KR20230050033A - The impella rotary shaft cooling device of the water pump - Google Patents

The impella rotary shaft cooling device of the water pump Download PDF

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Publication number
KR20230050033A
KR20230050033A KR1020210133252A KR20210133252A KR20230050033A KR 20230050033 A KR20230050033 A KR 20230050033A KR 1020210133252 A KR1020210133252 A KR 1020210133252A KR 20210133252 A KR20210133252 A KR 20210133252A KR 20230050033 A KR20230050033 A KR 20230050033A
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South Korea
Prior art keywords
water pump
rotating shaft
chamber
impeller
water
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KR1020210133252A
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Korean (ko)
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KR102576224B1 (en
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김동수
김용운
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김동수
김용운
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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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/043—Shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2210/00—Working fluids
    • F05D2210/10—Kind or type
    • F05D2210/11—Kind or type liquid, i.e. incompressible

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The present invention relates to an impeller rotary shaft cooling device of a water pump. More specifically, a cooling device is attached to an outer surface of an impeller rotary shaft supported by a shaft grip to be rotated by an electric device to allow water of a water pump to circulate, thereby preventing the impeller rotary shaft from being overheated despite long-term rotation to prevent lubrication oil from being leaked from the shaft grip.

Description

양수기의 임펠라 회전축 냉각장치{The impella rotary shaft cooling device of the water pump}The impella rotary shaft cooling device of the water pump}

본 발명은 양수기의 임펠라 회전축 냉각장치에 관한 것으로 보다 구체적인 것은, 축잡이에 지지되어 전동장치로 회전하는 임펠라 회전축 외면에 냉각장치를 부착하여 양수기의 물이 순환되게 함으로써, 임펠라 회전축을 장시간 회전시켜도 과열되는 일이 없도록 하여 축잡이에서 윤활유가 누출되지 않게 한 것이다.The present invention relates to a cooling device for an impeller rotating shaft of a water pump, and more specifically, by attaching a cooling device to the outer surface of an impeller rotating shaft supported by a shaft holder and rotating by a transmission device to circulate water in the water pump, overheating even when the rotating shaft of the impeller is rotated for a long time. This is to prevent leakage of lubricating oil from the shaft holder.

종래의 양수기 임펠라 회전축은 축잡이에 장치되어 축잡이와 베어링으로 지지되고, 축잡이 중앙부에 급유공간이 형성되어 주유기를 통해 급유공간으로 윤활유를 공급하고 있다.The conventional water pump impeller rotation shaft is installed on a shaft holder and supported by the shaft holder and a bearing, and an oil supply space is formed in the center of the shaft holder to supply lubricant to the oil supply space through a lubricator.

따라서 임펠라 회전축을 장시간 회전시키면 과열되어 축잡이에 형성된 급유공간에 공급된 윤활유가 열을 받아 팽창하게 되므로, 베어링부와 리테너부를 통해 누출되기 때문에 주변이 오염되고 윤활유가 낭비되는 불편이 있다.Therefore, when the impeller rotating shaft is rotated for a long time, it is overheated and the lubricating oil supplied to the oil supply space formed in the shaft holder receives heat and expands, so that the surroundings are contaminated and the lubricating oil is wasted because it leaks through the bearing part and the retainer part.

따라서 이를 방지하기 위해 회전축 축잡이에 수조를 형성하여 양수실의 물이 연통되게 한 것이 있으나 이는 축잡이에 연통하는 물의 순환이 느려서 냉각효과가 떨어지는 불편이 있고, 장치가 복잡하여 제작비용이 많이 드는 불편이 있었다.Therefore, in order to prevent this, a water tank is formed on the shaft holder to allow the water in the pumping chamber to communicate. There was an inconvenience.

선행기술 실용신안등록 제20-0316246호Prior art utility model registration No. 20-0316246

본 발명은 상기 불편을 해소하기 위하여 개발된 것이다.The present invention was developed to solve the above inconvenience.

본 발명은 양수기 본체(1a) 내부에 형성한 흡수실(2)에 임펠라수용실(2a)을 형성하여 임펠라(3)를 장치하고, 임펠라수용실(2a) 외주에 흡수실과 구확되어 흡수한 물을 배출구(4a)로 배출하는 배출실(4)을 형성하며, 흡수구(2b)와 반대되는 쪽에 임펠라(3) 회전축(3a)을 지지하는 축잡이(5)를 부착하여 축잡이에 윤활유를 공급하는 주유기(5a)를 형성하고, 축잡이와 회전축 사이에 베어링(B1)(B2)을 장치하며, 임펠라와 회전축이 접속되는 위치에 매카니컬실(6)과 리테너(7)를 장치하고, 회전축 외측단에 회전풀리(8)를 장치하는 전동식 양수기(1)에 있어서, In the present invention, the impeller accommodating chamber 2a is formed in the absorption chamber 2 formed inside the water pump body 1a, the impeller 3 is installed, and the water absorbed by being sealed with the absorption chamber on the outer circumference of the impeller accommodating chamber 2a It forms a discharge chamber (4) for discharging to the discharge port (4a), and attaches a shaft holder (5) that supports the rotation shaft (3a) of the impeller (3) to the side opposite to the absorption hole (2b) to supply lubricant to the shaft holder A lubricator (5a) is formed, bearings (B1) (B2) are installed between the shaft holder and the rotating shaft, and a mechanical seal (6) and a retainer (7) are installed at a position where the impeller and the rotating shaft are connected, In the electric water pump (1) equipped with a rotary pulley (8) at the outer end of the rotating shaft,

축잡이(5) 외측지지부에서 회전풀리(8) 쪽으로 돌출되는 회전축(3a) 외주에 냉각관체(9)를 장치하여 내부에 냉각수수용실(9a)을 형성하고 냉각수수용실(9a)의 입구(9b)와, 배출구(9c)를 양수기의 흡수실(2)의 흡수부와 배출실(4)의 배출부에 통수관(9b')(9c')으로 연결하여 양수기의 물이 냉각수수용실로 강제 순환되게 하고, 냉각관체(9)와 회전축(3a)의 접속부에 리테너(7a)를 장치하여서 되는 구성이다.The cooling tube body 9 is installed on the outer circumference of the rotating shaft 3a protruding toward the rotating pulley 8 from the outer support of the shaft holder 5 to form a cooling water receiving chamber 9a inside, and the entrance of the cooling water receiving chamber 9a ( 9b) and the discharge port 9c are connected to the absorption part of the absorption chamber 2 and the discharge part of the discharge chamber 4 of the water pump through water pipes 9b' and 9c', so that the water of the water pump is forced into the cooling water receiving chamber. It is configured to be circulated, and a retainer 7a is installed at the connection portion between the cooling tube body 9 and the rotating shaft 3a.

상기에서 냉각관체(9)는 냉각수수용실(9a)을 형성하기 위해 냉각관체본체(9')에 덮개(9")가 구비되고, 냉각관체 본체 외주에 체결구멍(9"')을 형성하여 회전축(3a)에 냉각관체를 끼우고, 축잡이(5) 외측면에 냉각본체 본체와 덮개를 볼트(5b)로 체결하여 고정시키며, 통수관(9b')(9c')은 양단부에 연결나사부(9d)(9e)를 형성하여 흡수실(2)과 배수실(4)의 주벽에 천공한 나사구멍(2')(4')에 결합하고, 일측에 개폐밸브(9d')를 갖추어서 되는 구성이다.In the above cooling tube body 9, a cover 9" is provided on the cooling tube body 9' to form a cooling water receiving chamber 9a, and a fastening hole 9"' is formed on the outer circumference of the cooling tube body The cooling tube body is inserted into the rotating shaft (3a), and the cooling body body and the cover are fastened to the outer surface of the shaft holder (5) by fastening with bolts (5b), and the water passing pipes (9b') (9c') have connecting screws at both ends. (9d) (9e) is formed to combine with the screw holes (2') (4') drilled in the peripheral walls of the absorption chamber (2) and the drainage chamber (4), and equipped with an on-off valve (9d') on one side It is a composition that becomes

이와 같이 된 본 발명은 축잡이(5) 외측지지부로 돌출된 임펠라 회전축(3a)의 외측단에 회전풀리(8)가 부착되고, 회전풀리와 축잡이 사이에 위치하는 회전축 외면에 냉각관체(9)가 장치되는데 벨트로 연결하여 회전돌출 회전시킴으로써, 양수기가 작동하게 되는데 양수기가 작동하게 되고, 양수기가 작동하게 되면, 흡입실(2)의 흡수구(2b)와 배출실(4)의 배출부에 연결한 통수관(9b')(9c')을 통해 회전축(3a) 외면에 피복한 냉각관체(9)의 냉각수수용실(9a)에 양수기의 물이 강제 순환되므로 냉각관체에 의하여 회전축이 냉각되므로, 회전축(3a)이 과열되지 않아 축잡이(5)에 주입한 윤활유가 과열되지 않으므로, 안정적인 작용을 할 수 있고, 이로인해 윤활유가 팽창하여 누출되는 현상을 예방할 수 있기 때문에 윤활유의 낭비를 막을 수 있고, 베어링과 리테너의 마모를 방지하여 양수기 작동을 안정적으로 유지할 수 있는 이점을 얻을 수 있게 되고, 통수관(9b')(9c')은 연결나사부를 흡수실의 주벽과 배수실의 주벽에 천공한 나사구멍(2')(4')에 결합하고, 일측에 개폐밸브(9d')가 있어서 냉각수의 연결이 편리하고, 필요시에 냉각수의 공급을 중지시킬 수 있어 관리가 편리한 이점이 있다.In this way, the present invention has a rotation pulley 8 attached to the outer end of the impeller rotation shaft 3a protruding to the outer support of the shaft holder 5, and a cooling tube body 9 on the outer surface of the rotation shaft located between the rotation pulley and the shaft holder. ) is installed, and by connecting it with a belt and rotating it, the water pump operates. When the water pump operates, the suction port 2b of the suction chamber 2 and the discharge part of the discharge chamber 4 Since the water from the water pump is forcibly circulated through the connected water pipes 9b' and 9c' to the cooling water receiving chamber 9a of the cooling tube 9 coated on the outer surface of the rotation shaft 3a, the rotation shaft is cooled by the cooling tube body. , Since the rotating shaft (3a) is not overheated and the lubricating oil injected into the shaft holder (5) is not overheated, stable operation can be performed, and the phenomenon of expansion and leakage of lubricating oil can be prevented, thereby preventing waste of lubricating oil. In addition, it is possible to obtain the advantage of stably maintaining the operation of the water pump by preventing wear of the bearing and retainer, and the water passage pipe (9b') (9c') has a connecting screw portion attached to the peripheral wall of the absorption chamber and the peripheral wall of the drainage chamber. It is coupled to the drilled screw holes 2' and 4', and there is an on-off valve 9d' on one side, so the connection of cooling water is convenient, and the supply of cooling water can be stopped when necessary, so management is convenient. .

도 1은 본 발명의 전체적인 사시도
도 2는 도 1의 일부파절 단면도
도 3은 본 발명의 요부 확대 단면도
도 4는 도 3의 가-가'선단면도
도 5는 본 발명의 연결관 예시도이다.1 is an overall perspective view of the present invention
Figure 2 is a partially broken cross-sectional view of Figure 1
Figure 3 is an enlarged cross-sectional view of the main part of the present invention
Figure 4 is a cross-sectional view of Figure 3 'Ga-Ga'
5 is an exemplary view of the connector of the present invention.

본 발명은 양수기 본체(1a) 내부에 형성한 흡수실(2)에 임펠라수용실(2a)을 형성하여 임펠라(3)를 장치하고, 임펠라수용실(2a) 외주에 흡수실과 구확되어 흡수한 물을 배출구(4a)로 배출하는 배출실(4)을 형성하며, 흡수구(2b)와 반대되는 쪽에 임펠라(3) 회전축(3a)을 지지하는 축잡이(5)를 부착하여 축잡이에 윤활유를 공급하는 주유기(5a)를 형성하고, 축잡이와 회전축 사이에 베어링(B1)(B2)을 장치하며, 임펠라와 회전축이 접속되는 위치에 매카니컬실(6)과 리테너(7)를 장치하고, 회전축 외측단에 회전풀리(8)를 장치하는 전동식 양수기(1)에 있어서, In the present invention, the impeller accommodating chamber 2a is formed in the absorption chamber 2 formed inside the water pump body 1a, the impeller 3 is installed, and the water absorbed by being sealed with the absorption chamber on the outer circumference of the impeller accommodating chamber 2a It forms a discharge chamber (4) for discharging to the discharge port (4a), and attaches a shaft holder (5) that supports the rotation shaft (3a) of the impeller (3) to the side opposite to the absorption hole (2b) to supply lubricant to the shaft holder A lubricator (5a) is formed, bearings (B1) (B2) are installed between the shaft holder and the rotating shaft, and a mechanical seal (6) and a retainer (7) are installed at a position where the impeller and the rotating shaft are connected, In the electric water pump (1) equipped with a rotary pulley (8) at the outer end of the rotating shaft,

축잡이(5) 외측지지부에서 회전풀리(8) 쪽으로 돌출되는 회전축(3a) 외주에 냉각관체(9)를 장치하여 내부에 냉각수수용실(9a)을 형성하고 냉각수수용실(9a)의 입구(9b)와, 배출구(9c)를 양수기의 흡수실(2)의 흡수부와 배출실(4)의 배출부에 통수관(9b')(9c')으로 연결하여 양수기의 물이 냉각수수용실로 강제 순환되게 하고, 냉각관체(9)와 회전축(3a)의 접속부에 리테너(7a)를 장치하여서 되는 구성이다.The cooling tube body 9 is installed on the outer circumference of the rotating shaft 3a protruding toward the rotating pulley 8 from the outer support of the shaft holder 5 to form a cooling water receiving chamber 9a inside, and the entrance of the cooling water receiving chamber 9a ( 9b) and the discharge port 9c are connected to the absorption part of the absorption chamber 2 and the discharge part of the discharge chamber 4 of the water pump through water pipes 9b' and 9c', so that the water of the water pump is forced into the cooling water receiving chamber. It is configured to be circulated, and a retainer 7a is installed at the connection portion between the cooling tube body 9 and the rotating shaft 3a.

상기에서 냉각관체(9) 냉각수수용실(9a)을 형성하기 위해 냉각관체본체(9')에 덮개(9")가 구비되고, 냉각관체본체 외주에 체결구멍(9"')을 형성하여 회전축(3a)에 냉각관체를 끼우고, 축잡이(5) 외측면에 냉각관체본체와 덮개를 볼트(5b)로 체결하여 고정시키는 구성이며, 통수관(9b')(9c')은 양단부에 연결나사부(9d)(9e)를 형성하여 흡수실(2)과 배출실(4)의 주벽에 천공한 나사구멍(2')(4')에 나사결합하고, 일측에 개폐밸브(9d')를 갖추어서 되는 구성이다.In order to form the cooling water receiving chamber 9a of the cooling tube body 9 above, a cover 9" is provided on the cooling tube body 9', and a fastening hole 9"' is formed on the outer circumference of the cooling tube body to form a rotating shaft. The cooling tube body is inserted into (3a), and the cooling tube body and cover are fastened to the outer surface of the shaft holder (5) with bolts (5b) to fix it, and the water pipes (9b') (9c') are connected to both ends. Threaded portions 9d and 9e are formed and screwed into the screw holes 2' and 4' drilled in the circumferential walls of the absorption chamber 2 and the discharge chamber 4, and an on-off valve 9d' is installed on one side. It is a configuration that is equipped.

1 : 양수기 1a : 양수기 본체
2 : 흡수실 2' : 나사구멍
2a : 임펠라수용실 2b : 흡수구 3 : 임펠라 3a : 임펠라회전축
4 : 배출실 4' : 나사구멍
4a : 배출구 5 : 축잡이
5a : 주유기 5b : 볼트
6 : 매카니컬실 7 : 리테너
7a : 리테너 8 : 회전풀리
9 : 냉각관체 9' : 냉각관체본체
9" : 덮개 9"' : 체결구멍
9a : 냉각수수용실 9b : 입구
9b',9c' : 통수관 9c : 배출구
9d,9e : 연결나사부 9d' : 개폐밸브1: water pump 1a: water pump body
2: absorption chamber 2': screw hole
2a: impeller receiving chamber 2b: absorber 3: impeller 3a: impeller shaft
4: discharge chamber 4': screw hole
4a: outlet 5: shaft holder
5a: lubricator 5b: bolt
6: mechanical thread 7: retainer
7a: retainer 8: rotary pulley
9: cooling tube body 9': cooling tube body
9": cover 9"': fastening hole
9a: cooling water receiving chamber 9b: entrance
9b', 9c': water pipe 9c: outlet
9d, 9e: connection screw part 9d': on-off valve

Claims (3)

양수기 본체(1a) 내부에 형성한 흡수실(2)에 임펠라수용실(2a)을 형성하여 임펠라(3)를 장치하고, 임펠라수용실 외주에 흡수실과 구확되어 흡수한 물을 배출구(4a)로 배출하는 배출실(4)을 형성하며, 흡수구(2b)와 반대되는 쪽에 임펠라(3) 회전축(3a)을 지지하는 축잡이(5)를 부착하여 축잡이에 윤활유를 공급하는 주유기(5a)를 형성하고, 축잡이와 회전축 사이에 베어링(B1)(B2)을 장치하며, 임펠라와 회전축이 접속되는 위치에 매카니컬실(6)과 리테너(7)를 장치하고, 회전축 외측단에 회전풀리(8)를 장치하는 전동식 양수기(1)에 있어서,
축잡이(5) 외측지지부에서 회전풀리(8) 쪽으로 돌출되는 회전축(3a) 외주에 냉각관체(9)를 장치하여 내부에 냉각수수용실(9a)을 형성하고 냉각수수용실(9a)의 입구(9b)와, 배출구(9c)를 양수기의 흡수실(2)의 흡수부와 배출실(4)의 배출부에 통수관(9b')(9c')으로 연결하여 양수기의 물이 냉각수수용실로 강제 순환되게 하고, 냉각관체(9)와 회전축(3a)의 접속부에 리테너(7a)를 장치하여서 되는 양수기의 임펠라 회전축 냉각장치.
An impeller accommodating chamber (2a) is formed in the absorption chamber (2) formed inside the water pump body (1a), the impeller (3) is installed, and the absorbed water is discharged through the discharge port (4a). It forms a discharge chamber 4 for discharging, and attaches a shaft holder 5 that supports the rotation shaft 3a of the impeller 3 on the side opposite to the absorption port 2b to supply lubricant to the shaft holder. forming, and installing bearings (B1) (B2) between the shaft holder and the rotating shaft, installing a mechanical seal (6) and a retainer (7) at the position where the impeller and the rotating shaft are connected, and a rotating pulley at the outer end of the rotating shaft In the electric water pump (1) equipped with (8),
The cooling tube body 9 is installed on the outer circumference of the rotating shaft 3a protruding toward the rotating pulley 8 from the outer support of the shaft holder 5 to form a cooling water receiving chamber 9a inside, and the entrance of the cooling water receiving chamber 9a ( 9b) and the discharge port 9c are connected to the absorption part of the absorption chamber 2 and the discharge part of the discharge chamber 4 of the water pump through water pipes 9b' and 9c', so that the water of the water pump is forced into the cooling water receiving chamber. An impeller rotating shaft cooling device of a water pump that is circulated and a retainer (7a) is installed at the connection portion between the cooling tube body (9) and the rotating shaft (3a).
 청구항 1에서,
냉각관체(9)는 냉각관체본체(9') 냉각수수용실(9a)을 형성하여 덮개(9")를 피복하고, 냉각관체본체 외주에 체결구멍(9"')을 형성하여 회전축(3a)에 냉각관체를 끼우고, 축잡이(5) 외측면에 냉각관체본체와 덮개를 볼트(5b)로 체결하여 고정시키는 양수기의 임펠라 회전축 냉각장치.
In claim 1,
The cooling tube body 9 forms a cooling water receiving chamber 9a of the cooling tube body 9' to cover the cover 9", and forms a fastening hole 9"' on the outer circumference of the cooling tube body to form a rotating shaft 3a. A water pump impeller rotating shaft cooling device in which the cooling tube body is inserted into the shaft holder (5) and the cooling tube body and the cover are fixed by fastening with bolts (5b) on the outer surface of the shaft holder (5).
 청구항 1에서,
통수관(9b')(9c')은 양단부에 연결나사부(9d)(9e)를 형성하여 흡수실(2)과 배출실(4)의 주벽에 천공한 나사구멍(2')(4')에 나사결합하고, 일측에 개폐밸브(9d')를 갖추어서 되는 양수기의 임펠라 회전축 냉각장치.


In claim 1,
The water passing pipes 9b' and 9c' have screw holes 2' and 4' drilled in the circumferential walls of the absorption chamber 2 and the discharge chamber 4 by forming connecting screw portions 9d and 9e at both ends. The impeller rotating shaft cooling device of the water pump is screwed to and equipped with an on-off valve (9d') on one side.
KR1020210133252A 2021-10-07 2021-10-07 The impella rotary shaft cooling device of the water pump KR102576224B1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200316246Y1 (en) 2003-03-10 2003-06-12 시종욱 The cooling device operate-shaft of water pump
KR200383655Y1 (en) * 2005-02-26 2005-05-06 시종욱 large water meter
KR200433323Y1 (en) * 2006-09-25 2006-12-08 주식회사 신한알앤디 A waterproof-type motor pump for self-cooling
KR100973833B1 (en) * 2010-04-14 2010-08-03 (주)대한중전기 Double suction pump
JP2012072702A (en) * 2010-09-28 2012-04-12 Honda Motor Co Ltd Centrifugal pump unit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200316246Y1 (en) 2003-03-10 2003-06-12 시종욱 The cooling device operate-shaft of water pump
KR200383655Y1 (en) * 2005-02-26 2005-05-06 시종욱 large water meter
KR200433323Y1 (en) * 2006-09-25 2006-12-08 주식회사 신한알앤디 A waterproof-type motor pump for self-cooling
KR100973833B1 (en) * 2010-04-14 2010-08-03 (주)대한중전기 Double suction pump
JP2012072702A (en) * 2010-09-28 2012-04-12 Honda Motor Co Ltd Centrifugal pump unit

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