Browse Prior Art Database

Vacuum Manifold

IP.com Disclosure Number: IPCOM000045107D
Original Publication Date: 1983-Feb-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 3 page(s) / 44K

Publishing Venue

IBM

Related People

Puffenbarger, S: AUTHOR

Abstract

Fig. 1 is a view of the vacuum manifold invention, and Fig. 2 is an overall view of how it is connected into a refrigeration system to be pumped down.

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Vacuum Manifold

Fig. 1 is a view of the vacuum manifold invention, and Fig. 2 is an overall view of how it is connected into a refrigeration system to be pumped down.

As shown in Fig. 2, a conventional refrigeration system employs a coolant compressor 1 which compresses the coolant and forces it into the condenser 2 where it liquifies. The liquified coolant is then transferred to the metering device 3 which sprays the coolant into the evaporator chamber 4, thereby providing the desired chilling. The evaporated coolant is then passed over the conduit 5 back to the compressor for recompression and recycling. The coolant must be replenished from time to time, and the conventional approach for replacing the coolant is to evacuate the high pressure side at the nipple 6 and the low pressure side at the nipple 7 to a predetermined low pressure, and then to introduce additional coolant through either one or both of the nipples 6 and 7 to a second, higher pressure. The problems which have arisen with conventional gauging manifolds which are used to introduce both the vacuum and the coolant revolve around air leakage which occurs in the existing evacuation manifolds, which limits the low vacuum which can be achieved in the pump down process. In addition, the relatively small inner diameter of the channels in conventional evacuating manifolds, limits the pump down capacity and therefore lengthens the time required to carry out the necessary vacuum pump down of the system.

These problems are solved by the vacuum manifold shown in Fig. 1 and connected as is shown in Fig. 2. The vacuum manifold 8 is a two-inch-diameter copper cylinder of approximately 12 inches in length. Attached to the copper cylinder are four pipes, a vacuum pump down pipe 9, a first pull-down pipe 13, a second pull down pipe 17, and a gauging pipe 20.

The vacuum pump pipe 9 includes a diaphragm valve (Craten) which offers a tight seal against air leakage. A purge port 11 is located between the valve 10 and the connection point for the pipe 9.

As shown in Fig. 2, a vacuum pump 12 is connected to the pipe 9 when the system is to be initially pumped down. Later, after the system has been pumped down, the valve 10 will be closed and the vacuum pump 12 removed and then a coolant source such as a FREON (Trademark of E.I. du Pont de Nemours & Co.) source 12' will be connected to the pipe 9. At that time, the purge port 11 will be opened and the positive pressure of the coolant source 12' will be used to push out any residual air in the pipe 9 between the FREON source 12' and the valve 10. The purge port 11 will then be closed and the diaphragm valve 10 can be opened to introduce the FR...