CN-121993912-A - Cold water machine suitable for high load and control method thereof

CN121993912ACN 121993912 ACN121993912 ACN 121993912ACN-121993912-A

Abstract

The invention discloses a cold water machine adapting to high load and a control method thereof, which solve the problem that when a cold water machine system is used under high load, downtime is easy to occur, so that the cold water machine cannot be used normally; the precooling loop comprises a precooler, a flow regulating valve is arranged on the precooler, the precooler is arranged between the condensing heat exchanger and the fan, and the precooler firstly cools and cools high-temperature air, so that the temperature of the air for cooling and exchanging heat of the compressor is reduced to a target temperature and then exchanges heat with the compressor. Can run under the high load and lead to exhaust temperature high, under the condition that compressor body temperature is high, reduce compressor body temperature, reduce chiller equipment downtime risk, promote chiller equipment stability.

Inventors

XU XUECHONG
WANG QIAOGANG
ZHOU QINGZHONG

Assignees

浙江先导热电科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20251231

Claims (10)

1. The cold water machine suitable for high load is characterized by comprising a low-temperature circulating liquid loop and a refrigerant circulating loop, wherein the low-temperature circulating liquid loop comprises a fluid loop and a precooling loop, the refrigerant circulating loop comprises a compressor, the compressor is connected with a condensing heat exchanger, a fan is arranged between the compressor and the condensing heat exchanger, the precooling loop comprises a precooler, a flow regulating valve is arranged on the precooler, the precooler is arranged between the condensing heat exchanger and the fan, and the precooler firstly cools and cools high-temperature air to enable the temperature of the air for cooling and heat exchanging of the compressor to be reduced to a target temperature and then exchanges heat with the compressor.
2. The high-load-adaptive water chiller according to claim 1 is characterized in that a circulating liquid water return port is arranged on the water chiller, the circulating liquid water return port is connected with a liquid inlet of a precooler, the flow regulating valve is arranged on a pipeline between the circulating liquid water return port and the liquid inlet of the precooler, and a liquid outlet of the precooler is connected with a circulating liquid water outlet of the water chiller.
3. The chiller according to claim 2 wherein said fluid circuit comprises an evaporative heat exchanger, said circulating fluid return port is connected to a circulating fluid inlet of the evaporative heat exchanger, a circulating fluid outlet of the evaporative heat exchanger is connected to a water tank, and a water outlet of the water tank is connected to a water outlet of the chiller.
4. A chiller according to claim 1,2 or 3 wherein the refrigerant circulation loop comprises an evaporative heat exchanger, the refrigerant outlet of the evaporative heat exchanger being connected to a compressor inlet, the compressor inlet being connected to a condensing heat exchanger inlet, the condensing heat exchanger outlet being connected to the evaporative heat exchanger inlet.
5. The water chiller adapting to high load according to claim 3 wherein the circulating fluid inlet of the evaporative heat exchanger is provided with a circulating fluid return water temperature sensor.
6. The high-load-adaptive water chiller according to claim 2, 3 or 5 wherein the water outlet of the precooler and the circulating fluid outlet of the water chiller are provided with a circulating fluid outlet pressure sensor and a circulating fluid outlet temperature sensor.
7. The chiller according to claim 4 wherein a refrigerant return air temperature sensor and a low pressure refrigerant pressure sensor are disposed between the refrigerant outlet of the evaporative heat exchanger and the compressor inlet.
8. The high-load compatible water chiller according to claim 4 wherein an exhaust gas temperature sensor and a high-pressure refrigerant pressure sensor are provided between the outlet of the condensing heat exchanger and the refrigerant inlet of the evaporating heat exchanger.
9. A control method of a chiller adapted to high load, applied to the chiller adapted to high load according to any one of claims 1 to 8, comprising: Collecting the exhaust temperature of a fan and the temperature of a compressor body; If the exhaust temperature of the fan or the temperature of the compressor body is greater than a set value, a flow regulating valve is opened, and a low-temperature circulating liquid part flows through a precooler to cool and precool high-temperature air absorbed by the fan; And after the high-temperature air is reduced to a target temperature value, exchanging heat between the high-temperature air and the compressor.
10. The control method of a chiller according to claim 9 wherein the higher the fan discharge temperature or the compressor body temperature, the greater the flow control valve opening.

Description

Cold water machine suitable for high load and control method thereof Technical Field The invention relates to the technical field of compressor type water coolers, in particular to a water cooler suitable for high load and a control method thereof. Background Along with the continuous development and growth of the water chiller market, the water chiller products are also updated in continuous iteration, the products on the current market are various in variety, and the product functions can meet most of demands of customers. When the compressor type water chiller product in the current market is used under high load, the problems that the exhaust temperature of a refrigerating system is high, the temperature of a compressor body is high and the like exist, and the product cannot be normally used due to downtime protection. As in the prior patent CN118794206a, a water chiller system based on surge and static protection and a control method thereof are adopted, and the adopted water chiller system is a compressor type water chiller system. The water chiller system provided by the patent can accurately adjust the water outlet temperature of the water chiller system, improve the energy utilization efficiency of the water chiller system, ensure the normal operation of the communication of the water chiller system when the electric phenomenon interference occurs, and ensure the stability and the reliability of the water chiller system. However, when the exhaust temperature or the temperature of the compressor body reaches the upper control limit, the protection of the water chiller is still down. Disclosure of Invention The invention aims to solve the problem that when a water chiller system is used under high load, downtime is easy to occur, so that the water chiller cannot be used normally in the prior art, and provides the water chiller and the control method thereof which are suitable for the high load. In order to achieve the above purpose, the present invention adopts the following technical scheme: The low-temperature circulating liquid loop comprises a fluid loop and a precooling loop, circulating liquid flows into the fluid loop and the precooling loop respectively after flowing in from a circulating liquid water return port of the cold water machine, the refrigerating liquid circulating loop comprises a compressor, the compressor is connected with a condensing heat exchanger, a fan is arranged between the compressor and the condensing heat exchanger, the precooling loop comprises a precooler, a flow regulating valve is arranged on the precooler, the precooler is arranged between the condensing heat exchanger and the fan, and the precooler firstly cools and cools high-temperature air, so that the air temperature for cooling and heat exchanging of the compressor is reduced to a target temperature and then exchanges heat with the compressor. According to the water chiller adapting to high load, the precooler is added to cool high-temperature air, so that the temperature of the air for cooling and heat exchanging of the compressor is greatly reduced, and then the air exchanges heat with the compressor, so that the aim of reducing the temperature of the compressor body is fulfilled. Preferably, the water chiller is provided with a circulating liquid water return port, the circulating liquid water return port is connected with a liquid inlet of the precooler, the flow regulating valve is arranged on a pipeline between the circulating liquid water return port and the liquid inlet of the precooler, and a liquid outlet of the precooler is connected with a circulating liquid water outlet of the water chiller. Preferably, the fluid loop comprises an evaporation heat exchanger, the circulating liquid water return port is connected with a circulating liquid inlet of the evaporation heat exchanger, a circulating liquid outlet of the evaporation heat exchanger is connected with a water tank, and a water outlet of the water tank is connected with a water outlet of the water chiller. Preferably, the refrigerant circulation loop includes an evaporation heat exchanger, a refrigerant outlet of the evaporation heat exchanger is connected to a compressor inlet, the compressor inlet is connected to a condensation heat exchanger inlet, and the condensation heat exchanger outlet is connected to the evaporation heat exchanger inlet. Preferably, a circulating liquid backwater temperature sensor is arranged at the circulating liquid inlet of the evaporation heat exchanger. Preferably, a circulating liquid outlet pressure sensor and a circulating liquid outlet temperature sensor are arranged on a pipeline of a liquid outlet of the precooler and a circulating liquid outlet of the water chiller. Preferably, a refrigerant return air temperature sensor and a low-pressure refrigerant pressure sensor are arranged between the refrigerant outlet of the evaporation heat exchanger and the inlet of the compressor. Preferably, a temperature se