CA compressor | MonitorTop Refrigerator Forum

ChrisJ
Administrator

Posts: 2,502

CA compressor Sept 20, 2013 0:16:24 GMT

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Post by ChrisJ on Sept 20, 2013 0:16:24 GMT

After reading the service manual I realized the CA compressor was not a "rotary vane" type pump but rather an oscillating rotary pump. What had me confused was there is no mention of an oil pump and yet they do say bearings are fed by oil under pressure.

Patent # 1915097 may not be the exact pump but I have a feeling it has an awful lot in common with the CA one. The key in the slot is the oil pump so its actually two pumps in one!

I also feel Patent # 2080236 shows a compressor like or close to the one used in the CA. The CA also mentions the use of an exhaust muffler.

Attachments:

1915097_ROTARY_PUMP.pdf (407.11 KB)

2080236_MUFFLING_DEVICE_FOR_COMPRESSORS ro....pdf (273 KB)

CA-2-A16 S/N 3326603 Porcelain cabinet with right hand door and capillary tube conversion. Restored and in use.
CA-2-B16 S/N 4126576 Painted cabinet with left hand door. Has bad float valve and needs paint.
CA-2-B16 S/N 41-944-942 Porcelain cabinet with right hand door. Has cracked liquid line, bad float valve and needs paint.
CK-2-B16 S/N 5320471 top only currently being restored

cablehack
Administrator

Posts: 2,024

CA compressor Sept 20, 2013 1:01:33 GMT

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Post by cablehack on Sept 20, 2013 1:01:33 GMT

I noticed that too - despite information previous to the proper service manual telling us it was a rotary vane type.
The CA manual doesn't actually describe the full workings of the compressor, and seeing no visible pump in the diagram, I had assumed that the screw thread on the motor shaft was what circulated the oil, like an Archimedes screw.
It does in fact seem the rotary pump patent 19150957 is the closest. Although I'd seen that patent before I never took much notice of it because the DR style casing and fins made me assume it was just a variant of that model - even looks like it might have a porcelain evaporator.
If you look at the patent and real thing side by side, it looks like there has been some simplification in the production model. Note also the unloader is at the top of the motor for the production model.

Last Edit: Sept 20, 2013 1:04:44 GMT by cablehack

CA-2-B15 s/n 4328374
CA-1-B15 s/n 4326047

ChrisJ
Administrator

Posts: 2,502

CA compressor Sept 23, 2013 2:38:09 GMT

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Post by ChrisJ on Sept 23, 2013 2:38:09 GMT

I noticed when paying close attention to mine running this weekend that I think I can hear the unloader when it shuts down. Reminds me of the sound an engine makes if you shut it off with the throttle wide open.

There is a definite sound change when it shuts off.

CA-2-A16 S/N 3326603 Porcelain cabinet with right hand door and capillary tube conversion. Restored and in use.
CA-2-B16 S/N 4126576 Painted cabinet with left hand door. Has bad float valve and needs paint.
CA-2-B16 S/N 41-944-942 Porcelain cabinet with right hand door. Has cracked liquid line, bad float valve and needs paint.
CK-2-B16 S/N 5320471 top only currently being restored