Helium management control system
First Claim
1. A cryopump, comprising:
- a cryopanel;
a cryogenic refrigerator which is configured to cool the cryopanel, the cryogenic refrigerator including a drive motor configured to drive the cryogenic refrigerator, the cryogenic refrigerator being coupled to at least one compressor configured to supply a refrigerant, the at least one compressor including a high pressure supply line and a low pressure exhaust line; and
a controller to control consumption of the refrigerant in the cryogenic refrigerator during a cooling operation bringing the temperature of the cryogenic refrigerator down to operating temperature by varying the speed of the drive motor based on a differential pressure between the high pressure supply line and the low pressure exhaust line of the cryogenic refrigerator.
4 Assignments
0 Petitions
Accused Products
Abstract
A helium management control system for controlling the helium refrigerant supply from a common manifold supplies cryogenic refrigerators with an appropriate helium supply. The system employs sensors to monitor and regulate the overall refrigerant supply to deliver an appropriate refrigerant supply to each of the cryogenic refrigerators depending on the computed aggregate cooling demand of all of the cryogenic refrigerators. An appropriate supply of helium is distributed to each cryopump by sensing excess and sparse helium and redistributing refrigerant accordingly. If the total refrigeration supply exceeds the demand, or consumption, excess refrigerant is directed to cryogenic refrigerators which can utilize the excess helium to complete a current cooling function more quickly. If the total refrigeration demand exceeds the total refrigeration supply, the refrigerant supply to some or all of the cryogenic refrigerators will be reduced accordingly so that detrimental or slowing effects are minimized based upon the current cooling function.
63 Citations
20 Claims
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1. A cryopump, comprising:
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a cryopanel; a cryogenic refrigerator which is configured to cool the cryopanel, the cryogenic refrigerator including a drive motor configured to drive the cryogenic refrigerator, the cryogenic refrigerator being coupled to at least one compressor configured to supply a refrigerant, the at least one compressor including a high pressure supply line and a low pressure exhaust line; and a controller to control consumption of the refrigerant in the cryogenic refrigerator during a cooling operation bringing the temperature of the cryogenic refrigerator down to operating temperature by varying the speed of the drive motor based on a differential pressure between the high pressure supply line and the low pressure exhaust line of the cryogenic refrigerator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system of controlling as cryopump, the system comprising:
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a cryopanel; a cryogenic refrigerator which is configured to cool the cryopanel, the cryogenic refrigerator including a drive motor configured to drive the cryogenic refrigerator; a controller to control consumption of refrigerant in the cryogenic refrigerator during a cooling operation bringing the temperature of the cryogenic refrigerator down to operating temperature by varying the speed of the drive motor based on a differential pressure between a high pressure supply line and low pressure exhaust line of the cryogenic refrigerator; and a compressor bank, coupled to the cryogenic refrigerator, having at least one compressor configured to supply the refrigerant, the at least one compressor including the high pressure supply line and the low pressure exhaust line. - View Dependent Claims (19)
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20. A system of controlling as cryopump, the system comprising:
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a cryopump including a cryogenic refrigerator and a drive motor configured to drive the cryogenic refrigerator, the cryogenic refrigerator being coupled to at least one compressor configured to supply a refrigerant, the at least one compressor including a high pressure supply line and a low pressure exhaust line; and an electronic controller configured to control a cryopump, the electronic controller controlling consumption of the refrigerant in the cryopump during a cooling operation to bring the temperature of the cryogenic refrigerator down to operating temperature by varying the speed of the drive motor based on a differential pressure between the high pressure supply line and the low pressure exhaust line of the cryogenic refrigerator.
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Specification