Refrigerating machine cooling water pollution discharge detection control device with cooling water pool

Abstract

The utility model provides a refrigerator cooling water pollution discharge detection control device with a cooling water tank, which comprises a PLC (programmable logic controller) control cabinet, a cooling water tank sampling pipe with a conductivity detector and a manual pollution discharge valve, and a cooling tower pollution discharge pipe with a bypass pollution discharge valve and a pollution discharge electric valve, the cooling tower blow-off pipe is arranged outside the cooling tower and is connected to the bottom of the cooling tower, so that two branches which are connected in parallel are formed, one branch serves as a blow-off main pipe and is provided with the blow-off electric valve, and the other branch serves as a blow-off bypass pipe and is provided with the bypass blow-off valve; and the conductivity detector and the blow-down electric valve are controlled by the PLC control cabinet. According to the utility model, the current situation that the water quality of cooling water of the refrigerator fluctuates due to manual pollution discharge during manual water quality testing can be improved, water resource waste caused by excessive pollution discharge is reduced, and the refrigerator runs more stably and economically, so that good water quality control and energy-saving effects are achieved.

Description

Technical Field

[0001] The utility model relates to a cooling water sewage discharge detection and control device for a refrigerator with a cooling water pool. Background Art

[0002] The cooling water system of a chiller with a cooling water pool provides cooling water through the cooling water pool after the chiller is running. The cooling water reaches the outdoor cooling tower after passing through the chiller, and returns to the cooling water pool after cooling down in the cooling tower. When part of the cooling water is lost due to evaporation after cooling down in the cooling tower, the water replenishment device will automatically open the municipal water supply to fill up the cooling water pool. In the process of continuous circulation of cooling water, the concentration ratio will gradually increase, the ions in the water will increase, the conductivity will increase, the calcium and magnesium ions will increase, the hardness will gradually increase, and the water quality will gradually deteriorate. In order to reduce the scaling of the chiller pipeline caused by the deterioration of water quality, resulting in reduced efficiency and other problems, it is necessary to discharge the cooling water through sewage discharge and add new water to achieve the purpose of controlling the cooling water quality. Usually, a sewage pipe is designed at the bottom of the cooling water pool, and a manual sewage valve is used for sewage discharge. The hardness of the cooling water is tested manually to monitor the water quality. Excessive sewage discharge will lead to a waste of water resources, which is mainly manifested in:

[0003] 1. The water quality of cooling water varies greatly in different parts during the circulation process. Since some new water is mixed in the cooling water pool, the concentration ratio here is relatively small. Discharging water here will increase the amount of sewage discharged, resulting in a waste of water resources.

[0004] Second, relying on manual testing of hardness has poor real-time performance, large fluctuations in water quality, and cannot be accurately controlled;

[0005] 3. Due to large fluctuations in water quality, emissions below water quality requirements will lead to excessive discharge of pollutants and waste of water resources.

[0006] The above three reasons are that in actual use, it is easy to cause unstable water quality during the operation of the refrigerator cooling water, and a large waste of water resources. Utility Model Content

[0007] In order to solve the above technical problems, the utility model proposes a refrigerator cooling water sewage discharge detection and control device with a cooling water pool, which can improve the current situation of refrigerator cooling water quality fluctuations caused by manual sewage discharge due to manual water quality testing, reduce water resource waste caused by excessive sewage discharge, and make the refrigerator operation more stable and economical, so as to achieve good water quality control and energy-saving effects.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A cooling water sewage discharge detection and control device for a refrigerator with a cooling water pool, the structural features of which are:

[0010] The cooling water in the cooling water pool is pumped to the refrigerator through the refrigerator water inlet pipe by the cooling water pump, discharged into the cooling tower through the refrigerator water outlet pipe after heat exchange in the refrigerator, and returned to the cooling water pool through the cooling tower water outlet pipe after cooling in the cooling tower;

[0011] The device also includes a PLC control cabinet, a cooling water pool sampling tube with a conductivity detector and a manual drain valve, and a cooling tower drain pipe with a bypass drain valve and a drain electric valve. The cooling water pool sampling tube is placed outside the cooling water pool and connected to the bottom end of the cooling water pool. The cooling tower drain pipe is placed outside the cooling tower and connected to the bottom of the cooling tower to form two parallel branches, one of which is used as a drain main pipe and is provided with the drain electric valve, and the other is used as a drain bypass pipe and is provided with the bypass drain valve. The conductivity detector and the drain electric valve are electrically connected to and controlled by the PLC control cabinet.

[0012] The structural features of the utility model also lie in:

[0013] The bypass drain valve is a manual valve.

[0014] The cooling water pool is connected to the water inlet of the cooling water pump through a cooling water pool outlet pipe, and the water outlet of the cooling water pump is connected to the water inlet pipe of the refrigerator.

[0015] Compared with the prior art, the beneficial effects of the utility model are embodied in:

[0016] The utility model configures a cooling water pool sampling tube with a conductivity detector for the cooling water pool, configures a cooling tower with a sewage pipe with a sewage electric valve, and connects the conductivity detector and the sewage electric valve to a PLC control cabinet. The system has reasonable design and reliable performance, and can effectively improve the control capability of sewage discharge of cooling water of a refrigerator with a cooling water pool, eliminate excessive sewage discharge caused by large fluctuations in manual control and discharge at a non-high concentration ratio position during sewage discharge of cooling water of the refrigerator, and avoid a large waste of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is the electric control principle diagram of the utility model.

[0019] In the figure, 1 is a PLC controller; 2 is a conductivity detector; 3 is an intermediate relay; 4 is a human-machine interface; 5 is a sewage electric valve; 6 is a cooling water tank; 7 is a cooling water tank outlet pipe; 8 is a cooling water pump; 9 is a refrigerator water inlet pipe; 10 is a refrigerator; 11 is a refrigerator outlet pipe; 12 is a cooling tower; 13 is a cooling tower outlet pipe; 14 is a manual sewage valve; 15 is a cooling water tank sampling tube; 16 is a sewage bypass pipe; 17 is a bypass sewage valve; 18 is a sewage main pipe. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Please refer to Figure 1 to Figure 2 The structure of the cooling water sewage discharge detection and control device of the refrigerator with a cooling water pool in this embodiment is set as follows:

[0022] The cooling water in the cooling water pool 6 is pumped to the refrigerator 10 through the refrigerator water inlet pipe 9 by the cooling water pump 8, and is discharged into the cooling tower 12 through the refrigerator water outlet pipe 11 after heat exchange in the refrigerator 10, and is cooled in the cooling tower 12 and flows back to the cooling water pool 6 through the cooling tower water outlet pipe 13;

[0023] The device also includes a PLC control cabinet, a cooling water pool sampling tube 15 with a conductivity detector 2 and a manual drain valve 14, and a cooling tower 12 drain pipe with a bypass drain valve 17 and a drain electric valve 5. The cooling water pool sampling tube 15 is placed outside the cooling water pool 6 and connected to the bottom of the cooling water pool 6. The cooling tower 12 drain pipe is placed outside the cooling tower 12 and connected to the bottom of the cooling tower 12, forming two parallel branches, one of which is used as a drain main pipe 18 and is provided with a drain electric valve 5, and the other is used as a drain bypass pipe 16 and is provided with a bypass drain valve 17. The conductivity detector 2 and the drain electric valve 5 are electrically connected and controlled by the PLC control cabinet.

[0024] In a specific implementation, the corresponding structural setting of the device also includes:

[0025] The bypass drain valve 17 is a manual valve.

[0026] The cooling water pool 6 is connected to the water inlet of a cooling water pump 8 through a cooling water pool outlet pipe 7 , and the water outlet of the cooling water pump 8 is connected to the water inlet pipe 9 of the refrigerator.

[0027] The electrical control schematic diagram of this device is as follows Figure 2 As shown, the figure shows a PLC controller 1, a conductivity detector 2, an intermediate relay 3, a human-machine interface 4 and a sewage electric valve 5.

[0028] The working process of this device can be carried out in the following way:

[0029] The cooling water of the refrigerator passes through the cooling water pool, is pressurized by the cooling pump and reaches the refrigerator. After heat exchange in the refrigerator, the cooling water flows through the cooling tower to cool down and then returns to the cooling water pool. During the circulation process, the cooling water needs to continuously evaporate water vapor in the cooling tower to achieve the cooling effect. When the conductivity detector detects that the conductivity of the cooling water in the cooling water pool exceeds the standard, it will be converted into a 4-20mA electrical signal and transmitted to the PLC control cabinet. After the PLC control cabinet converts the electrical signal into a data signal, it is compared with the preset value range. If it exceeds the upper limit of the preset value range, the electric sewage valve located below the cooling tower is controlled to open. Since the electric sewage valve is set on the sewage main pipe at the bottom of the cooling tower, it is located at the highest concentration ratio of the cooling water of the chiller with the cooling water pool, so that the high concentration ratio cooling water is discharged through the electric sewage valve until the value detected by the conductivity detector meets the preset value range. The PLC control cabinet controls the closing of the electric sewage valve, thereby achieving the control of the conductivity of the cooling water within a narrow standard range under the condition of a small sewage discharge, and minimizing the waste of water resources caused by excessive discharge of cooling water. The bypass sewage valve is set to play the role of manual emergency sewage discharge in the case of a sewage electric valve failure or a PLC control cabinet failure. The manual drain valve is set up to obtain water samples to calibrate the values ​​detected by the conductivity detector.

[0030] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cooling water discharge detection and control device for a refrigerator with a cooling water pool, characterized in that: The cooling water in the cooling water pool is pumped to the refrigerator through the refrigerator water inlet pipe by the cooling water pump, discharged into the cooling tower through the refrigerator water outlet pipe after heat exchange in the refrigerator, and returned to the cooling water pool through the cooling tower water outlet pipe after cooling in the cooling tower; The device also includes a PLC control cabinet, a cooling water pool sampling tube with a conductivity detector and a manual drain valve, and a cooling tower drain pipe with a bypass drain valve and a drain electric valve. The cooling water pool sampling tube is placed outside the cooling water pool and connected to the bottom end of the cooling water pool. The cooling tower drain pipe is placed outside the cooling tower and connected to the bottom of the cooling tower to form two parallel branches, one of which is used as a drain main pipe and is provided with the drain electric valve, and the other is used as a drain bypass pipe and is provided with the bypass drain valve. The conductivity detector and the drain electric valve are electrically connected to and controlled by the PLC control cabinet.

2. The cooling water sewage discharge detection and control device of a refrigerator with a cooling water pool according to claim 1 is characterized in that: The bypass drain valve is a manual valve.

3. The cooling water sewage discharge detection and control device of a refrigerator with a cooling water pool according to claim 1 is characterized in that: The cooling water pool is connected to the water inlet of the cooling water pump through a cooling water pool outlet pipe, and the water outlet of the cooling water pump is connected to the water inlet pipe of the refrigerator.

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