Rotating electrical machine

Abstract

A rotary electric motor includes a housing, a stator, a rotor, an external fan, a motor, an external fan shroud, and an opening / closing member. The external fan is disposed outside the housing to blow air towards the housing. The external fan is housed inside the external fan shroud. The external fan shroud covers the external fan and has a vent that allows communication between the inside and outside of the shroud. The opening / closing member is movable between an open position and a closed position. In the open position, the vent is open; in the closed position, water flow through the vent is restricted while the external fan shroud is submerged. The opening / closing member moves from the open position to the closed position depending on the submersion of the external fan shroud.

Description

Technical Field

[0001] The embodiments described herein generally relate to a rotary electric motor. Background Technology

[0002] Typically, there exists a rotary motor that is installed in a location such as a drainage pumping station and is capable of operating in the air and underwater (e.g., patent document JP6234257B).

[0003] This type of rotary electric motor includes, for example, a housing, a stator and a rotor housed within the housing, an external fan disposed outside the housing, a motor driving the external fan, and an external fan cover for the external fan. The external fan cover is provided with vents.

[0004] When operating in air, air is driven to rotate by an external fan, and air passing through the vents is directed towards the housing through the inside of the external fan shroud. As a result, the housing, as well as the stator and rotor, are cooled by the air.

[0005] On the other hand, in underwater operation, the external fan stops, and the housing, stator, and rotor are cooled by water outside the housing.

[0006] In conventional technology, underwater operations are performed when a rotating motor is submerged in situations such as flooding. However, because water flows through the vents of the outer fan shroud while submerged, foreign objects such as dust can enter the interior of the outer fan shroud, thus contaminating the interior of the outer fan shroud (outer fan or motor).

[0007] One of the problems to be solved by the present invention is to obtain a rotary motor that can prevent foreign objects from entering the outer fan shroud through the vent of the outer fan shroud when the outer fan shroud is submerged. Summary of the Invention

[0008] A rotary electric motor according to one embodiment of the present disclosure includes a housing, a stator, a rotor, an external fan, a motor, an external fan shroud, and an opening / closing member. The stator is housed within the housing. The rotor is partially housed within the housing. The rotor is rotatable about a rotational central axis. The external fan is disposed outside the housing. The external fan is configured to blow air toward the housing. The motor is disposed outside the housing. The motor is configured to drive the external fan. The external fan is housed inside the external fan shroud. The external fan shroud is configured to cover the external fan and is provided with a vent that allows communication between the interior and exterior of the external fan shroud. The opening / closing member is movable between an open position and a closed position, in which the vent is open, and in the closed position, water flow through the vent is restricted while the external fan shroud is submerged. The opening / closing member is configured to move from the open position to the closed position depending on the submersion of the external fan shroud. Attached Figure Description

[0009] Figure 1 This is a schematic cross-sectional view of the rotary electric motor according to the first embodiment; Figure 2 It is a cross-sectional view schematically showing a portion of the cooling device of the rotary electric machine according to the first embodiment, and is a view of the cooling device in the air. Figure 3 It is a cross-sectional view schematically showing a portion of the cooling device of the rotary electric motor of the first embodiment, and is a view of the cooling device in an underwater state; Figure 4 This is a schematic side view showing the opening / closing component of the first embodiment; Figure 5 This is a schematic plan view showing the opening / closing component of the first embodiment; Figure 6 This is a schematic side view showing a portion of the cooling device in a rotary electric motor according to the second embodiment; Figure 7 This is a schematic cross-sectional view of a portion of the cooling device of the rotary motor according to the third embodiment, showing the cooling device underwater. Figure 8 This is a schematic side view of the expander / contractor in the rotary motor of the third embodiment, and a view showing the expander / contractor in an expanded state; Figure 9 This is a schematic side view of the expansion and contraction body in the rotary motor of the third embodiment; Figure 10 This is a schematic side view of the expander / contractor in the rotary motor of the third embodiment, and a view showing the expander / contractor in a contracted state; and Figure 11 This is a side view schematically showing a portion of the cooling device in the rotary electric motor of the fourth embodiment. Detailed Implementation

[0010] Exemplary embodiments of the invention are disclosed below. The construction of the embodiments and the functions and effects obtained by the constructions described below are described as examples. The invention can also be implemented by configurations other than those disclosed in the embodiments below. According to the invention, at least one of various effects (including derivative effects) obtained by this construction can be obtained.

[0011] The accompanying drawings are provided as schematic illustrations and may therefore include illustrations whose dimensional relationships and ratios of the various elements differ from reality. Additionally, the drawings may include illustrations with mutually different dimensional relationships or ratios.

[0012] First Implementation Method Figure 1 This is a schematic cross-sectional view of the rotary motor 1 according to the first embodiment. The rotary motor 1 is a vertical rotary motor and is installed in a location such as a drainage pumping station. The rotary motor 1 is capable of operating in air and underwater. The rotary motor 1 is not limited to this example.

[0013] The rotary motor 1 includes a rotary motor body 2, a cooling device 3, and a junction box 4. The rotary motor body 2 is, for example, a water-resistant motor (waterproof motor). The rotary motor body 2 is not limited to this.

[0014] The main body 2 of the rotary motor includes a stator 11, a rotor 12, a housing 13, a plurality of (two, for example) bearings 15 and a guide cover 23.

[0015] The stator 11 includes a stator core 31 and a stator winding 32. The stator core 31 is formed in a generally cylindrical shape about a rotational central axis Ax. The stator winding 32 passes through a slot provided in the stator core 31 for attachment to the stator core 31.

[0016] The rotation center axis Ax is the center of rotation of the shaft 14 of the rotor 12 in the rotary electric machine 1, and is a virtual straight line passing through the center of the shaft 14. In this embodiment, the rotation center axis Ax extends in the vertical direction. Therefore, the shaft 14 extends in the vertical direction. The axial, radial, and circumferential directions of the rotation center axis Ax are the same as the axial, radial, and circumferential directions of the rotor 12 (shaft 14). In the following description, unless otherwise stated, the axial, radial, and circumferential directions are the axial, radial, and circumferential directions of the rotation center axis Ax, that is, the axial, radial, and circumferential directions of the shaft 14.

[0017] The axial directions include a first axial direction Da1 and a second axial direction Da2. The first axial direction Da1 is a direction along the rotation center axis Ax and is aligned with the downward direction in the vertical direction. The second axial direction Da2 is the opposite direction to the first axial direction Da1 and is aligned with the upward direction in the vertical direction.

[0018] The rotor 12 includes a shaft 14, a rotor core 41, and conductors 42. The shaft 14 is supported by a housing 13 via bearings 15 so that it can rotate about a central axis of rotation Ax. With this configuration, the shaft 14 (rotor 12) can rotate relative to the stator 11 about the central axis of rotation Ax. In this embodiment, the shaft 14 and the central axis of rotation Ax extend in a vertical direction.

[0019] The shaft 14 is formed in a generally cylindrical shape extending along the rotation center axis Ax. The shaft 14 extends through the interior and exterior of the housing 13. The shaft 14 has a base 14a and an outer extension 14b.

[0020] The base 14a is part of the shaft 14 located inside the housing 13. Both ends of the base 14a in the axial direction are supported by bearings 15. With this configuration, the shaft 14 is supported by the bearings 15 so that it can rotate about the rotational central axis Ax.

[0021] The outer extension 14b is part of the shaft 14 and is located outside the housing 13. The outer extension 14b protrudes from the end of the base 14a along a first axial direction Da1 to the outside of the housing 13, exceeding the bearing bracket 53. The outer extension 14b protrudes in the lower direction of the housing 13. Furthermore, a mechanical seal 55 is provided in the portion of the shaft 14 that passes through the housing 13, thereby sealing the portion of the shaft 14 that passes through the housing 13.

[0022] The outer extension 14b is provided with, for example, a flange, keyway, or spline, and is connected to an external device to transmit rotation. With this configuration, the rotary motor 1 outputs torque to or receives torque input from an external device. In one example of this embodiment, the pump impeller is connected to the outer extension 14b.

[0023] The base 14a of the shaft 14 is connected to the rotor core 41. The rotor 12 and the shaft 14 can rotate integrally with respect to the stator 11 about the rotation center axis Ax.

[0024] The rotor core 41 is connected (fixed) to the base 14a of the shaft 14. The rotor core 41 is formed in a generally cylindrical shape about the rotational central axis Ax and is placed within the stator core 31 of the stator 11. Conductors 42 are arranged spaced apart from each other in the circumferential direction. The conductors 42 include, for example, conductor bars that axially penetrate the rotor core 41, and short-circuit rings that axially connect the ends of all conductor bars. The rotor core 41 and conductors 42 rotate integrally with the shaft 14.

[0025] The housing 13 includes a frame 51, two bearing supports 52 and 53, and multiple heat dissipation fins 54. The housing 13 is sealed with a liquid-tight structure. The frame 51 is formed in a generally cylindrical shape around the rotational central axis Ax. The stator 11 and rotor 12 are placed inside the frame 51. The stator core 31 is fixed to the frame 51.

[0026] Bearing bracket 52 is attached to the end of frame 51 in the second axial direction Da2. Bearing bracket 53 is attached to the end of frame 51 in the first axial direction Da1. Bearing brackets 52 and 53 block the space inside frame 51. Bearing brackets 52 and 53 each support a corresponding bearing 15.

[0027] For example, heat dissipation fins 54 protrude from the outer surface of the frame 51 to the outside of the housing 13. The heat dissipation fins 54 are spaced apart in the circumferential direction. Each heat dissipation fin 54 extends substantially in the axial direction. The heat dissipation fins 54 may protrude from the bearing supports 52 and 53 or may extend in other directions.

[0028] Junction box 4 is fixed to frame 51 of housing 13.

[0029] The guide cover 23 covers the end of the housing 13, i.e., the upper end of the housing 13, on the side in the second axial direction Da2. The guide cover 23 includes an end wall 61 and a circumferential wall 62. The guide cover 23 is not limited to this example.

[0030] End wall 61 is located at a position spaced apart from housing 13 along the second axial direction Da2. For example, end wall 61 is formed in a generally disk shape that is substantially orthogonal to the rotation center axis Ax. End wall 61 has a hole 61a. Hole 61a penetrates end wall 61 in the axial direction (i.e., the vertical direction).

[0031] The circumferential wall 62 is formed in a generally cylindrical shape extending from the outer edge of the end wall 61 along a first axial direction Da1. The circumferential wall 62 has a tubular shape around the rotational central axis Ax. The circumferential wall 62 is located outside the upper end of the housing 13 in the radial direction and surrounds the upper end of the housing 13. The circumferential wall 62 is fixed to the housing 13. A channel through which gas (air) can pass is provided in the portion between the circumferential wall 62 and the outer peripheral surface of the upper end of the housing 13.

[0032] Figure 2 It is a cross-sectional view schematically showing a portion of the cooling device 3 of the rotary motor 1 of the first embodiment, and is a view of the cooling device 3 in the air. Figure 3 It is a cross-sectional view schematically showing a portion of the cooling device 3 of the rotary motor 1 of the first embodiment, and is a view of the cooling device 3 in its underwater state.

[0033] like Figures 1 to 3 As shown, the cooling device 3 includes an external fan 101, a motor 102, an external fan cover 111, and an opening / closing member 150. The cooling device 3 is attached to the guide cover 23 of the rotary motor body 2 on the upper side of the guide cover 23. By blowing gas (air) into the rotary motor body 2, the cooling device 3 cools the housing 13, stator 11, and rotor 12 of the rotary motor body 2.

[0034] like Figure 1As shown, the external fan 101 and motor 102 are located outside the housing 13. Specifically, the external fan 101 is positioned outside the housing 13 and above the guide shroud 23. The external fan 101 is driven by the motor 102 to blow air toward the housing 13. The motor 102 receives power supplied from the outside via a cable (not shown). The motor 102 is a water-resistant motor (waterproof motor).

[0035] An external fan shroud 111 is positioned outside the housing 13 and above the guide shroud 23. An external fan 101 and a motor 102 are housed within the external fan shroud 111. The external fan shroud 111 houses the external fan 101 and the motor 102. The external fan shroud 111 has one or more vents 121c. The vents 121c allow communication between the interior and exterior of the external fan shroud 111.

[0036] like Figure 1 As shown, the external fan cover 111 includes an upper member 112 and a lower member 113. The lower member 113 has a cylindrical tubular portion 103 extending in the vertical direction. The lower member 113 covers the external fan 101 and the motor 102. The lower member 113 is disposed on the upper side of the upper member 112 and fixed to the upper member 112. The upper member 112 is provided with the aforementioned vent 121c.

[0037] like Figure 2 As shown, the upper component 112 includes a circumferential wall 121, a lower wall 122, and an upper wall 123.

[0038] The lower wall 122 is disposed on the upper side of the lower member 113 and fixed to the lower member 113. The lower wall 122 is formed in a generally disc shape, for example, generally orthogonal to the rotation center axis Ax. The lower wall 122 has a hole 122a that allows the interior of the upper member 112 and the interior of the lower member 113 to communicate with each other.

[0039] The upper wall 123 is positioned at a distance from the lower wall 122 along the second axial direction Da2. The upper wall 123 is, for example, formed in a generally disk-shaped manner that is approximately orthogonal to the rotation center axis Ax.

[0040] A circumferential wall 121 is disposed above the lower wall 122 and the upper wall 123. The circumferential wall 121 is formed into a generally cylindrical shape extending in a first axial direction Da1 (i.e., the vertical direction). The circumferential wall 121 has a tubular shape about a rotational central axis Ax. The circumferential wall 121 has a vent 121c. The vent 121c penetrates the circumferential wall 121. The circumferential wall 121 includes a lower region 121a and an upper region 121b. The lower region 121a does not have a vent 121c. The upper region 121b has a vent 121c and is positioned above the lower region 121a.

[0041] like Figure 2 and 3As shown, the opening / closing component 150 is housed within the upper component 112 of the outer fan shroud 111. The opening / closing component 150 is configured to be in the open position ( Figure 2 ) and the closed position above the open position ( Figure 3 The open / close member 150 moves between the two positions. The open position is where the vent 121c is open. In the open position, the open / close member 150 does not face the vent 121c. The closed position is the position where water flow through the vent 121c is restricted while the outer fan cover 111 is submerged. In the closed position, the open / close member 150 faces and covers the vent 121c. In the closed position, the open / close member 150 can close the vent 121c. The open / close member 150 is also referred to as a movable member.

[0042] Figure 4 This is a schematic side view of the opening / closing member 150 of the first embodiment. Figure 5 This is a schematic plan view of the opening / closing member 150 of the first embodiment. (See diagram below.) Figures 2 to 5 As shown, the opening / closing component 150 specifically includes a tubular portion 151 and a protrusion 152. In Figure 4 and Figure 5 The illustration of protrusion 152 is omitted in the text.

[0043] The tubular portion 151 has a tubular shape extending in the vertical direction. The tubular portion 151 extends along the circumferential wall 121. The protrusion 152 protrudes from the lower end of the tubular portion 151 toward the interior of the tubular portion 151.

[0044] The opening / closing component 150 is formed of a material, for example, with a specific gravity less than that of water, and therefore receives the buoyancy of water. Examples of materials for the opening / closing component 150 include, but are not limited to, polypropylene (PP), polyethylene (PE), and acrylonitrile butadiene styrene (ABS).

[0045] Using this configuration, the rotary motor 1 operates in the air. During operation in the air, the rotation of the rotor 12 causes the impeller to rotate. During operation in the air, the opening / closing member 150 is in the open position. Figure 2During operation in air, the external fan 101 is driven rotatably by the motor 102, and air outside the external fan shroud 111 enters the interior of the external fan shroud 111 through the vent 121c. Air inside the external fan shroud 111 flows from the upper member 112 to the lower member 113 through the hole 122a, and flows into the interior of the guide shroud 23 through the hole 114a. Air within the guide shroud 23 is guided by the guide shroud 23 to flow along the outer surface of the housing 13. At this time, air flows between the heat dissipation fins 54. The air flowing as described above cools the housing 13, stator 11, and rotor 12. Therefore, the housing 13, stator 11, and rotor 12 are air-cooled.

[0046] When the rotary motor 1 is submerged in an event such as a flood, the opening / closing component 150 moves from the open position to the closed position by buoyancy. Figure 3 Therefore, based on the immersion of the external fan cover 111, the opening / closing member 150 moves from the open position to the closed position. Figure 3 In the example, the external fan cover 111 is submerged in water 300 and located below the water surface 300a, and the foreign object 310 floats in water 300.

[0047] When the rotating motor 1 is underwater, it performs operations underwater. During underwater operation, the rotation of the rotor 12 causes the impeller to rotate. In the event of floods, groundwater in urban areas is discharged into rivers through underwater operation. During underwater operation, the opening / closing component 150 is in the closed position. Figure 3 During operation in air, the external fan 101 is not driven by the motor 102. During underwater operation, the water immersing the exterior of the housing 13 cools the housing 13, as well as the stator 11 and rotor 12. Therefore, the housing 13, stator 11, and rotor 12 are water-cooled.

[0048] When the submersion of the outer fan shroud 111 is detected by, for example, a float sensor (not shown), air operation is manually or automatically switched to underwater operation. Automatic switching is performed by a control device such as a computer based on the detection results from the float sensor. The float sensor may be mounted on or integrated into the opening / closing member 150.

[0049] As described above, the rotary motor 1 of this embodiment includes a housing 13, a stator 11, a rotor 12, an external fan 101, a motor 102, an external fan cover 111, and an opening / closing member 150. The stator 11 is housed in the housing 13. The rotor 12 is housed in the housing 13 and is rotatable about a rotational center axis Ax. The external fan 101 is placed outside the housing 13 and configured to blow air toward the housing 13. The motor 102 is placed outside the housing 13 and configured to drive the external fan 101. The external fan 101 is housed within the external fan cover 111 that covers the external fan 101. The external fan cover 111 is provided with a vent 121c that connects the interior and exterior of the external fan cover 111. The opening / closing member 150 is movable between an open position where the vent 121c is open and a closed position where water flow through the vent 121c is restricted when the external fan cover 111 is submerged. As the external fan cover 111 is submerged, the opening / closing component 150 moves from the open position to the closed position.

[0050] Using the above-described structure, when the outer fan cover 111 is submerged, the opening / closing member 150 moves from the open position to the closed position according to the submersion of the outer fan cover 111, thereby restricting the flow of water through the vent 121c. Therefore, it is possible to prevent foreign objects 310 from entering the outer fan cover 111 through the vent 121c. This reduces the workload of inspection and cleaning of the outer fan cover 111 after the water recedes.

[0051] As the external fan cover 111 is submerged, the opening / closing member 150 moves from the open position to the closed position by the buoyancy acting on the opening / closing member 150.

[0052] The above-described structure does not require the installation of additional components for moving the opening / closing member 150, thus avoiding complicating the structure of the rotary motor 1.

[0053] The external fan shroud 111 includes a circumferential wall 121, which has a vent 121c and a tubular shape extending in the vertical direction. The opening / closing member 150 includes a tubular portion 151 extending along the circumferential wall 121.

[0054] Using the above structure, the vertical movement of the opening / closing member 150 can be guided by the circumferential wall 121.

[0055] In this embodiment, the opening / closing member 150 is housed within the outer fan shroud 111. This allows light, such as sunlight, to be suppressed from reaching the opening / closing member 150. This results in an extended lifespan for the opening / closing member 150.

[0056] Second Implementation Method Figure 6 This is a schematic side view of a portion of the cooling device 3 in the rotary motor 1 according to the second embodiment.

[0057] like Figure 6 As shown, the main difference between this embodiment and the first embodiment is that the opening / closing member 150 includes a floating member 155. The floating member 155 is disposed inside the opening / closing member 150. The floating member 155 is coupled (fixed) to the inner circumferential surface of the opening / closing member 150 so as to move integrally with the opening / closing member 150. The floating member 155 is hollow with internal air and therefore receives buoyancy due to water. The floating member 155 is formed of a material with a specific gravity lower than water. Examples of materials for the floating member 155 include, but are not limited to, polypropylene (PP), polyethylene (PE), and acrylonitrile butadiene styrene (ABS). The material of the opening / closing member 150 can be a material with a specific gravity higher than water. Depending on the immersion of the outer fan cover 111, the floating member 155 moves the opening / closing member 150 from the open position to the closed position by the buoyancy acting on the floating member 155.

[0058] As described above, the rotary motor 1 of this embodiment includes a floating member 155. The floating member 155 is connected to the opening / closing member 150, and moves the opening / closing member 150 from the open position to the closed position by buoyancy depending on the immersion of the outer fan cover 111.

[0059] The above structure can enhance the freedom of selecting the material of the open / close component 150.

[0060] Third Implementation Method Figure 7 This is a cross-sectional view schematically showing a portion of the cooling device 3 of the rotary motor 1 according to the third embodiment, and is a view of the cooling device 3 in an underwater state. Figure 8 This is a schematic side view of the expander / contractor 160 in the rotary motor 1 of the third embodiment, and a view showing the expander / contractor 160 in an expanded state. Figure 9 This is a schematic side view of the expansion and contraction body 160 in the rotary motor 1 of the third embodiment. Figure 10 This is a schematic side view of the expander / contractor 160 in the rotary motor 1 of the third embodiment, and a view showing the expander / contractor 160 in a contracted state.

[0061] like Figures 7 to 10 As shown, the main difference between this embodiment and the first embodiment is that an expansion and contraction body 160 is provided.

[0062] The expandable / contractable body 160 includes a base member 161 and a plurality of (two, for example) opening / closing members 162 and 163. The expandable / contractable body 160 can be in a contracted state (…). Figure 10 ) and expansion state ( Figure 7 and 8 The opening / closing components 162 and 163 expand and contract between the two positions. In the contracted state, the opening / closing components 162 and 163 are in the open position. In the expanded state, the opening / closing components 162 and 163 are in the closed position. Similar to the opening / closing component 150 in the first embodiment described above, the opening / closing components 162 and 163 in the third embodiment move from the open position to the closed position by the buoyancy of the water.

[0063] like Figure 7 As shown, the base member 161 includes a tubular portion 161a and a hook portion 161c. The tubular portion 161a has a tubular shape extending in the vertical direction. The tubular portion 161a extends along the circumferential wall 121. The hook portion 161c protrudes from the upper end of the tubular portion 161a to the outside of the tubular portion 161a.

[0064] The opening / closing member 162 includes a tubular portion 162a and two hook portions 162b and 162c. The tubular portion 162a has a tubular shape extending in the vertical direction. The tubular portion 162a extends along the circumferential wall 121. The hook portion 162b protrudes from the lower end of the tubular portion 162a into the tubular portion 162a. The hook portion 162c protrudes from the upper end of the tubular portion 162a to the outside of the tubular portion 162a.

[0065] The opening / closing member 163 includes a tubular portion 163a and a hook portion 163b. The tubular portion 163a has a tubular shape extending in the vertical direction. The tubular portion 163a extends along the circumferential wall 121. The hook portion 163b protrudes from the lower end of the tubular portion 161a into the tubular portion 162a.

[0066] The tubular portions 161a, 162a, and 163a of the base member 161, the opening / closing member 162, and the opening / closing member 163 have different diameters. The diameter of the tubular portion 162a of the opening / closing member 162 is larger than the diameter of the tubular portion 161a of the base member 161. The diameter of the tubular portion 163a of the opening / closing member 163 is larger than the diameter of the tubular portion 162a of the opening / closing member 162. In the contracted state, the tubular portion 161a of the base member 161 and the tubular portions 162a and 163a of the opening / closing members 162 and 163 overlap each other in an intersecting direction (e.g., a direction orthogonal to the vertical direction) that intersects the vertical direction. Specifically, in the contracted state, the tubular portion 162a of the opening / closing member 162 is located within the tubular portion 163a of the opening / closing member 163, and the tubular portion 161a of the base member 161 is located within the tubular portion 162a of the opening / closing member 162. In the expanded state, among the base member 161, the opening / closing member 162, and the opening / closing member 163, one of the two adjacent tubular portions in the intersecting direction (i.e., one of the tubular portions 161a, 162a, or 163a) protrudes relative to the other tubular portion (i.e., the other tubular portion of the tubular portions 161a, 162a, or 163a). In the expanded state, the hook 162b of the opening / closing member 162 is captured by the hook 161c of the base member 161, and the hook 163b of the opening / closing member 163 is captured by the hook 162c of the opening / closing member 162, thereby stopping the expansion of the expansion and contraction body 160 in the vertical direction.

[0067] As described above, the rotary motor 1 of this embodiment includes an expansion / contraction body 160. The expansion / contraction body 160 includes opening / closing members 162 and 163. The expansion / contraction body 160 can expand and contract between the following states: a contracted state in which the opening / closing members 162 and 163 are in the open position, and an expanded state in which the opening / closing members 162 and 163 are in the closed position.

[0068] Using the above structure, the opening / closing components 162 and 163 can be moved by the expansion and contraction operation of the expansion and contraction body 160.

[0069] The rotary motor 1 includes opening / closing members 162 and 163. The outer fan shroud 111 includes a circumferential wall 121 with a vent 121c. The circumferential wall 121 has a tubular shape extending in the vertical direction. The opening / closing members 162 and 163 each have tubular portions 162a and 163a along the circumferential wall 121. Each tubular portion 162a and 163a of the opening / closing members 162 and 163 has a different diameter. The expansion / contraction body 160 includes opening / closing members 162 and 163. The contracted state is a state in which the tubular portions 162a and 163a of the opening / closing members 162 and 163 overlap in an intersecting direction intersecting the vertical direction. The expanded state is a state in which one of the tubular portions 162a and 163a of the opening / closing members 162 and 163 adjacent to each other in the intersecting direction protrudes relative to the other of the tubular portions 162a and 163a.

[0070] With the above construction, even when the height of the lower region 121a of the circumferential wall 121 of the external fan shroud 111 is lower than the height of the upper region 121b, the vent 121c can be covered (or closed) by the opening / closing members 162 and 163.

[0071] Fourth Implementation Method Figure 11 This is a schematic side view of a portion of the cooling device 3 in the rotary motor 1 according to the fourth embodiment.

[0072] like Figure 11 As shown, the main difference between this embodiment and the third embodiment is that the expansion / contraction body 160 includes floating members 171 and 172. In one example, the floating member 171 is disposed at the upper end of the opening / closing member 163 so as to protrude upward from the upper end. The floating member 171 moves integrally with the opening / closing member 163. The floating member 172 is disposed at the upper end of the opening / closing member 162 so as to protrude upward from the upper end. The floating member 172 moves integrally with the opening / closing member 162.

[0073] Floating components 171 and 172 are hollow with internal air and thus receive buoyancy due to water. Floating components 171 and 172 are formed of a material with a specific gravity less than water. Examples of materials for floating components 171 and 172 include, but are not limited to, polypropylene (PP), polyethylene (PE), and acrylonitrile butadiene styrene (ABS). For example, the materials for opening / closing components 162 and 163 can be materials with a specific gravity greater than water. Depending on the immersion of the outer fan shroud 111, floating components 171 and 172 facilitate the movement of opening / closing components 162 and 163 from the open position to the closed position by the buoyancy acting on floating components 171 and 172.

[0074] As described above, the rotary motor 1 of this embodiment includes floating members 171 and 172. Floating members 171 and 172 are respectively connected to opening / closing members 162 and 163. Depending on the immersion of the outer fan cover 111, the floating members 171 and 172 use buoyancy to move the opening / closing members 162 and 163 from the open position to the closed position.

[0075] The above structure can enhance the freedom of selecting the materials for opening / closing components 162 and 163.

[0076] The opening / closing component (150; 162-163) can be located outside the external fan housing. The opening / closing component (150; 162-163) can be, for example, a louver rotatably supported by a louver shaft. In this case, the louver can be configured to be in an open position during operation in air by airflow generated by the external fan, and in a closed position by gravity during underwater operation. The opening / closing component (150; 162-163) can be configured to move by the driving force of a water-resistant motor. In this case, when the aforementioned float sensor detects immersion of the external fan housing 111, the water-resistant motor can move the opening / closing component (150; 162-163) from the open position to the closed position.

[0077] While certain embodiments have been described, these embodiments are presented by way of example only and are not intended to limit the scope of the invention. In fact, the novel methods and systems described herein can be embodied in various other forms; furthermore, various omissions, substitutions, and changes can be made to the form of the methods and systems described herein without departing from the spirit of the invention. The appended claims and their equivalents are intended to cover these forms or modifications that fall within the scope and spirit of the invention.

Claims

1. A rotary electric motor, comprising: case; The stator is housed within the casing; The rotor is partially housed in the housing, wherein the rotor is rotatable about a central axis of rotation; An external fan is disposed outside the housing, wherein the external fan is configured to blow air toward the housing; A motor is disposed outside the housing, wherein the motor is configured to drive the external fan; An external fan cover, wherein the external fan is placed inside the external fan cover, wherein the external fan cover is configured to cover the external fan and is provided with a vent that allows communication between the interior and exterior of the external fan cover; and An opening / closing component is movable between an open position and a closed position, wherein in the open position the vent is open, and in the closed position the flow of water through the vent is restricted when the outer fan shroud is submerged, wherein the opening / closing component is configured to move from the open position to the closed position according to the submersion of the outer fan shroud.

2. The rotary motor according to claim 1, The opening / closing member is configured to move from the opening position to the closing position by buoyancy acting on the opening / closing member in the submerged state of the outer fan shroud.

3. The rotary motor according to claim 1, further comprising: A floating member is connected to the opening / closing member, wherein the floating member is configured to move the opening / closing member from the opening position to the closing position by buoyancy based on the immersion of the outer fan shroud.

4. The rotary motor according to claim 1, The external fan cover includes a circumferential wall, and the vent is provided in the circumferential wall. The circumferential wall has a tubular shape extending in the vertical direction, and The opening / closing member includes a tubular portion extending along the circumferential wall.

5. The rotary motor according to claim 1, further comprising: An expandable / contractable body, the expandable / contractable body including the opening / closing member, wherein the expandable / contractable body is configured to expand and contract between a contracted state in the open position and an expanded state in the closed position of the opening / closing member.

6. The rotary electric motor according to claim 5, wherein, The opening / closing component consists of a plurality of opening / closing components included in the expansion and contraction body. The external fan shroud includes a circumferential wall, in which the vent is provided, wherein the circumferential wall has a tubular shape extending in the vertical direction. Each of the opening / closing components includes a tubular portion extending along the circumferential wall, and The tubular portions of the opening / closing component have different diameters. The contracted state is the state in which the tubular portions of the opening / closing component overlap in the intersecting direction that intersects with the vertical direction. The expansion state is a state in which one of two adjacent opening / closing members in the intersecting direction protrudes relative to the other of the two adjacent opening / closing members.

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