JP2006074866A - Dynamo-electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a pressure loss by removing an air gap made between the inside of a baffle and the outside of the end ring insulating cylinder of a rotor. <P>SOLUTION: In a gas-cooled dynamo-electric machine which is equipped with a rotor 4 and a stator 1, an air gap baffle 7 where a brush seal 9 with its brush tip in contact with the outside surface of the rotor 4 is attached, is provided, inside the baffle main body 8 which regulates the rate of flow of cooling gas flowing into the circular air gap or flowing out of the circular air gap, at least at one stator end of the circular air gap made between the rotor 4 and the stator 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotating electrical machine such as a generator, and more particularly to a rotating electrical machine having a structure including a cooling gas separation baffle capable of guiding cooling gas in the machine to a specific position.

  A rotating electrical machine such as a generator is configured by concentrically arranging a hollow cylindrical stator and a cylindrical rotor having a diameter slightly smaller than the diameter of the hollow portion of the stator. Electrically conductive bars such as are arranged in the axial direction.

  In such a rotating electrical machine, current is induced in the stator-side bar by exciting the rotor-side electrically conductive bar and then rotating the rotor with a drive source. Since large heat is generated due to loss and the like, it is necessary to cool the inside of the machine.

  Therefore, a cooling air duct is provided in the stator and the rotor in the radial direction, and a cooling gas is sent into the machine by installing a fan or the like to perform forced cooling. In this case, a space existing between the hollow portion of the stator and the outer diameter portion of the rotor, so-called air gap, is also used as the cooling gas passage.

  However, since the cooling gas flowing into the air gap flows in the axial direction, the flow of the cooling gas passing through the cooling ventilation duct provided in the radial direction of the stator or the rotor may be disturbed.

  For this reason, conventionally, a baffle called a baffle is provided on the side of the stator core at the end of the air gap to control the flow direction of the cooling gas from the rotor fan so that optimum cooling can be performed.

  As such a baffle, a donut-shaped thin plate having an inner diameter approximately equal to the outer diameter of the rotor end ring and an outer diameter less than the inner diameter of the end of the stator is generally used, and the cooling gas can be adjusted by adjusting the outer diameter. The amount of flow is controlled.

In addition to this, there is an arcuate baffle having a function of selectively cooling and strengthening a specific portion to enhance cooling of the end of the iron core (for example, Patent Document 1). ).
Japanese Patent Publication No. 5-46184

  However, in the cooling gas separation baffle of the general rotating electric machine described above, the inner diameter of the baffle is conventionally about 10 mm from the end ring outer diameter of the rotor for the purpose of preventing contact / damage with the rotor portion that vibrates at high speed. Because of the large size, voids were generated not only on the outer diameter side but also on the inner side of the baffle.

  For this reason, the branch portion of the cooling gas is generated at the end of the air gap, which not only causes unnecessary ventilation loss, but also due to the difference in the rotor end ring outer diameter, the opening area of the relevant portion and the cooling gas rotation Since the peripheral speeds are different, it has become a factor that makes it difficult to predict the flow control amount by the baffle.

  In addition, the above-described arcuate baffle has a structure that is fixed in a cantilever shape, and there is a problem in the strength over time at the end of the air gap in an environment where the flow velocity exceeds 50 m / s.

  Furthermore, since all the baffles are composed of a hard structure, they can be mounted only after the rotor is assembled in the stator for assembly, and as a result, enter the end of the air gap or slightly inside the end. There was a restriction that it could only be installed at a certain position.

  The present invention has been made in order to solve the above-described problems, and eliminates the gap formed between the inner diameter side of the baffle and the outer diameter of the end ring of the rotor, and can be installed at a place other than the end of the air gap. An object of the present invention is to provide a rotating electrical machine having a possible cooling gas baffle.

  In order to achieve the above object, the present invention constitutes a rotating electrical machine by the following means.

  According to a first aspect of the present invention, in the gas-cooled rotary electric machine including the rotor and the stator, at least one stator end portion of the annular gap formed between the rotor and the stator is connected to the annular gap. A cooling gas separation baffle having a brush seal in which the brush tip contacts the outer surface of the rotor is attached to the inner diameter side of a ring-shaped baffle body that adjusts the flow rate of the cooling gas flowing in or out of the annular gap.

  According to a second aspect of the present invention, in the rotating electrical machine of the first aspect of the present invention, the cooling gas separation baffle attached to at least one stator end of the annular gap is an iron core paragraph formed at the stator end. Mounted on the butt.

  According to a third aspect of the present invention, there is provided a gas-cooled rotary electric machine including a rotor and a stator, wherein the annular gap is formed in an end ring portion of at least one of the annular gaps formed between the rotor and the stator. A cooling gas separation baffle having a brush seal in which the brush tip contacts the inner peripheral surface of the stator end is attached to the outer diameter side of the ring-shaped baffle body that adjusts the flow rate of the cooling gas flowing into or out of the annular gap .

  According to a fourth aspect of the present invention, there is provided a gas-cooled rotary electric machine including a rotor and a stator, and a ring-like shape on the stator core side corresponding to an axial center position of an annular gap formed between the rotor and the stator. A cooling gas separation baffle provided with a brush seal on the inner diameter side of the baffle body is attached.

  According to a fifth aspect of the present invention, there is provided a gas-cooled rotary electric machine including a rotor and a stator, and a ring shape on a rotor iron core side corresponding to an axial center position of an annular gap formed between the rotor and the stator. Install a cooling gas separation baffle with a brush seal on the outer diameter side of the baffle body.

  The invention corresponding to claim 6 includes a rotor and a stator, and has a shunt point where the flow direction of the cooling gas circulating in the machine reverses in the axial direction by a gap formed between the rotor and the stator. In the rotary electric machine, a cooling gas separation baffle provided with a brush seal on the inner diameter side of a ring-shaped baffle body is attached to the stator core side at at least one branch point where the flow direction of the cooling gas is reversed in the axial direction.

  According to a seventh aspect of the present invention, there is provided a gas cooling system comprising a rotor and a stator, and having a flow dividing point in which a flow direction of a cooling gas circulating in the machine is axially reversed by a gap formed between the rotor and the stator. In the rotary electric machine, a cooling gas separation baffle provided with a brush seal on the outer diameter side of the ring-shaped baffle body is attached to the rotor side at at least one branch point where the flow direction of the cooling gas is reversed in the axial direction.

  According to an eighth aspect of the present invention, there is provided a gas-cooled rotary electric machine including a rotor and a stator, and a section in which cooling gas circulating in the machine flows from the inner diameter side to the outer diameter side of the stator. A cooling gas separation baffle provided with a brush seal on the inner diameter side of the ring-shaped baffle main body is attached to the stator core side so as to correspond to the gap formed between the stator and the stator.

  According to a ninth aspect of the present invention, there is provided a gas-cooled rotary electric machine having a section including a rotor and a stator, and a cooling gas circulating in the machine flows from an inner diameter side to an outer diameter side of the stator. A cooling gas separation baffle provided with a brush seal on the outer diameter side of the ring-shaped baffle body is attached to the rotor side so as to correspond to a gap formed between the stator and the stator.

  The invention corresponding to claim 10 includes a rotor and a stator, and has a section in which cooling gas circulating in the machine flows from the inner diameter side to the outer diameter side of the stator and a section in which the cooling gas flows from the outer diameter side to the inner diameter side. In the electric machine, a cooling gas separation baffle provided with a brush seal on the inner diameter side of the ring-shaped baffle body is attached to the stator core side in correspondence with a gap existing between the rotor and the stator in the central portion of each section.

  The invention corresponding to claim 11 includes a rotor and a stator, and has a section in which cooling gas circulating in the machine flows from the inner diameter side to the outer diameter side of the stator and a section in which the cooling gas flows from the outer diameter side to the inner diameter side. In the electric machine, a cooling gas separation baffle provided with a brush seal on the outer diameter side of the ring-shaped baffle body is attached to the rotor side so as to correspond to the gap existing between the rotor and the stator in the central portion of each section.

  The invention corresponding to claim 12 is a gas-cooled rotary electric machine comprising a rotor and a stator, and having an axial fan in the rotor and a ventilation guide for guiding cooling gas to an outer diameter side of the axial fan. A brush seal is provided in correspondence with the clearance between the flow fan and the ventilation duct, and the brush seal is attached to the fan chip side or the ventilation guide side of the axial flow fan.

  According to a thirteenth aspect of the present invention, there is provided a gas-cooled rotary electric machine comprising a rotor and a stator, and having a centrifugal fan and a ventilation guide for guiding a cooling gas to an outer diameter side of the centrifugal fan. A brush seal is provided in correspondence with the clearance between the side plate and the ventilation plate, and the brush seal is attached to the side plate outer diameter side or the ventilation guide side of the centrifugal fan.

  The invention corresponding to claim 14 is the rotating electrical machine according to any one of claims 1 to 13, wherein the brush seal is made of a flame-retardant material.

  The invention corresponding to claim 15 is the rotating electrical machine according to any one of claims 1 to 13, wherein the brush seal is made of a material having low wear resistance.

  According to the present invention, since the cooling gas flowing into the gap (air gap) is reduced by the brush seal that does not cause damage to the equipment even if it contacts the rotor that rotates at high speed, the rapid contraction flow at the air gap inlet portion and the rotor coil The confluence of the cooling gas at the end portion can be avoided, and the pressure loss can be reduced.

  Embodiments of the present invention will be described below with reference to the drawings.

  A first embodiment of the present invention will be described with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes a cylindrical stator. The stator 1 includes a stator core 2 formed by laminating a large number of thin laminated magnetic steel sheets in the axial direction and a plurality of axially formed inner circumferential sides of the stator core 2. It consists of an electrically conductive bar (stator coil) such as copper (not shown) accommodated in each slot, and both end portions of the stator core 2 are formed with a plurality of core step portions 2a, and end plates on the end surfaces thereof 3 is attached.

  Reference numeral 4 denotes a cylindrical rotor arranged concentrically in the hollow portion of the stator 1 and having a minute gap (air gap) with the stator. The rotor 4 includes a rotor core 5 and a circumference of the rotor core 5. It consists of an electrically conductive bar (rotor coil) such as copper (not shown) housed in a plurality of slots formed in the axial direction on the surface side, and a rotor coil end portion is held at both ends of the rotor core 5. A rotor end ring 6 is attached.

  Here, the stator iron core 2 and the rotor iron core 5 are respectively formed with cooling ventilation ducts that pass through in the radial direction with appropriate intervals in the axial direction.

  In the rotary electric machine having such a configuration, a ring-shaped air gap baffle 7 is fixed as a cooling gas separation baffle on the inner peripheral side of the end plate 3 attached to the end face of the stator core 2. As shown in FIG. 2, the air gap baffle 7 has a configuration in which a baffle main body 8 and a seal mechanism (hereinafter simply referred to as a brush seal) 9 using a brush are attached to the inner diameter side thereof.

  In this case, the brush length of the brush seal 9 is adjusted so that the brush tip contacts the outer surface of the rotor end ring 6 of the rotor core 5 as shown in FIG.

  In addition, as the brush material of the brush seal 9, a material having flame retardancy or low wear resistance, or a material having both properties is used.

  With the rotating electric machine having such a configuration, during operation, that is, during rotation of the rotor, the gap between the inner diameter side of the air gap baffle and the rotor end ring 6, which has conventionally been a gap, is sealed by the function of the brush seal 9. .

  Therefore, ventilation loss due to the branch portion of the cooling gas in the air gap baffle portion is eliminated, the prediction of the cooling gas flow rate control is facilitated, and a distribution structure with higher cooling efficiency can be realized.

  In the above-described embodiment, the brush length of the brush seal 9 is set slightly longer than the length from the baffle body 8 and its inner diameter side to the outer surface of the rotor end ring 6 as shown in FIG. You may make it make it contact in the state curved to.

  By adjusting to such a brush length, it is possible to seal even when the gap height on the inner diameter side of the air gap baffle 7 due to vibration in the radial direction of the rotor changes with time.

  In the above embodiment, the air gap baffle 7 is attached to the inner peripheral side of the end plate 3 attached to the end face of the stator core 2, but a plurality of iron cores formed at the end of the stator core 2 as shown in FIG. The air gap baffle 7 may be attached to any position of the stepped portion 2a so that the tip of the brush contacts the outer surface of the rotor core 5 as shown in FIG. 3 or FIG.

  With this configuration, the cooling gas can be guided to the cooling ventilation duct formed in the radial direction at the end of the stator core 2, so that the air volume at the end of the stator core 2 can be selectively set. It can be increased and partial cooling enhancement can be realized.

  A second embodiment of the present invention will be described with reference to FIGS.

  In FIG. 6, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted. Here, different parts are described.

  As shown in FIG. 6, a ring-shaped air gap baffle 10 is fixed as a cooling gas separation baffle on the outer peripheral surface of the rotor end ring 6 holding the rotor coil end. The air gap baffle 10 has a configuration in which a baffle body 11 and a seal mechanism (hereinafter simply referred to as a brush seal) 12 using a brush are attached to the outer diameter side thereof as shown in FIG.

  In this case, the lengths of the baffle body 11 and the brush seal 12 may be arbitrary and are determined by the ventilation cooling design.

  With the rotating electrical machine having such a configuration, during operation, that is, during rotation of the rotor, the brush of the brush seal 12 spreads in the radial direction by centrifugal force, thereby acting as a sealing function, and cooling gas at the end of the air gap It is possible to control the flow rate.

  Further, by adjusting the length of the brush of the brush seal 12, it is possible to maintain the sealing function even when the air gap height due to the vibration in the radial direction of the rotor varies with time.

  Therefore, it is possible to obtain a uniform sealing effect in the circumferential direction that eliminates the influence of gravity, so it is possible to eliminate the ventilation loss due to the branching portion of the cooling gas in the air gap baffle portion, and to easily predict the cooling gas flow rate control, A distribution structure with higher cooling efficiency can be realized.

  A third embodiment of the present invention will be described with reference to FIG.

  FIG. 8 is a cross-sectional view showing a schematic configuration of the upper half of the generator. The same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted. Different parts will be described here.

  In FIG. 8, the axial flow fan 13 attached to the shafts at both ends of the rotor 4 causes the cooling gas in the machine to form an air gap in the axial direction between the rotor and the stator 2 in the rotor core 5 as shown by the arrows in the figure. This cooling gas flows in the radial direction of the rotor core 5 and merges with the cooling gas flowing through the air gap, and then passes through the stator core 2 from the inner diameter side to the outer diameter side. A one-way ventilation method is adopted in which the refrigerant flows into the cooler 15 through the ventilation path formed between the two and the cooling gas, and the cooling gas cooled here returns to the axial flow fan 13 side again.

  In such a ventilation type rotating electrical machine, the cooling gas ventilation path is symmetrical, so that a collision of the cooling gas occurs in the air gap in the center of the generator, resulting in a disturbance in the flow of the cooling gas. Affect the cooling efficiency.

  Therefore, in the present embodiment, the ring-shaped segregating baffle 16 is fixed as a cooling gas separation baffle so as to partition the air gap on the inner diameter side of the axially central portion of the stator core 2.

  The segregating baffle 16 may have the same configuration as shown in FIG. Further, the brush length of the brush seal is adjusted to such an extent that the brush tip contacts the outer surface of the rotor 4, but may be a length that makes a curved contact with the outer surface of the rotor.

  If the rotating electric machine having such a configuration is used, that is, during rotation of the rotor 4, the brush seal function acts on the segregating baffle 16, thereby providing a symmetric position where no partition is conventionally provided. The central portion of the generator in the axial direction can be partitioned.

  Further, by adjusting the brush length, the sealing function can be continued even when the gap height on the inner diameter side of the segregating baffle 16 due to the radial vibration of the rotor 4 changes over time.

  Therefore, by fixing the segregating baffle 16 to the stator core 2 so as to partition the air gap in the central portion of the generator where the cooling gas collision occurs, the cooling gas collision in the air gap is eliminated. Can be distributed evenly to the left and right, and a distribution structure with higher cooling efficiency can be realized.

  In the above embodiment, the segregating baffle 16 is fixed to the inner diameter side of the stator iron core 2 in the axial central portion, but corresponds to the axial central portion position of the stator iron core 2 as shown in FIG. The segregating baffle 16 may be fixed so that the air gap is partitioned from the rotor core 5.

  Even with such a configuration, in addition to obtaining the same operational effects as described above, it is possible to attach to the central portion in the axial direction of the rotor core 5 even when the number of radial air passages on the stator side is an odd number.

  A fourth embodiment of the present invention will be described with reference to FIGS.

  10 to 16 are cross-sectional views showing the schematic configuration of the upper half of the generator. The same parts as those in FIGS. 1 and 8 are denoted by the same reference numerals, and the description thereof is omitted. Different parts will be described here.

  FIG. 10 shows the ventilation path of the cooling gas when the air supply section 17 exists in the stator iron core 2 by arrows. When such a ventilation system is employed, in the air gap existing between the rotor 4 and the stator 1, the cooling gas flowing from the end of the stator core on the left side of the figure and the stator core 2 on the right side of the figure are shown. The flow direction of the cooling gas coming from the air supply section 17 is reversed, and a position where these cooling gases collide occurs.

  In a rotating electrical machine employing such a multi-section ventilation system, a segregating baffle 16 is fixed to the inner diameter side of the stator core 2 as a cooling gas separation baffle so as to partition an air gap adjacent to the position where the cooling gas collides. To do.

  The segregating baffle 16 may have the same configuration as shown in FIG. 2, and the brush length of the brush seal is adjusted to the extent that the brush tip contacts the outer surface of the rotor 4. The length may be such that the surface is curved and contacts.

  Further, FIG. 11 shows a case where an air supply section 17a in which the cooling gas flows from the outer diameter side to the inner diameter side and an exhaust section 17b in which the cooling gas flows from the inner diameter side to the outer diameter side alternately exist in the stator iron core 2. The ventilation path is indicated by arrows. When such a ventilation path is adopted, the cooling gas flowing in from the air supply section 17a adjacent to the exhaust section 17b in the air gap existing between the rotor 4 and the stator 1 is reversed and collides with the air gap. Occurs.

  In the rotating electrical machine to which such a multi-section ventilation system is applied, the segregating baffle 16 is attached to the stator iron core 2 so as to partition the central portion of the exhaust section 17b where the cooling gas collides or the air gap in the vicinity of the central portion. The structure is fixed to the inner diameter side.

  In the rotary electric machine of the above-described multi-section ventilation system, as shown in FIG. 12, the segregating baffle 16 may be fixed to the inner diameter side of the stator core 2 in the air supply section 17a as well as the exhaust section. .

  Further, in the above-described multi-section ventilation type rotating electrical machine, the brush lengths of the brush seals of the segregating baffle 16 may be different from each other as shown in FIG. 13, and as shown in FIG. The pressing amount of the segregating baffle 16 against the outer surface of the rotor 4 by the brush seal may be different, or the brush seal brush diameters may be different as shown in FIG. The number of brush seal brushes may be different from each other as shown in FIG.

  In the case of the rotating electric machine having such a configuration, the air gap that has not been provided with a partition in the past is provided because the brush of the brush seal acts as a sealing function in the segregating baffle 16 during operation, that is, during rotation of the rotor 4. The air gap can be partitioned at the internal diversion position.

  Further, by adjusting the brush length and pressing amount of the brush seal, or the wire diameter and number of brushes, the gap height on the inner diameter side of the segregating baffle 16 due to the radial vibration of the rotor is also divided. In addition, it is possible to adjust the flow rate at the branch position in the air gap.

  As described above, in this embodiment, the segregating baffle 16 is used as shown in FIG. 10, and the position where the flow direction of the cooling gas is predicted to flow from the outer diameter side to the inner diameter side of the stator core 2 in the air gap. Alternatively, by partitioning the position where the cooling gas is forcibly separated, the collision of the cooling gas at the branching position can be eliminated and the flow can be distributed smoothly, and a distribution structure with higher cooling efficiency can be realized.

  Further, by using the segregating baffle 16 in the central portion of the air gap of the exhaust section or the air supply section, the cooling gas can be evenly distributed, so that the temperature of the cooling target portion can be leveled.

  In any of the above embodiments, the segregating baffle 16 is fixed to the inner diameter side of the stator core 2 and the brush tip of the brush seal is brought into contact with the outer surface of the rotor core 5 in any of the configurations shown in FIGS. The gap is partitioned, but conversely, the segregating baffle 16 is fixed to the rotor core 5 side, and the brush tip of the brush seal is brought into contact with the inner diameter side surface of the stator core 5 to partition the air gap. May be.

  Even with such a configuration, the same effects as described above can be obtained.

  A fifth embodiment of the present invention will be described with reference to FIGS.

  FIG. 17 is a side view showing a configuration in the vicinity of an axial fan mounted on both end shaft portions of the rotor of the generator.

  In FIG. 17, an axial flow fan 13 is attached to the shaft portion of the rotor 1, and a ventilation guide 18 is disposed around the axial flow fan 13 so as to face the ventilation path in the machine. In this way, air is supplied and exhausted from the front and rear of the fan partitioned by the ventilation guide 18 so as to correspond to the front end of the fan outer diameter, and is circulated in the machine.

  A brush seal 19 is attached to the front end surface of the outer diameter portion of the axial fan 13. The brush length of the brush seal 19 is adjusted so that the tip of the brush contacts the ventilation guide 18 as shown in FIG. 18, but the outer diameter tip of the axial fan 13 and the ventilation guide surface as shown in FIG. You may make it contact in the state curved longer by the ventilation guide surface longer than the distance between.

  With the rotating electric machine having such a configuration, the brush of the brush seal 19 acts as a sealing function on the front end surface of the outer diameter portion of the axial fan 13 mounted on the rotor 4 during operation, that is, during rotation of the rotor 4. Therefore, the fan chip gap can be eliminated.

  Thus, in this embodiment, since the brush seal 19 is attached to the front end surface of the outer diameter portion of the axial fan 13 mounted on the rotor 4, it is possible to reduce the pressure loss in the fan chip gap and the rotation. The cooling efficiency of the electric machine can be improved.

  In the above description, the brush seal 19 is attached to the front end surface of the outer diameter portion of the axial fan 13. However, as shown in FIG. 20, the brush seal 19 may be attached to a position where the fan of the ventilation guide 18 is mounted.

  With such a configuration, it becomes possible to install the seal portion all around the fan installation position, and pressure loss can be further reduced.

  A sixth embodiment of the present invention will be described with reference to FIGS.

  FIG. 21 is a cross-sectional view showing the configuration near the centrifugal fan mounted on the rotor of the generator.

  In FIG. 21, reference numeral 21 denotes a cylindrical stator. This stator 21 includes a stator core 22 formed by laminating a large number of thin laminated magnetic steel plates in the axial direction, and a plurality of axially formed inner circumferential sides of the stator core 22. The stator cores 22 are respectively mounted in the slots, and the stator cores 22 are attached to the frame 24 by forming an axial ventilation path at the back thereof.

  Reference numeral 25 denotes a cylindrical rotor arranged concentrically in the hollow portion of the stator 21 and having a minute gap (air gap) with the stator. The rotor 25 is composed of a rotor core 26 and a circumference of the rotor core 26. The rotor coil 27 is housed in a plurality of slots formed in the axial direction on the surface side, and a rotor end ring insulating cylinder 28 that holds the rotor coil end portion is attached to both ends of the rotor core 26. .

  Further, a centrifugal fan 29 is attached to both end shafts of the rotor 25, and an air guide plate 30 supported by the frame 24 is provided in the rear part near the centrifugal fan 29.

  Therefore, the cooling gas forms a ventilation path as shown by the arrows in the figure before and after the centrifugal fan 29 by the rotation of the centrifugal fan 29.

  Here, the stator iron core 22 and the rotor iron core 26 are respectively formed with cooling ventilation ducts that pass through in the radial direction with appropriate intervals in the axial direction.

  In the generator having such a configuration, the brush seal 31 is attached to the distal end surface of the outer diameter portion of the side plate 29a of the centrifugal fan 29. The brush length of the brush seal 31 is adjusted so as to contact the air guide plate 30 as shown in FIG. 22, but as shown in FIG. 23, the side plate outer diameter front end surface of the centrifugal fan 29 and the air guide plate 30. You may make it contact in the state bent longer than the distance between these plate surfaces, and the baffle plate surface.

  With the rotating electric machine having such a configuration, during operation, that is, during rotation, the brush of the brush seal 31 acts as a sealing function on the outer diameter end surface of the side plate 29a of the centrifugal fan 29 mounted on the rotor 25. The fan chip gap can be eliminated.

  Therefore, it becomes possible to reduce the pressure loss in the fan chip gap and optimize the ventilation path, and to improve the cooling efficiency of the rotating electrical machine.

  In the above embodiment, the brush seal 31 is attached to the distal end surface of the side plate outer diameter portion of the centrifugal fan 29. However, as shown in FIG. 24, the brush seal 31 faces the side plate of the centrifugal fan 29 of the air guide plate 30. You may make it attach to.

  Even with such a configuration, in addition to obtaining the same operational effects as described above, the entire circumference of the fan installation position can be used as a seal portion, and pressure loss can be further reduced.

  In the first to sixth embodiments, the brush material of the brush seals 9, 12, 18, and 31 is made of flame-retardant material, so that even if a spark occurs for some reason in the machine, it is easily burned out. Therefore, the distribution structure with high cooling efficiency can be continued without greatly losing the sealing function.

  Further, by making the brush seal 9, 12, 18, 31 a brush material with low wear resistance, the brush length is worn in accordance with the rotation trajectory of the rotor during rotation, and gradually becomes an appropriate length. Therefore, the design of the brush length can be facilitated.

Sectional drawing which shows the structure of the air gap edge part periphery of the generator in the 1st Embodiment of this invention. The block diagram which shows a part of air gap baffle in the embodiment. The block diagram for demonstrating the brush length of the brush seal which contacts a rotor end ring in the embodiment. The block diagram which shows the other example for demonstrating the brush length of the brush seal which contacts a rotor end ring in the embodiment. Sectional drawing which shows the structure of the air gap edge part periphery which attached the air gap baffle to the stator core side in the same embodiment. Sectional drawing which shows the structure of the air gap edge part periphery of the generator in the 2nd Embodiment of this invention. The block diagram which shows a part of air gap baffle in the embodiment. Sectional drawing of the upper half part of the generator which shows the 3rd Embodiment of this invention. Sectional drawing which shows the other structural example of the embodiment. Sectional drawing of the upper half part of the generator which shows the 4th Embodiment of this invention. Sectional drawing of the upper half part of the generator which shows the 1st example of application of the embodiment. Sectional drawing of the upper half part of the generator which shows the 2nd application example of the embodiment. Sectional drawing of the upper half part of the generator which shows the 3rd application example of the embodiment. Sectional drawing of the upper half part of the generator which shows the 4th application example of the embodiment. Sectional drawing of the upper half part of the generator which shows the 5th example of application of the embodiment. Sectional drawing of the upper half part of the generator which shows the 6th application example of the embodiment. The side view which shows the structure of the axial flow fan vicinity mounted in the both-ends axial part of the rotor of a generator as the 5th Embodiment of this invention. The block diagram for demonstrating the brush length of the bra seal attached to the axial fan in the embodiment. The block diagram which shows the other example for demonstrating the brush length of the bra seal attached to the axial flow fan in the embodiment. The block diagram which shows the state which attached the brush seal to the ventilation guide side in the same embodiment. Sectional drawing which shows the structure of the centrifugal fan vicinity mounted on the rotor of the generator as the 6th Embodiment of this invention. The block diagram for demonstrating the brush length of the brush seal attached to the centrifugal fan in the embodiment. The block diagram which shows the other example for demonstrating the brush length of the brush seal attached to the centrifugal fan in the embodiment. The block diagram which shows the state which attached the brush seal to the wind guide position corresponding to a centrifugal fan in the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Stator, 2 ... Stator iron core, 2a ... Paragraph 3 ... End plate, 4 ... Rotor, 5 ... Rotor iron core, 6 ... Rotor end ring, 7, 10 ... Air gap baffle, 8, 11 ... Baffle main body, 9 , 12, 19 ... brush seal, 13 ... axial fan, 14 ... frame, 15 ... cooler, 16 ... segregating baffle, 17, 17a ... air supply section, 17b ... exhaust section, 18 ... ventilation guide, 21 ... Stator, 22 ... stator core, 23 ... stator coil, 24 ... frame, 25 ... rotor, 26 ... rotor core, 27 ... rotor coil, 28 ... end ring, 29 ... centrifugal fan, 30 ... air guide plate, 31 ... brush seal .

Claims (15)

  In a gas-cooled rotary electric machine including a rotor and a stator, at least one stator end portion of an annular gap formed between the rotor and the stator flows into the annular gap or flows out of the annular gap. A rotating electrical machine comprising a cooling gas separation baffle provided with a brush seal whose brush tip contacts the outer surface of the rotor on the inner diameter side of a ring-shaped baffle main body for adjusting a cooling gas flow rate.   2. The rotating electrical machine according to claim 1, wherein the cooling gas separation baffle attached to at least one stator end of the annular gap is attached to an iron core step formed at the stator end. .   In a gas-cooled rotary electric machine including a rotor and a stator, an annular gap formed between the rotor and the stator enters at least one end ring portion of the rotor into the annular gap or from the annular gap. A rotating electrical machine comprising a cooling gas separation baffle provided with a brush seal whose brush tip contacts the inner peripheral surface of the stator end on the outer diameter side of a ring-shaped baffle body that adjusts the flow rate of cooling gas flowing out.   In a gas-cooled rotating electrical machine including a rotor and a stator, a brush seal is provided on the inner diameter side of a ring-shaped baffle body on the stator core side corresponding to the axial center position of an annular gap formed between the rotor and the stator. A rotating electrical machine having a cooling gas separation baffle provided with   In a gas-cooled rotating electrical machine including a rotor and a stator, a brush is provided on the outer diameter side of the ring-shaped baffle body on the rotor core side corresponding to the axial center position of the annular gap formed between the rotor and the stator. A rotating electrical machine having a cooling gas separation baffle provided with a seal.   In a gas-cooled rotary electric machine comprising a rotor and a stator and having a branch point where the flow direction of the cooling gas circulating in the machine reverses in the axial direction at a gap formed between the rotor and the stator. A rotating electrical machine characterized in that a cooling gas separation baffle provided with a brush seal on the inner diameter side of a ring-shaped baffle body is attached to the stator core side at at least one branch point where the flow direction is reversed in the axial direction.   In a gas-cooled rotary electric machine comprising a rotor and a stator and having a branch point where the flow direction of the cooling gas circulating in the machine reverses in the axial direction at a gap formed between the rotor and the stator. A rotating electrical machine, wherein a cooling gas separation baffle having a brush seal provided on the outer diameter side of a ring-shaped baffle body is attached to a rotor side at at least one branch point where the flow direction is reversed in the axial direction.   A gas-cooled rotating electrical machine having a rotor and a stator and having a section in which cooling gas circulating in the machine flows from the inner diameter side to the outer diameter side of the stator is formed between the rotor and the stator in the central portion of the section. A rotating electrical machine, wherein a cooling gas separation baffle provided with a brush seal on the inner diameter side of a ring-shaped baffle body corresponding to the gap is attached to the stator core side.   A gas-cooled rotating electrical machine having a rotor and a stator and having a section in which cooling gas circulating in the machine flows from the inner diameter side to the outer diameter side of the stator is formed between the rotor and the stator in the central portion of the section. A rotating electrical machine, wherein a cooling gas separation baffle provided with a brush seal on the outer diameter side of a ring-shaped baffle body corresponding to the gap is attached to the rotor side.   A gas-cooled rotating electrical machine comprising a rotor and a stator, and having a section in which cooling gas circulating in the machine flows from the inner diameter side to the outer diameter side of the stator and a section from the outer diameter side to the inner diameter side. A rotating electric machine characterized in that a cooling gas separation baffle provided with a brush seal on the inner diameter side of a ring-shaped baffle body corresponding to a gap existing between the rotor and the stator is attached to the stator core side.   A gas-cooled rotating electrical machine having a rotor and a stator and having a section in which cooling gas circulating in the machine flows from the inner diameter side to the outer diameter side of the stator and a section from the outer diameter side to the inner diameter side. A rotating electric machine, wherein a cooling gas separation baffle provided with a brush seal on the outer diameter side of a ring-shaped baffle body corresponding to a gap existing between the rotor and the stator is attached to the rotor side.   A clearance between the axial fan and the ventilation duct in a gas-cooled rotary electric machine comprising a rotor and a stator, and having an axial fan in the rotor and a ventilation guide for guiding a cooling gas to an outer diameter side of the axial fan. A rotating electrical machine characterized in that a brush seal is provided in correspondence with the portion, and the brush seal is attached to the fan chip side or the ventilation guide side of the axial flow fan.   In a gas-cooled rotary electric machine comprising a rotor and a stator, and having a centrifugal fan in the rotor and a ventilation guide for guiding cooling gas to the outer diameter side of the centrifugal fan, a clearance portion between the side plate of the centrifugal fan and the ventilation plate A rotating electrical machine characterized in that a brush seal is provided corresponding to the above, and the brush seal is attached to the side plate outer diameter side or the ventilation guide side of the centrifugal fan.   The rotating electrical machine according to any one of claims 1 to 13, wherein the brush seal is made of a flame-retardant material.   14. The rotating electrical machine according to claim 1, wherein the brush seal is made of a material having low wear resistance.

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