JP2020200822A - Rotary machine and cooling method for rotary machine - Google Patents

Abstract

To provide a rotary machine capable of suppressing a temperature rise of a liquid to be transferred with a simple configuration.SOLUTION: The rotary machine is configured to include: a drive part 3 that is provided outside a container 2 and performs rotation drive; a rotating shaft 4 that is provided to communicate between the outside and the inside of the container 2 and is rotated by the rotation drive of the drive part 3; a transfer part 5 that is provided inside the container 2, has an impeller 51 rotating together with the rotating shaft 4, and transfers a liquid L by the rotation of the impeller 51; an intermediate heat transfer part 54 that is provided inside the container 2 to cover the outer periphery of the rotating shaft 4; a thermal shield 55 that is provided to cover the transfer part 5 and suppresses heat radiation from the container 2 to the transfer part 5; and a temperature regulation part 6 having a tubular body 61 for circulating a liquid L1 to perform cooling, in which the tubular body 61 is provided adjacent to the intermediate heat transfer part 54 and the thermal shield 55, and the temperatures of the intermediate heat transfer part 54 and the thermal shield 55 are regulated by heat conduction from the intermediate heat transfer part 54 and the thermal shield 55 to the tubular body 61.SELECTED DRAWING: Figure 1

Description

The present invention relates to a rotary machine used for transferring a liquid or the like and a method for cooling the rotary machine.

Conventionally, as a rotary machine, for example, as described in Japanese Patent Application Laid-Open No. 2017-25810, a rotary machine that transfers a low-temperature liquid contained in a container is known. In this rotary machine, a drive motor is arranged outside the container, and a rotary shaft driven by the drive motor is inserted into the container. Then, the impeller attached to the rotating shaft is rotated in the container to transfer the fluid.

Japanese Unexamined Patent Publication No. 2017-25810

In such a rotating machine, it is necessary to provide a heat insulating means so that the temperature of the liquid to be transferred does not rise. For example, in the above-mentioned rotary machine, an intermediate heat transfer portion is formed in the casing between the drive motor and the impeller in order to prevent heat from entering through the casing connected to the outside of the container. That is, by circulating the refrigerant through the piping and cooling the intermediate heat transfer portion to a low temperature state, heat is suppressed from being conducted from the drive motor side outside the container to the impeller side inside the container.

In such a rotating machine, it is conceivable to cover the circumference of the impeller with a shield in order to obtain a more heat insulating effect, and to suppress radiation from the container by this shield. However, a plurality of pipes are required, which complicates the pipe configuration. That is, in order to cool the shield to a low temperature state, a new pipe for cooling the shield is required. In this case, the temperature rise of the liquid to be transferred is effectively suppressed, but a plurality of pipes for circulating the refrigerant are required, which complicates the pipe structure.

Therefore, it is desired to develop a rotating machine and a cooling method for the rotating machine, which can have a simple structure for the piping for circulating the refrigerant while suppressing the temperature rise of the liquid to be transferred.

The rotary machine according to one aspect of the present disclosure is a rotary machine that transfers a liquid inside a heat insulating container so as to cover a rotary shaft, a transfer portion for transferring the liquid, and an outer circumference of the rotary shaft provided inside the heat insulating container. It has an intermediate heat transfer part provided in the above, a shield part provided so as to cover the transfer part, and a cooling body for cooling by flowing a refrigerant, and the cooling body is provided adjacent to the intermediate heat transfer part and the shield part. It is configured to include a temperature control unit. According to this rotating machine, an intermediate heat transfer unit and a temperature adjusting unit that adjusts the temperature of the intermediate heat transfer unit and the shield unit by heat conduction from the shield unit to the cooling body are provided. As a result, the temperature can be adjusted by conducting heat to one cooling body in the plurality of members of the intermediate heat transfer portion and the shield portion. Therefore, it is not necessary to provide a cooling body for temperature adjustment in each of the intermediate heat transfer portion and the shield portion. Therefore, the temperature of the intermediate heat transfer portion and the shield portion can be adjusted with a simple pipe.

Further, in the rotating machine according to one aspect of the present disclosure, a drive unit provided outside the heat insulating container and driven to rotate is further provided, and a rotating shaft is provided so as to communicate with the outside and the inside of the heat insulating container to rotate the drive unit. The transfer part is provided inside the heat insulating container and has an impeller that rotates with the rotation shaft, and the liquid is transferred by the rotation of the impeller, and the shield part is provided so as to cover the transfer part and is provided from the heat insulating container. The heat radiation to the transfer portion may be suppressed, and the temperature adjusting portion may be configured to cool the intermediate heat transfer portion and the shield portion by heat conduction from the intermediate heat transfer portion and the shield portion to the cooling body. Even in this case, it is not necessary to provide a cooling body for temperature adjustment in each of the intermediate heat transfer portion and the shield portion. Therefore, the temperature of the intermediate heat transfer portion and the shield portion can be adjusted with a simple pipe.

Further, in the rotating machine according to one aspect of the present disclosure, the shield portion may be attached to and supported by the transfer portion so as not to be in contact with the wall portion of the heat insulating container. In this case, heat is prevented from entering the shield portion from the heat insulating container due to heat conduction. Therefore, the shield portion can be efficiently cooled.

Further, in the rotary machine according to one aspect of the present disclosure, the heat insulating container may be a vacuum container having a vacuum inside. In this case, by using the heat insulating container as a vacuum container, the heat insulating property of the heat insulating container can be improved.

The cooling method of the rotating machine according to one aspect of the present disclosure is the cooling method of the rotating machine that transfers the liquid inside the heat insulating container. The rotating machine is provided outside the heat insulating container and is driven to rotate, and the heat insulating container. A rotating shaft that is provided so as to communicate with the outside and the inside and rotates by the rotational drive of the drive unit, and a transfer unit that has an impeller provided inside the heat insulating container and rotates together with the rotating shaft and transfers the liquid by the rotation of the impeller. An intermediate heat transfer section provided inside the heat insulating container so as to cover the outer periphery of the rotating shaft, and a shield section provided so as to cover the periphery of the transfer section and suppress heat radiation from the heat insulating container to the transfer section. A cooling body that circulates and cools the refrigerant is provided, and the cooling method of the rotating machine is such that the cooling body is circulated to the cooling body in a state where the cooling body is provided adjacent to the intermediate heat transfer section and the shield portion, and the cooling body is circulated in the middle. The intermediate heat transfer part and the shield part are cooled by heat transfer from the heat transfer part and the shield part to the cooling body. According to the cooling method of this rotating machine, the coolant is circulated through the cooling body in a state where the cooling body is provided adjacent to the intermediate heat transfer section and the shield section, and the heat from the intermediate heat transfer section and the shield section to the cooling body is generated. The intermediate heat transfer part and the shield part are cooled to a preset temperature by conduction. Therefore, the temperature of a plurality of members of the intermediate heat transfer portion and the shield portion can be adjusted by one cooling body. Therefore, it is not necessary to provide a cooling body for temperature adjustment in each of the intermediate heat transfer portion and the shield portion. Therefore, the temperature of the intermediate heat transfer portion and the shield portion can be adjusted with a simple pipe.

According to the invention according to the present disclosure, it is possible to provide a rotary machine capable of suppressing a temperature rise of a liquid to be transferred with a simple configuration.

It is sectional drawing which shows the outline of the rotary machine which concerns on embodiment of this disclosure. It is a horizontal sectional view of II-II in the rotary machine of FIG. It is an enlarged sectional view of the temperature adjustment part in the rotary machine of FIG.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the description of the drawings, the same elements are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a schematic configuration diagram of a rotary machine according to the embodiment of the present disclosure. FIG. 2 is a horizontal cross-sectional view of the rotating machine in II-II of FIG.

As shown in FIG. 1, the rotary machine 1 is a device for transferring a low-temperature liquid L in the container 2, and is installed in the container 2. FIG. 1 shows a case where the rotary machine 1 is applied to a pump that transfers a liquid such as helium, nitrogen, or hydrogen liquefied at an extremely low temperature.

The rotary machine 1 includes a drive unit 3, a rotary shaft 4, and a transfer unit 5. The drive unit 3 is a portion for rotationally driving the rotary shaft 4. For example, as the drive unit 3, an electric motor that is rotationally driven by power supply is used. Specifically, the drive unit 3 includes a rotor 31 and a stator 32. The rotor 31 is attached to the rotating shaft 4 and rotates together with the rotating shaft 4. The stator 32 is arranged around the rotor 31 and is attached so as not to move with respect to the casing 33 of the drive unit 3. The drive unit 3 rotates the rotor 31 and the rotating shaft 4 by supplying electric power. Power is supplied to the drive unit 3 by wiring (not shown).

The drive unit 3 is provided outside the container 2. That is, the drive unit 3 is fixed to the outer surface of the ceiling portion 21 of the container 2. The container 2 is a heat insulating container, for example, a vacuum container capable of creating a vacuum inside. The container 2 functions as a heat insulating container for keeping the liquid L transferred inside at a low temperature. The rotating shaft 4 is arranged, for example, in the vertical direction, and is rotatably supported. For example, the rotating shaft 4 is bearing in the casing 33 and rotatably attached. The rotary shaft 4 is provided so as to communicate the outside and the inside of the container 2, and transmits the rotational power of the drive unit 3 to the transfer unit 5.

The transfer unit 5 is provided inside the container 2. That is, the transfer portion 5 is attached to the inside of the ceiling portion 21 of the container 2 and is provided so as to insert the rotating shaft 4 extending from the drive portion 3. The transfer unit 5 has an impeller 51 that rotates together with the rotation shaft 4. The transfer unit 5 transfers the liquid L by the rotation of the impeller 51. That is, the transfer unit 5 sucks the liquid L from below by the rotation of the impeller 51 and discharges it toward the side. The impeller 51 is attached to the lower end of the rotating shaft 4, for example, and rotates integrally with the rotating shaft 4. The impeller 51 includes an impeller having a plurality of blades, and a known structure can be used. The impeller 51 sucks the liquid L from below by the centrifugal force of the rotating blades and discharges it sideways.

An intermediate heat transfer unit 54 is provided in the casing 53 of the transfer unit 5. The intermediate heat transfer unit 54 is a member for suppressing heat conduction from the drive unit 3 side. The intermediate heat transfer portion 54 is provided so as to cover the outer periphery of the rotating shaft 4. That is, the intermediate heat transfer portion 54 includes a portion corresponding to the outer circumference of the rotating shaft 4 and a portion extending from a portion facing the outer circumference of the rotating shaft 4 to the outer peripheral side. For example, the portion extending to the outer peripheral side is in contact with the temperature adjusting unit 6 described later. The intermediate heat transfer unit 54 is made of a member having thermal conductivity equal to or higher than that of the rotating shaft 4, and is made of, for example, a copper plate. By keeping the intermediate heat transfer unit 54 at a low temperature, it is possible to suppress the ingress of heat from the drive unit 3 side.

A thermal shield 55 is attached to the casing 53 of the transfer unit 5. The thermal shield 55 is provided so as to cover the transfer portion 5, and functions as a shield portion that suppresses heat radiation from the wall portion (including the ceiling portion 21) of the container 2. For example, the thermal shield 55 is formed in a box shape without a bottom surface. The thermal shield 55 may have a shape other than the box shape if it is provided between the wall portion of the container 2 and the transfer portion 5. The thermal shield 55 is attached to the casing 53 of the transfer portion 5 by penetrating the transfer portion 5 through the ceiling surface. The thermal shield 55 covers the transfer portion 5. As a result, the thermal shield 55 prevents the radiant heat H emitted from the ceiling portion 21 of the container 2 from directly hitting the transfer portion 5. Further, the thermal shield 55 is attached to the transfer portion 5 and does not have a member that supports it from below. That is, the thermal shield 55 is attached to the transfer portion 5 and does not contact the wall portion (for example, the bottom portion) of the container 2. Therefore, heat is suppressed from entering the thermal shield 55 from the container 2 due to heat conduction. Therefore, the thermal shield 55 can be cooled efficiently. The shield portion may be provided with a shield member that covers the pipe extending from the transfer portion 5 in addition to the thermal shield 55. For example, a shield member may be provided between the pipe extending from the transfer portion 5 and the bottom portion of the container 2. Thereby, heat radiation from the bottom of the container 2 can be suppressed.

The casing 53 of the transfer unit 5 is provided with a temperature adjusting unit 6. The temperature adjusting unit 6 adjusts the temperature of the intermediate heat transfer unit 54 and the thermal shield 55. That is, the temperature adjusting unit 6 cools the intermediate heat transfer unit 54 and the thermal shield 55 so that the temperatures do not rise. For example, the temperature adjusting unit 6 cools the intermediate heat transfer unit 54 and the thermal shield 55 by circulating a refrigerant. The temperature adjusting unit 6 may adjust the intermediate heat transfer unit 54 and the thermal shield 55 to a preset temperature. The preset temperature may be a temperature set by temperature control or a design temperature. The set temperature is lower than the air temperature and higher than the temperature of the liquid L to be transferred. For example, the set temperature is -200 degrees Celsius.

As shown in FIG. 2, the temperature adjusting unit 6 has a pipe body 61 through which the liquid L1 serving as a refrigerant flows. The tubular body 61 functions as a cooling body for cooling the intermediate heat transfer unit 54 and the thermal shield 55. The tubular body 61 forms a flow path that surrounds the rotating shaft 4. The tubular body 61 is provided in contact with or close to the intermediate heat transfer portion 54. For example, the tube body 61 may be provided in direct contact with the intermediate heat transfer portion 54, or may be provided so as to be heat conductive via a member having high heat transfer property such as copper even if the tube body 61 is not in direct contact with the intermediate heat transfer portion 54. You may. For example, when the intermediate heat transfer portion 54 is formed in a disk shape, the tubular body 61 is formed in an annular shape along the outer edge or the outer periphery of the intermediate heat transfer portion 54. In this case, the intermediate heat transfer unit 54 includes an annular contact surface that contacts from the upper surface to the side surface of the tubular body 61. The inside of the tubular body 61 is a flow path for the liquid L1. Two pipes 62 for circulating the liquid L1 are connected to the pipe body 61. One pipe 62 injects the liquid L1 into the pipe body 61. The other pipe 62 discharges the liquid L1 circulating in the pipe body 61. The pipe 62 is connected to a pump and a cooler, and circulates a liquid L1 having a predetermined temperature.

FIG. 3 is an enlarged cross-sectional view of the temperature adjusting unit 6. As shown in FIG. 3, the tubular body 61 is provided adjacent to the intermediate heat transfer portion 54 and the thermal shield 55. For example, a pipe body 61 is provided at an outer peripheral position of the intermediate heat transfer portion 54. Further, a thermal shield 55 is attached to the outer peripheral position of the pipe body 61. The tubular body 61 may be provided in direct contact with the intermediate heat transfer portion 54 and the thermal shield 55, or may be provided adjacent to the intermediate heat transfer portion 54 and the thermal shield 55 via a member such as a casing 53. May be good. That is, the pipe body 61 may be provided so that the heat of the intermediate heat transfer portion 54 and the thermal shield 55 can be conducted to the pipe body 61.

A mounting portion 55a is formed on the thermal shield 55. The attachment portion 55a is a portion for attaching the thermal shield 55 to the transfer portion 5. The mounting portion 55a is formed by bending the edge of the opening for inserting the transfer portion 5 in the axial direction. That is, the mounting portion 55a is formed in a tubular shape by bending the inner edge of the opening formed in the thermal shield 55 in the axial direction of the rotation axis. By forming the mounting portion 55a, the mounting portion 55a can be fastened together with the transfer portion 5 by a fastener such as a bolt, and the thermal shield 55 can be easily attached to the transfer portion 5.

Further, as the mounting structure of the thermal shield 55, in addition to mounting at the mounting portion 55a, a support member that suspends and supports the thermal shield 55 from the ceiling portion 21 may be used. For example, the upper end of the support member may be attached to the lower surface of the ceiling portion 21, and the thermal shield 55 may be attached to the lower end of the support member. The support member is composed of a rod body, and for example, a plurality of support members are provided. As a result, the mounting structure of the thermal shield 55 becomes strong and is less likely to be damaged.

In FIGS. 1 and 3, the intermediate heat transfer portion 54, the pipe body 61, and the thermal shield 55 are provided at the same position in the axial direction of the rotating shaft 4, and are provided side by side along the radial direction of the rotating shaft 4. Therefore, the tube 61 can absorb the heat of the intermediate heat transfer section 54 and the thermal shield 55, and the intermediate heat transfer section 54 and the thermal shield 55 can be efficiently cooled.

Further, since the tubular body 61 is provided adjacent to the intermediate heat transfer portion 54 and the thermal shield 55, the intermediate heat transfer portion 54 and the thermal shield 55 can be cooled by one tubular body 61. Therefore, it is not necessary to install a cooling body for each of the intermediate heat transfer unit 54 and the thermal shield 55. Therefore, the piping for circulating the refrigerant through the cooling body becomes simple. Further, the rotary machine 1 can be compactly configured.

Next, the operation of the rotary machine 1 and the cooling method of the rotary machine 1 according to the present embodiment will be described.

In FIG. 1, the rotor 31 and the rotating shaft 4 rotate by supplying electric power to the drive unit 3. Power is supplied to the drive unit 3 through wiring or the like (not shown). When the rotation shaft 4 rotates, the impeller 51 of the transfer unit 5 also rotates. The rotation of the impeller 51 gives the liquid L a transfer force. That is, the liquid L is sucked from below in the transfer unit 5, and the liquid L is discharged sideways.

At this time, in order to transfer the low-temperature liquid as the liquid L, the transfer unit 5 of the rotary machine 1 is arranged in the container 2 which is a heat insulating container. Since the temperature of the liquid L is lower than that of the atmosphere outside the container 2, it is required that the temperature of the liquid L does not rise as much as possible due to the transfer of the liquid L.

In the rotary machine 1, an intermediate heat transfer unit 54 is formed on the drive unit 3 side of the impeller 51 in the transfer unit 5. The intermediate heat transfer section 54 is cooled by the tubular body 61. Therefore, the heat generated from the drive unit 3 is absorbed by the intermediate heat transfer unit 54, and heat conduction to the impeller 51 side is suppressed.

Further, the rotary machine 1 is provided with a thermal shield 55 that covers the transfer portion 5. The thermal shield 55 is cooled by the pipe body 61. Therefore, the radiant heat H emitted from the ceiling portion 21 of the container 2 is absorbed by the thermal shield 55. Therefore, it is possible to prevent the temperature of the transfer unit 5 from rising due to the radiant heat H.

Here, the intermediate heat transfer section 54 and the thermal shield 55 are cooled by the tubular body 61. Refrigerant is injected into the pipe body 61 through the pipe 62. The refrigerant circulates in the pipe body 61 and is discharged from the pipe body 61 by the pipe 62. As a result, the pipe body 61 becomes a low temperature state, and the intermediate heat transfer portion 54 and the thermal shield 55 are cooled by the pipe body 61.

At this time, as shown in FIG. 3, the pipe body 61 is provided adjacent to the intermediate heat transfer portion 54 and the thermal shield 55, so that the intermediate heat transfer portion 54 and the thermal shield 55 are cooled by one pipe body 61. can do.

On the other hand, it is conceivable to provide cooling bodies for the intermediate heat transfer unit 54 and the thermal shield 55, respectively. In this case, two cooling bodies are required, and it is necessary to install piping for circulating the refrigerant to each of them. Therefore, the piping structure becomes complicated. Therefore, in the rotary machine 1 according to the present embodiment, by providing the pipe body 61 adjacent to the intermediate heat transfer portion 54 and the thermal shield 55, the intermediate heat transfer portion 54 and the thermal shield 55 are provided by one pipe body 61. It is cooling at the same time. Therefore, the piping for circulating the refrigerant can be simply configured. Further, since the number of pipes can be reduced, the size of the rotary machine 1 can be reduced.

As described above, according to the rotary machine 1 according to the present embodiment, the temperature of the intermediate heat transfer unit 54 and the thermal shield 55 is adjusted by heat conduction from the intermediate heat transfer unit 54 and the thermal shield 55 to the pipe body 61. The temperature adjusting unit 6 is provided. As a result, the temperature can be adjusted by conducting heat to one tube 61 in the plurality of members of the intermediate heat transfer section 54 and the thermal shield 55. Therefore, it is not necessary to provide the pipe body 61 for temperature adjustment to the intermediate heat transfer portion 54 and the thermal shield 55, respectively. Therefore, the temperature of the intermediate heat transfer unit 54 and the thermal shield 55 can be adjusted with a simple pipe.

Further, the rotary machine 1 according to the present embodiment is configured such that the thermal shield 55 is attached to and supported by the transfer portion 5 and does not come into contact with the wall portion of the container 2. Therefore, heat is suppressed from entering the thermal shield 55 from the container 2 due to heat conduction. Therefore, the thermal shield 55 can be cooled efficiently.

Further, in the rotary machine 1 according to the present embodiment, the container 2 is a vacuum container having a vacuum inside. As a result, the heat insulating effect is enhanced by the container 2.

According to the cooling method of the rotating machine 1 according to the present embodiment, the liquid L1 is circulated in the tubular body 61 in a state where the tubular body 61 is provided adjacent to the intermediate heat transfer portion 54 and the thermal shield 55, and the intermediate heat transfer is performed. The intermediate heat transfer section 54 and the thermal shield 55 can be cooled by heat conduction from the section 54 and the thermal shield 55 to the tube 61. That is, one tube 61 makes it possible to adjust the temperature of a plurality of members of the intermediate heat transfer portion 54 and the thermal shield 55. Therefore, it is not necessary to provide a cooling body for temperature adjustment in the intermediate heat transfer unit 54 and the thermal shield 55, respectively. Therefore, the temperature of the intermediate heat transfer unit 54 and the thermal shield 55 can be adjusted with a simple pipe.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. The present invention can be implemented in various modifications without departing from the gist of the claims.

For example, in the above-described embodiment, the container 2 of the rotary machine 1 is vacuum-insulated, but it may be insulated by another method.

Further, in the above-described embodiment, the case where the rotary machine 1 is applied to the pump for transferring the low temperature liquid L has been described, but the rotary machine 1 may be applied to other devices and the like.

1 Rotating machine 2 Container (insulated container)
3 Drive unit 4 Rotating shaft 5 Transfer unit 6 Temperature control unit 21 Ceiling unit 31 Rotor 32 Stator 51 Impeller 53 Casing 54 Intermediate heat transfer unit 55 Thermal shield (shield unit)
61 Tube (cooling body)
62 Piping L Liquid L1 Liquid (refrigerant)
H radiant heat

Claims (5)

In a rotating machine that transfers liquid inside a heat insulating container
The axis of rotation and
A transfer unit that transfers the liquid and
An intermediate heat transfer unit provided inside the heat insulating container and covering the outer circumference of the rotating shaft,
A shield portion provided so as to cover the transfer portion and
A temperature control unit having a cooling body that circulates a refrigerant for cooling, and the cooling body is provided adjacent to the intermediate heat transfer unit and the shield unit.
A rotating machine equipped with. Further provided with a drive unit provided outside the heat insulating container and driven to rotate,
The rotation shaft is provided so as to communicate the outside and the inside of the heat insulating container, and is rotated by the rotation drive of the drive unit.
The transfer unit has an impeller provided inside the heat insulating container and rotates together with the rotation shaft, and the liquid is transferred by the rotation of the impeller.
The shield portion is provided so as to cover the transfer portion, and suppresses heat radiation from the heat insulating container to the transfer portion.
The temperature adjusting unit cools the intermediate heat transfer unit and the shield unit by heat conduction from the intermediate heat transfer unit and the shield unit to the cooling body.
The rotating machine according to claim 1. The shield portion is attached to and supported by the transfer portion and does not contact the wall portion of the heat insulating container.
The rotating machine according to claim 1 or 2. The heat insulating container is a vacuum container having a vacuum inside.
The rotary machine according to any one of claims 1 to 3. In the cooling method of a rotating machine that transfers liquid inside a heat insulating container,
The rotating machine
A drive unit provided outside the heat insulating container and driven to rotate,
A rotating shaft provided so as to communicate with the outside and the inside of the heat insulating container and rotating by rotational driving of the driving unit,
A transfer unit provided inside the heat insulating container and having an impeller that rotates together with the rotation shaft and that transfers the liquid by the rotation of the impeller.
An intermediate heat transfer unit provided inside the heat insulating container and covering the outer circumference of the rotating shaft,
A shield portion provided so as to cover the periphery of the transfer portion and suppressing heat radiation from the heat insulating container to the transfer portion.
It is equipped with a cooling body that circulates a refrigerant to cool it.
The cooling method of the rotary machine is
The refrigerant is circulated through the cooling body in a state where the cooling body is provided adjacent to the intermediate heat transfer portion and the shield portion, and heat conduction from the intermediate heat transfer portion and the shield portion to the cooling body is performed. Cooling the intermediate heat transfer section and the shield section,
How to cool a rotating machine.

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