct discharge speed through the oil discharge flow port, the oil does not accumulate in the oil collecting and metering chamber, the liquid level does not rise, and the liquid level detection device is not triggered. When the inflow speed of the oil is greater than the discharge speed of the oil discharge flow port, the excess oil accumulates in the oil collecting and metering chamber to a certain amount, the liquid level rises, and the liquid level detection device is triggered to send an alarm signal, reminding the gas station background management computer to handle the oil leakage incident.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A fuel inlet monitoring device for a fuel dispenser oil vapor recovery system, characterized in that The invention comprises a valve body (1), an oil-gas separation device (3) and a liquid level detection device (2); an oil collecting and metering chamber (11) is arranged in the middle of the valve body (1); an oil-gas separation device (3) is arranged above the oil collecting and metering chamber (11); an air inlet (12) and an air outlet (13) are arranged on the valve body (1); the liquid level detection device (2) is installed in the oil collecting and metering chamber (11); an oil discharge flow port (14) is arranged at the bottom of the oil collecting and metering chamber (11); the oil discharge flow port (14) is connected to the air outlet (13); the oil and gas recovered by the oil and gas recovery system of the fuel dispenser passes through The air inlet (12) enters the interior of the valve body (1), and the recovered oil and gas are separated into gas and liquid through the oil and gas separation device (3) arranged above the oil collecting and metering chamber (11). The separated gas is discharged from the exhaust port (13), and the separated oil enters the oil collecting and metering chamber (11), and then flows from the oil discharge flow port (14) at the bottom of the oil collecting and metering chamber (11) to the exhaust port (13). The liquid level detection device (2) detects the liquid level height of the oil inside the oil collecting and metering chamber (11), and when the oil liquid level height exceeds the set height, an alarm signal is sent out.

2. The oil inlet monitoring device of the oil vapor recovery system of a fuel dispenser according to claim 1 is characterized in that : The oil-gas separation device (3) is a filter screen.

3. The oil inlet monitoring device of the oil vapor recovery system of a fuel dispenser according to claim 1 is characterized in that Changing the diameter of the oil discharge flow port (14) can change the oil outflow speed of the oil collecting and metering chamber and change the detection level.

4. The fuel inlet monitoring device of the fuel tanker oil vapor recovery system according to claim 1 is characterized in that The liquid level detection device (2) is a float type liquid level detection device, an ultrasonic liquid level detection device or a laser liquid level detection device.

5. A fuel inlet monitoring device for a fuel dispenser oil vapor recovery system according to claim 3 or 4, characterized in that The liquid level detection device (2) comprises a float (21), a float rod (22) and a liquid level sensor (23). The float (21) is mounted on the float rod (22) and placed in the oil collecting and measuring chamber (11). The liquid level sensor (23) is a switch component and is mounted on the float rod (22). When the liquid level of the oil in the oil collecting and measuring chamber (11) exceeds a set height, the float (21) moves upward along the float rod (22) to trigger the liquid level sensor (23), so that the liquid level sensor sends an alarm signal.

6. The oil inlet monitoring device of the oil vapor recovery system of a fuel dispenser according to claim 5 is characterized in that The valve body (1) comprises a main body (1c) and a cover (1d), wherein the cover (1d) is mounted on the top of the main body (1c), an oil collecting and metering chamber (11) is arranged in the middle of the main body (1c), an oil discharge flow port (14) is arranged at the bottom of the oil collecting and metering chamber (11), an air intake channel (15) is arranged on the right side of the oil collecting and metering chamber (11), an exhaust channel (16) is arranged on the left side of the oil collecting and metering chamber (11), an air intake port (12) is connected to the bottom end of the air intake channel (15), the top end of the air intake channel (15) is connected to an oil-gas separation device (3), the oil-gas separation device (3) discharges separated gas by using the exhaust channel (16), the exhaust channel (16) is connected to the exhaust port (13), and the top of the float rod (22) is mounted on the cover (1d).

7. The oil inlet monitoring device of the oil vapor recovery system of a fuel dispenser according to claim 6 is characterized in that The exhaust port (13) and the air inlet (12) are both provided with threads to facilitate pipe connection.

8. The oil inlet monitoring device for the oil vapor recovery system of a fuel dispenser according to claim 7 is characterized in that The main body (1c) is in the shape of a flat block, the air inlet (12) is arranged on the right side of the main body (1c), and the air outlet (13) is arranged on the bottom surface of the main body (1c).

9. A gas station oil and gas recovery system, comprising a plurality of gas station dispensers, a plurality of oil tanks, a plurality of oil pumps and a background computer installed at the gas station, each gas station dispenser is connected to the background computer via a communication line, the oil tank is connected to the gas station dispenser via an oil pump and a refueling pipeline, a plurality of oil and gas recovery type refueling guns are arranged on each gas station dispenser, a gas flow meter is installed at the oil and gas recovery branch pipe at the bottom of each gas station dispenser to monitor the oil and gas recovery data of each gas station dispenser, and the background computer collects the oil and gas recovery data transmitted by the gas flow meter; the background computer also collects the oil and gas recovery data of each gas station dispenser; The backend computer matches and associates the refueling data of each oil and gas recovery type refueling gun of the refueling machine with the refueling data to generate a single-gun gas-liquid ratio of each transaction record of each oil and gas recovery refueling gun. An oil and gas recovery system oil inlet monitoring device (100) is installed on the oil and gas recovery branch pipe of the refueling machine, or an oil and gas recovery system oil inlet monitoring device (100) can be installed on the oil and gas recovery pipeline of each refueling gun. When the refueling gun is refueling, the oil and gas recovery system oil inlet monitoring device (100) detects the oil inlet and sends out an alarm message. The invention is characterized in that: The oil inlet monitoring device (100) of the oil vapor recovery system is an oil inlet monitoring device of the oil vapor recovery system of the fuel dispenser according to any one of claims 1 to 8.

Images