Air conditioning unit plate heat exchanger anti-fouling method and anti-fouling control device

Abstract

The application provides a kind of air conditioning unit plate heat exchanger anti-fouling method and anti-fouling control device, belongs to heat exchanger technical field.Heat exchanger is water-cooled heat exchanger, its refrigerant side is connected in refrigeration system and is used as evaporator when air conditioning unit refrigeration operation, its water side can be selectively connected anti-fouling treatment system and main system waterway, water pump is arranged on main system waterway, refrigeration system, main system waterway and anti-fouling treatment system constitute the overall system of air conditioning unit, anti-fouling method includes: judging whether air conditioning unit is in the state of starting operation or in the state of shutdown;When air conditioning unit is in the state of shutdown, whether to carry out anti-fouling treatment is determined according to the running time of heat exchanger above first preset temperature, or, when air conditioning unit is in the state of starting operation, whether heat exchanger carries out anti-fouling treatment is determined according to the running time of plate heat exchanger above second preset temperature and the starting time of air conditioning unit.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, and in particular to a method and device for preventing scaling in plate heat exchangers of air conditioning units. Background Technology

[0002] Heat exchangers are key equipment for the rational utilization and conservation of energy and the development of new energy sources. With the application of new technologies, processes, and materials, plate heat exchangers, with their advantages of small footprint, low investment, and high heat exchange efficiency, are gradually replacing traditional shell-and-tube heat exchangers. However, due to the small flow cross-sectional area of ​​plate heat exchangers, scaling and blockage are common, which is the main reason for the reduced heat exchange efficiency.

[0003] The commonly used descaling method is acidic solution descaling. Acidic solutions mainly play the following roles in the descaling process: 1. Dissolving effect: Acid solutions readily react with calcium, magnesium, and carbonate scale to form easily soluble compounds, dissolving the scale. 2. Stripping effect: Acid solutions can dissolve oxides on metal surfaces, breaking down the bond with scale and causing the scale adhering to the metal oxide surface to peel off. 3. Gas lifting effect: After the acid solution reacts with carbonate scale, a large amount of CO2 is produced. During the escape of CO2 gas, it has a certain lifting force on the scale layer that is difficult to dissolve or dissolves slowly, causing the scale to detach from the heat exchanger surface. 4. Loosening effect: Because the oxides of calcium, magnesium, carbonates, and iron dissolve in the acid solution, the residual scale becomes loose and is easily washed away by the flowing acid solution.

[0004] However, most measures are aimed at the behavior after scaling. If scaling problems can be prevented in advance, not only can the reliable operation of the system be guaranteed, but also the downtime and loss of manpower and material resources during the descaling stage can be saved. Summary of the Invention

[0005] To overcome the problem that plate heat exchangers in related technologies do not prevent scaling in advance, this invention proposes a method and device for preventing scaling in plate heat exchangers of air conditioning units.

[0006] The first aspect of this invention proposes a method for preventing scaling in a plate heat exchanger of an air conditioning unit. The air conditioning unit has a refrigeration system, and the plate heat exchanger is a water-cooled heat exchanger. Its refrigerant side is connected to the refrigeration system and acts as an evaporator during the cooling operation of the air conditioning unit. Its water side can be selectively connected to an anti-scaling treatment system and a main system water circuit. A water pump is installed on the main system water circuit. The refrigeration system, the main system water circuit, and the anti-scaling treatment system constitute the overall system of the air conditioning unit. The method for preventing scaling includes: Determine whether the air conditioning unit is currently running or turned off; When the air conditioning unit is in the off state, the plate heat exchanger is determined to be anti-scaling treatment when the air conditioning unit is off, based on the first time length during which the plate heat exchanger operates above the first preset temperature. When the air conditioning unit is in operation, the plate heat exchanger is used for anti-scaling treatment during the operation of the air conditioning unit, based on the second time length during which the plate heat exchanger operates above the second preset temperature and the continuous operating time of the air conditioning unit.

[0007] In the above technical solution, when the air conditioning unit is in the off state, the determination of whether the plate heat exchanger should undergo anti-scaling treatment while the air conditioning unit is off is based on the first time length during which the plate heat exchanger operates above the first preset temperature, including: Determine whether the plate heat exchanger has been operating above a first preset temperature for a longer period than a preset first time length threshold. If the plate heat exchanger operates above the first preset temperature for a duration less than or equal to the first time length threshold, then the plate heat exchanger will not be subjected to anti-scaling treatment when the air conditioning unit is turned off. If the plate heat exchanger operates above the first preset temperature for a period of time longer than the first time length threshold, then the plate heat exchanger is subjected to anti-scaling treatment while the air conditioning unit is off.

[0008] In the above technical solution, the plate heat exchanger undergoes anti-scaling treatment when the air conditioning unit is off, including: Open the liquid separator valve connected to the plate heat exchanger, close the main system water circuit, and connect the anti-scaling treatment system to the water side of the plate heat exchanger. Start the anti-scaling water pump to deliver the acidic anti-scaling solution into the plate heat exchanger, where the acidic anti-scaling solution dissolves the scale inside the plate heat exchanger. After the anti-scaling water pump has been running for the first preset time, the liquid separator valve is closed to allow the anti-scaling treatment system to exit the water side of the plate heat exchanger. The main system water pump is turned on and off after a second preset running time.

[0009] In the above technical solution, when the air conditioning unit is in operation, based on the second time length during which the plate heat exchanger operates above the second preset temperature and the continuous operating time of the air conditioning unit, it is determined whether the plate heat exchanger is not subjected to anti-scaling treatment during the operation of the air conditioning unit, including: Determine whether the plate heat exchanger operates above the second preset temperature for a duration greater than the preset second time length threshold. If the plate heat exchanger operates above the second preset temperature for a period of time less than or equal to the second time length threshold, then no anti-scaling treatment will be performed on the plate heat exchanger during the start-up and operation of the air conditioning unit.

[0010] In the above technical solution, if the plate heat exchanger operates above the second preset temperature for a longer period than the second time length threshold, then it is determined whether the continuous operation time of the air conditioning unit is greater than the third time length threshold. If the continuous running time of the air conditioning unit does not exceed the third time length threshold, then the anti-scaling treatment should be carried out after the air conditioning unit is turned off. If the continuous operating time of the air conditioning unit exceeds the third time length threshold, then the plate heat exchanger will be treated to prevent scaling during the operation of the air conditioning unit.

[0011] In the above technical solution, anti-scaling treatment is performed on the plate heat exchanger during the start-up and operation of the air conditioning unit, including: Reduce the load on the air conditioning unit; Open the liquid separator valve connected to the plate heat exchanger and close the main system water circuit of the plate heat exchanger; Start the anti-scaling water pump and deliver the acidic anti-scaling solution to the plate heat exchanger through the liquid separator during operation. The acidic anti-scaling solution dissolves the scale inside the plate heat exchanger. After the anti-scaling pump has been running for a preset time, close the liquid separator valve to remove the anti-scaling system from the water side of the plate heat exchanger. The main system water pump is turned on and off after a second preset running time.

[0012] In the above technical solution, the first preset temperature is greater than or equal to 50℃ and less than or equal to 85℃; the second preset temperature is greater than or equal to 50℃ and less than or equal to 85℃; the first time length is 30-60 minutes, preferably around 45 minutes; the second time length is 50-100 minutes, preferably around 75 minutes.

[0013] A second aspect of this invention provides an anti-scaling control device for a plate heat exchanger in an air conditioning unit, comprising: The status acquisition unit is used to determine whether the air conditioning unit is currently in the on-running state or the off state; The descaling control unit is used to determine whether to perform anti-scaling treatment on the plate heat exchanger when the air conditioning unit is off, based on the first time length during which the plate heat exchanger operates above the first preset temperature. When the air conditioning unit is in operation, the plate heat exchanger is subjected to anti-scaling treatment during the operation of the air conditioning unit, based on the second time length during which the plate heat exchanger operates above the second preset temperature and the continuous operating time of the air conditioning unit.

[0014] In the above technical solution, the first descaling control module is used to determine whether to perform anti-scaling treatment on the plate heat exchanger when the air conditioning unit is in the off state, based on the length of time the plate heat exchanger has been running above the first preset temperature. The first descaling control module includes: The first descaling judgment module is used to determine whether the plate heat exchanger has been running above the first preset temperature for a longer period than the preset first time length threshold. The first descaling control submodule is used to prevent the plate heat exchanger from being scaled when the plate heat exchanger operates above the first preset temperature for a period of time less than or equal to the first time length threshold. The second descaling control submodule is used to control the plate heat exchanger to perform anti-scaling treatment when the first time the plate heat exchanger operates above the first preset temperature is greater than the first time length threshold.

[0015] In the above technical solution, anti-scaling treatment is performed on the plate heat exchanger while the air conditioning unit is off, specifically including: Open the liquid separator valve connected to the plate heat exchanger and close the main system water circuit of the plate heat exchanger; after the anti-scaling water pump starts, it will deliver acidic anti-scaling solution to the plate heat exchanger through the liquid separator valve during operation, and the acidic anti-scaling solution will dissolve the scale inside the plate heat exchanger; after the anti-scaling water pump has been running for the first preset time, close the liquid separator valve.

[0016] In the above technical solution, the descaling control unit also includes a second descaling control module; The second descaling control module is used to determine whether to perform anti-scaling treatment on the plate heat exchanger during the start-up operation of the air conditioning unit, based on the second time length during which the plate heat exchanger operates above the second preset temperature and the continuous start-up time of the air conditioning unit. The second descaling control module includes: The second descaling judgment module is used to determine whether the plate heat exchanger has been running above the second preset temperature for a longer period than the preset second time length threshold. The third descaling control submodule is used to prevent scale prevention treatment of the plate heat exchanger during the start-up and operation of the air conditioning unit when the plate heat exchanger operates above the second preset temperature for a period of time less than or equal to the second time length threshold. The fourth descaling control submodule is used to determine whether the continuous running time of the air conditioning unit is greater than the third time length threshold when the plate heat exchanger operates above the second preset temperature for a longer period of time than the second time length threshold. If the continuous running time of the air conditioning unit does not exceed the third time length threshold, then wait for the air conditioning unit to be turned off. If the continuous operating time of the air conditioning unit exceeds the third time length threshold, the plate heat exchanger will be subjected to anti-scaling treatment during the operation of the air conditioning unit.

[0017] In the above technical solution, the plate heat exchanger undergoes anti-scaling treatment during the start-up and operation of the air conditioning unit, including: Reduce the load on the air conditioning unit; Open the liquid separator valve connected to the plate heat exchanger and close the main system water circuit of the plate heat exchanger; After the anti-scaling water pump is started, it delivers acidic anti-scaling solution to the plate heat exchanger through the liquid distribution valve during the operation of the air conditioning unit. The acidic anti-scaling solution dissolves the scale inside the plate heat exchanger. After the anti-scaling water pump has been running for a preset time, close the separator valve to remove the anti-scaling system from the water side of the plate heat exchanger. The main system water pump is turned on and off after a second preset running time.

[0018] In the above technical solution, the first preset temperature is greater than or equal to 50℃ and less than or equal to 85℃; the second preset temperature is greater than or equal to 50℃ and less than or equal to 85℃. The first time duration is 30-60 minutes, preferably around 45 minutes; the second time duration is 50-100 minutes, preferably around 75 minutes.

[0019] A third aspect of the present invention provides an air conditioning unit, which includes a refrigeration system. The refrigeration system includes a plate heat exchanger. The plate heat exchanger is a water-cooled heat exchange system and is used as an evaporator during the refrigeration operation of the refrigeration system. The plate heat exchanger is optionally connected to a water-side user end and an anti-scaling treatment system on its water side. The anti-scaling system is equipped with the above-mentioned plate heat exchanger anti-scaling control device or adopts the above-mentioned plate heat exchanger anti-scaling control method.

[0020] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: This invention provides a method for preventing scaling in plate heat exchangers by coupling temperature and time control. Combined with innovative system design, it aims to prevent scaling during the operation of plate heat exchangers, thereby improving the reliability of the system, reducing operating costs, and solving the scaling problem during plate heat exchanger operation. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0022] Figure 1 This is a control flowchart of the anti-scaling method for the plate heat exchanger of the air conditioning unit according to the present invention; Figure 2 This is a schematic diagram of the anti-scaling device for the plate heat exchanger of the air conditioning unit of the present invention. Detailed Implementation

[0023] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0024] Current plate heat exchangers do not prevent fouling in advance; they only address the problem after fouling has occurred. This invention provides a method for preventing fouling in plate heat exchangers that couples temperature and time control. Combined with an innovative system design, it aims to prevent fouling that occurs during plate heat exchanger operation, thereby improving system reliability, reducing operating costs, and solving the fouling problem during plate heat exchanger operation.

[0025] The following is in conjunction with the appendix Figure 1-2 The technical solution of this embodiment is described in detail. Unless otherwise specified, the following implementation methods and embodiments can be combined with each other.

[0026] Example like Figure 1 As shown, the first aspect of this embodiment proposes a method for preventing scaling in a plate heat exchanger of an air conditioning unit. The air conditioning unit is equipped with a refrigeration system, and the plate heat exchanger is a water-cooled heat exchanger. Its refrigerant is connected to the refrigeration system and acts as an evaporator during the cooling operation of the air conditioning unit. Its water side can optionally be connected to an anti-scaling treatment system and a main system water circuit. The refrigeration system, the main system water circuit, and the anti-scaling treatment system constitute the overall system of the air conditioning unit. The anti-scaling method includes: Determine whether the air conditioning unit is currently running or turned off; When the air conditioning unit is in the off state, the plate heat exchanger is determined to be anti-scaling treatment when the air conditioning unit is off, based on the first time length during which the plate heat exchanger operates above the first preset temperature. When the air conditioning unit is in operation, the plate heat exchanger is used for anti-scaling treatment during the operation of the air conditioning unit, based on the second time length during which the plate heat exchanger operates above the second preset temperature and the continuous operating time of the air conditioning unit.

[0027] In this embodiment of the invention, without changing the original plate heat exchanger structure, the need for anti-scaling treatment of the heat exchanger is determined based on the water-side temperature and operating time inside the heat exchanger during both the air conditioning unit's operation and shutdown states. This reduces the manpower and material costs associated with the descaling stage and improves the reliability of the system during operation.

[0028] Furthermore, when the air conditioning unit is in the off state, the determination of whether the plate heat exchanger should undergo anti-scaling treatment while the air conditioning unit is off is based on the first time length during which the plate heat exchanger operates above the first preset temperature, including: Determine whether the plate heat exchanger has been operating above a first preset temperature for a longer period than a preset first time length threshold. If the plate heat exchanger operates above the first preset temperature for a duration less than or equal to the first time length threshold, then the plate heat exchanger will not be subjected to anti-scaling treatment when the air conditioning unit is turned off. If the plate heat exchanger operates above the first preset temperature for a period of time longer than the first time length threshold, then the plate heat exchanger is subjected to anti-scaling treatment while the air conditioning unit is off.

[0029] In other words, when the air conditioning unit in this embodiment of the invention is in the off state, the determination of whether to perform anti-scaling treatment on the heat exchanger is made by judging the operating time of the heat exchanger above the first preset temperature. Specifically, the longer the operating time, the greater the risk of scaling. Therefore, when the operating time of the heat exchanger above the first preset temperature is greater than the first time length threshold, anti-scaling treatment is performed on it; otherwise, anti-scaling treatment is not performed. Furthermore, the plate heat exchanger undergoes anti-scaling treatment while the air conditioning unit is off, including: Open the liquid separator valve connected to the plate heat exchanger, close the main system water circuit, and connect the anti-scaling treatment system to the water side of the plate heat exchanger. Start the anti-scaling water pump to deliver the acidic anti-scaling solution into the plate heat exchanger, where the acidic anti-scaling solution dissolves the scale inside the plate heat exchanger. After the anti-scaling water pump has been running for the first preset time, the liquid separator valve is closed to allow the anti-scaling treatment system to exit the water side of the plate heat exchanger. The main system water pump is turned on and off after a second preset running time.

[0030] Preferably, the anti-scaling solution is introduced into the anti-scaling water pump for 3 minutes and then the separatory valve is closed.

[0031] In this embodiment of the invention, when preventing scale buildup in the heat exchanger, an acidic anti-scaling solution is introduced to dissolve the scale impurities.

[0032] The above describes the anti-scaling methods for heat exchange units when the air conditioning unit is off. The following describes the anti-scaling methods for heat exchange units when the air conditioning unit is on: like Figure 1 As shown, when the air conditioning unit is in operation, the determination of whether the plate heat exchanger needs anti-scaling treatment during the air conditioning unit's operation is based on the second time length during which the plate heat exchanger operates above the second preset temperature and the continuous operating time of the air conditioning unit. This includes: Determine whether the plate heat exchanger operates above the second preset temperature for a duration greater than the preset second time length threshold. If the plate heat exchanger operates above the second preset temperature for a period of time less than or equal to the second time length threshold, the plate heat exchanger will not be subjected to anti-scaling treatment during the start-up and operation of the air conditioning unit.

[0033] When the air conditioning unit is in operation, if the plate heat exchanger operates above the second preset temperature for a period of time less than or equal to the second time length threshold, it indicates that the risk of scale formation on the heat exchanger is low. Therefore, under this condition, there is no need to perform anti-scale treatment on the heat exchanger.

[0034] Furthermore, such as Figure 1 As shown, if the plate heat exchanger operates above the second preset temperature for a longer period than the second time length threshold, then it is determined whether the continuous operating time of the air conditioning unit is greater than the third time length threshold. If the continuous running time of the air conditioning unit does not exceed the third time length threshold, then the anti-scaling treatment should be carried out after the air conditioning unit is turned off. If the continuous operating time of the air conditioning unit exceeds the third time length threshold, then the plate heat exchanger will be treated to prevent scaling during the operation of the air conditioning unit.

[0035] When the unit is started, it is determined whether the continuous running time of the unit is greater than the third time length threshold. If it is not greater, the anti-scaling treatment is performed after the unit is shut down. If it is greater, the anti-scaling treatment is performed during operation.

[0036] Furthermore, when the unit is running, the specific method for preventing scale buildup is to reduce the load on the air conditioning unit; preferably, the load on the air conditioning unit should be reduced to 70% of its original load. Specifically, the load on the air conditioning unit can be reduced by decreasing the compressor frequency.

[0037] Open the liquid separator valve connected to the plate heat exchanger and close the main system water circuit of the plate heat exchanger; After the anti-scaling water pump is started, it delivers acidic anti-scaling solution to the plate heat exchanger through the liquid separator during operation, and the acidic anti-scaling solution dissolves the scale inside the plate heat exchanger. After the anti-scaling water pump has been running for a preset time, close the liquid distribution valve.

[0038] Specifically, the anti-scaling strategy is completed in 2 minutes, after which the main system water circuit is shut off. During the 2-minute operation of the anti-scaling water pump, acidic anti-scaling solution is introduced and then the distributor valve is closed.

[0039] In any of the above embodiments, the first preset temperature is greater than or equal to 50°C and less than or equal to 85°C; the second preset temperature is greater than or equal to 50°C and less than or equal to 85°C. It is worth noting that when the water-side temperature of the plate heat exchanger is between 50°C and 85°C, the risk of scale formation on the water side is relatively high.

[0040] In any of the above embodiments, the first time duration is 30-60 minutes, preferably around 45 minutes; the second time duration is 50-100 minutes, preferably around 75 minutes.

[0041] A second aspect of the present invention provides an anti-scaling control device for a plate heat exchanger in an air conditioning unit, comprising: The status acquisition unit is used to determine whether the air conditioning unit is currently in the on-running state or the off state; The descaling control unit is used to determine whether the plate heat exchanger should be descaled when the air conditioning unit is turned off, based on the first time length during which the plate heat exchanger operates above the first preset temperature. When the air conditioning unit is in operation, the plate heat exchanger is used for anti-scaling treatment during the operation of the air conditioning unit, based on the second time length during which the plate heat exchanger operates above the second preset temperature and the continuous operating time of the air conditioning unit.

[0042] In this embodiment of the invention, the need for anti-scaling treatment of the heat exchanger is determined based on the water-side temperature and operating time inside the heat exchanger during both the air conditioning unit's operating and shut-down states. This reduces the manpower and material costs associated with the descaling stage and improves the reliability of the system during operation.

[0043] Specifically, the descaling control unit includes: The first descaling control module is used to determine whether the plate heat exchanger should be descaled when the air conditioning unit is off, based on the length of time the plate heat exchanger has been running above the first preset temperature. The first descaling control module includes: The first descaling judgment module is used to determine whether the plate heat exchanger has been running above the first preset temperature for a longer period than the preset first time length threshold. The first descaling control submodule is used to control the plate heat exchanger not to perform anti-scaling treatment when the plate heat exchanger operates above the first preset temperature for a period of time less than or equal to the first time length threshold. The second descaling control submodule is used to control the plate heat exchanger to perform anti-scaling treatment when the first time length during which the plate heat exchanger operates above the first preset temperature is greater than the first time length threshold.

[0044] More specifically, the plate heat exchanger undergoes anti-scaling treatment while the air conditioning unit is off, which includes: Open the liquid separator valve connected to the plate heat exchanger and close the main system water circuit of the plate heat exchanger; after the anti-scaling water pump starts, it will deliver acidic anti-scaling solution to the plate heat exchanger through the liquid separator valve during operation, and the acidic anti-scaling solution will dissolve the scale inside the plate heat exchanger; after the anti-scaling water pump has been running for two minutes, close the liquid separator valve.

[0045] In any of the above embodiments, the descaling control unit further includes a second descaling control module; The second descaling control module is used to determine whether the plate heat exchanger should be descaled during the operation of the air conditioning unit, based on the second time length during which the plate heat exchanger operates above the second preset temperature and the continuous operating time of the air conditioning unit. The second descaling control module includes: The second descaling judgment module is used to determine whether the plate heat exchanger has been running above the second preset temperature for a longer period than the preset second time length threshold. The third descaling control submodule is used to control the plate heat exchanger not to perform anti-scaling treatment during startup if the plate heat exchanger operates above the second preset temperature for a period of time less than or equal to the second time length threshold. The fourth descaling control submodule is used to determine whether the continuous running time of the air conditioning unit is greater than the third time length threshold when the plate heat exchanger operates above the second preset temperature for a longer period of time than the second time length threshold. If the continuous running time of the air conditioning unit does not exceed the third time length threshold, then wait for the air conditioning unit to be turned off. If the continuous operating time of the air conditioning unit exceeds the third time length threshold, the plate heat exchanger will be subjected to anti-scaling treatment during the operation of the air conditioning unit.

[0046] Furthermore, anti-scaling treatment is performed on the plate heat exchanger during the start-up and operation of the air conditioning unit, including: Reduce the load on the air conditioning unit; Open the liquid separator valve connected to the plate heat exchanger and close the main system water circuit of the plate heat exchanger; After the anti-scaling water pump is started, it delivers acidic anti-scaling solution to the plate heat exchanger through the liquid distribution valve during the operation of the air conditioning unit. The acidic anti-scaling solution dissolves the scale inside the plate heat exchanger. After the anti-scaling pump has been running for a preset time, close the liquid separator valve to remove the anti-scaling system from the water side of the plate heat exchanger. The main system water pump is turned on and off after a second preset running time.

[0047] In any of the above embodiments, the first preset temperature is greater than or equal to 50°C and less than or equal to 85°C; the second preset temperature is greater than or equal to 50°C and less than or equal to 85°C; wherein the first time duration is 30-60 minutes, preferably around 45 minutes; and the second time duration is 50-100 minutes, preferably around 75 minutes.

[0048] The third aspect of the present invention also provides a method such as Figure 2 The air conditioning unit shown includes a refrigeration system, which includes a plate heat exchanger. The plate heat exchanger is a water-cooled heat exchange system and is used as an evaporator during the refrigeration operation of the refrigeration system. The plate heat exchanger may optionally be connected to a water-side user end and an anti-scaling treatment system on its water side. The anti-scaling system is equipped with the aforementioned plate heat exchanger anti-scaling control device or adopts the aforementioned plate heat exchanger anti-scaling control method.

[0049] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0050] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A method for preventing scaling in a plate heat exchanger of an air conditioning unit, wherein the air conditioning unit is provided with a refrigeration system, the plate heat exchanger is a water-cooled heat exchanger, its refrigerant side is connected to the refrigeration system and acts as an evaporator during the cooling operation of the air conditioning unit, its water side is optionally connected to an anti-scaling treatment system and a main system water circuit, a water pump is provided on the main system water circuit, and the refrigeration system, the main system water circuit and the anti-scaling treatment system constitute the overall system of the air conditioning unit, characterized in that... The anti-scaling method includes: Determine whether the air conditioning unit is currently running or turned off; When it is determined that the air conditioning unit is in the off state, the plate heat exchanger is determined to be subjected to anti-scaling treatment in the off state based on the first time length of time the plate heat exchanger operates above the first preset temperature. When it is determined that the air conditioning unit is in the start-up operation state, based on the second time length during which the plate heat exchanger operates above the second preset temperature and the continuous start-up time length of the air conditioning unit, it is determined whether the plate heat exchanger is subjected to anti-scaling treatment during the start-up operation of the air conditioning unit.

2. The method for preventing scaling in the plate heat exchanger of an air conditioning unit according to claim 1, characterized in that... , When the air conditioning unit is in the off state, whether to perform anti-scaling treatment on the plate heat exchanger while the air conditioning unit is off is determined based on the first time length during which the plate heat exchanger operates above the first preset temperature, including: Determine whether the plate heat exchanger operates above a first preset temperature for a duration greater than a preset first time length threshold. If the plate heat exchanger operates above the first preset temperature for a duration less than or equal to the first time length threshold, then no anti-scaling treatment will be performed on the plate heat exchanger when the air conditioning unit is turned off. If the plate heat exchanger operates above the first preset temperature for a period of time longer than the first time length threshold, then the plate heat exchanger is subjected to anti-scaling treatment while the air conditioning unit is off.

3. The method for preventing scaling in the plate heat exchanger of an air conditioning unit according to claim 2, characterized in that... , The plate heat exchanger undergoes anti-scaling treatment when the air conditioning unit is off, including: Open the liquid distribution valve connected to the plate heat exchanger, close the main system water circuit, and connect the anti-scaling treatment system to the water side of the plate heat exchanger; Start the anti-scaling water pump to deliver acidic anti-scaling solution into the plate heat exchanger, where the acidic solution dissolves the scale inside the plate heat exchanger. After the anti-scaling water pump has been running for a first preset time, the liquid distribution valve is closed, so that the anti-scaling treatment system is withdrawn from the water side of the plate heat exchanger. The main system water pump is turned on and off after a second preset running time.

4. The method for preventing scaling in the plate heat exchanger of an air conditioning unit according to claim 1, characterized in that... , When the air conditioning unit is in the start-up operating state, based on the second time length during which the plate heat exchanger operates above the second preset temperature and the continuous operating time length of the air conditioning unit, it is determined whether to perform anti-scaling treatment on the plate heat exchanger during the start-up operation of the air conditioning unit, including: Determine whether the plate heat exchanger operates above a second preset temperature for a duration greater than a preset second time length threshold. If the plate heat exchanger operates above the second preset temperature for a period of time less than or equal to the second time length threshold, then no anti-scaling treatment will be performed on the plate heat exchanger during the start-up and operation of the air conditioning unit.

5. The method for preventing scaling in the plate heat exchanger of an air conditioning unit according to claim 4, characterized in that... , If the plate heat exchanger operates above the second preset temperature for a period of time longer than the second time length threshold, then it is determined whether the air conditioning unit operates continuously for a period of time longer than the third time length threshold. If the continuous operating time of the air conditioning unit is not greater than the third time length threshold, then the anti-scaling treatment will be performed after the air conditioning unit is turned off. If the continuous operating time of the air conditioning unit is greater than the third time length threshold, then the plate heat exchanger is subjected to anti-scaling treatment during the operation of the air conditioning unit.

6. The method for preventing scaling in the plate heat exchanger of an air conditioning unit according to claim 5, characterized in that... , The process of performing anti-scaling treatment on the plate heat exchanger during the start-up and operation of the air conditioning unit includes: Reduce the load on the air conditioning unit; Open the liquid distribution valve connected to the plate heat exchanger, and close the main system water circuit of the plate heat exchanger; The anti-scaling water pump is started, and during operation, acidic anti-scaling solution is delivered to the plate heat exchanger through the liquid separator valve, whereby the acidic anti-scaling solution dissolves the scale inside the plate heat exchanger. After the anti-scaling water pump has been running for a preset time, the liquid distribution valve is closed, so that the anti-scaling treatment system is withdrawn from the water side of the plate heat exchanger. The main system water pump is turned on and off after a second preset running time.

7. The method for preventing scaling in the plate heat exchanger of an air conditioning unit according to claim 1, characterized in that... The first preset temperature is greater than or equal to 50℃ and less than or equal to 85℃; the second preset temperature is greater than or equal to 50℃ and less than or equal to 85℃; the first time length threshold is 30-60 minutes, and the second time length threshold is 50-100 minutes.

8. A plate heat exchanger anti-scaling control device for an air conditioning unit, wherein the air conditioning unit is provided with a refrigeration system, the plate heat exchanger is a water-cooled heat exchanger, the refrigerant side of which is connected to the refrigeration system of the air conditioning unit and serves as an evaporator during the cooling operation of the air conditioning unit, and the water side of which can be selectively connected to an anti-scaling treatment system and a main system water circuit, wherein a main system water circuit pump is provided on the main system water circuit. Its features The plate heat exchanger anti-fouling control device includes: The status acquisition unit is used to determine whether the air conditioning unit is currently in an on-running state or an off state; The descaling control unit is used to determine whether to perform anti-scaling treatment on the plate heat exchanger when the air conditioning unit is in the off state, based on the first time length during which the plate heat exchanger operates above the first preset temperature. When the air conditioning unit is in the start-up operation state, the plate heat exchanger is subjected to anti-scaling treatment during the start-up operation of the air conditioning unit, based on the second time length during which the plate heat exchanger operates above the second preset temperature and the continuous start-up time of the air conditioning unit.

9. The anti-fouling control device for plate heat exchangers according to claim 8, characterized in that... , The descaling control unit includes: The first descaling control module is used to determine whether to perform anti-scaling treatment on the plate heat exchanger when the air conditioning unit is in the off state, based on the length of time the plate heat exchanger has been running above a first preset temperature. The first descaling control module includes: The first descaling judgment module is used to determine whether the plate heat exchanger has been operating above a first preset temperature for a longer period of time than a preset first time length threshold. The first descaling control submodule is used to control the plate heat exchanger not to be descaled when the plate heat exchanger operates above the first preset temperature for a period of time less than or equal to the first time length threshold. The second descaling control submodule is used to control the plate heat exchanger to perform anti-scaling treatment when the first time the plate heat exchanger operates above the first preset temperature is greater than the first time length threshold.

10. The anti-fouling control device for plate heat exchangers according to claim 9, characterized in that... The plate heat exchanger undergoes anti-scaling treatment while the air conditioning unit is off, specifically including: Open the liquid separator valve connected to the plate heat exchanger and close the main system water circuit of the plate heat exchanger; after the anti-scaling water pump starts, it delivers acidic anti-scaling solution to the plate heat exchanger through the liquid separator valve during operation, and the acidic anti-scaling solution dissolves the scale inside the plate heat exchanger; after the anti-scaling water pump has been running for a first preset time, close the liquid separator valve.

11. The anti-fouling control device for plate heat exchangers according to claim 8, characterized in that... , The descaling control unit also includes a second descaling control module; The second descaling control module is used to determine whether to perform anti-scaling treatment on the plate heat exchanger during the start-up operation of the air conditioning unit, based on the second time length during which the plate heat exchanger operates above the second preset temperature and the continuous start-up time of the air conditioning unit. The second descaling control module includes: The second descaling judgment module is used to determine whether the plate heat exchanger operates above the second preset temperature for a duration greater than a preset second time length threshold. The third descaling control submodule is used to prevent scale prevention treatment of the plate heat exchanger during the start-up and operation of the air conditioning unit when the plate heat exchanger operates above the second preset temperature for a period of time less than or equal to the second time length threshold. The fourth descaling control submodule is used to determine whether the continuous operating time of the air conditioning unit exceeds a third time threshold when the plate heat exchanger operates above the second preset temperature for a longer period than the second time threshold. If the continuous operating time of the air conditioning unit is not greater than the third time length threshold, then wait for the air conditioning unit to be turned off; If the continuous operating time of the air conditioning unit is greater than the third time length threshold, then the plate heat exchanger is subjected to anti-scaling treatment during the operation of the air conditioning unit.

12. The anti-fouling control device for plate heat exchangers according to claim 11, characterized in that... During the operation of the air conditioning unit, the plate heat exchanger is subjected to anti-scaling treatment, including: Reduce the load on the air conditioning unit; Open the liquid distribution valve connected to the plate heat exchanger, and close the main system water circuit of the plate heat exchanger; After the anti-scaling water pump starts, during the operation of the air conditioning unit, the acidic anti-scaling solution is delivered to the plate heat exchanger through the liquid distribution valve, and the acidic anti-scaling solution dissolves the scale inside the plate heat exchanger; After the anti-scaling water pump has been running for a preset time, the liquid distribution valve is closed, thus removing the anti-scaling treatment system from the water side of the plate heat exchanger. The main system water pump is turned on and off after a second preset running time.

13. The anti-fouling control device for plate heat exchangers according to claim 8, characterized in that... The first preset temperature is greater than or equal to 50℃ and less than or equal to 85℃; the second preset temperature is greater than or equal to 50℃ and less than or equal to 85℃; the first time length threshold is 30-60 minutes, and the second time length threshold is 50-100 minutes.

14. An air conditioning unit comprising a refrigeration system, the refrigeration system including a plate heat exchanger, the plate heat exchanger being a water-cooled heat exchanger and serving as an evaporator during refrigeration operation of the refrigeration system, the plate heat exchanger being optionally connected on its water side to a water-side user end and an anti-scaling treatment system, the anti-scaling treatment system being provided with an anti-scaling control device for the plate heat exchanger as described in any one of claims 8-13 or employing an anti-scaling method for the plate heat exchanger of the air conditioning unit as described in any one of claims 1-7.

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