A sewage discharge control device and method for an evaporative cooling unit

Abstract

The present invention provides a sewage control device and method for an evaporative cooling unit, relating to the field of air conditioning technology. The device includes an electric sewage valve, disposed at the bottom of a water tank, for opening and closing sewage discharge operations; a sensor assembly for measuring the operating conditions and state parameters of the evaporative cooling unit; and a controller, electrically connected to the sensor assembly, for receiving the operating conditions and state parameters and, based on the operating conditions and state parameters, determining the extent to which the spray water in the water tank affects scaling in the heat exchanger, thereby controlling the operation of the electric sewage valve. This method determines the extent to which the spray water in the water tank affects scaling in the heat exchanger based on the operating condition parameters and determines whether sewage should be discharged, thereby avoiding or delaying scaling. This addresses the problem that existing methods fail to consider the impact of the unit's operation under different operating conditions on scaling, leading to severe scaling.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, and in particular to a sewage discharge control device and method for an evaporative cooling unit. Background Art

[0002] Different from conventional chillers, the condensing side of the evaporative cooling unit usually achieves efficient heat exchange by evaporating the refrigerant (usually water). During evaporative heat exchange, as the water evaporates, the water quality is concentrated and the calcium and magnesium ion content increases, which will lead to obvious scaling.

[0003] The occurrence of scaling depends mostly on the condensing temperature and water hardness. Make-up water mostly comes from tap water. The water quality varies in different regions. In addition, the different operating conditions of the unit throughout the year also have a great impact on the formation and impact of scaling.

[0004] At present, the treatment of spray water quality by evaporative cooling units is relatively simple and crude, without considering the impact of the unit's operation under different working conditions on scale formation, which leads to serious scaling problems. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a sewage discharge control device and method for an evaporative cooling unit, which determines the degree of influence of spray water on scaling on the surface of the heat exchanger based on operating condition parameters, thereby determining whether to discharge sewage, thereby avoiding or delaying scaling, and solving the problem that existing methods do not consider the influence of the unit's operation under different operating conditions on scaling formation, thereby leading to serious scaling.

[0006] The present application provides a sewage discharge control device for an evaporative cooling unit, the device comprising:

[0007] The electric sewage valve is set at the bottom of the water tank and is used to open and close the sewage discharge action;

[0008] A sensor assembly for measuring operating conditions and status parameters of the evaporative cooling unit;

[0009] The controller is electrically connected to the sensor assembly and is used to receive the operating conditions and state parameters, and based on the operating conditions and state parameters, determine the degree of influence of the spray water in the water tank on scaling on the surface of the heat exchanger to control the action of the electric drain valve.

[0010] In the above implementation process, the sensor component is used to monitor the operating parameters of the evaporative cooling unit. When the spray water is in an environment prone to scaling for a long time, the hardness of the spray water will increase. At this time, it is necessary to control the electric drain valve to open and discharge the sewage to avoid scaling. This solves the problem that the existing method does not consider the impact of the unit's operation under different working conditions on scale formation, thereby causing serious scaling.

[0011] Furthermore, the sensor assembly includes:

[0012] An exhaust pressure sensor is provided at the inlet end of the heat exchanger and is used to detect the exhaust pressure of the heat exchanger;

[0013] An ambient temperature sensor is connected to the external environment and is used to measure the ambient temperature;

[0014] The conductivity sensor is installed in the water tank and is used to measure the conductivity of the spray water.

[0015] In the above implementation process, multiple parameters such as exhaust pressure, ambient temperature and conductivity are used to reflect the impact of operation under different working conditions on fouling formation in multiple dimensions.

[0016] The present application also provides a method for controlling waste discharge of an evaporative cooling unit, which is applied to a controller. The method includes:

[0017] Receive the operating conditions and status parameters of the evaporative cooling unit sent by the sensor assembly;

[0018] The degree of influence of the spray water in the water tank on the surface of the heat exchanger is judged based on the operating condition parameters and the operating state of the evaporative cooling unit to control the action of the electric drain valve.

[0019] In the above implementation process, the sensor component is used to monitor the operating parameters of the evaporative cooling unit. When the spray water is in an environment prone to scaling for a long time, the hardness of the spray water will increase. At this time, it is necessary to control the electric drain valve to open and discharge the sewage to avoid scaling. This solves the problem that the existing method does not consider the impact of the unit's operation under different working conditions on scale formation, thereby causing scaling.

[0020] Furthermore, the determining of the degree of influence of the spray water in the water tank on scaling on the surface of the heat exchanger based on the operating condition parameters and the operating state of the evaporative cooling unit to control the electric drain valve includes:

[0021] The electrical conductivity, exhaust pressure and ambient temperature are used to determine the degree of influence of the spray water on scaling of the heat exchanger surface, so as to control the electric drain valve.

[0022] In the above implementation process, multiple parameters such as exhaust pressure, ambient temperature and conductivity are used to reflect the impact of operation under different working conditions on fouling formation in multiple dimensions.

[0023] Furthermore, the method of using the conductivity, exhaust pressure and ambient temperature to judge the degree of influence of the spray water on scaling of the heat exchanger surface so as to control the electric drain valve includes:

[0024] When the evaporative cooling unit is in an off state, determining whether the conductivity of the spray water is less than a preset entry conductivity threshold;

[0025] If not, the electric drain valve is opened to drain the sewage.

[0026] In the above implementation process, when the unit is in the off state, if the conductivity is greater than the entry conductivity threshold, it means that the conductivity of the current spray water is too high, and the calcium and magnesium ion content may be high, which is prone to scaling, and the sewage discharge operation can be performed.

[0027] Furthermore, the method of using the conductivity, exhaust pressure and ambient temperature to judge the degree of influence of the spray water on scaling of the heat exchanger surface so as to control the electric drain valve includes:

[0028] When the evaporative cooling unit is in operation, the conductivity and the exhaust pressure are compared with corresponding preset high-pressure control parameters to determine whether to perform sewage discharge.

[0029] In the above implementation process, when the unit is in operation, the monitored conductivity and exhaust pressure can be compared with the preset high-pressure control parameters to determine the hardness of the spray water.

[0030] Furthermore, the comparing the conductivity and the exhaust pressure with corresponding preset high-pressure control parameters to determine whether to perform sewage discharge includes:

[0031] If σ≥σsn, and P≥Pn, and ts≥tn, then perform blowdown;

[0032] Wherein, σ represents conductivity, P represents exhaust pressure, ts represents duration judgment time, σsn, Pn and tn represent a preset first conductivity threshold, an exhaust pressure threshold corresponding to the first conductivity threshold and a corresponding duration threshold, respectively.

[0033] In the above implementation process, when the conductivity and exhaust pressure are greater than the threshold value and the process lasts for a certain period of time, it indicates that the spray water is prone to scaling or is a trigger condition for scaling. At this time, the sewage discharge action can be performed to avoid scaling.

[0034] Furthermore, the method of using the conductivity, exhaust pressure and ambient temperature to judge the degree of influence of the spray water on scaling of the heat exchanger surface so as to control the electric drain valve includes:

[0035] obtaining a corresponding condensation temperature based on the exhaust pressure;

[0036] Calculating an end temperature difference based on the condensing temperature and the ambient temperature;

[0037] The terminal temperature difference and the electrical conductivity are compared with corresponding preset terminal temperature difference control parameters to determine whether to perform blowdown.

[0038] In the above implementation process, the conductivity and the end temperature difference may be used as judgment parameters to determine whether the sewage discharge operation needs to be performed.

[0039] Furthermore, the comparing the terminal temperature difference and the conductivity with corresponding preset terminal temperature difference control parameters to determine whether to perform sewage discharge includes:

[0040] If σ≥σvn, and ΔT≥ΔTn, and tv≥tn, then perform blowdown;

[0041] Wherein, σ represents conductivity, ΔT represents the terminal temperature difference, tv represents the duration judgment time, σvn, ΔTn and tn represent the preset second conductivity threshold, the terminal temperature difference threshold corresponding to the second conductivity threshold, and the corresponding duration threshold, respectively.

[0042] In the above implementation process, if the conductivity and the end temperature difference are both greater than the threshold, and the duration of the process is greater than the time threshold, it means that in this state, the hardness of the spray water will increase and scaling will be easy to form. The sewage discharge operation can be performed to avoid scaling.

[0043] Furthermore, the determining of the degree of influence of the spray water in the water tank on scaling on the surface of the heat exchanger based on the operating condition parameters and the operating state of the unit to control the electric drain valve includes:

[0044] The influence of the spray water on the scaling of the heat exchanger is judged by the spray pump running time, exhaust pressure and terminal temperature difference, so as to control the electric drain valve.

[0045] In the above implementation process, the spray pump operation time can also be used instead of conductivity for judgment. When the spray pump operation time is long, it means that the spray water has flushed the heat exchanger many times, the water quality is concentrated, the calcium and magnesium ion content increases, and scaling is easy to form.

[0046] Furthermore, the method further comprises:

[0047] During the sewage discharge process, if the conductivity reduction hysteresis is greater than the preset sewage discharge exit conductivity hysteresis, or the sewage discharge time is greater than the preset sewage discharge exit duration, the electric sewage valve will be closed. The conductivity reduction hysteresis is the difference between the conductivity and the preset sewage discharge conductivity.

[0048] In the above implementation process, the judgment conditions for exiting the sewage discharge operation are given, which can be judged by the conductivity reduction hysteresis or the continuous sewage discharge time.

[0049] An embodiment of the present application further provides an electronic device, which includes a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the above-mentioned sewage discharge control method of the evaporative cooling unit.

[0050] An embodiment of the present application further provides a readable storage medium, wherein the readable storage medium stores computer program instructions. When the computer program instructions are read and executed by a processor, the above-mentioned sewage discharge control method of the evaporative cooling unit is executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0052] Figure 1 A schematic structural diagram of a sewage discharge control device for an evaporative cooling unit provided in an embodiment of the present application;

[0053] Figure 2 A flow chart of a method for controlling waste discharge of an evaporative cooling unit provided in an embodiment of the present application;

[0054] Figure 3 A flowchart for executing sewage discharge provided in an embodiment of the present application;

[0055] Figure 4 A sewage discharge flow chart of the unit provided in the embodiment of the present application when it is in the closed state;

[0056] Figure 5 This is a flow chart of the end temperature difference control blowdown provided in an embodiment of the present application.

[0057] icon:

[0058] 101-Ambient temperature sensor; 102-Spray pump; 103-Exhaust pressure sensor; 104-Conductivity sensor; 105-Electric drain valve; 106-Water tank. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0060] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0061] Please see Figure 1 , Figure 1A schematic diagram of the structure of a sewage control device for an evaporative cooling unit provided in an embodiment of the present application. Determining the hardness of spray water based solely on water conductivity is a rather one-sided approach, as the varying operating conditions of the unit over the years significantly impact the formation and degree of scaling, affecting the rate of water evaporation and water concentration, and thus the calcium and magnesium ion content in the spray water. Therefore, combining the unit's operating conditions and status parameters allows for a more reasonable assessment of spray water hardness and its impact on scaling.

[0062] The device includes a spray pump 102, an electric sewage valve 105 and a sensor assembly, wherein:

[0063] The electric sewage valve 105 is provided at the bottom of the water tank 106 and is used to open and close the sewage discharge action;

[0064] A sensor assembly for measuring operating conditions and status parameters of the evaporative cooling unit;

[0065] The controller is electrically connected to the sensor assembly, and is used to receive the operating condition and state parameters, and judge the degree of influence of the spray water in the water tank 106 on scaling of the heat exchanger surface based on the operating condition parameters, so as to control the action of the electric drain valve 105.

[0066] Specifically, the evaporative cooling unit is arranged in the water tank 106, and the spray pump 102 draws spray water from the water tank 106 to spray the heat exchanger. The controller monitors the operating conditions and state parameters of the evaporative cooling unit through the sensor component, thereby judging the degree of influence of the spray water on the scaling of the heat exchanger. Specifically, the greater the hardness of the spray water, that is, the higher the content of calcium and magnesium ions, the easier it is to scale. When the hardness of the spray water is in a scaling-prone state, the electric drain valve 105 is opened to discharge the spray water, and the water tank 106 is replenished with water from the water replenishment port, thereby avoiding using spray water with higher hardness to spray the heat exchanger, causing scaling on the surface of the heat exchanger.

[0067] Among them, the sensor components include:

[0068] An exhaust pressure sensor 103 is provided at the inlet end of the heat exchanger and is used to detect the exhaust pressure of the heat exchanger;

[0069] An ambient temperature sensor 101 is connected to the external environment and is used to measure the ambient temperature;

[0070] The conductivity sensor 104 is disposed in the water tank and is used to measure the conductivity of the spray water.

[0071] The ambient temperature sensor 101 may be a dry-bulb temperature sensor or a wet-bulb temperature sensor, which is not limited here.

[0072] The ambient temperature sensor 101 may be disposed on or near the water tank of the evaporative cooling unit, which is not limited here.

[0073] The conductivity sensor 104 is disposed in the water tank, for example, at the inlet end of the spray pump 102 .

[0074] The evaporative cooling unit is equipped with relevant sensors to detect the ambient temperature and condensing pressure of the unit, calculate the condensing temperature, heat exchange temperature difference, etc. Through multiple judgments, it further confirms the impact of the operating conditions on scaling, promptly judges the scaling situation, and responds to sewage discharge.

[0075] The evaporative cooling unit may be further equipped with a conductivity sensor 104 for detecting the hardness and concentration of the spray water, and further determining the current state of the water system and the degree of impact on scaling.

[0076] The operating condition parameters such as exhaust pressure (condensing pressure), ambient temperature, conductivity and spray pump operation time are used as scaling parameters to judge the hardness of the spray water. This method takes into account the impact of the unit operating under different operating conditions, or operating at high condensing temperature under scaling conditions, on scaling formation, thereby reducing scaling. This solves the problem that existing methods do not consider the impact of the unit operating under different operating conditions on scaling formation, which leads to scaling.

[0077] The present application also provides a method for controlling the discharge of pollutants from an evaporative cooling unit, which is applied to the controller in the above embodiment. Figure 2 FIG. 1 is a flow chart of a method for controlling the discharge of pollutants from an evaporative cooling unit, and the method specifically includes the following steps:

[0078] Step S100: receiving the operating conditions and status parameters of the evaporative cooling unit sent by the sensor assembly;

[0079] Step S200 : determining the degree of influence of the spray water in the water tank 106 on scaling of the heat exchanger surface based on the operating condition parameters and the operating state of the evaporative cooling unit, so as to control the electric drain valve 105 .

[0080] Operating parameters include exhaust pressure, conductivity, ambient temperature and spray pump operating time.

[0081] As one embodiment, the exhaust pressure, conductivity and ambient temperature can be used as operating parameters to determine the hardness of the spray water in the water tank 106, such as Figure 3 As shown in the figure, it is a flow chart for executing blowdown. The blowdown process is divided into blowdown during unit operation and blowdown during unit shutdown, so it is necessary to first determine the operating status of the unit. Figure 4 The figure shows the sewage discharge flow chart when the unit is in the shutdown state, which specifically includes the following steps:

[0082] Step S201: When the evaporative cooling unit is in the off state, determining whether the conductivity of the spray water is less than a preset entry conductivity threshold;

[0083] Step S202: If not, open the electric drain valve 105 to drain the waste.

[0084] When the evaporative cooling unit is in the off state, if σ≥σs, σ represents the conductivity of the spray water measured by the conductivity sensor 104, and σs represents the preset entry conductivity threshold, it means that the current conductivity of the spray water is high, which may be because the concentration of calcium and magnesium ions in the spray water is high, which is easy to scale. In this case, the electric drain valve 105 can be opened for drainage.

[0085] When the evaporative cooling unit is in operation, there are two ways to judge the hardness of the spray water. One is high pressure (condensation temperature) judgment:

[0086] When the evaporative cooling unit is in operation, the conductivity and exhaust pressure are compared with corresponding preset high-pressure control parameters to determine whether to perform sewage discharge. Specifically:

[0087] If σ≥σsn, and P≥Pn, and ts≥tn, then perform blowdown;

[0088] Wherein, σ represents conductivity, P represents exhaust pressure, ts represents duration judgment time, σsn, Pn and tn represent a preset first conductivity threshold, an exhaust pressure threshold corresponding to the first conductivity threshold and a corresponding duration threshold, respectively.

[0089] As shown in Table 1, there are a preset first conductivity threshold, an exhaust pressure threshold corresponding to the first conductivity threshold, and a corresponding duration threshold.

[0090] Table 1

[0091] Exhaust pressure P1 P2 P3 P4 …… Pn Conductivity σs1 σs2 σs3 σs4 …… σsn Duration t1 t2 t3 t4 …… tn

[0092] The table above sets parameters that are prone to scaling or trigger conditions that accelerate scaling. For example, when the exhaust pressure is P1 and the conductivity is σs1, and the current state lasts for t1, it indicates that the calcium and magnesium ion content in the spray water is high during this period, making scaling prone. Therefore, the hardness of the spray water can be determined by the operating parameters of the evaporative cooling unit.

[0093] When operating under different operating conditions, such as different exhaust pressures (condensing temperatures) or end temperature differences, the degree of water evaporation will vary when spraying water on the surface of the heat exchanger. The evaporative heat exchange process is accompanied by water evaporation, water concentration, and increased calcium and magnesium ion content, and scaling will become more obvious; and conductivity can reflect the hardness of the spray water. Therefore, the operating condition parameters can be used to judge the hardness of the spray water. This method takes into account the impact of the unit's operation under different operating conditions on scale formation, and can make timely sewage discharge responses through judgment.

[0094] In addition, the table provides the corresponding conductivity thresholds and duration thresholds under different exhaust pressure thresholds, making it easy to find the corresponding thresholds based on the detection values ​​obtained by the sensors. This allows for matching different sewage discharge plans according to the different operating conditions, operating states, and time of the unit, intelligently responding to sewage discharge needs, improving sewage discharge functions, and delaying the risk of heat exchanger scaling.

[0095] Another method is to use the end temperature difference to judge, such as Figure 5 The figure shows a flow chart of end temperature difference control blowdown, which specifically includes the following steps:

[0096] Step S203: obtaining a corresponding condensation temperature based on the exhaust pressure;

[0097] Step S204: Calculating the terminal temperature difference based on the condensing temperature and the ambient temperature;

[0098] Step S205: Compare the terminal temperature difference, the electrical conductivity and the corresponding preset terminal temperature difference control parameter to determine whether to perform blowdown.

[0099] The corresponding condensing temperature tc can be obtained by looking up the table using the exhaust pressure. The measured ambient temperature is T, and the end temperature difference can be expressed as: ΔT = tc - T.

[0100] For step S205, specifically:

[0101] If σ≥σvn, and ΔT≥ΔTn, and tv≥tn, then perform blowdown;

[0102] Wherein, σ represents conductivity, ΔT represents the terminal temperature difference, tv represents the duration judgment time, σvn, ΔTn and tn represent the preset second conductivity threshold, the terminal temperature difference threshold corresponding to the second conductivity threshold, and the corresponding duration threshold, respectively.

[0103] As shown in Table 2, it is a preset second conductivity threshold, an end temperature difference threshold corresponding to the second conductivity threshold, and a corresponding duration threshold.

[0104] Table 2

[0105] End temperature difference ΔT1 ΔT2 ΔT3 ΔT4 …… ΔTn Conductivity σv1 σv2 σv3 σv4 …… σvn Duration t1 t2 t3 t4 …… tn

[0106] The table above sets scaling parameters or trigger conditions for accelerated scaling. For example, when the end temperature difference is ΔT1 and the conductivity is σv1, and the duration of the current state is t1, it means that the calcium and magnesium ion content in the spray water is high at this stage, making scaling prone.

[0107] In addition, the table provides the corresponding conductivity thresholds and duration thresholds under different end temperature difference thresholds, making it easy to find the corresponding thresholds based on the detection values ​​obtained by the sensors. This allows different sewage discharge plans to be matched according to the different operating conditions, operating states, and time of the unit, intelligently responding to sewage discharge needs, improving sewage discharge functions, and avoiding or delaying the risk of scaling on the heat exchanger surface.

[0108] In addition, it should be noted that the above threshold parameters can be set according to the actual model and working conditions, and no limitation is made here.

[0109] As another implementation, the spray pump's operating time can be used in place of conductivity to determine the hardness of the spray water, specifically using the operating time of the spray pump 102, the exhaust pressure, and the terminal temperature difference to determine the hardness of the spray water and control the electric drain valve 105. If the spray pump's operating time is long, it indicates that the spray water in the water tank 106 has repeatedly flushed the heat exchanger surfaces. As the water evaporates, the water concentrates, increasing the calcium and magnesium ion content and making it more susceptible to scaling. Therefore, the spray pump's operating time can be used as one of the criteria for determining the hardness of the spray water. The specific determination process is the same as described above and will not be elaborated here.

[0110] In summary, the hardness of the spray water can be judged by conductivity, exhaust pressure and ambient temperature, or the influence of the spray water on scaling on the heat exchanger surface can be judged by the spray pump operating time, exhaust pressure and end temperature difference. The above parameters can reflect the influence of the operating conditions on scaling, that is, the water hardness and concentration of the spray water. Therefore, through the above judgment, a rapid sewage discharge response can be made to avoid scaling on the heat exchanger surface, which solves the problem that the existing method does not consider the influence of the unit operating under different operating conditions on scaling, thereby leading to serious scaling.

[0111] During the sewage discharge process, if the conductivity reduction hysteresis is greater than the preset sewage discharge exit conductivity hysteresis, or the sewage discharge duration is greater than the preset sewage discharge exit duration, the electric sewage valve 105 is closed. The conductivity reduction hysteresis is the difference between the conductivity and the preset sewage discharge conductivity.

[0112] During the sewage discharge process, if σr>σrs or t>tsp, the sewage discharge is completed.

[0113] Among them, σrs represents the hysteresis of the discharge conductivity, tsp represents the discharge duration, both of which are preset values, and σr=σs-σ, σs represents the preset discharge conductivity.

[0114] Conditions for exiting the blowdown operation are provided, which can be determined by the conductivity drop hysteresis or the duration of the blowdown operation. If the blowdown duration reaches tsp, or the conductivity drop hysteresis exceeds σrs, the wastewater in water tank 106 has been completely drained, and the electric blowdown valve 105 can be closed. By controlling the opening and closing of the electric blowdown valve 105, automatic blowdown is achieved, improving the blowdown function and preventing scaling on the heat exchanger surface.

[0115] An embodiment of the present application further provides an electronic device, which includes a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the above-mentioned sewage discharge control method of the evaporative cooling unit.

[0116] An embodiment of the present application further provides a readable storage medium, wherein the readable storage medium stores computer program instructions. When the computer program instructions are read and executed by a processor, the above-mentioned sewage discharge control method of the evaporative cooling unit is executed.

[0117] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions and operations of the devices, methods and computer program products according to the multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, program segment or a part of the code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or can be implemented using a combination of dedicated hardware and computer instructions.

[0118] In addition, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0119] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0120] The foregoing is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures.

[0121] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

[0122] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

Claims

1. A sewage discharge control device for an evaporative cooling unit, characterized in that: The device comprises: The electric sewage valve is set at the bottom of the water tank and is used to open and close the sewage discharge action; A sensor assembly for measuring operating conditions and status parameters of the evaporative cooling unit; A controller is electrically connected to the sensor assembly, and is used to receive the operating conditions and state parameters, and determine the degree of influence of the spray water in the water tank on scaling on the surface of the heat exchanger based on the operating conditions and state parameters, so as to control the action of the electric drain valve. Specifically, when the evaporative cooling unit is in operation, the conductivity and the exhaust pressure are compared with the corresponding preset high-pressure control parameters to determine whether to perform draining: if σ≥σsn, and P≥Pn, and ts≥tn, draining is performed; wherein σ represents conductivity, P represents exhaust pressure, ts represents continuous judgment time, σsn, Pn and tn represent a preset first conductivity threshold, an exhaust pressure threshold corresponding to the first conductivity threshold, and a corresponding duration threshold, respectively, and the conductivity and exhaust pressure are obtained by the sensor assembly.

2. The sewage discharge control device of the evaporative cooling unit according to claim 1, characterized in that: The sensor assembly comprises: An exhaust pressure sensor is provided at the inlet end of the heat exchanger and is used to detect the exhaust pressure of the heat exchanger; An ambient temperature sensor is connected to the external environment and is used to measure the ambient temperature; The conductivity sensor is installed in the water tank and is used to measure the conductivity of the spray water.

3. A method for controlling wastewater discharge of an evaporative cooling unit, characterized in that: Applied to the controller according to any one of claims 1-2, the method comprises: Receive the operating conditions and status parameters of the evaporative cooling unit sent by the sensor assembly; Based on the operating condition parameters and the operating status of the evaporative cooling unit, the degree of influence of the spray water in the water tank on scaling on the surface of the heat exchanger is determined to control the electric drain valve. Specifically, when the evaporative cooling unit is in operation, the conductivity and the exhaust pressure are compared with the corresponding preset high-pressure control parameters to determine whether to perform draining: if σ≥σsn, and P≥Pn, and ts≥tn, draining is performed; wherein σ represents conductivity, P represents exhaust pressure, ts represents continuous judgment time, and σsn, Pn, and tn respectively represent a preset first conductivity threshold, an exhaust pressure threshold corresponding to the first conductivity threshold, and a corresponding duration threshold.

4. The method for controlling waste discharge of an evaporative cooling unit according to claim 3, characterized in that: The method of judging the influence of the spray water in the water tank on the scaling of the heat exchanger surface based on the operating condition parameters and the operating state of the evaporative cooling unit to control the electric drain valve includes: The electrical conductivity, exhaust pressure and ambient temperature are used to determine the degree of influence of the spray water on scaling of the heat exchanger, so as to control the electric drain valve.

5. The sewage discharge control method of the evaporative cooling unit according to claim 4, characterized in that: The method of using the conductivity, exhaust pressure and ambient temperature to judge the influence of the spray water on scaling of the heat exchanger surface so as to control the electric drain valve includes: When the evaporative cooling unit is in an off state, determining whether the conductivity of the spray water is less than a preset entry conductivity threshold; If not, the electric drain valve is opened to drain the sewage.

6. The method for controlling waste discharge of an evaporative cooling unit according to claim 4, characterized in that: The method of using the conductivity, exhaust pressure and ambient temperature to judge the influence of the spray water on scaling of the heat exchanger surface so as to control the electric drain valve includes: obtaining a corresponding condensation temperature based on the exhaust pressure; Calculating an end temperature difference based on the condensing temperature and the ambient temperature; The terminal temperature difference and the electrical conductivity are compared with corresponding preset terminal temperature difference control parameters to determine whether to perform blowdown.

7. The method for controlling waste discharge of an evaporative cooling unit according to claim 6, characterized in that: The comparing the terminal temperature difference and the electrical conductivity with corresponding preset terminal temperature difference control parameters to determine whether to perform sewage discharge includes: If σ≥σvn, and ΔT≥ΔTn, and tv≥tn, then perform blowdown; Wherein, σ represents conductivity, ΔT represents the terminal temperature difference, tv represents the duration judgment time, σvn, ΔTn and tn represent the preset second conductivity threshold, the terminal temperature difference threshold corresponding to the second conductivity threshold, and the corresponding duration threshold, respectively.

8. The method for controlling waste discharge of an evaporative cooling unit according to claim 3, characterized in that: The method of judging the hardness of the spray water in the water tank and the degree of influence on scaling on the surface of the heat exchanger based on the operating condition parameters and the operating state of the unit to control the electric drain valve includes: The hardness of the spray water and the degree of its impact on scaling on the heat exchanger surface are determined by the spray pump running time, exhaust pressure and end temperature difference, so as to control the electric drain valve.

9. The method for controlling waste discharge of an evaporative cooling unit according to claim 3, characterized in that: The method further comprises: During the sewage discharge process, if the conductivity reduction hysteresis is greater than the preset sewage discharge exit conductivity hysteresis, or the sewage discharge time is greater than the preset sewage discharge exit duration, the electric sewage valve will be closed. The conductivity reduction hysteresis is the difference between the conductivity and the preset sewage discharge conductivity.

10. An electronic device, characterized in that: The electronic device includes a memory and a processor, the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to perform the pollution discharge control method of the evaporative cooling unit according to any one of claims 3 to 9.

11. A readable storage medium, characterized in that: The readable storage medium stores computer program instructions, and when the computer program instructions are read and executed by a processor, the method for controlling the discharge of pollutants from the evaporative cooling unit according to any one of claims 3 to 9 is executed.

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