Automatic sampling, detecting and alarming device for refrigerant water

Abstract

The utility model discloses a kind of refrigerant water automatic sampling detection alarm device, comprising: liquid storage tank, pressure sensor, liquid level controller, conductivity controller, vacuum pump and PLC controller.The utility model realizes refrigerant water detection full-process automation, through PLC device accurate linkage pressure sensor, liquid level controller, conductivity controller, vacuum pump and solenoid valve, sampling, detection and reset are automatically completed according to set period, without manual intervention throughout, greatly improve detection efficiency.Conductivity controller real-time detects the conductivity of refrigerant water, immediately triggers alarm once exceeding, effectively avoid the unit failure caused by refrigerant water pollution.After detection is completed, sample in liquid storage tank can be automatically backflow to evaporator, save manual processing link, reduce labor intensity, ensure whole process stable and reliable, data accurate simultaneously, provide powerful guarantee for safe and efficient operation of refrigeration unit.

Description

Technical Field

[0001] This utility model relates to an automatic sampling and detection alarm device for refrigerant water. Background Technology

[0002] During the operation of a lithium bromide refrigeration system, if the refrigerant water in the evaporator becomes contaminated with lithium bromide solution, it constitutes refrigerant water contamination. This problem directly disrupts the thermodynamic properties of the refrigerant water, leading not only to a significant decrease in the unit's cooling efficiency but also interfering with the system's operational stability.

[0003] The degree of refrigerant water contamination can be directly reflected by changes in its conductivity, but traditional detection methods have significant limitations: they rely on periodic manual sampling and laboratory analysis, which not only results in long detection cycles and poor timeliness, making it difficult to capture subtle changes in the early stages of contamination, but also requires continuous investment in labor costs. Furthermore, sampling errors and environmental interference during manual operation can easily lead to fluctuations in detection accuracy. This passive detection mode cannot achieve real-time dynamic monitoring of refrigerant water quality, and it is even more difficult to link the system to trigger automatic alarms, making it difficult to meet the needs of modern automated refrigeration units. Utility Model Content

[0004] The main purpose of this invention is to provide an automatic sampling and detection alarm device for refrigerant water to solve the problems mentioned in the background art.

[0005] The objective of this utility model can be achieved by adopting the following technical solution: An automatic sampling and detection alarm device for refrigerant water includes: A liquid storage tank, the bottom of which is connected to the evaporator of the refrigeration unit, a first solenoid valve is provided between the liquid storage tank and the evaporator of the refrigeration unit, and a second solenoid valve is provided at the top of the liquid storage tank; A pressure sensor, which is mounted on the liquid storage tank; A liquid level controller, wherein the liquid level controller is disposed on the top of the liquid storage tank and its electrode rod is inserted into the liquid storage tank; A conductivity controller, wherein the conductivity controller is disposed at the top of the liquid storage tank and its detection rod is inserted into the liquid storage tank; A vacuum pump is connected to one side of a liquid storage tank, and a third solenoid valve is provided between the vacuum pump and the liquid storage tank. The PLC controller receives detection signals from the pressure sensor, level controller, and conductivity controller, controls the start and stop of the vacuum pump, and controls the opening and closing of the first, second, and third solenoid valves.

[0006] Preferably, the bottom of the liquid storage tank is provided with a liquid bladder, and the liquid bladder of the liquid storage tank is connected to the evaporator of the refrigeration unit.

[0007] Preferably, the liquid storage tank is provided with a liquid level observation window on its body.

[0008] Preferably, the liquid level controller includes a high liquid level electrode rod and a low liquid level electrode rod.

[0009] Preferably, the detection rod of the conductivity controller is inserted into the middle of the liquid storage tank.

[0010] Preferably, a fourth solenoid valve is also provided between the vacuum pump and the liquid storage tank, and the fourth solenoid valve is electrically connected to the PLC controller.

[0011] Preferably, it also includes an alarm, which is electrically connected to the PLC controller.

[0012] The beneficial technical effects of this utility model are as follows: This invention automates the entire refrigerant water testing process. A PLC precisely links a pressure sensor, level controller, conductivity controller, vacuum pump, and solenoid valve, automatically completing sampling, testing, and resetting according to a set cycle. The entire process requires no manual intervention, significantly improving testing efficiency. The conductivity controller monitors the refrigerant water's conductivity in real time, triggering an alarm immediately if it exceeds the standard, effectively preventing unit malfunctions caused by refrigerant water contamination. After testing, the sample in the storage tank automatically flows back to the evaporator, eliminating manual processing, reducing labor intensity, and ensuring the entire process is stable, reliable, and accurate, providing strong support for the safe and efficient operation of the refrigeration unit. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0014] In the diagram: 1. Storage tank; 2. First solenoid valve; 3. Second solenoid valve; 4. Pressure sensor; 5. Liquid level controller; 6. Conductivity controller; 7. Vacuum pump; 8. Third solenoid valve; 9. PLC controller; 10. Liquid bladder; 11. Liquid level observation window; 12. High liquid level electrode rod; 13. Low liquid level electrode rod; 14. Fourth solenoid valve; 15. Alarm; 16. Evaporator. Detailed Implementation

[0015] To enable those skilled in the art to understand the technical solution of this utility model more clearly, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of this utility model is not limited thereto.

[0016] like Figure 1 As shown, the automatic refrigerant water sampling and detection alarm device provided in this embodiment includes: The liquid storage tank 1 is connected at its bottom to the evaporator 16 of the refrigeration unit. A first solenoid valve 2 is installed between the liquid storage tank 1 and the evaporator 16, and a second solenoid valve 3 is installed at the top of the liquid storage tank 1. The bottom connection allows gravity to assist the flow of refrigerant water, and the pressure difference enhances the liquid absorption efficiency. The first solenoid valve 2 acts as an on / off switch, precisely controlling the connection and disconnection between the liquid storage tank 1 and the evaporator 16, avoiding unnecessary flow during non-detection periods and ensuring system independence. The second solenoid valve 3 at the top is used for pressure release. It opens during reset, allowing the liquid storage tank 1 to return to atmospheric pressure without manual operation, achieving automated pressure regulation. At the same time, it prevents external air impurities from entering the liquid storage tank 1 unnecessarily, ensuring the purity of the refrigerant water sample.

[0017] Pressure sensor 4 is installed on the liquid storage tank 1; it monitors the pressure inside the liquid storage tank 1 in real time, provides a precise pressure signal to the PLC controller 9, ensures that the pressure in the liquid storage tank 1 reaches a value lower than the set value of the evaporator 16 during the vacuuming process, and ensures stable power for the intake of refrigerant water; at the same time, it confirms whether the pressure has returned to atmospheric pressure during the reset phase to avoid misoperation.

[0018] The liquid level controller 5 is located on the top of the liquid storage tank 1 and its electrode rod is inserted into the liquid storage tank 1 to detect the liquid level height in the liquid storage tank 1. Conductivity controller 6 is installed on top of the liquid storage tank 1 and its detection rod is inserted into the liquid storage tank 1; it directly detects the conductivity of the refrigerant water in the liquid storage tank 1 without the need for additional sampling, reducing the risk of contamination and reflecting the contamination status of the refrigerant water in the evaporator 16 in real time. Vacuum pump 7 is connected to one side of liquid storage tank 1. A third solenoid valve 8 is installed between vacuum pump 7 and liquid storage tank 1. It provides stable negative pressure to liquid storage tank 1, creating the condition that "liquid storage tank pressure < evaporator pressure", driving refrigerant water to be automatically drawn in without manual vacuuming, thus improving the degree of automation. The PLC controller 9 receives detection signals from the pressure sensor 4, the level controller 5, and the conductivity controller 6, and controls the start and stop of the vacuum pump 7, as well as the opening and closing of the first solenoid valve 2, the second solenoid valve 3, and the third solenoid valve 8. This achieves full-process automation, including timed detection, negative pressure control, liquid aspiration, alarm activation, and reset, reducing manual intervention and operational errors. It also supports programming to modify parameters and adapt to different operating conditions.

[0019] In this embodiment, as Figure 1As shown, a liquid bladder 10 is installed at the bottom of the storage tank 1, and the liquid bladder 10 of the storage tank 1 is connected to the evaporator 16 of the refrigerator. The liquid bladder 10 is designed to buffer the impact when refrigerant water is drawn in, reducing the impact of liquid level fluctuations on the detection; at the same time, when the storage tank 1 is emptied, the deformation of the liquid bladder 10 can help to discharge residual liquid, avoid refrigerant water retention, and ensure the thoroughness of sampling and return. In this embodiment, as Figure 1 As shown, a liquid level observation window 11 is provided on the tank body of the storage tank 1. This provides a visual window, allowing operators to directly observe the liquid level status inside the storage tank 1 during operation or malfunction, assisting in determining whether the device is working properly and improving maintenance convenience.

[0020] In this embodiment, as Figure 1 As shown, the liquid level controller 5 includes a high liquid level electrode rod 12 and a low liquid level electrode rod 13. The high liquid level electrode rod 12 is located 5 cm below the top of the liquid storage tank 1 to prevent the refrigerant water in the liquid storage tank 1 from overflowing and triggering the closing of the first solenoid valve 2 to protect the device. The low liquid level electrode rod 13 is located 3 mm above the bottom of the liquid bladder 10. When resetting and returning the refrigerant water, it confirms that the liquid storage tank 1 has been emptied and triggers the closing of the first solenoid valve 2 to avoid incomplete return.

[0021] In this embodiment, as Figure 1 As shown, the detection rod of the conductivity controller 6 is inserted into the middle of the storage tank 1 to ensure that the coolant water level covers the detection rod during sampling, so as to avoid detection failure due to low liquid level and ensure the accuracy of conductivity data.

[0022] In this embodiment, as Figure 1 As shown, a fourth solenoid valve 14 is also provided between the vacuum pump 7 and the liquid storage tank 1. The fourth solenoid valve 14 is electrically connected to the PLC controller 9, providing double shutdown protection to prevent liquid backflow and damage to the vacuum pump 7.

[0023] In this embodiment, as Figure 1 As shown, it also includes an alarm 15, which is electrically connected to the PLC controller 9. The alarm 15 can be equipped with an audible and visual alarm. When the conductivity exceeds the standard, it will promptly sound an alarm through sound and light to remind the operator to take action, so as to avoid the contaminated refrigerant water affecting the efficiency of the refrigeration unit or damaging the equipment, and reduce the risk of the failure escalating.

[0024] The specific workflow is as follows: 1) System initialization: When the device power is turned on, the PLC controller 9 performs a self-test, confirming that the first solenoid valve 2, the third solenoid valve 8 and the fourth solenoid valve 14 are in the closed state, the second solenoid valve 3 is in the open state, the pressure display of the liquid storage tank 1 is one atmosphere, and the system enters the standby state.

[0025] 2) Timed start detection: The detection cycle is set through PLC controller 9, such as once every two hours. After the set time is reached, PLC controller 9 issues a command to start vacuum pump 7, and at the same time opens the third solenoid valve 8 and the fourth solenoid valve 14, closes the second solenoid valve 3, and vacuum pump 7 starts to pump air from storage tank 1.

[0026] 3) Negative pressure detection and control: Pressure sensor 4 transmits the pressure signal in the liquid storage tank 1 to PLC controller 9 in real time. When the pressure drops to the set negative pressure value and forms a negative pressure value lower than that in the evaporator 16 of the lithium bromide refrigerator, PLC controller 9 issues a command to close the third solenoid valve 8 and the fourth solenoid valve 14 and stop the operation of vacuum pump 7. At this time, a stable negative pressure is formed in the liquid storage tank 1.

[0027] 4) Refrigerant water intake: The PLC device controls the opening of the first solenoid valve 2. Both the liquid storage tank 1 and the lithium bromide refrigerator evaporator 16 are under negative pressure. The pressure in the liquid storage tank 1 is lower than the pressure in the lithium bromide refrigerator evaporator 16. The refrigerant water in the evaporator 16 is drawn into the liquid storage tank 1 under the action of pressure difference, and the liquid level in the liquid storage tank 1 gradually rises.

[0028] 5) Liquid level and conductivity detection: When the liquid level in the storage tank 1 rises to the high liquid level detection point, the liquid level controller 5 sends a high liquid level signal to the PLC controller 9. The PLC controller 9 receives the signal and controls the first solenoid valve 2 to close, stopping the refrigerant water intake. At the same time, the conductivity controller 6 is started to detect the conductivity of the refrigerant water.

[0029] 6) Pollution alarm: If the conductivity controller 6 detects that the conductivity reaches 100us / cm, the PLC controller 9 determines that the refrigerant water is polluted and triggers the alarm 15 to issue an alarm signal.

[0030] 7) Reset Process: After the operator confirms the alarm, a reset operation is performed on the control panel of PLC controller 9. PLC controller 9 controls the opening of the second solenoid valve 3, and the pressure in the liquid storage tank 1 is released to one atmosphere through the second solenoid valve 3. After the pressure sensor 4 detects the pressure, PLC controller 9 controls the opening of the first solenoid valve 2. Since the evaporator 16 of the lithium bromide refrigerator is still under negative pressure, a pressure difference is formed between the liquid storage tank 1 and the evaporator 16. The refrigerant water in the liquid storage tank 1 is re-drawn into the evaporator 16 under the action of the pressure difference.

[0031] 8) Cycle preparation: When the liquid level in the storage tank 1 drops to the low liquid level detection point, the liquid level controller 5 sends a low liquid level signal, and the PLC controller 9 controls the first solenoid valve 2 to close, the system returns to the initial state, and waits for the next detection cycle to begin.

[0032] In summary, this embodiment achieves full automation of the refrigerant water detection process. Through precise linkage between the PLC controller 9 and the pressure sensor 4, level controller 5, conductivity controller 6, vacuum pump 7, and solenoid valve, sampling, detection, and resetting are automatically completed according to a set cycle, requiring no manual intervention and significantly improving detection efficiency. The conductivity controller 6 monitors the conductivity of the refrigerant water in real time, triggering an alarm immediately if it exceeds the standard, effectively preventing unit malfunctions caused by refrigerant water contamination. After detection, the sample in the storage tank 1 can be automatically returned to the evaporator 16, eliminating manual processing, reducing labor intensity, and ensuring the entire process is stable, reliable, and accurate, providing strong support for the safe and efficient operation of the refrigeration unit.

[0033] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. An automatic sampling and detection alarm device for refrigerant water, characterized in that: include: A liquid storage tank (1) is provided with its bottom connected to the evaporator of a refrigeration unit. A first solenoid valve (2) is provided between the liquid storage tank (1) and the evaporator of the refrigeration unit, and a second solenoid valve (3) is provided at the top of the liquid storage tank (1). Pressure sensor (4), the pressure sensor (4) is provided on the liquid storage tank (1); A liquid level controller (5) is disposed on top of the storage tank (1) and its electrode rod is inserted into the storage tank (1); Conductivity controller (6), the conductivity controller (6) is disposed on the top of the storage tank (1) and its detection rod is inserted into the storage tank (1); A vacuum pump (7) is connected to one side of the liquid storage tank (1), and a third solenoid valve (8) is provided between the vacuum pump (7) and the liquid storage tank (1). The PLC controller (9) receives detection signals from the pressure sensor (4), the level controller (5) and the conductivity controller (6), controls the start and stop of the vacuum pump (7), and controls the opening and closing of the first solenoid valve (2), the second solenoid valve (3) and the third solenoid valve (8).

2. The automatic sampling and detection alarm device for refrigerant water according to claim 1, characterized in that: The bottom of the liquid storage tank (1) is provided with a liquid bladder (10), and the liquid bladder (10) of the liquid storage tank (1) is connected to the evaporator of the refrigeration unit.

3. The automatic sampling and detection alarm device for refrigerant water according to claim 1, characterized in that: The liquid storage tank (1) is provided with a liquid level observation window (11) on its tank body.

4. The automatic sampling and detection alarm device for refrigerant water according to claim 1, characterized in that: The liquid level controller (5) includes a high liquid level electrode rod (12) and a low liquid level electrode rod (13).

5. The automatic sampling and detection alarm device for refrigerant water according to claim 1, characterized in that: The detection rod of the conductivity controller (6) is inserted into the middle of the liquid storage tank (1).

6. The automatic sampling and detection alarm device for refrigerant water according to claim 1, characterized in that: A fourth solenoid valve (14) is also provided between the vacuum pump (7) and the liquid storage tank (1), and the fourth solenoid valve (14) is electrically connected to the PLC controller (9).

7. The automatic sampling and detection alarm device for refrigerant water according to claim 1, characterized in that: It also includes an alarm (15) which is electrically connected to the PLC controller (9).

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