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2019年6月 4日 (火)

This machine was noisy, inefficient and would prove to be difficult

This machine was noisy, inefficient and would prove to be difficult for air
conditioning manufacturing purposes -- but it was a start. The capacity control
was effectively achieved by a variation of the RPM without unloading the
compressor device.7. This quickly led to a reduction in surging which was
recognized to be useful in many different applications of refrigerants under
high pressure.

This screw compressor design had been patented in 1934 in
Sweden and landed in the USA in the 1950s at a laboratory belonging to the
Worthington Pump Corporation.

By the 1960s, three companies had
successfully pioneered the latest technology and developed machines specifically
designed for refrigeration units - plus some large scale industrial type air
conditioning units. They can also operate both reliably and efficiently while
coupled directly to 2-pole sixty or fifty cycle electrical motors with increased
RPM's, VFD's (variable frequency drives) and step up gears.

conditioning development soon became focused on bridging higher speed
compressors, which aimed to combine the advantages of both types of design - the
centrifugal and the reciprocating models. This is required as compared to any
reciprocating model with a higher CR used typically in low or medium temperature
air conditioning, heat pump and refrigeration applications. We've all come to
rely on this technology so much in our everyday lives; it's difficult to imagine
how we would ever manage without it.

Air conditioning technology has
come a long way since the latter part of the 1950s when there were just two
types of compressors available in the United States for refrigeration and air
conditioning units - a choice of dynamic centrifugal refrigeration machines or
positive displacement machines.

. The major problem was the intense
amount of noise which was produced from the high speed, oil-free, compression
based machine. Fast forward to the 1980s, and although twin
screw barrel
a handful of manufacturers had embraced the screw compressor
function in the 1960s, 1988 saw more than 20 different manufacturing
organizations, including five in the United States, realizing the commercial
viability of the venture. The US manufacturing company D/B - Dunham-Bush seized
the new technology and ran with it having the foresight and the sheer guts to
enter the air conditioning marketplace using hermetic screw-type compressors,
meeting the traditional centrifugal system developers head-on in the fight for
supremacy. There are a number of advantages for utilizing screw compressor
technology in air conditioning and refrigeration units. The potential of the
ranges overlapped, but many experts recognized that there would be plenty of
room for improvement.

The Swedish company which owned the rights to the
1934 design (Svenska Rotor parallel
twin screw barrel
Maskiner AB) began development of an oil flooded device
with a much simpler manufacturing procedure - there were no timing gears, and
this machine could be coupled directly to the two-pole motors simultaneously.
After numerous tests and evaluation procedures for its potential in
refrigeration and air conditioning applications, the design got a resoundingly
negative response. This leads to the flattening of the volumetric efficiency
curves against the compression ratio, which leads to a reduction in the
compressor displacement. The device also needed mechanical speed increases even
if it was directly attached to two electric motors measuring around 3,600 RPMs.

The trend was definitely going the way of portable air conditioning
units which were engine-driven, replacing the traditional reciprocating function
with oil cooled rotary machines, initially utilizing the sliding vane design
before being replaced by the screw design. 1967 saw the official launch of the
DBX line of machines utilizing the screw compressor functions, and a large
display of hermetic screw compressors and chillers were unveiled at the winter
trade show. With these improvements the technology suddenly looked a whole lot
more viable in the world of air conditioning and large scale refrigeration.
Other improvements were also made to the design, including fixed RPM
drives.batten-machinery. Changes were needed, however, to really make an impact
on the air conditioning market for which it was necessary to develop hermetic
screw type compressors.

The technological advancements have really moved
forward at an incredible rate during the last 50 years within the world of air
conditioning and refrigeration.0 up to 1. For a start they are generally smaller
in size, lighter in weight and a much more affordable option than those
utilizing hermetic motors or basic compressors

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