Rotary machine

Abstract

To provide a rotary machine having a simplified construction of the rotary machine, when the rotary machine is constructed by including a feeding device of cooling medium and a feeding device of lubricant.SOLUTION: A rotary machine has a first rotary shaft 204 and a second rotary shaft 16. The first rotary shaft 204 has a coolant passage 240, a liquid supply passage 250, and a first engaging part 260 provided in a first connection end part 218. In a second connection end part 322 of the second rotary shaft 16, a second engaging part 324 is provided. In a diameter direction of the first connection end part 218, the first connection end part 218 and the second connection end part 322 are overlapped, and the second engaging part 324 is slidably engaged with the first engaging part 260. A lubricant passage 262 is formed between the first engaging part 260 and the second engaging part 324.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a rotary machine including a first rotating body and a second rotating body. [Background technology]

[0002] A rotating electric machine rotor has a rotating shaft and permanent magnets held by the rotating shaft. In a rotating electric machine, the permanent magnets become hot as the rotating electric machine rotor rotates. Therefore, Patent Document 1 proposes supplying a cooling medium into the hollow interior of the rotating shaft to cool the permanent magnets.

[0003] A rotating machine may be configured as a hybrid power system by combining a rotating electric machine and a gas turbine engine. In the hybrid power system, one end of the rotating shaft of the rotating electric machine rotor is connected to one end of the rotating shaft of the turbine rotor in the axial direction. Therefore, the rotating electric machine rotor and the turbine rotor rotate integrally. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-45542 Summary of the Invention [Problem to be solved by the invention]

[0005] There may be cases where lubrication is required at the connection point between the rotating shaft of the rotating electric machine rotor and the rotating shaft (output shaft) of the turbine rotor. Therefore, when a rotating machine is constructed by combining the rotating electric machine having the configuration described in Patent Document 1 with a gas turbine engine, it is necessary to supply a lubricant to the connection point between the two rotating shafts while supplying a coolant to the rotating shaft of the rotating electric machine rotor. Therefore, when the rotating machine is constructed by including a coolant supply device and a lubricant supply device, the configuration of the rotating machine becomes complicated.

[0006] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0007] An aspect of the present disclosure is a rotary machine including a first rotating body including a first rotating shaft and a second rotating body including a second rotating shaft that rotates integrally with the first rotating shaft. The first rotating shaft has a refrigerant flow path through which a liquid refrigerant flows, a liquid feed path that communicates with the refrigerant flow path, and a first engagement portion provided at a first connecting end that is one end of the first rotating shaft in the axial direction. The second rotating shaft has a second connecting end that overlaps the first connecting end in the diameter direction of the first connecting end, and a second engagement portion provided at the second connecting end. The first engagement portion and the second engagement portion are connecting portions that transmit rotational driving force between the first rotating shaft and the second rotating shaft.

[0008] The second engagement portion engages with the first engagement portion so as to be slidable relative to the first engagement portion along the axial direction. A lubricant flow path is formed between the first engagement portion and the second engagement portion, which are engaged with each other, and communicates with the liquid feed path, allowing the liquid refrigerant to pass through as a lubricant. The liquid feed path is interposed between the refrigerant flow path and the lubricant flow path. [Effects of the Invention]

[0009] According to the present invention, the liquid refrigerant for cooling the first rotating body can be used as a lubricant for lubricating the connecting portion between the first rotating shaft and the second rotating shaft. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic overall perspective view of a rotary machine (compound power system) according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic cross-sectional side view of the combined power system of FIG. 1 as viewed in a direction perpendicular to the axial direction. [Figure 3]3 is an enlarged side cross-sectional view of a main portion showing the vicinity of a connection point between a first rotating shaft and a second rotating shaft (connecting shaft) in the compound power system of FIG. [Figure 4] FIG. 4 is a schematic side cross-sectional view showing a refrigerant flow path in an embodiment different from that shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] In the following, the rotating machine 10 will be exemplified by the combined power system 100 shown in Fig. 1. In this case, the rotating electric machine rotor 202 shown in Fig. 2 corresponds to the first rotating body 12, and the turbine rotor 300 corresponds to the second rotating body 14. However, this is merely an example, and the rotating machine 10 is not limited to the combined power system 100. Although not shown, another example of the rotating machine 10 is a rotor. In this case, the rotating electric machine rotor 202 corresponds to the first rotating body 12, and a propeller or a fan corresponds to the second rotating body 14.

[0012] In the following, cooling oil CO is exemplified as the liquid refrigerant RF. However, the liquid refrigerant RF is not limited to cooling oil CO. The liquid refrigerant RF may be an organic solvent with a high boiling point and low volatility.

[0013] Furthermore, in the following description, "left," "right," "down," and "up" refer to the left, right, down, and up directions in FIGS. 2 to 4, respectively. However, these directions are merely used for convenience to simplify the description and make it easier to understand. In other words, the directions described in the specification are not necessarily the directions when the combined power system 100 is actually used.

[0014] 1 is a schematic overall perspective view of a combined power system 100, which is an example of a rotating machine 10. The combined power system 100 includes a rotating electric machine system 20 and a gas turbine engine 30. The axis of the rotating electric machine system 20 coincides with the axis of the gas turbine engine 30. In other words, the rotating electric machine system 20 and the gas turbine engine 30 are arranged side by side on the same axis.

[0015] The combined power system 100 is used as a propulsion power source in, for example, an air vehicle, a ship, or an automobile. Suitable examples of the air vehicle include a drone or a multicopters. When mounted on an air vehicle, the combined power system 100 is used as a power drive source for rotating, for example, a propeller or a ducted fan. When mounted on a ship, the combined power system 100 is used as a rotational force generator for a screw. When mounted on an automobile, the combined power system 100 is used as a power drive source for rotating a motor.

[0016] The combined power system 100 can also be used as a power source for auxiliary power supplies in aircraft, ships, buildings, etc. In addition, the combined power system 100 can also be used as a gas turbine power generation facility.

[0017] The rotating electric machine system 20 will now be described. As shown in Fig. 2, the rotating electric machine system 20 includes a rotating electric machine 200 and a rotating electric machine housing 272 that houses the rotating electric machine 200. The rotating electric machine housing 272 has a substantially cylindrical main housing 274 that is open on both the left and right ends. The rotating electric machine housing 272 further includes a first sub-housing 276 connected to the left end of the main housing 274, and a second sub-housing 278 connected to the right end of the main housing 274.

[0018] The rotating electric machine 200 includes a rotating electric machine rotor 202 and a stator 268 that surrounds the outer periphery of the rotating electric machine rotor 202. In the combined power system 100, the rotating electric machine 200 is typically a generator. In the above-described rotor blades, the rotating electric machine 200 is typically a motor. In this way, the rotating electric machine 200 can function as a generator or a motor.

[0019] The rotating electric machine rotor 202 has a first rotating shaft 204. The first rotating shaft 204 has a large diameter portion 206, a first end 208 located to the left of the large diameter portion 206, and a second end 214 located to the right of the large diameter portion 206. The large diameter portion 206 is the portion of the first rotating shaft 204 with the largest outer diameter. The first end 208 has a medium diameter portion 210 connected to the left of the large diameter portion 206 and a small diameter portion 212 connected to the left of the medium diameter portion 210. The medium diameter portion 210 is rotatably supported by the first bearing 120. The small diameter portion 212 is located to the left of the first bearing 120 and extends into the first sub-housing 276. The outer diameter of the second end 214 is approximately equal to the outer diameter of the medium diameter portion 210.

[0020] A resolver rotor 130 is attached to the small diameter portion 212. The resolver rotor 130 rotates integrally with the first rotating shaft 204. A resolver holder 128 is attached to the first sub-housing 276. A resolver stator 132 is held in the resolver holder 128. The resolver rotor 130 and the resolver stator 132 form a resolver 134. The resolver 134 detects, for example, the rotation angle of the first rotating shaft 204.

[0021] The large diameter portion 206 is hollow and has an inner hole 216. A cover member 230 is positioned and fixed in the large diameter portion 206. In the illustrated example, the cover member 230 is a sleeve 232. A first collar 220 and a second collar 222 are positioned and fixed to the left and right ends of the sleeve 232, respectively. A magnet holder 234 is sandwiched between the first collar 220 and the second collar 222. The sleeve 232 is located inward of the magnet holder 234 in the radial direction of the rotating electric machine rotor 202, and covers the large diameter portion 206 of the first rotating shaft 204. It is also possible to cover the large diameter portion 206 with a thick magnet holder 234 without providing the sleeve 232. In this case, the magnet holder 234 corresponds to the cover member 230.

[0022] A plurality of permanent magnets 236 are held on the outer peripheral surface of the magnet holder 234. The sleeve 232 which is the cover member 230, the magnet holder 234, and the plurality of permanent magnets 236, together with the first rotating shaft 204, constitute the rotary electric machine rotor 202.

[0023] The second end 214 is rotatably supported by the second bearing 122. The second end 214 includes a first connecting end 218. The first connecting end 218 is one end of the first rotating shaft 204 in the axial direction. The first connecting end 218 will be described later. The second end 214 is hollow.

[0024] The first rotating shaft 204 has a refrigerant flow path 240 through which the cooling oil CO flows, and a liquid supply path 250. In the illustrated example, the refrigerant flow path 240 has a first flow path 242, a communicating path 244, a second flow path 246, and a relay path 248. The first flow path 242 extends along the axial direction of the first rotating shaft 204, for example, at the diametric center of the first end 208. One end (left end) of the first flow path 242 in the axial direction opens at the tip surface of the first end 208. The other end (right end) of the first flow path 242 in the axial direction extends to the large diameter portion 206 and communicates with the communicating path 244.

[0025] Second flow path 246 is formed by covering outer groove 247 with sleeve 232. Specifically, outer groove 247 is formed as a spiral groove 247a on the outer peripheral surface of large diameter portion 206. As spiral groove 247a is covered with sleeve 232, second flow path 246 in a spiral shape is formed between large diameter portion 206 and sleeve 232.

[0026] The second flow path 246 is not limited to a spiral flow path. As shown in Fig. 4, the outer groove 247 may be a linear groove 247b that extends linearly along the axial direction of the first rotating shaft 204. In this case, the second flow path 246 is a flow path that extends linearly along the axial direction of the first rotating shaft 204. Although one linear groove 247b is shown in Fig. 4, there may be a plurality of linear grooves 247b.

[0027] The communicating passages 244 extend from the inside in the diameter direction of the first rotating shaft 204 toward the outer circumferential surface in the large diameter portion 206, and communicate between the first flow passage 242 and the second flow passage 246. In the illustrated example, the first rotating shaft 204 has a plurality of communicating passages 244. The plurality of communicating passages 244 are hole-shaped and extend radially from the center toward the outer circumferential surface along the diameter direction of the large diameter portion 206. The communicating passages 244 and the inner hole 216 are not directly connected.

[0028] The relay passage 248 extends from the inside in the diameter direction of the first rotating shaft 204 toward the outer circumferential surface in the large diameter portion 206, and connects the second flow path 246 and the liquid feed passage 250. In the illustrated example, the first rotating shaft 204 has a plurality of relay passages 248. The plurality of relay passages 248 are hole-shaped and extend radially from the center toward the outer circumferential surface along the diameter direction of the large diameter portion 206. The inner hole 216 and the liquid feed passage 250 are separated by the relay passage 248.

[0029] The liquid transfer path 250 is a space formed inside the large diameter portion 206, and is continuous with the right part of the inner hole 216. The liquid transfer path 250 extends along the axial direction of the first rotating shaft 204 toward the second end 214. One end (right end) of the liquid transfer path 250 in the axial direction is located at the second end 214. The inner diameter of the liquid transfer path 250 gradually increases from the relay path 248 toward the first connecting end 218. In other words, the inner circumferential surface 250a of the liquid transfer path 250 is a tapered surface whose diameter decreases from the first connecting end 218 toward the relay path 248.

[0030] The internal space of the first connecting end 218 is connected to the right part of the liquid supply path 250. A first engagement portion 260 is provided on the inner circumferential surface of the first connecting end 218. A second connecting end 322 constituting the second rotating shaft 16 of the turbine rotor 300 is inserted into the internal space of the first connecting end 218. In the illustrated example, the second rotating shaft 16 is a connecting shaft 320 interposed between the first rotating shaft 204 and an output shaft 330 of the gas turbine engine 30, and one end (right end) in the axial direction of the connecting shaft 320 is the second connecting end 322. Alternatively, the output shaft 330 may be connected to the first rotating shaft 204. In this case, the output shaft 330 corresponds to the second rotating shaft 16, and one end (left end) in the axial direction of the output shaft 330 corresponds to the second connecting end 322.

[0031] A second engagement portion 324 is provided on the outer circumferential surface of the second connecting end portion 322. The first rotating shaft 204 and the connecting shaft 320 are connected to each other by engaging the second engagement portion 324 with the first engagement portion 260. In the illustrated example, the second engagement portion 324 overlaps the inside of the first engagement portion 260 in the diameter direction of the first connecting end portion 218. The first engagement portion 260 and the second engagement portion 324 form a connecting portion 400 that transmits rotational driving force between the first rotating shaft 204 and the connecting shaft 320.

[0032] The engagement between the first engagement portion 260 and the second engagement portion 324 is, for example, a spline connection 402. In this case, the second engagement portion 324 is slidable relative to the first engagement portion 260 along the axial direction of the first rotating shaft 204. Note that, as long as the second engagement portion 324 is slidable relative to the first engagement portion 260 along the axial direction, the engagement between the first engagement portion 260 and the second engagement portion 324 may be an engagement other than the spline connection 402.

[0033] A lubricant flow path 262 is formed between the first engagement portion 260 and the second engagement portion 324, which overlap each other in the diametric direction. As can be seen from this, the lubricant flow path 262 is a gap formed between the inner circumferential surface of the first connecting end portion 218 and the outer circumferential surface of the second connecting end portion 322, communicates with the liquid feed path 250, and extends along the axial direction of the first rotating shaft 204. Cooling oil CO passes through the lubricant flow path 262 as a lubricant.

[0034] Contrary to the illustrated example, the second connecting end 322 may be hollow and the first connecting end 218 may be inserted into the second connecting end 322. In this case, the first engaging portion 260 is formed on the outer circumferential surface of the first connecting end 218, and the second engaging portion 324 is formed on the inner circumferential surface of the second connecting end 322. The second engaging portion 324 overlaps the outward side of the first engaging portion 260 in the diameter direction of the first connecting end 218. The lubricant flow path 262 is formed between the outer circumferential surface of the first connecting end 218 and the inner circumferential surface of the second connecting end 322.

[0035] In this embodiment, a mode will be described in which the cooling oil CO flows through the refrigerant flow path 240, the liquid feed path 250, and the lubricant flow path 262 in this order. The rotating electrical machine system 20 includes a refrigerant supply unit 150 for supplying the cooling oil CO to the refrigerant flow path 240. The refrigerant supply unit 150 includes a refrigerant recovery tank 152, a refrigerant supply device 154, and an oil discharge member 156. The refrigerant supply device 154 is, for example, a pump, and pressure-feeds the cooling oil CO toward the refrigerant flow path 240. The oil discharge member 156 is inserted into the internal space of the resolver holder 128. The oil discharge member 156 includes a nozzle portion 158 facing the first flow path 242.

[0036] The storage chamber 280 of the main housing 274 is divided into a rotor chamber 282 and a stator chamber 284 by a cylindrical partition member 160. Most of the rotating electric machine rotor 202 is housed in the rotor chamber 282. The stator chamber 284 houses a stator 268 that constitutes the rotating electric machine 200. The stator 268 has an electromagnetic coil 270. The electromagnetic coil 270 has a U-phase coil, a V-phase coil, and a W-phase coil. When the rotating electric machine 200 is a generator, the rotating electric machine 200 is a so-called three-phase power supply.

[0037] 1, a terminal casing 279 is integrally provided on a side wall near the left end of the main housing 274. The terminal casing 279 houses a U-phase terminal 271a, a V-phase terminal 271b, and a W-phase terminal 271c that are electrically connected to the ends of the U-phase coil, V-phase coil, and W-phase coil, respectively.

[0038] The main housing 274 has a generally cylindrical shape. The left open end of the main housing 274 is closed by a first sub-housing 276. The circular opening at the left end of the first sub-housing 276 is closed by a resolver holder 128.

[0039] The main housing 274 has a recess 286 on the right side. As shown in Figure 3, the recess 286 is closed by the second sub-housing 278 to form an internal chamber. A drain path 292 formed in the main housing 274 communicates with the recess 286.

[0040] The second sub-housing 278 has a flow straightening portion 294 on its right end facing the gas turbine engine 30. The flow straightening portion 294 has a generally frusto-conical shape, and its diameter gradually decreases from the main housing 274 toward the gas turbine engine 30. The flow straightening portion 294 has an insertion hole 296 at its diametric center. The output shaft 330 passes through the insertion hole 296. The left end of the output shaft 330 is rotatably supported by a third bearing 124 provided inside the second sub-housing 278.

[0041] The rotating electrical machine system 20 is basically configured as described above. The configuration of the gas turbine engine 30 is similar to the configuration shown in Fig. 8 of Japanese Patent Application Laid-Open No. 2022-157784, for example. Therefore, only an outline of the gas turbine engine 30 will be described.

[0042] As shown in Figure 1, the gas turbine engine 30 includes an engine housing 302. A turbine rotor 300 (see Figure 2) is housed inside the engine housing 302. The engine housing 302 includes an inner housing 304 (see Figure 1) and an outer housing 306. The inner housing 304 faces the second sub-housing 278 of the rotating electric machine system 20. The outer housing 306 is connected to the inner housing 304.

[0043] The inner housing 304 has a plurality of legs 308. An intake space 310 is formed between adjacent ones of the plurality of legs 308. A combustor (not shown) is provided inside the outer housing 306.

[0044] The turbine rotor 300 of the gas turbine engine 30 includes a connecting shaft 320 serving as the second rotating shaft 16, and an output shaft 330. As shown in Figures 2 and 3, the output shaft 330 is connected to the first rotating shaft 204 via the connecting shaft 320. The right end of the connecting shaft 320 and the left end of the output shaft 330 are connected to each other via a spline coupling 404, for example.

[0045] The output shaft 330 holds a compressor wheel (not shown) and a turbine wheel (not shown). The compressor wheel and the turbine wheel can rotate integrally with the first rotary shaft 204, the connecting shaft 320, and the output shaft 330.

[0046] The operation of the combined power system 100 will now be described.

[0047] First, an alternating current is supplied to the electromagnetic coils 270 (U-phase coil, V-phase coil, and W-phase coil) via the U-phase terminal 271a, V-phase terminal 271b, and W-phase terminal 271c shown in Fig. 2. As a result, the rotating electric machine rotor 202 starts to rotate. Alternatively, the rotating electric machine rotor 202 may be rotated by a known starter (not shown).

[0048] The rotational driving force of the first rotating shaft 204 is transmitted to the output shaft 330 via the connecting shaft 320. Therefore, the turbine rotor 300 rotates integrally with the rotating electric machine rotor 202. That is, a compressor wheel (not shown) and a turbine wheel (not shown) held by the output shaft 330 rotate integrally with the output shaft 330. After the turbine rotor 300 starts to rotate in this manner, the turbine rotor 300 continues to rotate as the gas turbine engine 30 operates. Therefore, even if the supply of current to the electromagnetic coil 270 is stopped, the rotating electric machine rotor 202 rotates integrally with the turbine rotor 300.

[0049] While the rotating electrical machine rotor 202 and the turbine rotor 300 are being rotated in the above manner, the refrigerant supply device 154 is started. The refrigerant supply device 154 pumps and feeds the cooling oil CO toward the refrigerant flow path 240.

[0050] As the rotating electric machine rotor 202 rotates, an AC current is generated in the electromagnetic coil 270 surrounding the permanent magnet 236. The AC current is supplied to an external load via the U-phase terminal 271a, the V-phase terminal 271b, and the W-phase terminal 271c. The AC current may be converted to a DC current by a current converter (not shown), and then the DC current may be supplied to the external load.

[0051] As the turbine rotor 300 rotates, atmospheric air is drawn into the inner housing 304 shown in FIG. 1 through the air intake space 310 between adjacent legs 308. The atmospheric air flows toward the inner housing 304 along the airflow straightening portion 294 shown in FIGS. 2 and 3 and enters the interior of the inner housing 304. Within the inner housing 304, the atmospheric air is compressed by the compressor wheel, thereby generating compressed air. Within the outer housing 306, fuel injected into the compressed air is combusted.

[0052] A portion of the compressed air obtained by the compressor wheel may be supplied to the rotor chamber 282 (see FIG. 2) to cool the rotary electric machine rotor 202. Alternatively, a portion of the compressed air may be used to cool the first bearing 120 and the second bearing 122. Furthermore, a portion of the compressed air or liquid refrigerant RF may be supplied to the stator chamber 284 to cool the stator 268. A portion of the lubricating oil supplied to the first bearing 120, the second bearing 122, and the third bearing 124 may be used as the liquid refrigerant RF. A portion of the lubricating oil may be supplied to the refrigerant flow path 240 as cooling oil CO.

[0053] The electromagnetic coil 270 generates heat as current flows through it, and therefore the permanent magnet 236 facing the electromagnetic coil 270 is exposed to radiant heat.

[0054] As described above, the refrigerant supply device 154 supplies the cooling oil CO toward the refrigerant flow path 240. The cooling oil CO is discharged from the nozzle portion 158 of the oil discharge member 156. While the first rotating shaft 204 is rotating, the first flow path 242 is provided at the diametric center of the first rotating shaft 204, and the nozzle portion 158 faces the first flow path 242. Therefore, the cooling oil CO discharged from the nozzle portion 158 easily flows into the first flow path 242. Because the refrigerant supply device 154 pumps the cooling oil CO at a predetermined discharge pressure, the cooling oil CO moves along the first flow path 242 and within the first end 208 of the first rotating shaft 204 toward the large-diameter portion 206. After reaching the large-diameter portion 206, the cooling oil CO flows along the communicating passage 244 formed in the large-diameter portion 206, from the diametrically inward to the diametrically outward direction of the large-diameter portion 206. In this way, the flow direction of the cooling oil CO is changed by the communication passage 244.

[0055] The cooling oil CO moves from the communication passage 244 to the second passage 246. Because the second passage 246 is formed in a spiral shape, the cooling oil CO flowing through the second passage 246 moves toward the second end 214 of the first rotary shaft 204 while circulating in a spiral. Therefore, the permanent magnets 236 exposed to the radiant heat from the electromagnetic coil 270 can be cooled evenly. In this way, according to the present embodiment, the permanent magnets 236 can be efficiently cooled by the cooling oil CO flowing through the refrigerant passage 240.

[0056] The cooling oil CO that has circulated through the second flow path 246 then moves to the relay path 248. In the relay path 248, the cooling oil CO moves from the outside to the inside along the diameter direction of the first rotating shaft 204. Because the first rotating shaft 204 is rotating, centrifugal force acts on the cooling oil CO. However, as described above, the cooling oil CO is pumped at a predetermined discharge pressure. Therefore, the cooling oil CO can flow along the relay path 248 toward the inside in the diameter direction of the first rotating shaft 204.

[0057] The cooling oil CO then moves to the liquid feed path 250. The inner diameter of the liquid feed path 250 gradually increases toward the first connecting end 218. That is, the liquid feed path 250 gradually widens toward the first connecting end 218. Because centrifugal force acts on the cooling oil CO, the cooling oil CO tends to move toward the inner circumferential surface 250a of the liquid feed path 250. Moreover, the cooling oil CO is pumped at a predetermined discharge pressure. Therefore, the cooling oil CO easily moves along the inner circumferential surface 250a of the liquid feed path 250 to the first connecting end 218.

[0058] In the liquid feed path 250, the downstream side in the flow direction is the right portion. A lubricant flow path 262 formed between the inner surface of the first connecting end 218 and the outer circumferential surface of the second connecting end 322 is continuous with the right portion. The cooling oil CO that has circulated through the liquid feed path 250 flows through the lubricant flow path 262.

[0059] A first engagement portion 260 is provided on the inner surface of the first connecting end 218, and a second engagement portion 324 is provided on the outer peripheral surface of the second connecting end 322. The first engagement portion 260 and the second engagement portion 324 are engaged with each other via a spline connection 402 or the like to form a connecting portion 400. The connecting portion 400 is located in a lubricant flow path 262. Therefore, the connecting portion 400 is lubricated by the cooling oil CO flowing through the lubricant flow path 262. When the rotating electrical machine rotor 202 and the turbine rotor 300 rotate, the second engagement portion 324 slides slightly relative to the first engagement portion 260. In this sliding motion, the cooling oil CO acts as a lubricant. Therefore, the second engagement portion 324 slides smoothly relative to the first engagement portion 260.

[0060] As described above, according to this embodiment, the cooling oil CO that cools the permanent magnets 236 can be used as a lubricant that lubricates the connecting portion 400. In other words, the cooling oil CO can serve as both a lubricant and a cooling oil. As described above, the connecting portion 400 is formed as an engagement portion between the first engagement portion 260 of the first rotating shaft 204 and the second engagement portion 324 of the connecting shaft 320 (second rotating shaft 16).

[0061] The cooling oil CO that has flowed through the lubricant flow path 262 is discharged into an internal chamber formed when the recess 286 of the main housing 274 is closed by the second sub-housing 278. The cooling oil CO is then discharged to the outside of the rotating electric machine housing 272 through a drain path 292 formed in the main housing 274. The cooling oil CO is further recovered in the refrigerant recovery tank 152 and then re-pressurized and fed from the refrigerant supply device 154 to the refrigerant flow path 240. The lubricant oil and cooling oil CO supplied to the first bearing 120, the second bearing 122, and the third bearing 124 may be recovered in the refrigerant recovery tank 152, and the oil supplied from the refrigerant supply device 154 may be divided into the lubricant and the cooling oil CO. In this case, there is no need to separately provide the refrigerant supply device 154 and the lubricant supply device, thereby simplifying the rotating electric machine system 20.

[0062] Conversely, the cooling oil CO may be circulated in the following order: lubricant flow path 262, liquid supply path 250, relay path 248, second flow path 246, communication path 244, and first flow path 242. In this case, the oil discharge member 156 is disposed in the recess 286, and the drain path 292 is provided in the first sub-housing 276.

[0063] This embodiment has the following advantages.

[0064] As shown in Fig. 2, in the combined power system 100, which is the rotating machine 10, the first rotating shaft 204 of the rotating electrical machine rotor 202 (first rotating body 12) has a refrigerant flow path 240, a liquid supply path 250, and a first engagement portion 260. In the turbine rotor 300 (second rotating body 14), the connecting shaft 320, which is the second rotating shaft 16, has a second engagement portion 324 that engages with the first engagement portion 260. When the first engagement portion 260 and the second engagement portion 324 are engaged with each other, a lubricant flow path 262 is formed between the first engagement portion 260 and the second engagement portion 324. The lubricant flow path 262 communicates with the refrigerant flow path 240 via the liquid supply path 250.

[0065] Cooling oil CO flows through the refrigerant flow path 240 as a liquid refrigerant RF. The cooling oil CO particularly cools the permanent magnets 236 that constitute the rotating electric machine rotor 202. The cooling oil CO moves to the lubricant flow path 262 via the liquid feed path 250 and serves as a lubricant for the first engagement portion 260 and the second engagement portion 324. Alternatively, the cooling oil CO moves from the lubricant flow path 262 to the refrigerant flow path 240 via the liquid feed path 250. In this case, the cooling oil CO cools the permanent magnets 236 after functioning as a lubricant.

[0066] As described above, according to this embodiment, the cooling oil CO that cools the rotating electric machine rotor 202 (particularly the permanent magnets 236) can be used as both the cooling oil CO and the lubricant that lubricates the coupling portion 400 that is engaged with the first rotating shaft 204 and the second rotating shaft 16. Therefore, it is not necessary to include a supply device for supplying the cooling oil CO and a supply device for supplying the lubricant in the rotating electric machine system 20. This simplifies the configuration of the rotating electric machine system 20. Moreover, the lubricant allows the second engagement portion 324 to slide smoothly relative to the first engagement portion 260.

[0067] In a typical embodiment, the engagement between the first engagement portion 260 and the second engagement portion 324 is a spline connection 402. The spline connection 402 can be well lubricated by a lubricant.

[0068] The liquid transfer path 250 is formed inside the second end 214, which is one axial end of the first rotating shaft 204. The second end 214 includes a hollow first connecting end 218. The connecting shaft 320 has a second connecting end 322 at one axial end. The second connecting end 322 is inserted into the hollow first connecting end 218. In this configuration, the first engaging portion 260 is formed on the inner circumferential surface of the first connecting end 218, and the second engaging portion 324 is formed on the outer circumferential surface of the second connecting end 322.

[0069] By connecting the liquid feed path 250 to the inside of the first connecting end portion 218, the liquid feed path 250 and the lubricant flow path 262 can be easily connected to each other.

[0070] The refrigerant flow path 240 has a first flow path 242, a second flow path 246, a communication path 244, and a relay path 248. The first flow path 242 is formed inside the other axial end (first end 208) of the first rotating shaft 204. The second flow path 246 is formed on a side portion of the first rotating shaft 204. The communication path 244 connects the first flow path 242 and the second flow path 246. The relay path 248 connects the second flow path 246 and the liquid supply path 250. The communication path 244 and the relay path 248 extend from the inside in the diameter direction of the first rotating shaft 204 toward the outer circumferential surface of the first rotating shaft 204.

[0071] According to this configuration, the cooling oil CO can be easily circulated from the refrigerant flow path 240 toward the engagement portion between the first engagement portion 260 and the second engagement portion 324, or in the opposite direction.

[0072] The first rotating body 12 has a cover member 230 that covers the outer periphery of the first rotating shaft 204. In the above embodiment, the cover member 230 is a sleeve 232. The first rotating shaft 204 has an outer groove 247 on its outer periphery. The second flow path 246 is formed by the outer groove 247 being covered by the sleeve 232.

[0073] The first flow path 242, the communication path 244, the relay path 248, and the liquid supply path 250 are formed inside the first rotating shaft 204, and the outer groove 247 forming the second flow path 246 is covered with the sleeve 232. This prevents foreign matter from being mixed into the cooling oil CO. In addition, since the second flow path 246 is close to the permanent magnet 236, the permanent magnet 236 can be sufficiently cooled.

[0074] In one aspect, the outer groove 247 is a spiral groove 247a that spirals around the outer circumferential surface of the first rotating shaft 204. Therefore, the cooling oil CO spirals when flowing through the second flow path 246. This allows the permanent magnets 236 to be cooled evenly.

[0075] The inner diameter of the liquid feed path 250 gradually increases as it approaches the first engagement portion 260. As the first rotating shaft 204 rotates, centrifugal force acts on the cooling oil CO flowing through the liquid feed path 250, so the cooling oil CO easily moves along the inner circumferential surface of the liquid feed path 250 toward the first engagement portion 260. Therefore, it is easy to supply the cooling medium to the lubricant flow path 262.

[0076] The combined power system 100 includes a refrigerant supply device 154 that pumps cooling oil CO. The refrigerant supply device 154 applies pressure to the cooling oil CO and supplies it to the refrigerant flow path 240 or the lubricant flow path 262. Therefore, the cooling oil CO can move from the outer circumferential surface of the first rotating shaft 204 to the inside against centrifugal force. This allows for a high degree of freedom in the flow direction of the cooling oil CO. This also allows for a high degree of freedom in the shape of the refrigerant flow path 240, etc.

[0077] In an exemplary embodiment, the refrigerant supply 154 pumps the cooling oil CO from the refrigerant flow path 240 toward the lubricant flow path 262.

[0078] The pressure loss in the refrigerant flow path 240 is smaller than the pressure loss in the lubricant flow path 262. Therefore, when the cooling oil CO is circulated in the above direction, the cooling oil CO moves more smoothly than when the liquid refrigerant RF is circulated from the lubricant flow path 262 toward the refrigerant flow path 240.

[0079] The second rotor 14 is a turbine rotor 300 that constitutes a part of the gas turbine engine 30 .

[0080] In this configuration, when the turbine rotor 300 rotates, the rotational driving force of the turbine rotor 300 is transmitted to the first rotating shaft 204. As a result, the rotating electric machine rotor 202 rotates integrally with the turbine rotor 300, and electricity is generated in the rotating electric machine 200.

[0081] An output shaft 330 of the turbine rotor 300 is connected to the first rotating shaft 204 via a connecting shaft 320 serving as the second rotating shaft 16. The connecting shaft 320 serves as a spacer, so that the output shaft 330 can be connected to the first rotating shaft 204 while preventing the rotating electric machine housing 272 from interfering with the engine housing 302.

[0082] In a typical embodiment, cooling oil CO is used as the liquid refrigerant RF. The oil sufficiently reduces the frictional resistance between the first engagement portion 260 and the second engagement portion 324, and also sufficiently cools the first engagement portion 260 and the second engagement portion 324. In other words, oil is suitable as the liquid refrigerant RF, which has both a lubricating effect and a cooling effect.

[0083] The following additional notes are further disclosed regarding the above embodiment.

[0084] (Appendix 1) A rotary machine (10) of the present disclosure includes a first rotating body (12) including a first rotating shaft (204) and a second rotating body (14) including a second rotating shaft (16) that rotates integrally with the first rotating shaft. The first rotating shaft has a refrigerant flow path (240) through which a liquid refrigerant (RF) flows, a liquid feed path (250) that communicates with the refrigerant flow path, and a first engagement portion (260) provided at a first connection end (218) that is one end of the first rotating shaft in the axial direction. The second rotating shaft has a second connection end (322) that overlaps the first connection end in the diameter direction of the first connection end, and a second engagement portion (324) provided at the second connection end.

[0085] The first engagement portion and the second engagement portion are a connecting portion (400) that transmits a rotational driving force between the first rotating shaft and the second rotating shaft. The second engagement portion is engaged with the first engagement portion so as to be slidable relative to the first engagement portion along the axial direction. A lubricant flow path (262) that communicates with the liquid feed path and through which the liquid refrigerant can pass as a lubricant is formed between the first engagement portion and the second engagement portion that are engaged with each other. The liquid feed path is interposed between the refrigerant flow path and the lubricant flow path.

[0086] With this configuration, the liquid refrigerant can be used both as a liquid refrigerant for cooling the first rotating body and as a lubricant for lubricating the connection point between the first rotating shaft and the second rotating shaft (the engagement point between the first engagement portion and the second engagement portion).

[0087] (Appendix 2) In the rotary machine according to Supplementary Note 1, the engagement between the first engaging portion and the second engaging portion may be a spline connection (402).

[0088] In this case, the spline connection can be well lubricated.

[0089] (Appendix 3) In the rotary machine described in Supplementary Note 1 or 2, the liquid supply path may be formed inside the one end of the first rotating shaft, the first connecting end may be hollow, the second connecting end may be inserted into the first connecting end, the first engaging portion may be formed on an inner peripheral surface of the first connecting end, and the second engaging portion may be formed on an outer peripheral surface of the second connecting end.

[0090] According to this configuration, it is easy to communicate the liquid feed path with the lubricant flow path.

[0091] (Appendix 4) In the rotary machine described in Supplementary Note 3, the refrigerant flow path may have a first flow path (242) formed inside the other end of the first rotating shaft in the axial direction, a second flow path (246) formed on a side of the first rotating shaft, a communication passage (244) connecting the first flow path and the second flow path, and an intermediate passage (248) connecting the second flow path and the liquid supply path, and the communication passage and the intermediate passage may extend from the inside in the diameter direction of the first rotating shaft toward the outer peripheral surface.

[0092] The liquid coolant can be easily circulated from the coolant flow path toward the connection point between the first and second rotary shafts, or in the opposite direction.

[0093] (Appendix 5) In the rotary machine described in Appendix 4, the first rotating body may have a cover member (230) covering the outer periphery of the first rotating shaft, the first rotating shaft may have an outer groove (247) on the outer periphery, and the second flow path may be formed by the outer groove being covered by the cover member.

[0094] The liquid coolant flowing through the second flow path can cool the cover member and the members around the cover member.

[0095] (Appendix 6) In the rotary machine described in Supplementary Note 5, the outer groove may be a spiral groove (247a) that spirals around the outer circumferential surface of the first rotary shaft.

[0096] The liquid refrigerant flows in a spiral path, so that the liquid refrigerant can be distributed evenly over the outer circumferential surface of the first rotary shaft.

[0097] (Appendix 7) In the rotary machine according to any one of Supplementary Notes 4 to 6, the inner diameter of the liquid feed path may gradually increase as it approaches the first engagement portion.

[0098] When the first rotating shaft rotates, centrifugal force acts on the liquid refrigerant flowing through the liquid feed path. When the liquid refrigerant flows from the liquid feed path to the lubricant flow path, the liquid refrigerant moves easily along the inner circumferential surface of the liquid feed path because the inner circumferential surface of the liquid feed path gradually expands in diameter. This makes it easy to supply the cooling medium to the lubricant flow path.

[0099] (Appendix 8) The rotary machine according to any one of Supplementary Notes 1 to 7 may further include a refrigerant supply device (154) that pumps the liquid refrigerant.

[0100] (Appendix 9) In the rotary machine described in Supplementary Note 8, the refrigerant supply device may pump the liquid refrigerant from the refrigerant flow path toward the lubricant flow path.

[0101] The refrigerant supply device applies pressure to the liquid refrigerant and supplies it to the refrigerant flow path. Therefore, the liquid refrigerant can move from the outer circumferential surface of the first rotating shaft to the interior against centrifugal force. This allows for a high degree of freedom in the flow direction of the liquid refrigerant. This also allows for a high degree of freedom in the shape of the refrigerant flow path.

[0102] (Appendix 10) In the rotary machine according to any one of Supplementary Notes 1 to 9, the first rotor may be a rotary electric machine rotor (202) that constitutes a rotary electric machine (200).

[0103] The permanent magnets that constitute the rotor of the rotating electric machine can be cooled by the liquid refrigerant that flows through the refrigerant flow path.

[0104] (Appendix 11) In the rotary machine described in Supplementary Note 10, the second rotating body may be a turbine rotor (300) that constitutes a gas turbine engine (30).

[0105] When the turbine rotor rotates, the rotational driving force of the turbine rotor can be transmitted to the first rotating shaft via the second rotating shaft, so that the first rotating shaft rotates integrally with the second rotating shaft and electricity is generated in the rotating electric machine.

[0106] (Appendix 12) In the rotary machine described in Supplementary Note 11, the turbine rotor may have an output shaft (330), and the output shaft may be connected to the first rotary shaft via the second rotary shaft.

[0107] The second rotating shaft serves as a spacer, so that the rotating electrical machine system can be easily combined with the gas turbine engine while preventing the engine housing from interfering with the rotating electrical machine housing.

[0108] (Appendix 13) In the rotary machine according to any one of Supplementary notes 1 to 12, the liquid refrigerant may be oil (CO).

[0109] The oil sufficiently reduces the frictional resistance between the first and second engagement portions and sufficiently cools the first and second engagement portions, making the oil suitable as a liquid refrigerant that has both lubricating and cooling properties.

[0110] The present invention is not limited to the above disclosure, and various configurations can be adopted without departing from the gist of the present invention. [Explanation of symbols]

[0111] 10... Rotating machine 12... First rotating body 14... Second rotating body 16... Second rotating shaft 20... Rotating electrical system 30... Gas turbine engine 100... Combined power system 154... Refrigerant supply device 202... Rotating electric machine rotor 204... First rotating shaft 218...first connecting end portion 230...cover member 236... Permanent magnet 240... Coolant flow path 247...Outer groove 250...Liquid transfer path 260...first engagement portion 262...lubricant flow path 292...Drain path 300...Turbine rotor 320...connecting shaft 322...second connecting end 324... Second engagement portion 330... Output shaft 400...connection portion 402, 404...spline connection CO…Cooling oil RF…Liquid refrigerant

Claims

1. A rotary machine including a first rotating body including a first rotating shaft and a second rotating body including a second rotating shaft that rotates integrally with the first rotating shaft, the first rotating shaft has a refrigerant flow path through which a liquid refrigerant flows, a liquid feed path communicating with the refrigerant flow path, and a first engaging portion provided at a first connecting end portion which is one end portion of the first rotating shaft in an axial direction, the second rotary shaft has a second connecting end portion overlapping the first connecting end portion in a diameter direction of the first connecting end portion, and a second engaging portion provided on the second connecting end portion; the first engaging portion and the second engaging portion are connecting portions that transmit a rotational driving force between the first rotating shaft and the second rotating shaft, the second engagement portion engages with the first engagement portion so as to be slidable relative to the first engagement portion along the axial direction, a lubricant flow path is formed between the first engaging portion and the second engaging portion, the lubricant flow path being in communication with the liquid feed path and allowing the liquid refrigerant to pass therethrough as a lubricant; The liquid supply path is interposed between the refrigerant flow path and the lubricant flow path.

2. 2. The rotary machine according to claim 1, wherein the engagement between the first engaging portion and the second engaging portion is a spline connection.

3. 2. A rotary machine according to claim 1, wherein the liquid supply path is formed inside the one end of the first rotating shaft, the first connecting end is hollow, the second connecting end is inserted into the first connecting end, the first engaging portion is formed on the inner surface of the first connecting end, and the second engaging portion is formed on the outer surface of the second connecting end.

4. 4. The rotary machine according to claim 3, wherein the refrigerant flow path includes a first flow path formed inside the other end of the first rotating shaft in the axial direction, a second flow path formed on a side of the first rotating shaft, a communication path that communicates the first flow path with the second flow path, and a relay path that communicates the second flow path with the liquid feed path, The communication passage and the relay passage extend from the inner side in the diameter direction of the first rotating shaft toward the outer peripheral surface.

5. 5. The rotary machine according to claim 4, wherein the first rotating body has a cover member that covers an outer periphery of the first rotating shaft, and the first rotating shaft has an outer groove on the outer periphery. The second flow path is formed by covering the outer groove with the cover member.

6. 6. The rotary machine according to claim 5, wherein the outer groove is a spiral groove that spirals around the outer circumferential surface of the first rotary shaft.

7. 5. The rotary machine according to claim 4, wherein an inner diameter of the liquid feed path gradually increases as the liquid feed path approaches the first engagement portion.

8. The rotary machine according to claim 1 , further comprising a refrigerant supply device for pumping the liquid refrigerant.

9. 9. The rotary machine of claim 8, wherein the refrigerant supply device pumps the liquid refrigerant from the refrigerant flow path toward the lubricant flow path.

10. 10. The rotary machine according to claim 1, wherein the first rotor is a rotor of a rotary electric machine.

11. 11. The rotary machine according to claim 10, wherein the second rotating body is a turbine rotor that constitutes a gas turbine engine.

12. 12. The rotary machine of claim 11, wherein the turbine rotor has an output shaft, the output shaft being coupled to the first rotatable shaft via the second rotatable shaft.

13. 2. The rotary machine of claim 1, wherein the liquid refrigerant is oil.

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