JP2003111356A - Air-cooled fully-enclosed rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an air-cooled fully-enclosed rotating electric machine which can eliminate ozone and nitric acid gas generated in the machine by a discharge of a stator winding, etc., without deteriorating the cooling effect. SOLUTION: This air-cooled fully-enclosed rotating electric machine has a stator 1 having a stator core 2 on which stator windings 4 are wound, a frame 15 surrounding the stator 1, a rotor 5 having a rotor core 6 which faces the stator core 2 with a gap 11, fans 9 and 10 circulating cooling air for cooling the stator 1 and the rotor 5 in the frame 15, and a filter 25 having an eliminating agent layer 27 which is provided in a passage of the cooling air and eliminates ozone and nitric acid gas generated in the frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-cooled fully-closed rotary electric machine provided with a filter device for removing at least one of nitric acid gas and ozone generated from ozone generated by discharge of a stator winding or the like. Is.

[0002]

2. Description of the Related Art Conventionally, when a rotary electric machine such as a turbine generator or an induction motor is installed in a bad environment such as a geothermal power plant exposed to hydrogen sulfide gas, conventionally, a fully enclosed internal cooling type or a fully enclosed external fan type is used. It is general to improve the reliability of the environment resistance by applying the fully closed type jacket structure. However, in rotating electrical machines, the discharge preventive paint deteriorates with age over many years due to various complex factors such as mechanical wear due to slackening of the stator wedge due to withering of the insulation part, and uneven coating of the discharge preventive paint. Then, it may be partially peeled off. When the discharge preventive paint peels off, corona discharge may occur from that portion as a starting point, and ozone may be generated. Then,
There is a possibility that ozone reacts with nitrogen in the air to generate NOx, and further reacts with moisture in the machine to generate nitric acid gas, which corrodes metal structural members inside the rotating electric machine. As a measure for preventing such a problem caused inside the rotating electric machine main body, it is necessary to take other preventive measures regardless of the outer cover structure. However, there is no suitable method other than applying a discharge preventive paint to suppress the occurrence of corona discharge. In recent years, due to the shortened installation period and ease of maintenance, the conventional hydrogen cooling system has been used for manufacturing 200-300 MW.
With the progress of materials and cooling technology, class fully enclosed rotating electrical machines have become possible to be manufactured by the air cooling method. Air-cooled fully enclosed rotary electric machines are becoming larger and higher in voltage. With the increase in voltage, the amount of ozone generated and the amount of nitric acid gas produced tend to increase. There is a need for measures to remove ozone and nitric acid gas generated in Japan.

Japanese Patent Laid-Open Publication No. 6-66246 discloses a fully closed air-cooled turbine generator equipped with a hydrogen sulfide gas removal filter device for removing hydrogen sulfide gas that has entered the machine together with outside air from bearing clearances and other locations. It is described in. This fully-closed air-cooled turbine generator is a rotor fan provided on a rotor of a generator, a hydrogen sulfide gas removing filter device, and the internal pressure of the rotor fan is removed by utilizing the differential pressure across the rotor fan. And air piping leading to the filter device. According to this fully-closed air-cooled turbine generator, hydrogen sulfide gas that has entered the inside from the outside can be removed, and it is possible to prevent corrosion inside the generator.

[0004]

As described above, in the fully closed air-cooled turbine generator disclosed in Japanese Patent Laid-Open No. 6-66246, hydrogen sulfide gas contained in the air at the installation site is stored in the generator. It is provided with a filter device for removing the invaded matter, and is not effective for removing ozone and nitric acid gas generated in the machine by the fully-closed rotating electric machine itself, which is the problem to be solved by the present invention, and can be a solution. Was not.

The present invention has been made to solve the above problems, and removes nitric acid gas generated in a rotating electric machine from ozone generated by discharge of a stator winding or the like to rotate An object of the present invention is to provide a fully-closed rotating electric machine that effectively prevents corrosion of metal structural members in the electric machine and does not impair the cooling effect of the rotating electric machine when removing nitric acid gas.

[0006]

An air-cooled fully-closed rotating electric machine according to the present invention includes a stator having a stator winding and a stator core around which the stator winding is wound, and the stator core. An enclosing frame, a rotor having a rotor core facing the stator core via a gap, a fan provided in the rotor for circulating cooling air to the stator and the rotor in the frame, and A filter device is provided which is provided in the passage of the cooling air and has a removing agent for removing at least one of ozone and nitric acid gas generated in the frame.

Further, the air-cooled fully-closed rotary electric machine according to the present invention has a stator having a stator winding and a stator core around which the stator winding is wound, a frame surrounding the stator core, A rotor having a rotor core facing the stator core via a gap and a fan for pumping the cooling air in the intake passage to the inner circumference of the stator core, the rotor being provided in the rotor and fixed in the frame. A fan that circulates cooling air to the child and the rotor, a filter device that is provided outside the frame and has a remover that removes at least one of ozone and nitric acid gas generated in the frame, and is pumped by the fan. An air guide member is provided to guide a part of the cooling air from the outlet side of the fan and pass the filter device.

Further, the air-cooled fully-closed rotating electric machine according to the present invention is characterized in that the air guide member is provided with an air amount adjusting means for adjusting the amount of air passing through the filter device.

Further, in the air-cooled fully-closed rotary electric machine according to the present invention, a part of the cooling air to be pumped is led out from the vicinity of the back of one coil end portion of the coil end portions at both ends of the stator winding. , And is configured to be introduced to the other coil end portion side.

Further, in the air-cooled fully-closed rotary electric machine according to the present invention, a part of the cooling air to be pumped is drawn out from the vicinity of the back of each coil end portion of both ends of the stator winding, and sucked by the fan. It is characterized in that it is configured to be introduced to the side.

Further, in the air-cooled fully-closed rotary electric machine according to the present invention, a part of the cooling air to be pumped is selected in the range of 0.1 to 3.0% of the total amount of cooling air in the rotary electric machine. It is characterized by being.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an air-cooled, fully-enclosed, internally-cooled turbine generator, which is Embodiment 1 of the present invention, in a lateral cross-section. The air-cooled, fully-enclosed, internally-cooled turbine generator according to Embodiment 1 shown in FIG. 1 is roughly divided into a stator 1, a rotor 5, fans 9, 10, a frame 15, and an air cooler 18. , 19
, Bearings 20 and 21, and a filter device 25.

To explain the general outline, the stator 1, the rotor 5 having the fans 9 and 10 mounted therein, the air coolers 18 and 19 and the filter device 25 are arranged in a frame 15 having a totally closed structure and are rotated. The rotating shaft 7 of the child 5 is supported by the bearings 20 and 21 supported by the frame 15, and the cooling air inside the machine pumped by the fans 9 and 10 is the rotor 5, the stator 1, the filter device 25, and the air cooling. Bowl 18, 1
An air passage is formed which circulates in the order of 9, the fans 9, 10.

Specifically, the stator 1 includes a stator core 2 and
It has a duct 3 and a stator winding 4. Rotor 5
Has a rotor magnetic pole 6, a rotary shaft 7, and a direct coupling portion 8. The rotating shaft 7 is rotatably supported by bearings 20 and 21, and the fans 9 and 10 are symmetrically attached to the ends of the rotating shaft 7. Air coolers 18, 19
Are symmetrically arranged in the exhaust passage 22 on the vicinity of both ends of the stator core 2. The filter device 25 has a pre-filter 26 assembled in a frame (not shown) and a gas removing agent layer 27, and in the exhaust passage 22, the air cooler 1 is provided.
It is arranged so that the cooling air can pass between the bottom portions of 8 and 19. The gas removing agent layer 27 is composed of two layers, a chemical adsorbent layer for removing nitric acid gas and an activated carbon layer for removing ozone.

Specifically, the stator core 2 is composed of a plurality of blocks in which silicon steel plates are laminated, and a duct 3 for ventilation is arranged between the blocks. A stator winding 4 is provided in a plurality of slots (not shown) provided in the stator core 2.
Is wound, and coil end portions 4a and 4b are respectively projected at the end portions of the stator core 2 on the direct coupling side and the non-direct coupling side. The rotor 5 is formed by integrally forming a plurality of massive rotor magnetic poles 6 that are rotor iron cores, a rotary shaft 7, and a direct coupling portion 8. The rotary shaft 7 has a direct coupling side and an anti-direct coupling side. Bearing 2
It is supported by 0 and 21. The stator core 2 is arranged in the frame 15, and the bearings 20 and 21 are supported by a bracket (not shown) attached to the frame 15, so that there is a gap between the outer circumference of the rotor magnetic pole 6 and the inner circumference of the stator core 2. Separated by 11.

Inside the frame 15, the shroud plates on the direct connection side and the anti-direct connection side, which are formed so as to cover the coil end portions 4a and 4b and have an inner circumference with the outer circumferences of the fans 9 and 10 with a required gap, respectively. 16 and 17 are provided respectively. Stator core 2
An exhaust passage 22 which is a ventilation passage for the cooling air discharged from the duct 3 is provided in the upper part of the cooling pipe, which communicates with the intake passages 23, 24 formed between the respective enclosing plates 16, 17 and the inner wall of the frame 15. An air ventilation path is configured. The air coolers 18 and 19 are arranged symmetrically in the exhaust passages 22 above the both ends of the stator core 2 so that the cooling air discharged from the duct 3 passes through the filter device 25.
Are arranged in the exhaust passage 22 between the bottoms of the air coolers 18, 19.

The characteristic configuration of the invention in the first embodiment is that the filter device 25 is arranged in the exhaust passage 22 so that the cooling air discharged from the duct 3 of the stator core 2 passes through. . Specifically, the pre-filter 26 is a known filter that removes dust and the like in the exhaust gas. The chemical adsorbent layer for nitric acid gas in the gas removing agent layer 27 is composed of a known chemical adsorbent having a remarkable effect on adsorption of nitric acid gas. For example, a chemical adsorbent of grade A2 manufactured by Yamato Chemical Co., Ltd. is used. I'm using it. The activated carbon layer for ozone removal is
For example, Yamato Chemical Co., Ltd. grade O2 activated carbon is used, and it is used in combination with a nitric acid gas chemical adsorbent layer in order to remove ozone in particular. The removal agent layer 27 can be formed as a single layer by attaching the chemical adsorbent of the nitric acid gas chemical adsorption agent layer to the activated carbon of the ozone removal activated carbon layer of the gas removal agent layer 27. The removal filter device 25 is detachably attached to the frame 15 (not shown). Here, the ventilation amount slightly decreases due to the increase in ventilation resistance due to the placement of the removal filter device 25 in the ventilation passage in the machine, but if the removal filter is designed in consideration of this point in advance, the temperature of the stator windings will be reduced. The rise is not a problem.

In the totally enclosed internal cooling turbine generator configured as described above, the cooling air sent by the fans 9 and 10 due to the rotation of the rotary shaft 7 is divided into two parts, and one cooling air is rotated into a plurality of parts. A gap (not shown) between the child magnetic poles 6 axially flows as indicated by a dotted arrow A1, and the other cooling air flows through each coil end 4 as indicated by a solid arrow A2.
A and 4b are cooled and flow through the gap 11 in the axial direction to join them. Then, it flows toward the outer periphery in each duct 3 of the stator core 2, passes through the pre-filter 26 and the gas removing agent layer 27 of the filter device 25, and is discharged to the exhaust passage 22.
The cooling air discharged to the exhaust passage 22 is divided into right and left as shown by a solid line arrow A3, and the air cooler 18,
Each intake passage 2 is cooled by 19 and is indicated by a solid arrow A4.
3 and 24, and reach the intake side of each fan 9, 10. Then, it circulates through the same ventilation path.

In the fully-closed internal cooling turbine generator of the first embodiment, since the filter device 25 is provided at the position where the cooling air discharged from the outer periphery of the stator core 2 to the exhaust passage 22 passes, the stator is provided. Even if ozone is generated due to corona discharge in the conductive portion such as the winding 4 or the interphase connecting conductor (not shown), and nitric acid gas is generated, the ozone and nitric acid gas are introduced into the exhaust passage 22, that is, in the stator core 4. On the outer circumference, the filter device 25 removes the rotary electric machine immediately before reaching the other parts. Therefore, the corrosion of the metal structural member in the turbine generator is prevented from progressing.

As described above, in the first embodiment, since the filter device 25 having the removing agent layer 27 for removing the ozone and nitric acid gas generated in the frame 15 is provided, the ozone and nitric acid generated in the frame 15 are provided. The gas can be effectively removed, and the corrosion of each metal structural member by nitric acid gas can be prevented.

Embodiment 2. FIG. 2 is a cross-sectional view showing an air-cooled, fully-enclosed, internally-cooled turbine generator, which is Embodiment 2 of the present invention, in a lateral cross-section. In the drawings, the same reference numerals indicate the same or equivalent parts as those in the first embodiment. The same applies hereinafter. The air-cooled, fully-enclosed, internally-cooled turbine generator according to the second embodiment is provided with one filter device 50 outside the machine instead of the structure in which the filter device 25 is arranged in the exhaust passage 22 inside the machine, and the coil end is provided. An air lead-out hole 30 for leading out a part of the cooling air is provided in the wall of the frame 15 near the back part of the portion 4a, and a part of the cooling air is introduced into the wall of the frame 15 forming the intake passage 24 on the opposite side. The air introduction hole 31 is provided, and the air outlet pipe 4 which is a ventilation member.
At 0, the air lead-out hole 30 and the inlet side of the filter device 50 are connected to each other, and the air introduction pipe 41, which is a ventilation member, connects the air introduction hole 31.
And the outlet side of the filter device 50 are connected.
Other configurations are the same as those in the first embodiment.

More specifically, the filter device 50 includes a container 51.
And a pre-filter 52 arranged on the inlet side of the container 51 and a gas removing agent layer 53 arranged on the outlet side of the container 51. The gas removing agent layer 53 is shown in FIG.
Similar to the gas removing agent layer 27, the nitric acid gas adsorbing chemical adsorbent and the ozone removing activated carbon layer are formed in two layers, or these two layers of materials are mixed to form one layer. In this case, the amount of air introduced so as to pass through the filter device 50 is 0.1 to 0.1% of the total amount of cooling air in the generator in consideration of the influence on the cooling effect of the turbine generator and the filter effect.
The dimensions of each cross section of the container 51, the air outlet hole 30, the air inlet hole 31, the air outlet pipe 40, and the air inlet pipe 41 are determined so as to be 3.0%. This is because if the amount of air introduced into the filter device 50 is too small, it takes a long time to remove the generated ozone and nitric acid gas, and the corrosion of the metal structural member proceeds.

In the second embodiment, as described above, one filter device 50 is provided outside the machine, and the air outlet 30 is provided.
Since a part of the total cooling air amount in the generator passes through the filter device 50 by utilizing the air pressure difference between the air introduction hole 31 and the air introduction hole 31, the stator winding 4 or the interphase connection conductor (not shown). When ozone is generated by corona discharge in a conductive portion such as (d) and nitric acid gas is generated, cooling air containing ozone and nitric acid gas is gradually introduced into the filter device 50. Therefore, despite the simple and inexpensive configuration of the filter device system, ozone and nitric acid gas are adsorbed by the gas removing agent 53 and gradually removed from the cooling air, so that corrosion of metal structural members in the turbine generator is prevented. To be done. Further, since the amount of air introduced so as to pass through the filter device 50 is selected in the range of 0.1 to 3.0% of the total cooling air amount in the generator, the cooling effect of the turbine generator is not impaired. The effect can be obtained.

Embodiment 3. FIG. 3 is a cross-sectional view showing an air-cooled, fully-enclosed, internally-cooled turbine generator, which is Embodiment 3 of the present invention, in a lateral cross-section. The air-cooled, fully-closed, internally-cooled turbine generator according to the third embodiment is configured such that the air guide pipe 40 as an air guide member and the inlet side of the removal filter device 50, and the outlet side of the filter device 50 and the air guide pipe. Same as the configuration in the second embodiment except that an adjusting valve 55, which is an air amount adjusting means for adjusting the amount of air passing through the filter device 50, is provided between the member and the air introducing pipe 41 that is a member. Is.

As described above, in the air-cooled, fully-closed, internally-cooled turbine generator according to the third embodiment, the adjusting valve 55 is attached to the air outlet pipe 40 and the air inlet pipe 41. Even if the same filter device 50 is applied to turbine generators of various sizes having different amounts of cooling air in the generator, the air flowing in the filter device 50 can be adjusted by appropriately adjusting the adjustment valve 55. The amount can be adjusted to the optimum value. Further, when the pre-filter 52 or the gas removing agent layer 53 deteriorates with age and needs to be replaced, it can be easily updated by closing the adjusting valve 55.

Fourth Embodiment Fourth Embodiment FIG. 4 is a cross-sectional view showing an air-cooled, fully-closed, internally-cooled turbine generator according to a fourth embodiment of the present invention in a lateral cross-section. In the air-cooled, fully-closed, internally-cooled turbine generator of the fourth embodiment, the air outlet 30 is provided in the wall of the frame 15 near the back of the coil end portion 4a, and the wall of the frame 15 forming the intake passage 24 is provided. The air introduction hole 31 is provided, and the air introduction pipe 40 connects the air introduction hole 30 and the inlet side of the filter device 50, and the air introduction pipe 41 connects the air introduction hole 31 and the outlet side of the filter device 50. The configuration is different from that of Embodiment 2 in the following points.

That is, one filter device 50 is provided outside the machine, and the coil end portions 4a and 4b on the direct connection side and the opposite direct connection side are provided.
In the vicinity of the back part of the frame 15, the air outlet holes 32, 33 for leading out a part of the total cooling air amount in the generator are provided in the wall of the frame 15, and the frame 15 forming the intake passages 23, 24 on the direct connection side and the anti-direct connection side is formed. Each of the air introduction holes 34, 35 for introducing a part of the total cooling air amount is provided in the wall. Then, the air outlet holes 32 and 33 are connected by an air outlet pipe 42 which is a wind guide member, and the middle portion is connected to one end of a branch pipe 44, and the other end of the branch pipe 44 is connected to the filter device 50. It is connected to the entrance side. Further, the air introducing holes 43, 35 are connected by an air introducing pipe 43 which is a baffle member, and the filter device 5
It is connected to the 0 exit side. Other configurations are the same as those in the first embodiment. The filter device 5
The amount of air introduced so as to pass 0 is the same as in the second embodiment.
As in the case of 0.1 to 0.1% of the total cooling air amount in the generator.
It is selected in the range of 3.0%.

As described above, in the fourth embodiment, the air outlets 32 and 33 are provided in the wall of the frame 15 near the backs of the coil end portions 4a and 4b to form the intake passages 23 and 24. Each of the air introduction holes 34, 35 is provided in the wall of the frame 15 to utilize a difference in air pressure between the air introduction holes 32, 33 and the air introduction holes 34, 35 so that a part of the total cooling air amount in the generator is obtained. Since the gas passes through the filter device 50, in addition to the effects obtained in the second embodiment, corona discharge occurs on either side of each coil end portion 4a, 4b to generate ozone and nitric acid gas. Even if it is done, there is an effect that it can be promptly led to the filter device 50 and removed.

Embodiment 5. FIG. 5 is a cross-sectional view showing an air-cooled, fully-enclosed, internally-cooled turbine generator, which is Embodiment 5 of the present invention, in a lateral cross-section. The air-cooled, fully-enclosed, internally-cooled turbine generator according to the fifth embodiment is provided with adjustment valves 55 for adjusting the air flow rates on the inlet side and the outlet side of the removal filter device 50, respectively.
An orifice 56, which is an air amount adjusting means for adjusting the air amount, is provided in each of the air introducing pipe 43 before and after branching to the air introducing pipe 43 before and after branching to the adjusting valve 55 on the outlet side of the filter device 50. The configuration is the same as that of the fourth embodiment except that the attached points are different.

As described above, in the air-cooled, fully-enclosed, internally-cooled turbine generator of the fifth embodiment, the adjusting valve 55 for adjusting the amount of air is attached to each of the inlet side and the outlet side of the filter device 50. Since the orifice 56 for adjusting the air amount is provided before and after the branch portion of the air outlet pipe 42 and the air inlet pipe 43, the adjustment valve 55 may be finely adjusted after adjusting the air amount to some extent with the orifice 56. In addition to the effect obtained by the fourth embodiment, there is an effect that the amount of air passing through the filter device 50 can be easily adjusted.

Sixth Embodiment In the sixth embodiment, in addition to the configuration of the fifth embodiment, as shown in FIG. 5, a nitric acid gas concentration detection sensor 60 is attached to the outer peripheral end of the stator core 2. The nitric acid gas concentration sensor 60 detects and displays the nitric acid gas concentration at the outer peripheral end of the stator core 2 during operation of the turbine generator, and when the nitric acid gas concentration is less than a specified amount, Adjustment valve 55
Is incorporated into the control circuit of the regulating valve 55 so as to automatically close. In the sixth embodiment, when the nitric acid gas concentration is equal to or lower than the specified value, unnecessary air flow to the filter device 50 is blocked, and the filter life of the filter device 50 can be extended. In addition, although Embodiment 1-5 demonstrated based on the turbine generator, it is not restricted to this,
It may be another rotating electric machine including an induction motor. Further, the outer cover type has been described as a fully closed inner cooled type, but the present invention can be applied to any fully closed type including a fully closed outer fan type. Further, as the ventilation structure, the simple ventilation structure in which the cooling air is sent from the inner circumference to the outer circumference of the stator 1 has been described, but the reverse ventilation structure in which the cooling air is sent from the outer circumference to the inner circumference of the stator 1 and the inner week of the stator 1 are described. Multi-ventilation structure that uses both cooling air from the outside to the outside and cooling air from the outside to the inside, or stator winding 4
The present invention can be similarly applied to an internal cooling ventilation structure in which cooling air is sent to the inside of a winding such as.

[0032]

According to the air-cooled fully-closed rotating electric machine of the present invention, the filter device provided in the cooling air passage has a remover for removing at least one of ozone and nitric acid gas generated in the frame. Even if ozone and nitric acid gas are generated by corona discharge in the stator winding in the frame, they are removed by the filter device.
It is possible to prevent the corrosion of the metal structural member in the rotating electric machine from proceeding.

In the air-cooled fully-closed rotary electric machine according to the present invention, a filter device outside the frame is provided with a remover for removing at least one of ozone and nitric acid gas generated inside the frame, and cooling is carried out by a fan. Since a part of the air is drawn out from the outlet side of the fan and is provided with an air guide member that passes through the filter device, ozone and nitric acid gas are generated by corona discharge in the stator windings in the rotating electric machine. However, it is gradually removed from the cooling air as it passes through the filter device. For this reason, the progress of corrosion of the metal structural member in the rotating electric machine is prevented.

Further, since the air guide member is provided with the air amount adjusting means for adjusting the amount of air passing through the filter device, the same filter device is applied to rotating electric machines of various sizes having different in-machine cooling air amounts. However, the amount of air flowing through the filter device can be adjusted to an optimum value by appropriately adjusting the air amount adjusting means.

Further, a part of the cooling air to be pumped is
Since the coil end portions of both ends of the stator winding are led out from the vicinity of the back portion of one coil end portion and introduced into the intake passage on the other coil end portion side, the air guide member is simple and inexpensive. Can be configured.

Further, a part of the pressure-fed cooling air is
Since it is configured so that it is led out from the vicinity of each back end of the coil end portion at both ends of the stator winding and introduced to the suction side of the fan, corona discharge occurs on either side of each coil end portion, and ozone, nitric acid are generated. Even if gas is generated, it can be promptly led to the filter device and removed.

Further, a part of the pressure-fed cooling air is
Since the range of 0.1 to 3.0% of the total cooling air amount in the rotating electric machine is selected, the cooling effect of the rotating electric machine is not impaired.
Ozone and nitric acid gas generated in the machine can be removed to the filter device.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an air-cooled, fully-enclosed, internally-cooled turbine generator, which is Embodiment 1 of the present invention, in a lateral cross-section.

FIG. 2 is a cross-sectional view showing an air-cooled, fully-enclosed, internally-cooled turbine generator, which is Embodiment 2 of the present invention, in a lateral cross-section.

FIG. 3 is a cross-sectional view showing an air-cooled, fully-enclosed, internally-cooled turbine generator, which is Embodiment 3 of the present invention, in a lateral cross-section.

[Fig. 4] Fig. 4 is a cross-sectional view showing an air-cooled, fully-enclosed, internally-cooled turbine generator, which is Embodiment 4 of the present invention, in a lateral cross-section.

FIG. 5 is a cross-sectional view showing an air-cooled, fully-enclosed, internally-cooled turbine generator, which is Embodiments 5 and 6 of the present invention, in a lateral cross-section.

[Explanation of symbols]

1; Stator 2; Stator core 4; Stator winding 4a,
4b; coil end portion 5; rotor 6; rotor core 9; 10; fan 1
1; Air gap 15; Frame 22; Exhaust path 23, 2
4; Intake passage 25, 50; Filter device 27, 53;
Gas remover layer 40, 42; Air outlet pipe 41, 43;
Air introduction pipe 44; Branch pipe 55; Adjustment valve 56;
Orifice 60: Nitric acid gas concentration detection sensor

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshio Soda             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Yoshito Yamada             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F term (reference) 5H609 BB02 BB04 BB19 PP02 PP05                       PP06 PP07 PP08 PP09 PP10                       PP11 QQ02 QQ09 QQ10 QQ14                       QQ18 RR02 RR22 RR33 RR37                       RR54 RR74 SS01

Claims (6)

[Claims] 1. A stator having a stator winding and a stator core around which the stator winding is wound, a frame surrounding the stator iron core, and a rotor facing the stator iron core through a gap. A rotor having an iron core, a fan provided in the rotor for circulating cooling air to the stator and the rotor in the frame, and ozone and nitric acid generated in the frame provided in a passage of the cooling air. An air-cooled fully enclosed rotating electric machine comprising a filter device having a removing agent for removing at least one of gases. 2. A stator having a stator winding and a stator core around which the stator winding is wound, a frame surrounding the stator core, and a rotor facing the stator core via a gap. A rotor having an iron core and a fan for sending cooling air in the intake passage to the inner circumference of the stator iron core, and cooling air is circulated to the stator and the rotor provided in the rotor in the frame. A fan, a filter device provided outside the frame and having a remover for removing at least one of ozone and nitric acid gas generated in the frame,
And an air-cooled fully-closed rotating electric machine comprising an air guide member for guiding a part of the cooling air pressure-fed by the fan from the outlet side of the fan and passing the filter device. 3. The air-cooled fully-closed rotary electric machine according to claim 2, wherein the air guide member is provided with air amount adjusting means for adjusting the amount of air passing through the filter device. 4. A part of the cooling air sent under pressure is drawn out from the vicinity of the back part of one coil end part of the coil end parts at both ends of the stator winding, and is introduced to the other coil end part side. The air-cooled fully-closed rotary electric machine according to claim 2 or 3, which is configured. 5. A part of the cooling air to be pumped is drawn out from the vicinity of the back part of each coil end part at both ends of the stator winding, and is introduced to the suction side of the fan. The air-cooled fully enclosed rotating electric machine according to claim 2 or 3. 6. The part of the cooling air to be fed under pressure is selected in a range of 0.1 to 3.0% of the total amount of cooling air in the rotating electric machine. The air-cooled fully-closed rotary electric machine according to claim 5.