Gas-liquid ratio detection device for oil gun

Abstract

The utility model discloses an oil gun gas-liquid ratio detection device, which comprises an oil gun, a gas-liquid ratio detection device and a gas-liquid ratio detection device, wherein an adapter is mounted at a spray pipe of the oil gun; the gas-liquid ratio testing system comprises an oil-gas flowmeter, a testing oil barrel and a three-way pipe, the first end of the three-way pipe is communicated with a gas inlet of the oil-gas flowmeter, a gas outlet of the oil-gas flowmeter is communicated with an adapter, the second end of the three-way pipe is communicated with the testing oil barrel, and the second end of the three-way pipe is further communicated with outside air through a gas return valve; the oil gas recovery system comprises a compressor and a gas tank, a gas inlet of the compressor is communicated with the third end of the three-way pipe, and the gas tank is communicated with a gas outlet of the compressor; wherein the test oil drum is provided with an oil filling pipe, and the adapter can be inserted into the oil filling pipe to fill oil into the test oil drum. Through detection of the oil gas recovery gas-liquid ratio, oil gas emission pollution in the gas-liquid ratio detection process can be effectively avoided, and the connection reliability of refueling operation of a gas station is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the oil and gas recovery technical field, and particularly relates to a gas-liquid ratio detection device of a refueling gun. BACKGROUND

[0002] The oil and gas discharged by a gas station contains benzene, toluene, xylene and other substances harmful to human bodies, and can cause air pollution such as photochemical smog and haze, so all gas stations selling gasoline in China should be equipped with secondary oil and gas recovery systems.

[0003] The oil and gas recovery system of a gas station refers to a closed collection mode of auxiliary recovery of oil and gas by means of a vacuum generating device when refueling a vehicle, and the process of recovering the oil and gas generated when refueling the vehicle into a buried oil tank. Through the recovery of the oil and gas recovery system, the discharge of oil and gas pollutants into the atmosphere during the refueling process can be reduced, and the purpose of protecting the environment can be achieved. However, it is found in the use process that, since the secondary oil and gas recovery system involves many components such as a refueling gun, a regulating valve and a vacuum pump, and the qualified range of the gas-liquid ratio is relatively narrow, only 1.0-1.2, the failure rate and maintenance cost are relatively high in the actual operation process, and the average recovery efficiency is only about 70%-95%.

[0004] The gas-liquid ratio is the ratio of the volume of collected oil and gas to the volume of refueling, and is an important control index in the oil and gas recovery system. The existing gas-liquid ratio detection method of the refueling gun is to install a closed adapter at the nozzle of the refueling gun, and connect the adapter with a gas flow meter. The gas flows into the oil and gas collection hole of the refueling gun through the gas flow meter. A tee is arranged at the inlet of the gas flow meter, one side of the tee is connected with the oil and gas replaced in the test oil tank, and if the amount of oil and gas generated in the detection is insufficient or excessive, the oil and gas is supplemented or discharged through the gas balance pipe on the other side. However, during the actual detection, when the unqualified gas-liquid ratio of the refueling gun is relatively small, since the replaced oil and gas cannot be completely recovered through the refueling gun, part of the oil and gas is discharged into the air through the tee, causing the emission of oil and gas during the detection of the gas-liquid ratio, and further causing environmental pollution.

[0005] Therefore, in view of the above technical problems, how to avoid the emission of oil and gas during the detection of the gas-liquid ratio is a technical problem to be solved by those skilled in the art. CONTENT OF THE UTILITY MODEL

[0006] The purpose of the present application is to provide a gas-liquid ratio detection device of a refueling gun, which can effectively avoid the emission of oil and gas during the detection of the gas-liquid ratio through the detection of the gas-liquid ratio of oil and gas recovery, and guarantee the connection reliability of the refueling operation of a gas station.

[0007] To achieve the above purpose, the present application provides a gas-liquid ratio detection device of a refueling gun, which comprises:

[0008] A refueling gun, an adapter is installed at the nozzle of the refueling gun.

[0009] The gas-liquid ratio test system comprises an oil-gas flow meter, a test oil barrel, and a tee pipe, a first end of the tee pipe is in communication with an air inlet of the oil-gas flow meter, an air outlet of the oil-gas flow meter is in communication with the adapter, a second end of the tee pipe is in communication with the test oil barrel, and the second end of the tee pipe is also in communication with external air through a back air valve.

[0010] The oil-gas recovery system comprises a compressor and a gas tank, an air inlet of the compressor is in communication with a third end of the tee pipe, and the gas tank is in communication with an air outlet of the compressor.

[0011] Preferably, the test oil barrel is provided with a refueling pipe, and the adapter can be inserted into the refueling pipe to add oil to the test oil barrel.

[0012] Preferably, the oil-gas recovery system further comprises a controller and a pressure sensor, the controller controls the pressure parameter of the compressor according to the actual back air amount of the refueling gun, and the pressure sensor is arranged on the gas tank to monitor the real-time pressure in the gas tank.

[0013] Preferably, the gas-liquid ratio test system further comprises a display module, the display module is in signal connection with the pressure sensor, the oil-gas flow meter, and the refueling gun to collect, display, and store various parameters in the refueling process, the various parameters including the refueling amount, the oil-gas flow, the oil-gas volume, the detection time, the refueling gun number, the gas-liquid ratio, and the oil-gas pressure of the gas tank.

[0014] Preferably, according to the gas-liquid ratio of the refueling gun, the compressor is controlled to be turned on or turned off, when the gas-liquid ratio of the refueling gun is in a preset qualified range or greater than the preset qualified range, the compressor is turned off, and when the gas-liquid ratio of the refueling gun is less than the preset qualified range, the compressor is turned on.

[0015] Preferably, when the gas-liquid ratio of the refueling gun is greater than the preset qualified range, the back air valve can be opened, and air enters the tee pipe through the back air valve.

[0016] Preferably, when the gas-liquid ratio of the refueling gun is in the preset qualified range or less than the preset qualified range, the back air valve is closed.

[0017] Preferably, the test oil barrel is further provided with a unloading pipe, the unloading pipe is provided with a pouring valve, and the other end of the unloading pipe is connected to a buried oil tank.

[0018] Preferably, the oil-gas flow meter is a Roots flow meter, and the precision grade is above level two.

[0019] Preferably, when the oil gas pressure in the gas tank is greater than a preset value, the gas tank is disconnected from the compressor and connected to the buried oil tank to realize the recovery of the oil gas in the gas tank.

[0020] With respect to the above background, in the gas-liquid ratio test process, the oil gun adds an appropriate amount of gasoline to the test oil barrel to have an initial condition of containing oil, fills the oil gun according to a preset refueling time, and determines the gas-liquid ratio according to the ratio of the oil gas volume measured by the oil gas flowmeter and the refueling volume measured by the refueling machine. If the gas-liquid ratio is in a preset qualified range or slightly greater than the preset qualified range, the compressor is stationary, and the oil gas replaced by refueling is all passed through the three-way pipe, the oil gas flowmeter, and then the adapter, and is sucked back into the buried oil tank by the oil gun. When the gas-liquid ratio is large and the gas is insufficient, the gas valve is opened, and the air is sucked back into the tank by the oil gun through the three-way pipe, the oil gas flowmeter, and the adapter. When the gas-liquid ratio is less than the preset qualified range, the replaced oil gas cannot be completely collected and recovered by the oil gas collection of the oil gun nozzle, the compressor is started, and the oil gas is compressed into the gas tank to complete the absorption of the oil gas and avoid the oil gas being discharged into the outside air through the three-way pipe. The application can efficiently and environmentally complete the gas-liquid ratio test of the oil gun of the gas station. Through the detection of the oil gas recovery gas-liquid ratio, the oil gas emission pollution in the gas-liquid ratio test process can be effectively avoided, the connection reliability of the oil filling operation of the gas station is ensured, the safe use of oil products is facilitated, and the relevant environmental protection policy requirements are met. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 The principle diagram of the oil gun gas-liquid ratio detection device provided by the embodiments of the application.

[0023] In the figure: 1-refueling machine; 2-oil gun; 3-test oil barrel; 4-refueling pipe; 5-adapter; 6-dumping valve; 7-oil discharge pipe; 8-oil gas flowmeter; 9-three-way pipe; 10-gas valve; 11-display module; 12-compressor; 13-gas tank; 14-pressure sensor. DETAILED DESCRIPTION

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] It should be noted that in this embodiment, the orientation or positional relationship indicated by terms such as "upper," "lower," "front," and "rear" is based on the orientation or positional relationship shown in the accompanying drawings. It is used only for the convenience of describing this application and for simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1 As shown in the figure, in this embodiment, a gas-liquid ratio detection device for a refueling nozzle is provided, including a refueling nozzle 2, a gas-liquid ratio testing system, and an oil-gas recovery system. An adapter 5 is installed at the nozzle of the refueling nozzle 2. The gas-liquid ratio testing system includes an oil-gas flow meter 8, a test oil tank 3, a three-way pipe 9, etc. The first end of the three-way pipe 9 is connected to the air inlet of the oil-gas flow meter 8, and the air outlet of the oil-gas flow meter 8 is connected to the adapter 5. The displacement oil-gas generated during the refueling process passes through the oil-gas flow meter 8, enters the oil-gas collection hole on the nozzle of the refueling nozzle 2, and is recovered to the buried oil tank (not shown in the figure). The gas-liquid ratio is determined by the ratio of the oil-gas volume measured by the oil-gas flow meter 8 and the refueling volume measured by the refueling machine 1.

[0028] The test oil tank 3 is equipped with a refueling pipe 4, and an adapter 5 can be inserted into the refueling pipe 4 to refuel the test oil tank 3. The second end of the three-way pipe 9 is connected to the test oil tank 3. The displacement oil vapor generated during the refueling process of the refueling nozzle 2 reaches the three-way pipe 9 through the test oil tank 3. After passing through the three-way pipe 9 and the oil vapor flow meter 8, the oil vapor passes through the adapter 5 and is then drawn back into the buried oil tank by the refueling nozzle 2. The second end of the three-way pipe 9 is also connected to the outside air through a return air valve 10. When the gas-liquid ratio is extremely high, the return air valve 10 opens to draw back air to ensure that the oil vapor returns to the buried oil tank. The air drawn back by the return air valve 10 is used to ensure the smooth progress of the refueling test when the gas-liquid ratio is extremely high.

[0029] The oil gas recovery system comprises a compressor 12, a gas tank 13, a controller and a pressure sensor 14, the air inlet of the compressor 12 is communicated with the third end of the three-way pipe 9, the gas tank 13 is communicated with the air outlet of the compressor 12, the controller controls the pressure parameter of the compressor 12 according to the actual gas recovery amount of the refueling gun 2, when the gas-liquid ratio is less than the preset qualified range, the replacement oil gas cannot be completely collected and recovered by the oil gas collection of the nozzle of the refueling gun 2, therefore, the compressor 12 is used to compress the incomplete recovery replacement oil gas to the gas tank 13 at a certain pressure, instead of being discharged into the atmosphere through the three-way pipe 9. The pressure sensor 14 is arranged on the gas tank 13 to monitor the real-time pressure in the gas tank 13, when the pressure in the gas tank 13 is greater than a certain value (such as greater than 1500 pa), the gas tank 13 can be removed, the gas tank 13 is connected with the buried oil tank to complete the oil gas recovery, and the waste and air pollution are avoided.

[0030] In the above-mentioned embodiments, the refueling gun 2 adds appropriate gasoline into the test oil tank 3 to have the initial condition of containing oil, refuels to the jump gun according to the preset refueling time, and determines the gas-liquid ratio according to the ratio of the oil gas volume measured by the oil gas flowmeter 8 and the refueling volume measured by the refueling machine 1. If the gas-liquid ratio is in the preset qualified range or slightly greater than the preset qualified range, the compressor 12 is static, the oil gas replaced by refueling is completely collected and recovered through the three-way pipe 9, the oil gas flowmeter 8 and the adapter 5, and is sucked back into the buried oil tank by the refueling gun 2. When the gas-liquid ratio is greater, the air recovery is insufficient, the air recovery valve 10 is opened, the air is sucked back into the tank by the refueling gun 2 through the three-way pipe 9, the oil gas flowmeter 8 and the adapter 5. When the gas-liquid ratio is less than the preset qualified range, the replacement oil gas cannot be completely collected and recovered by the oil gas collection of the nozzle of the refueling gun 2, the compressor 12 is started, and the oil gas is compressed into the gas tank 13 to complete the absorption of the oil gas, and the oil gas is prevented from being discharged into the outside air through the three-way pipe 9. The gas-liquid ratio test of the refueling gun 2 of the gas station can be efficiently and environmentally completed, the oil gas emission pollution in the gas-liquid ratio test process can be effectively avoided, the gas-liquid ratio test function of the refueling gun 2 with zero oil gas emission is realized, the connection reliability of the refueling operation of the gas station is ensured, the safe use of oil products is ensured, and the requirements of the relevant environmental protection policies are met.

[0031] The gas-liquid ratio test system further comprises a display module 11, the display module 11 is signal connected with the pressure sensor 14, the oil gas flowmeter 8 and the refueling gun 2 to collect, display and store various parameters in the refueling process, the various parameters include the refueling amount, the oil gas flow, the oil gas volume, the detection time, the oil gun number, the gas-liquid ratio, the oil gas pressure of the gas tank 13 and the like. The liquid flowmeter and the oil pump during refueling can be the flowmeter and the oil pump of the refueling machine 1, and a flow regulating valve needs to be matched to adjust the refueling flow rate. The gas flowmeter is recommended to be a Roots flowmeter with a precision grade of more than two levels.

[0032] The cooperation of the oil vapor recovery system and the gas-liquid ratio test system is that the compressor 12 is controlled to be opened or closed according to the gas-liquid ratio of the oil gun 2. Specifically, during the gas-liquid ratio test, when the gas-liquid ratio of the oil gun 2 is in the qualified range of 1.0-1.2 and the unqualified range of greater than 1.2, the compressor 12 remains closed, and the oil vapor replaced during the oiling process passes through the tee pipe 9, the oil vapor flowmeter 8, the adapter 5 in turn, and returns to the buried oil tank through the oil vapor collection hole of the oil gun 2 nozzle. If the gas-liquid ratio is extremely large, the air return valve 10 is opened, air enters the tee pipe 9 from the air return valve 10, and the air is sucked back to ensure that the oil vapor returns to the buried oil tank. The air sucked by the air return valve 10 is used to ensure the smooth progress of the oiling test in the case of extremely large gas-liquid ratio.

[0033] When the gas-liquid ratio is less than 1 in the unqualified range, the replaced oil vapor cannot be completely recovered by the oil vapor collection hole of the oil gun 2 nozzle, the compressor 12 is started, and the oil vapor is compressed into the gas tank 13, that is, part of the oil vapor returns to the adapter 5 through the tee pipe 9 and the oil vapor flowmeter 8, and is sucked back to the buried oil tank by the oil gun 2. Another part of the oil vapor is compressed into the gas tank 13 through the tee pipe 9 and the compressor 12 to prevent the oil vapor from being discharged into the air to cause pollution. With the increase of the test number, the oil vapor pressure in the gas tank 13 gradually increases, and when the pressure in the gas tank 13 is greater than a certain value, the gas tank 13 can be connected to the buried oil tank to realize the recovery of the oil vapor in the tank.

[0034] Of course, the air return valve 10 is only opened in the case of large gas-liquid ratio and the need to suck back air to ensure that the oil vapor returns to the tank. When the gas-liquid ratio is in the pre-set qualified range (1-1.2) or less than the pre-set qualified range, the air return valve 10 is in a closed state.

[0035] In addition, before all tests, the airtightness and reliability of each component device of the entire device need to be checked, the O-shaped sealing ring on the adapter 5 needs to be well and completely lubricated, the sealing property of the connection between the adapter 5 and the oil gun 2 and the oiling pipe 4 needs to be ensured, and the airtightness detection of the adapter 5 needs to be carried out in the explosion-proof area. The battery capacity, operating condition, etc. of the detection device need to be confirmed in advance, and the device needs to be well grounded. Before the test, the air return valve 10 is closed, the tee pipe 9 is opened, the outlet of the oil vapor flowmeter 8 is connected to the adapter 5 with a connecting pipe, the first end of the tee pipe 9 is connected to the inlet of the oil vapor flowmeter 8 with a connecting pipe, the second end of the tee pipe 9 is connected to the test oil barrel 3 with a connecting pipe, the compressor 12 is connected to the third end of the tee pipe 9 and the gas tank 13 respectively, the adapter 5 is inserted into the oiling pipe 4 of the test oil barrel 3, the oil gun 2 is inserted into the adapter 5, and each component is grounded. After assembling each device, 15-20 L of gasoline is added to the test oil barrel 3 to make it have the initial condition of containing oil.

[0036] The test starts, sets the refueling time and the gasoline amount of 15-20L, clears the value on the refueling machine 1, opens the refueling gun 2 to start refueling with high flow rate first and low flow rate later, the refueling machine 1 pump starts, the oil gas recovery system starts simultaneously, the oil gas recovery vacuum pump starts, the oil product is pumped from the buried oil tank to the inside of the refueling gun 2 through the refueling machine 1 and the oil pipe, and then enters the test oil drum 3 through the refueling gun 2, the adapter 5 and the refueling pipe 4.

[0037] The refueling gun 2 refuels according to the preset refueling time until the gun jumps, if the gas-liquid ratio is in the range of 1-1.2, the compressor 12 is static, and all the oil gas replaced by refueling is sucked back to the buried oil tank through the three-way pipe 9, the oil gas flow meter 8, the adapter 5 and the refueling gun 2; when the gas-liquid ratio is large and the back gas is insufficient, the back gas valve 10 is opened, and the air is sucked back to the tank through the three-way pipe 9, the oil gas flow meter 8, the adapter 5 and the refueling gun 2. The measurement parameters of the data acquisition display module 11 are read regularly, after the test is completed, the power is turned off, the test oil drum 3 is connected with the buried oil tank through the oil unloading pipe 7, the dump valve 6 is opened, and the oil product flows into the tank. The test oil drum 3 needs to be grounded all the time before the oil is poured out.

[0038] If the gas-liquid ratio is less than 1, the back gas valve 10 is closed, the real-time oil gas emission amount is calculated according to the measurement parameters of the display module 11, the compressor 12 is started according to the corresponding parameters, part of the replaced oil gas is returned to the adapter 5 through the three-way pipe 9 and the oil gas flow meter 8, and is sucked back to the tank by the refueling gun 2, and the other part of the oil gas is compressed to the gas tank 13 through the three-way pipe 9 and the compressor 12, and the pressure sensor 14 connected with the gas tank 13 can display the oil gas pressure in the tank to the display module 11 in real time. The pressure in the gas tank 13 increases continuously with the increase of the test times, when the pressure in the tank is greater than a certain value displayed in the display module 11, the gas tank 13 is removed, the gas tank 13 is connected with the buried oil tank, and the oil gas recovery is completed. After the test is completed, the power is turned off, the test oil drum 3 is connected with the buried oil tank through the oil unloading pipe 7, the dump valve 6 is opened, and the oil product flows into the tank. The test oil drum 3 needs to be grounded all the time before the oil is poured out.

[0039] The test oil drum 3 can be an activated carbon tank, which can be treated by gasoline analysis after being removed. The above operation can be repeated to complete the oil gas zero emission test of the gas-liquid ratio of the refueling gun 2.

[0040] According to statistics, there are about 120,000 gas stations in China at present, and the average number of refueling guns in each gas station is 8, so there are about 960,000 refueling guns in China at present, and the market cost is about 3.6 billion yuan. According to the frequency of testing the gas-liquid ratio of the refueling gun once every quarter, a total of about 3.84 million gas-liquid ratio tests are needed every year, and the total amount of excessive emission of oil gas during the detection process cannot be ignored, which not only causes energy waste but also pollutes the environment.

[0041] The application can efficiently and environmentally complete the gas-liquid ratio test of the oil gun 2 of the gas station, through the detection of the gas-liquid ratio of the oil gas recovery, the oil gas emission pollution in the gas-liquid ratio detection process can be effectively avoided, the connection reliability of the oil filling operation of the gas station is guaranteed, the safe use of the oil product is beneficial to guarantee, and the long-term economic benefits and social benefits are obtained for promoting the social development and activating the market economy.

[0042] It should be noted that the relational terms herein, such as first and second, are used only to distinguish one entity from another, and do not necessarily require or imply any actual relationship or order between or among the entities.

[0043] The principles and implementation modes of the application are described by applying specific examples herein, and the above example description is only used to help understand the method and core idea of the application. It should be pointed out that, for ordinary skilled in the art, without departing from the principles of the application, the application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the application.

Claims

1. A device for detecting the gas-liquid ratio of a fuel dispensing gun, characterized in that, The application relates to a fueling gun (2) provided with an adapter (5) at a nozzle thereof, a gas-liquid ratio testing system, a vapor recovery system, and a display module (11). The gas-liquid ratio testing system comprises an oil-gas flowmeter (8), a testing oil tank (3), and a tee (9), wherein a first end of the tee (9) is communicated with an air inlet of the oil-gas flowmeter (8), an air outlet of the oil-gas flowmeter (8) is communicated with the adapter (5), a second end of the tee (9) is communicated with the testing oil tank (3), and the second end of the tee (9) is further communicated with external air through a back air valve (10). The vapor recovery system comprises a compressor (12) and a gas tank (13), wherein an air inlet of the compressor (12) is communicated with a third end of the tee (9), and the gas tank (13) is communicated with an air outlet of the compressor (12). The testing oil tank (3) is provided with a fueling pipe (4), and the adapter (5) can be inserted into the fueling pipe (4) to fuel the testing oil tank (3). The vapor recovery system further comprises a controller and a pressure sensor (14), the controller controls the pressure parameter of the compressor (12) according to the actual back air amount of the fueling gun (2), and the pressure sensor (14) is arranged on the gas tank (13) to monitor the real-time pressure in the gas tank (13).

2. The device according to claim 1, characterized in that, The gas-liquid ratio testing system further comprises the display module (11) which is signal-connected with the pressure sensor (14), the oil-gas flowmeter (8) and the fueling gun (2) to collect, display and store various parameters in the fueling process, wherein the various parameters include fueling amount, oil-gas flow, oil-gas volume, detection time, fueling gun number, gas-liquid ratio and oil-gas pressure of the gas tank (13).

3. The device according to claim 2, characterized in that According to the gas-liquid ratio of the fueling gun (2), the compressor (12) is controlled to be opened or closed, wherein when the gas-liquid ratio of the fueling gun (2) is in a preset qualified range or greater than the preset qualified range, the compressor (12) is closed, and when the gas-liquid ratio of the fueling gun (2) is less than the preset qualified range, the compressor (12) is opened.

4. The device according to claim 1, wherein When the gas-liquid ratio of the fueling gun (2) is greater than the preset qualified range, the back air valve (10) can be opened, and air enters the tee (9) through the back air valve (10).

5. The device according to claim 4, characterized in that, When the gas-liquid ratio of the fueling gun (2) is in the preset qualified range or less than the preset qualified range, the back air valve (10) is closed.

6. The device according to claim 4, wherein The testing oil tank (3) is further provided with a fuel unloading pipe (7), the fuel unloading pipe (7) is provided with a tilting valve (6), and the other end of the fuel unloading pipe is connected with a buried oil tank.

7. The device according to claim 1, wherein The oil-gas flowmeter (8) is a Roots flowmeter with a precision grade of more than two levels.

8. The device according to claim 1, wherein When the oil-gas pressure in the gas tank (13) is greater than a preset value, the gas tank (13) is disconnected from the compressor (12) and connected with a buried oil tank to realize the recovery of oil-gas in the gas tank (13).

9. The device according to claim 1, wherein ​

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