KR890006992Y1 - System for cooling - Google Patents
System for cooling Download PDFInfo
- Publication number
- KR890006992Y1 KR890006992Y1 KR2019840011508U KR840011508U KR890006992Y1 KR 890006992 Y1 KR890006992 Y1 KR 890006992Y1 KR 2019840011508 U KR2019840011508 U KR 2019840011508U KR 840011508 U KR840011508 U KR 840011508U KR 890006992 Y1 KR890006992 Y1 KR 890006992Y1
- Authority
- KR
- South Korea
- Prior art keywords
- helium
- air
- frame
- cooling
- rotary electric
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/08—Arrangements for cooling or ventilating by gaseous cooling medium circulating wholly within the machine casing
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/10—Arrangements for cooling or ventilating by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
내용 없음.No content.
Description
제1도는 종래의 회전전기기계의 통풍구조도.1 is a ventilation structure diagram of a conventional rotary electric machine.
제2도는 본 고안의 한실시예에 의한 회전전기기계의 통풍구조도.2 is a ventilation structure diagram of a rotary electric machine according to one embodiment of the present invention.
제3도는 헬륨용적비와 공기에 대한 비중비.3 is the ratio of helium volume to specific air.
제4도는 헬륨용적비와 공기에 대한 열전도율비.4 is the ratio of helium volume and thermal conductivity to air.
제5도는 헬륨용적비와 공기에 대한 동점성(動點性) 계수비(係數比).5 is the ratio of helium volume and the ratio of kinematic viscosity to air.
제6도는 헬륨용적비와 공기에 대한 열전달율비.6 is the ratio of helium volume and heat transfer rate to air.
제7도는 헬륨용적비와 직류방전 특성을 각기 나타낸 곡선도이다.7 is a curve diagram showing the helium volume ratio and DC discharge characteristics, respectively.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 프레임(frame) 2 : 냉각기1 frame 2 cooler
3 : 고정자 4 : 지지물3: stator 4: support
5 : 회전자 6 : 냉각팬5: rotor 6: cooling fan
7 : 베어링 9 : 공기와 헬륨을 혼합한 냉각매체7 Bearing 9: Cooling medium mixed with air and helium
본 고안은 가령 터어빈 발전기등 전폐형(全閉形) 회전전기기계의 냉각장치에 관한 것이다.The present invention relates to a cooling device for a totally enclosed rotary electric machine such as a turbine generator.
종래 이 종류의 회전전기기계의 냉각장치로서 일반에게 알려진 전폐내냉형(內冷形)의 터빈발전기를 제1도에 표시한다.The turbine generator of the totally enclosed refrigeration type | mold known to the general public as a cooling device of this type of rotary electric machine is shown in FIG.
제1도에 있어서, 1은 프레임이고, 그 내주측에 복수개의 냉각기(2)가 장착되어 있다. 3은 프레임의 내주에 지지물(4)를 통하여 설치된 고정자, 5는 상기 프레임(1)에 베어링(7)에 의하여 회전자재로 지지된 회전자이며, 그 소정부에는 냉각팬(6)이 설치되어 있다.In FIG. 1, 1 is a frame and the some cooler 2 is attached to the inner peripheral side. 3 is a stator provided on the inner circumference of the frame through the support 4, 5 is a rotor supported by the bearing 7 on the frame 1, and a cooling fan 6 is provided at the predetermined portion. have.
8은 기계내에 봉입된 냉각매체이며 이 경우는 공기이다.8 is the cooling medium enclosed in the machine, in this case air.
다음에 동작에 관하여 설명한다.Next, the operation will be described.
냉각기(2)에 의하여 냉각된 공기는 냉각팬(6)에 의하여 구동되며, 회전자(5), 회전자(5)와 고정자(3)사이의 공극, 고정자(3)의 중앙부후방으로 유입한다.The air cooled by the cooler 2 is driven by the cooling fan 6 and flows into the rotor 5, the gap between the rotor 5 and the stator 3, and behind the center of the stator 3. .
그리고, 회전자(5), 고정자(3)를 냉각하여 온도를 상승시켜 최종적으로 냉각기(2)로 안내된다.Then, the rotor 5 and the stator 3 are cooled to raise the temperature and finally guided to the cooler 2.
풍손(風損)은 고정자(3), 회전자(5)를 냉각하기 위한 공기의 구동손(損), 회전자(5)의 팬작용에 의한 손실, 회전에 의한 마찰손 등으로 이루어지며, 고속회전전기기계이면, 전손실중에서 점하는 비율은 매우 컸었다.Wind loss is composed of the stator (3), the driving hand of air for cooling the rotor (5), the loss by the fan action of the rotor (5), the friction loss by rotation, etc. For high speed rotary electric machines, the percentage of total losses was very large.
또 도면중 화살표는 냉각매체의 흐름을 나타낸다.In addition, the arrow in the figure shows the flow of a cooling medium.
이상과 같은 냉각매체가 공기의 경우에 있어서는 비중의 관계로 회전이 고속이 됨에 따라서 풍손도 커지고 따라서 소형화, 고효율화가 어렵게 되고, 또 냉각매체를 수소로 하면 폭발성을 지니므로 고순도 감시장치, 밀봉장치, 폭발구조 등이 필요하게 되고, 냉각매체를 교환할 때에도 공기의 혼합을 피하기 위하여 장시간을 요하는 등 결점이 있었다.In the case of air as described above, in the case of air, due to the specific gravity, the rotation speed is high, so the windage loss becomes large. Therefore, miniaturization and high efficiency are difficult, and if the cooling medium is hydrogen, it is explosive. Therefore, high purity monitoring device, sealing device, An explosion structure and the like are required, and a long time is required to avoid mixing of air even when the cooling medium is replaced.
본 고안은 상기 종래의 것의 결점을 제거하기 위한 것이며, 냉각매체로서, 공기보다 비중이 작으며 또한 폭발성이 없는 헬륨과 공기를 가장 적합하게 혼합하여 저풍손, 고냉각성능을 지닌 높은 효율의 회전전기기계의 냉각장치를 제공함으로 목적으로 하고 있다.The present invention is intended to eliminate the drawbacks of the conventional one, and as a cooling medium, a high efficiency rotary electric machine having a low windage loss and a high cooling performance by mixing helium and air, which have a specific gravity less than that of air and which is not explosive, most suitably It aims to provide a cooling device for the machine.
이하 본 고안의 한 실시예를 도면에 의하여 설명한다.Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
제2도에 있어서, 9는 기계내에 봉입된 냉각매체이며, 이 냉각매체는 공기와 헬륨의 혼합가스로 되어 있다.In FIG. 2, 9 is a cooling medium enclosed in a machine, and this cooling medium is a mixed gas of air and helium.
따라서, 프레임(1)은 공기를 냉각매체로한 종래의 전기기계보다도 밀봉도가 높아지도록 결합 및 관통부분에는 모두 적당한 밀봉장치 예를들면 정지결합부는 0링, 패킹등으로 베어링(7)의 축관통부의 공극부는 미캐니컬실(mechanical seals), 오일실(oil seal), 유체의 원심력을 이용하는 유체에 의한 실, 레버린스패킹(labyrinthpacking), 그리고 래버린스의 중간에 가스를 압입하여 가스압으로 내부로부터의 누출을 방지하는 래버린스부의 에어실등의 공지된 밀방장치(seal)을 이용하여 밀봉도를 일정하게 유지하여 공기와 헬륨의 혼합가스의 용적비가 일정하게 유지되도록 구성되어 있다.Therefore, the frame 1 is suitable for both the coupling and the penetrating portion so that the sealing degree is higher than that of a conventional electric machine using air as a cooling medium. The air gaps are pressurized from the inside by gas pressure in the middle of mechanical seals, oil seals, fluid-based seals using fluid centrifugal force, labyrinthpacking, and labyrinth. By using a known seal such as an air chamber of the labyrinth part which prevents the leakage of oil, the sealing ratio is kept constant so that the volume ratio of the mixed gas of air and helium is kept constant.
또 그밖의 구성은 종래와 같으므로 새삼 설명을 생략한다.In addition, since the other structure is the same as the conventional description, it abbreviate | omits description.
다음에 냉각매체가 헬륨과 공기의 혼합가스의 경우를 공기만의 경우와 비교하여 설명한다.Next, the case where the cooling medium is a mixed gas of helium and air will be described in comparison with the case of air only.
풍손은 일반적으로 비중에 비레하므로 제3도와 같이 헬륨의 용적비가 클수록 저감된다.As windage is generally proportional to specific gravity, the larger the volume ratio of helium is, the lower the ratio is.
또 반대로 열전도율, 동점성 계수는 다같이 제4도, 제5도에 표시한 바와같이 헬륨의 용적비가 클수록 향상한다.On the contrary, the thermal conductivity and the dynamic viscosity coefficient both improve as the volume ratio of helium increases, as shown in FIG. 4 and FIG.
여기에서 열전달률 α는 레이놀즈(reynolds)수(Re=U.L/N, U : 유속, L : 대표길이 N : 동점성계수)의 0.8승과 열전도율 K에 비례하므로 동일조건에서 냉각매체만을 공기에서 헬륨과 공기의 혼합가스로한 경우, 제6도에 보인것같이 헬륨의 용적비가 60~70%에서 정점을 갖는 곡선이 되고, 그 헬륨의 용적비에서 공기만의 경우의 약 1.6배의 열전달율을 얻을 수가 있다. 또 이때의 풍손은 비중에서 50~60% 저감된다.Here, the heat transfer rate α is proportional to the 0.8 power of the Reynolds number (Re = UL / N, U: flow rate, L: representative length N: kinematic viscosity) and the thermal conductivity K. In the case of the mixed gas of air, as shown in FIG. 6, the volume ratio of helium becomes a curve having a peak at 60 to 70%, and the heat transfer rate of about 1.6 times that of air only can be obtained from the volume ratio of helium. In addition, wind loss at this time is reduced by 50 to 60% in specific gravity.
풍손 저감만을 목적으로 할 경우 헬륨만을 냉각매체로 하면 되지만, 제7도에 보인것 같이 실험에서 방전특성은 헬륨의 용적비와 더불어 악화하며, 헬륨만으로는 방전특성이 매우 나쁘다.Only the helium may be used as a cooling medium for the purpose of reducing windage loss. However, as shown in FIG. 7, the discharge characteristics deteriorate with the volume ratio of helium, and the discharge characteristics are very bad with helium alone.
이러한 이유에서 헬륨의 용적비를 40~0%로 하여 냉매로 사용할 때 저풍손, 고열전달율이 최상의 상태로 실현된다.For this reason, low windage loss and high heat transfer rate are realized in the best state when used as a refrigerant with a volume ratio of helium of 40 to 0%.
또 헬륨은 불활성 가스이므로 해서 절연의 장수명화도 기대할 수 있다.In addition, since helium is an inert gas, the long life of the insulation can be expected.
또 혼합가스는 대기압에서 사용이 가능하므로 공기를 냉매로 한 회전전기기계의 구조를 바꾸는 일없이 실용화가 가능하다.In addition, since mixed gas can be used at atmospheric pressure, it can be put into practical use without changing the structure of a rotary electric machine using air as a refrigerant.
또 상기 실시예에서는 대기압에 있어서의 혼합가스 사용이지만, 가압하여 사용함으로서 고레이놀즈수, 고열전달율을 얻을 수 있으며 또 혼합가스의 고비중화에 의하여 냉각기의 소형화도 가능하다.In the above embodiment, the mixed gas at atmospheric pressure is used, but by pressurizing it, a high Reynolds number and a high heat transfer rate can be obtained, and the cooler can be downsized by high specific gravity of the mixed gas.
이상과같이 본 고안에 의하면 전폐형 회전전기기계의 내부에 봉비되는 냉각매체로서, 공기와 헬륨을 가장 적합하게 혼합한 가스로 한 것이므로 풍손이 대폭으로 저감될 수 있으며 또한 열전달율이 향상되기 때문에 회전전기기계의 성능을 제한하는 코일온도를 저하시켜 소형화할 수가 있다.As described above, according to the present invention, the cooling medium is enclosed inside the totally enclosed rotary electric machine, and the air and helium is the most suitable gas mixture, so wind loss can be greatly reduced, and the heat transfer rate is improved. It can be miniaturized by lowering the coil temperature limiting the performance of the machine.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59017833A JPS60162432A (en) | 1984-02-01 | 1984-02-01 | Cooler of fully-closed rotary electric machine |
JP17833 | 1984-02-01 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR850009597U KR850009597U (en) | 1985-12-05 |
KR890006992Y1 true KR890006992Y1 (en) | 1989-10-13 |
Family
ID=11954695
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR2019840011508U KR890006992Y1 (en) | 1984-02-01 | 1984-11-14 | System for cooling |
Country Status (2)
Country | Link |
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JP (1) | JPS60162432A (en) |
KR (1) | KR890006992Y1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101045270B1 (en) * | 2007-02-15 | 2011-06-29 | 다이킨 고교 가부시키가이샤 | Motor rotor and compressor with the same |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3289698B2 (en) | 1998-11-25 | 2002-06-10 | 株式会社日立製作所 | Rotating electric machine |
DE69923799T2 (en) | 1999-09-03 | 2006-02-09 | Hitachi, Ltd. | DYNAMOELECTRIC MACHINE |
US6737768B2 (en) | 2000-03-31 | 2004-05-18 | Hitachi, Ltd. | Rotating electric machine |
-
1984
- 1984-02-01 JP JP59017833A patent/JPS60162432A/en active Pending
- 1984-11-14 KR KR2019840011508U patent/KR890006992Y1/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101045270B1 (en) * | 2007-02-15 | 2011-06-29 | 다이킨 고교 가부시키가이샤 | Motor rotor and compressor with the same |
Also Published As
Publication number | Publication date |
---|---|
KR850009597U (en) | 1985-12-05 |
JPS60162432A (en) | 1985-08-24 |
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