Flow path structure for coolant in rotating machinery

Abstract

To provide flow path structure for coolant in rotating machinery having an outer peripheral wall, the flow path structure enabling a flow path in a thick wall portion of the outer peripheral wall to be maintained in such a way as to be filled with coolant, the flow path structure thereby enabling the entire rotating machinery to be appropriately cooled.SOLUTION: Flow path structure for coolant in rotating machinery comprises: a flow path main body 1 which is provided within the wall thickness portion a frame 5 in such a way that the main body 1 extends in a serpentine manner along the axial direction of the frame 5 and through which coolant flows during cooling; a coolant inlet flow path portion 22a which is provided in such a way that it connects to one end of the flow path main body 31 and is used for introducing the coolant into the flow path main body 31 from the outside; and a coolant outlet flow path portion 23a which is provided in such a way that it connects to the other end of the flow path main body 31 and is used for discharging the coolant in the flow path main body 31 to the outside. The flow path main body 31 has, in order from the coolant inlet flow path portion 22a side, an inlet side circumferential flow path portion 32, an inlet side reverse flow path portion 33, an intermediate circumferential flow path portion 34, a discharge side reverse flow path portion 35, and a discharge side circumferential flow path portion 36.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a flow path structure for a coolant that is applicable to various rotating machines such as drive or rotation motors for electric vehicles and heavy machinery, and further to generators, for cooling the rotating machines. [Background technology]

[0002] Conventionally, a flow path structure applied to a motor and having a cooling water passage through which cooling water flows on its outer peripheral surface is known, for example, as described in Patent Document 1. This motor has a cylindrical frame that constitutes its outer peripheral wall, and a water jacket having a cooling water passage is provided so as to cover the outer peripheral surface of the frame. Specifically, the water jacket has a cylindrical outer peripheral wall having an inner diameter larger than the outer diameter of the motor frame, and a plurality of fins that are arranged between the outer peripheral wall and the motor frame, extend a predetermined length along the axial direction of the motor, and protrude in the radial direction of the motor. These fins are arranged at a predetermined interval from each other in the circumferential direction of the frame, with one end in the length direction alternately shifted to one side and the other side in the axial direction of the motor. As a result, a cooling water passage that extends in a meandering manner along the circumferential direction of the frame is formed on the outer peripheral surface side of the motor frame.

[0003] The water jacket is provided with a cooling water inlet and a cooling water outlet at one end in the axial direction of the motor, adjacent to each other in the circumferential direction of the water jacket. The water jacket is further provided with a partition wall between the cooling water inlet and the cooling water outlet, which is formed in a manner similar to the fins, extends over the entire axial direction of the motor, and separates the cooling water inlet side from the cooling water outlet side.

[0004] In a motor having a cooling water passage configured as described above, when cooling water is sent to the cooling water inlet by a pump or the like, the cooling water flows along the cooling water passage, i.e., on the outer peripheral surface of the motor frame, in a serpentine manner along the circumferential direction of the frame. After making approximately one full circle around the outer peripheral surface of the frame, the cooling water is discharged to the outside from the cooling water outlet. In this way, by the cooling water flowing on the outer peripheral surface of the motor frame, heat generation accompanying the rotation of the motor is suppressed by heat exchange with the cooling water, and the motor is cooled more efficiently than with an air-cooled type. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 60-153653 (Figure 2) Summary of the Invention [Problem to be solved by the invention]

[0006] However, the motor with the above-mentioned cooling water passage has the following problem. That is, as shown in Fig. 2 of Patent Document 1, when the motor is installed so that the motor shaft extends vertically, the cooling water meanders up and down along the cooling water passage and flows almost once around the outer circumferential surface of the motor frame. In this case, if the flow rate of the cooling water sent out from the cooling water inlet is insufficient, the cooling water flows without filling the upper end of the cooling water passage, and as a result, there is a risk that the upper end of the motor cannot be cooled.

[0007] Of course, when the cooling water passage is filled with cooling water, it is possible to cool the entire motor by sending new cooling water to the cooling water inlet when the motor starts to operate. However, in the above motor, the amount of cooling water filling the cooling water passage may decrease due to a difference in timing between stopping the sending and discharging of cooling water when the motor stops, or due to leakage of cooling water from the cooling water outlet while the motor is stopped, and as a result, air may accumulate at the top of the cooling water passage. If such air is present in the cooling water passage when the motor is operating, the motor may not be able to be properly cooled. In order to avoid such problems, the user of the motor must bleed the air or fill the cooling water passage with cooling water, which may require cumbersome work before the motor starts to operate.

[0008] The present invention has been made to solve the above-mentioned problems, and has an object to provide a coolant flow path structure in a rotating machine that can maintain the flow paths within the thick wall portion of the outer peripheral wall of the rotating machine filled with coolant, thereby allowing the entire rotating machine to be properly cooled. [Means for solving the problem]

[0009] In order to achieve the above object, the invention according to claim 1 provides a flow path structure for a coolant provided in a cylindrical outer peripheral wall of a rotary machine for cooling the rotary machine, the flow path structure including: a flow path main body that is provided within a wall thickness portion of the outer peripheral wall so as to extend in a meandering manner along the axial direction of the outer peripheral wall, through which the coolant flows during cooling; a coolant inlet flow path portion that is provided so as to be connected to one end of the flow path main body, for introducing the coolant into the flow path main body from the outside; and a coolant outlet flow path portion that is provided so as to be connected to the other end of the flow path main body, for discharging the coolant in the flow path main body to the outside, the flow path main body extending from the coolant inlet flow path portion approximately once around the circumferential direction of the outer peripheral wall. the coolant discharge passage section connected to the intermediate circumferential flow passage section and configured to reverse the flow direction of the coolant that has flowed through the introduction-side circumferential flow passage section; an intermediate circumferential flow passage section connected to the introduction-side circumferential flow passage section and extending approximately one revolution in the circumferential direction of the outer peripheral wall; a discharge-side circumferential flow passage section connected to the intermediate circumferential flow passage section and reversing the flow direction of the coolant that has flowed through the intermediate circumferential flow passage section so as to guide it to the coolant discharge passage section side; and a discharge-side circumferential flow passage section connected to the discharge-side circumferential flow passage section and extending approximately one revolution in the circumferential direction of the outer peripheral wall and connected to the coolant discharge passage section.

[0010] According to this configuration, a flow path main body is provided in a thick wall portion of a cylindrical outer peripheral wall of a rotary machine, and extends in a meandering manner along the axial direction of the outer peripheral wall, and the above-mentioned cooling liquid inlet flow path portion and the cooling liquid outlet flow path portion are provided so as to be connected to one end and the other end of the flow path main body, respectively. In addition, the flow path main body is provided with the above-mentioned inlet-side circumferential flow path portion, inlet-side reverse flow path portion, intermediate circumferential flow path portion, discharge-side reverse flow path portion, and discharge-side circumferential flow path portion connected to each other in this order from the coolant inlet flow path portion side, and the cooling liquid outlet flow path portion is provided at the end of the discharge-side circumferential flow path portion. The above-mentioned inlet-side circumferential flow path portion, intermediate circumferential flow path portion, and discharge-side circumferential flow path portion all extend approximately one revolution in the circumferential direction of the outer peripheral wall, and the inlet-side reverse flow path portion and the discharge-side circumferential flow path portion are configured to reverse the flow direction of the cooling liquid flowing from the upstream side and flow the cooling water downstream.

[0011] In the flow path structure configured as described above, the coolant introduced into the coolant introduction flow path flows in the introduction-side circumferential flow path, the introduction-side reverse flow path, the intermediate circumferential flow path, the discharge-side reverse flow path, and the discharge-side circumferential flow path in that order, and is discharged to the outside from the coolant discharge flow path while maintaining each flow path filled. As described above, according to the flow path structure of the present invention, the flow path main body through which the coolant flows is provided in the thick wall portion of the outer peripheral wall of the rotating machine so as to extend in a meandering manner along the axial direction of the outer peripheral wall. Therefore, regardless of the installation position of the rotating machine, it is relatively easy to maintain the flow path main body filled with the coolant compared to the conventional art, and therefore the entire rotating machine that generates heat during operation can be appropriately cooled.

[0012] The invention of claim 2 is characterized in that, in the coolant flow path structure of the rotating machine described in claim 1, the mid-circumferential flow path portion is composed of a single mid-circumferential flow path portion or of a plurality of mid-circumferential flow path portions arranged side by side in the axial direction and whose ends are connected to each other.

[0013] According to this configuration, since the intermediate circumferential flow passage portion is composed of a single intermediate circumferential flow passage portion or multiple intermediate circumferential flow passage portions, the number of intermediate circumferential flow passage portions can be appropriately set according to the shape, size, structure, etc. of the rotating machine. For example, when the axial length of the rotating machine is relatively short, a single intermediate circumferential flow passage portion can be set, whereas when the axial length of the rotating machine is relatively long, a plurality of intermediate circumferential flow passage portions can be set.

[0014] The invention of claim 3 is characterized in that, in the coolant flow path structure of the rotating machine described in claim 1, the rotating machine is provided with a cylindrical stator installed inside the outer peripheral wall, the stator is formed in a convex shape extending along its axial direction and protruding radially outward, and has a plurality of engaging protrusions arranged at predetermined angles from each other in the circumferential direction, and the outer peripheral wall is configured in a concave shape opening radially inward by extending along the axial direction of the outer peripheral wall and being formed in a convex shape protruding radially outward, and has a plurality of stator anti-rotation portions with which the plurality of engaging protrusions each engage.

[0015] According to this configuration, a cylindrical stator is installed inside the outer peripheral wall of the rotating machine, and the stator has a plurality of engaging protrusions formed in a convex shape extending along the axial direction and protruding radially outward, the engaging protrusions being provided at predetermined angles from each other in the circumferential direction. The outer peripheral wall of the rotating machine also has a plurality of stator anti-rotation portions. These stator anti-rotation portions extend along the axial direction of the outer peripheral wall, and are formed in a convex shape protruding radially outward, thereby being configured in a concave shape opening radially inward. When the stator is installed inside the outer peripheral wall, the multiple engaging protrusions of the stator respectively engage with the multiple stator anti-rotation portions of the outer peripheral wall. This allows the stator of the rotating machine to be stably installed inside the outer peripheral wall in a non-rotatable state.

[0016] The invention of claim 4 is characterized in that, in the coolant flow path structure in the rotating machine described in claim 3, the outer peripheral wall is formed in a cylindrical shape, a stator is attached to the inner peripheral surface side, and an inner frame is formed in a groove portion for forming a flow path main body on the outer peripheral surface side, and an outer frame is formed in a cylindrical shape and is overlapped on the inner frame with the inner frame inserted inside, thereby forming the flow path main body between the groove portion and the inner peripheral surface.

[0017] According to this configuration, the outer peripheral wall of the rotating machine has an inner frame and an outer frame, both of which are formed into a cylindrical shape. The inner frame has a stator attached to its inner peripheral surface, and a groove for forming a flow path main body formed on its outer peripheral surface. By overlapping the outer frame on the inner frame with the inner frame inserted inside the outer frame, the flow path main body can be easily formed between the groove of the inner frame and the inner peripheral surface of the outer frame.

[0018] The invention of claim 5 is characterized in that, in the coolant flow path structure of the rotating machine described in claim 4, the portions of the inner frame and the outer frame corresponding to the stator anti-rotation portions are formed in a convex shape protruding radially outward.

[0019] According to this configuration, the portions of the inner frame and the outer frame corresponding to the stator anti-rotation portion are formed in a convex shape that protrudes radially outward, so that the size of the cross section of the flow path main body can be kept almost constant without significant change around the stator anti-rotation portion. This makes it possible to prevent the pressure loss of the coolant from increasing when the coolant flows through the portions corresponding to the stator anti-rotation portion, and ensures a smooth flow of the coolant.

[0020] The invention of claim 6 is characterized in that, in the coolant flow path structure for the rotating machine described in claim 5, the coolant inlet flow path portion and the coolant outlet flow path portion extend radially of the outer peripheral wall and are provided at positions corresponding to a predetermined one of a plurality of stator anti-rotation portions, and the inner frame has a guide surface formed on the outer peripheral surface corresponding to the predetermined stator anti-rotation portion so as to be convexly curved radially outward, and guides the coolant flowing in through the coolant inlet flow path portion to the flow path main body.

[0021] According to this configuration, the coolant inlet flow passage portion and the coolant outlet flow passage portion both extend in the radial direction of the outer peripheral wall and are provided at positions corresponding to the predetermined stator anti-rotation portion. The inner frame also has a guide surface that guides the coolant that has flowed in through the coolant inlet flow passage portion to the flow passage main body. This guide surface is provided on the outer peripheral surface that corresponds to the predetermined stator anti-rotation portion and is formed so as to be curved convexly outward in the radial direction. As a result, the coolant introduced into the coolant inlet flow passage portion is smoothly guided by the guide surface to the flow passage main body side, and as a result, the coolant can be sent out to the flow passage main body while almost maintaining the flow velocity of the coolant introduced into the coolant inlet flow passage portion. [Brief description of the drawings]

[0022] [Figure 1] 1A and 1B are perspective views showing a motor to which a coolant flow path structure according to one embodiment of the present invention is applied, the motor being placed horizontally, (a) showing the entire motor, and (b) showing the motor with the front bracket removed. [Diagram 2]FIG. 2 is a perspective view showing the motor shown in FIG. 1(a) in a vertically placed state, where (a) shows the entire motor and (b) shows the motor with the end bracket removed. [Diagram 3] FIG. 2A is a perspective view showing the motor shown in FIG. 1A with a front bracket, an end bracket, and a terminal removed, and FIG. 2B is an exploded perspective view showing the motor shown in FIG. [Figure 4] 1A and 1B are diagrams for explaining the structure of the frame, in which (a) is a perspective view showing the entire frame placed horizontally, and (b) is a perspective view showing the frame shown in (a) exploded into an inner frame and an outer frame. [Diagram 5] FIG. 2 is a diagram for explaining the structure of the frame, in which (a) is a perspective view showing the entire frame placed vertically, and (b) is a cross-sectional view taken along line AA of the frame shown in (a). [Figure 6] 3(a) is a side view of the motor shown in FIG. 3(a) placed vertically, and (b), (c), (d) and (e) are cross-sectional views taken along lines BB, CC, DD and EE of the motor shown in (a), respectively. [Figure 7] FIG. 2A is a perspective view showing the flow path of the cooling water in the frame of a vertically placed motor, and FIG. 2B is a view showing the flow path of the cooling water shown in FIG. [Figure 8] 7(a) and (b) are diagrams illustrating the flow paths of the cooling water corresponding to the flow paths in FIGS. 7(a) and (b), respectively. [Figure 9] FIG. 13 is a diagram showing a modified example of the flow passage body, in which three intermediate circumferential flow passage sections are set. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 shows a motor 1 (rotating machine) to which a coolant flow path structure according to one embodiment of the present invention is applied, in a horizontally placed state, (a) showing the whole, and (b) showing the state with the front bracket 6 removed. Fig. 2 shows the motor 1 shown in Fig. 1(a) in a vertically placed state, (a) showing the whole, and (b) showing the state with the end bracket 7 removed. Note that the above "horizontally placed" refers to a state in which the motor 1 is placed so that the shaft 2 of the motor 1 is in a horizontally extended position, and the above "vertically placed" refers to a state in which the motor 1 is placed so that the shaft 2 of the motor 1 is in a vertically extended position.

[0024] The motor 1 shown in Figs. 1 and 2 is used, for example, as a motor for turning heavy machinery, and in that case, it is generally installed in a vertical position as shown in Fig. 2(a).

[0025] Fig. 3(a) shows the motor 1 shown in Fig. 1(a) with the front bracket 6, end bracket 7 and terminal 9 removed, and Fig. 3(b) shows the motor 1 shown in (a) in an exploded state. As shown in Figs. 1 to 3, the motor 1 includes a shaft 2 having a predetermined length, a rotor 3 through which the shaft 2 passes and which is fixed to the shaft 2, a stator 4 provided so as to surround the outer periphery of the rotor 3, a frame 5 (outer periphery wall) formed in a cylindrical shape covering the rotor 3 and the stator 4 and having a flow path 10 for cooling water (cooling liquid) in the wall thickness portion, a front bracket 6 and an end bracket 7 attached to the front and rear of the frame 5 in the axial direction, respectively, and a terminal 9 provided at the rear end of the outer periphery of the frame 5 for supplying electric power to the stator 4.

[0026] As shown in Fig. 1(a), one end of the shaft 2 passes through a central hole 6a of a front bracket 6, and a pinion 2a is provided at the tip end. The front bracket 6 is provided with a flange portion 6b that protrudes in the radial direction on its periphery, and the flange portion 6b is provided with a plurality of mounting holes 6c (12 in Fig. 1(a)) for mounting the motor 1. The front bracket 6 is further provided with a plurality of connecting holes 6d (6 in Fig. 1(a)), and the front bracket 6 is connected to the front surface of the frame 5 via connecting bolts 6e inserted into the respective connecting holes 6d.

[0027] As shown in Fig. 2(a), the end bracket 7 is formed in a predetermined shape covering the entire rear surface of the frame 5, and is connected to the rear surface of the frame 5 via a plurality of connecting bolts 7a (seven in Fig. 2(a)). Bearings are fixed to the inside of the front bracket 6 and the end bracket 7, respectively, and the shaft 2 is rotatably supported by these bearings.

[0028] As shown in FIG. 3(b), the rotor 3 is formed in a thick cylindrical shape and includes a rotor core 3a fixed to the shaft 2 that passes through the center, and a plurality of permanent magnets (not shown) embedded inside the rotor core 3a.

[0029] The stator 4 includes a cylindrical stator core 4a and a three-phase stator coil 4b wound around the stator core 4a. The outer peripheral surface of the stator core 4a is provided with three engaging protrusions 8 arranged at equal angles to each other in the circumferential direction. Each engaging protrusion 8 extends along the axial direction of the stator core 4a over the entire length of the stator core 4a and protrudes in an arc shape radially outward from the stator core 4a. Each engaging protrusion 8 is formed with a bolt hole 8a extending along the axial direction and through which a fixing bolt is inserted.

[0030] Fig. 4(a) and Fig. 5(a) show the frame 5 placed horizontally and vertically, respectively. Fig. 4(b) shows the frame 5 shown in Fig. 4(a) in an exploded state, and Fig. 5(b) is a cross-sectional view of the frame 5 shown in Fig. 4(a) taken along line AA.

[0031] As shown in Figures 4 and 5, the frame 5 has an inner frame 11 formed in a cylindrical shape, and the stator 4 is attached to its inner surface side, and an outer frame 12 formed in a cylindrical shape, and stacked on the inner frame 11 with the inner frame 11 inserted inside to form the flow path main body 31 of the flow path 10 through which the cooling water flows.

[0032] 4(b), the inner frame 11 has a frame main body 13 having a groove 13a of a predetermined shape for forming the flow path 10 on its outer circumferential surface, and an expanded diameter portion 14 connected to the rear end of the frame main body 13 and formed with an outer diameter larger than that of the frame main body 13. The groove 13a is open to the radially outer side of the inner frame 11 and is formed so as to extend in a serpentine manner along the axial direction of the inner frame 11.

[0033] The frame main body 13 is also provided with three stator anti-rotation portions 15 that are arranged at equal angles to one another in the circumferential direction and engage with three engaging protrusions 8 of the stator 4 installed on the inside. Each stator anti-rotation portion 15 extends along the axial direction of the frame main body 13 from a predetermined position at the front end to the rear end of the frame main body 13, and is formed in a convex shape that protrudes radially outward, thereby being configured in a concave shape that opens radially inward.

[0034] The expanded diameter portion 14 is provided at a predetermined position on the outer circumferential surface thereof with a terminal installation portion 14a for installing a terminal 9 for supplying electric power to the three-phase stator coil 4b in the stator 4 from the outside.

[0035] 4, the outer frame 12 is provided with three anti-rotation corresponding parts 21 that are arranged at equal angles to one another in the circumferential direction and respectively correspond to the three stator anti-rotation parts 15 of the inner frame 11. Each anti-rotation corresponding part 21 extends along the axial direction of the outer frame 12 over almost the entire length of the outer frame 12, and is formed in a convex shape that protrudes radially outward, thereby being configured in a concave shape that opens radially inward.

[0036] Further, the outer frame 12 is provided, at a predetermined identical anti-rotation corresponding portion 21, with a cooling water inlet portion 22 for introducing cooling water into the flow path main body 31, and a cooling water outlet portion 23 for discharging the cooling water in the flow path main body 31 to the outside. The cooling water inlet portion 22 and the cooling water outlet portion 23 are formed in a cylindrical shape extending a predetermined length in the radial direction of the outer frame 12, and an inlet flow path portion 22a (cooling liquid inlet flow path portion) and an outlet flow path portion 23a (cooling liquid outlet flow path portion) therein communicate with both ends of the flow path main body 31, respectively.

[0037] 5(b), in the frame 5 in which the outer frame 12 is overlapped on the inner frame 11, a flow path body 31 is formed in the thick wall portion of the frame 5 by the groove portion 13a of the inner frame 11 and the inner peripheral surface of the outer frame 12. As shown in FIG. 5(b), in this frame 5, the flow path body 31 is kept watertight by an upper O-ring 25 and a lower O-ring 26 installed above and below the flow path body 31, respectively.

[0038] Fig. 6(a) shows a side view of the motor 1 shown in Fig. 3(a) in a vertically placed state, and Figs. 6(b), (c), (d) and (e) show cross-sectional views of the motor 1 shown in Fig. 6(a) taken along lines BB, CC, DD and EE, respectively. Fig. 7(a) shows a three-dimensional view of the flow passage 10 in the frame 5 of the vertically placed motor 1, and Fig. 7(b) shows the flow passage 10 developed in the circumferential direction of the frame 5.

[0039] As shown in Figures 6 and 7, the flow path 10 includes a flow path main body 31 that extends in a serpentine manner along the axial direction of the frame 5 (the vertical direction in Figures 6(a) and 7), an inlet flow path section 22a that is connected to the lower end of the flow path main body 31 and is located within the cooling water inlet section 22, and a discharge flow path section 23a that is connected to the upper end of the flow path main body 31 and is located within the cooling water discharge section 23.

[0040] Specifically, the flow path main body 31 has an inlet side circumferential flow path section 32 extending from the inlet flow path section 22a in a circumferential direction of the frame 5 in an approximately one revolution manner, an inlet side reversing flow path section 33 connected to the inlet side circumferential flow path section 32 and reversing the flow direction of the cooling water that has flowed through the inlet side circumferential flow path section 32, an intermediate circumferential flow path section 34 connected to the inlet side circumferential flow path section 32 in an approximately one revolution manner, a discharge side reversing flow path section 35 connected to the inlet side circumferential flow path section 32 in an approximately one revolution manner, and a discharge side circumferential flow path section 36 connected to the inlet side circumferential flow path section 32 in an approximately one revolution manner, and connected to the discharge flow path section 23a.

[0041] As shown in FIG. 5(b), the inlet-side circumferential flow passage section 32, the intermediate circumferential flow passage section 34, and the discharge-side circumferential flow passage section 36 of the flow passage body 31 are formed in a vertically elongated rectangular cross section, and have a flow passage width (the vertical width in FIG. 5(b) and FIG. 7(b)) and a flow passage depth (the horizontal width in FIG. 5(b)) of predetermined dimensions.

[0042] 6 and 7, the introduction side circumferential flow passage section 32, the intermediate circumferential flow passage section 34, and the discharge side circumferential flow passage section 36 each have two convex flow passage sections that protrude radially outward, corresponding to two predetermined stator rotation stop sections 15, 15 of the inner frame 11. Specifically, in order from the introduction flow passage section 22a side, which is the upstream side, the introduction side circumferential flow passage section 32 is provided with two convex flow passage sections 32a, 32b, the intermediate circumferential flow passage section 34 is provided with two convex flow passage sections 34a, 34b, and further, the discharge side circumferential flow passage section 36 is provided with two convex flow passage sections 36a, 36b.

[0043] On the other hand, the inlet-side reverse flow channel section 33 and the discharge-side reverse flow channel section 35 of the flow channel body 31 are configured to reverse the flow direction of the cooling water flowing from the upstream side and to flow it downstream, as described above. Moreover, the inlet-side reverse flow channel section 33 and the discharge-side reverse flow channel section 35 have cross-sectional areas set to be larger than the cross-sectional areas of the inlet-side, intermediate-side and discharge-side circumferential flow channel sections 32, 34 and 36. This makes it possible to suppress an increase in pressure loss when the cooling water passes through the inlet-side reverse flow channel section 33 and the discharge-side reverse flow channel section 35.

[0044] 8(a) and (b) correspond to the flow paths 10 of the above-mentioned Figs. 7(a) and (b), respectively, and show the flow of cooling water. As shown in Figs. 8(a) and (b), when the cooling water is introduced into the inlet flow path section 22a, the cooling water flows along the flow path main body 31 as shown by the arrows, that is, flows through the inlet side circumferential flow path section 32, the inlet side reverse flow path section 33, the intermediate circumferential flow path section 34, the discharge side reverse flow path section 35, and the discharge side circumferential flow path section 36 in this order, and is discharged to the outside from the discharge flow path section 23a. Although not shown, the cooling water discharged to the outside from the discharge flow path section 23a is cooled by a predetermined cooling device, and then circulated so as to be introduced again into the inlet flow path section 22a.

[0045] As described above in detail, according to the motor 1 to which the flow path structure of this embodiment is applied, the flow path main body 31 through which the cooling water flows is provided within the thick wall portion of the frame 5 of the motor 1, extending in a serpentine manner along the axial direction of the frame 5. Therefore, regardless of the installation posture of the motor 1, it is relatively easy compared to the conventional art to keep the flow path main body 31 filled with cooling water, and as a result, the entire motor 1 which generates heat during operation can be appropriately cooled.

[0046] In addition, in the motor 1, the stator 4 engages with the three stator anti-rotation portions 15 of the inner frame 11 via the three engaging protrusions 8, respectively, so that the stator 4 of the motor 1 can be stably installed inside the frame 5 in an unrotatable state. Furthermore, in the frame 5 of the motor 1, by overlapping the outer frame 12 on the inner frame 11 with the inner frame 11 having the groove portion 13a inserted inside the outer frame 12, the flow path main body 31 can be easily formed between the groove portion 13a of the inner frame 11 and the inner circumferential surface of the outer frame 12.

[0047] Furthermore, in the motor 1, by forming the convex flow passage portions 32a, 32b, 34a, 34b, 36a, and 36b that protrude radially outward between the stator anti-rotation portion 15 of the inner frame 11 and the anti-rotation corresponding portion 21 of the outer frame 12, the size of the cross section of the flow passage main body 31 can be kept almost constant without changing significantly around the stator anti-rotation portion 15. This makes it possible to suppress an increase in pressure loss of the cooling water when the cooling water flows through the convex flow passage portions 32a, 32b, 34a, 34b, 36a, and 36b, and ensures a smooth flow of the cooling water.

[0048] Furthermore, the inner frame 11 has a guide surface 13b that guides the cooling water that has flowed in through the inlet flow passage portion 22a to the flow passage main body 31. This guide surface 13b is provided on the outer circumferential surface of the stator anti-rotation portion 15 of the inner frame 11 that corresponds to the cooling water inlet portion 22, and is formed so as to be curved convexly outward in the radial direction. As a result, the cooling water introduced into the inlet flow passage portion 22a is smoothly guided by the guide surface 13b to the inlet-side circumferential flow passage portion 32 of the flow passage main body 31, and as a result, the cooling water can be sent out to the flow passage main body 31 while substantially maintaining the flow rate of the cooling water introduced into the inlet flow passage portion 22a.

[0049] The present invention is not limited to the above-described embodiment, and can be embodied in various forms. For example, in the embodiment, a single intermediate circumferential flow passage section 34 is provided between the inlet-side circumferential flow passage section 32 and the outlet-side circumferential flow passage section 36 in the flow passage body 31, but the present invention is not limited to this, and multiple intermediate circumferential flow passage sections 34 may be provided.

[0050] 9 shows a modified example of the flow path body 31. The flow path body 31A has three intermediate circumferential flow path sections 34, whereas the flow path body 31 has a single intermediate circumferential flow path section 34. The ends of the intermediate circumferential flow path sections 34 communicate with each other via the inverted flow path section 34c. In this manner, the number of intermediate circumferential flow path sections 34 can be appropriately set according to the shape, size, structure, and the like of the motor 1. For example, when the axial length of the motor 1 is relatively short, a single intermediate circumferential flow path section 34 can be set, whereas when the axial length of the motor 1 is relatively long, a plurality of intermediate circumferential flow path sections 34 can be set.

[0051] In the embodiment, the flow path structure of the cooling water in the motor 1 as a rotating machine has been described, but the present invention can also be applied to various rotating machines (such as generators) that generate heat during operation.

[0052] Furthermore, the detailed configurations of the motor 1, the frame 5, and the flow path 10 to which the flow path structure shown in the embodiment is applied are merely examples, and can be appropriately changed within the scope of the present invention. [Explanation of symbols]

[0053] 1. Motor (rotating machine) 2 Shaft 3 Rotor 4 Stator 5 Frame (perimeter wall) 6 Front bracket 7 End bracket 8 Engagement protrusion 10 Flow Path 11 Inner frame 12 Outer frame 13 Frame body 13a Groove 13b Guide surface 15 Stator anti-rotation part 21 Anti-rotation part of outer frame 22 Cooling water inlet 22a Inlet flow passage section (coolant inlet flow passage section) 23 Cooling water discharge part 23a Discharge flow passage section (coolant discharge flow passage section) 31 Flow passage body 32 Circumferential flow passage on the inlet side 33 Inlet side reverse flow channel 34 Intermediate circumferential flow passage 35 Discharge side reverse flow passage section 36 Discharge side circumferential flow passage

Claims

1. A flow path structure for a coolant provided in a cylindrical outer peripheral wall of a rotating machine for cooling the rotating machine, comprising: a flow path main body that is provided within the thick wall portion of the outer peripheral wall and extends in a meandering manner along the axial direction of the outer peripheral wall, through which a coolant flows during cooling; a coolant introduction flow passage portion provided to be connected to one end of the flow passage body and configured to introduce a coolant from the outside into the flow passage body; a cooling liquid discharge flow path portion provided to be connected to the other end of the flow path main body and configured to discharge the cooling liquid in the flow path main body to the outside; Equipped with The flow path body includes: an inlet circumferential flow passage portion extending from the coolant inlet flow passage portion to make approximately one revolution in the circumferential direction of the outer circumferential wall; an inlet-side reversing flow passage portion connected to the inlet-side circumferential flow passage portion and reversing the flow direction of the coolant that has flowed through the inlet-side circumferential flow passage portion; an intermediate circumferential flow passage portion that is connected to the inlet side reverse flow passage portion and extends substantially around the outer circumferential wall; a discharge-side reversing flow passage portion connected to the intermediate circumferential flow passage portion and reversing the flow direction of the cooling liquid that has flowed through the intermediate circumferential flow passage portion so as to guide the cooling liquid to the cooling liquid discharge flow passage portion side; a discharge-side circumferential flow passage portion that is connected to the discharge-side reverse flow passage portion, extends substantially around the outer circumferential wall, and is connected to the coolant discharge flow passage portion; A flow path structure of a coolant in a rotating machine, comprising:

2. 2. The cooling liquid flow path structure in a rotating machine according to claim 1, characterized in that the intermediate circumferential flow path portion is constituted by a single intermediate circumferential flow path portion or by a plurality of intermediate circumferential flow path portions arranged side by side in the axial direction and having end portions connected to each other.

3. The rotating machine includes a cylindrical stator disposed inside the outer circumferential wall, The stator has a plurality of engaging protrusions extending along an axial direction thereof and protruding radially outward, the engaging protrusions being disposed at predetermined angular intervals in a circumferential direction relative to one another, 2. The cooling liquid flow path structure in a rotating machine as described in claim 1, characterized in that the outer peripheral wall extends along an axial direction of the outer peripheral wall and is formed in a convex shape that protrudes radially outward to form a concave shape that opens radially inward, and has a plurality of stator anti-rotation portions with which the plurality of engaging protrusions respectively engage.

4. The outer peripheral wall is an inner frame formed in a cylindrical shape, the stator is attached to an inner peripheral surface side, and a groove portion for forming the flow path main body is formed on an outer peripheral surface side; an outer frame that is formed in a cylindrical shape and that is overlapped with the inner frame in a state in which the inner frame is inserted inside, thereby forming the flow path main body between the groove portion and an inner circumferential surface; 4. The cooling liquid flow path structure in a rotating machine according to claim 3, further comprising:

5. 5. The cooling liquid flow path structure of a rotating machine according to claim 4, wherein portions of the inner frame and the outer frame corresponding to the stator rotation prevention portion are formed in a convex shape protruding radially outward.

6. the cooling liquid inlet passage portion and the cooling liquid outlet passage portion extend in a radial direction of the outer circumferential wall and are provided at positions corresponding to predetermined ones of the plurality of stator anti-rotation portions, 6. The cooling liquid flow path structure of a rotating machine according to claim 5, wherein the inner frame has an outer peripheral surface corresponding to the specified stator anti-rotation portion, the outer peripheral surface being formed so as to be convexly curved radially outward, and the inner frame has a guide surface for guiding the cooling liquid that has flowed in through the cooling liquid inlet flow path portion to the flow path main body.

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