Cooling jacket and cooling unit

Abstract

Provided is an assembled cooling jacket and a cooling unit with excellent tightness and maintainability. The cooling jacket for an electric motor is constituted by connecting a plurality of cooling units in a columnar shape. Each cooling unit has a plate-shaped cooling unit main body, which has a flow path inside for a cooling medium to flow through, and each cooling unit has a socket joint and a spigot joint fixed to the cooling unit main body. By fitting the spigot joint into the socket joint, the cooling unit main bodies are connected to each other. In order to connect the cooling unit main bodies so that they can freely rotate around an axis orthogonal to their connection direction and can be freely assembled and disassembled, the socket joint has an inner surface in a spherical shape or a cylindrical shape, and the spigot joint has an outer surface in a spherical shape or a cylindrical shape suitable for the inner surface of the socket joint to be freely rotatably fitted into the socket joint. In order to communicate the flow paths of the cooling unit main bodies, the socket joint and the spigot joint each have a through hole penetrating through the front and back.

Description

Technical Field

[0001] Embodiments of the present invention relate to a cooling jacket and a cooling unit. Background Art

[0002] When a motor is in operation, the motor generates heat due to internal losses, and the temperature of the motor rises. If the temperature of the motor rises, it is possible to accelerate the deterioration of the insulating material inside the motor, burn out the insulating material, or damage bearings, rectifiers, etc. In order to suppress the rise in the temperature of the motor due to heat generation, a technique of attaching a cooling structure to the outside of the motor is well known. For example, refer to Patent Document 1.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2010-268667

[0006] Regarding the cooling structure for cooling a motor, in order to exert the same high cooling effect on any motor with different external shapes, it is desired to be able to be installed on these motors with high tightness. In addition, in order to improve maintainability and reduce replacement costs, a structure is desired such that even when a failure occurs in a part of the cooling structure, the entire cooling structure is not replaced, but only the failed part is replaced. Furthermore, it is desired that even when there is a deviation in the internal heat distribution of the motor, a cooling structure can be attached to the heat-accumulating part in such a way that the heat-accumulating part has a specific thickness. Summary of the Invention

[0007] One aspect of the present disclosure relates to a motor cooling jacket for cooling a motor. The motor cooling jacket has a plurality of cooling units connected in a row. Each cooling unit has: a plate-shaped cooling unit main body having a flow path inside through which a cooling medium flows; a socket joint mounted on the cooling unit main body so as to protrude from one end of the flow path; and a spigot joint mounted on the cooling unit main body so as to protrude from the other end of the flow path. The cooling unit main bodies are connected to each other by fitting the spigot joint into the socket joint. In order to enable the cooling unit main body to rotate freely about an axis orthogonal to its connection direction and be detachably connected, the socket joint has an inner surface in a spherical shape or a cylindrical shape, and the spigot joint has an outer surface in a spherical shape or a cylindrical shape that fits the inner surface of the socket joint. In order to communicate the flow paths of the cooling unit main bodies, the socket joint and the spigot joint each have a through hole penetrating through the front and back.

[0008] One aspect of the present disclosure relates to a cooling unit that forms a motor cooling jacket for cooling a motor. The cooling unit includes: a plate-shaped cooling unit body having a flow path inside through which a cooling medium flows; a socket joint mounted on the cooling unit body so as to protrude from one end of the flow path; and a spigot joint mounted on the cooling unit body so as to protrude from the other end of the flow path. In order to connect the cooling unit body to another cooling unit, the spigot joint is fitted with the socket joint. In order to enable the cooling unit body to be freely rotatable about an axis orthogonal to the connection direction between the cooling unit and the other cooling unit and to be detachably connected to the other cooling unit, the socket joint has an inner surface in a spherical shape or a cylindrical shape, and the spigot joint has an outer surface in a spherical shape or a cylindrical shape that fits the inner surface of the socket joint. In order to communicate the flow paths of the cooling unit body and the other cooling unit, the socket joint and the spigot joint each have a through hole that penetrates through the front and back.

[0009] According to one aspect, it is possible to provide an assembled cooling jacket with excellent close contact property and maintainability. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a perspective view showing the cooling jacket of the first embodiment.

[0011] Figure 2 is a view showing Figure 1 a usage example of the cooling jacket.

[0012] Figure 3 is a view showing Figure 1 the cooling unit.

[0013] Figure 4 is Figure 3 the front view of the cooling unit.

[0014] Figure 5 is Figure 3 the top view of the cooling unit.

[0015] Figure 6 is Figure 3 the side view of the cooling unit.

[0016] Figure 7 is Figure 3 the exploded view of the cooling unit.

[0017] Figure 8 is Figure 6 the end view taken along line A-A' of

[0018] Figure 9 is an end view showing the connection portion of the cooling unit.

[0019] Figure 10 is Figure 6 the end view of B-B' of

[0020] Figure 11 is a front view showing the state of the cooling unit connected to Figure 3

[0021] Figure 12 is a perspective view showing another usage example of the cooling jacket of Figure 1

[0022] Figure 13 is a front view showing another usage example of the cooling jacket of Figure 1

[0023] Figure 14 is a front view showing a modified example of the cooling unit of Figure 4

[0024] Figure 15 is an end view showing a modified example of the cooling unit of Figure 10

[0025] Figure 16 is a perspective view showing the cooling jacket of the second embodiment

[0026] Figure 17 is a perspective view showing the cooling unit of Figure 16

[0027] Figure 18 is Figure 17 the front view of the cooling unit of

[0028] Figure 19 is a front view showing the state of the cooling unit connected to Figure 17

[0029] Figure 20 is a perspective view showing the cooling jacket of the second embodiment

[0030] Figure 21 is Figure 20 the front view of the cooling jacket of

[0031] Figure 22 is a perspective view showing the cooling unit of Figure 20

[0032] Figure 23 is Figure 22 the top view of the cooling unit of

[0033] Explanation of Reference Numerals

[0034] 1: Cooling jacket, 10: Cooling unit, M: Motor. Detailed Description of the Invention ​​​​​​​​

[0035] Hereinafter, embodiments of the present disclosure will be listed with reference to the accompanying drawings. The cooling jackets of the first embodiment, the second embodiment, and the third embodiment are used to cool the motor. Most of the structures of the cooling jackets of the first embodiment, the second embodiment, and the third embodiment are the same, but the outer shapes of the cooling units constituting the cooling jackets are different from each other. The first embodiment relates to a cooling jacket that can be applied to a motor whose normal outer shape is a prism. The second embodiment relates to a cooling jacket that can be applied to a motor whose normal outer shape is a pyramid. The third embodiment relates to a cooling jacket that can be applied to a motor whose normal outer shape is a cylinder.

[0036] (First Embodiment)

[0037] Hereinafter, Figures 1 to 15 , the cooling jacket of the first embodiment will be described.

[0038] As Figure 1 shown, the cooling jacket 1 of the first embodiment is formed by connecting a plurality of cooling units 10 having the same shape and the same size in a columnar shape. The cooling unit 10 forming one end of the cooling jacket 1 has a refrigerant inlet joint 81, and is connected to a refrigerant supply device outside the motor M via the refrigerant inlet joint 81. The cooling unit 10 forming the other end of the cooling jacket 1 has a refrigerant outlet joint 82, and is connected to a refrigerant treatment device outside the motor M via the refrigerant outlet joint 82. A cooling medium such as a coolant generated by the refrigerant supply device is introduced into the internal flow path of the foremost cooling unit 10 via the refrigerant inlet joint 81, circulates in sequence through the internal flow paths of the plurality of cooling units 10, and is discharged to the refrigerant treatment device via the refrigerant outlet joint 82 of the rearmost cooling unit 10. By causing the cooling medium to flow through the internal flow path of the cooling unit, heat is absorbed from the surface of the motor M to cool the motor M. In addition, the cooling medium flowing in the flow path is not limited to a liquid and may also be a gas.

[0039] As Figure 2 shown, the cooling jacket 1 of the first embodiment can be deformed along the polygonal outer peripheral surface of, for example, a prismatic motor M, and can be in close contact with substantially the entire surface of the outer peripheral surface. By being able to be in close contact with the outer peripheral surface of the motor M, it is expected to improve the cooling effect on the motor M by using the cooling jacket 1.

[0040] As Figure 3 , Figure 6As shown, the cooling unit 10 that constitutes the cooling jacket 1 has a substantially long strip plate shape. Hereinafter, the short axis direction of the cooling unit main body 11 is appropriately used as the X axis, the thickness direction of the cooling unit main body 11 is used as the Y axis, and the long axis direction of the cooling unit main body 11 is used as the Z axis. In addition, the cooling units 10 are connected in a row along the X axis.

[0041] As Figure 4 shown, the cooling unit main body 11 has a substantially Z-shaped shape when viewed from the front. The upper side portion near the center in the long axis direction of the left side surface of the cooling unit main body 11 is recessed to the right to form a step. The lower side portion near the center in the long axis direction of the opposite right side surface is recessed to the left by the same distance to form a step. In this way, steps are formed in opposite directions on the left and right of the cooling unit main body 11. The widths of the step surfaces 11a and 11b of the steps on both the left and right sides are the same, for example, having a width of about 1 / 3 of the overall width of the cooling unit main body 11. By providing steps on the cooling unit main body 11 in opposite directions with the same recessed distance, the steps can be engaged with each other to densely arrange the cooling unit main bodies 11. Since the dense arrangement of the cooling unit main bodies 11 expands the cooling surface, an improvement in the cooling performance of the cooling jacket 1 can be expected. In addition, the step surface 11a on the right side of the cooling unit main body 11 and the step surface 11b on the left side are arranged at positions closer to the center in the long axis direction. Actually, in order to provide a connection space for the joints 15 and 16 described later, the step surfaces 11a and 11b are slightly offset in a direction in which they are separated from each other vertically.

[0042] As Figure 5 shown, both side surfaces of the cooling unit main body 11 are chamfered in an arc shape. The cross section of the cooling unit main body 11 is elliptical. Thereby, the opposing side surfaces of adjacent cooling unit main bodies 11 do not interfere with each other, and free rotation of the cooling unit main bodies 11 can be achieved.

[0043] As Figure 3 、 Figure 7As shown, the stepped surfaces 11a and 11b on the left and right are parallel to the connection direction (X-axis direction) of the cooling unit 10 and the thickness direction (Y-axis direction) of the cooling unit main body 11. In other words, they are formed perpendicular to the major axis direction (Z-axis direction). On the stepped surfaces 11a and 11b on the left and right, a socket joint 15 and a spigot joint 16 are respectively and perpendicularly mounted. Specifically, on one stepped surface 11a, a socket joint insertion hole 13 is formed perpendicular to the stepped surface 11a. The inner surface of the socket joint insertion hole 13 has a thread, and the socket joint 15 is screwed therein. Similarly, on the other stepped surface 11b, a spigot joint insertion hole 14 is formed perpendicular to the stepped surface 11b. The spigot joint 16 is screwed into the spigot joint insertion hole 14. In addition, the socket joint 15 and the spigot joint 16 can also be mounted on the stepped surfaces 11a and 11b on the left and right in a direction inclined with respect to the orthogonal axis, where the orthogonal axis refers to the axis orthogonal to the stepped surfaces 11a and 11b on the left and right. In this case, the direction in which the spigot joint 16 of the cooling unit 10 is mounted to the socket joint 15 is inclined with respect to the axis orthogonal to the connection direction.

[0044] As Figure 7 , Figure 8 , Figure 9 shown, the socket joint 15 has a convex portion 151 with a spherical outer surface. In the spigot joint 16 that receives the convex portion 151, a concave portion 161 with a spherical inner surface that fits the convex portion 151 of the socket joint 15 is provided. The socket joint 15 and the spigot joint 16 form a so-called free joint structure. These socket joint 15 and spigot joint 16 are made of a resin that can be deformed to a certain extent. In addition, the opening 164 of the concave portion 161 is a circular shape narrower than the diameter of the convex portion 151, and is formed in a cross-sectional conical shape with a diameter gradually expanding toward the front. Therefore, the convex portion 151 can be manually inserted into the concave portion 161, and the convex portion 151 can be manually pulled out from the concave portion 161. And when not subjected to strong external force, at least while ensuring rotation around the Z-axis, the fitting state can be maintained. That is to say, as Figure 11 shown, by adopting the side shape of the cooling unit main body 11 and the free joint structure, the cooling jacket 1 can freely bend (turn) around the axis Rz orthogonal to the connection direction.

[0045] According to the joint structure described above, by fitting the socket joint 15 of the cooling unit 10 with the spigot joint 16 of an adjacent cooling unit 10, the cooling units 10 can be connected so that the cooling jacket 1 can freely bend. As Figure 11As shown, the socket joint 15 and the spigot joint 16 of the cooling unit 10 are installed in a direction orthogonal to the connection direction on the unit main body 11, and the socket joint 15 is inserted and fitted into the spigot joint 16 in this direction. Thus, even if a tensile force (external force) along this connection direction (X-axis direction) is applied to the cooling unit 10 for some reason, since this external force is perpendicular to the socket joint 15 and the spigot joint 16, the socket joint 15 will basically not come off from the spigot joint 16. For example, during the process of winding the cooling jacket 1 around the motor M, even when the cooling jacket 1 is stretched, the connection state of the cooling unit 10 can be ensured, so that the workability of installing the cooling jacket 1 on the motor M can be improved. Of course, even if an external force along its thickness direction (Y-axis direction) is applied to the cooling unit 10, since this external force is perpendicular to the socket joint 15 and the spigot joint 16, the socket joint 15 will basically not come off from the spigot joint 16.

[0046] When an external force is applied to a certain cooling unit 10 of the cooling jacket 1 in a direction (Z-axis direction) perpendicular to the connection direction of this cooling unit 10, since this direction is parallel to the direction in which the socket joint 15 is inserted into the spigot joint 16, the socket joint 15 may come off from the spigot joint 16, causing this cooling unit 10 to come off from the cooling jacket 1.

[0047] For example, as Figure 11 shown, assume that for some reason, an external force is applied to the central cooling unit 10 among three adjacent and connected cooling units 10 in a direction (Z-axis direction) perpendicular to the connection direction. These three cooling units 10 are arranged in a manner where the stepped surfaces on the left and right are reversely set and interlock with each other. The central cooling unit 10 is pressed from above by the cooling unit 10 on its left and pressed from below by the cooling unit 10 on its right. Therefore, even if a downward or upward external force is applied to a certain cooling unit 10 in a direction (Z-axis direction) perpendicular to the connection direction, the independent movement of this cooling unit 10 will be pressed by the two adjacent cooling units 10. Thus, it is possible to suppress the cooling unit 10 from coming off in a direction (Z-axis direction) perpendicular to the connection direction.

[0048] As Figure 8 shown, the cooling unit main body 11 has a flow path 12 through which a cooling medium circulates inside. The flow path 12 has a substantially S-shaped configuration that winds up and down, with one end communicating with the socket joint insertion hole 13 formed on the stepped surface 11a and the other end communicating with the spigot joint insertion hole 14 formed on the stepped surface 11b. Since the flow path 12 can be provided over substantially the entire area of the cooling unit main body 11, the entire cooling unit main body 11 can be efficiently cooled by the cooling medium flowing through the flow path 12.

[0049] As Figure 10As shown, generally, the cooling unit main body 11 is formed by joining a first cooling unit main body portion 111 and a second cooling unit main body portion 112 using an adhesive material or the like. The first cooling unit main body portion 111 and the second cooling unit main body portion 112 are obtained by dividing the cooling unit main body 11 into two halves in the thickness direction. On the joint surfaces of the first cooling unit main body portion 111 and the second cooling unit main body portion 112, grooves 121 and 122 that meander in an S shape and are recessed into a semicircular shape are respectively provided. When joining the first cooling unit main body portion 111 and the second cooling unit main body portion 112, the grooves 121 and 122 form a flow path 12 with a circular cross-section. Thus, by directly forming the flow path 12 on the cooling unit main body 11, the cooling medium flowing in the flow path 12 directly exchanges heat between the first cooling unit main body portion 111 and the second cooling unit main body portion 112. Therefore, compared with the case where a separate pipe or the like is built into the cooling unit main body 11 as the flow path 12, the cooling effect of the cooling medium flowing in the flow path 12 can be improved.

[0050] As Figure 8 , Figure 9 shown, in order to connect the flow paths 12 inside adjacent cooling units 10, the socket joint 15 and the spigot joint 16 respectively have through holes 152 and 162 that penetrate through their interiors vertically. As Figure 9 shown, the width of the through hole 152 of the socket joint 15 is slightly narrower than the width of the through hole 162 of the spigot joint 16. Thus, even when the cooling unit 10 rotates slightly about an axis parallel to the Y-axis due to certain reasons, it is possible to prevent the cooling medium flowing in the through hole 152 of the socket joint 15 from directly contacting the inner surface of the spigot joint 16, thereby not obstructing the flow of the cooling medium from the through hole 152 of the socket joint 15 to the through hole 162 of the spigot joint 16. That is, leakage of the cooling medium from the joint portion can be suppressed.

[0051] As Figure 9 shown, in order to prevent leakage of the cooling medium from the joint portion, a sealing material such as a so-called O-ring, which is an annular elastic member, is applied. A circular ring slit 153 is formed on the outer bottom surface of the socket joint 15, and an O-ring 100 is inserted into the slit 153. The O-ring 100 is pressed against the bottom surface of the socket joint insertion hole 13, so that leakage of the cooling medium between the socket joint 15 and the socket joint insertion hole 13 can be suppressed.

[0052] A circular ring slit 163 is provided on the bottom surface of the spigot joint 16, and an O-ring 101 is inserted into the slit 163. The O-ring 101 is pressed against the bottom surface of the spigot joint insertion hole 14. Thereby, leakage of the cooling medium between the spigot joint 16 and the spigot joint insertion hole 14 can be suppressed.

[0053] An annular slit 154 is provided on the outer peripheral surface of the spherical convex portion 151 of the socket joint 15, and an O-ring 102 is embedded in the slit 154. The O-ring 102 is pressed against the inner peripheral surface of the concave portion 161 of the socket joint 16. Thereby, leakage of the cooling medium between the socket joint 15 and the socket joint 16 can be suppressed.

[0054] The cooling jacket 1 of the first embodiment described above is composed of a plurality of cooling units 10, and the plurality of cooling units 10 are connected so as to be freely bent around the Z-axis orthogonal to the connection direction of the cooling units 10, and the cooling jacket 1 can closely contact and wind around the outer surface of the multi-prismatic motor M. By increasing the contact area between the cooling jacket 1 and the motor M, the motor M can be efficiently cooled. In addition, the cooling jacket 1 is of an assembled type, that is, the connection structure between the cooling units is a structure in which they are fitted together through joints, so the number of cooling units 10 constituting the cooling jacket 1 can be easily increased or decreased, and it is possible to flexibly cope with the size of the motor M to be cooled. Moreover, the cooling unit 10 only has a socket joint 15 and a socket joint 16 mounted on the cooling unit main body 11, the number of components is small, and the assemblability is also high. In addition, only the faulty components need to be replaced, so the replacement cost can be suppressed. In addition, as long as the positions and orientations of the socket joint 15 and the socket joint 16 in the cooling unit 10 are the same, cooling units having cooling unit main bodies of different sizes and shapes can be used for the cooling jacket 1. For example, the cooling jacket 1 may include cooling units with the overall width of the cooling unit main body 11 shortened, cooling units with the overall width lengthened, cooling units with the overall length lengthened, and cooling units with the overall length shortened. By configuring the cooling jacket 1 formed by combining a variety of cooling units according to the outer shape of the object to be cooled, the tightness to the object to be cooled can be improved, and the cooling effect can be improved. As long as a variety of cooling units are prepared in advance, the operator can simply assemble on-site a cooling jacket with high cooling effect corresponding to the object to be cooled.

[0055] In addition, as Figure 12 shown, the cooling jacket 1 of the first embodiment can be used with a part folded in the middle in order to arrange the cooling units 10 in double or triple layers on the surface of the part where heat generation is concentrated or the part where heat accumulates.

[0056] In addition, as Figure 13 shown, since the cooling units 10 of the first embodiment are connected to each other so as to be freely rotatable, the shape can be freely changed. Thereby, it can be adapted to various shapes and various sizes of multi-prismatic rotary motors M. Furthermore, it can be freely adapted to other types of motors. For example, as Figure 13 illustrated, the cooling jacket 1 of the first embodiment can also be arranged in a linearly extended form so that it can be mounted on a direct drive motor, that is, a so-called linear motor M1.

[0057] In addition, in the first embodiment, the socket joint 15 has a spherical convex portion 151, and the socket joint 16 has a spherical concave portion 161 for receiving the spherical convex portion 151. However, the cooling jacket 1 is only allowed to rotate about the Z-axis. Therefore, the convex portion 151 of the socket joint 15 can be cylindrical, and the concave portion 161 of the socket joint 16 for receiving the convex portion 151 can have a cylindrical inner surface.

[0058] In addition, from the viewpoints of the replacement cost of the components of the cooling jacket 1 and the assemblability of the cooling jacket 1, it is preferable to fasten and connect the socket joint 15 (socket joint 16) to the socket joint insertion hole 13 (socket joint insertion hole 14) by screw fastening. However, as long as the socket joint 15 (socket joint 16) can be fixed to the socket joint insertion hole 13 (socket joint insertion hole 14) at least, this method is not limited to screw fastening. For example, the socket joint 15 (socket joint 16) can be fixed to the socket joint insertion hole 13 (socket joint insertion hole 14) by adhesion.

[0059] From the viewpoint of ensuring the rigidity of the cooling jacket 1, the connection portion between the cooling unit bodies is preferably near the center of the length. In addition, from the viewpoint of the ease of manufacturing of the cooling jacket 1, the cooling unit body 11 is preferably the object to be rotated. However, this does not deny that the connection portion between the cooling unit bodies is a position shifted upward and downward from the center of the length. That is, the height difference (distance) from the upper end surface of the cooling unit body 11 to the stepped surface 11a may not be equal to the height difference (distance) from the lower end surface to the stepped surface 11b. As Figure 14 shown, for example, the height difference (distance) from the upper end surface of the cooling unit body 11 to the stepped surface 11a can be slightly longer than about 1 / 3 of the total length of the cooling unit body 11, and the height difference (distance) from the lower end surface to the stepped surface 11b can be slightly longer than about 2 / 3 of the total length of the cooling unit body 11.

[0060] The cross-sectional shape of the flow path 12 inside the cooling unit 10 is not limited to a circle. As Figure 15 shown, for example, the cross-sectional shape of the flow path 12 of the cooling unit 10 can be oval. In addition, although not shown, the cross-sectional shape of a part of the flow path 12 can be different from that of other parts. Furthermore, from the viewpoint of cooling the entire cooling unit 10, it is preferable that the planar shape of the flow path 12 is a substantially S-shaped that winds up and down. However, sometimes the cooling unit body 11 does not have to cool the entire contact surface in contact with the motor M, but only a part of the contact surface, or even more preferably a part of the contact surface. In this case, the flow path 12 of the cooling unit 10 can be freely designed, for example, the flow path 12 can be concentrated in the part to be cooled.

[0061] (Second Embodiment)

[0062] Hereinafter, with reference to Figures 16 to 19 , the cooling jacket 2 of the second embodiment will be described. As Figure 16 shown, the cooling jacket 2 of the second embodiment can be deformed into a frustum of a pyramid shape in order to be suitable as a member for cooling the multi-pyramidal motor M. The structural difference between the cooling jacket 1 of the first embodiment and the cooling jacket 2 of the second embodiment lies in the shape of the cooling unit, and the other structures are the same as those of the first embodiment. Therefore, the description of parts other than the cooling unit main body 21 of the cooling unit 20 constituting the cooling jacket 2 of the second embodiment will be omitted.

[0063] As Figure 17 , Figure 18 shown, the cooling unit main body 21 has a conical shape, and its width gradually narrows from the central part of its length to the upper end face. As Figure 19 shown, in a state where the cooling unit main bodies are connected via joints, a gap 29 is generated between the cooling unit main bodies 21 from the connection part to the upper part. This gap 29 allows the cooling unit 20 to slightly rotate around an axis Ry parallel to the thickness direction of the cooling unit 20. Thus, as Figure 16 shown, the cooling jacket 2 can be deformed into a frustum of a pyramid shape in which the upper side is narrower than the lower side.

[0064] The cooling jacket 2 of the second embodiment described above can achieve the same effects as the cooling jacket 1 of the first embodiment. In particular, it can closely adhere to the outer surface of the multi-pyramidal motor M and can efficiently cool the motor M.

[0065] (Third Embodiment)

[0066] Hereinafter, with reference to Figures 20 to 23 , the cooling jacket 3 of the third embodiment will be described. As Figure 20 , Figure 21 shown, the cooling jacket 3 of the third embodiment is suitable as a member for cooling the cylindrical motor M. The structural difference between the cooling jacket 1 of the first embodiment and the cooling jacket 3 of the third embodiment lies in the shape of the cooling unit, and the other structures are the same as those of the first embodiment. Therefore, the description of parts other than the cooling unit main body 31 of the cooling unit 30 constituting the cooling jacket 3 of the third embodiment will be omitted.

[0067] As Figure 22 , Figure 23 shown, the cooling unit main body 31 has a curved plate shape. Therefore, as Figure 21As shown, by adjusting the rotation angle of the cooling unit 30, the inner circumferential surface of the cooling jacket 3 is circular. Thus, the cooling jacket 3 of the third embodiment can achieve the same effect as the cooling jacket 1 of the first embodiment. In particular, the inner circumferential surface of the cooling jacket can be closely attached to the outer circumferential surface of the cylindrical motor M, enabling efficient cooling.

[0068] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are equally included in the invention described in the claims and its equivalents.

Claims

1. A cooling jacket for an electric motor, used for cooling the electric motor. The cooling jacket for the electric motor is characterized in that it has a plurality of cooling units connected in a columnar shape, each of the cooling units has: a plate-shaped cooling unit body having a flow path inside for the cooling medium to flow through, a socket joint installed on the cooling unit body and extending from one end of the flow path, and a spigot joint installed on the cooling unit body and extending from the other end of the flow path; In order to connect the cooling unit bodies to each other, the spigot joint is fitted with the socket joint, In order to connect the cooling unit bodies in such a way that they can freely rotate and be freely assembled and disassembled about an axis orthogonal to the connection direction of the cooling units, the socket joint has an inner surface in the shape of a sphere or a cylinder, and the spigot joint has an outer surface in the shape of a sphere or a cylinder suitable for the inner surface of the socket joint, In order to connect the flow paths of the cooling unit bodies, the socket joint and the spigot joint each have a through hole extending through the front and back.

2. The cooling jacket for an electric motor according to claim 1, characterized in that the socket joint and the spigot joint are respectively installed on the cooling unit body in a direction orthogonal or inclined to the connection direction of the cooling units.

3. The cooling jacket for an electric motor according to claim 1 or 2, characterized in that the cooling unit body is in a stepped shape approximately in the shape of a Z when viewed from the front, and has a pair of stepped surfaces parallel to the connection direction of the cooling units and opposite to each other, the socket joint is vertically installed on one of the pair of stepped surfaces, the spigot joint is vertically installed on the other of the pair of stepped surfaces.

4. The cooling jacket for an electric motor according to claim 1, characterized in that the cooling unit further has an annular elastic member, and the annular elastic member is embedded in the outer peripheral surface of the spigot joint and contacts the inner surface of the socket joint.

5. The cooling jacket for an electric motor according to claim 1, characterized in that both side surfaces of the cooling unit body are in an arc shape, each of the cooling unit bodies is densely arranged in such a way that the side surfaces face the side surfaces of the adjacent cooling unit bodies.

6. The cooling jacket for an electric motor according to claim 1, characterized in that the cooling unit body has a curved plate shape.

7. The cooling jacket for an electric motor according to claim 1, characterized in that the cooling unit body has a conical shape with a width narrowing in a direction orthogonal to the connection direction.

8. A cooling unit, which constitutes a cooling jacket for an electric motor used for cooling the electric motor. The cooling unit is characterized in that it has: a plate-shaped cooling unit body having a flow path inside for the cooling medium to flow through, a socket joint installed on the cooling unit body and extending from one end of the flow path, and a spigot joint installed on the cooling unit body and extending from the other end of the flow path; In order to connect the cooling unit to other cooling units, the spigot joint is fitted with the socket joint, In order to connect the cooling unit to the other cooling unit in such a way that it can freely rotate around an axis orthogonal to the connection direction with the other cooling unit and can be freely loaded and unloaded, the socket joint has an inner surface in the shape of a sphere or a cylinder, and the spigot joint has an outer surface in the shape of a sphere or a cylinder that fits the inner surface of the socket joint. In order to connect the flow paths of the cooling unit body, the socket joint and the spigot joint respectively have through holes that penetrate from front to back.

9. The cooling unit according to claim 8, wherein: The socket joint and the spigot joint are respectively installed on the cooling unit body in a direction orthogonal or inclined to the connection direction of the cooling unit.

10. The cooling unit according to claim 8 or 9, wherein: When viewed from the front, the cooling unit body has a stepped shape that is roughly Z-shaped, and has a pair of stepped surfaces that are parallel to the connection direction of the cooling unit and are opposite to each other. The socket joint is vertically installed on one of the pair of stepped surfaces. The spigot joint is vertically installed on the other of the pair of stepped surfaces.

11. The cooling unit according to claim 8, wherein: The cooling unit further has an annular elastic member, and the annular elastic member is embedded in the outer peripheral surface of the spigot joint and contacts the inner surface of the socket joint.

12. The cooling unit according to claim 8, wherein: Both side surfaces of the cooling unit body are arc-shaped.

13. The cooling unit according to claim 8, wherein: The cooling unit body has a curved plate shape.

14. The cooling unit according to claim 8, wherein: The cooling unit body has a tapered shape in which the width narrows in a direction orthogonal to the connection direction.

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