Flow path structure for cooling liquid in rotating machine

Abstract

The invention provides a flow path structure of cooling liquid in a rotary machine, which can reduce pressure loss of the cooling liquid flowing in the flow path, thereby ensuring smooth flow of the cooling liquid and improving cooling efficiency. A cooling liquid flow path structure for cooling a motor (1), the cooling liquid flow path structure being provided in a cylindrical frame (2) of the motor (1), the cooling liquid flow path structure being provided with: a flow path main body (11) that is provided within a thick portion (2a) of the frame (2) so as to extend while curving in the circumferential direction of the frame (2), the flow path main body allowing a cooling liquid to flow during cooling; and a bypass flow path (12) that is provided so as to extend in the circumferential direction of the frame (2) at one of both end sections in the axial direction of the frame (2), and that communicates with the front-side reversal flow path sections (15, 15) of the frame (2) in the flow path main body (11), the bypass flow path (12) allowing cooling water to flow during cooling, and the bypass flow path (12) being provided so as to extend in the circumferential direction of the frame (2) in one of the end sections in the axial direction of the frame (2). The flow path main body has a plurality of straight flow path sections (14) disposed in the circumferential direction of the frame (2), and a plurality of reverse flow path sections (15, 16) connected to the ends of the straight flow path sections (14).

Description

Technical Field

[0001] The present invention relates to a flow path structure of a cooling liquid for cooling various rotating machines such as a motor and a generator used for driving an electric vehicle, and the like. Background Art

[0002] In the past, as a flow path structure applied to a motor and having a cooling water path for cooling water to flow on its outer peripheral surface, for example, a flow path structure described in Patent Document 1 is known. The motor has a cylindrical frame constituting its outer peripheral wall, and a water jacket having a cooling water path is provided in a manner covering 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 arranged between the outer peripheral wall and the motor frame, extending a predetermined length along the axial direction of the motor and protruding in the radial direction of the motor. These fins are arranged in a state where one end in the longitudinal direction is alternately close to one side and the other side in the axial direction of the motor at a predetermined interval from each other in the circumferential direction of the frame. As a result, a cooling water path is formed on the outer peripheral surface side of the motor frame, which extends while bending along the circumferential direction of the frame.

[0003] In addition, a cooling water inlet and a cooling water outlet are provided on the water jacket at one end portion in the axial direction of the motor in a state of being adjacent to each other in the circumferential direction of the water jacket. In addition, a partition wall is provided on the water jacket between the cooling water inlet and the cooling water outlet, and the partition wall is formed substantially in the same manner as the fin, extends in the entire axial direction of the motor, and partitions the cooling water inlet side and the cooling water outlet side.

[0004] In a motor having a cooling water path configured as described above, when cooling water is sent to a cooling water inlet by a pump or the like, the cooling water flows along the cooling water path, that is, on the outer peripheral surface of the frame of the motor, while bending and moving along the circumference of the frame. Furthermore, after the cooling water has roughly made a circle on the outer peripheral surface of the frame, it is discharged to the outside from the cooling water outlet. In this way, by making the cooling water flow on the outer peripheral surface of the frame of the motor, the heat generated by the rotation of the motor is suppressed by heat exchange with the cooling water, and the motor is cooled more efficiently than an air-cooled type.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Utility Model Publication No. 60-153653 ( Figure 2 ) Summary of the invention

[0008] Problems to be solved by the invention

[0009] In the motor having the above-mentioned cooling water channel, the cooling water channel is configured to extend while bending along the circumference of its frame, and in the cooling water channel, there are a mixture of parts with a large flow path area as a cross section and parts with a small flow path area. That is, the flow path area of ​​the above-mentioned cooling water channel is not uniform, and the flow path area becomes larger or smaller. Therefore, before the cooling water flows from the cooling water inlet to the cooling water outlet, the flow path area of ​​the cooling water channel changes multiple times, and at this time, pressure loss is likely to occur in the cooling water flowing through the cooling water channel. If such pressure loss becomes higher, the smooth flow of the cooling water is hindered, resulting in a decrease in the cooling efficiency of the motor.

[0010] The present invention is made to solve the above-mentioned problems, and its purpose is to provide a flow path structure of coolant in a rotating machine, which can reduce the pressure loss of the coolant flowing in the flow path, thereby ensuring the smooth flow of the coolant and improving the cooling efficiency.

[0011] Means for solving problems

[0012] In order to achieve the above-mentioned purpose, the invention of technical solution 1 is a flow path structure of a coolant, which is arranged on the cylindrical outer wall of a rotating machine and is used to cool the rotating machine. It is characterized in that the flow path structure of the coolant comprises: a flow path main body, which is arranged in the wall thickness portion of the outer wall to extend while bending along the circumferential direction of the outer wall, and the flow path main body is used to allow the coolant to flow during cooling; and a bypass flow path, which is arranged to extend along the circumferential direction of the outer wall at one of the two end portions in the axial direction of the outer wall, and the flow path main body is provided. The parts on the same end side of the outer peripheral wall are connected to each other, and the bypass flow path is used for cooling liquid to flow during cooling. The flow path body comprises: a plurality of straight flow path portions, which extend along the axial direction of the outer peripheral wall and are arranged at predetermined intervals from each other in the circumferential direction of the outer peripheral wall to make the coolant flow in a straight line; and a plurality of reversing flow path portions, which are alternately connected to each other on the two end sides of the outer peripheral wall in the circumferential direction of the outer peripheral wall with respect to the ends on the same side of the adjacent straight flow path portions, so as to reverse the flow direction of the coolant.

[0013] According to this structure, a flow path main body that bends and extends along the circumferential direction of the outer wall is provided in the wall thickness portion of the cylindrical outer wall in the rotating machine. Specifically, the flow path main body that bends and extends along the circumferential direction of the outer wall is composed of the above-mentioned multiple straight flow path portions and multiple reverse flow path portions. As a result, when cooling the rotating machine, the coolant flowing in the flow path main body flows along the flow path main body, that is, through the multiple straight flow path portions and the multiple reverse flow path portions, while bends and flows along the circumferential direction of the outer wall. As a result, the heat generated by the operation of the rotating machine is suppressed by heat exchange with the coolant, and the rotating machine can be cooled more efficiently compared to the air cooling type.

[0014] In addition, a bypass flow path is provided at one of the two ends in the axial direction of the outer peripheral wall of the motor, and the bypass flow path extends along the circumferential direction of the outer peripheral wall, connecting the portions on the same end side of the outer peripheral wall in the flow path body, that is, the reversing flow path portions adjacent to each other in the circumferential direction of the outer peripheral wall. In the flow path body extending while bending along the circumferential direction of the outer peripheral wall, the flow direction of the coolant changes greatly and sharply on the end side of the outer peripheral wall, and therefore, there is a tendency for the pressure loss of the coolant to increase. Therefore, in the present invention, by providing the bypass flow path so as to connect the portions on the same end side of the outer peripheral wall in the flow path body, that is, the reversing flow path portions, when the coolant flows on the end side of the outer peripheral wall in the flow path body, the coolant also flows in the bypass flow path, thereby reducing the pressure loss of the coolant. As a result, compared with the case where the coolant flows in the flow path body without the bypass flow path as described above, the pressure loss of the coolant can be reduced, thereby ensuring the smooth flow of the coolant and improving the cooling efficiency of the rotating machine.

[0015] The invention of Technical Solution 2 is characterized in that, in the flow path structure of the coolant in the rotating machine described in Technical Solution 1, the bypass flow path has a plurality of bypass flow path portions, and the plurality of bypass flow path portions respectively connect the reversing flow path portions adjacent to each other in the circumferential direction of the outer peripheral wall.

[0016] According to this structure, the bypass flow path is formed by connecting the reversing flow path portions adjacent to each other in the circumferential direction of the outer peripheral wall to each other. By having a flow path main body having a straight flow path portion and a reversing flow path portion configured as described above and a flow path structure of a bypass flow path having a plurality of bypass flow path portions, the function and effect of the above-mentioned technical solution 1 can be more effectively achieved.

[0017] The invention of Technical Solution 3 is characterized in that, in the coolant flow path structure in the rotating machine described in Technical Solution 1, a coolant inlet portion for introducing coolant and a coolant discharge portion for discharging coolant are respectively provided in predetermined adjacent straight flow path portions.

[0018] According to this structure, when the coolant is delivered to the coolant inlet, the coolant flows into the straight flow path portion provided with the coolant inlet. Then, starting from the straight flow path portion, the coolant flows along the flow path body, that is, along the circumference of the outer peripheral wall while bending and traveling around the outer peripheral wall, and is discharged from the coolant discharge portion. In this way, by making the coolant flow in the entire circumference of the outer peripheral wall, the entire circumference of the rotating machine can be efficiently cooled.

[0019] The invention of Technical Solution 4 is characterized in that, in the flow path structure of the coolant in the rotating machine described in Technical Solution 3, there is also a connecting flow path, which connects the reversing flow path portion connected to the end of the straight flow path portion provided with the coolant inlet portion and the reversing flow path portion connected to the end of the straight flow path portion provided with the coolant discharge portion.

[0020] According to this structure, the inverted flow path portion connected to the end of the straight flow path portion provided with the coolant inlet portion and the inverted flow path portion connected to the end of the straight flow path portion provided with the coolant discharge portion are connected through a connecting flow path. Thus, through the multiple inverted flow paths on the same end side of the outer peripheral wall in the flow path body, the multiple bypass flow paths of the bypass flow path, and the connecting flow path, a flow path that continuously extends along the circumference of the outer peripheral wall is formed as a whole, that is, a flow path that surrounds the outer peripheral wall. By providing such a flow path together with the flow path body, the pressure loss of the coolant flowing while bending along the flow path body can be effectively reduced.

[0021] The invention of claim 5 is characterized in that, in the flow path structure of the coolant in the rotating machine according to claim 4, the flow path area in the cross section of the connecting flow path is set to be smaller than the flow path area in the cross section of each of the plurality of bypass flow path portions.

[0022] According to this structure, since the flow area in the cross section of the connecting flow path is set to be smaller than the flow area in the cross section of each bypass flow path portion, when the coolant flows, direct flow (backflow) from the coolant inlet portion to the coolant discharge portion through the connecting flow path can be suppressed.

[0023] The invention of Technical Solution 6 is characterized in that, in the flow path structure of the coolant in the rotating machine described in Technical Solution 2, among the multiple reversal flow path sections respectively arranged at the two end portions of the outer peripheral wall, the flow path area in the cross section of the reversal flow path section not connected to the bypass flow path section is set to be larger than the flow path area in the cross section of the reversal flow path section connected to the bypass flow path section.

[0024] According to this structure, since the flow area in the cross section of the reversal flow path portion not connected to the bypass flow path portion is set to be larger than the flow area in the cross section of the reversal flow path portion connected to the bypass flow path portion, the pressure loss of the coolant as a whole can be reduced and the smooth flow of the coolant can be ensured compared to the case where the flow areas of all the reversal flow path portions are the same. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The drawings show a motor to which a coolant flow path structure according to an embodiment of the present invention is applied, wherein (a) is an external perspective view, and (b) is a perspective view showing a cooling water flow path formed in a thick wall portion of a frame.

[0026] Figure 2 Yes Figure 1 (b) is a diagram showing a cooling water flow path in a state where it is expanded in the circumferential direction of the frame.

[0027] Figure 3 It is used to illustrate Figure 2 Diagram of the flow of cooling water in the flow path shown.

[0028] Figure 4 Is expressed as relative to Figure 1 A comparison example of a motor is a diagram of a motor using a cooling water flow path structure in which a bypass flow path and a connecting flow path are omitted, (a) is an appearance stereoscopic diagram, and (b) is a stereoscopic diagram showing the cooling water flow path formed in the wall thickness portion of the frame.

[0029] Figure 5 It means that Figure 4 (b) is a diagram showing a state in which the flow path of cooling water is expanded in the circumferential direction of the frame.

[0030] Figure 6 It is used to illustrate Figure 5 Diagram of the flow of cooling water in the flow path shown. DETAILED DESCRIPTION

[0031] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figure 1 (a) shows the appearance of a motor to which the flow path structure of the coolant according to one embodiment of the present invention is applied. The motor 1 (rotating machine) is used, for example, as a drive motor for an electric vehicle.

[0032] like Figure 1 As shown in (a), the motor 1 includes: a frame 2 (outer peripheral wall) formed in a cylindrical shape, two brackets 3 and 4 respectively connected to the two ends of the frame 2 in the axial direction, a rotor (not shown) rotatably supported by the two brackets 3 and 4 via bearings (not shown), and a shaft 5 that rotates integrally with the rotor and protrudes forward of the bracket 3. In addition, a stator (not shown) is arranged on the inner peripheral surface of the frame 2 between it and the rotor.

[0033] It should be noted that in the following description, Figure 1 The front side of (a), that is, the side where the shaft 5 protrudes, is referred to as the front side, and the opposite side is referred to as the rear side. The brackets 3 and 4 are respectively referred to as the "front bracket 3" and the "rear bracket 4".

[0034] The frame 2 is manufactured by aluminum die casting, for example, and is mostly formed into a cylindrical shape having a predetermined inner diameter and outer diameter and a relatively thick wall portion 2a. In addition, a front flange 6 and a rear flange 7 are provided at the front end and rear end of the frame 2 in the axial direction, respectively, and protrude in the radial direction by a predetermined length. The front flange 6 is provided with a plurality of bolts (in the front bracket 3) for fixing the front bracket 3. Figure 1 (a) shows only four mounting holes 6a. Similarly, the rear flange 7 also has a plurality of holes (in the Figure 1 (a) shows only three mounting holes 7a.

[0035] In addition, a flow path 10 is formed in the thick wall portion 2a of the frame 2 for flowing a predetermined cooling water (coolant) for cooling the motor 1. The flow path 10 has a predetermined depth (a predetermined thickness in the radial direction of the frame 2) and is formed in the thick wall portion 2a in a state of being open to the front and rear of the frame 2. Furthermore, the front bracket 3 and the rear bracket 4 are respectively mounted on the front flange 6 and the rear flange 7 of the frame 2 in a watertight state via annular seals (not shown), thereby constituting the flow path 10.

[0036] Figure 1 (b) The flow path 10 is shown three-dimensionally, Figure 2 The flow path 10 is shown in a state where the flow path 10 is developed in the circumferential direction of the frame 2. As shown in the two figures, the flow path 10 includes: a flow path main body 11 extending while bending along the circumferential direction of the frame 2, a bypass flow path 12 connecting mutually adjacent front side inverted flow path portions 15, 15 described later of the flow path main body 11, and a connecting flow path 13 connecting a first front side inverted flow path portion 15A and a fourth front side inverted flow path portion 15D described later.

[0037] like Figure 1 (b) and Figure 2 As shown, the flow path body 11 has: a plurality of straight flow path portions 14, the plurality of straight flow path portions 14 along the axial direction of the frame 2 (in Figure 2 In the left and right direction) extending in the circumferential direction of the frame 2 (in Figure 2 The cooling water is configured to have a predetermined interval in the vertical direction (in the vertical direction); a plurality of front side inversion flow path portions 15, which are connected to the front ends of the mutually adjacent straight flow path portions 14, 14 to reverse the flow direction of the cooling water; and a plurality of rear side inversion flow path portions 16, which are connected to the rear ends of the mutually adjacent straight flow path portions 14, 14 to reverse the flow direction of the cooling water.

[0038] Specifically, if Figure 2As shown in FIG. 1 , the straight flow path section 14 includes eight straight flow path sections, namely, first to eighth straight flow path sections 14A to 14H. The first to eighth straight flow path sections 14A to 14H all have the same predetermined passage width.

[0039] In addition, the front reversing flow path portion 15 has a front end portion ( Figure 2 The first to fourth front reversing flow path portions 15A to 15D are connected to each other (left end of the third and fourth straight flow path portions 14C and 14D), the front ends of the fifth and sixth straight flow path portions 14E and 14F, and the front ends of the seventh and eighth straight flow path portions 14G and 14H, respectively. These first to fourth front reversing flow path portions 15A to 15D all have the same predetermined channel width Wa.

[0040] Furthermore, the rear inverted flow path portion 16 has a rear end portion ( Figure 2 The three rear inverted flow path sections are composed of the first to third rear inverted flow path sections 16A to 16C, which are connected to the right end of each other, the rear ends of the fourth and fifth straight flow path sections 14D and 14E, and the rear ends of the sixth and seventh straight flow path sections 14F and 14G. These first to third rear inverted flow path sections 16A to 16C all have the same predetermined size of passage width Wb, and the passage width Wb is set to be larger than the passage width Wa of the first to fourth front inverted flow path sections 15A to 15D. Therefore, the flow path area in the cross section of the rear inverted flow path section 16 is larger than the flow path area of ​​the front inverted flow path section 15.

[0041] The bypass flow path 12 is provided to extend along the circumferential direction of the frame 2, and connects the mutually adjacent front side inversion flow path portions 15, 15 to each other. Figure 2 As shown, the bypass flow path 12 has three bypass flow path portions consisting of the first to third bypass flow path portions 12A to 12C that connect the first and second front side inverted flow path portions 15A and 15B, the second and third front side inverted flow path portions 15B and 15C, and the third and fourth front side inverted flow path portions 15C and 15D, respectively. These first to third bypass flow path portions 12A to 12C all have the same predetermined channel width Wc.

[0042] As described above, the communication flow path 13 connects the first front inverted flow path portion 15A and the fourth front inverted flow path portion 15D. The communication flow path 13 has a passage width Wd of a predetermined size, and the passage width Wd is set to be smaller than the passage width Wc of the first to third bypass flow paths 12A to 12C. Therefore, the flow path area in the cross section of the communication flow path 13 is smaller than the flow path area of ​​the first to third bypass flow paths 12A to 12C.

[0043] like Figure 1 As shown in (a), on the frame 2 having the flow path 10 configured as described above, a cooling water introduction portion 17 for introducing cooling water into the flow path 10 and a cooling water discharge portion 18 for discharging cooling water from the flow path 10 are provided. The cooling water introduction portion 17 and the cooling water discharge portion 18 are both formed in a substantially cylindrical shape, and the introduction flow path portion 17a inside the cooling water introduction portion 17 is connected to a predetermined position of the first straight flow path portion 14A of the flow path main body 11, while the discharge flow path portion 18a inside the cooling water discharge portion 18 is connected to a predetermined position of the eighth straight flow path portion 14H of the flow path main body 11.

[0044] Figure 3 10 shows the flow of cooling water in the flow path 10. When cooling water is delivered to the cooling water introduction portion 17 by a pump (not shown) in order to cool the motor 1 in operation, the cooling water flows into the first straight flow path portion 14A of the flow path main body 11 through the introduction flow path portion 17a in the cooling water introduction portion 17. Figure 3 As shown by the thick arrow, the cooling water flows along the flow path main body 11. That is, the cooling water flowing into the flow path main body 11 flows while bending along the circumferential direction of the frame 2. Then, the cooling water reaching the eighth straight flow path portion 14H is discharged to the outside through the discharge flow path portion 18a in the cooling water discharge portion 18.

[0045] In addition, as described above, when the cooling water flows in the flow path main body 11, Figure 3 As shown by thin arrows, a part of the cooling water flowing through the first to third front inverted flow path portions 15A to 15C respectively flows immediately to the downstream front inverted flow path portion 15 through the first to third bypass flow path portions 12A to 12C.

[0046] In the communication flow passage 13 , a part of the cooling water flowing in the fourth front inverting flow passage portion 15D flows toward the first front inverting flow passage portion 15A through the communication flow passage 13 , substantially similarly to the first to third bypass flow passage portions 12A to 12C.

[0047] Here, as a comparative example with respect to the above motor 1, reference is made to the motors 1 and 10 corresponding to the above motors 1 and 10, respectively. Figure 1 to Figure 3 of Figures 4 to 6The flow path structure of cooling water in the motor 1C having a flow path 10C in which the bypass flow path 12 and the connecting flow path 13 are omitted compared to the flow path 10 of the present embodiment will be briefly described. It should be noted that in the following description, the same reference numerals are given to the same structural parts as those in the motor 1 and the flow path 10 described above.

[0048] Figure 4 (a) shows the appearance of the motor 1C, Figure 4 (b) shows a flow path 10C formed in the frame 2 of the motor 1C. Figure 5 The flow path 10C is shown in a state where the flow path 10C is expanded in the circumferential direction of the frame 2. Figure 4 as well as Figure 5 As shown in FIG. 1 , compared with the flow path 10 of the present embodiment, the flow path 10C provided in the frame 2 of the motor 1C has only the flow path main body 11, and does not have the bypass flow path 12 and the communication flow path 13. Therefore, when the cooling water is sent to the flow path 10C, as shown in FIG. Figure 6 As shown, the cooling water flows only along the flow path main body 11 that curves in the circumferential direction of the frame 2 .

[0049] On the other hand, in the flow path 10 of the present embodiment, when the motor 1 is cooled, as described above, Figure 3 As shown, the cooling water flows through the flow path main body 11 of the flow path 10 and also flows through the bypass flow path 12 having the first to third bypass flow path portions 12A to 12C and the communication flow path 13 .

[0050] Thus, according to the present embodiment, the pressure loss of the cooling water flowing in the flow path 10 can be reduced compared to the flow path 10C of the comparative example. It should be noted that, although detailed data is omitted, the results of the simulation analysis of the cooling water flowing in the flow path 10 of the present embodiment and the flow path 10C of the comparative example confirm that the flow rate of the cooling water flowing in the first to third front side inverted flow path portions 15A to 15C of the flow path 10 connected via the first to third bypass flow path portions 12A to 12C is increased compared to the flow rate of the cooling water flowing in the first to third front side inverted flow path portions 15A to 15C of the flow path 10C (that is, the pressure loss of the flow path 10 is reduced compared to the pressure loss of the flow path 10C). Therefore, according to the present embodiment, the pressure loss of the cooling water can be reduced, so that the smooth flow of the cooling water can be ensured, and the cooling efficiency of the motor 1 can be improved.

[0051] In addition, in the flow path 10 of the present embodiment, since the flow path area in the cross section of the communication flow path 13 is set to be smaller than the flow path area of ​​the bypass flow path 12 (the first to third bypass flow path portions 12A to 12C), when the cooling water flows, it is possible to suppress the direct flow (backflow) from the cooling water introduction portion 17 to the cooling water discharge portion 18 via the communication flow path 13. In addition, in the flow path 10, since the flow path area in the cross section of the rear-side reversing flow path portion 16 is set to be larger than the flow path area of ​​the front-side reversing flow path portion 15, the pressure loss of the cooling water can be reduced as the flow path 10 as a whole, and the smooth flow of the cooling water can be ensured, compared with the case where the flow path areas of all the reversing flow path portions 15 and 16 are the same.

[0052] It should be noted that the present invention is not limited to the above-described embodiment, and can be implemented in various ways. For example, in the present embodiment, the bypass flow path 12 and the connecting flow path 13 are provided at the front end side of the frame 2 in the motor 1, but the present invention is not limited thereto, and the bypass flow path 12 and the connecting flow path 13 can also be provided at the rear end side of the frame 2, and the adjacent rear side inverting flow path portions 16, 16 are connected to each other through the bypass flow path 12.

[0053] In addition, in the embodiment, the flow path structure of cooling water in the motor 1 as a rotating machine is described, but the present invention can be applied to various rotating machines (such as generators, etc.) that generate heat during operation. In addition, in the embodiment, the motor 1 is cooled by flowing cooling water in the flow path 10 of the motor 1, but other appropriate coolants (such as cooling oil, etc.) can also be used instead of the above cooling water.

[0054] In addition, the detailed structures of the flow path 10, the flow path main body 11, the bypass flow path 12, and the connecting flow path 13 shown in the embodiment are merely illustrative and can be appropriately changed within the scope of the gist of the present invention. Figure 1 (b) and Figure 2 As shown, three bypass flow paths 12 (first to third bypass flow path portions 12A to 12C) are provided at positions facing each other in the axial direction with respect to all rear inverted flow path portions 16 (first to third rear inverted flow path portions 16A to 16C). However, due to manufacturing reasons, a structure in which the bypass flow paths 12 are reduced to one or two locations may also be adopted. Even in such a case, the effect of reducing the pressure loss of the cooling water can be obtained compared to the above-mentioned flow path 10C which does not have the bypass flow path 12 at all.

[0055] Description of Reference Numerals

[0056] 1 Motor (rotating machine)

[0057] 1C Comparative Example Motor

[0058] 2 Frame (outer wall)

[0059] 2a Thickness of the frame

[0060] 3Front bracket

[0061] 4 rear bracket

[0062] 5-axis

[0063] 6Front flange

[0064] 6a Mounting hole

[0065] 7 Rear flange

[0066] 7a Mounting hole

[0067] 10 flow paths

[0068] 10C Comparative Example Flow Path

[0069] 11Flow path main body

[0070] 12 Bypass flow path

[0071] 12A to 12C First to third bypass flow path portions

[0072] 13 Connecting flow path

[0073] 14 Straight flow path part

[0074] 14A~14H 1st~8th straight flow path part

[0075] 15 front side reversing flow path portion (reversing flow path portion)

[0076] 15A to 15D First to fourth front side inverted flow path portions

[0077] 16 Rear side inverted flow path portion (inverted flow path portion)

[0078] 16A to 16C First to third rear side inverted flow path portions

[0079] 17Cooling water inlet

[0080] 17a Introducing flow path

[0081] 18 Cooling water discharge part

[0082] 18a discharge flow path section

[0083] WaThe passage width of the front inverted flow passage

[0084] Wb The passage width of the rear inverted flow passage

[0085] Wc Passage width of bypass flow path

[0086] Wd is the passage width of the communication flow path.

Claims

1. A cooling liquid flow path structure in a rotating machine, arranged on a cylindrical outer peripheral wall of the rotating machine, for cooling the rotating machine, characterized in that: The flow path structure of the coolant in the rotating machine includes: a flow path body, the flow path body being arranged in the wall thickness portion of the outer peripheral wall so as to extend while bending along the circumferential direction of the outer peripheral wall, the flow path body allowing a coolant to flow during cooling; as well as a bypass flow path, the bypass flow path being arranged to extend along the circumferential direction of the outer peripheral wall at one of the two ends in the axial direction of the outer peripheral wall and to connect the parts of the flow path body on the same end side of the outer peripheral wall with each other, the bypass flow path being used for cooling liquid to flow during cooling, The flow path body has: A plurality of straight flow path portions extending along the axial direction of the outer peripheral wall and arranged at predetermined intervals in the circumferential direction of the outer peripheral wall for allowing the coolant to flow in a straight line; as well as A plurality of reversing flow path portions are alternately connected to each other at the ends of the same side of the mutually adjacent straight flow path portions on both end sides of the outer peripheral wall in the circumferential direction of the outer peripheral wall to reverse the flow direction of the coolant.

2. The flow path structure of the cooling liquid in the rotating machine according to claim 1, characterized in that: The bypass flow path includes a plurality of bypass flow path portions that respectively connect the reversing flow path portions adjacent to each other in the circumferential direction of the outer peripheral wall.

3. The flow path structure of the cooling liquid in the rotating machine according to claim 1, characterized in that: A coolant introduction portion for introducing the coolant and a coolant discharge portion for discharging the coolant are respectively provided in the predetermined straight flow path portions adjacent to each other.

4. The flow path structure of the cooling liquid in the rotating machine according to claim 3, characterized in that: The coolant flow path structure in the rotating machine also includes a connecting flow path, which connects the reversing flow path portion connected to the end of the straight flow path portion provided with the coolant inlet portion and the reversing flow path portion connected to the end of the straight flow path portion provided with the coolant discharge portion.

5. The flow path structure of the cooling liquid in the rotating machine according to claim 4, characterized in that: A flow path area in a cross section of the communication flow path is set to be smaller than a flow path area in a cross section of each of the plurality of bypass flow path portions.

6. The flow path structure of the cooling liquid in the rotating machine according to claim 2, characterized in that: Among the plurality of reversal flow path portions respectively arranged at both ends of the outer peripheral wall, the flow path area in the cross section of the reversal flow path portion not connected to the bypass flow path portion is set larger than the flow path area in the cross section of the reversal flow path portion connected to the bypass flow path portion.

Images