KR910007675B1

KR910007675B1 - Totally enclosed rotary machine

Info

Publication number: KR910007675B1
Application number: KR1019870014644A
Authority: KR
Inventors: 노부오 하세가와; 에이이찌 오꾸야마
Original assignee: 가부시기가이샤 히다찌세이사꾸쇼; 미다 가쓰시게
Priority date: 1986-12-30
Filing date: 1987-12-21
Publication date: 1991-09-30
Also published as: KR880008496A; JPS63171135A; IN168547B

Abstract

내용 없음.No content.

Description

Totally enclosed rotator

제1도는 본 발명의 전폐형 회전기의 일실시예의 회전기의 평면도.1 is a plan view of a rotor of one embodiment of a totally closed rotor of the present invention.

제2도는 제1도에 나타낸 회전기의 요부의 종단면도.2 is a longitudinal cross-sectional view of the main portion of the rotor shown in FIG.

제3도는 제1도에 나타낸 회전기의 종단면도.3 is a longitudinal sectional view of the rotor shown in FIG.

제4도는 종래의 전폐형 회전기의 종단면도이다.4 is a longitudinal sectional view of a conventional fully enclosed rotary machine.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

2 : 회전기 본체 4 : 회전축2: rotating body 4: rotating shaft

6 : 외부팬 8 : 본체 냉각기6: external fan 8: body cooler

10 : 엔드커버 12 : 격벽부10: end cover 12: partition wall

18 : 입기구 30 : 베어링박스18: entrance 30: bearing box

32 : 냉각핀32: cooling fin

본 발명은 전폐형 회전기에 관한 것이다. 일본국실개소 55-78725호 공보에 기재되어 있는 종래의 전폐형 회전기는 외부팬이 두 계통의 베인을 가지고, 한 계통은 본체 냉각풍, 다른 한 계통은 베어링 냉각전용으로 되어 있다. 종래 기술과 비교해 볼 때 이 기술은 이 공보이전의 기술에 대하여 베어링 전용의 베인의 추가분 만큼 기계손실이 증대하고 회전기의 효율을 저하시켜 팬형상도 복잡화되어 회전기 전체가 대형화하여 가격이 상승하는 점에 대해서는 배려되어 있지 않았다. 즉 제4도에 나타낸 바와 같이 일본국실개소 55-78725호의 전폐형 회전기는 그 상부에 외부팬(106)을 가지는 회전축 (104)을 구비한다. 이 회전축(104)은 또 본체 냉각기(108)를 가지는 회전기 본체 (102)를 지탱한다. 외부팬(106)과 함께 회전기의 단부는 입기구(入氣口)(118)를 가지는 엔드커버(110)로 덮인다. 외부팬(106)측의 회전축(104)의 단부는 베어링박스 (130)내에 수납된 베어링(128)으로 지지된다. 외부팬(106)은 본체 냉각용 베인 (106a)과 베어링 냉각용 베인(106b)을 가진다. 그리고 입기구(118)로부터 외부팬 (106)의 본체 냉각용 베인(106a)을 거쳐 도입한 본체 냉각통풍로(142), 본체 냉각기 (108)을 통과한 냉각풍으로 회전기 본체(102)를 냉각하고 있다. 한편 냉각핀을 구비한 베어링박스(130)내의 베어링(128)을 외부팬의 베어링 냉각용 베인(106b)에서 입기구를 거쳐 도입하고 그 입구에 풍량 조정판(148)을 가지고 베어링 냉각통풍로(140)를 통과한 냉각풍으로 냉각되고 있다.The present invention relates to an enclosed rotary machine. The conventional totally closed rotor described in Japanese Patent Application Laid-Open No. 55-78725 has an outer fan having two vanes, one main body cooling wind, and the other system exclusively for bearing cooling. Compared with the prior art, this technique increases the mechanical loss by adding an additional vane for bearings, lowers the efficiency of the rotor, complicates the fan shape, and increases the overall size of the rotor. It was not considered about. That is, as shown in FIG. 4, the fully closed rotary machine of Japanese Patent Application Laid-Open No. 55-78725 has a rotating shaft 104 having an outer fan 106 thereon. The rotary shaft 104 also supports the rotor body 102 having a body cooler 108. The end of the rotor together with the outer fan 106 is covered with an end cover 110 having an inlet 118. The end of the rotating shaft 104 on the outer fan 106 side is supported by a bearing 128 housed in the bearing box 130. The outer fan 106 has a main body cooling vane 106a and a bearing cooling vane 106b. The rotator main body 102 is cooled by the main body cooling ventilation passage 142 introduced through the main body cooling vane 106a of the outer fan 106 and the cooling air passing through the main body cooler 108 from the inlet 118. have. On the other hand, the bearing 128 in the bearing box 130 having the cooling fin is introduced from the bearing cooling vane 106b of the outer fan through the inlet, and has the air volume adjusting plate 148 at the inlet thereof. It is cooled by the cooling wind which passed.

상기 종래기술은 외부팬(106)의 치수, 형상과 기계손실의 증대에 의한 회전기의 효율저하에 관한 점에 대한 배려가 없어 팬치수의 대형화, 형상의 복잡화에 의한 외부팬의 가격상승과 기계손실 증대에 의한 회전기 전체가 대형화 된다는 문제가 있었다.The prior art has no concern about the reduction in the efficiency of the rotor due to the increase in the size, shape and mechanical loss of the external fan 106, so that the price of the external fan is increased and the mechanical loss is increased due to the enlargement of the fan size and complexity of the shape. There was a problem that the entire rotor was enlarged by the increase.

본 발명은 상기한 점에 감안하여 이루어진 것으로서, 외부팬의 소형화를 가능하게 한 전폐형 회전기를 제공하는 것을 목적으로 한다.SUMMARY OF THE INVENTION The present invention has been made in view of the above point, and an object thereof is to provide a totally closed type rotor that enables miniaturization of an external fan.

본 발명에 의하면 상기 목적을 달성하기 위하여 회전축을 가지는 회전기 본체와, 상기 회전축의 단부에 설치된 외부팬과, 상기 회전기 본체내에 설치된 본체 냉각기와, 상기 회전체 본체의 단부를 덮는 엔드커버와, 상기 엔드커버에 설치된 입기구와, 상기 회전축의 단부상에 설치된 베어링과, 상기 냉각풍을 상기 입기구로부터 상기 외부팬에 안내하는 제1냉각통풍로와, 상기 베어링을 냉각하는 냉각풍이 통과하는 제2냉각풍 통풍로와, 상기 냉각풍을 상기 외부팬으로부터 상기 본체 냉각기에 안내하는 제3냉각풍 통풍로와, 상기 제1의 냉각통풍로와 상기 제2의 냉각통풍로를 연통하는 제1연결관과, 상기 제2의 냉각통풍로와, 상기 제3의 냉각통풍로를 연통시키는 제2연결관 등을 구비하고, 상기 입기구로부터 외부팬을 거쳐 도입한 냉각풍의 일부로 상기 베어링을 냉각하도록 한 전폐형 회전기가 제공된다.According to the present invention, in order to achieve the above object, a rotor body having a rotating shaft, an outer fan provided at an end of the rotating shaft, a body cooler provided in the rotating body, an end cover covering an end of the rotating body, and the end. A second cooling wind ventilation through which an inlet provided in a cover, a bearing provided on an end of the rotary shaft, a first cooling ventilation passage guiding the cooling wind from the inlet to the external fan, and a cooling wind for cooling the bearing pass therethrough A furnace, a third cooling wind ventilation path for guiding the cooling wind from the external fan to the main body cooler, a first connecting pipe communicating the first cooling ventilation path and the second cooling ventilation path, and And a second connecting pipe or the like for communicating the second cooling ventilation passage and the third cooling ventilation passage, and the part of the cooling wind introduced through the external fan from the inlet. An enclosed rotor is provided to cool the bearing.

본 발명의 전폐형 회전기에 의하면, 입기구로부터 외부팬을 거쳐 제1의 냉각풍통로에 도입된 냉각풍은 그 일부가 제3냉각풍통로, 본체 냉각기를 거쳐 회전기 본체의 냉각에 사용되나, 다른 일부는 제1연결관을 거쳐 베어링을 냉각한 후 제2냉각관을 통하여 본체 냉각통풍로에 흐른다. 따라서 종래와 같이 외부팬에 베어링 냉각용의 베인을 설치할 필요가 없고, 외부팬을 소형화할 수가 있어 회전기의 기계손실을 감소시키고 효율을 향상시킬 수가 있다. 또한, 베어링을 냉각한 후의 냉각풍의 온도 상승은 회전기 본체를 냉각한 후의 냉각풍의 온도상승의 수분의 일정도에 불과하므로 베어링을 냉각한 후에도 충분히 회전기 본체를 냉각할 수가 있다.According to the enclosed rotary machine of the present invention, the cooling air introduced into the first cooling air passage through the external fan from the inlet is partially used for cooling the rotor body via the third cooling air passage, the main body cooler, After cooling the bearing via the first connecting pipe flows to the main body cooling passage through the second cooling pipe. Therefore, there is no need to provide vanes for bearing cooling in the outer fan as in the prior art, and the outer fan can be miniaturized, thereby reducing the mechanical loss of the rotor and improving the efficiency. Moreover, since the temperature rise of the cooling wind after cooling a bearing is only a certain degree of the moisture of the temperature rise of the cooling wind after cooling a rotor main body, a rotor body can be fully cooled even after cooling a bearing.

이하 도시한 실시예에 의거하여 본 발명을 설명한다.Hereinafter, the present invention will be described based on the illustrated embodiment.

제1도 내지 제3도에 나타낸 본 발명의 일실시예에 의한 전폐형 회전기는 회전축(4)을 가지는 회전기 본체(2), 회전축(4)의 상단부에 설치된 외부팬(6), 회전기 본체(2)내에 설치된 본체 냉각기(8), 회전기 본체의 단부를 덮는 엔드커버(10)를 구비하고 있다. 외부팬(6)은 그 상면에 베인(6a)을 가지고 있다. 엔드커버(10)는 외부팬 (6)에 인접하여 바로 위의 격벽부(12), 격벽부(12)보다 위의 상부(14), 격벽부(12)보다 아래의 하부(16)를 가진다. 상부(14)에는 외부팬(6)을 거쳐 냉각풍이 흡입되는 입기구(18)가 설치되어 있다. 격벽부(12)는 외부팬(6)에 인접하는 부분에 원형의 구멍(20)을 가진다. 엔드커버(10)의 하부(16)는 외부팬(6)의 바로 밑의 수평판(22)과, 이 수평판(22)의 단부로부터 수직 하방으로 신장되어 회전기 본체(2) 또는 본체 냉각기(8)의 상단면에 연결되는 수직벽부(24)와, 격벽부(12)의 단부로부터 수직아래방향으로 신장되어 본체 냉각기(8)의 상단면의 단부에 연결되는 다른 수직벽부(26)를 가진다.1 to 3, the totally closed rotor according to the embodiment of the present invention, the rotor main body 2 having a rotary shaft 4, the outer fan 6 installed on the upper end of the rotary shaft 4, the rotor main body ( The main body cooler 8 provided in 2) and the end cover 10 which cover the edge part of a rotor main body are provided. The outer fan 6 has vanes 6a on its upper surface. The end cover 10 has a partition 12 directly above the outer fan 6, an upper portion 14 above the partition 12, and a lower portion 16 below the partition 12. . The upper portion 14 is provided with an inlet 18 through which the cooling air is sucked through the outer fan 6. The partition 12 has a circular hole 20 in a portion adjacent to the outer fan 6. The lower portion 16 of the end cover 10 extends vertically downward from an end of the horizontal plate 22 and the horizontal plate 22 immediately below the outer fan 6, and the rotor body 2 or the body cooler ( The vertical wall portion 24 connected to the upper end surface of 8) and the other vertical wall portion 26 extending vertically downward from the end of the partition wall portion 12 and connected to the end of the upper surface of the main body cooler 8. Has

본 발명의 일실시예에 의한 전폐형 회전기는 다시 회전축(4)상의 외부팬(6)에 가까운 단부에 설치된 베어링(28), 이 베어링(28)을 수납하는 베어링박스를 구비하고 있다. 베어링박스(30)는 그 외면에 냉각핀(32)을 가진다. 베어링박스(30)는 지지체 (34)에 의하여 엔드커버(10)의 도면에서 좌단부를 지지한다. 엔드커버(10)의 상부(14)와 격벽부(12)는 그 사이에 냉각풍을 입기구(18)로부터 외부팬(6)에 안내하는 제1냉각풍통로(36)를 형성하고 있다. 베어링박스(30)의 주위에는 베어링박스(30)를 커버하여 베어링 냉각풍 통로용 커버(38)가 설치되고, 이 커버(38)와 베어링박스(30)의 사이에 베어링(28)을 냉각하는 냉각풍이 통과하는 제2냉각풍통로 (40)를 형성하고 있다. 격벽부(12), 수직벽부(24), 수직벽부(26) 및 본체 냉각기(8)의 상면은 외부팬(6)을 거쳐 흡입된 냉각풍을 본체 냉각기(8)에 안내하는 제3냉각풍통로(42)를 형성한다.The fully enclosed rotary machine according to an embodiment of the present invention includes a bearing 28 installed at an end close to the outer fan 6 on the rotating shaft 4, and a bearing box for accommodating the bearing 28. The bearing box 30 has a cooling fin 32 on its outer surface. The bearing box 30 supports the left end in the drawing of the end cover 10 by the support 34. The upper part 14 and the partition part 12 of the end cover 10 form the 1st cooling air flow path 36 which guides cooling air from the inlet 18 to the outer fan 6 between them. The bearing box 30 is provided around the bearing box 30 to cover the bearing cooling wind passage 38, and the bearing 28 is cooled between the cover 38 and the bearing box 30. The second cooling air passage 40 through which the cooling wind passes is formed. The upper surface of the partition 12, the vertical wall 24, the vertical wall 26, and the main body cooler 8 includes a third that guides the cooling air sucked through the outer fan 6 to the main body cooler 8. The cooling air passage 42 is formed.

제1연결관(44), (44)은 그 일단을 엔드커버(10)의 하부(16)의 수평판(22) 가까이에 접속되고, 타단을 베어링 냉각풍 통로용 커버(38)에 접속된다. 이 제1연결관 (44), (44)은 외부로부터 흡입된 냉각풍이 최초로 통과하는 제1냉각풍통로(36)와, 베어링(28)을 냉각하는 냉각풍이 통과하는 제2냉각풍통로(40)를 연통한다. 제2연결관 (46)이 회전체 본체(2) 가까이에 설치되고, 그 일단을 베어링 냉각풍 통로용 커버(38)에 연결되고, 타단을 엔드커버(10)의 수직벽부(24)에 접속된다. 이 연결관(46)은 베어링(28)을 냉각하는 냉각풍이 흐르는 제2냉각풍통로(40)와, 제1냉각풍통로(36)로부터의 냉각풍을 본체 냉각기(8)에 향하여 흐르는 제3냉각풍통로(42)와 연통시킨다. 도시한 예에 있어서 제1연결관이 두 개의 관으로 이루어져 있으나 하나이더라도 좋다. 제1연결관(44),(44)의 총단면적, 즉 제1연결관(44),(44)의 총합배출량은 제2연결관 (46)보다 크게하여 제3냉각풍통로(42)로부터 제2냉각풍통로(40)에의 역류를 방지한다.One end of the first connecting pipes 44 and 44 is connected to the horizontal plate 22 of the lower portion 16 of the end cover 10, and the other end thereof is connected to the bearing cooling wind passage cover 38. . The first connecting pipes 44 and 44 have a first cooling air passage 36 through which the cooling wind sucked from the outside passes first, and a second cooling air passage 40 through which the cooling wind for cooling the bearing 28 passes. ). The second connecting pipe 46 is installed near the rotor body 2, one end of which is connected to the cover for bearing cooling wind passage 38, and the other end of which is connected to the vertical wall portion 24 of the end cover 10. Connected. The connecting pipe 46 has a second cooling wind passage 40 through which cooling wind for cooling the bearing 28 flows, and a third flow of cooling air from the first cooling wind passage 36 toward the main body cooler 8. In communication with the cooling air passage (42). In the illustrated example, the first connecting tube is composed of two tubes, but may be one. The total cross-sectional area of the first connecting pipes 44 and 44, that is, the total discharge amount of the first connecting pipes 44 and 44 is larger than that of the second connecting pipe 46, so that the third cooling air passage 42 may be discharged. The backflow to the second cooling air passage 40 is prevented.

제2도로부터 명백한 바와 같이 제2냉각풍통로(40)와, 제1냉각풍통로(36) 및 제3냉각풍통로(42)는 각각 제1연결관(44) 및 제2연결관(46)으로 연결되어 있는 이외에는 대기를 거쳐 분리되어 있다.As is apparent from FIG. 2, the second cooling air passage 40, the first cooling air passage 36, and the third cooling air passage 42 each have a first connecting pipe 44 and a second connecting pipe 46. Are separated via air except for

상기한 바와 같이 베어링(28)을 냉각하는 냉각풍이 통과하는 제2냉각풍통로 (40)와, 입기구(18)로부터 외부팬(6)을 거쳐 도입된 냉각풍을 본체 냉각기(8)에 안내하는 제3냉각풍통로(42)를 연통하는 제2의 연결관(46)을 설치하여 입기구(18)로부터 외부팬을 거쳐 도입한 냉각충의 일부로 베어링(8)을 냉각하도록 하였다. 이와 같이 함으로서 입기구(18)로부터 외부팬(6)으로 도입한 냉각풍의 일부로 베어링(8)을 냉각되게 되어 외부팬(6)에 종래와 같이 두 계통의 베인 즉 본체 냉각용 베인과 베어링냉각용 베인을 설치할 필요가 없이한 계통의 베인(6a)만이면 되므로 외부팬(6)의 소형화를 가능하게 한 전폐형 회전기를 얻을 수가 있다. 즉 외부팬(6)에 의하여 냉각풍은 제2도에서 화살표로 표시한 바와 같이 엔드커버(10)의 입기구로부터 제1냉각풍통로(36)에 들어가고, 이어서 제3냉각풍통로(42)와, 제1연결관(44)으로 나누어져 송입된다. 제3냉각풍통로(42)에 송입된 냉각풍은 본체 냉각기(38)를 통하여 회전기 본체(2)내부의 공기를 냉각하고, 외부로 배출된다. 한편, 제1연결관(44)에 송입된 냉각풍은 베어링 냉각풍통로인 제2냉각풍통로(40)에 들어가 베어링박스(30)의 표면과 그 표면에 장착된 냉각핀(32)으로부터 열을 흡수하고, 그 다음 제2연결관(46)을 통하여 제3냉각풍통로 (42)에 합류하여 본체 냉각기(3)에 유입하여 회전기 본체(2)의 내부공기를 냉각한다. 이 경우에 제2냉각풍통로(40)에 송입되는 냉각풍은 풍량 조정판(48)으로 그 통풍량이 조정될 수 있게 되어 있다.As described above, the second cooling air passage 40 through which the cooling wind for cooling the bearing 28 passes, and the cooling air introduced from the inlet 18 via the external fan 6 to the main body cooler 8. A second connecting pipe 46 communicating with the third cooling air passage 42 was provided to cool the bearing 8 by a part of the cooling worm introduced from the inlet 18 through the external fan. In this way, the bearing 8 is cooled by a part of the cooling wind introduced from the inlet 18 to the outer fan 6, so that the vane of the two systems, that is, the main body cooling vane and the bearing cooling vane, in the outer fan 6 as in the prior art. Since only the vanes 6a of the system need not be installed, a fully closed rotor capable of miniaturizing the outer fan 6 can be obtained. That is, by the external fan 6, the cooling wind enters the first cooling air passage 36 from the inlet of the end cover 10, as indicated by the arrows in FIG. 2, and then the third cooling air passage 42 and , Divided into the first connecting pipe 44 is fed. The cooling air fed into the third cooling air passage 42 cools the air inside the rotor body 2 through the body cooler 38 and is discharged to the outside. On the other hand, the cooling air fed into the first connection pipe 44 enters the second cooling air passage 40, which is the bearing cooling air passage, and heats the surface of the bearing box 30 and the cooling fins 32 mounted on the surface thereof. Absorbs and then joins the third cooling air passage (42) through the second connecting pipe (46) to flow into the body cooler (3) to cool the internal air of the rotor body (2). In this case, the cooling air fed into the second cooling air passage 40 is controlled by the air volume adjusting plate 48.

이와 같이 본 실시예에 의하면 종래의 베어링 냉각전용 베인이 필요 없어 한 계통의 베인(6a)을 가지고 회전체 본체를 냉각할 수 있는 풍량으로 베어링도 냉각할 수 있으므로 외부팬(6)의 소형화에 의한 기계손실의 약 18%의 저감 및 회전기의 약 0.3%의 효율향상 효과를 나타낼 수가 있다. 또 외부팬(6)의 두 계통의 베인을 필요로 하지 않는 형상간략화에 의하여 표준화를 가능하게 하는 효과를 나타낼 수가 있고, 특히 비철제의 외부팬(6)의 경우는 그 금형값이 외부팬(6)의 값에 대하여 약 8배의 값을 요하므로 경제성 향상의 효과도 크다.As described above, according to the present embodiment, since the conventional vane for exclusive use of bearing cooling is not required, the bearing can be cooled with the air volume capable of cooling the rotor body with the vane 6a of one system. It can reduce the mechanical loss by about 18% and improve the efficiency of the rotor by about 0.3%. In addition, it is possible to achieve the effect of standardization by simplifying the shape that does not require the vane of the two systems of the outer fan (6), especially in the case of the non-ferrous outer fan (6) the mold value is the outer fan ( As the value of 6) is required about 8 times, the effect of economic improvement is also great.

이상 설명한 바와 같이 본 발명에 의하면 전폐형 회전기의 외부팬을 소형화 할 수가 있다.As described above, according to the present invention, the external fan of the totally closed rotor can be miniaturized.

Claims

A rotor body having a rotating shaft, an outer fan provided at an end of the rotating shaft, a body cooler provided in the rotating body, an end cover covering an end of the rotating body, an inlet provided at the end cover, and an end of the rotating shaft. A bearing installed in the floating position, a first cooling ventilation passage guiding the cooling wind from the inlet to the external fan, a second cooling wind ventilation passage through which the cooling wind cooling the bearing passes, and the cooling wind to the external fan. A third cooling wind vent that guides the main body cooler to the main body, a first connecting pipe means communicating the first cooling vent and the second cooling vent, the second cooling vent and the third cooling vent And a second connecting pipe means communicating with the furnace, wherein the bearing is cooled by a part of the cooling wind introduced from the inlet through the outer fan. group.

The totally closed rotor according to claim 1, wherein the outer fan has a single system of vanes.

According to claim 1, The totally closed rotor has a bearing box for receiving the bearing, the cover is installed around the bearing box to cover the bearing box, the second cooling air passage of the cover and the bearing box Totally closed rotor, characterized in that formed between.

The method of claim 1, wherein the end cover has a partition portion has a partition portion, an upper portion above, a lower portion below the partition wall portion, wherein the first cooling air passage is defined by the upper portion and the partition wall portion. Fully enclosed rotator.

The method of claim 1, wherein the end cover has a partition wall portion, an upper portion above the partition wall portion, a lower portion below the partition wall portion, and the third cooling air passage is defined by the lower portion and the partition wall portion. Fully enclosed rotator.

The totally enclosed rotary machine according to claim 1, wherein the discharge amount of the second connecting pipe means is designed to be larger than the discharge amount of the first connecting pipe means.

The totally enclosed rotor of claim 1, wherein the second connector is connected to the third cooling air passage near the rotor body.

A rotor body having a rotating shaft, an outer fan provided at an end of the rotating shaft, a body cooler provided in the rotating body, an end cover covering an end of the rotating body, an inlet provided at the end cover, and the end of the rotating shaft. A bearing installed in the float, a first cooling wind ventilation path for guiding the cooling wind from the inlet to the external fan, a second cooling wind ventilation path for passing the cooling air for cooling the bearing, and the cooling air to the outside. A third cooling wind ventilation path separated from the first cooling wind ventilation path and the second cooling wind ventilation path through the air by guiding the fan to the main body cooler, and the first cooling wind ventilation path and the second cooling fan ventilation path; A first connecting pipe means communicating with a cooling wind ventilation path, said second cooling wind ventilation path, and a second connecting pipe means communicating with said third cooling wind ventilation path, Port part from a cooling air introduced through the outside totally enclosed fan rotary machine, characterized in that to cool the bearing.

According to claim 8, The totally closed rotor has a bearing box for accommodating the bearing, the cover is installed around the bearing box to cover the bearing box, the second cooling wind ventilation path is the cover and the bearing box The totally closed rotor, characterized in that formed between.

9. The fully closed rotor according to claim 8, wherein the outer fan has a single system of vanes.

The method of claim 8, wherein the end cover has a partition wall, an upper portion above the partition portion, a lower portion below the partition wall portion, and the first cooling wind vent is formed by the upper portion and the partition wall portion. Fully enclosed rotator.

9. The method of claim 8, wherein the end cover has a partition wall portion, an upper portion above the partition portion, a lower portion below the partition portion, and the third cooling wind vent is formed by the lower portion and the partition portion. Fully enclosed rotator.

The totally closed rotor according to claim 8, wherein the discharge amount of the second connecting pipe means is designed to be larger than that of the first connecting pipe means.

The totally closed rotor according to claim 8, wherein the second connecting pipe means is connected to the third cooling wind vent near the rotor body.