Drainage device and fuel system

Abstract

The invention discloses a drainage device and a fuel oil system. The drainage device comprises a water collecting cup, a buoy structure and an adsorption structure. The water collecting cup is provided with a water inlet and a water outlet; the buoy structure comprises a buoy and a blocking part, the buoy is arranged in the water collecting cup and can float along with the liquid level in the water collecting cup, and the blocking part is arranged on the buoy, blocks the water outlet when the buoy sinks to the bottom of the water collecting cup and opens the water outlet when the buoy floats upwards; the adsorption structure is installed on the water collecting cup and can adsorb the buoy when the buoy floats upwards and apply upward adsorption force to the buoy, and the adsorption force is smaller than the sum of the gravity of the buoy and the gravity of the blocking part. According to the scheme, the water drainage starting time and the water drainage ending time are controlled through buoyancy, gravity and adsorption force, the structure is simple and reliable, and cost is low; meanwhile, the mode of increasing the adsorption force at the beginning of drainage can avoid drainage termination caused by descending of the buoy, and stable drainage is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of drainage of a fuel system of a vehicle, and in particular to a drainage device and a fuel system. Background Art

[0002] It is inevitable that there is a small amount of water in diesel. In addition, the fuel tank vent valve of commercial vehicles is required to be long-passed, and water vapor in the air will also blend into the diesel, resulting in excessive water in the diesel. With the requirements of emission upgrades, the requirements for the water content in the oil are getting higher and higher. The current mainstream drainage device is the fuel water separator drainage structure, which integrates a detachable threaded structure at the bottom of the assembly. When the driver observes or senses that the water in the fuel needs to be drained, the bottom drain bolt is loosened to drain the water in the water cup. When a small amount of fuel is observed to flow out, the drainage is stopped and the bolt is tightened. In addition, there is also an automatic drainage device controlled by electricity, which requires a water level sensor, controller, solenoid valve and control circuit.

[0003] For example, publication number CN206830350U discloses a diesel oil-water separation device, in which an oil-water separator is arranged in a fuel oil circuit system, and a water storage chamber is arranged at the lower part of the oil-water separator, and a detection device is arranged in the water storage chamber. The bottom of the water storage chamber is connected to a drain valve and a drain pump, and when the detection device detects excessive water, the detection signal is transmitted to the detection control module, and the detection control module controls the operation of the drain valve and the drain pump to realize automatic discharge of water.

[0004] However, in the prior art, automatic drainage requires the installation of a water level sensor, a controller, a solenoid valve, a control circuit, etc., which has a complex structure and a relatively high cost. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose a drainage device to solve the technical problems in the prior art that automatic drainage requires the installation of water level sensors, controllers, solenoid valves and control circuits, etc., which have complex structures and relatively high costs.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a drainage device, comprising: A water collection cup having a water inlet and a water outlet; A float structure, comprising a float and a blocking portion, wherein the float is disposed in the water collecting cup and can float following the liquid level in the water collecting cup, the blocking portion is disposed on the float and blocks the drain port when the float sinks to the bottom of the water collecting cup, and opens the drain port when the float floats up; and The adsorption structure is installed on the water collecting cup and can adsorb the float when the float floats up, and exert an upward adsorption force on the float, wherein the adsorption force is less than the sum of the gravity of the float and the blocking part.

[0007] In some embodiments, the drain port is located at the bottom of the water collecting cup, and the sealing portion includes a sealing ring, which is disposed at the bottom of the float and is arranged around the periphery of the drain port when the float sinks to the bottom of the water collecting cup.

[0008] In some embodiments, the blocking portion further includes a guide shaft, one end of which is connected to the bottom of the float and is located in the middle of the sealing ring, and the other end of which extends into the drain port.

[0009] In some embodiments, the sealing portion also includes a plurality of support arms, which are connected to the guide shaft and are spaced apart circumferentially and axially along the guide shaft, and the ends of the support arms located in the drain outlet are pressed against the side walls of the drain outlet.

[0010] In some embodiments, the float structure further includes a matching magnet, which is disposed at the upper end of the float, and the adsorption structure includes an adsorption magnet, which is disposed in the water collecting cup and located above the float, and can magnetically attract the matching magnet when the float floats, so as to apply the adsorption force to the float; The adsorption force is smaller than the sum of the gravity of the float, the blocking portion and the matching magnet.

[0011] In some embodiments, the water collection cup further has an air inlet, and the air inlet is located above the water level when the buoy floats up; The buoy structure further includes a connecting arm and a shielding plate, one end of the connecting arm is connected to the buoy, the shielding plate is connected to the connecting arm and is attached to the side wall of the water collecting cup provided with the air inlet, and is provided with a connecting port, the connecting port is staggered from the air inlet when the buoy sinks to the bottom of the water collecting cup, and is connected to the air inlet when the buoy floats up; Wherein, the adsorption force is smaller than the sum of the gravity of the float, the blocking portion, the connecting arm and the shielding plate.

[0012] In some embodiments, the drainage device also includes a partition, which is installed outside the side wall of the water collecting cup, and surrounds a cavity with the part of the water collecting cup where the air inlet is provided, and is provided with a guide port connected to the cavity, and the guide port is located between the water level when the float floats and the air inlet.

[0013] In some embodiments, the air inlet is provided in plurality, and the plurality of air inlets are evenly spaced along the circumference of the water collecting cup; The connecting arms and the shielding plates are provided in multiple groups, respectively. The multiple groups of connecting arms are evenly spaced along the circumference of the buoy. The multiple shielding plates are respectively installed on the multiple connecting arms and correspond to the multiple air inlets.

[0014] In some embodiments, the water inlet is located at the top of the water collection cup.

[0015] In a second aspect, the present solution also provides a fuel system, which includes a drainage device as described in any one of the above items.

[0016] Compared with the prior art, in the drainage device provided by the present invention, the water separated by the oil-water separator is collected by a water collecting cup. When there is no water or very little water in the water collecting cup, the gravity of the float is greater than the buoyancy of the accumulated water on the float. At this time, the float sinks to the bottom of the water collecting cup, so that the sealing part blocks the drainage outlet of the water collecting cup.

[0017] When the water level in the water collection cup rises and reaches the preset water level, the drainage volume of the float increases. At this time, the buoyancy of the float is greater than its gravity, causing the float to rise and the blocking part to open the drainage port. The adsorption structure adsorbs the float and applies an upward adsorption force to the float. In this way, when the water collection cup is draining, the float will not sink and block the drainage port just because the buoyancy has just decreased to less than the gravity. Instead, with the help of the adsorption force, when the accumulated water in the water collection cup drops to a certain water level, the sum of the buoyancy and adsorption force on the float is less than the gravity. The float will sink to the bottom of the water collection tank and block the drainage port again.

[0018] Therefore, this scheme, with the help of the cooperation of the float, the sealing part and the adsorption structure, adopts the form of buoyancy, gravity and adsorption force to control the start and end time of drainage. The structure is simple, reliable and low in cost. At the same time, the method of increasing the adsorption force at the beginning of drainage can avoid the buoyancy and the termination of drainage due to the decline of the float, thereby ensuring stable drainage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a drainage device provided by an embodiment of the present invention when the drainage port is opened; Figure 2 yes Figure 1 Schematic diagram of the middle drainage device blocking the drainage outlet; Figure 3 yes Figure 1 A partial schematic diagram of the middle sealing part and the water collecting cup; Figure 4 yes Figure 1 Partial schematic diagram of the middle connecting arm, baffle plate and water collecting cup.

[0020] Description of reference numerals: 1. Water collecting cup; 1a. Water inlet; 1b. Drain outlet; 1c. Air inlet; 2. Float; 3. Sealing part; 31. Sealing ring; 32. Guide shaft; 4. Adsorption structure; 41. Adsorption magnet; 5. Matching magnet; 6. Connecting arm; 7. Shielding plate; 7a. Connecting port; 8. Partition; 8a. Cavity; 8b. Diversion port; 9. Preset water level. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] In order to solve the technical problem that the automatic drainage in the prior art needs to be equipped with a water level sensor, a controller, a solenoid valve and a control circuit, etc., which has a complex structure and a relatively high cost, the present invention provides a drainage device that can control the start and end time of drainage in the form of buoyancy, gravity and adsorption force, and has a simple, reliable structure and low cost. At the same time, the adsorption force is increased at the beginning of drainage to avoid the cessation of drainage due to the drop of the float, thereby ensuring stable drainage.

[0023] It should be noted that the drainage device described in the present invention is used for but not limited to fuel systems, etc. For the convenience of explanation, in the present invention, only the application of the drainage device to the fuel system is taken as an example for explanation, and the principle of applying the drainage device to other types of equipment is essentially the same as that applied to the fuel system, and will not be described in detail here.

[0024] See also Figures 1 to 3 , Figures 1 to 3 The structural schematic diagram of a drainage device in an embodiment of the present invention comprises a water collecting cup 1, a buoy structure and an adsorption structure 4; the water collecting cup 1 has a water inlet 1a and a water outlet 1b; the buoy structure comprises a buoy 2 and a blocking portion 3, the buoy 2 is arranged in the water collecting cup 1, and can float with the liquid level in the water collecting cup 1, the blocking portion 3 is arranged on the buoy 2, and blocks the water outlet 1b when the buoy 2 sinks to the bottom of the water collecting cup 1, and opens the water outlet 1b when the buoy 2 floats up; the adsorption structure 4 is installed on the water collecting cup 1, and can adsorb the buoy 2 when the buoy 2 floats up, and exerts an upward adsorption force on the buoy 2, and the adsorption force is less than the sum of the gravity of the buoy 2 and the blocking portion 3. Specifically, the buoy 2 sinks to the bottom of the water collecting cup 1 when the water level of the water collecting cup 1 is lower than the preset water level 9, and floats up when the water level of the water collecting cup 1 reaches the preset water level 9.

[0025] In the drainage device provided by the present invention, the water separated by the oil-water separator is collected by the water collecting cup 1. When there is no water or very little water in the water collecting cup 1, the gravity of the float 2 is greater than the buoyancy of the accumulated water on the float 2. At this time, the float 2 sinks to the bottom of the water collecting cup 1, so that the sealing part 3 blocks the drainage port 1b of the water collecting cup 1.

[0026] When the water level in the water collection cup 1 rises and reaches the preset water level 9, the drainage volume of the float 2 increases. At this time, the buoyancy of the float 2 is greater than its gravity, so that the float 2 rises and the blocking part 3 opens the drainage port 1b. The adsorption structure adsorbs the float 2 and applies an upward adsorption force to the float 2. In this way, when the water collection cup 1 is draining, the float 2 will not sink and block the drainage port 1b just because the buoyancy is reduced to less than the gravity. Instead, with the help of the adsorption force, when the water in the water collection cup 1 drops to a certain water level, so that the sum of the buoyancy and adsorption force on the float 2 is less than the gravity, the float 2 will sink to the bottom of the water collection tank and block the drainage port 1b again.

[0027] Therefore, this solution, with the help of the cooperation of the float 2, the sealing part 3 and the adsorption structure 4, adopts buoyancy, gravity and adsorption force to control the start and end time of drainage. The structure is simple, reliable and low in cost. At the same time, increasing the adsorption force at the beginning of drainage can avoid the buoy 2 from falling and causing the drainage to be terminated, thereby ensuring stable drainage.

[0028] It should be understood that the density of the float 2 is less than the density of water, and the above-mentioned preset water level 9 is calibrated accordingly according to actual parameters. As long as the float 2 can rise when the preset water level 9 is reached, the blocking part 3 can be driven to open the drain port 1b.

[0029] It should be noted that the blocking portion 3 can be a blocking plug provided on the buoy 2 or a blocking seat provided on the buoy 2, as long as it can block and detach from the drain outlet 1b.

[0030] In one embodiment, the drain port 1b is located at the bottom of the water collecting cup 1, and the sealing portion 3 includes a sealing ring 31, which is disposed at the bottom of the float 2 and is arranged around the outer periphery of the drain port 1b when the float 2 sinks to the bottom of the water collecting cup 1.

[0031] In this embodiment, the drain outlet 1b is placed at the bottom of the water collecting cup 1, and the sealing ring 31 is placed at the bottom of the float 2 and corresponds to the drain outlet 1b. Therefore, when there is no water or less water in the water collecting cup 1, the float 2 is located on the drain outlet 1b and the drain outlet 1b is blocked by the sealing ring 31 to improve the sealing performance.

[0032] In one embodiment, the blocking portion 3 further includes a guide shaft 32, one end of which is connected to the bottom of the buoy 2 and is located in the middle of the sealing ring 31, and the other end of the guide shaft 32 extends into the drain port 1b.

[0033] In this embodiment, during the rising and sinking process of the buoy 2, the guide shaft 32 is always disposed in the drain port 1b to ensure that the sealing ring 31 can stably seal the drain port 1b. In addition, it should be noted that in this solution, the water inlet 1a is also placed on the top of the water collection cup 1.

[0034] In one embodiment, the sealing portion 3 also includes a plurality of support arms, which are connected to the guide shaft 32 and are spaced apart along the circumferential and axial directions of the guide shaft 32, and the ends of the support arms located in the drain outlet 1b are pressed against the side walls of the drain outlet 1b.

[0035] In this embodiment, a support arm is radially extended on the guide shaft 32 to support the side wall of the drain port 1b through the support arm, so as to prevent the buoy 2 from tilting while draining the drain port 1b, and ensure that the sealing ring 31 effectively seals the drain port 1b. It should be noted that the specific number of the support arms is not limited, as long as the guide shaft 32 is always located in the drain port 1b during the process of following the rise and fall of the buoy 2, thereby ensuring that the buoy 2 can rise and fall in a balanced manner, so that the sealing ring 31 can effectively seal the drain port 1b.

[0036] It should be noted that the specific setting form of the adsorption structure 4 is not limited, as long as it can apply the above-mentioned adsorption force to the float 2. In one embodiment, the adsorption structure 4 is set in the form of a suction cup. In another embodiment, the adsorption structure 4 is set in the form of a viscous adsorption component.

[0037] In one of the embodiments, the float structure also includes a matching magnet 5, which is arranged at the upper end of the float 2. The adsorption structure 4 includes an adsorption magnet 41, which is arranged in the water collecting cup 1 and is located above the float 2. When the float 2 floats up, it can magnetically attract the matching magnet 5 to apply an adsorption force to the float 2; wherein the adsorption force is less than the sum of the gravity of the float 2, the sealing portion 3 and the matching magnet 5.

[0038] In this embodiment, the float 2 is attracted by the magnetic force generated by the adsorption magnet 41 and the matching magnet 5 to ensure that the accumulated water in the water collecting cup 1 is drained to a low water level. Only then will the float 2 overcome the magnetic force and the smaller buoyancy driven by its own weight to ensure drainage efficiency.

[0039] In one embodiment, see Figure 4The water collecting cup 1 also has an air inlet 1c, which is located above the preset water level 9; the buoy structure also includes a connecting arm 6 and a baffle plate 7, one end of the connecting arm 6 is connected to the buoy 2, the baffle plate 7 is connected to the connecting arm 6, and is attached to the side wall of the water collecting cup 1 with the air inlet 1c, and is provided with a connecting port 7a, the connecting port 7a is offset from the air inlet 1c when the buoy 2 sinks to the bottom of the water collecting cup 1, and is connected to the air inlet 1c when the buoy 2 floats up; wherein the adsorption force is less than the sum of the gravity of the buoy 2, the sealing portion 3, the connecting arm 6 and the baffle plate 7.

[0040] In this embodiment, when the float 2 rises to the drainage position, the connecting port 7a is connected to the air inlet 1c on the water collection cup 1, so that the upper part of the water collection cup 1 is connected to the outside, so as to quickly drain the accumulated water in the water collection cup 1. When the float 2 sinks to the bottom of the water collection cup 1, the connecting port 7a is offset from the air inlet 1c, and the shielding plate 7 shields the air inlet 1c to ensure the sealing of the water collection cup 1.

[0041] In one embodiment, the drainage device also includes a partition 8, which is installed outside the side wall of the water collecting cup 1, and is surrounded by a cavity 8a with the part of the water collecting cup 1 where the air inlet 1c is provided, and is provided with a guide port 8b connected to the cavity 8a, and the guide port 8b is located between the preset water level 9 and the air inlet 1c.

[0042] In this embodiment, a partition 8 is further provided outside the air inlet 1c, and is connected to the air inlet 1c through the guide port 8b on the partition 8 to prevent the air inlet 1c from being directly connected to the outside, thereby preventing foreign matter from entering the water collection cup 1.

[0043] In one of the embodiments, a plurality of air inlets 1c are provided, and the plurality of air inlets 1c are evenly spaced along the circumference of the water collecting cup 1; a plurality of connecting arms 6 and a plurality of shielding plates 7 are provided respectively, and the plurality of connecting arms 6 are evenly spaced along the circumference of the float 2; a plurality of shielding plates 7 are respectively installed on the plurality of connecting arms 6, and correspond to the plurality of air inlets 1c.

[0044] In this embodiment, multiple air inlets 1c are provided, which, on the one hand, further improve the drainage efficiency, and on the other hand, multiple connecting arms 6 and shielding plates 7 can be evenly arranged on the buoy 2 to ensure the balance of the buoy 2 so that the buoy 2 can be lifted and lowered stably.

[0045] It should be noted that the specific number of the air inlets 1c is not limited, and can be two, three, or other numbers. In one embodiment, two air inlets 1c are symmetrically provided, and two groups of corresponding connecting arms 6 and shielding plates 7 are provided.

[0046] In addition, in another embodiment, the air inlet 1c is provided with one, but a counterweight is provided on the side of the buoy 2 opposite to the support arm to ensure the lifting balance of the buoy 2. At this time, the adsorption force is less than the sum of the gravity of the buoy 2, the support arm, the shielding plate 7 and the blocking part 3.

[0047] In addition, the present invention further provides a fuel system, the fuel system includes a drainage device as described in any one of the above. It should be noted that the detailed structure of the drainage device of the fuel system can refer to the embodiment of the drainage device described above, which will not be repeated here; since the drainage device described above is used in the fuel system of the present invention, the embodiment of the fuel system of the present invention includes all technical solutions of all embodiments of the drainage device described above, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0048] In order to better understand the present invention, the following Figures 1 to 4 The technical solution of the present invention is described in detail: In this solution, the float 2 in the drainage device is set inside the water collection cup 1. When the liquid level rises, the buoyancy of the float 2 increases, and the float 2 will rise. When the liquid level rises to a set height, the sealed drain port 1b at the bottom of the float 2 opens, and the top magnet is attracted at the same time to start draining, and the float 2 will not fall; when the liquid level drops to another set height, the buoyancy drops significantly, and the top suction is not enough to support the gravity of the float 2, and the float 2 falls, sealing the drain port 1b. The specific workflow is as follows: When there is no water or very little water in the water collecting cup 1, the sealing ring 31 at the bottom of the float 2 fits with the drain port 1b at the bottom of the water collecting cup 1, and no water is discharged; at the same time, the air inlet 1c on the upper side of the water collecting cup 1 is blocked by the shielding plate 7, and no air intake is required.

[0049] When the liquid level in the water collecting cup 1 rises, the drainage volume of the float 2 increases, and the buoyancy of the float 2 increases. When the liquid level rises to the set drainage level, the buoyancy F1 of the float 2 is greater than the gravity G of the float 2, and the float 2 rises, and its bottom sealing ring 31 rises accordingly, and the drainage port 1b opens. At the same time, the connecting port 7a on the shielding plate 7 connected to the float 2 coincides with the air inlet 1c on the side of the water collecting cup 1, and the outside air enters the liquid surface of the water collecting cup 1 through the guide port 8b, the cavity 8a, the air inlet 1c and the guide port 8b, and the drainage begins. In addition, the matching magnet 5 on the top of the float 2 and the adsorption magnet 41 on the top of the water collecting cup 1 are close to each other and adsorbed together to prevent the problem that the float 2 follows the drop of the liquid level during the drainage process and blocks the drainage port 1b.

[0050] As drainage continues, the liquid level drops and the buoyancy of the float 2 decreases. When the liquid level reaches the set position, the gravity of the float 2 exceeds the buoyancy of the float 2 and the magnetic attraction between the magnets, that is, the gravity G of the float 2 is greater than the sum of the buoyancy F1 of the float 2 and the magnetic attraction f. The float 2 drops, and its bottom sealing ring 31 blocks the drain outlet 1b, while driving the connecting arm 6 to drop. The connecting port 7a on the baffle plate 7 is offset from the air inlet 1c of the water collecting cup 1, and drainage stops.

[0051] Therefore, the device has a simple structure and low cost. The control method using physical principles has high reliability. The method of increasing the magnetic attraction at the beginning of drainage can effectively prevent the buoy 2 from falling and causing the drainage to stop. The shielding plate 7 moves up and down synchronously with the buoy 2, which can well control the opening and closing of the air inlet 1c.

[0052] It should be understood that the drainage device can be used not only in the fuel system but also in other fields requiring automatic drainage.

[0053] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A drainage device, characterized in that: include: A water collection cup having a water inlet and a water outlet; A float structure, comprising a float and a blocking portion, wherein the float is disposed in the water collecting cup and can float following the liquid level in the water collecting cup, and the blocking portion is disposed on the float and blocks the drain port when the float sinks to the bottom of the water collecting cup and opens the drain port when the float floats up; and The adsorption structure is installed on the water collecting cup and can adsorb the float when the float floats up, and exert an upward adsorption force on the float, wherein the adsorption force is less than the sum of the gravity of the float and the blocking part.

2. The drainage device according to claim 1, characterized in that: The drain port is located at the bottom of the water collecting cup, and the sealing portion includes a sealing ring, which is arranged at the bottom of the float and is arranged around the outer periphery of the drain port when the float sinks to the bottom of the water collecting cup.

3. The drainage device according to claim 2, characterized in that: The blocking portion further comprises a guide shaft, one end of which is connected to the bottom of the float and is located in the middle of the sealing ring, and the other end of which extends into the drain port.

4. The drainage device according to claim 3, characterized in that: The blocking portion also includes a plurality of support arms, which are connected to the guide shaft and spaced apart along the circumferential and axial directions of the guide shaft. The ends of the support arms located in the drain outlet are pressed against the side walls of the drain outlet.

5. The drainage device according to claim 1, characterized in that: The float structure also includes a matching magnet, which is arranged at the upper end of the float, and the adsorption structure includes an adsorption magnet, which is arranged in the water collecting cup and located above the float, and can magnetically attract the matching magnet when the float floats, so as to apply the adsorption force to the float; The adsorption force is smaller than the sum of the gravity of the float, the blocking portion and the matching magnet.

6. The drainage device according to claim 1, characterized in that: The water collecting cup also has an air inlet, and the air inlet is located above the water level when the buoy floats up; The buoy structure further includes a connecting arm and a shielding plate, one end of the connecting arm is connected to the buoy, the shielding plate is connected to the connecting arm and is attached to the side wall of the water collecting cup provided with the air inlet, and is provided with a connecting port, the connecting port is staggered from the air inlet when the buoy sinks to the bottom of the water collecting cup, and is connected to the air inlet when the buoy floats up; Wherein, the adsorption force is smaller than the sum of the gravity of the float, the blocking portion, the connecting arm and the shielding plate.

7. The drainage device according to claim 6, characterized in that: The drainage device also includes a partition, which is installed outside the side wall of the water collecting cup and surrounds a cavity with the part of the water collecting cup where the air inlet is provided, and is provided with a guide port connected to the cavity, and the guide port is located between the water level when the buoy floats up and the air inlet.

8. The drainage device according to claim 6, characterized in that: There are multiple air inlets, and the multiple air inlets are evenly spaced along the circumference of the water collecting cup; The connecting arms and the shielding plates are provided in multiple groups, respectively. The multiple groups of connecting arms are evenly spaced along the circumference of the buoy. The multiple shielding plates are respectively installed on the multiple connecting arms and correspond to the multiple air inlets.

9. The drainage device according to claim 1, characterized in that: The water inlet is located at the top of the water collecting cup.

10. A fuel system, characterized in that: Comprising a drainage device as described in any one of claims 1-9.

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