Water chilling unit and air supplementing adjusting method thereof

A technology of water chiller and adjustment method, which is applied in the direction of refrigerators, refrigeration components, compressors, etc., and can solve the problem that the air supply is not adjustable and controlled

CN112178965AActive Publication Date: 2021-01-05ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-01-05

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Abstract

The invention provides a water chilling unit and an air supplementing adjusting method thereof, relates to the technical field of air conditioning equipment, and solves the technical problem that an existing water chilling unit cannot adjust or control air supplementing . The water chilling unit comprises a two-stage compressor, a condenser, a flash evaporator and an evaporator, wherein an air supplementing pipe is arranged between the flash evaporator and the two-stage compressor, an outlet of the air supplementing pipe is communicated between a first-stage impeller and a second-stage impeller of the two-stage compressor, and an adjusting valve is arranged in the air supplementing pipe. A first pressure sensor is arranged in the condenser, a second pressure sensor is arranged in the evaporator, and a third pressure sensor is arranged in the flash evaporator. When the water chilling unit operates normally, the adjusting valve is controlled by comparing the flash pressure with the intermediate pressure, if the flash pressure is smaller than or equal to the intermediate pressure, the adjusting valve is turned down to reduce the air supplementing amount, and if the flash pressure is larger than the intermediate pressure, the adjusting valve is turned up to increase the air supplementing amount, so that the pressure ratio of the first-stage impeller and the pressure ratio of the second-stage impeller are better matched, and the operation energy efficiency of the water chilling unit is improved.
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Description

technical field

[0001] The invention relates to the technical field of air-conditioning equipment, in particular to a water chiller and an air supply adjustment method thereof. Background technique

[0002] At present, most centrifugal chillers use two-stage compressors. In order to further improve the energy efficiency of unit operation, an intermediate economizer (i.e. flasher) is provided. The liquid refrigerant at the bottom of the condenser enters the flasher after a first-stage throttling, and the liquid refrigerant in the flasher enters the evaporator after a second throttling, and the gas refrigerant is directly fed into the second-stage impeller of the compressor for compression . Since the part of the gas fed into the compressor from the flasher is not compressed by the first-stage impeller, the power consumption of this part of the compressor is saved and the energy efficiency of the unit is improved.

[0003] The applicant finds that the prior art has at least...

Examples

Embodiment Construction

[0043] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other implementations obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0044] The invention provides a water chiller, comprising a two-stage compressor 1, a condenser 3, a flasher 4 and an evaporator 2, an air supply pipe is arranged between the flasher 4 and the two-stage compressor 1, and the outlet of the air supply pipe Connected between the first-stage impeller 12 and the second-stage impeller 13 of the two-stage compressor 1, a regulating valve 5 is arranged in the air supply pipe, and the regulating valve 5 is an electric bu...