Scale removal method and evaporative cooling heat exchanger assembly

Abstract

The present invention provides a descaling method and an evaporative cooling heat exchanger assembly, which relate to the technical field of refrigeration. The descaling method includes receiving a first evaporation pressure value and a second evaporation pressure value. The first evaporation pressure value represents the average evaporation pressure of the refrigerant in the heat exchanger in a first preset period, and the second evaporation pressure value represents the average evaporation pressure of the refrigerant in the heat exchanger in a second preset period. The first preset period and the second preset period are adjacent and the second preset period is before the first preset period. Control the spray device to switch the spray gear according to the first evaporation pressure value and the second evaporation pressure value, so as to adjust the spray amount of the spray device. The present invention also provides an evaporative cooling heat exchanger assembly, which can execute the above descaling method. The descaling method and the evaporative cooling heat exchanger assembly provided by the present invention can quickly descale the heat exchanger.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration, and more particularly to a descaling method and an evaporative cooling heat exchanger assembly. Background Art

[0002] At present, after an evaporative cooling plate-tube heat exchanger unit operates for a period of time, scaling will occur. The evaporative cooling plate-tube heat exchanger mainly dissipates heat by water spraying and evaporation on it. The cooling water used for spraying itself contains a large amount of calcium, magnesium, and chloride ions, which increases the concentration multiple of the water, resulting in the precipitation of high-concentration salts on the surface to form dirt, thereby reducing the heat transfer efficiency of the evaporative cooling plate-tube heat exchanger.

[0003] In addition to anti-scaling measures, there are also descaling measures. Descaling mainly includes chemical agents and manual mechanical cleaning. Chemical agents have a certain corrosive effect on the evaporative cooling plate-tube heat exchanger and cannot be used frequently. Manual cleaning has a high maintenance cost. Summary of the Invention

[0004] Another object of the present invention is to provide a descaling method that can efficiently and quickly complete the descaling of the heat exchanger of the evaporative cooling unit.

[0005] One object of the present invention is to provide, for example, an evaporative cooling heat exchanger assembly that can efficiently and quickly achieve the purpose of descaling the heat exchanger of the evaporative cooling unit.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] The embodiments of the present invention provide a descaling method applied to an evaporative cooling heat exchanger assembly. The evaporative cooling heat exchanger assembly includes an evaporative cooling unit, and the evaporative cooling unit includes a spraying device and a heat exchanger. The spraying device is used to spray water towards the heat exchanger, and the heat exchanger is used to receive refrigerant and output cold or heat.

[0008] The method includes:

[0009] Receiving a first evaporation pressure value and a second evaporation pressure value. The first evaporation pressure value represents the average evaporation pressure of the refrigerant in the heat exchanger in a first preset period, and the second evaporation pressure value represents the average evaporation pressure of the refrigerant in the heat exchanger in a second preset period. The first preset period and the second preset period are adjacent and the second preset period is before the first preset period.

[0010] Controlling the spraying device to switch the spraying gear according to the first evaporation pressure value and the second evaporation pressure value to adjust the spraying amount of the spraying device.

[0011] The descaling method provided by the present invention is applied to the above-mentioned evaporation-cooled heat exchanger assembly, and the beneficial effects of this descaling method compared with the prior art include: This descaling method can control the spray device to switch the spray gear by detecting the evaporation pressure of the refrigerant in the heat exchanger, so as to adjust the spray amount of the spray device, enabling an ice layer to be quickly formed on the heat exchanger, thereby quickly and efficiently achieving the purpose of descaling the heat exchanger.

[0012] Optionally, the step of controlling the spray device to switch the spray gear according to the first evaporation pressure value and the second evaporation pressure value includes:

[0013] Calculate the difference between the first evaporation pressure value and the second evaporation pressure value to obtain an evaporation pressure difference.

[0014] Control the spray device to switch the spray gear according to the evaporation pressure difference.

[0015] Optionally, the step of controlling the spray device to switch the spray gear according to the evaporation pressure difference includes:

[0016] When the evaporation pressure difference is less than a first preset value, control the spray device to switch to the stop gear to stop the spray device.

[0017] When the evaporation pressure difference is greater than or equal to the first preset value and less than a second preset value, control the spray device to switch to the first gear.

[0018] When the evaporation pressure difference is greater than or equal to the second preset value and less than a third preset value, control the spray device to switch to the second gear.

[0019] When the evaporation pressure difference is greater than or equal to the third preset value and less than a fourth preset value, control the spray device to switch to the third gear.

[0020] When the evaporation pressure difference is greater than or equal to the fourth preset value, control the spray device to switch to the fourth gear.

[0021] The spray amounts corresponding to the first gear, the second gear, the third gear, and the fourth gear increase in sequence.

[0022] Optionally, the time length of the first preset period is equal to the time length of the second preset period.

[0023] An evaporation-cooled heat exchanger assembly includes an evaporation-cooled unit, a descaling system, an evaporation pressure detection device, and a controller.

[0024] The descaling system includes a compressor, a four-way valve, an evaporator, a guiding channel, and a throttling channel.

[0025] The refrigerant outlet end and the refrigerant inlet end of the compressor are respectively connected to the four-way valve.

[0026] The evaporative cooling unit has a heat exchanger for cooling water, and one end of the heat exchanger is connected to the four-way valve.

[0027] The evaporator is used to output cooling capacity or heat, and one end is connected to the four-way valve.

[0028] The guiding channel has a first interface, a second interface and two third interfaces. The first interface is connected to the other end of the heat exchanger, and the second interface is connected to the other end of the evaporator.

[0029] The throttling channel is used to throttle and depressurize the refrigerant, and has a liquid inlet end and a liquid outlet end. The liquid inlet end and the liquid outlet end are respectively connected to the two third interfaces.

[0030] When the refrigerant is introduced at the first interface or the second interface of the guiding channel, the guiding channel exports the refrigerant from the third interface connected to the liquid inlet end.

[0031] The evaporation pressure detection device is arranged inside the heat exchanger, and is used to detect the evaporation pressure of the refrigerant inside the heat exchanger and issue the first evaporation pressure value or the second evaporation pressure value.

[0032] The controller is electrically connected to the evaporation pressure detection device and is used to receive the first evaporation pressure value and the second evaporation pressure value. The spraying device is electrically connected to the controller, and the controller can execute the descaling method;

[0033] The descaling method includes:

[0034] Receiving the first evaporation pressure value and the second evaporation pressure value. The first evaporation pressure value represents the average evaporation pressure of the refrigerant in the heat exchanger in the first preset period, and the second evaporation pressure value represents the average evaporation pressure of the refrigerant in the heat exchanger in the second preset period. The first preset period and the second preset period are adjacent and the second preset period is before the first preset period.

[0035] Controlling the spraying device to switch the spraying gear according to the first evaporation pressure value and the second evaporation pressure value to adjust the spraying amount of the spraying device.

[0036] The beneficial effects of the evaporative cooling heat exchanger assembly provided by the present invention compared with the prior art include: The evaporative cooling heat exchanger assembly can supply low-temperature refrigerant to the heat exchanger of the evaporative cooling unit through a compressor. When the spraying device of the evaporative cooling heat exchanger sprays water on the heat exchanger, ice layers can form on the surface of the heat exchanger, so that the dirt on the surface of the heat exchanger can be frozen into one body. In addition, when the ice layer on the heat exchanger reaches a certain degree, high-temperature refrigerant can be supplied to the heat exchanger through the compressor, so that the part of the ice layer attached to the heat exchanger melts, so as to achieve the purpose of the ice layer detaching from the heat exchanger. When the ice layer detaches from the heat exchanger, the dirt frozen into one body by the ice layer is also detached from the heat exchanger, so as to achieve the purpose of removing dirt from the heat exchanger. By quickly switching through the four-way valve to realize the mutual switching between icing and ice melting on the heat exchanger, the purpose of efficiently and quickly removing dirt from the heat exchanger of the evaporative cooling unit can be achieved.

[0037] Optionally, the guiding channel includes a first one-way channel, a second one-way channel, a third one-way channel, and a fourth one-way channel.

[0038] One end of the first one-way channel is connected to one end of the second one-way channel to form the first interface, and the first one-way channel conducts fluid in one direction towards the first interface.

[0039] The other end of the first one-way channel is connected to one end of the fourth one-way channel to form the third interface and is connected to the liquid outlet end.

[0040] One end of the third one-way channel is connected to the other end of the fourth one-way channel to form the second interface, and the fourth one-way channel conducts fluid in one direction towards the second interface.

[0041] The other end of the third one-way channel is connected to the other end of the second one-way channel to form the third interface and is connected to the liquid inlet end. Both the third one-way channel and the second one-way channel conduct fluid in one direction towards the liquid inlet end and are both unidirectional.

[0042] Optionally, an expansion valve and a drying filter are provided on the throttling channel. The drying filter is arranged close to the liquid inlet end, and the expansion valve is arranged close to the liquid outlet end.

[0043] Optionally, a liquid receiver is further provided on the throttling channel. The liquid receiver is arranged between the drying filter and the liquid inlet end, so that when the refrigerant enters the throttling channel from the liquid inlet end, it can flow through the liquid receiver, the drying filter, and the expansion valve in sequence.

[0044] Optionally, the evaporative cooling unit includes a water pump, and a blower, a spraying device, the heat exchanger, and a water storage device arranged from top to bottom.

[0045] The water pump is connected to the water storage device and the spraying device. The water pump is used to pump the water in the water storage device to the spraying device and provide the power for spraying water.

[0046] Optionally, the evaporative cooling unit further includes a water replenishing channel and a sewage draining channel. The water replenishing channel is connected to the water storage device and is used to replenish water to the water storage device. The sewage draining channel is connected to the bottom of the water storage device and is used for sewage draining of the water storage device. Description of the Drawings

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0048] Figure 1 It is a schematic structural diagram of an evaporative cooling heat exchanger assembly provided in an embodiment of the present application;

[0049] Figure 2 It is a schematic structural diagram of an evaporative cooling unit provided in an embodiment of the present application;

[0050] Figure 3 It is a flowchart of a descaling method provided in an embodiment of the present application;

[0051] Figure 4 It is a specific flowchart of step S2 in the descaling method provided in an embodiment of the present application;

[0052] Figure 5 It is a specific flowchart of step S22 in the descaling method provided in an embodiment of the present application.

[0053] Icons: 10 - Evaporative cooling heat exchanger assembly; 100 - Evaporative cooling unit; 110 - Heat exchanger; 120 - Fan; 130 - Spraying device; 140 - Water storage device; 141 - Water replenishing channel; 142 - Sewage draining channel; 143 - Conductivity tester; 150 - Water pump; 200 - Descaling system; 210 - Compressor; 211 - Refrigerant outlet end; 212 - Refrigerant inlet end; 220 - Evaporator; 230 - Guide channel; 231 - First interface; 232 - Second interface; 233 - Third interface; 234 - First one-way channel; 235 - Second one-way channel; 236 - Third one-way channel; 237 - Fourth one-way channel; 240 - Throttle channel; 241 - Liquid inlet end; 242 - Liquid outlet end; 243 - Expansion valve; 244 - Dry filter; 245 - Receiver; 250 - Gas-liquid separator; 260 - Four-way valve. Detailed implementation manners

[0054] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention generally described and illustrated in the accompanying drawings here can be arranged and designed in a variety of different configurations.

[0055] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0056] It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0057] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0058] In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0059] It should be noted that the features in the embodiments of the present invention can be combined with each other without conflict.

[0060] Please refer to Figure 1, in the embodiments of the present application, an evaporative cooling heat exchanger assembly 10 is provided. The evaporative cooling heat exchanger assembly 10 can be used to provide cooling capacity to users, thereby meeting the cooling needs of users. Among them, the evaporative cooling heat exchanger assembly 10 includes an evaporative cooling unit 100 and a descaling system 200. The evaporative cooling unit 100 has a heat exchanger 110 for cooling water, and water can flow through the surface of the heat exchanger 110. The heat exchanger 110 outputs cooling capacity to the water to achieve the purpose of cooling water. After the evaporative cooling unit 100 operates for a long time, scale will form on the heat exchanger 110. This scale will affect the heat transfer efficiency of the heat exchanger 110, thereby reducing the output cooling capacity of the heat exchanger 110, further affecting the energy efficiency of the evaporative cooling unit 100 and the energy efficiency of the evaporative cooling heat exchanger assembly 10. In order to remove the scale on the heat exchanger 110, the descaling system 200 is connected to the heat exchanger 110, and the descaling system 200 can achieve the purpose of efficiently and quickly removing scale from the heat exchanger 110.

[0061] Please refer to Figure 1 and Figure 2 , the descaling system 200 includes a compressor 210, a four-way valve 260, an evaporator 220, a guiding channel 230, and a throttling channel 240. The compressor 210 is used to compress the refrigerant, so that the normal gaseous refrigerant can be compressed to form a high-temperature and high-pressure refrigerant. And, the compressor 210 has a refrigerant outlet end 211 and a refrigerant inlet end 212. The compressor 210 can export the high-temperature refrigerant from the refrigerant outlet end 211, so as to realize the refrigerant entering the circulation loop; the compressor 210 can suck the refrigerant from the refrigerant inlet end 212 to supplement the refrigerant into the compressor 210. Among them, the refrigerant outlet end 211 and the refrigerant inlet end 212 of the compressor 210 are respectively connected to the four-way valve 260, that is, the refrigerant outlet end 211 and the refrigerant inlet end 212 are respectively connected to two inlets of the four-way valve 260 through ducts. The heat exchanger 110 in the evaporative cooling unit 100 is connected to one inlet of the four-way valve 260. The evaporator 220 is used to output cold or heat, and one end of the evaporator 220 is connected to the four-way valve 260, that is, one interface end of the evaporator 220 is connected to one inlet of the four-way valve 260 through a duct. The four-way valve 260 has two valve positions. When the four-way valve 260 is in one valve position, the four-way valve 260 conducts the refrigerant outlet end 211 and the heat exchanger 110 and conducts the refrigerant inlet end 212 and the evaporator 220, so that the high-temperature refrigerant exported by the compressor 210 can enter the heat exchanger 110; when the four-way valve 260 is in the other valve position, the four-way valve 260 conducts the refrigerant outlet end 211 and the evaporator 220 and conducts the refrigerant inlet end 212 and the evaporator 220, so that the high-temperature refrigerant exported by the compressor 210 can enter the evaporator 220.

[0062] The guiding channel 230 has a first interface 231, a second interface 232 and two third interfaces 233. The first interface 231 is connected to the other end of the heat exchanger 110, and the second interface 232 is connected to the other end of the evaporator 220, so that the guiding channel 230 can introduce refrigerant from either the first interface 231 or the second interface 232. In addition, the throttling channel 240 is used to throttle and depressurize the refrigerant, and the throttling channel 240 has a liquid inlet end 241 and a liquid outlet end 242. The liquid inlet end 241 and the liquid outlet end 242 are respectively connected to the two third interfaces 233. It should be noted that in the embodiment of the present application, the guiding channel 230 can introduce refrigerant from either the first interface 231 or the second interface 232, and can export the refrigerant from the third interface 233 connected to the liquid inlet end 241. When the refrigerant flows in the throttling channel 240 and flows out from the liquid outlet end 242, it can be introduced into the guiding channel 230 from the third interface 233 connected to the liquid outlet end 242, and the refrigerant is exported from the second interface 232 or the first interface 231 to form a circulation loop in the entire descaling system 200.

[0063] As described above, the descaling system 200 may have the following states: First, the four-way valve 260 conducts the refrigerant outlet end 211 and the evaporator 220 and conducts the refrigerant inlet end 212 and the heat exchanger 110. At this time, the compressor 210 guides the high-temperature refrigerant formed after compression to the evaporator 220. The refrigerant cooled by the evaporator 220 enters the guiding channel 230 through the second interface 232. Then, the guiding channel 230 guides the refrigerant into the throttling channel 240 for throttling and pressure reduction, so that the refrigerant forms a low-temperature refrigerant. The low-temperature refrigerant is introduced into the guiding channel 230 from the third interface 233 connected to the liquid outlet end 242 and is guided to the heat exchanger 110 through the first interface 231. After the low-temperature refrigerant enters the heat exchanger 110, it can freeze the water on the outer surface of the heat exchanger 110, so that an ice layer is formed on the outer surface of the heat exchanger 110. It should be noted that this ice layer can freeze the scale on the surface of the heat exchanger 110 into one body. After that, the refrigerant is exported from the heat exchanger 110 and is guided back to the compressor 210 through the refrigerant inlet end 212, thus forming a refrigerant circulation loop. Second, the four-way valve 260 conducts the refrigerant outlet end 211 and the heat exchanger 110 and conducts the refrigerant inlet end 212 and the evaporator 220. At this time, the compressor 210 guides the high-temperature refrigerant formed after compression to the heat exchanger 110. The high-temperature refrigerant entering the heat exchanger 110 provides heat to the ice layer outside the heat exchanger 110 to melt and fall off the ice layer outside the heat exchanger 110. When the ice layer melts and falls off, the scale frozen together can be removed at the same time, so as to achieve the purpose of cleaning the scale on the heat exchanger 110. The refrigerant flowing through the heat exchanger 110 is exported from the heat exchanger 110 and is introduced into the guiding channel 230 through the first interface 231. The guiding channel 230 guides the refrigerant from the liquid inlet end 241 into the throttling channel 240, and makes the refrigerant enter the guiding channel 230 from the third interface 233 connected to the liquid outlet end 242. Then, the refrigerant is introduced into the evaporator 220 from the second interface 232, and after the refrigerant is exported from the evaporator 220, it is introduced into the compressor 210 through the refrigerant inlet end 212 to form a refrigerant circulation loop.

[0064] In summary, in the embodiments of the present application, the compressor 210 can provide low-temperature refrigerant to the heat exchanger 110 of the evaporative cooling unit 100, and when the spraying device 130 of the evaporative cooling heat exchanger 110 sprays water onto the heat exchanger 110, ice layers can form on the surface of the heat exchanger 110, so that the dirt on the surface of the heat exchanger 110 can be frozen into one body. In addition, when the ice layers on the heat exchanger 110 reach a certain degree, the compressor 210 can provide high-temperature refrigerant to the heat exchanger 110, so that the part of the ice layer that adheres to the heat exchanger 110 melts, so as to achieve the purpose of the ice layer detaching from the heat exchanger 110. When the ice layer detaches from the heat exchanger 110, the ice layer also detaches the dirt frozen into one body from the heat exchanger 110, so as to achieve the purpose of removing dirt from the heat exchanger 110. By quickly switching through the four-way valve 260 to realize the mutual switching between ice formation and ice melting on the heat exchanger 110, the purpose of efficiently and quickly removing dirt from the heat exchanger 110 of the evaporative cooling unit 100 can be achieved.

[0065] Furthermore, in the embodiments of the present application, the guiding channel 230 includes a first one-way channel 234, a second one-way channel 235, a third one-way channel 236, and a fourth one-way channel 237. Among them, the first one-way channel 234, the second one-way channel 235, the third one-way channel 236, and the fourth one-way channel 237 are all channels with one-way conduction. Optionally, in an embodiment of the present application, corresponding one-way valves are respectively provided in the first one-way channel 234, the second one-way channel 235, the third one-way channel 236, and the fourth one-way channel 237 to achieve the one-way conduction of the first one-way channel 234, the second one-way channel 235, the third one-way channel 236, and the fourth one-way channel 237. Of course, in other embodiments, other methods may also be used to achieve the one-way conduction of the first one-way channel 234, the second one-way channel 235, the third one-way channel 236, and the fourth one-way channel 237. To achieve the function of the guiding channel 230, in the embodiments of the present application, one end of the first one-way channel 234 is connected to one end of the second one-way channel 235 to form a first interface 231, and the first one-way channel 234 conducts fluid flow towards the first interface 231 and has one-way conduction. The other end of the first one-way channel 234 is connected to one end of the fourth one-way channel 237 to form a third interface 233, and this third interface 233 is connected to the liquid outlet end 242; in other words, one end of the first one-way channel 234 and one end of the fourth one-way channel 237 are both connected to the liquid outlet end 242 of the throttling channel 240. One end of the third one-way channel 236 is connected to the other end of the fourth one-way channel 237 to form a second interface 232, and the fourth one-way channel 237 conducts fluid flow towards the second interface 232 and has one-way conduction; in other words, one end of the third one-way channel 236 and the other end of the fourth one-way channel 237 are connected to one end of the evaporator 220 away from the four-way valve 260. The other end of the third one-way channel 236 is connected to the other end of the second one-way channel 235 to form another third interface 233, and is connected to the liquid inlet end 241; in other words, the other end of the third one-way channel 236 and the other end of the second one-way channel 235 are connected to the liquid inlet end 241 of the throttling channel 240. In addition, both the second one-way channel 235 and the third one-way channel 236 conduct fluid flow towards the liquid inlet end 241 in a one-way manner, that is, when the refrigerant is discharged from the second one-way channel 235 or the third one-way channel 236, the refrigerant directly enters the throttling channel 240 through the liquid inlet end 241.

[0066] In addition, in the embodiments of the present application, an expansion valve 243 and a dryer filter 244 are provided on the throttling channel 240. The dryer filter 244 is arranged close to the liquid inlet end 241, and the expansion valve 243 is arranged close to the liquid outlet end 242. When the refrigerant is introduced into the throttling channel 240 from the liquid inlet end 241, the refrigerant can flow through the dryer filter 244 and the expansion valve 243 in sequence, so that the refrigerant will definitely pass through the dryer filter 244 for drying and filtering before entering the expansion valve 243. After throttling and depressurizing by the expansion valve 243, the refrigerant is led out from the liquid outlet end 242. Optionally, a liquid accumulator 245 may also be provided on the throttling channel 240. The liquid accumulator 245 is arranged between the dryer filter 244 and the liquid inlet end 241, so that after the refrigerant is introduced into the throttling channel 240 from the liquid inlet end 241, it can flow through the liquid accumulator 245, the dryer filter 244 and the expansion valve 243 in sequence, and then be led out from the liquid outlet end 242.

[0067] Furthermore, in the embodiments of the present application, the evaporative cooling unit 100 includes a water pump 150, and a blower 120, a spraying device 130, a heat exchanger 110 and a water storage device 140 arranged from top to bottom. The water pump 150 is connected to the water storage device 140, and the water pump 150 is connected to the spraying device 130. The water pump 150 is used to pump the water in the water storage device 140 to the spraying device 130 and provide the power for spraying water to the spraying device 130. That is, under the action of the water pump 150, the spraying device 130 sprays water on the heat exchanger 110. When the heat exchanger 110 outputs cold, the water sprayed on the heat exchanger 110 can freeze into ice, so as to achieve the purpose of freezing the scale on the heat exchanger 110 into one body; when the heat exchanger 110 outputs heat, the water sprayed on the heat exchanger 110 can prompt the melted and fallen ice flakes to fall into the water storage device 140, so as to achieve the purpose of removing the scale of the heat exchanger 110.

[0068] It should be noted that in some embodiments of the present application, the evaporative cooling unit 100 may further include an evaporative cooling heat exchange device (not shown in the figure). One end of the evaporative cooling heat exchange device is connected to the water pump 150, and the other end is connected to the spraying device 130. When the water in the water storage device 140 is pumped out by the water pump 150, the water can enter the evaporative cooling heat exchange device, so that the evaporative cooling heat exchange device can output cold or heat to the outside, and then guide the water to the spraying device 130 so that the water can be sprayed on the heat exchanger 110.

[0069] Optionally, in the embodiments of the present application, the evaporative cooling unit 100 may further include a water replenishing channel 141 and a sewage discharging channel 142. The water replenishing channel 141 is connected to the water storage device 140 and is used to replenish water to the water storage device 140. The sewage discharging channel 142 is connected to the bottom of the water storage device 140 and is used for sewage discharge of the water storage device 140. After the ice flakes of the ice forming mechanism fall into the water storage device 140, the ice flakes melt, causing the dirt to sink to the bottom of the water storage device 140. At this time, the dirt can be discharged through the sewage discharging channel 142.

[0070] In addition, the evaporative cooling unit 100 may further include a conductivity tester 143. The conductivity tester 143 is disposed inside the water storage device 140 and is used to detect the conductivity of the liquid in the water storage device 140.

[0071] Furthermore, in the embodiments of the present application, the evaporative cooling heat exchanger assembly 10 may further include a gas-liquid separator 250. The gas-liquid separator 250 is disposed between the refrigerant inlet end 212 of the compressor 210 and the four-way valve 260, so that the refrigerant can separate the gaseous refrigerant and the liquid refrigerant after passing through the gas-liquid separator 250, and store the liquid refrigerant in the gas-liquid separator 250 to prevent the liquid separator from entering the compressor 210 and causing a failure of the compressor 210.

[0072] Please refer to Figure 3 , in order to improve the descaling efficiency of the heat exchanger 110 in the evaporative cooling unit 100, a descaling method is also provided in the embodiments of the present application. The descaling method includes:

[0073] Step S1, receiving a first evaporation pressure value and a second evaporation pressure value.

[0074] Wherein, the first evaporation pressure value represents the average evaporation pressure of the refrigerant in the heat exchanger 110 in the first preset period. The second evaporation pressure value represents the average evaporation pressure of the refrigerant in the heat exchanger 110 in the second preset period. Moreover, the first preset period and the second preset period are adjacent, and the first preset period is before the second preset period; in other words, after the evaporative cooling heat exchanger assembly 10 operates in the first preset period, the evaporative cooling heat exchanger assembly 10 then enters the second preset period and starts to operate.

[0075] It should be noted that when the surface of the heat exchanger 110 starts to freeze, since the ice layer will output a certain amount of cold outside itself and the ice layer will block the heat exchanger 110 from outputting cold outside, at this time, it will affect the evaporation pressure of the refrigerant inside the heat exchanger 110. Therefore, the icing condition outside the heat exchanger 110 can be judged by detecting the evaporation pressure inside the heat exchanger 110 to facilitate the control of the spraying amount of the spraying device 130.

[0076] Optionally, to ensure that the conditions for calculating the first evaporation pressure value and the second evaporation pressure value are the same, so as to eliminate the error caused by different times in the comparison between the first evaporation pressure value and the second evaporation pressure value, in some embodiments of the present application, the time length of the first preset period is equal to the time length of the second preset period.

[0077] Step S2: Control the spraying device 130 to switch the spraying gear according to the first evaporation pressure value and the second evaporation pressure value.

[0078] It should be noted that by switching the spraying gear of the spraying device 130, the purpose of adjusting the spraying amount of the spraying device 130 can be achieved.

[0079] Optionally, please refer to Figure 4 , step S2 may include:

[0080] Step S21: Calculate the difference between the first evaporation pressure value and the second evaporation pressure value to obtain an evaporation pressure difference.

[0081] Step S22: Control the spraying device 130 to switch the spraying gear according to the evaporation pressure difference.

[0082] Optionally, please refer to Figure 5 , step S22 may include:

[0083] Step S221: When the evaporation pressure difference is less than the first preset value, control the spraying device 130 to switch to the stop gear.

[0084] Wherein, when the spraying device 130 switches to the stop gear, the spraying device 130 stops spraying.

[0085] Step S222: When the evaporation pressure difference is greater than or equal to the first preset value and less than the second preset value, control the spraying device 130 to switch to the first gear.

[0086] Step S223: When the evaporation pressure difference is greater than or equal to the second preset value and less than the third preset value, control the spraying device 130 to switch to the second gear.

[0087] Step S224: When the evaporation pressure difference is greater than or equal to the third preset value and less than the fourth preset value, control the spraying device 130 to switch to the third gear.

[0088] Step S225: When the evaporation pressure difference is greater than or equal to the fourth preset value, control the spraying device 130 to switch to the fourth gear.

[0089] It should be noted that the spraying amounts corresponding to the first gear, the second gear, the third gear, and the fourth gear increase in sequence.

[0090] Additionally, optionally, in some embodiments of the present application, the value of the first preset value is -0.4, the value of the second preset value is -0.2, the value of the third preset value is 0.2, and the value of the fourth preset value is 0.4. Of course, in other embodiments, the first preset value, the second preset value, the third preset value, and the fourth preset value can also be set to other values. For example, the value range of the first preset value can be from -0.5 to -0.3 and does not include -0.3. In other words, the first preset value can also be -0.45, -0.5, or -0.35, etc.; for another example, the value range of the second preset value can be from -0.3 to -0.1 and does not include -0.1. In other words, the second preset value can also be -0.3, -0.25, -0.15, etc.; for yet another example, the value range of the third preset value can be from -0.1 to 0.3 and does not include 0.3. In other words, the value of the third preset value can be -0.1, -0.05, 0, 0.05, 0.1, 0.15, or 0.25, etc.; for still another example, the value range of the fourth preset value can be from 0.3 to 0.5. In other words, the value of the fourth preset value can be 0.3, 0.35, 0.45, or 0.5, etc.

[0091] It should be noted that there is no fixed order among step S221, step S222, step S223, step S224, and step S225. Just execute the corresponding step when the evaporation pressure difference satisfies a certain situation.

[0092] In summary, the descaling method can control the switching of the spraying gear of the spraying device 130 by detecting the evaporation pressure of the refrigerant in the heat exchanger 110, so as to adjust the spraying amount of the spraying device 130, enabling an ice layer to be quickly formed on the heat exchanger 110, thereby quickly and efficiently achieving the purpose of descaling the heat exchanger 110.

[0093] In addition, an embodiment of the present application also provides a refrigeration system (not shown in the figure). This refrigeration system adopts the evaporative cooling heat exchanger assembly 10 in the above-mentioned embodiment, and this refrigeration system can achieve the purpose of efficiently and quickly descaling the heat exchanger 110.

[0094] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A descaling method applied to an evaporative cooling heat exchanger assembly. The evaporative cooling heat exchanger assembly includes an evaporative cooling unit, and the evaporative cooling unit includes a spraying device and a heat exchanger. The spraying device is used to spray water towards the heat exchanger, and the heat exchanger is used to receive a refrigerant and output cold or heat. It is characterized in that: The method includes: Providing a low-temperature refrigerant to the heat exchanger of the evaporative cooling unit, and when the spraying device sprays water on the heat exchanger, an ice layer can be formed on the surface of the heat exchanger, so that the scale on the surface of the heat exchanger can be frozen into one body; when the ice layer on the heat exchanger reaches a certain degree, providing a high-temperature refrigerant to the heat exchanger, so that a part of the ice layer attached to the heat exchanger melts, so as to realize the separation of the ice layer from the heat exchanger; when the ice layer separates from the heat exchanger, the ice layer separates the scale frozen into one body from the heat exchanger together, so as to descale the heat exchanger; Receiving a first evaporation pressure value and a second evaporation pressure value. The first evaporation pressure value represents the average evaporation pressure of the refrigerant in the heat exchanger in a first preset period, and the second evaporation pressure value represents the average evaporation pressure of the refrigerant in the heat exchanger in a second preset period. The first preset period and the second preset period are adjacent and the second preset period is before the first preset period; Controlling the spraying device to switch the spraying gear according to the first evaporation pressure value and the second evaporation pressure value, so as to adjust the spraying amount of the spraying device; The step of controlling the spraying device to switch the spraying gear according to the first evaporation pressure value and the second evaporation pressure value includes: Calculating the difference between the first evaporation pressure value minus the second evaporation pressure value to obtain an evaporation pressure difference; Controlling the spraying device to switch the spraying gear according to the evaporation pressure difference.

2. The descaling method according to claim 1, characterized in that, The step of controlling the spraying device to switch the spraying gear according to the evaporation pressure difference includes: When the evaporation pressure difference is less than a first preset value, controlling the spraying device to switch to a stop gear so that the spraying device stops; When the evaporation pressure difference is greater than or equal to the first preset value and less than a second preset value, controlling the spraying device to switch to the first gear; When the evaporation pressure difference is greater than or equal to the second preset value and less than a third preset value, controlling the spraying device to switch to the second gear; When the evaporation pressure difference is greater than or equal to the third preset value and less than a fourth preset value, controlling the spraying device to switch to the third gear; When the evaporation pressure difference is greater than or equal to the fourth preset value, controlling the spraying device to switch to the fourth gear; The spraying amounts corresponding to the first gear, the second gear, the third gear, and the fourth gear increase in sequence.

3. The descaling method according to claim 1, characterized in that, The time length of the first preset period is equal to the time length of the second preset period.

4. An evaporative cooling heat exchanger assembly, characterized in that, Including an evaporative cooling unit, a descaling system, an evaporation pressure detection device, and a controller; The descaling system includes a compressor, a four-way valve, an evaporator, a guiding channel, and a throttling channel; The refrigerant outlet end and the refrigerant inlet end of the compressor are respectively connected to the four-way valve; The evaporative cooling unit has a heat exchanger for cooling water, and one end of the heat exchanger is connected to the four-way valve; The evaporator is used to output cooling capacity or heat, and one end is connected to the four-way valve; The guiding channel has a first interface, a second interface and two third interfaces. The first interface is connected to the other end of the heat exchanger, and the second interface is connected to the other end of the evaporator; The throttling channel is used to throttle and depressurize the refrigerant, and has a liquid inlet end and a liquid outlet end. The liquid inlet end and the liquid outlet end are respectively connected to the two third interfaces; When the guiding channel imports the refrigerant at the first interface or the second interface, the guiding channel exports the refrigerant from the third interface connected to the liquid inlet end; The evaporation pressure detection device is arranged inside the heat exchanger, and is used to detect the evaporation pressure of the refrigerant inside the heat exchanger and issue the first evaporation pressure value or the second evaporation pressure value; The controller is electrically connected to the evaporation pressure detection device and is used to receive the first evaporation pressure value and the second evaporation pressure value. The spraying device is electrically connected to the controller, and the controller can execute the descaling method according to any one of claims 1-3.

5. The evaporative cooling heat exchanger assembly according to claim 4, wherein, The guiding channel includes a first one-way channel, a second one-way channel, a third one-way channel and a fourth one-way channel; One end of the first one-way channel is connected to one end of the second one-way channel to form the first interface. The first one-way channel conducts fluid towards the first interface and is unidirectionally conductive; The other end of the first one-way channel is connected to one end of the fourth one-way channel to form the third interface and is connected to the liquid outlet end; One end of the third one-way channel is connected to the other end of the fourth one-way channel to form the second interface. The fourth one-way channel conducts fluid towards the second interface and is unidirectionally conductive; The other end of the third one-way channel is connected to the other end of the second one-way channel to form the third interface and is connected to the liquid inlet end. Both the third one-way channel and the second one-way channel conduct fluid towards the liquid inlet end and are both unidirectionally conductive.

6. The evaporative cooling heat exchanger assembly according to claim 4, wherein, An expansion valve and a drying filter are arranged on the throttling channel. The drying filter is arranged close to the liquid inlet end, and the expansion valve is arranged close to the liquid outlet end.

7. The evaporative cooling heat exchanger assembly according to claim 6, wherein A liquid storage device is further arranged on the throttling channel. The liquid storage device is arranged between the drying filter and the liquid inlet end, so that when the refrigerant enters the throttling channel from the liquid inlet end, it can flow through the liquid storage device, the drying filter and the expansion valve in sequence.

8. The evaporative cooling heat exchanger assembly according to claim 4, wherein, The evaporative cooling unit includes a water pump and a blower, a spraying device, the heat exchanger and a water storage device arranged from top to bottom; The water pump is connected to the water storage device, and the water pump is connected to the spraying device. The water pump is used to pump the water in the water storage device to the spraying device and provide the power for the spraying device to spray water.

9. The evaporative cooling heat exchanger assembly according to claim 8, characterized in that, The evaporative cooling unit further includes a water replenishing channel and a sewage discharging channel. The water replenishing channel is connected to the water storage device and is used to replenish water to the water storage device. The sewage discharging channel is connected to the bottom of the water storage device and is used for discharging sewage from the water storage device.

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