US1893171A - Rotary compressor - Google Patents

Description

Jan. 3, 1933 E. me]

ROTARY COMPRESSOR Filed Nov. 14. 1931 Fateuted Jan 3,, 1933 Em meet, or wmrnrt'rnn'rt, SWITZERLAND, ASSIGNOR T0 FIR-M S'ULZER FB'ERES soorE'trE ANONYME, or WINTERTHUR, SWITZERLAND ao'reiw corar-ansson Application filed; November 14-, 1931, Serial "No. 574,977, and. in Switzerland November 17, 1930.

This invention relates to rotary compressors and has as its object to provide an ar rangementfor reducing the temperature of the compressed fluid delivered and simultaneously increasing the capacity of the machine.

According to the invention the suction, compression and delivery chambers of the compressorare connected to an injector device in such a manner thatworking fluid from the delivery chamber combines in the injector device with working fluid from the suction chamber and the resultant working fluid at an intermediate pressure is cooled and is in troduced into the compression chamber so as to reduce to a desired value the temperature of the compressed working fluid delivered by the compressor.

If desired, the working fluid withdrawn from the delivery chamber of the compressor may be passed through a cooler prior to being supplied to the injector device so as to increase still further the cooling action of the intermediate pressure fluid introduced into the compression chamber.

One construction according to the invention will now be described, by way of example, with reference to the accompanying drawing, the single figure of which shows a sectional side elevation of the compressor.

As shown in the figure a multi-bladed rotary compressor has a rotor a carrying outwardly sliding vane-type blades 7) arranged in a casing 0. When the compressor is operating the working fluid passes in the direction indicated by the arrows from the suction chamber d through the crescent-shaped compression chamber 6 to the delivery chamber An injector device 72 is provided with a pressure fluid inlet h which is connected through a cooling coil g, a pipe 9 and a regulating valve 0 to the delivery chamber f of the compressor. A suction inlet is in the injector device at is connected by the pipe 2' and regulating valve 12 to the suction chamber (1 of the compressor whilst the delivery discharge outlet m of the injector device n is connected through a cooling coil and pipe Z-to a point in the compression chamber 6 at an intermediate pressure.

When the compressor is operating, high pressure fluid from the chamber f is blown through the pressure fluid inlet h and draws low pressure fluid from the suction chamber (Z which low pressure fluid, mixing with the high pressure fluid in the suction inlet is, produces a resultantworking fluid at an intermediate pressure which passes through the cooling coil Z and into the compression chamher 6. This cooled working fluid introduced into the compression chamber tends to cool the fluid which is already in that chamber and which is heated by the partial compression to which it has already been subjected. It will be apparent that a reduction will thus be effected in the final temperature of the compressed fluid delivered into the chamber f.

The quantity of the working fluid introduced through the injector 71 into the compression chamber can be regulated by means of the valves p and 0 in such a manner that the final temperature of the compressed fluid can be reduced to a desired value, additional regulation of this temperature being obtained, if necessary, by adjusting the temperai ture of the cooling medium circulating round the coils Z and g. If desired the cooling coil 9 may be omitted but it this is done a somewhat smaller temperature reduction is ob tained.

it will be appreciated that the quantity of fluid delivered by the compressor is increased by reason of the additional fluid drawn from the suction chamber by the injector and admitted into the compression chamber through the pipe Z.

It is to be understood that the above description is by way of example'only and that modifications may be made within the scope of the invention.

it claim:

1. In a rotary compressor, in combination a rotor carrying outwardly sliding vane-type blades, a casing for said rotor provided with a crescent-shaped compression chamber, a suction chamber and a delivery chamber, an injector device having a pressure-fluid inlet, a suction inlet and a delivery discharge outlet, a pipe connecting said delivery chamber to said pressure fluid inlet, a second pipe con- 100 necting said suction inlet to said suction chamber, a third pipe connecting said delivery discharge outlet to an intermediate point of said crescent-shaped compression chamber and a cooling coil inserted in said third pipe connection.

2. In a rotary compressor, in combination a rotor carrying outwardly sliding vane-type blades, a casing for said rotor provided with a crescent-shaped compression chamber, a suction chamber and a delivery chamber, an injector device having a pressure-fluid-inlet, a suction inlet and a delivery discharge outlet, a pipe connecting said delivery chamber to said pressure fluid inlet, a cooling coil arranged in said pipe, a second pipe connecting said suct on inlet to said suction chamber, a third pipe connecting said delivery discharge outlet to an intermediate point of said cresf cent-shaped compression chamber and a cool-t ing coil inserted in said third pipe connection.

3. In a rotary compressor, in combination a rotor carrying outwardly sliding vane-type blades, a casing for said rotor provided with a crescent-shaped compression chamber, asuct on chamber and a delivery chamber, an injector device having a pressure-fluid inlet, a suction inlet and a delivery discharge outlet, a pipe connecting said delivery chamber to said pressure fluid inlet, a regulating valve in said pipe, a cooling coil arranged in said pipe, a second pipe connecting said suction inlet to said suction chamber, a regulating valve in said second pipe, a third pipe connecting said delivery discharge outlet to an intermediate point of said crescent-shaped compression chamber and a cooling coil insorted in said third pipe connection.

In testimony whereof I aflix my signature.

EMIL KAGI.

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