Novel interstage air supplementing device of multi-stage compression centrifugal type refrigeration compressor

Abstract

The invention discloses a novel interstage air supplementing device of a multi-stage compression centrifugal type refrigeration compressor. The air supplementing device is characterized in that a second-stage exhaust volute (19) is arranged in a casing (1); a first-stage suction guiding ring (11), a first-stage impeller (5), a second-stage impeller (10) and an impeller distance ring (8) are arranged on a transmission shaft (9); a second-stage suction passage (15) is arranged in an interstage baffle (3); a first-stage exhaust passage (14) is formed between a first-stage diffuser (2) and the interstage baffle (3) in the casing (1); a second-stage exhaust passage (17) is formed between the interstage baffle (3) and the second-stage impeller (10); the casing (1), the first-stage diffuser (2) and the interstage baffle (3) commonly form an air supplementing and supplying passage (20); a straight slot section (18) is formed between the first-stage diffuser (2) and the interstage baffle (3); and an inter-stage sealing ring (7), a first-stage wheel cover sealing (4) and a second-stage wheel cover sealing (6) are arranged. By the device, the interstage air can uniformly enter a reflux apparatus of the compressor; the efficiency of the compressor is improved; and the airflow noise of the compressor is reduced.

Description

Technical field: [0001] The invention relates to a novel interstage gas supply device for a multi-stage compression centrifugal refrigeration compressor used in a large centrifugal heat pump unit, which belongs to a novel energy-saving and environment-friendly device in the field of centrifugal compressors. Background technique: [0002] The centrifugal heat pump unit is mainly composed of a double impeller compressor, a condenser, an economizer, an evaporator and a throttling device. It belongs to a two-stage compression and intermediate cooling system. The refrigerant gas discharged from the first-stage compression passes through the bend and the reflux device. , together with the flashed refrigerant gas flowing through the economizer of the gas supply device, enters the second-stage impeller and continues to compress. [0003] The interstage air supply port of the two-stage compression centrifugal compressor generally adopts a circular air supply port for partial tangenti...

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Problems solved by technology

[0003] The interstage air supply port of the two-stage compression centrifugal compressor generally adopts a circular air supply port for partial tangential supply of air, and some circular air supply ports for local tangential supply of air, which are mixed with the exhaust gas of the first stage at the bend; or other The type air supply port is mixed with the first-stage exhaust gas by the bend or the reflux device, and then enters the second-stage impeller. Not only there are problems such as uneven gas mixing, large air flow pulsation, and loud noise, but also affects the efficiency of the compressor.

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