JP2012110142A - Liquid-cooled type rotary electrical machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid-cooled type (water-cooled type etc.) rotary electrical machinery whose liquid-cooled structure (water-cooled structure etc.) is easy to assemble (encapsulation processing work) comparing to known art in which an annular coolant flow channel (cooling water channel etc.) opened at one end in an axial direction and closed at the other end in the axial direction closed is disposed in a frame.SOLUTION: In a water-cooled type rotary electrical machinery having a water-cooling structure includes an annular cooling water flow channel 11 having an open end 11a at one end in an axial direction and a closed end 11b at the other end in the axial direction in a frame 3 provided at an outer periphery of a stator 1, and the open end 11a is closed with a bracket 4. An end part 11c is made an annular encapsulation part by making a width W1 of the end part 11c on the open end 11a side in the cooling water flow channel 11 wider than a width W2 of an inner part 11d of the end part 11c in the cooling water flow channel 11. Then, a cooling water circulating in the cooling water flow channel 11 can be encapsulated by one annular gasket 8 fitted in the encapsulation part 11c.

Description

  The present invention relates to a liquid-cooled rotary electric machine (an electric motor or a generator).

  As a method of providing a water cooling structure (cooling water flow path) in a rotating electric machine (electric motor or generator), there are conventionally methods such as the following (1) to (3).

(1) Two or more parts of the flow path forming structure are brought into contact to form a cooling water flow path, and the inside of the cooling water flow path is formed by a resin or metal gasket provided in the contact portion or in the vicinity of the contact portion. A method of sealing the circulating cooling water.
(2) A method of forming a cooling water flow path with one component using a casting technique with a hollow core.
(3) An annular coolant flow path in which one of the axial ends is an open end and the other end of the axial direction is closed is provided in the frame by a manufacturing technique such as casting, and the open end is closed with a bracket, and the open A method of sealing the cooling water flowing through the cooling water flow path with a plurality of gaskets (O-rings) provided in the vicinity of the end.

  In addition, the conventional water-cooled rotary electric machine provided with the water-cooling structure by the method (3) is disclosed, for example, in Patent Documents 1 and 2 below.

JP 2009-213209 A JP-A-8-205474

  In the method (1), since the cooling water channel is completed only by combining the flow path forming structure having two or more parts and the sealing process at two or more locations with a gasket or the like, it takes time to form the cooling water channel. Take it. In addition, in the above method (1), the water leakage evaluation is performed only after the cooling water flow path is completed by combining two or more parts of the flow path forming structure and two or more sealing processes using gaskets or the like. Since it cannot be carried out, the evaluation of water leakage is troublesome, and when water leakage is found, any flow path forming structure of two or more flow path forming structures has a cause of water leakage. It may be necessary to disassemble the flow path forming structure of two or more parts in order to determine whether or not, and it takes time to investigate the cause of water leakage.

  In the method (2), the cooling water flow path can be formed with only one component. However, since an advanced casting technique using a hollow core is required, the rotating electrical machine becomes expensive.

  On the other hand, in the method (3), since the flow path forming structure is only one part of the frame, it is easier to form the cooling water flow path than in the method (1), and the water leakage evaluation is performed. It is easy to investigate the cause of water leakage. Further, in the method (3), the cooling water flow path can be formed in the frame by a manufacturing technique such as casting that is easier than the method (2). Therefore, the cost of the rotating electrical machine can be reduced. .

  For this reason, when a water-cooling structure is provided in the rotating electrical machine, an annular coolant flow path with one axial end open and the other axial end closed is formed in the frame as in the method (3) above. Is desirable. However, in the above method (3), it is necessary to use a plurality of gaskets for sealing the cooling water, and accordingly, the work of assembling the water-cooled structure (sealing process work) takes time. This also increases the cost of the rotating electrical machine.

  Therefore, in view of the above circumstances, the present invention forms an annular coolant flow path (cooling water flow path or the like) in the frame in which one axial end is open and the other axial end is closed. It is an object of the present invention to provide a liquid-cooled (water-cooled, etc.) rotating electrical machine that can be easily assembled (sealing process) for a liquid-cooled structure (water-cooled structure, etc.).

The liquid-cooled rotating electrical machine of the present invention that solves the above-described problems is an annular coolant flow path in which one of the axial ends is an open end and the other end of the axial direction is closed on a frame provided on the outer periphery of the stator In a liquid-cooled rotary electric machine having a liquid-cooling structure in which the open end is closed with a bracket,
By making the width of the end portion on the open end side in the coolant channel wider than the width of the inner portion of the end portion in the coolant channel, the end portion becomes an annular sealing portion, The configuration is such that the coolant flowing through the coolant flow path is sealed by one annular gasket fitted in the sealing portion.

  According to the liquid-cooled rotary electric machine of the present invention, the frame provided on the outer periphery of the stator is provided with an annular coolant flow path in which one axial end is an open end and the other axial end is closed, In the liquid-cooled rotary electric machine having a liquid cooling structure in which the open end is closed with a bracket, the width of the end on the open end side in the coolant channel is set to the inside of the end in the coolant channel. A configuration in which the end portion is formed as an annular sealing portion by making the width wider than the width of the portion, and the coolant flowing through the coolant flow path is sealed by one annular gasket fitted into the sealing portion. The following effects can be obtained.

(1) In order to provide an annular coolant flow path in which one axial end is an open end and the other end in the axial direction is closed on a one-part frame (flow path forming structure), two or more parts of the flow path Compared with the case where the forming structure is combined and the case where an advanced casting technique is used, it is easier to form the coolant flow path. Furthermore, since only one gasket for sealing the cooling liquid is required, the assembly work (sealing process work) of the liquid cooling structure is easier than when a plurality of gaskets are used.
(2) Since the coolant flow path is completed with a one-piece frame and one gasket, it is easy to conduct water leak assessments, and even if water leaks are found, there is little rework and the cause of water leaks can be investigated. It can be done in a short time.

(A) is sectional drawing of the water-cooled rotary electric machine which concerns on the embodiment of this invention, (b) is a perspective view of the said water-cooled rotary electric machine. (A) is sectional drawing which extracts and shows the flame | frame of the said water-cooled rotary electric machine (BB sectional view taken on the line of (b)), (b) is a side view of the said frame (A direction arrow of (a)) View). (A) is sectional drawing which extracts and shows the gasket of the said water cooling type rotary electric machine (DD sectional view taken on the line of (b)), (b) is a side view of the said gasket (C direction arrow of (a)) View). (A) is sectional drawing which extracts and shows the flame | frame and gasket of the said water cooling type rotary electric machine (FF sectional view taken on the line of F-F of (b)), (b) is a side view of the said frame and gasket ((a)). E direction arrow view). It is a side view (side view equivalent to Drawing 2 (b)) which extracts and shows a frame and a gasket of a water cooling type rotating electrical machine concerning an embodiment of the present invention, and shows other shape examples of a cooling water channel. FIG. (A) is sectional drawing of the other water-cooled rotary electric machine which concerns on the embodiment of this invention, (b) is a perspective view of the said water-cooled rotary electric machine.

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

  As shown in FIG. 1, a water-cooled rotary electric machine (an electric motor or a generator) according to an embodiment of the present invention includes a stator 1, a rotor 2, a cylindrical frame 3, and a bracket on the anti-connection side. 4, a connection-side bracket 5, an anti-connection-side bearing 6, a connection-side bearing 7, and an annular gasket (O-ring) 8 made of resin or metal.

  The stator 1 includes a cylindrical stator core 1a and a stator coil 1b provided on the stator core 1a. The rotor 2 includes a rotor core 2a, a permanent magnet (not shown) provided on the rotor core 2a, and a rotating shaft 2b fitted on the inner periphery of the rotor core 2a. In the state where the gap g is held between the stator 1 and the stator 1, it is provided inside the stator 1. The rotor 2 may be a rotor core provided with a rotor coil or the like.

  The bracket 4 protrudes on one end side in the axial direction (the axial direction of the rotating shaft 11: the left-right direction in FIG. 1A) on the outer peripheral surface of the frame 3 and the coupling portion 4a protruding on the outer peripheral surface thereof. The coupling portion 3a is fastened to the frame 3 by fastening with a bolt 9, and the rotating shaft 2b of the rotor 2 is rotatably supported via a bearing 6 provided on the inner peripheral portion of the bracket 4.

  The bracket 5 is fastened to the frame 3 by fastening with a bolt 10 a coupling portion 5a projecting on the outer circumferential surface thereof and a coupling portion 3b projecting on the other end side in the axial direction on the outer circumferential surface of the frame 3. The rotating shaft 2b of the rotor 2 is rotatably supported via a bearing 7 that is fixed and provided on the inner peripheral portion of the bracket 5.

  Next, the water cooling structure of the present water-cooled rotary electric machine will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, a cooling water flow path 11 is formed in the frame 3. The cooling water passage 11 is cylindrical and has a circular shape when viewed from the side (FIG. 2A). And as for the cooling water flow path 11, the one end of the said axial direction is the open end 11a, and the other end 11b of the said axial direction is closed. The open end 11 a is closed by the bracket 4. Such a cooling water flow path 1 can be easily formed in the frame 3 by a manufacturing technique such as casting or machining.

  In the case of the illustrated example, the cooling water flow path 11 is not a continuous annular shape in the circumferential direction of the frame 3, but the cooling water inflow portion 11 f on one end side in the circumferential direction and the cooling water outflow on the other end side in the circumferential direction. The part 11g is separated. The cooling water inflow portion 11 f communicates with a cooling water inlet 12 provided on the outer peripheral surface of the frame 3, and the cooling water outflow portion 11 g communicates with a cooling water outlet 13 provided on the outer peripheral surface of the frame 3.

  Accordingly, as indicated by arrows in FIG. 2B, the cooling water flows from the cooling water inflow portion 11f into the cooling water flow channel 11 through the cooling water inlet 12, and the cooling water outflow channel 11 is moved in the circumferential direction. After flowing in the axial direction to cool the stator 1 and the like, it flows out from the cooling water outflow portion 11g through the cooling water outlet 13. In addition, it is not limited to this, The cooling water flow path 11 may be an annular | circular shape continuous in the said circumferential direction. In this case, for example, the cooling water can flow into the cooling water channel 11 on one side in the radial direction of the frame 3 and can flow out from the cooling water channel 11 on the other side in the radial direction.

  As shown in FIGS. 1 and 2, in this embodiment, the width W1 of the end portion 11c on the open end 11a side in the cooling water outflow passage 11 (that is, the radial width: for example, FIG. 2A). The width in the vertical direction) is defined as the width W2 of the inner portion 11d of the end portion 11c (that is, the inner portion of the end portion 11b in the axial direction) of the cooling water outflow passage 11 (ie, the radial width: for example, FIG. By making it wider than the width in the vertical direction of a), the end portion 11c is formed as an annular sealing portion. That is, the step part 11e is formed at the boundary between the sealing part 11c and the inner part 11d. In addition, the sealing part 11c is formed also in the part between the cooling water inflow part 11f and the cooling water outflow part 11g, and is an annular | circular shape continuous in the said circumferential direction.

  Furthermore, as shown in FIG.1 and FIG.4, the one gasket 8 is inserted in the sealing part 11c. As shown in FIGS. 2, 3, and 4, the entire circumferential direction of the annular bracket 8 is fitted into the entire circumferential direction of the annular sealing portion 11 c. This one gasket 8 seals the cooling water flowing through the coolant flow path 11.

  In the illustrated example, the width of the cooling water passage 11 is the same constant width as the width W2 of the inner portion 11d except for the sealing portion 11c in the axial direction, but is not necessarily limited thereto. The width of the cooling water passage 11 may not be constant. That is, the width W1 of the sealing portion 11c only needs to be wider than the width W2 of the portion 11d immediately inside thereof.

  In the above description, the cooling water channel 11 has an annular shape, but the present invention is not limited to this, and the cooling water channel 11 may have an annular shape other than the annular shape. For example, the cooling water channel 11 may have a polygonal shape as shown in FIG. Also in the case of FIG. 5, by making the width of the end portion 11c of the cooling water channel 11 wider than the width of the inner portion 11d, the end portion 11c is formed into an annular sealing portion, and the sealing portion 11c has a 1 One bracket 8 can be fitted to seal the cooling water.

  Further, in the above, the bracket 5 on the other end 11b side of the cooling water flow path 11 is fixed to the frame 3 with the bolt 10, but this is not a limitation, and the bracket 5 and the frame 3 are not limited to this as shown in FIG. It may be integral.

  Further, the cooling water outflow passage 11 has an open end 11a on the opposite side and a closed end 11b on the connection side. However, the present invention is not limited to this, and the open end 11a and the closed end 11b may be reversed. . That is, the cooling water flow path 11 may have an open end 11a on the connection side and a close end 11b on the non-connection side. In this case, the sealing part 11c is provided on the connection side, and the gasket 8 is inserted into the sealing part 11c. In this case, the bracket 4 and the frame 3 on the anti-connection side can be integrated.

  As described above, according to the water-cooled rotating electrical machine of the present embodiment, one of the axial directions is the open end 11a and the other axial end 11b is closed on the frame 3 provided on the outer periphery of the stator 1. In the water-cooled rotary electric machine having a water-cooling structure in which the annular cooling water flow path 11 is provided and the open end 11a is closed by the bracket 4, the width W1 of the end portion 11c on the open end 11a side in the cooling water flow path 11 is By making it wider than the width W2 of the inner portion 11d of the end portion 11c in the cooling water flow path 11, the end portion 11c is formed as an annular sealing portion, and one annular gasket 8 fitted into the sealing portion 11c is used. Since the cooling liquid flowing through the cooling water flow path 11 is sealed, the following effects can be obtained.

(1) In order to provide an annular cooling water flow path 11 in which one axial direction is an open end 11a and the other axial end 11b is closed on one part frame 3 (flow path forming structure), two or more parts The cooling water flow path 11 can be easily formed as compared with the case where the flow path forming structures are combined or when a sophisticated casting technique is used. Furthermore, since only one cooling water sealing gasket 8 is required, the assembly operation (sealing treatment operation) of the water cooling structure is easier than when a plurality of gaskets are used.
(2) Since the coolant flow path 11 is completed with the one-piece frame 3 and one gasket 8, it is easy to conduct a water leak evaluation. Cause investigation can be performed in a short time.

  The present invention relates to a liquid-cooled rotary electric machine, and is useful when applied to the case where a flow path through which a cooling liquid such as cooling water flows is formed in a frame of the rotary electric machine.

DESCRIPTION OF SYMBOLS 1 Stator 1a Stator iron core 1b Stator coil 2 Rotor 2a Rotor iron core 2b Rotating shaft 3 Frame 3a, 3b Coupling part 4 Bracket 4a Coupling part 5 Bracket 5a Coupling part 6,7 Bearing 8 Gasket (O-ring)
9, 10 Volts 11 Cooling water flow path 11a Open end 11b End 11c Sealing part 11d Inner part 11e Step part 11f Cooling water inflow part 11g Cooling water outflow part 12 Cooling water inlet 13 Cooling water outlet 13

Claims (1)

The frame provided on the outer periphery of the stator is provided with an annular coolant flow path in which one axial end is an open end and the other axial end is closed, and the open end is closed by a bracket. In a liquid-cooled rotary electric machine having a structure,
By making the width of the end portion on the open end side in the coolant channel wider than the width of the inner portion of the end portion in the coolant channel, the end portion becomes an annular sealing portion, A liquid-cooled rotary electric machine characterized in that the coolant flowing through the coolant flow path is sealed by one annular gasket fitted in the sealing portion.

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