Anti-freezing water chilling unit and control system thereof

Abstract

The utility model discloses a control system of an anti-freezing water chilling unit, which comprises a cooling tower, a cooling water pump and a water chilling unit, the cooling tower, the cooling water pump and the water chilling unit are connected in series in a pipeline, a water storage tank positioned between the cooling tower and the cooling water pump is arranged in the pipeline, and two conveying pipes are arranged in the pipeline in parallel. The second temperature sensor is mounted close to a water inlet of the water chilling unit; the utility model further discloses the water chilling unit according to any one of claims 1-9, and the water chilling unit and the cooling water pump are connected in series in a pipeline. The cooling water temperature control system is reasonable in structure, convenient to refit, high in practicability, low in energy consumption and high in practicability, achieves automatic control of water inlet temperature of the water chilling unit in the cooling water temperature control system through the electric adjusting valve, the temperature sensor, the water storage tank, the cooling tower fan and the cooling water pump, guarantees normal operation, and is beneficial to prolonging the service life of the water chilling unit. And the method has a bright application prospect.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling water systems, in particular to an antifreeze chiller and a control system thereof. Background Art

[0002] At present, cooling water systems are widely used in various industrial refrigeration fields. The existing cooling water system includes a cooling tower, a cooling water pump and a chiller. The chiller consists of a compressor, an evaporator, a condenser, etc. The condenser outlet of the chiller is connected to the cooling tower inlet, and the cooling tower outlet is connected to the condenser inlet. The cooling water pump is located on the pipeline between the condenser and the cooling tower to provide power for the cooling water to circulate in the pipeline. The cooling water system achieves the cooling effect through the repeated operation of the chiller and the cooling tower.

[0003] As an important cold source in the cooling water system, the start-up of the chiller is affected by the inlet water temperature. When the outdoor temperature is low in winter, the chiller often fails to start normally due to the low inlet water temperature. Different models of chillers from different manufacturers have different requirements for the start-up temperature. In addition, the phenomenon of freezing of water pipes in winter also occurs from time to time. Therefore, we propose an antifreeze chiller and its control system to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to solve the above technical problems. The purpose of the utility model is to add a temperature control flow adjustment frequency change and water storage device on the basis of the existing cooling water system, so as to form an antifreeze and temperature control system for the cooling water of the chiller in winter, so as to ensure that the chiller can start normally under low temperature conditions in winter.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An antifreeze chiller and its control system, comprising a cooling tower, a cooling water pump and a chiller, wherein the cooling tower, the cooling water pump and the chiller are connected in series in a pipeline, wherein a water storage tank located between the cooling tower and the cooling water pump is installed in the pipeline, wherein two delivery pipes are installed in parallel in the pipeline, and an electric regulating valve and a bypass valve are installed respectively in the two delivery pipes.

[0007] Preferably, a first temperature sensor is installed in the pipeline, and the first temperature sensor is installed close to the water outlet of the cooling tower.

[0008] Preferably, a second temperature sensor is installed in the pipeline, and the second temperature sensor is installed close to the water inlet of the chiller.

[0009] Preferably, the two delivery pipes are located between the water storage tank and the cooling water pump.

[0010] Preferably, the cooling tower is equipped with a fan, the fan is operated in variable frequency, and the operating frequency of the fan is controlled by a first temperature sensor.

[0011] Preferably, the cooling water pump is operated by variable frequency, and the operating frequency of the cooling water pump is controlled by a second temperature sensor, thereby meeting the water inlet requirements of the chiller while reducing energy consumption.

[0012] Preferably, the second temperature sensor monitors the water inlet temperature of the chiller to control the opening and closing degree of the electric regulating valve and the operating frequency of the cooling water pump, thereby adjusting the flow rate of cooling water flowing into the chiller.

[0013] Preferably, the water storage tank can store cooling water to buffer the cooling water flowing in the pipeline.

[0014] Preferably, the cooling water in the pipeline circulates through the water storage tank, the cooling water pump, the chiller, the cooling tower and the water storage tank.

[0015] The utility model also discloses a water chiller, wherein the water chiller and a cooling water pump are connected in series in a pipeline.

[0016] The beneficial effects of the utility model are:

[0017] The utility model has a reasonable structure and is easy to modify. Through an electric regulating valve, a temperature sensor, a water storage tank, a cooling tower fan and a cooling water pump with variable frequency operation, the utility model realizes automatic control of the water inlet temperature of the chiller in the cooling water temperature control system, ensures its normal operation, and is beneficial to extending the service life of the chiller. It has strong practicality, low energy consumption and a bright application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 It is a control principle diagram of the utility model.

[0020] In the figure: 1 chiller, 2 cooling tower, 3 water storage tank, 4 cooling water pump, 5 second temperature sensor, 6 electric regulating valve, 7 bypass valve, 8 first temperature sensor. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Reference Figure 1-2, an antifreeze chiller and its control system, comprising a cooling tower 2, a cooling water pump 4 and a chiller 1, the cooling tower 2 is equipped with a fan, the fan adopts variable frequency operation, the operating frequency of the fan is controlled by a first temperature sensor 8, the cooling water pump 4 adopts variable frequency operation, the operating frequency of the cooling water pump 4 is controlled by a second temperature sensor 5, the water inlet requirements of the chiller 1 are met while reducing energy consumption, the second temperature sensor 5 monitors the water inlet temperature of the chiller 1 to control the opening and closing degree of the electric regulating valve 6 and the operating frequency of the cooling water pump 4, and adjusts the flow of cooling water flowing into the chiller 1;

[0023] The cooling tower 2, the cooling water pump 4 and the chiller 1 are connected in series in the pipeline, and the cooling water in the pipeline circulates through the water storage tank 3, the cooling water pump 4, the chiller, the cooling tower 2 and the water storage tank 3;

[0024] A water storage tank 3 is installed in the pipeline between the cooling tower 2 and the cooling water pump 4. The water storage tank 3 can store cooling water and play a buffering role for the cooling water flowing in the pipeline. In addition, in winter, under low temperature conditions, the cooling water in the system water pipeline can be drained into the water storage tank 3 to prevent the pipeline from freezing;

[0025] Two delivery pipes are installed in parallel in the pipeline, and the two delivery pipes are located between the water storage tank 3 and the cooling water pump 4; the two delivery pipes are respectively installed with an electric regulating valve 6 and a bypass valve 7 to ensure that the chiller 1 can start normally and maintain stable operation under low temperature conditions in winter, while achieving energy saving effect;

[0026] Wherein, a first temperature sensor 8 is installed in the pipeline, and the first temperature sensor 8 is installed close to the water outlet of the cooling tower 2, which can achieve energy saving effect;

[0027] Among them, a second temperature sensor 5 is installed in the pipeline, and the second temperature sensor 5 is installed close to the water inlet of the chiller 1, which can achieve energy saving effect;

[0028] The utility model also discloses a water chiller. The water chiller 1 and a cooling water pump 4 are connected in series in a pipeline.

[0029] Specifically, it can be reflected as follows: adding a water storage tank 3 connected in series with the cooling tower 2, the cooling water pump 4 and the chiller 1 to realize the water storage function, further assist in meeting the system flow control requirements, and be able to vent the water pipeline under extremely cold conditions to prevent it from freezing; adding a second temperature sensor 5 to monitor the inlet water temperature of the chiller 1 and a first temperature sensor 8 to monitor the outlet water temperature of the cooling tower 2; changing the operating mode of the cooling tower fan and the cooling water pump in the original system to variable frequency operation, the operating frequency of the cooling water pump 4 is controlled by the second temperature sensor 5, and the operating frequency of the cooling tower 2 fan is controlled by the first temperature sensor 8; adding an electric regulating valve 6 and a bypass valve 7 connected in parallel with the cooling tower 2, the cooling water pump 4, the chiller 1 and the water storage tank 3, and the opening and closing degree of the electric regulating valve 6 is controlled by the temperature sensor 5.

[0030] The working principle of the utility model is as follows: Figure 2 Under normal conditions, the electric regulating valve 6 is closed, the cooling water pump 4 maintains the minimum water inlet flow of the chiller 1, and the first temperature sensor 8 monitors the outlet water temperature of the cooling tower 2 in real time, and inputs the temperature signal to control the operating frequency of the cooling tower 2 fan to avoid energy waste. When the inlet water temperature of the chiller is lower than the preset temperature in winter, the electric regulating valve 6 is fully opened, and the outlet water of the chiller 1 is directly returned to the inlet water pipeline of the chiller 1 until the inlet water temperature of the chiller 1 is higher than the preset temperature. During this period, the second temperature sensor 5 monitors the inlet water temperature of the chiller 1 in real time, and inputs the temperature signal to control the electric regulating valve 6 to gradually close as the inlet water temperature of the chiller 1 increases. At this time, the chiller 1 can operate normally. The system is also equipped with a standby bypass valve 7, which can manually adjust the valve F when the electric regulating valve 6 fails, providing emergency measures for the inlet water temperature control of the chiller 1. Subsequently, if the water inlet temperature of the chiller 1 drops to a preset temperature, the second temperature sensor 5 inputs a temperature signal to increase the operating frequency of the cooling water pump 4, thereby increasing the water inlet flow rate of the chiller 1, shortening the residence time of the cooling water in the chiller 1, and increasing the water outlet temperature of the chiller 1, so that the cooling water can finally meet the temperature requirement at the inlet of the chiller 1.

[0031] The cooling water temperature control system can ultimately achieve the following effects: by monitoring the inlet water temperature of the chiller 1 and the outlet water temperature of the cooling tower 2, the electric regulating valve 6 is controlled to ultimately adjust the ratio of the outlet water of the cooling tower 2 to the return cooling water, the operating frequency of the cooling tower 2 fan is controlled to ultimately adjust the cooling water temperature at the outlet of the cooling tower 2, the operating frequency of the cooling water pump 4 is controlled to ultimately adjust the residence time of the cooling water in the chiller 1, and the cooling water temperature at the water inlet of the chiller 1 is increased through multiple channels to meet the startup requirements of the chiller 1 in winter.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A control system for an antifreeze chiller, comprising a cooling tower (2), a cooling water pump (4) and a chiller (1), wherein the cooling tower (2), the cooling water pump (4) and the chiller (1) are connected in series in a pipeline, characterized in that: The pipeline is provided with a water storage tank (3) located between a cooling tower (2) and a cooling water pump (4), and two delivery pipes are installed in parallel in the pipeline. The two delivery pipes are respectively provided with an electric regulating valve (6) and a bypass valve (7).

2. The control system of the antifreeze chiller according to claim 1, characterized in that: A first temperature sensor (8) is installed in the pipeline, and the first temperature sensor (8) is installed close to the water outlet of the cooling tower (2).

3. The control system of the antifreeze chiller according to claim 1, characterized in that: A second temperature sensor (5) is installed in the pipeline, and the second temperature sensor (5) is installed close to the water inlet of the chiller (1).

4. The control system of the antifreeze chiller according to claim 1, characterized in that: The two delivery pipes are located between the water storage tank (3) and the cooling water pump (4).

5. The control system of the antifreeze chiller according to claim 1, characterized in that: The cooling tower (2) is equipped with a fan which is operated in a variable frequency manner, and the operating frequency of the fan is controlled by a first temperature sensor (8).

6. The control system of the antifreeze chiller according to claim 3, characterized in that: The cooling water pump (4) is operated in variable frequency mode, and the operating frequency of the cooling water pump (4) is controlled by a second temperature sensor (5), thereby satisfying the water inlet requirements of the chiller (1) while reducing energy consumption.

7. The control system of the antifreeze chiller according to claim 3, characterized in that: The second temperature sensor (5) monitors the water inlet temperature of the chiller (1) to control the opening and closing degree of the electric regulating valve (6) and the operating frequency of the cooling water pump (4), thereby adjusting the flow rate of cooling water flowing into the chiller (1).

8. The control system of the antifreeze chiller according to claim 1, characterized in that: The water storage tank (3) can store cooling water and play a buffering role on the cooling water flowing in the pipeline.

9. The control system of the antifreeze chiller according to claim 1, characterized in that: The cooling water in the pipeline circulates through the water storage tank (3), the cooling water pump (4), the chiller, the cooling tower (2), and the water storage tank (3).

10. A chiller, characterized in that: Applicable to a control system as claimed in any one of claims 1 to 9, wherein the chiller (1) and the cooling water pump (4) are connected in series in a pipeline.

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