CN-122014643-A - Centrifugal compressor and centrifugal chiller

Abstract

The invention relates to a compressor and an air conditioner, and belongs to the technical field of air conditioner compressors, wherein the compressor comprises a shell, a main shaft, a motor, a first impeller, a second impeller, a reflux device and a sealing structure; the sealing structure comprises a ring body and turbine blades, the ring body is rotationally connected to the shell, the turbine blades are arranged on one side of the ring body, the turbine blades are positioned on the inner side of the ring body, a flow path is formed in the shell, and the turbine blades of the sealing structure are positioned in the flow path. The sealing structure is used for arranging the turbine blades in a flow path on the inner side of the reflux device, taking the pre-rotation of the air flow at the outlet of the reflux device as the power to passively rotate, optimizing the flow field at the inlet of the second impeller by consuming the pre-rotation, and improving the working efficiency of the second impeller.

Inventors

• ZHANG WENQIANG
• ZHAO PENGFEI
• MENG QINGCHAO
• CONG HUI

Assignees

• 青岛海信日立空调系统有限公司

Dates

Publication Date

20260512

Application Date

20260210

Claims (9)

1. 1. Centrifugal machine the air flow of the compressor is controlled by the air flow, characterized in that it comprises: The main shaft is rotationally connected in the shell; The motor drives the main shaft to rotate; a first impeller connected to the main shaft; the second impeller is connected to the main shaft and is arranged at intervals with the first impeller; the first reflux device is connected to the main shaft; The first reflux device comprises a first blade, wherein the first blade is arranged on one side of the first reflux device; A second return, the second return being located inside the first return; Wherein the second reflow apparatus includes: The ring body is rotationally connected with the shell; The second blade is arranged on one side of the ring body, and the second blade is positioned on one side facing the first reflux device; the first and second return are located between the first and second impellers; a diffuser passage located between the first impeller and the first backflow device; the first reflux device, the second reflux device and the second impeller form the airflow channel, and the first blade and the second blade are positioned in the airflow channel.
2. 2. The centrifugal compressor according to claim 1, wherein gas/liquid in said gas flow path passes said second vane to rotate said second return.
3. 3. The centrifugal compressor according to claim 1, wherein an inner peripheral wall of the ring body is provided with threads, a spiral direction of the threads is the same as a rotation direction of the second backflow unit, and the threads are adjacent to an end peripheral wall of the second impeller.
4. 4. The centrifugal compressor of claim 2, wherein the second impeller includes a plurality of circumferentially spaced second blades, the threads being adjacent an outer edge of each of the second blades.
5. 5. The centrifugal compressor according to claim 1, wherein a plurality of second blades are provided at intervals along the circumferential direction of the ring body, and the pitch of any adjacent two turbine blades is the same.
6. 6. The centrifugal compressor according to claim 4, wherein said flow reverser comprises a plurality of first vanes and said third vanes are circumferentially spaced apart, and wherein in said flow path, liquid/gas in the flow path passes first said first vanes and then said second vanes.
7. 7. The centrifugal compressor of claim 1, wherein a plurality of the first blades and a plurality of the second blades are staggered in a circumferential direction.
8. 8. The centrifugal compressor of claim 1, wherein the outer peripheral wall of the ring body is in sealing and rotatable connection with the inner wall of the housing by a bearing.
9. 9. A centrifugal water chilling unit is characterized in that, the centrifugal chiller includes the centrifugal compressor of any one of claims 1-8.

Description

Centrifugal compressor and centrifugal chiller Technical Field The application relates to the technical field of air conditioner compressors, in particular to a centrifugal compressor and a centrifugal water chilling unit. Background In air conditioning, a compressor is required to compress refrigerant, and in multistage tandem centrifugal compressors, uniformity of the secondary impeller inlet flow field directly affects overall energy efficiency. In order to improve the working efficiency of the secondary impeller, a reflux part is usually arranged in front of the secondary impeller to rectify and guide inlet airflow, and an air seal tooth structure is arranged at the gap between the rotating part and the static part to reduce leakage and reduce pneumatic loss. In the prior art, a serial reflux device structure is adopted, the gas separation phenomenon is reduced through serial turbine blade arrangement, the racemization effect of the turbine blades is improved, meanwhile, the flow loss is reduced, and the reflux device efficiency is improved. In addition, the scheme of adopting the active jet type reflux device structure is adopted, small holes are formed in the suction surface of the turbine blade of the reflux device and jet air, a low-speed low-energy region formed by the suction surface is blown off, the air flow mixing loss is reduced, the air inlet distortion of the secondary impeller is prevented, and therefore the operation efficiency of the compressor is improved. However, in the above prior art, the flow rectification design of the reflux device and the seal structure of the air seal teeth are independent of each other, and effective coupling between the two is not realized, so that the pre-rotation air flow at the outlet of the reflux device cannot be fully utilized, the uniformity of the inlet flow field of the secondary impeller and the gap leakage inhibition effect are optimized, the overall aerodynamic loss is difficult to be further reduced, and the energy efficiency is limited. Disclosure of Invention The present invention solves at least one of the technical problems in the related art to a certain extent. Therefore, the application aims to provide the compressor and the air conditioner, the sealing structure is characterized in that the second blade is arranged in the air flow channel at the inner side of the first reflux device, the air flow at the outlet of the first reflux device is used as power to rotate passively, the flow field at the inlet of the second impeller is optimized through consumption of pre-rotation, the acting efficiency of the second impeller is improved, the leakage of a static rotating gap is restrained by means of dynamic sealing effect, no additional energy input is needed, the flow channel rectification and gap sealing coupling are realized, the pneumatic loss of the multistage centrifugal compressor is effectively reduced, and the energy efficiency and the operation stability are improved. To achieve the above object, the present invention provides a centrifugal compressor comprising: The main shaft is rotationally connected in the shell; The motor drives the main shaft to rotate; a first impeller connected to the main shaft; the second impeller is connected to the main shaft and is arranged at intervals with the first impeller; the first reflux device is connected to the main shaft; The first reflux device comprises a first blade, wherein the first blade is arranged on one side of the first reflux device; A second return, the second return being located inside the first return; Wherein the second reflow apparatus includes: The ring body is rotationally connected with the shell; The second blade is arranged on one side of the ring body, and the second blade is positioned on one side facing the first reflux device; the first and second return are located between the first and second impellers; a diffuser passage located between the first impeller and the first backflow device; the first reflux device, the second reflux device and the second impeller form the airflow channel, and the first blade and the second blade are positioned in the airflow channel. In some embodiments, the gas/liquid in the gas flow channel passes through the second blade to rotate the second reflux device. In some embodiments, the inner peripheral wall of the ring body is provided with threads, the spiral direction of the threads is the same as the rotation direction of the second reflux device, and the threads are close to the end peripheral wall of the second impeller. In some embodiments, the second impeller comprises a plurality of circumferentially spaced second blades, and the thread is adjacent to an outer edge of each of the second blades. In some embodiments, a plurality of second blades are arranged at intervals along the circumferential direction of the ring body, and the interval between any two adjacent turbine blades is the same. In some embodiments, the flow reverser compr