KR20160109855A - Separate controller type automatic bilge pump for ship - Google Patents

Separate controller type automatic bilge pump for ship Download PDF

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Publication number
KR20160109855A
KR20160109855A KR1020150035020A KR20150035020A KR20160109855A KR 20160109855 A KR20160109855 A KR 20160109855A KR 1020150035020 A KR1020150035020 A KR 1020150035020A KR 20150035020 A KR20150035020 A KR 20150035020A KR 20160109855 A KR20160109855 A KR 20160109855A
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KR
South Korea
Prior art keywords
pump
controller
bilge
cable
pulley
Prior art date
Application number
KR1020150035020A
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Korean (ko)
Other versions
KR101721593B1 (en
Inventor
김만호
이석
이상협
Original Assignee
부산대학교 산학협력단
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to KR1020150035020A priority Critical patent/KR101721593B1/en
Publication of KR20160109855A publication Critical patent/KR20160109855A/en
Application granted granted Critical
Publication of KR101721593B1 publication Critical patent/KR101721593B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0686—Mechanical details of the pump control unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B13/00—Conduits for emptying or ballasting; Self-bailing equipment; Scuppers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0693—Details or arrangements of the wiring

Abstract

The present invention relates to an automatic bilge pump for a marine vessel of a separated type of a controller, in which a controller which can frequently fail in a harsh environment handling biline can be separated and replaced from a relatively durable motor pump, and a trouble- The maintenance cost can be reduced by removing the billet detection float.
According to the present invention, there is provided a pump comprising: a pump main body having a built-in motor pump, a suction port formed at a lower portion thereof for sucking a bilge therein, and a discharge port through which a bilge sucked through the suction port is formed; A controller for controlling and driving and stopping the motor pump; A filter member installed at a lower portion of the pump body and surrounding the suction port to filter solids of a predetermined size or larger included in the bilge; And a protective cap covering the upper portion of the pump main body. The controller cartridge includes the controller, and the controller cartridge is detachably mounted on the upper surface of the pump main body.

Description

Separate controller type automatic bilge pump for ship

The present invention relates to a marine bilge pump, and in particular, it is possible to separate and replace a controller which is frequently in trouble in a harsh environment handling biline from a motor pump having relatively high durability. In addition, The present invention relates to an automatic bilge pump for a marine vessel of a separated type that can reduce the maintenance cost by eliminating the float.

In general, bilge water, which is polluted water mixed with oil, is used on the bottom of the ship and bilge pumps are used to transfer them to separate storage facilities because they can seriously pollute the ocean.

Such a bilge pump is made to be of a size that can be easily moved when it is not a large-sized ship. The construction of the bilge pump includes a main body having a suction port and a discharge port for containing the motor pump and sucking the bilge, And a filter member installed to filter dirt contained in the bilge.

This small-sized bilge pump has recently been developed by the Attwood Corporation of the United States. The manual bilge pump is a type of automatic bilge pump that operates automatically when the bilge is turned on the ship. to be. In the case of an automatic bilge pump, it is configured to operate the motor pump by detecting whether or not it is bilge by float rising according to the water level.

However, in the case of a bilge pump according to the prior art, despite the basic sealing treatment, the saline concentration is high and the bilge is continuously exposed to a poor environment handling biline contaminated with various substances, so that it easily breaks down and is discarded. Particularly unfortunate is that the electronic controller is disposing the entire product including the relatively durable motor pump as the main cause of failure due to corrosion due to bilge.

Further, in the case of the conventional bilge pump, a float is installed for bilge detection, which is another cause of failure, and it is disadvantageous in that it is structurally structurally complex as it is installed inside the suction port side of the motor pump.

U.S. Published Patent Application No. 2004-0018094 (2004.01.29)

Accordingly, it is an object of the present invention to provide a motor pump that can be separated from a relatively durable motor pump, The present invention is to provide an automatic bilge pump for a marine vessel separation type.

According to an aspect of the present invention, there is provided a marine bilge pump including a motor pump, a suction port formed at a lower portion thereof for sucking a bilge, and a bilge sucked through the suction port at a side thereof, A pump body having an outlet formed therein; A controller for controlling and driving and stopping the motor pump; And a filter member installed at a lower portion of the pump body and surrounding the suction port to filter solids of a predetermined size or larger included in the bilge, wherein the controller cartridge includes the controller, And is detachably mounted on the upper surface of the pump main body.

In order to mount the controller cartridge to the pump body, a pair of guide rails is formed on the upper surface of the pump body so as to be spaced apart from each other, and the controller cartridge is mounted on a lower portion of the cartridge body And a sliding cabinet having a flat plate shape protruding from the left side and being slidably fitted to the pair of guide rails.

A plurality of first fixed pulleys connected to a first cable connected to the controller and a second cable connected to the motor pump for connection between the controller and the motor pump and fixed to the inside of the sliding cabinet; A first fixed pulley and a second fixed pulley, the first fixed pulley and the second fixed pulley being coupled to each other in a sliding cabinet, A plurality of first moving pulleys for allowing the first cable to be drawn out and for withdrawing the first cable that has been drawn away from the first fixing pulley; And a plurality of first springs elastically supporting the first moving pulley so that the first moving pulley has a tendency to move in a direction away from the first fixing pulley, and the first cable is inclined to be drawn into the sliding cabinet, When the external force is applied to the sliding cabinet, withdrawing from the inside of the sliding cabinet is allowed.

A plurality of second fixed pulleys fixed within the upper end of the pump body; A second fixed pulley which is movably provided at a position spaced apart from the second fixed pulley in an upper end portion of the pump body and supports the second cable in a staggered manner with the second fixed pulley so as to approach A plurality of second moving pulleys for allowing the second cable to be drawn out and for withdrawing the second cable that has been drawn away from the second fixing pulley; And a plurality of second springs elastically supporting the second moving pulley so that the second moving pulley has a tendency to move in a direction away from the second fixing pulley, the second cable having a tendency to be drawn into the upper end of the pump body And when the external force exceeds a predetermined level, the pump is allowed to be drawn out from the inside of the upper end of the pump body.

In addition, a USB terminal is further provided on a side surface of the cartridge body for inputting / outputting data to / from the controller, and the USB terminal protrudes from a side surface of the cartridge body when the cartridge is advanced by a sliding method.

In addition, the controller periodically operates the motor pump, and when the motor pump idles because there is no bilge, the operation of the motor pump is immediately stopped.

In addition, when the operation of the motor pump is stopped due to idling, the controller gradually increases the operation period of the motor pump to reduce energy consumption.

The automatic bilge pump for a marine vessel of the present invention can separate the controller from the motor pump having relatively high durability by replacing the controller which is often in trouble in a harsh environment where biline is handled, It is possible to use the product for a long period of time without replacing the entire product.

Further, the present invention is advantageous in that the controller does not need to have a separate device for detecting bilge, such as float, by allowing the controller to detect the bilge through current detection, and there is no need to worry about them.

In addition, according to the present invention, a USB terminal of a sliding type is installed in a controller cartridge, thereby facilitating firmware upgrade and data input / output of the controller.

In addition, the present invention allows the cables connecting the controller and the motor pump to be withdrawn only when necessary, wherein the cables can be expanded or contracted by a pulley structure, whereby a plurality of pulleys constituting a pulley structure in a harsh environment, , There is an advantage in that even if some of the springs are damaged, they can be operated independently.

1 is a perspective view of a marine bilge pump according to an embodiment of the present invention;
FIG. 2 is a perspective view of an assembly diagram for explaining a configuration of a marine bilge pump according to an embodiment of the present invention.
3 is a perspective view of a controller cartridge in a marine bilge pump according to an embodiment of the present invention.
FIGS. 4A to 4C are a series of views for explaining a mounting process of a controller cartridge by sliding in a marine bilge pump according to an embodiment of the present invention. FIG.
5a to 5c are a series of views for explaining a pulley structure of a first cable connected to a controller in a marine bilge pump according to an embodiment of the present invention;
6 is a view for explaining a pulley structure of a second cable connected to a motor pump in a marine bilge pump according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are enlarged to illustrate the present invention, and are actually shown in a smaller scale than the actual dimensions in order to understand the schematic structure.

Also, the terms first and second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. On the other hand, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

FIG. 1 is a perspective view of a marine bilge pump according to an embodiment of the present invention. FIG. 2 is an assembled view for explaining the configuration of a marine bilge pump according to an embodiment of the present invention. 4a to 4c are a series of reference views for explaining a mounting process of a controller cartridge in a marine bilge pump according to an embodiment of the present invention by sliding the controller cartridge in a marine bilge pump.

As shown in the drawing, the marine bilge pump according to an embodiment of the present invention is a portable bilge pump that is portable and easy to move, and includes a pump body 110, a controller cartridge 120 having a built-in PCB including a controller, (130) and a protective cap (140). The controller cartridge (120) is easily detachable from the pump body (110) and is replaceable. When the controller fails, the controller cartridge It is possible to use for a long time by replacing only that part.

Hereinafter, a marine bilge pump according to an embodiment of the present invention will be described in detail with reference to the above components.

The pump main body 110 includes a motor pump, and a suction port 111a for sucking the bilge is formed in the lower portion. A discharge port 111b for discharging the bilge sucked through the suction port 111a is formed in the side surface . In addition, a pair of guide rails 112 are formed on the upper surface of the pump body 110 so as to be spaced apart from each other for mounting the controller cartridge 120. The guide rail 112 may be made of a synthetic resin rather than a rigid metallic material and is preferably formed integrally with the casing 111 of the pump body 110. When the pair of guide rails 112 are provided, a sliding cabinet 120b formed in a flat plate shape below the controller cartridge 120 can be inserted and fixed along the guide rails 112 in a sliding manner.

The controller cartridge 120 incorporates a PCB including a controller to protect the controller and detachably mount the controller on the upper surface of the pump body 110. The controller cartridge 120 includes a cartridge body 120a having the controller built therein and a pair of guide rails 112 protruding from the left side of the cartridge body 120a in the lower portion of the cartridge body 120a, And a sliding cabinet 120b having a flat plate shape. 4A to 4C show sequential views in which the controller cartridge 120 is mounted on the upper surface of the pump body 110 in a sliding manner. The first cable 121 connected to the controller and the second cable 114 connected to the motor pump for electrical connection between the controller and the motor pump in the process of mounting the controller cartridge 120 are connected to each other, The first cable 121 and the second cable 114 can be drawn out by applying an external force only when the first cable 121 and the second cable 114 are needed for convenience of the time, Such a configuration will be described later in detail.

Meanwhile, a USB terminal 125 is provided on the main cartridge body unit 120a of the controller cartridge 120. [ The USB terminal 125 is inserted into a USB port provided in a PC or the like to facilitate firmware upgrade and data input / output with respect to the built-in controller. The USB terminal 125 is installed on the side surface of the main cartridge body unit 120a in a sliding manner and protrudes from the side surface of the main cartridge body unit 120a at the time of advancement, Lt; / RTI > A slot 127 is formed on the upper surface of the main cartridge body unit 120a so as to move the USB terminal 125 in the longitudinal direction of the USB terminal 125, Is projected upward. The user can advance / retreat the USB terminal 125 by touching the switching projection 126 with a finger.

Further, the controller included in the controller cartridge 120 periodically controls the motor pump to stop the operation of the motor pump immediately when the motor pump idles because there is no bilge. According to such a configuration, it is possible to determine whether or not bilge is accumulated in the hull without additional devices such as a float sensor having many troubles, and to operate the motor pump efficiently only when necessary.

In the control method of the controller, the controller can determine whether the motor pump is idling by the fine voltage determined by the consumed current of the motor pump. If it is determined that the motor pump is idling, . Further, when the operation of the motor pump is stopped due to idling, the controller gradually increases the operation period of the motor pump to reduce the number of operations during the reference time, thereby reducing energy consumption.

The filter member 130 serves to filter the solids of a certain size or more included in the bilge. For this, the filter member 130 is installed in the lower part of the pump body 110 to surround the suction port 111a. An inflow gap (131) is formed at the lower end of the filter member (130) so as to allow the rest of the bilge to pass therethrough except for a solid having a predetermined size or more.

The protective cap 140 protects the controller cartridge 120 mounted on the upper portion of the pump body 110 as a cylindrical container with an open bottom.

5a to 5c are a series of reference views illustrating a pulley structure of a first cable connected to a controller in a marine bilge pump according to an embodiment of the present invention, Fig. 2 is a view for explaining a pulley structure of a second cable connected to a motor pump.

As described above, the marine bilge pump according to the embodiment of the present invention includes a first cable 121 connected to the controller for electrical connection between the controller and the motor pump in the process of mounting the controller cartridge 120, The second cable 114 is connected to the first cable 121 and the second cable 114 so that the first cable 121 and the second cable 114 can be drawn out by applying an external force only when the first cable 121 and the second cable 114 are needed for convenience of connection, .

5A to 5C, in order to allow the first cable 121 to be drawn out, a first fixed pulley 122a and a second fixed pulley 122b are provided in the sliding cabinet 120b of the controller cartridge 120, A pulley 115b, and a first spring 123 are provided. The first fixed pulley 122a is fixedly installed inside the sliding cabinet 120b. The first moving pulley 122b is installed movably in a position spaced apart from the first fixing pulley 122a in the sliding cabinet 120b and is movable along with the first fixing pulley 122a, The cable 121 is supported in a staggered manner so as to allow the first cable 121 to be drawn out when it approaches the first fixing pulley 122a and to be pulled out when it is moved away from the first fixing pulley 122a So that the first cable 121 can be recovered. The first spring 123 elastically supports the first moving pulley 122b so as to have a tendency to move in a direction away from the first fixing pulley 122a.

According to such a pulley structure, as shown in FIG. 5A through FIG. 5B, when the first cable 121 tends to be drawn into the sliding cabinet 120b, And is withdrawn from the inside of the sliding cabinet 120b. A first connection terminal 124 is provided at an end of the first cable 121 for connection with the second cable 114.

6, a second fixed pulley 115a and a second movable pulley 115b are provided in the upper end portion 111c of the pump main body 110 to allow the second cable 114 to be drawn out, And a second spring 116 are installed. The second fixed pulley 115a is fixedly installed in the upper end portion 111c of the pump main body 110. The second moving pulley 115b is installed movably in a position spaced apart from the second fixing pulley 115a in the upper end 111c of the pump main body 110 and the second fixing pulley 115a, And the second cable 114 is connected to the second fixing pulley 115a in a zigzag manner so that the second cable 114 can be drawn out when the second cable 114 approaches the second fixing pulley 115a, So that the second cable 114 that has been drawn out can be recovered. And the second spring 116 elastically supports the second moving pulley 115b so as to have a tendency to move in a direction away from the second fixed pulley 115a.

According to such a pulley structure, the second cable 114 tends to be drawn into the upper end portion 111c of the pump main body 110 as in the case of the first cable 121, Is allowed to be drawn out from the inside of the upper end portion 111c of the casing 110 through the through hole 111d. For reference, a second connection terminal 113 is provided at an end of the second cable 114 for connection with the first cable 121.

In the case of the above-mentioned pulley structure, there is a somewhat more complicated surface considering only the structure for pulling in and out the first cable 121 and the second cable 114. However, a large width in the vertical direction is not required in terms of the installation space, Even if one of the pulleys and the springs of the pulleys is disengaged or damaged, there is an advantage that the durability can be relied on to the extent that there is no problem in terms of the entire function. This highly reliable configuration is suitable for harsh environments handling bilge.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is clear that the present invention can be suitably modified and applied in the same manner. Therefore, the above description does not limit the scope of the present invention, which is defined by the limitations of the following claims.

110: pump main body 111a:
111b: outlet 112: guide rail
115a: second fixed pulley 115b: second moving pulley
116: second spring 120: controller cartridge
120a: Cartridge main body 120b: Sliding cabinet
122a: first fixed pulley 122b: first moving pulley
123: First spring 125: USB jack
130: filter member 140: protective cap

Claims (9)

A bilge pump for a ship for sucking and transporting bilge accumulated in a hull,
A pump main body having a built-in motor pump, a suction port for sucking the bilge, and a discharge port for discharging the bilge sucked through the suction port;
A controller for controlling and driving and stopping the motor pump;
A filter member installed at a lower portion of the pump body and surrounding the suction port to filter solids of a predetermined size or larger included in the bilge;
And a protective cap covering the upper portion of the pump body,
Wherein the controller cartridge is provided with the controller, and the controller cartridge is detachably mounted on the upper surface of the pump body. The method according to claim 1,
A pair of guide rails formed on the upper surface of the pump body so as to be spaced apart from each other and facing each other to mount the controller cartridge on the pump body; And a sliding cabinet having a flat plate shape protruding from the bottom of the sliding guide rail and being slidably fitted in the pair of guide rails. 3. The method of claim 2,
A first cable connected to the controller and a second cable connected to the motor pump are connected to each other for electrical connection between the controller and the motor pump,
A plurality of first fixed pulleys fixed within the sliding cabinet;
A first fixed pulley and a second fixed pulley, the first fixed pulley and the second fixed pulley being coupled to each other in a sliding cabinet, A plurality of first moving pulleys for allowing the first cable to be drawn out and for withdrawing the first cable that has been drawn away from the first fixing pulley;
Further comprising a plurality of first springs elastically supporting the first moving pulley so as to have a tendency to move in a direction away from the first fixing pulley,
Wherein the first cable has a tendency to be drawn into the sliding cabinet and is allowed to be drawn out from the inside of the sliding cabinet when an external force equal to or greater than a predetermined value is applied thereto. The method of claim 3,
A plurality of second fixed pulleys fixed within the upper end of the pump body;
A second fixed pulley which is movably provided at a position spaced apart from the second fixed pulley in an upper end portion of the pump body and supports the second cable in a staggered manner with the second fixed pulley so as to approach A plurality of second moving pulleys for allowing the second cable to be drawn out and for withdrawing the second cable that has been drawn away from the second fixing pulley;
Further comprising a plurality of second springs for elastically supporting the second moving pulley so as to have a tendency to move in a direction away from the second fixing pulley,
Wherein the second cable has a tendency to be drawn into the upper end of the pump body and is allowed to be drawn out from the upper end of the pump body when an external force equal to or greater than a certain level is applied. 3. The method of claim 2,
Wherein a USB terminal is further provided on a side surface of the cartridge body for firmware upgrade and data input / output to the controller. 6. The method of claim 5,
Wherein the USB terminal is protruded from the side surface of the main cartridge body when advancing by a sliding method, and is retracted into the side surface of the main cartridge body when retracted to conceal the main body. The method according to claim 1,
Wherein the controller periodically operates the motor pump and immediately stops operation of the motor pump when the motor pump idles due to no bilge. 8. The method of claim 7,
Wherein the controller gradually increases the operation period of the motor pump to reduce energy consumption when the operation of the motor pump is interrupted due to idling. A bilge pump for a ship for sucking and transporting bilge accumulated in a hull,
A pump main body having a built-in motor pump, a suction port for sucking the bilge, and a discharge port for discharging the bilge sucked through the suction port;
A controller for controlling and driving and stopping the motor pump;
A filter member installed at a lower portion of the pump body and surrounding the suction port to filter solids of a predetermined size or larger included in the bilge;
And a protective cap covering the upper portion of the pump body,
Wherein the controller cartridge includes a pair of guide rails formed on the upper surface of the pump body so as to be detachable from the upper surface of the pump body, the guide rails being spaced apart from each other and facing each other, And a sliding cabinet having a flat plate shape protruding leftward from the lower portion of the main body of the cartridge having the controller built therein and being slidably fitted in the pair of guide rails,
A plurality of first fixed pulleys connected to a first cable connected to the controller and a second cable connected to the motor pump for connection between the controller and the motor pump and fixed to the inside of the sliding cabinet; A first fixed pulley and a second fixed pulley, the first fixed pulley and the second fixed pulley being coupled to each other in a sliding cabinet, A plurality of first moving pulleys for allowing the first cable to be drawn out and for withdrawing the first cable that has been drawn away from the first fixing pulley; And a plurality of first springs elastically supporting the first moving pulley so that the first moving pulley has a tendency to move in a direction away from the first fixing pulley, and the first cable is inclined to be drawn into the sliding cabinet, The sliding cabinet can be pulled out from the inside of the sliding cabinet,
The USB terminal is further provided with a USB terminal for inputting and outputting data to and from the controller. The USB terminal is protruded from the side surface of the cartridge body when advancing by a sliding method, To be concealed,
Wherein the controller periodically operates the motor pump to immediately stop the operation of the motor pump when the motor pump idles because there is no bilge and to stop the operation of the motor pump due to idling, And the energy consumption is reduced by increasing the cycle gradually.
KR1020150035020A 2015-03-13 2015-03-13 Separate controller type automatic bilge pump for ship KR101721593B1 (en)

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Application Number Priority Date Filing Date Title
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KR101721593B1 KR101721593B1 (en) 2017-03-30

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040018094A (en) 2002-08-21 2004-03-02 혼하이 프리시젼 인더스트리 컴퍼니 리미티드 Rf front-end of dual-mode wireless transceiver
US20040191090A1 (en) * 2001-11-12 2004-09-30 Shurflo Pump Manufacturing Company, Inc. Bilge pump
KR100950825B1 (en) * 2008-09-26 2010-04-02 공인익 Action condition testing device for sludge discharge pump
KR20100119429A (en) * 2009-04-30 2010-11-09 동서대학교산학협력단 Usb memory apparatus
KR101310918B1 (en) * 2011-12-05 2013-09-25 권태규 Floating body module for docking facilities and docking facilities with the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040191090A1 (en) * 2001-11-12 2004-09-30 Shurflo Pump Manufacturing Company, Inc. Bilge pump
KR20040018094A (en) 2002-08-21 2004-03-02 혼하이 프리시젼 인더스트리 컴퍼니 리미티드 Rf front-end of dual-mode wireless transceiver
KR100950825B1 (en) * 2008-09-26 2010-04-02 공인익 Action condition testing device for sludge discharge pump
KR20100119429A (en) * 2009-04-30 2010-11-09 동서대학교산학협력단 Usb memory apparatus
KR101310918B1 (en) * 2011-12-05 2013-09-25 권태규 Floating body module for docking facilities and docking facilities with the same

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