A fuel tank breather valve assembly and a contamination-proof fuel tank having the same.

Abstract

This application provides a fuel tank breather valve assembly and a contamination-proof fuel tank having the same. The fuel tank breather valve assembly includes a connecting pipe, a filter element, and an oil removal unit. The connecting pipe includes a first main pipe, a diversion pipe, and a second main pipe connected in sequence. The diversion pipe includes an exhaust channel section and an intake channel section, and uses a one-way exhaust valve and a one-way intake valve to divert the intake and exhaust gases. The filter element is sleeved on one end of the first main pipe, and the oil removal unit is connected to the end of the second main pipe away from the filter element. The oil removal unit is tapered, wider at the top and narrower at the bottom, with multiple air passages formed on its side and an opening for oil to flow out at its lower part. The fuel tank breather valve assembly of this invention can selectively remove impurities from the intake and exhaust gases by diverting them, thus improving the filter element's lifespan. Furthermore, since only one fuel tank breather valve assembly is used in this invention, it does not increase the processing difficulty of the fuel tank shell.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, specifically to an oil tank breather valve assembly and an anti-pollution oil tank having the same. Background Technology

[0002] During operation, the engine of the equipment needs to use a breathing device to connect the fuel tank to the outside in order to maintain the balance of air pressure inside and outside the fuel tank. When the air pressure inside the fuel tank drops, outside air enters the fuel tank, and when the air pressure inside the fuel tank rises, the air inside the fuel tank is discharged to the outside, thereby maintaining the balance of air pressure inside the fuel tank.

[0003] In existing technologies, most equipment fuel tanks are equipped with a breather with a filter element. Both the intake of outside air and the exhaust of air from inside the fuel tank are ensured through this single breather. When the equipment operates and experiences severe vibrations, the fuel in the tank produces a large amount of foam. Even if some devices can achieve oil-gas separation as much as possible, some oil droplets will still be carried by the gas and discharged through this single breather, causing some blockage and damage to the filter element. This makes it difficult to draw in and expel air. Furthermore, because the filter element is not functioning properly, the cleanliness of the intake air cannot be guaranteed again, potentially allowing impurities in the air to enter the fuel tank, contaminating the fuel and affecting the smooth operation of the engine. Summary of the Invention

[0004] In view of this, the present invention provides a fuel tank breather valve assembly to solve the problems of difficult fuel tank processing and excessively heavy fuel tank caused by having two breathers on the fuel tank in the prior art.

[0005] The present invention also provides a pollution-proof fuel tank.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] According to a first aspect of the present invention, a fuel tank breather valve assembly is provided on a fuel tank, the fuel tank breather valve assembly comprising:

[0008] A connecting pipe includes a first main pipe, a branch pipe, and a second main pipe connected in sequence. One end of the first main pipe is configured to extend outward from the fuel tank. The branch pipe includes an exhaust passage section and an intake passage section. A one-way exhaust valve is provided between the exhaust passage section and the first main pipe. The one-way exhaust valve opens / closes to control the connection / isolation between the exhaust passage section and the first main pipe. A one-way intake valve is provided between the intake passage section and the first main pipe. The one-way intake valve opens / closes to control the connection / isolation between the intake passage section and the first main pipe.

[0009] A filter element, which is fitted onto one end of the first main pipe;

[0010] The oil removal unit is connected at its upper part to the end of the second main pipe away from the filter element. The oil removal unit is tapered, wider at the top and narrower at the bottom. Multiple air holes are formed on the side of the oil removal unit, and the lower part of the oil removal unit has an opening for oil to flow out.

[0011] Furthermore, the one-way exhaust valve includes two valves, which are respectively located on both sides of the one-way intake valve.

[0012] Furthermore, the degreasing unit includes multiple layers of stacked discs, and the second main pipe is connected to the cavity structure of the innermost disc.

[0013] Furthermore, the vent holes on adjacent discs are arranged in an alternating pattern.

[0014] Furthermore, the side of the disc has multiple outwardly extending protrusions, the width of which gradually decreases along the direction from the inside of the disc toward the outside.

[0015] Furthermore, the vent is provided on the protrusion, and the diameter of the vent gradually decreases along the direction from the inside of the disc to the outside.

[0016] Furthermore, the fuel tank breather valve assembly in this embodiment of the invention further includes:

[0017] A bearing is sleeved on the end of the second main pipe away from the filter element;

[0018] An adapter, comprising a first adapter portion and a second adapter portion, wherein the first adapter portion is sleeved with the bearing and the second adapter portion is connected to the disc;

[0019] A connecting rod, the first end of which is provided with a plurality of intake rotary turbines, the intake rotary turbines being located below the one-way intake valve, and the second end of which is sleeved with the first adapter;

[0020] The one-way intake valve opens to allow the intake airflow to drive the intake rotary turbine to rotate, which in turn drives the connecting rod and the disc to rotate.

[0021] Furthermore, the second end is formed into a cylindrical shape that communicates with the second main pipe, the second end extends into the cavity structure, and the second end is provided with a through hole that communicates with the cavity structure.

[0022] Furthermore, the disc also includes:

[0023] A first connecting wing extends from the upper part of the oil removal unit and is connected to the inner wall of the second transition part.

[0024] The second connecting wing extends from the lower part of the oil removal unit, and the second end forms a plurality of connecting platforms. The second connecting wing is disposed between two adjacent connecting platforms.

[0025] According to a second aspect of the present invention, the anti-pollution fuel tank includes the fuel tank breather valve assembly described in any of the preceding claims.

[0026] The above-mentioned technical solution of the present invention has at least one of the following beneficial effects: The oil tank breather valve assembly of the present invention is used to be installed on the oil tank, including a connecting pipe, a filter element and an oil removal unit. The connecting pipe includes a first main pipe, a branch pipe and a second main pipe connected in sequence. One end of the first main pipe extends outward from the oil tank. The branch pipe includes an exhaust channel section and an intake channel section. A one-way exhaust valve is provided between the exhaust channel section and the first main pipe. The one-way exhaust valve opens / closes to control the connection / isolation between the exhaust channel section and the first main pipe. A one-way intake valve is provided between the intake channel section and the first main pipe. The one-way intake valve opens / closes to control the connection / isolation between the intake channel section and the first main pipe. The filter element is sleeved on one end of the first main pipe. The oil removal unit is connected to the end of the second main pipe away from the filter element. The oil removal unit is tapered with a wider top and a narrower bottom. The upper part of the oil removal unit is connected to an adapter. Multiple air holes are formed on the side of the oil removal unit. The lower part of the oil removal unit has an opening for oil to flow out. In other words, a diversion pipe, a one-way exhaust valve, and a one-way intake valve are installed within the connecting pipe to separate the intake and exhaust gases. This diversion allows for the targeted removal of impurities from both the intake and exhaust gases. Specifically, the filter element filters impurities from the intake gas, while the oil removal component filters out oil carried by the exhaust gas, thus preventing oil contamination of the filter element and extending its lifespan. Furthermore, since this invention only includes one fuel tank breather valve assembly, it does not increase the processing difficulty of the fuel tank housing. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the external structure of the anti-pollution fuel tank according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the overall structure of the fuel tank breather valve assembly according to an embodiment of the present invention;

[0029] Figure 3 This is a cross-sectional view of the anti-pollution fuel tank according to an embodiment of the present invention;

[0030] Figure 4 for Figure 3 Enlarged view of the local structure of A in the middle;

[0031] Figure 5 This is a schematic diagram of the oil removal unit in the fuel tank breather valve assembly according to an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the stacked discs in the fuel tank breather valve assembly according to an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the limiting nut of the fuel tank breather valve assembly according to an embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of the connecting rod in the fuel tank breather valve assembly according to an embodiment of the present invention;

[0035] Figure 9 This is a schematic diagram of the adapter in the fuel tank breather valve assembly according to an embodiment of the present invention;

[0036] Figure 10 This is a schematic diagram of the adapter in the fuel tank breather valve assembly according to another perspective of an embodiment of the present invention;

[0037] Figure 11 This is a schematic diagram of the connecting pipe in the fuel tank breather valve assembly according to an embodiment of the present invention;

[0038] Figure 12 This is a partial structural schematic diagram of the fuel tank breather valve assembly according to an embodiment of the present invention.

[0039] Figure label:

[0040] 100. Connecting pipe; 110. First main pipe; 120. Diversion pipe; 121. Exhaust passage section; 122. Intake passage section; 130. Second main pipe; 140. One-way exhaust valve; 150. One-way intake valve; 200. Filter element; 300. Oil removal unit; 310. Disc; 311. First connecting wing; 312. Second connecting wing; 320. Vent hole; 330. Opening; 340. Protrusion; 400. Bearing; 500. Adapter; 510. First adapter part; 520. Second adapter part; 600. Connecting rod; 610. First end; 611. Intake rotary turbine; 612. Connecting collar; 612a. Guide hole; 620. Second end; 621. Connecting platform; 630. Through hole; 700. Limit nut; 710. Boss; 001. Oil tank. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0042] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "connected" or "linked" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up," "down," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship also changes accordingly.

[0043] The following section will first combine the appendix. Figure 1-12 A specific description of a fuel tank breather valve assembly according to a first aspect embodiment of the present invention is provided. The fuel tank breather valve assembly includes a connecting pipe 100, a filter element 200, and an oil removal unit 300. The connecting pipe 100 includes a first main pipe 110, a branch pipe 120, and a second main pipe 130 connected in sequence. One end of the first main pipe 110 extends outward from the fuel tank 001. The branch pipe 120 includes an exhaust passage section 121 and an intake passage section 122. A one-way exhaust valve 140 is provided between the exhaust passage section 121 and the first main pipe 110. The one-way exhaust valve 140 opens / closes to control the connection between the exhaust passage section 121 and the first main pipe 130. A one-way air intake valve 150 is installed between the intake passage section 122 and the first main pipe 110 to control the connection / isolation of the intake passage section 122 and the first main pipe 110. The one-way air intake valve 150 opens / closes to control the connection / isolation of the intake passage section 122 and the first main pipe 110. A filter element 200 is sleeved on one end of the first main pipe 110. The upper part of the oil removal unit 300 is connected to the end of the second main pipe 130 away from the filter element 200. The oil removal unit 300 is tapered, wider at the top and narrower at the bottom. Multiple air passage holes 320 are formed on the side of the oil removal unit 300. The lower part of the oil removal unit 300 has an opening 330 for oil to flow out. That is to say, as Figure 1-4 , Figure 11-12 As shown, a diversion pipe 120, a one-way exhaust valve 140, and a one-way intake valve 150 are provided within the connecting pipe 100 to divert the intake and exhaust gases. This diversion allows for targeted removal of impurities from both the intake and exhaust gases. Specifically, the filter element 200 filters impurities from the intake gas, while the oil removal component filters out oil carried by the exhaust gas, thus preventing oil contamination of the filter element 200 and extending its lifespan. Furthermore, since only one oil tank breather valve assembly is used in this invention, the machining difficulty of the oil tank 001's shell is not increased.

[0044] More specifically, such as Figure 3As shown, the connection relationship of each component in the fuel tank breather valve assembly is as follows: A filter element 200, a connecting pipe 100, and an oil removal unit 300 are sequentially arranged from the outside to the inside of the fuel tank 001. The first main pipe 110 of the connecting pipe 100 is connected to the filter element 200. The shunt pipe 120 of the connecting pipe 100 is connected to the first main pipe 110. The shunt pipe 120 includes an exhaust passage section 121 and an intake passage section 122. A one-way exhaust valve 140 is arranged between the exhaust passage section 121 and the first main pipe 110. The exhaust passage section 121 is communicated with the second main pipe 130. A one-way intake valve 150 is arranged between the intake passage section 122 and the first main pipe 110. The intake passage section 122 is communicated with the second main pipe 130. Finally, the second main pipe 130 is connected to the oil removal unit 300.

[0045] In this embodiment, when the air pressure in the fuel tank 001 is too high and it is necessary to exhaust to the outside of the fuel tank 001, the outgoing gas passes through the through-hole 320 on the oil removal component and enters the cavity of the oil removal component, and then successively passes through the inner cavity of the second main pipe 130 and the exhaust passage section 121. The airflow of the outgoing gas presses on the one-way exhaust valve 140, causing the one-way exhaust valve 140 to open. At this time, the one-way intake valve 150 is in a closed state. The outgoing gas enters the first main pipe 110 and is discharged outside the fuel tank 001 through the filter element 200. During this process, since there is an oil removal component in the shape of a cone with a wider top and a narrower bottom, the oil carried by the outgoing gas can be separated from the outgoing gas. The separated oil slides down along the side wall of the oil removal component and returns to the fuel tank 001 through the opening 330 at the lower part of the oil removal component, thereby avoiding the oil carried by the outgoing gas from entering the filter element 200 and increasing the service life of the filter element 200.

[0046] When the air pressure in the fuel tank 001 is too low and it is necessary to intake air into the fuel tank 001, the intake gas first passes through the filter element 200. The filtered intake gas enters the first main pipe 110. The airflow of the intake gas presses on the one-way intake valve 150, causing the one-way intake valve 150 to open. At this time, the one-way exhaust valve 140 is in a closed state. The intake gas successively enters the intake passage section 122 and the second main pipe 130, and enters the fuel tank 001 through the through-hole 320 of the degassing unit. During this process, the intake gas can remove impurities under the action of the filter element 200, ensuring the cleanliness of the oil in the fuel tank 001.

[0047] Further, there are two one-way exhaust valves 140, which are respectively arranged on both sides of the one-way intake valve 150. That is to say, the connecting pipe 100 can be set in a "middle" shape structure. The "|" part in the "middle" shape structure can be the first main pipe 110, the intake passage section 122, and the second main pipe 130 connected in sequence, and the "□" part in the "middle" shape structure forms two exhaust passage sections 121. By setting two exhaust passage sections 121, the exhaust efficiency of the fuel tank 001 can be improved; it can also be as Figure 11 As shown, the branch pipe 120 is connected to the second main pipe 130, and the two are an integral connected structure.

[0048] It is easy to understand that the structure of the connecting pipe 100 is not specifically limited in this invention, such as... Figure 2 As shown, the connecting pipe 100 only needs to include a first main pipe 110, a branch pipe 120 and a second main pipe 130 arranged from top to bottom, and the branch pipe 120 includes an exhaust passage section 121 and an intake passage section 122 that are independent of each other.

[0049] Furthermore, the degreasing unit 300 includes multiple layers of stacked discs 310, and the second main pipe 130 is connected to the cavity structure of the innermost disc 310. That is to say, as... Figure 3-6 As shown, by setting up multiple layers of discs 310, the exhaust gas and the oil carried by the exhaust gas are separated by the multiple layers of discs 310, thereby improving the oil removal effect.

[0050] Furthermore, the vent holes 320 on adjacent discs 310 are staggered. That is, after the exhaust gas passes through the vent hole 320 on the outermost disc 310, it enters the vent hole 320 on the innermost disc 310. The staggered arrangement of the vent holes 320 on each layer can extend the path of the exhaust gas from the oil tank 001 into the cavity structure of the oil removal unit 300, thereby further improving the oil removal effect.

[0051] Furthermore, multiple outwardly extending protrusions 340 are formed on the side of the disc 310, and the width of the protrusions 340 gradually decreases along the direction from the inside of the disc 310 towards the outside. That is to say, as... Figure 5-6 As shown, by forming a protrusion 340 on the side of the disc 310, two adjacent discs 310 can be spaced apart, which facilitates the flow of exhaust gas and intake gas between the discs 310 and improves exhaust and intake efficiency; at the same time, the protrusion 340, whose width gradually decreases along the direction from the inside of the disc 310 to the outside, can improve the separation effect of exhaust gas and the oil carried by the exhaust gas.

[0052] Furthermore, the vent 320 is provided on the protrusion 340, and the diameter of the vent 320 gradually decreases along the direction from the inside of the disc 310 towards the outside. That is to say, as... Figure 5-6 As shown, by setting an air vent 320 with a gradually decreasing diameter along the direction from the inside of the disc 310 to the outside, it is easier for the intake gas to enter the oil tank 001 from the cavity structure of the degassing unit, thereby improving the intake efficiency.

[0053] Furthermore, the fuel tank breather valve assembly of this embodiment also includes a bearing 400, an adapter 500, and a connecting rod 600. The bearing 400 is sleeved on the end of the second main pipe 130 away from the filter element 200. The adapter 500 includes a first adapter portion 510 and a second adapter portion 520. The first adapter portion 510 is sleeved with the bearing 400, and the second adapter portion 520 is connected to the disc 310. The first end 610 of the connecting rod 600 is provided with a plurality of intake rotary turbines 611. The intake rotary turbines 611 are located below the one-way intake valve 150. The second end 620 of the connecting rod 600 is sleeved with the first adapter portion 510. The one-way intake valve 150 is opened to allow the intake airflow to drive the intake rotary turbines 611 to rotate, and in turn drive the connecting rod 600 and the disc 310 to rotate. That is to say, as Figure 2-3 , Figure 8-10 As shown, the second main pipe 130 is arranged radially inward with a bearing 400, a first adapter 510, and a connecting rod 600. The first end 610 of the connecting rod 600 is provided with multiple intake rotary turbines 611. The intake rotary turbines 611 on the first end 610 extend into the intake channel section 122 and are located below the one-way intake valve 150. After the intake gas enters the first main pipe 110, the airflow opens the valve of the one-way intake valve 150 and enters the intake channel section 122. Then, the airflow of the intake gas exerts force on the intake rotary turbines 611 on the first end 610 of the connecting rod 600, causing the connecting rod 600 to rotate. After the connecting rod 600 rotates, it drives the bearing 400, the adapter 500, and the disc 310 to rotate. As a result, the oil that is retained and adhered to the air passage 320 of the disc 310 is detached from the side of the disc 310 and drips into the oil tank 001 under the action of centrifugal force. In other words, by setting up the bearing 400, adapter 500 and connecting rod 600, the airflow of the intake gas can drive the connecting rod 600 to rotate during intake, thereby driving the disc 310 to rotate, which can clean the disc 310, thereby further removing the oil on the disc 310 and further improving intake and exhaust efficiency.

[0054] Furthermore, the second end 620 forms a cylindrical shape communicating with the second main pipe 130, and the second end 620 extends into the cavity structure, with a through hole 630 communicating with the cavity structure. That is to say, as... Figure 8 As shown, by providing a through hole 630 at the second end 620 of the connecting rod 600, the cavity structure of the disc 310 is connected to the cylindrical cavity at the second end 620 through the through hole 630, thereby further improving the intake efficiency.

[0055] It is worth noting that, such as Figure 7As shown, a limiting nut 700 can also be fitted at the end of the second end 620 to ensure the reliability of the rotation of the connecting rod 600. Multiple bosses 710 are provided at intervals at the end of the limiting nut 700 near the oil removal unit 300. The bosses 710 are used to prevent the limiting nut 700 from blocking the opening 330 at the bottom of the disc 310, so as to ensure that the oil flows out smoothly.

[0056] like Figure 8 As shown, the first end 610 is also formed into a cylindrical shape that communicates with the second end 620. The first end 610 also includes a connecting collar 612 located near the bearing 400. The connecting collar 612 is provided with a guide hole 612a that communicates with the air intake channel section 122. The intake gas enters the cylindrical structure of the second end 620 through the guide hole 612a. The second end 620 has a through hole 630 and finally enters the cavity structure of the disc 310.

[0057] Furthermore, the disc 310 also includes a first connecting wing 311 and a second connecting wing 312. The first connecting wing 311 extends and is disposed on the upper part of the degreasing unit 300, and is connected to the inner wall of the second transition part 520. The second connecting wing 312 extends and is disposed on the lower part of the degreasing unit 300. The second end 620 forms a plurality of connecting platforms 621, and the second connecting wing 312 is disposed between two adjacent connecting platforms 621. That is, as Figure 5-6 As shown, the reliability of disk 310 installation can be improved by providing a first connecting wing 311 and a second connecting wing 312 on disk 310.

[0058] According to a second aspect embodiment of the present invention, such as an anti-pollution fuel tank Figure 1 As shown, including the above-mentioned oil tank breather valve assembly, by setting the above-mentioned oil tank breather valve assembly on the housing of oil tank 001, it is possible to avoid oil contamination of filter element 200 carried in the exhaust gas, thereby improving the service life of filter element 200. Furthermore, since only one oil tank breather valve assembly is set on the housing of oil tank 001 in this embodiment of the invention, the amount of processing of the housing can be simplified and the processing difficulty can be reduced.

[0059] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A fuel tank breather valve assembly, for installation on a fuel tank (001), characterized in that, include: A connecting pipe (100) includes a first main pipe (110), a branch pipe (120), and a second main pipe (130) connected in sequence. One end of the first main pipe (110) is configured to extend outward from the oil tank (001). The branch pipe (120) includes an exhaust passage section (121) and an intake passage section (122). A one-way exhaust valve (140) is provided between the exhaust passage section (121) and the first main pipe (110). The one-way exhaust valve (140) opens / closes to control the connection / isolation between the exhaust passage section (121) and the first main pipe (110). A one-way intake valve (150) is provided between the intake passage section (122) and the first main pipe (110). The one-way intake valve (150) opens / closes to control the connection / isolation between the intake passage section (122) and the first main pipe (110). A filter element (200) is fitted onto one end of the first main pipe (110); An oil removal unit (300) is provided, the upper part of which is connected to the end of the second main pipe (130) away from the filter element (200). The oil removal unit (300) is tapered with a wider top and a narrower bottom. Multiple air passages (320) are formed on the side of the oil removal unit (300). The lower part of the oil removal unit (300) has an opening (330) for oil to flow out. The degreasing unit (300) includes multiple layers of stacked discs (310), and the second main pipe (130) is connected to the cavity structure of the innermost disc (310). Also includes: A bearing (400) is sleeved on the end of the second main pipe (130) away from the filter element (200); The adapter (500) includes a first adapter part (510) and a second adapter part (520), the first adapter part (510) being sleeved with the bearing (400) and the second adapter part (520) being connected to the disc (310); A connecting rod (600) has a first end (610) provided with a plurality of intake rotary turbines (611), the intake rotary turbines (611) being located below the one-way intake valve (150), and the second end (620) of the connecting rod (600) being sleeved with the first adapter (510). The one-way intake valve (150) is opened to allow the intake airflow to drive the intake rotary turbine (611) to rotate, and in turn drive the connecting rod (600) and the disc (310) to rotate. The one-way exhaust valve (140) includes two valves, which are respectively located on both sides of the one-way intake valve (150); The vents (320) on two adjacent discs (310) are staggered. The side of the disc (310) forms a plurality of outwardly extending protrusions (340), the width of which gradually decreases along the direction from the inside of the disc (310) toward the outside. The vent (320) is provided on the protrusion (340), and the diameter of the vent (320) gradually decreases along the direction from the inside of the disc (310) toward the outside.

2. The fuel tank breather valve assembly according to claim 1, characterized in that, The second end (620) forms a cylindrical shape that communicates with the second main pipe (130), the second end (620) extends into the cavity structure, and the second end (620) is provided with a through hole (630) that communicates with the cavity structure.

3. The fuel tank breather valve assembly according to claim 2, characterized in that, The disc (310) also includes: A first connecting wing (311) extends from the upper part of the oil removal unit (300) and is connected to the inner wall of the second adapter (520). The second connecting wing (312) extends and is disposed at the lower part of the oil removal unit (300). The second end (620) forms a plurality of connecting platforms (621). The second connecting wing (312) is disposed between two adjacent connecting platforms (621).

4. A pollution-proof fuel tank, characterized in that, Includes the fuel tank breather valve assembly according to any one of claims 1 to 3.

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