CN205332903U - Industry refrigeration cycle water system - Google Patents

Abstract

The utility model discloses an industrial cooling circulating water system, which comprises a cooling tower, a circulating water pump, a water supply pipeline and a frequency conversion controller. The water outlet of the circulating water pump communicates with the water inlet of the cooled equipment through the water supply pipe, and the water outlet of the cooled equipment communicates with the water return port of the cooling tower through the water return pipe; it also includes a first temperature sensor arranged at the water outlet of the cooling tower, The second temperature sensor arranged at the water return port of the cooling tower, the third temperature sensor arranged at the water inlet of the cooled equipment, the fourth temperature sensor arranged at the water outlet of the cooled equipment and the PID controller; the first temperature sensor, The second temperature sensor, the third temperature sensor and the fourth temperature sensor are all electrically connected to the PID controller, and the PID controller is electrically connected to the frequency conversion controller. The utility model has the characteristics of precise adjustment, energy saving and emission reduction.

Description

An industrial cooling circulating water system

technical field

The utility model relates to an industrial cooling technology, more specifically, it relates to an industrial cooling circulating water system.

Background technique

The traditional cooling circulating water system includes circulating water pumps, supporting motors, end users (heat exchangers, etc.), cooling towers, pipe valves, etc. The system mainly uses the principle of heat exchange and uses circulating water as a medium to take away end users (heat exchangers, etc.) ) The heat generated by the operation is exchanged to the atmosphere through the cooling tower. Throughout the process, the total heat transfer of the system is affected by factors such as system capacity, climate, cooling tower efficiency, and pipelines. The circulating water pump needs to be adjusted frequently. At present, the water supply adjustment of the system mainly adopts throttle valve, manual frequency conversion adjustment, and constant pressure frequency conversion adjustment. The throttling valve is used to adjust the loss of the pipeline along the system to change the water supply of the system and adjust the total heat transfer. Manual frequency conversion adjustment, using manual adjustment of the frequency of the motor frequency conversion controller, changing the speed of the supporting motor of the circulating water pump, and adjusting the operating conditions of the system to adapt to the changes in system operation. Constant pressure frequency conversion adjustment, the signal source of the frequency conversion controller is the system water supply pressure signal, using frequency conversion to achieve constant pressure or variable pressure adjustment.

The above-mentioned prior art has defects such as high energy consumption of the system, simple operation but heavy workload, low adjustment accuracy, and difficulty in adjusting to the optimum working point.

Utility model content

In view of the deficiencies in the prior art, the purpose of the utility model is to provide an industrial cooling circulating water system, which has the characteristics of precise adjustment, energy saving and emission reduction.

In order to achieve the above object, the utility model provides the following technical solutions:

An industrial cooling circulating water system, comprising a cooling tower, a circulating water pump, a water supply pipeline and a frequency conversion controller, the frequency converter is electrically connected to the circulating water pump, the water inlet of the circulating water pump is connected to the water outlet of the cooling tower through a pipeline, and the The water outlet of the circulating water pump communicates with the water inlet of the cooled equipment through the water supply pipeline, and the water outlet of the cooled equipment communicates with the water return port of the cooling tower through the water return pipeline; A temperature sensor, a second temperature sensor arranged at the water return port of the cooling tower, a third temperature sensor arranged at the water inlet of the cooled equipment, a fourth temperature sensor arranged at the water outlet of the cooled equipment, and a PID controller; The first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor are all electrically connected to the PID controller, and the PID controller is electrically connected to the frequency conversion controller.

Further, an exhaust valve is also provided on the pipeline between the cooling tower and the circulating water pump.

Further, a deaerator is installed on the return water pipeline.

Further, a mixing bed and a resin trap are also installed on the return water pipe.

Further, it also includes a supplementary water tank, a supplementary water pump and a water level sensor, the water level sensor is installed in the cooling tower, the water inlet of the supplementary water pump is connected to the supplementary water pool, and the water outlet is connected to the cooling tower. It is electrically connected with the frequency conversion controller.

Further, a self-cleaning filter is connected to the water outlet of the supplementary water pump.

Further, it also includes a first electric three-way valve and a second electric three-way valve, the water inlet of the first electric three-way valve communicates with the water outlet of the self-cleaning filter, one of the water outlets communicates with the cooling tower, and the other One water outlet is connected to the water supply pipeline; the water inlet of the second electric three-way valve is connected to the outlet of the resin trap, one of the water outlets is connected to the cooling tower, and the other water outlet is connected to the replenishment pool.

Compared with the prior art, the utility model has the advantages of: through the above technical scheme, the temperature of the cooling tower’s supply and return water, the temperature of the equipment to be cooled, etc. Reference, so that the frequency conversion controller can accurately control the working frequency of the circulating water pump, to achieve constant temperature operation of the circulating water system medium, precise adjustment, energy saving and emission reduction.

Description of drawings

Fig. 1 is the system schematic diagram of the industrial cooling circulating water system in the utility model.

detailed description

Referring to Figure 1, an industrial cooling circulating water system includes a cooling tower, a circulating water pump, a water supply pipeline and a frequency conversion controller. The water outlet of the water pump communicates with the water inlet of the cooled equipment through the water supply pipeline, and the water outlet of the cooled equipment communicates with the water return port of the cooling tower through the water return pipeline; it also includes a first temperature sensor arranged at the water outlet of the cooling tower, a set The second temperature sensor at the water return port of the cooling tower, the third temperature sensor arranged at the water inlet of the cooled equipment, the fourth temperature sensor and the PID controller arranged at the water outlet of the cooled equipment; the first temperature sensor, the first The second temperature sensor, the third temperature sensor and the fourth temperature sensor are all electrically connected to the PID controller, and the PID controller is electrically connected to the variable frequency controller. Through the above technical scheme, the temperature of the supply and return water of the cooling tower, the temperature of the equipment to be cooled, etc. are used as signal sources, and after the calculation of the PID controller, a reliable reference is given to the frequency conversion controller, so that the frequency conversion controller can accurately control the circulating water pump. The working frequency can achieve the constant temperature operation of the circulating water system medium, precise adjustment, energy saving and emission reduction.

In addition, there is an exhaust valve on the pipeline between the cooling tower and the circulating water pump, so that the air in the circulation system medium can be discharged in time, the air pressure in the pipeline can be kept constant, and the pipe burst caused by excessive air pressure can be prevented.

At the same time, in order to avoid rapid oxidation of the inner wall of the pipeline and prolong the service life, in this embodiment, a deaerator is installed on the return water pipeline, so as to better remove oxygen in the medium.

Further, a mixing bed and a resin trap are also installed on the return water pipe.

Since the cooling tower will continuously lose water during the working process, it is necessary to replenish the circulation system. In this embodiment, in order to achieve the above purpose, a replenishment pool, a replenishment water pump, and a water level sensor are set up accordingly. , The water level sensor is electrically connected with the frequency conversion controller. When the water level in the cooling tower is insufficient, the frequency conversion controller controls the water supply pump to supply water to the cooling tower. At the same time, the water outlet of the water supply pump is connected with a self-cleaning filter to filter the water provided by the water supply pool to ensure the water supply in the circulation system. The water is pure.

In addition, in order to prevent the entire circulation system from being unable to work when the cooling tower is damaged, a set of backup loops is also designed in this embodiment, specifically, the first electric three-way valve and the second electric three-way valve are added, wherein, The water inlet of the first electric three-way valve is connected with the water outlet of the self-cleaning filter, one of the water outlets is connected with the cooling tower, and the other water outlet is connected with the water supply pipeline; the water inlet of the second electric three-way valve is connected with the resin trap The outlets are connected, one of the outlets is connected with the cooling tower, and the other outlet is connected with the make-up pool. Therefore, when the cooling is damaged, the first electric three-way valve and the second electric three-way valve can be controlled to supply water directly to the circulation system from the supplementary water pool, thereby avoiding the collapse of the entire circulation system when the cooling tower is repaired.

The above descriptions are only preferred implementations of the present utility model, and the protection scope of the present utility model is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present utility model all belong to the protection scope of the present utility model. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims (7)

1. An industrial cooling circulating water system, comprising a cooling tower, a circulating water pump, a water supply pipeline and a frequency conversion controller, the frequency converter is electrically connected to the circulating water pump, and the water inlet of the circulating water pump communicates with the water outlet of the cooling tower through a pipeline , the water outlet of the circulating water pump communicates with the water inlet of the cooled equipment through the water supply pipeline, and the water outlet of the cooled equipment communicates with the water return port of the cooling tower through the water return pipeline; it is characterized in that it also includes The first temperature sensor at the water outlet of the cooling tower, the second temperature sensor at the water return port of the cooling tower, the third temperature sensor at the water inlet of the equipment to be cooled, the fourth temperature sensor at the water outlet of the equipment to be cooled, and PID controller; the first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor are all electrically connected to the PID controller, and the PID controller is electrically connected to the frequency conversion controller. 2. The industrial cooling circulating water system according to claim 1, characterized in that an exhaust valve is also provided on the pipeline between the cooling tower and the circulating water pump. 3. The industrial cooling circulating water system according to claim 2, wherein a deaerator is installed on the return water pipeline. 4. The industrial cooling circulating water system according to claim 3, wherein a mixed bed and a resin catcher are also installed on the return water pipe. 5. The industrial cooling circulating water system according to claim 4, characterized in that, it also includes a replenishment pool, a replenishment water pump and a water level sensor, the water level sensor is installed in the cooling tower, and the water inlet of the replenishment water pump and the replenishment pool The water outlet is connected to the cooling tower, and the water supply pump and the water level sensor are electrically connected to the frequency conversion controller. 6. The industrial cooling circulating water system according to claim 5, wherein a self-cleaning filter is connected to the water outlet of the replenishing water pump. 7. The industrial cooling circulating water system according to claim 6, further comprising a first electric three-way valve and a second electric three-way valve, the water inlet of the first electric three-way valve is connected to the self-cleaning filter The water outlet of the device is connected, one of the water outlets is connected with the cooling tower, and the other water outlet is connected with the water supply pipeline; the water inlet of the second electric three-way valve is connected with the outlet of the resin trap, and one of the water outlets is connected with the cooling tower connected, and the other water outlet is connected with the supplementary water pool.