IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0580047
(2000-05-27)
|
발명자
/ 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
9 인용 특허 :
5 |
초록
▼
A positive displacement, recirculating Root's type rotary compressor which operates on a constant volume, near isothermal cycle is disclosed. The compressor includes a pair of involutely lobed impellers and a discharge pressure reflux flow loop. The flow loop includes a discharge port, a flow distri
A positive displacement, recirculating Root's type rotary compressor which operates on a constant volume, near isothermal cycle is disclosed. The compressor includes a pair of involutely lobed impellers and a discharge pressure reflux flow loop. The flow loop includes a discharge port, a flow distributor, an output port, and one or two pair of low impedance rectangular conduits terminating in linear nozzles that serve as reflux ports. Reflux flow through the nozzles is directed with impeller rotation. It isentropically expands into the constant volume displacement cavities so that the contained pressure approaches discharge level. The final pressure increase into discharge is gained through adiabatic compression at a low pressure ratio. The resulting process is inherently non-contaminating, as there are no valves and no contacting or rubbing parts in the flow stream. It can be applied wherever gases or vapors must be compressed.
대표청구항
▼
[ The embodiments of the invention in which patent protection is claimed are defined as follows:] [1.]1. A positive displacement, transverse flow, recirculating rotary gas compressor comprising:a housing having two mutually opposing cylindrically curved interior side walls, said housing including a
[ The embodiments of the invention in which patent protection is claimed are defined as follows:] [1.]1. A positive displacement, transverse flow, recirculating rotary gas compressor comprising:a housing having two mutually opposing cylindrically curved interior side walls, said housing including a gas inlet port at one end located between said mutually opposing cylindrically curved interior side walls and a gas discharge port located at the opposite end of said housing from said inlet port and also located between said mutually opposed cylindrically curved interior side walls; said discharge port opening into a flow distribution manifold having a gas outlet port;first and second involutely lobed impellers journalled to said housing for rotation in opposite directions; each of the impellers having at least five lobes; said impellers being intermeshed so as to form a high impedance seal when said impellers are rotated in opposite directions;said housing including first and second primary reflux conduits connecting said distribution manifold with a pair of first and second primary reflux ports, respectively, said primary reflux ports being formed in said mutually opposing cylindrically curved interior side walls between said inlet port and said discharge port, said primary reflux ports opening into said interior walls of said housing at an acute angle with respect to said interior walls of said housing, whereby gas entering said housing through said primary reflux ports enters in a direction approximating the direction of travel of said impellers;said housing further including first and second auxiliary reflux conduits connecting said distribution manifold with a pair of first and second auxiliary reflux ports, respectively, formed in said mutually opposing cylindrically curved interior side walls, said auxiliary reflux ports opening onto said sidewalls at positions between said primary reflux ports and said discharge port, said auxiliary reflux ports opening into said interior walls of said housing at an acute angle with respect to said interior walls of said housing, whereby gas entering said housing through said auxiliary reflux ports enters in a direction approximating the direction of travel of said impellers;said primary and auxiliary reflux ports being configured as linear nozzles which converge in final approach to said interior walls of said housing, whereby gas is accelerated from a low velocity in said conduits to a higher velocity varying from sonic speed down to impeller lobe tip speed as gas passes through said reflux ports and enters said housing, said reflux ports being shaped, sized, and directed to obtain maximum fluid mass within displacement cavities of said impellers prior to release into discharge;said primary and auxiliary reflux ports being positioned on said side walls at an angular displacement from said discharge port so as to be isolated from direct fluid communication with said discharge port by said impeller lobes. [6.]6. A positive displacement, transverse flow, recirculating rotary gas compressor comprising:a housing having two mutually opposing cylindrical curved interior side walls, said housing including a gas inlet port at one end located between said mutually opposing cylindrically curved interior side walls and a gas discharge port located at the opposite end of said housing from said inlet port and also located between said mutually opposed cylindrically curved side walls; said gas discharge port opening into a flow distribution manifold having a gas outlet port;said housing further including first and second gas reflux ports formed respectively in said mutually opposing cylindrically curved side walls between said inlet port and said discharge port;first and second involutely lobed impellers journalled for rotation in opposite directions within said housing; each of the impellers having six lobes; said impellers being intermeshed so as to form a high impedance seal when said impellers are rotated in opposite directions;first and second primary reflux conduits connecting said manifold with first and second reflux ports, said reflux ports opening into said interior walls of said housing at an acute angle with respect to said interior walls of said housing, whereby gas entering said housing through said reflux ports enters in a direction approximating the direction of travel of said impellers;said first and second primary reflux ports configured as linear nozzles formed by converging said first and second reflux conduits in final approach to said interior walls of said housing, whereby recirculation gas is accelerated from a low velocity in said first and second reflux conduits to a higher velocity varying from sonic down to impeller lobe tip speed as the reflux gas passes through the nozzle throat of said first and second reflux ports and enters said housing, said first and second reflux ports being shaped, sized, and directed to obtain maximum contained fluid mass within displacement cavities of said impellers prior to release into discharge, and wherein said mutually opposed cylindrically curved interior surfaces of said housing extend through angular sectors of at least 60 degrees between the proximal edges of said discharge port and each of the said reflux ports, and extend through angular sectors of approximately 120 degrees between the proximal edges of said inlet port and each of said reflux ports; and wherein the entry angle of each of said reflux ports is approximately 50 to 55 degrees from the direction normal to said interior surfaces of said housing, and in the direction of travel of said impellers; andsaid inlet port and said discharge port being approximately equal in size to one another; said discharge port being approximately twice the size of each of said recirculation conduits; said inlet, said discharge and said recirculation ports being isolated from direct fluid communication with one another.
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