KR20220063588A - Multistage Filtering Apparatus with Function of Coalescing water and Removing particles for Helicopter Refuelling System - Google Patents

Abstract

The present invention relates to a multi-stage filtering apparatus for a helicopter refueling system having oil-water separation and foreign matter removal functions. More particularly, the present invention relates to a filtering apparatus that is installed on a helicopter refueling system, effectively performs oil-water separation and foreign matter removal to improve the quality of fuel oil supplied to a helicopter, and, together with this, can minimize space limitations and cost burden when installed on the helicopter refueling system, as well as secure management efficiency.

Description

Multistage Filtering Apparatus with Function of Coalescing water and Removing particles for Helicopter Refueling System

The present invention relates to a multi-stage filtering device for a helicopter fueling system having oil-water separation and foreign matter removal functions, and more particularly, to effectively separate oil-water and foreign matter in order to increase the quality of fuel oil installed on the helicopter oil supply system and supplied to the helicopter. It relates to a filtering device that can minimize space constraints and cost burden when installed on a helicopter refueling system, as well as secure management efficiency.

In general, merchant ships such as large container ships and oil tankers, special ships, drill ships, and offshore plants such as FPSO (Floating Production Storage and Offloading) stay or move in distant seas for a long period of time. Helicopter operation is required as an efficient and rapid means of transportation.

Accordingly, in ships and offshore plants, helidecks are installed at the bow or stern for helicopters to take off and land, and the helicopters take off and land using the helidecks.

Helideck, a helicopter take-off and landing facility suitable as a means of transport between sea and land, is essentially equipped with a helicopter refueling system to inject fuel into helicopters taking off and landing.

Korean Patent No. 10-0775276 discloses a technology related to an aircraft refueling device having a circulation line that can improve fuel quality because fuel is filtered during fuel refueling and draining to aircraft fuel tanks, flushing pipes, and fuel storage Korea Patent No. 10-1270544 can refuel a helicopter with high-purity fuel, and can actively cope with various problems such as abnormal pressure and fire that may occur in the helicopter refueling system. A technology has been known for a helicopter refueling system that has sufficient strength and safety to be suitable for use in sea with the present conditions.

As such, the conventional helicopter refueling system includes an oil-water separator that removes moisture (water) contained in fuel oil in order to improve the quality by increasing the purity of fuel oil supplied to the helicopter, and a filtering device for removing particulate foreign substances in the fuel However, since these devices are individually installed on the supply line of the oil supply system, the burden of installation cost increases, and there is a problem in that space restrictions occur when installing the oil supply system due to securing the occupied area for each equipment.

In addition, since the oil-water separator and the filtering device are separately provided on the supply line of the oil supply system, they must be managed for each device during maintenance and repair, thereby causing inefficiency in management work.

Republic of Korea Patent Publication No. 10-0775276 (2007.11.02.) Republic of Korea Patent Publication No. 10-1270544 (2013.05.28.)

The present invention has been devised to solve the above problems, and an object of the present invention is to be installed on a helicopter refueling system to effectively perform oil-water separation and foreign matter removal of fuel oil supplied to the helicopter, and to be installed on the helicopter refueling system It is possible to provide a multi-stage filtering device for a helicopter refueling system having functions of oil-water separation and foreign matter removal that can minimize time-space constraints and cost burden as well as secure management efficiency.

Objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those of ordinary skill in the art from the following description.

In order to achieve the above object, the present invention is a device installed on a helicopter refueling system to perform filtering to remove moisture and foreign substances contained in fuel oil, and forms the appearance of the device, and is formed at one lower end and upper end, respectively. a body portion having an inlet through which the fuel oil is introduced and an outlet through which the filtered fuel oil is discharged by circulating therein; Installed inside the body, the inner part of the body is divided into an inlet and a discharge compartment so that the fuel oil introduced into the body and the fuel oil that is filtered and discharged are not mixed, and a first opening formed through the inlet compartment. And a partition member having a second opening formed through the discharge compartment side; Installed in the body, one end is coupled to the first opening so as to be located on the rear side of the bulkhead member to communicate with the inlet compartment, and the fuel oil flowing into the body through the inlet and passing through the inlet compartment passes through a first filter member for removing moisture by performing oil-water separation by aggregating water contained in the fuel oil and at the same time separating and removing particulate foreign substances contained in the fuel oil; and installed in the body, located behind the bulkhead member and installed above the first filter member, one end coupled to the second opening to communicate with the discharge compartment, and primary through the first filter member a second filter member for separating and removing particulate foreign substances remaining in the fuel oil while at the same time removing moisture by performing oil-water separation by passing the fuel oil from which moisture and foreign substances have been removed to agglomerate the water remaining in the fuel oil; It is possible to provide a multi-stage filtering device for a helicopter refueling system having a function of oil-water separation and foreign matter removal comprising a.

At this time, the partition member includes a horizontal partition wall member installed horizontally on the inner front end of the body to partition the front end of the body into an inlet compartment and an outlet compartment, and a rear end of the horizontal partition member to be positioned on the inner front end of the body It is characterized in that it is provided with a vertical bulkhead member installed vertically in the lower end, the first opening is formed through, and the second opening is formed through the upper end.

In addition, the first filter member is made of a glass fiber material, is formed in a hollow cylindrical shape with an open longitudinal end and a plurality of pleats formed on a circumferential surface, and is applied to the fuel oil introduced into the interior through the open end. It is characterized in that the water contained in the water is agglomerated to form droplets, separated and removed from the fuel oil, and at the same time, particulate foreign substances contained in the fuel oil are filtered out, and the fuel oil from which water and foreign substances are removed is discharged to the outside. .

On the other hand, the second filter member, a polytetrafluoroethylene (polytetrafluoroethylene, PTFE)-coated metal mesh network has a hollow cylindrical shape forming a circumferential surface, and located inside the outer filter material, the circumferential surface is It is made of an inner filter material of a glass fiber material formed in a corrugated hollow cylindrical shape, and the fuel oil discharged from the first filter member flows in from the outside to the inside, and passes through the outer filter material and the inner filter medium sequentially, and the Water contained in fuel oil is agglomerated to form droplets, separated and removed from the fuel oil, and particulate foreign substances remaining in the fuel oil do not pass through the pores of the outer filter material and the inner filter material, so that they are removed from the fuel oil characterized.

On the other hand, it is installed inside the second filter member and is made of any one of a non-woven fabric and a pulp material containing a super absorbent polymer to selectively absorb only the water remaining in the fuel oil that has passed through the second filter member and is contained in the fuel oil. It is characterized in that it further comprises a moisture absorbent for removing moisture.

In addition, one side is fixed to one side of the inner circumferential surface of the body part, and the other end is coupled to the other end of the first filter member or the other end of the second filter member to fix the first filter member or the second filter member to the body part. It is characterized in that it further comprises a member.

The present invention is installed on a helicopter refueling system and can effectively perform oil-water separation and foreign matter removal of fuel oil supplied to a helicopter, and can minimize space constraints and cost burden when installed on a helicopter refueling system, as well as This has the advantage of ensuring efficiency.

1 is a side cross-sectional view of a multi-stage filtering device for a helicopter fueling system having a function of separating oil and water and removing foreign substances according to a preferred embodiment of the present invention.
Fig. 2 is a cross-sectional view taken along line A-A' of Fig. 1;
3 is a cross-sectional view taken along line B-B' of FIG. 1;
4 is a perspective sectional view schematically showing a first filter member of a multi-stage filtering device for a helicopter fueling system having a function of separating oil and water and removing foreign substances according to a preferred embodiment of the present invention.
5 is a perspective cross-sectional view schematically showing a second filter member of a multi-stage filtering device for a helicopter refueling system having a function of separating oil and water and removing foreign substances according to a preferred embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims.

With reference to the accompanying drawings will be described in detail for the implementation of the present invention. Irrespective of the drawings, like reference numbers refer to like elements, and "and/or" includes each and every combination of one or more of the recited items.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from another. Accordingly, it goes without saying that the first component mentioned below may be the second component within the spirit of the present invention.

The terminology used herein is for the purpose of describing the embodiments, and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and/or “comprising” does not exclude the presence or addition of one or more other components in addition to the stated components.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a side cross-sectional view of a multi-stage filtering device for a helicopter fueling system having a function of separating oil and water and removing foreign substances according to a preferred embodiment of the present invention.

1, the multi-stage filtering device 100 for a helicopter refueling system according to the present invention is installed on the helicopter refueling system to perform filtering to remove moisture and foreign substances contained in fuel oil, and is largely a body part (10), a partition member 20, a first filter member 30, and a second filter member 40.

First, the body portion 10 is formed of a hollow structure sealed on all sides to form the exterior of the filtering device 100, and at one upper end and lower end, a fuel supply line provided so that the fuel oil is transferred from the helicopter refueling system; An inlet 14 and an outlet 15 communicating with each other are formed.

Specifically, the body portion 10 includes a shell portion 11 having a hollow cylindrical shape with both end surfaces in the axial direction open, and the shell portion ( 11) and a front end head portion 12 and a rear end head portion 13 having a hollow hemispherical shape for closing the inner space.

At this time, the inlet 14 is formed at the lower end of the shear head 12 to provide a flow path for the fuel oil to flow into the body 10, and the upper end of the shear head 12 has the A discharge port 15 is formed to provide a flow path so that the fuel oil filtered by circulating inside the body portion 10 can be discharged on the fuel supply line.

In addition, the lower end of the shell portion 11 is formed with a tubular water collecting pipe 18 capable of opening and closing the lower surface.

The fuel oil from which foreign substances and moisture are primarily removed through the first filter member 30 to be described later stays inside the shell part 11 until it passes through the second filter member 40 to be described later. At this time, the Moisture that has not been filtered by the first filter member 30 and discharged together with the fuel oil, ie, water, is collected at the lower end of the shell part 11 due to a specific gravity difference with the fuel oil and collected in the water collecting pipe 18. do.

Accordingly, the water separated from the fuel oil by the specific gravity difference and accumulated in the water collecting pipe 18 can be separated and discharged at any time by opening the lower surface of the water collecting pipe 18 .

Next, the partition member 20 is positioned at the inner front end of the body portion 10 to fix the first filter member 30 and the second filter member 40 to the inside of the body portion 10 . At the same time, it serves to partition the inner front end of the body portion 10 so that the fuel oil introduced into the body portion and the fuel oil filtered and discharged are not mixed.

Specifically, the partition member 20 includes a horizontal partition member 21 installed horizontally on the inner front end of the body 10, and a rear end of the horizontal partition member 21 on the inner front end of the body. It consists of a vertical bulkhead member (22) installed vertically.

The horizontal bulkhead member 21 is a flat plate having a semi-circular shape, is installed inside the shear head part 12, is disposed to be parallel to the central axis of the shell part 11, and has an outer periphery of the shear head part 12 It is fixed in close contact with the inner periphery to partition the front end of the body portion 10 up and down.

In addition, the vertical bulkhead member 22 is a flat plate having a shape corresponding to the inner periphery of the body part 10, and is located at the rear end of the horizontal bulkhead member 21 in a state perpendicular to the central axis of the shell part 11. It is fixed in close contact and divides the inside of the body part 10 together with the horizontal bulkhead member 21 so that an inflow compartment 16 is formed at the inner lower end of the front end of the body 10, the front end of the body 10 The discharge compartment 17 is formed in the upper inner part of the part.

At this time, a first opening 23 is formed through the lower end of the vertical bulkhead member 22 so that the inlet compartment 16 and the space behind the vertical bulkhead member 22 communicate with each other, and at the upper end, the discharge compartment 17 and A second opening 25 is formed through the vertical partition wall member 22 so that the rear space communicates with each other.

Next, the first filter member 30 and the second filter member 40 are installed inside the body portion 10, preferably in the space behind the partition member 20, and form a multistage to form the inlet ( Filtering is performed to remove moisture and foreign substances from the fuel oil flowing into the body portion 10 through 14) and passing through the inlet compartment 16 .

Specifically, first, the first filter member 30 has one end fixedly coupled to the first opening 23 so as to communicate with the inlet compartment 17, and passes the fuel oil through the fuel oil contained in the fuel oil. Oil-water separation is performed by agglomeration of water to remove moisture and at the same time separate and remove particulate foreign substances contained in the fuel oil.

On the other hand, the second filter member 40 is disposed on the upper side of the first filter member 30 and has one end fixedly coupled to the second opening 25 so as to communicate with the discharge compartment 18 , 1 By passing the fuel oil from which moisture and foreign substances have been primarily removed through the filter member 30, the water remaining in the fuel oil that has not been filtered in the first filter member 30 is aggregated to perform oil-water separation. At the same time as removing moisture, particulate foreign matter remaining in the fuel oil that has not been filtered through the first filter member 30 is separated and removed.

FIG. 2 is a cross-sectional view taken along line A-A' of FIG. 1 .

As shown in FIG. 2 , the first opening 23 and the second opening 25 have a first coupling to facilitate the installation of the first filter member 30 or the second filter member 40 . A support 24 and a second coupling support 26 are formed, respectively.

First, the first coupling support 24 is formed in a Y or X shape on the first opening 23, a fastening hole 24-1 is formed through the central portion, and the first filter member ( 30), one end of the first filter member 30 is fixedly coupled to the first opening 23 by being fastened with a nut through the fastening hole 24-1. At the same time, it is possible to secure a flow path so that the fuel oil flows from the inlet compartment 16 toward the inside of the first filter member 30 .

In addition, the second coupling support 26 is formed in a Y-shape or X-shape on the second opening 23, a fastening hole 26-1 is formed through the central portion, and the second filter member ( 40), one end of the second filter member 40 is fixedly coupled to the second opening 25 by being fastened with the nut through the fastening hole 26-1. At the same time, it is possible to secure a flow path so that the fuel oil flows from the second filter member 40 toward the discharge compartment 17 .

In this case, the first coupling support 24 and the second coupling support 26 are preferably formed integrally with the partition member 20 , that is, the vertical partition member 22 , but the present invention is not limited thereto.

3 is a cross-sectional view taken along line B-B' of FIG. 1 .

3 , the filtering device 100 further includes a fixing member 50 for fixing the first filter member 30 or the second filter member 40 to the body portion 10 . can do.

One side of the fixing member 50 is fixed to one side of the inner circumferential surface of the body 10, and the other end is coupled to the other end of the first filter member 30 or the other end of the second filter member 40 to the first filter member. The other end of 30 or the other end of the second filter member 40 is fixed to and supported by the body portion 10 .

When only one end of the first filter member 30 and the second filter member 40 is fixed to the partition member 20, the first filter member 30 and the second filter member 40 Each other end of the is in a floating state in the air, so that damage to the first filter member 30 or the second filter member 40 fixed to the partition wall member 20 may occur, the fixing member 50 Thus, the other end of the first filter member 30 and the other end of the second filter member 40 are supported and fixed to the body portion 10 to prevent damage.

4 is a perspective cross-sectional view schematically showing a first filter member of a multi-stage filtering device for a helicopter fueling system having oil-water separation and foreign matter removal functions according to a preferred embodiment of the present invention.

As shown in FIG. 4 , the first filter member 30 is a coalescer filter in which a flow of fluid occurs from the inside to the outside, and a fiber material having a hollow cylindrical shape ( 31), a first end cap 33 coupled to one end of the filter medium 31, and a second end cap 35 coupled to the other end of the filter medium 31.

Here, the filter medium 31 has a circumferential surface folded in a zigzag manner to form a number of wrinkles, and is made of sponge, cotton, gold mesh, glass fiber, and ceramics baked at a low temperature without applying glaze, preferably made of glass fiber material. is done

In addition, the first end cap 33 has one side formed in a shape corresponding to the first coupling support 24 so that the fuel oil can pass therethrough, and the screw coupling part having a screw thread formed on the outer periphery in the central part of one side. 34 is formed so that the first filter member 30 can be easily installed on the filtering device 100 .

In addition, the second end cap 35 is installed at the other end of the first filter member 30 so that the fuel oil can be integrated into the first filter member 30 inside the first filter member 30 . It serves to close the other end of the

In other words, the fuel oil introduced into the first filter member 30 through one end of the first filter member 30 partially opened by the first end cap 33 is applied to the first filter. The fuel oil is accumulated on the inside of the member 30 , and the fuel oil passes through the filter medium 31 by gravity and is discharged toward the outside of the first filter member 30 , and at the same time, water contained in the fuel oil passes through the filter medium 31 . ) is separated from the fuel oil by agglomeration on the inner circumferential surface to form droplets.

At the same time, particulate foreign substances contained in the fuel oil do not pass through the filter medium 31 and are filtered out.

In this case, a tubular perforated tube body 32 having a plurality of perforations formed on a circumferential surface thereof is additionally provided inside the filter medium 31 to increase the foreign matter removal rate of the first filter member 30 .

5 is a perspective cross-sectional view schematically showing a second filter member of a multi-stage filtering device for a helicopter refueling system having oil-water separation and foreign matter removal functions according to a preferred embodiment of the present invention.

As shown in FIG. 5 , the second filter member 40 is a coalescer filter having a dual structure in which a flow of fluid occurs from the outside to the inside, and is hollow made of a metal mesh. a cylindrical outer filter material 41, the inner filter material 42 of a fiber material positioned inside the outer filter material 41 and having a hollow cylindrical shape, and a first coupled to one end of the second filter member 40 It includes an end cap (45) and a second end cap (47) coupled to the other end of the second filter member (40).

Here, the mesh network constituting the outer filter material 41 is coated with polytetrafluoroethylene (PTFE) called Teflon on the surface to impart hydrophobicity to the outer filter material 41, and through this, Water remaining in the fuel oil that has not been filtered by the first filter member 30 is aggregated on the outer circumferential surface of the outer filter material 41 and separated from the fuel oil.

The inner filter material 42 filters the fuel oil that has passed through the outer filter material 41 again, and the circumferential surface is folded in a zigzag manner to form a number of wrinkles, and sponge, cotton, gold mesh, glass fiber, and glaze are used. It is made of pottery baked at a low temperature without being painted, and preferably made of a glass fiber material.

In addition, the first end cap 45 has one side formed in a shape corresponding to the second coupling support 26 so that the fuel oil can be discharged, and a screw thread is formed on the outer periphery in the central portion of one side. A portion 46 is formed so that the second filter member 40 can be easily fixedly installed on the filtering device 100 .

At the same time, the second end cap 47 is installed at the other end of the second filter member 40 so that the filtered fuel oil is discharged only from one end of the second filter member 40 . It serves to close the other end.

In other words, the fuel oil discharged from the first filter member 30 is introduced from the outside to the inside of the second filter member 40, and the outer filter material 41 and the inner filter material 42 are sequentially applied. Water remaining in the fuel oil while passing through the fuel oil is agglomerated on the outer peripheral surfaces of the outer filter material 41 and the inner filter material 42 to form droplets, thereby being separated and removed from the fuel oil, and at the same time, the particulate form remaining in the fuel oil Also, foreign substances of the outer filter material 41 and the inner filter material 42 do not pass through the air gap and are filtered out from the fuel oil. The fuel oil that has been filtered through the third to third is discharged through the opening of the first end cap 44 .

In this case, a tubular perforated tube body 43 having a plurality of perforations formed on a circumferential surface thereof is additionally provided inside the inner filter material 42 to increase the foreign matter removal rate of the second filter member 40 .

In addition, the inside of the second filter member 40, that is, the inside of the inner filter medium 42, a moisture absorbent 44 having a hollow cylindrical shape made of a nonwoven fabric or pulp material containing a super absorbent polymer (SAP). ) can be further provided,

The moisture absorbent 44 is located inside the inner filter medium 42 and selectively absorbs only the water remaining in the fuel oil that has passed through the outer filter material 41 and the inner filter material 42 sequentially, and is contained in the fuel oil. By finally removing moisture, it is possible to increase the efficiency of the filtering device 100 .

Although embodiments of the present invention have been described with reference to the above and the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can practice the present invention in other specific forms without changing its technical spirit or essential features. You will understand that there is Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

10: body part
11: shell part
12: shear head part
13: rear end head
14: inlet
15: outlet
16: inlet compartment
17: exhaust compartment
20: bulkhead member
21: horizontal bulkhead member
22: vertical bulkhead member
23: first opening
24: first bonding support
25: second opening
26: second bonding support
30: first filter member
31: filter medium
32: perforated tube body
33: first end cap
34: screwed part
35: second end cap
40: second filter member
41: outer filter medium
42: inner filter medium
43: perforated tube body
44: moisture absorbent material
45: first end cap
46: screwed part
47: second end cap
50: fixing member

Claims (6)

In an apparatus installed on a helicopter refueling system to perform filtering to remove moisture and foreign substances contained in fuel oil,
a body portion forming an exterior of the device and having an inlet through which the fuel oil is introduced and an outlet through which the filtered fuel oil is discharged by circulating in the lower end and upper end of one side, respectively;
Installed inside the body, the inner part of the body is divided into an inlet and a discharge compartment so that the fuel oil introduced into the body and the fuel oil that is filtered and discharged are not mixed, and a first opening formed through the inlet compartment. And a partition member having a second opening formed through the discharge compartment side;
Installed in the body, one end is coupled to the first opening so as to be located on the rear side of the bulkhead member to communicate with the inlet compartment, and the fuel oil flowing into the body through the inlet and passing through the inlet compartment passes through a first filter member for removing moisture by performing oil-water separation by aggregating water contained in the fuel oil and at the same time separating and removing particulate foreign substances contained in the fuel oil; and
Installed in the body portion, located behind the partition member, installed above the first filter member, one end coupled to the second opening to communicate with the discharge compartment, and primarily through the first filter member A second filter member for separating and removing particulate foreign substances remaining in the fuel oil while removing moisture by performing oil-water separation by passing the fuel oil from which moisture and foreign substances have been removed and coagulating the water remaining in the fuel oil; A multi-stage filtering device for a helicopter refueling system with oil-water separation and foreign matter removal functions, including: According to claim 1,
The partition member is
a horizontal partition member installed horizontally on the inner front end of the body to partition the front end of the body into an inlet compartment and an outlet compartment;
It is located at the rear end of the horizontal bulkhead member and is vertically installed on the inner front end of the body, the first opening is formed through the lower end, and the second opening is formed through the upper end of the vertical barrier member, characterized in that it is provided. A multi-stage filtering device for a helicopter fueling system with oil-water separation and foreign matter removal functions. According to claim 1,
The first filter member,
It is made of a glass fiber material, is formed in a hollow cylindrical shape with an open longitudinal end and a number of wrinkles on the circumferential surface, and agglomerates water contained in the fuel oil introduced into the interior through the open end to form droplets Helicopter with oil-water separation and foreign matter removal function, characterized in that the fuel oil is separated and removed from fuel oil by inducing it to achieve, and at the same time filters particulate foreign substances contained in the fuel oil, and discharges the fuel oil from which water and foreign substances are removed to the outside Multi-stage filtering device for oil supply system. According to claim 1,
The second filter member,
Polytetrafluoroethylene (PTFE)-coated metal mesh mesh formed in a hollow cylindrical shape forming a circumferential surface, and a hollow cylindrical shape positioned inside the outer filter material and having a corrugated circumferential surface It is made of the inner filtration material of the material,
The fuel oil discharged from the first filter member flows in from the outside to the inside, passes through the outside filter medium and the inside filter medium sequentially, and the water contained in the fuel oil is agglomerated to form droplets and separated from the fuel oil And the removed, particulate foreign matter remaining in the fuel oil does not pass through the pores of the outer filter material and the inner filter material, and is removed from the fuel oil. Device. According to claim 1,
It is installed inside the second filter member and is made of any one of a nonwoven fabric and a pulp material containing a super absorbent polymer to selectively absorb only the water remaining in the fuel oil that has passed through the second filter member to remove the moisture contained in the fuel oil. A multi-stage filtering device for a helicopter refueling system having a function of separating oil and water and removing foreign substances, characterized in that it further comprises a water absorbent to remove. According to claim 1,
One side is fixed to one side of the inner circumferential surface of the body, and the other end is coupled to the other end of the first filter member or the other end of the second filter member to fix the first filter member or the second filter member to the body portion. A multi-stage filtering device for a helicopter refueling system having a function of separating oil and water and removing foreign substances, characterized in that it further comprises.

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