Gas station oil tank leakage detection device

Abstract

The utility model discloses a gas station oil tank leakage detection device, which relates to the technical field of oil tank leakage detection, and comprises an outer tank and an inner tank which are mutually sleeved, an in-tank gap is reserved between the outer tank and the inner tank, the gas station oil tank leakage detection device further comprises a detection unit, and the detection unit comprises a pump machine arranged on the outer tank. The water-gas dual-purpose pump is arranged in the oil tank, one end of the pump machine is connected with a liquid pumping pipe which extends into a gap in the tank, and a water flow switch is arranged on the liquid pumping pipe. The detection unit and the alarm device are arranged, and a circulating gas loop is established in the oil tank through the liquid pumping pipe, the gas pumping pipe, the gas return pipe and the water-gas dual-purpose pump; and through the cooperation of the gas detector and the water flow switch, the leakage detection device can realize leakage detection under the conditions of less leakage of the oil tank and gasoline volatilization, so that the detection sensitivity and accuracy are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil tank leakage detection, and in particular relates to an oil tank leakage detection device for a gas station. Background Art

[0002] Automobile gas stations usually consist of underground oil storage tanks and tax-controlled gas pumps. The underground oil storage tanks are separated from the gas pumps and buried underground for a long time. The gas pumps are located on the ground with an oil pipeline in between. During long-term use, the double-layer composite oil storage tanks are very susceptible to corrosion and oil vapor leakage. Once a leak occurs, the consequences are disastrous. Not only will it cause serious damage to the soil around the gas station, but it will also cause irreparable pollution to groundwater resources. In the event of open flames, static electricity, lightning strikes and other accidents, it will cause serious explosions, threatening the personal safety of staff. Therefore, how to effectively detect leakage of double-layer composite oil storage tanks has become a technical problem that needs to be solved urgently.

[0003] In the prior art, temperature sensors are often used to detect oil leakage, which is judged by the temperature difference caused in the detection area after the oil leaks. This method has poor accuracy and low detection sensitivity. The patent authorization number is CN212291343U, which discloses a double-layer composite oil tank leakage detection device. The leaked oil drops on the detection plate. The detection plate drops under the action of gasoline gravity to trigger the pressure sensor to remind the staff of the oil leakage, thereby achieving the effect of being able to detect the oil leakage in real time. However, the amount of oil leakage in the early stage of the oil tank leakage is small, and gasoline is very easy to evaporate in the gap between the inner and outer tank bodies. A small amount of leaked gasoline cannot press the detection plate down to contact the pressure sensor, which will cause inaccurate and untimely leakage detection, which is easy to cause danger. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model provides a gas station oil tank leakage detection device, which can accurately detect the leakage of the oil tank when the leakage amount is small and the gasoline is volatilized. The leakage detection has high accuracy and has little impact on the oil tank itself.

[0005] The utility model adopts the following scheme to solve the technical problem: a gas station oil tank leakage detection device, comprising an outer tank and an inner tank which are mutually fitted, an inner tank gap being left between the outer tank and the inner tank, and a detection unit, wherein the detection unit comprises a pump installed on the outer tank, the pump adopts a water-gas dual-purpose pump, one end of the water-gas dual-purpose pump is connected with a liquid extraction pipe extending into the inner tank gap, a water flow switch is installed on the liquid extraction pipe, a side of the liquid extraction pipe is connected with an air extraction pipe located in the inner tank gap, and a gas detector is installed on the air extraction pipe, the other end of the water-gas dual-purpose pump is connected with an air return pipe, and the output port of the air return pipe is located in the inner tank gap, and an electromagnetic valve 1 is installed on the air return pipe, the liquid extraction pipe, the air extraction pipe and the air return pipe form a loop in the inner tank gap through the pump, an oil storage tank is provided on the outer tank, the oil storage tank is connected to the air return pipe through an oil inlet pipe, and the oil inlet pipe is connected to the front side of the electromagnetic valve 1 on the air return pipe, and an electromagnetic valve 2 is provided on the oil inlet pipe, and an alarm device is installed on the outer tank.

[0006] Furthermore, the bottom of the oil storage tank is connected to the inner tank through an oil return pipe, and a solenoid valve three is installed on the oil return pipe.

[0007] Furthermore, an inverted cone-shaped inclined platform is provided at the bottom of the gap in the tank, an oil storage tank is opened at the center of the inclined platform, and the liquid inlet of the liquid extraction pipe is placed in the oil storage tank.

[0008] Furthermore, a temperature sensor is installed in the gap inside the tank, and a refrigeration device is connected to the return air pipe through a cold air pipe.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] The utility model sets up a detection unit and an alarm device, establishes a circulating gas loop in the oil tank through a liquid extraction pipe, an air extraction pipe, an air return pipe and a water-gas dual-purpose pump, and through the cooperation of a gas detector and a water flow switch, enables the leakage detection device to realize leakage detection when the leakage of the oil tank is small and the gasoline is volatilized, thereby improving the sensitivity and accuracy of the detection; through the control of the solenoid valve one and the solenoid valve two, the leaked gasoline can be automatically extracted and stored in the oil storage tank, the leaked gasoline can be effectively managed and recovered, the maintenance work is simplified, the maintenance cost is reduced, and the waste of resources is reduced. The detection unit can detect and deal with the leakage of the oil tank in time, reduce the safety accidents that may be caused by the leakage of the oil tank, and improve the safety of the gas station. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0012] Figure 2 It is a front view cross-sectional structural schematic diagram of the utility model.

[0013] In the figure: 1. outer tank; 2. inner tank; 3. detection unit; 31. water-gas dual-purpose pump; 32. liquid extraction pipe; 33. water flow switch; 34. air extraction pipe; 35. gas detector; 36. air return pipe; 37. solenoid valve one; 38. oil storage tank; 39. oil inlet pipe; 310. solenoid valve two; 311. exhaust pipe; 4. alarm device; 5. ramp; 6. oil storage tank; 7. oil return pipe; 8. solenoid valve three; 9. cold air pipe; 10. refrigeration equipment; 11. temperature sensor. DETAILED DESCRIPTION

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0015] See also Figure 1-2 The utility model provides a technical solution for a gas station oil tank leakage detection device: Example

[0016] according to Figure 1 and Figure 2 As shown, the oil tank is composed of an outer tank 1 and an inner tank 2 which are fitted into each other, and an inner gap is left between the outer tank 1 and the inner tank 2. A detection unit 3 is arranged in the inner gap of the tank, and the detection unit 3 includes a pump installed on the outer tank 1. The pump adopts a water-gas dual-purpose pump 31. The water-gas dual-purpose pump 31 can pump water or gas, and the working medium can be gas or liquid. A liquid extraction pipe 32 is connected to one end of the water-gas dual-purpose pump 31, and the input end of the liquid extraction pipe 32 extends into the inner gap of the tank. An inverted cone-shaped inclined platform 5 is provided at the bottom of the inner gap of the tank, and an oil storage tank 6 is provided at the center of the inclined platform 5. The liquid inlet of the liquid extraction pipe 32 is placed in the oil storage tank 6. If there is leakage in the oil tank, the leaked oil will flow into the oil storage tank 6 along the inclined platform 5, so that the liquid extraction pipe 32 can concentrate on sucking away the leaked oil, and a water flow switch 33 is installed on the liquid extraction pipe 32. 33 can detect whether there is liquid passing through the liquid extraction pipe 32. The side of the liquid extraction pipe 32 is laterally connected to an air extraction pipe 34 located in the gap in the tank, and a gas detector 35 is installed on the air extraction pipe 34. The gas detector 35 can detect the gas in the gap in the tank; the other end of the water-gas dual-purpose pump 31 is connected to a return pipe 36, and the output port of the return pipe 36 is located in the gap in the tank, and a solenoid valve 37 is installed on the return pipe 36. The liquid extraction pipe 32, the air extraction pipe 34 and the return pipe 36 form a loop in the gap in the tank through the pump machine. An alarm device 4 electrically connected to the gas detector 35 and the water flow switch 33 is installed on the outer tank 1. When the gas detector 35 detects that the gas in the gap in the tank carries gaseous gasoline or the water flow switch 33 detects that liquid passes through the liquid extraction pipe 32, the alarm device 4 sends an alarm signal.

[0017] The water-gas dual-purpose pump 31 always keeps in operation. When there is no leakage in the oil tank, the suction pipe 34 and the return pipe 36 form a gas loop in the gap inside the tank. The gas in the gap inside the tank forms an internal circulation through the pumping of the water-gas dual-purpose pump 31. The gas detector 35 detects that the gas signal is normal. If there is a leakage in the oil tank, when the leakage amount is small, a small amount of gasoline will evaporate into gas. At this time, the suction pipe 34 draws the gaseous gasoline into the circulation loop, and the gas detector 35 detects and sends an alarm signal through the alarm device 4. The alarm device 4 sends out an alarm signal to warn of oil tank leakage information. When the leakage is large, gasoline flows into the oil storage tank 6, and the liquid extraction pipe 32 extracts the gasoline. When the gasoline flows in the liquid extraction pipe 32, it will trigger the water flow switch 33. The alarm device 4 sends out an alarm signal to warn of oil tank leakage information. Through the cooperation of the return air pipe 36, the air extraction pipe 34 and the liquid extraction pipe 32, combined with the water flow switch 33 and the gas detector 35, the oil tank leakage detection can be realized when the oil tank leakage is small and the gasoline is volatilized, thereby improving the sensitivity and accuracy of the detection.

[0018] An oil storage tank 38 is provided on the outer tank 1, and the oil storage tank 38 is connected to the return air pipe 36 through an oil inlet pipe 39, and the oil inlet pipe 39 is connected to the front side of the solenoid valve 1 37 on the return air pipe 36, and a solenoid valve 2 310 is provided on the oil inlet pipe 39. The solenoid valve 1 37 is normally in an open state, so that the gas in the gap in the tank circulates in the loop. When the alarm device 4 sends out an alarm signal, the solenoid valve 1 37 is closed, the outlet of the return air pipe 36 is blocked, and the solenoid valve 2 310 is opened. The gasoline extracted by the extraction pipe 32 can only enter the oil storage tank 38 through the oil inlet pipe 39, and the leaked gasoline in the oil tank is directly extracted to realize the automatic discharge of the leaked gasoline. An exhaust pipe 311 is connected to the side of the oil storage tank 38, and the leaked gaseous gasoline enters the oil storage tank 38 and is discharged from the exhaust pipe 311.

[0019] When used specifically, the utility model is a gas station oil tank leakage detection device. When detecting whether the oil tank is leaking, the water-gas dual-purpose pump 31 always keeps running. If the oil tank is not leaking, the gas in the gap in the tank circulates inside through the suction pipe 34 and the return pipe 36; if the oil tank leaks, when the leakage is small, the gasoline evaporates into gas, and the suction pipe 34 draws the gaseous gasoline into the circulation loop. After the gas detector 35 detects the gasoline, it sends an alarm signal to the alarm device 4; when the leakage is large, the gasoline flows along the inclined surface. The gasoline flows into the oil storage tank 6 through the platform 5, and the liquid extraction pipe 32 extracts the gasoline. When the gasoline flows in the liquid extraction pipe 32, the water flow switch 33 is triggered, and an alarm signal is sent to the alarm device 4. When the alarm device 4 sends an alarm signal, the solenoid valve 1 37 is closed, and the solenoid valve 2 310 is opened. The liquid gasoline and gaseous gasoline extracted by the liquid extraction pipe 32 and the air extraction pipe 34 enter the oil storage tank 38 through the oil inlet pipe 39. The liquid gasoline remains in the oil storage tank 38, and the gaseous gasoline is discharged from the exhaust pipe 311, thereby realizing the leakage detection of the oil tank and the discharge of the leaked gasoline. Example

[0020] On the basis of the first embodiment, Figure 2 As shown, an oil return pipe 7 is connected to the bottom of the oil storage tank 38, the oil storage tank 38 is connected to the inner tank 2 through the oil return pipe 7, and an electromagnetic valve 38 is installed on the oil return pipe 7.

[0021] When used specifically, the utility model is a gas station oil tank leakage detection device. When the oil tank leakage alarm is lifted, the solenoid valve 3 8 is opened, and the gasoline stored in the oil storage tank 38 can flow back into the inner tank 2 along the oil return pipe 7, thereby realizing the recycling of the leaked gasoline. Example

[0022] On the basis of the first embodiment, Figure 2 As shown, a temperature sensor 11 is installed in the gap in the tank, and a refrigeration device 10 is connected to the return air pipe 36 through a cold air pipe 9. The temperature sensor 11 monitors the temperature of the gap in the tank in real time. When the temperature is too high, the gas flowing in the return air pipe 36 will first be cooled by the refrigeration device 10 and then flow into the gap in the tank. The refrigeration device 10 cools the gas circulating in the gap in the tank to keep the oil tank within a safe temperature range.

[0023] The above description is only a preferred embodiment of the present invention and does not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas station oil tank leakage detection device, comprising an outer tank (1) and an inner tank (2) which are mutually mounted, with an inner tank gap remaining between the outer tank (1) and the inner tank (2), characterized in that: The apparatus further comprises a detection unit (3), wherein the detection unit (3) comprises a pump installed on the outer tank (1), wherein the pump is a water-gas dual-purpose pump (31), wherein one end of the water-gas dual-purpose pump (31) is connected to a liquid extraction pipe (32) extending into the gap in the tank, wherein a water flow switch (33) is installed on the liquid extraction pipe (32), wherein a gas extraction pipe (34) located in the gap in the tank is connected to the side of the liquid extraction pipe (32), wherein a gas detector (35) is installed on the gas extraction pipe (34), and the other end of the water-gas dual-purpose pump (31) is connected to a gas return pipe (36), wherein the gas return pipe (36) is connected to the gas return pipe (36). ) is located in the gap in the tank, and a solenoid valve 1 (37) is installed on the return air pipe (36). The liquid extraction pipe (32), the air extraction pipe (34) and the return air pipe (36) form a loop in the gap in the tank through a pump. An oil storage tank (38) is provided on the outer tank (1). The oil storage tank (38) is connected to the return air pipe (36) through an oil inlet pipe (39). The oil inlet pipe (39) is connected to the front side of the solenoid valve 1 (37) on the return air pipe (36). A solenoid valve 2 (310) is provided on the oil inlet pipe (39). An alarm device (4) is installed on the outer tank (1).

2. A gas station oil tank leakage detection device according to claim 1, characterized in that: The bottom of the oil storage tank (38) is connected to the inner tank (2) via an oil return pipe (7), and a solenoid valve (3) (8) is installed on the oil return pipe (7).

3. The oil tank leakage detection device for a gas station according to claim 1, characterized in that: An inverted cone-shaped inclined platform (5) is provided at the bottom of the gap in the tank, an oil storage tank (6) is provided at the center of the inclined platform (5), and a liquid inlet of the liquid extraction pipe (32) is placed in the oil storage tank (6).

4. The oil tank leakage detection device for a gas station according to claim 1, characterized in that: A temperature sensor (11) is installed in the gap in the tank, and a refrigeration device (10) is connected to the return air pipe (36) via a cold air pipe (9).

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