Circulating cleaning device for pipeline of liquid cooling unit of air conditioner

Abstract

The invention discloses a circulating cleaning device for a pipeline of a liquid cooling unit of an air conditioner. The circulating cleaning device comprises a deionization part, a deionized water storage tank, a reclaimed water storage tank and a controller, the deionization part is provided with a filtering tank, a softening tank, a primary reverse osmosis device, a secondary reverse osmosis device and an electric deionization device; the filtering tank is provided with a water receiving pipe with a make-up pump; the deionized water storage tank is communicated with the electric deionization device and the reclaimed water storage tank and is provided with a first electric valve; the deionized water storage tank is provided with a first liquid level switch; the reclaimed water storage tank is provided with a water outlet pipe and a water return pipe; the water outlet pipe is provided with a target flow switch, a pump set and a water outlet side detector; the water return pipe is provided with a Y-shaped filter and a water return side detector; valves are arranged on the water outlet pipe and the water return pipe; the reclaimed water storage tank is provided with a second electric valve and a second liquid level switch; the controller is connected with the make-up pump, the first liquid level switch, the first electric valve, the second liquid level switch, the second electric valve, the target flow switch, the pump set, the water outlet side detector and the water return side detector. The water quality requirement of the liquid cooling air conditioning unit can be met.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning cooling water and chilled water pipeline cleaning technology, specifically relating to an air conditioning liquid cooling unit pipeline circulation cleaning device. Background Technology

[0002] The cleanliness of pipes in general water-cooled chiller units must meet the requirements of GB / T 29044 "Water Quality for Heating and Air Conditioning Systems," such as turbidity ≤ 10 NTU, conductivity (25℃) ≤ 2000 μS / cm, and pH (25℃) 7.5–10. Pipe cleaning is required before the unit leaves the factory and before operation to meet the water quality requirements for operation. For liquid-cooled chiller units, the cleanliness requirements are even higher. Before filling with the working fluid, the pipe cleanliness must meet requirements such as turbidity ≤ 10, conductivity ≤ 10, and pH (25℃) 6.5–8, requiring circulating cleaning with deionized water. However, current pipe cleaning technology for water-cooled chiller units does not meet the water quality requirements for liquid-cooled chiller units, necessitating the development of a new water pipe cleaning technology. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a circulating cleaning device for the pipelines of an air conditioning liquid-cooled unit.

[0004] The air conditioning liquid cooling unit pipeline circulation cleaning device of the present invention includes a deionization unit, a deionized water storage tank, a greywater storage tank and a controller; The deionization unit includes a filter tank, a softening tank, a primary reverse osmosis unit, a secondary reverse osmosis unit, and an electro-deionization (EDI) unit connected in sequence by pipelines. The filter tank is equipped with a water inlet pipe for connecting to municipal water, and a water supply pump is installed on the water inlet pipe. The deionized water storage tank is connected to the electro-deionization device and the greywater storage tank via pipelines. A first electric valve is installed on the pipeline between the deionized water storage tank and the greywater storage tank. A first liquid level switch is installed on the deionized water storage tank. The greywater storage tank is connected to an outlet pipe and a return pipe for communication with the liquid cooling unit. On the outlet pipe, a flow switch, pump set, check valve, outlet-side detector, and expansion tank are sequentially installed in the direction away from the greywater storage tank. A Y-type filter and a return-side detector are installed on the return pipe. The ends of both the outlet and return pipes away from the greywater storage tank are connectors for connecting to the liquid cooling unit, and these connectors are equipped with valves. The greywater storage tank is equipped with a drain pipe, a second electric valve, and a second level switch. The controller is connected to the water supply pump, the first level switch, the first electric valve, the second level switch, the second electric valve, the target flow switch, the pump set, the outlet water side detector, and the return water side detector. After receiving the level signal from the first level switch, the controller sends a control signal to the water supply pump to control its start and stop. After receiving the level signal from the second level switch, the controller sends a control signal to the first electric valve to control its start and stop. After receiving the signal from the target flow switch, the controller sends a control signal to the pump set to control its start and stop. After receiving the signals from the outlet water side detector and the return water side detector, the controller sends control signals to the pump set and the second electric valve to control their start and stop.

[0005] Furthermore, a first breather valve is installed on the deionized water storage tank, and a second breather valve is installed on the greywater storage tank. This helps to prevent damage to the storage tanks caused by thermal expansion and contraction.

[0006] Furthermore, both the first and second electric valves are ball valves. This facilitates automatic control operation.

[0007] Furthermore, both the outlet and return water pipes have three parallel sub-connectors: a flange connector, a compression fitting, and a threaded connector. The valves are butterfly valves, with one butterfly valve assigned to each sub-connector. This facilitates the selection of appropriate connectors and connection to the liquid cooling unit.

[0008] Furthermore, the effluent-side monitoring devices include a first conductivity meter, a first pH meter, a first turbidity meter, a first flow meter, and a first pressure sensor; the return-water-side monitoring devices include a second conductivity meter, a second pH meter, a second turbidity meter, a second pressure sensor, and a third pressure sensor; a Y-type filter is located between the second and third pressure sensors. By collecting data from the second conductivity meter, the second pH meter, and the second turbidity meter, the controller controls the start and stop of the pump group; by collecting the pressure difference between the inlet and outlet of the liquid cooler unit (the pressure difference between the first and second pressure sensors), the controller controls the number of pumps operating in the pump group; by collecting the difference between the first and second turbidity meter values, the difference between the second and first pH values, and the difference between the second and first conductivity values, the controller determines and opens or closes the second electric valve for draining the greywater storage tank.

[0009] When any of the values ​​of the second turbidity meter, second pH meter, or second conductivity meter deviates from the values ​​of the first turbidity meter, first pH meter, or first conductivity meter by less than 10% (return water pipe side parameter - outlet water pipe side parameter) / outlet water pipe side parameter is less than 10%, the water in the greywater storage tank needs to be replaced. Stop the pump set, open the second electric valve on the greywater storage tank to drain the water, then open the first electric valve. When the second liquid level switch of the greywater storage tank reaches the high liquid level, close the first electric valve and restart the pump set. Repeat this process until the turbidity, pH value, and conductivity all meet the water quality requirements, then stop the pump set. For example, if the value of the second turbidity meter is detected to be 1.1 times that of the first turbidity meter, or the value of the second pH meter is detected to be 1.1 times that of the first pH meter, or the value of the second conductivity meter is detected to be 1.1 times that of the first conductivity meter, it indicates that the water quality in the greywater storage tank is very poor and cannot clean the liquid cooling unit. The controller needs to control the greywater storage tank to be emptied and deionized water needs to be poured into the deionized water storage tank.

[0010] Furthermore, the pump set includes three water pumps arranged in parallel. This allows for the cleaning of pipelines in liquid-cooled units with different water resistances.

[0011] Furthermore, the controller includes a chip, model GD32F303VET6. This facilitates automatic control.

[0012] Beneficial Effects: The air conditioning liquid-cooled unit pipeline circulation cleaning device of the present invention, after being connected to the liquid-cooled unit, produces deionized water through an electro-deionization device, meeting the requirements of GB / T 11446.1 Electronic Grade Water EW-Ⅳ. The deionized water is stored in a deionized water storage tank, and then enters the liquid-cooled unit through a greywater storage tank and a water pump to clean the liquid-cooled unit. After cleaning, it is discharged from the liquid-cooled unit to the greywater storage tank to complete the circulation. When the index data detected by the return water side detector meets the requirements, the circulation stops. This can meet the water quality requirements of the liquid-cooled air conditioning unit, saving time, labor, and costs. The deionized water produced by the electro-deionization device has good and stable water quality, low operating costs, and a water recovery rate as high as 90%. The concentration ranges from 0% to 95%, requiring no chemical regenerators. During use, the system first flushes with water from the greywater storage tank. If the greywater storage tank's water quality is substandard, deionized water is added from the deionized water storage tank to reduce deionized water consumption. Data is collected by various sensors and signals are sent to the controller, which then controls the start and stop of the pump and electric valves. Breathing valves are installed on both the deionized water and greywater storage tanks to prevent damage from thermal expansion and contraction. The system utilizes the first and second electric valves... All valves are ball valves for easy automatic control. The connection is configured as three parallel sub-connectors of different types, with butterfly valves on each connector, facilitating the selection of suitable connectors and connection to the liquid-cooled unit. The controller uses the collected values ​​from the second turbidity meter, second pH meter, and second conductivity meter to control the pump group's start and stop. The controller also controls the number of pumps operating based on the collected pressure difference between the inlet and outlet of the liquid-cooled unit (the pressure difference between the first and second pressure sensors). The controller uses the collected value from the first turbidity meter to control the start and stop of the second electric valve used for draining the intermediate water storage tank. The configuration of three parallel pumps allows for easy adjustment of the pump number, meeting the requirement of a flushing pipeline flow rate of 1.5–3.0 m / s and the cleaning needs of liquid-cooled unit pipelines with different water resistances. Automatic control is achieved using a controller with chip model GD32F303VET6. This air conditioning liquid-cooled unit pipeline circulation cleaning device can be used for strength testing of water-cooled chillers and liquid-cooled units. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the air conditioning liquid cooling unit pipeline circulation cleaning device of the present invention; In the diagram, 1. Deionization unit; 11. Filter tank; 12. Softening tank; 13. Primary reverse osmosis unit; 14. Secondary reverse osmosis unit; 15. Electro-deionization unit; 16. Make-up water pump; 2. Deionized water storage tank; 21. First level switch; 22. First electric valve; 23. First breather valve; 3. Greywater storage tank; 31. Second level switch; 32. Second electric valve; 33. Second breather valve; 34. Drain pipe; 4. Target flow switch; 5. Pump set; 51. Check valve; 61. First conductivity meter; 62. First pH meter; 63. First turbidity meter; 64. First flow meter; 65. First pressure sensor; 71. Second conductivity meter; 72. Second pH meter; 73. Second turbidity meter; 74. Second pressure sensor; 75. Third pressure sensor; 76. Y-type filter; 81. Butterfly valve; 82. Flange joint; 83. Clamp joint; 84. Threaded joint; 9. Expansion tank; 10. Controller. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, but the present invention is not limited to the embodiments.

[0015] like Figure 1 As shown, the present invention is a circulating cleaning device for the pipeline of an air conditioning liquid cooling unit, including a deionization unit 1, a deionized water storage tank 2, a greywater storage tank 3, and a controller 10.

[0016] The deionization unit 1 includes a filter tank 11, a softening tank 12, a primary reverse osmosis unit 13, a secondary reverse osmosis unit 14, and an electro-deionization unit 15, which are connected in sequence by pipelines. The filter tank 11 is equipped with a water inlet pipe for connecting to municipal water, and a water supply pump 16 is installed on the water inlet pipe.

[0017] The deionized water storage tank 2 is connected to the electro-deionization device 15 and the greywater storage tank 3 via pipelines. A first electric valve 22, specifically a ball valve, is installed on the pipeline between the deionized water storage tank 2 and the greywater storage tank 3. A first liquid level switch 21 is installed on the deionized water storage tank 2.

[0018] The greywater storage tank 3 is connected to an outlet pipe and a return pipe for communication with the liquid cooling unit. On the outlet pipe, a target flow switch 4, a pump set 5, a check valve 51, an outlet-side detector, and an expansion tank 9 are sequentially installed in the direction away from the greywater storage tank 3. A Y-type filter 76 and a return-side detector are installed on the return pipe. The ends of the outlet and return pipes away from the greywater storage tank 3 are connectors for connection to the liquid cooling unit, each equipped with a valve, such as a butterfly valve 81. Specifically, each connector on the outlet and return pipes includes three parallel sub-connectors: a flange connector 82, a clamp connector 83, and a threaded connector 84, each equipped with a butterfly valve 81. The greywater storage tank 3 is equipped with a drain pipe 34, a second electric valve 32, and a second level switch 31. The second electric valve 32, for example, is a ball valve, located on the lower side of the greywater storage tank 3. A first breather valve 23 is provided on the top of the deionized water storage tank 2, and a second breather valve 33 is provided on the top of the greywater storage tank 3.

[0019] The aforementioned pump set 5 consists of three pumps arranged in parallel. The aforementioned outlet-side monitoring instruments are a first conductivity meter 61, a first pH meter 62, a first turbidity meter 63, a first flow meter 64, and a first pressure sensor 65; the return-water-side monitoring instruments are a second conductivity meter 71, a second pH meter 72, a second turbidity meter 73, a second pressure sensor 74, and a third pressure sensor 75; the Y-type filter 76 is located between the second pressure sensor 74 and the third pressure sensor 75.

[0020] The controller 10 is connected to the water supply pump 16, the first level switch 21, the first electric valve 22, the second level switch 31, the second electric valve 32, the target flow switch 4, the pump set 5, the outlet water side detector, and the return water side detector. After receiving the level signal from the first level switch 21, the controller 10 sends a control signal to the water supply pump 16 to control its start and stop. After receiving the level signal from the second level switch 31, the controller 10 sends a control signal to the first electric valve 22 to control its start and stop. After receiving the signal from the target flow switch 4, the controller 10 sends a control signal to the pump set 5 to control its start and stop. After receiving signals from the outlet water side detector and the return water side detector, the controller 10 sends control signals to the pump set 5 and the second electric valve 32 to control their start and stop. The controller 10 has a chip, model GD32F303VET6.

[0021] In actual use, the pipeline circulation cleaning device of this air conditioning liquid cooling unit is divided into two parts: the water production side and the water use side. The water use side has two working modes: strength test water and circulation cleaning.

[0022] Water production side: When the first level switch 21 detects that the deionized water storage tank 2 has reached a low level, the first level switch 21 sends a level signal to the controller 10. After receiving the signal, the controller 10 sends a control signal to the water supply pump 16 to control the water supply pump 16 to run. Water is supplied from municipal water and undergoes filtration, softening, two-stage reverse osmosis, and deionization in the deionization section 1 to produce deionized water that meets the requirements of GB / T 11446.1 Electronic Grade Water EW-Ⅳ. The deionized water is then transported to the deionized water storage tank 2. When the first level switch 21 detects that the deionized water storage tank 2 has reached a high level, the first level switch 21 sends a level signal to the controller 10. After receiving the signal, the controller 10 sends a control signal to the water supply pump 16 to control the water supply pump 16 to stop running.

[0023] Water for strength testing: The outlet and return water pipes on the water side are connected to the liquid chiller unit. The butterfly valve 81 on the return water pipe joint is closed, and a water pump is turned on to pressurize the liquid chiller unit. When the second liquid level switch 31 detects that the greywater storage tank 3 has reached a low liquid level, the second liquid level switch 31 sends a liquid level signal to the controller 10. After receiving the signal, the controller 10 sends a control signal to the first electric valve 22, controlling the first electric valve 22 to open, and the deionized water in the deionized water storage tank 2 flows into the greywater storage tank 3. When the second liquid level switch 31 detects that the greywater storage tank 3 has reached a high liquid level, the second liquid level switch 31 sends a liquid level signal to the controller 10. After receiving the signal, the controller 10 sends a control signal to the first electric valve 22, controlling the first electric valve 22 to close. When the first pressure sensor 65 detects that the water side has reached 1.25 times the design pressure, it sends a pressure signal to the controller 10. After receiving the signal, the controller 10 sends a control signal to the water pump, controlling the water pump to stop running. After the strength test is completed, open the butterfly valve 81 of the water return pipe on the water side to allow the test water to flow back to the greywater storage tank 3. If there is too much water returning, it will be discharged through the drain pipe 34 of the greywater storage tank 3.

[0024] Circulating cleaning water: The outlet and return water pipes on the water side are connected to the liquid chiller unit. The butterfly valve 81 on the return water pipe on the water side is opened, and the pump unit 5 is started. The water in the greywater storage tank 3 returns to the greywater storage tank 3 through the pump unit 5 and the liquid chiller unit. When the greywater storage tank 3 reaches the low liquid level, the controller 10 controls the first electric valve 22 to open, and the deionized water in the deionized water storage tank 2 flows into the greywater storage tank 3. When the greywater storage tank 3 reaches the high liquid level, the controller 10 controls the first electric valve 22 to close. When the turbidity, pH value, and conductivity of the water in the return water pipe all meet the water quality requirements, i.e., the second conductivity meter 71, the second pH meter 72, and the second turbidity meter 73 send signals to the controller 10, and the controller 10, upon receiving the signals from each instrument, sends a control signal to the pump group 5 to stop the pump group 5 from running; when the value of the second turbidity meter is 1.1 times the value of the first turbidity meter, or the value of the second pH meter is 1.1 times the value of the first pH meter, or the value of the second conductivity meter is 1.1 times the value of the first conductivity meter, each instrument sends a signal to the controller 10, and the controller 10 receives the signal. After receiving signals from various instruments, the controller calculates and judges the signals and sends a control signal to pump group 5 to stop pump group 5 from running. At the same time, it sends a control signal to the second electric valve 32 to open the second electric valve 32 to drain or replace the water in the greywater storage tank 3. Then, it controls the second electric valve 32 to close and then controls the first electric valve 22 to open. When the liquid level in the greywater storage tank 3 reaches the high level, the controller 10 controls the first electric valve 22 to close and restart pump group 5. This process is repeated until the turbidity, pH value, and conductivity all meet the water quality requirements, at which point pump group 5 is stopped.

[0025] The circulating water flow rate is controlled between 1.5 and 3.0 m / s. When the first flow meter 64 detects a water flow rate less than 1.5 m / s, it sends a flow signal to the controller 10. After receiving the signal, the controller 10 sends a control signal to the pump group to control the pump group to increase the number of pumps turned on. When the first flow meter 64 detects a water flow rate greater than 3.0 m / s, it sends a flow signal to the controller 10. After receiving the signal, the controller 10 sends a control signal to the pump group to control the pump group to decrease the number of pumps turned on. Each time, one pump is added or removed.

[0026] The number of water pumps can also be adjusted according to the pressure in the outlet pipe. When the pressure in the water pipe is greater than 1.25 times the design pressure, the first pressure sensor 65 and the second pressure sensor 74 send a pressure signal to the controller 10. After receiving the signal, the controller 10 calculates and sends a control signal to the pump group 5 to control the pump group 5 to reduce the number of water pumps turned on.

[0027] When pump set 5 is running, when the intermediate water storage tank 3 reaches a low liquid level, the first electric valve 22 opens to replenish water. If the water replenishment rate is too slow, triggering the target flow switch 4 protection, the target flow switch 4 sends a signal to the controller 10. After receiving the signal, the controller 10 sends a control signal to pump set 5 to stop pump set 5. After the target flow switch protection is released, the target flow switch 4 sends a signal to the controller 10. After receiving the signal, the controller 10 sends a control signal to pump set 5 to resume operation. Each pump outlet has a check valve 51 to protect against pump reversal and water circulation short circuit. An expansion tank 9 is installed in the pipeline to stabilize the water pressure.

[0028] The Y-type filter 76 has a second pressure sensor 74 and a third pressure sensor 75 before and after it. When the pressure after the filter minus the pressure before the filter is greater than the resistance setting value (default 1 bar), it prompts that the Y-type filter 76 needs cleaning. That is, the second pressure sensor 74 and the third pressure sensor 75 send pressure signals to the controller 10. After receiving the signals, the controller 10 calculates and determines the signal and sends a control signal to the relevant device, such as a display, to control the display to show the message "The Y-type filter needs cleaning".

[0029] There are three connection options for the outlet and return water pipes: flange connection, clamp connection, and threaded connection, which facilitates docking with different liquid cooling units.

[0030] A temperature sensor (not shown) can also be connected to the controller 10. When the ambient temperature is below -5℃, the temperature sensor sends a temperature signal to the controller 10. After receiving the signal, the controller 10 sends a control signal to the first electric valve 22 and the second electric valve 32 to control the first electric valve 22 and the second electric valve 32 to open.

[0031] Unless otherwise specified, all technologies mentioned above refer to existing technologies.

[0032] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification.

Claims

1. An air conditioning liquid cooling unit pipeline circulating cleaning device, characterized in that, The device comprises a deionization unit, a deionized water storage tank, a reclaimed water storage tank and a controller. The deionization unit comprises a filter tank, a softening tank, a primary reverse osmosis device, a secondary reverse osmosis device and an electrodeionization device connected in sequence through pipelines, and a water inlet pipe is arranged on the filter tank for connecting municipal water, and a water supplement pump is arranged on the water inlet pipe. The deionized water storage tank is connected with the electrodeionization device and the reclaimed water storage tank through pipelines, and a first electric valve is arranged on the pipeline between the deionized water storage tank and the reclaimed water storage tank. The reclaimed water storage tank is connected with an outlet pipe and a return pipe for connecting with a liquid cooling unit, a target flow switch, a pump group, a check valve, an outlet side detector and an expansion tank are arranged on the outlet pipe in sequence away from the reclaimed water storage tank, a Y-shaped filter and a return side detector are arranged on the return pipe, and the ends of the outlet pipe and the return pipe away from the reclaimed water storage tank are connected with the liquid cooling unit through connectors, and valves are arranged on the connectors. The controller is connected with the water supplement pump, the first liquid level switch, the first electric valve, the second liquid level switch, the second electric valve, the target flow switch, the pump group, the outlet side detector and the return side detector, and sends a control signal to the water supplement pump to control the start and stop of the water supplement pump after receiving a liquid level signal from the first liquid level switch, sends a control signal to the first electric valve to control the start and stop of the first electric valve after receiving a liquid level signal from the second liquid level switch, sends a control signal to the pump group to control the start and stop of the pump group after receiving a signal from the target flow switch, and sends a control signal to the pump group and the second electric valve to control the start and stop after receiving signals from the outlet side detector and the return side detector.

2. The air conditioner liquid cooling unit pipeline circulating cleaning device according to claim 1, characterized in that, A first breathing valve is arranged on the deionized water storage tank, and a second breathing valve is arranged on the reclaimed water storage tank.

3. The air conditioner liquid cooling unit pipeline circulating cleaning device according to claim 1, characterized in that, The first electric valve and the second electric valve are ball valves.

4. The air conditioner liquid cooling unit pipeline circulating cleaning device according to claim 1, characterized in that, The connectors on the outlet pipe and the return pipe each comprise three parallel sub-connectors, namely a flange connector, a clamp connector and a threaded connector, and the valves are butterfly valves, and each sub-connector is provided with a butterfly valve.

5. The air conditioner liquid cooling unit pipeline circulating cleaning device according to claim 1, characterized in that, The outlet side detector comprises a first conductivity detector, a first pH detector, a first turbidity detector, a first flow meter and a first pressure sensor, the return side detector comprises a second conductivity detector, a second pH detector, a second turbidity detector, a second pressure sensor and a third pressure sensor, and the Y-shaped filter is located between the second pressure sensor and the third pressure sensor.

6. The air conditioner liquid cooling unit pipeline circulating cleaning device according to claim 1, characterized in that, The pump group comprises three parallel water pumps.

7. The air conditioner liquid cooling unit pipeline circulating cleaning device according to claim 1, characterized in that, The controller has a chip, and the chip model is GD32F303VET6.

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