Search

CN-224215585-U - Water chilling unit

CN224215585UCN 224215585 UCN224215585 UCN 224215585UCN-224215585-U

Abstract

The utility model discloses a water chilling unit which comprises a compressor, a condenser and an evaporator, wherein the compressor, the condenser and the evaporator are connected through pipelines to form a refrigeration cycle system, the water chilling unit further comprises a flow control valve, a throttling piece and an adjustable flow electric valve, the flow of the flow control valve is in nonlinear change along with the opening, the flow control valve is arranged on a pipeline between the condenser and the evaporator to form a main liquid path, the throttling piece is arranged on the main liquid path between the condenser and the evaporator and forms a throttling device together with the flow adjustment, the caliber of the adjustable flow electric valve is smaller than that of the flow control valve, and a bypass adjustment branch is formed between the condenser and the evaporator and is used for compensating the flow adjustment of the flow control valve by adjusting the opening of the adjustable flow electric valve. According to the utility model, the bypass regulating branch is arranged for the flow control valve with the flow non-linearly changing along with the opening, so that the accuracy and consistency of flow regulation and the stability of a system are improved.

Inventors

  • MA ZHEN
  • LI GENYUAN
  • ZHU HAITAO
  • LI LIN

Assignees

  • 青岛海信日立空调系统有限公司

Dates

Publication Date
20260508
Application Date
20250429

Claims (10)

  1. 1. The water chilling unit comprises a compressor, a condenser and an evaporator, and is connected through pipelines to form a refrigeration cycle system, and is characterized by further comprising: The flow control valve is arranged on a pipeline between the condenser and the evaporator to form a main liquid path, and the flow of the flow control valve varies along with the nonlinear opening degree; A throttle member provided in the main liquid passage and forming a throttle device together with the flow control valve; The caliber of the adjustable flow electric valve is smaller than that of the flow control valve, and a bypass adjusting branch is formed between the condenser and the evaporator and is used for compensating flow adjustment of the flow control valve by adjusting the opening of the adjustable flow electric valve.
  2. 2. The chiller according to claim 1 further comprising an economizer located on said main circuit and comprising a make-up port connected to said compressor for making up air for said compressor; The flow control valve comprises a first flow control valve and a second flow control valve, wherein the throttling piece comprises a first throttling piece and a second throttling piece, the first flow control valve and the first throttling piece are connected in series between the condenser and the economizer, and the second flow control valve and the second throttling piece are connected in series between the economizer and the evaporator; one end of the first throttling element and one end of the second flow control valve are respectively connected with a liquid inlet and a liquid outlet of the economizer, and the flow-adjustable electric valve is connected with the first flow control valve in parallel.
  3. 3. The chiller according to claim 1 further comprising an economizer located on said main fluid path and comprising a make-up port, said make-up port being connected to said compressor for making up air for said compressor; The flow control valve comprises a first flow control valve and a second flow control valve, wherein the throttling piece comprises a first throttling piece and a second throttling piece, the first flow control valve and the first throttling piece are connected in series between the condenser and the economizer, and the second flow control valve and the second throttling piece are connected in series between the economizer and the evaporator; One end of the first throttling element and one end of the second flow control valve are respectively connected with a liquid inlet and a liquid outlet of the economizer, and the liquid outlet is respectively connected with the public end of the second flow control valve and the two ends of the adjustable flow electric valve through pipelines.
  4. 4. The chiller according to claim 1 further comprising an economizer located on said main fluid path and comprising a make-up port, said make-up port being connected to said compressor for making up air for said compressor; The flow control valve, the first throttling element, the economizer and the second throttling element are sequentially connected in series between the condenser and the evaporator; The common end of the condenser and the flow control valve, and the common end of the second throttling element and the evaporator are respectively connected with two ends of the flow-adjustable electric valve through pipelines.
  5. 5. The chiller according to claim 1 further comprising an economizer located on said main fluid path and comprising a make-up port, said make-up port being connected to said compressor for making up air for said compressor; The flow control valve comprises a first flow control valve and a second flow control valve, wherein the throttling piece is a throttling orifice plate and comprises a first throttling piece and a second throttling piece, the first flow control valve and the first throttling piece are connected in series between the condenser and the economizer to form a first throttling device, and the second flow control valve and the second throttling piece are connected in series between the economizer and the evaporator to form a second throttling device; One end of the first throttling element and one end of the second flow control valve are respectively connected with a liquid inlet and a liquid outlet of the economizer, and the flow-adjustable electric valve is connected with the first throttling device in parallel.
  6. 6. The chiller according to claim 1 further comprising an economizer located on said main fluid path and comprising a make-up port, said make-up port being connected to said compressor for making up air for said compressor; The flow control valve comprises a first flow control valve and a second flow control valve, wherein the throttling piece is a throttling orifice plate and comprises a first throttling piece and a second throttling piece, the first flow control valve and the first throttling piece are connected in series between the condenser and the economizer, and the second flow control valve and the second throttling piece are connected in series between the economizer and the evaporator; One end of the first throttling element and one end of the second flow control valve are respectively connected with a liquid inlet and a liquid outlet of the economizer, and the liquid outlet is respectively connected with the public end of the second flow control valve and the public end of the second throttling element and the evaporator through pipelines and the two ends of the adjustable flow electric valve.
  7. 7. The chiller according to claim 1 further comprising an economizer located on said main fluid path and comprising a make-up port, said make-up port being connected to said compressor for making up air for said compressor; the throttling piece is a throttling orifice plate and comprises a first throttling piece and a second throttling piece; the flow control valve, the first throttling element, the economizer and the second throttling element are sequentially connected in series between the condenser and the evaporator; the common end of the condenser and the flow control valve, and the common end of the economizer and the second throttling element are respectively connected with the two ends of the adjustable flow electric valve through pipelines.
  8. 8. The water chiller of any one of claims 2 to 4, wherein the first and/or second restrictions employ an orifice plate.
  9. 9. The water chiller according to any one of claims 1 to 7 wherein the flow control valve is a V-port electric ball valve.
  10. 10. The water chiller according to any one of claims 1 to 7 wherein the adjustable flow motorised valve is an electronic expansion valve.

Description

Water chilling unit Technical Field The utility model relates to the technical field of air conditioning, in particular to a water chilling unit. Background At present, large-scale water chilling units in industry generally use a scheme of matching an electric adjusting ball valve with a fixed pore plate, and particularly when the adjusting ball valve is a ball valve with a V-shaped opening, the adjusting ball valve is fine and accurate in adjustment when the opening degree is small, and the flow change corresponding to valve adjustment is increased sharply when the opening degree is large. In the industry, the liquid level is regulated by matching PID control with an electric ball valve, and the regulating speed and amplitude of the PID control parameters cannot be regulated and changed in real time when the ball valve is at a small opening degree and a large opening degree, so that the accuracy and the regulating efficiency of the valve can not be considered in the PID control when the ball valve is at the large opening degree and the small opening degree. The valve is set to be small in adjustment amplitude, so that the liquid level fluctuation is as small as possible, but the adjustment speed of the valve in small opening degree is affected, and the problem of inconsistent adjustment speed cannot be fundamentally solved. The above information disclosed in this background section is only for enhancement of understanding of the background section of the application and therefore it may not form the prior art that is already known to those of ordinary skill in the art. Disclosure of Invention Aiming at the problem that the adjustment accuracy and consistency are poor when the large-sized water chilling unit provided in the background technology uses the electric adjustment type ball valve to adjust the flow of the refrigerant in cooperation with the fixed pore plate, the utility model provides the water chilling unit, wherein the bypass adjustment branch is arranged for the electric adjustment type ball valve, the accuracy and consistency of flow adjustment are improved, and the stability of the system is further improved. In order to achieve the aim of the utility model, the utility model is realized by adopting the following technical scheme: The water chilling unit comprises a compressor, a condenser, an evaporator, a flow control valve, a throttling element and an adjustable flow electric valve, wherein the compressor, the condenser and the evaporator are connected through pipelines to form a refrigeration cycle system; The flow of the flow control valve is nonlinear changed along with the opening, and the flow control valve is arranged on a pipeline between the condenser and the evaporator to form a main liquid path; the throttling element is arranged on the main liquid path and forms a throttling device together with the flow control valve; The caliber of the adjustable flow electric valve is smaller than that of the flow control valve, and a bypass adjusting branch is formed between the condenser and the evaporator and is used for compensating flow adjustment of the flow control valve by adjusting the opening of the adjustable flow electric valve. The water chilling unit is linked with the flow control valve of the main liquid path by arranging the bypass adjusting branch capable of adjusting the flow for the main liquid path, the adjusting precision of the bypass adjusting branch is higher than that of the flow control valve, the flow control valve is used for coarse adjustment in the flow adjusting process, the electric valve is used for assisting fine adjustment in the flow adjusting process, the under-adjustment or over-adjustment caused by nonlinear change of the flow along with the opening degree in the flow controlling process of the flow control valve is compensated, the inaccuracy of flow control is overcome, the accuracy and consistency of flow adjustment are improved, the stabilizing speed of the liquid level of the heat exchanger is accelerated, and the stability and the reliability of the system are improved. In some specific embodiments, the system further comprises an economizer positioned on the main liquid path and comprising a gas supplementing port, wherein the gas supplementing port is connected with the compressor and used for supplementing gas for the compressor; The flow control valve comprises a first flow control valve and a second flow control valve, wherein the throttling piece comprises a first throttling piece and a second throttling piece, the first flow control valve and the first throttling piece are connected in series between the condenser and the economizer, and the second flow control valve and the second throttling piece are connected in series between the economizer and the evaporator; One end of the first throttling element and one end of the second flow control valve are respectively connected with a liquid inlet and a liquid outlet of the economizer, and the