Pipe freezing apparatus

Details Pipe freezing apparatus Pipe freezing apparatus

1997-05-14

1999-11-23

Tapolcai, William E.

Refrigeration

Automatic control

Refrigeration producer

62231, 62293, F25B 4104

Patent

active

059879068

ABSTRACT:
A pipe freezing apparatus 2 has pipe freezer heads 12a, 12b supplied with refrigerant by a compressor 4. The freezer heads 12a, 12b comprise expansion chambers in which the refrigerant expands, to cool the heads. A valve 10 alternately diverts flow of the refrigerant to the freezer heads 12a, 12b. When a supply to a head 12a, 12b is shut off, the compressor lowers the pressure in the head, resulting in enhanced cooling when supply to the head is restored. The compressor 4 can be run continuously while the cooling at the heads is controlled.

REFERENCES:
patent: 2123497 (1938-07-01), Buchanan
patent: 2182318 (1939-12-01), Newill
patent: 4122892 (1978-10-01), Delaporte
patent: 4416118 (1983-11-01), Brister
patent: 4637220 (1987-01-01), Sakano
patent: 5156016 (1992-10-01), Day
patent: 5548965 (1996-08-01), Chen et al.

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