The engraving shows the
general arrangement of the apparatus. Figs. 1 to 4 show details of the
compression and expansion valves, which are ordinary flat slides,
partly balanced, and held up to their faces by strong springs from
behind. The steam, compression, and expansion cylinders are severally
bolted to the end of a strong frame, which though attached to the
cooler box does not form part of it, the object being to meet the
strains between the cylinders and shaft in as direct a manner as
possible without allowing them to act on the cooler casting. Each
cylinder is double acting, the pistons being coupled to the shaft by
three connecting rods, the two outer ones working upon crank pins
fixed to overhung disks, and the center one on a crank formed in the
shaft. The slide valves for all the cylinders are driven from two
weigh shafts, the main valve shaft being actuated by a follow crank,
and the expansion and cut off valves from the crosshead pin of the
compressor. The machines may be used either in the vertical position
as exhibited, or may be fixed horizontally; and it is stated that the
construction is such as to admit of speeds of 200 and 300 revolutions
per minute respectively for the larger and smaller machines, under
which conditions the delivery of cold air may be taken at about 7,000
and 2,600 cubic feet per hour.
Pages:
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118