Cooling system for cryogenic storage container and operating method therefor

Abstract

A cryogenic storage container is provided with a storage container, a vacuum container containing the storage container, and a heat shield. The cryogenic storage container is coupled to a cooling source equipped with a cryogenic freezer via transport piping so that the vibration of the cryogenic freezer cannot be directly delivered to the cryogenic storage container. The vibration can be further reduced by providing a bellows unit for transport piping.

1 . A cooling system for a cryogenic storage container including a cryogenic storage container having a storage container storing an object to be cooled as soaked in a coolant, a vacuum container provided around the storage container and forming a vacuum tank between the vacuum container and the storage container, and a heat shield provided in the vacuum tank, wherein coolant piping is fixed to the heat shield, and a coolant passing through the coolant piping is cooled by a cryogenic freezer, comprising:
 a cooling source equipped with the cryogenic storage container; and coolant transport piping for coupling the cooling source to the cryogenic storage container, wherein the coolant cooled by the cryogenic freezer is delivered to the cryogenic storage container through the transport piping.   
     
     
         2 . The cooling system for a cryogenic storage container according to  claim 1 , wherein
 a bellows unit is provided for at least a part of the coolant transport piping.   
     
     
         3 . The cooling system for a cryogenic storage container according to  claim 1 , wherein
 the coolant transport piping is configured by coolant piping for passing a coolant inside, and a vacuum container surrounding the piping, and a bellows unit is provided for at least a part of the vacuum container.   
     
     
         4 . The cooling system for a cryogenic storage container according to  claim 3 , wherein
 the system is fixed to a floor at any portion of the bellows unit provided for the vacuum container in the coolant transport piping.   
     
     
         5 . The cooling system for a cryogenic storage container according to  claim 3 , wherein
 a bellows unit is provided for at least a part of the coolant piping in the coolant transport piping.   
     
     
         6 . The cooling system for a cryogenic storage container according to  claim 1 , wherein:
 the cryogenic storage container has a portion provided with two heat shields and a portion provided with one heat shield between the storage container and the vacuum container;   the cooling source is provided with a second vacuum container which is vacuum inside, the cryogenic freezer attached to the second vacuum container, at least one heat exchange unit provided in the second vacuum container and attached to a coolness generation unit of the cryogenic freezer, at least one counterflow heat exchanger provided in the second vacuum container, and second coolant piping passing a coolant inside;   the heat exchange unit and the counterflow heat exchanger are coupled by the second coolant piping;   the coolant transport piping has third coolant piping passing a coolant inside, and a third vacuum container forming a vacuum tank between the third coolant piping and the third vacuum container; and   coolant piping fixed to the heat shield, the second coolant piping provided for the cooling source, and the third coolant piping in the coolant transport piping are coupled.   
     
     
         7 . The cooling system for a cryogenic storage container according to  claim 6 , wherein
 a vacuum container configuring the cryogenic storage container is coupled to the second vacuum container configuring the cooling source by the third vacuum container configuring the coolant transport piping.   
     
     
         8 . The cooling system for a cryogenic storage container according to  claim 1 , wherein
 the heat shield provided between the storage container and the vacuum container has a divided structure, and the divided heat shields are coupled by a material having lower thermal conductivity than the heat shield.   
     
     
         9 . An operating method for the cooling system for a cryogenic storage container according to  claim 6 , wherein:
 in the two provided heat shields between the storage container and the vacuum container configuring the cryogenic storage container, a heat shield provided on the storage container side is first cooled by a coolant cooled by the cooling source;   the coolant whose temperature has risen by the cooling is used as a low temperature source of the counterflow heat exchanger in the cooling source to perform heat exchange between the temperature-risen coolant and an opposite coolant in the counterflow heat exchanger;   the coolant whose temperature has risen by the heat exchange cools the one provided heat shield between the storage container and the vacuum container; and   the coolant whose temperature has risen by the heat exchange with the one provided heat shield between the storage container and the vacuum container cools a heat shield provided on the vacuum container side in the two provided heat shields between the storage container and the vacuum container.   
     
     
         10 . An operating method for the cooling system for a cryogenic storage container according to  claim 6 , wherein:
 in the two provided heat shields between the storage container and the vacuum container configuring the cryogenic storage container, a heat shield provided on the storage container side is first cooled by a coolant cooled by the cooling source;   the coolant whose temperature has risen by the cooling cools the one provided heat shield between the storage container and the vacuum container;   the coolant whose temperature has risen by the heat exchange with the one provided heat shield between the storage container and the vacuum container is used as a low temperature source of the counterflow heat exchanger in the cooling source and heat exchange is performed between the temperature-risen coolant and an opposite coolant in the counterflow heat exchanger; and   the coolant whose temperature has risen by the heat exchange cools a heat shield provided on the vacuum container side in the two provided heat shields between the storage container and the vacuum container.   
     
     
         11 . A cooling system for a cryogenic storage container, comprising:
 a cryogenic storage container having a storage container storing a coolant and an object to be cooled, a vacuum container provided around the storage container and forming a vacuum tank between the vacuum container and the storage container, and a heat shield provided in the vacuum tank, wherein the heat shield has a portion having two heat shields between the storage container and the vacuum container, and a portion having one heat shield between the storage container and the vacuum container, coolant piping is fixed to each of the two provided heat shields and the one provided heat shield, a different coolant other than the coolant stored in the storage container passes through the coolant piping, and the coolant passing through the coolant piping cools the two provided heat shield and the one provided heat shield;   a cooling source having a second vacuum container which is vacuum inside, a cryogenic freezer provided in the second vacuum container, at least one heat exchange unit provided in the second vacuum container and attached to a coolness generation unit of the cryogenic freezer, at least one counterflow heat exchanger provided in the second vacuum container, and second coolant piping passing a coolant inside, wherein the heat exchange unit is coupled to the counterflow heat exchanger via the second coolant piping; and   transport piping having third coolant piping passing a coolant inside, and a third vacuum container forming a vacuum tank between the third vacuum container and the third coolant piping, wherein   the coolant piping fixed to the heat shield provided in the cryogenic storage container is coupled to the second coolant piping provided in the cooling source via the third coolant piping, and the vacuum container in the cryogenic storage container is coupled to the second vacuum container in the cooling source via the third vacuum container.   
     
     
         12 . An operating method for a cooling system for a cryogenic storage container, comprising:
 a cryogenic storage container having a storage container storing a coolant and an object to be cooled, a vacuum container provided around the storage container and forming a vacuum tank between the vacuum container and the storage container, and a heat shield provided in the vacuum tank, wherein the heat shield has a portion having two heat shields between the storage container and the vacuum container, and a portion having one heat shield between the storage container and the vacuum container, coolant piping is fixed to each of the two provided heat shields and the one provided heat shield, a different coolant other than the coolant stored in the storage container passes through the coolant piping, and the coolant passing through the coolant piping cools the two provided heat shield and the one provided heat shield;   a cooling source having a second vacuum container which is vacuum inside, a cryogenic freezer provided in the second vacuum container, at least one heat exchange unit provided in the second vacuum container and attached to a coolness generation unit of the cryogenic freezer, at least one counterflow heat exchanger provided in the second vacuum container, and second coolant piping passing a coolant inside, wherein the heat exchange unit is coupled to the counterflow heat exchanger via the second coolant piping; and   transport piping having third coolant piping passing a coolant inside, and a third vacuum container forming a vacuum tank between the third vacuum container and the third coolant piping, in which   the coolant piping fixed to the heat shield provided in the cryogenic storage container is coupled to the second coolant piping provided in the cooling source via the third coolant piping, and the vacuum container in the cryogenic storage container is coupled to the second vacuum container in the cooling source via the third vacuum container, wherein:   in the two provided heat shields provided between the storage container and the vacuum container in the coolant storage container, the heat shield provided on the storage container side is first cooled by the coolant cooled by the cooling source;   the coolant whose temperature has risen by the cooling is used as a low temperature source of the counterflow heat exchanger in the cooling source to perform heat exchange between the temperature-risen coolant and an opposite coolant in the counterflow heat exchanger;   the coolant whose temperature has risen by the heat exchange is used in cooling the one provided heat shield between the storage container and the vacuum container; and   using the coolant whose temperature has risen by the heat exchange with the one provided heat shield provided between the storage container and the vacuum container, the heat shield provided on the vacuum container side in the two provided heat shields between the storage container and the vacuum container is cooled.   
     
     
         13 . An operating method for a cooling system for a cryogenic storage container, comprising:
 a cryogenic storage container having a storage container storing a coolant and an object to be cooled, a vacuum container provided around the storage container and forming a vacuum tank between the vacuum container and the storage container, and a heat shield provided in the vacuum tank, wherein the heat shield has a portion having two heat shields between the storage container and the vacuum container, and a portion having one heat shield between the storage container and the vacuum container, coolant piping is fixed to each of the two provided heat shields and the one provided heat shield, a different coolant other than the coolant stored in the storage container passes through the coolant piping, and the coolant passing through the coolant piping cools the two provided heat shield and the one provided heat shield;   a cooling source having a second vacuum container which is vacuum inside, a cryogenic freezer provided in the second vacuum container, at least one heat exchange unit provided in the second vacuum container and attached to a coolness generation unit of the cryogenic freezer, at least one counterflow heat exchanger provided in the second vacuum container, and second coolant piping passing a coolant inside, wherein the heat exchange unit is coupled to the counterflow heat exchanger via the second coolant piping; and   transport piping having third coolant piping passing a coolant inside, and a third vacuum container forming a vacuum tank between the third vacuum container and the third coolant piping, in which   the coolant piping fixed to the heat shield provided in the cryogenic storage container is coupled to the second coolant piping provided in the cooling source via the third coolant piping, and the vacuum container in the cryogenic storage container is coupled to the second vacuum container in the cooling source via the third vacuum container, wherein:   in the two provided heat shields provided between the storage container and the vacuum container in the coolant storage container, the heat shield provided on the storage container side is first cooled by the coolant cooled by the cooling source;   the coolant whose temperature has risen by the cooling cools the one provided heat shield between the storage container and the vacuum container;   the coolant whose temperature has risen by the cooling is used as a low temperature source of the counterflow heat exchanger in the cooling source to perform heat exchange between the temperature-risen coolant and an opposite coolant by the counterflow heat exchanger; and   the coolant whose temperature has risen by the heat exchange cools the heat shield provided on the vacuum container side in the two provided heat shields between the storage container and the vacuum container.